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-- C3A2A01.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 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 units, each of which has a formal

--      general access type:

--

--         (1) A generic package, in which X is declared in the specification,

--             and X'Access occurs within the declarative part of the body.

--

--         (2) A generic package, in which X is a formal in out object of a

--             tagged formal derived type, and X'Access occurs in the sequence

--             of statements of a nested subprogram.

--

--         (3) A generic procedure, in which X is a dereference of an access

--             parameter, and X'Access occurs in the sequence of statements.

--

--      The test verifies the following:

--

--         For (1), Program_Error is raised upon instantiation if the generic

--         package is instantiated at a deeper level than that of the general

--         access type passed as an actual. The exception is propagated to the

--         innermost enclosing master.

--

--         For (2), Program_Error is raised when the nested subprogram is

--         called if the object passed as an actual during instantiation of

--         the generic package has an accessibility level deeper than that of

--         the general access type passed as an actual. The exception is

--         handled within the nested subprogram. Also, check that

--         Program_Error is not raised if the level of the actual access type

--         is deeper than that of the actual object.

--

--         For (3), Program_Error is raised when the instance subprogram is

--         called if the object pointed to by the actual corresponding to

--         the access parameter has an accessibility level deeper than that of

--         the general access type passed as an actual during instantiation.

--         The exception is handled within the instance subprogram. Also,

--         check that Program_Error is not raised if the level of the actual

--         access type is deeper than that of the actual corresponding to the

--         access parameter.

--

-- TEST FILES:

--      The following files comprise this test:

--

--         F3A2A00.A

--      -> C3A2A01.A

--

--

-- CHANGE HISTORY:

--      12 May 95   SAIC    Initial prerelease version.

--      10 Jul 95   SAIC    Modified code to avoid dead variable optimization.

--

--!

with F3A2A00;

generic

   type FD  is new F3A2A00.Array_Type;

   type FAF is access all FD;

package C3A2A01_0 is

   X : aliased FD;

   procedure Dummy;  -- Needed to allow package body.

end C3A2A01_0;

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

with Report;

package body C3A2A01_0 is

   Ptr   : FAF     := X'Access;

   Index : Integer := F3A2A00.Array_Type'First;

   procedure Dummy is

   begin

      null;

   end Dummy;

begin

   -- Avoid optimization (dead variable removal of Ptr):

   if not Report.Equal (Ptr(Index).C, Ptr(Index).C) then   -- Always false.

      Report.Failed ("Unexpected error in C3A2A01_0 instance");

   end if;

end C3A2A01_0;

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

with F3A2A00;

generic

   type FD  is new F3A2A00.Tagged_Type with private;

   type FAF is access all FD;

   FObj : in out FD;

package C3A2A01_1 is

   procedure Handle (R: out F3A2A00.TC_Result_Kind);

end C3A2A01_1;

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

with Report;

package body C3A2A01_1 is

   procedure Handle (R: out F3A2A00.TC_Result_Kind) is

      Ptr : FAF;

   begin

      Ptr := FObj'Access;

      R   := F3A2A00.OK;

      -- Avoid optimization (dead variable removal of Ptr):

      if not Report.Equal (Ptr.C, Ptr.C) then              -- Always false.

         Report.Failed ("Unexpected error in Handle");

      end if;

   exception

      when Program_Error => R := F3A2A00.P_E;

      when others        => R := F3A2A00.O_E;

   end Handle;

end C3A2A01_1;

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

with F3A2A00;

generic

   type FD  is new F3A2A00.Array_Type;

   type FAF is access all FD;

procedure C3A2A01_2 (P: access FD; R: out F3A2A00.TC_Result_Kind);

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

with Report;

procedure C3A2A01_2 (P: access FD; R: out F3A2A00.TC_Result_Kind) is

   Ptr   : FAF;

   Index : Integer := F3A2A00.Array_Type'First;

begin

   Ptr := P.all'Access;

   R   := F3A2A00.OK;

   -- Avoid optimization (dead variable removal of Ptr):

   if not Report.Equal (Ptr(Index).C, Ptr(Index).C) then   -- Always false.

      Report.Failed ("Unexpected error in C3A2A01_2 instance");

   end if;

exception

   when Program_Error => R := F3A2A00.P_E;

   when others        => R := F3A2A00.O_E;

end C3A2A01_2;

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

with F3A2A00;

with C3A2A01_0;

with C3A2A01_1;

with C3A2A01_2;

with Report;

procedure C3A2A01 is

begin -- C3A2A01.                                              -- [ Level = 1 ]

   Report.Test ("C3A2A01", "Run-time accessibility checks: instance " &

                "bodies. Type of X'Access is passed as actual to instance");

   SUBTEST1:

   declare                                                     -- [ Level = 2 ]

      Result : F3A2A00.TC_Result_Kind;

   begin -- SUBTEST1.

      declare                                                  -- [ Level = 3 ]

         type AccArr_L3 is access all F3A2A00.Array_Type;

      begin

         declare                                               -- [ Level = 4 ]

            -- The accessibility level of Pack.X is that of the instantiation

            -- (4). The accessibility level of the actual access type used to

            -- instantiate Pack is 3. Therefore, the X'Access in Pack

            -- propagates Program_Error when the instance body is elaborated:

            package Pack is new C3A2A01_0 (F3A2A00.Array_Type, AccArr_L3);

         begin

            Result := F3A2A00.OK;

         end;

      exception

         when Program_Error => Result := F3A2A00.P_E;       -- Expected result.

         when others        => Result := F3A2A00.O_E;

      end;

      F3A2A00.TC_Display_Results (Result, F3A2A00.P_E, "SUBTEST #1");

   end SUBTEST1;

   SUBTEST2:

   declare                                                     -- [ Level = 2 ]

      Result : F3A2A00.TC_Result_Kind;

   begin -- SUBTEST2.

      declare                                                  -- [ Level = 3 ]

         -- The instantiation of C3A2A01_1 should NOT result in any

         -- exceptions.

         type AccTag_L3 is access all F3A2A00.Tagged_Type;

         package Pack_OK is new C3A2A01_1 (F3A2A00.Tagged_Type,

                                           AccTag_L3,

                                           F3A2A00.X_L0);

      begin

         -- The accessibility level of the actual object used to instantiate

         -- Pack_OK is 0. The accessibility level of the actual access type

         -- used to instantiate Pack_OK is 3. Therefore, the FObj'Access in

         -- Pack_OK.Handle does not raise an exception when the subprogram is

         -- called. If an exception is (incorrectly) raised, however, it is

         -- handled within the subprogram:

         Pack_OK.Handle (Result);

      end;

      F3A2A00.TC_Display_Results (Result, F3A2A00.OK, "SUBTEST #2");

   exception

      when Program_Error =>

         Report.Failed ("SUBTEST #2: Program_Error incorrectly raised " &

                        "during instantiation of generic");

      when others        =>

         Report.Failed ("SUBTEST #2: Unexpected exception raised " &

                        "during instantiation of generic");

   end SUBTEST2;

   SUBTEST3:

   declare                                                     -- [ Level = 2 ]

      Result : F3A2A00.TC_Result_Kind;

   begin -- SUBTEST3.

      declare                                                  -- [ Level = 3 ]

         -- The instantiation of C3A2A01_1 should NOT result in any

         -- exceptions.

         X_L3: F3A2A00.Tagged_Type;

         package Pack_PE is new C3A2A01_1 (F3A2A00.Tagged_Type,

                                           F3A2A00.AccTag_L0,

                                           X_L3);

      begin

         -- The accessibility level of the actual object used to instantiate

         -- Pack_PE is 3. The accessibility level of the actual access type

         -- used to instantiate Pack_PE is 0. Therefore, the FObj'Access in

         -- Pack_OK.Handle raises Program_Error when the subprogram is

         -- called. The exception is handled within the subprogram:

         Pack_PE.Handle (Result);

      end;

      F3A2A00.TC_Display_Results (Result, F3A2A00.P_E, "SUBTEST #3");

   exception

      when Program_Error =>

         Report.Failed ("SUBTEST #3: Program_Error incorrectly raised " &

                        "during instantiation of generic");

      when others        =>

         Report.Failed ("SUBTEST #3: Unexpected exception raised " &

                        "during instantiation of generic");

   end SUBTEST3;

   SUBTEST4:

   declare                                                     -- [ Level = 2 ]

      Result1 : F3A2A00.TC_Result_Kind;

      Result2 : F3A2A00.TC_Result_Kind;

   begin -- SUBTEST4.

      declare                                                  -- [ Level = 3 ]

         -- The instantiation of C3A2A01_2 should NOT result in any

         -- exceptions.

         X_L3: aliased F3A2A00.Array_Type;

         type AccArr_L3 is access all F3A2A00.Array_Type;

         procedure Proc is new C3A2A01_2 (F3A2A00.Array_Type, AccArr_L3);

      begin

         -- The accessibility level of Proc.P.all is that of the corresponding

         -- actual during the call (in this case 3). The accessibility level of

         -- the access type used to instantiate Proc is also 3. Therefore, the

         -- P.all'Access in Proc does not raise an exception when the

         -- subprogram is called. If an exception is (incorrectly) raised,

         -- however, it is handled within the subprogram:

         Proc (X_L3'Access, Result1);

         F3A2A00.TC_Display_Results (Result1, F3A2A00.OK,

                                     "SUBTEST #4: same levels");

         declare                                               -- [ Level = 4 ]

            X_L4: aliased F3A2A00.Array_Type;

         begin

            -- Within this block, the accessibility level of the actual

            -- corresponding to Proc.P.all is 4. Therefore, the P.all'Access

            -- in Proc raises Program_Error when the subprogram is called. The

            -- exception is handled within the subprogram:

            Proc (X_L4'Access, Result2);

            F3A2A00.TC_Display_Results (Result2, F3A2A00.P_E,

                                        "SUBTEST #4: object at deeper level");

         end;

      end;

   exception

      when Program_Error =>

         Report.Failed ("SUBTEST #4: Program_Error incorrectly raised " &

                        "during instantiation of generic");

      when others        =>

         Report.Failed ("SUBTEST #4: Unexpected exception raised " &

                        "during instantiation of generic");

   end SUBTEST4;

   Report.Result;

end C3A2A01;