Hojun-Cho 1e2f55aed8 lib: graduate bytes/strings find-funcs to (i32 | void) ...

Replaces the -1 sentinel return on indexbyte/byteindex/rbyteindex/
index with Hare's optional-shaped tagged union. Callers `match` on
the result and bind the index from the i32 variant.

Two cgen fixes were needed first:

1. resolve_type for N_TTAGGED rounded value payload up to an 8-byte
   multiple. (i32 | void) was sized 12 — tag (8) + payload (4) —
   which made the reg-passing ABI compute size/8 = 1 word and drop
   the value word.

2. The call-arg push path special-cased struct and slice args but
   not tagged-return calls. A nested `f(g())` where g returns a
   tagged union pushed only AX (tag); the matching pop loaded a
   stale DX/SI for the value. Now pushes AX/DX[/CX] in order so
   the pop side drains tag → arg-reg[0], value(s) → arg-reg[1..].

strings.contains rewritten to match on the new tagged result. No
other callers existed in lib/ — bufio/io still use their own
shapes.

2026-05-12 01:49:00 +09:00

2.7 KiB

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