/*

 * Copyright (c) 2013, 2019, 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 org.graalvm.compiler.replacements.nodes;

import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2;

import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1;

import org.graalvm.compiler.core.common.type.StampFactory;

import org.graalvm.compiler.graph.NodeClass;

import org.graalvm.compiler.nodeinfo.NodeInfo;

import org.graalvm.compiler.nodeinfo.Verbosity;

import org.graalvm.compiler.nodes.FixedWithNextNode;

import org.graalvm.compiler.nodes.ValueNode;

import org.graalvm.compiler.nodes.spi.LIRLowerable;

import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;

import jdk.vm.ci.code.Register;

import jdk.vm.ci.meta.Value;

/**

 * Changes the value of a specific register.

 */

@NodeInfo(nameTemplate = "WriteRegister %{p#register}", cycles = CYCLES_2, size = SIZE_1)

public final class WriteRegisterNode extends FixedWithNextNode implements LIRLowerable {

    public static final NodeClass<WriteRegisterNode> TYPE = NodeClass.create(WriteRegisterNode.class);

    /**

     * The fixed register to access.

     */

    protected final Register register;

    /**

     * The new value assigned to the register.

     */

    @Input ValueNode value;

    public WriteRegisterNode(Register register, ValueNode value) {

        super(TYPE, StampFactory.forVoid());

        this.register = register;

        this.value = value;

    }

    @Override

    public void generate(NodeLIRBuilderTool generator) {

        Value val = generator.operand(value);

        generator.getLIRGeneratorTool().emitWriteRegister(register, val, val.getValueKind());

    }

    @Override

    public String toString(Verbosity verbosity) {

        if (verbosity == Verbosity.Name) {

            return super.toString(Verbosity.Name) + "%" + register;

        } else {

            return super.toString(verbosity);

        }

    }

}