1 /*
   2  * Copyright (c) 2013, 2019, 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 
  24 
  25 package org.graalvm.compiler.replacements.nodes;
  26 
  27 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2;
  28 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1;
  29 
  30 import org.graalvm.compiler.core.common.type.StampFactory;
  31 import org.graalvm.compiler.graph.NodeClass;
  32 import org.graalvm.compiler.nodeinfo.NodeInfo;
  33 import org.graalvm.compiler.nodeinfo.Verbosity;
  34 import org.graalvm.compiler.nodes.FixedWithNextNode;
  35 import org.graalvm.compiler.nodes.ValueNode;
  36 import org.graalvm.compiler.nodes.spi.LIRLowerable;
  37 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
  38 
  39 import jdk.vm.ci.code.Register;
  40 import jdk.vm.ci.meta.Value;
  41 
  42 /**
  43  * Changes the value of a specific register.
  44  */
  45 @NodeInfo(nameTemplate = "WriteRegister %{p#register}", cycles = CYCLES_2, size = SIZE_1)
  46 public final class WriteRegisterNode extends FixedWithNextNode implements LIRLowerable {
  47 
  48     public static final NodeClass<WriteRegisterNode> TYPE = NodeClass.create(WriteRegisterNode.class);
  49     /**
  50      * The fixed register to access.
  51      */
  52     protected final Register register;
  53 
  54     /**
  55      * The new value assigned to the register.
  56      */
  57     @Input ValueNode value;
  58 
  59     public WriteRegisterNode(Register register, ValueNode value) {
  60         super(TYPE, StampFactory.forVoid());
  61         this.register = register;
  62         this.value = value;
  63     }
  64 
  65     @Override
  66     public void generate(NodeLIRBuilderTool generator) {
  67         Value val = generator.operand(value);
  68         generator.getLIRGeneratorTool().emitWriteRegister(register, val, val.getValueKind());
  69     }
  70 
  71     @Override
  72     public String toString(Verbosity verbosity) {
  73         if (verbosity == Verbosity.Name) {
  74             return super.toString(Verbosity.Name) + "%" + register;
  75         } else {
  76             return super.toString(verbosity);
  77         }
  78     }
  79 }