Mercurial > hg > truffle
annotate src/share/vm/classfile/systemDictionary.hpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | 1d7922586cf6 |
| children | f6b0eb4e44cf |
| 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(template) \ |
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96 /* well-known classes */ \ |
| 1142 | 97 template(Object_klass, java_lang_Object, Pre) \ |
| 98 template(String_klass, java_lang_String, Pre) \ | |
| 99 template(Class_klass, java_lang_Class, Pre) \ | |
| 100 template(Cloneable_klass, java_lang_Cloneable, Pre) \ | |
| 101 template(ClassLoader_klass, java_lang_ClassLoader, Pre) \ | |
| 102 template(Serializable_klass, java_io_Serializable, Pre) \ | |
| 103 template(System_klass, java_lang_System, Pre) \ | |
| 104 template(Throwable_klass, java_lang_Throwable, Pre) \ | |
| 105 template(Error_klass, java_lang_Error, Pre) \ | |
| 106 template(ThreadDeath_klass, java_lang_ThreadDeath, Pre) \ | |
| 107 template(Exception_klass, java_lang_Exception, Pre) \ | |
| 108 template(RuntimeException_klass, java_lang_RuntimeException, Pre) \ | |
| 109 template(ProtectionDomain_klass, java_security_ProtectionDomain, Pre) \ | |
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110 template(AccessControlContext_klass, java_security_AccessControlContext, Pre) \ |
| 1142 | 111 template(ClassNotFoundException_klass, java_lang_ClassNotFoundException, Pre) \ |
| 112 template(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre) \ | |
| 113 template(LinkageError_klass, java_lang_LinkageError, Pre) \ | |
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114 template(ClassCastException_klass, java_lang_ClassCastException, Pre) \ |
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115 template(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre) \ |
| 1142 | 116 template(VirtualMachineError_klass, java_lang_VirtualMachineError, Pre) \ |
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117 template(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre) \ |
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118 template(StackOverflowError_klass, java_lang_StackOverflowError, Pre) \ |
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119 template(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre) \ |
| 1142 | 120 template(Reference_klass, java_lang_ref_Reference, Pre) \ |
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121 \ |
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122 /* Preload ref klasses and set reference types */ \ |
| 1142 | 123 template(SoftReference_klass, java_lang_ref_SoftReference, Pre) \ |
| 124 template(WeakReference_klass, java_lang_ref_WeakReference, Pre) \ | |
| 125 template(FinalReference_klass, java_lang_ref_FinalReference, Pre) \ | |
| 126 template(PhantomReference_klass, java_lang_ref_PhantomReference, Pre) \ | |
| 127 template(Finalizer_klass, java_lang_ref_Finalizer, Pre) \ | |
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128 \ |
| 1142 | 129 template(Thread_klass, java_lang_Thread, Pre) \ |
| 130 template(ThreadGroup_klass, java_lang_ThreadGroup, Pre) \ | |
| 131 template(Properties_klass, java_util_Properties, Pre) \ | |
| 132 template(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject, Pre) \ | |
| 133 template(reflect_Field_klass, java_lang_reflect_Field, Pre) \ | |
| 134 template(reflect_Method_klass, java_lang_reflect_Method, Pre) \ | |
| 135 template(reflect_Constructor_klass, java_lang_reflect_Constructor, Pre) \ | |
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136 \ |
| 3938 | 137 /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \ |
| 138 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \ | |
| 139 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \ | |
| 140 template(reflect_MagicAccessorImpl_klass, sun_reflect_MagicAccessorImpl, Opt) \ | |
| 141 template(reflect_MethodAccessorImpl_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \ | |
| 142 template(reflect_ConstructorAccessorImpl_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \ | |
| 143 template(reflect_DelegatingClassLoader_klass, sun_reflect_DelegatingClassLoader, Opt) \ | |
| 144 template(reflect_ConstantPool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15) \ | |
| 145 template(reflect_UnsafeStaticFieldAccessorImpl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15) \ | |
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146 \ |
| 710 | 147 /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \ |
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148 template(MethodHandle_klass, java_lang_invoke_MethodHandle, Pre_JSR292) \ |
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149 template(MemberName_klass, java_lang_invoke_MemberName, Pre_JSR292) \ |
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150 template(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives, Pre_JSR292) \ |
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151 template(LambdaForm_klass, java_lang_invoke_LambdaForm, Opt) \ |
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152 template(MethodType_klass, java_lang_invoke_MethodType, Pre_JSR292) \ |
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153 template(BootstrapMethodError_klass, java_lang_BootstrapMethodError, Pre_JSR292) \ |
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154 template(CallSite_klass, java_lang_invoke_CallSite, Pre_JSR292) \ |
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155 template(ConstantCallSite_klass, java_lang_invoke_ConstantCallSite, Pre_JSR292) \ |
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156 template(MutableCallSite_klass, java_lang_invoke_MutableCallSite, Pre_JSR292) \ |
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157 template(VolatileCallSite_klass, java_lang_invoke_VolatileCallSite, Pre_JSR292) \ |
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158 /* Note: MethodHandle must be first, and VolatileCallSite last in group */ \ |
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159 \ |
| 1142 | 160 template(StringBuffer_klass, java_lang_StringBuffer, Pre) \ |
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161 template(StringBuilder_klass, java_lang_StringBuilder, Pre) \ |
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162 \ |
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163 /* It's NULL in non-1.4 JDKs. */ \ |
| 1142 | 164 template(StackTraceElement_klass, java_lang_StackTraceElement, Opt) \ |
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165 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \ |
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166 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \ |
| 3938 | 167 template(nio_Buffer_klass, java_nio_Buffer, Opt) \ |
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168 \ |
| 3938 | 169 template(DownloadManager_klass, sun_jkernel_DownloadManager, Opt_Kernel) \ |
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170 \ |
| 3938 | 171 template(PostVMInitHook_klass, sun_misc_PostVMInitHook, Opt) \ |
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172 \ |
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173 /* Preload boxing klasses */ \ |
| 1142 | 174 template(Boolean_klass, java_lang_Boolean, Pre) \ |
| 175 template(Character_klass, java_lang_Character, Pre) \ | |
| 176 template(Float_klass, java_lang_Float, Pre) \ | |
| 177 template(Double_klass, java_lang_Double, Pre) \ | |
| 178 template(Byte_klass, java_lang_Byte, Pre) \ | |
| 179 template(Short_klass, java_lang_Short, Pre) \ | |
| 180 template(Integer_klass, java_lang_Integer, Pre) \ | |
| 181 template(Long_klass, java_lang_Long, Pre) \ | |
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182 /*end*/ |
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183 |
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184 |
| 0 | 185 class SystemDictionary : AllStatic { |
| 186 friend class VMStructs; | |
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187 friend class SystemDictionaryHandles; |
| 0 | 188 |
| 189 public: | |
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190 enum WKID { |
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191 NO_WKID = 0, |
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192 |
| 3938 | 193 #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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194 WK_KLASSES_DO(WK_KLASS_ENUM) |
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195 #undef WK_KLASS_ENUM |
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196 |
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197 WKID_LIMIT, |
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198 |
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199 FIRST_WKID = NO_WKID + 1 |
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200 }; |
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201 |
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202 enum InitOption { |
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203 Pre, // preloaded; error if not present |
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204 Pre_JSR292, // preloaded if EnableInvokeDynamic |
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205 |
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206 // Order is significant. Options before this point require resolve_or_fail. |
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207 // Options after this point will use resolve_or_null instead. |
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208 |
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209 Opt, // preload tried; NULL if not present |
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210 Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection |
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211 Opt_Only_JDK15, // preload tried; use only with JDK1.5+ |
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212 Opt_Kernel, // preload tried only #ifdef KERNEL |
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213 OPTION_LIMIT, |
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214 CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT) |
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215 }; |
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216 |
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217 |
| 0 | 218 // Returns a class with a given class name and class loader. Loads the |
| 219 // class if needed. If not found a NoClassDefFoundError or a | |
| 220 // ClassNotFoundException is thrown, depending on the value on the | |
| 221 // throw_error flag. For most uses the throw_error argument should be set | |
| 222 // to true. | |
| 223 | |
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224 static Klass* resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS); |
| 0 | 225 // Convenient call for null loader and protection domain. |
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226 static Klass* resolve_or_fail(Symbol* class_name, bool throw_error, TRAPS); |
| 0 | 227 private: |
| 228 // handle error translation for resolve_or_null results | |
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229 static Klass* handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS); |
| 0 | 230 |
| 231 public: | |
| 232 | |
| 233 // Returns a class with a given class name and class loader. | |
| 234 // Loads the class if needed. If not found NULL is returned. | |
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235 static Klass* resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
| 0 | 236 // Version with null loader and protection domain |
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237 static Klass* resolve_or_null(Symbol* class_name, TRAPS); |
| 0 | 238 |
| 239 // Resolve a superclass or superinterface. Called from ClassFileParser, | |
| 240 // parse_interfaces, resolve_instance_class_or_null, load_shared_class | |
| 241 // "child_name" is the class whose super class or interface is being resolved. | |
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242 static Klass* resolve_super_or_fail(Symbol* child_name, |
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243 Symbol* class_name, |
| 0 | 244 Handle class_loader, |
| 245 Handle protection_domain, | |
| 246 bool is_superclass, | |
| 247 TRAPS); | |
| 248 | |
| 249 // Parse new stream. This won't update the system dictionary or | |
| 250 // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses. | |
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251 static Klass* parse_stream(Symbol* class_name, |
| 0 | 252 Handle class_loader, |
| 253 Handle protection_domain, | |
| 254 ClassFileStream* st, | |
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255 TRAPS) { |
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256 KlassHandle nullHandle; |
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257 return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD); |
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258 } |
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259 static Klass* parse_stream(Symbol* class_name, |
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260 Handle class_loader, |
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261 Handle protection_domain, |
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262 ClassFileStream* st, |
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263 KlassHandle host_klass, |
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264 GrowableArray<Handle>* cp_patches, |
| 0 | 265 TRAPS); |
| 266 | |
| 267 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass) | |
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268 static Klass* resolve_from_stream(Symbol* class_name, Handle class_loader, |
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269 Handle protection_domain, |
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270 ClassFileStream* st, bool verify, TRAPS); |
| 0 | 271 |
| 272 // Lookup an already loaded class. If not found NULL is returned. | |
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273 static Klass* find(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
| 0 | 274 |
| 275 // Lookup an already loaded instance or array class. | |
| 276 // Do not make any queries to class loaders; consult only the cache. | |
| 277 // If not found NULL is returned. | |
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278 static Klass* find_instance_or_array_klass(Symbol* class_name, |
| 0 | 279 Handle class_loader, |
| 280 Handle protection_domain, | |
| 281 TRAPS); | |
| 282 | |
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283 // If the given name is known to vmSymbols, return the well-know klass: |
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284 static Klass* find_well_known_klass(Symbol* class_name); |
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285 |
| 0 | 286 // Lookup an instance or array class that has already been loaded |
| 287 // either into the given class loader, or else into another class | |
| 288 // loader that is constrained (via loader constraints) to produce | |
| 289 // a consistent class. Do not take protection domains into account. | |
| 290 // Do not make any queries to class loaders; consult only the cache. | |
| 291 // Return NULL if the class is not found. | |
| 292 // | |
| 293 // This function is a strict superset of find_instance_or_array_klass. | |
| 294 // This function (the unchecked version) makes a conservative prediction | |
| 295 // of the result of the checked version, assuming successful lookup. | |
| 296 // If both functions return non-null, they must return the same value. | |
| 297 // Also, the unchecked version may sometimes be non-null where the | |
| 298 // checked version is null. This can occur in several ways: | |
| 299 // 1. No query has yet been made to the class loader. | |
| 300 // 2. The class loader was queried, but chose not to delegate. | |
| 301 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain. | |
| 302 // 4. Loading was attempted, but there was a linkage error of some sort. | |
| 303 // In all of these cases, the loader constraints on this type are | |
| 304 // satisfied, and it is safe for classes in the given class loader | |
| 305 // to manipulate strongly-typed values of the found class, subject | |
| 306 // to local linkage and access checks. | |
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307 static Klass* find_constrained_instance_or_array_klass(Symbol* class_name, |
| 0 | 308 Handle class_loader, |
| 309 TRAPS); | |
| 310 | |
| 311 // Iterate over all klasses in dictionary | |
| 312 // Just the classes from defining class loaders | |
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313 static void classes_do(void f(Klass*)); |
| 0 | 314 // Added for initialize_itable_for_klass to handle exceptions |
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315 static void classes_do(void f(Klass*, TRAPS), TRAPS); |
| 0 | 316 // All classes, and their class loaders |
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317 static void classes_do(void f(Klass*, ClassLoaderData*)); |
| 0 | 318 // All classes, and their class loaders |
| 319 // (added for helpers that use HandleMarks and ResourceMarks) | |
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320 static void classes_do(void f(Klass*, ClassLoaderData*, TRAPS), TRAPS); |
| 0 | 321 // All entries in the placeholder table and their class loaders |
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322 static void placeholders_do(void f(Symbol*)); |
| 0 | 323 |
| 324 // Iterate over all methods in all klasses in dictionary | |
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325 static void methods_do(void f(Method*)); |
| 0 | 326 |
| 327 // Garbage collection support | |
| 328 | |
| 329 // This method applies "blk->do_oop" to all the pointers to "system" | |
| 330 // classes and loaders. | |
| 331 static void always_strong_oops_do(OopClosure* blk); | |
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332 static void always_strong_classes_do(KlassClosure* closure); |
| 0 | 333 |
| 334 // Unload (that is, break root links to) all unmarked classes and | |
| 335 // loaders. Returns "true" iff something was unloaded. | |
| 336 static bool do_unloading(BoolObjectClosure* is_alive); | |
| 337 | |
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338 static int calculate_systemdictionary_size(int loadedclasses); |
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339 |
| 0 | 340 // Applies "f->do_oop" to all root oops in the system dictionary. |
| 341 static void oops_do(OopClosure* f); | |
| 342 | |
| 343 // System loader lock | |
| 344 static oop system_loader_lock() { return _system_loader_lock_obj; } | |
| 345 | |
| 346 private: | |
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347 // Extended Redefine classes support (tbi) |
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348 static void preloaded_classes_do(KlassClosure* f); |
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349 static void lazily_loaded_classes_do(KlassClosure* f); |
| 0 | 350 public: |
| 351 // Sharing support. | |
| 352 static void reorder_dictionary(); | |
| 353 static void copy_buckets(char** top, char* end); | |
| 354 static void copy_table(char** top, char* end); | |
| 355 static void reverse(); | |
| 6197 | 356 static void set_shared_dictionary(HashtableBucket<mtClass>* t, int length, |
| 0 | 357 int number_of_entries); |
| 358 // Printing | |
| 359 static void print() PRODUCT_RETURN; | |
| 360 static void print_class_statistics() PRODUCT_RETURN; | |
| 361 static void print_method_statistics() PRODUCT_RETURN; | |
| 362 | |
| 363 // Number of contained klasses | |
| 364 // This is both fully loaded classes and classes in the process | |
| 365 // of being loaded | |
| 366 static int number_of_classes(); | |
| 367 | |
| 368 // Monotonically increasing counter which grows as classes are | |
| 369 // loaded or modifications such as hot-swapping or setting/removing | |
| 370 // of breakpoints are performed | |
| 371 static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; } | |
| 372 // Needed by evolution and breakpoint code | |
| 373 static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; } | |
| 374 | |
| 375 // Verification | |
| 376 static void verify(); | |
| 377 | |
| 378 #ifdef ASSERT | |
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379 static bool is_internal_format(Symbol* class_name); |
| 0 | 380 #endif |
| 381 | |
| 382 // Verify class is in dictionary | |
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383 static void verify_obj_klass_present(Symbol* class_name, |
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384 ClassLoaderData* loader_data); |
| 0 | 385 |
| 386 // Initialization | |
| 387 static void initialize(TRAPS); | |
| 388 | |
| 389 // Fast access to commonly used classes (preloaded) | |
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390 static Klass* check_klass(Klass* k) { |
| 0 | 391 assert(k != NULL, "preloaded klass not initialized"); |
| 392 return k; | |
| 393 } | |
| 394 | |
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395 static Klass* check_klass_Pre(Klass* k) { return check_klass(k); } |
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396 static Klass* check_klass_Pre_JSR292(Klass* k) { return EnableInvokeDynamic ? check_klass(k) : k; } |
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397 static Klass* check_klass_Opt(Klass* k) { return k; } |
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398 static Klass* check_klass_Opt_Kernel(Klass* k) { return k; } //== Opt |
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399 static Klass* check_klass_Opt_Only_JDK15(Klass* k) { |
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400 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only"); |
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401 return k; |
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402 } |
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403 static Klass* check_klass_Opt_Only_JDK14NewRef(Klass* k) { |
| 0 | 404 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only"); |
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405 // despite the optional loading, if you use this it must be present: |
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406 return check_klass(k); |
| 0 | 407 } |
| 408 | |
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409 static bool initialize_wk_klass(WKID id, int init_opt, TRAPS); |
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410 static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS); |
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411 static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) { |
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412 int limit = (int)end_id + 1; |
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413 initialize_wk_klasses_until((WKID) limit, start_id, THREAD); |
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414 } |
| 0 | 415 |
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416 public: |
| 3938 | 417 #define WK_KLASS_DECLARE(name, symbol, option) \ |
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418 static Klass* name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } \ |
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419 static Klass** name##_addr() { \ |
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420 return &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \ |
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421 } |
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422 WK_KLASSES_DO(WK_KLASS_DECLARE); |
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423 #undef WK_KLASS_DECLARE |
| 0 | 424 |
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425 static Klass* well_known_klass(WKID id) { |
| 3938 | 426 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
| 427 return _well_known_klasses[id]; | |
| 428 } | |
| 429 | |
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430 static Klass** well_known_klass_addr(WKID id) { |
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431 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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432 return &_well_known_klasses[id]; |
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433 } |
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434 |
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435 // Local definition for direct access to the private array: |
| 147 | 436 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)] |
| 0 | 437 |
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438 static Klass* box_klass(BasicType t) { |
| 0 | 439 assert((uint)t < T_VOID+1, "range check"); |
| 440 return check_klass(_box_klasses[t]); | |
| 441 } | |
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442 static BasicType box_klass_type(Klass* k); // inverse of box_klass |
| 0 | 443 |
| 444 // methods returning lazily loaded klasses | |
| 445 // The corresponding method to load the class must be called before calling them. | |
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446 static Klass* abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); } |
| 0 | 447 |
| 448 static void load_abstract_ownable_synchronizer_klass(TRAPS); | |
| 449 | |
| 450 private: | |
| 451 // Tells whether ClassLoader.loadClassInternal is present | |
| 452 static bool has_loadClassInternal() { return _has_loadClassInternal; } | |
| 453 | |
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454 // Returns the class loader data to be used when looking up/updating the |
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455 // system dictionary. |
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456 static ClassLoaderData *class_loader_data(Handle class_loader) { |
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457 return ClassLoaderData::class_loader_data(class_loader()); |
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458 } |
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459 |
| 0 | 460 public: |
| 461 // Tells whether ClassLoader.checkPackageAccess is present | |
| 462 static bool has_checkPackageAccess() { return _has_checkPackageAccess; } | |
| 463 | |
| 1142 | 464 static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; } |
| 465 static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; } | |
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466 static bool Object_klass_loaded() { return WK_KLASS(Object_klass) != NULL; } |
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467 static bool ClassLoader_klass_loaded() { return WK_KLASS(ClassLoader_klass) != NULL; } |
| 0 | 468 |
| 469 // Returns default system loader | |
| 470 static oop java_system_loader(); | |
| 471 | |
| 472 // Compute the default system loader | |
| 473 static void compute_java_system_loader(TRAPS); | |
| 474 | |
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475 // Register a new class loader |
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476 static ClassLoaderData* register_loader(Handle class_loader); |
| 0 | 477 private: |
| 478 // Mirrors for primitive classes (created eagerly) | |
| 479 static oop check_mirror(oop m) { | |
| 480 assert(m != NULL, "mirror not initialized"); | |
| 481 return m; | |
| 482 } | |
| 483 | |
| 484 public: | |
| 485 // Note: java_lang_Class::primitive_type is the inverse of java_mirror | |
| 486 | |
| 487 // Check class loader constraints | |
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488 static bool add_loader_constraint(Symbol* name, Handle loader1, |
| 0 | 489 Handle loader2, TRAPS); |
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490 static char* check_signature_loaders(Symbol* signature, Handle loader1, |
| 0 | 491 Handle loader2, bool is_method, TRAPS); |
| 492 | |
| 710 | 493 // JSR 292 |
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494 // find a java.lang.invoke.MethodHandle.invoke* method for a given signature |
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495 // (asks Java to compute it if necessary, except in a compiler thread) |
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496 static methodHandle find_method_handle_invoker(Symbol* name, |
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497 Symbol* signature, |
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498 KlassHandle accessing_klass, |
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499 Handle *appendix_result, |
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500 TRAPS); |
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501 // for a given signature, find the internal MethodHandle method (linkTo* or invokeBasic) |
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502 // (does not ask Java, since this is a low-level intrinsic defined by the JVM) |
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503 static methodHandle find_method_handle_intrinsic(vmIntrinsics::ID iid, |
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504 Symbol* signature, |
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505 TRAPS); |
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506 // find a java.lang.invoke.MethodType object for a given signature |
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507 // (asks Java to compute it if necessary, except in a compiler thread) |
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508 static Handle find_method_handle_type(Symbol* signature, |
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509 KlassHandle accessing_klass, |
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510 TRAPS); |
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511 |
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512 // ask Java to compute a java.lang.invoke.MethodHandle object for a given CP entry |
| 1602 | 513 static Handle link_method_handle_constant(KlassHandle caller, |
| 514 int ref_kind, //e.g., JVM_REF_invokeVirtual | |
| 515 KlassHandle callee, | |
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516 Symbol* name, |
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517 Symbol* signature, |
| 1602 | 518 TRAPS); |
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519 |
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520 // ask Java to create a dynamic call site, while linking an invokedynamic op |
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521 static methodHandle find_dynamic_call_site_invoker(KlassHandle caller, |
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522 Handle bootstrap_method, |
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523 Symbol* name, |
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524 Symbol* type, |
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525 Handle *appendix_result, |
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526 TRAPS); |
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527 |
| 0 | 528 // Utility for printing loader "name" as part of tracing constraints |
| 529 static const char* loader_name(oop loader) { | |
| 530 return ((loader) == NULL ? "<bootloader>" : | |
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531 InstanceKlass::cast((loader)->klass())->name()->as_C_string() ); |
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532 } |
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533 static const char* loader_name(ClassLoaderData* loader_data) { |
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534 return (loader_data->is_the_null_class_loader_data() ? "<bootloader>" : |
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535 InstanceKlass::cast((loader_data->class_loader())->klass())->name()->as_C_string() ); |
| 0 | 536 } |
| 537 | |
| 538 // Record the error when the first attempt to resolve a reference from a constant | |
| 539 // pool entry to a class fails. | |
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540 static void add_resolution_error(constantPoolHandle pool, int which, Symbol* error); |
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541 static void delete_resolution_error(ConstantPool* pool); |
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542 static Symbol* find_resolution_error(constantPoolHandle pool, int which); |
| 0 | 543 |
| 544 private: | |
| 545 | |
| 546 enum Constants { | |
| 547 _loader_constraint_size = 107, // number of entries in constraint table | |
| 548 _resolution_error_size = 107, // number of entries in resolution error table | |
| 710 | 549 _invoke_method_size = 139, // number of entries in invoke method table |
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550 _nof_buckets = 1009, // number of buckets in hash table for placeholders |
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551 _old_default_sdsize = 1009, // backward compat for system dictionary size |
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552 _prime_array_size = 8, // array of primes for system dictionary size |
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553 _average_depth_goal = 3 // goal for lookup length |
| 0 | 554 }; |
| 555 | |
| 556 | |
| 557 // Static variables | |
| 558 | |
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559 // hashtable sizes for system dictionary to allow growth |
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560 // prime numbers for system dictionary size |
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561 static int _sdgeneration; |
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562 static const int _primelist[_prime_array_size]; |
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563 |
| 0 | 564 // Hashtable holding loaded classes. |
| 565 static Dictionary* _dictionary; | |
| 566 | |
| 567 // Hashtable holding placeholders for classes being loaded. | |
| 568 static PlaceholderTable* _placeholders; | |
| 569 | |
| 570 // Hashtable holding classes from the shared archive. | |
| 571 static Dictionary* _shared_dictionary; | |
| 572 | |
| 573 // Monotonically increasing counter which grows with | |
| 574 // _number_of_classes as well as hot-swapping and breakpoint setting | |
| 575 // and removal. | |
| 576 static int _number_of_modifications; | |
| 577 | |
| 578 // Lock object for system class loader | |
| 579 static oop _system_loader_lock_obj; | |
| 580 | |
| 581 // Constraints on class loaders | |
| 582 static LoaderConstraintTable* _loader_constraints; | |
| 583 | |
| 584 // Resolution errors | |
| 585 static ResolutionErrorTable* _resolution_errors; | |
| 586 | |
| 710 | 587 // Invoke methods (JSR 292) |
| 588 static SymbolPropertyTable* _invoke_method_table; | |
| 589 | |
| 0 | 590 public: |
| 591 // for VM_CounterDecay iteration support | |
| 592 friend class CounterDecay; | |
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593 static Klass* try_get_next_class(); |
| 0 | 594 |
| 595 private: | |
| 596 static void validate_protection_domain(instanceKlassHandle klass, | |
| 597 Handle class_loader, | |
| 598 Handle protection_domain, TRAPS); | |
| 599 | |
| 600 friend class VM_PopulateDumpSharedSpace; | |
| 601 friend class TraversePlaceholdersClosure; | |
| 602 static Dictionary* dictionary() { return _dictionary; } | |
| 603 static Dictionary* shared_dictionary() { return _shared_dictionary; } | |
| 604 static PlaceholderTable* placeholders() { return _placeholders; } | |
| 605 static LoaderConstraintTable* constraints() { return _loader_constraints; } | |
| 606 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; } | |
| 710 | 607 static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; } |
| 0 | 608 |
| 609 // Basic loading operations | |
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610 static Klass* resolve_instance_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
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611 static Klass* resolve_array_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
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612 static instanceKlassHandle handle_parallel_super_load(Symbol* class_name, Symbol* supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS); |
| 0 | 613 // Wait on SystemDictionary_lock; unlocks lockObject before |
| 614 // waiting; relocks lockObject with correct recursion count | |
| 615 // after waiting, but before reentering SystemDictionary_lock | |
| 616 // to preserve lock order semantics. | |
| 617 static void double_lock_wait(Handle lockObject, TRAPS); | |
| 618 static void define_instance_class(instanceKlassHandle k, TRAPS); | |
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619 static instanceKlassHandle find_or_define_instance_class(Symbol* class_name, |
| 0 | 620 Handle class_loader, |
| 621 instanceKlassHandle k, TRAPS); | |
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622 static instanceKlassHandle load_shared_class(Symbol* class_name, |
| 0 | 623 Handle class_loader, TRAPS); |
| 624 static instanceKlassHandle load_shared_class(instanceKlassHandle ik, | |
| 625 Handle class_loader, TRAPS); | |
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626 static instanceKlassHandle load_instance_class(Symbol* class_name, Handle class_loader, TRAPS); |
| 0 | 627 static Handle compute_loader_lock_object(Handle class_loader, TRAPS); |
| 628 static void check_loader_lock_contention(Handle loader_lock, TRAPS); | |
| 514 | 629 static bool is_parallelCapable(Handle class_loader); |
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630 static bool is_parallelDefine(Handle class_loader); |
| 0 | 631 |
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632 static Klass* find_shared_class(Symbol* class_name); |
| 0 | 633 |
| 634 // Setup link to hierarchy | |
| 635 static void add_to_hierarchy(instanceKlassHandle k, TRAPS); | |
| 636 | |
| 637 private: | |
| 638 // We pass in the hashtable index so we can calculate it outside of | |
| 639 // the SystemDictionary_lock. | |
| 640 | |
| 641 // Basic find on loaded classes | |
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642 static Klass* find_class(int index, unsigned int hash, |
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643 Symbol* name, ClassLoaderData* loader_data); |
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644 static Klass* find_class(Symbol* class_name, ClassLoaderData* loader_data); |
| 0 | 645 |
| 646 // Basic find on classes in the midst of being loaded | |
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647 static Symbol* find_placeholder(Symbol* name, ClassLoaderData* loader_data); |
| 0 | 648 |
| 649 // Updating entry in dictionary | |
| 650 // Add a completely loaded class | |
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651 static void add_klass(int index, Symbol* class_name, |
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652 ClassLoaderData* loader_data, KlassHandle obj); |
| 0 | 653 |
| 654 // Add a placeholder for a class being loaded | |
| 655 static void add_placeholder(int index, | |
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656 Symbol* class_name, |
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657 ClassLoaderData* loader_data); |
| 0 | 658 static void remove_placeholder(int index, |
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659 Symbol* class_name, |
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660 ClassLoaderData* loader_data); |
| 0 | 661 |
| 662 // Performs cleanups after resolve_super_or_fail. This typically needs | |
| 663 // to be called on failure. | |
| 664 // Won't throw, but can block. | |
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665 static void resolution_cleanups(Symbol* class_name, |
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666 ClassLoaderData* loader_data, |
| 0 | 667 TRAPS); |
| 668 | |
| 669 // Initialization | |
| 670 static void initialize_preloaded_classes(TRAPS); | |
| 671 | |
| 672 // Class loader constraints | |
| 673 static void check_constraints(int index, unsigned int hash, | |
| 674 instanceKlassHandle k, Handle loader, | |
| 675 bool defining, TRAPS); | |
| 676 static void update_dictionary(int d_index, unsigned int d_hash, | |
| 677 int p_index, unsigned int p_hash, | |
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678 instanceKlassHandle k, Handle loader, |
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679 TRAPS); |
| 0 | 680 |
| 681 // Variables holding commonly used klasses (preloaded) | |
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682 static Klass* _well_known_klasses[]; |
| 0 | 683 |
| 684 // Lazily loaded klasses | |
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685 static Klass* volatile _abstract_ownable_synchronizer_klass; |
| 0 | 686 |
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687 // table of box klasses (int_klass, etc.) |
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688 static Klass* _box_klasses[T_VOID+1]; |
| 0 | 689 |
| 690 static oop _java_system_loader; | |
| 691 | |
| 692 static bool _has_loadClassInternal; | |
| 693 static bool _has_checkPackageAccess; | |
| 694 }; | |
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695 |
| 1972 | 696 #endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP |