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rev 6864 : 8061651: Interface to the Lookup Index Cache to improve URLClassPath search time
Summary: Implemented the interface in sun.misc.URLClassPath and corresponding JVM_XXX APIs
Reviewed-by: mchung, acorn, jiangli, dholmes
rev 6875 : 8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
Reviewed-by: mgerdin, coleenp, bdelsart
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--- old/src/share/vm/classfile/systemDictionary.hpp
+++ new/src/share/vm/classfile/systemDictionary.hpp
1 1 /*
2 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 4 *
5 5 * This code is free software; you can redistribute it and/or modify it
6 6 * under the terms of the GNU General Public License version 2 only, as
7 7 * published by the Free Software Foundation.
8 8 *
9 9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 12 * version 2 for more details (a copy is included in the LICENSE file that
13 13 * accompanied this code).
14 14 *
15 15 * You should have received a copy of the GNU General Public License version
16 16 * 2 along with this work; if not, write to the Free Software Foundation,
17 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 18 *
19 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 20 * or visit www.oracle.com if you need additional information or have any
21 21 * questions.
22 22 *
23 23 */
24 24
25 25 #ifndef SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP
26 26 #define SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP
27 27
28 28 #include "classfile/classFileStream.hpp"
29 29 #include "classfile/classLoader.hpp"
30 30 #include "oops/objArrayOop.hpp"
31 31 #include "oops/symbol.hpp"
32 32 #include "runtime/java.hpp"
33 33 #include "runtime/reflectionUtils.hpp"
34 34 #include "utilities/hashtable.hpp"
35 35 #include "utilities/hashtable.inline.hpp"
36 36
37 37
38 38 // The system dictionary stores all loaded classes and maps:
39 39 //
40 40 // [class name,class loader] -> class i.e. [Symbol*,oop] -> Klass*
41 41 //
42 42 // Classes are loaded lazily. The default VM class loader is
43 43 // represented as NULL.
44 44
45 45 // The underlying data structure is an open hash table with a fixed number
46 46 // of buckets. During loading the loader object is locked, (for the VM loader
47 47 // a private lock object is used). Class loading can thus be done concurrently,
48 48 // but only by different loaders.
49 49 //
50 50 // During loading a placeholder (name, loader) is temporarily placed in
51 51 // a side data structure, and is used to detect ClassCircularityErrors
52 52 // and to perform verification during GC. A GC can occur in the midst
53 53 // of class loading, as we call out to Java, have to take locks, etc.
54 54 //
55 55 // When class loading is finished, a new entry is added to the system
56 56 // dictionary and the place holder is removed. Note that the protection
57 57 // domain field of the system dictionary has not yet been filled in when
58 58 // the "real" system dictionary entry is created.
59 59 //
60 60 // Clients of this class who are interested in finding if a class has
61 61 // been completely loaded -- not classes in the process of being loaded --
62 62 // can read the SystemDictionary unlocked. This is safe because
63 63 // - entries are only deleted at safepoints
64 64 // - readers cannot come to a safepoint while actively examining
65 65 // an entry (an entry cannot be deleted from under a reader)
66 66 // - entries must be fully formed before they are available to concurrent
67 67 // readers (we must ensure write ordering)
68 68 //
69 69 // Note that placeholders are deleted at any time, as they are removed
70 70 // when a class is completely loaded. Therefore, readers as well as writers
71 71 // of placeholders must hold the SystemDictionary_lock.
72 72 //
73 73
74 74 class Dictionary;
75 75 class PlaceholderTable;
76 76 class LoaderConstraintTable;
77 77 template <MEMFLAGS F> class HashtableBucket;
78 78 class ResolutionErrorTable;
79 79 class SymbolPropertyTable;
80 80 class Ticks;
81 81
82 82 // Certain classes are preloaded, such as java.lang.Object and java.lang.String.
83 83 // They are all "well-known", in the sense that no class loader is allowed
84 84 // to provide a different definition.
85 85 //
86 86 // These klasses must all have names defined in vmSymbols.
87 87
88 88 #define WK_KLASS_ENUM_NAME(kname) kname##_knum
89 89
90 90 // Each well-known class has a short klass name (like object_klass),
91 91 // a vmSymbol name (like java_lang_Object), and a flag word
92 92 // that makes some minor distinctions, like whether the klass
93 93 // is preloaded, optional, release-specific, etc.
94 94 // The order of these definitions is significant; it is the order in which
95 95 // preloading is actually performed by initialize_preloaded_classes.
96 96
97 97 #define WK_KLASSES_DO(do_klass) \
98 98 /* well-known classes */ \
99 99 do_klass(Object_klass, java_lang_Object, Pre ) \
100 100 do_klass(String_klass, java_lang_String, Pre ) \
101 101 do_klass(Class_klass, java_lang_Class, Pre ) \
102 102 do_klass(Cloneable_klass, java_lang_Cloneable, Pre ) \
103 103 do_klass(ClassLoader_klass, java_lang_ClassLoader, Pre ) \
104 104 do_klass(Serializable_klass, java_io_Serializable, Pre ) \
105 105 do_klass(System_klass, java_lang_System, Pre ) \
106 106 do_klass(Throwable_klass, java_lang_Throwable, Pre ) \
107 107 do_klass(Error_klass, java_lang_Error, Pre ) \
108 108 do_klass(ThreadDeath_klass, java_lang_ThreadDeath, Pre ) \
109 109 do_klass(Exception_klass, java_lang_Exception, Pre ) \
110 110 do_klass(RuntimeException_klass, java_lang_RuntimeException, Pre ) \
111 111 do_klass(SecurityManager_klass, java_lang_SecurityManager, Pre ) \
112 112 do_klass(ProtectionDomain_klass, java_security_ProtectionDomain, Pre ) \
113 113 do_klass(AccessControlContext_klass, java_security_AccessControlContext, Pre ) \
114 114 do_klass(SecureClassLoader_klass, java_security_SecureClassLoader, Pre ) \
115 115 do_klass(ClassNotFoundException_klass, java_lang_ClassNotFoundException, Pre ) \
116 116 do_klass(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre ) \
117 117 do_klass(LinkageError_klass, java_lang_LinkageError, Pre ) \
118 118 do_klass(ClassCastException_klass, java_lang_ClassCastException, Pre ) \
119 119 do_klass(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre ) \
120 120 do_klass(VirtualMachineError_klass, java_lang_VirtualMachineError, Pre ) \
121 121 do_klass(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre ) \
122 122 do_klass(StackOverflowError_klass, java_lang_StackOverflowError, Pre ) \
123 123 do_klass(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre ) \
124 124 do_klass(Reference_klass, java_lang_ref_Reference, Pre ) \
125 125 \
126 126 /* Preload ref klasses and set reference types */ \
127 127 do_klass(SoftReference_klass, java_lang_ref_SoftReference, Pre ) \
128 128 do_klass(WeakReference_klass, java_lang_ref_WeakReference, Pre ) \
129 129 do_klass(FinalReference_klass, java_lang_ref_FinalReference, Pre ) \
130 130 do_klass(PhantomReference_klass, java_lang_ref_PhantomReference, Pre ) \
131 131 do_klass(Finalizer_klass, java_lang_ref_Finalizer, Pre ) \
132 132 \
133 133 do_klass(Thread_klass, java_lang_Thread, Pre ) \
134 134 do_klass(ThreadGroup_klass, java_lang_ThreadGroup, Pre ) \
135 135 do_klass(Properties_klass, java_util_Properties, Pre ) \
136 136 do_klass(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject, Pre ) \
137 137 do_klass(reflect_Field_klass, java_lang_reflect_Field, Pre ) \
138 138 do_klass(reflect_Parameter_klass, java_lang_reflect_Parameter, Opt ) \
139 139 do_klass(reflect_Method_klass, java_lang_reflect_Method, Pre ) \
140 140 do_klass(reflect_Constructor_klass, java_lang_reflect_Constructor, Pre ) \
141 141 \
142 142 /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \
143 143 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
144 144 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
145 145 do_klass(reflect_MagicAccessorImpl_klass, sun_reflect_MagicAccessorImpl, Opt ) \
146 146 do_klass(reflect_MethodAccessorImpl_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \
147 147 do_klass(reflect_ConstructorAccessorImpl_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \
148 148 do_klass(reflect_DelegatingClassLoader_klass, sun_reflect_DelegatingClassLoader, Opt ) \
149 149 do_klass(reflect_ConstantPool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15 ) \
150 150 do_klass(reflect_UnsafeStaticFieldAccessorImpl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15 ) \
151 151 do_klass(reflect_CallerSensitive_klass, sun_reflect_CallerSensitive, Opt ) \
152 152 \
153 153 /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \
154 154 do_klass(DirectMethodHandle_klass, java_lang_invoke_DirectMethodHandle, Opt ) \
155 155 do_klass(MethodHandle_klass, java_lang_invoke_MethodHandle, Pre_JSR292 ) \
156 156 do_klass(MemberName_klass, java_lang_invoke_MemberName, Pre_JSR292 ) \
157 157 do_klass(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives, Pre_JSR292 ) \
158 158 do_klass(LambdaForm_klass, java_lang_invoke_LambdaForm, Opt ) \
159 159 do_klass(MethodType_klass, java_lang_invoke_MethodType, Pre_JSR292 ) \
160 160 do_klass(BootstrapMethodError_klass, java_lang_BootstrapMethodError, Pre_JSR292 ) \
161 161 do_klass(CallSite_klass, java_lang_invoke_CallSite, Pre_JSR292 ) \
162 162 do_klass(ConstantCallSite_klass, java_lang_invoke_ConstantCallSite, Pre_JSR292 ) \
163 163 do_klass(MutableCallSite_klass, java_lang_invoke_MutableCallSite, Pre_JSR292 ) \
164 164 do_klass(VolatileCallSite_klass, java_lang_invoke_VolatileCallSite, Pre_JSR292 ) \
165 165 /* Note: MethodHandle must be first, and VolatileCallSite last in group */ \
166 166 \
167 167 do_klass(StringBuffer_klass, java_lang_StringBuffer, Pre ) \
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168 168 do_klass(StringBuilder_klass, java_lang_StringBuilder, Pre ) \
169 169 do_klass(misc_Unsafe_klass, sun_misc_Unsafe, Pre ) \
170 170 \
171 171 /* support for CDS */ \
172 172 do_klass(ByteArrayInputStream_klass, java_io_ByteArrayInputStream, Pre ) \
173 173 do_klass(File_klass, java_io_File, Pre ) \
174 174 do_klass(URLClassLoader_klass, java_net_URLClassLoader, Pre ) \
175 175 do_klass(URL_klass, java_net_URL, Pre ) \
176 176 do_klass(Jar_Manifest_klass, java_util_jar_Manifest, Pre ) \
177 177 do_klass(sun_misc_Launcher_klass, sun_misc_Launcher, Pre ) \
178 + do_klass(sun_misc_Launcher_AppClassLoader_klass, sun_misc_Launcher_AppClassLoader, Pre ) \
179 + do_klass(sun_misc_Launcher_ExtClassLoader_klass, sun_misc_Launcher_ExtClassLoader, Pre ) \
178 180 do_klass(CodeSource_klass, java_security_CodeSource, Pre ) \
179 181 \
180 182 /* It's NULL in non-1.4 JDKs. */ \
181 183 do_klass(StackTraceElement_klass, java_lang_StackTraceElement, Opt ) \
182 184 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
183 185 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
184 186 do_klass(nio_Buffer_klass, java_nio_Buffer, Opt ) \
185 187 \
186 188 /* Preload boxing klasses */ \
187 189 do_klass(Boolean_klass, java_lang_Boolean, Pre ) \
188 190 do_klass(Character_klass, java_lang_Character, Pre ) \
189 191 do_klass(Float_klass, java_lang_Float, Pre ) \
190 192 do_klass(Double_klass, java_lang_Double, Pre ) \
191 193 do_klass(Byte_klass, java_lang_Byte, Pre ) \
192 194 do_klass(Short_klass, java_lang_Short, Pre ) \
193 195 do_klass(Integer_klass, java_lang_Integer, Pre ) \
194 196 do_klass(Long_klass, java_lang_Long, Pre ) \
195 197 /*end*/
196 198
197 199
198 200 class SystemDictionary : AllStatic {
199 201 friend class VMStructs;
200 202 friend class SystemDictionaryHandles;
201 203
202 204 public:
203 205 enum WKID {
204 206 NO_WKID = 0,
205 207
206 208 #define WK_KLASS_ENUM(name, symbol, ignore_o) WK_KLASS_ENUM_NAME(name), WK_KLASS_ENUM_NAME(symbol) = WK_KLASS_ENUM_NAME(name),
207 209 WK_KLASSES_DO(WK_KLASS_ENUM)
208 210 #undef WK_KLASS_ENUM
209 211
210 212 WKID_LIMIT,
211 213
212 214 FIRST_WKID = NO_WKID + 1
213 215 };
214 216
215 217 enum InitOption {
216 218 Pre, // preloaded; error if not present
217 219 Pre_JSR292, // preloaded if EnableInvokeDynamic
218 220
219 221 // Order is significant. Options before this point require resolve_or_fail.
220 222 // Options after this point will use resolve_or_null instead.
221 223
222 224 Opt, // preload tried; NULL if not present
223 225 Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection
224 226 Opt_Only_JDK15, // preload tried; use only with JDK1.5+
225 227 OPTION_LIMIT,
226 228 CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT)
227 229 };
228 230
229 231
230 232 // Returns a class with a given class name and class loader. Loads the
231 233 // class if needed. If not found a NoClassDefFoundError or a
232 234 // ClassNotFoundException is thrown, depending on the value on the
233 235 // throw_error flag. For most uses the throw_error argument should be set
234 236 // to true.
235 237
236 238 static Klass* resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS);
237 239 // Convenient call for null loader and protection domain.
238 240 static Klass* resolve_or_fail(Symbol* class_name, bool throw_error, TRAPS);
239 241 protected:
240 242 // handle error translation for resolve_or_null results
241 243 static Klass* handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS);
242 244
243 245 public:
244 246
245 247 // Returns a class with a given class name and class loader.
246 248 // Loads the class if needed. If not found NULL is returned.
247 249 static Klass* resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
248 250 // Version with null loader and protection domain
249 251 static Klass* resolve_or_null(Symbol* class_name, TRAPS);
250 252
251 253 // Resolve a superclass or superinterface. Called from ClassFileParser,
252 254 // parse_interfaces, resolve_instance_class_or_null, load_shared_class
253 255 // "child_name" is the class whose super class or interface is being resolved.
254 256 static Klass* resolve_super_or_fail(Symbol* child_name,
255 257 Symbol* class_name,
256 258 Handle class_loader,
257 259 Handle protection_domain,
258 260 bool is_superclass,
259 261 TRAPS);
260 262
261 263 // Parse new stream. This won't update the system dictionary or
262 264 // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses.
263 265 static Klass* parse_stream(Symbol* class_name,
264 266 Handle class_loader,
265 267 Handle protection_domain,
266 268 ClassFileStream* st,
267 269 TRAPS) {
268 270 KlassHandle nullHandle;
269 271 return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD);
270 272 }
271 273 static Klass* parse_stream(Symbol* class_name,
272 274 Handle class_loader,
273 275 Handle protection_domain,
274 276 ClassFileStream* st,
275 277 KlassHandle host_klass,
276 278 GrowableArray<Handle>* cp_patches,
277 279 TRAPS);
278 280
279 281 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass)
280 282 static Klass* resolve_from_stream(Symbol* class_name, Handle class_loader,
281 283 Handle protection_domain,
282 284 ClassFileStream* st, bool verify, TRAPS);
283 285
284 286 // Lookup an already loaded class. If not found NULL is returned.
285 287 static Klass* find(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
286 288
287 289 // Lookup an already loaded instance or array class.
288 290 // Do not make any queries to class loaders; consult only the cache.
289 291 // If not found NULL is returned.
290 292 static Klass* find_instance_or_array_klass(Symbol* class_name,
291 293 Handle class_loader,
292 294 Handle protection_domain,
293 295 TRAPS);
294 296
295 297 // Lookup an instance or array class that has already been loaded
296 298 // either into the given class loader, or else into another class
297 299 // loader that is constrained (via loader constraints) to produce
298 300 // a consistent class. Do not take protection domains into account.
299 301 // Do not make any queries to class loaders; consult only the cache.
300 302 // Return NULL if the class is not found.
301 303 //
302 304 // This function is a strict superset of find_instance_or_array_klass.
303 305 // This function (the unchecked version) makes a conservative prediction
304 306 // of the result of the checked version, assuming successful lookup.
305 307 // If both functions return non-null, they must return the same value.
306 308 // Also, the unchecked version may sometimes be non-null where the
307 309 // checked version is null. This can occur in several ways:
308 310 // 1. No query has yet been made to the class loader.
309 311 // 2. The class loader was queried, but chose not to delegate.
310 312 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain.
311 313 // 4. Loading was attempted, but there was a linkage error of some sort.
312 314 // In all of these cases, the loader constraints on this type are
313 315 // satisfied, and it is safe for classes in the given class loader
314 316 // to manipulate strongly-typed values of the found class, subject
315 317 // to local linkage and access checks.
316 318 static Klass* find_constrained_instance_or_array_klass(Symbol* class_name,
317 319 Handle class_loader,
318 320 TRAPS);
319 321
320 322 // Iterate over all klasses in dictionary
321 323 // Just the classes from defining class loaders
322 324 static void classes_do(void f(Klass*));
323 325 // Added for initialize_itable_for_klass to handle exceptions
324 326 static void classes_do(void f(Klass*, TRAPS), TRAPS);
325 327 // All classes, and their class loaders
326 328 static void classes_do(void f(Klass*, ClassLoaderData*));
327 329
328 330 static void placeholders_do(void f(Symbol*));
329 331
330 332 // Iterate over all methods in all klasses in dictionary
331 333 static void methods_do(void f(Method*));
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332 334
333 335 // Garbage collection support
334 336
335 337 // This method applies "blk->do_oop" to all the pointers to "system"
336 338 // classes and loaders.
337 339 static void always_strong_oops_do(OopClosure* blk);
338 340 static void always_strong_classes_do(KlassClosure* closure);
339 341
340 342 // Unload (that is, break root links to) all unmarked classes and
341 343 // loaders. Returns "true" iff something was unloaded.
342 - static bool do_unloading(BoolObjectClosure* is_alive);
344 + static bool do_unloading(BoolObjectClosure* is_alive, bool clean_alive = true);
343 345
344 346 // Used by DumpSharedSpaces only to remove classes that failed verification
345 347 static void remove_classes_in_error_state();
346 348
347 349 static int calculate_systemdictionary_size(int loadedclasses);
348 350
349 351 // Applies "f->do_oop" to all root oops in the system dictionary.
350 352 static void oops_do(OopClosure* f);
351 353 static void roots_oops_do(OopClosure* strong, OopClosure* weak);
352 354
353 355 // System loader lock
354 356 static oop system_loader_lock() { return _system_loader_lock_obj; }
355 357
356 358 protected:
357 359 // Extended Redefine classes support (tbi)
358 360 static void preloaded_classes_do(KlassClosure* f);
359 361 static void lazily_loaded_classes_do(KlassClosure* f);
360 362 public:
361 363 // Sharing support.
362 364 static void reorder_dictionary();
363 365 static void copy_buckets(char** top, char* end);
364 366 static void copy_table(char** top, char* end);
365 367 static void reverse();
366 368 static void set_shared_dictionary(HashtableBucket<mtClass>* t, int length,
367 369 int number_of_entries);
368 370 // Printing
369 371 static void print(bool details = true);
370 372 static void print_shared(bool details = true);
371 373 static void print_class_statistics() PRODUCT_RETURN;
372 374 static void print_method_statistics() PRODUCT_RETURN;
373 375
374 376 // Number of contained klasses
375 377 // This is both fully loaded classes and classes in the process
376 378 // of being loaded
377 379 static int number_of_classes();
378 380
379 381 // Monotonically increasing counter which grows as classes are
380 382 // loaded or modifications such as hot-swapping or setting/removing
381 383 // of breakpoints are performed
382 384 static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; }
383 385 // Needed by evolution and breakpoint code
384 386 static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; }
385 387
386 388 // Verification
387 389 static void verify();
388 390
389 391 #ifdef ASSERT
390 392 static bool is_internal_format(Symbol* class_name);
391 393 #endif
392 394
393 395 // Initialization
394 396 static void initialize(TRAPS);
395 397
396 398 // Fast access to commonly used classes (preloaded)
397 399 static Klass* check_klass(Klass* k) {
398 400 assert(k != NULL, "preloaded klass not initialized");
399 401 return k;
400 402 }
401 403
402 404 static Klass* check_klass_Pre( Klass* k) { return check_klass(k); }
403 405 static Klass* check_klass_Pre_JSR292(Klass* k) { return EnableInvokeDynamic ? check_klass(k) : k; }
404 406 static Klass* check_klass_Opt( Klass* k) { return k; }
405 407 static Klass* check_klass_Opt_Only_JDK15(Klass* k) {
406 408 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only");
407 409 return k;
408 410 }
409 411 static Klass* check_klass_Opt_Only_JDK14NewRef(Klass* k) {
410 412 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only");
411 413 // despite the optional loading, if you use this it must be present:
412 414 return check_klass(k);
413 415 }
414 416
415 417 static bool initialize_wk_klass(WKID id, int init_opt, TRAPS);
416 418 static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS);
417 419 static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) {
418 420 int limit = (int)end_id + 1;
419 421 initialize_wk_klasses_until((WKID) limit, start_id, THREAD);
420 422 }
421 423
422 424 public:
423 425 #define WK_KLASS_DECLARE(name, symbol, option) \
424 426 static Klass* name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } \
425 427 static Klass** name##_addr() { \
426 428 return &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \
427 429 }
428 430 WK_KLASSES_DO(WK_KLASS_DECLARE);
429 431 #undef WK_KLASS_DECLARE
430 432
431 433 static Klass* well_known_klass(WKID id) {
432 434 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob");
433 435 return _well_known_klasses[id];
434 436 }
435 437
436 438 static Klass** well_known_klass_addr(WKID id) {
437 439 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob");
438 440 return &_well_known_klasses[id];
439 441 }
440 442
441 443 // Local definition for direct access to the private array:
442 444 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]
443 445
444 446 static Klass* box_klass(BasicType t) {
445 447 assert((uint)t < T_VOID+1, "range check");
446 448 return check_klass(_box_klasses[t]);
447 449 }
448 450 static BasicType box_klass_type(Klass* k); // inverse of box_klass
449 451
450 452 // methods returning lazily loaded klasses
451 453 // The corresponding method to load the class must be called before calling them.
452 454 static Klass* abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); }
453 455
454 456 static void load_abstract_ownable_synchronizer_klass(TRAPS);
455 457
456 458 protected:
457 459 // Tells whether ClassLoader.loadClassInternal is present
458 460 static bool has_loadClassInternal() { return _has_loadClassInternal; }
459 461
460 462 // Returns the class loader data to be used when looking up/updating the
461 463 // system dictionary.
462 464 static ClassLoaderData *class_loader_data(Handle class_loader) {
463 465 return ClassLoaderData::class_loader_data(class_loader());
464 466 }
465 467
466 468 public:
467 469 // Tells whether ClassLoader.checkPackageAccess is present
468 470 static bool has_checkPackageAccess() { return _has_checkPackageAccess; }
469 471
470 472 static bool Parameter_klass_loaded() { return WK_KLASS(reflect_Parameter_klass) != NULL; }
471 473 static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; }
472 474 static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; }
473 475 static bool Object_klass_loaded() { return WK_KLASS(Object_klass) != NULL; }
474 476 static bool ClassLoader_klass_loaded() { return WK_KLASS(ClassLoader_klass) != NULL; }
475 477
476 478 // Returns default system loader
477 479 static oop java_system_loader();
478 480
479 481 // Compute the default system loader
480 482 static void compute_java_system_loader(TRAPS);
481 483
482 484 // Register a new class loader
483 485 static ClassLoaderData* register_loader(Handle class_loader, TRAPS);
484 486 protected:
485 487 // Mirrors for primitive classes (created eagerly)
486 488 static oop check_mirror(oop m) {
487 489 assert(m != NULL, "mirror not initialized");
488 490 return m;
489 491 }
490 492
491 493 public:
492 494 // Note: java_lang_Class::primitive_type is the inverse of java_mirror
493 495
494 496 // Check class loader constraints
495 497 static bool add_loader_constraint(Symbol* name, Handle loader1,
496 498 Handle loader2, TRAPS);
497 499 static Symbol* check_signature_loaders(Symbol* signature, Handle loader1,
498 500 Handle loader2, bool is_method, TRAPS);
499 501
500 502 // JSR 292
501 503 // find a java.lang.invoke.MethodHandle.invoke* method for a given signature
502 504 // (asks Java to compute it if necessary, except in a compiler thread)
503 505 static methodHandle find_method_handle_invoker(Symbol* name,
504 506 Symbol* signature,
505 507 KlassHandle accessing_klass,
506 508 Handle *appendix_result,
507 509 Handle *method_type_result,
508 510 TRAPS);
509 511 // for a given signature, find the internal MethodHandle method (linkTo* or invokeBasic)
510 512 // (does not ask Java, since this is a low-level intrinsic defined by the JVM)
511 513 static methodHandle find_method_handle_intrinsic(vmIntrinsics::ID iid,
512 514 Symbol* signature,
513 515 TRAPS);
514 516 // find a java.lang.invoke.MethodType object for a given signature
515 517 // (asks Java to compute it if necessary, except in a compiler thread)
516 518 static Handle find_method_handle_type(Symbol* signature,
517 519 KlassHandle accessing_klass,
518 520 TRAPS);
519 521
520 522 // ask Java to compute a java.lang.invoke.MethodHandle object for a given CP entry
521 523 static Handle link_method_handle_constant(KlassHandle caller,
522 524 int ref_kind, //e.g., JVM_REF_invokeVirtual
523 525 KlassHandle callee,
524 526 Symbol* name,
525 527 Symbol* signature,
526 528 TRAPS);
527 529
528 530 // ask Java to create a dynamic call site, while linking an invokedynamic op
529 531 static methodHandle find_dynamic_call_site_invoker(KlassHandle caller,
530 532 Handle bootstrap_method,
531 533 Symbol* name,
532 534 Symbol* type,
533 535 Handle *appendix_result,
534 536 Handle *method_type_result,
535 537 TRAPS);
536 538
537 539 // Utility for printing loader "name" as part of tracing constraints
538 540 static const char* loader_name(oop loader) {
539 541 return ((loader) == NULL ? "<bootloader>" :
540 542 InstanceKlass::cast((loader)->klass())->name()->as_C_string() );
541 543 }
542 544 static const char* loader_name(ClassLoaderData* loader_data) {
543 545 return (loader_data->class_loader() == NULL ? "<bootloader>" :
544 546 InstanceKlass::cast((loader_data->class_loader())->klass())->name()->as_C_string() );
545 547 }
546 548
547 549 // Record the error when the first attempt to resolve a reference from a constant
548 550 // pool entry to a class fails.
549 551 static void add_resolution_error(constantPoolHandle pool, int which, Symbol* error);
550 552 static void delete_resolution_error(ConstantPool* pool);
551 553 static Symbol* find_resolution_error(constantPoolHandle pool, int which);
552 554
553 555 protected:
554 556
555 557 enum Constants {
556 558 _loader_constraint_size = 107, // number of entries in constraint table
557 559 _resolution_error_size = 107, // number of entries in resolution error table
558 560 _invoke_method_size = 139, // number of entries in invoke method table
559 561 _nof_buckets = 1009, // number of buckets in hash table for placeholders
560 562 _old_default_sdsize = 1009, // backward compat for system dictionary size
561 563 _prime_array_size = 8, // array of primes for system dictionary size
562 564 _average_depth_goal = 3 // goal for lookup length
563 565 };
564 566
565 567
566 568 // Static variables
567 569
568 570 // hashtable sizes for system dictionary to allow growth
569 571 // prime numbers for system dictionary size
570 572 static int _sdgeneration;
571 573 static const int _primelist[_prime_array_size];
572 574
573 575 // Hashtable holding loaded classes.
574 576 static Dictionary* _dictionary;
575 577
576 578 // Hashtable holding placeholders for classes being loaded.
577 579 static PlaceholderTable* _placeholders;
578 580
579 581 // Hashtable holding classes from the shared archive.
580 582 static Dictionary* _shared_dictionary;
581 583
582 584 // Monotonically increasing counter which grows with
583 585 // _number_of_classes as well as hot-swapping and breakpoint setting
584 586 // and removal.
585 587 static int _number_of_modifications;
586 588
587 589 // Lock object for system class loader
588 590 static oop _system_loader_lock_obj;
589 591
590 592 // Constraints on class loaders
591 593 static LoaderConstraintTable* _loader_constraints;
592 594
593 595 // Resolution errors
594 596 static ResolutionErrorTable* _resolution_errors;
595 597
596 598 // Invoke methods (JSR 292)
597 599 static SymbolPropertyTable* _invoke_method_table;
598 600
599 601 public:
600 602 // for VM_CounterDecay iteration support
601 603 friend class CounterDecay;
602 604 static Klass* try_get_next_class();
603 605
604 606 protected:
605 607 static void validate_protection_domain(instanceKlassHandle klass,
606 608 Handle class_loader,
607 609 Handle protection_domain, TRAPS);
608 610
609 611 friend class VM_PopulateDumpSharedSpace;
610 612 friend class TraversePlaceholdersClosure;
611 613 static Dictionary* dictionary() { return _dictionary; }
612 614 static Dictionary* shared_dictionary() { return _shared_dictionary; }
613 615 static PlaceholderTable* placeholders() { return _placeholders; }
614 616 static LoaderConstraintTable* constraints() { return _loader_constraints; }
615 617 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; }
616 618 static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; }
617 619
618 620 // Basic loading operations
619 621 static Klass* resolve_instance_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
620 622 static Klass* resolve_array_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
621 623 static instanceKlassHandle handle_parallel_super_load(Symbol* class_name, Symbol* supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS);
622 624 // Wait on SystemDictionary_lock; unlocks lockObject before
623 625 // waiting; relocks lockObject with correct recursion count
624 626 // after waiting, but before reentering SystemDictionary_lock
625 627 // to preserve lock order semantics.
626 628 static void double_lock_wait(Handle lockObject, TRAPS);
627 629 static void define_instance_class(instanceKlassHandle k, TRAPS);
628 630 static instanceKlassHandle find_or_define_instance_class(Symbol* class_name,
629 631 Handle class_loader,
630 632 instanceKlassHandle k, TRAPS);
631 633 static instanceKlassHandle load_shared_class(instanceKlassHandle ik,
632 634 Handle class_loader,
633 635 Handle protection_domain,
634 636 TRAPS);
635 637 static instanceKlassHandle load_instance_class(Symbol* class_name, Handle class_loader, TRAPS);
636 638 static Handle compute_loader_lock_object(Handle class_loader, TRAPS);
637 639 static void check_loader_lock_contention(Handle loader_lock, TRAPS);
638 640 static bool is_parallelCapable(Handle class_loader);
639 641 static bool is_parallelDefine(Handle class_loader);
640 642
641 643 public:
642 644 static instanceKlassHandle load_shared_class(Symbol* class_name,
643 645 Handle class_loader,
644 646 TRAPS);
645 647 static bool is_ext_class_loader(Handle class_loader);
646 648
647 649 protected:
648 650 static Klass* find_shared_class(Symbol* class_name);
649 651
650 652 // Setup link to hierarchy
651 653 static void add_to_hierarchy(instanceKlassHandle k, TRAPS);
652 654
653 655 // event based tracing
654 656 static void post_class_load_event(const Ticks& start_time, instanceKlassHandle k,
655 657 Handle initiating_loader);
656 658 // We pass in the hashtable index so we can calculate it outside of
657 659 // the SystemDictionary_lock.
658 660
659 661 // Basic find on loaded classes
660 662 static Klass* find_class(int index, unsigned int hash,
661 663 Symbol* name, ClassLoaderData* loader_data);
662 664 static Klass* find_class(Symbol* class_name, ClassLoaderData* loader_data);
663 665
664 666 // Basic find on classes in the midst of being loaded
665 667 static Symbol* find_placeholder(Symbol* name, ClassLoaderData* loader_data);
666 668
667 669 // Updating entry in dictionary
668 670 // Add a completely loaded class
669 671 static void add_klass(int index, Symbol* class_name,
670 672 ClassLoaderData* loader_data, KlassHandle obj);
671 673
672 674 // Add a placeholder for a class being loaded
673 675 static void add_placeholder(int index,
674 676 Symbol* class_name,
675 677 ClassLoaderData* loader_data);
676 678 static void remove_placeholder(int index,
677 679 Symbol* class_name,
678 680 ClassLoaderData* loader_data);
679 681
680 682 // Performs cleanups after resolve_super_or_fail. This typically needs
681 683 // to be called on failure.
682 684 // Won't throw, but can block.
683 685 static void resolution_cleanups(Symbol* class_name,
684 686 ClassLoaderData* loader_data,
685 687 TRAPS);
686 688
687 689 // Initialization
688 690 static void initialize_preloaded_classes(TRAPS);
689 691
690 692 // Class loader constraints
691 693 static void check_constraints(int index, unsigned int hash,
692 694 instanceKlassHandle k, Handle loader,
693 695 bool defining, TRAPS);
694 696 static void update_dictionary(int d_index, unsigned int d_hash,
695 697 int p_index, unsigned int p_hash,
696 698 instanceKlassHandle k, Handle loader,
697 699 TRAPS);
698 700
699 701 // Variables holding commonly used klasses (preloaded)
700 702 static Klass* _well_known_klasses[];
701 703
702 704 // Lazily loaded klasses
703 705 static Klass* volatile _abstract_ownable_synchronizer_klass;
704 706
705 707 // table of box klasses (int_klass, etc.)
706 708 static Klass* _box_klasses[T_VOID+1];
707 709
708 710 static oop _java_system_loader;
709 711
710 712 static bool _has_loadClassInternal;
711 713 static bool _has_checkPackageAccess;
712 714 };
713 715
714 716 #endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP
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