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https://github.com/RetroPortingToolKit/psxrecomp
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Matthew Stanley
478e2352c9
A registered overlay function is only callable while the RAM it was compiled
from is unchanged. Adds coarse, region-level write-invalidation:
- overlay_loader: each loaded DLL gets a region record {base,size,generation,
valid}; dyntab entries carry their region index. dyntab_lookup returns a
function only if its region is still valid (else counts stale_blocked and
falls through). Invalidation is O(1) (flip valid=0) — no open-addressing
deletion. DLL stays loaded; only callability is revoked
(Compiled != Registered != Callable).
- memory.c: a watched-overlay-pages bitmap, set when a region registers; one
bitmap test added to the RAM-store branch of psx_write_{word,half,byte}
(the single audited store chokepoint — all CPU + DMA writes funnel here).
A write into a watched page calls overlay_loader_invalidate_at(), which
flips the region invalid and stops watching it.
- Counters via overlay_loader_status: loads, invalidations, unregistered_funcs,
dispatch_native, dispatch_interp_fallback, stale_blocked, last_write_{pc,
addr,size}, regions.
Coarse by design: ANY write into a registered region invalidates the WHOLE
region (over-invalidation is safe — it falls back to the interpreter, which
self-heals). Per-function/dependency-range narrowing waits for the Inc2
manifest. After invalidation the region is not auto-reloaded this session
(re-registering a CRC-matched cache is also Inc2); the new content runs
interpreted, which is correct.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>