1/* 2 * Copyright (C) 2014 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 DFGSafepoint_h 27#define DFGSafepoint_h 28 29#if ENABLE(DFG_JIT) 30 31#include <wtf/Vector.h> 32 33namespace JSC { 34 35class SlotVisitor; 36class VM; 37 38namespace DFG { 39 40class Scannable; 41struct Plan; 42 43class Safepoint { 44public: 45 class Result { 46 public: 47 Result() 48 : m_didGetCancelled(false) 49 , m_wasChecked(true) 50 { 51 } 52 53 ~Result(); 54 55 bool didGetCancelled(); 56 57 private: 58 friend class Safepoint; 59 60 bool m_didGetCancelled; 61 bool m_wasChecked; 62 }; 63 64 Safepoint(Plan&, Result&); 65 ~Safepoint(); 66 67 void add(Scannable*); 68 69 void begin(); 70 71 void checkLivenessAndVisitChildren(SlotVisitor&); 72 bool isKnownToBeLiveDuringGC(); 73 void cancel(); 74 75 VM& vm() const; 76 77private: 78 Plan& m_plan; 79 Vector<Scannable*> m_scannables; 80 bool m_didCallBegin; 81 Result& m_result; 82}; 83 84} } // namespace JSC::DFG 85 86#endif // ENABLE(DFG_JIT) 87 88#endif // DFGSafepoint_h 89 90