gnat_rm.texi: Document new pragma and aspect.

2011-08-04  Yannick Moy  <moy@adacore.com>

	* gnat_rm.texi: Document new pragma and aspect.
	* aspects.adb, aspects.ads (Aspect_Id): new value Aspect_Test_Case
	(No_Duplicates_Allowed): new constant array defining whether duplicates
	aspects of each kind can appear on the same declaration.
	* einfo.adb, einfo.ads (Spec_PPC_List): replace field with Contract
	field, which points to a node holding the previous Spec_PPC_List.
	* exp_ch9.adb, sem_ch6.adb, sem_prag.adb: Reach to Spec_PPC_List
	through the indirection with Contract.
	* exp_util.adb (Insert_Actions): raise Program_Error on N_Contract node
	* par-prag.adb (Prag): do nothing on Test_Case pragma
	* sem.adb (Analyze): abort on N_Contract, on which Analyze should not
	be called directly.
	* sem_attr.adb (Analyze_Attribute): allow attribute 'Result in
	component Ensures of Test_Case.
	* sem_ch12.adb, sem_ch6.adb, sem_ch9.adb
	(Analyze_Generic_Subprogram_Declaration,
	Analyze_Subprogram_Instantiation,
	Analyze_Abstract_Subprogram_Declaration,
	Analyze_Subprogram_Body_Helper,
	Analyze_Subprogram_Specification, Analyze_Entry_Declaration):
	insert contract in subprogram node at point of definition
	* sem_ch13.adb
	(Aspect_Loop): do not raise error on duplicate Test_Case aspect
	(Analyze_Aspect_Specifications): analyze Test_Case aspect and create
	corresponding pragma
	(Check_Aspect_At_Freeze_Point): raise Program_Error on Test_Case aspect
	* sem_ch3.adb (Analyze_Declarations): insert analysis of test-cases,
	similar to the analysis of pre/post
	(Derive_Subprogram): insert contract in subprogram node at point of
	derivation.
	* sem_prag.adb, sem_prag.ads
	(Check_Arg_Is_String_Literal, Check_Identifier):
	new checking procedures to be called in treatment of pragmas
	(Check_Test_Case): new procedure to check that a Test_Case aspect or
	pragma is well-formed. This does not check currently that 'Result is
	used only in the Ensures component of a Test_Case.
	(Analyze_Pragma): add case for Test_Case
	(Analyze_TC_In_Decl_Part): pre-analyze the Requires and Ensures
	components of a Test_Case.
	(Preanalyze_TC_Args): new procedure to preanalyze the boolean
	expressions in the 3rd (and 4th if present) arguments of a Test_Case
	pragma, treated as spec expressions.
	(Sig_Flags): add value -1 for Test_Case.
	* sem_util.adb, sem_util.ads (Get_Ensures_From_Test_Case_Pragma,
	Get_Requires_From_Test_Case_Pragma): getters for both expression
	components of a Test_Case.
	* sinfo.adb, sinfo.ads (N_Contract): new kind of node used as
	indirection between an entry or [generic] subprogram entity and its
	pre/post + test-cases.
	(Spec_PPC_List, Spec_TC_List, Set_Spec_PPC_List, Set_Spec_TC_List):
	get/set for fields of an N_Contract node.
	* snames.ads-tmpl (Name_Test_Case, Name_Ensures, Name_Mode,
	Name_Normal, Name_Requires, Name_Robustness, Pragma_Test_Case): new
	names and pragma for Test_Case.
	* sprint.adb (Sprint_Node): raise Program_Error on N_Contract node

From-SVN: r177384