12 stable releases

1.7.1 May 2, 2023
1.7.0 Apr 30, 2023
1.5.10 Feb 23, 2023
1.5.8 Dec 20, 2022

#3 in #mips

Download history 27/week @ 2023-02-09 22/week @ 2023-02-16 21/week @ 2023-02-23 4/week @ 2023-03-02 3/week @ 2023-03-16 5/week @ 2023-03-23 19/week @ 2023-03-30 19/week @ 2023-04-06 45/week @ 2023-04-13 11/week @ 2023-04-20 67/week @ 2023-04-27 36/week @ 2023-05-04 46/week @ 2023-05-11 13/week @ 2023-05-25

106 downloads per month

MIT license

5.5K SLoC

C 3K SLoC // 0.0% comments Rust 2.5K SLoC // 0.0% comments


PyPI - Downloads GitHub GitHub release (latest SemVer) PyPI crate.io GitHub contributors

MIPS instruction decoder API.


  • Should produce matching assembly.
  • Fully written in C for fast decoding.
    • The library is completely allocation-less, in other words rabbitizer doesn't allocate in anything in the heap by itself.
  • Other language bindings supported in this repo:
    • Python bindings
      • The minimal Python version is 3.7, older versions are not guaranteed to work.
    • C++ bindings
    • Rust bindings
  • Simple per-word instruction decoding.
    • The library doesn't try to be too smart by processing multiple instructions at a time.
  • Can perform validation checks for instructions.
  • Provides many examination/grouping functions for instructions, allowing to simplify checking characteristics of an instruction and minimizing the need to check for specific instructions in a hardcoded way.
  • Includes some minor tools to build your own pointer/symbol detection.
  • Configurable, many features can be turned on and off.
  • MIPS instructions features:
    • Named registers for MIPS VR4300's coprocessors.
    • Support for many pseudo-instructions.
    • Properly handle move to/from coprocessor instructions.
    • Support for numeric, o32, n32 and n64 ABI register names.
  • Some workarounds for some specific compilers/assemblers:
    • SN64:
      • div/divu fix: tweaks a bit the produced div, divu and break instructions.
  • Multiple MIPS architectures are supported:
    • Main focus on MIPS I, II and III architectures. Partial support for MIPS IV too.
    • N64 RSP instruction decoding support.
      • RSP decoding has been tested to build back to matching assemblies with armips.
    • R5900 (PS2's Emotion Engine processor) decoding support.


In order to keep it simple and fast the following features will not be added:

  • Pseudo-instructions which expands to more than one instruction.


Python bindings

The recommended way to install is using from the PyPi release, via pip:

pip install rabbitizer

In case you want to mess with the latest development version without wanting to clone the repository, then you could use the following command:

pip install git+https://github.com/Decompollaborate/rabbitizer.git@develop

NOTE: Installing the development version is not recommended. Proceed at your own risk.

See this package at https://pypi.org/project/rabbitizer/.

Rust bindings

Add this crate to your Cargo.toml via:

rabbitizer = "1.5.8"

See this crate at https://crates.io/crates/rabbitizer.



~33K SLoC