1/*
2 * Copyright (C) 2017 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 "MarkStackMergingConstraint.h"
28
29#include "GCSegmentedArrayInlines.h"
30#include "JSCInlines.h"
31
32namespace JSC {
33
34MarkStackMergingConstraint::MarkStackMergingConstraint(Heap& heap)
35 : MarkingConstraint("Msm", "Mark Stack Merging", ConstraintVolatility::GreyedByExecution)
36 , m_heap(heap)
37{
38}
39
40MarkStackMergingConstraint::~MarkStackMergingConstraint()
41{
42}
43
44double MarkStackMergingConstraint::quickWorkEstimate(SlotVisitor&)
45{
46 return m_heap.m_mutatorMarkStack->size() + m_heap.m_raceMarkStack->size();
47}
48
49void MarkStackMergingConstraint::prepareToExecuteImpl(const AbstractLocker&, SlotVisitor& visitor)
50{
51 // Logging the work here ensures that the constraint solver knows that it doesn't need to produce
52 // anymore work.
53 size_t size = m_heap.m_mutatorMarkStack->size() + m_heap.m_raceMarkStack->size();
54 visitor.addToVisitCount(size);
55
56 if (Options::logGC())
57 dataLog("(", size, ")");
58}
59
60void MarkStackMergingConstraint::executeImpl(SlotVisitor& visitor)
61{
62 m_heap.m_mutatorMarkStack->transferTo(visitor.mutatorMarkStack());
63 m_heap.m_raceMarkStack->transferTo(visitor.mutatorMarkStack());
64}
65
66} // namespace JSC
67
68