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wcc/cgen: #124 cross-module &fn in a const — N_DOT reloc + checker accept (both-stage)

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A cross-module `&module.fn` in a const emitted no static reloc (the
const was never defined -> w6l undefined-reference, both stages) and
wwstage's checker rejected the const fn-table. #117/#119 wired the
&fn->DATAR const-data reloc for SAME-module &fn only; charclass_map
(fold-6) needs cross-module (12x &ascii.isXXX).

cgen: add the N_DOT arm to the &fn->symbol helper (node_fnptr_sym /
nodefnptr + the two ww emit sites), emitting mafn(leaf, module-ident)
-- exactly the symbol a runtime &mod.fn or a direct cross-module call
already emits. The helper is the SSoT for both the scalar (#119) and
tuple-row (#117) const-data paths, so one arm closes both.

checker: type a cross-module `&mod.fn` as `*fn(...)` in the TK_AMP arm
(the N_DOT twin of #206's N_IDENT fn-ptr synthesis, gated on a resolved
SK_FN/N_FNDECL leaf), so isassignable affirmatively accepts the const
table -- aligning wwstage UP to cstage's actual acceptance reason
rather than by abdication. The SK_FN gate keeps a non-fn `&mod.var`
from synthesizing a fn type (the one pre-existing nonfn-scalar cs!=ww
slip is N_IDENT-base, untouched and reproduces same-module).

One consumer-coupled commit (the checker accept gates wwstage cgen, so
neither half is independently testable). Narrow: slice-row + scalar
only; fixed-array (#118) and struct-field (#129) stay separate. Both
stages emit the correct cross-module symbols at the right tuple-slot
offsets -> byte-identical (990-997 green). Pin 949_xmod_fnptr_const_run
(distinct fns so a wrong reloc is caught + the SK_FN-gate axis). This
was the last fold-6 cgen blocker; charclass_map is now unblocked.
This commit is contained in:
Hojun-Cho
2026-06-06 23:34:46 +09:00
parent 754944a755
commit 66d69537a5
7 changed files with 513 additions and 6 deletions
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7
Makefile
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@@ -327,6 +327,7 @@ TESTS = $(BIN)/test_smoke $(BIN)/test_lex $(BIN)/test_parse $(BIN)/test_check \
$(BIN)/test_nonlit_tuple_widen_run \
$(BIN)/test_const_slice_aggregate_run \
$(BIN)/test_tuple_index_read_run \
$(BIN)/test_xmod_fnptr_const_run \
$(BIN)/test_tuple_slot_layout_run \
$(BIN)/test_tagged_tuple_widen_run \
$(BIN)/test_tagged_structlit_payload_run \
@@ -1643,6 +1644,12 @@ $(BIN)/test_tuple_index_read_run: test/wcc/947_tuple_index_read_run.c \
$(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_xmod_fnptr_const_run: test/wcc/949_xmod_fnptr_const_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_tuple_widen_run: test/wcc/936_tagged_tuple_widen_run.c \
$(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
$(BIN)/ww_ww $(BIN)/w6c_ww $(BIN)/w6a_ww $(BIN)/w6l_ww \