sem_ch3.adb (Process_Subtype): An allocator is a valid construct that can carry…

sem_ch3.adb (Process_Subtype): An allocator is a valid construct that can carry a null exclusion indicator...

2008-08-05  Ed Schonberg  <schonberg@adacore.com>

	* sem_ch3.adb (Process_Subtype): An allocator is a valid construct that
	can carry a null exclusion indicator, and on which an error may be
	posted if the indicator is redundant.

	* sem_ch8.adb (Analyze_Object_Renaming): Verify that a null exclusion
	does not apply to a subtype mark that already excludes null.

	* sem_ch12.adb (Formal_Object_Declaration): Verify that a null
	exclusion does not apply to a subtype mark that already excludes null.

From-SVN: r138728

gcc/ada/ChangeLog

+2008-08-05  Ed Schonberg  <schonberg@adacore.com>
+
+	* freeze.adb:
+	(Freeze_Entity): A deferred constant does not violate the restriction
+	No_Default_Initialization, 
+
+	* sem_ch3.adb (Process_Subtype): An allocator is a valid construct that
+	can carry a null exclusion indicator, and on which an error may be
+	posted if the indicator is redundant.
+
+	* sem_ch8.adb (Analyze_Object_Renaming): Verify that a null exclusion
+	does not apply to a subtype mark that already excludes null.
+
+	* sem_ch12.adb (Formal_Object_Declaration): Verify that a null
+	exclusion does not apply to a subtype mark that already excludes null.
+
+2008-08-05  Thomas Quinot  <quinot@adacore.com>
+
+	* Makefile.rtl: Compile s-oscons.ads as part of the runtime library.
+
+2008-08-05  Doug Rupp  <rupp@adacore.com>
+
+	* vms_data.ads: Translation for /POINTER_SIZE qualifier.
+
 2008-08-05  Thomas Quinot  <quinot@adacore.com>
 
 	* gsocket.h: Make this file includable in a Nucleus environment, which

gcc/ada/sem_ch12.adb

@@ -1810,6 +1810,16 @@ package body Sem_Ch12 is
          Find_Type (Subtype_Mark (N));
          T := Entity (Subtype_Mark (N));
 
+         --  Verify that there is no redundant null exclusion.
+
+         if Null_Exclusion_Present (N)
+           and then Can_Never_Be_Null (T)
+         then
+            Error_Msg_NE
+              ("`NOT NULL` not allowed (& already excludes null)",
+                 N, T);
+         end if;
+
       --  Ada 2005 (AI-423): Formal object with an access definition
 
       else

gcc/ada/sem_ch3.adb

@@ -16507,7 +16507,9 @@ package body Sem_Ch3 is
              or else
            Nkind_In (P, N_Derived_Type_Definition,
                         N_Discriminant_Specification,
+                        N_Formal_Object_Declaration,
                         N_Object_Declaration,
+                        N_Object_Renaming_Declaration,
                         N_Parameter_Specification,
                         N_Subtype_Declaration);
 
@@ -16552,6 +16554,9 @@ package body Sem_Ch3 is
                      Error_Node :=
                        Subtype_Indication (Component_Definition (Related_Nod));
 
+                  when N_Allocator =>
+                     Error_Node := Expression (Related_Nod);
+
                   when others =>
                      pragma Assert (False);
                      Error_Node := Related_Nod;

gcc/ada/sem_ch8.adb

@@ -884,6 +884,11 @@ package body Sem_Ch8 is
                   Error_Msg_N
                     ("renamed object does not exclude `NULL` "
                      & "(RM 8.5.1(4.6/2))", N);
+
+               elsif Can_Never_Be_Null (Etype (Nam_Ent)) then
+                  Error_Msg_NE
+                    ("`NOT NULL` not allowed (type of& already excludes null)",
+                      N, Nam_Ent);
                end if;
             end if;
          end;