go nm 源码
golang nm 代码
文件路径：/src/cmd/nm/nm.go
// 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"
"flag"
"fmt"
"log"
"os"
"sort"
"cmd/internal/objfile"
)
const helpText = `usage: go tool nm [options] file...
-n
an alias for -sort address (numeric),
for compatibility with other nm commands
-size
print symbol size in decimal between address and type
-sort {address,name,none,size}
sort output in the given order (default name)
size orders from largest to smallest
-type
print symbol type after name
`
func usage() {
fmt.Fprintf(os.Stderr, helpText)
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 ...any) {
log.Printf(format, args...)
exitCode = 1
}
func nm(file string) {
f, err := objfile.Open(file)
if err != nil {
errorf("%v", err)
return
}
defer f.Close()
w := bufio.NewWriter(os.Stdout)
entries := f.Entries()
var found bool
for _, e := range entries {
syms, err := e.Symbols()
if err != nil {
errorf("reading %s: %v", file, err)
}
if len(syms) == 0 {
continue
}
found = true
switch *sortOrder {
case "address":
sort.Slice(syms, func(i, j int) bool { return syms[i].Addr < syms[j].Addr })
case "name":
sort.Slice(syms, func(i, j int) bool { return syms[i].Name < syms[j].Name })
case "size":
sort.Slice(syms, func(i, j int) bool { return syms[i].Size > syms[j].Size })
}
for _, sym := range syms {
if len(entries) > 1 {
name := e.Name()
if name == "" {
fmt.Fprintf(w, "%s(%s):\t", file, "_go_.o")
} else {
fmt.Fprintf(w, "%s(%s):\t", file, name)
}
} else 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")
}
}
if !found {
errorf("reading %s: no symbols", file)
}
w.Flush()
}
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