uncompyle6 2.3.4

Python byte-code disassembler and source-code converter

uncompyle6

A native Python bytecode Disassembler, Decompiler, Fragment Decompiler and bytecode library. Follows in the tradition of decompyle, uncompyle, and uncompyle2.

Introduction

uncompyle6 translates Python bytecode back into equivalent Python source code. It accepts bytecodes from Python version 2.5 to 3.4 or so. The code requires Python 2.6 or later and has been tested on Python running versions 2.6, 2.7, 3.3, 3.4 and 3.5.

Why this?

There were a number of decompyle, uncompile, uncompyle2, uncompyle3 forks around. All of them come basically from the same code base, and almost all of them not maintained very well. This code pulls these together and addresses a number of open issues in those.

What makes this different from other CPython bytecode decompilers? Its ability to deparse just fragments and give source-code information around a given bytecode offset.

I use this to deparse fragments of code inside my trepan debuggers. For that, I need to record text fragments for all bytecode offsets (of interest). This purpose although largely compatible with the original intention is yet a little bit different. See this for more information.

The idea of Python fragment deparsing given an instruction offset can be used in showing stack traces or any program that wants to show a location in more detail than just a line number. It can be also used when source-code information does not exist and there is just bytecode information.

Other parts of the library can be used inside Python for various bytecode-related tasks. For example you can read in bytecode, i.e. perform a version-independent marshal.loads(), and disassemble the bytecode using a version of Python different from the one used to compile the bytecode.

Installation

This uses setup.py, so it follows the standard Python routine:

pip install -r requirements.txt
pip install -r requirements-dev.txt
python setup.py install # may need sudo
# or if you have pyenv:
python setup.py develop

A GNU makefile is also provided so make install (possibly as root or sudo) will do the steps above.

Testing

make check

A GNU makefile has been added to smooth over setting running the right command, and running tests from fastest to slowest.

If you have remake installed, you can see the list of all tasks including tests via remake –tasks

Usage

Run

./bin/uncompyle6 -h
./bin/pydisassemble -h

for usage help.

Known Bugs/Restrictions

Python 2 deparsing is probably as solid as the various versions of uncompyle2. Python 3 deparsing is okay but not as solid. Python 3.5 is missing some of new opcodes added, but still often works.

See Also

• https://github.com/zrax/pycdc : supports all versions of Python and is written in C++

• https://code.google.com/archive/p/unpyc3/ : supports Python 3.2 only

The above projects use a different decompiling technique what is used here.

The HISTORY file.