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