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1 /*
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2 * Copyright 1997-2007 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 // An instanceKlass is the VM level representation of a Java class.
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26 // It contains all information needed for at class at execution runtime.
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27
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28 // instanceKlass layout:
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29 // [header ] klassOop
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30 // [klass pointer ] klassOop
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31 // [C++ vtbl pointer ] Klass
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32 // [subtype cache ] Klass
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33 // [instance size ] Klass
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34 // [java mirror ] Klass
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35 // [super ] Klass
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36 // [access_flags ] Klass
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37 // [name ] Klass
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38 // [first subklass ] Klass
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39 // [next sibling ] Klass
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40 // [array klasses ]
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41 // [methods ]
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42 // [local interfaces ]
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43 // [transitive interfaces ]
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44 // [number of implementors ]
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45 // [implementors ] klassOop[2]
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46 // [fields ]
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47 // [constants ]
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48 // [class loader ]
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49 // [protection domain ]
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50 // [signers ]
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51 // [source file name ]
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52 // [inner classes ]
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53 // [static field size ]
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54 // [nonstatic field size ]
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55 // [static oop fields size ]
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56 // [nonstatic oop maps size ]
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57 // [has finalize method ]
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58 // [deoptimization mark bit ]
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59 // [initialization state ]
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60 // [initializing thread ]
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61 // [Java vtable length ]
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62 // [oop map cache (stack maps) ]
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63 // [EMBEDDED Java vtable ] size in words = vtable_len
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64 // [EMBEDDED static oop fields ] size in words = static_oop_fields_size
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65 // [ static non-oop fields ] size in words = static_field_size - static_oop_fields_size
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66 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
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67 //
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68 // The embedded nonstatic oop-map blocks are short pairs (offset, length) indicating
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69 // where oops are located in instances of this klass.
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70
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71
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72 // forward declaration for class -- see below for definition
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73 class SuperTypeClosure;
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74 class OopMapBlock;
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75 class JNIid;
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76 class jniIdMapBase;
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77 class BreakpointInfo;
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78 class fieldDescriptor;
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79 class DepChange;
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80 class nmethodBucket;
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81 class PreviousVersionNode;
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82 class JvmtiCachedClassFieldMap;
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83
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84 // This is used in iterators below.
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85 class FieldClosure: public StackObj {
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86 public:
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87 virtual void do_field(fieldDescriptor* fd) = 0;
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88 };
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89
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90 #ifndef PRODUCT
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91 // Print fields.
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92 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
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93 class FieldPrinter: public FieldClosure {
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94 oop _obj;
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95 outputStream* _st;
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96 public:
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97 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
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98 void do_field(fieldDescriptor* fd);
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99 };
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100 #endif // !PRODUCT
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101
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102 class instanceKlass: public Klass {
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103 friend class VMStructs;
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104 public:
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105 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
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106 // of the class loading & initialization procedure, and the use of the states.
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107 enum ClassState {
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108 unparsable_by_gc = 0, // object is not yet parsable by gc. Value of _init_state at object allocation.
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109 allocated, // allocated (but not yet linked)
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110 loaded, // loaded and inserted in class hierarchy (but not linked yet)
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111 linked, // successfully linked/verified (but not initialized yet)
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112 being_initialized, // currently running class initializer
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113 fully_initialized, // initialized (successfull final state)
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114 initialization_error // error happened during initialization
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115 };
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116
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117 public:
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118 oop* oop_block_beg() const { return adr_array_klasses(); }
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119 oop* oop_block_end() const { return adr_methods_default_annotations() + 1; }
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120
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121 enum {
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122 implementors_limit = 2 // how many implems can we track?
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123 };
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124
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125 protected:
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126 //
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127 // The oop block. See comment in klass.hpp before making changes.
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128 //
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129
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130 // Array classes holding elements of this class.
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131 klassOop _array_klasses;
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132 // Method array.
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133 objArrayOop _methods;
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134 // Int array containing the original order of method in the class file (for
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135 // JVMTI).
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136 typeArrayOop _method_ordering;
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137 // Interface (klassOops) this class declares locally to implement.
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138 objArrayOop _local_interfaces;
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139 // Interface (klassOops) this class implements transitively.
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140 objArrayOop _transitive_interfaces;
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141 // Instance and static variable information, 5-tuples of shorts [access, name
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142 // index, sig index, initval index, offset].
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143 typeArrayOop _fields;
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144 // Constant pool for this class.
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145 constantPoolOop _constants;
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146 // Class loader used to load this class, NULL if VM loader used.
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147 oop _class_loader;
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148 // Protection domain.
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149 oop _protection_domain;
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150 // Class signers.
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151 objArrayOop _signers;
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152 // Name of source file containing this klass, NULL if not specified.
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153 symbolOop _source_file_name;
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154 // the source debug extension for this klass, NULL if not specified.
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155 symbolOop _source_debug_extension;
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156 // inner_classes attribute.
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157 typeArrayOop _inner_classes;
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158 // Implementors of this interface (not valid if it overflows)
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159 klassOop _implementors[implementors_limit];
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160 // Generic signature, or null if none.
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161 symbolOop _generic_signature;
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162 // Annotations for this class, or null if none.
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163 typeArrayOop _class_annotations;
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164 // Annotation objects (byte arrays) for fields, or null if no annotations.
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165 // Indices correspond to entries (not indices) in fields array.
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166 objArrayOop _fields_annotations;
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167 // Annotation objects (byte arrays) for methods, or null if no annotations.
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168 // Index is the idnum, which is initially the same as the methods array index.
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169 objArrayOop _methods_annotations;
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170 // Annotation objects (byte arrays) for methods' parameters, or null if no
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171 // such annotations.
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172 // Index is the idnum, which is initially the same as the methods array index.
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173 objArrayOop _methods_parameter_annotations;
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174 // Annotation objects (byte arrays) for methods' default values, or null if no
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175 // such annotations.
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176 // Index is the idnum, which is initially the same as the methods array index.
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177 objArrayOop _methods_default_annotations;
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178
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179 //
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180 // End of the oop block.
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181 //
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182
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183 int _nonstatic_field_size; // number of non-static fields in this klass (including inherited fields)
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184 int _static_field_size; // number of static fields (oop and non-oop) in this klass
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185 int _static_oop_field_size;// number of static oop fields in this klass
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186 int _nonstatic_oop_map_size;// number of nonstatic oop-map blocks allocated at end of this klass
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187 bool _is_marked_dependent; // used for marking during flushing and deoptimization
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188 bool _rewritten; // methods rewritten.
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189 u2 _minor_version; // minor version number of class file
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190 u2 _major_version; // major version number of class file
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191 ClassState _init_state; // state of class
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192 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
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193 int _vtable_len; // length of Java vtable (in words)
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194 int _itable_len; // length of Java itable (in words)
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195 ReferenceType _reference_type; // reference type
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196 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
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197 JNIid* _jni_ids; // First JNI identifier for static fields in this class
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198 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
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199 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL
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200 nmethodBucket* _dependencies; // list of dependent nmethods
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201 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
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202 BreakpointInfo* _breakpoints; // bpt lists, managed by methodOop
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203 int _nof_implementors; // No of implementors of this interface (zero if not an interface)
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204 // Array of interesting part(s) of the previous version(s) of this
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205 // instanceKlass. See PreviousVersionWalker below.
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206 GrowableArray<PreviousVersionNode *>* _previous_versions;
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207 u2 _enclosing_method_class_index; // Constant pool index for class of enclosing method, or 0 if none
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208 u2 _enclosing_method_method_index; // Constant pool index for name and type of enclosing method, or 0 if none
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209 // JVMTI fields can be moved to their own structure - see 6315920
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210 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH
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211 jint _cached_class_file_len; // JVMTI: length of above
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212 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
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213 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
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214
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215 // embedded Java vtable follows here
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216 // embedded Java itables follows here
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217 // embedded static fields follows here
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218 // embedded nonstatic oop-map blocks follows here
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219
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220 friend class instanceKlassKlass;
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221 friend class SystemDictionary;
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222
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223 public:
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224 // field sizes
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225 int nonstatic_field_size() const { return _nonstatic_field_size; }
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226 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
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227
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228 int static_field_size() const { return _static_field_size; }
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229 void set_static_field_size(int size) { _static_field_size = size; }
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230
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231 int static_oop_field_size() const { return _static_oop_field_size; }
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232 void set_static_oop_field_size(int size) { _static_oop_field_size = size; }
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233
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234 // Java vtable
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235 int vtable_length() const { return _vtable_len; }
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236 void set_vtable_length(int len) { _vtable_len = len; }
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237
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238 // Java itable
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239 int itable_length() const { return _itable_len; }
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240 void set_itable_length(int len) { _itable_len = len; }
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241
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242 // array klasses
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243 klassOop array_klasses() const { return _array_klasses; }
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244 void set_array_klasses(klassOop k) { oop_store_without_check((oop*) &_array_klasses, (oop) k); }
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245
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246 // methods
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247 objArrayOop methods() const { return _methods; }
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248 void set_methods(objArrayOop a) { oop_store_without_check((oop*) &_methods, (oop) a); }
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249 methodOop method_with_idnum(int idnum);
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250
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251 // method ordering
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252 typeArrayOop method_ordering() const { return _method_ordering; }
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253 void set_method_ordering(typeArrayOop m) { oop_store_without_check((oop*) &_method_ordering, (oop) m); }
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254
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255 // interfaces
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256 objArrayOop local_interfaces() const { return _local_interfaces; }
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257 void set_local_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_local_interfaces, (oop) a); }
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258 objArrayOop transitive_interfaces() const { return _transitive_interfaces; }
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259 void set_transitive_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_transitive_interfaces, (oop) a); }
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260
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261 // fields
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262 // Field info extracted from the class file and stored
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263 // as an array of 7 shorts
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264 enum FieldOffset {
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265 access_flags_offset = 0,
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266 name_index_offset = 1,
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267 signature_index_offset = 2,
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268 initval_index_offset = 3,
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269 low_offset = 4,
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270 high_offset = 5,
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271 generic_signature_offset = 6,
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272 next_offset = 7
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273 };
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274
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275 typeArrayOop fields() const { return _fields; }
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276 int offset_from_fields( int index ) const {
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277 return build_int_from_shorts( fields()->ushort_at(index + low_offset),
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278 fields()->ushort_at(index + high_offset) );
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279 }
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280
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281 void set_fields(typeArrayOop f) { oop_store_without_check((oop*) &_fields, (oop) f); }
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282
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283 // inner classes
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284 typeArrayOop inner_classes() const { return _inner_classes; }
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285 void set_inner_classes(typeArrayOop f) { oop_store_without_check((oop*) &_inner_classes, (oop) f); }
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286
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287 enum InnerClassAttributeOffset {
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288 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
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289 inner_class_inner_class_info_offset = 0,
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290 inner_class_outer_class_info_offset = 1,
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291 inner_class_inner_name_offset = 2,
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292 inner_class_access_flags_offset = 3,
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293 inner_class_next_offset = 4
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294 };
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295
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296 // package
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297 bool is_same_class_package(klassOop class2);
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298 bool is_same_class_package(oop classloader2, symbolOop classname2);
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299 static bool is_same_class_package(oop class_loader1, symbolOop class_name1, oop class_loader2, symbolOop class_name2);
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300
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301 // initialization state
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302 bool is_loaded() const { return _init_state >= loaded; }
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303 bool is_linked() const { return _init_state >= linked; }
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304 bool is_initialized() const { return _init_state == fully_initialized; }
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305 bool is_not_initialized() const { return _init_state < being_initialized; }
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306 bool is_being_initialized() const { return _init_state == being_initialized; }
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307 bool is_in_error_state() const { return _init_state == initialization_error; }
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308 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
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309 int get_init_state() { return _init_state; } // Useful for debugging
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310 bool is_rewritten() const { return _rewritten; }
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311
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312 // marking
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313 bool is_marked_dependent() const { return _is_marked_dependent; }
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314 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
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315
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316 // initialization (virtuals from Klass)
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317 bool should_be_initialized() const; // means that initialize should be called
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318 void initialize(TRAPS);
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319 void link_class(TRAPS);
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320 bool link_class_or_fail(TRAPS); // returns false on failure
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321 void unlink_class();
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322 void rewrite_class(TRAPS);
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323 methodOop class_initializer();
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324
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325 // set the class to initialized if no static initializer is present
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326 void eager_initialize(Thread *thread);
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327
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328 // reference type
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329 ReferenceType reference_type() const { return _reference_type; }
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330 void set_reference_type(ReferenceType t) { _reference_type = t; }
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331
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332 // find local field, returns true if found
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333 bool find_local_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const;
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334 // find field in direct superinterfaces, returns the interface in which the field is defined
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335 klassOop find_interface_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const;
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336 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
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337 klassOop find_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const;
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338 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
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339 klassOop find_field(symbolOop name, symbolOop sig, bool is_static, fieldDescriptor* fd) const;
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340
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341 // find a non-static or static field given its offset within the class.
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342 bool contains_field_offset(int offset) {
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343 return ((offset/wordSize) >= instanceOopDesc::header_size() &&
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344 (offset/wordSize)-instanceOopDesc::header_size() < nonstatic_field_size());
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345 }
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346
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347 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
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348 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
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349
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350 // find a local method (returns NULL if not found)
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351 methodOop find_method(symbolOop name, symbolOop signature) const;
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352 static methodOop find_method(objArrayOop methods, symbolOop name, symbolOop signature);
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353
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354 // lookup operation (returns NULL if not found)
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355 methodOop uncached_lookup_method(symbolOop name, symbolOop signature) const;
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356
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357 // lookup a method in all the interfaces that this class implements
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358 // (returns NULL if not found)
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359 methodOop lookup_method_in_all_interfaces(symbolOop name, symbolOop signature) const;
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360
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361 // constant pool
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362 constantPoolOop constants() const { return _constants; }
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363 void set_constants(constantPoolOop c) { oop_store_without_check((oop*) &_constants, (oop) c); }
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364
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365 // class loader
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366 oop class_loader() const { return _class_loader; }
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367 void set_class_loader(oop l) { oop_store((oop*) &_class_loader, l); }
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368
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369 // protection domain
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370 oop protection_domain() { return _protection_domain; }
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371 void set_protection_domain(oop pd) { oop_store((oop*) &_protection_domain, pd); }
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372
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373 // signers
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374 objArrayOop signers() const { return _signers; }
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375 void set_signers(objArrayOop s) { oop_store((oop*) &_signers, oop(s)); }
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376
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377 // source file name
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378 symbolOop source_file_name() const { return _source_file_name; }
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379 void set_source_file_name(symbolOop n) { oop_store_without_check((oop*) &_source_file_name, (oop) n); }
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380
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381 // minor and major version numbers of class file
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382 u2 minor_version() const { return _minor_version; }
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383 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
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384 u2 major_version() const { return _major_version; }
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385 void set_major_version(u2 major_version) { _major_version = major_version; }
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386
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387 // source debug extension
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388 symbolOop source_debug_extension() const { return _source_debug_extension; }
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389 void set_source_debug_extension(symbolOop n){ oop_store_without_check((oop*) &_source_debug_extension, (oop) n); }
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390
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391 // nonstatic oop-map blocks
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392 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
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393 void set_nonstatic_oop_map_size(int size) { _nonstatic_oop_map_size = size; }
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394
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395 // RedefineClasses() support for previous versions:
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396 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods,
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397 int emcp_method_count);
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398 bool has_previous_version() const;
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399 void init_previous_versions() {
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400 _previous_versions = NULL;
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|
401 }
|
|
402 GrowableArray<PreviousVersionNode *>* previous_versions() const {
|
|
403 return _previous_versions;
|
|
404 }
|
|
405
|
|
406 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
|
|
407 void set_cached_class_file(unsigned char *class_file_bytes,
|
|
408 jint class_file_len) { _cached_class_file_len = class_file_len;
|
|
409 _cached_class_file_bytes = class_file_bytes; }
|
|
410 jint get_cached_class_file_len() { return _cached_class_file_len; }
|
|
411 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; }
|
|
412
|
|
413 // JVMTI: Support for caching of field indices, types, and offsets
|
|
414 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
|
|
415 _jvmti_cached_class_field_map = descriptor;
|
|
416 }
|
|
417 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
|
|
418 return _jvmti_cached_class_field_map;
|
|
419 }
|
|
420
|
|
421 // for adding methods, constMethodOopDesc::UNSET_IDNUM means no more ids available
|
|
422 inline u2 next_method_idnum();
|
|
423 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
|
|
424
|
|
425 // generics support
|
|
426 symbolOop generic_signature() const { return _generic_signature; }
|
|
427 void set_generic_signature(symbolOop sig) { oop_store_without_check((oop*)&_generic_signature, (oop)sig); }
|
|
428 u2 enclosing_method_class_index() const { return _enclosing_method_class_index; }
|
|
429 u2 enclosing_method_method_index() const { return _enclosing_method_method_index; }
|
|
430 void set_enclosing_method_indices(u2 class_index,
|
|
431 u2 method_index) { _enclosing_method_class_index = class_index;
|
|
432 _enclosing_method_method_index = method_index; }
|
|
433
|
|
434 // jmethodID support
|
|
435 static jmethodID jmethod_id_for_impl(instanceKlassHandle ik_h, methodHandle method_h);
|
|
436 jmethodID jmethod_id_or_null(methodOop method);
|
|
437
|
|
438 // cached itable index support
|
|
439 void set_cached_itable_index(size_t idnum, int index);
|
|
440 int cached_itable_index(size_t idnum);
|
|
441
|
|
442 // annotations support
|
|
443 typeArrayOop class_annotations() const { return _class_annotations; }
|
|
444 objArrayOop fields_annotations() const { return _fields_annotations; }
|
|
445 objArrayOop methods_annotations() const { return _methods_annotations; }
|
|
446 objArrayOop methods_parameter_annotations() const { return _methods_parameter_annotations; }
|
|
447 objArrayOop methods_default_annotations() const { return _methods_default_annotations; }
|
|
448 void set_class_annotations(typeArrayOop md) { oop_store_without_check((oop*)&_class_annotations, (oop)md); }
|
|
449 void set_fields_annotations(objArrayOop md) { set_annotations(md, &_fields_annotations); }
|
|
450 void set_methods_annotations(objArrayOop md) { set_annotations(md, &_methods_annotations); }
|
|
451 void set_methods_parameter_annotations(objArrayOop md) { set_annotations(md, &_methods_parameter_annotations); }
|
|
452 void set_methods_default_annotations(objArrayOop md) { set_annotations(md, &_methods_default_annotations); }
|
|
453 typeArrayOop get_method_annotations_of(int idnum)
|
|
454 { return get_method_annotations_from(idnum, _methods_annotations); }
|
|
455 typeArrayOop get_method_parameter_annotations_of(int idnum)
|
|
456 { return get_method_annotations_from(idnum, _methods_parameter_annotations); }
|
|
457 typeArrayOop get_method_default_annotations_of(int idnum)
|
|
458 { return get_method_annotations_from(idnum, _methods_default_annotations); }
|
|
459 void set_method_annotations_of(int idnum, typeArrayOop anno)
|
|
460 { set_methods_annotations_of(idnum, anno, &_methods_annotations); }
|
|
461 void set_method_parameter_annotations_of(int idnum, typeArrayOop anno)
|
|
462 { set_methods_annotations_of(idnum, anno, &_methods_annotations); }
|
|
463 void set_method_default_annotations_of(int idnum, typeArrayOop anno)
|
|
464 { set_methods_annotations_of(idnum, anno, &_methods_annotations); }
|
|
465
|
|
466 // allocation
|
|
467 DEFINE_ALLOCATE_PERMANENT(instanceKlass);
|
|
468 instanceOop allocate_instance(TRAPS);
|
|
469 instanceOop allocate_permanent_instance(TRAPS);
|
|
470
|
|
471 // additional member function to return a handle
|
|
472 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
|
|
473
|
|
474 objArrayOop allocate_objArray(int n, int length, TRAPS);
|
|
475 // Helper function
|
|
476 static instanceOop register_finalizer(instanceOop i, TRAPS);
|
|
477
|
|
478 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
|
|
479 // if not, throw either an Error or an Exception.
|
|
480 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
|
|
481
|
|
482 // initialization
|
|
483 void call_class_initializer(TRAPS);
|
|
484 void set_initialization_state_and_notify(ClassState state, TRAPS);
|
|
485
|
|
486 // OopMapCache support
|
|
487 OopMapCache* oop_map_cache() { return _oop_map_cache; }
|
|
488 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
|
|
489 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
|
|
490
|
|
491 // JNI identifier support (for static fields - for jni performance)
|
|
492 JNIid* jni_ids() { return _jni_ids; }
|
|
493 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
|
|
494 JNIid* jni_id_for(int offset);
|
|
495
|
|
496 // maintenance of deoptimization dependencies
|
|
497 int mark_dependent_nmethods(DepChange& changes);
|
|
498 void add_dependent_nmethod(nmethod* nm);
|
|
499 void remove_dependent_nmethod(nmethod* nm);
|
|
500
|
|
501 // On-stack replacement support
|
|
502 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
|
|
503 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
|
|
504 void add_osr_nmethod(nmethod* n);
|
|
505 void remove_osr_nmethod(nmethod* n);
|
|
506 nmethod* lookup_osr_nmethod(const methodOop m, int bci) const;
|
|
507
|
|
508 // Breakpoint support (see methods on methodOop for details)
|
|
509 BreakpointInfo* breakpoints() const { return _breakpoints; };
|
|
510 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
|
|
511
|
|
512 // support for stub routines
|
|
513 static int init_state_offset_in_bytes() { return offset_of(instanceKlass, _init_state); }
|
|
514 static int init_thread_offset_in_bytes() { return offset_of(instanceKlass, _init_thread); }
|
|
515
|
|
516 // subclass/subinterface checks
|
|
517 bool implements_interface(klassOop k) const;
|
|
518
|
|
519 // Access to implementors of an interface. We only store the count
|
|
520 // of implementors, and in case, there are only a few
|
|
521 // implementors, we store them in a short list.
|
|
522 // This accessor returns NULL if we walk off the end of the list.
|
|
523 klassOop implementor(int i) const {
|
|
524 return (i < implementors_limit)? _implementors[i]: (klassOop) NULL;
|
|
525 }
|
|
526 int nof_implementors() const { return _nof_implementors; }
|
|
527 void add_implementor(klassOop k); // k is a new class that implements this interface
|
|
528 void init_implementor(); // initialize
|
|
529
|
|
530 // link this class into the implementors list of every interface it implements
|
|
531 void process_interfaces(Thread *thread);
|
|
532
|
|
533 // virtual operations from Klass
|
|
534 bool is_leaf_class() const { return _subklass == NULL; }
|
|
535 objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS);
|
|
536 bool compute_is_subtype_of(klassOop k);
|
|
537 bool can_be_primary_super_slow() const;
|
|
538 klassOop java_super() const { return super(); }
|
|
539 int oop_size(oop obj) const { return size_helper(); }
|
|
540 int klass_oop_size() const { return object_size(); }
|
|
541 bool oop_is_instance_slow() const { return true; }
|
|
542
|
|
543 // Iterators
|
|
544 void do_local_static_fields(FieldClosure* cl);
|
|
545 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
|
|
546 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS);
|
|
547
|
|
548 void methods_do(void f(methodOop method));
|
|
549 void array_klasses_do(void f(klassOop k));
|
|
550 void with_array_klasses_do(void f(klassOop k));
|
|
551 bool super_types_do(SuperTypeClosure* blk);
|
|
552
|
|
553 // Casting from klassOop
|
|
554 static instanceKlass* cast(klassOop k) {
|
|
555 Klass* kp = k->klass_part();
|
|
556 assert(kp->null_vtbl() || kp->oop_is_instance_slow(), "cast to instanceKlass");
|
|
557 return (instanceKlass*) kp;
|
|
558 }
|
|
559
|
|
560 // Sizing (in words)
|
|
561 static int header_size() { return align_object_offset(oopDesc::header_size() + sizeof(instanceKlass)/HeapWordSize); }
|
|
562 int object_size() const { return object_size(align_object_offset(vtable_length()) + align_object_offset(itable_length()) + static_field_size() + nonstatic_oop_map_size()); }
|
|
563 static int vtable_start_offset() { return header_size(); }
|
|
564 static int vtable_length_offset() { return oopDesc::header_size() + offset_of(instanceKlass, _vtable_len) / HeapWordSize; }
|
|
565 static int object_size(int extra) { return align_object_size(header_size() + extra); }
|
|
566
|
|
567 intptr_t* start_of_vtable() const { return ((intptr_t*)as_klassOop()) + vtable_start_offset(); }
|
|
568 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
|
|
569 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)as_klassOop(); }
|
|
570
|
|
571 oop* start_of_static_fields() const { return (oop*)(start_of_itable() + align_object_offset(itable_length())); }
|
|
572 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
|
|
573 oop* end_of_static_fields() const { return start_of_static_fields() + static_field_size(); }
|
|
574 int offset_of_static_fields() const { return (intptr_t)start_of_static_fields() - (intptr_t)as_klassOop(); }
|
|
575
|
|
576 OopMapBlock* start_of_nonstatic_oop_maps() const { return (OopMapBlock*) (start_of_static_fields() + static_field_size()); }
|
|
577
|
|
578 // Allocation profiling support
|
|
579 juint alloc_size() const { return _alloc_count * size_helper(); }
|
|
580 void set_alloc_size(juint n) {}
|
|
581
|
|
582 // Use this to return the size of an instance in heap words:
|
|
583 int size_helper() const {
|
|
584 return layout_helper_to_size_helper(layout_helper());
|
|
585 }
|
|
586
|
|
587 // This bit is initialized in classFileParser.cpp.
|
|
588 // It is false under any of the following conditions:
|
|
589 // - the class is abstract (including any interface)
|
|
590 // - the class has a finalizer (if !RegisterFinalizersAtInit)
|
|
591 // - the class size is larger than FastAllocateSizeLimit
|
|
592 // - the class is java/lang/Class, which cannot be allocated directly
|
|
593 bool can_be_fastpath_allocated() const {
|
|
594 return !layout_helper_needs_slow_path(layout_helper());
|
|
595 }
|
|
596
|
|
597 // Java vtable/itable
|
|
598 klassVtable* vtable() const; // return new klassVtable wrapper
|
|
599 inline methodOop method_at_vtable(int index);
|
|
600 klassItable* itable() const; // return new klassItable wrapper
|
|
601 methodOop method_at_itable(klassOop holder, int index, TRAPS);
|
|
602
|
|
603 // Garbage collection
|
|
604 void oop_follow_contents(oop obj);
|
|
605 void follow_static_fields();
|
|
606 void adjust_static_fields();
|
|
607 int oop_adjust_pointers(oop obj);
|
|
608 bool object_is_parsable() const { return _init_state != unparsable_by_gc; }
|
|
609 // Value of _init_state must be zero (unparsable_by_gc) when klass field is set.
|
|
610
|
|
611 void follow_weak_klass_links(
|
|
612 BoolObjectClosure* is_alive, OopClosure* keep_alive);
|
|
613 void release_C_heap_structures();
|
|
614
|
|
615 // Parallel Scavenge and Parallel Old
|
|
616 PARALLEL_GC_DECLS
|
|
617
|
|
618 #ifndef SERIALGC
|
|
619 // Parallel Scavenge
|
|
620 void copy_static_fields(PSPromotionManager* pm);
|
|
621 void push_static_fields(PSPromotionManager* pm);
|
|
622
|
|
623 // Parallel Old
|
|
624 void follow_static_fields(ParCompactionManager* cm);
|
|
625 void copy_static_fields(ParCompactionManager* cm);
|
|
626 void update_static_fields();
|
|
627 void update_static_fields(HeapWord* beg_addr, HeapWord* end_addr);
|
|
628 #endif // SERIALGC
|
|
629
|
|
630 // Naming
|
|
631 char* signature_name() const;
|
|
632
|
|
633 // Iterators
|
|
634 int oop_oop_iterate(oop obj, OopClosure* blk) {
|
|
635 return oop_oop_iterate_v(obj, blk);
|
|
636 }
|
|
637
|
|
638 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
|
|
639 return oop_oop_iterate_v_m(obj, blk, mr);
|
|
640 }
|
|
641
|
|
642 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
|
|
643 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
|
|
644 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
|
|
645 MemRegion mr);
|
|
646
|
|
647 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
|
|
648 ALL_OOP_OOP_ITERATE_CLOSURES_3(InstanceKlass_OOP_OOP_ITERATE_DECL)
|
|
649
|
|
650 void iterate_static_fields(OopClosure* closure);
|
|
651 void iterate_static_fields(OopClosure* closure, MemRegion mr);
|
|
652
|
|
653 private:
|
|
654 // initialization state
|
|
655 #ifdef ASSERT
|
|
656 void set_init_state(ClassState state);
|
|
657 #else
|
|
658 void set_init_state(ClassState state) { _init_state = state; }
|
|
659 #endif
|
|
660 void set_rewritten() { _rewritten = true; }
|
|
661 void set_init_thread(Thread *thread) { _init_thread = thread; }
|
|
662
|
|
663 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
|
|
664 jmethodID* methods_jmethod_ids_acquire() const
|
|
665 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
|
|
666 void release_set_methods_jmethod_ids(jmethodID* jmeths)
|
|
667 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
|
|
668
|
|
669 int* methods_cached_itable_indices_acquire() const
|
|
670 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); }
|
|
671 void release_set_methods_cached_itable_indices(int* indices)
|
|
672 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); }
|
|
673
|
|
674 inline typeArrayOop get_method_annotations_from(int idnum, objArrayOop annos);
|
|
675 void set_annotations(objArrayOop md, objArrayOop* md_p) { oop_store_without_check((oop*)md_p, (oop)md); }
|
|
676 void set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p);
|
|
677
|
|
678 // Offsets for memory management
|
|
679 oop* adr_array_klasses() const { return (oop*)&this->_array_klasses;}
|
|
680 oop* adr_methods() const { return (oop*)&this->_methods;}
|
|
681 oop* adr_method_ordering() const { return (oop*)&this->_method_ordering;}
|
|
682 oop* adr_local_interfaces() const { return (oop*)&this->_local_interfaces;}
|
|
683 oop* adr_transitive_interfaces() const { return (oop*)&this->_transitive_interfaces;}
|
|
684 oop* adr_fields() const { return (oop*)&this->_fields;}
|
|
685 oop* adr_constants() const { return (oop*)&this->_constants;}
|
|
686 oop* adr_class_loader() const { return (oop*)&this->_class_loader;}
|
|
687 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;}
|
|
688 oop* adr_signers() const { return (oop*)&this->_signers;}
|
|
689 oop* adr_source_file_name() const { return (oop*)&this->_source_file_name;}
|
|
690 oop* adr_source_debug_extension() const { return (oop*)&this->_source_debug_extension;}
|
|
691 oop* adr_inner_classes() const { return (oop*)&this->_inner_classes;}
|
|
692 oop* adr_implementors() const { return (oop*)&this->_implementors[0];}
|
|
693 oop* adr_generic_signature() const { return (oop*)&this->_generic_signature;}
|
|
694 oop* adr_methods_jmethod_ids() const { return (oop*)&this->_methods_jmethod_ids;}
|
|
695 oop* adr_methods_cached_itable_indices() const { return (oop*)&this->_methods_cached_itable_indices;}
|
|
696 oop* adr_class_annotations() const { return (oop*)&this->_class_annotations;}
|
|
697 oop* adr_fields_annotations() const { return (oop*)&this->_fields_annotations;}
|
|
698 oop* adr_methods_annotations() const { return (oop*)&this->_methods_annotations;}
|
|
699 oop* adr_methods_parameter_annotations() const { return (oop*)&this->_methods_parameter_annotations;}
|
|
700 oop* adr_methods_default_annotations() const { return (oop*)&this->_methods_default_annotations;}
|
|
701
|
|
702 // Static methods that are used to implement member methods where an exposed this pointer
|
|
703 // is needed due to possible GCs
|
|
704 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
|
|
705 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
|
|
706 static void initialize_impl (instanceKlassHandle this_oop, TRAPS);
|
|
707 static void eager_initialize_impl (instanceKlassHandle this_oop);
|
|
708 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS);
|
|
709 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS);
|
|
710 static klassOop array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS);
|
|
711 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS);
|
|
712 /* jni_id_for_impl for jfieldID only */
|
|
713 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset);
|
|
714
|
|
715 // Returns the array class for the n'th dimension
|
|
716 klassOop array_klass_impl(bool or_null, int n, TRAPS);
|
|
717
|
|
718 // Returns the array class with this class as element type
|
|
719 klassOop array_klass_impl(bool or_null, TRAPS);
|
|
720
|
|
721 public:
|
|
722 // sharing support
|
|
723 virtual void remove_unshareable_info();
|
|
724 void field_names_and_sigs_iterate(OopClosure* closure);
|
|
725
|
|
726 // jvm support
|
|
727 jint compute_modifier_flags(TRAPS) const;
|
|
728
|
|
729 public:
|
|
730 // JVMTI support
|
|
731 jint jvmti_class_status() const;
|
|
732
|
|
733 #ifndef PRODUCT
|
|
734 public:
|
|
735 // Printing
|
|
736 void oop_print_on (oop obj, outputStream* st);
|
|
737 void oop_print_value_on(oop obj, outputStream* st);
|
|
738
|
|
739 void print_dependent_nmethods(bool verbose = false);
|
|
740 bool is_dependent_nmethod(nmethod* nm);
|
|
741 #endif
|
|
742
|
|
743 public:
|
|
744 // Verification
|
|
745 const char* internal_name() const;
|
|
746 void oop_verify_on(oop obj, outputStream* st);
|
|
747
|
|
748 #ifndef PRODUCT
|
|
749 static void verify_class_klass_nonstatic_oop_maps(klassOop k) PRODUCT_RETURN;
|
|
750 #endif
|
|
751 };
|
|
752
|
|
753 inline methodOop instanceKlass::method_at_vtable(int index) {
|
|
754 #ifndef PRODUCT
|
|
755 assert(index >= 0, "valid vtable index");
|
|
756 if (DebugVtables) {
|
|
757 verify_vtable_index(index);
|
|
758 }
|
|
759 #endif
|
|
760 vtableEntry* ve = (vtableEntry*)start_of_vtable();
|
|
761 return ve[index].method();
|
|
762 }
|
|
763
|
|
764 inline typeArrayOop instanceKlass::get_method_annotations_from(int idnum, objArrayOop annos) {
|
|
765 if (annos == NULL || annos->length() <= idnum) {
|
|
766 return NULL;
|
|
767 }
|
|
768 return typeArrayOop(annos->obj_at(idnum));
|
|
769 }
|
|
770
|
|
771 // for adding methods
|
|
772 // UNSET_IDNUM return means no more ids available
|
|
773 inline u2 instanceKlass::next_method_idnum() {
|
|
774 if (_idnum_allocated_count == constMethodOopDesc::MAX_IDNUM) {
|
|
775 return constMethodOopDesc::UNSET_IDNUM; // no more ids available
|
|
776 } else {
|
|
777 return _idnum_allocated_count++;
|
|
778 }
|
|
779 }
|
|
780
|
|
781
|
|
782 // ValueObjs embedded in klass. Describes where oops are located in instances of this klass.
|
|
783
|
|
784 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
|
|
785 private:
|
|
786 jushort _offset; // Offset of first oop in oop-map block
|
|
787 jushort _length; // Length of oop-map block
|
|
788 public:
|
|
789 // Accessors
|
|
790 jushort offset() const { return _offset; }
|
|
791 void set_offset(jushort offset) { _offset = offset; }
|
|
792
|
|
793 jushort length() const { return _length; }
|
|
794 void set_length(jushort length) { _length = length; }
|
|
795 };
|
|
796
|
|
797 /* JNIid class for jfieldIDs only */
|
|
798 class JNIid: public CHeapObj {
|
|
799 friend class VMStructs;
|
|
800 private:
|
|
801 klassOop _holder;
|
|
802 JNIid* _next;
|
|
803 int _offset;
|
|
804 #ifdef ASSERT
|
|
805 bool _is_static_field_id;
|
|
806 #endif
|
|
807
|
|
808 public:
|
|
809 // Accessors
|
|
810 klassOop holder() const { return _holder; }
|
|
811 int offset() const { return _offset; }
|
|
812 JNIid* next() { return _next; }
|
|
813 // Constructor
|
|
814 JNIid(klassOop holder, int offset, JNIid* next);
|
|
815 // Identifier lookup
|
|
816 JNIid* find(int offset);
|
|
817
|
|
818 // Garbage collection support
|
|
819 oop* holder_addr() { return (oop*)&_holder; }
|
|
820 void oops_do(OopClosure* f);
|
|
821 static void deallocate(JNIid* id);
|
|
822 // Debugging
|
|
823 #ifdef ASSERT
|
|
824 bool is_static_field_id() const { return _is_static_field_id; }
|
|
825 void set_is_static_field_id() { _is_static_field_id = true; }
|
|
826 #endif
|
|
827 void verify(klassOop holder);
|
|
828 };
|
|
829
|
|
830
|
|
831 // If breakpoints are more numerous than just JVMTI breakpoints,
|
|
832 // consider compressing this data structure.
|
|
833 // It is currently a simple linked list defined in methodOop.hpp.
|
|
834
|
|
835 class BreakpointInfo;
|
|
836
|
|
837
|
|
838 // A collection point for interesting information about the previous
|
|
839 // version(s) of an instanceKlass. This class uses weak references to
|
|
840 // the information so that the information may be collected as needed
|
|
841 // by the system. A GrowableArray of PreviousVersionNodes is attached
|
|
842 // to the instanceKlass as needed. See PreviousVersionWalker below.
|
|
843 class PreviousVersionNode : public CHeapObj {
|
|
844 private:
|
|
845 jweak _prev_constant_pool;
|
|
846 // If the previous version of the instanceKlass doesn't have any
|
|
847 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the
|
|
848 // EMCP methods have been collected, then _prev_EMCP_methods can
|
|
849 // have a length of zero.
|
|
850 GrowableArray<jweak>* _prev_EMCP_methods;
|
|
851
|
|
852 public:
|
|
853 PreviousVersionNode(jweak prev_constant_pool,
|
|
854 GrowableArray<jweak>* prev_EMCP_methods);
|
|
855 ~PreviousVersionNode();
|
|
856 jweak prev_constant_pool() const {
|
|
857 return _prev_constant_pool;
|
|
858 }
|
|
859 GrowableArray<jweak>* prev_EMCP_methods() const {
|
|
860 return _prev_EMCP_methods;
|
|
861 }
|
|
862 };
|
|
863
|
|
864
|
|
865 // A Handle-ized version of PreviousVersionNode.
|
|
866 class PreviousVersionInfo : public ResourceObj {
|
|
867 private:
|
|
868 constantPoolHandle _prev_constant_pool_handle;
|
|
869 // If the previous version of the instanceKlass doesn't have any
|
|
870 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the
|
|
871 // methods cannot be collected while we hold a handle,
|
|
872 // _prev_EMCP_methods should never have a length of zero.
|
|
873 GrowableArray<methodHandle>* _prev_EMCP_method_handles;
|
|
874
|
|
875 public:
|
|
876 PreviousVersionInfo(PreviousVersionNode *pv_node);
|
|
877 ~PreviousVersionInfo();
|
|
878 constantPoolHandle prev_constant_pool_handle() const {
|
|
879 return _prev_constant_pool_handle;
|
|
880 }
|
|
881 GrowableArray<methodHandle>* prev_EMCP_method_handles() const {
|
|
882 return _prev_EMCP_method_handles;
|
|
883 }
|
|
884 };
|
|
885
|
|
886
|
|
887 // Helper object for walking previous versions. This helper cleans up
|
|
888 // the Handles that it allocates when the helper object is destroyed.
|
|
889 // The PreviousVersionInfo object returned by next_previous_version()
|
|
890 // is only valid until a subsequent call to next_previous_version() or
|
|
891 // the helper object is destroyed.
|
|
892 class PreviousVersionWalker : public StackObj {
|
|
893 private:
|
|
894 GrowableArray<PreviousVersionNode *>* _previous_versions;
|
|
895 int _current_index;
|
|
896 // Fields for cleaning up when we are done walking the previous versions:
|
|
897 // A HandleMark for the PreviousVersionInfo handles:
|
|
898 HandleMark _hm;
|
|
899
|
|
900 // It would be nice to have a ResourceMark field in this helper also,
|
|
901 // but the ResourceMark code says to be careful to delete handles held
|
|
902 // in GrowableArrays _before_ deleting the GrowableArray. Since we
|
|
903 // can't guarantee the order in which the fields are destroyed, we
|
|
904 // have to let the creator of the PreviousVersionWalker object do
|
|
905 // the right thing. Also, adding a ResourceMark here causes an
|
|
906 // include loop.
|
|
907
|
|
908 // A pointer to the current info object so we can handle the deletes.
|
|
909 PreviousVersionInfo * _current_p;
|
|
910
|
|
911 public:
|
|
912 PreviousVersionWalker(instanceKlass *ik);
|
|
913 ~PreviousVersionWalker();
|
|
914
|
|
915 // Return the interesting information for the next previous version
|
|
916 // of the klass. Returns NULL if there are no more previous versions.
|
|
917 PreviousVersionInfo* next_previous_version();
|
|
918 };
|