// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"bufio"
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"flag"
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"fmt"
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"log"
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"os"
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"sort"
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"cmd/internal/objfile"
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)
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const helpText = `usage: go tool nm [options] file...
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-n
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an alias for -sort address (numeric),
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for compatibility with other nm commands
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-size
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print symbol size in decimal between address and type
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-sort {address,name,none,size}
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sort output in the given order (default name)
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size orders from largest to smallest
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-type
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print symbol type after name
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`
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func usage() {
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fmt.Fprintf(os.Stderr, helpText)
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os.Exit(2)
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}
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var (
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sortOrder = flag.String("sort", "name", "")
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printSize = flag.Bool("size", false, "")
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printType = flag.Bool("type", false, "")
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filePrefix = false
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)
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func init() {
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flag.Var(nflag(0), "n", "") // alias for -sort address
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}
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type nflag int
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func (nflag) IsBoolFlag() bool {
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return true
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}
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func (nflag) Set(value string) error {
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if value == "true" {
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*sortOrder = "address"
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}
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return nil
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}
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func (nflag) String() string {
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if *sortOrder == "address" {
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return "true"
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}
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return "false"
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}
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func main() {
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log.SetFlags(0)
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flag.Usage = usage
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flag.Parse()
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switch *sortOrder {
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case "address", "name", "none", "size":
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// ok
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default:
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fmt.Fprintf(os.Stderr, "nm: unknown sort order %q\n", *sortOrder)
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os.Exit(2)
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}
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args := flag.Args()
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filePrefix = len(args) > 1
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if len(args) == 0 {
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flag.Usage()
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}
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for _, file := range args {
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nm(file)
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}
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os.Exit(exitCode)
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}
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var exitCode = 0
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func errorf(format string, args ...interface{}) {
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log.Printf(format, args...)
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exitCode = 1
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}
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func nm(file string) {
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f, err := objfile.Open(file)
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if err != nil {
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errorf("%v", err)
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return
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}
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defer f.Close()
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w := bufio.NewWriter(os.Stdout)
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entries := f.Entries()
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var found bool
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for _, e := range entries {
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syms, err := e.Symbols()
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if err != nil {
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errorf("reading %s: %v", file, err)
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}
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if len(syms) == 0 {
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continue
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}
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found = true
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switch *sortOrder {
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case "address":
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sort.Slice(syms, func(i, j int) bool { return syms[i].Addr < syms[j].Addr })
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case "name":
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sort.Slice(syms, func(i, j int) bool { return syms[i].Name < syms[j].Name })
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case "size":
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sort.Slice(syms, func(i, j int) bool { return syms[i].Size > syms[j].Size })
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}
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for _, sym := range syms {
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if len(entries) > 1 {
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name := e.Name()
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if name == "" {
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fmt.Fprintf(w, "%s(%s):\t", file, "_go_.o")
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} else {
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fmt.Fprintf(w, "%s(%s):\t", file, name)
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}
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} else if filePrefix {
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fmt.Fprintf(w, "%s:\t", file)
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}
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if sym.Code == 'U' {
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fmt.Fprintf(w, "%8s", "")
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} else {
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fmt.Fprintf(w, "%8x", sym.Addr)
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}
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if *printSize {
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fmt.Fprintf(w, " %10d", sym.Size)
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}
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fmt.Fprintf(w, " %c %s", sym.Code, sym.Name)
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if *printType && sym.Type != "" {
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fmt.Fprintf(w, " %s", sym.Type)
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}
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fmt.Fprintf(w, "\n")
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}
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}
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if !found {
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errorf("reading %s: no symbols", file)
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}
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w.Flush()
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}
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