1 /*
  2  * Copyright (c) 2017, 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 package jdk.experimental.bytecode;
 25 
 26 public enum TypeTag implements Type {
 27     /**
 28      * byte
 29      */
 30     B("B", 0, 1, 8),
 31     /**
 32      * short
 33      */
 34     S("S", 0, 1, 9),
 35     /**
 36      * int
 37      */
 38     I("I", 0, 1, 10),
 39     /**
 40      * float
 41      */
 42     F("F", 2, 1, 6),
 43     /**
 44      * long
 45      */
 46     J("J", 1, 2, 11),
 47     /**
 48      * double
 49      */
 50     D("D", 3, 2, 7),
 51     /**
 52      * Reference type
 53      */
 54     A("A", 4, 1, -1),
 55     /**
 56      * char
 57      */
 58     C("C", 0, 1, 5),
 59     /**
 60      * boolean
 61      */
 62     Z("Z", 0, 1, 4),
 63     /**
 64      * void
 65      */
 66     V("V", -1, -1, -1),
 67     /**
 68      * Value type
 69      */
 70     Q("Q", -1, 1, -1);
 71 
 72     String typeStr;
 73     int offset;
 74     int width;
 75     int newarraycode;
 76 
 77     TypeTag(String typeStr, int offset, int width, int newarraycode) {
 78         this.typeStr = typeStr;
 79         this.offset = offset;
 80         this.width = width;
 81         this.newarraycode = newarraycode;
 82     }
 83 
 84     static TypeTag commonSupertype(TypeTag t1, TypeTag t2) {
 85         if (t1.isIntegral() && t2.isIntegral()) {
 86             int p1 = t1.ordinal();
 87             int p2 = t2.ordinal();
 88             return (p1 <= p2) ? t2 : t1;
 89         } else {
 90             return null;
 91         }
 92     }
 93 
 94     public int width() {
 95         return width;
 96     }
 97 
 98     boolean isIntegral() {
 99         switch (this) {
100             case B:
101             case S:
102             case I:
103                 return true;
104             default:
105                 return false;
106         }
107     }
108 
109     @Override
110     public TypeTag getTag() {
111         return this;
112     }
113 }