Implement N3653 (Member initializers and aggregates) and fix references to 'this' in constexpr constructors. Implement N3653 (Member initializers and aggregates) and fix references to 'this' in constexpr constructors. * class.c (check_field_decls): In C++14 an NSDMI does not make the class non-aggregate. * constexpr.c (struct constexpr_ctx): New. (cxx_bind_parameters_in_call): Handle 'this'. (cxx_eval_call_expression): Create new constexpr_ctx. (cxx_eval_component_reference): Check CONSTRUCTOR_NO_IMPLICIT_ZERO. (initialized_type, init_subob_ctx, verify_ctor_sanity): New. (cxx_eval_bare_aggregate): Use them. Build CONSTRUCTOR early. (cxx_eval_vec_init_1): Likewise. (cxx_eval_constant_expression) [PARM_DECL]: Allow 'this'. [TARGET_EXPR]: Build new constexpr_ctx. [PLACEHOLDER_EXPR]: New. (cxx_eval_outermost_constant_expr): Build new constexpr_ctx. Add object parameter. (is_sub_constant_expr): Build new constexpr_ctx. (potential_constant_expression_1): Handle PLACEHOLDER_EXPR. Allow 'this'. * cp-gimplify.c (cp_gimplify_init_expr): Call replace_placeholders. * cp-tree.h (CONSTRUCTOR_NO_IMPLICIT_ZERO): New. * error.c (dump_expr): Handle PLACEHOLDER_EXPR. * init.c (get_nsdmi): Generate PLACEHOLDER_EXPR. * tree.c (lvalue_kind): Handle PLACEHOLDER_EXPR. (build_ctor_subob_ref, replace_placeholders): New. * typeck2.c (store_init_value): Use replace_placeholders. (process_init_constructor_record): Make zero-init before NSDMI explicit. From-SVN: r216750
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