Hojun-Cho ae6a59a355 selfhost/cmd/wcc: peel TY_NAMED in 5 structural walkers (#63, Phase-N step 1) ...

Phase-N prerequisite (additive, byte-id unchanged). slotsize / fieldsize /
nullableptrtag (cgenutil) and tupleelemslot / fieldslotsize (check) read
size/slot/kind off a tinfo without peeling TY_NAMED. Once Phase-N step 2
(#64) makes tinfofornode build per-decl TY_NAMED wrappers, an unpeeled
reader would misbehave (fall through to 8 / take natural size not slot /
miss NAMED-of-tagged). Prepend a transitive `for (t != nil && t.kind ==
tykind.TY_NAMED) { t = t.under; }` peel + nil re-guard at each, mirroring
cstage's `while (t->kind == TY_NAMED) t = t->under` and the recursive
typeis* predicates.

Additive no-op today: tinfofornode still collapses aliases, so no NAMED is
ever built and the loop never executes. byte-id 990-997 unchanged (133/133).

Audit (worker + reviewer, independently, across all selfhost/cmd/wcc/*.ww
+ lib/ww/*.ww): these 5 are the ONLY non-peeling structural walkers. typeis*
recurse on .under; typeeq is nominal by design (ptr-identity, the step-3
goal); typeisuntyped cannot receive a NAMED; check.ww type constructors and
localloadop read only .size/.slotsize, which typenamed copies from .under so
they stay numerically correct on a NAMED without peeling.

2026-05-23 18:44:12 +09:00

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