1 /*
   2  * Copyright (c) 2016, 2016, 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.common.type;
  24 
  25 /**
  26  * A pair of stamp with one being the stamp that can be trusted and the other one being a guess that
  27  * needs a dynamic check to be used.
  28  */
  29 public final class StampPair {
  30 
  31     private final Stamp trustedStamp;
  32     private final Stamp uncheckedStamp;
  33 
  34     private StampPair(Stamp trustedStamp, Stamp uncheckedStamp) {
  35         assert trustedStamp != null;
  36         this.trustedStamp = trustedStamp;
  37         this.uncheckedStamp = uncheckedStamp;
  38     }
  39 
  40     public static StampPair create(Stamp trustedStamp, Stamp uncheckedStamp) {
  41         return new StampPair(trustedStamp, uncheckedStamp);
  42     }
  43 
  44     public static StampPair createSingle(Stamp stamp) {
  45         return new StampPair(stamp, null);
  46     }
  47 
  48     public Stamp getUncheckedStamp() {
  49         return uncheckedStamp;
  50     }
  51 
  52     public Stamp getTrustedStamp() {
  53         return trustedStamp;
  54     }
  55 
  56     @Override
  57     public String toString() {
  58         if (uncheckedStamp == null) {
  59             return trustedStamp.toString();
  60         } else {
  61             return trustedStamp + " (unchecked=" + uncheckedStamp + ")";
  62         }
  63     }
  64 }