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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 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).
 
     Overridden 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=short',
            '--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 == '??':
           assert file_name == '??:0'
           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()