Use Delve v0.12.1 instead of master

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

@@ -0,0 +1,183 @@
+package proc
+
+import (
+	"debug/gosym"
+	"encoding/binary"
+	"rsc.io/x86/x86asm"
+)
+
+var maxInstructionLength uint64 = 15
+
+type ArchInst x86asm.Inst
+
+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)
+	return &r, nil
+}
+
+func (inst *ArchInst) Size() int {
+	return inst.Len
+}
+
+// converts PC relative arguments to absolute addresses
+func patchPCRel(pc uint64, inst *x86asm.Inst) {
+	for i := range inst.Args {
+		rel, isrel := inst.Args[i].(x86asm.Rel)
+		if isrel {
+			inst.Args[i] = x86asm.Imm(int64(pc) + int64(rel) + int64(inst.Len))
+		}
+	}
+	return
+}
+
+func (inst *AsmInstruction) Text(flavour AssemblyFlavour) string {
+	if inst.Inst == nil {
+		return "?"
+	}
+
+	var text string
+
+	switch flavour {
+	case GNUFlavour:
+		text = x86asm.GNUSyntax(x86asm.Inst(*inst.Inst))
+	case IntelFlavour:
+		fallthrough
+	default:
+		text = x86asm.IntelSyntax(x86asm.Inst(*inst.Inst))
+	}
+
+	if inst.IsCall() && inst.DestLoc != nil && inst.DestLoc.Fn != nil {
+		text += " " + inst.DestLoc.Fn.Name
+	}
+
+	return text
+}
+
+func (inst *AsmInstruction) IsCall() bool {
+	return inst.Inst.Op == x86asm.CALL || inst.Inst.Op == x86asm.LCALL
+}
+
+func (thread *Thread) resolveCallArg(inst *ArchInst, currentGoroutine bool, regs Registers) *Location {
+	if inst.Op != x86asm.CALL && inst.Op != x86asm.LCALL {
+		return nil
+	}
+
+	var pc uint64
+	var err error
+
+	switch arg := inst.Args[0].(type) {
+	case x86asm.Imm:
+		pc = uint64(arg)
+	case x86asm.Reg:
+		if !currentGoroutine || regs == nil {
+			return nil
+		}
+		pc, err = regs.Get(int(arg))
+		if err != nil {
+			return nil
+		}
+	case x86asm.Mem:
+		if !currentGoroutine || regs == nil {
+			return nil
+		}
+		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 {
+			return nil
+		}
+		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)
+		if err != nil {
+			return nil
+		}
+		pc = binary.LittleEndian.Uint64(pcbytes)
+	default:
+		return nil
+	}
+
+	file, line, fn := thread.dbp.PCToLine(pc)
+	if fn == nil {
+		return nil
+	}
+	return &Location{PC: pc, File: file, Line: line, Fn: fn}
+}
+
+type instrseq []x86asm.Op
+
+// Possible stacksplit prologues are inserted by stacksplit in
+// $GOROOT/src/cmd/internal/obj/x86/obj6.go.
+// The stacksplit prologue will always begin with loading curg in CX, this
+// instruction is added by load_g_cx in the same file and is either 1 or 2
+// MOVs.
+var prologues []instrseq
+
+func init() {
+	var tinyStacksplit = instrseq{x86asm.CMP, x86asm.JBE}
+	var smallStacksplit = instrseq{x86asm.LEA, x86asm.CMP, x86asm.JBE}
+	var bigStacksplit = instrseq{x86asm.MOV, x86asm.CMP, x86asm.JE, x86asm.LEA, x86asm.SUB, x86asm.CMP, x86asm.JBE}
+	var unixGetG = instrseq{x86asm.MOV}
+	var windowsGetG = instrseq{x86asm.MOV, x86asm.MOV}
+
+	prologues = make([]instrseq, 0, 2*3)
+	for _, getG := range []instrseq{unixGetG, windowsGetG} {
+		for _, stacksplit := range []instrseq{tinyStacksplit, smallStacksplit, bigStacksplit} {
+			prologue := make(instrseq, 0, len(getG)+len(stacksplit))
+			prologue = append(prologue, getG...)
+			prologue = append(prologue, stacksplit...)
+			prologues = append(prologues, prologue)
+		}
+	}
+}
+
+// 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 (dbp *Process) FirstPCAfterPrologue(fn *gosym.Func, sameline bool) (uint64, error) {
+	text, err := dbp.CurrentThread.Disassemble(fn.Entry, fn.End, false)
+	if err != nil {
+		return fn.Entry, err
+	}
+
+	if len(text) <= 0 {
+		return fn.Entry, nil
+	}
+
+	for _, prologue := range prologues {
+		if len(prologue) >= len(text) {
+			continue
+		}
+		if checkPrologue(text, prologue) {
+			r := &text[len(prologue)]
+			if sameline {
+				if r.Loc.Line != text[0].Loc.Line {
+					return fn.Entry, nil
+				}
+			}
+			return r.Loc.PC, nil
+		}
+	}
+
+	return fn.Entry, nil
+}
+
+func checkPrologue(s []AsmInstruction, prologuePattern instrseq) bool {
+	line := s[0].Loc.Line
+	for i, op := range prologuePattern {
+		if s[i].Inst.Op != op || s[i].Loc.Line != line {
+			return false
+		}
+	}
+	return true
+}