Python bytecode tools
Bytecode tools are combination of multiple necessary modules to play with Python bytecode. Most of the bytecode related modules are version specific and they won't support other python versions.
Bytecode won't be same across versions, new opcodes will be added or opcodes will be removed or modified, so python standard library modules won't work with other version generated bytecodes.
marshal module, it's purpose is to
deserialize code objects, they are version specific. Like wise
dis module, there is a heavy difference in disassembling
wordcode AND opcode differences make this version incompatible.
Our goal is to make
bytecode_tools work with any
Cpython version, Aim is to build below tools.
|unmarshal||deserialize the code obejcts.|
|pydis||Disassembler for any Cpython version.|
|pycdecode||Decoder for bytecode chache files (
|hackdis||Hack the disassembled bytecode|
|decompiler||A decompiler for Cpython x.x|
How to deal with bytecode_tools?
Clone this repo and
python setup.py installor use
pip install .
Install directly from PyPi
pip install bytecode-tools
What is pydis?
pydis is a python disassembler, it can be a drop in replacement for cpython's
Pydis supports all the cpython versions above 2.5, every verion above 2.5 supports other versions. This means, pydis decodes 2.6 bytes code in 3.6 and vice versa.
dis moduel is super helpful for looking inside code objects, but it
won't support other python versions. If the code object is created through
python 3.5 and try to disassemble with
python3.6, it won't work.
Each python version gets changes to opcodes, there will be ne ones added and few are deleted. Unless you recreate the code object with new python version, the same code object can't be interpreted with old versions.
Disassemble a statement.
>>> from bytecode_tools import pydis >>> pydis.dis("a=1") 1 0 LOAD_CONST 0 (1) 2 STORE_NAME 0 (a) 4 LOAD_CONST 1 (None) 6 RETURN_VALUE
Disassble a function object.
>>> def foo(): print(123) a = 1 b = 2 c = a + b return c >>> pydis.dis(foo) 2 0 LOAD_GLOBAL 0 (print) 2 LOAD_CONST 1 (123) 4 CALL_FUNCTION 1 6 POP_TOP 3 8 LOAD_CONST 2 (1) 10 STORE_FAST 0 (a) 4 12 LOAD_CONST 3 (2) 14 STORE_FAST 1 (b) 5 16 LOAD_FAST 0 (a) 18 LOAD_FAST 1 (b) 20 BINARY_ADD 22 STORE_FAST 2 (c) 6 24 LOAD_FAST 2 (c) 26 RETURN_VALUE
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