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-- CD72A02.A

--

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--                                    DISCLAIMER

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--     DISCLOSED ARE AS IS.  THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED

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--*

--

-- OBJECTIVE:

--      Check that the package System.Address_To_Access_Conversions may be

--      instantiated for various composite types.

--

--      Check that To_Pointer and To_Address are inverse operations.

--

--      Check that To_Pointer(X'Address) equals X'Unchecked_Access for an

--      X that allows Unchecked_Access.

--

--      Check that To_Pointer(Null_Address) returns null.

--

-- TEST DESCRIPTION:

--      This test is identical to CD72A01 with the exception that it tests

--      the composite types where CD72A01 tests "simple" types.

--

--      This test checks that the semantics provided in

--      Address_To_Access_Conversions are present and operate

--      within expectations (to the best extent possible in a portable

--      implementation independent fashion).

--

--      The functions Address_To_Hex and Hex_To_Address test the invertability

--      of the To_Integer and To_Address functions, along with a great deal

--      of optimizer chaff and protection from the fact that type

--      Storage_Elements.Integer_Address may be either a modular or a signed

--      integer type.

--

--      This test has some interesting usage paradigms in that users

--      occasionally want to store address information in a transportable

--      fashion, and often resort to some textual representation of values.

--

-- APPLICABILITY CRITERIA:

--      All implementations must attempt to compile this test.

--

--      For implementations validating against Systems Programming Annex (C):

--        this test must execute and report PASSED.

--

--      For implementations not validating against Annex C:

--        this test may report compile time errors at one or more points

--        indicated by "-- ANX-C RQMT", in which case it may be graded as inapplicable.

--        Otherwise, the test must execute and report PASSED.

--

--

-- CHANGE HISTORY:

--      13 JUL 95   SAIC   Initial version (CD72001)

--      08 FEB 96   SAIC   Split from CD72001 by reviewer request for 2.1

--      12 NOV 96   SAIC   Corrected typo in RM ref

--      16 FEB 98   EDS    Modified documentation.

--      22 JAN 02   RLB    Corrected test description.

--!

with Report;

with Impdef;

with FD72A00;

with System.Storage_Elements;

with System.Address_To_Access_Conversions;

procedure CD72A02 is

  use System;

  use FD72A00;

   type Tagged_Record is tagged record

      Value : Natural;

    end record;

    package Class_ATAC is

      new System.Address_To_Access_Conversions(Tagged_Record'Class);

                                                        -- ANX-C RQMT

  use type Class_ATAC.Object_Pointer;

    task type TC_Task_Type is

      entry E;

      entry F;

    end TC_Task_Type;

    package Task_ATAC is

            new System.Address_To_Access_Conversions(TC_Task_Type);

                                                        -- ANX-C RQMT

  use type Task_ATAC.Object_Pointer;

    task body TC_Task_Type is

    begin

      select

        accept E;

      or

        accept F;

          Report.Failed("Task rendezvoused on wrong path");

      end select;

    end TC_Task_Type;

    protected type TC_Protec is

      procedure E;

      procedure F;

    private

      Visited : Boolean := False;

    end TC_Protec;

    package Protected_ATAC is

            new System.Address_To_Access_Conversions(TC_Protec);

                                                        -- ANX-C RQMT

  use type Protected_ATAC.Object_Pointer;

    protected body TC_Protec is

      procedure E is

      begin

        Visited := True;

      end E;

      procedure F is

      begin

        if not Visited then

          Report.Failed("Protected Object took wrong path");

        end if;

      end F;

    end TC_Protec;

    type Test_Cases is ( Tagged_Type, Task_Type,  Protected_Type );

    type Naive_Dynamic_String is access String;

    type String_Store is array(Test_Cases) of Naive_Dynamic_String;

    The_Strings : String_Store;

    -- create several aliased objects with distinct values

    My_Rec  : aliased Tagged_Record := (Value => Natural'Last);

    My_Task : aliased TC_Task_Type;

    My_Prot : aliased TC_Protec;

    use type System.Storage_Elements.Integer_Address;

begin  -- Main test procedure.

   Report.Test ("CD72A02", "Check package " &

                            "System.Address_To_Access_Conversions " &

                            "for composite types" );

    -- take several pointer objects, convert them to addresses, and store

    -- the address as a hexadecimal representation for later reconversion

    The_Strings(Tagged_Type) := new String'(

      Address_To_Hex(Class_ATAC.To_Address(My_Rec'Access)) );

    The_Strings(Task_Type) := new String'(

      Address_To_Hex(Task_ATAC.To_Address(My_Task'Access)) );

    The_Strings(Protected_Type) := new String'(

      Address_To_Hex(Protected_ATAC.To_Address(My_Prot'Access)) );

    -- now, reconvert the hexadecimal address values back to pointers,

    -- and check that the dereferenced pointer still designates the

    -- value placed at that location.  The use of the intermediate

    -- string representation should foil even the cleverest of optimizers

    if Tagged_Record(Class_ATAC.To_Pointer(

                              Hex_To_Address(The_Strings(Tagged_Type))).all)

       /= Tagged_Record'(Value => Natural'Last) then

      Report.Failed("Tagged_Record reconversion");

    end if;

    Task_ATAC.To_Pointer(Hex_To_Address(The_Strings(Task_Type))).E;

    begin

      select        -- allow for task to have completed.

        My_Task.F;  -- should not happen, will call Report.Fail in task

      else

        null;       -- expected case, "Report.Pass;"

      end select;

    exception

      when Tasking_Error => null;  -- task terminated, which is OK

    end;

    Protected_ATAC.To_Pointer(

                           Hex_To_Address(The_Strings(Protected_Type))).E;

    My_Prot.F;    -- checks that call to E occurred

    -- check that the resulting values are equal to the 'Unchecked_Access

    -- of the value

    if Class_ATAC.To_Pointer(Hex_To_Address(The_Strings(Tagged_Type)))

       /= My_Rec'Unchecked_Access then

      Report.Failed("Tagged_Record Unchecked_Access");

    end if;

    if Task_ATAC.To_Pointer(Hex_To_Address(The_Strings(Task_Type)))

       /= My_Task'Unchecked_Access then

      Report.Failed("Task Unchecked_Access");

    end if;

    if Protected_ATAC.To_Pointer(

                           Hex_To_Address(The_Strings(Protected_Type)))

       /= My_Prot'Unchecked_Access then

      Report.Failed("Protected Unchecked_Access");

    end if;

  Report.Result;

end CD72A02;