2011-08-30 Steve Baird <baird@adacore.com>

2011-08-30  Steve Baird  <baird@adacore.com>

	* sem_util.ads (Deepest_Type_Access_Level): New function; for the type
	of a saooaaat (i.e, a stand-alone object of an anonymous access type),
	returns the (static) accessibility level of the object. Otherwise, the
	same as Type_Access_Level.
	(Dynamic_Accessibility_Level): New function; given an expression which
	could occur as the rhs of an assignment to a saooaaat (i.e., an
	expression of an access-to-object type), return the new value for the
	saooaaat's associated Extra_Accessibility object.
	(Effective_Extra_Accessibility): New function; same as
	Einfo.Extra_Accessibility except that object renames are looked through.
	* sem_util.adb
	(Deepest_Type_Access_Level): New function; see sem_util.ads description.
	(Dynamic_Accessibility_Level): New function; see sem_util.ads
	description.
	(Effective_Extra_Accessibility): New function; see sem_util.ads
	description.
	* einfo.ads (Is_Local_Anonymous_Access): Update comments.
	(Extra_Accessibility): Update comments.
	(Init_Object_Size_Align): New procedure; same as Init_Size_Align
	except RM_Size field (which is only for types) is unaffected.
	* einfo.adb
	(Extra_Accessibility): Expand domain to allow objects, not just formals.
	(Set_Extra_Accessibility): Expand domain to allow objects, not just
	formals.
	(Init_Size): Add assertion that we are not trashing the
	Extra_Accessibility attribute of an object.
	(Init_Size_Align): Add assertion that we are not trashing the
	Extra_Accessibility attribute of an object.
	(Init_Object_Size_Align): New procedure; see einfo.ads description.
	* sem_ch3.adb (Find_Type_Of_Object): Set Is_Local_Anonymous_Access
	differently for the type of a (non-library-level) saooaaat depending
	whether Ada_Version < Ada_2012. This is the only point where Ada_Version
	is queried in this set of changes - everything else (in particular,
	setting of the Extra_Accessibility attribute in exp_ch3.adb) is
	driven off of the setting of the Is_Local_Anonymous_Access attribute.
	The special treatment of library-level saooaaats is an optimization,
	not required for correctnesss. This is based on the observation that the
	Ada2012 rules (static and dynamic) for saooaaats turn out to be
	equivalent to the Ada2005 rules in the case of a library-level saooaaat.
	* exp_ch3.adb
	(Expand_N_Object_Declaration): If Is_Local_Anonymous_Access is
	false for the type of a saooaaat, declare and initialize its
	accessibility level object and set the Extra_Accessibility attribute
	of the saooaaat to refer to this object.
	* checks.adb (Apply_Accessibility_Check): Add Ada 2012 saooaaat support.
	* exp_ch4.adb (Expand_N_In): Replace some Extra_Accessibility calls with
	calls to Effective_Extra_Accessibility in order to support
	renames of saooaaats.
	(Expand_N_Type_Conversion): Add new local function,
	Has_Extra_Accessibility, and call it when determining whether an
	accessibility check is needed.
	It returns True iff Present (Effective_Extra_Accessibility (Id)) would
	evaluate to True (without raising an exception).
	* exp_ch5.adb
	(Expand_N_Assignment_Statement): When assigning to an Ada2012
	saooaaat, update its associated Extra_Accessibility object (if
	it has one). This includes an accessibility check.
	* exp_ch6.adb (Add_Call_By_Copy_Code): When parameter copy-back updates
	a saooaaat, update its Extra_Accessibility object too (if it
	has one).
	(Expand_Call): Replace a couple of calls to Type_Access_Level
	with calls to Dynamic_Access_Level to handle cases where
	passing a literal (any literal) is incorrect.
	* sem_attr.adb (Resolve_Attribute): Handle the static accessibility
	checks associated with "Saooaat := Some_Object'Access;"; this must
	be rejected if Some_Object is declared in a more nested scope
	than Saooaat.
	* sem_ch5.adb (Analyze_Assignment): Force accessibility checking for an
	assignment to a saooaaat even if Is_Local_Anonymous_Access
	returns False for its type (indicating a 2012-style saooaaat).
	* sem_ch8.adb
	(Analyze_Object_Renaming): Replace a call to Init_Size_Align
	(which is only appropriate for objects, not types) with a call
	of Init_Object_Size_Align in order to avoid trashing the
	Extra_Accessibility attribute of a rename (the two attributes
	share storage).
	* sem_res.adb
	(Valid_Conversion) Replace six calls to Type_Access_Level with
	calls to Deepest_Type_Access_Level. This is a bit tricky. For an
	Ada2012 non-library-level saooaaat, the former returns library level
	while the latter returns the (static) accessibility level of the
	saooaaat. A type conversion to the anonymous type of a saooaaat
	can only occur as part of an assignment to the saooaaat, so we
	know that such a conversion must be in a lhs context, so Deepest
	yields the result that we need. If such a conversion could occur,
	say, as the operand of an equality operator, then this might not
	be right. Also add a test so that static accessibilty checks are
	performed for converting to a saooaaat's type even if
	Is_Local_Anonymous_Access yields False for the type.

2011-08-30  Javier Miranda  <miranda@adacore.com>

	* sem_disp.adb (Check_Dispatching_Operation): Complete condition that
	controls generation of a warning associated with late declaration of
	dispatching functions. Required to avoid generating spurious
	warnings.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@178299 138bc75d-0d04-0410-961f-82ee72b054a4