[multiple changes]

2015-05-22  Robert Dewar  <dewar@adacore.com>

	* a-reatim.ads: Add Compile_Time_Error to ensure Duration
	is 64-bits.
	* sem_ch13.adb: Improve error message.
	* exp_ch4.adb: Minor reformatting.

2015-05-22  Hristian Kirtchev  <kirtchev@adacore.com>

	* sem_prag.adb (Analyze_Pragma): Constants without variable
	input do not require indicator Part_Of.
	(Check_Missing_Part_Of): Constants without variable input do not
	requrie indicator Part_Of.
	(Collect_Visible_States): Constants without variable input are
	not part of the hidden state of a package.
	* sem_util.ads, sem_util.adb (Has_Variable_Input): New routine.

From-SVN: r223531

gcc/ada/ChangeLog

-2015-05-21  Robert Dewar  <dewar@adacore.com>
+2015-05-22  Robert Dewar  <dewar@adacore.com>
+
+	* a-reatim.ads: Add Compile_Time_Error to ensure Duration
+	is 64-bits.
+	* sem_ch13.adb: Improve error message.
+	* exp_ch4.adb: Minor reformatting.
+
+2015-05-22  Hristian Kirtchev  <kirtchev@adacore.com>
+
+	* sem_prag.adb (Analyze_Pragma): Constants without variable
+	input do not require indicator Part_Of.
+	(Check_Missing_Part_Of): Constants without variable input do not
+	requrie indicator Part_Of.
+	(Collect_Visible_States): Constants without variable input are
+	not part of the hidden state of a package.
+	* sem_util.ads, sem_util.adb (Has_Variable_Input): New routine.
+
+2015-05-22  Robert Dewar  <dewar@adacore.com>
 
 	* exp_util.adb (Activate_Atomic_Synchronization): Do not set
 	Atomic_Sync_Required for an object renaming declaration.
 	* sem_ch8.adb (Analyze_Object_Renaming): Copy Is_Atomic and
 	Is_Independent to renaming object.
 
-2015-05-21  Ed Schonberg  <schonberg@adacore.com>
+2015-05-22  Ed Schonberg  <schonberg@adacore.com>
 
 	* sem_ch5.adb (Analyze_Iterator_Specification): Diagnose
 	various illegalities in iterators over arrays and containers:

gcc/ada/a-reatim.ads

@@ -38,6 +38,10 @@ pragma Elaborate_All (System.Task_Primitives.Operations);
 
 package Ada.Real_Time is
 
+   pragma Compile_Time_Error
+     (Duration'Size /= 64,
+      "this version of Ada.Real_Time requires 64-bit Duration");
+
    type Time is private;
    Time_First : constant Time;
    Time_Last  : constant Time;

gcc/ada/exp_ch4.adb

@@ -7688,12 +7688,13 @@ package body Exp_Ch4 is
 
             begin
                if (Nkind (P) = N_Op_Multiply
-                   and then not Non_Binary_Modulus (Typ)
-                   and then
-                     ((Is_Integer_Type (Etype (L)) and then R = N)
-                         or else
-                      (Is_Integer_Type (Etype (R)) and then L = N))
-                   and then not Do_Overflow_Check (P))
+                    and then not Non_Binary_Modulus (Typ)
+                    and then
+                      ((Is_Integer_Type (Etype (L)) and then R = N)
+                          or else
+                       (Is_Integer_Type (Etype (R)) and then L = N))
+                    and then not Do_Overflow_Check (P))
+
                  or else
                   (Nkind (P) = N_Op_Divide
                     and then Is_Integer_Type (Etype (L))
@@ -7706,7 +7707,7 @@ package body Exp_Ch4 is
                end if;
             end;
 
-         --  Now the other cases
+         --  Now the other cases where we convert to 1 * (2 ** K)
 
          elsif not Non_Binary_Modulus (Typ) then
             Rewrite (N,

gcc/ada/sem_ch13.adb

@@ -3890,28 +3890,42 @@ package body Sem_Ch13 is
 
             elsif No (Next_Formal (First_Formal (Subp))) then
                Illegal_Indexing
-                  ("indexing function must have at least two parameters");
+                 ("indexing function must have at least two parameters");
                return;
 
             elsif Is_Derived_Type (Ent) then
-               if (Attr = Name_Constant_Indexing
-                    and then Present
-                      (Find_Aspect (Etype (Ent), Aspect_Constant_Indexing)))
-                 or else
-                   (Attr = Name_Variable_Indexing
-                     and then Present
-                       (Find_Aspect (Etype (Ent), Aspect_Variable_Indexing)))
-               then
-                  if Debug_Flag_Dot_XX then
-                     null;
+               declare
+                  Inherited : Node_Id;
 
-                  else
-                     Illegal_Indexing
-                        ("indexing function already inherited "
-                          & "from parent type");
-                     return;
+               begin
+                  if Attr = Name_Constant_Indexing then
+                     Inherited :=
+                       Find_Aspect (Etype (Ent), Aspect_Constant_Indexing);
+                  elsif Attr = Name_Variable_Indexing then
+                     Inherited :=
+                        Find_Aspect (Etype (Ent), Aspect_Variable_Indexing);
                   end if;
-               end if;
+
+                  --  What if neither branch taken above ???
+
+                  if Present (Inherited) then
+                     if Debug_Flag_Dot_XX then
+                        null;
+
+                     --  Indicate the operation that must be overridden,
+                     --  rather than redefining the indexing aspect
+
+                     else
+                        Illegal_Indexing
+                          ("indexing function already inherited "
+                           & "from parent type");
+                        Error_Msg_NE
+                          ("!override& instead",
+                           N, Entity (Expression (Inherited)));
+                        return;
+                     end if;
+                  end if;
+               end;
             end if;
 
             if not Check_Primitive_Function (Subp) then

gcc/ada/sem_prag.adb

@@ -2710,7 +2710,7 @@ package body Sem_Prag is
          Legal   : out Boolean);
       --  Subsidiary to the analysis of pragmas Abstract_State and Part_Of.
       --  Perform full analysis of indicator Part_Of. Item_Id is the entity of
-      --  an abstract state, variable or package instantiation. State is the
+      --  an abstract state, object or package instantiation. State is the
       --  encapsulating state. Indic is the Part_Of indicator. Flag Legal is
       --  set when the indicator is legal.
 
@@ -17557,6 +17557,20 @@ package body Sem_Prag is
                Legal   => Legal);
 
             if Legal then
+
+               --  Constants without "variable input" are not considered part
+               --  of the hidden state of a package (SPARK RM 7.1.1(2)). As a
+               --  result such constants do not require a Part_Of indicator.
+
+               if Ekind (Item_Id) = E_Constant
+                 and then not Has_Variable_Input (Item_Id)
+               then
+                  SPARK_Msg_NE
+                    ("useless Part_Of indicator, constant & does not have "
+                     & "variable input", N, Item_Id);
+                  return;
+               end if;
+
                State_Id := Entity (State);
 
                --  The Part_Of indicator turns an object into a constituent of
@@ -24448,7 +24462,18 @@ package body Sem_Prag is
                   --  formals to their actuals as the formals cannot be named
                   --  from the outside and participate in refinement.
 
-                  if No (Corresponding_Generic_Association (Decl)) then
+                  if Present (Corresponding_Generic_Association (Decl)) then
+                     null;
+
+                  --  Constants without "variable input" are not considered a
+                  --  hidden state of a package (SPARK RM 7.1.1(2)).
+
+                  elsif Ekind (Item_Id) = E_Constant
+                    and then not Has_Variable_Input (Item_Id)
+                  then
+                     null;
+
+                  else
                      Add_Item (Item_Id, Result);
                   end if;
 
@@ -24993,6 +25018,14 @@ package body Sem_Prag is
 
       elsif SPARK_Mode /= On then
          return;
+
+      --  Do not consider constants without variable input because those are
+      --  not part of the hidden state of a package (SPARK RM 7.1.1(2)).
+
+      elsif Ekind (Item_Id) = E_Constant
+        and then not Has_Variable_Input (Item_Id)
+      then
+         return;
       end if;
 
       --  Find where the abstract state, variable or package instantiation

gcc/ada/sem_util.adb

@@ -9317,6 +9317,18 @@ package body Sem_Util is
       end if;
    end Has_Tagged_Component;
 
+   ------------------------
+   -- Has_Variable_Input --
+   ------------------------
+
+   function Has_Variable_Input (Const_Id : Entity_Id) return Boolean is
+      Expr : constant Node_Id := Expression (Declaration_Node (Const_Id));
+
+   begin
+      return
+        Present (Expr) and then not Compile_Time_Known_Value_Or_Aggr (Expr);
+   end Has_Variable_Input;
+
    ----------------------------
    -- Has_Volatile_Component --
    ----------------------------

gcc/ada/sem_util.ads

@@ -1046,6 +1046,11 @@ package Sem_Util is
    --  component is present. This function is used to check if "=" has to be
    --  expanded into a bunch component comparisons.
 
+   function Has_Variable_Input (Const_Id : Entity_Id) return Boolean;
+   --  Determine whether the initialization expression of constant Const_Id has
+   --  "variable input" (SPARK RM 7.1.1(2)). This roughly maps to the semantic
+   --  concept of a compile-time known value.
+
    function Has_Volatile_Component (Typ : Entity_Id) return Boolean;
    --  Given an arbitrary type, determine whether it contains at least one
    --  volatile component.