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fix_macosx_stack.py
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fix_macosx_stack.py
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#!/usr/bin/python
# vim:sw=4:ts=4:et:
# ***** BEGIN LICENSE BLOCK *****
# Version: MPL 1.1/GPL 2.0/LGPL 2.1
#
# The contents of this file are subject to the Mozilla Public License Version
# 1.1 (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
# http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS IS" basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
# for the specific language governing rights and limitations under the
# License.
#
# The Original Code is fix-linux-stack.pl.
#
# The Initial Developer of the Original Code is L. David Baron.
# Portions created by the Initial Developer are Copyright (C) 2003
# the Initial Developer. All Rights Reserved.
#
# Contributor(s):
# L. David Baron <dbaron@dbaron.org> (original author)
#
# Alternatively, the contents of this file may be used under the terms of
# either the GNU General Public License Version 2 or later (the "GPL"), or
# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
# in which case the provisions of the GPL or the LGPL are applicable instead
# of those above. If you wish to allow use of your version of this file only
# under the terms of either the GPL or the LGPL, and not to allow others to
# use your version of this file under the terms of the MPL, indicate your
# decision by deleting the provisions above and replace them with the notice
# and other provisions required by the GPL or the LGPL. If you do not delete
# the provisions above, a recipient may use your version of this file under
# the terms of any one of the MPL, the GPL or the LGPL.
#
# ***** END LICENSE BLOCK *****
# This script uses atos to process the output of nsTraceRefcnt's Mac OS
# X stack walking code. This is useful for two things:
# (1) Getting line number information out of
# |nsTraceRefcntImpl::WalkTheStack|'s output in debug builds.
# (2) Getting function names out of |nsTraceRefcntImpl::WalkTheStack|'s
# output on all builds (where it mostly prints UNKNOWN because only
# a handful of symbols are exported from component libraries).
#
# Use the script by piping output containing stacks (such as raw stacks
# or make-tree.pl balance trees) through this script.
import subprocess
import sys
import re
import os
import pty
import termios
class unbufferedLineConverter:
"""
Wrap a child process that responds to each line of input with one line of
output. Uses pty to trick the child into providing unbuffered output.
"""
def __init__(self, command, args = []):
pid, fd = pty.fork()
if pid == 0:
# We're the child. Transfer control to command.
os.execvp(command, [command] + args)
else:
# Disable echoing.
attr = termios.tcgetattr(fd)
attr[3] = attr[3] & ~termios.ECHO
termios.tcsetattr(fd, termios.TCSANOW, attr)
# Set up a file()-like interface to the child process
self.r = os.fdopen(fd, "r", 1)
self.w = os.fdopen(os.dup(fd), "w", 1)
def convert(self, line):
self.w.write(line + "\n")
return self.r.readline().rstrip("\r\n")
@staticmethod
def test():
assert unbufferedLineConverter("rev").convert("123") == "321"
assert unbufferedLineConverter("cut", ["-c3"]).convert("abcde") == "c"
print "Pass"
def separate_debug_file_for(file):
return None
address_adjustments = {}
def address_adjustment(file):
if not file in address_adjustments:
result = None
otool = subprocess.Popen(["otool", "-l", file], stdout=subprocess.PIPE)
while True:
line = otool.stdout.readline()
if line == "":
break
if line == " segname __TEXT\n":
line = otool.stdout.readline()
if not line.startswith(" vmaddr "):
raise StandardError("unexpected otool output")
result = int(line[10:], 16)
break
otool.stdout.close()
if result is None:
raise StandardError("unexpected otool output")
address_adjustments[file] = result
return address_adjustments[file]
atoses = {}
def addressToSymbol(file, address):
converter = None
if not file in atoses:
debug_file = separate_debug_file_for(file) or file
converter = unbufferedLineConverter('/usr/bin/atos', ['-o', debug_file])
atoses[file] = converter
else:
converter = atoses[file]
return converter.convert("0x%X" % address)
cxxfilt_proc = None
def cxxfilt(sym):
if cxxfilt_proc is None:
globals()["cxxfilt_proc"] = subprocess.Popen(['c++filt',
'--no-strip-underscores',
'--format', 'gnu-v3'],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE)
# strip underscores ourselves (works better than c++filt's
# --strip-underscores)
cxxfilt_proc.stdin.write(sym[1:] + "\n")
return cxxfilt_proc.stdout.readline().rstrip("\n")
line_re = re.compile("^(.*) ?\[([^ ]*) \+(0x[0-9A-F]{1,8})\](.*)$")
balance_tree_re = re.compile("^([ \|0-9-]*)")
atos_sym_re = re.compile("^(\S+) \(in ([^)]+)\) \((.+)\)$")
def fixSymbols(line):
result = line_re.match(line)
if result is not None:
# before allows preservation of balance trees
# after allows preservation of counts
(before, file, address, after) = result.groups()
address = int(address, 16)
if os.path.exists(file) and os.path.isfile(file):
address += address_adjustment(file)
info = addressToSymbol(file, address)
# atos output seems to have three forms:
# address
# address (in foo.dylib)
# symbol (in foo.dylib) (file:line)
symresult = atos_sym_re.match(info)
if symresult is not None:
# Print the first two forms as-is, and transform the third
(symbol, library, fileline) = symresult.groups()
symbol = cxxfilt(symbol)
info = "%s (%s, in %s)" % (symbol, fileline, library)
# throw away the bad symbol, but keep balance tree structure
before = balance_tree_re.match(before).groups()[0]
return before + info + after + "\n"
else:
sys.stderr.write("Warning: File \"" + file + "\" does not exist.\n")
return line
else:
return line
if __name__ == "__main__":
for line in sys.stdin:
sys.stdout.write(fixSymbols(line))