Hojun-Cho
754944a755
wcc/cgen: #121 indexed tuple-element read + literal-store round-trip (both-stage)
...
Reading or storing a tuple element of an indexed array element was
broken across the board (the fold-6 read-path). One fused commit,
both stages, four faces of indexed tuple-element access:
- FIELD read `tbl[i].N`: was loud ("unsupported field-read shape" --
the field-read dispatch keyed on an N_IDENT base; an INDEX base fell
to a fatal). Now resolves &tbl[i] via the place-spine and reads the
field at addr+foff through the existing per-kind arms (str-triple /
scalar / fn-ptr).
- WHOLE read `let e = tbl[i]`: was a silent word0-only truncation
(plain-tuple kin of #37/#58, which covered only tagged). Now a full
cursor fill from &tbl[i].
- STORE `a[i] = (3,4)` (N_TUPLE-literal rhs): was a silent word0-only
store -- the write face of the read. The aggregate-store-into-index
site handled ident/dot/deref tuple rhs but not the literal; now it
materializes the literal and word-copies. Narrow: N_IDENT base only
(N_DOT/chained stay deferred, #270 ).
- for-range over a const-slice-of-tuple: was a divergent SEGV; now a
symmetric loud-stop on both stages (filed #122 ).
The store and read were a round-trip that passed test 809 only by luck
(broken store XOR broken read canceled). Fixing the read alone exposed
the silent store; rule-7 obliges fixing both, so 809 is now genuinely
correct, not luck-correct. Both faces are byte-id-blind (#263 ) -- the
net is a runtime round-trip pin with distinct-per-word values and a
real call clobbering the cursor registers between store and read, so a
word0-only store or read is caught. Both stages byte-identical
(990-997 green). Pin 947_tuple_index_read_run.
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