0
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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 # include "incls/_precompiled.incl"
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26 # include "incls/_systemDictionary.cpp.incl"
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27
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28
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29 Dictionary* SystemDictionary::_dictionary = NULL;
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30 PlaceholderTable* SystemDictionary::_placeholders = NULL;
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31 Dictionary* SystemDictionary::_shared_dictionary = NULL;
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32 LoaderConstraintTable* SystemDictionary::_loader_constraints = NULL;
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33 ResolutionErrorTable* SystemDictionary::_resolution_errors = NULL;
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34
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35
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36 int SystemDictionary::_number_of_modifications = 0;
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37
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38 oop SystemDictionary::_system_loader_lock_obj = NULL;
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39
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40 klassOop SystemDictionary::_object_klass = NULL;
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41 klassOop SystemDictionary::_string_klass = NULL;
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42 klassOop SystemDictionary::_class_klass = NULL;
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43 klassOop SystemDictionary::_cloneable_klass = NULL;
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44 klassOop SystemDictionary::_classloader_klass = NULL;
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45 klassOop SystemDictionary::_serializable_klass = NULL;
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46 klassOop SystemDictionary::_system_klass = NULL;
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47
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48 klassOop SystemDictionary::_throwable_klass = NULL;
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49 klassOop SystemDictionary::_error_klass = NULL;
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50 klassOop SystemDictionary::_threaddeath_klass = NULL;
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51 klassOop SystemDictionary::_exception_klass = NULL;
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52 klassOop SystemDictionary::_runtime_exception_klass = NULL;
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53 klassOop SystemDictionary::_classNotFoundException_klass = NULL;
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54 klassOop SystemDictionary::_noClassDefFoundError_klass = NULL;
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55 klassOop SystemDictionary::_linkageError_klass = NULL;
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56 klassOop SystemDictionary::_classCastException_klass = NULL;
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57 klassOop SystemDictionary::_arrayStoreException_klass = NULL;
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58 klassOop SystemDictionary::_virtualMachineError_klass = NULL;
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59 klassOop SystemDictionary::_outOfMemoryError_klass = NULL;
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60 klassOop SystemDictionary::_StackOverflowError_klass = NULL;
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61 klassOop SystemDictionary::_illegalMonitorStateException_klass = NULL;
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62 klassOop SystemDictionary::_protectionDomain_klass = NULL;
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63 klassOop SystemDictionary::_AccessControlContext_klass = NULL;
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64
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65 klassOop SystemDictionary::_reference_klass = NULL;
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66 klassOop SystemDictionary::_soft_reference_klass = NULL;
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67 klassOop SystemDictionary::_weak_reference_klass = NULL;
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68 klassOop SystemDictionary::_final_reference_klass = NULL;
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69 klassOop SystemDictionary::_phantom_reference_klass = NULL;
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70 klassOop SystemDictionary::_finalizer_klass = NULL;
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71
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72 klassOop SystemDictionary::_thread_klass = NULL;
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73 klassOop SystemDictionary::_threadGroup_klass = NULL;
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74 klassOop SystemDictionary::_properties_klass = NULL;
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75 klassOop SystemDictionary::_reflect_accessible_object_klass = NULL;
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76 klassOop SystemDictionary::_reflect_field_klass = NULL;
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77 klassOop SystemDictionary::_reflect_method_klass = NULL;
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78 klassOop SystemDictionary::_reflect_constructor_klass = NULL;
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79 klassOop SystemDictionary::_reflect_magic_klass = NULL;
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80 klassOop SystemDictionary::_reflect_method_accessor_klass = NULL;
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81 klassOop SystemDictionary::_reflect_constructor_accessor_klass = NULL;
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82 klassOop SystemDictionary::_reflect_delegating_classloader_klass = NULL;
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83 klassOop SystemDictionary::_reflect_constant_pool_klass = NULL;
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84 klassOop SystemDictionary::_reflect_unsafe_static_field_accessor_impl_klass = NULL;
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85
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86 klassOop SystemDictionary::_vector_klass = NULL;
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87 klassOop SystemDictionary::_hashtable_klass = NULL;
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88 klassOop SystemDictionary::_stringBuffer_klass = NULL;
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89
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90 klassOop SystemDictionary::_stackTraceElement_klass = NULL;
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91
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92 klassOop SystemDictionary::_java_nio_Buffer_klass = NULL;
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93
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94 klassOop SystemDictionary::_sun_misc_AtomicLongCSImpl_klass = NULL;
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95 klassOop SystemDictionary::_sun_jkernel_DownloadManager_klass = NULL;
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96
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97 klassOop SystemDictionary::_boolean_klass = NULL;
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98 klassOop SystemDictionary::_char_klass = NULL;
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99 klassOop SystemDictionary::_float_klass = NULL;
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100 klassOop SystemDictionary::_double_klass = NULL;
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101 klassOop SystemDictionary::_byte_klass = NULL;
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102 klassOop SystemDictionary::_short_klass = NULL;
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103 klassOop SystemDictionary::_int_klass = NULL;
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104 klassOop SystemDictionary::_long_klass = NULL;
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105 klassOop SystemDictionary::_box_klasses[T_VOID+1] = { NULL /*, NULL...*/ };
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106
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107 oop SystemDictionary::_java_system_loader = NULL;
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108
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109 bool SystemDictionary::_has_loadClassInternal = false;
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110 bool SystemDictionary::_has_checkPackageAccess = false;
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111
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112 // lazily initialized klass variables
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113 volatile klassOop SystemDictionary::_abstract_ownable_synchronizer_klass = NULL;
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114
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115
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116 // ----------------------------------------------------------------------------
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117 // Java-level SystemLoader
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118
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119 oop SystemDictionary::java_system_loader() {
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120 return _java_system_loader;
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121 }
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122
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123 void SystemDictionary::compute_java_system_loader(TRAPS) {
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124 KlassHandle system_klass(THREAD, _classloader_klass);
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125 JavaValue result(T_OBJECT);
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126 JavaCalls::call_static(&result,
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127 KlassHandle(THREAD, _classloader_klass),
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128 vmSymbolHandles::getSystemClassLoader_name(),
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129 vmSymbolHandles::void_classloader_signature(),
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130 CHECK);
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131
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132 _java_system_loader = (oop)result.get_jobject();
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133 }
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134
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135
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136 // ----------------------------------------------------------------------------
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137 // debugging
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138
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139 #ifdef ASSERT
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140
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141 // return true if class_name contains no '.' (internal format is '/')
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142 bool SystemDictionary::is_internal_format(symbolHandle class_name) {
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143 if (class_name.not_null()) {
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144 ResourceMark rm;
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145 char* name = class_name->as_C_string();
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146 return strchr(name, '.') == NULL;
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147 } else {
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148 return true;
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149 }
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150 }
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151
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152 #endif
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153
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154 // ----------------------------------------------------------------------------
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155 // Resolving of classes
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156
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157 // Forwards to resolve_or_null
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158
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159 klassOop SystemDictionary::resolve_or_fail(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS) {
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160 klassOop klass = resolve_or_null(class_name, class_loader, protection_domain, THREAD);
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161 if (HAS_PENDING_EXCEPTION || klass == NULL) {
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162 KlassHandle k_h(THREAD, klass);
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163 // can return a null klass
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164 klass = handle_resolution_exception(class_name, class_loader, protection_domain, throw_error, k_h, THREAD);
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165 }
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166 return klass;
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167 }
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168
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169 klassOop SystemDictionary::handle_resolution_exception(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS) {
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170 if (HAS_PENDING_EXCEPTION) {
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171 // If we have a pending exception we forward it to the caller, unless throw_error is true,
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172 // in which case we have to check whether the pending exception is a ClassNotFoundException,
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173 // and if so convert it to a NoClassDefFoundError
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174 // And chain the original ClassNotFoundException
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175 if (throw_error && PENDING_EXCEPTION->is_a(SystemDictionary::classNotFoundException_klass())) {
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176 ResourceMark rm(THREAD);
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177 assert(klass_h() == NULL, "Should not have result with exception pending");
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178 Handle e(THREAD, PENDING_EXCEPTION);
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179 CLEAR_PENDING_EXCEPTION;
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180 THROW_MSG_CAUSE_0(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string(), e);
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181 } else {
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182 return NULL;
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183 }
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184 }
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185 // Class not found, throw appropriate error or exception depending on value of throw_error
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186 if (klass_h() == NULL) {
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187 ResourceMark rm(THREAD);
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188 if (throw_error) {
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189 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string());
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190 } else {
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191 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), class_name->as_C_string());
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192 }
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193 }
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194 return (klassOop)klass_h();
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195 }
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196
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197
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198 klassOop SystemDictionary::resolve_or_fail(symbolHandle class_name,
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199 bool throw_error, TRAPS)
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200 {
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201 return resolve_or_fail(class_name, Handle(), Handle(), throw_error, THREAD);
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202 }
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203
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204
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205 // Forwards to resolve_instance_class_or_null
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206
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207 klassOop SystemDictionary::resolve_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS) {
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208 assert(!THREAD->is_Compiler_thread(), "Can not load classes with the Compiler thread");
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209 if (FieldType::is_array(class_name())) {
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210 return resolve_array_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL);
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211 } else {
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212 return resolve_instance_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL);
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213 }
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214 }
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215
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216 klassOop SystemDictionary::resolve_or_null(symbolHandle class_name, TRAPS) {
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217 return resolve_or_null(class_name, Handle(), Handle(), THREAD);
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218 }
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219
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220 // Forwards to resolve_instance_class_or_null
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221
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222 klassOop SystemDictionary::resolve_array_class_or_null(symbolHandle class_name,
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223 Handle class_loader,
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224 Handle protection_domain,
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225 TRAPS) {
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226 assert(FieldType::is_array(class_name()), "must be array");
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227 jint dimension;
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228 symbolOop object_key;
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229 klassOop k = NULL;
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230 // dimension and object_key are assigned as a side-effect of this call
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231 BasicType t = FieldType::get_array_info(class_name(),
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232 &dimension,
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233 &object_key,
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234 CHECK_NULL);
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235
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236 if (t == T_OBJECT) {
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237 symbolHandle h_key(THREAD, object_key);
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238 // naked oop "k" is OK here -- we assign back into it
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239 k = SystemDictionary::resolve_instance_class_or_null(h_key,
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240 class_loader,
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241 protection_domain,
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242 CHECK_NULL);
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243 if (k != NULL) {
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244 k = Klass::cast(k)->array_klass(dimension, CHECK_NULL);
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245 }
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246 } else {
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247 k = Universe::typeArrayKlassObj(t);
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248 k = typeArrayKlass::cast(k)->array_klass(dimension, CHECK_NULL);
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249 }
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250 return k;
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251 }
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252
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253
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254 // Must be called for any super-class or super-interface resolution
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255 // during class definition to allow class circularity checking
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256 // super-interface callers:
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257 // parse_interfaces - for defineClass & jvmtiRedefineClasses
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258 // super-class callers:
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259 // ClassFileParser - for defineClass & jvmtiRedefineClasses
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260 // load_shared_class - while loading a class from shared archive
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261 // resolve_instance_class_or_fail:
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262 // when resolving a class that has an existing placeholder with
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263 // a saved superclass [i.e. a defineClass is currently in progress]
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264 // if another thread is trying to resolve the class, it must do
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265 // super-class checks on its own thread to catch class circularity
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266 // This last call is critical in class circularity checking for cases
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267 // where classloading is delegated to different threads and the
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268 // classloader lock is released.
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269 // Take the case: Base->Super->Base
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270 // 1. If thread T1 tries to do a defineClass of class Base
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271 // resolve_super_or_fail creates placeholder: T1, Base (super Super)
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272 // 2. resolve_instance_class_or_null does not find SD or placeholder for Super
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273 // so it tries to load Super
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274 // 3. If we load the class internally, or user classloader uses same thread
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275 // loadClassFromxxx or defineClass via parseClassFile Super ...
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276 // 3.1 resolve_super_or_fail creates placeholder: T1, Super (super Base)
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277 // 3.3 resolve_instance_class_or_null Base, finds placeholder for Base
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278 // 3.4 calls resolve_super_or_fail Base
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279 // 3.5 finds T1,Base -> throws class circularity
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280 //OR 4. If T2 tries to resolve Super via defineClass Super ...
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281 // 4.1 resolve_super_or_fail creates placeholder: T2, Super (super Base)
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282 // 4.2 resolve_instance_class_or_null Base, finds placeholder for Base (super Super)
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283 // 4.3 calls resolve_super_or_fail Super in parallel on own thread T2
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284 // 4.4 finds T2, Super -> throws class circularity
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285 // Must be called, even if superclass is null, since this is
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286 // where the placeholder entry is created which claims this
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287 // thread is loading this class/classloader.
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288 klassOop SystemDictionary::resolve_super_or_fail(symbolHandle child_name,
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289 symbolHandle class_name,
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290 Handle class_loader,
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291 Handle protection_domain,
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292 bool is_superclass,
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293 TRAPS) {
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294
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295 // Double-check, if child class is already loaded, just return super-class,interface
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296 // Don't add a placedholder if already loaded, i.e. already in system dictionary
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297 // Make sure there's a placeholder for the *child* before resolving.
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298 // Used as a claim that this thread is currently loading superclass/classloader
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299 // Used here for ClassCircularity checks and also for heap verification
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300 // (every instanceKlass in the heap needs to be in the system dictionary
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301 // or have a placeholder).
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302 // Must check ClassCircularity before checking if super class is already loaded
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303 //
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304 // We might not already have a placeholder if this child_name was
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305 // first seen via resolve_from_stream (jni_DefineClass or JVM_DefineClass);
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306 // the name of the class might not be known until the stream is actually
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307 // parsed.
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308 // Bugs 4643874, 4715493
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309 // compute_hash can have a safepoint
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310
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311 unsigned int d_hash = dictionary()->compute_hash(child_name, class_loader);
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312 int d_index = dictionary()->hash_to_index(d_hash);
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313 unsigned int p_hash = placeholders()->compute_hash(child_name, class_loader);
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314 int p_index = placeholders()->hash_to_index(p_hash);
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315 // can't throw error holding a lock
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316 bool child_already_loaded = false;
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317 bool throw_circularity_error = false;
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318 {
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319 MutexLocker mu(SystemDictionary_lock, THREAD);
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320 klassOop childk = find_class(d_index, d_hash, child_name, class_loader);
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321 klassOop quicksuperk;
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322 // to support // loading: if child done loading, just return superclass
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323 // if class_name, & class_loader don't match:
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324 // if initial define, SD update will give LinkageError
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325 // if redefine: compare_class_versions will give HIERARCHY_CHANGED
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326 // so we don't throw an exception here.
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327 // see: nsk redefclass014 & java.lang.instrument Instrument032
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328 if ((childk != NULL ) && (is_superclass) &&
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329 ((quicksuperk = instanceKlass::cast(childk)->super()) != NULL) &&
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330
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331 ((Klass::cast(quicksuperk)->name() == class_name()) &&
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332 (Klass::cast(quicksuperk)->class_loader() == class_loader()))) {
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333 return quicksuperk;
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334 } else {
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335 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, class_loader);
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336 if (probe && probe->check_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER)) {
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337 throw_circularity_error = true;
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338 }
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339
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340 // add placeholder entry even if error - callers will remove on error
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341 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, child_name, class_loader, PlaceholderTable::LOAD_SUPER, class_name, THREAD);
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342 if (throw_circularity_error) {
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343 newprobe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER);
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344 }
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345 }
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346 }
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347 if (throw_circularity_error) {
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348 ResourceMark rm(THREAD);
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349 THROW_MSG_0(vmSymbols::java_lang_ClassCircularityError(), child_name->as_C_string());
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350 }
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351
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352 // java.lang.Object should have been found above
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353 assert(class_name() != NULL, "null super class for resolving");
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354 // Resolve the super class or interface, check results on return
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355 klassOop superk = NULL;
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356 superk = SystemDictionary::resolve_or_null(class_name,
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357 class_loader,
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358 protection_domain,
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359 THREAD);
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360
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361 KlassHandle superk_h(THREAD, superk);
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362
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363 // Note: clean up of placeholders currently in callers of
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364 // resolve_super_or_fail - either at update_dictionary time
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365 // or on error
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366 {
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367 MutexLocker mu(SystemDictionary_lock, THREAD);
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368 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, class_loader);
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369 if (probe != NULL) {
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370 probe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER);
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371 }
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372 }
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373 if (HAS_PENDING_EXCEPTION || superk_h() == NULL) {
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374 // can null superk
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375 superk_h = KlassHandle(THREAD, handle_resolution_exception(class_name, class_loader, protection_domain, true, superk_h, THREAD));
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376 }
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377
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378 return superk_h();
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379 }
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380
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381
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382 void SystemDictionary::validate_protection_domain(instanceKlassHandle klass,
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383 Handle class_loader,
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384 Handle protection_domain,
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385 TRAPS) {
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386 if(!has_checkPackageAccess()) return;
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387
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388 // Now we have to call back to java to check if the initating class has access
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389 JavaValue result(T_VOID);
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390 if (TraceProtectionDomainVerification) {
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391 // Print out trace information
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392 tty->print_cr("Checking package access");
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393 tty->print(" - class loader: "); class_loader()->print_value_on(tty); tty->cr();
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394 tty->print(" - protection domain: "); protection_domain()->print_value_on(tty); tty->cr();
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395 tty->print(" - loading: "); klass()->print_value_on(tty); tty->cr();
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396 }
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397
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398 assert(class_loader() != NULL, "should not have non-null protection domain for null classloader");
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399
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400 KlassHandle system_loader(THREAD, SystemDictionary::classloader_klass());
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401 JavaCalls::call_special(&result,
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402 class_loader,
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403 system_loader,
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404 vmSymbolHandles::checkPackageAccess_name(),
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405 vmSymbolHandles::class_protectiondomain_signature(),
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406 Handle(THREAD, klass->java_mirror()),
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407 protection_domain,
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408 THREAD);
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409
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410 if (TraceProtectionDomainVerification) {
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411 if (HAS_PENDING_EXCEPTION) {
|
|
412 tty->print_cr(" -> DENIED !!!!!!!!!!!!!!!!!!!!!");
|
|
413 } else {
|
|
414 tty->print_cr(" -> granted");
|
|
415 }
|
|
416 tty->cr();
|
|
417 }
|
|
418
|
|
419 if (HAS_PENDING_EXCEPTION) return;
|
|
420
|
|
421 // If no exception has been thrown, we have validated the protection domain
|
|
422 // Insert the protection domain of the initiating class into the set.
|
|
423 {
|
|
424 // We recalculate the entry here -- we've called out to java since
|
|
425 // the last time it was calculated.
|
|
426 symbolHandle kn(THREAD, klass->name());
|
|
427 unsigned int d_hash = dictionary()->compute_hash(kn, class_loader);
|
|
428 int d_index = dictionary()->hash_to_index(d_hash);
|
|
429
|
|
430 MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
431 {
|
|
432 // Note that we have an entry, and entries can be deleted only during GC,
|
|
433 // so we cannot allow GC to occur while we're holding this entry.
|
|
434
|
|
435 // We're using a No_Safepoint_Verifier to catch any place where we
|
|
436 // might potentially do a GC at all.
|
|
437 // SystemDictionary::do_unloading() asserts that classes are only
|
|
438 // unloaded at a safepoint.
|
|
439 No_Safepoint_Verifier nosafepoint;
|
|
440 dictionary()->add_protection_domain(d_index, d_hash, klass, class_loader,
|
|
441 protection_domain, THREAD);
|
|
442 }
|
|
443 }
|
|
444 }
|
|
445
|
|
446 // We only get here if this thread finds that another thread
|
|
447 // has already claimed the placeholder token for the current operation,
|
|
448 // but that other thread either never owned or gave up the
|
|
449 // object lock
|
|
450 // Waits on SystemDictionary_lock to indicate placeholder table updated
|
|
451 // On return, caller must recheck placeholder table state
|
|
452 //
|
|
453 // We only get here if
|
|
454 // 1) custom classLoader, i.e. not bootstrap classloader
|
|
455 // 2) UnsyncloadClass not set
|
|
456 // 3) custom classLoader has broken the class loader objectLock
|
|
457 // so another thread got here in parallel
|
|
458 //
|
|
459 // lockObject must be held.
|
|
460 // Complicated dance due to lock ordering:
|
|
461 // Must first release the classloader object lock to
|
|
462 // allow initial definer to complete the class definition
|
|
463 // and to avoid deadlock
|
|
464 // Reclaim classloader lock object with same original recursion count
|
|
465 // Must release SystemDictionary_lock after notify, since
|
|
466 // class loader lock must be claimed before SystemDictionary_lock
|
|
467 // to prevent deadlocks
|
|
468 //
|
|
469 // The notify allows applications that did an untimed wait() on
|
|
470 // the classloader object lock to not hang.
|
|
471 void SystemDictionary::double_lock_wait(Handle lockObject, TRAPS) {
|
|
472 assert_lock_strong(SystemDictionary_lock);
|
|
473
|
|
474 bool calledholdinglock
|
|
475 = ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, lockObject);
|
|
476 assert(calledholdinglock,"must hold lock for notify");
|
|
477 assert(!UnsyncloadClass, "unexpected double_lock_wait");
|
|
478 ObjectSynchronizer::notifyall(lockObject, THREAD);
|
|
479 intptr_t recursions = ObjectSynchronizer::complete_exit(lockObject, THREAD);
|
|
480 SystemDictionary_lock->wait();
|
|
481 SystemDictionary_lock->unlock();
|
|
482 ObjectSynchronizer::reenter(lockObject, recursions, THREAD);
|
|
483 SystemDictionary_lock->lock();
|
|
484 }
|
|
485
|
|
486 // If the class in is in the placeholder table, class loading is in progress
|
|
487 // For cases where the application changes threads to load classes, it
|
|
488 // is critical to ClassCircularity detection that we try loading
|
|
489 // the superclass on the same thread internally, so we do parallel
|
|
490 // super class loading here.
|
|
491 // This also is critical in cases where the original thread gets stalled
|
|
492 // even in non-circularity situations.
|
|
493 // Note: only one thread can define the class, but multiple can resolve
|
|
494 // Note: must call resolve_super_or_fail even if null super -
|
|
495 // to force placeholder entry creation for this class
|
|
496 // Caller must check for pending exception
|
|
497 // Returns non-null klassOop if other thread has completed load
|
|
498 // and we are done,
|
|
499 // If return null klassOop and no pending exception, the caller must load the class
|
|
500 instanceKlassHandle SystemDictionary::handle_parallel_super_load(
|
|
501 symbolHandle name, symbolHandle superclassname, Handle class_loader,
|
|
502 Handle protection_domain, Handle lockObject, TRAPS) {
|
|
503
|
|
504 instanceKlassHandle nh = instanceKlassHandle(); // null Handle
|
|
505 unsigned int d_hash = dictionary()->compute_hash(name, class_loader);
|
|
506 int d_index = dictionary()->hash_to_index(d_hash);
|
|
507 unsigned int p_hash = placeholders()->compute_hash(name, class_loader);
|
|
508 int p_index = placeholders()->hash_to_index(p_hash);
|
|
509
|
|
510 // superk is not used, resolve_super called for circularity check only
|
|
511 // This code is reached in two situations. One if this thread
|
|
512 // is loading the same class twice (e.g. ClassCircularity, or
|
|
513 // java.lang.instrument).
|
|
514 // The second is if another thread started the resolve_super first
|
|
515 // and has not yet finished.
|
|
516 // In both cases the original caller will clean up the placeholder
|
|
517 // entry on error.
|
|
518 klassOop superk = SystemDictionary::resolve_super_or_fail(name,
|
|
519 superclassname,
|
|
520 class_loader,
|
|
521 protection_domain,
|
|
522 true,
|
|
523 CHECK_(nh));
|
|
524 // We don't redefine the class, so we just need to clean up if there
|
|
525 // was not an error (don't want to modify any system dictionary
|
|
526 // data structures).
|
|
527 {
|
|
528 MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
529 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD);
|
|
530 SystemDictionary_lock->notify_all();
|
|
531 }
|
|
532
|
|
533 // UnsyncloadClass does NOT wait for parallel superclass loads to complete
|
|
534 // Bootstrap classloader does wait for parallel superclass loads
|
|
535 if (UnsyncloadClass) {
|
|
536 MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
537 // Check if classloading completed while we were loading superclass or waiting
|
|
538 klassOop check = find_class(d_index, d_hash, name, class_loader);
|
|
539 if (check != NULL) {
|
|
540 // Klass is already loaded, so just return it
|
|
541 return(instanceKlassHandle(THREAD, check));
|
|
542 } else {
|
|
543 return nh;
|
|
544 }
|
|
545 }
|
|
546
|
|
547 // must loop to both handle other placeholder updates
|
|
548 // and spurious notifications
|
|
549 bool super_load_in_progress = true;
|
|
550 PlaceholderEntry* placeholder;
|
|
551 while (super_load_in_progress) {
|
|
552 MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
553 // Check if classloading completed while we were loading superclass or waiting
|
|
554 klassOop check = find_class(d_index, d_hash, name, class_loader);
|
|
555 if (check != NULL) {
|
|
556 // Klass is already loaded, so just return it
|
|
557 return(instanceKlassHandle(THREAD, check));
|
|
558 } else {
|
|
559 placeholder = placeholders()->get_entry(p_index, p_hash, name, class_loader);
|
|
560 if (placeholder && placeholder->super_load_in_progress() ){
|
|
561 // Before UnsyncloadClass:
|
|
562 // We only get here if the application has released the
|
|
563 // classloader lock when another thread was in the middle of loading a
|
|
564 // superclass/superinterface for this class, and now
|
|
565 // this thread is also trying to load this class.
|
|
566 // To minimize surprises, the first thread that started to
|
|
567 // load a class should be the one to complete the loading
|
|
568 // with the classfile it initially expected.
|
|
569 // This logic has the current thread wait once it has done
|
|
570 // all the superclass/superinterface loading it can, until
|
|
571 // the original thread completes the class loading or fails
|
|
572 // If it completes we will use the resulting instanceKlass
|
|
573 // which we will find below in the systemDictionary.
|
|
574 // We also get here for parallel bootstrap classloader
|
|
575 if (class_loader.is_null()) {
|
|
576 SystemDictionary_lock->wait();
|
|
577 } else {
|
|
578 double_lock_wait(lockObject, THREAD);
|
|
579 }
|
|
580 } else {
|
|
581 // If not in SD and not in PH, other thread's load must have failed
|
|
582 super_load_in_progress = false;
|
|
583 }
|
|
584 }
|
|
585 }
|
|
586 return (nh);
|
|
587 }
|
|
588
|
|
589
|
|
590 klassOop SystemDictionary::resolve_instance_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS) {
|
|
591 assert(class_name.not_null() && !FieldType::is_array(class_name()), "invalid class name");
|
|
592 // First check to see if we should remove wrapping L and ;
|
|
593 symbolHandle name;
|
|
594 if (FieldType::is_obj(class_name())) {
|
|
595 ResourceMark rm(THREAD);
|
|
596 // Ignore wrapping L and ;.
|
|
597 name = oopFactory::new_symbol_handle(class_name()->as_C_string() + 1, class_name()->utf8_length() - 2, CHECK_NULL);
|
|
598 } else {
|
|
599 name = class_name;
|
|
600 }
|
|
601
|
|
602 // UseNewReflection
|
|
603 // Fix for 4474172; see evaluation for more details
|
|
604 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader()));
|
|
605
|
|
606 // Do lookup to see if class already exist and the protection domain
|
|
607 // has the right access
|
|
608 unsigned int d_hash = dictionary()->compute_hash(name, class_loader);
|
|
609 int d_index = dictionary()->hash_to_index(d_hash);
|
|
610 klassOop probe = dictionary()->find(d_index, d_hash, name, class_loader,
|
|
611 protection_domain, THREAD);
|
|
612 if (probe != NULL) return probe;
|
|
613
|
|
614
|
|
615 // Non-bootstrap class loaders will call out to class loader and
|
|
616 // define via jvm/jni_DefineClass which will acquire the
|
|
617 // class loader object lock to protect against multiple threads
|
|
618 // defining the class in parallel by accident.
|
|
619 // This lock must be acquired here so the waiter will find
|
|
620 // any successful result in the SystemDictionary and not attempt
|
|
621 // the define
|
|
622 // Classloaders that support parallelism, e.g. bootstrap classloader,
|
|
623 // or all classloaders with UnsyncloadClass do not acquire lock here
|
|
624 bool DoObjectLock = true;
|
|
625 if (UnsyncloadClass || (class_loader.is_null())) {
|
|
626 DoObjectLock = false;
|
|
627 }
|
|
628
|
|
629 unsigned int p_hash = placeholders()->compute_hash(name, class_loader);
|
|
630 int p_index = placeholders()->hash_to_index(p_hash);
|
|
631
|
|
632 // Class is not in SystemDictionary so we have to do loading.
|
|
633 // Make sure we are synchronized on the class loader before we proceed
|
|
634 Handle lockObject = compute_loader_lock_object(class_loader, THREAD);
|
|
635 check_loader_lock_contention(lockObject, THREAD);
|
|
636 ObjectLocker ol(lockObject, THREAD, DoObjectLock);
|
|
637
|
|
638 // Check again (after locking) if class already exist in SystemDictionary
|
|
639 bool class_has_been_loaded = false;
|
|
640 bool super_load_in_progress = false;
|
|
641 bool havesupername = false;
|
|
642 instanceKlassHandle k;
|
|
643 PlaceholderEntry* placeholder;
|
|
644 symbolHandle superclassname;
|
|
645
|
|
646 {
|
|
647 MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
648 klassOop check = find_class(d_index, d_hash, name, class_loader);
|
|
649 if (check != NULL) {
|
|
650 // Klass is already loaded, so just return it
|
|
651 class_has_been_loaded = true;
|
|
652 k = instanceKlassHandle(THREAD, check);
|
|
653 } else {
|
|
654 placeholder = placeholders()->get_entry(p_index, p_hash, name, class_loader);
|
|
655 if (placeholder && placeholder->super_load_in_progress()) {
|
|
656 super_load_in_progress = true;
|
|
657 if (placeholder->havesupername() == true) {
|
|
658 superclassname = symbolHandle(THREAD, placeholder->supername());
|
|
659 havesupername = true;
|
|
660 }
|
|
661 }
|
|
662 }
|
|
663 }
|
|
664
|
|
665 // If the class in is in the placeholder table, class loading is in progress
|
|
666 if (super_load_in_progress && havesupername==true) {
|
|
667 k = SystemDictionary::handle_parallel_super_load(name, superclassname,
|
|
668 class_loader, protection_domain, lockObject, THREAD);
|
|
669 if (HAS_PENDING_EXCEPTION) {
|
|
670 return NULL;
|
|
671 }
|
|
672 if (!k.is_null()) {
|
|
673 class_has_been_loaded = true;
|
|
674 }
|
|
675 }
|
|
676
|
|
677 if (!class_has_been_loaded) {
|
|
678
|
|
679 // add placeholder entry to record loading instance class
|
|
680 // Five cases:
|
|
681 // All cases need to prevent modifying bootclasssearchpath
|
|
682 // in parallel with a classload of same classname
|
|
683 // case 1. traditional classloaders that rely on the classloader object lock
|
|
684 // - no other need for LOAD_INSTANCE
|
|
685 // case 2. traditional classloaders that break the classloader object lock
|
|
686 // as a deadlock workaround. Detection of this case requires that
|
|
687 // this check is done while holding the classloader object lock,
|
|
688 // and that lock is still held when calling classloader's loadClass.
|
|
689 // For these classloaders, we ensure that the first requestor
|
|
690 // completes the load and other requestors wait for completion.
|
|
691 // case 3. UnsyncloadClass - don't use objectLocker
|
|
692 // With this flag, we allow parallel classloading of a
|
|
693 // class/classloader pair
|
|
694 // case4. Bootstrap classloader - don't own objectLocker
|
|
695 // This classloader supports parallelism at the classloader level,
|
|
696 // but only allows a single load of a class/classloader pair.
|
|
697 // No performance benefit and no deadlock issues.
|
|
698 // case 5. Future: parallel user level classloaders - without objectLocker
|
|
699 symbolHandle nullsymbolHandle;
|
|
700 bool throw_circularity_error = false;
|
|
701 {
|
|
702 MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
703 if (!UnsyncloadClass) {
|
|
704 PlaceholderEntry* oldprobe = placeholders()->get_entry(p_index, p_hash, name, class_loader);
|
|
705 if (oldprobe) {
|
|
706 // only need check_seen_thread once, not on each loop
|
|
707 // 6341374 java/lang/Instrument with -Xcomp
|
|
708 if (oldprobe->check_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE)) {
|
|
709 throw_circularity_error = true;
|
|
710 } else {
|
|
711 // case 1: traditional: should never see load_in_progress.
|
|
712 while (!class_has_been_loaded && oldprobe && oldprobe->instance_load_in_progress()) {
|
|
713
|
|
714 // case 4: bootstrap classloader: prevent futile classloading,
|
|
715 // wait on first requestor
|
|
716 if (class_loader.is_null()) {
|
|
717 SystemDictionary_lock->wait();
|
|
718 } else {
|
|
719 // case 2: traditional with broken classloader lock. wait on first
|
|
720 // requestor.
|
|
721 double_lock_wait(lockObject, THREAD);
|
|
722 }
|
|
723 // Check if classloading completed while we were waiting
|
|
724 klassOop check = find_class(d_index, d_hash, name, class_loader);
|
|
725 if (check != NULL) {
|
|
726 // Klass is already loaded, so just return it
|
|
727 k = instanceKlassHandle(THREAD, check);
|
|
728 class_has_been_loaded = true;
|
|
729 }
|
|
730 // check if other thread failed to load and cleaned up
|
|
731 oldprobe = placeholders()->get_entry(p_index, p_hash, name, class_loader);
|
|
732 }
|
|
733 }
|
|
734 }
|
|
735 }
|
|
736 // All cases: add LOAD_INSTANCE
|
|
737 // case 3: UnsyncloadClass: allow competing threads to try
|
|
738 // LOAD_INSTANCE in parallel
|
|
739 // add placeholder entry even if error - callers will remove on error
|
|
740 if (!class_has_been_loaded) {
|
|
741 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, name, class_loader, PlaceholderTable::LOAD_INSTANCE, nullsymbolHandle, THREAD);
|
|
742 if (throw_circularity_error) {
|
|
743 newprobe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE);
|
|
744 }
|
|
745 // For class loaders that do not acquire the classloader object lock,
|
|
746 // if they did not catch another thread holding LOAD_INSTANCE,
|
|
747 // need a check analogous to the acquire ObjectLocker/find_class
|
|
748 // i.e. now that we hold the LOAD_INSTANCE token on loading this class/CL
|
|
749 // one final check if the load has already completed
|
|
750 klassOop check = find_class(d_index, d_hash, name, class_loader);
|
|
751 if (check != NULL) {
|
|
752 // Klass is already loaded, so just return it
|
|
753 k = instanceKlassHandle(THREAD, check);
|
|
754 class_has_been_loaded = true;
|
|
755 newprobe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE);
|
|
756 }
|
|
757 }
|
|
758 }
|
|
759 // must throw error outside of owning lock
|
|
760 if (throw_circularity_error) {
|
|
761 ResourceMark rm(THREAD);
|
|
762 THROW_MSG_0(vmSymbols::java_lang_ClassCircularityError(), name->as_C_string());
|
|
763 }
|
|
764
|
|
765 if (!class_has_been_loaded) {
|
|
766
|
|
767 // Do actual loading
|
|
768 k = load_instance_class(name, class_loader, THREAD);
|
|
769
|
|
770 // In custom class loaders, the usual findClass calls
|
|
771 // findLoadedClass, which directly searches the SystemDictionary, then
|
|
772 // defineClass. If these are not atomic with respect to other threads,
|
|
773 // the findLoadedClass can fail, but the defineClass can get a
|
|
774 // LinkageError:: duplicate class definition.
|
|
775 // If they got a linkageError, check if a parallel class load succeeded.
|
|
776 // If it did, then for bytecode resolution the specification requires
|
|
777 // that we return the same result we did for the other thread, i.e. the
|
|
778 // successfully loaded instanceKlass
|
|
779 // Note: Class can not be unloaded as long as any classloader refs exist
|
|
780 // Should not get here for classloaders that support parallelism
|
|
781 // with the new cleaner mechanism, e.g. bootstrap classloader
|
|
782 if (UnsyncloadClass || (class_loader.is_null())) {
|
|
783 if (k.is_null() && HAS_PENDING_EXCEPTION
|
|
784 && PENDING_EXCEPTION->is_a(SystemDictionary::linkageError_klass())) {
|
|
785 MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
786 klassOop check = find_class(d_index, d_hash, name, class_loader);
|
|
787 if (check != NULL) {
|
|
788 // Klass is already loaded, so just use it
|
|
789 k = instanceKlassHandle(THREAD, check);
|
|
790 CLEAR_PENDING_EXCEPTION;
|
|
791 guarantee((!class_loader.is_null()), "dup definition for bootstrap loader?");
|
|
792 }
|
|
793 }
|
|
794 }
|
|
795
|
|
796 // clean up placeholder entries for success or error
|
|
797 // This cleans up LOAD_INSTANCE entries
|
|
798 // It also cleans up LOAD_SUPER entries on errors from
|
|
799 // calling load_instance_class
|
|
800 {
|
|
801 MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
802 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name, class_loader);
|
|
803 if (probe != NULL) {
|
|
804 probe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE);
|
|
805 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD);
|
|
806 SystemDictionary_lock->notify_all();
|
|
807 }
|
|
808 }
|
|
809
|
|
810 // If everything was OK (no exceptions, no null return value), and
|
|
811 // class_loader is NOT the defining loader, do a little more bookkeeping.
|
|
812 if (!HAS_PENDING_EXCEPTION && !k.is_null() &&
|
|
813 k->class_loader() != class_loader()) {
|
|
814
|
|
815 check_constraints(d_index, d_hash, k, class_loader, false, THREAD);
|
|
816
|
|
817 // Need to check for a PENDING_EXCEPTION again; check_constraints
|
|
818 // can throw and doesn't use the CHECK macro.
|
|
819 if (!HAS_PENDING_EXCEPTION) {
|
|
820 { // Grabbing the Compile_lock prevents systemDictionary updates
|
|
821 // during compilations.
|
|
822 MutexLocker mu(Compile_lock, THREAD);
|
|
823 update_dictionary(d_index, d_hash, p_index, p_hash,
|
|
824 k, class_loader, THREAD);
|
|
825 }
|
|
826 if (JvmtiExport::should_post_class_load()) {
|
|
827 Thread *thread = THREAD;
|
|
828 assert(thread->is_Java_thread(), "thread->is_Java_thread()");
|
|
829 JvmtiExport::post_class_load((JavaThread *) thread, k());
|
|
830 }
|
|
831 }
|
|
832 }
|
|
833 if (HAS_PENDING_EXCEPTION || k.is_null()) {
|
|
834 // On error, clean up placeholders
|
|
835 {
|
|
836 MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
837 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD);
|
|
838 SystemDictionary_lock->notify_all();
|
|
839 }
|
|
840 return NULL;
|
|
841 }
|
|
842 }
|
|
843 }
|
|
844
|
|
845 #ifdef ASSERT
|
|
846 {
|
|
847 Handle loader (THREAD, k->class_loader());
|
|
848 MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
849 oop kk = find_class_or_placeholder(name, loader);
|
|
850 assert(kk == k(), "should be present in dictionary");
|
|
851 }
|
|
852 #endif
|
|
853
|
|
854 // return if the protection domain in NULL
|
|
855 if (protection_domain() == NULL) return k();
|
|
856
|
|
857 // Check the protection domain has the right access
|
|
858 {
|
|
859 MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
860 // Note that we have an entry, and entries can be deleted only during GC,
|
|
861 // so we cannot allow GC to occur while we're holding this entry.
|
|
862 // We're using a No_Safepoint_Verifier to catch any place where we
|
|
863 // might potentially do a GC at all.
|
|
864 // SystemDictionary::do_unloading() asserts that classes are only
|
|
865 // unloaded at a safepoint.
|
|
866 No_Safepoint_Verifier nosafepoint;
|
|
867 if (dictionary()->is_valid_protection_domain(d_index, d_hash, name,
|
|
868 class_loader,
|
|
869 protection_domain)) {
|
|
870 return k();
|
|
871 }
|
|
872 }
|
|
873
|
|
874 // Verify protection domain. If it fails an exception is thrown
|
|
875 validate_protection_domain(k, class_loader, protection_domain, CHECK_(klassOop(NULL)));
|
|
876
|
|
877 return k();
|
|
878 }
|
|
879
|
|
880
|
|
881 // This routine does not lock the system dictionary.
|
|
882 //
|
|
883 // Since readers don't hold a lock, we must make sure that system
|
|
884 // dictionary entries are only removed at a safepoint (when only one
|
|
885 // thread is running), and are added to in a safe way (all links must
|
|
886 // be updated in an MT-safe manner).
|
|
887 //
|
|
888 // Callers should be aware that an entry could be added just after
|
|
889 // _dictionary->bucket(index) is read here, so the caller will not see
|
|
890 // the new entry.
|
|
891
|
|
892 klassOop SystemDictionary::find(symbolHandle class_name,
|
|
893 Handle class_loader,
|
|
894 Handle protection_domain,
|
|
895 TRAPS) {
|
|
896
|
|
897 unsigned int d_hash = dictionary()->compute_hash(class_name, class_loader);
|
|
898 int d_index = dictionary()->hash_to_index(d_hash);
|
|
899
|
|
900 {
|
|
901 // Note that we have an entry, and entries can be deleted only during GC,
|
|
902 // so we cannot allow GC to occur while we're holding this entry.
|
|
903 // We're using a No_Safepoint_Verifier to catch any place where we
|
|
904 // might potentially do a GC at all.
|
|
905 // SystemDictionary::do_unloading() asserts that classes are only
|
|
906 // unloaded at a safepoint.
|
|
907 No_Safepoint_Verifier nosafepoint;
|
|
908 return dictionary()->find(d_index, d_hash, class_name, class_loader,
|
|
909 protection_domain, THREAD);
|
|
910 }
|
|
911 }
|
|
912
|
|
913
|
|
914 // Look for a loaded instance or array klass by name. Do not do any loading.
|
|
915 // return NULL in case of error.
|
|
916 klassOop SystemDictionary::find_instance_or_array_klass(symbolHandle class_name,
|
|
917 Handle class_loader,
|
|
918 Handle protection_domain,
|
|
919 TRAPS) {
|
|
920 klassOop k = NULL;
|
|
921 assert(class_name() != NULL, "class name must be non NULL");
|
|
922 if (FieldType::is_array(class_name())) {
|
|
923 // The name refers to an array. Parse the name.
|
|
924 jint dimension;
|
|
925 symbolOop object_key;
|
|
926
|
|
927 // dimension and object_key are assigned as a side-effect of this call
|
|
928 BasicType t = FieldType::get_array_info(class_name(), &dimension,
|
|
929 &object_key, CHECK_(NULL));
|
|
930 if (t != T_OBJECT) {
|
|
931 k = Universe::typeArrayKlassObj(t);
|
|
932 } else {
|
|
933 symbolHandle h_key(THREAD, object_key);
|
|
934 k = SystemDictionary::find(h_key, class_loader, protection_domain, THREAD);
|
|
935 }
|
|
936 if (k != NULL) {
|
|
937 k = Klass::cast(k)->array_klass_or_null(dimension);
|
|
938 }
|
|
939 } else {
|
|
940 k = find(class_name, class_loader, protection_domain, THREAD);
|
|
941 }
|
|
942 return k;
|
|
943 }
|
|
944
|
|
945 // Note: this method is much like resolve_from_stream, but
|
|
946 // updates no supplemental data structures.
|
|
947 // TODO consolidate the two methods with a helper routine?
|
|
948 klassOop SystemDictionary::parse_stream(symbolHandle class_name,
|
|
949 Handle class_loader,
|
|
950 Handle protection_domain,
|
|
951 ClassFileStream* st,
|
|
952 TRAPS) {
|
|
953 symbolHandle parsed_name;
|
|
954
|
|
955 // Parse the stream. Note that we do this even though this klass might
|
|
956 // already be present in the SystemDictionary, otherwise we would not
|
|
957 // throw potential ClassFormatErrors.
|
|
958 //
|
|
959 // Note: "name" is updated.
|
|
960 // Further note: a placeholder will be added for this class when
|
|
961 // super classes are loaded (resolve_super_or_fail). We expect this
|
|
962 // to be called for all classes but java.lang.Object; and we preload
|
|
963 // java.lang.Object through resolve_or_fail, not this path.
|
|
964
|
|
965 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name,
|
|
966 class_loader,
|
|
967 protection_domain,
|
|
968 parsed_name,
|
|
969 THREAD);
|
|
970
|
|
971
|
|
972 // We don't redefine the class, so we just need to clean up whether there
|
|
973 // was an error or not (don't want to modify any system dictionary
|
|
974 // data structures).
|
|
975 // Parsed name could be null if we threw an error before we got far
|
|
976 // enough along to parse it -- in that case, there is nothing to clean up.
|
|
977 if (!parsed_name.is_null()) {
|
|
978 unsigned int p_hash = placeholders()->compute_hash(parsed_name,
|
|
979 class_loader);
|
|
980 int p_index = placeholders()->hash_to_index(p_hash);
|
|
981 {
|
|
982 MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
983 placeholders()->find_and_remove(p_index, p_hash, parsed_name, class_loader, THREAD);
|
|
984 SystemDictionary_lock->notify_all();
|
|
985 }
|
|
986 }
|
|
987
|
|
988 return k();
|
|
989 }
|
|
990
|
|
991 // Add a klass to the system from a stream (called by jni_DefineClass and
|
|
992 // JVM_DefineClass).
|
|
993 // Note: class_name can be NULL. In that case we do not know the name of
|
|
994 // the class until we have parsed the stream.
|
|
995
|
|
996 klassOop SystemDictionary::resolve_from_stream(symbolHandle class_name,
|
|
997 Handle class_loader,
|
|
998 Handle protection_domain,
|
|
999 ClassFileStream* st,
|
|
1000 TRAPS) {
|
|
1001
|
|
1002 // Make sure we are synchronized on the class loader before we initiate
|
|
1003 // loading.
|
|
1004 Handle lockObject = compute_loader_lock_object(class_loader, THREAD);
|
|
1005 check_loader_lock_contention(lockObject, THREAD);
|
|
1006 ObjectLocker ol(lockObject, THREAD);
|
|
1007
|
|
1008 symbolHandle parsed_name;
|
|
1009
|
|
1010 // Parse the stream. Note that we do this even though this klass might
|
|
1011 // already be present in the SystemDictionary, otherwise we would not
|
|
1012 // throw potential ClassFormatErrors.
|
|
1013 //
|
|
1014 // Note: "name" is updated.
|
|
1015 // Further note: a placeholder will be added for this class when
|
|
1016 // super classes are loaded (resolve_super_or_fail). We expect this
|
|
1017 // to be called for all classes but java.lang.Object; and we preload
|
|
1018 // java.lang.Object through resolve_or_fail, not this path.
|
|
1019
|
|
1020 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name,
|
|
1021 class_loader,
|
|
1022 protection_domain,
|
|
1023 parsed_name,
|
|
1024 THREAD);
|
|
1025
|
|
1026 const char* pkg = "java/";
|
|
1027 if (!HAS_PENDING_EXCEPTION &&
|
|
1028 !class_loader.is_null() &&
|
|
1029 !parsed_name.is_null() &&
|
|
1030 !strncmp((const char*)parsed_name->bytes(), pkg, strlen(pkg))) {
|
|
1031 // It is illegal to define classes in the "java." package from
|
|
1032 // JVM_DefineClass or jni_DefineClass unless you're the bootclassloader
|
|
1033 ResourceMark rm(THREAD);
|
|
1034 char* name = parsed_name->as_C_string();
|
|
1035 char* index = strrchr(name, '/');
|
|
1036 *index = '\0'; // chop to just the package name
|
|
1037 while ((index = strchr(name, '/')) != NULL) {
|
|
1038 *index = '.'; // replace '/' with '.' in package name
|
|
1039 }
|
|
1040 const char* fmt = "Prohibited package name: %s";
|
|
1041 size_t len = strlen(fmt) + strlen(name);
|
|
1042 char* message = NEW_RESOURCE_ARRAY(char, len);
|
|
1043 jio_snprintf(message, len, fmt, name);
|
|
1044 Exceptions::_throw_msg(THREAD_AND_LOCATION,
|
|
1045 vmSymbols::java_lang_SecurityException(), message);
|
|
1046 }
|
|
1047
|
|
1048 if (!HAS_PENDING_EXCEPTION) {
|
|
1049 assert(!parsed_name.is_null(), "Sanity");
|
|
1050 assert(class_name.is_null() || class_name() == parsed_name(),
|
|
1051 "name mismatch");
|
|
1052 // Verification prevents us from creating names with dots in them, this
|
|
1053 // asserts that that's the case.
|
|
1054 assert(is_internal_format(parsed_name),
|
|
1055 "external class name format used internally");
|
|
1056
|
|
1057 // Add class just loaded
|
|
1058 define_instance_class(k, THREAD);
|
|
1059 }
|
|
1060
|
|
1061 // If parsing the class file or define_instance_class failed, we
|
|
1062 // need to remove the placeholder added on our behalf. But we
|
|
1063 // must make sure parsed_name is valid first (it won't be if we had
|
|
1064 // a format error before the class was parsed far enough to
|
|
1065 // find the name).
|
|
1066 if (HAS_PENDING_EXCEPTION && !parsed_name.is_null()) {
|
|
1067 unsigned int p_hash = placeholders()->compute_hash(parsed_name,
|
|
1068 class_loader);
|
|
1069 int p_index = placeholders()->hash_to_index(p_hash);
|
|
1070 {
|
|
1071 MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
1072 placeholders()->find_and_remove(p_index, p_hash, parsed_name, class_loader, THREAD);
|
|
1073 SystemDictionary_lock->notify_all();
|
|
1074 }
|
|
1075 return NULL;
|
|
1076 }
|
|
1077
|
|
1078 // Make sure that we didn't leave a place holder in the
|
|
1079 // SystemDictionary; this is only done on success
|
|
1080 debug_only( {
|
|
1081 if (!HAS_PENDING_EXCEPTION) {
|
|
1082 assert(!parsed_name.is_null(), "parsed_name is still null?");
|
|
1083 symbolHandle h_name (THREAD, k->name());
|
|
1084 Handle h_loader (THREAD, k->class_loader());
|
|
1085
|
|
1086 MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
1087
|
|
1088 oop check = find_class_or_placeholder(parsed_name, class_loader);
|
|
1089 assert(check == k(), "should be present in the dictionary");
|
|
1090
|
|
1091 oop check2 = find_class_or_placeholder(h_name, h_loader);
|
|
1092 assert(check == check2, "name inconsistancy in SystemDictionary");
|
|
1093 }
|
|
1094 } );
|
|
1095
|
|
1096 return k();
|
|
1097 }
|
|
1098
|
|
1099
|
|
1100 void SystemDictionary::set_shared_dictionary(HashtableBucket* t, int length,
|
|
1101 int number_of_entries) {
|
|
1102 assert(length == _nof_buckets * sizeof(HashtableBucket),
|
|
1103 "bad shared dictionary size.");
|
|
1104 _shared_dictionary = new Dictionary(_nof_buckets, t, number_of_entries);
|
|
1105 }
|
|
1106
|
|
1107
|
|
1108 // If there is a shared dictionary, then find the entry for the
|
|
1109 // given shared system class, if any.
|
|
1110
|
|
1111 klassOop SystemDictionary::find_shared_class(symbolHandle class_name) {
|
|
1112 if (shared_dictionary() != NULL) {
|
|
1113 unsigned int d_hash = dictionary()->compute_hash(class_name, Handle());
|
|
1114 int d_index = dictionary()->hash_to_index(d_hash);
|
|
1115 return shared_dictionary()->find_shared_class(d_index, d_hash, class_name);
|
|
1116 } else {
|
|
1117 return NULL;
|
|
1118 }
|
|
1119 }
|
|
1120
|
|
1121
|
|
1122 // Load a class from the shared spaces (found through the shared system
|
|
1123 // dictionary). Force the superclass and all interfaces to be loaded.
|
|
1124 // Update the class definition to include sibling classes and no
|
|
1125 // subclasses (yet). [Classes in the shared space are not part of the
|
|
1126 // object hierarchy until loaded.]
|
|
1127
|
|
1128 instanceKlassHandle SystemDictionary::load_shared_class(
|
|
1129 symbolHandle class_name, Handle class_loader, TRAPS) {
|
|
1130 instanceKlassHandle ik (THREAD, find_shared_class(class_name));
|
|
1131 return load_shared_class(ik, class_loader, THREAD);
|
|
1132 }
|
|
1133
|
|
1134 // Note well! Changes to this method may affect oop access order
|
|
1135 // in the shared archive. Please take care to not make changes that
|
|
1136 // adversely affect cold start time by changing the oop access order
|
|
1137 // that is specified in dump.cpp MarkAndMoveOrderedReadOnly and
|
|
1138 // MarkAndMoveOrderedReadWrite closures.
|
|
1139 instanceKlassHandle SystemDictionary::load_shared_class(
|
|
1140 instanceKlassHandle ik, Handle class_loader, TRAPS) {
|
|
1141 assert(class_loader.is_null(), "non-null classloader for shared class?");
|
|
1142 if (ik.not_null()) {
|
|
1143 instanceKlassHandle nh = instanceKlassHandle(); // null Handle
|
|
1144 symbolHandle class_name(THREAD, ik->name());
|
|
1145
|
|
1146 // Found the class, now load the superclass and interfaces. If they
|
|
1147 // are shared, add them to the main system dictionary and reset
|
|
1148 // their hierarchy references (supers, subs, and interfaces).
|
|
1149
|
|
1150 if (ik->super() != NULL) {
|
|
1151 symbolHandle cn(THREAD, ik->super()->klass_part()->name());
|
|
1152 resolve_super_or_fail(class_name, cn,
|
|
1153 class_loader, Handle(), true, CHECK_(nh));
|
|
1154 }
|
|
1155
|
|
1156 objArrayHandle interfaces (THREAD, ik->local_interfaces());
|
|
1157 int num_interfaces = interfaces->length();
|
|
1158 for (int index = 0; index < num_interfaces; index++) {
|
|
1159 klassOop k = klassOop(interfaces->obj_at(index));
|
|
1160
|
|
1161 // Note: can not use instanceKlass::cast here because
|
|
1162 // interfaces' instanceKlass's C++ vtbls haven't been
|
|
1163 // reinitialized yet (they will be once the interface classes
|
|
1164 // are loaded)
|
|
1165 symbolHandle name (THREAD, k->klass_part()->name());
|
|
1166 resolve_super_or_fail(class_name, name, class_loader, Handle(), false, CHECK_(nh));
|
|
1167 }
|
|
1168
|
|
1169 // Adjust methods to recover missing data. They need addresses for
|
|
1170 // interpreter entry points and their default native method address
|
|
1171 // must be reset.
|
|
1172
|
|
1173 // Updating methods must be done under a lock so multiple
|
|
1174 // threads don't update these in parallel
|
|
1175 // Shared classes are all currently loaded by the bootstrap
|
|
1176 // classloader, so this will never cause a deadlock on
|
|
1177 // a custom class loader lock.
|
|
1178
|
|
1179 {
|
|
1180 Handle lockObject = compute_loader_lock_object(class_loader, THREAD);
|
|
1181 check_loader_lock_contention(lockObject, THREAD);
|
|
1182 ObjectLocker ol(lockObject, THREAD, true);
|
|
1183
|
|
1184 objArrayHandle methods (THREAD, ik->methods());
|
|
1185 int num_methods = methods->length();
|
|
1186 for (int index2 = 0; index2 < num_methods; ++index2) {
|
|
1187 methodHandle m(THREAD, methodOop(methods->obj_at(index2)));
|
|
1188 m()->link_method(m, CHECK_(nh));
|
|
1189 }
|
|
1190 }
|
|
1191
|
|
1192 if (TraceClassLoading) {
|
|
1193 ResourceMark rm;
|
|
1194 tty->print("[Loaded %s", ik->external_name());
|
|
1195 tty->print(" from shared objects file");
|
|
1196 tty->print_cr("]");
|
|
1197 }
|
|
1198 // notify a class loaded from shared object
|
|
1199 ClassLoadingService::notify_class_loaded(instanceKlass::cast(ik()),
|
|
1200 true /* shared class */);
|
|
1201 }
|
|
1202 return ik;
|
|
1203 }
|
|
1204
|
|
1205 #ifdef KERNEL
|
|
1206 // Some classes on the bootstrap class path haven't been installed on the
|
|
1207 // system yet. Call the DownloadManager method to make them appear in the
|
|
1208 // bootstrap class path and try again to load the named class.
|
|
1209 // Note that with delegation class loaders all classes in another loader will
|
|
1210 // first try to call this so it'd better be fast!!
|
|
1211 static instanceKlassHandle download_and_retry_class_load(
|
|
1212 symbolHandle class_name,
|
|
1213 TRAPS) {
|
|
1214
|
|
1215 klassOop dlm = SystemDictionary::sun_jkernel_DownloadManager_klass();
|
|
1216 instanceKlassHandle nk;
|
|
1217
|
|
1218 // If download manager class isn't loaded just return.
|
|
1219 if (dlm == NULL) return nk;
|
|
1220
|
|
1221 { HandleMark hm(THREAD);
|
|
1222 ResourceMark rm(THREAD);
|
|
1223 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nk));
|
|
1224 Handle class_string = java_lang_String::externalize_classname(s, CHECK_(nk));
|
|
1225
|
|
1226 // return value
|
|
1227 JavaValue result(T_OBJECT);
|
|
1228
|
|
1229 // Call the DownloadManager. We assume that it has a lock because
|
|
1230 // multiple classes could be not found and downloaded at the same time.
|
|
1231 // class sun.misc.DownloadManager;
|
|
1232 // public static String getBootClassPathEntryForClass(String className);
|
|
1233 JavaCalls::call_static(&result,
|
|
1234 KlassHandle(THREAD, dlm),
|
|
1235 vmSymbolHandles::getBootClassPathEntryForClass_name(),
|
|
1236 vmSymbolHandles::string_string_signature(),
|
|
1237 class_string,
|
|
1238 CHECK_(nk));
|
|
1239
|
|
1240 // Get result.string and add to bootclasspath
|
|
1241 assert(result.get_type() == T_OBJECT, "just checking");
|
|
1242 oop obj = (oop) result.get_jobject();
|
|
1243 if (obj == NULL) { return nk; }
|
|
1244
|
|
1245 char* new_class_name = java_lang_String::as_utf8_string(obj);
|
|
1246
|
|
1247 // lock the loader
|
|
1248 // we use this lock because JVMTI does.
|
|
1249 Handle loader_lock(THREAD, SystemDictionary::system_loader_lock());
|
|
1250
|
|
1251 ObjectLocker ol(loader_lock, THREAD);
|
|
1252 // add the file to the bootclasspath
|
|
1253 ClassLoader::update_class_path_entry_list(new_class_name, true);
|
|
1254 } // end HandleMark
|
|
1255
|
|
1256 if (TraceClassLoading) {
|
|
1257 ClassLoader::print_bootclasspath();
|
|
1258 }
|
|
1259 return ClassLoader::load_classfile(class_name, CHECK_(nk));
|
|
1260 }
|
|
1261 #endif // KERNEL
|
|
1262
|
|
1263
|
|
1264 instanceKlassHandle SystemDictionary::load_instance_class(symbolHandle class_name, Handle class_loader, TRAPS) {
|
|
1265 instanceKlassHandle nh = instanceKlassHandle(); // null Handle
|
|
1266 if (class_loader.is_null()) {
|
|
1267 // Search the shared system dictionary for classes preloaded into the
|
|
1268 // shared spaces.
|
|
1269 instanceKlassHandle k;
|
|
1270 k = load_shared_class(class_name, class_loader, THREAD);
|
|
1271
|
|
1272 if (k.is_null()) {
|
|
1273 // Use VM class loader
|
|
1274 k = ClassLoader::load_classfile(class_name, CHECK_(nh));
|
|
1275 }
|
|
1276
|
|
1277 #ifdef KERNEL
|
|
1278 // If the VM class loader has failed to load the class, call the
|
|
1279 // DownloadManager class to make it magically appear on the classpath
|
|
1280 // and try again. This is only configured with the Kernel VM.
|
|
1281 if (k.is_null()) {
|
|
1282 k = download_and_retry_class_load(class_name, CHECK_(nh));
|
|
1283 }
|
|
1284 #endif // KERNEL
|
|
1285
|
|
1286 // find_or_define_instance_class may return a different k
|
|
1287 if (!k.is_null()) {
|
|
1288 k = find_or_define_instance_class(class_name, class_loader, k, CHECK_(nh));
|
|
1289 }
|
|
1290 return k;
|
|
1291 } else {
|
|
1292 // Use user specified class loader to load class. Call loadClass operation on class_loader.
|
|
1293 ResourceMark rm(THREAD);
|
|
1294
|
|
1295 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nh));
|
|
1296 // Translate to external class name format, i.e., convert '/' chars to '.'
|
|
1297 Handle string = java_lang_String::externalize_classname(s, CHECK_(nh));
|
|
1298
|
|
1299 JavaValue result(T_OBJECT);
|
|
1300
|
|
1301 KlassHandle spec_klass (THREAD, SystemDictionary::classloader_klass());
|
|
1302
|
|
1303 // UnsyncloadClass option means don't synchronize loadClass() calls.
|
|
1304 // loadClassInternal() is synchronized and public loadClass(String) is not.
|
|
1305 // This flag is for diagnostic purposes only. It is risky to call
|
|
1306 // custom class loaders without synchronization.
|
|
1307 // WARNING If a custom class loader does NOT synchronizer findClass, or callers of
|
|
1308 // findClass, this flag risks unexpected timing bugs in the field.
|
|
1309 // Do NOT assume this will be supported in future releases.
|
|
1310 if (!UnsyncloadClass && has_loadClassInternal()) {
|
|
1311 JavaCalls::call_special(&result,
|
|
1312 class_loader,
|
|
1313 spec_klass,
|
|
1314 vmSymbolHandles::loadClassInternal_name(),
|
|
1315 vmSymbolHandles::string_class_signature(),
|
|
1316 string,
|
|
1317 CHECK_(nh));
|
|
1318 } else {
|
|
1319 JavaCalls::call_virtual(&result,
|
|
1320 class_loader,
|
|
1321 spec_klass,
|
|
1322 vmSymbolHandles::loadClass_name(),
|
|
1323 vmSymbolHandles::string_class_signature(),
|
|
1324 string,
|
|
1325 CHECK_(nh));
|
|
1326 }
|
|
1327
|
|
1328 assert(result.get_type() == T_OBJECT, "just checking");
|
|
1329 oop obj = (oop) result.get_jobject();
|
|
1330
|
|
1331 // Primitive classes return null since forName() can not be
|
|
1332 // used to obtain any of the Class objects representing primitives or void
|
|
1333 if ((obj != NULL) && !(java_lang_Class::is_primitive(obj))) {
|
|
1334 instanceKlassHandle k =
|
|
1335 instanceKlassHandle(THREAD, java_lang_Class::as_klassOop(obj));
|
|
1336 // For user defined Java class loaders, check that the name returned is
|
|
1337 // the same as that requested. This check is done for the bootstrap
|
|
1338 // loader when parsing the class file.
|
|
1339 if (class_name() == k->name()) {
|
|
1340 return k;
|
|
1341 }
|
|
1342 }
|
|
1343 // Class is not found or has the wrong name, return NULL
|
|
1344 return nh;
|
|
1345 }
|
|
1346 }
|
|
1347
|
|
1348 void SystemDictionary::define_instance_class(instanceKlassHandle k, TRAPS) {
|
|
1349
|
|
1350 Handle class_loader_h(THREAD, k->class_loader());
|
|
1351
|
|
1352 // for bootstrap classloader don't acquire lock
|
|
1353 if (!class_loader_h.is_null()) {
|
|
1354 assert(ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD,
|
|
1355 compute_loader_lock_object(class_loader_h, THREAD)),
|
|
1356 "define called without lock");
|
|
1357 }
|
|
1358
|
|
1359
|
|
1360 // Check class-loading constraints. Throw exception if violation is detected.
|
|
1361 // Grabs and releases SystemDictionary_lock
|
|
1362 // The check_constraints/find_class call and update_dictionary sequence
|
|
1363 // must be "atomic" for a specific class/classloader pair so we never
|
|
1364 // define two different instanceKlasses for that class/classloader pair.
|
|
1365 // Existing classloaders will call define_instance_class with the
|
|
1366 // classloader lock held
|
|
1367 // Parallel classloaders will call find_or_define_instance_class
|
|
1368 // which will require a token to perform the define class
|
|
1369 symbolHandle name_h(THREAD, k->name());
|
|
1370 unsigned int d_hash = dictionary()->compute_hash(name_h, class_loader_h);
|
|
1371 int d_index = dictionary()->hash_to_index(d_hash);
|
|
1372 check_constraints(d_index, d_hash, k, class_loader_h, true, CHECK);
|
|
1373
|
|
1374 // Register class just loaded with class loader (placed in Vector)
|
|
1375 // Note we do this before updating the dictionary, as this can
|
|
1376 // fail with an OutOfMemoryError (if it does, we will *not* put this
|
|
1377 // class in the dictionary and will not update the class hierarchy).
|
|
1378 if (k->class_loader() != NULL) {
|
|
1379 methodHandle m(THREAD, Universe::loader_addClass_method());
|
|
1380 JavaValue result(T_VOID);
|
|
1381 JavaCallArguments args(class_loader_h);
|
|
1382 args.push_oop(Handle(THREAD, k->java_mirror()));
|
|
1383 JavaCalls::call(&result, m, &args, CHECK);
|
|
1384 }
|
|
1385
|
|
1386 // Add the new class. We need recompile lock during update of CHA.
|
|
1387 {
|
|
1388 unsigned int p_hash = placeholders()->compute_hash(name_h, class_loader_h);
|
|
1389 int p_index = placeholders()->hash_to_index(p_hash);
|
|
1390
|
|
1391 MutexLocker mu_r(Compile_lock, THREAD);
|
|
1392
|
|
1393 // Add to class hierarchy, initialize vtables, and do possible
|
|
1394 // deoptimizations.
|
|
1395 add_to_hierarchy(k, CHECK); // No exception, but can block
|
|
1396
|
|
1397 // Add to systemDictionary - so other classes can see it.
|
|
1398 // Grabs and releases SystemDictionary_lock
|
|
1399 update_dictionary(d_index, d_hash, p_index, p_hash,
|
|
1400 k, class_loader_h, THREAD);
|
|
1401 }
|
|
1402 k->eager_initialize(THREAD);
|
|
1403
|
|
1404 // notify jvmti
|
|
1405 if (JvmtiExport::should_post_class_load()) {
|
|
1406 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()");
|
|
1407 JvmtiExport::post_class_load((JavaThread *) THREAD, k());
|
|
1408
|
|
1409 }
|
|
1410 }
|
|
1411
|
|
1412 // Support parallel classloading
|
|
1413 // Initial implementation for bootstrap classloader
|
|
1414 // For future:
|
|
1415 // For custom class loaders that support parallel classloading,
|
|
1416 // in case they do not synchronize around
|
|
1417 // FindLoadedClass/DefineClass calls, we check for parallel
|
|
1418 // loading for them, wait if a defineClass is in progress
|
|
1419 // and return the initial requestor's results
|
|
1420 // For better performance, the class loaders should synchronize
|
|
1421 // findClass(), i.e. FindLoadedClass/DefineClass or they
|
|
1422 // potentially waste time reading and parsing the bytestream.
|
|
1423 // Note: VM callers should ensure consistency of k/class_name,class_loader
|
|
1424 instanceKlassHandle SystemDictionary::find_or_define_instance_class(symbolHandle class_name, Handle class_loader, instanceKlassHandle k, TRAPS) {
|
|
1425
|
|
1426 instanceKlassHandle nh = instanceKlassHandle(); // null Handle
|
|
1427
|
|
1428 unsigned int d_hash = dictionary()->compute_hash(class_name, class_loader);
|
|
1429 int d_index = dictionary()->hash_to_index(d_hash);
|
|
1430
|
|
1431 // Hold SD lock around find_class and placeholder creation for DEFINE_CLASS
|
|
1432 unsigned int p_hash = placeholders()->compute_hash(class_name, class_loader);
|
|
1433 int p_index = placeholders()->hash_to_index(p_hash);
|
|
1434 PlaceholderEntry* probe;
|
|
1435
|
|
1436 {
|
|
1437 MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
1438 // First check if class already defined
|
|
1439 klassOop check = find_class(d_index, d_hash, class_name, class_loader);
|
|
1440 if (check != NULL) {
|
|
1441 return(instanceKlassHandle(THREAD, check));
|
|
1442 }
|
|
1443
|
|
1444 // Acquire define token for this class/classloader
|
|
1445 symbolHandle nullsymbolHandle;
|
|
1446 probe = placeholders()->find_and_add(p_index, p_hash, class_name, class_loader, PlaceholderTable::DEFINE_CLASS, nullsymbolHandle, THREAD);
|
|
1447 // Check if another thread defining in parallel
|
|
1448 if (probe->definer() == NULL) {
|
|
1449 // Thread will define the class
|
|
1450 probe->set_definer(THREAD);
|
|
1451 } else {
|
|
1452 // Wait for defining thread to finish and return results
|
|
1453 while (probe->definer() != NULL) {
|
|
1454 SystemDictionary_lock->wait();
|
|
1455 }
|
|
1456 if (probe->instanceKlass() != NULL) {
|
|
1457 probe->remove_seen_thread(THREAD, PlaceholderTable::DEFINE_CLASS);
|
|
1458 return(instanceKlassHandle(THREAD, probe->instanceKlass()));
|
|
1459 } else {
|
|
1460 // If definer had an error, try again as any new thread would
|
|
1461 probe->set_definer(THREAD);
|
|
1462 #ifdef ASSERT
|
|
1463 klassOop check = find_class(d_index, d_hash, class_name, class_loader);
|
|
1464 assert(check == NULL, "definer missed recording success");
|
|
1465 #endif
|
|
1466 }
|
|
1467 }
|
|
1468 }
|
|
1469
|
|
1470 define_instance_class(k, THREAD);
|
|
1471
|
|
1472 Handle linkage_exception = Handle(); // null handle
|
|
1473
|
|
1474 // definer must notify any waiting threads
|
|
1475 {
|
|
1476 MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
1477 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, class_name, class_loader);
|
|
1478 assert(probe != NULL, "DEFINE_CLASS placeholder lost?");
|
|
1479 if (probe != NULL) {
|
|
1480 if (HAS_PENDING_EXCEPTION) {
|
|
1481 linkage_exception = Handle(THREAD,PENDING_EXCEPTION);
|
|
1482 CLEAR_PENDING_EXCEPTION;
|
|
1483 } else {
|
|
1484 probe->set_instanceKlass(k());
|
|
1485 }
|
|
1486 probe->set_definer(NULL);
|
|
1487 probe->remove_seen_thread(THREAD, PlaceholderTable::DEFINE_CLASS);
|
|
1488 SystemDictionary_lock->notify_all();
|
|
1489 }
|
|
1490 }
|
|
1491
|
|
1492 // Can't throw exception while holding lock due to rank ordering
|
|
1493 if (linkage_exception() != NULL) {
|
|
1494 THROW_OOP_(linkage_exception(), nh); // throws exception and returns
|
|
1495 }
|
|
1496
|
|
1497 return k;
|
|
1498 }
|
|
1499
|
|
1500 Handle SystemDictionary::compute_loader_lock_object(Handle class_loader, TRAPS) {
|
|
1501 // If class_loader is NULL we synchronize on _system_loader_lock_obj
|
|
1502 if (class_loader.is_null()) {
|
|
1503 return Handle(THREAD, _system_loader_lock_obj);
|
|
1504 } else {
|
|
1505 return class_loader;
|
|
1506 }
|
|
1507 }
|
|
1508
|
|
1509 // This method is added to check how often we have to wait to grab loader
|
|
1510 // lock. The results are being recorded in the performance counters defined in
|
|
1511 // ClassLoader::_sync_systemLoaderLockContentionRate and
|
|
1512 // ClassLoader::_sync_nonSystemLoaderLockConteionRate.
|
|
1513 void SystemDictionary::check_loader_lock_contention(Handle loader_lock, TRAPS) {
|
|
1514 if (!UsePerfData) {
|
|
1515 return;
|
|
1516 }
|
|
1517
|
|
1518 assert(!loader_lock.is_null(), "NULL lock object");
|
|
1519
|
|
1520 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader_lock)
|
|
1521 == ObjectSynchronizer::owner_other) {
|
|
1522 // contention will likely happen, so increment the corresponding
|
|
1523 // contention counter.
|
|
1524 if (loader_lock() == _system_loader_lock_obj) {
|
|
1525 ClassLoader::sync_systemLoaderLockContentionRate()->inc();
|
|
1526 } else {
|
|
1527 ClassLoader::sync_nonSystemLoaderLockContentionRate()->inc();
|
|
1528 }
|
|
1529 }
|
|
1530 }
|
|
1531
|
|
1532 // ----------------------------------------------------------------------------
|
|
1533 // Lookup
|
|
1534
|
|
1535 klassOop SystemDictionary::find_class(int index, unsigned int hash,
|
|
1536 symbolHandle class_name,
|
|
1537 Handle class_loader) {
|
|
1538 assert_locked_or_safepoint(SystemDictionary_lock);
|
|
1539 assert (index == dictionary()->index_for(class_name, class_loader),
|
|
1540 "incorrect index?");
|
|
1541
|
|
1542 klassOop k = dictionary()->find_class(index, hash, class_name, class_loader);
|
|
1543 return k;
|
|
1544 }
|
|
1545
|
|
1546
|
|
1547 // Basic find on classes in the midst of being loaded
|
|
1548 symbolOop SystemDictionary::find_placeholder(int index, unsigned int hash,
|
|
1549 symbolHandle class_name,
|
|
1550 Handle class_loader) {
|
|
1551 assert_locked_or_safepoint(SystemDictionary_lock);
|
|
1552
|
|
1553 return placeholders()->find_entry(index, hash, class_name, class_loader);
|
|
1554 }
|
|
1555
|
|
1556
|
|
1557 // Used for assertions and verification only
|
|
1558 oop SystemDictionary::find_class_or_placeholder(symbolHandle class_name,
|
|
1559 Handle class_loader) {
|
|
1560 #ifndef ASSERT
|
|
1561 guarantee(VerifyBeforeGC ||
|
|
1562 VerifyDuringGC ||
|
|
1563 VerifyBeforeExit ||
|
|
1564 VerifyAfterGC, "too expensive");
|
|
1565 #endif
|
|
1566 assert_locked_or_safepoint(SystemDictionary_lock);
|
|
1567 symbolOop class_name_ = class_name();
|
|
1568 oop class_loader_ = class_loader();
|
|
1569
|
|
1570 // First look in the loaded class array
|
|
1571 unsigned int d_hash = dictionary()->compute_hash(class_name, class_loader);
|
|
1572 int d_index = dictionary()->hash_to_index(d_hash);
|
|
1573 oop lookup = find_class(d_index, d_hash, class_name, class_loader);
|
|
1574
|
|
1575 if (lookup == NULL) {
|
|
1576 // Next try the placeholders
|
|
1577 unsigned int p_hash = placeholders()->compute_hash(class_name,class_loader);
|
|
1578 int p_index = placeholders()->hash_to_index(p_hash);
|
|
1579 lookup = find_placeholder(p_index, p_hash, class_name, class_loader);
|
|
1580 }
|
|
1581
|
|
1582 return lookup;
|
|
1583 }
|
|
1584
|
|
1585
|
|
1586 // Get the next class in the diictionary.
|
|
1587 klassOop SystemDictionary::try_get_next_class() {
|
|
1588 return dictionary()->try_get_next_class();
|
|
1589 }
|
|
1590
|
|
1591
|
|
1592 // ----------------------------------------------------------------------------
|
|
1593 // Update hierachy. This is done before the new klass has been added to the SystemDictionary. The Recompile_lock
|
|
1594 // is held, to ensure that the compiler is not using the class hierachy, and that deoptimization will kick in
|
|
1595 // before a new class is used.
|
|
1596
|
|
1597 void SystemDictionary::add_to_hierarchy(instanceKlassHandle k, TRAPS) {
|
|
1598 assert(k.not_null(), "just checking");
|
|
1599 // Link into hierachy. Make sure the vtables are initialized before linking into
|
|
1600 k->append_to_sibling_list(); // add to superklass/sibling list
|
|
1601 k->process_interfaces(THREAD); // handle all "implements" declarations
|
|
1602 k->set_init_state(instanceKlass::loaded);
|
|
1603 // Now flush all code that depended on old class hierarchy.
|
|
1604 // Note: must be done *after* linking k into the hierarchy (was bug 12/9/97)
|
|
1605 // Also, first reinitialize vtable because it may have gotten out of synch
|
|
1606 // while the new class wasn't connected to the class hierarchy.
|
|
1607 Universe::flush_dependents_on(k);
|
|
1608 }
|
|
1609
|
|
1610
|
|
1611 // ----------------------------------------------------------------------------
|
|
1612 // GC support
|
|
1613
|
|
1614 // Following roots during mark-sweep is separated in two phases.
|
|
1615 //
|
|
1616 // The first phase follows preloaded classes and all other system
|
|
1617 // classes, since these will never get unloaded anyway.
|
|
1618 //
|
|
1619 // The second phase removes (unloads) unreachable classes from the
|
|
1620 // system dictionary and follows the remaining classes' contents.
|
|
1621
|
|
1622 void SystemDictionary::always_strong_oops_do(OopClosure* blk) {
|
|
1623 // Follow preloaded classes/mirrors and system loader object
|
|
1624 blk->do_oop(&_java_system_loader);
|
|
1625 preloaded_oops_do(blk);
|
|
1626 always_strong_classes_do(blk);
|
|
1627 }
|
|
1628
|
|
1629
|
|
1630 void SystemDictionary::always_strong_classes_do(OopClosure* blk) {
|
|
1631 // Follow all system classes and temporary placeholders in dictionary
|
|
1632 dictionary()->always_strong_classes_do(blk);
|
|
1633
|
|
1634 // Placeholders. These are *always* strong roots, as they
|
|
1635 // represent classes we're actively loading.
|
|
1636 placeholders_do(blk);
|
|
1637
|
|
1638 // Loader constraints. We must keep the symbolOop used in the name alive.
|
|
1639 constraints()->always_strong_classes_do(blk);
|
|
1640
|
|
1641 // Resolution errors keep the symbolOop for the error alive
|
|
1642 resolution_errors()->always_strong_classes_do(blk);
|
|
1643 }
|
|
1644
|
|
1645
|
|
1646 void SystemDictionary::placeholders_do(OopClosure* blk) {
|
|
1647 placeholders()->oops_do(blk);
|
|
1648 }
|
|
1649
|
|
1650
|
|
1651 bool SystemDictionary::do_unloading(BoolObjectClosure* is_alive) {
|
|
1652 bool result = dictionary()->do_unloading(is_alive);
|
|
1653 constraints()->purge_loader_constraints(is_alive);
|
|
1654 resolution_errors()->purge_resolution_errors(is_alive);
|
|
1655 return result;
|
|
1656 }
|
|
1657
|
|
1658
|
|
1659 // The mirrors are scanned by shared_oops_do() which is
|
|
1660 // not called by oops_do(). In order to process oops in
|
|
1661 // a necessary order, shared_oops_do() is call by
|
|
1662 // Universe::oops_do().
|
|
1663 void SystemDictionary::oops_do(OopClosure* f) {
|
|
1664 // Adjust preloaded classes and system loader object
|
|
1665 f->do_oop(&_java_system_loader);
|
|
1666 preloaded_oops_do(f);
|
|
1667
|
|
1668 lazily_loaded_oops_do(f);
|
|
1669
|
|
1670 // Adjust dictionary
|
|
1671 dictionary()->oops_do(f);
|
|
1672
|
|
1673 // Partially loaded classes
|
|
1674 placeholders()->oops_do(f);
|
|
1675
|
|
1676 // Adjust constraint table
|
|
1677 constraints()->oops_do(f);
|
|
1678
|
|
1679 // Adjust resolution error table
|
|
1680 resolution_errors()->oops_do(f);
|
|
1681 }
|
|
1682
|
|
1683
|
|
1684 void SystemDictionary::preloaded_oops_do(OopClosure* f) {
|
|
1685 f->do_oop((oop*) &_string_klass);
|
|
1686 f->do_oop((oop*) &_object_klass);
|
|
1687 f->do_oop((oop*) &_class_klass);
|
|
1688 f->do_oop((oop*) &_cloneable_klass);
|
|
1689 f->do_oop((oop*) &_classloader_klass);
|
|
1690 f->do_oop((oop*) &_serializable_klass);
|
|
1691 f->do_oop((oop*) &_system_klass);
|
|
1692
|
|
1693 f->do_oop((oop*) &_throwable_klass);
|
|
1694 f->do_oop((oop*) &_error_klass);
|
|
1695 f->do_oop((oop*) &_threaddeath_klass);
|
|
1696 f->do_oop((oop*) &_exception_klass);
|
|
1697 f->do_oop((oop*) &_runtime_exception_klass);
|
|
1698 f->do_oop((oop*) &_classNotFoundException_klass);
|
|
1699 f->do_oop((oop*) &_noClassDefFoundError_klass);
|
|
1700 f->do_oop((oop*) &_linkageError_klass);
|
|
1701 f->do_oop((oop*) &_classCastException_klass);
|
|
1702 f->do_oop((oop*) &_arrayStoreException_klass);
|
|
1703 f->do_oop((oop*) &_virtualMachineError_klass);
|
|
1704 f->do_oop((oop*) &_outOfMemoryError_klass);
|
|
1705 f->do_oop((oop*) &_StackOverflowError_klass);
|
|
1706 f->do_oop((oop*) &_illegalMonitorStateException_klass);
|
|
1707 f->do_oop((oop*) &_protectionDomain_klass);
|
|
1708 f->do_oop((oop*) &_AccessControlContext_klass);
|
|
1709
|
|
1710 f->do_oop((oop*) &_reference_klass);
|
|
1711 f->do_oop((oop*) &_soft_reference_klass);
|
|
1712 f->do_oop((oop*) &_weak_reference_klass);
|
|
1713 f->do_oop((oop*) &_final_reference_klass);
|
|
1714 f->do_oop((oop*) &_phantom_reference_klass);
|
|
1715 f->do_oop((oop*) &_finalizer_klass);
|
|
1716
|
|
1717 f->do_oop((oop*) &_thread_klass);
|
|
1718 f->do_oop((oop*) &_threadGroup_klass);
|
|
1719 f->do_oop((oop*) &_properties_klass);
|
|
1720 f->do_oop((oop*) &_reflect_accessible_object_klass);
|
|
1721 f->do_oop((oop*) &_reflect_field_klass);
|
|
1722 f->do_oop((oop*) &_reflect_method_klass);
|
|
1723 f->do_oop((oop*) &_reflect_constructor_klass);
|
|
1724 f->do_oop((oop*) &_reflect_magic_klass);
|
|
1725 f->do_oop((oop*) &_reflect_method_accessor_klass);
|
|
1726 f->do_oop((oop*) &_reflect_constructor_accessor_klass);
|
|
1727 f->do_oop((oop*) &_reflect_delegating_classloader_klass);
|
|
1728 f->do_oop((oop*) &_reflect_constant_pool_klass);
|
|
1729 f->do_oop((oop*) &_reflect_unsafe_static_field_accessor_impl_klass);
|
|
1730
|
|
1731 f->do_oop((oop*) &_stringBuffer_klass);
|
|
1732 f->do_oop((oop*) &_vector_klass);
|
|
1733 f->do_oop((oop*) &_hashtable_klass);
|
|
1734
|
|
1735 f->do_oop((oop*) &_stackTraceElement_klass);
|
|
1736
|
|
1737 f->do_oop((oop*) &_java_nio_Buffer_klass);
|
|
1738
|
|
1739 f->do_oop((oop*) &_sun_misc_AtomicLongCSImpl_klass);
|
|
1740 f->do_oop((oop*) &_sun_jkernel_DownloadManager_klass);
|
|
1741
|
|
1742 f->do_oop((oop*) &_boolean_klass);
|
|
1743 f->do_oop((oop*) &_char_klass);
|
|
1744 f->do_oop((oop*) &_float_klass);
|
|
1745 f->do_oop((oop*) &_double_klass);
|
|
1746 f->do_oop((oop*) &_byte_klass);
|
|
1747 f->do_oop((oop*) &_short_klass);
|
|
1748 f->do_oop((oop*) &_int_klass);
|
|
1749 f->do_oop((oop*) &_long_klass);
|
|
1750 {
|
|
1751 for (int i = 0; i < T_VOID+1; i++) {
|
|
1752 if (_box_klasses[i] != NULL) {
|
|
1753 assert(i >= T_BOOLEAN, "checking");
|
|
1754 f->do_oop((oop*) &_box_klasses[i]);
|
|
1755 }
|
|
1756 }
|
|
1757 }
|
|
1758
|
|
1759 // The basic type mirrors would have already been processed in
|
|
1760 // Universe::oops_do(), via a call to shared_oops_do(), so should
|
|
1761 // not be processed again.
|
|
1762
|
|
1763 f->do_oop((oop*) &_system_loader_lock_obj);
|
|
1764 FilteredFieldsMap::klasses_oops_do(f);
|
|
1765 }
|
|
1766
|
|
1767 void SystemDictionary::lazily_loaded_oops_do(OopClosure* f) {
|
|
1768 f->do_oop((oop*) &_abstract_ownable_synchronizer_klass);
|
|
1769 }
|
|
1770
|
|
1771 // Just the classes from defining class loaders
|
|
1772 // Don't iterate over placeholders
|
|
1773 void SystemDictionary::classes_do(void f(klassOop)) {
|
|
1774 dictionary()->classes_do(f);
|
|
1775 }
|
|
1776
|
|
1777 // Added for initialize_itable_for_klass
|
|
1778 // Just the classes from defining class loaders
|
|
1779 // Don't iterate over placeholders
|
|
1780 void SystemDictionary::classes_do(void f(klassOop, TRAPS), TRAPS) {
|
|
1781 dictionary()->classes_do(f, CHECK);
|
|
1782 }
|
|
1783
|
|
1784 // All classes, and their class loaders
|
|
1785 // Don't iterate over placeholders
|
|
1786 void SystemDictionary::classes_do(void f(klassOop, oop)) {
|
|
1787 dictionary()->classes_do(f);
|
|
1788 }
|
|
1789
|
|
1790 // All classes, and their class loaders
|
|
1791 // (added for helpers that use HandleMarks and ResourceMarks)
|
|
1792 // Don't iterate over placeholders
|
|
1793 void SystemDictionary::classes_do(void f(klassOop, oop, TRAPS), TRAPS) {
|
|
1794 dictionary()->classes_do(f, CHECK);
|
|
1795 }
|
|
1796
|
|
1797 void SystemDictionary::placeholders_do(void f(symbolOop, oop)) {
|
|
1798 placeholders()->entries_do(f);
|
|
1799 }
|
|
1800
|
|
1801 void SystemDictionary::methods_do(void f(methodOop)) {
|
|
1802 dictionary()->methods_do(f);
|
|
1803 }
|
|
1804
|
|
1805 // ----------------------------------------------------------------------------
|
|
1806 // Lazily load klasses
|
|
1807
|
|
1808 void SystemDictionary::load_abstract_ownable_synchronizer_klass(TRAPS) {
|
|
1809 assert(JDK_Version::is_gte_jdk16x_version(), "Must be JDK 1.6 or later");
|
|
1810
|
|
1811 // if multiple threads calling this function, only one thread will load
|
|
1812 // the class. The other threads will find the loaded version once the
|
|
1813 // class is loaded.
|
|
1814 klassOop aos = _abstract_ownable_synchronizer_klass;
|
|
1815 if (aos == NULL) {
|
|
1816 klassOop k = resolve_or_fail(vmSymbolHandles::java_util_concurrent_locks_AbstractOwnableSynchronizer(), true, CHECK);
|
|
1817 // Force a fence to prevent any read before the write completes
|
|
1818 OrderAccess::fence();
|
|
1819 _abstract_ownable_synchronizer_klass = k;
|
|
1820 }
|
|
1821 }
|
|
1822
|
|
1823 // ----------------------------------------------------------------------------
|
|
1824 // Initialization
|
|
1825
|
|
1826 void SystemDictionary::initialize(TRAPS) {
|
|
1827 // Allocate arrays
|
|
1828 assert(dictionary() == NULL,
|
|
1829 "SystemDictionary should only be initialized once");
|
|
1830 _dictionary = new Dictionary(_nof_buckets);
|
|
1831 _placeholders = new PlaceholderTable(_nof_buckets);
|
|
1832 _number_of_modifications = 0;
|
|
1833 _loader_constraints = new LoaderConstraintTable(_loader_constraint_size);
|
|
1834 _resolution_errors = new ResolutionErrorTable(_resolution_error_size);
|
|
1835
|
|
1836 // Allocate private object used as system class loader lock
|
|
1837 _system_loader_lock_obj = oopFactory::new_system_objArray(0, CHECK);
|
|
1838 // Initialize basic classes
|
|
1839 initialize_preloaded_classes(CHECK);
|
|
1840 }
|
|
1841
|
|
1842
|
|
1843 void SystemDictionary::initialize_preloaded_classes(TRAPS) {
|
|
1844 assert(_object_klass == NULL, "preloaded classes should only be initialized once");
|
|
1845 // Preload commonly used klasses
|
|
1846 _object_klass = resolve_or_fail(vmSymbolHandles::java_lang_Object(), true, CHECK);
|
|
1847 _string_klass = resolve_or_fail(vmSymbolHandles::java_lang_String(), true, CHECK);
|
|
1848 _class_klass = resolve_or_fail(vmSymbolHandles::java_lang_Class(), true, CHECK);
|
|
1849 debug_only(instanceKlass::verify_class_klass_nonstatic_oop_maps(_class_klass));
|
|
1850 // Fixup mirrors for classes loaded before java.lang.Class.
|
|
1851 // These calls iterate over the objects currently in the perm gen
|
|
1852 // so calling them at this point is matters (not before when there
|
|
1853 // are fewer objects and not later after there are more objects
|
|
1854 // in the perm gen.
|
|
1855 Universe::initialize_basic_type_mirrors(CHECK);
|
|
1856 Universe::fixup_mirrors(CHECK);
|
|
1857
|
|
1858 _cloneable_klass = resolve_or_fail(vmSymbolHandles::java_lang_Cloneable(), true, CHECK);
|
|
1859 _classloader_klass = resolve_or_fail(vmSymbolHandles::java_lang_ClassLoader(), true, CHECK);
|
|
1860 _serializable_klass = resolve_or_fail(vmSymbolHandles::java_io_Serializable(), true, CHECK);
|
|
1861 _system_klass = resolve_or_fail(vmSymbolHandles::java_lang_System(), true, CHECK);
|
|
1862
|
|
1863 _throwable_klass = resolve_or_fail(vmSymbolHandles::java_lang_Throwable(), true, CHECK);
|
|
1864 _error_klass = resolve_or_fail(vmSymbolHandles::java_lang_Error(), true, CHECK);
|
|
1865 _threaddeath_klass = resolve_or_fail(vmSymbolHandles::java_lang_ThreadDeath(), true, CHECK);
|
|
1866 _exception_klass = resolve_or_fail(vmSymbolHandles::java_lang_Exception(), true, CHECK);
|
|
1867 _runtime_exception_klass = resolve_or_fail(vmSymbolHandles::java_lang_RuntimeException(), true, CHECK);
|
|
1868 _protectionDomain_klass = resolve_or_fail(vmSymbolHandles::java_security_ProtectionDomain(), true, CHECK);
|
|
1869 _AccessControlContext_klass = resolve_or_fail(vmSymbolHandles::java_security_AccessControlContext(), true, CHECK);
|
|
1870 _classNotFoundException_klass = resolve_or_fail(vmSymbolHandles::java_lang_ClassNotFoundException(), true, CHECK);
|
|
1871 _noClassDefFoundError_klass = resolve_or_fail(vmSymbolHandles::java_lang_NoClassDefFoundError(), true, CHECK);
|
|
1872 _linkageError_klass = resolve_or_fail(vmSymbolHandles::java_lang_LinkageError(), true, CHECK);
|
|
1873 _classCastException_klass = resolve_or_fail(vmSymbolHandles::java_lang_ClassCastException(), true, CHECK);
|
|
1874 _arrayStoreException_klass = resolve_or_fail(vmSymbolHandles::java_lang_ArrayStoreException(), true, CHECK);
|
|
1875 _virtualMachineError_klass = resolve_or_fail(vmSymbolHandles::java_lang_VirtualMachineError(), true, CHECK);
|
|
1876 _outOfMemoryError_klass = resolve_or_fail(vmSymbolHandles::java_lang_OutOfMemoryError(), true, CHECK);
|
|
1877 _StackOverflowError_klass = resolve_or_fail(vmSymbolHandles::java_lang_StackOverflowError(), true, CHECK);
|
|
1878 _illegalMonitorStateException_klass = resolve_or_fail(vmSymbolHandles::java_lang_IllegalMonitorStateException(), true, CHECK);
|
|
1879
|
|
1880 // Preload ref klasses and set reference types
|
|
1881 _reference_klass = resolve_or_fail(vmSymbolHandles::java_lang_ref_Reference(), true, CHECK);
|
|
1882 instanceKlass::cast(_reference_klass)->set_reference_type(REF_OTHER);
|
|
1883 instanceRefKlass::update_nonstatic_oop_maps(_reference_klass);
|
|
1884
|
|
1885 _soft_reference_klass = resolve_or_fail(vmSymbolHandles::java_lang_ref_SoftReference(), true, CHECK);
|
|
1886 instanceKlass::cast(_soft_reference_klass)->set_reference_type(REF_SOFT);
|
|
1887 _weak_reference_klass = resolve_or_fail(vmSymbolHandles::java_lang_ref_WeakReference(), true, CHECK);
|
|
1888 instanceKlass::cast(_weak_reference_klass)->set_reference_type(REF_WEAK);
|
|
1889 _final_reference_klass = resolve_or_fail(vmSymbolHandles::java_lang_ref_FinalReference(), true, CHECK);
|
|
1890 instanceKlass::cast(_final_reference_klass)->set_reference_type(REF_FINAL);
|
|
1891 _phantom_reference_klass = resolve_or_fail(vmSymbolHandles::java_lang_ref_PhantomReference(), true, CHECK);
|
|
1892 instanceKlass::cast(_phantom_reference_klass)->set_reference_type(REF_PHANTOM);
|
|
1893 _finalizer_klass = resolve_or_fail(vmSymbolHandles::java_lang_ref_Finalizer(), true, CHECK);
|
|
1894
|
|
1895 _thread_klass = resolve_or_fail(vmSymbolHandles::java_lang_Thread(), true, CHECK);
|
|
1896 _threadGroup_klass = resolve_or_fail(vmSymbolHandles::java_lang_ThreadGroup(), true, CHECK);
|
|
1897 _properties_klass = resolve_or_fail(vmSymbolHandles::java_util_Properties(), true, CHECK);
|
|
1898 _reflect_accessible_object_klass = resolve_or_fail(vmSymbolHandles::java_lang_reflect_AccessibleObject(), true, CHECK);
|
|
1899 _reflect_field_klass = resolve_or_fail(vmSymbolHandles::java_lang_reflect_Field(), true, CHECK);
|
|
1900 _reflect_method_klass = resolve_or_fail(vmSymbolHandles::java_lang_reflect_Method(), true, CHECK);
|
|
1901 _reflect_constructor_klass = resolve_or_fail(vmSymbolHandles::java_lang_reflect_Constructor(), true, CHECK);
|
|
1902 // Universe::is_gte_jdk14x_version() is not set up by this point.
|
|
1903 // It's okay if these turn out to be NULL in non-1.4 JDKs.
|
|
1904 _reflect_magic_klass = resolve_or_null(vmSymbolHandles::sun_reflect_MagicAccessorImpl(), CHECK);
|
|
1905 _reflect_method_accessor_klass = resolve_or_null(vmSymbolHandles::sun_reflect_MethodAccessorImpl(), CHECK);
|
|
1906 _reflect_constructor_accessor_klass = resolve_or_null(vmSymbolHandles::sun_reflect_ConstructorAccessorImpl(), CHECK);
|
|
1907 _reflect_delegating_classloader_klass = resolve_or_null(vmSymbolHandles::sun_reflect_DelegatingClassLoader(), CHECK);
|
|
1908 _reflect_constant_pool_klass = resolve_or_null(vmSymbolHandles::sun_reflect_ConstantPool(), CHECK);
|
|
1909 _reflect_unsafe_static_field_accessor_impl_klass = resolve_or_null(vmSymbolHandles::sun_reflect_UnsafeStaticFieldAccessorImpl(), CHECK);
|
|
1910
|
|
1911 _vector_klass = resolve_or_fail(vmSymbolHandles::java_util_Vector(), true, CHECK);
|
|
1912 _hashtable_klass = resolve_or_fail(vmSymbolHandles::java_util_Hashtable(), true, CHECK);
|
|
1913 _stringBuffer_klass = resolve_or_fail(vmSymbolHandles::java_lang_StringBuffer(), true, CHECK);
|
|
1914
|
|
1915 // It's NULL in non-1.4 JDKs.
|
|
1916 _stackTraceElement_klass = resolve_or_null(vmSymbolHandles::java_lang_StackTraceElement(), CHECK);
|
|
1917
|
|
1918 // Universe::is_gte_jdk14x_version() is not set up by this point.
|
|
1919 // It's okay if this turns out to be NULL in non-1.4 JDKs.
|
|
1920 _java_nio_Buffer_klass = resolve_or_null(vmSymbolHandles::java_nio_Buffer(), CHECK);
|
|
1921
|
|
1922 // If this class isn't present, it won't be referenced.
|
|
1923 _sun_misc_AtomicLongCSImpl_klass = resolve_or_null(vmSymbolHandles::sun_misc_AtomicLongCSImpl(), CHECK);
|
|
1924 #ifdef KERNEL
|
|
1925 _sun_jkernel_DownloadManager_klass = resolve_or_null(vmSymbolHandles::sun_jkernel_DownloadManager(), CHECK);
|
|
1926 if (_sun_jkernel_DownloadManager_klass == NULL) {
|
|
1927 warning("Cannot find sun/jkernel/DownloadManager");
|
|
1928 }
|
|
1929 #endif // KERNEL
|
|
1930
|
|
1931 // Preload boxing klasses
|
|
1932 _boolean_klass = resolve_or_fail(vmSymbolHandles::java_lang_Boolean(), true, CHECK);
|
|
1933 _char_klass = resolve_or_fail(vmSymbolHandles::java_lang_Character(), true, CHECK);
|
|
1934 _float_klass = resolve_or_fail(vmSymbolHandles::java_lang_Float(), true, CHECK);
|
|
1935 _double_klass = resolve_or_fail(vmSymbolHandles::java_lang_Double(), true, CHECK);
|
|
1936 _byte_klass = resolve_or_fail(vmSymbolHandles::java_lang_Byte(), true, CHECK);
|
|
1937 _short_klass = resolve_or_fail(vmSymbolHandles::java_lang_Short(), true, CHECK);
|
|
1938 _int_klass = resolve_or_fail(vmSymbolHandles::java_lang_Integer(), true, CHECK);
|
|
1939 _long_klass = resolve_or_fail(vmSymbolHandles::java_lang_Long(), true, CHECK);
|
|
1940
|
|
1941 _box_klasses[T_BOOLEAN] = _boolean_klass;
|
|
1942 _box_klasses[T_CHAR] = _char_klass;
|
|
1943 _box_klasses[T_FLOAT] = _float_klass;
|
|
1944 _box_klasses[T_DOUBLE] = _double_klass;
|
|
1945 _box_klasses[T_BYTE] = _byte_klass;
|
|
1946 _box_klasses[T_SHORT] = _short_klass;
|
|
1947 _box_klasses[T_INT] = _int_klass;
|
|
1948 _box_klasses[T_LONG] = _long_klass;
|
|
1949 //_box_klasses[T_OBJECT] = _object_klass;
|
|
1950 //_box_klasses[T_ARRAY] = _object_klass;
|
|
1951
|
|
1952 { // Compute whether we should use loadClass or loadClassInternal when loading classes.
|
|
1953 methodOop method = instanceKlass::cast(classloader_klass())->find_method(vmSymbols::loadClassInternal_name(), vmSymbols::string_class_signature());
|
|
1954 _has_loadClassInternal = (method != NULL);
|
|
1955 }
|
|
1956
|
|
1957 { // Compute whether we should use checkPackageAccess or NOT
|
|
1958 methodOop method = instanceKlass::cast(classloader_klass())->find_method(vmSymbols::checkPackageAccess_name(), vmSymbols::class_protectiondomain_signature());
|
|
1959 _has_checkPackageAccess = (method != NULL);
|
|
1960 }
|
|
1961 }
|
|
1962
|
|
1963 // Tells if a given klass is a box (wrapper class, such as java.lang.Integer).
|
|
1964 // If so, returns the basic type it holds. If not, returns T_OBJECT.
|
|
1965 BasicType SystemDictionary::box_klass_type(klassOop k) {
|
|
1966 assert(k != NULL, "");
|
|
1967 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
|
|
1968 if (_box_klasses[i] == k)
|
|
1969 return (BasicType)i;
|
|
1970 }
|
|
1971 return T_OBJECT;
|
|
1972 }
|
|
1973
|
|
1974 // Constraints on class loaders. The details of the algorithm can be
|
|
1975 // found in the OOPSLA'98 paper "Dynamic Class Loading in the Java
|
|
1976 // Virtual Machine" by Sheng Liang and Gilad Bracha. The basic idea is
|
|
1977 // that the system dictionary needs to maintain a set of contraints that
|
|
1978 // must be satisfied by all classes in the dictionary.
|
|
1979 // if defining is true, then LinkageError if already in systemDictionary
|
|
1980 // if initiating loader, then ok if instanceKlass matches existing entry
|
|
1981
|
|
1982 void SystemDictionary::check_constraints(int d_index, unsigned int d_hash,
|
|
1983 instanceKlassHandle k,
|
|
1984 Handle class_loader, bool defining,
|
|
1985 TRAPS) {
|
|
1986 const char *linkage_error = NULL;
|
|
1987 {
|
|
1988 symbolHandle name (THREAD, k->name());
|
|
1989 MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
1990
|
|
1991 klassOop check = find_class(d_index, d_hash, name, class_loader);
|
|
1992 if (check != (klassOop)NULL) {
|
|
1993 // if different instanceKlass - duplicate class definition,
|
|
1994 // else - ok, class loaded by a different thread in parallel,
|
|
1995 // we should only have found it if it was done loading and ok to use
|
|
1996 // system dictionary only holds instance classes, placeholders
|
|
1997 // also holds array classes
|
|
1998
|
|
1999 assert(check->klass_part()->oop_is_instance(), "noninstance in systemdictionary");
|
|
2000 if ((defining == true) || (k() != check)) {
|
|
2001 linkage_error = "loader (instance of %s): attempted duplicate class "
|
|
2002 "definition for name: \"%s\"";
|
|
2003 } else {
|
|
2004 return;
|
|
2005 }
|
|
2006 }
|
|
2007
|
|
2008 #ifdef ASSERT
|
|
2009 unsigned int p_hash = placeholders()->compute_hash(name, class_loader);
|
|
2010 int p_index = placeholders()->hash_to_index(p_hash);
|
|
2011 symbolOop ph_check = find_placeholder(p_index, p_hash, name, class_loader);
|
|
2012 assert(ph_check == NULL || ph_check == name(), "invalid symbol");
|
|
2013 #endif
|
|
2014
|
|
2015 if (linkage_error == NULL) {
|
|
2016 if (constraints()->check_or_update(k, class_loader, name) == false) {
|
|
2017 linkage_error = "loader constraint violation: loader (instance of %s)"
|
|
2018 " previously initiated loading for a different type with name \"%s\"";
|
|
2019 }
|
|
2020 }
|
|
2021 }
|
|
2022
|
|
2023 // Throw error now if needed (cannot throw while holding
|
|
2024 // SystemDictionary_lock because of rank ordering)
|
|
2025
|
|
2026 if (linkage_error) {
|
|
2027 ResourceMark rm(THREAD);
|
|
2028 const char* class_loader_name = loader_name(class_loader());
|
|
2029 char* type_name = k->name()->as_C_string();
|
|
2030 size_t buflen = strlen(linkage_error) + strlen(class_loader_name) +
|
|
2031 strlen(type_name);
|
|
2032 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
|
|
2033 jio_snprintf(buf, buflen, linkage_error, class_loader_name, type_name);
|
|
2034 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
|
|
2035 }
|
|
2036 }
|
|
2037
|
|
2038
|
|
2039 // Update system dictionary - done after check_constraint and add_to_hierachy
|
|
2040 // have been called.
|
|
2041 void SystemDictionary::update_dictionary(int d_index, unsigned int d_hash,
|
|
2042 int p_index, unsigned int p_hash,
|
|
2043 instanceKlassHandle k,
|
|
2044 Handle class_loader,
|
|
2045 TRAPS) {
|
|
2046 // Compile_lock prevents systemDictionary updates during compilations
|
|
2047 assert_locked_or_safepoint(Compile_lock);
|
|
2048 symbolHandle name (THREAD, k->name());
|
|
2049
|
|
2050 {
|
|
2051 MutexLocker mu1(SystemDictionary_lock, THREAD);
|
|
2052
|
|
2053 // See whether biased locking is enabled and if so set it for this
|
|
2054 // klass.
|
|
2055 // Note that this must be done past the last potential blocking
|
|
2056 // point / safepoint. We enable biased locking lazily using a
|
|
2057 // VM_Operation to iterate the SystemDictionary and installing the
|
|
2058 // biasable mark word into each instanceKlass's prototype header.
|
|
2059 // To avoid race conditions where we accidentally miss enabling the
|
|
2060 // optimization for one class in the process of being added to the
|
|
2061 // dictionary, we must not safepoint after the test of
|
|
2062 // BiasedLocking::enabled().
|
|
2063 if (UseBiasedLocking && BiasedLocking::enabled()) {
|
|
2064 // Set biased locking bit for all loaded classes; it will be
|
|
2065 // cleared if revocation occurs too often for this type
|
|
2066 // NOTE that we must only do this when the class is initally
|
|
2067 // defined, not each time it is referenced from a new class loader
|
|
2068 if (k->class_loader() == class_loader()) {
|
|
2069 k->set_prototype_header(markOopDesc::biased_locking_prototype());
|
|
2070 }
|
|
2071 }
|
|
2072
|
|
2073 // Check for a placeholder. If there, remove it and make a
|
|
2074 // new system dictionary entry.
|
|
2075 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD);
|
|
2076 klassOop sd_check = find_class(d_index, d_hash, name, class_loader);
|
|
2077 if (sd_check == NULL) {
|
|
2078 dictionary()->add_klass(name, class_loader, k);
|
|
2079 notice_modification();
|
|
2080 }
|
|
2081 #ifdef ASSERT
|
|
2082 sd_check = find_class(d_index, d_hash, name, class_loader);
|
|
2083 assert (sd_check != NULL, "should have entry in system dictionary");
|
|
2084 // Changed to allow PH to remain to complete class circularity checking
|
|
2085 // while only one thread can define a class at one time, multiple
|
|
2086 // classes can resolve the superclass for a class at one time,
|
|
2087 // and the placeholder is used to track that
|
|
2088 // symbolOop ph_check = find_placeholder(p_index, p_hash, name, class_loader);
|
|
2089 // assert (ph_check == NULL, "should not have a placeholder entry");
|
|
2090 #endif
|
|
2091 SystemDictionary_lock->notify_all();
|
|
2092 }
|
|
2093 }
|
|
2094
|
|
2095
|
|
2096 klassOop SystemDictionary::find_constrained_instance_or_array_klass(
|
|
2097 symbolHandle class_name, Handle class_loader, TRAPS) {
|
|
2098
|
|
2099 // First see if it has been loaded directly.
|
|
2100 // Force the protection domain to be null. (This removes protection checks.)
|
|
2101 Handle no_protection_domain;
|
|
2102 klassOop klass = find_instance_or_array_klass(class_name, class_loader,
|
|
2103 no_protection_domain, CHECK_NULL);
|
|
2104 if (klass != NULL)
|
|
2105 return klass;
|
|
2106
|
|
2107 // Now look to see if it has been loaded elsewhere, and is subject to
|
|
2108 // a loader constraint that would require this loader to return the
|
|
2109 // klass that is already loaded.
|
|
2110 if (FieldType::is_array(class_name())) {
|
|
2111 // Array classes are hard because their klassOops are not kept in the
|
|
2112 // constraint table. The array klass may be constrained, but the elem class
|
|
2113 // may not be.
|
|
2114 jint dimension;
|
|
2115 symbolOop object_key;
|
|
2116 BasicType t = FieldType::get_array_info(class_name(), &dimension,
|
|
2117 &object_key, CHECK_(NULL));
|
|
2118 if (t != T_OBJECT) {
|
|
2119 klass = Universe::typeArrayKlassObj(t);
|
|
2120 } else {
|
|
2121 symbolHandle elem_name(THREAD, object_key);
|
|
2122 MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
2123 klass = constraints()->find_constrained_elem_klass(class_name, elem_name, class_loader, THREAD);
|
|
2124 }
|
|
2125 if (klass != NULL) {
|
|
2126 klass = Klass::cast(klass)->array_klass_or_null(dimension);
|
|
2127 }
|
|
2128 } else {
|
|
2129 MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
2130 // Non-array classes are easy: simply check the constraint table.
|
|
2131 klass = constraints()->find_constrained_klass(class_name, class_loader);
|
|
2132 }
|
|
2133
|
|
2134 return klass;
|
|
2135 }
|
|
2136
|
|
2137
|
|
2138 bool SystemDictionary::add_loader_constraint(symbolHandle class_name,
|
|
2139 Handle class_loader1,
|
|
2140 Handle class_loader2,
|
|
2141 Thread* THREAD) {
|
|
2142 unsigned int d_hash1 = dictionary()->compute_hash(class_name, class_loader1);
|
|
2143 int d_index1 = dictionary()->hash_to_index(d_hash1);
|
|
2144
|
|
2145 unsigned int d_hash2 = dictionary()->compute_hash(class_name, class_loader2);
|
|
2146 int d_index2 = dictionary()->hash_to_index(d_hash2);
|
|
2147
|
|
2148 {
|
|
2149 MutexLocker mu_s(SystemDictionary_lock, THREAD);
|
|
2150
|
|
2151 // Better never do a GC while we're holding these oops
|
|
2152 No_Safepoint_Verifier nosafepoint;
|
|
2153
|
|
2154 klassOop klass1 = find_class(d_index1, d_hash1, class_name, class_loader1);
|
|
2155 klassOop klass2 = find_class(d_index2, d_hash2, class_name, class_loader2);
|
|
2156 return constraints()->add_entry(class_name, klass1, class_loader1,
|
|
2157 klass2, class_loader2);
|
|
2158 }
|
|
2159 }
|
|
2160
|
|
2161 // Add entry to resolution error table to record the error when the first
|
|
2162 // attempt to resolve a reference to a class has failed.
|
|
2163 void SystemDictionary::add_resolution_error(constantPoolHandle pool, int which, symbolHandle error) {
|
|
2164 unsigned int hash = resolution_errors()->compute_hash(pool, which);
|
|
2165 int index = resolution_errors()->hash_to_index(hash);
|
|
2166 {
|
|
2167 MutexLocker ml(SystemDictionary_lock, Thread::current());
|
|
2168 resolution_errors()->add_entry(index, hash, pool, which, error);
|
|
2169 }
|
|
2170 }
|
|
2171
|
|
2172 // Lookup resolution error table. Returns error if found, otherwise NULL.
|
|
2173 symbolOop SystemDictionary::find_resolution_error(constantPoolHandle pool, int which) {
|
|
2174 unsigned int hash = resolution_errors()->compute_hash(pool, which);
|
|
2175 int index = resolution_errors()->hash_to_index(hash);
|
|
2176 {
|
|
2177 MutexLocker ml(SystemDictionary_lock, Thread::current());
|
|
2178 ResolutionErrorEntry* entry = resolution_errors()->find_entry(index, hash, pool, which);
|
|
2179 return (entry != NULL) ? entry->error() : (symbolOop)NULL;
|
|
2180 }
|
|
2181 }
|
|
2182
|
|
2183
|
|
2184 // Make sure all class components (including arrays) in the given
|
|
2185 // signature will be resolved to the same class in both loaders.
|
|
2186 // Returns the name of the type that failed a loader constraint check, or
|
|
2187 // NULL if no constraint failed. The returned C string needs cleaning up
|
|
2188 // with a ResourceMark in the caller
|
|
2189 char* SystemDictionary::check_signature_loaders(symbolHandle signature,
|
|
2190 Handle loader1, Handle loader2,
|
|
2191 bool is_method, TRAPS) {
|
|
2192 // Nothing to do if loaders are the same.
|
|
2193 if (loader1() == loader2()) {
|
|
2194 return NULL;
|
|
2195 }
|
|
2196
|
|
2197 SignatureStream sig_strm(signature, is_method);
|
|
2198 while (!sig_strm.is_done()) {
|
|
2199 if (sig_strm.is_object()) {
|
|
2200 symbolOop s = sig_strm.as_symbol(CHECK_NULL);
|
|
2201 symbolHandle sig (THREAD, s);
|
|
2202 if (!add_loader_constraint(sig, loader1, loader2, THREAD)) {
|
|
2203 return sig()->as_C_string();
|
|
2204 }
|
|
2205 }
|
|
2206 sig_strm.next();
|
|
2207 }
|
|
2208 return NULL;
|
|
2209 }
|
|
2210
|
|
2211
|
|
2212 // Since the identity hash code for symbols changes when the symbols are
|
|
2213 // moved from the regular perm gen (hash in the mark word) to the shared
|
|
2214 // spaces (hash is the address), the classes loaded into the dictionary
|
|
2215 // may be in the wrong buckets.
|
|
2216
|
|
2217 void SystemDictionary::reorder_dictionary() {
|
|
2218 dictionary()->reorder_dictionary();
|
|
2219 }
|
|
2220
|
|
2221
|
|
2222 void SystemDictionary::copy_buckets(char** top, char* end) {
|
|
2223 dictionary()->copy_buckets(top, end);
|
|
2224 }
|
|
2225
|
|
2226
|
|
2227 void SystemDictionary::copy_table(char** top, char* end) {
|
|
2228 dictionary()->copy_table(top, end);
|
|
2229 }
|
|
2230
|
|
2231
|
|
2232 void SystemDictionary::reverse() {
|
|
2233 dictionary()->reverse();
|
|
2234 }
|
|
2235
|
|
2236 int SystemDictionary::number_of_classes() {
|
|
2237 return dictionary()->number_of_entries();
|
|
2238 }
|
|
2239
|
|
2240
|
|
2241 // ----------------------------------------------------------------------------
|
|
2242 #ifndef PRODUCT
|
|
2243
|
|
2244 void SystemDictionary::print() {
|
|
2245 dictionary()->print();
|
|
2246
|
|
2247 // Placeholders
|
|
2248 GCMutexLocker mu(SystemDictionary_lock);
|
|
2249 placeholders()->print();
|
|
2250
|
|
2251 // loader constraints - print under SD_lock
|
|
2252 constraints()->print();
|
|
2253 }
|
|
2254
|
|
2255 #endif
|
|
2256
|
|
2257 void SystemDictionary::verify() {
|
|
2258 guarantee(dictionary() != NULL, "Verify of system dictionary failed");
|
|
2259 guarantee(constraints() != NULL,
|
|
2260 "Verify of loader constraints failed");
|
|
2261 guarantee(dictionary()->number_of_entries() >= 0 &&
|
|
2262 placeholders()->number_of_entries() >= 0,
|
|
2263 "Verify of system dictionary failed");
|
|
2264
|
|
2265 // Verify dictionary
|
|
2266 dictionary()->verify();
|
|
2267
|
|
2268 GCMutexLocker mu(SystemDictionary_lock);
|
|
2269 placeholders()->verify();
|
|
2270
|
|
2271 // Verify constraint table
|
|
2272 guarantee(constraints() != NULL, "Verify of loader constraints failed");
|
|
2273 constraints()->verify(dictionary());
|
|
2274 }
|
|
2275
|
|
2276
|
|
2277 void SystemDictionary::verify_obj_klass_present(Handle obj,
|
|
2278 symbolHandle class_name,
|
|
2279 Handle class_loader) {
|
|
2280 GCMutexLocker mu(SystemDictionary_lock);
|
|
2281 oop probe = find_class_or_placeholder(class_name, class_loader);
|
|
2282 if (probe == NULL) {
|
|
2283 probe = SystemDictionary::find_shared_class(class_name);
|
|
2284 }
|
|
2285 guarantee(probe != NULL &&
|
|
2286 (!probe->is_klass() || probe == obj()),
|
|
2287 "Loaded klasses should be in SystemDictionary");
|
|
2288 }
|
|
2289
|
|
2290 #ifndef PRODUCT
|
|
2291
|
|
2292 // statistics code
|
|
2293 class ClassStatistics: AllStatic {
|
|
2294 private:
|
|
2295 static int nclasses; // number of classes
|
|
2296 static int nmethods; // number of methods
|
|
2297 static int nmethoddata; // number of methodData
|
|
2298 static int class_size; // size of class objects in words
|
|
2299 static int method_size; // size of method objects in words
|
|
2300 static int debug_size; // size of debug info in methods
|
|
2301 static int methoddata_size; // size of methodData objects in words
|
|
2302
|
|
2303 static void do_class(klassOop k) {
|
|
2304 nclasses++;
|
|
2305 class_size += k->size();
|
|
2306 if (k->klass_part()->oop_is_instance()) {
|
|
2307 instanceKlass* ik = (instanceKlass*)k->klass_part();
|
|
2308 class_size += ik->methods()->size();
|
|
2309 class_size += ik->constants()->size();
|
|
2310 class_size += ik->local_interfaces()->size();
|
|
2311 class_size += ik->transitive_interfaces()->size();
|
|
2312 // We do not have to count implementors, since we only store one!
|
|
2313 class_size += ik->fields()->size();
|
|
2314 }
|
|
2315 }
|
|
2316
|
|
2317 static void do_method(methodOop m) {
|
|
2318 nmethods++;
|
|
2319 method_size += m->size();
|
|
2320 // class loader uses same objArray for empty vectors, so don't count these
|
|
2321 if (m->exception_table()->length() != 0) method_size += m->exception_table()->size();
|
|
2322 if (m->has_stackmap_table()) {
|
|
2323 method_size += m->stackmap_data()->size();
|
|
2324 }
|
|
2325
|
|
2326 methodDataOop mdo = m->method_data();
|
|
2327 if (mdo != NULL) {
|
|
2328 nmethoddata++;
|
|
2329 methoddata_size += mdo->size();
|
|
2330 }
|
|
2331 }
|
|
2332
|
|
2333 public:
|
|
2334 static void print() {
|
|
2335 SystemDictionary::classes_do(do_class);
|
|
2336 SystemDictionary::methods_do(do_method);
|
|
2337 tty->print_cr("Class statistics:");
|
|
2338 tty->print_cr("%d classes (%d bytes)", nclasses, class_size * oopSize);
|
|
2339 tty->print_cr("%d methods (%d bytes = %d base + %d debug info)", nmethods,
|
|
2340 (method_size + debug_size) * oopSize, method_size * oopSize, debug_size * oopSize);
|
|
2341 tty->print_cr("%d methoddata (%d bytes)", nmethoddata, methoddata_size * oopSize);
|
|
2342 }
|
|
2343 };
|
|
2344
|
|
2345
|
|
2346 int ClassStatistics::nclasses = 0;
|
|
2347 int ClassStatistics::nmethods = 0;
|
|
2348 int ClassStatistics::nmethoddata = 0;
|
|
2349 int ClassStatistics::class_size = 0;
|
|
2350 int ClassStatistics::method_size = 0;
|
|
2351 int ClassStatistics::debug_size = 0;
|
|
2352 int ClassStatistics::methoddata_size = 0;
|
|
2353
|
|
2354 void SystemDictionary::print_class_statistics() {
|
|
2355 ResourceMark rm;
|
|
2356 ClassStatistics::print();
|
|
2357 }
|
|
2358
|
|
2359
|
|
2360 class MethodStatistics: AllStatic {
|
|
2361 public:
|
|
2362 enum {
|
|
2363 max_parameter_size = 10
|
|
2364 };
|
|
2365 private:
|
|
2366
|
|
2367 static int _number_of_methods;
|
|
2368 static int _number_of_final_methods;
|
|
2369 static int _number_of_static_methods;
|
|
2370 static int _number_of_native_methods;
|
|
2371 static int _number_of_synchronized_methods;
|
|
2372 static int _number_of_profiled_methods;
|
|
2373 static int _number_of_bytecodes;
|
|
2374 static int _parameter_size_profile[max_parameter_size];
|
|
2375 static int _bytecodes_profile[Bytecodes::number_of_java_codes];
|
|
2376
|
|
2377 static void initialize() {
|
|
2378 _number_of_methods = 0;
|
|
2379 _number_of_final_methods = 0;
|
|
2380 _number_of_static_methods = 0;
|
|
2381 _number_of_native_methods = 0;
|
|
2382 _number_of_synchronized_methods = 0;
|
|
2383 _number_of_profiled_methods = 0;
|
|
2384 _number_of_bytecodes = 0;
|
|
2385 for (int i = 0; i < max_parameter_size ; i++) _parameter_size_profile[i] = 0;
|
|
2386 for (int j = 0; j < Bytecodes::number_of_java_codes; j++) _bytecodes_profile [j] = 0;
|
|
2387 };
|
|
2388
|
|
2389 static void do_method(methodOop m) {
|
|
2390 _number_of_methods++;
|
|
2391 // collect flag info
|
|
2392 if (m->is_final() ) _number_of_final_methods++;
|
|
2393 if (m->is_static() ) _number_of_static_methods++;
|
|
2394 if (m->is_native() ) _number_of_native_methods++;
|
|
2395 if (m->is_synchronized()) _number_of_synchronized_methods++;
|
|
2396 if (m->method_data() != NULL) _number_of_profiled_methods++;
|
|
2397 // collect parameter size info (add one for receiver, if any)
|
|
2398 _parameter_size_profile[MIN2(m->size_of_parameters() + (m->is_static() ? 0 : 1), max_parameter_size - 1)]++;
|
|
2399 // collect bytecodes info
|
|
2400 {
|
|
2401 Thread *thread = Thread::current();
|
|
2402 HandleMark hm(thread);
|
|
2403 BytecodeStream s(methodHandle(thread, m));
|
|
2404 Bytecodes::Code c;
|
|
2405 while ((c = s.next()) >= 0) {
|
|
2406 _number_of_bytecodes++;
|
|
2407 _bytecodes_profile[c]++;
|
|
2408 }
|
|
2409 }
|
|
2410 }
|
|
2411
|
|
2412 public:
|
|
2413 static void print() {
|
|
2414 initialize();
|
|
2415 SystemDictionary::methods_do(do_method);
|
|
2416 // generate output
|
|
2417 tty->cr();
|
|
2418 tty->print_cr("Method statistics (static):");
|
|
2419 // flag distribution
|
|
2420 tty->cr();
|
|
2421 tty->print_cr("%6d final methods %6.1f%%", _number_of_final_methods , _number_of_final_methods * 100.0F / _number_of_methods);
|
|
2422 tty->print_cr("%6d static methods %6.1f%%", _number_of_static_methods , _number_of_static_methods * 100.0F / _number_of_methods);
|
|
2423 tty->print_cr("%6d native methods %6.1f%%", _number_of_native_methods , _number_of_native_methods * 100.0F / _number_of_methods);
|
|
2424 tty->print_cr("%6d synchronized methods %6.1f%%", _number_of_synchronized_methods, _number_of_synchronized_methods * 100.0F / _number_of_methods);
|
|
2425 tty->print_cr("%6d profiled methods %6.1f%%", _number_of_profiled_methods, _number_of_profiled_methods * 100.0F / _number_of_methods);
|
|
2426 // parameter size profile
|
|
2427 tty->cr();
|
|
2428 { int tot = 0;
|
|
2429 int avg = 0;
|
|
2430 for (int i = 0; i < max_parameter_size; i++) {
|
|
2431 int n = _parameter_size_profile[i];
|
|
2432 tot += n;
|
|
2433 avg += n*i;
|
|
2434 tty->print_cr("parameter size = %1d: %6d methods %5.1f%%", i, n, n * 100.0F / _number_of_methods);
|
|
2435 }
|
|
2436 assert(tot == _number_of_methods, "should be the same");
|
|
2437 tty->print_cr(" %6d methods 100.0%%", _number_of_methods);
|
|
2438 tty->print_cr("(average parameter size = %3.1f including receiver, if any)", (float)avg / _number_of_methods);
|
|
2439 }
|
|
2440 // bytecodes profile
|
|
2441 tty->cr();
|
|
2442 { int tot = 0;
|
|
2443 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) {
|
|
2444 if (Bytecodes::is_defined(i)) {
|
|
2445 Bytecodes::Code c = Bytecodes::cast(i);
|
|
2446 int n = _bytecodes_profile[c];
|
|
2447 tot += n;
|
|
2448 tty->print_cr("%9d %7.3f%% %s", n, n * 100.0F / _number_of_bytecodes, Bytecodes::name(c));
|
|
2449 }
|
|
2450 }
|
|
2451 assert(tot == _number_of_bytecodes, "should be the same");
|
|
2452 tty->print_cr("%9d 100.000%%", _number_of_bytecodes);
|
|
2453 }
|
|
2454 tty->cr();
|
|
2455 }
|
|
2456 };
|
|
2457
|
|
2458 int MethodStatistics::_number_of_methods;
|
|
2459 int MethodStatistics::_number_of_final_methods;
|
|
2460 int MethodStatistics::_number_of_static_methods;
|
|
2461 int MethodStatistics::_number_of_native_methods;
|
|
2462 int MethodStatistics::_number_of_synchronized_methods;
|
|
2463 int MethodStatistics::_number_of_profiled_methods;
|
|
2464 int MethodStatistics::_number_of_bytecodes;
|
|
2465 int MethodStatistics::_parameter_size_profile[MethodStatistics::max_parameter_size];
|
|
2466 int MethodStatistics::_bytecodes_profile[Bytecodes::number_of_java_codes];
|
|
2467
|
|
2468
|
|
2469 void SystemDictionary::print_method_statistics() {
|
|
2470 MethodStatistics::print();
|
|
2471 }
|
|
2472
|
|
2473 #endif // PRODUCT
|