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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, 2011, 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
36 36 // The system dictionary stores all loaded classes and maps:
37 37 //
38 38 // [class name,class loader] -> class i.e. [Symbol*,oop] -> klassOop
39 39 //
40 40 // Classes are loaded lazily. The default VM class loader is
41 41 // represented as NULL.
42 42
43 43 // The underlying data structure is an open hash table with a fixed number
44 44 // of buckets. During loading the loader object is locked, (for the VM loader
45 45 // a private lock object is used). Class loading can thus be done concurrently,
46 46 // but only by different loaders.
47 47 //
48 48 // During loading a placeholder (name, loader) is temporarily placed in
49 49 // a side data structure, and is used to detect ClassCircularityErrors
50 50 // and to perform verification during GC. A GC can occur in the midst
51 51 // of class loading, as we call out to Java, have to take locks, etc.
52 52 //
53 53 // When class loading is finished, a new entry is added to the system
54 54 // dictionary and the place holder is removed. Note that the protection
55 55 // domain field of the system dictionary has not yet been filled in when
56 56 // the "real" system dictionary entry is created.
57 57 //
58 58 // Clients of this class who are interested in finding if a class has
59 59 // been completely loaded -- not classes in the process of being loaded --
60 60 // can read the SystemDictionary unlocked. This is safe because
61 61 // - entries are only deleted at safepoints
62 62 // - readers cannot come to a safepoint while actively examining
63 63 // an entry (an entry cannot be deleted from under a reader)
64 64 // - entries must be fully formed before they are available to concurrent
65 65 // readers (we must ensure write ordering)
66 66 //
67 67 // Note that placeholders are deleted at any time, as they are removed
68 68 // when a class is completely loaded. Therefore, readers as well as writers
69 69 // of placeholders must hold the SystemDictionary_lock.
70 70 //
71 71
72 72 class Dictionary;
73 73 class PlaceholderTable;
74 74 class LoaderConstraintTable;
75 75 class HashtableBucket;
76 76 class ResolutionErrorTable;
77 77 class SymbolPropertyTable;
78 78
79 79 // Certain classes are preloaded, such as java.lang.Object and java.lang.String.
80 80 // They are all "well-known", in the sense that no class loader is allowed
81 81 // to provide a different definition.
82 82 //
83 83 // These klasses must all have names defined in vmSymbols.
84 84
85 85 #define WK_KLASS_ENUM_NAME(kname) kname##_knum
86 86
87 87 // Each well-known class has a short klass name (like object_klass),
88 88 // a vmSymbol name (like java_lang_Object), and a flag word
89 89 // that makes some minor distinctions, like whether the klass
90 90 // is preloaded, optional, release-specific, etc.
91 91 // The order of these definitions is significant; it is the order in which
92 92 // preloading is actually performed by initialize_preloaded_classes.
93 93
94 94 #define WK_KLASSES_DO(template) \
95 95 /* well-known classes */ \
96 96 template(Object_klass, java_lang_Object, Pre) \
97 97 template(String_klass, java_lang_String, Pre) \
98 98 template(Class_klass, java_lang_Class, Pre) \
99 99 template(Cloneable_klass, java_lang_Cloneable, Pre) \
100 100 template(ClassLoader_klass, java_lang_ClassLoader, Pre) \
101 101 template(Serializable_klass, java_io_Serializable, Pre) \
102 102 template(System_klass, java_lang_System, Pre) \
103 103 template(Throwable_klass, java_lang_Throwable, Pre) \
104 104 template(Error_klass, java_lang_Error, Pre) \
105 105 template(ThreadDeath_klass, java_lang_ThreadDeath, Pre) \
106 106 template(Exception_klass, java_lang_Exception, Pre) \
107 107 template(RuntimeException_klass, java_lang_RuntimeException, Pre) \
108 108 template(ProtectionDomain_klass, java_security_ProtectionDomain, Pre) \
109 109 template(AccessControlContext_klass, java_security_AccessControlContext, Pre) \
110 110 template(ClassNotFoundException_klass, java_lang_ClassNotFoundException, Pre) \
111 111 template(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre) \
112 112 template(LinkageError_klass, java_lang_LinkageError, Pre) \
113 113 template(ClassCastException_klass, java_lang_ClassCastException, Pre) \
114 114 template(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre) \
115 115 template(VirtualMachineError_klass, java_lang_VirtualMachineError, Pre) \
116 116 template(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre) \
117 117 template(StackOverflowError_klass, java_lang_StackOverflowError, Pre) \
118 118 template(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre) \
119 119 template(Reference_klass, java_lang_ref_Reference, Pre) \
120 120 \
121 121 /* Preload ref klasses and set reference types */ \
122 122 template(SoftReference_klass, java_lang_ref_SoftReference, Pre) \
123 123 template(WeakReference_klass, java_lang_ref_WeakReference, Pre) \
124 124 template(FinalReference_klass, java_lang_ref_FinalReference, Pre) \
125 125 template(PhantomReference_klass, java_lang_ref_PhantomReference, Pre) \
126 126 template(Finalizer_klass, java_lang_ref_Finalizer, Pre) \
127 127 \
128 128 template(Thread_klass, java_lang_Thread, Pre) \
129 129 template(ThreadGroup_klass, java_lang_ThreadGroup, Pre) \
130 130 template(Properties_klass, java_util_Properties, Pre) \
131 131 template(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject, Pre) \
132 132 template(reflect_Field_klass, java_lang_reflect_Field, Pre) \
133 133 template(reflect_Method_klass, java_lang_reflect_Method, Pre) \
134 134 template(reflect_Constructor_klass, java_lang_reflect_Constructor, Pre) \
135 135 \
136 136 /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \
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136 lines elided |
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137 137 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
138 138 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
139 139 template(reflect_MagicAccessorImpl_klass, sun_reflect_MagicAccessorImpl, Opt) \
140 140 template(reflect_MethodAccessorImpl_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \
141 141 template(reflect_ConstructorAccessorImpl_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \
142 142 template(reflect_DelegatingClassLoader_klass, sun_reflect_DelegatingClassLoader, Opt) \
143 143 template(reflect_ConstantPool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15) \
144 144 template(reflect_UnsafeStaticFieldAccessorImpl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15) \
145 145 \
146 146 /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \
147 - template(MethodHandle_klass, java_lang_invoke_MethodHandle, Pre_JSR292) \
148 - template(MemberName_klass, java_lang_invoke_MemberName, Pre_JSR292) \
149 - template(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives, Pre_JSR292) \
150 - template(AdapterMethodHandle_klass, java_lang_invoke_AdapterMethodHandle, Pre_JSR292) \
151 - template(BoundMethodHandle_klass, java_lang_invoke_BoundMethodHandle, Pre_JSR292) \
152 - template(DirectMethodHandle_klass, java_lang_invoke_DirectMethodHandle, Pre_JSR292) \
153 - template(MethodType_klass, java_lang_invoke_MethodType, Pre_JSR292) \
154 - template(MethodTypeForm_klass, java_lang_invoke_MethodTypeForm, Pre_JSR292) \
155 - template(BootstrapMethodError_klass, java_lang_BootstrapMethodError, Pre_JSR292) \
147 + template(MethodHandle_klass, java_lang_invoke_MethodHandle, Pre_JSR292) \
148 + template(MemberName_klass, java_lang_invoke_MemberName, Pre_JSR292) \
149 + template(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives, Pre_JSR292) \
150 + template(AdapterMethodHandle_klass, java_lang_invoke_AdapterMethodHandle, Pre_JSR292) \
151 + template(BoundMethodHandle_klass, java_lang_invoke_BoundMethodHandle, Pre_JSR292) \
152 + template(DirectMethodHandle_klass, java_lang_invoke_DirectMethodHandle, Pre_JSR292) \
153 + template(MethodType_klass, java_lang_invoke_MethodType, Pre_JSR292) \
154 + template(MethodTypeForm_klass, java_lang_invoke_MethodTypeForm, Pre_JSR292) \
155 + template(BootstrapMethodError_klass, java_lang_BootstrapMethodError, Pre_JSR292) \
156 156 template(WrongMethodTypeException_klass, java_lang_invoke_WrongMethodTypeException, Pre_JSR292) \
157 - template(CallSite_klass, java_lang_invoke_CallSite, Pre_JSR292) \
158 - /* Note: MethodHandle must be first, and CallSite last in group */ \
157 + template(CallSite_klass, java_lang_invoke_CallSite, Pre_JSR292) \
158 + template(ConstantCallSite_klass, java_lang_invoke_ConstantCallSite, Pre_JSR292) \
159 + template(MutableCallSite_klass, java_lang_invoke_MutableCallSite, Pre_JSR292) \
160 + template(VolatileCallSite_klass, java_lang_invoke_VolatileCallSite, Pre_JSR292) \
161 + /* Note: MethodHandle must be first, and VolatileCallSite last in group */ \
159 162 \
160 163 template(StringBuffer_klass, java_lang_StringBuffer, Pre) \
161 164 template(StringBuilder_klass, java_lang_StringBuilder, Pre) \
162 165 \
163 166 /* It's NULL in non-1.4 JDKs. */ \
164 167 template(StackTraceElement_klass, java_lang_StackTraceElement, Opt) \
165 168 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
166 169 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
167 170 template(java_nio_Buffer_klass, java_nio_Buffer, Opt) \
168 171 \
169 172 /* If this class isn't present, it won't be referenced. */ \
170 173 template(sun_misc_AtomicLongCSImpl_klass, sun_misc_AtomicLongCSImpl, Opt) \
171 174 \
172 175 template(sun_jkernel_DownloadManager_klass, sun_jkernel_DownloadManager, Opt_Kernel) \
173 176 \
174 177 template(sun_misc_PostVMInitHook_klass, sun_misc_PostVMInitHook, Opt) \
175 178 \
176 179 /* Preload boxing klasses */ \
177 180 template(Boolean_klass, java_lang_Boolean, Pre) \
178 181 template(Character_klass, java_lang_Character, Pre) \
179 182 template(Float_klass, java_lang_Float, Pre) \
180 183 template(Double_klass, java_lang_Double, Pre) \
181 184 template(Byte_klass, java_lang_Byte, Pre) \
182 185 template(Short_klass, java_lang_Short, Pre) \
183 186 template(Integer_klass, java_lang_Integer, Pre) \
184 187 template(Long_klass, java_lang_Long, Pre) \
185 188 /*end*/
186 189
187 190
188 191 class SystemDictionary : AllStatic {
189 192 friend class VMStructs;
190 193 friend class CompactingPermGenGen;
191 194 friend class SystemDictionaryHandles;
192 195 NOT_PRODUCT(friend class instanceKlassKlass;)
193 196
194 197 public:
195 198 enum WKID {
196 199 NO_WKID = 0,
197 200
198 201 #define WK_KLASS_ENUM(name, ignore_s, ignore_o) WK_KLASS_ENUM_NAME(name),
199 202 WK_KLASSES_DO(WK_KLASS_ENUM)
200 203 #undef WK_KLASS_ENUM
201 204
202 205 WKID_LIMIT,
203 206
204 207 FIRST_WKID = NO_WKID + 1
205 208 };
206 209
207 210 enum InitOption {
208 211 Pre, // preloaded; error if not present
209 212 Pre_JSR292, // preloaded if EnableInvokeDynamic
210 213
211 214 // Order is significant. Options before this point require resolve_or_fail.
212 215 // Options after this point will use resolve_or_null instead.
213 216
214 217 Opt, // preload tried; NULL if not present
215 218 Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection
216 219 Opt_Only_JDK15, // preload tried; use only with JDK1.5+
217 220 Opt_Kernel, // preload tried only #ifdef KERNEL
218 221 OPTION_LIMIT,
219 222 CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT)
220 223 };
221 224
222 225
223 226 // Returns a class with a given class name and class loader. Loads the
224 227 // class if needed. If not found a NoClassDefFoundError or a
225 228 // ClassNotFoundException is thrown, depending on the value on the
226 229 // throw_error flag. For most uses the throw_error argument should be set
227 230 // to true.
228 231
229 232 static klassOop resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS);
230 233 // Convenient call for null loader and protection domain.
231 234 static klassOop resolve_or_fail(Symbol* class_name, bool throw_error, TRAPS);
232 235 private:
233 236 // handle error translation for resolve_or_null results
234 237 static klassOop handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS);
235 238
236 239 public:
237 240
238 241 // Returns a class with a given class name and class loader.
239 242 // Loads the class if needed. If not found NULL is returned.
240 243 static klassOop resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
241 244 // Version with null loader and protection domain
242 245 static klassOop resolve_or_null(Symbol* class_name, TRAPS);
243 246
244 247 // Resolve a superclass or superinterface. Called from ClassFileParser,
245 248 // parse_interfaces, resolve_instance_class_or_null, load_shared_class
246 249 // "child_name" is the class whose super class or interface is being resolved.
247 250 static klassOop resolve_super_or_fail(Symbol* child_name,
248 251 Symbol* class_name,
249 252 Handle class_loader,
250 253 Handle protection_domain,
251 254 bool is_superclass,
252 255 TRAPS);
253 256
254 257 // Parse new stream. This won't update the system dictionary or
255 258 // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses.
256 259 static klassOop parse_stream(Symbol* class_name,
257 260 Handle class_loader,
258 261 Handle protection_domain,
259 262 ClassFileStream* st,
260 263 TRAPS) {
261 264 KlassHandle nullHandle;
262 265 return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD);
263 266 }
264 267 static klassOop parse_stream(Symbol* class_name,
265 268 Handle class_loader,
266 269 Handle protection_domain,
267 270 ClassFileStream* st,
268 271 KlassHandle host_klass,
269 272 GrowableArray<Handle>* cp_patches,
270 273 TRAPS);
271 274
272 275 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass)
273 276 static klassOop resolve_from_stream(Symbol* class_name, Handle class_loader,
274 277 Handle protection_domain,
275 278 ClassFileStream* st, bool verify, TRAPS);
276 279
277 280 // Lookup an already loaded class. If not found NULL is returned.
278 281 static klassOop find(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
279 282
280 283 // Lookup an already loaded instance or array class.
281 284 // Do not make any queries to class loaders; consult only the cache.
282 285 // If not found NULL is returned.
283 286 static klassOop find_instance_or_array_klass(Symbol* class_name,
284 287 Handle class_loader,
285 288 Handle protection_domain,
286 289 TRAPS);
287 290
288 291 // If the given name is known to vmSymbols, return the well-know klass:
289 292 static klassOop find_well_known_klass(Symbol* class_name);
290 293
291 294 // Lookup an instance or array class that has already been loaded
292 295 // either into the given class loader, or else into another class
293 296 // loader that is constrained (via loader constraints) to produce
294 297 // a consistent class. Do not take protection domains into account.
295 298 // Do not make any queries to class loaders; consult only the cache.
296 299 // Return NULL if the class is not found.
297 300 //
298 301 // This function is a strict superset of find_instance_or_array_klass.
299 302 // This function (the unchecked version) makes a conservative prediction
300 303 // of the result of the checked version, assuming successful lookup.
301 304 // If both functions return non-null, they must return the same value.
302 305 // Also, the unchecked version may sometimes be non-null where the
303 306 // checked version is null. This can occur in several ways:
304 307 // 1. No query has yet been made to the class loader.
305 308 // 2. The class loader was queried, but chose not to delegate.
306 309 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain.
307 310 // 4. Loading was attempted, but there was a linkage error of some sort.
308 311 // In all of these cases, the loader constraints on this type are
309 312 // satisfied, and it is safe for classes in the given class loader
310 313 // to manipulate strongly-typed values of the found class, subject
311 314 // to local linkage and access checks.
312 315 static klassOop find_constrained_instance_or_array_klass(Symbol* class_name,
313 316 Handle class_loader,
314 317 TRAPS);
315 318
316 319 // Iterate over all klasses in dictionary
317 320 // Just the classes from defining class loaders
318 321 static void classes_do(void f(klassOop));
319 322 // Added for initialize_itable_for_klass to handle exceptions
320 323 static void classes_do(void f(klassOop, TRAPS), TRAPS);
321 324 // All classes, and their class loaders
322 325 static void classes_do(void f(klassOop, oop));
323 326 // All classes, and their class loaders
324 327 // (added for helpers that use HandleMarks and ResourceMarks)
325 328 static void classes_do(void f(klassOop, oop, TRAPS), TRAPS);
326 329 // All entries in the placeholder table and their class loaders
327 330 static void placeholders_do(void f(Symbol*, oop));
328 331
329 332 // Iterate over all methods in all klasses in dictionary
330 333 static void methods_do(void f(methodOop));
331 334
332 335 // Garbage collection support
333 336
334 337 // This method applies "blk->do_oop" to all the pointers to "system"
335 338 // classes and loaders.
336 339 static void always_strong_oops_do(OopClosure* blk);
337 340 static void always_strong_classes_do(OopClosure* blk);
338 341 // This method applies "blk->do_oop" to all the placeholders.
339 342 static void placeholders_do(OopClosure* blk);
340 343
341 344 // Unload (that is, break root links to) all unmarked classes and
342 345 // loaders. Returns "true" iff something was unloaded.
343 346 static bool do_unloading(BoolObjectClosure* is_alive);
344 347
345 348 // Applies "f->do_oop" to all root oops in the system dictionary.
346 349 static void oops_do(OopClosure* f);
347 350
348 351 // System loader lock
349 352 static oop system_loader_lock() { return _system_loader_lock_obj; }
350 353
351 354 private:
352 355 // Traverses preloaded oops: various system classes. These are
353 356 // guaranteed to be in the perm gen.
354 357 static void preloaded_oops_do(OopClosure* f);
355 358 static void lazily_loaded_oops_do(OopClosure* f);
356 359
357 360 public:
358 361 // Sharing support.
359 362 static void reorder_dictionary();
360 363 static void copy_buckets(char** top, char* end);
361 364 static void copy_table(char** top, char* end);
362 365 static void reverse();
363 366 static void set_shared_dictionary(HashtableBucket* t, int length,
364 367 int number_of_entries);
365 368 // Printing
366 369 static void print() PRODUCT_RETURN;
367 370 static void print_class_statistics() PRODUCT_RETURN;
368 371 static void print_method_statistics() PRODUCT_RETURN;
369 372
370 373 // Number of contained klasses
371 374 // This is both fully loaded classes and classes in the process
372 375 // of being loaded
373 376 static int number_of_classes();
374 377
375 378 // Monotonically increasing counter which grows as classes are
376 379 // loaded or modifications such as hot-swapping or setting/removing
377 380 // of breakpoints are performed
378 381 static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; }
379 382 // Needed by evolution and breakpoint code
380 383 static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; }
381 384
382 385 // Verification
383 386 static void verify();
384 387
385 388 #ifdef ASSERT
386 389 static bool is_internal_format(Symbol* class_name);
387 390 #endif
388 391
389 392 // Verify class is in dictionary
390 393 static void verify_obj_klass_present(Handle obj,
391 394 Symbol* class_name,
392 395 Handle class_loader);
393 396
394 397 // Initialization
395 398 static void initialize(TRAPS);
396 399
397 400 // Fast access to commonly used classes (preloaded)
398 401 static klassOop check_klass(klassOop k) {
399 402 assert(k != NULL, "preloaded klass not initialized");
400 403 return k;
401 404 }
402 405
403 406 static klassOop check_klass_Pre(klassOop k) { return check_klass(k); }
404 407 static klassOop check_klass_Pre_JSR292(klassOop k) { return EnableInvokeDynamic ? check_klass(k) : k; }
405 408 static klassOop check_klass_Opt(klassOop k) { return k; }
406 409 static klassOop check_klass_Opt_Kernel(klassOop k) { return k; } //== Opt
407 410 static klassOop check_klass_Opt_Only_JDK15(klassOop k) {
408 411 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only");
409 412 return k;
410 413 }
411 414 static klassOop check_klass_Opt_Only_JDK14NewRef(klassOop k) {
412 415 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only");
413 416 // despite the optional loading, if you use this it must be present:
414 417 return check_klass(k);
415 418 }
416 419
417 420 static bool initialize_wk_klass(WKID id, int init_opt, TRAPS);
418 421 static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS);
419 422 static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) {
420 423 int limit = (int)end_id + 1;
421 424 initialize_wk_klasses_until((WKID) limit, start_id, THREAD);
422 425 }
423 426
424 427 public:
425 428 #define WK_KLASS_DECLARE(name, ignore_symbol, option) \
426 429 static klassOop name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); }
427 430 WK_KLASSES_DO(WK_KLASS_DECLARE);
428 431 #undef WK_KLASS_DECLARE
429 432
430 433 // Local definition for direct access to the private array:
431 434 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]
432 435
433 436 static klassOop box_klass(BasicType t) {
434 437 assert((uint)t < T_VOID+1, "range check");
435 438 return check_klass(_box_klasses[t]);
436 439 }
437 440 static BasicType box_klass_type(klassOop k); // inverse of box_klass
438 441
439 442 // methods returning lazily loaded klasses
440 443 // The corresponding method to load the class must be called before calling them.
441 444 static klassOop abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); }
442 445
443 446 static void load_abstract_ownable_synchronizer_klass(TRAPS);
444 447
445 448 private:
446 449 // Tells whether ClassLoader.loadClassInternal is present
447 450 static bool has_loadClassInternal() { return _has_loadClassInternal; }
448 451
449 452 public:
450 453 // Tells whether ClassLoader.checkPackageAccess is present
451 454 static bool has_checkPackageAccess() { return _has_checkPackageAccess; }
452 455
453 456 static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; }
454 457 static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; }
455 458
456 459 // Returns default system loader
457 460 static oop java_system_loader();
458 461
459 462 // Compute the default system loader
460 463 static void compute_java_system_loader(TRAPS);
461 464
462 465 private:
463 466 // Mirrors for primitive classes (created eagerly)
464 467 static oop check_mirror(oop m) {
465 468 assert(m != NULL, "mirror not initialized");
466 469 return m;
467 470 }
468 471
469 472 public:
470 473 // Note: java_lang_Class::primitive_type is the inverse of java_mirror
471 474
472 475 // Check class loader constraints
473 476 static bool add_loader_constraint(Symbol* name, Handle loader1,
474 477 Handle loader2, TRAPS);
475 478 static char* check_signature_loaders(Symbol* signature, Handle loader1,
476 479 Handle loader2, bool is_method, TRAPS);
477 480
478 481 // JSR 292
479 482 // find the java.lang.invoke.MethodHandles::invoke method for a given signature
480 483 static methodOop find_method_handle_invoke(Symbol* name,
481 484 Symbol* signature,
482 485 KlassHandle accessing_klass,
483 486 TRAPS);
484 487 // ask Java to compute a java.lang.invoke.MethodType object for a given signature
485 488 static Handle find_method_handle_type(Symbol* signature,
486 489 KlassHandle accessing_klass,
487 490 bool for_invokeGeneric,
488 491 bool& return_bcp_flag,
489 492 TRAPS);
490 493 // ask Java to compute a java.lang.invoke.MethodHandle object for a given CP entry
491 494 static Handle link_method_handle_constant(KlassHandle caller,
492 495 int ref_kind, //e.g., JVM_REF_invokeVirtual
493 496 KlassHandle callee,
494 497 Symbol* name,
495 498 Symbol* signature,
496 499 TRAPS);
497 500 // ask Java to create a dynamic call site, while linking an invokedynamic op
498 501 static Handle make_dynamic_call_site(Handle bootstrap_method,
499 502 // Callee information:
500 503 Symbol* name,
501 504 methodHandle signature_invoker,
502 505 Handle info,
503 506 // Caller information:
504 507 methodHandle caller_method,
505 508 int caller_bci,
506 509 TRAPS);
507 510
508 511 // coordinate with Java about bootstrap methods
509 512 static Handle find_bootstrap_method(methodHandle caller_method,
510 513 int caller_bci, // N.B. must be an invokedynamic
511 514 int cache_index, // must be corresponding main_entry
512 515 Handle &argument_info_result, // static BSM arguments, if any
513 516 TRAPS);
514 517
515 518 // Utility for printing loader "name" as part of tracing constraints
516 519 static const char* loader_name(oop loader) {
517 520 return ((loader) == NULL ? "<bootloader>" :
518 521 instanceKlass::cast((loader)->klass())->name()->as_C_string() );
519 522 }
520 523
521 524 // Record the error when the first attempt to resolve a reference from a constant
522 525 // pool entry to a class fails.
523 526 static void add_resolution_error(constantPoolHandle pool, int which, Symbol* error);
524 527 static Symbol* find_resolution_error(constantPoolHandle pool, int which);
525 528
526 529 private:
527 530
528 531 enum Constants {
529 532 _loader_constraint_size = 107, // number of entries in constraint table
530 533 _resolution_error_size = 107, // number of entries in resolution error table
531 534 _invoke_method_size = 139, // number of entries in invoke method table
532 535 _nof_buckets = 1009 // number of buckets in hash table
533 536 };
534 537
535 538
536 539 // Static variables
537 540
538 541 // Hashtable holding loaded classes.
539 542 static Dictionary* _dictionary;
540 543
541 544 // Hashtable holding placeholders for classes being loaded.
542 545 static PlaceholderTable* _placeholders;
543 546
544 547 // Hashtable holding classes from the shared archive.
545 548 static Dictionary* _shared_dictionary;
546 549
547 550 // Monotonically increasing counter which grows with
548 551 // _number_of_classes as well as hot-swapping and breakpoint setting
549 552 // and removal.
550 553 static int _number_of_modifications;
551 554
552 555 // Lock object for system class loader
553 556 static oop _system_loader_lock_obj;
554 557
555 558 // Constraints on class loaders
556 559 static LoaderConstraintTable* _loader_constraints;
557 560
558 561 // Resolution errors
559 562 static ResolutionErrorTable* _resolution_errors;
560 563
561 564 // Invoke methods (JSR 292)
562 565 static SymbolPropertyTable* _invoke_method_table;
563 566
564 567 public:
565 568 // for VM_CounterDecay iteration support
566 569 friend class CounterDecay;
567 570 static klassOop try_get_next_class();
568 571
569 572 private:
570 573 static void validate_protection_domain(instanceKlassHandle klass,
571 574 Handle class_loader,
572 575 Handle protection_domain, TRAPS);
573 576
574 577 friend class VM_PopulateDumpSharedSpace;
575 578 friend class TraversePlaceholdersClosure;
576 579 static Dictionary* dictionary() { return _dictionary; }
577 580 static Dictionary* shared_dictionary() { return _shared_dictionary; }
578 581 static PlaceholderTable* placeholders() { return _placeholders; }
579 582 static LoaderConstraintTable* constraints() { return _loader_constraints; }
580 583 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; }
581 584 static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; }
582 585
583 586 // Basic loading operations
584 587 static klassOop resolve_instance_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
585 588 static klassOop resolve_array_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
586 589 static instanceKlassHandle handle_parallel_super_load(Symbol* class_name, Symbol* supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS);
587 590 // Wait on SystemDictionary_lock; unlocks lockObject before
588 591 // waiting; relocks lockObject with correct recursion count
589 592 // after waiting, but before reentering SystemDictionary_lock
590 593 // to preserve lock order semantics.
591 594 static void double_lock_wait(Handle lockObject, TRAPS);
592 595 static void define_instance_class(instanceKlassHandle k, TRAPS);
593 596 static instanceKlassHandle find_or_define_instance_class(Symbol* class_name,
594 597 Handle class_loader,
595 598 instanceKlassHandle k, TRAPS);
596 599 static instanceKlassHandle load_shared_class(Symbol* class_name,
597 600 Handle class_loader, TRAPS);
598 601 static instanceKlassHandle load_shared_class(instanceKlassHandle ik,
599 602 Handle class_loader, TRAPS);
600 603 static instanceKlassHandle load_instance_class(Symbol* class_name, Handle class_loader, TRAPS);
601 604 static Handle compute_loader_lock_object(Handle class_loader, TRAPS);
602 605 static void check_loader_lock_contention(Handle loader_lock, TRAPS);
603 606 static bool is_parallelCapable(Handle class_loader);
604 607 static bool is_parallelDefine(Handle class_loader);
605 608
606 609 static klassOop find_shared_class(Symbol* class_name);
607 610
608 611 // Setup link to hierarchy
609 612 static void add_to_hierarchy(instanceKlassHandle k, TRAPS);
610 613
611 614 private:
612 615 // We pass in the hashtable index so we can calculate it outside of
613 616 // the SystemDictionary_lock.
614 617
615 618 // Basic find on loaded classes
616 619 static klassOop find_class(int index, unsigned int hash,
617 620 Symbol* name, Handle loader);
618 621 static klassOop find_class(Symbol* class_name, Handle class_loader);
619 622
620 623 // Basic find on classes in the midst of being loaded
621 624 static Symbol* find_placeholder(Symbol* name, Handle loader);
622 625
623 626 // Updating entry in dictionary
624 627 // Add a completely loaded class
625 628 static void add_klass(int index, Symbol* class_name,
626 629 Handle class_loader, KlassHandle obj);
627 630
628 631 // Add a placeholder for a class being loaded
629 632 static void add_placeholder(int index,
630 633 Symbol* class_name,
631 634 Handle class_loader);
632 635 static void remove_placeholder(int index,
633 636 Symbol* class_name,
634 637 Handle class_loader);
635 638
636 639 // Performs cleanups after resolve_super_or_fail. This typically needs
637 640 // to be called on failure.
638 641 // Won't throw, but can block.
639 642 static void resolution_cleanups(Symbol* class_name,
640 643 Handle class_loader,
641 644 TRAPS);
642 645
643 646 // Initialization
644 647 static void initialize_preloaded_classes(TRAPS);
645 648
646 649 // Class loader constraints
647 650 static void check_constraints(int index, unsigned int hash,
648 651 instanceKlassHandle k, Handle loader,
649 652 bool defining, TRAPS);
650 653 static void update_dictionary(int d_index, unsigned int d_hash,
651 654 int p_index, unsigned int p_hash,
652 655 instanceKlassHandle k, Handle loader, TRAPS);
653 656
654 657 // Variables holding commonly used klasses (preloaded)
655 658 static klassOop _well_known_klasses[];
656 659
657 660 // Lazily loaded klasses
658 661 static volatile klassOop _abstract_ownable_synchronizer_klass;
659 662
660 663 // table of box klasses (int_klass, etc.)
661 664 static klassOop _box_klasses[T_VOID+1];
662 665
663 666 static oop _java_system_loader;
664 667
665 668 static bool _has_loadClassInternal;
666 669 static bool _has_checkPackageAccess;
667 670 };
668 671
669 672 class SystemDictionaryHandles : AllStatic {
670 673 public:
671 674 #define WK_KLASS_HANDLE_DECLARE(name, ignore_symbol, option) \
672 675 static KlassHandle name() { \
673 676 SystemDictionary::name(); \
674 677 klassOop* loc = &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \
675 678 return KlassHandle(loc, true); \
676 679 }
677 680 WK_KLASSES_DO(WK_KLASS_HANDLE_DECLARE);
678 681 #undef WK_KLASS_HANDLE_DECLARE
679 682
680 683 static KlassHandle box_klass(BasicType t);
681 684 };
682 685
683 686 #endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP
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