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/*
* Copyright (C) 2017-2023 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. AND ITS CONTRIBUTORS ``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 ITS 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 "ConstraintConcurrency.h"
#include "ConstraintParallelism.h"
#include "ConstraintVolatility.h"
#include <limits.h>
#include <wtf/Lock.h>
#include <wtf/Noncopyable.h>
#include <wtf/SharedTask.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/text/CString.h>
namespace JSC {
class MarkingConstraintSet;
class AbstractSlotVisitor;
class SlotVisitor;
class MarkingConstraint {
WTF_MAKE_NONCOPYABLE(MarkingConstraint);
WTF_MAKE_TZONE_ALLOCATED(MarkingConstraint);
public:
JS_EXPORT_PRIVATE MarkingConstraint(
CString abbreviatedName, CString name, ConstraintVolatility,
ConstraintConcurrency = ConstraintConcurrency::Concurrent,
ConstraintParallelism = ConstraintParallelism::Sequential);
JS_EXPORT_PRIVATE virtual ~MarkingConstraint();
unsigned index() const { return m_index; }
const char* abbreviatedName() const { return m_abbreviatedName.data(); }
const char* name() const { return m_name.data(); }
void resetStats();
size_t lastVisitCount() const { return m_lastVisitCount; }
// The following functions are only used by the real GC via the MarkingConstraintSolver.
// Hence, we only need the SlotVisitor version.
void execute(SlotVisitor&);
JS_EXPORT_PRIVATE virtual double quickWorkEstimate(SlotVisitor&);
double workEstimate(SlotVisitor&);
void prepareToExecute(const AbstractLocker& constraintSolvingLocker, SlotVisitor&);
void doParallelWork(SlotVisitor&, SharedTask<void(SlotVisitor&)>&);
ConstraintVolatility volatility() const { return m_volatility; }
ConstraintConcurrency concurrency() const { return m_concurrency; }
ConstraintParallelism parallelism() const { return m_parallelism; }
protected:
virtual void executeImpl(AbstractSlotVisitor&) = 0;
virtual void executeImpl(SlotVisitor&) = 0;
JS_EXPORT_PRIVATE virtual void prepareToExecuteImpl(const AbstractLocker& constraintSolvingLocker, AbstractSlotVisitor&);
// This function is only used by the verifier GC via Heap::verifyGC().
// Hence, we only need the AbstractSlotVisitor version.
void executeSynchronously(AbstractSlotVisitor&);
private:
friend class MarkingConstraintSet; // So it can set m_index.
CString m_abbreviatedName;
CString m_name;
size_t m_lastVisitCount { 0 };
unsigned m_index { UINT_MAX };
ConstraintVolatility m_volatility;
ConstraintConcurrency m_concurrency;
ConstraintParallelism m_parallelism;
Lock m_lock;
};
} // namespace JSC
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