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#!/usr/bin/python |
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# Copyright (c) 2006-2009 The Chromium Authors. All rights reserved. |
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# Use of this source code is governed by a BSD-style license that can be |
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# found in the LICENSE file. |
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|
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# gdb_helper.py |
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|
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''' A bunch of helper functions for querying gdb.''' |
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|
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import logging |
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import os |
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import re |
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import tempfile |
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|
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GDB_LINE_RE = re.compile(r'Line ([0-9]*) of "([^"]*)".*') |
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|
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def _GdbOutputToFileLine(output_line): |
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''' Parse the gdb output line, return a pair (file, line num) ''' |
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match = GDB_LINE_RE.match(output_line) |
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if match: |
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return match.groups()[1], match.groups()[0] |
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else: |
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return None |
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|
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def ResolveAddressesWithinABinary(binary_name, load_address, address_list): |
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''' For each address, return a pair (file, line num) ''' |
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commands = tempfile.NamedTemporaryFile() |
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commands.write('add-symbol-file "%s" %s\n' % (binary_name, load_address)) |
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for addr in address_list: |
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commands.write('info line *%s\n' % addr) |
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commands.write('quit\n') |
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commands.flush() |
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gdb_commandline = 'gdb -batch -x %s 2>/dev/null' % commands.name |
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gdb_pipe = os.popen(gdb_commandline) |
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result = gdb_pipe.readlines() |
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|
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address_count = 0 |
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ret = {} |
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for line in result: |
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if line.startswith('Line'): |
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ret[address_list[address_count]] = _GdbOutputToFileLine(line) |
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address_count += 1 |
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if line.startswith('No line'): |
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ret[address_list[address_count]] = (None, None) |
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address_count += 1 |
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gdb_pipe.close() |
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commands.close() |
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return ret |
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|
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class AddressTable(object): |
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''' Object to do batched line number lookup. ''' |
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def __init__(self): |
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self._load_addresses = {} |
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self._binaries = {} |
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self._all_resolved = False |
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|
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def AddBinaryAt(self, binary, load_address): |
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''' Register a new shared library or executable. ''' |
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self._load_addresses[binary] = load_address |
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|
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def Add(self, binary, address): |
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''' Register a lookup request. ''' |
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if binary == '': |
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logging.warn('adding address %s in empty binary?' % address) |
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if binary in self._binaries: |
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self._binaries[binary].append(address) |
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else: |
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self._binaries[binary] = [address] |
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self._all_resolved = False |
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|
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def ResolveAll(self): |
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''' Carry out all lookup requests. ''' |
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self._translation = {} |
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for binary in self._binaries.keys(): |
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if binary != '' and binary in self._load_addresses: |
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load_address = self._load_addresses[binary] |
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addr = ResolveAddressesWithinABinary(binary, load_address, self._binaries[binary]) |
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self._translation[binary] = addr |
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self._all_resolved = True |
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|
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def GetFileLine(self, binary, addr): |
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''' Get the (filename, linenum) result of a previously-registered lookup request. ''' |
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if self._all_resolved: |
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if binary in self._translation: |
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if addr in self._translation[binary]: |
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return self._translation[binary][addr] |
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return (None, None) |