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--- old/src/share/vm/classfile/systemDictionary.hpp
+++ new/src/share/vm/classfile/systemDictionary.hpp
1 1 /*
2 - * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved.
2 + * Copyright 1997-2010 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(RuntimeException_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(SoftReference_klass, java_lang_ref_SoftReference, Pre) \
112 112 template(WeakReference_klass, java_lang_ref_WeakReference, Pre) \
113 113 template(FinalReference_klass, java_lang_ref_FinalReference, Pre) \
114 114 template(PhantomReference_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_AccessibleObject_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_MagicAccessorImpl_klass, sun_reflect_MagicAccessorImpl, Opt) \
129 129 template(reflect_MethodAccessorImpl_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \
130 130 template(reflect_ConstructorAccessorImpl_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \
131 131 template(reflect_DelegatingClassLoader_klass, sun_reflect_DelegatingClassLoader, Opt) \
132 132 template(reflect_ConstantPool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15) \
133 133 template(reflect_UnsafeStaticFieldAccessorImpl_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) \
137 137 template(MemberName_klass, sun_dyn_MemberName, Opt) \
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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) \
147 147 template(InvokeDynamic_klass, java_dyn_InvokeDynamic, Opt) \
148 - /* Note: MethodHandle must be first, and Dynamic last in group */ \
148 + /* Note: MethodHandle must be first, and InvokeDynamic last in group */ \
149 149 \
150 150 template(StringBuffer_klass, java_lang_StringBuffer, Pre) \
151 151 template(StringBuilder_klass, java_lang_StringBuilder, Pre) \
152 152 \
153 153 /* It's NULL in non-1.4 JDKs. */ \
154 154 template(StackTraceElement_klass, java_lang_StackTraceElement, Opt) \
155 155 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
156 156 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
157 157 template(java_nio_Buffer_klass, java_nio_Buffer, Opt) \
158 158 \
159 159 /* If this class isn't present, it won't be referenced. */ \
160 160 template(sun_misc_AtomicLongCSImpl_klass, sun_misc_AtomicLongCSImpl, Opt) \
161 161 \
162 162 template(sun_jkernel_DownloadManager_klass, sun_jkernel_DownloadManager, Opt_Kernel) \
163 163 \
164 164 /* Preload boxing klasses */ \
165 165 template(Boolean_klass, java_lang_Boolean, Pre) \
166 166 template(Character_klass, java_lang_Character, Pre) \
167 167 template(Float_klass, java_lang_Float, Pre) \
168 168 template(Double_klass, java_lang_Double, Pre) \
169 169 template(Byte_klass, java_lang_Byte, Pre) \
170 170 template(Short_klass, java_lang_Short, Pre) \
171 171 template(Integer_klass, java_lang_Integer, Pre) \
172 172 template(Long_klass, java_lang_Long, Pre) \
173 173 /*end*/
174 174
175 175
176 176 class SystemDictionary : AllStatic {
177 177 friend class VMStructs;
178 178 friend class CompactingPermGenGen;
179 179 friend class SystemDictionaryHandles;
180 180 NOT_PRODUCT(friend class instanceKlassKlass;)
181 181
182 182 public:
183 183 enum WKID {
184 184 NO_WKID = 0,
185 185
186 186 #define WK_KLASS_ENUM(name, ignore_s, ignore_o) WK_KLASS_ENUM_NAME(name),
187 187 WK_KLASSES_DO(WK_KLASS_ENUM)
188 188 #undef WK_KLASS_ENUM
189 189
190 190 WKID_LIMIT,
191 191
192 192 FIRST_WKID = NO_WKID + 1
193 193 };
194 194
195 195 enum InitOption {
196 196 Pre, // preloaded; error if not present
197 197
198 198 // Order is significant. Options before this point require resolve_or_fail.
199 199 // Options after this point will use resolve_or_null instead.
200 200
201 201 Opt, // preload tried; NULL if not present
202 202 Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection
203 203 Opt_Only_JDK15, // preload tried; use only with JDK1.5+
204 204 Opt_Kernel, // preload tried only #ifdef KERNEL
205 205 OPTION_LIMIT,
206 206 CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT)
207 207 };
208 208
209 209
210 210 // Returns a class with a given class name and class loader. Loads the
211 211 // class if needed. If not found a NoClassDefFoundError or a
212 212 // ClassNotFoundException is thrown, depending on the value on the
213 213 // throw_error flag. For most uses the throw_error argument should be set
214 214 // to true.
215 215
216 216 static klassOop resolve_or_fail(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS);
217 217 // Convenient call for null loader and protection domain.
218 218 static klassOop resolve_or_fail(symbolHandle class_name, bool throw_error, TRAPS);
219 219 private:
220 220 // handle error translation for resolve_or_null results
221 221 static klassOop handle_resolution_exception(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS);
222 222
223 223 public:
224 224
225 225 // Returns a class with a given class name and class loader.
226 226 // Loads the class if needed. If not found NULL is returned.
227 227 static klassOop resolve_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS);
228 228 // Version with null loader and protection domain
229 229 static klassOop resolve_or_null(symbolHandle class_name, TRAPS);
230 230
231 231 // Resolve a superclass or superinterface. Called from ClassFileParser,
232 232 // parse_interfaces, resolve_instance_class_or_null, load_shared_class
233 233 // "child_name" is the class whose super class or interface is being resolved.
234 234 static klassOop resolve_super_or_fail(symbolHandle child_name,
235 235 symbolHandle class_name,
236 236 Handle class_loader,
237 237 Handle protection_domain,
238 238 bool is_superclass,
239 239 TRAPS);
240 240
241 241 // Parse new stream. This won't update the system dictionary or
242 242 // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses.
243 243 static klassOop parse_stream(symbolHandle class_name,
244 244 Handle class_loader,
245 245 Handle protection_domain,
246 246 ClassFileStream* st,
247 247 TRAPS) {
248 248 KlassHandle nullHandle;
249 249 return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD);
250 250 }
251 251 static klassOop parse_stream(symbolHandle class_name,
252 252 Handle class_loader,
253 253 Handle protection_domain,
254 254 ClassFileStream* st,
255 255 KlassHandle host_klass,
256 256 GrowableArray<Handle>* cp_patches,
257 257 TRAPS);
258 258
259 259 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass)
260 260 static klassOop resolve_from_stream(symbolHandle class_name, Handle class_loader,
261 261 Handle protection_domain,
262 262 ClassFileStream* st, bool verify, TRAPS);
263 263
264 264 // Lookup an already loaded class. If not found NULL is returned.
265 265 static klassOop find(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS);
266 266
267 267 // Lookup an already loaded instance or array class.
268 268 // Do not make any queries to class loaders; consult only the cache.
269 269 // If not found NULL is returned.
270 270 static klassOop find_instance_or_array_klass(symbolHandle class_name,
271 271 Handle class_loader,
272 272 Handle protection_domain,
273 273 TRAPS);
274 274
275 275 // If the given name is known to vmSymbols, return the well-know klass:
276 276 static klassOop find_well_known_klass(symbolOop class_name);
277 277
278 278 // Lookup an instance or array class that has already been loaded
279 279 // either into the given class loader, or else into another class
280 280 // loader that is constrained (via loader constraints) to produce
281 281 // a consistent class. Do not take protection domains into account.
282 282 // Do not make any queries to class loaders; consult only the cache.
283 283 // Return NULL if the class is not found.
284 284 //
285 285 // This function is a strict superset of find_instance_or_array_klass.
286 286 // This function (the unchecked version) makes a conservative prediction
287 287 // of the result of the checked version, assuming successful lookup.
288 288 // If both functions return non-null, they must return the same value.
289 289 // Also, the unchecked version may sometimes be non-null where the
290 290 // checked version is null. This can occur in several ways:
291 291 // 1. No query has yet been made to the class loader.
292 292 // 2. The class loader was queried, but chose not to delegate.
293 293 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain.
294 294 // 4. Loading was attempted, but there was a linkage error of some sort.
295 295 // In all of these cases, the loader constraints on this type are
296 296 // satisfied, and it is safe for classes in the given class loader
297 297 // to manipulate strongly-typed values of the found class, subject
298 298 // to local linkage and access checks.
299 299 static klassOop find_constrained_instance_or_array_klass(symbolHandle class_name,
300 300 Handle class_loader,
301 301 TRAPS);
302 302
303 303 // Iterate over all klasses in dictionary
304 304 // Just the classes from defining class loaders
305 305 static void classes_do(void f(klassOop));
306 306 // Added for initialize_itable_for_klass to handle exceptions
307 307 static void classes_do(void f(klassOop, TRAPS), TRAPS);
308 308 // All classes, and their class loaders
309 309 static void classes_do(void f(klassOop, oop));
310 310 // All classes, and their class loaders
311 311 // (added for helpers that use HandleMarks and ResourceMarks)
312 312 static void classes_do(void f(klassOop, oop, TRAPS), TRAPS);
313 313 // All entries in the placeholder table and their class loaders
314 314 static void placeholders_do(void f(symbolOop, oop));
315 315
316 316 // Iterate over all methods in all klasses in dictionary
317 317 static void methods_do(void f(methodOop));
318 318
319 319 // Garbage collection support
320 320
321 321 // This method applies "blk->do_oop" to all the pointers to "system"
322 322 // classes and loaders.
323 323 static void always_strong_oops_do(OopClosure* blk);
324 324 static void always_strong_classes_do(OopClosure* blk);
325 325 // This method applies "blk->do_oop" to all the placeholders.
326 326 static void placeholders_do(OopClosure* blk);
327 327
328 328 // Unload (that is, break root links to) all unmarked classes and
329 329 // loaders. Returns "true" iff something was unloaded.
330 330 static bool do_unloading(BoolObjectClosure* is_alive);
331 331
332 332 // Applies "f->do_oop" to all root oops in the system dictionary.
333 333 static void oops_do(OopClosure* f);
334 334
335 335 // System loader lock
336 336 static oop system_loader_lock() { return _system_loader_lock_obj; }
337 337
338 338 private:
339 339 // Traverses preloaded oops: various system classes. These are
340 340 // guaranteed to be in the perm gen.
341 341 static void preloaded_oops_do(OopClosure* f);
342 342 static void lazily_loaded_oops_do(OopClosure* f);
343 343
344 344 public:
345 345 // Sharing support.
346 346 static void reorder_dictionary();
347 347 static void copy_buckets(char** top, char* end);
348 348 static void copy_table(char** top, char* end);
349 349 static void reverse();
350 350 static void set_shared_dictionary(HashtableBucket* t, int length,
351 351 int number_of_entries);
352 352 // Printing
353 353 static void print() PRODUCT_RETURN;
354 354 static void print_class_statistics() PRODUCT_RETURN;
355 355 static void print_method_statistics() PRODUCT_RETURN;
356 356
357 357 // Number of contained klasses
358 358 // This is both fully loaded classes and classes in the process
359 359 // of being loaded
360 360 static int number_of_classes();
361 361
362 362 // Monotonically increasing counter which grows as classes are
363 363 // loaded or modifications such as hot-swapping or setting/removing
364 364 // of breakpoints are performed
365 365 static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; }
366 366 // Needed by evolution and breakpoint code
367 367 static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; }
368 368
369 369 // Verification
370 370 static void verify();
371 371
372 372 #ifdef ASSERT
373 373 static bool is_internal_format(symbolHandle class_name);
374 374 #endif
375 375
376 376 // Verify class is in dictionary
377 377 static void verify_obj_klass_present(Handle obj,
378 378 symbolHandle class_name,
379 379 Handle class_loader);
380 380
381 381 // Initialization
382 382 static void initialize(TRAPS);
383 383
384 384 // Fast access to commonly used classes (preloaded)
385 385 static klassOop check_klass(klassOop k) {
386 386 assert(k != NULL, "preloaded klass not initialized");
387 387 return k;
388 388 }
389 389
390 390 static klassOop check_klass_Pre(klassOop k) { return check_klass(k); }
391 391 static klassOop check_klass_Opt(klassOop k) { return k; }
392 392 static klassOop check_klass_Opt_Kernel(klassOop k) { return k; } //== Opt
393 393 static klassOop check_klass_Opt_Only_JDK15(klassOop k) {
394 394 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only");
395 395 return k;
396 396 }
397 397 static klassOop check_klass_Opt_Only_JDK14NewRef(klassOop k) {
398 398 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only");
399 399 // despite the optional loading, if you use this it must be present:
400 400 return check_klass(k);
401 401 }
402 402
403 403 static bool initialize_wk_klass(WKID id, int init_opt, TRAPS);
404 404 static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS);
405 405 static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) {
406 406 int limit = (int)end_id + 1;
407 407 initialize_wk_klasses_until((WKID) limit, start_id, THREAD);
408 408 }
409 409
410 410 public:
411 411 #define WK_KLASS_DECLARE(name, ignore_symbol, option) \
412 412 static klassOop name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); }
413 413 WK_KLASSES_DO(WK_KLASS_DECLARE);
414 414 #undef WK_KLASS_DECLARE
415 415
416 416 // Local definition for direct access to the private array:
417 417 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]
418 418
419 419 static klassOop box_klass(BasicType t) {
420 420 assert((uint)t < T_VOID+1, "range check");
421 421 return check_klass(_box_klasses[t]);
422 422 }
423 423 static BasicType box_klass_type(klassOop k); // inverse of box_klass
424 424
425 425 // methods returning lazily loaded klasses
426 426 // The corresponding method to load the class must be called before calling them.
427 427 static klassOop abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); }
428 428
429 429 static void load_abstract_ownable_synchronizer_klass(TRAPS);
430 430
431 431 private:
432 432 // Tells whether ClassLoader.loadClassInternal is present
433 433 static bool has_loadClassInternal() { return _has_loadClassInternal; }
434 434
435 435 public:
436 436 // Tells whether ClassLoader.checkPackageAccess is present
437 437 static bool has_checkPackageAccess() { return _has_checkPackageAccess; }
438 438
439 439 static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; }
440 440 static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; }
441 441
442 442 // Returns default system loader
443 443 static oop java_system_loader();
444 444
445 445 // Compute the default system loader
446 446 static void compute_java_system_loader(TRAPS);
447 447
448 448 private:
449 449 // Mirrors for primitive classes (created eagerly)
450 450 static oop check_mirror(oop m) {
451 451 assert(m != NULL, "mirror not initialized");
452 452 return m;
453 453 }
454 454
455 455 public:
456 456 // Note: java_lang_Class::primitive_type is the inverse of java_mirror
457 457
458 458 // Check class loader constraints
459 459 static bool add_loader_constraint(symbolHandle name, Handle loader1,
460 460 Handle loader2, TRAPS);
461 461 static char* check_signature_loaders(symbolHandle signature, Handle loader1,
462 462 Handle loader2, bool is_method, TRAPS);
463 463
464 464 // JSR 292
465 465 // find the java.dyn.MethodHandles::invoke method for a given signature
466 466 static methodOop find_method_handle_invoke(symbolHandle signature,
467 467 Handle class_loader,
468 468 Handle protection_domain,
469 469 TRAPS);
470 470 // ask Java to compute the java.dyn.MethodType object for a given signature
471 471 static Handle compute_method_handle_type(symbolHandle signature,
472 472 Handle class_loader,
473 473 Handle protection_domain,
474 474 TRAPS);
475 475 // ask Java to create a dynamic call site, while linking an invokedynamic op
476 476 static Handle make_dynamic_call_site(KlassHandle caller,
477 477 int caller_method_idnum,
478 478 int caller_bci,
479 479 symbolHandle name,
480 480 methodHandle mh_invoke,
481 481 TRAPS);
482 482
483 483 // coordinate with Java about bootstrap methods
484 484 static Handle find_bootstrap_method(KlassHandle caller,
485 485 // This argument is non-null only when a
486 486 // classfile attribute has been found:
487 487 KlassHandle search_bootstrap_klass,
488 488 TRAPS);
489 489
490 490 // Utility for printing loader "name" as part of tracing constraints
491 491 static const char* loader_name(oop loader) {
492 492 return ((loader) == NULL ? "<bootloader>" :
493 493 instanceKlass::cast((loader)->klass())->name()->as_C_string() );
494 494 }
495 495
496 496 // Record the error when the first attempt to resolve a reference from a constant
497 497 // pool entry to a class fails.
498 498 static void add_resolution_error(constantPoolHandle pool, int which, symbolHandle error);
499 499 static symbolOop find_resolution_error(constantPoolHandle pool, int which);
500 500
501 501 private:
502 502
503 503 enum Constants {
504 504 _loader_constraint_size = 107, // number of entries in constraint table
505 505 _resolution_error_size = 107, // number of entries in resolution error table
506 506 _invoke_method_size = 139, // number of entries in invoke method table
507 507 _nof_buckets = 1009 // number of buckets in hash table
508 508 };
509 509
510 510
511 511 // Static variables
512 512
513 513 // Hashtable holding loaded classes.
514 514 static Dictionary* _dictionary;
515 515
516 516 // Hashtable holding placeholders for classes being loaded.
517 517 static PlaceholderTable* _placeholders;
518 518
519 519 // Hashtable holding classes from the shared archive.
520 520 static Dictionary* _shared_dictionary;
521 521
522 522 // Monotonically increasing counter which grows with
523 523 // _number_of_classes as well as hot-swapping and breakpoint setting
524 524 // and removal.
525 525 static int _number_of_modifications;
526 526
527 527 // Lock object for system class loader
528 528 static oop _system_loader_lock_obj;
529 529
530 530 // Constraints on class loaders
531 531 static LoaderConstraintTable* _loader_constraints;
532 532
533 533 // Resolution errors
534 534 static ResolutionErrorTable* _resolution_errors;
535 535
536 536 // Invoke methods (JSR 292)
537 537 static SymbolPropertyTable* _invoke_method_table;
538 538
539 539 public:
540 540 // for VM_CounterDecay iteration support
541 541 friend class CounterDecay;
542 542 static klassOop try_get_next_class();
543 543
544 544 private:
545 545 static void validate_protection_domain(instanceKlassHandle klass,
546 546 Handle class_loader,
547 547 Handle protection_domain, TRAPS);
548 548
549 549 friend class VM_PopulateDumpSharedSpace;
550 550 friend class TraversePlaceholdersClosure;
551 551 static Dictionary* dictionary() { return _dictionary; }
552 552 static Dictionary* shared_dictionary() { return _shared_dictionary; }
553 553 static PlaceholderTable* placeholders() { return _placeholders; }
554 554 static LoaderConstraintTable* constraints() { return _loader_constraints; }
555 555 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; }
556 556 static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; }
557 557
558 558 // Basic loading operations
559 559 static klassOop resolve_instance_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS);
560 560 static klassOop resolve_array_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS);
561 561 static instanceKlassHandle handle_parallel_super_load(symbolHandle class_name, symbolHandle supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS);
562 562 // Wait on SystemDictionary_lock; unlocks lockObject before
563 563 // waiting; relocks lockObject with correct recursion count
564 564 // after waiting, but before reentering SystemDictionary_lock
565 565 // to preserve lock order semantics.
566 566 static void double_lock_wait(Handle lockObject, TRAPS);
567 567 static void define_instance_class(instanceKlassHandle k, TRAPS);
568 568 static instanceKlassHandle find_or_define_instance_class(symbolHandle class_name,
569 569 Handle class_loader,
570 570 instanceKlassHandle k, TRAPS);
571 571 static instanceKlassHandle load_shared_class(symbolHandle class_name,
572 572 Handle class_loader, TRAPS);
573 573 static instanceKlassHandle load_shared_class(instanceKlassHandle ik,
574 574 Handle class_loader, TRAPS);
575 575 static instanceKlassHandle load_instance_class(symbolHandle class_name, Handle class_loader, TRAPS);
576 576 static Handle compute_loader_lock_object(Handle class_loader, TRAPS);
577 577 static void check_loader_lock_contention(Handle loader_lock, TRAPS);
578 578 static bool is_parallelCapable(Handle class_loader);
579 579 static bool is_parallelDefine(Handle class_loader);
580 580
581 581 static klassOop find_shared_class(symbolHandle class_name);
582 582
583 583 // Setup link to hierarchy
584 584 static void add_to_hierarchy(instanceKlassHandle k, TRAPS);
585 585
586 586 private:
587 587 // We pass in the hashtable index so we can calculate it outside of
588 588 // the SystemDictionary_lock.
589 589
590 590 // Basic find on loaded classes
591 591 static klassOop find_class(int index, unsigned int hash,
592 592 symbolHandle name, Handle loader);
593 593
594 594 // Basic find on classes in the midst of being loaded
595 595 static symbolOop find_placeholder(int index, unsigned int hash,
596 596 symbolHandle name, Handle loader);
597 597
598 598 // Basic find operation of loaded classes and classes in the midst
599 599 // of loading; used for assertions and verification only.
600 600 static oop find_class_or_placeholder(symbolHandle class_name,
601 601 Handle class_loader);
602 602
603 603 // Updating entry in dictionary
604 604 // Add a completely loaded class
605 605 static void add_klass(int index, symbolHandle class_name,
606 606 Handle class_loader, KlassHandle obj);
607 607
608 608 // Add a placeholder for a class being loaded
609 609 static void add_placeholder(int index,
610 610 symbolHandle class_name,
611 611 Handle class_loader);
612 612 static void remove_placeholder(int index,
613 613 symbolHandle class_name,
614 614 Handle class_loader);
615 615
616 616 // Performs cleanups after resolve_super_or_fail. This typically needs
617 617 // to be called on failure.
618 618 // Won't throw, but can block.
619 619 static void resolution_cleanups(symbolHandle class_name,
620 620 Handle class_loader,
621 621 TRAPS);
622 622
623 623 // Initialization
624 624 static void initialize_preloaded_classes(TRAPS);
625 625
626 626 // Class loader constraints
627 627 static void check_constraints(int index, unsigned int hash,
628 628 instanceKlassHandle k, Handle loader,
629 629 bool defining, TRAPS);
630 630 static void update_dictionary(int d_index, unsigned int d_hash,
631 631 int p_index, unsigned int p_hash,
632 632 instanceKlassHandle k, Handle loader, TRAPS);
633 633
634 634 // Variables holding commonly used klasses (preloaded)
635 635 static klassOop _well_known_klasses[];
636 636
637 637 // Lazily loaded klasses
638 638 static volatile klassOop _abstract_ownable_synchronizer_klass;
639 639
640 640 // table of box klasses (int_klass, etc.)
641 641 static klassOop _box_klasses[T_VOID+1];
642 642
643 643 static oop _java_system_loader;
644 644
645 645 static bool _has_loadClassInternal;
646 646 static bool _has_checkPackageAccess;
647 647 };
648 648
649 649 // Cf. vmSymbols vs. vmSymbolHandles
650 650 class SystemDictionaryHandles : AllStatic {
651 651 public:
652 652 #define WK_KLASS_HANDLE_DECLARE(name, ignore_symbol, option) \
653 653 static KlassHandle name() { \
654 654 SystemDictionary::name(); \
655 655 klassOop* loc = &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \
656 656 return KlassHandle(loc, true); \
657 657 }
658 658 WK_KLASSES_DO(WK_KLASS_HANDLE_DECLARE);
659 659 #undef WK_KLASS_HANDLE_DECLARE
660 660
661 661 static KlassHandle box_klass(BasicType t);
662 662 };
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