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