Commit Graph

2 Commits

Author SHA1 Message Date
Guido van Rossum 4f5e1cb00a
GH-98831: Refactor and fix cases generator (#99526)
Also complete cache effects for BINARY_SUBSCR family.
2022-11-17 17:06:07 -08:00
Guido van Rossum 41bc101dd6
GH-98831: "Generate" the interpreter (#98830)
The switch cases (really TARGET(opcode) macros) have been moved from ceval.c to generated_cases.c.h. That file is generated from instruction definitions in bytecodes.c (which impersonates a C file so the C code it contains can be edited without custom support in e.g. VS Code).

The code generator lives in Tools/cases_generator (it has a README.md explaining how it works). The DSL used to describe the instructions is a work in progress, described in https://github.com/faster-cpython/ideas/blob/main/3.12/interpreter_definition.md.

This is surely a work-in-progress. An easy next step could be auto-generating super-instructions.

**IMPORTANT: Merge Conflicts**

If you get a merge conflict for instruction implementations in ceval.c, your best bet is to port your changes to bytecodes.c. That file looks almost the same as the original cases, except instead of `TARGET(NAME)` it uses `inst(NAME)`, and the trailing `DISPATCH()` call is omitted (the code generator adds it automatically).
2022-11-02 21:31:26 -07:00