diff options
Diffstat (limited to 'gcc/cp/method.cc')
| -rw-r--r-- | gcc/cp/method.cc | 37 |
1 files changed, 36 insertions, 1 deletions
diff --git a/gcc/cp/method.cc b/gcc/cp/method.cc index 092bae2..67a80a3 100644 --- a/gcc/cp/method.cc +++ b/gcc/cp/method.cc @@ -2251,6 +2251,8 @@ constructible_expr (tree to, tree from) const int len = TREE_VEC_LENGTH (from); if (CLASS_TYPE_P (to)) { + if (ABSTRACT_CLASS_TYPE_P (to)) + return error_mark_node; tree ctype = to; vec<tree, va_gc> *args = NULL; if (!TYPE_REF_P (to)) @@ -2330,6 +2332,37 @@ constructible_expr (tree to, tree from) return expr; } +/* Valid if "Either T is a reference type, or T is a complete object type for + which the expression declval<U&>().~U() is well-formed when treated as an + unevaluated operand ([expr.context]), where U is remove_all_extents_t<T>." + + For a class U, return the destructor call; otherwise return void_node if + valid or error_mark_node if not. */ + +static tree +destructible_expr (tree to) +{ + cp_unevaluated cp_uneval_guard; + int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR; + if (TYPE_REF_P (to)) + return void_node; + if (!COMPLETE_TYPE_P (complete_type (to))) + return error_mark_node; + to = strip_array_types (to); + if (CLASS_TYPE_P (to)) + { + to = build_trait_object (to); + return build_delete (input_location, TREE_TYPE (to), to, + sfk_complete_destructor, flags, 0, tf_none); + } + /* [expr.prim.id.dtor] If the id-expression names a pseudo-destructor, T + shall be a scalar type.... */ + else if (scalarish_type_p (to)) + return void_node; + else + return error_mark_node; +} + /* Returns a tree iff TO is assignable (if CODE is MODIFY_EXPR) or constructible (otherwise) from FROM, which is a single type for assignment or a list of types for construction. */ @@ -2339,13 +2372,15 @@ is_xible_helper (enum tree_code code, tree to, tree from, bool trivial) { to = complete_type (to); deferring_access_check_sentinel acs (dk_no_deferred); - if (VOID_TYPE_P (to) || ABSTRACT_CLASS_TYPE_P (to) + if (VOID_TYPE_P (to) || (from && FUNC_OR_METHOD_TYPE_P (from) && (TYPE_READONLY (from) || FUNCTION_REF_QUALIFIED (from)))) return error_mark_node; tree expr; if (code == MODIFY_EXPR) expr = assignable_expr (to, from); + else if (code == BIT_NOT_EXPR) + expr = destructible_expr (to); else if (trivial && TREE_VEC_LENGTH (from) > 1 && cxx_dialect < cxx20) return error_mark_node; // only 0- and 1-argument ctors can be trivial |