Drew T
3a886b9652
FIVE independently-MATCHed ov_SC06_029 bodies were rejected by a `parse error before '#'` in a file
the GATE ITSELF generates, at a line no draft contains. The isolation emitted, into the §8b carried
decl layer:
extern #define CALL_80185C6C ((void *(*)(s32, s32))func_80185C6C) extern void func_8012C218();
CAUSE. Every peeler in the TU-split chain asked `line.strip().startswith("/*")`, which is blind to a
comment a construct opens MID-LINE and wraps. The declaration ends at its `;` BEFORE the `/*`, so
the caller resumed on the comment's PROSE with in_block=False — and the prose is hostile: `(s32,s32)`
closes a depth-0 paren, `seen_header` latches, and every later `;` reads as a K&R parameter
declaration, so one "construct" swallowed the whole preamble. `parse_overlay_c` then anchored a
`def` on a pure declaration run and `def_proto` rendered it as that definition's implied prototype.
A SECOND defect rode along: `_file_scope_decls` hoisted such a col-0 line VERBATIM, unterminated
`/*` included, so the carried layer opened a comment that silently ate the next two declarations —
a dropped file-scope decl is a silent byte-changer. Building the guard exposed a THIRD: `_strip`
tested for `/*` before stripping `//`, so `// … src/*/*.c` (7 lines in 5 sources) opened a phantom
block comment and blanked everything to the next `*/`.
FIX: one derived comment-state oracle, `comment_open_at()` (R33) — per line, does it BEGIN inside a
block comment — consulted by parse_overlay_c, def_proto, split_src_region.parse and
jr_isolate_all._file_scope_decls (which also truncates a hoisted decl at an unterminated `/*`).
`_strip` now lexes left to right. `parse_overlay_c` RAISES (R43) when a wrapped comment closes with
code after the `*/`, because that construct could never anchor — 0 occurrences fleet-wide.
MEASURED, not assumed:
* the shape occurs 238 times across 193 tracked .c files; 153 are col-0 hoistable declarations in
150 files — every one a binary whose next isolation would have carried a broken decl layer.
* A/B over all 4,188 tracked sources, old parser vs new: round-trip identity 4188/4188 both ways;
exactly 2 files' item lists change, each losing one PHANTOM def and gaining nothing; malformed
implied prototypes 999 -> 984; 0 refusals.
* negative control BEFORE any edit: ov_SC06_029 extract+build -j+check BYTE-IDENTICAL b7b0d4ae.
* with the fix, gate_stage banked 5 of 6 drafts, counted from the SOURCE; the 6th
(func_80184084) is the separate CARVE-REFUSED class.
The 984 residual malformed prototypes are a DIFFERENT pre-existing trigger (col-0 lines gluing
declarations to DEFINE_func_*() invocations); 4 still carry a `#` and survive only because it lands
in a dropped segment. Named in §437, deliberately not fixed here.
Cookbook §437 + a SETUP.md tooling-ledger row for comment_open_at (parse_overlay_c may now raise).
The banks themselves are NOT in this commit: the agent's worktree predated func_8017F9C0's bank, so
adopting its TU verbatim would have destroyed one. They get re-gated against HEAD with these tools.
BFM-decomp
A matching decompilation of Brave Fencer Musashi (PlayStation, SLUS-00726, USA 1998) — the first public decompilation effort for this game.
What "matching" means
The goal is C source code that, compiled with the original-era toolchain (PsyQ 4.x / GCC 2.7.2-family + ASPSX via maspsx), produces a byte-for-byte identical SLUS_007.26 and, eventually, byte-identical overlay binaries. SHA1 checksums are the ground truth; "functionally equivalent" does not count.
No ROM content
This repository contains no game assets, no disassembly output, and no ROM-derived data — only source code, build configuration, symbol names/addresses, hashes, and documentation. To build or contribute you must provide your own dump of the game disc (4-track BIN/CUE, redump layout). See .gitignore for the firewall.
Project status
Latest (Phase 19, 2026-06-20): the project builds 136 binaries byte-identical from a clean tree (the EXE + the resident engine + all 134 location overlays);
make check-all→ 136/136. Fleet byte-identical-from-source is 58.0% (function-instance-weighted; see the PhaseEnds for the byte-weighted ~30% figure and what it includes). Shared engine functions are matched once inov_SC01_077and propagated ×134 viatools/dedup_propagate.py. (The narrative below is Phase-11/12-era; a full refresh is part of the public-flip prep.)
Gen1 (foundation) complete — the matching pipeline is proven end-to-end. make extract && make build && make check rebuilds SLUS_007.26 byte-for-byte identical (SHA1 143dbb89…) from C + assembly, reproducibly across many sessions.
- Compiler pinned by evidence:
gcc-2.7.2-psx -O2 -G0 -mips1 -mcpu=3000+maspsx --aspsx-version=2.56 --expand-div. - 52 functions hand-matched to byte-identical machine code — including the LZSS streaming decompressor — with a decomp-permuter + matching-cookbook "flywheel" to accelerate the next.
- 959 PsyQ SDK functions linked byte-identical (libcd, libgs, libgte, libspu/libsnd, libgpu, libc2, libmcrd, libapi/libcard, libetc) straight from the real PsyQ 4.0 libraries instead of re-decompiling them — bringing byte-identical-from-source coverage of the EXE to ~50%.
- File-loader / overlay system reverse-engineered, with the resident engine blob + location overlays' load addresses proven byte-identical against a live PCSX-Redux RAM dump.
About half the EXE is still INCLUDE_ASM stubs (correct bytes, not yet C), and the bulk of the game lives in compressed overlays inside the .CD archives — Gen2 (overlays & engine at scale) is underway:
- The build toolchain is binary-agnostic (one parameterized pipeline builds any binary), and the always-resident engine blob rebuilds byte-for-byte from source (SHA1
8e17e02f…) — the second binary reconstructed exactly, after the EXE — and is now 86% hand-matched C (123 / 146 functions, up from 0): its scripting turned out to be compiled-MIPS state/mode dispatch, not a bytecode VM, and the save-file + sound (SQV) formats are documented. The harvest used a reusable swarm-of-agents + bit-for-bit byte-gate method (a wrong match can't be accepted) —tools/harvest_verify.py+tools/match_one.py, which carry straight into the overlay phase. - A cross-binary deduplication pipeline is live: a Ghidra-free signer fingerprints all 134 location overlays, and the report finds ~9,000 byte-identical function groups shared across binaries (~28 MB of collapsible code) — a single engine function is byte-identical in all 134 overlays. This is "one match unlocks many": each engine match will be auto-credited across the overlay fleet.
Current phase and detailed progress live in phase-ends/ (newest PhaseEnd_*.md = current state); methodology, rules, and the full roadmap are in PROJECT_CONTEXT.md; environment setup in docs/SETUP.md.
This project is developed primarily by Claude Code driving Ghidra through an MCP server; see CLAUDE.md.
License
Private repository for now. AGPL-3.0 is planned at public release, modeled on sotn-decomp. tools/brave-CUE/ is CUE's BRAVE extractor (GPL, source included) and retains its own license.