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el runtime: prototype + fix channel/mutex seed ABI for modern clang

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el_runtime.h declared only __thread_create/__thread_join; the mutex and
channel seed primitives (__mutex_*, __channel_*) were defined in
el_runtime.c but never prototyped. Under Apple clang 21 (C11) the missing
prototypes became implicit-declaration errors, and the void-returning
__channel_send/__channel_close mis-typed el_val_t (long long) returns,
so any El program using runtime/channel.el failed to compile.

- add prototypes for __mutex_new/lock/unlock and all __channel_* to el_runtime.h
- make __channel_send/__channel_close return el_val_t nil so elc's
  trailing-expression codegen for the void El wrappers type-checks

Additive; unbreaks native channels for every downstream El program.
This commit is contained in:
bigmerge
2026-08-14 20:18:06 -05:00
parent 112bb2540f
commit b2aac4bf89
2 changed files with 22 additions and 7 deletions
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lang/el-compiler/runtime/el_runtime.h
+13
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@@ -803,6 +803,19 @@ el_val_t emit_event(el_val_t name, el_val_t duration_ms);
el_val_t __thread_create(el_val_t fn_name_v, el_val_t arg_v);
el_val_t __thread_join(el_val_t tid_v);
/* Mutex + channel seed primitives (defined in el_runtime.c). Declared here so
* that compiled El programs which use runtime/thread.el's with_mutex helper or
* runtime/channel.el's Go-style channels see real prototypes instead of an
* implicit int-return declaration (which the C11 ABI mis-truncates el_val_t). */
el_val_t __mutex_new(void);
void __mutex_lock(el_val_t m_v);
void __mutex_unlock(el_val_t m_v);
el_val_t __channel_new(el_val_t capacity_v);
el_val_t __channel_send(el_val_t ch_v, el_val_t msg_v);
el_val_t __channel_recv(el_val_t ch_v);
el_val_t __channel_try_recv(el_val_t ch_v);
el_val_t __channel_close(el_val_t ch_v);
/* ── __ prefixed aliases (self-hosting compiler ABI) ─────────────────────────
* The El self-hosting compiler emits calls to __-prefixed names. These are
* forwarding wrappers around the existing el_runtime functions above. */