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wcc/cgen: #140 !void error-singleton variant as value — skip absent void payload load, emit tag-only (cstage, align up)

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A void (size-0) error-singleton type-name used as a VALUE (return / let-init /
assign / call-arg) all share the N_IDENT non-local global-value load; the load
emitted MOVQ main.<singleton>(SB),AX for a payload symbol that never exists →
w6l undefined reference. Guard TY_VOID && !let && !def at the non-local
fallthrough so nothing is emitted; the enclosing widen arm stamps the variant
tag. wwstage was already tag-only correct — this aligns cstage up to it.

Pin test/wcc/949_void_error_singleton_run.c (6 rows, teeth = link-fail
pre-fix). cgen-first blocker for the path::buffer arc (error.ha is all !void).
This commit is contained in:
Hojun-Cho
2026-06-08 00:18:26 +09:00
parent d0a1e2a221
commit 620e733444
3 changed files with 320 additions and 0 deletions
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7
Makefile
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@@ -280,6 +280,7 @@ TESTS = $(BIN)/test_smoke $(BIN)/test_lex $(BIN)/test_parse $(BIN)/test_check \
$(BIN)/test_sret_struct_return \
$(BIN)/test_sret_struct_return_run \
$(BIN)/test_tagged_sret_run \
$(BIN)/test_void_error_singleton_run \
$(BIN)/test_tagged_memarg_run \
$(BIN)/test_tagscr_sizes_run \
$(BIN)/test_is_nonident_run \
@@ -1346,6 +1347,12 @@ $(BIN)/test_tagged_sret_run: test/wcc/926_tagged_sret_run.c \
$(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_void_error_singleton_run: test/wcc/949_void_error_singleton_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_tagged_memarg_run: test/wcc/929_tagged_memarg_run.c \
$(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
$(BIN)/ww_ww $(BIN)/w6c_ww $(BIN)/w6a_ww $(BIN)/w6l_ww \