1 /*
2 * Copyright (c) 1997, 2020, 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
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23 */
24
25 #ifndef SHARE_CLASSFILE_SYSTEMDICTIONARY_HPP
26 #define SHARE_CLASSFILE_SYSTEMDICTIONARY_HPP
27
28 #include "classfile/classLoaderData.hpp"
29 #include "oops/objArrayOop.hpp"
30 #include "oops/symbol.hpp"
31 #include "runtime/java.hpp"
32 #include "runtime/mutexLocker.hpp"
33 #include "runtime/reflectionUtils.hpp"
34 #include "runtime/signature.hpp"
35 #include "utilities/hashtable.hpp"
36
37 class ClassInstanceInfo : public StackObj {
38 private:
39 InstanceKlass* _dynamic_nest_host;
40 Handle _class_data;
41
42 public:
43 ClassInstanceInfo() {
44 _dynamic_nest_host = NULL;
45 _class_data = Handle();
46 }
47 ClassInstanceInfo(InstanceKlass* dynamic_nest_host, Handle class_data) {
48 _dynamic_nest_host = dynamic_nest_host;
49 _class_data = class_data;
50 }
51
52 InstanceKlass* dynamic_nest_host() const { return _dynamic_nest_host; }
53 Handle class_data() const { return _class_data; }
54 friend class ClassLoadInfo;
55 };
56
57 class ClassLoadInfo : public StackObj {
58 private:
59 Handle _protection_domain;
60 const InstanceKlass* _unsafe_anonymous_host;
61 GrowableArray<Handle>* _cp_patches;
62 ClassInstanceInfo _class_hidden_info;
63 bool _is_hidden;
64 bool _is_strong_hidden;
65 bool _can_access_vm_annotations;
66
67 public:
68 ClassLoadInfo();
69 ClassLoadInfo(Handle protection_domain);
70 ClassLoadInfo(Handle protection_domain, const InstanceKlass* unsafe_anonymous_host,
71 GrowableArray<Handle>* cp_patches, InstanceKlass* dynamic_nest_host,
72 Handle class_data, bool is_hidden, bool is_strong_hidden,
73 bool can_access_vm_annotations);
74
75 Handle protection_domain() const { return _protection_domain; }
76 const InstanceKlass* unsafe_anonymous_host() const { return _unsafe_anonymous_host; }
77 GrowableArray<Handle>* cp_patches() const { return _cp_patches; }
78 const ClassInstanceInfo* class_hidden_info_ptr() const { return &_class_hidden_info; }
79 bool is_hidden() const { return _is_hidden; }
80 bool is_strong_hidden() const { return _is_strong_hidden; }
81 bool can_access_vm_annotations() const { return _can_access_vm_annotations; }
82 };
83
84 // The dictionary in each ClassLoaderData stores all loaded classes, either
85 // initiatied by its class loader or defined by its class loader:
86 //
87 // class loader -> ClassLoaderData -> [class, protection domain set]
88 //
89 // Classes are loaded lazily. The default VM class loader is
90 // represented as NULL.
91
92 // The underlying data structure is an open hash table (Dictionary) per
93 // ClassLoaderData with a fixed number of buckets. During loading the
94 // class loader object is locked, (for the VM loader a private lock object is used).
95 // The global SystemDictionary_lock is held for all additions into the ClassLoaderData
96 // dictionaries. TODO: fix lock granularity so that class loading can
97 // be done concurrently, but only by different loaders.
98 //
99 // During loading a placeholder (name, loader) is temporarily placed in
100 // a side data structure, and is used to detect ClassCircularityErrors
101 // and to perform verification during GC. A GC can occur in the midst
102 // of class loading, as we call out to Java, have to take locks, etc.
103 //
104 // When class loading is finished, a new entry is added to the dictionary
105 // of the class loader and the placeholder is removed. Note that the protection
106 // domain field of the dictionary entry has not yet been filled in when
107 // the "real" dictionary entry is created.
108 //
109 // Clients of this class who are interested in finding if a class has
110 // been completely loaded -- not classes in the process of being loaded --
111 // can read the dictionary unlocked. This is safe because
112 // - entries are only deleted at safepoints
113 // - readers cannot come to a safepoint while actively examining
114 // an entry (an entry cannot be deleted from under a reader)
115 // - entries must be fully formed before they are available to concurrent
116 // readers (we must ensure write ordering)
117 //
118 // Note that placeholders are deleted at any time, as they are removed
119 // when a class is completely loaded. Therefore, readers as well as writers
120 // of placeholders must hold the SystemDictionary_lock.
121 //
122
123 class BootstrapInfo;
124 class ClassFileStream;
125 class Dictionary;
126 class PlaceholderTable;
127 class LoaderConstraintTable;
128 template <MEMFLAGS F> class HashtableBucket;
129 class ResolutionErrorTable;
130 class SymbolPropertyTable;
131 class ProtectionDomainCacheTable;
132 class ProtectionDomainCacheEntry;
133 class GCTimer;
134 class EventClassLoad;
135
136 #define WK_KLASS_ENUM_NAME(kname) kname##_knum
137
138 // Certain classes, such as java.lang.Object and java.lang.String,
139 // are "well-known", in the sense that no class loader is allowed
140 // to provide a different definition.
141 //
142 // Each well-known class has a short klass name (like object_klass),
143 // and a vmSymbol name (like java_lang_Object).
144 //
145 // The order of these definitions is significant: the classes are
146 // resolved during early VM start-up by resolve_well_known_classes
147 // in this order. Changing the order may require careful restructuring
148 // of the VM start-up sequence.
149 //
150 #define WK_KLASSES_DO(do_klass) \
151 /* well-known classes */ \
152 do_klass(Object_klass, java_lang_Object ) \
153 do_klass(String_klass, java_lang_String ) \
154 do_klass(Class_klass, java_lang_Class ) \
155 do_klass(Cloneable_klass, java_lang_Cloneable ) \
156 do_klass(ClassLoader_klass, java_lang_ClassLoader ) \
157 do_klass(Serializable_klass, java_io_Serializable ) \
158 do_klass(System_klass, java_lang_System ) \
159 do_klass(Throwable_klass, java_lang_Throwable ) \
160 do_klass(Error_klass, java_lang_Error ) \
161 do_klass(ThreadDeath_klass, java_lang_ThreadDeath ) \
162 do_klass(Exception_klass, java_lang_Exception ) \
163 do_klass(RuntimeException_klass, java_lang_RuntimeException ) \
164 do_klass(SecurityManager_klass, java_lang_SecurityManager ) \
165 do_klass(ProtectionDomain_klass, java_security_ProtectionDomain ) \
166 do_klass(AccessControlContext_klass, java_security_AccessControlContext ) \
167 do_klass(AccessController_klass, java_security_AccessController ) \
168 do_klass(SecureClassLoader_klass, java_security_SecureClassLoader ) \
169 do_klass(ClassNotFoundException_klass, java_lang_ClassNotFoundException ) \
170 do_klass(Record_klass, java_lang_Record ) \
171 do_klass(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError ) \
172 do_klass(LinkageError_klass, java_lang_LinkageError ) \
173 do_klass(ClassCastException_klass, java_lang_ClassCastException ) \
174 do_klass(ArrayStoreException_klass, java_lang_ArrayStoreException ) \
175 do_klass(VirtualMachineError_klass, java_lang_VirtualMachineError ) \
176 do_klass(OutOfMemoryError_klass, java_lang_OutOfMemoryError ) \
177 do_klass(StackOverflowError_klass, java_lang_StackOverflowError ) \
178 do_klass(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException ) \
179 do_klass(Reference_klass, java_lang_ref_Reference ) \
180 \
181 /* ref klasses and set reference types */ \
182 do_klass(SoftReference_klass, java_lang_ref_SoftReference ) \
183 do_klass(WeakReference_klass, java_lang_ref_WeakReference ) \
184 do_klass(FinalReference_klass, java_lang_ref_FinalReference ) \
185 do_klass(PhantomReference_klass, java_lang_ref_PhantomReference ) \
186 do_klass(Finalizer_klass, java_lang_ref_Finalizer ) \
187 \
188 do_klass(Thread_klass, java_lang_Thread ) \
189 do_klass(ThreadGroup_klass, java_lang_ThreadGroup ) \
190 do_klass(Properties_klass, java_util_Properties ) \
191 do_klass(Module_klass, java_lang_Module ) \
192 do_klass(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject ) \
193 do_klass(reflect_Field_klass, java_lang_reflect_Field ) \
194 do_klass(reflect_Parameter_klass, java_lang_reflect_Parameter ) \
195 do_klass(reflect_Method_klass, java_lang_reflect_Method ) \
196 do_klass(reflect_Constructor_klass, java_lang_reflect_Constructor ) \
197 \
198 /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \
199 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
200 do_klass(reflect_MagicAccessorImpl_klass, reflect_MagicAccessorImpl ) \
201 do_klass(reflect_MethodAccessorImpl_klass, reflect_MethodAccessorImpl ) \
202 do_klass(reflect_ConstructorAccessorImpl_klass, reflect_ConstructorAccessorImpl ) \
203 do_klass(reflect_DelegatingClassLoader_klass, reflect_DelegatingClassLoader ) \
204 do_klass(reflect_ConstantPool_klass, reflect_ConstantPool ) \
205 do_klass(reflect_UnsafeStaticFieldAccessorImpl_klass, reflect_UnsafeStaticFieldAccessorImpl ) \
206 do_klass(reflect_CallerSensitive_klass, reflect_CallerSensitive ) \
207 do_klass(reflect_NativeConstructorAccessorImpl_klass, reflect_NativeConstructorAccessorImpl ) \
208 \
209 /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \
210 do_klass(DirectMethodHandle_klass, java_lang_invoke_DirectMethodHandle ) \
211 do_klass(MethodHandle_klass, java_lang_invoke_MethodHandle ) \
212 do_klass(VarHandle_klass, java_lang_invoke_VarHandle ) \
213 do_klass(MemberName_klass, java_lang_invoke_MemberName ) \
214 do_klass(ResolvedMethodName_klass, java_lang_invoke_ResolvedMethodName ) \
215 do_klass(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives ) \
216 do_klass(LambdaForm_klass, java_lang_invoke_LambdaForm ) \
217 do_klass(MethodType_klass, java_lang_invoke_MethodType ) \
218 do_klass(BootstrapMethodError_klass, java_lang_BootstrapMethodError ) \
219 do_klass(CallSite_klass, java_lang_invoke_CallSite ) \
220 do_klass(Context_klass, java_lang_invoke_MethodHandleNatives_CallSiteContext ) \
221 do_klass(ConstantCallSite_klass, java_lang_invoke_ConstantCallSite ) \
222 do_klass(MutableCallSite_klass, java_lang_invoke_MutableCallSite ) \
223 do_klass(VolatileCallSite_klass, java_lang_invoke_VolatileCallSite ) \
224 /* Note: MethodHandle must be first, and VolatileCallSite last in group */ \
225 \
226 do_klass(AssertionStatusDirectives_klass, java_lang_AssertionStatusDirectives ) \
227 do_klass(StringBuffer_klass, java_lang_StringBuffer ) \
228 do_klass(StringBuilder_klass, java_lang_StringBuilder ) \
229 do_klass(UnsafeConstants_klass, jdk_internal_misc_UnsafeConstants ) \
230 do_klass(internal_Unsafe_klass, jdk_internal_misc_Unsafe ) \
231 do_klass(module_Modules_klass, jdk_internal_module_Modules ) \
232 \
233 /* support for CDS */ \
234 do_klass(ByteArrayInputStream_klass, java_io_ByteArrayInputStream ) \
235 do_klass(URL_klass, java_net_URL ) \
236 do_klass(Jar_Manifest_klass, java_util_jar_Manifest ) \
237 do_klass(jdk_internal_loader_ClassLoaders_klass, jdk_internal_loader_ClassLoaders ) \
238 do_klass(jdk_internal_loader_ClassLoaders_AppClassLoader_klass, jdk_internal_loader_ClassLoaders_AppClassLoader) \
239 do_klass(jdk_internal_loader_ClassLoaders_PlatformClassLoader_klass, jdk_internal_loader_ClassLoaders_PlatformClassLoader) \
240 do_klass(CodeSource_klass, java_security_CodeSource ) \
241 \
242 do_klass(StackTraceElement_klass, java_lang_StackTraceElement ) \
243 \
244 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
245 do_klass(nio_Buffer_klass, java_nio_Buffer ) \
246 \
247 /* Stack Walking */ \
248 do_klass(StackWalker_klass, java_lang_StackWalker ) \
249 do_klass(AbstractStackWalker_klass, java_lang_StackStreamFactory_AbstractStackWalker ) \
250 do_klass(StackFrameInfo_klass, java_lang_StackFrameInfo ) \
251 do_klass(LiveStackFrameInfo_klass, java_lang_LiveStackFrameInfo ) \
252 \
253 /* support for stack dump lock analysis */ \
254 do_klass(java_util_concurrent_locks_AbstractOwnableSynchronizer_klass, java_util_concurrent_locks_AbstractOwnableSynchronizer) \
255 \
256 /* boxing klasses */ \
257 do_klass(Boolean_klass, java_lang_Boolean ) \
258 do_klass(Character_klass, java_lang_Character ) \
259 do_klass(Float_klass, java_lang_Float ) \
260 do_klass(Double_klass, java_lang_Double ) \
261 do_klass(Byte_klass, java_lang_Byte ) \
262 do_klass(Short_klass, java_lang_Short ) \
263 do_klass(Integer_klass, java_lang_Integer ) \
264 do_klass(Long_klass, java_lang_Long ) \
265 \
266 /* force inline of iterators */ \
267 do_klass(Iterator_klass, java_util_Iterator ) \
268 \
269 /* support for records */ \
270 do_klass(RecordComponent_klass, java_lang_reflect_RecordComponent ) \
271 \
272 /*end*/
273
274 class SystemDictionary : AllStatic {
275 friend class BootstrapInfo;
276 friend class VMStructs;
277
278 public:
279 enum WKID {
280 NO_WKID = 0,
281
282 #define WK_KLASS_ENUM(name, symbol) WK_KLASS_ENUM_NAME(name), WK_KLASS_ENUM_NAME(symbol) = WK_KLASS_ENUM_NAME(name),
283 WK_KLASSES_DO(WK_KLASS_ENUM)
284 #undef WK_KLASS_ENUM
285
286 WKID_LIMIT,
287
288 FIRST_WKID = NO_WKID + 1
289 };
290
291 // Returns a class with a given class name and class loader. Loads the
292 // class if needed. If not found a NoClassDefFoundError or a
293 // ClassNotFoundException is thrown, depending on the value on the
294 // throw_error flag. For most uses the throw_error argument should be set
295 // to true.
296
297 static Klass* resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS);
298 // Convenient call for null loader and protection domain.
299 static Klass* resolve_or_fail(Symbol* class_name, bool throw_error, TRAPS);
300 protected:
301 // handle error translation for resolve_or_null results
302 static Klass* handle_resolution_exception(Symbol* class_name, bool throw_error, Klass* klass, TRAPS);
303
304 public:
305
306 // Returns a class with a given class name and class loader.
307 // Loads the class if needed. If not found NULL is returned.
308 static Klass* resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
309 // Version with null loader and protection domain
310 static Klass* resolve_or_null(Symbol* class_name, TRAPS);
311
312 // Resolve a superclass or superinterface. Called from ClassFileParser,
313 // parse_interfaces, resolve_instance_class_or_null, load_shared_class
314 // "child_name" is the class whose super class or interface is being resolved.
315 static InstanceKlass* resolve_super_or_fail(Symbol* child_name,
316 Symbol* class_name,
317 Handle class_loader,
318 Handle protection_domain,
319 bool is_superclass,
320 TRAPS);
321
322 // Parse new stream. This won't update the dictionary or class
323 // hierarchy, simply parse the stream. Used by JVMTI RedefineClasses
324 // and by Unsafe_DefineAnonymousClass and jvm_lookup_define_class.
325 static InstanceKlass* parse_stream(Symbol* class_name,
326 Handle class_loader,
327 ClassFileStream* st,
328 const ClassLoadInfo& cl_info,
329 TRAPS);
330
331 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass)
332 static InstanceKlass* resolve_from_stream(Symbol* class_name,
333 Handle class_loader,
334 Handle protection_domain,
335 ClassFileStream* st,
336 TRAPS);
337
338 // Lookup an already loaded class. If not found NULL is returned.
339 static Klass* find(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
340
341 // Lookup an already loaded instance or array class.
342 // Do not make any queries to class loaders; consult only the cache.
343 // If not found NULL is returned.
344 static Klass* find_instance_or_array_klass(Symbol* class_name,
345 Handle class_loader,
346 Handle protection_domain,
347 TRAPS);
348
349 // Lookup an instance or array class that has already been loaded
350 // either into the given class loader, or else into another class
351 // loader that is constrained (via loader constraints) to produce
352 // a consistent class. Do not take protection domains into account.
353 // Do not make any queries to class loaders; consult only the cache.
354 // Return NULL if the class is not found.
355 //
356 // This function is a strict superset of find_instance_or_array_klass.
357 // This function (the unchecked version) makes a conservative prediction
358 // of the result of the checked version, assuming successful lookup.
359 // If both functions return non-null, they must return the same value.
360 // Also, the unchecked version may sometimes be non-null where the
361 // checked version is null. This can occur in several ways:
362 // 1. No query has yet been made to the class loader.
363 // 2. The class loader was queried, but chose not to delegate.
364 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain.
365 // 4. Loading was attempted, but there was a linkage error of some sort.
366 // In all of these cases, the loader constraints on this type are
367 // satisfied, and it is safe for classes in the given class loader
368 // to manipulate strongly-typed values of the found class, subject
369 // to local linkage and access checks.
370 static Klass* find_constrained_instance_or_array_klass(Symbol* class_name,
371 Handle class_loader,
372 TRAPS);
373
374 static void classes_do(MetaspaceClosure* it);
375 // Iterate over all methods in all klasses
376
377 static void methods_do(void f(Method*));
378
379 // Garbage collection support
380
381 // Unload (that is, break root links to) all unmarked classes and
382 // loaders. Returns "true" iff something was unloaded.
383 static bool do_unloading(GCTimer* gc_timer);
384
385 // Applies "f->do_oop" to all root oops in the system dictionary.
386 // If include_handles is true (the default), then the handles in the
387 // vm_global OopStorage object are included.
388 static void oops_do(OopClosure* f, bool include_handles = true);
389
390 // System loader lock
391 static oop system_loader_lock() { return _system_loader_lock_obj; }
392
393 // Protection Domain Table
394 static ProtectionDomainCacheTable* pd_cache_table() { return _pd_cache_table; }
395
396 public:
397 // Printing
398 static void print();
399 static void print_on(outputStream* st);
400 static void dump(outputStream* st, bool verbose);
401
402 // Verification
403 static void verify();
404
405 // Initialization
406 static void initialize(TRAPS);
407
408 // Checked fast access to the well-known classes -- so that you don't try to use them
409 // before they are resolved.
410 static InstanceKlass* check_klass(InstanceKlass* k) {
411 assert(k != NULL, "klass not loaded");
412 return k;
413 }
414
415 static bool resolve_wk_klass(WKID id, TRAPS);
416 static void resolve_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS);
417 static void resolve_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) {
418 int limit = (int)end_id + 1;
419 resolve_wk_klasses_until((WKID) limit, start_id, THREAD);
420 }
421 public:
422 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]
423
424 #define WK_KLASS_DECLARE(name, symbol) \
425 static InstanceKlass* name() { return check_klass(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } \
426 static InstanceKlass** name##_addr() { \
427 return &_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \
428 } \
429 static bool name##_is_loaded() { \
430 return is_wk_klass_loaded(WK_KLASS(name)); \
431 }
432 WK_KLASSES_DO(WK_KLASS_DECLARE);
433 #undef WK_KLASS_DECLARE
434
435 static InstanceKlass* well_known_klass(WKID id) {
436 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob");
437 return _well_known_klasses[id];
438 }
439
440 static InstanceKlass** well_known_klass_addr(WKID id) {
441 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob");
442 return &_well_known_klasses[id];
443 }
444 static void well_known_klasses_do(MetaspaceClosure* it);
445
446 static InstanceKlass* box_klass(BasicType t) {
447 assert((uint)t < T_VOID+1, "range check");
448 return check_klass(_box_klasses[t]);
449 }
450 static BasicType box_klass_type(Klass* k); // inverse of box_klass
451 #ifdef ASSERT
452 static bool is_well_known_klass(Klass* k) {
453 return is_well_known_klass(k->name());
454 }
455 static bool is_well_known_klass(Symbol* class_name);
456 #endif
457
458 protected:
459 // Returns the class loader data to be used when looking up/updating the
460 // system dictionary.
461 static ClassLoaderData *class_loader_data(Handle class_loader) {
462 return ClassLoaderData::class_loader_data(class_loader());
463 }
464
465 static bool is_wk_klass_loaded(InstanceKlass* klass) {
466 return !(klass == NULL || !klass->is_loaded());
467 }
468
469 public:
470 static bool Object_klass_loaded() { return is_wk_klass_loaded(WK_KLASS(Object_klass)); }
471 static bool Class_klass_loaded() { return is_wk_klass_loaded(WK_KLASS(Class_klass)); }
472 static bool Cloneable_klass_loaded() { return is_wk_klass_loaded(WK_KLASS(Cloneable_klass)); }
473 static bool Parameter_klass_loaded() { return is_wk_klass_loaded(WK_KLASS(reflect_Parameter_klass)); }
474 static bool ClassLoader_klass_loaded() { return is_wk_klass_loaded(WK_KLASS(ClassLoader_klass)); }
475
476 // Returns java system loader
477 static oop java_system_loader();
478
479 // Returns java platform loader
480 static oop java_platform_loader();
481
482 // Compute the java system and platform loaders
483 static void compute_java_loaders(TRAPS);
484
485 // Register a new class loader
486 static ClassLoaderData* register_loader(Handle class_loader, bool create_mirror_cld = false);
487 protected:
488 // Mirrors for primitive classes (created eagerly)
489 static oop check_mirror(oop m) {
490 assert(m != NULL, "mirror not initialized");
491 return m;
492 }
493
494 public:
495 // Note: java_lang_Class::primitive_type is the inverse of java_mirror
496
497 // Check class loader constraints
498 static bool add_loader_constraint(Symbol* name, Klass* klass_being_linked, Handle loader1,
499 Handle loader2, TRAPS);
500 static Symbol* check_signature_loaders(Symbol* signature, Klass* klass_being_linked,
501 Handle loader1, Handle loader2, bool is_method, TRAPS);
502
503 // JSR 292
504 // find a java.lang.invoke.MethodHandle.invoke* method for a given signature
505 // (asks Java to compute it if necessary, except in a compiler thread)
506 static Method* find_method_handle_invoker(Klass* klass,
507 Symbol* name,
508 Symbol* signature,
509 Klass* accessing_klass,
510 Handle *appendix_result,
511 TRAPS);
512 // for a given signature, find the internal MethodHandle method (linkTo* or invokeBasic)
513 // (does not ask Java, since this is a low-level intrinsic defined by the JVM)
514 static Method* find_method_handle_intrinsic(vmIntrinsics::ID iid,
515 Symbol* signature,
516 TRAPS);
517
518 // compute java_mirror (java.lang.Class instance) for a type ("I", "[[B", "LFoo;", etc.)
519 // Either the accessing_klass or the CL/PD can be non-null, but not both.
520 static Handle find_java_mirror_for_type(Symbol* signature,
521 Klass* accessing_klass,
522 Handle class_loader,
523 Handle protection_domain,
524 SignatureStream::FailureMode failure_mode,
525 TRAPS);
526 static Handle find_java_mirror_for_type(Symbol* signature,
527 Klass* accessing_klass,
528 SignatureStream::FailureMode failure_mode,
529 TRAPS) {
530 // callee will fill in CL/PD from AK, if they are needed
531 return find_java_mirror_for_type(signature, accessing_klass, Handle(), Handle(),
532 failure_mode, THREAD);
533 }
534
535 // find a java.lang.invoke.MethodType object for a given signature
536 // (asks Java to compute it if necessary, except in a compiler thread)
537 static Handle find_method_handle_type(Symbol* signature,
538 Klass* accessing_klass,
539 TRAPS);
540
541 // find a java.lang.Class object for a given signature
542 static Handle find_field_handle_type(Symbol* signature,
543 Klass* accessing_klass,
544 TRAPS);
545
546 // ask Java to compute a java.lang.invoke.MethodHandle object for a given CP entry
547 static Handle link_method_handle_constant(Klass* caller,
548 int ref_kind, //e.g., JVM_REF_invokeVirtual
549 Klass* callee,
550 Symbol* name,
551 Symbol* signature,
552 TRAPS);
553
554 // ask Java to compute a constant by invoking a BSM given a Dynamic_info CP entry
555 static void invoke_bootstrap_method(BootstrapInfo& bootstrap_specifier, TRAPS);
556
557 // Record the error when the first attempt to resolve a reference from a constant
558 // pool entry to a class fails.
559 static void add_resolution_error(const constantPoolHandle& pool, int which, Symbol* error,
560 Symbol* message);
561 static void delete_resolution_error(ConstantPool* pool);
562 static Symbol* find_resolution_error(const constantPoolHandle& pool, int which,
563 Symbol** message);
564
565
566 // Record a nest host resolution/validation error
567 static void add_nest_host_error(const constantPoolHandle& pool, int which,
568 const char* message);
569 static const char* find_nest_host_error(const constantPoolHandle& pool, int which);
570
571 static ProtectionDomainCacheEntry* cache_get(Handle protection_domain);
572
573 protected:
574
575 enum Constants {
576 _loader_constraint_size = 107, // number of entries in constraint table
577 _resolution_error_size = 107, // number of entries in resolution error table
578 _invoke_method_size = 139, // number of entries in invoke method table
579 _placeholder_table_size = 1009 // number of entries in hash table for placeholders
580 };
581
582
583 // Static tables owned by the SystemDictionary
584
585 // Hashtable holding placeholders for classes being loaded.
586 static PlaceholderTable* _placeholders;
587
588 // Lock object for system class loader
589 static oop _system_loader_lock_obj;
590
591 // Constraints on class loaders
592 static LoaderConstraintTable* _loader_constraints;
593
594 // Resolution errors
595 static ResolutionErrorTable* _resolution_errors;
596
597 // Invoke methods (JSR 292)
598 static SymbolPropertyTable* _invoke_method_table;
599
600 // ProtectionDomain cache
601 static ProtectionDomainCacheTable* _pd_cache_table;
602
603 protected:
604 static void validate_protection_domain(InstanceKlass* klass,
605 Handle class_loader,
606 Handle protection_domain, TRAPS);
607
608 friend class VM_PopulateDumpSharedSpace;
609 friend class TraversePlaceholdersClosure;
610 static PlaceholderTable* placeholders() { return _placeholders; }
611 static LoaderConstraintTable* constraints() { return _loader_constraints; }
612 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; }
613 static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; }
614 static void post_class_load_event(EventClassLoad* event, const InstanceKlass* k, const ClassLoaderData* init_cld);
615
616 // Basic loading operations
617 static InstanceKlass* resolve_instance_class_or_null_helper(Symbol* name,
618 Handle class_loader,
619 Handle protection_domain,
620 TRAPS);
621 static InstanceKlass* resolve_instance_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
622 static Klass* resolve_array_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
623 static InstanceKlass* handle_parallel_super_load(Symbol* class_name, Symbol* supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS);
624 // Wait on SystemDictionary_lock; unlocks lockObject before
625 // waiting; relocks lockObject with correct recursion count
626 // after waiting, but before reentering SystemDictionary_lock
627 // to preserve lock order semantics.
628 static void double_lock_wait(Handle lockObject, TRAPS);
629 static void define_instance_class(InstanceKlass* k, TRAPS);
630 static InstanceKlass* find_or_define_instance_class(Symbol* class_name,
631 Handle class_loader,
632 InstanceKlass* k, TRAPS);
633 static bool is_shared_class_visible(Symbol* class_name, InstanceKlass* ik,
634 PackageEntry* pkg_entry,
635 Handle class_loader, TRAPS);
636 static bool check_shared_class_super_type(InstanceKlass* child, InstanceKlass* super,
637 Handle class_loader, Handle protection_domain,
638 bool is_superclass, TRAPS);
639 static bool check_shared_class_super_types(InstanceKlass* ik, Handle class_loader,
640 Handle protection_domain, TRAPS);
641 static InstanceKlass* load_shared_lambda_proxy_class(InstanceKlass* ik,
642 Handle class_loader,
643 Handle protection_domain,
644 PackageEntry* pkg_entry,
645 TRAPS);
646 static InstanceKlass* load_shared_class(InstanceKlass* ik,
647 Handle class_loader,
648 Handle protection_domain,
649 const ClassFileStream *cfs,
650 PackageEntry* pkg_entry,
651 TRAPS);
652 // Second part of load_shared_class
653 static void load_shared_class_misc(InstanceKlass* ik, ClassLoaderData* loader_data, TRAPS) NOT_CDS_RETURN;
654 static InstanceKlass* load_shared_boot_class(Symbol* class_name,
655 PackageEntry* pkg_entry,
656 TRAPS);
657 static InstanceKlass* load_instance_class(Symbol* class_name, Handle class_loader, TRAPS);
658 static Handle compute_loader_lock_object(Handle class_loader, TRAPS);
659 static void check_loader_lock_contention(Handle loader_lock, TRAPS);
660 static bool is_parallelCapable(Handle class_loader);
661 static bool is_parallelDefine(Handle class_loader);
662
663 public:
664 static bool is_system_class_loader(oop class_loader);
665 static bool is_platform_class_loader(oop class_loader);
666 static bool is_boot_class_loader(oop class_loader) { return class_loader == NULL; }
667 static bool is_builtin_class_loader(oop class_loader) {
668 return is_boot_class_loader(class_loader) ||
669 is_platform_class_loader(class_loader) ||
670 is_system_class_loader(class_loader);
671 }
672 // Returns TRUE if the method is a non-public member of class java.lang.Object.
673 static bool is_nonpublic_Object_method(Method* m) {
674 assert(m != NULL, "Unexpected NULL Method*");
675 return !m->is_public() && m->method_holder() == SystemDictionary::Object_klass();
676 }
677
678 // Return Symbol or throw exception if name given is can not be a valid Symbol.
679 static Symbol* class_name_symbol(const char* name, Symbol* exception, TRAPS);
680
681 protected:
682 // Setup link to hierarchy
683 static void add_to_hierarchy(InstanceKlass* k, TRAPS);
684
685 // Basic find on loaded classes
686 static InstanceKlass* find_class(unsigned int hash,
687 Symbol* name, Dictionary* dictionary);
688 static InstanceKlass* find_class(Symbol* class_name, ClassLoaderData* loader_data);
689
690 // Basic find on classes in the midst of being loaded
691 static Symbol* find_placeholder(Symbol* name, ClassLoaderData* loader_data);
692
693 // Resolve well-known classes so they can be used like SystemDictionary::String_klass()
694 static void resolve_well_known_classes(TRAPS);
695 // quick resolve using CDS for well-known classes only.
696 static void quick_resolve(InstanceKlass* klass, ClassLoaderData* loader_data, Handle domain, TRAPS) NOT_CDS_RETURN;
697
698 // Class loader constraints
699 static void check_constraints(unsigned int hash,
700 InstanceKlass* k, Handle loader,
701 bool defining, TRAPS);
702 static void update_dictionary(unsigned int d_hash,
703 int p_index, unsigned int p_hash,
704 InstanceKlass* k, Handle loader,
705 TRAPS);
706
707 static InstanceKlass* _well_known_klasses[];
708
709 // table of box klasses (int_klass, etc.)
710 static InstanceKlass* _box_klasses[T_VOID+1];
711
712 private:
713 static oop _java_system_loader;
714 static oop _java_platform_loader;
715
716 public:
717 static TableStatistics placeholders_statistics();
718 static TableStatistics loader_constraints_statistics();
719 static TableStatistics protection_domain_cache_statistics();
720 };
721
722 #endif // SHARE_CLASSFILE_SYSTEMDICTIONARY_HPP