Mercurial > hg > graal-compiler
annotate src/share/vm/classfile/systemDictionary.hpp @ 6948:e522a00b91aa
Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/ after NPG - C++ build works
| author | Doug Simon <doug.simon@oracle.com> |
|---|---|
| date | Mon, 12 Nov 2012 23:14:12 +0100 |
| parents | fd71ca8c5f88 4735d2c84362 |
| children | 41938af2b3d8 |
| 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] -> Klass* |
| 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(do_klass) \ |
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96 /* well-known classes */ \ |
| 6852 | 97 do_klass(Object_klass, java_lang_Object, Pre ) \ |
| 98 do_klass(String_klass, java_lang_String, Pre ) \ | |
| 99 do_klass(Class_klass, java_lang_Class, Pre ) \ | |
| 100 do_klass(Cloneable_klass, java_lang_Cloneable, Pre ) \ | |
| 101 do_klass(ClassLoader_klass, java_lang_ClassLoader, Pre ) \ | |
| 102 do_klass(Serializable_klass, java_io_Serializable, Pre ) \ | |
| 103 do_klass(System_klass, java_lang_System, Pre ) \ | |
| 104 do_klass(Throwable_klass, java_lang_Throwable, Pre ) \ | |
| 105 do_klass(Error_klass, java_lang_Error, Pre ) \ | |
| 106 do_klass(ThreadDeath_klass, java_lang_ThreadDeath, Pre ) \ | |
| 107 do_klass(Exception_klass, java_lang_Exception, Pre ) \ | |
| 108 do_klass(RuntimeException_klass, java_lang_RuntimeException, Pre ) \ | |
| 109 do_klass(ProtectionDomain_klass, java_security_ProtectionDomain, Pre ) \ | |
| 110 do_klass(AccessControlContext_klass, java_security_AccessControlContext, Pre ) \ | |
| 111 do_klass(ClassNotFoundException_klass, java_lang_ClassNotFoundException, Pre ) \ | |
| 112 do_klass(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre ) \ | |
| 113 do_klass(LinkageError_klass, java_lang_LinkageError, Pre ) \ | |
| 114 do_klass(ClassCastException_klass, java_lang_ClassCastException, Pre ) \ | |
| 115 do_klass(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre ) \ | |
| 116 do_klass(VirtualMachineError_klass, java_lang_VirtualMachineError, Pre ) \ | |
| 117 do_klass(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre ) \ | |
| 118 do_klass(StackOverflowError_klass, java_lang_StackOverflowError, Pre ) \ | |
| 119 do_klass(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre ) \ | |
| 120 do_klass(Reference_klass, java_lang_ref_Reference, Pre ) \ | |
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121 \ |
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122 /* Preload ref klasses and set reference types */ \ |
| 6852 | 123 do_klass(SoftReference_klass, java_lang_ref_SoftReference, Pre ) \ |
| 124 do_klass(WeakReference_klass, java_lang_ref_WeakReference, Pre ) \ | |
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125 do_klass(FinalReference_klass, java_lang_ref_FinalReference, Pre ) \ |
| 6852 | 126 do_klass(PhantomReference_klass, java_lang_ref_PhantomReference, Pre ) \ |
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127 do_klass(Finalizer_klass, java_lang_ref_Finalizer, Pre ) \ |
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128 \ |
| 6852 | 129 do_klass(Thread_klass, java_lang_Thread, Pre ) \ |
| 130 do_klass(ThreadGroup_klass, java_lang_ThreadGroup, Pre ) \ | |
| 131 do_klass(Properties_klass, java_util_Properties, Pre ) \ | |
| 132 do_klass(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject, Pre ) \ | |
| 133 do_klass(reflect_Field_klass, java_lang_reflect_Field, Pre ) \ | |
| 134 do_klass(reflect_Method_klass, java_lang_reflect_Method, Pre ) \ | |
| 135 do_klass(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. */ \ | |
| 6934 | 140 do_klass(lambda_MagicLambdaImpl_klass, java_lang_invoke_MagicLambdaImpl, Opt ) \ |
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141 do_klass(reflect_MagicAccessorImpl_klass, sun_reflect_MagicAccessorImpl, Opt ) \ |
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142 do_klass(reflect_MethodAccessorImpl_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \ |
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143 do_klass(reflect_ConstructorAccessorImpl_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \ |
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144 do_klass(reflect_DelegatingClassLoader_klass, sun_reflect_DelegatingClassLoader, Opt ) \ |
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145 do_klass(reflect_ConstantPool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15 ) \ |
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146 do_klass(reflect_UnsafeStaticFieldAccessorImpl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15 ) \ |
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147 \ |
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148 /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \ |
| 6852 | 149 do_klass(MethodHandle_klass, java_lang_invoke_MethodHandle, Pre_JSR292 ) \ |
| 150 do_klass(MemberName_klass, java_lang_invoke_MemberName, Pre_JSR292 ) \ | |
| 151 do_klass(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives, Pre_JSR292 ) \ | |
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152 do_klass(LambdaForm_klass, java_lang_invoke_LambdaForm, Opt ) \ |
| 6852 | 153 do_klass(MethodType_klass, java_lang_invoke_MethodType, Pre_JSR292 ) \ |
| 154 do_klass(BootstrapMethodError_klass, java_lang_BootstrapMethodError, Pre_JSR292 ) \ | |
| 155 do_klass(CallSite_klass, java_lang_invoke_CallSite, Pre_JSR292 ) \ | |
| 156 do_klass(ConstantCallSite_klass, java_lang_invoke_ConstantCallSite, Pre_JSR292 ) \ | |
| 157 do_klass(MutableCallSite_klass, java_lang_invoke_MutableCallSite, Pre_JSR292 ) \ | |
| 158 do_klass(VolatileCallSite_klass, java_lang_invoke_VolatileCallSite, Pre_JSR292 ) \ | |
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159 /* Note: MethodHandle must be first, and VolatileCallSite last in group */ \ |
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160 \ |
| 6852 | 161 do_klass(StringBuffer_klass, java_lang_StringBuffer, Pre ) \ |
| 162 do_klass(StringBuilder_klass, java_lang_StringBuilder, Pre ) \ | |
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163 \ |
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164 /* It's NULL in non-1.4 JDKs. */ \ |
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165 do_klass(StackTraceElement_klass, java_lang_StackTraceElement, Opt ) \ |
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166 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \ |
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167 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \ |
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168 do_klass(nio_Buffer_klass, java_nio_Buffer, Opt ) \ |
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169 \ |
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170 do_klass(DownloadManager_klass, sun_jkernel_DownloadManager, Opt_Kernel ) \ |
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171 \ |
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172 do_klass(PostVMInitHook_klass, sun_misc_PostVMInitHook, Opt ) \ |
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173 \ |
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174 /* Preload boxing klasses */ \ |
| 6852 | 175 do_klass(Boolean_klass, java_lang_Boolean, Pre ) \ |
| 176 do_klass(Character_klass, java_lang_Character, Pre ) \ | |
| 177 do_klass(Float_klass, java_lang_Float, Pre ) \ | |
| 178 do_klass(Double_klass, java_lang_Double, Pre ) \ | |
| 179 do_klass(Byte_klass, java_lang_Byte, Pre ) \ | |
| 180 do_klass(Short_klass, java_lang_Short, Pre ) \ | |
| 181 do_klass(Integer_klass, java_lang_Integer, Pre ) \ | |
| 182 do_klass(Long_klass, java_lang_Long, Pre ) \ | |
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183 \ |
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184 /* Support for Graal */ \ |
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185 do_klass(GraalBitMap_klass, java_util_BitSet, Opt) \ |
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186 /* graal.hotspot */ \ |
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187 do_klass(HotSpotKlassOop_klass, com_oracle_graal_hotspot_HotSpotKlassOop, Opt) \ |
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188 do_klass(HotSpotCompilationResult_klass, com_oracle_graal_hotspot_HotSpotCompilationResult, Opt) \ |
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189 do_klass(HotSpotCodeInfo_klass, com_oracle_graal_hotspot_meta_HotSpotCodeInfo, Opt) \ |
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190 do_klass(HotSpotInstalledCode_klass, com_oracle_graal_hotspot_meta_HotSpotInstalledCode, Opt) \ |
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191 do_klass(HotSpotJavaType_klass, com_oracle_graal_hotspot_meta_HotSpotJavaType, Opt) \ |
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192 do_klass(HotSpotMethodData_klass, com_oracle_graal_hotspot_meta_HotSpotMethodData, Opt) \ |
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193 do_klass(HotSpotResolvedJavaField_klass, com_oracle_graal_hotspot_meta_HotSpotResolvedJavaField, Opt) \ |
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194 do_klass(HotSpotResolvedJavaMethod_klass, com_oracle_graal_hotspot_meta_HotSpotResolvedJavaMethod, Opt) \ |
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195 do_klass(HotSpotResolvedJavaType_klass, com_oracle_graal_hotspot_meta_HotSpotResolvedJavaType, Opt) \ |
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196 /* graal.api.code */ \ |
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197 do_klass(Assumptions_klass, com_oracle_graal_api_code_Assumptions, Opt) \ |
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198 do_klass(Assumptions_ConcreteMethod_klass, com_oracle_graal_api_code_Assumptions_ConcreteMethod, Opt) \ |
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199 do_klass(Assumptions_ConcreteSubtype_klass, com_oracle_graal_api_code_Assumptions_ConcreteSubtype, Opt) \ |
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200 do_klass(Assumptions_MethodContents_klass, com_oracle_graal_api_code_Assumptions_MethodContents, Opt) \ |
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201 do_klass(BytecodePosition_klass, com_oracle_graal_api_code_BytecodePosition, Opt) \ |
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202 do_klass(DebugInfo_klass, com_oracle_graal_api_code_DebugInfo, Opt) \ |
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203 do_klass(BytecodeFrame_klass, com_oracle_graal_api_code_BytecodeFrame, Opt) \ |
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204 do_klass(CompilationResult_klass, com_oracle_graal_api_code_CompilationResult, Opt) \ |
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205 do_klass(CompilationResult_Call_klass, com_oracle_graal_api_code_CompilationResult_Call, Opt) \ |
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206 do_klass(CompilationResult_DataPatch_klass, com_oracle_graal_api_code_CompilationResult_DataPatch, Opt) \ |
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207 do_klass(CompilationResult_ExceptionHandler_klass, com_oracle_graal_api_code_CompilationResult_ExceptionHandler, Opt) \ |
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208 do_klass(CompilationResult_Mark_klass, com_oracle_graal_api_code_CompilationResult_Mark, Opt) \ |
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209 do_klass(CompilationResult_Safepoint_klass, com_oracle_graal_api_code_CompilationResult_Safepoint, Opt) \ |
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210 do_klass(CompilationResult_Site_klass, com_oracle_graal_api_code_CompilationResult_Site, Opt) \ |
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211 do_klass(code_MonitorValue_klass, com_oracle_graal_api_code_MonitorValue, Opt) \ |
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212 do_klass(code_Register_klass, com_oracle_graal_api_code_Register, Opt) \ |
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213 do_klass(RegisterValue_klass, com_oracle_graal_api_code_RegisterValue, Opt) \ |
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214 do_klass(StackSlot_klass, com_oracle_graal_api_code_StackSlot, Opt) \ |
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215 do_klass(VirtualObject_klass, com_oracle_graal_api_code_VirtualObject, Opt) \ |
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216 /* graal.api.meta */ \ |
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217 do_klass(Constant_klass, com_oracle_graal_api_meta_Constant, Opt) \ |
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218 do_klass(ExceptionHandler_klass, com_oracle_graal_api_meta_ExceptionHandler, Opt) \ |
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219 do_klass(Kind_klass, com_oracle_graal_api_meta_Kind, Opt) \ |
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220 do_klass(JavaMethod_klass, com_oracle_graal_api_meta_JavaMethod, Opt) \ |
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221 do_klass(JavaType_klass, com_oracle_graal_api_meta_JavaType, Opt) \ |
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222 do_klass(Value_klass, com_oracle_graal_api_meta_Value, Opt) \ |
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223 |
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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; | |
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229 friend class SystemDictionaryHandles; |
| 0 | 230 |
| 231 public: | |
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232 enum WKID { |
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233 NO_WKID = 0, |
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234 |
| 3938 | 235 #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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236 WK_KLASSES_DO(WK_KLASS_ENUM) |
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237 #undef WK_KLASS_ENUM |
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238 |
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239 WKID_LIMIT, |
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240 |
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241 FIRST_WKID = NO_WKID + 1 |
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242 }; |
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243 |
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244 enum InitOption { |
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245 Pre, // preloaded; error if not present |
| 6852 | 246 Pre_JSR292, // preloaded if EnableInvokeDynamic |
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247 |
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248 // Order is significant. Options before this point require resolve_or_fail. |
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249 // Options after this point will use resolve_or_null instead. |
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250 |
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251 Opt, // preload tried; NULL if not present |
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252 Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection |
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253 Opt_Only_JDK15, // preload tried; use only with JDK1.5+ |
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254 Opt_Kernel, // preload tried only #ifdef KERNEL |
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255 OPTION_LIMIT, |
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256 CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT) |
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257 }; |
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258 |
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259 |
| 0 | 260 // Returns a class with a given class name and class loader. Loads the |
| 261 // class if needed. If not found a NoClassDefFoundError or a | |
| 262 // ClassNotFoundException is thrown, depending on the value on the | |
| 263 // throw_error flag. For most uses the throw_error argument should be set | |
| 264 // to true. | |
| 265 | |
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266 static Klass* resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS); |
| 0 | 267 // Convenient call for null loader and protection domain. |
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268 static Klass* resolve_or_fail(Symbol* class_name, bool throw_error, TRAPS); |
| 0 | 269 private: |
| 270 // handle error translation for resolve_or_null results | |
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271 static Klass* handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS); |
| 0 | 272 |
| 273 public: | |
| 274 | |
| 275 // Returns a class with a given class name and class loader. | |
| 276 // Loads the class if needed. If not found NULL is returned. | |
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277 static Klass* resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
| 0 | 278 // Version with null loader and protection domain |
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279 static Klass* resolve_or_null(Symbol* class_name, TRAPS); |
| 0 | 280 |
| 281 // Resolve a superclass or superinterface. Called from ClassFileParser, | |
| 282 // parse_interfaces, resolve_instance_class_or_null, load_shared_class | |
| 283 // "child_name" is the class whose super class or interface is being resolved. | |
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284 static Klass* resolve_super_or_fail(Symbol* child_name, |
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285 Symbol* class_name, |
| 0 | 286 Handle class_loader, |
| 287 Handle protection_domain, | |
| 288 bool is_superclass, | |
| 289 TRAPS); | |
| 290 | |
| 291 // Parse new stream. This won't update the system dictionary or | |
| 292 // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses. | |
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293 static Klass* parse_stream(Symbol* class_name, |
| 0 | 294 Handle class_loader, |
| 295 Handle protection_domain, | |
| 296 ClassFileStream* st, | |
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297 TRAPS) { |
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298 KlassHandle nullHandle; |
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299 return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD); |
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300 } |
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301 static Klass* parse_stream(Symbol* class_name, |
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302 Handle class_loader, |
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303 Handle protection_domain, |
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304 ClassFileStream* st, |
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305 KlassHandle host_klass, |
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306 GrowableArray<Handle>* cp_patches, |
| 0 | 307 TRAPS); |
| 308 | |
| 309 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass) | |
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310 static Klass* resolve_from_stream(Symbol* class_name, Handle class_loader, |
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311 Handle protection_domain, |
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312 ClassFileStream* st, bool verify, TRAPS); |
| 0 | 313 |
| 314 // Lookup an already loaded class. If not found NULL is returned. | |
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315 static Klass* find(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
| 0 | 316 |
| 317 // Lookup an already loaded instance or array class. | |
| 318 // Do not make any queries to class loaders; consult only the cache. | |
| 319 // If not found NULL is returned. | |
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320 static Klass* find_instance_or_array_klass(Symbol* class_name, |
| 0 | 321 Handle class_loader, |
| 322 Handle protection_domain, | |
| 323 TRAPS); | |
| 324 | |
| 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 Klass* 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 | |
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352 static void classes_do(void f(Klass*)); |
| 0 | 353 // Added for initialize_itable_for_klass to handle exceptions |
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354 static void classes_do(void f(Klass*, TRAPS), TRAPS); |
| 0 | 355 // All classes, and their class loaders |
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356 static void classes_do(void f(Klass*, ClassLoaderData*)); |
| 0 | 357 // All classes, and their class loaders |
| 358 // (added for helpers that use HandleMarks and ResourceMarks) | |
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359 static void classes_do(void f(Klass*, ClassLoaderData*, TRAPS), TRAPS); |
| 0 | 360 // All entries in the placeholder table and their class loaders |
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361 static void placeholders_do(void f(Symbol*)); |
| 0 | 362 |
| 363 // Iterate over all methods in all klasses in dictionary | |
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364 static void methods_do(void f(Method*)); |
| 0 | 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); | |
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371 static void always_strong_classes_do(KlassClosure* closure); |
| 0 | 372 |
| 373 // Unload (that is, break root links to) all unmarked classes and | |
| 374 // loaders. Returns "true" iff something was unloaded. | |
| 375 static bool do_unloading(BoolObjectClosure* is_alive); | |
| 376 | |
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377 static int calculate_systemdictionary_size(int loadedclasses); |
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378 |
| 0 | 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: | |
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386 // Extended Redefine classes support (tbi) |
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387 static void preloaded_classes_do(KlassClosure* f); |
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388 static void lazily_loaded_classes_do(KlassClosure* f); |
| 0 | 389 public: |
| 390 // Sharing support. | |
| 391 static void reorder_dictionary(); | |
| 392 static void copy_buckets(char** top, char* end); | |
| 393 static void copy_table(char** top, char* end); | |
| 394 static void reverse(); | |
| 6197 | 395 static void set_shared_dictionary(HashtableBucket<mtClass>* t, int length, |
| 0 | 396 int number_of_entries); |
| 397 // Printing | |
| 398 static void print() PRODUCT_RETURN; | |
| 399 static void print_class_statistics() PRODUCT_RETURN; | |
| 400 static void print_method_statistics() PRODUCT_RETURN; | |
| 401 | |
| 402 // Number of contained klasses | |
| 403 // This is both fully loaded classes and classes in the process | |
| 404 // of being loaded | |
| 405 static int number_of_classes(); | |
| 406 | |
| 407 // Monotonically increasing counter which grows as classes are | |
| 408 // loaded or modifications such as hot-swapping or setting/removing | |
| 409 // of breakpoints are performed | |
| 410 static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; } | |
| 411 // Needed by evolution and breakpoint code | |
| 412 static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; } | |
| 413 | |
| 414 // Verification | |
| 415 static void verify(); | |
| 416 | |
| 417 #ifdef ASSERT | |
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418 static bool is_internal_format(Symbol* class_name); |
| 0 | 419 #endif |
| 420 | |
| 421 // Verify class is in dictionary | |
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422 static void verify_obj_klass_present(Symbol* class_name, |
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423 ClassLoaderData* loader_data); |
| 0 | 424 |
| 425 // Initialization | |
| 426 static void initialize(TRAPS); | |
| 427 | |
| 428 // Fast access to commonly used classes (preloaded) | |
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429 static Klass* check_klass(Klass* k) { |
| 0 | 430 assert(k != NULL, "preloaded klass not initialized"); |
| 431 return k; | |
| 432 } | |
| 433 | |
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434 static Klass* check_klass_Pre( Klass* k) { return check_klass(k); } |
| 6852 | 435 static Klass* check_klass_Pre_JSR292(Klass* k) { return EnableInvokeDynamic ? check_klass(k) : k; } |
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436 static Klass* check_klass_Opt( Klass* k) { return k; } |
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437 static Klass* check_klass_Opt_Kernel(Klass* k) { return k; } //== Opt |
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438 static Klass* check_klass_Opt_Only_JDK15(Klass* k) { |
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439 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only"); |
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440 return k; |
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441 } |
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442 static Klass* check_klass_Opt_Only_JDK14NewRef(Klass* k) { |
| 0 | 443 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only"); |
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444 // despite the optional loading, if you use this it must be present: |
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445 return check_klass(k); |
| 0 | 446 } |
| 447 | |
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448 static bool initialize_wk_klass(WKID id, int init_opt, TRAPS); |
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449 static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS); |
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450 static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) { |
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451 int limit = (int)end_id + 1; |
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452 initialize_wk_klasses_until((WKID) limit, start_id, THREAD); |
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453 } |
| 0 | 454 |
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455 public: |
| 3938 | 456 #define WK_KLASS_DECLARE(name, symbol, option) \ |
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457 static Klass* name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } \ |
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458 static Klass** name##_addr() { \ |
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459 return &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \ |
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460 } |
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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 static Klass* well_known_klass(WKID id) { |
| 3938 | 465 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
| 466 return _well_known_klasses[id]; | |
| 467 } | |
| 468 | |
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469 static Klass** well_known_klass_addr(WKID id) { |
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470 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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471 return &_well_known_klasses[id]; |
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472 } |
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473 |
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474 // Local definition for direct access to the private array: |
| 147 | 475 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)] |
| 0 | 476 |
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477 static Klass* box_klass(BasicType t) { |
| 0 | 478 assert((uint)t < T_VOID+1, "range check"); |
| 479 return check_klass(_box_klasses[t]); | |
| 480 } | |
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481 static BasicType box_klass_type(Klass* k); // inverse of box_klass |
| 0 | 482 |
| 483 // methods returning lazily loaded klasses | |
| 484 // The corresponding method to load the class must be called before calling them. | |
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485 static Klass* abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); } |
| 0 | 486 |
| 487 static void load_abstract_ownable_synchronizer_klass(TRAPS); | |
| 488 | |
| 489 private: | |
| 490 // Tells whether ClassLoader.loadClassInternal is present | |
| 491 static bool has_loadClassInternal() { return _has_loadClassInternal; } | |
| 492 | |
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493 // Returns the class loader data to be used when looking up/updating the |
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494 // system dictionary. |
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495 static ClassLoaderData *class_loader_data(Handle class_loader) { |
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496 return ClassLoaderData::class_loader_data(class_loader()); |
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497 } |
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498 |
| 0 | 499 public: |
| 500 // Tells whether ClassLoader.checkPackageAccess is present | |
| 501 static bool has_checkPackageAccess() { return _has_checkPackageAccess; } | |
| 502 | |
| 1142 | 503 static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; } |
| 504 static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; } | |
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505 static bool Object_klass_loaded() { return WK_KLASS(Object_klass) != NULL; } |
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506 static bool ClassLoader_klass_loaded() { return WK_KLASS(ClassLoader_klass) != NULL; } |
| 0 | 507 |
| 508 // Returns default system loader | |
| 509 static oop java_system_loader(); | |
| 510 | |
| 511 // Compute the default system loader | |
| 512 static void compute_java_system_loader(TRAPS); | |
| 513 | |
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514 // Register a new class loader |
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515 static ClassLoaderData* register_loader(Handle class_loader); |
| 0 | 516 private: |
| 517 // Mirrors for primitive classes (created eagerly) | |
| 518 static oop check_mirror(oop m) { | |
| 519 assert(m != NULL, "mirror not initialized"); | |
| 520 return m; | |
| 521 } | |
| 522 | |
| 523 public: | |
| 524 // Note: java_lang_Class::primitive_type is the inverse of java_mirror | |
| 525 | |
| 526 // Check class loader constraints | |
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527 static bool add_loader_constraint(Symbol* name, Handle loader1, |
| 0 | 528 Handle loader2, TRAPS); |
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529 static char* check_signature_loaders(Symbol* signature, Handle loader1, |
| 0 | 530 Handle loader2, bool is_method, TRAPS); |
| 531 | |
| 710 | 532 // JSR 292 |
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533 // find a java.lang.invoke.MethodHandle.invoke* method for a given signature |
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534 // (asks Java to compute it if necessary, except in a compiler thread) |
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535 static methodHandle find_method_handle_invoker(Symbol* name, |
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536 Symbol* signature, |
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537 KlassHandle accessing_klass, |
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538 Handle *appendix_result, |
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539 Handle *method_type_result, |
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540 TRAPS); |
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541 // for a given signature, find the internal MethodHandle method (linkTo* or invokeBasic) |
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542 // (does not ask Java, since this is a low-level intrinsic defined by the JVM) |
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543 static methodHandle find_method_handle_intrinsic(vmIntrinsics::ID iid, |
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544 Symbol* signature, |
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545 TRAPS); |
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546 // find a java.lang.invoke.MethodType object for a given signature |
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547 // (asks Java to compute it if necessary, except in a compiler thread) |
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548 static Handle find_method_handle_type(Symbol* signature, |
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549 KlassHandle accessing_klass, |
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550 TRAPS); |
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551 |
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552 // ask Java to compute a java.lang.invoke.MethodHandle object for a given CP entry |
| 1602 | 553 static Handle link_method_handle_constant(KlassHandle caller, |
| 554 int ref_kind, //e.g., JVM_REF_invokeVirtual | |
| 555 KlassHandle callee, | |
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556 Symbol* name, |
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557 Symbol* signature, |
| 1602 | 558 TRAPS); |
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559 |
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560 // ask Java to create a dynamic call site, while linking an invokedynamic op |
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561 static methodHandle find_dynamic_call_site_invoker(KlassHandle caller, |
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562 Handle bootstrap_method, |
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563 Symbol* name, |
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564 Symbol* type, |
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565 Handle *appendix_result, |
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566 Handle *method_type_result, |
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567 TRAPS); |
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568 |
| 0 | 569 // Utility for printing loader "name" as part of tracing constraints |
| 570 static const char* loader_name(oop loader) { | |
| 571 return ((loader) == NULL ? "<bootloader>" : | |
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572 InstanceKlass::cast((loader)->klass())->name()->as_C_string() ); |
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573 } |
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574 static const char* loader_name(ClassLoaderData* loader_data) { |
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575 return (loader_data->is_the_null_class_loader_data() ? "<bootloader>" : |
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576 InstanceKlass::cast((loader_data->class_loader())->klass())->name()->as_C_string() ); |
| 0 | 577 } |
| 578 | |
| 579 // Record the error when the first attempt to resolve a reference from a constant | |
| 580 // pool entry to a class fails. | |
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581 static void add_resolution_error(constantPoolHandle pool, int which, Symbol* error); |
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582 static void delete_resolution_error(ConstantPool* pool); |
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583 static Symbol* find_resolution_error(constantPoolHandle pool, int which); |
| 0 | 584 |
| 585 private: | |
| 586 | |
| 587 enum Constants { | |
| 588 _loader_constraint_size = 107, // number of entries in constraint table | |
| 589 _resolution_error_size = 107, // number of entries in resolution error table | |
| 710 | 590 _invoke_method_size = 139, // number of entries in invoke method table |
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591 _nof_buckets = 1009, // number of buckets in hash table for placeholders |
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592 _old_default_sdsize = 1009, // backward compat for system dictionary size |
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593 _prime_array_size = 8, // array of primes for system dictionary size |
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594 _average_depth_goal = 3 // goal for lookup length |
| 0 | 595 }; |
| 596 | |
| 597 | |
| 598 // Static variables | |
| 599 | |
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600 // hashtable sizes for system dictionary to allow growth |
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601 // prime numbers for system dictionary size |
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602 static int _sdgeneration; |
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603 static const int _primelist[_prime_array_size]; |
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604 |
| 0 | 605 // Hashtable holding loaded classes. |
| 606 static Dictionary* _dictionary; | |
| 607 | |
| 608 // Hashtable holding placeholders for classes being loaded. | |
| 609 static PlaceholderTable* _placeholders; | |
| 610 | |
| 611 // Hashtable holding classes from the shared archive. | |
| 612 static Dictionary* _shared_dictionary; | |
| 613 | |
| 614 // Monotonically increasing counter which grows with | |
| 615 // _number_of_classes as well as hot-swapping and breakpoint setting | |
| 616 // and removal. | |
| 617 static int _number_of_modifications; | |
| 618 | |
| 619 // Lock object for system class loader | |
| 620 static oop _system_loader_lock_obj; | |
| 621 | |
| 622 // Constraints on class loaders | |
| 623 static LoaderConstraintTable* _loader_constraints; | |
| 624 | |
| 625 // Resolution errors | |
| 626 static ResolutionErrorTable* _resolution_errors; | |
| 627 | |
| 710 | 628 // Invoke methods (JSR 292) |
| 629 static SymbolPropertyTable* _invoke_method_table; | |
| 630 | |
| 0 | 631 public: |
| 632 // for VM_CounterDecay iteration support | |
| 633 friend class CounterDecay; | |
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634 static Klass* try_get_next_class(); |
| 0 | 635 |
| 636 private: | |
| 637 static void validate_protection_domain(instanceKlassHandle klass, | |
| 638 Handle class_loader, | |
| 639 Handle protection_domain, TRAPS); | |
| 640 | |
| 641 friend class VM_PopulateDumpSharedSpace; | |
| 642 friend class TraversePlaceholdersClosure; | |
| 643 static Dictionary* dictionary() { return _dictionary; } | |
| 644 static Dictionary* shared_dictionary() { return _shared_dictionary; } | |
| 645 static PlaceholderTable* placeholders() { return _placeholders; } | |
| 646 static LoaderConstraintTable* constraints() { return _loader_constraints; } | |
| 647 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; } | |
| 710 | 648 static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; } |
| 0 | 649 |
| 650 // Basic loading operations | |
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651 static Klass* resolve_instance_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
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652 static Klass* resolve_array_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
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653 static instanceKlassHandle handle_parallel_super_load(Symbol* class_name, Symbol* supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS); |
| 0 | 654 // Wait on SystemDictionary_lock; unlocks lockObject before |
| 655 // waiting; relocks lockObject with correct recursion count | |
| 656 // after waiting, but before reentering SystemDictionary_lock | |
| 657 // to preserve lock order semantics. | |
| 658 static void double_lock_wait(Handle lockObject, TRAPS); | |
| 659 static void define_instance_class(instanceKlassHandle k, TRAPS); | |
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660 static instanceKlassHandle find_or_define_instance_class(Symbol* class_name, |
| 0 | 661 Handle class_loader, |
| 662 instanceKlassHandle k, TRAPS); | |
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663 static instanceKlassHandle load_shared_class(Symbol* class_name, |
| 0 | 664 Handle class_loader, TRAPS); |
| 665 static instanceKlassHandle load_shared_class(instanceKlassHandle ik, | |
| 666 Handle class_loader, TRAPS); | |
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667 static instanceKlassHandle load_instance_class(Symbol* class_name, Handle class_loader, TRAPS); |
| 0 | 668 static Handle compute_loader_lock_object(Handle class_loader, TRAPS); |
| 669 static void check_loader_lock_contention(Handle loader_lock, TRAPS); | |
| 514 | 670 static bool is_parallelCapable(Handle class_loader); |
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671 static bool is_parallelDefine(Handle class_loader); |
| 0 | 672 |
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673 static Klass* find_shared_class(Symbol* class_name); |
| 0 | 674 |
| 675 // Setup link to hierarchy | |
| 676 static void add_to_hierarchy(instanceKlassHandle k, TRAPS); | |
| 677 | |
| 678 private: | |
| 679 // We pass in the hashtable index so we can calculate it outside of | |
| 680 // the SystemDictionary_lock. | |
| 681 | |
| 682 // Basic find on loaded classes | |
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683 static Klass* find_class(int index, unsigned int hash, |
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684 Symbol* name, ClassLoaderData* loader_data); |
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685 static Klass* find_class(Symbol* class_name, ClassLoaderData* loader_data); |
| 0 | 686 |
| 687 // Basic find on classes in the midst of being loaded | |
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688 static Symbol* find_placeholder(Symbol* name, ClassLoaderData* loader_data); |
| 0 | 689 |
| 690 // Updating entry in dictionary | |
| 691 // Add a completely loaded class | |
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692 static void add_klass(int index, Symbol* class_name, |
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693 ClassLoaderData* loader_data, KlassHandle obj); |
| 0 | 694 |
| 695 // Add a placeholder for a class being loaded | |
| 696 static void add_placeholder(int index, | |
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697 Symbol* class_name, |
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698 ClassLoaderData* loader_data); |
| 0 | 699 static void remove_placeholder(int index, |
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700 Symbol* class_name, |
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701 ClassLoaderData* loader_data); |
| 0 | 702 |
| 703 // Performs cleanups after resolve_super_or_fail. This typically needs | |
| 704 // to be called on failure. | |
| 705 // Won't throw, but can block. | |
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706 static void resolution_cleanups(Symbol* class_name, |
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707 ClassLoaderData* loader_data, |
| 0 | 708 TRAPS); |
| 709 | |
| 710 // Initialization | |
| 711 static void initialize_preloaded_classes(TRAPS); | |
| 712 | |
| 713 // Class loader constraints | |
| 714 static void check_constraints(int index, unsigned int hash, | |
| 715 instanceKlassHandle k, Handle loader, | |
| 716 bool defining, TRAPS); | |
| 717 static void update_dictionary(int d_index, unsigned int d_hash, | |
| 718 int p_index, unsigned int p_hash, | |
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719 instanceKlassHandle k, Handle loader, |
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720 TRAPS); |
| 0 | 721 |
| 722 // Variables holding commonly used klasses (preloaded) | |
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723 static Klass* _well_known_klasses[]; |
| 0 | 724 |
| 725 // Lazily loaded klasses | |
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726 static Klass* volatile _abstract_ownable_synchronizer_klass; |
| 0 | 727 |
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728 // table of box klasses (int_klass, etc.) |
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729 static Klass* _box_klasses[T_VOID+1]; |
| 0 | 730 |
| 731 static oop _java_system_loader; | |
| 732 | |
| 733 static bool _has_loadClassInternal; | |
| 734 static bool _has_checkPackageAccess; | |
| 735 }; | |
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736 |
| 1972 | 737 #endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP |