47 // Clients of this class who are interested in finding if a class has
48 // been completely loaded -- not classes in the process of being loaded --
49 // can read the SystemDictionary unlocked. This is safe because
50 // - entries are only deleted at safepoints
51 // - readers cannot come to a safepoint while actively examining
52 // an entry (an entry cannot be deleted from under a reader)
53 // - entries must be fully formed before they are available to concurrent
54 // readers (we must ensure write ordering)
55 //
56 // Note that placeholders are deleted at any time, as they are removed
57 // when a class is completely loaded. Therefore, readers as well as writers
58 // of placeholders must hold the SystemDictionary_lock.
59 //
60
61 class Dictionary;
62 class PlaceholderTable;
63 class LoaderConstraintTable;
64 class HashtableBucket;
65 class ResolutionErrorTable;
66
67 class SystemDictionary : AllStatic {
68 friend class VMStructs;
69 friend class CompactingPermGenGen;
70 NOT_PRODUCT(friend class instanceKlassKlass;)
71
72 public:
73 // Returns a class with a given class name and class loader. Loads the
74 // class if needed. If not found a NoClassDefFoundError or a
75 // ClassNotFoundException is thrown, depending on the value on the
76 // throw_error flag. For most uses the throw_error argument should be set
77 // to true.
78
79 static klassOop resolve_or_fail(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS);
80 // Convenient call for null loader and protection domain.
81 static klassOop resolve_or_fail(symbolHandle class_name, bool throw_error, TRAPS);
82 private:
83 // handle error translation for resolve_or_null results
84 static klassOop handle_resolution_exception(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS);
85
86 public:
87
88 // Returns a class with a given class name and class loader.
89 // Loads the class if needed. If not found NULL is returned.
90 static klassOop resolve_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS);
91 // Version with null loader and protection domain
92 static klassOop resolve_or_null(symbolHandle class_name, TRAPS);
106 static klassOop parse_stream(symbolHandle class_name,
107 Handle class_loader,
108 Handle protection_domain,
109 ClassFileStream* st,
110 TRAPS);
111
112 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass)
113 static klassOop resolve_from_stream(symbolHandle class_name, Handle class_loader, Handle protection_domain, ClassFileStream* st, TRAPS);
114
115 // Lookup an already loaded class. If not found NULL is returned.
116 static klassOop find(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS);
117
118 // Lookup an already loaded instance or array class.
119 // Do not make any queries to class loaders; consult only the cache.
120 // If not found NULL is returned.
121 static klassOop find_instance_or_array_klass(symbolHandle class_name,
122 Handle class_loader,
123 Handle protection_domain,
124 TRAPS);
125
126 // Lookup an instance or array class that has already been loaded
127 // either into the given class loader, or else into another class
128 // loader that is constrained (via loader constraints) to produce
129 // a consistent class. Do not take protection domains into account.
130 // Do not make any queries to class loaders; consult only the cache.
131 // Return NULL if the class is not found.
132 //
133 // This function is a strict superset of find_instance_or_array_klass.
134 // This function (the unchecked version) makes a conservative prediction
135 // of the result of the checked version, assuming successful lookup.
136 // If both functions return non-null, they must return the same value.
137 // Also, the unchecked version may sometimes be non-null where the
138 // checked version is null. This can occur in several ways:
139 // 1. No query has yet been made to the class loader.
140 // 2. The class loader was queried, but chose not to delegate.
141 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain.
142 // 4. Loading was attempted, but there was a linkage error of some sort.
143 // In all of these cases, the loader constraints on this type are
144 // satisfied, and it is safe for classes in the given class loader
145 // to manipulate strongly-typed values of the found class, subject
218 static void verify();
219
220 #ifdef ASSERT
221 static bool is_internal_format(symbolHandle class_name);
222 #endif
223
224 // Verify class is in dictionary
225 static void verify_obj_klass_present(Handle obj,
226 symbolHandle class_name,
227 Handle class_loader);
228
229 // Initialization
230 static void initialize(TRAPS);
231
232 // Fast access to commonly used classes (preloaded)
233 static klassOop check_klass(klassOop k) {
234 assert(k != NULL, "preloaded klass not initialized");
235 return k;
236 }
237
238 public:
239 static klassOop object_klass() { return check_klass(_object_klass); }
240 static klassOop string_klass() { return check_klass(_string_klass); }
241 static klassOop class_klass() { return check_klass(_class_klass); }
242 static klassOop cloneable_klass() { return check_klass(_cloneable_klass); }
243 static klassOop classloader_klass() { return check_klass(_classloader_klass); }
244 static klassOop serializable_klass() { return check_klass(_serializable_klass); }
245 static klassOop system_klass() { return check_klass(_system_klass); }
246
247 static klassOop throwable_klass() { return check_klass(_throwable_klass); }
248 static klassOop error_klass() { return check_klass(_error_klass); }
249 static klassOop threaddeath_klass() { return check_klass(_threaddeath_klass); }
250 static klassOop exception_klass() { return check_klass(_exception_klass); }
251 static klassOop runtime_exception_klass() { return check_klass(_runtime_exception_klass); }
252 static klassOop classNotFoundException_klass() { return check_klass(_classNotFoundException_klass); }
253 static klassOop noClassDefFoundError_klass() { return check_klass(_noClassDefFoundError_klass); }
254 static klassOop linkageError_klass() { return check_klass(_linkageError_klass); }
255 static klassOop ClassCastException_klass() { return check_klass(_classCastException_klass); }
256 static klassOop ArrayStoreException_klass() { return check_klass(_arrayStoreException_klass); }
257 static klassOop virtualMachineError_klass() { return check_klass(_virtualMachineError_klass); }
258 static klassOop OutOfMemoryError_klass() { return check_klass(_outOfMemoryError_klass); }
259 static klassOop StackOverflowError_klass() { return check_klass(_StackOverflowError_klass); }
260 static klassOop IllegalMonitorStateException_klass() { return check_klass(_illegalMonitorStateException_klass); }
261 static klassOop protectionDomain_klass() { return check_klass(_protectionDomain_klass); }
262 static klassOop AccessControlContext_klass() { return check_klass(_AccessControlContext_klass); }
263 static klassOop reference_klass() { return check_klass(_reference_klass); }
264 static klassOop soft_reference_klass() { return check_klass(_soft_reference_klass); }
265 static klassOop weak_reference_klass() { return check_klass(_weak_reference_klass); }
266 static klassOop final_reference_klass() { return check_klass(_final_reference_klass); }
267 static klassOop phantom_reference_klass() { return check_klass(_phantom_reference_klass); }
268 static klassOop finalizer_klass() { return check_klass(_finalizer_klass); }
269
270 static klassOop thread_klass() { return check_klass(_thread_klass); }
271 static klassOop threadGroup_klass() { return check_klass(_threadGroup_klass); }
272 static klassOop properties_klass() { return check_klass(_properties_klass); }
273 static klassOop reflect_accessible_object_klass() { return check_klass(_reflect_accessible_object_klass); }
274 static klassOop reflect_field_klass() { return check_klass(_reflect_field_klass); }
275 static klassOop reflect_method_klass() { return check_klass(_reflect_method_klass); }
276 static klassOop reflect_constructor_klass() { return check_klass(_reflect_constructor_klass); }
277 static klassOop reflect_method_accessor_klass() {
278 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only");
279 return check_klass(_reflect_method_accessor_klass);
280 }
281 static klassOop reflect_constructor_accessor_klass() {
282 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only");
283 return check_klass(_reflect_constructor_accessor_klass);
284 }
285 // NOTE: needed too early in bootstrapping process to have checks based on JDK version
286 static klassOop reflect_magic_klass() { return _reflect_magic_klass; }
287 static klassOop reflect_delegating_classloader_klass() { return _reflect_delegating_classloader_klass; }
288 static klassOop reflect_constant_pool_klass() {
289 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only");
290 return _reflect_constant_pool_klass;
291 }
292 static klassOop reflect_unsafe_static_field_accessor_impl_klass() {
293 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only");
294 return _reflect_unsafe_static_field_accessor_impl_klass;
295 }
296
297 static klassOop vector_klass() { return check_klass(_vector_klass); }
298 static klassOop hashtable_klass() { return check_klass(_hashtable_klass); }
299 static klassOop stringBuffer_klass() { return check_klass(_stringBuffer_klass); }
300 static klassOop stackTraceElement_klass() { return check_klass(_stackTraceElement_klass); }
301
302 static klassOop java_nio_Buffer_klass() { return check_klass(_java_nio_Buffer_klass); }
303
304 static klassOop sun_misc_AtomicLongCSImpl_klass() { return _sun_misc_AtomicLongCSImpl_klass; }
305
306 // To support incremental JRE downloads (KERNEL JRE). Null if not present.
307 static klassOop sun_jkernel_DownloadManager_klass() { return _sun_jkernel_DownloadManager_klass; }
308
309 static klassOop boolean_klass() { return check_klass(_boolean_klass); }
310 static klassOop char_klass() { return check_klass(_char_klass); }
311 static klassOop float_klass() { return check_klass(_float_klass); }
312 static klassOop double_klass() { return check_klass(_double_klass); }
313 static klassOop byte_klass() { return check_klass(_byte_klass); }
314 static klassOop short_klass() { return check_klass(_short_klass); }
315 static klassOop int_klass() { return check_klass(_int_klass); }
316 static klassOop long_klass() { return check_klass(_long_klass); }
317
318 static klassOop box_klass(BasicType t) {
319 assert((uint)t < T_VOID+1, "range check");
320 return check_klass(_box_klasses[t]);
321 }
322 static BasicType box_klass_type(klassOop k); // inverse of box_klass
323
324 // methods returning lazily loaded klasses
325 // The corresponding method to load the class must be called before calling them.
326 static klassOop abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); }
327
328 static void load_abstract_ownable_synchronizer_klass(TRAPS);
329
330 private:
331 // Tells whether ClassLoader.loadClassInternal is present
332 static bool has_loadClassInternal() { return _has_loadClassInternal; }
333
334 public:
335 // Tells whether ClassLoader.checkPackageAccess is present
336 static bool has_checkPackageAccess() { return _has_checkPackageAccess; }
337
338 static bool class_klass_loaded() { return _class_klass != NULL; }
339 static bool cloneable_klass_loaded() { return _cloneable_klass != NULL; }
340
341 // Returns default system loader
342 static oop java_system_loader();
343
344 // Compute the default system loader
345 static void compute_java_system_loader(TRAPS);
346
347 private:
348 // Mirrors for primitive classes (created eagerly)
349 static oop check_mirror(oop m) {
350 assert(m != NULL, "mirror not initialized");
351 return m;
352 }
353
354 public:
355 // Note: java_lang_Class::primitive_type is the inverse of java_mirror
356
357 // Check class loader constraints
358 static bool add_loader_constraint(symbolHandle name, Handle loader1,
359 Handle loader2, TRAPS);
481
482 // Performs cleanups after resolve_super_or_fail. This typically needs
483 // to be called on failure.
484 // Won't throw, but can block.
485 static void resolution_cleanups(symbolHandle class_name,
486 Handle class_loader,
487 TRAPS);
488
489 // Initialization
490 static void initialize_preloaded_classes(TRAPS);
491
492 // Class loader constraints
493 static void check_constraints(int index, unsigned int hash,
494 instanceKlassHandle k, Handle loader,
495 bool defining, TRAPS);
496 static void update_dictionary(int d_index, unsigned int d_hash,
497 int p_index, unsigned int p_hash,
498 instanceKlassHandle k, Handle loader, TRAPS);
499
500 // Variables holding commonly used klasses (preloaded)
501 static klassOop _object_klass;
502 static klassOop _string_klass;
503 static klassOop _class_klass;
504 static klassOop _cloneable_klass;
505 static klassOop _classloader_klass;
506 static klassOop _serializable_klass;
507 static klassOop _system_klass;
508
509 static klassOop _throwable_klass;
510 static klassOop _error_klass;
511 static klassOop _threaddeath_klass;
512 static klassOop _exception_klass;
513 static klassOop _runtime_exception_klass;
514 static klassOop _classNotFoundException_klass;
515 static klassOop _noClassDefFoundError_klass;
516 static klassOop _linkageError_klass;
517 static klassOop _classCastException_klass;
518 static klassOop _arrayStoreException_klass;
519 static klassOop _virtualMachineError_klass;
520 static klassOop _outOfMemoryError_klass;
521 static klassOop _StackOverflowError_klass;
522 static klassOop _illegalMonitorStateException_klass;
523 static klassOop _protectionDomain_klass;
524 static klassOop _AccessControlContext_klass;
525 static klassOop _reference_klass;
526 static klassOop _soft_reference_klass;
527 static klassOop _weak_reference_klass;
528 static klassOop _final_reference_klass;
529 static klassOop _phantom_reference_klass;
530 static klassOop _finalizer_klass;
531
532 static klassOop _thread_klass;
533 static klassOop _threadGroup_klass;
534 static klassOop _properties_klass;
535 static klassOop _reflect_accessible_object_klass;
536 static klassOop _reflect_field_klass;
537 static klassOop _reflect_method_klass;
538 static klassOop _reflect_constructor_klass;
539 // 1.4 reflection implementation
540 static klassOop _reflect_magic_klass;
541 static klassOop _reflect_method_accessor_klass;
542 static klassOop _reflect_constructor_accessor_klass;
543 static klassOop _reflect_delegating_classloader_klass;
544 // 1.5 annotations implementation
545 static klassOop _reflect_constant_pool_klass;
546 static klassOop _reflect_unsafe_static_field_accessor_impl_klass;
547
548 static klassOop _stringBuffer_klass;
549 static klassOop _vector_klass;
550 static klassOop _hashtable_klass;
551
552 static klassOop _stackTraceElement_klass;
553
554 static klassOop _java_nio_Buffer_klass;
555
556 static klassOop _sun_misc_AtomicLongCSImpl_klass;
557
558 // KERNEL JRE support.
559 static klassOop _sun_jkernel_DownloadManager_klass;
560
561 // Lazily loaded klasses
562 static volatile klassOop _abstract_ownable_synchronizer_klass;
563
564 // Box klasses
565 static klassOop _boolean_klass;
566 static klassOop _char_klass;
567 static klassOop _float_klass;
568 static klassOop _double_klass;
569 static klassOop _byte_klass;
570 static klassOop _short_klass;
571 static klassOop _int_klass;
572 static klassOop _long_klass;
573
574 // table of same
575 static klassOop _box_klasses[T_VOID+1];
576
577 static oop _java_system_loader;
578
579 static bool _has_loadClassInternal;
580 static bool _has_checkPackageAccess;
581 };
|
47 // Clients of this class who are interested in finding if a class has
48 // been completely loaded -- not classes in the process of being loaded --
49 // can read the SystemDictionary unlocked. This is safe because
50 // - entries are only deleted at safepoints
51 // - readers cannot come to a safepoint while actively examining
52 // an entry (an entry cannot be deleted from under a reader)
53 // - entries must be fully formed before they are available to concurrent
54 // readers (we must ensure write ordering)
55 //
56 // Note that placeholders are deleted at any time, as they are removed
57 // when a class is completely loaded. Therefore, readers as well as writers
58 // of placeholders must hold the SystemDictionary_lock.
59 //
60
61 class Dictionary;
62 class PlaceholderTable;
63 class LoaderConstraintTable;
64 class HashtableBucket;
65 class ResolutionErrorTable;
66
67 // Certain classes are preloaded, such as java.lang.Object and java.lang.String.
68 // They are all "well-known", in the sense that no class loader is allowed
69 // to provide a different definition.
70 //
71 // These klasses must all have names defined in vmSymbols.
72
73 #define WK_KLASS_ENUM_NAME(kname) kname##_knum
74
75 // Each well-known class has a short klass name (like object_klass),
76 // a vmSymbol name (like java_lang_Object), and a flag word
77 // that makes some minor distinctions, like whether the klass
78 // is preloaded, optional, release-specific, etc.
79 // The order of these definitions is significant; it is the order in which
80 // preloading is actually performed by initialize_preloaded_classes.
81
82 #define WK_KLASSES_DO(template) \
83 /* well-known classes */ \
84 template(object_klass, java_lang_Object, Pre) \
85 template(string_klass, java_lang_String, Pre) \
86 template(class_klass, java_lang_Class, Pre) \
87 template(cloneable_klass, java_lang_Cloneable, Pre) \
88 template(classloader_klass, java_lang_ClassLoader, Pre) \
89 template(serializable_klass, java_io_Serializable, Pre) \
90 template(system_klass, java_lang_System, Pre) \
91 template(throwable_klass, java_lang_Throwable, Pre) \
92 template(error_klass, java_lang_Error, Pre) \
93 template(threaddeath_klass, java_lang_ThreadDeath, Pre) \
94 template(exception_klass, java_lang_Exception, Pre) \
95 template(runtime_exception_klass, java_lang_RuntimeException, Pre) \
96 template(protectionDomain_klass, java_security_ProtectionDomain, Pre) \
97 template(AccessControlContext_klass, java_security_AccessControlContext, Pre) \
98 template(classNotFoundException_klass, java_lang_ClassNotFoundException, Pre) \
99 template(noClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre) \
100 template(linkageError_klass, java_lang_LinkageError, Pre) \
101 template(ClassCastException_klass, java_lang_ClassCastException, Pre) \
102 template(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre) \
103 template(virtualMachineError_klass, java_lang_VirtualMachineError, Pre) \
104 template(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre) \
105 template(StackOverflowError_klass, java_lang_StackOverflowError, Pre) \
106 template(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre) \
107 template(reference_klass, java_lang_ref_Reference, Pre) \
108 \
109 /* Preload ref klasses and set reference types */ \
110 template(soft_reference_klass, java_lang_ref_SoftReference, Pre) \
111 template(weak_reference_klass, java_lang_ref_WeakReference, Pre) \
112 template(final_reference_klass, java_lang_ref_FinalReference, Pre) \
113 template(phantom_reference_klass, java_lang_ref_PhantomReference, Pre) \
114 template(finalizer_klass, java_lang_ref_Finalizer, Pre) \
115 \
116 template(thread_klass, java_lang_Thread, Pre) \
117 template(threadGroup_klass, java_lang_ThreadGroup, Pre) \
118 template(properties_klass, java_util_Properties, Pre) \
119 template(reflect_accessible_object_klass, java_lang_reflect_AccessibleObject, Pre) \
120 template(reflect_field_klass, java_lang_reflect_Field, Pre) \
121 template(reflect_method_klass, java_lang_reflect_Method, Pre) \
122 template(reflect_constructor_klass, java_lang_reflect_Constructor, Pre) \
123 \
124 /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \
125 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
126 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
127 template(reflect_magic_klass, sun_reflect_MagicAccessorImpl, Opt) \
128 template(reflect_method_accessor_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \
129 template(reflect_constructor_accessor_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \
130 template(reflect_delegating_classloader_klass, sun_reflect_DelegatingClassLoader, Opt) \
131 template(reflect_constant_pool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15) \
132 template(reflect_unsafe_static_field_accessor_impl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15) \
133 \
134 template(vector_klass, java_util_Vector, Pre) \
135 template(hashtable_klass, java_util_Hashtable, Pre) \
136 template(stringBuffer_klass, java_lang_StringBuffer, Pre) \
137 \
138 /* It's NULL in non-1.4 JDKs. */ \
139 template(stackTraceElement_klass, java_lang_StackTraceElement, Opt) \
140 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
141 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
142 template(java_nio_Buffer_klass, java_nio_Buffer, Opt) \
143 \
144 /* If this class isn't present, it won't be referenced. */ \
145 template(sun_misc_AtomicLongCSImpl_klass, sun_misc_AtomicLongCSImpl, Opt) \
146 \
147 /* Preload boxing klasses */ \
148 template(boolean_klass, java_lang_Boolean, Pre) \
149 template(char_klass, java_lang_Character, Pre) \
150 template(float_klass, java_lang_Float, Pre) \
151 template(double_klass, java_lang_Double, Pre) \
152 template(byte_klass, java_lang_Byte, Pre) \
153 template(short_klass, java_lang_Short, Pre) \
154 template(int_klass, java_lang_Integer, Pre) \
155 template(long_klass, java_lang_Long, Pre) \
156 /*end*/
157
158
159 class SystemDictionary : AllStatic {
160 friend class VMStructs;
161 friend class CompactingPermGenGen;
162 NOT_PRODUCT(friend class instanceKlassKlass;)
163
164 public:
165 enum WKID {
166 NO_WKID = 0,
167
168 #define WK_KLASS_ENUM(name, ignore_s, ignore_o) WK_KLASS_ENUM_NAME(name),
169 WK_KLASSES_DO(WK_KLASS_ENUM)
170 #undef WK_KLASS_ENUM
171
172 WKID_LIMIT,
173
174 FIRST_WKID = NO_WKID + 1
175 };
176
177 enum InitOption {
178 Pre, // preloaded; error if not present
179
180 // Order is significant. Options before this point require resolve_or_fail.
181 // Options after this point will use resolve_or_null instead.
182
183 Opt, // preload tried; NULL if not present
184 Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection
185 Opt_Only_JDK15 // preload tried; use only with JDK1.5+
186 };
187
188
189 // Returns a class with a given class name and class loader. Loads the
190 // class if needed. If not found a NoClassDefFoundError or a
191 // ClassNotFoundException is thrown, depending on the value on the
192 // throw_error flag. For most uses the throw_error argument should be set
193 // to true.
194
195 static klassOop resolve_or_fail(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS);
196 // Convenient call for null loader and protection domain.
197 static klassOop resolve_or_fail(symbolHandle class_name, bool throw_error, TRAPS);
198 private:
199 // handle error translation for resolve_or_null results
200 static klassOop handle_resolution_exception(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS);
201
202 public:
203
204 // Returns a class with a given class name and class loader.
205 // Loads the class if needed. If not found NULL is returned.
206 static klassOop resolve_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS);
207 // Version with null loader and protection domain
208 static klassOop resolve_or_null(symbolHandle class_name, TRAPS);
222 static klassOop parse_stream(symbolHandle class_name,
223 Handle class_loader,
224 Handle protection_domain,
225 ClassFileStream* st,
226 TRAPS);
227
228 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass)
229 static klassOop resolve_from_stream(symbolHandle class_name, Handle class_loader, Handle protection_domain, ClassFileStream* st, TRAPS);
230
231 // Lookup an already loaded class. If not found NULL is returned.
232 static klassOop find(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS);
233
234 // Lookup an already loaded instance or array class.
235 // Do not make any queries to class loaders; consult only the cache.
236 // If not found NULL is returned.
237 static klassOop find_instance_or_array_klass(symbolHandle class_name,
238 Handle class_loader,
239 Handle protection_domain,
240 TRAPS);
241
242 // If the given name is known to vmSymbols, return the well-know klass:
243 static klassOop find_well_known_klass(symbolOop class_name);
244
245 // Lookup an instance or array class that has already been loaded
246 // either into the given class loader, or else into another class
247 // loader that is constrained (via loader constraints) to produce
248 // a consistent class. Do not take protection domains into account.
249 // Do not make any queries to class loaders; consult only the cache.
250 // Return NULL if the class is not found.
251 //
252 // This function is a strict superset of find_instance_or_array_klass.
253 // This function (the unchecked version) makes a conservative prediction
254 // of the result of the checked version, assuming successful lookup.
255 // If both functions return non-null, they must return the same value.
256 // Also, the unchecked version may sometimes be non-null where the
257 // checked version is null. This can occur in several ways:
258 // 1. No query has yet been made to the class loader.
259 // 2. The class loader was queried, but chose not to delegate.
260 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain.
261 // 4. Loading was attempted, but there was a linkage error of some sort.
262 // In all of these cases, the loader constraints on this type are
263 // satisfied, and it is safe for classes in the given class loader
264 // to manipulate strongly-typed values of the found class, subject
337 static void verify();
338
339 #ifdef ASSERT
340 static bool is_internal_format(symbolHandle class_name);
341 #endif
342
343 // Verify class is in dictionary
344 static void verify_obj_klass_present(Handle obj,
345 symbolHandle class_name,
346 Handle class_loader);
347
348 // Initialization
349 static void initialize(TRAPS);
350
351 // Fast access to commonly used classes (preloaded)
352 static klassOop check_klass(klassOop k) {
353 assert(k != NULL, "preloaded klass not initialized");
354 return k;
355 }
356
357 static klassOop check_klass_Pre(klassOop k) { return check_klass(k); }
358 static klassOop check_klass_Opt(klassOop k) { return k; }
359 static klassOop check_klass_Opt_Only_JDK15(klassOop k) {
360 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only");
361 return k;
362 }
363 static klassOop check_klass_Opt_Only_JDK14NewRef(klassOop k) {
364 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only");
365 // despite the optional loading, if you use this it must be present:
366 return check_klass(k);
367 }
368
369 static bool initialize_wk_klass(WKID id, bool must_load, TRAPS);
370 static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS);
371 static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) {
372 int limit = (int)end_id + 1;
373 initialize_wk_klasses_until((WKID) limit, start_id, THREAD);
374 }
375
376 public:
377 #define WK_KLASS_DECLARE(name, ignore_symbol, option) \
378 static klassOop name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); }
379 WK_KLASSES_DO(WK_KLASS_DECLARE);
380 #undef WK_KLASS_DECLARE
381
382 // Local definition for direct access to the private array:
383 #define WK_KLASS(name) _well_known_klasses[WK_KLASS_ENUM_NAME(name)]
384
385 static klassOop box_klass(BasicType t) {
386 assert((uint)t < T_VOID+1, "range check");
387 return check_klass(_box_klasses[t]);
388 }
389 static BasicType box_klass_type(klassOop k); // inverse of box_klass
390
391 // methods returning lazily loaded klasses
392 // The corresponding method to load the class must be called before calling them.
393 static klassOop abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); }
394
395 static void load_abstract_ownable_synchronizer_klass(TRAPS);
396
397 private:
398 // Tells whether ClassLoader.loadClassInternal is present
399 static bool has_loadClassInternal() { return _has_loadClassInternal; }
400
401 public:
402 // Tells whether ClassLoader.checkPackageAccess is present
403 static bool has_checkPackageAccess() { return _has_checkPackageAccess; }
404
405 static bool class_klass_loaded() { return WK_KLASS(class_klass) != NULL; }
406 static bool cloneable_klass_loaded() { return WK_KLASS(cloneable_klass) != NULL; }
407
408 // Returns default system loader
409 static oop java_system_loader();
410
411 // Compute the default system loader
412 static void compute_java_system_loader(TRAPS);
413
414 private:
415 // Mirrors for primitive classes (created eagerly)
416 static oop check_mirror(oop m) {
417 assert(m != NULL, "mirror not initialized");
418 return m;
419 }
420
421 public:
422 // Note: java_lang_Class::primitive_type is the inverse of java_mirror
423
424 // Check class loader constraints
425 static bool add_loader_constraint(symbolHandle name, Handle loader1,
426 Handle loader2, TRAPS);
548
549 // Performs cleanups after resolve_super_or_fail. This typically needs
550 // to be called on failure.
551 // Won't throw, but can block.
552 static void resolution_cleanups(symbolHandle class_name,
553 Handle class_loader,
554 TRAPS);
555
556 // Initialization
557 static void initialize_preloaded_classes(TRAPS);
558
559 // Class loader constraints
560 static void check_constraints(int index, unsigned int hash,
561 instanceKlassHandle k, Handle loader,
562 bool defining, TRAPS);
563 static void update_dictionary(int d_index, unsigned int d_hash,
564 int p_index, unsigned int p_hash,
565 instanceKlassHandle k, Handle loader, TRAPS);
566
567 // Variables holding commonly used klasses (preloaded)
568 static klassOop _well_known_klasses[];
569
570 // Lazily loaded klasses
571 static volatile klassOop _abstract_ownable_synchronizer_klass;
572
573 // table of box klasses (int_klass, etc.)
574 static klassOop _box_klasses[T_VOID+1];
575
576 static oop _java_system_loader;
577
578 static bool _has_loadClassInternal;
579 static bool _has_checkPackageAccess;
580 };
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