1 /*
   2  * Copyright (c) 2009, 2014, 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;
  24 
  25 import org.graalvm.compiler.core.common.type.StampFactory;
  26 import org.graalvm.compiler.graph.NodeClass;
  27 import org.graalvm.compiler.graph.NodeInputList;
  28 import org.graalvm.compiler.nodeinfo.InputType;
  29 import org.graalvm.compiler.nodeinfo.NodeInfo;
  30 import org.graalvm.compiler.nodes.extended.GuardingNode;
  31 
  32 /**
  33  * Guard {@link PhiNode}s merge guard dependencies at control flow merges.
  34  */
  35 @NodeInfo(nameTemplate = "GuardPhi({i#values})", allowedUsageTypes = {InputType.Guard})
  36 public final class GuardPhiNode extends PhiNode implements GuardingNode {
  37 
  38     public static final NodeClass<GuardPhiNode> TYPE = NodeClass.create(GuardPhiNode.class);
  39     @OptionalInput(InputType.Guard) NodeInputList<ValueNode> values;
  40 
  41     public GuardPhiNode(AbstractMergeNode merge) {
  42         super(TYPE, StampFactory.forVoid(), merge);
  43         this.values = new NodeInputList<>(this);
  44     }
  45 
  46     public GuardPhiNode(AbstractMergeNode merge, ValueNode[] values) {
  47         super(TYPE, StampFactory.forVoid(), merge);
  48         this.values = new NodeInputList<>(this, values);
  49     }
  50 
  51     @Override
  52     public NodeInputList<ValueNode> values() {
  53         return values;
  54     }
  55 
  56     @Override
  57     public boolean hasValidInput() {
  58         return true;
  59     }
  60 }