1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_CLASSFILE_SYSTEMDICTIONARY_HPP
26 #define SHARE_CLASSFILE_SYSTEMDICTIONARY_HPP
27
28 #include "classfile/classLoader.hpp"
29 #include "jvmci/systemDictionary_jvmci.hpp"
30 #include "oops/fieldStreams.hpp"
31 #include "oops/objArrayOop.hpp"
32 #include "oops/symbol.hpp"
33 #include "runtime/java.hpp"
34 #include "runtime/reflectionUtils.hpp"
35 #include "runtime/signature.hpp"
36 #include "utilities/hashtable.hpp"
37
38 // The dictionary in each ClassLoaderData stores all loaded classes, either
39 // initiatied by its class loader or defined by its class loader:
40 //
41 // class loader -> ClassLoaderData -> [class, protection domain set]
42 //
43 // Classes are loaded lazily. The default VM class loader is
44 // represented as NULL.
45
46 // The underlying data structure is an open hash table (Dictionary) per
47 // ClassLoaderData with a fixed number of buckets. During loading the
48 // class loader object is locked, (for the VM loader a private lock object is used).
49 // The global SystemDictionary_lock is held for all additions into the ClassLoaderData
50 // dictionaries. TODO: fix lock granularity so that class loading can
51 // be done concurrently, but only by different loaders.
52 //
53 // During loading a placeholder (name, loader) is temporarily placed in
54 // a side data structure, and is used to detect ClassCircularityErrors
55 // and to perform verification during GC. A GC can occur in the midst
56 // of class loading, as we call out to Java, have to take locks, etc.
57 //
58 // When class loading is finished, a new entry is added to the dictionary
59 // of the class loader and the placeholder is removed. Note that the protection
60 // domain field of the dictionary entry has not yet been filled in when
61 // the "real" dictionary entry is created.
62 //
63 // Clients of this class who are interested in finding if a class has
64 // been completely loaded -- not classes in the process of being loaded --
65 // can read the dictionary unlocked. This is safe because
66 // - entries are only deleted at safepoints
67 // - readers cannot come to a safepoint while actively examining
68 // an entry (an entry cannot be deleted from under a reader)
69 // - entries must be fully formed before they are available to concurrent
70 // readers (we must ensure write ordering)
71 //
72 // Note that placeholders are deleted at any time, as they are removed
73 // when a class is completely loaded. Therefore, readers as well as writers
74 // of placeholders must hold the SystemDictionary_lock.
75 //
76
77 class ClassFileStream;
78 class Dictionary;
79 class PlaceholderTable;
80 class LoaderConstraintTable;
81 template <MEMFLAGS F> class HashtableBucket;
82 class ResolutionErrorTable;
83 class SymbolPropertyTable;
84 class ProtectionDomainCacheTable;
85 class ProtectionDomainCacheEntry;
86 class GCTimer;
87 class OopStorage;
88
89 #define WK_KLASS_ENUM_NAME(kname) kname##_knum
90
91 // Certain classes, such as java.lang.Object and java.lang.String,
92 // are "well-known", in the sense that no class loader is allowed
93 // to provide a different definition.
94 //
95 // Each well-known class has a short klass name (like object_klass),
96 // and a vmSymbol name (like java_lang_Object).
97 //
98 // The order of these definitions is significant: the classes are
99 // resolved during early VM start-up by resolve_well_known_classes
100 // in this order. Changing the order may require careful restructuring
101 // of the VM start-up sequence.
102 //
103 #define WK_KLASSES_DO(do_klass) \
104 /* well-known classes */ \
105 do_klass(Object_klass, java_lang_Object ) \
106 do_klass(String_klass, java_lang_String ) \
107 do_klass(Class_klass, java_lang_Class ) \
108 do_klass(Cloneable_klass, java_lang_Cloneable ) \
109 do_klass(ClassLoader_klass, java_lang_ClassLoader ) \
110 do_klass(Serializable_klass, java_io_Serializable ) \
111 do_klass(System_klass, java_lang_System ) \
112 do_klass(Throwable_klass, java_lang_Throwable ) \
113 do_klass(Error_klass, java_lang_Error ) \
114 do_klass(ThreadDeath_klass, java_lang_ThreadDeath ) \
115 do_klass(Exception_klass, java_lang_Exception ) \
116 do_klass(RuntimeException_klass, java_lang_RuntimeException ) \
117 do_klass(SecurityManager_klass, java_lang_SecurityManager ) \
118 do_klass(ProtectionDomain_klass, java_security_ProtectionDomain ) \
119 do_klass(AccessControlContext_klass, java_security_AccessControlContext ) \
120 do_klass(AccessController_klass, java_security_AccessController ) \
121 do_klass(SecureClassLoader_klass, java_security_SecureClassLoader ) \
122 do_klass(ClassNotFoundException_klass, java_lang_ClassNotFoundException ) \
123 do_klass(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError ) \
124 do_klass(LinkageError_klass, java_lang_LinkageError ) \
125 do_klass(ClassCastException_klass, java_lang_ClassCastException ) \
126 do_klass(ArrayStoreException_klass, java_lang_ArrayStoreException ) \
127 do_klass(VirtualMachineError_klass, java_lang_VirtualMachineError ) \
128 do_klass(OutOfMemoryError_klass, java_lang_OutOfMemoryError ) \
129 do_klass(StackOverflowError_klass, java_lang_StackOverflowError ) \
130 do_klass(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException ) \
131 do_klass(Reference_klass, java_lang_ref_Reference ) \
132 \
133 /* ref klasses and set reference types */ \
134 do_klass(SoftReference_klass, java_lang_ref_SoftReference ) \
135 do_klass(WeakReference_klass, java_lang_ref_WeakReference ) \
136 do_klass(FinalReference_klass, java_lang_ref_FinalReference ) \
137 do_klass(PhantomReference_klass, java_lang_ref_PhantomReference ) \
138 do_klass(Finalizer_klass, java_lang_ref_Finalizer ) \
139 \
140 do_klass(Thread_klass, java_lang_Thread ) \
141 do_klass(ThreadGroup_klass, java_lang_ThreadGroup ) \
142 do_klass(Properties_klass, java_util_Properties ) \
143 do_klass(Module_klass, java_lang_Module ) \
144 do_klass(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject ) \
145 do_klass(reflect_Field_klass, java_lang_reflect_Field ) \
146 do_klass(reflect_Parameter_klass, java_lang_reflect_Parameter ) \
147 do_klass(reflect_Method_klass, java_lang_reflect_Method ) \
148 do_klass(reflect_Constructor_klass, java_lang_reflect_Constructor ) \
149 \
150 /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \
151 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
152 do_klass(reflect_MagicAccessorImpl_klass, reflect_MagicAccessorImpl ) \
153 do_klass(reflect_MethodAccessorImpl_klass, reflect_MethodAccessorImpl ) \
154 do_klass(reflect_ConstructorAccessorImpl_klass, reflect_ConstructorAccessorImpl ) \
155 do_klass(reflect_DelegatingClassLoader_klass, reflect_DelegatingClassLoader ) \
156 do_klass(reflect_ConstantPool_klass, reflect_ConstantPool ) \
157 do_klass(reflect_UnsafeStaticFieldAccessorImpl_klass, reflect_UnsafeStaticFieldAccessorImpl ) \
158 do_klass(reflect_CallerSensitive_klass, reflect_CallerSensitive ) \
159 \
160 /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \
161 do_klass(DirectMethodHandle_klass, java_lang_invoke_DirectMethodHandle ) \
162 do_klass(MethodHandle_klass, java_lang_invoke_MethodHandle ) \
163 do_klass(VarHandle_klass, java_lang_invoke_VarHandle ) \
164 do_klass(MemberName_klass, java_lang_invoke_MemberName ) \
165 do_klass(ResolvedMethodName_klass, java_lang_invoke_ResolvedMethodName ) \
166 do_klass(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives ) \
167 do_klass(LambdaForm_klass, java_lang_invoke_LambdaForm ) \
168 do_klass(MethodType_klass, java_lang_invoke_MethodType ) \
169 do_klass(BootstrapMethodError_klass, java_lang_BootstrapMethodError ) \
170 do_klass(CallSite_klass, java_lang_invoke_CallSite ) \
171 do_klass(Context_klass, java_lang_invoke_MethodHandleNatives_CallSiteContext ) \
172 do_klass(ConstantCallSite_klass, java_lang_invoke_ConstantCallSite ) \
173 do_klass(MutableCallSite_klass, java_lang_invoke_MutableCallSite ) \
174 do_klass(VolatileCallSite_klass, java_lang_invoke_VolatileCallSite ) \
175 /* Note: MethodHandle must be first, and VolatileCallSite last in group */ \
176 \
177 do_klass(AssertionStatusDirectives_klass, java_lang_AssertionStatusDirectives ) \
178 do_klass(StringBuffer_klass, java_lang_StringBuffer ) \
179 do_klass(StringBuilder_klass, java_lang_StringBuilder ) \
180 do_klass(internal_Unsafe_klass, jdk_internal_misc_Unsafe ) \
181 do_klass(module_Modules_klass, jdk_internal_module_Modules ) \
182 \
183 /* support for CDS */ \
184 do_klass(ByteArrayInputStream_klass, java_io_ByteArrayInputStream ) \
185 do_klass(URL_klass, java_net_URL ) \
186 do_klass(Jar_Manifest_klass, java_util_jar_Manifest ) \
187 do_klass(jdk_internal_loader_ClassLoaders_klass, jdk_internal_loader_ClassLoaders ) \
188 do_klass(jdk_internal_loader_ClassLoaders_AppClassLoader_klass, jdk_internal_loader_ClassLoaders_AppClassLoader) \
189 do_klass(jdk_internal_loader_ClassLoaders_PlatformClassLoader_klass, jdk_internal_loader_ClassLoaders_PlatformClassLoader) \
190 do_klass(CodeSource_klass, java_security_CodeSource ) \
191 \
192 do_klass(StackTraceElement_klass, java_lang_StackTraceElement ) \
193 \
194 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
195 do_klass(nio_Buffer_klass, java_nio_Buffer ) \
196 \
197 /* Stack Walking */ \
198 do_klass(StackWalker_klass, java_lang_StackWalker ) \
199 do_klass(AbstractStackWalker_klass, java_lang_StackStreamFactory_AbstractStackWalker ) \
200 do_klass(StackFrameInfo_klass, java_lang_StackFrameInfo ) \
201 do_klass(LiveStackFrameInfo_klass, java_lang_LiveStackFrameInfo ) \
202 \
203 /* support for stack dump lock analysis */ \
204 do_klass(java_util_concurrent_locks_AbstractOwnableSynchronizer_klass, java_util_concurrent_locks_AbstractOwnableSynchronizer) \
205 \
206 /* boxing klasses */ \
207 do_klass(Boolean_klass, java_lang_Boolean ) \
208 do_klass(Character_klass, java_lang_Character ) \
209 do_klass(Float_klass, java_lang_Float ) \
210 do_klass(Double_klass, java_lang_Double ) \
211 do_klass(Byte_klass, java_lang_Byte ) \
212 do_klass(Short_klass, java_lang_Short ) \
213 do_klass(Integer_klass, java_lang_Integer ) \
214 do_klass(Long_klass, java_lang_Long ) \
215 \
216 \
217 /* JVMCI classes. These are loaded on-demand. */ \
218 JVMCI_WK_KLASSES_DO(do_klass) \
219 \
220 /*end*/
221
222
223 class SystemDictionary : AllStatic {
224 friend class VMStructs;
225 friend class SystemDictionaryHandles;
226
227 public:
228 enum WKID {
229 NO_WKID = 0,
230
231 #define WK_KLASS_ENUM(name, symbol) WK_KLASS_ENUM_NAME(name), WK_KLASS_ENUM_NAME(symbol) = WK_KLASS_ENUM_NAME(name),
232 WK_KLASSES_DO(WK_KLASS_ENUM)
233 #undef WK_KLASS_ENUM
234
235 WKID_LIMIT,
236
237 #if INCLUDE_JVMCI
238 FIRST_JVMCI_WKID = WK_KLASS_ENUM_NAME(JVMCI_klass),
239 LAST_JVMCI_WKID = WK_KLASS_ENUM_NAME(Value_klass),
240 #endif
241
242 FIRST_WKID = NO_WKID + 1
243 };
244
245 // Returns a class with a given class name and class loader. Loads the
246 // class if needed. If not found a NoClassDefFoundError or a
247 // ClassNotFoundException is thrown, depending on the value on the
248 // throw_error flag. For most uses the throw_error argument should be set
249 // to true.
250
251 static Klass* resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS);
252 // Convenient call for null loader and protection domain.
253 static Klass* resolve_or_fail(Symbol* class_name, bool throw_error, TRAPS);
254 protected:
255 // handle error translation for resolve_or_null results
256 static Klass* handle_resolution_exception(Symbol* class_name, bool throw_error, Klass* klass, TRAPS);
257
258 public:
259
260 // Returns a class with a given class name and class loader.
261 // Loads the class if needed. If not found NULL is returned.
262 static Klass* resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
263 // Version with null loader and protection domain
264 static Klass* resolve_or_null(Symbol* class_name, TRAPS);
265
266 // Resolve a superclass or superinterface. Called from ClassFileParser,
267 // parse_interfaces, resolve_instance_class_or_null, load_shared_class
268 // "child_name" is the class whose super class or interface is being resolved.
269 static InstanceKlass* resolve_super_or_fail(Symbol* child_name,
270 Symbol* class_name,
271 Handle class_loader,
272 Handle protection_domain,
273 bool is_superclass,
274 TRAPS);
275
276 static Klass* resolve_flattenable_field_or_fail(AllFieldStream* fs,
277 Handle class_loader,
278 Handle protection_domain,
279 bool throw_error,
280 TRAPS);
281
282 // Parse new stream. This won't update the dictionary or
283 // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses.
284 // Also used by Unsafe_DefineAnonymousClass
285 static InstanceKlass* parse_stream(Symbol* class_name,
286 Handle class_loader,
287 Handle protection_domain,
288 ClassFileStream* st,
289 TRAPS) {
290 return parse_stream(class_name,
291 class_loader,
292 protection_domain,
293 st,
294 NULL, // unsafe_anonymous_host
295 NULL, // cp_patches
296 THREAD);
297 }
298 static InstanceKlass* parse_stream(Symbol* class_name,
299 Handle class_loader,
300 Handle protection_domain,
301 ClassFileStream* st,
302 const InstanceKlass* unsafe_anonymous_host,
303 GrowableArray<Handle>* cp_patches,
304 TRAPS);
305
306 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass)
307 static InstanceKlass* resolve_from_stream(Symbol* class_name,
308 Handle class_loader,
309 Handle protection_domain,
310 ClassFileStream* st,
311 TRAPS);
312
313 // Lookup an already loaded class. If not found NULL is returned.
314 static Klass* find(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
315
316 // Lookup an already loaded instance or array class.
317 // Do not make any queries to class loaders; consult only the cache.
318 // If not found NULL is returned.
319 static Klass* find_instance_or_array_klass(Symbol* class_name,
320 Handle class_loader,
321 Handle protection_domain,
322 TRAPS);
323
324 // Lookup an instance or array class that has already been loaded
325 // either into the given class loader, or else into another class
326 // loader that is constrained (via loader constraints) to produce
327 // a consistent class. Do not take protection domains into account.
328 // Do not make any queries to class loaders; consult only the cache.
329 // Return NULL if the class is not found.
330 //
331 // This function is a strict superset of find_instance_or_array_klass.
332 // This function (the unchecked version) makes a conservative prediction
333 // of the result of the checked version, assuming successful lookup.
334 // If both functions return non-null, they must return the same value.
335 // Also, the unchecked version may sometimes be non-null where the
336 // checked version is null. This can occur in several ways:
337 // 1. No query has yet been made to the class loader.
338 // 2. The class loader was queried, but chose not to delegate.
339 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain.
340 // 4. Loading was attempted, but there was a linkage error of some sort.
341 // In all of these cases, the loader constraints on this type are
342 // satisfied, and it is safe for classes in the given class loader
343 // to manipulate strongly-typed values of the found class, subject
344 // to local linkage and access checks.
345 static Klass* find_constrained_instance_or_array_klass(Symbol* class_name,
346 Handle class_loader,
347 TRAPS);
348
349 static void classes_do(MetaspaceClosure* it);
350 // Iterate over all methods in all klasses
351
352 static void methods_do(void f(Method*));
353
354 // Garbage collection support
355
356 // Unload (that is, break root links to) all unmarked classes and
357 // loaders. Returns "true" iff something was unloaded.
358 static bool do_unloading(GCTimer* gc_timer);
359
360 // Applies "f->do_oop" to all root oops in the system dictionary.
361 static void oops_do(OopClosure* f);
362
363 // System loader lock
364 static oop system_loader_lock() { return _system_loader_lock_obj; }
365
366 // Protection Domain Table
367 static ProtectionDomainCacheTable* pd_cache_table() { return _pd_cache_table; }
368
369 public:
370 // Printing
371 static void print() { return print_on(tty); }
372 static void print_on(outputStream* st);
373 static void dump(outputStream* st, bool verbose);
374
375 // Monotonically increasing counter which grows as classes are
376 // loaded or modifications such as hot-swapping or setting/removing
377 // of breakpoints are performed
378 static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; }
379 // Needed by evolution and breakpoint code
380 static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; }
381
382 // Verification
383 static void verify();
384
385 // Initialization
386 static void initialize(TRAPS);
387
388 // Checked fast access to the well-known classes -- so that you don't try to use them
389 // before they are resolved.
390 static InstanceKlass* check_klass(InstanceKlass* k) {
391 assert(k != NULL, "klass not loaded");
392 return k;
393 }
394
395 static bool resolve_wk_klass(WKID id, TRAPS);
396 static InstanceKlass* check_klass_ValhallaClasses(InstanceKlass* k) { return k; }
397 static void resolve_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS);
398 static void resolve_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) {
399 int limit = (int)end_id + 1;
400 resolve_wk_klasses_until((WKID) limit, start_id, THREAD);
401 }
402
403 public:
404 #define WK_KLASS_DECLARE(name, symbol) \
405 static InstanceKlass* name() { return check_klass(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } \
406 static InstanceKlass** name##_addr() { \
407 return &_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \
408 } \
409 static bool name##_is_loaded() { \
410 return _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)] != NULL; \
411 }
412 WK_KLASSES_DO(WK_KLASS_DECLARE);
413 #undef WK_KLASS_DECLARE
414
415 static InstanceKlass* well_known_klass(WKID id) {
416 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob");
417 return _well_known_klasses[id];
418 }
419
420 static InstanceKlass** well_known_klass_addr(WKID id) {
421 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob");
422 return &_well_known_klasses[id];
423 }
424 static void well_known_klasses_do(MetaspaceClosure* it);
425
426 // Local definition for direct access to the private array:
427 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]
428
429 static InstanceKlass* box_klass(BasicType t) {
430 assert((uint)t < T_VOID+1, "range check");
431 return check_klass(_box_klasses[t]);
432 }
433 static BasicType box_klass_type(Klass* k); // inverse of box_klass
434 #ifdef ASSERT
435 static bool is_well_known_klass(Klass* k) {
436 return is_well_known_klass(k->name());
437 }
438 static bool is_well_known_klass(Symbol* class_name);
439 #endif
440
441 protected:
442 // Returns the class loader data to be used when looking up/updating the
443 // system dictionary.
444 static ClassLoaderData *class_loader_data(Handle class_loader) {
445 return ClassLoaderData::class_loader_data(class_loader());
446 }
447
448 public:
449 // Tells whether ClassLoader.checkPackageAccess is present
450 static bool has_checkPackageAccess() { return _has_checkPackageAccess; }
451
452 static bool Parameter_klass_loaded() { return WK_KLASS(reflect_Parameter_klass) != NULL; }
453 static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; }
454 static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; }
455 static bool Object_klass_loaded() { return WK_KLASS(Object_klass) != NULL; }
456 static bool ClassLoader_klass_loaded() { return WK_KLASS(ClassLoader_klass) != NULL; }
457
458 // Returns java system loader
459 static oop java_system_loader();
460
461 // Returns java platform loader
462 static oop java_platform_loader();
463
464 // Compute the java system and platform loaders
465 static void compute_java_loaders(TRAPS);
466
467 // Register a new class loader
468 static ClassLoaderData* register_loader(Handle class_loader);
469 protected:
470 // Mirrors for primitive classes (created eagerly)
471 static oop check_mirror(oop m) {
472 assert(m != NULL, "mirror not initialized");
473 return m;
474 }
475
476 public:
477 // Note: java_lang_Class::primitive_type is the inverse of java_mirror
478
479 // Check class loader constraints
480 static bool add_loader_constraint(Symbol* name, Handle loader1,
481 Handle loader2, TRAPS);
482 static Symbol* check_signature_loaders(Symbol* signature, Handle loader1,
483 Handle loader2, bool is_method, TRAPS);
484
485 // JSR 292
486 // find a java.lang.invoke.MethodHandle.invoke* method for a given signature
487 // (asks Java to compute it if necessary, except in a compiler thread)
488 static methodHandle find_method_handle_invoker(Klass* klass,
489 Symbol* name,
490 Symbol* signature,
491 Klass* accessing_klass,
492 Handle *appendix_result,
493 Handle *method_type_result,
494 TRAPS);
495 // for a given signature, find the internal MethodHandle method (linkTo* or invokeBasic)
496 // (does not ask Java, since this is a low-level intrinsic defined by the JVM)
497 static methodHandle find_method_handle_intrinsic(vmIntrinsics::ID iid,
498 Symbol* signature,
499 TRAPS);
500
501 // compute java_mirror (java.lang.Class instance) for a type ("I", "[[B", "LFoo;", etc.)
502 // Either the accessing_klass or the CL/PD can be non-null, but not both.
503 static Handle find_java_mirror_for_type(Symbol* signature,
504 Klass* accessing_klass,
505 Handle class_loader,
506 Handle protection_domain,
507 SignatureStream::FailureMode failure_mode,
508 TRAPS);
509 static Handle find_java_mirror_for_type(Symbol* signature,
510 Klass* accessing_klass,
511 SignatureStream::FailureMode failure_mode,
512 TRAPS) {
513 // callee will fill in CL/PD from AK, if they are needed
514 return find_java_mirror_for_type(signature, accessing_klass, Handle(), Handle(),
515 failure_mode, THREAD);
516 }
517
518
519 // fast short-cut for the one-character case:
520 static oop find_java_mirror_for_type(char signature_char);
521
522 // find a java.lang.invoke.MethodType object for a given signature
523 // (asks Java to compute it if necessary, except in a compiler thread)
524 static Handle find_method_handle_type(Symbol* signature,
525 Klass* accessing_klass,
526 TRAPS);
527
528 // find a java.lang.Class object for a given signature
529 static Handle find_field_handle_type(Symbol* signature,
530 Klass* accessing_klass,
531 TRAPS);
532
533 // ask Java to compute a java.lang.invoke.MethodHandle object for a given CP entry
534 static Handle link_method_handle_constant(Klass* caller,
535 int ref_kind, //e.g., JVM_REF_invokeVirtual
536 Klass* callee,
537 Symbol* name,
538 Symbol* signature,
539 TRAPS);
540
541 // ask Java to compute a constant by invoking a BSM given a Dynamic_info CP entry
542 static Handle link_dynamic_constant(Klass* caller,
543 int condy_index,
544 Handle bootstrap_specifier,
545 Symbol* name,
546 Symbol* type,
547 TRAPS);
548
549 // ask Java to create a dynamic call site, while linking an invokedynamic op
550 static methodHandle find_dynamic_call_site_invoker(Klass* caller,
551 int indy_index,
552 Handle bootstrap_method,
553 Symbol* name,
554 Symbol* type,
555 Handle *appendix_result,
556 Handle *method_type_result,
557 TRAPS);
558
559 // Record the error when the first attempt to resolve a reference from a constant
560 // pool entry to a class fails.
561 static void add_resolution_error(const constantPoolHandle& pool, int which, Symbol* error,
562 Symbol* message);
563 static void delete_resolution_error(ConstantPool* pool);
564 static Symbol* find_resolution_error(const constantPoolHandle& pool, int which,
565 Symbol** message);
566
567
568 static ProtectionDomainCacheEntry* cache_get(Handle protection_domain);
569
570 protected:
571
572 enum Constants {
573 _loader_constraint_size = 107, // number of entries in constraint table
574 _resolution_error_size = 107, // number of entries in resolution error table
575 _invoke_method_size = 139, // number of entries in invoke method table
576 _placeholder_table_size = 1009 // number of entries in hash table for placeholders
577 };
578
579
580 // Static tables owned by the SystemDictionary
581
582 // Hashtable holding placeholders for classes being loaded.
583 static PlaceholderTable* _placeholders;
584
585 // Monotonically increasing counter which grows with
586 // loading classes as well as hot-swapping and breakpoint setting
587 // and removal.
588 static int _number_of_modifications;
589
590 // Lock object for system class loader
591 static oop _system_loader_lock_obj;
592
593 // Constraints on class loaders
594 static LoaderConstraintTable* _loader_constraints;
595
596 // Resolution errors
597 static ResolutionErrorTable* _resolution_errors;
598
599 // Invoke methods (JSR 292)
600 static SymbolPropertyTable* _invoke_method_table;
601
602 // ProtectionDomain cache
603 static ProtectionDomainCacheTable* _pd_cache_table;
604
605 // VM weak OopStorage object.
606 static OopStorage* _vm_weak_oop_storage;
607
608 protected:
609 static void validate_protection_domain(InstanceKlass* klass,
610 Handle class_loader,
611 Handle protection_domain, TRAPS);
612
613 friend class VM_PopulateDumpSharedSpace;
614 friend class TraversePlaceholdersClosure;
615 static PlaceholderTable* placeholders() { return _placeholders; }
616 static LoaderConstraintTable* constraints() { return _loader_constraints; }
617 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; }
618 static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; }
619
620 // Basic loading operations
621 static InstanceKlass* resolve_instance_class_or_null_helper(Symbol* name,
622 Handle class_loader,
623 Handle protection_domain,
624 TRAPS);
625 static InstanceKlass* resolve_instance_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
626 static Klass* resolve_array_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
627 static InstanceKlass* handle_parallel_super_load(Symbol* class_name, Symbol* supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS);
628 // Wait on SystemDictionary_lock; unlocks lockObject before
629 // waiting; relocks lockObject with correct recursion count
630 // after waiting, but before reentering SystemDictionary_lock
631 // to preserve lock order semantics.
632 static void double_lock_wait(Handle lockObject, TRAPS);
633 static void define_instance_class(InstanceKlass* k, TRAPS);
634 static InstanceKlass* find_or_define_instance_class(Symbol* class_name,
635 Handle class_loader,
636 InstanceKlass* k, TRAPS);
637 static bool is_shared_class_visible(Symbol* class_name, InstanceKlass* ik,
638 Handle class_loader, TRAPS);
639 static InstanceKlass* load_shared_class(InstanceKlass* ik,
640 Handle class_loader,
641 Handle protection_domain,
642 TRAPS);
643 static InstanceKlass* load_shared_boot_class(Symbol* class_name,
644 TRAPS);
645 static InstanceKlass* load_instance_class(Symbol* class_name, Handle class_loader, TRAPS);
646 static Handle compute_loader_lock_object(Handle class_loader, TRAPS);
647 static void check_loader_lock_contention(Handle loader_lock, TRAPS);
648 static bool is_parallelCapable(Handle class_loader);
649 static bool is_parallelDefine(Handle class_loader);
650
651 public:
652 static bool is_system_class_loader(oop class_loader);
653 static bool is_platform_class_loader(oop class_loader);
654
655 // Returns TRUE if the method is a non-public member of class java.lang.Object.
656 static bool is_nonpublic_Object_method(Method* m) {
657 assert(m != NULL, "Unexpected NULL Method*");
658 return !m->is_public() && m->method_holder() == SystemDictionary::Object_klass();
659 }
660
661 static void initialize_oop_storage();
662 static OopStorage* vm_weak_oop_storage();
663
664 protected:
665 // Setup link to hierarchy
666 static void add_to_hierarchy(InstanceKlass* k, TRAPS);
667
668 // Basic find on loaded classes
669 static InstanceKlass* find_class(unsigned int hash,
670 Symbol* name, Dictionary* dictionary);
671 static InstanceKlass* find_class(Symbol* class_name, ClassLoaderData* loader_data);
672
673 // Basic find on classes in the midst of being loaded
674 static Symbol* find_placeholder(Symbol* name, ClassLoaderData* loader_data);
675
676 // Add a placeholder for a class being loaded
677 static void add_placeholder(int index,
678 Symbol* class_name,
679 ClassLoaderData* loader_data);
680 static void remove_placeholder(int index,
681 Symbol* class_name,
682 ClassLoaderData* loader_data);
683
684 // Performs cleanups after resolve_super_or_fail. This typically needs
685 // to be called on failure.
686 // Won't throw, but can block.
687 static void resolution_cleanups(Symbol* class_name,
688 ClassLoaderData* loader_data,
689 TRAPS);
690
691 // Resolve well-known classes so they can be used like SystemDictionary::String_klass()
692 static void resolve_well_known_classes(TRAPS);
693
694 // Class loader constraints
695 static void check_constraints(unsigned int hash,
696 InstanceKlass* k, Handle loader,
697 bool defining, TRAPS);
698 static void update_dictionary(unsigned int d_hash,
699 int p_index, unsigned int p_hash,
700 InstanceKlass* k, Handle loader,
701 TRAPS);
702
703 static InstanceKlass* _well_known_klasses[];
704
705 // table of box klasses (int_klass, etc.)
706 static InstanceKlass* _box_klasses[T_VOID+1];
707
708 private:
709 static oop _java_system_loader;
710 static oop _java_platform_loader;
711
712 static bool _has_checkPackageAccess;
713 };
714
715 #endif // SHARE_CLASSFILE_SYSTEMDICTIONARY_HPP