// -*- mode: c++; c-basic-offset: 4 -*- | |
/* | |
* Copyright (C) 2008 Apple Inc. All rights reserved. | |
* | |
* Redistribution and use in source and binary forms, with or without | |
* modification, are permitted provided that the following conditions | |
* are met: | |
* 1. Redistributions of source code must retain the above copyright | |
* notice, this list of conditions and the following disclaimer. | |
* 2. Redistributions in binary form must reproduce the above copyright | |
* notice, this list of conditions and the following disclaimer in the | |
* documentation and/or other materials provided with the distribution. | |
* | |
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY | |
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR | |
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
*/ | |
#ifndef JSTypeInfo_h | |
#define JSTypeInfo_h | |
// This file would be called TypeInfo.h, but that conflicts with <typeinfo.h> | |
// in the STL on systems without case-sensitive file systems. | |
#include "JSType.h" | |
namespace JSC { | |
// WebCore uses MasqueradesAsUndefined to make document.all and style.filter undetectable. | |
static const unsigned MasqueradesAsUndefined = 1; | |
static const unsigned ImplementsHasInstance = 1 << 1; | |
static const unsigned OverridesHasInstance = 1 << 2; | |
static const unsigned ImplementsDefaultHasInstance = 1 << 3; | |
static const unsigned NeedsThisConversion = 1 << 4; | |
static const unsigned OverridesGetOwnPropertySlot = 1 << 5; | |
static const unsigned OverridesMarkChildren = 1 << 6; | |
static const unsigned OverridesGetPropertyNames = 1 << 7; | |
class TypeInfo { | |
friend class JIT; | |
public: | |
TypeInfo(JSType type, unsigned flags = 0) | |
: m_type(type) | |
{ | |
// ImplementsDefaultHasInstance means (ImplementsHasInstance & !OverridesHasInstance) | |
if ((flags & (ImplementsHasInstance | OverridesHasInstance)) == ImplementsHasInstance) | |
m_flags = flags | ImplementsDefaultHasInstance; | |
else | |
m_flags = flags; | |
} | |
JSType type() const { return m_type; } | |
bool masqueradesAsUndefined() const { return m_flags & MasqueradesAsUndefined; } | |
bool implementsHasInstance() const { return m_flags & ImplementsHasInstance; } | |
bool overridesHasInstance() const { return m_flags & OverridesHasInstance; } | |
bool needsThisConversion() const { return m_flags & NeedsThisConversion; } | |
bool overridesGetOwnPropertySlot() const { return m_flags & OverridesGetOwnPropertySlot; } | |
bool overridesMarkChildren() const { return m_flags & OverridesMarkChildren; } | |
bool overridesGetPropertyNames() const { return m_flags & OverridesGetPropertyNames; } | |
unsigned flags() const { return m_flags; } | |
private: | |
JSType m_type; | |
unsigned m_flags; | |
}; | |
} | |
#endif // JSTypeInfo_h |