Source/JavaScriptCore/b3/B3ValueInlines.h

/*
 * Copyright (C) 2015-2016 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

#if ENABLE(B3_JIT)

#include "B3CheckValue.h"
#include "B3Const32Value.h"
#include "B3Const64Value.h"
#include "B3ConstDoubleValue.h"
#include "B3ConstFloatValue.h"
#include "B3PatchpointValue.h"
#include "B3PhiChildren.h"
#include "B3Procedure.h"
#include "B3Value.h"
#include <wtf/GraphNodeWorklist.h>

namespace JSC { namespace B3 {

template<typename BottomProvider>
void Value::replaceWithBottom(const BottomProvider& bottomProvider)
{
    if (m_type == Void) {
        replaceWithNop();
        return;
    }
    
    if (isConstant())
        return;
    
    replaceWithIdentity(bottomProvider(m_origin, m_type));
}

template<typename T>
inline T* Value::as()
{
    if (T::accepts(kind()))
        return static_cast<T*>(this);
    return nullptr;
}

template<typename T>
inline const T* Value::as() const
{
    return const_cast<Value*>(this)->as<T>();
}

inline bool Value::isConstant() const
{
    return B3::isConstant(opcode());
}

inline bool Value::isInteger() const
{
    return type() == Int32 || type() == Int64;
}

inline bool Value::hasInt32() const
{
    return !!as<Const32Value>();
}

inline int32_t Value::asInt32() const
{
    return as<Const32Value>()->value();
}

inline bool Value::isInt32(int32_t value) const
{
    return hasInt32() && asInt32() == value;
}

inline bool Value::hasInt64() const
{
    return !!as<Const64Value>();
}

inline int64_t Value::asInt64() const
{
    return as<Const64Value>()->value();
}

inline bool Value::isInt64(int64_t value) const
{
    return hasInt64() && asInt64() == value;
}

inline bool Value::hasInt() const
{
    return hasInt32() || hasInt64();
}

inline int64_t Value::asInt() const
{
    return hasInt32() ? asInt32() : asInt64();
}

inline bool Value::isInt(int64_t value) const
{
    return hasInt() && asInt() == value;
}

inline bool Value::hasIntPtr() const
{
    if (is64Bit())
        return hasInt64();
    return hasInt32();
}

inline intptr_t Value::asIntPtr() const
{
    if (is64Bit())
        return asInt64();
    return asInt32();
}

inline bool Value::isIntPtr(intptr_t value) const
{
    return hasIntPtr() && asIntPtr() == value;
}

inline bool Value::hasDouble() const
{
    return !!as<ConstDoubleValue>();
}

inline double Value::asDouble() const
{
    return as<ConstDoubleValue>()->value();
}

inline bool Value::isEqualToDouble(double value) const
{
    return hasDouble() && asDouble() == value;
}

inline bool Value::hasFloat() const
{
    return !!as<ConstFloatValue>();
}

inline float Value::asFloat() const
{
    return as<ConstFloatValue>()->value();
}

inline bool Value::hasNumber() const
{
    return hasInt() || hasDouble() || hasFloat();
}

inline bool Value::isNegativeZero() const
{
    if (hasDouble()) {
        double value = asDouble();
        return !value && std::signbit(value);
    }
    if (hasFloat()) {
        float value = asFloat();
        return !value && std::signbit(value);
    }
    return false;
}

template<typename T>
inline bool Value::isRepresentableAs() const
{
    switch (opcode()) {
    case Const32:
        return B3::isRepresentableAs<T>(asInt32());
    case Const64:
        return B3::isRepresentableAs<T>(asInt64());
    case ConstDouble:
        return B3::isRepresentableAs<T>(asDouble());
    case ConstFloat:
        return B3::isRepresentableAs<T>(asFloat());
    default:
        return false;
    }
}

template<typename T>
inline T Value::asNumber() const
{
    switch (opcode()) {
    case Const32:
        return static_cast<T>(asInt32());
    case Const64:
        return static_cast<T>(asInt64());
    case ConstDouble:
        return static_cast<T>(asDouble());
    case ConstFloat:
        return static_cast<T>(asFloat());
    default:
        return T();
    }
}

template<typename Functor>
void Value::walk(const Functor& functor, PhiChildren* phiChildren)
{
    GraphNodeWorklist<Value*> worklist;
    worklist.push(this);
    while (Value* value = worklist.pop()) {
        WalkStatus status = functor(value);
        switch (status) {
        case Continue:
            if (value->opcode() == Phi) {
                if (phiChildren)
                    worklist.pushAll(phiChildren->at(value).values());
            } else
                worklist.pushAll(value->children());
            break;
        case IgnoreChildren:
            break;
        case Stop:
            return;
        }
    }
}

} } // namespace JSC::B3

#endif // ENABLE(B3_JIT)