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| 1 # Copyright (c) 2017 The WebRTC project authors. All Rights Reserved. |
| 2 # |
| 3 # Use of this source code is governed by a BSD-style license |
| 4 # that can be found in the LICENSE file in the root of the source |
| 5 # tree. An additional intellectual property rights grant can be found |
| 6 # in the file PATENTS. All contributing project authors may |
| 7 # be found in the AUTHORS file in the root of the source tree. |
| 8 |
| 9 ''' A bunch of helper functions for querying gdb.''' |
| 10 |
| 11 import logging |
| 12 import os |
| 13 import re |
| 14 import tempfile |
| 15 |
| 16 GDB_LINE_RE = re.compile(r'Line ([0-9]*) of "([^"]*)".*') |
| 17 |
| 18 def _GdbOutputToFileLine(output_line): |
| 19 ''' Parse the gdb output line, return a pair (file, line num) ''' |
| 20 match = GDB_LINE_RE.match(output_line) |
| 21 if match: |
| 22 return match.groups()[1], match.groups()[0] |
| 23 else: |
| 24 return None |
| 25 |
| 26 def ResolveAddressesWithinABinary(binary_name, load_address, address_list): |
| 27 ''' For each address, return a pair (file, line num) ''' |
| 28 commands = tempfile.NamedTemporaryFile() |
| 29 commands.write('add-symbol-file "%s" %s\n' % (binary_name, load_address)) |
| 30 for addr in address_list: |
| 31 commands.write('info line *%s\n' % addr) |
| 32 commands.write('quit\n') |
| 33 commands.flush() |
| 34 gdb_commandline = 'gdb -batch -x %s 2>/dev/null' % commands.name |
| 35 gdb_pipe = os.popen(gdb_commandline) |
| 36 result = gdb_pipe.readlines() |
| 37 |
| 38 address_count = 0 |
| 39 ret = {} |
| 40 for line in result: |
| 41 if line.startswith('Line'): |
| 42 ret[address_list[address_count]] = _GdbOutputToFileLine(line) |
| 43 address_count += 1 |
| 44 if line.startswith('No line'): |
| 45 ret[address_list[address_count]] = (None, None) |
| 46 address_count += 1 |
| 47 gdb_pipe.close() |
| 48 commands.close() |
| 49 return ret |
| 50 |
| 51 class AddressTable(object): |
| 52 ''' Object to do batched line number lookup. ''' |
| 53 def __init__(self): |
| 54 self._load_addresses = {} |
| 55 self._binaries = {} |
| 56 self._all_resolved = False |
| 57 |
| 58 def AddBinaryAt(self, binary, load_address): |
| 59 ''' Register a new shared library or executable. ''' |
| 60 self._load_addresses[binary] = load_address |
| 61 |
| 62 def Add(self, binary, address): |
| 63 ''' Register a lookup request. ''' |
| 64 if binary == '': |
| 65 logging.warn('adding address %s in empty binary?' % address) |
| 66 if binary in self._binaries: |
| 67 self._binaries[binary].append(address) |
| 68 else: |
| 69 self._binaries[binary] = [address] |
| 70 self._all_resolved = False |
| 71 |
| 72 def ResolveAll(self): |
| 73 ''' Carry out all lookup requests. ''' |
| 74 self._translation = {} |
| 75 for binary in self._binaries.keys(): |
| 76 if binary != '' and binary in self._load_addresses: |
| 77 load_address = self._load_addresses[binary] |
| 78 addr = ResolveAddressesWithinABinary( |
| 79 binary, load_address, self._binaries[binary]) |
| 80 self._translation[binary] = addr |
| 81 self._all_resolved = True |
| 82 |
| 83 def GetFileLine(self, binary, addr): |
| 84 ''' Get the (filename, linenum) result of a previously-registered lookup |
| 85 request. |
| 86 ''' |
| 87 if self._all_resolved: |
| 88 if binary in self._translation: |
| 89 if addr in self._translation[binary]: |
| 90 return self._translation[binary][addr] |
| 91 return (None, None) |
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