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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                             E X P _ I M G V                              --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--          Copyright (C) 2001-2011, Free Software Foundation, Inc.         --

--                                                                          --

-- GNAT is free software;  you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 3,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --

-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --

-- for  more details.  You should have  received  a copy of the GNU General --

-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --

-- http://www.gnu.org/licenses for a complete copy of the license.          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

with Atree;    use Atree;

with Casing;   use Casing;

with Checks;   use Checks;

with Einfo;    use Einfo;

with Exp_Util; use Exp_Util;

with Lib;      use Lib;

with Namet;    use Namet;

with Nmake;    use Nmake;

with Nlists;   use Nlists;

with Opt;      use Opt;

with Rtsfind;  use Rtsfind;

with Sem_Aux;  use Sem_Aux;

with Sem_Res;  use Sem_Res;

with Sinfo;    use Sinfo;

with Snames;   use Snames;

with Stand;    use Stand;

with Stringt;  use Stringt;

with Tbuild;   use Tbuild;

with Ttypes;   use Ttypes;

with Uintp;    use Uintp;

with Urealp;   use Urealp;

package body Exp_Imgv is

   function Has_Decimal_Small (E : Entity_Id) return Boolean;

   --  Applies to all entities. True for a Decimal_Fixed_Point_Type, or an

   --  Ordinary_Fixed_Point_Type with a small that is a negative power of ten.

   --  Shouldn't this be in einfo.adb or sem_aux.adb???

   ------------------------------------

   -- Build_Enumeration_Image_Tables --

   ------------------------------------

   procedure Build_Enumeration_Image_Tables (E : Entity_Id; N : Node_Id) is

      Loc  : constant Source_Ptr := Sloc (E);

      Str  : String_Id;

      Ind  : List_Id;

      Lit  : Entity_Id;

      Nlit : Nat;

      Len  : Nat;

      Estr : Entity_Id;

      Eind : Entity_Id;

      Ityp : Node_Id;

   begin

      --  Nothing to do for other than a root enumeration type

      if E /= Root_Type (E) then

         return;

      --  Nothing to do if pragma Discard_Names applies

      elsif Discard_Names (E) then

         return;

      end if;

      --  Otherwise tables need constructing

      Start_String;

      Ind := New_List;

      Lit := First_Literal (E);

      Len := 1;

      Nlit := 0;

      loop

         Append_To (Ind,

           Make_Integer_Literal (Loc, UI_From_Int (Len)));

         exit when No (Lit);

         Nlit := Nlit + 1;

         Get_Unqualified_Decoded_Name_String (Chars (Lit));

         if Name_Buffer (1) /= ''' then

            Set_Casing (All_Upper_Case);

         end if;

         Store_String_Chars (Name_Buffer (1 .. Name_Len));

         Len := Len + Int (Name_Len);

         Next_Literal (Lit);

      end loop;

      if Len < Int (2 ** (8 - 1)) then

         Ityp := Standard_Integer_8;

      elsif Len < Int (2 ** (16 - 1)) then

         Ityp := Standard_Integer_16;

      else

         Ityp := Standard_Integer_32;

      end if;

      Str := End_String;

      Estr :=

        Make_Defining_Identifier (Loc,

          Chars => New_External_Name (Chars (E), 'S'));

      Eind :=

        Make_Defining_Identifier (Loc,

          Chars => New_External_Name (Chars (E), 'N'));

      Set_Lit_Strings (E, Estr);

      Set_Lit_Indexes (E, Eind);

      Insert_Actions (N,

        New_List (

          Make_Object_Declaration (Loc,

            Defining_Identifier => Estr,

            Constant_Present    => True,

            Object_Definition   =>

              New_Occurrence_Of (Standard_String, Loc),

            Expression          =>

              Make_String_Literal (Loc,

                Strval => Str)),

          Make_Object_Declaration (Loc,

            Defining_Identifier => Eind,

            Constant_Present    => True,

            Object_Definition =>

              Make_Constrained_Array_Definition (Loc,

                Discrete_Subtype_Definitions => New_List (

                  Make_Range (Loc,

                    Low_Bound  => Make_Integer_Literal (Loc, 0),

                    High_Bound => Make_Integer_Literal (Loc, Nlit))),

                Component_Definition =>

                  Make_Component_Definition (Loc,

                    Aliased_Present    => False,

                    Subtype_Indication => New_Occurrence_Of (Ityp, Loc))),

            Expression          =>

              Make_Aggregate (Loc,

                Expressions => Ind))),

        Suppress => All_Checks);

   end Build_Enumeration_Image_Tables;

   ----------------------------

   -- Expand_Image_Attribute --

   ----------------------------

   --  For all cases other than user defined enumeration types, the scheme

   --  is as follows. First we insert the following code:

   --    Snn : String (1 .. rt'Width);

   --    Pnn : Natural;

   --    Image_xx (tv, Snn, Pnn [,pm]);

   --

   --  and then Expr is replaced by Snn (1 .. Pnn)

   --  In the above expansion:

   --    rt is the root type of the expression

   --    tv is the expression with the value, usually a type conversion

   --    pm is an extra parameter present in some cases

   --  The following table shows tv, xx, and (if used) pm for the various

   --  possible types of the argument:

   --    For types whose root type is Character

   --      xx = Character

   --      tv = Character (Expr)

   --    For types whose root type is Boolean

   --      xx = Boolean

   --      tv = Boolean (Expr)

   --    For signed integer types with size <= Integer'Size

   --      xx = Integer

   --      tv = Integer (Expr)

   --    For other signed integer types

   --      xx = Long_Long_Integer

   --      tv = Long_Long_Integer (Expr)

   --    For modular types with modulus <= System.Unsigned_Types.Unsigned

   --      xx = Unsigned

   --      tv = System.Unsigned_Types.Unsigned (Expr)

   --    For other modular integer types

   --      xx = Long_Long_Unsigned

   --      tv = System.Unsigned_Types.Long_Long_Unsigned (Expr)

   --    For types whose root type is Wide_Character

   --      xx = Wide_Character

   --      tv = Wide_Character (Expr)

   --      pm = Boolean, true if Ada 2005 mode, False otherwise

   --    For types whose root type is Wide_Wide_Character

   --      xx = Wide_Wide_Character

   --      tv = Wide_Wide_Character (Expr)

   --    For floating-point types

   --      xx = Floating_Point

   --      tv = Long_Long_Float (Expr)

   --      pm = typ'Digits (typ = subtype of expression)

   --    For ordinary fixed-point types

   --      xx = Ordinary_Fixed_Point

   --      tv = Long_Long_Float (Expr)

   --      pm = typ'Aft (typ = subtype of expression)

   --    For decimal fixed-point types with size = Integer'Size

   --      xx = Decimal

   --      tv = Integer (Expr)

   --      pm = typ'Scale (typ = subtype of expression)

   --    For decimal fixed-point types with size > Integer'Size

   --      xx = Long_Long_Decimal

   --      tv = Long_Long_Integer?(Expr) [convert with no scaling]

   --      pm = typ'Scale (typ = subtype of expression)

   --  For enumeration types other than those declared packages Standard

   --  or System, Snn, Pnn, are expanded as above, but the call looks like:

   --    Image_Enumeration_NN (rt'Pos (X), Snn, Pnn, typS, typI'Address)

   --  where rt is the root type of the expression, and typS and typI are

   --  the entities constructed as described in the spec for the procedure

   --  Build_Enumeration_Image_Tables and NN is 32/16/8 depending on the

   --  element type of Lit_Indexes. The rewriting of the expression to

   --  Snn (1 .. Pnn) then occurs as in the other cases. A special case is

   --  when pragma Discard_Names applies, in which case we replace expr by:

   --     (rt'Pos (expr))'Img

   --  So that the result is a space followed by the decimal value for the

   --  position of the enumeration value in the enumeration type.

   procedure Expand_Image_Attribute (N : Node_Id) is

      Loc       : constant Source_Ptr := Sloc (N);

      Exprs     : constant List_Id    := Expressions (N);

      Pref      : constant Node_Id    := Prefix (N);

      Ptyp      : constant Entity_Id  := Entity (Pref);

      Rtyp      : constant Entity_Id  := Root_Type (Ptyp);

      Expr      : constant Node_Id    := Relocate_Node (First (Exprs));

      Imid      : RE_Id;

      Tent      : Entity_Id;

      Ttyp      : Entity_Id;

      Proc_Ent  : Entity_Id;

      Enum_Case : Boolean;

      Arg_List : List_Id;

      --  List of arguments for run-time procedure call

      Ins_List : List_Id;

      --  List of actions to be inserted

      Snn : constant Entity_Id := Make_Temporary (Loc, 'S');

      Pnn : constant Entity_Id := Make_Temporary (Loc, 'P');

   begin

      --  Build declarations of Snn and Pnn to be inserted

      Ins_List := New_List (

         --  Snn : String (1 .. typ'Width);

         Make_Object_Declaration (Loc,

            Defining_Identifier => Snn,

            Object_Definition   =>

              Make_Subtype_Indication (Loc,

                Subtype_Mark => New_Occurrence_Of (Standard_String, Loc),

                Constraint   =>

                  Make_Index_Or_Discriminant_Constraint (Loc,

                    Constraints => New_List (

                      Make_Range (Loc,

                        Low_Bound  => Make_Integer_Literal (Loc, 1),

                        High_Bound =>

                          Make_Attribute_Reference (Loc,

                            Prefix         => New_Occurrence_Of (Rtyp, Loc),

                            Attribute_Name => Name_Width)))))),

         --  Pnn : Natural;

         Make_Object_Declaration (Loc,

           Defining_Identifier => Pnn,

           Object_Definition   => New_Occurrence_Of (Standard_Natural, Loc)));

      --  Set Imid (RE_Id of procedure to call), and Tent, target for the

      --  type conversion of the first argument for all possibilities.

      Enum_Case := False;

      if Rtyp = Standard_Boolean then

         Imid := RE_Image_Boolean;

         Tent := Rtyp;

      --  For standard character, we have to select the version which handles

      --  soft hyphen correctly, based on the version of Ada in use (ugly!)

      elsif Rtyp = Standard_Character then

         if Ada_Version < Ada_2005 then

            Imid := RE_Image_Character;

         else

            Imid := RE_Image_Character_05;

         end if;

         Tent := Rtyp;

      elsif Rtyp = Standard_Wide_Character then

         Imid := RE_Image_Wide_Character;

         Tent := Rtyp;

      elsif Rtyp = Standard_Wide_Wide_Character then

         Imid := RE_Image_Wide_Wide_Character;

         Tent := Rtyp;

      elsif Is_Signed_Integer_Type (Rtyp) then

         if Esize (Rtyp) <= Esize (Standard_Integer) then

            Imid := RE_Image_Integer;

            Tent := Standard_Integer;

         else

            Imid := RE_Image_Long_Long_Integer;

            Tent := Standard_Long_Long_Integer;

         end if;

      elsif Is_Modular_Integer_Type (Rtyp) then

         if Modulus (Rtyp) <= Modulus (RTE (RE_Unsigned)) then

            Imid := RE_Image_Unsigned;

            Tent := RTE (RE_Unsigned);

         else

            Imid := RE_Image_Long_Long_Unsigned;

            Tent := RTE (RE_Long_Long_Unsigned);

         end if;

      elsif Is_Fixed_Point_Type (Rtyp) and then Has_Decimal_Small (Rtyp) then

         if UI_To_Int (Esize (Rtyp)) <= Standard_Integer_Size then

            Imid := RE_Image_Decimal;

            Tent := Standard_Integer;

         else

            Imid := RE_Image_Long_Long_Decimal;

            Tent := Standard_Long_Long_Integer;

         end if;

      elsif Is_Ordinary_Fixed_Point_Type (Rtyp) then

         Imid := RE_Image_Ordinary_Fixed_Point;

         Tent := Standard_Long_Long_Float;

      elsif Is_Floating_Point_Type (Rtyp) then

         Imid := RE_Image_Floating_Point;

         Tent := Standard_Long_Long_Float;

      --  Only other possibility is user defined enumeration type

      else

         if Discard_Names (First_Subtype (Ptyp))

           or else No (Lit_Strings (Root_Type (Ptyp)))

         then

            --  When pragma Discard_Names applies to the first subtype, build

            --  (Pref'Pos (Expr))'Img.

            Rewrite (N,

              Make_Attribute_Reference (Loc,

                Prefix =>

                   Make_Attribute_Reference (Loc,

                     Prefix         => Pref,

                     Attribute_Name => Name_Pos,

                     Expressions    => New_List (Expr)),

                Attribute_Name =>

                  Name_Img));

            Analyze_And_Resolve (N, Standard_String);

            return;

         else

            --  Here for enumeration type case

            Ttyp := Component_Type (Etype (Lit_Indexes (Rtyp)));

            if Ttyp = Standard_Integer_8 then

               Imid := RE_Image_Enumeration_8;

            elsif Ttyp = Standard_Integer_16 then

               Imid := RE_Image_Enumeration_16;

            else

               Imid := RE_Image_Enumeration_32;

            end if;

            --  Apply a validity check, since it is a bit drastic to get a

            --  completely junk image value for an invalid value.

            if not Expr_Known_Valid (Expr) then

               Insert_Valid_Check (Expr);

            end if;

            Enum_Case := True;

         end if;

      end if;

      --  Build first argument for call

      if Enum_Case then

         Arg_List := New_List (

           Make_Attribute_Reference (Loc,

             Attribute_Name => Name_Pos,

             Prefix         => New_Occurrence_Of (Ptyp, Loc),

             Expressions    => New_List (Expr)));

      else

         Arg_List := New_List (Convert_To (Tent, Expr));

      end if;

      --  Append Snn, Pnn arguments

      Append_To (Arg_List, New_Occurrence_Of (Snn, Loc));

      Append_To (Arg_List, New_Occurrence_Of (Pnn, Loc));

      --  Get entity of procedure to call

      Proc_Ent := RTE (Imid);

      --  If the procedure entity is empty, that means we have a case in

      --  no run time mode where the operation is not allowed, and an

      --  appropriate diagnostic has already been issued.

      if No (Proc_Ent) then

         return;

      end if;

      --  Otherwise complete preparation of arguments for run-time call

      --  Add extra arguments for Enumeration case

      if Enum_Case then

         Append_To (Arg_List, New_Occurrence_Of (Lit_Strings (Rtyp), Loc));

         Append_To (Arg_List,

           Make_Attribute_Reference (Loc,

             Prefix         => New_Occurrence_Of (Lit_Indexes (Rtyp), Loc),

             Attribute_Name => Name_Address));

      --  For floating-point types, append Digits argument

      elsif Is_Floating_Point_Type (Rtyp) then

         Append_To (Arg_List,

           Make_Attribute_Reference (Loc,

             Prefix         => New_Reference_To (Ptyp, Loc),

             Attribute_Name => Name_Digits));

      --  For ordinary fixed-point types, append Aft parameter

      elsif Is_Ordinary_Fixed_Point_Type (Rtyp) then

         Append_To (Arg_List,

           Make_Attribute_Reference (Loc,

             Prefix         => New_Reference_To (Ptyp, Loc),

             Attribute_Name => Name_Aft));

         if Has_Decimal_Small (Rtyp) then

            Set_Conversion_OK (First (Arg_List));

            Set_Etype (First (Arg_List), Tent);

         end if;

      --  For decimal, append Scale and also set to do literal conversion

      elsif Is_Decimal_Fixed_Point_Type (Rtyp) then

         Append_To (Arg_List,

           Make_Attribute_Reference (Loc,

             Prefix         => New_Reference_To (Ptyp, Loc),

             Attribute_Name => Name_Scale));

         Set_Conversion_OK (First (Arg_List));

         Set_Etype (First (Arg_List), Tent);

      --  For Wide_Character, append Ada 2005 indication

      elsif Rtyp = Standard_Wide_Character then

         Append_To (Arg_List,

           New_Reference_To (Boolean_Literals (Ada_Version >= Ada_2005), Loc));

      end if;

      --  Now append the procedure call to the insert list

      Append_To (Ins_List,

         Make_Procedure_Call_Statement (Loc,

          Name                   => New_Reference_To (Proc_Ent, Loc),

          Parameter_Associations => Arg_List));

      --  Insert declarations of Snn, Pnn, and the procedure call. We suppress

      --  checks because we are sure that everything is in range at this stage.

      Insert_Actions (N, Ins_List, Suppress => All_Checks);

      --  Final step is to rewrite the expression as a slice and analyze,

      --  again with no checks, since we are sure that everything is OK.

      Rewrite (N,

        Make_Slice (Loc,

          Prefix         => New_Occurrence_Of (Snn, Loc),

          Discrete_Range =>

            Make_Range (Loc,

              Low_Bound  => Make_Integer_Literal (Loc, 1),

              High_Bound => New_Occurrence_Of (Pnn, Loc))));

      Analyze_And_Resolve (N, Standard_String, Suppress => All_Checks);

   end Expand_Image_Attribute;

   ----------------------------

   -- Expand_Value_Attribute --

   ----------------------------

   --  For scalar types derived from Boolean, Character and integer types

   --  in package Standard, typ'Value (X) expands into:

   --    btyp (Value_xx (X))

   --  where btyp is he base type of the prefix

   --    For types whose root type is Character

   --      xx = Character

   --    For types whose root type is Wide_Character

   --      xx = Wide_Character

   --    For types whose root type is Wide_Wide_Character

   --      xx = Wide_Wide_Character

   --    For types whose root type is Boolean

   --      xx = Boolean

   --    For signed integer types with size <= Integer'Size

   --      xx = Integer

   --    For other signed integer types

   --      xx = Long_Long_Integer

   --    For modular types with modulus <= System.Unsigned_Types.Unsigned

   --      xx = Unsigned

   --    For other modular integer types

   --      xx = Long_Long_Unsigned

   --    For floating-point types and ordinary fixed-point types

   --      xx = Real

   --  For Wide_[Wide_]Character types, typ'Value (X) expands into:

   --    btyp (Value_xx (X, EM))

   --  where btyp is the base type of the prefix, and EM is the encoding method

   --  For decimal types with size <= Integer'Size, typ'Value (X)

   --  expands into

   --    btyp?(Value_Decimal (X, typ'Scale));

   --  For all other decimal types, typ'Value (X) expands into

   --    btyp?(Value_Long_Long_Decimal (X, typ'Scale))

   --  For enumeration types other than those derived from types Boolean,

   --  Character, Wide_[Wide_]Character in Standard, typ'Value (X) expands to:

   --    Enum'Val (Value_Enumeration_NN (typS, typI'Address, Num, X))

   --  where typS and typI and the Lit_Strings and Lit_Indexes entities

   --  from T's root type entity, and Num is Enum'Pos (Enum'Last). The

   --  Value_Enumeration_NN function will search the tables looking for

   --  X and return the position number in the table if found which is

   --  used to provide the result of 'Value (using Enum'Val). If the

   --  value is not found Constraint_Error is raised. The suffix _NN

   --  depends on the element type of typI.

   procedure Expand_Value_Attribute (N : Node_Id) is

      Loc   : constant Source_Ptr := Sloc (N);

      Typ   : constant Entity_Id  := Etype (N);

      Btyp  : constant Entity_Id  := Base_Type (Typ);

      Rtyp  : constant Entity_Id  := Root_Type (Typ);

      Exprs : constant List_Id    := Expressions (N);

      Vid   : RE_Id;

      Args  : List_Id;

      Func  : RE_Id;

      Ttyp  : Entity_Id;

   begin

      Args := Exprs;

      if Rtyp = Standard_Character then

         Vid := RE_Value_Character;

      elsif Rtyp = Standard_Boolean then

         Vid := RE_Value_Boolean;

      elsif Rtyp = Standard_Wide_Character then

         Vid := RE_Value_Wide_Character;

         Append_To (Args,

           Make_Integer_Literal (Loc,

             Intval => Int (Wide_Character_Encoding_Method)));

      elsif Rtyp = Standard_Wide_Wide_Character then

         Vid := RE_Value_Wide_Wide_Character;

         Append_To (Args,

           Make_Integer_Literal (Loc,

             Intval => Int (Wide_Character_Encoding_Method)));

      elsif     Rtyp = Base_Type (Standard_Short_Short_Integer)

        or else Rtyp = Base_Type (Standard_Short_Integer)

        or else Rtyp = Base_Type (Standard_Integer)

      then

         Vid := RE_Value_Integer;

      elsif Is_Signed_Integer_Type (Rtyp) then

         Vid := RE_Value_Long_Long_Integer;

      elsif Is_Modular_Integer_Type (Rtyp) then

         if Modulus (Rtyp) <= Modulus (RTE (RE_Unsigned)) then

            Vid := RE_Value_Unsigned;

         else

            Vid := RE_Value_Long_Long_Unsigned;

         end if;

      elsif Is_Decimal_Fixed_Point_Type (Rtyp) then

         if UI_To_Int (Esize (Rtyp)) <= Standard_Integer_Size then

            Vid := RE_Value_Decimal;

         else

            Vid := RE_Value_Long_Long_Decimal;

         end if;

         Append_To (Args,

           Make_Attribute_Reference (Loc,

             Prefix => New_Reference_To (Typ, Loc),

             Attribute_Name => Name_Scale));

         Rewrite (N,

           OK_Convert_To (Btyp,

             Make_Function_Call (Loc,

               Name => New_Reference_To (RTE (Vid), Loc),

               Parameter_Associations => Args)));

         Set_Etype (N, Btyp);

         Analyze_And_Resolve (N, Btyp);

         return;

      elsif Is_Real_Type (Rtyp) then

         Vid := RE_Value_Real;

      --  Only other possibility is user defined enumeration type

      else

         pragma Assert (Is_Enumeration_Type (Rtyp));

         --  Case of pragma Discard_Names, transform the Value

         --  attribute to Btyp'Val (Long_Long_Integer'Value (Args))

         if Discard_Names (First_Subtype (Typ))

           or else No (Lit_Strings (Rtyp))

         then

            Rewrite (N,

              Make_Attribute_Reference (Loc,

                Prefix => New_Reference_To (Btyp, Loc),

                Attribute_Name => Name_Val,

                Expressions => New_List (

                  Make_Attribute_Reference (Loc,

                    Prefix =>

                      New_Occurrence_Of (Standard_Long_Long_Integer, Loc),

                    Attribute_Name => Name_Value,

                    Expressions => Args))));

            Analyze_And_Resolve (N, Btyp);

         --  Here for normal case where we have enumeration tables, this

         --  is where we build

         --    T'Val (Value_Enumeration_NN (typS, typI'Address, Num, X))

         else

            Ttyp := Component_Type (Etype (Lit_Indexes (Rtyp)));

            if Ttyp = Standard_Integer_8 then

               Func := RE_Value_Enumeration_8;

            elsif Ttyp = Standard_Integer_16  then

               Func := RE_Value_Enumeration_16;

            else

               Func := RE_Value_Enumeration_32;

            end if;

            Prepend_To (Args,

              Make_Attribute_Reference (Loc,

                Prefix => New_Occurrence_Of (Rtyp, Loc),

                Attribute_Name => Name_Pos,

                Expressions => New_List (

                  Make_Attribute_Reference (Loc,

                    Prefix => New_Occurrence_Of (Rtyp, Loc),

                    Attribute_Name => Name_Last))));

            Prepend_To (Args,

              Make_Attribute_Reference (Loc,

                Prefix => New_Occurrence_Of (Lit_Indexes (Rtyp), Loc),

                Attribute_Name => Name_Address));

            Prepend_To (Args,

              New_Occurrence_Of (Lit_Strings (Rtyp), Loc));

            Rewrite (N,

              Make_Attribute_Reference (Loc,

                Prefix => New_Reference_To (Typ, Loc),

                Attribute_Name => Name_Val,

                Expressions => New_List (

                  Make_Function_Call (Loc,

                    Name =>

                      New_Reference_To (RTE (Func), Loc),

                    Parameter_Associations => Args))));

            Analyze_And_Resolve (N, Btyp);

         end if;

         return;

      end if;

      --  Fall through for all cases except user defined enumeration type

      --  and decimal types, with Vid set to the Id of the entity for the

      --  Value routine and Args set to the list of parameters for the call.

      --  Compiling package Ada.Tags under No_Run_Time_Mode we disable the

      --  expansion of the attribute into the function call statement to avoid

      --  generating spurious errors caused by the use of Integer_Address'Value

      --  in our implementation of Ada.Tags.Internal_Tag

      --  Seems like a bit of a kludge, there should be a better way ???

      --  There is a better way, you should also test RTE_Available ???

      if No_Run_Time_Mode

        and then Rtyp = RTE (RE_Integer_Address)

        and then RTU_Loaded (Ada_Tags)

        and then Cunit_Entity (Current_Sem_Unit)

                   = Body_Entity (RTU_Entity (Ada_Tags))

      then

         Rewrite (N,

           Unchecked_Convert_To (Rtyp,

             Make_Integer_Literal (Loc, Uint_0)));

      else

         Rewrite (N,

           Convert_To (Btyp,

             Make_Function_Call (Loc,

               Name => New_Reference_To (RTE (Vid), Loc),

               Parameter_Associations => Args)));

      end if;

      Analyze_And_Resolve (N, Btyp);

   end Expand_Value_Attribute;

   ---------------------------------

   -- Expand_Wide_Image_Attribute --

   ---------------------------------

   --  We expand typ'Wide_Image (X) as follows. First we insert this code:

   --    Rnn : Wide_String (1 .. rt'Wide_Width);

   --    Lnn : Natural;

   --    String_To_Wide_String

   --      (typ'Image (Expr), Rnn, Lnn, Wide_Character_Encoding_Method);

   --  where rt is the root type of the prefix type

   --  Now we replace the Wide_Image reference by

   --    Rnn (1 .. Lnn)

   --  This works in all cases because String_To_Wide_String converts any

   --  wide character escape sequences resulting from the Image call to the

   --  proper Wide_Character equivalent

   --  not quite right for typ = Wide_Character ???

   procedure Expand_Wide_Image_Attribute (N : Node_Id) is

      Loc  : constant Source_Ptr := Sloc (N);

      Rtyp : constant Entity_Id  := Root_Type (Entity (Prefix (N)));

      Rnn  : constant Entity_Id := Make_Temporary (Loc, 'S');

      Lnn  : constant Entity_Id := Make_Temporary (Loc, 'P');

   begin

      Insert_Actions (N, New_List (