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wcc: reject module-scope alloc/call let initializers at check time

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A module-scope let whose rhs runs code (alloc, call — peeled through
cast/?/! wrappers) emitted no DATAW slot: emit_lets' fold-fail
silently skipped the definition and every reference died at LINK
time with 'undefined reference', the one unacceptable failure mode
(rule 7). Hare's model rejects at check time (ref/harec/src/
check.c:4360 'Unable to evaluate initializer at compile time') and
routes runtime init through @init, which ww does not have — so both
frontends now reject at the declaration with identical wording.

alias_infptr_global flips compile->error as the alloc pin (its
letvartnode N_TPTR-over-N_TSTRUCT coverage lives on in the local
alias_infptr_{nest,slicecap} siblings); callinit_global_reject pins
the call shape. Corpus pin 1741/345/21/209/1166/3482.
This commit is contained in:
Hojun-Cho
2026-08-08 19:15:10 +09:00
parent 84206ff4ed
commit b52f30a894
5 changed files with 65 additions and 9 deletions
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20
cmd/wcc/check.c
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@@ -3126,6 +3126,26 @@ check_file(Checker *c, Node *file)
if (t)
require_sized(c, t, d->pos, "a variable");
d->type = t;
/* A module-scope initializer must be link-time data:
* an alloc/call rhs runs code, emit_lets' fold-fail
* skipped the DATAW slot silently, and every
* reference died at LINK time ("undefined reference")
* — reject at the declaration instead (rule 7).
* Hare rejects at check time too (ref/harec/src/
* check.c:4360 "Unable to evaluate initializer at
* compile time"); ww has no @init path. */
{
Node *r = d->rhs;
while (r != NULL && (r->kind == N_CAST
|| r->kind == N_TRYPROP
|| r->kind == N_TRYUNW))
r = r->lhs;
if (r != NULL && (r->kind == N_ALLOC
|| r->kind == N_CALL))
err(c, d->pos, "module-scope let %s: "
"runtime initializer unsupported "
"(alloc/call; rule 7)", d->str);
}
if (d->str && d->str[0]) {
Sym *prev = scope_lookup_local(c->cur, d->str);
const char *mod = decl_mod(file, d);