Mercurial > hg > truffle
annotate src/share/vm/classfile/systemDictionary.hpp @ 196:d1605aabd0a1 jdk7-b30
6719955: Update copyright year
Summary: Update copyright year for files that have been modified in 2008
Reviewed-by: ohair, tbell
| author | xdono |
|---|---|
| date | Wed, 02 Jul 2008 12:55:16 -0700 |
| parents | 83c868b757c0 |
| children | a45484ea312d |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 196 | 2 * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 // The system dictionary stores all loaded classes and maps: | |
| 26 // | |
| 27 // [class name,class loader] -> class i.e. [symbolOop,oop] -> klassOop | |
| 28 // | |
| 29 // Classes are loaded lazily. The default VM class loader is | |
| 30 // represented as NULL. | |
| 31 | |
| 32 // The underlying data structure is an open hash table with a fixed number | |
| 33 // of buckets. During loading the loader object is locked, (for the VM loader | |
| 34 // a private lock object is used). Class loading can thus be done concurrently, | |
| 35 // but only by different loaders. | |
| 36 // | |
| 37 // During loading a placeholder (name, loader) is temporarily placed in | |
| 38 // a side data structure, and is used to detect ClassCircularityErrors | |
| 39 // and to perform verification during GC. A GC can occur in the midst | |
| 40 // of class loading, as we call out to Java, have to take locks, etc. | |
| 41 // | |
| 42 // When class loading is finished, a new entry is added to the system | |
| 43 // dictionary and the place holder is removed. Note that the protection | |
| 44 // domain field of the system dictionary has not yet been filled in when | |
| 45 // the "real" system dictionary entry is created. | |
| 46 // | |
| 47 // Clients of this class who are interested in finding if a class has | |
| 48 // been completely loaded -- not classes in the process of being loaded -- | |
| 49 // can read the SystemDictionary unlocked. This is safe because | |
| 50 // - entries are only deleted at safepoints | |
| 51 // - readers cannot come to a safepoint while actively examining | |
| 52 // an entry (an entry cannot be deleted from under a reader) | |
| 53 // - entries must be fully formed before they are available to concurrent | |
| 54 // readers (we must ensure write ordering) | |
| 55 // | |
| 56 // Note that placeholders are deleted at any time, as they are removed | |
| 57 // when a class is completely loaded. Therefore, readers as well as writers | |
| 58 // of placeholders must hold the SystemDictionary_lock. | |
| 59 // | |
| 60 | |
| 61 class Dictionary; | |
| 62 class PlaceholderTable; | |
| 63 class LoaderConstraintTable; | |
| 64 class HashtableBucket; | |
| 65 class ResolutionErrorTable; | |
| 66 | |
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67 // Certain classes are preloaded, such as java.lang.Object and java.lang.String. |
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68 // They are all "well-known", in the sense that no class loader is allowed |
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69 // to provide a different definition. |
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70 // |
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71 // These klasses must all have names defined in vmSymbols. |
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72 |
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73 #define WK_KLASS_ENUM_NAME(kname) kname##_knum |
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74 |
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75 // Each well-known class has a short klass name (like object_klass), |
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76 // a vmSymbol name (like java_lang_Object), and a flag word |
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77 // that makes some minor distinctions, like whether the klass |
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78 // is preloaded, optional, release-specific, etc. |
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79 // The order of these definitions is significant; it is the order in which |
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80 // preloading is actually performed by initialize_preloaded_classes. |
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81 |
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82 #define WK_KLASSES_DO(template) \ |
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83 /* well-known classes */ \ |
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84 template(object_klass, java_lang_Object, Pre) \ |
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85 template(string_klass, java_lang_String, Pre) \ |
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86 template(class_klass, java_lang_Class, Pre) \ |
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87 template(cloneable_klass, java_lang_Cloneable, Pre) \ |
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88 template(classloader_klass, java_lang_ClassLoader, Pre) \ |
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89 template(serializable_klass, java_io_Serializable, Pre) \ |
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90 template(system_klass, java_lang_System, Pre) \ |
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91 template(throwable_klass, java_lang_Throwable, Pre) \ |
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92 template(error_klass, java_lang_Error, Pre) \ |
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93 template(threaddeath_klass, java_lang_ThreadDeath, Pre) \ |
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94 template(exception_klass, java_lang_Exception, Pre) \ |
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95 template(runtime_exception_klass, java_lang_RuntimeException, Pre) \ |
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96 template(protectionDomain_klass, java_security_ProtectionDomain, Pre) \ |
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97 template(AccessControlContext_klass, java_security_AccessControlContext, Pre) \ |
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98 template(classNotFoundException_klass, java_lang_ClassNotFoundException, Pre) \ |
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99 template(noClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre) \ |
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100 template(linkageError_klass, java_lang_LinkageError, Pre) \ |
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101 template(ClassCastException_klass, java_lang_ClassCastException, Pre) \ |
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102 template(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre) \ |
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103 template(virtualMachineError_klass, java_lang_VirtualMachineError, Pre) \ |
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104 template(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre) \ |
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105 template(StackOverflowError_klass, java_lang_StackOverflowError, Pre) \ |
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106 template(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre) \ |
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107 template(reference_klass, java_lang_ref_Reference, Pre) \ |
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108 \ |
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109 /* Preload ref klasses and set reference types */ \ |
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110 template(soft_reference_klass, java_lang_ref_SoftReference, Pre) \ |
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111 template(weak_reference_klass, java_lang_ref_WeakReference, Pre) \ |
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112 template(final_reference_klass, java_lang_ref_FinalReference, Pre) \ |
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113 template(phantom_reference_klass, java_lang_ref_PhantomReference, Pre) \ |
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114 template(finalizer_klass, java_lang_ref_Finalizer, Pre) \ |
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115 \ |
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116 template(thread_klass, java_lang_Thread, Pre) \ |
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117 template(threadGroup_klass, java_lang_ThreadGroup, Pre) \ |
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118 template(properties_klass, java_util_Properties, Pre) \ |
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119 template(reflect_accessible_object_klass, java_lang_reflect_AccessibleObject, Pre) \ |
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120 template(reflect_field_klass, java_lang_reflect_Field, Pre) \ |
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121 template(reflect_method_klass, java_lang_reflect_Method, Pre) \ |
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122 template(reflect_constructor_klass, java_lang_reflect_Constructor, Pre) \ |
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123 \ |
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124 /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \ |
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125 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \ |
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126 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \ |
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127 template(reflect_magic_klass, sun_reflect_MagicAccessorImpl, Opt) \ |
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128 template(reflect_method_accessor_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \ |
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129 template(reflect_constructor_accessor_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \ |
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130 template(reflect_delegating_classloader_klass, sun_reflect_DelegatingClassLoader, Opt) \ |
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131 template(reflect_constant_pool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15) \ |
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132 template(reflect_unsafe_static_field_accessor_impl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15) \ |
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133 \ |
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134 template(vector_klass, java_util_Vector, Pre) \ |
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135 template(hashtable_klass, java_util_Hashtable, Pre) \ |
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136 template(stringBuffer_klass, java_lang_StringBuffer, Pre) \ |
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137 \ |
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138 /* It's NULL in non-1.4 JDKs. */ \ |
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139 template(stackTraceElement_klass, java_lang_StackTraceElement, Opt) \ |
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140 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \ |
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141 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \ |
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142 template(java_nio_Buffer_klass, java_nio_Buffer, Opt) \ |
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143 \ |
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144 /* If this class isn't present, it won't be referenced. */ \ |
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145 template(sun_misc_AtomicLongCSImpl_klass, sun_misc_AtomicLongCSImpl, Opt) \ |
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146 \ |
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147 template(sun_jkernel_DownloadManager_klass, sun_jkernel_DownloadManager, Opt_Kernel) \ |
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148 \ |
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149 /* Preload boxing klasses */ \ |
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150 template(boolean_klass, java_lang_Boolean, Pre) \ |
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151 template(char_klass, java_lang_Character, Pre) \ |
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152 template(float_klass, java_lang_Float, Pre) \ |
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153 template(double_klass, java_lang_Double, Pre) \ |
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154 template(byte_klass, java_lang_Byte, Pre) \ |
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155 template(short_klass, java_lang_Short, Pre) \ |
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156 template(int_klass, java_lang_Integer, Pre) \ |
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157 template(long_klass, java_lang_Long, Pre) \ |
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158 /*end*/ |
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159 |
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160 |
| 0 | 161 class SystemDictionary : AllStatic { |
| 162 friend class VMStructs; | |
| 163 friend class CompactingPermGenGen; | |
| 164 NOT_PRODUCT(friend class instanceKlassKlass;) | |
| 165 | |
| 166 public: | |
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167 enum WKID { |
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168 NO_WKID = 0, |
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169 |
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170 #define WK_KLASS_ENUM(name, ignore_s, ignore_o) WK_KLASS_ENUM_NAME(name), |
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171 WK_KLASSES_DO(WK_KLASS_ENUM) |
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172 #undef WK_KLASS_ENUM |
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173 |
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174 WKID_LIMIT, |
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175 |
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176 FIRST_WKID = NO_WKID + 1 |
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177 }; |
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178 |
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179 enum InitOption { |
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180 Pre, // preloaded; error if not present |
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181 |
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182 // Order is significant. Options before this point require resolve_or_fail. |
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183 // Options after this point will use resolve_or_null instead. |
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184 |
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185 Opt, // preload tried; NULL if not present |
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186 Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection |
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187 Opt_Only_JDK15, // preload tried; use only with JDK1.5+ |
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188 Opt_Kernel, // preload tried only #ifdef KERNEL |
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189 OPTION_LIMIT, |
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190 CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT) |
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191 }; |
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192 |
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193 |
| 0 | 194 // Returns a class with a given class name and class loader. Loads the |
| 195 // class if needed. If not found a NoClassDefFoundError or a | |
| 196 // ClassNotFoundException is thrown, depending on the value on the | |
| 197 // throw_error flag. For most uses the throw_error argument should be set | |
| 198 // to true. | |
| 199 | |
| 200 static klassOop resolve_or_fail(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS); | |
| 201 // Convenient call for null loader and protection domain. | |
| 202 static klassOop resolve_or_fail(symbolHandle class_name, bool throw_error, TRAPS); | |
| 203 private: | |
| 204 // handle error translation for resolve_or_null results | |
| 205 static klassOop handle_resolution_exception(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS); | |
| 206 | |
| 207 public: | |
| 208 | |
| 209 // Returns a class with a given class name and class loader. | |
| 210 // Loads the class if needed. If not found NULL is returned. | |
| 211 static klassOop resolve_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS); | |
| 212 // Version with null loader and protection domain | |
| 213 static klassOop resolve_or_null(symbolHandle class_name, TRAPS); | |
| 214 | |
| 215 // Resolve a superclass or superinterface. Called from ClassFileParser, | |
| 216 // parse_interfaces, resolve_instance_class_or_null, load_shared_class | |
| 217 // "child_name" is the class whose super class or interface is being resolved. | |
| 218 static klassOop resolve_super_or_fail(symbolHandle child_name, | |
| 219 symbolHandle class_name, | |
| 220 Handle class_loader, | |
| 221 Handle protection_domain, | |
| 222 bool is_superclass, | |
| 223 TRAPS); | |
| 224 | |
| 225 // Parse new stream. This won't update the system dictionary or | |
| 226 // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses. | |
| 227 static klassOop parse_stream(symbolHandle class_name, | |
| 228 Handle class_loader, | |
| 229 Handle protection_domain, | |
| 230 ClassFileStream* st, | |
| 231 TRAPS); | |
| 232 | |
| 233 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass) | |
| 234 static klassOop resolve_from_stream(symbolHandle class_name, Handle class_loader, Handle protection_domain, ClassFileStream* st, TRAPS); | |
| 235 | |
| 236 // Lookup an already loaded class. If not found NULL is returned. | |
| 237 static klassOop find(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS); | |
| 238 | |
| 239 // Lookup an already loaded instance or array class. | |
| 240 // Do not make any queries to class loaders; consult only the cache. | |
| 241 // If not found NULL is returned. | |
| 242 static klassOop find_instance_or_array_klass(symbolHandle class_name, | |
| 243 Handle class_loader, | |
| 244 Handle protection_domain, | |
| 245 TRAPS); | |
| 246 | |
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247 // If the given name is known to vmSymbols, return the well-know klass: |
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248 static klassOop find_well_known_klass(symbolOop class_name); |
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249 |
| 0 | 250 // Lookup an instance or array class that has already been loaded |
| 251 // either into the given class loader, or else into another class | |
| 252 // loader that is constrained (via loader constraints) to produce | |
| 253 // a consistent class. Do not take protection domains into account. | |
| 254 // Do not make any queries to class loaders; consult only the cache. | |
| 255 // Return NULL if the class is not found. | |
| 256 // | |
| 257 // This function is a strict superset of find_instance_or_array_klass. | |
| 258 // This function (the unchecked version) makes a conservative prediction | |
| 259 // of the result of the checked version, assuming successful lookup. | |
| 260 // If both functions return non-null, they must return the same value. | |
| 261 // Also, the unchecked version may sometimes be non-null where the | |
| 262 // checked version is null. This can occur in several ways: | |
| 263 // 1. No query has yet been made to the class loader. | |
| 264 // 2. The class loader was queried, but chose not to delegate. | |
| 265 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain. | |
| 266 // 4. Loading was attempted, but there was a linkage error of some sort. | |
| 267 // In all of these cases, the loader constraints on this type are | |
| 268 // satisfied, and it is safe for classes in the given class loader | |
| 269 // to manipulate strongly-typed values of the found class, subject | |
| 270 // to local linkage and access checks. | |
| 271 static klassOop find_constrained_instance_or_array_klass(symbolHandle class_name, | |
| 272 Handle class_loader, | |
| 273 TRAPS); | |
| 274 | |
| 275 // Iterate over all klasses in dictionary | |
| 276 // Just the classes from defining class loaders | |
| 277 static void classes_do(void f(klassOop)); | |
| 278 // Added for initialize_itable_for_klass to handle exceptions | |
| 279 static void classes_do(void f(klassOop, TRAPS), TRAPS); | |
| 280 // All classes, and their class loaders | |
| 281 static void classes_do(void f(klassOop, oop)); | |
| 282 // All classes, and their class loaders | |
| 283 // (added for helpers that use HandleMarks and ResourceMarks) | |
| 284 static void classes_do(void f(klassOop, oop, TRAPS), TRAPS); | |
| 285 // All entries in the placeholder table and their class loaders | |
| 286 static void placeholders_do(void f(symbolOop, oop)); | |
| 287 | |
| 288 // Iterate over all methods in all klasses in dictionary | |
| 289 static void methods_do(void f(methodOop)); | |
| 290 | |
| 291 // Garbage collection support | |
| 292 | |
| 293 // This method applies "blk->do_oop" to all the pointers to "system" | |
| 294 // classes and loaders. | |
| 295 static void always_strong_oops_do(OopClosure* blk); | |
| 296 static void always_strong_classes_do(OopClosure* blk); | |
| 297 // This method applies "blk->do_oop" to all the placeholders. | |
| 298 static void placeholders_do(OopClosure* blk); | |
| 299 | |
| 300 // Unload (that is, break root links to) all unmarked classes and | |
| 301 // loaders. Returns "true" iff something was unloaded. | |
| 302 static bool do_unloading(BoolObjectClosure* is_alive); | |
| 303 | |
| 304 // Applies "f->do_oop" to all root oops in the system dictionary. | |
| 305 static void oops_do(OopClosure* f); | |
| 306 | |
| 307 // System loader lock | |
| 308 static oop system_loader_lock() { return _system_loader_lock_obj; } | |
| 309 | |
| 310 private: | |
| 311 // Traverses preloaded oops: various system classes. These are | |
| 312 // guaranteed to be in the perm gen. | |
| 313 static void preloaded_oops_do(OopClosure* f); | |
| 314 static void lazily_loaded_oops_do(OopClosure* f); | |
| 315 | |
| 316 public: | |
| 317 // Sharing support. | |
| 318 static void reorder_dictionary(); | |
| 319 static void copy_buckets(char** top, char* end); | |
| 320 static void copy_table(char** top, char* end); | |
| 321 static void reverse(); | |
| 322 static void set_shared_dictionary(HashtableBucket* t, int length, | |
| 323 int number_of_entries); | |
| 324 // Printing | |
| 325 static void print() PRODUCT_RETURN; | |
| 326 static void print_class_statistics() PRODUCT_RETURN; | |
| 327 static void print_method_statistics() PRODUCT_RETURN; | |
| 328 | |
| 329 // Number of contained klasses | |
| 330 // This is both fully loaded classes and classes in the process | |
| 331 // of being loaded | |
| 332 static int number_of_classes(); | |
| 333 | |
| 334 // Monotonically increasing counter which grows as classes are | |
| 335 // loaded or modifications such as hot-swapping or setting/removing | |
| 336 // of breakpoints are performed | |
| 337 static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; } | |
| 338 // Needed by evolution and breakpoint code | |
| 339 static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; } | |
| 340 | |
| 341 // Verification | |
| 342 static void verify(); | |
| 343 | |
| 344 #ifdef ASSERT | |
| 345 static bool is_internal_format(symbolHandle class_name); | |
| 346 #endif | |
| 347 | |
| 348 // Verify class is in dictionary | |
| 349 static void verify_obj_klass_present(Handle obj, | |
| 350 symbolHandle class_name, | |
| 351 Handle class_loader); | |
| 352 | |
| 353 // Initialization | |
| 354 static void initialize(TRAPS); | |
| 355 | |
| 356 // Fast access to commonly used classes (preloaded) | |
| 357 static klassOop check_klass(klassOop k) { | |
| 358 assert(k != NULL, "preloaded klass not initialized"); | |
| 359 return k; | |
| 360 } | |
| 361 | |
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362 static klassOop check_klass_Pre(klassOop k) { return check_klass(k); } |
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363 static klassOop check_klass_Opt(klassOop k) { return k; } |
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364 static klassOop check_klass_Opt_Kernel(klassOop k) { return k; } //== Opt |
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365 static klassOop check_klass_Opt_Only_JDK15(klassOop k) { |
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366 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only"); |
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367 return k; |
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368 } |
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369 static klassOop check_klass_Opt_Only_JDK14NewRef(klassOop k) { |
| 0 | 370 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only"); |
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371 // despite the optional loading, if you use this it must be present: |
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372 return check_klass(k); |
| 0 | 373 } |
| 374 | |
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375 static bool initialize_wk_klass(WKID id, int init_opt, TRAPS); |
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376 static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS); |
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377 static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) { |
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378 int limit = (int)end_id + 1; |
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379 initialize_wk_klasses_until((WKID) limit, start_id, THREAD); |
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380 } |
| 0 | 381 |
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382 public: |
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383 #define WK_KLASS_DECLARE(name, ignore_symbol, option) \ |
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384 static klassOop name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } |
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385 WK_KLASSES_DO(WK_KLASS_DECLARE); |
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386 #undef WK_KLASS_DECLARE |
| 0 | 387 |
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388 // Local definition for direct access to the private array: |
| 147 | 389 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)] |
| 0 | 390 |
| 391 static klassOop box_klass(BasicType t) { | |
| 392 assert((uint)t < T_VOID+1, "range check"); | |
| 393 return check_klass(_box_klasses[t]); | |
| 394 } | |
| 395 static BasicType box_klass_type(klassOop k); // inverse of box_klass | |
| 396 | |
| 397 // methods returning lazily loaded klasses | |
| 398 // The corresponding method to load the class must be called before calling them. | |
| 399 static klassOop abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); } | |
| 400 | |
| 401 static void load_abstract_ownable_synchronizer_klass(TRAPS); | |
| 402 | |
| 403 private: | |
| 404 // Tells whether ClassLoader.loadClassInternal is present | |
| 405 static bool has_loadClassInternal() { return _has_loadClassInternal; } | |
| 406 | |
| 407 public: | |
| 408 // Tells whether ClassLoader.checkPackageAccess is present | |
| 409 static bool has_checkPackageAccess() { return _has_checkPackageAccess; } | |
| 410 | |
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411 static bool class_klass_loaded() { return WK_KLASS(class_klass) != NULL; } |
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412 static bool cloneable_klass_loaded() { return WK_KLASS(cloneable_klass) != NULL; } |
| 0 | 413 |
| 414 // Returns default system loader | |
| 415 static oop java_system_loader(); | |
| 416 | |
| 417 // Compute the default system loader | |
| 418 static void compute_java_system_loader(TRAPS); | |
| 419 | |
| 420 private: | |
| 421 // Mirrors for primitive classes (created eagerly) | |
| 422 static oop check_mirror(oop m) { | |
| 423 assert(m != NULL, "mirror not initialized"); | |
| 424 return m; | |
| 425 } | |
| 426 | |
| 427 public: | |
| 428 // Note: java_lang_Class::primitive_type is the inverse of java_mirror | |
| 429 | |
| 430 // Check class loader constraints | |
| 431 static bool add_loader_constraint(symbolHandle name, Handle loader1, | |
| 432 Handle loader2, TRAPS); | |
| 433 static char* check_signature_loaders(symbolHandle signature, Handle loader1, | |
| 434 Handle loader2, bool is_method, TRAPS); | |
| 435 | |
| 436 // Utility for printing loader "name" as part of tracing constraints | |
| 437 static const char* loader_name(oop loader) { | |
| 438 return ((loader) == NULL ? "<bootloader>" : | |
| 439 instanceKlass::cast((loader)->klass())->name()->as_C_string() ); | |
| 440 } | |
| 441 | |
| 442 // Record the error when the first attempt to resolve a reference from a constant | |
| 443 // pool entry to a class fails. | |
| 444 static void add_resolution_error(constantPoolHandle pool, int which, symbolHandle error); | |
| 445 static symbolOop find_resolution_error(constantPoolHandle pool, int which); | |
| 446 | |
| 447 private: | |
| 448 | |
| 449 enum Constants { | |
| 450 _loader_constraint_size = 107, // number of entries in constraint table | |
| 451 _resolution_error_size = 107, // number of entries in resolution error table | |
| 452 _nof_buckets = 1009 // number of buckets in hash table | |
| 453 }; | |
| 454 | |
| 455 | |
| 456 // Static variables | |
| 457 | |
| 458 // Hashtable holding loaded classes. | |
| 459 static Dictionary* _dictionary; | |
| 460 | |
| 461 // Hashtable holding placeholders for classes being loaded. | |
| 462 static PlaceholderTable* _placeholders; | |
| 463 | |
| 464 // Hashtable holding classes from the shared archive. | |
| 465 static Dictionary* _shared_dictionary; | |
| 466 | |
| 467 // Monotonically increasing counter which grows with | |
| 468 // _number_of_classes as well as hot-swapping and breakpoint setting | |
| 469 // and removal. | |
| 470 static int _number_of_modifications; | |
| 471 | |
| 472 // Lock object for system class loader | |
| 473 static oop _system_loader_lock_obj; | |
| 474 | |
| 475 // Constraints on class loaders | |
| 476 static LoaderConstraintTable* _loader_constraints; | |
| 477 | |
| 478 // Resolution errors | |
| 479 static ResolutionErrorTable* _resolution_errors; | |
| 480 | |
| 481 public: | |
| 482 // for VM_CounterDecay iteration support | |
| 483 friend class CounterDecay; | |
| 484 static klassOop try_get_next_class(); | |
| 485 | |
| 486 private: | |
| 487 static void validate_protection_domain(instanceKlassHandle klass, | |
| 488 Handle class_loader, | |
| 489 Handle protection_domain, TRAPS); | |
| 490 | |
| 491 friend class VM_PopulateDumpSharedSpace; | |
| 492 friend class TraversePlaceholdersClosure; | |
| 493 static Dictionary* dictionary() { return _dictionary; } | |
| 494 static Dictionary* shared_dictionary() { return _shared_dictionary; } | |
| 495 static PlaceholderTable* placeholders() { return _placeholders; } | |
| 496 static LoaderConstraintTable* constraints() { return _loader_constraints; } | |
| 497 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; } | |
| 498 | |
| 499 // Basic loading operations | |
| 500 static klassOop resolve_instance_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS); | |
| 501 static klassOop resolve_array_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS); | |
| 502 static instanceKlassHandle handle_parallel_super_load(symbolHandle class_name, symbolHandle supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS); | |
| 503 // Wait on SystemDictionary_lock; unlocks lockObject before | |
| 504 // waiting; relocks lockObject with correct recursion count | |
| 505 // after waiting, but before reentering SystemDictionary_lock | |
| 506 // to preserve lock order semantics. | |
| 507 static void double_lock_wait(Handle lockObject, TRAPS); | |
| 508 static void define_instance_class(instanceKlassHandle k, TRAPS); | |
| 509 static instanceKlassHandle find_or_define_instance_class(symbolHandle class_name, | |
| 510 Handle class_loader, | |
| 511 instanceKlassHandle k, TRAPS); | |
| 512 static instanceKlassHandle load_shared_class(symbolHandle class_name, | |
| 513 Handle class_loader, TRAPS); | |
| 514 static instanceKlassHandle load_shared_class(instanceKlassHandle ik, | |
| 515 Handle class_loader, TRAPS); | |
| 516 static instanceKlassHandle load_instance_class(symbolHandle class_name, Handle class_loader, TRAPS); | |
| 517 static Handle compute_loader_lock_object(Handle class_loader, TRAPS); | |
| 518 static void check_loader_lock_contention(Handle loader_lock, TRAPS); | |
| 519 | |
| 520 static klassOop find_shared_class(symbolHandle class_name); | |
| 521 | |
| 522 // Setup link to hierarchy | |
| 523 static void add_to_hierarchy(instanceKlassHandle k, TRAPS); | |
| 524 | |
| 525 private: | |
| 526 // We pass in the hashtable index so we can calculate it outside of | |
| 527 // the SystemDictionary_lock. | |
| 528 | |
| 529 // Basic find on loaded classes | |
| 530 static klassOop find_class(int index, unsigned int hash, | |
| 531 symbolHandle name, Handle loader); | |
| 532 | |
| 533 // Basic find on classes in the midst of being loaded | |
| 534 static symbolOop find_placeholder(int index, unsigned int hash, | |
| 535 symbolHandle name, Handle loader); | |
| 536 | |
| 537 // Basic find operation of loaded classes and classes in the midst | |
| 538 // of loading; used for assertions and verification only. | |
| 539 static oop find_class_or_placeholder(symbolHandle class_name, | |
| 540 Handle class_loader); | |
| 541 | |
| 542 // Updating entry in dictionary | |
| 543 // Add a completely loaded class | |
| 544 static void add_klass(int index, symbolHandle class_name, | |
| 545 Handle class_loader, KlassHandle obj); | |
| 546 | |
| 547 // Add a placeholder for a class being loaded | |
| 548 static void add_placeholder(int index, | |
| 549 symbolHandle class_name, | |
| 550 Handle class_loader); | |
| 551 static void remove_placeholder(int index, | |
| 552 symbolHandle class_name, | |
| 553 Handle class_loader); | |
| 554 | |
| 555 // Performs cleanups after resolve_super_or_fail. This typically needs | |
| 556 // to be called on failure. | |
| 557 // Won't throw, but can block. | |
| 558 static void resolution_cleanups(symbolHandle class_name, | |
| 559 Handle class_loader, | |
| 560 TRAPS); | |
| 561 | |
| 562 // Initialization | |
| 563 static void initialize_preloaded_classes(TRAPS); | |
| 564 | |
| 565 // Class loader constraints | |
| 566 static void check_constraints(int index, unsigned int hash, | |
| 567 instanceKlassHandle k, Handle loader, | |
| 568 bool defining, TRAPS); | |
| 569 static void update_dictionary(int d_index, unsigned int d_hash, | |
| 570 int p_index, unsigned int p_hash, | |
| 571 instanceKlassHandle k, Handle loader, TRAPS); | |
| 572 | |
| 573 // Variables holding commonly used klasses (preloaded) | |
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574 static klassOop _well_known_klasses[]; |
| 0 | 575 |
| 576 // Lazily loaded klasses | |
| 577 static volatile klassOop _abstract_ownable_synchronizer_klass; | |
| 578 | |
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579 // table of box klasses (int_klass, etc.) |
| 0 | 580 static klassOop _box_klasses[T_VOID+1]; |
| 581 | |
| 582 static oop _java_system_loader; | |
| 583 | |
| 584 static bool _has_loadClassInternal; | |
| 585 static bool _has_checkPackageAccess; | |
| 586 }; |