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 
  24 
  25 package org.graalvm.compiler.core.common.type;
  26 
  27 import java.nio.ByteBuffer;
  28 import java.util.Objects;
  29 
  30 import jdk.vm.ci.meta.SerializableConstant;
  31 
  32 /**
  33  * Type describing values that support arithmetic operations.
  34  */
  35 public abstract class ArithmeticStamp extends Stamp {
  36 
  37     private final ArithmeticOpTable ops;
  38 
  39     protected ArithmeticStamp(ArithmeticOpTable ops) {
  40         this.ops = ops;
  41     }
  42 
  43     public ArithmeticOpTable getOps() {
  44         return ops;
  45     }
  46 
  47     public abstract SerializableConstant deserialize(ByteBuffer buffer);
  48 
  49     @Override
  50     public Stamp improveWith(Stamp other) {
  51         if (this.isCompatible(other)) {
  52             return this.join(other);
  53         }
  54         // Cannot improve, because stamps are not compatible.
  55         return this;
  56     }
  57 
  58     @Override
  59     public int hashCode() {
  60         final int prime = 31;
  61         int result = 1;
  62         result = prime * result + ops.hashCode();
  63         return result;
  64     }
  65 
  66     @Override
  67     public boolean equals(Object obj) {
  68         if (this == obj) {
  69             return true;
  70         }
  71         if (!(obj instanceof ArithmeticStamp)) {
  72             return false;
  73         }
  74         assert Objects.equals(ops, ((ArithmeticStamp) obj).ops) : ops + " vs. " + ((ArithmeticStamp) obj).ops;
  75         return true;
  76     }
  77 }