/*

 * Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package jdk.vm.ci.code;

import jdk.vm.ci.meta.AllocatableValue;

import jdk.vm.ci.meta.JavaConstant;

import jdk.vm.ci.meta.JavaValue;

import jdk.vm.ci.meta.PlatformKind;

import jdk.vm.ci.meta.Value;

/**

 * Utility class for working with the {@link Value} class and its subclasses.

 */

public final class ValueUtil {

    public static boolean isIllegal(Value value) {

        assert value != null;

        return Value.ILLEGAL.equals(value);

    }

    public static boolean isIllegalJavaValue(JavaValue value) {

        assert value != null;

        return Value.ILLEGAL.equals(value);

    }

    public static boolean isLegal(Value value) {

        return !isIllegal(value);

    }

    public static boolean isVirtualObject(JavaValue value) {

        assert value != null;

        return value instanceof VirtualObject;

    }

    public static VirtualObject asVirtualObject(JavaValue value) {

        assert value != null;

        return (VirtualObject) value;

    }

    public static boolean isConstantJavaValue(JavaValue value) {

        assert value != null;

        return value instanceof JavaConstant;

    }

    public static JavaConstant asConstantJavaValue(JavaValue value) {

        assert value != null;

        return (JavaConstant) value;

    }

    public static boolean isAllocatableValue(Value value) {

        assert value != null;

        return value instanceof AllocatableValue;

    }

    public static AllocatableValue asAllocatableValue(Value value) {

        assert value != null;

        return (AllocatableValue) value;

    }

    public static boolean isStackSlot(Value value) {

        assert value != null;

        return value instanceof StackSlot;

    }

    public static StackSlot asStackSlot(Value value) {

        assert value != null;

        return (StackSlot) value;

    }

    public static boolean isRegister(Value value) {

        assert value != null;

        return value instanceof RegisterValue;

    }

    public static Register asRegister(Value value) {

        return asRegisterValue(value).getRegister();

    }

    public static RegisterValue asRegisterValue(Value value) {

        assert value != null;

        return (RegisterValue) value;

    }

    public static Register asRegister(Value value, PlatformKind kind) {

        if (value.getPlatformKind() != kind) {

            throw new InternalError("needed: " + kind + " got: " + value.getPlatformKind());

        } else {

            return asRegister(value);

        }

    }

}