annotate src/share/vm/classfile/systemDictionary.hpp @ 6875: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
duke@0 1 /*
coleenp@5881 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
duke@0 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@0 4 *
duke@0 5 * This code is free software; you can redistribute it and/or modify it
duke@0 6 * under the terms of the GNU General Public License version 2 only, as
duke@0 7 * published by the Free Software Foundation.
duke@0 8 *
duke@0 9 * This code is distributed in the hope that it will be useful, but WITHOUT
duke@0 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@0 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@0 12 * version 2 for more details (a copy is included in the LICENSE file that
duke@0 13 * accompanied this code).
duke@0 14 *
duke@0 15 * You should have received a copy of the GNU General Public License version
duke@0 16 * 2 along with this work; if not, write to the Free Software Foundation,
duke@0 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@0 18 *
trims@1472 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1472 20 * or visit www.oracle.com if you need additional information or have any
trims@1472 21 * questions.
duke@0 22 *
duke@0 23 */
duke@0 24
stefank@1879 25 #ifndef SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP
stefank@1879 26 #define SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP
stefank@1879 27
stefank@1879 28 #include "classfile/classFileStream.hpp"
stefank@1879 29 #include "classfile/classLoader.hpp"
stefank@1879 30 #include "oops/objArrayOop.hpp"
coleenp@2062 31 #include "oops/symbol.hpp"
stefank@1879 32 #include "runtime/java.hpp"
stefank@1879 33 #include "runtime/reflectionUtils.hpp"
stefank@1879 34 #include "utilities/hashtable.hpp"
zgu@3465 35 #include "utilities/hashtable.inline.hpp"
stefank@1879 36
sla@4802 37
duke@0 38 // The system dictionary stores all loaded classes and maps:
duke@0 39 //
coleenp@3602 40 // [class name,class loader] -> class i.e. [Symbol*,oop] -> Klass*
duke@0 41 //
duke@0 42 // Classes are loaded lazily. The default VM class loader is
duke@0 43 // represented as NULL.
duke@0 44
duke@0 45 // The underlying data structure is an open hash table with a fixed number
duke@0 46 // of buckets. During loading the loader object is locked, (for the VM loader
duke@0 47 // a private lock object is used). Class loading can thus be done concurrently,
duke@0 48 // but only by different loaders.
duke@0 49 //
duke@0 50 // During loading a placeholder (name, loader) is temporarily placed in
duke@0 51 // a side data structure, and is used to detect ClassCircularityErrors
duke@0 52 // and to perform verification during GC. A GC can occur in the midst
duke@0 53 // of class loading, as we call out to Java, have to take locks, etc.
duke@0 54 //
duke@0 55 // When class loading is finished, a new entry is added to the system
duke@0 56 // dictionary and the place holder is removed. Note that the protection
duke@0 57 // domain field of the system dictionary has not yet been filled in when
duke@0 58 // the "real" system dictionary entry is created.
duke@0 59 //
duke@0 60 // Clients of this class who are interested in finding if a class has
duke@0 61 // been completely loaded -- not classes in the process of being loaded --
duke@0 62 // can read the SystemDictionary unlocked. This is safe because
duke@0 63 // - entries are only deleted at safepoints
duke@0 64 // - readers cannot come to a safepoint while actively examining
duke@0 65 // an entry (an entry cannot be deleted from under a reader)
duke@0 66 // - entries must be fully formed before they are available to concurrent
duke@0 67 // readers (we must ensure write ordering)
duke@0 68 //
duke@0 69 // Note that placeholders are deleted at any time, as they are removed
duke@0 70 // when a class is completely loaded. Therefore, readers as well as writers
duke@0 71 // of placeholders must hold the SystemDictionary_lock.
duke@0 72 //
duke@0 73
duke@0 74 class Dictionary;
duke@0 75 class PlaceholderTable;
duke@0 76 class LoaderConstraintTable;
zgu@3465 77 template <MEMFLAGS F> class HashtableBucket;
duke@0 78 class ResolutionErrorTable;
jrose@710 79 class SymbolPropertyTable;
mgronlun@5696 80 class Ticks;
duke@0 81
jrose@132 82 // Certain classes are preloaded, such as java.lang.Object and java.lang.String.
jrose@132 83 // They are all "well-known", in the sense that no class loader is allowed
jrose@132 84 // to provide a different definition.
jrose@132 85 //
jrose@132 86 // These klasses must all have names defined in vmSymbols.
jrose@132 87
jrose@132 88 #define WK_KLASS_ENUM_NAME(kname) kname##_knum
jrose@132 89
jrose@132 90 // Each well-known class has a short klass name (like object_klass),
jrose@132 91 // a vmSymbol name (like java_lang_Object), and a flag word
jrose@132 92 // that makes some minor distinctions, like whether the klass
jrose@132 93 // is preloaded, optional, release-specific, etc.
jrose@132 94 // The order of these definitions is significant; it is the order in which
jrose@132 95 // preloading is actually performed by initialize_preloaded_classes.
jrose@132 96
twisti@3723 97 #define WK_KLASSES_DO(do_klass) \
twisti@3723 98 /* well-known classes */ \
twisti@3728 99 do_klass(Object_klass, java_lang_Object, Pre ) \
twisti@3728 100 do_klass(String_klass, java_lang_String, Pre ) \
twisti@3728 101 do_klass(Class_klass, java_lang_Class, Pre ) \
twisti@3728 102 do_klass(Cloneable_klass, java_lang_Cloneable, Pre ) \
twisti@3728 103 do_klass(ClassLoader_klass, java_lang_ClassLoader, Pre ) \
twisti@3728 104 do_klass(Serializable_klass, java_io_Serializable, Pre ) \
twisti@3728 105 do_klass(System_klass, java_lang_System, Pre ) \
twisti@3728 106 do_klass(Throwable_klass, java_lang_Throwable, Pre ) \
twisti@3728 107 do_klass(Error_klass, java_lang_Error, Pre ) \
twisti@3728 108 do_klass(ThreadDeath_klass, java_lang_ThreadDeath, Pre ) \
twisti@3728 109 do_klass(Exception_klass, java_lang_Exception, Pre ) \
twisti@3728 110 do_klass(RuntimeException_klass, java_lang_RuntimeException, Pre ) \
twisti@4431 111 do_klass(SecurityManager_klass, java_lang_SecurityManager, Pre ) \
twisti@3728 112 do_klass(ProtectionDomain_klass, java_security_ProtectionDomain, Pre ) \
twisti@3728 113 do_klass(AccessControlContext_klass, java_security_AccessControlContext, Pre ) \
iklam@6573 114 do_klass(SecureClassLoader_klass, java_security_SecureClassLoader, Pre ) \
twisti@3728 115 do_klass(ClassNotFoundException_klass, java_lang_ClassNotFoundException, Pre ) \
twisti@3728 116 do_klass(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre ) \
twisti@3728 117 do_klass(LinkageError_klass, java_lang_LinkageError, Pre ) \
twisti@3728 118 do_klass(ClassCastException_klass, java_lang_ClassCastException, Pre ) \
twisti@3728 119 do_klass(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre ) \
twisti@3728 120 do_klass(VirtualMachineError_klass, java_lang_VirtualMachineError, Pre ) \
twisti@3728 121 do_klass(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre ) \
twisti@3728 122 do_klass(StackOverflowError_klass, java_lang_StackOverflowError, Pre ) \
twisti@3728 123 do_klass(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre ) \
twisti@3728 124 do_klass(Reference_klass, java_lang_ref_Reference, Pre ) \
twisti@3723 125 \
twisti@3723 126 /* Preload ref klasses and set reference types */ \
twisti@3728 127 do_klass(SoftReference_klass, java_lang_ref_SoftReference, Pre ) \
twisti@3728 128 do_klass(WeakReference_klass, java_lang_ref_WeakReference, Pre ) \
twisti@3723 129 do_klass(FinalReference_klass, java_lang_ref_FinalReference, Pre ) \
twisti@3728 130 do_klass(PhantomReference_klass, java_lang_ref_PhantomReference, Pre ) \
twisti@3723 131 do_klass(Finalizer_klass, java_lang_ref_Finalizer, Pre ) \
twisti@3723 132 \
twisti@3728 133 do_klass(Thread_klass, java_lang_Thread, Pre ) \
twisti@3728 134 do_klass(ThreadGroup_klass, java_lang_ThreadGroup, Pre ) \
twisti@3728 135 do_klass(Properties_klass, java_util_Properties, Pre ) \
twisti@3728 136 do_klass(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject, Pre ) \
twisti@3728 137 do_klass(reflect_Field_klass, java_lang_reflect_Field, Pre ) \
coleenp@3963 138 do_klass(reflect_Parameter_klass, java_lang_reflect_Parameter, Opt ) \
twisti@3728 139 do_klass(reflect_Method_klass, java_lang_reflect_Method, Pre ) \
twisti@3728 140 do_klass(reflect_Constructor_klass, java_lang_reflect_Constructor, Pre ) \
twisti@3723 141 \
never@2702 142 /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \
never@2702 143 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
never@2702 144 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
twisti@3723 145 do_klass(reflect_MagicAccessorImpl_klass, sun_reflect_MagicAccessorImpl, Opt ) \
twisti@3723 146 do_klass(reflect_MethodAccessorImpl_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \
twisti@3723 147 do_klass(reflect_ConstructorAccessorImpl_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \
twisti@3723 148 do_klass(reflect_DelegatingClassLoader_klass, sun_reflect_DelegatingClassLoader, Opt ) \
twisti@3723 149 do_klass(reflect_ConstantPool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15 ) \
twisti@3723 150 do_klass(reflect_UnsafeStaticFieldAccessorImpl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15 ) \
twisti@4431 151 do_klass(reflect_CallerSensitive_klass, sun_reflect_CallerSensitive, Opt ) \
twisti@3723 152 \
twisti@3723 153 /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \
sspitsyn@5061 154 do_klass(DirectMethodHandle_klass, java_lang_invoke_DirectMethodHandle, Opt ) \
twisti@3728 155 do_klass(MethodHandle_klass, java_lang_invoke_MethodHandle, Pre_JSR292 ) \
twisti@3728 156 do_klass(MemberName_klass, java_lang_invoke_MemberName, Pre_JSR292 ) \
twisti@3728 157 do_klass(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives, Pre_JSR292 ) \
twisti@3723 158 do_klass(LambdaForm_klass, java_lang_invoke_LambdaForm, Opt ) \
twisti@3728 159 do_klass(MethodType_klass, java_lang_invoke_MethodType, Pre_JSR292 ) \
twisti@3728 160 do_klass(BootstrapMethodError_klass, java_lang_BootstrapMethodError, Pre_JSR292 ) \
twisti@3728 161 do_klass(CallSite_klass, java_lang_invoke_CallSite, Pre_JSR292 ) \
twisti@3728 162 do_klass(ConstantCallSite_klass, java_lang_invoke_ConstantCallSite, Pre_JSR292 ) \
twisti@3728 163 do_klass(MutableCallSite_klass, java_lang_invoke_MutableCallSite, Pre_JSR292 ) \
twisti@3728 164 do_klass(VolatileCallSite_klass, java_lang_invoke_VolatileCallSite, Pre_JSR292 ) \
twisti@3723 165 /* Note: MethodHandle must be first, and VolatileCallSite last in group */ \
twisti@3723 166 \
twisti@3728 167 do_klass(StringBuffer_klass, java_lang_StringBuffer, Pre ) \
twisti@3728 168 do_klass(StringBuilder_klass, java_lang_StringBuilder, Pre ) \
drchase@5699 169 do_klass(misc_Unsafe_klass, sun_misc_Unsafe, Pre ) \
twisti@3723 170 \
iklam@6573 171 /* support for CDS */ \
iklam@6573 172 do_klass(ByteArrayInputStream_klass, java_io_ByteArrayInputStream, Pre ) \
iklam@6573 173 do_klass(File_klass, java_io_File, Pre ) \
iklam@6573 174 do_klass(URLClassLoader_klass, java_net_URLClassLoader, Pre ) \
iklam@6573 175 do_klass(URL_klass, java_net_URL, Pre ) \
iklam@6573 176 do_klass(Jar_Manifest_klass, java_util_jar_Manifest, Pre ) \
iklam@6573 177 do_klass(sun_misc_Launcher_klass, sun_misc_Launcher, Pre ) \
iklam@6864 178 do_klass(sun_misc_Launcher_AppClassLoader_klass, sun_misc_Launcher_AppClassLoader, Pre ) \
iklam@6864 179 do_klass(sun_misc_Launcher_ExtClassLoader_klass, sun_misc_Launcher_ExtClassLoader, Pre ) \
iklam@6573 180 do_klass(CodeSource_klass, java_security_CodeSource, Pre ) \
iklam@6573 181 \
twisti@3723 182 /* It's NULL in non-1.4 JDKs. */ \
twisti@3723 183 do_klass(StackTraceElement_klass, java_lang_StackTraceElement, Opt ) \
twisti@3723 184 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
twisti@3723 185 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
twisti@3723 186 do_klass(nio_Buffer_klass, java_nio_Buffer, Opt ) \
twisti@3723 187 \
twisti@3723 188 /* Preload boxing klasses */ \
twisti@3728 189 do_klass(Boolean_klass, java_lang_Boolean, Pre ) \
twisti@3728 190 do_klass(Character_klass, java_lang_Character, Pre ) \
twisti@3728 191 do_klass(Float_klass, java_lang_Float, Pre ) \
twisti@3728 192 do_klass(Double_klass, java_lang_Double, Pre ) \
twisti@3728 193 do_klass(Byte_klass, java_lang_Byte, Pre ) \
twisti@3728 194 do_klass(Short_klass, java_lang_Short, Pre ) \
twisti@3728 195 do_klass(Integer_klass, java_lang_Integer, Pre ) \
twisti@3728 196 do_klass(Long_klass, java_lang_Long, Pre ) \
jrose@132 197 /*end*/
jrose@132 198
jrose@132 199
duke@0 200 class SystemDictionary : AllStatic {
duke@0 201 friend class VMStructs;
jrose@665 202 friend class SystemDictionaryHandles;
duke@0 203
duke@0 204 public:
jrose@132 205 enum WKID {
jrose@132 206 NO_WKID = 0,
jrose@132 207
never@2702 208 #define WK_KLASS_ENUM(name, symbol, ignore_o) WK_KLASS_ENUM_NAME(name), WK_KLASS_ENUM_NAME(symbol) = WK_KLASS_ENUM_NAME(name),
jrose@132 209 WK_KLASSES_DO(WK_KLASS_ENUM)
jrose@132 210 #undef WK_KLASS_ENUM
jrose@132 211
jrose@132 212 WKID_LIMIT,
jrose@132 213
jrose@132 214 FIRST_WKID = NO_WKID + 1
jrose@132 215 };
jrose@132 216
jrose@132 217 enum InitOption {
jrose@132 218 Pre, // preloaded; error if not present
twisti@3728 219 Pre_JSR292, // preloaded if EnableInvokeDynamic
jrose@132 220
jrose@132 221 // Order is significant. Options before this point require resolve_or_fail.
jrose@132 222 // Options after this point will use resolve_or_null instead.
jrose@132 223
jrose@132 224 Opt, // preload tried; NULL if not present
jrose@132 225 Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection
jrose@132 226 Opt_Only_JDK15, // preload tried; use only with JDK1.5+
jrose@132 227 OPTION_LIMIT,
jrose@132 228 CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT)
jrose@132 229 };
jrose@132 230
jrose@132 231
duke@0 232 // Returns a class with a given class name and class loader. Loads the
duke@0 233 // class if needed. If not found a NoClassDefFoundError or a
duke@0 234 // ClassNotFoundException is thrown, depending on the value on the
duke@0 235 // throw_error flag. For most uses the throw_error argument should be set
duke@0 236 // to true.
duke@0 237
coleenp@3602 238 static Klass* resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS);
duke@0 239 // Convenient call for null loader and protection domain.
coleenp@3602 240 static Klass* resolve_or_fail(Symbol* class_name, bool throw_error, TRAPS);
iklam@6573 241 protected:
duke@0 242 // handle error translation for resolve_or_null results
coleenp@3602 243 static Klass* handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS);
duke@0 244
duke@0 245 public:
duke@0 246
duke@0 247 // Returns a class with a given class name and class loader.
duke@0 248 // Loads the class if needed. If not found NULL is returned.
coleenp@3602 249 static Klass* resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
duke@0 250 // Version with null loader and protection domain
coleenp@3602 251 static Klass* resolve_or_null(Symbol* class_name, TRAPS);
duke@0 252
duke@0 253 // Resolve a superclass or superinterface. Called from ClassFileParser,
duke@0 254 // parse_interfaces, resolve_instance_class_or_null, load_shared_class
duke@0 255 // "child_name" is the class whose super class or interface is being resolved.
coleenp@3602 256 static Klass* resolve_super_or_fail(Symbol* child_name,
coleenp@2062 257 Symbol* class_name,
duke@0 258 Handle class_loader,
duke@0 259 Handle protection_domain,
duke@0 260 bool is_superclass,
duke@0 261 TRAPS);
duke@0 262
duke@0 263 // Parse new stream. This won't update the system dictionary or
duke@0 264 // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses.
coleenp@3602 265 static Klass* parse_stream(Symbol* class_name,
duke@0 266 Handle class_loader,
duke@0 267 Handle protection_domain,
duke@0 268 ClassFileStream* st,
jrose@431 269 TRAPS) {
jrose@431 270 KlassHandle nullHandle;
jrose@431 271 return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD);
jrose@431 272 }
coleenp@3602 273 static Klass* parse_stream(Symbol* class_name,
jrose@431 274 Handle class_loader,
jrose@431 275 Handle protection_domain,
jrose@431 276 ClassFileStream* st,
jrose@431 277 KlassHandle host_klass,
jrose@431 278 GrowableArray<Handle>* cp_patches,
duke@0 279 TRAPS);
duke@0 280
duke@0 281 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass)
coleenp@3602 282 static Klass* resolve_from_stream(Symbol* class_name, Handle class_loader,
acorn@973 283 Handle protection_domain,
acorn@973 284 ClassFileStream* st, bool verify, TRAPS);
duke@0 285
duke@0 286 // Lookup an already loaded class. If not found NULL is returned.
coleenp@3602 287 static Klass* find(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
duke@0 288
duke@0 289 // Lookup an already loaded instance or array class.
duke@0 290 // Do not make any queries to class loaders; consult only the cache.
duke@0 291 // If not found NULL is returned.
coleenp@3602 292 static Klass* find_instance_or_array_klass(Symbol* class_name,
duke@0 293 Handle class_loader,
duke@0 294 Handle protection_domain,
duke@0 295 TRAPS);
duke@0 296
duke@0 297 // Lookup an instance or array class that has already been loaded
duke@0 298 // either into the given class loader, or else into another class
duke@0 299 // loader that is constrained (via loader constraints) to produce
duke@0 300 // a consistent class. Do not take protection domains into account.
duke@0 301 // Do not make any queries to class loaders; consult only the cache.
duke@0 302 // Return NULL if the class is not found.
duke@0 303 //
duke@0 304 // This function is a strict superset of find_instance_or_array_klass.
duke@0 305 // This function (the unchecked version) makes a conservative prediction
duke@0 306 // of the result of the checked version, assuming successful lookup.
duke@0 307 // If both functions return non-null, they must return the same value.
duke@0 308 // Also, the unchecked version may sometimes be non-null where the
duke@0 309 // checked version is null. This can occur in several ways:
duke@0 310 // 1. No query has yet been made to the class loader.
duke@0 311 // 2. The class loader was queried, but chose not to delegate.
duke@0 312 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain.
duke@0 313 // 4. Loading was attempted, but there was a linkage error of some sort.
duke@0 314 // In all of these cases, the loader constraints on this type are
duke@0 315 // satisfied, and it is safe for classes in the given class loader
duke@0 316 // to manipulate strongly-typed values of the found class, subject
duke@0 317 // to local linkage and access checks.
coleenp@3602 318 static Klass* find_constrained_instance_or_array_klass(Symbol* class_name,
duke@0 319 Handle class_loader,
duke@0 320 TRAPS);
duke@0 321
duke@0 322 // Iterate over all klasses in dictionary
duke@0 323 // Just the classes from defining class loaders
coleenp@3602 324 static void classes_do(void f(Klass*));
duke@0 325 // Added for initialize_itable_for_klass to handle exceptions
coleenp@3602 326 static void classes_do(void f(Klass*, TRAPS), TRAPS);
duke@0 327 // All classes, and their class loaders
coleenp@3602 328 static void classes_do(void f(Klass*, ClassLoaderData*));
coleenp@4665 329
coleenp@3602 330 static void placeholders_do(void f(Symbol*));
duke@0 331
duke@0 332 // Iterate over all methods in all klasses in dictionary
coleenp@3602 333 static void methods_do(void f(Method*));
duke@0 334
duke@0 335 // Garbage collection support
duke@0 336
duke@0 337 // This method applies "blk->do_oop" to all the pointers to "system"
duke@0 338 // classes and loaders.
duke@0 339 static void always_strong_oops_do(OopClosure* blk);
coleenp@3602 340 static void always_strong_classes_do(KlassClosure* closure);
duke@0 341
duke@0 342 // Unload (that is, break root links to) all unmarked classes and
duke@0 343 // loaders. Returns "true" iff something was unloaded.
stefank@6875 344 static bool do_unloading(BoolObjectClosure* is_alive, bool clean_alive = true);
duke@0 345
iklam@6573 346 // Used by DumpSharedSpaces only to remove classes that failed verification
iklam@6573 347 static void remove_classes_in_error_state();
iklam@6573 348
acorn@3056 349 static int calculate_systemdictionary_size(int loadedclasses);
acorn@3056 350
duke@0 351 // Applies "f->do_oop" to all root oops in the system dictionary.
duke@0 352 static void oops_do(OopClosure* f);
stefank@6465 353 static void roots_oops_do(OopClosure* strong, OopClosure* weak);
duke@0 354
duke@0 355 // System loader lock
duke@0 356 static oop system_loader_lock() { return _system_loader_lock_obj; }
duke@0 357
iklam@6573 358 protected:
coleenp@3602 359 // Extended Redefine classes support (tbi)
coleenp@3602 360 static void preloaded_classes_do(KlassClosure* f);
coleenp@3602 361 static void lazily_loaded_classes_do(KlassClosure* f);
duke@0 362 public:
duke@0 363 // Sharing support.
duke@0 364 static void reorder_dictionary();
duke@0 365 static void copy_buckets(char** top, char* end);
duke@0 366 static void copy_table(char** top, char* end);
duke@0 367 static void reverse();
zgu@3465 368 static void set_shared_dictionary(HashtableBucket<mtClass>* t, int length,
duke@0 369 int number_of_entries);
duke@0 370 // Printing
iklam@6573 371 static void print(bool details = true);
iklam@6573 372 static void print_shared(bool details = true);
duke@0 373 static void print_class_statistics() PRODUCT_RETURN;
duke@0 374 static void print_method_statistics() PRODUCT_RETURN;
duke@0 375
duke@0 376 // Number of contained klasses
duke@0 377 // This is both fully loaded classes and classes in the process
duke@0 378 // of being loaded
duke@0 379 static int number_of_classes();
duke@0 380
duke@0 381 // Monotonically increasing counter which grows as classes are
duke@0 382 // loaded or modifications such as hot-swapping or setting/removing
duke@0 383 // of breakpoints are performed
duke@0 384 static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; }
duke@0 385 // Needed by evolution and breakpoint code
duke@0 386 static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; }
duke@0 387
duke@0 388 // Verification
duke@0 389 static void verify();
duke@0 390
duke@0 391 #ifdef ASSERT
coleenp@2062 392 static bool is_internal_format(Symbol* class_name);
duke@0 393 #endif
duke@0 394
duke@0 395 // Initialization
duke@0 396 static void initialize(TRAPS);
duke@0 397
duke@0 398 // Fast access to commonly used classes (preloaded)
coleenp@3602 399 static Klass* check_klass(Klass* k) {
duke@0 400 assert(k != NULL, "preloaded klass not initialized");
duke@0 401 return k;
duke@0 402 }
duke@0 403
twisti@3723 404 static Klass* check_klass_Pre( Klass* k) { return check_klass(k); }
twisti@3728 405 static Klass* check_klass_Pre_JSR292(Klass* k) { return EnableInvokeDynamic ? check_klass(k) : k; }
twisti@3723 406 static Klass* check_klass_Opt( Klass* k) { return k; }
coleenp@3602 407 static Klass* check_klass_Opt_Only_JDK15(Klass* k) {
jrose@132 408 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only");
jrose@132 409 return k;
jrose@132 410 }
coleenp@3602 411 static Klass* check_klass_Opt_Only_JDK14NewRef(Klass* k) {
duke@0 412 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only");
jrose@132 413 // despite the optional loading, if you use this it must be present:
jrose@132 414 return check_klass(k);
duke@0 415 }
duke@0 416
jrose@132 417 static bool initialize_wk_klass(WKID id, int init_opt, TRAPS);
jrose@132 418 static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS);
jrose@132 419 static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) {
jrose@132 420 int limit = (int)end_id + 1;
jrose@132 421 initialize_wk_klasses_until((WKID) limit, start_id, THREAD);
jrose@132 422 }
duke@0 423
jrose@132 424 public:
never@2702 425 #define WK_KLASS_DECLARE(name, symbol, option) \
coleenp@3602 426 static Klass* name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } \
coleenp@3602 427 static Klass** name##_addr() { \
coleenp@3602 428 return &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \
coleenp@3602 429 }
jrose@132 430 WK_KLASSES_DO(WK_KLASS_DECLARE);
jrose@132 431 #undef WK_KLASS_DECLARE
duke@0 432
coleenp@3602 433 static Klass* well_known_klass(WKID id) {
never@2702 434 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob");
never@2702 435 return _well_known_klasses[id];
never@2702 436 }
never@2702 437
coleenp@3602 438 static Klass** well_known_klass_addr(WKID id) {
coleenp@3602 439 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob");
coleenp@3602 440 return &_well_known_klasses[id];
coleenp@3602 441 }
coleenp@3602 442
jrose@132 443 // Local definition for direct access to the private array:
jrose@147 444 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]
duke@0 445
coleenp@3602 446 static Klass* box_klass(BasicType t) {
duke@0 447 assert((uint)t < T_VOID+1, "range check");
duke@0 448 return check_klass(_box_klasses[t]);
duke@0 449 }
coleenp@3602 450 static BasicType box_klass_type(Klass* k); // inverse of box_klass
duke@0 451
duke@0 452 // methods returning lazily loaded klasses
duke@0 453 // The corresponding method to load the class must be called before calling them.
coleenp@3602 454 static Klass* abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); }
duke@0 455
duke@0 456 static void load_abstract_ownable_synchronizer_klass(TRAPS);
duke@0 457
iklam@6573 458 protected:
duke@0 459 // Tells whether ClassLoader.loadClassInternal is present
duke@0 460 static bool has_loadClassInternal() { return _has_loadClassInternal; }
duke@0 461
coleenp@3602 462 // Returns the class loader data to be used when looking up/updating the
coleenp@3602 463 // system dictionary.
coleenp@3602 464 static ClassLoaderData *class_loader_data(Handle class_loader) {
coleenp@3602 465 return ClassLoaderData::class_loader_data(class_loader());
coleenp@3602 466 }
coleenp@3602 467
duke@0 468 public:
duke@0 469 // Tells whether ClassLoader.checkPackageAccess is present
duke@0 470 static bool has_checkPackageAccess() { return _has_checkPackageAccess; }
duke@0 471
coleenp@3963 472 static bool Parameter_klass_loaded() { return WK_KLASS(reflect_Parameter_klass) != NULL; }
never@1142 473 static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; }
never@1142 474 static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; }
coleenp@3602 475 static bool Object_klass_loaded() { return WK_KLASS(Object_klass) != NULL; }
coleenp@3602 476 static bool ClassLoader_klass_loaded() { return WK_KLASS(ClassLoader_klass) != NULL; }
duke@0 477
duke@0 478 // Returns default system loader
duke@0 479 static oop java_system_loader();
duke@0 480
duke@0 481 // Compute the default system loader
duke@0 482 static void compute_java_system_loader(TRAPS);
duke@0 483
coleenp@3602 484 // Register a new class loader
coleenp@3869 485 static ClassLoaderData* register_loader(Handle class_loader, TRAPS);
iklam@6573 486 protected:
duke@0 487 // Mirrors for primitive classes (created eagerly)
duke@0 488 static oop check_mirror(oop m) {
duke@0 489 assert(m != NULL, "mirror not initialized");
duke@0 490 return m;
duke@0 491 }
duke@0 492
duke@0 493 public:
duke@0 494 // Note: java_lang_Class::primitive_type is the inverse of java_mirror
duke@0 495
duke@0 496 // Check class loader constraints
coleenp@2062 497 static bool add_loader_constraint(Symbol* name, Handle loader1,
duke@0 498 Handle loader2, TRAPS);
acorn@4405 499 static Symbol* check_signature_loaders(Symbol* signature, Handle loader1,
acorn@4405 500 Handle loader2, bool is_method, TRAPS);
duke@0 501
jrose@710 502 // JSR 292
twisti@3534 503 // find a java.lang.invoke.MethodHandle.invoke* method for a given signature
twisti@3534 504 // (asks Java to compute it if necessary, except in a compiler thread)
twisti@3534 505 static methodHandle find_method_handle_invoker(Symbol* name,
twisti@3534 506 Symbol* signature,
twisti@3534 507 KlassHandle accessing_klass,
twisti@3534 508 Handle *appendix_result,
twisti@3698 509 Handle *method_type_result,
twisti@3534 510 TRAPS);
twisti@3534 511 // for a given signature, find the internal MethodHandle method (linkTo* or invokeBasic)
twisti@3534 512 // (does not ask Java, since this is a low-level intrinsic defined by the JVM)
twisti@3534 513 static methodHandle find_method_handle_intrinsic(vmIntrinsics::ID iid,
twisti@3534 514 Symbol* signature,
twisti@3534 515 TRAPS);
twisti@3534 516 // find a java.lang.invoke.MethodType object for a given signature
twisti@3534 517 // (asks Java to compute it if necessary, except in a compiler thread)
coleenp@2062 518 static Handle find_method_handle_type(Symbol* signature,
jrose@1428 519 KlassHandle accessing_klass,
jrose@1427 520 TRAPS);
twisti@3534 521
jrose@2204 522 // ask Java to compute a java.lang.invoke.MethodHandle object for a given CP entry
jrose@1522 523 static Handle link_method_handle_constant(KlassHandle caller,
jrose@1522 524 int ref_kind, //e.g., JVM_REF_invokeVirtual
jrose@1522 525 KlassHandle callee,
coleenp@2062 526 Symbol* name,
coleenp@2062 527 Symbol* signature,
jrose@1522 528 TRAPS);
twisti@3534 529
jrose@726 530 // ask Java to create a dynamic call site, while linking an invokedynamic op
twisti@3534 531 static methodHandle find_dynamic_call_site_invoker(KlassHandle caller,
twisti@3534 532 Handle bootstrap_method,
twisti@3534 533 Symbol* name,
twisti@3534 534 Symbol* type,
twisti@3534 535 Handle *appendix_result,
twisti@3698 536 Handle *method_type_result,
twisti@3534 537 TRAPS);
jrose@726 538
duke@0 539 // Utility for printing loader "name" as part of tracing constraints
duke@0 540 static const char* loader_name(oop loader) {
duke@0 541 return ((loader) == NULL ? "<bootloader>" :
coleenp@3602 542 InstanceKlass::cast((loader)->klass())->name()->as_C_string() );
coleenp@3602 543 }
coleenp@3602 544 static const char* loader_name(ClassLoaderData* loader_data) {
coleenp@3869 545 return (loader_data->class_loader() == NULL ? "<bootloader>" :
coleenp@3602 546 InstanceKlass::cast((loader_data->class_loader())->klass())->name()->as_C_string() );
duke@0 547 }
duke@0 548
duke@0 549 // Record the error when the first attempt to resolve a reference from a constant
duke@0 550 // pool entry to a class fails.
coleenp@2062 551 static void add_resolution_error(constantPoolHandle pool, int which, Symbol* error);
coleenp@3602 552 static void delete_resolution_error(ConstantPool* pool);
coleenp@2062 553 static Symbol* find_resolution_error(constantPoolHandle pool, int which);
duke@0 554
iklam@6573 555 protected:
duke@0 556
duke@0 557 enum Constants {
duke@0 558 _loader_constraint_size = 107, // number of entries in constraint table
duke@0 559 _resolution_error_size = 107, // number of entries in resolution error table
jrose@710 560 _invoke_method_size = 139, // number of entries in invoke method table
acorn@3056 561 _nof_buckets = 1009, // number of buckets in hash table for placeholders
acorn@3056 562 _old_default_sdsize = 1009, // backward compat for system dictionary size
acorn@3056 563 _prime_array_size = 8, // array of primes for system dictionary size
acorn@3056 564 _average_depth_goal = 3 // goal for lookup length
duke@0 565 };
duke@0 566
duke@0 567
duke@0 568 // Static variables
duke@0 569
acorn@3056 570 // hashtable sizes for system dictionary to allow growth
acorn@3056 571 // prime numbers for system dictionary size
acorn@3056 572 static int _sdgeneration;
acorn@3056 573 static const int _primelist[_prime_array_size];
acorn@3056 574
duke@0 575 // Hashtable holding loaded classes.
duke@0 576 static Dictionary* _dictionary;
duke@0 577
duke@0 578 // Hashtable holding placeholders for classes being loaded.
duke@0 579 static PlaceholderTable* _placeholders;
duke@0 580
duke@0 581 // Hashtable holding classes from the shared archive.
duke@0 582 static Dictionary* _shared_dictionary;
duke@0 583
duke@0 584 // Monotonically increasing counter which grows with
duke@0 585 // _number_of_classes as well as hot-swapping and breakpoint setting
duke@0 586 // and removal.
duke@0 587 static int _number_of_modifications;
duke@0 588
duke@0 589 // Lock object for system class loader
duke@0 590 static oop _system_loader_lock_obj;
duke@0 591
duke@0 592 // Constraints on class loaders
duke@0 593 static LoaderConstraintTable* _loader_constraints;
duke@0 594
duke@0 595 // Resolution errors
duke@0 596 static ResolutionErrorTable* _resolution_errors;
duke@0 597
jrose@710 598 // Invoke methods (JSR 292)
jrose@710 599 static SymbolPropertyTable* _invoke_method_table;
jrose@710 600
duke@0 601 public:
duke@0 602 // for VM_CounterDecay iteration support
duke@0 603 friend class CounterDecay;
coleenp@3602 604 static Klass* try_get_next_class();
duke@0 605
iklam@6573 606 protected:
duke@0 607 static void validate_protection_domain(instanceKlassHandle klass,
duke@0 608 Handle class_loader,
duke@0 609 Handle protection_domain, TRAPS);
duke@0 610
duke@0 611 friend class VM_PopulateDumpSharedSpace;
duke@0 612 friend class TraversePlaceholdersClosure;
duke@0 613 static Dictionary* dictionary() { return _dictionary; }
duke@0 614 static Dictionary* shared_dictionary() { return _shared_dictionary; }
duke@0 615 static PlaceholderTable* placeholders() { return _placeholders; }
duke@0 616 static LoaderConstraintTable* constraints() { return _loader_constraints; }
duke@0 617 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; }
jrose@710 618 static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; }
duke@0 619
duke@0 620 // Basic loading operations
coleenp@3602 621 static Klass* resolve_instance_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
coleenp@3602 622 static Klass* resolve_array_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
coleenp@2062 623 static instanceKlassHandle handle_parallel_super_load(Symbol* class_name, Symbol* supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS);
duke@0 624 // Wait on SystemDictionary_lock; unlocks lockObject before
duke@0 625 // waiting; relocks lockObject with correct recursion count
duke@0 626 // after waiting, but before reentering SystemDictionary_lock
duke@0 627 // to preserve lock order semantics.
duke@0 628 static void double_lock_wait(Handle lockObject, TRAPS);
duke@0 629 static void define_instance_class(instanceKlassHandle k, TRAPS);
coleenp@2062 630 static instanceKlassHandle find_or_define_instance_class(Symbol* class_name,
duke@0 631 Handle class_loader,
duke@0 632 instanceKlassHandle k, TRAPS);
duke@0 633 static instanceKlassHandle load_shared_class(instanceKlassHandle ik,
iklam@6573 634 Handle class_loader,
iklam@6573 635 Handle protection_domain,
iklam@6573 636 TRAPS);
coleenp@2062 637 static instanceKlassHandle load_instance_class(Symbol* class_name, Handle class_loader, TRAPS);
duke@0 638 static Handle compute_loader_lock_object(Handle class_loader, TRAPS);
duke@0 639 static void check_loader_lock_contention(Handle loader_lock, TRAPS);
acorn@514 640 static bool is_parallelCapable(Handle class_loader);
acorn@1075 641 static bool is_parallelDefine(Handle class_loader);
duke@0 642
twisti@4431 643 public:
iklam@6573 644 static instanceKlassHandle load_shared_class(Symbol* class_name,
iklam@6573 645 Handle class_loader,
iklam@6573 646 TRAPS);
twisti@4431 647 static bool is_ext_class_loader(Handle class_loader);
twisti@4431 648
iklam@6573 649 protected:
coleenp@3602 650 static Klass* find_shared_class(Symbol* class_name);
duke@0 651
duke@0 652 // Setup link to hierarchy
duke@0 653 static void add_to_hierarchy(instanceKlassHandle k, TRAPS);
duke@0 654
sla@4802 655 // event based tracing
mgronlun@5696 656 static void post_class_load_event(const Ticks& start_time, instanceKlassHandle k,
sla@4802 657 Handle initiating_loader);
duke@0 658 // We pass in the hashtable index so we can calculate it outside of
duke@0 659 // the SystemDictionary_lock.
duke@0 660
duke@0 661 // Basic find on loaded classes
coleenp@3602 662 static Klass* find_class(int index, unsigned int hash,
coleenp@3602 663 Symbol* name, ClassLoaderData* loader_data);
coleenp@3602 664 static Klass* find_class(Symbol* class_name, ClassLoaderData* loader_data);
duke@0 665
duke@0 666 // Basic find on classes in the midst of being loaded
coleenp@3602 667 static Symbol* find_placeholder(Symbol* name, ClassLoaderData* loader_data);
duke@0 668
duke@0 669 // Updating entry in dictionary
duke@0 670 // Add a completely loaded class
coleenp@2062 671 static void add_klass(int index, Symbol* class_name,
coleenp@3602 672 ClassLoaderData* loader_data, KlassHandle obj);
duke@0 673
duke@0 674 // Add a placeholder for a class being loaded
duke@0 675 static void add_placeholder(int index,
coleenp@2062 676 Symbol* class_name,
coleenp@3602 677 ClassLoaderData* loader_data);
duke@0 678 static void remove_placeholder(int index,
coleenp@2062 679 Symbol* class_name,
coleenp@3602 680 ClassLoaderData* loader_data);
duke@0 681
duke@0 682 // Performs cleanups after resolve_super_or_fail. This typically needs
duke@0 683 // to be called on failure.
duke@0 684 // Won't throw, but can block.
coleenp@2062 685 static void resolution_cleanups(Symbol* class_name,
coleenp@3602 686 ClassLoaderData* loader_data,
duke@0 687 TRAPS);
duke@0 688
duke@0 689 // Initialization
duke@0 690 static void initialize_preloaded_classes(TRAPS);
duke@0 691
duke@0 692 // Class loader constraints
duke@0 693 static void check_constraints(int index, unsigned int hash,
duke@0 694 instanceKlassHandle k, Handle loader,
duke@0 695 bool defining, TRAPS);
duke@0 696 static void update_dictionary(int d_index, unsigned int d_hash,
duke@0 697 int p_index, unsigned int p_hash,
coleenp@3602 698 instanceKlassHandle k, Handle loader,
coleenp@3602 699 TRAPS);
duke@0 700
duke@0 701 // Variables holding commonly used klasses (preloaded)
coleenp@3602 702 static Klass* _well_known_klasses[];
duke@0 703
duke@0 704 // Lazily loaded klasses
coleenp@3602 705 static Klass* volatile _abstract_ownable_synchronizer_klass;
duke@0 706
jrose@132 707 // table of box klasses (int_klass, etc.)
coleenp@3602 708 static Klass* _box_klasses[T_VOID+1];
duke@0 709
duke@0 710 static oop _java_system_loader;
duke@0 711
duke@0 712 static bool _has_loadClassInternal;
duke@0 713 static bool _has_checkPackageAccess;
duke@0 714 };
jrose@665 715
stefank@1879 716 #endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP