#!/usr/bin/env python
#===- lib/asan/scripts/asan_symbolize.py -----------------------------------===#
#
# The LLVM Compiler Infrastructure
#
# This file is distributed under the University of Illinois Open Source
# License. See LICENSE.TXT for details.
#
#===------------------------------------------------------------------------===#
import argparse
import bisect
import getopt
import os
import re
import subprocess
import sys
symbolizers = {}
DEBUG = False
demangle = False
binutils_prefix = None
sysroot_path = None
binary_name_filter = None
fix_filename_patterns = None
logfile = sys.stdin
allow_system_symbolizer = True
# FIXME: merge the code that calls fix_filename().
def fix_filename(file_name):
if fix_filename_patterns:
for path_to_cut in fix_filename_patterns:
file_name = re.sub('.*' + path_to_cut, '', file_name)
file_name = re.sub('.*asan_[a-z_]*.cc:[0-9]*', '_asan_rtl_', file_name)
file_name = re.sub('.*crtstuff.c:0', '???:0', file_name)
return file_name
def sysroot_path_filter(binary_name):
return sysroot_path + binary_name
def guess_arch(addr):
# Guess which arch we're running. 10 = len('0x') + 8 hex digits.
if len(addr) > 10:
return 'x86_64'
else:
return 'i386'
class Symbolizer(object):
def __init__(self):
pass
def symbolize(self, addr, binary, offset):
"""Symbolize the given address (pair of binary and offset).
Overriden in subclasses.
Args:
addr: virtual address of an instruction.
binary: path to executable/shared object containing this instruction.
offset: instruction offset in the @binary.
Returns:
list of strings (one string for each inlined frame) describing
the code locations for this instruction (that is, function name, file
name, line and column numbers).
"""
return None
class LLVMSymbolizer(Symbolizer):
def __init__(self, symbolizer_path, default_arch, system, dsym_hints=[]):
super(LLVMSymbolizer, self).__init__()
self.symbolizer_path = symbolizer_path
self.default_arch = default_arch
self.system = system
self.dsym_hints = dsym_hints
self.pipe = self.open_llvm_symbolizer()
def open_llvm_symbolizer(self):
cmd = [self.symbolizer_path,
'--use-symbol-table=true',
'--demangle=%s' % demangle,
'--functions=linkage',
'--inlining=true',
'--default-arch=%s' % self.default_arch]
if self.system == 'Darwin':
for hint in self.dsym_hints:
cmd.append('--dsym-hint=%s' % hint)
if DEBUG:
print ' '.join(cmd)
try:
result = subprocess.Popen(cmd, stdin=subprocess.PIPE,
stdout=subprocess.PIPE)
except OSError:
result = None
return result
def symbolize(self, addr, binary, offset):
"""Overrides Symbolizer.symbolize."""
if not self.pipe:
return None
result = []
try:
symbolizer_input = '"%s" %s' % (binary, offset)
if DEBUG:
print symbolizer_input
print >> self.pipe.stdin, symbolizer_input
while True:
function_name = self.pipe.stdout.readline().rstrip()
if not function_name:
break
file_name = self.pipe.stdout.readline().rstrip()
file_name = fix_filename(file_name)
if (not function_name.startswith('??') or
not file_name.startswith('??')):
# Append only non-trivial frames.
result.append('%s in %s %s' % (addr, function_name,
file_name))
except Exception:
result = []
if not result:
result = None
return result
def LLVMSymbolizerFactory(system, default_arch, dsym_hints=[]):
symbolizer_path = os.getenv('LLVM_SYMBOLIZER_PATH')
if not symbolizer_path:
symbolizer_path = os.getenv('ASAN_SYMBOLIZER_PATH')
if not symbolizer_path:
# Assume llvm-symbolizer is in PATH.
symbolizer_path = 'llvm-symbolizer'
return LLVMSymbolizer(symbolizer_path, default_arch, system, dsym_hints)
class Addr2LineSymbolizer(Symbolizer):
def __init__(self, binary):
super(Addr2LineSymbolizer, self).__init__()
self.binary = binary
self.pipe = self.open_addr2line()
self.output_terminator = -1
def open_addr2line(self):
addr2line_tool = 'addr2line'
if binutils_prefix:
addr2line_tool = binutils_prefix + addr2line_tool
cmd = [addr2line_tool, '-fi']
if demangle:
cmd += ['--demangle']
cmd += ['-e', self.binary]
if DEBUG:
print ' '.join(cmd)
return subprocess.Popen(cmd,
stdin=subprocess.PIPE, stdout=subprocess.PIPE)
def symbolize(self, addr, binary, offset):
"""Overrides Symbolizer.symbolize."""
if self.binary != binary:
return None
lines = []
try:
print >> self.pipe.stdin, offset
print >> self.pipe.stdin, self.output_terminator
is_first_frame = True
while True:
function_name = self.pipe.stdout.readline().rstrip()
file_name = self.pipe.stdout.readline().rstrip()
if is_first_frame:
is_first_frame = False
elif function_name in ['', '??']:
assert file_name == function_name
break
lines.append((function_name, file_name));
except Exception:
lines.append(('??', '??:0'))
return ['%s in %s %s' % (addr, function, fix_filename(file)) for (function, file) in lines]
class UnbufferedLineConverter(object):
"""
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, args, close_stderr=False):
# Local imports so that the script can start on Windows.
import pty
import termios
pid, fd = pty.fork()
if pid == 0:
# We're the child. Transfer control to command.
if close_stderr:
dev_null = os.open('/dev/null', 0)
os.dup2(dev_null, 2)
os.execvp(args[0], 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.readline()
def readline(self):
return self.r.readline().rstrip()
class DarwinSymbolizer(Symbolizer):
def __init__(self, addr, binary):
super(DarwinSymbolizer, self).__init__()
self.binary = binary
self.arch = guess_arch(addr)
self.open_atos()
def open_atos(self):
if DEBUG:
print 'atos -o %s -arch %s' % (self.binary, self.arch)
cmdline = ['atos', '-o', self.binary, '-arch', self.arch]
self.atos = UnbufferedLineConverter(cmdline, close_stderr=True)
def symbolize(self, addr, binary, offset):
"""Overrides Symbolizer.symbolize."""
if self.binary != binary:
return None
atos_line = self.atos.convert('0x%x' % int(offset, 16))
while "got symbolicator for" in atos_line:
atos_line = self.atos.readline()
# A well-formed atos response looks like this:
# foo(type1, type2) (in object.name) (filename.cc:80)
match = re.match('^(.*) \(in (.*)\) \((.*:\d*)\)$', atos_line)
if DEBUG:
print 'atos_line: ', atos_line
if match:
function_name = match.group(1)
function_name = re.sub('\(.*?\)', '', function_name)
file_name = fix_filename(match.group(3))
return ['%s in %s %s' % (addr, function_name, file_name)]
else:
return ['%s in %s' % (addr, atos_line)]
# Chain several symbolizers so that if one symbolizer fails, we fall back
# to the next symbolizer in chain.
class ChainSymbolizer(Symbolizer):
def __init__(self, symbolizer_list):
super(ChainSymbolizer, self).__init__()
self.symbolizer_list = symbolizer_list
def symbolize(self, addr, binary, offset):
"""Overrides Symbolizer.symbolize."""
for symbolizer in self.symbolizer_list:
if symbolizer:
result = symbolizer.symbolize(addr, binary, offset)
if result:
return result
return None
def append_symbolizer(self, symbolizer):
self.symbolizer_list.append(symbolizer)
def BreakpadSymbolizerFactory(binary):
suffix = os.getenv('BREAKPAD_SUFFIX')
if suffix:
filename = binary + suffix
if os.access(filename, os.F_OK):
return BreakpadSymbolizer(filename)
return None
def SystemSymbolizerFactory(system, addr, binary):
if system == 'Darwin':
return DarwinSymbolizer(addr, binary)
elif system == 'Linux':
return Addr2LineSymbolizer(binary)
class BreakpadSymbolizer(Symbolizer):
def __init__(self, filename):
super(BreakpadSymbolizer, self).__init__()
self.filename = filename
lines = file(filename).readlines()
self.files = []
self.symbols = {}
self.address_list = []
self.addresses = {}
# MODULE mac x86_64 A7001116478B33F18FF9BEDE9F615F190 t
fragments = lines[0].rstrip().split()
self.arch = fragments[2]
self.debug_id = fragments[3]
self.binary = ' '.join(fragments[4:])
self.parse_lines(lines[1:])
def parse_lines(self, lines):
cur_function_addr = ''
for line in lines:
fragments = line.split()
if fragments[0] == 'FILE':
assert int(fragments[1]) == len(self.files)
self.files.append(' '.join(fragments[2:]))
elif fragments[0] == 'PUBLIC':
self.symbols[int(fragments[1], 16)] = ' '.join(fragments[3:])
elif fragments[0] in ['CFI', 'STACK']:
pass
elif fragments[0] == 'FUNC':
cur_function_addr = int(fragments[1], 16)
if not cur_function_addr in self.symbols.keys():
self.symbols[cur_function_addr] = ' '.join(fragments[4:])
else:
# Line starting with an address.
addr = int(fragments[0], 16)
self.address_list.append(addr)
# Tuple of symbol address, size, line, file number.
self.addresses[addr] = (cur_function_addr,
int(fragments[1], 16),
int(fragments[2]),
int(fragments[3]))
self.address_list.sort()
def get_sym_file_line(self, addr):
key = None
if addr in self.addresses.keys():
key = addr
else:
index = bisect.bisect_left(self.address_list, addr)
if index == 0:
return None
else:
key = self.address_list[index - 1]
sym_id, size, line_no, file_no = self.addresses[key]
symbol = self.symbols[sym_id]
filename = self.files[file_no]
if addr < key + size:
return symbol, filename, line_no
else:
return None
def symbolize(self, addr, binary, offset):
if self.binary != binary:
return None
res = self.get_sym_file_line(int(offset, 16))
if res:
function_name, file_name, line_no = res
result = ['%s in %s %s:%d' % (
addr, function_name, file_name, line_no)]
print result
return result
else:
return None
class SymbolizationLoop(object):
def __init__(self, binary_name_filter=None, dsym_hint_producer=None):
if sys.platform == 'win32':
# ASan on Windows uses dbghelp.dll to symbolize in-process, which works
# even in sandboxed processes. Nothing needs to be done here.
self.process_line = self.process_line_echo
else:
# Used by clients who may want to supply a different binary name.
# E.g. in Chrome several binaries may share a single .dSYM.
self.binary_name_filter = binary_name_filter
self.dsym_hint_producer = dsym_hint_producer
self.system = os.uname()[0]
if self.system not in ['Linux', 'Darwin', 'FreeBSD']:
raise Exception('Unknown system')
self.llvm_symbolizers = {}
self.last_llvm_symbolizer = None
self.dsym_hints = set([])
self.frame_no = 0
self.process_line = self.process_line_posix
def symbolize_address(self, addr, binary, offset):
# On non-Darwin (i.e. on platforms without .dSYM debug info) always use
# a single symbolizer binary.
# On Darwin, if the dsym hint producer is present:
# 1. check whether we've seen this binary already; if so,
# use |llvm_symbolizers[binary]|, which has already loaded the debug
# info for this binary (might not be the case for
# |last_llvm_symbolizer|);
# 2. otherwise check if we've seen all the hints for this binary already;
# if so, reuse |last_llvm_symbolizer| which has the full set of hints;
# 3. otherwise create a new symbolizer and pass all currently known
# .dSYM hints to it.
if not binary in self.llvm_symbolizers:
use_new_symbolizer = True
if self.system == 'Darwin' and self.dsym_hint_producer:
dsym_hints_for_binary = set(self.dsym_hint_producer(binary))
use_new_symbolizer = bool(dsym_hints_for_binary - self.dsym_hints)
self.dsym_hints |= dsym_hints_for_binary
if self.last_llvm_symbolizer and not use_new_symbolizer:
self.llvm_symbolizers[binary] = self.last_llvm_symbolizer
else:
self.last_llvm_symbolizer = LLVMSymbolizerFactory(
self.system, guess_arch(addr), self.dsym_hints)
self.llvm_symbolizers[binary] = self.last_llvm_symbolizer
# Use the chain of symbolizers:
# Breakpad symbolizer -> LLVM symbolizer -> addr2line/atos
# (fall back to next symbolizer if the previous one fails).
if not binary in symbolizers:
symbolizers[binary] = ChainSymbolizer(
[BreakpadSymbolizerFactory(binary), self.llvm_symbolizers[binary]])
result = symbolizers[binary].symbolize(addr, binary, offset)
if result is None:
if not allow_system_symbolizer:
raise Exception('Failed to launch or use llvm-symbolizer.')
# Initialize system symbolizer only if other symbolizers failed.
symbolizers[binary].append_symbolizer(
SystemSymbolizerFactory(self.system, addr, binary))
result = symbolizers[binary].symbolize(addr, binary, offset)
# The system symbolizer must produce some result.
assert result
return result
def get_symbolized_lines(self, symbolized_lines):
if not symbolized_lines:
return [self.current_line]
else:
result = []
for symbolized_frame in symbolized_lines:
result.append(' #%s %s' % (str(self.frame_no), symbolized_frame.rstrip()))
self.frame_no += 1
return result
def process_logfile(self):
self.frame_no = 0
for line in logfile:
processed = self.process_line(line)
print '\n'.join(processed)
def process_line_echo(self, line):
return [line.rstrip()]
def process_line_posix(self, line):
self.current_line = line.rstrip()
#0 0x7f6e35cf2e45 (/blah/foo.so+0x11fe45)
stack_trace_line_format = (
'^( *#([0-9]+) *)(0x[0-9a-f]+) *\((.*)\+(0x[0-9a-f]+)\)')
match = re.match(stack_trace_line_format, line)
if not match:
return [self.current_line]
if DEBUG:
print line
_, frameno_str, addr, binary, offset = match.groups()
if frameno_str == '0':
# Assume that frame #0 is the first frame of new stack trace.
self.frame_no = 0
original_binary = binary
if self.binary_name_filter:
binary = self.binary_name_filter(binary)
symbolized_line = self.symbolize_address(addr, binary, offset)
if not symbolized_line:
if original_binary != binary:
symbolized_line = self.symbolize_address(addr, binary, offset)
return self.get_symbolized_lines(symbolized_line)
if __name__ == '__main__':
parser = argparse.ArgumentParser(
formatter_class=argparse.RawDescriptionHelpFormatter,
description='ASan symbolization script',
epilog='Example of use:\n'
'asan_symbolize.py -c "$HOME/opt/cross/bin/arm-linux-gnueabi-" '
'-s "$HOME/SymbolFiles" < asan.log')
parser.add_argument('path_to_cut', nargs='*',
help='pattern to be cut from the result file path ')
parser.add_argument('-d','--demangle', action='store_true',
help='demangle function names')
parser.add_argument('-s', metavar='SYSROOT',
help='set path to sysroot for sanitized binaries')
parser.add_argument('-c', metavar='CROSS_COMPILE',
help='set prefix for binutils')
parser.add_argument('-l','--logfile', default=sys.stdin,
type=argparse.FileType('r'),
help='set log file name to parse, default is stdin')
args = parser.parse_args()
if args.path_to_cut:
fix_filename_patterns = args.path_to_cut
if args.demangle:
demangle = True
if args.s:
binary_name_filter = sysroot_path_filter
sysroot_path = args.s
if args.c:
binutils_prefix = args.c
if args.logfile:
logfile = args.logfile
else:
logfile = sys.stdin
loop = SymbolizationLoop(binary_name_filter)
loop.process_logfile()