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cgen: str a,s=call() N_MASSIGN tuple-elem store -> 3-word -- Phase 2 G3 (both stages)

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Reassign-destructuring a (scalar,str) tuple (a, s = call(), N_MASSIGN) stored only the str's ptr (DX->slot+0), dropping len/cap -- the last STORE-cluster gap. Reachable (valid ww; checker accepts str tuple elements) but unexercised in bootstrap (all N_MASSIGN sites returned <=8B tuples). Mirror the N_MLET destructure-store oracle (cgen.c:7475): on the one-str XOR, route the str's 3 words DX/CX/R8 -> slot+0/+8/+16; the slot pre-exists (localfind, not localadd). wwstage has no checker, so it derives str-ness from the callee return-type tuple via fnretlookupmod (structurally identical to cgmlet). Both XOR positions (str at l0 and l1). Kind-gated, never size==24. cstage==wwstage byte-identical.

Scope = one-str only, matching N_MLET exactly; str+str-both is unhandled by N_MLET too and is filed as a shared gap (task #22), with WHY-comments at both destructure sites. N_MLET emission unchanged (its edit is comment-only, verified byte-identical).

test/wcc/939: table-driven write-then-read-cap over both XOR positions (a,s=mk() and s,a=mk2()); cap!=len via mutation (not a sub-slice, #20); pre-poisoned via a non-G3 let-init; full triple+scalar asserted; fail-before/pass-after on both drivers. Completes the str-cap STORE cluster -- the read/write round-trip is now whole. main.combined.ww regenerated via the canonical make path.
This commit is contained in:
Hojun-Cho
2026-05-24 16:54:14 +09:00
parent b51a7daa25
commit 80527f3868
6 changed files with 559 additions and 8 deletions
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Makefile
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@@ -261,6 +261,7 @@ TESTS = $(BIN)/test_smoke $(BIN)/test_lex $(BIN)/test_parse $(BIN)/test_check \
$(BIN)/test_str_arrfield_cap_run \
$(BIN)/test_str_arrfield_store_cap_run \
$(BIN)/test_str_chainfield_store_cap_run \
$(BIN)/test_str_massign_store_cap_run \
$(BIN)/test_composite_call_arg \
$(BIN)/test_composite_call_arg_run \
$(BIN)/test_letdecl_zeroinit \
@@ -669,6 +670,12 @@ $(BIN)/test_str_chainfield_store_cap_run: test/wcc/938_str_chainfield_store_cap_
$(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_str_massign_store_cap_run: test/wcc/939_str_massign_store_cap_run.c \
$(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
$(BIN)/ww_ww $(BIN)/w6c_ww $(BIN)/w6a_ww $(BIN)/w6l_ww \
$(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_composite_call_arg: test/wcc/723_composite_call_arg.c \
$(BIN)/w6c $(BIN)/w6c_ww | $(BIN)
$(CC) $(CFLAGS) -o $@ $<