James Robinson | 646469d | 2014-10-03 15:33:28 -0700 | [diff] [blame] | 1 | # Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| 2 | # Use of this source code is governed by a BSD-style license that can be |
| 3 | # found in the LICENSE file. |
| 4 | |
| 5 | ''' A bunch of helper functions for querying gdb.''' |
| 6 | |
| 7 | import logging |
| 8 | import os |
| 9 | import re |
| 10 | import tempfile |
| 11 | |
| 12 | GDB_LINE_RE = re.compile(r'Line ([0-9]*) of "([^"]*)".*') |
| 13 | |
| 14 | def _GdbOutputToFileLine(output_line): |
| 15 | ''' Parse the gdb output line, return a pair (file, line num) ''' |
| 16 | match = GDB_LINE_RE.match(output_line) |
| 17 | if match: |
| 18 | return match.groups()[1], match.groups()[0] |
| 19 | else: |
| 20 | return None |
| 21 | |
| 22 | def ResolveAddressesWithinABinary(binary_name, load_address, address_list): |
| 23 | ''' For each address, return a pair (file, line num) ''' |
| 24 | commands = tempfile.NamedTemporaryFile() |
| 25 | commands.write('add-symbol-file "%s" %s\n' % (binary_name, load_address)) |
| 26 | for addr in address_list: |
| 27 | commands.write('info line *%s\n' % addr) |
| 28 | commands.write('quit\n') |
| 29 | commands.flush() |
| 30 | gdb_commandline = 'gdb -batch -x %s 2>/dev/null' % commands.name |
| 31 | gdb_pipe = os.popen(gdb_commandline) |
| 32 | result = gdb_pipe.readlines() |
| 33 | |
| 34 | address_count = 0 |
| 35 | ret = {} |
| 36 | for line in result: |
| 37 | if line.startswith('Line'): |
| 38 | ret[address_list[address_count]] = _GdbOutputToFileLine(line) |
| 39 | address_count += 1 |
| 40 | if line.startswith('No line'): |
| 41 | ret[address_list[address_count]] = (None, None) |
| 42 | address_count += 1 |
| 43 | gdb_pipe.close() |
| 44 | commands.close() |
| 45 | return ret |
| 46 | |
| 47 | class AddressTable(object): |
| 48 | ''' Object to do batched line number lookup. ''' |
| 49 | def __init__(self): |
| 50 | self._load_addresses = {} |
| 51 | self._binaries = {} |
| 52 | self._all_resolved = False |
| 53 | |
| 54 | def AddBinaryAt(self, binary, load_address): |
| 55 | ''' Register a new shared library or executable. ''' |
| 56 | self._load_addresses[binary] = load_address |
| 57 | |
| 58 | def Add(self, binary, address): |
| 59 | ''' Register a lookup request. ''' |
| 60 | if binary == '': |
| 61 | logging.warn('adding address %s in empty binary?' % address) |
| 62 | if binary in self._binaries: |
| 63 | self._binaries[binary].append(address) |
| 64 | else: |
| 65 | self._binaries[binary] = [address] |
| 66 | self._all_resolved = False |
| 67 | |
| 68 | def ResolveAll(self): |
| 69 | ''' Carry out all lookup requests. ''' |
| 70 | self._translation = {} |
| 71 | for binary in self._binaries.keys(): |
| 72 | if binary != '' and binary in self._load_addresses: |
| 73 | load_address = self._load_addresses[binary] |
| 74 | addr = ResolveAddressesWithinABinary( |
| 75 | binary, load_address, self._binaries[binary]) |
| 76 | self._translation[binary] = addr |
| 77 | self._all_resolved = True |
| 78 | |
| 79 | def GetFileLine(self, binary, addr): |
| 80 | ''' Get the (filename, linenum) result of a previously-registered lookup |
| 81 | request. |
| 82 | ''' |
| 83 | if self._all_resolved: |
| 84 | if binary in self._translation: |
| 85 | if addr in self._translation[binary]: |
| 86 | return self._translation[binary][addr] |
| 87 | return (None, None) |