annotate src/share/vm/classfile/systemDictionary.hpp @ 3534:1d7922586cf6

7023639: JSR 292 method handle invocation needs a fast path for compiled code 6984705: JSR 292 method handle creation should not go through JNI Summary: remove assembly code for JDK 7 chained method handles Reviewed-by: jrose, twisti, kvn, mhaupt Contributed-by: John Rose <john.r.rose@oracle.com>, Christian Thalinger <christian.thalinger@oracle.com>, Michael Haupt <michael.haupt@oracle.com>
author twisti
date Tue, 24 Jul 2012 10:51:00 -0700
parents d2a62e0f25eb
children da91efe96a93
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@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;
duke@0 187 friend class CompactingPermGenGen;
jrose@665 188 friend class SystemDictionaryHandles;
duke@0 189 NOT_PRODUCT(friend class instanceKlassKlass;)
duke@0 190
duke@0 191 public:
jrose@132 192 enum WKID {
jrose@132 193 NO_WKID = 0,
jrose@132 194
never@2702 195 #define WK_KLASS_ENUM(name, symbol, ignore_o) WK_KLASS_ENUM_NAME(name), WK_KLASS_ENUM_NAME(symbol) = WK_KLASS_ENUM_NAME(name),
jrose@132 196 WK_KLASSES_DO(WK_KLASS_ENUM)
jrose@132 197 #undef WK_KLASS_ENUM
jrose@132 198
jrose@132 199 WKID_LIMIT,
jrose@132 200
jrose@132 201 FIRST_WKID = NO_WKID + 1
jrose@132 202 };
jrose@132 203
jrose@132 204 enum InitOption {
jrose@132 205 Pre, // preloaded; error if not present
twisti@2263 206 Pre_JSR292, // preloaded if EnableInvokeDynamic
jrose@132 207
jrose@132 208 // Order is significant. Options before this point require resolve_or_fail.
jrose@132 209 // Options after this point will use resolve_or_null instead.
jrose@132 210
jrose@132 211 Opt, // preload tried; NULL if not present
jrose@132 212 Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection
jrose@132 213 Opt_Only_JDK15, // preload tried; use only with JDK1.5+
jrose@132 214 Opt_Kernel, // preload tried only #ifdef KERNEL
jrose@132 215 OPTION_LIMIT,
jrose@132 216 CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT)
jrose@132 217 };
jrose@132 218
jrose@132 219
duke@0 220 // Returns a class with a given class name and class loader. Loads the
duke@0 221 // class if needed. If not found a NoClassDefFoundError or a
duke@0 222 // ClassNotFoundException is thrown, depending on the value on the
duke@0 223 // throw_error flag. For most uses the throw_error argument should be set
duke@0 224 // to true.
duke@0 225
coleenp@2062 226 static klassOop resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS);
duke@0 227 // Convenient call for null loader and protection domain.
coleenp@2062 228 static klassOop resolve_or_fail(Symbol* class_name, bool throw_error, TRAPS);
duke@0 229 private:
duke@0 230 // handle error translation for resolve_or_null results
coleenp@2062 231 static klassOop handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS);
duke@0 232
duke@0 233 public:
duke@0 234
duke@0 235 // Returns a class with a given class name and class loader.
duke@0 236 // Loads the class if needed. If not found NULL is returned.
coleenp@2062 237 static klassOop resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
duke@0 238 // Version with null loader and protection domain
coleenp@2062 239 static klassOop resolve_or_null(Symbol* class_name, TRAPS);
duke@0 240
duke@0 241 // Resolve a superclass or superinterface. Called from ClassFileParser,
duke@0 242 // parse_interfaces, resolve_instance_class_or_null, load_shared_class
duke@0 243 // "child_name" is the class whose super class or interface is being resolved.
coleenp@2062 244 static klassOop resolve_super_or_fail(Symbol* child_name,
coleenp@2062 245 Symbol* class_name,
duke@0 246 Handle class_loader,
duke@0 247 Handle protection_domain,
duke@0 248 bool is_superclass,
duke@0 249 TRAPS);
duke@0 250
duke@0 251 // Parse new stream. This won't update the system dictionary or
duke@0 252 // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses.
coleenp@2062 253 static klassOop parse_stream(Symbol* class_name,
duke@0 254 Handle class_loader,
duke@0 255 Handle protection_domain,
duke@0 256 ClassFileStream* st,
jrose@431 257 TRAPS) {
jrose@431 258 KlassHandle nullHandle;
jrose@431 259 return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD);
jrose@431 260 }
coleenp@2062 261 static klassOop parse_stream(Symbol* class_name,
jrose@431 262 Handle class_loader,
jrose@431 263 Handle protection_domain,
jrose@431 264 ClassFileStream* st,
jrose@431 265 KlassHandle host_klass,
jrose@431 266 GrowableArray<Handle>* cp_patches,
duke@0 267 TRAPS);
duke@0 268
duke@0 269 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass)
coleenp@2062 270 static klassOop resolve_from_stream(Symbol* class_name, Handle class_loader,
acorn@973 271 Handle protection_domain,
acorn@973 272 ClassFileStream* st, bool verify, TRAPS);
duke@0 273
duke@0 274 // Lookup an already loaded class. If not found NULL is returned.
coleenp@2062 275 static klassOop find(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
duke@0 276
duke@0 277 // Lookup an already loaded instance or array class.
duke@0 278 // Do not make any queries to class loaders; consult only the cache.
duke@0 279 // If not found NULL is returned.
coleenp@2062 280 static klassOop find_instance_or_array_klass(Symbol* class_name,
duke@0 281 Handle class_loader,
duke@0 282 Handle protection_domain,
duke@0 283 TRAPS);
duke@0 284
jrose@132 285 // If the given name is known to vmSymbols, return the well-know klass:
coleenp@2062 286 static klassOop find_well_known_klass(Symbol* class_name);
jrose@132 287
duke@0 288 // Lookup an instance or array class that has already been loaded
duke@0 289 // either into the given class loader, or else into another class
duke@0 290 // loader that is constrained (via loader constraints) to produce
duke@0 291 // a consistent class. Do not take protection domains into account.
duke@0 292 // Do not make any queries to class loaders; consult only the cache.
duke@0 293 // Return NULL if the class is not found.
duke@0 294 //
duke@0 295 // This function is a strict superset of find_instance_or_array_klass.
duke@0 296 // This function (the unchecked version) makes a conservative prediction
duke@0 297 // of the result of the checked version, assuming successful lookup.
duke@0 298 // If both functions return non-null, they must return the same value.
duke@0 299 // Also, the unchecked version may sometimes be non-null where the
duke@0 300 // checked version is null. This can occur in several ways:
duke@0 301 // 1. No query has yet been made to the class loader.
duke@0 302 // 2. The class loader was queried, but chose not to delegate.
duke@0 303 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain.
duke@0 304 // 4. Loading was attempted, but there was a linkage error of some sort.
duke@0 305 // In all of these cases, the loader constraints on this type are
duke@0 306 // satisfied, and it is safe for classes in the given class loader
duke@0 307 // to manipulate strongly-typed values of the found class, subject
duke@0 308 // to local linkage and access checks.
coleenp@2062 309 static klassOop find_constrained_instance_or_array_klass(Symbol* class_name,
duke@0 310 Handle class_loader,
duke@0 311 TRAPS);
duke@0 312
duke@0 313 // Iterate over all klasses in dictionary
duke@0 314 // Just the classes from defining class loaders
duke@0 315 static void classes_do(void f(klassOop));
duke@0 316 // Added for initialize_itable_for_klass to handle exceptions
duke@0 317 static void classes_do(void f(klassOop, TRAPS), TRAPS);
duke@0 318 // All classes, and their class loaders
duke@0 319 static void classes_do(void f(klassOop, oop));
duke@0 320 // All classes, and their class loaders
duke@0 321 // (added for helpers that use HandleMarks and ResourceMarks)
duke@0 322 static void classes_do(void f(klassOop, oop, TRAPS), TRAPS);
duke@0 323 // All entries in the placeholder table and their class loaders
coleenp@2062 324 static void placeholders_do(void f(Symbol*, oop));
duke@0 325
duke@0 326 // Iterate over all methods in all klasses in dictionary
duke@0 327 static void methods_do(void f(methodOop));
duke@0 328
duke@0 329 // Garbage collection support
duke@0 330
duke@0 331 // This method applies "blk->do_oop" to all the pointers to "system"
duke@0 332 // classes and loaders.
duke@0 333 static void always_strong_oops_do(OopClosure* blk);
duke@0 334 static void always_strong_classes_do(OopClosure* blk);
duke@0 335 // This method applies "blk->do_oop" to all the placeholders.
duke@0 336 static void placeholders_do(OopClosure* blk);
duke@0 337
duke@0 338 // Unload (that is, break root links to) all unmarked classes and
duke@0 339 // loaders. Returns "true" iff something was unloaded.
duke@0 340 static bool do_unloading(BoolObjectClosure* is_alive);
duke@0 341
acorn@3056 342 static int calculate_systemdictionary_size(int loadedclasses);
acorn@3056 343
duke@0 344 // Applies "f->do_oop" to all root oops in the system dictionary.
duke@0 345 static void oops_do(OopClosure* f);
duke@0 346
duke@0 347 // System loader lock
duke@0 348 static oop system_loader_lock() { return _system_loader_lock_obj; }
duke@0 349
duke@0 350 private:
duke@0 351 // Traverses preloaded oops: various system classes. These are
duke@0 352 // guaranteed to be in the perm gen.
duke@0 353 static void preloaded_oops_do(OopClosure* f);
duke@0 354 static void lazily_loaded_oops_do(OopClosure* f);
duke@0 355
duke@0 356 public:
duke@0 357 // Sharing support.
duke@0 358 static void reorder_dictionary();
duke@0 359 static void copy_buckets(char** top, char* end);
duke@0 360 static void copy_table(char** top, char* end);
duke@0 361 static void reverse();
zgu@3465 362 static void set_shared_dictionary(HashtableBucket<mtClass>* t, int length,
duke@0 363 int number_of_entries);
duke@0 364 // Printing
duke@0 365 static void print() PRODUCT_RETURN;
duke@0 366 static void print_class_statistics() PRODUCT_RETURN;
duke@0 367 static void print_method_statistics() PRODUCT_RETURN;
duke@0 368
duke@0 369 // Number of contained klasses
duke@0 370 // This is both fully loaded classes and classes in the process
duke@0 371 // of being loaded
duke@0 372 static int number_of_classes();
duke@0 373
duke@0 374 // Monotonically increasing counter which grows as classes are
duke@0 375 // loaded or modifications such as hot-swapping or setting/removing
duke@0 376 // of breakpoints are performed
duke@0 377 static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; }
duke@0 378 // Needed by evolution and breakpoint code
duke@0 379 static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; }
duke@0 380
duke@0 381 // Verification
duke@0 382 static void verify();
duke@0 383
duke@0 384 #ifdef ASSERT
coleenp@2062 385 static bool is_internal_format(Symbol* class_name);
duke@0 386 #endif
duke@0 387
duke@0 388 // Verify class is in dictionary
duke@0 389 static void verify_obj_klass_present(Handle obj,
coleenp@2062 390 Symbol* class_name,
duke@0 391 Handle class_loader);
duke@0 392
duke@0 393 // Initialization
duke@0 394 static void initialize(TRAPS);
duke@0 395
duke@0 396 // Fast access to commonly used classes (preloaded)
duke@0 397 static klassOop check_klass(klassOop k) {
duke@0 398 assert(k != NULL, "preloaded klass not initialized");
duke@0 399 return k;
duke@0 400 }
duke@0 401
jrose@132 402 static klassOop check_klass_Pre(klassOop k) { return check_klass(k); }
jrose@2203 403 static klassOop check_klass_Pre_JSR292(klassOop k) { return EnableInvokeDynamic ? check_klass(k) : 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:
never@2702 424 #define WK_KLASS_DECLARE(name, 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
never@2702 429 static klassOop well_known_klass(WKID id) {
never@2702 430 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob");
never@2702 431 return _well_known_klasses[id];
never@2702 432 }
never@2702 433
jrose@132 434 // Local definition for direct access to the private array:
jrose@147 435 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]
duke@0 436
duke@0 437 static klassOop box_klass(BasicType t) {
duke@0 438 assert((uint)t < T_VOID+1, "range check");
duke@0 439 return check_klass(_box_klasses[t]);
duke@0 440 }
duke@0 441 static BasicType box_klass_type(klassOop k); // inverse of box_klass
duke@0 442
duke@0 443 // methods returning lazily loaded klasses
duke@0 444 // The corresponding method to load the class must be called before calling them.
duke@0 445 static klassOop abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); }
duke@0 446
duke@0 447 static void load_abstract_ownable_synchronizer_klass(TRAPS);
duke@0 448
duke@0 449 private:
duke@0 450 // Tells whether ClassLoader.loadClassInternal is present
duke@0 451 static bool has_loadClassInternal() { return _has_loadClassInternal; }
duke@0 452
duke@0 453 public:
duke@0 454 // Tells whether ClassLoader.checkPackageAccess is present
duke@0 455 static bool has_checkPackageAccess() { return _has_checkPackageAccess; }
duke@0 456
never@1142 457 static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; }
never@1142 458 static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; }
duke@0 459
duke@0 460 // Returns default system loader
duke@0 461 static oop java_system_loader();
duke@0 462
duke@0 463 // Compute the default system loader
duke@0 464 static void compute_java_system_loader(TRAPS);
duke@0 465
duke@0 466 private:
duke@0 467 // Mirrors for primitive classes (created eagerly)
duke@0 468 static oop check_mirror(oop m) {
duke@0 469 assert(m != NULL, "mirror not initialized");
duke@0 470 return m;
duke@0 471 }
duke@0 472
duke@0 473 public:
duke@0 474 // Note: java_lang_Class::primitive_type is the inverse of java_mirror
duke@0 475
duke@0 476 // Check class loader constraints
coleenp@2062 477 static bool add_loader_constraint(Symbol* name, Handle loader1,
duke@0 478 Handle loader2, TRAPS);
coleenp@2062 479 static char* check_signature_loaders(Symbol* signature, Handle loader1,
duke@0 480 Handle loader2, bool is_method, TRAPS);
duke@0 481
jrose@710 482 // JSR 292
twisti@3534 483 // find a java.lang.invoke.MethodHandle.invoke* method for a given signature
twisti@3534 484 // (asks Java to compute it if necessary, except in a compiler thread)
twisti@3534 485 static methodHandle find_method_handle_invoker(Symbol* name,
twisti@3534 486 Symbol* signature,
twisti@3534 487 KlassHandle accessing_klass,
twisti@3534 488 Handle *appendix_result,
twisti@3534 489 TRAPS);
twisti@3534 490 // for a given signature, find the internal MethodHandle method (linkTo* or invokeBasic)
twisti@3534 491 // (does not ask Java, since this is a low-level intrinsic defined by the JVM)
twisti@3534 492 static methodHandle find_method_handle_intrinsic(vmIntrinsics::ID iid,
twisti@3534 493 Symbol* signature,
twisti@3534 494 TRAPS);
twisti@3534 495 // find a java.lang.invoke.MethodType object for a given signature
twisti@3534 496 // (asks Java to compute it if necessary, except in a compiler thread)
coleenp@2062 497 static Handle find_method_handle_type(Symbol* signature,
jrose@1428 498 KlassHandle accessing_klass,
jrose@1427 499 TRAPS);
twisti@3534 500
jrose@2204 501 // ask Java to compute a java.lang.invoke.MethodHandle object for a given CP entry
jrose@1522 502 static Handle link_method_handle_constant(KlassHandle caller,
jrose@1522 503 int ref_kind, //e.g., JVM_REF_invokeVirtual
jrose@1522 504 KlassHandle callee,
coleenp@2062 505 Symbol* name,
coleenp@2062 506 Symbol* signature,
jrose@1522 507 TRAPS);
twisti@3534 508
jrose@726 509 // ask Java to create a dynamic call site, while linking an invokedynamic op
twisti@3534 510 static methodHandle find_dynamic_call_site_invoker(KlassHandle caller,
twisti@3534 511 Handle bootstrap_method,
twisti@3534 512 Symbol* name,
twisti@3534 513 Symbol* type,
twisti@3534 514 Handle *appendix_result,
twisti@3534 515 TRAPS);
jrose@726 516
duke@0 517 // Utility for printing loader "name" as part of tracing constraints
duke@0 518 static const char* loader_name(oop loader) {
duke@0 519 return ((loader) == NULL ? "<bootloader>" :
duke@0 520 instanceKlass::cast((loader)->klass())->name()->as_C_string() );
duke@0 521 }
duke@0 522
duke@0 523 // Record the error when the first attempt to resolve a reference from a constant
duke@0 524 // pool entry to a class fails.
coleenp@2062 525 static void add_resolution_error(constantPoolHandle pool, int which, Symbol* error);
coleenp@2062 526 static Symbol* find_resolution_error(constantPoolHandle pool, int which);
duke@0 527
duke@0 528 private:
duke@0 529
duke@0 530 enum Constants {
duke@0 531 _loader_constraint_size = 107, // number of entries in constraint table
duke@0 532 _resolution_error_size = 107, // number of entries in resolution error table
jrose@710 533 _invoke_method_size = 139, // number of entries in invoke method table
acorn@3056 534 _nof_buckets = 1009, // number of buckets in hash table for placeholders
acorn@3056 535 _old_default_sdsize = 1009, // backward compat for system dictionary size
acorn@3056 536 _prime_array_size = 8, // array of primes for system dictionary size
acorn@3056 537 _average_depth_goal = 3 // goal for lookup length
duke@0 538 };
duke@0 539
duke@0 540
duke@0 541 // Static variables
duke@0 542
acorn@3056 543 // hashtable sizes for system dictionary to allow growth
acorn@3056 544 // prime numbers for system dictionary size
acorn@3056 545 static int _sdgeneration;
acorn@3056 546 static const int _primelist[_prime_array_size];
acorn@3056 547
duke@0 548 // Hashtable holding loaded classes.
duke@0 549 static Dictionary* _dictionary;
duke@0 550
duke@0 551 // Hashtable holding placeholders for classes being loaded.
duke@0 552 static PlaceholderTable* _placeholders;
duke@0 553
duke@0 554 // Hashtable holding classes from the shared archive.
duke@0 555 static Dictionary* _shared_dictionary;
duke@0 556
duke@0 557 // Monotonically increasing counter which grows with
duke@0 558 // _number_of_classes as well as hot-swapping and breakpoint setting
duke@0 559 // and removal.
duke@0 560 static int _number_of_modifications;
duke@0 561
duke@0 562 // Lock object for system class loader
duke@0 563 static oop _system_loader_lock_obj;
duke@0 564
duke@0 565 // Constraints on class loaders
duke@0 566 static LoaderConstraintTable* _loader_constraints;
duke@0 567
duke@0 568 // Resolution errors
duke@0 569 static ResolutionErrorTable* _resolution_errors;
duke@0 570
jrose@710 571 // Invoke methods (JSR 292)
jrose@710 572 static SymbolPropertyTable* _invoke_method_table;
jrose@710 573
duke@0 574 public:
duke@0 575 // for VM_CounterDecay iteration support
duke@0 576 friend class CounterDecay;
duke@0 577 static klassOop try_get_next_class();
duke@0 578
duke@0 579 private:
duke@0 580 static void validate_protection_domain(instanceKlassHandle klass,
duke@0 581 Handle class_loader,
duke@0 582 Handle protection_domain, TRAPS);
duke@0 583
duke@0 584 friend class VM_PopulateDumpSharedSpace;
duke@0 585 friend class TraversePlaceholdersClosure;
duke@0 586 static Dictionary* dictionary() { return _dictionary; }
duke@0 587 static Dictionary* shared_dictionary() { return _shared_dictionary; }
duke@0 588 static PlaceholderTable* placeholders() { return _placeholders; }
duke@0 589 static LoaderConstraintTable* constraints() { return _loader_constraints; }
duke@0 590 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; }
jrose@710 591 static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; }
duke@0 592
duke@0 593 // Basic loading operations
coleenp@2062 594 static klassOop resolve_instance_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
coleenp@2062 595 static klassOop resolve_array_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
coleenp@2062 596 static instanceKlassHandle handle_parallel_super_load(Symbol* class_name, Symbol* supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS);
duke@0 597 // Wait on SystemDictionary_lock; unlocks lockObject before
duke@0 598 // waiting; relocks lockObject with correct recursion count
duke@0 599 // after waiting, but before reentering SystemDictionary_lock
duke@0 600 // to preserve lock order semantics.
duke@0 601 static void double_lock_wait(Handle lockObject, TRAPS);
duke@0 602 static void define_instance_class(instanceKlassHandle k, TRAPS);
coleenp@2062 603 static instanceKlassHandle find_or_define_instance_class(Symbol* class_name,
duke@0 604 Handle class_loader,
duke@0 605 instanceKlassHandle k, TRAPS);
coleenp@2062 606 static instanceKlassHandle load_shared_class(Symbol* class_name,
duke@0 607 Handle class_loader, TRAPS);
duke@0 608 static instanceKlassHandle load_shared_class(instanceKlassHandle ik,
duke@0 609 Handle class_loader, TRAPS);
coleenp@2062 610 static instanceKlassHandle load_instance_class(Symbol* class_name, Handle class_loader, TRAPS);
duke@0 611 static Handle compute_loader_lock_object(Handle class_loader, TRAPS);
duke@0 612 static void check_loader_lock_contention(Handle loader_lock, TRAPS);
acorn@514 613 static bool is_parallelCapable(Handle class_loader);
acorn@1075 614 static bool is_parallelDefine(Handle class_loader);
duke@0 615
coleenp@2062 616 static klassOop find_shared_class(Symbol* class_name);
duke@0 617
duke@0 618 // Setup link to hierarchy
duke@0 619 static void add_to_hierarchy(instanceKlassHandle k, TRAPS);
duke@0 620
duke@0 621 private:
duke@0 622 // We pass in the hashtable index so we can calculate it outside of
duke@0 623 // the SystemDictionary_lock.
duke@0 624
duke@0 625 // Basic find on loaded classes
duke@0 626 static klassOop find_class(int index, unsigned int hash,
coleenp@2062 627 Symbol* name, Handle loader);
coleenp@2062 628 static klassOop find_class(Symbol* class_name, Handle class_loader);
duke@0 629
duke@0 630 // Basic find on classes in the midst of being loaded
coleenp@2062 631 static Symbol* find_placeholder(Symbol* name, Handle loader);
duke@0 632
duke@0 633 // Updating entry in dictionary
duke@0 634 // Add a completely loaded class
coleenp@2062 635 static void add_klass(int index, Symbol* class_name,
duke@0 636 Handle class_loader, KlassHandle obj);
duke@0 637
duke@0 638 // Add a placeholder for a class being loaded
duke@0 639 static void add_placeholder(int index,
coleenp@2062 640 Symbol* class_name,
duke@0 641 Handle class_loader);
duke@0 642 static void remove_placeholder(int index,
coleenp@2062 643 Symbol* class_name,
duke@0 644 Handle class_loader);
duke@0 645
duke@0 646 // Performs cleanups after resolve_super_or_fail. This typically needs
duke@0 647 // to be called on failure.
duke@0 648 // Won't throw, but can block.
coleenp@2062 649 static void resolution_cleanups(Symbol* class_name,
duke@0 650 Handle class_loader,
duke@0 651 TRAPS);
duke@0 652
duke@0 653 // Initialization
duke@0 654 static void initialize_preloaded_classes(TRAPS);
duke@0 655
duke@0 656 // Class loader constraints
duke@0 657 static void check_constraints(int index, unsigned int hash,
duke@0 658 instanceKlassHandle k, Handle loader,
duke@0 659 bool defining, TRAPS);
duke@0 660 static void update_dictionary(int d_index, unsigned int d_hash,
duke@0 661 int p_index, unsigned int p_hash,
duke@0 662 instanceKlassHandle k, Handle loader, TRAPS);
duke@0 663
duke@0 664 // Variables holding commonly used klasses (preloaded)
jrose@132 665 static klassOop _well_known_klasses[];
duke@0 666
duke@0 667 // Lazily loaded klasses
duke@0 668 static volatile klassOop _abstract_ownable_synchronizer_klass;
duke@0 669
jrose@132 670 // table of box klasses (int_klass, etc.)
duke@0 671 static klassOop _box_klasses[T_VOID+1];
duke@0 672
duke@0 673 static oop _java_system_loader;
duke@0 674
duke@0 675 static bool _has_loadClassInternal;
duke@0 676 static bool _has_checkPackageAccess;
duke@0 677 };
jrose@665 678
jrose@665 679 class SystemDictionaryHandles : AllStatic {
jrose@665 680 public:
jrose@665 681 #define WK_KLASS_HANDLE_DECLARE(name, ignore_symbol, option) \
jrose@665 682 static KlassHandle name() { \
jrose@665 683 SystemDictionary::name(); \
jrose@665 684 klassOop* loc = &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \
jrose@665 685 return KlassHandle(loc, true); \
jrose@665 686 }
jrose@665 687 WK_KLASSES_DO(WK_KLASS_HANDLE_DECLARE);
jrose@665 688 #undef WK_KLASS_HANDLE_DECLARE
jrose@665 689
jrose@665 690 static KlassHandle box_klass(BasicType t);
jrose@665 691 };
stefank@1879 692
stefank@1879 693 #endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP