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annotate agent/src/share/classes/sun/jvm/hotspot/utilities/ConstantTag.java @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents 6a991dcb52bb
children f16e75e0cf11
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1 /*
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * 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 import sun.jvm.hotspot.runtime.BasicType;
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28
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29 public class ConstantTag {
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30 // These replicated from the VM to save space
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31 private static final int JVM_CONSTANT_Utf8 = 1;
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32 private static final int JVM_CONSTANT_Unicode = 2; // unused
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33 private static final int JVM_CONSTANT_Integer = 3;
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34 private static final int JVM_CONSTANT_Float = 4;
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35 private static final int JVM_CONSTANT_Long = 5;
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36 private static final int JVM_CONSTANT_Double = 6;
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37 private static final int JVM_CONSTANT_Class = 7;
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38 private static final int JVM_CONSTANT_String = 8;
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39 private static final int JVM_CONSTANT_Fieldref = 9;
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40 private static final int JVM_CONSTANT_Methodref = 10;
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41 private static final int JVM_CONSTANT_InterfaceMethodref = 11;
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42 private static final int JVM_CONSTANT_NameAndType = 12;
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43 private static final int JVM_CONSTANT_MethodHandle = 15; // JSR 292
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44 private static final int JVM_CONSTANT_MethodType = 16; // JSR 292
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45 // static final int JVM_CONSTANT_(unused) = 17; // JSR 292 early drafts only
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46 private static final int JVM_CONSTANT_InvokeDynamic = 18; // JSR 292
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47 private static final int JVM_CONSTANT_Invalid = 0; // For bad value initialization
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48 private static final int JVM_CONSTANT_UnresolvedClass = 100; // Temporary tag until actual use
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49 private static final int JVM_CONSTANT_ClassIndex = 101; // Temporary tag while constructing constant pool
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50 private static final int JVM_CONSTANT_StringIndex = 102; // Temporary tag while constructing constant pool
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51 private static final int JVM_CONSTANT_UnresolvedClassInError = 103; // Resolution failed
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52 private static final int JVM_CONSTANT_MethodHandleInError = 104; // Error tag due to resolution error
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53 private static final int JVM_CONSTANT_MethodTypeInError = 105; // Error tag due to resolution error
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54 private static final int JVM_CONSTANT_Object = 106; // Required for BoundMethodHandle arguments.
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55
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56 // JVM_CONSTANT_MethodHandle subtypes //FIXME: connect these to data structure
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57 private static int JVM_REF_getField = 1;
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58 private static int JVM_REF_getStatic = 2;
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59 private static int JVM_REF_putField = 3;
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60 private static int JVM_REF_putStatic = 4;
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61 private static int JVM_REF_invokeVirtual = 5;
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62 private static int JVM_REF_invokeStatic = 6;
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63 private static int JVM_REF_invokeSpecial = 7;
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64 private static int JVM_REF_newInvokeSpecial = 8;
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65 private static int JVM_REF_invokeInterface = 9;
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67 private byte tag;
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68
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69 public ConstantTag(byte tag) {
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70 this.tag = tag;
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71 }
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72
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73 public int value() { return tag; }
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74
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75 public boolean isKlass() { return tag == JVM_CONSTANT_Class; }
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76 public boolean isField () { return tag == JVM_CONSTANT_Fieldref; }
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77 public boolean isMethod() { return tag == JVM_CONSTANT_Methodref; }
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78 public boolean isInterfaceMethod() { return tag == JVM_CONSTANT_InterfaceMethodref; }
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79 public boolean isString() { return tag == JVM_CONSTANT_String; }
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80 public boolean isInt() { return tag == JVM_CONSTANT_Integer; }
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81 public boolean isFloat() { return tag == JVM_CONSTANT_Float; }
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82 public boolean isLong() { return tag == JVM_CONSTANT_Long; }
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83 public boolean isDouble() { return tag == JVM_CONSTANT_Double; }
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84 public boolean isNameAndType() { return tag == JVM_CONSTANT_NameAndType; }
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85 public boolean isUtf8() { return tag == JVM_CONSTANT_Utf8; }
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86 public boolean isMethodHandle() { return tag == JVM_CONSTANT_MethodHandle; }
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87 public boolean isMethodType() { return tag == JVM_CONSTANT_MethodType; }
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88 public boolean isInvokeDynamic() { return tag == JVM_CONSTANT_InvokeDynamic; }
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89
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90 public boolean isInvalid() { return tag == JVM_CONSTANT_Invalid; }
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91
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92 public boolean isUnresolvedKlass() {
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93 return tag == JVM_CONSTANT_UnresolvedClass || tag == JVM_CONSTANT_UnresolvedClassInError;
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94 }
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95 public boolean isUnresolveKlassInError() { return tag == JVM_CONSTANT_UnresolvedClassInError; }
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96 public boolean isKlassIndex() { return tag == JVM_CONSTANT_ClassIndex; }
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97 public boolean isStringIndex() { return tag == JVM_CONSTANT_StringIndex; }
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98
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99 public boolean isObject() { return tag == JVM_CONSTANT_Object; }
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100
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101 public boolean isKlassReference() { return isKlassIndex() || isUnresolvedKlass(); }
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102 public boolean isFieldOrMethod() { return isField() || isMethod() || isInterfaceMethod(); }
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103 public boolean isSymbol() { return isUtf8(); }
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104
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105 public BasicType basicType() {
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106 switch (tag) {
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107 case JVM_CONSTANT_Integer :
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108 return BasicType.T_INT;
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109 case JVM_CONSTANT_Float :
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110 return BasicType.T_FLOAT;
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111 case JVM_CONSTANT_Long :
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112 return BasicType.T_LONG;
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113 case JVM_CONSTANT_Double :
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114 return BasicType.T_DOUBLE;
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115
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116 case JVM_CONSTANT_Class :
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117 case JVM_CONSTANT_String :
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118 case JVM_CONSTANT_UnresolvedClass :
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119 case JVM_CONSTANT_UnresolvedClassInError :
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120 case JVM_CONSTANT_MethodHandleInError :
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121 case JVM_CONSTANT_MethodTypeInError :
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122 case JVM_CONSTANT_ClassIndex :
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123 case JVM_CONSTANT_StringIndex :
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124 case JVM_CONSTANT_MethodHandle :
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125 case JVM_CONSTANT_MethodType :
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126 case JVM_CONSTANT_Object :
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127 return BasicType.T_OBJECT;
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128 default:
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129 throw new InternalError("unexpected tag: " + tag);
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130 }
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131 }
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132
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133 public String toString() {
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134 return "ConstantTag:" + Integer.toString(tag);
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135 }
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136 }