mirror of
https://github.com/mozilla/gecko-dev.git
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121 lines
3.9 KiB
C++
121 lines
3.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Gecko DOM code.
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*
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* The Initial Developer of the Original Code is
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* Mozilla Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2008
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Peter Van der Beken <peterv@propagandism.org>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsWrapperCache_h___
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#define nsWrapperCache_h___
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#include "nsCycleCollectionParticipant.h"
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struct JSObject;
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typedef PRUptrdiff PtrBits;
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#define NS_WRAPPERCACHE_IID \
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{ 0x3a51ca81, 0xddab, 0x422c, \
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{ 0x95, 0x3a, 0x13, 0x06, 0x28, 0x0e, 0xee, 0x14 } }
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/**
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* Class to store the XPCWrappedNative for an object. This can only be used
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* with objects that only have one XPCWrappedNative at a time (usually ensured
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* by setting an explicit parent in the PreCreate hook for the class). This
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* object can be gotten by calling QueryInterface, note that this breaks XPCOM
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* rules a bit (this object doesn't derive from nsISupports).
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*/
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class nsWrapperCache
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{
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_WRAPPERCACHE_IID)
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nsWrapperCache() : mWrapperPtrBits(0)
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{
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}
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~nsWrapperCache()
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{
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NS_ASSERTION(!PreservingWrapper(),
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"Destroying cache with a preserved wrapper!");
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}
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JSObject* GetWrapper() const
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{
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return reinterpret_cast<JSObject*>(mWrapperPtrBits & ~kWrapperBitMask);
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}
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void SetWrapper(JSObject* aWrapper)
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{
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NS_ASSERTION(!PreservingWrapper(), "Clearing a preserved wrapper!");
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mWrapperPtrBits = reinterpret_cast<PtrBits>(aWrapper);
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}
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void ClearWrapper()
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{
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NS_ASSERTION(!PreservingWrapper(), "Clearing a preserved wrapper!");
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mWrapperPtrBits = 0;
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}
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void SetPreservingWrapper(PRBool aPreserve)
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{
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if(aPreserve) {
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mWrapperPtrBits |= WRAPPER_BIT_PRESERVED;
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}
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else {
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mWrapperPtrBits &= ~WRAPPER_BIT_PRESERVED;
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}
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}
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PRBool PreservingWrapper()
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{
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return mWrapperPtrBits & WRAPPER_BIT_PRESERVED;
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}
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private:
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enum { WRAPPER_BIT_PRESERVED = 1 << 0 };
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enum { kWrapperBitMask = 0x1 };
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PtrBits mWrapperPtrBits;
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(nsWrapperCache, NS_WRAPPERCACHE_IID)
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#define NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY \
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if ( aIID.Equals(NS_GET_IID(nsWrapperCache)) ) { \
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*aInstancePtr = static_cast<nsWrapperCache*>(this); \
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return NS_OK; \
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}
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#endif /* nsWrapperCache_h___ */
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