1 // -*- mode: c++; c-basic-offset: 4 -*- 2 /* 3 * Copyright (C) 2008 Apple Inc. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #ifndef TypeInfo_h 28 #define TypeInfo_h 29 30 #include "JSType.h" 31 32 namespace JSC { 33 34 // WebCore uses MasqueradesAsUndefined to make document.all and style.filter undetectable. 35 static const unsigned MasqueradesAsUndefined = 1; 36 static const unsigned ImplementsHasInstance = 1 << 1; 37 static const unsigned OverridesHasInstance = 1 << 2; 38 static const unsigned NeedsThisConversion = 1 << 3; 39 static const unsigned HasStandardGetOwnPropertySlot = 1 << 4; 40 41 class TypeInfo { 42 friend class JIT; 43 public: m_type(type)44 TypeInfo(JSType type, unsigned flags = 0) : m_type(type), m_flags(flags) { } 45 type()46 JSType type() const { return m_type; } 47 masqueradesAsUndefined()48 bool masqueradesAsUndefined() const { return m_flags & MasqueradesAsUndefined; } implementsHasInstance()49 bool implementsHasInstance() const { return m_flags & ImplementsHasInstance; } overridesHasInstance()50 bool overridesHasInstance() const { return m_flags & OverridesHasInstance; } needsThisConversion()51 bool needsThisConversion() const { return m_flags & NeedsThisConversion; } hasStandardGetOwnPropertySlot()52 bool hasStandardGetOwnPropertySlot() const { return m_flags & HasStandardGetOwnPropertySlot; } 53 flags()54 unsigned flags() const { return m_flags; } 55 56 private: 57 JSType m_type; 58 unsigned m_flags; 59 }; 60 61 } 62 63 #endif // TypeInfo_h 64