001/*
002 * Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.replacements.nodes;
024
025import jdk.internal.jvmci.code.*;
026import jdk.internal.jvmci.meta.*;
027
028import com.oracle.graal.compiler.common.type.*;
029import com.oracle.graal.graph.*;
030import com.oracle.graal.nodeinfo.*;
031import com.oracle.graal.nodes.*;
032import com.oracle.graal.nodes.spi.*;
033
034/**
035 * Changes the value of a specific register.
036 */
037@NodeInfo(nameTemplate = "WriteRegister %{p#register}")
038public final class WriteRegisterNode extends FixedWithNextNode implements LIRLowerable {
039
040    public static final NodeClass<WriteRegisterNode> TYPE = NodeClass.create(WriteRegisterNode.class);
041    /**
042     * The fixed register to access.
043     */
044    protected final Register register;
045
046    /**
047     * The new value assigned to the register.
048     */
049    @Input ValueNode value;
050
051    public WriteRegisterNode(Register register, ValueNode value) {
052        super(TYPE, StampFactory.forVoid());
053        this.register = register;
054        this.value = value;
055    }
056
057    @Override
058    public void generate(NodeLIRBuilderTool generator) {
059        Value val = generator.operand(value);
060        generator.getLIRGeneratorTool().emitMove(register.asValue(val.getLIRKind()), val);
061    }
062
063    @Override
064    public String toString(Verbosity verbosity) {
065        if (verbosity == Verbosity.Name) {
066            return super.toString(Verbosity.Name) + "%" + register;
067        } else {
068            return super.toString(verbosity);
069        }
070    }
071}