| // -*- 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) |
| { |
| ASSERT(flags <= 0xFF); |
| ASSERT(type <= 0xFF); |
| // ImplementsDefaultHasInstance means (ImplementsHasInstance & !OverridesHasInstance) |
| if ((flags & (ImplementsHasInstance | OverridesHasInstance)) == ImplementsHasInstance) |
| m_flags = flags | ImplementsDefaultHasInstance; |
| else |
| m_flags = flags; |
| } |
| |
| JSType type() const { return (JSType)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: |
| unsigned char m_type; |
| unsigned char m_flags; |
| }; |
| |
| } |
| |
| #endif // JSTypeInfo_h |