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5f2ae6e4f7
Adds Section::content_hash, populates it on pattern-synthesized
sections with FNV-1a-64 of the first 0x100 bytes of the decompressed
body, and emits it into recomp_overlays.inl's SectionTableEntry. The
runtime side hashes the same window over the bytes Stadium loads at
fragment_ptr and looks up the matching section by hash.
Build-time and runtime use:
- SAME hash algorithm: FNV-1a-64
- SAME window: 0x100 bytes (95% uniqueness across Stadium's 282
distinct fragment bodies; falls back to first-candidate on the
residual ~5%)
- SAME byte source: pre-relocation decompressed bytes (link-time
form, before Stadium's R_MIPS_32 patches run)
Section table emit gains the .content_hash field; non-pattern sections
get hash=0, runtime-side condition `sec.content_hash != 0` filters
them out of the candidate set.
Pairs with the runtime-side change in
lib/N64ModernRuntime/librecomp/src/overlays.cpp.
Activation in PokemonStadiumRecomp's game.toml is gated on a
follow-up: pattern-synthesized impl bodies currently get a basic
forward-CFG-walked size which produces invalid C for fragments with
internal jump tables (data interpreted as code). Future fix: emit
pattern-section impl bodies as runtime-dispatched stubs instead of
trying to statically recompile each body. Until then, fragment78
stays declared as a single static [[input.decompressed_section]];
the engine's pattern infrastructure is in place, ready to be flipped
on once the impl-body emit is reshaped.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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