Mercurial > hg > truffle
annotate src/share/vm/classfile/systemDictionary.hpp @ 6275:957c266d8bc5
Merge with http://hg.openjdk.java.net/hsx/hsx24/hotspot/
| author | Doug Simon <doug.simon@oracle.com> |
|---|---|
| date | Tue, 21 Aug 2012 10:39:19 +0200 |
| parents | 2585af1e26ac 1d7922586cf6 |
| children | 2a0c9f20baa1 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2012, 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" | |
| 6197 | 35 #include "utilities/hashtable.inline.hpp" |
| 1972 | 36 |
| 0 | 37 // The system dictionary stores all loaded classes and maps: |
| 38 // | |
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39 // [class name,class loader] -> class i.e. [Symbol*,oop] -> klassOop |
| 0 | 40 // |
| 41 // Classes are loaded lazily. The default VM class loader is | |
| 42 // represented as NULL. | |
| 43 | |
| 44 // The underlying data structure is an open hash table with a fixed number | |
| 45 // of buckets. During loading the loader object is locked, (for the VM loader | |
| 46 // a private lock object is used). Class loading can thus be done concurrently, | |
| 47 // but only by different loaders. | |
| 48 // | |
| 49 // During loading a placeholder (name, loader) is temporarily placed in | |
| 50 // a side data structure, and is used to detect ClassCircularityErrors | |
| 51 // and to perform verification during GC. A GC can occur in the midst | |
| 52 // of class loading, as we call out to Java, have to take locks, etc. | |
| 53 // | |
| 54 // When class loading is finished, a new entry is added to the system | |
| 55 // dictionary and the place holder is removed. Note that the protection | |
| 56 // domain field of the system dictionary has not yet been filled in when | |
| 57 // the "real" system dictionary entry is created. | |
| 58 // | |
| 59 // Clients of this class who are interested in finding if a class has | |
| 60 // been completely loaded -- not classes in the process of being loaded -- | |
| 61 // can read the SystemDictionary unlocked. This is safe because | |
| 62 // - entries are only deleted at safepoints | |
| 63 // - readers cannot come to a safepoint while actively examining | |
| 64 // an entry (an entry cannot be deleted from under a reader) | |
| 65 // - entries must be fully formed before they are available to concurrent | |
| 66 // readers (we must ensure write ordering) | |
| 67 // | |
| 68 // Note that placeholders are deleted at any time, as they are removed | |
| 69 // when a class is completely loaded. Therefore, readers as well as writers | |
| 70 // of placeholders must hold the SystemDictionary_lock. | |
| 71 // | |
| 72 | |
| 73 class Dictionary; | |
| 74 class PlaceholderTable; | |
| 75 class LoaderConstraintTable; | |
| 6197 | 76 template <MEMFLAGS F> class HashtableBucket; |
| 0 | 77 class ResolutionErrorTable; |
| 710 | 78 class SymbolPropertyTable; |
| 0 | 79 |
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80 // Certain classes are preloaded, such as java.lang.Object and java.lang.String. |
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81 // They are all "well-known", in the sense that no class loader is allowed |
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82 // to provide a different definition. |
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83 // |
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84 // These klasses must all have names defined in vmSymbols. |
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85 |
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86 #define WK_KLASS_ENUM_NAME(kname) kname##_knum |
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87 |
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88 // Each well-known class has a short klass name (like object_klass), |
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89 // a vmSymbol name (like java_lang_Object), and a flag word |
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90 // that makes some minor distinctions, like whether the klass |
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91 // is preloaded, optional, release-specific, etc. |
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92 // The order of these definitions is significant; it is the order in which |
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93 // preloading is actually performed by initialize_preloaded_classes. |
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94 |
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95 #define WK_KLASSES_DO(template) \ |
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96 /* well-known classes */ \ |
| 1142 | 97 template(Object_klass, java_lang_Object, Pre) \ |
| 98 template(String_klass, java_lang_String, Pre) \ | |
| 99 template(Class_klass, java_lang_Class, Pre) \ | |
| 100 template(Cloneable_klass, java_lang_Cloneable, Pre) \ | |
| 101 template(ClassLoader_klass, java_lang_ClassLoader, Pre) \ | |
| 102 template(Serializable_klass, java_io_Serializable, Pre) \ | |
| 103 template(System_klass, java_lang_System, Pre) \ | |
| 104 template(Throwable_klass, java_lang_Throwable, Pre) \ | |
| 105 template(Error_klass, java_lang_Error, Pre) \ | |
| 106 template(ThreadDeath_klass, java_lang_ThreadDeath, Pre) \ | |
| 107 template(Exception_klass, java_lang_Exception, Pre) \ | |
| 108 template(RuntimeException_klass, java_lang_RuntimeException, Pre) \ | |
| 109 template(ProtectionDomain_klass, java_security_ProtectionDomain, Pre) \ | |
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110 template(AccessControlContext_klass, java_security_AccessControlContext, Pre) \ |
| 1142 | 111 template(ClassNotFoundException_klass, java_lang_ClassNotFoundException, Pre) \ |
| 112 template(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre) \ | |
| 113 template(LinkageError_klass, java_lang_LinkageError, Pre) \ | |
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114 template(ClassCastException_klass, java_lang_ClassCastException, Pre) \ |
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115 template(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre) \ |
| 1142 | 116 template(VirtualMachineError_klass, java_lang_VirtualMachineError, Pre) \ |
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117 template(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre) \ |
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118 template(StackOverflowError_klass, java_lang_StackOverflowError, Pre) \ |
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119 template(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre) \ |
| 1142 | 120 template(Reference_klass, java_lang_ref_Reference, Pre) \ |
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121 \ |
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122 /* Preload ref klasses and set reference types */ \ |
| 1142 | 123 template(SoftReference_klass, java_lang_ref_SoftReference, Pre) \ |
| 124 template(WeakReference_klass, java_lang_ref_WeakReference, Pre) \ | |
| 125 template(FinalReference_klass, java_lang_ref_FinalReference, Pre) \ | |
| 126 template(PhantomReference_klass, java_lang_ref_PhantomReference, Pre) \ | |
| 127 template(Finalizer_klass, java_lang_ref_Finalizer, Pre) \ | |
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128 \ |
| 1142 | 129 template(Thread_klass, java_lang_Thread, Pre) \ |
| 130 template(ThreadGroup_klass, java_lang_ThreadGroup, Pre) \ | |
| 131 template(Properties_klass, java_util_Properties, Pre) \ | |
| 132 template(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject, Pre) \ | |
| 133 template(reflect_Field_klass, java_lang_reflect_Field, Pre) \ | |
| 134 template(reflect_Method_klass, java_lang_reflect_Method, Pre) \ | |
| 135 template(reflect_Constructor_klass, java_lang_reflect_Constructor, Pre) \ | |
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136 \ |
| 3938 | 137 /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \ |
| 138 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \ | |
| 139 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \ | |
| 140 template(reflect_MagicAccessorImpl_klass, sun_reflect_MagicAccessorImpl, Opt) \ | |
| 141 template(reflect_MethodAccessorImpl_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \ | |
| 142 template(reflect_ConstructorAccessorImpl_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \ | |
| 143 template(reflect_DelegatingClassLoader_klass, sun_reflect_DelegatingClassLoader, Opt) \ | |
| 144 template(reflect_ConstantPool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15) \ | |
| 145 template(reflect_UnsafeStaticFieldAccessorImpl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15) \ | |
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146 \ |
| 710 | 147 /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \ |
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148 template(MethodHandle_klass, java_lang_invoke_MethodHandle, Pre_JSR292) \ |
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149 template(MemberName_klass, java_lang_invoke_MemberName, Pre_JSR292) \ |
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150 template(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives, Pre_JSR292) \ |
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151 template(LambdaForm_klass, java_lang_invoke_LambdaForm, Opt) \ |
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152 template(MethodType_klass, java_lang_invoke_MethodType, Pre_JSR292) \ |
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153 template(BootstrapMethodError_klass, java_lang_BootstrapMethodError, Pre_JSR292) \ |
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154 template(CallSite_klass, java_lang_invoke_CallSite, Pre_JSR292) \ |
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155 template(ConstantCallSite_klass, java_lang_invoke_ConstantCallSite, Pre_JSR292) \ |
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156 template(MutableCallSite_klass, java_lang_invoke_MutableCallSite, Pre_JSR292) \ |
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157 template(VolatileCallSite_klass, java_lang_invoke_VolatileCallSite, Pre_JSR292) \ |
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158 /* Note: MethodHandle must be first, and VolatileCallSite last in group */ \ |
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159 \ |
| 1142 | 160 template(StringBuffer_klass, java_lang_StringBuffer, Pre) \ |
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161 template(StringBuilder_klass, java_lang_StringBuilder, Pre) \ |
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162 \ |
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163 /* It's NULL in non-1.4 JDKs. */ \ |
| 1142 | 164 template(StackTraceElement_klass, java_lang_StackTraceElement, Opt) \ |
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165 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \ |
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166 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \ |
| 3938 | 167 template(nio_Buffer_klass, java_nio_Buffer, Opt) \ |
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168 \ |
| 3938 | 169 template(DownloadManager_klass, sun_jkernel_DownloadManager, Opt_Kernel) \ |
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170 \ |
| 3938 | 171 template(PostVMInitHook_klass, sun_misc_PostVMInitHook, Opt) \ |
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172 \ |
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173 /* Preload boxing klasses */ \ |
| 1142 | 174 template(Boolean_klass, java_lang_Boolean, Pre) \ |
| 175 template(Character_klass, java_lang_Character, Pre) \ | |
| 176 template(Float_klass, java_lang_Float, Pre) \ | |
| 177 template(Double_klass, java_lang_Double, Pre) \ | |
| 178 template(Byte_klass, java_lang_Byte, Pre) \ | |
| 179 template(Short_klass, java_lang_Short, Pre) \ | |
| 180 template(Integer_klass, java_lang_Integer, Pre) \ | |
| 181 template(Long_klass, java_lang_Long, Pre) \ | |
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182 \ |
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183 /* Support for Graal */ \ |
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184 template(GraalBitMap_klass, java_util_BitSet, Opt) \ |
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185 /* graal.hotspot */ \ |
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186 template(HotSpotKlassOop_klass, com_oracle_graal_hotspot_HotSpotKlassOop, Opt) \ |
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187 template(HotSpotCompilationResult_klass, com_oracle_graal_hotspot_HotSpotCompilationResult, Opt) \ |
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188 template(HotSpotCodeInfo_klass, com_oracle_graal_hotspot_meta_HotSpotCodeInfo, Opt) \ |
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189 template(HotSpotCompiledMethod_klass, com_oracle_graal_hotspot_meta_HotSpotCompiledMethod, Opt) \ |
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190 template(HotSpotJavaType_klass, com_oracle_graal_hotspot_meta_HotSpotJavaType, Opt) \ |
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191 template(HotSpotMethodData_klass, com_oracle_graal_hotspot_meta_HotSpotMethodData, Opt) \ |
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192 template(HotSpotResolvedJavaField_klass, com_oracle_graal_hotspot_meta_HotSpotResolvedJavaField, Opt) \ |
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193 template(HotSpotResolvedJavaMethod_klass, com_oracle_graal_hotspot_meta_HotSpotResolvedJavaMethod, Opt) \ |
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194 template(HotSpotResolvedJavaType_klass, com_oracle_graal_hotspot_meta_HotSpotResolvedJavaType, Opt) \ |
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195 /* graal.api.code */ \ |
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196 template(Assumptions_klass, com_oracle_graal_api_code_Assumptions, Opt) \ |
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197 template(Assumptions_ConcreteMethod_klass, com_oracle_graal_api_code_Assumptions_ConcreteMethod, Opt) \ |
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198 template(Assumptions_ConcreteSubtype_klass, com_oracle_graal_api_code_Assumptions_ConcreteSubtype, Opt) \ |
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199 template(Assumptions_MethodContents_klass, com_oracle_graal_api_code_Assumptions_MethodContents, Opt) \ |
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200 template(BytecodePosition_klass, com_oracle_graal_api_code_BytecodePosition, Opt) \ |
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201 template(DebugInfo_klass, com_oracle_graal_api_code_DebugInfo, Opt) \ |
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202 template(BytecodeFrame_klass, com_oracle_graal_api_code_BytecodeFrame, Opt) \ |
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203 template(InstalledCode_klass, com_oracle_graal_api_code_InstalledCode, Opt) \ |
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204 template(InstalledCode_Call_klass, com_oracle_graal_api_code_InstalledCode_Call, Opt) \ |
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205 template(InstalledCode_DataPatch_klass, com_oracle_graal_api_code_InstalledCode_DataPatch, Opt) \ |
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206 template(InstalledCode_ExceptionHandler_klass, com_oracle_graal_api_code_InstalledCode_ExceptionHandler, Opt) \ |
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207 template(InstalledCode_Mark_klass, com_oracle_graal_api_code_InstalledCode_Mark, Opt) \ |
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208 template(InstalledCode_Safepoint_klass, com_oracle_graal_api_code_InstalledCode_Safepoint, Opt) \ |
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209 template(InstalledCode_Site_klass, com_oracle_graal_api_code_InstalledCode_Site, Opt) \ |
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210 template(code_MonitorValue_klass, com_oracle_graal_api_code_MonitorValue, Opt) \ |
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211 template(code_Register_klass, com_oracle_graal_api_code_Register, Opt) \ |
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212 template(RegisterValue_klass, com_oracle_graal_api_code_RegisterValue, Opt) \ |
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213 template(RuntimeCall_klass, com_oracle_graal_api_code_RuntimeCall, Opt) \ |
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214 template(StackSlot_klass, com_oracle_graal_api_code_StackSlot, Opt) \ |
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215 template(VirtualObject_klass, com_oracle_graal_api_code_VirtualObject, Opt) \ |
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216 /* graal.api.meta */ \ |
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217 template(Constant_klass, com_oracle_graal_api_meta_Constant, Opt) \ |
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218 template(ExceptionHandler_klass, com_oracle_graal_api_meta_ExceptionHandler, Opt) \ |
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219 template(Kind_klass, com_oracle_graal_api_meta_Kind, Opt) \ |
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220 template(JavaMethod_klass, com_oracle_graal_api_meta_JavaMethod, Opt) \ |
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221 template(JavaType_klass, com_oracle_graal_api_meta_JavaType, Opt) \ |
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222 template(ResolvedJavaField_klass, com_oracle_graal_api_meta_ResolvedJavaField, Opt) \ |
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223 template(Value_klass, com_oracle_graal_api_meta_Value, Opt) \ |
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224 /*end*/ |
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225 |
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226 |
| 0 | 227 class SystemDictionary : AllStatic { |
| 228 friend class VMStructs; | |
| 229 friend class CompactingPermGenGen; | |
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230 friend class SystemDictionaryHandles; |
| 0 | 231 NOT_PRODUCT(friend class instanceKlassKlass;) |
| 232 | |
| 233 public: | |
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234 enum WKID { |
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235 NO_WKID = 0, |
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236 |
| 3938 | 237 #define WK_KLASS_ENUM(name, symbol, ignore_o) WK_KLASS_ENUM_NAME(name), WK_KLASS_ENUM_NAME(symbol) = WK_KLASS_ENUM_NAME(name), |
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238 WK_KLASSES_DO(WK_KLASS_ENUM) |
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239 #undef WK_KLASS_ENUM |
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240 |
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241 WKID_LIMIT, |
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242 |
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243 FIRST_WKID = NO_WKID + 1 |
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244 }; |
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245 |
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246 enum InitOption { |
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247 Pre, // preloaded; error if not present |
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248 Pre_JSR292, // preloaded if EnableInvokeDynamic |
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249 |
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250 // Order is significant. Options before this point require resolve_or_fail. |
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251 // Options after this point will use resolve_or_null instead. |
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252 |
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253 Opt, // preload tried; NULL if not present |
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254 Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection |
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255 Opt_Only_JDK15, // preload tried; use only with JDK1.5+ |
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256 Opt_Kernel, // preload tried only #ifdef KERNEL |
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257 OPTION_LIMIT, |
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258 CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT) |
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259 }; |
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260 |
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261 |
| 0 | 262 // Returns a class with a given class name and class loader. Loads the |
| 263 // class if needed. If not found a NoClassDefFoundError or a | |
| 264 // ClassNotFoundException is thrown, depending on the value on the | |
| 265 // throw_error flag. For most uses the throw_error argument should be set | |
| 266 // to true. | |
| 267 | |
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268 static klassOop resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS); |
| 0 | 269 // Convenient call for null loader and protection domain. |
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270 static klassOop resolve_or_fail(Symbol* class_name, bool throw_error, TRAPS); |
| 0 | 271 private: |
| 272 // handle error translation for resolve_or_null results | |
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273 static klassOop handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS); |
| 0 | 274 |
| 275 public: | |
| 276 | |
| 277 // Returns a class with a given class name and class loader. | |
| 278 // Loads the class if needed. If not found NULL is returned. | |
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279 static klassOop resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
| 0 | 280 // Version with null loader and protection domain |
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281 static klassOop resolve_or_null(Symbol* class_name, TRAPS); |
| 0 | 282 |
| 283 // Resolve a superclass or superinterface. Called from ClassFileParser, | |
| 284 // parse_interfaces, resolve_instance_class_or_null, load_shared_class | |
| 285 // "child_name" is the class whose super class or interface is being resolved. | |
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286 static klassOop resolve_super_or_fail(Symbol* child_name, |
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287 Symbol* class_name, |
| 0 | 288 Handle class_loader, |
| 289 Handle protection_domain, | |
| 290 bool is_superclass, | |
| 291 TRAPS); | |
| 292 | |
| 293 // Parse new stream. This won't update the system dictionary or | |
| 294 // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses. | |
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295 static klassOop parse_stream(Symbol* class_name, |
| 0 | 296 Handle class_loader, |
| 297 Handle protection_domain, | |
| 298 ClassFileStream* st, | |
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299 TRAPS) { |
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300 KlassHandle nullHandle; |
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301 return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD); |
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302 } |
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303 static klassOop parse_stream(Symbol* class_name, |
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304 Handle class_loader, |
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305 Handle protection_domain, |
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306 ClassFileStream* st, |
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307 KlassHandle host_klass, |
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308 GrowableArray<Handle>* cp_patches, |
| 0 | 309 TRAPS); |
| 310 | |
| 311 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass) | |
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312 static klassOop resolve_from_stream(Symbol* class_name, Handle class_loader, |
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313 Handle protection_domain, |
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314 ClassFileStream* st, bool verify, TRAPS); |
| 0 | 315 |
| 316 // Lookup an already loaded class. If not found NULL is returned. | |
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317 static klassOop find(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
| 0 | 318 |
| 319 // Lookup an already loaded instance or array class. | |
| 320 // Do not make any queries to class loaders; consult only the cache. | |
| 321 // If not found NULL is returned. | |
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322 static klassOop find_instance_or_array_klass(Symbol* class_name, |
| 0 | 323 Handle class_loader, |
| 324 Handle protection_domain, | |
| 325 TRAPS); | |
| 326 | |
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327 // If the given name is known to vmSymbols, return the well-know klass: |
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328 static klassOop find_well_known_klass(Symbol* class_name); |
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329 |
| 0 | 330 // Lookup an instance or array class that has already been loaded |
| 331 // either into the given class loader, or else into another class | |
| 332 // loader that is constrained (via loader constraints) to produce | |
| 333 // a consistent class. Do not take protection domains into account. | |
| 334 // Do not make any queries to class loaders; consult only the cache. | |
| 335 // Return NULL if the class is not found. | |
| 336 // | |
| 337 // This function is a strict superset of find_instance_or_array_klass. | |
| 338 // This function (the unchecked version) makes a conservative prediction | |
| 339 // of the result of the checked version, assuming successful lookup. | |
| 340 // If both functions return non-null, they must return the same value. | |
| 341 // Also, the unchecked version may sometimes be non-null where the | |
| 342 // checked version is null. This can occur in several ways: | |
| 343 // 1. No query has yet been made to the class loader. | |
| 344 // 2. The class loader was queried, but chose not to delegate. | |
| 345 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain. | |
| 346 // 4. Loading was attempted, but there was a linkage error of some sort. | |
| 347 // In all of these cases, the loader constraints on this type are | |
| 348 // satisfied, and it is safe for classes in the given class loader | |
| 349 // to manipulate strongly-typed values of the found class, subject | |
| 350 // to local linkage and access checks. | |
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351 static klassOop find_constrained_instance_or_array_klass(Symbol* class_name, |
| 0 | 352 Handle class_loader, |
| 353 TRAPS); | |
| 354 | |
| 355 // Iterate over all klasses in dictionary | |
| 356 // Just the classes from defining class loaders | |
| 357 static void classes_do(void f(klassOop)); | |
| 358 // Added for initialize_itable_for_klass to handle exceptions | |
| 359 static void classes_do(void f(klassOop, TRAPS), TRAPS); | |
| 360 // All classes, and their class loaders | |
| 361 static void classes_do(void f(klassOop, oop)); | |
| 362 // All classes, and their class loaders | |
| 363 // (added for helpers that use HandleMarks and ResourceMarks) | |
| 364 static void classes_do(void f(klassOop, oop, TRAPS), TRAPS); | |
| 365 // All entries in the placeholder table and their class loaders | |
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366 static void placeholders_do(void f(Symbol*, oop)); |
| 0 | 367 |
| 368 // Iterate over all methods in all klasses in dictionary | |
| 369 static void methods_do(void f(methodOop)); | |
| 370 | |
| 371 // Garbage collection support | |
| 372 | |
| 373 // This method applies "blk->do_oop" to all the pointers to "system" | |
| 374 // classes and loaders. | |
| 375 static void always_strong_oops_do(OopClosure* blk); | |
| 376 static void always_strong_classes_do(OopClosure* blk); | |
| 377 // This method applies "blk->do_oop" to all the placeholders. | |
| 378 static void placeholders_do(OopClosure* blk); | |
| 379 | |
| 380 // Unload (that is, break root links to) all unmarked classes and | |
| 381 // loaders. Returns "true" iff something was unloaded. | |
| 382 static bool do_unloading(BoolObjectClosure* is_alive); | |
| 383 | |
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384 static int calculate_systemdictionary_size(int loadedclasses); |
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385 |
| 0 | 386 // Applies "f->do_oop" to all root oops in the system dictionary. |
| 387 static void oops_do(OopClosure* f); | |
| 388 | |
| 389 // System loader lock | |
| 390 static oop system_loader_lock() { return _system_loader_lock_obj; } | |
| 391 | |
| 392 private: | |
| 393 // Traverses preloaded oops: various system classes. These are | |
| 394 // guaranteed to be in the perm gen. | |
| 395 static void preloaded_oops_do(OopClosure* f); | |
| 396 static void lazily_loaded_oops_do(OopClosure* f); | |
| 397 | |
| 398 public: | |
| 399 // Sharing support. | |
| 400 static void reorder_dictionary(); | |
| 401 static void copy_buckets(char** top, char* end); | |
| 402 static void copy_table(char** top, char* end); | |
| 403 static void reverse(); | |
| 6197 | 404 static void set_shared_dictionary(HashtableBucket<mtClass>* t, int length, |
| 0 | 405 int number_of_entries); |
| 406 // Printing | |
| 407 static void print() PRODUCT_RETURN; | |
| 408 static void print_class_statistics() PRODUCT_RETURN; | |
| 409 static void print_method_statistics() PRODUCT_RETURN; | |
| 410 | |
| 411 // Number of contained klasses | |
| 412 // This is both fully loaded classes and classes in the process | |
| 413 // of being loaded | |
| 414 static int number_of_classes(); | |
| 415 | |
| 416 // Monotonically increasing counter which grows as classes are | |
| 417 // loaded or modifications such as hot-swapping or setting/removing | |
| 418 // of breakpoints are performed | |
| 419 static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; } | |
| 420 // Needed by evolution and breakpoint code | |
| 421 static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; } | |
| 422 | |
| 423 // Verification | |
| 424 static void verify(); | |
| 425 | |
| 426 #ifdef ASSERT | |
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427 static bool is_internal_format(Symbol* class_name); |
| 0 | 428 #endif |
| 429 | |
| 430 // Verify class is in dictionary | |
| 431 static void verify_obj_klass_present(Handle obj, | |
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432 Symbol* class_name, |
| 0 | 433 Handle class_loader); |
| 434 | |
| 435 // Initialization | |
| 436 static void initialize(TRAPS); | |
| 437 | |
| 438 // Fast access to commonly used classes (preloaded) | |
| 439 static klassOop check_klass(klassOop k) { | |
| 440 assert(k != NULL, "preloaded klass not initialized"); | |
| 441 return k; | |
| 442 } | |
| 443 | |
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444 static klassOop check_klass_Pre(klassOop k) { return check_klass(k); } |
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445 static klassOop check_klass_Pre_JSR292(klassOop k) { return EnableInvokeDynamic ? check_klass(k) : k; } |
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446 static klassOop check_klass_Opt(klassOop k) { return k; } |
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447 static klassOop check_klass_Opt_Kernel(klassOop k) { return k; } //== Opt |
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448 static klassOop check_klass_Opt_Only_JDK15(klassOop k) { |
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449 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only"); |
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450 return k; |
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451 } |
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452 static klassOop check_klass_Opt_Only_JDK14NewRef(klassOop k) { |
| 0 | 453 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only"); |
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454 // despite the optional loading, if you use this it must be present: |
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455 return check_klass(k); |
| 0 | 456 } |
| 457 | |
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458 static bool initialize_wk_klass(WKID id, int init_opt, TRAPS); |
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459 static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS); |
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460 static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) { |
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461 int limit = (int)end_id + 1; |
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462 initialize_wk_klasses_until((WKID) limit, start_id, THREAD); |
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463 } |
| 0 | 464 |
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465 public: |
| 3938 | 466 #define WK_KLASS_DECLARE(name, symbol, option) \ |
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467 static klassOop name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } |
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468 WK_KLASSES_DO(WK_KLASS_DECLARE); |
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469 #undef WK_KLASS_DECLARE |
| 0 | 470 |
| 3938 | 471 static klassOop well_known_klass(WKID id) { |
| 472 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); | |
| 473 return _well_known_klasses[id]; | |
| 474 } | |
| 475 | |
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476 // Local definition for direct access to the private array: |
| 147 | 477 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)] |
| 0 | 478 |
| 479 static klassOop box_klass(BasicType t) { | |
| 480 assert((uint)t < T_VOID+1, "range check"); | |
| 481 return check_klass(_box_klasses[t]); | |
| 482 } | |
| 483 static BasicType box_klass_type(klassOop k); // inverse of box_klass | |
| 484 | |
| 485 // methods returning lazily loaded klasses | |
| 486 // The corresponding method to load the class must be called before calling them. | |
| 487 static klassOop abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); } | |
| 488 | |
| 489 static void load_abstract_ownable_synchronizer_klass(TRAPS); | |
| 490 | |
| 491 private: | |
| 492 // Tells whether ClassLoader.loadClassInternal is present | |
| 493 static bool has_loadClassInternal() { return _has_loadClassInternal; } | |
| 494 | |
| 495 public: | |
| 496 // Tells whether ClassLoader.checkPackageAccess is present | |
| 497 static bool has_checkPackageAccess() { return _has_checkPackageAccess; } | |
| 498 | |
| 1142 | 499 static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; } |
| 500 static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; } | |
| 0 | 501 |
| 502 // Returns default system loader | |
| 503 static oop java_system_loader(); | |
| 504 | |
| 505 // Compute the default system loader | |
| 506 static void compute_java_system_loader(TRAPS); | |
| 507 | |
| 508 private: | |
| 509 // Mirrors for primitive classes (created eagerly) | |
| 510 static oop check_mirror(oop m) { | |
| 511 assert(m != NULL, "mirror not initialized"); | |
| 512 return m; | |
| 513 } | |
| 514 | |
| 515 public: | |
| 516 // Note: java_lang_Class::primitive_type is the inverse of java_mirror | |
| 517 | |
| 518 // Check class loader constraints | |
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519 static bool add_loader_constraint(Symbol* name, Handle loader1, |
| 0 | 520 Handle loader2, TRAPS); |
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521 static char* check_signature_loaders(Symbol* signature, Handle loader1, |
| 0 | 522 Handle loader2, bool is_method, TRAPS); |
| 523 | |
| 710 | 524 // JSR 292 |
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525 // find a java.lang.invoke.MethodHandle.invoke* method for a given signature |
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526 // (asks Java to compute it if necessary, except in a compiler thread) |
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527 static methodHandle find_method_handle_invoker(Symbol* name, |
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528 Symbol* signature, |
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529 KlassHandle accessing_klass, |
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530 Handle *appendix_result, |
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531 TRAPS); |
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532 // for a given signature, find the internal MethodHandle method (linkTo* or invokeBasic) |
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533 // (does not ask Java, since this is a low-level intrinsic defined by the JVM) |
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534 static methodHandle find_method_handle_intrinsic(vmIntrinsics::ID iid, |
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535 Symbol* signature, |
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536 TRAPS); |
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537 // find a java.lang.invoke.MethodType object for a given signature |
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538 // (asks Java to compute it if necessary, except in a compiler thread) |
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539 static Handle find_method_handle_type(Symbol* signature, |
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540 KlassHandle accessing_klass, |
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541 TRAPS); |
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542 |
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543 // ask Java to compute a java.lang.invoke.MethodHandle object for a given CP entry |
| 1602 | 544 static Handle link_method_handle_constant(KlassHandle caller, |
| 545 int ref_kind, //e.g., JVM_REF_invokeVirtual | |
| 546 KlassHandle callee, | |
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547 Symbol* name, |
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548 Symbol* signature, |
| 1602 | 549 TRAPS); |
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550 |
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551 // ask Java to create a dynamic call site, while linking an invokedynamic op |
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552 static methodHandle find_dynamic_call_site_invoker(KlassHandle caller, |
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553 Handle bootstrap_method, |
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554 Symbol* name, |
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555 Symbol* type, |
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556 Handle *appendix_result, |
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557 TRAPS); |
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558 |
| 0 | 559 // Utility for printing loader "name" as part of tracing constraints |
| 560 static const char* loader_name(oop loader) { | |
| 561 return ((loader) == NULL ? "<bootloader>" : | |
| 562 instanceKlass::cast((loader)->klass())->name()->as_C_string() ); | |
| 563 } | |
| 564 | |
| 565 // Record the error when the first attempt to resolve a reference from a constant | |
| 566 // pool entry to a class fails. | |
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567 static void add_resolution_error(constantPoolHandle pool, int which, Symbol* error); |
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568 static Symbol* find_resolution_error(constantPoolHandle pool, int which); |
| 0 | 569 |
| 570 private: | |
| 571 | |
| 572 enum Constants { | |
| 573 _loader_constraint_size = 107, // number of entries in constraint table | |
| 574 _resolution_error_size = 107, // number of entries in resolution error table | |
| 710 | 575 _invoke_method_size = 139, // number of entries in invoke method table |
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576 _nof_buckets = 1009, // number of buckets in hash table for placeholders |
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577 _old_default_sdsize = 1009, // backward compat for system dictionary size |
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578 _prime_array_size = 8, // array of primes for system dictionary size |
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579 _average_depth_goal = 3 // goal for lookup length |
| 0 | 580 }; |
| 581 | |
| 582 | |
| 583 // Static variables | |
| 584 | |
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585 // hashtable sizes for system dictionary to allow growth |
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586 // prime numbers for system dictionary size |
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587 static int _sdgeneration; |
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588 static const int _primelist[_prime_array_size]; |
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589 |
| 0 | 590 // Hashtable holding loaded classes. |
| 591 static Dictionary* _dictionary; | |
| 592 | |
| 593 // Hashtable holding placeholders for classes being loaded. | |
| 594 static PlaceholderTable* _placeholders; | |
| 595 | |
| 596 // Hashtable holding classes from the shared archive. | |
| 597 static Dictionary* _shared_dictionary; | |
| 598 | |
| 599 // Monotonically increasing counter which grows with | |
| 600 // _number_of_classes as well as hot-swapping and breakpoint setting | |
| 601 // and removal. | |
| 602 static int _number_of_modifications; | |
| 603 | |
| 604 // Lock object for system class loader | |
| 605 static oop _system_loader_lock_obj; | |
| 606 | |
| 607 // Constraints on class loaders | |
| 608 static LoaderConstraintTable* _loader_constraints; | |
| 609 | |
| 610 // Resolution errors | |
| 611 static ResolutionErrorTable* _resolution_errors; | |
| 612 | |
| 710 | 613 // Invoke methods (JSR 292) |
| 614 static SymbolPropertyTable* _invoke_method_table; | |
| 615 | |
| 0 | 616 public: |
| 617 // for VM_CounterDecay iteration support | |
| 618 friend class CounterDecay; | |
| 619 static klassOop try_get_next_class(); | |
| 620 | |
| 621 private: | |
| 622 static void validate_protection_domain(instanceKlassHandle klass, | |
| 623 Handle class_loader, | |
| 624 Handle protection_domain, TRAPS); | |
| 625 | |
| 626 friend class VM_PopulateDumpSharedSpace; | |
| 627 friend class TraversePlaceholdersClosure; | |
| 628 static Dictionary* dictionary() { return _dictionary; } | |
| 629 static Dictionary* shared_dictionary() { return _shared_dictionary; } | |
| 630 static PlaceholderTable* placeholders() { return _placeholders; } | |
| 631 static LoaderConstraintTable* constraints() { return _loader_constraints; } | |
| 632 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; } | |
| 710 | 633 static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; } |
| 0 | 634 |
| 635 // Basic loading operations | |
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636 static klassOop resolve_instance_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
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637 static klassOop resolve_array_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
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638 static instanceKlassHandle handle_parallel_super_load(Symbol* class_name, Symbol* supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS); |
| 0 | 639 // Wait on SystemDictionary_lock; unlocks lockObject before |
| 640 // waiting; relocks lockObject with correct recursion count | |
| 641 // after waiting, but before reentering SystemDictionary_lock | |
| 642 // to preserve lock order semantics. | |
| 643 static void double_lock_wait(Handle lockObject, TRAPS); | |
| 644 static void define_instance_class(instanceKlassHandle k, TRAPS); | |
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645 static instanceKlassHandle find_or_define_instance_class(Symbol* class_name, |
| 0 | 646 Handle class_loader, |
| 647 instanceKlassHandle k, TRAPS); | |
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648 static instanceKlassHandle load_shared_class(Symbol* class_name, |
| 0 | 649 Handle class_loader, TRAPS); |
| 650 static instanceKlassHandle load_shared_class(instanceKlassHandle ik, | |
| 651 Handle class_loader, TRAPS); | |
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652 static instanceKlassHandle load_instance_class(Symbol* class_name, Handle class_loader, TRAPS); |
| 0 | 653 static Handle compute_loader_lock_object(Handle class_loader, TRAPS); |
| 654 static void check_loader_lock_contention(Handle loader_lock, TRAPS); | |
| 514 | 655 static bool is_parallelCapable(Handle class_loader); |
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656 static bool is_parallelDefine(Handle class_loader); |
| 0 | 657 |
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658 static klassOop find_shared_class(Symbol* class_name); |
| 0 | 659 |
| 660 // Setup link to hierarchy | |
| 661 static void add_to_hierarchy(instanceKlassHandle k, TRAPS); | |
| 662 | |
| 663 private: | |
| 664 // We pass in the hashtable index so we can calculate it outside of | |
| 665 // the SystemDictionary_lock. | |
| 666 | |
| 667 // Basic find on loaded classes | |
| 668 static klassOop find_class(int index, unsigned int hash, | |
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669 Symbol* name, Handle loader); |
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670 static klassOop find_class(Symbol* class_name, Handle class_loader); |
| 0 | 671 |
| 672 // Basic find on classes in the midst of being loaded | |
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673 static Symbol* find_placeholder(Symbol* name, Handle loader); |
| 0 | 674 |
| 675 // Updating entry in dictionary | |
| 676 // Add a completely loaded class | |
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677 static void add_klass(int index, Symbol* class_name, |
| 0 | 678 Handle class_loader, KlassHandle obj); |
| 679 | |
| 680 // Add a placeholder for a class being loaded | |
| 681 static void add_placeholder(int index, | |
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682 Symbol* class_name, |
| 0 | 683 Handle class_loader); |
| 684 static void remove_placeholder(int index, | |
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685 Symbol* class_name, |
| 0 | 686 Handle class_loader); |
| 687 | |
| 688 // Performs cleanups after resolve_super_or_fail. This typically needs | |
| 689 // to be called on failure. | |
| 690 // Won't throw, but can block. | |
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691 static void resolution_cleanups(Symbol* class_name, |
| 0 | 692 Handle class_loader, |
| 693 TRAPS); | |
| 694 | |
| 695 // Initialization | |
| 696 static void initialize_preloaded_classes(TRAPS); | |
| 697 | |
| 698 // Class loader constraints | |
| 699 static void check_constraints(int index, unsigned int hash, | |
| 700 instanceKlassHandle k, Handle loader, | |
| 701 bool defining, TRAPS); | |
| 702 static void update_dictionary(int d_index, unsigned int d_hash, | |
| 703 int p_index, unsigned int p_hash, | |
| 704 instanceKlassHandle k, Handle loader, TRAPS); | |
| 705 | |
| 706 // Variables holding commonly used klasses (preloaded) | |
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707 static klassOop _well_known_klasses[]; |
| 0 | 708 |
| 709 // Lazily loaded klasses | |
| 710 static volatile klassOop _abstract_ownable_synchronizer_klass; | |
| 711 | |
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712 // table of box klasses (int_klass, etc.) |
| 0 | 713 static klassOop _box_klasses[T_VOID+1]; |
| 714 | |
| 715 static oop _java_system_loader; | |
| 716 | |
| 717 static bool _has_loadClassInternal; | |
| 718 static bool _has_checkPackageAccess; | |
| 719 }; | |
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720 |
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721 class SystemDictionaryHandles : AllStatic { |
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722 public: |
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723 #define WK_KLASS_HANDLE_DECLARE(name, ignore_symbol, option) \ |
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724 static KlassHandle name() { \ |
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725 SystemDictionary::name(); \ |
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726 klassOop* loc = &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \ |
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727 return KlassHandle(loc, true); \ |
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728 } |
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729 WK_KLASSES_DO(WK_KLASS_HANDLE_DECLARE); |
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730 #undef WK_KLASS_HANDLE_DECLARE |
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731 |
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732 static KlassHandle box_klass(BasicType t); |
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733 }; |
| 1972 | 734 |
| 735 #endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP |