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parse,check,type,wwi: @packed struct attribute, both stages (#51)

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Hare/harec @packed struct layout: no inter-field or trailing padding, align =
max field align (NOT forced to 1) — matches harec type_store.c + types.c:621
(packed{u8,u64}=size 9/align 8). Parser consumes inline @packed (loud-rejects
unknown struct attrs, both stages); layout gates padding on !packed; cstage
type_eq enforces packed type-distinctness; the .wwi producer round-trips
"struct @packed {". wwstage sets slotsize=size for packed so its composite-ABI
copy matches cstage byte-for-byte. cstage identity is faithful; wwstage identity
rides the deferred #224 nominal-resolvealias arc (#108). Both stages byte-id;
447 tests pass.
This commit is contained in:
Hojun-Cho
2026-06-19 00:17:49 +09:00
parent 0197dfb9e6
commit 027f90c572
12 changed files with 563 additions and 16 deletions
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12
cmd/wcc/check.c
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@@ -935,7 +935,11 @@ resolve_type(Checker *c, Node *n)
if (!require_sized(c, ft, f->pos, "a struct field"))
continue;
if (ft->align > maxalign) maxalign = ft->align;
off = (off + ft->align - 1) & ~(ft->align - 1);
/* packed: no inter-field padding (harec
* type_store.c:206-213); align still tracks the
* max field align below. */
if (!n->packed)
off = (off + ft->align - 1) & ~(ft->align - 1);
if (f->str != NULL) {
/* regular named field */
for (Tfield *e = head; e; e = e->next)
@@ -985,8 +989,12 @@ resolve_type(Checker *c, Node *n)
off = base + inner->size;
}
t->fields = head;
t->packed = n->packed;
t->align = maxalign;
t->size = (off + maxalign - 1) & ~(maxalign - 1);
/* packed: skip the trailing pad-to-align (harec
* type_store.c:886 `!packed`); align value unchanged. */
t->size = n->packed ? off
: ((off + maxalign - 1) & ~(maxalign - 1));
return t;
}
case N_TENUM: {