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// Copyright 2013 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 (
"bufio"
"bytes"
"flag"
"fmt"
"io"
"log"
"os"
"sort"
)
func usage() {
fmt.Fprintf(os.Stderr, "usage: go tool nm [-n] [-size] [-sort order] [-type] file...\n")
os.Exit(2)
}
var (
sortOrder = flag.String("sort", "name", "")
printSize = flag.Bool("size", false, "")
printType = flag.Bool("type", false, "")
filePrefix = false
)
func init() {
flag.Var(nflag(0), "n", "") // alias for -sort address
}
type nflag int
func (nflag) IsBoolFlag() bool {
return true
}
func (nflag) Set(value string) error {
if value == "true" {
*sortOrder = "address"
}
return nil
}
func (nflag) String() string {
if *sortOrder == "address" {
return "true"
}
return "false"
}
func main() {
log.SetFlags(0)
flag.Usage = usage
flag.Parse()
switch *sortOrder {
case "address", "name", "none", "size":
// ok
default:
fmt.Fprintf(os.Stderr, "nm: unknown sort order %q\n", *sortOrder)
os.Exit(2)
}
args := flag.Args()
filePrefix = len(args) > 1
if len(args) == 0 {
flag.Usage()
}
for _, file := range args {
nm(file)
}
os.Exit(exitCode)
}
var exitCode = 0
func errorf(format string, args ...interface{}) {
log.Printf(format, args...)
exitCode = 1
}
type Sym struct {
Addr uint64
Size int64
Code rune
Name string
Type string
}
var parsers = []struct {
prefix []byte
parse func(*os.File) []Sym
}{
{[]byte("!<arch>\n"), goobjSymbols},
{[]byte("go object "), goobjSymbols},
{[]byte("\x7FELF"), elfSymbols},
{[]byte("\xFE\xED\xFA\xCE"), machoSymbols},
{[]byte("\xFE\xED\xFA\xCF"), machoSymbols},
{[]byte("\xCE\xFA\xED\xFE"), machoSymbols},
{[]byte("\xCF\xFA\xED\xFE"), machoSymbols},
{[]byte("MZ"), peSymbols},
{[]byte("\x00\x00\x01\xEB"), plan9Symbols}, // 386
{[]byte("\x00\x00\x04\x07"), plan9Symbols}, // mips
{[]byte("\x00\x00\x06\x47"), plan9Symbols}, // arm
{[]byte("\x00\x00\x8A\x97"), plan9Symbols}, // amd64
}
func nm(file string) {
f, err := os.Open(file)
if err != nil {
errorf("%v", err)
return
}
defer f.Close()
buf := make([]byte, 16)
io.ReadFull(f, buf)
f.Seek(0, 0)
var syms []Sym
for _, p := range parsers {
if bytes.HasPrefix(buf, p.prefix) {
syms = p.parse(f)
goto HaveSyms
}
}
errorf("%v: unknown file format", file)
return
HaveSyms:
switch *sortOrder {
case "address":
sort.Sort(byAddr(syms))
case "name":
sort.Sort(byName(syms))
case "size":
sort.Sort(bySize(syms))
}
w := bufio.NewWriter(os.Stdout)
for _, sym := range syms {
if filePrefix {
fmt.Fprintf(w, "%s:\t", file)
}
if sym.Code == 'U' {
fmt.Fprintf(w, "%8s", "")
} else {
fmt.Fprintf(w, "%8x", sym.Addr)
}
if *printSize {
fmt.Fprintf(w, " %10d", sym.Size)
}
fmt.Fprintf(w, " %c %s", sym.Code, sym.Name)
if *printType && sym.Type != "" {
fmt.Fprintf(w, " %s", sym.Type)
}
fmt.Fprintf(w, "\n")
}
w.Flush()
}
type byAddr []Sym
func (x byAddr) Len() int { return len(x) }
func (x byAddr) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
func (x byAddr) Less(i, j int) bool { return x[i].Addr < x[j].Addr }
type byName []Sym
func (x byName) Len() int { return len(x) }
func (x byName) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
func (x byName) Less(i, j int) bool { return x[i].Name < x[j].Name }
type bySize []Sym
func (x bySize) Len() int { return len(x) }
func (x bySize) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
func (x bySize) Less(i, j int) bool { return x[i].Size > x[j].Size }
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