Update vendors

vendor/github.com/cosiner/argv/LICENSE

@@ -0,0 +1,24 @@
+The MIT License (MIT)
+
+Copyright (c) 2017 aihui zhu
+
+Permission is hereby granted, free of charge, to any person
+obtaining a copy of this software and associated documentation
+files (the "Software"), to deal in the Software without
+restriction, including without limitation the rights to use,
+copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.

vendor/github.com/cosiner/argv/argv.go

@@ -0,0 +1,34 @@
+// Package argv parse command line string into arguments array using the bash syntax.
+package argv
+
+import "strings"
+
+// ParseEnv parsing environment variables as key/value pair.
+//
+// Item will be ignored if one of the key and value is empty.
+func ParseEnv(env []string) map[string]string {
+	var m map[string]string
+	for _, e := range env {
+		secs := strings.SplitN(e, "=", 2)
+		if len(secs) == 2 {
+			key := strings.TrimSpace(secs[0])
+			val := strings.TrimSpace(secs[1])
+			if key == "" || val == "" {
+				continue
+			}
+			if m == nil {
+				m = make(map[string]string)
+			}
+			m[key] = val
+		}
+	}
+	return m
+}
+
+// Argv split cmdline string as array of argument array by the '|' character.
+//
+// The parsing rules is same as bash. The environment variable will be replaced
+// and string surround by '`' will be passed to reverse quote parser.
+func Argv(cmdline []rune, env map[string]string, reverseQuoteParser ReverseQuoteParser) ([][]string, error) {
+	return NewParser(NewScanner(cmdline, env), reverseQuoteParser).Parse()
+}

vendor/github.com/cosiner/argv/cmd.go

@@ -0,0 +1,79 @@
+package argv
+
+import (
+	"bytes"
+	"errors"
+	"io"
+	"os/exec"
+	"strings"
+)
+
+// Run execute cmdline string and return the output
+func Run(cmdline []rune, env map[string]string) ([]rune, error) {
+	args, err := Argv(cmdline, env, Run)
+	if err != nil {
+		return nil, err
+	}
+	cmds, err := Cmds(args)
+	if err != nil {
+		return nil, err
+	}
+
+	output := bytes.NewBuffer(make([]byte, 0, 1024))
+	err = Pipe(nil, output, cmds...)
+	str := output.String()
+	str = strings.TrimSpace(str)
+	return []rune(str), err
+}
+
+// Cmds generate exec.Cmd for each command.
+func Cmds(args [][]string) ([]*exec.Cmd, error) {
+	var cmds []*exec.Cmd
+	for _, argv := range args {
+		if len(argv) == 0 {
+			return nil, errors.New("invalid cmd")
+		}
+
+		cmds = append(cmds, exec.Command(argv[0], argv[1:]...))
+	}
+	return cmds, nil
+}
+
+// Pipe pipe previous command's stdout to next command's stdin, if in or
+// out is nil, it will be ignored.
+func Pipe(in io.Reader, out io.Writer, cmds ...*exec.Cmd) error {
+	l := len(cmds)
+	if l == 0 {
+		return nil
+	}
+
+	var err error
+	for i := 1; i < l; i++ {
+		cmds[i].Stdin, err = cmds[i-1].StdoutPipe()
+		if err != nil {
+			break
+		}
+	}
+	if err != nil {
+		return err
+	}
+	if in != nil {
+		cmds[0].Stdin = in
+	}
+	if out != nil {
+		cmds[l-1].Stdout = out
+	}
+	for i := range cmds {
+		err = cmds[i].Start()
+		if err != nil {
+			return err
+		}
+	}
+	for i := range cmds {
+		err = cmds[i].Wait()
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}

vendor/github.com/cosiner/argv/parser.go

@@ -0,0 +1,222 @@
+package argv
+
+import "errors"
+
+type (
+	// ReverseQuoteParser parse strings quoted by '`' and return it's result. Commonly,
+	// it should run it os command.
+	ReverseQuoteParser func([]rune, map[string]string) ([]rune, error)
+
+	// Parser take tokens from Scanner, and do syntax checking, and generate the splitted arguments array.
+	Parser struct {
+		s      *Scanner
+		tokbuf []Token
+		r      ReverseQuoteParser
+
+		sections    [][]string
+		currSection []string
+
+		currStrValid bool
+		currStr      []rune
+	}
+)
+
+// NewParser create a cmdline string parser.
+func NewParser(s *Scanner, r ReverseQuoteParser) *Parser {
+	if r == nil {
+		r = func(r []rune, env map[string]string) ([]rune, error) {
+			return r, nil
+		}
+	}
+
+	return &Parser{
+		s: s,
+		r: r,
+	}
+}
+
+func (p *Parser) nextToken() (Token, error) {
+	if l := len(p.tokbuf); l > 0 {
+		tok := p.tokbuf[l-1]
+		p.tokbuf = p.tokbuf[:l-1]
+		return tok, nil
+	}
+
+	return p.s.Next()
+}
+
+var (
+	// ErrInvalidSyntax was reported if there is a syntax error in command line string.
+	ErrInvalidSyntax = errors.New("invalid syntax")
+)
+
+func (p *Parser) unreadToken(tok Token) {
+	p.tokbuf = append(p.tokbuf, tok)
+}
+
+// Parse split command line string into arguments array.
+//
+// EBNF:
+//   Cmdline = Section [ Pipe Cmdline ]
+//   Section = [Space] SpacedSection { SpacedSection }
+//   SpacedSection = MultipleUnit [Space]
+//   MultipleUnit = Unit {Unit}
+//   Unit = String | ReverseQuote
+func (p *Parser) Parse() ([][]string, error) {
+	err := p.cmdline()
+	if err != nil {
+		return nil, err
+	}
+	return p.sections, nil
+}
+
+func (p *Parser) cmdline() error {
+	err := p.section()
+	if err != nil {
+		return err
+	}
+	p.endSection()
+
+	tok, err := p.nextToken()
+	if err != nil {
+		return err
+	}
+	if tok.Type == TokEOF {
+		return nil
+	}
+	if !p.accept(tok.Type, TokPipe) {
+		return ErrInvalidSyntax
+	}
+	return p.cmdline()
+}
+
+func (p *Parser) section() error {
+	leftSpace, err := p.optional(TokSpace)
+	if err != nil {
+		return err
+	}
+
+	var isFirst = true
+	for {
+		unit, err := p.spacedSection()
+		if isFirst {
+			isFirst = false
+		} else {
+			if err == ErrInvalidSyntax {
+				break
+			}
+		}
+		if err != nil {
+			return err
+		}
+
+		p.appendUnit(leftSpace, unit)
+		leftSpace = unit.rightSpace
+	}
+	return nil
+}
+
+type unit struct {
+	rightSpace bool
+	toks       []Token
+}
+
+func (p *Parser) spacedSection() (u unit, err error) {
+	u.toks, err = p.multipleUnit()
+	if err != nil {
+		return
+	}
+	u.rightSpace, err = p.optional(TokSpace)
+	return
+}
+
+func (p *Parser) multipleUnit() ([]Token, error) {
+	var (
+		toks    []Token
+		isFirst = true
+	)
+	for {
+		tok, err := p.unit()
+		if isFirst {
+			isFirst = false
+		} else {
+			if err == ErrInvalidSyntax {
+				break
+			}
+		}
+		if err != nil {
+			return nil, err
+		}
+		toks = append(toks, tok)
+	}
+	return toks, nil
+}
+
+func (p *Parser) unit() (Token, error) {
+	tok, err := p.nextToken()
+	if err != nil {
+		return tok, err
+	}
+	if p.accept(tok.Type, TokString, TokReversequote) {
+		return tok, nil
+	}
+	p.unreadToken(tok)
+	return tok, ErrInvalidSyntax
+}
+
+func (p *Parser) optional(typ TokenType) (bool, error) {
+	tok, err := p.nextToken()
+	if err != nil {
+		return false, err
+	}
+	var ok bool
+	if ok = p.accept(tok.Type, typ); !ok {
+		p.unreadToken(tok)
+	}
+	return ok, nil
+}
+
+func (p *Parser) accept(t TokenType, types ...TokenType) bool {
+	for _, typ := range types {
+		if t == typ {
+			return true
+		}
+	}
+	return false
+}
+
+func (p *Parser) appendUnit(leftSpace bool, u unit) error {
+	if leftSpace {
+		p.currStr = p.currStr[:0]
+	}
+	for _, tok := range u.toks {
+		if tok.Type == TokReversequote {
+			val, err := p.r(tok.Value, p.s.envs())
+			if err != nil {
+				return err
+			}
+			p.currStr = append(p.currStr, val...)
+		} else {
+			p.currStr = append(p.currStr, tok.Value...)
+		}
+	}
+	p.currStrValid = true
+	if u.rightSpace {
+		p.currSection = append(p.currSection, string(p.currStr))
+		p.currStr = p.currStr[:0]
+		p.currStrValid = false
+	}
+	return nil
+}
+
+func (p *Parser) endSection() {
+	if p.currStrValid {
+		p.currSection = append(p.currSection, string(p.currStr))
+	}
+	p.currStr = p.currStr[:0]
+	p.currStrValid = false
+	if len(p.currSection) > 0 {
+		p.sections = append(p.sections, p.currSection)
+		p.currSection = nil
+	}
+}

vendor/github.com/cosiner/argv/scanner.go

@@ -0,0 +1,282 @@
+package argv
+
+import "unicode"
+
+// Scanner is a cmdline string scanner.
+//
+// It split cmdline string to tokens: space, string, pipe, reverse quote string.
+type Scanner struct {
+	env map[string]string
+
+	text      []rune
+	rpos      int
+	dollarBuf []rune
+}
+
+// NewScanner create a scanner and init it's internal states.
+func NewScanner(text []rune, env map[string]string) *Scanner {
+	return &Scanner{
+		text: text,
+		env:  env,
+	}
+}
+
+func (s *Scanner) envs() map[string]string {
+	return s.env
+}
+
+const _RuneEOF = 0
+
+func (s *Scanner) nextRune() rune {
+	if s.rpos >= len(s.text) {
+		return _RuneEOF
+	}
+
+	r := s.text[s.rpos]
+	s.rpos++
+	return r
+}
+
+func (s *Scanner) unreadRune(r rune) {
+	if r != _RuneEOF {
+		s.rpos--
+	}
+}
+
+func (s *Scanner) isEscapeChars(r rune) (rune, bool) {
+	switch r {
+	case 'a':
+		return '\a', true
+	case 'b':
+		return '\b', true
+	case 'f':
+		return '\f', true
+	case 'n':
+		return '\n', true
+	case 'r':
+		return '\r', true
+	case 't':
+		return '\t', true
+	case 'v':
+		return '\v', true
+	case '\\':
+		return '\\', true
+	case '$':
+		return '$', true
+	}
+	return r, false
+}
+
+func (s *Scanner) endEnv(r rune) bool {
+	if r == '_' || (r >= 'a' && r <= 'z') || (r >= 'A' && r <= 'Z') || (r >= '0' && r <= '9') {
+		return false
+	}
+	return true
+}
+
+// TokenType is the type of tokens recognized by the scanner.
+type TokenType uint32
+
+// Token is generated by the scanner with a type and value.
+type Token struct {
+	Type  TokenType
+	Value []rune
+}
+
+const (
+	// TokString for string, single quoted string and double quoted string
+	TokString TokenType = iota + 1
+	// TokPipe is the '|' character
+	TokPipe
+	// TokReversequote is reverse quoted string
+	TokReversequote
+	// TokSpace represent space character sequence
+	TokSpace
+	// TokEOF means the input end.
+	TokEOF
+)
+
+func (s *Scanner) getEnv(name string) string {
+	return s.env[name]
+}
+
+func (s *Scanner) specialVar(r rune) (string, bool) {
+	switch r {
+	case '0', '*', '#', '@', '?', '$':
+		v, has := s.env[string(r)]
+		return v, has
+	default:
+		return "", false
+	}
+}
+
+func (s *Scanner) checkDollarStart(tok *Token, r rune, from, switchTo uint8) uint8 {
+	state := from
+	nr := s.nextRune()
+	if val, has := s.specialVar(nr); has {
+		if val != "" {
+			tok.Value = append(tok.Value, []rune(val)...)
+		}
+	} else if s.endEnv(nr) {
+		tok.Value = append(tok.Value, r)
+		s.unreadRune(nr)
+	} else {
+		state = switchTo
+		s.dollarBuf = append(s.dollarBuf[:0], nr)
+	}
+	return state
+}
+
+func (s *Scanner) checkDollarEnd(tok *Token, r rune, from, switchTo uint8) uint8 {
+	var state = from
+	if s.endEnv(r) {
+		tok.Value = append(tok.Value, []rune(s.getEnv(string(s.dollarBuf)))...)
+		state = switchTo
+		s.unreadRune(r)
+	} else {
+		s.dollarBuf = append(s.dollarBuf, r)
+	}
+	return state
+}
+
+// Next return next token, if it reach the end, TOK_EOF will be returned.
+//
+// Error is returned for invalid syntax such as unpaired quotes.
+func (s *Scanner) Next() (Token, error) {
+	const (
+		Initial = iota + 1
+		Space
+		ReverseQuote
+		String
+		StringDollar
+		StringQuoteSingle
+		StringQuoteDouble
+		StringQuoteDoubleDollar
+	)
+
+	var (
+		tok Token
+
+		state uint8 = Initial
+	)
+	s.dollarBuf = s.dollarBuf[:0]
+	for {
+		r := s.nextRune()
+		switch state {
+		case Initial:
+			switch {
+			case r == _RuneEOF:
+				tok.Type = TokEOF
+				return tok, nil
+			case r == '|':
+				tok.Type = TokPipe
+				return tok, nil
+			case r == '`':
+				state = ReverseQuote
+			case unicode.IsSpace(r):
+				state = Space
+				s.unreadRune(r)
+			default:
+				state = String
+				s.unreadRune(r)
+			}
+		case Space:
+			if r == _RuneEOF || !unicode.IsSpace(r) {
+				s.unreadRune(r)
+				tok.Type = TokSpace
+				return tok, nil
+			}
+		case ReverseQuote:
+			switch r {
+			case _RuneEOF:
+				return tok, ErrInvalidSyntax
+			case '`':
+				tok.Type = TokReversequote
+				return tok, nil
+			default:
+				tok.Value = append(tok.Value, r)
+			}
+		case String:
+			switch {
+			case r == _RuneEOF || r == '|' || r == '`' || unicode.IsSpace(r):
+				tok.Type = TokString
+				s.unreadRune(r)
+				return tok, nil
+			case r == '\'':
+				state = StringQuoteSingle
+			case r == '"':
+				state = StringQuoteDouble
+			case r == '\\':
+				nr := s.nextRune()
+				if nr == _RuneEOF {
+					return tok, ErrInvalidSyntax
+				}
+				tok.Value = append(tok.Value, nr)
+			case r == '$':
+				state = s.checkDollarStart(&tok, r, state, StringDollar)
+			default:
+				tok.Value = append(tok.Value, r)
+			}
+		case StringDollar:
+			state = s.checkDollarEnd(&tok, r, state, String)
+		case StringQuoteSingle:
+			switch r {
+			case _RuneEOF:
+				return tok, ErrInvalidSyntax
+			case '\'':
+				state = String
+			case '\\':
+				nr := s.nextRune()
+				if escape, ok := s.isEscapeChars(nr); ok {
+					tok.Value = append(tok.Value, escape)
+				} else {
+					tok.Value = append(tok.Value, r)
+					s.unreadRune(nr)
+				}
+			default:
+				tok.Value = append(tok.Value, r)
+			}
+		case StringQuoteDouble:
+			switch r {
+			case _RuneEOF:
+				return tok, ErrInvalidSyntax
+			case '"':
+				state = String
+			case '\\':
+				nr := s.nextRune()
+				if nr == _RuneEOF {
+					return tok, ErrInvalidSyntax
+				}
+				if escape, ok := s.isEscapeChars(nr); ok {
+					tok.Value = append(tok.Value, escape)
+				} else {
+					tok.Value = append(tok.Value, r)
+					s.unreadRune(nr)
+				}
+			case '$':
+				state = s.checkDollarStart(&tok, r, state, StringQuoteDoubleDollar)
+			default:
+				tok.Value = append(tok.Value, r)
+			}
+		case StringQuoteDoubleDollar:
+			state = s.checkDollarEnd(&tok, r, state, StringQuoteDouble)
+		}
+	}
+}
+
+// Scan is a utility function help split input text as tokens.
+func Scan(text []rune, env map[string]string) ([]Token, error) {
+	s := NewScanner(text, env)
+	var tokens []Token
+	for {
+		tok, err := s.Next()
+		if err != nil {
+			return nil, err
+		}
+		tokens = append(tokens, tok)
+		if tok.Type == TokEOF {
+			break
+		}
+	}
+	return tokens, nil
+}

vendor/github.com/derekparker/delve/dwarf/line/line_parser.go

@@ -1,122 +0,0 @@
-package line
-
-import (
-	"bytes"
-	"encoding/binary"
-
-	"github.com/derekparker/delve/dwarf/util"
-)
-
-type DebugLinePrologue struct {
-	UnitLength     uint32
-	Version        uint16
-	Length         uint32
-	MinInstrLength uint8
-	InitialIsStmt  uint8
-	LineBase       int8
-	LineRange      uint8
-	OpcodeBase     uint8
-	StdOpLengths   []uint8
-}
-
-type DebugLineInfo struct {
-	Prologue     *DebugLinePrologue
-	IncludeDirs  []string
-	FileNames    []*FileEntry
-	Instructions []byte
-	Lookup       map[string]*FileEntry
-}
-
-type FileEntry struct {
-	Name        string
-	DirIdx      uint64
-	LastModTime uint64
-	Length      uint64
-}
-
-type DebugLines []*DebugLineInfo
-
-func (d *DebugLines) GetLineInfo(name string) *DebugLineInfo {
-	// Find in which table file exists and return it.
-	for _, l := range *d {
-		if _, ok := l.Lookup[name]; ok {
-			return l
-		}
-	}
-	return nil
-}
-
-func Parse(data []byte) DebugLines {
-	var (
-		lines = make(DebugLines, 0)
-		buf   = bytes.NewBuffer(data)
-	)
-
-	// We have to parse multiple file name tables here.
-	for buf.Len() > 0 {
-		dbl := new(DebugLineInfo)
-		dbl.Lookup = make(map[string]*FileEntry)
-
-		parseDebugLinePrologue(dbl, buf)
-		parseIncludeDirs(dbl, buf)
-		parseFileEntries(dbl, buf)
-
-		// Instructions size calculation breakdown:
-		//   - dbl.Prologue.UnitLength is the length of the entire unit, not including the 4 bytes to represent that length.
-		//   - dbl.Prologue.Length is the length of the prologue not including unit length, version or prologue length itself.
-		//   - So you have UnitLength - PrologueLength - (version_length_bytes(2) + prologue_length_bytes(4)).
-		dbl.Instructions = buf.Next(int(dbl.Prologue.UnitLength - dbl.Prologue.Length - 6))
-
-		lines = append(lines, dbl)
-	}
-
-	return lines
-}
-
-func parseDebugLinePrologue(dbl *DebugLineInfo, buf *bytes.Buffer) {
-	p := new(DebugLinePrologue)
-
-	p.UnitLength = binary.LittleEndian.Uint32(buf.Next(4))
-	p.Version = binary.LittleEndian.Uint16(buf.Next(2))
-	p.Length = binary.LittleEndian.Uint32(buf.Next(4))
-	p.MinInstrLength = uint8(buf.Next(1)[0])
-	p.InitialIsStmt = uint8(buf.Next(1)[0])
-	p.LineBase = int8(buf.Next(1)[0])
-	p.LineRange = uint8(buf.Next(1)[0])
-	p.OpcodeBase = uint8(buf.Next(1)[0])
-
-	p.StdOpLengths = make([]uint8, p.OpcodeBase-1)
-	binary.Read(buf, binary.LittleEndian, &p.StdOpLengths)
-
-	dbl.Prologue = p
-}
-
-func parseIncludeDirs(info *DebugLineInfo, buf *bytes.Buffer) {
-	for {
-		str, _ := util.ParseString(buf)
-		if str == "" {
-			break
-		}
-
-		info.IncludeDirs = append(info.IncludeDirs, str)
-	}
-}
-
-func parseFileEntries(info *DebugLineInfo, buf *bytes.Buffer) {
-	for {
-		entry := new(FileEntry)
-
-		name, _ := util.ParseString(buf)
-		if name == "" {
-			break
-		}
-
-		entry.Name = name
-		entry.DirIdx, _ = util.DecodeULEB128(buf)
-		entry.LastModTime, _ = util.DecodeULEB128(buf)
-		entry.Length, _ = util.DecodeULEB128(buf)
-
-		info.FileNames = append(info.FileNames, entry)
-		info.Lookup[name] = entry
-	}
-}

vendor/github.com/derekparker/delve/dwarf/line/state_machine.go

@@ -1,252 +0,0 @@
-package line
-
-import (
-	"bytes"
-	"encoding/binary"
-	"errors"
-	"fmt"
-
-	"github.com/derekparker/delve/dwarf/util"
-)
-
-type Location struct {
-	File    string
-	Line    int
-	Address uint64
-	Delta   int
-}
-
-type StateMachine struct {
-	dbl             *DebugLineInfo
-	file            string
-	line            int
-	address         uint64
-	column          uint
-	isStmt          bool
-	basicBlock      bool
-	endSeq          bool
-	lastWasStandard bool
-	lastDelta       int
-}
-
-type opcodefn func(*StateMachine, *bytes.Buffer)
-
-// Special opcodes
-const (
-	DW_LNS_copy             = 1
-	DW_LNS_advance_pc       = 2
-	DW_LNS_advance_line     = 3
-	DW_LNS_set_file         = 4
-	DW_LNS_set_column       = 5
-	DW_LNS_negate_stmt      = 6
-	DW_LNS_set_basic_block  = 7
-	DW_LNS_const_add_pc     = 8
-	DW_LNS_fixed_advance_pc = 9
-)
-
-// Extended opcodes
-const (
-	DW_LINE_end_sequence = 1
-	DW_LINE_set_address  = 2
-	DW_LINE_define_file  = 3
-)
-
-var standardopcodes = map[byte]opcodefn{
-	DW_LNS_copy:             copyfn,
-	DW_LNS_advance_pc:       advancepc,
-	DW_LNS_advance_line:     advanceline,
-	DW_LNS_set_file:         setfile,
-	DW_LNS_set_column:       setcolumn,
-	DW_LNS_negate_stmt:      negatestmt,
-	DW_LNS_set_basic_block:  setbasicblock,
-	DW_LNS_const_add_pc:     constaddpc,
-	DW_LNS_fixed_advance_pc: fixedadvancepc,
-}
-
-var extendedopcodes = map[byte]opcodefn{
-	DW_LINE_end_sequence: endsequence,
-	DW_LINE_set_address:  setaddress,
-	DW_LINE_define_file:  definefile,
-}
-
-func newStateMachine(dbl *DebugLineInfo) *StateMachine {
-	return &StateMachine{dbl: dbl, file: dbl.FileNames[0].Name, line: 1}
-}
-
-// Returns all PCs for a given file/line. Useful for loops where the 'for' line
-// could be split amongst 2 PCs.
-func (dbl *DebugLines) AllPCsForFileLine(f string, l int) (pcs []uint64) {
-	var (
-		foundFile bool
-		lastAddr  uint64
-		lineInfo  = dbl.GetLineInfo(f)
-		sm        = newStateMachine(lineInfo)
-		buf       = bytes.NewBuffer(lineInfo.Instructions)
-	)
-
-	for b, err := buf.ReadByte(); err == nil; b, err = buf.ReadByte() {
-		findAndExecOpcode(sm, buf, b)
-		if foundFile && sm.file != f {
-			return
-		}
-		if sm.line == l && sm.file == f && sm.address != lastAddr {
-			foundFile = true
-			pcs = append(pcs, sm.address)
-			line := sm.line
-			// Keep going until we're on a different line. We only care about
-			// when a line comes back around (i.e. for loop) so get to next line,
-			// and try to find the line we care about again.
-			for b, err := buf.ReadByte(); err == nil; b, err = buf.ReadByte() {
-				findAndExecOpcode(sm, buf, b)
-				if line < sm.line {
-					break
-				}
-			}
-		}
-	}
-	return
-}
-
-var NoSourceError = errors.New("no source available")
-
-func (dbl *DebugLines) AllPCsBetween(begin, end uint64, filename string) ([]uint64, error) {
-	lineInfo := dbl.GetLineInfo(filename)
-	if lineInfo == nil {
-		return nil, NoSourceError
-	}
-	var (
-		pcs      []uint64
-		lastaddr uint64
-		sm       = newStateMachine(lineInfo)
-		buf      = bytes.NewBuffer(lineInfo.Instructions)
-	)
-
-	for b, err := buf.ReadByte(); err == nil; b, err = buf.ReadByte() {
-		findAndExecOpcode(sm, buf, b)
-		if sm.address > end {
-			break
-		}
-		if sm.address >= begin && sm.address > lastaddr {
-			lastaddr = sm.address
-			pcs = append(pcs, sm.address)
-		}
-	}
-	return pcs, nil
-}
-
-func findAndExecOpcode(sm *StateMachine, buf *bytes.Buffer, b byte) {
-	switch {
-	case b == 0:
-		execExtendedOpcode(sm, b, buf)
-	case b < sm.dbl.Prologue.OpcodeBase:
-		execStandardOpcode(sm, b, buf)
-	default:
-		execSpecialOpcode(sm, b)
-	}
-}
-
-func execSpecialOpcode(sm *StateMachine, instr byte) {
-	var (
-		opcode  = uint8(instr)
-		decoded = opcode - sm.dbl.Prologue.OpcodeBase
-	)
-
-	if sm.dbl.Prologue.InitialIsStmt == uint8(1) {
-		sm.isStmt = true
-	}
-
-	sm.lastDelta = int(sm.dbl.Prologue.LineBase + int8(decoded%sm.dbl.Prologue.LineRange))
-	sm.line += sm.lastDelta
-	sm.address += uint64(decoded / sm.dbl.Prologue.LineRange)
-	sm.basicBlock = false
-	sm.lastWasStandard = false
-}
-
-func execExtendedOpcode(sm *StateMachine, instr byte, buf *bytes.Buffer) {
-	_, _ = util.DecodeULEB128(buf)
-	b, _ := buf.ReadByte()
-	fn, ok := extendedopcodes[b]
-	if !ok {
-		panic(fmt.Sprintf("Encountered unknown extended opcode %#v\n", b))
-	}
-	sm.lastWasStandard = false
-
-	fn(sm, buf)
-}
-
-func execStandardOpcode(sm *StateMachine, instr byte, buf *bytes.Buffer) {
-	fn, ok := standardopcodes[instr]
-	if !ok {
-		panic(fmt.Sprintf("Encountered unknown standard opcode %#v\n", instr))
-	}
-	sm.lastWasStandard = true
-
-	fn(sm, buf)
-}
-
-func copyfn(sm *StateMachine, buf *bytes.Buffer) {
-	sm.basicBlock = false
-}
-
-func advancepc(sm *StateMachine, buf *bytes.Buffer) {
-	addr, _ := util.DecodeULEB128(buf)
-	sm.address += addr * uint64(sm.dbl.Prologue.MinInstrLength)
-}
-
-func advanceline(sm *StateMachine, buf *bytes.Buffer) {
-	line, _ := util.DecodeSLEB128(buf)
-	sm.line += int(line)
-	sm.lastDelta = int(line)
-}
-
-func setfile(sm *StateMachine, buf *bytes.Buffer) {
-	i, _ := util.DecodeULEB128(buf)
-	sm.file = sm.dbl.FileNames[i-1].Name
-}
-
-func setcolumn(sm *StateMachine, buf *bytes.Buffer) {
-	c, _ := util.DecodeULEB128(buf)
-	sm.column = uint(c)
-}
-
-func negatestmt(sm *StateMachine, buf *bytes.Buffer) {
-	sm.isStmt = !sm.isStmt
-}
-
-func setbasicblock(sm *StateMachine, buf *bytes.Buffer) {
-	sm.basicBlock = true
-}
-
-func constaddpc(sm *StateMachine, buf *bytes.Buffer) {
-	sm.address += (255 / uint64(sm.dbl.Prologue.LineRange))
-}
-
-func fixedadvancepc(sm *StateMachine, buf *bytes.Buffer) {
-	var operand uint16
-	binary.Read(buf, binary.LittleEndian, &operand)
-
-	sm.address += uint64(operand)
-}
-
-func endsequence(sm *StateMachine, buf *bytes.Buffer) {
-	sm.endSeq = true
-}
-
-func setaddress(sm *StateMachine, buf *bytes.Buffer) {
-	var addr uint64
-
-	binary.Read(buf, binary.LittleEndian, &addr)
-
-	sm.address = addr
-}
-
-func definefile(sm *StateMachine, buf *bytes.Buffer) {
-	var (
-		_, _ = util.ParseString(buf)
-		_, _ = util.DecodeULEB128(buf)
-		_, _ = util.DecodeULEB128(buf)
-		_, _ = util.DecodeULEB128(buf)
-	)
-
-	// Don't do anything here yet.
-}

vendor/github.com/derekparker/delve/dwarf/op/op.go

@@ -1,84 +0,0 @@
-package op
-
-import (
-	"bytes"
-	"encoding/binary"
-	"errors"
-	"fmt"
-
-	"github.com/derekparker/delve/dwarf/util"
-)
-
-const (
-	DW_OP_addr           = 0x3
-	DW_OP_call_frame_cfa = 0x9c
-	DW_OP_plus           = 0x22
-	DW_OP_consts         = 0x11
-	DW_OP_plus_uconsts   = 0x23
-)
-
-type stackfn func(*bytes.Buffer, []int64, int64) ([]int64, error)
-
-var oplut = map[byte]stackfn{
-	DW_OP_call_frame_cfa: callframecfa,
-	DW_OP_plus:           plus,
-	DW_OP_consts:         consts,
-	DW_OP_addr:           addr,
-	DW_OP_plus_uconsts:   plusuconsts,
-}
-
-func ExecuteStackProgram(cfa int64, instructions []byte) (int64, error) {
-	stack := make([]int64, 0, 3)
-	buf := bytes.NewBuffer(instructions)
-
-	for opcode, err := buf.ReadByte(); err == nil; opcode, err = buf.ReadByte() {
-		fn, ok := oplut[opcode]
-		if !ok {
-			return 0, fmt.Errorf("invalid instruction %#v", opcode)
-		}
-
-		stack, err = fn(buf, stack, cfa)
-		if err != nil {
-			return 0, err
-		}
-	}
-
-	if len(stack) == 0 {
-		return 0, errors.New("empty OP stack")
-	}
-
-	return stack[len(stack)-1], nil
-}
-
-func callframecfa(buf *bytes.Buffer, stack []int64, cfa int64) ([]int64, error) {
-	if cfa == 0 {
-		return stack, fmt.Errorf("Could not retrieve CFA for current PC")
-	}
-	return append(stack, int64(cfa)), nil
-}
-
-func addr(buf *bytes.Buffer, stack []int64, cfa int64) ([]int64, error) {
-	return append(stack, int64(binary.LittleEndian.Uint64(buf.Next(8)))), nil
-}
-
-func plus(buf *bytes.Buffer, stack []int64, cfa int64) ([]int64, error) {
-	var (
-		slen   = len(stack)
-		digits = stack[slen-2 : slen]
-		st     = stack[:slen-2]
-	)
-
-	return append(st, digits[0]+digits[1]), nil
-}
-
-func plusuconsts(buf *bytes.Buffer, stack []int64, cfa int64) ([]int64, error) {
-	slen := len(stack)
-	num, _ := util.DecodeULEB128(buf)
-	stack[slen-1] = stack[slen-1] + int64(num)
-	return stack, nil
-}
-
-func consts(buf *bytes.Buffer, stack []int64, cfa int64) ([]int64, error) {
-	num, _ := util.DecodeSLEB128(buf)
-	return append(stack, num), nil
-}

vendor/github.com/derekparker/delve/pkg/config/config.go

@@ -7,7 +7,7 @@ import (
 	"os/user"
 	"path"
 
-	yaml "gopkg.in/yaml.v2"
+	"gopkg.in/yaml.v2"
 )
 
 const (
@@ -20,7 +20,7 @@ type SubstitutePathRule struct {
 	// Directory path will be substituted if it matches `From`.
 	From string
 	// Path to which substitution is performed.
-	To   string
+	To string
 }
 
 // Slice of source code path substitution rules.
@@ -29,9 +29,24 @@ type SubstitutePathRules []SubstitutePathRule
 // Config defines all configuration options available to be set through the config file.
 type Config struct {
 	// Commands aliases.
-	Aliases        map[string][]string
+	Aliases map[string][]string `yaml:"aliases"`
 	// Source code path substitution rules.
 	SubstitutePath SubstitutePathRules `yaml:"substitute-path"`
+
+	// MaxStringLen is the maximum string length that the commands print,
+	// locals, args and vars should read (in verbose mode).
+	MaxStringLen *int `yaml:"max-string-len,omitempty"`
+	// MaxArrayValues is the maximum number of array items that the commands
+	// print, locals, args and vars should read (in verbose mode).
+	MaxArrayValues *int `yaml:"max-array-values,omitempty"`
+
+	// If ShowLocationExpr is true whatis will print the DWARF location
+	// expression for its argument.
+	ShowLocationExpr bool `yaml:"show-location-expr"`
+	
+	// Source list line-number color (3/4 bit color codes as defined
+	// here: https://en.wikipedia.org/wiki/ANSI_escape_code#Colors)
+	SourceListLineColor int `yaml:"source-list-line-color"`
 }
 
 // LoadConfig attempts to populate a Config object from the config.yml file.
@@ -49,8 +64,11 @@ func LoadConfig() *Config {
 
 	f, err := os.Open(fullConfigFile)
 	if err != nil {
-		createDefaultConfig(fullConfigFile)
+		f, err = createDefaultConfig(fullConfigFile)
-		return nil
+		if err != nil {
+			fmt.Printf("Error creating default config file: %v", err)
+			return nil
+		}
 	}
 	defer func() {
 		err := f.Close()
@@ -75,22 +93,37 @@ func LoadConfig() *Config {
 	return &c
 }
 
-func createDefaultConfig(path string) {
+func SaveConfig(conf *Config) error {
+	fullConfigFile, err := GetConfigFilePath(configFile)
+	if err != nil {
+		return err
+	}
+
+	out, err := yaml.Marshal(*conf)
+	if err != nil {
+		return err
+	}
+
+	f, err := os.Create(fullConfigFile)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	_, err = f.Write(out)
+	return err
+}
+
+func createDefaultConfig(path string) (*os.File, error) {
 	f, err := os.Create(path)
 	if err != nil {
-		fmt.Printf("Unable to create config file: %v.", err)
+		return nil, fmt.Errorf("Unable to create config file: %v.", err)
-		return
 	}
-	defer func() {
-		err := f.Close()
-		if err != nil {
-			fmt.Printf("Closing config file failed: %v.", err)
-		}
-	}()
 	err = writeDefaultConfig(f)
 	if err != nil {
-		fmt.Printf("Unable to write default configuration: %v.", err)
+		return nil, fmt.Errorf("Unable to write default configuration: %v.", err)
 	}
+	return f, nil
 }
 
 func writeDefaultConfig(f *os.File) error {
@@ -100,6 +133,11 @@ func writeDefaultConfig(f *os.File) error {
 # This is the default configuration file. Available options are provided, but disabled.
 # Delete the leading hash mark to enable an item.
 
+# Uncomment the following line and set your preferred ANSI foreground color
+# for source line numbers in the (list) command (if unset, default is 34,
+# dark blue) See https://en.wikipedia.org/wiki/ANSI_escape_code#3/4_bit
+# source-list-line-color: 34
+
 # Provided aliases will be added to the default aliases for a given command.
 aliases:
   # command: ["alias1", "alias2"]
@@ -111,6 +149,15 @@ aliases:
 # commands.
 substitute-path:
   # - {from: path, to: path}
+  
+# Maximum number of elements loaded from an array.
+# max-array-values: 64
+
+# Maximum loaded string length.
+# max-string-len: 64
+
+# Uncomment the following line to make the whatis command also print the DWARF location expression of its argument.
+# show-location-expr: true
 `)
 	return err
 }

vendor/github.com/derekparker/delve/pkg/config/split.go

@@ -0,0 +1,63 @@
+package config
+
+import (
+	"bytes"
+	"unicode"
+)
+
+// Like strings.Fields but ignores spaces inside areas surrounded
+// by the specified quote character.
+// To specify a single quote use backslash to escape it: '\''
+func SplitQuotedFields(in string, quote rune) []string {
+	type stateEnum int
+	const (
+		inSpace stateEnum = iota
+		inField
+		inQuote
+		inQuoteEscaped
+	)
+	state := inSpace
+	r := []string{}
+	var buf bytes.Buffer
+
+	for _, ch := range in {
+		switch state {
+		case inSpace:
+			if ch == quote {
+				state = inQuote
+			} else if !unicode.IsSpace(ch) {
+				buf.WriteRune(ch)
+				state = inField
+			}
+
+		case inField:
+			if ch == quote {
+				state = inQuote
+			} else if unicode.IsSpace(ch) {
+				r = append(r, buf.String())
+				buf.Reset()
+			} else {
+				buf.WriteRune(ch)
+			}
+
+		case inQuote:
+			if ch == quote {
+				state = inField
+			} else if ch == '\\' {
+				state = inQuoteEscaped
+			} else {
+				buf.WriteRune(ch)
+			}
+
+		case inQuoteEscaped:
+			buf.WriteRune(ch)
+			state = inQuote
+		}
+	}
+
+	if buf.Len() != 0 {
+		r = append(r, buf.String())
+	}
+
+	return r
+}

vendor/github.com/derekparker/delve/pkg/dwarf/frame/entries.go

@@ -17,6 +17,7 @@ type CommonInformationEntry struct {
 	DataAlignmentFactor   int64
 	ReturnAddressRegister uint64
 	InitialInstructions   []byte
+	staticBase            uint64
 }
 
 // Represents a Frame Descriptor Entry in the
@@ -25,17 +26,14 @@ type FrameDescriptionEntry struct {
 	Length       uint32
 	CIE          *CommonInformationEntry
 	Instructions []byte
-	begin, end   uint64
+	begin, size  uint64
 	order        binary.ByteOrder
 }
 
 // Returns whether or not the given address is within the
 // bounds of this frame.
 func (fde *FrameDescriptionEntry) Cover(addr uint64) bool {
-	if (addr - fde.begin) < fde.end {
+	return (addr - fde.begin) < fde.size
-		return true
-	}
-	return false
 }
 
 // Address of first location for this frame.
@@ -45,7 +43,7 @@ func (fde *FrameDescriptionEntry) Begin() uint64 {
 
 // Address of last location for this frame.
 func (fde *FrameDescriptionEntry) End() uint64 {
-	return fde.begin + fde.end
+	return fde.begin + fde.size
 }
 
 // Set up frame for the given PC.
@@ -53,43 +51,27 @@ func (fde *FrameDescriptionEntry) EstablishFrame(pc uint64) *FrameContext {
 	return executeDwarfProgramUntilPC(fde, pc)
 }
 
-// Return the offset from the current SP that the return address is stored at.
-func (fde *FrameDescriptionEntry) ReturnAddressOffset(pc uint64) (frameOffset, returnAddressOffset int64) {
-	frame := fde.EstablishFrame(pc)
-	return frame.cfa.offset, frame.regs[fde.CIE.ReturnAddressRegister].offset
-}
-
 type FrameDescriptionEntries []*FrameDescriptionEntry
 
 func NewFrameIndex() FrameDescriptionEntries {
 	return make(FrameDescriptionEntries, 0, 1000)
 }
 
-type NoFDEForPCError struct {
+type ErrNoFDEForPC struct {
 	PC uint64
 }
 
-func (err *NoFDEForPCError) Error() string {
+func (err *ErrNoFDEForPC) Error() string {
 	return fmt.Sprintf("could not find FDE for PC %#v", err.PC)
 }
 
 // Returns the Frame Description Entry for the given PC.
 func (fdes FrameDescriptionEntries) FDEForPC(pc uint64) (*FrameDescriptionEntry, error) {
 	idx := sort.Search(len(fdes), func(i int) bool {
-		if fdes[i].Cover(pc) {
+		return fdes[i].Cover(pc) || fdes[i].Begin() >= pc
-			return true
-		}
-		if fdes[i].LessThan(pc) {
-			return false
-		}
-		return true
 	})
-	if idx == len(fdes) {
+	if idx == len(fdes) || !fdes[idx].Cover(pc) {
-		return nil, &NoFDEForPCError{pc}
+		return nil, &ErrNoFDEForPC{pc}
 	}
 	return fdes[idx], nil
 }
-
-func (frame *FrameDescriptionEntry) LessThan(pc uint64) bool {
-	return frame.End() <= pc
-}

vendor/github.com/derekparker/delve/pkg/dwarf/frame/parser.go

@@ -7,12 +7,14 @@ import (
 	"bytes"
 	"encoding/binary"
 
-	"github.com/derekparker/delve/dwarf/util"
+	"github.com/derekparker/delve/pkg/dwarf/util"
 )
 
 type parsefunc func(*parseContext) parsefunc
 
 type parseContext struct {
+	staticBase uint64
+
 	buf     *bytes.Buffer
 	entries FrameDescriptionEntries
 	common  *CommonInformationEntry
@@ -23,10 +25,10 @@ type parseContext struct {
 // Parse takes in data (a byte slice) and returns a slice of
 // commonInformationEntry structures. Each commonInformationEntry
 // has a slice of frameDescriptionEntry structures.
-func Parse(data []byte, order binary.ByteOrder) FrameDescriptionEntries {
+func Parse(data []byte, order binary.ByteOrder, staticBase uint64) FrameDescriptionEntries {
 	var (
 		buf  = bytes.NewBuffer(data)
-		pctx = &parseContext{buf: buf, entries: NewFrameIndex()}
+		pctx = &parseContext{buf: buf, entries: NewFrameIndex(), staticBase: staticBase}
 	)
 
 	for fn := parselength; buf.Len() != 0; {
@@ -45,12 +47,19 @@ func cieEntry(data []byte) bool {
 }
 
 func parselength(ctx *parseContext) parsefunc {
-	var data = ctx.buf.Next(8)
+	binary.Read(ctx.buf, binary.LittleEndian, &ctx.length)
 
-	ctx.length = binary.LittleEndian.Uint32(data[:4]) - 4 // take off the length of the CIE id / CIE pointer.
+	if ctx.length == 0 {
+		// ZERO terminator
+		return parselength
+	}
 
-	if cieEntry(data[4:]) {
+	var data = ctx.buf.Next(4)
-		ctx.common = &CommonInformationEntry{Length: ctx.length}
+
+	ctx.length -= 4 // take off the length of the CIE id / CIE pointer.
+
+	if cieEntry(data) {
+		ctx.common = &CommonInformationEntry{Length: ctx.length, staticBase: ctx.staticBase}
 		return parseCIE
 	}
 
@@ -61,8 +70,8 @@ func parselength(ctx *parseContext) parsefunc {
 func parseFDE(ctx *parseContext) parsefunc {
 	r := ctx.buf.Next(int(ctx.length))
 
-	ctx.frame.begin = binary.LittleEndian.Uint64(r[:8])
+	ctx.frame.begin = binary.LittleEndian.Uint64(r[:8]) + ctx.staticBase
-	ctx.frame.end = binary.LittleEndian.Uint64(r[8:16])
+	ctx.frame.size = binary.LittleEndian.Uint64(r[8:16])
 
 	// Insert into the tree after setting address range begin
 	// otherwise compares won't work.

vendor/github.com/derekparker/delve/pkg/dwarf/frame/table.go

@@ -5,41 +5,31 @@ import (
 	"encoding/binary"
 	"fmt"
 
-	"github.com/derekparker/delve/dwarf/util"
+	"github.com/derekparker/delve/pkg/dwarf/util"
 )
 
-type CurrentFrameAddress struct {
-	register   uint64
-	offset     int64
-	expression []byte
-	rule       byte
-}
-
 type DWRule struct {
-	rule       byte
+	Rule       Rule
-	offset     int64
+	Offset     int64
-	newreg     uint64
+	Reg        uint64
-	expression []byte
+	Expression []byte
 }
 
 type FrameContext struct {
 	loc           uint64
 	order         binary.ByteOrder
 	address       uint64
-	cfa           CurrentFrameAddress
+	CFA           DWRule
-	regs          map[uint64]DWRule
+	Regs          map[uint64]DWRule
 	initialRegs   map[uint64]DWRule
 	prevRegs      map[uint64]DWRule
 	buf           *bytes.Buffer
 	cie           *CommonInformationEntry
+	RetAddrReg    uint64
 	codeAlignment uint64
 	dataAlignment int64
 }
 
-func (fctx *FrameContext) CFAOffset() int64 {
-	return fctx.cfa.offset
-}
-
 // Instructions used to recreate the table from the .debug_frame data.
 const (
 	DW_CFA_nop                = 0x0        // No ops
@@ -73,15 +63,19 @@ const (
 )
 
 // Rules defined for register values.
+type Rule byte
+
 const (
-	rule_undefined = iota
+	RuleUndefined Rule = iota
-	rule_sameval
+	RuleSameVal
-	rule_offset
+	RuleOffset
-	rule_valoffset
+	RuleValOffset
-	rule_register
+	RuleRegister
-	rule_expression
+	RuleExpression
-	rule_valexpression
+	RuleValExpression
-	rule_architectural
+	RuleArchitectural
+	RuleCFA          // Value is rule.Reg + rule.Offset
+	RuleFramePointer // Value is stored at address rule.Reg + rule.Offset, but only if it's less than the current CFA, otherwise same value
 )
 
 const low_6_offset = 0x3f
@@ -124,7 +118,8 @@ func executeCIEInstructions(cie *CommonInformationEntry) *FrameContext {
 	copy(initialInstructions, cie.InitialInstructions)
 	frame := &FrameContext{
 		cie:           cie,
-		regs:          make(map[uint64]DWRule),
+		Regs:          make(map[uint64]DWRule),
+		RetAddrReg:    cie.ReturnAddressRegister,
 		initialRegs:   make(map[uint64]DWRule),
 		prevRegs:      make(map[uint64]DWRule),
 		codeAlignment: cie.CodeAlignmentFactor,
@@ -142,9 +137,7 @@ func executeDwarfProgramUntilPC(fde *FrameDescriptionEntry, pc uint64) *FrameCon
 	frame.order = fde.order
 	frame.loc = fde.Begin()
 	frame.address = pc
-	fdeInstructions := make([]byte, len(fde.Instructions))
+	frame.ExecuteUntilPC(fde.Instructions)
-	copy(fdeInstructions, fde.Instructions)
-	frame.ExecuteUntilPC(fdeInstructions)
 
 	return frame
 }
@@ -161,7 +154,7 @@ func (frame *FrameContext) ExecuteUntilPC(instructions []byte) {
 	frame.buf.Write(instructions)
 
 	// We only need to execute the instructions until
-	// ctx.loc > ctx.addess (which is the address we
+	// ctx.loc > ctx.address (which is the address we
 	// are currently at in the traced process).
 	for frame.address >= frame.loc && frame.buf.Len() > 0 {
 		executeDwarfInstruction(frame)
@@ -262,7 +255,7 @@ func offset(frame *FrameContext) {
 		offset, _ = util.DecodeULEB128(frame.buf)
 	)
 
-	frame.regs[uint64(reg)] = DWRule{offset: int64(offset) * frame.dataAlignment, rule: rule_offset}
+	frame.Regs[uint64(reg)] = DWRule{Offset: int64(offset) * frame.dataAlignment, Rule: RuleOffset}
 }
 
 func restore(frame *FrameContext) {
@@ -274,9 +267,9 @@ func restore(frame *FrameContext) {
 	reg := uint64(b & low_6_offset)
 	oldrule, ok := frame.initialRegs[reg]
 	if ok {
-		frame.regs[reg] = DWRule{offset: oldrule.offset, rule: rule_offset}
+		frame.Regs[reg] = DWRule{Offset: oldrule.Offset, Rule: RuleOffset}
 	} else {
-		frame.regs[reg] = DWRule{rule: rule_undefined}
+		frame.Regs[reg] = DWRule{Rule: RuleUndefined}
 	}
 }
 
@@ -284,7 +277,7 @@ func setloc(frame *FrameContext) {
 	var loc uint64
 	binary.Read(frame.buf, frame.order, &loc)
 
-	frame.loc = loc
+	frame.loc = loc + frame.cie.staticBase
 }
 
 func offsetextended(frame *FrameContext) {
@@ -293,31 +286,31 @@ func offsetextended(frame *FrameContext) {
 		offset, _ = util.DecodeULEB128(frame.buf)
 	)
 
-	frame.regs[reg] = DWRule{offset: int64(offset) * frame.dataAlignment, rule: rule_offset}
+	frame.Regs[reg] = DWRule{Offset: int64(offset) * frame.dataAlignment, Rule: RuleOffset}
 }
 
 func undefined(frame *FrameContext) {
 	reg, _ := util.DecodeULEB128(frame.buf)
-	frame.regs[reg] = DWRule{rule: rule_undefined}
+	frame.Regs[reg] = DWRule{Rule: RuleUndefined}
 }
 
 func samevalue(frame *FrameContext) {
 	reg, _ := util.DecodeULEB128(frame.buf)
-	frame.regs[reg] = DWRule{rule: rule_sameval}
+	frame.Regs[reg] = DWRule{Rule: RuleSameVal}
 }
 
 func register(frame *FrameContext) {
 	reg1, _ := util.DecodeULEB128(frame.buf)
 	reg2, _ := util.DecodeULEB128(frame.buf)
-	frame.regs[reg1] = DWRule{newreg: reg2, rule: rule_register}
+	frame.Regs[reg1] = DWRule{Reg: reg2, Rule: RuleRegister}
 }
 
 func rememberstate(frame *FrameContext) {
-	frame.prevRegs = frame.regs
+	frame.prevRegs = frame.Regs
 }
 
 func restorestate(frame *FrameContext) {
-	frame.regs = frame.prevRegs
+	frame.Regs = frame.prevRegs
 }
 
 func restoreextended(frame *FrameContext) {
@@ -325,9 +318,9 @@ func restoreextended(frame *FrameContext) {
 
 	oldrule, ok := frame.initialRegs[reg]
 	if ok {
-		frame.regs[reg] = DWRule{offset: oldrule.offset, rule: rule_offset}
+		frame.Regs[reg] = DWRule{Offset: oldrule.Offset, Rule: RuleOffset}
 	} else {
-		frame.regs[reg] = DWRule{rule: rule_undefined}
+		frame.Regs[reg] = DWRule{Rule: RuleUndefined}
 	}
 }
 
@@ -335,32 +328,34 @@ func defcfa(frame *FrameContext) {
 	reg, _ := util.DecodeULEB128(frame.buf)
 	offset, _ := util.DecodeULEB128(frame.buf)
 
-	frame.cfa.register = reg
+	frame.CFA.Rule = RuleCFA
-	frame.cfa.offset = int64(offset)
+	frame.CFA.Reg = reg
+	frame.CFA.Offset = int64(offset)
 }
 
 func defcfaregister(frame *FrameContext) {
 	reg, _ := util.DecodeULEB128(frame.buf)
-	frame.cfa.register = reg
+	frame.CFA.Reg = reg
 }
 
 func defcfaoffset(frame *FrameContext) {
 	offset, _ := util.DecodeULEB128(frame.buf)
-	frame.cfa.offset = int64(offset)
+	frame.CFA.Offset = int64(offset)
 }
 
 func defcfasf(frame *FrameContext) {
 	reg, _ := util.DecodeULEB128(frame.buf)
 	offset, _ := util.DecodeSLEB128(frame.buf)
 
-	frame.cfa.register = reg
+	frame.CFA.Rule = RuleCFA
-	frame.cfa.offset = offset * frame.dataAlignment
+	frame.CFA.Reg = reg
+	frame.CFA.Offset = offset * frame.dataAlignment
 }
 
 func defcfaoffsetsf(frame *FrameContext) {
 	offset, _ := util.DecodeSLEB128(frame.buf)
 	offset *= frame.dataAlignment
-	frame.cfa.offset = offset
+	frame.CFA.Offset = offset
 }
 
 func defcfaexpression(frame *FrameContext) {
@@ -369,8 +364,8 @@ func defcfaexpression(frame *FrameContext) {
 		expr = frame.buf.Next(int(l))
 	)
 
-	frame.cfa.expression = expr
+	frame.CFA.Expression = expr
-	frame.cfa.rule = rule_expression
+	frame.CFA.Rule = RuleExpression
 }
 
 func expression(frame *FrameContext) {
@@ -380,7 +375,7 @@ func expression(frame *FrameContext) {
 		expr   = frame.buf.Next(int(l))
 	)
 
-	frame.regs[reg] = DWRule{rule: rule_expression, expression: expr}
+	frame.Regs[reg] = DWRule{Rule: RuleExpression, Expression: expr}
 }
 
 func offsetextendedsf(frame *FrameContext) {
@@ -389,7 +384,7 @@ func offsetextendedsf(frame *FrameContext) {
 		offset, _ = util.DecodeSLEB128(frame.buf)
 	)
 
-	frame.regs[reg] = DWRule{offset: offset * frame.dataAlignment, rule: rule_offset}
+	frame.Regs[reg] = DWRule{Offset: offset * frame.dataAlignment, Rule: RuleOffset}
 }
 
 func valoffset(frame *FrameContext) {
@@ -398,7 +393,7 @@ func valoffset(frame *FrameContext) {
 		offset, _ = util.DecodeULEB128(frame.buf)
 	)
 
-	frame.regs[reg] = DWRule{offset: int64(offset), rule: rule_valoffset}
+	frame.Regs[reg] = DWRule{Offset: int64(offset), Rule: RuleValOffset}
 }
 
 func valoffsetsf(frame *FrameContext) {
@@ -407,7 +402,7 @@ func valoffsetsf(frame *FrameContext) {
 		offset, _ = util.DecodeSLEB128(frame.buf)
 	)
 
-	frame.regs[reg] = DWRule{offset: offset * frame.dataAlignment, rule: rule_valoffset}
+	frame.Regs[reg] = DWRule{Offset: offset * frame.dataAlignment, Rule: RuleValOffset}
 }
 
 func valexpression(frame *FrameContext) {
@@ -417,7 +412,7 @@ func valexpression(frame *FrameContext) {
 		expr   = frame.buf.Next(int(l))
 	)
 
-	frame.regs[reg] = DWRule{rule: rule_valexpression, expression: expr}
+	frame.Regs[reg] = DWRule{Rule: RuleValExpression, Expression: expr}
 }
 
 func louser(frame *FrameContext) {

vendor/github.com/derekparker/delve/pkg/dwarf/godwarf/sections.go

@@ -0,0 +1,107 @@
+package godwarf
+
+import (
+	"bytes"
+	"compress/zlib"
+	"debug/elf"
+	"debug/macho"
+	"debug/pe"
+	"encoding/binary"
+	"fmt"
+	"io"
+)
+
+// GetDebugSectionElf returns the data contents of the specified debug
+// section, decompressing it if it is compressed.
+// For example GetDebugSectionElf("line") will return the contents of
+// .debug_line, if .debug_line doesn't exist it will try to return the
+// decompressed contents of .zdebug_line.
+func GetDebugSectionElf(f *elf.File, name string) ([]byte, error) {
+	sec := f.Section(".debug_" + name)
+	if sec != nil {
+		return sec.Data()
+	}
+	sec = f.Section(".zdebug_" + name)
+	if sec == nil {
+		return nil, fmt.Errorf("could not find .debug_%s section", name)
+	}
+	b, err := sec.Data()
+	if err != nil {
+		return nil, err
+	}
+	return decompressMaybe(b)
+}
+
+// GetDebugSectionPE returns the data contents of the specified debug
+// section, decompressing it if it is compressed.
+// For example GetDebugSectionPE("line") will return the contents of
+// .debug_line, if .debug_line doesn't exist it will try to return the
+// decompressed contents of .zdebug_line.
+func GetDebugSectionPE(f *pe.File, name string) ([]byte, error) {
+	sec := f.Section(".debug_" + name)
+	if sec != nil {
+		return peSectionData(sec)
+	}
+	sec = f.Section(".zdebug_" + name)
+	if sec == nil {
+		return nil, fmt.Errorf("could not find .debug_%s section", name)
+	}
+	b, err := peSectionData(sec)
+	if err != nil {
+		return nil, err
+	}
+	return decompressMaybe(b)
+}
+
+func peSectionData(sec *pe.Section) ([]byte, error) {
+	b, err := sec.Data()
+	if err != nil {
+		return nil, err
+	}
+	if 0 < sec.VirtualSize && sec.VirtualSize < sec.Size {
+		b = b[:sec.VirtualSize]
+	}
+	return b, nil
+}
+
+// GetDebugSectionMacho returns the data contents of the specified debug
+// section, decompressing it if it is compressed.
+// For example GetDebugSectionMacho("line") will return the contents of
+// __debug_line, if __debug_line doesn't exist it will try to return the
+// decompressed contents of __zdebug_line.
+func GetDebugSectionMacho(f *macho.File, name string) ([]byte, error) {
+	sec := f.Section("__debug_" + name)
+	if sec != nil {
+		return sec.Data()
+	}
+	sec = f.Section("__zdebug_" + name)
+	if sec == nil {
+		return nil, fmt.Errorf("could not find .debug_%s section", name)
+	}
+	b, err := sec.Data()
+	if err != nil {
+		return nil, err
+	}
+	return decompressMaybe(b)
+}
+
+func decompressMaybe(b []byte) ([]byte, error) {
+	if len(b) < 12 || string(b[:4]) != "ZLIB" {
+		// not compressed
+		return b, nil
+	}
+
+	dlen := binary.BigEndian.Uint64(b[4:12])
+	dbuf := make([]byte, dlen)
+	r, err := zlib.NewReader(bytes.NewBuffer(b[12:]))
+	if err != nil {
+		return nil, err
+	}
+	if _, err := io.ReadFull(r, dbuf); err != nil {
+		return nil, err
+	}
+	if err := r.Close(); err != nil {
+		return nil, err
+	}
+	return dbuf, nil
+}

vendor/github.com/derekparker/delve/pkg/dwarf/godwarf/type.go

@@ -6,16 +6,44 @@
 // The format is heavily biased toward C, but for simplicity
 // the String methods use a pseudo-Go syntax.
 
-package dwarf
+// Borrowed from golang.org/x/debug/dwarf/type.go
+
+package godwarf
 
 import (
+	"debug/dwarf"
 	"fmt"
 	"reflect"
 	"strconv"
+
+	"github.com/derekparker/delve/pkg/dwarf/op"
+	"github.com/derekparker/delve/pkg/dwarf/util"
+)
+
+const (
+	AttrGoKind          dwarf.Attr = 0x2900
+	AttrGoKey           dwarf.Attr = 0x2901
+	AttrGoElem          dwarf.Attr = 0x2902
+	AttrGoEmbeddedField dwarf.Attr = 0x2903
+	AttrGoRuntimeType   dwarf.Attr = 0x2904
+)
+
+// Basic type encodings -- the value for AttrEncoding in a TagBaseType Entry.
+const (
+	encAddress        = 0x01
+	encBoolean        = 0x02
+	encComplexFloat   = 0x03
+	encFloat          = 0x04
+	encSigned         = 0x05
+	encSignedChar     = 0x06
+	encUnsigned       = 0x07
+	encUnsignedChar   = 0x08
+	encImaginaryFloat = 0x09
 )
 
 // A Type conventionally represents a pointer to any of the
 // specific Type structures (CharType, StructType, etc.).
+//TODO: remove this use dwarf.Type
 type Type interface {
 	Common() *CommonType
 	String() string
@@ -29,7 +57,7 @@ type CommonType struct {
 	ByteSize    int64        // size of value of this type, in bytes
 	Name        string       // name that can be used to refer to type
 	ReflectKind reflect.Kind // the reflect kind of the type.
-	Offset      Offset       // the offset at which this type was read
+	Offset      dwarf.Offset // the offset at which this type was read
 }
 
 func (c *CommonType) Common() *CommonType { return c }
@@ -158,6 +186,7 @@ type StructField struct {
 	ByteSize   int64
 	BitOffset  int64 // within the ByteSize bytes at ByteOffset
 	BitSize    int64 // zero if not a bit field
+	Embedded   bool
 }
 
 func (t *StructType) String() string {
@@ -329,31 +358,19 @@ func (t *ChanType) String() string {
 	return "chan " + t.ElemType.String()
 }
 
-// typeReader is used to read from either the info section or the
-// types section.
-type typeReader interface {
-	Seek(Offset)
-	Next() (*Entry, error)
-	clone() typeReader
-	offset() Offset
-	// AddressSize returns the size in bytes of addresses in the current
-	// compilation unit.
-	AddressSize() int
-}
-
 // Type reads the type at off in the DWARF ``info'' section.
-func (d *Data) Type(off Offset) (Type, error) {
+func ReadType(d *dwarf.Data, off dwarf.Offset, typeCache map[dwarf.Offset]Type) (Type, error) {
-	return d.readType("info", d.Reader(), off, d.typeCache)
+	return readType(d, "info", d.Reader(), off, typeCache)
 }
 
-func getKind(e *Entry) reflect.Kind {
+func getKind(e *dwarf.Entry) reflect.Kind {
 	integer, _ := e.Val(AttrGoKind).(int64)
 	return reflect.Kind(integer)
 }
 
 // readType reads a type from r at off of name using and updating a
 // type cache.
-func (d *Data) readType(name string, r typeReader, off Offset, typeCache map[Offset]Type) (Type, error) {
+func readType(d *dwarf.Data, name string, r *dwarf.Reader, off dwarf.Offset, typeCache map[dwarf.Offset]Type) (Type, error) {
 	if t, ok := typeCache[off]; ok {
 		return t, nil
 	}
@@ -364,10 +381,10 @@ func (d *Data) readType(name string, r typeReader, off Offset, typeCache map[Off
 	}
 	addressSize := r.AddressSize()
 	if e == nil || e.Offset != off {
-		return nil, DecodeError{name, off, "no type at offset"}
+		return nil, dwarf.DecodeError{name, off, "no type at offset"}
 	}
 
-	// Parse type from Entry.
+	// Parse type from dwarf.Entry.
 	// Must always set typeCache[off] before calling
 	// d.Type recursively, to handle circular types correctly.
 	var typ Type
@@ -375,7 +392,7 @@ func (d *Data) readType(name string, r typeReader, off Offset, typeCache map[Off
 	nextDepth := 0
 
 	// Get next child; set err if error happens.
-	next := func() *Entry {
+	next := func() *dwarf.Entry {
 		if !e.Children {
 			return nil
 		}
@@ -390,10 +407,6 @@ func (d *Data) readType(name string, r typeReader, off Offset, typeCache map[Off
 				err = err1
 				return nil
 			}
-			if kid == nil {
-				err = DecodeError{name, r.offset(), "unexpected end of DWARF entries"}
-				return nil
-			}
 			if kid.Tag == 0 {
 				if nextDepth > 0 {
 					nextDepth--
@@ -411,20 +424,19 @@ func (d *Data) readType(name string, r typeReader, off Offset, typeCache map[Off
 		}
 	}
 
-	// Get Type referred to by Entry's attr.
+	// Get Type referred to by dwarf.Entry's attr.
 	// Set err if error happens.  Not having a type is an error.
-	typeOf := func(e *Entry, attr Attr) Type {
+	typeOf := func(e *dwarf.Entry, attr dwarf.Attr) Type {
 		tval := e.Val(attr)
 		var t Type
 		switch toff := tval.(type) {
-		case Offset:
+		case dwarf.Offset:
-			if t, err = d.readType(name, r.clone(), toff, typeCache); err != nil {
+			if t, err = readType(d, name, d.Reader(), toff, typeCache); err != nil {
 				return nil
 			}
 		case uint64:
-			if t, err = d.sigToType(toff); err != nil {
+			err = dwarf.DecodeError{name, e.Offset, "DWARFv4 section debug_types unsupported"}
-				return nil
+			return nil
-			}
 		default:
 			// It appears that no Type means "void".
 			return new(VoidType)
@@ -433,7 +445,7 @@ func (d *Data) readType(name string, r typeReader, off Offset, typeCache map[Off
 	}
 
 	switch e.Tag {
-	case TagArrayType:
+	case dwarf.TagArrayType:
 		// Multi-dimensional array.  (DWARF v2 §5.4)
 		// Attributes:
 		//	AttrType:subtype [required]
@@ -444,16 +456,16 @@ func (d *Data) readType(name string, r typeReader, off Offset, typeCache map[Off
 		//	TagSubrangeType or TagEnumerationType giving one dimension.
 		//	dimensions are in left to right order.
 		t := new(ArrayType)
-		t.Name, _ = e.Val(AttrName).(string)
+		t.Name, _ = e.Val(dwarf.AttrName).(string)
 		t.ReflectKind = getKind(e)
 		typ = t
 		typeCache[off] = t
-		if t.Type = typeOf(e, AttrType); err != nil {
+		if t.Type = typeOf(e, dwarf.AttrType); err != nil {
 			goto Error
 		}
-		if bytes, ok := e.Val(AttrStride).(int64); ok {
+		if bytes, ok := e.Val(dwarf.AttrStride).(int64); ok {
 			t.StrideBitSize = 8 * bytes
-		} else if bits, ok := e.Val(AttrStrideSize).(int64); ok {
+		} else if bits, ok := e.Val(dwarf.AttrStrideSize).(int64); ok {
 			t.StrideBitSize = bits
 		} else {
 			// If there's no stride specified, assume it's the size of the
@@ -467,11 +479,11 @@ func (d *Data) readType(name string, r typeReader, off Offset, typeCache map[Off
 			// TODO(rsc): Can also be TagEnumerationType
 			// but haven't seen that in the wild yet.
 			switch kid.Tag {
-			case TagSubrangeType:
+			case dwarf.TagSubrangeType:
-				count, ok := kid.Val(AttrCount).(int64)
+				count, ok := kid.Val(dwarf.AttrCount).(int64)
 				if !ok {
 					// Old binaries may have an upper bound instead.
-					count, ok = kid.Val(AttrUpperBound).(int64)
+					count, ok = kid.Val(dwarf.AttrUpperBound).(int64)
 					if ok {
 						count++ // Length is one more than upper bound.
 					} else {
@@ -486,8 +498,8 @@ func (d *Data) readType(name string, r typeReader, off Offset, typeCache map[Off
 					t.Type = &ArrayType{Type: t.Type, Count: count}
 				}
 				ndim++
-			case TagEnumerationType:
+			case dwarf.TagEnumerationType:
-				err = DecodeError{name, kid.Offset, "cannot handle enumeration type as array bound"}
+				err = dwarf.DecodeError{name, kid.Offset, "cannot handle enumeration type as array bound"}
 				goto Error
 			}
 		}
@@ -496,7 +508,7 @@ func (d *Data) readType(name string, r typeReader, off Offset, typeCache map[Off
 			t.Count = -1
 		}
 
-	case TagBaseType:
+	case dwarf.TagBaseType:
 		// Basic type.  (DWARF v2 §5.1)
 		// Attributes:
 		//	AttrName: name of base type in programming language of the compilation unit [required]
@@ -504,15 +516,15 @@ func (d *Data) readType(name string, r typeReader, off Offset, typeCache map[Off
 		//	AttrByteSize: size of type in bytes [required]
 		//	AttrBitOffset: for sub-byte types, size in bits
 		//	AttrBitSize: for sub-byte types, bit offset of high order bit in the AttrByteSize bytes
-		name, _ := e.Val(AttrName).(string)
+		name, _ := e.Val(dwarf.AttrName).(string)
-		enc, ok := e.Val(AttrEncoding).(int64)
+		enc, ok := e.Val(dwarf.AttrEncoding).(int64)
 		if !ok {
-			err = DecodeError{name, e.Offset, "missing encoding attribute for " + name}
+			err = dwarf.DecodeError{name, e.Offset, "missing encoding attribute for " + name}
 			goto Error
 		}
 		switch enc {
 		default:
-			err = DecodeError{name, e.Offset, "unrecognized encoding attribute value"}
+			err = dwarf.DecodeError{name, e.Offset, "unrecognized encoding attribute value"}
 			goto Error
 
 		case encAddress:
@@ -525,7 +537,7 @@ func (d *Data) readType(name string, r typeReader, off Offset, typeCache map[Off
 				// clang writes out 'complex' instead of 'complex float' or 'complex double'.
 				// clang also writes out a byte size that we can use to distinguish.
 				// See issue 8694.
-				switch byteSize, _ := e.Val(AttrByteSize).(int64); byteSize {
+				switch byteSize, _ := e.Val(dwarf.AttrByteSize).(int64); byteSize {
 				case 8:
 					name = "complex float"
 				case 16:
@@ -548,11 +560,11 @@ func (d *Data) readType(name string, r typeReader, off Offset, typeCache map[Off
 			Basic() *BasicType
 		}).Basic()
 		t.Name = name
-		t.BitSize, _ = e.Val(AttrBitSize).(int64)
+		t.BitSize, _ = e.Val(dwarf.AttrBitSize).(int64)
-		t.BitOffset, _ = e.Val(AttrBitOffset).(int64)
+		t.BitOffset, _ = e.Val(dwarf.AttrBitOffset).(int64)
 		t.ReflectKind = getKind(e)
 
-	case TagClassType, TagStructType, TagUnionType:
+	case dwarf.TagClassType, dwarf.TagStructType, dwarf.TagUnionType:
 		// Structure, union, or class type.  (DWARF v2 §5.5)
 		// Also Slices and Strings (Go-specific).
 		// Attributes:
@@ -586,26 +598,26 @@ func (d *Data) readType(name string, r typeReader, off Offset, typeCache map[Off
 		}
 		typeCache[off] = typ
 		switch e.Tag {
-		case TagClassType:
+		case dwarf.TagClassType:
 			t.Kind = "class"
-		case TagStructType:
+		case dwarf.TagStructType:
 			t.Kind = "struct"
-		case TagUnionType:
+		case dwarf.TagUnionType:
 			t.Kind = "union"
 		}
-		t.Name, _ = e.Val(AttrName).(string)
+		t.Name, _ = e.Val(dwarf.AttrName).(string)
-		t.StructName, _ = e.Val(AttrName).(string)
+		t.StructName, _ = e.Val(dwarf.AttrName).(string)
-		t.Incomplete = e.Val(AttrDeclaration) != nil
+		t.Incomplete = e.Val(dwarf.AttrDeclaration) != nil
 		t.Field = make([]*StructField, 0, 8)
 		var lastFieldType Type
 		var lastFieldBitOffset int64
 		for kid := next(); kid != nil; kid = next() {
-			if kid.Tag == TagMember {
+			if kid.Tag == dwarf.TagMember {
 				f := new(StructField)
-				if f.Type = typeOf(kid, AttrType); err != nil {
+				if f.Type = typeOf(kid, dwarf.AttrType); err != nil {
 					goto Error
 				}
-				switch loc := kid.Val(AttrDataMemberLoc).(type) {
+				switch loc := kid.Val(dwarf.AttrDataMemberLoc).(type) {
 				case []byte:
 					// TODO: Should have original compilation
 					// unit here, not unknownFormat.
@@ -613,28 +625,28 @@ func (d *Data) readType(name string, r typeReader, off Offset, typeCache map[Off
 						// Empty exprloc. f.ByteOffset=0.
 						break
 					}
-					b := makeBuf(d, unknownFormat{}, "location", 0, loc)
+					b := util.MakeBuf(d, util.UnknownFormat{}, "location", 0, loc)
-					op := b.uint8()
+					op_ := op.Opcode(b.Uint8())
-					switch op {
+					switch op_ {
-					case opPlusUconst:
+					case op.DW_OP_plus_uconst:
 						// Handle opcode sequence [DW_OP_plus_uconst <uleb128>]
-						f.ByteOffset = int64(b.uint())
+						f.ByteOffset = int64(b.Uint())
-						b.assertEmpty()
+						b.AssertEmpty()
-					case opConsts:
+					case op.DW_OP_consts:
 						// Handle opcode sequence [DW_OP_consts <sleb128> DW_OP_plus]
-						f.ByteOffset = b.int()
+						f.ByteOffset = b.Int()
-						op = b.uint8()
+						op_ = op.Opcode(b.Uint8())
-						if op != opPlus {
+						if op_ != op.DW_OP_plus {
-							err = DecodeError{name, kid.Offset, fmt.Sprintf("unexpected opcode 0x%x", op)}
+							err = dwarf.DecodeError{name, kid.Offset, fmt.Sprintf("unexpected opcode 0x%x", op_)}
 							goto Error
 						}
-						b.assertEmpty()
+						b.AssertEmpty()
 					default:
-						err = DecodeError{name, kid.Offset, fmt.Sprintf("unexpected opcode 0x%x", op)}
+						err = dwarf.DecodeError{name, kid.Offset, fmt.Sprintf("unexpected opcode 0x%x", op_)}
 						goto Error
 					}
-					if b.err != nil {
+					if b.Err != nil {
-						err = b.err
+						err = b.Err
 						goto Error
 					}
 				case int64:
@@ -642,10 +654,11 @@ func (d *Data) readType(name string, r typeReader, off Offset, typeCache map[Off
 				}
 
 				haveBitOffset := false
-				f.Name, _ = kid.Val(AttrName).(string)
+				f.Name, _ = kid.Val(dwarf.AttrName).(string)
-				f.ByteSize, _ = kid.Val(AttrByteSize).(int64)
+				f.ByteSize, _ = kid.Val(dwarf.AttrByteSize).(int64)
-				f.BitOffset, haveBitOffset = kid.Val(AttrBitOffset).(int64)
+				f.BitOffset, haveBitOffset = kid.Val(dwarf.AttrBitOffset).(int64)
-				f.BitSize, _ = kid.Val(AttrBitSize).(int64)
+				f.BitSize, _ = kid.Val(dwarf.AttrBitSize).(int64)
+				f.Embedded, _ = kid.Val(AttrGoEmbeddedField).(bool)
 				t.Field = append(t.Field, f)
 
 				bito := f.BitOffset
@@ -662,35 +675,35 @@ func (d *Data) readType(name string, r typeReader, off Offset, typeCache map[Off
 			}
 		}
 		if t.Kind != "union" {
-			b, ok := e.Val(AttrByteSize).(int64)
+			b, ok := e.Val(dwarf.AttrByteSize).(int64)
 			if ok && b*8 == lastFieldBitOffset {
 				// Final field must be zero width.  Fix array length.
 				zeroArray(lastFieldType)
 			}
 		}
 
-	case TagConstType, TagVolatileType, TagRestrictType:
+	case dwarf.TagConstType, dwarf.TagVolatileType, dwarf.TagRestrictType:
 		// Type modifier (DWARF v2 §5.2)
 		// Attributes:
 		//	AttrType: subtype
 		t := new(QualType)
-		t.Name, _ = e.Val(AttrName).(string)
+		t.Name, _ = e.Val(dwarf.AttrName).(string)
 		t.ReflectKind = getKind(e)
 		typ = t
 		typeCache[off] = t
-		if t.Type = typeOf(e, AttrType); err != nil {
+		if t.Type = typeOf(e, dwarf.AttrType); err != nil {
 			goto Error
 		}
 		switch e.Tag {
-		case TagConstType:
+		case dwarf.TagConstType:
 			t.Qual = "const"
-		case TagRestrictType:
+		case dwarf.TagRestrictType:
 			t.Qual = "restrict"
-		case TagVolatileType:
+		case dwarf.TagVolatileType:
 			t.Qual = "volatile"
 		}
 
-	case TagEnumerationType:
+	case dwarf.TagEnumerationType:
 		// Enumeration type (DWARF v2 §5.6)
 		// Attributes:
 		//	AttrName: enum name if any
@@ -703,14 +716,14 @@ func (d *Data) readType(name string, r typeReader, off Offset, typeCache map[Off
 		t.ReflectKind = getKind(e)
 		typ = t
 		typeCache[off] = t
-		t.Name, _ = e.Val(AttrName).(string)
+		t.Name, _ = e.Val(dwarf.AttrName).(string)
-		t.EnumName, _ = e.Val(AttrName).(string)
+		t.EnumName, _ = e.Val(dwarf.AttrName).(string)
 		t.Val = make([]*EnumValue, 0, 8)
 		for kid := next(); kid != nil; kid = next() {
-			if kid.Tag == TagEnumerator {
+			if kid.Tag == dwarf.TagEnumerator {
 				f := new(EnumValue)
-				f.Name, _ = kid.Val(AttrName).(string)
+				f.Name, _ = kid.Val(dwarf.AttrName).(string)
-				f.Val, _ = kid.Val(AttrConstValue).(int64)
+				f.Val, _ = kid.Val(dwarf.AttrConstValue).(int64)
 				n := len(t.Val)
 				if n >= cap(t.Val) {
 					val := make([]*EnumValue, n, n*2)
@@ -722,23 +735,23 @@ func (d *Data) readType(name string, r typeReader, off Offset, typeCache map[Off
 			}
 		}
 
-	case TagPointerType:
+	case dwarf.TagPointerType:
 		// Type modifier (DWARF v2 §5.2)
 		// Attributes:
 		//	AttrType: subtype [not required!  void* has no AttrType]
 		//	AttrAddrClass: address class [ignored]
 		t := new(PtrType)
-		t.Name, _ = e.Val(AttrName).(string)
+		t.Name, _ = e.Val(dwarf.AttrName).(string)
 		t.ReflectKind = getKind(e)
 		typ = t
 		typeCache[off] = t
-		if e.Val(AttrType) == nil {
+		if e.Val(dwarf.AttrType) == nil {
 			t.Type = &VoidType{}
 			break
 		}
-		t.Type = typeOf(e, AttrType)
+		t.Type = typeOf(e, dwarf.AttrType)
 
-	case TagSubroutineType:
+	case dwarf.TagSubroutineType:
 		// Subroutine type.  (DWARF v2 §5.7)
 		// Attributes:
 		//	AttrType: type of return value if any
@@ -749,11 +762,11 @@ func (d *Data) readType(name string, r typeReader, off Offset, typeCache map[Off
 		//		AttrType: type of parameter
 		//	TagUnspecifiedParameter: final ...
 		t := new(FuncType)
-		t.Name, _ = e.Val(AttrName).(string)
+		t.Name, _ = e.Val(dwarf.AttrName).(string)
 		t.ReflectKind = getKind(e)
 		typ = t
 		typeCache[off] = t
-		if t.ReturnType = typeOf(e, AttrType); err != nil {
+		if t.ReturnType = typeOf(e, dwarf.AttrType); err != nil {
 			goto Error
 		}
 		t.ParamType = make([]Type, 0, 8)
@@ -762,17 +775,17 @@ func (d *Data) readType(name string, r typeReader, off Offset, typeCache map[Off
 			switch kid.Tag {
 			default:
 				continue
-			case TagFormalParameter:
+			case dwarf.TagFormalParameter:
-				if tkid = typeOf(kid, AttrType); err != nil {
+				if tkid = typeOf(kid, dwarf.AttrType); err != nil {
 					goto Error
 				}
-			case TagUnspecifiedParameters:
+			case dwarf.TagUnspecifiedParameters:
 				tkid = &DotDotDotType{}
 			}
 			t.ParamType = append(t.ParamType, tkid)
 		}
 
-	case TagTypedef:
+	case dwarf.TagTypedef:
 		// Typedef (DWARF v2 §5.3)
 		// Also maps and channels (Go-specific).
 		// Attributes:
@@ -802,17 +815,17 @@ func (d *Data) readType(name string, r typeReader, off Offset, typeCache map[Off
 			typ = t
 		}
 		typeCache[off] = typ
-		t.Name, _ = e.Val(AttrName).(string)
+		t.Name, _ = e.Val(dwarf.AttrName).(string)
-		t.Type = typeOf(e, AttrType)
+		t.Type = typeOf(e, dwarf.AttrType)
 
-	case TagUnspecifiedType:
+	case dwarf.TagUnspecifiedType:
 		// Unspecified type (DWARF v3 §5.2)
 		// Attributes:
 		//      AttrName: name
 		t := new(UnspecifiedType)
 		typ = t
 		typeCache[off] = t
-		t.Name, _ = e.Val(AttrName).(string)
+		t.Name, _ = e.Val(dwarf.AttrName).(string)
 	}
 
 	if err != nil {
@@ -822,7 +835,7 @@ func (d *Data) readType(name string, r typeReader, off Offset, typeCache map[Off
 	typ.Common().Offset = off
 
 	{
-		b, ok := e.Val(AttrByteSize).(int64)
+		b, ok := e.Val(dwarf.AttrByteSize).(int64)
 		if !ok {
 			b = -1
 			switch t := typ.(type) {
@@ -836,6 +849,9 @@ func (d *Data) readType(name string, r typeReader, off Offset, typeCache map[Off
 				b = t.Type.Size()
 			case *PtrType:
 				b = int64(addressSize)
+			case *FuncType:
+				// on Go < 1.10 function types do not have a DW_AT_byte_size attribute.
+				b = int64(addressSize)
 			}
 		}
 		typ.Common().ByteSize = b

vendor/github.com/derekparker/delve/pkg/dwarf/line/line_parser.go

@@ -0,0 +1,152 @@
+package line
+
+import (
+	"bytes"
+	"encoding/binary"
+	"path/filepath"
+
+	"github.com/derekparker/delve/pkg/dwarf/util"
+)
+
+type DebugLinePrologue struct {
+	UnitLength     uint32
+	Version        uint16
+	Length         uint32
+	MinInstrLength uint8
+	InitialIsStmt  uint8
+	LineBase       int8
+	LineRange      uint8
+	OpcodeBase     uint8
+	StdOpLengths   []uint8
+}
+
+type DebugLineInfo struct {
+	Prologue     *DebugLinePrologue
+	IncludeDirs  []string
+	FileNames    []*FileEntry
+	Instructions []byte
+	Lookup       map[string]*FileEntry
+
+	Logf func(string, ...interface{})
+
+	// stateMachineCache[pc] is a state machine stopped at pc
+	stateMachineCache map[uint64]*StateMachine
+
+	// lastMachineCache[pc] is a state machine stopped at an address after pc
+	lastMachineCache map[uint64]*StateMachine
+	
+	// staticBase is the address at which the executable is loaded, 0 for non-PIEs
+	staticBase uint64
+}
+
+type FileEntry struct {
+	Path        string
+	DirIdx      uint64
+	LastModTime uint64
+	Length      uint64
+}
+
+type DebugLines []*DebugLineInfo
+
+// ParseAll parses all debug_line segments found in data
+func ParseAll(data []byte, logfn func(string, ...interface{}), staticBase uint64) DebugLines {
+	var (
+		lines = make(DebugLines, 0)
+		buf   = bytes.NewBuffer(data)
+	)
+
+	// We have to parse multiple file name tables here.
+	for buf.Len() > 0 {
+		lines = append(lines, Parse("", buf, logfn, staticBase))
+	}
+
+	return lines
+}
+
+// Parse parses a single debug_line segment from buf. Compdir is the
+// DW_AT_comp_dir attribute of the associated compile unit.
+func Parse(compdir string, buf *bytes.Buffer, logfn func(string, ...interface{}), staticBase uint64) *DebugLineInfo {
+	dbl := new(DebugLineInfo)
+	dbl.Logf = logfn
+	dbl.staticBase = staticBase
+	dbl.Lookup = make(map[string]*FileEntry)
+	if compdir != "" {
+		dbl.IncludeDirs = append(dbl.IncludeDirs, compdir)
+	}
+
+	dbl.stateMachineCache = make(map[uint64]*StateMachine)
+	dbl.lastMachineCache = make(map[uint64]*StateMachine)
+
+	parseDebugLinePrologue(dbl, buf)
+	parseIncludeDirs(dbl, buf)
+	parseFileEntries(dbl, buf)
+
+	// Instructions size calculation breakdown:
+	//   - dbl.Prologue.UnitLength is the length of the entire unit, not including the 4 bytes to represent that length.
+	//   - dbl.Prologue.Length is the length of the prologue not including unit length, version or prologue length itself.
+	//   - So you have UnitLength - PrologueLength - (version_length_bytes(2) + prologue_length_bytes(4)).
+	dbl.Instructions = buf.Next(int(dbl.Prologue.UnitLength - dbl.Prologue.Length - 6))
+
+	return dbl
+}
+
+func parseDebugLinePrologue(dbl *DebugLineInfo, buf *bytes.Buffer) {
+	p := new(DebugLinePrologue)
+
+	p.UnitLength = binary.LittleEndian.Uint32(buf.Next(4))
+	p.Version = binary.LittleEndian.Uint16(buf.Next(2))
+	p.Length = binary.LittleEndian.Uint32(buf.Next(4))
+	p.MinInstrLength = uint8(buf.Next(1)[0])
+	p.InitialIsStmt = uint8(buf.Next(1)[0])
+	p.LineBase = int8(buf.Next(1)[0])
+	p.LineRange = uint8(buf.Next(1)[0])
+	p.OpcodeBase = uint8(buf.Next(1)[0])
+
+	p.StdOpLengths = make([]uint8, p.OpcodeBase-1)
+	binary.Read(buf, binary.LittleEndian, &p.StdOpLengths)
+
+	dbl.Prologue = p
+}
+
+func parseIncludeDirs(info *DebugLineInfo, buf *bytes.Buffer) {
+	for {
+		str, _ := util.ParseString(buf)
+		if str == "" {
+			break
+		}
+
+		info.IncludeDirs = append(info.IncludeDirs, str)
+	}
+}
+
+func parseFileEntries(info *DebugLineInfo, buf *bytes.Buffer) {
+	for {
+		entry := readFileEntry(info, buf, true)
+		if entry.Path == "" {
+			break
+		}
+
+		info.FileNames = append(info.FileNames, entry)
+		info.Lookup[entry.Path] = entry
+	}
+}
+
+func readFileEntry(info *DebugLineInfo, buf *bytes.Buffer, exitOnEmptyPath bool) *FileEntry {
+	entry := new(FileEntry)
+
+	entry.Path, _ = util.ParseString(buf)
+	if entry.Path == "" && exitOnEmptyPath {
+		return entry
+	}
+
+	entry.DirIdx, _ = util.DecodeULEB128(buf)
+	entry.LastModTime, _ = util.DecodeULEB128(buf)
+	entry.Length, _ = util.DecodeULEB128(buf)
+	if !filepath.IsAbs(entry.Path) {
+		if entry.DirIdx >= 0 && entry.DirIdx < uint64(len(info.IncludeDirs)) {
+			entry.Path = filepath.Join(info.IncludeDirs[entry.DirIdx], entry.Path)
+		}
+	}
+
+	return entry
+}

vendor/github.com/derekparker/delve/pkg/dwarf/line/state_machine.go

@@ -0,0 +1,450 @@
+package line
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"io"
+
+	"github.com/derekparker/delve/pkg/dwarf/util"
+)
+
+type Location struct {
+	File    string
+	Line    int
+	Address uint64
+	Delta   int
+}
+
+type StateMachine struct {
+	dbl           *DebugLineInfo
+	file          string
+	line          int
+	address       uint64
+	column        uint
+	isStmt        bool
+	basicBlock    bool
+	endSeq        bool
+	lastDelta     int
+	prologueEnd   bool
+	epilogueBegin bool
+	// valid is true if the current value of the state machine is the address of
+	// an instruction (using the terminology used by DWARF spec the current
+	// value of the state machine should be appended to the matrix representing
+	// the compilation unit)
+	valid bool
+
+	started bool
+
+	buf     *bytes.Buffer // remaining instructions
+	opcodes []opcodefn
+
+	definedFiles []*FileEntry // files defined with DW_LINE_define_file
+
+	lastAddress uint64
+	lastFile    string
+	lastLine    int
+}
+
+type opcodeKind uint8
+
+const (
+	specialOpcode opcodeKind = iota
+	standardOpcode
+	extendedOpcode
+)
+
+type opcodefn func(*StateMachine, *bytes.Buffer)
+
+// Special opcodes
+const (
+	DW_LNS_copy             = 1
+	DW_LNS_advance_pc       = 2
+	DW_LNS_advance_line     = 3
+	DW_LNS_set_file         = 4
+	DW_LNS_set_column       = 5
+	DW_LNS_negate_stmt      = 6
+	DW_LNS_set_basic_block  = 7
+	DW_LNS_const_add_pc     = 8
+	DW_LNS_fixed_advance_pc = 9
+	DW_LNS_prologue_end     = 10
+	DW_LNS_epilogue_begin   = 11
+)
+
+// Extended opcodes
+const (
+	DW_LINE_end_sequence = 1
+	DW_LINE_set_address  = 2
+	DW_LINE_define_file  = 3
+)
+
+var standardopcodes = map[byte]opcodefn{
+	DW_LNS_copy:             copyfn,
+	DW_LNS_advance_pc:       advancepc,
+	DW_LNS_advance_line:     advanceline,
+	DW_LNS_set_file:         setfile,
+	DW_LNS_set_column:       setcolumn,
+	DW_LNS_negate_stmt:      negatestmt,
+	DW_LNS_set_basic_block:  setbasicblock,
+	DW_LNS_const_add_pc:     constaddpc,
+	DW_LNS_fixed_advance_pc: fixedadvancepc,
+	DW_LNS_prologue_end:     prologueend,
+	DW_LNS_epilogue_begin:   epiloguebegin,
+}
+
+var extendedopcodes = map[byte]opcodefn{
+	DW_LINE_end_sequence: endsequence,
+	DW_LINE_set_address:  setaddress,
+	DW_LINE_define_file:  definefile,
+}
+
+func newStateMachine(dbl *DebugLineInfo, instructions []byte) *StateMachine {
+	opcodes := make([]opcodefn, len(standardopcodes)+1)
+	opcodes[0] = execExtendedOpcode
+	for op := range standardopcodes {
+		opcodes[op] = standardopcodes[op]
+	}
+	sm := &StateMachine{dbl: dbl, file: dbl.FileNames[0].Path, line: 1, buf: bytes.NewBuffer(instructions), opcodes: opcodes, isStmt: dbl.Prologue.InitialIsStmt == uint8(1), address: dbl.staticBase}
+	return sm
+}
+
+// Returns all PCs for a given file/line. Useful for loops where the 'for' line
+// could be split amongst 2 PCs.
+func (lineInfo *DebugLineInfo) AllPCsForFileLine(f string, l int) (pcs []uint64) {
+	if lineInfo == nil {
+		return nil
+	}
+
+	var (
+		lastAddr uint64
+		sm       = newStateMachine(lineInfo, lineInfo.Instructions)
+	)
+
+	for {
+		if err := sm.next(); err != nil {
+			if lineInfo.Logf != nil {
+				lineInfo.Logf("AllPCsForFileLine error: %v", err)
+			}
+			break
+		}
+		if sm.line == l && sm.file == f && sm.address != lastAddr && sm.isStmt && sm.valid {
+			pcs = append(pcs, sm.address)
+			lastAddr = sm.address
+		}
+	}
+	return
+}
+
+var NoSourceError = errors.New("no source available")
+
+// AllPCsBetween returns all PC addresses between begin and end (including both begin and end) that have the is_stmt flag set and do not belong to excludeFile:excludeLine
+func (lineInfo *DebugLineInfo) AllPCsBetween(begin, end uint64, excludeFile string, excludeLine int) ([]uint64, error) {
+	if lineInfo == nil {
+		return nil, NoSourceError
+	}
+
+	var (
+		pcs      []uint64
+		lastaddr uint64
+		sm       = newStateMachine(lineInfo, lineInfo.Instructions)
+	)
+
+	for {
+		if err := sm.next(); err != nil {
+			if lineInfo.Logf != nil {
+				lineInfo.Logf("AllPCsBetween error: %v", err)
+			}
+			break
+		}
+		if !sm.valid {
+			continue
+		}
+		if sm.address > end {
+			break
+		}
+		if (sm.address >= begin && sm.address > lastaddr) && sm.isStmt && ((sm.file != excludeFile) || (sm.line != excludeLine)) {
+			lastaddr = sm.address
+			pcs = append(pcs, sm.address)
+		}
+	}
+	return pcs, nil
+}
+
+// copy returns a copy of this state machine, running the returned state
+// machine will not affect sm.
+func (sm *StateMachine) copy() *StateMachine {
+	var r StateMachine
+	r = *sm
+	r.buf = bytes.NewBuffer(sm.buf.Bytes())
+	return &r
+}
+
+func (lineInfo *DebugLineInfo) stateMachineForEntry(basePC uint64) (sm *StateMachine) {
+	sm = lineInfo.stateMachineCache[basePC]
+	if sm == nil {
+		sm = newStateMachine(lineInfo, lineInfo.Instructions)
+		sm.PCToLine(basePC)
+		lineInfo.stateMachineCache[basePC] = sm
+	}
+	sm = sm.copy()
+	return
+}
+
+// PCToLine returns the filename and line number associated with pc.
+// If pc isn't found inside lineInfo's table it will return the filename and
+// line number associated with the closest PC address preceding pc.
+// basePC will be used for caching, it's normally the entry point for the
+// function containing pc.
+func (lineInfo *DebugLineInfo) PCToLine(basePC, pc uint64) (string, int) {
+	if lineInfo == nil {
+		return "", 0
+	}
+	if basePC > pc {
+		panic(fmt.Errorf("basePC after pc %#x %#x", basePC, pc))
+	}
+
+	var sm *StateMachine
+	if basePC == 0 {
+		sm = newStateMachine(lineInfo, lineInfo.Instructions)
+	} else {
+		// Try to use the last state machine that we used for this function, if
+		// there isn't one or it's already past pc try to clone the cached state
+		// machine stopped at the entry point of the function.
+		// As a last resort start from the start of the debug_line section.
+		sm = lineInfo.lastMachineCache[basePC]
+		if sm == nil || sm.lastAddress > pc {
+			sm = lineInfo.stateMachineForEntry(basePC)
+			lineInfo.lastMachineCache[basePC] = sm
+		}
+	}
+
+	file, line, _ := sm.PCToLine(pc)
+	return file, line
+}
+
+func (sm *StateMachine) PCToLine(pc uint64) (string, int, bool) {
+	if !sm.started {
+		if err := sm.next(); err != nil {
+			if sm.dbl.Logf != nil {
+				sm.dbl.Logf("PCToLine error: %v", err)
+			}
+			return "", 0, false
+		}
+	}
+	if sm.lastAddress > pc {
+		return "", 0, false
+	}
+	for {
+		if sm.valid {
+			if sm.address > pc {
+				return sm.lastFile, sm.lastLine, true
+			}
+			if sm.address == pc {
+				return sm.file, sm.line, true
+			}
+		}
+		if err := sm.next(); err != nil {
+			if sm.dbl.Logf != nil {
+				sm.dbl.Logf("PCToLine error: %v", err)
+			}
+			break
+		}
+	}
+	if sm.valid {
+		return sm.file, sm.line, true
+	}
+	return "", 0, false
+}
+
+// LineToPC returns the first PC address associated with filename:lineno.
+func (lineInfo *DebugLineInfo) LineToPC(filename string, lineno int) uint64 {
+	if lineInfo == nil {
+		return 0
+	}
+
+	sm := newStateMachine(lineInfo, lineInfo.Instructions)
+
+	// if no instruction marked is_stmt is found fallback to the first
+	// instruction assigned to the filename:line.
+	var fallbackPC uint64
+
+	for {
+		if err := sm.next(); err != nil {
+			if lineInfo.Logf != nil && err != io.EOF {
+				lineInfo.Logf("LineToPC error: %v", err)
+			}
+			break
+		}
+		if sm.line == lineno && sm.file == filename && sm.valid {
+			if sm.isStmt {
+				return sm.address
+			} else if fallbackPC == 0 {
+				fallbackPC = sm.address
+			}
+		}
+	}
+	return fallbackPC
+}
+
+// PrologueEndPC returns the first PC address marked as prologue_end in the half open interval [start, end)
+func (lineInfo *DebugLineInfo) PrologueEndPC(start, end uint64) (pc uint64, file string, line int, ok bool) {
+	sm := lineInfo.stateMachineForEntry(start)
+	for {
+		if sm.valid {
+			if sm.address >= end {
+				return 0, "", 0, false
+			}
+			if sm.prologueEnd {
+				return sm.address, sm.file, sm.line, true
+			}
+		}
+		if err := sm.next(); err != nil {
+			if lineInfo.Logf != nil {
+				lineInfo.Logf("PrologueEnd error: %v", err)
+			}
+			return 0, "", 0, false
+		}
+	}
+}
+
+func (sm *StateMachine) next() error {
+	sm.started = true
+	if sm.valid {
+		sm.lastAddress, sm.lastFile, sm.lastLine = sm.address, sm.file, sm.line
+
+		// valid is set by either a special opcode or a DW_LNS_copy, in both cases
+		// we need to reset basic_block, prologue_end and epilogue_begin
+		sm.basicBlock = false
+		sm.prologueEnd = false
+		sm.epilogueBegin = false
+	}
+	if sm.endSeq {
+		sm.endSeq = false
+		sm.file = sm.dbl.FileNames[0].Path
+		sm.line = 1
+		sm.column = 0
+		sm.isStmt = sm.dbl.Prologue.InitialIsStmt == uint8(1)
+		sm.basicBlock = false
+	}
+	b, err := sm.buf.ReadByte()
+	if err != nil {
+		return err
+	}
+	if b < sm.dbl.Prologue.OpcodeBase {
+		if int(b) < len(sm.opcodes) {
+			sm.valid = false
+			sm.opcodes[b](sm, sm.buf)
+		} else {
+			// unimplemented standard opcode, read the number of arguments specified
+			// in the prologue and do nothing with them
+			opnum := sm.dbl.Prologue.StdOpLengths[b-1]
+			for i := 0; i < int(opnum); i++ {
+				util.DecodeSLEB128(sm.buf)
+			}
+			fmt.Printf("unknown opcode\n")
+		}
+	} else {
+		execSpecialOpcode(sm, b)
+	}
+	return nil
+}
+
+func execSpecialOpcode(sm *StateMachine, instr byte) {
+	var (
+		opcode  = uint8(instr)
+		decoded = opcode - sm.dbl.Prologue.OpcodeBase
+	)
+
+	sm.lastDelta = int(sm.dbl.Prologue.LineBase + int8(decoded%sm.dbl.Prologue.LineRange))
+	sm.line += sm.lastDelta
+	sm.address += uint64(decoded/sm.dbl.Prologue.LineRange) * uint64(sm.dbl.Prologue.MinInstrLength)
+	sm.valid = true
+}
+
+func execExtendedOpcode(sm *StateMachine, buf *bytes.Buffer) {
+	_, _ = util.DecodeULEB128(buf)
+	b, _ := buf.ReadByte()
+	if fn, ok := extendedopcodes[b]; ok {
+		fn(sm, buf)
+	}
+}
+
+func copyfn(sm *StateMachine, buf *bytes.Buffer) {
+	sm.valid = true
+}
+
+func advancepc(sm *StateMachine, buf *bytes.Buffer) {
+	addr, _ := util.DecodeULEB128(buf)
+	sm.address += addr * uint64(sm.dbl.Prologue.MinInstrLength)
+}
+
+func advanceline(sm *StateMachine, buf *bytes.Buffer) {
+	line, _ := util.DecodeSLEB128(buf)
+	sm.line += int(line)
+	sm.lastDelta = int(line)
+}
+
+func setfile(sm *StateMachine, buf *bytes.Buffer) {
+	i, _ := util.DecodeULEB128(buf)
+	if i-1 < uint64(len(sm.dbl.FileNames)) {
+		sm.file = sm.dbl.FileNames[i-1].Path
+	} else {
+		j := (i - 1) - uint64(len(sm.dbl.FileNames))
+		if j < uint64(len(sm.definedFiles)) {
+			sm.file = sm.definedFiles[j].Path
+		} else {
+			sm.file = ""
+		}
+	}
+}
+
+func setcolumn(sm *StateMachine, buf *bytes.Buffer) {
+	c, _ := util.DecodeULEB128(buf)
+	sm.column = uint(c)
+}
+
+func negatestmt(sm *StateMachine, buf *bytes.Buffer) {
+	sm.isStmt = !sm.isStmt
+}
+
+func setbasicblock(sm *StateMachine, buf *bytes.Buffer) {
+	sm.basicBlock = true
+}
+
+func constaddpc(sm *StateMachine, buf *bytes.Buffer) {
+	sm.address += uint64((255-sm.dbl.Prologue.OpcodeBase)/sm.dbl.Prologue.LineRange) * uint64(sm.dbl.Prologue.MinInstrLength)
+}
+
+func fixedadvancepc(sm *StateMachine, buf *bytes.Buffer) {
+	var operand uint16
+	binary.Read(buf, binary.LittleEndian, &operand)
+
+	sm.address += uint64(operand)
+}
+
+func endsequence(sm *StateMachine, buf *bytes.Buffer) {
+	sm.endSeq = true
+	sm.valid = true
+}
+
+func setaddress(sm *StateMachine, buf *bytes.Buffer) {
+	var addr uint64
+
+	binary.Read(buf, binary.LittleEndian, &addr)
+
+	sm.address = addr + sm.dbl.staticBase
+}
+
+func definefile(sm *StateMachine, buf *bytes.Buffer) {
+	entry := readFileEntry(sm.dbl, sm.buf, false)
+	sm.definedFiles = append(sm.definedFiles, entry)
+}
+
+func prologueend(sm *StateMachine, buf *bytes.Buffer) {
+	sm.prologueEnd = true
+}
+
+func epiloguebegin(sm *StateMachine, buf *bytes.Buffer) {
+	sm.epilogueBegin = true
+}

vendor/github.com/derekparker/delve/pkg/dwarf/op/op.go

@@ -0,0 +1,197 @@
+package op
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"io"
+
+	"github.com/derekparker/delve/pkg/dwarf/util"
+)
+
+type Opcode byte
+
+//go:generate go run ../../../scripts/gen-opcodes.go opcodes.table opcodes.go
+
+type stackfn func(Opcode, *context) error
+
+type context struct {
+	buf    *bytes.Buffer
+	stack  []int64
+	pieces []Piece
+	reg    bool
+
+	DwarfRegisters
+}
+
+// Piece is a piece of memory stored either at an address or in a register.
+type Piece struct {
+	Size       int
+	Addr       int64
+	RegNum     uint64
+	IsRegister bool
+}
+
+// ExecuteStackProgram executes a DWARF location expression and returns
+// either an address (int64), or a slice of Pieces for location expressions
+// that don't evaluate to an address (such as register and composite expressions).
+func ExecuteStackProgram(regs DwarfRegisters, instructions []byte) (int64, []Piece, error) {
+	ctxt := &context{
+		buf:            bytes.NewBuffer(instructions),
+		stack:          make([]int64, 0, 3),
+		DwarfRegisters: regs,
+	}
+
+	for {
+		opcodeByte, err := ctxt.buf.ReadByte()
+		if err != nil {
+			break
+		}
+		opcode := Opcode(opcodeByte)
+		if ctxt.reg && opcode != DW_OP_piece {
+			break
+		}
+		fn, ok := oplut[opcode]
+		if !ok {
+			return 0, nil, fmt.Errorf("invalid instruction %#v", opcode)
+		}
+
+		err = fn(opcode, ctxt)
+		if err != nil {
+			return 0, nil, err
+		}
+	}
+
+	if ctxt.pieces != nil {
+		return 0, ctxt.pieces, nil
+	}
+
+	if len(ctxt.stack) == 0 {
+		return 0, nil, errors.New("empty OP stack")
+	}
+
+	return ctxt.stack[len(ctxt.stack)-1], nil, nil
+}
+
+// PrettyPrint prints instructions to out.
+func PrettyPrint(out io.Writer, instructions []byte) {
+	in := bytes.NewBuffer(instructions)
+
+	for {
+		opcode, err := in.ReadByte()
+		if err != nil {
+			break
+		}
+		if name, hasname := opcodeName[Opcode(opcode)]; hasname {
+			io.WriteString(out, name)
+			out.Write([]byte{' '})
+		} else {
+			fmt.Fprintf(out, "%#x ", opcode)
+		}
+		for _, arg := range opcodeArgs[Opcode(opcode)] {
+			switch arg {
+			case 's':
+				n, _ := util.DecodeSLEB128(in)
+				fmt.Fprintf(out, "%#x ", n)
+			case 'u':
+				n, _ := util.DecodeULEB128(in)
+				fmt.Fprintf(out, "%#x ", n)
+			case '1':
+				var x uint8
+				binary.Read(in, binary.LittleEndian, &x)
+				fmt.Fprintf(out, "%#x ", x)
+			case '2':
+				var x uint16
+				binary.Read(in, binary.LittleEndian, &x)
+				fmt.Fprintf(out, "%#x ", x)
+			case '4':
+				var x uint32
+				binary.Read(in, binary.LittleEndian, &x)
+				fmt.Fprintf(out, "%#x ", x)
+			case '8':
+				var x uint64
+				binary.Read(in, binary.LittleEndian, &x)
+				fmt.Fprintf(out, "%#x ", x)
+			case 'B':
+				sz, _ := util.DecodeULEB128(in)
+				data := make([]byte, sz)
+				sz2, _ := in.Read(data)
+				data = data[:sz2]
+				fmt.Fprintf(out, "%d [%x] ", sz, data)
+			}
+		}
+	}
+}
+
+func callframecfa(opcode Opcode, ctxt *context) error {
+	if ctxt.CFA == 0 {
+		return fmt.Errorf("Could not retrieve CFA for current PC")
+	}
+	ctxt.stack = append(ctxt.stack, int64(ctxt.CFA))
+	return nil
+}
+
+func addr(opcode Opcode, ctxt *context) error {
+	ctxt.stack = append(ctxt.stack, int64(binary.LittleEndian.Uint64(ctxt.buf.Next(8))+ctxt.StaticBase))
+	return nil
+}
+
+func plus(opcode Opcode, ctxt *context) error {
+	var (
+		slen   = len(ctxt.stack)
+		digits = ctxt.stack[slen-2 : slen]
+		st     = ctxt.stack[:slen-2]
+	)
+
+	ctxt.stack = append(st, digits[0]+digits[1])
+	return nil
+}
+
+func plusuconsts(opcode Opcode, ctxt *context) error {
+	slen := len(ctxt.stack)
+	num, _ := util.DecodeULEB128(ctxt.buf)
+	ctxt.stack[slen-1] = ctxt.stack[slen-1] + int64(num)
+	return nil
+}
+
+func consts(opcode Opcode, ctxt *context) error {
+	num, _ := util.DecodeSLEB128(ctxt.buf)
+	ctxt.stack = append(ctxt.stack, num)
+	return nil
+}
+
+func framebase(opcode Opcode, ctxt *context) error {
+	num, _ := util.DecodeSLEB128(ctxt.buf)
+	ctxt.stack = append(ctxt.stack, ctxt.FrameBase+num)
+	return nil
+}
+
+func register(opcode Opcode, ctxt *context) error {
+	ctxt.reg = true
+	if opcode == DW_OP_regx {
+		n, _ := util.DecodeSLEB128(ctxt.buf)
+		ctxt.pieces = append(ctxt.pieces, Piece{IsRegister: true, RegNum: uint64(n)})
+	} else {
+		ctxt.pieces = append(ctxt.pieces, Piece{IsRegister: true, RegNum: uint64(opcode - DW_OP_reg0)})
+	}
+	return nil
+}
+
+func piece(opcode Opcode, ctxt *context) error {
+	sz, _ := util.DecodeULEB128(ctxt.buf)
+	if ctxt.reg {
+		ctxt.reg = false
+		ctxt.pieces[len(ctxt.pieces)-1].Size = int(sz)
+		return nil
+	}
+
+	if len(ctxt.stack) == 0 {
+		return errors.New("empty OP stack")
+	}
+
+	addr := ctxt.stack[len(ctxt.stack)-1]
+	ctxt.pieces = append(ctxt.pieces, Piece{Size: int(sz), Addr: addr})
+	ctxt.stack = ctxt.stack[:0]
+	return nil
+}

vendor/github.com/derekparker/delve/pkg/dwarf/op/opcodes.go

@@ -0,0 +1,515 @@
+// THIS FILE IS AUTOGENERATED, EDIT opcodes.table INSTEAD
+
+package op
+
+const (
+	DW_OP_addr                Opcode = 0x03
+	DW_OP_deref               Opcode = 0x06
+	DW_OP_const1u             Opcode = 0x08
+	DW_OP_const1s             Opcode = 0x09
+	DW_OP_const2u             Opcode = 0x0a
+	DW_OP_const2s             Opcode = 0x0b
+	DW_OP_const4u             Opcode = 0x0c
+	DW_OP_const4s             Opcode = 0x0d
+	DW_OP_const8u             Opcode = 0x0e
+	DW_OP_const8s             Opcode = 0x0f
+	DW_OP_constu              Opcode = 0x10
+	DW_OP_consts              Opcode = 0x11
+	DW_OP_dup                 Opcode = 0x12
+	DW_OP_drop                Opcode = 0x13
+	DW_OP_over                Opcode = 0x14
+	DW_OP_pick                Opcode = 0x15
+	DW_OP_swap                Opcode = 0x16
+	DW_OP_rot                 Opcode = 0x17
+	DW_OP_xderef              Opcode = 0x18
+	DW_OP_abs                 Opcode = 0x19
+	DW_OP_and                 Opcode = 0x1a
+	DW_OP_div                 Opcode = 0x1b
+	DW_OP_minus               Opcode = 0x1c
+	DW_OP_mod                 Opcode = 0x1d
+	DW_OP_mul                 Opcode = 0x1e
+	DW_OP_neg                 Opcode = 0x1f
+	DW_OP_not                 Opcode = 0x20
+	DW_OP_or                  Opcode = 0x21
+	DW_OP_plus                Opcode = 0x22
+	DW_OP_plus_uconst         Opcode = 0x23
+	DW_OP_shl                 Opcode = 0x24
+	DW_OP_shr                 Opcode = 0x25
+	DW_OP_shra                Opcode = 0x26
+	DW_OP_xor                 Opcode = 0x27
+	DW_OP_bra                 Opcode = 0x28
+	DW_OP_eq                  Opcode = 0x29
+	DW_OP_ge                  Opcode = 0x2a
+	DW_OP_gt                  Opcode = 0x2b
+	DW_OP_le                  Opcode = 0x2c
+	DW_OP_lt                  Opcode = 0x2d
+	DW_OP_ne                  Opcode = 0x2e
+	DW_OP_skip                Opcode = 0x2f
+	DW_OP_lit0                Opcode = 0x30
+	DW_OP_lit1                Opcode = 0x31
+	DW_OP_lit2                Opcode = 0x32
+	DW_OP_lit3                Opcode = 0x33
+	DW_OP_lit4                Opcode = 0x34
+	DW_OP_lit5                Opcode = 0x35
+	DW_OP_lit6                Opcode = 0x36
+	DW_OP_lit7                Opcode = 0x37
+	DW_OP_lit8                Opcode = 0x38
+	DW_OP_lit9                Opcode = 0x39
+	DW_OP_lit10               Opcode = 0x3a
+	DW_OP_lit11               Opcode = 0x3b
+	DW_OP_lit12               Opcode = 0x3c
+	DW_OP_lit13               Opcode = 0x3d
+	DW_OP_lit14               Opcode = 0x3e
+	DW_OP_lit15               Opcode = 0x3f
+	DW_OP_lit16               Opcode = 0x40
+	DW_OP_lit17               Opcode = 0x41
+	DW_OP_lit18               Opcode = 0x42
+	DW_OP_lit19               Opcode = 0x43
+	DW_OP_lit20               Opcode = 0x44
+	DW_OP_lit21               Opcode = 0x45
+	DW_OP_lit22               Opcode = 0x46
+	DW_OP_lit23               Opcode = 0x47
+	DW_OP_lit24               Opcode = 0x48
+	DW_OP_lit25               Opcode = 0x49
+	DW_OP_lit26               Opcode = 0x4a
+	DW_OP_lit27               Opcode = 0x4b
+	DW_OP_lit28               Opcode = 0x4c
+	DW_OP_lit29               Opcode = 0x4d
+	DW_OP_lit30               Opcode = 0x4e
+	DW_OP_lit31               Opcode = 0x4f
+	DW_OP_reg0                Opcode = 0x50
+	DW_OP_reg1                Opcode = 0x51
+	DW_OP_reg2                Opcode = 0x52
+	DW_OP_reg3                Opcode = 0x53
+	DW_OP_reg4                Opcode = 0x54
+	DW_OP_reg5                Opcode = 0x55
+	DW_OP_reg6                Opcode = 0x56
+	DW_OP_reg7                Opcode = 0x57
+	DW_OP_reg8                Opcode = 0x58
+	DW_OP_reg9                Opcode = 0x59
+	DW_OP_reg10               Opcode = 0x5a
+	DW_OP_reg11               Opcode = 0x5b
+	DW_OP_reg12               Opcode = 0x5c
+	DW_OP_reg13               Opcode = 0x5d
+	DW_OP_reg14               Opcode = 0x5e
+	DW_OP_reg15               Opcode = 0x5f
+	DW_OP_reg16               Opcode = 0x60
+	DW_OP_reg17               Opcode = 0x61
+	DW_OP_reg18               Opcode = 0x62
+	DW_OP_reg19               Opcode = 0x63
+	DW_OP_reg20               Opcode = 0x64
+	DW_OP_reg21               Opcode = 0x65
+	DW_OP_reg22               Opcode = 0x66
+	DW_OP_reg23               Opcode = 0x67
+	DW_OP_reg24               Opcode = 0x68
+	DW_OP_reg25               Opcode = 0x69
+	DW_OP_reg26               Opcode = 0x6a
+	DW_OP_reg27               Opcode = 0x6b
+	DW_OP_reg28               Opcode = 0x6c
+	DW_OP_reg29               Opcode = 0x6d
+	DW_OP_reg30               Opcode = 0x6e
+	DW_OP_reg31               Opcode = 0x6f
+	DW_OP_breg0               Opcode = 0x70
+	DW_OP_breg1               Opcode = 0x71
+	DW_OP_breg2               Opcode = 0x72
+	DW_OP_breg3               Opcode = 0x73
+	DW_OP_breg4               Opcode = 0x74
+	DW_OP_breg5               Opcode = 0x75
+	DW_OP_breg6               Opcode = 0x76
+	DW_OP_breg7               Opcode = 0x77
+	DW_OP_breg8               Opcode = 0x78
+	DW_OP_breg9               Opcode = 0x79
+	DW_OP_breg10              Opcode = 0x7a
+	DW_OP_breg11              Opcode = 0x7b
+	DW_OP_breg12              Opcode = 0x7c
+	DW_OP_breg13              Opcode = 0x7d
+	DW_OP_breg14              Opcode = 0x7e
+	DW_OP_breg15              Opcode = 0x7f
+	DW_OP_breg16              Opcode = 0x80
+	DW_OP_breg17              Opcode = 0x81
+	DW_OP_breg18              Opcode = 0x82
+	DW_OP_breg19              Opcode = 0x83
+	DW_OP_breg20              Opcode = 0x84
+	DW_OP_breg21              Opcode = 0x85
+	DW_OP_breg22              Opcode = 0x86
+	DW_OP_breg23              Opcode = 0x87
+	DW_OP_breg24              Opcode = 0x88
+	DW_OP_breg25              Opcode = 0x89
+	DW_OP_breg26              Opcode = 0x8a
+	DW_OP_breg27              Opcode = 0x8b
+	DW_OP_breg28              Opcode = 0x8c
+	DW_OP_breg29              Opcode = 0x8d
+	DW_OP_breg30              Opcode = 0x8e
+	DW_OP_breg31              Opcode = 0x8f
+	DW_OP_regx                Opcode = 0x90
+	DW_OP_fbreg               Opcode = 0x91
+	DW_OP_bregx               Opcode = 0x92
+	DW_OP_piece               Opcode = 0x93
+	DW_OP_deref_size          Opcode = 0x94
+	DW_OP_xderef_size         Opcode = 0x95
+	DW_OP_nop                 Opcode = 0x96
+	DW_OP_push_object_address Opcode = 0x97
+	DW_OP_call2               Opcode = 0x98
+	DW_OP_call4               Opcode = 0x99
+	DW_OP_call_ref            Opcode = 0x9a
+	DW_OP_form_tls_address    Opcode = 0x9b
+	DW_OP_call_frame_cfa      Opcode = 0x9c
+	DW_OP_bit_piece           Opcode = 0x9d
+	DW_OP_implicit_value      Opcode = 0x9e
+	DW_OP_stack_value         Opcode = 0x9f
+)
+
+var opcodeName = map[Opcode]string{
+	DW_OP_addr:                "DW_OP_addr",
+	DW_OP_deref:               "DW_OP_deref",
+	DW_OP_const1u:             "DW_OP_const1u",
+	DW_OP_const1s:             "DW_OP_const1s",
+	DW_OP_const2u:             "DW_OP_const2u",
+	DW_OP_const2s:             "DW_OP_const2s",
+	DW_OP_const4u:             "DW_OP_const4u",
+	DW_OP_const4s:             "DW_OP_const4s",
+	DW_OP_const8u:             "DW_OP_const8u",
+	DW_OP_const8s:             "DW_OP_const8s",
+	DW_OP_constu:              "DW_OP_constu",
+	DW_OP_consts:              "DW_OP_consts",
+	DW_OP_dup:                 "DW_OP_dup",
+	DW_OP_drop:                "DW_OP_drop",
+	DW_OP_over:                "DW_OP_over",
+	DW_OP_pick:                "DW_OP_pick",
+	DW_OP_swap:                "DW_OP_swap",
+	DW_OP_rot:                 "DW_OP_rot",
+	DW_OP_xderef:              "DW_OP_xderef",
+	DW_OP_abs:                 "DW_OP_abs",
+	DW_OP_and:                 "DW_OP_and",
+	DW_OP_div:                 "DW_OP_div",
+	DW_OP_minus:               "DW_OP_minus",
+	DW_OP_mod:                 "DW_OP_mod",
+	DW_OP_mul:                 "DW_OP_mul",
+	DW_OP_neg:                 "DW_OP_neg",
+	DW_OP_not:                 "DW_OP_not",
+	DW_OP_or:                  "DW_OP_or",
+	DW_OP_plus:                "DW_OP_plus",
+	DW_OP_plus_uconst:         "DW_OP_plus_uconst",
+	DW_OP_shl:                 "DW_OP_shl",
+	DW_OP_shr:                 "DW_OP_shr",
+	DW_OP_shra:                "DW_OP_shra",
+	DW_OP_xor:                 "DW_OP_xor",
+	DW_OP_bra:                 "DW_OP_bra",
+	DW_OP_eq:                  "DW_OP_eq",
+	DW_OP_ge:                  "DW_OP_ge",
+	DW_OP_gt:                  "DW_OP_gt",
+	DW_OP_le:                  "DW_OP_le",
+	DW_OP_lt:                  "DW_OP_lt",
+	DW_OP_ne:                  "DW_OP_ne",
+	DW_OP_skip:                "DW_OP_skip",
+	DW_OP_lit0:                "DW_OP_lit0",
+	DW_OP_lit1:                "DW_OP_lit1",
+	DW_OP_lit2:                "DW_OP_lit2",
+	DW_OP_lit3:                "DW_OP_lit3",
+	DW_OP_lit4:                "DW_OP_lit4",
+	DW_OP_lit5:                "DW_OP_lit5",
+	DW_OP_lit6:                "DW_OP_lit6",
+	DW_OP_lit7:                "DW_OP_lit7",
+	DW_OP_lit8:                "DW_OP_lit8",
+	DW_OP_lit9:                "DW_OP_lit9",
+	DW_OP_lit10:               "DW_OP_lit10",
+	DW_OP_lit11:               "DW_OP_lit11",
+	DW_OP_lit12:               "DW_OP_lit12",
+	DW_OP_lit13:               "DW_OP_lit13",
+	DW_OP_lit14:               "DW_OP_lit14",
+	DW_OP_lit15:               "DW_OP_lit15",
+	DW_OP_lit16:               "DW_OP_lit16",
+	DW_OP_lit17:               "DW_OP_lit17",
+	DW_OP_lit18:               "DW_OP_lit18",
+	DW_OP_lit19:               "DW_OP_lit19",
+	DW_OP_lit20:               "DW_OP_lit20",
+	DW_OP_lit21:               "DW_OP_lit21",
+	DW_OP_lit22:               "DW_OP_lit22",
+	DW_OP_lit23:               "DW_OP_lit23",
+	DW_OP_lit24:               "DW_OP_lit24",
+	DW_OP_lit25:               "DW_OP_lit25",
+	DW_OP_lit26:               "DW_OP_lit26",
+	DW_OP_lit27:               "DW_OP_lit27",
+	DW_OP_lit28:               "DW_OP_lit28",
+	DW_OP_lit29:               "DW_OP_lit29",
+	DW_OP_lit30:               "DW_OP_lit30",
+	DW_OP_lit31:               "DW_OP_lit31",
+	DW_OP_reg0:                "DW_OP_reg0",
+	DW_OP_reg1:                "DW_OP_reg1",
+	DW_OP_reg2:                "DW_OP_reg2",
+	DW_OP_reg3:                "DW_OP_reg3",
+	DW_OP_reg4:                "DW_OP_reg4",
+	DW_OP_reg5:                "DW_OP_reg5",
+	DW_OP_reg6:                "DW_OP_reg6",
+	DW_OP_reg7:                "DW_OP_reg7",
+	DW_OP_reg8:                "DW_OP_reg8",
+	DW_OP_reg9:                "DW_OP_reg9",
+	DW_OP_reg10:               "DW_OP_reg10",
+	DW_OP_reg11:               "DW_OP_reg11",
+	DW_OP_reg12:               "DW_OP_reg12",
+	DW_OP_reg13:               "DW_OP_reg13",
+	DW_OP_reg14:               "DW_OP_reg14",
+	DW_OP_reg15:               "DW_OP_reg15",
+	DW_OP_reg16:               "DW_OP_reg16",
+	DW_OP_reg17:               "DW_OP_reg17",
+	DW_OP_reg18:               "DW_OP_reg18",
+	DW_OP_reg19:               "DW_OP_reg19",
+	DW_OP_reg20:               "DW_OP_reg20",
+	DW_OP_reg21:               "DW_OP_reg21",
+	DW_OP_reg22:               "DW_OP_reg22",
+	DW_OP_reg23:               "DW_OP_reg23",
+	DW_OP_reg24:               "DW_OP_reg24",
+	DW_OP_reg25:               "DW_OP_reg25",
+	DW_OP_reg26:               "DW_OP_reg26",
+	DW_OP_reg27:               "DW_OP_reg27",
+	DW_OP_reg28:               "DW_OP_reg28",
+	DW_OP_reg29:               "DW_OP_reg29",
+	DW_OP_reg30:               "DW_OP_reg30",
+	DW_OP_reg31:               "DW_OP_reg31",
+	DW_OP_breg0:               "DW_OP_breg0",
+	DW_OP_breg1:               "DW_OP_breg1",
+	DW_OP_breg2:               "DW_OP_breg2",
+	DW_OP_breg3:               "DW_OP_breg3",
+	DW_OP_breg4:               "DW_OP_breg4",
+	DW_OP_breg5:               "DW_OP_breg5",
+	DW_OP_breg6:               "DW_OP_breg6",
+	DW_OP_breg7:               "DW_OP_breg7",
+	DW_OP_breg8:               "DW_OP_breg8",
+	DW_OP_breg9:               "DW_OP_breg9",
+	DW_OP_breg10:              "DW_OP_breg10",
+	DW_OP_breg11:              "DW_OP_breg11",
+	DW_OP_breg12:              "DW_OP_breg12",
+	DW_OP_breg13:              "DW_OP_breg13",
+	DW_OP_breg14:              "DW_OP_breg14",
+	DW_OP_breg15:              "DW_OP_breg15",
+	DW_OP_breg16:              "DW_OP_breg16",
+	DW_OP_breg17:              "DW_OP_breg17",
+	DW_OP_breg18:              "DW_OP_breg18",
+	DW_OP_breg19:              "DW_OP_breg19",
+	DW_OP_breg20:              "DW_OP_breg20",
+	DW_OP_breg21:              "DW_OP_breg21",
+	DW_OP_breg22:              "DW_OP_breg22",
+	DW_OP_breg23:              "DW_OP_breg23",
+	DW_OP_breg24:              "DW_OP_breg24",
+	DW_OP_breg25:              "DW_OP_breg25",
+	DW_OP_breg26:              "DW_OP_breg26",
+	DW_OP_breg27:              "DW_OP_breg27",
+	DW_OP_breg28:              "DW_OP_breg28",
+	DW_OP_breg29:              "DW_OP_breg29",
+	DW_OP_breg30:              "DW_OP_breg30",
+	DW_OP_breg31:              "DW_OP_breg31",
+	DW_OP_regx:                "DW_OP_regx",
+	DW_OP_fbreg:               "DW_OP_fbreg",
+	DW_OP_bregx:               "DW_OP_bregx",
+	DW_OP_piece:               "DW_OP_piece",
+	DW_OP_deref_size:          "DW_OP_deref_size",
+	DW_OP_xderef_size:         "DW_OP_xderef_size",
+	DW_OP_nop:                 "DW_OP_nop",
+	DW_OP_push_object_address: "DW_OP_push_object_address",
+	DW_OP_call2:               "DW_OP_call2",
+	DW_OP_call4:               "DW_OP_call4",
+	DW_OP_call_ref:            "DW_OP_call_ref",
+	DW_OP_form_tls_address:    "DW_OP_form_tls_address",
+	DW_OP_call_frame_cfa:      "DW_OP_call_frame_cfa",
+	DW_OP_bit_piece:           "DW_OP_bit_piece",
+	DW_OP_implicit_value:      "DW_OP_implicit_value",
+	DW_OP_stack_value:         "DW_OP_stack_value",
+}
+var opcodeArgs = map[Opcode]string{
+	DW_OP_addr:                "8",
+	DW_OP_deref:               "",
+	DW_OP_const1u:             "1",
+	DW_OP_const1s:             "1",
+	DW_OP_const2u:             "2",
+	DW_OP_const2s:             "2",
+	DW_OP_const4u:             "4",
+	DW_OP_const4s:             "4",
+	DW_OP_const8u:             "8",
+	DW_OP_const8s:             "8",
+	DW_OP_constu:              "u",
+	DW_OP_consts:              "s",
+	DW_OP_dup:                 "",
+	DW_OP_drop:                "",
+	DW_OP_over:                "",
+	DW_OP_pick:                "",
+	DW_OP_swap:                "",
+	DW_OP_rot:                 "",
+	DW_OP_xderef:              "",
+	DW_OP_abs:                 "",
+	DW_OP_and:                 "",
+	DW_OP_div:                 "",
+	DW_OP_minus:               "",
+	DW_OP_mod:                 "",
+	DW_OP_mul:                 "",
+	DW_OP_neg:                 "",
+	DW_OP_not:                 "",
+	DW_OP_or:                  "",
+	DW_OP_plus:                "",
+	DW_OP_plus_uconst:         "u",
+	DW_OP_shl:                 "",
+	DW_OP_shr:                 "",
+	DW_OP_shra:                "",
+	DW_OP_xor:                 "",
+	DW_OP_bra:                 "2",
+	DW_OP_eq:                  "",
+	DW_OP_ge:                  "",
+	DW_OP_gt:                  "",
+	DW_OP_le:                  "",
+	DW_OP_lt:                  "",
+	DW_OP_ne:                  "",
+	DW_OP_skip:                "2",
+	DW_OP_lit0:                "",
+	DW_OP_lit1:                "",
+	DW_OP_lit2:                "",
+	DW_OP_lit3:                "",
+	DW_OP_lit4:                "",
+	DW_OP_lit5:                "",
+	DW_OP_lit6:                "",
+	DW_OP_lit7:                "",
+	DW_OP_lit8:                "",
+	DW_OP_lit9:                "",
+	DW_OP_lit10:               "",
+	DW_OP_lit11:               "",
+	DW_OP_lit12:               "",
+	DW_OP_lit13:               "",
+	DW_OP_lit14:               "",
+	DW_OP_lit15:               "",
+	DW_OP_lit16:               "",
+	DW_OP_lit17:               "",
+	DW_OP_lit18:               "",
+	DW_OP_lit19:               "",
+	DW_OP_lit20:               "",
+	DW_OP_lit21:               "",
+	DW_OP_lit22:               "",
+	DW_OP_lit23:               "",
+	DW_OP_lit24:               "",
+	DW_OP_lit25:               "",
+	DW_OP_lit26:               "",
+	DW_OP_lit27:               "",
+	DW_OP_lit28:               "",
+	DW_OP_lit29:               "",
+	DW_OP_lit30:               "",
+	DW_OP_lit31:               "",
+	DW_OP_reg0:                "",
+	DW_OP_reg1:                "",
+	DW_OP_reg2:                "",
+	DW_OP_reg3:                "",
+	DW_OP_reg4:                "",
+	DW_OP_reg5:                "",
+	DW_OP_reg6:                "",
+	DW_OP_reg7:                "",
+	DW_OP_reg8:                "",
+	DW_OP_reg9:                "",
+	DW_OP_reg10:               "",
+	DW_OP_reg11:               "",
+	DW_OP_reg12:               "",
+	DW_OP_reg13:               "",
+	DW_OP_reg14:               "",
+	DW_OP_reg15:               "",
+	DW_OP_reg16:               "",
+	DW_OP_reg17:               "",
+	DW_OP_reg18:               "",
+	DW_OP_reg19:               "",
+	DW_OP_reg20:               "",
+	DW_OP_reg21:               "",
+	DW_OP_reg22:               "",
+	DW_OP_reg23:               "",
+	DW_OP_reg24:               "",
+	DW_OP_reg25:               "",
+	DW_OP_reg26:               "",
+	DW_OP_reg27:               "",
+	DW_OP_reg28:               "",
+	DW_OP_reg29:               "",
+	DW_OP_reg30:               "",
+	DW_OP_reg31:               "",
+	DW_OP_breg0:               "s",
+	DW_OP_breg1:               "s",
+	DW_OP_breg2:               "s",
+	DW_OP_breg3:               "s",
+	DW_OP_breg4:               "s",
+	DW_OP_breg5:               "s",
+	DW_OP_breg6:               "s",
+	DW_OP_breg7:               "s",
+	DW_OP_breg8:               "s",
+	DW_OP_breg9:               "s",
+	DW_OP_breg10:              "s",
+	DW_OP_breg11:              "s",
+	DW_OP_breg12:              "s",
+	DW_OP_breg13:              "s",
+	DW_OP_breg14:              "s",
+	DW_OP_breg15:              "s",
+	DW_OP_breg16:              "s",
+	DW_OP_breg17:              "s",
+	DW_OP_breg18:              "s",
+	DW_OP_breg19:              "s",
+	DW_OP_breg20:              "s",
+	DW_OP_breg21:              "s",
+	DW_OP_breg22:              "s",
+	DW_OP_breg23:              "s",
+	DW_OP_breg24:              "s",
+	DW_OP_breg25:              "s",
+	DW_OP_breg26:              "s",
+	DW_OP_breg27:              "s",
+	DW_OP_breg28:              "s",
+	DW_OP_breg29:              "s",
+	DW_OP_breg30:              "s",
+	DW_OP_breg31:              "s",
+	DW_OP_regx:                "s",
+	DW_OP_fbreg:               "s",
+	DW_OP_bregx:               "us",
+	DW_OP_piece:               "u",
+	DW_OP_deref_size:          "1",
+	DW_OP_xderef_size:         "1",
+	DW_OP_nop:                 "",
+	DW_OP_push_object_address: "",
+	DW_OP_call2:               "2",
+	DW_OP_call4:               "4",
+	DW_OP_call_ref:            "4",
+	DW_OP_form_tls_address:    "",
+	DW_OP_call_frame_cfa:      "",
+	DW_OP_bit_piece:           "uu",
+	DW_OP_implicit_value:      "B",
+	DW_OP_stack_value:         "",
+}
+var oplut = map[Opcode]stackfn{
+	DW_OP_addr:           addr,
+	DW_OP_consts:         consts,
+	DW_OP_plus:           plus,
+	DW_OP_plus_uconst:    plusuconsts,
+	DW_OP_reg0:           register,
+	DW_OP_reg1:           register,
+	DW_OP_reg2:           register,
+	DW_OP_reg3:           register,
+	DW_OP_reg4:           register,
+	DW_OP_reg5:           register,
+	DW_OP_reg6:           register,
+	DW_OP_reg7:           register,
+	DW_OP_reg8:           register,
+	DW_OP_reg9:           register,
+	DW_OP_reg10:          register,
+	DW_OP_reg11:          register,
+	DW_OP_reg12:          register,
+	DW_OP_reg13:          register,
+	DW_OP_reg14:          register,
+	DW_OP_reg15:          register,
+	DW_OP_reg16:          register,
+	DW_OP_reg17:          register,
+	DW_OP_reg18:          register,
+	DW_OP_reg19:          register,
+	DW_OP_reg20:          register,
+	DW_OP_reg21:          register,
+	DW_OP_reg22:          register,
+	DW_OP_reg23:          register,
+	DW_OP_reg24:          register,
+	DW_OP_reg25:          register,
+	DW_OP_reg26:          register,
+	DW_OP_reg27:          register,
+	DW_OP_reg28:          register,
+	DW_OP_reg29:          register,
+	DW_OP_reg30:          register,
+	DW_OP_reg31:          register,
+	DW_OP_regx:           register,
+	DW_OP_fbreg:          framebase,
+	DW_OP_piece:          piece,
+	DW_OP_call_frame_cfa: callframecfa,
+}

vendor/github.com/derekparker/delve/pkg/dwarf/op/opcodes.table

@@ -0,0 +1,175 @@
+// This file is used by scripts/gen-opcodes.go to generate
+// pkg/dwarf/op/opcodes.go 
+// Lines starting with // are comments and will be discarded.
+// Non empty lines contain the following tab separated fields:
+//
+//  <opcode name> <opcode code> <arguments> <function name>
+// 
+// With the last column, <function name>, being optional.
+//
+// The arguments field should contain a string with one character for each
+// argument of the opcode:
+//
+//  s		signed variable length integer
+//  u		unsigned variable length integer
+//  1		one byte unsigned integer
+//  2		two bytes unsigned integer
+//  4		four bytes unsigned integer
+//  8		eight bytes unsigned integer
+//  B		an unsigned variable length integer 'n' followed by n a block of n bytes
+
+
+DW_OP_addr	0x03	"8"	addr
+DW_OP_deref	0x06	""
+DW_OP_const1u	0x08	"1"
+DW_OP_const1s	0x09	"1"
+DW_OP_const2u	0x0a	"2"
+DW_OP_const2s	0x0b	"2"
+DW_OP_const4u	0x0c	"4"
+DW_OP_const4s	0x0d	"4"
+DW_OP_const8u	0x0e	"8"
+DW_OP_const8s	0x0f	"8"
+DW_OP_constu	0x10	"u"
+DW_OP_consts	0x11	"s"	consts
+DW_OP_dup	0x12	""
+DW_OP_drop	0x13	""
+DW_OP_over	0x14	""
+DW_OP_pick	0x15	""
+DW_OP_swap	0x16	""
+DW_OP_rot	0x17	""
+DW_OP_xderef	0x18	""
+DW_OP_abs	0x19	""
+DW_OP_and	0x1a	""
+DW_OP_div	0x1b	""
+DW_OP_minus	0x1c	""
+DW_OP_mod	0x1d	""
+DW_OP_mul	0x1e	""
+DW_OP_neg	0x1f	""
+DW_OP_not	0x20	""
+DW_OP_or	0x21	""
+DW_OP_plus	0x22	""	plus
+DW_OP_plus_uconst	0x23	"u"	plusuconsts
+DW_OP_shl	0x24	""
+DW_OP_shr	0x25	""
+DW_OP_shra	0x26	""
+DW_OP_xor	0x27	""
+DW_OP_bra	0x28	"2"
+DW_OP_eq	0x29	""
+DW_OP_ge	0x2a	""
+DW_OP_gt	0x2b	""
+DW_OP_le	0x2c	""
+DW_OP_lt	0x2d	""
+DW_OP_ne	0x2e	""
+DW_OP_skip	0x2f	"2"
+DW_OP_lit0	0x30	""
+DW_OP_lit1	0x31	""
+DW_OP_lit2	0x32	""
+DW_OP_lit3	0x33	""
+DW_OP_lit4	0x34	""
+DW_OP_lit5	0x35	""
+DW_OP_lit6	0x36	""
+DW_OP_lit7	0x37	""
+DW_OP_lit8	0x38	""
+DW_OP_lit9	0x39	""
+DW_OP_lit10	0x3a	""
+DW_OP_lit11	0x3b	""
+DW_OP_lit12	0x3c	""
+DW_OP_lit13	0x3d	""
+DW_OP_lit14	0x3e	""
+DW_OP_lit15	0x3f	""
+DW_OP_lit16	0x40	""
+DW_OP_lit17	0x41	""
+DW_OP_lit18	0x42	""
+DW_OP_lit19	0x43	""
+DW_OP_lit20	0x44	""
+DW_OP_lit21	0x45	""
+DW_OP_lit22	0x46	""
+DW_OP_lit23	0x47	""
+DW_OP_lit24	0x48	""
+DW_OP_lit25	0x49	""
+DW_OP_lit26	0x4a	""
+DW_OP_lit27	0x4b	""
+DW_OP_lit28	0x4c	""
+DW_OP_lit29	0x4d	""
+DW_OP_lit30	0x4e	""
+DW_OP_lit31	0x4f	""
+DW_OP_reg0	0x50	""	register
+DW_OP_reg1	0x51	""	register
+DW_OP_reg2	0x52	""	register
+DW_OP_reg3	0x53	""	register
+DW_OP_reg4	0x54	""	register
+DW_OP_reg5	0x55	""	register
+DW_OP_reg6	0x56	""	register
+DW_OP_reg7	0x57	""	register
+DW_OP_reg8	0x58	""	register
+DW_OP_reg9	0x59	""	register
+DW_OP_reg10	0x5a	""	register
+DW_OP_reg11	0x5b	""	register
+DW_OP_reg12	0x5c	""	register
+DW_OP_reg13	0x5d	""	register
+DW_OP_reg14	0x5e	""	register
+DW_OP_reg15	0x5f	""	register
+DW_OP_reg16	0x60	""	register
+DW_OP_reg17	0x61	""	register
+DW_OP_reg18	0x62	""	register
+DW_OP_reg19	0x63	""	register
+DW_OP_reg20	0x64	""	register
+DW_OP_reg21	0x65	""	register
+DW_OP_reg22	0x66	""	register
+DW_OP_reg23	0x67	""	register
+DW_OP_reg24	0x68	""	register
+DW_OP_reg25	0x69	""	register
+DW_OP_reg26	0x6a	""	register
+DW_OP_reg27	0x6b	""	register
+DW_OP_reg28	0x6c	""	register
+DW_OP_reg29	0x6d	""	register
+DW_OP_reg30	0x6e	""	register
+DW_OP_reg31	0x6f	""	register
+DW_OP_breg0	0x70	"s"
+DW_OP_breg1	0x71	"s"
+DW_OP_breg2	0x72	"s"
+DW_OP_breg3	0x73	"s"
+DW_OP_breg4	0x74	"s"
+DW_OP_breg5	0x75	"s"
+DW_OP_breg6	0x76	"s"
+DW_OP_breg7	0x77	"s"
+DW_OP_breg8	0x78	"s"
+DW_OP_breg9	0x79	"s"
+DW_OP_breg10	0x7a	"s"
+DW_OP_breg11	0x7b	"s"
+DW_OP_breg12	0x7c	"s"
+DW_OP_breg13	0x7d	"s"
+DW_OP_breg14	0x7e	"s"
+DW_OP_breg15	0x7f	"s"
+DW_OP_breg16	0x80	"s"
+DW_OP_breg17	0x81	"s"
+DW_OP_breg18	0x82	"s"
+DW_OP_breg19	0x83	"s"
+DW_OP_breg20	0x84	"s"
+DW_OP_breg21	0x85	"s"
+DW_OP_breg22	0x86	"s"
+DW_OP_breg23	0x87	"s"
+DW_OP_breg24	0x88	"s"
+DW_OP_breg25	0x89	"s"
+DW_OP_breg26	0x8a	"s"
+DW_OP_breg27	0x8b	"s"
+DW_OP_breg28	0x8c	"s"
+DW_OP_breg29	0x8d	"s"
+DW_OP_breg30	0x8e	"s"
+DW_OP_breg31	0x8f	"s"
+DW_OP_regx	0x90	"s"	register
+DW_OP_fbreg	0x91	"s"	framebase
+DW_OP_bregx	0x92	"us"
+DW_OP_piece	0x93	"u"	piece
+DW_OP_deref_size	0x94	"1"
+DW_OP_xderef_size	0x95	"1"
+DW_OP_nop	0x96	""
+DW_OP_push_object_address	0x97	""
+DW_OP_call2	0x98	"2"
+DW_OP_call4	0x99	"4"
+DW_OP_call_ref	0x9a	"4"
+DW_OP_form_tls_address	0x9b	""
+DW_OP_call_frame_cfa	0x9c	""	callframecfa
+DW_OP_bit_piece	0x9d	"uu"
+DW_OP_implicit_value	0x9e	"B"
+DW_OP_stack_value	0x9f	""

vendor/github.com/derekparker/delve/pkg/dwarf/op/regs.go

@@ -0,0 +1,102 @@
+package op
+
+import (
+	"bytes"
+	"encoding/binary"
+)
+
+type DwarfRegisters struct {
+	StaticBase uint64
+
+	CFA       int64
+	FrameBase int64
+	ObjBase   int64
+	Regs      []*DwarfRegister
+
+	ByteOrder binary.ByteOrder
+	PCRegNum  uint64
+	SPRegNum  uint64
+	BPRegNum  uint64
+}
+
+type DwarfRegister struct {
+	Uint64Val uint64
+	Bytes     []byte
+}
+
+// Uint64Val returns the uint64 value of register idx.
+func (regs *DwarfRegisters) Uint64Val(idx uint64) uint64 {
+	reg := regs.Reg(idx)
+	if reg == nil {
+		return 0
+	}
+	return regs.Regs[idx].Uint64Val
+}
+
+// Bytes returns the bytes value of register idx, nil if the register is not
+// defined.
+func (regs *DwarfRegisters) Bytes(idx uint64) []byte {
+	reg := regs.Reg(idx)
+	if reg == nil {
+		return nil
+	}
+	if reg.Bytes == nil {
+		var buf bytes.Buffer
+		binary.Write(&buf, regs.ByteOrder, reg.Uint64Val)
+		reg.Bytes = buf.Bytes()
+	}
+	return reg.Bytes
+}
+
+// Reg returns register idx or nil if the register is not defined.
+func (regs *DwarfRegisters) Reg(idx uint64) *DwarfRegister {
+	if idx >= uint64(len(regs.Regs)) {
+		return nil
+	}
+	return regs.Regs[idx]
+}
+
+func (regs *DwarfRegisters) PC() uint64 {
+	return regs.Uint64Val(regs.PCRegNum)
+}
+
+func (regs *DwarfRegisters) SP() uint64 {
+	return regs.Uint64Val(regs.SPRegNum)
+}
+
+func (regs *DwarfRegisters) BP() uint64 {
+	return regs.Uint64Val(regs.BPRegNum)
+}
+
+// AddReg adds register idx to regs.
+func (regs *DwarfRegisters) AddReg(idx uint64, reg *DwarfRegister) {
+	if idx >= uint64(len(regs.Regs)) {
+		newRegs := make([]*DwarfRegister, idx+1)
+		copy(newRegs, regs.Regs)
+		regs.Regs = newRegs
+	}
+	regs.Regs[idx] = reg
+}
+
+func DwarfRegisterFromUint64(v uint64) *DwarfRegister {
+	return &DwarfRegister{Uint64Val: v}
+}
+
+func DwarfRegisterFromBytes(bytes []byte) *DwarfRegister {
+	var v uint64
+	switch len(bytes) {
+	case 1:
+		v = uint64(bytes[0])
+	case 2:
+		x := binary.LittleEndian.Uint16(bytes)
+		v = uint64(x)
+	case 4:
+		x := binary.LittleEndian.Uint32(bytes)
+		v = uint64(x)
+	default:
+		if len(bytes) >= 8 {
+			v = binary.LittleEndian.Uint64(bytes[:8])
+		}
+	}
+	return &DwarfRegister{Uint64Val: v, Bytes: bytes}
+}

vendor/github.com/derekparker/delve/pkg/dwarf/reader/reader.go

@@ -1,11 +1,11 @@
 package reader
 
 import (
+	"debug/dwarf"
 	"errors"
 	"fmt"
 
-	"golang.org/x/debug/dwarf"
+	"github.com/derekparker/delve/pkg/dwarf/op"
-	"github.com/derekparker/delve/dwarf/op"
 )
 
 type Reader struct {
@@ -34,7 +34,7 @@ func (reader *Reader) SeekToEntry(entry *dwarf.Entry) error {
 
 // SeekToFunctionEntry moves the reader to the function that includes the
 // specified program counter.
-func (reader *Reader) SeekToFunction(pc uint64) (*dwarf.Entry, error) {
+func (reader *Reader) SeekToFunction(pc RelAddr) (*dwarf.Entry, error) {
 	reader.Seek(0)
 	for entry, err := reader.Next(); entry != nil; entry, err = reader.Next() {
 		if err != nil {
@@ -55,7 +55,7 @@ func (reader *Reader) SeekToFunction(pc uint64) (*dwarf.Entry, error) {
 			continue
 		}
 
-		if lowpc <= pc && highpc > pc {
+		if lowpc <= uint64(pc) && highpc > uint64(pc) {
 			return entry, nil
 		}
 	}
@@ -64,7 +64,7 @@ func (reader *Reader) SeekToFunction(pc uint64) (*dwarf.Entry, error) {
 }
 
 // Returns the address for the named entry.
-func (reader *Reader) AddrFor(name string) (uint64, error) {
+func (reader *Reader) AddrFor(name string, staticBase uint64) (uint64, error) {
 	entry, err := reader.FindEntryNamed(name, false)
 	if err != nil {
 		return 0, err
@@ -73,7 +73,7 @@ func (reader *Reader) AddrFor(name string) (uint64, error) {
 	if !ok {
 		return 0, fmt.Errorf("type assertion failed")
 	}
-	addr, err := op.ExecuteStackProgram(0, instructions)
+	addr, _, err := op.ExecuteStackProgram(op.DwarfRegisters{StaticBase: staticBase}, instructions)
 	if err != nil {
 		return 0, err
 	}
@@ -99,7 +99,7 @@ func (reader *Reader) AddrForMember(member string, initialInstructions []byte) (
 		if !ok {
 			continue
 		}
-		addr, err := op.ExecuteStackProgram(0, append(initialInstructions, instructions...))
+		addr, _, err := op.ExecuteStackProgram(op.DwarfRegisters{}, append(initialInstructions, instructions...))
 		return uint64(addr), err
 	}
 }
@@ -257,31 +257,7 @@ func (reader *Reader) InstructionsForEntry(entry *dwarf.Entry) ([]byte, error) {
 	return append([]byte{}, instructions...), nil
 }
 
-// NextScopeVariable moves the reader to the next debug entry that describes a local variable and returns the entry.
+// NextMemberVariable moves the reader to the next debug entry that describes a member variable and returns the entry.
-func (reader *Reader) NextScopeVariable() (*dwarf.Entry, error) {
-	for entry, err := reader.Next(); entry != nil; entry, err = reader.Next() {
-		if err != nil {
-			return nil, err
-		}
-
-		// All scope variables will be at the same depth
-		reader.SkipChildren()
-
-		// End of the current depth
-		if entry.Tag == 0 {
-			break
-		}
-
-		if entry.Tag == dwarf.TagVariable || entry.Tag == dwarf.TagFormalParameter {
-			return entry, nil
-		}
-	}
-
-	// No more items
-	return nil, nil
-}
-
-// NextMememberVariable moves the reader to the next debug entry that describes a member variable and returns the entry.
 func (reader *Reader) NextMemberVariable() (*dwarf.Entry, error) {
 	for entry, err := reader.Next(); entry != nil; entry, err = reader.Next() {
 		if err != nil {
@@ -343,3 +319,128 @@ func (reader *Reader) NextCompileUnit() (*dwarf.Entry, error) {
 
 	return nil, nil
 }
+
+// Entry represents a debug_info entry.
+// When calling Val, if the entry does not have the specified attribute, the
+// entry specified by DW_AT_abstract_origin will be searched recursively.
+type Entry interface {
+	Val(dwarf.Attr) interface{}
+}
+
+type compositeEntry []*dwarf.Entry
+
+func (ce compositeEntry) Val(attr dwarf.Attr) interface{} {
+	for _, e := range ce {
+		if r := e.Val(attr); r != nil {
+			return r
+		}
+	}
+	return nil
+}
+
+// LoadAbstractOrigin loads the entry corresponding to the
+// DW_AT_abstract_origin of entry and returns a combination of entry and its
+// abstract origin.
+func LoadAbstractOrigin(entry *dwarf.Entry, aordr *dwarf.Reader) (Entry, dwarf.Offset) {
+	ao, ok := entry.Val(dwarf.AttrAbstractOrigin).(dwarf.Offset)
+	if !ok {
+		return entry, entry.Offset
+	}
+
+	r := []*dwarf.Entry{entry}
+
+	for {
+		aordr.Seek(ao)
+		e, _ := aordr.Next()
+		if e == nil {
+			break
+		}
+		r = append(r, e)
+
+		ao, ok = e.Val(dwarf.AttrAbstractOrigin).(dwarf.Offset)
+		if !ok {
+			break
+		}
+	}
+
+	return compositeEntry(r), entry.Offset
+}
+
+// InlineStackReader provides a way to read the stack of inlined calls at a
+// specified PC address.
+type InlineStackReader struct {
+	dwarf  *dwarf.Data
+	reader *dwarf.Reader
+	entry  *dwarf.Entry
+	depth  int
+	pc     uint64
+	err    error
+}
+
+// InlineStack returns an InlineStackReader for the specified function and
+// PC address.
+// If pc is 0 then all inlined calls will be returned.
+func InlineStack(dwarf *dwarf.Data, fnoff dwarf.Offset, pc RelAddr) *InlineStackReader {
+	reader := dwarf.Reader()
+	reader.Seek(fnoff)
+	return &InlineStackReader{dwarf: dwarf, reader: reader, entry: nil, depth: 0, pc: uint64(pc)}
+}
+
+// Next reads next inlined call in the stack, returns false if there aren't any.
+func (irdr *InlineStackReader) Next() bool {
+	if irdr.err != nil {
+		return false
+	}
+
+	for {
+		irdr.entry, irdr.err = irdr.reader.Next()
+		if irdr.entry == nil || irdr.err != nil {
+			return false
+		}
+
+		switch irdr.entry.Tag {
+		case 0:
+			irdr.depth--
+			if irdr.depth == 0 {
+				return false
+			}
+
+		case dwarf.TagLexDwarfBlock, dwarf.TagSubprogram, dwarf.TagInlinedSubroutine:
+			var recur bool
+			if irdr.pc != 0 {
+				recur, irdr.err = entryRangesContains(irdr.dwarf, irdr.entry, irdr.pc)
+			} else {
+				recur = true
+			}
+			if recur {
+				irdr.depth++
+				if irdr.entry.Tag == dwarf.TagInlinedSubroutine {
+					return true
+				}
+			} else {
+				if irdr.depth == 0 {
+					return false
+				}
+				irdr.reader.SkipChildren()
+			}
+
+		default:
+			irdr.reader.SkipChildren()
+		}
+	}
+}
+
+// Entry returns the DIE for the current inlined call.
+func (irdr *InlineStackReader) Entry() *dwarf.Entry {
+	return irdr.entry
+}
+
+// Err returns an error, if any was encountered.
+func (irdr *InlineStackReader) Err() error {
+	return irdr.err
+}
+
+// SkipChildren skips all children of the current inlined call.
+func (irdr *InlineStackReader) SkipChildren() {
+	irdr.reader.SkipChildren()
+}

vendor/github.com/derekparker/delve/pkg/dwarf/reader/variables.go

@@ -0,0 +1,114 @@
+package reader
+
+import (
+	"errors"
+
+	"debug/dwarf"
+)
+
+// RelAddr is an address relative to the static base. For normal executables
+// this is just a normal memory address, for PIE it's a relative address.
+type RelAddr uint64
+
+func ToRelAddr(addr uint64, staticBase uint64) RelAddr {
+	return RelAddr(addr - staticBase)
+}
+
+// VariableReader provides a way of reading the local variables and formal
+// parameters of a function that are visible at the specified PC address.
+type VariableReader struct {
+	dwarf       *dwarf.Data
+	reader      *dwarf.Reader
+	entry       *dwarf.Entry
+	depth       int
+	onlyVisible bool
+	pc          uint64
+	line        int
+	err         error
+}
+
+// Variables returns a VariableReader for the function or lexical block at off.
+// If onlyVisible is true only variables visible at pc will be returned by
+// the VariableReader.
+func Variables(dwarf *dwarf.Data, off dwarf.Offset, pc RelAddr, line int, onlyVisible bool) *VariableReader {
+	reader := dwarf.Reader()
+	reader.Seek(off)
+	return &VariableReader{dwarf: dwarf, reader: reader, entry: nil, depth: 0, onlyVisible: onlyVisible, pc: uint64(pc), line: line, err: nil}
+}
+
+// Next reads the next variable entry, returns false if there aren't any.
+func (vrdr *VariableReader) Next() bool {
+	if vrdr.err != nil {
+		return false
+	}
+
+	for {
+		vrdr.entry, vrdr.err = vrdr.reader.Next()
+		if vrdr.entry == nil || vrdr.err != nil {
+			return false
+		}
+
+		switch vrdr.entry.Tag {
+		case 0:
+			vrdr.depth--
+			if vrdr.depth == 0 {
+				return false
+			}
+
+		case dwarf.TagLexDwarfBlock, dwarf.TagSubprogram, dwarf.TagInlinedSubroutine:
+			recur := true
+			if vrdr.onlyVisible {
+				recur, vrdr.err = entryRangesContains(vrdr.dwarf, vrdr.entry, vrdr.pc)
+				if vrdr.err != nil {
+					return false
+				}
+			}
+
+			if recur && vrdr.entry.Children {
+				vrdr.depth++
+			} else {
+				if vrdr.depth == 0 {
+					return false
+				}
+				vrdr.reader.SkipChildren()
+			}
+
+		default:
+			if vrdr.depth == 0 {
+				vrdr.err = errors.New("offset was not lexical block or subprogram")
+				return false
+			}
+			if declLine, ok := vrdr.entry.Val(dwarf.AttrDeclLine).(int64); !ok || vrdr.line >= int(declLine) {
+				return true
+			}
+		}
+	}
+}
+
+func entryRangesContains(dwarf *dwarf.Data, entry *dwarf.Entry, pc uint64) (bool, error) {
+	rngs, err := dwarf.Ranges(entry)
+	if err != nil {
+		return false, err
+	}
+	for _, rng := range rngs {
+		if pc >= rng[0] && pc < rng[1] {
+			return true, nil
+		}
+	}
+	return false, nil
+}
+
+// Entry returns the current variable entry.
+func (vrdr *VariableReader) Entry() *dwarf.Entry {
+	return vrdr.entry
+}
+
+// Depth returns the depth of the current scope
+func (vrdr *VariableReader) Depth() int {
+	return vrdr.depth
+}
+
+// Err returns the error if there was one.
+func (vrdr *VariableReader) Err() error {
+	return vrdr.err
+}

vendor/github.com/derekparker/delve/pkg/dwarf/util/buf.go

@@ -4,23 +4,21 @@
 
 // Buffered reading and decoding of DWARF data streams.
 
-package dwarf
+package util
 
 import (
-	"encoding/binary"
+	"debug/dwarf"
 	"fmt"
-	"strconv"
 )
 
 // Data buffer being decoded.
 type buf struct {
-	dwarf  *Data
+	dwarf  *dwarf.Data
-	order  binary.ByteOrder
 	format dataFormat
 	name   string
-	off    Offset
+	off    dwarf.Offset
 	data   []byte
-	err    error
+	Err    error
 }
 
 // Data format, other than byte order.  This affects the handling of
@@ -37,22 +35,22 @@ type dataFormat interface {
 }
 
 // Some parts of DWARF have no data format, e.g., abbrevs.
-type unknownFormat struct{}
+type UnknownFormat struct{}
 
-func (u unknownFormat) version() int {
+func (u UnknownFormat) version() int {
 	return 0
 }
 
-func (u unknownFormat) dwarf64() (bool, bool) {
+func (u UnknownFormat) dwarf64() (bool, bool) {
 	return false, false
 }
 
-func (u unknownFormat) addrsize() int {
+func (u UnknownFormat) addrsize() int {
 	return 0
 }
 
-func makeBuf(d *Data, format dataFormat, name string, off Offset, data []byte) buf {
+func MakeBuf(d *dwarf.Data, format dataFormat, name string, off dwarf.Offset, data []byte) buf {
-	return buf{d, d.order, format, name, off, data, nil}
+	return buf{d, format, name, off, data, nil}
 }
 
 func (b *buf) slice(length int) buf {
@@ -63,7 +61,7 @@ func (b *buf) slice(length int) buf {
 	return n
 }
 
-func (b *buf) uint8() uint8 {
+func (b *buf) Uint8() uint8 {
 	if len(b.data) < 1 {
 		b.error("underflow")
 		return 0
@@ -81,7 +79,7 @@ func (b *buf) bytes(n int) []byte {
 	}
 	data := b.data[0:n]
 	b.data = b.data[n:]
-	b.off += Offset(n)
+	b.off += dwarf.Offset(n)
 	return data
 }
 
@@ -94,7 +92,7 @@ func (b *buf) string() string {
 		if b.data[i] == 0 {
 			s := string(b.data[0:i])
 			b.data = b.data[i+1:]
-			b.off += Offset(i + 1)
+			b.off += dwarf.Offset(i + 1)
 			return s
 		}
 	}
@@ -102,39 +100,15 @@ func (b *buf) string() string {
 	return ""
 }
 
-func (b *buf) uint16() uint16 {
-	a := b.bytes(2)
-	if a == nil {
-		return 0
-	}
-	return b.order.Uint16(a)
-}
-
-func (b *buf) uint32() uint32 {
-	a := b.bytes(4)
-	if a == nil {
-		return 0
-	}
-	return b.order.Uint32(a)
-}
-
-func (b *buf) uint64() uint64 {
-	a := b.bytes(8)
-	if a == nil {
-		return 0
-	}
-	return b.order.Uint64(a)
-}
-
 // Read a varint, which is 7 bits per byte, little endian.
 // the 0x80 bit means read another byte.
-func (b *buf) varint() (c uint64, bits uint) {
+func (b *buf) Varint() (c uint64, bits uint) {
 	for i := 0; i < len(b.data); i++ {
 		byte := b.data[i]
 		c |= uint64(byte&0x7F) << bits
 		bits += 7
 		if byte&0x80 == 0 {
-			b.off += Offset(i + 1)
+			b.off += dwarf.Offset(i + 1)
 			b.data = b.data[i+1:]
 			return c, bits
 		}
@@ -143,14 +117,14 @@ func (b *buf) varint() (c uint64, bits uint) {
 }
 
 // Unsigned int is just a varint.
-func (b *buf) uint() uint64 {
+func (b *buf) Uint() uint64 {
-	x, _ := b.varint()
+	x, _ := b.Varint()
 	return x
 }
 
 // Signed int is a sign-extended varint.
-func (b *buf) int() int64 {
+func (b *buf) Int() int64 {
-	ux, bits := b.varint()
+	ux, bits := b.Varint()
 	x := int64(ux)
 	if x&(1<<(bits-1)) != 0 {
 		x |= -1 << bits
@@ -158,24 +132,8 @@ func (b *buf) int() int64 {
 	return x
 }
 
-// Address-sized uint.
+// AssertEmpty checks that everything has been read from b.
-func (b *buf) addr() uint64 {
+func (b *buf) AssertEmpty() {
-	switch b.format.addrsize() {
-	case 1:
-		return uint64(b.uint8())
-	case 2:
-		return uint64(b.uint16())
-	case 4:
-		return uint64(b.uint32())
-	case 8:
-		return uint64(b.uint64())
-	}
-	b.error("unknown address size")
-	return 0
-}
-
-// assertEmpty checks that everything has been read from b.
-func (b *buf) assertEmpty() {
 	if len(b.data) == 0 {
 		return
 	}
@@ -186,18 +144,8 @@ func (b *buf) assertEmpty() {
 }
 
 func (b *buf) error(s string) {
-	if b.err == nil {
+	if b.Err == nil {
 		b.data = nil
-		b.err = DecodeError{b.name, b.off, s}
+		b.Err = dwarf.DecodeError{b.name, b.off, s}
 	}
 }
-
-type DecodeError struct {
-	Name   string
-	Offset Offset
-	Err    string
-}
-
-func (e DecodeError) Error() string {
-	return "decoding dwarf section " + e.Name + " at offset 0x" + strconv.FormatInt(int64(e.Offset), 16) + ": " + e.Err
-}

vendor/github.com/derekparker/delve/pkg/dwarf/util/util.go

@@ -1,6 +1,12 @@
 package util
 
-import "bytes"
+import (
+	"bytes"
+	"io"
+)
+
+// The Little Endian Base 128 format is defined in the DWARF v4 standard,
+// section 7.6, page 161 and following.
 
 // DecodeULEB128 decodes an unsigned Little Endian Base 128
 // represented number.
@@ -71,6 +77,45 @@ func DecodeSLEB128(buf *bytes.Buffer) (int64, uint32) {
 	return result, length
 }
 
+// EncodeULEB128 encodes x to the unsigned Little Endian Base 128 format
+// into out.
+func EncodeULEB128(out io.ByteWriter, x uint64) {
+	for {
+		b := byte(x & 0x7f)
+		x = x >> 7
+		if x != 0 {
+			b = b | 0x80
+		}
+		out.WriteByte(b)
+		if x == 0 {
+			break
+		}
+	}
+}
+
+// EncodeSLEB128 encodes x to the signed Little Endian Base 128 format
+// into out.
+func EncodeSLEB128(out io.ByteWriter, x int64) {
+	for {
+		b := byte(x & 0x7f)
+		x >>= 7
+
+		signb := b & 0x40
+
+		last := false
+		if (x == 0 && signb == 0) || (x == -1 && signb != 0) {
+			last = true
+		} else {
+			b = b | 0x80
+		}
+		out.WriteByte(b)
+
+		if last {
+			break
+		}
+	}
+}
+
 func ParseString(data *bytes.Buffer) (string, uint32) {
 	str, err := data.ReadString(0x0)
 	if err != nil {

vendor/github.com/derekparker/delve/pkg/goversion/go_version.go

@@ -0,0 +1,178 @@
+package goversion
+
+import (
+	"os/exec"
+	"strconv"
+	"strings"
+)
+
+// GoVersion represents the Go version of
+// the Go compiler version used to compile
+// the target binary.
+type GoVersion struct {
+	Major    int
+	Minor    int
+	Rev      int
+	Beta     int
+	RC       int
+	Proposal string
+}
+
+var (
+	GoVer18Beta = GoVersion{1, 8, -1, 0, 0, ""}
+)
+
+// Parse parses a go version string
+func Parse(ver string) (GoVersion, bool) {
+	var r GoVersion
+	var err1, err2, err3 error
+
+	if strings.HasPrefix(ver, "devel") {
+		return GoVersion{-1, 0, 0, 0, 0, ""}, true
+	}
+
+	if strings.HasPrefix(ver, "go") {
+		ver := strings.Split(ver, " ")[0]
+		v := strings.SplitN(ver[2:], ".", 4)
+		switch len(v) {
+		case 2:
+			r.Major, err1 = strconv.Atoi(v[0])
+			vr := strings.SplitN(v[1], "beta", 2)
+			if len(vr) == 2 {
+				r.Beta, err3 = strconv.Atoi(vr[1])
+			} else {
+				vr = strings.SplitN(v[1], "rc", 2)
+				if len(vr) == 2 {
+					r.RC, err3 = strconv.Atoi(vr[1])
+				} else {
+					r.Minor, err2 = strconv.Atoi(v[1])
+					if err2 != nil {
+						return GoVersion{}, false
+					}
+					return r, true
+				}
+			}
+
+			r.Minor, err2 = strconv.Atoi(vr[0])
+			r.Rev = -1
+			r.Proposal = ""
+
+			if err1 != nil || err2 != nil || err3 != nil {
+				return GoVersion{}, false
+			}
+
+			return r, true
+
+		case 3:
+
+			r.Major, err1 = strconv.Atoi(v[0])
+			r.Minor, err2 = strconv.Atoi(v[1])
+			r.Rev, err3 = strconv.Atoi(v[2])
+			r.Proposal = ""
+			if err1 != nil || err2 != nil || err3 != nil {
+				return GoVersion{}, false
+			}
+
+			return r, true
+
+		case 4:
+
+			r.Major, err1 = strconv.Atoi(v[0])
+			r.Minor, err2 = strconv.Atoi(v[1])
+			r.Rev, err3 = strconv.Atoi(v[2])
+			r.Proposal = v[3]
+			if err1 != nil || err2 != nil || err3 != nil || r.Proposal == "" {
+				return GoVersion{}, false
+			}
+
+			return r, true
+
+		default:
+			return GoVersion{}, false
+		}
+	}
+
+	return GoVersion{}, false
+}
+
+// AfterOrEqual returns whether one GoVersion is after or
+// equal to the other.
+func (v *GoVersion) AfterOrEqual(b GoVersion) bool {
+	if v.Major < b.Major {
+		return false
+	} else if v.Major > b.Major {
+		return true
+	}
+
+	if v.Minor < b.Minor {
+		return false
+	} else if v.Minor > b.Minor {
+		return true
+	}
+
+	if v.Rev < b.Rev {
+		return false
+	} else if v.Rev > b.Rev {
+		return true
+	}
+
+	if v.Beta < b.Beta {
+		return false
+	}
+
+	if v.RC < b.RC {
+		return false
+	}
+
+	return true
+}
+
+// IsDevel returns whether the GoVersion
+// is a development version.
+func (v *GoVersion) IsDevel() bool {
+	return v.Major < 0
+}
+
+const goVersionPrefix = "go version "
+
+// Installed runs "go version" and parses the output
+func Installed() (GoVersion, bool) {
+	out, err := exec.Command("go", "version").CombinedOutput()
+	if err != nil {
+		return GoVersion{}, false
+	}
+
+	s := string(out)
+
+	if !strings.HasPrefix(s, goVersionPrefix) {
+		return GoVersion{}, false
+	}
+
+	return Parse(s[len(goVersionPrefix):])
+}
+
+// VersionAfterOrEqual checks that version (as returned by runtime.Version()
+// or go version) is major.minor or a later version, or a development
+// version.
+func VersionAfterOrEqual(version string, major, minor int) bool {
+	ver, _ := Parse(version)
+	if ver.IsDevel() {
+		return true
+	}
+	return ver.AfterOrEqual(GoVersion{major, minor, -1, 0, 0, ""})
+}
+
+const producerVersionPrefix = "Go cmd/compile "
+
+// ProducerAfterOrEqual checks that the DW_AT_producer version is
+// major.minor or a later version, or a development version.
+func ProducerAfterOrEqual(producer string, major, minor int) bool {
+	if strings.HasPrefix(producer, producerVersionPrefix) {
+		producer = producer[len(producerVersionPrefix):]
+	}
+	ver, _ := Parse(producer)
+	if ver.IsDevel() {
+		return true
+	}
+	return ver.AfterOrEqual(GoVersion{major, minor, -1, 0, 0, ""})
+}

vendor/github.com/derekparker/delve/pkg/logflags/logflags.go

@@ -0,0 +1,83 @@
+package logflags
+
+import (
+	"errors"
+	"io/ioutil"
+	"log"
+	"strings"
+)
+
+var debugger = false
+var gdbWire = false
+var lldbServerOutput = false
+var debugLineErrors = false
+var rpc = false
+var fnCall = false
+
+// GdbWire returns true if the gdbserial package should log all the packets
+// exchanged with the stub.
+func GdbWire() bool {
+	return gdbWire
+}
+
+// Debugger returns true if the debugger package should log.
+func Debugger() bool {
+	return debugger
+}
+
+// LLDBServerOutput returns true if the output of the LLDB server should be
+// redirected to standard output instead of suppressed.
+func LLDBServerOutput() bool {
+	return lldbServerOutput
+}
+
+// DebugLineErrors returns true if pkg/dwarf/line should log its recoverable
+// errors.
+func DebugLineErrors() bool {
+	return debugLineErrors
+}
+
+// RPC returns true if rpc messages should be logged.
+func RPC() bool {
+	return rpc
+}
+
+// FnCall returns true if the function call protocol should be logged.
+func FnCall() bool {
+	return fnCall
+}
+
+var errLogstrWithoutLog = errors.New("--log-output specified without --log")
+
+// Setup sets debugger flags based on the contents of logstr.
+func Setup(logFlag bool, logstr string) error {
+	log.SetFlags(log.Ldate | log.Ltime | log.Lshortfile)
+	if !logFlag {
+		log.SetOutput(ioutil.Discard)
+		if logstr != "" {
+			return errLogstrWithoutLog
+		}
+		return nil
+	}
+	if logstr == "" {
+		logstr = "debugger"
+	}
+	v := strings.Split(logstr, ",")
+	for _, logcmd := range v {
+		switch logcmd {
+		case "debugger":
+			debugger = true
+		case "gdbwire":
+			gdbWire = true
+		case "lldbout":
+			lldbServerOutput = true
+		case "debuglineerr":
+			debugLineErrors = true
+		case "rpc":
+			rpc = true
+		case "fncall":
+			fnCall = true
+		}
+	}
+	return nil
+}

vendor/github.com/derekparker/delve/pkg/proc/arch.go

@@ -0,0 +1,306 @@
+package proc
+
+import (
+	"encoding/binary"
+
+	"github.com/derekparker/delve/pkg/dwarf/frame"
+	"github.com/derekparker/delve/pkg/dwarf/op"
+	"golang.org/x/arch/x86/x86asm"
+)
+
+// Arch defines an interface for representing a
+// CPU architecture.
+type Arch interface {
+	PtrSize() int
+	BreakpointInstruction() []byte
+	BreakpointSize() int
+	DerefTLS() bool
+	FixFrameUnwindContext(fctxt *frame.FrameContext, pc uint64, bi *BinaryInfo) *frame.FrameContext
+	RegSize(uint64) int
+	RegistersToDwarfRegisters(regs Registers, staticBase uint64) op.DwarfRegisters
+	GoroutineToDwarfRegisters(*G) op.DwarfRegisters
+}
+
+// AMD64 represents the AMD64 CPU architecture.
+type AMD64 struct {
+	ptrSize                 int
+	breakInstruction        []byte
+	breakInstructionLen     int
+	gStructOffset           uint64
+	hardwareBreakpointUsage []bool
+	goos                    string
+
+	// crosscall2fn is the DIE of crosscall2, a function used by the go runtime
+	// to call C functions. This function in go 1.9 (and previous versions) had
+	// a bad frame descriptor which needs to be fixed to generate good stack
+	// traces.
+	crosscall2fn *Function
+
+	// sigreturnfn is the DIE of runtime.sigreturn, the return trampoline for
+	// the signal handler. See comment in FixFrameUnwindContext for a
+	// description of why this is needed.
+	sigreturnfn *Function
+}
+
+const (
+	amd64DwarfIPRegNum uint64 = 16
+	amd64DwarfSPRegNum uint64 = 7
+	amd64DwarfBPRegNum uint64 = 6
+)
+
+// AMD64Arch returns an initialized AMD64
+// struct.
+func AMD64Arch(goos string) *AMD64 {
+	var breakInstr = []byte{0xCC}
+
+	return &AMD64{
+		ptrSize:                 8,
+		breakInstruction:        breakInstr,
+		breakInstructionLen:     len(breakInstr),
+		hardwareBreakpointUsage: make([]bool, 4),
+		goos:                    goos,
+	}
+}
+
+// PtrSize returns the size of a pointer
+// on this architecture.
+func (a *AMD64) PtrSize() int {
+	return a.ptrSize
+}
+
+// BreakpointInstruction returns the Breakpoint
+// instruction for this architecture.
+func (a *AMD64) BreakpointInstruction() []byte {
+	return a.breakInstruction
+}
+
+// BreakpointSize returns the size of the
+// breakpoint instruction on this architecture.
+func (a *AMD64) BreakpointSize() int {
+	return a.breakInstructionLen
+}
+
+// DerefTLS returns true if the value of regs.TLS()+GStructOffset() is a
+// pointer to the G struct
+func (a *AMD64) DerefTLS() bool {
+	return a.goos == "windows"
+}
+
+const (
+	crosscall2SPOffsetBad        = 0x8
+	crosscall2SPOffsetWindows    = 0x118
+	crosscall2SPOffsetNonWindows = 0x58
+)
+
+// FixFrameUnwindContext adds default architecture rules to fctxt or returns
+// the default frame unwind context if fctxt is nil.
+func (a *AMD64) FixFrameUnwindContext(fctxt *frame.FrameContext, pc uint64, bi *BinaryInfo) *frame.FrameContext {
+	if a.sigreturnfn == nil {
+		a.sigreturnfn = bi.LookupFunc["runtime.sigreturn"]
+	}
+
+	if fctxt == nil || (a.sigreturnfn != nil && pc >= a.sigreturnfn.Entry && pc < a.sigreturnfn.End) {
+		//if true {
+		// When there's no frame descriptor entry use BP (the frame pointer) instead
+		// - return register is [bp + a.PtrSize()] (i.e. [cfa-a.PtrSize()])
+		// - cfa is bp + a.PtrSize()*2
+		// - bp is [bp] (i.e. [cfa-a.PtrSize()*2])
+		// - sp is cfa
+
+		// When the signal handler runs it will move the execution to the signal
+		// handling stack (installed using the sigaltstack system call).
+		// This isn't a proper stack switch: the pointer to g in TLS will still
+		// refer to whatever g was executing on that thread before the signal was
+		// received.
+		// Since go did not execute a stack switch the previous value of sp, pc
+		// and bp is not saved inside g.sched, as it normally would.
+		// The only way to recover is to either read sp/pc from the signal context
+		// parameter (the ucontext_t* parameter) or to unconditionally follow the
+		// frame pointer when we get to runtime.sigreturn (which is what we do
+		// here).
+
+		return &frame.FrameContext{
+			RetAddrReg: amd64DwarfIPRegNum,
+			Regs: map[uint64]frame.DWRule{
+				amd64DwarfIPRegNum: frame.DWRule{
+					Rule:   frame.RuleOffset,
+					Offset: int64(-a.PtrSize()),
+				},
+				amd64DwarfBPRegNum: frame.DWRule{
+					Rule:   frame.RuleOffset,
+					Offset: int64(-2 * a.PtrSize()),
+				},
+				amd64DwarfSPRegNum: frame.DWRule{
+					Rule:   frame.RuleValOffset,
+					Offset: 0,
+				},
+			},
+			CFA: frame.DWRule{
+				Rule:   frame.RuleCFA,
+				Reg:    amd64DwarfBPRegNum,
+				Offset: int64(2 * a.PtrSize()),
+			},
+		}
+	}
+
+	if a.crosscall2fn == nil {
+		a.crosscall2fn = bi.LookupFunc["crosscall2"]
+	}
+
+	if a.crosscall2fn != nil && pc >= a.crosscall2fn.Entry && pc < a.crosscall2fn.End {
+		rule := fctxt.CFA
+		if rule.Offset == crosscall2SPOffsetBad {
+			switch a.goos {
+			case "windows":
+				rule.Offset += crosscall2SPOffsetWindows
+			default:
+				rule.Offset += crosscall2SPOffsetNonWindows
+			}
+		}
+		fctxt.CFA = rule
+	}
+
+	// We assume that RBP is the frame pointer and we want to keep it updated,
+	// so that we can use it to unwind the stack even when we encounter frames
+	// without descriptor entries.
+	// If there isn't a rule already we emit one.
+	if fctxt.Regs[amd64DwarfBPRegNum].Rule == frame.RuleUndefined {
+		fctxt.Regs[amd64DwarfBPRegNum] = frame.DWRule{
+			Rule:   frame.RuleFramePointer,
+			Reg:    amd64DwarfBPRegNum,
+			Offset: 0,
+		}
+	}
+
+	return fctxt
+}
+
+// RegSize returns the size (in bytes) of register regnum.
+// The mapping between hardware registers and DWARF registers is specified
+// in the System V ABI AMD64 Architecture Processor Supplement page 57,
+// figure 3.36
+// https://www.uclibc.org/docs/psABI-x86_64.pdf
+func (a *AMD64) RegSize(regnum uint64) int {
+	// XMM registers
+	if regnum > amd64DwarfIPRegNum && regnum <= 32 {
+		return 16
+	}
+	// x87 registers
+	if regnum >= 33 && regnum <= 40 {
+		return 10
+	}
+	return 8
+}
+
+// The mapping between hardware registers and DWARF registers is specified
+// in the System V ABI AMD64 Architecture Processor Supplement page 57,
+// figure 3.36
+// https://www.uclibc.org/docs/psABI-x86_64.pdf
+
+var asm64DwarfToHardware = map[int]x86asm.Reg{
+	0:  x86asm.RAX,
+	1:  x86asm.RDX,
+	2:  x86asm.RCX,
+	3:  x86asm.RBX,
+	4:  x86asm.RSI,
+	5:  x86asm.RDI,
+	8:  x86asm.R8,
+	9:  x86asm.R9,
+	10: x86asm.R10,
+	11: x86asm.R11,
+	12: x86asm.R12,
+	13: x86asm.R13,
+	14: x86asm.R14,
+	15: x86asm.R15,
+}
+
+var amd64DwarfToName = map[int]string{
+	17: "XMM0",
+	18: "XMM1",
+	19: "XMM2",
+	20: "XMM3",
+	21: "XMM4",
+	22: "XMM5",
+	23: "XMM6",
+	24: "XMM7",
+	25: "XMM8",
+	26: "XMM9",
+	27: "XMM10",
+	28: "XMM11",
+	29: "XMM12",
+	30: "XMM13",
+	31: "XMM14",
+	32: "XMM15",
+	33: "ST(0)",
+	34: "ST(1)",
+	35: "ST(2)",
+	36: "ST(3)",
+	37: "ST(4)",
+	38: "ST(5)",
+	39: "ST(6)",
+	40: "ST(7)",
+	49: "Eflags",
+	50: "Es",
+	51: "Cs",
+	52: "Ss",
+	53: "Ds",
+	54: "Fs",
+	55: "Gs",
+	58: "Fs_base",
+	59: "Gs_base",
+	64: "MXCSR",
+	65: "CW",
+	66: "SW",
+}
+
+func maxAmd64DwarfRegister() int {
+	max := int(amd64DwarfIPRegNum)
+	for i := range asm64DwarfToHardware {
+		if i > max {
+			max = i
+		}
+	}
+	for i := range amd64DwarfToName {
+		if i > max {
+			max = i
+		}
+	}
+	return max
+}
+
+// RegistersToDwarfRegisters converts hardware registers to the format used
+// by the DWARF expression interpreter.
+func (a *AMD64) RegistersToDwarfRegisters(regs Registers, staticBase uint64) op.DwarfRegisters {
+	dregs := make([]*op.DwarfRegister, maxAmd64DwarfRegister()+1)
+
+	dregs[amd64DwarfIPRegNum] = op.DwarfRegisterFromUint64(regs.PC())
+	dregs[amd64DwarfSPRegNum] = op.DwarfRegisterFromUint64(regs.SP())
+	dregs[amd64DwarfBPRegNum] = op.DwarfRegisterFromUint64(regs.BP())
+
+	for dwarfReg, asmReg := range asm64DwarfToHardware {
+		v, err := regs.Get(int(asmReg))
+		if err == nil {
+			dregs[dwarfReg] = op.DwarfRegisterFromUint64(v)
+		}
+	}
+
+	for _, reg := range regs.Slice() {
+		for dwarfReg, regName := range amd64DwarfToName {
+			if regName == reg.Name {
+				dregs[dwarfReg] = op.DwarfRegisterFromBytes(reg.Bytes)
+			}
+		}
+	}
+
+	return op.DwarfRegisters{StaticBase: staticBase, Regs: dregs, ByteOrder: binary.LittleEndian, PCRegNum: amd64DwarfIPRegNum, SPRegNum: amd64DwarfSPRegNum, BPRegNum: amd64DwarfBPRegNum}
+}
+
+// GoroutineToDwarfRegisters extract the saved DWARF registers from a parked
+// goroutine in the format used by the DWARF expression interpreter.
+func (a *AMD64) GoroutineToDwarfRegisters(g *G) op.DwarfRegisters {
+	dregs := make([]*op.DwarfRegister, amd64DwarfIPRegNum+1)
+	dregs[amd64DwarfIPRegNum] = op.DwarfRegisterFromUint64(g.PC)
+	dregs[amd64DwarfSPRegNum] = op.DwarfRegisterFromUint64(g.SP)
+	dregs[amd64DwarfBPRegNum] = op.DwarfRegisterFromUint64(g.BP)
+	return op.DwarfRegisters{StaticBase: g.variable.bi.staticBase, Regs: dregs, ByteOrder: binary.LittleEndian, PCRegNum: amd64DwarfIPRegNum, SPRegNum: amd64DwarfSPRegNum, BPRegNum: amd64DwarfBPRegNum}
+}

vendor/github.com/derekparker/delve/pkg/proc/bininfo.go

@@ -0,0 +1,878 @@
+package proc
+
+import (
+	"bytes"
+	"debug/dwarf"
+	"debug/elf"
+	"debug/macho"
+	"debug/pe"
+	"encoding/binary"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"sort"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/derekparker/delve/pkg/dwarf/frame"
+	"github.com/derekparker/delve/pkg/dwarf/godwarf"
+	"github.com/derekparker/delve/pkg/dwarf/line"
+	"github.com/derekparker/delve/pkg/dwarf/op"
+	"github.com/derekparker/delve/pkg/dwarf/reader"
+	"github.com/derekparker/delve/pkg/goversion"
+)
+
+// BinaryInfo holds information on the binary being executed.
+type BinaryInfo struct {
+	lastModified time.Time // Time the executable of this process was last modified
+
+	GOOS           string
+	closer         io.Closer
+	sepDebugCloser io.Closer
+
+	staticBase uint64
+
+	// Maps package names to package paths, needed to lookup types inside DWARF info
+	packageMap map[string]string
+
+	Arch          Arch
+	dwarf         *dwarf.Data
+	frameEntries  frame.FrameDescriptionEntries
+	loclist       loclistReader
+	compileUnits  []*compileUnit
+	types         map[string]dwarf.Offset
+	packageVars   []packageVar // packageVars is a list of all global/package variables in debug_info, sorted by address
+	gStructOffset uint64
+
+	// Functions is a list of all DW_TAG_subprogram entries in debug_info, sorted by entry point
+	Functions []Function
+	// Sources is a list of all source files found in debug_line.
+	Sources []string
+	// LookupFunc maps function names to a description of the function.
+	LookupFunc map[string]*Function
+
+	typeCache map[dwarf.Offset]godwarf.Type
+
+	loadModuleDataOnce sync.Once
+	moduleData         []moduleData
+	nameOfRuntimeType  map[uintptr]nameOfRuntimeTypeEntry
+
+	// runtimeTypeToDIE maps between the offset of a runtime._type in
+	// runtime.moduledata.types and the offset of the DIE in debug_info. This
+	// map is filled by using the extended attribute godwarf.AttrGoRuntimeType
+	// which was added in go 1.11.
+	runtimeTypeToDIE map[uint64]runtimeTypeDIE
+
+	// consts[off] lists all the constants with the type defined at offset off.
+	consts constantsMap
+
+	loadErrMu sync.Mutex
+	loadErr   error
+
+	dwarfReader *dwarf.Reader
+}
+
+// ErrUnsupportedLinuxArch is returned when attempting to debug a binary compiled for an unsupported architecture.
+var ErrUnsupportedLinuxArch = errors.New("unsupported architecture - only linux/amd64 is supported")
+
+// ErrUnsupportedWindowsArch is returned when attempting to debug a binary compiled for an unsupported architecture.
+var ErrUnsupportedWindowsArch = errors.New("unsupported architecture of windows/386 - only windows/amd64 is supported")
+
+// ErrUnsupportedDarwinArch is returned when attempting to debug a binary compiled for an unsupported architecture.
+var ErrUnsupportedDarwinArch = errors.New("unsupported architecture - only darwin/amd64 is supported")
+
+var ErrCouldNotDetermineRelocation = errors.New("could not determine the base address of a PIE")
+
+const dwarfGoLanguage = 22 // DW_LANG_Go (from DWARF v5, section 7.12, page 231)
+
+type compileUnit struct {
+	Name   string // univocal name for non-go compile units
+	LowPC  uint64
+	Ranges [][2]uint64
+
+	entry              *dwarf.Entry        // debug_info entry describing this compile unit
+	isgo               bool                // true if this is the go compile unit
+	lineInfo           *line.DebugLineInfo // debug_line segment associated with this compile unit
+	concreteInlinedFns []inlinedFn         // list of concrete inlined functions within this compile unit
+	optimized          bool                // this compile unit is optimized
+	producer           string              // producer attribute
+
+	startOffset, endOffset dwarf.Offset // interval of offsets contained in this compile unit
+}
+
+type partialUnitConstant struct {
+	name  string
+	typ   dwarf.Offset
+	value int64
+}
+
+type partialUnit struct {
+	entry     *dwarf.Entry
+	types     map[string]dwarf.Offset
+	variables []packageVar
+	constants []partialUnitConstant
+	functions []Function
+}
+
+// inlinedFn represents a concrete inlined function, e.g.
+// an entry for the generated code of an inlined function.
+type inlinedFn struct {
+	Name          string    // Name of the function that was inlined
+	LowPC, HighPC uint64    // Address range of the generated inlined instructions
+	CallFile      string    // File of the call site of the inlined function
+	CallLine      int64     // Line of the call site of the inlined function
+	Parent        *Function // The function that contains this inlined function
+}
+
+// Function describes a function in the target program.
+type Function struct {
+	Name       string
+	Entry, End uint64 // same as DW_AT_lowpc and DW_AT_highpc
+	offset     dwarf.Offset
+	cu         *compileUnit
+}
+
+// PackageName returns the package part of the symbol name,
+// or the empty string if there is none.
+// Borrowed from $GOROOT/debug/gosym/symtab.go
+func (fn *Function) PackageName() string {
+	return packageName(fn.Name)
+}
+
+func packageName(name string) string {
+	pathend := strings.LastIndex(name, "/")
+	if pathend < 0 {
+		pathend = 0
+	}
+
+	if i := strings.Index(name[pathend:], "."); i != -1 {
+		return name[:pathend+i]
+	}
+	return ""
+}
+
+// ReceiverName returns the receiver type name of this symbol,
+// or the empty string if there is none.
+// Borrowed from $GOROOT/debug/gosym/symtab.go
+func (fn *Function) ReceiverName() string {
+	pathend := strings.LastIndex(fn.Name, "/")
+	if pathend < 0 {
+		pathend = 0
+	}
+	l := strings.Index(fn.Name[pathend:], ".")
+	r := strings.LastIndex(fn.Name[pathend:], ".")
+	if l == -1 || r == -1 || l == r {
+		return ""
+	}
+	return fn.Name[pathend+l+1 : pathend+r]
+}
+
+// BaseName returns the symbol name without the package or receiver name.
+// Borrowed from $GOROOT/debug/gosym/symtab.go
+func (fn *Function) BaseName() string {
+	if i := strings.LastIndex(fn.Name, "."); i != -1 {
+		return fn.Name[i+1:]
+	}
+	return fn.Name
+}
+
+// Optimized returns true if the function was optimized by the compiler.
+func (fn *Function) Optimized() bool {
+	return fn.cu.optimized
+}
+
+type constantsMap map[dwarf.Offset]*constantType
+
+type constantType struct {
+	initialized bool
+	values      []constantValue
+}
+
+type constantValue struct {
+	name      string
+	fullName  string
+	value     int64
+	singleBit bool
+}
+
+// packageVar represents a package-level variable (or a C global variable).
+// If a global variable does not have an address (for example it's stored in
+// a register, or non-contiguously) addr will be 0.
+type packageVar struct {
+	name   string
+	offset dwarf.Offset
+	addr   uint64
+}
+
+type loclistReader struct {
+	data  []byte
+	cur   int
+	ptrSz int
+}
+
+func (rdr *loclistReader) Seek(off int) {
+	rdr.cur = off
+}
+
+func (rdr *loclistReader) read(sz int) []byte {
+	r := rdr.data[rdr.cur : rdr.cur+sz]
+	rdr.cur += sz
+	return r
+}
+
+func (rdr *loclistReader) oneAddr() uint64 {
+	switch rdr.ptrSz {
+	case 4:
+		addr := binary.LittleEndian.Uint32(rdr.read(rdr.ptrSz))
+		if addr == ^uint32(0) {
+			return ^uint64(0)
+		}
+		return uint64(addr)
+	case 8:
+		addr := uint64(binary.LittleEndian.Uint64(rdr.read(rdr.ptrSz)))
+		return addr
+	default:
+		panic("bad address size")
+	}
+}
+
+func (rdr *loclistReader) Next(e *loclistEntry) bool {
+	e.lowpc = rdr.oneAddr()
+	e.highpc = rdr.oneAddr()
+
+	if e.lowpc == 0 && e.highpc == 0 {
+		return false
+	}
+
+	if e.BaseAddressSelection() {
+		e.instr = nil
+		return true
+	}
+
+	instrlen := binary.LittleEndian.Uint16(rdr.read(2))
+	e.instr = rdr.read(int(instrlen))
+	return true
+}
+
+type loclistEntry struct {
+	lowpc, highpc uint64
+	instr         []byte
+}
+
+type runtimeTypeDIE struct {
+	offset dwarf.Offset
+	kind   int64
+}
+
+func (e *loclistEntry) BaseAddressSelection() bool {
+	return e.lowpc == ^uint64(0)
+}
+
+type buildIDHeader struct {
+	Namesz uint32
+	Descsz uint32
+	Type   uint32
+}
+
+// NewBinaryInfo returns an initialized but unloaded BinaryInfo struct.
+func NewBinaryInfo(goos, goarch string) *BinaryInfo {
+	r := &BinaryInfo{GOOS: goos, nameOfRuntimeType: make(map[uintptr]nameOfRuntimeTypeEntry), typeCache: make(map[dwarf.Offset]godwarf.Type)}
+
+	// TODO: find better way to determine proc arch (perhaps use executable file info).
+	switch goarch {
+	case "amd64":
+		r.Arch = AMD64Arch(goos)
+	}
+
+	return r
+}
+
+// LoadBinaryInfo will load and store the information from the binary at 'path'.
+// It is expected this will be called in parallel with other initialization steps
+// so a sync.WaitGroup must be provided.
+func (bi *BinaryInfo) LoadBinaryInfo(path string, entryPoint uint64, wg *sync.WaitGroup) error {
+	fi, err := os.Stat(path)
+	if err == nil {
+		bi.lastModified = fi.ModTime()
+	}
+
+	switch bi.GOOS {
+	case "linux":
+		return bi.LoadBinaryInfoElf(path, entryPoint, wg)
+	case "windows":
+		return bi.LoadBinaryInfoPE(path, entryPoint, wg)
+	case "darwin":
+		return bi.LoadBinaryInfoMacho(path, entryPoint, wg)
+	}
+	return errors.New("unsupported operating system")
+	return nil
+}
+
+// GStructOffset returns the offset of the G
+// struct in thread local storage.
+func (bi *BinaryInfo) GStructOffset() uint64 {
+	return bi.gStructOffset
+}
+
+// LastModified returns the last modified time of the binary.
+func (bi *BinaryInfo) LastModified() time.Time {
+	return bi.lastModified
+}
+
+// DwarfReader returns a reader for the dwarf data
+func (bi *BinaryInfo) DwarfReader() *reader.Reader {
+	return reader.New(bi.dwarf)
+}
+
+// Types returns list of types present in the debugged program.
+func (bi *BinaryInfo) Types() ([]string, error) {
+	types := make([]string, 0, len(bi.types))
+	for k := range bi.types {
+		types = append(types, k)
+	}
+	return types, nil
+}
+
+// PCToLine converts an instruction address to a file/line/function.
+func (bi *BinaryInfo) PCToLine(pc uint64) (string, int, *Function) {
+	fn := bi.PCToFunc(pc)
+	if fn == nil {
+		return "", 0, nil
+	}
+	f, ln := fn.cu.lineInfo.PCToLine(fn.Entry, pc)
+	return f, ln, fn
+}
+
+// LineToPC converts a file:line into a memory address.
+func (bi *BinaryInfo) LineToPC(filename string, lineno int) (pc uint64, fn *Function, err error) {
+	for _, cu := range bi.compileUnits {
+		if cu.lineInfo.Lookup[filename] != nil {
+			pc = cu.lineInfo.LineToPC(filename, lineno)
+			if pc == 0 {
+				// Check to see if this file:line belongs to the call site
+				// of an inlined function.
+				for _, ifn := range cu.concreteInlinedFns {
+					if strings.Contains(ifn.CallFile, filename) && ifn.CallLine == int64(lineno) {
+						pc = ifn.LowPC
+						fn = ifn.Parent
+						return
+					}
+				}
+			}
+			fn = bi.PCToFunc(pc)
+			if fn != nil {
+				return
+			}
+		}
+	}
+	err = fmt.Errorf("could not find %s:%d", filename, lineno)
+	return
+}
+
+// AllPCsForFileLine returns all PC addresses for the given filename:lineno.
+func (bi *BinaryInfo) AllPCsForFileLine(filename string, lineno int) []uint64 {
+	r := make([]uint64, 0, 1)
+	for _, cu := range bi.compileUnits {
+		if cu.lineInfo.Lookup[filename] != nil {
+			r = append(r, cu.lineInfo.AllPCsForFileLine(filename, lineno)...)
+		}
+	}
+	return r
+}
+
+// PCToFunc returns the function containing the given PC address
+func (bi *BinaryInfo) PCToFunc(pc uint64) *Function {
+	i := sort.Search(len(bi.Functions), func(i int) bool {
+		fn := bi.Functions[i]
+		return pc <= fn.Entry || (fn.Entry <= pc && pc < fn.End)
+	})
+	if i != len(bi.Functions) {
+		fn := &bi.Functions[i]
+		if fn.Entry <= pc && pc < fn.End {
+			return fn
+		}
+	}
+	return nil
+}
+
+// Close closes all internal readers.
+func (bi *BinaryInfo) Close() error {
+	if bi.sepDebugCloser != nil {
+		bi.sepDebugCloser.Close()
+	}
+	return bi.closer.Close()
+}
+
+func (bi *BinaryInfo) setLoadError(fmtstr string, args ...interface{}) {
+	bi.loadErrMu.Lock()
+	bi.loadErr = fmt.Errorf(fmtstr, args...)
+	bi.loadErrMu.Unlock()
+}
+
+// LoadError returns any internal load error.
+func (bi *BinaryInfo) LoadError() error {
+	return bi.loadErr
+}
+
+type nilCloser struct{}
+
+func (c *nilCloser) Close() error { return nil }
+
+// LoadFromData creates a new BinaryInfo object using the specified data.
+// This is used for debugging BinaryInfo, you should use LoadBinary instead.
+func (bi *BinaryInfo) LoadFromData(dwdata *dwarf.Data, debugFrameBytes, debugLineBytes, debugLocBytes []byte) {
+	bi.closer = (*nilCloser)(nil)
+	bi.sepDebugCloser = (*nilCloser)(nil)
+	bi.dwarf = dwdata
+
+	if debugFrameBytes != nil {
+		bi.frameEntries = frame.Parse(debugFrameBytes, frame.DwarfEndian(debugFrameBytes), bi.staticBase)
+	}
+
+	bi.loclistInit(debugLocBytes)
+
+	bi.loadDebugInfoMaps(debugLineBytes, nil, nil)
+}
+
+func (bi *BinaryInfo) loclistInit(data []byte) {
+	bi.loclist.data = data
+	bi.loclist.ptrSz = bi.Arch.PtrSize()
+}
+
+func (bi *BinaryInfo) locationExpr(entry reader.Entry, attr dwarf.Attr, pc uint64) ([]byte, string, error) {
+	a := entry.Val(attr)
+	if a == nil {
+		return nil, "", fmt.Errorf("no location attribute %s", attr)
+	}
+	if instr, ok := a.([]byte); ok {
+		var descr bytes.Buffer
+		fmt.Fprintf(&descr, "[block] ")
+		op.PrettyPrint(&descr, instr)
+		return instr, descr.String(), nil
+	}
+	off, ok := a.(int64)
+	if !ok {
+		return nil, "", fmt.Errorf("could not interpret location attribute %s", attr)
+	}
+	if bi.loclist.data == nil {
+		return nil, "", fmt.Errorf("could not find loclist entry at %#x for address %#x (no debug_loc section found)", off, pc)
+	}
+	instr := bi.loclistEntry(off, pc)
+	if instr == nil {
+		return nil, "", fmt.Errorf("could not find loclist entry at %#x for address %#x", off, pc)
+	}
+	var descr bytes.Buffer
+	fmt.Fprintf(&descr, "[%#x:%#x] ", off, pc)
+	op.PrettyPrint(&descr, instr)
+	return instr, descr.String(), nil
+}
+
+// Location returns the location described by attribute attr of entry.
+// This will either be an int64 address or a slice of Pieces for locations
+// that don't correspond to a single memory address (registers, composite
+// locations).
+func (bi *BinaryInfo) Location(entry reader.Entry, attr dwarf.Attr, pc uint64, regs op.DwarfRegisters) (int64, []op.Piece, string, error) {
+	instr, descr, err := bi.locationExpr(entry, attr, pc)
+	if err != nil {
+		return 0, nil, "", err
+	}
+	addr, pieces, err := op.ExecuteStackProgram(regs, instr)
+	return addr, pieces, descr, err
+}
+
+// loclistEntry returns the loclist entry in the loclist starting at off,
+// for address pc.
+func (bi *BinaryInfo) loclistEntry(off int64, pc uint64) []byte {
+	var base uint64
+	if cu := bi.findCompileUnit(pc); cu != nil {
+		base = cu.LowPC
+	}
+
+	bi.loclist.Seek(int(off))
+	var e loclistEntry
+	for bi.loclist.Next(&e) {
+		if e.BaseAddressSelection() {
+			base = e.highpc
+			continue
+		}
+		if pc >= e.lowpc+base && pc < e.highpc+base {
+			return e.instr
+		}
+	}
+
+	return nil
+}
+
+// findCompileUnit returns the compile unit containing address pc.
+func (bi *BinaryInfo) findCompileUnit(pc uint64) *compileUnit {
+	for _, cu := range bi.compileUnits {
+		for _, rng := range cu.Ranges {
+			if pc >= rng[0] && pc < rng[1] {
+				return cu
+			}
+		}
+	}
+	return nil
+}
+
+func (bi *BinaryInfo) findCompileUnitForOffset(off dwarf.Offset) *compileUnit {
+	for _, cu := range bi.compileUnits {
+		if off >= cu.startOffset && off < cu.endOffset {
+			return cu
+		}
+	}
+	return nil
+}
+
+// Producer returns the value of DW_AT_producer.
+func (bi *BinaryInfo) Producer() string {
+	for _, cu := range bi.compileUnits {
+		if cu.isgo && cu.producer != "" {
+			return cu.producer
+		}
+	}
+	return ""
+}
+
+// Type returns the Dwarf type entry at `offset`.
+func (bi *BinaryInfo) Type(offset dwarf.Offset) (godwarf.Type, error) {
+	return godwarf.ReadType(bi.dwarf, offset, bi.typeCache)
+}
+
+// ELF ///////////////////////////////////////////////////////////////
+
+// ErrNoBuildIDNote is used in openSeparateDebugInfo to signal there's no
+// build-id note on the binary, so LoadBinaryInfoElf will return
+// the error message coming from elfFile.DWARF() instead.
+type ErrNoBuildIDNote struct{}
+
+func (e *ErrNoBuildIDNote) Error() string {
+	return "can't find build-id note on binary"
+}
+
+// openSeparateDebugInfo searches for a file containing the separate
+// debug info for the binary using the "build ID" method as described
+// in GDB's documentation [1], and if found returns two handles, one
+// for the bare file, and another for its corresponding elf.File.
+// [1] https://sourceware.org/gdb/onlinedocs/gdb/Separate-Debug-Files.html
+func (bi *BinaryInfo) openSeparateDebugInfo(exe *elf.File) (*os.File, *elf.File, error) {
+	buildid := exe.Section(".note.gnu.build-id")
+	if buildid == nil {
+		return nil, nil, &ErrNoBuildIDNote{}
+	}
+
+	br := buildid.Open()
+	bh := new(buildIDHeader)
+	if err := binary.Read(br, binary.LittleEndian, bh); err != nil {
+		return nil, nil, errors.New("can't read build-id header: " + err.Error())
+	}
+
+	name := make([]byte, bh.Namesz)
+	if err := binary.Read(br, binary.LittleEndian, name); err != nil {
+		return nil, nil, errors.New("can't read build-id name: " + err.Error())
+	}
+
+	if strings.TrimSpace(string(name)) != "GNU\x00" {
+		return nil, nil, errors.New("invalid build-id signature")
+	}
+
+	descBinary := make([]byte, bh.Descsz)
+	if err := binary.Read(br, binary.LittleEndian, descBinary); err != nil {
+		return nil, nil, errors.New("can't read build-id desc: " + err.Error())
+	}
+	desc := hex.EncodeToString(descBinary)
+
+	debugPath := fmt.Sprintf("/usr/lib/debug/.build-id/%s/%s.debug", desc[:2], desc[2:])
+	sepFile, err := os.OpenFile(debugPath, 0, os.ModePerm)
+	if err != nil {
+		return nil, nil, errors.New("can't open separate debug file: " + err.Error())
+	}
+
+	elfFile, err := elf.NewFile(sepFile)
+	if err != nil {
+		sepFile.Close()
+		return nil, nil, fmt.Errorf("can't open separate debug file %q: %v", debugPath, err.Error())
+	}
+
+	if elfFile.Machine != elf.EM_X86_64 {
+		sepFile.Close()
+		return nil, nil, fmt.Errorf("can't open separate debug file %q: %v", debugPath, ErrUnsupportedLinuxArch.Error())
+	}
+
+	return sepFile, elfFile, nil
+}
+
+// LoadBinaryInfoElf specifically loads information from an ELF binary.
+func (bi *BinaryInfo) LoadBinaryInfoElf(path string, entryPoint uint64, wg *sync.WaitGroup) error {
+	exe, err := os.OpenFile(path, 0, os.ModePerm)
+	if err != nil {
+		return err
+	}
+	bi.closer = exe
+	elfFile, err := elf.NewFile(exe)
+	if err != nil {
+		return err
+	}
+	if elfFile.Machine != elf.EM_X86_64 {
+		return ErrUnsupportedLinuxArch
+	}
+
+	if entryPoint != 0 {
+		bi.staticBase = entryPoint - elfFile.Entry
+	} else {
+		if elfFile.Type == elf.ET_DYN {
+			return ErrCouldNotDetermineRelocation
+		}
+	}
+
+	dwarfFile := elfFile
+
+	bi.dwarf, err = elfFile.DWARF()
+	if err != nil {
+		var sepFile *os.File
+		var serr error
+		sepFile, dwarfFile, serr = bi.openSeparateDebugInfo(elfFile)
+		if serr != nil {
+			if _, ok := serr.(*ErrNoBuildIDNote); ok {
+				return err
+			}
+			return serr
+		}
+		bi.sepDebugCloser = sepFile
+		bi.dwarf, err = dwarfFile.DWARF()
+		if err != nil {
+			return err
+		}
+	}
+
+	bi.dwarfReader = bi.dwarf.Reader()
+
+	debugLineBytes, err := godwarf.GetDebugSectionElf(dwarfFile, "line")
+	if err != nil {
+		return err
+	}
+	debugLocBytes, _ := godwarf.GetDebugSectionElf(dwarfFile, "loc")
+	bi.loclistInit(debugLocBytes)
+
+	wg.Add(3)
+	go bi.parseDebugFrameElf(dwarfFile, wg)
+	go bi.loadDebugInfoMaps(debugLineBytes, wg, nil)
+	go bi.setGStructOffsetElf(dwarfFile, wg)
+	return nil
+}
+
+func (bi *BinaryInfo) parseDebugFrameElf(exe *elf.File, wg *sync.WaitGroup) {
+	defer wg.Done()
+
+	debugFrameData, err := godwarf.GetDebugSectionElf(exe, "frame")
+	if err != nil {
+		bi.setLoadError("could not get .debug_frame section: %v", err)
+		return
+	}
+	debugInfoData, err := godwarf.GetDebugSectionElf(exe, "info")
+	if err != nil {
+		bi.setLoadError("could not get .debug_info section: %v", err)
+		return
+	}
+
+	bi.frameEntries = frame.Parse(debugFrameData, frame.DwarfEndian(debugInfoData), bi.staticBase)
+}
+
+func (bi *BinaryInfo) setGStructOffsetElf(exe *elf.File, wg *sync.WaitGroup) {
+	defer wg.Done()
+
+	// This is a bit arcane. Essentially:
+	// - If the program is pure Go, it can do whatever it wants, and puts the G
+	//   pointer at %fs-8.
+	// - Otherwise, Go asks the external linker to place the G pointer by
+	//   emitting runtime.tlsg, a TLS symbol, which is relocated to the chosen
+	//   offset in libc's TLS block.
+	symbols, err := exe.Symbols()
+	if err != nil {
+		bi.setLoadError("could not parse ELF symbols: %v", err)
+		return
+	}
+	var tlsg *elf.Symbol
+	for _, symbol := range symbols {
+		if symbol.Name == "runtime.tlsg" {
+			s := symbol
+			tlsg = &s
+			break
+		}
+	}
+	if tlsg == nil {
+		bi.gStructOffset = ^uint64(8) + 1 // -8
+		return
+	}
+	var tls *elf.Prog
+	for _, prog := range exe.Progs {
+		if prog.Type == elf.PT_TLS {
+			tls = prog
+			break
+		}
+	}
+	// The TLS register points to the end of the TLS block, which is
+	// tls.Memsz long. runtime.tlsg is an offset from the beginning of that block.
+	bi.gStructOffset = ^(tls.Memsz) + 1 + tlsg.Value // -tls.Memsz + tlsg.Value
+}
+
+// PE ////////////////////////////////////////////////////////////////
+
+const _IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE = 0x0040
+
+// LoadBinaryInfoPE specifically loads information from a PE binary.
+func (bi *BinaryInfo) LoadBinaryInfoPE(path string, entryPoint uint64, wg *sync.WaitGroup) error {
+	peFile, closer, err := openExecutablePathPE(path)
+	if err != nil {
+		return err
+	}
+	bi.closer = closer
+	if peFile.Machine != pe.IMAGE_FILE_MACHINE_AMD64 {
+		return ErrUnsupportedWindowsArch
+	}
+	bi.dwarf, err = peFile.DWARF()
+	if err != nil {
+		return err
+	}
+
+	//TODO(aarzilli): actually test this when Go supports PIE buildmode on Windows.
+	opth := peFile.OptionalHeader.(*pe.OptionalHeader64)
+	if entryPoint != 0 {
+		bi.staticBase = entryPoint - opth.ImageBase
+	} else {
+		if opth.DllCharacteristics&_IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE != 0 {
+			return ErrCouldNotDetermineRelocation
+		}
+	}
+
+	bi.dwarfReader = bi.dwarf.Reader()
+
+	debugLineBytes, err := godwarf.GetDebugSectionPE(peFile, "line")
+	if err != nil {
+		return err
+	}
+	debugLocBytes, _ := godwarf.GetDebugSectionPE(peFile, "loc")
+	bi.loclistInit(debugLocBytes)
+
+	wg.Add(2)
+	go bi.parseDebugFramePE(peFile, wg)
+	go bi.loadDebugInfoMaps(debugLineBytes, wg, nil)
+
+	// Use ArbitraryUserPointer (0x28) as pointer to pointer
+	// to G struct per:
+	// https://golang.org/src/runtime/cgo/gcc_windows_amd64.c
+
+	bi.gStructOffset = 0x28
+	return nil
+}
+
+func openExecutablePathPE(path string) (*pe.File, io.Closer, error) {
+	f, err := os.OpenFile(path, 0, os.ModePerm)
+	if err != nil {
+		return nil, nil, err
+	}
+	peFile, err := pe.NewFile(f)
+	if err != nil {
+		f.Close()
+		return nil, nil, err
+	}
+	return peFile, f, nil
+}
+
+func (bi *BinaryInfo) parseDebugFramePE(exe *pe.File, wg *sync.WaitGroup) {
+	defer wg.Done()
+
+	debugFrameBytes, err := godwarf.GetDebugSectionPE(exe, "frame")
+	if err != nil {
+		bi.setLoadError("could not get .debug_frame section: %v", err)
+		return
+	}
+	debugInfoBytes, err := godwarf.GetDebugSectionPE(exe, "info")
+	if err != nil {
+		bi.setLoadError("could not get .debug_info section: %v", err)
+		return
+	}
+
+	bi.frameEntries = frame.Parse(debugFrameBytes, frame.DwarfEndian(debugInfoBytes), bi.staticBase)
+}
+
+// Borrowed from https://golang.org/src/cmd/internal/objfile/pe.go
+func findPESymbol(f *pe.File, name string) (*pe.Symbol, error) {
+	for _, s := range f.Symbols {
+		if s.Name != name {
+			continue
+		}
+		if s.SectionNumber <= 0 {
+			return nil, fmt.Errorf("symbol %s: invalid section number %d", name, s.SectionNumber)
+		}
+		if len(f.Sections) < int(s.SectionNumber) {
+			return nil, fmt.Errorf("symbol %s: section number %d is larger than max %d", name, s.SectionNumber, len(f.Sections))
+		}
+		return s, nil
+	}
+	return nil, fmt.Errorf("no %s symbol found", name)
+}
+
+// MACH-O ////////////////////////////////////////////////////////////
+
+// LoadBinaryInfoMacho specifically loads information from a Mach-O binary.
+func (bi *BinaryInfo) LoadBinaryInfoMacho(path string, entryPoint uint64, wg *sync.WaitGroup) error {
+	exe, err := macho.Open(path)
+	if err != nil {
+		return err
+	}
+	bi.closer = exe
+	if exe.Cpu != macho.CpuAmd64 {
+		return ErrUnsupportedDarwinArch
+	}
+	bi.dwarf, err = exe.DWARF()
+	if err != nil {
+		return err
+	}
+
+	bi.dwarfReader = bi.dwarf.Reader()
+
+	debugLineBytes, err := godwarf.GetDebugSectionMacho(exe, "line")
+	if err != nil {
+		return err
+	}
+	debugLocBytes, _ := godwarf.GetDebugSectionMacho(exe, "loc")
+	bi.loclistInit(debugLocBytes)
+
+	wg.Add(2)
+	go bi.parseDebugFrameMacho(exe, wg)
+	go bi.loadDebugInfoMaps(debugLineBytes, wg, bi.setGStructOffsetMacho)
+	return nil
+}
+
+func (bi *BinaryInfo) setGStructOffsetMacho() {
+	// In go1.11 it's 0x30, before 0x8a0, see:
+	// https://github.com/golang/go/issues/23617
+	// and go commit b3a854c733257c5249c3435ffcee194f8439676a
+	producer := bi.Producer()
+	if producer != "" && goversion.ProducerAfterOrEqual(producer, 1, 11) {
+		bi.gStructOffset = 0x30
+		return
+	}
+	bi.gStructOffset = 0x8a0
+}
+
+func (bi *BinaryInfo) parseDebugFrameMacho(exe *macho.File, wg *sync.WaitGroup) {
+	defer wg.Done()
+
+	debugFrameBytes, err := godwarf.GetDebugSectionMacho(exe, "frame")
+	if err != nil {
+		bi.setLoadError("could not get __debug_frame section: %v", err)
+		return
+	}
+	debugInfoBytes, err := godwarf.GetDebugSectionMacho(exe, "info")
+	if err != nil {
+		bi.setLoadError("could not get .debug_info section: %v", err)
+		return
+	}
+
+	bi.frameEntries = frame.Parse(debugFrameBytes, frame.DwarfEndian(debugInfoBytes), bi.staticBase)
+}

vendor/github.com/derekparker/delve/pkg/proc/breakpoints.go

@@ -0,0 +1,437 @@
+package proc
+
+import (
+	"errors"
+	"fmt"
+	"go/ast"
+	"go/constant"
+	"reflect"
+)
+
+// Breakpoint represents a breakpoint. Stores information on the break
+// point including the byte of data that originally was stored at that
+// address.
+type Breakpoint struct {
+	// File & line information for printing.
+	FunctionName string
+	File         string
+	Line         int
+
+	Addr         uint64 // Address breakpoint is set for.
+	OriginalData []byte // If software breakpoint, the data we replace with breakpoint instruction.
+	Name         string // User defined name of the breakpoint
+	ID           int    // Monotonically increasing ID.
+
+	// Kind describes whether this is an internal breakpoint (for next'ing or
+	// stepping).
+	// A single breakpoint can be both a UserBreakpoint and some kind of
+	// internal breakpoint, but it can not be two different kinds of internal
+	// breakpoint.
+	Kind BreakpointKind
+
+	// Breakpoint information
+	Tracepoint    bool     // Tracepoint flag
+	Goroutine     bool     // Retrieve goroutine information
+	Stacktrace    int      // Number of stack frames to retrieve
+	Variables     []string // Variables to evaluate
+	LoadArgs      *LoadConfig
+	LoadLocals    *LoadConfig
+	HitCount      map[int]uint64 // Number of times a breakpoint has been reached in a certain goroutine
+	TotalHitCount uint64         // Number of times a breakpoint has been reached
+
+	// DeferReturns: when kind == NextDeferBreakpoint this breakpoint
+	// will also check if the caller is runtime.gopanic or if the return
+	// address is in the DeferReturns array.
+	// Next uses NextDeferBreakpoints for the breakpoint it sets on the
+	// deferred function, DeferReturns is populated with the
+	// addresses of calls to runtime.deferreturn in the current
+	// function. This insures that the breakpoint on the deferred
+	// function only triggers on panic or on the defer call to
+	// the function, not when the function is called directly
+	DeferReturns []uint64
+	// Cond: if not nil the breakpoint will be triggered only if evaluating Cond returns true
+	Cond ast.Expr
+	// internalCond is the same as Cond but used for the condition of internal breakpoints
+	internalCond ast.Expr
+
+	// ReturnInfo describes how to collect return variables when this
+	// breakpoint is hit as a return breakpoint.
+	returnInfo *returnBreakpointInfo
+}
+
+// BreakpointKind determines the behavior of delve when the
+// breakpoint is reached.
+type BreakpointKind uint16
+
+const (
+	// UserBreakpoint is a user set breakpoint
+	UserBreakpoint BreakpointKind = (1 << iota)
+	// NextBreakpoint is a breakpoint set by Next, Continue
+	// will stop on it and delete it
+	NextBreakpoint
+	// NextDeferBreakpoint is a breakpoint set by Next on the
+	// first deferred function. In addition to checking their condition
+	// breakpoints of this kind will also check that the function has been
+	// called by runtime.gopanic or through runtime.deferreturn.
+	NextDeferBreakpoint
+	// StepBreakpoint is a breakpoint set by Step on a CALL instruction,
+	// Continue will set a new breakpoint (of NextBreakpoint kind) on the
+	// destination of CALL, delete this breakpoint and then continue again
+	StepBreakpoint
+)
+
+func (bp *Breakpoint) String() string {
+	return fmt.Sprintf("Breakpoint %d at %#v %s:%d (%d)", bp.ID, bp.Addr, bp.File, bp.Line, bp.TotalHitCount)
+}
+
+// BreakpointExistsError is returned when trying to set a breakpoint at
+// an address that already has a breakpoint set for it.
+type BreakpointExistsError struct {
+	File string
+	Line int
+	Addr uint64
+}
+
+func (bpe BreakpointExistsError) Error() string {
+	return fmt.Sprintf("Breakpoint exists at %s:%d at %x", bpe.File, bpe.Line, bpe.Addr)
+}
+
+// InvalidAddressError represents the result of
+// attempting to set a breakpoint at an invalid address.
+type InvalidAddressError struct {
+	Address uint64
+}
+
+func (iae InvalidAddressError) Error() string {
+	return fmt.Sprintf("Invalid address %#v\n", iae.Address)
+}
+
+type returnBreakpointInfo struct {
+	retFrameCond ast.Expr
+	fn           *Function
+	frameOffset  int64
+	spOffset     int64
+}
+
+// CheckCondition evaluates bp's condition on thread.
+func (bp *Breakpoint) CheckCondition(thread Thread) BreakpointState {
+	bpstate := BreakpointState{Breakpoint: bp, Active: false, Internal: false, CondError: nil}
+	if bp.Cond == nil && bp.internalCond == nil {
+		bpstate.Active = true
+		bpstate.Internal = bp.IsInternal()
+		return bpstate
+	}
+	nextDeferOk := true
+	if bp.Kind&NextDeferBreakpoint != 0 {
+		frames, err := ThreadStacktrace(thread, 2)
+		if err == nil {
+			ispanic := len(frames) >= 3 && frames[2].Current.Fn != nil && frames[2].Current.Fn.Name == "runtime.gopanic"
+			isdeferreturn := false
+			if len(frames) >= 1 {
+				for _, pc := range bp.DeferReturns {
+					if frames[0].Ret == pc {
+						isdeferreturn = true
+						break
+					}
+				}
+			}
+			nextDeferOk = ispanic || isdeferreturn
+		}
+	}
+	if bp.IsInternal() {
+		// Check internalCondition if this is also an internal breakpoint
+		bpstate.Active, bpstate.CondError = evalBreakpointCondition(thread, bp.internalCond)
+		bpstate.Active = bpstate.Active && nextDeferOk
+		if bpstate.Active || bpstate.CondError != nil {
+			bpstate.Internal = true
+			return bpstate
+		}
+	}
+	if bp.IsUser() {
+		// Check normal condition if this is also a user breakpoint
+		bpstate.Active, bpstate.CondError = evalBreakpointCondition(thread, bp.Cond)
+	}
+	return bpstate
+}
+
+// IsInternal returns true if bp is an internal breakpoint.
+// User-set breakpoints can overlap with internal breakpoints, in that case
+// both IsUser and IsInternal will be true.
+func (bp *Breakpoint) IsInternal() bool {
+	return bp.Kind != UserBreakpoint
+}
+
+// IsUser returns true if bp is a user-set breakpoint.
+// User-set breakpoints can overlap with internal breakpoints, in that case
+// both IsUser and IsInternal will be true.
+func (bp *Breakpoint) IsUser() bool {
+	return bp.Kind&UserBreakpoint != 0
+}
+
+func evalBreakpointCondition(thread Thread, cond ast.Expr) (bool, error) {
+	if cond == nil {
+		return true, nil
+	}
+	scope, err := GoroutineScope(thread)
+	if err != nil {
+		return true, err
+	}
+	v, err := scope.evalAST(cond)
+	if err != nil {
+		return true, fmt.Errorf("error evaluating expression: %v", err)
+	}
+	if v.Kind != reflect.Bool {
+		return true, errors.New("condition expression not boolean")
+	}
+	v.loadValue(loadFullValue)
+	if v.Unreadable != nil {
+		return true, fmt.Errorf("condition expression unreadable: %v", v.Unreadable)
+	}
+	return constant.BoolVal(v.Value), nil
+}
+
+// NoBreakpointError is returned when trying to
+// clear a breakpoint that does not exist.
+type NoBreakpointError struct {
+	Addr uint64
+}
+
+func (nbp NoBreakpointError) Error() string {
+	return fmt.Sprintf("no breakpoint at %#v", nbp.Addr)
+}
+
+// BreakpointMap represents an (address, breakpoint) map.
+type BreakpointMap struct {
+	M map[uint64]*Breakpoint
+
+	breakpointIDCounter         int
+	internalBreakpointIDCounter int
+}
+
+// NewBreakpointMap creates a new BreakpointMap.
+func NewBreakpointMap() BreakpointMap {
+	return BreakpointMap{
+		M: make(map[uint64]*Breakpoint),
+	}
+}
+
+// ResetBreakpointIDCounter resets the breakpoint ID counter of bpmap.
+func (bpmap *BreakpointMap) ResetBreakpointIDCounter() {
+	bpmap.breakpointIDCounter = 0
+}
+
+type writeBreakpointFn func(addr uint64) (file string, line int, fn *Function, originalData []byte, err error)
+type clearBreakpointFn func(*Breakpoint) error
+
+// Set creates a breakpoint at addr calling writeBreakpoint. Do not call this
+// function, call proc.Process.SetBreakpoint instead, this function exists
+// to implement proc.Process.SetBreakpoint.
+func (bpmap *BreakpointMap) Set(addr uint64, kind BreakpointKind, cond ast.Expr, writeBreakpoint writeBreakpointFn) (*Breakpoint, error) {
+	if bp, ok := bpmap.M[addr]; ok {
+		// We can overlap one internal breakpoint with one user breakpoint, we
+		// need to support this otherwise a conditional breakpoint can mask a
+		// breakpoint set by next or step.
+		if (kind != UserBreakpoint && bp.Kind != UserBreakpoint) || (kind == UserBreakpoint && bp.IsUser()) {
+			return bp, BreakpointExistsError{bp.File, bp.Line, bp.Addr}
+		}
+		bp.Kind |= kind
+		if kind != UserBreakpoint {
+			bp.internalCond = cond
+		} else {
+			bp.Cond = cond
+		}
+		return bp, nil
+	}
+
+	f, l, fn, originalData, err := writeBreakpoint(addr)
+	if err != nil {
+		return nil, err
+	}
+
+	newBreakpoint := &Breakpoint{
+		FunctionName: fn.Name,
+		File:         f,
+		Line:         l,
+		Addr:         addr,
+		Kind:         kind,
+		OriginalData: originalData,
+		HitCount:     map[int]uint64{},
+	}
+
+	if kind != UserBreakpoint {
+		bpmap.internalBreakpointIDCounter++
+		newBreakpoint.ID = bpmap.internalBreakpointIDCounter
+		newBreakpoint.internalCond = cond
+	} else {
+		bpmap.breakpointIDCounter++
+		newBreakpoint.ID = bpmap.breakpointIDCounter
+		newBreakpoint.Cond = cond
+	}
+
+	bpmap.M[addr] = newBreakpoint
+
+	return newBreakpoint, nil
+}
+
+// SetWithID creates a breakpoint at addr, with the specified ID.
+func (bpmap *BreakpointMap) SetWithID(id int, addr uint64, writeBreakpoint writeBreakpointFn) (*Breakpoint, error) {
+	bp, err := bpmap.Set(addr, UserBreakpoint, nil, writeBreakpoint)
+	if err == nil {
+		bp.ID = id
+		bpmap.breakpointIDCounter--
+	}
+	return bp, err
+}
+
+// Clear clears the breakpoint at addr.
+// Do not call this function call proc.Process.ClearBreakpoint instead.
+func (bpmap *BreakpointMap) Clear(addr uint64, clearBreakpoint clearBreakpointFn) (*Breakpoint, error) {
+	bp, ok := bpmap.M[addr]
+	if !ok {
+		return nil, NoBreakpointError{Addr: addr}
+	}
+
+	bp.Kind &= ^UserBreakpoint
+	bp.Cond = nil
+	if bp.Kind != 0 {
+		return bp, nil
+	}
+
+	if err := clearBreakpoint(bp); err != nil {
+		return nil, err
+	}
+
+	delete(bpmap.M, addr)
+
+	return bp, nil
+}
+
+// ClearInternalBreakpoints removes all internal breakpoints from the map,
+// calling clearBreakpoint on each one.
+// Do not call this function, call proc.Process.ClearInternalBreakpoints
+// instead, this function is used to implement that.
+func (bpmap *BreakpointMap) ClearInternalBreakpoints(clearBreakpoint clearBreakpointFn) error {
+	for addr, bp := range bpmap.M {
+		bp.Kind = bp.Kind & UserBreakpoint
+		bp.internalCond = nil
+		bp.returnInfo = nil
+		if bp.Kind != 0 {
+			continue
+		}
+		if err := clearBreakpoint(bp); err != nil {
+			return err
+		}
+		delete(bpmap.M, addr)
+	}
+	return nil
+}
+
+// HasInternalBreakpoints returns true if bpmap has at least one internal
+// breakpoint set.
+func (bpmap *BreakpointMap) HasInternalBreakpoints() bool {
+	for _, bp := range bpmap.M {
+		if bp.IsInternal() {
+			return true
+		}
+	}
+	return false
+}
+
+// BreakpointState describes the state of a breakpoint in a thread.
+type BreakpointState struct {
+	*Breakpoint
+	// Active is true if the breakpoint condition was met.
+	Active bool
+	// Internal is true if the breakpoint was matched as an internal
+	// breakpoint.
+	Internal bool
+	// CondError contains any error encountered while evaluating the
+	// breakpoint's condition.
+	CondError error
+}
+
+// Clear zeros the struct.
+func (bpstate *BreakpointState) Clear() {
+	bpstate.Breakpoint = nil
+	bpstate.Active = false
+	bpstate.Internal = false
+	bpstate.CondError = nil
+}
+
+func (bpstate *BreakpointState) String() string {
+	s := bpstate.Breakpoint.String()
+	if bpstate.Active {
+		s += " active"
+	}
+	if bpstate.Internal {
+		s += " internal"
+	}
+	return s
+}
+
+func configureReturnBreakpoint(bi *BinaryInfo, bp *Breakpoint, topframe *Stackframe, retFrameCond ast.Expr) {
+	if topframe.Current.Fn == nil {
+		return
+	}
+	bp.returnInfo = &returnBreakpointInfo{
+		retFrameCond: retFrameCond,
+		fn:           topframe.Current.Fn,
+		frameOffset:  topframe.FrameOffset(),
+		spOffset:     topframe.FrameOffset() - int64(bi.Arch.PtrSize()), // must be the value that SP had at the entry point of the function
+	}
+}
+
+func (rbpi *returnBreakpointInfo) Collect(thread Thread) []*Variable {
+	if rbpi == nil {
+		return nil
+	}
+
+	g, err := GetG(thread)
+	if err != nil {
+		return returnInfoError("could not get g", err, thread)
+	}
+	scope, err := GoroutineScope(thread)
+	if err != nil {
+		return returnInfoError("could not get scope", err, thread)
+	}
+	v, err := scope.evalAST(rbpi.retFrameCond)
+	if err != nil || v.Unreadable != nil || v.Kind != reflect.Bool {
+		// This condition was evaluated as part of the breakpoint condition
+		// evaluation, if the errors happen they will be reported as part of the
+		// condition errors.
+		return nil
+	}
+	if !constant.BoolVal(v.Value) {
+		// Breakpoint not hit as a return breakpoint.
+		return nil
+	}
+
+	oldFrameOffset := rbpi.frameOffset + int64(g.stackhi)
+	oldSP := uint64(rbpi.spOffset + int64(g.stackhi))
+	err = fakeFunctionEntryScope(scope, rbpi.fn, oldFrameOffset, oldSP)
+	if err != nil {
+		return returnInfoError("could not read function entry", err, thread)
+	}
+
+	vars, err := scope.Locals()
+	if err != nil {
+		return returnInfoError("could not evaluate return variables", err, thread)
+	}
+	vars = filterVariables(vars, func(v *Variable) bool {
+		return (v.Flags & VariableReturnArgument) != 0
+	})
+
+	// Go saves the return variables in the opposite order that the user
+	// specifies them so here we reverse the slice to make it easier to
+	// understand.
+	for i := 0; i < len(vars)/2; i++ {
+		vars[i], vars[len(vars)-i-1] = vars[len(vars)-i-1], vars[i]
+	}
+	return vars
+}
+
+func returnInfoError(descr string, err error, mem MemoryReadWriter) []*Variable {
+	v := newConstant(constant.MakeString(fmt.Sprintf("%s: %v", descr, err.Error())), mem)
+	v.Name = "return value read error"
+	return []*Variable{v}
+}

vendor/github.com/derekparker/delve/pkg/proc/core/core.go

@@ -0,0 +1,526 @@
+package core
+
+import (
+	"errors"
+	"fmt"
+	"go/ast"
+	"io"
+	"sync"
+
+	"github.com/derekparker/delve/pkg/proc"
+)
+
+// A SplicedMemory represents a memory space formed from multiple regions,
+// each of which may override previously regions. For example, in the following
+// core, the program text was loaded at 0x400000:
+// Start               End                 Page Offset
+// 0x0000000000400000  0x000000000044f000  0x0000000000000000
+// but then it's partially overwritten with an RW mapping whose data is stored
+// in the core file:
+// Type           Offset             VirtAddr           PhysAddr
+//                FileSiz            MemSiz              Flags  Align
+// LOAD           0x0000000000004000 0x000000000049a000 0x0000000000000000
+//                0x0000000000002000 0x0000000000002000  RW     1000
+// This can be represented in a SplicedMemory by adding the original region,
+// then putting the RW mapping on top of it.
+type SplicedMemory struct {
+	readers []readerEntry
+}
+
+type readerEntry struct {
+	offset uintptr
+	length uintptr
+	reader proc.MemoryReader
+}
+
+// Add adds a new region to the SplicedMemory, which may override existing regions.
+func (r *SplicedMemory) Add(reader proc.MemoryReader, off, length uintptr) {
+	if length == 0 {
+		return
+	}
+	end := off + length - 1
+	newReaders := make([]readerEntry, 0, len(r.readers))
+	add := func(e readerEntry) {
+		if e.length == 0 {
+			return
+		}
+		newReaders = append(newReaders, e)
+	}
+	inserted := false
+	// Walk through the list of regions, fixing up any that overlap and inserting the new one.
+	for _, entry := range r.readers {
+		entryEnd := entry.offset + entry.length - 1
+		switch {
+		case entryEnd < off:
+			// Entry is completely before the new region.
+			add(entry)
+		case end < entry.offset:
+			// Entry is completely after the new region.
+			if !inserted {
+				add(readerEntry{off, length, reader})
+				inserted = true
+			}
+			add(entry)
+		case off <= entry.offset && entryEnd <= end:
+			// Entry is completely overwritten by the new region. Drop.
+		case entry.offset < off && entryEnd <= end:
+			// New region overwrites the end of the entry.
+			entry.length = off - entry.offset
+			add(entry)
+		case off <= entry.offset && end < entryEnd:
+			// New reader overwrites the beginning of the entry.
+			if !inserted {
+				add(readerEntry{off, length, reader})
+				inserted = true
+			}
+			overlap := entry.offset - off
+			entry.offset += overlap
+			entry.length -= overlap
+			add(entry)
+		case entry.offset < off && end < entryEnd:
+			// New region punches a hole in the entry. Split it in two and put the new region in the middle.
+			add(readerEntry{entry.offset, off - entry.offset, entry.reader})
+			add(readerEntry{off, length, reader})
+			add(readerEntry{end + 1, entryEnd - end, entry.reader})
+			inserted = true
+		default:
+			panic(fmt.Sprintf("Unhandled case: existing entry is %v len %v, new is %v len %v", entry.offset, entry.length, off, length))
+		}
+	}
+	if !inserted {
+		newReaders = append(newReaders, readerEntry{off, length, reader})
+	}
+	r.readers = newReaders
+}
+
+// ReadMemory implements MemoryReader.ReadMemory.
+func (r *SplicedMemory) ReadMemory(buf []byte, addr uintptr) (n int, err error) {
+	started := false
+	for _, entry := range r.readers {
+		if entry.offset+entry.length < addr {
+			if !started {
+				continue
+			}
+			return n, fmt.Errorf("hit unmapped area at %v after %v bytes", addr, n)
+		}
+
+		// Don't go past the region.
+		pb := buf
+		if addr+uintptr(len(buf)) > entry.offset+entry.length {
+			pb = pb[:entry.offset+entry.length-addr]
+		}
+		pn, err := entry.reader.ReadMemory(pb, addr)
+		n += pn
+		if err != nil || pn != len(pb) {
+			return n, err
+		}
+		buf = buf[pn:]
+		addr += uintptr(pn)
+		if len(buf) == 0 {
+			// Done, don't bother scanning the rest.
+			return n, nil
+		}
+	}
+	if n == 0 {
+		return 0, fmt.Errorf("offset %v did not match any regions", addr)
+	}
+	return n, nil
+}
+
+// OffsetReaderAt wraps a ReaderAt into a MemoryReader, subtracting a fixed
+// offset from the address. This is useful to represent a mapping in an address
+// space. For example, if program text is mapped in at 0x400000, an
+// OffsetReaderAt with offset 0x400000 can be wrapped around file.Open(program)
+// to return the results of a read in that part of the address space.
+type OffsetReaderAt struct {
+	reader io.ReaderAt
+	offset uintptr
+}
+
+// ReadMemory will read the memory at addr-offset.
+func (r *OffsetReaderAt) ReadMemory(buf []byte, addr uintptr) (n int, err error) {
+	return r.reader.ReadAt(buf, int64(addr-r.offset))
+}
+
+// Process represents a core file.
+type Process struct {
+	bi                *proc.BinaryInfo
+	core              *Core
+	breakpoints       proc.BreakpointMap
+	currentThread     *Thread
+	selectedGoroutine *proc.G
+	common            proc.CommonProcess
+}
+
+// Thread represents a thread in the core file being debugged.
+type Thread struct {
+	th     *LinuxPrStatus
+	fpregs []proc.Register
+	p      *Process
+	common proc.CommonThread
+}
+
+var (
+	// ErrWriteCore is returned when attempting to write to the core
+	// process memory.
+	ErrWriteCore = errors.New("can not write to core process")
+
+	// ErrShortRead is returned on a short read.
+	ErrShortRead = errors.New("short read")
+
+	// ErrContinueCore is returned when trying to continue execution of a core process.
+	ErrContinueCore = errors.New("can not continue execution of core process")
+
+	// ErrChangeRegisterCore is returned when trying to change register values for core files.
+	ErrChangeRegisterCore = errors.New("can not change register values of core process")
+)
+
+// OpenCore will open the core file and return a Process struct.
+func OpenCore(corePath, exePath string) (*Process, error) {
+	core, err := readCore(corePath, exePath)
+	if err != nil {
+		return nil, err
+	}
+	p := &Process{
+		core:        core,
+		breakpoints: proc.NewBreakpointMap(),
+		bi:          proc.NewBinaryInfo("linux", "amd64"),
+	}
+	for _, thread := range core.Threads {
+		thread.p = p
+	}
+
+	var wg sync.WaitGroup
+	err = p.bi.LoadBinaryInfo(exePath, core.entryPoint, &wg)
+	wg.Wait()
+	if err == nil {
+		err = p.bi.LoadError()
+	}
+	if err != nil {
+		return nil, err
+	}
+
+	for _, th := range p.core.Threads {
+		p.currentThread = th
+		break
+	}
+	p.selectedGoroutine, _ = proc.GetG(p.CurrentThread())
+
+	return p, nil
+}
+
+// BinInfo will return the binary info.
+func (p *Process) BinInfo() *proc.BinaryInfo {
+	return p.bi
+}
+
+// Recorded returns whether this is a live or recorded process. Always returns true for core files.
+func (p *Process) Recorded() (bool, string) { return true, "" }
+
+// Restart will only return an error for core files, as they are not executing.
+func (p *Process) Restart(string) error { return ErrContinueCore }
+
+// Direction will only return an error as you cannot continue a core process.
+func (p *Process) Direction(proc.Direction) error { return ErrContinueCore }
+
+// When does not apply to core files, it is to support the Mozilla 'rr' backend.
+func (p *Process) When() (string, error) { return "", nil }
+
+// Checkpoint for core files returns an error, there is no execution of a core file.
+func (p *Process) Checkpoint(string) (int, error) { return -1, ErrContinueCore }
+
+// Checkpoints returns nil on core files, you cannot set checkpoints when debugging core files.
+func (p *Process) Checkpoints() ([]proc.Checkpoint, error) { return nil, nil }
+
+// ClearCheckpoint clears a checkpoint, but will only return an error for core files.
+func (p *Process) ClearCheckpoint(int) error { return errors.New("checkpoint not found") }
+
+// ReadMemory will return memory from the core file at the specified location and put the
+// read memory into `data`, returning the length read, and returning an error if
+// the length read is shorter than the length of the `data` buffer.
+func (t *Thread) ReadMemory(data []byte, addr uintptr) (n int, err error) {
+	n, err = t.p.core.ReadMemory(data, addr)
+	if err == nil && n != len(data) {
+		err = ErrShortRead
+	}
+	return n, err
+}
+
+// WriteMemory will only return an error for core files, you cannot write
+// to the memory of a core process.
+func (t *Thread) WriteMemory(addr uintptr, data []byte) (int, error) {
+	return 0, ErrWriteCore
+}
+
+// Location returns the location of this thread based on
+// the value of the instruction pointer register.
+func (t *Thread) Location() (*proc.Location, error) {
+	f, l, fn := t.p.bi.PCToLine(t.th.Reg.Rip)
+	return &proc.Location{PC: t.th.Reg.Rip, File: f, Line: l, Fn: fn}, nil
+}
+
+// Breakpoint returns the current breakpoint this thread is stopped at.
+// For core files this always returns an empty BreakpointState struct, as
+// there are no breakpoints when debugging core files.
+func (t *Thread) Breakpoint() proc.BreakpointState {
+	return proc.BreakpointState{}
+}
+
+// ThreadID returns the ID for this thread.
+func (t *Thread) ThreadID() int {
+	return int(t.th.Pid)
+}
+
+// Registers returns the current value of the registers for this thread.
+func (t *Thread) Registers(floatingPoint bool) (proc.Registers, error) {
+	r := &Registers{&t.th.Reg, nil}
+	if floatingPoint {
+		r.fpregs = t.fpregs
+	}
+	return r, nil
+}
+
+// RestoreRegisters will only return an error for core files,
+// you cannot change register values for core files.
+func (t *Thread) RestoreRegisters(proc.Registers) error {
+	return ErrChangeRegisterCore
+}
+
+// Arch returns the architecture the target is built for and executing on.
+func (t *Thread) Arch() proc.Arch {
+	return t.p.bi.Arch
+}
+
+// BinInfo returns information about the binary.
+func (t *Thread) BinInfo() *proc.BinaryInfo {
+	return t.p.bi
+}
+
+// StepInstruction will only return an error for core files,
+// you cannot execute a core file.
+func (t *Thread) StepInstruction() error {
+	return ErrContinueCore
+}
+
+// Blocked will return false always for core files as there is
+// no execution.
+func (t *Thread) Blocked() bool {
+	return false
+}
+
+// SetCurrentBreakpoint will always just return nil
+// for core files, as there are no breakpoints in core files.
+func (t *Thread) SetCurrentBreakpoint() error {
+	return nil
+}
+
+// Common returns a struct containing common information
+// across thread implementations.
+func (t *Thread) Common() *proc.CommonThread {
+	return &t.common
+}
+
+// SetPC will always return an error, you cannot
+// change register values when debugging core files.
+func (t *Thread) SetPC(uint64) error {
+	return ErrChangeRegisterCore
+}
+
+// SetSP will always return an error, you cannot
+// change register values when debugging core files.
+func (t *Thread) SetSP(uint64) error {
+	return ErrChangeRegisterCore
+}
+
+// SetDX will always return an error, you cannot
+// change register values when debugging core files.
+func (t *Thread) SetDX(uint64) error {
+	return ErrChangeRegisterCore
+}
+
+// Breakpoints will return all breakpoints for the process.
+func (p *Process) Breakpoints() *proc.BreakpointMap {
+	return &p.breakpoints
+}
+
+// ClearBreakpoint will always return an error as you cannot set or clear
+// breakpoints on core files.
+func (p *Process) ClearBreakpoint(addr uint64) (*proc.Breakpoint, error) {
+	return nil, proc.NoBreakpointError{Addr: addr}
+}
+
+// ClearInternalBreakpoints will always return nil and have no
+// effect since you cannot set breakpoints on core files.
+func (p *Process) ClearInternalBreakpoints() error {
+	return nil
+}
+
+// ContinueOnce will always return an error because you
+// cannot control execution of a core file.
+func (p *Process) ContinueOnce() (proc.Thread, error) {
+	return nil, ErrContinueCore
+}
+
+// StepInstruction will always return an error
+// as you cannot control execution of a core file.
+func (p *Process) StepInstruction() error {
+	return ErrContinueCore
+}
+
+// RequestManualStop will return nil and have no effect
+// as you cannot control execution of a core file.
+func (p *Process) RequestManualStop() error {
+	return nil
+}
+
+// CheckAndClearManualStopRequest will always return false and
+// have no effect since there are no manual stop requests as
+// there is no controlling execution of a core file.
+func (p *Process) CheckAndClearManualStopRequest() bool {
+	return false
+}
+
+// CurrentThread returns the current active thread.
+func (p *Process) CurrentThread() proc.Thread {
+	return p.currentThread
+}
+
+// Detach will always return nil and have no
+// effect as you cannot detach from a core file
+// and have it continue execution or exit.
+func (p *Process) Detach(bool) error {
+	return nil
+}
+
+// Valid returns whether the process is active. Always returns true
+// for core files as it cannot exit or be otherwise detached from.
+func (p *Process) Valid() (bool, error) {
+	return true, nil
+}
+
+// Common returns common information across Process
+// implementations.
+func (p *Process) Common() *proc.CommonProcess {
+	return &p.common
+}
+
+// Pid returns the process ID of this process.
+func (p *Process) Pid() int {
+	return p.core.Pid
+}
+
+// ResumeNotify is a no-op on core files as we cannot
+// control execution.
+func (p *Process) ResumeNotify(chan<- struct{}) {
+}
+
+// SelectedGoroutine returns the current active and selected
+// goroutine.
+func (p *Process) SelectedGoroutine() *proc.G {
+	return p.selectedGoroutine
+}
+
+// SetBreakpoint will always return an error for core files as you cannot write memory or control execution.
+func (p *Process) SetBreakpoint(addr uint64, kind proc.BreakpointKind, cond ast.Expr) (*proc.Breakpoint, error) {
+	return nil, ErrWriteCore
+}
+
+// SwitchGoroutine will change the selected and active goroutine.
+func (p *Process) SwitchGoroutine(gid int) error {
+	g, err := proc.FindGoroutine(p, gid)
+	if err != nil {
+		return err
+	}
+	if g == nil {
+		// user specified -1 and selectedGoroutine is nil
+		return nil
+	}
+	if g.Thread != nil {
+		return p.SwitchThread(g.Thread.ThreadID())
+	}
+	p.selectedGoroutine = g
+	return nil
+}
+
+// SwitchThread will change the selected and active thread.
+func (p *Process) SwitchThread(tid int) error {
+	if th, ok := p.core.Threads[tid]; ok {
+		p.currentThread = th
+		p.selectedGoroutine, _ = proc.GetG(p.CurrentThread())
+		return nil
+	}
+	return fmt.Errorf("thread %d does not exist", tid)
+}
+
+// ThreadList will return a list of all threads currently in the process.
+func (p *Process) ThreadList() []proc.Thread {
+	r := make([]proc.Thread, 0, len(p.core.Threads))
+	for _, v := range p.core.Threads {
+		r = append(r, v)
+	}
+	return r
+}
+
+// FindThread will return the thread with the corresponding thread ID.
+func (p *Process) FindThread(threadID int) (proc.Thread, bool) {
+	t, ok := p.core.Threads[threadID]
+	return t, ok
+}
+
+// Registers represents the CPU registers.
+type Registers struct {
+	*LinuxCoreRegisters
+	fpregs []proc.Register
+}
+
+// Slice will return a slice containing all registers and their values.
+func (r *Registers) Slice() []proc.Register {
+	var regs = []struct {
+		k string
+		v uint64
+	}{
+		{"Rip", r.Rip},
+		{"Rsp", r.Rsp},
+		{"Rax", r.Rax},
+		{"Rbx", r.Rbx},
+		{"Rcx", r.Rcx},
+		{"Rdx", r.Rdx},
+		{"Rdi", r.Rdi},
+		{"Rsi", r.Rsi},
+		{"Rbp", r.Rbp},
+		{"R8", r.R8},
+		{"R9", r.R9},
+		{"R10", r.R10},
+		{"R11", r.R11},
+		{"R12", r.R12},
+		{"R13", r.R13},
+		{"R14", r.R14},
+		{"R15", r.R15},
+		{"Orig_rax", r.Orig_rax},
+		{"Cs", r.Cs},
+		{"Eflags", r.Eflags},
+		{"Ss", r.Ss},
+		{"Fs_base", r.Fs_base},
+		{"Gs_base", r.Gs_base},
+		{"Ds", r.Ds},
+		{"Es", r.Es},
+		{"Fs", r.Fs},
+		{"Gs", r.Gs},
+	}
+	out := make([]proc.Register, 0, len(regs))
+	for _, reg := range regs {
+		if reg.k == "Eflags" {
+			out = proc.AppendEflagReg(out, reg.k, reg.v)
+		} else {
+			out = proc.AppendQwordReg(out, reg.k, reg.v)
+		}
+	}
+	out = append(out, r.fpregs...)
+	return out
+}
+
+// Copy will return a copy of the registers that is guarenteed
+// not to change.
+func (r *Registers) Copy() proc.Registers {
+	return r
+}

vendor/github.com/derekparker/delve/pkg/proc/core/linux_amd64_core.go

@@ -0,0 +1,556 @@
+package core
+
+import (
+	"bytes"
+	"debug/elf"
+	"encoding/binary"
+	"fmt"
+	"io"
+	"os"
+
+	"golang.org/x/arch/x86/x86asm"
+
+	"github.com/derekparker/delve/pkg/proc"
+	"github.com/derekparker/delve/pkg/proc/linutil"
+)
+
+// Copied from golang.org/x/sys/unix.PtraceRegs since it's not available on
+// all systems.
+type LinuxCoreRegisters struct {
+	R15      uint64
+	R14      uint64
+	R13      uint64
+	R12      uint64
+	Rbp      uint64
+	Rbx      uint64
+	R11      uint64
+	R10      uint64
+	R9       uint64
+	R8       uint64
+	Rax      uint64
+	Rcx      uint64
+	Rdx      uint64
+	Rsi      uint64
+	Rdi      uint64
+	Orig_rax uint64
+	Rip      uint64
+	Cs       uint64
+	Eflags   uint64
+	Rsp      uint64
+	Ss       uint64
+	Fs_base  uint64
+	Gs_base  uint64
+	Ds       uint64
+	Es       uint64
+	Fs       uint64
+	Gs       uint64
+}
+
+// Copied from golang.org/x/sys/unix.Timeval since it's not available on all
+// systems.
+type LinuxCoreTimeval struct {
+	Sec  int64
+	Usec int64
+}
+
+// NT_FILE is file mapping information, e.g. program text mappings. Desc is a LinuxNTFile.
+const NT_FILE elf.NType = 0x46494c45 // "FILE".
+
+// NT_X86_XSTATE is other registers, including AVX and such.
+const NT_X86_XSTATE elf.NType = 0x202 // Note type for notes containing X86 XSAVE area.
+
+// NT_AUXV is the note type for notes containing a copy of the Auxv array
+const NT_AUXV elf.NType = 0x6
+
+// PC returns the value of RIP.
+func (r *LinuxCoreRegisters) PC() uint64 {
+	return r.Rip
+}
+
+// SP returns the value of RSP.
+func (r *LinuxCoreRegisters) SP() uint64 {
+	return r.Rsp
+}
+
+// BP returns the value of RBP.
+func (r *LinuxCoreRegisters) BP() uint64 {
+	return r.Rbp
+}
+
+// CX returns the value of RCX.
+func (r *LinuxCoreRegisters) CX() uint64 {
+	return r.Rcx
+}
+
+// TLS returns the location of the thread local storate,
+// which will be the value of Fs_base.
+func (r *LinuxCoreRegisters) TLS() uint64 {
+	return r.Fs_base
+}
+
+// GAddr returns the address of the G struct. Always returns 0
+// and false for core files.
+func (r *LinuxCoreRegisters) GAddr() (uint64, bool) {
+	return 0, false
+}
+
+// Get returns the value of the register requested via the
+// register number, returning an error if that register
+// could not be found.
+func (r *LinuxCoreRegisters) Get(n int) (uint64, error) {
+	reg := x86asm.Reg(n)
+	const (
+		mask8  = 0x000f
+		mask16 = 0x00ff
+		mask32 = 0xffff
+	)
+
+	switch reg {
+	// 8-bit
+	case x86asm.AL:
+		return r.Rax & mask8, nil
+	case x86asm.CL:
+		return r.Rcx & mask8, nil
+	case x86asm.DL:
+		return r.Rdx & mask8, nil
+	case x86asm.BL:
+		return r.Rbx & mask8, nil
+	case x86asm.AH:
+		return (r.Rax >> 8) & mask8, nil
+	case x86asm.CH:
+		return (r.Rcx >> 8) & mask8, nil
+	case x86asm.DH:
+		return (r.Rdx >> 8) & mask8, nil
+	case x86asm.BH:
+		return (r.Rbx >> 8) & mask8, nil
+	case x86asm.SPB:
+		return r.Rsp & mask8, nil
+	case x86asm.BPB:
+		return r.Rbp & mask8, nil
+	case x86asm.SIB:
+		return r.Rsi & mask8, nil
+	case x86asm.DIB:
+		return r.Rdi & mask8, nil
+	case x86asm.R8B:
+		return r.R8 & mask8, nil
+	case x86asm.R9B:
+		return r.R9 & mask8, nil
+	case x86asm.R10B:
+		return r.R10 & mask8, nil
+	case x86asm.R11B:
+		return r.R11 & mask8, nil
+	case x86asm.R12B:
+		return r.R12 & mask8, nil
+	case x86asm.R13B:
+		return r.R13 & mask8, nil
+	case x86asm.R14B:
+		return r.R14 & mask8, nil
+	case x86asm.R15B:
+		return r.R15 & mask8, nil
+
+	// 16-bit
+	case x86asm.AX:
+		return r.Rax & mask16, nil
+	case x86asm.CX:
+		return r.Rcx & mask16, nil
+	case x86asm.DX:
+		return r.Rdx & mask16, nil
+	case x86asm.BX:
+		return r.Rbx & mask16, nil
+	case x86asm.SP:
+		return r.Rsp & mask16, nil
+	case x86asm.BP:
+		return r.Rbp & mask16, nil
+	case x86asm.SI:
+		return r.Rsi & mask16, nil
+	case x86asm.DI:
+		return r.Rdi & mask16, nil
+	case x86asm.R8W:
+		return r.R8 & mask16, nil
+	case x86asm.R9W:
+		return r.R9 & mask16, nil
+	case x86asm.R10W:
+		return r.R10 & mask16, nil
+	case x86asm.R11W:
+		return r.R11 & mask16, nil
+	case x86asm.R12W:
+		return r.R12 & mask16, nil
+	case x86asm.R13W:
+		return r.R13 & mask16, nil
+	case x86asm.R14W:
+		return r.R14 & mask16, nil
+	case x86asm.R15W:
+		return r.R15 & mask16, nil
+
+	// 32-bit
+	case x86asm.EAX:
+		return r.Rax & mask32, nil
+	case x86asm.ECX:
+		return r.Rcx & mask32, nil
+	case x86asm.EDX:
+		return r.Rdx & mask32, nil
+	case x86asm.EBX:
+		return r.Rbx & mask32, nil
+	case x86asm.ESP:
+		return r.Rsp & mask32, nil
+	case x86asm.EBP:
+		return r.Rbp & mask32, nil
+	case x86asm.ESI:
+		return r.Rsi & mask32, nil
+	case x86asm.EDI:
+		return r.Rdi & mask32, nil
+	case x86asm.R8L:
+		return r.R8 & mask32, nil
+	case x86asm.R9L:
+		return r.R9 & mask32, nil
+	case x86asm.R10L:
+		return r.R10 & mask32, nil
+	case x86asm.R11L:
+		return r.R11 & mask32, nil
+	case x86asm.R12L:
+		return r.R12 & mask32, nil
+	case x86asm.R13L:
+		return r.R13 & mask32, nil
+	case x86asm.R14L:
+		return r.R14 & mask32, nil
+	case x86asm.R15L:
+		return r.R15 & mask32, nil
+
+	// 64-bit
+	case x86asm.RAX:
+		return r.Rax, nil
+	case x86asm.RCX:
+		return r.Rcx, nil
+	case x86asm.RDX:
+		return r.Rdx, nil
+	case x86asm.RBX:
+		return r.Rbx, nil
+	case x86asm.RSP:
+		return r.Rsp, nil
+	case x86asm.RBP:
+		return r.Rbp, nil
+	case x86asm.RSI:
+		return r.Rsi, nil
+	case x86asm.RDI:
+		return r.Rdi, nil
+	case x86asm.R8:
+		return r.R8, nil
+	case x86asm.R9:
+		return r.R9, nil
+	case x86asm.R10:
+		return r.R10, nil
+	case x86asm.R11:
+		return r.R11, nil
+	case x86asm.R12:
+		return r.R12, nil
+	case x86asm.R13:
+		return r.R13, nil
+	case x86asm.R14:
+		return r.R14, nil
+	case x86asm.R15:
+		return r.R15, nil
+	}
+
+	return 0, proc.ErrUnknownRegister
+}
+
+// readCore reads a core file from corePath corresponding to the executable at
+// exePath. For details on the Linux ELF core format, see:
+// http://www.gabriel.urdhr.fr/2015/05/29/core-file/,
+// http://uhlo.blogspot.fr/2012/05/brief-look-into-core-dumps.html,
+// elf_core_dump in http://lxr.free-electrons.com/source/fs/binfmt_elf.c,
+// and, if absolutely desperate, readelf.c from the binutils source.
+func readCore(corePath, exePath string) (*Core, error) {
+	coreFile, err := elf.Open(corePath)
+	if err != nil {
+		return nil, err
+	}
+	exe, err := os.Open(exePath)
+	if err != nil {
+		return nil, err
+	}
+	exeELF, err := elf.NewFile(exe)
+	if err != nil {
+		return nil, err
+	}
+
+	if coreFile.Type != elf.ET_CORE {
+		return nil, fmt.Errorf("%v is not a core file", coreFile)
+	}
+	if exeELF.Type != elf.ET_EXEC && exeELF.Type != elf.ET_DYN {
+		return nil, fmt.Errorf("%v is not an exe file", exeELF)
+	}
+
+	notes, err := readNotes(coreFile)
+	if err != nil {
+		return nil, err
+	}
+	memory := buildMemory(coreFile, exeELF, exe, notes)
+	entryPoint := findEntryPoint(notes)
+
+	core := &Core{
+		MemoryReader: memory,
+		Threads:      map[int]*Thread{},
+		entryPoint:   entryPoint,
+	}
+
+	var lastThread *Thread
+	for _, note := range notes {
+		switch note.Type {
+		case elf.NT_PRSTATUS:
+			t := note.Desc.(*LinuxPrStatus)
+			lastThread = &Thread{t, nil, nil, proc.CommonThread{}}
+			core.Threads[int(t.Pid)] = lastThread
+		case NT_X86_XSTATE:
+			if lastThread != nil {
+				lastThread.fpregs = note.Desc.(*proc.LinuxX86Xstate).Decode()
+			}
+		case elf.NT_PRPSINFO:
+			core.Pid = int(note.Desc.(*LinuxPrPsInfo).Pid)
+		}
+	}
+	return core, nil
+}
+
+// Core represents a core file.
+type Core struct {
+	proc.MemoryReader
+	Threads map[int]*Thread
+	Pid     int
+
+	entryPoint uint64
+}
+
+// Note is a note from the PT_NOTE prog.
+// Relevant types:
+// - NT_FILE: File mapping information, e.g. program text mappings. Desc is a LinuxNTFile.
+// - NT_PRPSINFO: Information about a process, including PID and signal. Desc is a LinuxPrPsInfo.
+// - NT_PRSTATUS: Information about a thread, including base registers, state, etc. Desc is a LinuxPrStatus.
+// - NT_FPREGSET (Not implemented): x87 floating point registers.
+// - NT_X86_XSTATE: Other registers, including AVX and such.
+type Note struct {
+	Type elf.NType
+	Name string
+	Desc interface{} // Decoded Desc from the
+}
+
+// readNotes reads all the notes from the notes prog in core.
+func readNotes(core *elf.File) ([]*Note, error) {
+	var notesProg *elf.Prog
+	for _, prog := range core.Progs {
+		if prog.Type == elf.PT_NOTE {
+			notesProg = prog
+			break
+		}
+	}
+
+	r := notesProg.Open()
+	notes := []*Note{}
+	for {
+		note, err := readNote(r)
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return nil, err
+		}
+		notes = append(notes, note)
+	}
+
+	return notes, nil
+}
+
+// readNote reads a single note from r, decoding the descriptor if possible.
+func readNote(r io.ReadSeeker) (*Note, error) {
+	// Notes are laid out as described in the SysV ABI:
+	// http://www.sco.com/developers/gabi/latest/ch5.pheader.html#note_section
+	note := &Note{}
+	hdr := &ELFNotesHdr{}
+
+	err := binary.Read(r, binary.LittleEndian, hdr)
+	if err != nil {
+		return nil, err // don't wrap so readNotes sees EOF.
+	}
+	note.Type = elf.NType(hdr.Type)
+
+	name := make([]byte, hdr.Namesz)
+	if _, err := r.Read(name); err != nil {
+		return nil, fmt.Errorf("reading name: %v", err)
+	}
+	note.Name = string(name)
+	if err := skipPadding(r, 4); err != nil {
+		return nil, fmt.Errorf("aligning after name: %v", err)
+	}
+	desc := make([]byte, hdr.Descsz)
+	if _, err := r.Read(desc); err != nil {
+		return nil, fmt.Errorf("reading desc: %v", err)
+	}
+	descReader := bytes.NewReader(desc)
+	switch note.Type {
+	case elf.NT_PRSTATUS:
+		note.Desc = &LinuxPrStatus{}
+		if err := binary.Read(descReader, binary.LittleEndian, note.Desc); err != nil {
+			return nil, fmt.Errorf("reading NT_PRSTATUS: %v", err)
+		}
+	case elf.NT_PRPSINFO:
+		note.Desc = &LinuxPrPsInfo{}
+		if err := binary.Read(descReader, binary.LittleEndian, note.Desc); err != nil {
+			return nil, fmt.Errorf("reading NT_PRPSINFO: %v", err)
+		}
+	case NT_FILE:
+		// No good documentation reference, but the structure is
+		// simply a header, including entry count, followed by that
+		// many entries, and then the file name of each entry,
+		// null-delimited. Not reading the names here.
+		data := &LinuxNTFile{}
+		if err := binary.Read(descReader, binary.LittleEndian, &data.LinuxNTFileHdr); err != nil {
+			return nil, fmt.Errorf("reading NT_FILE header: %v", err)
+		}
+		for i := 0; i < int(data.Count); i++ {
+			entry := &LinuxNTFileEntry{}
+			if err := binary.Read(descReader, binary.LittleEndian, entry); err != nil {
+				return nil, fmt.Errorf("reading NT_FILE entry %v: %v", i, err)
+			}
+			data.entries = append(data.entries, entry)
+		}
+		note.Desc = data
+	case NT_X86_XSTATE:
+		var fpregs proc.LinuxX86Xstate
+		if err := proc.LinuxX86XstateRead(desc, true, &fpregs); err != nil {
+			return nil, err
+		}
+		note.Desc = &fpregs
+	case NT_AUXV:
+		note.Desc = desc
+	}
+	if err := skipPadding(r, 4); err != nil {
+		return nil, fmt.Errorf("aligning after desc: %v", err)
+	}
+	return note, nil
+}
+
+// skipPadding moves r to the next multiple of pad.
+func skipPadding(r io.ReadSeeker, pad int64) error {
+	pos, err := r.Seek(0, os.SEEK_CUR)
+	if err != nil {
+		return err
+	}
+	if pos%pad == 0 {
+		return nil
+	}
+	if _, err := r.Seek(pad-(pos%pad), os.SEEK_CUR); err != nil {
+		return err
+	}
+	return nil
+}
+
+func buildMemory(core, exeELF *elf.File, exe io.ReaderAt, notes []*Note) proc.MemoryReader {
+	memory := &SplicedMemory{}
+
+	// For now, assume all file mappings are to the exe.
+	for _, note := range notes {
+		if note.Type == NT_FILE {
+			fileNote := note.Desc.(*LinuxNTFile)
+			for _, entry := range fileNote.entries {
+				r := &OffsetReaderAt{
+					reader: exe,
+					offset: uintptr(entry.Start - (entry.FileOfs * fileNote.PageSize)),
+				}
+				memory.Add(r, uintptr(entry.Start), uintptr(entry.End-entry.Start))
+			}
+
+		}
+	}
+
+	// Load memory segments from exe and then from the core file,
+	// allowing the corefile to overwrite previously loaded segments
+	for _, elfFile := range []*elf.File{exeELF, core} {
+		for _, prog := range elfFile.Progs {
+			if prog.Type == elf.PT_LOAD {
+				if prog.Filesz == 0 {
+					continue
+				}
+				r := &OffsetReaderAt{
+					reader: prog.ReaderAt,
+					offset: uintptr(prog.Vaddr),
+				}
+				memory.Add(r, uintptr(prog.Vaddr), uintptr(prog.Filesz))
+			}
+		}
+	}
+	return memory
+}
+
+func findEntryPoint(notes []*Note) uint64 {
+	for _, note := range notes {
+		if note.Type == NT_AUXV {
+			return linutil.EntryPointFromAuxvAMD64(note.Desc.([]byte))
+		}
+	}
+	return 0
+}
+
+// LinuxPrPsInfo has various structures from the ELF spec and the Linux kernel.
+// AMD64 specific primarily because of unix.PtraceRegs, but also
+// because some of the fields are word sized.
+// See http://lxr.free-electrons.com/source/include/uapi/linux/elfcore.h
+type LinuxPrPsInfo struct {
+	State                uint8
+	Sname                int8
+	Zomb                 uint8
+	Nice                 int8
+	_                    [4]uint8
+	Flag                 uint64
+	Uid, Gid             uint32
+	Pid, Ppid, Pgrp, Sid int32
+	Fname                [16]uint8
+	Args                 [80]uint8
+}
+
+// LinuxPrStatus is a copy of the prstatus kernel struct.
+type LinuxPrStatus struct {
+	Siginfo                      LinuxSiginfo
+	Cursig                       uint16
+	_                            [2]uint8
+	Sigpend                      uint64
+	Sighold                      uint64
+	Pid, Ppid, Pgrp, Sid         int32
+	Utime, Stime, CUtime, CStime LinuxCoreTimeval
+	Reg                          LinuxCoreRegisters
+	Fpvalid                      int32
+}
+
+// LinuxSiginfo is a copy of the
+// siginfo kernel struct.
+type LinuxSiginfo struct {
+	Signo int32
+	Code  int32
+	Errno int32
+}
+
+// LinuxNTFile contains information on mapped files.
+type LinuxNTFile struct {
+	LinuxNTFileHdr
+	entries []*LinuxNTFileEntry
+}
+
+// LinuxNTFileHdr is a header struct for NTFile.
+type LinuxNTFileHdr struct {
+	Count    uint64
+	PageSize uint64
+}
+
+// LinuxNTFileEntry is an entry of an NT_FILE note.
+type LinuxNTFileEntry struct {
+	Start   uint64
+	End     uint64
+	FileOfs uint64
+}
+
+// ELFNotesHdr is the ELF Notes header.
+// Same size on 64 and 32-bit machines.
+type ELFNotesHdr struct {
+	Namesz uint32
+	Descsz uint32
+	Type   uint32
+}

vendor/github.com/derekparker/delve/pkg/proc/disasm.go

@@ -0,0 +1,121 @@
+package proc
+
+import "sort"
+
+// AsmInstruction represents one assembly instruction.
+type AsmInstruction struct {
+	Loc        Location
+	DestLoc    *Location
+	Bytes      []byte
+	Breakpoint bool
+	AtPC       bool
+	Inst       *archInst
+}
+
+// AssemblyFlavour is the assembly syntax to display.
+type AssemblyFlavour int
+
+const (
+	// GNUFlavour will display GNU assembly syntax.
+	GNUFlavour = AssemblyFlavour(iota)
+	// IntelFlavour will display Intel assembly syntax.
+	IntelFlavour
+	// GoFlavour will display Go assembly syntax.
+	GoFlavour
+)
+
+// Disassemble disassembles target memory between startPC and endPC, marking
+// the current instruction being executed in goroutine g.
+// If currentGoroutine is set and thread is stopped at a CALL instruction Disassemble will evaluate the argument of the CALL instruction using the thread's registers
+// Be aware that the Bytes field of each returned instruction is a slice of a larger array of size endPC - startPC
+func Disassemble(dbp Process, g *G, startPC, endPC uint64) ([]AsmInstruction, error) {
+	if _, err := dbp.Valid(); err != nil {
+		return nil, err
+	}
+	if g == nil {
+		ct := dbp.CurrentThread()
+		regs, _ := ct.Registers(false)
+		return disassemble(ct, regs, dbp.Breakpoints(), dbp.BinInfo(), startPC, endPC, false)
+	}
+
+	var regs Registers
+	var mem MemoryReadWriter = dbp.CurrentThread()
+	if g.Thread != nil {
+		mem = g.Thread
+		regs, _ = g.Thread.Registers(false)
+	}
+
+	return disassemble(mem, regs, dbp.Breakpoints(), dbp.BinInfo(), startPC, endPC, false)
+}
+
+func disassemble(memrw MemoryReadWriter, regs Registers, breakpoints *BreakpointMap, bi *BinaryInfo, startPC, endPC uint64, singleInstr bool) ([]AsmInstruction, error) {
+	mem := make([]byte, int(endPC-startPC))
+	_, err := memrw.ReadMemory(mem, uintptr(startPC))
+	if err != nil {
+		return nil, err
+	}
+
+	r := make([]AsmInstruction, 0, len(mem)/15)
+	pc := startPC
+
+	var curpc uint64
+	if regs != nil {
+		curpc = regs.PC()
+	}
+
+	for len(mem) > 0 {
+		bp, atbp := breakpoints.M[pc]
+		if atbp {
+			for i := range bp.OriginalData {
+				mem[i] = bp.OriginalData[i]
+			}
+		}
+		file, line, fn := bi.PCToLine(pc)
+		loc := Location{PC: pc, File: file, Line: line, Fn: fn}
+		inst, err := asmDecode(mem, pc)
+		if err == nil {
+			atpc := (regs != nil) && (curpc == pc)
+			destloc := resolveCallArg(inst, atpc, regs, memrw, bi)
+			r = append(r, AsmInstruction{Loc: loc, DestLoc: destloc, Bytes: mem[:inst.Len], Breakpoint: atbp, AtPC: atpc, Inst: inst})
+
+			pc += uint64(inst.Size())
+			mem = mem[inst.Size():]
+		} else {
+			r = append(r, AsmInstruction{Loc: loc, Bytes: mem[:1], Breakpoint: atbp, Inst: nil})
+			pc++
+			mem = mem[1:]
+		}
+		if singleInstr {
+			break
+		}
+	}
+	return r, nil
+}
+
+// Looks up symbol (either functions or global variables) at address addr.
+// Used by disassembly formatter.
+func (bi *BinaryInfo) symLookup(addr uint64) (string, uint64) {
+	fn := bi.PCToFunc(addr)
+	if fn != nil {
+		if fn.Entry == addr {
+			// only report the function name if it's the exact address because it's
+			// easier to read the absolute address than function_name+offset.
+			return fn.Name, fn.Entry
+		}
+		return "", 0
+	}
+	i := sort.Search(len(bi.packageVars), func(i int) bool {
+		return bi.packageVars[i].addr >= addr
+	})
+	if i >= len(bi.packageVars) {
+		return "", 0
+	}
+	if bi.packageVars[i].addr > addr {
+		// report previous variable + offset if i-th variable starts after addr
+		i--
+	}
+	if i > 0 {
+		return bi.packageVars[i].name, bi.packageVars[i].addr
+	}
+	return "", 0
+}

vendor/github.com/derekparker/delve/pkg/proc/disasm_amd64.go

@@ -1,26 +1,26 @@
 package proc
 
 import (
-	"debug/gosym"
 	"encoding/binary"
-	"rsc.io/x86/x86asm"
+
+	"golang.org/x/arch/x86/x86asm"
 )
 
 var maxInstructionLength uint64 = 15
 
-type ArchInst x86asm.Inst
+type archInst x86asm.Inst
 
-func asmDecode(mem []byte, pc uint64) (*ArchInst, error) {
+func asmDecode(mem []byte, pc uint64) (*archInst, error) {
 	inst, err := x86asm.Decode(mem, 64)
 	if err != nil {
 		return nil, err
 	}
 	patchPCRel(pc, &inst)
-	r := ArchInst(inst)
+	r := archInst(inst)
 	return &r, nil
 }
 
-func (inst *ArchInst) Size() int {
+func (inst *archInst) Size() int {
 	return inst.Len
 }
 
@@ -32,10 +32,11 @@ func patchPCRel(pc uint64, inst *x86asm.Inst) {
 			inst.Args[i] = x86asm.Imm(int64(pc) + int64(rel) + int64(inst.Len))
 		}
 	}
-	return
 }
 
-func (inst *AsmInstruction) Text(flavour AssemblyFlavour) string {
+// Text will return the assembly instructions in human readable format according to
+// the flavour specified.
+func (inst *AsmInstruction) Text(flavour AssemblyFlavour, bi *BinaryInfo) string {
 	if inst.Inst == nil {
 		return "?"
 	}
@@ -44,25 +45,27 @@ func (inst *AsmInstruction) Text(flavour AssemblyFlavour) string {
 
 	switch flavour {
 	case GNUFlavour:
-		text = x86asm.GNUSyntax(x86asm.Inst(*inst.Inst))
+		text = x86asm.GNUSyntax(x86asm.Inst(*inst.Inst), inst.Loc.PC, bi.symLookup)
+	case GoFlavour:
+		text = x86asm.GoSyntax(x86asm.Inst(*inst.Inst), inst.Loc.PC, bi.symLookup)
 	case IntelFlavour:
 		fallthrough
 	default:
-		text = x86asm.IntelSyntax(x86asm.Inst(*inst.Inst))
+		text = x86asm.IntelSyntax(x86asm.Inst(*inst.Inst), inst.Loc.PC, bi.symLookup)
-	}
-
-	if inst.IsCall() && inst.DestLoc != nil && inst.DestLoc.Fn != nil {
-		text += " " + inst.DestLoc.Fn.Name
 	}
 
 	return text
 }
 
+// IsCall returns true if the instruction is a CALL or LCALL instruction.
 func (inst *AsmInstruction) IsCall() bool {
+	if inst.Inst == nil {
+		return false
+	}
 	return inst.Inst.Op == x86asm.CALL || inst.Inst.Op == x86asm.LCALL
 }
 
-func (thread *Thread) resolveCallArg(inst *ArchInst, currentGoroutine bool, regs Registers) *Location {
+func resolveCallArg(inst *archInst, currentGoroutine bool, regs Registers, mem MemoryReadWriter, bininfo *BinaryInfo) *Location {
 	if inst.Op != x86asm.CALL && inst.Op != x86asm.LCALL {
 		return nil
 	}
@@ -88,10 +91,6 @@ func (thread *Thread) resolveCallArg(inst *ArchInst, currentGoroutine bool, regs
 		if arg.Segment != 0 {
 			return nil
 		}
-		regs, err := thread.Registers(false)
-		if err != nil {
-			return nil
-		}
 		base, err1 := regs.Get(int(arg.Base))
 		index, err2 := regs.Get(int(arg.Index))
 		if err1 != nil || err2 != nil {
@@ -99,7 +98,8 @@ func (thread *Thread) resolveCallArg(inst *ArchInst, currentGoroutine bool, regs
 		}
 		addr := uintptr(int64(base) + int64(index*uint64(arg.Scale)) + arg.Disp)
 		//TODO: should this always be 64 bits instead of inst.MemBytes?
-		pcbytes, err := thread.readMemory(addr, inst.MemBytes)
+		pcbytes := make([]byte, inst.MemBytes)
+		_, err := mem.ReadMemory(pcbytes, addr)
 		if err != nil {
 			return nil
 		}
@@ -108,7 +108,7 @@ func (thread *Thread) resolveCallArg(inst *ArchInst, currentGoroutine bool, regs
 		return nil
 	}
 
-	file, line, fn := thread.dbp.PCToLine(pc)
+	file, line, fn := bininfo.PCToLine(pc)
 	if fn == nil {
 		return nil
 	}
@@ -142,10 +142,16 @@ func init() {
 	}
 }
 
-// FirstPCAfterPrologue returns the address of the first instruction after the prologue for function fn
+// firstPCAfterPrologueDisassembly returns the address of the first
-// If sameline is set FirstPCAfterPrologue will always return an address associated with the same line as fn.Entry
+// instruction after the prologue for function fn by disassembling fn and
-func (dbp *Process) FirstPCAfterPrologue(fn *gosym.Func, sameline bool) (uint64, error) {
+// matching the instructions against known split-stack prologue patterns.
-	text, err := dbp.CurrentThread.Disassemble(fn.Entry, fn.End, false)
+// If sameline is set firstPCAfterPrologueDisassembly will always return an
+// address associated with the same line as fn.Entry
+func firstPCAfterPrologueDisassembly(p Process, fn *Function, sameline bool) (uint64, error) {
+	var mem MemoryReadWriter = p.CurrentThread()
+	breakpoints := p.Breakpoints()
+	bi := p.BinInfo()
+	text, err := disassemble(mem, nil, breakpoints, bi, fn.Entry, fn.End, false)
 	if err != nil {
 		return fn.Entry, err
 	}

vendor/github.com/derekparker/delve/pkg/proc/eval.go

@@ -3,6 +3,7 @@ package proc
 import (
 	"bytes"
 	"encoding/binary"
+	"errors"
 	"fmt"
 	"go/ast"
 	"go/constant"
@@ -10,11 +11,16 @@ import (
 	"go/printer"
 	"go/token"
 	"reflect"
+	"strconv"
+	"strings"
 
-	"github.com/derekparker/delve/dwarf/reader"
+	"github.com/derekparker/delve/pkg/dwarf/godwarf"
-	"golang.org/x/debug/dwarf"
+	"github.com/derekparker/delve/pkg/dwarf/reader"
+	"github.com/derekparker/delve/pkg/goversion"
 )
 
+var errOperationOnSpecialFloat = errors.New("operations on non-finite floats not implemented")
+
 // EvalExpression returns the value of the given expression.
 func (scope *EvalScope) EvalExpression(expr string, cfg LoadConfig) (*Variable, error) {
 	t, err := parser.ParseExpr(expr)
@@ -22,7 +28,10 @@ func (scope *EvalScope) EvalExpression(expr string, cfg LoadConfig) (*Variable,
 		return nil, err
 	}
 
-	ev, err := scope.evalAST(t)
+	ev, err := scope.evalToplevelTypeCast(t, cfg)
+	if ev == nil && err == nil {
+		ev, err = scope.evalAST(t)
+	}
 	if err != nil {
 		return nil, err
 	}
@@ -33,6 +42,123 @@ func (scope *EvalScope) EvalExpression(expr string, cfg LoadConfig) (*Variable,
 	return ev, nil
 }
 
+// evalToplevelTypeCast implements certain type casts that we only support
+// at the outermost levels of an expression.
+func (scope *EvalScope) evalToplevelTypeCast(t ast.Expr, cfg LoadConfig) (*Variable, error) {
+	call, _ := t.(*ast.CallExpr)
+	if call == nil || len(call.Args) != 1 {
+		return nil, nil
+	}
+	targetTypeStr := exprToString(removeParen(call.Fun))
+	var targetType godwarf.Type
+	switch targetTypeStr {
+	case "[]byte", "[]uint8":
+		targetType = fakeSliceType(&godwarf.IntType{BasicType: godwarf.BasicType{CommonType: godwarf.CommonType{ByteSize: 1, Name: "uint8"}, BitSize: 8, BitOffset: 0}})
+	case "[]int32", "[]rune":
+		targetType = fakeSliceType(&godwarf.IntType{BasicType: godwarf.BasicType{CommonType: godwarf.CommonType{ByteSize: 1, Name: "int32"}, BitSize: 32, BitOffset: 0}})
+	case "string":
+		var err error
+		targetType, err = scope.BinInfo.findType("string")
+		if err != nil {
+			return nil, err
+		}
+	default:
+		return nil, nil
+	}
+
+	argv, err := scope.evalToplevelTypeCast(call.Args[0], cfg)
+	if argv == nil && err == nil {
+		argv, err = scope.evalAST(call.Args[0])
+	}
+	if err != nil {
+		return nil, err
+	}
+	argv.loadValue(cfg)
+	if argv.Unreadable != nil {
+		return nil, argv.Unreadable
+	}
+
+	v := newVariable("", 0, targetType, scope.BinInfo, scope.Mem)
+	v.loaded = true
+
+	converr := fmt.Errorf("can not convert %q to %s", exprToString(call.Args[0]), targetTypeStr)
+
+	switch targetTypeStr {
+	case "[]byte", "[]uint8":
+		if argv.Kind != reflect.String {
+			return nil, converr
+		}
+		for i, ch := range []byte(constant.StringVal(argv.Value)) {
+			e := scope.newVariable("", argv.Addr+uintptr(i), targetType.(*godwarf.SliceType).ElemType, argv.mem)
+			e.loaded = true
+			e.Value = constant.MakeInt64(int64(ch))
+			v.Children = append(v.Children, *e)
+		}
+		v.Len = int64(len(v.Children))
+		v.Cap = v.Len
+		return v, nil
+
+	case "[]int32", "[]rune":
+		if argv.Kind != reflect.String {
+			return nil, converr
+		}
+		for i, ch := range constant.StringVal(argv.Value) {
+			e := scope.newVariable("", argv.Addr+uintptr(i), targetType.(*godwarf.SliceType).ElemType, argv.mem)
+			e.loaded = true
+			e.Value = constant.MakeInt64(int64(ch))
+			v.Children = append(v.Children, *e)
+		}
+		v.Len = int64(len(v.Children))
+		v.Cap = v.Len
+		return v, nil
+
+	case "string":
+		switch argv.Kind {
+		case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint, reflect.Uintptr:
+			b, _ := constant.Int64Val(argv.Value)
+			s := string(b)
+			v.Value = constant.MakeString(s)
+			v.Len = int64(len(s))
+			return v, nil
+
+		case reflect.Slice:
+			switch elemType := argv.RealType.(*godwarf.SliceType).ElemType.(type) {
+			case *godwarf.UintType:
+				if elemType.Name != "uint8" && elemType.Name != "byte" {
+					return nil, nil
+				}
+				bytes := make([]byte, len(argv.Children))
+				for i := range argv.Children {
+					n, _ := constant.Int64Val(argv.Children[i].Value)
+					bytes[i] = byte(n)
+				}
+				v.Value = constant.MakeString(string(bytes))
+
+			case *godwarf.IntType:
+				if elemType.Name != "int32" && elemType.Name != "rune" {
+					return nil, nil
+				}
+				runes := make([]rune, len(argv.Children))
+				for i := range argv.Children {
+					n, _ := constant.Int64Val(argv.Children[i].Value)
+					runes[i] = rune(n)
+				}
+				v.Value = constant.MakeString(string(runes))
+
+			default:
+				return nil, nil
+			}
+			v.Len = int64(len(constant.StringVal(v.Value)))
+			return v, nil
+
+		default:
+			return nil, nil
+		}
+	}
+
+	return nil, nil
+}
+
 func (scope *EvalScope) evalAST(t ast.Expr) (*Variable, error) {
 	switch node := t.(type) {
 	case *ast.CallExpr:
@@ -64,11 +190,25 @@ func (scope *EvalScope) evalAST(t ast.Expr) (*Variable, error) {
 		// try to interpret the selector as a package variable
 		if maybePkg, ok := node.X.(*ast.Ident); ok {
 			if maybePkg.Name == "runtime" && node.Sel.Name == "curg" {
-				return scope.Thread.getGVariable()
+				if scope.Gvar == nil {
-			} else if v, err := scope.packageVarAddr(maybePkg.Name + "." + node.Sel.Name); err == nil {
+					return nilVariable, nil
+				}
+				return scope.Gvar.clone(), nil
+			} else if maybePkg.Name == "runtime" && node.Sel.Name == "frameoff" {
+				return newConstant(constant.MakeInt64(scope.frameOffset), scope.Mem), nil
+			} else if v, err := scope.findGlobal(maybePkg.Name + "." + node.Sel.Name); err == nil {
 				return v, nil
 			}
 		}
+		// try to accept "package/path".varname syntax for package variables
+		if maybePkg, ok := node.X.(*ast.BasicLit); ok && maybePkg.Kind == token.STRING {
+			pkgpath, err := strconv.Unquote(maybePkg.Value)
+			if err == nil {
+				if v, err := scope.findGlobal(pkgpath + "." + node.Sel.Name); err == nil {
+					return v, nil
+				}
+			}
+		}
 		// if it's not a package variable then it must be a struct member access
 		return scope.evalStructSelector(node)
 
@@ -102,7 +242,7 @@ func (scope *EvalScope) evalAST(t ast.Expr) (*Variable, error) {
 		return scope.evalBinary(node)
 
 	case *ast.BasicLit:
-		return newConstant(constant.MakeFromLiteral(node.Value, node.Kind, 0), scope.Thread), nil
+		return newConstant(constant.MakeFromLiteral(node.Value, node.Kind, 0), scope.Mem), nil
 
 	default:
 		return nil, fmt.Errorf("expression %T not implemented", t)
@@ -116,6 +256,17 @@ func exprToString(t ast.Expr) string {
 	return buf.String()
 }
 
+func removeParen(n ast.Expr) ast.Expr {
+	for {
+		p, ok := n.(*ast.ParenExpr)
+		if !ok {
+			break
+		}
+		n = p.X
+	}
+	return n
+}
+
 // Eval type cast expressions
 func (scope *EvalScope) evalTypeCast(node *ast.CallExpr) (*Variable, error) {
 	argv, err := scope.evalAST(node.Args[0])
@@ -130,15 +281,9 @@ func (scope *EvalScope) evalTypeCast(node *ast.CallExpr) (*Variable, error) {
 	fnnode := node.Fun
 
 	// remove all enclosing parenthesis from the type name
-	for {
+	fnnode = removeParen(fnnode)
-		p, ok := fnnode.(*ast.ParenExpr)
-		if !ok {
-			break
-		}
-		fnnode = p.X
-	}
 
-	styp, err := scope.Thread.dbp.findTypeExpr(fnnode)
+	styp, err := scope.BinInfo.findTypeExpr(fnnode)
 	if err != nil {
 		return nil, err
 	}
@@ -146,11 +291,11 @@ func (scope *EvalScope) evalTypeCast(node *ast.CallExpr) (*Variable, error) {
 
 	converr := fmt.Errorf("can not convert %q to %s", exprToString(node.Args[0]), typ.String())
 
-	v := newVariable("", 0, styp, scope.Thread.dbp, scope.Thread)
+	v := newVariable("", 0, styp, scope.BinInfo, scope.Mem)
 	v.loaded = true
 
 	switch ttyp := typ.(type) {
-	case *dwarf.PtrType:
+	case *godwarf.PtrType:
 		switch argv.Kind {
 		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
 			// ok
@@ -162,10 +307,10 @@ func (scope *EvalScope) evalTypeCast(node *ast.CallExpr) (*Variable, error) {
 
 		n, _ := constant.Int64Val(argv.Value)
 
-		v.Children = []Variable{*(scope.newVariable("", uintptr(n), ttyp.Type))}
+		v.Children = []Variable{*(scope.newVariable("", uintptr(n), ttyp.Type, scope.Mem))}
 		return v, nil
 
-	case *dwarf.UintType:
+	case *godwarf.UintType:
 		switch argv.Kind {
 		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
 			n, _ := constant.Int64Val(argv.Value)
@@ -179,8 +324,11 @@ func (scope *EvalScope) evalTypeCast(node *ast.CallExpr) (*Variable, error) {
 			x, _ := constant.Float64Val(argv.Value)
 			v.Value = constant.MakeUint64(uint64(x))
 			return v, nil
+		case reflect.Ptr:
+			v.Value = constant.MakeUint64(uint64(argv.Children[0].Addr))
+			return v, nil
 		}
-	case *dwarf.IntType:
+	case *godwarf.IntType:
 		switch argv.Kind {
 		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
 			n, _ := constant.Int64Val(argv.Value)
@@ -195,7 +343,7 @@ func (scope *EvalScope) evalTypeCast(node *ast.CallExpr) (*Variable, error) {
 			v.Value = constant.MakeInt64(int64(x))
 			return v, nil
 		}
-	case *dwarf.FloatType:
+	case *godwarf.FloatType:
 		switch argv.Kind {
 		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
 			fallthrough
@@ -205,7 +353,7 @@ func (scope *EvalScope) evalTypeCast(node *ast.CallExpr) (*Variable, error) {
 			v.Value = argv.Value
 			return v, nil
 		}
-	case *dwarf.ComplexType:
+	case *godwarf.ComplexType:
 		switch argv.Kind {
 		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
 			fallthrough
@@ -370,10 +518,10 @@ func complexBuiltin(args []*Variable, nodeargs []ast.Expr) (*Variable, error) {
 
 	sz := int64(0)
 	if realev.RealType != nil {
-		sz = realev.RealType.(*dwarf.FloatType).Size()
+		sz = realev.RealType.(*godwarf.FloatType).Size()
 	}
 	if imagev.RealType != nil {
-		isz := imagev.RealType.(*dwarf.FloatType).Size()
+		isz := imagev.RealType.(*godwarf.FloatType).Size()
 		if isz > sz {
 			sz = isz
 		}
@@ -383,9 +531,9 @@ func complexBuiltin(args []*Variable, nodeargs []ast.Expr) (*Variable, error) {
 		sz = 128
 	}
 
-	typ := &dwarf.ComplexType{BasicType: dwarf.BasicType{CommonType: dwarf.CommonType{ByteSize: int64(sz / 8), Name: fmt.Sprintf("complex%d", sz)}, BitSize: sz, BitOffset: 0}}
+	typ := &godwarf.ComplexType{BasicType: godwarf.BasicType{CommonType: godwarf.CommonType{ByteSize: int64(sz / 8), Name: fmt.Sprintf("complex%d", sz)}, BitSize: sz, BitOffset: 0}}
 
-	r := realev.newVariable("", 0, typ)
+	r := realev.newVariable("", 0, typ, nil)
 	r.Value = constant.BinaryOp(realev.Value, token.ADD, constant.MakeImag(imagev.Value))
 	return r, nil
 }
@@ -432,33 +580,29 @@ func realBuiltin(args []*Variable, nodeargs []ast.Expr) (*Variable, error) {
 func (scope *EvalScope) evalIdent(node *ast.Ident) (*Variable, error) {
 	switch node.Name {
 	case "true", "false":
-		return newConstant(constant.MakeBool(node.Name == "true"), scope.Thread), nil
+		return newConstant(constant.MakeBool(node.Name == "true"), scope.Mem), nil
 	case "nil":
 		return nilVariable, nil
 	}
 
-	// try to interpret this as a local variable
+	vars, err := scope.Locals()
-	v, err := scope.extractVarInfo(node.Name)
+	if err != nil {
-	if err == nil {
+		return nil, err
-		return v, nil
 	}
-	origErr := err
+	for i := range vars {
-	// workaround: sometimes go inserts an entry for '&varname' instead of varname
+		if vars[i].Name == node.Name && vars[i].Flags&VariableShadowed == 0 {
-	v, err = scope.extractVarInfo("&" + node.Name)
+			return vars[i], nil
-	if err == nil {
+		}
-		v = v.maybeDereference()
-		v.Name = node.Name
-		return v, nil
 	}
+
 	// if it's not a local variable then it could be a package variable w/o explicit package name
-	_, _, fn := scope.Thread.dbp.PCToLine(scope.PC)
+	if scope.Fn != nil {
-	if fn != nil {
+		if v, err := scope.findGlobal(scope.Fn.PackageName() + "." + node.Name); err == nil {
-		if v, err = scope.packageVarAddr(fn.PackageName() + "." + node.Name); err == nil {
 			v.Name = node.Name
 			return v, nil
 		}
 	}
-	return nil, origErr
+	return nil, fmt.Errorf("could not find symbol value for %s", node.Name)
 }
 
 // Evaluates expressions <subexpr>.<field name> where subexpr is not a package name
@@ -467,6 +611,13 @@ func (scope *EvalScope) evalStructSelector(node *ast.SelectorExpr) (*Variable, e
 	if err != nil {
 		return nil, err
 	}
+	rv, err := xv.findMethod(node.Sel.Name)
+	if err != nil {
+		return nil, err
+	}
+	if rv != nil {
+		return rv, nil
+	}
 	return xv.structMember(node.Sel.Name)
 }
 
@@ -489,13 +640,23 @@ func (scope *EvalScope) evalTypeAssert(node *ast.TypeAssertExpr) (*Variable, err
 	if xv.Children[0].Addr == 0 {
 		return nil, fmt.Errorf("interface conversion: %s is nil, not %s", xv.DwarfType.String(), exprToString(node.Type))
 	}
-	typ, err := scope.Thread.dbp.findTypeExpr(node.Type)
+	// Accept .(data) as a type assertion that always succeeds, so that users
-	if err != nil {
+	// can access the data field of an interface without actually having to
-		return nil, err
+	// type the concrete type.
-	}
+	if idtyp, isident := node.Type.(*ast.Ident); !isident || idtyp.Name != "data" {
-	if xv.Children[0].DwarfType.Common().Name != typ.Common().Name {
+		typ, err := scope.BinInfo.findTypeExpr(node.Type)
-		return nil, fmt.Errorf("interface conversion: %s is %s, not %s", xv.DwarfType.Common().Name, xv.Children[0].TypeString(), typ.Common().Name)
+		if err != nil {
+			return nil, err
+		}
+		if xv.Children[0].DwarfType.Common().Name != typ.Common().Name {
+			return nil, fmt.Errorf("interface conversion: %s is %s, not %s", xv.DwarfType.Common().Name, xv.Children[0].TypeString(), typ.Common().Name)
+		}
 	}
+	// loadInterface will set OnlyAddr for the data member since here we are
+	// passing false to loadData, however returning the variable with OnlyAddr
+	// set here would be wrong since, once the expression evaluation
+	// terminates, the value of this variable will be loaded.
+	xv.Children[0].OnlyAddr = false
 	return &xv.Children[0], nil
 }
 
@@ -509,12 +670,27 @@ func (scope *EvalScope) evalIndex(node *ast.IndexExpr) (*Variable, error) {
 		return nil, xev.Unreadable
 	}
 
+	xev = xev.maybeDereference()
+
 	idxev, err := scope.evalAST(node.Index)
 	if err != nil {
 		return nil, err
 	}
 
+	cantindex := fmt.Errorf("expression \"%s\" (%s) does not support indexing", exprToString(node.X), xev.TypeString())
+
 	switch xev.Kind {
+	case reflect.Ptr:
+		if xev == nilVariable {
+			return nil, cantindex
+		}
+		_, isarrptr := xev.RealType.(*godwarf.PtrType).Type.(*godwarf.ArrayType)
+		if !isarrptr {
+			return nil, cantindex
+		}
+		xev = xev.maybeDereference()
+		fallthrough
+
 	case reflect.Slice, reflect.Array, reflect.String:
 		if xev.Base == 0 {
 			return nil, fmt.Errorf("can not index \"%s\"", exprToString(node.X))
@@ -532,8 +708,7 @@ func (scope *EvalScope) evalIndex(node *ast.IndexExpr) (*Variable, error) {
 		}
 		return xev.mapAccess(idxev)
 	default:
-		return nil, fmt.Errorf("expression \"%s\" (%s) does not support indexing", exprToString(node.X), xev.TypeString())
+		return nil, cantindex
-
 	}
 }
 
@@ -585,9 +760,9 @@ func (scope *EvalScope) evalReslice(node *ast.SliceExpr) (*Variable, error) {
 			return nil, fmt.Errorf("second slice argument must be empty for maps")
 		}
 		xev.mapSkip += int(low)
-		xev.loadValue(loadFullValue)
+		xev.mapIterator() // reads map length
-		if xev.Unreadable != nil {
+		if int64(xev.mapSkip) >= xev.Len {
-			return nil, xev.Unreadable
+			return nil, fmt.Errorf("map index out of bounds")
 		}
 		return xev, nil
 	default:
@@ -631,14 +806,18 @@ func (scope *EvalScope) evalAddrOf(node *ast.UnaryExpr) (*Variable, error) {
 		return nil, fmt.Errorf("can not take address of \"%s\"", exprToString(node.X))
 	}
 
-	xev.OnlyAddr = true
+	return xev.pointerToVariable(), nil
+}
 
-	typename := "*" + xev.DwarfType.Common().Name
+func (v *Variable) pointerToVariable() *Variable {
-	rv := scope.newVariable("", 0, &dwarf.PtrType{CommonType: dwarf.CommonType{ByteSize: int64(scope.Thread.dbp.arch.PtrSize()), Name: typename}, Type: xev.DwarfType})
+	v.OnlyAddr = true
-	rv.Children = []Variable{*xev}
+
+	typename := "*" + v.DwarfType.Common().Name
+	rv := v.newVariable("", 0, &godwarf.PtrType{CommonType: godwarf.CommonType{ByteSize: int64(v.bi.Arch.PtrSize()), Name: typename}, Type: v.DwarfType}, v.mem)
+	rv.Children = []Variable{*v}
 	rv.loaded = true
 
-	return rv, nil
+	return rv
 }
 
 func constantUnaryOp(op token.Token, y constant.Value) (r constant.Value, err error) {
@@ -688,6 +867,9 @@ func (scope *EvalScope) evalUnary(node *ast.UnaryExpr) (*Variable, error) {
 	if xv.Unreadable != nil {
 		return nil, xv.Unreadable
 	}
+	if xv.FloatSpecial != 0 {
+		return nil, errOperationOnSpecialFloat
+	}
 	if xv.Value == nil {
 		return nil, fmt.Errorf("operator %s can not be applied to \"%s\"", node.Op.String(), exprToString(node.X))
 	}
@@ -696,14 +878,14 @@ func (scope *EvalScope) evalUnary(node *ast.UnaryExpr) (*Variable, error) {
 		return nil, err
 	}
 	if xv.DwarfType != nil {
-		r := xv.newVariable("", 0, xv.DwarfType)
+		r := xv.newVariable("", 0, xv.DwarfType, scope.Mem)
 		r.Value = rc
 		return r, nil
 	}
 	return newConstant(rc, xv.mem), nil
 }
 
-func negotiateType(op token.Token, xv, yv *Variable) (dwarf.Type, error) {
+func negotiateType(op token.Token, xv, yv *Variable) (godwarf.Type, error) {
 	if xv == nilVariable {
 		return nil, negotiateTypeNil(op, yv)
 	}
@@ -777,23 +959,36 @@ func (scope *EvalScope) evalBinary(node *ast.BinaryExpr) (*Variable, error) {
 	if err != nil {
 		return nil, err
 	}
+	xv.loadValue(loadFullValue)
+	if xv.Unreadable != nil {
+		return nil, xv.Unreadable
+	}
+
+	// short circuits logical operators
+	switch node.Op {
+	case token.LAND:
+		if !constant.BoolVal(xv.Value) {
+			return newConstant(xv.Value, xv.mem), nil
+		}
+	case token.LOR:
+		if constant.BoolVal(xv.Value) {
+			return newConstant(xv.Value, xv.mem), nil
+		}
+	}
 
 	yv, err := scope.evalAST(node.Y)
 	if err != nil {
 		return nil, err
 	}
-
-	xv.loadValue(loadFullValue)
 	yv.loadValue(loadFullValue)
-
-	if xv.Unreadable != nil {
-		return nil, xv.Unreadable
-	}
-
 	if yv.Unreadable != nil {
 		return nil, yv.Unreadable
 	}
 
+	if xv.FloatSpecial != 0 || yv.FloatSpecial != 0 {
+		return nil, errOperationOnSpecialFloat
+	}
+
 	typ, err := negotiateType(node.Op, xv, yv)
 	if err != nil {
 		return nil, err
@@ -801,8 +996,8 @@ func (scope *EvalScope) evalBinary(node *ast.BinaryExpr) (*Variable, error) {
 
 	op := node.Op
 	if typ != nil && (op == token.QUO) {
-		_, isint := typ.(*dwarf.IntType)
+		_, isint := typ.(*godwarf.IntType)
-		_, isuint := typ.(*dwarf.UintType)
+		_, isuint := typ.(*godwarf.UintType)
 		if isint || isuint {
 			// forces integer division if the result type is integer
 			op = token.QUO_ASSIGN
@@ -835,13 +1030,16 @@ func (scope *EvalScope) evalBinary(node *ast.BinaryExpr) (*Variable, error) {
 			return newConstant(rc, xv.mem), nil
 		}
 
-		r := xv.newVariable("", 0, typ)
+		r := xv.newVariable("", 0, typ, scope.Mem)
 		r.Value = rc
+		if r.Kind == reflect.String {
+			r.Len = xv.Len + yv.Len
+		}
 		return r, nil
 	}
 }
 
-// Comapres xv to yv using operator op
+// Compares xv to yv using operator op
 // Both xv and yv must be loaded and have a compatible type (as determined by negotiateType)
 func compareOp(op token.Token, xv *Variable, yv *Variable) (bool, error) {
 	switch xv.Kind {
@@ -854,6 +1052,14 @@ func compareOp(op token.Token, xv *Variable, yv *Variable) (bool, error) {
 	case reflect.Float32, reflect.Float64, reflect.Complex64, reflect.Complex128:
 		return constantCompare(op, xv.Value, yv.Value)
 	case reflect.String:
+		if xv.Len != yv.Len {
+			switch op {
+			case token.EQL:
+				return false, nil
+			case token.NEQ:
+				return true, nil
+			}
+		}
 		if int64(len(constant.StringVal(xv.Value))) != xv.Len || int64(len(constant.StringVal(yv.Value))) != yv.Len {
 			return false, fmt.Errorf("string too long for comparison")
 		}
@@ -898,7 +1104,7 @@ func compareOp(op token.Token, xv *Variable, yv *Variable) (bool, error) {
 			return false, nil
 		}
 		if int64(len(xv.Children)) != xv.Len || int64(len(yv.Children)) != yv.Len {
-			return false, fmt.Errorf("sturcture too deep for comparison")
+			return false, fmt.Errorf("structure too deep for comparison")
 		}
 		eql, err = equalChildren(xv, yv, false)
 	case reflect.Slice, reflect.Map, reflect.Func, reflect.Chan:
@@ -924,7 +1130,7 @@ func (v *Variable) isNil() bool {
 	case reflect.Ptr:
 		return v.Children[0].Addr == 0
 	case reflect.Interface:
-		return false
+		return v.Children[0].Addr == 0 && v.Children[0].Kind == reflect.Invalid
 	case reflect.Slice, reflect.Map, reflect.Func, reflect.Chan:
 		return v.Base == 0
 	}
@@ -956,7 +1162,7 @@ func (v *Variable) asInt() (int64, error) {
 		if v.Unreadable != nil {
 			return 0, v.Unreadable
 		}
-		if _, ok := v.DwarfType.(*dwarf.IntType); !ok {
+		if _, ok := v.DwarfType.(*godwarf.IntType); !ok {
 			return 0, fmt.Errorf("can not convert value of type %s to int", v.DwarfType.String())
 		}
 	}
@@ -974,7 +1180,7 @@ func (v *Variable) asUint() (uint64, error) {
 		if v.Unreadable != nil {
 			return 0, v.Unreadable
 		}
-		if _, ok := v.DwarfType.(*dwarf.UintType); !ok {
+		if _, ok := v.DwarfType.(*godwarf.UintType); !ok {
 			return 0, fmt.Errorf("can not convert value of type %s to uint", v.DwarfType.String())
 		}
 	}
@@ -982,10 +1188,18 @@ func (v *Variable) asUint() (uint64, error) {
 	return n, nil
 }
 
-func (v *Variable) isType(typ dwarf.Type, kind reflect.Kind) error {
+type typeConvErr struct {
+	srcType, dstType godwarf.Type
+}
+
+func (err *typeConvErr) Error() string {
+	return fmt.Sprintf("can not convert value of type %s to %s", err.srcType.String(), err.dstType.String())
+}
+
+func (v *Variable) isType(typ godwarf.Type, kind reflect.Kind) error {
 	if v.DwarfType != nil {
 		if typ != nil && typ.String() != v.RealType.String() {
-			return fmt.Errorf("can not convert value of type %s to %s", v.DwarfType.String(), typ.String())
+			return &typeConvErr{v.DwarfType, typ}
 		}
 		return nil
 	}
@@ -1010,27 +1224,27 @@ func (v *Variable) isType(typ dwarf.Type, kind reflect.Kind) error {
 	}
 
 	switch typ.(type) {
-	case *dwarf.IntType:
+	case *godwarf.IntType:
 		if v.Value.Kind() != constant.Int {
 			return converr
 		}
-	case *dwarf.UintType:
+	case *godwarf.UintType:
 		if v.Value.Kind() != constant.Int {
 			return converr
 		}
-	case *dwarf.FloatType:
+	case *godwarf.FloatType:
 		if (v.Value.Kind() != constant.Int) && (v.Value.Kind() != constant.Float) {
 			return converr
 		}
-	case *dwarf.BoolType:
+	case *godwarf.BoolType:
 		if v.Value.Kind() != constant.Bool {
 			return converr
 		}
-	case *dwarf.StringType:
+	case *godwarf.StringType:
 		if v.Value.Kind() != constant.String {
 			return converr
 		}
-	case *dwarf.ComplexType:
+	case *godwarf.ComplexType:
 		if v.Value.Kind() != constant.Complex && v.Value.Kind() != constant.Float && v.Value.Kind() != constant.Int {
 			return converr
 		}
@@ -1045,7 +1259,11 @@ func (v *Variable) sliceAccess(idx int) (*Variable, error) {
 	if idx < 0 || int64(idx) >= v.Len {
 		return nil, fmt.Errorf("index out of bounds")
 	}
-	return v.newVariable("", v.Base+uintptr(int64(idx)*v.stride), v.fieldType), nil
+	mem := v.mem
+	if v.Kind != reflect.Array {
+		mem = DereferenceMemory(mem)
+	}
+	return v.newVariable("", v.Base+uintptr(int64(idx)*v.stride), v.fieldType, mem), nil
 }
 
 func (v *Variable) mapAccess(idx *Variable) (*Variable, error) {
@@ -1063,7 +1281,7 @@ func (v *Variable) mapAccess(idx *Variable) (*Variable, error) {
 		}
 		if first {
 			first = false
-			if err := idx.isType(key.DwarfType, key.Kind); err != nil {
+			if err := idx.isType(key.RealType, key.Kind); err != nil {
 				return nil, err
 			}
 		}
@@ -1095,22 +1313,16 @@ func (v *Variable) reslice(low int64, high int64) (*Variable, error) {
 	}
 
 	typ := v.DwarfType
-	if _, isarr := v.DwarfType.(*dwarf.ArrayType); isarr {
+	if _, isarr := v.DwarfType.(*godwarf.ArrayType); isarr {
-		typ = &dwarf.SliceType{
+		typ = fakeSliceType(v.fieldType)
-			StructType: dwarf.StructType{
-				CommonType: dwarf.CommonType{
-					ByteSize: 24,
-					Name:     "",
-				},
-				StructName: fmt.Sprintf("[]%s", v.fieldType.Common().Name),
-				Kind:       "struct",
-				Field:      nil,
-			},
-			ElemType: v.fieldType,
-		}
 	}
 
-	r := v.newVariable("", 0, typ)
+	mem := v.mem
+	if v.Kind != reflect.Array {
+		mem = DereferenceMemory(mem)
+	}
+
+	r := v.newVariable("", 0, typ, mem)
 	r.Cap = len
 	r.Len = len
 	r.Base = base
@@ -1119,3 +1331,147 @@ func (v *Variable) reslice(low int64, high int64) (*Variable, error) {
 
 	return r, nil
 }
+
+// findMethod finds method mname in the type of variable v
+func (v *Variable) findMethod(mname string) (*Variable, error) {
+	if _, isiface := v.RealType.(*godwarf.InterfaceType); isiface {
+		v.loadInterface(0, false, loadFullValue)
+		if v.Unreadable != nil {
+			return nil, v.Unreadable
+		}
+		return v.Children[0].findMethod(mname)
+	}
+
+	typ := v.DwarfType
+	ptyp, isptr := typ.(*godwarf.PtrType)
+	if isptr {
+		typ = ptyp.Type
+	}
+
+	if _, istypedef := typ.(*godwarf.TypedefType); !istypedef {
+		return nil, nil
+	}
+
+	typePath := typ.Common().Name
+	dot := strings.LastIndex(typePath, ".")
+	if dot < 0 {
+		// probably just a C type
+		return nil, nil
+	}
+
+	pkg := typePath[:dot]
+	receiver := typePath[dot+1:]
+
+	if fn, ok := v.bi.LookupFunc[fmt.Sprintf("%s.%s.%s", pkg, receiver, mname)]; ok {
+		r, err := functionToVariable(fn, v.bi, v.mem)
+		if err != nil {
+			return nil, err
+		}
+		if isptr {
+			r.Children = append(r.Children, *(v.maybeDereference()))
+		} else {
+			r.Children = append(r.Children, *v)
+		}
+		return r, nil
+	}
+
+	if fn, ok := v.bi.LookupFunc[fmt.Sprintf("%s.(*%s).%s", pkg, receiver, mname)]; ok {
+		r, err := functionToVariable(fn, v.bi, v.mem)
+		if err != nil {
+			return nil, err
+		}
+		if isptr {
+			r.Children = append(r.Children, *v)
+		} else {
+			r.Children = append(r.Children, *(v.pointerToVariable()))
+		}
+		return r, nil
+	}
+
+	return nil, nil
+}
+
+func functionToVariable(fn *Function, bi *BinaryInfo, mem MemoryReadWriter) (*Variable, error) {
+	typ, err := fn.fakeType(bi, true)
+	if err != nil {
+		return nil, err
+	}
+	v := newVariable(fn.Name, 0, typ, bi, mem)
+	v.Value = constant.MakeString(fn.Name)
+	v.loaded = true
+	v.Base = uintptr(fn.Entry)
+	return v, nil
+}
+
+func fakeSliceType(fieldType godwarf.Type) godwarf.Type {
+	return &godwarf.SliceType{
+		StructType: godwarf.StructType{
+			CommonType: godwarf.CommonType{
+				ByteSize: 24,
+				Name:     "",
+			},
+			StructName: fmt.Sprintf("[]%s", fieldType.Common().Name),
+			Kind:       "struct",
+			Field:      nil,
+		},
+		ElemType: fieldType,
+	}
+}
+
+var errMethodEvalUnsupported = errors.New("evaluating methods not supported on this version of Go")
+
+func (fn *Function) fakeType(bi *BinaryInfo, removeReceiver bool) (*godwarf.FuncType, error) {
+	if producer := bi.Producer(); producer == "" || !goversion.ProducerAfterOrEqual(producer, 1, 10) {
+		// versions of Go prior to 1.10 do not distinguish between parameters and
+		// return values, therefore we can't use a subprogram DIE to derive a
+		// function type.
+		return nil, errMethodEvalUnsupported
+	}
+	_, formalArgs, err := funcCallArgs(fn, bi, true)
+	if err != nil {
+		return nil, err
+	}
+
+	if removeReceiver {
+		formalArgs = formalArgs[1:]
+	}
+
+	args := make([]string, 0, len(formalArgs))
+	rets := make([]string, 0, len(formalArgs))
+
+	for _, formalArg := range formalArgs {
+		var s string
+		if strings.HasPrefix(formalArg.name, "~") {
+			s = formalArg.typ.String()
+		} else {
+			s = fmt.Sprintf("%s %s", formalArg.name, formalArg.typ.String())
+		}
+		if formalArg.isret {
+			rets = append(rets, s)
+		} else {
+			args = append(args, s)
+		}
+	}
+
+	argstr := strings.Join(args, ", ")
+	var retstr string
+	switch len(rets) {
+	case 0:
+		retstr = ""
+	case 1:
+		retstr = " " + rets[0]
+	default:
+		retstr = " (" + strings.Join(rets, ", ") + ")"
+	}
+	return &godwarf.FuncType{
+		CommonType: godwarf.CommonType{
+			Name:        "func(" + argstr + ")" + retstr,
+			ReflectKind: reflect.Func,
+		},
+		//TODO(aarzilli): at the moment we aren't using the ParamType and
+		// ReturnType fields of FuncType anywhere (when this is returned to the
+		// client it's first converted to a string and the function calling code
+		// reads the subroutine entry because it needs to know the stack offsets).
+		// If we start using them they should be filled here.
+	}, nil
+}

vendor/github.com/derekparker/delve/pkg/proc/fncall.go

@@ -0,0 +1,561 @@
+package proc
+
+import (
+	"debug/dwarf"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"go/ast"
+	"go/constant"
+	"go/parser"
+	"reflect"
+	"sort"
+
+	"github.com/derekparker/delve/pkg/dwarf/godwarf"
+	"github.com/derekparker/delve/pkg/dwarf/op"
+	"github.com/derekparker/delve/pkg/dwarf/reader"
+	"github.com/derekparker/delve/pkg/logflags"
+	"github.com/sirupsen/logrus"
+	"golang.org/x/arch/x86/x86asm"
+)
+
+// This file implements the function call injection introduced in go1.11.
+//
+// The protocol is described in $GOROOT/src/runtime/asm_amd64.s in the
+// comments for function runtime·debugCallV1.
+//
+// There are two main entry points here. The first one is CallFunction which
+// evaluates a function call expression, sets up the function call on the
+// selected goroutine and resumes execution of the process.
+//
+// The second one is (*FunctionCallState).step() which is called every time
+// the process stops at a breakpoint inside one of the debug injcetion
+// functions.
+
+const (
+	debugCallFunctionNamePrefix1 = "debugCall"
+	debugCallFunctionNamePrefix2 = "runtime.debugCall"
+	debugCallFunctionName        = "runtime.debugCallV1"
+)
+
+var (
+	errFuncCallUnsupported        = errors.New("function calls not supported by this version of Go")
+	errFuncCallUnsupportedBackend = errors.New("backend does not support function calls")
+	errFuncCallInProgress         = errors.New("cannot call function while another function call is already in progress")
+	errNotACallExpr               = errors.New("not a function call")
+	errNoGoroutine                = errors.New("no goroutine selected")
+	errGoroutineNotRunning        = errors.New("selected goroutine not running")
+	errNotEnoughStack             = errors.New("not enough stack space")
+	errTooManyArguments           = errors.New("too many arguments")
+	errNotEnoughArguments         = errors.New("not enough arguments")
+	errNoAddrUnsupported          = errors.New("arguments to a function call must have an address")
+	errNotAGoFunction             = errors.New("not a Go function")
+)
+
+type functionCallState struct {
+	// inProgress is true if a function call is in progress
+	inProgress bool
+	// finished is true if the function call terminated
+	finished bool
+	// savedRegs contains the saved registers
+	savedRegs Registers
+	// expr contains an expression describing the current function call
+	expr string
+	// err contains a saved error
+	err error
+	// fn is the function that is being called
+	fn *Function
+	// closureAddr is the address of the closure being called
+	closureAddr uint64
+	// argmem contains the argument frame of this function call
+	argmem []byte
+	// retvars contains the return variables after the function call terminates without panic'ing
+	retvars []*Variable
+	// retLoadCfg is the load configuration used to load return values
+	retLoadCfg *LoadConfig
+	// panicvar is a variable used to store the value of the panic, if the
+	// called function panics.
+	panicvar *Variable
+}
+
+// CallFunction starts a debugger injected function call on the current thread of p.
+// See runtime.debugCallV1 in $GOROOT/src/runtime/asm_amd64.s for a
+// description of the protocol.
+func CallFunction(p Process, expr string, retLoadCfg *LoadConfig) error {
+	bi := p.BinInfo()
+	if !p.Common().fncallEnabled {
+		return errFuncCallUnsupportedBackend
+	}
+	fncall := &p.Common().fncallState
+	if fncall.inProgress {
+		return errFuncCallInProgress
+	}
+
+	*fncall = functionCallState{}
+
+	dbgcallfn := bi.LookupFunc[debugCallFunctionName]
+	if dbgcallfn == nil {
+		return errFuncCallUnsupported
+	}
+
+	// check that the selected goroutine is running
+	g := p.SelectedGoroutine()
+	if g == nil {
+		return errNoGoroutine
+	}
+	if g.Status != Grunning || g.Thread == nil {
+		return errGoroutineNotRunning
+	}
+
+	// check that there are at least 256 bytes free on the stack
+	regs, err := g.Thread.Registers(true)
+	if err != nil {
+		return err
+	}
+	regs = regs.Copy()
+	if regs.SP()-256 <= g.stacklo {
+		return errNotEnoughStack
+	}
+	_, err = regs.Get(int(x86asm.RAX))
+	if err != nil {
+		return errFuncCallUnsupportedBackend
+	}
+
+	fn, closureAddr, argvars, err := funcCallEvalExpr(p, expr)
+	if err != nil {
+		return err
+	}
+
+	argmem, err := funcCallArgFrame(fn, argvars, g, bi)
+	if err != nil {
+		return err
+	}
+
+	if err := callOP(bi, g.Thread, regs, dbgcallfn.Entry); err != nil {
+		return err
+	}
+	// write the desired argument frame size at SP-(2*pointer_size) (the extra pointer is the saved PC)
+	if err := writePointer(bi, g.Thread, regs.SP()-3*uint64(bi.Arch.PtrSize()), uint64(len(argmem))); err != nil {
+		return err
+	}
+
+	fncall.inProgress = true
+	fncall.savedRegs = regs
+	fncall.expr = expr
+	fncall.fn = fn
+	fncall.closureAddr = closureAddr
+	fncall.argmem = argmem
+	fncall.retLoadCfg = retLoadCfg
+
+	fncallLog("function call initiated %v frame size %d\n", fn, len(argmem))
+
+	return Continue(p)
+}
+
+func fncallLog(fmtstr string, args ...interface{}) {
+	if !logflags.FnCall() {
+		return
+	}
+	logrus.WithFields(logrus.Fields{"layer": "proc", "kind": "fncall"}).Infof(fmtstr, args...)
+}
+
+// writePointer writes val as an architecture pointer at addr in mem.
+func writePointer(bi *BinaryInfo, mem MemoryReadWriter, addr, val uint64) error {
+	ptrbuf := make([]byte, bi.Arch.PtrSize())
+
+	// TODO: use target architecture endianness instead of LittleEndian
+	switch len(ptrbuf) {
+	case 4:
+		binary.LittleEndian.PutUint32(ptrbuf, uint32(val))
+	case 8:
+		binary.LittleEndian.PutUint64(ptrbuf, val)
+	default:
+		panic(fmt.Errorf("unsupported pointer size %d", len(ptrbuf)))
+	}
+	_, err := mem.WriteMemory(uintptr(addr), ptrbuf)
+	return err
+}
+
+// callOP simulates a call instruction on the given thread:
+// * pushes the current value of PC on the stack (adjusting SP)
+// * changes the value of PC to callAddr
+// Note: regs are NOT updated!
+func callOP(bi *BinaryInfo, thread Thread, regs Registers, callAddr uint64) error {
+	sp := regs.SP()
+	// push PC on the stack
+	sp -= uint64(bi.Arch.PtrSize())
+	if err := thread.SetSP(sp); err != nil {
+		return err
+	}
+	if err := writePointer(bi, thread, sp, regs.PC()); err != nil {
+		return err
+	}
+	return thread.SetPC(callAddr)
+}
+
+// funcCallEvalExpr evaluates expr, which must be a function call, returns
+// the function being called and its arguments.
+func funcCallEvalExpr(p Process, expr string) (fn *Function, closureAddr uint64, argvars []*Variable, err error) {
+	bi := p.BinInfo()
+	scope, err := GoroutineScope(p.CurrentThread())
+	if err != nil {
+		return nil, 0, nil, err
+	}
+
+	t, err := parser.ParseExpr(expr)
+	if err != nil {
+		return nil, 0, nil, err
+	}
+	callexpr, iscall := t.(*ast.CallExpr)
+	if !iscall {
+		return nil, 0, nil, errNotACallExpr
+	}
+
+	fnvar, err := scope.evalAST(callexpr.Fun)
+	if err != nil {
+		return nil, 0, nil, err
+	}
+	if fnvar.Kind != reflect.Func {
+		return nil, 0, nil, fmt.Errorf("expression %q is not a function", exprToString(callexpr.Fun))
+	}
+	fnvar.loadValue(LoadConfig{false, 0, 0, 0, 0})
+	if fnvar.Unreadable != nil {
+		return nil, 0, nil, fnvar.Unreadable
+	}
+	if fnvar.Base == 0 {
+		return nil, 0, nil, errors.New("nil pointer dereference")
+	}
+	fn = bi.PCToFunc(uint64(fnvar.Base))
+	if fn == nil {
+		return nil, 0, nil, fmt.Errorf("could not find DIE for function %q", exprToString(callexpr.Fun))
+	}
+	if !fn.cu.isgo {
+		return nil, 0, nil, errNotAGoFunction
+	}
+
+	argvars = make([]*Variable, 0, len(callexpr.Args)+1)
+	if len(fnvar.Children) > 0 {
+		// receiver argument
+		argvars = append(argvars, &fnvar.Children[0])
+	}
+	for i := range callexpr.Args {
+		argvar, err := scope.evalAST(callexpr.Args[i])
+		if err != nil {
+			return nil, 0, nil, err
+		}
+		argvar.Name = exprToString(callexpr.Args[i])
+		argvars = append(argvars, argvar)
+	}
+
+	return fn, fnvar.funcvalAddr(), argvars, nil
+}
+
+type funcCallArg struct {
+	name  string
+	typ   godwarf.Type
+	off   int64
+	isret bool
+}
+
+// funcCallArgFrame checks type and pointer escaping for the arguments and
+// returns the argument frame.
+func funcCallArgFrame(fn *Function, actualArgs []*Variable, g *G, bi *BinaryInfo) (argmem []byte, err error) {
+	argFrameSize, formalArgs, err := funcCallArgs(fn, bi, false)
+	if err != nil {
+		return nil, err
+	}
+	if len(actualArgs) > len(formalArgs) {
+		return nil, errTooManyArguments
+	}
+	if len(actualArgs) < len(formalArgs) {
+		return nil, errNotEnoughArguments
+	}
+
+	// constructs arguments frame
+	argmem = make([]byte, argFrameSize)
+	argmemWriter := &bufferMemoryReadWriter{argmem}
+	for i := range formalArgs {
+		formalArg := &formalArgs[i]
+		actualArg := actualArgs[i]
+
+		//TODO(aarzilli): only apply the escapeCheck to leaking parameters.
+		if err := escapeCheck(actualArg, formalArg.name, g); err != nil {
+			return nil, fmt.Errorf("can not pass %s to %s: %v", actualArg.Name, formalArg.name, err)
+		}
+
+		//TODO(aarzilli): autmoatic wrapping in interfaces for cases not handled
+		// by convertToEface.
+
+		formalArgVar := newVariable(formalArg.name, uintptr(formalArg.off+fakeAddress), formalArg.typ, bi, argmemWriter)
+		if err := formalArgVar.setValue(actualArg, actualArg.Name); err != nil {
+			return nil, err
+		}
+	}
+
+	return argmem, nil
+}
+
+func funcCallArgs(fn *Function, bi *BinaryInfo, includeRet bool) (argFrameSize int64, formalArgs []funcCallArg, err error) {
+	const CFA = 0x1000
+	vrdr := reader.Variables(bi.dwarf, fn.offset, reader.ToRelAddr(fn.Entry, bi.staticBase), int(^uint(0)>>1), false)
+
+	// typechecks arguments, calculates argument frame size
+	for vrdr.Next() {
+		e := vrdr.Entry()
+		if e.Tag != dwarf.TagFormalParameter {
+			continue
+		}
+		entry, argname, typ, err := readVarEntry(e, bi)
+		if err != nil {
+			return 0, nil, err
+		}
+		typ = resolveTypedef(typ)
+		locprog, _, err := bi.locationExpr(entry, dwarf.AttrLocation, fn.Entry)
+		if err != nil {
+			return 0, nil, fmt.Errorf("could not get argument location of %s: %v", argname, err)
+		}
+		off, _, err := op.ExecuteStackProgram(op.DwarfRegisters{CFA: CFA, FrameBase: CFA}, locprog)
+		if err != nil {
+			return 0, nil, fmt.Errorf("unsupported location expression for argument %s: %v", argname, err)
+		}
+
+		off -= CFA
+
+		if e := off + typ.Size(); e > argFrameSize {
+			argFrameSize = e
+		}
+
+		if isret, _ := entry.Val(dwarf.AttrVarParam).(bool); !isret || includeRet {
+			formalArgs = append(formalArgs, funcCallArg{name: argname, typ: typ, off: off, isret: isret})
+		}
+	}
+	if err := vrdr.Err(); err != nil {
+		return 0, nil, fmt.Errorf("DWARF read error: %v", err)
+	}
+
+	sort.Slice(formalArgs, func(i, j int) bool {
+		return formalArgs[i].off < formalArgs[j].off
+	})
+
+	return argFrameSize, formalArgs, nil
+}
+
+func escapeCheck(v *Variable, name string, g *G) error {
+	switch v.Kind {
+	case reflect.Ptr:
+		w := v.maybeDereference()
+		return escapeCheckPointer(w.Addr, name, g)
+	case reflect.Chan, reflect.String, reflect.Slice:
+		return escapeCheckPointer(v.Base, name, g)
+	case reflect.Map:
+		sv := v.clone()
+		sv.RealType = resolveTypedef(&(v.RealType.(*godwarf.MapType).TypedefType))
+		sv = sv.maybeDereference()
+		return escapeCheckPointer(sv.Addr, name, g)
+	case reflect.Struct:
+		t := v.RealType.(*godwarf.StructType)
+		for _, field := range t.Field {
+			fv, _ := v.toField(field)
+			if err := escapeCheck(fv, fmt.Sprintf("%s.%s", name, field.Name), g); err != nil {
+				return err
+			}
+		}
+	case reflect.Array:
+		for i := int64(0); i < v.Len; i++ {
+			sv, _ := v.sliceAccess(int(i))
+			if err := escapeCheck(sv, fmt.Sprintf("%s[%d]", name, i), g); err != nil {
+				return err
+			}
+		}
+	case reflect.Func:
+		if err := escapeCheckPointer(uintptr(v.funcvalAddr()), name, g); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func escapeCheckPointer(addr uintptr, name string, g *G) error {
+	if uint64(addr) >= g.stacklo && uint64(addr) < g.stackhi {
+		return fmt.Errorf("stack object passed to escaping pointer: %s", name)
+	}
+	return nil
+}
+
+const (
+	debugCallAXPrecheckFailed   = 8
+	debugCallAXCompleteCall     = 0
+	debugCallAXReadReturn       = 1
+	debugCallAXReadPanic        = 2
+	debugCallAXRestoreRegisters = 16
+)
+
+func (fncall *functionCallState) step(p Process) {
+	bi := p.BinInfo()
+
+	thread := p.CurrentThread()
+	regs, err := thread.Registers(false)
+	if err != nil {
+		fncall.err = err
+		fncall.finished = true
+		fncall.inProgress = false
+		return
+	}
+	regs = regs.Copy()
+
+	rax, _ := regs.Get(int(x86asm.RAX))
+
+	if logflags.FnCall() {
+		loc, _ := thread.Location()
+		var pc uint64
+		var fnname string
+		if loc != nil {
+			pc = loc.PC
+			if loc.Fn != nil {
+				fnname = loc.Fn.Name
+			}
+		}
+		fncallLog("function call interrupt rax=%#x (PC=%#x in %s)\n", rax, pc, fnname)
+	}
+
+	switch rax {
+	case debugCallAXPrecheckFailed:
+		// get error from top of the stack and return it to user
+		errvar, err := readTopstackVariable(thread, regs, "string", loadFullValue)
+		if err != nil {
+			fncall.err = fmt.Errorf("could not get precheck error reason: %v", err)
+			break
+		}
+		errvar.Name = "err"
+		fncall.err = fmt.Errorf("%v", constant.StringVal(errvar.Value))
+
+	case debugCallAXCompleteCall:
+		// write arguments to the stack, call final function
+		n, err := thread.WriteMemory(uintptr(regs.SP()), fncall.argmem)
+		if err != nil {
+			fncall.err = fmt.Errorf("could not write arguments: %v", err)
+		}
+		if n != len(fncall.argmem) {
+			fncall.err = fmt.Errorf("short argument write: %d %d", n, len(fncall.argmem))
+		}
+		if fncall.closureAddr != 0 {
+			// When calling a function pointer we must set the DX register to the
+			// address of the function pointer itself.
+			thread.SetDX(fncall.closureAddr)
+		}
+		callOP(bi, thread, regs, fncall.fn.Entry)
+
+	case debugCallAXRestoreRegisters:
+		// runtime requests that we restore the registers (all except pc and sp),
+		// this is also the last step of the function call protocol.
+		fncall.finished = true
+		pc, sp := regs.PC(), regs.SP()
+		if err := thread.RestoreRegisters(fncall.savedRegs); err != nil {
+			fncall.err = fmt.Errorf("could not restore registers: %v", err)
+		}
+		if err := thread.SetPC(pc); err != nil {
+			fncall.err = fmt.Errorf("could not restore PC: %v", err)
+		}
+		if err := thread.SetSP(sp); err != nil {
+			fncall.err = fmt.Errorf("could not restore SP: %v", err)
+		}
+		if err := stepInstructionOut(p, thread, debugCallFunctionName, debugCallFunctionName); err != nil {
+			fncall.err = fmt.Errorf("could not step out of %s: %v", debugCallFunctionName, err)
+		}
+
+	case debugCallAXReadReturn:
+		// read return arguments from stack
+		if fncall.retLoadCfg == nil || fncall.panicvar != nil {
+			break
+		}
+		scope, err := ThreadScope(thread)
+		if err != nil {
+			fncall.err = fmt.Errorf("could not get return values: %v", err)
+			break
+		}
+
+		// pretend we are still inside the function we called
+		fakeFunctionEntryScope(scope, fncall.fn, int64(regs.SP()), regs.SP()-uint64(bi.Arch.PtrSize()))
+
+		fncall.retvars, err = scope.Locals()
+		if err != nil {
+			fncall.err = fmt.Errorf("could not get return values: %v", err)
+			break
+		}
+		fncall.retvars = filterVariables(fncall.retvars, func(v *Variable) bool {
+			return (v.Flags & VariableReturnArgument) != 0
+		})
+
+		loadValues(fncall.retvars, *fncall.retLoadCfg)
+
+	case debugCallAXReadPanic:
+		// read panic value from stack
+		if fncall.retLoadCfg == nil {
+			return
+		}
+		fncall.panicvar, err = readTopstackVariable(thread, regs, "interface {}", *fncall.retLoadCfg)
+		if err != nil {
+			fncall.err = fmt.Errorf("could not get panic: %v", err)
+			break
+		}
+		fncall.panicvar.Name = "~panic"
+		fncall.panicvar.loadValue(*fncall.retLoadCfg)
+		if fncall.panicvar.Unreadable != nil {
+			fncall.err = fmt.Errorf("could not get panic: %v", fncall.panicvar.Unreadable)
+			break
+		}
+
+	default:
+		// Got an unknown AX value, this is probably bad but the safest thing
+		// possible is to ignore it and hope it didn't matter.
+		fncallLog("unknown value of AX %#x", rax)
+	}
+}
+
+func readTopstackVariable(thread Thread, regs Registers, typename string, loadCfg LoadConfig) (*Variable, error) {
+	bi := thread.BinInfo()
+	scope, err := ThreadScope(thread)
+	if err != nil {
+		return nil, err
+	}
+	typ, err := bi.findType(typename)
+	if err != nil {
+		return nil, err
+	}
+	v := scope.newVariable("", uintptr(regs.SP()), typ, scope.Mem)
+	v.loadValue(loadCfg)
+	if v.Unreadable != nil {
+		return nil, v.Unreadable
+	}
+	return v, nil
+}
+
+// fakeEntryScope alters scope to pretend that we are at the entry point of
+// fn and CFA and SP are the ones passed as argument.
+// This function is used to create a scope for a call frame that doesn't
+// exist anymore, to read the return variables of an injected function call,
+// or after a stepout command.
+func fakeFunctionEntryScope(scope *EvalScope, fn *Function, cfa int64, sp uint64) error {
+	scope.PC = fn.Entry
+	scope.Fn = fn
+	scope.File, scope.Line, _ = scope.BinInfo.PCToLine(fn.Entry)
+
+	scope.Regs.CFA = cfa
+	scope.Regs.Regs[scope.Regs.SPRegNum].Uint64Val = sp
+
+	scope.BinInfo.dwarfReader.Seek(fn.offset)
+	e, err := scope.BinInfo.dwarfReader.Next()
+	if err != nil {
+		return err
+	}
+	scope.Regs.FrameBase, _, _, _ = scope.BinInfo.Location(e, dwarf.AttrFrameBase, scope.PC, scope.Regs)
+	return nil
+}
+
+func (fncall *functionCallState) returnValues() []*Variable {
+	if fncall.panicvar != nil {
+		return []*Variable{fncall.panicvar}
+	}
+	return fncall.retvars
+}

vendor/github.com/derekparker/delve/pkg/proc/gdbserial/gdbserver_unix.go

@@ -0,0 +1,16 @@
+// +build linux darwin
+
+package gdbserial
+
+import (
+	"os/signal"
+	"syscall"
+)
+
+func sysProcAttr(foreground bool) *syscall.SysProcAttr {
+	return &syscall.SysProcAttr{Setpgid: true, Pgid: 0, Foreground: foreground}
+}
+
+func foregroundSignalsIgnore() {
+	signal.Ignore(syscall.SIGTTOU, syscall.SIGTTIN)
+}

vendor/github.com/derekparker/delve/pkg/proc/gdbserial/gdbserver_windows.go

@@ -0,0 +1,10 @@
+package gdbserial
+
+import "syscall"
+
+func sysProcAttr(foreground bool) *syscall.SysProcAttr {
+	return nil
+}
+
+func foregroundSignalsIgnore() {
+}

vendor/github.com/derekparker/delve/pkg/proc/gdbserial/rr.go

@@ -0,0 +1,267 @@
+package gdbserial
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"strconv"
+	"strings"
+	"unicode"
+)
+
+// Record uses rr to record the execution of the specified program and
+// returns the trace directory's path.
+func Record(cmd []string, wd string, quiet bool) (tracedir string, err error) {
+	if err := checkRRAvailabe(); err != nil {
+		return "", err
+	}
+
+	rfd, wfd, err := os.Pipe()
+	if err != nil {
+		return "", err
+	}
+
+	args := make([]string, 0, len(cmd)+2)
+	args = append(args, "record", "--print-trace-dir=3")
+	args = append(args, cmd...)
+	rrcmd := exec.Command("rr", args...)
+	rrcmd.Stdin = os.Stdin
+	if !quiet {
+		rrcmd.Stdout = os.Stdout
+		rrcmd.Stderr = os.Stderr
+	}
+	rrcmd.ExtraFiles = []*os.File{wfd}
+	rrcmd.Dir = wd
+
+	done := make(chan struct{})
+	go func() {
+		bs, _ := ioutil.ReadAll(rfd)
+		tracedir = strings.TrimSpace(string(bs))
+		close(done)
+	}()
+
+	err = rrcmd.Run()
+	// ignore run errors, it could be the program crashing
+	wfd.Close()
+	<-done
+	return
+}
+
+// Replay starts an instance of rr in replay mode, with the specified trace
+// directory, and connects to it.
+func Replay(tracedir string, quiet bool) (*Process, error) {
+	if err := checkRRAvailabe(); err != nil {
+		return nil, err
+	}
+
+	rrcmd := exec.Command("rr", "replay", "--dbgport=0", tracedir)
+	rrcmd.Stdout = os.Stdout
+	stderr, err := rrcmd.StderrPipe()
+	if err != nil {
+		return nil, err
+	}
+	rrcmd.SysProcAttr = sysProcAttr(false)
+
+	initch := make(chan rrInit)
+	go rrStderrParser(stderr, initch, quiet)
+
+	err = rrcmd.Start()
+	if err != nil {
+		return nil, err
+	}
+
+	init := <-initch
+	if init.err != nil {
+		rrcmd.Process.Kill()
+		return nil, init.err
+	}
+
+	p := New(rrcmd.Process)
+	p.tracedir = tracedir
+	err = p.Dial(init.port, init.exe, 0)
+	if err != nil {
+		rrcmd.Process.Kill()
+		return nil, err
+	}
+
+	return p, nil
+}
+
+// ErrPerfEventParanoid is the error returned by Reply and Record if
+// /proc/sys/kernel/perf_event_paranoid is greater than 1.
+type ErrPerfEventParanoid struct {
+	actual int
+}
+
+func (err ErrPerfEventParanoid) Error() string {
+	return fmt.Sprintf("rr needs /proc/sys/kernel/perf_event_paranoid <= 1, but it is %d", err.actual)
+}
+
+func checkRRAvailabe() error {
+	if _, err := exec.LookPath("rr"); err != nil {
+		return &ErrBackendUnavailable{}
+	}
+
+	// Check that /proc/sys/kernel/perf_event_paranoid doesn't exist or is <= 1.
+	buf, err := ioutil.ReadFile("/proc/sys/kernel/perf_event_paranoid")
+	if err == nil {
+		perfEventParanoid, _ := strconv.Atoi(strings.TrimSpace(string(buf)))
+		if perfEventParanoid > 1 {
+			return ErrPerfEventParanoid{perfEventParanoid}
+		}
+	}
+
+	return nil
+}
+
+type rrInit struct {
+	port string
+	exe  string
+	err  error
+}
+
+const (
+	rrGdbCommandPrefix = "  gdb "
+	rrGdbLaunchPrefix  = "Launch gdb with"
+	targetCmd          = "target extended-remote "
+)
+
+func rrStderrParser(stderr io.Reader, initch chan<- rrInit, quiet bool) {
+	rd := bufio.NewReader(stderr)
+	for {
+		line, err := rd.ReadString('\n')
+		if err != nil {
+			initch <- rrInit{"", "", err}
+			close(initch)
+			return
+		}
+
+		if strings.HasPrefix(line, rrGdbCommandPrefix) {
+			initch <- rrParseGdbCommand(line[len(rrGdbCommandPrefix):])
+			close(initch)
+			break
+		}
+
+		if strings.HasPrefix(line, rrGdbLaunchPrefix) {
+			continue
+		}
+
+		if !quiet {
+			os.Stderr.Write([]byte(line))
+		}
+	}
+
+	io.Copy(os.Stderr, rd)
+}
+
+type ErrMalformedRRGdbCommand struct {
+	line, reason string
+}
+
+func (err *ErrMalformedRRGdbCommand) Error() string {
+	return fmt.Sprintf("malformed gdb command %q: %s", err.line, err.reason)
+}
+
+func rrParseGdbCommand(line string) rrInit {
+	port := ""
+	fields := splitQuotedFields(line)
+	for i := 0; i < len(fields); i++ {
+		switch fields[i] {
+		case "-ex":
+			if i+1 >= len(fields) {
+				return rrInit{err: &ErrMalformedRRGdbCommand{line, "-ex not followed by an argument"}}
+			}
+			arg := fields[i+1]
+
+			if !strings.HasPrefix(arg, targetCmd) {
+				continue
+			}
+
+			port = arg[len(targetCmd):]
+			i++
+
+		case "-l":
+			// skip argument
+			i++
+		}
+	}
+
+	if port == "" {
+		return rrInit{err: &ErrMalformedRRGdbCommand{line, "could not find -ex argument"}}
+	}
+
+	exe := fields[len(fields)-1]
+
+	return rrInit{port: port, exe: exe}
+}
+
+// Like strings.Fields but ignores spaces inside areas surrounded
+// by single quotes.
+// To specify a single quote use backslash to escape it: '\''
+func splitQuotedFields(in string) []string {
+	type stateEnum int
+	const (
+		inSpace stateEnum = iota
+		inField
+		inQuote
+		inQuoteEscaped
+	)
+	state := inSpace
+	r := []string{}
+	var buf bytes.Buffer
+
+	for _, ch := range in {
+		switch state {
+		case inSpace:
+			if ch == '\'' {
+				state = inQuote
+			} else if !unicode.IsSpace(ch) {
+				buf.WriteRune(ch)
+				state = inField
+			}
+
+		case inField:
+			if ch == '\'' {
+				state = inQuote
+			} else if unicode.IsSpace(ch) {
+				r = append(r, buf.String())
+				buf.Reset()
+			} else {
+				buf.WriteRune(ch)
+			}
+
+		case inQuote:
+			if ch == '\'' {
+				state = inField
+			} else if ch == '\\' {
+				state = inQuoteEscaped
+			} else {
+				buf.WriteRune(ch)
+			}
+
+		case inQuoteEscaped:
+			buf.WriteRune(ch)
+			state = inQuote
+		}
+	}
+
+	if buf.Len() != 0 {
+		r = append(r, buf.String())
+	}
+
+	return r
+}
+
+// RecordAndReplay acts like calling Record and then Replay.
+func RecordAndReplay(cmd []string, wd string, quiet bool) (p *Process, tracedir string, err error) {
+	tracedir, err = Record(cmd, wd, quiet)
+	if tracedir == "" {
+		return nil, "", err
+	}
+	p, err = Replay(tracedir, quiet)
+	return p, tracedir, err
+}

vendor/github.com/derekparker/delve/pkg/proc/interface.go

@@ -0,0 +1,129 @@
+package proc
+
+import (
+	"go/ast"
+)
+
+// Process represents the target of the debugger. This
+// target could be a system process, core file, etc.
+//
+// Implementations of Process are not required to be thread safe and users
+// of Process should not assume they are.
+// There is one exception to this rule: it is safe to call RequestManualStop
+// concurrently with ContinueOnce.
+type Process interface {
+	Info
+	ProcessManipulation
+	BreakpointManipulation
+	RecordingManipulation
+}
+
+// RecordingManipulation is an interface for manipulating process recordings.
+type RecordingManipulation interface {
+	// Recorded returns true if the current process is a recording and the path
+	// to the trace directory.
+	Recorded() (recorded bool, tracedir string)
+	// Restart restarts the recording from the specified position, or from the
+	// last checkpoint if pos == "".
+	// If pos starts with 'c' it's a checkpoint ID, otherwise it's an event
+	// number.
+	Restart(pos string) error
+	// Direction changes execution direction.
+	Direction(Direction) error
+	// When returns current recording position.
+	When() (string, error)
+	// Checkpoint sets a checkpoint at the current position.
+	Checkpoint(where string) (id int, err error)
+	// Checkpoints returns the list of currently set checkpoint.
+	Checkpoints() ([]Checkpoint, error)
+	// ClearCheckpoint removes a checkpoint.
+	ClearCheckpoint(id int) error
+}
+
+// Direction is the direction of execution for the target process.
+type Direction int8
+
+const (
+	// Forward direction executes the target normally.
+	Forward Direction = 0
+	// Backward direction executes the target in reverse.
+	Backward Direction = 1
+)
+
+// Checkpoint is a checkpoint
+type Checkpoint struct {
+	ID    int
+	When  string
+	Where string
+}
+
+// Info is an interface that provides general information on the target.
+type Info interface {
+	Pid() int
+	// ResumeNotify specifies a channel that will be closed the next time
+	// ContinueOnce finishes resuming the target.
+	ResumeNotify(chan<- struct{})
+	// Valid returns true if this Process can be used. When it returns false it
+	// also returns an error describing why the Process is invalid (either
+	// ErrProcessExited or ProcessDetachedError).
+	Valid() (bool, error)
+	BinInfo() *BinaryInfo
+	// Common returns a struct with fields common to all backends
+	Common() *CommonProcess
+
+	ThreadInfo
+	GoroutineInfo
+}
+
+// ThreadInfo is an interface for getting information on active threads
+// in the process.
+type ThreadInfo interface {
+	FindThread(threadID int) (Thread, bool)
+	ThreadList() []Thread
+	CurrentThread() Thread
+}
+
+// GoroutineInfo is an interface for getting information on running goroutines.
+type GoroutineInfo interface {
+	SelectedGoroutine() *G
+}
+
+// ProcessManipulation is an interface for changing the execution state of a process.
+type ProcessManipulation interface {
+	ContinueOnce() (trapthread Thread, err error)
+	StepInstruction() error
+	SwitchThread(int) error
+	SwitchGoroutine(int) error
+	RequestManualStop() error
+	// CheckAndClearManualStopRequest returns true the first time it's called
+	// after a call to RequestManualStop.
+	CheckAndClearManualStopRequest() bool
+	Detach(bool) error
+}
+
+// BreakpointManipulation is an interface for managing breakpoints.
+type BreakpointManipulation interface {
+	Breakpoints() *BreakpointMap
+	SetBreakpoint(addr uint64, kind BreakpointKind, cond ast.Expr) (*Breakpoint, error)
+	ClearBreakpoint(addr uint64) (*Breakpoint, error)
+	ClearInternalBreakpoints() error
+}
+
+// CommonProcess contains fields used by this package, common to all
+// implementations of the Process interface.
+type CommonProcess struct {
+	allGCache     []*G
+	fncallState   functionCallState
+	fncallEnabled bool
+}
+
+// NewCommonProcess returns a struct with fields common across
+// all process implementations.
+func NewCommonProcess(fncallEnabled bool) CommonProcess {
+	return CommonProcess{fncallEnabled: fncallEnabled}
+}
+
+// ClearAllGCache clears the cached contents of the cache for runtime.allgs.
+func (p *CommonProcess) ClearAllGCache() {
+	p.allGCache = nil
+}

vendor/github.com/derekparker/delve/pkg/proc/linutil/auxv.go

@@ -0,0 +1,39 @@
+package linutil
+
+import (
+	"bytes"
+	"encoding/binary"
+)
+
+const (
+	_AT_NULL_AMD64  = 0
+	_AT_ENTRY_AMD64 = 9
+)
+
+// EntryPointFromAuxv searches the elf auxiliary vector for the entry point
+// address.
+// For a description of the auxiliary vector (auxv) format see:
+// System V Application Binary Interface, AMD64 Architecture Processor
+// Supplement, section 3.4.3
+func EntryPointFromAuxvAMD64(auxv []byte) uint64 {
+	rd := bytes.NewBuffer(auxv)
+
+	for {
+		var tag, val uint64
+		err := binary.Read(rd, binary.LittleEndian, &tag)
+		if err != nil {
+			return 0
+		}
+		err = binary.Read(rd, binary.LittleEndian, &val)
+		if err != nil {
+			return 0
+		}
+
+		switch tag {
+		case _AT_NULL_AMD64:
+			return 0
+		case _AT_ENTRY_AMD64:
+			return val
+		}
+	}
+}

vendor/github.com/derekparker/delve/pkg/proc/linutil/doc.go

@@ -0,0 +1,4 @@
+// This package contains functions and data structures used by both the
+// linux implementation of the native backend and the core backend to deal
+// with structures used by the linux kernel.
+package linutil

vendor/github.com/derekparker/delve/pkg/proc/mem.go

@@ -0,0 +1,156 @@
+package proc
+
+import (
+	"errors"
+
+	"github.com/derekparker/delve/pkg/dwarf/op"
+)
+
+const cacheEnabled = true
+
+// MemoryReader is like io.ReaderAt, but the offset is a uintptr so that it
+// can address all of 64-bit memory.
+// Redundant with memoryReadWriter but more easily suited to working with
+// the standard io package.
+type MemoryReader interface {
+	// ReadMemory is just like io.ReaderAt.ReadAt.
+	ReadMemory(buf []byte, addr uintptr) (n int, err error)
+}
+
+// MemoryReadWriter is an interface for reading or writing to
+// the targets memory. This allows us to read from the actual
+// target memory or possibly a cache.
+type MemoryReadWriter interface {
+	MemoryReader
+	WriteMemory(addr uintptr, data []byte) (written int, err error)
+}
+
+type memCache struct {
+	loaded    bool
+	cacheAddr uintptr
+	cache     []byte
+	mem       MemoryReadWriter
+}
+
+func (m *memCache) contains(addr uintptr, size int) bool {
+	return addr >= m.cacheAddr && addr <= (m.cacheAddr+uintptr(len(m.cache)-size))
+}
+
+func (m *memCache) ReadMemory(data []byte, addr uintptr) (n int, err error) {
+	if m.contains(addr, len(data)) {
+		if !m.loaded {
+			_, err := m.mem.ReadMemory(m.cache, m.cacheAddr)
+			if err != nil {
+				return 0, err
+			}
+			m.loaded = true
+		}
+		copy(data, m.cache[addr-m.cacheAddr:])
+		return len(data), nil
+	}
+
+	return m.mem.ReadMemory(data, addr)
+}
+
+func (m *memCache) WriteMemory(addr uintptr, data []byte) (written int, err error) {
+	return m.mem.WriteMemory(addr, data)
+}
+
+func cacheMemory(mem MemoryReadWriter, addr uintptr, size int) MemoryReadWriter {
+	if !cacheEnabled {
+		return mem
+	}
+	if size <= 0 {
+		return mem
+	}
+	switch cacheMem := mem.(type) {
+	case *memCache:
+		if cacheMem.contains(addr, size) {
+			return mem
+		}
+	case *compositeMemory:
+		return mem
+	}
+	return &memCache{false, addr, make([]byte, size), mem}
+}
+
+// fakeAddress used by extractVarInfoFromEntry for variables that do not
+// have a memory address, we can't use 0 because a lot of code (likely
+// including client code) assumes that addr == 0 is nil
+const fakeAddress = 0xbeef0000
+
+// compositeMemory represents a chunk of memory that is stored in CPU
+// registers or non-contiguously.
+//
+// When optimizations are enabled the compiler will store some variables
+// into registers and sometimes it will also store structs non-contiguously
+// with some fields stored into CPU registers and other fields stored in
+// memory.
+type compositeMemory struct {
+	realmem MemoryReadWriter
+	regs    op.DwarfRegisters
+	pieces  []op.Piece
+	data    []byte
+}
+
+func newCompositeMemory(mem MemoryReadWriter, regs op.DwarfRegisters, pieces []op.Piece) *compositeMemory {
+	cmem := &compositeMemory{realmem: mem, regs: regs, pieces: pieces, data: []byte{}}
+	for _, piece := range pieces {
+		if piece.IsRegister {
+			reg := regs.Bytes(piece.RegNum)
+			sz := piece.Size
+			if sz == 0 && len(pieces) == 1 {
+				sz = len(reg)
+			}
+			cmem.data = append(cmem.data, reg[:sz]...)
+		} else {
+			buf := make([]byte, piece.Size)
+			mem.ReadMemory(buf, uintptr(piece.Addr))
+			cmem.data = append(cmem.data, buf...)
+		}
+	}
+	return cmem
+}
+
+func (mem *compositeMemory) ReadMemory(data []byte, addr uintptr) (int, error) {
+	addr -= fakeAddress
+	if addr >= uintptr(len(mem.data)) || addr+uintptr(len(data)) > uintptr(len(mem.data)) {
+		return 0, errors.New("read out of bounds")
+	}
+	copy(data, mem.data[addr:addr+uintptr(len(data))])
+	return len(data), nil
+}
+
+func (mem *compositeMemory) WriteMemory(addr uintptr, data []byte) (int, error) {
+	//TODO(aarzilli): implement
+	return 0, errors.New("can't write composite memory")
+}
+
+// DereferenceMemory returns a MemoryReadWriter that can read and write the
+// memory pointed to by pointers in this memory.
+// Normally mem and mem.Dereference are the same object, they are different
+// only if this MemoryReadWriter is used to access memory outside of the
+// normal address space of the inferior process (such as data contained in
+// registers, or composite memory).
+func DereferenceMemory(mem MemoryReadWriter) MemoryReadWriter {
+	switch mem := mem.(type) {
+	case *compositeMemory:
+		return mem.realmem
+	}
+	return mem
+}
+
+// bufferMemoryReadWriter is dummy a MemoryReadWriter backed by a []byte.
+type bufferMemoryReadWriter struct {
+	buf []byte
+}
+
+func (mem *bufferMemoryReadWriter) ReadMemory(buf []byte, addr uintptr) (n int, err error) {
+	copy(buf, mem.buf[addr-fakeAddress:][:len(buf)])
+	return len(buf), nil
+}
+
+func (mem *bufferMemoryReadWriter) WriteMemory(addr uintptr, data []byte) (written int, err error) {
+	copy(mem.buf[addr-fakeAddress:], data)
+	return len(data), nil
+}

vendor/github.com/derekparker/delve/pkg/proc/moduledata.go

@@ -11,11 +11,11 @@ type moduleData struct {
 	typemapVar    *Variable
 }
 
-func (dbp *Process) loadModuleData() (err error) {
+func loadModuleData(bi *BinaryInfo, mem MemoryReadWriter) (err error) {
-	dbp.loadModuleDataOnce.Do(func() {
+	bi.loadModuleDataOnce.Do(func() {
-		scope := &EvalScope{Thread: dbp.CurrentThread, PC: 0, CFA: 0}
+		scope := globalScope(bi, mem)
 		var md *Variable
-		md, err = scope.packageVarAddr("runtime.firstmoduledata")
+		md, err = scope.findGlobal("runtime.firstmoduledata")
 		if err != nil {
 			return
 		}
@@ -43,7 +43,7 @@ func (dbp *Process) loadModuleData() (err error) {
 				return
 			}
 
-			dbp.moduleData = append(dbp.moduleData, moduleData{uintptr(types), uintptr(etypes), typemapVar})
+			bi.moduleData = append(bi.moduleData, moduleData{uintptr(types), uintptr(etypes), typemapVar})
 
 			md = nextVar.maybeDereference()
 			if md.Unreadable != nil {
@@ -56,56 +56,65 @@ func (dbp *Process) loadModuleData() (err error) {
 	return
 }
 
-func (dbp *Process) resolveTypeOff(typeAddr uintptr, off uintptr) (*Variable, error) {
+func findModuleDataForType(bi *BinaryInfo, typeAddr uintptr, mem MemoryReadWriter) (*moduleData, error) {
-	// See runtime.(*_type).typeOff in $GOROOT/src/runtime/type.go
+	if err := loadModuleData(bi, mem); err != nil {
-	if err := dbp.loadModuleData(); err != nil {
 		return nil, err
 	}
 
 	var md *moduleData
-	for i := range dbp.moduleData {
+	for i := range bi.moduleData {
-		if typeAddr >= dbp.moduleData[i].types && typeAddr < dbp.moduleData[i].etypes {
+		if typeAddr >= bi.moduleData[i].types && typeAddr < bi.moduleData[i].etypes {
-			md = &dbp.moduleData[i]
+			md = &bi.moduleData[i]
 		}
 	}
 
-	rtyp, err := dbp.findType("runtime._type")
+	return md, nil
+}
+
+func resolveTypeOff(bi *BinaryInfo, typeAddr uintptr, off uintptr, mem MemoryReadWriter) (*Variable, error) {
+	// See runtime.(*_type).typeOff in $GOROOT/src/runtime/type.go
+	md, err := findModuleDataForType(bi, typeAddr, mem)
+	if err != nil {
+		return nil, err
+	}
+
+	rtyp, err := bi.findType("runtime._type")
 	if err != nil {
 		return nil, err
 	}
 
 	if md == nil {
-		v, err := dbp.reflectOffsMapAccess(off)
+		v, err := reflectOffsMapAccess(bi, off, mem)
 		if err != nil {
 			return nil, err
 		}
 		v.loadValue(LoadConfig{false, 1, 0, 0, -1})
 		addr, _ := constant.Int64Val(v.Value)
-		return v.newVariable(v.Name, uintptr(addr), rtyp), nil
+		return v.newVariable(v.Name, uintptr(addr), rtyp, mem), nil
 	}
 
-	if t, _ := md.typemapVar.mapAccess(newConstant(constant.MakeUint64(uint64(off)), dbp.CurrentThread)); t != nil {
+	if t, _ := md.typemapVar.mapAccess(newConstant(constant.MakeUint64(uint64(off)), mem)); t != nil {
 		return t, nil
 	}
 
 	res := md.types + uintptr(off)
 
-	return dbp.CurrentThread.newVariable("", res, rtyp), nil
+	return newVariable("", res, rtyp, bi, mem), nil
 }
 
-func (dbp *Process) resolveNameOff(typeAddr uintptr, off uintptr) (name, tag string, pkgpathoff int32, err error) {
+func resolveNameOff(bi *BinaryInfo, typeAddr uintptr, off uintptr, mem MemoryReadWriter) (name, tag string, pkgpathoff int32, err error) {
 	// See runtime.resolveNameOff in $GOROOT/src/runtime/type.go
-	if err = dbp.loadModuleData(); err != nil {
+	if err = loadModuleData(bi, mem); err != nil {
 		return "", "", 0, err
 	}
 
-	for _, md := range dbp.moduleData {
+	for _, md := range bi.moduleData {
 		if typeAddr >= md.types && typeAddr < md.etypes {
-			return dbp.loadName(md.types + off)
+			return loadName(bi, md.types+off, mem)
 		}
 	}
 
-	v, err := dbp.reflectOffsMapAccess(off)
+	v, err := reflectOffsMapAccess(bi, off, mem)
 	if err != nil {
 		return "", "", 0, err
 	}
@@ -115,12 +124,12 @@ func (dbp *Process) resolveNameOff(typeAddr uintptr, off uintptr) (name, tag str
 		return "", "", 0, resv.Unreadable
 	}
 
-	return dbp.loadName(resv.Addr)
+	return loadName(bi, resv.Addr, mem)
 }
 
-func (dbp *Process) reflectOffsMapAccess(off uintptr) (*Variable, error) {
+func reflectOffsMapAccess(bi *BinaryInfo, off uintptr, mem MemoryReadWriter) (*Variable, error) {
-	scope := &EvalScope{Thread: dbp.CurrentThread, PC: 0, CFA: 0}
+	scope := globalScope(bi, mem)
-	reflectOffs, err := scope.packageVarAddr("runtime.reflectOffs")
+	reflectOffs, err := scope.findGlobal("runtime.reflectOffs")
 	if err != nil {
 		return nil, err
 	}
@@ -130,7 +139,7 @@ func (dbp *Process) reflectOffsMapAccess(off uintptr) (*Variable, error) {
 		return nil, err
 	}
 
-	return reflectOffsm.mapAccess(newConstant(constant.MakeUint64(uint64(off)), dbp.CurrentThread))
+	return reflectOffsm.mapAccess(newConstant(constant.MakeUint64(uint64(off)), mem))
 }
 
 const (
@@ -140,17 +149,19 @@ const (
 	nameflagHasPkg   = 1 << 2
 )
 
-func (dbp *Process) loadName(addr uintptr) (name, tag string, pkgpathoff int32, err error) {
+func loadName(bi *BinaryInfo, addr uintptr, mem MemoryReadWriter) (name, tag string, pkgpathoff int32, err error) {
 	off := addr
-	namedata, err := dbp.CurrentThread.readMemory(off, 3)
+	namedata := make([]byte, 3)
+	_, err = mem.ReadMemory(namedata, off)
 	off += 3
 	if err != nil {
 		return "", "", 0, err
 	}
 
-	namelen := uint16(namedata[1]<<8) | uint16(namedata[2])
+	namelen := uint16(namedata[1])<<8 | uint16(namedata[2])
 
-	rawstr, err := dbp.CurrentThread.readMemory(off, int(namelen))
+	rawstr := make([]byte, int(namelen))
+	_, err = mem.ReadMemory(rawstr, off)
 	off += uintptr(namelen)
 	if err != nil {
 		return "", "", 0, err
@@ -159,14 +170,16 @@ func (dbp *Process) loadName(addr uintptr) (name, tag string, pkgpathoff int32,
 	name = string(rawstr)
 
 	if namedata[0]&nameflagHasTag != 0 {
-		taglendata, err := dbp.CurrentThread.readMemory(off, 2)
+		taglendata := make([]byte, 2)
+		_, err = mem.ReadMemory(taglendata, off)
 		off += 2
 		if err != nil {
 			return "", "", 0, err
 		}
-		taglen := uint16(taglendata[0]<<8) | uint16(taglendata[1])
+		taglen := uint16(taglendata[0])<<8 | uint16(taglendata[1])
 
-		rawstr, err := dbp.CurrentThread.readMemory(off, int(taglen))
+		rawstr := make([]byte, int(taglen))
+		_, err = mem.ReadMemory(rawstr, off)
 		off += uintptr(taglen)
 		if err != nil {
 			return "", "", 0, err
@@ -176,7 +189,8 @@ func (dbp *Process) loadName(addr uintptr) (name, tag string, pkgpathoff int32,
 	}
 
 	if namedata[0]&nameflagHasPkg != 0 {
-		pkgdata, err := dbp.CurrentThread.readMemory(off, 4)
+		pkgdata := make([]byte, 4)
+		_, err = mem.ReadMemory(pkgdata, off)
 		if err != nil {
 			return "", "", 0, err
 		}

vendor/github.com/derekparker/delve/pkg/proc/native/exc_user_darwin.c

@@ -1,3 +1,5 @@
+//+build darwin,macnative
+
 /*
  * IDENTIFICATION:
  * stub generated Sun Feb 22 20:54:31 2015

vendor/github.com/derekparker/delve/pkg/proc/native/exec_darwin.c

@@ -1,3 +1,5 @@
+//+build darwin,macnative
+
 #include "exec_darwin.h"
 #include "stdio.h"
 

vendor/github.com/derekparker/delve/pkg/proc/native/exec_darwin.h

@@ -1,3 +1,5 @@
+//+build darwin,macnative
+
 #include "proc_darwin.h"
 
 #include <unistd.h>

vendor/github.com/derekparker/delve/pkg/proc/native/mach_exc_user_darwin.c

@@ -1,3 +1,5 @@
+//+build darwin,macnative
+
 /*
  * IDENTIFICATION:
  * stub generated Sat Feb 21 18:10:52 2015

vendor/github.com/derekparker/delve/pkg/proc/native/nonative_darwin.go

@@ -0,0 +1,128 @@
+//+build darwin,!macnative
+
+package native
+
+import (
+	"errors"
+	"sync"
+
+	"github.com/derekparker/delve/pkg/proc"
+)
+
+var ErrNativeBackendDisabled = errors.New("native backend disabled during compilation")
+
+// Launch returns ErrNativeBackendDisabled.
+func Launch(cmd []string, wd string, foreground bool) (*Process, error) {
+	return nil, ErrNativeBackendDisabled
+}
+
+// Attach returns ErrNativeBackendDisabled.
+func Attach(pid int) (*Process, error) {
+	return nil, ErrNativeBackendDisabled
+}
+
+// WaitStatus is a synonym for the platform-specific WaitStatus
+type WaitStatus struct{}
+
+// OSSpecificDetails holds information specific to the OSX/Darwin
+// operating system / kernel.
+type OSSpecificDetails struct{}
+
+// OSProcessDetails holds Darwin specific information.
+type OSProcessDetails struct{}
+
+func findExecutable(path string, pid int) string {
+	panic(ErrNativeBackendDisabled)
+}
+
+func killProcess(pid int) error {
+	panic(ErrNativeBackendDisabled)
+}
+
+func registers(thread *Thread, floatingPoint bool) (proc.Registers, error) {
+	panic(ErrNativeBackendDisabled)
+}
+
+func (dbp *Process) loadProcessInformation(wg *sync.WaitGroup) {
+	panic(ErrNativeBackendDisabled)
+}
+
+func (dbp *Process) requestManualStop() (err error) {
+	panic(ErrNativeBackendDisabled)
+}
+
+func (dbp *Process) resume() error {
+	panic(ErrNativeBackendDisabled)
+}
+
+func (dbp *Process) trapWait(pid int) (*Thread, error) {
+	panic(ErrNativeBackendDisabled)
+}
+
+func (dbp *Process) stop(trapthread *Thread) (err error) {
+	panic(ErrNativeBackendDisabled)
+}
+
+func (dbp *Process) updateThreadList() error {
+	panic(ErrNativeBackendDisabled)
+}
+
+func (dbp *Process) kill() (err error) {
+	panic(ErrNativeBackendDisabled)
+}
+
+func (dbp *Process) detach(kill bool) error {
+	panic(ErrNativeBackendDisabled)
+}
+
+func (dbp *Process) entryPoint() (uint64, error) {
+	panic(ErrNativeBackendDisabled)
+}
+
+// Blocked returns true if the thread is blocked
+func (t *Thread) Blocked() bool {
+	panic(ErrNativeBackendDisabled)
+}
+
+// SetPC sets the value of the PC register.
+func (thread *Thread) SetPC(pc uint64) error {
+	panic(ErrNativeBackendDisabled)
+}
+
+// SetSP sets the value of the SP register.
+func (thread *Thread) SetSP(sp uint64) error {
+	panic(ErrNativeBackendDisabled)
+}
+
+// SetDX sets the value of the DX register.
+func (thread *Thread) SetDX(dx uint64) error {
+	panic(ErrNativeBackendDisabled)
+}
+
+// ReadMemory reads len(buf) bytes at addr into buf.
+func (t *Thread) ReadMemory(buf []byte, addr uintptr) (int, error) {
+	panic(ErrNativeBackendDisabled)
+}
+
+// WriteMemory writes the contents of data at addr.
+func (t *Thread) WriteMemory(addr uintptr, data []byte) (int, error) {
+	panic(ErrNativeBackendDisabled)
+}
+
+func (t *Thread) resume() error {
+	panic(ErrNativeBackendDisabled)
+}
+
+func (t *Thread) singleStep() error {
+	panic(ErrNativeBackendDisabled)
+}
+
+func (t *Thread) restoreRegisters(sr proc.Registers) error {
+	panic(ErrNativeBackendDisabled)
+}
+
+// Stopped returns whether the thread is stopped at
+// the operating system level.
+func (t *Thread) Stopped() bool {
+	panic(ErrNativeBackendDisabled)
+}

vendor/github.com/derekparker/delve/pkg/proc/native/proc.go

@@ -0,0 +1,453 @@
+package native
+
+import (
+	"fmt"
+	"go/ast"
+	"runtime"
+	"sync"
+
+	"github.com/derekparker/delve/pkg/proc"
+)
+
+// Process represents all of the information the debugger
+// is holding onto regarding the process we are debugging.
+type Process struct {
+	bi  *proc.BinaryInfo
+	pid int // Process Pid
+
+	// Breakpoint table, holds information on breakpoints.
+	// Maps instruction address to Breakpoint struct.
+	breakpoints proc.BreakpointMap
+
+	// List of threads mapped as such: pid -> *Thread
+	threads map[int]*Thread
+
+	// Active thread
+	currentThread *Thread
+
+	// Goroutine that will be used by default to set breakpoint, eval variables, etc...
+	// Normally selectedGoroutine is currentThread.GetG, it will not be only if SwitchGoroutine is called with a goroutine that isn't attached to a thread
+	selectedGoroutine *proc.G
+
+	common              proc.CommonProcess
+	os                  *OSProcessDetails
+	firstStart          bool
+	stopMu              sync.Mutex
+	resumeChan          chan<- struct{}
+	ptraceChan          chan func()
+	ptraceDoneChan      chan interface{}
+	childProcess        bool // this process was launched, not attached to
+	manualStopRequested bool
+
+	exited, detached bool
+}
+
+// New returns an initialized Process struct. Before returning,
+// it will also launch a goroutine in order to handle ptrace(2)
+// functions. For more information, see the documentation on
+// `handlePtraceFuncs`.
+func New(pid int) *Process {
+	dbp := &Process{
+		pid:            pid,
+		threads:        make(map[int]*Thread),
+		breakpoints:    proc.NewBreakpointMap(),
+		firstStart:     true,
+		os:             new(OSProcessDetails),
+		ptraceChan:     make(chan func()),
+		ptraceDoneChan: make(chan interface{}),
+		bi:             proc.NewBinaryInfo(runtime.GOOS, runtime.GOARCH),
+	}
+	go dbp.handlePtraceFuncs()
+	return dbp
+}
+
+// BinInfo will return the binary info struct associated with this process.
+func (dbp *Process) BinInfo() *proc.BinaryInfo {
+	return dbp.bi
+}
+
+// Recorded always returns false for the native proc backend.
+func (dbp *Process) Recorded() (bool, string) { return false, "" }
+
+// Restart will always return an error in the native proc backend, only for
+// recorded traces.
+func (dbp *Process) Restart(string) error { return proc.ErrNotRecorded }
+
+// Direction will always return an error in the native proc backend, only for
+// recorded traces.
+func (dbp *Process) Direction(proc.Direction) error { return proc.ErrNotRecorded }
+
+// When will always return an empty string and nil, not supported on native proc backend.
+func (dbp *Process) When() (string, error) { return "", nil }
+
+// Checkpoint will always return an error on the native proc backend,
+// only supported for recorded traces.
+func (dbp *Process) Checkpoint(string) (int, error) { return -1, proc.ErrNotRecorded }
+
+// Checkpoints will always return an error on the native proc backend,
+// only supported for recorded traces.
+func (dbp *Process) Checkpoints() ([]proc.Checkpoint, error) { return nil, proc.ErrNotRecorded }
+
+// ClearCheckpoint will always return an error on the native proc backend,
+// only supported in recorded traces.
+func (dbp *Process) ClearCheckpoint(int) error { return proc.ErrNotRecorded }
+
+// Detach from the process being debugged, optionally killing it.
+func (dbp *Process) Detach(kill bool) (err error) {
+	if dbp.exited {
+		return nil
+	}
+	if kill && dbp.childProcess {
+		err := dbp.kill()
+		if err != nil {
+			return err
+		}
+		dbp.bi.Close()
+		return nil
+	}
+	if !kill {
+		// Clean up any breakpoints we've set.
+		for _, bp := range dbp.breakpoints.M {
+			if bp != nil {
+				_, err := dbp.ClearBreakpoint(bp.Addr)
+				if err != nil {
+					return err
+				}
+			}
+		}
+	}
+	dbp.execPtraceFunc(func() {
+		err = dbp.detach(kill)
+		if err != nil {
+			return
+		}
+		if kill {
+			err = killProcess(dbp.pid)
+		}
+	})
+	dbp.detached = true
+	dbp.postExit()
+	return
+}
+
+// Valid returns whether the process is still attached to and
+// has not exited.
+func (dbp *Process) Valid() (bool, error) {
+	if dbp.detached {
+		return false, &proc.ProcessDetachedError{}
+	}
+	if dbp.exited {
+		return false, &proc.ErrProcessExited{Pid: dbp.Pid()}
+	}
+	return true, nil
+}
+
+// ResumeNotify specifies a channel that will be closed the next time
+// ContinueOnce finishes resuming the target.
+func (dbp *Process) ResumeNotify(ch chan<- struct{}) {
+	dbp.resumeChan = ch
+}
+
+// Pid returns the process ID.
+func (dbp *Process) Pid() int {
+	return dbp.pid
+}
+
+// SelectedGoroutine returns the current selected,
+// active goroutine.
+func (dbp *Process) SelectedGoroutine() *proc.G {
+	return dbp.selectedGoroutine
+}
+
+// ThreadList returns a list of threads in the process.
+func (dbp *Process) ThreadList() []proc.Thread {
+	r := make([]proc.Thread, 0, len(dbp.threads))
+	for _, v := range dbp.threads {
+		r = append(r, v)
+	}
+	return r
+}
+
+// FindThread attempts to find the thread with the specified ID.
+func (dbp *Process) FindThread(threadID int) (proc.Thread, bool) {
+	th, ok := dbp.threads[threadID]
+	return th, ok
+}
+
+// CurrentThread returns the current selected, active thread.
+func (dbp *Process) CurrentThread() proc.Thread {
+	return dbp.currentThread
+}
+
+// Breakpoints returns a list of breakpoints currently set.
+func (dbp *Process) Breakpoints() *proc.BreakpointMap {
+	return &dbp.breakpoints
+}
+
+// LoadInformation finds the executable and then uses it
+// to parse the following information:
+// * Dwarf .debug_frame section
+// * Dwarf .debug_line section
+// * Go symbol table.
+func (dbp *Process) LoadInformation(path string) error {
+	var wg sync.WaitGroup
+
+	path = findExecutable(path, dbp.pid)
+
+	entryPoint, err := dbp.entryPoint()
+	if err != nil {
+		return err
+	}
+
+	wg.Add(1)
+	go dbp.loadProcessInformation(&wg)
+	err = dbp.bi.LoadBinaryInfo(path, entryPoint, &wg)
+	wg.Wait()
+	if err == nil {
+		err = dbp.bi.LoadError()
+	}
+
+	return err
+}
+
+// RequestManualStop sets the `halt` flag and
+// sends SIGSTOP to all threads.
+func (dbp *Process) RequestManualStop() error {
+	if dbp.exited {
+		return &proc.ErrProcessExited{Pid: dbp.Pid()}
+	}
+	dbp.stopMu.Lock()
+	defer dbp.stopMu.Unlock()
+	dbp.manualStopRequested = true
+	return dbp.requestManualStop()
+}
+
+// CheckAndClearManualStopRequest checks if a manual stop has
+// been requested, and then clears that state.
+func (dbp *Process) CheckAndClearManualStopRequest() bool {
+	dbp.stopMu.Lock()
+	defer dbp.stopMu.Unlock()
+
+	msr := dbp.manualStopRequested
+	dbp.manualStopRequested = false
+
+	return msr
+}
+
+func (dbp *Process) writeBreakpoint(addr uint64) (string, int, *proc.Function, []byte, error) {
+	f, l, fn := dbp.bi.PCToLine(uint64(addr))
+	if fn == nil {
+		return "", 0, nil, nil, proc.InvalidAddressError{Address: addr}
+	}
+
+	originalData := make([]byte, dbp.bi.Arch.BreakpointSize())
+	_, err := dbp.currentThread.ReadMemory(originalData, uintptr(addr))
+	if err != nil {
+		return "", 0, nil, nil, err
+	}
+	if err := dbp.writeSoftwareBreakpoint(dbp.currentThread, addr); err != nil {
+		return "", 0, nil, nil, err
+	}
+
+	return f, l, fn, originalData, nil
+}
+
+// SetBreakpoint sets a breakpoint at addr, and stores it in the process wide
+// break point table.
+func (dbp *Process) SetBreakpoint(addr uint64, kind proc.BreakpointKind, cond ast.Expr) (*proc.Breakpoint, error) {
+	return dbp.breakpoints.Set(addr, kind, cond, dbp.writeBreakpoint)
+}
+
+// ClearBreakpoint clears the breakpoint at addr.
+func (dbp *Process) ClearBreakpoint(addr uint64) (*proc.Breakpoint, error) {
+	if dbp.exited {
+		return nil, &proc.ErrProcessExited{Pid: dbp.Pid()}
+	}
+	return dbp.breakpoints.Clear(addr, dbp.currentThread.ClearBreakpoint)
+}
+
+// ContinueOnce will continue the target until it stops.
+// This could be the result of a breakpoint or signal.
+func (dbp *Process) ContinueOnce() (proc.Thread, error) {
+	if dbp.exited {
+		return nil, &proc.ErrProcessExited{Pid: dbp.Pid()}
+	}
+
+	if err := dbp.resume(); err != nil {
+		return nil, err
+	}
+
+	dbp.common.ClearAllGCache()
+	for _, th := range dbp.threads {
+		th.CurrentBreakpoint.Clear()
+	}
+
+	if dbp.resumeChan != nil {
+		close(dbp.resumeChan)
+		dbp.resumeChan = nil
+	}
+
+	trapthread, err := dbp.trapWait(-1)
+	if err != nil {
+		return nil, err
+	}
+	if err := dbp.stop(trapthread); err != nil {
+		return nil, err
+	}
+	return trapthread, err
+}
+
+// StepInstruction will continue the current thread for exactly
+// one instruction. This method affects only the thread
+// associated with the selected goroutine. All other
+// threads will remain stopped.
+func (dbp *Process) StepInstruction() (err error) {
+	thread := dbp.currentThread
+	if dbp.selectedGoroutine != nil {
+		if dbp.selectedGoroutine.Thread == nil {
+			// Step called on parked goroutine
+			if _, err := dbp.SetBreakpoint(dbp.selectedGoroutine.PC, proc.NextBreakpoint, proc.SameGoroutineCondition(dbp.selectedGoroutine)); err != nil {
+				return err
+			}
+			return proc.Continue(dbp)
+		}
+		thread = dbp.selectedGoroutine.Thread.(*Thread)
+	}
+	dbp.common.ClearAllGCache()
+	if dbp.exited {
+		return &proc.ErrProcessExited{Pid: dbp.Pid()}
+	}
+	thread.CurrentBreakpoint.Clear()
+	err = thread.StepInstruction()
+	if err != nil {
+		return err
+	}
+	err = thread.SetCurrentBreakpoint()
+	if err != nil {
+		return err
+	}
+	if g, _ := proc.GetG(thread); g != nil {
+		dbp.selectedGoroutine = g
+	}
+	return nil
+}
+
+// SwitchThread changes from current thread to the thread specified by `tid`.
+func (dbp *Process) SwitchThread(tid int) error {
+	if dbp.exited {
+		return &proc.ErrProcessExited{Pid: dbp.Pid()}
+	}
+	if th, ok := dbp.threads[tid]; ok {
+		dbp.currentThread = th
+		dbp.selectedGoroutine, _ = proc.GetG(dbp.currentThread)
+		return nil
+	}
+	return fmt.Errorf("thread %d does not exist", tid)
+}
+
+// SwitchGoroutine changes from current thread to the thread
+// running the specified goroutine.
+func (dbp *Process) SwitchGoroutine(gid int) error {
+	if dbp.exited {
+		return &proc.ErrProcessExited{Pid: dbp.Pid()}
+	}
+	g, err := proc.FindGoroutine(dbp, gid)
+	if err != nil {
+		return err
+	}
+	if g == nil {
+		// user specified -1 and selectedGoroutine is nil
+		return nil
+	}
+	if g.Thread != nil {
+		return dbp.SwitchThread(g.Thread.ThreadID())
+	}
+	dbp.selectedGoroutine = g
+	return nil
+}
+
+// FindBreakpoint finds the breakpoint for the given pc.
+func (dbp *Process) FindBreakpoint(pc uint64) (*proc.Breakpoint, bool) {
+	// Check to see if address is past the breakpoint, (i.e. breakpoint was hit).
+	if bp, ok := dbp.breakpoints.M[pc-uint64(dbp.bi.Arch.BreakpointSize())]; ok {
+		return bp, true
+	}
+	// Directly use addr to lookup breakpoint.
+	if bp, ok := dbp.breakpoints.M[pc]; ok {
+		return bp, true
+	}
+	return nil, false
+}
+
+// Returns a new Process struct.
+func initializeDebugProcess(dbp *Process, path string) (*Process, error) {
+	err := dbp.LoadInformation(path)
+	if err != nil {
+		return dbp, err
+	}
+
+	if err := dbp.updateThreadList(); err != nil {
+		return dbp, err
+	}
+
+	// selectedGoroutine can not be set correctly by the call to updateThreadList
+	// because without calling SetGStructOffset we can not read the G struct of currentThread
+	// but without calling updateThreadList we can not examine memory to determine
+	// the offset of g struct inside TLS
+	dbp.selectedGoroutine, _ = proc.GetG(dbp.currentThread)
+
+	proc.CreateUnrecoveredPanicBreakpoint(dbp, dbp.writeBreakpoint, &dbp.breakpoints)
+
+	return dbp, nil
+}
+
+// ClearInternalBreakpoints will clear all non-user set breakpoints. These
+// breakpoints are set for internal operations such as 'next'.
+func (dbp *Process) ClearInternalBreakpoints() error {
+	return dbp.breakpoints.ClearInternalBreakpoints(func(bp *proc.Breakpoint) error {
+		if err := dbp.currentThread.ClearBreakpoint(bp); err != nil {
+			return err
+		}
+		for _, thread := range dbp.threads {
+			if thread.CurrentBreakpoint.Breakpoint == bp {
+				thread.CurrentBreakpoint.Clear()
+			}
+		}
+		return nil
+	})
+}
+
+func (dbp *Process) handlePtraceFuncs() {
+	// We must ensure here that we are running on the same thread during
+	// while invoking the ptrace(2) syscall. This is due to the fact that ptrace(2) expects
+	// all commands after PTRACE_ATTACH to come from the same thread.
+	runtime.LockOSThread()
+
+	for fn := range dbp.ptraceChan {
+		fn()
+		dbp.ptraceDoneChan <- nil
+	}
+}
+
+func (dbp *Process) execPtraceFunc(fn func()) {
+	dbp.ptraceChan <- fn
+	<-dbp.ptraceDoneChan
+}
+
+func (dbp *Process) postExit() {
+	dbp.exited = true
+	close(dbp.ptraceChan)
+	close(dbp.ptraceDoneChan)
+	dbp.bi.Close()
+}
+
+func (dbp *Process) writeSoftwareBreakpoint(thread *Thread, addr uint64) error {
+	_, err := thread.WriteMemory(uintptr(addr), dbp.bi.Arch.BreakpointInstruction())
+	return err
+}
+
+// Common returns common information across Process
+// implementations
+func (dbp *Process) Common() *proc.CommonProcess {
+	return &dbp.common
+}

vendor/github.com/derekparker/delve/pkg/proc/native/proc_darwin.c

@@ -1,3 +1,5 @@
+//+build darwin,macnative
+
 #include "proc_darwin.h"
 
 static const unsigned char info_plist[]

vendor/github.com/derekparker/delve/pkg/proc/native/proc_darwin.go

@@ -1,4 +1,6 @@
-package proc
+//+build darwin,macnative
+
+package native
 
 // #include "proc_darwin.h"
 // #include "threads_darwin.h"
@@ -6,7 +8,6 @@ package proc
 // #include <stdlib.h>
 import "C"
 import (
-	"debug/gosym"
 	"errors"
 	"fmt"
 	"os"
@@ -15,11 +16,9 @@ import (
 	"sync"
 	"unsafe"
 
-	"golang.org/x/debug/macho"
-
-	"github.com/derekparker/delve/dwarf/frame"
-	"github.com/derekparker/delve/dwarf/line"
 	sys "golang.org/x/sys/unix"
+
+	"github.com/derekparker/delve/pkg/proc"
 )
 
 // OSProcessDetails holds Darwin specific information.
@@ -28,6 +27,7 @@ type OSProcessDetails struct {
 	exceptionPort    C.mach_port_t // mach port for receiving mach exceptions.
 	notificationPort C.mach_port_t // mach port for dead name notification (process exit).
 	initialized      bool
+	halt             bool
 
 	// the main port we use, will return messages from both the
 	// exception and notification ports.
@@ -38,10 +38,10 @@ type OSProcessDetails struct {
 // custom fork/exec process in order to take advantage of
 // PT_SIGEXC on Darwin which will turn Unix signals into
 // Mach exceptions.
-func Launch(cmd []string, wd string) (*Process, error) {
+func Launch(cmd []string, wd string, foreground bool) (*Process, error) {
 	// check that the argument to Launch is an executable file
 	if fi, staterr := os.Stat(cmd[0]); staterr == nil && (fi.Mode()&0111) == 0 {
-		return nil, NotExecutableErr
+		return nil, proc.ErrNotExecutable
 	}
 	argv0Go, err := filepath.Abs(cmd[0])
 	if err != nil {
@@ -77,7 +77,8 @@ func Launch(cmd []string, wd string) (*Process, error) {
 	if pid <= 0 {
 		return nil, fmt.Errorf("could not fork/exec")
 	}
-	dbp.Pid = pid
+	dbp.pid = pid
+	dbp.childProcess = true
 	for i := range argvSlice {
 		C.free(unsafe.Pointer(argvSlice[i]))
 	}
@@ -86,12 +87,17 @@ func Launch(cmd []string, wd string) (*Process, error) {
 	// trapWait to wait until the child process calls execve.
 
 	for {
-		err = dbp.updateThreadListForTask(C.get_task_for_pid(C.int(dbp.Pid)))
+		task := C.get_task_for_pid(C.int(dbp.pid))
-		if err == nil {
+		// The task_for_pid call races with the fork call. This can
-			break
+		// result in the parent task being returned instead of the child.
-		}
+		if task != dbp.os.task {
-		if err != couldNotGetThreadCount && err != couldNotGetThreadList {
+			err = dbp.updateThreadListForTask(task)
-			return nil, err
+			if err == nil {
+				break
+			}
+			if err != couldNotGetThreadCount && err != couldNotGetThreadList {
+				return nil, err
+			}
 		}
 	}
 
@@ -99,26 +105,21 @@ func Launch(cmd []string, wd string) (*Process, error) {
 		return nil, err
 	}
 
-	dbp.allGCache = nil
+	dbp.common.ClearAllGCache()
-	for _, th := range dbp.Threads {
+	for _, th := range dbp.threads {
-		th.clearBreakpointState()
+		th.CurrentBreakpoint.Clear()
 	}
 
 	trapthread, err := dbp.trapWait(-1)
 	if err != nil {
 		return nil, err
 	}
-	if err := dbp.Halt(); err != nil {
+	if err := dbp.stop(nil); err != nil {
-		return nil, dbp.exitGuard(err)
-	}
-
-	_, err = dbp.waitForStop()
-	if err != nil {
 		return nil, err
 	}
 
 	dbp.os.initialized = true
-	dbp, err = initializeDebugProcess(dbp, argv0Go, false)
+	dbp, err = initializeDebugProcess(dbp, argv0Go)
 	if err != nil {
 		return nil, err
 	}
@@ -144,19 +145,34 @@ func Attach(pid int) (*Process, error) {
 
 	dbp.os.initialized = true
 
-	return initializeDebugProcess(dbp, "", true)
+	var err error
+	dbp.execPtraceFunc(func() { err = PtraceAttach(dbp.pid) })
+	if err != nil {
+		return nil, err
+	}
+	_, _, err = dbp.wait(dbp.pid, 0)
+	if err != nil {
+		return nil, err
+	}
+
+	dbp, err = initializeDebugProcess(dbp, "")
+	if err != nil {
+		dbp.Detach(false)
+		return nil, err
+	}
+	return dbp, nil
 }
 
 // Kill kills the process.
-func (dbp *Process) Kill() (err error) {
+func (dbp *Process) kill() (err error) {
 	if dbp.exited {
 		return nil
 	}
-	err = sys.Kill(-dbp.Pid, sys.SIGKILL)
+	err = sys.Kill(-dbp.pid, sys.SIGKILL)
 	if err != nil {
 		return errors.New("could not deliver signal: " + err.Error())
 	}
-	for port := range dbp.Threads {
+	for port := range dbp.threads {
 		if C.thread_resume(C.thread_act_t(port)) != C.KERN_SUCCESS {
 			return errors.New("could not resume task")
 		}
@@ -175,9 +191,10 @@ func (dbp *Process) Kill() (err error) {
 func (dbp *Process) requestManualStop() (err error) {
 	var (
 		task          = C.mach_port_t(dbp.os.task)
-		thread        = C.mach_port_t(dbp.CurrentThread.os.threadAct)
+		thread        = C.mach_port_t(dbp.currentThread.os.threadAct)
 		exceptionPort = C.mach_port_t(dbp.os.exceptionPort)
 	)
+	dbp.os.halt = true
 	kret := C.raise_exception(task, thread, exceptionPort, C.EXC_BREAKPOINT)
 	if kret != C.KERN_SUCCESS {
 		return fmt.Errorf("could not raise mach exception")
@@ -218,12 +235,12 @@ func (dbp *Process) updateThreadListForTask(task C.task_t) error {
 		return couldNotGetThreadList
 	}
 
-	for _, thread := range dbp.Threads {
+	for _, thread := range dbp.threads {
 		thread.os.exists = false
 	}
 
 	for _, port := range list {
-		thread, ok := dbp.Threads[int(port)]
+		thread, ok := dbp.threads[int(port)]
 		if !ok {
 			thread, err = dbp.addThread(int(port), false)
 			if err != nil {
@@ -233,9 +250,9 @@ func (dbp *Process) updateThreadListForTask(task C.task_t) error {
 		thread.os.exists = true
 	}
 
-	for threadID, thread := range dbp.Threads {
+	for threadID, thread := range dbp.threads {
 		if !thread.os.exists {
-			delete(dbp.Threads, threadID)
+			delete(dbp.threads, threadID)
 		}
 	}
 
@@ -243,7 +260,7 @@ func (dbp *Process) updateThreadListForTask(task C.task_t) error {
 }
 
 func (dbp *Process) addThread(port int, attach bool) (*Thread, error) {
-	if thread, ok := dbp.Threads[port]; ok {
+	if thread, ok := dbp.threads[port]; ok {
 		return thread, nil
 	}
 	thread := &Thread{
@@ -251,107 +268,19 @@ func (dbp *Process) addThread(port int, attach bool) (*Thread, error) {
 		dbp: dbp,
 		os:  new(OSSpecificDetails),
 	}
-	dbp.Threads[port] = thread
+	dbp.threads[port] = thread
 	thread.os.threadAct = C.thread_act_t(port)
-	if dbp.CurrentThread == nil {
+	if dbp.currentThread == nil {
 		dbp.SwitchThread(thread.ID)
 	}
 	return thread, nil
 }
 
-func (dbp *Process) parseDebugFrame(exe *macho.File, wg *sync.WaitGroup) {
+func findExecutable(path string, pid int) string {
-	defer wg.Done()
-
-	debugFrameSec := exe.Section("__debug_frame")
-	debugInfoSec := exe.Section("__debug_info")
-
-	if debugFrameSec != nil && debugInfoSec != nil {
-		debugFrame, err := exe.Section("__debug_frame").Data()
-		if err != nil {
-			fmt.Println("could not get __debug_frame section", err)
-			os.Exit(1)
-		}
-		dat, err := debugInfoSec.Data()
-		if err != nil {
-			fmt.Println("could not get .debug_info section", err)
-			os.Exit(1)
-		}
-		dbp.frameEntries = frame.Parse(debugFrame, frame.DwarfEndian(dat))
-	} else {
-		fmt.Println("could not find __debug_frame section in binary")
-		os.Exit(1)
-	}
-}
-
-func (dbp *Process) obtainGoSymbols(exe *macho.File, wg *sync.WaitGroup) {
-	defer wg.Done()
-
-	var (
-		symdat  []byte
-		pclndat []byte
-		err     error
-	)
-
-	if sec := exe.Section("__gosymtab"); sec != nil {
-		symdat, err = sec.Data()
-		if err != nil {
-			fmt.Println("could not get .gosymtab section", err)
-			os.Exit(1)
-		}
-	}
-
-	if sec := exe.Section("__gopclntab"); sec != nil {
-		pclndat, err = sec.Data()
-		if err != nil {
-			fmt.Println("could not get .gopclntab section", err)
-			os.Exit(1)
-		}
-	}
-
-	pcln := gosym.NewLineTable(pclndat, exe.Section("__text").Addr)
-	tab, err := gosym.NewTable(symdat, pcln)
-	if err != nil {
-		fmt.Println("could not get initialize line table", err)
-		os.Exit(1)
-	}
-
-	dbp.goSymTable = tab
-}
-
-func (dbp *Process) parseDebugLineInfo(exe *macho.File, wg *sync.WaitGroup) {
-	defer wg.Done()
-
-	if sec := exe.Section("__debug_line"); sec != nil {
-		debugLine, err := exe.Section("__debug_line").Data()
-		if err != nil {
-			fmt.Println("could not get __debug_line section", err)
-			os.Exit(1)
-		}
-		dbp.lineInfo = line.Parse(debugLine)
-	} else {
-		fmt.Println("could not find __debug_line section in binary")
-		os.Exit(1)
-	}
-}
-
-var UnsupportedArchErr = errors.New("unsupported architecture - only darwin/amd64 is supported")
-
-func (dbp *Process) findExecutable(path string) (*macho.File, string, error) {
 	if path == "" {
-		path = C.GoString(C.find_executable(C.int(dbp.Pid)))
+		path = C.GoString(C.find_executable(C.int(pid)))
 	}
-	exe, err := macho.Open(path)
+	return path
-	if err != nil {
-		return nil, path, err
-	}
-	if exe.Cpu != macho.CpuAmd64 {
-		return nil, path, UnsupportedArchErr
-	}
-	dbp.dwarf, err = exe.DWARF()
-	if err != nil {
-		return nil, path, err
-	}
-	return exe, path, nil
 }
 
 func (dbp *Process) trapWait(pid int) (*Thread, error) {
@@ -369,19 +298,22 @@ func (dbp *Process) trapWait(pid int) (*Thread, error) {
 				continue
 			}
 			if !dbp.os.initialized {
-				if pidtask := C.get_task_for_pid(C.int(dbp.Pid)); pidtask != 0 && dbp.os.task != pidtask {
+				if pidtask := C.get_task_for_pid(C.int(dbp.pid)); pidtask != 0 && dbp.os.task != pidtask {
 					continue
 				}
 			}
-			_, status, err := dbp.wait(dbp.Pid, 0)
+			_, status, err := dbp.wait(dbp.pid, 0)
 			if err != nil {
 				return nil, err
 			}
 			dbp.postExit()
-			return nil, ProcessExitedError{Pid: dbp.Pid, Status: status.ExitStatus()}
+			return nil, proc.ErrProcessExited{Pid: dbp.pid, Status: status.ExitStatus()}
 
 		case C.MACH_RCV_INTERRUPTED:
-			if !dbp.halt {
+			dbp.stopMu.Lock()
+			halt := dbp.os.halt
+			dbp.stopMu.Unlock()
+			if !halt {
 				// Call trapWait again, it seems
 				// MACH_RCV_INTERRUPTED is emitted before
 				// process natural death _sometimes_.
@@ -407,10 +339,13 @@ func (dbp *Process) trapWait(pid int) (*Thread, error) {
 		// Since we cannot be notified of new threads on OS X
 		// this is as good a time as any to check for them.
 		dbp.updateThreadList()
-		th, ok := dbp.Threads[int(port)]
+		th, ok := dbp.threads[int(port)]
 		if !ok {
-			if dbp.halt {
+			dbp.stopMu.Lock()
-				dbp.halt = false
+			halt := dbp.os.halt
+			dbp.stopMu.Unlock()
+			if halt {
+				dbp.os.halt = false
 				return th, nil
 			}
 			if dbp.firstStart || th.singleStepping {
@@ -427,7 +362,7 @@ func (dbp *Process) trapWait(pid int) (*Thread, error) {
 }
 
 func (dbp *Process) waitForStop() ([]int, error) {
-	ports := make([]int, 0, len(dbp.Threads))
+	ports := make([]int, 0, len(dbp.threads))
 	count := 0
 	for {
 		var task C.task_t
@@ -448,23 +383,6 @@ func (dbp *Process) waitForStop() ([]int, error) {
 	}
 }
 
-func (dbp *Process) setCurrentBreakpoints(trapthread *Thread) error {
-	ports, err := dbp.waitForStop()
-	if err != nil {
-		return err
-	}
-	trapthread.SetCurrentBreakpoint()
-	for _, port := range ports {
-		if th, ok := dbp.Threads[port]; ok {
-			err := th.SetCurrentBreakpoint()
-			if err != nil {
-				return err
-			}
-		}
-	}
-	return nil
-}
-
 func (dbp *Process) loadProcessInformation(wg *sync.WaitGroup) {
 	wg.Done()
 }
@@ -483,29 +401,70 @@ func (dbp *Process) exitGuard(err error) error {
 	if err != ErrContinueThread {
 		return err
 	}
-	_, status, werr := dbp.wait(dbp.Pid, sys.WNOHANG)
+	_, status, werr := dbp.wait(dbp.pid, sys.WNOHANG)
 	if werr == nil && status.Exited() {
 		dbp.postExit()
-		return ProcessExitedError{Pid: dbp.Pid, Status: status.ExitStatus()}
+		return proc.ErrProcessExited{Pid: dbp.pid, Status: status.ExitStatus()}
 	}
 	return err
 }
 
 func (dbp *Process) resume() error {
 	// all threads stopped over a breakpoint are made to step over it
-	for _, thread := range dbp.Threads {
+	for _, thread := range dbp.threads {
-		if thread.CurrentBreakpoint != nil {
+		if thread.CurrentBreakpoint.Breakpoint != nil {
 			if err := thread.StepInstruction(); err != nil {
 				return err
 			}
-			thread.CurrentBreakpoint = nil
+			thread.CurrentBreakpoint.Clear()
 		}
 	}
 	// everything is resumed
-	for _, thread := range dbp.Threads {
+	for _, thread := range dbp.threads {
 		if err := thread.resume(); err != nil {
 			return dbp.exitGuard(err)
 		}
 	}
 	return nil
 }
+
+// stop stops all running threads and sets breakpoints
+func (dbp *Process) stop(trapthread *Thread) (err error) {
+	if dbp.exited {
+		return &proc.ErrProcessExited{Pid: dbp.Pid()}
+	}
+	for _, th := range dbp.threads {
+		if !th.Stopped() {
+			if err := th.stop(); err != nil {
+				return dbp.exitGuard(err)
+			}
+		}
+	}
+
+	ports, err := dbp.waitForStop()
+	if err != nil {
+		return err
+	}
+	if !dbp.os.initialized {
+		return nil
+	}
+	trapthread.SetCurrentBreakpoint()
+	for _, port := range ports {
+		if th, ok := dbp.threads[port]; ok {
+			err := th.SetCurrentBreakpoint()
+			if err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+func (dbp *Process) detach(kill bool) error {
+	return PtraceDetach(dbp.pid, 0)
+}
+
+func (dbp *Process) entryPoint() (uint64, error) {
+	//TODO(aarzilli): implement this
+	return 0, nil
+}

vendor/github.com/derekparker/delve/pkg/proc/native/proc_darwin.h

@@ -1,3 +1,5 @@
+//+build darwin,macnative
+
 #include <sys/types.h>
 #include <libproc.h>
 #include <mach/mach.h>

vendor/github.com/derekparker/delve/pkg/proc/native/proc_linux.go

@@ -1,13 +1,13 @@
-package proc
+package native
 
 import (
 	"bytes"
-	"debug/gosym"
 	"errors"
 	"fmt"
 	"io/ioutil"
 	"os"
 	"os/exec"
+	"os/signal"
 	"path/filepath"
 	"regexp"
 	"strconv"
@@ -18,9 +18,9 @@ import (
 
 	sys "golang.org/x/sys/unix"
 
-	"github.com/derekparker/delve/dwarf/frame"
+	"github.com/derekparker/delve/pkg/proc"
-	"github.com/derekparker/delve/dwarf/line"
+	"github.com/derekparker/delve/pkg/proc/linutil"
-	"golang.org/x/debug/elf"
+	"github.com/mattn/go-isatty"
 )
 
 // Process statuses
@@ -46,55 +46,86 @@ type OSProcessDetails struct {
 // Launch creates and begins debugging a new process. First entry in
 // `cmd` is the program to run, and then rest are the arguments
 // to be supplied to that process. `wd` is working directory of the program.
-func Launch(cmd []string, wd string) (*Process, error) {
+func Launch(cmd []string, wd string, foreground bool) (*Process, error) {
 	var (
-		proc *exec.Cmd
+		process *exec.Cmd
-		err  error
+		err     error
 	)
 	// check that the argument to Launch is an executable file
 	if fi, staterr := os.Stat(cmd[0]); staterr == nil && (fi.Mode()&0111) == 0 {
-		return nil, NotExecutableErr
+		return nil, proc.ErrNotExecutable
 	}
+
+	if !isatty.IsTerminal(os.Stdin.Fd()) {
+		// exec.(*Process).Start will fail if we try to send a process to
+		// foreground but we are not attached to a terminal.
+		foreground = false
+	}
+
 	dbp := New(0)
+	dbp.common = proc.NewCommonProcess(true)
 	dbp.execPtraceFunc(func() {
-		proc = exec.Command(cmd[0])
+		process = exec.Command(cmd[0])
-		proc.Args = cmd
+		process.Args = cmd
-		proc.Stdout = os.Stdout
+		process.Stdout = os.Stdout
-		proc.Stderr = os.Stderr
+		process.Stderr = os.Stderr
-		proc.SysProcAttr = &syscall.SysProcAttr{Ptrace: true, Setpgid: true}
+		process.SysProcAttr = &syscall.SysProcAttr{Ptrace: true, Setpgid: true, Foreground: foreground}
-		if wd != "" {
+		if foreground {
-			proc.Dir = wd
+			signal.Ignore(syscall.SIGTTOU, syscall.SIGTTIN)
+			process.Stdin = os.Stdin
 		}
-		err = proc.Start()
+		if wd != "" {
+			process.Dir = wd
+		}
+		err = process.Start()
 	})
 	if err != nil {
 		return nil, err
 	}
-	dbp.Pid = proc.Process.Pid
+	dbp.pid = process.Process.Pid
-	_, _, err = dbp.wait(proc.Process.Pid, 0)
+	dbp.childProcess = true
+	_, _, err = dbp.wait(process.Process.Pid, 0)
 	if err != nil {
 		return nil, fmt.Errorf("waiting for target execve failed: %s", err)
 	}
-	return initializeDebugProcess(dbp, proc.Path, false)
+	return initializeDebugProcess(dbp, process.Path)
 }
 
 // Attach to an existing process with the given PID.
 func Attach(pid int) (*Process, error) {
-	return initializeDebugProcess(New(pid), "", true)
+	dbp := New(pid)
+	dbp.common = proc.NewCommonProcess(true)
+
+	var err error
+	dbp.execPtraceFunc(func() { err = PtraceAttach(dbp.pid) })
+	if err != nil {
+		return nil, err
+	}
+	_, _, err = dbp.wait(dbp.pid, 0)
+	if err != nil {
+		return nil, err
+	}
+
+	dbp, err = initializeDebugProcess(dbp, "")
+	if err != nil {
+		dbp.Detach(false)
+		return nil, err
+	}
+	return dbp, nil
 }
 
-// Kill kills the target process.
+// kill kills the target process.
-func (dbp *Process) Kill() (err error) {
+func (dbp *Process) kill() (err error) {
 	if dbp.exited {
 		return nil
 	}
-	if !dbp.Threads[dbp.Pid].Stopped() {
+	if !dbp.threads[dbp.pid].Stopped() {
 		return errors.New("process must be stopped in order to kill it")
 	}
-	if err = sys.Kill(-dbp.Pid, sys.SIGKILL); err != nil {
+	if err = sys.Kill(-dbp.pid, sys.SIGKILL); err != nil {
 		return errors.New("could not deliver signal " + err.Error())
 	}
-	if _, _, err = dbp.wait(dbp.Pid, 0); err != nil {
+	if _, _, err = dbp.wait(dbp.pid, 0); err != nil {
 		return
 	}
 	dbp.postExit()
@@ -102,13 +133,13 @@ func (dbp *Process) Kill() (err error) {
 }
 
 func (dbp *Process) requestManualStop() (err error) {
-	return sys.Kill(dbp.Pid, sys.SIGTRAP)
+	return sys.Kill(dbp.pid, sys.SIGTRAP)
 }
 
 // Attach to a newly created thread, and store that thread in our list of
 // known threads.
 func (dbp *Process) addThread(tid int, attach bool) (*Thread, error) {
-	if thread, ok := dbp.Threads[tid]; ok {
+	if thread, ok := dbp.threads[tid]; ok {
 		return thread, nil
 	}
 
@@ -122,7 +153,7 @@ func (dbp *Process) addThread(tid int, attach bool) (*Thread, error) {
 			// if we truly don't have permissions.
 			return nil, fmt.Errorf("could not attach to new thread %d %s", tid, err)
 		}
-		pid, status, err := dbp.wait(tid, 0)
+		pid, status, err := dbp.waitFast(tid)
 		if err != nil {
 			return nil, err
 		}
@@ -133,7 +164,7 @@ func (dbp *Process) addThread(tid int, attach bool) (*Thread, error) {
 
 	dbp.execPtraceFunc(func() { err = syscall.PtraceSetOptions(tid, syscall.PTRACE_O_TRACECLONE) })
 	if err == syscall.ESRCH {
-		if _, _, err = dbp.wait(tid, 0); err != nil {
+		if _, _, err = dbp.waitFast(tid); err != nil {
 			return nil, fmt.Errorf("error while waiting after adding thread: %d %s", tid, err)
 		}
 		dbp.execPtraceFunc(func() { err = syscall.PtraceSetOptions(tid, syscall.PTRACE_O_TRACECLONE) })
@@ -145,132 +176,44 @@ func (dbp *Process) addThread(tid int, attach bool) (*Thread, error) {
 		}
 	}
 
-	dbp.Threads[tid] = &Thread{
+	dbp.threads[tid] = &Thread{
 		ID:  tid,
 		dbp: dbp,
 		os:  new(OSSpecificDetails),
 	}
-	if dbp.CurrentThread == nil {
+	if dbp.currentThread == nil {
 		dbp.SwitchThread(tid)
 	}
-	return dbp.Threads[tid], nil
+	return dbp.threads[tid], nil
 }
 
 func (dbp *Process) updateThreadList() error {
-	tids, _ := filepath.Glob(fmt.Sprintf("/proc/%d/task/*", dbp.Pid))
+	tids, _ := filepath.Glob(fmt.Sprintf("/proc/%d/task/*", dbp.pid))
 	for _, tidpath := range tids {
 		tidstr := filepath.Base(tidpath)
 		tid, err := strconv.Atoi(tidstr)
 		if err != nil {
 			return err
 		}
-		if _, err := dbp.addThread(tid, tid != dbp.Pid); err != nil {
+		if _, err := dbp.addThread(tid, tid != dbp.pid); err != nil {
 			return err
 		}
 	}
 	return nil
 }
 
-var UnsupportedArchErr = errors.New("unsupported architecture - only linux/amd64 is supported")
+func findExecutable(path string, pid int) string {
-
-func (dbp *Process) findExecutable(path string) (*elf.File, string, error) {
 	if path == "" {
-		path = fmt.Sprintf("/proc/%d/exe", dbp.Pid)
+		path = fmt.Sprintf("/proc/%d/exe", pid)
-	}
-	f, err := os.OpenFile(path, 0, os.ModePerm)
-	if err != nil {
-		return nil, path, err
-	}
-	elfFile, err := elf.NewFile(f)
-	if err != nil {
-		return nil, path, err
-	}
-	if elfFile.Machine != elf.EM_X86_64 {
-		return nil, path, UnsupportedArchErr
-	}
-	dbp.dwarf, err = elfFile.DWARF()
-	if err != nil {
-		return nil, path, err
-	}
-	return elfFile, path, nil
-}
-
-func (dbp *Process) parseDebugFrame(exe *elf.File, wg *sync.WaitGroup) {
-	defer wg.Done()
-
-	debugFrameSec := exe.Section(".debug_frame")
-	debugInfoSec := exe.Section(".debug_info")
-
-	if debugFrameSec != nil && debugInfoSec != nil {
-		debugFrame, err := exe.Section(".debug_frame").Data()
-		if err != nil {
-			fmt.Println("could not get .debug_frame section", err)
-			os.Exit(1)
-		}
-		dat, err := debugInfoSec.Data()
-		if err != nil {
-			fmt.Println("could not get .debug_info section", err)
-			os.Exit(1)
-		}
-		dbp.frameEntries = frame.Parse(debugFrame, frame.DwarfEndian(dat))
-	} else {
-		fmt.Println("could not find .debug_frame section in binary")
-		os.Exit(1)
-	}
-}
-
-func (dbp *Process) obtainGoSymbols(exe *elf.File, wg *sync.WaitGroup) {
-	defer wg.Done()
-
-	var (
-		symdat  []byte
-		pclndat []byte
-		err     error
-	)
-
-	if sec := exe.Section(".gosymtab"); sec != nil {
-		symdat, err = sec.Data()
-		if err != nil {
-			fmt.Println("could not get .gosymtab section", err)
-			os.Exit(1)
-		}
-	}
-
-	if sec := exe.Section(".gopclntab"); sec != nil {
-		pclndat, err = sec.Data()
-		if err != nil {
-			fmt.Println("could not get .gopclntab section", err)
-			os.Exit(1)
-		}
-	}
-
-	pcln := gosym.NewLineTable(pclndat, exe.Section(".text").Addr)
-	tab, err := gosym.NewTable(symdat, pcln)
-	if err != nil {
-		fmt.Println("could not get initialize line table", err)
-		os.Exit(1)
-	}
-
-	dbp.goSymTable = tab
-}
-
-func (dbp *Process) parseDebugLineInfo(exe *elf.File, wg *sync.WaitGroup) {
-	defer wg.Done()
-
-	if sec := exe.Section(".debug_line"); sec != nil {
-		debugLine, err := exe.Section(".debug_line").Data()
-		if err != nil {
-			fmt.Println("could not get .debug_line section", err)
-			os.Exit(1)
-		}
-		dbp.lineInfo = line.Parse(debugLine)
-	} else {
-		fmt.Println("could not find .debug_line section in binary")
-		os.Exit(1)
 	}
+	return path
 }
 
 func (dbp *Process) trapWait(pid int) (*Thread, error) {
+	return dbp.trapWaitInternal(pid, false)
+}
+
+func (dbp *Process) trapWaitInternal(pid int, halt bool) (*Thread, error) {
 	for {
 		wpid, status, err := dbp.wait(pid, 0)
 		if err != nil {
@@ -279,16 +222,16 @@ func (dbp *Process) trapWait(pid int) (*Thread, error) {
 		if wpid == 0 {
 			continue
 		}
-		th, ok := dbp.Threads[wpid]
+		th, ok := dbp.threads[wpid]
 		if ok {
 			th.Status = (*WaitStatus)(status)
 		}
 		if status.Exited() {
-			if wpid == dbp.Pid {
+			if wpid == dbp.pid {
 				dbp.postExit()
-				return nil, ProcessExitedError{Pid: wpid, Status: status.ExitStatus()}
+				return nil, proc.ErrProcessExited{Pid: wpid, Status: status.ExitStatus()}
 			}
-			delete(dbp.Threads, wpid)
+			delete(dbp.threads, wpid)
 			continue
 		}
 		if status.StopSignal() == sys.SIGTRAP && status.TrapCause() == sys.PTRACE_EVENT_CLONE {
@@ -307,19 +250,25 @@ func (dbp *Process) trapWait(pid int) (*Thread, error) {
 			if err != nil {
 				if err == sys.ESRCH {
 					// thread died while we were adding it
+					delete(dbp.threads, int(cloned))
 					continue
 				}
 				return nil, err
 			}
+			if halt {
+				th.os.running = false
+				dbp.threads[int(wpid)].os.running = false
+				return nil, nil
+			}
 			if err = th.Continue(); err != nil {
 				if err == sys.ESRCH {
 					// thread died while we were adding it
-					delete(dbp.Threads, th.ID)
+					delete(dbp.threads, th.ID)
 					continue
 				}
 				return nil, fmt.Errorf("could not continue new thread %d %s", cloned, err)
 			}
-			if err = dbp.Threads[int(wpid)].Continue(); err != nil {
+			if err = dbp.threads[int(wpid)].Continue(); err != nil {
 				if err != sys.ESRCH {
 					return nil, fmt.Errorf("could not continue existing thread %d %s", wpid, err)
 				}
@@ -330,20 +279,15 @@ func (dbp *Process) trapWait(pid int) (*Thread, error) {
 			// Sometimes we get an unknown thread, ignore it?
 			continue
 		}
-		if status.StopSignal() == sys.SIGTRAP && dbp.halt {
+		if (halt && status.StopSignal() == sys.SIGSTOP) || (status.StopSignal() == sys.SIGTRAP) {
-			th.running = false
+			th.os.running = false
-			dbp.halt = false
-			return th, nil
-		}
-		if status.StopSignal() == sys.SIGTRAP {
-			th.running = false
 			return th, nil
 		}
 		if th != nil {
 			// TODO(dp) alert user about unexpected signals here.
 			if err := th.resumeWithSig(int(status.StopSignal())); err != nil {
 				if err == sys.ESRCH {
-					return nil, ProcessExitedError{Pid: dbp.Pid}
+					return nil, proc.ErrProcessExited{Pid: dbp.pid}
 				}
 				return nil, err
 			}
@@ -354,19 +298,19 @@ func (dbp *Process) trapWait(pid int) (*Thread, error) {
 func (dbp *Process) loadProcessInformation(wg *sync.WaitGroup) {
 	defer wg.Done()
 
-	comm, err := ioutil.ReadFile(fmt.Sprintf("/proc/%d/comm", dbp.Pid))
+	comm, err := ioutil.ReadFile(fmt.Sprintf("/proc/%d/comm", dbp.pid))
 	if err == nil {
 		// removes newline character
 		comm = bytes.TrimSuffix(comm, []byte("\n"))
 	}
 
 	if comm == nil || len(comm) <= 0 {
-		stat, err := ioutil.ReadFile(fmt.Sprintf("/proc/%d/stat", dbp.Pid))
+		stat, err := ioutil.ReadFile(fmt.Sprintf("/proc/%d/stat", dbp.pid))
 		if err != nil {
 			fmt.Printf("Could not read proc stat: %v\n", err)
 			os.Exit(1)
 		}
-		expr := fmt.Sprintf("%d\\s*\\((.*)\\)", dbp.Pid)
+		expr := fmt.Sprintf("%d\\s*\\((.*)\\)", dbp.pid)
 		rexp, err := regexp.Compile(expr)
 		if err != nil {
 			fmt.Printf("Regexp compile error: %v\n", err)
@@ -374,7 +318,7 @@ func (dbp *Process) loadProcessInformation(wg *sync.WaitGroup) {
 		}
 		match := rexp.FindSubmatch(stat)
 		if match == nil {
-			fmt.Printf("No match found using regexp '%s' in /proc/%d/stat\n", expr, dbp.Pid)
+			fmt.Printf("No match found using regexp '%s' in /proc/%d/stat\n", expr, dbp.pid)
 			os.Exit(1)
 		}
 		comm = match[1]
@@ -402,9 +346,16 @@ func status(pid int, comm string) rune {
 	return state
 }
 
+// waitFast is like wait but does not handle process-exit correctly
+func (dbp *Process) waitFast(pid int) (int, *sys.WaitStatus, error) {
+	var s sys.WaitStatus
+	wpid, err := sys.Wait4(pid, &s, sys.WALL, nil)
+	return wpid, &s, err
+}
+
 func (dbp *Process) wait(pid, options int) (int, *sys.WaitStatus, error) {
 	var s sys.WaitStatus
-	if (pid != dbp.Pid) || (options != 0) {
+	if (pid != dbp.pid) || (options != 0) {
 		wpid, err := sys.Wait4(pid, &s, sys.WALL|options, nil)
 		return wpid, &s, err
 	}
@@ -434,24 +385,12 @@ func (dbp *Process) wait(pid, options int) (int, *sys.WaitStatus, error) {
 	}
 }
 
-func (dbp *Process) setCurrentBreakpoints(trapthread *Thread) error {
-	for _, th := range dbp.Threads {
-		if th.CurrentBreakpoint == nil {
-			err := th.SetCurrentBreakpoint()
-			if err != nil {
-				return err
-			}
-		}
-	}
-	return nil
-}
-
 func (dbp *Process) exitGuard(err error) error {
 	if err != sys.ESRCH {
 		return err
 	}
-	if status(dbp.Pid, dbp.os.comm) == StatusZombie {
+	if status(dbp.pid, dbp.os.comm) == StatusZombie {
-		_, err := dbp.trapWait(-1)
+		_, err := dbp.trapWaitInternal(-1, false)
 		return err
 	}
 
@@ -460,16 +399,16 @@ func (dbp *Process) exitGuard(err error) error {
 
 func (dbp *Process) resume() error {
 	// all threads stopped over a breakpoint are made to step over it
-	for _, thread := range dbp.Threads {
+	for _, thread := range dbp.threads {
-		if thread.CurrentBreakpoint != nil {
+		if thread.CurrentBreakpoint.Breakpoint != nil {
 			if err := thread.StepInstruction(); err != nil {
 				return err
 			}
-			thread.CurrentBreakpoint = nil
+			thread.CurrentBreakpoint.Clear()
 		}
 	}
 	// everything is resumed
-	for _, thread := range dbp.Threads {
+	for _, thread := range dbp.threads {
 		if err := thread.resume(); err != nil && err != sys.ESRCH {
 			return err
 		}
@@ -477,6 +416,78 @@ func (dbp *Process) resume() error {
 	return nil
 }
 
+// stop stops all running threads threads and sets breakpoints
+func (dbp *Process) stop(trapthread *Thread) (err error) {
+	if dbp.exited {
+		return &proc.ErrProcessExited{Pid: dbp.Pid()}
+	}
+	for _, th := range dbp.threads {
+		if !th.Stopped() {
+			if err := th.stop(); err != nil {
+				return dbp.exitGuard(err)
+			}
+		}
+	}
+
+	// wait for all threads to stop
+	for {
+		allstopped := true
+		for _, th := range dbp.threads {
+			if th.os.running {
+				allstopped = false
+				break
+			}
+		}
+		if allstopped {
+			break
+		}
+		_, err := dbp.trapWaitInternal(-1, true)
+		if err != nil {
+			return err
+		}
+	}
+
+	// set breakpoints on all threads
+	for _, th := range dbp.threads {
+		if th.CurrentBreakpoint.Breakpoint == nil {
+			if err := th.SetCurrentBreakpoint(); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+func (dbp *Process) detach(kill bool) error {
+	for threadID := range dbp.threads {
+		err := PtraceDetach(threadID, 0)
+		if err != nil {
+			return err
+		}
+	}
+	if kill {
+		return nil
+	}
+	// For some reason the process will sometimes enter stopped state after a
+	// detach, this doesn't happen immediately either.
+	// We have to wait a bit here, then check if the main thread is stopped and
+	// SIGCONT it if it is.
+	time.Sleep(50 * time.Millisecond)
+	if s := status(dbp.pid, dbp.os.comm); s == 'T' {
+		sys.Kill(dbp.pid, sys.SIGCONT)
+	}
+	return nil
+}
+
+func (dbp *Process) entryPoint() (uint64, error) {
+	auxvbuf, err := ioutil.ReadFile(fmt.Sprintf("/proc/%d/auxv", dbp.pid))
+	if err != nil {
+		return 0, fmt.Errorf("could not read auxiliary vector: %v", err)
+	}
+
+	return linutil.EntryPointFromAuxvAMD64(auxvbuf), nil
+}
+
 func killProcess(pid int) error {
 	return sys.Kill(pid, sys.SIGINT)
 }

vendor/github.com/derekparker/delve/pkg/proc/native/proc_windows.go

@@ -0,0 +1,497 @@
+package native
+
+import (
+	"debug/pe"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"sync"
+	"syscall"
+	"unsafe"
+
+	sys "golang.org/x/sys/windows"
+
+	"github.com/derekparker/delve/pkg/proc"
+)
+
+// OSProcessDetails holds Windows specific information.
+type OSProcessDetails struct {
+	hProcess    syscall.Handle
+	breakThread int
+	entryPoint  uint64
+}
+
+func openExecutablePathPE(path string) (*pe.File, io.Closer, error) {
+	f, err := os.OpenFile(path, 0, os.ModePerm)
+	if err != nil {
+		return nil, nil, err
+	}
+	peFile, err := pe.NewFile(f)
+	if err != nil {
+		f.Close()
+		return nil, nil, err
+	}
+	return peFile, f, nil
+}
+
+// Launch creates and begins debugging a new process.
+func Launch(cmd []string, wd string, foreground bool) (*Process, error) {
+	argv0Go, err := filepath.Abs(cmd[0])
+	if err != nil {
+		return nil, err
+	}
+
+	// Make sure the binary exists and is an executable file
+	if filepath.Base(cmd[0]) == cmd[0] {
+		if _, err := exec.LookPath(cmd[0]); err != nil {
+			return nil, err
+		}
+	}
+
+	_, closer, err := openExecutablePathPE(argv0Go)
+	if err != nil {
+		return nil, proc.ErrNotExecutable
+	}
+	closer.Close()
+
+	var p *os.Process
+	dbp := New(0)
+	dbp.common = proc.NewCommonProcess(true)
+	dbp.execPtraceFunc(func() {
+		attr := &os.ProcAttr{
+			Dir:   wd,
+			Files: []*os.File{os.Stdin, os.Stdout, os.Stderr},
+			Sys: &syscall.SysProcAttr{
+				CreationFlags: _DEBUG_ONLY_THIS_PROCESS,
+			},
+		}
+		p, err = os.StartProcess(argv0Go, cmd, attr)
+	})
+	if err != nil {
+		return nil, err
+	}
+	defer p.Release()
+
+	dbp.pid = p.Pid
+	dbp.childProcess = true
+
+	return newDebugProcess(dbp, argv0Go)
+}
+
+// newDebugProcess prepares process pid for debugging.
+func newDebugProcess(dbp *Process, exepath string) (*Process, error) {
+	// It should not actually be possible for the
+	// call to waitForDebugEvent to fail, since Windows
+	// will always fire a CREATE_PROCESS_DEBUG_EVENT event
+	// immediately after launching under DEBUG_ONLY_THIS_PROCESS.
+	// Attaching with DebugActiveProcess has similar effect.
+	var err error
+	var tid, exitCode int
+	dbp.execPtraceFunc(func() {
+		tid, exitCode, err = dbp.waitForDebugEvent(waitBlocking)
+	})
+	if err != nil {
+		return nil, err
+	}
+	if tid == 0 {
+		dbp.postExit()
+		return nil, proc.ErrProcessExited{Pid: dbp.pid, Status: exitCode}
+	}
+	// Suspend all threads so that the call to _ContinueDebugEvent will
+	// not resume the target.
+	for _, thread := range dbp.threads {
+		_, err := _SuspendThread(thread.os.hThread)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	dbp.execPtraceFunc(func() {
+		err = _ContinueDebugEvent(uint32(dbp.pid), uint32(dbp.os.breakThread), _DBG_CONTINUE)
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	return initializeDebugProcess(dbp, exepath)
+}
+
+// findExePath searches for process pid, and returns its executable path.
+func findExePath(pid int) (string, error) {
+	// Original code suggested different approach (see below).
+	// Maybe it could be useful in the future.
+	//
+	// Find executable path from PID/handle on Windows:
+	// https://msdn.microsoft.com/en-us/library/aa366789(VS.85).aspx
+
+	p, err := syscall.OpenProcess(syscall.PROCESS_QUERY_INFORMATION, false, uint32(pid))
+	if err != nil {
+		return "", err
+	}
+	defer syscall.CloseHandle(p)
+
+	n := uint32(128)
+	for {
+		buf := make([]uint16, int(n))
+		err = _QueryFullProcessImageName(p, 0, &buf[0], &n)
+		switch err {
+		case syscall.ERROR_INSUFFICIENT_BUFFER:
+			// try bigger buffer
+			n *= 2
+			// but stop if it gets too big
+			if n > 10000 {
+				return "", err
+			}
+		case nil:
+			return syscall.UTF16ToString(buf[:n]), nil
+		default:
+			return "", err
+		}
+	}
+}
+
+// Attach to an existing process with the given PID.
+func Attach(pid int) (*Process, error) {
+	// TODO: Probably should have SeDebugPrivilege before starting here.
+	err := _DebugActiveProcess(uint32(pid))
+	if err != nil {
+		return nil, err
+	}
+	exepath, err := findExePath(pid)
+	if err != nil {
+		return nil, err
+	}
+	dbp, err := newDebugProcess(New(pid), exepath)
+	if err != nil {
+		if dbp != nil {
+			dbp.Detach(false)
+		}
+		return nil, err
+	}
+	return dbp, nil
+}
+
+// kill kills the process.
+func (dbp *Process) kill() error {
+	if dbp.exited {
+		return nil
+	}
+
+	p, err := os.FindProcess(dbp.pid)
+	if err != nil {
+		return err
+	}
+	defer p.Release()
+
+	// TODO: Should not have to ignore failures here,
+	// but some tests appear to Kill twice causing
+	// this to fail on second attempt.
+	_ = syscall.TerminateProcess(dbp.os.hProcess, 1)
+
+	dbp.execPtraceFunc(func() {
+		dbp.waitForDebugEvent(waitBlocking | waitDontHandleExceptions)
+	})
+
+	p.Wait()
+
+	dbp.postExit()
+	return nil
+}
+
+func (dbp *Process) requestManualStop() error {
+	return _DebugBreakProcess(dbp.os.hProcess)
+}
+
+func (dbp *Process) updateThreadList() error {
+	// We ignore this request since threads are being
+	// tracked as they are created/killed in waitForDebugEvent.
+	return nil
+}
+
+func (dbp *Process) addThread(hThread syscall.Handle, threadID int, attach, suspendNewThreads bool) (*Thread, error) {
+	if thread, ok := dbp.threads[threadID]; ok {
+		return thread, nil
+	}
+	thread := &Thread{
+		ID:  threadID,
+		dbp: dbp,
+		os:  new(OSSpecificDetails),
+	}
+	thread.os.hThread = hThread
+	dbp.threads[threadID] = thread
+	if dbp.currentThread == nil {
+		dbp.SwitchThread(thread.ID)
+	}
+	if suspendNewThreads {
+		_, err := _SuspendThread(thread.os.hThread)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return thread, nil
+}
+
+func findExecutable(path string, pid int) string {
+	return path
+}
+
+type waitForDebugEventFlags int
+
+const (
+	waitBlocking waitForDebugEventFlags = 1 << iota
+	waitSuspendNewThreads
+	waitDontHandleExceptions
+)
+
+func (dbp *Process) waitForDebugEvent(flags waitForDebugEventFlags) (threadID, exitCode int, err error) {
+	var debugEvent _DEBUG_EVENT
+	shouldExit := false
+	for {
+		continueStatus := uint32(_DBG_CONTINUE)
+		var milliseconds uint32 = 0
+		if flags&waitBlocking != 0 {
+			milliseconds = syscall.INFINITE
+		}
+		// Wait for a debug event...
+		err := _WaitForDebugEvent(&debugEvent, milliseconds)
+		if err != nil {
+			return 0, 0, err
+		}
+
+		// ... handle each event kind ...
+		unionPtr := unsafe.Pointer(&debugEvent.U[0])
+		switch debugEvent.DebugEventCode {
+		case _CREATE_PROCESS_DEBUG_EVENT:
+			debugInfo := (*_CREATE_PROCESS_DEBUG_INFO)(unionPtr)
+			hFile := debugInfo.File
+			if hFile != 0 && hFile != syscall.InvalidHandle {
+				err = syscall.CloseHandle(hFile)
+				if err != nil {
+					return 0, 0, err
+				}
+			}
+			dbp.os.entryPoint = uint64(debugInfo.BaseOfImage)
+			dbp.os.hProcess = debugInfo.Process
+			_, err = dbp.addThread(debugInfo.Thread, int(debugEvent.ThreadId), false, flags&waitSuspendNewThreads != 0)
+			if err != nil {
+				return 0, 0, err
+			}
+			break
+		case _CREATE_THREAD_DEBUG_EVENT:
+			debugInfo := (*_CREATE_THREAD_DEBUG_INFO)(unionPtr)
+			_, err = dbp.addThread(debugInfo.Thread, int(debugEvent.ThreadId), false, flags&waitSuspendNewThreads != 0)
+			if err != nil {
+				return 0, 0, err
+			}
+			break
+		case _EXIT_THREAD_DEBUG_EVENT:
+			delete(dbp.threads, int(debugEvent.ThreadId))
+			break
+		case _OUTPUT_DEBUG_STRING_EVENT:
+			//TODO: Handle debug output strings
+			break
+		case _LOAD_DLL_DEBUG_EVENT:
+			debugInfo := (*_LOAD_DLL_DEBUG_INFO)(unionPtr)
+			hFile := debugInfo.File
+			if hFile != 0 && hFile != syscall.InvalidHandle {
+				err = syscall.CloseHandle(hFile)
+				if err != nil {
+					return 0, 0, err
+				}
+			}
+			break
+		case _UNLOAD_DLL_DEBUG_EVENT:
+			break
+		case _RIP_EVENT:
+			break
+		case _EXCEPTION_DEBUG_EVENT:
+			if flags&waitDontHandleExceptions != 0 {
+				continueStatus = _DBG_EXCEPTION_NOT_HANDLED
+				break
+			}
+			exception := (*_EXCEPTION_DEBUG_INFO)(unionPtr)
+			tid := int(debugEvent.ThreadId)
+
+			switch code := exception.ExceptionRecord.ExceptionCode; code {
+			case _EXCEPTION_BREAKPOINT:
+
+				// check if the exception address really is a breakpoint instruction, if
+				// it isn't we already removed that breakpoint and we can't deal with
+				// this exception anymore.
+				atbp := true
+				if thread, found := dbp.threads[tid]; found {
+					data := make([]byte, dbp.bi.Arch.BreakpointSize())
+					if _, err := thread.ReadMemory(data, exception.ExceptionRecord.ExceptionAddress); err == nil {
+						instr := dbp.bi.Arch.BreakpointInstruction()
+						for i := range instr {
+							if data[i] != instr[i] {
+								atbp = false
+								break
+							}
+						}
+					}
+					if !atbp {
+						thread.SetPC(uint64(exception.ExceptionRecord.ExceptionAddress))
+					}
+				}
+
+				if atbp {
+					dbp.os.breakThread = tid
+					return tid, 0, nil
+				} else {
+					continueStatus = _DBG_CONTINUE
+				}
+			case _EXCEPTION_SINGLE_STEP:
+				dbp.os.breakThread = tid
+				return tid, 0, nil
+			default:
+				continueStatus = _DBG_EXCEPTION_NOT_HANDLED
+			}
+		case _EXIT_PROCESS_DEBUG_EVENT:
+			debugInfo := (*_EXIT_PROCESS_DEBUG_INFO)(unionPtr)
+			exitCode = int(debugInfo.ExitCode)
+			shouldExit = true
+		default:
+			return 0, 0, fmt.Errorf("unknown debug event code: %d", debugEvent.DebugEventCode)
+		}
+
+		// .. and then continue unless we received an event that indicated we should break into debugger.
+		err = _ContinueDebugEvent(debugEvent.ProcessId, debugEvent.ThreadId, continueStatus)
+		if err != nil {
+			return 0, 0, err
+		}
+
+		if shouldExit {
+			return 0, exitCode, nil
+		}
+	}
+}
+
+func (dbp *Process) trapWait(pid int) (*Thread, error) {
+	var err error
+	var tid, exitCode int
+	dbp.execPtraceFunc(func() {
+		tid, exitCode, err = dbp.waitForDebugEvent(waitBlocking)
+	})
+	if err != nil {
+		return nil, err
+	}
+	if tid == 0 {
+		dbp.postExit()
+		return nil, proc.ErrProcessExited{Pid: dbp.pid, Status: exitCode}
+	}
+	th := dbp.threads[tid]
+	return th, nil
+}
+
+func (dbp *Process) loadProcessInformation(wg *sync.WaitGroup) {
+	wg.Done()
+}
+
+func (dbp *Process) wait(pid, options int) (int, *sys.WaitStatus, error) {
+	return 0, nil, fmt.Errorf("not implemented: wait")
+}
+
+func (dbp *Process) exitGuard(err error) error {
+	return err
+}
+
+func (dbp *Process) resume() error {
+	for _, thread := range dbp.threads {
+		if thread.CurrentBreakpoint.Breakpoint != nil {
+			if err := thread.StepInstruction(); err != nil {
+				return err
+			}
+			thread.CurrentBreakpoint.Clear()
+		}
+	}
+
+	for _, thread := range dbp.threads {
+		_, err := _ResumeThread(thread.os.hThread)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// stop stops all running threads threads and sets breakpoints
+func (dbp *Process) stop(trapthread *Thread) (err error) {
+	if dbp.exited {
+		return &proc.ErrProcessExited{Pid: dbp.Pid()}
+	}
+
+	// While the debug event that stopped the target was being propagated
+	// other target threads could generate other debug events.
+	// After this function we need to know about all the threads
+	// stopped on a breakpoint. To do that we first suspend all target
+	// threads and then repeatedly call _ContinueDebugEvent followed by
+	// waitForDebugEvent in non-blocking mode.
+	// We need to explicitly call SuspendThread because otherwise the
+	// call to _ContinueDebugEvent will resume execution of some of the
+	// target threads.
+
+	err = trapthread.SetCurrentBreakpoint()
+	if err != nil {
+		return err
+	}
+
+	for _, thread := range dbp.threads {
+		_, err := _SuspendThread(thread.os.hThread)
+		if err != nil {
+			return err
+		}
+	}
+
+	for {
+		var err error
+		var tid int
+		dbp.execPtraceFunc(func() {
+			err = _ContinueDebugEvent(uint32(dbp.pid), uint32(dbp.os.breakThread), _DBG_CONTINUE)
+			if err == nil {
+				tid, _, _ = dbp.waitForDebugEvent(waitSuspendNewThreads)
+			}
+		})
+		if err != nil {
+			return err
+		}
+		if tid == 0 {
+			break
+		}
+		err = dbp.threads[tid].SetCurrentBreakpoint()
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (dbp *Process) detach(kill bool) error {
+	if !kill {
+		for _, thread := range dbp.threads {
+			_, err := _ResumeThread(thread.os.hThread)
+			if err != nil {
+				return err
+			}
+		}
+	}
+	return _DebugActiveProcessStop(uint32(dbp.pid))
+}
+
+func (dbp *Process) entryPoint() (uint64, error) {
+	return dbp.os.entryPoint, nil
+}
+
+func killProcess(pid int) error {
+	p, err := os.FindProcess(pid)
+	if err != nil {
+		return err
+	}
+	defer p.Release()
+
+	return p.Kill()
+}

vendor/github.com/derekparker/delve/pkg/proc/native/ptrace_darwin.go

@@ -1,4 +1,6 @@
-package proc
+//+build darwin,macnative
+
+package native
 
 import sys "golang.org/x/sys/unix"
 

vendor/github.com/derekparker/delve/pkg/proc/native/ptrace_linux.go

@@ -1,11 +1,12 @@
-package proc
+package native
 
 import (
-	"encoding/binary"
 	"syscall"
 	"unsafe"
 
 	sys "golang.org/x/sys/unix"
+
+	"github.com/derekparker/delve/pkg/proc"
 )
 
 // PtraceAttach executes the sys.PtraceAttach call.
@@ -56,9 +57,10 @@ func PtracePeekUser(tid int, off uintptr) (uintptr, error) {
 // See amd64_linux_fetch_inferior_registers in gdb/amd64-linux-nat.c.html
 // and amd64_supply_xsave in gdb/amd64-tdep.c.html
 // and Section 13.1 (and following) of Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 1: Basic Architecture
-func PtraceGetRegset(tid int) (regset PtraceXsave, err error) {
+func PtraceGetRegset(tid int) (regset proc.LinuxX86Xstate, err error) {
 	_, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_GETFPREGS, uintptr(tid), uintptr(0), uintptr(unsafe.Pointer(&regset.PtraceFpRegs)), 0, 0)
-	if err == syscall.Errno(0) {
+	if err == syscall.Errno(0) || err == syscall.ENODEV {
+		// ignore ENODEV, it just means this CPU doesn't have X87 registers (??)
 		err = nil
 	}
 
@@ -66,31 +68,16 @@ func PtraceGetRegset(tid int) (regset PtraceXsave, err error) {
 	iov := sys.Iovec{Base: &xstateargs[0], Len: _X86_XSTATE_MAX_SIZE}
 	_, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_GETREGSET, uintptr(tid), _NT_X86_XSTATE, uintptr(unsafe.Pointer(&iov)), 0, 0)
 	if err != syscall.Errno(0) {
+		if err == syscall.ENODEV {
+			// ignore ENODEV, it just means this CPU or kernel doesn't support XSTATE, see https://github.com/derekparker/delve/issues/1022
+			err = nil
+		}
 		return
 	} else {
 		err = nil
 	}
 
-	if _XSAVE_HEADER_START+_XSAVE_HEADER_LEN >= iov.Len {
+	regset.Xsave = xstateargs[:iov.Len]
-		return
+	err = proc.LinuxX86XstateRead(regset.Xsave, false, &regset)
-	}
+	return regset, err
-	xsaveheader := xstateargs[_XSAVE_HEADER_START : _XSAVE_HEADER_START+_XSAVE_HEADER_LEN]
-	xstate_bv := binary.LittleEndian.Uint64(xsaveheader[0:8])
-	xcomp_bv := binary.LittleEndian.Uint64(xsaveheader[8:16])
-
-	if xcomp_bv&(1<<63) != 0 {
-		// compact format not supported
-		return
-	}
-
-	if xstate_bv&(1<<2) == 0 {
-		// AVX state not present
-		return
-	}
-
-	avxstate := xstateargs[_XSAVE_EXTENDED_REGION_START:iov.Len]
-	regset.AvxState = true
-	copy(regset.YmmSpace[:], avxstate[:len(regset.YmmSpace)])
-
-	return
 }

vendor/github.com/derekparker/delve/pkg/proc/native/registers_darwin_amd64.go

@@ -1,12 +1,18 @@
-package proc
+//+build darwin,macnative
+
+package native
 
 // #include "threads_darwin.h"
 import "C"
 import (
 	"encoding/binary"
+	"errors"
 	"fmt"
-	"rsc.io/x86/x86asm"
 	"unsafe"
+
+	"golang.org/x/arch/x86/x86asm"
+
+	"github.com/derekparker/delve/pkg/proc"
 )
 
 // Regs represents CPU registers on an AMD64 processor.
@@ -33,10 +39,10 @@ type Regs struct {
 	fs     uint64
 	gs     uint64
 	gsBase uint64
-	fpregs []Register
+	fpregs []proc.Register
 }
 
-func (r *Regs) Slice() []Register {
+func (r *Regs) Slice() []proc.Register {
 	var regs = []struct {
 		k string
 		v uint64
@@ -64,12 +70,12 @@ func (r *Regs) Slice() []Register {
 		{"Gs", r.gs},
 		{"Gs_base", r.gsBase},
 	}
-	out := make([]Register, 0, len(regs)+len(r.fpregs))
+	out := make([]proc.Register, 0, len(regs)+len(r.fpregs))
 	for _, reg := range regs {
 		if reg.k == "Rflags" {
-			out = appendFlagReg(out, reg.k, reg.v, eflagsDescription, 64)
+			out = proc.AppendEflagReg(out, reg.k, reg.v)
 		} else {
-			out = appendQwordReg(out, reg.k, reg.v)
+			out = proc.AppendQwordReg(out, reg.k, reg.v)
 		}
 	}
 	out = append(out, r.fpregs...)
@@ -88,6 +94,10 @@ func (r *Regs) SP() uint64 {
 	return r.rsp
 }
 
+func (r *Regs) BP() uint64 {
+	return r.rbp
+}
+
 // CX returns the value of the RCX register.
 func (r *Regs) CX() uint64 {
 	return r.rcx
@@ -100,8 +110,12 @@ func (r *Regs) TLS() uint64 {
 	return r.gsBase
 }
 
+func (r *Regs) GAddr() (uint64, bool) {
+	return 0, false
+}
+
 // SetPC sets the RIP register to the value specified by `pc`.
-func (r *Regs) SetPC(thread *Thread, pc uint64) error {
+func (thread *Thread) SetPC(pc uint64) error {
 	kret := C.set_pc(thread.os.threadAct, C.uint64_t(pc))
 	if kret != C.KERN_SUCCESS {
 		return fmt.Errorf("could not set pc")
@@ -109,6 +123,15 @@ func (r *Regs) SetPC(thread *Thread, pc uint64) error {
 	return nil
 }
 
+// SetSP sets the RSP register to the value specified by `pc`.
+func (thread *Thread) SetSP(sp uint64) error {
+	return errors.New("not implemented")
+}
+
+func (thread *Thread) SetDX(dx uint64) error {
+	return errors.New("not implemented")
+}
+
 func (r *Regs) Get(n int) (uint64, error) {
 	reg := x86asm.Reg(n)
 	const (
@@ -130,7 +153,7 @@ func (r *Regs) Get(n int) (uint64, error) {
 	case x86asm.AH:
 		return (r.rax >> 8) & mask8, nil
 	case x86asm.CH:
-		return (r.rax >> 8) & mask8, nil
+		return (r.rcx >> 8) & mask8, nil
 	case x86asm.DH:
 		return (r.rdx >> 8) & mask8, nil
 	case x86asm.BH:
@@ -263,10 +286,10 @@ func (r *Regs) Get(n int) (uint64, error) {
 		return r.r15, nil
 	}
 
-	return 0, UnknownRegisterError
+	return 0, proc.ErrUnknownRegister
 }
 
-func registers(thread *Thread, floatingPoint bool) (Registers, error) {
+func registers(thread *Thread, floatingPoint bool) (proc.Registers, error) {
 	var state C.x86_thread_state64_t
 	var identity C.thread_identifier_info_data_t
 	kret := C.get_registers(C.mach_port_name_t(thread.os.threadAct), &state)
@@ -322,42 +345,31 @@ func registers(thread *Thread, floatingPoint bool) (Registers, error) {
 			return nil, fmt.Errorf("could not get floating point registers")
 		}
 
-		regs.fpregs = appendWordReg(regs.fpregs, "CW", *((*uint16)(unsafe.Pointer(&fpstate.__fpu_fcw))))
+		regs.fpregs = proc.AppendWordReg(regs.fpregs, "CW", *((*uint16)(unsafe.Pointer(&fpstate.__fpu_fcw))))
-		regs.fpregs = appendWordReg(regs.fpregs, "SW", *((*uint16)(unsafe.Pointer(&fpstate.__fpu_fsw))))
+		regs.fpregs = proc.AppendWordReg(regs.fpregs, "SW", *((*uint16)(unsafe.Pointer(&fpstate.__fpu_fsw))))
-		regs.fpregs = appendWordReg(regs.fpregs, "TW", uint16(fpstate.__fpu_ftw))
+		regs.fpregs = proc.AppendWordReg(regs.fpregs, "TW", uint16(fpstate.__fpu_ftw))
-		regs.fpregs = appendWordReg(regs.fpregs, "FOP", uint16(fpstate.__fpu_fop))
+		regs.fpregs = proc.AppendWordReg(regs.fpregs, "FOP", uint16(fpstate.__fpu_fop))
-		regs.fpregs = appendQwordReg(regs.fpregs, "FIP", uint64(fpstate.__fpu_cs)<<32|uint64(fpstate.__fpu_ip))
+		regs.fpregs = proc.AppendQwordReg(regs.fpregs, "FIP", uint64(fpstate.__fpu_cs)<<32|uint64(fpstate.__fpu_ip))
-		regs.fpregs = appendQwordReg(regs.fpregs, "FDP", uint64(fpstate.__fpu_ds)<<32|uint64(fpstate.__fpu_dp))
+		regs.fpregs = proc.AppendQwordReg(regs.fpregs, "FDP", uint64(fpstate.__fpu_ds)<<32|uint64(fpstate.__fpu_dp))
 
 		for i, st := range []*C.char{&fpstate.__fpu_stmm0.__mmst_reg[0], &fpstate.__fpu_stmm1.__mmst_reg[0], &fpstate.__fpu_stmm2.__mmst_reg[0], &fpstate.__fpu_stmm3.__mmst_reg[0], &fpstate.__fpu_stmm4.__mmst_reg[0], &fpstate.__fpu_stmm5.__mmst_reg[0], &fpstate.__fpu_stmm6.__mmst_reg[0], &fpstate.__fpu_stmm7.__mmst_reg[0]} {
 			stb := C.GoBytes(unsafe.Pointer(st), 10)
 			mantissa := binary.LittleEndian.Uint64(stb[:8])
 			exponent := binary.LittleEndian.Uint16(stb[8:])
-			regs.fpregs = appendX87Reg(regs.fpregs, i, exponent, mantissa)
+			regs.fpregs = proc.AppendX87Reg(regs.fpregs, i, exponent, mantissa)
 		}
 
-		regs.fpregs = appendFlagReg(regs.fpregs, "MXCSR", uint64(fpstate.__fpu_mxcsr), mxcsrDescription, 32)
+		regs.fpregs = proc.AppendMxcsrReg(regs.fpregs, "MXCSR", uint64(fpstate.__fpu_mxcsr))
-		regs.fpregs = appendDwordReg(regs.fpregs, "MXCSR_MASK", uint32(fpstate.__fpu_mxcsrmask))
+		regs.fpregs = proc.AppendDwordReg(regs.fpregs, "MXCSR_MASK", uint32(fpstate.__fpu_mxcsrmask))
 
 		for i, xmm := range []*C.char{&fpstate.__fpu_xmm0.__xmm_reg[0], &fpstate.__fpu_xmm1.__xmm_reg[0], &fpstate.__fpu_xmm2.__xmm_reg[0], &fpstate.__fpu_xmm3.__xmm_reg[0], &fpstate.__fpu_xmm4.__xmm_reg[0], &fpstate.__fpu_xmm5.__xmm_reg[0], &fpstate.__fpu_xmm6.__xmm_reg[0], &fpstate.__fpu_xmm7.__xmm_reg[0], &fpstate.__fpu_xmm8.__xmm_reg[0], &fpstate.__fpu_xmm9.__xmm_reg[0], &fpstate.__fpu_xmm10.__xmm_reg[0], &fpstate.__fpu_xmm11.__xmm_reg[0], &fpstate.__fpu_xmm12.__xmm_reg[0], &fpstate.__fpu_xmm13.__xmm_reg[0], &fpstate.__fpu_xmm14.__xmm_reg[0], &fpstate.__fpu_xmm15.__xmm_reg[0]} {
-			regs.fpregs = appendSSEReg(regs.fpregs, fmt.Sprintf("XMM%d", i), C.GoBytes(unsafe.Pointer(xmm), 16))
+			regs.fpregs = proc.AppendSSEReg(regs.fpregs, fmt.Sprintf("XMM%d", i), C.GoBytes(unsafe.Pointer(xmm), 16))
 		}
 	}
 	return regs, nil
 }
 
-func (thread *Thread) saveRegisters() (Registers, error) {
+func (r *Regs) Copy() proc.Registers {
-	kret := C.get_registers(C.mach_port_name_t(thread.os.threadAct), &thread.os.registers)
+	//TODO(aarzilli): implement this to support function calls
-	if kret != C.KERN_SUCCESS {
-		return nil, fmt.Errorf("could not save register contents")
-	}
-	return &Regs{rip: uint64(thread.os.registers.__rip), rsp: uint64(thread.os.registers.__rsp)}, nil
-}
-
-func (thread *Thread) restoreRegisters() error {
-	kret := C.set_registers(C.mach_port_name_t(thread.os.threadAct), &thread.os.registers)
-	if kret != C.KERN_SUCCESS {
-		return fmt.Errorf("could not save register contents")
-	}
 	return nil
 }

vendor/github.com/derekparker/delve/pkg/proc/native/registers_linux_amd64.go

@@ -1,20 +1,22 @@
-package proc
+package native
 
 import (
 	"fmt"
 
-	"rsc.io/x86/x86asm"
+	"golang.org/x/arch/x86/x86asm"
-
 	sys "golang.org/x/sys/unix"
+
+	"github.com/derekparker/delve/pkg/proc"
 )
 
 // Regs is a wrapper for sys.PtraceRegs.
 type Regs struct {
-	regs   *sys.PtraceRegs
+	regs     *sys.PtraceRegs
-	fpregs []Register
+	fpregs   []proc.Register
+	fpregset *proc.LinuxX86Xstate
 }
 
-func (r *Regs) Slice() []Register {
+func (r *Regs) Slice() []proc.Register {
 	var regs = []struct {
 		k string
 		v uint64
@@ -47,12 +49,12 @@ func (r *Regs) Slice() []Register {
 		{"Fs", r.regs.Fs},
 		{"Gs", r.regs.Gs},
 	}
-	out := make([]Register, 0, len(regs)+len(r.fpregs))
+	out := make([]proc.Register, 0, len(regs)+len(r.fpregs))
 	for _, reg := range regs {
 		if reg.k == "Eflags" {
-			out = appendFlagReg(out, reg.k, reg.v, eflagsDescription, 64)
+			out = proc.AppendEflagReg(out, reg.k, reg.v)
 		} else {
-			out = appendQwordReg(out, reg.k, reg.v)
+			out = proc.AppendQwordReg(out, reg.k, reg.v)
 		}
 	}
 	out = append(out, r.fpregs...)
@@ -69,6 +71,10 @@ func (r *Regs) SP() uint64 {
 	return r.regs.Rsp
 }
 
+func (r *Regs) BP() uint64 {
+	return r.regs.Rbp
+}
+
 // CX returns the value of RCX register.
 func (r *Regs) CX() uint64 {
 	return r.regs.Rcx
@@ -80,10 +86,44 @@ func (r *Regs) TLS() uint64 {
 	return r.regs.Fs_base
 }
 
+func (r *Regs) GAddr() (uint64, bool) {
+	return 0, false
+}
+
 // SetPC sets RIP to the value specified by 'pc'.
-func (r *Regs) SetPC(thread *Thread, pc uint64) (err error) {
+func (thread *Thread) SetPC(pc uint64) error {
+	ir, err := registers(thread, false)
+	if err != nil {
+		return err
+	}
+	r := ir.(*Regs)
 	r.regs.SetPC(pc)
 	thread.dbp.execPtraceFunc(func() { err = sys.PtraceSetRegs(thread.ID, r.regs) })
+	return err
+}
+
+// SetSP sets RSP to the value specified by 'sp'
+func (thread *Thread) SetSP(sp uint64) (err error) {
+	var ir proc.Registers
+	ir, err = registers(thread, false)
+	if err != nil {
+		return err
+	}
+	r := ir.(*Regs)
+	r.regs.Rsp = sp
+	thread.dbp.execPtraceFunc(func() { err = sys.PtraceSetRegs(thread.ID, r.regs) })
+	return
+}
+
+func (thread *Thread) SetDX(dx uint64) (err error) {
+	var ir proc.Registers
+	ir, err = registers(thread, false)
+	if err != nil {
+		return err
+	}
+	r := ir.(*Regs)
+	r.regs.Rdx = dx
+	thread.dbp.execPtraceFunc(func() { err = sys.PtraceSetRegs(thread.ID, r.regs) })
 	return
 }
 
@@ -108,7 +148,7 @@ func (r *Regs) Get(n int) (uint64, error) {
 	case x86asm.AH:
 		return (r.regs.Rax >> 8) & mask8, nil
 	case x86asm.CH:
-		return (r.regs.Rax >> 8) & mask8, nil
+		return (r.regs.Rcx >> 8) & mask8, nil
 	case x86asm.DH:
 		return (r.regs.Rdx >> 8) & mask8, nil
 	case x86asm.BH:
@@ -241,10 +281,10 @@ func (r *Regs) Get(n int) (uint64, error) {
 		return r.regs.R15, nil
 	}
 
-	return 0, UnknownRegisterError
+	return 0, proc.ErrUnknownRegister
 }
 
-func registers(thread *Thread, floatingPoint bool) (Registers, error) {
+func registers(thread *Thread, floatingPoint bool) (proc.Registers, error) {
 	var (
 		regs sys.PtraceRegs
 		err  error
@@ -253,9 +293,11 @@ func registers(thread *Thread, floatingPoint bool) (Registers, error) {
 	if err != nil {
 		return nil, err
 	}
-	r := &Regs{&regs, nil}
+	r := &Regs{&regs, nil, nil}
 	if floatingPoint {
-		r.fpregs, err = thread.fpRegisters()
+		var fpregset proc.LinuxX86Xstate
+		r.fpregs, fpregset, err = thread.fpRegisters()
+		r.fpregset = &fpregset
 		if err != nil {
 			return nil, err
 		}
@@ -263,27 +305,6 @@ func registers(thread *Thread, floatingPoint bool) (Registers, error) {
 	return r, nil
 }
 
-// tracks user_fpregs_struct in /usr/include/x86_64-linux-gnu/sys/user.h
-type PtraceFpRegs struct {
-	Cwd      uint16
-	Swd      uint16
-	Ftw      uint16
-	Fop      uint16
-	Rip      uint64
-	Rdp      uint64
-	Mxcsr    uint32
-	MxcrMask uint32
-	StSpace  [32]uint32
-	XmmSpace [256]byte
-	padding  [24]uint32
-}
-
-type PtraceXsave struct {
-	PtraceFpRegs
-	AvxState bool // contains AVX state
-	YmmSpace [256]byte
-}
-
 const (
 	_X86_XSTATE_MAX_SIZE = 2688
 	_NT_X86_XSTATE       = 0x202
@@ -294,32 +315,28 @@ const (
 	_XSAVE_SSE_REGION_LEN        = 416
 )
 
-func (thread *Thread) fpRegisters() (regs []Register, err error) {
+func (thread *Thread) fpRegisters() (regs []proc.Register, fpregs proc.LinuxX86Xstate, err error) {
-	var fpregs PtraceXsave
 	thread.dbp.execPtraceFunc(func() { fpregs, err = PtraceGetRegset(thread.ID) })
-
+	regs = fpregs.Decode()
-	// x87 registers
+	if err != nil {
-	regs = appendWordReg(regs, "CW", fpregs.Cwd)
+		err = fmt.Errorf("could not get floating point registers: %v", err.Error())
-	regs = appendWordReg(regs, "SW", fpregs.Swd)
-	regs = appendWordReg(regs, "TW", fpregs.Ftw)
-	regs = appendWordReg(regs, "FOP", fpregs.Fop)
-	regs = appendQwordReg(regs, "FIP", fpregs.Rip)
-	regs = appendQwordReg(regs, "FDP", fpregs.Rdp)
-
-	for i := 0; i < len(fpregs.StSpace); i += 4 {
-		regs = appendX87Reg(regs, i/4, uint16(fpregs.StSpace[i+2]), uint64(fpregs.StSpace[i+1])<<32|uint64(fpregs.StSpace[i]))
 	}
-
-	// SSE registers
-	regs = appendFlagReg(regs, "MXCSR", uint64(fpregs.Mxcsr), mxcsrDescription, 32)
-	regs = appendDwordReg(regs, "MXCSR_MASK", fpregs.MxcrMask)
-
-	for i := 0; i < len(fpregs.XmmSpace); i += 16 {
-		regs = appendSSEReg(regs, fmt.Sprintf("XMM%d", i/16), fpregs.XmmSpace[i:i+16])
-		if fpregs.AvxState {
-			regs = appendSSEReg(regs, fmt.Sprintf("YMM%d", i/16), fpregs.YmmSpace[i:i+16])
-		}
-	}
-
 	return
 }
+
+// Copy returns a copy of these registers that is
+// guarenteed not to change.
+func (r *Regs) Copy() proc.Registers {
+	var rr Regs
+	rr.regs = &sys.PtraceRegs{}
+	rr.fpregset = &proc.LinuxX86Xstate{}
+	*(rr.regs) = *(r.regs)
+	if r.fpregset != nil {
+		*(rr.fpregset) = *(r.fpregset)
+	}
+	if r.fpregs != nil {
+		rr.fpregs = make([]proc.Register, len(r.fpregs))
+		copy(rr.fpregs, r.fpregs)
+	}
+	return &rr
+}

vendor/github.com/derekparker/delve/pkg/proc/native/registers_windows_amd64.go

@@ -1,9 +1,12 @@
-package proc
+package native
 
 import (
 	"fmt"
-	"rsc.io/x86/x86asm"
 	"unsafe"
+
+	"golang.org/x/arch/x86/x86asm"
+
+	"github.com/derekparker/delve/pkg/proc"
 )
 
 // Regs represents CPU registers on an AMD64 processor.
@@ -30,10 +33,11 @@ type Regs struct {
 	fs      uint64
 	gs      uint64
 	tls     uint64
+	context *_CONTEXT
 	fltSave *_XMM_SAVE_AREA32
 }
 
-func (r *Regs) Slice() []Register {
+func (r *Regs) Slice() []proc.Register {
 	var regs = []struct {
 		k string
 		v uint64
@@ -65,31 +69,31 @@ func (r *Regs) Slice() []Register {
 	if r.fltSave != nil {
 		outlen += 6 + 8 + 2 + 16
 	}
-	out := make([]Register, 0, outlen)
+	out := make([]proc.Register, 0, outlen)
 	for _, reg := range regs {
 		if reg.k == "Eflags" {
-			out = append(out, Register{reg.k, eflagsDescription.Describe(reg.v, 64)})
+			out = proc.AppendEflagReg(out, reg.k, reg.v)
 		} else {
-			out = appendQwordReg(out, reg.k, reg.v)
+			out = proc.AppendQwordReg(out, reg.k, reg.v)
 		}
 	}
 	if r.fltSave != nil {
-		out = appendWordReg(out, "CW", r.fltSave.ControlWord)
+		out = proc.AppendWordReg(out, "CW", r.fltSave.ControlWord)
-		out = appendWordReg(out, "SW", r.fltSave.StatusWord)
+		out = proc.AppendWordReg(out, "SW", r.fltSave.StatusWord)
-		out = appendWordReg(out, "TW", uint16(r.fltSave.TagWord))
+		out = proc.AppendWordReg(out, "TW", uint16(r.fltSave.TagWord))
-		out = appendWordReg(out, "FOP", r.fltSave.ErrorOpcode)
+		out = proc.AppendWordReg(out, "FOP", r.fltSave.ErrorOpcode)
-		out = appendQwordReg(out, "FIP", uint64(r.fltSave.ErrorSelector)<<32|uint64(r.fltSave.ErrorOffset))
+		out = proc.AppendQwordReg(out, "FIP", uint64(r.fltSave.ErrorSelector)<<32|uint64(r.fltSave.ErrorOffset))
-		out = appendQwordReg(out, "FDP", uint64(r.fltSave.DataSelector)<<32|uint64(r.fltSave.DataOffset))
+		out = proc.AppendQwordReg(out, "FDP", uint64(r.fltSave.DataSelector)<<32|uint64(r.fltSave.DataOffset))
 
 		for i := range r.fltSave.FloatRegisters {
-			out = appendX87Reg(out, i, uint16(r.fltSave.FloatRegisters[i].High), r.fltSave.FloatRegisters[i].Low)
+			out = proc.AppendX87Reg(out, i, uint16(r.fltSave.FloatRegisters[i].High), r.fltSave.FloatRegisters[i].Low)
 		}
 
-		out = appendFlagReg(out, "MXCSR", uint64(r.fltSave.MxCsr), mxcsrDescription, 32)
+		out = proc.AppendMxcsrReg(out, "MXCSR", uint64(r.fltSave.MxCsr))
-		out = appendDwordReg(out, "MXCSR_MASK", r.fltSave.MxCsr_Mask)
+		out = proc.AppendDwordReg(out, "MXCSR_MASK", r.fltSave.MxCsr_Mask)
 
 		for i := 0; i < len(r.fltSave.XmmRegisters); i += 16 {
-			out = appendSSEReg(out, fmt.Sprintf("XMM%d", i/16), r.fltSave.XmmRegisters[i:i+16])
+			out = proc.AppendSSEReg(out, fmt.Sprintf("XMM%d", i/16), r.fltSave.XmmRegisters[i:i+16])
 		}
 	}
 	return out
@@ -107,6 +111,10 @@ func (r *Regs) SP() uint64 {
 	return r.rsp
 }
 
+func (r *Regs) BP() uint64 {
+	return r.rbp
+}
+
 // CX returns the value of the RCX register.
 func (r *Regs) CX() uint64 {
 	return r.rcx
@@ -119,8 +127,12 @@ func (r *Regs) TLS() uint64 {
 	return r.tls
 }
 
+func (r *Regs) GAddr() (uint64, bool) {
+	return 0, false
+}
+
 // SetPC sets the RIP register to the value specified by `pc`.
-func (r *Regs) SetPC(thread *Thread, pc uint64) error {
+func (thread *Thread) SetPC(pc uint64) error {
 	context := newCONTEXT()
 	context.ContextFlags = _CONTEXT_ALL
 
@@ -134,6 +146,35 @@ func (r *Regs) SetPC(thread *Thread, pc uint64) error {
 	return _SetThreadContext(thread.os.hThread, context)
 }
 
+// SetSP sets the RSP register to the value specified by `sp`.
+func (thread *Thread) SetSP(sp uint64) error {
+	context := newCONTEXT()
+	context.ContextFlags = _CONTEXT_ALL
+
+	err := _GetThreadContext(thread.os.hThread, context)
+	if err != nil {
+		return err
+	}
+
+	context.Rsp = sp
+
+	return _SetThreadContext(thread.os.hThread, context)
+}
+
+func (thread *Thread) SetDX(dx uint64) error {
+	context := newCONTEXT()
+	context.ContextFlags = _CONTEXT_ALL
+
+	err := _GetThreadContext(thread.os.hThread, context)
+	if err != nil {
+		return err
+	}
+
+	context.Rdx = dx
+
+	return _SetThreadContext(thread.os.hThread, context)
+}
+
 func (r *Regs) Get(n int) (uint64, error) {
 	reg := x86asm.Reg(n)
 	const (
@@ -155,7 +196,7 @@ func (r *Regs) Get(n int) (uint64, error) {
 	case x86asm.AH:
 		return (r.rax >> 8) & mask8, nil
 	case x86asm.CH:
-		return (r.rax >> 8) & mask8, nil
+		return (r.rcx >> 8) & mask8, nil
 	case x86asm.DH:
 		return (r.rdx >> 8) & mask8, nil
 	case x86asm.BH:
@@ -288,10 +329,10 @@ func (r *Regs) Get(n int) (uint64, error) {
 		return r.r15, nil
 	}
 
-	return 0, UnknownRegisterError
+	return 0, proc.ErrUnknownRegister
 }
 
-func registers(thread *Thread, floatingPoint bool) (Registers, error) {
+func registers(thread *Thread, floatingPoint bool) (proc.Registers, error) {
 	context := newCONTEXT()
 
 	context.ContextFlags = _CONTEXT_ALL
@@ -334,14 +375,16 @@ func registers(thread *Thread, floatingPoint bool) (Registers, error) {
 	if floatingPoint {
 		regs.fltSave = &context.FltSave
 	}
+	regs.context = context
 
 	return regs, nil
 }
 
-func (thread *Thread) saveRegisters() (Registers, error) {
+func (r *Regs) Copy() proc.Registers {
-	return nil, fmt.Errorf("not implemented: saveRegisters")
+	var rr Regs
-}
+	rr = *r
-
+	rr.context = newCONTEXT()
-func (thread *Thread) restoreRegisters() error {
+	*(rr.context) = *(r.context)
-	return fmt.Errorf("not implemented: restoreRegisters")
+	rr.fltSave = &rr.context.FltSave
+	return &rr
 }

vendor/github.com/derekparker/delve/pkg/proc/native/syscall_windows.go

@@ -1,6 +1,6 @@
 //go:generate go run $GOROOT/src/syscall/mksyscall_windows.go -output zsyscall_windows.go syscall_windows.go
 
-package proc
+package native
 
 import (
 	"syscall"

vendor/github.com/derekparker/delve/pkg/proc/native/syscall_windows_amd64.go

@@ -1,4 +1,4 @@
-package proc
+package native
 
 import "unsafe"
 

vendor/github.com/derekparker/delve/pkg/proc/native/threads.go

@@ -0,0 +1,174 @@
+package native
+
+import (
+	"fmt"
+
+	"github.com/derekparker/delve/pkg/proc"
+)
+
+// Thread represents a single thread in the traced process
+// ID represents the thread id or port, Process holds a reference to the
+// Process struct that contains info on the process as
+// a whole, and Status represents the last result of a `wait` call
+// on this thread.
+type Thread struct {
+	ID                int                  // Thread ID or mach port
+	Status            *WaitStatus          // Status returned from last wait call
+	CurrentBreakpoint proc.BreakpointState // Breakpoint thread is currently stopped at
+
+	dbp            *Process
+	singleStepping bool
+	os             *OSSpecificDetails
+	common         proc.CommonThread
+}
+
+// Continue the execution of this thread.
+//
+// If we are currently at a breakpoint, we'll clear it
+// first and then resume execution. Thread will continue until
+// it hits a breakpoint or is signaled.
+func (t *Thread) Continue() error {
+	pc, err := t.PC()
+	if err != nil {
+		return err
+	}
+	// Check whether we are stopped at a breakpoint, and
+	// if so, single step over it before continuing.
+	if _, ok := t.dbp.FindBreakpoint(pc); ok {
+		if err := t.StepInstruction(); err != nil {
+			return err
+		}
+	}
+	return t.resume()
+}
+
+// StepInstruction steps a single instruction.
+//
+// Executes exactly one instruction and then returns.
+// If the thread is at a breakpoint, we first clear it,
+// execute the instruction, and then replace the breakpoint.
+// Otherwise we simply execute the next instruction.
+func (t *Thread) StepInstruction() (err error) {
+	t.singleStepping = true
+	defer func() {
+		t.singleStepping = false
+	}()
+	pc, err := t.PC()
+	if err != nil {
+		return err
+	}
+
+	bp, ok := t.dbp.FindBreakpoint(pc)
+	if ok {
+		// Clear the breakpoint so that we can continue execution.
+		err = t.ClearBreakpoint(bp)
+		if err != nil {
+			return err
+		}
+
+		// Restore breakpoint now that we have passed it.
+		defer func() {
+			err = t.dbp.writeSoftwareBreakpoint(t, bp.Addr)
+		}()
+	}
+
+	err = t.singleStep()
+	if err != nil {
+		if _, exited := err.(proc.ErrProcessExited); exited {
+			return err
+		}
+		return fmt.Errorf("step failed: %s", err.Error())
+	}
+	return nil
+}
+
+// Location returns the threads location, including the file:line
+// of the corresponding source code, the function we're in
+// and the current instruction address.
+func (t *Thread) Location() (*proc.Location, error) {
+	pc, err := t.PC()
+	if err != nil {
+		return nil, err
+	}
+	f, l, fn := t.dbp.bi.PCToLine(pc)
+	return &proc.Location{PC: pc, File: f, Line: l, Fn: fn}, nil
+}
+
+// Arch returns the architecture the binary is
+// compiled for and executing on.
+func (t *Thread) Arch() proc.Arch {
+	return t.dbp.bi.Arch
+}
+
+// BinInfo returns information on the binary.
+func (t *Thread) BinInfo() *proc.BinaryInfo {
+	return t.dbp.bi
+}
+
+// Common returns information common across Process
+// implementations.
+func (t *Thread) Common() *proc.CommonThread {
+	return &t.common
+}
+
+// SetCurrentBreakpoint sets the current breakpoint that this
+// thread is stopped at as CurrentBreakpoint on the thread struct.
+func (t *Thread) SetCurrentBreakpoint() error {
+	t.CurrentBreakpoint.Clear()
+	pc, err := t.PC()
+	if err != nil {
+		return err
+	}
+	if bp, ok := t.dbp.FindBreakpoint(pc); ok {
+		if err = t.SetPC(bp.Addr); err != nil {
+			return err
+		}
+		t.CurrentBreakpoint = bp.CheckCondition(t)
+		if t.CurrentBreakpoint.Breakpoint != nil && t.CurrentBreakpoint.Active {
+			if g, err := proc.GetG(t); err == nil {
+				t.CurrentBreakpoint.HitCount[g.ID]++
+			}
+			t.CurrentBreakpoint.TotalHitCount++
+		}
+	}
+	return nil
+}
+
+// Breakpoint returns the current breakpoint that is active
+// on this thread.
+func (t *Thread) Breakpoint() proc.BreakpointState {
+	return t.CurrentBreakpoint
+}
+
+// ThreadID returns the ID of this thread.
+func (t *Thread) ThreadID() int {
+	return t.ID
+}
+
+// ClearBreakpoint clears the specified breakpoint.
+func (t *Thread) ClearBreakpoint(bp *proc.Breakpoint) error {
+	if _, err := t.WriteMemory(uintptr(bp.Addr), bp.OriginalData); err != nil {
+		return fmt.Errorf("could not clear breakpoint %s", err)
+	}
+	return nil
+}
+
+// Registers obtains register values from the debugged process.
+func (t *Thread) Registers(floatingPoint bool) (proc.Registers, error) {
+	return registers(t, floatingPoint)
+}
+
+// RestoreRegisters will set the value of the CPU registers to those
+// passed in via 'savedRegs'.
+func (t *Thread) RestoreRegisters(savedRegs proc.Registers) error {
+	return t.restoreRegisters(savedRegs)
+}
+
+// PC returns the current program counter value for this thread.
+func (t *Thread) PC() (uint64, error) {
+	regs, err := t.Registers(false)
+	if err != nil {
+		return 0, err
+	}
+	return regs.PC(), nil
+}

vendor/github.com/derekparker/delve/pkg/proc/native/threads_darwin.c

@@ -1,3 +1,5 @@
+//+build darwin,macnative
+
 #include "threads_darwin.h"
 
 int

vendor/github.com/derekparker/delve/pkg/proc/native/threads_darwin.go

@@ -1,12 +1,18 @@
-package proc
+//+build darwin,macnative
+
+package native
 
 // #include "threads_darwin.h"
 // #include "proc_darwin.h"
 import "C"
 import (
+	"errors"
 	"fmt"
-	sys "golang.org/x/sys/unix"
 	"unsafe"
+
+	sys "golang.org/x/sys/unix"
+
+	"github.com/derekparker/delve/pkg/proc"
 )
 
 // WaitStatus is a synonym for the platform-specific WaitStatus
@@ -24,7 +30,7 @@ type OSSpecificDetails struct {
 // be continued.
 var ErrContinueThread = fmt.Errorf("could not continue thread")
 
-func (t *Thread) halt() (err error) {
+func (t *Thread) stop() (err error) {
 	kret := C.thread_suspend(t.os.threadAct)
 	if kret != C.KERN_SUCCESS {
 		errStr := C.GoString(C.mach_error_string(C.mach_error_t(kret)))
@@ -35,7 +41,7 @@ func (t *Thread) halt() (err error) {
 			return
 		}
 
-		if _, ok := t.dbp.Threads[t.ID]; ok {
+		if _, ok := t.dbp.threads[t.ID]; ok {
 			err = fmt.Errorf("could not suspend thread %d %s", t.ID, errStr)
 			return
 		}
@@ -49,7 +55,7 @@ func (t *Thread) singleStep() error {
 		return fmt.Errorf("could not single step")
 	}
 	for {
-		twthread, err := t.dbp.trapWait(t.dbp.Pid)
+		twthread, err := t.dbp.trapWait(t.dbp.pid)
 		if err != nil {
 			return err
 		}
@@ -66,10 +72,9 @@ func (t *Thread) singleStep() error {
 }
 
 func (t *Thread) resume() error {
-	t.running = true
 	// TODO(dp) set flag for ptrace stops
 	var err error
-	t.dbp.execPtraceFunc(func() { err = PtraceCont(t.dbp.Pid, 0) })
+	t.dbp.execPtraceFunc(func() { err = PtraceCont(t.dbp.pid, 0) })
 	if err == nil {
 		return nil
 	}
@@ -80,29 +85,35 @@ func (t *Thread) resume() error {
 	return nil
 }
 
-func (t *Thread) blocked() bool {
+func (t *Thread) Blocked() bool {
 	// TODO(dp) cache the func pc to remove this lookup
-	pc, err := t.PC()
+	regs, err := t.Registers(false)
 	if err != nil {
 		return false
 	}
-	fn := t.dbp.goSymTable.PCToFunc(pc)
+	pc := regs.PC()
+	fn := t.BinInfo().PCToFunc(pc)
 	if fn == nil {
 		return false
 	}
 	switch fn.Name {
-	case "runtime.kevent", "runtime.mach_semaphore_wait", "runtime.usleep":
+	case "runtime.kevent", "runtime.mach_semaphore_wait", "runtime.usleep", "runtime.mach_semaphore_timedwait":
 		return true
 	default:
 		return false
 	}
 }
 
-func (t *Thread) stopped() bool {
+// Stopped returns whether the thread is stopped at
+// the operating system level.
+func (t *Thread) Stopped() bool {
 	return C.thread_blocked(t.os.threadAct) > C.int(0)
 }
 
-func (t *Thread) writeMemory(addr uintptr, data []byte) (int, error) {
+func (t *Thread) WriteMemory(addr uintptr, data []byte) (int, error) {
+	if t.dbp.exited {
+		return 0, proc.ErrProcessExited{Pid: t.dbp.pid}
+	}
 	if len(data) == 0 {
 		return 0, nil
 	}
@@ -117,20 +128,26 @@ func (t *Thread) writeMemory(addr uintptr, data []byte) (int, error) {
 	return len(data), nil
 }
 
-func (t *Thread) readMemory(addr uintptr, size int) ([]byte, error) {
+func (t *Thread) ReadMemory(buf []byte, addr uintptr) (int, error) {
-	if size == 0 {
+	if t.dbp.exited {
-		return nil, nil
+		return 0, proc.ErrProcessExited{Pid: t.dbp.pid}
+	}
+	if len(buf) == 0 {
+		return 0, nil
 	}
 	var (
-		buf    = make([]byte, size)
 		vmData = unsafe.Pointer(&buf[0])
 		vmAddr = C.mach_vm_address_t(addr)
-		length = C.mach_msg_type_number_t(size)
+		length = C.mach_msg_type_number_t(len(buf))
 	)
 
 	ret := C.read_memory(t.dbp.os.task, vmAddr, vmData, length)
 	if ret < 0 {
-		return nil, fmt.Errorf("could not read memory")
+		return 0, fmt.Errorf("could not read memory")
 	}
-	return buf, nil
+	return len(buf), nil
+}
+
+func (t *Thread) restoreRegisters(sr proc.Registers) error {
+	return errors.New("not implemented")
 }

vendor/github.com/derekparker/delve/pkg/proc/native/threads_darwin.h

@@ -1,3 +1,5 @@
+//+build darwin,macnative
+
 #include <stdlib.h>
 #include <sys/types.h>
 #include <mach/mach.h>

vendor/github.com/derekparker/delve/pkg/proc/native/threads_linux.go

@@ -0,0 +1,132 @@
+package native
+
+import (
+	"fmt"
+	"syscall"
+	"unsafe"
+
+	sys "golang.org/x/sys/unix"
+
+	"github.com/derekparker/delve/pkg/proc"
+)
+
+type WaitStatus sys.WaitStatus
+
+// OSSpecificDetails hold Linux specific
+// process details.
+type OSSpecificDetails struct {
+	registers sys.PtraceRegs
+	running   bool
+}
+
+func (t *Thread) stop() (err error) {
+	err = sys.Tgkill(t.dbp.pid, t.ID, sys.SIGSTOP)
+	if err != nil {
+		err = fmt.Errorf("stop err %s on thread %d", err, t.ID)
+		return
+	}
+	return
+}
+
+// Stopped returns whether the thread is stopped at
+// the operating system level.
+func (t *Thread) Stopped() bool {
+	state := status(t.ID, t.dbp.os.comm)
+	return state == StatusTraceStop || state == StatusTraceStopT
+}
+
+func (t *Thread) resume() error {
+	return t.resumeWithSig(0)
+}
+
+func (t *Thread) resumeWithSig(sig int) (err error) {
+	t.os.running = true
+	t.dbp.execPtraceFunc(func() { err = PtraceCont(t.ID, sig) })
+	return
+}
+
+func (t *Thread) singleStep() (err error) {
+	for {
+		t.dbp.execPtraceFunc(func() { err = sys.PtraceSingleStep(t.ID) })
+		if err != nil {
+			return err
+		}
+		wpid, status, err := t.dbp.waitFast(t.ID)
+		if err != nil {
+			return err
+		}
+		if (status == nil || status.Exited()) && wpid == t.dbp.pid {
+			t.dbp.postExit()
+			rs := 0
+			if status != nil {
+				rs = status.ExitStatus()
+			}
+			return proc.ErrProcessExited{Pid: t.dbp.pid, Status: rs}
+		}
+		if wpid == t.ID && status.StopSignal() == sys.SIGTRAP {
+			return nil
+		}
+	}
+}
+
+func (t *Thread) Blocked() bool {
+	regs, err := t.Registers(false)
+	if err != nil {
+		return false
+	}
+	pc := regs.PC()
+	fn := t.BinInfo().PCToFunc(pc)
+	if fn != nil && ((fn.Name == "runtime.futex") || (fn.Name == "runtime.usleep") || (fn.Name == "runtime.clone")) {
+		return true
+	}
+	return false
+}
+
+func (t *Thread) restoreRegisters(savedRegs proc.Registers) error {
+	sr := savedRegs.(*Regs)
+
+	var restoreRegistersErr error
+	t.dbp.execPtraceFunc(func() {
+		restoreRegistersErr = sys.PtraceSetRegs(t.ID, sr.regs)
+		if restoreRegistersErr != nil {
+			return
+		}
+		if sr.fpregset.Xsave != nil {
+			iov := sys.Iovec{Base: &sr.fpregset.Xsave[0], Len: uint64(len(sr.fpregset.Xsave))}
+			_, _, restoreRegistersErr = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_SETREGSET, uintptr(t.ID), _NT_X86_XSTATE, uintptr(unsafe.Pointer(&iov)), 0, 0)
+			return
+		}
+
+		_, _, restoreRegistersErr = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_SETFPREGS, uintptr(t.ID), uintptr(0), uintptr(unsafe.Pointer(&sr.fpregset.PtraceFpRegs)), 0, 0)
+		return
+	})
+	if restoreRegistersErr == syscall.Errno(0) {
+		restoreRegistersErr = nil
+	}
+	return restoreRegistersErr
+}
+
+func (t *Thread) WriteMemory(addr uintptr, data []byte) (written int, err error) {
+	if t.dbp.exited {
+		return 0, proc.ErrProcessExited{Pid: t.dbp.pid}
+	}
+	if len(data) == 0 {
+		return
+	}
+	t.dbp.execPtraceFunc(func() { written, err = sys.PtracePokeData(t.ID, addr, data) })
+	return
+}
+
+func (t *Thread) ReadMemory(data []byte, addr uintptr) (n int, err error) {
+	if t.dbp.exited {
+		return 0, proc.ErrProcessExited{Pid: t.dbp.pid}
+	}
+	if len(data) == 0 {
+		return
+	}
+	t.dbp.execPtraceFunc(func() { _, err = sys.PtracePeekData(t.ID, addr, data) })
+	if err == nil {
+		n = len(data)
+	}
+	return
+}

vendor/github.com/derekparker/delve/pkg/proc/native/threads_windows.go

@@ -1,9 +1,12 @@
-package proc
+package native
 
 import (
+	"errors"
 	"syscall"
 
 	sys "golang.org/x/sys/windows"
+
+	"github.com/derekparker/delve/pkg/proc"
 )
 
 // WaitStatus is a synonym for the platform-specific WaitStatus
@@ -15,16 +18,6 @@ type OSSpecificDetails struct {
 	hThread syscall.Handle
 }
 
-func (t *Thread) halt() (err error) {
-	// Ignore the request to halt. On Windows, all threads are halted
-	// on return from WaitForDebugEvent.
-	return nil
-
-	// TODO - This may not be correct in all usages of dbp.Halt.  There
-	// are some callers who use dbp.Halt() to stop the process when it is not
-	// already broken on a debug event.
-}
-
 func (t *Thread) singleStep() error {
 	context := newCONTEXT()
 	context.ContextFlags = _CONTEXT_ALL
@@ -57,7 +50,7 @@ func (t *Thread) singleStep() error {
 		}
 		if tid == 0 {
 			t.dbp.postExit()
-			return ProcessExitedError{Pid: t.dbp.Pid, Status: exitCode}
+			return proc.ErrProcessExited{Pid: t.dbp.pid, Status: exitCode}
 		}
 
 		if t.dbp.os.breakThread == t.ID {
@@ -65,7 +58,7 @@ func (t *Thread) singleStep() error {
 		}
 
 		t.dbp.execPtraceFunc(func() {
-			err = _ContinueDebugEvent(uint32(t.dbp.Pid), uint32(t.dbp.os.breakThread), _DBG_CONTINUE)
+			err = _ContinueDebugEvent(uint32(t.dbp.pid), uint32(t.dbp.os.breakThread), _DBG_CONTINUE)
 		})
 	}
 
@@ -75,7 +68,7 @@ func (t *Thread) singleStep() error {
 	}
 
 	t.dbp.execPtraceFunc(func() {
-		err = _ContinueDebugEvent(uint32(t.dbp.Pid), uint32(t.ID), _DBG_CONTINUE)
+		err = _ContinueDebugEvent(uint32(t.dbp.pid), uint32(t.ID), _DBG_CONTINUE)
 	})
 	if err != nil {
 		return err
@@ -93,24 +86,24 @@ func (t *Thread) singleStep() error {
 }
 
 func (t *Thread) resume() error {
-	t.running = true
 	var err error
 	t.dbp.execPtraceFunc(func() {
 		//TODO: Note that we are ignoring the thread we were asked to continue and are continuing the
 		//thread that we last broke on.
-		err = _ContinueDebugEvent(uint32(t.dbp.Pid), uint32(t.ID), _DBG_CONTINUE)
+		err = _ContinueDebugEvent(uint32(t.dbp.pid), uint32(t.ID), _DBG_CONTINUE)
 	})
 	return err
 }
 
-func (t *Thread) blocked() bool {
+func (t *Thread) Blocked() bool {
 	// TODO: Probably incorrect - what are the runtime functions that
 	// indicate blocking on Windows?
-	pc, err := t.PC()
+	regs, err := t.Registers(false)
 	if err != nil {
 		return false
 	}
-	fn := t.dbp.goSymTable.PCToFunc(pc)
+	pc := regs.PC()
+	fn := t.BinInfo().PCToFunc(pc)
 	if fn == nil {
 		return false
 	}
@@ -122,13 +115,19 @@ func (t *Thread) blocked() bool {
 	}
 }
 
-func (t *Thread) stopped() bool {
+// Stopped returns whether the thread is stopped at the operating system
-	// TODO: We are assuming that threads are always stopped
+// level. On windows this always returns true.
-	// during command execution.
+func (t *Thread) Stopped() bool {
 	return true
 }
 
-func (t *Thread) writeMemory(addr uintptr, data []byte) (int, error) {
+func (t *Thread) WriteMemory(addr uintptr, data []byte) (int, error) {
+	if t.dbp.exited {
+		return 0, proc.ErrProcessExited{Pid: t.dbp.pid}
+	}
+	if len(data) == 0 {
+		return 0, nil
+	}
 	var count uintptr
 	err := _WriteProcessMemory(t.dbp.os.hProcess, addr, &data[0], uintptr(len(data)), &count)
 	if err != nil {
@@ -137,15 +136,23 @@ func (t *Thread) writeMemory(addr uintptr, data []byte) (int, error) {
 	return int(count), nil
 }
 
-func (t *Thread) readMemory(addr uintptr, size int) ([]byte, error) {
+var ErrShortRead = errors.New("short read")
-	if size == 0 {
+
-		return nil, nil
+func (t *Thread) ReadMemory(buf []byte, addr uintptr) (int, error) {
+	if t.dbp.exited {
+		return 0, proc.ErrProcessExited{Pid: t.dbp.pid}
+	}
+	if len(buf) == 0 {
+		return 0, nil
 	}
 	var count uintptr
-	buf := make([]byte, size)
+	err := _ReadProcessMemory(t.dbp.os.hProcess, addr, &buf[0], uintptr(len(buf)), &count)
-	err := _ReadProcessMemory(t.dbp.os.hProcess, addr, &buf[0], uintptr(size), &count)
+	if err == nil && count != uintptr(len(buf)) {
-	if err != nil {
+		err = ErrShortRead
-		return nil, err
 	}
-	return buf[:count], nil
+	return int(count), err
+}
+
+func (t *Thread) restoreRegisters(savedRegs proc.Registers) error {
+	return _SetThreadContext(t.os.hThread, savedRegs.(*Regs).context)
 }

vendor/github.com/derekparker/delve/pkg/proc/native/zsyscall_windows.go

@@ -1,6 +1,6 @@
 // MACHINE GENERATED BY 'go generate' COMMAND; DO NOT EDIT
 
-package proc
+package native
 
 import (
 	"syscall"

vendor/github.com/derekparker/delve/pkg/proc/proc.go

@@ -0,0 +1,658 @@
+package proc
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"go/ast"
+	"go/token"
+	"path/filepath"
+	"strconv"
+	"strings"
+)
+
+// ErrNotExecutable is returned after attempting to execute a non-executable file
+// to begin a debug session.
+var ErrNotExecutable = errors.New("not an executable file")
+
+// ErrNotRecorded is returned when an action is requested that is
+// only possible on recorded (traced) programs.
+var ErrNotRecorded = errors.New("not a recording")
+
+// UnrecoveredPanic is the name given to the unrecovered panic breakpoint.
+const UnrecoveredPanic = "unrecovered-panic"
+
+// ErrProcessExited indicates that the process has exited and contains both
+// process id and exit status.
+type ErrProcessExited struct {
+	Pid    int
+	Status int
+}
+
+func (pe ErrProcessExited) Error() string {
+	return fmt.Sprintf("Process %d has exited with status %d", pe.Pid, pe.Status)
+}
+
+// ProcessDetachedError indicates that we detached from the target process.
+type ProcessDetachedError struct {
+}
+
+func (pe ProcessDetachedError) Error() string {
+	return "detached from the process"
+}
+
+// FindFileLocation returns the PC for a given file:line.
+// Assumes that `file` is normalized to lower case and '/' on Windows.
+func FindFileLocation(p Process, fileName string, lineno int) (uint64, error) {
+	pc, fn, err := p.BinInfo().LineToPC(fileName, lineno)
+	if err != nil {
+		return 0, err
+	}
+	if fn.Entry == pc {
+		pc, _ = FirstPCAfterPrologue(p, fn, true)
+	}
+	return pc, nil
+}
+
+// ErrFunctionNotFound is returned when failing to find the
+// function named 'FuncName' within the binary.
+type ErrFunctionNotFound struct {
+	FuncName string
+}
+
+func (err *ErrFunctionNotFound) Error() string {
+	return fmt.Sprintf("Could not find function %s\n", err.FuncName)
+}
+
+// FindFunctionLocation finds address of a function's line
+// If firstLine == true is passed FindFunctionLocation will attempt to find the first line of the function
+// If lineOffset is passed FindFunctionLocation will return the address of that line
+// Pass lineOffset == 0 and firstLine == false if you want the address for the function's entry point
+// Note that setting breakpoints at that address will cause surprising behavior:
+// https://github.com/derekparker/delve/issues/170
+func FindFunctionLocation(p Process, funcName string, firstLine bool, lineOffset int) (uint64, error) {
+	bi := p.BinInfo()
+	origfn := bi.LookupFunc[funcName]
+	if origfn == nil {
+		return 0, &ErrFunctionNotFound{funcName}
+	}
+
+	if firstLine {
+		return FirstPCAfterPrologue(p, origfn, false)
+	} else if lineOffset > 0 {
+		filename, lineno := origfn.cu.lineInfo.PCToLine(origfn.Entry, origfn.Entry)
+		breakAddr, _, err := bi.LineToPC(filename, lineno+lineOffset)
+		return breakAddr, err
+	}
+
+	return origfn.Entry, nil
+}
+
+// Next continues execution until the next source line.
+func Next(dbp Process) (err error) {
+	if _, err := dbp.Valid(); err != nil {
+		return err
+	}
+	if dbp.Breakpoints().HasInternalBreakpoints() {
+		return fmt.Errorf("next while nexting")
+	}
+
+	if err = next(dbp, false, false); err != nil {
+		dbp.ClearInternalBreakpoints()
+		return
+	}
+
+	return Continue(dbp)
+}
+
+// Continue continues execution of the debugged
+// process. It will continue until it hits a breakpoint
+// or is otherwise stopped.
+func Continue(dbp Process) error {
+	if _, err := dbp.Valid(); err != nil {
+		return err
+	}
+	for _, thread := range dbp.ThreadList() {
+		thread.Common().returnValues = nil
+	}
+	dbp.CheckAndClearManualStopRequest()
+	defer func() {
+		// Make sure we clear internal breakpoints if we simultaneously receive a
+		// manual stop request and hit a breakpoint.
+		if dbp.CheckAndClearManualStopRequest() {
+			dbp.ClearInternalBreakpoints()
+		}
+	}()
+	for {
+		if dbp.CheckAndClearManualStopRequest() {
+			dbp.ClearInternalBreakpoints()
+			return nil
+		}
+		trapthread, err := dbp.ContinueOnce()
+		if err != nil {
+			return err
+		}
+
+		threads := dbp.ThreadList()
+
+		if err := pickCurrentThread(dbp, trapthread, threads); err != nil {
+			return err
+		}
+
+		curthread := dbp.CurrentThread()
+		curbp := curthread.Breakpoint()
+
+		switch {
+		case curbp.Breakpoint == nil:
+			// runtime.Breakpoint, manual stop or debugCallV1-related stop
+			recorded, _ := dbp.Recorded()
+			if recorded {
+				return conditionErrors(threads)
+			}
+
+			loc, err := curthread.Location()
+			if err != nil || loc.Fn == nil {
+				return conditionErrors(threads)
+			}
+
+			switch {
+			case loc.Fn.Name == "runtime.breakpoint":
+				// Single-step current thread until we exit runtime.breakpoint and
+				// runtime.Breakpoint.
+				// On go < 1.8 it was sufficient to single-step twice on go1.8 a change
+				// to the compiler requires 4 steps.
+				if err := stepInstructionOut(dbp, curthread, "runtime.breakpoint", "runtime.Breakpoint"); err != nil {
+					return err
+				}
+				return conditionErrors(threads)
+			case strings.HasPrefix(loc.Fn.Name, debugCallFunctionNamePrefix1) || strings.HasPrefix(loc.Fn.Name, debugCallFunctionNamePrefix2):
+				fncall := &dbp.Common().fncallState
+				if !fncall.inProgress {
+					return conditionErrors(threads)
+				}
+				fncall.step(dbp)
+				// only stop execution if the function call finished
+				if fncall.finished {
+					fncall.inProgress = false
+					if fncall.err != nil {
+						return fncall.err
+					}
+					curthread.Common().returnValues = fncall.returnValues()
+					return conditionErrors(threads)
+				}
+			default:
+				return conditionErrors(threads)
+			}
+		case curbp.Active && curbp.Internal:
+			if curbp.Kind == StepBreakpoint {
+				// See description of proc.(*Process).next for the meaning of StepBreakpoints
+				if err := conditionErrors(threads); err != nil {
+					return err
+				}
+				regs, err := curthread.Registers(false)
+				if err != nil {
+					return err
+				}
+				pc := regs.PC()
+				text, err := disassemble(curthread, regs, dbp.Breakpoints(), dbp.BinInfo(), pc, pc+maxInstructionLength, true)
+				if err != nil {
+					return err
+				}
+				// here we either set a breakpoint into the destination of the CALL
+				// instruction or we determined that the called function is hidden,
+				// either way we need to resume execution
+				if err = setStepIntoBreakpoint(dbp, text, SameGoroutineCondition(dbp.SelectedGoroutine())); err != nil {
+					return err
+				}
+			} else {
+				curthread.Common().returnValues = curbp.Breakpoint.returnInfo.Collect(curthread)
+				if err := dbp.ClearInternalBreakpoints(); err != nil {
+					return err
+				}
+				return conditionErrors(threads)
+			}
+		case curbp.Active:
+			onNextGoroutine, err := onNextGoroutine(curthread, dbp.Breakpoints())
+			if err != nil {
+				return err
+			}
+			if onNextGoroutine {
+				err := dbp.ClearInternalBreakpoints()
+				if err != nil {
+					return err
+				}
+			}
+			if curbp.Name == UnrecoveredPanic {
+				dbp.ClearInternalBreakpoints()
+			}
+			return conditionErrors(threads)
+		default:
+			// not a manual stop, not on runtime.Breakpoint, not on a breakpoint, just repeat
+		}
+	}
+}
+
+func conditionErrors(threads []Thread) error {
+	var condErr error
+	for _, th := range threads {
+		if bp := th.Breakpoint(); bp.Breakpoint != nil && bp.CondError != nil {
+			if condErr == nil {
+				condErr = bp.CondError
+			} else {
+				return fmt.Errorf("multiple errors evaluating conditions")
+			}
+		}
+	}
+	return condErr
+}
+
+// pick a new dbp.currentThread, with the following priority:
+// 	- a thread with onTriggeredInternalBreakpoint() == true
+// 	- a thread with onTriggeredBreakpoint() == true (prioritizing trapthread)
+// 	- trapthread
+func pickCurrentThread(dbp Process, trapthread Thread, threads []Thread) error {
+	for _, th := range threads {
+		if bp := th.Breakpoint(); bp.Active && bp.Internal {
+			return dbp.SwitchThread(th.ThreadID())
+		}
+	}
+	if bp := trapthread.Breakpoint(); bp.Active {
+		return dbp.SwitchThread(trapthread.ThreadID())
+	}
+	for _, th := range threads {
+		if bp := th.Breakpoint(); bp.Active {
+			return dbp.SwitchThread(th.ThreadID())
+		}
+	}
+	return dbp.SwitchThread(trapthread.ThreadID())
+}
+
+// stepInstructionOut repeatedly calls StepInstruction until the current
+// function is neither fnname1 or fnname2.
+// This function is used to step out of runtime.Breakpoint as well as
+// runtime.debugCallV1.
+func stepInstructionOut(dbp Process, curthread Thread, fnname1, fnname2 string) error {
+	for {
+		if err := curthread.StepInstruction(); err != nil {
+			return err
+		}
+		loc, err := curthread.Location()
+		if err != nil || loc.Fn == nil || (loc.Fn.Name != fnname1 && loc.Fn.Name != fnname2) {
+			if g := dbp.SelectedGoroutine(); g != nil {
+				g.CurrentLoc = *loc
+			}
+			return nil
+		}
+	}
+}
+
+// Step will continue until another source line is reached.
+// Will step into functions.
+func Step(dbp Process) (err error) {
+	if _, err := dbp.Valid(); err != nil {
+		return err
+	}
+	if dbp.Breakpoints().HasInternalBreakpoints() {
+		return fmt.Errorf("next while nexting")
+	}
+
+	if err = next(dbp, true, false); err != nil {
+		switch err.(type) {
+		case ErrThreadBlocked: // Noop
+		default:
+			dbp.ClearInternalBreakpoints()
+			return
+		}
+	}
+
+	return Continue(dbp)
+}
+
+// SameGoroutineCondition returns an expression that evaluates to true when
+// the current goroutine is g.
+func SameGoroutineCondition(g *G) ast.Expr {
+	if g == nil {
+		return nil
+	}
+	return &ast.BinaryExpr{
+		Op: token.EQL,
+		X: &ast.SelectorExpr{
+			X: &ast.SelectorExpr{
+				X:   &ast.Ident{Name: "runtime"},
+				Sel: &ast.Ident{Name: "curg"},
+			},
+			Sel: &ast.Ident{Name: "goid"},
+		},
+		Y: &ast.BasicLit{Kind: token.INT, Value: strconv.Itoa(g.ID)},
+	}
+}
+
+func frameoffCondition(frameoff int64) ast.Expr {
+	return &ast.BinaryExpr{
+		Op: token.EQL,
+		X: &ast.SelectorExpr{
+			X:   &ast.Ident{Name: "runtime"},
+			Sel: &ast.Ident{Name: "frameoff"},
+		},
+		Y: &ast.BasicLit{Kind: token.INT, Value: strconv.FormatInt(frameoff, 10)},
+	}
+}
+
+func andFrameoffCondition(cond ast.Expr, frameoff int64) ast.Expr {
+	if cond == nil {
+		return nil
+	}
+	return &ast.BinaryExpr{
+		Op: token.LAND,
+		X:  cond,
+		Y:  frameoffCondition(frameoff),
+	}
+}
+
+// StepOut will continue until the current goroutine exits the
+// function currently being executed or a deferred function is executed
+func StepOut(dbp Process) error {
+	if _, err := dbp.Valid(); err != nil {
+		return err
+	}
+	if dbp.Breakpoints().HasInternalBreakpoints() {
+		return fmt.Errorf("next while nexting")
+	}
+
+	selg := dbp.SelectedGoroutine()
+	curthread := dbp.CurrentThread()
+
+	topframe, retframe, err := topframe(selg, curthread)
+	if err != nil {
+		return err
+	}
+
+	success := false
+	defer func() {
+		if !success {
+			dbp.ClearInternalBreakpoints()
+		}
+	}()
+
+	if topframe.Inlined {
+		if err := next(dbp, false, true); err != nil {
+			return err
+		}
+
+		success = true
+		return Continue(dbp)
+	}
+
+	sameGCond := SameGoroutineCondition(selg)
+	retFrameCond := andFrameoffCondition(sameGCond, retframe.FrameOffset())
+
+	var deferpc uint64
+	if filepath.Ext(topframe.Current.File) == ".go" {
+		if topframe.TopmostDefer != nil && topframe.TopmostDefer.DeferredPC != 0 {
+			deferfn := dbp.BinInfo().PCToFunc(topframe.TopmostDefer.DeferredPC)
+			deferpc, err = FirstPCAfterPrologue(dbp, deferfn, false)
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	if deferpc != 0 && deferpc != topframe.Current.PC {
+		bp, err := dbp.SetBreakpoint(deferpc, NextDeferBreakpoint, sameGCond)
+		if err != nil {
+			if _, ok := err.(BreakpointExistsError); !ok {
+				return err
+			}
+		}
+		if bp != nil {
+			// For StepOut we do not want to step into the deferred function
+			// when it's called by runtime.deferreturn so we do not populate
+			// DeferReturns.
+			bp.DeferReturns = []uint64{}
+		}
+	}
+
+	if topframe.Ret == 0 && deferpc == 0 {
+		return errors.New("nothing to stepout to")
+	}
+
+	if topframe.Ret != 0 {
+		bp, err := dbp.SetBreakpoint(topframe.Ret, NextBreakpoint, retFrameCond)
+		if err != nil {
+			if _, isexists := err.(BreakpointExistsError); !isexists {
+				return err
+			}
+		}
+		if bp != nil {
+			configureReturnBreakpoint(dbp.BinInfo(), bp, &topframe, retFrameCond)
+		}
+	}
+
+	if bp := curthread.Breakpoint(); bp.Breakpoint == nil {
+		curthread.SetCurrentBreakpoint()
+	}
+
+	success = true
+	return Continue(dbp)
+}
+
+// GoroutinesInfo returns an array of G structures representing the information
+// Delve cares about from the internal runtime G structure.
+func GoroutinesInfo(dbp Process) ([]*G, error) {
+	if _, err := dbp.Valid(); err != nil {
+		return nil, err
+	}
+	if dbp.Common().allGCache != nil {
+		return dbp.Common().allGCache, nil
+	}
+
+	var (
+		threadg = map[int]*G{}
+		allg    []*G
+		rdr     = dbp.BinInfo().DwarfReader()
+	)
+
+	threads := dbp.ThreadList()
+	for _, th := range threads {
+		if th.Blocked() {
+			continue
+		}
+		g, _ := GetG(th)
+		if g != nil {
+			threadg[g.ID] = g
+		}
+	}
+
+	addr, err := rdr.AddrFor("runtime.allglen", dbp.BinInfo().staticBase)
+	if err != nil {
+		return nil, err
+	}
+	allglenBytes := make([]byte, 8)
+	_, err = dbp.CurrentThread().ReadMemory(allglenBytes, uintptr(addr))
+	if err != nil {
+		return nil, err
+	}
+	allglen := binary.LittleEndian.Uint64(allglenBytes)
+
+	rdr.Seek(0)
+	allgentryaddr, err := rdr.AddrFor("runtime.allgs", dbp.BinInfo().staticBase)
+	if err != nil {
+		// try old name (pre Go 1.6)
+		allgentryaddr, err = rdr.AddrFor("runtime.allg", dbp.BinInfo().staticBase)
+		if err != nil {
+			return nil, err
+		}
+	}
+	faddr := make([]byte, dbp.BinInfo().Arch.PtrSize())
+	_, err = dbp.CurrentThread().ReadMemory(faddr, uintptr(allgentryaddr))
+	if err != nil {
+		return nil, err
+	}
+	allgptr := binary.LittleEndian.Uint64(faddr)
+
+	for i := uint64(0); i < allglen; i++ {
+		gvar, err := newGVariable(dbp.CurrentThread(), uintptr(allgptr+(i*uint64(dbp.BinInfo().Arch.PtrSize()))), true)
+		if err != nil {
+			allg = append(allg, &G{Unreadable: err})
+			continue
+		}
+		g, err := gvar.parseG()
+		if err != nil {
+			allg = append(allg, &G{Unreadable: err})
+			continue
+		}
+		if thg, allocated := threadg[g.ID]; allocated {
+			loc, err := thg.Thread.Location()
+			if err != nil {
+				return nil, err
+			}
+			g.Thread = thg.Thread
+			// Prefer actual thread location information.
+			g.CurrentLoc = *loc
+			g.SystemStack = thg.SystemStack
+		}
+		if g.Status != Gdead {
+			allg = append(allg, g)
+		}
+	}
+	dbp.Common().allGCache = allg
+
+	return allg, nil
+}
+
+// FindGoroutine returns a G struct representing the goroutine
+// specified by `gid`.
+func FindGoroutine(dbp Process, gid int) (*G, error) {
+	if gid == -1 {
+		return dbp.SelectedGoroutine(), nil
+	}
+
+	gs, err := GoroutinesInfo(dbp)
+	if err != nil {
+		return nil, err
+	}
+	for i := range gs {
+		if gs[i].ID == gid {
+			if gs[i].Unreadable != nil {
+				return nil, gs[i].Unreadable
+			}
+			return gs[i], nil
+		}
+	}
+	return nil, fmt.Errorf("Unknown goroutine %d", gid)
+}
+
+// ConvertEvalScope returns a new EvalScope in the context of the
+// specified goroutine ID and stack frame.
+func ConvertEvalScope(dbp Process, gid, frame int) (*EvalScope, error) {
+	if _, err := dbp.Valid(); err != nil {
+		return nil, err
+	}
+	ct := dbp.CurrentThread()
+	g, err := FindGoroutine(dbp, gid)
+	if err != nil {
+		return nil, err
+	}
+	if g == nil {
+		return ThreadScope(ct)
+	}
+
+	var thread MemoryReadWriter
+	if g.Thread == nil {
+		thread = ct
+	} else {
+		thread = g.Thread
+	}
+
+	locs, err := g.Stacktrace(frame+1, false)
+	if err != nil {
+		return nil, err
+	}
+
+	if frame >= len(locs) {
+		return nil, fmt.Errorf("Frame %d does not exist in goroutine %d", frame, gid)
+	}
+
+	return FrameToScope(dbp.BinInfo(), thread, g, locs[frame:]...), nil
+}
+
+// FrameToScope returns a new EvalScope for frames[0].
+// If frames has at least two elements all memory between
+// frames[0].Regs.SP() and frames[1].Regs.CFA will be cached.
+// Otherwise all memory between frames[0].Regs.SP() and frames[0].Regs.CFA
+// will be cached.
+func FrameToScope(bi *BinaryInfo, thread MemoryReadWriter, g *G, frames ...Stackframe) *EvalScope {
+	var gvar *Variable
+	if g != nil {
+		gvar = g.variable
+	}
+
+	// Creates a cacheMem that will preload the entire stack frame the first
+	// time any local variable is read.
+	// Remember that the stack grows downward in memory.
+	minaddr := frames[0].Regs.SP()
+	var maxaddr uint64
+	if len(frames) > 1 && frames[0].SystemStack == frames[1].SystemStack {
+		maxaddr = uint64(frames[1].Regs.CFA)
+	} else {
+		maxaddr = uint64(frames[0].Regs.CFA)
+	}
+	if maxaddr > minaddr && maxaddr-minaddr < maxFramePrefetchSize {
+		thread = cacheMemory(thread, uintptr(minaddr), int(maxaddr-minaddr))
+	}
+
+	s := &EvalScope{Location: frames[0].Call, Regs: frames[0].Regs, Mem: thread, Gvar: gvar, BinInfo: bi, frameOffset: frames[0].FrameOffset()}
+	s.PC = frames[0].lastpc
+	return s
+}
+
+// CreateUnrecoveredPanicBreakpoint creates the unrecoverable-panic breakpoint.
+// This function is meant to be called by implementations of the Process interface.
+func CreateUnrecoveredPanicBreakpoint(p Process, writeBreakpoint writeBreakpointFn, breakpoints *BreakpointMap) {
+	panicpc, err := FindFunctionLocation(p, "runtime.startpanic", true, 0)
+	if _, isFnNotFound := err.(*ErrFunctionNotFound); isFnNotFound {
+		panicpc, err = FindFunctionLocation(p, "runtime.fatalpanic", true, 0)
+	}
+	if err == nil {
+		bp, err := breakpoints.SetWithID(-1, panicpc, writeBreakpoint)
+		if err == nil {
+			bp.Name = UnrecoveredPanic
+			bp.Variables = []string{"runtime.curg._panic.arg"}
+		}
+	}
+
+}
+
+// FirstPCAfterPrologue returns the address of the first
+// instruction after the prologue for function fn.
+// If sameline is set FirstPCAfterPrologue will always return an
+// address associated with the same line as fn.Entry.
+func FirstPCAfterPrologue(p Process, fn *Function, sameline bool) (uint64, error) {
+	pc, _, line, ok := fn.cu.lineInfo.PrologueEndPC(fn.Entry, fn.End)
+	if ok {
+		if !sameline {
+			return pc, nil
+		}
+		_, entryLine := fn.cu.lineInfo.PCToLine(fn.Entry, fn.Entry)
+		if entryLine == line {
+			return pc, nil
+		}
+	}
+
+	pc, err := firstPCAfterPrologueDisassembly(p, fn, sameline)
+	if err != nil {
+		return fn.Entry, err
+	}
+
+	if pc == fn.Entry {
+		// Look for the first instruction with the stmt flag set, so that setting a
+		// breakpoint with file:line and with the function name always result on
+		// the same instruction being selected.
+		entryFile, entryLine := fn.cu.lineInfo.PCToLine(fn.Entry, fn.Entry)
+		if pc, _, err := p.BinInfo().LineToPC(entryFile, entryLine); err == nil && pc >= fn.Entry && pc < fn.End {
+			return pc, nil
+		}
+	}
+
+	return pc, nil
+}

vendor/github.com/derekparker/delve/pkg/proc/registers.go

@@ -0,0 +1,348 @@
+package proc
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"math"
+	"os"
+	"strings"
+)
+
+// Registers is an interface for a generic register type. The
+// interface encapsulates the generic values / actions
+// we need independent of arch. The concrete register types
+// will be different depending on OS/Arch.
+type Registers interface {
+	PC() uint64
+	SP() uint64
+	BP() uint64
+	CX() uint64
+	TLS() uint64
+	// GAddr returns the address of the G variable if it is known, 0 and false otherwise
+	GAddr() (uint64, bool)
+	Get(int) (uint64, error)
+	Slice() []Register
+	// Copy returns a copy of the registers that is guaranteed not to change
+	// when the registers of the associated thread change.
+	Copy() Registers
+}
+
+// Register represents a CPU register.
+type Register struct {
+	Name  string
+	Bytes []byte
+	Value string
+}
+
+// AppendWordReg appends a word (16 bit) register to regs.
+func AppendWordReg(regs []Register, name string, value uint16) []Register {
+	var buf bytes.Buffer
+	binary.Write(&buf, binary.LittleEndian, value)
+	return append(regs, Register{name, buf.Bytes(), fmt.Sprintf("%#04x", value)})
+}
+
+// AppendDwordReg appends a double word (32 bit) register to regs.
+func AppendDwordReg(regs []Register, name string, value uint32) []Register {
+	var buf bytes.Buffer
+	binary.Write(&buf, binary.LittleEndian, value)
+	return append(regs, Register{name, buf.Bytes(), fmt.Sprintf("%#08x", value)})
+}
+
+// AppendQwordReg appends a quad word (64 bit) register to regs.
+func AppendQwordReg(regs []Register, name string, value uint64) []Register {
+	var buf bytes.Buffer
+	binary.Write(&buf, binary.LittleEndian, value)
+	return append(regs, Register{name, buf.Bytes(), fmt.Sprintf("%#016x", value)})
+}
+
+func appendFlagReg(regs []Register, name string, value uint64, descr flagRegisterDescr, size int) []Register {
+	var buf bytes.Buffer
+	binary.Write(&buf, binary.LittleEndian, value)
+	return append(regs, Register{name, buf.Bytes()[:size], descr.Describe(value, size)})
+}
+
+// AppendEflagReg appends EFLAG register to regs.
+func AppendEflagReg(regs []Register, name string, value uint64) []Register {
+	return appendFlagReg(regs, name, value, eflagsDescription, 64)
+}
+
+// AppendMxcsrReg appends MXCSR register to regs.
+func AppendMxcsrReg(regs []Register, name string, value uint64) []Register {
+	return appendFlagReg(regs, name, value, mxcsrDescription, 32)
+}
+
+// AppendX87Reg appends a 80 bit float register to regs.
+func AppendX87Reg(regs []Register, index int, exponent uint16, mantissa uint64) []Register {
+	var f float64
+	fset := false
+
+	const (
+		_SIGNBIT    = 1 << 15
+		_EXP_BIAS   = (1 << 14) - 1 // 2^(n-1) - 1 = 16383
+		_SPECIALEXP = (1 << 15) - 1 // all bits set
+		_HIGHBIT    = 1 << 63
+		_QUIETBIT   = 1 << 62
+	)
+
+	sign := 1.0
+	if exponent&_SIGNBIT != 0 {
+		sign = -1.0
+	}
+	exponent &= ^uint16(_SIGNBIT)
+
+	NaN := math.NaN()
+	Inf := math.Inf(+1)
+
+	switch exponent {
+	case 0:
+		switch {
+		case mantissa == 0:
+			f = sign * 0.0
+			fset = true
+		case mantissa&_HIGHBIT != 0:
+			f = NaN
+			fset = true
+		}
+	case _SPECIALEXP:
+		switch {
+		case mantissa&_HIGHBIT == 0:
+			f = sign * Inf
+			fset = true
+		default:
+			f = NaN // signaling NaN
+			fset = true
+		}
+	default:
+		if mantissa&_HIGHBIT == 0 {
+			f = NaN
+			fset = true
+		}
+	}
+
+	if !fset {
+		significand := float64(mantissa) / (1 << 63)
+		f = sign * math.Ldexp(significand, int(exponent-_EXP_BIAS))
+	}
+
+	var buf bytes.Buffer
+	binary.Write(&buf, binary.LittleEndian, exponent)
+	binary.Write(&buf, binary.LittleEndian, mantissa)
+
+	return append(regs, Register{fmt.Sprintf("ST(%d)", index), buf.Bytes(), fmt.Sprintf("%#04x%016x\t%g", exponent, mantissa, f)})
+}
+
+// AppendSSEReg appends a 256 bit SSE register to regs.
+func AppendSSEReg(regs []Register, name string, xmm []byte) []Register {
+	buf := bytes.NewReader(xmm)
+
+	var out bytes.Buffer
+	var vi [16]uint8
+	for i := range vi {
+		binary.Read(buf, binary.LittleEndian, &vi[i])
+	}
+
+	fmt.Fprintf(&out, "0x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", vi[15], vi[14], vi[13], vi[12], vi[11], vi[10], vi[9], vi[8], vi[7], vi[6], vi[5], vi[4], vi[3], vi[2], vi[1], vi[0])
+
+	fmt.Fprintf(&out, "\tv2_int={ %02x%02x%02x%02x%02x%02x%02x%02x %02x%02x%02x%02x%02x%02x%02x%02x }", vi[7], vi[6], vi[5], vi[4], vi[3], vi[2], vi[1], vi[0], vi[15], vi[14], vi[13], vi[12], vi[11], vi[10], vi[9], vi[8])
+
+	fmt.Fprintf(&out, "\tv4_int={ %02x%02x%02x%02x %02x%02x%02x%02x %02x%02x%02x%02x %02x%02x%02x%02x }", vi[3], vi[2], vi[1], vi[0], vi[7], vi[6], vi[5], vi[4], vi[11], vi[10], vi[9], vi[8], vi[15], vi[14], vi[13], vi[12])
+
+	fmt.Fprintf(&out, "\tv8_int={ %02x%02x %02x%02x %02x%02x %02x%02x %02x%02x %02x%02x %02x%02x %02x%02x }", vi[1], vi[0], vi[3], vi[2], vi[5], vi[4], vi[7], vi[6], vi[9], vi[8], vi[11], vi[10], vi[13], vi[12], vi[15], vi[14])
+
+	fmt.Fprintf(&out, "\tv16_int={ %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x }", vi[0], vi[1], vi[2], vi[3], vi[4], vi[5], vi[6], vi[7], vi[8], vi[9], vi[10], vi[11], vi[12], vi[13], vi[14], vi[15])
+
+	buf.Seek(0, os.SEEK_SET)
+	var v2 [2]float64
+	for i := range v2 {
+		binary.Read(buf, binary.LittleEndian, &v2[i])
+	}
+	fmt.Fprintf(&out, "\tv2_float={ %g %g }", v2[0], v2[1])
+
+	buf.Seek(0, os.SEEK_SET)
+	var v4 [4]float32
+	for i := range v4 {
+		binary.Read(buf, binary.LittleEndian, &v4[i])
+	}
+	fmt.Fprintf(&out, "\tv4_float={ %g %g %g %g }", v4[0], v4[1], v4[2], v4[3])
+
+	return append(regs, Register{name, xmm, out.String()})
+}
+
+// ErrUnknownRegister is returned when the value of an unknown
+// register is requested.
+var ErrUnknownRegister = errors.New("unknown register")
+
+type flagRegisterDescr []flagDescr
+type flagDescr struct {
+	name string
+	mask uint64
+}
+
+var mxcsrDescription flagRegisterDescr = []flagDescr{
+	{"FZ", 1 << 15},
+	{"RZ/RN", 1<<14 | 1<<13},
+	{"PM", 1 << 12},
+	{"UM", 1 << 11},
+	{"OM", 1 << 10},
+	{"ZM", 1 << 9},
+	{"DM", 1 << 8},
+	{"IM", 1 << 7},
+	{"DAZ", 1 << 6},
+	{"PE", 1 << 5},
+	{"UE", 1 << 4},
+	{"OE", 1 << 3},
+	{"ZE", 1 << 2},
+	{"DE", 1 << 1},
+	{"IE", 1 << 0},
+}
+
+var eflagsDescription flagRegisterDescr = []flagDescr{
+	{"CF", 1 << 0},
+	{"", 1 << 1},
+	{"PF", 1 << 2},
+	{"AF", 1 << 4},
+	{"ZF", 1 << 6},
+	{"SF", 1 << 7},
+	{"TF", 1 << 8},
+	{"IF", 1 << 9},
+	{"DF", 1 << 10},
+	{"OF", 1 << 11},
+	{"IOPL", 1<<12 | 1<<13},
+	{"NT", 1 << 14},
+	{"RF", 1 << 16},
+	{"VM", 1 << 17},
+	{"AC", 1 << 18},
+	{"VIF", 1 << 19},
+	{"VIP", 1 << 20},
+	{"ID", 1 << 21},
+}
+
+func (descr flagRegisterDescr) Mask() uint64 {
+	var r uint64
+	for _, f := range descr {
+		r = r | f.mask
+	}
+	return r
+}
+
+func (descr flagRegisterDescr) Describe(reg uint64, bitsize int) string {
+	var r []string
+	for _, f := range descr {
+		if f.name == "" {
+			continue
+		}
+		// rbm is f.mask with only the right-most bit set:
+		// 0001 1100 -> 0000 0100
+		rbm := f.mask & -f.mask
+		if rbm == f.mask {
+			if reg&f.mask != 0 {
+				r = append(r, f.name)
+			}
+		} else {
+			x := (reg & f.mask) >> uint64(math.Log2(float64(rbm)))
+			r = append(r, fmt.Sprintf("%s=%x", f.name, x))
+		}
+	}
+	if reg & ^descr.Mask() != 0 {
+		r = append(r, fmt.Sprintf("unknown_flags=%x", reg&^descr.Mask()))
+	}
+	return fmt.Sprintf("%#0*x\t[%s]", bitsize/4, reg, strings.Join(r, " "))
+}
+
+// PtraceFpRegs tracks user_fpregs_struct in /usr/include/x86_64-linux-gnu/sys/user.h
+type PtraceFpRegs struct {
+	Cwd      uint16
+	Swd      uint16
+	Ftw      uint16
+	Fop      uint16
+	Rip      uint64
+	Rdp      uint64
+	Mxcsr    uint32
+	MxcrMask uint32
+	StSpace  [32]uint32
+	XmmSpace [256]byte
+	Padding  [24]uint32
+}
+
+// LinuxX86Xstate represents amd64 XSAVE area. See Section 13.1 (and
+// following) of Intel® 64 and IA-32 Architectures Software Developer’s
+// Manual, Volume 1: Basic Architecture.
+type LinuxX86Xstate struct {
+	PtraceFpRegs
+	Xsave    []byte // raw xsave area
+	AvxState bool   // contains AVX state
+	YmmSpace [256]byte
+}
+
+// Decode decodes an XSAVE area to a list of name/value pairs of registers.
+func (xsave *LinuxX86Xstate) Decode() (regs []Register) {
+	// x87 registers
+	regs = AppendWordReg(regs, "CW", xsave.Cwd)
+	regs = AppendWordReg(regs, "SW", xsave.Swd)
+	regs = AppendWordReg(regs, "TW", xsave.Ftw)
+	regs = AppendWordReg(regs, "FOP", xsave.Fop)
+	regs = AppendQwordReg(regs, "FIP", xsave.Rip)
+	regs = AppendQwordReg(regs, "FDP", xsave.Rdp)
+
+	for i := 0; i < len(xsave.StSpace); i += 4 {
+		regs = AppendX87Reg(regs, i/4, uint16(xsave.StSpace[i+2]), uint64(xsave.StSpace[i+1])<<32|uint64(xsave.StSpace[i]))
+	}
+
+	// SSE registers
+	regs = AppendMxcsrReg(regs, "MXCSR", uint64(xsave.Mxcsr))
+	regs = AppendDwordReg(regs, "MXCSR_MASK", xsave.MxcrMask)
+
+	for i := 0; i < len(xsave.XmmSpace); i += 16 {
+		regs = AppendSSEReg(regs, fmt.Sprintf("XMM%d", i/16), xsave.XmmSpace[i:i+16])
+		if xsave.AvxState {
+			regs = AppendSSEReg(regs, fmt.Sprintf("YMM%d", i/16), xsave.YmmSpace[i:i+16])
+		}
+	}
+
+	return
+}
+
+const (
+	_XSAVE_HEADER_START          = 512
+	_XSAVE_HEADER_LEN            = 64
+	_XSAVE_EXTENDED_REGION_START = 576
+	_XSAVE_SSE_REGION_LEN        = 416
+)
+
+// LinuxX86XstateRead reads a byte array containing an XSAVE area into regset.
+// If readLegacy is true regset.PtraceFpRegs will be filled with the
+// contents of the legacy region of the XSAVE area.
+// See Section 13.1 (and following) of Intel® 64 and IA-32 Architectures
+// Software Developer’s Manual, Volume 1: Basic Architecture.
+func LinuxX86XstateRead(xstateargs []byte, readLegacy bool, regset *LinuxX86Xstate) error {
+	if _XSAVE_HEADER_START+_XSAVE_HEADER_LEN >= len(xstateargs) {
+		return nil
+	}
+	if readLegacy {
+		rdr := bytes.NewReader(xstateargs[:_XSAVE_HEADER_START])
+		if err := binary.Read(rdr, binary.LittleEndian, &regset.PtraceFpRegs); err != nil {
+			return err
+		}
+	}
+	xsaveheader := xstateargs[_XSAVE_HEADER_START : _XSAVE_HEADER_START+_XSAVE_HEADER_LEN]
+	xstate_bv := binary.LittleEndian.Uint64(xsaveheader[0:8])
+	xcomp_bv := binary.LittleEndian.Uint64(xsaveheader[8:16])
+
+	if xcomp_bv&(1<<63) != 0 {
+		// compact format not supported
+		return nil
+	}
+
+	if xstate_bv&(1<<2) == 0 {
+		// AVX state not present
+		return nil
+	}
+
+	avxstate := xstateargs[_XSAVE_EXTENDED_REGION_START:]
+	regset.AvxState = true
+	copy(regset.YmmSpace[:], avxstate[:len(regset.YmmSpace)])
+
+	return nil
+}

vendor/github.com/derekparker/delve/pkg/proc/registers_amd64.go

@@ -0,0 +1,90 @@
+package proc
+
+import (
+	"bytes"
+	"encoding/binary"
+
+	"golang.org/x/arch/x86/x86asm"
+)
+
+var dwarfToAsm = map[int]x86asm.Reg{
+	0:  x86asm.RAX,
+	1:  x86asm.RDX,
+	2:  x86asm.RCX,
+	3:  x86asm.RBX,
+	4:  x86asm.RSI,
+	5:  x86asm.RDI,
+	6:  x86asm.RBP,
+	7:  x86asm.RSP,
+	8:  x86asm.R8,
+	9:  x86asm.R9,
+	10: x86asm.R10,
+	11: x86asm.R11,
+	12: x86asm.R12,
+	13: x86asm.R13,
+	14: x86asm.R14,
+	15: x86asm.R15,
+	16: x86asm.RIP,
+}
+
+var dwarfToName = map[int]string{
+	17: "XMM0",
+	18: "XMM1",
+	19: "XMM2",
+	20: "XMM3",
+	21: "XMM4",
+	22: "XMM5",
+	23: "XMM6",
+	24: "XMM7",
+	25: "XMM8",
+	26: "XMM9",
+	27: "XMM10",
+	28: "XMM11",
+	29: "XMM12",
+	30: "XMM13",
+	31: "XMM14",
+	32: "XMM15",
+	33: "ST(0)",
+	34: "ST(1)",
+	35: "ST(2)",
+	36: "ST(3)",
+	37: "ST(4)",
+	38: "ST(5)",
+	39: "ST(6)",
+	40: "ST(7)",
+	49: "Eflags",
+	50: "Es",
+	51: "Cs",
+	52: "Ss",
+	53: "Ds",
+	54: "Fs",
+	55: "Gs",
+	58: "Fs_base",
+	59: "Gs_base",
+	64: "MXCSR",
+	65: "CW",
+	66: "SW",
+}
+
+// GetDwarfRegister maps between DWARF register numbers and architecture
+// registers.
+// The mapping is specified in the System V ABI AMD64 Architecture Processor
+// Supplement page 57, figure 3.36
+// https://www.uclibc.org/docs/psABI-x86_64.pdf
+func GetDwarfRegister(regs Registers, i int) []byte {
+	if asmreg, ok := dwarfToAsm[i]; ok {
+		x, _ := regs.Get(int(asmreg))
+		var buf bytes.Buffer
+		binary.Write(&buf, binary.LittleEndian, x)
+		return buf.Bytes()
+	}
+	if regname, ok := dwarfToName[i]; ok {
+		regslice := regs.Slice()
+		for _, reg := range regslice {
+			if reg.Name == regname {
+				return reg.Bytes
+			}
+		}
+	}
+	return []byte{}
+}

vendor/github.com/derekparker/delve/pkg/proc/stack.go

@@ -0,0 +1,687 @@
+package proc
+
+import (
+	"debug/dwarf"
+	"errors"
+	"fmt"
+	"go/constant"
+	"strings"
+
+	"github.com/derekparker/delve/pkg/dwarf/frame"
+	"github.com/derekparker/delve/pkg/dwarf/op"
+	"github.com/derekparker/delve/pkg/dwarf/reader"
+)
+
+// This code is partly adapted from runtime.gentraceback in
+// $GOROOT/src/runtime/traceback.go
+
+// Stackframe represents a frame in a system stack.
+//
+// Each stack frame has two locations Current and Call.
+//
+// For the topmost stackframe Current and Call are the same location.
+//
+// For stackframes after the first Current is the location corresponding to
+// the return address and Call is the location of the CALL instruction that
+// was last executed on the frame. Note however that Call.PC is always equal
+// to Current.PC, because finding the correct value for Call.PC would
+// require disassembling each function in the stacktrace.
+//
+// For synthetic stackframes generated for inlined function calls Current.Fn
+// is the function containing the inlining and Call.Fn in the inlined
+// function.
+type Stackframe struct {
+	Current, Call Location
+
+	// Frame registers.
+	Regs op.DwarfRegisters
+	// High address of the stack.
+	stackHi uint64
+	// Return address for this stack frame (as read from the stack frame itself).
+	Ret uint64
+	// Address to the memory location containing the return address
+	addrret uint64
+	// Err is set if an error occurred during stacktrace
+	Err error
+	// SystemStack is true if this frame belongs to a system stack.
+	SystemStack bool
+	// Inlined is true if this frame is actually an inlined call.
+	Inlined bool
+	// Bottom is true if this is the bottom of the stack
+	Bottom bool
+
+	// lastpc is a memory address guaranteed to belong to the last instruction
+	// executed in this stack frame.
+	// For the topmost stack frame this will be the same as Current.PC and
+	// Call.PC, for other stack frames it will usually be Current.PC-1, but
+	// could be different when inlined calls are involved in the stacktrace.
+	// Note that this address isn't guaranteed to belong to the start of an
+	// instruction and, for this reason, should not be propagated outside of
+	// pkg/proc.
+	// Use this value to determine active lexical scopes for the stackframe.
+	lastpc uint64
+
+	// TopmostDefer is the defer that would be at the top of the stack when a
+	// panic unwind would get to this call frame, in other words it's the first
+	// deferred function that will  be called if the runtime unwinds past this
+	// call frame.
+	TopmostDefer *Defer
+
+	// Defers is the list of functions deferred by this stack frame (so far).
+	Defers []*Defer
+}
+
+// FrameOffset returns the address of the stack frame, absolute for system
+// stack frames or as an offset from stackhi for goroutine stacks (a
+// negative value).
+func (frame *Stackframe) FrameOffset() int64 {
+	if frame.SystemStack {
+		return frame.Regs.CFA
+	}
+	return frame.Regs.CFA - int64(frame.stackHi)
+}
+
+// FramePointerOffset returns the value of the frame pointer, absolute for
+// system stack frames or as an offset from stackhi for goroutine stacks (a
+// negative value).
+func (frame *Stackframe) FramePointerOffset() int64 {
+	if frame.SystemStack {
+		return int64(frame.Regs.BP())
+	}
+	return int64(frame.Regs.BP()) - int64(frame.stackHi)
+}
+
+// ThreadStacktrace returns the stack trace for thread.
+// Note the locations in the array are return addresses not call addresses.
+func ThreadStacktrace(thread Thread, depth int) ([]Stackframe, error) {
+	g, _ := GetG(thread)
+	if g == nil {
+		regs, err := thread.Registers(true)
+		if err != nil {
+			return nil, err
+		}
+		it := newStackIterator(thread.BinInfo(), thread, thread.BinInfo().Arch.RegistersToDwarfRegisters(regs, thread.BinInfo().staticBase), 0, nil, -1, nil)
+		return it.stacktrace(depth)
+	}
+	return g.Stacktrace(depth, false)
+}
+
+func (g *G) stackIterator() (*stackIterator, error) {
+	stkbar, err := g.stkbar()
+	if err != nil {
+		return nil, err
+	}
+
+	if g.Thread != nil {
+		regs, err := g.Thread.Registers(true)
+		if err != nil {
+			return nil, err
+		}
+		return newStackIterator(g.variable.bi, g.Thread, g.variable.bi.Arch.RegistersToDwarfRegisters(regs, g.variable.bi.staticBase), g.stackhi, stkbar, g.stkbarPos, g), nil
+	}
+	return newStackIterator(g.variable.bi, g.variable.mem, g.variable.bi.Arch.GoroutineToDwarfRegisters(g), g.stackhi, stkbar, g.stkbarPos, g), nil
+}
+
+// Stacktrace returns the stack trace for a goroutine.
+// Note the locations in the array are return addresses not call addresses.
+func (g *G) Stacktrace(depth int, readDefers bool) ([]Stackframe, error) {
+	it, err := g.stackIterator()
+	if err != nil {
+		return nil, err
+	}
+	frames, err := it.stacktrace(depth)
+	if err != nil {
+		return nil, err
+	}
+	if readDefers {
+		g.readDefers(frames)
+	}
+	return frames, nil
+}
+
+// NullAddrError is an error for a null address.
+type NullAddrError struct{}
+
+func (n NullAddrError) Error() string {
+	return "NULL address"
+}
+
+// stackIterator holds information
+// required to iterate and walk the program
+// stack.
+type stackIterator struct {
+	pc    uint64
+	top   bool
+	atend bool
+	frame Stackframe
+	bi    *BinaryInfo
+	mem   MemoryReadWriter
+	err   error
+
+	stackhi        uint64
+	systemstack    bool
+	stackBarrierPC uint64
+	stkbar         []savedLR
+
+	// regs is the register set for the current frame
+	regs op.DwarfRegisters
+
+	g           *G     // the goroutine being stacktraced, nil if we are stacktracing a goroutine-less thread
+	g0_sched_sp uint64 // value of g0.sched.sp (see comments around its use)
+
+	dwarfReader *dwarf.Reader
+}
+
+type savedLR struct {
+	ptr uint64
+	val uint64
+}
+
+func newStackIterator(bi *BinaryInfo, mem MemoryReadWriter, regs op.DwarfRegisters, stackhi uint64, stkbar []savedLR, stkbarPos int, g *G) *stackIterator {
+	stackBarrierFunc := bi.LookupFunc["runtime.stackBarrier"] // stack barriers were removed in Go 1.9
+	var stackBarrierPC uint64
+	if stackBarrierFunc != nil && stkbar != nil {
+		stackBarrierPC = stackBarrierFunc.Entry
+		fn := bi.PCToFunc(regs.PC())
+		if fn != nil && fn.Name == "runtime.stackBarrier" {
+			// We caught the goroutine as it's executing the stack barrier, we must
+			// determine whether or not g.stackPos has already been incremented or not.
+			if len(stkbar) > 0 && stkbar[stkbarPos].ptr < regs.SP() {
+				// runtime.stackBarrier has not incremented stkbarPos.
+			} else if stkbarPos > 0 && stkbar[stkbarPos-1].ptr < regs.SP() {
+				// runtime.stackBarrier has incremented stkbarPos.
+				stkbarPos--
+			} else {
+				return &stackIterator{err: fmt.Errorf("failed to unwind through stackBarrier at SP %x", regs.SP())}
+			}
+		}
+		stkbar = stkbar[stkbarPos:]
+	}
+	var g0_sched_sp uint64
+	systemstack := true
+	if g != nil {
+		systemstack = g.SystemStack
+		g0var, _ := g.variable.fieldVariable("m").structMember("g0")
+		if g0var != nil {
+			g0, _ := g0var.parseG()
+			if g0 != nil {
+				g0_sched_sp = g0.SP
+			}
+		}
+	}
+	return &stackIterator{pc: regs.PC(), regs: regs, top: true, bi: bi, mem: mem, err: nil, atend: false, stackhi: stackhi, stackBarrierPC: stackBarrierPC, stkbar: stkbar, systemstack: systemstack, g: g, g0_sched_sp: g0_sched_sp, dwarfReader: bi.dwarf.Reader()}
+}
+
+// Next points the iterator to the next stack frame.
+func (it *stackIterator) Next() bool {
+	if it.err != nil || it.atend {
+		return false
+	}
+	callFrameRegs, ret, retaddr := it.advanceRegs()
+	it.frame = it.newStackframe(ret, retaddr)
+
+	if it.stkbar != nil && it.frame.Ret == it.stackBarrierPC && it.frame.addrret == it.stkbar[0].ptr {
+		// Skip stack barrier frames
+		it.frame.Ret = it.stkbar[0].val
+		it.stkbar = it.stkbar[1:]
+	}
+
+	if it.switchStack() {
+		return true
+	}
+
+	if it.frame.Ret <= 0 {
+		it.atend = true
+		return true
+	}
+
+	it.top = false
+	it.pc = it.frame.Ret
+	it.regs = callFrameRegs
+	return true
+}
+
+// asmcgocallSPOffsetSaveSlot is the offset from systemstack.SP where
+// (goroutine.SP - StackHi) is saved in runtime.asmcgocall after the stack
+// switch happens.
+const asmcgocallSPOffsetSaveSlot = 0x28
+
+// switchStack will use the current frame to determine if it's time to
+// switch between the system stack and the goroutine stack or vice versa.
+// Sets it.atend when the top of the stack is reached.
+func (it *stackIterator) switchStack() bool {
+	if it.frame.Current.Fn == nil {
+		return false
+	}
+	switch it.frame.Current.Fn.Name {
+	case "runtime.asmcgocall":
+		if it.top || !it.systemstack {
+			return false
+		}
+
+		// This function is called by a goroutine to execute a C function and
+		// switches from the goroutine stack to the system stack.
+		// Since we are unwinding the stack from callee to caller we have  switch
+		// from the system stack to the goroutine stack.
+
+		off, _ := readIntRaw(it.mem, uintptr(it.regs.SP()+asmcgocallSPOffsetSaveSlot), int64(it.bi.Arch.PtrSize())) // reads "offset of SP from StackHi" from where runtime.asmcgocall saved it
+		oldsp := it.regs.SP()
+		it.regs.Reg(it.regs.SPRegNum).Uint64Val = uint64(int64(it.stackhi) - off)
+
+		// runtime.asmcgocall can also be called from inside the system stack,
+		// in that case no stack switch actually happens
+		if it.regs.SP() == oldsp {
+			return false
+		}
+		it.systemstack = false
+
+		// advances to the next frame in the call stack
+		it.frame.addrret = uint64(int64(it.regs.SP()) + int64(it.bi.Arch.PtrSize()))
+		it.frame.Ret, _ = readUintRaw(it.mem, uintptr(it.frame.addrret), int64(it.bi.Arch.PtrSize()))
+		it.pc = it.frame.Ret
+
+		it.top = false
+		return true
+
+	case "runtime.cgocallback_gofunc":
+		// For a detailed description of how this works read the long comment at
+		// the start of $GOROOT/src/runtime/cgocall.go and the source code of
+		// runtime.cgocallback_gofunc in $GOROOT/src/runtime/asm_amd64.s
+		//
+		// When a C functions calls back into go it will eventually call into
+		// runtime.cgocallback_gofunc which is the function that does the stack
+		// switch from the system stack back into the goroutine stack
+		// Since we are going backwards on the stack here we see the transition
+		// as goroutine stack -> system stack.
+
+		if it.top || it.systemstack {
+			return false
+		}
+
+		if it.g0_sched_sp <= 0 {
+			return false
+		}
+		// entering the system stack
+		it.regs.Reg(it.regs.SPRegNum).Uint64Val = it.g0_sched_sp
+		// reads the previous value of g0.sched.sp that runtime.cgocallback_gofunc saved on the stack
+		it.g0_sched_sp, _ = readUintRaw(it.mem, uintptr(it.regs.SP()), int64(it.bi.Arch.PtrSize()))
+		it.top = false
+		callFrameRegs, ret, retaddr := it.advanceRegs()
+		frameOnSystemStack := it.newStackframe(ret, retaddr)
+		it.pc = frameOnSystemStack.Ret
+		it.regs = callFrameRegs
+		it.systemstack = true
+		return true
+
+	case "runtime.goexit", "runtime.rt0_go", "runtime.mcall":
+		// Look for "top of stack" functions.
+		it.atend = true
+		return true
+
+	default:
+		if it.systemstack && it.top && it.g != nil && strings.HasPrefix(it.frame.Current.Fn.Name, "runtime.") {
+			// The runtime switches to the system stack in multiple places.
+			// This usually happens through a call to runtime.systemstack but there
+			// are functions that switch to the system stack manually (for example
+			// runtime.morestack).
+			// Since we are only interested in printing the system stack for cgo
+			// calls we switch directly to the goroutine stack if we detect that the
+			// function at the top of the stack is a runtime function.
+			it.systemstack = false
+			it.top = false
+			it.pc = it.g.PC
+			it.regs.Reg(it.regs.SPRegNum).Uint64Val = it.g.SP
+			it.regs.Reg(it.regs.BPRegNum).Uint64Val = it.g.BP
+			return true
+		}
+
+		return false
+	}
+}
+
+// Frame returns the frame the iterator is pointing at.
+func (it *stackIterator) Frame() Stackframe {
+	it.frame.Bottom = it.atend
+	return it.frame
+}
+
+// Err returns the error encountered during stack iteration.
+func (it *stackIterator) Err() error {
+	return it.err
+}
+
+// frameBase calculates the frame base pseudo-register for DWARF for fn and
+// the current frame.
+func (it *stackIterator) frameBase(fn *Function) int64 {
+	it.dwarfReader.Seek(fn.offset)
+	e, err := it.dwarfReader.Next()
+	if err != nil {
+		return 0
+	}
+	fb, _, _, _ := it.bi.Location(e, dwarf.AttrFrameBase, it.pc, it.regs)
+	return fb
+}
+
+func (it *stackIterator) newStackframe(ret, retaddr uint64) Stackframe {
+	if retaddr == 0 {
+		it.err = NullAddrError{}
+		return Stackframe{}
+	}
+	f, l, fn := it.bi.PCToLine(it.pc)
+	if fn == nil {
+		f = "?"
+		l = -1
+	} else {
+		it.regs.FrameBase = it.frameBase(fn)
+	}
+	r := Stackframe{Current: Location{PC: it.pc, File: f, Line: l, Fn: fn}, Regs: it.regs, Ret: ret, addrret: retaddr, stackHi: it.stackhi, SystemStack: it.systemstack, lastpc: it.pc}
+	if !it.top {
+		fnname := ""
+		if r.Current.Fn != nil {
+			fnname = r.Current.Fn.Name
+		}
+		switch fnname {
+		case "runtime.mstart", "runtime.systemstack_switch":
+			// these frames are inserted by runtime.systemstack and there is no CALL
+			// instruction to look for at pc - 1
+			r.Call = r.Current
+		default:
+			if r.Current.Fn != nil && it.pc == r.Current.Fn.Entry {
+				// if the return address is the entry point of the function that
+				// contains it then this is some kind of fake return frame (for example
+				// runtime.sigreturn) that didn't actually call the current frame,
+				// attempting to get the location of the CALL instruction would just
+				// obfuscate what's going on, since there is no CALL instruction.
+				r.Call = r.Current
+			} else {
+				r.lastpc = it.pc - 1
+				r.Call.File, r.Call.Line, r.Call.Fn = it.bi.PCToLine(it.pc - 1)
+				if r.Call.Fn == nil {
+					r.Call.File = "?"
+					r.Call.Line = -1
+				}
+				r.Call.PC = r.Current.PC
+			}
+		}
+	} else {
+		r.Call = r.Current
+	}
+	return r
+}
+
+func (it *stackIterator) stacktrace(depth int) ([]Stackframe, error) {
+	if depth < 0 {
+		return nil, errors.New("negative maximum stack depth")
+	}
+	frames := make([]Stackframe, 0, depth+1)
+	for it.Next() {
+		frames = it.appendInlineCalls(frames, it.Frame())
+		if len(frames) >= depth+1 {
+			break
+		}
+	}
+	if err := it.Err(); err != nil {
+		if len(frames) == 0 {
+			return nil, err
+		}
+		frames = append(frames, Stackframe{Err: err})
+	}
+	return frames, nil
+}
+
+func (it *stackIterator) appendInlineCalls(frames []Stackframe, frame Stackframe) []Stackframe {
+	if frame.Call.Fn == nil {
+		return append(frames, frame)
+	}
+	if frame.Call.Fn.cu.lineInfo == nil {
+		return append(frames, frame)
+	}
+
+	callpc := frame.Call.PC
+	if len(frames) > 0 {
+		callpc--
+	}
+
+	irdr := reader.InlineStack(it.bi.dwarf, frame.Call.Fn.offset, reader.ToRelAddr(callpc, it.bi.staticBase))
+	for irdr.Next() {
+		entry, offset := reader.LoadAbstractOrigin(irdr.Entry(), it.dwarfReader)
+
+		fnname, okname := entry.Val(dwarf.AttrName).(string)
+		fileidx, okfileidx := entry.Val(dwarf.AttrCallFile).(int64)
+		line, okline := entry.Val(dwarf.AttrCallLine).(int64)
+
+		if !okname || !okfileidx || !okline {
+			break
+		}
+		if fileidx-1 < 0 || fileidx-1 >= int64(len(frame.Current.Fn.cu.lineInfo.FileNames)) {
+			break
+		}
+
+		inlfn := &Function{Name: fnname, Entry: frame.Call.Fn.Entry, End: frame.Call.Fn.End, offset: offset, cu: frame.Call.Fn.cu}
+		frames = append(frames, Stackframe{
+			Current: frame.Current,
+			Call: Location{
+				frame.Call.PC,
+				frame.Call.File,
+				frame.Call.Line,
+				inlfn,
+			},
+			Regs:        frame.Regs,
+			stackHi:     frame.stackHi,
+			Ret:         frame.Ret,
+			addrret:     frame.addrret,
+			Err:         frame.Err,
+			SystemStack: frame.SystemStack,
+			Inlined:     true,
+			lastpc:      frame.lastpc,
+		})
+
+		frame.Call.File = frame.Current.Fn.cu.lineInfo.FileNames[fileidx-1].Path
+		frame.Call.Line = int(line)
+	}
+
+	return append(frames, frame)
+}
+
+// advanceRegs calculates it.callFrameRegs using it.regs and the frame
+// descriptor entry for the current stack frame.
+// it.regs.CallFrameCFA is updated.
+func (it *stackIterator) advanceRegs() (callFrameRegs op.DwarfRegisters, ret uint64, retaddr uint64) {
+	fde, err := it.bi.frameEntries.FDEForPC(it.pc)
+	var framectx *frame.FrameContext
+	if _, nofde := err.(*frame.ErrNoFDEForPC); nofde {
+		framectx = it.bi.Arch.FixFrameUnwindContext(nil, it.pc, it.bi)
+	} else {
+		framectx = it.bi.Arch.FixFrameUnwindContext(fde.EstablishFrame(it.pc), it.pc, it.bi)
+	}
+
+	cfareg, err := it.executeFrameRegRule(0, framectx.CFA, 0)
+	if cfareg == nil {
+		it.err = fmt.Errorf("CFA becomes undefined at PC %#x", it.pc)
+		return op.DwarfRegisters{StaticBase: it.bi.staticBase}, 0, 0
+	}
+	it.regs.CFA = int64(cfareg.Uint64Val)
+
+	callFrameRegs = op.DwarfRegisters{StaticBase: it.bi.staticBase, ByteOrder: it.regs.ByteOrder, PCRegNum: it.regs.PCRegNum, SPRegNum: it.regs.SPRegNum, BPRegNum: it.regs.BPRegNum}
+
+	// According to the standard the compiler should be responsible for emitting
+	// rules for the RSP register so that it can then be used to calculate CFA,
+	// however neither Go nor GCC do this.
+	// In the following line we copy GDB's behaviour by assuming this is
+	// implicit.
+	// See also the comment in dwarf2_frame_default_init in
+	// $GDB_SOURCE/dwarf2-frame.c
+	callFrameRegs.AddReg(uint64(amd64DwarfSPRegNum), cfareg)
+
+	for i, regRule := range framectx.Regs {
+		reg, err := it.executeFrameRegRule(i, regRule, it.regs.CFA)
+		callFrameRegs.AddReg(i, reg)
+		if i == framectx.RetAddrReg {
+			if reg == nil {
+				if err == nil {
+					err = fmt.Errorf("Undefined return address at %#x", it.pc)
+				}
+				it.err = err
+			} else {
+				ret = reg.Uint64Val
+			}
+			retaddr = uint64(it.regs.CFA + regRule.Offset)
+		}
+	}
+
+	return callFrameRegs, ret, retaddr
+}
+
+func (it *stackIterator) executeFrameRegRule(regnum uint64, rule frame.DWRule, cfa int64) (*op.DwarfRegister, error) {
+	switch rule.Rule {
+	default:
+		fallthrough
+	case frame.RuleUndefined:
+		return nil, nil
+	case frame.RuleSameVal:
+		reg := *it.regs.Reg(regnum)
+		return &reg, nil
+	case frame.RuleOffset:
+		return it.readRegisterAt(regnum, uint64(cfa+rule.Offset))
+	case frame.RuleValOffset:
+		return op.DwarfRegisterFromUint64(uint64(cfa + rule.Offset)), nil
+	case frame.RuleRegister:
+		return it.regs.Reg(rule.Reg), nil
+	case frame.RuleExpression:
+		v, _, err := op.ExecuteStackProgram(it.regs, rule.Expression)
+		if err != nil {
+			return nil, err
+		}
+		return it.readRegisterAt(regnum, uint64(v))
+	case frame.RuleValExpression:
+		v, _, err := op.ExecuteStackProgram(it.regs, rule.Expression)
+		if err != nil {
+			return nil, err
+		}
+		return op.DwarfRegisterFromUint64(uint64(v)), nil
+	case frame.RuleArchitectural:
+		return nil, errors.New("architectural frame rules are unsupported")
+	case frame.RuleCFA:
+		if it.regs.Reg(rule.Reg) == nil {
+			return nil, nil
+		}
+		return op.DwarfRegisterFromUint64(uint64(int64(it.regs.Uint64Val(rule.Reg)) + rule.Offset)), nil
+	case frame.RuleFramePointer:
+		curReg := it.regs.Reg(rule.Reg)
+		if curReg == nil {
+			return nil, nil
+		}
+		if curReg.Uint64Val <= uint64(cfa) {
+			return it.readRegisterAt(regnum, curReg.Uint64Val)
+		}
+		newReg := *curReg
+		return &newReg, nil
+	}
+}
+
+func (it *stackIterator) readRegisterAt(regnum uint64, addr uint64) (*op.DwarfRegister, error) {
+	buf := make([]byte, it.bi.Arch.RegSize(regnum))
+	_, err := it.mem.ReadMemory(buf, uintptr(addr))
+	if err != nil {
+		return nil, err
+	}
+	return op.DwarfRegisterFromBytes(buf), nil
+}
+
+// Defer represents one deferred call
+type Defer struct {
+	DeferredPC uint64 // Value of field _defer.fn.fn, the deferred function
+	DeferPC    uint64 // PC address of instruction that added this defer
+	SP         uint64 // Value of SP register when this function was deferred (this field gets adjusted when the stack is moved to match the new stack space)
+	link       *Defer // Next deferred function
+
+	variable   *Variable
+	Unreadable error
+}
+
+// readDefers decorates the frames with the function deferred at each stack frame.
+func (g *G) readDefers(frames []Stackframe) {
+	curdefer := g.Defer()
+	i := 0
+
+	// scan simultaneously frames and the curdefer linked list, assigning
+	// defers to their associated frames.
+	for {
+		if curdefer == nil || i >= len(frames) {
+			return
+		}
+		if curdefer.Unreadable != nil {
+			// Current defer is unreadable, stick it into the first available frame
+			// (so that it can be reported to the user) and exit
+			frames[i].Defers = append(frames[i].Defers, curdefer)
+			return
+		}
+		if frames[i].Err != nil {
+			return
+		}
+
+		if frames[i].TopmostDefer == nil {
+			frames[i].TopmostDefer = curdefer
+		}
+
+		if frames[i].SystemStack || curdefer.SP >= uint64(frames[i].Regs.CFA) {
+			// frames[i].Regs.CFA is the value that SP had before the function of
+			// frames[i] was called.
+			// This means that when curdefer.SP == frames[i].Regs.CFA then curdefer
+			// was added by the previous frame.
+			//
+			// curdefer.SP < frames[i].Regs.CFA means curdefer was added by a
+			// function further down the stack.
+			//
+			// SystemStack frames live on a different physical stack and can't be
+			// compared with deferred frames.
+			i++
+		} else {
+			frames[i].Defers = append(frames[i].Defers, curdefer)
+			curdefer = curdefer.Next()
+		}
+	}
+}
+
+func (d *Defer) load() {
+	d.variable.loadValue(LoadConfig{false, 1, 0, 0, -1})
+	if d.variable.Unreadable != nil {
+		d.Unreadable = d.variable.Unreadable
+		return
+	}
+
+	fnvar := d.variable.fieldVariable("fn").maybeDereference()
+	if fnvar.Addr != 0 {
+		fnvar = fnvar.loadFieldNamed("fn")
+		if fnvar.Unreadable == nil {
+			d.DeferredPC, _ = constant.Uint64Val(fnvar.Value)
+		}
+	}
+
+	d.DeferPC, _ = constant.Uint64Val(d.variable.fieldVariable("pc").Value)
+	d.SP, _ = constant.Uint64Val(d.variable.fieldVariable("sp").Value)
+
+	linkvar := d.variable.fieldVariable("link").maybeDereference()
+	if linkvar.Addr != 0 {
+		d.link = &Defer{variable: linkvar}
+	}
+}
+
+// errSPDecreased is used when (*Defer).Next detects a corrupted linked
+// list, specifically when after followin a link pointer the value of SP
+// decreases rather than increasing or staying the same (the defer list is a
+// FIFO list, nodes further down the list have been added by function calls
+// further down the call stack and therefore the SP should always increase).
+var errSPDecreased = errors.New("corrupted defer list: SP decreased")
+
+// Next returns the next defer in the linked list
+func (d *Defer) Next() *Defer {
+	if d.link == nil {
+		return nil
+	}
+	d.link.load()
+	if d.link.SP < d.SP {
+		d.link.Unreadable = errSPDecreased
+	}
+	return d.link
+}

vendor/github.com/derekparker/delve/pkg/proc/threads.go

@@ -0,0 +1,568 @@
+package proc
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"go/ast"
+	"go/token"
+	"path/filepath"
+	"reflect"
+	"strings"
+
+	"github.com/derekparker/delve/pkg/dwarf/godwarf"
+	"github.com/derekparker/delve/pkg/dwarf/reader"
+)
+
+// Thread represents a thread.
+type Thread interface {
+	MemoryReadWriter
+	Location() (*Location, error)
+	// Breakpoint will return the breakpoint that this thread is stopped at or
+	// nil if the thread is not stopped at any breakpoint.
+	Breakpoint() BreakpointState
+	ThreadID() int
+
+	// Registers returns the CPU registers of this thread. The contents of the
+	// variable returned may or may not change to reflect the new CPU status
+	// when the thread is resumed or the registers are changed by calling
+	// SetPC/SetSP/etc.
+	// To insure that the the returned variable won't change call the Copy
+	// method of Registers.
+	Registers(floatingPoint bool) (Registers, error)
+
+	// RestoreRegisters restores saved registers
+	RestoreRegisters(Registers) error
+	Arch() Arch
+	BinInfo() *BinaryInfo
+	StepInstruction() error
+	// Blocked returns true if the thread is blocked
+	Blocked() bool
+	// SetCurrentBreakpoint updates the current breakpoint of this thread
+	SetCurrentBreakpoint() error
+	// Common returns the CommonThread structure for this thread
+	Common() *CommonThread
+
+	SetPC(uint64) error
+	SetSP(uint64) error
+	SetDX(uint64) error
+}
+
+// Location represents the location of a thread.
+// Holds information on the current instruction
+// address, the source file:line, and the function.
+type Location struct {
+	PC   uint64
+	File string
+	Line int
+	Fn   *Function
+}
+
+// ErrThreadBlocked is returned when the thread
+// is blocked in the scheduler.
+type ErrThreadBlocked struct{}
+
+func (tbe ErrThreadBlocked) Error() string {
+	return "thread blocked"
+}
+
+// CommonThread contains fields used by this package, common to all
+// implementations of the Thread interface.
+type CommonThread struct {
+	returnValues []*Variable
+}
+
+// ReturnValues reads the return values from the function executing on
+// this thread using the provided LoadConfig.
+func (t *CommonThread) ReturnValues(cfg LoadConfig) []*Variable {
+	loadValues(t.returnValues, cfg)
+	return t.returnValues
+}
+
+// topframe returns the two topmost frames of g, or thread if g is nil.
+func topframe(g *G, thread Thread) (Stackframe, Stackframe, error) {
+	var frames []Stackframe
+	var err error
+
+	if g == nil {
+		if thread.Blocked() {
+			return Stackframe{}, Stackframe{}, ErrThreadBlocked{}
+		}
+		frames, err = ThreadStacktrace(thread, 1)
+	} else {
+		frames, err = g.Stacktrace(1, true)
+	}
+	if err != nil {
+		return Stackframe{}, Stackframe{}, err
+	}
+	switch len(frames) {
+	case 0:
+		return Stackframe{}, Stackframe{}, errors.New("empty stack trace")
+	case 1:
+		return frames[0], Stackframe{}, nil
+	default:
+		return frames[0], frames[1], nil
+	}
+}
+
+// ErrNoSourceForPC is returned when the given address
+// does not correspond with a source file location.
+type ErrNoSourceForPC struct {
+	pc uint64
+}
+
+func (err *ErrNoSourceForPC) Error() string {
+	return fmt.Sprintf("no source for PC %#x", err.pc)
+}
+
+// Set breakpoints at every line, and the return address. Also look for
+// a deferred function and set a breakpoint there too.
+// If stepInto is true it will also set breakpoints inside all
+// functions called on the current source line, for non-absolute CALLs
+// a breakpoint of kind StepBreakpoint is set on the CALL instruction,
+// Continue will take care of setting a breakpoint to the destination
+// once the CALL is reached.
+//
+// Regardless of stepInto the following breakpoints will be set:
+// - a breakpoint on the first deferred function with NextDeferBreakpoint
+//   kind, the list of all the addresses to deferreturn calls in this function
+//   and condition checking that we remain on the same goroutine
+// - a breakpoint on each line of the function, with a condition checking
+//   that we stay on the same stack frame and goroutine.
+// - a breakpoint on the return address of the function, with a condition
+//   checking that we move to the previous stack frame and stay on the same
+//   goroutine.
+//
+// The breakpoint on the return address is *not* set if the current frame is
+// an inlined call. For inlined calls topframe.Current.Fn is the function
+// where the inlining happened and the second set of breakpoints will also
+// cover the "return address".
+//
+// If inlinedStepOut is true this function implements the StepOut operation
+// for an inlined function call. Everything works the same as normal except
+// when removing instructions belonging to inlined calls we also remove all
+// instructions belonging to the current inlined call.
+func next(dbp Process, stepInto, inlinedStepOut bool) error {
+	selg := dbp.SelectedGoroutine()
+	curthread := dbp.CurrentThread()
+	topframe, retframe, err := topframe(selg, curthread)
+	if err != nil {
+		return err
+	}
+
+	if topframe.Current.Fn == nil {
+		return &ErrNoSourceForPC{topframe.Current.PC}
+	}
+
+	// sanity check
+	if inlinedStepOut && !topframe.Inlined {
+		panic("next called with inlinedStepOut but topframe was not inlined")
+	}
+
+	success := false
+	defer func() {
+		if !success {
+			dbp.ClearInternalBreakpoints()
+		}
+	}()
+
+	ext := filepath.Ext(topframe.Current.File)
+	csource := ext != ".go" && ext != ".s"
+	var thread MemoryReadWriter = curthread
+	var regs Registers
+	if selg != nil && selg.Thread != nil {
+		thread = selg.Thread
+		regs, err = selg.Thread.Registers(false)
+		if err != nil {
+			return err
+		}
+	}
+
+	text, err := disassemble(thread, regs, dbp.Breakpoints(), dbp.BinInfo(), topframe.Current.Fn.Entry, topframe.Current.Fn.End, false)
+	if err != nil && stepInto {
+		return err
+	}
+
+	sameGCond := SameGoroutineCondition(selg)
+	retFrameCond := andFrameoffCondition(sameGCond, retframe.FrameOffset())
+	sameFrameCond := andFrameoffCondition(sameGCond, topframe.FrameOffset())
+	var sameOrRetFrameCond ast.Expr
+	if sameGCond != nil {
+		if topframe.Inlined {
+			sameOrRetFrameCond = sameFrameCond
+		} else {
+			sameOrRetFrameCond = &ast.BinaryExpr{
+				Op: token.LAND,
+				X:  sameGCond,
+				Y: &ast.BinaryExpr{
+					Op: token.LOR,
+					X:  frameoffCondition(topframe.FrameOffset()),
+					Y:  frameoffCondition(retframe.FrameOffset()),
+				},
+			}
+		}
+	}
+
+	if stepInto {
+		for _, instr := range text {
+			if instr.Loc.File != topframe.Current.File || instr.Loc.Line != topframe.Current.Line || !instr.IsCall() {
+				continue
+			}
+
+			if instr.DestLoc != nil && instr.DestLoc.Fn != nil {
+				if err := setStepIntoBreakpoint(dbp, []AsmInstruction{instr}, sameGCond); err != nil {
+					return err
+				}
+			} else {
+				// Non-absolute call instruction, set a StepBreakpoint here
+				if _, err := dbp.SetBreakpoint(instr.Loc.PC, StepBreakpoint, sameGCond); err != nil {
+					if _, ok := err.(BreakpointExistsError); !ok {
+						return err
+					}
+				}
+			}
+		}
+	}
+
+	if !csource {
+		deferreturns := []uint64{}
+
+		// Find all runtime.deferreturn locations in the function
+		// See documentation of Breakpoint.DeferCond for why this is necessary
+		for _, instr := range text {
+			if instr.IsCall() && instr.DestLoc != nil && instr.DestLoc.Fn != nil && instr.DestLoc.Fn.Name == "runtime.deferreturn" {
+				deferreturns = append(deferreturns, instr.Loc.PC)
+			}
+		}
+
+		// Set breakpoint on the most recently deferred function (if any)
+		var deferpc uint64
+		if topframe.TopmostDefer != nil && topframe.TopmostDefer.DeferredPC != 0 {
+			deferfn := dbp.BinInfo().PCToFunc(topframe.TopmostDefer.DeferredPC)
+			var err error
+			deferpc, err = FirstPCAfterPrologue(dbp, deferfn, false)
+			if err != nil {
+				return err
+			}
+		}
+		if deferpc != 0 && deferpc != topframe.Current.PC {
+			bp, err := dbp.SetBreakpoint(deferpc, NextDeferBreakpoint, sameGCond)
+			if err != nil {
+				if _, ok := err.(BreakpointExistsError); !ok {
+					return err
+				}
+			}
+			if bp != nil && stepInto {
+				bp.DeferReturns = deferreturns
+			}
+		}
+	}
+
+	// Add breakpoints on all the lines in the current function
+	pcs, err := topframe.Current.Fn.cu.lineInfo.AllPCsBetween(topframe.Current.Fn.Entry, topframe.Current.Fn.End-1, topframe.Current.File, topframe.Current.Line)
+	if err != nil {
+		return err
+	}
+
+	if !stepInto {
+		// Removing any PC range belonging to an inlined call
+		frame := topframe
+		if inlinedStepOut {
+			frame = retframe
+		}
+		pcs, err = removeInlinedCalls(dbp, pcs, frame)
+		if err != nil {
+			return err
+		}
+	}
+
+	if !csource {
+		var covered bool
+		for i := range pcs {
+			if topframe.Current.Fn.Entry <= pcs[i] && pcs[i] < topframe.Current.Fn.End {
+				covered = true
+				break
+			}
+		}
+
+		if !covered {
+			fn := dbp.BinInfo().PCToFunc(topframe.Ret)
+			if selg != nil && fn != nil && fn.Name == "runtime.goexit" {
+				return nil
+			}
+		}
+	}
+
+	for _, pc := range pcs {
+		if _, err := dbp.SetBreakpoint(pc, NextBreakpoint, sameFrameCond); err != nil {
+			if _, ok := err.(BreakpointExistsError); !ok {
+				dbp.ClearInternalBreakpoints()
+				return err
+			}
+		}
+
+	}
+	if !topframe.Inlined {
+		// Add a breakpoint on the return address for the current frame.
+		// For inlined functions there is no need to do this, the set of PCs
+		// returned by the AllPCsBetween call above already cover all instructions
+		// of the containing function.
+		bp, err := dbp.SetBreakpoint(topframe.Ret, NextBreakpoint, retFrameCond)
+		if err != nil {
+			if _, isexists := err.(BreakpointExistsError); isexists {
+				if bp.Kind == NextBreakpoint {
+					// If the return address shares the same address with one of the lines
+					// of the function (because we are stepping through a recursive
+					// function) then the corresponding breakpoint should be active both on
+					// this frame and on the return frame.
+					bp.Cond = sameOrRetFrameCond
+				}
+			}
+			// Return address could be wrong, if we are unable to set a breakpoint
+			// there it's ok.
+		}
+		if bp != nil {
+			configureReturnBreakpoint(dbp.BinInfo(), bp, &topframe, retFrameCond)
+		}
+	}
+
+	if bp := curthread.Breakpoint(); bp.Breakpoint == nil {
+		curthread.SetCurrentBreakpoint()
+	}
+	success = true
+	return nil
+}
+
+// Removes instructions belonging to inlined calls of topframe from pcs.
+// If includeCurrentFn is true it will also remove all instructions
+// belonging to the current function.
+func removeInlinedCalls(dbp Process, pcs []uint64, topframe Stackframe) ([]uint64, error) {
+	bi := dbp.BinInfo()
+	irdr := reader.InlineStack(bi.dwarf, topframe.Call.Fn.offset, 0)
+	for irdr.Next() {
+		e := irdr.Entry()
+		if e.Offset == topframe.Call.Fn.offset {
+			continue
+		}
+		ranges, err := bi.dwarf.Ranges(e)
+		if err != nil {
+			return pcs, err
+		}
+		for _, rng := range ranges {
+			pcs = removePCsBetween(pcs, rng[0], rng[1], bi.staticBase)
+		}
+		irdr.SkipChildren()
+	}
+	return pcs, irdr.Err()
+}
+
+func removePCsBetween(pcs []uint64, start, end, staticBase uint64) []uint64 {
+	out := pcs[:0]
+	for _, pc := range pcs {
+		if pc < start+staticBase || pc >= end+staticBase {
+			out = append(out, pc)
+		}
+	}
+	return out
+}
+
+func setStepIntoBreakpoint(dbp Process, text []AsmInstruction, cond ast.Expr) error {
+	if len(text) <= 0 {
+		return nil
+	}
+
+	instr := text[0]
+
+	if instr.DestLoc == nil || instr.DestLoc.Fn == nil {
+		return nil
+	}
+
+	fn := instr.DestLoc.Fn
+
+	// Ensure PC and Entry match, otherwise StepInto is likely to set
+	// its breakpoint before DestLoc.PC and hence run too far ahead.
+	// Calls to runtime.duffzero and duffcopy have this problem.
+	if fn.Entry != instr.DestLoc.PC {
+		return nil
+	}
+
+	// Skip unexported runtime functions
+	if strings.HasPrefix(fn.Name, "runtime.") && !isExportedRuntime(fn.Name) {
+		return nil
+	}
+
+	//TODO(aarzilli): if we want to let users hide functions
+	// or entire packages from being stepped into with 'step'
+	// those extra checks should be done here.
+
+	// Set a breakpoint after the function's prologue
+	pc, _ := FirstPCAfterPrologue(dbp, fn, false)
+	if _, err := dbp.SetBreakpoint(pc, NextBreakpoint, cond); err != nil {
+		if _, ok := err.(BreakpointExistsError); !ok {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func getGVariable(thread Thread) (*Variable, error) {
+	regs, err := thread.Registers(false)
+	if err != nil {
+		return nil, err
+	}
+
+	gaddr, hasgaddr := regs.GAddr()
+	if !hasgaddr {
+		gaddrbs := make([]byte, thread.Arch().PtrSize())
+		_, err := thread.ReadMemory(gaddrbs, uintptr(regs.TLS()+thread.BinInfo().GStructOffset()))
+		if err != nil {
+			return nil, err
+		}
+		gaddr = binary.LittleEndian.Uint64(gaddrbs)
+	}
+
+	return newGVariable(thread, uintptr(gaddr), thread.Arch().DerefTLS())
+}
+
+func newGVariable(thread Thread, gaddr uintptr, deref bool) (*Variable, error) {
+	typ, err := thread.BinInfo().findType("runtime.g")
+	if err != nil {
+		return nil, err
+	}
+
+	name := ""
+
+	if deref {
+		typ = &godwarf.PtrType{
+			CommonType: godwarf.CommonType{
+				ByteSize:    int64(thread.Arch().PtrSize()),
+				Name:        "",
+				ReflectKind: reflect.Ptr,
+				Offset:      0,
+			},
+			Type: typ,
+		}
+	} else {
+		name = "runtime.curg"
+	}
+
+	return newVariableFromThread(thread, name, gaddr, typ), nil
+}
+
+// GetG returns information on the G (goroutine) that is executing on this thread.
+//
+// The G structure for a thread is stored in thread local storage. Here we simply
+// calculate the address and read and parse the G struct.
+//
+// We cannot simply use the allg linked list in order to find the M that represents
+// the given OS thread and follow its G pointer because on Darwin mach ports are not
+// universal, so our port for this thread would not map to the `id` attribute of the M
+// structure. Also, when linked against libc, Go prefers the libc version of clone as
+// opposed to the runtime version. This has the consequence of not setting M.id for
+// any thread, regardless of OS.
+//
+// In order to get around all this craziness, we read the address of the G structure for
+// the current thread from the thread local storage area.
+func GetG(thread Thread) (*G, error) {
+	gaddr, err := getGVariable(thread)
+	if err != nil {
+		return nil, err
+	}
+
+	g, err := gaddr.parseG()
+	if err != nil {
+		return nil, err
+	}
+	if g.ID == 0 {
+		// The runtime uses a special goroutine with ID == 0 to mark that the
+		// current goroutine is executing on the system stack (sometimes also
+		// referred to as the g0 stack or scheduler stack, I'm not sure if there's
+		// actually any difference between those).
+		// For our purposes it's better if we always return the real goroutine
+		// since the rest of the code assumes the goroutine ID is univocal.
+		// The real 'current goroutine' is stored in g0.m.curg
+		curgvar, err := g.variable.fieldVariable("m").structMember("curg")
+		if err != nil {
+			return nil, err
+		}
+		g, err = curgvar.parseG()
+		if err != nil {
+			return nil, err
+		}
+		g.SystemStack = true
+	}
+	g.Thread = thread
+	if loc, err := thread.Location(); err == nil {
+		g.CurrentLoc = *loc
+	}
+	return g, nil
+}
+
+// ThreadScope returns an EvalScope for this thread.
+func ThreadScope(thread Thread) (*EvalScope, error) {
+	locations, err := ThreadStacktrace(thread, 1)
+	if err != nil {
+		return nil, err
+	}
+	if len(locations) < 1 {
+		return nil, errors.New("could not decode first frame")
+	}
+	return FrameToScope(thread.BinInfo(), thread, nil, locations...), nil
+}
+
+// GoroutineScope returns an EvalScope for the goroutine running on this thread.
+func GoroutineScope(thread Thread) (*EvalScope, error) {
+	locations, err := ThreadStacktrace(thread, 1)
+	if err != nil {
+		return nil, err
+	}
+	if len(locations) < 1 {
+		return nil, errors.New("could not decode first frame")
+	}
+	g, err := GetG(thread)
+	if err != nil {
+		return nil, err
+	}
+	return FrameToScope(thread.BinInfo(), thread, g, locations...), nil
+}
+
+// onNextGoroutine returns true if this thread is on the goroutine requested by the current 'next' command
+func onNextGoroutine(thread Thread, breakpoints *BreakpointMap) (bool, error) {
+	var bp *Breakpoint
+	for i := range breakpoints.M {
+		if breakpoints.M[i].Kind != UserBreakpoint && breakpoints.M[i].internalCond != nil {
+			bp = breakpoints.M[i]
+			break
+		}
+	}
+	if bp == nil {
+		return false, nil
+	}
+	// Internal breakpoint conditions can take multiple different forms:
+	// Step into breakpoints:
+	//   runtime.curg.goid == X
+	// Next or StepOut breakpoints:
+	//   runtime.curg.goid == X && runtime.frameoff == Y
+	// Breakpoints that can be hit either by stepping on a line in the same
+	// function or by returning from the function:
+	//   runtime.curg.goid == X && (runtime.frameoff == Y || runtime.frameoff == Z)
+	// Here we are only interested in testing the runtime.curg.goid clause.
+	w := onNextGoroutineWalker{thread: thread}
+	ast.Walk(&w, bp.internalCond)
+	return w.ret, w.err
+}
+
+type onNextGoroutineWalker struct {
+	thread Thread
+	ret    bool
+	err    error
+}
+
+func (w *onNextGoroutineWalker) Visit(n ast.Node) ast.Visitor {
+	if binx, isbin := n.(*ast.BinaryExpr); isbin && binx.Op == token.EQL && exprToString(binx.X) == "runtime.curg.goid" {
+		w.ret, w.err = evalBreakpointCondition(w.thread, n.(ast.Expr))
+		return nil
+	}
+	return w
+}

vendor/github.com/derekparker/delve/pkg/terminal/config.go

@@ -0,0 +1,191 @@
+package terminal
+
+import (
+	"fmt"
+	"os"
+	"reflect"
+	"strconv"
+	"strings"
+	"text/tabwriter"
+
+	"github.com/derekparker/delve/pkg/config"
+)
+
+func configureCmd(t *Term, ctx callContext, args string) error {
+	switch args {
+	case "-list":
+		return configureList(t)
+	case "-save":
+		return config.SaveConfig(t.conf)
+	case "":
+		return fmt.Errorf("wrong number of arguments to \"config\"")
+	default:
+		return configureSet(t, args)
+	}
+}
+
+type configureIterator struct {
+	cfgValue reflect.Value
+	cfgType  reflect.Type
+	i        int
+}
+
+func iterateConfiguration(conf *config.Config) *configureIterator {
+	cfgValue := reflect.ValueOf(conf).Elem()
+	cfgType := cfgValue.Type()
+
+	return &configureIterator{cfgValue, cfgType, -1}
+}
+
+func (it *configureIterator) Next() bool {
+	it.i++
+	return it.i < it.cfgValue.NumField()
+}
+
+func (it *configureIterator) Field() (name string, field reflect.Value) {
+	name = it.cfgType.Field(it.i).Tag.Get("yaml")
+	if comma := strings.Index(name, ","); comma >= 0 {
+		name = name[:comma]
+	}
+	field = it.cfgValue.Field(it.i)
+	return
+}
+
+func configureFindFieldByName(conf *config.Config, name string) reflect.Value {
+	it := iterateConfiguration(conf)
+	for it.Next() {
+		fieldName, field := it.Field()
+		if fieldName == name {
+			return field
+		}
+	}
+	return reflect.ValueOf(nil)
+}
+
+func configureList(t *Term) error {
+	w := new(tabwriter.Writer)
+	w.Init(os.Stdout, 0, 8, 1, ' ', 0)
+
+	it := iterateConfiguration(t.conf)
+	for it.Next() {
+		fieldName, field := it.Field()
+		if fieldName == "" {
+			continue
+		}
+
+		if field.Kind() == reflect.Ptr {
+			if !field.IsNil() {
+				fmt.Fprintf(w, "%s\t%v\n", fieldName, field.Elem())
+			} else {
+				fmt.Fprintf(w, "%s\t<not defined>\n", fieldName)
+			}
+		} else {
+			fmt.Fprintf(w, "%s\t%v\n", fieldName, field)
+		}
+	}
+	return w.Flush()
+}
+
+func configureSet(t *Term, args string) error {
+	v := strings.SplitN(args, " ", 2)
+
+	cfgname := v[0]
+	var rest string
+	if len(v) == 2 {
+		rest = v[1]
+	}
+
+	if cfgname == "alias" {
+		return configureSetAlias(t, rest)
+	}
+
+	field := configureFindFieldByName(t.conf, cfgname)
+	if !field.CanAddr() {
+		return fmt.Errorf("%q is not a configuration parameter", cfgname)
+	}
+
+	if field.Kind() == reflect.Slice && field.Type().Elem().Name() == "SubstitutePathRule" {
+		return configureSetSubstitutePath(t, rest)
+	}
+
+	simpleArg := func(typ reflect.Type) (reflect.Value, error) {
+		switch typ.Kind() {
+		case reflect.Int:
+			n, err := strconv.Atoi(rest)
+			if err != nil {
+				return reflect.ValueOf(nil), fmt.Errorf("argument to %q must be a number", cfgname)
+			}
+			return reflect.ValueOf(&n), nil
+		case reflect.Bool:
+			v := rest == "true"
+			return reflect.ValueOf(&v), nil
+		default:
+			return reflect.ValueOf(nil), fmt.Errorf("unsupported type for configuration key %q", cfgname)
+		}
+	}
+
+	if field.Kind() == reflect.Ptr {
+		val, err := simpleArg(field.Type().Elem())
+		if err != nil {
+			return err
+		}
+		field.Set(val)
+	} else {
+		val, err := simpleArg(field.Type())
+		if err != nil {
+			return err
+		}
+		field.Set(val.Elem())
+	}
+	return nil
+}
+
+func configureSetSubstitutePath(t *Term, rest string) error {
+	argv := config.SplitQuotedFields(rest, '"')
+	switch len(argv) {
+	case 1: // delete substitute-path rule
+		for i := range t.conf.SubstitutePath {
+			if t.conf.SubstitutePath[i].From == argv[0] {
+				copy(t.conf.SubstitutePath[i:], t.conf.SubstitutePath[i+1:])
+				t.conf.SubstitutePath = t.conf.SubstitutePath[:len(t.conf.SubstitutePath)-1]
+				return nil
+			}
+		}
+		return fmt.Errorf("could not find rule for %q", argv[0])
+	case 2: // add substitute-path rule
+		for i := range t.conf.SubstitutePath {
+			if t.conf.SubstitutePath[i].From == argv[0] {
+				t.conf.SubstitutePath[i].To = argv[1]
+				return nil
+			}
+		}
+		t.conf.SubstitutePath = append(t.conf.SubstitutePath, config.SubstitutePathRule{argv[0], argv[1]})
+	default:
+		return fmt.Errorf("too many arguments to \"config substitute-path\"")
+	}
+	return nil
+}
+
+func configureSetAlias(t *Term, rest string) error {
+	argv := config.SplitQuotedFields(rest, '"')
+	switch len(argv) {
+	case 1: // delete alias rule
+		for k := range t.conf.Aliases {
+			v := t.conf.Aliases[k]
+			for i := range v {
+				if v[i] == argv[0] {
+					copy(v[i:], v[i+1:])
+					t.conf.Aliases[k] = v[:len(v)-1]
+				}
+			}
+		}
+	case 2: // add alias rule
+		alias, cmd := argv[1], argv[0]
+		if t.conf.Aliases == nil {
+			t.conf.Aliases = make(map[string][]string)
+		}
+		t.conf.Aliases[cmd] = append(t.conf.Aliases[cmd], alias)
+	}
+	t.cmds.Merge(t.conf.Aliases)
+	return nil
+}

vendor/github.com/derekparker/delve/pkg/terminal/disasmprint.go

@@ -3,17 +3,18 @@ package terminal
 import (
 	"bufio"
 	"fmt"
-	"github.com/derekparker/delve/service/api"
 	"io"
 	"path/filepath"
 	"text/tabwriter"
+
+	"github.com/derekparker/delve/service/api"
 )
 
 func DisasmPrint(dv api.AsmInstructions, out io.Writer) {
 	bw := bufio.NewWriter(out)
 	defer bw.Flush()
 	if len(dv) > 0 && dv[0].Loc.Function != nil {
-		fmt.Fprintf(bw, "TEXT %s(SB) %s\n", dv[0].Loc.Function.Name, dv[0].Loc.File)
+		fmt.Fprintf(bw, "TEXT %s(SB) %s\n", dv[0].Loc.Function.Name(), dv[0].Loc.File)
 	}
 	tw := tabwriter.NewWriter(bw, 1, 8, 1, '\t', 0)
 	defer tw.Flush()

vendor/github.com/derekparker/delve/pkg/terminal/docgen.go

@@ -27,10 +27,10 @@ func replaceDocPath(s string) string {
 }
 
 func (commands *Commands) WriteMarkdown(w io.Writer) {
-	fmt.Fprintf(w, "# Commands\n\n")
+	fmt.Fprint(w, "# Commands\n\n")
 
-	fmt.Fprintf(w, "Command | Description\n")
+	fmt.Fprint(w, "Command | Description\n")
-	fmt.Fprintf(w, "--------|------------\n")
+	fmt.Fprint(w, "--------|------------\n")
 	for _, cmd := range commands.cmds {
 		h := cmd.helpMsg
 		if idx := strings.Index(h, "\n"); idx >= 0 {
@@ -38,17 +38,17 @@ func (commands *Commands) WriteMarkdown(w io.Writer) {
 		}
 		fmt.Fprintf(w, "[%s](#%s) | %s\n", cmd.aliases[0], cmd.aliases[0], h)
 	}
-	fmt.Fprintf(w, "\n")
+	fmt.Fprint(w, "\n")
 
 	for _, cmd := range commands.cmds {
 		fmt.Fprintf(w, "## %s\n%s\n\n", cmd.aliases[0], replaceDocPath(cmd.helpMsg))
 		if len(cmd.aliases) > 1 {
-			fmt.Fprintf(w, "Aliases:")
+			fmt.Fprint(w, "Aliases:")
 			for _, alias := range cmd.aliases[1:] {
 				fmt.Fprintf(w, " %s", alias)
 			}
-			fmt.Fprintf(w, "\n")
+			fmt.Fprint(w, "\n")
 		}
-		fmt.Fprintf(w, "\n")
+		fmt.Fprint(w, "\n")
 	}
 }

vendor/github.com/derekparker/delve/pkg/terminal/terminal.go

@@ -7,19 +7,40 @@ import (
 	"os/signal"
 	"runtime"
 	"strings"
+	"sync"
 
 	"syscall"
 
 	"github.com/peterh/liner"
 
-	"github.com/derekparker/delve/config"
+	"github.com/derekparker/delve/pkg/config"
 	"github.com/derekparker/delve/service"
+	"github.com/derekparker/delve/service/api"
 )
 
 const (
-	historyFile             string = ".dbg_history"
+	historyFile                 string = ".dbg_history"
-	terminalBlueEscapeCode  string = "\033[34m"
+	terminalHighlightEscapeCode string = "\033[%2dm"
-	terminalResetEscapeCode string = "\033[0m"
+	terminalResetEscapeCode     string = "\033[0m"
+)
+
+const (
+	ansiBlack     = 30
+	ansiRed       = 31
+	ansiGreen     = 32
+	ansiYellow    = 33
+	ansiBlue      = 34
+	ansiMagenta   = 35
+	ansiCyan      = 36
+	ansiWhite     = 37
+	ansiBrBlack   = 90
+	ansiBrRed     = 91
+	ansiBrGreen   = 92
+	ansiBrYellow  = 93
+	ansiBrBlue    = 94
+	ansiBrMagenta = 95
+	ansiBrCyan    = 96
+	ansiBrWhite   = 97
 )
 
 // Term represents the terminal running dlv.
@@ -32,15 +53,40 @@ type Term struct {
 	dumb     bool
 	stdout   io.Writer
 	InitFile string
+
+	// quitContinue is set to true by exitCommand to signal that the process
+	// should be resumed before quitting.
+	quitContinue bool
+
+	quittingMutex sync.Mutex
+	quitting      bool
 }
 
 // New returns a new Term.
 func New(client service.Client, conf *config.Config) *Term {
+	if client != nil && client.IsMulticlient() {
+		state, _ := client.GetStateNonBlocking()
+		// The error return of GetState will usually be the ErrProcessExited,
+		// which we don't care about. If there are other errors they will show up
+		// later, here we are only concerned about stopping a running target so
+		// that we can initialize our connection.
+		if state != nil && state.Running {
+			_, err := client.Halt()
+			if err != nil {
+				fmt.Fprintf(os.Stderr, "could not halt: %v", err)
+				return nil
+			}
+		}
+	}
 	cmds := DebugCommands(client)
 	if conf != nil && conf.Aliases != nil {
 		cmds.Merge(conf.Aliases)
 	}
 
+	if conf == nil {
+		conf = &config.Config{}
+	}
+
 	var w io.Writer
 
 	dumb := strings.ToLower(os.Getenv("TERM")) == "dumb"
@@ -50,6 +96,17 @@ func New(client service.Client, conf *config.Config) *Term {
 		w = getColorableWriter()
 	}
 
+	if client != nil {
+		client.SetReturnValuesLoadConfig(&LongLoadConfig)
+	}
+
+	if (conf.SourceListLineColor > ansiWhite &&
+		conf.SourceListLineColor < ansiBrBlack) ||
+		conf.SourceListLineColor < ansiBlack ||
+		conf.SourceListLineColor > ansiBrWhite {
+		conf.SourceListLineColor = ansiBlue
+	}
+
 	return &Term{
 		client: client,
 		conf:   conf,
@@ -66,22 +123,55 @@ func (t *Term) Close() {
 	t.line.Close()
 }
 
-// Run begins running dlv in the terminal.
+func (t *Term) sigintGuard(ch <-chan os.Signal, multiClient bool) {
-func (t *Term) Run() (int, error) {
+	for range ch {
-	defer t.Close()
+		if multiClient {
+			answer, err := t.line.Prompt("Would you like to [s]top the target or [q]uit this client, leaving the target running [s/q]? ")
+			if err != nil {
+				fmt.Fprintf(os.Stderr, "%v", err)
+				continue
+			}
+			answer = strings.TrimSpace(answer)
+			switch answer {
+			case "s":
+				_, err := t.client.Halt()
+				if err != nil {
+					fmt.Fprintf(os.Stderr, "%v", err)
+				}
+			case "q":
+				t.quittingMutex.Lock()
+				t.quitting = true
+				t.quittingMutex.Unlock()
+				err := t.client.Disconnect(false)
+				if err != nil {
+					fmt.Fprintf(os.Stderr, "%v", err)
+				} else {
+					t.Close()
+				}
+			default:
+				fmt.Println("only s or q allowed")
+			}
 
-	// Send the debugger a halt command on SIGINT
+		} else {
-	ch := make(chan os.Signal)
+			fmt.Printf("received SIGINT, stopping process (will not forward signal)\n")
-	signal.Notify(ch, syscall.SIGINT)
-	go func() {
-		for range ch {
-			fmt.Printf("received SIGINT, stopping process (will not forward signal)")
 			_, err := t.client.Halt()
 			if err != nil {
 				fmt.Fprintf(os.Stderr, "%v", err)
 			}
 		}
-	}()
+	}
+}
+
+// Run begins running dlv in the terminal.
+func (t *Term) Run() (int, error) {
+	defer t.Close()
+
+	multiClient := t.client.IsMulticlient()
+
+	// Send the debugger a halt command on SIGINT
+	ch := make(chan os.Signal)
+	signal.Notify(ch, syscall.SIGINT)
+	go t.sigintGuard(ch, multiClient)
 
 	t.line.SetCompleter(func(line string) (c []string) {
 		for _, cmd := range t.cmds.cmds {
@@ -128,8 +218,7 @@ func (t *Term) Run() (int, error) {
 			return 1, fmt.Errorf("Prompt for input failed.\n")
 		}
 
-		cmdstr, args := parseCommand(cmdstr)
+		if err := t.cmds.Call(cmdstr, t); err != nil {
-		if err := t.cmds.Call(cmdstr, args, t); err != nil {
 			if _, ok := err.(ExitRequestError); ok {
 				return t.handleExit()
 			}
@@ -139,6 +228,12 @@ func (t *Term) Run() (int, error) {
 			if strings.Contains(err.Error(), "exited") {
 				fmt.Fprintln(os.Stderr, err.Error())
 			} else {
+				t.quittingMutex.Lock()
+				quitting := t.quitting
+				t.quittingMutex.Unlock()
+				if quitting {
+					return t.handleExit()
+				}
 				fmt.Fprintf(os.Stderr, "Command failed: %s\n", err)
 			}
 		}
@@ -148,14 +243,15 @@ func (t *Term) Run() (int, error) {
 // Println prints a line to the terminal.
 func (t *Term) Println(prefix, str string) {
 	if !t.dumb {
-		prefix = fmt.Sprintf("%s%s%s", terminalBlueEscapeCode, prefix, terminalResetEscapeCode)
+		terminalColorEscapeCode := fmt.Sprintf(terminalHighlightEscapeCode, t.conf.SourceListLineColor)
+		prefix = fmt.Sprintf("%s%s%s", terminalColorEscapeCode, prefix, terminalResetEscapeCode)
 	}
 	fmt.Fprintf(t.stdout, "%s%s\n", prefix, str)
 }
 
-// Substitues directory to source file.
+// Substitutes directory to source file.
 //
-// Ensures that only directory is substitued, for example:
+// Ensures that only directory is substituted, for example:
 // substitute from `/dir/subdir`, substitute to `/new`
 // for file path `/dir/subdir/file` will return file path `/new/file`.
 // for file path `/dir/subdir-2/file` substitution will not be applied.
@@ -187,7 +283,7 @@ func (t *Term) substitutePath(path string) string {
 }
 
 func crossPlatformPath(path string) string {
-	if runtime.GOOS == "darwin" || runtime.GOOS == "windows" {
+	if runtime.GOOS == "windows" {
 		return strings.ToLower(path)
 	}
 	return path
@@ -207,6 +303,22 @@ func (t *Term) promptForInput() (string, error) {
 	return l, nil
 }
 
+func yesno(line *liner.State, question string) (bool, error) {
+	for {
+		answer, err := line.Prompt(question)
+		if err != nil {
+			return false, err
+		}
+		answer = strings.ToLower(strings.TrimSpace(answer))
+		switch answer {
+		case "n", "no":
+			return false, nil
+		case "y", "yes":
+			return true, nil
+		}
+	}
+}
+
 func (t *Term) handleExit() (int, error) {
 	fullHistoryFile, err := config.GetConfigFilePath(historyFile)
 	if err != nil {
@@ -221,31 +333,63 @@ func (t *Term) handleExit() (int, error) {
 		}
 	}
 
+	t.quittingMutex.Lock()
+	quitting := t.quitting
+	t.quittingMutex.Unlock()
+	if quitting {
+		return 0, nil
+	}
+
 	s, err := t.client.GetState()
 	if err != nil {
 		return 1, err
 	}
 	if !s.Exited {
-		kill := true
+		if t.quitContinue {
-		if t.client.AttachedToExistingProcess() {
+			err := t.client.Disconnect(true)
-			answer, err := t.line.Prompt("Would you like to kill the process? [Y/n] ")
+			if err != nil {
+				return 2, err
+			}
+			return 0, nil
+		}
+
+		doDetach := true
+		if t.client.IsMulticlient() {
+			answer, err := yesno(t.line, "Would you like to kill the headless instance? [Y/n] ")
 			if err != nil {
 				return 2, io.EOF
 			}
-			answer = strings.ToLower(strings.TrimSpace(answer))
+			doDetach = answer
-			kill = (answer != "n" && answer != "no")
 		}
-		if err := t.client.Detach(kill); err != nil {
+
-			return 1, err
+		if doDetach {
+			kill := true
+			if t.client.AttachedToExistingProcess() {
+				answer, err := yesno(t.line, "Would you like to kill the process? [Y/n] ")
+				if err != nil {
+					return 2, io.EOF
+				}
+				kill = answer
+			}
+			if err := t.client.Detach(kill); err != nil {
+				return 1, err
+			}
 		}
 	}
 	return 0, nil
 }
 
-func parseCommand(cmdstr string) (string, string) {
+// loadConfig returns an api.LoadConfig with the parameterss specified in
-	vals := strings.SplitN(cmdstr, " ", 2)
+// the configuration file.
-	if len(vals) == 1 {
+func (t *Term) loadConfig() api.LoadConfig {
-		return vals[0], ""
+	r := api.LoadConfig{true, 1, 64, 64, -1}
+
+	if t.conf != nil && t.conf.MaxStringLen != nil {
+		r.MaxStringLen = *t.conf.MaxStringLen
 	}
-	return vals[0], strings.TrimSpace(vals[1])
+	if t.conf != nil && t.conf.MaxArrayValues != nil {
+		r.MaxArrayValues = *t.conf.MaxArrayValues
+	}
+
+	return r
 }

vendor/github.com/derekparker/delve/pkg/version/version.go

@@ -13,7 +13,10 @@ type Version struct {
 
 var (
 	// DelveVersion is the current version of Delve.
-	DelveVersion = Version{Major: "0", Minor: "12", Patch: "1", Metadata: ""}
+	DelveVersion = Version{
+		Major: "1", Minor: "1", Patch: "0", Metadata: "",
+		Build: "$Id: 1990ba12450cab9425a2ae62e6ab988725023d5c $",
+	}
 )
 
 func (v Version) String() string {

vendor/github.com/derekparker/delve/proc/arch.go

@@ -1,79 +0,0 @@
-package proc
-
-import "runtime"
-
-// Arch defines an interface for representing a
-// CPU architecture.
-type Arch interface {
-	SetGStructOffset(ver GoVersion, iscgo bool)
-	PtrSize() int
-	BreakpointInstruction() []byte
-	BreakpointSize() int
-	GStructOffset() uint64
-}
-
-// AMD64 represents the AMD64 CPU architecture.
-type AMD64 struct {
-	ptrSize                 int
-	breakInstruction        []byte
-	breakInstructionLen     int
-	gStructOffset           uint64
-	hardwareBreakpointUsage []bool
-}
-
-// AMD64Arch returns an initialized AMD64
-// struct.
-func AMD64Arch() *AMD64 {
-	var breakInstr = []byte{0xCC}
-
-	return &AMD64{
-		ptrSize:                 8,
-		breakInstruction:        breakInstr,
-		breakInstructionLen:     len(breakInstr),
-		hardwareBreakpointUsage: make([]bool, 4),
-	}
-}
-
-// SetGStructOffset sets the offset of the G struct on the AMD64
-// arch struct. The offset is dependent on the Go compiler Version
-// and whether or not the target program was externally linked.
-func (a *AMD64) SetGStructOffset(ver GoVersion, isextld bool) {
-	switch runtime.GOOS {
-	case "darwin":
-		a.gStructOffset = 0x8a0
-	case "linux":
-		a.gStructOffset = 0xfffffffffffffff0
-		if isextld || ver.AfterOrEqual(GoVersion{1, 5, -1, 2, 0}) || ver.IsDevel() {
-			a.gStructOffset += 8
-		}
-	case "windows":
-		// Use ArbitraryUserPointer (0x28) as pointer to pointer
-		// to G struct per:
-		// https://golang.org/src/runtime/cgo/gcc_windows_amd64.c
-		a.gStructOffset = 0x28
-	}
-}
-
-// PtrSize returns the size of a pointer
-// on this architecture.
-func (a *AMD64) PtrSize() int {
-	return a.ptrSize
-}
-
-// BreakpointInstruction returns the Breakpoint
-// instruction for this architecture.
-func (a *AMD64) BreakpointInstruction() []byte {
-	return a.breakInstruction
-}
-
-// BreakpointSize returns the size of the
-// breakpoint instruction on this architecture.
-func (a *AMD64) BreakpointSize() int {
-	return a.breakInstructionLen
-}
-
-// GStructOffset returns the offset of the G
-// struct in thread local storage.
-func (a *AMD64) GStructOffset() uint64 {
-	return a.gStructOffset
-}

vendor/github.com/derekparker/delve/proc/breakpoints.go

@@ -1,163 +0,0 @@
-package proc
-
-import (
-	"errors"
-	"fmt"
-	"go/ast"
-	"go/constant"
-	"reflect"
-)
-
-// Breakpoint represents a breakpoint. Stores information on the break
-// point including the byte of data that originally was stored at that
-// address.
-type Breakpoint struct {
-	// File & line information for printing.
-	FunctionName string
-	File         string
-	Line         int
-
-	Addr         uint64         // Address breakpoint is set for.
-	OriginalData []byte         // If software breakpoint, the data we replace with breakpoint instruction.
-	Name         string         // User defined name of the breakpoint
-	ID           int            // Monotonically increasing ID.
-	Kind         BreakpointKind // Whether this is an internal breakpoint (for next'ing or stepping).
-
-	// Breakpoint information
-	Tracepoint    bool     // Tracepoint flag
-	Goroutine     bool     // Retrieve goroutine information
-	Stacktrace    int      // Number of stack frames to retrieve
-	Variables     []string // Variables to evaluate
-	LoadArgs      *LoadConfig
-	LoadLocals    *LoadConfig
-	HitCount      map[int]uint64 // Number of times a breakpoint has been reached in a certain goroutine
-	TotalHitCount uint64         // Number of times a breakpoint has been reached
-
-	// DeferReturns: when kind == NextDeferBreakpoint this breakpoint
-	// will also check if the caller is runtime.gopanic or if the return
-	// address is in the DeferReturns array.
-	// Next uses NextDeferBreakpoints for the breakpoint it sets on the
-	// deferred function, DeferReturns is populated with the
-	// addresses of calls to runtime.deferreturn in the current
-	// function. This insures that the breakpoint on the deferred
-	// function only triggers on panic or on the defer call to
-	// the function, not when the function is called directly
-	DeferReturns []uint64
-	// Cond: if not nil the breakpoint will be triggered only if evaluating Cond returns true
-	Cond ast.Expr
-}
-
-// Breakpoint Kind determines the behavior of delve when the
-// breakpoint is reached.
-type BreakpointKind int
-
-const (
-	// UserBreakpoint is a user set breakpoint
-	UserBreakpoint BreakpointKind = iota
-	// NextBreakpoint is a breakpoint set by Next, Continue
-	// will stop on it and delete it
-	NextBreakpoint
-	// NextDeferBreakpoint is a breakpoint set by Next on the
-	// first deferred function. In addition to checking their condition
-	// breakpoints of this kind will also check that the function has been
-	// called by runtime.gopanic or through runtime.deferreturn.
-	NextDeferBreakpoint
-	// StepBreakpoint is a breakpoint set by Step on a CALL instruction,
-	// Continue will set a new breakpoint (of NextBreakpoint kind) on the
-	// destination of CALL, delete this breakpoint and then continue again
-	StepBreakpoint
-)
-
-func (bp *Breakpoint) String() string {
-	return fmt.Sprintf("Breakpoint %d at %#v %s:%d (%d)", bp.ID, bp.Addr, bp.File, bp.Line, bp.TotalHitCount)
-}
-
-// Clear this breakpoint appropriately depending on whether it is a
-// hardware or software breakpoint.
-func (bp *Breakpoint) Clear(thread *Thread) (*Breakpoint, error) {
-	if _, err := thread.writeMemory(uintptr(bp.Addr), bp.OriginalData); err != nil {
-		return nil, fmt.Errorf("could not clear breakpoint %s", err)
-	}
-	return bp, nil
-}
-
-// BreakpointExistsError is returned when trying to set a breakpoint at
-// an address that already has a breakpoint set for it.
-type BreakpointExistsError struct {
-	file string
-	line int
-	addr uint64
-}
-
-func (bpe BreakpointExistsError) Error() string {
-	return fmt.Sprintf("Breakpoint exists at %s:%d at %x", bpe.file, bpe.line, bpe.addr)
-}
-
-// InvalidAddressError represents the result of
-// attempting to set a breakpoint at an invalid address.
-type InvalidAddressError struct {
-	address uint64
-}
-
-func (iae InvalidAddressError) Error() string {
-	return fmt.Sprintf("Invalid address %#v\n", iae.address)
-}
-
-func (dbp *Process) writeSoftwareBreakpoint(thread *Thread, addr uint64) error {
-	_, err := thread.writeMemory(uintptr(addr), dbp.arch.BreakpointInstruction())
-	return err
-}
-
-func (bp *Breakpoint) checkCondition(thread *Thread) (bool, error) {
-	if bp.Cond == nil {
-		return true, nil
-	}
-	if bp.Kind == NextDeferBreakpoint {
-		frames, err := thread.Stacktrace(2)
-		if err == nil {
-			ispanic := len(frames) >= 3 && frames[2].Current.Fn != nil && frames[2].Current.Fn.Name == "runtime.gopanic"
-			isdeferreturn := false
-			if len(frames) >= 1 {
-				for _, pc := range bp.DeferReturns {
-					if frames[0].Ret == pc {
-						isdeferreturn = true
-						break
-					}
-				}
-			}
-			if !ispanic && !isdeferreturn {
-				return false, nil
-			}
-		}
-	}
-	scope, err := thread.Scope()
-	if err != nil {
-		return true, err
-	}
-	v, err := scope.evalAST(bp.Cond)
-	if err != nil {
-		return true, fmt.Errorf("error evaluating expression: %v", err)
-	}
-	if v.Unreadable != nil {
-		return true, fmt.Errorf("condition expression unreadable: %v", v.Unreadable)
-	}
-	if v.Kind != reflect.Bool {
-		return true, errors.New("condition expression not boolean")
-	}
-	return constant.BoolVal(v.Value), nil
-}
-
-// Internal returns true for breakpoints not set directly by the user.
-func (bp *Breakpoint) Internal() bool {
-	return bp.Kind != UserBreakpoint
-}
-
-// NoBreakpointError is returned when trying to
-// clear a breakpoint that does not exist.
-type NoBreakpointError struct {
-	addr uint64
-}
-
-func (nbp NoBreakpointError) Error() string {
-	return fmt.Sprintf("no breakpoint at %#v", nbp.addr)
-}

vendor/github.com/derekparker/delve/proc/disasm.go

@@ -1,67 +0,0 @@
-package proc
-
-type AsmInstruction struct {
-	Loc        Location
-	DestLoc    *Location
-	Bytes      []byte
-	Breakpoint bool
-	AtPC       bool
-	Inst       *ArchInst
-}
-
-type AssemblyFlavour int
-
-const (
-	GNUFlavour = AssemblyFlavour(iota)
-	IntelFlavour
-)
-
-// Disassemble disassembles target memory between startPC and endPC
-// If currentGoroutine is set and thread is stopped at a CALL instruction Disassemble will evaluate the argument of the CALL instruction using the thread's registers
-// Be aware that the Bytes field of each returned instruction is a slice of a larger array of size endPC - startPC
-func (thread *Thread) Disassemble(startPC, endPC uint64, currentGoroutine bool) ([]AsmInstruction, error) {
-	if thread.dbp.exited {
-		return nil, &ProcessExitedError{}
-	}
-	mem, err := thread.readMemory(uintptr(startPC), int(endPC-startPC))
-	if err != nil {
-		return nil, err
-	}
-
-	r := make([]AsmInstruction, 0, len(mem)/15)
-	pc := startPC
-
-	var curpc uint64
-	var regs Registers
-	if currentGoroutine {
-		regs, _ = thread.Registers(false)
-		if regs != nil {
-			curpc = regs.PC()
-		}
-	}
-
-	for len(mem) > 0 {
-		bp, atbp := thread.dbp.Breakpoints[pc]
-		if atbp {
-			for i := range bp.OriginalData {
-				mem[i] = bp.OriginalData[i]
-			}
-		}
-		file, line, fn := thread.dbp.PCToLine(pc)
-		loc := Location{PC: pc, File: file, Line: line, Fn: fn}
-		inst, err := asmDecode(mem, pc)
-		if err == nil {
-			atpc := currentGoroutine && (curpc == pc)
-			destloc := thread.resolveCallArg(inst, atpc, regs)
-			r = append(r, AsmInstruction{Loc: loc, DestLoc: destloc, Bytes: mem[:inst.Len], Breakpoint: atbp, AtPC: atpc, Inst: inst})
-
-			pc += uint64(inst.Size())
-			mem = mem[inst.Size():]
-		} else {
-			r = append(r, AsmInstruction{Loc: loc, Bytes: mem[:1], Breakpoint: atbp, Inst: nil})
-			pc++
-			mem = mem[1:]
-		}
-	}
-	return r, nil
-}

vendor/github.com/derekparker/delve/proc/go_version.go

@@ -1,113 +0,0 @@
-package proc
-
-import (
-	"strconv"
-	"strings"
-)
-
-// GoVersion represents the Go version of
-// the Go compiler version used to compile
-// the target binary.
-type GoVersion struct {
-	Major int
-	Minor int
-	Rev   int
-	Beta  int
-	RC    int
-}
-
-func ParseVersionString(ver string) (GoVersion, bool) {
-	var r GoVersion
-	var err1, err2, err3 error
-
-	if strings.HasPrefix(ver, "devel") {
-		return GoVersion{-1, 0, 0, 0, 0}, true
-	}
-
-	if strings.HasPrefix(ver, "go") {
-		ver := strings.Split(ver, " ")[0]
-		v := strings.SplitN(ver[2:], ".", 3)
-		switch len(v) {
-		case 2:
-			r.Major, err1 = strconv.Atoi(v[0])
-			vr := strings.SplitN(v[1], "beta", 2)
-			if len(vr) == 2 {
-				r.Beta, err3 = strconv.Atoi(vr[1])
-			} else {
-				vr = strings.SplitN(v[1], "rc", 2)
-				if len(vr) == 2 {
-					r.RC, err3 = strconv.Atoi(vr[1])
-				} else {
-					r.Minor, err2 = strconv.Atoi(v[1])
-					if err2 != nil {
-						return GoVersion{}, false
-					}
-					return r, true
-				}
-			}
-
-			r.Minor, err2 = strconv.Atoi(vr[0])
-			r.Rev = -1
-
-			if err1 != nil || err2 != nil || err3 != nil {
-				return GoVersion{}, false
-			}
-
-			return r, true
-
-		case 3:
-
-			r.Major, err1 = strconv.Atoi(v[0])
-			r.Minor, err2 = strconv.Atoi(v[1])
-			r.Rev, err3 = strconv.Atoi(v[2])
-			if err1 != nil || err2 != nil || err3 != nil {
-				return GoVersion{}, false
-			}
-
-			return r, true
-
-		default:
-			return GoVersion{}, false
-		}
-	}
-
-	return GoVersion{}, false
-}
-
-// AfterOrEqual returns whether one GoVersion is after or
-// equal to the other.
-func (v *GoVersion) AfterOrEqual(b GoVersion) bool {
-	if v.Major < b.Major {
-		return false
-	} else if v.Major > b.Major {
-		return true
-	}
-
-	if v.Minor < b.Minor {
-		return false
-	} else if v.Minor > b.Minor {
-		return true
-	}
-
-	if v.Rev < b.Rev {
-		return false
-	} else if v.Rev > b.Rev {
-		return true
-	}
-
-	if v.Beta < b.Beta {
-		return false
-	}
-
-	if v.RC < b.RC {
-		return false
-	}
-
-	return true
-}
-
-// IsDevel returns whether the GoVersion
-// is a development version.
-func (v *GoVersion) IsDevel() bool {
-	return v.Major < 0
-}

vendor/github.com/derekparker/delve/proc/mem.go

@@ -1,57 +0,0 @@
-package proc
-
-const cacheEnabled = true
-
-type memoryReadWriter interface {
-	readMemory(addr uintptr, size int) (data []byte, err error)
-	writeMemory(addr uintptr, data []byte) (written int, err error)
-}
-
-type memCache struct {
-	cacheAddr uintptr
-	cache     []byte
-	mem       memoryReadWriter
-}
-
-func (m *memCache) contains(addr uintptr, size int) bool {
-	return addr >= m.cacheAddr && addr <= (m.cacheAddr+uintptr(len(m.cache)-size))
-}
-
-func (m *memCache) readMemory(addr uintptr, size int) (data []byte, err error) {
-	if m.contains(addr, size) {
-		d := make([]byte, size)
-		copy(d, m.cache[addr-m.cacheAddr:])
-		return d, nil
-	}
-
-	return m.mem.readMemory(addr, size)
-}
-
-func (m *memCache) writeMemory(addr uintptr, data []byte) (written int, err error) {
-	return m.mem.writeMemory(addr, data)
-}
-
-func cacheMemory(mem memoryReadWriter, addr uintptr, size int) memoryReadWriter {
-	if !cacheEnabled {
-		return mem
-	}
-	if size <= 0 {
-		return mem
-	}
-	if cacheMem, isCache := mem.(*memCache); isCache {
-		if cacheMem.contains(addr, size) {
-			return mem
-		} else {
-			cache, err := cacheMem.mem.readMemory(addr, size)
-			if err != nil {
-				return mem
-			}
-			return &memCache{addr, cache, mem}
-		}
-	}
-	cache, err := mem.readMemory(addr, size)
-	if err != nil {
-		return mem
-	}
-	return &memCache{addr, cache, mem}
-}

vendor/github.com/derekparker/delve/proc/proc.go

@@ -1,942 +0,0 @@
-package proc
-
-import (
-	"debug/gosym"
-	"encoding/binary"
-	"errors"
-	"fmt"
-	"go/ast"
-	"go/constant"
-	"go/token"
-	"os"
-	"path/filepath"
-	"runtime"
-	"strconv"
-	"strings"
-	"sync"
-	"time"
-
-	"github.com/derekparker/delve/dwarf/frame"
-	"github.com/derekparker/delve/dwarf/line"
-	"github.com/derekparker/delve/dwarf/reader"
-	"golang.org/x/debug/dwarf"
-)
-
-// Process represents all of the information the debugger
-// is holding onto regarding the process we are debugging.
-type Process struct {
-	Pid          int         // Process Pid
-	Process      *os.Process // Pointer to process struct for the actual process we are debugging
-	LastModified time.Time   // Time the executable of this process was last modified
-
-	// Breakpoint table, holds information on breakpoints.
-	// Maps instruction address to Breakpoint struct.
-	Breakpoints map[uint64]*Breakpoint
-
-	// List of threads mapped as such: pid -> *Thread
-	Threads map[int]*Thread
-
-	// Active thread
-	CurrentThread *Thread
-
-	// Goroutine that will be used by default to set breakpoint, eval variables, etc...
-	// Normally SelectedGoroutine is CurrentThread.GetG, it will not be only if SwitchGoroutine is called with a goroutine that isn't attached to a thread
-	SelectedGoroutine *G
-
-	// Maps package names to package paths, needed to lookup types inside DWARF info
-	packageMap map[string]string
-
-	allGCache                   []*G
-	dwarf                       *dwarf.Data
-	goSymTable                  *gosym.Table
-	frameEntries                frame.FrameDescriptionEntries
-	lineInfo                    line.DebugLines
-	os                          *OSProcessDetails
-	arch                        Arch
-	breakpointIDCounter         int
-	internalBreakpointIDCounter int
-	firstStart                  bool
-	halt                        bool
-	exited                      bool
-	ptraceChan                  chan func()
-	ptraceDoneChan              chan interface{}
-	types                       map[string]dwarf.Offset
-
-	loadModuleDataOnce sync.Once
-	moduleData         []moduleData
-	nameOfRuntimeType  map[uintptr]nameOfRuntimeTypeEntry
-}
-
-var NotExecutableErr = errors.New("not an executable file")
-
-// New returns an initialized Process struct. Before returning,
-// it will also launch a goroutine in order to handle ptrace(2)
-// functions. For more information, see the documentation on
-// `handlePtraceFuncs`.
-func New(pid int) *Process {
-	dbp := &Process{
-		Pid:               pid,
-		Threads:           make(map[int]*Thread),
-		Breakpoints:       make(map[uint64]*Breakpoint),
-		firstStart:        true,
-		os:                new(OSProcessDetails),
-		ptraceChan:        make(chan func()),
-		ptraceDoneChan:    make(chan interface{}),
-		nameOfRuntimeType: make(map[uintptr]nameOfRuntimeTypeEntry),
-	}
-	// TODO: find better way to determine proc arch (perhaps use executable file info)
-	switch runtime.GOARCH {
-	case "amd64":
-		dbp.arch = AMD64Arch()
-	}
-	go dbp.handlePtraceFuncs()
-	return dbp
-}
-
-// ProcessExitedError indicates that the process has exited and contains both
-// process id and exit status.
-type ProcessExitedError struct {
-	Pid    int
-	Status int
-}
-
-func (pe ProcessExitedError) Error() string {
-	return fmt.Sprintf("Process %d has exited with status %d", pe.Pid, pe.Status)
-}
-
-// Detach from the process being debugged, optionally killing it.
-func (dbp *Process) Detach(kill bool) (err error) {
-	if dbp.Running() {
-		if err = dbp.Halt(); err != nil {
-			return
-		}
-	}
-	if !kill {
-		// Clean up any breakpoints we've set.
-		for _, bp := range dbp.Breakpoints {
-			if bp != nil {
-				_, err := dbp.ClearBreakpoint(bp.Addr)
-				if err != nil {
-					return err
-				}
-			}
-		}
-	}
-	dbp.execPtraceFunc(func() {
-		err = PtraceDetach(dbp.Pid, 0)
-		if err != nil {
-			return
-		}
-		if kill {
-			err = killProcess(dbp.Pid)
-		}
-	})
-	return
-}
-
-// Exited returns whether the debugged
-// process has exited.
-func (dbp *Process) Exited() bool {
-	return dbp.exited
-}
-
-// Running returns whether the debugged
-// process is currently executing.
-func (dbp *Process) Running() bool {
-	for _, th := range dbp.Threads {
-		if th.running {
-			return true
-		}
-	}
-	return false
-}
-
-// LoadInformation finds the executable and then uses it
-// to parse the following information:
-// * Dwarf .debug_frame section
-// * Dwarf .debug_line section
-// * Go symbol table.
-func (dbp *Process) LoadInformation(path string) error {
-	var wg sync.WaitGroup
-
-	exe, path, err := dbp.findExecutable(path)
-	if err != nil {
-		return err
-	}
-	fi, err := os.Stat(path)
-	if err == nil {
-		dbp.LastModified = fi.ModTime()
-	}
-
-	wg.Add(5)
-	go dbp.loadProcessInformation(&wg)
-	go dbp.parseDebugFrame(exe, &wg)
-	go dbp.obtainGoSymbols(exe, &wg)
-	go dbp.parseDebugLineInfo(exe, &wg)
-	go dbp.loadTypeMap(&wg)
-	wg.Wait()
-
-	return nil
-}
-
-// FindFileLocation returns the PC for a given file:line.
-// Assumes that `file` is normailzed to lower case and '/' on Windows.
-func (dbp *Process) FindFileLocation(fileName string, lineno int) (uint64, error) {
-	pc, fn, err := dbp.goSymTable.LineToPC(fileName, lineno)
-	if err != nil {
-		return 0, err
-	}
-	if fn.Entry == pc {
-		pc, _ = dbp.FirstPCAfterPrologue(fn, true)
-	}
-	return pc, nil
-}
-
-// FindFunctionLocation finds address of a function's line
-// If firstLine == true is passed FindFunctionLocation will attempt to find the first line of the function
-// If lineOffset is passed FindFunctionLocation will return the address of that line
-// Pass lineOffset == 0 and firstLine == false if you want the address for the function's entry point
-// Note that setting breakpoints at that address will cause surprising behavior:
-// https://github.com/derekparker/delve/issues/170
-func (dbp *Process) FindFunctionLocation(funcName string, firstLine bool, lineOffset int) (uint64, error) {
-	origfn := dbp.goSymTable.LookupFunc(funcName)
-	if origfn == nil {
-		return 0, fmt.Errorf("Could not find function %s\n", funcName)
-	}
-
-	if firstLine {
-		return dbp.FirstPCAfterPrologue(origfn, false)
-	} else if lineOffset > 0 {
-		filename, lineno, _ := dbp.goSymTable.PCToLine(origfn.Entry)
-		breakAddr, _, err := dbp.goSymTable.LineToPC(filename, lineno+lineOffset)
-		return breakAddr, err
-	}
-
-	return origfn.Entry, nil
-}
-
-// CurrentLocation returns the location of the current thread.
-func (dbp *Process) CurrentLocation() (*Location, error) {
-	return dbp.CurrentThread.Location()
-}
-
-// RequestManualStop sets the `halt` flag and
-// sends SIGSTOP to all threads.
-func (dbp *Process) RequestManualStop() error {
-	if dbp.exited {
-		return &ProcessExitedError{}
-	}
-	dbp.halt = true
-	return dbp.requestManualStop()
-}
-
-// SetBreakpoint sets a breakpoint at addr, and stores it in the process wide
-// break point table. Setting a break point must be thread specific due to
-// ptrace actions needing the thread to be in a signal-delivery-stop.
-func (dbp *Process) SetBreakpoint(addr uint64, kind BreakpointKind, cond ast.Expr) (*Breakpoint, error) {
-	tid := dbp.CurrentThread.ID
-
-	if bp, ok := dbp.FindBreakpoint(addr); ok {
-		return nil, BreakpointExistsError{bp.File, bp.Line, bp.Addr}
-	}
-
-	f, l, fn := dbp.goSymTable.PCToLine(uint64(addr))
-	if fn == nil {
-		return nil, InvalidAddressError{address: addr}
-	}
-
-	newBreakpoint := &Breakpoint{
-		FunctionName: fn.Name,
-		File:         f,
-		Line:         l,
-		Addr:         addr,
-		Kind:         kind,
-		Cond:         cond,
-		HitCount:     map[int]uint64{},
-	}
-
-	if kind != UserBreakpoint {
-		dbp.internalBreakpointIDCounter++
-		newBreakpoint.ID = dbp.internalBreakpointIDCounter
-	} else {
-		dbp.breakpointIDCounter++
-		newBreakpoint.ID = dbp.breakpointIDCounter
-	}
-
-	thread := dbp.Threads[tid]
-	originalData, err := thread.readMemory(uintptr(addr), dbp.arch.BreakpointSize())
-	if err != nil {
-		return nil, err
-	}
-	if err := dbp.writeSoftwareBreakpoint(thread, addr); err != nil {
-		return nil, err
-	}
-	newBreakpoint.OriginalData = originalData
-	dbp.Breakpoints[addr] = newBreakpoint
-
-	return newBreakpoint, nil
-}
-
-// ClearBreakpoint clears the breakpoint at addr.
-func (dbp *Process) ClearBreakpoint(addr uint64) (*Breakpoint, error) {
-	if dbp.exited {
-		return nil, &ProcessExitedError{}
-	}
-	bp, ok := dbp.FindBreakpoint(addr)
-	if !ok {
-		return nil, NoBreakpointError{addr: addr}
-	}
-
-	if _, err := bp.Clear(dbp.CurrentThread); err != nil {
-		return nil, err
-	}
-
-	delete(dbp.Breakpoints, addr)
-
-	return bp, nil
-}
-
-// Status returns the status of the current main thread context.
-func (dbp *Process) Status() *WaitStatus {
-	return dbp.CurrentThread.Status
-}
-
-// Next continues execution until the next source line.
-func (dbp *Process) Next() (err error) {
-	if dbp.exited {
-		return &ProcessExitedError{}
-	}
-	for i := range dbp.Breakpoints {
-		if dbp.Breakpoints[i].Internal() {
-			return fmt.Errorf("next while nexting")
-		}
-	}
-
-	if err = dbp.next(false); err != nil {
-		switch err.(type) {
-		case ThreadBlockedError, NoReturnAddr: // Noop
-		default:
-			dbp.ClearInternalBreakpoints()
-			return
-		}
-	}
-
-	return dbp.Continue()
-}
-
-// Continue continues execution of the debugged
-// process. It will continue until it hits a breakpoint
-// or is otherwise stopped.
-func (dbp *Process) Continue() error {
-	if dbp.exited {
-		return &ProcessExitedError{}
-	}
-	for {
-		if err := dbp.resume(); err != nil {
-			return err
-		}
-
-		dbp.allGCache = nil
-		for _, th := range dbp.Threads {
-			th.clearBreakpointState()
-		}
-
-		trapthread, err := dbp.trapWait(-1)
-		if err != nil {
-			return err
-		}
-		if err := dbp.Halt(); err != nil {
-			return dbp.exitGuard(err)
-		}
-		if err := dbp.setCurrentBreakpoints(trapthread); err != nil {
-			return err
-		}
-		if err := dbp.pickCurrentThread(trapthread); err != nil {
-			return err
-		}
-
-		switch {
-		case dbp.CurrentThread.CurrentBreakpoint == nil:
-			// runtime.Breakpoint or manual stop
-			if dbp.CurrentThread.onRuntimeBreakpoint() {
-				for i := 0; i < 2; i++ {
-					if err = dbp.CurrentThread.StepInstruction(); err != nil {
-						return err
-					}
-				}
-			}
-			return dbp.conditionErrors()
-		case dbp.CurrentThread.onTriggeredInternalBreakpoint():
-			if dbp.CurrentThread.CurrentBreakpoint.Kind == StepBreakpoint {
-				// See description of proc.(*Process).next for the meaning of StepBreakpoints
-				if err := dbp.conditionErrors(); err != nil {
-					return err
-				}
-				pc, err := dbp.CurrentThread.PC()
-				if err != nil {
-					return err
-				}
-				text, err := dbp.CurrentThread.Disassemble(pc, pc+maxInstructionLength, true)
-				if err != nil {
-					return err
-				}
-				// here we either set a breakpoint into the destination of the CALL
-				// instruction or we determined that the called function is hidden,
-				// either way we need to resume execution
-				if err = dbp.setStepIntoBreakpoint(text, sameGoroutineCondition(dbp.SelectedGoroutine)); err != nil {
-					return err
-				}
-			} else {
-				if err := dbp.ClearInternalBreakpoints(); err != nil {
-					return err
-				}
-				return dbp.conditionErrors()
-			}
-		case dbp.CurrentThread.onTriggeredBreakpoint():
-			onNextGoroutine, err := dbp.CurrentThread.onNextGoroutine()
-			if err != nil {
-				return err
-			}
-			if onNextGoroutine {
-				err := dbp.ClearInternalBreakpoints()
-				if err != nil {
-					return err
-				}
-			}
-			return dbp.conditionErrors()
-		default:
-			// not a manual stop, not on runtime.Breakpoint, not on a breakpoint, just repeat
-		}
-	}
-}
-
-func (dbp *Process) conditionErrors() error {
-	var condErr error
-	for _, th := range dbp.Threads {
-		if th.CurrentBreakpoint != nil && th.BreakpointConditionError != nil {
-			if condErr == nil {
-				condErr = th.BreakpointConditionError
-			} else {
-				return fmt.Errorf("multiple errors evaluating conditions")
-			}
-		}
-	}
-	return condErr
-}
-
-// pick a new dbp.CurrentThread, with the following priority:
-// 	- a thread with onTriggeredInternalBreakpoint() == true
-// 	- a thread with onTriggeredBreakpoint() == true (prioritizing trapthread)
-// 	- trapthread
-func (dbp *Process) pickCurrentThread(trapthread *Thread) error {
-	for _, th := range dbp.Threads {
-		if th.onTriggeredInternalBreakpoint() {
-			return dbp.SwitchThread(th.ID)
-		}
-	}
-	if trapthread.onTriggeredBreakpoint() {
-		return dbp.SwitchThread(trapthread.ID)
-	}
-	for _, th := range dbp.Threads {
-		if th.onTriggeredBreakpoint() {
-			return dbp.SwitchThread(th.ID)
-		}
-	}
-	return dbp.SwitchThread(trapthread.ID)
-}
-
-// Step will continue until another source line is reached.
-// Will step into functions.
-func (dbp *Process) Step() (err error) {
-	if dbp.exited {
-		return &ProcessExitedError{}
-	}
-	for i := range dbp.Breakpoints {
-		if dbp.Breakpoints[i].Internal() {
-			return fmt.Errorf("next while nexting")
-		}
-	}
-
-	if err = dbp.next(true); err != nil {
-		switch err.(type) {
-		case ThreadBlockedError, NoReturnAddr: // Noop
-		default:
-			dbp.ClearInternalBreakpoints()
-			return
-		}
-	}
-
-	return dbp.Continue()
-}
-
-// Returns an expression that evaluates to true when the current goroutine is g
-func sameGoroutineCondition(g *G) ast.Expr {
-	if g == nil {
-		return nil
-	}
-	return &ast.BinaryExpr{
-		Op: token.EQL,
-		X: &ast.SelectorExpr{
-			X: &ast.SelectorExpr{
-				X:   &ast.Ident{Name: "runtime"},
-				Sel: &ast.Ident{Name: "curg"},
-			},
-			Sel: &ast.Ident{Name: "goid"},
-		},
-		Y: &ast.BasicLit{Kind: token.INT, Value: strconv.Itoa(g.ID)},
-	}
-}
-
-// StepInstruction will continue the current thread for exactly
-// one instruction. This method affects only the thread
-// asssociated with the selected goroutine. All other
-// threads will remain stopped.
-func (dbp *Process) StepInstruction() (err error) {
-	if dbp.SelectedGoroutine == nil {
-		return errors.New("cannot single step: no selected goroutine")
-	}
-	if dbp.SelectedGoroutine.thread == nil {
-		// Step called on parked goroutine
-		if _, err := dbp.SetBreakpoint(dbp.SelectedGoroutine.PC, NextBreakpoint, sameGoroutineCondition(dbp.SelectedGoroutine)); err != nil {
-			return err
-		}
-		return dbp.Continue()
-	}
-	dbp.allGCache = nil
-	if dbp.exited {
-		return &ProcessExitedError{}
-	}
-	dbp.SelectedGoroutine.thread.clearBreakpointState()
-	err = dbp.SelectedGoroutine.thread.StepInstruction()
-	if err != nil {
-		return err
-	}
-	return dbp.SelectedGoroutine.thread.SetCurrentBreakpoint()
-}
-
-// StepOut will continue until the current goroutine exits the
-// function currently being executed or a deferred function is executed
-func (dbp *Process) StepOut() error {
-	cond := sameGoroutineCondition(dbp.SelectedGoroutine)
-
-	topframe, err := topframe(dbp.SelectedGoroutine, dbp.CurrentThread)
-	if err != nil {
-		return err
-	}
-
-	pcs := []uint64{}
-
-	var deferpc uint64 = 0
-	if filepath.Ext(topframe.Current.File) == ".go" {
-		if dbp.SelectedGoroutine != nil && dbp.SelectedGoroutine.DeferPC != 0 {
-			_, _, deferfn := dbp.goSymTable.PCToLine(dbp.SelectedGoroutine.DeferPC)
-			deferpc, err = dbp.FirstPCAfterPrologue(deferfn, false)
-			if err != nil {
-				return err
-			}
-			pcs = append(pcs, deferpc)
-		}
-	}
-
-	if topframe.Ret == 0 && deferpc == 0 {
-		return errors.New("nothing to stepout to")
-	}
-
-	if deferpc != 0 && deferpc != topframe.Current.PC {
-		bp, err := dbp.SetBreakpoint(deferpc, NextDeferBreakpoint, cond)
-		if err != nil {
-			if _, ok := err.(BreakpointExistsError); !ok {
-				dbp.ClearInternalBreakpoints()
-				return err
-			}
-		}
-		if bp != nil {
-			// For StepOut we do not want to step into the deferred function
-			// when it's called by runtime.deferreturn so we do not populate
-			// DeferReturns.
-			bp.DeferReturns = []uint64{}
-		}
-	}
-
-	if topframe.Ret != 0 {
-		if err := dbp.setInternalBreakpoints(topframe.Current.PC, []uint64{topframe.Ret}, NextBreakpoint, cond); err != nil {
-			return err
-		}
-	}
-
-	return dbp.Continue()
-}
-
-// SwitchThread changes from current thread to the thread specified by `tid`.
-func (dbp *Process) SwitchThread(tid int) error {
-	if dbp.exited {
-		return &ProcessExitedError{}
-	}
-	if th, ok := dbp.Threads[tid]; ok {
-		dbp.CurrentThread = th
-		dbp.SelectedGoroutine, _ = dbp.CurrentThread.GetG()
-		return nil
-	}
-	return fmt.Errorf("thread %d does not exist", tid)
-}
-
-// SwitchGoroutine changes from current thread to the thread
-// running the specified goroutine.
-func (dbp *Process) SwitchGoroutine(gid int) error {
-	if dbp.exited {
-		return &ProcessExitedError{}
-	}
-	g, err := dbp.FindGoroutine(gid)
-	if err != nil {
-		return err
-	}
-	if g == nil {
-		// user specified -1 and SelectedGoroutine is nil
-		return nil
-	}
-	if g.thread != nil {
-		return dbp.SwitchThread(g.thread.ID)
-	}
-	dbp.SelectedGoroutine = g
-	return nil
-}
-
-// GoroutinesInfo returns an array of G structures representing the information
-// Delve cares about from the internal runtime G structure.
-func (dbp *Process) GoroutinesInfo() ([]*G, error) {
-	if dbp.exited {
-		return nil, &ProcessExitedError{}
-	}
-	if dbp.allGCache != nil {
-		return dbp.allGCache, nil
-	}
-
-	var (
-		threadg = map[int]*Thread{}
-		allg    []*G
-		rdr     = dbp.DwarfReader()
-	)
-
-	for i := range dbp.Threads {
-		if dbp.Threads[i].blocked() {
-			continue
-		}
-		g, _ := dbp.Threads[i].GetG()
-		if g != nil {
-			threadg[g.ID] = dbp.Threads[i]
-		}
-	}
-
-	addr, err := rdr.AddrFor("runtime.allglen")
-	if err != nil {
-		return nil, err
-	}
-	allglenBytes, err := dbp.CurrentThread.readMemory(uintptr(addr), 8)
-	if err != nil {
-		return nil, err
-	}
-	allglen := binary.LittleEndian.Uint64(allglenBytes)
-
-	rdr.Seek(0)
-	allgentryaddr, err := rdr.AddrFor("runtime.allgs")
-	if err != nil {
-		// try old name (pre Go 1.6)
-		allgentryaddr, err = rdr.AddrFor("runtime.allg")
-		if err != nil {
-			return nil, err
-		}
-	}
-	faddr, err := dbp.CurrentThread.readMemory(uintptr(allgentryaddr), dbp.arch.PtrSize())
-	allgptr := binary.LittleEndian.Uint64(faddr)
-
-	for i := uint64(0); i < allglen; i++ {
-		gvar, err := dbp.CurrentThread.newGVariable(uintptr(allgptr+(i*uint64(dbp.arch.PtrSize()))), true)
-		if err != nil {
-			return nil, err
-		}
-		g, err := gvar.parseG()
-		if err != nil {
-			return nil, err
-		}
-		if thread, allocated := threadg[g.ID]; allocated {
-			loc, err := thread.Location()
-			if err != nil {
-				return nil, err
-			}
-			g.thread = thread
-			// Prefer actual thread location information.
-			g.CurrentLoc = *loc
-		}
-		if g.Status != Gdead {
-			allg = append(allg, g)
-		}
-	}
-	dbp.allGCache = allg
-	return allg, nil
-}
-
-func (g *G) Thread() *Thread {
-	return g.thread
-}
-
-// Halt stops all threads.
-func (dbp *Process) Halt() (err error) {
-	if dbp.exited {
-		return &ProcessExitedError{}
-	}
-	for _, th := range dbp.Threads {
-		if err := th.Halt(); err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
-// Registers obtains register values from the
-// "current" thread of the traced process.
-func (dbp *Process) Registers() (Registers, error) {
-	return dbp.CurrentThread.Registers(false)
-}
-
-// PC returns the PC of the current thread.
-func (dbp *Process) PC() (uint64, error) {
-	return dbp.CurrentThread.PC()
-}
-
-// CurrentBreakpoint returns the breakpoint the current thread
-// is stopped at.
-func (dbp *Process) CurrentBreakpoint() *Breakpoint {
-	return dbp.CurrentThread.CurrentBreakpoint
-}
-
-// DwarfReader returns a reader for the dwarf data
-func (dbp *Process) DwarfReader() *reader.Reader {
-	return reader.New(dbp.dwarf)
-}
-
-// Sources returns list of source files that comprise the debugged binary.
-func (dbp *Process) Sources() map[string]*gosym.Obj {
-	return dbp.goSymTable.Files
-}
-
-// Funcs returns list of functions present in the debugged program.
-func (dbp *Process) Funcs() []gosym.Func {
-	return dbp.goSymTable.Funcs
-}
-
-// Types returns list of types present in the debugged program.
-func (dbp *Process) Types() ([]string, error) {
-	types := make([]string, 0, len(dbp.types))
-	for k := range dbp.types {
-		types = append(types, k)
-	}
-	return types, nil
-}
-
-// PCToLine converts an instruction address to a file/line/function.
-func (dbp *Process) PCToLine(pc uint64) (string, int, *gosym.Func) {
-	return dbp.goSymTable.PCToLine(pc)
-}
-
-// FindBreakpointByID finds the breakpoint for the given ID.
-func (dbp *Process) FindBreakpointByID(id int) (*Breakpoint, bool) {
-	for _, bp := range dbp.Breakpoints {
-		if bp.ID == id {
-			return bp, true
-		}
-	}
-	return nil, false
-}
-
-// FindBreakpoint finds the breakpoint for the given pc.
-func (dbp *Process) FindBreakpoint(pc uint64) (*Breakpoint, bool) {
-	// Check to see if address is past the breakpoint, (i.e. breakpoint was hit).
-	if bp, ok := dbp.Breakpoints[pc-uint64(dbp.arch.BreakpointSize())]; ok {
-		return bp, true
-	}
-	// Directly use addr to lookup breakpoint.
-	if bp, ok := dbp.Breakpoints[pc]; ok {
-		return bp, true
-	}
-	return nil, false
-}
-
-// Returns a new Process struct.
-func initializeDebugProcess(dbp *Process, path string, attach bool) (*Process, error) {
-	if attach {
-		var err error
-		dbp.execPtraceFunc(func() { err = PtraceAttach(dbp.Pid) })
-		if err != nil {
-			return nil, err
-		}
-		_, _, err = dbp.wait(dbp.Pid, 0)
-		if err != nil {
-			return nil, err
-		}
-	}
-
-	proc, err := os.FindProcess(dbp.Pid)
-	if err != nil {
-		return nil, err
-	}
-
-	dbp.Process = proc
-	err = dbp.LoadInformation(path)
-	if err != nil {
-		return nil, err
-	}
-
-	if err := dbp.updateThreadList(); err != nil {
-		return nil, err
-	}
-
-	ver, isextld, err := dbp.getGoInformation()
-	if err != nil {
-		return nil, err
-	}
-
-	dbp.arch.SetGStructOffset(ver, isextld)
-	// SelectedGoroutine can not be set correctly by the call to updateThreadList
-	// because without calling SetGStructOffset we can not read the G struct of CurrentThread
-	// but without calling updateThreadList we can not examine memory to determine
-	// the offset of g struct inside TLS
-	dbp.SelectedGoroutine, _ = dbp.CurrentThread.GetG()
-
-	panicpc, err := dbp.FindFunctionLocation("runtime.startpanic", true, 0)
-	if err == nil {
-		bp, err := dbp.SetBreakpoint(panicpc, UserBreakpoint, nil)
-		if err == nil {
-			bp.Name = "unrecovered-panic"
-			bp.ID = -1
-			dbp.breakpointIDCounter--
-		}
-	}
-
-	return dbp, nil
-}
-
-func (dbp *Process) ClearInternalBreakpoints() error {
-	for _, bp := range dbp.Breakpoints {
-		if !bp.Internal() {
-			continue
-		}
-		if _, err := dbp.ClearBreakpoint(bp.Addr); err != nil {
-			return err
-		}
-	}
-	for i := range dbp.Threads {
-		if dbp.Threads[i].CurrentBreakpoint != nil && dbp.Threads[i].CurrentBreakpoint.Internal() {
-			dbp.Threads[i].CurrentBreakpoint = nil
-		}
-	}
-	return nil
-}
-
-func (dbp *Process) handlePtraceFuncs() {
-	// We must ensure here that we are running on the same thread during
-	// while invoking the ptrace(2) syscall. This is due to the fact that ptrace(2) expects
-	// all commands after PTRACE_ATTACH to come from the same thread.
-	runtime.LockOSThread()
-
-	for fn := range dbp.ptraceChan {
-		fn()
-		dbp.ptraceDoneChan <- nil
-	}
-}
-
-func (dbp *Process) execPtraceFunc(fn func()) {
-	dbp.ptraceChan <- fn
-	<-dbp.ptraceDoneChan
-}
-
-func (dbp *Process) getGoInformation() (ver GoVersion, isextld bool, err error) {
-	vv, err := dbp.EvalPackageVariable("runtime.buildVersion", LoadConfig{true, 0, 64, 0, 0})
-	if err != nil {
-		err = fmt.Errorf("Could not determine version number: %v\n", err)
-		return
-	}
-	if vv.Unreadable != nil {
-		err = fmt.Errorf("Unreadable version number: %v\n", vv.Unreadable)
-		return
-	}
-
-	ver, ok := ParseVersionString(constant.StringVal(vv.Value))
-	if !ok {
-		err = fmt.Errorf("Could not parse version number: %v\n", vv.Value)
-		return
-	}
-
-	rdr := dbp.DwarfReader()
-	rdr.Seek(0)
-	for entry, err := rdr.NextCompileUnit(); entry != nil; entry, err = rdr.NextCompileUnit() {
-		if err != nil {
-			return ver, isextld, err
-		}
-		if prod, ok := entry.Val(dwarf.AttrProducer).(string); ok && (strings.HasPrefix(prod, "GNU AS")) {
-			isextld = true
-			break
-		}
-	}
-	return
-}
-
-// FindGoroutine returns a G struct representing the goroutine
-// specified by `gid`.
-func (dbp *Process) FindGoroutine(gid int) (*G, error) {
-	if gid == -1 {
-		return dbp.SelectedGoroutine, nil
-	}
-
-	gs, err := dbp.GoroutinesInfo()
-	if err != nil {
-		return nil, err
-	}
-	for i := range gs {
-		if gs[i].ID == gid {
-			return gs[i], nil
-		}
-	}
-	return nil, fmt.Errorf("Unknown goroutine %d", gid)
-}
-
-// ConvertEvalScope returns a new EvalScope in the context of the
-// specified goroutine ID and stack frame.
-func (dbp *Process) ConvertEvalScope(gid, frame int) (*EvalScope, error) {
-	if dbp.exited {
-		return nil, &ProcessExitedError{}
-	}
-	g, err := dbp.FindGoroutine(gid)
-	if err != nil {
-		return nil, err
-	}
-	if g == nil {
-		return dbp.CurrentThread.Scope()
-	}
-
-	var out EvalScope
-
-	if g.thread == nil {
-		out.Thread = dbp.CurrentThread
-	} else {
-		out.Thread = g.thread
-	}
-
-	locs, err := g.Stacktrace(frame)
-	if err != nil {
-		return nil, err
-	}
-
-	if frame >= len(locs) {
-		return nil, fmt.Errorf("Frame %d does not exist in goroutine %d", frame, gid)
-	}
-
-	out.PC, out.CFA = locs[frame].Current.PC, locs[frame].CFA
-
-	return &out, nil
-}
-
-func (dbp *Process) postExit() {
-	dbp.exited = true
-	close(dbp.ptraceChan)
-	close(dbp.ptraceDoneChan)
-}

vendor/github.com/derekparker/delve/proc/proc_windows.go

@@ -1,643 +0,0 @@
-package proc
-
-import (
-	"debug/gosym"
-	"debug/pe"
-	"errors"
-	"fmt"
-	"os"
-	"os/exec"
-	"path/filepath"
-	"sync"
-	"syscall"
-	"unsafe"
-
-	sys "golang.org/x/sys/windows"
-
-	"github.com/derekparker/delve/dwarf/frame"
-	"github.com/derekparker/delve/dwarf/line"
-	"golang.org/x/debug/dwarf"
-)
-
-// OSProcessDetails holds Windows specific information.
-type OSProcessDetails struct {
-	hProcess    syscall.Handle
-	breakThread int
-}
-
-// Launch creates and begins debugging a new process.
-func Launch(cmd []string, wd string) (*Process, error) {
-	argv0Go, err := filepath.Abs(cmd[0])
-	if err != nil {
-		return nil, err
-	}
-
-	// Make sure the binary exists and is an executable file
-	if filepath.Base(cmd[0]) == cmd[0] {
-		if _, err := exec.LookPath(cmd[0]); err != nil {
-			return nil, err
-		}
-	}
-
-	peFile, err := openExecutablePath(argv0Go)
-	if err != nil {
-		return nil, NotExecutableErr
-	}
-	peFile.Close()
-
-	// Duplicate the stdin/stdout/stderr handles
-	files := []uintptr{uintptr(syscall.Stdin), uintptr(syscall.Stdout), uintptr(syscall.Stderr)}
-	p, _ := syscall.GetCurrentProcess()
-	fd := make([]syscall.Handle, len(files))
-	for i := range files {
-		err := syscall.DuplicateHandle(p, syscall.Handle(files[i]), p, &fd[i], 0, true, syscall.DUPLICATE_SAME_ACCESS)
-		if err != nil {
-			return nil, err
-		}
-		defer syscall.CloseHandle(syscall.Handle(fd[i]))
-	}
-
-	argv0, err := syscall.UTF16PtrFromString(argv0Go)
-	if err != nil {
-		return nil, err
-	}
-
-	// create suitable command line for CreateProcess
-	// see https://github.com/golang/go/blob/master/src/syscall/exec_windows.go#L326
-	// adapted from standard library makeCmdLine
-	// see https://github.com/golang/go/blob/master/src/syscall/exec_windows.go#L86
-	var cmdLineGo string
-	if len(cmd) >= 1 {
-		for _, v := range cmd {
-			if cmdLineGo != "" {
-				cmdLineGo += " "
-			}
-			cmdLineGo += syscall.EscapeArg(v)
-		}
-	}
-
-	var cmdLine *uint16
-	if cmdLineGo != "" {
-		if cmdLine, err = syscall.UTF16PtrFromString(cmdLineGo); err != nil {
-			return nil, err
-		}
-	}
-
-	var workingDir *uint16
-	if wd != "" {
-		if workingDir, err = syscall.UTF16PtrFromString(wd); err != nil {
-			return nil, err
-		}
-	}
-
-	// Initialize the startup info and create process
-	si := new(sys.StartupInfo)
-	si.Cb = uint32(unsafe.Sizeof(*si))
-	si.Flags = syscall.STARTF_USESTDHANDLES
-	si.StdInput = sys.Handle(fd[0])
-	si.StdOutput = sys.Handle(fd[1])
-	si.StdErr = sys.Handle(fd[2])
-	pi := new(sys.ProcessInformation)
-
-	dbp := New(0)
-	dbp.execPtraceFunc(func() {
-		if wd == "" {
-			err = sys.CreateProcess(argv0, cmdLine, nil, nil, true, _DEBUG_ONLY_THIS_PROCESS, nil, nil, si, pi)
-		} else {
-			err = sys.CreateProcess(argv0, cmdLine, nil, nil, true, _DEBUG_ONLY_THIS_PROCESS, nil, workingDir, si, pi)
-		}
-	})
-	if err != nil {
-		return nil, err
-	}
-	sys.CloseHandle(sys.Handle(pi.Process))
-	sys.CloseHandle(sys.Handle(pi.Thread))
-
-	dbp.Pid = int(pi.ProcessId)
-
-	return newDebugProcess(dbp, argv0Go)
-}
-
-// newDebugProcess prepares process pid for debugging.
-func newDebugProcess(dbp *Process, exepath string) (*Process, error) {
-	// It should not actually be possible for the
-	// call to waitForDebugEvent to fail, since Windows
-	// will always fire a CREATE_PROCESS_DEBUG_EVENT event
-	// immediately after launching under DEBUG_ONLY_THIS_PROCESS.
-	// Attaching with DebugActiveProcess has similar effect.
-	var err error
-	var tid, exitCode int
-	dbp.execPtraceFunc(func() {
-		tid, exitCode, err = dbp.waitForDebugEvent(waitBlocking)
-	})
-	if err != nil {
-		return nil, err
-	}
-	if tid == 0 {
-		dbp.postExit()
-		return nil, ProcessExitedError{Pid: dbp.Pid, Status: exitCode}
-	}
-	// Suspend all threads so that the call to _ContinueDebugEvent will
-	// not resume the target.
-	for _, thread := range dbp.Threads {
-		_, err := _SuspendThread(thread.os.hThread)
-		if err != nil {
-			return nil, err
-		}
-	}
-
-	dbp.execPtraceFunc(func() {
-		err = _ContinueDebugEvent(uint32(dbp.Pid), uint32(dbp.os.breakThread), _DBG_CONTINUE)
-	})
-	if err != nil {
-		return nil, err
-	}
-
-	return initializeDebugProcess(dbp, exepath, false)
-}
-
-// findExePath searches for process pid, and returns its executable path.
-func findExePath(pid int) (string, error) {
-	// Original code suggested different approach (see below).
-	// Maybe it could be useful in the future.
-	//
-	// Find executable path from PID/handle on Windows:
-	// https://msdn.microsoft.com/en-us/library/aa366789(VS.85).aspx
-
-	p, err := syscall.OpenProcess(syscall.PROCESS_QUERY_INFORMATION, false, uint32(pid))
-	if err != nil {
-		return "", err
-	}
-	defer syscall.CloseHandle(p)
-
-	n := uint32(128)
-	for {
-		buf := make([]uint16, int(n))
-		err = _QueryFullProcessImageName(p, 0, &buf[0], &n)
-		switch err {
-		case syscall.ERROR_INSUFFICIENT_BUFFER:
-			// try bigger buffer
-			n *= 2
-			// but stop if it gets too big
-			if n > 10000 {
-				return "", err
-			}
-		case nil:
-			return syscall.UTF16ToString(buf[:n]), nil
-		default:
-			return "", err
-		}
-	}
-}
-
-// Attach to an existing process with the given PID.
-func Attach(pid int) (*Process, error) {
-	// TODO: Probably should have SeDebugPrivilege before starting here.
-	err := _DebugActiveProcess(uint32(pid))
-	if err != nil {
-		return nil, err
-	}
-	exepath, err := findExePath(pid)
-	if err != nil {
-		return nil, err
-	}
-	return newDebugProcess(New(pid), exepath)
-}
-
-// Kill kills the process.
-func (dbp *Process) Kill() error {
-	if dbp.exited {
-		return nil
-	}
-	if !dbp.Threads[dbp.Pid].Stopped() {
-		return errors.New("process must be stopped in order to kill it")
-	}
-	// TODO: Should not have to ignore failures here,
-	// but some tests appear to Kill twice causing
-	// this to fail on second attempt.
-	_ = syscall.TerminateProcess(dbp.os.hProcess, 1)
-	dbp.exited = true
-	return nil
-}
-
-func (dbp *Process) requestManualStop() error {
-	return _DebugBreakProcess(dbp.os.hProcess)
-}
-
-func (dbp *Process) updateThreadList() error {
-	// We ignore this request since threads are being
-	// tracked as they are created/killed in waitForDebugEvent.
-	return nil
-}
-
-func (dbp *Process) addThread(hThread syscall.Handle, threadID int, attach, suspendNewThreads bool) (*Thread, error) {
-	if thread, ok := dbp.Threads[threadID]; ok {
-		return thread, nil
-	}
-	thread := &Thread{
-		ID:  threadID,
-		dbp: dbp,
-		os:  new(OSSpecificDetails),
-	}
-	thread.os.hThread = hThread
-	dbp.Threads[threadID] = thread
-	if dbp.CurrentThread == nil {
-		dbp.SwitchThread(thread.ID)
-	}
-	if suspendNewThreads {
-		_, err := _SuspendThread(thread.os.hThread)
-		if err != nil {
-			return nil, err
-		}
-	}
-	return thread, nil
-}
-
-func (dbp *Process) parseDebugFrame(exe *pe.File, wg *sync.WaitGroup) {
-	defer wg.Done()
-
-	debugFrameSec := exe.Section(".debug_frame")
-	debugInfoSec := exe.Section(".debug_info")
-
-	if debugFrameSec != nil && debugInfoSec != nil {
-		debugFrame, err := debugFrameSec.Data()
-		if err != nil && uint32(len(debugFrame)) < debugFrameSec.Size {
-			fmt.Println("could not get .debug_frame section", err)
-			os.Exit(1)
-		}
-		if 0 < debugFrameSec.VirtualSize && debugFrameSec.VirtualSize < debugFrameSec.Size {
-			debugFrame = debugFrame[:debugFrameSec.VirtualSize]
-		}
-		dat, err := debugInfoSec.Data()
-		if err != nil {
-			fmt.Println("could not get .debug_info section", err)
-			os.Exit(1)
-		}
-		dbp.frameEntries = frame.Parse(debugFrame, frame.DwarfEndian(dat))
-	} else {
-		fmt.Println("could not find .debug_frame section in binary")
-		os.Exit(1)
-	}
-}
-
-// Borrowed from https://golang.org/src/cmd/internal/objfile/pe.go
-func findPESymbol(f *pe.File, name string) (*pe.Symbol, error) {
-	for _, s := range f.Symbols {
-		if s.Name != name {
-			continue
-		}
-		if s.SectionNumber <= 0 {
-			return nil, fmt.Errorf("symbol %s: invalid section number %d", name, s.SectionNumber)
-		}
-		if len(f.Sections) < int(s.SectionNumber) {
-			return nil, fmt.Errorf("symbol %s: section number %d is larger than max %d", name, s.SectionNumber, len(f.Sections))
-		}
-		return s, nil
-	}
-	return nil, fmt.Errorf("no %s symbol found", name)
-}
-
-// Borrowed from https://golang.org/src/cmd/internal/objfile/pe.go
-func loadPETable(f *pe.File, sname, ename string) ([]byte, error) {
-	ssym, err := findPESymbol(f, sname)
-	if err != nil {
-		return nil, err
-	}
-	esym, err := findPESymbol(f, ename)
-	if err != nil {
-		return nil, err
-	}
-	if ssym.SectionNumber != esym.SectionNumber {
-		return nil, fmt.Errorf("%s and %s symbols must be in the same section", sname, ename)
-	}
-	sect := f.Sections[ssym.SectionNumber-1]
-	data, err := sect.Data()
-	if err != nil {
-		return nil, err
-	}
-	return data[ssym.Value:esym.Value], nil
-}
-
-// Borrowed from https://golang.org/src/cmd/internal/objfile/pe.go
-func pcln(exe *pe.File) (textStart uint64, symtab, pclntab []byte, err error) {
-	var imageBase uint64
-	switch oh := exe.OptionalHeader.(type) {
-	case *pe.OptionalHeader32:
-		imageBase = uint64(oh.ImageBase)
-	case *pe.OptionalHeader64:
-		imageBase = oh.ImageBase
-	default:
-		return 0, nil, nil, fmt.Errorf("pe file format not recognized")
-	}
-	if sect := exe.Section(".text"); sect != nil {
-		textStart = imageBase + uint64(sect.VirtualAddress)
-	}
-	if pclntab, err = loadPETable(exe, "runtime.pclntab", "runtime.epclntab"); err != nil {
-		// We didn't find the symbols, so look for the names used in 1.3 and earlier.
-		// TODO: Remove code looking for the old symbols when we no longer care about 1.3.
-		var err2 error
-		if pclntab, err2 = loadPETable(exe, "pclntab", "epclntab"); err2 != nil {
-			return 0, nil, nil, err
-		}
-	}
-	if symtab, err = loadPETable(exe, "runtime.symtab", "runtime.esymtab"); err != nil {
-		// Same as above.
-		var err2 error
-		if symtab, err2 = loadPETable(exe, "symtab", "esymtab"); err2 != nil {
-			return 0, nil, nil, err
-		}
-	}
-	return textStart, symtab, pclntab, nil
-}
-
-func (dbp *Process) obtainGoSymbols(exe *pe.File, wg *sync.WaitGroup) {
-	defer wg.Done()
-
-	_, symdat, pclndat, err := pcln(exe)
-	if err != nil {
-		fmt.Println("could not get Go symbols", err)
-		os.Exit(1)
-	}
-
-	pcln := gosym.NewLineTable(pclndat, uint64(exe.Section(".text").Offset))
-	tab, err := gosym.NewTable(symdat, pcln)
-	if err != nil {
-		fmt.Println("could not get initialize line table", err)
-		os.Exit(1)
-	}
-
-	dbp.goSymTable = tab
-}
-
-func (dbp *Process) parseDebugLineInfo(exe *pe.File, wg *sync.WaitGroup) {
-	defer wg.Done()
-
-	if sec := exe.Section(".debug_line"); sec != nil {
-		debugLine, err := sec.Data()
-		if err != nil && uint32(len(debugLine)) < sec.Size {
-			fmt.Println("could not get .debug_line section", err)
-			os.Exit(1)
-		}
-		if 0 < sec.VirtualSize && sec.VirtualSize < sec.Size {
-			debugLine = debugLine[:sec.VirtualSize]
-		}
-		dbp.lineInfo = line.Parse(debugLine)
-	} else {
-		fmt.Println("could not find .debug_line section in binary")
-		os.Exit(1)
-	}
-}
-
-var UnsupportedArchErr = errors.New("unsupported architecture of windows/386 - only windows/amd64 is supported")
-
-func (dbp *Process) findExecutable(path string) (*pe.File, string, error) {
-	peFile, err := openExecutablePath(path)
-	if err != nil {
-		return nil, path, err
-	}
-	if peFile.Machine != pe.IMAGE_FILE_MACHINE_AMD64 {
-		return nil, path, UnsupportedArchErr
-	}
-	dbp.dwarf, err = dwarfFromPE(peFile)
-	if err != nil {
-		return nil, path, err
-	}
-	return peFile, path, nil
-}
-
-func openExecutablePath(path string) (*pe.File, error) {
-	f, err := os.OpenFile(path, 0, os.ModePerm)
-	if err != nil {
-		return nil, err
-	}
-	return pe.NewFile(f)
-}
-
-// Adapted from src/debug/pe/file.go: pe.(*File).DWARF()
-func dwarfFromPE(f *pe.File) (*dwarf.Data, error) {
-	// There are many other DWARF sections, but these
-	// are the ones the debug/dwarf package uses.
-	// Don't bother loading others.
-	var names = [...]string{"abbrev", "info", "line", "str"}
-	var dat [len(names)][]byte
-	for i, name := range names {
-		name = ".debug_" + name
-		s := f.Section(name)
-		if s == nil {
-			continue
-		}
-		b, err := s.Data()
-		if err != nil && uint32(len(b)) < s.Size {
-			return nil, err
-		}
-		if 0 < s.VirtualSize && s.VirtualSize < s.Size {
-			b = b[:s.VirtualSize]
-		}
-		dat[i] = b
-	}
-
-	abbrev, info, line, str := dat[0], dat[1], dat[2], dat[3]
-	return dwarf.New(abbrev, nil, nil, info, line, nil, nil, str)
-}
-
-type waitForDebugEventFlags int
-
-const (
-	waitBlocking waitForDebugEventFlags = 1 << iota
-	waitSuspendNewThreads
-)
-
-func (dbp *Process) waitForDebugEvent(flags waitForDebugEventFlags) (threadID, exitCode int, err error) {
-	var debugEvent _DEBUG_EVENT
-	shouldExit := false
-	for {
-		continueStatus := uint32(_DBG_CONTINUE)
-		var milliseconds uint32 = 0
-		if flags&waitBlocking != 0 {
-			milliseconds = syscall.INFINITE
-		}
-		// Wait for a debug event...
-		err := _WaitForDebugEvent(&debugEvent, milliseconds)
-		if err != nil {
-			return 0, 0, err
-		}
-
-		// ... handle each event kind ...
-		unionPtr := unsafe.Pointer(&debugEvent.U[0])
-		switch debugEvent.DebugEventCode {
-		case _CREATE_PROCESS_DEBUG_EVENT:
-			debugInfo := (*_CREATE_PROCESS_DEBUG_INFO)(unionPtr)
-			hFile := debugInfo.File
-			if hFile != 0 && hFile != syscall.InvalidHandle {
-				err = syscall.CloseHandle(hFile)
-				if err != nil {
-					return 0, 0, err
-				}
-			}
-			dbp.os.hProcess = debugInfo.Process
-			_, err = dbp.addThread(debugInfo.Thread, int(debugEvent.ThreadId), false, flags&waitSuspendNewThreads != 0)
-			if err != nil {
-				return 0, 0, err
-			}
-			break
-		case _CREATE_THREAD_DEBUG_EVENT:
-			debugInfo := (*_CREATE_THREAD_DEBUG_INFO)(unionPtr)
-			_, err = dbp.addThread(debugInfo.Thread, int(debugEvent.ThreadId), false, flags&waitSuspendNewThreads != 0)
-			if err != nil {
-				return 0, 0, err
-			}
-			break
-		case _EXIT_THREAD_DEBUG_EVENT:
-			delete(dbp.Threads, int(debugEvent.ThreadId))
-			break
-		case _OUTPUT_DEBUG_STRING_EVENT:
-			//TODO: Handle debug output strings
-			break
-		case _LOAD_DLL_DEBUG_EVENT:
-			debugInfo := (*_LOAD_DLL_DEBUG_INFO)(unionPtr)
-			hFile := debugInfo.File
-			if hFile != 0 && hFile != syscall.InvalidHandle {
-				err = syscall.CloseHandle(hFile)
-				if err != nil {
-					return 0, 0, err
-				}
-			}
-			break
-		case _UNLOAD_DLL_DEBUG_EVENT:
-			break
-		case _RIP_EVENT:
-			break
-		case _EXCEPTION_DEBUG_EVENT:
-			exception := (*_EXCEPTION_DEBUG_INFO)(unionPtr)
-			if code := exception.ExceptionRecord.ExceptionCode; code == _EXCEPTION_BREAKPOINT || code == _EXCEPTION_SINGLE_STEP {
-				tid := int(debugEvent.ThreadId)
-				dbp.os.breakThread = tid
-				return tid, 0, nil
-			} else {
-				continueStatus = _DBG_EXCEPTION_NOT_HANDLED
-			}
-		case _EXIT_PROCESS_DEBUG_EVENT:
-			debugInfo := (*_EXIT_PROCESS_DEBUG_INFO)(unionPtr)
-			exitCode = int(debugInfo.ExitCode)
-			shouldExit = true
-		default:
-			return 0, 0, fmt.Errorf("unknown debug event code: %d", debugEvent.DebugEventCode)
-		}
-
-		// .. and then continue unless we received an event that indicated we should break into debugger.
-		err = _ContinueDebugEvent(debugEvent.ProcessId, debugEvent.ThreadId, continueStatus)
-		if err != nil {
-			return 0, 0, err
-		}
-
-		if shouldExit {
-			return 0, exitCode, nil
-		}
-	}
-}
-
-func (dbp *Process) trapWait(pid int) (*Thread, error) {
-	var err error
-	var tid, exitCode int
-	dbp.execPtraceFunc(func() {
-		tid, exitCode, err = dbp.waitForDebugEvent(waitBlocking)
-	})
-	if err != nil {
-		return nil, err
-	}
-	if tid == 0 {
-		dbp.postExit()
-		return nil, ProcessExitedError{Pid: dbp.Pid, Status: exitCode}
-	}
-	th := dbp.Threads[tid]
-	return th, nil
-}
-
-func (dbp *Process) loadProcessInformation(wg *sync.WaitGroup) {
-	wg.Done()
-}
-
-func (dbp *Process) wait(pid, options int) (int, *sys.WaitStatus, error) {
-	return 0, nil, fmt.Errorf("not implemented: wait")
-}
-
-func (dbp *Process) setCurrentBreakpoints(trapthread *Thread) error {
-	// While the debug event that stopped the target was being propagated
-	// other target threads could generate other debug events.
-	// After this function we need to know about all the threads
-	// stopped on a breakpoint. To do that we first suspend all target
-	// threads and then repeatedly call _ContinueDebugEvent followed by
-	// waitForDebugEvent in non-blocking mode.
-	// We need to explicitly call SuspendThread because otherwise the
-	// call to _ContinueDebugEvent will resume execution of some of the
-	// target threads.
-
-	err := trapthread.SetCurrentBreakpoint()
-	if err != nil {
-		return err
-	}
-
-	for _, thread := range dbp.Threads {
-		thread.running = false
-		_, err := _SuspendThread(thread.os.hThread)
-		if err != nil {
-			return err
-		}
-	}
-
-	for {
-		var err error
-		var tid int
-		dbp.execPtraceFunc(func() {
-			err = _ContinueDebugEvent(uint32(dbp.Pid), uint32(dbp.os.breakThread), _DBG_CONTINUE)
-			if err == nil {
-				tid, _, _ = dbp.waitForDebugEvent(waitSuspendNewThreads)
-			}
-		})
-		if err != nil {
-			return err
-		}
-		if tid == 0 {
-			break
-		}
-		err = dbp.Threads[tid].SetCurrentBreakpoint()
-		if err != nil {
-			return err
-		}
-	}
-
-	return nil
-}
-
-func (dbp *Process) exitGuard(err error) error {
-	return err
-}
-
-func (dbp *Process) resume() error {
-	for _, thread := range dbp.Threads {
-		if thread.CurrentBreakpoint != nil {
-			if err := thread.StepInstruction(); err != nil {
-				return err
-			}
-			thread.CurrentBreakpoint = nil
-		}
-	}
-
-	for _, thread := range dbp.Threads {
-		thread.running = true
-		_, err := _ResumeThread(thread.os.hThread)
-		if err != nil {
-			return err
-		}
-	}
-
-	return nil
-}
-
-func killProcess(pid int) error {
-	p, err := os.FindProcess(pid)
-	if err != nil {
-		return err
-	}
-	return p.Kill()
-}

vendor/github.com/derekparker/delve/proc/ptrace_windows.go

@@ -1,13 +0,0 @@
-package proc
-
-import (
-	"fmt"
-)
-
-func PtraceAttach(pid int) error {
-	return fmt.Errorf("not implemented: PtraceAttach")
-}
-
-func PtraceDetach(tid, sig int) error {
-	return _DebugActiveProcessStop(uint32(tid))
-}

vendor/github.com/derekparker/delve/proc/registers.go

@@ -1,230 +0,0 @@
-package proc
-
-import (
-	"bytes"
-	"encoding/binary"
-	"errors"
-	"fmt"
-	"math"
-	"os"
-	"strings"
-)
-
-// Registers is an interface for a generic register type. The
-// interface encapsulates the generic values / actions
-// we need independent of arch. The concrete register types
-// will be different depending on OS/Arch.
-type Registers interface {
-	PC() uint64
-	SP() uint64
-	CX() uint64
-	TLS() uint64
-	Get(int) (uint64, error)
-	SetPC(*Thread, uint64) error
-	Slice() []Register
-}
-
-type Register struct {
-	Name  string
-	Value string
-}
-
-func appendWordReg(regs []Register, name string, value uint16) []Register {
-	return append(regs, Register{name, fmt.Sprintf("%#04x", value)})
-}
-
-func appendDwordReg(regs []Register, name string, value uint32) []Register {
-	return append(regs, Register{name, fmt.Sprintf("%#08x", value)})
-}
-
-func appendQwordReg(regs []Register, name string, value uint64) []Register {
-	return append(regs, Register{name, fmt.Sprintf("%#016x", value)})
-}
-
-func appendFlagReg(regs []Register, name string, value uint64, descr flagRegisterDescr, size int) []Register {
-	return append(regs, Register{name, descr.Describe(value, size)})
-}
-
-func appendX87Reg(regs []Register, index int, exponent uint16, mantissa uint64) []Register {
-	var f float64
-	fset := false
-
-	const (
-		_SIGNBIT    = 1 << 15
-		_EXP_BIAS   = (1 << 14) - 1 // 2^(n-1) - 1 = 16383
-		_SPECIALEXP = (1 << 15) - 1 // all bits set
-		_HIGHBIT    = 1 << 63
-		_QUIETBIT   = 1 << 62
-	)
-
-	sign := 1.0
-	if exponent&_SIGNBIT != 0 {
-		sign = -1.0
-	}
-	exponent &= ^uint16(_SIGNBIT)
-
-	NaN := math.NaN()
-	Inf := math.Inf(+1)
-
-	switch exponent {
-	case 0:
-		switch {
-		case mantissa == 0:
-			f = sign * 0.0
-			fset = true
-		case mantissa&_HIGHBIT != 0:
-			f = NaN
-			fset = true
-		}
-	case _SPECIALEXP:
-		switch {
-		case mantissa&_HIGHBIT == 0:
-			f = sign * Inf
-			fset = true
-		default:
-			f = NaN // signaling NaN
-			fset = true
-		}
-	default:
-		if mantissa&_HIGHBIT == 0 {
-			f = NaN
-			fset = true
-		}
-	}
-
-	if !fset {
-		significand := float64(mantissa) / (1 << 63)
-		f = sign * math.Ldexp(significand, int(exponent-_EXP_BIAS))
-	}
-
-	return append(regs, Register{fmt.Sprintf("ST(%d)", index), fmt.Sprintf("%#04x%016x\t%g", exponent, mantissa, f)})
-}
-
-func appendSSEReg(regs []Register, name string, xmm []byte) []Register {
-	buf := bytes.NewReader(xmm)
-
-	var out bytes.Buffer
-	var vi [16]uint8
-	for i := range vi {
-		binary.Read(buf, binary.LittleEndian, &vi[i])
-	}
-
-	fmt.Fprintf(&out, "0x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", vi[15], vi[14], vi[13], vi[12], vi[11], vi[10], vi[9], vi[8], vi[7], vi[6], vi[5], vi[4], vi[3], vi[2], vi[1], vi[0])
-
-	fmt.Fprintf(&out, "\tv2_int={ %02x%02x%02x%02x%02x%02x%02x%02x %02x%02x%02x%02x%02x%02x%02x%02x }", vi[7], vi[6], vi[5], vi[4], vi[3], vi[2], vi[1], vi[0], vi[15], vi[14], vi[13], vi[12], vi[11], vi[10], vi[9], vi[8])
-
-	fmt.Fprintf(&out, "\tv4_int={ %02x%02x%02x%02x %02x%02x%02x%02x %02x%02x%02x%02x %02x%02x%02x%02x }", vi[3], vi[2], vi[1], vi[0], vi[7], vi[6], vi[5], vi[4], vi[11], vi[10], vi[9], vi[8], vi[15], vi[14], vi[13], vi[12])
-
-	fmt.Fprintf(&out, "\tv8_int={ %02x%02x %02x%02x %02x%02x %02x%02x %02x%02x %02x%02x %02x%02x %02x%02x }", vi[1], vi[0], vi[3], vi[2], vi[5], vi[4], vi[7], vi[6], vi[9], vi[8], vi[11], vi[10], vi[13], vi[12], vi[15], vi[14])
-
-	fmt.Fprintf(&out, "\tv16_int={ %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x }", vi[0], vi[1], vi[2], vi[3], vi[4], vi[5], vi[6], vi[7], vi[8], vi[9], vi[10], vi[11], vi[12], vi[13], vi[14], vi[15])
-
-	buf.Seek(0, os.SEEK_SET)
-	var v2 [2]float64
-	for i := range v2 {
-		binary.Read(buf, binary.LittleEndian, &v2[i])
-	}
-	fmt.Fprintf(&out, "\tv2_float={ %g %g }", v2[0], v2[1])
-
-	buf.Seek(0, os.SEEK_SET)
-	var v4 [4]float32
-	for i := range v4 {
-		binary.Read(buf, binary.LittleEndian, &v4[i])
-	}
-	fmt.Fprintf(&out, "\tv4_float={ %g %g %g %g }", v4[0], v4[1], v4[2], v4[3])
-
-	return append(regs, Register{name, out.String()})
-}
-
-var UnknownRegisterError = errors.New("unknown register")
-
-// Registers obtains register values from the debugged process.
-func (t *Thread) Registers(floatingPoint bool) (Registers, error) {
-	return registers(t, floatingPoint)
-}
-
-// PC returns the current PC for this thread.
-func (t *Thread) PC() (uint64, error) {
-	regs, err := t.Registers(false)
-	if err != nil {
-		return 0, err
-	}
-	return regs.PC(), nil
-}
-
-type flagRegisterDescr []flagDescr
-type flagDescr struct {
-	name string
-	mask uint64
-}
-
-var mxcsrDescription flagRegisterDescr = []flagDescr{
-	{"FZ", 1 << 15},
-	{"RZ/RN", 1<<14 | 1<<13},
-	{"PM", 1 << 12},
-	{"UM", 1 << 11},
-	{"OM", 1 << 10},
-	{"ZM", 1 << 9},
-	{"DM", 1 << 8},
-	{"IM", 1 << 7},
-	{"DAZ", 1 << 6},
-	{"PE", 1 << 5},
-	{"UE", 1 << 4},
-	{"OE", 1 << 3},
-	{"ZE", 1 << 2},
-	{"DE", 1 << 1},
-	{"IE", 1 << 0},
-}
-
-var eflagsDescription flagRegisterDescr = []flagDescr{
-	{"CF", 1 << 0},
-	{"", 1 << 1},
-	{"PF", 1 << 2},
-	{"AF", 1 << 4},
-	{"ZF", 1 << 6},
-	{"SF", 1 << 7},
-	{"TF", 1 << 8},
-	{"IF", 1 << 9},
-	{"DF", 1 << 10},
-	{"OF", 1 << 11},
-	{"IOPL", 1<<12 | 1<<13},
-	{"NT", 1 << 14},
-	{"RF", 1 << 16},
-	{"VM", 1 << 17},
-	{"AC", 1 << 18},
-	{"VIF", 1 << 19},
-	{"VIP", 1 << 20},
-	{"ID", 1 << 21},
-}
-
-func (descr flagRegisterDescr) Mask() uint64 {
-	var r uint64
-	for _, f := range descr {
-		r = r | f.mask
-	}
-	return r
-}
-
-func (descr flagRegisterDescr) Describe(reg uint64, bitsize int) string {
-	var r []string
-	for _, f := range descr {
-		if f.name == "" {
-			continue
-		}
-		// rbm is f.mask with only the right-most bit set:
-		// 0001 1100 -> 0000 0100
-		rbm := f.mask & -f.mask
-		if rbm == f.mask {
-			if reg&f.mask != 0 {
-				r = append(r, f.name)
-			}
-		} else {
-			x := (reg & f.mask) >> uint64(math.Log2(float64(rbm)))
-			r = append(r, fmt.Sprintf("%s=%x", f.name, x))
-		}
-	}
-	if reg & ^descr.Mask() != 0 {
-		r = append(r, fmt.Sprintf("unknown_flags=%x", reg&^descr.Mask()))
-	}
-	return fmt.Sprintf("%#0*x\t[%s]", bitsize/4, reg, strings.Join(r, " "))
-}