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check: def rhs const-fold resolves sibling/imported defs + casts (#88)

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ww top-level def rhs const-fold was literal-only (fold_int_literal at the codegen emit-defs step), so a def referencing another def, an imported def, or a cast was inexpressible -- blocking faithful types/types::c/math/strconv ports whose defs cross-reference.

Fold at CHECK time: a recursive eval_def_const (pass-2 N_DEF arm, both stages) resolves N_IDENT/N_DOT via the checker's existing scope lookup to the target def's rhs, evaluates N_BIN through a shared fold_binop core (factored out of eval_enum_value so both compile-time-int-eval paths share one wrap/shift/divide table), strips identity/widening casts, and stamps rhs -> N_INTLIT. cgen is UNTOUCHED -- its existing literal-emit lays the DATA row. Gated to fire only when the plain literal fold fails, so existing defs keep their node and emitted asm is byte-identical (990-997 unperturbed by construction).

Guards (rule 7): recursion depth cap fails loud on a def cycle (same/cross-module); a narrowing cast (rhs outside target range) fails loud rather than silently truncating. Both stages' eval_def_const stamp identically (shared fold_binop semantics) so the substituted literal -- and byte-id -- holds across stages (rule 10, at the check pass).

a1 (same-module) + a2 (cross-module imported def) land together: the driver concatenates imports into one flat scope. Coverage: test/wcc/732_def_const_fold.
This commit is contained in:
Hojun-Cho
2026-05-25 11:16:08 +09:00
parent b7e1ad1a4b
commit 0d1ae17dd0
6 changed files with 1173 additions and 74 deletions
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Makefile
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@@ -217,6 +217,7 @@ TESTS = $(BIN)/test_smoke $(BIN)/test_lex $(BIN)/test_parse $(BIN)/test_check \
$(BIN)/test_arch \
$(BIN)/test_e2e $(BIN)/test_ffi $(BIN)/test_dyn $(BIN)/test_stdlib \
$(BIN)/test_at_test $(BIN)/test_let_global $(BIN)/test_def_neg_global \
$(BIN)/test_def_const_fold \
$(BIN)/test_int_cast_signed $(BIN)/test_dot_chain \
$(BIN)/test_amp_dot $(BIN)/test_arr_elem_field \
$(BIN)/test_arr_elem_field_write \
@@ -390,6 +391,12 @@ $(BIN)/test_def_neg_global: test/wcc/631_def_neg_global.c $(BIN)/ww \
$(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_def_const_fold: test/wcc/732_def_const_fold.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_int_cast_signed: test/wcc/640_int_cast_signed.c $(BIN)/ww \
$(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
$(BIN)/ww_ww $(BIN)/w6c_ww $(BIN)/w6a_ww $(BIN)/w6l_ww \