exp_aggr.adb (Build_Record_Aggr_Code): Extend the test for an ancestor part given by an aggregate to test for an...

2007-08-16  Gary Dismukes  <dismukes@adacore.com>
	    Ed Schonberg  <schonberg@adacore.com>
	    Javier Miranda  <miranda@adacore.com>

	* exp_aggr.adb (Build_Record_Aggr_Code): Extend the test for an
	ancestor part given by an aggregate to test for an unchecked conversion,
	since this can occur in some cases when the ancestor part is a function
	call, and we don't want to fall into the recursive call to this
	procedure in that case.

	* exp_ch3.adb (Stream_Operation_OK): Revise tests for availability of
	stream attributes on limited types to account for user-specified
	attributes as well as whether Input (resp. Output) becomes available
	due to Read (resp. Write) being available for the type. Change Boolean
	variable to the more accurate name
	Has_Predefined_Or_Specified_Stream_Attribute. Change convoluted
	double-"not" predicate at beginning of return statement to more
	understandable form.

	* exp_ch5.adb (Expand_N_Extended_Return_Statement): If the extended
	return has an associated N_Handled_Sequence_Of_Statements, then wrap it
	in a block statement and use that as the first statement of the
	expanded return rather than incorrectly using the handled sequence as
	the first statement.

	* exp_ch6.adb (Expand_N_Subprogram_Declaration): If this is a protected
	operation, generate an explicit freeze node for it rather than
	generating extra formals, to ensure that gigi has the proper order of
	elaboration for anonymous subtypes in the signature of the subprograms.
	(Build_In_Place_Formal): Move assertion to beginning of loop.
	(Is_Build_In_Place_Function_Call): Allow for an unchecked conversion
	applied to a function call (occurs for some cases of 'Input).
	(Make_Build_In_Place_Call_In_*): Allow for an unchecked conversion
	applied to a function call (occurs for some cases of 'Input).

	* exp_strm.adb (Build_Record_Or_Elementary_Input_Function): For Ada
	2005, generate an extended return statement enclosing the result object
	and 'Read call.

	* freeze.adb (Freeze_Record_Type): Extend the current management of
	components that are access type with an allocator as default value: add
	missing support to the use of qualified expressions of the
	allocator (which also cause freezing of the designated type!)
	(Freeze_Entity): Call Freeze_Subprogram in the case of a predefined
	dispatching operation, since extra formals may be needed by calls to
	build-in-place functions (such as stream 'Input).

	* sem_ch6.adb (Create_Extra_Formals): Skip creation of the extra
	formals for 'Constrained and accessibility level in the case of a
	predefined dispatching operation.

	* exp_util.adb (Insert_Actions): A protected body is a valid insertion
	point, no need to find the parent node.

From-SVN: r127538