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1 294 jeremybenn
-- C460002.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 if the target type of a type conversion is a general
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--      access type, Program_Error is raised if the accessibility level
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--      of the operand type is deeper than that of the target type.
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--      Check for the case where the operand is an access parameter,
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--      and the actual corresponding to the access parameter is another
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--      access parameter.
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--
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-- TEST DESCRIPTION:
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--      In order to satisfy accessibility requirements, the operand type
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--      must be at the same or a less deep nesting level than the target
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--      type -- the operand type must "live" as long as the target type.
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--      Nesting 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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--      a type conversion is attempted on the access parameter to an access
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--      type A declared at some nesting level. The test verifies that
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--      Program_Error is raised if the actual corresponding to the access
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--      parameter is another access parameter, and the actual corresponding
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--      to this second access parameter is:
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--
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--         (1) 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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--         (2) 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 target type -- 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 := A(X);          -- Check should never fail.
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--         begin null; end;
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--         . . .
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--         procedure Q (Y: access T) is
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--         begin
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--            P(Y);
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--         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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--            Q (Actual'Access);
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--         end;
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--
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--         For the execution of Q (and hence P), the accessibility level of
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--         type A will always be deeper than that of Actual, so there is no
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--         danger of a dangling reference arising from the assignment to
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--         Acc. Thus, the type conversion is safe, even though the static
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--         nesting level of 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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--      19 Dec 94   SAIC    Changed maintenance documentation.
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--      15 Jul 98   EDS     Avoid Optimization
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--      28 Jun 02   RLB     Added pragma Elaborate_All.
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--!
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with Report; use Report; pragma Elaborate_All (Report);
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package C460002_0 is
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   type Component is array (1 .. 10) of Natural;
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   type Desig is record
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      C: Component;
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   end record;
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   X0 : aliased Desig := (C=>(others => Ident_Int(3)));    -- 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 Target_Is_Level_0_Nest (Y: access Desig; S: out Result_Kind);
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   procedure Never_Fails_Nest       (Y: access Desig; S: out Result_Kind);
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   procedure Never_Fails_Same       (Y: access Desig; S: out Result_Kind);
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end C460002_0;
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     --==================================================================--
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package body C460002_0 is
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   procedure Target_Is_Level_0_Nest (Y: access Desig; S: out Result_Kind) is
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      procedure Nested (X: access Desig; R: out Result_Kind) is
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      -- This procedure attempts a type conversion on the access parameter to
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      -- an access type declared at some nesting level.  Program_Error is
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      -- raised if the accessibility level of the operand type is deeper than
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      -- that of the target type.
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130
      begin
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         -- The accessibility level of type Acc_L0 is 0.
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         A0 := Acc_L0(X);
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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 Nested;
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141
   begin
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      Nested (Y, S);
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   end Target_Is_Level_0_Nest;
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145
   -------------------------------------------------------------
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147
   procedure Never_Fails_Nest (Y: access Desig; S: out Result_Kind) is
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149
      type Acc_Deeper is access all Desig;
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      AD : Acc_Deeper;
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152
      function Nested (X: access Desig) return Result_Kind is
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      begin
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         -- The type conversion below will always be safe, since the
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         -- accessibility level (although not necessarily the static nesting
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         -- depth) of Acc_Deeper will always be deeper than or the same as that
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         -- of the actual corresponding to Y.
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         AD := Acc_Deeper(X);
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         if Natural(Ident_Int(AD.C(1))) /= 3 then            --Avoid Optimization of AD
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           Report.Failed ("Initial Values not correct.");
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         end if;
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         return OK;
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      exception
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         when Program_Error =>
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            return P_E;
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         when others        =>
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            return O_E;
168
      end Nested;
169
 
170
   begin
171
      S := Nested (Y);
172
   end Never_Fails_Nest;
173
 
174
   -------------------------------------------------------------
175
 
176
   procedure Called_By_Never_Fails_Same
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     (X: access Desig; R: out Result_Kind) is
178
      type Acc_Local is access all Desig;
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      AL : Acc_Local;
180
   begin
181
      -- The type conversion below will always be safe, since the
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      -- accessibility level (although not necessarily the static nesting
183
      -- depth) of Acc_Local will always be deeper than or the same as that
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      -- of the actual corresponding to X.
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      AL := Acc_Local(X);
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      if Natural(Ident_Int(AL.C(1))) /= 3 then       --Avoid Optimization of AL
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        Report.Failed ("Initial Values not correct.");
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      end if;
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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;
195
   end Called_By_Never_Fails_Same;
196
 
197
   -------------------------------------------------------------
198
 
199
   procedure Never_Fails_Same (Y: access Desig; S: out Result_Kind) is
200
   begin
201
      Called_By_Never_Fails_Same (Y, S);
202
   end Never_Fails_Same;
203
 
204
end C460002_0;
205
 
206
 
207
     --==================================================================--
208
 
209
 
210
with C460002_0;
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use  C460002_0;
212
 
213
with Report; use Report;
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215
procedure C460002 is
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   type Acc_L1 is access all Desig;                               -- Level = 1.
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   A1 : Acc_L1;
219
   X1 : aliased Desig := (C=>(others => Ident_Int(3)));
220
   Res : Result_Kind;
221
 
222
 
223
 
224
   procedure Called_By_Target_L1 (X: access Desig; R: out Result_Kind) is
225
   begin
226
      -- The accessibility level of type Acc_L1 is 1.
227
      A1 := Acc_L1(X);
228
      if Natural(Ident_Int(A1.C(1))) /= 3 then       --Avoid Optimization of A1
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        Report.Failed ("Initial Values not correct.");
230
      end if;
231
      R  := OK;
232
   exception
233
      when Program_Error =>
234
         R := P_E;
235
      when others        =>
236
         R := O_E;
237
   end Called_By_Target_L1;
238
 
239
   -------------------------------------------------------------
240
 
241
   function Target_Is_Level_1_Same (Y: access Desig) return Result_Kind is
242
      S : Result_Kind;
243
   begin
244
      Called_By_Target_L1 (Y, S);
245
      return S;
246
   end Target_Is_Level_1_Same;
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248
   -------------------------------------------------------------
249
 
250
   procedure Display_Results (Result  : in Result_Kind;
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                              Expected: in Result_Kind;
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                              Msg     : in String) is
253
   begin
254
      if Result /= Expected then
255
         case Result is
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            when OK  => Report.Failed ("No exception raised: "         & Msg);
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            when P_E => Report.Failed ("Program_Error raised: "        & Msg);
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            when O_E => Report.Failed ("Unexpected exception raised: " & Msg);
259
         end case;
260
      end if;
261
   end Display_Results;
262
 
263
begin -- C460002.
264
 
265
   Report.Test ("C460002", "Check that if the target type of a type "      &
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                "conversion is a general access type, Program_Error is "   &
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                "raised if the accessibility level of the operand type "   &
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                "is deeper than that of the target type: operand is an "   &
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                "access parameter; corresponding actual is another "       &
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                "access parameter");
271
 
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273
   -- Accessibility level of actual is 0 (actual is X'Access):
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275
   Never_Fails_Same (X0'Access, Res);
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   Display_Results (Res, OK, "Never_Fails_Same, level 0 actual");
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278
   Never_Fails_Nest (X0'Access, Res);
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   Display_Results (Res, OK, "Target_L1_Nest, level 0 actual");
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281
   Target_Is_Level_0_Nest (X0'Access, Res);
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   Display_Results (Res, OK, "Target_L0_Nest, level 0 actual");
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284
   Res := Target_Is_Level_1_Same (X0'Access);
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   Display_Results (Res, OK, "Target_L1_Same, level 0 actual");
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   -- Accessibility level of actual is 1 (actual is X'Access):
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   Never_Fails_Same (X1'Access, Res);
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   Display_Results (Res, OK, "Never_Fails_Same, level 1 actual");
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293
   Never_Fails_Nest (X1'Access, Res);
294
   Display_Results (Res, OK, "Target_L1_Nest, level 1 actual");
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296
   Target_Is_Level_0_Nest (X1'Access, Res);
297
   Display_Results (Res, P_E, "Target_L0_Nest, level 1 actual");
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299
   Res := Target_Is_Level_1_Same (X1'Access);
300
   Display_Results (Res, OK, "Target_L1_Same, level 1 actual");
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302
 
303
   Block_L2:
304
   declare
305
      X2 : aliased Desig := (C=>(others => Ident_Int(3)));
306
      type Acc_L2 is access all Desig;                            -- Level = 2.
307
      Expr_L2 : Acc_L2 := X2'Access;
308
   begin
309
 
310
      -- Accessibility level of actual is 2 (actual is expression of named
311
      -- access type):
312
 
313
      Never_Fails_Same (Expr_L2, Res);
314
      Display_Results (Res, OK, "Never_Fails_Same, level 2 actual");
315
 
316
      Never_Fails_Nest (Expr_L2, Res);
317
      Display_Results (Res, OK, "Target_L1_Nest, level 2 actual");
318
 
319
      Target_Is_Level_0_Nest (Expr_L2, Res);
320
      Display_Results (Res, P_E, "Target_L0_Nest, level 2 actual");
321
 
322
      Res := Target_Is_Level_1_Same (Expr_L2);
323
      Display_Results (Res, P_E, "Target_L1_Same, level 2 actual");
324
 
325
   end Block_L2;
326
 
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   Report.Result;
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end C460002;

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