1/* 2 * Copyright (C) 2012 Apple 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 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef AbstractPC_h 27#define AbstractPC_h 28 29#include "MacroAssemblerCodeRef.h" 30 31namespace JSC { 32 33class VM; 34class ExecState; 35struct Instruction; 36 37class AbstractPC { 38public: 39 AbstractPC() 40 : m_pointer(0) 41 , m_mode(None) 42 { 43 } 44 45 AbstractPC(VM&, ExecState*); 46 47#if ENABLE(JIT) 48 AbstractPC(ReturnAddressPtr ptr) 49 : m_pointer(ptr.value()) 50 , m_mode(JIT) 51 { 52 } 53 54 bool hasJITReturnAddress() const { return m_mode == JIT; } 55 ReturnAddressPtr jitReturnAddress() const 56 { 57 ASSERT(hasJITReturnAddress()); 58 return ReturnAddressPtr(m_pointer); 59 } 60#endif 61 62 bool isSet() const { return m_mode != None; } 63 bool operator!() const { return !isSet(); } 64 65private: 66 void* m_pointer; 67 68 enum Mode { None, JIT, Interpreter }; 69 Mode m_mode; 70}; 71 72} // namespace JSC 73 74#endif // AbstractPC_h 75 76