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-- C3A2A01.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, 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;