CSE2410 Fall 2014 Bounce

#!/usr/bin/env python

#

# Copyright 2008 the V8 project authors. All rights reserved.

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions are

# met:

#

#     * Redistributions of source code must retain the above copyright

#       notice, this list of conditions and the following disclaimer.

#     * Redistributions in binary form must reproduce the above

#       copyright notice, this list of conditions and the following

#       disclaimer in the documentation and/or other materials provided

#       with the distribution.

#     * Neither the name of Google Inc. nor the names of its

#       contributors may be used to endorse or promote products derived

#       from this software without specific prior written permission.

#

# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# Usage: process-ticks.py <binary> <logfile>

#

# Where <binary> is the binary program name (eg, v8_shell.exe) and

# <logfile> is the log file name (eg, v8.log).

#

# This tick processor expects to find a map file for the binary named

# binary.map if the binary is named binary.exe. The tick processor

# only works for statically linked executables - no information about

# shared libraries is logged from v8 on Windows.

import os, re, sys, tickprocessor

class WindowsTickProcessor(tickprocessor.TickProcessor):

  def Unmangle(self, name):

    """Performs very simple unmangling of C++ names.

    Does not handle arguments and template arguments. The mangled names have

    the form:

       ?LookupInDescriptor@JSObject@internal@v8@@...arguments info...

    """

    # Name is mangled if it starts with a question mark.

    is_mangled = re.match("^\?(.*)", name)

    if is_mangled:

      substrings = is_mangled.group(1).split('@')

      try:

        # The function name is terminated by two @s in a row.  Find the

        # substrings that are part of the function name.

        index = substrings.index('')

        substrings = substrings[0:index]

      except ValueError:

        # If we did not find two @s in a row, the mangled name is not in

        # the format we expect and we give up.

        return name

      substrings.reverse()

      function_name = "::".join(substrings)

      return function_name

    return name

  def ParseMapFile(self, filename):

    """Parse map file and add symbol information to the cpp entries."""

    # Locate map file.

    has_dot = re.match('^([a-zA-F0-9_-]*)[\.]?.*$', filename)

    if has_dot:

      map_file_name = has_dot.group(1) + '.map'

      try:

        map_file = open(map_file_name, 'rb')

      except IOError:

        sys.exit("Could not open map file: " + map_file_name)

    else:

      sys.exit("Could not find map file for executable: " + filename)

    try:

      max_addr = 0

      min_addr = 2**30

      # Process map file and search for function entries.

      row_regexp = re.compile(' 0001:[0-9a-fA-F]{8}\s*([_\?@$0-9a-zA-Z]*)\s*([0-9a-fA-F]{8}).*')

      for line in map_file:

        row = re.match(row_regexp, line)

        if row:

          addr = int(row.group(2), 16)

          if addr > max_addr:

            max_addr = addr

          if addr < min_addr:

            min_addr = addr

          mangled_name = row.group(1)

          name = self.Unmangle(mangled_name)

          self.cpp_entries.Insert(addr, tickprocessor.CodeEntry(addr, name));

      i = min_addr

      # Mark the pages for which there are functions in the map file.

      while i < max_addr:

        page = i >> 12

        self.vm_extent[page] = 1

        i += 4096

    finally:

      map_file.close()

class WindowsCmdLineProcessor(tickprocessor.CmdLineProcessor):

  def __init__(self):

    super(WindowsCmdLineProcessor, self).__init__()

    self.binary_file = None

  def GetRequiredArgsNames(self):

    return 'binary log_file'

  def ProcessRequiredArgs(self, args):

    if len(args) != 2:

      self.PrintUsageAndExit()

    else:

      self.binary_file = args[0]

      self.log_file = args[1]

def Main():

  cmdline_processor = WindowsCmdLineProcessor()

  cmdline_processor.ProcessArguments()

  tickprocessor = WindowsTickProcessor()

  tickprocessor.ParseMapFile(cmdline_processor.binary_file)

  cmdline_processor.RunLogfileProcessing(tickprocessor)

  tickprocessor.PrintResults()

if __name__ == '__main__':

  Main()