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asan_symbolize.py
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asan_symbolize.py
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#!/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 bisect
import getopt
import os
import pty
import re
import subprocess
import sys
import termios
symbolizers = {}
DEBUG = False
demangle = False;
# FIXME: merge the code that calls fix_filename().
def fix_filename(file_name):
for path_to_cut in sys.argv[1:]:
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 GuessArch(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, addr):
super(LLVMSymbolizer, self).__init__()
self.symbolizer_path = symbolizer_path
self.default_arch = GuessArch(addr)
self.pipe = self.open_llvm_symbolizer()
def open_llvm_symbolizer(self):
cmd = [self.symbolizer_path,
'--use-symbol-table=true',
'--demangle=%s' % demangle,
'--functions=short',
'--inlining=true',
'--default-arch=%s' % self.default_arch]
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, addr):
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, addr)
class Addr2LineSymbolizer(Symbolizer):
def __init__(self, binary):
super(Addr2LineSymbolizer, self).__init__()
self.binary = binary
self.pipe = self.open_addr2line()
def open_addr2line(self):
cmd = ['addr2line', '-f']
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
try:
print >> self.pipe.stdin, offset
function_name = self.pipe.stdout.readline().rstrip()
file_name = self.pipe.stdout.readline().rstrip()
except Exception:
function_name = ''
file_name = ''
file_name = fix_filename(file_name)
return ['%s in %s %s' % (addr, function_name, file_name)]
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):
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 = GuessArch(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):
# 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.system = os.uname()[0]
if self.system not in ['Linux', 'Darwin', 'FreeBSD']:
raise Exception('Unknown system')
self.llvm_symbolizer = None
self.frame_no = 0
def symbolize_address(self, addr, binary, offset):
# Initialize llvm-symbolizer lazily.
if not self.llvm_symbolizer:
self.llvm_symbolizer = LLVMSymbolizerFactory(self.system, addr)
# 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_symbolizer])
result = symbolizers[binary].symbolize(addr, binary, offset)
if result is None:
# 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_stdin(self):
self.frame_no = 0
while True:
line = sys.stdin.readline()
if not line:
break
processed = self.process_line(line)
print ''.join(processed)
def process_line(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__':
opts, args = getopt.getopt(sys.argv[1:], "d", ["demangle"])
for o, a in opts:
if o in ("-d", "--demangle"):
demangle = True;
loop = SymbolizationLoop()
loop.process_stdin()