1/*
2 * Copyright (C) 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#include "config.h"
27#include "UnlinkedMetadataTable.h"
28
29#include "BytecodeStructs.h"
30#include "CodeBlock.h"
31#include "JSCInlines.h"
32#include "OpcodeInlines.h"
33#include "UnlinkedMetadataTableInlines.h"
34#include <wtf/FastMalloc.h>
35
36namespace JSC {
37
38#define JSC_ALIGNMENT_CHECK(size) static_assert(size <= UnlinkedMetadataTable::s_maxMetadataAlignment);
39FOR_EACH_BYTECODE_METADATA_ALIGNMENT(JSC_ALIGNMENT_CHECK)
40#undef JSC_ALIGNMENT_CHECK
41
42void UnlinkedMetadataTable::finalize()
43{
44 ASSERT(!m_isFinalized);
45 m_isFinalized = true;
46 if (!m_hasMetadata) {
47 fastFree(m_rawBuffer);
48 m_rawBuffer = nullptr;
49 return;
50 }
51
52 unsigned offset = s_offset16TableSize;
53 {
54 Offset32* buffer = preprocessBuffer();
55 for (unsigned i = 0; i < s_offsetTableEntries - 1; i++) {
56 unsigned numberOfEntries = buffer[i];
57 if (!numberOfEntries) {
58 buffer[i] = offset;
59 continue;
60 }
61 unsigned alignment = metadataAlignment(static_cast<OpcodeID>(i));
62 offset = roundUpToMultipleOf(alignment, offset);
63 ASSERT(alignment <= s_maxMetadataAlignment);
64 buffer[i] = offset;
65 offset += numberOfEntries * metadataSize(static_cast<OpcodeID>(i));
66 }
67 buffer[s_offsetTableEntries - 1] = offset;
68 m_is32Bit = offset > UINT16_MAX;
69 }
70
71 if (m_is32Bit) {
72 m_rawBuffer = reinterpret_cast<uint8_t*>(fastRealloc(m_rawBuffer, s_offset16TableSize + s_offset32TableSize + sizeof(LinkingData)));
73 memmove(m_rawBuffer + sizeof(LinkingData) + s_offset16TableSize, m_rawBuffer + sizeof(LinkingData), s_offset32TableSize);
74 memset(m_rawBuffer + sizeof(LinkingData), 0, s_offset16TableSize);
75 Offset32* buffer = bitwise_cast<Offset32*>(m_rawBuffer + sizeof(LinkingData) + s_offset16TableSize);
76 // This adjustment does not break the alignment calculated for metadata in the above loop so long as s_offset32TableSize is rounded with 8.
77 for (unsigned i = 0; i < s_offsetTableEntries; i++)
78 buffer[i] += s_offset32TableSize;
79 } else {
80 Offset32* oldBuffer = bitwise_cast<Offset32*>(m_rawBuffer + sizeof(LinkingData));
81 Offset16* buffer = bitwise_cast<Offset16*>(m_rawBuffer + sizeof(LinkingData));
82 for (unsigned i = 0; i < s_offsetTableEntries; i++)
83 buffer[i] = oldBuffer[i];
84 m_rawBuffer = static_cast<uint8_t*>(fastRealloc(m_rawBuffer, s_offset16TableSize + sizeof(LinkingData)));
85 }
86}
87
88} // namespace JSC
89