1/*
2 * Copyright (C) 2011 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 "DFGCodeBlocks.h"
28
29#include "CodeBlock.h"
30#include "SlotVisitor.h"
31#include <wtf/Vector.h>
32
33namespace JSC {
34
35#if ENABLE(DFG_JIT)
36
37DFGCodeBlocks::DFGCodeBlocks() { }
38
39DFGCodeBlocks::~DFGCodeBlocks()
40{
41    Vector<OwnPtr<CodeBlock>, 16> toRemove;
42
43    for (HashSet<CodeBlock*>::iterator iter = m_set.begin(); iter != m_set.end(); ++iter) {
44        if ((*iter)->m_dfgData->isJettisoned)
45            toRemove.append(adoptPtr(*iter));
46    }
47}
48
49void DFGCodeBlocks::jettison(PassOwnPtr<CodeBlock> codeBlockPtr)
50{
51    // We don't want to delete it now; we just want its pointer.
52    CodeBlock* codeBlock = codeBlockPtr.leakPtr();
53
54    ASSERT(codeBlock);
55    ASSERT(codeBlock->getJITType() == JITCode::DFGJIT);
56
57    // It should not have already been jettisoned.
58    ASSERT(!codeBlock->m_dfgData->isJettisoned);
59
60    // We should have this block already.
61    ASSERT(m_set.find(codeBlock) != m_set.end());
62
63    codeBlock->m_dfgData->isJettisoned = true;
64}
65
66void DFGCodeBlocks::clearMarks()
67{
68    for (HashSet<CodeBlock*>::iterator iter = m_set.begin(); iter != m_set.end(); ++iter) {
69        (*iter)->m_dfgData->mayBeExecuting = false;
70        (*iter)->m_dfgData->visitAggregateHasBeenCalled = false;
71    }
72}
73
74void DFGCodeBlocks::deleteUnmarkedJettisonedCodeBlocks()
75{
76    Vector<OwnPtr<CodeBlock>, 16> toRemove;
77
78    for (HashSet<CodeBlock*>::iterator iter = m_set.begin(); iter != m_set.end(); ++iter) {
79        if ((*iter)->m_dfgData->isJettisoned && !(*iter)->m_dfgData->mayBeExecuting)
80            toRemove.append(adoptPtr(*iter));
81    }
82}
83
84void DFGCodeBlocks::traceMarkedCodeBlocks(SlotVisitor& visitor)
85{
86    for (HashSet<CodeBlock*>::iterator iter = m_set.begin(); iter != m_set.end(); ++iter) {
87        if ((*iter)->m_dfgData->mayBeExecuting)
88            (*iter)->visitAggregate(visitor);
89    }
90}
91
92#else // ENABLE(DFG_JIT)
93
94void DFGCodeBlocks::jettison(PassOwnPtr<CodeBlock>)
95{
96}
97
98#endif // ENABLE(DFG_JIT)
99
100} // namespace JSC
101
102
103