annotate src/share/vm/classfile/systemDictionary.hpp @ 3465:d2a62e0f25eb

6995781: Native Memory Tracking (Phase 1) 7151532: DCmd for hotspot native memory tracking Summary: Implementation of native memory tracking phase 1, which tracks VM native memory usage, and related DCmd Reviewed-by: acorn, coleenp, fparain
author zgu
date Thu, 28 Jun 2012 17:03:16 -0400
parents 8b0a4867acf0
children 1d7922586cf6
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@2062 39 // [class name,class loader] -> class i.e. [Symbol*,oop] -> klassOop
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@2615 151 template(AdapterMethodHandle_klass, java_lang_invoke_AdapterMethodHandle, Pre_JSR292) \
twisti@2615 152 template(BoundMethodHandle_klass, java_lang_invoke_BoundMethodHandle, Pre_JSR292) \
twisti@2615 153 template(DirectMethodHandle_klass, java_lang_invoke_DirectMethodHandle, Pre_JSR292) \
twisti@2615 154 template(MethodType_klass, java_lang_invoke_MethodType, Pre_JSR292) \
twisti@2615 155 template(MethodTypeForm_klass, java_lang_invoke_MethodTypeForm, Pre_JSR292) \
twisti@2615 156 template(BootstrapMethodError_klass, java_lang_BootstrapMethodError, Pre_JSR292) \
jrose@2204 157 template(WrongMethodTypeException_klass, java_lang_invoke_WrongMethodTypeException, Pre_JSR292) \
twisti@2615 158 template(CallSite_klass, java_lang_invoke_CallSite, Pre_JSR292) \
never@2670 159 template(CountingMethodHandle_klass, java_lang_invoke_CountingMethodHandle, Opt) \
twisti@2615 160 template(ConstantCallSite_klass, java_lang_invoke_ConstantCallSite, Pre_JSR292) \
twisti@2615 161 template(MutableCallSite_klass, java_lang_invoke_MutableCallSite, Pre_JSR292) \
twisti@2615 162 template(VolatileCallSite_klass, java_lang_invoke_VolatileCallSite, Pre_JSR292) \
twisti@2615 163 /* Note: MethodHandle must be first, and VolatileCallSite last in group */ \
jrose@726 164 \
never@1142 165 template(StringBuffer_klass, java_lang_StringBuffer, Pre) \
never@1080 166 template(StringBuilder_klass, java_lang_StringBuilder, Pre) \
jrose@132 167 \
jrose@132 168 /* It's NULL in non-1.4 JDKs. */ \
never@1142 169 template(StackTraceElement_klass, java_lang_StackTraceElement, Opt) \
jrose@132 170 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
jrose@132 171 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
never@2702 172 template(nio_Buffer_klass, java_nio_Buffer, Opt) \
jrose@132 173 \
never@2702 174 template(DownloadManager_klass, sun_jkernel_DownloadManager, Opt_Kernel) \
jrose@132 175 \
never@2702 176 template(PostVMInitHook_klass, sun_misc_PostVMInitHook, Opt) \
kevinw@2014 177 \
jrose@132 178 /* Preload boxing klasses */ \
never@1142 179 template(Boolean_klass, java_lang_Boolean, Pre) \
never@1142 180 template(Character_klass, java_lang_Character, Pre) \
never@1142 181 template(Float_klass, java_lang_Float, Pre) \
never@1142 182 template(Double_klass, java_lang_Double, Pre) \
never@1142 183 template(Byte_klass, java_lang_Byte, Pre) \
never@1142 184 template(Short_klass, java_lang_Short, Pre) \
never@1142 185 template(Integer_klass, java_lang_Integer, Pre) \
never@1142 186 template(Long_klass, java_lang_Long, Pre) \
jrose@132 187 /*end*/
jrose@132 188
jrose@132 189
duke@0 190 class SystemDictionary : AllStatic {
duke@0 191 friend class VMStructs;
duke@0 192 friend class CompactingPermGenGen;
jrose@665 193 friend class SystemDictionaryHandles;
duke@0 194 NOT_PRODUCT(friend class instanceKlassKlass;)
duke@0 195
duke@0 196 public:
jrose@132 197 enum WKID {
jrose@132 198 NO_WKID = 0,
jrose@132 199
never@2702 200 #define WK_KLASS_ENUM(name, symbol, ignore_o) WK_KLASS_ENUM_NAME(name), WK_KLASS_ENUM_NAME(symbol) = WK_KLASS_ENUM_NAME(name),
jrose@132 201 WK_KLASSES_DO(WK_KLASS_ENUM)
jrose@132 202 #undef WK_KLASS_ENUM
jrose@132 203
jrose@132 204 WKID_LIMIT,
jrose@132 205
jrose@132 206 FIRST_WKID = NO_WKID + 1
jrose@132 207 };
jrose@132 208
jrose@132 209 enum InitOption {
jrose@132 210 Pre, // preloaded; error if not present
twisti@2263 211 Pre_JSR292, // preloaded if EnableInvokeDynamic
jrose@132 212
jrose@132 213 // Order is significant. Options before this point require resolve_or_fail.
jrose@132 214 // Options after this point will use resolve_or_null instead.
jrose@132 215
jrose@132 216 Opt, // preload tried; NULL if not present
jrose@132 217 Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection
jrose@132 218 Opt_Only_JDK15, // preload tried; use only with JDK1.5+
jrose@132 219 Opt_Kernel, // preload tried only #ifdef KERNEL
jrose@132 220 OPTION_LIMIT,
jrose@132 221 CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT)
jrose@132 222 };
jrose@132 223
jrose@132 224
duke@0 225 // Returns a class with a given class name and class loader. Loads the
duke@0 226 // class if needed. If not found a NoClassDefFoundError or a
duke@0 227 // ClassNotFoundException is thrown, depending on the value on the
duke@0 228 // throw_error flag. For most uses the throw_error argument should be set
duke@0 229 // to true.
duke@0 230
coleenp@2062 231 static klassOop resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS);
duke@0 232 // Convenient call for null loader and protection domain.
coleenp@2062 233 static klassOop resolve_or_fail(Symbol* class_name, bool throw_error, TRAPS);
duke@0 234 private:
duke@0 235 // handle error translation for resolve_or_null results
coleenp@2062 236 static klassOop handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS);
duke@0 237
duke@0 238 public:
duke@0 239
duke@0 240 // Returns a class with a given class name and class loader.
duke@0 241 // Loads the class if needed. If not found NULL is returned.
coleenp@2062 242 static klassOop resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
duke@0 243 // Version with null loader and protection domain
coleenp@2062 244 static klassOop resolve_or_null(Symbol* class_name, TRAPS);
duke@0 245
duke@0 246 // Resolve a superclass or superinterface. Called from ClassFileParser,
duke@0 247 // parse_interfaces, resolve_instance_class_or_null, load_shared_class
duke@0 248 // "child_name" is the class whose super class or interface is being resolved.
coleenp@2062 249 static klassOop resolve_super_or_fail(Symbol* child_name,
coleenp@2062 250 Symbol* class_name,
duke@0 251 Handle class_loader,
duke@0 252 Handle protection_domain,
duke@0 253 bool is_superclass,
duke@0 254 TRAPS);
duke@0 255
duke@0 256 // Parse new stream. This won't update the system dictionary or
duke@0 257 // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses.
coleenp@2062 258 static klassOop parse_stream(Symbol* class_name,
duke@0 259 Handle class_loader,
duke@0 260 Handle protection_domain,
duke@0 261 ClassFileStream* st,
jrose@431 262 TRAPS) {
jrose@431 263 KlassHandle nullHandle;
jrose@431 264 return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD);
jrose@431 265 }
coleenp@2062 266 static klassOop parse_stream(Symbol* class_name,
jrose@431 267 Handle class_loader,
jrose@431 268 Handle protection_domain,
jrose@431 269 ClassFileStream* st,
jrose@431 270 KlassHandle host_klass,
jrose@431 271 GrowableArray<Handle>* cp_patches,
duke@0 272 TRAPS);
duke@0 273
duke@0 274 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass)
coleenp@2062 275 static klassOop resolve_from_stream(Symbol* class_name, Handle class_loader,
acorn@973 276 Handle protection_domain,
acorn@973 277 ClassFileStream* st, bool verify, TRAPS);
duke@0 278
duke@0 279 // Lookup an already loaded class. If not found NULL is returned.
coleenp@2062 280 static klassOop find(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
duke@0 281
duke@0 282 // Lookup an already loaded instance or array class.
duke@0 283 // Do not make any queries to class loaders; consult only the cache.
duke@0 284 // If not found NULL is returned.
coleenp@2062 285 static klassOop find_instance_or_array_klass(Symbol* class_name,
duke@0 286 Handle class_loader,
duke@0 287 Handle protection_domain,
duke@0 288 TRAPS);
duke@0 289
jrose@132 290 // If the given name is known to vmSymbols, return the well-know klass:
coleenp@2062 291 static klassOop find_well_known_klass(Symbol* class_name);
jrose@132 292
duke@0 293 // Lookup an instance or array class that has already been loaded
duke@0 294 // either into the given class loader, or else into another class
duke@0 295 // loader that is constrained (via loader constraints) to produce
duke@0 296 // a consistent class. Do not take protection domains into account.
duke@0 297 // Do not make any queries to class loaders; consult only the cache.
duke@0 298 // Return NULL if the class is not found.
duke@0 299 //
duke@0 300 // This function is a strict superset of find_instance_or_array_klass.
duke@0 301 // This function (the unchecked version) makes a conservative prediction
duke@0 302 // of the result of the checked version, assuming successful lookup.
duke@0 303 // If both functions return non-null, they must return the same value.
duke@0 304 // Also, the unchecked version may sometimes be non-null where the
duke@0 305 // checked version is null. This can occur in several ways:
duke@0 306 // 1. No query has yet been made to the class loader.
duke@0 307 // 2. The class loader was queried, but chose not to delegate.
duke@0 308 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain.
duke@0 309 // 4. Loading was attempted, but there was a linkage error of some sort.
duke@0 310 // In all of these cases, the loader constraints on this type are
duke@0 311 // satisfied, and it is safe for classes in the given class loader
duke@0 312 // to manipulate strongly-typed values of the found class, subject
duke@0 313 // to local linkage and access checks.
coleenp@2062 314 static klassOop find_constrained_instance_or_array_klass(Symbol* class_name,
duke@0 315 Handle class_loader,
duke@0 316 TRAPS);
duke@0 317
duke@0 318 // Iterate over all klasses in dictionary
duke@0 319 // Just the classes from defining class loaders
duke@0 320 static void classes_do(void f(klassOop));
duke@0 321 // Added for initialize_itable_for_klass to handle exceptions
duke@0 322 static void classes_do(void f(klassOop, TRAPS), TRAPS);
duke@0 323 // All classes, and their class loaders
duke@0 324 static void classes_do(void f(klassOop, oop));
duke@0 325 // All classes, and their class loaders
duke@0 326 // (added for helpers that use HandleMarks and ResourceMarks)
duke@0 327 static void classes_do(void f(klassOop, oop, TRAPS), TRAPS);
duke@0 328 // All entries in the placeholder table and their class loaders
coleenp@2062 329 static void placeholders_do(void f(Symbol*, oop));
duke@0 330
duke@0 331 // Iterate over all methods in all klasses in dictionary
duke@0 332 static void methods_do(void f(methodOop));
duke@0 333
duke@0 334 // Garbage collection support
duke@0 335
duke@0 336 // This method applies "blk->do_oop" to all the pointers to "system"
duke@0 337 // classes and loaders.
duke@0 338 static void always_strong_oops_do(OopClosure* blk);
duke@0 339 static void always_strong_classes_do(OopClosure* blk);
duke@0 340 // This method applies "blk->do_oop" to all the placeholders.
duke@0 341 static void placeholders_do(OopClosure* blk);
duke@0 342
duke@0 343 // Unload (that is, break root links to) all unmarked classes and
duke@0 344 // loaders. Returns "true" iff something was unloaded.
duke@0 345 static bool do_unloading(BoolObjectClosure* is_alive);
duke@0 346
acorn@3056 347 static int calculate_systemdictionary_size(int loadedclasses);
acorn@3056 348
duke@0 349 // Applies "f->do_oop" to all root oops in the system dictionary.
duke@0 350 static void oops_do(OopClosure* f);
duke@0 351
duke@0 352 // System loader lock
duke@0 353 static oop system_loader_lock() { return _system_loader_lock_obj; }
duke@0 354
duke@0 355 private:
duke@0 356 // Traverses preloaded oops: various system classes. These are
duke@0 357 // guaranteed to be in the perm gen.
duke@0 358 static void preloaded_oops_do(OopClosure* f);
duke@0 359 static void lazily_loaded_oops_do(OopClosure* f);
duke@0 360
duke@0 361 public:
duke@0 362 // Sharing support.
duke@0 363 static void reorder_dictionary();
duke@0 364 static void copy_buckets(char** top, char* end);
duke@0 365 static void copy_table(char** top, char* end);
duke@0 366 static void reverse();
zgu@3465 367 static void set_shared_dictionary(HashtableBucket<mtClass>* t, int length,
duke@0 368 int number_of_entries);
duke@0 369 // Printing
duke@0 370 static void print() PRODUCT_RETURN;
duke@0 371 static void print_class_statistics() PRODUCT_RETURN;
duke@0 372 static void print_method_statistics() PRODUCT_RETURN;
duke@0 373
duke@0 374 // Number of contained klasses
duke@0 375 // This is both fully loaded classes and classes in the process
duke@0 376 // of being loaded
duke@0 377 static int number_of_classes();
duke@0 378
duke@0 379 // Monotonically increasing counter which grows as classes are
duke@0 380 // loaded or modifications such as hot-swapping or setting/removing
duke@0 381 // of breakpoints are performed
duke@0 382 static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; }
duke@0 383 // Needed by evolution and breakpoint code
duke@0 384 static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; }
duke@0 385
duke@0 386 // Verification
duke@0 387 static void verify();
duke@0 388
duke@0 389 #ifdef ASSERT
coleenp@2062 390 static bool is_internal_format(Symbol* class_name);
duke@0 391 #endif
duke@0 392
duke@0 393 // Verify class is in dictionary
duke@0 394 static void verify_obj_klass_present(Handle obj,
coleenp@2062 395 Symbol* class_name,
duke@0 396 Handle class_loader);
duke@0 397
duke@0 398 // Initialization
duke@0 399 static void initialize(TRAPS);
duke@0 400
duke@0 401 // Fast access to commonly used classes (preloaded)
duke@0 402 static klassOop check_klass(klassOop k) {
duke@0 403 assert(k != NULL, "preloaded klass not initialized");
duke@0 404 return k;
duke@0 405 }
duke@0 406
jrose@132 407 static klassOop check_klass_Pre(klassOop k) { return check_klass(k); }
jrose@2203 408 static klassOop check_klass_Pre_JSR292(klassOop k) { return EnableInvokeDynamic ? check_klass(k) : k; }
jrose@132 409 static klassOop check_klass_Opt(klassOop k) { return k; }
jrose@132 410 static klassOop check_klass_Opt_Kernel(klassOop k) { return k; } //== Opt
jrose@132 411 static klassOop check_klass_Opt_Only_JDK15(klassOop k) {
jrose@132 412 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only");
jrose@132 413 return k;
jrose@132 414 }
jrose@132 415 static klassOop check_klass_Opt_Only_JDK14NewRef(klassOop k) {
duke@0 416 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only");
jrose@132 417 // despite the optional loading, if you use this it must be present:
jrose@132 418 return check_klass(k);
duke@0 419 }
duke@0 420
jrose@132 421 static bool initialize_wk_klass(WKID id, int init_opt, TRAPS);
jrose@132 422 static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS);
jrose@132 423 static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) {
jrose@132 424 int limit = (int)end_id + 1;
jrose@132 425 initialize_wk_klasses_until((WKID) limit, start_id, THREAD);
jrose@132 426 }
duke@0 427
jrose@132 428 public:
never@2702 429 #define WK_KLASS_DECLARE(name, symbol, option) \
jrose@132 430 static klassOop name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); }
jrose@132 431 WK_KLASSES_DO(WK_KLASS_DECLARE);
jrose@132 432 #undef WK_KLASS_DECLARE
duke@0 433
never@2702 434 static klassOop well_known_klass(WKID id) {
never@2702 435 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob");
never@2702 436 return _well_known_klasses[id];
never@2702 437 }
never@2702 438
jrose@132 439 // Local definition for direct access to the private array:
jrose@147 440 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]
duke@0 441
duke@0 442 static klassOop box_klass(BasicType t) {
duke@0 443 assert((uint)t < T_VOID+1, "range check");
duke@0 444 return check_klass(_box_klasses[t]);
duke@0 445 }
duke@0 446 static BasicType box_klass_type(klassOop k); // inverse of box_klass
duke@0 447
duke@0 448 // methods returning lazily loaded klasses
duke@0 449 // The corresponding method to load the class must be called before calling them.
duke@0 450 static klassOop abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); }
duke@0 451
duke@0 452 static void load_abstract_ownable_synchronizer_klass(TRAPS);
duke@0 453
duke@0 454 private:
duke@0 455 // Tells whether ClassLoader.loadClassInternal is present
duke@0 456 static bool has_loadClassInternal() { return _has_loadClassInternal; }
duke@0 457
duke@0 458 public:
duke@0 459 // Tells whether ClassLoader.checkPackageAccess is present
duke@0 460 static bool has_checkPackageAccess() { return _has_checkPackageAccess; }
duke@0 461
never@1142 462 static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; }
never@1142 463 static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; }
duke@0 464
duke@0 465 // Returns default system loader
duke@0 466 static oop java_system_loader();
duke@0 467
duke@0 468 // Compute the default system loader
duke@0 469 static void compute_java_system_loader(TRAPS);
duke@0 470
duke@0 471 private:
duke@0 472 // Mirrors for primitive classes (created eagerly)
duke@0 473 static oop check_mirror(oop m) {
duke@0 474 assert(m != NULL, "mirror not initialized");
duke@0 475 return m;
duke@0 476 }
duke@0 477
duke@0 478 public:
duke@0 479 // Note: java_lang_Class::primitive_type is the inverse of java_mirror
duke@0 480
duke@0 481 // Check class loader constraints
coleenp@2062 482 static bool add_loader_constraint(Symbol* name, Handle loader1,
duke@0 483 Handle loader2, TRAPS);
coleenp@2062 484 static char* check_signature_loaders(Symbol* signature, Handle loader1,
duke@0 485 Handle loader2, bool is_method, TRAPS);
duke@0 486
jrose@710 487 // JSR 292
jrose@2204 488 // find the java.lang.invoke.MethodHandles::invoke method for a given signature
coleenp@2062 489 static methodOop find_method_handle_invoke(Symbol* name,
coleenp@2062 490 Symbol* signature,
jrose@1428 491 KlassHandle accessing_klass,
jrose@710 492 TRAPS);
jrose@2204 493 // ask Java to compute a java.lang.invoke.MethodType object for a given signature
coleenp@2062 494 static Handle find_method_handle_type(Symbol* signature,
jrose@1428 495 KlassHandle accessing_klass,
jrose@1713 496 bool for_invokeGeneric,
jrose@1428 497 bool& return_bcp_flag,
jrose@1427 498 TRAPS);
jrose@2204 499 // ask Java to compute a java.lang.invoke.MethodHandle object for a given CP entry
jrose@1522 500 static Handle link_method_handle_constant(KlassHandle caller,
jrose@1522 501 int ref_kind, //e.g., JVM_REF_invokeVirtual
jrose@1522 502 KlassHandle callee,
coleenp@2062 503 Symbol* name,
coleenp@2062 504 Symbol* signature,
jrose@1522 505 TRAPS);
jrose@726 506 // ask Java to create a dynamic call site, while linking an invokedynamic op
jrose@1427 507 static Handle make_dynamic_call_site(Handle bootstrap_method,
jrose@1427 508 // Callee information:
coleenp@2062 509 Symbol* name,
jrose@1427 510 methodHandle signature_invoker,
jrose@1427 511 Handle info,
jrose@1427 512 // Caller information:
jrose@1427 513 methodHandle caller_method,
jrose@726 514 int caller_bci,
jrose@726 515 TRAPS);
jrose@726 516
jrose@726 517 // coordinate with Java about bootstrap methods
jrose@1580 518 static Handle find_bootstrap_method(methodHandle caller_method,
jrose@1580 519 int caller_bci, // N.B. must be an invokedynamic
jrose@1580 520 int cache_index, // must be corresponding main_entry
jrose@1833 521 Handle &argument_info_result, // static BSM arguments, if any
jrose@1580 522 TRAPS);
jrose@726 523
duke@0 524 // Utility for printing loader "name" as part of tracing constraints
duke@0 525 static const char* loader_name(oop loader) {
duke@0 526 return ((loader) == NULL ? "<bootloader>" :
duke@0 527 instanceKlass::cast((loader)->klass())->name()->as_C_string() );
duke@0 528 }
duke@0 529
duke@0 530 // Record the error when the first attempt to resolve a reference from a constant
duke@0 531 // pool entry to a class fails.
coleenp@2062 532 static void add_resolution_error(constantPoolHandle pool, int which, Symbol* error);
coleenp@2062 533 static Symbol* find_resolution_error(constantPoolHandle pool, int which);
duke@0 534
duke@0 535 private:
duke@0 536
duke@0 537 enum Constants {
duke@0 538 _loader_constraint_size = 107, // number of entries in constraint table
duke@0 539 _resolution_error_size = 107, // number of entries in resolution error table
jrose@710 540 _invoke_method_size = 139, // number of entries in invoke method table
acorn@3056 541 _nof_buckets = 1009, // number of buckets in hash table for placeholders
acorn@3056 542 _old_default_sdsize = 1009, // backward compat for system dictionary size
acorn@3056 543 _prime_array_size = 8, // array of primes for system dictionary size
acorn@3056 544 _average_depth_goal = 3 // goal for lookup length
duke@0 545 };
duke@0 546
duke@0 547
duke@0 548 // Static variables
duke@0 549
acorn@3056 550 // hashtable sizes for system dictionary to allow growth
acorn@3056 551 // prime numbers for system dictionary size
acorn@3056 552 static int _sdgeneration;
acorn@3056 553 static const int _primelist[_prime_array_size];
acorn@3056 554
duke@0 555 // Hashtable holding loaded classes.
duke@0 556 static Dictionary* _dictionary;
duke@0 557
duke@0 558 // Hashtable holding placeholders for classes being loaded.
duke@0 559 static PlaceholderTable* _placeholders;
duke@0 560
duke@0 561 // Hashtable holding classes from the shared archive.
duke@0 562 static Dictionary* _shared_dictionary;
duke@0 563
duke@0 564 // Monotonically increasing counter which grows with
duke@0 565 // _number_of_classes as well as hot-swapping and breakpoint setting
duke@0 566 // and removal.
duke@0 567 static int _number_of_modifications;
duke@0 568
duke@0 569 // Lock object for system class loader
duke@0 570 static oop _system_loader_lock_obj;
duke@0 571
duke@0 572 // Constraints on class loaders
duke@0 573 static LoaderConstraintTable* _loader_constraints;
duke@0 574
duke@0 575 // Resolution errors
duke@0 576 static ResolutionErrorTable* _resolution_errors;
duke@0 577
jrose@710 578 // Invoke methods (JSR 292)
jrose@710 579 static SymbolPropertyTable* _invoke_method_table;
jrose@710 580
duke@0 581 public:
duke@0 582 // for VM_CounterDecay iteration support
duke@0 583 friend class CounterDecay;
duke@0 584 static klassOop try_get_next_class();
duke@0 585
duke@0 586 private:
duke@0 587 static void validate_protection_domain(instanceKlassHandle klass,
duke@0 588 Handle class_loader,
duke@0 589 Handle protection_domain, TRAPS);
duke@0 590
duke@0 591 friend class VM_PopulateDumpSharedSpace;
duke@0 592 friend class TraversePlaceholdersClosure;
duke@0 593 static Dictionary* dictionary() { return _dictionary; }
duke@0 594 static Dictionary* shared_dictionary() { return _shared_dictionary; }
duke@0 595 static PlaceholderTable* placeholders() { return _placeholders; }
duke@0 596 static LoaderConstraintTable* constraints() { return _loader_constraints; }
duke@0 597 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; }
jrose@710 598 static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; }
duke@0 599
duke@0 600 // Basic loading operations
coleenp@2062 601 static klassOop resolve_instance_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
coleenp@2062 602 static klassOop resolve_array_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
coleenp@2062 603 static instanceKlassHandle handle_parallel_super_load(Symbol* class_name, Symbol* supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS);
duke@0 604 // Wait on SystemDictionary_lock; unlocks lockObject before
duke@0 605 // waiting; relocks lockObject with correct recursion count
duke@0 606 // after waiting, but before reentering SystemDictionary_lock
duke@0 607 // to preserve lock order semantics.
duke@0 608 static void double_lock_wait(Handle lockObject, TRAPS);
duke@0 609 static void define_instance_class(instanceKlassHandle k, TRAPS);
coleenp@2062 610 static instanceKlassHandle find_or_define_instance_class(Symbol* class_name,
duke@0 611 Handle class_loader,
duke@0 612 instanceKlassHandle k, TRAPS);
coleenp@2062 613 static instanceKlassHandle load_shared_class(Symbol* class_name,
duke@0 614 Handle class_loader, TRAPS);
duke@0 615 static instanceKlassHandle load_shared_class(instanceKlassHandle ik,
duke@0 616 Handle class_loader, TRAPS);
coleenp@2062 617 static instanceKlassHandle load_instance_class(Symbol* class_name, Handle class_loader, TRAPS);
duke@0 618 static Handle compute_loader_lock_object(Handle class_loader, TRAPS);
duke@0 619 static void check_loader_lock_contention(Handle loader_lock, TRAPS);
acorn@514 620 static bool is_parallelCapable(Handle class_loader);
acorn@1075 621 static bool is_parallelDefine(Handle class_loader);
duke@0 622
coleenp@2062 623 static klassOop find_shared_class(Symbol* class_name);
duke@0 624
duke@0 625 // Setup link to hierarchy
duke@0 626 static void add_to_hierarchy(instanceKlassHandle k, TRAPS);
duke@0 627
duke@0 628 private:
duke@0 629 // We pass in the hashtable index so we can calculate it outside of
duke@0 630 // the SystemDictionary_lock.
duke@0 631
duke@0 632 // Basic find on loaded classes
duke@0 633 static klassOop find_class(int index, unsigned int hash,
coleenp@2062 634 Symbol* name, Handle loader);
coleenp@2062 635 static klassOop find_class(Symbol* class_name, Handle class_loader);
duke@0 636
duke@0 637 // Basic find on classes in the midst of being loaded
coleenp@2062 638 static Symbol* find_placeholder(Symbol* name, Handle loader);
duke@0 639
duke@0 640 // Updating entry in dictionary
duke@0 641 // Add a completely loaded class
coleenp@2062 642 static void add_klass(int index, Symbol* class_name,
duke@0 643 Handle class_loader, KlassHandle obj);
duke@0 644
duke@0 645 // Add a placeholder for a class being loaded
duke@0 646 static void add_placeholder(int index,
coleenp@2062 647 Symbol* class_name,
duke@0 648 Handle class_loader);
duke@0 649 static void remove_placeholder(int index,
coleenp@2062 650 Symbol* class_name,
duke@0 651 Handle class_loader);
duke@0 652
duke@0 653 // Performs cleanups after resolve_super_or_fail. This typically needs
duke@0 654 // to be called on failure.
duke@0 655 // Won't throw, but can block.
coleenp@2062 656 static void resolution_cleanups(Symbol* class_name,
duke@0 657 Handle class_loader,
duke@0 658 TRAPS);
duke@0 659
duke@0 660 // Initialization
duke@0 661 static void initialize_preloaded_classes(TRAPS);
duke@0 662
duke@0 663 // Class loader constraints
duke@0 664 static void check_constraints(int index, unsigned int hash,
duke@0 665 instanceKlassHandle k, Handle loader,
duke@0 666 bool defining, TRAPS);
duke@0 667 static void update_dictionary(int d_index, unsigned int d_hash,
duke@0 668 int p_index, unsigned int p_hash,
duke@0 669 instanceKlassHandle k, Handle loader, TRAPS);
duke@0 670
duke@0 671 // Variables holding commonly used klasses (preloaded)
jrose@132 672 static klassOop _well_known_klasses[];
duke@0 673
duke@0 674 // Lazily loaded klasses
duke@0 675 static volatile klassOop _abstract_ownable_synchronizer_klass;
duke@0 676
jrose@132 677 // table of box klasses (int_klass, etc.)
duke@0 678 static klassOop _box_klasses[T_VOID+1];
duke@0 679
duke@0 680 static oop _java_system_loader;
duke@0 681
duke@0 682 static bool _has_loadClassInternal;
duke@0 683 static bool _has_checkPackageAccess;
duke@0 684 };
jrose@665 685
jrose@665 686 class SystemDictionaryHandles : AllStatic {
jrose@665 687 public:
jrose@665 688 #define WK_KLASS_HANDLE_DECLARE(name, ignore_symbol, option) \
jrose@665 689 static KlassHandle name() { \
jrose@665 690 SystemDictionary::name(); \
jrose@665 691 klassOop* loc = &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \
jrose@665 692 return KlassHandle(loc, true); \
jrose@665 693 }
jrose@665 694 WK_KLASSES_DO(WK_KLASS_HANDLE_DECLARE);
jrose@665 695 #undef WK_KLASS_HANDLE_DECLARE
jrose@665 696
jrose@665 697 static KlassHandle box_klass(BasicType t);
jrose@665 698 };
stefank@1879 699
stefank@1879 700 #endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP