mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2024-11-26 21:50:53 +00:00
103 lines
3.4 KiB
C++
103 lines
3.4 KiB
C++
/*
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* Copyright (C) 2012, 2013 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 "IndexingType.h"
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#include "JSArray.h"
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namespace JSC {
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class ArrayAllocationProfile {
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public:
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ArrayAllocationProfile() = default;
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ArrayAllocationProfile(IndexingType recommendedIndexingMode)
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{
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initializeIndexingMode(recommendedIndexingMode);
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}
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IndexingType selectIndexingTypeConcurrently()
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{
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return m_currentIndexingType;
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}
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IndexingType selectIndexingType()
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{
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ASSERT(!isCompilationThread());
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JSArray* lastArray = m_lastArray;
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if (lastArray && UNLIKELY(lastArray->indexingType() != m_currentIndexingType))
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updateProfile();
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return m_currentIndexingType;
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}
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// vector length hint becomes [0, BASE_CONTIGUOUS_VECTOR_LEN_MAX].
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unsigned vectorLengthHintConcurrently()
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{
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return m_largestSeenVectorLength;
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}
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unsigned vectorLengthHint()
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{
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ASSERT(!isCompilationThread());
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JSArray* lastArray = m_lastArray;
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if (lastArray && (m_largestSeenVectorLength != BASE_CONTIGUOUS_VECTOR_LEN_MAX) && UNLIKELY(lastArray->getVectorLength() > m_largestSeenVectorLength))
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updateProfile();
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return m_largestSeenVectorLength;
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}
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JSArray* updateLastAllocation(JSArray* lastArray)
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{
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m_lastArray = lastArray;
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return lastArray;
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}
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JS_EXPORT_PRIVATE void updateProfile();
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static IndexingType selectIndexingTypeFor(ArrayAllocationProfile* profile)
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{
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if (!profile)
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return ArrayWithUndecided;
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return profile->selectIndexingType();
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}
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static JSArray* updateLastAllocationFor(ArrayAllocationProfile* profile, JSArray* lastArray)
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{
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if (profile)
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profile->updateLastAllocation(lastArray);
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return lastArray;
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}
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void initializeIndexingMode(IndexingType recommendedIndexingMode) { m_currentIndexingType = recommendedIndexingMode; }
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private:
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IndexingType m_currentIndexingType { ArrayWithUndecided };
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unsigned m_largestSeenVectorLength { 0 };
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JSArray* m_lastArray { nullptr };
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};
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} // namespace JSC
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