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/*
* Copyright (C) 2014 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 CallEdgeProfile_h
#define CallEdgeProfile_h
#include "CallEdge.h"
#include "CallVariant.h"
#include "ConcurrentJITLock.h"
#include "GPRInfo.h"
#include "JSCell.h"
#include <wtf/OwnPtr.h>
namespace JSC {
class CCallHelpers;
class LLIntOffsetsExtractor;
class CallEdgeLog;
class CallEdgeProfile;
typedef Vector<CallEdgeProfile*, 10> CallEdgeProfileVector;
class CallEdgeProfile {
public:
CallEdgeProfile();
CallEdgeCountType numCallsToNotCell() const { return m_numCallsToNotCell; }
CallEdgeCountType numCallsToUnknownCell() const { return m_numCallsToUnknownCell; }
CallEdgeCountType numCallsToKnownCells() const;
CallEdgeCountType totalCalls() const { return m_totalCount; }
// Call while holding the owning CodeBlock's lock.
CallEdgeList callEdges() const;
void visitWeak();
private:
friend class CallEdgeLog;
static const unsigned maxKnownCallees = 5;
void add(JSValue, CallEdgeProfileVector& mergeBackLog);
bool worthDespecifying();
void addSlow(CallVariant, CallEdgeProfileVector& mergeBackLog);
void mergeBack();
void fadeByHalf();
// It's cheaper to let this have its own lock. It needs to be able to find which lock to
// lock. Normally it would lock the owning CodeBlock's lock, but that would require a
// pointer-width word to point at the CodeBlock. Having the byte-sized lock here is
// cheaper. However, this means that the relationship with the CodeBlock lock is:
// acquire the CodeBlock lock before this one.
mutable ConcurrentJITLock m_lock;
bool m_closuresAreDespecified;
CallEdgeCountType m_numCallsToPrimary;
CallEdgeCountType m_numCallsToNotCell;
CallEdgeCountType m_numCallsToUnknownCell;
CallEdgeCountType m_totalCount;
CallVariant m_primaryCallee;
typedef Spectrum<CallVariant, CallEdgeCountType> CallSpectrum;
struct Secondary {
Vector<CallEdge> m_processed; // Processed but not necessarily sorted.
std::unique_ptr<CallSpectrum> m_temporarySpectrum;
};
std::unique_ptr<Secondary> m_otherCallees;
};
class CallEdgeLog {
public:
CallEdgeLog();
~CallEdgeLog();
static bool isEnabled();
#if ENABLE(JIT)
void emitLogCode(CCallHelpers&, CallEdgeProfile&, JSValueRegs calleeRegs); // Assumes that stack is aligned, all volatile registers - other than calleeGPR - are clobberable, and the parameter space is in use.
// Same as above but creates a CallEdgeProfile instance if one did not already exist. Does
// this in a thread-safe manner by calling OwnPtr::createTransactionally.
void emitLogCode(CCallHelpers&, OwnPtr<CallEdgeProfile>&, JSValueRegs calleeRegs);
#endif // ENABLE(JIT)
void processLog();
private:
friend class LLIntOffsetsExtractor;
static const unsigned logSize = 10000;
struct Entry {
JSValue m_value;
CallEdgeProfile* m_profile;
};
unsigned m_scaledLogIndex;
Entry m_log[logSize];
};
} // namespace JSC
#endif // CallEdgeProfile_h
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