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/*
* Copyright (C) 2019-2023 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 "UnlinkedMetadataTable.h"
#include "BytecodeStructs.h"
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace JSC {
DEFINE_ALLOCATOR_WITH_HEAP_IDENTIFIER(MetadataTable);
DEFINE_ALLOCATOR_WITH_HEAP_IDENTIFIER(UnlinkedMetadataTable);
#if CPU(ADDRESS64)
static_assert((UnlinkedMetadataTable::s_maxMetadataAlignment >=
#define JSC_ALIGNMENT_CHECK(size) size) && (size >=
FOR_EACH_BYTECODE_METADATA_ALIGNMENT(JSC_ALIGNMENT_CHECK)
#undef JSC_ALIGNMENT_CHECK
1));
#else
#define JSC_ALIGNMENT_CHECK(size) static_assert(size <= UnlinkedMetadataTable::s_maxMetadataAlignment);
FOR_EACH_BYTECODE_METADATA_ALIGNMENT(JSC_ALIGNMENT_CHECK)
#undef JSC_ALIGNMENT_CHECK
#endif
#if ENABLE(METADATA_STATISTICS)
size_t MetadataStatistics::unlinkedMetadataCount = 0;
size_t MetadataStatistics::size32MetadataCount = 0;
size_t MetadataStatistics::totalMemory = 0;
size_t MetadataStatistics::perOpcodeCount[NUMBER_OF_BYTECODE_WITH_METADATA] { 0 };
size_t MetadataStatistics::numberOfCopiesFromLinking = 0;
size_t MetadataStatistics::linkingCopyMemory = 0;
void MetadataStatistics::reportMetadataStatistics()
{
static constexpr bool verbose = true;
dataLogLn("\nMetadata statistics\n");
totalMemory += unlinkedMetadataCount * sizeof(UnlinkedMetadataTable::LinkingData);
totalMemory += size32MetadataCount * (UnlinkedMetadataTable::s_offset32TableSize);
totalMemory += linkingCopyMemory;
dataLogLn("total memory: ", totalMemory);
if (verbose)
dataLogLn("\t of which due to multiple linked copies: ", linkingCopyMemory);
dataLogLn("# of unlinked metadata tables created: ", unlinkedMetadataCount);
dataLogLn("# of which were 32bit: ", size32MetadataCount);
dataLogLn("# of copies from linking: ", numberOfCopiesFromLinking);
dataLogLn();
if (!verbose)
return;
dataLogLn("Per opcode statistics:");
std::array<unsigned, NUMBER_OF_BYTECODE_WITH_METADATA> opcodeIds;
std::array<size_t, NUMBER_OF_BYTECODE_WITH_METADATA> memoryUsagePerOpcode;
for (unsigned i = 0; i < NUMBER_OF_BYTECODE_WITH_METADATA; ++i) {
opcodeIds[i] = i;
memoryUsagePerOpcode[i] = perOpcodeCount[i] * metadataSize(static_cast<OpcodeID>(i));
}
std::sort(opcodeIds.begin(), opcodeIds.end(), [&](auto a, auto b) {
return memoryUsagePerOpcode[a] > memoryUsagePerOpcode[b];
});
for (unsigned i = 0; i < NUMBER_OF_BYTECODE_WITH_METADATA; ++i) {
auto id = opcodeIds[i];
auto numberOfEntries = perOpcodeCount[id];
if (!numberOfEntries)
continue;
dataLogLn(opcodeNames[id], ":");
dataLogLn("\tnumber of entries: ", numberOfEntries);
dataLogLn("\tmemory usage: ", memoryUsagePerOpcode[id]);
}
}
#endif
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));
ASSERT(alignment <= s_maxMetadataAlignment);
#if CPU(ADDRESS64)
// This is only necessary for the first metadata entry, if the buffer
// is 4-byte aligned and the entry has an alignment requirement of 8
ASSERT(offset == roundUpToMultipleOf(alignment, offset) || offset == s_offset16TableSize);
#endif
offset = roundUpToMultipleOf(alignment, offset);
offset += numberOfEntries * metadataSize(static_cast<OpcodeID>(i));
#if ENABLE(METADATA_STATISTICS)
MetadataStatistics::perOpcodeCount[i] += numberOfEntries;
#endif
}
buffer[s_offsetTableEntries - 1] = offset;
m_is32Bit = offset > UINT16_MAX;
}
#if ENABLE(METADATA_STATISTICS)
MetadataStatistics::unlinkedMetadataCount++;
if (m_is32Bit)
MetadataStatistics::size32MetadataCount++;
MetadataStatistics::totalMemory += offset;
static std::once_flag once;
std::call_once(once, [] {
std::atexit(MetadataStatistics::reportMetadataStatistics);
});
#endif
unsigned valueProfileSize = m_numValueProfiles * sizeof(ValueProfile);
if (m_is32Bit) {
// offset already accounts for s_offset16TableSize
uint8_t* newBuffer = reinterpret_cast_ptr<uint8_t*>(MetadataTableMalloc::malloc(valueProfileSize + sizeof(LinkingData) + s_offset32TableSize + offset));
memset(newBuffer, 0, valueProfileSize + sizeof(LinkingData) + s_offset16TableSize);
memset(newBuffer + valueProfileSize + sizeof(LinkingData) + s_offset16TableSize + s_offset32TableSize, 0, offset - s_offset16TableSize);
Offset32* buffer = std::bit_cast<Offset32*>(newBuffer + valueProfileSize + sizeof(LinkingData) + s_offset16TableSize);
for (unsigned i = 0; i < s_offsetTableEntries; ++i)
buffer[i] = preprocessBuffer()[i] + s_offset32TableSize;
MetadataTableMalloc::free(m_rawBuffer);
m_rawBuffer = newBuffer;
} else {
// offset already accounts for s_offset16TableSize
uint8_t* newBuffer = reinterpret_cast_ptr<uint8_t*>(MetadataTableMalloc::malloc(valueProfileSize + sizeof(LinkingData) + offset));
memset(newBuffer, 0, valueProfileSize + sizeof(LinkingData));
memset(newBuffer + valueProfileSize + sizeof(LinkingData) + s_offset16TableSize, 0, offset - s_offset16TableSize);
Offset16* buffer = std::bit_cast<Offset16*>(newBuffer + valueProfileSize + sizeof(LinkingData));
for (unsigned i = 0; i < s_offsetTableEntries; ++i)
buffer[i] = preprocessBuffer()[i];
MetadataTableMalloc::free(m_rawBuffer);
m_rawBuffer = newBuffer;
}
}
UnlinkedMetadataTable::~UnlinkedMetadataTable()
{
ASSERT(!m_isLinked);
if (m_hasMetadata)
MetadataTableMalloc::free(m_rawBuffer);
}
} // namespace JSC
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
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