Matthew Stanley
2d468ee5b8
recursion(stage3): overlay (sljit + gcc-DLL) CPS parity — full native overlay coverage under CPS
...
RECURSION_BUG.md §25.5. Brings the overlay native path under continuation-passing so the
idle-freeze leak fix holds with overlay_cache=true (the production gcc>sljit>interp path).
Runtime CPS-mode flag g_psx_cps_mode (overlay_loader.c) set by a __attribute__((constructor))
emitted in the BIOS + game CPS dispatch (full_function_emitter.cpp / main_psx.cpp). Gates all
overlay/sljit CPS behavior; legacy unaffected.
sljit JIT (overlay_sljit.c), scoped:
- jr $ra publishes cpu->pc (was a bare return). jr rX already tail-transferred.
- call-containing fragments DECLINE to the interpreter (CPS-safe, depth-1) — leaf shards still
JIT. (Full sljit call coverage / per-fragment entry-switch is future work.)
gcc-DLL path — FULL native overlay coverage (validated):
- compile_overlays.py --cps sets PSX_CPS for the recompiler -> CPS overlay C (tail-transfer +
per-function entry-switch; --overlay mode only affects widescreen, not CPS). DISPATCH_PREAMBLE
psx_syscall decl fixed void->int.
- PSX_OVERLAY_CODEGEN_VER 3->4: fresh cg4/ cache namespace; legacy unit-model DLLs (cg3) ignored.
- overlay_loader_dispatch: under CPS, when a dispatched addr is not an overlay ENTRY but lies
inside a registered candidate's code range (a tail-transferred call's continuation),
overlay_find_by_range() re-enters that function with cpu->pc=addr so its entry-switch routes
to the block. gcc DLLs are the trusted tier (diff-validated at entry) -> run native directly.
This is the CPS equivalent of the old unit-model that fixed the dwarf->overworld blue screen.
Validated: CPS overlay DLLs compile + load + dispatch_native>0; with continuation routing
dispatch_interp_fallback -> 0 (full native), ce_profile FLAT (6 KB), boots clean. Addresses are
KSEG0-consistent.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com >
2026-06-18 13:35:31 -07:00
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