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--

-- CD72A01.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 simple 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 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   Revised (split) version for 2.1

--      07 MAY 96   SAIC   Additional subtest added for 2.1

--      16 FEB 98   EDS    Modified documentation.

--!

with Report;

with Impdef;

with FD72A00;

with System.Storage_Elements;

with System.Address_To_Access_Conversions;

procedure CD72A01 is

  use System;

  use FD72A00;

  package Number_ATAC is

      new System.Address_To_Access_Conversions(Number); -- ANX-C RQMT

  use type Number_ATAC.Object_Pointer;

  type Data is record

    One, Two: aliased Number;

  end record;

  package Data_ATAC is

      new System.Address_To_Access_Conversions(Data);   -- ANX-C RQMT

  use type Data_ATAC.Object_Pointer;

  type Test_Cases is ( Addr_Type, Record_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_Number : aliased Number := Number'First;

  My_Data   : aliased Data   := (Number'First,Number'Last);

   use type System.Storage_Elements.Integer_Address;

begin  -- Main test procedure.

   Report.Test ("CD72A01", "Check package " &

                            "System.Address_To_Access_Conversions " &

                            "for simple types" );

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

    -- the address as a hexadecimal representation for later reconversion

    The_Strings(Addr_Type) := new String'(

      Address_To_Hex(Number_ATAC.To_Address(My_Number'Access)) );

    The_Strings(Record_Type) := new String'(

      Address_To_Hex(Data_ATAC.To_Address(My_Data'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 Number_ATAC.To_Pointer(

                             Hex_To_Address(The_Strings(Addr_Type))).all

       /= Number'First then

      Report.Failed("Number reconversion");

    end if;

    if Data_ATAC.To_Pointer(Hex_To_Address(The_Strings(Record_Type))).all

       /= (Number'First,Number'Last) then

      Report.Failed("Data reconversion");

    end if;

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

    -- of the value

    if Number_ATAC.To_Pointer(

                             Hex_To_Address(The_Strings(Addr_Type)))

       /= My_Number'Unchecked_Access then

      Report.Failed("Number Unchecked_Access");

    end if;

    if Data_ATAC.To_Pointer(Hex_To_Address(The_Strings(Record_Type)))

       /= My_Data'Unchecked_Access then

      Report.Failed("Data Unchecked_Access");

    end if;

   if Number_ATAC.To_Pointer(System.Null_Address) /= null then

     Report.Failed("To_Pointer(Null_Address) /= null");

   end if;

   if Number_ATAC.To_Address(null) /= System.Null_Address then

     Report.Failed("To_Address(null) /= Null_Address");

   end if;

   Report.Result;

end CD72A01;