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--
-- CD72A01.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 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;
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