Hojun-Cho
6bcb0929f8
w6c+wwstage: tagged-element indexed store via dotbaseaddr + align dotchainaddr guard (#259,#256)
...
#259 : the tagged-union array-field indexed STORE arm computed &arr[i]
from a non-ident base (`x.o[1]=v` where o:[N](T|void)) with a plain
cgexpr(base) — the N_DOT array field auto-derefs (loads the field's
first 8 bytes AS a pointer) -> garbage dest -> SEGFAULT. Route the base
through the array-gated helper cg_dotbase_addr/dotbaseaddr (dst BX keeps
the scaled index live in AX; viaptr + chained handled by the shared
helper), mirroring #257 . Symmetric both stages. This was the last
unrouted cgexpr(base) cell in the array-field-base-address family
(#135/#252/#253/#255/#257) — proof-grep of both stages now shows ZERO
unrouted base cells in the slice/decay/addr/index/store builders, so the
family is closed by construction. (The chained-ptr-field scalar/str/
float store sites at cgenexpr.ww:6489+ / cgen.c:4379+ correctly cgexpr
the pointer spine and are the #133 family, not array-field-address.)
#256 : align wwstage dotchainaddr's N_IDENT non-local arm to carry
cstage cg_dotchain_addr's `let_islet || def_isstructdef` guard (here
isletvar || deflookup) instead of emitting LEAQ name(SB) unconditionally.
Unreachable on valid input (a struct-typed chain root is always local /
let-global / struct def) so zero divergent asm — never-silent ethos only.
Tests (949): store-only byte-id rows (tagged_store_own/_ptr) gate the
#259 store base-address emission cs==ww; store+readback rows
(tagged_store_*_rd) are run-only (cstage) proving the store wrote the
right slot (66/77) and no longer segfaults. byte-id on the readback rows
is blocked by an ORTHOGONAL newly-surfaced divergence in the N_DOT-base
tagged-element READ materialization (sibling of #255 : wwstage loads one
word + zeroes the tag where cstage copies the full 16-byte slot) — the
store base is already byte-id; only the read-back diverges. Reported
separately for triage.
combined.ww regen'd (w6c + wwdump embed cgen).
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