Move back primary header includes next to config.h
[WebKit-https.git] / Source / JavaScriptCore / heap / JITStubRoutineSet.cpp
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
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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
35 namespace JSC {
36
37 JITStubRoutineSet::JITStubRoutineSet() { }
38 JITStubRoutineSet::~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
56 void 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
71 void JITStubRoutineSet::clearMarks()
72 {
73     for (size_t i = m_listOfRoutines.size(); i--;)
74         m_listOfRoutines[i]->m_mayBeExecuting = false;
75 }
76
77 void 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
88 void 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
112 void 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