Source/JavaScriptCore/domjit/DOMJITEffect.h

/*
 * Copyright (C) 2016 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.
 */

#pragma once

#include "DOMJITHeapRange.h"
#include <wtf/Optional.h>

#if ENABLE(JIT)

namespace JSC { namespace DOMJIT {

struct Effect {
    HeapRange reads { HeapRange::top() };
    HeapRange writes { HeapRange::top() };
    Optional<HeapRange> def;

    static Effect forReadWrite(HeapRange readRange, HeapRange writeRange)
    {
        Effect effect;
        effect.reads = readRange;
        effect.writes = writeRange;
        return effect;
    }

    static Effect forPure()
    {
        Effect effect;
        effect.reads = HeapRange::none();
        effect.writes = HeapRange::none();
        effect.def = HeapRange::none();
        return effect;
    }

    static Effect forDef(HeapRange def)
    {
        Effect effect;
        effect.reads = def;
        effect.writes = HeapRange::none();
        effect.def = def;
        return effect;
    }

    static Effect forDef(HeapRange def, HeapRange readRange, HeapRange writeRange)
    {
        Effect effect;
        effect.reads = readRange;
        effect.writes = writeRange;
        effect.def = def;
        return effect;
    }

    bool mustGenerate() const
    {
        return !!writes;
    }
};

} }

#endif