Hojun-Cho
0d1ae17dd0
check: def rhs const-fold resolves sibling/imported defs + casts ( #88 )
...
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.
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