Matthew Stanley
1010c58c41
overlay: flavor-tag the cache so variant builds can't cross-contaminate
...
The overlay cache keys DLLs by guest-bytes CRC, which is flavor-blind — the
same guest overlay yields the same filename whether compiled by the base
recompiler or a variant (e.g. widescreen, which emits psx_ws_*/GTE-adjust
symbols). Two flavors sharing a cache dir would collide: a base runtime could
pick up a widescreen DLL (or vice versa) with no guard, since both report ABI
v2.
Fold a codegen-flavor id into overlay_abi() (high 16 bits) and check the
combined tag in the loader's existing ABI gate. Base/master flavor is 0, so the
tag stays == PSX_OVERLAY_ABI_VERSION — fully backward compatible with every
existing base DLL (verified: an 8-DLL base cache loads with zero rejections).
A variant build sets PSX_OVERLAY_FLAVOR (e.g. widescreen: -DPSX_OVERLAY_FLAVOR=1
for the runtime, --flavor 1 for compile_overlays.py); its overlays then report a
distinct tag, so the base runtime rejects+regenerates them and vice versa. The
caches stay separate automatically, even in a shared directory — no new paths.
overlay_api.h: PSX_OVERLAY_FLAVOR (default 0) + PSX_OVERLAY_ABI_TAG.
overlay_loader.c: both ABI gates check the tag.
compile_overlays.py: --flavor arg -> -DPSX_OVERLAY_FLAVOR, baked into overlay_abi().
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com >
2026-06-14 16:04:21 -07:00
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