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w6c+w6c_ww: box [N]tagged array-literal elements via the tagged-store path (fix #12)

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A [N]tagged-union array-literal element fell through the is_agg
multi-word-copy path (STRUCT/ARRAY/TUPLE/str/slice only) to the scalar
1-word store: the raw value landed in word 0 (the tag slot) with no tag
written and no payload boxed, so a later match found no variant. Both
stages under-copied identically, so the copy-depth bug was byte-id-blind
— a stride-only fix would still store 1 word and pass the gate green on
both-wrong.

Route each tagged element through cg_widen_tagged_store / the N_LET "BP"
tagged-store wrapper — the same choke-point let-init, vararg gather and
struct-field stores already use — so boxing, tag-remap and zero-pad-to-
slot come for free. esz now comes from the stamped slot size (rule-13);
the wwstage narrow override only covered widths 1/2/4, leaving a 16/24B
tagged element on the wrong 8-byte sentinel stride. rule-7 loud-stops
the unwired `[N]tagged=[x...]` repeat-fill (the widen call consumes the
node and trashes AX).

test/wcc/685: table-driven runtime readback (106/42/13) + a build-fail
row for the repeat-fill loud-stop, both stages.
This commit is contained in:
Hojun-Cho
2026-06-03 20:32:22 +09:00
parent 3f04ea15ef
commit 63142770de
6 changed files with 475 additions and 3 deletions
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7
Makefile
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@@ -241,6 +241,7 @@ TESTS = $(BIN)/test_smoke $(BIN)/test_lex $(BIN)/test_parse $(BIN)/test_check \
$(BIN)/test_arr_elem_field_write \
$(BIN)/test_arr_enum_elem \
$(BIN)/test_arr_strslice_elem \
$(BIN)/test_arr_tagged_elem \
$(BIN)/test_arr_infer_len \
$(BIN)/test_dot_str_chained_arg \
$(BIN)/test_dot_slice_arg \
@@ -568,6 +569,12 @@ $(BIN)/test_arr_infer_len: test/wcc/684_arr_infer_len.c $(BIN)/ww \
$(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_arr_tagged_elem: test/wcc/685_arr_tagged_elem.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_dot_str_chained_arg: test/wcc/692_dot_str_chained_arg.c $(BIN)/ww \
$(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
$(BIN)/ww_ww $(BIN)/w6c_ww $(BIN)/w6a_ww $(BIN)/w6l_ww \