Source/JavaScriptCore/heap/SimpleMarkingConstraint.h

/*
 * Copyright (C) 2017 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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#pragma once

#include "MarkingConstraint.h"
#include <wtf/Function.h>

namespace JSC {

// This allows for an informal way to define constraints. Just pass a lambda to the constructor. The only
// downside is that this makes it hard for constraints to override any functions in MarkingConstraint
// other than executeImpl. In those cases, just subclass MarkingConstraint.
class SimpleMarkingConstraint : public MarkingConstraint {
public:
    JS_EXPORT_PRIVATE SimpleMarkingConstraint(
        CString abbreviatedName, CString name,
        ::Function<void(SlotVisitor&)>,
        ConstraintVolatility,
        ConstraintConcurrency = ConstraintConcurrency::Concurrent,
        ConstraintParallelism = ConstraintParallelism::Sequential);
    
    SimpleMarkingConstraint(
        CString abbreviatedName, CString name,
        ::Function<void(SlotVisitor&)> func,
        ConstraintVolatility volatility,
        ConstraintParallelism parallelism)
        : SimpleMarkingConstraint(abbreviatedName, name, WTFMove(func), volatility, ConstraintConcurrency::Concurrent, parallelism)
    {
    }
    
    JS_EXPORT_PRIVATE ~SimpleMarkingConstraint();
    
private:
    void executeImpl(SlotVisitor&) override;

    ::Function<void(SlotVisitor&)> m_executeFunction;
};

} // namespace JSC