mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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110 lines
3.8 KiB
C++
110 lines
3.8 KiB
C++
/*
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* Copyright (C) 2014-2019 Apple Inc. All rights reserved.
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* Copyright (C) 2014 Saam Barati. <saambarati1@gmail.com>
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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 "BasicBlockLocation.h"
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#include <wtf/HashMap.h>
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namespace JSC {
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class VM;
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struct BasicBlockKey {
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BasicBlockKey()
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: m_startOffset(-3)
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, m_endOffset(-3)
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{ }
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BasicBlockKey(int startOffset, int endOffset)
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: m_startOffset(startOffset)
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, m_endOffset(endOffset)
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{ }
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BasicBlockKey(WTF::HashTableDeletedValueType)
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: m_startOffset(-2)
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, m_endOffset(-2)
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{ }
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bool isHashTableDeletedValue() const { return m_startOffset == -2 && m_endOffset == -2; }
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bool operator==(const BasicBlockKey& other) const { return m_startOffset == other.m_startOffset && m_endOffset == other.m_endOffset; }
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unsigned hash() const { return m_startOffset + m_endOffset + 1; }
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int m_startOffset;
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int m_endOffset;
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};
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struct BasicBlockKeyHash {
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static unsigned hash(const BasicBlockKey& key) { return key.hash(); }
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static bool equal(const BasicBlockKey& a, const BasicBlockKey& b) { return a == b; }
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static constexpr bool safeToCompareToEmptyOrDeleted = true;
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};
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} // namespace JSC
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namespace WTF {
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template<typename T> struct DefaultHash;
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template<> struct DefaultHash<JSC::BasicBlockKey> : JSC::BasicBlockKeyHash { };
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template<typename T> struct HashTraits;
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template<> struct HashTraits<JSC::BasicBlockKey> : SimpleClassHashTraits<JSC::BasicBlockKey> {
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static constexpr bool emptyValueIsZero = false;
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};
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} // namespace WTF
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namespace JSC {
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struct BasicBlockRange {
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int m_startOffset;
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int m_endOffset;
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bool m_hasExecuted;
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size_t m_executionCount;
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};
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class ControlFlowProfiler {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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ControlFlowProfiler();
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~ControlFlowProfiler();
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BasicBlockLocation* getBasicBlockLocation(intptr_t sourceID, int startOffset, int endOffset);
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JS_EXPORT_PRIVATE void dumpData() const;
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Vector<BasicBlockRange> getBasicBlocksForSourceID(intptr_t sourceID, VM&) const;
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BasicBlockLocation* dummyBasicBlock() { return &m_dummyBasicBlock; }
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JS_EXPORT_PRIVATE bool hasBasicBlockAtTextOffsetBeenExecuted(int, intptr_t, VM&); // This function exists for testing.
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JS_EXPORT_PRIVATE size_t basicBlockExecutionCountAtTextOffset(int, intptr_t, VM&); // This function exists for testing.
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private:
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typedef HashMap<BasicBlockKey, BasicBlockLocation*> BlockLocationCache;
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typedef HashMap<intptr_t, BlockLocationCache> SourceIDBuckets;
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SourceIDBuckets m_sourceIDBuckets;
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BasicBlockLocation m_dummyBasicBlock;
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};
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} // namespace JSC
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