144 lines
3.6 KiB
Go
144 lines
3.6 KiB
Go
// Copyright 2017 Google Inc. All Rights Reserved.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package profiler
|
|
|
|
import (
|
|
"bytes"
|
|
"regexp"
|
|
"runtime"
|
|
"strings"
|
|
|
|
"github.com/google/pprof/profile"
|
|
)
|
|
|
|
var shouldAssumeSymbolized = isSymbolizedGoVersion(runtime.Version())
|
|
|
|
type function interface {
|
|
Name() string
|
|
FileLine(pc uintptr) (string, int)
|
|
}
|
|
|
|
// funcForPC is a wrapper for runtime.FuncForPC. Defined as var for testing.
|
|
var funcForPC = func(pc uintptr) function {
|
|
if f := runtime.FuncForPC(pc); f != nil {
|
|
return f
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// parseAndSymbolize parses a profile from a buffer, symbolizes it
|
|
// if it's not yet symbolized, and writes the profile back as a
|
|
// gzip-compressed marshaled protobuf.
|
|
func parseAndSymbolize(data *bytes.Buffer) error {
|
|
p, err := profile.ParseData(data.Bytes())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Do nothing if the profile is already symbolized.
|
|
if symbolized(p) {
|
|
return nil
|
|
}
|
|
// Clear the profile functions to avoid creating duplicates.
|
|
p.Function = nil
|
|
symbolize(p)
|
|
data.Reset()
|
|
return p.Write(data)
|
|
}
|
|
|
|
// isSymbolizedGoVersion returns true if Go version equals to or is
|
|
// higher than Go 1.9. Starting Go 1.9 the profiles are symbolized
|
|
// by runtime/pprof.
|
|
func isSymbolizedGoVersion(goVersion string) bool {
|
|
r, err := regexp.Compile(`go(1\.9|1\.[1-9][0-9]|[2-9]).*`)
|
|
if err == nil && r.MatchString(goVersion) {
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
// symbolized checks if all locations have symbolized function
|
|
// information.
|
|
func symbolized(p *profile.Profile) bool {
|
|
for _, l := range p.Location {
|
|
if len(l.Line) == 0 || l.Line[0].Function == nil {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
func symbolize(p *profile.Profile) {
|
|
fns := profileFunctionMap{}
|
|
for _, l := range p.Location {
|
|
pc := uintptr(l.Address)
|
|
f := funcForPC(pc)
|
|
if f == nil {
|
|
continue
|
|
}
|
|
file, lineno := f.FileLine(pc)
|
|
l.Line = []profile.Line{
|
|
{
|
|
Function: fns.findOrAddFunction(f.Name(), file, p),
|
|
Line: int64(lineno),
|
|
},
|
|
}
|
|
}
|
|
// Trim runtime functions. Always hide runtime.goexit. Other runtime
|
|
// functions are only hidden for heap profile when they appear at the beginning.
|
|
isHeapProfile := p.PeriodType != nil && p.PeriodType.Type == "space"
|
|
for _, s := range p.Sample {
|
|
show := !isHeapProfile
|
|
var i int
|
|
for _, l := range s.Location {
|
|
if len(l.Line) > 0 && l.Line[0].Function != nil {
|
|
name := l.Line[0].Function.Name
|
|
if name == "runtime.goexit" || !show && strings.HasPrefix(name, "runtime.") {
|
|
continue
|
|
}
|
|
}
|
|
show = true
|
|
s.Location[i] = l
|
|
i++
|
|
}
|
|
// If all locations of a sample are trimmed, keep the root location.
|
|
if i == 0 && len(s.Location) > 0 {
|
|
s.Location[0] = s.Location[len(s.Location)-1]
|
|
i = 1
|
|
}
|
|
s.Location = s.Location[:i]
|
|
}
|
|
}
|
|
|
|
type profileFunctionMap map[profile.Function]*profile.Function
|
|
|
|
func (fns profileFunctionMap) findOrAddFunction(name, filename string, p *profile.Profile) *profile.Function {
|
|
f := profile.Function{
|
|
Name: name,
|
|
SystemName: name,
|
|
Filename: filename,
|
|
}
|
|
if fp := fns[f]; fp != nil {
|
|
return fp
|
|
}
|
|
fp := new(profile.Function)
|
|
fns[f] = fp
|
|
|
|
*fp = f
|
|
fp.ID = uint64(len(p.Function) + 1)
|
|
p.Function = append(p.Function, fp)
|
|
return fp
|
|
}
|