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Chris Tate
81b70b0ee6
* feat: add host-callback channels to library mode - the profile's `callbacks` array declares named channels and `abi.callback_register_symbol` names the one registration entry point: `int32_t <sym>(const char *name, void (*fn)(void), void *ctx)` — 0 on success, -1 for an unknown or NULL name, latest registration wins, a NULL fn clears, registrations persist across init/reset. The stored pointer's typed shape is the channel's with the opaque context first, the panic sink's layout - channel signatures ride the existing marshalling classes: params are f64/bool/string/bytes plus the u8/u32/i32 plumbing classes (outbound plumbing keeps JS's ToUint32/ToInt32, the executable FFI rule); returns are scalar only (f64/bool/u8/u32/i32/void — a buffer return needs an ownership contract the mode does not define). string/bytes parameters arrive as (ptr, len) pairs borrowed for the call's duration - compiled code reaches a channel as a signature-only ambient function declaration whose direct calls deliver synchronously on the calling thread; the recognition rides the FFI import machinery under a library flavor: SC4024 refuses a call the channels cannot serve (undeclared name or off-class signature), unused channels are legal capacity, and callback-free profiles keep the ambient ReferenceError semantics - calling an unregistered channel is the SC4025 runtime trap: a detected trap through the library funnel, so the structured sink message names the channel in its text and the entry the host called in its symbol field, and profile teachings/remediations overlay it like the rest of the runtime family - registration slots are per copy of the runtime state, the sink's story: per-archive under abi.localize_runtime (the register symbol joins the localization keep-list), per-thread instance under abi.instance_per_thread. The host callback must not reenter any library entry or unwind across library frames - both emissions produce identical behavior by construction: the slot store/fetch lives in scr_library.c (scr_library_cb_set/_require/_ctx), the generated TU emits the registration dispatch and typed indirect calls, and the trap text is assembled once at export resolution - callback-free profiles emit byte-identical program TUs and serialized IR, and executable builds are byte-identical end to end - conformance: the CB suite (tests/harness/library-callbacks.test.ts) covers the acceptance stream, unregistered and pre-registration traps, symbol exactness, teaching overlays, SC4024 refusals, capacity and callback-free postures, the localized+thread-instanced composition probe, and ASan reruns; profile-shape refusals join library-profile.test.ts * fix: preserve callback binding identity * fix: harden library callback contracts * fix: recognize project callback declarations * fix: enforce host callback declarations
20 lines
775 B
C
20 lines
775 B
C
/* CB6 (capacity posture): no compiled code references any channel, but the
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* registration symbol still dispatches every declared name — an embedder
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* can wire callbacks ahead of the program revision that uses them. */
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#include <stdint.h>
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#include <stdio.h>
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extern void cb_init(void);
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extern int32_t cb_set_callback(const char *name, void (*fn)(void), void *ctx);
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extern double cb_stream(double n, double base);
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static void on_orphan(void *ctx, double x) { (void)ctx; (void)x; }
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int main(void) {
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printf("reg orphan: %d\n", (int)cb_set_callback("orphan", (void (*)(void))on_orphan, NULL));
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printf("reg emitChunk: %d\n", (int)cb_set_callback("emitChunk", (void (*)(void))on_orphan, NULL));
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cb_init();
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printf("stream(3,7) = %g\n", cb_stream(3, 7));
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return 0;
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}
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