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// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"debug/gosym"
"flag"
"fmt"
"os"
"regexp"
"strings"
"cmd/internal/objfile"
"cmd/pprof/internal/commands"
"cmd/pprof/internal/driver"
"cmd/pprof/internal/fetch"
"cmd/pprof/internal/plugin"
"cmd/pprof/internal/profile"
"cmd/pprof/internal/symbolizer"
"cmd/pprof/internal/symbolz"
)
func main() {
var extraCommands map[string]*commands.Command // no added Go-specific commands
if err := driver.PProf(flags{}, fetch.Fetcher, symbolize, new(objTool), plugin.StandardUI(), extraCommands); err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
}
}
// symbolize attempts to symbolize profile p.
// If the source is a local binary, it tries using symbolizer and obj.
// If the source is a URL, it fetches symbol information using symbolz.
func symbolize(mode, source string, p *profile.Profile, obj plugin.ObjTool, ui plugin.UI) error {
remote, local := true, true
for _, o := range strings.Split(strings.ToLower(mode), ":") {
switch o {
case "none", "no":
return nil
case "local":
remote, local = false, true
case "remote":
remote, local = true, false
default:
ui.PrintErr("ignoring unrecognized symbolization option: " + mode)
ui.PrintErr("expecting -symbolize=[local|remote|none][:force]")
fallthrough
case "", "force":
// Ignore these options, -force is recognized by symbolizer.Symbolize
}
}
var err error
if local {
// Symbolize using binutils.
if err = symbolizer.Symbolize(mode, p, obj, ui); err == nil {
return nil
}
}
if remote {
err = symbolz.Symbolize(source, fetch.PostURL, p)
}
return err
}
// flags implements the driver.FlagPackage interface using the builtin flag package.
type flags struct {
}
func (flags) Bool(o string, d bool, c string) *bool {
return flag.Bool(o, d, c)
}
func (flags) Int(o string, d int, c string) *int {
return flag.Int(o, d, c)
}
func (flags) Float64(o string, d float64, c string) *float64 {
return flag.Float64(o, d, c)
}
func (flags) String(o, d, c string) *string {
return flag.String(o, d, c)
}
func (flags) Parse(usage func()) []string {
flag.Usage = usage
flag.Parse()
args := flag.Args()
if len(args) == 0 {
usage()
}
return args
}
func (flags) ExtraUsage() string {
return ""
}
// objTool implements plugin.ObjTool using Go libraries
// (instead of invoking GNU binutils).
type objTool struct{}
func (*objTool) Open(name string, start uint64) (plugin.ObjFile, error) {
of, err := objfile.Open(name)
if err != nil {
return nil, err
}
f := &file{
name: name,
file: of,
}
return f, nil
}
func (*objTool) Demangle(names []string) (map[string]string, error) {
// No C++, nothing to demangle.
return make(map[string]string), nil
}
func (*objTool) Disasm(file string, start, end uint64) ([]plugin.Inst, error) {
return nil, fmt.Errorf("disassembly not supported")
}
func (*objTool) SetConfig(config string) {
// config is usually used to say what binaries to invoke.
// Ignore entirely.
}
// file implements plugin.ObjFile using Go libraries
// (instead of invoking GNU binutils).
// A file represents a single executable being analyzed.
type file struct {
name string
sym []objfile.Sym
file *objfile.File
pcln *gosym.Table
}
func (f *file) Name() string {
return f.name
}
func (f *file) Base() uint64 {
// No support for shared libraries.
return 0
}
func (f *file) BuildID() string {
// No support for build ID.
return ""
}
func (f *file) SourceLine(addr uint64) ([]plugin.Frame, error) {
if f.pcln == nil {
pcln, err := f.file.PCLineTable()
if err != nil {
return nil, err
}
f.pcln = pcln
}
file, line, fn := f.pcln.PCToLine(addr)
if fn == nil {
return nil, fmt.Errorf("no line information for PC=%#x", addr)
}
frame := []plugin.Frame{
{
Func: fn.Name,
File: file,
Line: line,
},
}
return frame, nil
}
func (f *file) Symbols(r *regexp.Regexp, addr uint64) ([]*plugin.Sym, error) {
if f.sym == nil {
sym, err := f.file.Symbols()
if err != nil {
return nil, err
}
f.sym = sym
}
var out []*plugin.Sym
for _, s := range f.sym {
if (r == nil || r.MatchString(s.Name)) && (addr == 0 || s.Addr <= addr && addr < s.Addr+uint64(s.Size)) {
out = append(out, &plugin.Sym{
Name: []string{s.Name},
File: f.name,
Start: s.Addr,
End: s.Addr + uint64(s.Size) - 1,
})
}
}
return out, nil
}
func (f *file) Close() error {
f.file.Close()
return nil
}
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