decomp-tu-slicinglisted

Find which classes shared an original .cpp translation unit in sm64ds-decomp, so a C++ conversion PR ships the right set of classes together instead of splitting a file the ROM says is one. Use before slicing a per-class migration PR, when deciding whether two classes belong in one header, when eligible.py rejects a file for extra sections or a multi-function TU, when asked which functions belong to a class in an unnamed overlay, or when reading build/tu_map.json. To then execute the merge and byte-verify it, use decomp-tu-build.
tangosdev/sm64ds-decomp · ★ 154 · Data & Documents · score 80

Install: claude install-skill tangosdev/sm64ds-decomp

# Translation-unit slicing The linker erased the original `.cpp` boundaries; `tools/tu_map.py` reads them back out. Full derivation and limits: `notes/tu-boundaries.md`. **To execute a merge and verify it, use `decomp-tu-build`** — this skill is about reading the map, not acting on it. ## 0. Regenerate the map, in this order ```sh python tools/rtti_extract.py # -> build/rtti.json python tools/rtti_vtables.py # -> build/rtti_vtables.json python tools/tu_map.py # -> build/tu_map.json ``` `build/` is gitignored, so a fresh worktree has none of this. **Nothing enforces that order, and skipping it fails silently.** `vtable_labels()` returns `{}` when `build/rtti_vtables.json` is absent, and `tu_map.py` then writes a complete, self-consistent, **wrong** map and exits **0**. Measured on `main` from an empty `build/`: | | full chain | `rtti_vtables.json` absent | |---|---|---| | whole-ROM TUs | 532 | 516 | | boundaries | `{low: 68, medium: 110, high: 280}` | `{low: 72, medium: 124, high: 246}` | | TUs with a class | 400/532 | 370/516 | | under-segmented | ov007, main, ov075, ov084 | ov007, main, **ov005**, ov084 | | ov080 | 5 TUs, 4 classed | **6 TUs**, 4 classed | | `--check` | all gates PASS, exit 0 | **all gates PASS**, exit 0 | The known-answer gate asserts ov080's *classed* TU count, which is 4 either way, so it passes for the wrong reason. The under-segmented list is itself a casualty, so you cannot use it to detect the problem either. The one visible t