source: webkit/trunk/JavaScriptCore/wtf/OwnFastMallocPtr.h@ 44897

Last change on this file since 44897 was 44145, checked in by [email protected], 16 years ago

JavaScriptCore:

2009-05-25 David Levin <[email protected]>

Reviewed by Maciej Stachowiak and Oliver Hunt.

https://bugs.webkit.org/show_bug.cgi?id=25126
Allow the buffer underlying UString to be shared.

In order to not grow the underlying size of any structure,
there is a union in the Rep string which holds

+ m_sharedBuffer -- a pointer to the shared ref counted buffer

if the class is BaseString and the buffer is being shared OR

+ m_baseString -- the BaseString if the class is only UString::Rep

but not a UString::BaseString

Ideally, m_sharedBuffer would be a RefPtr, but it cannot be because
it is in a union.

No change in sunspider perf.

  • JavaScriptCore.vcproj/WTF/WTF.vcproj:
  • JavaScriptCore.xcodeproj/project.pbxproj:
  • runtime/UString.cpp: (JSC::UString::Rep::share): (JSC::UString::Rep::destroy): (JSC::UString::BaseString::sharedBuffer): (JSC::UString::BaseString::setSharedBuffer): (JSC::UString::BaseString::slowIsBufferReadOnly): (JSC::expandCapacity): (JSC::UString::Rep::reserveCapacity): (JSC::UString::expandPreCapacity): (JSC::concatenate): (JSC::UString::append):
  • runtime/UString.h: (JSC::UString::Rep::Rep): (JSC::UString::Rep::): (JSC::UString::BaseString::isShared): (JSC::UString::BaseString::isBufferReadOnly): (JSC::UString::Rep::baseString):
  • wtf/CrossThreadRefCounted.h: (WTF::CrossThreadRefCounted::isShared):
  • wtf/OwnFastMallocPtr.h: Added. (WTF::OwnFastMallocPtr::OwnFastMallocPtr): (WTF::OwnFastMallocPtr::~OwnFastMallocPtr): (WTF::OwnFastMallocPtr::get): (WTF::OwnFastMallocPtr::release):

JavaScriptGlue:

2009-05-25 David Levin <[email protected]>

Reviewed by Maciej Stachowiak and Oliver Hunt.

https://bugs.webkit.org/show_bug.cgi?id=25126

Added forwarding headers.

  • ForwardingHeaders/wtf/CrossThreadRefCounted.h: Added.
  • ForwardingHeaders/wtf/OwnFastMallocPtr.h: Added.

WebCore:

2009-05-25 David Levin <[email protected]>

Reviewed by Maciej Stachowiak and Oliver Hunt.

Added forwarding headers.

  • ForwardingHeaders/wtf/CrossThreadRefCounted.h: Added.
  • ForwardingHeaders/wtf/OwnFastMallocPtr.h: Added.
File size: 1.5 KB
Line 
1/*
2 * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
3 * Copyright (C) 2009 Google Inc. All rights reserved.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public License
16 * along with this library; see the file COPYING.LIB. If not, write to
17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 *
20 */
21
22#ifndef OwnFastMallocPtr_h
23#define OwnFastMallocPtr_h
24
25#include "FastMalloc.h"
26#include "Noncopyable.h"
27
28namespace WTF {
29
30 template<class T> class OwnFastMallocPtr : Noncopyable {
31 public:
32 explicit OwnFastMallocPtr(T* ptr) : m_ptr(ptr)
33 {
34 }
35
36 ~OwnFastMallocPtr()
37 {
38 fastFree(m_ptr);
39 }
40
41 T* get() const { return m_ptr; }
42 T* release() { T* ptr = m_ptr; m_ptr = 0; return ptr; }
43
44 private:
45 T* m_ptr;
46 };
47
48} // namespace WTF
49
50using WTF::OwnFastMallocPtr;
51
52#endif // OwnFastMallocPtr_h
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