annotate src/share/vm/classfile/systemDictionary.hpp @ 2062:3582bf76420e

6990754: Use native memory and reference counting to implement SymbolTable Summary: move symbols from permgen into C heap and reference count them Reviewed-by: never, acorn, jmasa, stefank
author coleenp
date Thu, 27 Jan 2011 16:11:27 -0800
parents 8f8dfba37802
children 72dee110246f
rev   line source
duke@0 1 /*
kevinw@2014 2 * Copyright (c) 1997, 2011, 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"
stefank@1879 35
duke@0 36 // The system dictionary stores all loaded classes and maps:
duke@0 37 //
coleenp@2062 38 // [class name,class loader] -> class i.e. [Symbol*,oop] -> klassOop
duke@0 39 //
duke@0 40 // Classes are loaded lazily. The default VM class loader is
duke@0 41 // represented as NULL.
duke@0 42
duke@0 43 // The underlying data structure is an open hash table with a fixed number
duke@0 44 // of buckets. During loading the loader object is locked, (for the VM loader
duke@0 45 // a private lock object is used). Class loading can thus be done concurrently,
duke@0 46 // but only by different loaders.
duke@0 47 //
duke@0 48 // During loading a placeholder (name, loader) is temporarily placed in
duke@0 49 // a side data structure, and is used to detect ClassCircularityErrors
duke@0 50 // and to perform verification during GC. A GC can occur in the midst
duke@0 51 // of class loading, as we call out to Java, have to take locks, etc.
duke@0 52 //
duke@0 53 // When class loading is finished, a new entry is added to the system
duke@0 54 // dictionary and the place holder is removed. Note that the protection
duke@0 55 // domain field of the system dictionary has not yet been filled in when
duke@0 56 // the "real" system dictionary entry is created.
duke@0 57 //
duke@0 58 // Clients of this class who are interested in finding if a class has
duke@0 59 // been completely loaded -- not classes in the process of being loaded --
duke@0 60 // can read the SystemDictionary unlocked. This is safe because
duke@0 61 // - entries are only deleted at safepoints
duke@0 62 // - readers cannot come to a safepoint while actively examining
duke@0 63 // an entry (an entry cannot be deleted from under a reader)
duke@0 64 // - entries must be fully formed before they are available to concurrent
duke@0 65 // readers (we must ensure write ordering)
duke@0 66 //
duke@0 67 // Note that placeholders are deleted at any time, as they are removed
duke@0 68 // when a class is completely loaded. Therefore, readers as well as writers
duke@0 69 // of placeholders must hold the SystemDictionary_lock.
duke@0 70 //
duke@0 71
duke@0 72 class Dictionary;
duke@0 73 class PlaceholderTable;
duke@0 74 class LoaderConstraintTable;
duke@0 75 class HashtableBucket;
duke@0 76 class ResolutionErrorTable;
jrose@710 77 class SymbolPropertyTable;
duke@0 78
jrose@132 79 // Certain classes are preloaded, such as java.lang.Object and java.lang.String.
jrose@132 80 // They are all "well-known", in the sense that no class loader is allowed
jrose@132 81 // to provide a different definition.
jrose@132 82 //
jrose@132 83 // These klasses must all have names defined in vmSymbols.
jrose@132 84
jrose@132 85 #define WK_KLASS_ENUM_NAME(kname) kname##_knum
jrose@132 86
jrose@132 87 // Each well-known class has a short klass name (like object_klass),
jrose@132 88 // a vmSymbol name (like java_lang_Object), and a flag word
jrose@132 89 // that makes some minor distinctions, like whether the klass
jrose@132 90 // is preloaded, optional, release-specific, etc.
jrose@132 91 // The order of these definitions is significant; it is the order in which
jrose@132 92 // preloading is actually performed by initialize_preloaded_classes.
jrose@132 93
jrose@132 94 #define WK_KLASSES_DO(template) \
jrose@132 95 /* well-known classes */ \
never@1142 96 template(Object_klass, java_lang_Object, Pre) \
never@1142 97 template(String_klass, java_lang_String, Pre) \
never@1142 98 template(Class_klass, java_lang_Class, Pre) \
never@1142 99 template(Cloneable_klass, java_lang_Cloneable, Pre) \
never@1142 100 template(ClassLoader_klass, java_lang_ClassLoader, Pre) \
never@1142 101 template(Serializable_klass, java_io_Serializable, Pre) \
never@1142 102 template(System_klass, java_lang_System, Pre) \
never@1142 103 template(Throwable_klass, java_lang_Throwable, Pre) \
never@1142 104 template(Error_klass, java_lang_Error, Pre) \
never@1142 105 template(ThreadDeath_klass, java_lang_ThreadDeath, Pre) \
never@1142 106 template(Exception_klass, java_lang_Exception, Pre) \
never@1142 107 template(RuntimeException_klass, java_lang_RuntimeException, Pre) \
never@1142 108 template(ProtectionDomain_klass, java_security_ProtectionDomain, Pre) \
jrose@132 109 template(AccessControlContext_klass, java_security_AccessControlContext, Pre) \
never@1142 110 template(ClassNotFoundException_klass, java_lang_ClassNotFoundException, Pre) \
never@1142 111 template(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre) \
never@1142 112 template(LinkageError_klass, java_lang_LinkageError, Pre) \
jrose@132 113 template(ClassCastException_klass, java_lang_ClassCastException, Pre) \
jrose@132 114 template(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre) \
never@1142 115 template(VirtualMachineError_klass, java_lang_VirtualMachineError, Pre) \
jrose@132 116 template(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre) \
jrose@132 117 template(StackOverflowError_klass, java_lang_StackOverflowError, Pre) \
jrose@132 118 template(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre) \
never@1142 119 template(Reference_klass, java_lang_ref_Reference, Pre) \
jrose@132 120 \
jrose@132 121 /* Preload ref klasses and set reference types */ \
never@1142 122 template(SoftReference_klass, java_lang_ref_SoftReference, Pre) \
never@1142 123 template(WeakReference_klass, java_lang_ref_WeakReference, Pre) \
never@1142 124 template(FinalReference_klass, java_lang_ref_FinalReference, Pre) \
never@1142 125 template(PhantomReference_klass, java_lang_ref_PhantomReference, Pre) \
never@1142 126 template(Finalizer_klass, java_lang_ref_Finalizer, Pre) \
jrose@132 127 \
never@1142 128 template(Thread_klass, java_lang_Thread, Pre) \
never@1142 129 template(ThreadGroup_klass, java_lang_ThreadGroup, Pre) \
never@1142 130 template(Properties_klass, java_util_Properties, Pre) \
never@1142 131 template(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject, Pre) \
never@1142 132 template(reflect_Field_klass, java_lang_reflect_Field, Pre) \
never@1142 133 template(reflect_Method_klass, java_lang_reflect_Method, Pre) \
never@1142 134 template(reflect_Constructor_klass, java_lang_reflect_Constructor, Pre) \
jrose@132 135 \
jrose@132 136 /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \
jrose@132 137 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
jrose@132 138 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
never@1142 139 template(reflect_MagicAccessorImpl_klass, sun_reflect_MagicAccessorImpl, Opt) \
never@1142 140 template(reflect_MethodAccessorImpl_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \
never@1142 141 template(reflect_ConstructorAccessorImpl_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \
never@1142 142 template(reflect_DelegatingClassLoader_klass, sun_reflect_DelegatingClassLoader, Opt) \
never@1142 143 template(reflect_ConstantPool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15) \
never@1142 144 template(reflect_UnsafeStaticFieldAccessorImpl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15) \
jrose@132 145 \
jrose@710 146 /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \
jrose@710 147 template(MethodHandle_klass, java_dyn_MethodHandle, Opt) \
jrose@710 148 template(MemberName_klass, sun_dyn_MemberName, Opt) \
jrose@710 149 template(MethodHandleImpl_klass, sun_dyn_MethodHandleImpl, Opt) \
jrose@1427 150 template(MethodHandleNatives_klass, sun_dyn_MethodHandleNatives, Opt) \
jrose@710 151 template(AdapterMethodHandle_klass, sun_dyn_AdapterMethodHandle, Opt) \
jrose@710 152 template(BoundMethodHandle_klass, sun_dyn_BoundMethodHandle, Opt) \
jrose@710 153 template(DirectMethodHandle_klass, sun_dyn_DirectMethodHandle, Opt) \
jrose@710 154 template(MethodType_klass, java_dyn_MethodType, Opt) \
jrose@710 155 template(MethodTypeForm_klass, java_dyn_MethodTypeForm, Opt) \
jrose@710 156 template(WrongMethodTypeException_klass, java_dyn_WrongMethodTypeException, Opt) \
jrose@726 157 template(Linkage_klass, java_dyn_Linkage, Opt) \
jrose@726 158 template(CallSite_klass, java_dyn_CallSite, Opt) \
twisti@1908 159 /* Note: MethodHandle must be first, and CallSite last in group */ \
jrose@726 160 \
never@1142 161 template(StringBuffer_klass, java_lang_StringBuffer, Pre) \
never@1080 162 template(StringBuilder_klass, java_lang_StringBuilder, Pre) \
jrose@132 163 \
jrose@132 164 /* It's NULL in non-1.4 JDKs. */ \
never@1142 165 template(StackTraceElement_klass, java_lang_StackTraceElement, Opt) \
jrose@132 166 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
jrose@132 167 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
jrose@132 168 template(java_nio_Buffer_klass, java_nio_Buffer, Opt) \
jrose@132 169 \
jrose@132 170 /* If this class isn't present, it won't be referenced. */ \
jrose@132 171 template(sun_misc_AtomicLongCSImpl_klass, sun_misc_AtomicLongCSImpl, Opt) \
jrose@132 172 \
jrose@132 173 template(sun_jkernel_DownloadManager_klass, sun_jkernel_DownloadManager, Opt_Kernel) \
jrose@132 174 \
kevinw@2014 175 template(sun_misc_PostVMInitHook_klass, sun_misc_PostVMInitHook, Opt) \
kevinw@2014 176 \
jrose@132 177 /* Preload boxing klasses */ \
never@1142 178 template(Boolean_klass, java_lang_Boolean, Pre) \
never@1142 179 template(Character_klass, java_lang_Character, Pre) \
never@1142 180 template(Float_klass, java_lang_Float, Pre) \
never@1142 181 template(Double_klass, java_lang_Double, Pre) \
never@1142 182 template(Byte_klass, java_lang_Byte, Pre) \
never@1142 183 template(Short_klass, java_lang_Short, Pre) \
never@1142 184 template(Integer_klass, java_lang_Integer, Pre) \
never@1142 185 template(Long_klass, java_lang_Long, Pre) \
jrose@132 186 /*end*/
jrose@132 187
jrose@132 188
duke@0 189 class SystemDictionary : AllStatic {
duke@0 190 friend class VMStructs;
duke@0 191 friend class CompactingPermGenGen;
jrose@665 192 friend class SystemDictionaryHandles;
duke@0 193 NOT_PRODUCT(friend class instanceKlassKlass;)
duke@0 194
duke@0 195 public:
jrose@132 196 enum WKID {
jrose@132 197 NO_WKID = 0,
jrose@132 198
jrose@132 199 #define WK_KLASS_ENUM(name, ignore_s, ignore_o) WK_KLASS_ENUM_NAME(name),
jrose@132 200 WK_KLASSES_DO(WK_KLASS_ENUM)
jrose@132 201 #undef WK_KLASS_ENUM
jrose@132 202
jrose@132 203 WKID_LIMIT,
jrose@132 204
jrose@132 205 FIRST_WKID = NO_WKID + 1
jrose@132 206 };
jrose@132 207
jrose@132 208 enum InitOption {
jrose@132 209 Pre, // preloaded; error if not present
jrose@132 210
jrose@132 211 // Order is significant. Options before this point require resolve_or_fail.
jrose@132 212 // Options after this point will use resolve_or_null instead.
jrose@132 213
jrose@132 214 Opt, // preload tried; NULL if not present
jrose@132 215 Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection
jrose@132 216 Opt_Only_JDK15, // preload tried; use only with JDK1.5+
jrose@132 217 Opt_Kernel, // preload tried only #ifdef KERNEL
jrose@132 218 OPTION_LIMIT,
jrose@132 219 CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT)
jrose@132 220 };
jrose@132 221
jrose@132 222
duke@0 223 // Returns a class with a given class name and class loader. Loads the
duke@0 224 // class if needed. If not found a NoClassDefFoundError or a
duke@0 225 // ClassNotFoundException is thrown, depending on the value on the
duke@0 226 // throw_error flag. For most uses the throw_error argument should be set
duke@0 227 // to true.
duke@0 228
coleenp@2062 229 static klassOop resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS);
duke@0 230 // Convenient call for null loader and protection domain.
coleenp@2062 231 static klassOop resolve_or_fail(Symbol* class_name, bool throw_error, TRAPS);
duke@0 232 private:
duke@0 233 // handle error translation for resolve_or_null results
coleenp@2062 234 static klassOop handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS);
duke@0 235
duke@0 236 public:
duke@0 237
duke@0 238 // Returns a class with a given class name and class loader.
duke@0 239 // Loads the class if needed. If not found NULL is returned.
coleenp@2062 240 static klassOop resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
duke@0 241 // Version with null loader and protection domain
coleenp@2062 242 static klassOop resolve_or_null(Symbol* class_name, TRAPS);
duke@0 243
duke@0 244 // Resolve a superclass or superinterface. Called from ClassFileParser,
duke@0 245 // parse_interfaces, resolve_instance_class_or_null, load_shared_class
duke@0 246 // "child_name" is the class whose super class or interface is being resolved.
coleenp@2062 247 static klassOop resolve_super_or_fail(Symbol* child_name,
coleenp@2062 248 Symbol* class_name,
duke@0 249 Handle class_loader,
duke@0 250 Handle protection_domain,
duke@0 251 bool is_superclass,
duke@0 252 TRAPS);
duke@0 253
duke@0 254 // Parse new stream. This won't update the system dictionary or
duke@0 255 // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses.
coleenp@2062 256 static klassOop parse_stream(Symbol* class_name,
duke@0 257 Handle class_loader,
duke@0 258 Handle protection_domain,
duke@0 259 ClassFileStream* st,
jrose@431 260 TRAPS) {
jrose@431 261 KlassHandle nullHandle;
jrose@431 262 return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD);
jrose@431 263 }
coleenp@2062 264 static klassOop parse_stream(Symbol* class_name,
jrose@431 265 Handle class_loader,
jrose@431 266 Handle protection_domain,
jrose@431 267 ClassFileStream* st,
jrose@431 268 KlassHandle host_klass,
jrose@431 269 GrowableArray<Handle>* cp_patches,
duke@0 270 TRAPS);
duke@0 271
duke@0 272 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass)
coleenp@2062 273 static klassOop resolve_from_stream(Symbol* class_name, Handle class_loader,
acorn@973 274 Handle protection_domain,
acorn@973 275 ClassFileStream* st, bool verify, TRAPS);
duke@0 276
duke@0 277 // Lookup an already loaded class. If not found NULL is returned.
coleenp@2062 278 static klassOop find(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
duke@0 279
duke@0 280 // Lookup an already loaded instance or array class.
duke@0 281 // Do not make any queries to class loaders; consult only the cache.
duke@0 282 // If not found NULL is returned.
coleenp@2062 283 static klassOop find_instance_or_array_klass(Symbol* class_name,
duke@0 284 Handle class_loader,
duke@0 285 Handle protection_domain,
duke@0 286 TRAPS);
duke@0 287
jrose@132 288 // If the given name is known to vmSymbols, return the well-know klass:
coleenp@2062 289 static klassOop find_well_known_klass(Symbol* class_name);
jrose@132 290
duke@0 291 // Lookup an instance or array class that has already been loaded
duke@0 292 // either into the given class loader, or else into another class
duke@0 293 // loader that is constrained (via loader constraints) to produce
duke@0 294 // a consistent class. Do not take protection domains into account.
duke@0 295 // Do not make any queries to class loaders; consult only the cache.
duke@0 296 // Return NULL if the class is not found.
duke@0 297 //
duke@0 298 // This function is a strict superset of find_instance_or_array_klass.
duke@0 299 // This function (the unchecked version) makes a conservative prediction
duke@0 300 // of the result of the checked version, assuming successful lookup.
duke@0 301 // If both functions return non-null, they must return the same value.
duke@0 302 // Also, the unchecked version may sometimes be non-null where the
duke@0 303 // checked version is null. This can occur in several ways:
duke@0 304 // 1. No query has yet been made to the class loader.
duke@0 305 // 2. The class loader was queried, but chose not to delegate.
duke@0 306 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain.
duke@0 307 // 4. Loading was attempted, but there was a linkage error of some sort.
duke@0 308 // In all of these cases, the loader constraints on this type are
duke@0 309 // satisfied, and it is safe for classes in the given class loader
duke@0 310 // to manipulate strongly-typed values of the found class, subject
duke@0 311 // to local linkage and access checks.
coleenp@2062 312 static klassOop find_constrained_instance_or_array_klass(Symbol* class_name,
duke@0 313 Handle class_loader,
duke@0 314 TRAPS);
duke@0 315
duke@0 316 // Iterate over all klasses in dictionary
duke@0 317 // Just the classes from defining class loaders
duke@0 318 static void classes_do(void f(klassOop));
duke@0 319 // Added for initialize_itable_for_klass to handle exceptions
duke@0 320 static void classes_do(void f(klassOop, TRAPS), TRAPS);
duke@0 321 // All classes, and their class loaders
duke@0 322 static void classes_do(void f(klassOop, oop));
duke@0 323 // All classes, and their class loaders
duke@0 324 // (added for helpers that use HandleMarks and ResourceMarks)
duke@0 325 static void classes_do(void f(klassOop, oop, TRAPS), TRAPS);
duke@0 326 // All entries in the placeholder table and their class loaders
coleenp@2062 327 static void placeholders_do(void f(Symbol*, oop));
duke@0 328
duke@0 329 // Iterate over all methods in all klasses in dictionary
duke@0 330 static void methods_do(void f(methodOop));
duke@0 331
duke@0 332 // Garbage collection support
duke@0 333
duke@0 334 // This method applies "blk->do_oop" to all the pointers to "system"
duke@0 335 // classes and loaders.
duke@0 336 static void always_strong_oops_do(OopClosure* blk);
duke@0 337 static void always_strong_classes_do(OopClosure* blk);
duke@0 338 // This method applies "blk->do_oop" to all the placeholders.
duke@0 339 static void placeholders_do(OopClosure* blk);
duke@0 340
duke@0 341 // Unload (that is, break root links to) all unmarked classes and
duke@0 342 // loaders. Returns "true" iff something was unloaded.
duke@0 343 static bool do_unloading(BoolObjectClosure* is_alive);
duke@0 344
duke@0 345 // Applies "f->do_oop" to all root oops in the system dictionary.
duke@0 346 static void oops_do(OopClosure* f);
duke@0 347
duke@0 348 // System loader lock
duke@0 349 static oop system_loader_lock() { return _system_loader_lock_obj; }
duke@0 350
duke@0 351 private:
duke@0 352 // Traverses preloaded oops: various system classes. These are
duke@0 353 // guaranteed to be in the perm gen.
duke@0 354 static void preloaded_oops_do(OopClosure* f);
duke@0 355 static void lazily_loaded_oops_do(OopClosure* f);
duke@0 356
duke@0 357 public:
duke@0 358 // Sharing support.
duke@0 359 static void reorder_dictionary();
duke@0 360 static void copy_buckets(char** top, char* end);
duke@0 361 static void copy_table(char** top, char* end);
duke@0 362 static void reverse();
duke@0 363 static void set_shared_dictionary(HashtableBucket* t, int length,
duke@0 364 int number_of_entries);
duke@0 365 // Printing
duke@0 366 static void print() PRODUCT_RETURN;
duke@0 367 static void print_class_statistics() PRODUCT_RETURN;
duke@0 368 static void print_method_statistics() PRODUCT_RETURN;
duke@0 369
duke@0 370 // Number of contained klasses
duke@0 371 // This is both fully loaded classes and classes in the process
duke@0 372 // of being loaded
duke@0 373 static int number_of_classes();
duke@0 374
duke@0 375 // Monotonically increasing counter which grows as classes are
duke@0 376 // loaded or modifications such as hot-swapping or setting/removing
duke@0 377 // of breakpoints are performed
duke@0 378 static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; }
duke@0 379 // Needed by evolution and breakpoint code
duke@0 380 static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; }
duke@0 381
duke@0 382 // Verification
duke@0 383 static void verify();
duke@0 384
duke@0 385 #ifdef ASSERT
coleenp@2062 386 static bool is_internal_format(Symbol* class_name);
duke@0 387 #endif
duke@0 388
duke@0 389 // Verify class is in dictionary
duke@0 390 static void verify_obj_klass_present(Handle obj,
coleenp@2062 391 Symbol* class_name,
duke@0 392 Handle class_loader);
duke@0 393
duke@0 394 // Initialization
duke@0 395 static void initialize(TRAPS);
duke@0 396
duke@0 397 // Fast access to commonly used classes (preloaded)
duke@0 398 static klassOop check_klass(klassOop k) {
duke@0 399 assert(k != NULL, "preloaded klass not initialized");
duke@0 400 return k;
duke@0 401 }
duke@0 402
jrose@132 403 static klassOop check_klass_Pre(klassOop k) { return check_klass(k); }
jrose@132 404 static klassOop check_klass_Opt(klassOop k) { return k; }
jrose@132 405 static klassOop check_klass_Opt_Kernel(klassOop k) { return k; } //== Opt
jrose@132 406 static klassOop check_klass_Opt_Only_JDK15(klassOop k) {
jrose@132 407 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only");
jrose@132 408 return k;
jrose@132 409 }
jrose@132 410 static klassOop check_klass_Opt_Only_JDK14NewRef(klassOop k) {
duke@0 411 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only");
jrose@132 412 // despite the optional loading, if you use this it must be present:
jrose@132 413 return check_klass(k);
duke@0 414 }
duke@0 415
jrose@132 416 static bool initialize_wk_klass(WKID id, int init_opt, TRAPS);
jrose@132 417 static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS);
jrose@132 418 static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) {
jrose@132 419 int limit = (int)end_id + 1;
jrose@132 420 initialize_wk_klasses_until((WKID) limit, start_id, THREAD);
jrose@132 421 }
duke@0 422
jrose@132 423 public:
jrose@132 424 #define WK_KLASS_DECLARE(name, ignore_symbol, option) \
jrose@132 425 static klassOop name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); }
jrose@132 426 WK_KLASSES_DO(WK_KLASS_DECLARE);
jrose@132 427 #undef WK_KLASS_DECLARE
duke@0 428
jrose@132 429 // Local definition for direct access to the private array:
jrose@147 430 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]
duke@0 431
duke@0 432 static klassOop box_klass(BasicType t) {
duke@0 433 assert((uint)t < T_VOID+1, "range check");
duke@0 434 return check_klass(_box_klasses[t]);
duke@0 435 }
duke@0 436 static BasicType box_klass_type(klassOop k); // inverse of box_klass
duke@0 437
duke@0 438 // methods returning lazily loaded klasses
duke@0 439 // The corresponding method to load the class must be called before calling them.
duke@0 440 static klassOop abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); }
duke@0 441
duke@0 442 static void load_abstract_ownable_synchronizer_klass(TRAPS);
duke@0 443
duke@0 444 private:
duke@0 445 // Tells whether ClassLoader.loadClassInternal is present
duke@0 446 static bool has_loadClassInternal() { return _has_loadClassInternal; }
duke@0 447
duke@0 448 public:
duke@0 449 // Tells whether ClassLoader.checkPackageAccess is present
duke@0 450 static bool has_checkPackageAccess() { return _has_checkPackageAccess; }
duke@0 451
never@1142 452 static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; }
never@1142 453 static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; }
duke@0 454
duke@0 455 // Returns default system loader
duke@0 456 static oop java_system_loader();
duke@0 457
duke@0 458 // Compute the default system loader
duke@0 459 static void compute_java_system_loader(TRAPS);
duke@0 460
duke@0 461 private:
duke@0 462 // Mirrors for primitive classes (created eagerly)
duke@0 463 static oop check_mirror(oop m) {
duke@0 464 assert(m != NULL, "mirror not initialized");
duke@0 465 return m;
duke@0 466 }
duke@0 467
duke@0 468 public:
duke@0 469 // Note: java_lang_Class::primitive_type is the inverse of java_mirror
duke@0 470
duke@0 471 // Check class loader constraints
coleenp@2062 472 static bool add_loader_constraint(Symbol* name, Handle loader1,
duke@0 473 Handle loader2, TRAPS);
coleenp@2062 474 static char* check_signature_loaders(Symbol* signature, Handle loader1,
duke@0 475 Handle loader2, bool is_method, TRAPS);
duke@0 476
jrose@710 477 // JSR 292
jrose@710 478 // find the java.dyn.MethodHandles::invoke method for a given signature
coleenp@2062 479 static methodOop find_method_handle_invoke(Symbol* name,
coleenp@2062 480 Symbol* signature,
jrose@1428 481 KlassHandle accessing_klass,
jrose@710 482 TRAPS);
jrose@1427 483 // ask Java to compute a java.dyn.MethodType object for a given signature
coleenp@2062 484 static Handle find_method_handle_type(Symbol* signature,
jrose@1428 485 KlassHandle accessing_klass,
jrose@1713 486 bool for_invokeGeneric,
jrose@1428 487 bool& return_bcp_flag,
jrose@1427 488 TRAPS);
jrose@1522 489 // ask Java to compute a java.dyn.MethodHandle object for a given CP entry
jrose@1522 490 static Handle link_method_handle_constant(KlassHandle caller,
jrose@1522 491 int ref_kind, //e.g., JVM_REF_invokeVirtual
jrose@1522 492 KlassHandle callee,
coleenp@2062 493 Symbol* name,
coleenp@2062 494 Symbol* signature,
jrose@1522 495 TRAPS);
jrose@726 496 // ask Java to create a dynamic call site, while linking an invokedynamic op
jrose@1427 497 static Handle make_dynamic_call_site(Handle bootstrap_method,
jrose@1427 498 // Callee information:
coleenp@2062 499 Symbol* name,
jrose@1427 500 methodHandle signature_invoker,
jrose@1427 501 Handle info,
jrose@1427 502 // Caller information:
jrose@1427 503 methodHandle caller_method,
jrose@726 504 int caller_bci,
jrose@726 505 TRAPS);
jrose@726 506
jrose@726 507 // coordinate with Java about bootstrap methods
jrose@1580 508 static Handle find_bootstrap_method(methodHandle caller_method,
jrose@1580 509 int caller_bci, // N.B. must be an invokedynamic
jrose@1580 510 int cache_index, // must be corresponding main_entry
jrose@1833 511 Handle &argument_info_result, // static BSM arguments, if any
jrose@1580 512 TRAPS);
jrose@726 513
duke@0 514 // Utility for printing loader "name" as part of tracing constraints
duke@0 515 static const char* loader_name(oop loader) {
duke@0 516 return ((loader) == NULL ? "<bootloader>" :
duke@0 517 instanceKlass::cast((loader)->klass())->name()->as_C_string() );
duke@0 518 }
duke@0 519
duke@0 520 // Record the error when the first attempt to resolve a reference from a constant
duke@0 521 // pool entry to a class fails.
coleenp@2062 522 static void add_resolution_error(constantPoolHandle pool, int which, Symbol* error);
coleenp@2062 523 static Symbol* find_resolution_error(constantPoolHandle pool, int which);
duke@0 524
duke@0 525 private:
duke@0 526
duke@0 527 enum Constants {
duke@0 528 _loader_constraint_size = 107, // number of entries in constraint table
duke@0 529 _resolution_error_size = 107, // number of entries in resolution error table
jrose@710 530 _invoke_method_size = 139, // number of entries in invoke method table
duke@0 531 _nof_buckets = 1009 // number of buckets in hash table
duke@0 532 };
duke@0 533
duke@0 534
duke@0 535 // Static variables
duke@0 536
duke@0 537 // Hashtable holding loaded classes.
duke@0 538 static Dictionary* _dictionary;
duke@0 539
duke@0 540 // Hashtable holding placeholders for classes being loaded.
duke@0 541 static PlaceholderTable* _placeholders;
duke@0 542
duke@0 543 // Hashtable holding classes from the shared archive.
duke@0 544 static Dictionary* _shared_dictionary;
duke@0 545
duke@0 546 // Monotonically increasing counter which grows with
duke@0 547 // _number_of_classes as well as hot-swapping and breakpoint setting
duke@0 548 // and removal.
duke@0 549 static int _number_of_modifications;
duke@0 550
duke@0 551 // Lock object for system class loader
duke@0 552 static oop _system_loader_lock_obj;
duke@0 553
duke@0 554 // Constraints on class loaders
duke@0 555 static LoaderConstraintTable* _loader_constraints;
duke@0 556
duke@0 557 // Resolution errors
duke@0 558 static ResolutionErrorTable* _resolution_errors;
duke@0 559
jrose@710 560 // Invoke methods (JSR 292)
jrose@710 561 static SymbolPropertyTable* _invoke_method_table;
jrose@710 562
duke@0 563 public:
duke@0 564 // for VM_CounterDecay iteration support
duke@0 565 friend class CounterDecay;
duke@0 566 static klassOop try_get_next_class();
duke@0 567
duke@0 568 private:
duke@0 569 static void validate_protection_domain(instanceKlassHandle klass,
duke@0 570 Handle class_loader,
duke@0 571 Handle protection_domain, TRAPS);
duke@0 572
duke@0 573 friend class VM_PopulateDumpSharedSpace;
duke@0 574 friend class TraversePlaceholdersClosure;
duke@0 575 static Dictionary* dictionary() { return _dictionary; }
duke@0 576 static Dictionary* shared_dictionary() { return _shared_dictionary; }
duke@0 577 static PlaceholderTable* placeholders() { return _placeholders; }
duke@0 578 static LoaderConstraintTable* constraints() { return _loader_constraints; }
duke@0 579 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; }
jrose@710 580 static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; }
duke@0 581
duke@0 582 // Basic loading operations
coleenp@2062 583 static klassOop resolve_instance_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
coleenp@2062 584 static klassOop resolve_array_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
coleenp@2062 585 static instanceKlassHandle handle_parallel_super_load(Symbol* class_name, Symbol* supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS);
duke@0 586 // Wait on SystemDictionary_lock; unlocks lockObject before
duke@0 587 // waiting; relocks lockObject with correct recursion count
duke@0 588 // after waiting, but before reentering SystemDictionary_lock
duke@0 589 // to preserve lock order semantics.
duke@0 590 static void double_lock_wait(Handle lockObject, TRAPS);
duke@0 591 static void define_instance_class(instanceKlassHandle k, TRAPS);
coleenp@2062 592 static instanceKlassHandle find_or_define_instance_class(Symbol* class_name,
duke@0 593 Handle class_loader,
duke@0 594 instanceKlassHandle k, TRAPS);
coleenp@2062 595 static instanceKlassHandle load_shared_class(Symbol* class_name,
duke@0 596 Handle class_loader, TRAPS);
duke@0 597 static instanceKlassHandle load_shared_class(instanceKlassHandle ik,
duke@0 598 Handle class_loader, TRAPS);
coleenp@2062 599 static instanceKlassHandle load_instance_class(Symbol* class_name, Handle class_loader, TRAPS);
duke@0 600 static Handle compute_loader_lock_object(Handle class_loader, TRAPS);
duke@0 601 static void check_loader_lock_contention(Handle loader_lock, TRAPS);
acorn@514 602 static bool is_parallelCapable(Handle class_loader);
acorn@1075 603 static bool is_parallelDefine(Handle class_loader);
duke@0 604
coleenp@2062 605 static klassOop find_shared_class(Symbol* class_name);
duke@0 606
duke@0 607 // Setup link to hierarchy
duke@0 608 static void add_to_hierarchy(instanceKlassHandle k, TRAPS);
duke@0 609
duke@0 610 private:
duke@0 611 // We pass in the hashtable index so we can calculate it outside of
duke@0 612 // the SystemDictionary_lock.
duke@0 613
duke@0 614 // Basic find on loaded classes
duke@0 615 static klassOop find_class(int index, unsigned int hash,
coleenp@2062 616 Symbol* name, Handle loader);
coleenp@2062 617 static klassOop find_class(Symbol* class_name, Handle class_loader);
duke@0 618
duke@0 619 // Basic find on classes in the midst of being loaded
coleenp@2062 620 static Symbol* find_placeholder(Symbol* name, Handle loader);
duke@0 621
duke@0 622 // Updating entry in dictionary
duke@0 623 // Add a completely loaded class
coleenp@2062 624 static void add_klass(int index, Symbol* class_name,
duke@0 625 Handle class_loader, KlassHandle obj);
duke@0 626
duke@0 627 // Add a placeholder for a class being loaded
duke@0 628 static void add_placeholder(int index,
coleenp@2062 629 Symbol* class_name,
duke@0 630 Handle class_loader);
duke@0 631 static void remove_placeholder(int index,
coleenp@2062 632 Symbol* class_name,
duke@0 633 Handle class_loader);
duke@0 634
duke@0 635 // Performs cleanups after resolve_super_or_fail. This typically needs
duke@0 636 // to be called on failure.
duke@0 637 // Won't throw, but can block.
coleenp@2062 638 static void resolution_cleanups(Symbol* class_name,
duke@0 639 Handle class_loader,
duke@0 640 TRAPS);
duke@0 641
duke@0 642 // Initialization
duke@0 643 static void initialize_preloaded_classes(TRAPS);
duke@0 644
duke@0 645 // Class loader constraints
duke@0 646 static void check_constraints(int index, unsigned int hash,
duke@0 647 instanceKlassHandle k, Handle loader,
duke@0 648 bool defining, TRAPS);
duke@0 649 static void update_dictionary(int d_index, unsigned int d_hash,
duke@0 650 int p_index, unsigned int p_hash,
duke@0 651 instanceKlassHandle k, Handle loader, TRAPS);
duke@0 652
duke@0 653 // Variables holding commonly used klasses (preloaded)
jrose@132 654 static klassOop _well_known_klasses[];
duke@0 655
duke@0 656 // Lazily loaded klasses
duke@0 657 static volatile klassOop _abstract_ownable_synchronizer_klass;
duke@0 658
jrose@132 659 // table of box klasses (int_klass, etc.)
duke@0 660 static klassOop _box_klasses[T_VOID+1];
duke@0 661
duke@0 662 static oop _java_system_loader;
duke@0 663
duke@0 664 static bool _has_loadClassInternal;
duke@0 665 static bool _has_checkPackageAccess;
duke@0 666 };
jrose@665 667
jrose@665 668 class SystemDictionaryHandles : AllStatic {
jrose@665 669 public:
jrose@665 670 #define WK_KLASS_HANDLE_DECLARE(name, ignore_symbol, option) \
jrose@665 671 static KlassHandle name() { \
jrose@665 672 SystemDictionary::name(); \
jrose@665 673 klassOop* loc = &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \
jrose@665 674 return KlassHandle(loc, true); \
jrose@665 675 }
jrose@665 676 WK_KLASSES_DO(WK_KLASS_HANDLE_DECLARE);
jrose@665 677 #undef WK_KLASS_HANDLE_DECLARE
jrose@665 678
jrose@665 679 static KlassHandle box_klass(BasicType t);
jrose@665 680 };
stefank@1879 681
stefank@1879 682 #endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP