1/*
2 * Copyright (C) 2016-2019 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#pragma once
27
28#include "HeapSnapshotBuilder.h"
29#include "TinyBloomFilter.h"
30
31namespace JSC {
32
33class HeapSnapshot {
34 WTF_MAKE_FAST_ALLOCATED;
35public:
36 HeapSnapshot(HeapSnapshot*);
37 ~HeapSnapshot();
38
39 HeapSnapshot* previous() const { return m_previous; }
40
41 void appendNode(const HeapSnapshotNode&);
42 void sweepCell(JSCell*);
43 void shrinkToFit();
44 void finalize();
45
46 bool isEmpty() const { return m_nodes.isEmpty(); }
47 Optional<HeapSnapshotNode> nodeForCell(JSCell*);
48 Optional<HeapSnapshotNode> nodeForObjectIdentifier(unsigned objectIdentifier);
49
50private:
51 friend class HeapSnapshotBuilder;
52 static constexpr intptr_t CellToSweepTag = 1;
53
54 Vector<HeapSnapshotNode> m_nodes;
55 TinyBloomFilter m_filter;
56 HeapSnapshot* m_previous { nullptr };
57 unsigned m_firstObjectIdentifier { 0 };
58 unsigned m_lastObjectIdentifier { 0 };
59 bool m_finalized { false };
60 bool m_hasCellsToSweep { false };
61};
62
63} // namespace JSC
64