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/*
* Copyright (C) 2014-2023 Apple Inc. All rights reserved.
* Copyright (C) 2014 Saam Barati. <saambarati1@gmail.com>
*
* 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 "ControlFlowProfiler.h"
#include "VM.h"
#include <wtf/TZoneMallocInlines.h>
namespace JSC {
WTF_MAKE_TZONE_ALLOCATED_IMPL(ControlFlowProfiler);
ControlFlowProfiler::ControlFlowProfiler()
: m_dummyBasicBlock(BasicBlockLocation(-1, -1))
{
}
ControlFlowProfiler::~ControlFlowProfiler()
{
for (const BlockLocationCache& cache : m_sourceIDBuckets.values()) {
for (BasicBlockLocation* block : cache.values())
delete block;
}
}
BasicBlockLocation* ControlFlowProfiler::getBasicBlockLocation(SourceID sourceID, int startOffset, int endOffset)
{
auto addResult = m_sourceIDBuckets.add(sourceID, BlockLocationCache());
BlockLocationCache& blockLocationCache = addResult.iterator->value;
BasicBlockKey key(startOffset, endOffset);
auto addResultForBasicBlock = blockLocationCache.add(key, nullptr);
if (addResultForBasicBlock.isNewEntry)
addResultForBasicBlock.iterator->value = new BasicBlockLocation(startOffset, endOffset);
return addResultForBasicBlock.iterator->value;
}
void ControlFlowProfiler::dumpData() const
{
auto iter = m_sourceIDBuckets.begin();
auto end = m_sourceIDBuckets.end();
for (; iter != end; ++iter) {
dataLog("SourceID: ", iter->key, "\n");
for (const BasicBlockLocation* block : iter->value.values())
block->dumpData();
}
}
Vector<BasicBlockRange> ControlFlowProfiler::getBasicBlocksForSourceID(SourceID sourceID, VM& vm) const
{
Vector<BasicBlockRange> result(0);
auto bucketFindResult = m_sourceIDBuckets.find(sourceID);
if (bucketFindResult == m_sourceIDBuckets.end())
return result;
const BlockLocationCache& cache = bucketFindResult->value;
for (const BasicBlockLocation* block : cache.values()) {
bool hasExecuted = block->hasExecuted();
size_t executionCount = block->executionCount();
const Vector<BasicBlockLocation::Gap>& blockRanges = block->getExecutedRanges();
for (BasicBlockLocation::Gap gap : blockRanges) {
BasicBlockRange range;
range.m_hasExecuted = hasExecuted;
range.m_executionCount = executionCount;
range.m_startOffset = gap.first;
range.m_endOffset = gap.second;
result.append(range);
}
}
const Vector<std::tuple<bool, unsigned, unsigned>>& functionRanges = vm.functionHasExecutedCache()->getFunctionRanges(sourceID);
for (const auto& functionRange : functionRanges) {
BasicBlockRange range;
range.m_hasExecuted = std::get<0>(functionRange);
range.m_startOffset = static_cast<int>(std::get<1>(functionRange));
range.m_endOffset = static_cast<int>(std::get<2>(functionRange));
range.m_executionCount = range.m_hasExecuted ? 1 : 0; // This is a hack. We don't actually count this.
result.append(range);
}
return result;
}
static BasicBlockRange findBasicBlockAtTextOffset(int offset, const Vector<BasicBlockRange>& blocks)
{
int bestDistance = INT_MAX;
BasicBlockRange bestRange;
bestRange.m_startOffset = bestRange.m_endOffset = -1;
bestRange.m_hasExecuted = false; // Suppress MSVC warning.
// Because some ranges may overlap because of function boundaries, make sure to find the smallest range enclosing the offset.
for (BasicBlockRange range : blocks) {
if (range.m_startOffset <= offset && offset <= range.m_endOffset && (range.m_endOffset - range.m_startOffset) < bestDistance) {
RELEASE_ASSERT(range.m_endOffset - range.m_startOffset >= 0);
bestDistance = range.m_endOffset - range.m_startOffset;
bestRange = range;
}
}
RELEASE_ASSERT(bestRange.m_startOffset != -1 && bestRange.m_endOffset != -1);
return bestRange;
}
bool ControlFlowProfiler::hasBasicBlockAtTextOffsetBeenExecuted(int offset, SourceID sourceID, VM& vm)
{
const Vector<BasicBlockRange>& blocks = getBasicBlocksForSourceID(sourceID, vm);
BasicBlockRange range = findBasicBlockAtTextOffset(offset, blocks);
return range.m_hasExecuted;
}
size_t ControlFlowProfiler::basicBlockExecutionCountAtTextOffset(int offset, SourceID sourceID, VM& vm)
{
const Vector<BasicBlockRange>& blocks = getBasicBlocksForSourceID(sourceID, vm);
BasicBlockRange range = findBasicBlockAtTextOffset(offset, blocks);
return range.m_executionCount;
}
} // namespace JSC
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