1 /*
   2  * Copyright (c) 2014, 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.core.common.type;
  24 
  25 import jdk.vm.ci.meta.Constant;
  26 import jdk.vm.ci.meta.MemoryAccessProvider;
  27 
  28 /**
  29  * Type describing primitive values.
  30  */
  31 public abstract class PrimitiveStamp extends ArithmeticStamp {
  32 
  33     private final int bits;
  34 
  35     protected PrimitiveStamp(int bits, ArithmeticOpTable ops) {
  36         super(ops);
  37         this.bits = bits;
  38     }
  39 
  40     /**
  41      * The width in bits of the value described by this stamp.
  42      */
  43     public int getBits() {
  44         return bits;
  45     }
  46 
  47     public static int getBits(Stamp stamp) {
  48         if (stamp instanceof PrimitiveStamp) {
  49             return ((PrimitiveStamp) stamp).getBits();
  50         } else {
  51             return 0;
  52         }
  53     }
  54 
  55     @Override
  56     public Constant readConstant(MemoryAccessProvider provider, Constant base, long displacement) {
  57         return provider.readPrimitiveConstant(getStackKind(), base, displacement, getBits());
  58     }
  59 
  60     @Override
  61     public int hashCode() {
  62         final int prime = 31;
  63         int result = super.hashCode();
  64         result = prime * result + bits;
  65         return result;
  66     }
  67 
  68     @Override
  69     public boolean equals(Object obj) {
  70         if (this == obj) {
  71             return true;
  72         }
  73         if (!(obj instanceof PrimitiveStamp)) {
  74             return false;
  75         }
  76         PrimitiveStamp other = (PrimitiveStamp) obj;
  77         if (bits != other.bits) {
  78             return false;
  79         }
  80         return super.equals(obj);
  81     }
  82 }