Matthew Stanley
c2a3f6ad79
overlay: add tcc tier (toolchain-free fallback) replacing sljit; extract overlay_backend
...
Compiler-neutral tier-selection policy extracted from the mis-named
overlay_sljit.{c,h} into NEW overlay_backend.{c,h} (OverlayBackend enum +
resolve/name/active). overlay_sljit.{c,h} is now just the deprecated emitter.
New tcc tier. gcc and tcc run the IDENTICAL pipeline (recompiler -> C ->
compiler -> DLL -> loader); only the compiler binary differs, so both map to the
autocompile-spawn provider (code_provider.c) and the COMMAND is chosen by the
resolved backend (main.cpp). compile_overlays.py gains --compiler gcc|tcc: tcc
writes a separate tcc/ cache namespace, BOM-strips the C + a copy of the include
headers (tcc 0.9.27 can't skip a UTF-8 BOM), and uses tcc's built-in linker.
Backends (overlay_backend): auto (gcc if a gcc TOOLCHAIN is present, else tcc --
was sljit), gcc, tcc, auto-no-gcc (dev/test: force tcc even with gcc present, to
exercise the toolchain-less user path), sljit (DEPRECATED, gated off, lowest).
Priority: static > gcc shard > tcc shard > sljit(off) > interp. The loader scans
gcc/ then tcc/ and dedups by region+crc (filename) so a gcc shard always wins a
tie.
Self-contained tcc: with no explicit overlay_autocompile_cmd_tcc, the runtime
CONSTRUCTS the tcc command from a toolchain bundled beside the exe
(<exe>/overlay_toolchain/: embedded python + tcc + recompiler + compile_overlays.py
+ runtime headers) -- no system python or gcc needed. config_loader gains
overlay_autocompile_cmd_tcc (a dev override). autocompile cmd buffers enlarged for
the constructed path-heavy command.
Compilation stays OFF the dispatch/render thread (off-process autocompile
subprocess, same model as gcc); the main thread only spawns it and dlopens the
finished DLL.
Validated: MMX6 with overlay_backend=auto-no-gcc fills the tcc/ namespace live
from the bundled toolchain and plays through save-load + gameplay -- the exact
path the sljit tier softlocked on. The gcc path is untouched.
Runtime-only, no regen.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com >
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..
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