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#include "config.h" 27#include "JITStubRoutineSet.h" 28 29#if ENABLE(JIT) 30 31#include "GCAwareJITStubRoutine.h" 32#include "JSCInlines.h" 33#include "SlotVisitor.h" 34 35namespace JSC { 36 37JITStubRoutineSet::JITStubRoutineSet() { } 38JITStubRoutineSet::~JITStubRoutineSet() 39{ 40 for (size_t i = m_listOfRoutines.size(); i--;) { 41 GCAwareJITStubRoutine* routine = m_listOfRoutines[i]; 42 43 routine->m_mayBeExecuting = false; 44 45 if (!routine->m_isJettisoned) { 46 // Inform the deref() routine that it should delete this guy as soon 47 // as the ref count reaches zero. 48 routine->m_isJettisoned = true; 49 continue; 50 } 51 52 routine->deleteFromGC(); 53 } 54} 55 56void JITStubRoutineSet::add(GCAwareJITStubRoutine* routine) 57{ 58 ASSERT(!routine->m_isJettisoned); 59 60 m_listOfRoutines.append(routine); 61 62 uintptr_t start = routine->startAddress(); 63 uintptr_t end = routine->endAddress(); 64 uintptr_t step = JITStubRoutine::addressStep(); 65 for (uintptr_t iter = start; iter < end; iter += step) { 66 ASSERT(m_addressToRoutineMap.find(iter) == m_addressToRoutineMap.end()); 67 m_addressToRoutineMap.add(iter, routine); 68 } 69} 70 71void JITStubRoutineSet::clearMarks() 72{ 73 for (size_t i = m_listOfRoutines.size(); i--;) 74 m_listOfRoutines[i]->m_mayBeExecuting = false; 75} 76 77void JITStubRoutineSet::markSlow(uintptr_t address) 78{ 79 HashMap<uintptr_t, GCAwareJITStubRoutine*>::iterator iter = 80 m_addressToRoutineMap.find(address & ~(JITStubRoutine::addressStep() - 1)); 81 82 if (iter == m_addressToRoutineMap.end()) 83 return; 84 85 iter->value->m_mayBeExecuting = true; 86} 87 88void JITStubRoutineSet::deleteUnmarkedJettisonedStubRoutines() 89{ 90 for (size_t i = 0; i < m_listOfRoutines.size(); i++) { 91 GCAwareJITStubRoutine* routine = m_listOfRoutines[i]; 92 if (!routine->m_isJettisoned || routine->m_mayBeExecuting) 93 continue; 94 95 uintptr_t start = routine->startAddress(); 96 uintptr_t end = routine->endAddress(); 97 uintptr_t step = JITStubRoutine::addressStep(); 98 for (uintptr_t iter = start; iter < end; iter += step) { 99 ASSERT(m_addressToRoutineMap.find(iter) != m_addressToRoutineMap.end()); 100 ASSERT(m_addressToRoutineMap.find(iter)->value == routine); 101 m_addressToRoutineMap.remove(iter); 102 } 103 104 routine->deleteFromGC(); 105 106 m_listOfRoutines[i] = m_listOfRoutines.last(); 107 m_listOfRoutines.removeLast(); 108 i--; 109 } 110} 111 112void JITStubRoutineSet::traceMarkedStubRoutines(SlotVisitor& visitor) 113{ 114 for (size_t i = m_listOfRoutines.size(); i--;) { 115 GCAwareJITStubRoutine* routine = m_listOfRoutines[i]; 116 if (!routine->m_mayBeExecuting) 117 continue; 118 119 routine->markRequiredObjects(visitor); 120 } 121} 122 123} // namespace JSC 124 125#endif // ENABLE(JIT) 126 127