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authorLorry Tar Creator <lorry-tar-importer@lorry>2015-05-20 09:56:07 +0000
committerLorry Tar Creator <lorry-tar-importer@lorry>2015-05-20 09:56:07 +0000
commit41386e9cb918eed93b3f13648cbef387e371e451 (patch)
treea97f9d7bd1d9d091833286085f72da9d83fd0606 /Source/JavaScriptCore/runtime/ControlFlowProfiler.cpp
parente15dd966d523731101f70ccf768bba12435a0208 (diff)
downloadWebKitGtk-tarball-41386e9cb918eed93b3f13648cbef387e371e451.tar.gz
webkitgtk-2.4.9webkitgtk-2.4.9
Diffstat (limited to 'Source/JavaScriptCore/runtime/ControlFlowProfiler.cpp')
-rw-r--r--Source/JavaScriptCore/runtime/ControlFlowProfiler.cpp121
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diff --git a/Source/JavaScriptCore/runtime/ControlFlowProfiler.cpp b/Source/JavaScriptCore/runtime/ControlFlowProfiler.cpp
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--- a/Source/JavaScriptCore/runtime/ControlFlowProfiler.cpp
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-/*
- * Copyright (C) 2014 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"
-
-namespace JSC {
-
-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(intptr_t 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(intptr_t 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();
- const Vector<BasicBlockLocation::Gap>& blockRanges = block->getExecutedRanges();
- for (BasicBlockLocation::Gap gap : blockRanges) {
- BasicBlockRange range;
- range.m_hasExecuted = hasExecuted;
- range.m_startOffset = gap.first;
- range.m_endOffset = gap.second;
- result.append(range);
- }
- }
-
- const Vector<std::tuple<bool, unsigned, unsigned>>& unexecutedFunctionRanges = vm.functionHasExecutedCache()->getFunctionRanges(sourceID);
- for (const auto& functionRange : unexecutedFunctionRanges) {
- 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));
- result.append(range);
- }
-
- return result;
-}
-
-bool ControlFlowProfiler::hasBasicBlockAtTextOffsetBeenExecuted(int offset, intptr_t sourceID, VM& vm)
-{
- const Vector<BasicBlockRange>& blocks = getBasicBlocksForSourceID(sourceID, vm);
- 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.m_hasExecuted;
-}
-
-} // namespace JSC