[multiple changes]

2015-05-28  Ed Schonberg  <schonberg@adacore.com>

	* sem_ch3.adb (Is_Visible_Component): Component is visible
	in a derived type if inherited through an ancestor that has a
	partial view of the original type holding the component, if the
	full view of that original type is in scope.
	* sem_util.ads (Get_Body_From_Stub): Works for all kinds of stubs.

2015-05-28  Bob Duff  <duff@adacore.com>

	* sem_util.adb (Requires_Transient_Scope): For definite untagged
	subtypes, we should never have to use the secondary stack. This moves
	toward that goal. But there are still cases that don't work.
	Here, we move the check for Is_Definite first, but add a
	special-purpose check for Has_Discrim_Dep_Array.

From-SVN: r223817

gcc/ada/ChangeLog

@@ -1,3 +1,19 @@
+2015-05-28  Ed Schonberg  <schonberg@adacore.com>
+
+	* sem_ch3.adb (Is_Visible_Component): Component is visible
+	in a derived type if inherited through an ancestor that has a
+	partial view of the original type holding the component, if the
+	full view of that original type is in scope.
+	* sem_util.ads (Get_Body_From_Stub): Works for all kinds of stubs.
+
+2015-05-28  Bob Duff  <duff@adacore.com>
+
+	* sem_util.adb (Requires_Transient_Scope): For definite untagged
+	subtypes, we should never have to use the secondary stack. This moves
+	toward that goal. But there are still cases that don't work.
+	Here, we move the check for Is_Definite first, but add a
+	special-purpose check for Has_Discrim_Dep_Array.
+
 2015-05-28  Bob Duff  <duff@adacore.com>
 
 	* sem_util.adb (Requires_Transient_Scope): Avoid returning

gcc/ada/sem_ch3.adb

@@ -17946,7 +17946,7 @@ package body Sem_Ch3 is
       N : Node_Id := Empty) return Boolean
    is
       Original_Comp  : Entity_Id := Empty;
-      Original_Scope : Entity_Id;
+      Original_Type : Entity_Id;
       Type_Scope     : Entity_Id;
 
       function Is_Local_Type (Typ : Entity_Id) return Boolean;
@@ -17990,13 +17990,13 @@ package body Sem_Ch3 is
          return False;
 
       else
-         Original_Scope := Scope (Original_Comp);
+         Original_Type := Scope (Original_Comp);
          Type_Scope     := Scope (Base_Type (Scope (C)));
       end if;
 
       --  This test only concerns tagged types
 
-      if not Is_Tagged_Type (Original_Scope) then
+      if not Is_Tagged_Type (Original_Type) then
          return True;
 
       --  If it is _Parent or _Tag, there is no visibility issue
@@ -18010,7 +18010,7 @@ package body Sem_Ch3 is
 
       elsif Ekind (Original_Comp) = E_Discriminant
         and then
-          (not Has_Unknown_Discriminants (Original_Scope)
+          (not Has_Unknown_Discriminants (Original_Type)
             or else (Present (N)
                       and then Nkind (N) = N_Selected_Component
                       and then Nkind (Prefix (N)) = N_Type_Conversion
@@ -18038,11 +18038,11 @@ package body Sem_Ch3 is
       --  visible. The latter suppression of visibility is needed for cases
       --  that are tested in B730006.
 
-      elsif Is_Private_Type (Original_Scope)
+      elsif Is_Private_Type (Original_Type)
         or else
           (not Is_Private_Descendant (Type_Scope)
             and then not In_Open_Scopes (Type_Scope)
-            and then Has_Private_Declaration (Original_Scope))
+            and then Has_Private_Declaration (Original_Type))
       then
          --  If the type derives from an entity in a formal package, there
          --  are no additional visible components.
@@ -18062,7 +18062,7 @@ package body Sem_Ch3 is
          else
             return
               Is_Child_Unit (Cunit_Entity (Current_Sem_Unit))
-                and then In_Open_Scopes (Scope (Original_Scope))
+                and then In_Open_Scopes (Scope (Original_Type))
                 and then Is_Local_Type (Type_Scope);
          end if;
 
@@ -18085,9 +18085,22 @@ package body Sem_Ch3 is
 
          begin
             loop
-               if Ancestor = Original_Scope then
+               if Ancestor = Original_Type then
                   return True;
+
+               --  The ancestor may have a partial view of the original
+               --  type, but if the full view is in scope, as in a child
+               --  body, the component is visible.
+
+               elsif In_Private_Part (Scope (Original_Type))
+                 and then Full_View (Ancestor) = Original_Type
+               then
+                  return True;
+
                elsif Ancestor = Etype (Ancestor) then
+
+                  --  No further ancestors to examine.
+
                   return False;
                end if;
 

gcc/ada/sem_util.adb

@@ -17103,6 +17103,11 @@ package body Sem_Util is
       --  could be nested inside some other record that is constrained by
       --  nondiscriminants). That is, the recursive calls are too conservative.
 
+      function Has_Discrim_Dep_Array (Typ : Entity_Id) return Boolean;
+      --  True if we find certain discriminant-dependent array
+      --  subcomponents. This shouldn't be necessary, but without this check,
+      --  we crash in gimplify. ???
+
       function Caller_Known_Size_Record (Typ : Entity_Id) return Boolean is
          pragma Assert (Typ = Underlying_Type (Typ));
 
@@ -17150,7 +17155,49 @@ package body Sem_Util is
          return True;
       end Caller_Known_Size_Record;
 
-      --  Local deeclarations
+      function Has_Discrim_Dep_Array (Typ : Entity_Id) return Boolean is
+         pragma Assert (Typ = Underlying_Type (Typ));
+
+      begin
+         if Is_Array_Type (Typ) then
+            return Size_Depends_On_Discriminant (Typ);
+         end if;
+
+         if Is_Record_Type (Typ)
+           or else
+           Is_Protected_Type (Typ)
+         then
+            declare
+               Comp : Entity_Id := First_Entity (Typ);
+
+            begin
+               while Present (Comp) loop
+
+                  --  Only look at E_Component entities. No need to look at
+                  --  E_Discriminant entities, and we must ignore internal
+                  --  subtypes generated for constrained components.
+
+                  if Ekind (Comp) = E_Component then
+                     declare
+                        Comp_Type : constant Entity_Id :=
+                                      Underlying_Type (Etype (Comp));
+
+                     begin
+                        if Has_Discrim_Dep_Array (Comp_Type) then
+                           return True;
+                        end if;
+                     end;
+                  end if;
+
+                  Next_Entity (Comp);
+               end loop;
+            end;
+         end if;
+
+         return False;
+      end Has_Discrim_Dep_Array;
+
+      --  Local declarations
 
       Typ : constant Entity_Id := Underlying_Type (Id);
 
@@ -17184,26 +17231,26 @@ package body Sem_Util is
       elsif Is_Tagged_Type (Typ) or else Has_Controlled_Component (Typ) then
          return not Is_Value_Type (Typ);
 
-      --  Indefinite (discriminated) untagged record or protected type
-
-      elsif Is_Record_Type (Typ) or else Is_Protected_Type (Typ) then
-         return not Caller_Known_Size_Record (Typ);
-         --  ???Should come after Is_Definite_Subtype below
-
       --  Untagged definite subtypes are known size. This includes all
       --  elementary [sub]types. Tasks are known size even if they have
       --  discriminants.
 
       elsif Is_Definite_Subtype (Typ) or else Is_Task_Type (Typ) then
-         if Is_Array_Type (Typ) -- ???Shouldn't be necessary
+         if Is_Record_Type (Typ) or else Is_Protected_Type (Typ) then
-           and then New_Requires_Transient_Scope
+            if not Has_Discriminants (Typ) then
-                      (Underlying_Type (Component_Type (Typ)))
+               if Has_Discrim_Dep_Array (Typ) then
-         then
+                  return True; -- ???Shouldn't be necessary
-            return True;
+               end if;
+            end if;
          end if;
 
          return False;
 
+      --  Indefinite (discriminated) untagged record or protected type
+
+      elsif Is_Record_Type (Typ) or else Is_Protected_Type (Typ) then
+         return not Caller_Known_Size_Record (Typ);
+
       --  Unconstrained array
 
       else

gcc/ada/sem_util.ads

@@ -823,7 +823,7 @@ package Sem_Util is
    --  returned. Otherwise the Etype of the node is returned.
 
    function Get_Body_From_Stub (N : Node_Id) return Node_Id;
-   --  Return the body node for a stub (subprogram or package)
+   --  Return the body node for a stub.
 
    function Get_Cursor_Type
      (Aspect : Node_Id;