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-- CD72A02.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 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;
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