-- C3A2A02.A
--
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--
--     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, for X'Access of a general access type A, Program_Error is
--      raised if the accessibility level of X is deeper than that of A.
--      Check for cases where X'Access occurs in an instance body, and A
--      is a type either declared inside the instance, or declared outside
--      the instance but not passed as an actual during instantiation.
--
-- TEST DESCRIPTION:
--      In order to satisfy accessibility requirements, the designated
--      object X must be at the same or a less deep nesting level than the
--      general access type A -- X must "live" as long as A. Nesting
--      levels are the run-time nestings of masters: block statements;
--      subprogram, task, and entry bodies; and accept statements. Packages
--      are invisible to accessibility rules.
--
--      This test declares three generic packages:
--
--         (1) One in which X is of a formal tagged derived type and declared
--             in the body, A is a type declared outside the instance, and
--             X'Access occurs in the declarative part of a nested subprogram.
--
--         (2) One in which X is a formal object of a tagged type, A is a
--             type declared outside the instance, and X'Access occurs in the
--             declarative part of the body.
--
--         (3) One in which there are two X's and two A's. In the first pair,
--             X is a formal in object of a tagged type, A is declared in the
--             specification, and X'Access occurs in the declarative part of
--             the body. In the second pair, X is of a formal derived type,
--             X and A are declared in the specification, and X'Access occurs
--             in the sequence of statements of the body.
--
--      The test verifies the following:
--
--         For (1), Program_Error is raised when the nested subprogram is
--         called, if the generic package is instantiated at a deeper level
--         than that of A. The exception is propagated to the innermost
--         enclosing master. Also, check that Program_Error is not raised
--         if the instantiation is at the same level as that of A.
--
--         For (2), Program_Error is raised upon instantiation if the object
--         passed as an actual during instantiation has an accessibility level
--         deeper than that of A. The exception is propagated to the innermost
--         enclosing master. Also, check that Program_Error is not raised if
--         the level of the actual object is not deeper than that of A.
--
--         For (3), Program_Error is not raised, for actual objects at
--         various accessibility levels (since A will have at least the same
--         accessibility level as X in all cases, no exception should ever
--         be raised).
--
-- TEST FILES:
--      The following files comprise this test:
--
--         F3A2A00.A
--      -> C3A2A02.A
--
--
-- CHANGE HISTORY:
--      12 May 95   SAIC    Initial prerelease version.
--      10 Jul 95   SAIC    Modified code to avoid dead variable optimization.
--      26 Jun 98   EDS     Added pragma Elaborate (C3A2A02_0) to package
--                          package C3A2A02_3, in order to avoid possible
--                          instantiation error.
--!

with F3A2A00;
generic
   type FD is new F3A2A00.Tagged_Type with private;
package C3A2A02_0 is
   procedure Proc;
end C3A2A02_0;


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


with Report;
package body C3A2A02_0 is
   X : aliased FD;

   procedure Proc is
      Ptr : F3A2A00.AccTagClass_L0 := X'Access;
   begin
      -- Avoid optimization (dead variable removal of Ptr):

      if not Report.Equal (Ptr.C, Ptr.C) then              -- Always false.
         Report.Failed ("Unexpected error in Proc");
      end if;
   end Proc;
end C3A2A02_0;


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


with F3A2A00;
generic
   FObj : in out F3A2A00.Tagged_Type;
package C3A2A02_1 is
   procedure Dummy; -- Needed to allow package body.
end C3A2A02_1;


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


with Report;
package body C3A2A02_1 is
   Ptr : F3A2A00.AccTag_L0 := FObj'Access;

   procedure Dummy is
   begin
      null;
   end Dummy;
begin
   -- Avoid optimization (dead variable removal of Ptr):

   if not Report.Equal (Ptr.C, Ptr.C) then              -- Always false.
      Report.Failed ("Unexpected error in C3A2A02_1 instance");
   end if;
end C3A2A02_1;


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


with F3A2A00;
generic
   type FD is new F3A2A00.Array_Type;
   FObj : in F3A2A00.Tagged_Type;
package C3A2A02_2 is
   type GAF is access all FD;
   type GAO is access constant F3A2A00.Tagged_Type;
   XG    : aliased FD;
   PtrF  : GAF;
   Index : Integer := FD'First;

   procedure Dummy; -- Needed to allow package body.
end C3A2A02_2;


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


with Report;
package body C3A2A02_2 is
   PtrO : GAO := FObj'Access;

   procedure Dummy is
   begin
      null;
   end Dummy;
begin
   PtrF := XG'Access;

   -- Avoid optimization (dead variable removal of PtrO and/or PtrF):

   if not Report.Equal (PtrO.C, PtrO.C) then                -- Always false.
      Report.Failed ("Unexpected error in C3A2A02_2 instance: PtrO");
   end if;

   if not Report.Equal (PtrF(Index).C, PtrF(Index).C) then  -- Always false.
      Report.Failed ("Unexpected error in C3A2A02_2 instance: PtrF");
   end if;
end C3A2A02_2;


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


-- The instantiation of C3A2A02_0 should NOT result in any exceptions.

with F3A2A00;
with C3A2A02_0;
pragma Elaborate (C3A2A02_0);
package C3A2A02_3 is new C3A2A02_0 (F3A2A00.Tagged_Type);


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


with F3A2A00;
with C3A2A02_0;
with C3A2A02_1;
with C3A2A02_2;
with C3A2A02_3;

with Report;
procedure C3A2A02 is
begin -- C3A2A02.                                              -- [ Level = 1 ]

   Report.Test ("C3A2A02", "Run-time accessibility checks: instance " &
                "bodies. Type of X'Access is local or global to instance");


   SUBTEST1:
   declare                                                     -- [ Level = 2 ]
      Result1 : F3A2A00.TC_Result_Kind;
      Result2 : F3A2A00.TC_Result_Kind;
   begin -- SUBTEST1.

      declare                                                  -- [ Level = 3 ]
         package Pack_Same_Level renames C3A2A02_3;
      begin
         -- The accessibility level of Pack_Same_Level.X is that of the
         -- instance (0), not that of the renaming declaration. The level of
         -- the type of Pack_Same_Level.X'Access (F3A2A00.AccTagClass_L0) is
         -- 0. Therefore, the X'Access in Pack_Same_Level.Proc does not raise
         -- an exception when the subprogram is called. The level of execution
         -- of the subprogram is irrelevant:

         Pack_Same_Level.Proc;
         Result1 := F3A2A00.OK;                             -- Expected result.
      exception
         when Program_Error => Result1 := F3A2A00.P_E;
         when others        => Result1 := F3A2A00.O_E;
      end;

      F3A2A00.TC_Display_Results (Result1, F3A2A00.OK,
                                  "SUBTEST #1 (same level)");


      declare                                                  -- [ Level = 3 ]
         -- The instantiation of C3A2A02_0 should NOT result in any
         -- exceptions.

         package Pack_Deeper_Level is new C3A2A02_0 (F3A2A00.Tagged_Type);
      begin
         -- The accessibility level of Pack_Deeper_Level.X is that of the
         -- instance (3). The level of the type of Pack_Deeper_Level.X'Access
         -- (F3A2A00.AccTagClass_L0) is 0. Therefore, the X'Access in
         -- Pack_Deeper_Level.Proc propagates Program_Error when the
         -- subprogram is called:

         Pack_Deeper_Level.Proc;
         Result2 := F3A2A00.OK;
      exception
         when Program_Error => Result2 := F3A2A00.P_E;      -- Expected result.
         when others        => Result2 := F3A2A00.O_E;
      end;

      F3A2A00.TC_Display_Results (Result2, F3A2A00.P_E,
                                  "SUBTEST #1: deeper level");

   exception
      when Program_Error =>
         Report.Failed ("SUBTEST #1: Program_Error incorrectly raised " &
                        "during instantiation of generic");
      when others        =>
         Report.Failed ("SUBTEST #1: Unexpected exception raised " &
                        "during instantiation of generic");
   end SUBTEST1;


   SUBTEST2:
   declare                                                     -- [ Level = 2 ]
      Result1 : F3A2A00.TC_Result_Kind;
      Result2 : F3A2A00.TC_Result_Kind;
   begin -- SUBTEST2.

      declare                                                  -- [ Level = 3 ]
         X_L3 : F3A2A00.Tagged_Type;
      begin
         declare                                               -- [ Level = 4 ]
            -- The accessibility level of the actual object corresponding to
            -- FObj in Pack_PE is 3. The level of the type of FObj'Access
            -- (F3A2A00.AccTag_L0) is 0. Therefore, the FObj'Access in Pack_PE
            -- propagates Program_Error when the instance body is elaborated:

            package Pack_PE is new C3A2A02_1 (X_L3);
         begin
            Result1 := F3A2A00.OK;
         end;
      exception
         when Program_Error => Result1 := F3A2A00.P_E;      -- Expected result.
         when others        => Result1 := F3A2A00.O_E;
      end;

      F3A2A00.TC_Display_Results (Result1, F3A2A00.P_E,
                                  "SUBTEST #2: deeper level");


      begin                                                    -- [ Level = 3 ]
         declare                                               -- [ Level = 4 ]
            -- The accessibility level of the actual object corresponding to
            -- FObj in Pack_OK is 0. The level of the type of FObj'Access
            -- (F3A2A00.AccTag_L0) is also 0. Therefore, the FObj'Access in
            -- Pack_OK does not raise an exception when the instance body is
            -- elaborated:

            package Pack_OK is new C3A2A02_1 (F3A2A00.X_L0);
         begin
            Result2 := F3A2A00.OK;                          -- Expected result.
         end;
      exception
         when Program_Error => Result2 := F3A2A00.P_E;
         when others        => Result2 := F3A2A00.O_E;
      end;

      F3A2A00.TC_Display_Results (Result2, F3A2A00.OK,
                                  "SUBTEST #2: same level");

   end SUBTEST2;


   SUBTEST3:
   declare                                                     -- [ Level = 2 ]
      Result1 : F3A2A00.TC_Result_Kind;
      Result2 : F3A2A00.TC_Result_Kind;
   begin -- SUBTEST3.

      declare                                                  -- [ Level = 3 ]
         X_L3 : F3A2A00.Tagged_Type;
      begin
         declare                                               -- [ Level = 4 ]
            -- Since the accessibility level of the type of X'Access in
            -- both cases within Pack_OK1 is that of the instance, and since
            -- X is either passed as an actual (in which case its level will
            -- not be deeper than that of the instance) or is declared within
            -- the instance (in which case its level is the same as that of
            -- the instance), no exception should be raised when the instance
            -- body is elaborated:

            package Pack_OK1 is new C3A2A02_2 (F3A2A00.Array_Type, X_L3);
         begin
            Result1 := F3A2A00.OK;                          -- Expected result.
         end;
      exception
         when Program_Error => Result1 := F3A2A00.P_E;
         when others        => Result1 := F3A2A00.O_E;
      end;

      F3A2A00.TC_Display_Results (Result1, F3A2A00.OK,
                                  "SUBTEST #3: 1st okay case");


      declare                                                  -- [ Level = 3 ]
         type My_Array is new F3A2A00.Array_Type;
      begin
         declare                                               -- [ Level = 4 ]
            -- Since the accessibility level of the type of X'Access in
            -- both cases within Pack_OK2 is that of the instance, and since
            -- X is either passed as an actual (in which case its level will
            -- not be deeper than that of the instance) or is declared within
            -- the instance (in which case its level is the same as that of
            -- the instance), no exception should be raised when the instance
            -- body is elaborated:

            package Pack_OK2 is new C3A2A02_2 (My_Array, F3A2A00.X_L0);
         begin
            Result2 := F3A2A00.OK;                          -- Expected result.
         end;
      exception
         when Program_Error => Result2 := F3A2A00.P_E;
         when others        => Result2 := F3A2A00.O_E;
      end;

      F3A2A00.TC_Display_Results (Result2, F3A2A00.OK,
                                  "SUBTEST #3: 2nd okay case");


   end SUBTEST3;


   Report.Result;

end C3A2A02;