Mercurial > hg > truffle
annotate src/share/vm/classfile/systemDictionary.cpp @ 2236:de14f1eee390
6954420: 2/4 jps shows "process information unavailable" sometimes
Summary: Make sure the backing store file is flushed in create_sharedmem_resources() and get_user_name_slow() no longer checks the size of the backing store file.
Reviewed-by: briand, swamyv, acorn, poonam
author | dcubed |
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date | Tue, 15 Feb 2011 19:00:22 -0800 |
parents | 3582bf76420e |
children | d25d4ca69222 4f26f535a225 |
rev | line source |
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0 | 1 /* |
1903 | 2 * Copyright (c) 1997, 2010, 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 * | |
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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; | |
67 | |
68 oop SystemDictionary::_system_loader_lock_obj = NULL; | |
69 | |
132
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70 klassOop SystemDictionary::_well_known_klasses[SystemDictionary::WKID_LIMIT] |
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71 = { NULL /*, NULL...*/ }; |
0 | 72 |
73 klassOop SystemDictionary::_box_klasses[T_VOID+1] = { NULL /*, NULL...*/ }; | |
74 | |
75 oop SystemDictionary::_java_system_loader = NULL; | |
76 | |
77 bool SystemDictionary::_has_loadClassInternal = false; | |
78 bool SystemDictionary::_has_checkPackageAccess = false; | |
79 | |
80 // lazily initialized klass variables | |
81 volatile klassOop SystemDictionary::_abstract_ownable_synchronizer_klass = NULL; | |
82 | |
83 | |
84 // ---------------------------------------------------------------------------- | |
85 // Java-level SystemLoader | |
86 | |
87 oop SystemDictionary::java_system_loader() { | |
88 return _java_system_loader; | |
89 } | |
90 | |
91 void SystemDictionary::compute_java_system_loader(TRAPS) { | |
1142 | 92 KlassHandle system_klass(THREAD, WK_KLASS(ClassLoader_klass)); |
0 | 93 JavaValue result(T_OBJECT); |
94 JavaCalls::call_static(&result, | |
1142 | 95 KlassHandle(THREAD, WK_KLASS(ClassLoader_klass)), |
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96 vmSymbols::getSystemClassLoader_name(), |
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97 vmSymbols::void_classloader_signature(), |
0 | 98 CHECK); |
99 | |
100 _java_system_loader = (oop)result.get_jobject(); | |
101 } | |
102 | |
103 | |
104 // ---------------------------------------------------------------------------- | |
105 // debugging | |
106 | |
107 #ifdef ASSERT | |
108 | |
109 // return true if class_name contains no '.' (internal format is '/') | |
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110 bool SystemDictionary::is_internal_format(Symbol* class_name) { |
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111 if (class_name != NULL) { |
0 | 112 ResourceMark rm; |
113 char* name = class_name->as_C_string(); | |
114 return strchr(name, '.') == NULL; | |
115 } else { | |
116 return true; | |
117 } | |
118 } | |
119 | |
120 #endif | |
121 | |
122 // ---------------------------------------------------------------------------- | |
514 | 123 // Parallel class loading check |
124 | |
125 bool SystemDictionary::is_parallelCapable(Handle class_loader) { | |
126 if (UnsyncloadClass || class_loader.is_null()) return true; | |
127 if (AlwaysLockClassLoader) return false; | |
128 return java_lang_Class::parallelCapable(class_loader()); | |
129 } | |
130 // ---------------------------------------------------------------------------- | |
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131 // ParallelDefineClass flag does not apply to bootclass loader |
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132 bool SystemDictionary::is_parallelDefine(Handle class_loader) { |
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133 if (class_loader.is_null()) return false; |
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134 if (AllowParallelDefineClass && java_lang_Class::parallelCapable(class_loader())) { |
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135 return true; |
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136 } |
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137 return false; |
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138 } |
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139 // ---------------------------------------------------------------------------- |
0 | 140 // Resolving of classes |
141 | |
142 // Forwards to resolve_or_null | |
143 | |
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144 klassOop SystemDictionary::resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS) { |
0 | 145 klassOop klass = resolve_or_null(class_name, class_loader, protection_domain, THREAD); |
146 if (HAS_PENDING_EXCEPTION || klass == NULL) { | |
147 KlassHandle k_h(THREAD, klass); | |
148 // can return a null klass | |
149 klass = handle_resolution_exception(class_name, class_loader, protection_domain, throw_error, k_h, THREAD); | |
150 } | |
151 return klass; | |
152 } | |
153 | |
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154 klassOop SystemDictionary::handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS) { |
0 | 155 if (HAS_PENDING_EXCEPTION) { |
156 // If we have a pending exception we forward it to the caller, unless throw_error is true, | |
157 // in which case we have to check whether the pending exception is a ClassNotFoundException, | |
158 // and if so convert it to a NoClassDefFoundError | |
159 // And chain the original ClassNotFoundException | |
1142 | 160 if (throw_error && PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass())) { |
0 | 161 ResourceMark rm(THREAD); |
162 assert(klass_h() == NULL, "Should not have result with exception pending"); | |
163 Handle e(THREAD, PENDING_EXCEPTION); | |
164 CLEAR_PENDING_EXCEPTION; | |
165 THROW_MSG_CAUSE_0(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string(), e); | |
166 } else { | |
167 return NULL; | |
168 } | |
169 } | |
170 // Class not found, throw appropriate error or exception depending on value of throw_error | |
171 if (klass_h() == NULL) { | |
172 ResourceMark rm(THREAD); | |
173 if (throw_error) { | |
174 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string()); | |
175 } else { | |
176 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), class_name->as_C_string()); | |
177 } | |
178 } | |
179 return (klassOop)klass_h(); | |
180 } | |
181 | |
182 | |
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183 klassOop SystemDictionary::resolve_or_fail(Symbol* class_name, |
0 | 184 bool throw_error, TRAPS) |
185 { | |
186 return resolve_or_fail(class_name, Handle(), Handle(), throw_error, THREAD); | |
187 } | |
188 | |
189 | |
190 // Forwards to resolve_instance_class_or_null | |
191 | |
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192 klassOop SystemDictionary::resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS) { |
0 | 193 assert(!THREAD->is_Compiler_thread(), "Can not load classes with the Compiler thread"); |
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194 if (FieldType::is_array(class_name)) { |
0 | 195 return resolve_array_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); |
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196 } else if (FieldType::is_obj(class_name)) { |
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197 ResourceMark rm(THREAD); |
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198 // Ignore wrapping L and ;. |
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199 TempNewSymbol name = SymbolTable::new_symbol(class_name->as_C_string() + 1, |
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200 class_name->utf8_length() - 2, CHECK_NULL); |
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201 return resolve_instance_class_or_null(name, class_loader, protection_domain, CHECK_NULL); |
0 | 202 } else { |
203 return resolve_instance_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); | |
204 } | |
205 } | |
206 | |
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207 klassOop SystemDictionary::resolve_or_null(Symbol* class_name, TRAPS) { |
0 | 208 return resolve_or_null(class_name, Handle(), Handle(), THREAD); |
209 } | |
210 | |
211 // Forwards to resolve_instance_class_or_null | |
212 | |
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213 klassOop SystemDictionary::resolve_array_class_or_null(Symbol* class_name, |
0 | 214 Handle class_loader, |
215 Handle protection_domain, | |
216 TRAPS) { | |
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217 assert(FieldType::is_array(class_name), "must be array"); |
0 | 218 klassOop k = NULL; |
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219 FieldArrayInfo fd; |
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220 // dimension and object_key in FieldArrayInfo are assigned as a side-effect |
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221 // of this call |
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222 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_NULL); |
0 | 223 if (t == T_OBJECT) { |
224 // naked oop "k" is OK here -- we assign back into it | |
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225 k = SystemDictionary::resolve_instance_class_or_null(fd.object_key(), |
0 | 226 class_loader, |
227 protection_domain, | |
228 CHECK_NULL); | |
229 if (k != NULL) { | |
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230 k = Klass::cast(k)->array_klass(fd.dimension(), CHECK_NULL); |
0 | 231 } |
232 } else { | |
233 k = Universe::typeArrayKlassObj(t); | |
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234 k = typeArrayKlass::cast(k)->array_klass(fd.dimension(), CHECK_NULL); |
0 | 235 } |
236 return k; | |
237 } | |
238 | |
239 | |
240 // Must be called for any super-class or super-interface resolution | |
241 // during class definition to allow class circularity checking | |
242 // super-interface callers: | |
243 // parse_interfaces - for defineClass & jvmtiRedefineClasses | |
244 // super-class callers: | |
245 // ClassFileParser - for defineClass & jvmtiRedefineClasses | |
246 // load_shared_class - while loading a class from shared archive | |
514 | 247 // resolve_instance_class_or_null: |
248 // via: handle_parallel_super_load | |
0 | 249 // when resolving a class that has an existing placeholder with |
250 // a saved superclass [i.e. a defineClass is currently in progress] | |
251 // if another thread is trying to resolve the class, it must do | |
252 // super-class checks on its own thread to catch class circularity | |
253 // This last call is critical in class circularity checking for cases | |
254 // where classloading is delegated to different threads and the | |
255 // classloader lock is released. | |
256 // Take the case: Base->Super->Base | |
257 // 1. If thread T1 tries to do a defineClass of class Base | |
258 // resolve_super_or_fail creates placeholder: T1, Base (super Super) | |
259 // 2. resolve_instance_class_or_null does not find SD or placeholder for Super | |
260 // so it tries to load Super | |
261 // 3. If we load the class internally, or user classloader uses same thread | |
262 // loadClassFromxxx or defineClass via parseClassFile Super ... | |
263 // 3.1 resolve_super_or_fail creates placeholder: T1, Super (super Base) | |
264 // 3.3 resolve_instance_class_or_null Base, finds placeholder for Base | |
265 // 3.4 calls resolve_super_or_fail Base | |
266 // 3.5 finds T1,Base -> throws class circularity | |
267 //OR 4. If T2 tries to resolve Super via defineClass Super ... | |
268 // 4.1 resolve_super_or_fail creates placeholder: T2, Super (super Base) | |
269 // 4.2 resolve_instance_class_or_null Base, finds placeholder for Base (super Super) | |
270 // 4.3 calls resolve_super_or_fail Super in parallel on own thread T2 | |
271 // 4.4 finds T2, Super -> throws class circularity | |
272 // Must be called, even if superclass is null, since this is | |
273 // where the placeholder entry is created which claims this | |
274 // thread is loading this class/classloader. | |
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275 klassOop SystemDictionary::resolve_super_or_fail(Symbol* child_name, |
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276 Symbol* class_name, |
0 | 277 Handle class_loader, |
278 Handle protection_domain, | |
279 bool is_superclass, | |
280 TRAPS) { | |
281 | |
132
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282 // Try to get one of the well-known klasses. |
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283 // They are trusted, and do not participate in circularities. |
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284 if (LinkWellKnownClasses) { |
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285 klassOop k = find_well_known_klass(class_name); |
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286 if (k != NULL) { |
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287 return k; |
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288 } |
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289 } |
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290 |
0 | 291 // Double-check, if child class is already loaded, just return super-class,interface |
292 // Don't add a placedholder if already loaded, i.e. already in system dictionary | |
293 // Make sure there's a placeholder for the *child* before resolving. | |
294 // Used as a claim that this thread is currently loading superclass/classloader | |
295 // Used here for ClassCircularity checks and also for heap verification | |
296 // (every instanceKlass in the heap needs to be in the system dictionary | |
297 // or have a placeholder). | |
298 // Must check ClassCircularity before checking if super class is already loaded | |
299 // | |
300 // We might not already have a placeholder if this child_name was | |
301 // first seen via resolve_from_stream (jni_DefineClass or JVM_DefineClass); | |
302 // the name of the class might not be known until the stream is actually | |
303 // parsed. | |
304 // Bugs 4643874, 4715493 | |
305 // compute_hash can have a safepoint | |
306 | |
307 unsigned int d_hash = dictionary()->compute_hash(child_name, class_loader); | |
308 int d_index = dictionary()->hash_to_index(d_hash); | |
309 unsigned int p_hash = placeholders()->compute_hash(child_name, class_loader); | |
310 int p_index = placeholders()->hash_to_index(p_hash); | |
311 // can't throw error holding a lock | |
312 bool child_already_loaded = false; | |
313 bool throw_circularity_error = false; | |
314 { | |
315 MutexLocker mu(SystemDictionary_lock, THREAD); | |
316 klassOop childk = find_class(d_index, d_hash, child_name, class_loader); | |
317 klassOop quicksuperk; | |
318 // to support // loading: if child done loading, just return superclass | |
319 // if class_name, & class_loader don't match: | |
320 // if initial define, SD update will give LinkageError | |
321 // if redefine: compare_class_versions will give HIERARCHY_CHANGED | |
322 // so we don't throw an exception here. | |
323 // see: nsk redefclass014 & java.lang.instrument Instrument032 | |
324 if ((childk != NULL ) && (is_superclass) && | |
325 ((quicksuperk = instanceKlass::cast(childk)->super()) != NULL) && | |
326 | |
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327 ((Klass::cast(quicksuperk)->name() == class_name) && |
0 | 328 (Klass::cast(quicksuperk)->class_loader() == class_loader()))) { |
329 return quicksuperk; | |
330 } else { | |
331 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, class_loader); | |
332 if (probe && probe->check_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER)) { | |
333 throw_circularity_error = true; | |
334 } | |
514 | 335 } |
336 if (!throw_circularity_error) { | |
0 | 337 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, child_name, class_loader, PlaceholderTable::LOAD_SUPER, class_name, THREAD); |
338 } | |
339 } | |
340 if (throw_circularity_error) { | |
341 ResourceMark rm(THREAD); | |
342 THROW_MSG_0(vmSymbols::java_lang_ClassCircularityError(), child_name->as_C_string()); | |
343 } | |
344 | |
345 // java.lang.Object should have been found above | |
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346 assert(class_name != NULL, "null super class for resolving"); |
0 | 347 // Resolve the super class or interface, check results on return |
348 klassOop superk = NULL; | |
349 superk = SystemDictionary::resolve_or_null(class_name, | |
350 class_loader, | |
351 protection_domain, | |
352 THREAD); | |
353 | |
354 KlassHandle superk_h(THREAD, superk); | |
355 | |
356 // Note: clean up of placeholders currently in callers of | |
357 // resolve_super_or_fail - either at update_dictionary time | |
358 // or on error | |
359 { | |
360 MutexLocker mu(SystemDictionary_lock, THREAD); | |
361 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, class_loader); | |
362 if (probe != NULL) { | |
363 probe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER); | |
364 } | |
365 } | |
366 if (HAS_PENDING_EXCEPTION || superk_h() == NULL) { | |
367 // can null superk | |
368 superk_h = KlassHandle(THREAD, handle_resolution_exception(class_name, class_loader, protection_domain, true, superk_h, THREAD)); | |
369 } | |
370 | |
371 return superk_h(); | |
372 } | |
373 | |
374 void SystemDictionary::validate_protection_domain(instanceKlassHandle klass, | |
375 Handle class_loader, | |
376 Handle protection_domain, | |
377 TRAPS) { | |
378 if(!has_checkPackageAccess()) return; | |
379 | |
380 // Now we have to call back to java to check if the initating class has access | |
381 JavaValue result(T_VOID); | |
382 if (TraceProtectionDomainVerification) { | |
383 // Print out trace information | |
384 tty->print_cr("Checking package access"); | |
385 tty->print(" - class loader: "); class_loader()->print_value_on(tty); tty->cr(); | |
386 tty->print(" - protection domain: "); protection_domain()->print_value_on(tty); tty->cr(); | |
387 tty->print(" - loading: "); klass()->print_value_on(tty); tty->cr(); | |
388 } | |
389 | |
390 assert(class_loader() != NULL, "should not have non-null protection domain for null classloader"); | |
391 | |
1142 | 392 KlassHandle system_loader(THREAD, SystemDictionary::ClassLoader_klass()); |
0 | 393 JavaCalls::call_special(&result, |
394 class_loader, | |
395 system_loader, | |
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396 vmSymbols::checkPackageAccess_name(), |
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397 vmSymbols::class_protectiondomain_signature(), |
0 | 398 Handle(THREAD, klass->java_mirror()), |
399 protection_domain, | |
400 THREAD); | |
401 | |
402 if (TraceProtectionDomainVerification) { | |
403 if (HAS_PENDING_EXCEPTION) { | |
404 tty->print_cr(" -> DENIED !!!!!!!!!!!!!!!!!!!!!"); | |
405 } else { | |
406 tty->print_cr(" -> granted"); | |
407 } | |
408 tty->cr(); | |
409 } | |
410 | |
411 if (HAS_PENDING_EXCEPTION) return; | |
412 | |
413 // If no exception has been thrown, we have validated the protection domain | |
414 // Insert the protection domain of the initiating class into the set. | |
415 { | |
416 // We recalculate the entry here -- we've called out to java since | |
417 // the last time it was calculated. | |
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418 Symbol* kn = klass->name(); |
0 | 419 unsigned int d_hash = dictionary()->compute_hash(kn, class_loader); |
420 int d_index = dictionary()->hash_to_index(d_hash); | |
421 | |
422 MutexLocker mu(SystemDictionary_lock, THREAD); | |
423 { | |
424 // Note that we have an entry, and entries can be deleted only during GC, | |
425 // so we cannot allow GC to occur while we're holding this entry. | |
426 | |
427 // We're using a No_Safepoint_Verifier to catch any place where we | |
428 // might potentially do a GC at all. | |
429 // SystemDictionary::do_unloading() asserts that classes are only | |
430 // unloaded at a safepoint. | |
431 No_Safepoint_Verifier nosafepoint; | |
432 dictionary()->add_protection_domain(d_index, d_hash, klass, class_loader, | |
433 protection_domain, THREAD); | |
434 } | |
435 } | |
436 } | |
437 | |
438 // We only get here if this thread finds that another thread | |
439 // has already claimed the placeholder token for the current operation, | |
440 // but that other thread either never owned or gave up the | |
441 // object lock | |
442 // Waits on SystemDictionary_lock to indicate placeholder table updated | |
443 // On return, caller must recheck placeholder table state | |
444 // | |
445 // We only get here if | |
446 // 1) custom classLoader, i.e. not bootstrap classloader | |
447 // 2) UnsyncloadClass not set | |
448 // 3) custom classLoader has broken the class loader objectLock | |
449 // so another thread got here in parallel | |
450 // | |
451 // lockObject must be held. | |
452 // Complicated dance due to lock ordering: | |
453 // Must first release the classloader object lock to | |
454 // allow initial definer to complete the class definition | |
455 // and to avoid deadlock | |
456 // Reclaim classloader lock object with same original recursion count | |
457 // Must release SystemDictionary_lock after notify, since | |
458 // class loader lock must be claimed before SystemDictionary_lock | |
459 // to prevent deadlocks | |
460 // | |
461 // The notify allows applications that did an untimed wait() on | |
462 // the classloader object lock to not hang. | |
463 void SystemDictionary::double_lock_wait(Handle lockObject, TRAPS) { | |
464 assert_lock_strong(SystemDictionary_lock); | |
465 | |
466 bool calledholdinglock | |
467 = ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, lockObject); | |
468 assert(calledholdinglock,"must hold lock for notify"); | |
514 | 469 assert((!(lockObject() == _system_loader_lock_obj) && !is_parallelCapable(lockObject)), "unexpected double_lock_wait"); |
0 | 470 ObjectSynchronizer::notifyall(lockObject, THREAD); |
471 intptr_t recursions = ObjectSynchronizer::complete_exit(lockObject, THREAD); | |
472 SystemDictionary_lock->wait(); | |
473 SystemDictionary_lock->unlock(); | |
474 ObjectSynchronizer::reenter(lockObject, recursions, THREAD); | |
475 SystemDictionary_lock->lock(); | |
476 } | |
477 | |
478 // If the class in is in the placeholder table, class loading is in progress | |
479 // For cases where the application changes threads to load classes, it | |
480 // is critical to ClassCircularity detection that we try loading | |
481 // the superclass on the same thread internally, so we do parallel | |
482 // super class loading here. | |
483 // This also is critical in cases where the original thread gets stalled | |
484 // even in non-circularity situations. | |
485 // Note: only one thread can define the class, but multiple can resolve | |
486 // Note: must call resolve_super_or_fail even if null super - | |
514 | 487 // to force placeholder entry creation for this class for circularity detection |
0 | 488 // Caller must check for pending exception |
489 // Returns non-null klassOop if other thread has completed load | |
490 // and we are done, | |
491 // If return null klassOop and no pending exception, the caller must load the class | |
492 instanceKlassHandle SystemDictionary::handle_parallel_super_load( | |
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493 Symbol* name, Symbol* superclassname, Handle class_loader, |
0 | 494 Handle protection_domain, Handle lockObject, TRAPS) { |
495 | |
496 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
497 unsigned int d_hash = dictionary()->compute_hash(name, class_loader); | |
498 int d_index = dictionary()->hash_to_index(d_hash); | |
499 unsigned int p_hash = placeholders()->compute_hash(name, class_loader); | |
500 int p_index = placeholders()->hash_to_index(p_hash); | |
501 | |
502 // superk is not used, resolve_super called for circularity check only | |
503 // This code is reached in two situations. One if this thread | |
504 // is loading the same class twice (e.g. ClassCircularity, or | |
505 // java.lang.instrument). | |
506 // The second is if another thread started the resolve_super first | |
507 // and has not yet finished. | |
508 // In both cases the original caller will clean up the placeholder | |
509 // entry on error. | |
510 klassOop superk = SystemDictionary::resolve_super_or_fail(name, | |
511 superclassname, | |
512 class_loader, | |
513 protection_domain, | |
514 true, | |
515 CHECK_(nh)); | |
516 // We don't redefine the class, so we just need to clean up if there | |
517 // was not an error (don't want to modify any system dictionary | |
518 // data structures). | |
519 { | |
520 MutexLocker mu(SystemDictionary_lock, THREAD); | |
521 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
522 SystemDictionary_lock->notify_all(); | |
523 } | |
524 | |
514 | 525 // parallelCapable class loaders do NOT wait for parallel superclass loads to complete |
526 // Serial class loaders and bootstrap classloader do wait for superclass loads | |
527 if (!class_loader.is_null() && is_parallelCapable(class_loader)) { | |
0 | 528 MutexLocker mu(SystemDictionary_lock, THREAD); |
529 // Check if classloading completed while we were loading superclass or waiting | |
530 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
531 if (check != NULL) { | |
532 // Klass is already loaded, so just return it | |
533 return(instanceKlassHandle(THREAD, check)); | |
534 } else { | |
535 return nh; | |
536 } | |
537 } | |
538 | |
539 // must loop to both handle other placeholder updates | |
540 // and spurious notifications | |
541 bool super_load_in_progress = true; | |
542 PlaceholderEntry* placeholder; | |
543 while (super_load_in_progress) { | |
544 MutexLocker mu(SystemDictionary_lock, THREAD); | |
545 // Check if classloading completed while we were loading superclass or waiting | |
546 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
547 if (check != NULL) { | |
548 // Klass is already loaded, so just return it | |
549 return(instanceKlassHandle(THREAD, check)); | |
550 } else { | |
551 placeholder = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
552 if (placeholder && placeholder->super_load_in_progress() ){ | |
553 // Before UnsyncloadClass: | |
554 // We only get here if the application has released the | |
555 // classloader lock when another thread was in the middle of loading a | |
556 // superclass/superinterface for this class, and now | |
557 // this thread is also trying to load this class. | |
558 // To minimize surprises, the first thread that started to | |
559 // load a class should be the one to complete the loading | |
560 // with the classfile it initially expected. | |
561 // This logic has the current thread wait once it has done | |
562 // all the superclass/superinterface loading it can, until | |
563 // the original thread completes the class loading or fails | |
564 // If it completes we will use the resulting instanceKlass | |
565 // which we will find below in the systemDictionary. | |
566 // We also get here for parallel bootstrap classloader | |
567 if (class_loader.is_null()) { | |
568 SystemDictionary_lock->wait(); | |
569 } else { | |
570 double_lock_wait(lockObject, THREAD); | |
571 } | |
572 } else { | |
573 // If not in SD and not in PH, other thread's load must have failed | |
574 super_load_in_progress = false; | |
575 } | |
576 } | |
577 } | |
578 return (nh); | |
579 } | |
580 | |
581 | |
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582 klassOop SystemDictionary::resolve_instance_class_or_null(Symbol* name, Handle class_loader, Handle protection_domain, TRAPS) { |
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583 assert(name != NULL && !FieldType::is_array(name) && |
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584 !FieldType::is_obj(name), "invalid class name"); |
0 | 585 |
586 // UseNewReflection | |
587 // Fix for 4474172; see evaluation for more details | |
588 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); | |
589 | |
590 // Do lookup to see if class already exist and the protection domain | |
591 // has the right access | |
592 unsigned int d_hash = dictionary()->compute_hash(name, class_loader); | |
593 int d_index = dictionary()->hash_to_index(d_hash); | |
594 klassOop probe = dictionary()->find(d_index, d_hash, name, class_loader, | |
595 protection_domain, THREAD); | |
596 if (probe != NULL) return probe; | |
597 | |
598 | |
599 // Non-bootstrap class loaders will call out to class loader and | |
600 // define via jvm/jni_DefineClass which will acquire the | |
601 // class loader object lock to protect against multiple threads | |
602 // defining the class in parallel by accident. | |
603 // This lock must be acquired here so the waiter will find | |
604 // any successful result in the SystemDictionary and not attempt | |
605 // the define | |
514 | 606 // ParallelCapable Classloaders and the bootstrap classloader, |
0 | 607 // or all classloaders with UnsyncloadClass do not acquire lock here |
608 bool DoObjectLock = true; | |
514 | 609 if (is_parallelCapable(class_loader)) { |
0 | 610 DoObjectLock = false; |
611 } | |
612 | |
613 unsigned int p_hash = placeholders()->compute_hash(name, class_loader); | |
614 int p_index = placeholders()->hash_to_index(p_hash); | |
615 | |
616 // Class is not in SystemDictionary so we have to do loading. | |
617 // Make sure we are synchronized on the class loader before we proceed | |
618 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
619 check_loader_lock_contention(lockObject, THREAD); | |
620 ObjectLocker ol(lockObject, THREAD, DoObjectLock); | |
621 | |
622 // Check again (after locking) if class already exist in SystemDictionary | |
623 bool class_has_been_loaded = false; | |
624 bool super_load_in_progress = false; | |
625 bool havesupername = false; | |
626 instanceKlassHandle k; | |
627 PlaceholderEntry* placeholder; | |
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628 Symbol* superclassname = NULL; |
0 | 629 |
630 { | |
631 MutexLocker mu(SystemDictionary_lock, THREAD); | |
632 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
633 if (check != NULL) { | |
634 // Klass is already loaded, so just return it | |
635 class_has_been_loaded = true; | |
636 k = instanceKlassHandle(THREAD, check); | |
637 } else { | |
638 placeholder = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
639 if (placeholder && placeholder->super_load_in_progress()) { | |
640 super_load_in_progress = true; | |
641 if (placeholder->havesupername() == true) { | |
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642 superclassname = placeholder->supername(); |
0 | 643 havesupername = true; |
644 } | |
645 } | |
646 } | |
647 } | |
648 | |
649 // If the class in is in the placeholder table, class loading is in progress | |
650 if (super_load_in_progress && havesupername==true) { | |
651 k = SystemDictionary::handle_parallel_super_load(name, superclassname, | |
652 class_loader, protection_domain, lockObject, THREAD); | |
653 if (HAS_PENDING_EXCEPTION) { | |
654 return NULL; | |
655 } | |
656 if (!k.is_null()) { | |
657 class_has_been_loaded = true; | |
658 } | |
659 } | |
660 | |
661 if (!class_has_been_loaded) { | |
662 | |
663 // add placeholder entry to record loading instance class | |
664 // Five cases: | |
665 // All cases need to prevent modifying bootclasssearchpath | |
666 // in parallel with a classload of same classname | |
514 | 667 // Redefineclasses uses existence of the placeholder for the duration |
668 // of the class load to prevent concurrent redefinition of not completely | |
669 // defined classes. | |
0 | 670 // case 1. traditional classloaders that rely on the classloader object lock |
671 // - no other need for LOAD_INSTANCE | |
672 // case 2. traditional classloaders that break the classloader object lock | |
673 // as a deadlock workaround. Detection of this case requires that | |
674 // this check is done while holding the classloader object lock, | |
675 // and that lock is still held when calling classloader's loadClass. | |
676 // For these classloaders, we ensure that the first requestor | |
677 // completes the load and other requestors wait for completion. | |
678 // case 3. UnsyncloadClass - don't use objectLocker | |
679 // With this flag, we allow parallel classloading of a | |
680 // class/classloader pair | |
681 // case4. Bootstrap classloader - don't own objectLocker | |
682 // This classloader supports parallelism at the classloader level, | |
683 // but only allows a single load of a class/classloader pair. | |
684 // No performance benefit and no deadlock issues. | |
514 | 685 // case 5. parallelCapable user level classloaders - without objectLocker |
686 // Allow parallel classloading of a class/classloader pair | |
0 | 687 bool throw_circularity_error = false; |
688 { | |
689 MutexLocker mu(SystemDictionary_lock, THREAD); | |
514 | 690 if (class_loader.is_null() || !is_parallelCapable(class_loader)) { |
0 | 691 PlaceholderEntry* oldprobe = placeholders()->get_entry(p_index, p_hash, name, class_loader); |
692 if (oldprobe) { | |
693 // only need check_seen_thread once, not on each loop | |
694 // 6341374 java/lang/Instrument with -Xcomp | |
695 if (oldprobe->check_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE)) { | |
696 throw_circularity_error = true; | |
697 } else { | |
698 // case 1: traditional: should never see load_in_progress. | |
699 while (!class_has_been_loaded && oldprobe && oldprobe->instance_load_in_progress()) { | |
700 | |
701 // case 4: bootstrap classloader: prevent futile classloading, | |
702 // wait on first requestor | |
703 if (class_loader.is_null()) { | |
704 SystemDictionary_lock->wait(); | |
705 } else { | |
706 // case 2: traditional with broken classloader lock. wait on first | |
707 // requestor. | |
708 double_lock_wait(lockObject, THREAD); | |
709 } | |
710 // Check if classloading completed while we were waiting | |
711 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
712 if (check != NULL) { | |
713 // Klass is already loaded, so just return it | |
714 k = instanceKlassHandle(THREAD, check); | |
715 class_has_been_loaded = true; | |
716 } | |
717 // check if other thread failed to load and cleaned up | |
718 oldprobe = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
719 } | |
720 } | |
721 } | |
722 } | |
723 // All cases: add LOAD_INSTANCE | |
514 | 724 // case 3: UnsyncloadClass || case 5: parallelCapable: allow competing threads to try |
0 | 725 // LOAD_INSTANCE in parallel |
726 // add placeholder entry even if error - callers will remove on error | |
514 | 727 if (!throw_circularity_error && !class_has_been_loaded) { |
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728 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, name, class_loader, PlaceholderTable::LOAD_INSTANCE, NULL, THREAD); |
0 | 729 // For class loaders that do not acquire the classloader object lock, |
730 // if they did not catch another thread holding LOAD_INSTANCE, | |
731 // need a check analogous to the acquire ObjectLocker/find_class | |
732 // i.e. now that we hold the LOAD_INSTANCE token on loading this class/CL | |
733 // one final check if the load has already completed | |
514 | 734 // class loaders holding the ObjectLock shouldn't find the class here |
0 | 735 klassOop check = find_class(d_index, d_hash, name, class_loader); |
736 if (check != NULL) { | |
737 // Klass is already loaded, so just return it | |
738 k = instanceKlassHandle(THREAD, check); | |
739 class_has_been_loaded = true; | |
740 newprobe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE); | |
514 | 741 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); |
742 SystemDictionary_lock->notify_all(); | |
0 | 743 } |
744 } | |
745 } | |
746 // must throw error outside of owning lock | |
747 if (throw_circularity_error) { | |
748 ResourceMark rm(THREAD); | |
749 THROW_MSG_0(vmSymbols::java_lang_ClassCircularityError(), name->as_C_string()); | |
750 } | |
751 | |
752 if (!class_has_been_loaded) { | |
753 | |
754 // Do actual loading | |
755 k = load_instance_class(name, class_loader, THREAD); | |
756 | |
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757 // For UnsyncloadClass only |
0 | 758 // If they got a linkageError, check if a parallel class load succeeded. |
759 // If it did, then for bytecode resolution the specification requires | |
760 // that we return the same result we did for the other thread, i.e. the | |
761 // successfully loaded instanceKlass | |
762 // Should not get here for classloaders that support parallelism | |
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763 // with the new cleaner mechanism, even with AllowParallelDefineClass |
514 | 764 // Bootstrap goes through here to allow for an extra guarantee check |
0 | 765 if (UnsyncloadClass || (class_loader.is_null())) { |
766 if (k.is_null() && HAS_PENDING_EXCEPTION | |
1142 | 767 && PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { |
0 | 768 MutexLocker mu(SystemDictionary_lock, THREAD); |
769 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
770 if (check != NULL) { | |
771 // Klass is already loaded, so just use it | |
772 k = instanceKlassHandle(THREAD, check); | |
773 CLEAR_PENDING_EXCEPTION; | |
774 guarantee((!class_loader.is_null()), "dup definition for bootstrap loader?"); | |
775 } | |
776 } | |
777 } | |
778 | |
779 // clean up placeholder entries for success or error | |
780 // This cleans up LOAD_INSTANCE entries | |
781 // It also cleans up LOAD_SUPER entries on errors from | |
782 // calling load_instance_class | |
783 { | |
784 MutexLocker mu(SystemDictionary_lock, THREAD); | |
785 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
786 if (probe != NULL) { | |
787 probe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE); | |
788 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
789 SystemDictionary_lock->notify_all(); | |
790 } | |
791 } | |
792 | |
793 // If everything was OK (no exceptions, no null return value), and | |
794 // class_loader is NOT the defining loader, do a little more bookkeeping. | |
795 if (!HAS_PENDING_EXCEPTION && !k.is_null() && | |
796 k->class_loader() != class_loader()) { | |
797 | |
798 check_constraints(d_index, d_hash, k, class_loader, false, THREAD); | |
799 | |
800 // Need to check for a PENDING_EXCEPTION again; check_constraints | |
801 // can throw and doesn't use the CHECK macro. | |
802 if (!HAS_PENDING_EXCEPTION) { | |
803 { // Grabbing the Compile_lock prevents systemDictionary updates | |
804 // during compilations. | |
805 MutexLocker mu(Compile_lock, THREAD); | |
806 update_dictionary(d_index, d_hash, p_index, p_hash, | |
807 k, class_loader, THREAD); | |
808 } | |
809 if (JvmtiExport::should_post_class_load()) { | |
810 Thread *thread = THREAD; | |
811 assert(thread->is_Java_thread(), "thread->is_Java_thread()"); | |
812 JvmtiExport::post_class_load((JavaThread *) thread, k()); | |
813 } | |
814 } | |
815 } | |
816 if (HAS_PENDING_EXCEPTION || k.is_null()) { | |
817 // On error, clean up placeholders | |
818 { | |
819 MutexLocker mu(SystemDictionary_lock, THREAD); | |
820 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
821 SystemDictionary_lock->notify_all(); | |
822 } | |
823 return NULL; | |
824 } | |
825 } | |
826 } | |
827 | |
828 #ifdef ASSERT | |
829 { | |
830 Handle loader (THREAD, k->class_loader()); | |
831 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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832 oop kk = find_class(name, loader); |
0 | 833 assert(kk == k(), "should be present in dictionary"); |
834 } | |
835 #endif | |
836 | |
837 // return if the protection domain in NULL | |
838 if (protection_domain() == NULL) return k(); | |
839 | |
840 // Check the protection domain has the right access | |
841 { | |
842 MutexLocker mu(SystemDictionary_lock, THREAD); | |
843 // Note that we have an entry, and entries can be deleted only during GC, | |
844 // so we cannot allow GC to occur while we're holding this entry. | |
845 // We're using a No_Safepoint_Verifier to catch any place where we | |
846 // might potentially do a GC at all. | |
847 // SystemDictionary::do_unloading() asserts that classes are only | |
848 // unloaded at a safepoint. | |
849 No_Safepoint_Verifier nosafepoint; | |
850 if (dictionary()->is_valid_protection_domain(d_index, d_hash, name, | |
851 class_loader, | |
852 protection_domain)) { | |
853 return k(); | |
854 } | |
855 } | |
856 | |
857 // Verify protection domain. If it fails an exception is thrown | |
858 validate_protection_domain(k, class_loader, protection_domain, CHECK_(klassOop(NULL))); | |
859 | |
860 return k(); | |
861 } | |
862 | |
863 | |
864 // This routine does not lock the system dictionary. | |
865 // | |
866 // Since readers don't hold a lock, we must make sure that system | |
867 // dictionary entries are only removed at a safepoint (when only one | |
868 // thread is running), and are added to in a safe way (all links must | |
869 // be updated in an MT-safe manner). | |
870 // | |
871 // Callers should be aware that an entry could be added just after | |
872 // _dictionary->bucket(index) is read here, so the caller will not see | |
873 // the new entry. | |
874 | |
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875 klassOop SystemDictionary::find(Symbol* class_name, |
0 | 876 Handle class_loader, |
877 Handle protection_domain, | |
878 TRAPS) { | |
879 | |
556
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880 // UseNewReflection |
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881 // The result of this call should be consistent with the result |
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882 // of the call to resolve_instance_class_or_null(). |
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883 // See evaluation 6790209 and 4474172 for more details. |
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884 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); |
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885 |
0 | 886 unsigned int d_hash = dictionary()->compute_hash(class_name, class_loader); |
887 int d_index = dictionary()->hash_to_index(d_hash); | |
888 | |
889 { | |
890 // Note that we have an entry, and entries can be deleted only during GC, | |
891 // so we cannot allow GC to occur while we're holding this entry. | |
892 // We're using a No_Safepoint_Verifier to catch any place where we | |
893 // might potentially do a GC at all. | |
894 // SystemDictionary::do_unloading() asserts that classes are only | |
895 // unloaded at a safepoint. | |
896 No_Safepoint_Verifier nosafepoint; | |
897 return dictionary()->find(d_index, d_hash, class_name, class_loader, | |
898 protection_domain, THREAD); | |
899 } | |
900 } | |
901 | |
902 | |
903 // Look for a loaded instance or array klass by name. Do not do any loading. | |
904 // return NULL in case of error. | |
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905 klassOop SystemDictionary::find_instance_or_array_klass(Symbol* class_name, |
0 | 906 Handle class_loader, |
907 Handle protection_domain, | |
908 TRAPS) { | |
909 klassOop k = NULL; | |
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910 assert(class_name != NULL, "class name must be non NULL"); |
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911 |
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912 // Try to get one of the well-known klasses. |
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913 if (LinkWellKnownClasses) { |
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914 k = find_well_known_klass(class_name); |
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915 if (k != NULL) { |
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916 return k; |
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917 } |
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918 } |
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919 |
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920 if (FieldType::is_array(class_name)) { |
0 | 921 // The name refers to an array. Parse the name. |
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922 // dimension and object_key in FieldArrayInfo are assigned as a |
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923 // side-effect of this call |
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924 FieldArrayInfo fd; |
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925 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
0 | 926 if (t != T_OBJECT) { |
927 k = Universe::typeArrayKlassObj(t); | |
928 } else { | |
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929 k = SystemDictionary::find(fd.object_key(), class_loader, protection_domain, THREAD); |
0 | 930 } |
931 if (k != NULL) { | |
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932 k = Klass::cast(k)->array_klass_or_null(fd.dimension()); |
0 | 933 } |
934 } else { | |
935 k = find(class_name, class_loader, protection_domain, THREAD); | |
936 } | |
937 return k; | |
938 } | |
939 | |
132
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940 // Quick range check for names of well-known classes: |
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941 static Symbol* wk_klass_name_limits[2] = {NULL, NULL}; |
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942 |
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943 #ifndef PRODUCT |
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944 static int find_wkk_calls, find_wkk_probes, find_wkk_wins; |
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945 // counts for "hello world": 3983, 1616, 1075 |
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946 // => 60% hit after limit guard, 25% total win rate |
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947 #endif |
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948 |
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949 klassOop SystemDictionary::find_well_known_klass(Symbol* class_name) { |
132
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950 // A bounds-check on class_name will quickly get a negative result. |
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951 NOT_PRODUCT(find_wkk_calls++); |
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952 if (class_name >= wk_klass_name_limits[0] && |
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953 class_name <= wk_klass_name_limits[1]) { |
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954 NOT_PRODUCT(find_wkk_probes++); |
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955 vmSymbols::SID sid = vmSymbols::find_sid(class_name); |
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956 if (sid != vmSymbols::NO_SID) { |
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957 klassOop k = NULL; |
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958 switch (sid) { |
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959 #define WK_KLASS_CASE(name, symbol, ignore_option) \ |
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960 case vmSymbols::VM_SYMBOL_ENUM_NAME(symbol): \ |
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961 k = WK_KLASS(name); break; |
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962 WK_KLASSES_DO(WK_KLASS_CASE) |
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963 #undef WK_KLASS_CASE |
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964 } |
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965 NOT_PRODUCT(if (k != NULL) find_wkk_wins++); |
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966 return k; |
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967 } |
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968 } |
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969 return NULL; |
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970 } |
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971 |
0 | 972 // Note: this method is much like resolve_from_stream, but |
973 // updates no supplemental data structures. | |
974 // TODO consolidate the two methods with a helper routine? | |
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975 klassOop SystemDictionary::parse_stream(Symbol* class_name, |
0 | 976 Handle class_loader, |
977 Handle protection_domain, | |
978 ClassFileStream* st, | |
431
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979 KlassHandle host_klass, |
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980 GrowableArray<Handle>* cp_patches, |
0 | 981 TRAPS) { |
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982 TempNewSymbol parsed_name = NULL; |
0 | 983 |
984 // Parse the stream. Note that we do this even though this klass might | |
985 // already be present in the SystemDictionary, otherwise we would not | |
986 // throw potential ClassFormatErrors. | |
987 // | |
988 // Note: "name" is updated. | |
989 // Further note: a placeholder will be added for this class when | |
990 // super classes are loaded (resolve_super_or_fail). We expect this | |
991 // to be called for all classes but java.lang.Object; and we preload | |
992 // java.lang.Object through resolve_or_fail, not this path. | |
993 | |
994 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
995 class_loader, | |
996 protection_domain, | |
710 | 997 host_klass, |
998 cp_patches, | |
0 | 999 parsed_name, |
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1000 true, |
0 | 1001 THREAD); |
1002 | |
1003 // We don't redefine the class, so we just need to clean up whether there | |
1004 // was an error or not (don't want to modify any system dictionary | |
1005 // data structures). | |
1006 // Parsed name could be null if we threw an error before we got far | |
1007 // enough along to parse it -- in that case, there is nothing to clean up. | |
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1008 if (parsed_name != NULL) { |
0 | 1009 unsigned int p_hash = placeholders()->compute_hash(parsed_name, |
1010 class_loader); | |
1011 int p_index = placeholders()->hash_to_index(p_hash); | |
1012 { | |
1013 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1014 placeholders()->find_and_remove(p_index, p_hash, parsed_name, class_loader, THREAD); | |
1015 SystemDictionary_lock->notify_all(); | |
1016 } | |
1017 } | |
1018 | |
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1019 if (host_klass.not_null() && k.not_null()) { |
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1020 assert(AnonymousClasses, ""); |
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1021 // If it's anonymous, initialize it now, since nobody else will. |
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1022 k->set_host_klass(host_klass()); |
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1023 |
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1024 { |
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1025 MutexLocker mu_r(Compile_lock, THREAD); |
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1026 |
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1027 // Add to class hierarchy, initialize vtables, and do possible |
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1028 // deoptimizations. |
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1029 add_to_hierarchy(k, CHECK_NULL); // No exception, but can block |
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1030 |
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1031 // But, do not add to system dictionary. |
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1032 } |
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1033 |
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1034 k->eager_initialize(THREAD); |
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1035 |
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1036 // notify jvmti |
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1037 if (JvmtiExport::should_post_class_load()) { |
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1038 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); |
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1039 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); |
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1040 } |
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1041 } |
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1042 |
0 | 1043 return k(); |
1044 } | |
1045 | |
1046 // Add a klass to the system from a stream (called by jni_DefineClass and | |
1047 // JVM_DefineClass). | |
1048 // Note: class_name can be NULL. In that case we do not know the name of | |
1049 // the class until we have parsed the stream. | |
1050 | |
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1051 klassOop SystemDictionary::resolve_from_stream(Symbol* class_name, |
0 | 1052 Handle class_loader, |
1053 Handle protection_domain, | |
1054 ClassFileStream* st, | |
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1055 bool verify, |
0 | 1056 TRAPS) { |
1057 | |
514 | 1058 // Classloaders that support parallelism, e.g. bootstrap classloader, |
1059 // or all classloaders with UnsyncloadClass do not acquire lock here | |
1060 bool DoObjectLock = true; | |
1061 if (is_parallelCapable(class_loader)) { | |
1062 DoObjectLock = false; | |
1063 } | |
1064 | |
1065 // Make sure we are synchronized on the class loader before we proceed | |
0 | 1066 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); |
1067 check_loader_lock_contention(lockObject, THREAD); | |
514 | 1068 ObjectLocker ol(lockObject, THREAD, DoObjectLock); |
0 | 1069 |
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1070 TempNewSymbol parsed_name = NULL; |
0 | 1071 |
1072 // Parse the stream. Note that we do this even though this klass might | |
1073 // already be present in the SystemDictionary, otherwise we would not | |
1074 // throw potential ClassFormatErrors. | |
1075 // | |
1076 // Note: "name" is updated. | |
1077 // Further note: a placeholder will be added for this class when | |
1078 // super classes are loaded (resolve_super_or_fail). We expect this | |
1079 // to be called for all classes but java.lang.Object; and we preload | |
1080 // java.lang.Object through resolve_or_fail, not this path. | |
1081 | |
1082 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
1083 class_loader, | |
1084 protection_domain, | |
1085 parsed_name, | |
973
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1086 verify, |
0 | 1087 THREAD); |
1088 | |
1089 const char* pkg = "java/"; | |
1090 if (!HAS_PENDING_EXCEPTION && | |
1091 !class_loader.is_null() && | |
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1092 parsed_name != NULL && |
0 | 1093 !strncmp((const char*)parsed_name->bytes(), pkg, strlen(pkg))) { |
1094 // It is illegal to define classes in the "java." package from | |
1095 // JVM_DefineClass or jni_DefineClass unless you're the bootclassloader | |
1096 ResourceMark rm(THREAD); | |
1097 char* name = parsed_name->as_C_string(); | |
1098 char* index = strrchr(name, '/'); | |
1099 *index = '\0'; // chop to just the package name | |
1100 while ((index = strchr(name, '/')) != NULL) { | |
1101 *index = '.'; // replace '/' with '.' in package name | |
1102 } | |
1103 const char* fmt = "Prohibited package name: %s"; | |
1104 size_t len = strlen(fmt) + strlen(name); | |
1105 char* message = NEW_RESOURCE_ARRAY(char, len); | |
1106 jio_snprintf(message, len, fmt, name); | |
1107 Exceptions::_throw_msg(THREAD_AND_LOCATION, | |
1108 vmSymbols::java_lang_SecurityException(), message); | |
1109 } | |
1110 | |
1111 if (!HAS_PENDING_EXCEPTION) { | |
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1112 assert(parsed_name != NULL, "Sanity"); |
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1113 assert(class_name == NULL || class_name == parsed_name, "name mismatch"); |
0 | 1114 // Verification prevents us from creating names with dots in them, this |
1115 // asserts that that's the case. | |
1116 assert(is_internal_format(parsed_name), | |
1117 "external class name format used internally"); | |
1118 | |
1119 // Add class just loaded | |
514 | 1120 // If a class loader supports parallel classloading handle parallel define requests |
1121 // find_or_define_instance_class may return a different instanceKlass | |
1122 if (is_parallelCapable(class_loader)) { | |
1123 k = find_or_define_instance_class(class_name, class_loader, k, THREAD); | |
1124 } else { | |
1125 define_instance_class(k, THREAD); | |
1126 } | |
0 | 1127 } |
1128 | |
1129 // If parsing the class file or define_instance_class failed, we | |
1130 // need to remove the placeholder added on our behalf. But we | |
1131 // must make sure parsed_name is valid first (it won't be if we had | |
1132 // a format error before the class was parsed far enough to | |
1133 // find the name). | |
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1134 if (HAS_PENDING_EXCEPTION && parsed_name != NULL) { |
0 | 1135 unsigned int p_hash = placeholders()->compute_hash(parsed_name, |
1136 class_loader); | |
1137 int p_index = placeholders()->hash_to_index(p_hash); | |
1138 { | |
1139 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1140 placeholders()->find_and_remove(p_index, p_hash, parsed_name, class_loader, THREAD); | |
1141 SystemDictionary_lock->notify_all(); | |
1142 } | |
1143 return NULL; | |
1144 } | |
1145 | |
1146 // Make sure that we didn't leave a place holder in the | |
1147 // SystemDictionary; this is only done on success | |
1148 debug_only( { | |
1149 if (!HAS_PENDING_EXCEPTION) { | |
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1150 assert(parsed_name != NULL, "parsed_name is still null?"); |
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1151 Symbol* h_name = k->name(); |
0 | 1152 Handle h_loader (THREAD, k->class_loader()); |
1153 | |
1154 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1155 | |
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1156 klassOop check = find_class(parsed_name, class_loader); |
0 | 1157 assert(check == k(), "should be present in the dictionary"); |
1158 | |
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1159 klassOop check2 = find_class(h_name, h_loader); |
0 | 1160 assert(check == check2, "name inconsistancy in SystemDictionary"); |
1161 } | |
1162 } ); | |
1163 | |
1164 return k(); | |
1165 } | |
1166 | |
1167 | |
1168 void SystemDictionary::set_shared_dictionary(HashtableBucket* t, int length, | |
1169 int number_of_entries) { | |
1170 assert(length == _nof_buckets * sizeof(HashtableBucket), | |
1171 "bad shared dictionary size."); | |
1172 _shared_dictionary = new Dictionary(_nof_buckets, t, number_of_entries); | |
1173 } | |
1174 | |
1175 | |
1176 // If there is a shared dictionary, then find the entry for the | |
1177 // given shared system class, if any. | |
1178 | |
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1179 klassOop SystemDictionary::find_shared_class(Symbol* class_name) { |
0 | 1180 if (shared_dictionary() != NULL) { |
1181 unsigned int d_hash = dictionary()->compute_hash(class_name, Handle()); | |
1182 int d_index = dictionary()->hash_to_index(d_hash); | |
1183 return shared_dictionary()->find_shared_class(d_index, d_hash, class_name); | |
1184 } else { | |
1185 return NULL; | |
1186 } | |
1187 } | |
1188 | |
1189 | |
1190 // Load a class from the shared spaces (found through the shared system | |
1191 // dictionary). Force the superclass and all interfaces to be loaded. | |
1192 // Update the class definition to include sibling classes and no | |
1193 // subclasses (yet). [Classes in the shared space are not part of the | |
1194 // object hierarchy until loaded.] | |
1195 | |
1196 instanceKlassHandle SystemDictionary::load_shared_class( | |
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1197 Symbol* class_name, Handle class_loader, TRAPS) { |
0 | 1198 instanceKlassHandle ik (THREAD, find_shared_class(class_name)); |
1199 return load_shared_class(ik, class_loader, THREAD); | |
1200 } | |
1201 | |
1202 // Note well! Changes to this method may affect oop access order | |
1203 // in the shared archive. Please take care to not make changes that | |
1204 // adversely affect cold start time by changing the oop access order | |
1205 // that is specified in dump.cpp MarkAndMoveOrderedReadOnly and | |
1206 // MarkAndMoveOrderedReadWrite closures. | |
1207 instanceKlassHandle SystemDictionary::load_shared_class( | |
1208 instanceKlassHandle ik, Handle class_loader, TRAPS) { | |
1209 assert(class_loader.is_null(), "non-null classloader for shared class?"); | |
1210 if (ik.not_null()) { | |
1211 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1212 Symbol* class_name = ik->name(); |
0 | 1213 |
1214 // Found the class, now load the superclass and interfaces. If they | |
1215 // are shared, add them to the main system dictionary and reset | |
1216 // their hierarchy references (supers, subs, and interfaces). | |
1217 | |
1218 if (ik->super() != NULL) { | |
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1219 Symbol* cn = ik->super()->klass_part()->name(); |
0 | 1220 resolve_super_or_fail(class_name, cn, |
1221 class_loader, Handle(), true, CHECK_(nh)); | |
1222 } | |
1223 | |
1224 objArrayHandle interfaces (THREAD, ik->local_interfaces()); | |
1225 int num_interfaces = interfaces->length(); | |
1226 for (int index = 0; index < num_interfaces; index++) { | |
1227 klassOop k = klassOop(interfaces->obj_at(index)); | |
1228 | |
1229 // Note: can not use instanceKlass::cast here because | |
1230 // interfaces' instanceKlass's C++ vtbls haven't been | |
1231 // reinitialized yet (they will be once the interface classes | |
1232 // are loaded) | |
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1233 Symbol* name = k->klass_part()->name(); |
0 | 1234 resolve_super_or_fail(class_name, name, class_loader, Handle(), false, CHECK_(nh)); |
1235 } | |
1236 | |
1237 // Adjust methods to recover missing data. They need addresses for | |
1238 // interpreter entry points and their default native method address | |
1239 // must be reset. | |
1240 | |
1241 // Updating methods must be done under a lock so multiple | |
1242 // threads don't update these in parallel | |
1243 // Shared classes are all currently loaded by the bootstrap | |
1244 // classloader, so this will never cause a deadlock on | |
1245 // a custom class loader lock. | |
1246 | |
1247 { | |
1248 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
1249 check_loader_lock_contention(lockObject, THREAD); | |
1250 ObjectLocker ol(lockObject, THREAD, true); | |
1251 | |
1252 objArrayHandle methods (THREAD, ik->methods()); | |
1253 int num_methods = methods->length(); | |
1254 for (int index2 = 0; index2 < num_methods; ++index2) { | |
1255 methodHandle m(THREAD, methodOop(methods->obj_at(index2))); | |
1256 m()->link_method(m, CHECK_(nh)); | |
1257 } | |
1258 } | |
1259 | |
1260 if (TraceClassLoading) { | |
1261 ResourceMark rm; | |
1262 tty->print("[Loaded %s", ik->external_name()); | |
1263 tty->print(" from shared objects file"); | |
1264 tty->print_cr("]"); | |
1265 } | |
1266 // notify a class loaded from shared object | |
1267 ClassLoadingService::notify_class_loaded(instanceKlass::cast(ik()), | |
1268 true /* shared class */); | |
1269 } | |
1270 return ik; | |
1271 } | |
1272 | |
1273 #ifdef KERNEL | |
1274 // Some classes on the bootstrap class path haven't been installed on the | |
1275 // system yet. Call the DownloadManager method to make them appear in the | |
1276 // bootstrap class path and try again to load the named class. | |
1277 // Note that with delegation class loaders all classes in another loader will | |
1278 // first try to call this so it'd better be fast!! | |
1279 static instanceKlassHandle download_and_retry_class_load( | |
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1280 Symbol* class_name, |
0 | 1281 TRAPS) { |
1282 | |
1283 klassOop dlm = SystemDictionary::sun_jkernel_DownloadManager_klass(); | |
1284 instanceKlassHandle nk; | |
1285 | |
1286 // If download manager class isn't loaded just return. | |
1287 if (dlm == NULL) return nk; | |
1288 | |
1289 { HandleMark hm(THREAD); | |
1290 ResourceMark rm(THREAD); | |
1291 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nk)); | |
1292 Handle class_string = java_lang_String::externalize_classname(s, CHECK_(nk)); | |
1293 | |
1294 // return value | |
1295 JavaValue result(T_OBJECT); | |
1296 | |
1297 // Call the DownloadManager. We assume that it has a lock because | |
1298 // multiple classes could be not found and downloaded at the same time. | |
1299 // class sun.misc.DownloadManager; | |
1300 // public static String getBootClassPathEntryForClass(String className); | |
1301 JavaCalls::call_static(&result, | |
1302 KlassHandle(THREAD, dlm), | |
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1303 vmSymbols::getBootClassPathEntryForClass_name(), |
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1304 vmSymbols::string_string_signature(), |
0 | 1305 class_string, |
1306 CHECK_(nk)); | |
1307 | |
1308 // Get result.string and add to bootclasspath | |
1309 assert(result.get_type() == T_OBJECT, "just checking"); | |
1310 oop obj = (oop) result.get_jobject(); | |
1311 if (obj == NULL) { return nk; } | |
1312 | |
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1313 Handle h_obj(THREAD, obj); |
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1314 char* new_class_name = java_lang_String::as_platform_dependent_str(h_obj, |
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1315 CHECK_(nk)); |
0 | 1316 |
1317 // lock the loader | |
1318 // we use this lock because JVMTI does. | |
1319 Handle loader_lock(THREAD, SystemDictionary::system_loader_lock()); | |
1320 | |
1321 ObjectLocker ol(loader_lock, THREAD); | |
1322 // add the file to the bootclasspath | |
1323 ClassLoader::update_class_path_entry_list(new_class_name, true); | |
1324 } // end HandleMark | |
1325 | |
1326 if (TraceClassLoading) { | |
1327 ClassLoader::print_bootclasspath(); | |
1328 } | |
1329 return ClassLoader::load_classfile(class_name, CHECK_(nk)); | |
1330 } | |
1331 #endif // KERNEL | |
1332 | |
1333 | |
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1334 instanceKlassHandle SystemDictionary::load_instance_class(Symbol* class_name, Handle class_loader, TRAPS) { |
0 | 1335 instanceKlassHandle nh = instanceKlassHandle(); // null Handle |
1336 if (class_loader.is_null()) { | |
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1337 |
0 | 1338 // Search the shared system dictionary for classes preloaded into the |
1339 // shared spaces. | |
1340 instanceKlassHandle k; | |
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1341 { |
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1342 PerfTraceTime vmtimer(ClassLoader::perf_shared_classload_time()); |
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1343 k = load_shared_class(class_name, class_loader, THREAD); |
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1344 } |
0 | 1345 |
1346 if (k.is_null()) { | |
1347 // Use VM class loader | |
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1348 PerfTraceTime vmtimer(ClassLoader::perf_sys_classload_time()); |
0 | 1349 k = ClassLoader::load_classfile(class_name, CHECK_(nh)); |
1350 } | |
1351 | |
1352 #ifdef KERNEL | |
1353 // If the VM class loader has failed to load the class, call the | |
1354 // DownloadManager class to make it magically appear on the classpath | |
1355 // and try again. This is only configured with the Kernel VM. | |
1356 if (k.is_null()) { | |
1357 k = download_and_retry_class_load(class_name, CHECK_(nh)); | |
1358 } | |
1359 #endif // KERNEL | |
1360 | |
514 | 1361 // find_or_define_instance_class may return a different instanceKlass |
0 | 1362 if (!k.is_null()) { |
1363 k = find_or_define_instance_class(class_name, class_loader, k, CHECK_(nh)); | |
1364 } | |
1365 return k; | |
1366 } else { | |
1367 // Use user specified class loader to load class. Call loadClass operation on class_loader. | |
1368 ResourceMark rm(THREAD); | |
1369 | |
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1370 assert(THREAD->is_Java_thread(), "must be a JavaThread"); |
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1371 JavaThread* jt = (JavaThread*) THREAD; |
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1372 |
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1373 PerfClassTraceTime vmtimer(ClassLoader::perf_app_classload_time(), |
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1374 ClassLoader::perf_app_classload_selftime(), |
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1375 ClassLoader::perf_app_classload_count(), |
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1376 jt->get_thread_stat()->perf_recursion_counts_addr(), |
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1377 jt->get_thread_stat()->perf_timers_addr(), |
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1378 PerfClassTraceTime::CLASS_LOAD); |
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1379 |
0 | 1380 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nh)); |
1381 // Translate to external class name format, i.e., convert '/' chars to '.' | |
1382 Handle string = java_lang_String::externalize_classname(s, CHECK_(nh)); | |
1383 | |
1384 JavaValue result(T_OBJECT); | |
1385 | |
1142 | 1386 KlassHandle spec_klass (THREAD, SystemDictionary::ClassLoader_klass()); |
0 | 1387 |
514 | 1388 // Call public unsynchronized loadClass(String) directly for all class loaders |
1389 // for parallelCapable class loaders. JDK >=7, loadClass(String, boolean) will | |
1390 // acquire a class-name based lock rather than the class loader object lock. | |
1391 // JDK < 7 already acquire the class loader lock in loadClass(String, boolean), | |
1392 // so the call to loadClassInternal() was not required. | |
1393 // | |
1394 // UnsyncloadClass flag means both call loadClass(String) and do | |
1395 // not acquire the class loader lock even for class loaders that are | |
1396 // not parallelCapable. This was a risky transitional | |
1397 // flag for diagnostic purposes only. It is risky to call | |
0 | 1398 // custom class loaders without synchronization. |
1399 // WARNING If a custom class loader does NOT synchronizer findClass, or callers of | |
514 | 1400 // findClass, the UnsyncloadClass flag risks unexpected timing bugs in the field. |
0 | 1401 // Do NOT assume this will be supported in future releases. |
514 | 1402 // |
1403 // Added MustCallLoadClassInternal in case we discover in the field | |
1404 // a customer that counts on this call | |
1405 if (MustCallLoadClassInternal && has_loadClassInternal()) { | |
0 | 1406 JavaCalls::call_special(&result, |
1407 class_loader, | |
1408 spec_klass, | |
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1409 vmSymbols::loadClassInternal_name(), |
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1410 vmSymbols::string_class_signature(), |
0 | 1411 string, |
1412 CHECK_(nh)); | |
1413 } else { | |
1414 JavaCalls::call_virtual(&result, | |
1415 class_loader, | |
1416 spec_klass, | |
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1417 vmSymbols::loadClass_name(), |
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1418 vmSymbols::string_class_signature(), |
0 | 1419 string, |
1420 CHECK_(nh)); | |
1421 } | |
1422 | |
1423 assert(result.get_type() == T_OBJECT, "just checking"); | |
1424 oop obj = (oop) result.get_jobject(); | |
1425 | |
1426 // Primitive classes return null since forName() can not be | |
1427 // used to obtain any of the Class objects representing primitives or void | |
1428 if ((obj != NULL) && !(java_lang_Class::is_primitive(obj))) { | |
1429 instanceKlassHandle k = | |
1430 instanceKlassHandle(THREAD, java_lang_Class::as_klassOop(obj)); | |
1431 // For user defined Java class loaders, check that the name returned is | |
1432 // the same as that requested. This check is done for the bootstrap | |
1433 // loader when parsing the class file. | |
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1434 if (class_name == k->name()) { |
0 | 1435 return k; |
1436 } | |
1437 } | |
1438 // Class is not found or has the wrong name, return NULL | |
1439 return nh; | |
1440 } | |
1441 } | |
1442 | |
1443 void SystemDictionary::define_instance_class(instanceKlassHandle k, TRAPS) { | |
1444 | |
1445 Handle class_loader_h(THREAD, k->class_loader()); | |
1446 | |
514 | 1447 // for bootstrap and other parallel classloaders don't acquire lock, |
1448 // use placeholder token | |
1449 // If a parallelCapable class loader calls define_instance_class instead of | |
1450 // find_or_define_instance_class to get here, we have a timing | |
1451 // hole with systemDictionary updates and check_constraints | |
1452 if (!class_loader_h.is_null() && !is_parallelCapable(class_loader_h)) { | |
0 | 1453 assert(ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, |
1454 compute_loader_lock_object(class_loader_h, THREAD)), | |
1455 "define called without lock"); | |
1456 } | |
1457 | |
1458 // Check class-loading constraints. Throw exception if violation is detected. | |
1459 // Grabs and releases SystemDictionary_lock | |
1460 // The check_constraints/find_class call and update_dictionary sequence | |
1461 // must be "atomic" for a specific class/classloader pair so we never | |
1462 // define two different instanceKlasses for that class/classloader pair. | |
1463 // Existing classloaders will call define_instance_class with the | |
1464 // classloader lock held | |
1465 // Parallel classloaders will call find_or_define_instance_class | |
1466 // which will require a token to perform the define class | |
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1467 Symbol* name_h = k->name(); |
0 | 1468 unsigned int d_hash = dictionary()->compute_hash(name_h, class_loader_h); |
1469 int d_index = dictionary()->hash_to_index(d_hash); | |
1470 check_constraints(d_index, d_hash, k, class_loader_h, true, CHECK); | |
1471 | |
1472 // Register class just loaded with class loader (placed in Vector) | |
1473 // Note we do this before updating the dictionary, as this can | |
1474 // fail with an OutOfMemoryError (if it does, we will *not* put this | |
1475 // class in the dictionary and will not update the class hierarchy). | |
1476 if (k->class_loader() != NULL) { | |
1477 methodHandle m(THREAD, Universe::loader_addClass_method()); | |
1478 JavaValue result(T_VOID); | |
1479 JavaCallArguments args(class_loader_h); | |
1480 args.push_oop(Handle(THREAD, k->java_mirror())); | |
1481 JavaCalls::call(&result, m, &args, CHECK); | |
1482 } | |
1483 | |
1484 // Add the new class. We need recompile lock during update of CHA. | |
1485 { | |
1486 unsigned int p_hash = placeholders()->compute_hash(name_h, class_loader_h); | |
1487 int p_index = placeholders()->hash_to_index(p_hash); | |
1488 | |
1489 MutexLocker mu_r(Compile_lock, THREAD); | |
1490 | |
1491 // Add to class hierarchy, initialize vtables, and do possible | |
1492 // deoptimizations. | |
1493 add_to_hierarchy(k, CHECK); // No exception, but can block | |
1494 | |
1495 // Add to systemDictionary - so other classes can see it. | |
1496 // Grabs and releases SystemDictionary_lock | |
1497 update_dictionary(d_index, d_hash, p_index, p_hash, | |
1498 k, class_loader_h, THREAD); | |
1499 } | |
1500 k->eager_initialize(THREAD); | |
1501 | |
1502 // notify jvmti | |
1503 if (JvmtiExport::should_post_class_load()) { | |
1504 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); | |
1505 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); | |
1506 | |
1507 } | |
1508 } | |
1509 | |
1510 // Support parallel classloading | |
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1511 // All parallel class loaders, including bootstrap classloader |
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1512 // lock a placeholder entry for this class/class_loader pair |
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1513 // to allow parallel defines of different classes for this class loader |
514 | 1514 // With AllowParallelDefine flag==true, in case they do not synchronize around |
1515 // FindLoadedClass/DefineClass, calls, we check for parallel | |
0 | 1516 // loading for them, wait if a defineClass is in progress |
1517 // and return the initial requestor's results | |
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1518 // This flag does not apply to the bootstrap classloader. |
514 | 1519 // With AllowParallelDefine flag==false, call through to define_instance_class |
1520 // which will throw LinkageError: duplicate class definition. | |
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1521 // False is the requested default. |
0 | 1522 // For better performance, the class loaders should synchronize |
514 | 1523 // findClass(), i.e. FindLoadedClass/DefineClassIfAbsent or they |
0 | 1524 // potentially waste time reading and parsing the bytestream. |
1525 // Note: VM callers should ensure consistency of k/class_name,class_loader | |
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1526 instanceKlassHandle SystemDictionary::find_or_define_instance_class(Symbol* class_name, Handle class_loader, instanceKlassHandle k, TRAPS) { |
0 | 1527 |
1528 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1529 Symbol* name_h = k->name(); // passed in class_name may be null |
0 | 1530 |
515 | 1531 unsigned int d_hash = dictionary()->compute_hash(name_h, class_loader); |
0 | 1532 int d_index = dictionary()->hash_to_index(d_hash); |
1533 | |
1534 // Hold SD lock around find_class and placeholder creation for DEFINE_CLASS | |
515 | 1535 unsigned int p_hash = placeholders()->compute_hash(name_h, class_loader); |
0 | 1536 int p_index = placeholders()->hash_to_index(p_hash); |
1537 PlaceholderEntry* probe; | |
1538 | |
1539 { | |
1540 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1541 // First check if class already defined | |
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1542 if (UnsyncloadClass || (is_parallelDefine(class_loader))) { |
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1543 klassOop check = find_class(d_index, d_hash, name_h, class_loader); |
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1544 if (check != NULL) { |
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1545 return(instanceKlassHandle(THREAD, check)); |
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1546 } |
0 | 1547 } |
1548 | |
1549 // Acquire define token for this class/classloader | |
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1550 probe = placeholders()->find_and_add(p_index, p_hash, name_h, class_loader, PlaceholderTable::DEFINE_CLASS, NULL, THREAD); |
514 | 1551 // Wait if another thread defining in parallel |
1552 // All threads wait - even those that will throw duplicate class: otherwise | |
1553 // caller is surprised by LinkageError: duplicate, but findLoadedClass fails | |
1554 // if other thread has not finished updating dictionary | |
1555 while (probe->definer() != NULL) { | |
1556 SystemDictionary_lock->wait(); | |
1557 } | |
1558 // Only special cases allow parallel defines and can use other thread's results | |
1559 // Other cases fall through, and may run into duplicate defines | |
1560 // caught by finding an entry in the SystemDictionary | |
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1561 if ((UnsyncloadClass || is_parallelDefine(class_loader)) && (probe->instanceKlass() != NULL)) { |
0 | 1562 probe->remove_seen_thread(THREAD, PlaceholderTable::DEFINE_CLASS); |
515 | 1563 placeholders()->find_and_remove(p_index, p_hash, name_h, class_loader, THREAD); |
514 | 1564 SystemDictionary_lock->notify_all(); |
0 | 1565 #ifdef ASSERT |
515 | 1566 klassOop check = find_class(d_index, d_hash, name_h, class_loader); |
514 | 1567 assert(check != NULL, "definer missed recording success"); |
0 | 1568 #endif |
514 | 1569 return(instanceKlassHandle(THREAD, probe->instanceKlass())); |
0 | 1570 } else { |
514 | 1571 // This thread will define the class (even if earlier thread tried and had an error) |
1572 probe->set_definer(THREAD); | |
0 | 1573 } |
1574 } | |
1575 | |
1576 define_instance_class(k, THREAD); | |
1577 | |
1578 Handle linkage_exception = Handle(); // null handle | |
1579 | |
1580 // definer must notify any waiting threads | |
1581 { | |
1582 MutexLocker mu(SystemDictionary_lock, THREAD); | |
515 | 1583 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name_h, class_loader); |
0 | 1584 assert(probe != NULL, "DEFINE_CLASS placeholder lost?"); |
1585 if (probe != NULL) { | |
1586 if (HAS_PENDING_EXCEPTION) { | |
1587 linkage_exception = Handle(THREAD,PENDING_EXCEPTION); | |
1588 CLEAR_PENDING_EXCEPTION; | |
1589 } else { | |
1590 probe->set_instanceKlass(k()); | |
1591 } | |
1592 probe->set_definer(NULL); | |
1593 probe->remove_seen_thread(THREAD, PlaceholderTable::DEFINE_CLASS); | |
515 | 1594 placeholders()->find_and_remove(p_index, p_hash, name_h, class_loader, THREAD); |
0 | 1595 SystemDictionary_lock->notify_all(); |
1596 } | |
1597 } | |
1598 | |
1599 // Can't throw exception while holding lock due to rank ordering | |
1600 if (linkage_exception() != NULL) { | |
1601 THROW_OOP_(linkage_exception(), nh); // throws exception and returns | |
1602 } | |
1603 | |
1604 return k; | |
1605 } | |
1606 Handle SystemDictionary::compute_loader_lock_object(Handle class_loader, TRAPS) { | |
1607 // If class_loader is NULL we synchronize on _system_loader_lock_obj | |
1608 if (class_loader.is_null()) { | |
1609 return Handle(THREAD, _system_loader_lock_obj); | |
1610 } else { | |
1611 return class_loader; | |
1612 } | |
1613 } | |
1614 | |
1615 // This method is added to check how often we have to wait to grab loader | |
1616 // lock. The results are being recorded in the performance counters defined in | |
1617 // ClassLoader::_sync_systemLoaderLockContentionRate and | |
1618 // ClassLoader::_sync_nonSystemLoaderLockConteionRate. | |
1619 void SystemDictionary::check_loader_lock_contention(Handle loader_lock, TRAPS) { | |
1620 if (!UsePerfData) { | |
1621 return; | |
1622 } | |
1623 | |
1624 assert(!loader_lock.is_null(), "NULL lock object"); | |
1625 | |
1626 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader_lock) | |
1627 == ObjectSynchronizer::owner_other) { | |
1628 // contention will likely happen, so increment the corresponding | |
1629 // contention counter. | |
1630 if (loader_lock() == _system_loader_lock_obj) { | |
1631 ClassLoader::sync_systemLoaderLockContentionRate()->inc(); | |
1632 } else { | |
1633 ClassLoader::sync_nonSystemLoaderLockContentionRate()->inc(); | |
1634 } | |
1635 } | |
1636 } | |
1637 | |
1638 // ---------------------------------------------------------------------------- | |
1639 // Lookup | |
1640 | |
1641 klassOop SystemDictionary::find_class(int index, unsigned int hash, | |
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1642 Symbol* class_name, |
0 | 1643 Handle class_loader) { |
1644 assert_locked_or_safepoint(SystemDictionary_lock); | |
1645 assert (index == dictionary()->index_for(class_name, class_loader), | |
1646 "incorrect index?"); | |
1647 | |
1648 klassOop k = dictionary()->find_class(index, hash, class_name, class_loader); | |
1649 return k; | |
1650 } | |
1651 | |
1652 | |
1653 // Basic find on classes in the midst of being loaded | |
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1654 Symbol* SystemDictionary::find_placeholder(Symbol* class_name, |
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1655 Handle class_loader) { |
0 | 1656 assert_locked_or_safepoint(SystemDictionary_lock); |
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1657 unsigned int p_hash = placeholders()->compute_hash(class_name, class_loader); |
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1658 int p_index = placeholders()->hash_to_index(p_hash); |
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1659 return placeholders()->find_entry(p_index, p_hash, class_name, class_loader); |
0 | 1660 } |
1661 | |
1662 | |
1663 // Used for assertions and verification only | |
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1664 klassOop SystemDictionary::find_class(Symbol* class_name, Handle class_loader) { |
0 | 1665 #ifndef ASSERT |
1666 guarantee(VerifyBeforeGC || | |
1667 VerifyDuringGC || | |
1668 VerifyBeforeExit || | |
1669 VerifyAfterGC, "too expensive"); | |
1670 #endif | |
1671 assert_locked_or_safepoint(SystemDictionary_lock); | |
1672 | |
1673 // First look in the loaded class array | |
1674 unsigned int d_hash = dictionary()->compute_hash(class_name, class_loader); | |
1675 int d_index = dictionary()->hash_to_index(d_hash); | |
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1676 return find_class(d_index, d_hash, class_name, class_loader); |
0 | 1677 } |
1678 | |
1679 | |
1680 // Get the next class in the diictionary. | |
1681 klassOop SystemDictionary::try_get_next_class() { | |
1682 return dictionary()->try_get_next_class(); | |
1683 } | |
1684 | |
1685 | |
1686 // ---------------------------------------------------------------------------- | |
1687 // Update hierachy. This is done before the new klass has been added to the SystemDictionary. The Recompile_lock | |
1688 // is held, to ensure that the compiler is not using the class hierachy, and that deoptimization will kick in | |
1689 // before a new class is used. | |
1690 | |
1691 void SystemDictionary::add_to_hierarchy(instanceKlassHandle k, TRAPS) { | |
1692 assert(k.not_null(), "just checking"); | |
1693 // Link into hierachy. Make sure the vtables are initialized before linking into | |
1694 k->append_to_sibling_list(); // add to superklass/sibling list | |
1695 k->process_interfaces(THREAD); // handle all "implements" declarations | |
1696 k->set_init_state(instanceKlass::loaded); | |
1697 // Now flush all code that depended on old class hierarchy. | |
1698 // Note: must be done *after* linking k into the hierarchy (was bug 12/9/97) | |
1699 // Also, first reinitialize vtable because it may have gotten out of synch | |
1700 // while the new class wasn't connected to the class hierarchy. | |
1701 Universe::flush_dependents_on(k); | |
1702 } | |
1703 | |
1704 | |
1705 // ---------------------------------------------------------------------------- | |
1706 // GC support | |
1707 | |
1708 // Following roots during mark-sweep is separated in two phases. | |
1709 // | |
1710 // The first phase follows preloaded classes and all other system | |
1711 // classes, since these will never get unloaded anyway. | |
1712 // | |
1713 // The second phase removes (unloads) unreachable classes from the | |
1714 // system dictionary and follows the remaining classes' contents. | |
1715 | |
1716 void SystemDictionary::always_strong_oops_do(OopClosure* blk) { | |
1717 // Follow preloaded classes/mirrors and system loader object | |
1718 blk->do_oop(&_java_system_loader); | |
1719 preloaded_oops_do(blk); | |
1720 always_strong_classes_do(blk); | |
1721 } | |
1722 | |
1723 | |
1724 void SystemDictionary::always_strong_classes_do(OopClosure* blk) { | |
1725 // Follow all system classes and temporary placeholders in dictionary | |
1726 dictionary()->always_strong_classes_do(blk); | |
1727 | |
1728 // Placeholders. These are *always* strong roots, as they | |
1729 // represent classes we're actively loading. | |
1730 placeholders_do(blk); | |
1731 | |
710 | 1732 // Visit extra methods |
1903 | 1733 invoke_method_table()->oops_do(blk); |
0 | 1734 } |
1735 | |
1736 | |
1737 void SystemDictionary::placeholders_do(OopClosure* blk) { | |
1738 placeholders()->oops_do(blk); | |
1739 } | |
1740 | |
1741 | |
1742 bool SystemDictionary::do_unloading(BoolObjectClosure* is_alive) { | |
1743 bool result = dictionary()->do_unloading(is_alive); | |
1744 constraints()->purge_loader_constraints(is_alive); | |
1745 resolution_errors()->purge_resolution_errors(is_alive); | |
1746 return result; | |
1747 } | |
1748 | |
1749 | |
1750 // The mirrors are scanned by shared_oops_do() which is | |
1751 // not called by oops_do(). In order to process oops in | |
1752 // a necessary order, shared_oops_do() is call by | |
1753 // Universe::oops_do(). | |
1754 void SystemDictionary::oops_do(OopClosure* f) { | |
1755 // Adjust preloaded classes and system loader object | |
1756 f->do_oop(&_java_system_loader); | |
1757 preloaded_oops_do(f); | |
1758 | |
1759 lazily_loaded_oops_do(f); | |
1760 | |
1761 // Adjust dictionary | |
1762 dictionary()->oops_do(f); | |
1763 | |
710 | 1764 // Visit extra methods |
1903 | 1765 invoke_method_table()->oops_do(f); |
710 | 1766 |
0 | 1767 // Partially loaded classes |
1768 placeholders()->oops_do(f); | |
1769 | |
1770 // Adjust constraint table | |
1771 constraints()->oops_do(f); | |
1772 | |
1773 // Adjust resolution error table | |
1774 resolution_errors()->oops_do(f); | |
1775 } | |
1776 | |
1777 | |
1778 void SystemDictionary::preloaded_oops_do(OopClosure* f) { | |
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1779 for (int k = (int)FIRST_WKID; k < (int)WKID_LIMIT; k++) { |
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1780 f->do_oop((oop*) &_well_known_klasses[k]); |
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1781 } |
0 | 1782 |
1783 { | |
1784 for (int i = 0; i < T_VOID+1; i++) { | |
1785 if (_box_klasses[i] != NULL) { | |
1786 assert(i >= T_BOOLEAN, "checking"); | |
1787 f->do_oop((oop*) &_box_klasses[i]); | |
1788 } | |
1789 } | |
1790 } | |
1791 | |
1792 // The basic type mirrors would have already been processed in | |
1793 // Universe::oops_do(), via a call to shared_oops_do(), so should | |
1794 // not be processed again. | |
1795 | |
1796 f->do_oop((oop*) &_system_loader_lock_obj); | |
1797 FilteredFieldsMap::klasses_oops_do(f); | |
1798 } | |
1799 | |
1800 void SystemDictionary::lazily_loaded_oops_do(OopClosure* f) { | |
1801 f->do_oop((oop*) &_abstract_ownable_synchronizer_klass); | |
1802 } | |
1803 | |
1804 // Just the classes from defining class loaders | |
1805 // Don't iterate over placeholders | |
1806 void SystemDictionary::classes_do(void f(klassOop)) { | |
1807 dictionary()->classes_do(f); | |
1808 } | |
1809 | |
1810 // Added for initialize_itable_for_klass | |
1811 // Just the classes from defining class loaders | |
1812 // Don't iterate over placeholders | |
1813 void SystemDictionary::classes_do(void f(klassOop, TRAPS), TRAPS) { | |
1814 dictionary()->classes_do(f, CHECK); | |
1815 } | |
1816 | |
1817 // All classes, and their class loaders | |
1818 // Don't iterate over placeholders | |
1819 void SystemDictionary::classes_do(void f(klassOop, oop)) { | |
1820 dictionary()->classes_do(f); | |
1821 } | |
1822 | |
1823 // All classes, and their class loaders | |
1824 // (added for helpers that use HandleMarks and ResourceMarks) | |
1825 // Don't iterate over placeholders | |
1826 void SystemDictionary::classes_do(void f(klassOop, oop, TRAPS), TRAPS) { | |
1827 dictionary()->classes_do(f, CHECK); | |
1828 } | |
1829 | |
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1830 void SystemDictionary::placeholders_do(void f(Symbol*, oop)) { |
0 | 1831 placeholders()->entries_do(f); |
1832 } | |
1833 | |
1834 void SystemDictionary::methods_do(void f(methodOop)) { | |
1835 dictionary()->methods_do(f); | |
1903 | 1836 invoke_method_table()->methods_do(f); |
0 | 1837 } |
1838 | |
1839 // ---------------------------------------------------------------------------- | |
1840 // Lazily load klasses | |
1841 | |
1842 void SystemDictionary::load_abstract_ownable_synchronizer_klass(TRAPS) { | |
1843 assert(JDK_Version::is_gte_jdk16x_version(), "Must be JDK 1.6 or later"); | |
1844 | |
1845 // if multiple threads calling this function, only one thread will load | |
1846 // the class. The other threads will find the loaded version once the | |
1847 // class is loaded. | |
1848 klassOop aos = _abstract_ownable_synchronizer_klass; | |
1849 if (aos == NULL) { | |
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1850 klassOop k = resolve_or_fail(vmSymbols::java_util_concurrent_locks_AbstractOwnableSynchronizer(), true, CHECK); |
0 | 1851 // Force a fence to prevent any read before the write completes |
1852 OrderAccess::fence(); | |
1853 _abstract_ownable_synchronizer_klass = k; | |
1854 } | |
1855 } | |
1856 | |
1857 // ---------------------------------------------------------------------------- | |
1858 // Initialization | |
1859 | |
1860 void SystemDictionary::initialize(TRAPS) { | |
1861 // Allocate arrays | |
1862 assert(dictionary() == NULL, | |
1863 "SystemDictionary should only be initialized once"); | |
1903 | 1864 _dictionary = new Dictionary(_nof_buckets); |
1865 _placeholders = new PlaceholderTable(_nof_buckets); | |
0 | 1866 _number_of_modifications = 0; |
1903 | 1867 _loader_constraints = new LoaderConstraintTable(_loader_constraint_size); |
1868 _resolution_errors = new ResolutionErrorTable(_resolution_error_size); | |
1869 _invoke_method_table = new SymbolPropertyTable(_invoke_method_size); | |
0 | 1870 |
1871 // Allocate private object used as system class loader lock | |
1872 _system_loader_lock_obj = oopFactory::new_system_objArray(0, CHECK); | |
1873 // Initialize basic classes | |
1874 initialize_preloaded_classes(CHECK); | |
1875 } | |
1876 | |
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1877 // Compact table of directions on the initialization of klasses: |
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1878 static const short wk_init_info[] = { |
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1879 #define WK_KLASS_INIT_INFO(name, symbol, option) \ |
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1880 ( ((int)vmSymbols::VM_SYMBOL_ENUM_NAME(symbol) \ |
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1881 << SystemDictionary::CEIL_LG_OPTION_LIMIT) \ |
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1882 | (int)SystemDictionary::option ), |
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1883 WK_KLASSES_DO(WK_KLASS_INIT_INFO) |
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1884 #undef WK_KLASS_INIT_INFO |
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1885 0 |
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1886 }; |
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1887 |
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1888 bool SystemDictionary::initialize_wk_klass(WKID id, int init_opt, TRAPS) { |
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1889 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1890 int info = wk_init_info[id - FIRST_WKID]; |
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1891 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1892 Symbol* symbol = vmSymbols::symbol_at((vmSymbols::SID)sid); |
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1893 klassOop* klassp = &_well_known_klasses[id]; |
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1894 bool must_load = (init_opt < SystemDictionary::Opt); |
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1895 bool try_load = true; |
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1896 if (init_opt == SystemDictionary::Opt_Kernel) { |
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1897 #ifndef KERNEL |
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1898 try_load = false; |
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1899 #endif //KERNEL |
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1900 } |
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1901 if ((*klassp) == NULL && try_load) { |
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1902 if (must_load) { |
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1903 (*klassp) = resolve_or_fail(symbol, true, CHECK_0); // load required class |
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1904 } else { |
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1905 (*klassp) = resolve_or_null(symbol, CHECK_0); // load optional klass |
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1906 } |
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1907 } |
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1908 return ((*klassp) != NULL); |
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1909 } |
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1910 |
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1911 void SystemDictionary::initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS) { |
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1912 assert((int)start_id <= (int)limit_id, "IDs are out of order!"); |
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1913 for (int id = (int)start_id; id < (int)limit_id; id++) { |
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1914 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1915 int info = wk_init_info[id - FIRST_WKID]; |
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1916 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1917 int opt = (info & right_n_bits(CEIL_LG_OPTION_LIMIT)); |
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1918 |
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1919 initialize_wk_klass((WKID)id, opt, CHECK); |
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1920 |
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1921 // Update limits, so find_well_known_klass can be very fast: |
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1922 Symbol* s = vmSymbols::symbol_at((vmSymbols::SID)sid); |
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1923 if (wk_klass_name_limits[1] == NULL) { |
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1924 wk_klass_name_limits[0] = wk_klass_name_limits[1] = s; |
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1925 } else if (wk_klass_name_limits[1] < s) { |
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1926 wk_klass_name_limits[1] = s; |
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1927 } else if (wk_klass_name_limits[0] > s) { |
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1928 wk_klass_name_limits[0] = s; |
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1929 } |
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1930 } |
710 | 1931 |
1932 // move the starting value forward to the limit: | |
1933 start_id = limit_id; | |
132
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1934 } |
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1935 |
0 | 1936 |
1937 void SystemDictionary::initialize_preloaded_classes(TRAPS) { | |
1142 | 1938 assert(WK_KLASS(Object_klass) == NULL, "preloaded classes should only be initialized once"); |
0 | 1939 // Preload commonly used klasses |
132
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1940 WKID scan = FIRST_WKID; |
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1941 // first do Object, String, Class |
1142 | 1942 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
132
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1943 |
1142 | 1944 debug_only(instanceKlass::verify_class_klass_nonstatic_oop_maps(WK_KLASS(Class_klass))); |
132
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1945 |
0 | 1946 // Fixup mirrors for classes loaded before java.lang.Class. |
1947 // These calls iterate over the objects currently in the perm gen | |
1948 // so calling them at this point is matters (not before when there | |
1949 // are fewer objects and not later after there are more objects | |
1950 // in the perm gen. | |
1951 Universe::initialize_basic_type_mirrors(CHECK); | |
1952 Universe::fixup_mirrors(CHECK); | |
1953 | |
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1954 // do a bunch more: |
1142 | 1955 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Reference_klass), scan, CHECK); |
0 | 1956 |
1957 // Preload ref klasses and set reference types | |
1142 | 1958 instanceKlass::cast(WK_KLASS(Reference_klass))->set_reference_type(REF_OTHER); |
1959 instanceRefKlass::update_nonstatic_oop_maps(WK_KLASS(Reference_klass)); | |
0 | 1960 |
1142 | 1961 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(PhantomReference_klass), scan, CHECK); |
1962 instanceKlass::cast(WK_KLASS(SoftReference_klass))->set_reference_type(REF_SOFT); | |
1963 instanceKlass::cast(WK_KLASS(WeakReference_klass))->set_reference_type(REF_WEAK); | |
1964 instanceKlass::cast(WK_KLASS(FinalReference_klass))->set_reference_type(REF_FINAL); | |
1965 instanceKlass::cast(WK_KLASS(PhantomReference_klass))->set_reference_type(REF_PHANTOM); | |
132
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1966 |
710 | 1967 WKID meth_group_start = WK_KLASS_ENUM_NAME(MethodHandle_klass); |
1968 WKID meth_group_end = WK_KLASS_ENUM_NAME(WrongMethodTypeException_klass); | |
1969 initialize_wk_klasses_until(meth_group_start, scan, CHECK); | |
1970 if (EnableMethodHandles) { | |
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1971 initialize_wk_klasses_through(meth_group_end, scan, CHECK); |
710 | 1972 } |
1973 if (_well_known_klasses[meth_group_start] == NULL) { | |
1974 // Skip the rest of the method handle classes, if MethodHandle is not loaded. | |
1975 scan = WKID(meth_group_end+1); | |
1976 } | |
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1977 WKID indy_group_start = WK_KLASS_ENUM_NAME(Linkage_klass); |
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1978 WKID indy_group_end = WK_KLASS_ENUM_NAME(CallSite_klass); |
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1979 initialize_wk_klasses_until(indy_group_start, scan, CHECK); |
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1980 if (EnableInvokeDynamic) { |
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1981 initialize_wk_klasses_through(indy_group_end, scan, CHECK); |
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1982 } |
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1983 if (_well_known_klasses[indy_group_start] == NULL) { |
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1984 // Skip the rest of the dynamic typing classes, if Linkage is not loaded. |
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1985 scan = WKID(indy_group_end+1); |
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1986 } |
710 | 1987 |
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1988 initialize_wk_klasses_until(WKID_LIMIT, scan, CHECK); |
0 | 1989 |
1142 | 1990 _box_klasses[T_BOOLEAN] = WK_KLASS(Boolean_klass); |
1991 _box_klasses[T_CHAR] = WK_KLASS(Character_klass); | |
1992 _box_klasses[T_FLOAT] = WK_KLASS(Float_klass); | |
1993 _box_klasses[T_DOUBLE] = WK_KLASS(Double_klass); | |
1994 _box_klasses[T_BYTE] = WK_KLASS(Byte_klass); | |
1995 _box_klasses[T_SHORT] = WK_KLASS(Short_klass); | |
1996 _box_klasses[T_INT] = WK_KLASS(Integer_klass); | |
1997 _box_klasses[T_LONG] = WK_KLASS(Long_klass); | |
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1998 //_box_klasses[T_OBJECT] = WK_KLASS(object_klass); |
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1999 //_box_klasses[T_ARRAY] = WK_KLASS(object_klass); |
0 | 2000 |
2001 #ifdef KERNEL | |
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2002 if (sun_jkernel_DownloadManager_klass() == NULL) { |
0 | 2003 warning("Cannot find sun/jkernel/DownloadManager"); |
2004 } | |
2005 #endif // KERNEL | |
514 | 2006 |
0 | 2007 { // Compute whether we should use loadClass or loadClassInternal when loading classes. |
1142 | 2008 methodOop method = instanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::loadClassInternal_name(), vmSymbols::string_class_signature()); |
0 | 2009 _has_loadClassInternal = (method != NULL); |
2010 } | |
2011 { // Compute whether we should use checkPackageAccess or NOT | |
1142 | 2012 methodOop method = instanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::checkPackageAccess_name(), vmSymbols::class_protectiondomain_signature()); |
0 | 2013 _has_checkPackageAccess = (method != NULL); |
2014 } | |
2015 } | |
2016 | |
2017 // Tells if a given klass is a box (wrapper class, such as java.lang.Integer). | |
2018 // If so, returns the basic type it holds. If not, returns T_OBJECT. | |
2019 BasicType SystemDictionary::box_klass_type(klassOop k) { | |
2020 assert(k != NULL, ""); | |
2021 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { | |
2022 if (_box_klasses[i] == k) | |
2023 return (BasicType)i; | |
2024 } | |
2025 return T_OBJECT; | |
2026 } | |
2027 | |
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2028 KlassHandle SystemDictionaryHandles::box_klass(BasicType t) { |
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2029 if (t >= T_BOOLEAN && t <= T_VOID) |
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2030 return KlassHandle(&SystemDictionary::_box_klasses[t], true); |
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2031 else |
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2032 return KlassHandle(); |
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2033 } |
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2034 |
0 | 2035 // Constraints on class loaders. The details of the algorithm can be |
2036 // found in the OOPSLA'98 paper "Dynamic Class Loading in the Java | |
2037 // Virtual Machine" by Sheng Liang and Gilad Bracha. The basic idea is | |
2038 // that the system dictionary needs to maintain a set of contraints that | |
2039 // must be satisfied by all classes in the dictionary. | |
2040 // if defining is true, then LinkageError if already in systemDictionary | |
2041 // if initiating loader, then ok if instanceKlass matches existing entry | |
2042 | |
2043 void SystemDictionary::check_constraints(int d_index, unsigned int d_hash, | |
2044 instanceKlassHandle k, | |
2045 Handle class_loader, bool defining, | |
2046 TRAPS) { | |
2047 const char *linkage_error = NULL; | |
2048 { | |
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2049 Symbol* name = k->name(); |
0 | 2050 MutexLocker mu(SystemDictionary_lock, THREAD); |
2051 | |
2052 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
2053 if (check != (klassOop)NULL) { | |
2054 // if different instanceKlass - duplicate class definition, | |
2055 // else - ok, class loaded by a different thread in parallel, | |
2056 // we should only have found it if it was done loading and ok to use | |
2057 // system dictionary only holds instance classes, placeholders | |
2058 // also holds array classes | |
2059 | |
2060 assert(check->klass_part()->oop_is_instance(), "noninstance in systemdictionary"); | |
2061 if ((defining == true) || (k() != check)) { | |
2062 linkage_error = "loader (instance of %s): attempted duplicate class " | |
2063 "definition for name: \"%s\""; | |
2064 } else { | |
2065 return; | |
2066 } | |
2067 } | |
2068 | |
2069 #ifdef ASSERT | |
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2070 Symbol* ph_check = find_placeholder(name, class_loader); |
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2071 assert(ph_check == NULL || ph_check == name, "invalid symbol"); |
0 | 2072 #endif |
2073 | |
2074 if (linkage_error == NULL) { | |
2075 if (constraints()->check_or_update(k, class_loader, name) == false) { | |
2076 linkage_error = "loader constraint violation: loader (instance of %s)" | |
2077 " previously initiated loading for a different type with name \"%s\""; | |
2078 } | |
2079 } | |
2080 } | |
2081 | |
2082 // Throw error now if needed (cannot throw while holding | |
2083 // SystemDictionary_lock because of rank ordering) | |
2084 | |
2085 if (linkage_error) { | |
2086 ResourceMark rm(THREAD); | |
2087 const char* class_loader_name = loader_name(class_loader()); | |
2088 char* type_name = k->name()->as_C_string(); | |
2089 size_t buflen = strlen(linkage_error) + strlen(class_loader_name) + | |
2090 strlen(type_name); | |
2091 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
2092 jio_snprintf(buf, buflen, linkage_error, class_loader_name, type_name); | |
2093 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); | |
2094 } | |
2095 } | |
2096 | |
2097 | |
2098 // Update system dictionary - done after check_constraint and add_to_hierachy | |
2099 // have been called. | |
2100 void SystemDictionary::update_dictionary(int d_index, unsigned int d_hash, | |
2101 int p_index, unsigned int p_hash, | |
2102 instanceKlassHandle k, | |
2103 Handle class_loader, | |
2104 TRAPS) { | |
2105 // Compile_lock prevents systemDictionary updates during compilations | |
2106 assert_locked_or_safepoint(Compile_lock); | |
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2107 Symbol* name = k->name(); |
0 | 2108 |
2109 { | |
2110 MutexLocker mu1(SystemDictionary_lock, THREAD); | |
2111 | |
2112 // See whether biased locking is enabled and if so set it for this | |
2113 // klass. | |
2114 // Note that this must be done past the last potential blocking | |
2115 // point / safepoint. We enable biased locking lazily using a | |
2116 // VM_Operation to iterate the SystemDictionary and installing the | |
2117 // biasable mark word into each instanceKlass's prototype header. | |
2118 // To avoid race conditions where we accidentally miss enabling the | |
2119 // optimization for one class in the process of being added to the | |
2120 // dictionary, we must not safepoint after the test of | |
2121 // BiasedLocking::enabled(). | |
2122 if (UseBiasedLocking && BiasedLocking::enabled()) { | |
2123 // Set biased locking bit for all loaded classes; it will be | |
2124 // cleared if revocation occurs too often for this type | |
2125 // NOTE that we must only do this when the class is initally | |
2126 // defined, not each time it is referenced from a new class loader | |
2127 if (k->class_loader() == class_loader()) { | |
2128 k->set_prototype_header(markOopDesc::biased_locking_prototype()); | |
2129 } | |
2130 } | |
2131 | |
2132 // Check for a placeholder. If there, remove it and make a | |
2133 // new system dictionary entry. | |
2134 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
2135 klassOop sd_check = find_class(d_index, d_hash, name, class_loader); | |
2136 if (sd_check == NULL) { | |
2137 dictionary()->add_klass(name, class_loader, k); | |
2138 notice_modification(); | |
2139 } | |
2140 #ifdef ASSERT | |
2141 sd_check = find_class(d_index, d_hash, name, class_loader); | |
2142 assert (sd_check != NULL, "should have entry in system dictionary"); | |
2143 // Changed to allow PH to remain to complete class circularity checking | |
2144 // while only one thread can define a class at one time, multiple | |
2145 // classes can resolve the superclass for a class at one time, | |
2146 // and the placeholder is used to track that | |
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2147 // Symbol* ph_check = find_placeholder(name, class_loader); |
0 | 2148 // assert (ph_check == NULL, "should not have a placeholder entry"); |
2149 #endif | |
2150 SystemDictionary_lock->notify_all(); | |
2151 } | |
2152 } | |
2153 | |
2154 | |
2155 klassOop SystemDictionary::find_constrained_instance_or_array_klass( | |
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2156 Symbol* class_name, Handle class_loader, TRAPS) { |
0 | 2157 |
2158 // First see if it has been loaded directly. | |
2159 // Force the protection domain to be null. (This removes protection checks.) | |
2160 Handle no_protection_domain; | |
2161 klassOop klass = find_instance_or_array_klass(class_name, class_loader, | |
2162 no_protection_domain, CHECK_NULL); | |
2163 if (klass != NULL) | |
2164 return klass; | |
2165 | |
2166 // Now look to see if it has been loaded elsewhere, and is subject to | |
2167 // a loader constraint that would require this loader to return the | |
2168 // klass that is already loaded. | |
2177
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2169 if (FieldType::is_array(class_name)) { |
1336 | 2170 // For array classes, their klassOops are not kept in the |
2171 // constraint table. The element klassOops are. | |
2177
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2172 FieldArrayInfo fd; |
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2173 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
0 | 2174 if (t != T_OBJECT) { |
2175 klass = Universe::typeArrayKlassObj(t); | |
2176 } else { | |
2177 MutexLocker mu(SystemDictionary_lock, THREAD); | |
2177
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2178 klass = constraints()->find_constrained_klass(fd.object_key(), class_loader); |
0 | 2179 } |
1336 | 2180 // If element class already loaded, allocate array klass |
0 | 2181 if (klass != NULL) { |
2177
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2182 klass = Klass::cast(klass)->array_klass_or_null(fd.dimension()); |
0 | 2183 } |
2184 } else { | |
2185 MutexLocker mu(SystemDictionary_lock, THREAD); | |
2186 // Non-array classes are easy: simply check the constraint table. | |
2187 klass = constraints()->find_constrained_klass(class_name, class_loader); | |
2188 } | |
2189 | |
2190 return klass; | |
2191 } | |
2192 | |
2193 | |
2177
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2194 bool SystemDictionary::add_loader_constraint(Symbol* class_name, |
0 | 2195 Handle class_loader1, |
2196 Handle class_loader2, | |
2197 Thread* THREAD) { | |
2177
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2198 Symbol* constraint_name = NULL; |
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2199 if (!FieldType::is_array(class_name)) { |
1336 | 2200 constraint_name = class_name; |
2201 } else { | |
2202 // For array classes, their klassOops are not kept in the | |
2203 // constraint table. The element classes are. | |
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2204 FieldArrayInfo fd; |
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2205 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(false)); |
1336 | 2206 // primitive types always pass |
2207 if (t != T_OBJECT) { | |
2208 return true; | |
2209 } else { | |
2177
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2210 constraint_name = fd.object_key(); |
1336 | 2211 } |
2212 } | |
2213 unsigned int d_hash1 = dictionary()->compute_hash(constraint_name, class_loader1); | |
0 | 2214 int d_index1 = dictionary()->hash_to_index(d_hash1); |
2215 | |
1336 | 2216 unsigned int d_hash2 = dictionary()->compute_hash(constraint_name, class_loader2); |
0 | 2217 int d_index2 = dictionary()->hash_to_index(d_hash2); |
2218 { | |
1336 | 2219 MutexLocker mu_s(SystemDictionary_lock, THREAD); |
0 | 2220 |
1336 | 2221 // Better never do a GC while we're holding these oops |
2222 No_Safepoint_Verifier nosafepoint; | |
0 | 2223 |
1336 | 2224 klassOop klass1 = find_class(d_index1, d_hash1, constraint_name, class_loader1); |
2225 klassOop klass2 = find_class(d_index2, d_hash2, constraint_name, class_loader2); | |
2226 return constraints()->add_entry(constraint_name, klass1, class_loader1, | |
2227 klass2, class_loader2); | |
0 | 2228 } |
2229 } | |
2230 | |
2231 // Add entry to resolution error table to record the error when the first | |
2232 // attempt to resolve a reference to a class has failed. | |
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2233 void SystemDictionary::add_resolution_error(constantPoolHandle pool, int which, Symbol* error) { |
0 | 2234 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
2235 int index = resolution_errors()->hash_to_index(hash); | |
2236 { | |
2237 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
2238 resolution_errors()->add_entry(index, hash, pool, which, error); | |
2239 } | |
2240 } | |
2241 | |
2242 // Lookup resolution error table. Returns error if found, otherwise NULL. | |
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2243 Symbol* SystemDictionary::find_resolution_error(constantPoolHandle pool, int which) { |
0 | 2244 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
2245 int index = resolution_errors()->hash_to_index(hash); | |
2246 { | |
2247 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
2248 ResolutionErrorEntry* entry = resolution_errors()->find_entry(index, hash, pool, which); | |
2177
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2249 return (entry != NULL) ? entry->error() : (Symbol*)NULL; |
0 | 2250 } |
2251 } | |
2252 | |
2253 | |
665
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2254 // Signature constraints ensure that callers and callees agree about |
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2255 // the meaning of type names in their signatures. This routine is the |
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2256 // intake for constraints. It collects them from several places: |
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2257 // |
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2258 // * LinkResolver::resolve_method (if check_access is true) requires |
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2259 // that the resolving class (the caller) and the defining class of |
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2260 // the resolved method (the callee) agree on each type in the |
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2261 // method's signature. |
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2262 // |
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2263 // * LinkResolver::resolve_interface_method performs exactly the same |
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2264 // checks. |
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2265 // |
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2266 // * LinkResolver::resolve_field requires that the constant pool |
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2267 // attempting to link to a field agree with the field's defining |
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2268 // class about the type of the field signature. |
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2269 // |
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2270 // * klassVtable::initialize_vtable requires that, when a class |
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2271 // overrides a vtable entry allocated by a superclass, that the |
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2272 // overriding method (i.e., the callee) agree with the superclass |
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2273 // on each type in the method's signature. |
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2274 // |
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2275 // * klassItable::initialize_itable requires that, when a class fills |
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2276 // in its itables, for each non-abstract method installed in an |
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2277 // itable, the method (i.e., the callee) agree with the interface |
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2278 // on each type in the method's signature. |
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2279 // |
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2280 // All those methods have a boolean (check_access, checkconstraints) |
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2281 // which turns off the checks. This is used from specialized contexts |
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2282 // such as bootstrapping, dumping, and debugging. |
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2283 // |
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2284 // No direct constraint is placed between the class and its |
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2285 // supertypes. Constraints are only placed along linked relations |
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2286 // between callers and callees. When a method overrides or implements |
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2287 // an abstract method in a supertype (superclass or interface), the |
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2288 // constraints are placed as if the supertype were the caller to the |
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2289 // overriding method. (This works well, since callers to the |
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2290 // supertype have already established agreement between themselves and |
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2291 // the supertype.) As a result of all this, a class can disagree with |
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2292 // its supertype about the meaning of a type name, as long as that |
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2293 // class neither calls a relevant method of the supertype, nor is |
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2294 // called (perhaps via an override) from the supertype. |
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2295 // |
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2296 // |
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2297 // SystemDictionary::check_signature_loaders(sig, l1, l2) |
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2298 // |
0 | 2299 // Make sure all class components (including arrays) in the given |
2300 // signature will be resolved to the same class in both loaders. | |
2301 // Returns the name of the type that failed a loader constraint check, or | |
2302 // NULL if no constraint failed. The returned C string needs cleaning up | |
665
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2303 // with a ResourceMark in the caller. No exception except OOME is thrown. |
1336 | 2304 // Arrays are not added to the loader constraint table, their elements are. |
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2305 char* SystemDictionary::check_signature_loaders(Symbol* signature, |
0 | 2306 Handle loader1, Handle loader2, |
2307 bool is_method, TRAPS) { | |
2308 // Nothing to do if loaders are the same. | |
2309 if (loader1() == loader2()) { | |
2310 return NULL; | |
2311 } | |
2312 | |
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2313 ResourceMark rm(THREAD); |
0 | 2314 SignatureStream sig_strm(signature, is_method); |
2315 while (!sig_strm.is_done()) { | |
2316 if (sig_strm.is_object()) { | |
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2317 Symbol* s = sig_strm.as_symbol(CHECK_NULL); |
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2318 Symbol* sig = s; |
0 | 2319 if (!add_loader_constraint(sig, loader1, loader2, THREAD)) { |
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2320 return sig->as_C_string(); |
0 | 2321 } |
2322 } | |
2323 sig_strm.next(); | |
2324 } | |
2325 return NULL; | |
2326 } | |
2327 | |
2328 | |
2177
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2329 methodOop SystemDictionary::find_method_handle_invoke(Symbol* name, |
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2330 Symbol* signature, |
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2331 KlassHandle accessing_klass, |
710 | 2332 TRAPS) { |
2333 if (!EnableMethodHandles) return NULL; | |
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2334 vmSymbols::SID name_id = vmSymbols::find_sid(name); |
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2335 assert(name_id != vmSymbols::NO_SID, "must be a known name"); |
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2336 unsigned int hash = invoke_method_table()->compute_hash(signature, name_id); |
710 | 2337 int index = invoke_method_table()->hash_to_index(hash); |
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2338 SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, name_id); |
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2339 methodHandle non_cached_result; |
710 | 2340 if (spe == NULL || spe->property_oop() == NULL) { |
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2341 spe = NULL; |
710 | 2342 // Must create lots of stuff here, but outside of the SystemDictionary lock. |
1135
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2343 if (THREAD->is_Compiler_thread()) |
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2344 return NULL; // do not attempt from within compiler |
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2345 bool for_invokeGeneric = (name_id == vmSymbols::VM_SYMBOL_ENUM_NAME(invokeGeneric_name)); |
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2346 bool found_on_bcp = false; |
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2347 Handle mt = find_method_handle_type(signature, accessing_klass, |
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2348 for_invokeGeneric, |
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2349 found_on_bcp, CHECK_NULL); |
710 | 2350 KlassHandle mh_klass = SystemDictionaryHandles::MethodHandle_klass(); |
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2351 methodHandle m = methodOopDesc::make_invoke_method(mh_klass, name, signature, |
710 | 2352 mt, CHECK_NULL); |
2353 // Now grab the lock. We might have to throw away the new method, | |
2354 // if a racing thread has managed to install one at the same time. | |
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2355 if (found_on_bcp) { |
710 | 2356 MutexLocker ml(SystemDictionary_lock, Thread::current()); |
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2357 spe = invoke_method_table()->find_entry(index, hash, signature, name_id); |
710 | 2358 if (spe == NULL) |
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2359 spe = invoke_method_table()->add_entry(index, hash, signature, name_id); |
710 | 2360 if (spe->property_oop() == NULL) |
2361 spe->set_property_oop(m()); | |
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2362 } else { |
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2363 non_cached_result = m; |
710 | 2364 } |
2365 } | |
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2366 if (spe != NULL && spe->property_oop() != NULL) { |
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2367 assert(spe->property_oop()->is_method(), ""); |
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2368 return (methodOop) spe->property_oop(); |
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2369 } else { |
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2370 return non_cached_result(); |
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2371 } |
710 | 2372 } |
2373 | |
2374 // Ask Java code to find or construct a java.dyn.MethodType for the given | |
2375 // signature, as interpreted relative to the given class loader. | |
2376 // Because of class loader constraints, all method handle usage must be | |
2377 // consistent with this loader. | |
2177
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2378 Handle SystemDictionary::find_method_handle_type(Symbol* signature, |
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|
2379 KlassHandle accessing_klass, |
1793
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|
2380 bool for_invokeGeneric, |
1508
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|
2381 bool& return_bcp_flag, |
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2382 TRAPS) { |
1508
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|
2383 Handle class_loader, protection_domain; |
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2384 bool is_on_bcp = true; // keep this true as long as we can materialize from the boot classloader |
710 | 2385 Handle empty; |
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2386 int npts = ArgumentCount(signature).size(); |
1142 | 2387 objArrayHandle pts = oopFactory::new_objArray(SystemDictionary::Class_klass(), npts, CHECK_(empty)); |
710 | 2388 int arg = 0; |
2389 Handle rt; // the return type from the signature | |
2177
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2390 ResourceMark rm(THREAD); |
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2391 for (SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
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2392 oop mirror = NULL; |
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2393 if (is_on_bcp) { |
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2394 mirror = ss.as_java_mirror(class_loader, protection_domain, |
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2395 SignatureStream::ReturnNull, CHECK_(empty)); |
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2396 if (mirror == NULL) { |
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|
2397 // fall back from BCP to accessing_klass |
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|
2398 if (accessing_klass.not_null()) { |
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2399 class_loader = Handle(THREAD, instanceKlass::cast(accessing_klass())->class_loader()); |
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2400 protection_domain = Handle(THREAD, instanceKlass::cast(accessing_klass())->protection_domain()); |
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|
2401 } |
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|
2402 is_on_bcp = false; |
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|
2403 } |
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|
2404 } |
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|
2405 if (!is_on_bcp) { |
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|
2406 // Resolve, throwing a real error if it doesn't work. |
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2407 mirror = ss.as_java_mirror(class_loader, protection_domain, |
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2408 SignatureStream::NCDFError, CHECK_(empty)); |
710 | 2409 } |
2410 if (ss.at_return_type()) | |
2411 rt = Handle(THREAD, mirror); | |
2412 else | |
2413 pts->obj_at_put(arg++, mirror); | |
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2414 // Check accessibility. |
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2415 if (ss.is_object() && accessing_klass.not_null()) { |
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2416 klassOop sel_klass = java_lang_Class::as_klassOop(mirror); |
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2417 // Emulate constantPoolOopDesc::verify_constant_pool_resolve. |
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2418 if (Klass::cast(sel_klass)->oop_is_objArray()) |
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2419 sel_klass = objArrayKlass::cast(sel_klass)->bottom_klass(); |
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2420 if (Klass::cast(sel_klass)->oop_is_instance()) { |
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2421 KlassHandle sel_kh(THREAD, sel_klass); |
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|
2422 LinkResolver::check_klass_accessability(accessing_klass, sel_kh, CHECK_(empty)); |
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|
2423 } |
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|
2424 } |
710 | 2425 } |
2426 assert(arg == npts, ""); | |
2427 | |
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|
2428 // call sun.dyn.MethodHandleNatives::findMethodType(Class rt, Class[] pts) -> MethodType |
710 | 2429 JavaCallArguments args(Handle(THREAD, rt())); |
2430 args.push_oop(pts()); | |
2431 JavaValue result(T_OBJECT); | |
2432 JavaCalls::call_static(&result, | |
1507
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|
2433 SystemDictionary::MethodHandleNatives_klass(), |
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changeset
|
2434 vmSymbols::findMethodHandleType_name(), |
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diff
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|
2435 vmSymbols::findMethodHandleType_signature(), |
710 | 2436 &args, CHECK_(empty)); |
1793
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6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
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|
2437 Handle method_type(THREAD, (oop) result.get_jobject()); |
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|
2438 |
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
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|
2439 if (for_invokeGeneric) { |
d257356e35f0
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diff
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|
2440 // call sun.dyn.MethodHandleNatives::notifyGenericMethodType(MethodType) -> void |
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
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1660
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|
2441 JavaCallArguments args(Handle(THREAD, method_type())); |
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diff
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|
2442 JavaValue no_result(T_VOID); |
d257356e35f0
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jrose
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1660
diff
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|
2443 JavaCalls::call_static(&no_result, |
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
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diff
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|
2444 SystemDictionary::MethodHandleNatives_klass(), |
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
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1660
diff
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|
2445 vmSymbols::notifyGenericMethodType_name(), |
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
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1660
diff
changeset
|
2446 vmSymbols::notifyGenericMethodType_signature(), |
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
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1660
diff
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|
2447 &args, THREAD); |
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
changeset
|
2448 if (HAS_PENDING_EXCEPTION) { |
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
changeset
|
2449 // 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
|
2450 CLEAR_PENDING_EXCEPTION; |
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
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1660
diff
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|
2451 } |
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
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1660
diff
changeset
|
2452 } |
1508
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diff
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|
2453 |
2ffde6cfe049
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diff
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|
2454 // report back to the caller with the MethodType and the "on_bcp" flag |
2ffde6cfe049
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1507
diff
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|
2455 return_bcp_flag = is_on_bcp; |
1793
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
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1660
diff
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|
2456 return method_type; |
710 | 2457 } |
2458 | |
1602 | 2459 // Ask Java code to find or construct a method handle constant. |
2460 Handle SystemDictionary::link_method_handle_constant(KlassHandle caller, | |
2461 int ref_kind, //e.g., JVM_REF_invokeVirtual | |
2462 KlassHandle callee, | |
2177
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2001
diff
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|
2463 Symbol* name_sym, |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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2001
diff
changeset
|
2464 Symbol* signature, |
1602 | 2465 TRAPS) { |
2466 Handle empty; | |
2177
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2001
diff
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|
2467 Handle name = java_lang_String::create_from_symbol(name_sym, CHECK_(empty)); |
1602 | 2468 Handle type; |
2469 if (signature->utf8_length() > 0 && signature->byte_at(0) == '(') { | |
2470 bool ignore_is_on_bcp = false; | |
1793
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
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|
2471 type = find_method_handle_type(signature, caller, false, ignore_is_on_bcp, CHECK_(empty)); |
1602 | 2472 } else { |
2177
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2001
diff
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|
2473 ResourceMark rm(THREAD); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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2001
diff
changeset
|
2474 SignatureStream ss(signature, false); |
1602 | 2475 if (!ss.is_done()) { |
2476 oop mirror = ss.as_java_mirror(caller->class_loader(), caller->protection_domain(), | |
2477 SignatureStream::NCDFError, CHECK_(empty)); | |
2478 type = Handle(THREAD, mirror); | |
2479 ss.next(); | |
2480 if (!ss.is_done()) type = Handle(); // error! | |
2481 } | |
2482 } | |
2483 if (type.is_null()) { | |
2484 THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad signature", empty); | |
2485 } | |
2486 | |
2487 // call sun.dyn.MethodHandleNatives::linkMethodHandleConstant(Class caller, int refKind, Class callee, String name, Object type) -> MethodHandle | |
2488 JavaCallArguments args; | |
2489 args.push_oop(caller->java_mirror()); // the referring class | |
2490 args.push_int(ref_kind); | |
2491 args.push_oop(callee->java_mirror()); // the target class | |
2492 args.push_oop(name()); | |
2493 args.push_oop(type()); | |
2494 JavaValue result(T_OBJECT); | |
2495 JavaCalls::call_static(&result, | |
2496 SystemDictionary::MethodHandleNatives_klass(), | |
2497 vmSymbols::linkMethodHandleConstant_name(), | |
2498 vmSymbols::linkMethodHandleConstant_signature(), | |
2499 &args, CHECK_(empty)); | |
2500 return Handle(THREAD, (oop) result.get_jobject()); | |
2501 } | |
710 | 2502 |
726
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6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2503 // Ask Java code to find or construct a java.dyn.CallSite for the given |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2504 // name and signature, as interpreted relative to the given class loader. |
1507
cd5dbf694d45
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jrose
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1339
diff
changeset
|
2505 Handle SystemDictionary::make_dynamic_call_site(Handle bootstrap_method, |
2177
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6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2506 Symbol* name, |
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2507 methodHandle signature_invoker, |
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2508 Handle info, |
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2509 methodHandle caller_method, |
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2510 int caller_bci, |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2511 TRAPS) { |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2512 Handle empty; |
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2513 guarantee(bootstrap_method.not_null() && |
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2514 java_dyn_MethodHandle::is_instance(bootstrap_method()), |
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2515 "caller must supply a valid BSM"); |
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2516 |
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
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1339
diff
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|
2517 Handle caller_mname = MethodHandles::new_MemberName(CHECK_(empty)); |
cd5dbf694d45
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jrose
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1339
diff
changeset
|
2518 MethodHandles::init_MemberName(caller_mname(), caller_method()); |
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
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1339
diff
changeset
|
2519 |
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
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1339
diff
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|
2520 // call sun.dyn.MethodHandleNatives::makeDynamicCallSite(bootm, name, mtype, info, caller_mname, caller_pos) |
2177
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diff
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|
2521 oop name_str_oop = StringTable::intern(name, CHECK_(empty)); // not a handle! |
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
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1339
diff
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|
2522 JavaCallArguments args(Handle(THREAD, bootstrap_method())); |
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2523 args.push_oop(name_str_oop); |
1507
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jrose
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1339
diff
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|
2524 args.push_oop(signature_invoker->method_handle_type()); |
cd5dbf694d45
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jrose
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1339
diff
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|
2525 args.push_oop(info()); |
cd5dbf694d45
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jrose
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1339
diff
changeset
|
2526 args.push_oop(caller_mname()); |
726
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6655646: dynamic languages need dynamically linked call sites
jrose
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710
diff
changeset
|
2527 args.push_int(caller_bci); |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
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710
diff
changeset
|
2528 JavaValue result(T_OBJECT); |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2529 JavaCalls::call_static(&result, |
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
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1339
diff
changeset
|
2530 SystemDictionary::MethodHandleNatives_klass(), |
cd5dbf694d45
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jrose
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1339
diff
changeset
|
2531 vmSymbols::makeDynamicCallSite_name(), |
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
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1339
diff
changeset
|
2532 vmSymbols::makeDynamicCallSite_signature(), |
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
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710
diff
changeset
|
2533 &args, CHECK_(empty)); |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
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710
diff
changeset
|
2534 oop call_site_oop = (oop) result.get_jobject(); |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
875
diff
changeset
|
2535 assert(call_site_oop->is_oop() |
1059
389049f3f393
6858164: invokedynamic code needs some cleanup (post-6655638)
jrose
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1039
diff
changeset
|
2536 /*&& java_dyn_CallSite::is_instance(call_site_oop)*/, "must be sane"); |
726
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jrose
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710
diff
changeset
|
2537 if (TraceMethodHandles) { |
1059
389049f3f393
6858164: invokedynamic code needs some cleanup (post-6655638)
jrose
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1039
diff
changeset
|
2538 #ifndef PRODUCT |
726
be93aad57795
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jrose
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710
diff
changeset
|
2539 tty->print_cr("Linked invokedynamic bci=%d site="INTPTR_FORMAT":", caller_bci, call_site_oop); |
be93aad57795
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jrose
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diff
changeset
|
2540 call_site_oop->print(); |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
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710
diff
changeset
|
2541 tty->cr(); |
1059
389049f3f393
6858164: invokedynamic code needs some cleanup (post-6655638)
jrose
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1039
diff
changeset
|
2542 #endif //PRODUCT |
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
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710
diff
changeset
|
2543 } |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2544 return call_site_oop; |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2545 } |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
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diff
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|
2546 |
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2547 Handle SystemDictionary::find_bootstrap_method(methodHandle caller_method, int caller_bci, |
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2548 int cache_index, |
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|
2549 Handle& argument_info_result, |
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|
2550 TRAPS) { |
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2551 Handle empty; |
1660
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|
2552 |
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2553 constantPoolHandle pool; |
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2554 { |
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2555 klassOop caller = caller_method->method_holder(); |
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2556 if (!Klass::cast(caller)->oop_is_instance()) return empty; |
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2557 pool = constantPoolHandle(THREAD, instanceKlass::cast(caller)->constants()); |
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2558 } |
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|
2559 |
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2560 int constant_pool_index = pool->cache()->entry_at(cache_index)->constant_pool_index(); |
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2561 constantTag tag = pool->tag_at(constant_pool_index); |
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2562 |
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2563 if (tag.is_invoke_dynamic()) { |
1913
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2564 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments |
1660
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2565 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry. |
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2566 int bsm_index = pool->invoke_dynamic_bootstrap_method_ref_index_at(constant_pool_index); |
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2567 if (bsm_index != 0) { |
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2568 int bsm_index_in_cache = pool->cache()->entry_at(cache_index)->bootstrap_method_index_in_cache(); |
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2569 DEBUG_ONLY(int bsm_index_2 = pool->cache()->entry_at(bsm_index_in_cache)->constant_pool_index()); |
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2570 assert(bsm_index == bsm_index_2, "BSM constant lifted to cache"); |
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2571 if (TraceMethodHandles) { |
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2572 tty->print_cr("resolving bootstrap method for "PTR_FORMAT" at %d at cache[%d]CP[%d]...", |
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2573 (intptr_t) caller_method(), caller_bci, cache_index, constant_pool_index); |
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2574 } |
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2575 oop bsm_oop = pool->resolve_cached_constant_at(bsm_index_in_cache, CHECK_(empty)); |
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2576 if (TraceMethodHandles) { |
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2577 tty->print_cr("bootstrap method for "PTR_FORMAT" at %d retrieved as "PTR_FORMAT":", |
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2578 (intptr_t) caller_method(), caller_bci, (intptr_t) bsm_oop); |
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|
2579 } |
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2580 assert(bsm_oop->is_oop(), "must be sane"); |
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2581 // caller must verify that it is of type MethodHandle |
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|
2582 Handle bsm(THREAD, bsm_oop); |
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|
2583 bsm_oop = NULL; // safety |
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|
2584 |
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|
2585 // Extract the optional static arguments. |
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|
2586 Handle argument_info; // either null, or one arg, or Object[]{arg...} |
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2587 int argc = pool->invoke_dynamic_argument_count_at(constant_pool_index); |
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|
2588 if (TraceInvokeDynamic) { |
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|
2589 tty->print_cr("find_bootstrap_method: [%d/%d] CONSTANT_InvokeDynamic: %d[%d]", |
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2590 constant_pool_index, cache_index, bsm_index, argc); |
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|
2591 } |
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|
2592 if (argc > 0) { |
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|
2593 objArrayHandle arg_array; |
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|
2594 if (argc > 1) { |
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|
2595 objArrayOop arg_array_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), argc, CHECK_(empty)); |
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2596 arg_array = objArrayHandle(THREAD, arg_array_oop); |
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|
2597 argument_info = arg_array; |
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|
2598 } |
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|
2599 for (int arg_i = 0; arg_i < argc; arg_i++) { |
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2600 int arg_index = pool->invoke_dynamic_argument_index_at(constant_pool_index, arg_i); |
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2601 oop arg_oop = pool->resolve_possibly_cached_constant_at(arg_index, CHECK_(empty)); |
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2602 if (arg_array.is_null()) { |
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|
2603 argument_info = Handle(THREAD, arg_oop); |
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|
2604 } else { |
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2605 arg_array->obj_at_put(arg_i, arg_oop); |
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|
2606 } |
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|
2607 } |
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|
2608 } |
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|
2609 |
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2610 argument_info_result = argument_info; // return argument_info to caller |
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|
2611 return bsm; |
1660
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|
2612 } |
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2613 // else null BSM; fall through |
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|
2614 } else if (tag.is_name_and_type()) { |
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2615 // JSR 292 EDR does not have JVM_CONSTANT_InvokeDynamic |
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2616 // a bare name&type defaults its BSM to null, so fall through... |
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|
2617 } else { |
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|
2618 ShouldNotReachHere(); // verifier does not allow this |
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|
2619 } |
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|
2620 |
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|
2621 // Fall through to pick up the per-class bootstrap method. |
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|
2622 // This mechanism may go away in the PFD. |
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|
2623 assert(AllowTransitionalJSR292, "else the verifier should have stopped us already"); |
1913
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2624 argument_info_result = empty; // return no argument_info to caller |
1660
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|
2625 oop bsm_oop = instanceKlass::cast(caller_method->method_holder())->bootstrap_method(); |
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2626 if (bsm_oop != NULL) { |
1059
389049f3f393
6858164: invokedynamic code needs some cleanup (post-6655638)
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diff
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|
2627 if (TraceMethodHandles) { |
1660
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|
2628 tty->print_cr("bootstrap method for "PTR_FORMAT" registered as "PTR_FORMAT":", |
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|
2629 (intptr_t) caller_method(), (intptr_t) bsm_oop); |
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|
2630 } |
1913
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|
2631 assert(bsm_oop->is_oop(), "must be sane"); |
1660
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|
2632 return Handle(THREAD, bsm_oop); |
726
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|
2633 } |
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diff
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|
2634 |
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
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1339
diff
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|
2635 return empty; |
726
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|
2636 } |
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diff
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|
2637 |
0 | 2638 // Since the identity hash code for symbols changes when the symbols are |
2639 // moved from the regular perm gen (hash in the mark word) to the shared | |
2640 // spaces (hash is the address), the classes loaded into the dictionary | |
2641 // may be in the wrong buckets. | |
2642 | |
2643 void SystemDictionary::reorder_dictionary() { | |
2644 dictionary()->reorder_dictionary(); | |
2645 } | |
2646 | |
2647 | |
2648 void SystemDictionary::copy_buckets(char** top, char* end) { | |
2649 dictionary()->copy_buckets(top, end); | |
2650 } | |
2651 | |
2652 | |
2653 void SystemDictionary::copy_table(char** top, char* end) { | |
2654 dictionary()->copy_table(top, end); | |
2655 } | |
2656 | |
2657 | |
2658 void SystemDictionary::reverse() { | |
2659 dictionary()->reverse(); | |
2660 } | |
2661 | |
2662 int SystemDictionary::number_of_classes() { | |
2663 return dictionary()->number_of_entries(); | |
2664 } | |
2665 | |
2666 | |
2667 // ---------------------------------------------------------------------------- | |
2668 #ifndef PRODUCT | |
2669 | |
2670 void SystemDictionary::print() { | |
2671 dictionary()->print(); | |
2672 | |
2673 // Placeholders | |
2674 GCMutexLocker mu(SystemDictionary_lock); | |
2675 placeholders()->print(); | |
2676 | |
2677 // loader constraints - print under SD_lock | |
2678 constraints()->print(); | |
2679 } | |
2680 | |
2681 #endif | |
2682 | |
2683 void SystemDictionary::verify() { | |
2684 guarantee(dictionary() != NULL, "Verify of system dictionary failed"); | |
2685 guarantee(constraints() != NULL, | |
2686 "Verify of loader constraints failed"); | |
2687 guarantee(dictionary()->number_of_entries() >= 0 && | |
2688 placeholders()->number_of_entries() >= 0, | |
2689 "Verify of system dictionary failed"); | |
2690 | |
2691 // Verify dictionary | |
2692 dictionary()->verify(); | |
2693 | |
2694 GCMutexLocker mu(SystemDictionary_lock); | |
2695 placeholders()->verify(); | |
2696 | |
2697 // Verify constraint table | |
2698 guarantee(constraints() != NULL, "Verify of loader constraints failed"); | |
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1142
diff
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|
2699 constraints()->verify(dictionary(), placeholders()); |
0 | 2700 } |
2701 | |
2702 | |
2703 void SystemDictionary::verify_obj_klass_present(Handle obj, | |
2177
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|
2704 Symbol* class_name, |
0 | 2705 Handle class_loader) { |
2706 GCMutexLocker mu(SystemDictionary_lock); | |
2177
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|
2707 Symbol* name; |
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diff
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|
2708 |
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diff
changeset
|
2709 klassOop probe = find_class(class_name, class_loader); |
0 | 2710 if (probe == NULL) { |
2711 probe = SystemDictionary::find_shared_class(class_name); | |
2177
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|
2712 if (probe == NULL) { |
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diff
changeset
|
2713 name = find_placeholder(class_name, class_loader); |
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diff
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|
2714 } |
0 | 2715 } |
2177
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|
2716 guarantee(probe != NULL || name != NULL, |
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|
2717 "Loaded klasses should be in SystemDictionary"); |
0 | 2718 } |
2719 | |
2720 #ifndef PRODUCT | |
2721 | |
2722 // statistics code | |
2723 class ClassStatistics: AllStatic { | |
2724 private: | |
2725 static int nclasses; // number of classes | |
2726 static int nmethods; // number of methods | |
2727 static int nmethoddata; // number of methodData | |
2728 static int class_size; // size of class objects in words | |
2729 static int method_size; // size of method objects in words | |
2730 static int debug_size; // size of debug info in methods | |
2731 static int methoddata_size; // size of methodData objects in words | |
2732 | |
2733 static void do_class(klassOop k) { | |
2734 nclasses++; | |
2735 class_size += k->size(); | |
2736 if (k->klass_part()->oop_is_instance()) { | |
2737 instanceKlass* ik = (instanceKlass*)k->klass_part(); | |
2738 class_size += ik->methods()->size(); | |
2739 class_size += ik->constants()->size(); | |
2740 class_size += ik->local_interfaces()->size(); | |
2741 class_size += ik->transitive_interfaces()->size(); | |
2742 // We do not have to count implementors, since we only store one! | |
2743 class_size += ik->fields()->size(); | |
2744 } | |
2745 } | |
2746 | |
2747 static void do_method(methodOop m) { | |
2748 nmethods++; | |
2749 method_size += m->size(); | |
2750 // class loader uses same objArray for empty vectors, so don't count these | |
2751 if (m->exception_table()->length() != 0) method_size += m->exception_table()->size(); | |
2752 if (m->has_stackmap_table()) { | |
2753 method_size += m->stackmap_data()->size(); | |
2754 } | |
2755 | |
2756 methodDataOop mdo = m->method_data(); | |
2757 if (mdo != NULL) { | |
2758 nmethoddata++; | |
2759 methoddata_size += mdo->size(); | |
2760 } | |
2761 } | |
2762 | |
2763 public: | |
2764 static void print() { | |
2765 SystemDictionary::classes_do(do_class); | |
2766 SystemDictionary::methods_do(do_method); | |
2767 tty->print_cr("Class statistics:"); | |
2768 tty->print_cr("%d classes (%d bytes)", nclasses, class_size * oopSize); | |
2769 tty->print_cr("%d methods (%d bytes = %d base + %d debug info)", nmethods, | |
2770 (method_size + debug_size) * oopSize, method_size * oopSize, debug_size * oopSize); | |
2771 tty->print_cr("%d methoddata (%d bytes)", nmethoddata, methoddata_size * oopSize); | |
2772 } | |
2773 }; | |
2774 | |
2775 | |
2776 int ClassStatistics::nclasses = 0; | |
2777 int ClassStatistics::nmethods = 0; | |
2778 int ClassStatistics::nmethoddata = 0; | |
2779 int ClassStatistics::class_size = 0; | |
2780 int ClassStatistics::method_size = 0; | |
2781 int ClassStatistics::debug_size = 0; | |
2782 int ClassStatistics::methoddata_size = 0; | |
2783 | |
2784 void SystemDictionary::print_class_statistics() { | |
2785 ResourceMark rm; | |
2786 ClassStatistics::print(); | |
2787 } | |
2788 | |
2789 | |
2790 class MethodStatistics: AllStatic { | |
2791 public: | |
2792 enum { | |
2793 max_parameter_size = 10 | |
2794 }; | |
2795 private: | |
2796 | |
2797 static int _number_of_methods; | |
2798 static int _number_of_final_methods; | |
2799 static int _number_of_static_methods; | |
2800 static int _number_of_native_methods; | |
2801 static int _number_of_synchronized_methods; | |
2802 static int _number_of_profiled_methods; | |
2803 static int _number_of_bytecodes; | |
2804 static int _parameter_size_profile[max_parameter_size]; | |
2805 static int _bytecodes_profile[Bytecodes::number_of_java_codes]; | |
2806 | |
2807 static void initialize() { | |
2808 _number_of_methods = 0; | |
2809 _number_of_final_methods = 0; | |
2810 _number_of_static_methods = 0; | |
2811 _number_of_native_methods = 0; | |
2812 _number_of_synchronized_methods = 0; | |
2813 _number_of_profiled_methods = 0; | |
2814 _number_of_bytecodes = 0; | |
2815 for (int i = 0; i < max_parameter_size ; i++) _parameter_size_profile[i] = 0; | |
2816 for (int j = 0; j < Bytecodes::number_of_java_codes; j++) _bytecodes_profile [j] = 0; | |
2817 }; | |
2818 | |
2819 static void do_method(methodOop m) { | |
2820 _number_of_methods++; | |
2821 // collect flag info | |
2822 if (m->is_final() ) _number_of_final_methods++; | |
2823 if (m->is_static() ) _number_of_static_methods++; | |
2824 if (m->is_native() ) _number_of_native_methods++; | |
2825 if (m->is_synchronized()) _number_of_synchronized_methods++; | |
2826 if (m->method_data() != NULL) _number_of_profiled_methods++; | |
2827 // collect parameter size info (add one for receiver, if any) | |
2828 _parameter_size_profile[MIN2(m->size_of_parameters() + (m->is_static() ? 0 : 1), max_parameter_size - 1)]++; | |
2829 // collect bytecodes info | |
2830 { | |
2831 Thread *thread = Thread::current(); | |
2832 HandleMark hm(thread); | |
2833 BytecodeStream s(methodHandle(thread, m)); | |
2834 Bytecodes::Code c; | |
2835 while ((c = s.next()) >= 0) { | |
2836 _number_of_bytecodes++; | |
2837 _bytecodes_profile[c]++; | |
2838 } | |
2839 } | |
2840 } | |
2841 | |
2842 public: | |
2843 static void print() { | |
2844 initialize(); | |
2845 SystemDictionary::methods_do(do_method); | |
2846 // generate output | |
2847 tty->cr(); | |
2848 tty->print_cr("Method statistics (static):"); | |
2849 // flag distribution | |
2850 tty->cr(); | |
2851 tty->print_cr("%6d final methods %6.1f%%", _number_of_final_methods , _number_of_final_methods * 100.0F / _number_of_methods); | |
2852 tty->print_cr("%6d static methods %6.1f%%", _number_of_static_methods , _number_of_static_methods * 100.0F / _number_of_methods); | |
2853 tty->print_cr("%6d native methods %6.1f%%", _number_of_native_methods , _number_of_native_methods * 100.0F / _number_of_methods); | |
2854 tty->print_cr("%6d synchronized methods %6.1f%%", _number_of_synchronized_methods, _number_of_synchronized_methods * 100.0F / _number_of_methods); | |
2855 tty->print_cr("%6d profiled methods %6.1f%%", _number_of_profiled_methods, _number_of_profiled_methods * 100.0F / _number_of_methods); | |
2856 // parameter size profile | |
2857 tty->cr(); | |
2858 { int tot = 0; | |
2859 int avg = 0; | |
2860 for (int i = 0; i < max_parameter_size; i++) { | |
2861 int n = _parameter_size_profile[i]; | |
2862 tot += n; | |
2863 avg += n*i; | |
2864 tty->print_cr("parameter size = %1d: %6d methods %5.1f%%", i, n, n * 100.0F / _number_of_methods); | |
2865 } | |
2866 assert(tot == _number_of_methods, "should be the same"); | |
2867 tty->print_cr(" %6d methods 100.0%%", _number_of_methods); | |
2868 tty->print_cr("(average parameter size = %3.1f including receiver, if any)", (float)avg / _number_of_methods); | |
2869 } | |
2870 // bytecodes profile | |
2871 tty->cr(); | |
2872 { int tot = 0; | |
2873 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) { | |
2874 if (Bytecodes::is_defined(i)) { | |
2875 Bytecodes::Code c = Bytecodes::cast(i); | |
2876 int n = _bytecodes_profile[c]; | |
2877 tot += n; | |
2878 tty->print_cr("%9d %7.3f%% %s", n, n * 100.0F / _number_of_bytecodes, Bytecodes::name(c)); | |
2879 } | |
2880 } | |
2881 assert(tot == _number_of_bytecodes, "should be the same"); | |
2882 tty->print_cr("%9d 100.000%%", _number_of_bytecodes); | |
2883 } | |
2884 tty->cr(); | |
2885 } | |
2886 }; | |
2887 | |
2888 int MethodStatistics::_number_of_methods; | |
2889 int MethodStatistics::_number_of_final_methods; | |
2890 int MethodStatistics::_number_of_static_methods; | |
2891 int MethodStatistics::_number_of_native_methods; | |
2892 int MethodStatistics::_number_of_synchronized_methods; | |
2893 int MethodStatistics::_number_of_profiled_methods; | |
2894 int MethodStatistics::_number_of_bytecodes; | |
2895 int MethodStatistics::_parameter_size_profile[MethodStatistics::max_parameter_size]; | |
2896 int MethodStatistics::_bytecodes_profile[Bytecodes::number_of_java_codes]; | |
2897 | |
2898 | |
2899 void SystemDictionary::print_method_statistics() { | |
2900 MethodStatistics::print(); | |
2901 } | |
2902 | |
2903 #endif // PRODUCT |