source: webkit/trunk/JavaScriptCore/runtime/BooleanObject.h@ 48083

Last change on this file since 48083 was 47267, checked in by [email protected], 16 years ago

Devirtualise marking
https://bugs.webkit.org/show_bug.cgi?id=28294

Reviewed by Maciej Stachowiak.

Add a bit to TypeInfo to indicate that an object uses the standard
JSObject::markChildren method. This allows us to devirtualise marking
of most objects (though a branch is still needed). We also add a branch
to identify arrays thus devirtualising marking in that case as well.

In order to make the best use of this devirtualisation I've also reworked
the MarkStack::drain() logic to make the iteration more efficient.

  • Property svn:eol-style set to native
File size: 1.7 KB
Line 
1/*
2 * Copyright (C) 1999-2000 Harri Porten ([email protected])
3 * Copyright (C) 2008 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 Lesser 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 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 */
20
21#ifndef BooleanObject_h
22#define BooleanObject_h
23
24#include "JSWrapperObject.h"
25
26namespace JSC {
27
28 class BooleanObject : public JSWrapperObject {
29 public:
30 explicit BooleanObject(PassRefPtr<Structure>);
31
32 virtual const ClassInfo* classInfo() const { return &info; }
33 static const ClassInfo info;
34
35 static PassRefPtr<Structure> createStructure(JSValue prototype)
36 {
37 return Structure::create(prototype, TypeInfo(ObjectType, HasStandardGetOwnPropertySlot | HasDefaultMark));
38 }
39 };
40
41 BooleanObject* asBooleanObject(JSValue);
42
43 inline BooleanObject* asBooleanObject(JSValue value)
44 {
45 ASSERT(asObject(value)->inherits(&BooleanObject::info));
46 return static_cast<BooleanObject*>(asObject(value));
47 }
48
49} // namespace JSC
50
51#endif // BooleanObject_h
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