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-- CB41001.A

--

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--*

--

-- OBJECTIVE:

--      Check that the 'Identity attribute returns the unique identity of an

--      exception. Check that the Raise_Exception procedure can raise an

--      exception that is specified through the use of the 'Identity attribute,

--      and that Reraise_Occurrence can re-raise an exception occurrence

--      using an exception choice parameter.

--

-- TEST DESCRIPTION:

--      This test uses the capability of the 'Identity attribute, which

--      returns the unique identity of an exception, as an Exception_Id

--      result.  This result is used as an input parameter to the procedure

--      Raise_Exception.  The exception that results is handled, propagated

--      using the Reraise_Occurrence procedure, and handled again.

--      The above actions are performed for both a user-defined and a

--      predefined exception.

--

--

-- CHANGE HISTORY:

--      06 Dec 94   SAIC    ACVC 2.0

--      11 Nov 96   SAIC    ACVC 2.1: Modified Propagate_User_Exception.

--

--!

with Report;

with Ada.Exceptions;

procedure CB41001 is

begin

   Report.Test ("CB41001", "Check that the 'Identity attribute returns " &

                           "the unique identity of an exception. Check " &

                           "that the 'Identity attribute is of type "    &

                           "Exception_Id.  Check that the "              &

                           "Raise_Exception procedure can raise an "     &

                           "exception that is specified through the "    &

                           "use of the 'Identity attribute");

   Test_Block:

   declare

      Check_Points : constant := 5;

      type Check_Point_Array_Type is array (1..Check_Points) of Boolean;

      -- Global array used to track the processing path through the test.

      TC_Check_Points : Check_Point_Array_Type := (others => False);

      A_User_Defined_Exception  : Exception;

      An_Exception_ID           : Ada.Exceptions.Exception_Id :=

                                    Ada.Exceptions.Null_Id;

      procedure Propagate_User_Exception is

         Hidden_Exception : Exception;

      begin

         -- Use the 'Identity function to store the unique identity of a

         -- user defined exception into a variable of type Exception_Id.

         An_Exception_ID := A_User_Defined_Exception'Identity;

         -- Raise this user defined exception using the result of the

         -- 'Identity attribute.

         Ada.Exceptions.Raise_Exception(E => An_Exception_Id);

         Report.Failed("User defined exception not raised by " &

                       "procedure Propagate_User_Exception");

      exception

         when Proc_Excpt : A_User_Defined_Exception => -- Expected exception.

            begin

               -- By raising a different exception at this point, the

               -- information associated with A_User_Defined_Exception must

               -- be correctly stacked internally.

               Ada.Exceptions.Raise_Exception(Hidden_Exception'Identity);

               Report.Failed("Hidden_Exception not raised by " &

                             "procedure Propagate_User_Exception");

            exception

               when others =>

                  TC_Check_Points(1) := True;

                  -- Reraise the original exception, which will be propagated

                  -- outside the scope of this procedure.

                  Ada.Exceptions.Reraise_Occurrence(Proc_Excpt);

                  Report.Failed("User defined exception not reraised");

            end;

         when others =>

            Report.Failed("Unexpected exception raised by " &

                          "Procedure Propagate_User_Exception");

      end Propagate_User_Exception;

   begin

      User_Exception_Block:

      begin

         -- Call procedure to raise, handle, and reraise a user defined

         -- exception.

         Propagate_User_Exception;

         Report.Failed("User defined exception not propagated from " &

                       "procedure Propagate_User_Exception");

      exception

         when A_User_Defined_Exception => -- Expected exception.

            TC_Check_Points(2) := True;

         when others =>

            Report.Failed

              ("Unexpected exception handled in User_Exception_Block");

      end User_Exception_Block;

      Predefined_Exception_Block:

      begin

         Inner_Block:

         begin

            begin

               -- Use the 'Identity attribute as an input parameter to the

               -- Raise_Exception procedure.

               Ada.Exceptions.Raise_Exception(Constraint_Error'Identity);

               Report.Failed("Constraint_Error not raised in Inner_Block");

            exception

               when Excpt : Constraint_Error =>  -- Expected exception.

                  TC_Check_Points(3) := True;

                  -- Reraise the exception.

                  Ada.Exceptions.Reraise_Occurrence(X => Excpt);

                  Report.Failed("Predefined exception not raised from " &

                                "within the exception handler - 1");

               when others =>

                  Report.Failed("Incorrect result from attempt to raise " &

                                "Constraint_Error using the 'Identity "   &

                                "attribute - 1");

            end;

            Report.Failed("Constraint_Error not reraised in Inner_Block");

         exception

            when Block_Excpt : Constraint_Error =>  -- Expected exception.

               TC_Check_Points(4) := True;

               -- Reraise the exception in a scope where the exception

               -- was not originally raised.

               Ada.Exceptions.Reraise_Occurrence(X => Block_Excpt);

               Report.Failed("Predefined exception not raised from " &

                             "within the exception handler - 2");

            when others =>

               Report.Failed("Incorrect result from attempt to raise " &

                             "Constraint_Error using the 'Identity "   &

                             "attribute - 2");

         end Inner_Block;

         Report.Failed("Exception not propagated from Inner_Block");

      exception

         when Constraint_Error =>  -- Expected exception.

            TC_Check_Points(5) := True;

         when others =>

            Report.Failed("Unexpected exception handled after second " &

                          "reraise of Constraint_Error");

      end Predefined_Exception_Block;

      -- Verify the processing path taken through the test.

      for i in 1..Check_Points loop

         if not TC_Check_Points(i) then

            Report.Failed("Incorrect processing path taken through test, " &

                          "didn't pass check point #" & Integer'Image(i));

         end if;

      end loop;

   exception

      when others => Report.Failed ("Exception raised in Test_Block");

   end Test_Block;

   Report.Result;

end CB41001;