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Improve variable evaluation scope

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Properly scope variable evaluation to the function the traced process is
currently stopped in.
This commit is contained in:
Derek Parker
2014-11-10 21:26:13 -06:00
parent af0e0286a6
commit dcf9f04d45
3 changed files with 60 additions and 17 deletions
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67
proctl/variables_linux_amd64.go
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@ -24,20 +24,21 @@ func (dbp *DebuggedProcess) PrintGoroutinesInfo() error {
if err != nil {
return err
}
reader := data.Reader()
allglen, err := allglenval(dbp, data)
allglen, err := allglenval(dbp, reader)
if err != nil {
return err
}
goidoffset, err := parsegoidoffset(dbp, data)
goidoffset, err := parsegoidoffset(dbp, reader)
if err != nil {
return err
}
schedoffset, err := parseschedoffset(dbp, data)
schedoffset, err := parseschedoffset(dbp, reader)
if err != nil {
return err
}
allgentryaddr, err := allgentryptr(dbp, data)
allgentryaddr, err := allgentryptr(dbp, reader)
if err != nil {
return err
}
@ -76,8 +77,8 @@ func printGoroutineInfo(dbp *DebuggedProcess, addr uint64, goidoffset, schedoffs
return nil
}
func allglenval(dbp *DebuggedProcess, data *dwarf.Data) (uint64, error) {
entry, err := findDwarfEntry("runtime.allglen", data)
func allglenval(dbp *DebuggedProcess, reader *dwarf.Reader) (uint64, error) {
entry, err := findDwarfEntry("runtime.allglen", reader)
if err != nil {
return 0, err
}
@ -97,8 +98,8 @@ func allglenval(dbp *DebuggedProcess, data *dwarf.Data) (uint64, error) {
return binary.LittleEndian.Uint64(val), nil
}
func allgentryptr(dbp *DebuggedProcess, data *dwarf.Data) (uint64, error) {
entry, err := findDwarfEntry("runtime.allg", data)
func allgentryptr(dbp *DebuggedProcess, reader *dwarf.Reader) (uint64, error) {
entry, err := findDwarfEntry("runtime.allg", reader)
if err != nil {
return 0, err
}
@ -115,8 +116,8 @@ func allgentryptr(dbp *DebuggedProcess, data *dwarf.Data) (uint64, error) {
return uint64(addr), nil
}
func parsegoidoffset(dbp *DebuggedProcess, data *dwarf.Data) (uint64, error) {
entry, err := findDwarfEntry("goid", data)
func parsegoidoffset(dbp *DebuggedProcess, reader *dwarf.Reader) (uint64, error) {
entry, err := findDwarfEntry("goid", reader)
if err != nil {
return 0, err
}
@ -132,8 +133,8 @@ func parsegoidoffset(dbp *DebuggedProcess, data *dwarf.Data) (uint64, error) {
return uint64(offset), nil
}
func parseschedoffset(dbp *DebuggedProcess, data *dwarf.Data) (uint64, error) {
entry, err := findDwarfEntry("sched", data)
func parseschedoffset(dbp *DebuggedProcess, reader *dwarf.Reader) (uint64, error) {
entry, err := findDwarfEntry("sched", reader)
if err != nil {
return 0, err
}
@ -156,7 +157,18 @@ func (thread *ThreadContext) EvalSymbol(name string) (*Variable, error) {
return nil, err
}
entry, err := findDwarfEntry(name, data)
pc, err := thread.CurrentPC()
if err != nil {
return nil, err
}
fn := thread.Process.GoSymTable.PCToFunc(pc)
if fn == nil {
return nil, fmt.Errorf("could not func function scope")
}
reader := data.Reader()
err = findFunction(fn.Name, reader)
entry, err := findDwarfEntry(name, reader)
if err != nil {
return nil, err
}
@ -184,9 +196,34 @@ func (thread *ThreadContext) EvalSymbol(name string) (*Variable, error) {
return &Variable{Name: name, Type: t.String(), Value: val}, nil
}
func findDwarfEntry(name string, data *dwarf.Data) (*dwarf.Entry, error) {
reader := data.Reader()
// findFunction is basically used to seek the dwarf.Reader to
// the function entry that represents our current scope. From there
// we can find the first child entry that matches the var name and
// use it to determine the value of the variable.
func findFunction(name string, reader *dwarf.Reader) error {
for entry, err := reader.Next(); entry != nil; entry, err = reader.Next() {
if err != nil {
return err
}
if entry.Tag != dwarf.TagSubprogram {
continue
}
n, ok := entry.Val(dwarf.AttrName).(string)
if !ok {
continue
}
if n == name {
break
}
}
return nil
}
func findDwarfEntry(name string, reader *dwarf.Reader) (*dwarf.Entry, error) {
for entry, err := reader.Next(); entry != nil; entry, err = reader.Next() {
if err != nil {
return nil, err