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Source file src/cmd/objdump/main.go

Documentation: cmd/objdump

  // 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 symRE *regexp.Regexp
  
  func usage() {
  	fmt.Fprintf(os.Stderr, "usage: go tool objdump [-S] [-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)
  	}
  
  	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)
  		os.Exit(0)
  
  	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)
  		os.Exit(0)
  	}
  }
  

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