Malte Ubl
6f488e13aa
Every cycle-capable object carried a 32-byte header: trace and teardown function pointers, a 32-bit color, the buffered flag, the generation and a 64-bit candidate index. The two function pointers are the same for every object of a type, so the header now points at one constant ScrCycType { trace, free_fn } descriptor per type, and the remaining fields pack into the second word: u8 color, u8 gen, u16 buffered, u32 buf_index (candidate buffers stop at 2^31 entries). wasm32 pads before the descriptor, so every object-relative offset is the same on all targets.
Emitted shapes define their descriptor next to the trace and teardown functions; inline allocation stores one header word; the inline release reads buffered at obj-6 and the inline free reads the generation as an i8 at obj-7. Runtime families allocate with static descriptors. The program-object ABI marker moves to scr_runtime_abi_v10.
tsc-ts (interleaved, 5 rounds): peak RSS -8% to -11% on every app and mode; single-threaded wall -0.3% to -5.5% on top of the typed-rest-spread change.
External program object
This macOS arm64 example links a scriptc program object, a small C FFI implementation, and the exact installed precompiled runtime pack. It uses no scriptc cache path.
$ clang -target arm64-apple-macosx14.0.0 -O2 -c native.c -o native.o
$ scriptc build main.ts --ffi ffi.json --print=native-link-info -o app.o > link-info.json
$ node link.mjs cc link-info.json app-cc
$ ./app-cc
42
$ node link.mjs ld link-info.json app-ld
$ ./app-ld
42
cc uses the C compiler as a linker driver. ld links the same precompiled runtime objects directly with the selected Apple SDK. The object defines main; it is a complete program object, not a library to load into another process. Use scriptc build --lib --profile ... for a host-callable static library.
The external object ABI is experimental. Always consume the runtime pack at the exact runtime_pack.version reported by the same scriptc installation. The object requires scr_runtime_abi_v10, so a mismatched runtime fails during the link instead of starting with an incompatible ABI.