Hojun-Cho
0055ac2cd3
The N_FORRANGE header's non-ident arm stored cgexpr's AX into the
single bound temp — but a slice-valued cgexpr leaves AX=ptr, BX=len,
CX=cap, so the loop compared i against the DATA POINTER; and the
per-iteration element address had no non-ident base arm at all, so
the bound reload doubled as the base. One slot, two roles, holding
the wrong word. An empty slice coincidentally exited (ptr==0), which
is how regex.finish's `for (let charset .. re.charsets)` — planted
verbatim in fold 1 — stayed latent until fold 4 produced the first
non-empty charsets and SEGV'd. Byte-id both stages (the 989 M_ID
entry held on both-wrong-identical); first-consumer surfacing, the
kwtab/#8 pattern.
Fix mirrors the correct local-base arm: bound = BX (len), base ptr
spilled to a dedicated .rgb slot and reloaded per iteration. Covers
field-chain, indexed-element (the task-#57 shape) and call-result
bases. Two shapes whose cgexpr does NOT deliver the header convention
stay LOUD instead of silently wrong (rule 7): deref bases (*p — the
#11 deref-spine family) and non-ident ARRAY bases.
test/937: field (value+ptr roots), 24B-str-header field (the finish
shape), indexed, call, empty-header, eval-once (header captured at
loop entry, not re-read per iteration) rows + the two reject pins,
per-row cs==ww byte-id; verified failing 14/22 at the #66 parent
bb8a44a.
87 KiB
87 KiB