1 /* 2 * Copyright (C) 2009 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef PtrAndFlags_h 32 #define PtrAndFlags_h 33 34 #include <wtf/Assertions.h> 35 36 namespace WTF { 37 template<class T, typename FlagEnum> class PtrAndFlags { 38 public: PtrAndFlags()39 PtrAndFlags() : m_ptrAndFlags(0) {} PtrAndFlags(T * ptr)40 PtrAndFlags(T* ptr) : m_ptrAndFlags(0) { set(ptr); } 41 isFlagSet(FlagEnum flagNumber)42 bool isFlagSet(FlagEnum flagNumber) const { ASSERT(flagNumber < 2); return m_ptrAndFlags & (1 << flagNumber); } setFlag(FlagEnum flagNumber)43 void setFlag(FlagEnum flagNumber) { ASSERT(flagNumber < 2); m_ptrAndFlags |= (1 << flagNumber);} clearFlag(FlagEnum flagNumber)44 void clearFlag(FlagEnum flagNumber) { ASSERT(flagNumber < 2); m_ptrAndFlags &= ~(1 << flagNumber);} get()45 T* get() const { return reinterpret_cast<T*>(m_ptrAndFlags & ~3); } set(T * ptr)46 void set(T* ptr) 47 { 48 ASSERT(!(reinterpret_cast<intptr_t>(ptr) & 3)); 49 m_ptrAndFlags = reinterpret_cast<intptr_t>(ptr) | (m_ptrAndFlags & 3); 50 #ifndef NDEBUG 51 m_leaksPtr = ptr; 52 #endif 53 } 54 55 bool operator!() const { return !get(); } 56 T* operator->() const { return reinterpret_cast<T*>(m_ptrAndFlags & ~3); } 57 58 private: 59 intptr_t m_ptrAndFlags; 60 #ifndef NDEBUG 61 void* m_leaksPtr; // Only used to allow tools like leaks on OSX to detect that the memory is referenced. 62 #endif 63 }; 64 } // namespace WTF 65 66 using WTF::PtrAndFlags; 67 68 #endif // PtrAndFlags_h 69