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 "GCAwareJITStubRoutine.h"
28
29#if ENABLE(JIT)
30
31#include "Heap.h"
32#include "VM.h"
33#include "JSCInlines.h"
34#include "SlotVisitor.h"
35#include "Structure.h"
36
37namespace JSC {
38
39GCAwareJITStubRoutine::GCAwareJITStubRoutine(
40    const MacroAssemblerCodeRef& code, VM& vm)
41    : JITStubRoutine(code)
42    , m_mayBeExecuting(false)
43    , m_isJettisoned(false)
44{
45    vm.heap.m_jitStubRoutines.add(this);
46}
47
48GCAwareJITStubRoutine::~GCAwareJITStubRoutine() { }
49
50void GCAwareJITStubRoutine::observeZeroRefCount()
51{
52    if (m_isJettisoned) {
53        // This case is needed for when the system shuts down. It may be that
54        // the JIT stub routine set gets deleted before we get around to deleting
55        // this guy. In that case the GC informs us that we're jettisoned already
56        // and that we should delete ourselves as soon as the ref count reaches
57        // zero.
58        delete this;
59        return;
60    }
61
62    RELEASE_ASSERT(!m_refCount);
63
64    m_isJettisoned = true;
65}
66
67void GCAwareJITStubRoutine::deleteFromGC()
68{
69    ASSERT(m_isJettisoned);
70    ASSERT(!m_refCount);
71    ASSERT(!m_mayBeExecuting);
72
73    delete this;
74}
75
76void GCAwareJITStubRoutine::markRequiredObjectsInternal(SlotVisitor&)
77{
78}
79
80MarkingGCAwareJITStubRoutineWithOneObject::MarkingGCAwareJITStubRoutineWithOneObject(
81    const MacroAssemblerCodeRef& code, VM& vm, const JSCell* owner,
82    JSCell* object)
83    : GCAwareJITStubRoutine(code, vm)
84    , m_object(vm, owner, object)
85{
86}
87
88MarkingGCAwareJITStubRoutineWithOneObject::~MarkingGCAwareJITStubRoutineWithOneObject()
89{
90}
91
92void MarkingGCAwareJITStubRoutineWithOneObject::markRequiredObjectsInternal(SlotVisitor& visitor)
93{
94    visitor.append(&m_object);
95}
96
97PassRefPtr<JITStubRoutine> createJITStubRoutine(
98    const MacroAssemblerCodeRef& code,
99    VM& vm,
100    const JSCell* owner,
101    bool makesCalls,
102    JSCell* object)
103{
104    if (!makesCalls)
105        return adoptRef(new JITStubRoutine(code));
106
107    if (!object) {
108        return static_pointer_cast<JITStubRoutine>(
109            adoptRef(new GCAwareJITStubRoutine(code, vm)));
110    }
111
112    return static_pointer_cast<JITStubRoutine>(
113        adoptRef(new MarkingGCAwareJITStubRoutineWithOneObject(code, vm, owner, object)));
114}
115
116} // namespace JSC
117
118#endif // ENABLE(JIT)
119
120