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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 symbolz symbolizes a profile using the output from the symbolz
// service.
package symbolz
import (
"bytes"
"fmt"
"io"
"net/url"
"regexp"
"strconv"
"strings"
"cmd/pprof/internal/profile"
)
var (
symbolzRE = regexp.MustCompile(`(0x[[:xdigit:]]+)\s+(.*)`)
)
// Symbolize symbolizes profile p by parsing data returned by a
// symbolz handler. syms receives the symbolz query (hex addresses
// separated by '+') and returns the symbolz output in a string. It
// symbolizes all locations based on their addresses, regardless of
// mapping.
func Symbolize(source string, syms func(string, string) ([]byte, error), p *profile.Profile) error {
if source = symbolz(source, p); source == "" {
// If the source is not a recognizable URL, do nothing.
return nil
}
// Construct query of addresses to symbolize.
var a []string
for _, l := range p.Location {
if l.Address != 0 && len(l.Line) == 0 {
a = append(a, fmt.Sprintf("%#x", l.Address))
}
}
if len(a) == 0 {
// No addresses to symbolize.
return nil
}
lines := make(map[uint64]profile.Line)
functions := make(map[string]*profile.Function)
if b, err := syms(source, strings.Join(a, "+")); err == nil {
buf := bytes.NewBuffer(b)
for {
l, err := buf.ReadString('\n')
if err != nil {
if err == io.EOF {
break
}
return err
}
if symbol := symbolzRE.FindStringSubmatch(l); len(symbol) == 3 {
addr, err := strconv.ParseUint(symbol[1], 0, 64)
if err != nil {
return fmt.Errorf("unexpected parse failure %s: %v", symbol[1], err)
}
name := symbol[2]
fn := functions[name]
if fn == nil {
fn = &profile.Function{
ID: uint64(len(p.Function) + 1),
Name: name,
SystemName: name,
}
functions[name] = fn
p.Function = append(p.Function, fn)
}
lines[addr] = profile.Line{Function: fn}
}
}
}
for _, l := range p.Location {
if line, ok := lines[l.Address]; ok {
l.Line = []profile.Line{line}
if l.Mapping != nil {
l.Mapping.HasFunctions = true
}
}
}
return nil
}
// symbolz returns the corresponding symbolz source for a profile URL.
func symbolz(source string, p *profile.Profile) string {
if url, err := url.Parse(source); err == nil && url.Host != "" {
if last := strings.LastIndex(url.Path, "/"); last != -1 {
if strings.HasSuffix(url.Path[:last], "pprof") {
url.Path = url.Path[:last] + "/symbol"
} else {
url.Path = url.Path[:last] + "/symbolz"
}
return url.String()
}
}
return ""
}
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