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source: vbox/trunk/src/libs/xpcom18a4/xpcom/ds/nsAtomTable.h@ 78394

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1/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2/* ***** BEGIN LICENSE BLOCK *****
3 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
4 *
5 * The contents of this file are subject to the Mozilla Public License Version
6 * 1.1 (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 * http://www.mozilla.org/MPL/
9 *
10 * Software distributed under the License is distributed on an "AS IS" basis,
11 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12 * for the specific language governing rights and limitations under the
13 * License.
14 *
15 * The Original Code is mozilla.org code.
16 *
17 * The Initial Developer of the Original Code is
18 * Netscape Communications Corporation.
19 * Portions created by the Initial Developer are Copyright (C) 1998
20 * the Initial Developer. All Rights Reserved.
21 *
22 * Contributor(s):
23 *
24 * Alternatively, the contents of this file may be used under the terms of
25 * either of the GNU General Public License Version 2 or later (the "GPL"),
26 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
27 * in which case the provisions of the GPL or the LGPL are applicable instead
28 * of those above. If you wish to allow use of your version of this file only
29 * under the terms of either the GPL or the LGPL, and not to allow others to
30 * use your version of this file under the terms of the MPL, indicate your
31 * decision by deleting the provisions above and replace them with the notice
32 * and other provisions required by the GPL or the LGPL. If you do not delete
33 * the provisions above, a recipient may use your version of this file under
34 * the terms of any one of the MPL, the GPL or the LGPL.
35 *
36 * ***** END LICENSE BLOCK ***** */
37
38#ifndef nsAtomTable_h__
39#define nsAtomTable_h__
40
41#include "nsIAtom.h"
42
43/**
44 * A threadsafely-refcounted implementation of nsIAtom. Note that
45 * AtomImpl objects are sometimes converted into PermanentAtomImpl
46 * objects using placement new and just overwriting the vtable pointer.
47 */
48
49class AtomImpl : public nsIAtom {
50public:
51 AtomImpl();
52
53protected:
54 // We don't need a virtual destructor here because PermanentAtomImpl
55 // deletions aren't handled through Release().
56 ~AtomImpl();
57
58public:
59 NS_DECL_ISUPPORTS
60 NS_DECL_NSIATOM
61
62 virtual PRBool IsPermanent();
63
64 void* operator new(size_t size, const nsACString& aString) CPP_THROW_NEW;
65
66 void operator delete(void* ptr) {
67 ::operator delete(ptr);
68 }
69
70 // for |#ifdef NS_BUILD_REFCNT_LOGGING| access to reference count
71 nsrefcnt GetRefCount() { return mRefCnt; }
72
73 // Actually more; 0 terminated. This slot is reserved for the
74 // terminating zero.
75 char mString[1];
76};
77
78/**
79 * A non-refcounted implementation of nsIAtom.
80 */
81
82class PermanentAtomImpl : public AtomImpl {
83public:
84#ifdef AIX
85 PermanentAtomImpl() : AtomImpl() {}
86#endif
87 NS_IMETHOD_(nsrefcnt) AddRef();
88 NS_IMETHOD_(nsrefcnt) Release();
89
90 virtual PRBool IsPermanent();
91
92 void* operator new(size_t size, const nsACString& aString) CPP_THROW_NEW {
93 return AtomImpl::operator new(size, aString);
94 }
95 void* operator new(size_t size, AtomImpl* aAtom) CPP_THROW_NEW;
96
97};
98
99void NS_PurgeAtomTable();
100
101#endif // nsAtomTable_h__
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