go main 源码
golang main 代码
文件路径：/src/cmd/objdump/main.go
// Copyright 2012 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.
// Objdump disassembles executable files.
//
// Usage:
//
// go tool objdump [-s symregexp] binary
//
// Objdump prints a disassembly of all text symbols (code) in the binary.
// If the -s option is present, objdump only disassembles
// symbols with names matching the regular expression.
//
// Alternate usage:
//
// go tool objdump binary start end
//
// In this mode, objdump disassembles the binary starting at the start address and
// stopping at the end address. The start and end addresses are program
// counters written in hexadecimal with optional leading 0x prefix.
// In this mode, objdump prints a sequence of stanzas of the form:
//
// file:line
// address: assembly
// address: assembly
// ...
//
// Each stanza gives the disassembly for a contiguous range of addresses
// all mapped to the same original source file and line number.
// This mode is intended for use by pprof.
package main
import (
"flag"
"fmt"
"log"
"os"
"regexp"
"strconv"
"strings"
"cmd/internal/objfile"
)
var printCode = flag.Bool("S", false, "print Go code alongside assembly")
var symregexp = flag.String("s", "", "only dump symbols matching this regexp")
var gnuAsm = flag.Bool("gnu", false, "print GNU assembly next to Go assembly (where supported)")
var symRE *regexp.Regexp
func usage() {
fmt.Fprintf(os.Stderr, "usage: go tool objdump [-S] [-gnu] [-s symregexp] binary [start end]\n\n")
flag.PrintDefaults()
os.Exit(2)
}
func main() {
log.SetFlags(0)
log.SetPrefix("objdump: ")
flag.Usage = usage
flag.Parse()
if flag.NArg() != 1 && flag.NArg() != 3 {
usage()
}
if *symregexp != "" {
re, err := regexp.Compile(*symregexp)
if err != nil {
log.Fatalf("invalid -s regexp: %v", err)
}
symRE = re
}
f, err := objfile.Open(flag.Arg(0))
if err != nil {
log.Fatal(err)
}
defer f.Close()
dis, err := f.Disasm()
if err != nil {
log.Fatalf("disassemble %s: %v", flag.Arg(0), err)
}
switch flag.NArg() {
default:
usage()
case 1:
// disassembly of entire object
dis.Print(os.Stdout, symRE, 0, ^uint64(0), *printCode, *gnuAsm)
case 3:
// disassembly of PC range
start, err := strconv.ParseUint(strings.TrimPrefix(flag.Arg(1), "0x"), 16, 64)
if err != nil {
log.Fatalf("invalid start PC: %v", err)
}
end, err := strconv.ParseUint(strings.TrimPrefix(flag.Arg(2), "0x"), 16, 64)
if err != nil {
log.Fatalf("invalid end PC: %v", err)
}
dis.Print(os.Stdout, symRE, start, end, *printCode, *gnuAsm)
}
}
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