/tools/rb/fix_macosx_stack.py
Python | 142 lines | 115 code | 5 blank | 22 comment | 5 complexity | 636868e4950dd14763a7859dee487496 MD5 | raw file
Possible License(s): GPL-2.0, Apache-2.0, LGPL-3.0, AGPL-1.0, LGPL-2.1, BSD-3-Clause, JSON, 0BSD, MIT, MPL-2.0-no-copyleft-exception
- #!/usr/bin/python
- # vim:sw=4:ts=4:et:
- # This Source Code Form is subject to the terms of the Mozilla Public
- # License, v. 2.0. If a copy of the MPL was not distributed with this
- # file, You can obtain one at http://mozilla.org/MPL/2.0/.
- # 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))