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-- C460006.A

--

--                             Grant of Unlimited Rights

--

--     Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,

--     F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained

--     unlimited rights in the software and documentation contained herein.

--     Unlimited rights are defined in DFAR 252.227-7013(a)(19).  By making

--     this public release, the Government intends to confer upon all

--     recipients unlimited rights  equal to those held by the Government.

--     These rights include rights to use, duplicate, release or disclose the

--     released technical data and computer software in whole or in part, in

--     any manner and for any purpose whatsoever, and to have or permit others

--     to do so.

--

--                                    DISCLAIMER

--

--     ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR

--     DISCLOSED ARE AS IS.  THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED

--     WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE

--     SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE

--     OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A

--     PARTICULAR PURPOSE OF SAID MATERIAL.

--*

--

-- OBJECTIVE:

--      Check that a view conversion to a tagged type is permitted in the

--      prefix of a selected component, an object renaming declaration, and

--      (if the operand is a variable) on the left side of an assignment

--      statement. Check that such a renaming or assignment does not change

--      the tag of the operand.

--

--      Check that, for a view conversion of a tagged type, each

--      nondiscriminant component of the new view denotes the matching

--      component of the operand object. Check that reading the value of the

--      view yields the result of converting the value of the operand object

--      to the target subtype.

--

-- TEST DESCRIPTION:

--      The fact that the tag of an object is not changed is verified by

--      making calls to primitive operations which in turn make (re)dispatching

--      calls, and confirming that the proper bodies are executed.

--

--      Selected components are checked in three contexts: as the object name

--      in an object renaming declaration, as the left operand of an inequality

--      operation, and as the left side of an assignment statement.

--

--      View conversions of an object of a 2nd level type extension are

--      renamed as objects of an ancestor type and of a class-wide type. In

--      one case the operand of the conversion is itself a renaming of an

--      object.

--

--      View conversions of an object of a 2nd level type extension are

--      checked for equality with record aggregates of various ancestor types.

--      In one case, the view conversion is to a class-wide type, and it is

--      checked for equality with the result of a class-wide function with

--      the following structure:

--

--         function F return T'Class is

--            A : DDT     := Expected_Value;

--            X : T'Class := T(A);

--         begin

--            return X;

--

--         end F;

--

--         ...

--

--         Var : DDT := Expected_Value;

--

--         if (T'Class(Var) /= F) then    -- Condition should yield FALSE.

--            FAIL;

--         end if;

--

--      The view conversion to which X is initialized does not affect the

--      value or tag of the operand; the tag of X is that of type DDT (not T),

--      and the components are those of A. The result of this function

--      should equal the value of an object of type DDT initialized to the

--      same value as F.A.

--

--      To check that assignment to a view conversion does not change the tag

--      of the operand, an assignment is made to a conversion of an object,

--      and the object is then passed as an actual to a dispatching operation.

--      Conversions to both specific and class-wide types are checked.

--

--

-- CHANGE HISTORY:

--      20 Jul 95   SAIC    Initial prerelease version.

--      24 Apr 96   SAIC    Added type conversions.

--

--!

package C460006_0 is

   type Call_ID_Kind is (None, Parent_Outer,     Parent_Inner,

                               Child_Outer,      Child_Inner,

                               Grandchild_Outer, Grandchild_Inner);

   type Root_Type is abstract tagged record

      First_Call  : Call_ID_Kind := None;

      Second_Call : Call_ID_Kind := None;

   end record;

   procedure Inner_Proc (X : in out Root_Type) is abstract;

   procedure Outer_Proc (X : in out Root_Type) is abstract;

end C460006_0;

     --==================================================================--

package C460006_0.C460006_1 is

   type Parent_Type is new Root_Type with record

      C1 : Integer := 0;

   end record;

   procedure Inner_Proc (X : in out Parent_Type);

   procedure Outer_Proc (X : in out Parent_Type);

end C460006_0.C460006_1;

     --==================================================================--

package body C460006_0.C460006_1 is

   procedure Inner_Proc (X : in out Parent_Type) is

   begin

      X.Second_Call := Parent_Inner;

   end Inner_Proc;

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

   procedure Outer_Proc (X : in out Parent_Type) is

   begin

      X.First_Call := Parent_Outer;

      Inner_Proc ( Parent_Type'Class(X) );

   end Outer_Proc;

end C460006_0.C460006_1;

     --==================================================================--

package C460006_0.C460006_1.C460006_2 is

   type Child_Type is new Parent_Type with record

      C2 : String(1 .. 5) := "-----";

   end record;

   procedure Inner_Proc (X : in out Child_Type);

   procedure Outer_Proc (X : in out Child_Type);

end C460006_0.C460006_1.C460006_2;

     --==================================================================--

package body C460006_0.C460006_1.C460006_2 is

   procedure Inner_Proc (X : in out Child_Type) is

   begin

      X.Second_Call := Child_Inner;

   end Inner_Proc;

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

   procedure Outer_Proc (X : in out Child_Type) is

   begin

      X.First_Call := Child_Outer;

      Inner_Proc ( Parent_Type'Class(X) );

   end Outer_Proc;

end C460006_0.C460006_1.C460006_2;

     --==================================================================--

package C460006_0.C460006_1.C460006_2.C460006_3 is

   type Grandchild_Type is new Child_Type with record

      C3: String(1 .. 5) := "-----";

   end record;

   procedure Inner_Proc (X : in out Grandchild_Type);

   procedure Outer_Proc (X : in out Grandchild_Type);

   function ClassWide_Func return Parent_Type'Class;

   Grandchild_Value : constant Grandchild_Type := (First_Call  => None,

                                                   Second_Call => None,

                                                   C1          => 15,

                                                   C2          => "Hello",

                                                   C3          => "World");

end C460006_0.C460006_1.C460006_2.C460006_3;

     --==================================================================--

package body C460006_0.C460006_1.C460006_2.C460006_3 is

   procedure Inner_Proc (X : in out Grandchild_Type) is

   begin

      X.Second_Call := Grandchild_Inner;

   end Inner_Proc;

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

   procedure Outer_Proc (X : in out Grandchild_Type) is

   begin

      X.First_Call := Grandchild_Outer;

      Inner_Proc ( Parent_Type'Class(X) );

   end Outer_Proc;

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

   function ClassWide_Func return Parent_Type'Class is

      A : Grandchild_Type   := Grandchild_Value;

      X : Parent_Type'Class := Parent_Type(A); -- Value of X is still that of A.

   begin

      return X;

   end ClassWide_Func;

end C460006_0.C460006_1.C460006_2.C460006_3;

     --==================================================================--

with C460006_0.C460006_1.C460006_2.C460006_3;

with Report;

procedure C460006 is

   package Root_Package       renames C460006_0;

   package Parent_Package     renames C460006_0.C460006_1;

   package Child_Package      renames C460006_0.C460006_1.C460006_2;

   package Grandchild_Package renames C460006_0.C460006_1.C460006_2.C460006_3;

begin

   Report.Test ("C460006", "Check that a view conversion to a tagged type " &

                "is permitted in the prefix of a selected component, an "   &

                "object renaming declaration, and (if the operand is a "    &

                "variable) on the left side of an assignment statement.  "  &

                "Check that such a renaming or assignment does not change " &

                " the tag of the operand");

   --

   -- Check conversion as prefix of selected component:

   --

   Selected_Component_Subtest:

   declare

      use Root_Package, Parent_Package, Child_Package, Grandchild_Package;

      Var    : Grandchild_Type   := Grandchild_Value;

      CW_Var : Parent_Type'Class := Var;

      Ren    : Integer renames Parent_Type(Var).C1;

   begin

      if Ren /= 15 then

         Report.Failed ("Wrong value: selected component in renaming");

      end if;

      if Child_Type(Var).C2 /= "Hello" then

         Report.Failed ("Wrong value: selected component in IF");

      end if;

      Grandchild_Type(CW_Var).C3(2..4) := "eir";

      if CW_Var /= Parent_Type'Class

                   (Grandchild_Type'(None, None, 15, "Hello", "Weird"))

      then

         Report.Failed ("Wrong value: selected component in assignment");

      end if;

   end Selected_Component_Subtest;

   --

   -- Check conversion in object renaming:

   --

   Object_Renaming_Subtest:

   declare

      use Root_Package, Parent_Package, Child_Package, Grandchild_Package;

      Var : Grandchild_Type := Grandchild_Value;

      Ren1 : Parent_Type       renames Parent_Type(Var);

      Ren2 : Child_Type        renames Child_Type(Var);

      Ren3 : Parent_Type'Class renames Parent_Type'Class(Var);

      Ren4 : Parent_Type       renames Parent_Type(Ren2); -- Rename of rename.

   begin

      Outer_Proc (Ren1);

      if Ren1 /= (Parent_Outer, Grandchild_Inner, 15) then

         Report.Failed ("Value or tag not preserved by object renaming: Ren1");

      end if;

      Outer_Proc (Ren2);

      if Ren2 /= (Child_Outer, Grandchild_Inner, 15, "Hello") then

         Report.Failed ("Value or tag not preserved by object renaming: Ren2");

      end if;

      Outer_Proc (Ren3);

      if Ren3 /= Parent_Type'Class

                 (Grandchild_Type'(Grandchild_Outer,

                                   Grandchild_Inner,

                                   15,

                                   "Hello",

                                   "World"))

      then

         Report.Failed ("Value or tag not preserved by object renaming: Ren3");

      end if;

      Outer_Proc (Ren4);

      if Ren4 /= (Parent_Outer, Grandchild_Inner, 15) then

         Report.Failed ("Value or tag not preserved by object renaming: Ren4");

      end if;

   end Object_Renaming_Subtest;

   --

   -- Check reading view conversion, and conversion as left side of assignment:

   --

   View_Conversion_Subtest:

   declare

      use Root_Package, Parent_Package, Child_Package, Grandchild_Package;

      Var : Grandchild_Type := Grandchild_Value;

      Specific  : Child_Type;

      ClassWide : Parent_Type'Class := Var;   -- Grandchild_Type tag.

   begin

      if Parent_Type(Var) /= (None, None, 15) then

         Report.Failed ("View has wrong value: #1");

      end if;

      if Child_Type(Var) /= (None, None, 15, "Hello") then

         Report.Failed ("View has wrong value: #2");

      end if;

      if Parent_Type'Class(Var) /= ClassWide_Func then

         Report.Failed ("Upward view conversion did not preserve " &

                        "extension's components");

      end if;

      Parent_Type(Specific) := (None, None, 26); -- Assign to view.

      Outer_Proc (Specific);                     -- Call dispatching op.

      if Specific /= (Child_Outer, Child_Inner, 26, "-----") then

         Report.Failed ("Value or tag not preserved by assignment: Specific");

      end if;

      Parent_Type(ClassWide) := (None, None, 44); -- Assign to view.

      Outer_Proc (ClassWide);                     -- Call dispatching op.

      if ClassWide /= Parent_Type'Class

                      (Grandchild_Type'(Grandchild_Outer,

                                        Grandchild_Inner,

                                        44,

                                        "Hello",

                                        "World"))

      then

         Report.Failed ("Value or tag not preserved by assignment: ClassWide");

      end if;

   end View_Conversion_Subtest;

   Report.Result;

end C460006;