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wcc/check: #9 reject explicit [N]=[init] over-fill incl [0] (both stages)

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An explicit [N]T = [init] with more initializers than N silently
mis-compiled for N==0: the over-fill length-mismatch check was suppressed
when alen==0, because alen==0 doubles as the [_] infer-sentinel after
resolve_type collapses the two. So def/let [0]int=[1,2] silently resized
(cstage exit 2) or OOB-read/segfaulted (wwstage) instead of the loud
length-mismatch that [N]=[init>N] gets everywhere else.

The AST keeps the distinction the Type loses: [_] leaves the N_TARRAY
length-child NULL, an explicit [N] carries N_INTLIT. cstage adds an
is_infer_arr() helper, drops the alen>0 exemption at the over-fill check,
and gates the 4 infer-resize/no-init sites on is_infer_arr so an explicit
[0] flows to the over-fill -> loud. wwstage flips the one shared count
gate (checkarrlitfits) from declen>0 to arrtn.rhs!=nil, which also
dissolves a wwstage local-resize/module-OOB inconsistency.

[_] inference, [0]=[] empty, and [_]-no-init louding all preserved.
Under-long (count<N) stays out of scope (#10). byte-id 990-997 8/8.
test/wcc/820 table-driven; its one empty-[0] global row carves out
byte-id (pre-existing spurious-DATAW divergence, task #15).
This commit is contained in:
Hojun-Cho
2026-06-08 19:54:29 +09:00
parent 1aaa0a3670
commit 29a2ab2a72
6 changed files with 386 additions and 14 deletions
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7
Makefile
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@@ -248,6 +248,7 @@ TESTS = $(BIN)/test_smoke $(BIN)/test_lex $(BIN)/test_parse $(BIN)/test_check \
$(BIN)/test_def_arr_infer_len \
$(BIN)/test_def_arr_len \
$(BIN)/test_def_str_table \
$(BIN)/test_arr_zero_vs_infer \
$(BIN)/test_slice_str_global_zero \
$(BIN)/test_slice_literal_global \
$(BIN)/test_global_arr_elem_field \
@@ -668,6 +669,12 @@ $(BIN)/test_def_str_table: test/wcc/819_def_str_table.c $(BIN)/ww \
$(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_arr_zero_vs_infer: test/wcc/820_arr_zero_vs_infer.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_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 \