1/*
2 * Copyright (C) 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#pragma once
27
28#include "Opcode.h"
29#include <wtf/Ref.h>
30#include <wtf/RefCounted.h>
31
32namespace JSC {
33
34class MetadataTable;
35
36class UnlinkedMetadataTable : public RefCounted<UnlinkedMetadataTable> {
37 friend class LLIntOffsetsExtractor;
38 friend class MetadataTable;
39 friend class CachedMetadataTable;
40
41public:
42 struct LinkingData {
43 Ref<UnlinkedMetadataTable> unlinkedMetadata;
44 unsigned refCount;
45 };
46
47 ~UnlinkedMetadataTable();
48
49 unsigned addEntry(OpcodeID);
50
51 size_t sizeInBytes();
52
53 void finalize();
54
55 RefPtr<MetadataTable> link();
56
57 static Ref<UnlinkedMetadataTable> create()
58 {
59 return adoptRef(*new UnlinkedMetadataTable);
60 }
61
62private:
63 UnlinkedMetadataTable();
64
65 void unlink(MetadataTable&);
66
67 size_t sizeInBytes(MetadataTable&);
68
69 using Offset = unsigned;
70
71 static constexpr unsigned s_offsetTableEntries = NUMBER_OF_BYTECODE_WITH_METADATA + 1; // one extra entry for the "end" offset;
72 static constexpr unsigned s_offsetTableSize = s_offsetTableEntries * sizeof(UnlinkedMetadataTable::Offset);
73
74 Offset* buffer() const { return bitwise_cast<Offset*>(bitwise_cast<uint8_t*>(m_rawBuffer) + sizeof(LinkingData)); }
75
76 bool m_hasMetadata : 1;
77 bool m_isFinalized : 1;
78 bool m_isLinked : 1;
79 void* m_rawBuffer;
80};
81
82} // namespace JSC
83