Hojun-Cho
c34a48a81f
wcc+w6c_ww: append() struct-element sources via split place-resolve ( #49 )
...
#49 (#35 's single-element sibling, tranche-C pre-check PC2): the
struct-element append arm dispatched on SOURCE node kind — N_STRUCTLIT
(literal fill) and N_IDENT (local word-copy) only; every
place-resolvable chain died on the rule-7 fatal in BOTH stages,
including search()'s result-build line
`append(res, threads[best_idx].root_capture)` (regex.ha:819).
Wire those shapes with a SPLIT resolve around the grow (the #49
ruling): the chain's rvalues — deref-root pointer expr, index expr —
evaluate exactly once PRE-grow into @appendsroot/@appendsoff (an index
reading the slice header sees the pre-append len, Hare's argument
order), then only the BASE re-derives POST-grow from the live storage
and the stashed offsets land back on top, so a self-append source
re-roots in the post-realloc buffer. harec resolves an aggregate
source address wholly PRE-grow (gen.c: gen_load returns the address
for STORAGE_STRUCT, gen_store copies after rt.ensure) — a
use-after-free under a reclaiming allocator; per #263 we align to the
runtime-correct side, not the reference. A pointer ALIASING the grown
buffer keeps Hare's own stale-base hole (sound today only because
rt/malloc.ww never reclaims). Supported shapes are bounded: root
(local/global ident | deref) + at most one index + trailing direct
fields; all else stays on the #34 fatal, including CALL rvalues (the
#42-style bound, new reject row pins the text in both stages). The
N_STRUCTLIT/N_IDENT fast-paths keep their emission byte-identical.
806_append_place grows eight rows: indexed-field 56B capture (the
ha:819 shape, header readback), computed-index whole element,
deref-spine param pair, deref source, self-append ×33 crossing three
cap-doubling reallocs, the split-order semantics pin (a CALLED index
helper reading len must run once and see the PRE-grow len — the
pre-split emission failed exactly there), an element-kind ×
place-source matrix row (scalar/narrow/str/slice/tagged route via the
pre-existing arms — regression net), and the CALL-source reject. The
six fix rows verified FAILING against a pristine 796d41b build on
both drivers (loud #34 fatal, identically in cstage and w6c_ww —
there was no silent path at master); 70/70 fixtures green here
including per-row cs/ww asm byte-cmp.
Unblocks regex fold-2b tranche C (search) — PC2 was the lone
pre-check failure; PC1/PC3/PC4 passed at base.
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