Hojun-Cho fb62aa38f1 w6c+wwstage: emit global str/slice len via .len field load (#231) ...

len(str-or-slice-global) was wrong in both stages, differently. cstage's
len() arm did a BP-relative slot load; localfind returns 0 for a global,
so it emitted `MOVQ 8(BP),AX` — a bogus stack slot. wwstage's arm only
handled locals; a global fell through to cgexpr, which loads the whole
header and leaves AX=.ptr, not .len.

Both stages now emit the global .len load — LEAQ name(SB),CX; MOVQ
8(CX),AX (.len field; header is ptr@0/len@8/cap@16). The LEAQ symbol
routes through the post-#1 value mangle (cstage mahint c->cur_mod,
wwstage emitsymnamehint c.curmod), not a raw name, so a private
same-module same-leaf str global can't re-open the #1 collision.

The local-str case is unchanged (control). Slice-global rows wait on
#233 (cstage rejects `let g: []u8 = [...]` init); the str global proves
the path. Byte-id-blind, so a committed runtime + cs==ww test (797) is
the net.

2026-06-01 09:59:32 +09:00

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