Cesarus85--mjolnir-vr/docs/object_matching_logs/lruv_cache_codex_checkpoint.md

lruv_cache.obj Codex checkpoint

Date: 2026-08-20

This is a Codex/Jonas-owned checkpoint ledger. It does not replace or modify any Claude-authored research or Markdown.

Scope and provenance

• Integration baseline: 018aa03f36fc0deb3e9e47c73adc4133c9c6a165.
• Isolated lane: jonas/lruv-cache-closeout-20260820.
• Unit: source/memory/lruv_cache; configuration remains NonMatching.
• Target: January 2002 cachebeta.exe, MD5 89D83CCFD47617654F3A1D3731D53E3B.
• Compiler: XDK 3911 CL 13.00.9254.1, SHA-256 483e00c47bb08d699475a642bcff15b5b2036350b31c540e88a506baf101da11, with the unchanged /O2 /Oy- /DDEBUG /Dxbox flags and repository include closure.
• GPL Demon commit edb96c7614b80b4a80a3b0cee5c5fb7c7804a3c7 was used only as a semantic/control-flow oracle. No Demon source was copied or retained.
• The five frozen objects (vehicles, ai_debug, ai_script, actions, and units) are outside this lane and were not touched.

Baseline and collision audit

The integration worktree was clean at the requested commit. The forced current rebuild disproved the reported one-residual state: this exact baseline has 16/18 strict functions, not 17/18. The stronger historical lane codex/lruv-cache-full-admission-20260729 at 345a83af is not an ancestor of the integration baseline. Its size-equal _lruv_block_new uses _ReadWriteBarrier() to keep two returns distinct, so it is inadmissible under the current no-barrier rule and was not transplanted.

Nine older LRUV branches were already checked out in separate worktrees. The only worktree reported modified was agent/lruv-cache-closeout; its worktree, index, and HEAD blobs are all exactly 80da9682f45588d03732b467bd5dd54ea4a92f36, so the status is line-ending/stat noise rather than a competing source edit. This lane therefore has no meaningful source collision.

config/parked.json has no LRUV entry. There is no stale park to remove unless the complete object first becomes strictly admissible.

Hardened strict inventory

• 16/18 real functions are strict-exact.
• 1,984/3,760 padded target function bytes and 1,880/3,640 meaningful bytes are carried by those exact functions.
• 124/192 target function relocations are carried by exact functions.
• All 26 target-owned external RDATA COMDATs are strict-exact: 1,117/1,117 bytes, zero relocations, and matching owner/storage metadata.
• The target owns no DATA, BSS, or common definition in this unit.
• Five candidate-only literal COMDATs total 16 bytes ("", " ", "\n", "name", and "cache"). They are target-undefined split owners, not target-owned credit. Candidate-only .debug$F, .debug$S, and .drectve metadata are likewise excluded from target-owned credit.

The two residuals are:

Function	Target/base bytes	Relocs	Target hash	Base hash	First divergence
_lruv_debug_to_file	464/464	20/20	fb7c7a22cacb060e9e3fa2e5a57942daa52e259dccc6b7796bf744bf28d291bb	c63c1864e6fe9be26a5208b89ff574ae8ebacd322079ea1917590503705a08a1	+0x6: target begins the callee-saved cycle with ESI; current begins it with EBX.
_lruv_block_new	1312/1296	48/48	d008a8c97b45d969b3d824f6e3daa6caa018c04e9092b80c4ec64d84e3ab954b	302c6f8b64f32700677445abb761181c03ca7ff648b5223f45a8a780e849a4a8	+0x11: target saves ESI before assigning the cache role; current assigns EBX first.

Demon-oracle experiment matrix

All variants preserved the 16 exact siblings and all 26 target-owned data sections. Neither produced a strict gain, so both were reverted completely.

ID	Independently reconstructed source shape	Size	Relocs	Candidate hash	Decision
D01	Readable nullable-name report loop with one common output statement, typed cache-name access, and the existing byte-to-page helper. This tests the exact Demon semantic/CFG lead while retaining January asserts, callbacks, strings, types, and an explicit final return.	464	20	b87d63029ca16665ea0c7bb479c3e4e772842c3c05210f5e22556af5c0ebe366	Reverted: strict nonmatch; the natural fallthrough is not the January output CFG.
D02	Keep the target-like shared-output labels, but use the typed offset-zero cache name and existing byte-to-page helper corroborated by Demon.	464	20	8b2776c4666f22765aba53a34d4bff1f09d4223456d38fb1ee53b3ae69b355aa	Reverted: closer arithmetic scheduling is not strict equality and grants no credit.

The original current source rebuilt back to both baseline hashes after the reverts. No GPL-derived implementation remains in the worktree.

Residual classification and do-not-repeat list

• _lruv_debug_to_file is a broad VC7 callee-saved-register/stack-coloring cycle. Equal size and relocation count are insufficient. The Demon natural fallthrough, typed offset-zero name spelling, helper reuse, and their combination do not close it.
• _lruv_block_new is still a source-topology/register-allocation residual at this integration tip. The historical size-equal branch is evidence only: its barrier violates the current rules, and same-size output would still not be strict equality.
• Do not retry nullable-name fallthrough, final name ternaries, typed-name-only spelling, helper-only page conversion, declaration-order/register hints, or any barrier/volatile/assembly/forced-inline/pragma/undefined-behavior/byte forcing technique.

Reopen only for January-authoritative source/local records, a strict same-shape donor, or a legal typed-C lifetime/control-flow fact that directly changes the first divergent register cycles. A fuzzy score, equal size, relocation-count equality, or semantic plausibility is not sufficient.

Disposition and validation

The object remains honestly NonMatching with two residual functions. No configuration, park manifest, symbols, source/header file, frozen object, or pre-existing Markdown is changed.

• Forced clean XDK rebuild of lruv_cache.obj: passed.
• Full halobetacache_build and libcmt_build: passed.
• Strict whole-object census: 16/18 functions; both residual measurements restored exactly to baseline; 26/26 target-owned RDATA sections exact.
• Semantic report: 470 units, 3,686 functions evaluated, 3,543 semantic_exact, 3,625 accepted_exact, zero unit errors.
• Progress and ownership validation: passed; 272/468 Halo objects remain credited at this baseline.
• Admission audit: zero candidates, zero revocations; only the pre-existing shell_xbox contradiction remains.
• Parked manifest: three active, zero stale, zero invalid; no LRUV entry.
• LRUV regression check: all 16 baseline-exact functions and all target-owned sections retained; no changed nonexact function after the reverts.
• Tool suite: 179/179 tests passed.