v8/tools/objdump-v8

#!/usr/bin/env python3
#
# Copyright 2016 the V8 project authors. All rights reserved.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
#     * Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above
#       copyright notice, this list of conditions and the following
#       disclaimer in the documentation and/or other materials provided
#       with the distribution.
#     * Neither the name of Google Inc. nor the names of its
#       contributors may be used to endorse or promote products derived
#       from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

import os.path
import re
import subprocess
import sys


def get_address_bounds():
  start = -1
  end = -1
  for arg in sys.argv:
    if arg.startswith("--start-address="):
      start = int(arg[-12:], 16)
    if arg.startswith("--stop-address="):
      end = int(arg[-12:], 16)
  return start, end


def format_line(line):
  pieces = line.split(None, 3)
  return " " + pieces[0][2:] + ":\t" + pieces[3]


def is_comment(line):
  stripped = line.strip()
  return stripped.startswith("--") or stripped.startswith(";;")

def main():
  filename = sys.argv[-1]
  match = re.match(r"/tmp/perf-(.*)\.map", filename)
  if match:
    start, end = get_address_bounds()
    process_codefile = "code-" + match.group(1) + "-1.asm"
    if os.path.exists(process_codefile):
      codefile = open(process_codefile, "r")
    else:
      codefile = open("code.asm", "r")
    with codefile:
      printing = False
      for line in codefile:
        if line.startswith("0x"):
          addr = int(line.split()[0], 0)
          if start <= addr <= end:
            printing = True
            sys.stdout.write(format_line(line))
          elif printing:
            break
        elif printing:
          if not is_comment(line):
            break
          else:
            sys.stdout.write(line)
  else:
    sys.argv[0] = "objdump"
    sys.exit(subprocess.call(sys.argv))

if __name__ == "__main__":
  main()