1 /*
   2  * Copyright (c) 2014, 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.core.match;
  24 
  25 import org.graalvm.compiler.core.common.LIRKind;
  26 import org.graalvm.compiler.core.gen.NodeLIRBuilder;
  27 
  28 import jdk.vm.ci.meta.Value;
  29 
  30 /**
  31  * A wrapper value for the lazy evaluation of a complex match. There's an intermediate class for the
  32  * closure because Value is serializable which is a hassle for the little inner classes which
  33  * usually occur here.
  34  */
  35 public class ComplexMatchValue extends Value {
  36 
  37     /**
  38      * This is the Value of a node which was matched as part of a complex match. The value isn't
  39      * actually useable but this marks it as having been evaluated.
  40      */
  41     public static final Value INTERIOR_MATCH = new Value(LIRKind.Illegal) {
  42 
  43         @Override
  44         public String toString() {
  45             return "INTERIOR_MATCH";
  46         }
  47 
  48         @Override
  49         public boolean equals(Object other) {
  50             // This class is a singleton
  51             return other != null && getClass() == other.getClass();
  52         }
  53     };
  54 
  55     final ComplexMatchResult result;
  56 
  57     public ComplexMatchValue(ComplexMatchResult result) {
  58         super(LIRKind.Illegal);
  59         this.result = result;
  60     }
  61 
  62     public Value evaluate(NodeLIRBuilder builder) {
  63         return result.evaluate(builder);
  64     }
  65 }