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cmd/pprof/internal/profile: always subtract 1 from PCs

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Go runtime never emits PCs that are not a return address
(except for cpu profiler).

Change-Id: I08d9dc5c7c71e23f34f2f0c16f8baeeb4f64fcd6
Reviewed-on: https://go-review.googlesource.com/21735
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Dmitry Vyukov 2016-04-08 17:56:36 +02:00
parent eb79f21c48
commit da6205b67e
1 changed files with 13 additions and 28 deletions
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41
src/cmd/internal/pprof/profile/legacy_profile.go
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@ -110,11 +110,8 @@ func parseGoCount(b []byte) (*Profile, error) {
if err != nil {
return nil, errMalformed
}
// Adjust all frames by -1 (except the leaf) to land on top of
// the call instruction.
if len(locs) > 0 {
addr--
}
// Adjust all frames by -1 to land on the call instruction.
addr--
loc := locations[addr]
if loc == nil {
loc = &Location{
@ -291,11 +288,8 @@ func ParseTracebacks(b []byte) (*Profile, error) {
if s, addrs := extractHexAddresses(l); len(s) > 0 {
for _, addr := range addrs {
// Addresses from stack traces point to the next instruction after
// each call. Adjust by -1 to land somewhere on the actual call
// (except for the leaf, which is not a call).
if len(sloc) > 0 {
addr--
}
// each call. Adjust by -1 to land somewhere on the actual call.
addr--
loc := locs[addr]
if locs[addr] == nil {
loc = &Location{
@ -568,13 +562,10 @@ func parseHeap(b []byte) (p *Profile, err error) {
return nil, err
}
var sloc []*Location
for i, addr := range addrs {
for _, addr := range addrs {
// Addresses from stack traces point to the next instruction after
// each call. Adjust by -1 to land somewhere on the actual call
// (except for the leaf, which is not a call).
if i > 0 {
addr--
}
// each call. Adjust by -1 to land somewhere on the actual call.
addr--
loc := locs[addr]
if locs[addr] == nil {
loc = &Location{
@ -776,13 +767,10 @@ func parseContention(b []byte) (p *Profile, err error) {
return nil, err
}
var sloc []*Location
for i, addr := range addrs {
for _, addr := range addrs {
// Addresses from stack traces point to the next instruction after
// each call. Adjust by -1 to land somewhere on the actual call
// (except for the leaf, which is not a call).
if i > 0 {
addr--
}
// each call. Adjust by -1 to land somewhere on the actual call.
addr--
loc := locs[addr]
if locs[addr] == nil {
loc = &Location{
@ -919,13 +907,10 @@ func parseThread(b []byte) (*Profile, error) {
}
var sloc []*Location
for i, addr := range addrs {
for _, addr := range addrs {
// Addresses from stack traces point to the next instruction after
// each call. Adjust by -1 to land somewhere on the actual call
// (except for the leaf, which is not a call).
if i > 0 {
addr--
}
// each call. Adjust by -1 to land somewhere on the actual call.
addr--
loc := locs[addr]
if locs[addr] == nil {
loc = &Location{