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1 /*
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2 * Copyright 2001-2005 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.utilities;
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26
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27 public class ConstantTag {
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28 // These replicated from the VM to save space
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29 private static int JVM_CONSTANT_Utf8 = 1;
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30 private static int JVM_CONSTANT_Unicode = 2; // unused
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31 private static int JVM_CONSTANT_Integer = 3;
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32 private static int JVM_CONSTANT_Float = 4;
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33 private static int JVM_CONSTANT_Long = 5;
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34 private static int JVM_CONSTANT_Double = 6;
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35 private static int JVM_CONSTANT_Class = 7;
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36 private static int JVM_CONSTANT_String = 8;
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37 private static int JVM_CONSTANT_Fieldref = 9;
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38 private static int JVM_CONSTANT_Methodref = 10;
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39 private static int JVM_CONSTANT_InterfaceMethodref = 11;
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40 private static int JVM_CONSTANT_NameAndType = 12;
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41 private static int JVM_CONSTANT_Invalid = 0; // For bad value initialization
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42 private static int JVM_CONSTANT_UnresolvedClass = 100; // Temporary tag until actual use
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43 private static int JVM_CONSTANT_ClassIndex = 101; // Temporary tag while constructing constant pool
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44 private static int JVM_CONSTANT_UnresolvedString = 102; // Temporary tag until actual use
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45 private static int JVM_CONSTANT_StringIndex = 103; // Temporary tag while constructing constant pool
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46 private static int JVM_CONSTANT_UnresolvedClassInError = 104; // Resolution failed
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47
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48 private byte tag;
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49
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50 public ConstantTag(byte tag) {
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51 this.tag = tag;
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52 }
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53
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54 public boolean isKlass() { return tag == JVM_CONSTANT_Class; }
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55 public boolean isField () { return tag == JVM_CONSTANT_Fieldref; }
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56 public boolean isMethod() { return tag == JVM_CONSTANT_Methodref; }
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57 public boolean isInterfaceMethod() { return tag == JVM_CONSTANT_InterfaceMethodref; }
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58 public boolean isString() { return tag == JVM_CONSTANT_String; }
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59 public boolean isInt() { return tag == JVM_CONSTANT_Integer; }
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60 public boolean isFloat() { return tag == JVM_CONSTANT_Float; }
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61 public boolean isLong() { return tag == JVM_CONSTANT_Long; }
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62 public boolean isDouble() { return tag == JVM_CONSTANT_Double; }
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63 public boolean isNameAndType() { return tag == JVM_CONSTANT_NameAndType; }
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64 public boolean isUtf8() { return tag == JVM_CONSTANT_Utf8; }
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65
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66 public boolean isInvalid() { return tag == JVM_CONSTANT_Invalid; }
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67
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68 public boolean isUnresolvedKlass() {
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69 return tag == JVM_CONSTANT_UnresolvedClass || tag == JVM_CONSTANT_UnresolvedClassInError;
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70 }
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71 public boolean isUnresolveKlassInError() { return tag == JVM_CONSTANT_UnresolvedClassInError; }
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72 public boolean isKlassIndex() { return tag == JVM_CONSTANT_ClassIndex; }
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73 public boolean isUnresolvedString() { return tag == JVM_CONSTANT_UnresolvedString; }
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74 public boolean isStringIndex() { return tag == JVM_CONSTANT_StringIndex; }
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75
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76 public boolean isKlassReference() { return isKlassIndex() || isUnresolvedKlass(); }
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77 public boolean isFieldOrMethod() { return isField() || isMethod() || isInterfaceMethod(); }
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78 public boolean isSymbol() { return isUtf8(); }
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79 }
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