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sema: replace zirStructInitEmptyResult HACK with proper implementation

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Port zirStructInitEmptyResult from Sema.zig: resolve the type operand,
handle untyped empty init (return empty_tuple), and for struct types
create an empty aggregate value via ipForceIntern. This replaces the
VOID_VALUE hack that was masking the missing implementation.

No test count change (num_passing=105) — the proper implementation
produces the same results for the callconv(.c) void payload struct.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Motiejus Jakštys
2026-03-09 05:04:42 +00:00
parent ec13f0409e
commit f3c1c0e00c
1 changed files with 27 additions and 10 deletions
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37
stage0/sema.c
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@@ -11609,19 +11609,36 @@ static void zirValidatePtrStructInit(Sema* sema, uint32_t inst) {
}
// --- zirStructInitEmptyResult ---
// Ported from Sema.zig zirStructInitEmptyResult.
// For comptime union field init, this initializes the struct field with
// defaults. Currently a no-op since the actual values are created by
// validatePtrStructInit.
// Ported from Sema.zig zirStructInitEmptyResult (non-byref case).
// Creates an empty struct/array instance with default field values.
static AirInstRef zirStructInitEmptyResult(
Sema* sema, SemaBlock* block, uint32_t inst) {
(void)sema;
(void)block;
(void)inst;
// HACK: return VOID_VALUE in comptime context to allow body
// evaluation to continue. Proper implementation needs default
// field value resolution from struct ZIR.
return AIR_REF_FROM_IP(IP_INDEX_VOID_VALUE);
ZirInstRef operand = sema->code.inst_datas[inst].un_node.operand;
AirInstRef resolved = resolveInst(sema, operand);
// Untyped empty init: return empty_tuple.
// Ported from Sema.zig: generic poison → .empty_tuple.
if (!AIR_REF_IS_IP(resolved))
return AIR_REF_FROM_IP(IP_INDEX_EMPTY_TUPLE);
InternPoolIndex ty_ip = AIR_REF_TO_IP(resolved);
if (ty_ip >= sema->ip->items_len)
return AIR_REF_FROM_IP(IP_INDEX_EMPTY_TUPLE);
// For struct types: create an empty aggregate (all default values).
// Ported from Sema.zig structInitEmpty → finishStructInit.
if (sema->ip->items[ty_ip].tag == IP_KEY_STRUCT_TYPE) {
InternPoolKey key;
memset(&key, 0, sizeof(key));
key.tag = IP_KEY_AGGREGATE;
key.data.aggregate = ty_ip;
InternPoolIndex agg = ipForceIntern(sema->ip, key);
return AIR_REF_FROM_IP(agg);
}
SEMA_FAIL("zirStructInitEmptyResult: unsupported type");
return AIR_REF_FROM_IP(IP_INDEX_VOID_VALUE); // unreachable
}
// --- zirRetPtr ---