Mercurial > hg > truffle
annotate src/share/vm/classfile/systemDictionary.hpp @ 3028:1305cb3809c1
Performed folder and class name changes in native code.
| author | Thomas Wuerthinger <thomas@wuerthinger.net> |
|---|---|
| date | Mon, 20 Jun 2011 14:07:11 +0200 |
| parents | 66ecfc755c86 |
| children | 536528f48708 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP |
| 26 #define SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP | |
| 27 | |
| 28 #include "classfile/classFileStream.hpp" | |
| 29 #include "classfile/classLoader.hpp" | |
| 30 #include "oops/objArrayOop.hpp" | |
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31 #include "oops/symbol.hpp" |
| 1972 | 32 #include "runtime/java.hpp" |
| 33 #include "runtime/reflectionUtils.hpp" | |
| 34 #include "utilities/hashtable.hpp" | |
| 35 | |
| 0 | 36 // The system dictionary stores all loaded classes and maps: |
| 37 // | |
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38 // [class name,class loader] -> class i.e. [Symbol*,oop] -> klassOop |
| 0 | 39 // |
| 40 // Classes are loaded lazily. The default VM class loader is | |
| 41 // represented as NULL. | |
| 42 | |
| 43 // The underlying data structure is an open hash table with a fixed number | |
| 44 // of buckets. During loading the loader object is locked, (for the VM loader | |
| 45 // a private lock object is used). Class loading can thus be done concurrently, | |
| 46 // but only by different loaders. | |
| 47 // | |
| 48 // During loading a placeholder (name, loader) is temporarily placed in | |
| 49 // a side data structure, and is used to detect ClassCircularityErrors | |
| 50 // and to perform verification during GC. A GC can occur in the midst | |
| 51 // of class loading, as we call out to Java, have to take locks, etc. | |
| 52 // | |
| 53 // When class loading is finished, a new entry is added to the system | |
| 54 // dictionary and the place holder is removed. Note that the protection | |
| 55 // domain field of the system dictionary has not yet been filled in when | |
| 56 // the "real" system dictionary entry is created. | |
| 57 // | |
| 58 // Clients of this class who are interested in finding if a class has | |
| 59 // been completely loaded -- not classes in the process of being loaded -- | |
| 60 // can read the SystemDictionary unlocked. This is safe because | |
| 61 // - entries are only deleted at safepoints | |
| 62 // - readers cannot come to a safepoint while actively examining | |
| 63 // an entry (an entry cannot be deleted from under a reader) | |
| 64 // - entries must be fully formed before they are available to concurrent | |
| 65 // readers (we must ensure write ordering) | |
| 66 // | |
| 67 // Note that placeholders are deleted at any time, as they are removed | |
| 68 // when a class is completely loaded. Therefore, readers as well as writers | |
| 69 // of placeholders must hold the SystemDictionary_lock. | |
| 70 // | |
| 71 | |
| 72 class Dictionary; | |
| 73 class PlaceholderTable; | |
| 74 class LoaderConstraintTable; | |
| 75 class HashtableBucket; | |
| 76 class ResolutionErrorTable; | |
| 710 | 77 class SymbolPropertyTable; |
| 0 | 78 |
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79 // Certain classes are preloaded, such as java.lang.Object and java.lang.String. |
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80 // They are all "well-known", in the sense that no class loader is allowed |
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81 // to provide a different definition. |
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82 // |
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83 // These klasses must all have names defined in vmSymbols. |
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84 |
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85 #define WK_KLASS_ENUM_NAME(kname) kname##_knum |
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86 |
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87 // Each well-known class has a short klass name (like object_klass), |
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88 // a vmSymbol name (like java_lang_Object), and a flag word |
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89 // that makes some minor distinctions, like whether the klass |
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90 // is preloaded, optional, release-specific, etc. |
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91 // The order of these definitions is significant; it is the order in which |
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92 // preloading is actually performed by initialize_preloaded_classes. |
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93 |
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94 #define WK_KLASSES_DO(template) \ |
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95 /* well-known classes */ \ |
| 1142 | 96 template(Object_klass, java_lang_Object, Pre) \ |
| 97 template(String_klass, java_lang_String, Pre) \ | |
| 98 template(Class_klass, java_lang_Class, Pre) \ | |
| 99 template(Cloneable_klass, java_lang_Cloneable, Pre) \ | |
| 100 template(ClassLoader_klass, java_lang_ClassLoader, Pre) \ | |
| 101 template(Serializable_klass, java_io_Serializable, Pre) \ | |
| 102 template(System_klass, java_lang_System, Pre) \ | |
| 103 template(Throwable_klass, java_lang_Throwable, Pre) \ | |
| 104 template(Error_klass, java_lang_Error, Pre) \ | |
| 105 template(ThreadDeath_klass, java_lang_ThreadDeath, Pre) \ | |
| 106 template(Exception_klass, java_lang_Exception, Pre) \ | |
| 107 template(RuntimeException_klass, java_lang_RuntimeException, Pre) \ | |
| 108 template(ProtectionDomain_klass, java_security_ProtectionDomain, Pre) \ | |
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109 template(AccessControlContext_klass, java_security_AccessControlContext, Pre) \ |
| 1142 | 110 template(ClassNotFoundException_klass, java_lang_ClassNotFoundException, Pre) \ |
| 111 template(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre) \ | |
| 112 template(LinkageError_klass, java_lang_LinkageError, Pre) \ | |
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113 template(ClassCastException_klass, java_lang_ClassCastException, Pre) \ |
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114 template(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre) \ |
| 1142 | 115 template(VirtualMachineError_klass, java_lang_VirtualMachineError, Pre) \ |
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116 template(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre) \ |
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117 template(StackOverflowError_klass, java_lang_StackOverflowError, Pre) \ |
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118 template(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre) \ |
| 1142 | 119 template(Reference_klass, java_lang_ref_Reference, Pre) \ |
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120 \ |
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121 /* Preload ref klasses and set reference types */ \ |
| 1142 | 122 template(SoftReference_klass, java_lang_ref_SoftReference, Pre) \ |
| 123 template(WeakReference_klass, java_lang_ref_WeakReference, Pre) \ | |
| 124 template(FinalReference_klass, java_lang_ref_FinalReference, Pre) \ | |
| 125 template(PhantomReference_klass, java_lang_ref_PhantomReference, Pre) \ | |
| 126 template(Finalizer_klass, java_lang_ref_Finalizer, Pre) \ | |
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127 \ |
| 1142 | 128 template(Thread_klass, java_lang_Thread, Pre) \ |
| 129 template(ThreadGroup_klass, java_lang_ThreadGroup, Pre) \ | |
| 130 template(Properties_klass, java_util_Properties, Pre) \ | |
| 131 template(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject, Pre) \ | |
| 132 template(reflect_Field_klass, java_lang_reflect_Field, Pre) \ | |
| 133 template(reflect_Method_klass, java_lang_reflect_Method, Pre) \ | |
| 134 template(reflect_Constructor_klass, java_lang_reflect_Constructor, Pre) \ | |
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135 \ |
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136 /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \ |
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137 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \ |
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138 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \ |
| 1142 | 139 template(reflect_MagicAccessorImpl_klass, sun_reflect_MagicAccessorImpl, Opt) \ |
| 140 template(reflect_MethodAccessorImpl_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \ | |
| 141 template(reflect_ConstructorAccessorImpl_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \ | |
| 142 template(reflect_DelegatingClassLoader_klass, sun_reflect_DelegatingClassLoader, Opt) \ | |
| 143 template(reflect_ConstantPool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15) \ | |
| 144 template(reflect_UnsafeStaticFieldAccessorImpl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15) \ | |
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145 \ |
| 710 | 146 /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \ |
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147 template(MethodHandle_klass, java_lang_invoke_MethodHandle, Pre_JSR292) \ |
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148 template(MemberName_klass, java_lang_invoke_MemberName, Pre_JSR292) \ |
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149 template(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives, Pre_JSR292) \ |
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150 template(AdapterMethodHandle_klass, java_lang_invoke_AdapterMethodHandle, Pre_JSR292) \ |
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151 template(BoundMethodHandle_klass, java_lang_invoke_BoundMethodHandle, Pre_JSR292) \ |
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152 template(DirectMethodHandle_klass, java_lang_invoke_DirectMethodHandle, Pre_JSR292) \ |
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153 template(MethodType_klass, java_lang_invoke_MethodType, Pre_JSR292) \ |
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154 template(MethodTypeForm_klass, java_lang_invoke_MethodTypeForm, Pre_JSR292) \ |
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155 template(WrongMethodTypeException_klass, java_lang_invoke_WrongMethodTypeException, Pre_JSR292) \ |
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156 template(CallSite_klass, java_lang_invoke_CallSite, Pre_JSR292) \ |
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157 /* Note: MethodHandle must be first, and CallSite last in group */ \ |
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158 \ |
| 1142 | 159 template(StringBuffer_klass, java_lang_StringBuffer, Pre) \ |
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160 template(StringBuilder_klass, java_lang_StringBuilder, Pre) \ |
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161 \ |
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162 /* It's NULL in non-1.4 JDKs. */ \ |
| 1142 | 163 template(StackTraceElement_klass, java_lang_StackTraceElement, Opt) \ |
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164 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \ |
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165 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \ |
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166 template(java_nio_Buffer_klass, java_nio_Buffer, Opt) \ |
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167 \ |
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168 /* If this class isn't present, it won't be referenced. */ \ |
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169 template(sun_misc_AtomicLongCSImpl_klass, sun_misc_AtomicLongCSImpl, Opt) \ |
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170 \ |
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171 template(sun_jkernel_DownloadManager_klass, sun_jkernel_DownloadManager, Opt_Kernel) \ |
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172 \ |
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173 template(sun_misc_PostVMInitHook_klass, sun_misc_PostVMInitHook, Opt) \ |
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174 \ |
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175 /* Preload boxing klasses */ \ |
| 1142 | 176 template(Boolean_klass, java_lang_Boolean, Pre) \ |
| 177 template(Character_klass, java_lang_Character, Pre) \ | |
| 178 template(Float_klass, java_lang_Float, Pre) \ | |
| 179 template(Double_klass, java_lang_Double, Pre) \ | |
| 180 template(Byte_klass, java_lang_Byte, Pre) \ | |
| 181 template(Short_klass, java_lang_Short, Pre) \ | |
| 182 template(Integer_klass, java_lang_Integer, Pre) \ | |
| 183 template(Long_klass, java_lang_Long, Pre) \ | |
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184 \ |
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185 template(graalOptions_klass, com_sun_graal_graalOptions, Opt) \ |
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186 template(HotSpotTypeResolved_klass, com_sun_hotspot_graal_HotSpotTypeResolved, Opt) \ |
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187 template(HotSpotType_klass, com_sun_hotspot_graal_HotSpotType, Opt) \ |
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188 template(HotSpotField_klass, com_sun_hotspot_graal_HotSpotField, Opt) \ |
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189 template(HotSpotMethodResolved_klass, com_sun_hotspot_graal_HotSpotMethodResolved, Opt) \ |
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190 template(HotSpotTargetMethod_klass, com_sun_hotspot_graal_HotSpotTargetMethod, Opt) \ |
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191 template(HotSpotExceptionHandler_klass,com_sun_hotspot_graal_HotSpotExceptionHandler, Opt) \ |
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192 template(HotSpotProxy_klass, com_sun_hotspot_graal_HotSpotProxy, Opt) \ |
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193 template(CiAssumptions_klass, com_sun_cri_ci_CiAssumptions, Opt) \ |
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194 template(CiAssumptions_ConcreteSubtype_klass, com_sun_cri_ci_CiAssumptions_ConcreteSubtype, Opt) \ |
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195 template(CiAssumptions_ConcreteMethod_klass, com_sun_cri_ci_CiAssumptions_ConcreteMethod, Opt) \ |
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196 template(CiTargetMethod_klass, com_sun_cri_ci_CiTargetMethod, Opt) \ |
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197 template(CiTargetMethod_Site_klass, com_sun_cri_ci_CiTargetMethod_Site, Opt) \ |
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198 template(CiTargetMethod_Call_klass, com_sun_cri_ci_CiTargetMethod_Call, Opt) \ |
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199 template(CiTargetMethod_DataPatch_klass, com_sun_cri_ci_CiTargetMethod_DataPatch, Opt) \ |
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200 template(CiTargetMethod_Safepoint_klass, com_sun_cri_ci_CiTargetMethod_Safepoint, Opt) \ |
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201 template(CiTargetMethod_ExceptionHandler_klass, com_sun_cri_ci_CiTargetMethod_ExceptionHandler, Opt) \ |
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202 template(CiTargetMethod_Mark_klass, com_sun_cri_ci_CiTargetMethod_Mark, Opt) \ |
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203 template(GraalBitMap_klass, com_oracle_max_graal_graph_BitMap, Opt) \ |
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204 template(CiDebugInfo_klass, com_sun_cri_ci_CiDebugInfo, Opt) \ |
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205 template(CiFrame_klass, com_sun_cri_ci_CiFrame, Opt) \ |
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206 template(CiValue_klass, com_sun_cri_ci_CiValue, Opt) \ |
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207 template(CiStackSlot_klass, com_sun_cri_ci_CiStackSlot, Opt) \ |
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208 template(CiRegisterValue_klass, com_sun_cri_ci_CiRegisterValue, Opt) \ |
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209 template(CiRegister_klass, com_sun_cri_ci_CiRegister, Opt) \ |
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210 template(CiCodePos_klass, com_sun_cri_ci_CiCodePos, Opt) \ |
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211 template(CiConstant_klass, com_sun_cri_ci_CiConstant, Opt) \ |
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212 template(CiKind_klass, com_sun_cri_ci_CiKind, Opt) \ |
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213 template(CiRuntimeCall_klass, com_sun_cri_ci_CiRuntimeCall, Opt) \ |
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214 template(RiMethod_klass, com_sun_cri_ri_RiMethod, Opt) \ |
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215 template(RiType_klass, com_sun_cri_ri_RiType, Opt) \ |
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216 template(RiExceptionHandler_klass, com_sun_cri_ri_RiExceptionHandler, Opt) \ |
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217 template(RiTypeProfile_klass, com_sun_cri_ri_RiTypeProfile, Opt) \ |
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218 |
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219 /*end*/ |
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220 |
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221 |
| 0 | 222 class SystemDictionary : AllStatic { |
| 223 friend class VMStructs; | |
| 224 friend class CompactingPermGenGen; | |
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225 friend class SystemDictionaryHandles; |
| 0 | 226 NOT_PRODUCT(friend class instanceKlassKlass;) |
| 227 | |
| 228 public: | |
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229 enum WKID { |
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230 NO_WKID = 0, |
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231 |
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232 #define WK_KLASS_ENUM(name, ignore_s, ignore_o) WK_KLASS_ENUM_NAME(name), |
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233 WK_KLASSES_DO(WK_KLASS_ENUM) |
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234 #undef WK_KLASS_ENUM |
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235 |
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236 WKID_LIMIT, |
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237 |
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238 FIRST_WKID = NO_WKID + 1 |
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239 }; |
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240 |
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241 enum InitOption { |
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242 Pre, // preloaded; error if not present |
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243 Pre_JSR292, // preloaded if EnableInvokeDynamic |
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244 |
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245 // Order is significant. Options before this point require resolve_or_fail. |
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246 // Options after this point will use resolve_or_null instead. |
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247 |
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248 Opt, // preload tried; NULL if not present |
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249 Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection |
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250 Opt_Only_JDK15, // preload tried; use only with JDK1.5+ |
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251 Opt_Kernel, // preload tried only #ifdef KERNEL |
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252 OPTION_LIMIT, |
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253 CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT) |
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254 }; |
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255 |
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256 |
| 0 | 257 // Returns a class with a given class name and class loader. Loads the |
| 258 // class if needed. If not found a NoClassDefFoundError or a | |
| 259 // ClassNotFoundException is thrown, depending on the value on the | |
| 260 // throw_error flag. For most uses the throw_error argument should be set | |
| 261 // to true. | |
| 262 | |
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263 static klassOop resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS); |
| 0 | 264 // Convenient call for null loader and protection domain. |
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265 static klassOop resolve_or_fail(Symbol* class_name, bool throw_error, TRAPS); |
| 0 | 266 private: |
| 267 // handle error translation for resolve_or_null results | |
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268 static klassOop handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS); |
| 0 | 269 |
| 270 public: | |
| 271 | |
| 272 // Returns a class with a given class name and class loader. | |
| 273 // Loads the class if needed. If not found NULL is returned. | |
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274 static klassOop resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
| 0 | 275 // Version with null loader and protection domain |
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276 static klassOop resolve_or_null(Symbol* class_name, TRAPS); |
| 0 | 277 |
| 278 // Resolve a superclass or superinterface. Called from ClassFileParser, | |
| 279 // parse_interfaces, resolve_instance_class_or_null, load_shared_class | |
| 280 // "child_name" is the class whose super class or interface is being resolved. | |
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281 static klassOop resolve_super_or_fail(Symbol* child_name, |
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282 Symbol* class_name, |
| 0 | 283 Handle class_loader, |
| 284 Handle protection_domain, | |
| 285 bool is_superclass, | |
| 286 TRAPS); | |
| 287 | |
| 288 // Parse new stream. This won't update the system dictionary or | |
| 289 // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses. | |
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290 static klassOop parse_stream(Symbol* class_name, |
| 0 | 291 Handle class_loader, |
| 292 Handle protection_domain, | |
| 293 ClassFileStream* st, | |
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294 TRAPS) { |
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295 KlassHandle nullHandle; |
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296 return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD); |
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297 } |
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298 static klassOop parse_stream(Symbol* class_name, |
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299 Handle class_loader, |
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300 Handle protection_domain, |
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301 ClassFileStream* st, |
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302 KlassHandle host_klass, |
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303 GrowableArray<Handle>* cp_patches, |
| 0 | 304 TRAPS); |
| 305 | |
| 306 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass) | |
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307 static klassOop resolve_from_stream(Symbol* class_name, Handle class_loader, |
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308 Handle protection_domain, |
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309 ClassFileStream* st, bool verify, TRAPS); |
| 0 | 310 |
| 311 // Lookup an already loaded class. If not found NULL is returned. | |
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312 static klassOop find(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
| 0 | 313 |
| 314 // Lookup an already loaded instance or array class. | |
| 315 // Do not make any queries to class loaders; consult only the cache. | |
| 316 // If not found NULL is returned. | |
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317 static klassOop find_instance_or_array_klass(Symbol* class_name, |
| 0 | 318 Handle class_loader, |
| 319 Handle protection_domain, | |
| 320 TRAPS); | |
| 321 | |
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322 // If the given name is known to vmSymbols, return the well-know klass: |
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323 static klassOop find_well_known_klass(Symbol* class_name); |
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324 |
| 0 | 325 // Lookup an instance or array class that has already been loaded |
| 326 // either into the given class loader, or else into another class | |
| 327 // loader that is constrained (via loader constraints) to produce | |
| 328 // a consistent class. Do not take protection domains into account. | |
| 329 // Do not make any queries to class loaders; consult only the cache. | |
| 330 // Return NULL if the class is not found. | |
| 331 // | |
| 332 // This function is a strict superset of find_instance_or_array_klass. | |
| 333 // This function (the unchecked version) makes a conservative prediction | |
| 334 // of the result of the checked version, assuming successful lookup. | |
| 335 // If both functions return non-null, they must return the same value. | |
| 336 // Also, the unchecked version may sometimes be non-null where the | |
| 337 // checked version is null. This can occur in several ways: | |
| 338 // 1. No query has yet been made to the class loader. | |
| 339 // 2. The class loader was queried, but chose not to delegate. | |
| 340 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain. | |
| 341 // 4. Loading was attempted, but there was a linkage error of some sort. | |
| 342 // In all of these cases, the loader constraints on this type are | |
| 343 // satisfied, and it is safe for classes in the given class loader | |
| 344 // to manipulate strongly-typed values of the found class, subject | |
| 345 // to local linkage and access checks. | |
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346 static klassOop find_constrained_instance_or_array_klass(Symbol* class_name, |
| 0 | 347 Handle class_loader, |
| 348 TRAPS); | |
| 349 | |
| 350 // Iterate over all klasses in dictionary | |
| 351 // Just the classes from defining class loaders | |
| 352 static void classes_do(void f(klassOop)); | |
| 353 // Added for initialize_itable_for_klass to handle exceptions | |
| 354 static void classes_do(void f(klassOop, TRAPS), TRAPS); | |
| 355 // All classes, and their class loaders | |
| 356 static void classes_do(void f(klassOop, oop)); | |
| 357 // All classes, and their class loaders | |
| 358 // (added for helpers that use HandleMarks and ResourceMarks) | |
| 359 static void classes_do(void f(klassOop, oop, TRAPS), TRAPS); | |
| 360 // All entries in the placeholder table and their class loaders | |
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361 static void placeholders_do(void f(Symbol*, oop)); |
| 0 | 362 |
| 363 // Iterate over all methods in all klasses in dictionary | |
| 364 static void methods_do(void f(methodOop)); | |
| 365 | |
| 366 // Garbage collection support | |
| 367 | |
| 368 // This method applies "blk->do_oop" to all the pointers to "system" | |
| 369 // classes and loaders. | |
| 370 static void always_strong_oops_do(OopClosure* blk); | |
| 371 static void always_strong_classes_do(OopClosure* blk); | |
| 372 // This method applies "blk->do_oop" to all the placeholders. | |
| 373 static void placeholders_do(OopClosure* blk); | |
| 374 | |
| 375 // Unload (that is, break root links to) all unmarked classes and | |
| 376 // loaders. Returns "true" iff something was unloaded. | |
| 377 static bool do_unloading(BoolObjectClosure* is_alive); | |
| 378 | |
| 379 // Applies "f->do_oop" to all root oops in the system dictionary. | |
| 380 static void oops_do(OopClosure* f); | |
| 381 | |
| 382 // System loader lock | |
| 383 static oop system_loader_lock() { return _system_loader_lock_obj; } | |
| 384 | |
| 385 private: | |
| 386 // Traverses preloaded oops: various system classes. These are | |
| 387 // guaranteed to be in the perm gen. | |
| 388 static void preloaded_oops_do(OopClosure* f); | |
| 389 static void lazily_loaded_oops_do(OopClosure* f); | |
| 390 | |
| 391 public: | |
| 392 // Sharing support. | |
| 393 static void reorder_dictionary(); | |
| 394 static void copy_buckets(char** top, char* end); | |
| 395 static void copy_table(char** top, char* end); | |
| 396 static void reverse(); | |
| 397 static void set_shared_dictionary(HashtableBucket* t, int length, | |
| 398 int number_of_entries); | |
| 399 // Printing | |
| 400 static void print() PRODUCT_RETURN; | |
| 401 static void print_class_statistics() PRODUCT_RETURN; | |
| 402 static void print_method_statistics() PRODUCT_RETURN; | |
| 403 | |
| 404 // Number of contained klasses | |
| 405 // This is both fully loaded classes and classes in the process | |
| 406 // of being loaded | |
| 407 static int number_of_classes(); | |
| 408 | |
| 409 // Monotonically increasing counter which grows as classes are | |
| 410 // loaded or modifications such as hot-swapping or setting/removing | |
| 411 // of breakpoints are performed | |
| 412 static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; } | |
| 413 // Needed by evolution and breakpoint code | |
| 414 static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; } | |
| 415 | |
| 416 // Verification | |
| 417 static void verify(); | |
| 418 | |
| 419 #ifdef ASSERT | |
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420 static bool is_internal_format(Symbol* class_name); |
| 0 | 421 #endif |
| 422 | |
| 423 // Verify class is in dictionary | |
| 424 static void verify_obj_klass_present(Handle obj, | |
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425 Symbol* class_name, |
| 0 | 426 Handle class_loader); |
| 427 | |
| 428 // Initialization | |
| 429 static void initialize(TRAPS); | |
| 430 | |
| 431 // Fast access to commonly used classes (preloaded) | |
| 432 static klassOop check_klass(klassOop k) { | |
| 433 assert(k != NULL, "preloaded klass not initialized"); | |
| 434 return k; | |
| 435 } | |
| 436 | |
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437 static klassOop check_klass_Pre(klassOop k) { return check_klass(k); } |
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438 static klassOop check_klass_Pre_JSR292(klassOop k) { return EnableInvokeDynamic ? check_klass(k) : k; } |
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439 static klassOop check_klass_Opt(klassOop k) { return k; } |
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440 static klassOop check_klass_Opt_Kernel(klassOop k) { return k; } //== Opt |
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441 static klassOop check_klass_Opt_Only_JDK15(klassOop k) { |
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442 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only"); |
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443 return k; |
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444 } |
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445 static klassOop check_klass_Opt_Only_JDK14NewRef(klassOop k) { |
| 0 | 446 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only"); |
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447 // despite the optional loading, if you use this it must be present: |
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448 return check_klass(k); |
| 0 | 449 } |
| 450 | |
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451 static bool initialize_wk_klass(WKID id, int init_opt, TRAPS); |
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452 static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS); |
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453 static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) { |
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454 int limit = (int)end_id + 1; |
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455 initialize_wk_klasses_until((WKID) limit, start_id, THREAD); |
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456 } |
| 0 | 457 |
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458 public: |
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459 #define WK_KLASS_DECLARE(name, ignore_symbol, option) \ |
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460 static klassOop name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } |
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461 WK_KLASSES_DO(WK_KLASS_DECLARE); |
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462 #undef WK_KLASS_DECLARE |
| 0 | 463 |
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464 // Local definition for direct access to the private array: |
| 147 | 465 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)] |
| 0 | 466 |
| 467 static klassOop box_klass(BasicType t) { | |
| 468 assert((uint)t < T_VOID+1, "range check"); | |
| 469 return check_klass(_box_klasses[t]); | |
| 470 } | |
| 471 static BasicType box_klass_type(klassOop k); // inverse of box_klass | |
| 472 | |
| 473 // methods returning lazily loaded klasses | |
| 474 // The corresponding method to load the class must be called before calling them. | |
| 475 static klassOop abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); } | |
| 476 | |
| 477 static void load_abstract_ownable_synchronizer_klass(TRAPS); | |
| 478 | |
| 479 private: | |
| 480 // Tells whether ClassLoader.loadClassInternal is present | |
| 481 static bool has_loadClassInternal() { return _has_loadClassInternal; } | |
| 482 | |
| 483 public: | |
| 484 // Tells whether ClassLoader.checkPackageAccess is present | |
| 485 static bool has_checkPackageAccess() { return _has_checkPackageAccess; } | |
| 486 | |
| 1142 | 487 static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; } |
| 488 static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; } | |
| 0 | 489 |
| 490 // Returns default system loader | |
| 491 static oop java_system_loader(); | |
| 492 | |
| 493 // Compute the default system loader | |
| 494 static void compute_java_system_loader(TRAPS); | |
| 495 | |
| 496 private: | |
| 497 // Mirrors for primitive classes (created eagerly) | |
| 498 static oop check_mirror(oop m) { | |
| 499 assert(m != NULL, "mirror not initialized"); | |
| 500 return m; | |
| 501 } | |
| 502 | |
| 503 public: | |
| 504 // Note: java_lang_Class::primitive_type is the inverse of java_mirror | |
| 505 | |
| 506 // Check class loader constraints | |
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507 static bool add_loader_constraint(Symbol* name, Handle loader1, |
| 0 | 508 Handle loader2, TRAPS); |
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509 static char* check_signature_loaders(Symbol* signature, Handle loader1, |
| 0 | 510 Handle loader2, bool is_method, TRAPS); |
| 511 | |
| 710 | 512 // JSR 292 |
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513 // find the java.lang.invoke.MethodHandles::invoke method for a given signature |
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514 static methodOop find_method_handle_invoke(Symbol* name, |
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515 Symbol* signature, |
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516 KlassHandle accessing_klass, |
| 710 | 517 TRAPS); |
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518 // ask Java to compute a java.lang.invoke.MethodType object for a given signature |
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519 static Handle find_method_handle_type(Symbol* signature, |
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520 KlassHandle accessing_klass, |
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521 bool for_invokeGeneric, |
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522 bool& return_bcp_flag, |
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523 TRAPS); |
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524 // ask Java to compute a java.lang.invoke.MethodHandle object for a given CP entry |
| 1602 | 525 static Handle link_method_handle_constant(KlassHandle caller, |
| 526 int ref_kind, //e.g., JVM_REF_invokeVirtual | |
| 527 KlassHandle callee, | |
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528 Symbol* name, |
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529 Symbol* signature, |
| 1602 | 530 TRAPS); |
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531 // ask Java to create a dynamic call site, while linking an invokedynamic op |
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532 static Handle make_dynamic_call_site(Handle bootstrap_method, |
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533 // Callee information: |
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534 Symbol* name, |
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535 methodHandle signature_invoker, |
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536 Handle info, |
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537 // Caller information: |
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538 methodHandle caller_method, |
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539 int caller_bci, |
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540 TRAPS); |
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541 |
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542 // coordinate with Java about bootstrap methods |
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543 static Handle find_bootstrap_method(methodHandle caller_method, |
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544 int caller_bci, // N.B. must be an invokedynamic |
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545 int cache_index, // must be corresponding main_entry |
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546 Handle &argument_info_result, // static BSM arguments, if any |
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547 TRAPS); |
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548 |
| 0 | 549 // Utility for printing loader "name" as part of tracing constraints |
| 550 static const char* loader_name(oop loader) { | |
| 551 return ((loader) == NULL ? "<bootloader>" : | |
| 552 instanceKlass::cast((loader)->klass())->name()->as_C_string() ); | |
| 553 } | |
| 554 | |
| 555 // Record the error when the first attempt to resolve a reference from a constant | |
| 556 // pool entry to a class fails. | |
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557 static void add_resolution_error(constantPoolHandle pool, int which, Symbol* error); |
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558 static Symbol* find_resolution_error(constantPoolHandle pool, int which); |
| 0 | 559 |
| 560 private: | |
| 561 | |
| 562 enum Constants { | |
| 563 _loader_constraint_size = 107, // number of entries in constraint table | |
| 564 _resolution_error_size = 107, // number of entries in resolution error table | |
| 710 | 565 _invoke_method_size = 139, // number of entries in invoke method table |
| 0 | 566 _nof_buckets = 1009 // number of buckets in hash table |
| 567 }; | |
| 568 | |
| 569 | |
| 570 // Static variables | |
| 571 | |
| 572 // Hashtable holding loaded classes. | |
| 573 static Dictionary* _dictionary; | |
| 574 | |
| 575 // Hashtable holding placeholders for classes being loaded. | |
| 576 static PlaceholderTable* _placeholders; | |
| 577 | |
| 578 // Hashtable holding classes from the shared archive. | |
| 579 static Dictionary* _shared_dictionary; | |
| 580 | |
| 581 // Monotonically increasing counter which grows with | |
| 582 // _number_of_classes as well as hot-swapping and breakpoint setting | |
| 583 // and removal. | |
| 584 static int _number_of_modifications; | |
| 585 | |
| 586 // Lock object for system class loader | |
| 587 static oop _system_loader_lock_obj; | |
| 588 | |
| 589 // Constraints on class loaders | |
| 590 static LoaderConstraintTable* _loader_constraints; | |
| 591 | |
| 592 // Resolution errors | |
| 593 static ResolutionErrorTable* _resolution_errors; | |
| 594 | |
| 710 | 595 // Invoke methods (JSR 292) |
| 596 static SymbolPropertyTable* _invoke_method_table; | |
| 597 | |
| 0 | 598 public: |
| 599 // for VM_CounterDecay iteration support | |
| 600 friend class CounterDecay; | |
| 601 static klassOop try_get_next_class(); | |
| 602 | |
| 603 private: | |
| 604 static void validate_protection_domain(instanceKlassHandle klass, | |
| 605 Handle class_loader, | |
| 606 Handle protection_domain, TRAPS); | |
| 607 | |
| 608 friend class VM_PopulateDumpSharedSpace; | |
| 609 friend class TraversePlaceholdersClosure; | |
| 610 static Dictionary* dictionary() { return _dictionary; } | |
| 611 static Dictionary* shared_dictionary() { return _shared_dictionary; } | |
| 612 static PlaceholderTable* placeholders() { return _placeholders; } | |
| 613 static LoaderConstraintTable* constraints() { return _loader_constraints; } | |
| 614 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; } | |
| 710 | 615 static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; } |
| 0 | 616 |
| 617 // Basic loading operations | |
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618 static klassOop resolve_instance_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
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619 static klassOop resolve_array_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
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620 static instanceKlassHandle handle_parallel_super_load(Symbol* class_name, Symbol* supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS); |
| 0 | 621 // Wait on SystemDictionary_lock; unlocks lockObject before |
| 622 // waiting; relocks lockObject with correct recursion count | |
| 623 // after waiting, but before reentering SystemDictionary_lock | |
| 624 // to preserve lock order semantics. | |
| 625 static void double_lock_wait(Handle lockObject, TRAPS); | |
| 626 static void define_instance_class(instanceKlassHandle k, TRAPS); | |
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627 static instanceKlassHandle find_or_define_instance_class(Symbol* class_name, |
| 0 | 628 Handle class_loader, |
| 629 instanceKlassHandle k, TRAPS); | |
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630 static instanceKlassHandle load_shared_class(Symbol* class_name, |
| 0 | 631 Handle class_loader, TRAPS); |
| 632 static instanceKlassHandle load_shared_class(instanceKlassHandle ik, | |
| 633 Handle class_loader, TRAPS); | |
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634 static instanceKlassHandle load_instance_class(Symbol* class_name, Handle class_loader, TRAPS); |
| 0 | 635 static Handle compute_loader_lock_object(Handle class_loader, TRAPS); |
| 636 static void check_loader_lock_contention(Handle loader_lock, TRAPS); | |
| 514 | 637 static bool is_parallelCapable(Handle class_loader); |
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638 static bool is_parallelDefine(Handle class_loader); |
| 0 | 639 |
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640 static klassOop find_shared_class(Symbol* class_name); |
| 0 | 641 |
| 642 // Setup link to hierarchy | |
| 643 static void add_to_hierarchy(instanceKlassHandle k, TRAPS); | |
| 644 | |
| 645 private: | |
| 646 // We pass in the hashtable index so we can calculate it outside of | |
| 647 // the SystemDictionary_lock. | |
| 648 | |
| 649 // Basic find on loaded classes | |
| 650 static klassOop find_class(int index, unsigned int hash, | |
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651 Symbol* name, Handle loader); |
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652 static klassOop find_class(Symbol* class_name, Handle class_loader); |
| 0 | 653 |
| 654 // Basic find on classes in the midst of being loaded | |
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655 static Symbol* find_placeholder(Symbol* name, Handle loader); |
| 0 | 656 |
| 657 // Updating entry in dictionary | |
| 658 // Add a completely loaded class | |
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659 static void add_klass(int index, Symbol* class_name, |
| 0 | 660 Handle class_loader, KlassHandle obj); |
| 661 | |
| 662 // Add a placeholder for a class being loaded | |
| 663 static void add_placeholder(int index, | |
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664 Symbol* class_name, |
| 0 | 665 Handle class_loader); |
| 666 static void remove_placeholder(int index, | |
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667 Symbol* class_name, |
| 0 | 668 Handle class_loader); |
| 669 | |
| 670 // Performs cleanups after resolve_super_or_fail. This typically needs | |
| 671 // to be called on failure. | |
| 672 // Won't throw, but can block. | |
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673 static void resolution_cleanups(Symbol* class_name, |
| 0 | 674 Handle class_loader, |
| 675 TRAPS); | |
| 676 | |
| 677 // Initialization | |
| 678 static void initialize_preloaded_classes(TRAPS); | |
| 679 | |
| 680 // Class loader constraints | |
| 681 static void check_constraints(int index, unsigned int hash, | |
| 682 instanceKlassHandle k, Handle loader, | |
| 683 bool defining, TRAPS); | |
| 684 static void update_dictionary(int d_index, unsigned int d_hash, | |
| 685 int p_index, unsigned int p_hash, | |
| 686 instanceKlassHandle k, Handle loader, TRAPS); | |
| 687 | |
| 688 // Variables holding commonly used klasses (preloaded) | |
|
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689 static klassOop _well_known_klasses[]; |
| 0 | 690 |
| 691 // Lazily loaded klasses | |
| 692 static volatile klassOop _abstract_ownable_synchronizer_klass; | |
| 693 | |
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694 // table of box klasses (int_klass, etc.) |
| 0 | 695 static klassOop _box_klasses[T_VOID+1]; |
| 696 | |
| 697 static oop _java_system_loader; | |
| 698 | |
| 699 static bool _has_loadClassInternal; | |
| 700 static bool _has_checkPackageAccess; | |
| 701 }; | |
|
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702 |
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703 class SystemDictionaryHandles : AllStatic { |
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704 public: |
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705 #define WK_KLASS_HANDLE_DECLARE(name, ignore_symbol, option) \ |
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706 static KlassHandle name() { \ |
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707 SystemDictionary::name(); \ |
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708 klassOop* loc = &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \ |
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709 return KlassHandle(loc, true); \ |
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710 } |
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711 WK_KLASSES_DO(WK_KLASS_HANDLE_DECLARE); |
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712 #undef WK_KLASS_HANDLE_DECLARE |
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713 |
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714 static KlassHandle box_klass(BasicType t); |
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715 }; |
| 1972 | 716 |
| 717 #endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP |