c++: Save 8 further bytes from lang_type allocationsHEADtrunkmaster

The following patch implements the
/* FIXME reuse another field?  */
comment on the lambda_expr member.
I think (and asserts in the patch seem to confirm) CLASSTYPE_KEY_METHOD
is only ever non-NULL for TYE_POLYMORPHIC_P and on the other side
CLASSTYPE_LAMBDA_EXPR is only used on closure types which are never
polymorphic.

So, the patch just uses one member for both, with the accessor macros
changed to be no longer lvalues and adding SET_* variants of the macros
for setters.

2025-07-11  Jakub Jelinek  <jakub@redhat.com>

	* cp-tree.h (struct lang_type): Add comment before key_method.
	Remove lambda_expr.
	(CLASSTYPE_KEY_METHOD): Give NULL_TREE if not TYPE_POLYMORPHIC_P.
	(SET_CLASSTYPE_KEY_METHOD): Define.
	(CLASSTYPE_LAMBDA_EXPR): Give NULL_TREE if TYPE_POLYMORPHIC_P.
	Use key_method member instead of lambda_expr.
	(SET_CLASSTYPE_LAMBDA_EXPR): Define.
	* class.cc (determine_key_method): Use SET_CLASSTYPE_KEY_METHOD
	macro.
	* decl.cc (xref_tag): Use SET_CLASSTYPE_LAMBDA_EXPR macro.
	* lambda.cc (begin_lambda_type): Likewise.
	* module.cc (trees_in::read_class_def): Use SET_CLASSTYPE_LAMBDA_EXPR
	and SET_CLASSTYPE_KEY_METHOD macros, assert lambda is NULL if
	TYPE_POLYMORPHIC_P and otherwise assert key_method is NULL.

0 files changed, 0 insertions, 0 deletions