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126 lines
3.8 KiB
Python
126 lines
3.8 KiB
Python
# Copyright (c) 2015-2016, 2818-2019 by Rocky Bernstein
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# Copyright (c) 2005 by Dan Pascu <dan@windowmaker.org>
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# Copyright (c) 2000-2002 by hartmut Goebel <h.goebel@crazy-compilers.com>
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# Copyright (c) 1999 John Aycock
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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CPython magic- and version- independent disassembly routines
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There are two reasons we can't use Python's built-in routines
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from dis. First, the bytecode we are extracting may be from a different
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version of Python (different magic number) than the version of Python
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that is doing the extraction.
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Second, we need structured instruction information for the
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(de)-parsing step. Python 3.4 and up provides this, but we still do
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want to run on earlier Python versions.
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"""
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from __future__ import print_function
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import sys
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from collections import deque
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import uncompyle6
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from xdis.code import iscode
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from xdis.load import check_object_path, load_module
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from uncompyle6.scanner import get_scanner
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def disco(version, co, out=None, is_pypy=False):
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"""
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diassembles and deparses a given code block 'co'
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"""
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assert iscode(co)
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# store final output stream for case of error
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real_out = out or sys.stdout
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print('# Python %s' % version, file=real_out)
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if co.co_filename:
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print('# Embedded file name: %s' % co.co_filename,
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file=real_out)
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scanner = get_scanner(version, is_pypy=is_pypy)
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queue = deque([co])
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disco_loop(scanner.ingest, queue, real_out)
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def disco_loop(disasm, queue, real_out):
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while len(queue) > 0:
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co = queue.popleft()
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if co.co_name != '<module>':
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print('\n# %s line %d of %s' %
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(co.co_name, co.co_firstlineno, co.co_filename),
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file=real_out)
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tokens, customize = disasm(co)
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for t in tokens:
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if iscode(t.pattr):
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queue.append(t.pattr)
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elif iscode(t.attr):
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queue.append(t.attr)
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print(t, file=real_out)
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pass
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pass
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# def disassemble_fp(fp, outstream=None):
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# """
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# disassemble Python byte-code from an open file
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# """
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# (version, timestamp, magic_int, co, is_pypy,
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# source_size) = load_from_fp(fp)
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# if type(co) == list:
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# for con in co:
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# disco(version, con, outstream)
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# else:
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# disco(version, co, outstream, is_pypy=is_pypy)
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# co = None
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def disassemble_file(filename, outstream=None):
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"""
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disassemble Python byte-code file (.pyc)
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If given a Python source file (".py") file, we'll
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try to find the corresponding compiled object.
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"""
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filename = check_object_path(filename)
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(version, timestamp, magic_int, co, is_pypy,
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source_size) = load_module(filename)
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if type(co) == list:
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for con in co:
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disco(version, con, outstream)
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else:
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disco(version, co, outstream, is_pypy=is_pypy)
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co = None
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def _test():
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"""Simple test program to disassemble a file."""
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argc = len(sys.argv)
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if argc != 2:
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if argc == 1:
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fn = __file__
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else:
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sys.stderr.write("usage: %s [-|CPython compiled file]\n" % __file__)
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sys.exit(2)
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else:
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fn = sys.argv[1]
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disassemble_file(fn)
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if __name__ == "__main__":
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_test()
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