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)
}
}