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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.
*/
#pragma once
#include "BasicBlockLocation.h"
#include "SourceID.h"
#include <wtf/HashMap.h>
#include <wtf/TZoneMalloc.h>
namespace JSC {
class VM;
struct BasicBlockKey {
BasicBlockKey()
: m_startOffset(-3)
, m_endOffset(-3)
{ }
BasicBlockKey(int startOffset, int endOffset)
: m_startOffset(startOffset)
, m_endOffset(endOffset)
{ }
BasicBlockKey(WTF::HashTableDeletedValueType)
: m_startOffset(-2)
, m_endOffset(-2)
{ }
bool isHashTableDeletedValue() const { return m_startOffset == -2 && m_endOffset == -2; }
friend bool operator==(const BasicBlockKey&, const BasicBlockKey&) = default;
unsigned hash() const { return m_startOffset + m_endOffset + 1; }
int m_startOffset;
int m_endOffset;
};
struct BasicBlockKeyHash {
static unsigned hash(const BasicBlockKey& key) { return key.hash(); }
static bool equal(const BasicBlockKey& a, const BasicBlockKey& b) { return a == b; }
static constexpr bool safeToCompareToEmptyOrDeleted = true;
};
} // namespace JSC
namespace WTF {
template<typename T> struct DefaultHash;
template<> struct DefaultHash<JSC::BasicBlockKey> : JSC::BasicBlockKeyHash { };
template<typename T> struct HashTraits;
template<> struct HashTraits<JSC::BasicBlockKey> : SimpleClassHashTraits<JSC::BasicBlockKey> {
static constexpr bool emptyValueIsZero = false;
};
} // namespace WTF
namespace JSC {
struct BasicBlockRange {
int m_startOffset;
int m_endOffset;
bool m_hasExecuted;
size_t m_executionCount;
};
class ControlFlowProfiler {
WTF_MAKE_TZONE_ALLOCATED(ControlFlowProfiler);
public:
ControlFlowProfiler();
~ControlFlowProfiler();
BasicBlockLocation* getBasicBlockLocation(SourceID, int startOffset, int endOffset);
JS_EXPORT_PRIVATE void dumpData() const;
Vector<BasicBlockRange> getBasicBlocksForSourceID(SourceID, VM&) const;
BasicBlockLocation* dummyBasicBlock() { return &m_dummyBasicBlock; }
JS_EXPORT_PRIVATE bool hasBasicBlockAtTextOffsetBeenExecuted(int, SourceID, VM&); // This function exists for testing.
JS_EXPORT_PRIVATE size_t basicBlockExecutionCountAtTextOffset(int, SourceID, VM&); // This function exists for testing.
private:
typedef UncheckedKeyHashMap<BasicBlockKey, BasicBlockLocation*> BlockLocationCache;
typedef UncheckedKeyHashMap<SourceID, BlockLocationCache> SourceIDBuckets;
SourceIDBuckets m_sourceIDBuckets;
BasicBlockLocation m_dummyBasicBlock;
};
} // namespace JSC
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