| -- CA11002.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 a public child can utilize its parent unit's visible |
| -- definitions. |
| -- |
| -- TEST DESCRIPTION: |
| -- Declare a parent package that contains the following: type, object, |
| -- constant, exception, and subprograms. Declare a public child unit |
| -- that utilizes the components found in the visible part of its parent. |
| -- |
| -- Demonstrate utilization of the following parent components in the |
| -- child package: |
| -- |
| -- Parent |
| -- Type X |
| -- Constant X |
| -- Object X |
| -- Subprogram X |
| -- Exception X |
| -- |
| -- This abstraction simulates a portion of a simple operating system. |
| -- |
| -- |
| -- CHANGE HISTORY: |
| -- 06 Dec 94 SAIC ACVC 2.0 |
| -- |
| --! |
| |
| package CA11002_0 is -- Package OS. |
| |
| type File_Descriptor is new Integer; |
| type File_Mode is (Read_Only, Write_Only, Read_Write); |
| |
| Null_File : constant File_Descriptor := 0; |
| Default_Mode : constant File_Mode := Read_Only; |
| Active_Mode : constant File_Mode := Read_Write; |
| |
| type File_Type is |
| record |
| Descriptor : File_Descriptor := Null_File; |
| Mode : File_Mode := Default_Mode; |
| end record; |
| |
| System_File : File_Type; |
| File_Mode_Error : exception; |
| |
| function Next_Available_File return File_Descriptor; |
| |
| function Mode_Of_File (File : File_Type) return File_Mode; |
| |
| end CA11002_0; -- Package OS. |
| |
| --=================================================================-- |
| |
| package body CA11002_0 is -- Package body OS. |
| |
| File_Count : Integer := 0; |
| |
| function Next_Available_File return File_Descriptor is |
| begin |
| File_Count := File_Count + 1; |
| return (File_Descriptor(File_Count)); -- Type conversion. |
| end Next_Available_File; |
| -------------------------------------------------------------- |
| function Mode_Of_File (File : File_Type) return File_Mode is |
| Mode : File_Mode := File.Mode; |
| begin |
| return (Mode); |
| end Mode_Of_File; |
| |
| end CA11002_0; -- Package body OS. |
| |
| --=================================================================-- |
| |
| package CA11002_0.CA11002_1 is -- Child package OS.Operations. |
| |
| -- Dot qualification of types, objects, etc. from parent is not required |
| -- in a child unit. |
| |
| procedure Create_File (Mode : in File_Mode:= Active_Mode; |
| File : out File_Type); |
| |
| end CA11002_0.CA11002_1; -- Child package OS.Operations. |
| |
| --=================================================================-- |
| |
| with Report; |
| package body CA11002_0.CA11002_1 is -- Child package body OS.Operations. |
| |
| function New_File_Validated (File : File_Type) -- Ensure that a newly |
| return Boolean is -- created file has |
| Result : Boolean := False; -- appropriate values. |
| begin |
| if (File.Descriptor > System_File.Descriptor) and -- Parent object. |
| (File.Mode in File_Mode ) -- Parent type. |
| then |
| Result := True; |
| end if; |
| |
| return (Result); |
| |
| end New_File_Validated; |
| -------------------------------------------------------------- |
| procedure Create_File |
| (Mode : in File_Mode := Active_Mode; -- Parent constant. |
| File : out File_Type) is -- Parent type. |
| |
| New_File : File_Type; |
| |
| begin |
| New_File.Descriptor := Next_Available_File; -- Parent subprogram. |
| New_File.Mode := Mode; |
| |
| if New_File_Validated (File => New_File) then |
| File := New_File; |
| end if; |
| |
| end Create_File; |
| |
| end CA11002_0.CA11002_1; -- Child Package body OS.Operations. |
| |
| --=================================================================-- |
| |
| -- Child library subprogram Convert_File_Mode specification. |
| procedure CA11002_0.CA11002_2 (File : in out File_Type; -- Parent type. |
| New_Mode : in File_Mode); -- Parent type. |
| |
| |
| --=================================================================-- |
| with Report; |
| |
| -- Child library subprogram Convert_File_Mode body. |
| procedure CA11002_0.CA11002_2 (File : in out File_Type; |
| New_Mode : in File_Mode) is |
| begin |
| if File.Mode = New_Mode then |
| raise File_Mode_Error; -- Parent exception. |
| Report.Failed ("Exception not raised in child unit"); |
| else |
| File.Mode := New_Mode; |
| end if; |
| end CA11002_0.CA11002_2; |
| |
| --=================================================================-- |
| |
| with Report; |
| with CA11002_0.CA11002_1; -- Child package OS.Operations. |
| with CA11002_0.CA11002_2; -- Child subprogram OS.Convert_File_Mode, |
| -- Implicitly with parent, OS. |
| use CA11002_0; -- All user-defined operators directly |
| -- visible. |
| procedure CA11002 is |
| begin |
| |
| Report.Test ("CA11002", "Check that a public child can utilize its " & |
| "parent unit's visible definitions"); |
| |
| File_Creation: -- This processing block will demonstrate |
| -- use of child package subroutine that |
| -- takes advantage of components declared |
| -- in the parent package. |
| declare |
| User_File : File_Type; |
| begin |
| CA11002_0.CA11002_1.Create_File (File => User_File); -- Default mode |
| -- parameter used in |
| -- this call. |
| if (User_File.Descriptor = System_File.Descriptor) or |
| (User_File.Mode = Default_Mode) |
| then |
| Report.Failed ("Incorrect file creation"); |
| end if; |
| |
| end File_Creation; |
| |
| -------------------------------------------------------------- |
| File_Mode_Conversion: -- This processing block will demonstrate |
| -- the occurrence of a (forced) exception |
| -- being raised in a child subprogram, and |
| -- propagated to the caller. The exception |
| -- is handled, and the child subprogram |
| -- is called again, this time to perform |
| -- without error. |
| declare |
| procedure Convert_File_Mode (File : in out File_Type; |
| New_Mode : in File_Mode) renames CA11002_0.CA11002_2; |
| New_File : File_Type; |
| begin -- Raise an exception with this |
| -- illegal conversion operation |
| -- (attempt to change to current mode). |
| |
| Convert_File_Mode (File => New_File, |
| New_Mode => Default_Mode); |
| Report.Failed ("Exception should have been raised in child unit"); |
| |
| exception |
| when File_Mode_Error => -- Perform the conversion again, this |
| -- time with a different file mode. |
| |
| Convert_File_Mode (File => New_File, |
| New_Mode => CA11002_0.Active_Mode); |
| |
| if New_File.Mode /= Read_Write then |
| Report.Failed ("Incorrect result from mode conversion operation"); |
| end if; |
| |
| when others => |
| Report.Failed ("Unexpected exception raised in File_Mode_Conversion"); |
| |
| end File_Mode_Conversion; |
| |
| Report.Result; |
| |
| end CA11002; |
