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wcc: add the opaque abstract type (kind + UNDEFINED sentinel + name-binding) (#108)

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#108 sub-fold (a): TY_OPAQUE exists, is name-bindable, and carries an
UNDEFINED size sentinel. Mirrors the #85 `size` fold pattern at every
site, both stages (rule-10).

opaque is abstract + UNSIZED: prim()'d with size=align=SIZE_UNDEFINED
(NOT 0 — a 0 would let a bare `let x: opaque` fabricate a 0-byte local),
mirroring harec builtin_type_opaque (ref/harec/src/types.c:1446). ww had
no incomplete-size sentinel, so this fold ADDS one: cstage
`#define SIZE_UNDEFINED ((u64)-1)` (== harec types.h:58 (size_t)-1) and
wwstage `def SIZE_UNDEFINED: u64 = 18446744073709551615`.

Legal only behind indirection: `*opaque` (8B ptr) and `[]opaque` (24B
slice header) construct correctly because type_ptr/type_slice (and the
wwstage typeptr/typeslice) size themselves independent of the element.
opaque is deliberately absent from is-int/unsigned/num/float and from
the size-classification switches (let_emit_size / tupleelemslot /
fieldslotsize) on both stages — it only reaches those as TY_PTR/TY_SLICE.

The use-restriction GUARDS (reject bare opaque / size(opaque) / opaque
field / [N]opaque / []opaque-indexing), assignability, and cgen-verify
are the separate sub-folds (b)/(c)/(d) — NOT here.

opaque is unused by the bootstrap, so 990-997 stay byte-identical
(inert, like #85). Regenerates the w6c/wwdump combined.ww (typ.ww +
check.ww embedded). New probe 960_opaque_decl_run exercises `*opaque`
and `[]opaque` (.len/.ptr) behind indirection.
This commit is contained in:
Hojun-Cho
2026-05-26 09:02:08 +09:00
parent d9cfb91cb9
commit 3a18d2cfe6
9 changed files with 209 additions and 1 deletions
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5
Makefile
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@@ -337,6 +337,7 @@ TESTS = $(BIN)/test_smoke $(BIN)/test_lex $(BIN)/test_parse $(BIN)/test_check \
$(BIN)/test_size_type_run \
$(BIN)/test_types_sizelim_run \
$(BIN)/test_types_intlim_run \
$(BIN)/test_opaque_decl_run \
$(BIN)/test_bufio_run $(BIN)/test_random_run
$(BIN)/test_smoke: test/wcc/000_smoke.c $(LIB)/libwcc.a | $(BIN)
@@ -1096,6 +1097,10 @@ $(BIN)/test_types_intlim_run: test/wcc/959_types_intlim_run.c $(BIN)/ww \
$(BIN)/w6c $(BIN)/w6a $(BIN)/w6l $(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_opaque_decl_run: test/wcc/960_opaque_decl_run.c $(BIN)/ww $(BIN)/w6c \
$(BIN)/w6a $(BIN)/w6l $(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_f64crossmod_run: test/wcc/953_f64crossmod_run.c $(BIN)/ww \
$(BIN)/w6c $(BIN)/w6c_ww $(BIN)/w6a $(BIN)/w6l \
$(LIB)/libwwrt.a | $(BIN)