Mercurial > hg > truffle
annotate src/share/vm/classfile/systemDictionary.cpp @ 4970:33df1aeaebbf
Merge with http://hg.openjdk.java.net/hsx/hsx24/hotspot/
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Mon, 27 Feb 2012 13:10:13 +0100 |
parents | 04b9a2566eec b2cd0ee8f778 |
children | 1b8d02e10ee8 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
1552
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/dictionary.hpp" | |
27 #include "classfile/javaClasses.hpp" | |
28 #include "classfile/loaderConstraints.hpp" | |
29 #include "classfile/placeholders.hpp" | |
30 #include "classfile/resolutionErrors.hpp" | |
31 #include "classfile/systemDictionary.hpp" | |
32 #include "classfile/vmSymbols.hpp" | |
33 #include "interpreter/bytecodeStream.hpp" | |
34 #include "interpreter/interpreter.hpp" | |
35 #include "memory/gcLocker.hpp" | |
36 #include "memory/oopFactory.hpp" | |
37 #include "oops/instanceKlass.hpp" | |
38 #include "oops/instanceRefKlass.hpp" | |
39 #include "oops/klass.inline.hpp" | |
40 #include "oops/methodDataOop.hpp" | |
41 #include "oops/objArrayKlass.hpp" | |
42 #include "oops/oop.inline.hpp" | |
43 #include "oops/oop.inline2.hpp" | |
44 #include "oops/typeArrayKlass.hpp" | |
45 #include "prims/jvmtiEnvBase.hpp" | |
46 #include "prims/methodHandles.hpp" | |
47 #include "runtime/biasedLocking.hpp" | |
48 #include "runtime/fieldType.hpp" | |
49 #include "runtime/handles.inline.hpp" | |
50 #include "runtime/java.hpp" | |
51 #include "runtime/javaCalls.hpp" | |
52 #include "runtime/mutexLocker.hpp" | |
53 #include "runtime/signature.hpp" | |
54 #include "services/classLoadingService.hpp" | |
55 #include "services/threadService.hpp" | |
0 | 56 |
57 | |
1903 | 58 Dictionary* SystemDictionary::_dictionary = NULL; |
59 PlaceholderTable* SystemDictionary::_placeholders = NULL; | |
60 Dictionary* SystemDictionary::_shared_dictionary = NULL; | |
61 LoaderConstraintTable* SystemDictionary::_loader_constraints = NULL; | |
62 ResolutionErrorTable* SystemDictionary::_resolution_errors = NULL; | |
63 SymbolPropertyTable* SystemDictionary::_invoke_method_table = NULL; | |
0 | 64 |
65 | |
66 int SystemDictionary::_number_of_modifications = 0; | |
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67 int SystemDictionary::_sdgeneration = 0; |
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68 const int SystemDictionary::_primelist[_prime_array_size] = {1009,2017,4049,5051,10103, |
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69 20201,40423,99991}; |
0 | 70 |
71 oop SystemDictionary::_system_loader_lock_obj = NULL; | |
72 | |
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73 klassOop SystemDictionary::_well_known_klasses[SystemDictionary::WKID_LIMIT] |
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74 = { NULL /*, NULL...*/ }; |
0 | 75 |
76 klassOop SystemDictionary::_box_klasses[T_VOID+1] = { NULL /*, NULL...*/ }; | |
77 | |
78 oop SystemDictionary::_java_system_loader = NULL; | |
79 | |
80 bool SystemDictionary::_has_loadClassInternal = false; | |
81 bool SystemDictionary::_has_checkPackageAccess = false; | |
82 | |
83 // lazily initialized klass variables | |
84 volatile klassOop SystemDictionary::_abstract_ownable_synchronizer_klass = NULL; | |
85 | |
86 | |
87 // ---------------------------------------------------------------------------- | |
88 // Java-level SystemLoader | |
89 | |
90 oop SystemDictionary::java_system_loader() { | |
91 return _java_system_loader; | |
92 } | |
93 | |
94 void SystemDictionary::compute_java_system_loader(TRAPS) { | |
1142 | 95 KlassHandle system_klass(THREAD, WK_KLASS(ClassLoader_klass)); |
0 | 96 JavaValue result(T_OBJECT); |
97 JavaCalls::call_static(&result, | |
1142 | 98 KlassHandle(THREAD, WK_KLASS(ClassLoader_klass)), |
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99 vmSymbols::getSystemClassLoader_name(), |
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100 vmSymbols::void_classloader_signature(), |
0 | 101 CHECK); |
102 | |
103 _java_system_loader = (oop)result.get_jobject(); | |
104 } | |
105 | |
106 | |
107 // ---------------------------------------------------------------------------- | |
108 // debugging | |
109 | |
110 #ifdef ASSERT | |
111 | |
112 // return true if class_name contains no '.' (internal format is '/') | |
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113 bool SystemDictionary::is_internal_format(Symbol* class_name) { |
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114 if (class_name != NULL) { |
0 | 115 ResourceMark rm; |
116 char* name = class_name->as_C_string(); | |
117 return strchr(name, '.') == NULL; | |
118 } else { | |
119 return true; | |
120 } | |
121 } | |
122 | |
123 #endif | |
124 | |
125 // ---------------------------------------------------------------------------- | |
514 | 126 // Parallel class loading check |
127 | |
128 bool SystemDictionary::is_parallelCapable(Handle class_loader) { | |
129 if (UnsyncloadClass || class_loader.is_null()) return true; | |
130 if (AlwaysLockClassLoader) return false; | |
3938 | 131 return java_lang_ClassLoader::parallelCapable(class_loader()); |
514 | 132 } |
133 // ---------------------------------------------------------------------------- | |
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134 // ParallelDefineClass flag does not apply to bootclass loader |
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135 bool SystemDictionary::is_parallelDefine(Handle class_loader) { |
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136 if (class_loader.is_null()) return false; |
3938 | 137 if (AllowParallelDefineClass && java_lang_ClassLoader::parallelCapable(class_loader())) { |
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138 return true; |
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139 } |
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140 return false; |
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141 } |
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142 // ---------------------------------------------------------------------------- |
0 | 143 // Resolving of classes |
144 | |
145 // Forwards to resolve_or_null | |
146 | |
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147 klassOop SystemDictionary::resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS) { |
0 | 148 klassOop klass = resolve_or_null(class_name, class_loader, protection_domain, THREAD); |
149 if (HAS_PENDING_EXCEPTION || klass == NULL) { | |
150 KlassHandle k_h(THREAD, klass); | |
151 // can return a null klass | |
152 klass = handle_resolution_exception(class_name, class_loader, protection_domain, throw_error, k_h, THREAD); | |
153 } | |
154 return klass; | |
155 } | |
156 | |
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157 klassOop SystemDictionary::handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS) { |
0 | 158 if (HAS_PENDING_EXCEPTION) { |
159 // If we have a pending exception we forward it to the caller, unless throw_error is true, | |
160 // in which case we have to check whether the pending exception is a ClassNotFoundException, | |
161 // and if so convert it to a NoClassDefFoundError | |
162 // And chain the original ClassNotFoundException | |
1142 | 163 if (throw_error && PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass())) { |
0 | 164 ResourceMark rm(THREAD); |
165 assert(klass_h() == NULL, "Should not have result with exception pending"); | |
166 Handle e(THREAD, PENDING_EXCEPTION); | |
167 CLEAR_PENDING_EXCEPTION; | |
168 THROW_MSG_CAUSE_0(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string(), e); | |
169 } else { | |
170 return NULL; | |
171 } | |
172 } | |
173 // Class not found, throw appropriate error or exception depending on value of throw_error | |
174 if (klass_h() == NULL) { | |
175 ResourceMark rm(THREAD); | |
176 if (throw_error) { | |
177 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string()); | |
178 } else { | |
179 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), class_name->as_C_string()); | |
180 } | |
181 } | |
182 return (klassOop)klass_h(); | |
183 } | |
184 | |
185 | |
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186 klassOop SystemDictionary::resolve_or_fail(Symbol* class_name, |
0 | 187 bool throw_error, TRAPS) |
188 { | |
189 return resolve_or_fail(class_name, Handle(), Handle(), throw_error, THREAD); | |
190 } | |
191 | |
192 | |
193 // Forwards to resolve_instance_class_or_null | |
194 | |
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195 klassOop SystemDictionary::resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS) { |
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196 // (tw) May we do this? |
2181 | 197 //assert(!THREAD->is_Compiler_thread(), "Can not load classes with the Compiler thread"); |
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198 if (FieldType::is_array(class_name)) { |
0 | 199 return resolve_array_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); |
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200 } else if (FieldType::is_obj(class_name)) { |
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201 ResourceMark rm(THREAD); |
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202 // Ignore wrapping L and ;. |
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203 TempNewSymbol name = SymbolTable::new_symbol(class_name->as_C_string() + 1, |
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204 class_name->utf8_length() - 2, CHECK_NULL); |
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205 return resolve_instance_class_or_null(name, class_loader, protection_domain, CHECK_NULL); |
0 | 206 } else { |
207 return resolve_instance_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); | |
208 } | |
209 } | |
210 | |
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211 klassOop SystemDictionary::resolve_or_null(Symbol* class_name, TRAPS) { |
0 | 212 return resolve_or_null(class_name, Handle(), Handle(), THREAD); |
213 } | |
214 | |
215 // Forwards to resolve_instance_class_or_null | |
216 | |
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217 klassOop SystemDictionary::resolve_array_class_or_null(Symbol* class_name, |
0 | 218 Handle class_loader, |
219 Handle protection_domain, | |
220 TRAPS) { | |
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221 assert(FieldType::is_array(class_name), "must be array"); |
0 | 222 klassOop k = NULL; |
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223 FieldArrayInfo fd; |
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224 // dimension and object_key in FieldArrayInfo are assigned as a side-effect |
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225 // of this call |
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226 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_NULL); |
0 | 227 if (t == T_OBJECT) { |
228 // naked oop "k" is OK here -- we assign back into it | |
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229 k = SystemDictionary::resolve_instance_class_or_null(fd.object_key(), |
0 | 230 class_loader, |
231 protection_domain, | |
232 CHECK_NULL); | |
233 if (k != NULL) { | |
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234 k = Klass::cast(k)->array_klass(fd.dimension(), CHECK_NULL); |
0 | 235 } |
236 } else { | |
237 k = Universe::typeArrayKlassObj(t); | |
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238 k = typeArrayKlass::cast(k)->array_klass(fd.dimension(), CHECK_NULL); |
0 | 239 } |
240 return k; | |
241 } | |
242 | |
243 | |
244 // Must be called for any super-class or super-interface resolution | |
245 // during class definition to allow class circularity checking | |
246 // super-interface callers: | |
247 // parse_interfaces - for defineClass & jvmtiRedefineClasses | |
248 // super-class callers: | |
249 // ClassFileParser - for defineClass & jvmtiRedefineClasses | |
250 // load_shared_class - while loading a class from shared archive | |
514 | 251 // resolve_instance_class_or_null: |
252 // via: handle_parallel_super_load | |
0 | 253 // when resolving a class that has an existing placeholder with |
254 // a saved superclass [i.e. a defineClass is currently in progress] | |
255 // if another thread is trying to resolve the class, it must do | |
256 // super-class checks on its own thread to catch class circularity | |
257 // This last call is critical in class circularity checking for cases | |
258 // where classloading is delegated to different threads and the | |
259 // classloader lock is released. | |
260 // Take the case: Base->Super->Base | |
261 // 1. If thread T1 tries to do a defineClass of class Base | |
262 // resolve_super_or_fail creates placeholder: T1, Base (super Super) | |
263 // 2. resolve_instance_class_or_null does not find SD or placeholder for Super | |
264 // so it tries to load Super | |
265 // 3. If we load the class internally, or user classloader uses same thread | |
266 // loadClassFromxxx or defineClass via parseClassFile Super ... | |
267 // 3.1 resolve_super_or_fail creates placeholder: T1, Super (super Base) | |
268 // 3.3 resolve_instance_class_or_null Base, finds placeholder for Base | |
269 // 3.4 calls resolve_super_or_fail Base | |
270 // 3.5 finds T1,Base -> throws class circularity | |
271 //OR 4. If T2 tries to resolve Super via defineClass Super ... | |
272 // 4.1 resolve_super_or_fail creates placeholder: T2, Super (super Base) | |
273 // 4.2 resolve_instance_class_or_null Base, finds placeholder for Base (super Super) | |
274 // 4.3 calls resolve_super_or_fail Super in parallel on own thread T2 | |
275 // 4.4 finds T2, Super -> throws class circularity | |
276 // Must be called, even if superclass is null, since this is | |
277 // where the placeholder entry is created which claims this | |
278 // thread is loading this class/classloader. | |
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279 klassOop SystemDictionary::resolve_super_or_fail(Symbol* child_name, |
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280 Symbol* class_name, |
0 | 281 Handle class_loader, |
282 Handle protection_domain, | |
283 bool is_superclass, | |
284 TRAPS) { | |
285 | |
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286 // Try to get one of the well-known klasses. |
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287 // They are trusted, and do not participate in circularities. |
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288 if (LinkWellKnownClasses) { |
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289 klassOop k = find_well_known_klass(class_name); |
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290 if (k != NULL) { |
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291 return k; |
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292 } |
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293 } |
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294 |
0 | 295 // Double-check, if child class is already loaded, just return super-class,interface |
296 // Don't add a placedholder if already loaded, i.e. already in system dictionary | |
297 // Make sure there's a placeholder for the *child* before resolving. | |
298 // Used as a claim that this thread is currently loading superclass/classloader | |
299 // Used here for ClassCircularity checks and also for heap verification | |
300 // (every instanceKlass in the heap needs to be in the system dictionary | |
301 // or have a placeholder). | |
302 // Must check ClassCircularity before checking if super class is already loaded | |
303 // | |
304 // We might not already have a placeholder if this child_name was | |
305 // first seen via resolve_from_stream (jni_DefineClass or JVM_DefineClass); | |
306 // the name of the class might not be known until the stream is actually | |
307 // parsed. | |
308 // Bugs 4643874, 4715493 | |
309 // compute_hash can have a safepoint | |
310 | |
311 unsigned int d_hash = dictionary()->compute_hash(child_name, class_loader); | |
312 int d_index = dictionary()->hash_to_index(d_hash); | |
313 unsigned int p_hash = placeholders()->compute_hash(child_name, class_loader); | |
314 int p_index = placeholders()->hash_to_index(p_hash); | |
315 // can't throw error holding a lock | |
316 bool child_already_loaded = false; | |
317 bool throw_circularity_error = false; | |
318 { | |
319 MutexLocker mu(SystemDictionary_lock, THREAD); | |
320 klassOop childk = find_class(d_index, d_hash, child_name, class_loader); | |
321 klassOop quicksuperk; | |
322 // to support // loading: if child done loading, just return superclass | |
323 // if class_name, & class_loader don't match: | |
324 // if initial define, SD update will give LinkageError | |
325 // if redefine: compare_class_versions will give HIERARCHY_CHANGED | |
326 // so we don't throw an exception here. | |
327 // see: nsk redefclass014 & java.lang.instrument Instrument032 | |
328 if ((childk != NULL ) && (is_superclass) && | |
329 ((quicksuperk = instanceKlass::cast(childk)->super()) != NULL) && | |
330 | |
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331 ((Klass::cast(quicksuperk)->name() == class_name) && |
0 | 332 (Klass::cast(quicksuperk)->class_loader() == class_loader()))) { |
333 return quicksuperk; | |
334 } else { | |
335 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, class_loader); | |
336 if (probe && probe->check_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER)) { | |
337 throw_circularity_error = true; | |
338 } | |
514 | 339 } |
340 if (!throw_circularity_error) { | |
0 | 341 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, child_name, class_loader, PlaceholderTable::LOAD_SUPER, class_name, THREAD); |
342 } | |
343 } | |
344 if (throw_circularity_error) { | |
345 ResourceMark rm(THREAD); | |
346 THROW_MSG_0(vmSymbols::java_lang_ClassCircularityError(), child_name->as_C_string()); | |
347 } | |
348 | |
349 // java.lang.Object should have been found above | |
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350 assert(class_name != NULL, "null super class for resolving"); |
0 | 351 // Resolve the super class or interface, check results on return |
352 klassOop superk = NULL; | |
353 superk = SystemDictionary::resolve_or_null(class_name, | |
354 class_loader, | |
355 protection_domain, | |
356 THREAD); | |
357 | |
358 KlassHandle superk_h(THREAD, superk); | |
359 | |
360 // Note: clean up of placeholders currently in callers of | |
361 // resolve_super_or_fail - either at update_dictionary time | |
362 // or on error | |
363 { | |
364 MutexLocker mu(SystemDictionary_lock, THREAD); | |
365 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, class_loader); | |
366 if (probe != NULL) { | |
367 probe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER); | |
368 } | |
369 } | |
370 if (HAS_PENDING_EXCEPTION || superk_h() == NULL) { | |
371 // can null superk | |
372 superk_h = KlassHandle(THREAD, handle_resolution_exception(class_name, class_loader, protection_domain, true, superk_h, THREAD)); | |
373 } | |
374 | |
375 return superk_h(); | |
376 } | |
377 | |
378 void SystemDictionary::validate_protection_domain(instanceKlassHandle klass, | |
379 Handle class_loader, | |
380 Handle protection_domain, | |
381 TRAPS) { | |
382 if(!has_checkPackageAccess()) return; | |
383 | |
384 // Now we have to call back to java to check if the initating class has access | |
385 JavaValue result(T_VOID); | |
386 if (TraceProtectionDomainVerification) { | |
387 // Print out trace information | |
388 tty->print_cr("Checking package access"); | |
389 tty->print(" - class loader: "); class_loader()->print_value_on(tty); tty->cr(); | |
390 tty->print(" - protection domain: "); protection_domain()->print_value_on(tty); tty->cr(); | |
391 tty->print(" - loading: "); klass()->print_value_on(tty); tty->cr(); | |
392 } | |
393 | |
394 assert(class_loader() != NULL, "should not have non-null protection domain for null classloader"); | |
395 | |
1142 | 396 KlassHandle system_loader(THREAD, SystemDictionary::ClassLoader_klass()); |
0 | 397 JavaCalls::call_special(&result, |
398 class_loader, | |
399 system_loader, | |
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400 vmSymbols::checkPackageAccess_name(), |
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401 vmSymbols::class_protectiondomain_signature(), |
0 | 402 Handle(THREAD, klass->java_mirror()), |
403 protection_domain, | |
404 THREAD); | |
405 | |
406 if (TraceProtectionDomainVerification) { | |
407 if (HAS_PENDING_EXCEPTION) { | |
408 tty->print_cr(" -> DENIED !!!!!!!!!!!!!!!!!!!!!"); | |
409 } else { | |
410 tty->print_cr(" -> granted"); | |
411 } | |
412 tty->cr(); | |
413 } | |
414 | |
415 if (HAS_PENDING_EXCEPTION) return; | |
416 | |
417 // If no exception has been thrown, we have validated the protection domain | |
418 // Insert the protection domain of the initiating class into the set. | |
419 { | |
420 // We recalculate the entry here -- we've called out to java since | |
421 // the last time it was calculated. | |
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422 Symbol* kn = klass->name(); |
0 | 423 unsigned int d_hash = dictionary()->compute_hash(kn, class_loader); |
424 int d_index = dictionary()->hash_to_index(d_hash); | |
425 | |
426 MutexLocker mu(SystemDictionary_lock, THREAD); | |
427 { | |
428 // Note that we have an entry, and entries can be deleted only during GC, | |
429 // so we cannot allow GC to occur while we're holding this entry. | |
430 | |
431 // We're using a No_Safepoint_Verifier to catch any place where we | |
432 // might potentially do a GC at all. | |
433 // SystemDictionary::do_unloading() asserts that classes are only | |
434 // unloaded at a safepoint. | |
435 No_Safepoint_Verifier nosafepoint; | |
436 dictionary()->add_protection_domain(d_index, d_hash, klass, class_loader, | |
437 protection_domain, THREAD); | |
438 } | |
439 } | |
440 } | |
441 | |
442 // We only get here if this thread finds that another thread | |
443 // has already claimed the placeholder token for the current operation, | |
444 // but that other thread either never owned or gave up the | |
445 // object lock | |
446 // Waits on SystemDictionary_lock to indicate placeholder table updated | |
447 // On return, caller must recheck placeholder table state | |
448 // | |
449 // We only get here if | |
450 // 1) custom classLoader, i.e. not bootstrap classloader | |
451 // 2) UnsyncloadClass not set | |
452 // 3) custom classLoader has broken the class loader objectLock | |
453 // so another thread got here in parallel | |
454 // | |
455 // lockObject must be held. | |
456 // Complicated dance due to lock ordering: | |
457 // Must first release the classloader object lock to | |
458 // allow initial definer to complete the class definition | |
459 // and to avoid deadlock | |
460 // Reclaim classloader lock object with same original recursion count | |
461 // Must release SystemDictionary_lock after notify, since | |
462 // class loader lock must be claimed before SystemDictionary_lock | |
463 // to prevent deadlocks | |
464 // | |
465 // The notify allows applications that did an untimed wait() on | |
466 // the classloader object lock to not hang. | |
467 void SystemDictionary::double_lock_wait(Handle lockObject, TRAPS) { | |
468 assert_lock_strong(SystemDictionary_lock); | |
469 | |
470 bool calledholdinglock | |
471 = ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, lockObject); | |
472 assert(calledholdinglock,"must hold lock for notify"); | |
514 | 473 assert((!(lockObject() == _system_loader_lock_obj) && !is_parallelCapable(lockObject)), "unexpected double_lock_wait"); |
0 | 474 ObjectSynchronizer::notifyall(lockObject, THREAD); |
475 intptr_t recursions = ObjectSynchronizer::complete_exit(lockObject, THREAD); | |
476 SystemDictionary_lock->wait(); | |
477 SystemDictionary_lock->unlock(); | |
478 ObjectSynchronizer::reenter(lockObject, recursions, THREAD); | |
479 SystemDictionary_lock->lock(); | |
480 } | |
481 | |
482 // If the class in is in the placeholder table, class loading is in progress | |
483 // For cases where the application changes threads to load classes, it | |
484 // is critical to ClassCircularity detection that we try loading | |
485 // the superclass on the same thread internally, so we do parallel | |
486 // super class loading here. | |
487 // This also is critical in cases where the original thread gets stalled | |
488 // even in non-circularity situations. | |
489 // Note: only one thread can define the class, but multiple can resolve | |
490 // Note: must call resolve_super_or_fail even if null super - | |
514 | 491 // to force placeholder entry creation for this class for circularity detection |
0 | 492 // Caller must check for pending exception |
493 // Returns non-null klassOop if other thread has completed load | |
494 // and we are done, | |
495 // If return null klassOop and no pending exception, the caller must load the class | |
496 instanceKlassHandle SystemDictionary::handle_parallel_super_load( | |
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497 Symbol* name, Symbol* superclassname, Handle class_loader, |
0 | 498 Handle protection_domain, Handle lockObject, TRAPS) { |
499 | |
500 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
501 unsigned int d_hash = dictionary()->compute_hash(name, class_loader); | |
502 int d_index = dictionary()->hash_to_index(d_hash); | |
503 unsigned int p_hash = placeholders()->compute_hash(name, class_loader); | |
504 int p_index = placeholders()->hash_to_index(p_hash); | |
505 | |
506 // superk is not used, resolve_super called for circularity check only | |
507 // This code is reached in two situations. One if this thread | |
508 // is loading the same class twice (e.g. ClassCircularity, or | |
509 // java.lang.instrument). | |
510 // The second is if another thread started the resolve_super first | |
511 // and has not yet finished. | |
512 // In both cases the original caller will clean up the placeholder | |
513 // entry on error. | |
514 klassOop superk = SystemDictionary::resolve_super_or_fail(name, | |
515 superclassname, | |
516 class_loader, | |
517 protection_domain, | |
518 true, | |
519 CHECK_(nh)); | |
520 // We don't redefine the class, so we just need to clean up if there | |
521 // was not an error (don't want to modify any system dictionary | |
522 // data structures). | |
523 { | |
524 MutexLocker mu(SystemDictionary_lock, THREAD); | |
525 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
526 SystemDictionary_lock->notify_all(); | |
527 } | |
528 | |
514 | 529 // parallelCapable class loaders do NOT wait for parallel superclass loads to complete |
530 // Serial class loaders and bootstrap classloader do wait for superclass loads | |
531 if (!class_loader.is_null() && is_parallelCapable(class_loader)) { | |
0 | 532 MutexLocker mu(SystemDictionary_lock, THREAD); |
533 // Check if classloading completed while we were loading superclass or waiting | |
534 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
535 if (check != NULL) { | |
536 // Klass is already loaded, so just return it | |
537 return(instanceKlassHandle(THREAD, check)); | |
538 } else { | |
539 return nh; | |
540 } | |
541 } | |
542 | |
543 // must loop to both handle other placeholder updates | |
544 // and spurious notifications | |
545 bool super_load_in_progress = true; | |
546 PlaceholderEntry* placeholder; | |
547 while (super_load_in_progress) { | |
548 MutexLocker mu(SystemDictionary_lock, THREAD); | |
549 // Check if classloading completed while we were loading superclass or waiting | |
550 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
551 if (check != NULL) { | |
552 // Klass is already loaded, so just return it | |
553 return(instanceKlassHandle(THREAD, check)); | |
554 } else { | |
555 placeholder = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
556 if (placeholder && placeholder->super_load_in_progress() ){ | |
557 // Before UnsyncloadClass: | |
558 // We only get here if the application has released the | |
559 // classloader lock when another thread was in the middle of loading a | |
560 // superclass/superinterface for this class, and now | |
561 // this thread is also trying to load this class. | |
562 // To minimize surprises, the first thread that started to | |
563 // load a class should be the one to complete the loading | |
564 // with the classfile it initially expected. | |
565 // This logic has the current thread wait once it has done | |
566 // all the superclass/superinterface loading it can, until | |
567 // the original thread completes the class loading or fails | |
568 // If it completes we will use the resulting instanceKlass | |
569 // which we will find below in the systemDictionary. | |
570 // We also get here for parallel bootstrap classloader | |
571 if (class_loader.is_null()) { | |
572 SystemDictionary_lock->wait(); | |
573 } else { | |
574 double_lock_wait(lockObject, THREAD); | |
575 } | |
576 } else { | |
577 // If not in SD and not in PH, other thread's load must have failed | |
578 super_load_in_progress = false; | |
579 } | |
580 } | |
581 } | |
582 return (nh); | |
583 } | |
584 | |
585 | |
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586 klassOop SystemDictionary::resolve_instance_class_or_null(Symbol* name, Handle class_loader, Handle protection_domain, TRAPS) { |
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587 assert(name != NULL && !FieldType::is_array(name) && |
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588 !FieldType::is_obj(name), "invalid class name"); |
0 | 589 |
590 // UseNewReflection | |
591 // Fix for 4474172; see evaluation for more details | |
592 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); | |
593 | |
594 // Do lookup to see if class already exist and the protection domain | |
595 // has the right access | |
596 unsigned int d_hash = dictionary()->compute_hash(name, class_loader); | |
597 int d_index = dictionary()->hash_to_index(d_hash); | |
598 klassOop probe = dictionary()->find(d_index, d_hash, name, class_loader, | |
599 protection_domain, THREAD); | |
600 if (probe != NULL) return probe; | |
601 | |
602 | |
603 // Non-bootstrap class loaders will call out to class loader and | |
604 // define via jvm/jni_DefineClass which will acquire the | |
605 // class loader object lock to protect against multiple threads | |
606 // defining the class in parallel by accident. | |
607 // This lock must be acquired here so the waiter will find | |
608 // any successful result in the SystemDictionary and not attempt | |
609 // the define | |
514 | 610 // ParallelCapable Classloaders and the bootstrap classloader, |
0 | 611 // or all classloaders with UnsyncloadClass do not acquire lock here |
612 bool DoObjectLock = true; | |
514 | 613 if (is_parallelCapable(class_loader)) { |
0 | 614 DoObjectLock = false; |
615 } | |
616 | |
617 unsigned int p_hash = placeholders()->compute_hash(name, class_loader); | |
618 int p_index = placeholders()->hash_to_index(p_hash); | |
619 | |
620 // Class is not in SystemDictionary so we have to do loading. | |
621 // Make sure we are synchronized on the class loader before we proceed | |
622 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
623 check_loader_lock_contention(lockObject, THREAD); | |
624 ObjectLocker ol(lockObject, THREAD, DoObjectLock); | |
625 | |
626 // Check again (after locking) if class already exist in SystemDictionary | |
627 bool class_has_been_loaded = false; | |
628 bool super_load_in_progress = false; | |
629 bool havesupername = false; | |
630 instanceKlassHandle k; | |
631 PlaceholderEntry* placeholder; | |
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632 Symbol* superclassname = NULL; |
0 | 633 |
634 { | |
635 MutexLocker mu(SystemDictionary_lock, THREAD); | |
636 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
637 if (check != NULL) { | |
638 // Klass is already loaded, so just return it | |
639 class_has_been_loaded = true; | |
640 k = instanceKlassHandle(THREAD, check); | |
641 } else { | |
642 placeholder = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
643 if (placeholder && placeholder->super_load_in_progress()) { | |
644 super_load_in_progress = true; | |
645 if (placeholder->havesupername() == true) { | |
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646 superclassname = placeholder->supername(); |
0 | 647 havesupername = true; |
648 } | |
649 } | |
650 } | |
651 } | |
652 | |
653 // If the class in is in the placeholder table, class loading is in progress | |
654 if (super_load_in_progress && havesupername==true) { | |
655 k = SystemDictionary::handle_parallel_super_load(name, superclassname, | |
656 class_loader, protection_domain, lockObject, THREAD); | |
657 if (HAS_PENDING_EXCEPTION) { | |
658 return NULL; | |
659 } | |
660 if (!k.is_null()) { | |
661 class_has_been_loaded = true; | |
662 } | |
663 } | |
664 | |
665 if (!class_has_been_loaded) { | |
666 | |
667 // add placeholder entry to record loading instance class | |
668 // Five cases: | |
669 // All cases need to prevent modifying bootclasssearchpath | |
670 // in parallel with a classload of same classname | |
514 | 671 // Redefineclasses uses existence of the placeholder for the duration |
672 // of the class load to prevent concurrent redefinition of not completely | |
673 // defined classes. | |
0 | 674 // case 1. traditional classloaders that rely on the classloader object lock |
675 // - no other need for LOAD_INSTANCE | |
676 // case 2. traditional classloaders that break the classloader object lock | |
677 // as a deadlock workaround. Detection of this case requires that | |
678 // this check is done while holding the classloader object lock, | |
679 // and that lock is still held when calling classloader's loadClass. | |
680 // For these classloaders, we ensure that the first requestor | |
681 // completes the load and other requestors wait for completion. | |
682 // case 3. UnsyncloadClass - don't use objectLocker | |
683 // With this flag, we allow parallel classloading of a | |
684 // class/classloader pair | |
685 // case4. Bootstrap classloader - don't own objectLocker | |
686 // This classloader supports parallelism at the classloader level, | |
687 // but only allows a single load of a class/classloader pair. | |
688 // No performance benefit and no deadlock issues. | |
514 | 689 // case 5. parallelCapable user level classloaders - without objectLocker |
690 // Allow parallel classloading of a class/classloader pair | |
0 | 691 bool throw_circularity_error = false; |
692 { | |
693 MutexLocker mu(SystemDictionary_lock, THREAD); | |
514 | 694 if (class_loader.is_null() || !is_parallelCapable(class_loader)) { |
0 | 695 PlaceholderEntry* oldprobe = placeholders()->get_entry(p_index, p_hash, name, class_loader); |
696 if (oldprobe) { | |
697 // only need check_seen_thread once, not on each loop | |
698 // 6341374 java/lang/Instrument with -Xcomp | |
699 if (oldprobe->check_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE)) { | |
700 throw_circularity_error = true; | |
701 } else { | |
702 // case 1: traditional: should never see load_in_progress. | |
703 while (!class_has_been_loaded && oldprobe && oldprobe->instance_load_in_progress()) { | |
704 | |
705 // case 4: bootstrap classloader: prevent futile classloading, | |
706 // wait on first requestor | |
707 if (class_loader.is_null()) { | |
708 SystemDictionary_lock->wait(); | |
709 } else { | |
710 // case 2: traditional with broken classloader lock. wait on first | |
711 // requestor. | |
712 double_lock_wait(lockObject, THREAD); | |
713 } | |
714 // Check if classloading completed while we were waiting | |
715 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
716 if (check != NULL) { | |
717 // Klass is already loaded, so just return it | |
718 k = instanceKlassHandle(THREAD, check); | |
719 class_has_been_loaded = true; | |
720 } | |
721 // check if other thread failed to load and cleaned up | |
722 oldprobe = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
723 } | |
724 } | |
725 } | |
726 } | |
727 // All cases: add LOAD_INSTANCE | |
514 | 728 // case 3: UnsyncloadClass || case 5: parallelCapable: allow competing threads to try |
0 | 729 // LOAD_INSTANCE in parallel |
730 // add placeholder entry even if error - callers will remove on error | |
514 | 731 if (!throw_circularity_error && !class_has_been_loaded) { |
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732 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, name, class_loader, PlaceholderTable::LOAD_INSTANCE, NULL, THREAD); |
0 | 733 // For class loaders that do not acquire the classloader object lock, |
734 // if they did not catch another thread holding LOAD_INSTANCE, | |
735 // need a check analogous to the acquire ObjectLocker/find_class | |
736 // i.e. now that we hold the LOAD_INSTANCE token on loading this class/CL | |
737 // one final check if the load has already completed | |
514 | 738 // class loaders holding the ObjectLock shouldn't find the class here |
0 | 739 klassOop check = find_class(d_index, d_hash, name, class_loader); |
740 if (check != NULL) { | |
741 // Klass is already loaded, so just return it | |
742 k = instanceKlassHandle(THREAD, check); | |
743 class_has_been_loaded = true; | |
744 newprobe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE); | |
514 | 745 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); |
746 SystemDictionary_lock->notify_all(); | |
0 | 747 } |
748 } | |
749 } | |
750 // must throw error outside of owning lock | |
751 if (throw_circularity_error) { | |
752 ResourceMark rm(THREAD); | |
753 THROW_MSG_0(vmSymbols::java_lang_ClassCircularityError(), name->as_C_string()); | |
754 } | |
755 | |
756 if (!class_has_been_loaded) { | |
757 | |
758 // Do actual loading | |
759 k = load_instance_class(name, class_loader, THREAD); | |
760 | |
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761 // For UnsyncloadClass only |
0 | 762 // If they got a linkageError, check if a parallel class load succeeded. |
763 // If it did, then for bytecode resolution the specification requires | |
764 // that we return the same result we did for the other thread, i.e. the | |
765 // successfully loaded instanceKlass | |
766 // Should not get here for classloaders that support parallelism | |
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767 // with the new cleaner mechanism, even with AllowParallelDefineClass |
514 | 768 // Bootstrap goes through here to allow for an extra guarantee check |
0 | 769 if (UnsyncloadClass || (class_loader.is_null())) { |
770 if (k.is_null() && HAS_PENDING_EXCEPTION | |
1142 | 771 && PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { |
0 | 772 MutexLocker mu(SystemDictionary_lock, THREAD); |
773 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
774 if (check != NULL) { | |
775 // Klass is already loaded, so just use it | |
776 k = instanceKlassHandle(THREAD, check); | |
777 CLEAR_PENDING_EXCEPTION; | |
778 guarantee((!class_loader.is_null()), "dup definition for bootstrap loader?"); | |
779 } | |
780 } | |
781 } | |
782 | |
783 // clean up placeholder entries for success or error | |
784 // This cleans up LOAD_INSTANCE entries | |
785 // It also cleans up LOAD_SUPER entries on errors from | |
786 // calling load_instance_class | |
787 { | |
788 MutexLocker mu(SystemDictionary_lock, THREAD); | |
789 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
790 if (probe != NULL) { | |
791 probe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE); | |
792 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
793 SystemDictionary_lock->notify_all(); | |
794 } | |
795 } | |
796 | |
797 // If everything was OK (no exceptions, no null return value), and | |
798 // class_loader is NOT the defining loader, do a little more bookkeeping. | |
799 if (!HAS_PENDING_EXCEPTION && !k.is_null() && | |
800 k->class_loader() != class_loader()) { | |
801 | |
802 check_constraints(d_index, d_hash, k, class_loader, false, THREAD); | |
803 | |
804 // Need to check for a PENDING_EXCEPTION again; check_constraints | |
805 // can throw and doesn't use the CHECK macro. | |
806 if (!HAS_PENDING_EXCEPTION) { | |
807 { // Grabbing the Compile_lock prevents systemDictionary updates | |
808 // during compilations. | |
809 MutexLocker mu(Compile_lock, THREAD); | |
810 update_dictionary(d_index, d_hash, p_index, p_hash, | |
811 k, class_loader, THREAD); | |
812 } | |
813 if (JvmtiExport::should_post_class_load()) { | |
814 Thread *thread = THREAD; | |
815 assert(thread->is_Java_thread(), "thread->is_Java_thread()"); | |
816 JvmtiExport::post_class_load((JavaThread *) thread, k()); | |
817 } | |
818 } | |
819 } | |
820 if (HAS_PENDING_EXCEPTION || k.is_null()) { | |
821 // On error, clean up placeholders | |
822 { | |
823 MutexLocker mu(SystemDictionary_lock, THREAD); | |
824 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
825 SystemDictionary_lock->notify_all(); | |
826 } | |
827 return NULL; | |
828 } | |
829 } | |
830 } | |
831 | |
832 #ifdef ASSERT | |
833 { | |
834 Handle loader (THREAD, k->class_loader()); | |
835 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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836 oop kk = find_class(name, loader); |
0 | 837 assert(kk == k(), "should be present in dictionary"); |
838 } | |
839 #endif | |
840 | |
841 // return if the protection domain in NULL | |
842 if (protection_domain() == NULL) return k(); | |
843 | |
844 // Check the protection domain has the right access | |
845 { | |
846 MutexLocker mu(SystemDictionary_lock, THREAD); | |
847 // Note that we have an entry, and entries can be deleted only during GC, | |
848 // so we cannot allow GC to occur while we're holding this entry. | |
849 // We're using a No_Safepoint_Verifier to catch any place where we | |
850 // might potentially do a GC at all. | |
851 // SystemDictionary::do_unloading() asserts that classes are only | |
852 // unloaded at a safepoint. | |
853 No_Safepoint_Verifier nosafepoint; | |
854 if (dictionary()->is_valid_protection_domain(d_index, d_hash, name, | |
855 class_loader, | |
856 protection_domain)) { | |
857 return k(); | |
858 } | |
859 } | |
860 | |
861 // Verify protection domain. If it fails an exception is thrown | |
862 validate_protection_domain(k, class_loader, protection_domain, CHECK_(klassOop(NULL))); | |
863 | |
864 return k(); | |
865 } | |
866 | |
867 | |
868 // This routine does not lock the system dictionary. | |
869 // | |
870 // Since readers don't hold a lock, we must make sure that system | |
871 // dictionary entries are only removed at a safepoint (when only one | |
872 // thread is running), and are added to in a safe way (all links must | |
873 // be updated in an MT-safe manner). | |
874 // | |
875 // Callers should be aware that an entry could be added just after | |
876 // _dictionary->bucket(index) is read here, so the caller will not see | |
877 // the new entry. | |
878 | |
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879 klassOop SystemDictionary::find(Symbol* class_name, |
0 | 880 Handle class_loader, |
881 Handle protection_domain, | |
882 TRAPS) { | |
883 | |
556
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884 // UseNewReflection |
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885 // The result of this call should be consistent with the result |
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886 // of the call to resolve_instance_class_or_null(). |
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887 // See evaluation 6790209 and 4474172 for more details. |
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888 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); |
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889 |
0 | 890 unsigned int d_hash = dictionary()->compute_hash(class_name, class_loader); |
891 int d_index = dictionary()->hash_to_index(d_hash); | |
892 | |
893 { | |
894 // Note that we have an entry, and entries can be deleted only during GC, | |
895 // so we cannot allow GC to occur while we're holding this entry. | |
896 // We're using a No_Safepoint_Verifier to catch any place where we | |
897 // might potentially do a GC at all. | |
898 // SystemDictionary::do_unloading() asserts that classes are only | |
899 // unloaded at a safepoint. | |
900 No_Safepoint_Verifier nosafepoint; | |
901 return dictionary()->find(d_index, d_hash, class_name, class_loader, | |
902 protection_domain, THREAD); | |
903 } | |
904 } | |
905 | |
906 | |
907 // Look for a loaded instance or array klass by name. Do not do any loading. | |
908 // return NULL in case of error. | |
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909 klassOop SystemDictionary::find_instance_or_array_klass(Symbol* class_name, |
0 | 910 Handle class_loader, |
911 Handle protection_domain, | |
912 TRAPS) { | |
913 klassOop k = NULL; | |
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914 assert(class_name != NULL, "class name must be non NULL"); |
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915 |
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916 // Try to get one of the well-known klasses. |
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917 if (LinkWellKnownClasses) { |
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918 k = find_well_known_klass(class_name); |
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919 if (k != NULL) { |
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920 return k; |
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921 } |
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922 } |
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923 |
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924 if (FieldType::is_array(class_name)) { |
0 | 925 // The name refers to an array. Parse the name. |
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926 // dimension and object_key in FieldArrayInfo are assigned as a |
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927 // side-effect of this call |
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928 FieldArrayInfo fd; |
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929 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
0 | 930 if (t != T_OBJECT) { |
931 k = Universe::typeArrayKlassObj(t); | |
932 } else { | |
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933 k = SystemDictionary::find(fd.object_key(), class_loader, protection_domain, THREAD); |
0 | 934 } |
935 if (k != NULL) { | |
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936 k = Klass::cast(k)->array_klass_or_null(fd.dimension()); |
0 | 937 } |
938 } else { | |
939 k = find(class_name, class_loader, protection_domain, THREAD); | |
940 } | |
941 return k; | |
942 } | |
943 | |
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944 // Quick range check for names of well-known classes: |
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945 static Symbol* wk_klass_name_limits[2] = {NULL, NULL}; |
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946 |
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947 #ifndef PRODUCT |
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948 static int find_wkk_calls, find_wkk_probes, find_wkk_wins; |
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949 // counts for "hello world": 3983, 1616, 1075 |
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950 // => 60% hit after limit guard, 25% total win rate |
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951 #endif |
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952 |
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953 klassOop SystemDictionary::find_well_known_klass(Symbol* class_name) { |
132
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954 // A bounds-check on class_name will quickly get a negative result. |
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955 NOT_PRODUCT(find_wkk_calls++); |
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956 if (class_name >= wk_klass_name_limits[0] && |
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957 class_name <= wk_klass_name_limits[1]) { |
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958 NOT_PRODUCT(find_wkk_probes++); |
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959 vmSymbols::SID sid = vmSymbols::find_sid(class_name); |
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960 if (sid != vmSymbols::NO_SID) { |
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961 klassOop k = NULL; |
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962 switch (sid) { |
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963 #define WK_KLASS_CASE(name, symbol, ignore_option) \ |
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964 case vmSymbols::VM_SYMBOL_ENUM_NAME(symbol): \ |
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965 k = WK_KLASS(name); break; |
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966 WK_KLASSES_DO(WK_KLASS_CASE) |
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967 #undef WK_KLASS_CASE |
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968 } |
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969 NOT_PRODUCT(if (k != NULL) find_wkk_wins++); |
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970 return k; |
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971 } |
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972 } |
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973 return NULL; |
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974 } |
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975 |
0 | 976 // Note: this method is much like resolve_from_stream, but |
977 // updates no supplemental data structures. | |
978 // TODO consolidate the two methods with a helper routine? | |
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979 klassOop SystemDictionary::parse_stream(Symbol* class_name, |
0 | 980 Handle class_loader, |
981 Handle protection_domain, | |
982 ClassFileStream* st, | |
431
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983 KlassHandle host_klass, |
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984 GrowableArray<Handle>* cp_patches, |
0 | 985 TRAPS) { |
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986 TempNewSymbol parsed_name = NULL; |
0 | 987 |
988 // Parse the stream. Note that we do this even though this klass might | |
989 // already be present in the SystemDictionary, otherwise we would not | |
990 // throw potential ClassFormatErrors. | |
991 // | |
992 // Note: "name" is updated. | |
993 // Further note: a placeholder will be added for this class when | |
994 // super classes are loaded (resolve_super_or_fail). We expect this | |
995 // to be called for all classes but java.lang.Object; and we preload | |
996 // java.lang.Object through resolve_or_fail, not this path. | |
997 | |
998 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
999 class_loader, | |
1000 protection_domain, | |
710 | 1001 host_klass, |
1002 cp_patches, | |
0 | 1003 parsed_name, |
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1004 true, |
0 | 1005 THREAD); |
1006 | |
1007 // We don't redefine the class, so we just need to clean up whether there | |
1008 // was an error or not (don't want to modify any system dictionary | |
1009 // data structures). | |
1010 // Parsed name could be null if we threw an error before we got far | |
1011 // enough along to parse it -- in that case, there is nothing to clean up. | |
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1012 if (parsed_name != NULL) { |
0 | 1013 unsigned int p_hash = placeholders()->compute_hash(parsed_name, |
1014 class_loader); | |
1015 int p_index = placeholders()->hash_to_index(p_hash); | |
1016 { | |
1017 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1018 placeholders()->find_and_remove(p_index, p_hash, parsed_name, class_loader, THREAD); | |
1019 SystemDictionary_lock->notify_all(); | |
1020 } | |
1021 } | |
1022 | |
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1023 if (host_klass.not_null() && k.not_null()) { |
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1024 assert(EnableInvokeDynamic, ""); |
431
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1025 // If it's anonymous, initialize it now, since nobody else will. |
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1026 k->set_host_klass(host_klass()); |
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1027 |
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1028 { |
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1029 MutexLocker mu_r(Compile_lock, THREAD); |
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1030 |
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1031 // Add to class hierarchy, initialize vtables, and do possible |
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1032 // deoptimizations. |
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1033 add_to_hierarchy(k, CHECK_NULL); // No exception, but can block |
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1034 |
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1035 // But, do not add to system dictionary. |
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1036 } |
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1037 |
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1038 k->eager_initialize(THREAD); |
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1039 |
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1040 // notify jvmti |
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1041 if (JvmtiExport::should_post_class_load()) { |
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1042 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); |
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1043 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); |
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1044 } |
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1045 } |
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1046 |
0 | 1047 return k(); |
1048 } | |
1049 | |
1050 // Add a klass to the system from a stream (called by jni_DefineClass and | |
1051 // JVM_DefineClass). | |
1052 // Note: class_name can be NULL. In that case we do not know the name of | |
1053 // the class until we have parsed the stream. | |
1054 | |
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1055 klassOop SystemDictionary::resolve_from_stream(Symbol* class_name, |
0 | 1056 Handle class_loader, |
1057 Handle protection_domain, | |
1058 ClassFileStream* st, | |
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1059 bool verify, |
0 | 1060 TRAPS) { |
1061 | |
514 | 1062 // Classloaders that support parallelism, e.g. bootstrap classloader, |
1063 // or all classloaders with UnsyncloadClass do not acquire lock here | |
1064 bool DoObjectLock = true; | |
1065 if (is_parallelCapable(class_loader)) { | |
1066 DoObjectLock = false; | |
1067 } | |
1068 | |
1069 // Make sure we are synchronized on the class loader before we proceed | |
0 | 1070 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); |
1071 check_loader_lock_contention(lockObject, THREAD); | |
514 | 1072 ObjectLocker ol(lockObject, THREAD, DoObjectLock); |
0 | 1073 |
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1074 TempNewSymbol parsed_name = NULL; |
0 | 1075 |
1076 // Parse the stream. Note that we do this even though this klass might | |
1077 // already be present in the SystemDictionary, otherwise we would not | |
1078 // throw potential ClassFormatErrors. | |
1079 // | |
1080 // Note: "name" is updated. | |
1081 // Further note: a placeholder will be added for this class when | |
1082 // super classes are loaded (resolve_super_or_fail). We expect this | |
1083 // to be called for all classes but java.lang.Object; and we preload | |
1084 // java.lang.Object through resolve_or_fail, not this path. | |
1085 | |
1086 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
1087 class_loader, | |
1088 protection_domain, | |
1089 parsed_name, | |
973
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1090 verify, |
0 | 1091 THREAD); |
1092 | |
1093 const char* pkg = "java/"; | |
1094 if (!HAS_PENDING_EXCEPTION && | |
1095 !class_loader.is_null() && | |
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1096 parsed_name != NULL && |
0 | 1097 !strncmp((const char*)parsed_name->bytes(), pkg, strlen(pkg))) { |
1098 // It is illegal to define classes in the "java." package from | |
1099 // JVM_DefineClass or jni_DefineClass unless you're the bootclassloader | |
1100 ResourceMark rm(THREAD); | |
1101 char* name = parsed_name->as_C_string(); | |
1102 char* index = strrchr(name, '/'); | |
1103 *index = '\0'; // chop to just the package name | |
1104 while ((index = strchr(name, '/')) != NULL) { | |
1105 *index = '.'; // replace '/' with '.' in package name | |
1106 } | |
1107 const char* fmt = "Prohibited package name: %s"; | |
1108 size_t len = strlen(fmt) + strlen(name); | |
1109 char* message = NEW_RESOURCE_ARRAY(char, len); | |
1110 jio_snprintf(message, len, fmt, name); | |
1111 Exceptions::_throw_msg(THREAD_AND_LOCATION, | |
1112 vmSymbols::java_lang_SecurityException(), message); | |
1113 } | |
1114 | |
1115 if (!HAS_PENDING_EXCEPTION) { | |
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1116 assert(parsed_name != NULL, "Sanity"); |
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1117 assert(class_name == NULL || class_name == parsed_name, "name mismatch"); |
0 | 1118 // Verification prevents us from creating names with dots in them, this |
1119 // asserts that that's the case. | |
1120 assert(is_internal_format(parsed_name), | |
1121 "external class name format used internally"); | |
1122 | |
1123 // Add class just loaded | |
514 | 1124 // If a class loader supports parallel classloading handle parallel define requests |
1125 // find_or_define_instance_class may return a different instanceKlass | |
1126 if (is_parallelCapable(class_loader)) { | |
1127 k = find_or_define_instance_class(class_name, class_loader, k, THREAD); | |
1128 } else { | |
1129 define_instance_class(k, THREAD); | |
1130 } | |
0 | 1131 } |
1132 | |
1133 // If parsing the class file or define_instance_class failed, we | |
1134 // need to remove the placeholder added on our behalf. But we | |
1135 // must make sure parsed_name is valid first (it won't be if we had | |
1136 // a format error before the class was parsed far enough to | |
1137 // find the name). | |
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1138 if (HAS_PENDING_EXCEPTION && parsed_name != NULL) { |
0 | 1139 unsigned int p_hash = placeholders()->compute_hash(parsed_name, |
1140 class_loader); | |
1141 int p_index = placeholders()->hash_to_index(p_hash); | |
1142 { | |
1143 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1144 placeholders()->find_and_remove(p_index, p_hash, parsed_name, class_loader, THREAD); | |
1145 SystemDictionary_lock->notify_all(); | |
1146 } | |
1147 return NULL; | |
1148 } | |
1149 | |
1150 // Make sure that we didn't leave a place holder in the | |
1151 // SystemDictionary; this is only done on success | |
1152 debug_only( { | |
1153 if (!HAS_PENDING_EXCEPTION) { | |
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1154 assert(parsed_name != NULL, "parsed_name is still null?"); |
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1155 Symbol* h_name = k->name(); |
0 | 1156 Handle h_loader (THREAD, k->class_loader()); |
1157 | |
1158 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1159 | |
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1160 klassOop check = find_class(parsed_name, class_loader); |
0 | 1161 assert(check == k(), "should be present in the dictionary"); |
1162 | |
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1163 klassOop check2 = find_class(h_name, h_loader); |
0 | 1164 assert(check == check2, "name inconsistancy in SystemDictionary"); |
1165 } | |
1166 } ); | |
1167 | |
1168 return k(); | |
1169 } | |
1170 | |
1171 | |
1172 void SystemDictionary::set_shared_dictionary(HashtableBucket* t, int length, | |
1173 int number_of_entries) { | |
1174 assert(length == _nof_buckets * sizeof(HashtableBucket), | |
1175 "bad shared dictionary size."); | |
1176 _shared_dictionary = new Dictionary(_nof_buckets, t, number_of_entries); | |
1177 } | |
1178 | |
1179 | |
1180 // If there is a shared dictionary, then find the entry for the | |
1181 // given shared system class, if any. | |
1182 | |
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1183 klassOop SystemDictionary::find_shared_class(Symbol* class_name) { |
0 | 1184 if (shared_dictionary() != NULL) { |
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1185 unsigned int d_hash = shared_dictionary()->compute_hash(class_name, Handle()); |
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1186 int d_index = shared_dictionary()->hash_to_index(d_hash); |
0 | 1187 return shared_dictionary()->find_shared_class(d_index, d_hash, class_name); |
1188 } else { | |
1189 return NULL; | |
1190 } | |
1191 } | |
1192 | |
1193 | |
1194 // Load a class from the shared spaces (found through the shared system | |
1195 // dictionary). Force the superclass and all interfaces to be loaded. | |
1196 // Update the class definition to include sibling classes and no | |
1197 // subclasses (yet). [Classes in the shared space are not part of the | |
1198 // object hierarchy until loaded.] | |
1199 | |
1200 instanceKlassHandle SystemDictionary::load_shared_class( | |
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1201 Symbol* class_name, Handle class_loader, TRAPS) { |
0 | 1202 instanceKlassHandle ik (THREAD, find_shared_class(class_name)); |
1203 return load_shared_class(ik, class_loader, THREAD); | |
1204 } | |
1205 | |
1206 // Note well! Changes to this method may affect oop access order | |
1207 // in the shared archive. Please take care to not make changes that | |
1208 // adversely affect cold start time by changing the oop access order | |
1209 // that is specified in dump.cpp MarkAndMoveOrderedReadOnly and | |
1210 // MarkAndMoveOrderedReadWrite closures. | |
1211 instanceKlassHandle SystemDictionary::load_shared_class( | |
1212 instanceKlassHandle ik, Handle class_loader, TRAPS) { | |
1213 assert(class_loader.is_null(), "non-null classloader for shared class?"); | |
1214 if (ik.not_null()) { | |
1215 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1216 Symbol* class_name = ik->name(); |
0 | 1217 |
1218 // Found the class, now load the superclass and interfaces. If they | |
1219 // are shared, add them to the main system dictionary and reset | |
1220 // their hierarchy references (supers, subs, and interfaces). | |
1221 | |
1222 if (ik->super() != NULL) { | |
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1223 Symbol* cn = ik->super()->klass_part()->name(); |
0 | 1224 resolve_super_or_fail(class_name, cn, |
1225 class_loader, Handle(), true, CHECK_(nh)); | |
1226 } | |
1227 | |
1228 objArrayHandle interfaces (THREAD, ik->local_interfaces()); | |
1229 int num_interfaces = interfaces->length(); | |
1230 for (int index = 0; index < num_interfaces; index++) { | |
1231 klassOop k = klassOop(interfaces->obj_at(index)); | |
1232 | |
1233 // Note: can not use instanceKlass::cast here because | |
1234 // interfaces' instanceKlass's C++ vtbls haven't been | |
1235 // reinitialized yet (they will be once the interface classes | |
1236 // are loaded) | |
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1237 Symbol* name = k->klass_part()->name(); |
0 | 1238 resolve_super_or_fail(class_name, name, class_loader, Handle(), false, CHECK_(nh)); |
1239 } | |
1240 | |
1241 // Adjust methods to recover missing data. They need addresses for | |
1242 // interpreter entry points and their default native method address | |
1243 // must be reset. | |
1244 | |
1245 // Updating methods must be done under a lock so multiple | |
1246 // threads don't update these in parallel | |
1247 // Shared classes are all currently loaded by the bootstrap | |
1248 // classloader, so this will never cause a deadlock on | |
1249 // a custom class loader lock. | |
1250 | |
1251 { | |
1252 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
1253 check_loader_lock_contention(lockObject, THREAD); | |
1254 ObjectLocker ol(lockObject, THREAD, true); | |
1255 | |
1256 objArrayHandle methods (THREAD, ik->methods()); | |
1257 int num_methods = methods->length(); | |
1258 for (int index2 = 0; index2 < num_methods; ++index2) { | |
1259 methodHandle m(THREAD, methodOop(methods->obj_at(index2))); | |
1260 m()->link_method(m, CHECK_(nh)); | |
1261 } | |
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1262 if (JvmtiExport::has_redefined_a_class()) { |
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1263 // Reinitialize vtable because RedefineClasses may have changed some |
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1264 // entries in this vtable for super classes so the CDS vtable might |
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1265 // point to old or obsolete entries. RedefineClasses doesn't fix up |
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1266 // vtables in the shared system dictionary, only the main one. |
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1267 // It also redefines the itable too so fix that too. |
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1268 ResourceMark rm(THREAD); |
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1269 ik->vtable()->initialize_vtable(false, CHECK_(nh)); |
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1270 ik->itable()->initialize_itable(false, CHECK_(nh)); |
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1271 } |
0 | 1272 } |
1273 | |
1274 if (TraceClassLoading) { | |
1275 ResourceMark rm; | |
1276 tty->print("[Loaded %s", ik->external_name()); | |
1277 tty->print(" from shared objects file"); | |
1278 tty->print_cr("]"); | |
1279 } | |
1280 // notify a class loaded from shared object | |
1281 ClassLoadingService::notify_class_loaded(instanceKlass::cast(ik()), | |
1282 true /* shared class */); | |
1283 } | |
1284 return ik; | |
1285 } | |
1286 | |
1287 #ifdef KERNEL | |
1288 // Some classes on the bootstrap class path haven't been installed on the | |
1289 // system yet. Call the DownloadManager method to make them appear in the | |
1290 // bootstrap class path and try again to load the named class. | |
1291 // Note that with delegation class loaders all classes in another loader will | |
1292 // first try to call this so it'd better be fast!! | |
1293 static instanceKlassHandle download_and_retry_class_load( | |
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1294 Symbol* class_name, |
0 | 1295 TRAPS) { |
1296 | |
3938 | 1297 klassOop dlm = SystemDictionary::DownloadManager_klass(); |
0 | 1298 instanceKlassHandle nk; |
1299 | |
1300 // If download manager class isn't loaded just return. | |
1301 if (dlm == NULL) return nk; | |
1302 | |
1303 { HandleMark hm(THREAD); | |
1304 ResourceMark rm(THREAD); | |
1305 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nk)); | |
1306 Handle class_string = java_lang_String::externalize_classname(s, CHECK_(nk)); | |
1307 | |
1308 // return value | |
1309 JavaValue result(T_OBJECT); | |
1310 | |
1311 // Call the DownloadManager. We assume that it has a lock because | |
1312 // multiple classes could be not found and downloaded at the same time. | |
1313 // class sun.misc.DownloadManager; | |
1314 // public static String getBootClassPathEntryForClass(String className); | |
1315 JavaCalls::call_static(&result, | |
1316 KlassHandle(THREAD, dlm), | |
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1317 vmSymbols::getBootClassPathEntryForClass_name(), |
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1318 vmSymbols::string_string_signature(), |
0 | 1319 class_string, |
1320 CHECK_(nk)); | |
1321 | |
1322 // Get result.string and add to bootclasspath | |
1323 assert(result.get_type() == T_OBJECT, "just checking"); | |
1324 oop obj = (oop) result.get_jobject(); | |
1325 if (obj == NULL) { return nk; } | |
1326 | |
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1327 Handle h_obj(THREAD, obj); |
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1328 char* new_class_name = java_lang_String::as_platform_dependent_str(h_obj, |
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1329 CHECK_(nk)); |
0 | 1330 |
1331 // lock the loader | |
1332 // we use this lock because JVMTI does. | |
1333 Handle loader_lock(THREAD, SystemDictionary::system_loader_lock()); | |
1334 | |
1335 ObjectLocker ol(loader_lock, THREAD); | |
1336 // add the file to the bootclasspath | |
1337 ClassLoader::update_class_path_entry_list(new_class_name, true); | |
1338 } // end HandleMark | |
1339 | |
1340 if (TraceClassLoading) { | |
1341 ClassLoader::print_bootclasspath(); | |
1342 } | |
1343 return ClassLoader::load_classfile(class_name, CHECK_(nk)); | |
1344 } | |
1345 #endif // KERNEL | |
1346 | |
1347 | |
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1348 instanceKlassHandle SystemDictionary::load_instance_class(Symbol* class_name, Handle class_loader, TRAPS) { |
0 | 1349 instanceKlassHandle nh = instanceKlassHandle(); // null Handle |
1350 if (class_loader.is_null()) { | |
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1351 |
0 | 1352 // Search the shared system dictionary for classes preloaded into the |
1353 // shared spaces. | |
1354 instanceKlassHandle k; | |
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1355 { |
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1356 PerfTraceTime vmtimer(ClassLoader::perf_shared_classload_time()); |
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1357 k = load_shared_class(class_name, class_loader, THREAD); |
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1358 } |
0 | 1359 |
1360 if (k.is_null()) { | |
1361 // Use VM class loader | |
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1362 PerfTraceTime vmtimer(ClassLoader::perf_sys_classload_time()); |
0 | 1363 k = ClassLoader::load_classfile(class_name, CHECK_(nh)); |
1364 } | |
1365 | |
1366 #ifdef KERNEL | |
1367 // If the VM class loader has failed to load the class, call the | |
1368 // DownloadManager class to make it magically appear on the classpath | |
1369 // and try again. This is only configured with the Kernel VM. | |
1370 if (k.is_null()) { | |
1371 k = download_and_retry_class_load(class_name, CHECK_(nh)); | |
1372 } | |
1373 #endif // KERNEL | |
1374 | |
514 | 1375 // find_or_define_instance_class may return a different instanceKlass |
0 | 1376 if (!k.is_null()) { |
1377 k = find_or_define_instance_class(class_name, class_loader, k, CHECK_(nh)); | |
1378 } | |
1379 return k; | |
1380 } else { | |
1381 // Use user specified class loader to load class. Call loadClass operation on class_loader. | |
1382 ResourceMark rm(THREAD); | |
1383 | |
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1384 assert(THREAD->is_Java_thread(), "must be a JavaThread"); |
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1385 JavaThread* jt = (JavaThread*) THREAD; |
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1386 |
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1387 PerfClassTraceTime vmtimer(ClassLoader::perf_app_classload_time(), |
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1388 ClassLoader::perf_app_classload_selftime(), |
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1389 ClassLoader::perf_app_classload_count(), |
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1390 jt->get_thread_stat()->perf_recursion_counts_addr(), |
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1391 jt->get_thread_stat()->perf_timers_addr(), |
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1392 PerfClassTraceTime::CLASS_LOAD); |
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1393 |
0 | 1394 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nh)); |
1395 // Translate to external class name format, i.e., convert '/' chars to '.' | |
1396 Handle string = java_lang_String::externalize_classname(s, CHECK_(nh)); | |
1397 | |
1398 JavaValue result(T_OBJECT); | |
1399 | |
1142 | 1400 KlassHandle spec_klass (THREAD, SystemDictionary::ClassLoader_klass()); |
0 | 1401 |
514 | 1402 // Call public unsynchronized loadClass(String) directly for all class loaders |
1403 // for parallelCapable class loaders. JDK >=7, loadClass(String, boolean) will | |
1404 // acquire a class-name based lock rather than the class loader object lock. | |
1405 // JDK < 7 already acquire the class loader lock in loadClass(String, boolean), | |
1406 // so the call to loadClassInternal() was not required. | |
1407 // | |
1408 // UnsyncloadClass flag means both call loadClass(String) and do | |
1409 // not acquire the class loader lock even for class loaders that are | |
1410 // not parallelCapable. This was a risky transitional | |
1411 // flag for diagnostic purposes only. It is risky to call | |
0 | 1412 // custom class loaders without synchronization. |
1413 // WARNING If a custom class loader does NOT synchronizer findClass, or callers of | |
514 | 1414 // findClass, the UnsyncloadClass flag risks unexpected timing bugs in the field. |
0 | 1415 // Do NOT assume this will be supported in future releases. |
514 | 1416 // |
1417 // Added MustCallLoadClassInternal in case we discover in the field | |
1418 // a customer that counts on this call | |
1419 if (MustCallLoadClassInternal && has_loadClassInternal()) { | |
0 | 1420 JavaCalls::call_special(&result, |
1421 class_loader, | |
1422 spec_klass, | |
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1423 vmSymbols::loadClassInternal_name(), |
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1424 vmSymbols::string_class_signature(), |
0 | 1425 string, |
1426 CHECK_(nh)); | |
1427 } else { | |
1428 JavaCalls::call_virtual(&result, | |
1429 class_loader, | |
1430 spec_klass, | |
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1431 vmSymbols::loadClass_name(), |
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1432 vmSymbols::string_class_signature(), |
0 | 1433 string, |
1434 CHECK_(nh)); | |
1435 } | |
1436 | |
1437 assert(result.get_type() == T_OBJECT, "just checking"); | |
1438 oop obj = (oop) result.get_jobject(); | |
1439 | |
1440 // Primitive classes return null since forName() can not be | |
1441 // used to obtain any of the Class objects representing primitives or void | |
1442 if ((obj != NULL) && !(java_lang_Class::is_primitive(obj))) { | |
1443 instanceKlassHandle k = | |
1444 instanceKlassHandle(THREAD, java_lang_Class::as_klassOop(obj)); | |
1445 // For user defined Java class loaders, check that the name returned is | |
1446 // the same as that requested. This check is done for the bootstrap | |
1447 // loader when parsing the class file. | |
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1448 if (class_name == k->name()) { |
0 | 1449 return k; |
1450 } | |
1451 } | |
1452 // Class is not found or has the wrong name, return NULL | |
1453 return nh; | |
1454 } | |
1455 } | |
1456 | |
1457 void SystemDictionary::define_instance_class(instanceKlassHandle k, TRAPS) { | |
1458 | |
1459 Handle class_loader_h(THREAD, k->class_loader()); | |
1460 | |
514 | 1461 // for bootstrap and other parallel classloaders don't acquire lock, |
1462 // use placeholder token | |
1463 // If a parallelCapable class loader calls define_instance_class instead of | |
1464 // find_or_define_instance_class to get here, we have a timing | |
1465 // hole with systemDictionary updates and check_constraints | |
1466 if (!class_loader_h.is_null() && !is_parallelCapable(class_loader_h)) { | |
0 | 1467 assert(ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, |
1468 compute_loader_lock_object(class_loader_h, THREAD)), | |
1469 "define called without lock"); | |
1470 } | |
1471 | |
1472 // Check class-loading constraints. Throw exception if violation is detected. | |
1473 // Grabs and releases SystemDictionary_lock | |
1474 // The check_constraints/find_class call and update_dictionary sequence | |
1475 // must be "atomic" for a specific class/classloader pair so we never | |
1476 // define two different instanceKlasses for that class/classloader pair. | |
1477 // Existing classloaders will call define_instance_class with the | |
1478 // classloader lock held | |
1479 // Parallel classloaders will call find_or_define_instance_class | |
1480 // which will require a token to perform the define class | |
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1481 Symbol* name_h = k->name(); |
0 | 1482 unsigned int d_hash = dictionary()->compute_hash(name_h, class_loader_h); |
1483 int d_index = dictionary()->hash_to_index(d_hash); | |
1484 check_constraints(d_index, d_hash, k, class_loader_h, true, CHECK); | |
1485 | |
1486 // Register class just loaded with class loader (placed in Vector) | |
1487 // Note we do this before updating the dictionary, as this can | |
1488 // fail with an OutOfMemoryError (if it does, we will *not* put this | |
1489 // class in the dictionary and will not update the class hierarchy). | |
1490 if (k->class_loader() != NULL) { | |
1491 methodHandle m(THREAD, Universe::loader_addClass_method()); | |
1492 JavaValue result(T_VOID); | |
1493 JavaCallArguments args(class_loader_h); | |
1494 args.push_oop(Handle(THREAD, k->java_mirror())); | |
1495 JavaCalls::call(&result, m, &args, CHECK); | |
1496 } | |
1497 | |
1498 // Add the new class. We need recompile lock during update of CHA. | |
1499 { | |
1500 unsigned int p_hash = placeholders()->compute_hash(name_h, class_loader_h); | |
1501 int p_index = placeholders()->hash_to_index(p_hash); | |
1502 | |
1503 MutexLocker mu_r(Compile_lock, THREAD); | |
1504 | |
1505 // Add to class hierarchy, initialize vtables, and do possible | |
1506 // deoptimizations. | |
1507 add_to_hierarchy(k, CHECK); // No exception, but can block | |
1508 | |
1509 // Add to systemDictionary - so other classes can see it. | |
1510 // Grabs and releases SystemDictionary_lock | |
1511 update_dictionary(d_index, d_hash, p_index, p_hash, | |
1512 k, class_loader_h, THREAD); | |
1513 } | |
1514 k->eager_initialize(THREAD); | |
1515 | |
1516 // notify jvmti | |
1517 if (JvmtiExport::should_post_class_load()) { | |
1518 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); | |
1519 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); | |
1520 | |
1521 } | |
1522 } | |
1523 | |
1524 // Support parallel classloading | |
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1525 // All parallel class loaders, including bootstrap classloader |
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1526 // lock a placeholder entry for this class/class_loader pair |
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1527 // to allow parallel defines of different classes for this class loader |
514 | 1528 // With AllowParallelDefine flag==true, in case they do not synchronize around |
1529 // FindLoadedClass/DefineClass, calls, we check for parallel | |
0 | 1530 // loading for them, wait if a defineClass is in progress |
1531 // and return the initial requestor's results | |
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1532 // This flag does not apply to the bootstrap classloader. |
514 | 1533 // With AllowParallelDefine flag==false, call through to define_instance_class |
1534 // which will throw LinkageError: duplicate class definition. | |
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1535 // False is the requested default. |
0 | 1536 // For better performance, the class loaders should synchronize |
514 | 1537 // findClass(), i.e. FindLoadedClass/DefineClassIfAbsent or they |
0 | 1538 // potentially waste time reading and parsing the bytestream. |
1539 // Note: VM callers should ensure consistency of k/class_name,class_loader | |
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1540 instanceKlassHandle SystemDictionary::find_or_define_instance_class(Symbol* class_name, Handle class_loader, instanceKlassHandle k, TRAPS) { |
0 | 1541 |
1542 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1543 Symbol* name_h = k->name(); // passed in class_name may be null |
0 | 1544 |
515 | 1545 unsigned int d_hash = dictionary()->compute_hash(name_h, class_loader); |
0 | 1546 int d_index = dictionary()->hash_to_index(d_hash); |
1547 | |
1548 // Hold SD lock around find_class and placeholder creation for DEFINE_CLASS | |
515 | 1549 unsigned int p_hash = placeholders()->compute_hash(name_h, class_loader); |
0 | 1550 int p_index = placeholders()->hash_to_index(p_hash); |
1551 PlaceholderEntry* probe; | |
1552 | |
1553 { | |
1554 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1555 // First check if class already defined | |
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1556 if (UnsyncloadClass || (is_parallelDefine(class_loader))) { |
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1557 klassOop check = find_class(d_index, d_hash, name_h, class_loader); |
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1558 if (check != NULL) { |
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1559 return(instanceKlassHandle(THREAD, check)); |
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1560 } |
0 | 1561 } |
1562 | |
1563 // Acquire define token for this class/classloader | |
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1564 probe = placeholders()->find_and_add(p_index, p_hash, name_h, class_loader, PlaceholderTable::DEFINE_CLASS, NULL, THREAD); |
514 | 1565 // Wait if another thread defining in parallel |
1566 // All threads wait - even those that will throw duplicate class: otherwise | |
1567 // caller is surprised by LinkageError: duplicate, but findLoadedClass fails | |
1568 // if other thread has not finished updating dictionary | |
1569 while (probe->definer() != NULL) { | |
1570 SystemDictionary_lock->wait(); | |
1571 } | |
1572 // Only special cases allow parallel defines and can use other thread's results | |
1573 // Other cases fall through, and may run into duplicate defines | |
1574 // caught by finding an entry in the SystemDictionary | |
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1575 if ((UnsyncloadClass || is_parallelDefine(class_loader)) && (probe->instanceKlass() != NULL)) { |
0 | 1576 probe->remove_seen_thread(THREAD, PlaceholderTable::DEFINE_CLASS); |
515 | 1577 placeholders()->find_and_remove(p_index, p_hash, name_h, class_loader, THREAD); |
514 | 1578 SystemDictionary_lock->notify_all(); |
0 | 1579 #ifdef ASSERT |
515 | 1580 klassOop check = find_class(d_index, d_hash, name_h, class_loader); |
514 | 1581 assert(check != NULL, "definer missed recording success"); |
0 | 1582 #endif |
514 | 1583 return(instanceKlassHandle(THREAD, probe->instanceKlass())); |
0 | 1584 } else { |
514 | 1585 // This thread will define the class (even if earlier thread tried and had an error) |
1586 probe->set_definer(THREAD); | |
0 | 1587 } |
1588 } | |
1589 | |
1590 define_instance_class(k, THREAD); | |
1591 | |
1592 Handle linkage_exception = Handle(); // null handle | |
1593 | |
1594 // definer must notify any waiting threads | |
1595 { | |
1596 MutexLocker mu(SystemDictionary_lock, THREAD); | |
515 | 1597 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name_h, class_loader); |
0 | 1598 assert(probe != NULL, "DEFINE_CLASS placeholder lost?"); |
1599 if (probe != NULL) { | |
1600 if (HAS_PENDING_EXCEPTION) { | |
1601 linkage_exception = Handle(THREAD,PENDING_EXCEPTION); | |
1602 CLEAR_PENDING_EXCEPTION; | |
1603 } else { | |
1604 probe->set_instanceKlass(k()); | |
1605 } | |
1606 probe->set_definer(NULL); | |
1607 probe->remove_seen_thread(THREAD, PlaceholderTable::DEFINE_CLASS); | |
515 | 1608 placeholders()->find_and_remove(p_index, p_hash, name_h, class_loader, THREAD); |
0 | 1609 SystemDictionary_lock->notify_all(); |
1610 } | |
1611 } | |
1612 | |
1613 // Can't throw exception while holding lock due to rank ordering | |
1614 if (linkage_exception() != NULL) { | |
1615 THROW_OOP_(linkage_exception(), nh); // throws exception and returns | |
1616 } | |
1617 | |
1618 return k; | |
1619 } | |
1620 Handle SystemDictionary::compute_loader_lock_object(Handle class_loader, TRAPS) { | |
1621 // If class_loader is NULL we synchronize on _system_loader_lock_obj | |
1622 if (class_loader.is_null()) { | |
1623 return Handle(THREAD, _system_loader_lock_obj); | |
1624 } else { | |
1625 return class_loader; | |
1626 } | |
1627 } | |
1628 | |
1629 // This method is added to check how often we have to wait to grab loader | |
1630 // lock. The results are being recorded in the performance counters defined in | |
1631 // ClassLoader::_sync_systemLoaderLockContentionRate and | |
1632 // ClassLoader::_sync_nonSystemLoaderLockConteionRate. | |
1633 void SystemDictionary::check_loader_lock_contention(Handle loader_lock, TRAPS) { | |
1634 if (!UsePerfData) { | |
1635 return; | |
1636 } | |
1637 | |
1638 assert(!loader_lock.is_null(), "NULL lock object"); | |
1639 | |
1640 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader_lock) | |
1641 == ObjectSynchronizer::owner_other) { | |
1642 // contention will likely happen, so increment the corresponding | |
1643 // contention counter. | |
1644 if (loader_lock() == _system_loader_lock_obj) { | |
1645 ClassLoader::sync_systemLoaderLockContentionRate()->inc(); | |
1646 } else { | |
1647 ClassLoader::sync_nonSystemLoaderLockContentionRate()->inc(); | |
1648 } | |
1649 } | |
1650 } | |
1651 | |
1652 // ---------------------------------------------------------------------------- | |
1653 // Lookup | |
1654 | |
1655 klassOop SystemDictionary::find_class(int index, unsigned int hash, | |
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1656 Symbol* class_name, |
0 | 1657 Handle class_loader) { |
1658 assert_locked_or_safepoint(SystemDictionary_lock); | |
1659 assert (index == dictionary()->index_for(class_name, class_loader), | |
1660 "incorrect index?"); | |
1661 | |
1662 klassOop k = dictionary()->find_class(index, hash, class_name, class_loader); | |
1663 return k; | |
1664 } | |
1665 | |
1666 | |
1667 // Basic find on classes in the midst of being loaded | |
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1668 Symbol* SystemDictionary::find_placeholder(Symbol* class_name, |
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1669 Handle class_loader) { |
0 | 1670 assert_locked_or_safepoint(SystemDictionary_lock); |
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1671 unsigned int p_hash = placeholders()->compute_hash(class_name, class_loader); |
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1672 int p_index = placeholders()->hash_to_index(p_hash); |
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1673 return placeholders()->find_entry(p_index, p_hash, class_name, class_loader); |
0 | 1674 } |
1675 | |
1676 | |
1677 // Used for assertions and verification only | |
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1678 klassOop SystemDictionary::find_class(Symbol* class_name, Handle class_loader) { |
0 | 1679 #ifndef ASSERT |
1680 guarantee(VerifyBeforeGC || | |
1681 VerifyDuringGC || | |
1682 VerifyBeforeExit || | |
1683 VerifyAfterGC, "too expensive"); | |
1684 #endif | |
1685 assert_locked_or_safepoint(SystemDictionary_lock); | |
1686 | |
1687 // First look in the loaded class array | |
1688 unsigned int d_hash = dictionary()->compute_hash(class_name, class_loader); | |
1689 int d_index = dictionary()->hash_to_index(d_hash); | |
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1690 return find_class(d_index, d_hash, class_name, class_loader); |
0 | 1691 } |
1692 | |
1693 | |
1694 // Get the next class in the diictionary. | |
1695 klassOop SystemDictionary::try_get_next_class() { | |
1696 return dictionary()->try_get_next_class(); | |
1697 } | |
1698 | |
1699 | |
1700 // ---------------------------------------------------------------------------- | |
1701 // Update hierachy. This is done before the new klass has been added to the SystemDictionary. The Recompile_lock | |
1702 // is held, to ensure that the compiler is not using the class hierachy, and that deoptimization will kick in | |
1703 // before a new class is used. | |
1704 | |
1705 void SystemDictionary::add_to_hierarchy(instanceKlassHandle k, TRAPS) { | |
1706 assert(k.not_null(), "just checking"); | |
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1707 assert_locked_or_safepoint(Compile_lock); |
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1708 |
0 | 1709 // Link into hierachy. Make sure the vtables are initialized before linking into |
1710 k->append_to_sibling_list(); // add to superklass/sibling list | |
1711 k->process_interfaces(THREAD); // handle all "implements" declarations | |
1712 k->set_init_state(instanceKlass::loaded); | |
1713 // Now flush all code that depended on old class hierarchy. | |
1714 // Note: must be done *after* linking k into the hierarchy (was bug 12/9/97) | |
1715 // Also, first reinitialize vtable because it may have gotten out of synch | |
1716 // while the new class wasn't connected to the class hierarchy. | |
1717 Universe::flush_dependents_on(k); | |
1718 } | |
1719 | |
1720 | |
1721 // ---------------------------------------------------------------------------- | |
1722 // GC support | |
1723 | |
1724 // Following roots during mark-sweep is separated in two phases. | |
1725 // | |
1726 // The first phase follows preloaded classes and all other system | |
1727 // classes, since these will never get unloaded anyway. | |
1728 // | |
1729 // The second phase removes (unloads) unreachable classes from the | |
1730 // system dictionary and follows the remaining classes' contents. | |
1731 | |
1732 void SystemDictionary::always_strong_oops_do(OopClosure* blk) { | |
1733 // Follow preloaded classes/mirrors and system loader object | |
1734 blk->do_oop(&_java_system_loader); | |
1735 preloaded_oops_do(blk); | |
1736 always_strong_classes_do(blk); | |
1737 } | |
1738 | |
1739 | |
1740 void SystemDictionary::always_strong_classes_do(OopClosure* blk) { | |
1741 // Follow all system classes and temporary placeholders in dictionary | |
1742 dictionary()->always_strong_classes_do(blk); | |
1743 | |
1744 // Placeholders. These are *always* strong roots, as they | |
1745 // represent classes we're actively loading. | |
1746 placeholders_do(blk); | |
1747 | |
710 | 1748 // Visit extra methods |
1903 | 1749 invoke_method_table()->oops_do(blk); |
0 | 1750 } |
1751 | |
1752 | |
1753 void SystemDictionary::placeholders_do(OopClosure* blk) { | |
1754 placeholders()->oops_do(blk); | |
1755 } | |
1756 | |
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1757 // Calculate a "good" systemdictionary size based |
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1758 // on predicted or current loaded classes count |
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1759 int SystemDictionary::calculate_systemdictionary_size(int classcount) { |
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1760 int newsize = _old_default_sdsize; |
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1761 if ((classcount > 0) && !DumpSharedSpaces) { |
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1762 int desiredsize = classcount/_average_depth_goal; |
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1763 for (newsize = _primelist[_sdgeneration]; _sdgeneration < _prime_array_size -1; |
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1764 newsize = _primelist[++_sdgeneration]) { |
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1765 if (desiredsize <= newsize) { |
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1766 break; |
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|
1767 } |
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1768 } |
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1769 } |
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1770 return newsize; |
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1771 } |
0 | 1772 bool SystemDictionary::do_unloading(BoolObjectClosure* is_alive) { |
1773 bool result = dictionary()->do_unloading(is_alive); | |
1774 constraints()->purge_loader_constraints(is_alive); | |
1775 resolution_errors()->purge_resolution_errors(is_alive); | |
1776 return result; | |
1777 } | |
1778 | |
1779 | |
1780 // The mirrors are scanned by shared_oops_do() which is | |
1781 // not called by oops_do(). In order to process oops in | |
1782 // a necessary order, shared_oops_do() is call by | |
1783 // Universe::oops_do(). | |
1784 void SystemDictionary::oops_do(OopClosure* f) { | |
1785 // Adjust preloaded classes and system loader object | |
1786 f->do_oop(&_java_system_loader); | |
1787 preloaded_oops_do(f); | |
1788 | |
1789 lazily_loaded_oops_do(f); | |
1790 | |
1791 // Adjust dictionary | |
1792 dictionary()->oops_do(f); | |
1793 | |
710 | 1794 // Visit extra methods |
1903 | 1795 invoke_method_table()->oops_do(f); |
710 | 1796 |
0 | 1797 // Partially loaded classes |
1798 placeholders()->oops_do(f); | |
1799 | |
1800 // Adjust constraint table | |
1801 constraints()->oops_do(f); | |
1802 | |
1803 // Adjust resolution error table | |
1804 resolution_errors()->oops_do(f); | |
1805 } | |
1806 | |
1807 | |
1808 void SystemDictionary::preloaded_oops_do(OopClosure* f) { | |
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1809 for (int k = (int)FIRST_WKID; k < (int)WKID_LIMIT; k++) { |
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1810 f->do_oop((oop*) &_well_known_klasses[k]); |
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1811 } |
0 | 1812 |
1813 { | |
1814 for (int i = 0; i < T_VOID+1; i++) { | |
1815 if (_box_klasses[i] != NULL) { | |
1816 assert(i >= T_BOOLEAN, "checking"); | |
1817 f->do_oop((oop*) &_box_klasses[i]); | |
1818 } | |
1819 } | |
1820 } | |
1821 | |
1822 // The basic type mirrors would have already been processed in | |
1823 // Universe::oops_do(), via a call to shared_oops_do(), so should | |
1824 // not be processed again. | |
1825 | |
1826 f->do_oop((oop*) &_system_loader_lock_obj); | |
1827 FilteredFieldsMap::klasses_oops_do(f); | |
1828 } | |
1829 | |
1830 void SystemDictionary::lazily_loaded_oops_do(OopClosure* f) { | |
1831 f->do_oop((oop*) &_abstract_ownable_synchronizer_klass); | |
1832 } | |
1833 | |
1834 // Just the classes from defining class loaders | |
1835 // Don't iterate over placeholders | |
1836 void SystemDictionary::classes_do(void f(klassOop)) { | |
1837 dictionary()->classes_do(f); | |
1838 } | |
1839 | |
1840 // Added for initialize_itable_for_klass | |
1841 // Just the classes from defining class loaders | |
1842 // Don't iterate over placeholders | |
1843 void SystemDictionary::classes_do(void f(klassOop, TRAPS), TRAPS) { | |
1844 dictionary()->classes_do(f, CHECK); | |
1845 } | |
1846 | |
1847 // All classes, and their class loaders | |
1848 // Don't iterate over placeholders | |
1849 void SystemDictionary::classes_do(void f(klassOop, oop)) { | |
1850 dictionary()->classes_do(f); | |
1851 } | |
1852 | |
1853 // All classes, and their class loaders | |
1854 // (added for helpers that use HandleMarks and ResourceMarks) | |
1855 // Don't iterate over placeholders | |
1856 void SystemDictionary::classes_do(void f(klassOop, oop, TRAPS), TRAPS) { | |
1857 dictionary()->classes_do(f, CHECK); | |
1858 } | |
1859 | |
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1860 void SystemDictionary::placeholders_do(void f(Symbol*, oop)) { |
0 | 1861 placeholders()->entries_do(f); |
1862 } | |
1863 | |
1864 void SystemDictionary::methods_do(void f(methodOop)) { | |
1865 dictionary()->methods_do(f); | |
1903 | 1866 invoke_method_table()->methods_do(f); |
0 | 1867 } |
1868 | |
1869 // ---------------------------------------------------------------------------- | |
1870 // Lazily load klasses | |
1871 | |
1872 void SystemDictionary::load_abstract_ownable_synchronizer_klass(TRAPS) { | |
1873 assert(JDK_Version::is_gte_jdk16x_version(), "Must be JDK 1.6 or later"); | |
1874 | |
1875 // if multiple threads calling this function, only one thread will load | |
1876 // the class. The other threads will find the loaded version once the | |
1877 // class is loaded. | |
1878 klassOop aos = _abstract_ownable_synchronizer_klass; | |
1879 if (aos == NULL) { | |
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1880 klassOop k = resolve_or_fail(vmSymbols::java_util_concurrent_locks_AbstractOwnableSynchronizer(), true, CHECK); |
0 | 1881 // Force a fence to prevent any read before the write completes |
1882 OrderAccess::fence(); | |
1883 _abstract_ownable_synchronizer_klass = k; | |
1884 } | |
1885 } | |
1886 | |
1887 // ---------------------------------------------------------------------------- | |
1888 // Initialization | |
1889 | |
1890 void SystemDictionary::initialize(TRAPS) { | |
1891 // Allocate arrays | |
1892 assert(dictionary() == NULL, | |
1893 "SystemDictionary should only be initialized once"); | |
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1894 _sdgeneration = 0; |
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1895 _dictionary = new Dictionary(calculate_systemdictionary_size(PredictedLoadedClassCount)); |
1903 | 1896 _placeholders = new PlaceholderTable(_nof_buckets); |
0 | 1897 _number_of_modifications = 0; |
1903 | 1898 _loader_constraints = new LoaderConstraintTable(_loader_constraint_size); |
1899 _resolution_errors = new ResolutionErrorTable(_resolution_error_size); | |
1900 _invoke_method_table = new SymbolPropertyTable(_invoke_method_size); | |
0 | 1901 |
1902 // Allocate private object used as system class loader lock | |
1903 _system_loader_lock_obj = oopFactory::new_system_objArray(0, CHECK); | |
1904 // Initialize basic classes | |
1905 initialize_preloaded_classes(CHECK); | |
1906 } | |
1907 | |
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1908 // Compact table of directions on the initialization of klasses: |
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1909 static const short wk_init_info[] = { |
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1910 #define WK_KLASS_INIT_INFO(name, symbol, option) \ |
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1911 ( ((int)vmSymbols::VM_SYMBOL_ENUM_NAME(symbol) \ |
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1912 << SystemDictionary::CEIL_LG_OPTION_LIMIT) \ |
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1913 | (int)SystemDictionary::option ), |
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1914 WK_KLASSES_DO(WK_KLASS_INIT_INFO) |
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1915 #undef WK_KLASS_INIT_INFO |
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1916 0 |
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1917 }; |
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1918 |
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1919 bool SystemDictionary::initialize_wk_klass(WKID id, int init_opt, TRAPS) { |
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1920 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1921 int info = wk_init_info[id - FIRST_WKID]; |
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1922 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1923 Symbol* symbol = vmSymbols::symbol_at((vmSymbols::SID)sid); |
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1924 klassOop* klassp = &_well_known_klasses[id]; |
2460 | 1925 bool must_load = (init_opt < SystemDictionary::Opt); |
1926 bool try_load = true; | |
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1927 if (init_opt == SystemDictionary::Opt_Kernel) { |
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1928 #ifndef KERNEL |
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1929 try_load = false; |
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1930 #endif //KERNEL |
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1931 } |
2460 | 1932 if ((*klassp) == NULL && try_load) { |
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1933 if (must_load) { |
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1934 (*klassp) = resolve_or_fail(symbol, true, CHECK_0); // load required class |
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1935 } else { |
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1936 (*klassp) = resolve_or_null(symbol, CHECK_0); // load optional klass |
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1937 } |
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1938 } |
2460 | 1939 return ((*klassp) != NULL); |
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1940 } |
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1941 |
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1942 void SystemDictionary::initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS) { |
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1943 assert((int)start_id <= (int)limit_id, "IDs are out of order!"); |
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1944 for (int id = (int)start_id; id < (int)limit_id; id++) { |
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1945 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1946 int info = wk_init_info[id - FIRST_WKID]; |
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1947 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1948 int opt = (info & right_n_bits(CEIL_LG_OPTION_LIMIT)); |
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1949 |
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1950 initialize_wk_klass((WKID)id, opt, CHECK); |
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1951 |
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1952 // Update limits, so find_well_known_klass can be very fast: |
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1953 Symbol* s = vmSymbols::symbol_at((vmSymbols::SID)sid); |
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1954 if (wk_klass_name_limits[1] == NULL) { |
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1955 wk_klass_name_limits[0] = wk_klass_name_limits[1] = s; |
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1956 } else if (wk_klass_name_limits[1] < s) { |
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1957 wk_klass_name_limits[1] = s; |
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1958 } else if (wk_klass_name_limits[0] > s) { |
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1959 wk_klass_name_limits[0] = s; |
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1960 } |
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1961 } |
710 | 1962 |
1963 // move the starting value forward to the limit: | |
1964 start_id = limit_id; | |
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1965 } |
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1966 |
0 | 1967 |
1968 void SystemDictionary::initialize_preloaded_classes(TRAPS) { | |
1142 | 1969 assert(WK_KLASS(Object_klass) == NULL, "preloaded classes should only be initialized once"); |
0 | 1970 // Preload commonly used klasses |
132
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1971 WKID scan = FIRST_WKID; |
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1972 // first do Object, String, Class |
1142 | 1973 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
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1974 |
3938 | 1975 java_lang_Class::compute_offsets(); |
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1976 |
0 | 1977 // Fixup mirrors for classes loaded before java.lang.Class. |
1978 // These calls iterate over the objects currently in the perm gen | |
1979 // so calling them at this point is matters (not before when there | |
1980 // are fewer objects and not later after there are more objects | |
1981 // in the perm gen. | |
1982 Universe::initialize_basic_type_mirrors(CHECK); | |
1983 Universe::fixup_mirrors(CHECK); | |
1984 | |
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1985 // do a bunch more: |
1142 | 1986 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Reference_klass), scan, CHECK); |
0 | 1987 |
1988 // Preload ref klasses and set reference types | |
1142 | 1989 instanceKlass::cast(WK_KLASS(Reference_klass))->set_reference_type(REF_OTHER); |
1990 instanceRefKlass::update_nonstatic_oop_maps(WK_KLASS(Reference_klass)); | |
0 | 1991 |
1142 | 1992 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(PhantomReference_klass), scan, CHECK); |
1993 instanceKlass::cast(WK_KLASS(SoftReference_klass))->set_reference_type(REF_SOFT); | |
1994 instanceKlass::cast(WK_KLASS(WeakReference_klass))->set_reference_type(REF_WEAK); | |
1995 instanceKlass::cast(WK_KLASS(FinalReference_klass))->set_reference_type(REF_FINAL); | |
1996 instanceKlass::cast(WK_KLASS(PhantomReference_klass))->set_reference_type(REF_PHANTOM); | |
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1997 |
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1998 // JSR 292 classes |
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1999 WKID jsr292_group_start = WK_KLASS_ENUM_NAME(MethodHandle_klass); |
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2000 WKID jsr292_group_end = WK_KLASS_ENUM_NAME(VolatileCallSite_klass); |
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2001 initialize_wk_klasses_until(jsr292_group_start, scan, CHECK); |
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2002 if (EnableInvokeDynamic) { |
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2003 initialize_wk_klasses_through(jsr292_group_end, scan, CHECK); |
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2004 } else { |
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2005 // Skip the JSR 292 classes, if not enabled. |
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2006 scan = WKID(jsr292_group_end + 1); |
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2007 } |
710 | 2008 |
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2009 initialize_wk_klasses_until(WKID_LIMIT, scan, CHECK); |
0 | 2010 |
1142 | 2011 _box_klasses[T_BOOLEAN] = WK_KLASS(Boolean_klass); |
2012 _box_klasses[T_CHAR] = WK_KLASS(Character_klass); | |
2013 _box_klasses[T_FLOAT] = WK_KLASS(Float_klass); | |
2014 _box_klasses[T_DOUBLE] = WK_KLASS(Double_klass); | |
2015 _box_klasses[T_BYTE] = WK_KLASS(Byte_klass); | |
2016 _box_klasses[T_SHORT] = WK_KLASS(Short_klass); | |
2017 _box_klasses[T_INT] = WK_KLASS(Integer_klass); | |
2018 _box_klasses[T_LONG] = WK_KLASS(Long_klass); | |
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2019 //_box_klasses[T_OBJECT] = WK_KLASS(object_klass); |
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2020 //_box_klasses[T_ARRAY] = WK_KLASS(object_klass); |
0 | 2021 |
2022 #ifdef KERNEL | |
3938 | 2023 if (DownloadManager_klass() == NULL) { |
0 | 2024 warning("Cannot find sun/jkernel/DownloadManager"); |
2025 } | |
2026 #endif // KERNEL | |
514 | 2027 |
0 | 2028 { // Compute whether we should use loadClass or loadClassInternal when loading classes. |
1142 | 2029 methodOop method = instanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::loadClassInternal_name(), vmSymbols::string_class_signature()); |
0 | 2030 _has_loadClassInternal = (method != NULL); |
2031 } | |
2032 { // Compute whether we should use checkPackageAccess or NOT | |
1142 | 2033 methodOop method = instanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::checkPackageAccess_name(), vmSymbols::class_protectiondomain_signature()); |
0 | 2034 _has_checkPackageAccess = (method != NULL); |
2035 } | |
2036 } | |
2037 | |
2038 // Tells if a given klass is a box (wrapper class, such as java.lang.Integer). | |
2039 // If so, returns the basic type it holds. If not, returns T_OBJECT. | |
2040 BasicType SystemDictionary::box_klass_type(klassOop k) { | |
2041 assert(k != NULL, ""); | |
2042 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { | |
2043 if (_box_klasses[i] == k) | |
2044 return (BasicType)i; | |
2045 } | |
2046 return T_OBJECT; | |
2047 } | |
2048 | |
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2049 KlassHandle SystemDictionaryHandles::box_klass(BasicType t) { |
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2050 if (t >= T_BOOLEAN && t <= T_VOID) |
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2051 return KlassHandle(&SystemDictionary::_box_klasses[t], true); |
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2052 else |
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2053 return KlassHandle(); |
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2054 } |
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2055 |
0 | 2056 // Constraints on class loaders. The details of the algorithm can be |
2057 // found in the OOPSLA'98 paper "Dynamic Class Loading in the Java | |
2058 // Virtual Machine" by Sheng Liang and Gilad Bracha. The basic idea is | |
2059 // that the system dictionary needs to maintain a set of contraints that | |
2060 // must be satisfied by all classes in the dictionary. | |
2061 // if defining is true, then LinkageError if already in systemDictionary | |
2062 // if initiating loader, then ok if instanceKlass matches existing entry | |
2063 | |
2064 void SystemDictionary::check_constraints(int d_index, unsigned int d_hash, | |
2065 instanceKlassHandle k, | |
2066 Handle class_loader, bool defining, | |
2067 TRAPS) { | |
2068 const char *linkage_error = NULL; | |
2069 { | |
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2070 Symbol* name = k->name(); |
0 | 2071 MutexLocker mu(SystemDictionary_lock, THREAD); |
2072 | |
2073 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
2074 if (check != (klassOop)NULL) { | |
2075 // if different instanceKlass - duplicate class definition, | |
2076 // else - ok, class loaded by a different thread in parallel, | |
2077 // we should only have found it if it was done loading and ok to use | |
2078 // system dictionary only holds instance classes, placeholders | |
2079 // also holds array classes | |
2080 | |
2081 assert(check->klass_part()->oop_is_instance(), "noninstance in systemdictionary"); | |
2082 if ((defining == true) || (k() != check)) { | |
2083 linkage_error = "loader (instance of %s): attempted duplicate class " | |
2084 "definition for name: \"%s\""; | |
2085 } else { | |
2086 return; | |
2087 } | |
2088 } | |
2089 | |
2090 #ifdef ASSERT | |
2177
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2091 Symbol* ph_check = find_placeholder(name, class_loader); |
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2092 assert(ph_check == NULL || ph_check == name, "invalid symbol"); |
0 | 2093 #endif |
2094 | |
2095 if (linkage_error == NULL) { | |
2096 if (constraints()->check_or_update(k, class_loader, name) == false) { | |
2097 linkage_error = "loader constraint violation: loader (instance of %s)" | |
2098 " previously initiated loading for a different type with name \"%s\""; | |
2099 } | |
2100 } | |
2101 } | |
2102 | |
2103 // Throw error now if needed (cannot throw while holding | |
2104 // SystemDictionary_lock because of rank ordering) | |
2105 | |
2106 if (linkage_error) { | |
2107 ResourceMark rm(THREAD); | |
2108 const char* class_loader_name = loader_name(class_loader()); | |
2109 char* type_name = k->name()->as_C_string(); | |
2110 size_t buflen = strlen(linkage_error) + strlen(class_loader_name) + | |
2111 strlen(type_name); | |
2112 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
2113 jio_snprintf(buf, buflen, linkage_error, class_loader_name, type_name); | |
2114 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); | |
2115 } | |
2116 } | |
2117 | |
2118 | |
2119 // Update system dictionary - done after check_constraint and add_to_hierachy | |
2120 // have been called. | |
2121 void SystemDictionary::update_dictionary(int d_index, unsigned int d_hash, | |
2122 int p_index, unsigned int p_hash, | |
2123 instanceKlassHandle k, | |
2124 Handle class_loader, | |
2125 TRAPS) { | |
2126 // Compile_lock prevents systemDictionary updates during compilations | |
2127 assert_locked_or_safepoint(Compile_lock); | |
2177
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2128 Symbol* name = k->name(); |
0 | 2129 |
2130 { | |
2131 MutexLocker mu1(SystemDictionary_lock, THREAD); | |
2132 | |
2133 // See whether biased locking is enabled and if so set it for this | |
2134 // klass. | |
2135 // Note that this must be done past the last potential blocking | |
2136 // point / safepoint. We enable biased locking lazily using a | |
2137 // VM_Operation to iterate the SystemDictionary and installing the | |
2138 // biasable mark word into each instanceKlass's prototype header. | |
2139 // To avoid race conditions where we accidentally miss enabling the | |
2140 // optimization for one class in the process of being added to the | |
2141 // dictionary, we must not safepoint after the test of | |
2142 // BiasedLocking::enabled(). | |
2143 if (UseBiasedLocking && BiasedLocking::enabled()) { | |
2144 // Set biased locking bit for all loaded classes; it will be | |
2145 // cleared if revocation occurs too often for this type | |
2146 // NOTE that we must only do this when the class is initally | |
2147 // defined, not each time it is referenced from a new class loader | |
2148 if (k->class_loader() == class_loader()) { | |
2149 k->set_prototype_header(markOopDesc::biased_locking_prototype()); | |
2150 } | |
2151 } | |
2152 | |
4800
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2153 // Assign a classid if one has not already been assigned. The |
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2154 // counter does not need to be atomically incremented since this |
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2155 // is only done while holding the SystemDictionary_lock. |
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2156 // All loaded classes get a unique ID. |
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2157 TRACE_INIT_ID(k); |
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2158 |
0 | 2159 // Check for a placeholder. If there, remove it and make a |
2160 // new system dictionary entry. | |
2161 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
2162 klassOop sd_check = find_class(d_index, d_hash, name, class_loader); | |
2163 if (sd_check == NULL) { | |
2164 dictionary()->add_klass(name, class_loader, k); | |
2165 notice_modification(); | |
2166 } | |
2167 #ifdef ASSERT | |
2168 sd_check = find_class(d_index, d_hash, name, class_loader); | |
2169 assert (sd_check != NULL, "should have entry in system dictionary"); | |
2170 // Changed to allow PH to remain to complete class circularity checking | |
2171 // while only one thread can define a class at one time, multiple | |
2172 // classes can resolve the superclass for a class at one time, | |
2173 // and the placeholder is used to track that | |
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2174 // Symbol* ph_check = find_placeholder(name, class_loader); |
0 | 2175 // assert (ph_check == NULL, "should not have a placeholder entry"); |
2176 #endif | |
2177 SystemDictionary_lock->notify_all(); | |
2178 } | |
2179 } | |
2180 | |
2181 | |
2244
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2182 // Try to find a class name using the loader constraints. The |
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2183 // loader constraints might know about a class that isn't fully loaded |
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2184 // yet and these will be ignored. |
0 | 2185 klassOop SystemDictionary::find_constrained_instance_or_array_klass( |
2177
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2186 Symbol* class_name, Handle class_loader, TRAPS) { |
0 | 2187 |
2188 // First see if it has been loaded directly. | |
2189 // Force the protection domain to be null. (This removes protection checks.) | |
2190 Handle no_protection_domain; | |
2191 klassOop klass = find_instance_or_array_klass(class_name, class_loader, | |
2192 no_protection_domain, CHECK_NULL); | |
2193 if (klass != NULL) | |
2194 return klass; | |
2195 | |
2196 // Now look to see if it has been loaded elsewhere, and is subject to | |
2197 // a loader constraint that would require this loader to return the | |
2198 // klass that is already loaded. | |
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2199 if (FieldType::is_array(class_name)) { |
1336 | 2200 // For array classes, their klassOops are not kept in the |
2201 // constraint table. The element klassOops are. | |
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2202 FieldArrayInfo fd; |
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2203 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
0 | 2204 if (t != T_OBJECT) { |
2205 klass = Universe::typeArrayKlassObj(t); | |
2206 } else { | |
2207 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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2208 klass = constraints()->find_constrained_klass(fd.object_key(), class_loader); |
0 | 2209 } |
1336 | 2210 // If element class already loaded, allocate array klass |
0 | 2211 if (klass != NULL) { |
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2212 klass = Klass::cast(klass)->array_klass_or_null(fd.dimension()); |
0 | 2213 } |
2214 } else { | |
2215 MutexLocker mu(SystemDictionary_lock, THREAD); | |
2216 // Non-array classes are easy: simply check the constraint table. | |
2217 klass = constraints()->find_constrained_klass(class_name, class_loader); | |
2218 } | |
2219 | |
2220 return klass; | |
2221 } | |
2222 | |
2223 | |
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2224 bool SystemDictionary::add_loader_constraint(Symbol* class_name, |
0 | 2225 Handle class_loader1, |
2226 Handle class_loader2, | |
2227 Thread* THREAD) { | |
2177
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2228 Symbol* constraint_name = NULL; |
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2229 if (!FieldType::is_array(class_name)) { |
1336 | 2230 constraint_name = class_name; |
2231 } else { | |
2232 // For array classes, their klassOops are not kept in the | |
2233 // constraint table. The element classes are. | |
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2234 FieldArrayInfo fd; |
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2235 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(false)); |
1336 | 2236 // primitive types always pass |
2237 if (t != T_OBJECT) { | |
2238 return true; | |
2239 } else { | |
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2240 constraint_name = fd.object_key(); |
1336 | 2241 } |
2242 } | |
2243 unsigned int d_hash1 = dictionary()->compute_hash(constraint_name, class_loader1); | |
0 | 2244 int d_index1 = dictionary()->hash_to_index(d_hash1); |
2245 | |
1336 | 2246 unsigned int d_hash2 = dictionary()->compute_hash(constraint_name, class_loader2); |
0 | 2247 int d_index2 = dictionary()->hash_to_index(d_hash2); |
2248 { | |
1336 | 2249 MutexLocker mu_s(SystemDictionary_lock, THREAD); |
0 | 2250 |
1336 | 2251 // Better never do a GC while we're holding these oops |
2252 No_Safepoint_Verifier nosafepoint; | |
0 | 2253 |
1336 | 2254 klassOop klass1 = find_class(d_index1, d_hash1, constraint_name, class_loader1); |
2255 klassOop klass2 = find_class(d_index2, d_hash2, constraint_name, class_loader2); | |
2256 return constraints()->add_entry(constraint_name, klass1, class_loader1, | |
2257 klass2, class_loader2); | |
0 | 2258 } |
2259 } | |
2260 | |
2261 // Add entry to resolution error table to record the error when the first | |
2262 // attempt to resolve a reference to a class has failed. | |
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2263 void SystemDictionary::add_resolution_error(constantPoolHandle pool, int which, Symbol* error) { |
0 | 2264 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
2265 int index = resolution_errors()->hash_to_index(hash); | |
2266 { | |
2267 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
2268 resolution_errors()->add_entry(index, hash, pool, which, error); | |
2269 } | |
2270 } | |
2271 | |
2272 // Lookup resolution error table. Returns error if found, otherwise NULL. | |
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2273 Symbol* SystemDictionary::find_resolution_error(constantPoolHandle pool, int which) { |
0 | 2274 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
2275 int index = resolution_errors()->hash_to_index(hash); | |
2276 { | |
2277 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
2278 ResolutionErrorEntry* entry = resolution_errors()->find_entry(index, hash, pool, which); | |
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2279 return (entry != NULL) ? entry->error() : (Symbol*)NULL; |
0 | 2280 } |
2281 } | |
2282 | |
2283 | |
665
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2284 // Signature constraints ensure that callers and callees agree about |
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2285 // the meaning of type names in their signatures. This routine is the |
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2286 // intake for constraints. It collects them from several places: |
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2287 // |
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2288 // * LinkResolver::resolve_method (if check_access is true) requires |
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2289 // that the resolving class (the caller) and the defining class of |
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2290 // the resolved method (the callee) agree on each type in the |
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2291 // method's signature. |
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2292 // |
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2293 // * LinkResolver::resolve_interface_method performs exactly the same |
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2294 // checks. |
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2295 // |
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2296 // * LinkResolver::resolve_field requires that the constant pool |
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2297 // attempting to link to a field agree with the field's defining |
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2298 // class about the type of the field signature. |
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2299 // |
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2300 // * klassVtable::initialize_vtable requires that, when a class |
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2301 // overrides a vtable entry allocated by a superclass, that the |
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2302 // overriding method (i.e., the callee) agree with the superclass |
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2303 // on each type in the method's signature. |
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2304 // |
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2305 // * klassItable::initialize_itable requires that, when a class fills |
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2306 // in its itables, for each non-abstract method installed in an |
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2307 // itable, the method (i.e., the callee) agree with the interface |
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2308 // on each type in the method's signature. |
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2309 // |
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2310 // All those methods have a boolean (check_access, checkconstraints) |
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2311 // which turns off the checks. This is used from specialized contexts |
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2312 // such as bootstrapping, dumping, and debugging. |
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2313 // |
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2314 // No direct constraint is placed between the class and its |
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2315 // supertypes. Constraints are only placed along linked relations |
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2316 // between callers and callees. When a method overrides or implements |
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2317 // an abstract method in a supertype (superclass or interface), the |
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2318 // constraints are placed as if the supertype were the caller to the |
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2319 // overriding method. (This works well, since callers to the |
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2320 // supertype have already established agreement between themselves and |
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2321 // the supertype.) As a result of all this, a class can disagree with |
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2322 // its supertype about the meaning of a type name, as long as that |
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2323 // class neither calls a relevant method of the supertype, nor is |
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2324 // called (perhaps via an override) from the supertype. |
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2325 // |
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2326 // |
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2327 // SystemDictionary::check_signature_loaders(sig, l1, l2) |
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2328 // |
0 | 2329 // Make sure all class components (including arrays) in the given |
2330 // signature will be resolved to the same class in both loaders. | |
2331 // Returns the name of the type that failed a loader constraint check, or | |
2332 // NULL if no constraint failed. The returned C string needs cleaning up | |
665
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2333 // with a ResourceMark in the caller. No exception except OOME is thrown. |
1336 | 2334 // Arrays are not added to the loader constraint table, their elements are. |
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2335 char* SystemDictionary::check_signature_loaders(Symbol* signature, |
0 | 2336 Handle loader1, Handle loader2, |
2337 bool is_method, TRAPS) { | |
2338 // Nothing to do if loaders are the same. | |
2339 if (loader1() == loader2()) { | |
2340 return NULL; | |
2341 } | |
2342 | |
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2343 ResourceMark rm(THREAD); |
0 | 2344 SignatureStream sig_strm(signature, is_method); |
2345 while (!sig_strm.is_done()) { | |
2346 if (sig_strm.is_object()) { | |
2177
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2347 Symbol* s = sig_strm.as_symbol(CHECK_NULL); |
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diff
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2348 Symbol* sig = s; |
0 | 2349 if (!add_loader_constraint(sig, loader1, loader2, THREAD)) { |
2177
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diff
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2350 return sig->as_C_string(); |
0 | 2351 } |
2352 } | |
2353 sig_strm.next(); | |
2354 } | |
2355 return NULL; | |
2356 } | |
2357 | |
2358 | |
2177
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2359 methodOop SystemDictionary::find_method_handle_invoke(Symbol* name, |
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diff
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|
2360 Symbol* signature, |
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|
2361 KlassHandle accessing_klass, |
710 | 2362 TRAPS) { |
2416
38fea01eb669
6817525: turn on method handle functionality by default for JSR 292
twisti
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2357
diff
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|
2363 if (!EnableInvokeDynamic) return NULL; |
2177
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diff
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|
2364 vmSymbols::SID name_id = vmSymbols::find_sid(name); |
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|
2365 assert(name_id != vmSymbols::NO_SID, "must be a known name"); |
cd5dbf694d45
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|
2366 unsigned int hash = invoke_method_table()->compute_hash(signature, name_id); |
710 | 2367 int index = invoke_method_table()->hash_to_index(hash); |
1507
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|
2368 SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, name_id); |
1508
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|
2369 methodHandle non_cached_result; |
710 | 2370 if (spe == NULL || spe->property_oop() == NULL) { |
1508
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|
2371 spe = NULL; |
710 | 2372 // Must create lots of stuff here, but outside of the SystemDictionary lock. |
1410
b30a2cd5e3a2
Added methods to c1x_VMExits.cpp
Thomas Wuerthinger <thomas.wuerthinger@gmail.com>
parents:
1407
diff
changeset
|
2373 // (tw) May we do this? |
b30a2cd5e3a2
Added methods to c1x_VMExits.cpp
Thomas Wuerthinger <thomas.wuerthinger@gmail.com>
parents:
1407
diff
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|
2374 //if (THREAD->is_Compiler_thread()) |
b30a2cd5e3a2
Added methods to c1x_VMExits.cpp
Thomas Wuerthinger <thomas.wuerthinger@gmail.com>
parents:
1407
diff
changeset
|
2375 // return NULL; // do not attempt from within compiler |
2460 | 2376 bool for_invokeGeneric = (name_id != vmSymbols::VM_SYMBOL_ENUM_NAME(invokeExact_name)); |
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|
2377 bool found_on_bcp = false; |
2177
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2378 Handle mt = find_method_handle_type(signature, accessing_klass, |
1793
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|
2379 for_invokeGeneric, |
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diff
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|
2380 found_on_bcp, CHECK_NULL); |
710 | 2381 KlassHandle mh_klass = SystemDictionaryHandles::MethodHandle_klass(); |
1507
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|
2382 methodHandle m = methodOopDesc::make_invoke_method(mh_klass, name, signature, |
710 | 2383 mt, CHECK_NULL); |
2384 // Now grab the lock. We might have to throw away the new method, | |
2385 // if a racing thread has managed to install one at the same time. | |
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|
2386 if (found_on_bcp) { |
710 | 2387 MutexLocker ml(SystemDictionary_lock, Thread::current()); |
1507
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jrose
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|
2388 spe = invoke_method_table()->find_entry(index, hash, signature, name_id); |
710 | 2389 if (spe == NULL) |
1507
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jrose
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diff
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|
2390 spe = invoke_method_table()->add_entry(index, hash, signature, name_id); |
3363
167b70ff3abc
6939861: JVM should handle more conversion operations
never
parents:
3245
diff
changeset
|
2391 if (spe->property_oop() == NULL) { |
710 | 2392 spe->set_property_oop(m()); |
3363
167b70ff3abc
6939861: JVM should handle more conversion operations
never
parents:
3245
diff
changeset
|
2393 // Link m to his method type, if it is suitably generic. |
167b70ff3abc
6939861: JVM should handle more conversion operations
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parents:
3245
diff
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|
2394 oop mtform = java_lang_invoke_MethodType::form(mt()); |
167b70ff3abc
6939861: JVM should handle more conversion operations
never
parents:
3245
diff
changeset
|
2395 if (mtform != NULL && mt() == java_lang_invoke_MethodTypeForm::erasedType(mtform) |
3461
81d815b05abb
7056328: JSR 292 invocation sometimes fails in adapters for types not on boot class path
jrose
parents:
3363
diff
changeset
|
2396 // vmlayout must be an invokeExact: |
81d815b05abb
7056328: JSR 292 invocation sometimes fails in adapters for types not on boot class path
jrose
parents:
3363
diff
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|
2397 && name_id == vmSymbols::VM_SYMBOL_ENUM_NAME(invokeExact_name) |
3363
167b70ff3abc
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parents:
3245
diff
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|
2398 && java_lang_invoke_MethodTypeForm::vmlayout_offset_in_bytes() > 0) { |
167b70ff3abc
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never
parents:
3245
diff
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|
2399 java_lang_invoke_MethodTypeForm::init_vmlayout(mtform, m()); |
167b70ff3abc
6939861: JVM should handle more conversion operations
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parents:
3245
diff
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|
2400 } |
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parents:
3245
diff
changeset
|
2401 } |
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|
2402 } else { |
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|
2403 non_cached_result = m; |
710 | 2404 } |
2405 } | |
1508
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|
2406 if (spe != NULL && spe->property_oop() != NULL) { |
2ffde6cfe049
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|
2407 assert(spe->property_oop()->is_method(), ""); |
2ffde6cfe049
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|
2408 return (methodOop) spe->property_oop(); |
2ffde6cfe049
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jrose
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diff
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|
2409 } else { |
2ffde6cfe049
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diff
changeset
|
2410 return non_cached_result(); |
2ffde6cfe049
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diff
changeset
|
2411 } |
710 | 2412 } |
2413 | |
2357
8033953d67ff
7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents:
2356
diff
changeset
|
2414 // Ask Java code to find or construct a java.lang.invoke.MethodType for the given |
710 | 2415 // signature, as interpreted relative to the given class loader. |
2416 // Because of class loader constraints, all method handle usage must be | |
2417 // consistent with this loader. | |
2177
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6990754: Use native memory and reference counting to implement SymbolTable
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diff
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|
2418 Handle SystemDictionary::find_method_handle_type(Symbol* signature, |
1508
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|
2419 KlassHandle accessing_klass, |
1793
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6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
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|
2420 bool for_invokeGeneric, |
1508
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|
2421 bool& return_bcp_flag, |
1507
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6939134: JSR 292 adjustments to method handle invocation
jrose
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diff
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|
2422 TRAPS) { |
1508
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diff
changeset
|
2423 Handle class_loader, protection_domain; |
2ffde6cfe049
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|
2424 bool is_on_bcp = true; // keep this true as long as we can materialize from the boot classloader |
710 | 2425 Handle empty; |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2426 int npts = ArgumentCount(signature).size(); |
1142 | 2427 objArrayHandle pts = oopFactory::new_objArray(SystemDictionary::Class_klass(), npts, CHECK_(empty)); |
710 | 2428 int arg = 0; |
2429 Handle rt; // the return type from the signature | |
2177
3582bf76420e
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coleenp
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diff
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|
2430 ResourceMark rm(THREAD); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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diff
changeset
|
2431 for (SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
1508
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jrose
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diff
changeset
|
2432 oop mirror = NULL; |
2ffde6cfe049
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1507
diff
changeset
|
2433 if (is_on_bcp) { |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2434 mirror = ss.as_java_mirror(class_loader, protection_domain, |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2435 SignatureStream::ReturnNull, CHECK_(empty)); |
2ffde6cfe049
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jrose
parents:
1507
diff
changeset
|
2436 if (mirror == NULL) { |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2437 // fall back from BCP to accessing_klass |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
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diff
changeset
|
2438 if (accessing_klass.not_null()) { |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
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1507
diff
changeset
|
2439 class_loader = Handle(THREAD, instanceKlass::cast(accessing_klass())->class_loader()); |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2440 protection_domain = Handle(THREAD, instanceKlass::cast(accessing_klass())->protection_domain()); |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2441 } |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2442 is_on_bcp = false; |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
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1507
diff
changeset
|
2443 } |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2444 } |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2445 if (!is_on_bcp) { |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
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1507
diff
changeset
|
2446 // Resolve, throwing a real error if it doesn't work. |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2447 mirror = ss.as_java_mirror(class_loader, protection_domain, |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2448 SignatureStream::NCDFError, CHECK_(empty)); |
710 | 2449 } |
2450 if (ss.at_return_type()) | |
2451 rt = Handle(THREAD, mirror); | |
2452 else | |
2453 pts->obj_at_put(arg++, mirror); | |
1508
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
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1507
diff
changeset
|
2454 // Check accessibility. |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2455 if (ss.is_object() && accessing_klass.not_null()) { |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2456 klassOop sel_klass = java_lang_Class::as_klassOop(mirror); |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2457 // Emulate constantPoolOopDesc::verify_constant_pool_resolve. |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2458 if (Klass::cast(sel_klass)->oop_is_objArray()) |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
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1507
diff
changeset
|
2459 sel_klass = objArrayKlass::cast(sel_klass)->bottom_klass(); |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
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1507
diff
changeset
|
2460 if (Klass::cast(sel_klass)->oop_is_instance()) { |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2461 KlassHandle sel_kh(THREAD, sel_klass); |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2462 LinkResolver::check_klass_accessability(accessing_klass, sel_kh, CHECK_(empty)); |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
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1507
diff
changeset
|
2463 } |
2ffde6cfe049
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diff
changeset
|
2464 } |
710 | 2465 } |
2466 assert(arg == npts, ""); | |
2467 | |
2357
8033953d67ff
7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents:
2356
diff
changeset
|
2468 // call java.lang.invoke.MethodHandleNatives::findMethodType(Class rt, Class[] pts) -> MethodType |
710 | 2469 JavaCallArguments args(Handle(THREAD, rt())); |
2470 args.push_oop(pts()); | |
2471 JavaValue result(T_OBJECT); | |
2472 JavaCalls::call_static(&result, | |
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
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1339
diff
changeset
|
2473 SystemDictionary::MethodHandleNatives_klass(), |
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
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1339
diff
changeset
|
2474 vmSymbols::findMethodHandleType_name(), |
2460 | 2475 vmSymbols::findMethodHandleType_signature(), |
710 | 2476 &args, CHECK_(empty)); |
1793
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
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1660
diff
changeset
|
2477 Handle method_type(THREAD, (oop) result.get_jobject()); |
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
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1660
diff
changeset
|
2478 |
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
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1660
diff
changeset
|
2479 if (for_invokeGeneric) { |
2357
8033953d67ff
7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents:
2356
diff
changeset
|
2480 // call java.lang.invoke.MethodHandleNatives::notifyGenericMethodType(MethodType) -> void |
1793
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
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1660
diff
changeset
|
2481 JavaCallArguments args(Handle(THREAD, method_type())); |
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
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1660
diff
changeset
|
2482 JavaValue no_result(T_VOID); |
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
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1660
diff
changeset
|
2483 JavaCalls::call_static(&no_result, |
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
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1660
diff
changeset
|
2484 SystemDictionary::MethodHandleNatives_klass(), |
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
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1660
diff
changeset
|
2485 vmSymbols::notifyGenericMethodType_name(), |
2460 | 2486 vmSymbols::notifyGenericMethodType_signature(), |
1793
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
changeset
|
2487 &args, THREAD); |
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
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1660
diff
changeset
|
2488 if (HAS_PENDING_EXCEPTION) { |
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
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1660
diff
changeset
|
2489 // If the notification fails, just kill it. |
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
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1660
diff
changeset
|
2490 CLEAR_PENDING_EXCEPTION; |
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
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1660
diff
changeset
|
2491 } |
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
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1660
diff
changeset
|
2492 } |
1508
2ffde6cfe049
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diff
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|
2493 |
2ffde6cfe049
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1507
diff
changeset
|
2494 // report back to the caller with the MethodType and the "on_bcp" flag |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
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1507
diff
changeset
|
2495 return_bcp_flag = is_on_bcp; |
1793
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
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1660
diff
changeset
|
2496 return method_type; |
710 | 2497 } |
2498 | |
1602 | 2499 // Ask Java code to find or construct a method handle constant. |
2500 Handle SystemDictionary::link_method_handle_constant(KlassHandle caller, | |
2501 int ref_kind, //e.g., JVM_REF_invokeVirtual | |
2502 KlassHandle callee, | |
2177
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diff
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|
2503 Symbol* name_sym, |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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diff
changeset
|
2504 Symbol* signature, |
1602 | 2505 TRAPS) { |
2506 Handle empty; | |
2177
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coleenp
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diff
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|
2507 Handle name = java_lang_String::create_from_symbol(name_sym, CHECK_(empty)); |
1602 | 2508 Handle type; |
2509 if (signature->utf8_length() > 0 && signature->byte_at(0) == '(') { | |
2510 bool ignore_is_on_bcp = false; | |
1793
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
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1660
diff
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|
2511 type = find_method_handle_type(signature, caller, false, ignore_is_on_bcp, CHECK_(empty)); |
1602 | 2512 } else { |
2177
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coleenp
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diff
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|
2513 ResourceMark rm(THREAD); |
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diff
changeset
|
2514 SignatureStream ss(signature, false); |
1602 | 2515 if (!ss.is_done()) { |
2516 oop mirror = ss.as_java_mirror(caller->class_loader(), caller->protection_domain(), | |
2517 SignatureStream::NCDFError, CHECK_(empty)); | |
2518 type = Handle(THREAD, mirror); | |
2519 ss.next(); | |
2520 if (!ss.is_done()) type = Handle(); // error! | |
2521 } | |
2522 } | |
2523 if (type.is_null()) { | |
2524 THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad signature", empty); | |
2525 } | |
2526 | |
2357
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7012648: move JSR 292 to package java.lang.invoke and adjust names
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diff
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|
2527 // call java.lang.invoke.MethodHandleNatives::linkMethodHandleConstant(Class caller, int refKind, Class callee, String name, Object type) -> MethodHandle |
1602 | 2528 JavaCallArguments args; |
2529 args.push_oop(caller->java_mirror()); // the referring class | |
2530 args.push_int(ref_kind); | |
2531 args.push_oop(callee->java_mirror()); // the target class | |
2532 args.push_oop(name()); | |
2533 args.push_oop(type()); | |
2534 JavaValue result(T_OBJECT); | |
2535 JavaCalls::call_static(&result, | |
2536 SystemDictionary::MethodHandleNatives_klass(), | |
2537 vmSymbols::linkMethodHandleConstant_name(), | |
2460 | 2538 vmSymbols::linkMethodHandleConstant_signature(), |
1602 | 2539 &args, CHECK_(empty)); |
2540 return Handle(THREAD, (oop) result.get_jobject()); | |
2541 } | |
710 | 2542 |
2357
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diff
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|
2543 // Ask Java code to find or construct a java.lang.invoke.CallSite for the given |
726
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6655646: dynamic languages need dynamically linked call sites
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diff
changeset
|
2544 // name and signature, as interpreted relative to the given class loader. |
1507
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|
2545 Handle SystemDictionary::make_dynamic_call_site(Handle bootstrap_method, |
2177
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diff
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|
2546 Symbol* name, |
1507
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1339
diff
changeset
|
2547 methodHandle signature_invoker, |
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
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diff
changeset
|
2548 Handle info, |
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
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diff
changeset
|
2549 methodHandle caller_method, |
726
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6655646: dynamic languages need dynamically linked call sites
jrose
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710
diff
changeset
|
2550 int caller_bci, |
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6655646: dynamic languages need dynamically linked call sites
jrose
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diff
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|
2551 TRAPS) { |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
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710
diff
changeset
|
2552 Handle empty; |
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
changeset
|
2553 guarantee(bootstrap_method.not_null() && |
2357
8033953d67ff
7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
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2356
diff
changeset
|
2554 java_lang_invoke_MethodHandle::is_instance(bootstrap_method()), |
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
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1602
diff
changeset
|
2555 "caller must supply a valid BSM"); |
083fde3b838e
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1602
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|
2556 |
1507
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6939134: JSR 292 adjustments to method handle invocation
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|
2557 Handle caller_mname = MethodHandles::new_MemberName(CHECK_(empty)); |
cd5dbf694d45
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|
2558 MethodHandles::init_MemberName(caller_mname(), caller_method()); |
cd5dbf694d45
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|
2559 |
2357
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diff
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|
2560 // call java.lang.invoke.MethodHandleNatives::makeDynamicCallSite(bootm, name, mtype, info, caller_mname, caller_pos) |
2177
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2001
diff
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|
2561 oop name_str_oop = StringTable::intern(name, CHECK_(empty)); // not a handle! |
1507
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jrose
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diff
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|
2562 JavaCallArguments args(Handle(THREAD, bootstrap_method())); |
726
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diff
changeset
|
2563 args.push_oop(name_str_oop); |
1507
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jrose
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diff
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|
2564 args.push_oop(signature_invoker->method_handle_type()); |
cd5dbf694d45
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jrose
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1339
diff
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|
2565 args.push_oop(info()); |
cd5dbf694d45
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diff
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|
2566 args.push_oop(caller_mname()); |
726
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6655646: dynamic languages need dynamically linked call sites
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diff
changeset
|
2567 args.push_int(caller_bci); |
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|
2568 JavaValue result(T_OBJECT); |
be93aad57795
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jrose
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diff
changeset
|
2569 JavaCalls::call_static(&result, |
1507
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6939134: JSR 292 adjustments to method handle invocation
jrose
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1339
diff
changeset
|
2570 SystemDictionary::MethodHandleNatives_klass(), |
cd5dbf694d45
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diff
changeset
|
2571 vmSymbols::makeDynamicCallSite_name(), |
2460 | 2572 vmSymbols::makeDynamicCallSite_signature(), |
726
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6655646: dynamic languages need dynamically linked call sites
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|
2573 &args, CHECK_(empty)); |
be93aad57795
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jrose
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diff
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|
2574 oop call_site_oop = (oop) result.get_jobject(); |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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875
diff
changeset
|
2575 assert(call_site_oop->is_oop() |
2357
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jrose
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diff
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|
2576 /*&& java_lang_invoke_CallSite::is_instance(call_site_oop)*/, "must be sane"); |
726
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diff
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|
2577 if (TraceMethodHandles) { |
1059
389049f3f393
6858164: invokedynamic code needs some cleanup (post-6655638)
jrose
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1039
diff
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|
2578 #ifndef PRODUCT |
726
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6655646: dynamic languages need dynamically linked call sites
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diff
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|
2579 tty->print_cr("Linked invokedynamic bci=%d site="INTPTR_FORMAT":", caller_bci, call_site_oop); |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
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diff
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|
2580 call_site_oop->print(); |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
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diff
changeset
|
2581 tty->cr(); |
1059
389049f3f393
6858164: invokedynamic code needs some cleanup (post-6655638)
jrose
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1039
diff
changeset
|
2582 #endif //PRODUCT |
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
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diff
changeset
|
2583 } |
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jrose
parents:
710
diff
changeset
|
2584 return call_site_oop; |
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6655646: dynamic languages need dynamically linked call sites
jrose
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diff
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|
2585 } |
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diff
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|
2586 |
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
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1602
diff
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|
2587 Handle SystemDictionary::find_bootstrap_method(methodHandle caller_method, int caller_bci, |
1913
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jrose
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1903
diff
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|
2588 int cache_index, |
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
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diff
changeset
|
2589 Handle& argument_info_result, |
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
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1903
diff
changeset
|
2590 TRAPS) { |
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
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diff
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|
2591 Handle empty; |
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
changeset
|
2592 |
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
changeset
|
2593 constantPoolHandle pool; |
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
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1602
diff
changeset
|
2594 { |
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
changeset
|
2595 klassOop caller = caller_method->method_holder(); |
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
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|
2596 if (!Klass::cast(caller)->oop_is_instance()) return empty; |
083fde3b838e
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jrose
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1602
diff
changeset
|
2597 pool = constantPoolHandle(THREAD, instanceKlass::cast(caller)->constants()); |
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6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
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|
2598 } |
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6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
changeset
|
2599 |
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
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|
2600 int constant_pool_index = pool->cache()->entry_at(cache_index)->constant_pool_index(); |
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
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|
2601 constantTag tag = pool->tag_at(constant_pool_index); |
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
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1602
diff
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|
2602 |
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
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|
2603 if (tag.is_invoke_dynamic()) { |
1913
3b2dea75431e
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jrose
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1903
diff
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|
2604 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments |
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
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|
2605 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry. |
083fde3b838e
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jrose
parents:
1602
diff
changeset
|
2606 int bsm_index = pool->invoke_dynamic_bootstrap_method_ref_index_at(constant_pool_index); |
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
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|
2607 if (bsm_index != 0) { |
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2608 int bsm_index_in_cache = pool->cache()->entry_at(cache_index)->bootstrap_method_index_in_cache(); |
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
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|
2609 DEBUG_ONLY(int bsm_index_2 = pool->cache()->entry_at(bsm_index_in_cache)->constant_pool_index()); |
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2610 assert(bsm_index == bsm_index_2, "BSM constant lifted to cache"); |
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
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|
2611 if (TraceMethodHandles) { |
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
changeset
|
2612 tty->print_cr("resolving bootstrap method for "PTR_FORMAT" at %d at cache[%d]CP[%d]...", |
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2613 (intptr_t) caller_method(), caller_bci, cache_index, constant_pool_index); |
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
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|
2614 } |
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2615 oop bsm_oop = pool->resolve_cached_constant_at(bsm_index_in_cache, CHECK_(empty)); |
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2616 if (TraceMethodHandles) { |
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2617 tty->print_cr("bootstrap method for "PTR_FORMAT" at %d retrieved as "PTR_FORMAT":", |
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2618 (intptr_t) caller_method(), caller_bci, (intptr_t) bsm_oop); |
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
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|
2619 } |
1913
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
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1903
diff
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|
2620 assert(bsm_oop->is_oop(), "must be sane"); |
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
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1903
diff
changeset
|
2621 // caller must verify that it is of type MethodHandle |
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
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1903
diff
changeset
|
2622 Handle bsm(THREAD, bsm_oop); |
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
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1903
diff
changeset
|
2623 bsm_oop = NULL; // safety |
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2624 |
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
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1903
diff
changeset
|
2625 // Extract the optional static arguments. |
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
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1903
diff
changeset
|
2626 Handle argument_info; // either null, or one arg, or Object[]{arg...} |
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
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1903
diff
changeset
|
2627 int argc = pool->invoke_dynamic_argument_count_at(constant_pool_index); |
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
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1903
diff
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|
2628 if (TraceInvokeDynamic) { |
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
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1903
diff
changeset
|
2629 tty->print_cr("find_bootstrap_method: [%d/%d] CONSTANT_InvokeDynamic: %d[%d]", |
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
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1903
diff
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|
2630 constant_pool_index, cache_index, bsm_index, argc); |
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
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1903
diff
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|
2631 } |
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
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diff
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|
2632 if (argc > 0) { |
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
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1903
diff
changeset
|
2633 objArrayHandle arg_array; |
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
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1903
diff
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|
2634 if (argc > 1) { |
3b2dea75431e
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jrose
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1903
diff
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|
2635 objArrayOop arg_array_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), argc, CHECK_(empty)); |
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
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1903
diff
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|
2636 arg_array = objArrayHandle(THREAD, arg_array_oop); |
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
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1903
diff
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|
2637 argument_info = arg_array; |
3b2dea75431e
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1903
diff
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|
2638 } |
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
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1903
diff
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|
2639 for (int arg_i = 0; arg_i < argc; arg_i++) { |
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
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1903
diff
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|
2640 int arg_index = pool->invoke_dynamic_argument_index_at(constant_pool_index, arg_i); |
3b2dea75431e
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jrose
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1903
diff
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|
2641 oop arg_oop = pool->resolve_possibly_cached_constant_at(arg_index, CHECK_(empty)); |
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
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1903
diff
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|
2642 if (arg_array.is_null()) { |
3b2dea75431e
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jrose
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1903
diff
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|
2643 argument_info = Handle(THREAD, arg_oop); |
3b2dea75431e
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1903
diff
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|
2644 } else { |
3b2dea75431e
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1903
diff
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|
2645 arg_array->obj_at_put(arg_i, arg_oop); |
3b2dea75431e
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|
2646 } |
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|
2647 } |
3b2dea75431e
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|
2648 } |
3b2dea75431e
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|
2649 |
3b2dea75431e
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diff
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|
2650 argument_info_result = argument_info; // return argument_info to caller |
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
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1903
diff
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|
2651 return bsm; |
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
changeset
|
2652 } |
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
changeset
|
2653 } else { |
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
changeset
|
2654 ShouldNotReachHere(); // verifier does not allow this |
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
changeset
|
2655 } |
083fde3b838e
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jrose
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1602
diff
changeset
|
2656 |
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
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1339
diff
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|
2657 return empty; |
726
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6655646: dynamic languages need dynamically linked call sites
jrose
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710
diff
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|
2658 } |
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|
2659 |
0 | 2660 // Since the identity hash code for symbols changes when the symbols are |
2661 // moved from the regular perm gen (hash in the mark word) to the shared | |
2662 // spaces (hash is the address), the classes loaded into the dictionary | |
2663 // may be in the wrong buckets. | |
2664 | |
2665 void SystemDictionary::reorder_dictionary() { | |
2666 dictionary()->reorder_dictionary(); | |
2667 } | |
2668 | |
2669 | |
2670 void SystemDictionary::copy_buckets(char** top, char* end) { | |
2671 dictionary()->copy_buckets(top, end); | |
2672 } | |
2673 | |
2674 | |
2675 void SystemDictionary::copy_table(char** top, char* end) { | |
2676 dictionary()->copy_table(top, end); | |
2677 } | |
2678 | |
2679 | |
2680 void SystemDictionary::reverse() { | |
2681 dictionary()->reverse(); | |
2682 } | |
2683 | |
2684 int SystemDictionary::number_of_classes() { | |
2685 return dictionary()->number_of_entries(); | |
2686 } | |
2687 | |
2688 | |
2689 // ---------------------------------------------------------------------------- | |
2690 #ifndef PRODUCT | |
2691 | |
2692 void SystemDictionary::print() { | |
2693 dictionary()->print(); | |
2694 | |
2695 // Placeholders | |
2696 GCMutexLocker mu(SystemDictionary_lock); | |
2697 placeholders()->print(); | |
2698 | |
2699 // loader constraints - print under SD_lock | |
2700 constraints()->print(); | |
2701 } | |
2702 | |
2703 #endif | |
2704 | |
2705 void SystemDictionary::verify() { | |
2706 guarantee(dictionary() != NULL, "Verify of system dictionary failed"); | |
2707 guarantee(constraints() != NULL, | |
2708 "Verify of loader constraints failed"); | |
2709 guarantee(dictionary()->number_of_entries() >= 0 && | |
2710 placeholders()->number_of_entries() >= 0, | |
2711 "Verify of system dictionary failed"); | |
2712 | |
2713 // Verify dictionary | |
2714 dictionary()->verify(); | |
2715 | |
2716 GCMutexLocker mu(SystemDictionary_lock); | |
2717 placeholders()->verify(); | |
2718 | |
2719 // Verify constraint table | |
2720 guarantee(constraints() != NULL, "Verify of loader constraints failed"); | |
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2721 constraints()->verify(dictionary(), placeholders()); |
0 | 2722 } |
2723 | |
2724 | |
2725 void SystemDictionary::verify_obj_klass_present(Handle obj, | |
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2726 Symbol* class_name, |
0 | 2727 Handle class_loader) { |
2728 GCMutexLocker mu(SystemDictionary_lock); | |
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2729 Symbol* name; |
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2730 |
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2731 klassOop probe = find_class(class_name, class_loader); |
0 | 2732 if (probe == NULL) { |
2733 probe = SystemDictionary::find_shared_class(class_name); | |
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2734 if (probe == NULL) { |
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2735 name = find_placeholder(class_name, class_loader); |
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2736 } |
0 | 2737 } |
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2738 guarantee(probe != NULL || name != NULL, |
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2739 "Loaded klasses should be in SystemDictionary"); |
0 | 2740 } |
2741 | |
2742 #ifndef PRODUCT | |
2743 | |
2744 // statistics code | |
2745 class ClassStatistics: AllStatic { | |
2746 private: | |
2747 static int nclasses; // number of classes | |
2748 static int nmethods; // number of methods | |
2749 static int nmethoddata; // number of methodData | |
2750 static int class_size; // size of class objects in words | |
2751 static int method_size; // size of method objects in words | |
2752 static int debug_size; // size of debug info in methods | |
2753 static int methoddata_size; // size of methodData objects in words | |
2754 | |
2755 static void do_class(klassOop k) { | |
2756 nclasses++; | |
2757 class_size += k->size(); | |
2758 if (k->klass_part()->oop_is_instance()) { | |
2759 instanceKlass* ik = (instanceKlass*)k->klass_part(); | |
2760 class_size += ik->methods()->size(); | |
2761 class_size += ik->constants()->size(); | |
2762 class_size += ik->local_interfaces()->size(); | |
2763 class_size += ik->transitive_interfaces()->size(); | |
2764 // We do not have to count implementors, since we only store one! | |
3938 | 2765 class_size += ik->all_fields_count() * FieldInfo::field_slots; |
0 | 2766 } |
2767 } | |
2768 | |
2769 static void do_method(methodOop m) { | |
2770 nmethods++; | |
2771 method_size += m->size(); | |
2772 // class loader uses same objArray for empty vectors, so don't count these | |
2773 if (m->exception_table()->length() != 0) method_size += m->exception_table()->size(); | |
2774 if (m->has_stackmap_table()) { | |
2775 method_size += m->stackmap_data()->size(); | |
2776 } | |
2777 | |
2778 methodDataOop mdo = m->method_data(); | |
2779 if (mdo != NULL) { | |
2780 nmethoddata++; | |
2781 methoddata_size += mdo->size(); | |
2782 } | |
2783 } | |
2784 | |
2785 public: | |
2786 static void print() { | |
2787 SystemDictionary::classes_do(do_class); | |
2788 SystemDictionary::methods_do(do_method); | |
2789 tty->print_cr("Class statistics:"); | |
2790 tty->print_cr("%d classes (%d bytes)", nclasses, class_size * oopSize); | |
2791 tty->print_cr("%d methods (%d bytes = %d base + %d debug info)", nmethods, | |
2792 (method_size + debug_size) * oopSize, method_size * oopSize, debug_size * oopSize); | |
2793 tty->print_cr("%d methoddata (%d bytes)", nmethoddata, methoddata_size * oopSize); | |
2794 } | |
2795 }; | |
2796 | |
2797 | |
2798 int ClassStatistics::nclasses = 0; | |
2799 int ClassStatistics::nmethods = 0; | |
2800 int ClassStatistics::nmethoddata = 0; | |
2801 int ClassStatistics::class_size = 0; | |
2802 int ClassStatistics::method_size = 0; | |
2803 int ClassStatistics::debug_size = 0; | |
2804 int ClassStatistics::methoddata_size = 0; | |
2805 | |
2806 void SystemDictionary::print_class_statistics() { | |
2807 ResourceMark rm; | |
2808 ClassStatistics::print(); | |
2809 } | |
2810 | |
2811 | |
2812 class MethodStatistics: AllStatic { | |
2813 public: | |
2814 enum { | |
2815 max_parameter_size = 10 | |
2816 }; | |
2817 private: | |
2818 | |
2819 static int _number_of_methods; | |
2820 static int _number_of_final_methods; | |
2821 static int _number_of_static_methods; | |
2822 static int _number_of_native_methods; | |
2823 static int _number_of_synchronized_methods; | |
2824 static int _number_of_profiled_methods; | |
2825 static int _number_of_bytecodes; | |
2826 static int _parameter_size_profile[max_parameter_size]; | |
2827 static int _bytecodes_profile[Bytecodes::number_of_java_codes]; | |
2828 | |
2829 static void initialize() { | |
2830 _number_of_methods = 0; | |
2831 _number_of_final_methods = 0; | |
2832 _number_of_static_methods = 0; | |
2833 _number_of_native_methods = 0; | |
2834 _number_of_synchronized_methods = 0; | |
2835 _number_of_profiled_methods = 0; | |
2836 _number_of_bytecodes = 0; | |
2837 for (int i = 0; i < max_parameter_size ; i++) _parameter_size_profile[i] = 0; | |
2838 for (int j = 0; j < Bytecodes::number_of_java_codes; j++) _bytecodes_profile [j] = 0; | |
2839 }; | |
2840 | |
2841 static void do_method(methodOop m) { | |
2842 _number_of_methods++; | |
2843 // collect flag info | |
2844 if (m->is_final() ) _number_of_final_methods++; | |
2845 if (m->is_static() ) _number_of_static_methods++; | |
2846 if (m->is_native() ) _number_of_native_methods++; | |
2847 if (m->is_synchronized()) _number_of_synchronized_methods++; | |
2848 if (m->method_data() != NULL) _number_of_profiled_methods++; | |
2849 // collect parameter size info (add one for receiver, if any) | |
2850 _parameter_size_profile[MIN2(m->size_of_parameters() + (m->is_static() ? 0 : 1), max_parameter_size - 1)]++; | |
2851 // collect bytecodes info | |
2852 { | |
2853 Thread *thread = Thread::current(); | |
2854 HandleMark hm(thread); | |
2855 BytecodeStream s(methodHandle(thread, m)); | |
2856 Bytecodes::Code c; | |
2857 while ((c = s.next()) >= 0) { | |
2858 _number_of_bytecodes++; | |
2859 _bytecodes_profile[c]++; | |
2860 } | |
2861 } | |
2862 } | |
2863 | |
2864 public: | |
2865 static void print() { | |
2866 initialize(); | |
2867 SystemDictionary::methods_do(do_method); | |
2868 // generate output | |
2869 tty->cr(); | |
2870 tty->print_cr("Method statistics (static):"); | |
2871 // flag distribution | |
2872 tty->cr(); | |
2873 tty->print_cr("%6d final methods %6.1f%%", _number_of_final_methods , _number_of_final_methods * 100.0F / _number_of_methods); | |
2874 tty->print_cr("%6d static methods %6.1f%%", _number_of_static_methods , _number_of_static_methods * 100.0F / _number_of_methods); | |
2875 tty->print_cr("%6d native methods %6.1f%%", _number_of_native_methods , _number_of_native_methods * 100.0F / _number_of_methods); | |
2876 tty->print_cr("%6d synchronized methods %6.1f%%", _number_of_synchronized_methods, _number_of_synchronized_methods * 100.0F / _number_of_methods); | |
2877 tty->print_cr("%6d profiled methods %6.1f%%", _number_of_profiled_methods, _number_of_profiled_methods * 100.0F / _number_of_methods); | |
2878 // parameter size profile | |
2879 tty->cr(); | |
2880 { int tot = 0; | |
2881 int avg = 0; | |
2882 for (int i = 0; i < max_parameter_size; i++) { | |
2883 int n = _parameter_size_profile[i]; | |
2884 tot += n; | |
2885 avg += n*i; | |
2886 tty->print_cr("parameter size = %1d: %6d methods %5.1f%%", i, n, n * 100.0F / _number_of_methods); | |
2887 } | |
2888 assert(tot == _number_of_methods, "should be the same"); | |
2889 tty->print_cr(" %6d methods 100.0%%", _number_of_methods); | |
2890 tty->print_cr("(average parameter size = %3.1f including receiver, if any)", (float)avg / _number_of_methods); | |
2891 } | |
2892 // bytecodes profile | |
2893 tty->cr(); | |
2894 { int tot = 0; | |
2895 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) { | |
2896 if (Bytecodes::is_defined(i)) { | |
2897 Bytecodes::Code c = Bytecodes::cast(i); | |
2898 int n = _bytecodes_profile[c]; | |
2899 tot += n; | |
2900 tty->print_cr("%9d %7.3f%% %s", n, n * 100.0F / _number_of_bytecodes, Bytecodes::name(c)); | |
2901 } | |
2902 } | |
2903 assert(tot == _number_of_bytecodes, "should be the same"); | |
2904 tty->print_cr("%9d 100.000%%", _number_of_bytecodes); | |
2905 } | |
2906 tty->cr(); | |
2907 } | |
2908 }; | |
2909 | |
2910 int MethodStatistics::_number_of_methods; | |
2911 int MethodStatistics::_number_of_final_methods; | |
2912 int MethodStatistics::_number_of_static_methods; | |
2913 int MethodStatistics::_number_of_native_methods; | |
2914 int MethodStatistics::_number_of_synchronized_methods; | |
2915 int MethodStatistics::_number_of_profiled_methods; | |
2916 int MethodStatistics::_number_of_bytecodes; | |
2917 int MethodStatistics::_parameter_size_profile[MethodStatistics::max_parameter_size]; | |
2918 int MethodStatistics::_bytecodes_profile[Bytecodes::number_of_java_codes]; | |
2919 | |
2920 | |
2921 void SystemDictionary::print_method_statistics() { | |
2922 MethodStatistics::print(); | |
2923 } | |
2924 | |
2925 #endif // PRODUCT |