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gh-98831: Move DSL documentation here from ideas repo by gvanrossum · Pull Request #101629 · python/cpython · GitHub

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gh-98831: Move DSL documentation here from ideas repo #101629

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gvanrossum merged 2 commits into from
Feb 7, 2023
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gh-98831: Move DSL documentation here from ideas repo #101629

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Move DSL documentation here from ideas repo
gvanrossum Feb 7, 2023
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gvanrossum Feb 7, 2023
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9 changes: 6 additions & 3 deletions Tools/cases_generator/README.md
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# Tooling to generate interpreters

Documentation for the instruction definitions in `Python/bytecodes.c`
("the DSL") is [here](interpreter_definition.md).

What's currently here:

- `lexer.py`: lexer for C, originally written by Mark Shannon
- `plexer.py`: OO interface on top of lexer.py; main class: `PLexer`
- `parser.py`: Parser for instruction definition DSL; main class `Parser`
- `generate_cases.py`: driver script to read `Python/bytecodes.c` and
write `Python/generated_cases.c.h`
- `test_generator.py`: tests, require manual running using `pytest`

The DSL for the instruction definitions in `Python/bytecodes.c` is described
[here](https://github.com/faster-cpython/ideas/blob/main/3.12/interpreter_definition.md).
Note that there is some dummy C code at the top and bottom of the file
Note that there is some dummy C code at the top and bottom of
`Python/bytecodes.c`
to fool text editors like VS Code into believing this is valid C code.

## A bit about the parser
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