1/*
2 * Copyright (C) 2013, 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. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "DFGDesiredWriteBarriers.h"
28
29#if ENABLE(DFG_JIT)
30
31#include "CodeBlock.h"
32#include "JSCInlines.h"
33
34namespace JSC { namespace DFG {
35
36DesiredWriteBarrier::DesiredWriteBarrier(Type type, CodeBlock* codeBlock, unsigned index, JSCell* owner)
37    : m_owner(owner)
38    , m_type(type)
39    , m_codeBlock(codeBlock)
40{
41    m_which.index = index;
42}
43
44DesiredWriteBarrier::DesiredWriteBarrier(Type type, CodeBlock* codeBlock, InlineCallFrame* inlineCallFrame, JSCell* owner)
45    : m_owner(owner)
46    , m_type(type)
47    , m_codeBlock(codeBlock)
48{
49    m_which.inlineCallFrame = inlineCallFrame;
50}
51
52void DesiredWriteBarrier::trigger(VM& vm)
53{
54    switch (m_type) {
55    case ConstantType: {
56        WriteBarrier<Unknown>& barrier = m_codeBlock->constants()[m_which.index];
57        barrier.set(vm, m_owner, barrier.get());
58        return;
59    }
60
61    case InlineCallFrameExecutableType: {
62        InlineCallFrame* inlineCallFrame = m_which.inlineCallFrame;
63        WriteBarrier<ScriptExecutable>& executable = inlineCallFrame->executable;
64        executable.set(vm, m_owner, executable.get());
65        return;
66    } }
67    RELEASE_ASSERT_NOT_REACHED();
68}
69
70void DesiredWriteBarrier::visitChildren(SlotVisitor& visitor)
71{
72    switch (m_type) {
73    case ConstantType: {
74        WriteBarrier<Unknown>& barrier = m_codeBlock->constants()[m_which.index];
75        visitor.append(&barrier);
76        return;
77    }
78
79    case InlineCallFrameExecutableType: {
80        InlineCallFrame* inlineCallFrame = m_which.inlineCallFrame;
81        WriteBarrier<ScriptExecutable>& executable = inlineCallFrame->executable;
82        visitor.append(&executable);
83        return;
84    } }
85    RELEASE_ASSERT_NOT_REACHED();
86}
87
88DesiredWriteBarriers::DesiredWriteBarriers()
89{
90}
91
92DesiredWriteBarriers::~DesiredWriteBarriers()
93{
94}
95
96void DesiredWriteBarriers::trigger(VM& vm)
97{
98    for (unsigned i = 0; i < m_barriers.size(); i++)
99        m_barriers[i].trigger(vm);
100}
101
102void DesiredWriteBarriers::visitChildren(SlotVisitor& visitor)
103{
104    for (unsigned i = 0; i < m_barriers.size(); i++)
105        m_barriers[i].visitChildren(visitor);
106}
107
108} } // namespace JSC::DFG
109
110#endif // ENABLE(DFG_JIT)
111