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/*
* Copyright (C) 2019 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "UnlinkedMetadataTable.h"
#include "BytecodeStructs.h"
namespace JSC {
DEFINE_ALLOCATOR_WITH_HEAP_IDENTIFIER(MetadataTable);
#define JSC_ALIGNMENT_CHECK(size) static_assert(size <= UnlinkedMetadataTable::s_maxMetadataAlignment);
FOR_EACH_BYTECODE_METADATA_ALIGNMENT(JSC_ALIGNMENT_CHECK)
#undef JSC_ALIGNMENT_CHECK
void UnlinkedMetadataTable::finalize()
{
ASSERT(!m_isFinalized);
m_isFinalized = true;
if (!m_hasMetadata) {
MetadataTableMalloc::free(m_rawBuffer);
m_rawBuffer = nullptr;
return;
}
unsigned offset = s_offset16TableSize;
{
Offset32* buffer = preprocessBuffer();
for (unsigned i = 0; i < s_offsetTableEntries - 1; i++) {
unsigned numberOfEntries = buffer[i];
if (!numberOfEntries) {
buffer[i] = offset;
continue;
}
buffer[i] = offset; // We align when we access this.
unsigned alignment = metadataAlignment(static_cast<OpcodeID>(i));
offset = roundUpToMultipleOf(alignment, offset);
ASSERT(alignment <= s_maxMetadataAlignment);
offset += numberOfEntries * metadataSize(static_cast<OpcodeID>(i));
}
buffer[s_offsetTableEntries - 1] = offset;
m_is32Bit = offset > UINT16_MAX;
}
if (m_is32Bit) {
m_rawBuffer = reinterpret_cast<uint8_t*>(MetadataTableMalloc::realloc(m_rawBuffer, s_offset16TableSize + s_offset32TableSize + sizeof(LinkingData)));
memmove(m_rawBuffer + sizeof(LinkingData) + s_offset16TableSize, m_rawBuffer + sizeof(LinkingData), s_offset32TableSize);
memset(m_rawBuffer + sizeof(LinkingData), 0, s_offset16TableSize);
Offset32* buffer = bitwise_cast<Offset32*>(m_rawBuffer + sizeof(LinkingData) + s_offset16TableSize);
// This adjustment does not break the alignment calculated for metadata in the above loop so long as s_offset32TableSize is rounded with 8.
for (unsigned i = 0; i < s_offsetTableEntries; i++)
buffer[i] += s_offset32TableSize;
} else {
Offset32* oldBuffer = bitwise_cast<Offset32*>(m_rawBuffer + sizeof(LinkingData));
Offset16* buffer = bitwise_cast<Offset16*>(m_rawBuffer + sizeof(LinkingData));
for (unsigned i = 0; i < s_offsetTableEntries; i++)
buffer[i] = oldBuffer[i];
m_rawBuffer = static_cast<uint8_t*>(MetadataTableMalloc::realloc(m_rawBuffer, s_offset16TableSize + sizeof(LinkingData)));
}
}
} // namespace JSC
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