mirror of
https://github.com/beego/bee.git
synced 2024-11-25 09:50:55 +00:00
412 lines
9.8 KiB
Go
412 lines
9.8 KiB
Go
package debugger
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import (
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"debug/gosym"
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"fmt"
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"go/constant"
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"path/filepath"
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"reflect"
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"runtime"
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"strconv"
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"strings"
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"github.com/derekparker/delve/proc"
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"github.com/derekparker/delve/service/api"
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)
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const maxFindLocationCandidates = 5
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type LocationSpec interface {
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Find(d *Debugger, scope *proc.EvalScope, locStr string) ([]api.Location, error)
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}
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type NormalLocationSpec struct {
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Base string
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FuncBase *FuncLocationSpec
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LineOffset int
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}
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type RegexLocationSpec struct {
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FuncRegex string
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}
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type AddrLocationSpec struct {
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AddrExpr string
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}
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type OffsetLocationSpec struct {
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Offset int
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}
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type LineLocationSpec struct {
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Line int
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}
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type FuncLocationSpec struct {
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PackageName string
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AbsolutePackage bool
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ReceiverName string
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PackageOrReceiverName string
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BaseName string
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}
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func parseLocationSpec(locStr string) (LocationSpec, error) {
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rest := locStr
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malformed := func(reason string) error {
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return fmt.Errorf("Malformed breakpoint location \"%s\" at %d: %s", locStr, len(locStr)-len(rest), reason)
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}
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if len(rest) <= 0 {
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return nil, malformed("empty string")
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}
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switch rest[0] {
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case '+', '-':
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offset, err := strconv.Atoi(rest)
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if err != nil {
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return nil, malformed(err.Error())
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}
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return &OffsetLocationSpec{offset}, nil
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case '/':
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if rest[len(rest)-1] == '/' {
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rx, rest := readRegex(rest[1:])
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if len(rest) < 0 {
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return nil, malformed("non-terminated regular expression")
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}
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if len(rest) > 1 {
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return nil, malformed("no line offset can be specified for regular expression locations")
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}
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return &RegexLocationSpec{rx}, nil
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} else {
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return parseLocationSpecDefault(locStr, rest)
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}
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case '*':
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return &AddrLocationSpec{rest[1:]}, nil
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default:
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return parseLocationSpecDefault(locStr, rest)
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}
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}
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func parseLocationSpecDefault(locStr, rest string) (LocationSpec, error) {
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malformed := func(reason string) error {
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return fmt.Errorf("Malformed breakpoint location \"%s\" at %d: %s", locStr, len(locStr)-len(rest), reason)
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}
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v := strings.Split(rest, ":")
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if len(v) > 2 {
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// On Windows, path may contain ":", so split only on last ":"
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v = []string{strings.Join(v[0:len(v)-1], ":"), v[len(v)-1]}
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}
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if len(v) == 1 {
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n, err := strconv.ParseInt(v[0], 0, 64)
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if err == nil {
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return &LineLocationSpec{int(n)}, nil
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}
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}
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spec := &NormalLocationSpec{}
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spec.Base = v[0]
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spec.FuncBase = parseFuncLocationSpec(spec.Base)
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if len(v) < 2 {
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spec.LineOffset = -1
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return spec, nil
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}
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rest = v[1]
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var err error
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spec.LineOffset, err = strconv.Atoi(rest)
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if err != nil || spec.LineOffset < 0 {
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return nil, malformed("line offset negative or not a number")
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}
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return spec, nil
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}
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func readRegex(in string) (rx string, rest string) {
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out := make([]rune, 0, len(in))
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escaped := false
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for i, ch := range in {
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if escaped {
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if ch == '/' {
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out = append(out, '/')
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} else {
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out = append(out, '\\')
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out = append(out, ch)
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}
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escaped = false
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} else {
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switch ch {
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case '\\':
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escaped = true
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case '/':
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return string(out), in[i:]
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default:
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out = append(out, ch)
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}
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}
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}
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return string(out), ""
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}
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func parseFuncLocationSpec(in string) *FuncLocationSpec {
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var v []string
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pathend := strings.LastIndex(in, "/")
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if pathend < 0 {
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v = strings.Split(in, ".")
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} else {
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v = strings.Split(in[pathend:], ".")
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if len(v) > 0 {
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v[0] = in[:pathend] + v[0]
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}
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}
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var spec FuncLocationSpec
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switch len(v) {
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case 1:
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spec.BaseName = v[0]
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case 2:
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spec.BaseName = v[1]
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r := stripReceiverDecoration(v[0])
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if r != v[0] {
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spec.ReceiverName = r
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} else if strings.Index(r, "/") >= 0 {
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spec.PackageName = r
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} else {
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spec.PackageOrReceiverName = r
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}
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case 3:
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spec.BaseName = v[2]
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spec.ReceiverName = stripReceiverDecoration(v[1])
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spec.PackageName = v[0]
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default:
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return nil
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}
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if strings.HasPrefix(spec.PackageName, "/") {
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spec.PackageName = spec.PackageName[1:]
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spec.AbsolutePackage = true
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}
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if strings.Index(spec.BaseName, "/") >= 0 || strings.Index(spec.ReceiverName, "/") >= 0 {
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return nil
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}
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return &spec
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}
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func stripReceiverDecoration(in string) string {
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if len(in) < 3 {
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return in
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}
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if (in[0] != '(') || (in[1] != '*') || (in[len(in)-1] != ')') {
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return in
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}
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return in[2 : len(in)-1]
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}
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func (spec *FuncLocationSpec) Match(sym *gosym.Sym) bool {
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if spec.BaseName != sym.BaseName() {
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return false
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}
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recv := stripReceiverDecoration(sym.ReceiverName())
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if spec.ReceiverName != "" && spec.ReceiverName != recv {
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return false
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}
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if spec.PackageName != "" {
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if spec.AbsolutePackage {
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if spec.PackageName != sym.PackageName() {
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return false
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}
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} else {
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if !partialPathMatch(spec.PackageName, sym.PackageName()) {
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return false
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}
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}
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}
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if spec.PackageOrReceiverName != "" && !partialPathMatch(spec.PackageOrReceiverName, sym.PackageName()) && spec.PackageOrReceiverName != recv {
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return false
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}
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return true
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}
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func (loc *RegexLocationSpec) Find(d *Debugger, scope *proc.EvalScope, locStr string) ([]api.Location, error) {
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funcs := d.process.Funcs()
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matches, err := regexFilterFuncs(loc.FuncRegex, funcs)
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if err != nil {
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return nil, err
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}
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r := make([]api.Location, 0, len(matches))
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for i := range matches {
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addr, err := d.process.FindFunctionLocation(matches[i], true, 0)
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if err == nil {
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r = append(r, api.Location{PC: addr})
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}
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}
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return r, nil
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}
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func (loc *AddrLocationSpec) Find(d *Debugger, scope *proc.EvalScope, locStr string) ([]api.Location, error) {
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if scope == nil {
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addr, err := strconv.ParseInt(loc.AddrExpr, 0, 64)
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if err != nil {
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return nil, fmt.Errorf("could not determine current location (scope is nil)")
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}
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return []api.Location{{PC: uint64(addr)}}, nil
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} else {
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v, err := scope.EvalExpression(loc.AddrExpr, proc.LoadConfig{true, 0, 0, 0, 0})
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if err != nil {
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return nil, err
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}
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if v.Unreadable != nil {
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return nil, v.Unreadable
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}
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switch v.Kind {
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
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addr, _ := constant.Uint64Val(v.Value)
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return []api.Location{{PC: addr}}, nil
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case reflect.Func:
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_, _, fn := d.process.PCToLine(uint64(v.Base))
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pc, err := d.process.FirstPCAfterPrologue(fn, false)
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if err != nil {
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return nil, err
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}
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return []api.Location{{PC: uint64(pc)}}, nil
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default:
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return nil, fmt.Errorf("wrong expression kind: %v", v.Kind)
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}
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}
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}
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func (loc *NormalLocationSpec) FileMatch(path string) bool {
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return partialPathMatch(loc.Base, path)
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}
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func partialPathMatch(expr, path string) bool {
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if runtime.GOOS == "windows" {
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// Accept `expr` which is case-insensitive and slash-insensitive match to `path`
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expr = strings.ToLower(filepath.ToSlash(expr))
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path = strings.ToLower(filepath.ToSlash(path))
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}
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if len(expr) < len(path)-1 {
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return strings.HasSuffix(path, expr) && (path[len(path)-len(expr)-1] == '/')
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} else {
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return expr == path
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}
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}
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type AmbiguousLocationError struct {
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Location string
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CandidatesString []string
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CandidatesLocation []api.Location
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}
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func (ale AmbiguousLocationError) Error() string {
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var candidates []string
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if ale.CandidatesLocation != nil {
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for i := range ale.CandidatesLocation {
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candidates = append(candidates, ale.CandidatesLocation[i].Function.Name)
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}
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} else {
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candidates = ale.CandidatesString
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}
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return fmt.Sprintf("Location \"%s\" ambiguous: %s…", ale.Location, strings.Join(candidates, ", "))
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}
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func (loc *NormalLocationSpec) Find(d *Debugger, scope *proc.EvalScope, locStr string) ([]api.Location, error) {
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funcs := d.process.Funcs()
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files := d.process.Sources()
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candidates := []string{}
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for file := range files {
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if loc.FileMatch(file) {
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candidates = append(candidates, file)
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if len(candidates) >= maxFindLocationCandidates {
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break
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}
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}
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}
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if loc.FuncBase != nil {
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for _, f := range funcs {
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if f.Sym == nil {
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continue
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}
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if loc.FuncBase.Match(f.Sym) {
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if loc.Base == f.Name {
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// if an exact match for the function name is found use it
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candidates = []string{f.Name}
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break
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}
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if len(candidates) < maxFindLocationCandidates {
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candidates = append(candidates, f.Name)
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}
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}
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}
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}
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switch len(candidates) {
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case 1:
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var addr uint64
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var err error
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if filepath.IsAbs(candidates[0]) {
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if loc.LineOffset < 0 {
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return nil, fmt.Errorf("Malformed breakpoint location, no line offset specified")
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}
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addr, err = d.process.FindFileLocation(candidates[0], loc.LineOffset)
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} else {
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if loc.LineOffset < 0 {
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addr, err = d.process.FindFunctionLocation(candidates[0], true, 0)
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} else {
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addr, err = d.process.FindFunctionLocation(candidates[0], false, loc.LineOffset)
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}
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}
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if err != nil {
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return nil, err
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}
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return []api.Location{{PC: addr}}, nil
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case 0:
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return nil, fmt.Errorf("Location \"%s\" not found", locStr)
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default:
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return nil, AmbiguousLocationError{Location: locStr, CandidatesString: candidates}
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}
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}
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func (loc *OffsetLocationSpec) Find(d *Debugger, scope *proc.EvalScope, locStr string) ([]api.Location, error) {
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if scope == nil {
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return nil, fmt.Errorf("could not determine current location (scope is nil)")
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}
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file, line, fn := d.process.PCToLine(scope.PC)
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if fn == nil {
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return nil, fmt.Errorf("could not determine current location")
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}
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addr, err := d.process.FindFileLocation(file, line+loc.Offset)
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return []api.Location{{PC: addr}}, err
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}
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func (loc *LineLocationSpec) Find(d *Debugger, scope *proc.EvalScope, locStr string) ([]api.Location, error) {
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if scope == nil {
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return nil, fmt.Errorf("could not determine current location (scope is nil)")
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}
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file, _, fn := d.process.PCToLine(scope.PC)
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if fn == nil {
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return nil, fmt.Errorf("could not determine current location")
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}
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addr, err := d.process.FindFileLocation(file, loc.Line)
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return []api.Location{{PC: addr}}, err
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}
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