1/*
2 * Copyright (C) 2017-2018 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 "DOMGCOutputConstraint.h"
28
29#include "WebCoreJSClientData.h"
30#include <JavaScriptCore/BlockDirectoryInlines.h>
31#include <JavaScriptCore/HeapInlines.h>
32#include <JavaScriptCore/HeapSnapshotBuilder.h>
33#include <JavaScriptCore/MarkedBlockInlines.h>
34#include <JavaScriptCore/SubspaceInlines.h>
35#include <JavaScriptCore/VM.h>
36
37namespace WebCore {
38
39using namespace JSC;
40
41DOMGCOutputConstraint::DOMGCOutputConstraint(VM& vm, JSVMClientData& clientData)
42 : MarkingConstraint("Domo", "DOM Output", ConstraintVolatility::SeldomGreyed, ConstraintConcurrency::Concurrent, ConstraintParallelism::Parallel)
43 , m_vm(vm)
44 , m_clientData(clientData)
45 , m_lastExecutionVersion(vm.heap.mutatorExecutionVersion())
46{
47}
48
49DOMGCOutputConstraint::~DOMGCOutputConstraint()
50{
51}
52
53void DOMGCOutputConstraint::executeImpl(SlotVisitor& visitor)
54{
55 Heap& heap = m_vm.heap;
56
57 if (heap.mutatorExecutionVersion() == m_lastExecutionVersion)
58 return;
59
60 m_lastExecutionVersion = heap.mutatorExecutionVersion();
61
62 m_clientData.forEachOutputConstraintSpace(
63 [&] (Subspace& subspace) {
64 auto func = [] (SlotVisitor& visitor, HeapCell* heapCell, HeapCell::Kind) {
65 SetRootMarkReasonScope rootScope(visitor, SlotVisitor::RootMarkReason::DOMGCOutput);
66 JSCell* cell = static_cast<JSCell*>(heapCell);
67 cell->methodTable(visitor.vm())->visitOutputConstraints(cell, visitor);
68 };
69
70 visitor.addParallelConstraintTask(subspace.forEachMarkedCellInParallel(func));
71 });
72}
73
74} // namespace WebCore
75
76