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rev 1081 : imported patch indy-cleanup-6893081.patch
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--- old/src/share/vm/classfile/systemDictionary.hpp
+++ new/src/share/vm/classfile/systemDictionary.hpp
1 1 /*
2 2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 21 * have any questions.
22 22 *
23 23 */
24 24
25 25 // The system dictionary stores all loaded classes and maps:
26 26 //
27 27 // [class name,class loader] -> class i.e. [symbolOop,oop] -> klassOop
28 28 //
29 29 // Classes are loaded lazily. The default VM class loader is
30 30 // represented as NULL.
31 31
32 32 // The underlying data structure is an open hash table with a fixed number
33 33 // of buckets. During loading the loader object is locked, (for the VM loader
34 34 // a private lock object is used). Class loading can thus be done concurrently,
35 35 // but only by different loaders.
36 36 //
37 37 // During loading a placeholder (name, loader) is temporarily placed in
38 38 // a side data structure, and is used to detect ClassCircularityErrors
39 39 // and to perform verification during GC. A GC can occur in the midst
40 40 // of class loading, as we call out to Java, have to take locks, etc.
41 41 //
42 42 // When class loading is finished, a new entry is added to the system
43 43 // dictionary and the place holder is removed. Note that the protection
44 44 // domain field of the system dictionary has not yet been filled in when
45 45 // the "real" system dictionary entry is created.
46 46 //
47 47 // Clients of this class who are interested in finding if a class has
48 48 // been completely loaded -- not classes in the process of being loaded --
49 49 // can read the SystemDictionary unlocked. This is safe because
50 50 // - entries are only deleted at safepoints
51 51 // - readers cannot come to a safepoint while actively examining
52 52 // an entry (an entry cannot be deleted from under a reader)
53 53 // - entries must be fully formed before they are available to concurrent
54 54 // readers (we must ensure write ordering)
55 55 //
56 56 // Note that placeholders are deleted at any time, as they are removed
57 57 // when a class is completely loaded. Therefore, readers as well as writers
58 58 // of placeholders must hold the SystemDictionary_lock.
59 59 //
60 60
61 61 class Dictionary;
62 62 class PlaceholderTable;
63 63 class LoaderConstraintTable;
64 64 class HashtableBucket;
65 65 class ResolutionErrorTable;
66 66 class SymbolPropertyTable;
67 67
68 68 // Certain classes are preloaded, such as java.lang.Object and java.lang.String.
69 69 // They are all "well-known", in the sense that no class loader is allowed
70 70 // to provide a different definition.
71 71 //
72 72 // These klasses must all have names defined in vmSymbols.
73 73
74 74 #define WK_KLASS_ENUM_NAME(kname) kname##_knum
75 75
76 76 // Each well-known class has a short klass name (like object_klass),
77 77 // a vmSymbol name (like java_lang_Object), and a flag word
78 78 // that makes some minor distinctions, like whether the klass
79 79 // is preloaded, optional, release-specific, etc.
80 80 // The order of these definitions is significant; it is the order in which
81 81 // preloading is actually performed by initialize_preloaded_classes.
82 82
83 83 #define WK_KLASSES_DO(template) \
84 84 /* well-known classes */ \
85 85 template(object_klass, java_lang_Object, Pre) \
86 86 template(string_klass, java_lang_String, Pre) \
87 87 template(class_klass, java_lang_Class, Pre) \
88 88 template(cloneable_klass, java_lang_Cloneable, Pre) \
89 89 template(classloader_klass, java_lang_ClassLoader, Pre) \
90 90 template(serializable_klass, java_io_Serializable, Pre) \
91 91 template(system_klass, java_lang_System, Pre) \
92 92 template(throwable_klass, java_lang_Throwable, Pre) \
93 93 template(error_klass, java_lang_Error, Pre) \
94 94 template(threaddeath_klass, java_lang_ThreadDeath, Pre) \
95 95 template(exception_klass, java_lang_Exception, Pre) \
96 96 template(runtime_exception_klass, java_lang_RuntimeException, Pre) \
97 97 template(protectionDomain_klass, java_security_ProtectionDomain, Pre) \
98 98 template(AccessControlContext_klass, java_security_AccessControlContext, Pre) \
99 99 template(classNotFoundException_klass, java_lang_ClassNotFoundException, Pre) \
100 100 template(noClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre) \
101 101 template(linkageError_klass, java_lang_LinkageError, Pre) \
102 102 template(ClassCastException_klass, java_lang_ClassCastException, Pre) \
103 103 template(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre) \
104 104 template(virtualMachineError_klass, java_lang_VirtualMachineError, Pre) \
105 105 template(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre) \
106 106 template(StackOverflowError_klass, java_lang_StackOverflowError, Pre) \
107 107 template(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre) \
108 108 template(reference_klass, java_lang_ref_Reference, Pre) \
109 109 \
110 110 /* Preload ref klasses and set reference types */ \
111 111 template(soft_reference_klass, java_lang_ref_SoftReference, Pre) \
112 112 template(weak_reference_klass, java_lang_ref_WeakReference, Pre) \
113 113 template(final_reference_klass, java_lang_ref_FinalReference, Pre) \
114 114 template(phantom_reference_klass, java_lang_ref_PhantomReference, Pre) \
115 115 template(finalizer_klass, java_lang_ref_Finalizer, Pre) \
116 116 \
117 117 template(thread_klass, java_lang_Thread, Pre) \
118 118 template(threadGroup_klass, java_lang_ThreadGroup, Pre) \
119 119 template(properties_klass, java_util_Properties, Pre) \
120 120 template(reflect_accessible_object_klass, java_lang_reflect_AccessibleObject, Pre) \
121 121 template(reflect_field_klass, java_lang_reflect_Field, Pre) \
122 122 template(reflect_method_klass, java_lang_reflect_Method, Pre) \
123 123 template(reflect_constructor_klass, java_lang_reflect_Constructor, Pre) \
124 124 \
125 125 /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \
126 126 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
127 127 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
128 128 template(reflect_magic_klass, sun_reflect_MagicAccessorImpl, Opt) \
129 129 template(reflect_method_accessor_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \
130 130 template(reflect_constructor_accessor_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \
131 131 template(reflect_delegating_classloader_klass, sun_reflect_DelegatingClassLoader, Opt) \
132 132 template(reflect_constant_pool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15) \
133 133 template(reflect_unsafe_static_field_accessor_impl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15) \
134 134 \
135 135 /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \
136 136 template(MethodHandle_klass, java_dyn_MethodHandle, Opt) \
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137 137 template(MemberName_klass, sun_dyn_MemberName, Opt) \
138 138 template(MethodHandleImpl_klass, sun_dyn_MethodHandleImpl, Opt) \
139 139 template(AdapterMethodHandle_klass, sun_dyn_AdapterMethodHandle, Opt) \
140 140 template(BoundMethodHandle_klass, sun_dyn_BoundMethodHandle, Opt) \
141 141 template(DirectMethodHandle_klass, sun_dyn_DirectMethodHandle, Opt) \
142 142 template(MethodType_klass, java_dyn_MethodType, Opt) \
143 143 template(MethodTypeForm_klass, java_dyn_MethodTypeForm, Opt) \
144 144 template(WrongMethodTypeException_klass, java_dyn_WrongMethodTypeException, Opt) \
145 145 template(Linkage_klass, java_dyn_Linkage, Opt) \
146 146 template(CallSite_klass, java_dyn_CallSite, Opt) \
147 - template(Dynamic_klass, java_dyn_Dynamic, Opt) \
147 + template(InvokeDynamic_klass, java_dyn_InvokeDynamic, Opt) \
148 148 /* Note: MethodHandle must be first, and Dynamic last in group */ \
149 149 \
150 150 template(vector_klass, java_util_Vector, Pre) \
151 151 template(hashtable_klass, java_util_Hashtable, Pre) \
152 152 template(stringBuffer_klass, java_lang_StringBuffer, Pre) \
153 153 template(StringBuilder_klass, java_lang_StringBuilder, Pre) \
154 154 \
155 155 /* It's NULL in non-1.4 JDKs. */ \
156 156 template(stackTraceElement_klass, java_lang_StackTraceElement, Opt) \
157 157 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
158 158 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
159 159 template(java_nio_Buffer_klass, java_nio_Buffer, Opt) \
160 160 \
161 161 /* If this class isn't present, it won't be referenced. */ \
162 162 template(sun_misc_AtomicLongCSImpl_klass, sun_misc_AtomicLongCSImpl, Opt) \
163 163 \
164 164 template(sun_jkernel_DownloadManager_klass, sun_jkernel_DownloadManager, Opt_Kernel) \
165 165 \
166 166 /* Preload boxing klasses */ \
167 167 template(boolean_klass, java_lang_Boolean, Pre) \
168 168 template(char_klass, java_lang_Character, Pre) \
169 169 template(float_klass, java_lang_Float, Pre) \
170 170 template(double_klass, java_lang_Double, Pre) \
171 171 template(byte_klass, java_lang_Byte, Pre) \
172 172 template(short_klass, java_lang_Short, Pre) \
173 173 template(int_klass, java_lang_Integer, Pre) \
174 174 template(long_klass, java_lang_Long, Pre) \
175 175 /*end*/
176 176
177 177
178 178 class SystemDictionary : AllStatic {
179 179 friend class VMStructs;
180 180 friend class CompactingPermGenGen;
181 181 friend class SystemDictionaryHandles;
182 182 NOT_PRODUCT(friend class instanceKlassKlass;)
183 183
184 184 public:
185 185 enum WKID {
186 186 NO_WKID = 0,
187 187
188 188 #define WK_KLASS_ENUM(name, ignore_s, ignore_o) WK_KLASS_ENUM_NAME(name),
189 189 WK_KLASSES_DO(WK_KLASS_ENUM)
190 190 #undef WK_KLASS_ENUM
191 191
192 192 WKID_LIMIT,
193 193
194 194 FIRST_WKID = NO_WKID + 1
195 195 };
196 196
197 197 enum InitOption {
198 198 Pre, // preloaded; error if not present
199 199
200 200 // Order is significant. Options before this point require resolve_or_fail.
201 201 // Options after this point will use resolve_or_null instead.
202 202
203 203 Opt, // preload tried; NULL if not present
204 204 Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection
205 205 Opt_Only_JDK15, // preload tried; use only with JDK1.5+
206 206 Opt_Kernel, // preload tried only #ifdef KERNEL
207 207 OPTION_LIMIT,
208 208 CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT)
209 209 };
210 210
211 211
212 212 // Returns a class with a given class name and class loader. Loads the
213 213 // class if needed. If not found a NoClassDefFoundError or a
214 214 // ClassNotFoundException is thrown, depending on the value on the
215 215 // throw_error flag. For most uses the throw_error argument should be set
216 216 // to true.
217 217
218 218 static klassOop resolve_or_fail(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS);
219 219 // Convenient call for null loader and protection domain.
220 220 static klassOop resolve_or_fail(symbolHandle class_name, bool throw_error, TRAPS);
221 221 private:
222 222 // handle error translation for resolve_or_null results
223 223 static klassOop handle_resolution_exception(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS);
224 224
225 225 public:
226 226
227 227 // Returns a class with a given class name and class loader.
228 228 // Loads the class if needed. If not found NULL is returned.
229 229 static klassOop resolve_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS);
230 230 // Version with null loader and protection domain
231 231 static klassOop resolve_or_null(symbolHandle class_name, TRAPS);
232 232
233 233 // Resolve a superclass or superinterface. Called from ClassFileParser,
234 234 // parse_interfaces, resolve_instance_class_or_null, load_shared_class
235 235 // "child_name" is the class whose super class or interface is being resolved.
236 236 static klassOop resolve_super_or_fail(symbolHandle child_name,
237 237 symbolHandle class_name,
238 238 Handle class_loader,
239 239 Handle protection_domain,
240 240 bool is_superclass,
241 241 TRAPS);
242 242
243 243 // Parse new stream. This won't update the system dictionary or
244 244 // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses.
245 245 static klassOop parse_stream(symbolHandle class_name,
246 246 Handle class_loader,
247 247 Handle protection_domain,
248 248 ClassFileStream* st,
249 249 TRAPS) {
250 250 KlassHandle nullHandle;
251 251 return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD);
252 252 }
253 253 static klassOop parse_stream(symbolHandle class_name,
254 254 Handle class_loader,
255 255 Handle protection_domain,
256 256 ClassFileStream* st,
257 257 KlassHandle host_klass,
258 258 GrowableArray<Handle>* cp_patches,
259 259 TRAPS);
260 260
261 261 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass)
262 262 static klassOop resolve_from_stream(symbolHandle class_name, Handle class_loader,
263 263 Handle protection_domain,
264 264 ClassFileStream* st, bool verify, TRAPS);
265 265
266 266 // Lookup an already loaded class. If not found NULL is returned.
267 267 static klassOop find(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS);
268 268
269 269 // Lookup an already loaded instance or array class.
270 270 // Do not make any queries to class loaders; consult only the cache.
271 271 // If not found NULL is returned.
272 272 static klassOop find_instance_or_array_klass(symbolHandle class_name,
273 273 Handle class_loader,
274 274 Handle protection_domain,
275 275 TRAPS);
276 276
277 277 // If the given name is known to vmSymbols, return the well-know klass:
278 278 static klassOop find_well_known_klass(symbolOop class_name);
279 279
280 280 // Lookup an instance or array class that has already been loaded
281 281 // either into the given class loader, or else into another class
282 282 // loader that is constrained (via loader constraints) to produce
283 283 // a consistent class. Do not take protection domains into account.
284 284 // Do not make any queries to class loaders; consult only the cache.
285 285 // Return NULL if the class is not found.
286 286 //
287 287 // This function is a strict superset of find_instance_or_array_klass.
288 288 // This function (the unchecked version) makes a conservative prediction
289 289 // of the result of the checked version, assuming successful lookup.
290 290 // If both functions return non-null, they must return the same value.
291 291 // Also, the unchecked version may sometimes be non-null where the
292 292 // checked version is null. This can occur in several ways:
293 293 // 1. No query has yet been made to the class loader.
294 294 // 2. The class loader was queried, but chose not to delegate.
295 295 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain.
296 296 // 4. Loading was attempted, but there was a linkage error of some sort.
297 297 // In all of these cases, the loader constraints on this type are
298 298 // satisfied, and it is safe for classes in the given class loader
299 299 // to manipulate strongly-typed values of the found class, subject
300 300 // to local linkage and access checks.
301 301 static klassOop find_constrained_instance_or_array_klass(symbolHandle class_name,
302 302 Handle class_loader,
303 303 TRAPS);
304 304
305 305 // Iterate over all klasses in dictionary
306 306 // Just the classes from defining class loaders
307 307 static void classes_do(void f(klassOop));
308 308 // Added for initialize_itable_for_klass to handle exceptions
309 309 static void classes_do(void f(klassOop, TRAPS), TRAPS);
310 310 // All classes, and their class loaders
311 311 static void classes_do(void f(klassOop, oop));
312 312 // All classes, and their class loaders
313 313 // (added for helpers that use HandleMarks and ResourceMarks)
314 314 static void classes_do(void f(klassOop, oop, TRAPS), TRAPS);
315 315 // All entries in the placeholder table and their class loaders
316 316 static void placeholders_do(void f(symbolOop, oop));
317 317
318 318 // Iterate over all methods in all klasses in dictionary
319 319 static void methods_do(void f(methodOop));
320 320
321 321 // Garbage collection support
322 322
323 323 // This method applies "blk->do_oop" to all the pointers to "system"
324 324 // classes and loaders.
325 325 static void always_strong_oops_do(OopClosure* blk);
326 326 static void always_strong_classes_do(OopClosure* blk);
327 327 // This method applies "blk->do_oop" to all the placeholders.
328 328 static void placeholders_do(OopClosure* blk);
329 329
330 330 // Unload (that is, break root links to) all unmarked classes and
331 331 // loaders. Returns "true" iff something was unloaded.
332 332 static bool do_unloading(BoolObjectClosure* is_alive);
333 333
334 334 // Applies "f->do_oop" to all root oops in the system dictionary.
335 335 static void oops_do(OopClosure* f);
336 336
337 337 // System loader lock
338 338 static oop system_loader_lock() { return _system_loader_lock_obj; }
339 339
340 340 private:
341 341 // Traverses preloaded oops: various system classes. These are
342 342 // guaranteed to be in the perm gen.
343 343 static void preloaded_oops_do(OopClosure* f);
344 344 static void lazily_loaded_oops_do(OopClosure* f);
345 345
346 346 public:
347 347 // Sharing support.
348 348 static void reorder_dictionary();
349 349 static void copy_buckets(char** top, char* end);
350 350 static void copy_table(char** top, char* end);
351 351 static void reverse();
352 352 static void set_shared_dictionary(HashtableBucket* t, int length,
353 353 int number_of_entries);
354 354 // Printing
355 355 static void print() PRODUCT_RETURN;
356 356 static void print_class_statistics() PRODUCT_RETURN;
357 357 static void print_method_statistics() PRODUCT_RETURN;
358 358
359 359 // Number of contained klasses
360 360 // This is both fully loaded classes and classes in the process
361 361 // of being loaded
362 362 static int number_of_classes();
363 363
364 364 // Monotonically increasing counter which grows as classes are
365 365 // loaded or modifications such as hot-swapping or setting/removing
366 366 // of breakpoints are performed
367 367 static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; }
368 368 // Needed by evolution and breakpoint code
369 369 static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; }
370 370
371 371 // Verification
372 372 static void verify();
373 373
374 374 #ifdef ASSERT
375 375 static bool is_internal_format(symbolHandle class_name);
376 376 #endif
377 377
378 378 // Verify class is in dictionary
379 379 static void verify_obj_klass_present(Handle obj,
380 380 symbolHandle class_name,
381 381 Handle class_loader);
382 382
383 383 // Initialization
384 384 static void initialize(TRAPS);
385 385
386 386 // Fast access to commonly used classes (preloaded)
387 387 static klassOop check_klass(klassOop k) {
388 388 assert(k != NULL, "preloaded klass not initialized");
389 389 return k;
390 390 }
391 391
392 392 static klassOop check_klass_Pre(klassOop k) { return check_klass(k); }
393 393 static klassOop check_klass_Opt(klassOop k) { return k; }
394 394 static klassOop check_klass_Opt_Kernel(klassOop k) { return k; } //== Opt
395 395 static klassOop check_klass_Opt_Only_JDK15(klassOop k) {
396 396 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only");
397 397 return k;
398 398 }
399 399 static klassOop check_klass_Opt_Only_JDK14NewRef(klassOop k) {
400 400 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only");
401 401 // despite the optional loading, if you use this it must be present:
402 402 return check_klass(k);
403 403 }
404 404
405 405 static bool initialize_wk_klass(WKID id, int init_opt, TRAPS);
406 406 static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS);
407 407 static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) {
408 408 int limit = (int)end_id + 1;
409 409 initialize_wk_klasses_until((WKID) limit, start_id, THREAD);
410 410 }
411 411
412 412 public:
413 413 #define WK_KLASS_DECLARE(name, ignore_symbol, option) \
414 414 static klassOop name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); }
415 415 WK_KLASSES_DO(WK_KLASS_DECLARE);
416 416 #undef WK_KLASS_DECLARE
417 417
418 418 // Local definition for direct access to the private array:
419 419 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]
420 420
421 421 static klassOop box_klass(BasicType t) {
422 422 assert((uint)t < T_VOID+1, "range check");
423 423 return check_klass(_box_klasses[t]);
424 424 }
425 425 static BasicType box_klass_type(klassOop k); // inverse of box_klass
426 426
427 427 // methods returning lazily loaded klasses
428 428 // The corresponding method to load the class must be called before calling them.
429 429 static klassOop abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); }
430 430
431 431 static void load_abstract_ownable_synchronizer_klass(TRAPS);
432 432
433 433 private:
434 434 // Tells whether ClassLoader.loadClassInternal is present
435 435 static bool has_loadClassInternal() { return _has_loadClassInternal; }
436 436
437 437 public:
438 438 // Tells whether ClassLoader.checkPackageAccess is present
439 439 static bool has_checkPackageAccess() { return _has_checkPackageAccess; }
440 440
441 441 static bool class_klass_loaded() { return WK_KLASS(class_klass) != NULL; }
442 442 static bool cloneable_klass_loaded() { return WK_KLASS(cloneable_klass) != NULL; }
443 443
444 444 // Returns default system loader
445 445 static oop java_system_loader();
446 446
447 447 // Compute the default system loader
448 448 static void compute_java_system_loader(TRAPS);
449 449
450 450 private:
451 451 // Mirrors for primitive classes (created eagerly)
452 452 static oop check_mirror(oop m) {
453 453 assert(m != NULL, "mirror not initialized");
454 454 return m;
455 455 }
456 456
457 457 public:
458 458 // Note: java_lang_Class::primitive_type is the inverse of java_mirror
459 459
460 460 // Check class loader constraints
461 461 static bool add_loader_constraint(symbolHandle name, Handle loader1,
462 462 Handle loader2, TRAPS);
463 463 static char* check_signature_loaders(symbolHandle signature, Handle loader1,
464 464 Handle loader2, bool is_method, TRAPS);
465 465
466 466 // JSR 292
467 467 // find the java.dyn.MethodHandles::invoke method for a given signature
468 468 static methodOop find_method_handle_invoke(symbolHandle signature,
469 469 Handle class_loader,
470 470 Handle protection_domain,
471 471 TRAPS);
472 472 // ask Java to compute the java.dyn.MethodType object for a given signature
473 473 static Handle compute_method_handle_type(symbolHandle signature,
474 474 Handle class_loader,
475 475 Handle protection_domain,
476 476 TRAPS);
477 477 // ask Java to create a dynamic call site, while linking an invokedynamic op
478 478 static Handle make_dynamic_call_site(KlassHandle caller,
479 479 int caller_method_idnum,
480 480 int caller_bci,
481 481 symbolHandle name,
482 482 methodHandle mh_invoke,
483 483 TRAPS);
484 484
485 485 // coordinate with Java about bootstrap methods
486 486 static Handle find_bootstrap_method(KlassHandle caller,
487 487 // This argument is non-null only when a
488 488 // classfile attribute has been found:
489 489 KlassHandle search_bootstrap_klass,
490 490 TRAPS);
491 491
492 492 // Utility for printing loader "name" as part of tracing constraints
493 493 static const char* loader_name(oop loader) {
494 494 return ((loader) == NULL ? "<bootloader>" :
495 495 instanceKlass::cast((loader)->klass())->name()->as_C_string() );
496 496 }
497 497
498 498 // Record the error when the first attempt to resolve a reference from a constant
499 499 // pool entry to a class fails.
500 500 static void add_resolution_error(constantPoolHandle pool, int which, symbolHandle error);
501 501 static symbolOop find_resolution_error(constantPoolHandle pool, int which);
502 502
503 503 private:
504 504
505 505 enum Constants {
506 506 _loader_constraint_size = 107, // number of entries in constraint table
507 507 _resolution_error_size = 107, // number of entries in resolution error table
508 508 _invoke_method_size = 139, // number of entries in invoke method table
509 509 _nof_buckets = 1009 // number of buckets in hash table
510 510 };
511 511
512 512
513 513 // Static variables
514 514
515 515 // Hashtable holding loaded classes.
516 516 static Dictionary* _dictionary;
517 517
518 518 // Hashtable holding placeholders for classes being loaded.
519 519 static PlaceholderTable* _placeholders;
520 520
521 521 // Hashtable holding classes from the shared archive.
522 522 static Dictionary* _shared_dictionary;
523 523
524 524 // Monotonically increasing counter which grows with
525 525 // _number_of_classes as well as hot-swapping and breakpoint setting
526 526 // and removal.
527 527 static int _number_of_modifications;
528 528
529 529 // Lock object for system class loader
530 530 static oop _system_loader_lock_obj;
531 531
532 532 // Constraints on class loaders
533 533 static LoaderConstraintTable* _loader_constraints;
534 534
535 535 // Resolution errors
536 536 static ResolutionErrorTable* _resolution_errors;
537 537
538 538 // Invoke methods (JSR 292)
539 539 static SymbolPropertyTable* _invoke_method_table;
540 540
541 541 public:
542 542 // for VM_CounterDecay iteration support
543 543 friend class CounterDecay;
544 544 static klassOop try_get_next_class();
545 545
546 546 private:
547 547 static void validate_protection_domain(instanceKlassHandle klass,
548 548 Handle class_loader,
549 549 Handle protection_domain, TRAPS);
550 550
551 551 friend class VM_PopulateDumpSharedSpace;
552 552 friend class TraversePlaceholdersClosure;
553 553 static Dictionary* dictionary() { return _dictionary; }
554 554 static Dictionary* shared_dictionary() { return _shared_dictionary; }
555 555 static PlaceholderTable* placeholders() { return _placeholders; }
556 556 static LoaderConstraintTable* constraints() { return _loader_constraints; }
557 557 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; }
558 558 static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; }
559 559
560 560 // Basic loading operations
561 561 static klassOop resolve_instance_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS);
562 562 static klassOop resolve_array_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS);
563 563 static instanceKlassHandle handle_parallel_super_load(symbolHandle class_name, symbolHandle supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS);
564 564 // Wait on SystemDictionary_lock; unlocks lockObject before
565 565 // waiting; relocks lockObject with correct recursion count
566 566 // after waiting, but before reentering SystemDictionary_lock
567 567 // to preserve lock order semantics.
568 568 static void double_lock_wait(Handle lockObject, TRAPS);
569 569 static void define_instance_class(instanceKlassHandle k, TRAPS);
570 570 static instanceKlassHandle find_or_define_instance_class(symbolHandle class_name,
571 571 Handle class_loader,
572 572 instanceKlassHandle k, TRAPS);
573 573 static instanceKlassHandle load_shared_class(symbolHandle class_name,
574 574 Handle class_loader, TRAPS);
575 575 static instanceKlassHandle load_shared_class(instanceKlassHandle ik,
576 576 Handle class_loader, TRAPS);
577 577 static instanceKlassHandle load_instance_class(symbolHandle class_name, Handle class_loader, TRAPS);
578 578 static Handle compute_loader_lock_object(Handle class_loader, TRAPS);
579 579 static void check_loader_lock_contention(Handle loader_lock, TRAPS);
580 580 static bool is_parallelCapable(Handle class_loader);
581 581 static bool is_parallelDefine(Handle class_loader);
582 582
583 583 static klassOop find_shared_class(symbolHandle class_name);
584 584
585 585 // Setup link to hierarchy
586 586 static void add_to_hierarchy(instanceKlassHandle k, TRAPS);
587 587
588 588 private:
589 589 // We pass in the hashtable index so we can calculate it outside of
590 590 // the SystemDictionary_lock.
591 591
592 592 // Basic find on loaded classes
593 593 static klassOop find_class(int index, unsigned int hash,
594 594 symbolHandle name, Handle loader);
595 595
596 596 // Basic find on classes in the midst of being loaded
597 597 static symbolOop find_placeholder(int index, unsigned int hash,
598 598 symbolHandle name, Handle loader);
599 599
600 600 // Basic find operation of loaded classes and classes in the midst
601 601 // of loading; used for assertions and verification only.
602 602 static oop find_class_or_placeholder(symbolHandle class_name,
603 603 Handle class_loader);
604 604
605 605 // Updating entry in dictionary
606 606 // Add a completely loaded class
607 607 static void add_klass(int index, symbolHandle class_name,
608 608 Handle class_loader, KlassHandle obj);
609 609
610 610 // Add a placeholder for a class being loaded
611 611 static void add_placeholder(int index,
612 612 symbolHandle class_name,
613 613 Handle class_loader);
614 614 static void remove_placeholder(int index,
615 615 symbolHandle class_name,
616 616 Handle class_loader);
617 617
618 618 // Performs cleanups after resolve_super_or_fail. This typically needs
619 619 // to be called on failure.
620 620 // Won't throw, but can block.
621 621 static void resolution_cleanups(symbolHandle class_name,
622 622 Handle class_loader,
623 623 TRAPS);
624 624
625 625 // Initialization
626 626 static void initialize_preloaded_classes(TRAPS);
627 627
628 628 // Class loader constraints
629 629 static void check_constraints(int index, unsigned int hash,
630 630 instanceKlassHandle k, Handle loader,
631 631 bool defining, TRAPS);
632 632 static void update_dictionary(int d_index, unsigned int d_hash,
633 633 int p_index, unsigned int p_hash,
634 634 instanceKlassHandle k, Handle loader, TRAPS);
635 635
636 636 // Variables holding commonly used klasses (preloaded)
637 637 static klassOop _well_known_klasses[];
638 638
639 639 // Lazily loaded klasses
640 640 static volatile klassOop _abstract_ownable_synchronizer_klass;
641 641
642 642 // table of box klasses (int_klass, etc.)
643 643 static klassOop _box_klasses[T_VOID+1];
644 644
645 645 static oop _java_system_loader;
646 646
647 647 static bool _has_loadClassInternal;
648 648 static bool _has_checkPackageAccess;
649 649 };
650 650
651 651 // Cf. vmSymbols vs. vmSymbolHandles
652 652 class SystemDictionaryHandles : AllStatic {
653 653 public:
654 654 #define WK_KLASS_HANDLE_DECLARE(name, ignore_symbol, option) \
655 655 static KlassHandle name() { \
656 656 SystemDictionary::name(); \
657 657 klassOop* loc = &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \
658 658 return KlassHandle(loc, true); \
659 659 }
660 660 WK_KLASSES_DO(WK_KLASS_HANDLE_DECLARE);
661 661 #undef WK_KLASS_HANDLE_DECLARE
662 662
663 663 static KlassHandle box_klass(BasicType t);
664 664 };
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