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ww+wcc: Hare-strict enum types — back out the int↔enum relaxation

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Cascades the four enum kinds through every signature and local that
holds one of their values, then removes the type_assignable /
unify_arith relaxation that previously let bare i32 mix with the
named enum types.

Signature updates:
  - kwlookup() now returns `tkind` (not i32); tokname() takes `tkind`
  - accepttok / expecttok / bprec / isassignop take `tkind`
  - parsearglist's closekind is `tkind`
  - newtype / prim take `tykind`; scopedefine takes `skind`
  - newnode / nkname take `nkind`

Struct fields:
  - tok.kind is `tkind`; parser.curkind is `tkind`
  - node.kind is `nkind`; node.op is `tkind`
  - tinfo.kind is `tykind`; sym.skind is `skind`

Locals holding kinds across lex/parse/check/cgen are now typed with
their enum, including sentinel patterns like `let lkind: nkind =
nkind.N_NONE; if (...) lkind = tn.kind;`.

The selfhost cgen had a load-width bug exposed by this: fieldsize()
fell back to 8 bytes for any TNAME that wasn't a struct or primitive.
For a tkind-typed field that gave `MOVQ (BX), AX` instead of `MOVL`,
diverging from the C cgen on tok.kind / parser.curkind / etc. Two
fixes:
  - fieldsize now consults the enum registry and returns the storage
    type's size (4 for `enum i32`)
  - collectenums runs before collectstructs in cgfile so the registry
    is populated when registerstruct asks for field sizes

All 22 tests stay green; 990/993/995 byte-identity probes pass with
the strict typing in place.
This commit is contained in:
Hojun-Cho
2026-05-12 05:04:33 +09:00
parent 3affe01705
commit 922877309b
17 changed files with 210 additions and 194 deletions
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15
cmd/wcc/type.c
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@@ -295,21 +295,6 @@ type_assignable(Type *dst, Type *src)
if (dst->kind == TY_NAMED && type_eq(dst->under, src)) return 1;
if (src->kind == TY_NAMED && type_eq(dst, src->under)) return 1;
/* Enum ↔ integer storage: bare i32 flows into a `tkind` slot and
* vice-versa as long as the storage type matches. Hare-strict
* would require an explicit cast, but the ww frontend's tkind /
* nkind enums have hundreds of `let k: i32 = expr` sites we'd
* otherwise have to migrate in lockstep — the relaxation is
* explicit and limited to int-typed enums. */
{
Type *du = (dst->kind == TY_NAMED) ? dst->under : dst;
Type *su = (src->kind == TY_NAMED) ? src->under : src;
if (du && du->kind == TY_ENUM && type_isint(src) &&
type_eq(du->sub, src)) return 1;
if (su && su->kind == TY_ENUM && type_isint(dst) &&
type_eq(dst, su->sub)) return 1;
}
/* Tuple-to-tuple: element-wise assignable. */
if (dst->kind == TY_TUPLE && src->kind == TY_TUPLE) {
Tparam *pa = dst->params, *pb = src->params;