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/*
* Copyright (C) 2012 Apple Inc. All rights reserved.
*
* 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.
*/
#ifndef ArrayProfile_h
#define ArrayProfile_h
#include "JSArray.h"
#include "Structure.h"
#include <wtf/HashMap.h>
#include <wtf/SegmentedVector.h>
namespace JSC {
class LLIntOffsetsExtractor;
typedef unsigned ArrayModes;
static const unsigned IsNotArray = 1;
static const unsigned IsJSArray = 2;
inline ArrayModes arrayModeFromStructure(Structure* structure)
{
if (structure->classInfo() == &JSArray::s_info)
return IsJSArray;
return IsNotArray;
}
class ArrayProfile {
public:
ArrayProfile()
: m_bytecodeOffset(std::numeric_limits<unsigned>::max())
, m_lastSeenStructure(0)
, m_expectedStructure(0)
, m_structureIsPolymorphic(false)
, m_observedArrayModes(0)
{
}
ArrayProfile(unsigned bytecodeOffset)
: m_bytecodeOffset(bytecodeOffset)
, m_lastSeenStructure(0)
, m_expectedStructure(0)
, m_structureIsPolymorphic(false)
, m_observedArrayModes(0)
{
}
unsigned bytecodeOffset() const { return m_bytecodeOffset; }
Structure** addressOfLastSeenStructure() { return &m_lastSeenStructure; }
void observeStructure(Structure* structure)
{
m_lastSeenStructure = structure;
}
void computeUpdatedPrediction(OperationInProgress operation = NoOperation);
Structure* expectedStructure() const { return m_expectedStructure; }
bool structureIsPolymorphic() const { return m_structureIsPolymorphic; }
bool hasDefiniteStructure() const
{
return !structureIsPolymorphic() && m_expectedStructure;
}
ArrayModes observedArrayModes() const { return m_observedArrayModes; }
private:
friend class LLIntOffsetsExtractor;
unsigned m_bytecodeOffset;
Structure* m_lastSeenStructure;
Structure* m_expectedStructure;
bool m_structureIsPolymorphic;
ArrayModes m_observedArrayModes;
};
typedef SegmentedVector<ArrayProfile, 4, 0> ArrayProfileVector;
} // namespace JSC
#endif // ArrayProfile_h
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