author | Dominic Pinkman <dominic.pinkman@nokia.com> |
Fri, 11 Jun 2010 15:24:34 +0100 | |
changeset 9 | 59758314f811 |
parent 0 | 89d6a7a84779 |
permissions | -rw-r--r-- |
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<?xml version="1.0" encoding="utf-8"?> |
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
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<!-- This component and the accompanying materials are made available under the terms of the License |
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"Eclipse Public License v1.0" which accompanies this distribution, |
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
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<!-- Initial Contributors: |
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Nokia Corporation - initial contribution. |
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Contributors: |
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--> |
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<!DOCTYPE concept |
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PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
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<concept id="GUID-7A71CD0B-84C7-5A77-B573-C61F67C382DA" xml:lang="en"><title>Summary |
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of cleanup rules</title><shortdesc>This document states general rules for cleanup.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p>The general rules for cleanup during the lifetime of an object are:</p> |
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<ul> |
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<li id="GUID-AEE55F10-3FD5-5B09-B025-C5499DE7B312"><p>between the moment the |
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object is allocated, and the moment that a pointer to that object is stored |
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in a structure which would be accessible if a leave occurred, the object must |
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be pushed to the clean-up stack if a leave could possibly occur</p> </li> |
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<li id="GUID-B69DDE00-FE4C-582F-B5FA-0FA7684591F6"><p>when a pointer to the |
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object has been stored in an object which would be accessible if a leave occurred, |
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then the object should be popped from the cleanup stack before a leave could |
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possibly occur: normally, the object is popped first, and then the pointer |
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is stored</p> </li> |
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<li id="GUID-D8D6B31E-0B9F-56C6-B9B0-2197549E78FC"><p>an object is accessible |
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if a leave occurs, if either it is pushed to the cleanup stack, or there is |
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a reference to it from another object which would be accessible if a leave |
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occurred, or there is a reference to it from a stack frame which would not |
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be affected when a leave occurs (because of an appropriately-placed <codeph>TRAP</codeph>), |
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or there is a reference to it from a global variable</p> </li> |
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<li id="GUID-4F508BDB-59D1-52EA-84C2-CABE3E9339EC"><p>it should never be possible |
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to clean up an object more than once, if a leave occurred</p> </li> |
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</ul> |
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<p>In practice, this means that an object must be referred to either by a |
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cleanup stack frame, or by a reference from another object. More rarely, the |
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object may be referred to by a stack frame which cannot be unwound during |
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the lifetime of that object, because of an appropriate <codeph>TRAP</codeph>. |
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More rarely still, the object may be referred to by a global variable.</p> |
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</conbody></concept> |