1 /*
   2  * Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package org.graalvm.compiler.replacements.nodes;
  24 
  25 import org.graalvm.compiler.core.common.type.StampFactory;
  26 import org.graalvm.compiler.graph.NodeClass;
  27 import org.graalvm.compiler.nodeinfo.NodeInfo;
  28 import org.graalvm.compiler.nodeinfo.Verbosity;
  29 import org.graalvm.compiler.nodes.FixedWithNextNode;
  30 import org.graalvm.compiler.nodes.ValueNode;
  31 import org.graalvm.compiler.nodes.spi.LIRLowerable;
  32 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
  33 
  34 import jdk.vm.ci.code.Register;
  35 import jdk.vm.ci.meta.Value;
  36 
  37 /**
  38  * Changes the value of a specific register.
  39  */
  40 @NodeInfo(nameTemplate = "WriteRegister %{p#register}")
  41 public final class WriteRegisterNode extends FixedWithNextNode implements LIRLowerable {
  42 
  43     public static final NodeClass<WriteRegisterNode> TYPE = NodeClass.create(WriteRegisterNode.class);
  44     /**
  45      * The fixed register to access.
  46      */
  47     protected final Register register;
  48 
  49     /**
  50      * The new value assigned to the register.
  51      */
  52     @Input ValueNode value;
  53 
  54     public WriteRegisterNode(Register register, ValueNode value) {
  55         super(TYPE, StampFactory.forVoid());
  56         this.register = register;
  57         this.value = value;
  58     }
  59 
  60     @Override
  61     public void generate(NodeLIRBuilderTool generator) {
  62         Value val = generator.operand(value);
  63         generator.getLIRGeneratorTool().emitMove(register.asValue(val.getValueKind()), val);
  64     }
  65 
  66     @Override
  67     public String toString(Verbosity verbosity) {
  68         if (verbosity == Verbosity.Name) {
  69             return super.toString(Verbosity.Name) + "%" + register;
  70         } else {
  71             return super.toString(verbosity);
  72         }
  73     }
  74 }