Drew T
c4380c19e4
MEASURED (denominators in .run/S67_findings.md): * 193 of the 530 open functions ALREADY have a draft on disk (1,885 wave targets seen, 1,521 banked, 171 open-no-draft, 166 never drawn). Classified in their real TUs: 37 MATCH / 67 NEAR / 89 CC1-FAIL. * 159 open functions (30% of the frontier) reference a jump table; 96 are PLAN-REFUSED by build_carve (non-contiguous same-subseg .rodata), 75 non-main across 38 subsegs. Not a codegen wall and not a decl wall — carve plumbing. NEW * tools/strand_census.py — coverage-asserted census + rtu_match classifier + draft staging. Keys binary:fn (R48); classifies each pair once after merging every manifest's view. * tools/o0_detect.py — the -O0 prologue tell extracted from match_one (which parses argv at import and therefore cannot be imported). match_one re-exports it; ONE definition (R33). Wiring it into the classifier turned md_MAIN_003 from 8 NEAR (7 of them >20) into 6 MATCH. Negative-controlled both directions. * tools/scope_demote_drafts.py — §8d as an _xform-contract gate rung. NOT yet exercised. FIXED * jtbl_carve --probe now runs build_carve (a pure planner) and reports plan-refused. It previously called only island_probe, which answers a necessary-not-sufficient question — every blocked function probed "carveable", and S66 priced 32 of them as free on that. * blocker_probe.macro_scope selects the LAST #define per macro name, matching cpp. engine_core.h has 1,037 duplicate DEFINE_func_ names and 4 with DIFFERENT bodies. NOT VALIDATED — DO NOT SCALE * jr_isolate_all: two real defects fixed (carried types deduped by name; header-provided types no longer re-emitted) but ov_SC02_000 STILL fails the byte gate after them. Open lead: file_scope_types carries a block without its enclosing #if guard. 20 of 35 blocked overlays dry-run clean and that number means nothing until one round-trips. 0 functions banked this session. tools-health has ONE pre-existing cdecl defect (1 of 74,749 declarations, func_8017EE08_p55352/struct ZnRec) — cdecl.py and its inputs are byte-identical to HEAD, so it is not from this change. Knowledge banked: cookbook §322/§323/§323a/§323b, decision-log pivot, accelerators #13/#14.
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.