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1 294 jeremybenn
-- C3A2002.A
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--
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--                             Grant of Unlimited Rights
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--
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--     Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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--     F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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--     unlimited rights in the software and documentation contained herein.
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--     Unlimited rights are defined in DFAR 252.227-7013(a)(19).  By making
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--     this public release, the Government intends to confer upon all
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--     recipients unlimited rights  equal to those held by the Government.
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--     These rights include rights to use, duplicate, release or disclose the
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--     released technical data and computer software in whole or in part, in
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--     any manner and for any purpose whatsoever, and to have or permit others
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--     to do so.
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--
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--                                    DISCLAIMER
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--
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--     ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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--     DISCLOSED ARE AS IS.  THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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--     WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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--     SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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--     OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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--     PARTICULAR PURPOSE OF SAID MATERIAL.
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--*
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--
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-- OBJECTIVE:
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--      Check that, for X'Access of a general access type A, Program_Error is
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--      raised if the accessibility level of X is deeper than that of A.
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--      Check for the case where X denotes a view that is a dereference of an
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--      access parameter, or a rename thereof.
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--
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--      Check for cases where the actual corresponding to X is:
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--         (a) An allocator.
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--         (b) An expression of a named access type.
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--         (c) Obj'Access.
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--
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-- TEST DESCRIPTION:
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--      In order to satisfy accessibility requirements, the designated
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--      object X must be at the same or a less deep nesting level than the
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--      general access type A -- X must "live" as long as A. Nesting
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--      levels are the run-time nestings of masters: block statements;
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--      subprogram, task, and entry bodies; and accept statements. Packages
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--      are invisible to accessibility rules.
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--
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--      This test declares subprograms with access parameters, within which
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--      'Access is attempted on a dereference of the access parameter, and
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--      assigned to an access object whose type A is declared at some nesting
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--      level. The test verifies that Program_Error is raised if the actual
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--      corresponding to the access parameter is:
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--
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--         (1) an allocator, and the accessibility level of the execution
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--             of the called subprogram is deeper than that of the access
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--             type A.
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--
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--         (2) an expression of a named access type, and the accessibility
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--             level of the named access type is deeper than that of the
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--             access type A.
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--
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--         (3) a reference to the Access attribute (e.g., X'Access), and
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--             the accessibility level of X is deeper than that of the
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--             access type A.
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--
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--      Note that the static nesting level of the actual corresponding to the
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--      access parameter can be deeper than that of the type A -- it is
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--      the run-time nesting that matters for accessibility rules. Consider
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--      the case where the access type A is declared within the called
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--      subprogram. The accessibility check will never fail, even if the
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--      actual happens to have a deeper static nesting level:
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--
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--         procedure P (X: access T) is
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--            type A is access all T;   -- Static level = 2, e.g.
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--            Acc : A := X.all'Access;  -- Check should never fail.
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--         begin null; end;
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--         . . .
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--         declare
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--            Actual : aliased T;       -- Static level = 3, e.g.
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--         begin
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--            P (Actual'Access);
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--         end;
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--
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--         For the execution of P, the accessibility level of type A will
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--         always be deeper than that of Actual, so there is no danger of a
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--         dangling reference arising from the assignment to Acc. Thus,
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--         X.all'Access is safe, even though the static nesting level of
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--         Actual is deeper than that of A.
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--
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--
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-- CHANGE HISTORY:
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--      06 Dec 94   SAIC    ACVC 2.0
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--
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--!
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package C3A2002_0 is
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   type Desig is array (1 .. 10) of Integer;
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   X0 : aliased Desig;                                            -- Level = 0.
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   type Acc_L0 is access all Desig;                               -- Level = 0.
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   A0 : Acc_L0;
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   type Result_Kind is (OK, P_E, O_E);
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   procedure A_Is_Level_0 (X: access Desig; R : out Result_Kind);
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   procedure Never_Fails  (X: access Desig; R : out Result_Kind);
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end C3A2002_0;
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     --==================================================================--
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package body C3A2002_0 is
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   procedure A_Is_Level_0 (X : access Desig;
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                           R : out Result_Kind) is
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   begin
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      -- The accessibility level of the type of A0 is 0.
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      A0 := X.all'Access;
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      R  := OK;
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   exception
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      when Program_Error =>
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         R := P_E;
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      when others        =>
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         R := O_E;
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   end A_Is_Level_0;
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   -----------------------------------------------
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   procedure Never_Fails (X: access Desig;
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                          R : out Result_Kind) is
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      type Acc_Local is access all Desig;
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      AL : Acc_Local;
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   begin
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      -- X.all'Access below will always be safe, since the accessibility
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      -- level (although not necessarily the static nesting depth) of the
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      -- type of AL will always be deeper than or the same as that of the
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      -- actual corresponding to Y.
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      AL := X.all'Access;
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      R  := OK;
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   exception
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      when Program_Error =>
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         R := P_E;
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      when others        =>
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         R := O_E;
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   end Never_Fails;
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end C3A2002_0;
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     --==================================================================--
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with C3A2002_0;
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with Report;
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procedure C3A2002 is
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   X1 : aliased C3A2002_0.Desig;                                  -- Level = 1.
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   type Acc_L1 is access all C3A2002_0.Desig;                     -- Level = 1.
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   A1 : Acc_L1;
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   Expr_L0 : C3A2002_0.Acc_L0 := C3A2002_0.X0'Access;
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   Expr_L1 : Acc_L1           := X1'Access;
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165
   Res : C3A2002_0.Result_Kind;
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   use type C3A2002_0.Result_Kind;
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   -----------------------------------------------
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   procedure A_Is_Level_1 (X : access C3A2002_0.Desig;
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                           R : out C3A2002_0.Result_Kind) is
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      -- Dereference of an access_to_object value is aliased.
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      Ren : C3A2002_0.Desig renames X.all;      -- Renaming of a dereference
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   begin                                        -- of an access parameter.
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      -- The accessibility level of the type of A1 is 1.
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      A1 := Ren'Access;
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      R  := C3A2002_0.OK;
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   exception
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      when Program_Error =>
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         R := C3A2002_0.P_E;
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      when others        =>
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         R := C3A2002_0.O_E;
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   end A_Is_Level_1;
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   -----------------------------------------------
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   procedure Display_Results (Result  : in C3A2002_0.Result_Kind;
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                              Expected: in C3A2002_0.Result_Kind;
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                              Message : in String) is
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   begin
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      if Result /= Expected then
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         case Result is
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            when C3A2002_0.OK  => Report.Failed ("No exception raised: "  &
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                                                 Message);
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            when C3A2002_0.P_E => Report.Failed ("Program_Error raised: " &
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                                                 Message);
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            when C3A2002_0.O_E => Report.Failed ("Unexpected exception "  &
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                                                 "raised: " & Message);
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         end case;
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      end if;
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   end Display_Results;
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begin -- C3A2002
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   Report.Test ("C3A2002", "Check that, for X'Access of general access "   &
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                "type A, Program_Error is raised if the accessibility "    &
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                "level of X is deeper than that of A: X is an access "     &
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                "parameter; corresponding actual is an allocator, "        &
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                "expression of a named access type, Obj'Access, or a "     &
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                "rename thereof");
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   -- Actual is X'Access:
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   C3A2002_0.Never_Fails (C3A2002_0.X0'Access, Res);
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   Display_Results (Res, C3A2002_0.OK, "X0'Access, local access type");
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   C3A2002_0.A_Is_Level_0 (C3A2002_0.X0'Access, Res);
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   Display_Results (Res, C3A2002_0.OK, "X0'Access, level 0 access type");
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   C3A2002_0.A_Is_Level_0 (X1'Access, Res);
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   Display_Results (Res, C3A2002_0.P_E, "X1'Access, level 0 access type");
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   A_Is_Level_1 (X1'Access, Res);
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   Display_Results (Res, C3A2002_0.OK, "X1'Access, level 1 access type");
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   -- Actual is expression of a named access type:
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   C3A2002_0.Never_Fails (Expr_L1, Res);
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   Display_Results (Res, C3A2002_0.OK, "Expr_L1, local access type");
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   C3A2002_0.A_Is_Level_0 (Expr_L1, Res);
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   Display_Results (Res, C3A2002_0.P_E, "Expr_L1, level 0 access type");
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   A_Is_Level_1 (Expr_L0, Res);
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   Display_Results (Res, C3A2002_0.OK, "Expr_L0, level 1 access type");
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   A_Is_Level_1 (Expr_L1, Res);
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   Display_Results (Res, C3A2002_0.OK, "Expr_L1, level 1 access type");
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   -- Actual is allocator (level of execution = 2):
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   C3A2002_0.Never_Fails (new C3A2002_0.Desig, Res);
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   Display_Results (Res, C3A2002_0.OK, "Allocator level 2, " &
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                                       "local access type");
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   -- Since actual is an allocator, its accessibility level is that of
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   -- the execution of the called subprogram, i.e., level 2.
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   C3A2002_0.A_Is_Level_0 (new C3A2002_0.Desig, Res);
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   Display_Results (Res, C3A2002_0.P_E, "Allocator level 2, " &
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                                        "level 0 access type");
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   A_Is_Level_1 (new C3A2002_0.Desig, Res);
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   Display_Results (Res, C3A2002_0.P_E, "Allocator level 2, " &
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                                        "level 1 access type");
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   Block_L2:
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   declare
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      X2 : aliased C3A2002_0.Desig;                               -- Level = 2.
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      type Acc_L2 is access all C3A2002_0.Desig;                  -- Level = 2.
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      Expr_L2 : Acc_L2 := X1'Access;
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   begin
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      -- Actual is X'Access:
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      C3A2002_0.Never_Fails (X2'Access, Res);
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      Display_Results (Res, C3A2002_0.OK, "X2'Access, local access type");
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      C3A2002_0.A_Is_Level_0 (X2'Access, Res);
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      Display_Results (Res, C3A2002_0.P_E, "X2'Access, level 0 access type");
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275
      -- Actual is expression of a named access type:
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277
      A_Is_Level_1 (Expr_L2, Res);
278
      Display_Results (Res, C3A2002_0.P_E, "Expr_L2, level 1 access type");
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      -- Actual is allocator (level of execution = 3):
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283
      C3A2002_0.Never_Fails (new C3A2002_0.Desig, Res);
284
      Display_Results (Res, C3A2002_0.OK, "Allocator level 3, " &
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                                          "local access type");
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      A_Is_Level_1 (new C3A2002_0.Desig, Res);
288
      Display_Results (Res, C3A2002_0.P_E, "Allocator level 3, " &
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                                           "level 1 access type");
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291
   end Block_L2;
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   Report.Result;
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end C3A2002;

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