annotate src/share/vm/classfile/systemDictionary.hpp @ 3602:da91efe96a93

6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents 1d7922586cf6
children f6b0eb4e44cf
rev   line source
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
jrose@132 95 #define WK_KLASSES_DO(template) \
jrose@132 96 /* well-known classes */ \
never@1142 97 template(Object_klass, java_lang_Object, Pre) \
never@1142 98 template(String_klass, java_lang_String, Pre) \
never@1142 99 template(Class_klass, java_lang_Class, Pre) \
never@1142 100 template(Cloneable_klass, java_lang_Cloneable, Pre) \
never@1142 101 template(ClassLoader_klass, java_lang_ClassLoader, Pre) \
never@1142 102 template(Serializable_klass, java_io_Serializable, Pre) \
never@1142 103 template(System_klass, java_lang_System, Pre) \
never@1142 104 template(Throwable_klass, java_lang_Throwable, Pre) \
never@1142 105 template(Error_klass, java_lang_Error, Pre) \
never@1142 106 template(ThreadDeath_klass, java_lang_ThreadDeath, Pre) \
never@1142 107 template(Exception_klass, java_lang_Exception, Pre) \
never@1142 108 template(RuntimeException_klass, java_lang_RuntimeException, Pre) \
never@1142 109 template(ProtectionDomain_klass, java_security_ProtectionDomain, Pre) \
jrose@132 110 template(AccessControlContext_klass, java_security_AccessControlContext, Pre) \
never@1142 111 template(ClassNotFoundException_klass, java_lang_ClassNotFoundException, Pre) \
never@1142 112 template(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre) \
never@1142 113 template(LinkageError_klass, java_lang_LinkageError, Pre) \
jrose@132 114 template(ClassCastException_klass, java_lang_ClassCastException, Pre) \
jrose@132 115 template(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre) \
never@1142 116 template(VirtualMachineError_klass, java_lang_VirtualMachineError, Pre) \
jrose@132 117 template(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre) \
jrose@132 118 template(StackOverflowError_klass, java_lang_StackOverflowError, Pre) \
jrose@132 119 template(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre) \
never@1142 120 template(Reference_klass, java_lang_ref_Reference, Pre) \
jrose@132 121 \
jrose@132 122 /* Preload ref klasses and set reference types */ \
never@1142 123 template(SoftReference_klass, java_lang_ref_SoftReference, Pre) \
never@1142 124 template(WeakReference_klass, java_lang_ref_WeakReference, Pre) \
never@1142 125 template(FinalReference_klass, java_lang_ref_FinalReference, Pre) \
never@1142 126 template(PhantomReference_klass, java_lang_ref_PhantomReference, Pre) \
never@1142 127 template(Finalizer_klass, java_lang_ref_Finalizer, Pre) \
jrose@132 128 \
never@1142 129 template(Thread_klass, java_lang_Thread, Pre) \
never@1142 130 template(ThreadGroup_klass, java_lang_ThreadGroup, Pre) \
never@1142 131 template(Properties_klass, java_util_Properties, Pre) \
never@1142 132 template(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject, Pre) \
never@1142 133 template(reflect_Field_klass, java_lang_reflect_Field, Pre) \
never@1142 134 template(reflect_Method_klass, java_lang_reflect_Method, Pre) \
never@1142 135 template(reflect_Constructor_klass, java_lang_reflect_Constructor, Pre) \
jrose@132 136 \
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. */ \
never@2702 140 template(reflect_MagicAccessorImpl_klass, sun_reflect_MagicAccessorImpl, Opt) \
never@2702 141 template(reflect_MethodAccessorImpl_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \
never@2702 142 template(reflect_ConstructorAccessorImpl_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \
never@2702 143 template(reflect_DelegatingClassLoader_klass, sun_reflect_DelegatingClassLoader, Opt) \
never@2702 144 template(reflect_ConstantPool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15) \
never@2702 145 template(reflect_UnsafeStaticFieldAccessorImpl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15) \
jrose@132 146 \
jrose@710 147 /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \
twisti@2615 148 template(MethodHandle_klass, java_lang_invoke_MethodHandle, Pre_JSR292) \
twisti@2615 149 template(MemberName_klass, java_lang_invoke_MemberName, Pre_JSR292) \
twisti@2615 150 template(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives, Pre_JSR292) \
twisti@3534 151 template(LambdaForm_klass, java_lang_invoke_LambdaForm, Opt) \
twisti@2615 152 template(MethodType_klass, java_lang_invoke_MethodType, Pre_JSR292) \
twisti@2615 153 template(BootstrapMethodError_klass, java_lang_BootstrapMethodError, Pre_JSR292) \
twisti@2615 154 template(CallSite_klass, java_lang_invoke_CallSite, Pre_JSR292) \
twisti@2615 155 template(ConstantCallSite_klass, java_lang_invoke_ConstantCallSite, Pre_JSR292) \
twisti@2615 156 template(MutableCallSite_klass, java_lang_invoke_MutableCallSite, Pre_JSR292) \
twisti@2615 157 template(VolatileCallSite_klass, java_lang_invoke_VolatileCallSite, Pre_JSR292) \
twisti@2615 158 /* Note: MethodHandle must be first, and VolatileCallSite last in group */ \
jrose@726 159 \
never@1142 160 template(StringBuffer_klass, java_lang_StringBuffer, Pre) \
never@1080 161 template(StringBuilder_klass, java_lang_StringBuilder, Pre) \
jrose@132 162 \
jrose@132 163 /* It's NULL in non-1.4 JDKs. */ \
never@1142 164 template(StackTraceElement_klass, java_lang_StackTraceElement, Opt) \
jrose@132 165 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
jrose@132 166 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
never@2702 167 template(nio_Buffer_klass, java_nio_Buffer, Opt) \
jrose@132 168 \
never@2702 169 template(DownloadManager_klass, sun_jkernel_DownloadManager, Opt_Kernel) \
jrose@132 170 \
never@2702 171 template(PostVMInitHook_klass, sun_misc_PostVMInitHook, Opt) \
kevinw@2014 172 \
jrose@132 173 /* Preload boxing klasses */ \
never@1142 174 template(Boolean_klass, java_lang_Boolean, Pre) \
never@1142 175 template(Character_klass, java_lang_Character, Pre) \
never@1142 176 template(Float_klass, java_lang_Float, Pre) \
never@1142 177 template(Double_klass, java_lang_Double, Pre) \
never@1142 178 template(Byte_klass, java_lang_Byte, Pre) \
never@1142 179 template(Short_klass, java_lang_Short, Pre) \
never@1142 180 template(Integer_klass, java_lang_Integer, Pre) \
never@1142 181 template(Long_klass, java_lang_Long, Pre) \
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@2263 204 Pre_JSR292, // preloaded if EnableInvokeDynamic
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
coleenp@3602 395 static Klass* check_klass_Pre(Klass* k) { return check_klass(k); }
coleenp@3602 396 static Klass* check_klass_Pre_JSR292(Klass* k) { return EnableInvokeDynamic ? check_klass(k) : k; }
coleenp@3602 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
jrose@132 416 public:
never@2702 417 #define WK_KLASS_DECLARE(name, symbol, option) \
coleenp@3602 418 static Klass* name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } \
coleenp@3602 419 static Klass** name##_addr() { \
coleenp@3602 420 return &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \
coleenp@3602 421 }
jrose@132 422 WK_KLASSES_DO(WK_KLASS_DECLARE);
jrose@132 423 #undef WK_KLASS_DECLARE
duke@0 424
coleenp@3602 425 static Klass* well_known_klass(WKID id) {
never@2702 426 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob");
never@2702 427 return _well_known_klasses[id];
never@2702 428 }
never@2702 429
coleenp@3602 430 static Klass** well_known_klass_addr(WKID id) {
coleenp@3602 431 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob");
coleenp@3602 432 return &_well_known_klasses[id];
coleenp@3602 433 }
coleenp@3602 434
jrose@132 435 // Local definition for direct access to the private array:
jrose@147 436 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]
duke@0 437
coleenp@3602 438 static Klass* box_klass(BasicType t) {
duke@0 439 assert((uint)t < T_VOID+1, "range check");
duke@0 440 return check_klass(_box_klasses[t]);
duke@0 441 }
coleenp@3602 442 static BasicType box_klass_type(Klass* k); // inverse of box_klass
duke@0 443
duke@0 444 // methods returning lazily loaded klasses
duke@0 445 // The corresponding method to load the class must be called before calling them.
coleenp@3602 446 static Klass* abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); }
duke@0 447
duke@0 448 static void load_abstract_ownable_synchronizer_klass(TRAPS);
duke@0 449
duke@0 450 private:
duke@0 451 // Tells whether ClassLoader.loadClassInternal is present
duke@0 452 static bool has_loadClassInternal() { return _has_loadClassInternal; }
duke@0 453
coleenp@3602 454 // Returns the class loader data to be used when looking up/updating the
coleenp@3602 455 // system dictionary.
coleenp@3602 456 static ClassLoaderData *class_loader_data(Handle class_loader) {
coleenp@3602 457 return ClassLoaderData::class_loader_data(class_loader());
coleenp@3602 458 }
coleenp@3602 459
duke@0 460 public:
duke@0 461 // Tells whether ClassLoader.checkPackageAccess is present
duke@0 462 static bool has_checkPackageAccess() { return _has_checkPackageAccess; }
duke@0 463
never@1142 464 static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; }
never@1142 465 static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; }
coleenp@3602 466 static bool Object_klass_loaded() { return WK_KLASS(Object_klass) != NULL; }
coleenp@3602 467 static bool ClassLoader_klass_loaded() { return WK_KLASS(ClassLoader_klass) != NULL; }
duke@0 468
duke@0 469 // Returns default system loader
duke@0 470 static oop java_system_loader();
duke@0 471
duke@0 472 // Compute the default system loader
duke@0 473 static void compute_java_system_loader(TRAPS);
duke@0 474
coleenp@3602 475 // Register a new class loader
coleenp@3602 476 static ClassLoaderData* register_loader(Handle class_loader);
duke@0 477 private:
duke@0 478 // Mirrors for primitive classes (created eagerly)
duke@0 479 static oop check_mirror(oop m) {
duke@0 480 assert(m != NULL, "mirror not initialized");
duke@0 481 return m;
duke@0 482 }
duke@0 483
duke@0 484 public:
duke@0 485 // Note: java_lang_Class::primitive_type is the inverse of java_mirror
duke@0 486
duke@0 487 // Check class loader constraints
coleenp@2062 488 static bool add_loader_constraint(Symbol* name, Handle loader1,
duke@0 489 Handle loader2, TRAPS);
coleenp@2062 490 static char* check_signature_loaders(Symbol* signature, Handle loader1,
duke@0 491 Handle loader2, bool is_method, TRAPS);
duke@0 492
jrose@710 493 // JSR 292
twisti@3534 494 // find a java.lang.invoke.MethodHandle.invoke* method for a given signature
twisti@3534 495 // (asks Java to compute it if necessary, except in a compiler thread)
twisti@3534 496 static methodHandle find_method_handle_invoker(Symbol* name,
twisti@3534 497 Symbol* signature,
twisti@3534 498 KlassHandle accessing_klass,
twisti@3534 499 Handle *appendix_result,
twisti@3534 500 TRAPS);
twisti@3534 501 // for a given signature, find the internal MethodHandle method (linkTo* or invokeBasic)
twisti@3534 502 // (does not ask Java, since this is a low-level intrinsic defined by the JVM)
twisti@3534 503 static methodHandle find_method_handle_intrinsic(vmIntrinsics::ID iid,
twisti@3534 504 Symbol* signature,
twisti@3534 505 TRAPS);
twisti@3534 506 // find a java.lang.invoke.MethodType object for a given signature
twisti@3534 507 // (asks Java to compute it if necessary, except in a compiler thread)
coleenp@2062 508 static Handle find_method_handle_type(Symbol* signature,
jrose@1428 509 KlassHandle accessing_klass,
jrose@1427 510 TRAPS);
twisti@3534 511
jrose@2204 512 // ask Java to compute a java.lang.invoke.MethodHandle object for a given CP entry
jrose@1522 513 static Handle link_method_handle_constant(KlassHandle caller,
jrose@1522 514 int ref_kind, //e.g., JVM_REF_invokeVirtual
jrose@1522 515 KlassHandle callee,
coleenp@2062 516 Symbol* name,
coleenp@2062 517 Symbol* signature,
jrose@1522 518 TRAPS);
twisti@3534 519
jrose@726 520 // ask Java to create a dynamic call site, while linking an invokedynamic op
twisti@3534 521 static methodHandle find_dynamic_call_site_invoker(KlassHandle caller,
twisti@3534 522 Handle bootstrap_method,
twisti@3534 523 Symbol* name,
twisti@3534 524 Symbol* type,
twisti@3534 525 Handle *appendix_result,
twisti@3534 526 TRAPS);
jrose@726 527
duke@0 528 // Utility for printing loader "name" as part of tracing constraints
duke@0 529 static const char* loader_name(oop loader) {
duke@0 530 return ((loader) == NULL ? "<bootloader>" :
coleenp@3602 531 InstanceKlass::cast((loader)->klass())->name()->as_C_string() );
coleenp@3602 532 }
coleenp@3602 533 static const char* loader_name(ClassLoaderData* loader_data) {
coleenp@3602 534 return (loader_data->is_the_null_class_loader_data() ? "<bootloader>" :
coleenp@3602 535 InstanceKlass::cast((loader_data->class_loader())->klass())->name()->as_C_string() );
duke@0 536 }
duke@0 537
duke@0 538 // Record the error when the first attempt to resolve a reference from a constant
duke@0 539 // pool entry to a class fails.
coleenp@2062 540 static void add_resolution_error(constantPoolHandle pool, int which, Symbol* error);
coleenp@3602 541 static void delete_resolution_error(ConstantPool* pool);
coleenp@2062 542 static Symbol* find_resolution_error(constantPoolHandle pool, int which);
duke@0 543
duke@0 544 private:
duke@0 545
duke@0 546 enum Constants {
duke@0 547 _loader_constraint_size = 107, // number of entries in constraint table
duke@0 548 _resolution_error_size = 107, // number of entries in resolution error table
jrose@710 549 _invoke_method_size = 139, // number of entries in invoke method table
acorn@3056 550 _nof_buckets = 1009, // number of buckets in hash table for placeholders
acorn@3056 551 _old_default_sdsize = 1009, // backward compat for system dictionary size
acorn@3056 552 _prime_array_size = 8, // array of primes for system dictionary size
acorn@3056 553 _average_depth_goal = 3 // goal for lookup length
duke@0 554 };
duke@0 555
duke@0 556
duke@0 557 // Static variables
duke@0 558
acorn@3056 559 // hashtable sizes for system dictionary to allow growth
acorn@3056 560 // prime numbers for system dictionary size
acorn@3056 561 static int _sdgeneration;
acorn@3056 562 static const int _primelist[_prime_array_size];
acorn@3056 563
duke@0 564 // Hashtable holding loaded classes.
duke@0 565 static Dictionary* _dictionary;
duke@0 566
duke@0 567 // Hashtable holding placeholders for classes being loaded.
duke@0 568 static PlaceholderTable* _placeholders;
duke@0 569
duke@0 570 // Hashtable holding classes from the shared archive.
duke@0 571 static Dictionary* _shared_dictionary;
duke@0 572
duke@0 573 // Monotonically increasing counter which grows with
duke@0 574 // _number_of_classes as well as hot-swapping and breakpoint setting
duke@0 575 // and removal.
duke@0 576 static int _number_of_modifications;
duke@0 577
duke@0 578 // Lock object for system class loader
duke@0 579 static oop _system_loader_lock_obj;
duke@0 580
duke@0 581 // Constraints on class loaders
duke@0 582 static LoaderConstraintTable* _loader_constraints;
duke@0 583
duke@0 584 // Resolution errors
duke@0 585 static ResolutionErrorTable* _resolution_errors;
duke@0 586
jrose@710 587 // Invoke methods (JSR 292)
jrose@710 588 static SymbolPropertyTable* _invoke_method_table;
jrose@710 589
duke@0 590 public:
duke@0 591 // for VM_CounterDecay iteration support
duke@0 592 friend class CounterDecay;
coleenp@3602 593 static Klass* try_get_next_class();
duke@0 594
duke@0 595 private:
duke@0 596 static void validate_protection_domain(instanceKlassHandle klass,
duke@0 597 Handle class_loader,
duke@0 598 Handle protection_domain, TRAPS);
duke@0 599
duke@0 600 friend class VM_PopulateDumpSharedSpace;
duke@0 601 friend class TraversePlaceholdersClosure;
duke@0 602 static Dictionary* dictionary() { return _dictionary; }
duke@0 603 static Dictionary* shared_dictionary() { return _shared_dictionary; }
duke@0 604 static PlaceholderTable* placeholders() { return _placeholders; }
duke@0 605 static LoaderConstraintTable* constraints() { return _loader_constraints; }
duke@0 606 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; }
jrose@710 607 static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; }
duke@0 608
duke@0 609 // Basic loading operations
coleenp@3602 610 static Klass* resolve_instance_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
coleenp@3602 611 static Klass* resolve_array_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
coleenp@2062 612 static instanceKlassHandle handle_parallel_super_load(Symbol* class_name, Symbol* supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS);
duke@0 613 // Wait on SystemDictionary_lock; unlocks lockObject before
duke@0 614 // waiting; relocks lockObject with correct recursion count
duke@0 615 // after waiting, but before reentering SystemDictionary_lock
duke@0 616 // to preserve lock order semantics.
duke@0 617 static void double_lock_wait(Handle lockObject, TRAPS);
duke@0 618 static void define_instance_class(instanceKlassHandle k, TRAPS);
coleenp@2062 619 static instanceKlassHandle find_or_define_instance_class(Symbol* class_name,
duke@0 620 Handle class_loader,
duke@0 621 instanceKlassHandle k, TRAPS);
coleenp@2062 622 static instanceKlassHandle load_shared_class(Symbol* class_name,
duke@0 623 Handle class_loader, TRAPS);
duke@0 624 static instanceKlassHandle load_shared_class(instanceKlassHandle ik,
duke@0 625 Handle class_loader, TRAPS);
coleenp@2062 626 static instanceKlassHandle load_instance_class(Symbol* class_name, Handle class_loader, TRAPS);
duke@0 627 static Handle compute_loader_lock_object(Handle class_loader, TRAPS);
duke@0 628 static void check_loader_lock_contention(Handle loader_lock, TRAPS);
acorn@514 629 static bool is_parallelCapable(Handle class_loader);
acorn@1075 630 static bool is_parallelDefine(Handle class_loader);
duke@0 631
coleenp@3602 632 static Klass* find_shared_class(Symbol* class_name);
duke@0 633
duke@0 634 // Setup link to hierarchy
duke@0 635 static void add_to_hierarchy(instanceKlassHandle k, TRAPS);
duke@0 636
duke@0 637 private:
duke@0 638 // We pass in the hashtable index so we can calculate it outside of
duke@0 639 // the SystemDictionary_lock.
duke@0 640
duke@0 641 // Basic find on loaded classes
coleenp@3602 642 static Klass* find_class(int index, unsigned int hash,
coleenp@3602 643 Symbol* name, ClassLoaderData* loader_data);
coleenp@3602 644 static Klass* find_class(Symbol* class_name, ClassLoaderData* loader_data);
duke@0 645
duke@0 646 // Basic find on classes in the midst of being loaded
coleenp@3602 647 static Symbol* find_placeholder(Symbol* name, ClassLoaderData* loader_data);
duke@0 648
duke@0 649 // Updating entry in dictionary
duke@0 650 // Add a completely loaded class
coleenp@2062 651 static void add_klass(int index, Symbol* class_name,
coleenp@3602 652 ClassLoaderData* loader_data, KlassHandle obj);
duke@0 653
duke@0 654 // Add a placeholder for a class being loaded
duke@0 655 static void add_placeholder(int index,
coleenp@2062 656 Symbol* class_name,
coleenp@3602 657 ClassLoaderData* loader_data);
duke@0 658 static void remove_placeholder(int index,
coleenp@2062 659 Symbol* class_name,
coleenp@3602 660 ClassLoaderData* loader_data);
duke@0 661
duke@0 662 // Performs cleanups after resolve_super_or_fail. This typically needs
duke@0 663 // to be called on failure.
duke@0 664 // Won't throw, but can block.
coleenp@2062 665 static void resolution_cleanups(Symbol* class_name,
coleenp@3602 666 ClassLoaderData* loader_data,
duke@0 667 TRAPS);
duke@0 668
duke@0 669 // Initialization
duke@0 670 static void initialize_preloaded_classes(TRAPS);
duke@0 671
duke@0 672 // Class loader constraints
duke@0 673 static void check_constraints(int index, unsigned int hash,
duke@0 674 instanceKlassHandle k, Handle loader,
duke@0 675 bool defining, TRAPS);
duke@0 676 static void update_dictionary(int d_index, unsigned int d_hash,
duke@0 677 int p_index, unsigned int p_hash,
coleenp@3602 678 instanceKlassHandle k, Handle loader,
coleenp@3602 679 TRAPS);
duke@0 680
duke@0 681 // Variables holding commonly used klasses (preloaded)
coleenp@3602 682 static Klass* _well_known_klasses[];
duke@0 683
duke@0 684 // Lazily loaded klasses
coleenp@3602 685 static Klass* volatile _abstract_ownable_synchronizer_klass;
duke@0 686
jrose@132 687 // table of box klasses (int_klass, etc.)
coleenp@3602 688 static Klass* _box_klasses[T_VOID+1];
duke@0 689
duke@0 690 static oop _java_system_loader;
duke@0 691
duke@0 692 static bool _has_loadClassInternal;
duke@0 693 static bool _has_checkPackageAccess;
duke@0 694 };
jrose@665 695
stefank@1879 696 #endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP