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pkg/proc: Untangle Arch from G struct

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More untangling. Arch doesn't actually need to know anything about a
Goroutine.
This commit is contained in:
Derek Parker
2019-08-07 20:44:37 -07:00
committed by Alessandro Arzilli
parent 2de4930ad1
commit 583d335ffe
3 changed files with 78 additions and 66 deletions
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108
pkg/proc/variables.go
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@ -213,6 +213,60 @@ type G struct {
Unreadable error // could not read the G struct
}
// Defer returns the top-most defer of the goroutine.
func (g *G) Defer() *Defer {
if g.variable.Unreadable != nil {
return nil
}
dvar := g.variable.fieldVariable("_defer").maybeDereference()
if dvar.Addr == 0 {
return nil
}
d := &Defer{variable: dvar}
d.load()
return d
}
// UserCurrent returns the location the users code is at,
// or was at before entering a runtime function.
func (g *G) UserCurrent() Location {
it, err := g.stackIterator()
if err != nil {
return g.CurrentLoc
}
for it.Next() {
frame := it.Frame()
if frame.Call.Fn != nil {
name := frame.Call.Fn.Name
if strings.Contains(name, ".") && (!strings.HasPrefix(name, "runtime.") || isExportedRuntime(name)) {
return frame.Call
}
}
}
return g.CurrentLoc
}
// Go returns the location of the 'go' statement
// that spawned this goroutine.
func (g *G) Go() Location {
pc := g.GoPC
if fn := g.variable.bi.PCToFunc(pc); fn != nil {
// Backup to CALL instruction.
// Mimics runtime/traceback.go:677.
if g.GoPC > fn.Entry {
pc--
}
}
f, l, fn := g.variable.bi.PCToLine(pc)
return Location{PC: g.GoPC, File: f, Line: l, Fn: fn}
}
// StartLoc returns the starting location of the goroutine.
func (g *G) StartLoc() Location {
f, l, fn := g.variable.bi.PCToLine(g.StartPC)
return Location{PC: g.StartPC, File: f, Line: l, Fn: fn}
}
type Ancestor struct {
ID int64 // Goroutine ID
Unreadable error
@ -601,20 +655,6 @@ func (v *Variable) fieldVariable(name string) *Variable {
return nil
}
// Defer returns the top-most defer of the goroutine.
func (g *G) Defer() *Defer {
if g.variable.Unreadable != nil {
return nil
}
dvar := g.variable.fieldVariable("_defer").maybeDereference()
if dvar.Addr == 0 {
return nil
}
d := &Defer{variable: dvar}
d.load()
return d
}
// From $GOROOT/src/runtime/traceback.go:597
// isExportedRuntime reports whether name is an exported runtime function.
// It is only for runtime functions, so ASCII A-Z is fine.
@ -623,46 +663,6 @@ func isExportedRuntime(name string) bool {
return len(name) > n && name[:n] == "runtime." && 'A' <= name[n] && name[n] <= 'Z'
}
// UserCurrent returns the location the users code is at,
// or was at before entering a runtime function.
func (g *G) UserCurrent() Location {
it, err := g.stackIterator()
if err != nil {
return g.CurrentLoc
}
for it.Next() {
frame := it.Frame()
if frame.Call.Fn != nil {
name := frame.Call.Fn.Name
if strings.Contains(name, ".") && (!strings.HasPrefix(name, "runtime.") || isExportedRuntime(name)) {
return frame.Call
}
}
}
return g.CurrentLoc
}
// Go returns the location of the 'go' statement
// that spawned this goroutine.
func (g *G) Go() Location {
pc := g.GoPC
if fn := g.variable.bi.PCToFunc(pc); fn != nil {
// Backup to CALL instruction.
// Mimics runtime/traceback.go:677.
if g.GoPC > fn.Entry {
pc--
}
}
f, l, fn := g.variable.bi.PCToLine(pc)
return Location{PC: g.GoPC, File: f, Line: l, Fn: fn}
}
// StartLoc returns the starting location of the goroutine.
func (g *G) StartLoc() Location {
f, l, fn := g.variable.bi.PCToLine(g.StartPC)
return Location{PC: g.StartPC, File: f, Line: l, Fn: fn}
}
var errTracebackAncestorsDisabled = errors.New("tracebackancestors is disabled")
// Ancestors returns the list of ancestors for g.