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A C compiler written in Python

Project Description

ShivyC is a C compiler written purely in Python 3, targeting Linux x86-64 machines. ShivyC seeks to eventually support the entire C11 standard and produce reasonably efficient code. For ShivyC’s current feature set, see the test files in the tests/general_tests and tests/feature_tests directories.

ShivyC is a rewrite from scratch of my older attempt at a C compiler, ShivC, with much more emphasis on feature completeness and code quality. See the ShivC README for more details on the target improvements.

Running

Requires Python 3 and the GNU binutils for assembling and linking. Run ./shivyc.py for usage info. To run the tests:

python3 -m unittest discover

Implementation Overview

Preprocessor

ShivyC currently has a very limited preprocessor that parses out comments and expands #include directives. These features are implemented between lexer.py and preproc.py. A more complete preprocessor will be implemented.

Lexer

The ShivyC lexer is implemented primarily in lexer.py. Additionally, tokens.py contains definitions of the token classes used in the lexer and token_kinds.py contains instances of recognized keyword and symbol tokens.

Parser

The ShivyC parser uses recursive descent techniques for all parsing. It is implented in parser/*.py and creates a parse tree of nodes defined in tree/nodes.py and tree/expr_nodes.py.

IL generation

ShivyC traverses the parse tree to generate a flat custom IL (intermediate language). The commands for this IL are in il_cmds/*.py. Objects used for IL generation are in il_gen.py, but most of the IL generating code is in the make_code function of each tree node in tree/*.py.

ASM generation

ShivyC sequentially reads the IL commands, converting each into x86-64 assembly code. ShivyC performs register allocation using George and Appel’s iterated register coalescing algorithm; see References below. The general ASM generation functionality is in asm_gen.py, but much of the ASM generating code is in the make_asm function of each IL command in il_cmds/*.py.

Contributing

ShivyC has so far been an entirely individual project. That said, pull requests are welcome if they pass flake8 and are well-tested.

Release History

Release History

This version
History Node

0.1.2

History Node

0.1.0

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File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
shivyc-0.1.2-py3-none-any.whl (5.3 kB) Copy SHA256 Checksum SHA256 py3 Wheel May 1, 2017
shivyc-0.1.2.tar.gz (3.3 kB) Copy SHA256 Checksum SHA256 Source May 1, 2017

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