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jeremybenn |
-- C980003.A
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--
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-- Grant of Unlimited Rights
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--
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-- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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-- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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-- unlimited rights in the software and documentation contained herein.
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-- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
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-- this public release, the Government intends to confer upon all
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-- recipients unlimited rights equal to those held by the Government.
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-- These rights include rights to use, duplicate, release or disclose the
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-- released technical data and computer software in whole or in part, in
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-- any manner and for any purpose whatsoever, and to have or permit others
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-- to do so.
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--
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-- DISCLAIMER
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--
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-- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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-- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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-- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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-- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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-- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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-- PARTICULAR PURPOSE OF SAID MATERIAL.
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--*
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--
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-- TEST OBJECTIVE:
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-- Check that aborts are deferred during the execution of an
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-- Initialize procedure (as the last step of the default
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-- initialization of a controlled object), during the execution
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-- of a Finalize procedure (as part of the finalization of a
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-- controlled object), and during an assignment operation to an
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-- object with a controlled part.
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--
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-- TEST DESCRIPTION:
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-- A controlled type is created with Initialize, Adjust, and
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-- Finalize operations. These operations note in a protected
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-- object when the operation starts and completes. This change
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-- in state of the protected object will open the barrier for
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-- the entry in the protected object.
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-- The test contains declarations of objects of the controlled
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-- type. An asynchronous select is used to attempt to abort
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-- the operations on the controlled type. The asynchronous select
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-- makes use of the state change to the protected object to
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-- trigger the abort.
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--
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--
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-- CHANGE HISTORY:
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-- 11 Jan 96 SAIC Initial Release for 2.1
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-- 5 May 96 SAIC Incorporated Reviewer comments.
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-- 10 Oct 96 SAIC Addressed issue where assignment statement
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-- can be 2 assignment operations.
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--
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--!
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with Ada.Finalization;
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package C980003_0 is
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Verbose : constant Boolean := False;
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-- the following flag is set true whenever the
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-- Initialize operation is called.
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Init_Occurred : Boolean;
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type Is_Controlled is new Ada.Finalization.Controlled with
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record
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Id : Integer;
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end record;
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procedure Initialize (Object : in out Is_Controlled);
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procedure Finalize (Object : in out Is_Controlled);
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procedure Adjust (Object : in out Is_Controlled);
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type States is (Unknown,
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Start_Init, Finished_Init,
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Start_Adjust, Finished_Adjust,
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Start_Final, Finished_Final);
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protected State_Manager is
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procedure Reset;
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procedure Set (New_State : States);
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function Current return States;
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entry Wait_For_Change;
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private
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Current_State : States := Unknown;
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Changed : Boolean := False;
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end State_Manager;
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end C980003_0;
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with Report;
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with ImpDef;
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package body C980003_0 is
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protected body State_Manager is
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procedure Reset is
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begin
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Current_State := Unknown;
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Changed := False;
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end Reset;
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procedure Set (New_State : States) is
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begin
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Changed := True;
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Current_State := New_State;
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end Set;
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function Current return States is
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begin
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return Current_State;
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end Current;
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entry Wait_For_Change when Changed is
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begin
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Changed := False;
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end Wait_For_Change;
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end State_Manager;
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procedure Initialize (Object : in out Is_Controlled) is
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begin
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if Verbose then
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Report.Comment ("starting initialize");
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end if;
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State_Manager.Set (Start_Init);
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if Verbose then
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Report.Comment ("in initialize");
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end if;
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delay ImpDef.Switch_To_New_Task; -- tempting place for abort
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State_Manager.Set (Finished_Init);
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if Verbose then
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Report.Comment ("finished initialize");
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end if;
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Init_Occurred := True;
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end Initialize;
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procedure Finalize (Object : in out Is_Controlled) is
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begin
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if Verbose then
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Report.Comment ("starting finalize");
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end if;
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State_Manager.Set (Start_Final);
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if Verbose then
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Report.Comment ("in finalize");
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end if;
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delay ImpDef.Switch_To_New_Task; -- tempting place for abort
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State_Manager.Set (Finished_Final);
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if Verbose then
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Report.Comment ("finished finalize");
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end if;
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end Finalize;
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procedure Adjust (Object : in out Is_Controlled) is
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begin
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if Verbose then
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Report.Comment ("starting adjust");
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end if;
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State_Manager.Set (Start_Adjust);
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if Verbose then
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Report.Comment ("in adjust");
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end if;
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delay ImpDef.Switch_To_New_Task; -- tempting place for abort
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State_Manager.Set (Finished_Adjust);
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if Verbose then
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Report.Comment ("finished adjust");
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end if;
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end Adjust;
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end C980003_0;
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with Report;
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with ImpDef;
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with C980003_0; use C980003_0;
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with Ada.Unchecked_Deallocation;
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procedure C980003 is
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procedure Check_State (Should_Be : States;
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Msg : String) is
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Cur : States := State_Manager.Current;
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begin
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if Cur /= Should_Be then
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Report.Failed (Msg);
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Report.Comment ("expected: " & States'Image (Should_Be) &
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" found: " & States'Image (Cur));
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elsif Verbose then
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Report.Comment ("passed: " & Msg);
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end if;
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end Check_State;
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begin
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Report.Test ("C980003", "Check that aborts are deferred during" &
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" initialization, finalization, and assignment" &
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" operations on controlled objects");
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Check_State (Unknown, "initial condition");
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-- check that initialization and finalization take place
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Init_Occurred := False;
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select
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State_Manager.Wait_For_Change;
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then abort
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declare
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My_Controlled_Obj : Is_Controlled;
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begin
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delay 0.0; -- abort completion point
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Report.Failed ("state change did not occur");
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end;
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end select;
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if not Init_Occurred then
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Report.Failed ("Initialize did not complete");
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end if;
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Check_State (Finished_Final, "init/final for declared item");
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-- check adjust
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State_Manager.Reset;
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declare
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Source, Dest : Is_Controlled;
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begin
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Check_State (Finished_Init, "adjust initial state");
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Source.Id := 3;
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Dest.Id := 4;
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State_Manager.Reset; -- so we will wait for change
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select
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State_Manager.Wait_For_Change;
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then abort
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Dest := Source;
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end select;
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-- there are two implementation methods for the
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-- assignment statement:
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-- 1. no temporary was used in the assignment statement
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-- thus the entire
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-- assignment statement is abort deferred.
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-- 2. a temporary was used in the assignment statement so
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-- there are two assignment operations. An abort may
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-- occur between the assignment operations
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-- Various optimizations are allowed by 7.6 that can affect
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-- how many times Adjust and Finalize are called.
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-- Depending upon the implementation, the state can be either
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-- Finished_Adjust or Finished_Finalize. If it is any other
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-- state then the abort took place at the wrong time.
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case State_Manager.Current is
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when Finished_Adjust =>
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if Verbose then
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Report.Comment ("assignment aborted after adjust");
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end if;
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when Finished_Final =>
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if Verbose then
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Report.Comment ("assignment aborted after finalize");
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end if;
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when Start_Adjust =>
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Report.Failed ("assignment aborted in adjust");
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when Start_Final =>
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Report.Failed ("assignment aborted in finalize");
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when Start_Init =>
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Report.Failed ("assignment aborted in initialize");
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when Finished_Init =>
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Report.Failed ("assignment aborted after initialize");
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when Unknown =>
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Report.Failed ("assignment aborted in unknown state");
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end case;
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if Dest.Id /= 3 then
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if Verbose then
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Report.Comment ("assignment not performed");
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end if;
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end if;
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end;
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-- check dynamically allocated objects
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State_Manager.Reset;
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declare
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type Pointer_Type is access Is_Controlled;
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procedure Free is new Ada.Unchecked_Deallocation (
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Is_Controlled, Pointer_Type);
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Ptr : Pointer_Type;
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begin
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-- make sure initialize is done when object is allocated
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Ptr := new Is_Controlled;
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Check_State (Finished_Init, "init when item allocated");
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-- now try aborting the finalize
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State_Manager.Reset;
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select
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State_Manager.Wait_For_Change;
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then abort
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Free (Ptr);
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end select;
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Check_State (Finished_Final, "finalization in dealloc");
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end;
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Report.Result;
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end C980003;
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