source: webkit/trunk/JavaScriptCore/runtime/JSWrapperObject.h@ 48788

Last change on this file since 48788 was 48403, checked in by [email protected], 16 years ago

Allow anonymous storage inside JSObject
https://bugs.webkit.org/show_bug.cgi?id=29168

Reviewed by Geoff Garen

Add the concept of anonymous slots to Structures so that it is
possible to store references to values that need marking in the
standard JSObject storage buffer. This allows us to reduce the
malloc overhead of some objects (by allowing them to store JS
values in the inline storage of the object) and reduce the
dependence of custom mark functions (if all an objects children
are in the standard object property storage there's no need to
mark them manually).

  • Property svn:eol-style set to native
File size: 2.1 KB
Line 
1/*
2 * Copyright (C) 2006 Maks Orlovich
3 * Copyright (C) 2006, 2007, 2008, 2009 Apple 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 JSWrapperObject_h
23#define JSWrapperObject_h
24
25#include "JSObject.h"
26
27namespace JSC {
28
29 // This class is used as a base for classes such as String,
30 // Number, Boolean and Date which are wrappers for primitive types.
31 class JSWrapperObject : public JSObject {
32 protected:
33 explicit JSWrapperObject(PassRefPtr<Structure>);
34
35 public:
36 JSValue internalValue() const { return m_internalValue; }
37 void setInternalValue(JSValue);
38
39 static PassRefPtr<Structure> createStructure(JSValue prototype)
40 {
41 return Structure::create(prototype, TypeInfo(ObjectType, HasStandardGetOwnPropertySlot | HasDefaultGetPropertyNames | HasDefaultMark));
42 }
43
44 private:
45 virtual void markChildren(MarkStack&);
46
47 JSValue m_internalValue;
48 };
49
50 inline JSWrapperObject::JSWrapperObject(PassRefPtr<Structure> structure)
51 : JSObject(structure)
52 {
53 addAnonymousSlots(1);
54 putAnonymousValue(0, jsNull());
55 }
56
57 inline void JSWrapperObject::setInternalValue(JSValue value)
58 {
59 ASSERT(value);
60 ASSERT(!value.isObject());
61 m_internalValue = value;
62 putAnonymousValue(0, value);
63 }
64
65} // namespace JSC
66
67#endif // JSWrapperObject_h
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