shaka-packager/tools/find_runtime_symbols/find_runtime_symbols.py

#!/usr/bin/env python
# Copyright (c) 2012 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Find symbols in a binary corresponding to given runtime virtual addresses.

Note that source file names are treated as symbols in this script while they
are actually not.
"""

import json
import logging
import os
import sys

from static_symbols import StaticSymbolsInFile
from proc_maps import ProcMaps

try:
  from collections import OrderedDict  # pylint: disable=E0611
except ImportError:
  BASE_PATH = os.path.dirname(os.path.abspath(__file__))
  SIMPLEJSON_PATH = os.path.join(BASE_PATH, os.pardir, os.pardir, 'third_party')
  sys.path.insert(0, SIMPLEJSON_PATH)
  from simplejson import OrderedDict


FUNCTION_SYMBOLS = 0
SOURCEFILE_SYMBOLS = 1
TYPEINFO_SYMBOLS = 2

_MAPS_FILENAME = 'maps'
_FILES_FILENAME = 'files.json'


class RuntimeSymbolsInProcess(object):
  def __init__(self):
    self._maps = None
    self._static_symbols_in_filse = {}

  def find_procedure(self, runtime_address):
    for vma in self._maps.iter(ProcMaps.executable):
      if vma.begin <= runtime_address < vma.end:
        static_symbols = self._static_symbols_in_filse.get(vma.name)
        if static_symbols:
          return static_symbols.find_procedure_by_runtime_address(
              runtime_address, vma)
        else:
          return None
    return None

  def find_sourcefile(self, runtime_address):
    for vma in self._maps.iter(ProcMaps.executable):
      if vma.begin <= runtime_address < vma.end:
        static_symbols = self._static_symbols_in_filse.get(vma.name)
        if static_symbols:
          return static_symbols.find_sourcefile_by_runtime_address(
              runtime_address, vma)
        else:
          return None
    return None

  def find_typeinfo(self, runtime_address):
    for vma in self._maps.iter(ProcMaps.constants):
      if vma.begin <= runtime_address < vma.end:
        static_symbols = self._static_symbols_in_filse.get(vma.name)
        if static_symbols:
          return static_symbols.find_typeinfo_by_runtime_address(
              runtime_address, vma)
        else:
          return None
    return None

  @staticmethod
  def load(prepared_data_dir):
    symbols_in_process = RuntimeSymbolsInProcess()

    with open(os.path.join(prepared_data_dir, _MAPS_FILENAME), mode='r') as f:
      symbols_in_process._maps = ProcMaps.load(f)
    with open(os.path.join(prepared_data_dir, _FILES_FILENAME), mode='r') as f:
      files = json.load(f)

    # pylint: disable=W0212
    for vma in symbols_in_process._maps.iter(ProcMaps.executable_and_constants):
      file_entry = files.get(vma.name)
      if not file_entry:
        continue

      static_symbols = StaticSymbolsInFile(vma.name)

      nm_entry = file_entry.get('nm')
      if nm_entry and nm_entry['format'] == 'bsd':
        with open(os.path.join(prepared_data_dir, nm_entry['file']), 'r') as f:
          static_symbols.load_nm_bsd(f, nm_entry['mangled'])

      readelf_entry = file_entry.get('readelf-e')
      if readelf_entry:
        with open(os.path.join(prepared_data_dir, readelf_entry['file']),
                  'r') as f:
          static_symbols.load_readelf_ew(f)

      decodedline_file_entry = file_entry.get('readelf-debug-decodedline-file')
      if decodedline_file_entry:
        with open(os.path.join(prepared_data_dir,
                               decodedline_file_entry['file']), 'r') as f:
          static_symbols.load_readelf_debug_decodedline_file(f)

      symbols_in_process._static_symbols_in_filse[vma.name] = static_symbols

    return symbols_in_process


def _find_runtime_function_symbols(symbols_in_process, addresses):
  result = OrderedDict()
  for address in addresses:
    if isinstance(address, basestring):
      address = int(address, 16)
    found = symbols_in_process.find_procedure(address)
    if found:
      result[address] = found.name
    else:
      result[address] = '0x%016x' % address
  return result


def _find_runtime_sourcefile_symbols(symbols_in_process, addresses):
  result = OrderedDict()
  for address in addresses:
    if isinstance(address, basestring):
      address = int(address, 16)
    found = symbols_in_process.find_sourcefile(address)
    if found:
      result[address] = found
    else:
      result[address] = ''
  return result


def _find_runtime_typeinfo_symbols(symbols_in_process, addresses):
  result = OrderedDict()
  for address in addresses:
    if isinstance(address, basestring):
      address = int(address, 16)
    if address == 0:
      result[address] = 'no typeinfo'
    else:
      found = symbols_in_process.find_typeinfo(address)
      if found:
        if found.startswith('typeinfo for '):
          result[address] = found[13:]
        else:
          result[address] = found
      else:
        result[address] = '0x%016x' % address
  return result


_INTERNAL_FINDERS = {
    FUNCTION_SYMBOLS: _find_runtime_function_symbols,
    SOURCEFILE_SYMBOLS: _find_runtime_sourcefile_symbols,
    TYPEINFO_SYMBOLS: _find_runtime_typeinfo_symbols,
    }


def find_runtime_symbols(symbol_type, symbols_in_process, addresses):
  return _INTERNAL_FINDERS[symbol_type](symbols_in_process, addresses)


def main():
  # FIX: Accept only .pre data
  if len(sys.argv) < 2:
    sys.stderr.write("""Usage:
%s /path/to/prepared_data_dir/ < addresses.txt
""" % sys.argv[0])
    return 1

  log = logging.getLogger('find_runtime_symbols')
  log.setLevel(logging.WARN)
  handler = logging.StreamHandler()
  handler.setLevel(logging.WARN)
  formatter = logging.Formatter('%(message)s')
  handler.setFormatter(formatter)
  log.addHandler(handler)

  prepared_data_dir = sys.argv[1]
  if not os.path.exists(prepared_data_dir):
    log.warn("Nothing found: %s" % prepared_data_dir)
    return 1
  if not os.path.isdir(prepared_data_dir):
    log.warn("Not a directory: %s" % prepared_data_dir)
    return 1

  symbols_in_process = RuntimeSymbolsInProcess.load(prepared_data_dir)
  symbols_dict = find_runtime_symbols(FUNCTION_SYMBOLS,
                                      symbols_in_process,
                                      sys.stdin)
  for address, symbol in symbols_dict:
    if symbol:
      print '%016x %s' % (address, symbol)
    else:
      print '%016x' % address

  return 0


if __name__ == '__main__':
  sys.exit(main())