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/*
* Copyright (C) 2018-2023 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 "MetadataTable.h"
#include "JSCJSValueInlines.h"
#include "OpcodeInlines.h"
#include "UnlinkedMetadataTableInlines.h"
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace JSC {
MetadataTable::MetadataTable(UnlinkedMetadataTable& unlinkedMetadata)
{
new (&linkingData()) UnlinkedMetadataTable::LinkingData {
unlinkedMetadata,
1,
};
}
struct DeallocTable {
template<typename Op>
static void withOpcodeType(MetadataTable* table)
{
if constexpr (static_cast<unsigned>(Op::opcodeID) < NUMBER_OF_BYTECODE_WITH_METADATA) {
table->forEach<Op>([](auto& entry) {
entry.~Metadata();
});
}
}
};
MetadataTable::~MetadataTable()
{
for (unsigned i = 0; i < NUMBER_OF_BYTECODE_WITH_METADATA; i++)
getOpcodeType<DeallocTable>(static_cast<OpcodeID>(i), this);
linkingData().~LinkingData();
}
void MetadataTable::destroy(MetadataTable* table)
{
// FIXME: This check should really not be necessary, see https://webkit.org/b/272787
if (table->isDestroyed()) {
ASSERT_NOT_REACHED();
return;
}
RefPtr<UnlinkedMetadataTable> unlinkedMetadata = WTFMove(table->linkingData().unlinkedMetadata);
ASSERT(table->isDestroyed());
table->~MetadataTable();
// Since UnlinkedMetadata::unlink frees the underlying memory of MetadataTable.
// We need to destroy LinkingData before calling it.
unlinkedMetadata->unlink(*table);
}
size_t MetadataTable::sizeInBytesForGC()
{
return unlinkedMetadata()->sizeInBytesForGC(*this);
}
void MetadataTable::validate() const
{
auto getOffset = [&](unsigned i) {
unsigned offset = offsetTable16()[i];
if (offset)
return offset;
return offsetTable32()[i];
};
UNUSED_PARAM(getOffset);
ASSERT(getOffset(0) >= (is32Bit() ? UnlinkedMetadataTable::s_offset16TableSize + UnlinkedMetadataTable::s_offset32TableSize : UnlinkedMetadataTable::s_offset16TableSize));
for (unsigned i = 1; i < UnlinkedMetadataTable::s_offsetTableEntries; ++i)
ASSERT(getOffset(i-1) <= getOffset(i));
}
} // namespace JSC
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
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