Mercurial > hg > truffle
annotate src/share/vm/classfile/systemDictionary.hpp @ 20619:b12a2a9b05ca
8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
Reviewed-by: mgerdin, coleenp, bdelsart
| author | stefank |
|---|---|
| date | Thu, 02 Oct 2014 10:55:36 +0200 |
| parents | 4cb90023bf2b |
| children | 02c7eebe5f52 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2014, 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 |
| 10405 | 37 |
| 0 | 38 // The system dictionary stores all loaded classes and maps: |
| 39 // | |
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40 // [class name,class loader] -> class i.e. [Symbol*,oop] -> Klass* |
| 0 | 41 // |
| 42 // Classes are loaded lazily. The default VM class loader is | |
| 43 // represented as NULL. | |
| 44 | |
| 45 // The underlying data structure is an open hash table with a fixed number | |
| 46 // of buckets. During loading the loader object is locked, (for the VM loader | |
| 47 // a private lock object is used). Class loading can thus be done concurrently, | |
| 48 // but only by different loaders. | |
| 49 // | |
| 50 // During loading a placeholder (name, loader) is temporarily placed in | |
| 51 // a side data structure, and is used to detect ClassCircularityErrors | |
| 52 // and to perform verification during GC. A GC can occur in the midst | |
| 53 // of class loading, as we call out to Java, have to take locks, etc. | |
| 54 // | |
| 55 // When class loading is finished, a new entry is added to the system | |
| 56 // dictionary and the place holder is removed. Note that the protection | |
| 57 // domain field of the system dictionary has not yet been filled in when | |
| 58 // the "real" system dictionary entry is created. | |
| 59 // | |
| 60 // Clients of this class who are interested in finding if a class has | |
| 61 // been completely loaded -- not classes in the process of being loaded -- | |
| 62 // can read the SystemDictionary unlocked. This is safe because | |
| 63 // - entries are only deleted at safepoints | |
| 64 // - readers cannot come to a safepoint while actively examining | |
| 65 // an entry (an entry cannot be deleted from under a reader) | |
| 66 // - entries must be fully formed before they are available to concurrent | |
| 67 // readers (we must ensure write ordering) | |
| 68 // | |
| 69 // Note that placeholders are deleted at any time, as they are removed | |
| 70 // when a class is completely loaded. Therefore, readers as well as writers | |
| 71 // of placeholders must hold the SystemDictionary_lock. | |
| 72 // | |
| 73 | |
| 74 class Dictionary; | |
| 75 class PlaceholderTable; | |
| 76 class LoaderConstraintTable; | |
| 6197 | 77 template <MEMFLAGS F> class HashtableBucket; |
| 0 | 78 class ResolutionErrorTable; |
| 710 | 79 class SymbolPropertyTable; |
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80 class Ticks; |
| 0 | 81 |
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82 // Certain classes are preloaded, such as java.lang.Object and java.lang.String. |
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83 // They are all "well-known", in the sense that no class loader is allowed |
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84 // to provide a different definition. |
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85 // |
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86 // These klasses must all have names defined in vmSymbols. |
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87 |
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88 #define WK_KLASS_ENUM_NAME(kname) kname##_knum |
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89 |
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90 // Each well-known class has a short klass name (like object_klass), |
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91 // a vmSymbol name (like java_lang_Object), and a flag word |
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92 // that makes some minor distinctions, like whether the klass |
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93 // is preloaded, optional, release-specific, etc. |
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94 // The order of these definitions is significant; it is the order in which |
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95 // preloading is actually performed by initialize_preloaded_classes. |
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96 |
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97 #define WK_KLASSES_DO(do_klass) \ |
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98 /* well-known classes */ \ |
| 6852 | 99 do_klass(Object_klass, java_lang_Object, Pre ) \ |
| 100 do_klass(String_klass, java_lang_String, Pre ) \ | |
| 101 do_klass(Class_klass, java_lang_Class, Pre ) \ | |
| 102 do_klass(Cloneable_klass, java_lang_Cloneable, Pre ) \ | |
| 103 do_klass(ClassLoader_klass, java_lang_ClassLoader, Pre ) \ | |
| 104 do_klass(Serializable_klass, java_io_Serializable, Pre ) \ | |
| 105 do_klass(System_klass, java_lang_System, Pre ) \ | |
| 106 do_klass(Throwable_klass, java_lang_Throwable, Pre ) \ | |
| 107 do_klass(Error_klass, java_lang_Error, Pre ) \ | |
| 108 do_klass(ThreadDeath_klass, java_lang_ThreadDeath, Pre ) \ | |
| 109 do_klass(Exception_klass, java_lang_Exception, Pre ) \ | |
| 110 do_klass(RuntimeException_klass, java_lang_RuntimeException, Pre ) \ | |
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111 do_klass(SecurityManager_klass, java_lang_SecurityManager, Pre ) \ |
| 6852 | 112 do_klass(ProtectionDomain_klass, java_security_ProtectionDomain, Pre ) \ |
| 113 do_klass(AccessControlContext_klass, java_security_AccessControlContext, Pre ) \ | |
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114 do_klass(SecureClassLoader_klass, java_security_SecureClassLoader, Pre ) \ |
| 6852 | 115 do_klass(ClassNotFoundException_klass, java_lang_ClassNotFoundException, Pre ) \ |
| 116 do_klass(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre ) \ | |
| 117 do_klass(LinkageError_klass, java_lang_LinkageError, Pre ) \ | |
| 118 do_klass(ClassCastException_klass, java_lang_ClassCastException, Pre ) \ | |
| 119 do_klass(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre ) \ | |
| 120 do_klass(VirtualMachineError_klass, java_lang_VirtualMachineError, Pre ) \ | |
| 121 do_klass(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre ) \ | |
| 122 do_klass(StackOverflowError_klass, java_lang_StackOverflowError, Pre ) \ | |
| 123 do_klass(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre ) \ | |
| 124 do_klass(Reference_klass, java_lang_ref_Reference, Pre ) \ | |
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125 \ |
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126 /* Preload ref klasses and set reference types */ \ |
| 6852 | 127 do_klass(SoftReference_klass, java_lang_ref_SoftReference, Pre ) \ |
| 128 do_klass(WeakReference_klass, java_lang_ref_WeakReference, Pre ) \ | |
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129 do_klass(FinalReference_klass, java_lang_ref_FinalReference, Pre ) \ |
| 6852 | 130 do_klass(PhantomReference_klass, java_lang_ref_PhantomReference, Pre ) \ |
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131 do_klass(Finalizer_klass, java_lang_ref_Finalizer, Pre ) \ |
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132 \ |
| 6852 | 133 do_klass(Thread_klass, java_lang_Thread, Pre ) \ |
| 134 do_klass(ThreadGroup_klass, java_lang_ThreadGroup, Pre ) \ | |
| 135 do_klass(Properties_klass, java_util_Properties, Pre ) \ | |
| 136 do_klass(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject, Pre ) \ | |
| 137 do_klass(reflect_Field_klass, java_lang_reflect_Field, Pre ) \ | |
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138 do_klass(reflect_Parameter_klass, java_lang_reflect_Parameter, Opt ) \ |
| 6852 | 139 do_klass(reflect_Method_klass, java_lang_reflect_Method, Pre ) \ |
| 140 do_klass(reflect_Constructor_klass, java_lang_reflect_Constructor, Pre ) \ | |
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141 \ |
| 3938 | 142 /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \ |
| 143 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \ | |
| 144 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \ | |
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145 do_klass(reflect_MagicAccessorImpl_klass, sun_reflect_MagicAccessorImpl, Opt ) \ |
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146 do_klass(reflect_MethodAccessorImpl_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \ |
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147 do_klass(reflect_ConstructorAccessorImpl_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \ |
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148 do_klass(reflect_DelegatingClassLoader_klass, sun_reflect_DelegatingClassLoader, Opt ) \ |
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149 do_klass(reflect_ConstantPool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15 ) \ |
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150 do_klass(reflect_UnsafeStaticFieldAccessorImpl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15 ) \ |
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151 do_klass(reflect_CallerSensitive_klass, sun_reflect_CallerSensitive, Opt ) \ |
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152 \ |
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153 /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \ |
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154 do_klass(DirectMethodHandle_klass, java_lang_invoke_DirectMethodHandle, Opt ) \ |
| 6852 | 155 do_klass(MethodHandle_klass, java_lang_invoke_MethodHandle, Pre_JSR292 ) \ |
| 156 do_klass(MemberName_klass, java_lang_invoke_MemberName, Pre_JSR292 ) \ | |
| 157 do_klass(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives, Pre_JSR292 ) \ | |
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158 do_klass(LambdaForm_klass, java_lang_invoke_LambdaForm, Opt ) \ |
| 6852 | 159 do_klass(MethodType_klass, java_lang_invoke_MethodType, Pre_JSR292 ) \ |
| 160 do_klass(BootstrapMethodError_klass, java_lang_BootstrapMethodError, Pre_JSR292 ) \ | |
| 161 do_klass(CallSite_klass, java_lang_invoke_CallSite, Pre_JSR292 ) \ | |
| 162 do_klass(ConstantCallSite_klass, java_lang_invoke_ConstantCallSite, Pre_JSR292 ) \ | |
| 163 do_klass(MutableCallSite_klass, java_lang_invoke_MutableCallSite, Pre_JSR292 ) \ | |
| 164 do_klass(VolatileCallSite_klass, java_lang_invoke_VolatileCallSite, Pre_JSR292 ) \ | |
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165 /* Note: MethodHandle must be first, and VolatileCallSite last in group */ \ |
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166 \ |
| 6852 | 167 do_klass(StringBuffer_klass, java_lang_StringBuffer, Pre ) \ |
| 168 do_klass(StringBuilder_klass, java_lang_StringBuilder, Pre ) \ | |
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169 do_klass(misc_Unsafe_klass, sun_misc_Unsafe, Pre ) \ |
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170 \ |
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171 /* support for CDS */ \ |
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172 do_klass(ByteArrayInputStream_klass, java_io_ByteArrayInputStream, Pre ) \ |
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173 do_klass(File_klass, java_io_File, Pre ) \ |
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174 do_klass(URLClassLoader_klass, java_net_URLClassLoader, Pre ) \ |
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175 do_klass(URL_klass, java_net_URL, Pre ) \ |
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176 do_klass(Jar_Manifest_klass, java_util_jar_Manifest, Pre ) \ |
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177 do_klass(sun_misc_Launcher_klass, sun_misc_Launcher, Pre ) \ |
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178 do_klass(sun_misc_Launcher_AppClassLoader_klass, sun_misc_Launcher_AppClassLoader, Pre ) \ |
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179 do_klass(sun_misc_Launcher_ExtClassLoader_klass, sun_misc_Launcher_ExtClassLoader, Pre ) \ |
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180 do_klass(CodeSource_klass, java_security_CodeSource, Pre ) \ |
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181 \ |
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182 /* It's NULL in non-1.4 JDKs. */ \ |
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183 do_klass(StackTraceElement_klass, java_lang_StackTraceElement, Opt ) \ |
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184 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \ |
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185 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \ |
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186 do_klass(nio_Buffer_klass, java_nio_Buffer, Opt ) \ |
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187 \ |
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188 /* Preload boxing klasses */ \ |
| 6852 | 189 do_klass(Boolean_klass, java_lang_Boolean, Pre ) \ |
| 190 do_klass(Character_klass, java_lang_Character, Pre ) \ | |
| 191 do_klass(Float_klass, java_lang_Float, Pre ) \ | |
| 192 do_klass(Double_klass, java_lang_Double, Pre ) \ | |
| 193 do_klass(Byte_klass, java_lang_Byte, Pre ) \ | |
| 194 do_klass(Short_klass, java_lang_Short, Pre ) \ | |
| 195 do_klass(Integer_klass, java_lang_Integer, Pre ) \ | |
| 196 do_klass(Long_klass, java_lang_Long, Pre ) \ | |
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197 /*end*/ |
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198 |
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199 |
| 0 | 200 class SystemDictionary : AllStatic { |
| 201 friend class VMStructs; | |
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202 friend class SystemDictionaryHandles; |
| 0 | 203 |
| 204 public: | |
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205 enum WKID { |
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206 NO_WKID = 0, |
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207 |
| 3938 | 208 #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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209 WK_KLASSES_DO(WK_KLASS_ENUM) |
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210 #undef WK_KLASS_ENUM |
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211 |
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212 WKID_LIMIT, |
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213 |
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214 FIRST_WKID = NO_WKID + 1 |
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215 }; |
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216 |
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217 enum InitOption { |
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218 Pre, // preloaded; error if not present |
| 6852 | 219 Pre_JSR292, // preloaded if EnableInvokeDynamic |
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220 |
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221 // Order is significant. Options before this point require resolve_or_fail. |
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222 // Options after this point will use resolve_or_null instead. |
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223 |
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224 Opt, // preload tried; NULL if not present |
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225 Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection |
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226 Opt_Only_JDK15, // preload tried; use only with JDK1.5+ |
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227 OPTION_LIMIT, |
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228 CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT) |
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229 }; |
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230 |
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231 |
| 0 | 232 // Returns a class with a given class name and class loader. Loads the |
| 233 // class if needed. If not found a NoClassDefFoundError or a | |
| 234 // ClassNotFoundException is thrown, depending on the value on the | |
| 235 // throw_error flag. For most uses the throw_error argument should be set | |
| 236 // to true. | |
| 237 | |
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238 static Klass* resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS); |
| 0 | 239 // Convenient call for null loader and protection domain. |
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240 static Klass* resolve_or_fail(Symbol* class_name, bool throw_error, TRAPS); |
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241 protected: |
| 0 | 242 // handle error translation for resolve_or_null results |
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243 static Klass* handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS); |
| 0 | 244 |
| 245 public: | |
| 246 | |
| 247 // Returns a class with a given class name and class loader. | |
| 248 // Loads the class if needed. If not found NULL is returned. | |
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249 static Klass* resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
| 0 | 250 // Version with null loader and protection domain |
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251 static Klass* resolve_or_null(Symbol* class_name, TRAPS); |
| 0 | 252 |
| 253 // Resolve a superclass or superinterface. Called from ClassFileParser, | |
| 254 // parse_interfaces, resolve_instance_class_or_null, load_shared_class | |
| 255 // "child_name" is the class whose super class or interface is being resolved. | |
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256 static Klass* resolve_super_or_fail(Symbol* child_name, |
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257 Symbol* class_name, |
| 0 | 258 Handle class_loader, |
| 259 Handle protection_domain, | |
| 260 bool is_superclass, | |
| 261 TRAPS); | |
| 262 | |
| 263 // Parse new stream. This won't update the system dictionary or | |
| 264 // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses. | |
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265 static Klass* parse_stream(Symbol* class_name, |
| 0 | 266 Handle class_loader, |
| 267 Handle protection_domain, | |
| 268 ClassFileStream* st, | |
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269 TRAPS) { |
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270 KlassHandle nullHandle; |
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271 return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD); |
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272 } |
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273 static Klass* parse_stream(Symbol* class_name, |
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274 Handle class_loader, |
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275 Handle protection_domain, |
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276 ClassFileStream* st, |
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277 KlassHandle host_klass, |
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278 GrowableArray<Handle>* cp_patches, |
| 0 | 279 TRAPS); |
| 280 | |
| 281 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass) | |
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282 static Klass* resolve_from_stream(Symbol* class_name, Handle class_loader, |
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283 Handle protection_domain, |
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284 ClassFileStream* st, bool verify, TRAPS); |
| 0 | 285 |
| 286 // Lookup an already loaded class. If not found NULL is returned. | |
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287 static Klass* find(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
| 0 | 288 |
| 289 // Lookup an already loaded instance or array class. | |
| 290 // Do not make any queries to class loaders; consult only the cache. | |
| 291 // If not found NULL is returned. | |
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292 static Klass* find_instance_or_array_klass(Symbol* class_name, |
| 0 | 293 Handle class_loader, |
| 294 Handle protection_domain, | |
| 295 TRAPS); | |
| 296 | |
| 297 // Lookup an instance or array class that has already been loaded | |
| 298 // either into the given class loader, or else into another class | |
| 299 // loader that is constrained (via loader constraints) to produce | |
| 300 // a consistent class. Do not take protection domains into account. | |
| 301 // Do not make any queries to class loaders; consult only the cache. | |
| 302 // Return NULL if the class is not found. | |
| 303 // | |
| 304 // This function is a strict superset of find_instance_or_array_klass. | |
| 305 // This function (the unchecked version) makes a conservative prediction | |
| 306 // of the result of the checked version, assuming successful lookup. | |
| 307 // If both functions return non-null, they must return the same value. | |
| 308 // Also, the unchecked version may sometimes be non-null where the | |
| 309 // checked version is null. This can occur in several ways: | |
| 310 // 1. No query has yet been made to the class loader. | |
| 311 // 2. The class loader was queried, but chose not to delegate. | |
| 312 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain. | |
| 313 // 4. Loading was attempted, but there was a linkage error of some sort. | |
| 314 // In all of these cases, the loader constraints on this type are | |
| 315 // satisfied, and it is safe for classes in the given class loader | |
| 316 // to manipulate strongly-typed values of the found class, subject | |
| 317 // to local linkage and access checks. | |
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318 static Klass* find_constrained_instance_or_array_klass(Symbol* class_name, |
| 0 | 319 Handle class_loader, |
| 320 TRAPS); | |
| 321 | |
| 322 // Iterate over all klasses in dictionary | |
| 323 // Just the classes from defining class loaders | |
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324 static void classes_do(void f(Klass*)); |
| 0 | 325 // Added for initialize_itable_for_klass to handle exceptions |
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326 static void classes_do(void f(Klass*, TRAPS), TRAPS); |
| 0 | 327 // All classes, and their class loaders |
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328 static void classes_do(void f(Klass*, ClassLoaderData*)); |
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329 |
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330 static void placeholders_do(void f(Symbol*)); |
| 0 | 331 |
| 332 // Iterate over all methods in all klasses in dictionary | |
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333 static void methods_do(void f(Method*)); |
| 0 | 334 |
| 335 // Garbage collection support | |
| 336 | |
| 337 // This method applies "blk->do_oop" to all the pointers to "system" | |
| 338 // classes and loaders. | |
| 339 static void always_strong_oops_do(OopClosure* blk); | |
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340 static void always_strong_classes_do(KlassClosure* closure); |
| 0 | 341 |
| 342 // Unload (that is, break root links to) all unmarked classes and | |
| 343 // loaders. Returns "true" iff something was unloaded. | |
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344 static bool do_unloading(BoolObjectClosure* is_alive, bool clean_alive = true); |
| 0 | 345 |
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346 // Used by DumpSharedSpaces only to remove classes that failed verification |
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347 static void remove_classes_in_error_state(); |
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348 |
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349 static int calculate_systemdictionary_size(int loadedclasses); |
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350 |
| 0 | 351 // Applies "f->do_oop" to all root oops in the system dictionary. |
| 352 static void oops_do(OopClosure* f); | |
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353 static void roots_oops_do(OopClosure* strong, OopClosure* weak); |
| 0 | 354 |
| 355 // System loader lock | |
| 356 static oop system_loader_lock() { return _system_loader_lock_obj; } | |
| 357 | |
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358 protected: |
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359 // Extended Redefine classes support (tbi) |
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360 static void preloaded_classes_do(KlassClosure* f); |
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361 static void lazily_loaded_classes_do(KlassClosure* f); |
| 0 | 362 public: |
| 363 // Sharing support. | |
| 364 static void reorder_dictionary(); | |
| 365 static void copy_buckets(char** top, char* end); | |
| 366 static void copy_table(char** top, char* end); | |
| 367 static void reverse(); | |
| 6197 | 368 static void set_shared_dictionary(HashtableBucket<mtClass>* t, int length, |
| 0 | 369 int number_of_entries); |
| 370 // Printing | |
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371 static void print(bool details = true); |
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372 static void print_shared(bool details = true); |
| 0 | 373 static void print_class_statistics() PRODUCT_RETURN; |
| 374 static void print_method_statistics() PRODUCT_RETURN; | |
| 375 | |
| 376 // Number of contained klasses | |
| 377 // This is both fully loaded classes and classes in the process | |
| 378 // of being loaded | |
| 379 static int number_of_classes(); | |
| 380 | |
| 381 // Monotonically increasing counter which grows as classes are | |
| 382 // loaded or modifications such as hot-swapping or setting/removing | |
| 383 // of breakpoints are performed | |
| 384 static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; } | |
| 385 // Needed by evolution and breakpoint code | |
| 386 static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; } | |
| 387 | |
| 388 // Verification | |
| 389 static void verify(); | |
| 390 | |
| 391 #ifdef ASSERT | |
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392 static bool is_internal_format(Symbol* class_name); |
| 0 | 393 #endif |
| 394 | |
| 395 // Initialization | |
| 396 static void initialize(TRAPS); | |
| 397 | |
| 398 // Fast access to commonly used classes (preloaded) | |
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399 static Klass* check_klass(Klass* k) { |
| 0 | 400 assert(k != NULL, "preloaded klass not initialized"); |
| 401 return k; | |
| 402 } | |
| 403 | |
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404 static Klass* check_klass_Pre( Klass* k) { return check_klass(k); } |
| 6852 | 405 static Klass* check_klass_Pre_JSR292(Klass* k) { return EnableInvokeDynamic ? check_klass(k) : k; } |
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406 static Klass* check_klass_Opt( Klass* k) { return k; } |
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407 static Klass* check_klass_Opt_Only_JDK15(Klass* k) { |
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408 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only"); |
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409 return k; |
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410 } |
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411 static Klass* check_klass_Opt_Only_JDK14NewRef(Klass* k) { |
| 0 | 412 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only"); |
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413 // despite the optional loading, if you use this it must be present: |
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414 return check_klass(k); |
| 0 | 415 } |
| 416 | |
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417 static bool initialize_wk_klass(WKID id, int init_opt, TRAPS); |
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418 static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS); |
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419 static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) { |
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420 int limit = (int)end_id + 1; |
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421 initialize_wk_klasses_until((WKID) limit, start_id, THREAD); |
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422 } |
| 0 | 423 |
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424 public: |
| 3938 | 425 #define WK_KLASS_DECLARE(name, symbol, option) \ |
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426 static Klass* name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } \ |
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427 static Klass** name##_addr() { \ |
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428 return &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \ |
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429 } |
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430 WK_KLASSES_DO(WK_KLASS_DECLARE); |
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431 #undef WK_KLASS_DECLARE |
| 0 | 432 |
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433 static Klass* well_known_klass(WKID id) { |
| 3938 | 434 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
| 435 return _well_known_klasses[id]; | |
| 436 } | |
| 437 | |
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438 static Klass** well_known_klass_addr(WKID id) { |
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439 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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440 return &_well_known_klasses[id]; |
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441 } |
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442 |
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443 // Local definition for direct access to the private array: |
| 147 | 444 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)] |
| 0 | 445 |
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446 static Klass* box_klass(BasicType t) { |
| 0 | 447 assert((uint)t < T_VOID+1, "range check"); |
| 448 return check_klass(_box_klasses[t]); | |
| 449 } | |
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450 static BasicType box_klass_type(Klass* k); // inverse of box_klass |
| 0 | 451 |
| 452 // methods returning lazily loaded klasses | |
| 453 // The corresponding method to load the class must be called before calling them. | |
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454 static Klass* abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); } |
| 0 | 455 |
| 456 static void load_abstract_ownable_synchronizer_klass(TRAPS); | |
| 457 | |
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458 protected: |
| 0 | 459 // Tells whether ClassLoader.loadClassInternal is present |
| 460 static bool has_loadClassInternal() { return _has_loadClassInternal; } | |
| 461 | |
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462 // Returns the class loader data to be used when looking up/updating the |
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463 // system dictionary. |
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464 static ClassLoaderData *class_loader_data(Handle class_loader) { |
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465 return ClassLoaderData::class_loader_data(class_loader()); |
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466 } |
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467 |
| 0 | 468 public: |
| 469 // Tells whether ClassLoader.checkPackageAccess is present | |
| 470 static bool has_checkPackageAccess() { return _has_checkPackageAccess; } | |
| 471 | |
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472 static bool Parameter_klass_loaded() { return WK_KLASS(reflect_Parameter_klass) != NULL; } |
| 1142 | 473 static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; } |
| 474 static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; } | |
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475 static bool Object_klass_loaded() { return WK_KLASS(Object_klass) != NULL; } |
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476 static bool ClassLoader_klass_loaded() { return WK_KLASS(ClassLoader_klass) != NULL; } |
| 0 | 477 |
| 478 // Returns default system loader | |
| 479 static oop java_system_loader(); | |
| 480 | |
| 481 // Compute the default system loader | |
| 482 static void compute_java_system_loader(TRAPS); | |
| 483 | |
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484 // Register a new class loader |
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485 static ClassLoaderData* register_loader(Handle class_loader, TRAPS); |
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486 protected: |
| 0 | 487 // Mirrors for primitive classes (created eagerly) |
| 488 static oop check_mirror(oop m) { | |
| 489 assert(m != NULL, "mirror not initialized"); | |
| 490 return m; | |
| 491 } | |
| 492 | |
| 493 public: | |
| 494 // Note: java_lang_Class::primitive_type is the inverse of java_mirror | |
| 495 | |
| 496 // Check class loader constraints | |
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497 static bool add_loader_constraint(Symbol* name, Handle loader1, |
| 0 | 498 Handle loader2, TRAPS); |
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499 static Symbol* check_signature_loaders(Symbol* signature, Handle loader1, |
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500 Handle loader2, bool is_method, TRAPS); |
| 0 | 501 |
| 710 | 502 // JSR 292 |
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503 // find a java.lang.invoke.MethodHandle.invoke* method for a given signature |
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504 // (asks Java to compute it if necessary, except in a compiler thread) |
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505 static methodHandle find_method_handle_invoker(Symbol* name, |
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506 Symbol* signature, |
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507 KlassHandle accessing_klass, |
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508 Handle *appendix_result, |
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509 Handle *method_type_result, |
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510 TRAPS); |
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511 // for a given signature, find the internal MethodHandle method (linkTo* or invokeBasic) |
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512 // (does not ask Java, since this is a low-level intrinsic defined by the JVM) |
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513 static methodHandle find_method_handle_intrinsic(vmIntrinsics::ID iid, |
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514 Symbol* signature, |
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515 TRAPS); |
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516 // find a java.lang.invoke.MethodType object for a given signature |
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517 // (asks Java to compute it if necessary, except in a compiler thread) |
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518 static Handle find_method_handle_type(Symbol* signature, |
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519 KlassHandle accessing_klass, |
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520 TRAPS); |
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521 |
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522 // ask Java to compute a java.lang.invoke.MethodHandle object for a given CP entry |
| 1602 | 523 static Handle link_method_handle_constant(KlassHandle caller, |
| 524 int ref_kind, //e.g., JVM_REF_invokeVirtual | |
| 525 KlassHandle callee, | |
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526 Symbol* name, |
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527 Symbol* signature, |
| 1602 | 528 TRAPS); |
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529 |
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530 // ask Java to create a dynamic call site, while linking an invokedynamic op |
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531 static methodHandle find_dynamic_call_site_invoker(KlassHandle caller, |
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532 Handle bootstrap_method, |
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533 Symbol* name, |
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534 Symbol* type, |
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535 Handle *appendix_result, |
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536 Handle *method_type_result, |
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537 TRAPS); |
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538 |
| 0 | 539 // Utility for printing loader "name" as part of tracing constraints |
| 540 static const char* loader_name(oop loader) { | |
| 541 return ((loader) == NULL ? "<bootloader>" : | |
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542 InstanceKlass::cast((loader)->klass())->name()->as_C_string() ); |
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543 } |
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544 static const char* loader_name(ClassLoaderData* loader_data) { |
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545 return (loader_data->class_loader() == NULL ? "<bootloader>" : |
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546 InstanceKlass::cast((loader_data->class_loader())->klass())->name()->as_C_string() ); |
| 0 | 547 } |
| 548 | |
| 549 // Record the error when the first attempt to resolve a reference from a constant | |
| 550 // pool entry to a class fails. | |
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551 static void add_resolution_error(constantPoolHandle pool, int which, Symbol* error); |
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552 static void delete_resolution_error(ConstantPool* pool); |
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553 static Symbol* find_resolution_error(constantPoolHandle pool, int which); |
| 0 | 554 |
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555 protected: |
| 0 | 556 |
| 557 enum Constants { | |
| 558 _loader_constraint_size = 107, // number of entries in constraint table | |
| 559 _resolution_error_size = 107, // number of entries in resolution error table | |
| 710 | 560 _invoke_method_size = 139, // number of entries in invoke method table |
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561 _nof_buckets = 1009, // number of buckets in hash table for placeholders |
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562 _old_default_sdsize = 1009, // backward compat for system dictionary size |
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563 _prime_array_size = 8, // array of primes for system dictionary size |
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564 _average_depth_goal = 3 // goal for lookup length |
| 0 | 565 }; |
| 566 | |
| 567 | |
| 568 // Static variables | |
| 569 | |
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570 // hashtable sizes for system dictionary to allow growth |
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571 // prime numbers for system dictionary size |
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572 static int _sdgeneration; |
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573 static const int _primelist[_prime_array_size]; |
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574 |
| 0 | 575 // Hashtable holding loaded classes. |
| 576 static Dictionary* _dictionary; | |
| 577 | |
| 578 // Hashtable holding placeholders for classes being loaded. | |
| 579 static PlaceholderTable* _placeholders; | |
| 580 | |
| 581 // Hashtable holding classes from the shared archive. | |
| 582 static Dictionary* _shared_dictionary; | |
| 583 | |
| 584 // Monotonically increasing counter which grows with | |
| 585 // _number_of_classes as well as hot-swapping and breakpoint setting | |
| 586 // and removal. | |
| 587 static int _number_of_modifications; | |
| 588 | |
| 589 // Lock object for system class loader | |
| 590 static oop _system_loader_lock_obj; | |
| 591 | |
| 592 // Constraints on class loaders | |
| 593 static LoaderConstraintTable* _loader_constraints; | |
| 594 | |
| 595 // Resolution errors | |
| 596 static ResolutionErrorTable* _resolution_errors; | |
| 597 | |
| 710 | 598 // Invoke methods (JSR 292) |
| 599 static SymbolPropertyTable* _invoke_method_table; | |
| 600 | |
| 0 | 601 public: |
| 602 // for VM_CounterDecay iteration support | |
| 603 friend class CounterDecay; | |
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604 static Klass* try_get_next_class(); |
| 0 | 605 |
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606 protected: |
| 0 | 607 static void validate_protection_domain(instanceKlassHandle klass, |
| 608 Handle class_loader, | |
| 609 Handle protection_domain, TRAPS); | |
| 610 | |
| 611 friend class VM_PopulateDumpSharedSpace; | |
| 612 friend class TraversePlaceholdersClosure; | |
| 613 static Dictionary* dictionary() { return _dictionary; } | |
| 614 static Dictionary* shared_dictionary() { return _shared_dictionary; } | |
| 615 static PlaceholderTable* placeholders() { return _placeholders; } | |
| 616 static LoaderConstraintTable* constraints() { return _loader_constraints; } | |
| 617 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; } | |
| 710 | 618 static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; } |
| 0 | 619 |
| 620 // Basic loading operations | |
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621 static Klass* resolve_instance_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
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622 static Klass* resolve_array_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
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623 static instanceKlassHandle handle_parallel_super_load(Symbol* class_name, Symbol* supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS); |
| 0 | 624 // Wait on SystemDictionary_lock; unlocks lockObject before |
| 625 // waiting; relocks lockObject with correct recursion count | |
| 626 // after waiting, but before reentering SystemDictionary_lock | |
| 627 // to preserve lock order semantics. | |
| 628 static void double_lock_wait(Handle lockObject, TRAPS); | |
| 629 static void define_instance_class(instanceKlassHandle k, TRAPS); | |
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630 static instanceKlassHandle find_or_define_instance_class(Symbol* class_name, |
| 0 | 631 Handle class_loader, |
| 632 instanceKlassHandle k, TRAPS); | |
| 633 static instanceKlassHandle load_shared_class(instanceKlassHandle ik, | |
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634 Handle class_loader, |
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635 Handle protection_domain, |
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636 TRAPS); |
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637 static instanceKlassHandle load_instance_class(Symbol* class_name, Handle class_loader, TRAPS); |
| 0 | 638 static Handle compute_loader_lock_object(Handle class_loader, TRAPS); |
| 639 static void check_loader_lock_contention(Handle loader_lock, TRAPS); | |
| 514 | 640 static bool is_parallelCapable(Handle class_loader); |
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641 static bool is_parallelDefine(Handle class_loader); |
| 0 | 642 |
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643 public: |
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644 static instanceKlassHandle load_shared_class(Symbol* class_name, |
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645 Handle class_loader, |
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646 TRAPS); |
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647 static bool is_ext_class_loader(Handle class_loader); |
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648 |
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649 protected: |
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650 static Klass* find_shared_class(Symbol* class_name); |
| 0 | 651 |
| 652 // Setup link to hierarchy | |
| 653 static void add_to_hierarchy(instanceKlassHandle k, TRAPS); | |
| 654 | |
| 10405 | 655 // event based tracing |
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656 static void post_class_load_event(const Ticks& start_time, instanceKlassHandle k, |
| 10405 | 657 Handle initiating_loader); |
| 0 | 658 // We pass in the hashtable index so we can calculate it outside of |
| 659 // the SystemDictionary_lock. | |
| 660 | |
| 661 // Basic find on loaded classes | |
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662 static Klass* find_class(int index, unsigned int hash, |
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663 Symbol* name, ClassLoaderData* loader_data); |
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664 static Klass* find_class(Symbol* class_name, ClassLoaderData* loader_data); |
| 0 | 665 |
| 666 // Basic find on classes in the midst of being loaded | |
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667 static Symbol* find_placeholder(Symbol* name, ClassLoaderData* loader_data); |
| 0 | 668 |
| 669 // Updating entry in dictionary | |
| 670 // Add a completely loaded class | |
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671 static void add_klass(int index, Symbol* class_name, |
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672 ClassLoaderData* loader_data, KlassHandle obj); |
| 0 | 673 |
| 674 // Add a placeholder for a class being loaded | |
| 675 static void add_placeholder(int index, | |
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676 Symbol* class_name, |
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677 ClassLoaderData* loader_data); |
| 0 | 678 static void remove_placeholder(int index, |
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679 Symbol* class_name, |
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680 ClassLoaderData* loader_data); |
| 0 | 681 |
| 682 // Performs cleanups after resolve_super_or_fail. This typically needs | |
| 683 // to be called on failure. | |
| 684 // Won't throw, but can block. | |
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685 static void resolution_cleanups(Symbol* class_name, |
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686 ClassLoaderData* loader_data, |
| 0 | 687 TRAPS); |
| 688 | |
| 689 // Initialization | |
| 690 static void initialize_preloaded_classes(TRAPS); | |
| 691 | |
| 692 // Class loader constraints | |
| 693 static void check_constraints(int index, unsigned int hash, | |
| 694 instanceKlassHandle k, Handle loader, | |
| 695 bool defining, TRAPS); | |
| 696 static void update_dictionary(int d_index, unsigned int d_hash, | |
| 697 int p_index, unsigned int p_hash, | |
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698 instanceKlassHandle k, Handle loader, |
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699 TRAPS); |
| 0 | 700 |
| 701 // Variables holding commonly used klasses (preloaded) | |
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702 static Klass* _well_known_klasses[]; |
| 0 | 703 |
| 704 // Lazily loaded klasses | |
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705 static Klass* volatile _abstract_ownable_synchronizer_klass; |
| 0 | 706 |
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707 // table of box klasses (int_klass, etc.) |
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708 static Klass* _box_klasses[T_VOID+1]; |
| 0 | 709 |
| 710 static oop _java_system_loader; | |
| 711 | |
| 712 static bool _has_loadClassInternal; | |
| 713 static bool _has_checkPackageAccess; | |
| 714 }; | |
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715 |
| 1972 | 716 #endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP |