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