annotate src/share/vm/classfile/systemDictionary.hpp @ 1142:4ce7240d622c

6914300: ciEnv should export all well known classes Reviewed-by: kvn, twisti
author never
date Wed, 06 Jan 2010 14:22:39 -0800
parents e66fd840cb6b
children cd37471eaecc
rev   line source
duke@0 1 /*
xdono@579 2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 *
duke@0 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@0 20 * CA 95054 USA or visit www.sun.com if you need additional information or
duke@0 21 * have any questions.
duke@0 22 *
duke@0 23 */
duke@0 24
duke@0 25 // The system dictionary stores all loaded classes and maps:
duke@0 26 //
duke@0 27 // [class name,class loader] -> class i.e. [symbolOop,oop] -> klassOop
duke@0 28 //
duke@0 29 // Classes are loaded lazily. The default VM class loader is
duke@0 30 // represented as NULL.
duke@0 31
duke@0 32 // The underlying data structure is an open hash table with a fixed number
duke@0 33 // of buckets. During loading the loader object is locked, (for the VM loader
duke@0 34 // a private lock object is used). Class loading can thus be done concurrently,
duke@0 35 // but only by different loaders.
duke@0 36 //
duke@0 37 // During loading a placeholder (name, loader) is temporarily placed in
duke@0 38 // a side data structure, and is used to detect ClassCircularityErrors
duke@0 39 // and to perform verification during GC. A GC can occur in the midst
duke@0 40 // of class loading, as we call out to Java, have to take locks, etc.
duke@0 41 //
duke@0 42 // When class loading is finished, a new entry is added to the system
duke@0 43 // dictionary and the place holder is removed. Note that the protection
duke@0 44 // domain field of the system dictionary has not yet been filled in when
duke@0 45 // the "real" system dictionary entry is created.
duke@0 46 //
duke@0 47 // Clients of this class who are interested in finding if a class has
duke@0 48 // been completely loaded -- not classes in the process of being loaded --
duke@0 49 // can read the SystemDictionary unlocked. This is safe because
duke@0 50 // - entries are only deleted at safepoints
duke@0 51 // - readers cannot come to a safepoint while actively examining
duke@0 52 // an entry (an entry cannot be deleted from under a reader)
duke@0 53 // - entries must be fully formed before they are available to concurrent
duke@0 54 // readers (we must ensure write ordering)
duke@0 55 //
duke@0 56 // Note that placeholders are deleted at any time, as they are removed
duke@0 57 // when a class is completely loaded. Therefore, readers as well as writers
duke@0 58 // of placeholders must hold the SystemDictionary_lock.
duke@0 59 //
duke@0 60
duke@0 61 class Dictionary;
duke@0 62 class PlaceholderTable;
duke@0 63 class LoaderConstraintTable;
duke@0 64 class HashtableBucket;
duke@0 65 class ResolutionErrorTable;
jrose@710 66 class SymbolPropertyTable;
duke@0 67
jrose@132 68 // Certain classes are preloaded, such as java.lang.Object and java.lang.String.
jrose@132 69 // They are all "well-known", in the sense that no class loader is allowed
jrose@132 70 // to provide a different definition.
jrose@132 71 //
jrose@132 72 // These klasses must all have names defined in vmSymbols.
jrose@132 73
jrose@132 74 #define WK_KLASS_ENUM_NAME(kname) kname##_knum
jrose@132 75
jrose@132 76 // Each well-known class has a short klass name (like object_klass),
jrose@132 77 // a vmSymbol name (like java_lang_Object), and a flag word
jrose@132 78 // that makes some minor distinctions, like whether the klass
jrose@132 79 // is preloaded, optional, release-specific, etc.
jrose@132 80 // The order of these definitions is significant; it is the order in which
jrose@132 81 // preloading is actually performed by initialize_preloaded_classes.
jrose@132 82
jrose@132 83 #define WK_KLASSES_DO(template) \
jrose@132 84 /* well-known classes */ \
never@1142 85 template(Object_klass, java_lang_Object, Pre) \
never@1142 86 template(String_klass, java_lang_String, Pre) \
never@1142 87 template(Class_klass, java_lang_Class, Pre) \
never@1142 88 template(Cloneable_klass, java_lang_Cloneable, Pre) \
never@1142 89 template(ClassLoader_klass, java_lang_ClassLoader, Pre) \
never@1142 90 template(Serializable_klass, java_io_Serializable, Pre) \
never@1142 91 template(System_klass, java_lang_System, Pre) \
never@1142 92 template(Throwable_klass, java_lang_Throwable, Pre) \
never@1142 93 template(Error_klass, java_lang_Error, Pre) \
never@1142 94 template(ThreadDeath_klass, java_lang_ThreadDeath, Pre) \
never@1142 95 template(Exception_klass, java_lang_Exception, Pre) \
never@1142 96 template(RuntimeException_klass, java_lang_RuntimeException, Pre) \
never@1142 97 template(ProtectionDomain_klass, java_security_ProtectionDomain, Pre) \
jrose@132 98 template(AccessControlContext_klass, java_security_AccessControlContext, Pre) \
never@1142 99 template(ClassNotFoundException_klass, java_lang_ClassNotFoundException, Pre) \
never@1142 100 template(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre) \
never@1142 101 template(LinkageError_klass, java_lang_LinkageError, Pre) \
jrose@132 102 template(ClassCastException_klass, java_lang_ClassCastException, Pre) \
jrose@132 103 template(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre) \
never@1142 104 template(VirtualMachineError_klass, java_lang_VirtualMachineError, Pre) \
jrose@132 105 template(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre) \
jrose@132 106 template(StackOverflowError_klass, java_lang_StackOverflowError, Pre) \
jrose@132 107 template(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre) \
never@1142 108 template(Reference_klass, java_lang_ref_Reference, Pre) \
jrose@132 109 \
jrose@132 110 /* Preload ref klasses and set reference types */ \
never@1142 111 template(SoftReference_klass, java_lang_ref_SoftReference, Pre) \
never@1142 112 template(WeakReference_klass, java_lang_ref_WeakReference, Pre) \
never@1142 113 template(FinalReference_klass, java_lang_ref_FinalReference, Pre) \
never@1142 114 template(PhantomReference_klass, java_lang_ref_PhantomReference, Pre) \
never@1142 115 template(Finalizer_klass, java_lang_ref_Finalizer, Pre) \
jrose@132 116 \
never@1142 117 template(Thread_klass, java_lang_Thread, Pre) \
never@1142 118 template(ThreadGroup_klass, java_lang_ThreadGroup, Pre) \
never@1142 119 template(Properties_klass, java_util_Properties, Pre) \
never@1142 120 template(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject, Pre) \
never@1142 121 template(reflect_Field_klass, java_lang_reflect_Field, Pre) \
never@1142 122 template(reflect_Method_klass, java_lang_reflect_Method, Pre) \
never@1142 123 template(reflect_Constructor_klass, java_lang_reflect_Constructor, Pre) \
jrose@132 124 \
jrose@132 125 /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \
jrose@132 126 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
jrose@132 127 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
never@1142 128 template(reflect_MagicAccessorImpl_klass, sun_reflect_MagicAccessorImpl, Opt) \
never@1142 129 template(reflect_MethodAccessorImpl_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \
never@1142 130 template(reflect_ConstructorAccessorImpl_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \
never@1142 131 template(reflect_DelegatingClassLoader_klass, sun_reflect_DelegatingClassLoader, Opt) \
never@1142 132 template(reflect_ConstantPool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15) \
never@1142 133 template(reflect_UnsafeStaticFieldAccessorImpl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15) \
jrose@132 134 \
jrose@710 135 /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \
jrose@710 136 template(MethodHandle_klass, java_dyn_MethodHandle, Opt) \
jrose@710 137 template(MemberName_klass, sun_dyn_MemberName, Opt) \
jrose@710 138 template(MethodHandleImpl_klass, sun_dyn_MethodHandleImpl, Opt) \
jrose@710 139 template(AdapterMethodHandle_klass, sun_dyn_AdapterMethodHandle, Opt) \
jrose@710 140 template(BoundMethodHandle_klass, sun_dyn_BoundMethodHandle, Opt) \
jrose@710 141 template(DirectMethodHandle_klass, sun_dyn_DirectMethodHandle, Opt) \
jrose@710 142 template(MethodType_klass, java_dyn_MethodType, Opt) \
jrose@710 143 template(MethodTypeForm_klass, java_dyn_MethodTypeForm, Opt) \
jrose@710 144 template(WrongMethodTypeException_klass, java_dyn_WrongMethodTypeException, Opt) \
jrose@726 145 template(Linkage_klass, java_dyn_Linkage, Opt) \
jrose@726 146 template(CallSite_klass, java_dyn_CallSite, Opt) \
twisti@1135 147 template(InvokeDynamic_klass, java_dyn_InvokeDynamic, Opt) \
jrose@726 148 /* Note: MethodHandle must be first, and Dynamic last in group */ \
jrose@726 149 \
never@1142 150 template(StringBuffer_klass, java_lang_StringBuffer, Pre) \
never@1080 151 template(StringBuilder_klass, java_lang_StringBuilder, Pre) \
jrose@132 152 \
jrose@132 153 /* It's NULL in non-1.4 JDKs. */ \
never@1142 154 template(StackTraceElement_klass, java_lang_StackTraceElement, Opt) \
jrose@132 155 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
jrose@132 156 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
jrose@132 157 template(java_nio_Buffer_klass, java_nio_Buffer, Opt) \
jrose@132 158 \
jrose@132 159 /* If this class isn't present, it won't be referenced. */ \
jrose@132 160 template(sun_misc_AtomicLongCSImpl_klass, sun_misc_AtomicLongCSImpl, Opt) \
jrose@132 161 \
jrose@132 162 template(sun_jkernel_DownloadManager_klass, sun_jkernel_DownloadManager, Opt_Kernel) \
jrose@132 163 \
jrose@132 164 /* Preload boxing klasses */ \
never@1142 165 template(Boolean_klass, java_lang_Boolean, Pre) \
never@1142 166 template(Character_klass, java_lang_Character, Pre) \
never@1142 167 template(Float_klass, java_lang_Float, Pre) \
never@1142 168 template(Double_klass, java_lang_Double, Pre) \
never@1142 169 template(Byte_klass, java_lang_Byte, Pre) \
never@1142 170 template(Short_klass, java_lang_Short, Pre) \
never@1142 171 template(Integer_klass, java_lang_Integer, Pre) \
never@1142 172 template(Long_klass, java_lang_Long, Pre) \
jrose@132 173 /*end*/
jrose@132 174
jrose@132 175
duke@0 176 class SystemDictionary : AllStatic {
duke@0 177 friend class VMStructs;
duke@0 178 friend class CompactingPermGenGen;
jrose@665 179 friend class SystemDictionaryHandles;
duke@0 180 NOT_PRODUCT(friend class instanceKlassKlass;)
duke@0 181
duke@0 182 public:
jrose@132 183 enum WKID {
jrose@132 184 NO_WKID = 0,
jrose@132 185
jrose@132 186 #define WK_KLASS_ENUM(name, ignore_s, ignore_o) WK_KLASS_ENUM_NAME(name),
jrose@132 187 WK_KLASSES_DO(WK_KLASS_ENUM)
jrose@132 188 #undef WK_KLASS_ENUM
jrose@132 189
jrose@132 190 WKID_LIMIT,
jrose@132 191
jrose@132 192 FIRST_WKID = NO_WKID + 1
jrose@132 193 };
jrose@132 194
jrose@132 195 enum InitOption {
jrose@132 196 Pre, // preloaded; error if not present
jrose@132 197
jrose@132 198 // Order is significant. Options before this point require resolve_or_fail.
jrose@132 199 // Options after this point will use resolve_or_null instead.
jrose@132 200
jrose@132 201 Opt, // preload tried; NULL if not present
jrose@132 202 Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection
jrose@132 203 Opt_Only_JDK15, // preload tried; use only with JDK1.5+
jrose@132 204 Opt_Kernel, // preload tried only #ifdef KERNEL
jrose@132 205 OPTION_LIMIT,
jrose@132 206 CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT)
jrose@132 207 };
jrose@132 208
jrose@132 209
duke@0 210 // Returns a class with a given class name and class loader. Loads the
duke@0 211 // class if needed. If not found a NoClassDefFoundError or a
duke@0 212 // ClassNotFoundException is thrown, depending on the value on the
duke@0 213 // throw_error flag. For most uses the throw_error argument should be set
duke@0 214 // to true.
duke@0 215
duke@0 216 static klassOop resolve_or_fail(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS);
duke@0 217 // Convenient call for null loader and protection domain.
duke@0 218 static klassOop resolve_or_fail(symbolHandle class_name, bool throw_error, TRAPS);
duke@0 219 private:
duke@0 220 // handle error translation for resolve_or_null results
duke@0 221 static klassOop handle_resolution_exception(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS);
duke@0 222
duke@0 223 public:
duke@0 224
duke@0 225 // Returns a class with a given class name and class loader.
duke@0 226 // Loads the class if needed. If not found NULL is returned.
duke@0 227 static klassOop resolve_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS);
duke@0 228 // Version with null loader and protection domain
duke@0 229 static klassOop resolve_or_null(symbolHandle class_name, TRAPS);
duke@0 230
duke@0 231 // Resolve a superclass or superinterface. Called from ClassFileParser,
duke@0 232 // parse_interfaces, resolve_instance_class_or_null, load_shared_class
duke@0 233 // "child_name" is the class whose super class or interface is being resolved.
duke@0 234 static klassOop resolve_super_or_fail(symbolHandle child_name,
duke@0 235 symbolHandle class_name,
duke@0 236 Handle class_loader,
duke@0 237 Handle protection_domain,
duke@0 238 bool is_superclass,
duke@0 239 TRAPS);
duke@0 240
duke@0 241 // Parse new stream. This won't update the system dictionary or
duke@0 242 // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses.
duke@0 243 static klassOop parse_stream(symbolHandle class_name,
duke@0 244 Handle class_loader,
duke@0 245 Handle protection_domain,
duke@0 246 ClassFileStream* st,
jrose@431 247 TRAPS) {
jrose@431 248 KlassHandle nullHandle;
jrose@431 249 return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD);
jrose@431 250 }
jrose@431 251 static klassOop parse_stream(symbolHandle class_name,
jrose@431 252 Handle class_loader,
jrose@431 253 Handle protection_domain,
jrose@431 254 ClassFileStream* st,
jrose@431 255 KlassHandle host_klass,
jrose@431 256 GrowableArray<Handle>* cp_patches,
duke@0 257 TRAPS);
duke@0 258
duke@0 259 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass)
acorn@973 260 static klassOop resolve_from_stream(symbolHandle class_name, Handle class_loader,
acorn@973 261 Handle protection_domain,
acorn@973 262 ClassFileStream* st, bool verify, TRAPS);
duke@0 263
duke@0 264 // Lookup an already loaded class. If not found NULL is returned.
duke@0 265 static klassOop find(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS);
duke@0 266
duke@0 267 // Lookup an already loaded instance or array class.
duke@0 268 // Do not make any queries to class loaders; consult only the cache.
duke@0 269 // If not found NULL is returned.
duke@0 270 static klassOop find_instance_or_array_klass(symbolHandle class_name,
duke@0 271 Handle class_loader,
duke@0 272 Handle protection_domain,
duke@0 273 TRAPS);
duke@0 274
jrose@132 275 // If the given name is known to vmSymbols, return the well-know klass:
jrose@132 276 static klassOop find_well_known_klass(symbolOop class_name);
jrose@132 277
duke@0 278 // Lookup an instance or array class that has already been loaded
duke@0 279 // either into the given class loader, or else into another class
duke@0 280 // loader that is constrained (via loader constraints) to produce
duke@0 281 // a consistent class. Do not take protection domains into account.
duke@0 282 // Do not make any queries to class loaders; consult only the cache.
duke@0 283 // Return NULL if the class is not found.
duke@0 284 //
duke@0 285 // This function is a strict superset of find_instance_or_array_klass.
duke@0 286 // This function (the unchecked version) makes a conservative prediction
duke@0 287 // of the result of the checked version, assuming successful lookup.
duke@0 288 // If both functions return non-null, they must return the same value.
duke@0 289 // Also, the unchecked version may sometimes be non-null where the
duke@0 290 // checked version is null. This can occur in several ways:
duke@0 291 // 1. No query has yet been made to the class loader.
duke@0 292 // 2. The class loader was queried, but chose not to delegate.
duke@0 293 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain.
duke@0 294 // 4. Loading was attempted, but there was a linkage error of some sort.
duke@0 295 // In all of these cases, the loader constraints on this type are
duke@0 296 // satisfied, and it is safe for classes in the given class loader
duke@0 297 // to manipulate strongly-typed values of the found class, subject
duke@0 298 // to local linkage and access checks.
duke@0 299 static klassOop find_constrained_instance_or_array_klass(symbolHandle class_name,
duke@0 300 Handle class_loader,
duke@0 301 TRAPS);
duke@0 302
duke@0 303 // Iterate over all klasses in dictionary
duke@0 304 // Just the classes from defining class loaders
duke@0 305 static void classes_do(void f(klassOop));
duke@0 306 // Added for initialize_itable_for_klass to handle exceptions
duke@0 307 static void classes_do(void f(klassOop, TRAPS), TRAPS);
duke@0 308 // All classes, and their class loaders
duke@0 309 static void classes_do(void f(klassOop, oop));
duke@0 310 // All classes, and their class loaders
duke@0 311 // (added for helpers that use HandleMarks and ResourceMarks)
duke@0 312 static void classes_do(void f(klassOop, oop, TRAPS), TRAPS);
duke@0 313 // All entries in the placeholder table and their class loaders
duke@0 314 static void placeholders_do(void f(symbolOop, oop));
duke@0 315
duke@0 316 // Iterate over all methods in all klasses in dictionary
duke@0 317 static void methods_do(void f(methodOop));
duke@0 318
duke@0 319 // Garbage collection support
duke@0 320
duke@0 321 // This method applies "blk->do_oop" to all the pointers to "system"
duke@0 322 // classes and loaders.
duke@0 323 static void always_strong_oops_do(OopClosure* blk);
duke@0 324 static void always_strong_classes_do(OopClosure* blk);
duke@0 325 // This method applies "blk->do_oop" to all the placeholders.
duke@0 326 static void placeholders_do(OopClosure* blk);
duke@0 327
duke@0 328 // Unload (that is, break root links to) all unmarked classes and
duke@0 329 // loaders. Returns "true" iff something was unloaded.
duke@0 330 static bool do_unloading(BoolObjectClosure* is_alive);
duke@0 331
duke@0 332 // Applies "f->do_oop" to all root oops in the system dictionary.
duke@0 333 static void oops_do(OopClosure* f);
duke@0 334
duke@0 335 // System loader lock
duke@0 336 static oop system_loader_lock() { return _system_loader_lock_obj; }
duke@0 337
duke@0 338 private:
duke@0 339 // Traverses preloaded oops: various system classes. These are
duke@0 340 // guaranteed to be in the perm gen.
duke@0 341 static void preloaded_oops_do(OopClosure* f);
duke@0 342 static void lazily_loaded_oops_do(OopClosure* f);
duke@0 343
duke@0 344 public:
duke@0 345 // Sharing support.
duke@0 346 static void reorder_dictionary();
duke@0 347 static void copy_buckets(char** top, char* end);
duke@0 348 static void copy_table(char** top, char* end);
duke@0 349 static void reverse();
duke@0 350 static void set_shared_dictionary(HashtableBucket* t, int length,
duke@0 351 int number_of_entries);
duke@0 352 // Printing
duke@0 353 static void print() PRODUCT_RETURN;
duke@0 354 static void print_class_statistics() PRODUCT_RETURN;
duke@0 355 static void print_method_statistics() PRODUCT_RETURN;
duke@0 356
duke@0 357 // Number of contained klasses
duke@0 358 // This is both fully loaded classes and classes in the process
duke@0 359 // of being loaded
duke@0 360 static int number_of_classes();
duke@0 361
duke@0 362 // Monotonically increasing counter which grows as classes are
duke@0 363 // loaded or modifications such as hot-swapping or setting/removing
duke@0 364 // of breakpoints are performed
duke@0 365 static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; }
duke@0 366 // Needed by evolution and breakpoint code
duke@0 367 static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; }
duke@0 368
duke@0 369 // Verification
duke@0 370 static void verify();
duke@0 371
duke@0 372 #ifdef ASSERT
duke@0 373 static bool is_internal_format(symbolHandle class_name);
duke@0 374 #endif
duke@0 375
duke@0 376 // Verify class is in dictionary
duke@0 377 static void verify_obj_klass_present(Handle obj,
duke@0 378 symbolHandle class_name,
duke@0 379 Handle class_loader);
duke@0 380
duke@0 381 // Initialization
duke@0 382 static void initialize(TRAPS);
duke@0 383
duke@0 384 // Fast access to commonly used classes (preloaded)
duke@0 385 static klassOop check_klass(klassOop k) {
duke@0 386 assert(k != NULL, "preloaded klass not initialized");
duke@0 387 return k;
duke@0 388 }
duke@0 389
jrose@132 390 static klassOop check_klass_Pre(klassOop k) { return check_klass(k); }
jrose@132 391 static klassOop check_klass_Opt(klassOop k) { return k; }
jrose@132 392 static klassOop check_klass_Opt_Kernel(klassOop k) { return k; } //== Opt
jrose@132 393 static klassOop check_klass_Opt_Only_JDK15(klassOop k) {
jrose@132 394 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only");
jrose@132 395 return k;
jrose@132 396 }
jrose@132 397 static klassOop check_klass_Opt_Only_JDK14NewRef(klassOop k) {
duke@0 398 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only");
jrose@132 399 // despite the optional loading, if you use this it must be present:
jrose@132 400 return check_klass(k);
duke@0 401 }
duke@0 402
jrose@132 403 static bool initialize_wk_klass(WKID id, int init_opt, TRAPS);
jrose@132 404 static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS);
jrose@132 405 static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) {
jrose@132 406 int limit = (int)end_id + 1;
jrose@132 407 initialize_wk_klasses_until((WKID) limit, start_id, THREAD);
jrose@132 408 }
duke@0 409
jrose@132 410 public:
jrose@132 411 #define WK_KLASS_DECLARE(name, ignore_symbol, option) \
jrose@132 412 static klassOop name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); }
jrose@132 413 WK_KLASSES_DO(WK_KLASS_DECLARE);
jrose@132 414 #undef WK_KLASS_DECLARE
duke@0 415
jrose@132 416 // Local definition for direct access to the private array:
jrose@147 417 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]
duke@0 418
duke@0 419 static klassOop box_klass(BasicType t) {
duke@0 420 assert((uint)t < T_VOID+1, "range check");
duke@0 421 return check_klass(_box_klasses[t]);
duke@0 422 }
duke@0 423 static BasicType box_klass_type(klassOop k); // inverse of box_klass
duke@0 424
duke@0 425 // methods returning lazily loaded klasses
duke@0 426 // The corresponding method to load the class must be called before calling them.
duke@0 427 static klassOop abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); }
duke@0 428
duke@0 429 static void load_abstract_ownable_synchronizer_klass(TRAPS);
duke@0 430
duke@0 431 private:
duke@0 432 // Tells whether ClassLoader.loadClassInternal is present
duke@0 433 static bool has_loadClassInternal() { return _has_loadClassInternal; }
duke@0 434
duke@0 435 public:
duke@0 436 // Tells whether ClassLoader.checkPackageAccess is present
duke@0 437 static bool has_checkPackageAccess() { return _has_checkPackageAccess; }
duke@0 438
never@1142 439 static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; }
never@1142 440 static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; }
duke@0 441
duke@0 442 // Returns default system loader
duke@0 443 static oop java_system_loader();
duke@0 444
duke@0 445 // Compute the default system loader
duke@0 446 static void compute_java_system_loader(TRAPS);
duke@0 447
duke@0 448 private:
duke@0 449 // Mirrors for primitive classes (created eagerly)
duke@0 450 static oop check_mirror(oop m) {
duke@0 451 assert(m != NULL, "mirror not initialized");
duke@0 452 return m;
duke@0 453 }
duke@0 454
duke@0 455 public:
duke@0 456 // Note: java_lang_Class::primitive_type is the inverse of java_mirror
duke@0 457
duke@0 458 // Check class loader constraints
duke@0 459 static bool add_loader_constraint(symbolHandle name, Handle loader1,
duke@0 460 Handle loader2, TRAPS);
duke@0 461 static char* check_signature_loaders(symbolHandle signature, Handle loader1,
duke@0 462 Handle loader2, bool is_method, TRAPS);
duke@0 463
jrose@710 464 // JSR 292
jrose@710 465 // find the java.dyn.MethodHandles::invoke method for a given signature
jrose@710 466 static methodOop find_method_handle_invoke(symbolHandle signature,
jrose@710 467 Handle class_loader,
jrose@710 468 Handle protection_domain,
jrose@710 469 TRAPS);
jrose@710 470 // ask Java to compute the java.dyn.MethodType object for a given signature
jrose@710 471 static Handle compute_method_handle_type(symbolHandle signature,
jrose@710 472 Handle class_loader,
jrose@710 473 Handle protection_domain,
jrose@710 474 TRAPS);
jrose@726 475 // ask Java to create a dynamic call site, while linking an invokedynamic op
jrose@726 476 static Handle make_dynamic_call_site(KlassHandle caller,
jrose@726 477 int caller_method_idnum,
jrose@726 478 int caller_bci,
jrose@726 479 symbolHandle name,
jrose@726 480 methodHandle mh_invoke,
jrose@726 481 TRAPS);
jrose@726 482
jrose@726 483 // coordinate with Java about bootstrap methods
jrose@726 484 static Handle find_bootstrap_method(KlassHandle caller,
jrose@726 485 // This argument is non-null only when a
jrose@726 486 // classfile attribute has been found:
jrose@726 487 KlassHandle search_bootstrap_klass,
jrose@726 488 TRAPS);
jrose@726 489
duke@0 490 // Utility for printing loader "name" as part of tracing constraints
duke@0 491 static const char* loader_name(oop loader) {
duke@0 492 return ((loader) == NULL ? "<bootloader>" :
duke@0 493 instanceKlass::cast((loader)->klass())->name()->as_C_string() );
duke@0 494 }
duke@0 495
duke@0 496 // Record the error when the first attempt to resolve a reference from a constant
duke@0 497 // pool entry to a class fails.
duke@0 498 static void add_resolution_error(constantPoolHandle pool, int which, symbolHandle error);
duke@0 499 static symbolOop find_resolution_error(constantPoolHandle pool, int which);
duke@0 500
duke@0 501 private:
duke@0 502
duke@0 503 enum Constants {
duke@0 504 _loader_constraint_size = 107, // number of entries in constraint table
duke@0 505 _resolution_error_size = 107, // number of entries in resolution error table
jrose@710 506 _invoke_method_size = 139, // number of entries in invoke method table
duke@0 507 _nof_buckets = 1009 // number of buckets in hash table
duke@0 508 };
duke@0 509
duke@0 510
duke@0 511 // Static variables
duke@0 512
duke@0 513 // Hashtable holding loaded classes.
duke@0 514 static Dictionary* _dictionary;
duke@0 515
duke@0 516 // Hashtable holding placeholders for classes being loaded.
duke@0 517 static PlaceholderTable* _placeholders;
duke@0 518
duke@0 519 // Hashtable holding classes from the shared archive.
duke@0 520 static Dictionary* _shared_dictionary;
duke@0 521
duke@0 522 // Monotonically increasing counter which grows with
duke@0 523 // _number_of_classes as well as hot-swapping and breakpoint setting
duke@0 524 // and removal.
duke@0 525 static int _number_of_modifications;
duke@0 526
duke@0 527 // Lock object for system class loader
duke@0 528 static oop _system_loader_lock_obj;
duke@0 529
duke@0 530 // Constraints on class loaders
duke@0 531 static LoaderConstraintTable* _loader_constraints;
duke@0 532
duke@0 533 // Resolution errors
duke@0 534 static ResolutionErrorTable* _resolution_errors;
duke@0 535
jrose@710 536 // Invoke methods (JSR 292)
jrose@710 537 static SymbolPropertyTable* _invoke_method_table;
jrose@710 538
duke@0 539 public:
duke@0 540 // for VM_CounterDecay iteration support
duke@0 541 friend class CounterDecay;
duke@0 542 static klassOop try_get_next_class();
duke@0 543
duke@0 544 private:
duke@0 545 static void validate_protection_domain(instanceKlassHandle klass,
duke@0 546 Handle class_loader,
duke@0 547 Handle protection_domain, TRAPS);
duke@0 548
duke@0 549 friend class VM_PopulateDumpSharedSpace;
duke@0 550 friend class TraversePlaceholdersClosure;
duke@0 551 static Dictionary* dictionary() { return _dictionary; }
duke@0 552 static Dictionary* shared_dictionary() { return _shared_dictionary; }
duke@0 553 static PlaceholderTable* placeholders() { return _placeholders; }
duke@0 554 static LoaderConstraintTable* constraints() { return _loader_constraints; }
duke@0 555 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; }
jrose@710 556 static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; }
duke@0 557
duke@0 558 // Basic loading operations
duke@0 559 static klassOop resolve_instance_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS);
duke@0 560 static klassOop resolve_array_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS);
duke@0 561 static instanceKlassHandle handle_parallel_super_load(symbolHandle class_name, symbolHandle supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS);
duke@0 562 // Wait on SystemDictionary_lock; unlocks lockObject before
duke@0 563 // waiting; relocks lockObject with correct recursion count
duke@0 564 // after waiting, but before reentering SystemDictionary_lock
duke@0 565 // to preserve lock order semantics.
duke@0 566 static void double_lock_wait(Handle lockObject, TRAPS);
duke@0 567 static void define_instance_class(instanceKlassHandle k, TRAPS);
duke@0 568 static instanceKlassHandle find_or_define_instance_class(symbolHandle class_name,
duke@0 569 Handle class_loader,
duke@0 570 instanceKlassHandle k, TRAPS);
duke@0 571 static instanceKlassHandle load_shared_class(symbolHandle class_name,
duke@0 572 Handle class_loader, TRAPS);
duke@0 573 static instanceKlassHandle load_shared_class(instanceKlassHandle ik,
duke@0 574 Handle class_loader, TRAPS);
duke@0 575 static instanceKlassHandle load_instance_class(symbolHandle class_name, Handle class_loader, TRAPS);
duke@0 576 static Handle compute_loader_lock_object(Handle class_loader, TRAPS);
duke@0 577 static void check_loader_lock_contention(Handle loader_lock, TRAPS);
acorn@514 578 static bool is_parallelCapable(Handle class_loader);
acorn@1075 579 static bool is_parallelDefine(Handle class_loader);
duke@0 580
duke@0 581 static klassOop find_shared_class(symbolHandle class_name);
duke@0 582
duke@0 583 // Setup link to hierarchy
duke@0 584 static void add_to_hierarchy(instanceKlassHandle k, TRAPS);
duke@0 585
duke@0 586 private:
duke@0 587 // We pass in the hashtable index so we can calculate it outside of
duke@0 588 // the SystemDictionary_lock.
duke@0 589
duke@0 590 // Basic find on loaded classes
duke@0 591 static klassOop find_class(int index, unsigned int hash,
duke@0 592 symbolHandle name, Handle loader);
duke@0 593
duke@0 594 // Basic find on classes in the midst of being loaded
duke@0 595 static symbolOop find_placeholder(int index, unsigned int hash,
duke@0 596 symbolHandle name, Handle loader);
duke@0 597
duke@0 598 // Basic find operation of loaded classes and classes in the midst
duke@0 599 // of loading; used for assertions and verification only.
duke@0 600 static oop find_class_or_placeholder(symbolHandle class_name,
duke@0 601 Handle class_loader);
duke@0 602
duke@0 603 // Updating entry in dictionary
duke@0 604 // Add a completely loaded class
duke@0 605 static void add_klass(int index, symbolHandle class_name,
duke@0 606 Handle class_loader, KlassHandle obj);
duke@0 607
duke@0 608 // Add a placeholder for a class being loaded
duke@0 609 static void add_placeholder(int index,
duke@0 610 symbolHandle class_name,
duke@0 611 Handle class_loader);
duke@0 612 static void remove_placeholder(int index,
duke@0 613 symbolHandle class_name,
duke@0 614 Handle class_loader);
duke@0 615
duke@0 616 // Performs cleanups after resolve_super_or_fail. This typically needs
duke@0 617 // to be called on failure.
duke@0 618 // Won't throw, but can block.
duke@0 619 static void resolution_cleanups(symbolHandle class_name,
duke@0 620 Handle class_loader,
duke@0 621 TRAPS);
duke@0 622
duke@0 623 // Initialization
duke@0 624 static void initialize_preloaded_classes(TRAPS);
duke@0 625
duke@0 626 // Class loader constraints
duke@0 627 static void check_constraints(int index, unsigned int hash,
duke@0 628 instanceKlassHandle k, Handle loader,
duke@0 629 bool defining, TRAPS);
duke@0 630 static void update_dictionary(int d_index, unsigned int d_hash,
duke@0 631 int p_index, unsigned int p_hash,
duke@0 632 instanceKlassHandle k, Handle loader, TRAPS);
duke@0 633
duke@0 634 // Variables holding commonly used klasses (preloaded)
jrose@132 635 static klassOop _well_known_klasses[];
duke@0 636
duke@0 637 // Lazily loaded klasses
duke@0 638 static volatile klassOop _abstract_ownable_synchronizer_klass;
duke@0 639
jrose@132 640 // table of box klasses (int_klass, etc.)
duke@0 641 static klassOop _box_klasses[T_VOID+1];
duke@0 642
duke@0 643 static oop _java_system_loader;
duke@0 644
duke@0 645 static bool _has_loadClassInternal;
duke@0 646 static bool _has_checkPackageAccess;
duke@0 647 };
jrose@665 648
jrose@665 649 // Cf. vmSymbols vs. vmSymbolHandles
jrose@665 650 class SystemDictionaryHandles : AllStatic {
jrose@665 651 public:
jrose@665 652 #define WK_KLASS_HANDLE_DECLARE(name, ignore_symbol, option) \
jrose@665 653 static KlassHandle name() { \
jrose@665 654 SystemDictionary::name(); \
jrose@665 655 klassOop* loc = &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \
jrose@665 656 return KlassHandle(loc, true); \
jrose@665 657 }
jrose@665 658 WK_KLASSES_DO(WK_KLASS_HANDLE_DECLARE);
jrose@665 659 #undef WK_KLASS_HANDLE_DECLARE
jrose@665 660
jrose@665 661 static KlassHandle box_klass(BasicType t);
jrose@665 662 };