1 /*
   2  * Copyright (c) 2015, 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 
  24 
  25 package org.graalvm.compiler.nodes.extended;
  26 
  27 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_0;
  28 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_0;
  29 
  30 import org.graalvm.compiler.graph.NodeClass;
  31 import org.graalvm.compiler.nodeinfo.NodeInfo;
  32 import org.graalvm.compiler.nodes.NodeView;
  33 import org.graalvm.compiler.nodes.ValueNode;
  34 import org.graalvm.compiler.nodes.calc.FloatingNode;
  35 import org.graalvm.compiler.nodes.spi.LIRLowerable;
  36 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
  37 
  38 @NodeInfo(cycles = CYCLES_0, size = SIZE_0)
  39 public final class OpaqueNode extends FloatingNode implements LIRLowerable {
  40     public static final NodeClass<OpaqueNode> TYPE = NodeClass.create(OpaqueNode.class);
  41 
  42     @Input protected ValueNode value;
  43     protected Object noGVN = new Object();
  44 
  45     public OpaqueNode(ValueNode value) {
  46         super(TYPE, value.stamp(NodeView.DEFAULT).unrestricted());
  47         this.value = value;
  48     }
  49 
  50     public ValueNode getValue() {
  51         return value;
  52     }
  53 
  54     public void setValue(ValueNode value) {
  55         this.updateUsages(this.value, value);
  56         this.value = value;
  57     }
  58 
  59     public void remove() {
  60         replaceAndDelete(getValue());
  61     }
  62 
  63     @Override
  64     public void generate(NodeLIRBuilderTool gen) {
  65         gen.setResult(this, gen.operand(value));
  66     }
  67 }