142 lines
4.9 KiB
C++
142 lines
4.9 KiB
C++
/*
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* Copyright (C) 2018 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "MetadataTable.h"
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#include "UnlinkedMetadataTable.h"
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#include <wtf/FastMalloc.h>
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namespace JSC {
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ALWAYS_INLINE UnlinkedMetadataTable::UnlinkedMetadataTable()
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: m_hasMetadata(false)
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, m_isFinalized(false)
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, m_isLinked(false)
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, m_is32Bit(false)
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, m_rawBuffer(static_cast<uint8_t*>(MetadataTableMalloc::zeroedMalloc(sizeof(LinkingData) + s_offset32TableSize)))
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{
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}
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ALWAYS_INLINE UnlinkedMetadataTable::UnlinkedMetadataTable(bool is32Bit)
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: m_hasMetadata(false)
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, m_isFinalized(false)
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, m_isLinked(false)
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, m_is32Bit(is32Bit)
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, m_rawBuffer(static_cast<uint8_t*>(MetadataTableMalloc::zeroedMalloc(sizeof(LinkingData) + (is32Bit ? s_offset16TableSize + s_offset32TableSize : s_offset16TableSize))))
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{
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}
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ALWAYS_INLINE UnlinkedMetadataTable::UnlinkedMetadataTable(EmptyTag)
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: m_hasMetadata(false)
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, m_isFinalized(true)
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, m_isLinked(false)
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, m_is32Bit(false)
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, m_rawBuffer(nullptr)
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{
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}
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ALWAYS_INLINE UnlinkedMetadataTable::~UnlinkedMetadataTable()
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{
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ASSERT(!m_isLinked);
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if (m_hasMetadata || !m_isFinalized)
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MetadataTableMalloc::free(m_rawBuffer);
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}
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ALWAYS_INLINE unsigned UnlinkedMetadataTable::addEntry(OpcodeID opcodeID)
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{
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ASSERT(!m_isFinalized && opcodeID < s_offsetTableEntries - 1);
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m_hasMetadata = true;
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return preprocessBuffer()[opcodeID]++;
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}
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ALWAYS_INLINE size_t UnlinkedMetadataTable::sizeInBytes()
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{
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if (m_isFinalized && !m_hasMetadata)
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return 0;
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if (m_is32Bit)
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return s_offset16TableSize + s_offset32TableSize;
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return s_offset16TableSize;
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}
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ALWAYS_INLINE size_t UnlinkedMetadataTable::sizeInBytes(MetadataTable& metadataTable)
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{
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ASSERT(m_isFinalized);
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// In this case, we return the size of the table minus the offset table,
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// which was already accounted for in the UnlinkedCodeBlock.
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// Be careful not to touch m_rawBuffer if this metadataTable is not owning it.
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// It is possible that, m_rawBuffer is realloced in the other thread while we are accessing here.
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size_t result = metadataTable.totalSize();
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if (metadataTable.buffer() == buffer()) {
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ASSERT(m_isLinked);
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if (m_is32Bit)
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return result - (s_offset16TableSize + s_offset32TableSize);
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return result - s_offset16TableSize;
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}
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return result;
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}
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ALWAYS_INLINE RefPtr<MetadataTable> UnlinkedMetadataTable::link()
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{
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ASSERT(m_isFinalized);
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if (!m_hasMetadata)
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return nullptr;
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unsigned totalSize = this->totalSize();
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unsigned offsetTableSize = this->offsetTableSize();
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uint8_t* buffer;
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if (!m_isLinked) {
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m_isLinked = true;
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m_rawBuffer = buffer = reinterpret_cast<uint8_t*>(MetadataTableMalloc::realloc(m_rawBuffer, sizeof(LinkingData) + totalSize));
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} else {
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buffer = reinterpret_cast<uint8_t*>(MetadataTableMalloc::malloc(sizeof(LinkingData) + totalSize));
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memcpy(buffer, m_rawBuffer, sizeof(LinkingData) + offsetTableSize);
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}
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memset(buffer + sizeof(LinkingData) + offsetTableSize, 0, totalSize - offsetTableSize);
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return adoptRef(*new (buffer + sizeof(LinkingData)) MetadataTable(*this));
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}
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ALWAYS_INLINE void UnlinkedMetadataTable::unlink(MetadataTable& metadataTable)
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{
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ASSERT(m_isFinalized);
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if (!m_hasMetadata)
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return;
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if (metadataTable.buffer() == buffer()) {
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ASSERT(m_isLinked);
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m_isLinked = false;
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m_rawBuffer = static_cast<uint8_t*>(MetadataTableMalloc::realloc(m_rawBuffer, sizeof(LinkingData) + offsetTableSize()));
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return;
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}
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MetadataTableMalloc::free(&metadataTable.linkingData());
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}
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} // namespace JSC
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