77 class ResolutionErrorTable;
78 class SymbolPropertyTable;
79
80 // Certain classes are preloaded, such as java.lang.Object and java.lang.String.
81 // They are all "well-known", in the sense that no class loader is allowed
82 // to provide a different definition.
83 //
84 // These klasses must all have names defined in vmSymbols.
85
86 #define WK_KLASS_ENUM_NAME(kname) kname##_knum
87
88 // Each well-known class has a short klass name (like object_klass),
89 // a vmSymbol name (like java_lang_Object), and a flag word
90 // that makes some minor distinctions, like whether the klass
91 // is preloaded, optional, release-specific, etc.
92 // The order of these definitions is significant; it is the order in which
93 // preloading is actually performed by initialize_preloaded_classes.
94
95 #define WK_KLASSES_DO(do_klass) \
96 /* well-known classes */ \
97 do_klass(Object_klass, java_lang_Object, Pre_Link ) \
98 do_klass(String_klass, java_lang_String, Pre_Link ) \
99 do_klass(Class_klass, java_lang_Class, Pre_Link ) \
100 do_klass(Cloneable_klass, java_lang_Cloneable, Pre_Link ) \
101 do_klass(ClassLoader_klass, java_lang_ClassLoader, Pre_Link ) \
102 do_klass(Serializable_klass, java_io_Serializable, Pre_Link ) \
103 do_klass(System_klass, java_lang_System, Pre_Link ) \
104 do_klass(Throwable_klass, java_lang_Throwable, Pre_Link ) \
105 do_klass(Error_klass, java_lang_Error, Pre_Link ) \
106 do_klass(ThreadDeath_klass, java_lang_ThreadDeath, Pre_Link ) \
107 do_klass(Exception_klass, java_lang_Exception, Pre_Link ) \
108 do_klass(RuntimeException_klass, java_lang_RuntimeException, Pre_Link ) \
109 do_klass(ProtectionDomain_klass, java_security_ProtectionDomain, Pre_Link ) \
110 do_klass(AccessControlContext_klass, java_security_AccessControlContext, Pre_Link ) \
111 do_klass(ClassNotFoundException_klass, java_lang_ClassNotFoundException, Pre_Link ) \
112 do_klass(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre_Link ) \
113 do_klass(LinkageError_klass, java_lang_LinkageError, Pre_Link ) \
114 do_klass(ClassCastException_klass, java_lang_ClassCastException, Pre_Link ) \
115 do_klass(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre_Link ) \
116 do_klass(VirtualMachineError_klass, java_lang_VirtualMachineError, Pre_Link ) \
117 do_klass(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre_Link ) \
118 do_klass(StackOverflowError_klass, java_lang_StackOverflowError, Pre_Link ) \
119 do_klass(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre_Link ) \
120 do_klass(Reference_klass, java_lang_ref_Reference, Pre_Link ) \
121 \
122 /* Preload ref klasses and set reference types */ \
123 do_klass(SoftReference_klass, java_lang_ref_SoftReference, Pre_Link ) \
124 do_klass(WeakReference_klass, java_lang_ref_WeakReference, Pre_Link ) \
125 do_klass(FinalReference_klass, java_lang_ref_FinalReference, Pre ) \
126 do_klass(PhantomReference_klass, java_lang_ref_PhantomReference, Pre_Link ) \
127 do_klass(Finalizer_klass, java_lang_ref_Finalizer, Pre ) \
128 \
129 do_klass(Thread_klass, java_lang_Thread, Pre_Link ) \
130 do_klass(ThreadGroup_klass, java_lang_ThreadGroup, Pre_Link ) \
131 do_klass(Properties_klass, java_util_Properties, Pre_Link ) \
132 do_klass(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject, Pre_Link ) \
133 do_klass(reflect_Field_klass, java_lang_reflect_Field, Pre_Link ) \
134 do_klass(reflect_Method_klass, java_lang_reflect_Method, Pre_Link ) \
135 do_klass(reflect_Constructor_klass, java_lang_reflect_Constructor, Pre_Link ) \
136 \
137 /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \
138 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
139 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
140 do_klass(reflect_MagicAccessorImpl_klass, sun_reflect_MagicAccessorImpl, Opt ) \
141 do_klass(reflect_MethodAccessorImpl_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \
142 do_klass(reflect_ConstructorAccessorImpl_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \
143 do_klass(reflect_DelegatingClassLoader_klass, sun_reflect_DelegatingClassLoader, Opt ) \
144 do_klass(reflect_ConstantPool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15 ) \
145 do_klass(reflect_UnsafeStaticFieldAccessorImpl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15 ) \
146 \
147 /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \
148 do_klass(MethodHandle_klass, java_lang_invoke_MethodHandle, Pre_Link ) \
149 do_klass(MemberName_klass, java_lang_invoke_MemberName, Pre ) \
150 do_klass(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives, Pre ) \
151 do_klass(LambdaForm_klass, java_lang_invoke_LambdaForm, Opt ) \
152 do_klass(MethodType_klass, java_lang_invoke_MethodType, Pre_Link ) \
153 do_klass(BootstrapMethodError_klass, java_lang_BootstrapMethodError, Pre_Link ) \
154 do_klass(CallSite_klass, java_lang_invoke_CallSite, Pre_Link ) \
155 do_klass(ConstantCallSite_klass, java_lang_invoke_ConstantCallSite, Pre_Link ) \
156 do_klass(MutableCallSite_klass, java_lang_invoke_MutableCallSite, Pre_Link ) \
157 do_klass(VolatileCallSite_klass, java_lang_invoke_VolatileCallSite, Pre_Link ) \
158 /* Note: MethodHandle must be first, and VolatileCallSite last in group */ \
159 \
160 do_klass(StringBuffer_klass, java_lang_StringBuffer, Pre_Link ) \
161 do_klass(StringBuilder_klass, java_lang_StringBuilder, Pre_Link ) \
162 \
163 /* It's NULL in non-1.4 JDKs. */ \
164 do_klass(StackTraceElement_klass, java_lang_StackTraceElement, Opt ) \
165 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
166 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
167 do_klass(nio_Buffer_klass, java_nio_Buffer, Opt ) \
168 \
169 do_klass(DownloadManager_klass, sun_jkernel_DownloadManager, Opt_Kernel ) \
170 \
171 do_klass(PostVMInitHook_klass, sun_misc_PostVMInitHook, Opt ) \
172 \
173 /* Preload boxing klasses */ \
174 do_klass(Boolean_klass, java_lang_Boolean, Pre_Link ) \
175 do_klass(Character_klass, java_lang_Character, Pre_Link ) \
176 do_klass(Float_klass, java_lang_Float, Pre_Link ) \
177 do_klass(Double_klass, java_lang_Double, Pre_Link ) \
178 do_klass(Byte_klass, java_lang_Byte, Pre_Link ) \
179 do_klass(Short_klass, java_lang_Short, Pre_Link ) \
180 do_klass(Integer_klass, java_lang_Integer, Pre_Link ) \
181 do_klass(Long_klass, java_lang_Long, Pre_Link ) \
182 /*end*/
183
184
185 class SystemDictionary : AllStatic {
186 friend class VMStructs;
187 friend class SystemDictionaryHandles;
188
189 public:
190 enum WKID {
191 NO_WKID = 0,
192
193 #define WK_KLASS_ENUM(name, symbol, ignore_o) WK_KLASS_ENUM_NAME(name), WK_KLASS_ENUM_NAME(symbol) = WK_KLASS_ENUM_NAME(name),
194 WK_KLASSES_DO(WK_KLASS_ENUM)
195 #undef WK_KLASS_ENUM
196
197 WKID_LIMIT,
198
199 FIRST_WKID = NO_WKID + 1
200 };
201
202 enum InitOption {
203 Pre, // preloaded; error if not present
204 Pre_Link, // preloaded; error if not present; link as well-known
205
206 // Order is significant. Options before this point require resolve_or_fail.
207 // Options after this point will use resolve_or_null instead.
208
209 Opt, // preload tried; NULL if not present
210 Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection
211 Opt_Only_JDK15, // preload tried; use only with JDK1.5+
212 Opt_Kernel, // preload tried only #ifdef KERNEL
213 OPTION_LIMIT,
214 CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT)
215 };
216
217
218 // Returns a class with a given class name and class loader. Loads the
219 // class if needed. If not found a NoClassDefFoundError or a
220 // ClassNotFoundException is thrown, depending on the value on the
221 // throw_error flag. For most uses the throw_error argument should be set
222 // to true.
223
224 static Klass* resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS);
263 KlassHandle host_klass,
264 GrowableArray<Handle>* cp_patches,
265 TRAPS);
266
267 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass)
268 static Klass* resolve_from_stream(Symbol* class_name, Handle class_loader,
269 Handle protection_domain,
270 ClassFileStream* st, bool verify, TRAPS);
271
272 // Lookup an already loaded class. If not found NULL is returned.
273 static Klass* find(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
274
275 // Lookup an already loaded instance or array class.
276 // Do not make any queries to class loaders; consult only the cache.
277 // If not found NULL is returned.
278 static Klass* find_instance_or_array_klass(Symbol* class_name,
279 Handle class_loader,
280 Handle protection_domain,
281 TRAPS);
282
283 // If the given name is known to vmSymbols, return the well-know klass:
284 static Klass* find_well_known_klass(Symbol* class_name);
285
286 // Lookup an instance or array class that has already been loaded
287 // either into the given class loader, or else into another class
288 // loader that is constrained (via loader constraints) to produce
289 // a consistent class. Do not take protection domains into account.
290 // Do not make any queries to class loaders; consult only the cache.
291 // Return NULL if the class is not found.
292 //
293 // This function is a strict superset of find_instance_or_array_klass.
294 // This function (the unchecked version) makes a conservative prediction
295 // of the result of the checked version, assuming successful lookup.
296 // If both functions return non-null, they must return the same value.
297 // Also, the unchecked version may sometimes be non-null where the
298 // checked version is null. This can occur in several ways:
299 // 1. No query has yet been made to the class loader.
300 // 2. The class loader was queried, but chose not to delegate.
301 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain.
302 // 4. Loading was attempted, but there was a linkage error of some sort.
303 // In all of these cases, the loader constraints on this type are
304 // satisfied, and it is safe for classes in the given class loader
305 // to manipulate strongly-typed values of the found class, subject
376 static void verify();
377
378 #ifdef ASSERT
379 static bool is_internal_format(Symbol* class_name);
380 #endif
381
382 // Verify class is in dictionary
383 static void verify_obj_klass_present(Symbol* class_name,
384 ClassLoaderData* loader_data);
385
386 // Initialization
387 static void initialize(TRAPS);
388
389 // Fast access to commonly used classes (preloaded)
390 static Klass* check_klass(Klass* k) {
391 assert(k != NULL, "preloaded klass not initialized");
392 return k;
393 }
394
395 static Klass* check_klass_Pre( Klass* k) { return check_klass(k); }
396 static Klass* check_klass_Pre_Link( Klass* k) { return check_klass(k); }
397 static Klass* check_klass_Opt( Klass* k) { return k; }
398 static Klass* check_klass_Opt_Kernel(Klass* k) { return k; } //== Opt
399 static Klass* check_klass_Opt_Only_JDK15(Klass* k) {
400 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only");
401 return k;
402 }
403 static Klass* check_klass_Opt_Only_JDK14NewRef(Klass* k) {
404 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only");
405 // despite the optional loading, if you use this it must be present:
406 return check_klass(k);
407 }
408
409 static bool initialize_wk_klass(WKID id, int init_opt, TRAPS);
410 static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS);
411 static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) {
412 int limit = (int)end_id + 1;
413 initialize_wk_klasses_until((WKID) limit, start_id, THREAD);
414 }
415
416 static void check_wk_pre_link_klasses() NOT_DEBUG_RETURN;
417
418 public:
419 #define WK_KLASS_DECLARE(name, symbol, option) \
420 static Klass* name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } \
421 static Klass** name##_addr() { \
422 return &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \
423 }
424 WK_KLASSES_DO(WK_KLASS_DECLARE);
425 #undef WK_KLASS_DECLARE
426
427 static Klass* well_known_klass(WKID id) {
428 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob");
429 return _well_known_klasses[id];
430 }
431
432 static Klass** well_known_klass_addr(WKID id) {
433 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob");
434 return &_well_known_klasses[id];
435 }
436
437 // Local definition for direct access to the private array:
|
77 class ResolutionErrorTable;
78 class SymbolPropertyTable;
79
80 // Certain classes are preloaded, such as java.lang.Object and java.lang.String.
81 // They are all "well-known", in the sense that no class loader is allowed
82 // to provide a different definition.
83 //
84 // These klasses must all have names defined in vmSymbols.
85
86 #define WK_KLASS_ENUM_NAME(kname) kname##_knum
87
88 // Each well-known class has a short klass name (like object_klass),
89 // a vmSymbol name (like java_lang_Object), and a flag word
90 // that makes some minor distinctions, like whether the klass
91 // is preloaded, optional, release-specific, etc.
92 // The order of these definitions is significant; it is the order in which
93 // preloading is actually performed by initialize_preloaded_classes.
94
95 #define WK_KLASSES_DO(do_klass) \
96 /* well-known classes */ \
97 do_klass(Object_klass, java_lang_Object, Pre ) \
98 do_klass(String_klass, java_lang_String, Pre ) \
99 do_klass(Class_klass, java_lang_Class, Pre ) \
100 do_klass(Cloneable_klass, java_lang_Cloneable, Pre ) \
101 do_klass(ClassLoader_klass, java_lang_ClassLoader, Pre ) \
102 do_klass(Serializable_klass, java_io_Serializable, Pre ) \
103 do_klass(System_klass, java_lang_System, Pre ) \
104 do_klass(Throwable_klass, java_lang_Throwable, Pre ) \
105 do_klass(Error_klass, java_lang_Error, Pre ) \
106 do_klass(ThreadDeath_klass, java_lang_ThreadDeath, Pre ) \
107 do_klass(Exception_klass, java_lang_Exception, Pre ) \
108 do_klass(RuntimeException_klass, java_lang_RuntimeException, Pre ) \
109 do_klass(ProtectionDomain_klass, java_security_ProtectionDomain, Pre ) \
110 do_klass(AccessControlContext_klass, java_security_AccessControlContext, Pre ) \
111 do_klass(ClassNotFoundException_klass, java_lang_ClassNotFoundException, Pre ) \
112 do_klass(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre ) \
113 do_klass(LinkageError_klass, java_lang_LinkageError, Pre ) \
114 do_klass(ClassCastException_klass, java_lang_ClassCastException, Pre ) \
115 do_klass(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre ) \
116 do_klass(VirtualMachineError_klass, java_lang_VirtualMachineError, Pre ) \
117 do_klass(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre ) \
118 do_klass(StackOverflowError_klass, java_lang_StackOverflowError, Pre ) \
119 do_klass(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre ) \
120 do_klass(Reference_klass, java_lang_ref_Reference, Pre ) \
121 \
122 /* Preload ref klasses and set reference types */ \
123 do_klass(SoftReference_klass, java_lang_ref_SoftReference, Pre ) \
124 do_klass(WeakReference_klass, java_lang_ref_WeakReference, Pre ) \
125 do_klass(FinalReference_klass, java_lang_ref_FinalReference, Pre ) \
126 do_klass(PhantomReference_klass, java_lang_ref_PhantomReference, Pre ) \
127 do_klass(Finalizer_klass, java_lang_ref_Finalizer, Pre ) \
128 \
129 do_klass(Thread_klass, java_lang_Thread, Pre ) \
130 do_klass(ThreadGroup_klass, java_lang_ThreadGroup, Pre ) \
131 do_klass(Properties_klass, java_util_Properties, Pre ) \
132 do_klass(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject, Pre ) \
133 do_klass(reflect_Field_klass, java_lang_reflect_Field, Pre ) \
134 do_klass(reflect_Method_klass, java_lang_reflect_Method, Pre ) \
135 do_klass(reflect_Constructor_klass, java_lang_reflect_Constructor, Pre ) \
136 \
137 /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \
138 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
139 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
140 do_klass(reflect_MagicAccessorImpl_klass, sun_reflect_MagicAccessorImpl, Opt ) \
141 do_klass(reflect_MethodAccessorImpl_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \
142 do_klass(reflect_ConstructorAccessorImpl_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \
143 do_klass(reflect_DelegatingClassLoader_klass, sun_reflect_DelegatingClassLoader, Opt ) \
144 do_klass(reflect_ConstantPool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15 ) \
145 do_klass(reflect_UnsafeStaticFieldAccessorImpl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15 ) \
146 \
147 /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \
148 do_klass(MethodHandle_klass, java_lang_invoke_MethodHandle, Pre_JSR292 ) \
149 do_klass(MemberName_klass, java_lang_invoke_MemberName, Pre_JSR292 ) \
150 do_klass(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives, Pre_JSR292 ) \
151 do_klass(LambdaForm_klass, java_lang_invoke_LambdaForm, Opt ) \
152 do_klass(MethodType_klass, java_lang_invoke_MethodType, Pre_JSR292 ) \
153 do_klass(BootstrapMethodError_klass, java_lang_BootstrapMethodError, Pre_JSR292 ) \
154 do_klass(CallSite_klass, java_lang_invoke_CallSite, Pre_JSR292 ) \
155 do_klass(ConstantCallSite_klass, java_lang_invoke_ConstantCallSite, Pre_JSR292 ) \
156 do_klass(MutableCallSite_klass, java_lang_invoke_MutableCallSite, Pre_JSR292 ) \
157 do_klass(VolatileCallSite_klass, java_lang_invoke_VolatileCallSite, Pre_JSR292 ) \
158 /* Note: MethodHandle must be first, and VolatileCallSite last in group */ \
159 \
160 do_klass(StringBuffer_klass, java_lang_StringBuffer, Pre ) \
161 do_klass(StringBuilder_klass, java_lang_StringBuilder, Pre ) \
162 \
163 /* It's NULL in non-1.4 JDKs. */ \
164 do_klass(StackTraceElement_klass, java_lang_StackTraceElement, Opt ) \
165 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
166 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
167 do_klass(nio_Buffer_klass, java_nio_Buffer, Opt ) \
168 \
169 do_klass(DownloadManager_klass, sun_jkernel_DownloadManager, Opt_Kernel ) \
170 \
171 do_klass(PostVMInitHook_klass, sun_misc_PostVMInitHook, Opt ) \
172 \
173 /* Preload boxing klasses */ \
174 do_klass(Boolean_klass, java_lang_Boolean, Pre ) \
175 do_klass(Character_klass, java_lang_Character, Pre ) \
176 do_klass(Float_klass, java_lang_Float, Pre ) \
177 do_klass(Double_klass, java_lang_Double, Pre ) \
178 do_klass(Byte_klass, java_lang_Byte, Pre ) \
179 do_klass(Short_klass, java_lang_Short, Pre ) \
180 do_klass(Integer_klass, java_lang_Integer, Pre ) \
181 do_klass(Long_klass, java_lang_Long, Pre ) \
182 /*end*/
183
184
185 class SystemDictionary : AllStatic {
186 friend class VMStructs;
187 friend class SystemDictionaryHandles;
188
189 public:
190 enum WKID {
191 NO_WKID = 0,
192
193 #define WK_KLASS_ENUM(name, symbol, ignore_o) WK_KLASS_ENUM_NAME(name), WK_KLASS_ENUM_NAME(symbol) = WK_KLASS_ENUM_NAME(name),
194 WK_KLASSES_DO(WK_KLASS_ENUM)
195 #undef WK_KLASS_ENUM
196
197 WKID_LIMIT,
198
199 FIRST_WKID = NO_WKID + 1
200 };
201
202 enum InitOption {
203 Pre, // preloaded; error if not present
204 Pre_JSR292, // preloaded if EnableInvokeDynamic
205
206 // Order is significant. Options before this point require resolve_or_fail.
207 // Options after this point will use resolve_or_null instead.
208
209 Opt, // preload tried; NULL if not present
210 Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection
211 Opt_Only_JDK15, // preload tried; use only with JDK1.5+
212 Opt_Kernel, // preload tried only #ifdef KERNEL
213 OPTION_LIMIT,
214 CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT)
215 };
216
217
218 // Returns a class with a given class name and class loader. Loads the
219 // class if needed. If not found a NoClassDefFoundError or a
220 // ClassNotFoundException is thrown, depending on the value on the
221 // throw_error flag. For most uses the throw_error argument should be set
222 // to true.
223
224 static Klass* resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS);
263 KlassHandle host_klass,
264 GrowableArray<Handle>* cp_patches,
265 TRAPS);
266
267 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass)
268 static Klass* resolve_from_stream(Symbol* class_name, Handle class_loader,
269 Handle protection_domain,
270 ClassFileStream* st, bool verify, TRAPS);
271
272 // Lookup an already loaded class. If not found NULL is returned.
273 static Klass* find(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
274
275 // Lookup an already loaded instance or array class.
276 // Do not make any queries to class loaders; consult only the cache.
277 // If not found NULL is returned.
278 static Klass* find_instance_or_array_klass(Symbol* class_name,
279 Handle class_loader,
280 Handle protection_domain,
281 TRAPS);
282
283 // Lookup an instance or array class that has already been loaded
284 // either into the given class loader, or else into another class
285 // loader that is constrained (via loader constraints) to produce
286 // a consistent class. Do not take protection domains into account.
287 // Do not make any queries to class loaders; consult only the cache.
288 // Return NULL if the class is not found.
289 //
290 // This function is a strict superset of find_instance_or_array_klass.
291 // This function (the unchecked version) makes a conservative prediction
292 // of the result of the checked version, assuming successful lookup.
293 // If both functions return non-null, they must return the same value.
294 // Also, the unchecked version may sometimes be non-null where the
295 // checked version is null. This can occur in several ways:
296 // 1. No query has yet been made to the class loader.
297 // 2. The class loader was queried, but chose not to delegate.
298 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain.
299 // 4. Loading was attempted, but there was a linkage error of some sort.
300 // In all of these cases, the loader constraints on this type are
301 // satisfied, and it is safe for classes in the given class loader
302 // to manipulate strongly-typed values of the found class, subject
373 static void verify();
374
375 #ifdef ASSERT
376 static bool is_internal_format(Symbol* class_name);
377 #endif
378
379 // Verify class is in dictionary
380 static void verify_obj_klass_present(Symbol* class_name,
381 ClassLoaderData* loader_data);
382
383 // Initialization
384 static void initialize(TRAPS);
385
386 // Fast access to commonly used classes (preloaded)
387 static Klass* check_klass(Klass* k) {
388 assert(k != NULL, "preloaded klass not initialized");
389 return k;
390 }
391
392 static Klass* check_klass_Pre( Klass* k) { return check_klass(k); }
393 static Klass* check_klass_Pre_JSR292(Klass* k) { return EnableInvokeDynamic ? check_klass(k) : k; }
394 static Klass* check_klass_Opt( Klass* k) { return k; }
395 static Klass* check_klass_Opt_Kernel(Klass* k) { return k; } //== Opt
396 static Klass* check_klass_Opt_Only_JDK15(Klass* k) {
397 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only");
398 return k;
399 }
400 static Klass* check_klass_Opt_Only_JDK14NewRef(Klass* k) {
401 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only");
402 // despite the optional loading, if you use this it must be present:
403 return check_klass(k);
404 }
405
406 static bool initialize_wk_klass(WKID id, int init_opt, TRAPS);
407 static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS);
408 static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) {
409 int limit = (int)end_id + 1;
410 initialize_wk_klasses_until((WKID) limit, start_id, THREAD);
411 }
412
413 public:
414 #define WK_KLASS_DECLARE(name, symbol, option) \
415 static Klass* name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } \
416 static Klass** name##_addr() { \
417 return &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \
418 }
419 WK_KLASSES_DO(WK_KLASS_DECLARE);
420 #undef WK_KLASS_DECLARE
421
422 static Klass* well_known_klass(WKID id) {
423 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob");
424 return _well_known_klasses[id];
425 }
426
427 static Klass** well_known_klass_addr(WKID id) {
428 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob");
429 return &_well_known_klasses[id];
430 }
431
432 // Local definition for direct access to the private array:
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