1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
|
// 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"
"sync"
"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 {
mu sync.Mutex
disasmCache map[string]*objfile.Disasm
}
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 (t *objTool) Disasm(file string, start, end uint64) ([]plugin.Inst, error) {
d, err := t.cachedDisasm(file)
if err != nil {
return nil, err
}
var asm []plugin.Inst
d.Decode(start, end, func(pc, size uint64, file string, line int, text string) {
asm = append(asm, plugin.Inst{Addr: pc, File: file, Line: line, Text: text})
})
return asm, nil
}
func (t *objTool) cachedDisasm(file string) (*objfile.Disasm, error) {
t.mu.Lock()
defer t.mu.Unlock()
if t.disasmCache == nil {
t.disasmCache = make(map[string]*objfile.Disasm)
}
d := t.disasmCache[file]
if d != nil {
return d, nil
}
f, err := objfile.Open(file)
if err != nil {
return nil, err
}
d, err = f.Disasm()
f.Close()
if err != nil {
return nil, err
}
t.disasmCache[file] = d
return d, nil
}
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
}
|
