annotate src/share/vm/classfile/systemDictionary.hpp @ 3723:65d07d9ee446

8000263: JSR 292: signature types may appear to be unloaded Reviewed-by: kvn, jrose
author twisti
date Mon, 08 Oct 2012 17:04:00 -0700
parents f6b0eb4e44cf
children 19eb999cb72c
rev   line source
duke@0 1 /*
acorn@3056 2 * Copyright (c) 1997, 2012, 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
duke@0 37 // The system dictionary stores all loaded classes and maps:
duke@0 38 //
coleenp@3602 39 // [class name,class loader] -> class i.e. [Symbol*,oop] -> Klass*
duke@0 40 //
duke@0 41 // Classes are loaded lazily. The default VM class loader is
duke@0 42 // represented as NULL.
duke@0 43
duke@0 44 // The underlying data structure is an open hash table with a fixed number
duke@0 45 // of buckets. During loading the loader object is locked, (for the VM loader
duke@0 46 // a private lock object is used). Class loading can thus be done concurrently,
duke@0 47 // but only by different loaders.
duke@0 48 //
duke@0 49 // During loading a placeholder (name, loader) is temporarily placed in
duke@0 50 // a side data structure, and is used to detect ClassCircularityErrors
duke@0 51 // and to perform verification during GC. A GC can occur in the midst
duke@0 52 // of class loading, as we call out to Java, have to take locks, etc.
duke@0 53 //
duke@0 54 // When class loading is finished, a new entry is added to the system
duke@0 55 // dictionary and the place holder is removed. Note that the protection
duke@0 56 // domain field of the system dictionary has not yet been filled in when
duke@0 57 // the "real" system dictionary entry is created.
duke@0 58 //
duke@0 59 // Clients of this class who are interested in finding if a class has
duke@0 60 // been completely loaded -- not classes in the process of being loaded --
duke@0 61 // can read the SystemDictionary unlocked. This is safe because
duke@0 62 // - entries are only deleted at safepoints
duke@0 63 // - readers cannot come to a safepoint while actively examining
duke@0 64 // an entry (an entry cannot be deleted from under a reader)
duke@0 65 // - entries must be fully formed before they are available to concurrent
duke@0 66 // readers (we must ensure write ordering)
duke@0 67 //
duke@0 68 // Note that placeholders are deleted at any time, as they are removed
duke@0 69 // when a class is completely loaded. Therefore, readers as well as writers
duke@0 70 // of placeholders must hold the SystemDictionary_lock.
duke@0 71 //
duke@0 72
duke@0 73 class Dictionary;
duke@0 74 class PlaceholderTable;
duke@0 75 class LoaderConstraintTable;
zgu@3465 76 template <MEMFLAGS F> class HashtableBucket;
duke@0 77 class ResolutionErrorTable;
jrose@710 78 class SymbolPropertyTable;
duke@0 79
jrose@132 80 // Certain classes are preloaded, such as java.lang.Object and java.lang.String.
jrose@132 81 // They are all "well-known", in the sense that no class loader is allowed
jrose@132 82 // to provide a different definition.
jrose@132 83 //
jrose@132 84 // These klasses must all have names defined in vmSymbols.
jrose@132 85
jrose@132 86 #define WK_KLASS_ENUM_NAME(kname) kname##_knum
jrose@132 87
jrose@132 88 // Each well-known class has a short klass name (like object_klass),
jrose@132 89 // a vmSymbol name (like java_lang_Object), and a flag word
jrose@132 90 // that makes some minor distinctions, like whether the klass
jrose@132 91 // is preloaded, optional, release-specific, etc.
jrose@132 92 // The order of these definitions is significant; it is the order in which
jrose@132 93 // preloading is actually performed by initialize_preloaded_classes.
jrose@132 94
twisti@3723 95 #define WK_KLASSES_DO(do_klass) \
twisti@3723 96 /* well-known classes */ \
twisti@3723 97 do_klass(Object_klass, java_lang_Object, Pre_Link ) \
twisti@3723 98 do_klass(String_klass, java_lang_String, Pre_Link ) \
twisti@3723 99 do_klass(Class_klass, java_lang_Class, Pre_Link ) \
twisti@3723 100 do_klass(Cloneable_klass, java_lang_Cloneable, Pre_Link ) \
twisti@3723 101 do_klass(ClassLoader_klass, java_lang_ClassLoader, Pre_Link ) \
twisti@3723 102 do_klass(Serializable_klass, java_io_Serializable, Pre_Link ) \
twisti@3723 103 do_klass(System_klass, java_lang_System, Pre_Link ) \
twisti@3723 104 do_klass(Throwable_klass, java_lang_Throwable, Pre_Link ) \
twisti@3723 105 do_klass(Error_klass, java_lang_Error, Pre_Link ) \
twisti@3723 106 do_klass(ThreadDeath_klass, java_lang_ThreadDeath, Pre_Link ) \
twisti@3723 107 do_klass(Exception_klass, java_lang_Exception, Pre_Link ) \
twisti@3723 108 do_klass(RuntimeException_klass, java_lang_RuntimeException, Pre_Link ) \
twisti@3723 109 do_klass(ProtectionDomain_klass, java_security_ProtectionDomain, Pre_Link ) \
twisti@3723 110 do_klass(AccessControlContext_klass, java_security_AccessControlContext, Pre_Link ) \
twisti@3723 111 do_klass(ClassNotFoundException_klass, java_lang_ClassNotFoundException, Pre_Link ) \
twisti@3723 112 do_klass(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre_Link ) \
twisti@3723 113 do_klass(LinkageError_klass, java_lang_LinkageError, Pre_Link ) \
twisti@3723 114 do_klass(ClassCastException_klass, java_lang_ClassCastException, Pre_Link ) \
twisti@3723 115 do_klass(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre_Link ) \
twisti@3723 116 do_klass(VirtualMachineError_klass, java_lang_VirtualMachineError, Pre_Link ) \
twisti@3723 117 do_klass(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre_Link ) \
twisti@3723 118 do_klass(StackOverflowError_klass, java_lang_StackOverflowError, Pre_Link ) \
twisti@3723 119 do_klass(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre_Link ) \
twisti@3723 120 do_klass(Reference_klass, java_lang_ref_Reference, Pre_Link ) \
twisti@3723 121 \
twisti@3723 122 /* Preload ref klasses and set reference types */ \
twisti@3723 123 do_klass(SoftReference_klass, java_lang_ref_SoftReference, Pre_Link ) \
twisti@3723 124 do_klass(WeakReference_klass, java_lang_ref_WeakReference, Pre_Link ) \
twisti@3723 125 do_klass(FinalReference_klass, java_lang_ref_FinalReference, Pre ) \
twisti@3723 126 do_klass(PhantomReference_klass, java_lang_ref_PhantomReference, Pre_Link ) \
twisti@3723 127 do_klass(Finalizer_klass, java_lang_ref_Finalizer, Pre ) \
twisti@3723 128 \
twisti@3723 129 do_klass(Thread_klass, java_lang_Thread, Pre_Link ) \
twisti@3723 130 do_klass(ThreadGroup_klass, java_lang_ThreadGroup, Pre_Link ) \
twisti@3723 131 do_klass(Properties_klass, java_util_Properties, Pre_Link ) \
twisti@3723 132 do_klass(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject, Pre_Link ) \
twisti@3723 133 do_klass(reflect_Field_klass, java_lang_reflect_Field, Pre_Link ) \
twisti@3723 134 do_klass(reflect_Method_klass, java_lang_reflect_Method, Pre_Link ) \
twisti@3723 135 do_klass(reflect_Constructor_klass, java_lang_reflect_Constructor, Pre_Link ) \
twisti@3723 136 \
never@2702 137 /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \
never@2702 138 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
never@2702 139 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
twisti@3723 140 do_klass(reflect_MagicAccessorImpl_klass, sun_reflect_MagicAccessorImpl, Opt ) \
twisti@3723 141 do_klass(reflect_MethodAccessorImpl_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \
twisti@3723 142 do_klass(reflect_ConstructorAccessorImpl_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \
twisti@3723 143 do_klass(reflect_DelegatingClassLoader_klass, sun_reflect_DelegatingClassLoader, Opt ) \
twisti@3723 144 do_klass(reflect_ConstantPool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15 ) \
twisti@3723 145 do_klass(reflect_UnsafeStaticFieldAccessorImpl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15 ) \
twisti@3723 146 \
twisti@3723 147 /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \
twisti@3723 148 do_klass(MethodHandle_klass, java_lang_invoke_MethodHandle, Pre_Link ) \
twisti@3723 149 do_klass(MemberName_klass, java_lang_invoke_MemberName, Pre ) \
twisti@3723 150 do_klass(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives, Pre ) \
twisti@3723 151 do_klass(LambdaForm_klass, java_lang_invoke_LambdaForm, Opt ) \
twisti@3723 152 do_klass(MethodType_klass, java_lang_invoke_MethodType, Pre_Link ) \
twisti@3723 153 do_klass(BootstrapMethodError_klass, java_lang_BootstrapMethodError, Pre_Link ) \
twisti@3723 154 do_klass(CallSite_klass, java_lang_invoke_CallSite, Pre_Link ) \
twisti@3723 155 do_klass(ConstantCallSite_klass, java_lang_invoke_ConstantCallSite, Pre_Link ) \
twisti@3723 156 do_klass(MutableCallSite_klass, java_lang_invoke_MutableCallSite, Pre_Link ) \
twisti@3723 157 do_klass(VolatileCallSite_klass, java_lang_invoke_VolatileCallSite, Pre_Link ) \
twisti@3723 158 /* Note: MethodHandle must be first, and VolatileCallSite last in group */ \
twisti@3723 159 \
twisti@3723 160 do_klass(StringBuffer_klass, java_lang_StringBuffer, Pre_Link ) \
twisti@3723 161 do_klass(StringBuilder_klass, java_lang_StringBuilder, Pre_Link ) \
twisti@3723 162 \
twisti@3723 163 /* It's NULL in non-1.4 JDKs. */ \
twisti@3723 164 do_klass(StackTraceElement_klass, java_lang_StackTraceElement, Opt ) \
twisti@3723 165 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
twisti@3723 166 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
twisti@3723 167 do_klass(nio_Buffer_klass, java_nio_Buffer, Opt ) \
twisti@3723 168 \
twisti@3723 169 do_klass(DownloadManager_klass, sun_jkernel_DownloadManager, Opt_Kernel ) \
twisti@3723 170 \
twisti@3723 171 do_klass(PostVMInitHook_klass, sun_misc_PostVMInitHook, Opt ) \
twisti@3723 172 \
twisti@3723 173 /* Preload boxing klasses */ \
twisti@3723 174 do_klass(Boolean_klass, java_lang_Boolean, Pre_Link ) \
twisti@3723 175 do_klass(Character_klass, java_lang_Character, Pre_Link ) \
twisti@3723 176 do_klass(Float_klass, java_lang_Float, Pre_Link ) \
twisti@3723 177 do_klass(Double_klass, java_lang_Double, Pre_Link ) \
twisti@3723 178 do_klass(Byte_klass, java_lang_Byte, Pre_Link ) \
twisti@3723 179 do_klass(Short_klass, java_lang_Short, Pre_Link ) \
twisti@3723 180 do_klass(Integer_klass, java_lang_Integer, Pre_Link ) \
twisti@3723 181 do_klass(Long_klass, java_lang_Long, Pre_Link ) \
jrose@132 182 /*end*/
jrose@132 183
jrose@132 184
duke@0 185 class SystemDictionary : AllStatic {
duke@0 186 friend class VMStructs;
jrose@665 187 friend class SystemDictionaryHandles;
duke@0 188
duke@0 189 public:
jrose@132 190 enum WKID {
jrose@132 191 NO_WKID = 0,
jrose@132 192
never@2702 193 #define WK_KLASS_ENUM(name, symbol, ignore_o) WK_KLASS_ENUM_NAME(name), WK_KLASS_ENUM_NAME(symbol) = WK_KLASS_ENUM_NAME(name),
jrose@132 194 WK_KLASSES_DO(WK_KLASS_ENUM)
jrose@132 195 #undef WK_KLASS_ENUM
jrose@132 196
jrose@132 197 WKID_LIMIT,
jrose@132 198
jrose@132 199 FIRST_WKID = NO_WKID + 1
jrose@132 200 };
jrose@132 201
jrose@132 202 enum InitOption {
jrose@132 203 Pre, // preloaded; error if not present
twisti@3723 204 Pre_Link, // preloaded; error if not present; link as well-known
jrose@132 205
jrose@132 206 // Order is significant. Options before this point require resolve_or_fail.
jrose@132 207 // Options after this point will use resolve_or_null instead.
jrose@132 208
jrose@132 209 Opt, // preload tried; NULL if not present
jrose@132 210 Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection
jrose@132 211 Opt_Only_JDK15, // preload tried; use only with JDK1.5+
jrose@132 212 Opt_Kernel, // preload tried only #ifdef KERNEL
jrose@132 213 OPTION_LIMIT,
jrose@132 214 CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT)
jrose@132 215 };
jrose@132 216
jrose@132 217
duke@0 218 // Returns a class with a given class name and class loader. Loads the
duke@0 219 // class if needed. If not found a NoClassDefFoundError or a
duke@0 220 // ClassNotFoundException is thrown, depending on the value on the
duke@0 221 // throw_error flag. For most uses the throw_error argument should be set
duke@0 222 // to true.
duke@0 223
coleenp@3602 224 static Klass* resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS);
duke@0 225 // Convenient call for null loader and protection domain.
coleenp@3602 226 static Klass* resolve_or_fail(Symbol* class_name, bool throw_error, TRAPS);
duke@0 227 private:
duke@0 228 // handle error translation for resolve_or_null results
coleenp@3602 229 static Klass* handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS);
duke@0 230
duke@0 231 public:
duke@0 232
duke@0 233 // Returns a class with a given class name and class loader.
duke@0 234 // Loads the class if needed. If not found NULL is returned.
coleenp@3602 235 static Klass* resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
duke@0 236 // Version with null loader and protection domain
coleenp@3602 237 static Klass* resolve_or_null(Symbol* class_name, TRAPS);
duke@0 238
duke@0 239 // Resolve a superclass or superinterface. Called from ClassFileParser,
duke@0 240 // parse_interfaces, resolve_instance_class_or_null, load_shared_class
duke@0 241 // "child_name" is the class whose super class or interface is being resolved.
coleenp@3602 242 static Klass* resolve_super_or_fail(Symbol* child_name,
coleenp@2062 243 Symbol* class_name,
duke@0 244 Handle class_loader,
duke@0 245 Handle protection_domain,
duke@0 246 bool is_superclass,
duke@0 247 TRAPS);
duke@0 248
duke@0 249 // Parse new stream. This won't update the system dictionary or
duke@0 250 // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses.
coleenp@3602 251 static Klass* parse_stream(Symbol* class_name,
duke@0 252 Handle class_loader,
duke@0 253 Handle protection_domain,
duke@0 254 ClassFileStream* st,
jrose@431 255 TRAPS) {
jrose@431 256 KlassHandle nullHandle;
jrose@431 257 return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD);
jrose@431 258 }
coleenp@3602 259 static Klass* parse_stream(Symbol* class_name,
jrose@431 260 Handle class_loader,
jrose@431 261 Handle protection_domain,
jrose@431 262 ClassFileStream* st,
jrose@431 263 KlassHandle host_klass,
jrose@431 264 GrowableArray<Handle>* cp_patches,
duke@0 265 TRAPS);
duke@0 266
duke@0 267 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass)
coleenp@3602 268 static Klass* resolve_from_stream(Symbol* class_name, Handle class_loader,
acorn@973 269 Handle protection_domain,
acorn@973 270 ClassFileStream* st, bool verify, TRAPS);
duke@0 271
duke@0 272 // Lookup an already loaded class. If not found NULL is returned.
coleenp@3602 273 static Klass* find(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
duke@0 274
duke@0 275 // Lookup an already loaded instance or array class.
duke@0 276 // Do not make any queries to class loaders; consult only the cache.
duke@0 277 // If not found NULL is returned.
coleenp@3602 278 static Klass* find_instance_or_array_klass(Symbol* class_name,
duke@0 279 Handle class_loader,
duke@0 280 Handle protection_domain,
duke@0 281 TRAPS);
duke@0 282
jrose@132 283 // If the given name is known to vmSymbols, return the well-know klass:
coleenp@3602 284 static Klass* find_well_known_klass(Symbol* class_name);
jrose@132 285
duke@0 286 // Lookup an instance or array class that has already been loaded
duke@0 287 // either into the given class loader, or else into another class
duke@0 288 // loader that is constrained (via loader constraints) to produce
duke@0 289 // a consistent class. Do not take protection domains into account.
duke@0 290 // Do not make any queries to class loaders; consult only the cache.
duke@0 291 // Return NULL if the class is not found.
duke@0 292 //
duke@0 293 // This function is a strict superset of find_instance_or_array_klass.
duke@0 294 // This function (the unchecked version) makes a conservative prediction
duke@0 295 // of the result of the checked version, assuming successful lookup.
duke@0 296 // If both functions return non-null, they must return the same value.
duke@0 297 // Also, the unchecked version may sometimes be non-null where the
duke@0 298 // checked version is null. This can occur in several ways:
duke@0 299 // 1. No query has yet been made to the class loader.
duke@0 300 // 2. The class loader was queried, but chose not to delegate.
duke@0 301 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain.
duke@0 302 // 4. Loading was attempted, but there was a linkage error of some sort.
duke@0 303 // In all of these cases, the loader constraints on this type are
duke@0 304 // satisfied, and it is safe for classes in the given class loader
duke@0 305 // to manipulate strongly-typed values of the found class, subject
duke@0 306 // to local linkage and access checks.
coleenp@3602 307 static Klass* find_constrained_instance_or_array_klass(Symbol* class_name,
duke@0 308 Handle class_loader,
duke@0 309 TRAPS);
duke@0 310
duke@0 311 // Iterate over all klasses in dictionary
duke@0 312 // Just the classes from defining class loaders
coleenp@3602 313 static void classes_do(void f(Klass*));
duke@0 314 // Added for initialize_itable_for_klass to handle exceptions
coleenp@3602 315 static void classes_do(void f(Klass*, TRAPS), TRAPS);
duke@0 316 // All classes, and their class loaders
coleenp@3602 317 static void classes_do(void f(Klass*, ClassLoaderData*));
duke@0 318 // All classes, and their class loaders
duke@0 319 // (added for helpers that use HandleMarks and ResourceMarks)
coleenp@3602 320 static void classes_do(void f(Klass*, ClassLoaderData*, TRAPS), TRAPS);
duke@0 321 // All entries in the placeholder table and their class loaders
coleenp@3602 322 static void placeholders_do(void f(Symbol*));
duke@0 323
duke@0 324 // Iterate over all methods in all klasses in dictionary
coleenp@3602 325 static void methods_do(void f(Method*));
duke@0 326
duke@0 327 // Garbage collection support
duke@0 328
duke@0 329 // This method applies "blk->do_oop" to all the pointers to "system"
duke@0 330 // classes and loaders.
duke@0 331 static void always_strong_oops_do(OopClosure* blk);
coleenp@3602 332 static void always_strong_classes_do(KlassClosure* closure);
duke@0 333
duke@0 334 // Unload (that is, break root links to) all unmarked classes and
duke@0 335 // loaders. Returns "true" iff something was unloaded.
duke@0 336 static bool do_unloading(BoolObjectClosure* is_alive);
duke@0 337
acorn@3056 338 static int calculate_systemdictionary_size(int loadedclasses);
acorn@3056 339
duke@0 340 // Applies "f->do_oop" to all root oops in the system dictionary.
duke@0 341 static void oops_do(OopClosure* f);
duke@0 342
duke@0 343 // System loader lock
duke@0 344 static oop system_loader_lock() { return _system_loader_lock_obj; }
duke@0 345
duke@0 346 private:
coleenp@3602 347 // Extended Redefine classes support (tbi)
coleenp@3602 348 static void preloaded_classes_do(KlassClosure* f);
coleenp@3602 349 static void lazily_loaded_classes_do(KlassClosure* f);
duke@0 350 public:
duke@0 351 // Sharing support.
duke@0 352 static void reorder_dictionary();
duke@0 353 static void copy_buckets(char** top, char* end);
duke@0 354 static void copy_table(char** top, char* end);
duke@0 355 static void reverse();
zgu@3465 356 static void set_shared_dictionary(HashtableBucket<mtClass>* t, int length,
duke@0 357 int number_of_entries);
duke@0 358 // Printing
duke@0 359 static void print() PRODUCT_RETURN;
duke@0 360 static void print_class_statistics() PRODUCT_RETURN;
duke@0 361 static void print_method_statistics() PRODUCT_RETURN;
duke@0 362
duke@0 363 // Number of contained klasses
duke@0 364 // This is both fully loaded classes and classes in the process
duke@0 365 // of being loaded
duke@0 366 static int number_of_classes();
duke@0 367
duke@0 368 // Monotonically increasing counter which grows as classes are
duke@0 369 // loaded or modifications such as hot-swapping or setting/removing
duke@0 370 // of breakpoints are performed
duke@0 371 static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; }
duke@0 372 // Needed by evolution and breakpoint code
duke@0 373 static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; }
duke@0 374
duke@0 375 // Verification
duke@0 376 static void verify();
duke@0 377
duke@0 378 #ifdef ASSERT
coleenp@2062 379 static bool is_internal_format(Symbol* class_name);
duke@0 380 #endif
duke@0 381
duke@0 382 // Verify class is in dictionary
coleenp@3602 383 static void verify_obj_klass_present(Symbol* class_name,
coleenp@3602 384 ClassLoaderData* loader_data);
duke@0 385
duke@0 386 // Initialization
duke@0 387 static void initialize(TRAPS);
duke@0 388
duke@0 389 // Fast access to commonly used classes (preloaded)
coleenp@3602 390 static Klass* check_klass(Klass* k) {
duke@0 391 assert(k != NULL, "preloaded klass not initialized");
duke@0 392 return k;
duke@0 393 }
duke@0 394
twisti@3723 395 static Klass* check_klass_Pre( Klass* k) { return check_klass(k); }
twisti@3723 396 static Klass* check_klass_Pre_Link( Klass* k) { return check_klass(k); }
twisti@3723 397 static Klass* check_klass_Opt( Klass* k) { return k; }
coleenp@3602 398 static Klass* check_klass_Opt_Kernel(Klass* k) { return k; } //== Opt
coleenp@3602 399 static Klass* check_klass_Opt_Only_JDK15(Klass* k) {
jrose@132 400 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only");
jrose@132 401 return k;
jrose@132 402 }
coleenp@3602 403 static Klass* check_klass_Opt_Only_JDK14NewRef(Klass* k) {
duke@0 404 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only");
jrose@132 405 // despite the optional loading, if you use this it must be present:
jrose@132 406 return check_klass(k);
duke@0 407 }
duke@0 408
jrose@132 409 static bool initialize_wk_klass(WKID id, int init_opt, TRAPS);
jrose@132 410 static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS);
jrose@132 411 static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) {
jrose@132 412 int limit = (int)end_id + 1;
jrose@132 413 initialize_wk_klasses_until((WKID) limit, start_id, THREAD);
jrose@132 414 }
duke@0 415
twisti@3723 416 static void check_wk_pre_link_klasses() NOT_DEBUG_RETURN;
twisti@3723 417
jrose@132 418 public:
never@2702 419 #define WK_KLASS_DECLARE(name, symbol, option) \
coleenp@3602 420 static Klass* name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } \
coleenp@3602 421 static Klass** name##_addr() { \
coleenp@3602 422 return &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \
coleenp@3602 423 }
jrose@132 424 WK_KLASSES_DO(WK_KLASS_DECLARE);
jrose@132 425 #undef WK_KLASS_DECLARE
duke@0 426
coleenp@3602 427 static Klass* well_known_klass(WKID id) {
never@2702 428 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob");
never@2702 429 return _well_known_klasses[id];
never@2702 430 }
never@2702 431
coleenp@3602 432 static Klass** well_known_klass_addr(WKID id) {
coleenp@3602 433 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob");
coleenp@3602 434 return &_well_known_klasses[id];
coleenp@3602 435 }
coleenp@3602 436
jrose@132 437 // Local definition for direct access to the private array:
jrose@147 438 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]
duke@0 439
coleenp@3602 440 static Klass* box_klass(BasicType t) {
duke@0 441 assert((uint)t < T_VOID+1, "range check");
duke@0 442 return check_klass(_box_klasses[t]);
duke@0 443 }
coleenp@3602 444 static BasicType box_klass_type(Klass* k); // inverse of box_klass
duke@0 445
duke@0 446 // methods returning lazily loaded klasses
duke@0 447 // The corresponding method to load the class must be called before calling them.
coleenp@3602 448 static Klass* abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); }
duke@0 449
duke@0 450 static void load_abstract_ownable_synchronizer_klass(TRAPS);
duke@0 451
duke@0 452 private:
duke@0 453 // Tells whether ClassLoader.loadClassInternal is present
duke@0 454 static bool has_loadClassInternal() { return _has_loadClassInternal; }
duke@0 455
coleenp@3602 456 // Returns the class loader data to be used when looking up/updating the
coleenp@3602 457 // system dictionary.
coleenp@3602 458 static ClassLoaderData *class_loader_data(Handle class_loader) {
coleenp@3602 459 return ClassLoaderData::class_loader_data(class_loader());
coleenp@3602 460 }
coleenp@3602 461
duke@0 462 public:
duke@0 463 // Tells whether ClassLoader.checkPackageAccess is present
duke@0 464 static bool has_checkPackageAccess() { return _has_checkPackageAccess; }
duke@0 465
never@1142 466 static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; }
never@1142 467 static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; }
coleenp@3602 468 static bool Object_klass_loaded() { return WK_KLASS(Object_klass) != NULL; }
coleenp@3602 469 static bool ClassLoader_klass_loaded() { return WK_KLASS(ClassLoader_klass) != NULL; }
duke@0 470
duke@0 471 // Returns default system loader
duke@0 472 static oop java_system_loader();
duke@0 473
duke@0 474 // Compute the default system loader
duke@0 475 static void compute_java_system_loader(TRAPS);
duke@0 476
coleenp@3602 477 // Register a new class loader
coleenp@3602 478 static ClassLoaderData* register_loader(Handle class_loader);
duke@0 479 private:
duke@0 480 // Mirrors for primitive classes (created eagerly)
duke@0 481 static oop check_mirror(oop m) {
duke@0 482 assert(m != NULL, "mirror not initialized");
duke@0 483 return m;
duke@0 484 }
duke@0 485
duke@0 486 public:
duke@0 487 // Note: java_lang_Class::primitive_type is the inverse of java_mirror
duke@0 488
duke@0 489 // Check class loader constraints
coleenp@2062 490 static bool add_loader_constraint(Symbol* name, Handle loader1,
duke@0 491 Handle loader2, TRAPS);
coleenp@2062 492 static char* check_signature_loaders(Symbol* signature, Handle loader1,
duke@0 493 Handle loader2, bool is_method, TRAPS);
duke@0 494
jrose@710 495 // JSR 292
twisti@3534 496 // find a java.lang.invoke.MethodHandle.invoke* method for a given signature
twisti@3534 497 // (asks Java to compute it if necessary, except in a compiler thread)
twisti@3534 498 static methodHandle find_method_handle_invoker(Symbol* name,
twisti@3534 499 Symbol* signature,
twisti@3534 500 KlassHandle accessing_klass,
twisti@3534 501 Handle *appendix_result,
twisti@3698 502 Handle *method_type_result,
twisti@3534 503 TRAPS);
twisti@3534 504 // for a given signature, find the internal MethodHandle method (linkTo* or invokeBasic)
twisti@3534 505 // (does not ask Java, since this is a low-level intrinsic defined by the JVM)
twisti@3534 506 static methodHandle find_method_handle_intrinsic(vmIntrinsics::ID iid,
twisti@3534 507 Symbol* signature,
twisti@3534 508 TRAPS);
twisti@3534 509 // find a java.lang.invoke.MethodType object for a given signature
twisti@3534 510 // (asks Java to compute it if necessary, except in a compiler thread)
coleenp@2062 511 static Handle find_method_handle_type(Symbol* signature,
jrose@1428 512 KlassHandle accessing_klass,
jrose@1427 513 TRAPS);
twisti@3534 514
jrose@2204 515 // ask Java to compute a java.lang.invoke.MethodHandle object for a given CP entry
jrose@1522 516 static Handle link_method_handle_constant(KlassHandle caller,
jrose@1522 517 int ref_kind, //e.g., JVM_REF_invokeVirtual
jrose@1522 518 KlassHandle callee,
coleenp@2062 519 Symbol* name,
coleenp@2062 520 Symbol* signature,
jrose@1522 521 TRAPS);
twisti@3534 522
jrose@726 523 // ask Java to create a dynamic call site, while linking an invokedynamic op
twisti@3534 524 static methodHandle find_dynamic_call_site_invoker(KlassHandle caller,
twisti@3534 525 Handle bootstrap_method,
twisti@3534 526 Symbol* name,
twisti@3534 527 Symbol* type,
twisti@3534 528 Handle *appendix_result,
twisti@3698 529 Handle *method_type_result,
twisti@3534 530 TRAPS);
jrose@726 531
duke@0 532 // Utility for printing loader "name" as part of tracing constraints
duke@0 533 static const char* loader_name(oop loader) {
duke@0 534 return ((loader) == NULL ? "<bootloader>" :
coleenp@3602 535 InstanceKlass::cast((loader)->klass())->name()->as_C_string() );
coleenp@3602 536 }
coleenp@3602 537 static const char* loader_name(ClassLoaderData* loader_data) {
coleenp@3602 538 return (loader_data->is_the_null_class_loader_data() ? "<bootloader>" :
coleenp@3602 539 InstanceKlass::cast((loader_data->class_loader())->klass())->name()->as_C_string() );
duke@0 540 }
duke@0 541
duke@0 542 // Record the error when the first attempt to resolve a reference from a constant
duke@0 543 // pool entry to a class fails.
coleenp@2062 544 static void add_resolution_error(constantPoolHandle pool, int which, Symbol* error);
coleenp@3602 545 static void delete_resolution_error(ConstantPool* pool);
coleenp@2062 546 static Symbol* find_resolution_error(constantPoolHandle pool, int which);
duke@0 547
duke@0 548 private:
duke@0 549
duke@0 550 enum Constants {
duke@0 551 _loader_constraint_size = 107, // number of entries in constraint table
duke@0 552 _resolution_error_size = 107, // number of entries in resolution error table
jrose@710 553 _invoke_method_size = 139, // number of entries in invoke method table
acorn@3056 554 _nof_buckets = 1009, // number of buckets in hash table for placeholders
acorn@3056 555 _old_default_sdsize = 1009, // backward compat for system dictionary size
acorn@3056 556 _prime_array_size = 8, // array of primes for system dictionary size
acorn@3056 557 _average_depth_goal = 3 // goal for lookup length
duke@0 558 };
duke@0 559
duke@0 560
duke@0 561 // Static variables
duke@0 562
acorn@3056 563 // hashtable sizes for system dictionary to allow growth
acorn@3056 564 // prime numbers for system dictionary size
acorn@3056 565 static int _sdgeneration;
acorn@3056 566 static const int _primelist[_prime_array_size];
acorn@3056 567
duke@0 568 // Hashtable holding loaded classes.
duke@0 569 static Dictionary* _dictionary;
duke@0 570
duke@0 571 // Hashtable holding placeholders for classes being loaded.
duke@0 572 static PlaceholderTable* _placeholders;
duke@0 573
duke@0 574 // Hashtable holding classes from the shared archive.
duke@0 575 static Dictionary* _shared_dictionary;
duke@0 576
duke@0 577 // Monotonically increasing counter which grows with
duke@0 578 // _number_of_classes as well as hot-swapping and breakpoint setting
duke@0 579 // and removal.
duke@0 580 static int _number_of_modifications;
duke@0 581
duke@0 582 // Lock object for system class loader
duke@0 583 static oop _system_loader_lock_obj;
duke@0 584
duke@0 585 // Constraints on class loaders
duke@0 586 static LoaderConstraintTable* _loader_constraints;
duke@0 587
duke@0 588 // Resolution errors
duke@0 589 static ResolutionErrorTable* _resolution_errors;
duke@0 590
jrose@710 591 // Invoke methods (JSR 292)
jrose@710 592 static SymbolPropertyTable* _invoke_method_table;
jrose@710 593
duke@0 594 public:
duke@0 595 // for VM_CounterDecay iteration support
duke@0 596 friend class CounterDecay;
coleenp@3602 597 static Klass* try_get_next_class();
duke@0 598
duke@0 599 private:
duke@0 600 static void validate_protection_domain(instanceKlassHandle klass,
duke@0 601 Handle class_loader,
duke@0 602 Handle protection_domain, TRAPS);
duke@0 603
duke@0 604 friend class VM_PopulateDumpSharedSpace;
duke@0 605 friend class TraversePlaceholdersClosure;
duke@0 606 static Dictionary* dictionary() { return _dictionary; }
duke@0 607 static Dictionary* shared_dictionary() { return _shared_dictionary; }
duke@0 608 static PlaceholderTable* placeholders() { return _placeholders; }
duke@0 609 static LoaderConstraintTable* constraints() { return _loader_constraints; }
duke@0 610 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; }
jrose@710 611 static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; }
duke@0 612
duke@0 613 // Basic loading operations
coleenp@3602 614 static Klass* resolve_instance_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
coleenp@3602 615 static Klass* resolve_array_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
coleenp@2062 616 static instanceKlassHandle handle_parallel_super_load(Symbol* class_name, Symbol* supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS);
duke@0 617 // Wait on SystemDictionary_lock; unlocks lockObject before
duke@0 618 // waiting; relocks lockObject with correct recursion count
duke@0 619 // after waiting, but before reentering SystemDictionary_lock
duke@0 620 // to preserve lock order semantics.
duke@0 621 static void double_lock_wait(Handle lockObject, TRAPS);
duke@0 622 static void define_instance_class(instanceKlassHandle k, TRAPS);
coleenp@2062 623 static instanceKlassHandle find_or_define_instance_class(Symbol* class_name,
duke@0 624 Handle class_loader,
duke@0 625 instanceKlassHandle k, TRAPS);
coleenp@2062 626 static instanceKlassHandle load_shared_class(Symbol* class_name,
duke@0 627 Handle class_loader, TRAPS);
duke@0 628 static instanceKlassHandle load_shared_class(instanceKlassHandle ik,
duke@0 629 Handle class_loader, TRAPS);
coleenp@2062 630 static instanceKlassHandle load_instance_class(Symbol* class_name, Handle class_loader, TRAPS);
duke@0 631 static Handle compute_loader_lock_object(Handle class_loader, TRAPS);
duke@0 632 static void check_loader_lock_contention(Handle loader_lock, TRAPS);
acorn@514 633 static bool is_parallelCapable(Handle class_loader);
acorn@1075 634 static bool is_parallelDefine(Handle class_loader);
duke@0 635
coleenp@3602 636 static Klass* find_shared_class(Symbol* class_name);
duke@0 637
duke@0 638 // Setup link to hierarchy
duke@0 639 static void add_to_hierarchy(instanceKlassHandle k, TRAPS);
duke@0 640
duke@0 641 private:
duke@0 642 // We pass in the hashtable index so we can calculate it outside of
duke@0 643 // the SystemDictionary_lock.
duke@0 644
duke@0 645 // Basic find on loaded classes
coleenp@3602 646 static Klass* find_class(int index, unsigned int hash,
coleenp@3602 647 Symbol* name, ClassLoaderData* loader_data);
coleenp@3602 648 static Klass* find_class(Symbol* class_name, ClassLoaderData* loader_data);
duke@0 649
duke@0 650 // Basic find on classes in the midst of being loaded
coleenp@3602 651 static Symbol* find_placeholder(Symbol* name, ClassLoaderData* loader_data);
duke@0 652
duke@0 653 // Updating entry in dictionary
duke@0 654 // Add a completely loaded class
coleenp@2062 655 static void add_klass(int index, Symbol* class_name,
coleenp@3602 656 ClassLoaderData* loader_data, KlassHandle obj);
duke@0 657
duke@0 658 // Add a placeholder for a class being loaded
duke@0 659 static void add_placeholder(int index,
coleenp@2062 660 Symbol* class_name,
coleenp@3602 661 ClassLoaderData* loader_data);
duke@0 662 static void remove_placeholder(int index,
coleenp@2062 663 Symbol* class_name,
coleenp@3602 664 ClassLoaderData* loader_data);
duke@0 665
duke@0 666 // Performs cleanups after resolve_super_or_fail. This typically needs
duke@0 667 // to be called on failure.
duke@0 668 // Won't throw, but can block.
coleenp@2062 669 static void resolution_cleanups(Symbol* class_name,
coleenp@3602 670 ClassLoaderData* loader_data,
duke@0 671 TRAPS);
duke@0 672
duke@0 673 // Initialization
duke@0 674 static void initialize_preloaded_classes(TRAPS);
duke@0 675
duke@0 676 // Class loader constraints
duke@0 677 static void check_constraints(int index, unsigned int hash,
duke@0 678 instanceKlassHandle k, Handle loader,
duke@0 679 bool defining, TRAPS);
duke@0 680 static void update_dictionary(int d_index, unsigned int d_hash,
duke@0 681 int p_index, unsigned int p_hash,
coleenp@3602 682 instanceKlassHandle k, Handle loader,
coleenp@3602 683 TRAPS);
duke@0 684
duke@0 685 // Variables holding commonly used klasses (preloaded)
coleenp@3602 686 static Klass* _well_known_klasses[];
duke@0 687
duke@0 688 // Lazily loaded klasses
coleenp@3602 689 static Klass* volatile _abstract_ownable_synchronizer_klass;
duke@0 690
jrose@132 691 // table of box klasses (int_klass, etc.)
coleenp@3602 692 static Klass* _box_klasses[T_VOID+1];
duke@0 693
duke@0 694 static oop _java_system_loader;
duke@0 695
duke@0 696 static bool _has_loadClassInternal;
duke@0 697 static bool _has_checkPackageAccess;
duke@0 698 };
jrose@665 699
stefank@1879 700 #endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP