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cmd+selfhost+test: gate alloc builtin behind same-module fn alloc

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Mirrors the existing abort/assert gates in cstage check.c (strict
same-module lookup rather than scope_lookup_prefer, since lib/os.alloc
under a `use os;` import must not suppress the bare-alloc builtin in
client code). cgen.c shadows the resolution: only fire the rt_alloc
path when the typer left N_CALL.lhs->type == ty_err. wwstage gets a
new samemodfn helper for the matching gate.

Test fixtures: package-main repair for the 3 alloc rows in 700_e2e.c
that the parser was inheriting curmod="os" from the concat'd os.ww;
new shadow-test row asserts a same-module `fn alloc(n: i64) i64`
beats the builtin in cgen.
This commit is contained in:
Hojun-Cho
2026-05-19 18:51:07 +09:00
parent 58e6d349a2
commit 3fe968c8a0
7 changed files with 148 additions and 18 deletions
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11
cmd/w6c/cgen.c
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@@ -4122,10 +4122,15 @@ cgexpr(Cg *c, Node *n, Local *locals)
}
break;
}
if (n->lhs && n->lhs->kind == N_IDENT && n->lhs->str &&
strcmp(n->lhs->str, "alloc") == 0 && n->list) {
if (n->lhs && n->lhs->kind == N_IDENT &&
n->lhs->type == ty_err &&
n->lhs->str && strcmp(n->lhs->str, "alloc") == 0 &&
n->list) {
/* alloc(value): heap-init a fresh *T with the value's
* bytes. Size comes from the value's static type. */
* bytes. Size comes from the value's static type.
* `n->lhs->type == ty_err` gate (mirrors assert above)
* — check.c only stamps ty_err when no user-scoped
* `alloc` shadows the builtin (task #23). */
Node *v = n->list;
Type *t = v->type;
Type *u = (t && t->kind == TY_NAMED) ? t->under : t;