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wcc/check: #14 reject def-global scalar str index (silent segfault) (both stages)

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def S:str = "hi"; S[0] silently segfaulted: a def is a compile-time
constant, never materialized as DATA (unlike let), so indexing it emitted
an unbacked main.S(SB) reference -> cstage ran into frame garbage,
wwstage link-failed. str[i] itself is valid ww (a deliberate Go-like
str[i]->u8 byte-index that lib/strings compare/dup depend on), so the fix
is narrow: the N_INDEX TY_STR arm now rejects an index whose operand is a
bare SK_DEF scalar-str symbol, both stages -- 'cannot index a def-constant
str; bind it to a let'. INDEX-ONLY: len(S) and &S are already loud, and a
def's .len/.ptr field reads (the load-bearing w6l INTERP) are N_DOT, a
different arm, and stay valid.

A rule-9 WHY-comment records str[i]->u8 as a sanctioned divergence from
Hare's strings.toutf8. The full make-it-work fold (len(S)->2, S[0]->byte)
is deferred (#16). byte-id 990-997 8/8. test/wcc/821 table-driven.
This commit is contained in:
Hojun-Cho
2026-06-08 20:17:05 +09:00
parent 29a2ab2a72
commit 03fc7c7abe
6 changed files with 440 additions and 4 deletions
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7
Makefile
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@@ -249,6 +249,7 @@ TESTS = $(BIN)/test_smoke $(BIN)/test_lex $(BIN)/test_parse $(BIN)/test_check \
$(BIN)/test_def_arr_len \
$(BIN)/test_def_str_table \
$(BIN)/test_arr_zero_vs_infer \
$(BIN)/test_def_str_index_reject \
$(BIN)/test_slice_str_global_zero \
$(BIN)/test_slice_literal_global \
$(BIN)/test_global_arr_elem_field \
@@ -651,6 +652,12 @@ $(BIN)/test_arr_ptr_global: test/wcc/818_arr_ptr_global.c $(BIN)/ww \
$(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_def_str_index_reject: test/wcc/821_def_str_index_reject.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_def_arr_infer_len: test/wcc/814_def_arr_infer_len.c $(BIN)/ww \
$(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
$(BIN)/ww_ww $(BIN)/w6c_ww $(BIN)/w6a_ww $(BIN)/w6l_ww \