| -- C460A02.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 if the target type of a type conversion is a general |
| -- access type, Program_Error is raised if the accessibility level of |
| -- the operand type is deeper than that of the target type. Check for |
| -- cases where the type conversion occurs in an instance body, and |
| -- the operand type is declared inside the instance or is the anonymous |
| -- access type of an access parameter or access discriminant. |
| -- |
| -- TEST DESCRIPTION: |
| -- In order to satisfy accessibility requirements, the operand type must |
| -- be at the same or a less deep nesting level than the target type -- the |
| -- operand type must "live" as long as the target type. 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 checks for cases where the operand is a component of a |
| -- generic formal object, a stand-alone object, and an access parameter. |
| -- |
| -- The test declares three generic units, each containing an access |
| -- type conversion in which the target type is a formal type: |
| -- |
| -- (1) A generic package in which the operand type is the anonymous |
| -- access type of an access discriminant, and the conversion |
| -- occurs within the declarative part of the body. |
| -- |
| -- (2) A generic package in which the operand type is declared within |
| -- the specification, and the conversion occurs within the |
| -- sequence of statements of the body. |
| -- |
| -- (3) A generic procedure in which the operand type is the anonymous |
| -- access type of an access parameter, and the conversion occurs |
| -- within the sequence of statements. |
| -- |
| -- The test verifies the following: |
| -- |
| -- For (1), Program_Error is raised when the package is instantiated |
| -- if the actual passed through the formal object has an accessibility |
| -- level deeper than that of the target type passed as an actual, and |
| -- that no exception is raised otherwise. The exception is propagated |
| -- to the innermost enclosing master. |
| -- |
| -- For (2), Program_Error is raised when the package is instantiated |
| -- if the package is instantiated at a level deeper than that of the |
| -- target type passed as an actual, and that no exception is raised |
| -- otherwise. The exception is handled within the package body. |
| -- |
| -- For (3), Program_Error is raised when the instance procedure is |
| -- called if the actual passed through the access parameter has an |
| -- accessibility level deeper than that of the target type passed as |
| -- an actual, and that no exception is raised otherwise. The exception |
| -- is handled within the instance procedure. |
| -- |
| -- TEST FILES: |
| -- The following files comprise this test: |
| -- |
| -- F460A00.A |
| -- => C460A02.A |
| -- |
| -- |
| -- CHANGE HISTORY: |
| -- 10 May 95 SAIC Initial prerelease version. |
| -- 24 Apr 96 SAIC Changed the target type formal to be |
| -- access-to-constant; Modified code to avoid dead |
| -- variable optimization. |
| -- |
| --! |
| |
| with F460A00; |
| generic |
| type Target_Type is access all F460A00.Tagged_Type; |
| FObj: in out F460A00.Composite_Type; |
| package C460A02_0 is |
| procedure Dummy; -- Needed to allow package body. |
| end C460A02_0; |
| |
| |
| --==================================================================-- |
| |
| with Report; |
| package body C460A02_0 is |
| Ptr: Target_Type := Target_Type(FObj.D); |
| |
| 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 C460A02_0 instance"); |
| end if; |
| |
| end C460A02_0; |
| |
| |
| --==================================================================-- |
| |
| |
| with F460A00; |
| generic |
| type Designated_Type is private; |
| type Target_Type is access all Designated_Type; |
| FObj : in out Target_Type; |
| FRes : in out F460A00.TC_Result_Kind; |
| package C460A02_1 is |
| type Operand_Type is access Designated_Type; |
| Ptr : Operand_Type := new Designated_Type; |
| |
| procedure Dummy; -- Needed to allow package body. |
| end C460A02_1; |
| |
| |
| --==================================================================-- |
| |
| |
| package body C460A02_1 is |
| procedure Dummy is |
| begin |
| null; |
| end Dummy; |
| begin |
| FRes := F460A00.UN_Init; |
| FObj := Target_Type(Ptr); |
| FRes := F460A00.OK; |
| exception |
| when Program_Error => FRes := F460A00.PE_Exception; |
| when others => FRes := F460A00.Others_Exception; |
| end C460A02_1; |
| |
| |
| --==================================================================-- |
| |
| |
| with F460A00; |
| generic |
| type Designated_Type is new F460A00.Tagged_Type with private; |
| type Target_Type is access constant Designated_Type; |
| procedure C460A02_2 (P : access Designated_Type'Class; |
| Res : out F460A00.TC_Result_Kind); |
| |
| |
| --==================================================================-- |
| |
| |
| with Report; |
| procedure C460A02_2 (P : access Designated_Type'Class; |
| Res : out F460A00.TC_Result_Kind) is |
| Ptr : Target_Type; |
| begin |
| Res := F460A00.UN_Init; |
| Ptr := Target_Type(P); |
| |
| -- Avoid optimization (dead variable removal of Ptr): |
| if not Report.Equal (Ptr.C, Ptr.C) then -- Always false. |
| Report.Failed ("Unexpected error in C460A02_2 instance"); |
| end if; |
| Res := F460A00.OK; |
| exception |
| when Program_Error => Res := F460A00.PE_Exception; |
| when others => Res := F460A00.Others_Exception; |
| end C460A02_2; |
| |
| |
| --==================================================================-- |
| |
| |
| with F460A00; |
| with C460A02_0; |
| with C460A02_1; |
| with C460A02_2; |
| |
| with Report; |
| procedure C460A02 is |
| begin -- C460A02. -- [ Level = 1 ] |
| |
| Report.Test ("C460A02", "Run-time accessibility checks: instance " & |
| "bodies. Operand type of access type conversion is " & |
| "declared inside instance or is anonymous"); |
| |
| |
| SUBTEST1: |
| declare -- [ Level = 2 ] |
| type AccTag_L2 is access all F460A00.Tagged_Type; |
| PTag_L2 : AccTag_L2 := new F460A00.Tagged_Type; |
| Operand_L2 : F460A00.Composite_Type(PTag_L2); |
| |
| Result : F460A00.TC_Result_Kind := F460A00.UN_Init; |
| begin -- SUBTEST1. |
| |
| begin -- [ Level = 3 ] |
| declare -- [ Level = 4 ] |
| -- The accessibility level of the actual passed as the target type |
| -- in Pack_OK is 2. The accessibility level of the composite actual |
| -- (and thus, the level of the anonymous type of the access |
| -- discriminant, which is the same as that of the containing |
| -- object) is also 2. Therefore, the access type conversion in |
| -- Pack_OK does not raise an exception upon instantiation: |
| |
| package Pack_OK is new C460A02_0 |
| (Target_Type => AccTag_L2, FObj => Operand_L2); |
| begin |
| Result := F460A00.OK; -- Expected result. |
| end; |
| exception |
| when Program_Error => Result := F460A00.PE_Exception; |
| when others => Result := F460A00.Others_Exception; |
| end; |
| |
| F460A00.TC_Check_Results (Result, F460A00.OK, "SUBTEST #1"); |
| |
| end SUBTEST1; |
| |
| |
| |
| SUBTEST2: |
| declare -- [ Level = 2 ] |
| type AccTag_L2 is access all F460A00.Tagged_Type; |
| PTag_L2 : AccTag_L2 := new F460A00.Tagged_Type; |
| |
| Result : F460A00.TC_Result_Kind := F460A00.UN_Init; |
| begin -- SUBTEST2. |
| |
| declare -- [ Level = 3 ] |
| Operand_L3 : F460A00.Composite_Type(PTag_L2); |
| begin |
| declare -- [ Level = 4 ] |
| -- The accessibility level of the actual passed as the target type |
| -- in Pack_PE is 2. The accessibility level of the composite actual |
| -- (and thus, the level of the anonymous type of the access |
| -- discriminant, which is the same as that of the containing |
| -- object) is 3. Therefore, the access type conversion in Pack_PE |
| -- propagates Program_Error upon instantiation: |
| |
| package Pack_PE is new C460A02_0 (AccTag_L2, Operand_L3); |
| begin |
| Result := F460A00.OK; |
| end; |
| exception |
| when Program_Error => Result := F460A00.PE_Exception; |
| -- Expected result. |
| when others => Result := F460A00.Others_Exception; |
| end; |
| |
| F460A00.TC_Check_Results (Result, F460A00.PE_Exception, "SUBTEST #2"); |
| |
| end SUBTEST2; |
| |
| |
| |
| SUBTEST3: |
| declare -- [ Level = 2 ] |
| Result : F460A00.TC_Result_Kind := F460A00.UN_Init; |
| begin -- SUBTEST3. |
| |
| declare -- [ Level = 3 ] |
| type AccArr_L3 is access all F460A00.Array_Type; |
| Target: AccArr_L3; |
| |
| -- The accessibility level of the actual passed as the target type |
| -- in Pack_OK is 3. The accessibility level of the operand type is |
| -- that of the instance, which is also 3. Therefore, the access type |
| -- conversion in Pack_OK does not raise an exception upon |
| -- instantiation. If an exception is (incorrectly) raised, it is |
| -- handled within the instance: |
| |
| package Pack_OK is new C460A02_1 |
| (Designated_Type => F460A00.Array_Type, |
| Target_Type => AccArr_L3, |
| FObj => Target, |
| FRes => Result); |
| begin |
| null; |
| end; |
| |
| F460A00.TC_Check_Results (Result, F460A00.OK, "SUBTEST #3"); |
| |
| exception |
| when Program_Error => |
| Report.Failed ("SUBTEST #3: Program_Error incorrectly propagated"); |
| when others => |
| Report.Failed ("SUBTEST #3: Unexpected exception propagated"); |
| end SUBTEST3; |
| |
| |
| |
| SUBTEST4: |
| declare -- [ Level = 2 ] |
| Result : F460A00.TC_Result_Kind := F460A00.UN_Init; |
| begin -- SUBTEST4. |
| |
| declare -- [ Level = 3 ] |
| Target: F460A00.AccArr_L0; |
| |
| -- The accessibility level of the actual passed as the target type |
| -- in Pack_PE is 0. The accessibility level of the operand type is |
| -- that of the instance, which is 3. Therefore, the access type |
| -- conversion in Pack_PE raises Program_Error upon instantiation. |
| -- The exception is handled within the instance: |
| |
| package Pack_PE is new C460A02_1 |
| (Designated_Type => F460A00.Array_Type, |
| Target_Type => F460A00.AccArr_L0, |
| FObj => Target, |
| FRes => Result); |
| begin |
| null; |
| end; |
| |
| F460A00.TC_Check_Results (Result, F460A00.PE_Exception, "SUBTEST #4"); |
| |
| exception |
| when Program_Error => |
| Report.Failed ("SUBTEST #4: Program_Error incorrectly raised"); |
| when others => |
| Report.Failed ("SUBTEST #4: Unexpected exception raised"); |
| end SUBTEST4; |
| |
| |
| |
| SUBTEST5: |
| declare -- [ Level = 2 ] |
| Result : F460A00.TC_Result_Kind := F460A00.UN_Init; |
| begin -- SUBTEST5. |
| |
| declare -- [ Level = 3 ] |
| -- The instantiation of C460A02_2 should NOT result in any |
| -- exceptions. |
| |
| procedure Proc is new C460A02_2 (F460A00.Tagged_Type, |
| F460A00.AccTag_L0); |
| begin |
| -- The accessibility level of the actual passed to Proc is 0. The |
| -- accessibility level of the actual passed as the target type is |
| -- also 0. Therefore, the access type conversion in Proc does not |
| -- raise an exception when the subprogram is called. If an exception |
| -- is (incorrectly) raised, it is handled within the subprogram: |
| |
| Proc (F460A00.PTagClass_L0, Result); |
| end; |
| |
| F460A00.TC_Check_Results (Result, F460A00.OK, "SUBTEST #5"); |
| |
| exception |
| when Program_Error => |
| Report.Failed ("SUBTEST #5: Program_Error incorrectly raised"); |
| when others => |
| Report.Failed ("SUBTEST #5: Unexpected exception raised"); |
| end SUBTEST5; |
| |
| |
| |
| SUBTEST6: |
| declare -- [ Level = 2 ] |
| Result : F460A00.TC_Result_Kind := F460A00.UN_Init; |
| begin -- SUBTEST6. |
| |
| declare -- [ Level = 3 ] |
| -- The instantiation of C460A02_2 should NOT result in any |
| -- exceptions. |
| |
| procedure Proc is new C460A02_2 (F460A00.Tagged_Type, |
| F460A00.AccTag_L0); |
| begin |
| -- In the call to (instantiated) procedure Proc, the first actual |
| -- parameter is an allocator. Its accessibility level is that of |
| -- the level of execution of Proc, which is 3. The accessibility |
| -- level of the actual passed as the target type is 0. Therefore, |
| -- the access type conversion in Proc raises Program_Error when the |
| -- subprogram is called. The exception is handled within the |
| -- subprogram: |
| |
| Proc (new F460A00.Tagged_Type, Result); |
| end; |
| |
| F460A00.TC_Check_Results (Result, F460A00.PE_Exception, "SUBTEST #6"); |
| |
| exception |
| when Program_Error => |
| Report.Failed ("SUBTEST #6: Program_Error incorrectly raised"); |
| when others => |
| Report.Failed ("SUBTEST #6: Unexpected exception raised"); |
| end SUBTEST6; |
| |
| Report.Result; |
| |
| end C460A02; |
