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1 /*
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2 * Copyright 2000-2007 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.oops;
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26
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27 import java.io.*;
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28 import java.util.*;
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29 import sun.jvm.hotspot.debugger.*;
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30 import sun.jvm.hotspot.runtime.*;
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31 import sun.jvm.hotspot.types.*;
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32
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33 public class Klass extends Oop implements ClassConstants {
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34 static {
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35 VM.registerVMInitializedObserver(new Observer() {
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36 public void update(Observable o, Object data) {
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37 initialize(VM.getVM().getTypeDataBase());
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38 }
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39 });
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40 }
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41
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42 // anon-enum constants for _layout_helper.
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43 public static int LH_INSTANCE_SLOW_PATH_BIT;
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44 public static int LH_LOG2_ELEMENT_SIZE_SHIFT;
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45 public static int LH_ELEMENT_TYPE_SHIFT;
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46 public static int LH_HEADER_SIZE_SHIFT;
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47 public static int LH_ARRAY_TAG_SHIFT;
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48 public static int LH_ARRAY_TAG_TYPE_VALUE;
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49 public static int LH_ARRAY_TAG_OBJ_VALUE;
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50
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51 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
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52 Type type = db.lookupType("Klass");
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53 javaMirror = new OopField(type.getOopField("_java_mirror"), Oop.getHeaderSize());
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54 superField = new OopField(type.getOopField("_super"), Oop.getHeaderSize());
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55 layoutHelper = new IntField(type.getJIntField("_layout_helper"), Oop.getHeaderSize());
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56 name = new OopField(type.getOopField("_name"), Oop.getHeaderSize());
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57 accessFlags = new CIntField(type.getCIntegerField("_access_flags"), Oop.getHeaderSize());
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58 subklass = new OopField(type.getOopField("_subklass"), Oop.getHeaderSize());
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59 nextSibling = new OopField(type.getOopField("_next_sibling"), Oop.getHeaderSize());
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60 allocCount = new CIntField(type.getCIntegerField("_alloc_count"), Oop.getHeaderSize());
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61
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62 LH_INSTANCE_SLOW_PATH_BIT = db.lookupIntConstant("Klass::_lh_instance_slow_path_bit").intValue();
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63 LH_LOG2_ELEMENT_SIZE_SHIFT = db.lookupIntConstant("Klass::_lh_log2_element_size_shift").intValue();
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64 LH_ELEMENT_TYPE_SHIFT = db.lookupIntConstant("Klass::_lh_element_type_shift").intValue();
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65 LH_HEADER_SIZE_SHIFT = db.lookupIntConstant("Klass::_lh_header_size_shift").intValue();
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66 LH_ARRAY_TAG_SHIFT = db.lookupIntConstant("Klass::_lh_array_tag_shift").intValue();
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67 LH_ARRAY_TAG_TYPE_VALUE = db.lookupIntConstant("Klass::_lh_array_tag_type_value").intValue();
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68 LH_ARRAY_TAG_OBJ_VALUE = db.lookupIntConstant("Klass::_lh_array_tag_obj_value").intValue();
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69 }
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70
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71 Klass(OopHandle handle, ObjectHeap heap) {
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72 super(handle, heap);
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73 }
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74
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75 // jvmdi support - see also class_status in VM code
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76 public int getClassStatus() {
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77 return 0; // overridden in derived classes
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78 }
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79
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80 public boolean isKlass() { return true; }
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81
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82 // Fields
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83 private static OopField javaMirror;
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84 private static OopField superField;
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85 private static IntField layoutHelper;
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86 private static OopField name;
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87 private static CIntField accessFlags;
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88 private static OopField subklass;
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89 private static OopField nextSibling;
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90 private static CIntField allocCount;
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91
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92 // Accessors for declared fields
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93 public Instance getJavaMirror() { return (Instance) javaMirror.getValue(this); }
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94 public Klass getSuper() { return (Klass) superField.getValue(this); }
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95 public Klass getJavaSuper() { return null; }
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96 public int getLayoutHelper() { return (int) layoutHelper.getValue(this); }
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97 public Symbol getName() { return (Symbol) name.getValue(this); }
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98 public long getAccessFlags() { return accessFlags.getValue(this); }
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99 // Convenience routine
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100 public AccessFlags getAccessFlagsObj(){ return new AccessFlags(getAccessFlags()); }
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101 public Klass getSubklassKlass() { return (Klass) subklass.getValue(this); }
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102 public Klass getNextSiblingKlass() { return (Klass) nextSibling.getValue(this); }
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103 public long getAllocCount() { return allocCount.getValue(this); }
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104
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105 // computed access flags - takes care of inner classes etc.
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106 // This is closer to actual source level than getAccessFlags() etc.
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107 public long computeModifierFlags() {
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108 return 0L; // Unless overridden, modifier_flags is 0.
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109 }
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110
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111 // same as JVM_GetClassModifiers
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112 public final long getClassModifiers() {
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113 // unlike the VM counterpart we never have to deal with primitive type,
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114 // because we operator on Klass and not an instance of java.lang.Class.
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115 long flags = computeModifierFlags();
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116 if (isSuper()) {
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117 flags |= JVM_ACC_SUPER;
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118 }
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119 return flags;
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120 }
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121
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122 // subclass check
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123 public boolean isSubclassOf(Klass k) {
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124 if (k != null) {
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125 Klass t = this;
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126 // Run up the super chain and check
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127 while (t != null) {
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128 if (t.equals(k)) return true;
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129 t = t.getSuper();
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130 }
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131 }
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132 return false;
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133 }
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134
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135 // subtype check
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136 public boolean isSubtypeOf(Klass k) {
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137 return computeSubtypeOf(k);
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138 }
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139
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140 boolean computeSubtypeOf(Klass k) {
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141 return isSubclassOf(k);
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142 }
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143
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144 // Find LCA (Least Common Ancester) in class heirarchy
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145 public Klass lca( Klass k2 ) {
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146 Klass k1 = this;
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147 while ( true ) {
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148 if ( k1.isSubtypeOf(k2) ) return k2;
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149 if ( k2.isSubtypeOf(k1) ) return k1;
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150 k1 = k1.getSuper();
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151 k2 = k2.getSuper();
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152 }
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153 }
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154
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155 public void printValueOn(PrintStream tty) {
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156 tty.print("Klass");
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157 }
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158
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159 public void iterateFields(OopVisitor visitor, boolean doVMFields) {
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160 super.iterateFields(visitor, doVMFields);
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161 if (doVMFields) {
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162 visitor.doOop(javaMirror, true);
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163 visitor.doOop(superField, true);
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164 visitor.doInt(layoutHelper, true);
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165 visitor.doOop(name, true);
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166 visitor.doCInt(accessFlags, true);
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167 visitor.doOop(subklass, true);
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168 visitor.doOop(nextSibling, true);
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169 visitor.doCInt(allocCount, true);
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170 }
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171 }
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172
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173 public long getObjectSize() {
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174 System.out.println("should not reach here");
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175 return 0;
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176 }
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177
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178 /** Array class with specific rank */
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179 public Klass arrayKlass(int rank) { return arrayKlassImpl(false, rank); }
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180 /** Array class with this klass as element type */
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181 public Klass arrayKlass() { return arrayKlassImpl(false); }
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182 /** These will return null instead of allocating on the heap */
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183 public Klass arrayKlassOrNull(int rank) { return arrayKlassImpl(true, rank); }
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184 public Klass arrayKlassOrNull() { return arrayKlassImpl(true); }
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185
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186 public Klass arrayKlassImpl(boolean orNull, int rank) {
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187 throw new RuntimeException("array_klass should be dispatched to instanceKlass, objArrayKlass or typeArrayKlass");
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188 }
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189
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190 public Klass arrayKlassImpl(boolean orNull) {
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191 throw new RuntimeException("array_klass should be dispatched to instanceKlass, objArrayKlass or typeArrayKlass");
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192 }
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193
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194 // This returns the name in the form java/lang/String which isn't really a signature
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195 // The subclasses override this to produce the correct form, eg
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196 // Ljava/lang/String; For ArrayKlasses getName itself is the signature.
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197 public String signature() { return getName().asString(); }
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198
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199 // Convenience routines
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200 public boolean isPublic() { return getAccessFlagsObj().isPublic(); }
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201 public boolean isFinal() { return getAccessFlagsObj().isFinal(); }
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202 public boolean isInterface() { return getAccessFlagsObj().isInterface(); }
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203 public boolean isAbstract() { return getAccessFlagsObj().isAbstract(); }
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204 public boolean isSuper() { return getAccessFlagsObj().isSuper(); }
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205 public boolean isSynthetic() { return getAccessFlagsObj().isSynthetic(); }
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206 public boolean hasFinalizer() { return getAccessFlagsObj().hasFinalizer(); }
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207 public boolean isCloneable() { return getAccessFlagsObj().isCloneable(); }
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208 public boolean hasVanillaConstructor() { return getAccessFlagsObj().hasVanillaConstructor(); }
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209 public boolean hasMirandaMethods () { return getAccessFlagsObj().hasMirandaMethods(); }
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210 }
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