1 /*
   2  * Copyright (c) 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.nodes.debug.instrumentation;
  24 
  25 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_IGNORED;
  26 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_IGNORED;
  27 
  28 import org.graalvm.compiler.core.common.type.StampFactory;
  29 import org.graalvm.compiler.graph.NodeClass;
  30 import org.graalvm.compiler.nodeinfo.InputType;
  31 import org.graalvm.compiler.nodeinfo.NodeInfo;
  32 import org.graalvm.compiler.nodes.AbstractStateSplit;
  33 import org.graalvm.compiler.nodes.ValueNode;
  34 import org.graalvm.compiler.nodes.spi.LIRLowerable;
  35 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
  36 
  37 /**
  38  * The {@code InstrumentationBeginNode} represents the boundary of the instrumentation. It also
  39  * maintains the target of the instrumentation.
  40  */
  41 @NodeInfo(cycles = CYCLES_IGNORED, size = SIZE_IGNORED)
  42 public final class InstrumentationBeginNode extends AbstractStateSplit implements LIRLowerable {
  43 
  44     public static final NodeClass<InstrumentationBeginNode> TYPE = NodeClass.create(InstrumentationBeginNode.class);
  45 
  46     @OptionalInput(value = InputType.Unchecked) protected ValueNode target;
  47     private final boolean anchored;
  48 
  49     public InstrumentationBeginNode(boolean anchored) {
  50         super(TYPE, StampFactory.forVoid());
  51         this.anchored = anchored;
  52         this.target = null;
  53 
  54     }
  55 
  56     public boolean isAnchored() {
  57         return anchored;
  58     }
  59 
  60     public ValueNode getTarget() {
  61         return target;
  62     }
  63 
  64     public void setTarget(ValueNode target) {
  65         updateUsages(this.target, target);
  66         this.target = target;
  67     }
  68 
  69     @Override
  70     public void generate(NodeLIRBuilderTool generator) {
  71         // do nothing
  72     }
  73 
  74 }