Mercurial > hg > truffle
annotate src/share/vm/classfile/systemDictionary.cpp @ 16704:3cd605c98060
NFI: cleanup
author | Matthias Grimmer <grimmer@ssw.jku.at> |
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date | Wed, 06 Aug 2014 08:27:42 +0200 |
parents | fcb186b03c8b |
children | 89152779163c |
rev | line source |
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0 | 1 /* |
14909 | 2 * Copyright (c) 1997, 2013, 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" |
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26 #include "classfile/classLoaderData.inline.hpp" |
1972 | 27 #include "classfile/dictionary.hpp" |
28 #include "classfile/javaClasses.hpp" | |
29 #include "classfile/loaderConstraints.hpp" | |
30 #include "classfile/placeholders.hpp" | |
31 #include "classfile/resolutionErrors.hpp" | |
32 #include "classfile/systemDictionary.hpp" | |
33 #include "classfile/vmSymbols.hpp" | |
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34 #include "compiler/compileBroker.hpp" |
1972 | 35 #include "interpreter/bytecodeStream.hpp" |
36 #include "interpreter/interpreter.hpp" | |
37 #include "memory/gcLocker.hpp" | |
38 #include "memory/oopFactory.hpp" | |
39 #include "oops/instanceKlass.hpp" | |
40 #include "oops/instanceRefKlass.hpp" | |
41 #include "oops/klass.inline.hpp" | |
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42 #include "oops/methodData.hpp" |
1972 | 43 #include "oops/objArrayKlass.hpp" |
44 #include "oops/oop.inline.hpp" | |
45 #include "oops/oop.inline2.hpp" | |
46 #include "oops/typeArrayKlass.hpp" | |
47 #include "prims/jvmtiEnvBase.hpp" | |
48 #include "prims/methodHandles.hpp" | |
49 #include "runtime/biasedLocking.hpp" | |
50 #include "runtime/fieldType.hpp" | |
51 #include "runtime/handles.inline.hpp" | |
52 #include "runtime/java.hpp" | |
53 #include "runtime/javaCalls.hpp" | |
54 #include "runtime/mutexLocker.hpp" | |
55 #include "runtime/signature.hpp" | |
56 #include "services/classLoadingService.hpp" | |
57 #include "services/threadService.hpp" | |
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58 #include "utilities/macros.hpp" |
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59 #include "utilities/ticks.hpp" |
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60 #ifdef GRAAL |
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61 #include "graal/graalRuntime.hpp" |
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62 #endif |
0 | 63 |
10405 | 64 #if INCLUDE_TRACE |
65 #include "trace/tracing.hpp" | |
66 #endif | |
67 | |
1903 | 68 Dictionary* SystemDictionary::_dictionary = NULL; |
69 PlaceholderTable* SystemDictionary::_placeholders = NULL; | |
70 Dictionary* SystemDictionary::_shared_dictionary = NULL; | |
71 LoaderConstraintTable* SystemDictionary::_loader_constraints = NULL; | |
72 ResolutionErrorTable* SystemDictionary::_resolution_errors = NULL; | |
73 SymbolPropertyTable* SystemDictionary::_invoke_method_table = NULL; | |
0 | 74 |
75 | |
76 int SystemDictionary::_number_of_modifications = 0; | |
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77 int SystemDictionary::_sdgeneration = 0; |
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78 const int SystemDictionary::_primelist[_prime_array_size] = {1009,2017,4049,5051,10103, |
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79 20201,40423,99991}; |
0 | 80 |
81 oop SystemDictionary::_system_loader_lock_obj = NULL; | |
82 | |
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83 Klass* SystemDictionary::_well_known_klasses[SystemDictionary::WKID_LIMIT] |
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84 = { NULL /*, NULL...*/ }; |
0 | 85 |
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86 Klass* SystemDictionary::_box_klasses[T_VOID+1] = { NULL /*, NULL...*/ }; |
0 | 87 |
88 oop SystemDictionary::_java_system_loader = NULL; | |
89 | |
90 bool SystemDictionary::_has_loadClassInternal = false; | |
91 bool SystemDictionary::_has_checkPackageAccess = false; | |
92 | |
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93 #ifdef GRAAL |
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94 oop SystemDictionary::_graal_loader = NULL; |
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95 |
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96 oop SystemDictionary::graal_loader() { |
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97 return _graal_loader; |
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98 } |
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99 #endif |
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100 |
0 | 101 // lazily initialized klass variables |
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102 Klass* volatile SystemDictionary::_abstract_ownable_synchronizer_klass = NULL; |
0 | 103 |
104 | |
105 // ---------------------------------------------------------------------------- | |
106 // Java-level SystemLoader | |
107 | |
108 oop SystemDictionary::java_system_loader() { | |
109 return _java_system_loader; | |
110 } | |
111 | |
112 void SystemDictionary::compute_java_system_loader(TRAPS) { | |
1142 | 113 KlassHandle system_klass(THREAD, WK_KLASS(ClassLoader_klass)); |
0 | 114 JavaValue result(T_OBJECT); |
115 JavaCalls::call_static(&result, | |
1142 | 116 KlassHandle(THREAD, WK_KLASS(ClassLoader_klass)), |
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117 vmSymbols::getSystemClassLoader_name(), |
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118 vmSymbols::void_classloader_signature(), |
0 | 119 CHECK); |
120 | |
121 _java_system_loader = (oop)result.get_jobject(); | |
122 } | |
123 | |
124 | |
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125 ClassLoaderData* SystemDictionary::register_loader(Handle class_loader, TRAPS) { |
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126 if (class_loader() == NULL) return ClassLoaderData::the_null_class_loader_data(); |
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127 return ClassLoaderDataGraph::find_or_create(class_loader, CHECK_NULL); |
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128 } |
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129 |
0 | 130 // ---------------------------------------------------------------------------- |
131 // debugging | |
132 | |
133 #ifdef ASSERT | |
134 | |
135 // return true if class_name contains no '.' (internal format is '/') | |
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136 bool SystemDictionary::is_internal_format(Symbol* class_name) { |
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137 if (class_name != NULL) { |
0 | 138 ResourceMark rm; |
139 char* name = class_name->as_C_string(); | |
140 return strchr(name, '.') == NULL; | |
141 } else { | |
142 return true; | |
143 } | |
144 } | |
145 | |
146 #endif | |
147 | |
148 // ---------------------------------------------------------------------------- | |
514 | 149 // Parallel class loading check |
150 | |
151 bool SystemDictionary::is_parallelCapable(Handle class_loader) { | |
152 if (UnsyncloadClass || class_loader.is_null()) return true; | |
153 if (AlwaysLockClassLoader) return false; | |
3938 | 154 return java_lang_ClassLoader::parallelCapable(class_loader()); |
514 | 155 } |
156 // ---------------------------------------------------------------------------- | |
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157 // ParallelDefineClass flag does not apply to bootclass loader |
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158 bool SystemDictionary::is_parallelDefine(Handle class_loader) { |
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159 if (class_loader.is_null()) return false; |
3938 | 160 if (AllowParallelDefineClass && java_lang_ClassLoader::parallelCapable(class_loader())) { |
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161 return true; |
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162 } |
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163 return false; |
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164 } |
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165 |
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166 /** |
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167 * Returns true if the passed class loader is the extension class loader. |
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168 */ |
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169 bool SystemDictionary::is_ext_class_loader(Handle class_loader) { |
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170 if (class_loader.is_null()) { |
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171 return false; |
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172 } |
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173 return (class_loader->klass()->name() == vmSymbols::sun_misc_Launcher_ExtClassLoader()); |
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174 } |
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175 |
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176 // ---------------------------------------------------------------------------- |
0 | 177 // Resolving of classes |
178 | |
179 // Forwards to resolve_or_null | |
180 | |
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181 Klass* SystemDictionary::resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS) { |
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182 Klass* klass = resolve_or_null(class_name, class_loader, protection_domain, THREAD); |
0 | 183 if (HAS_PENDING_EXCEPTION || klass == NULL) { |
184 KlassHandle k_h(THREAD, klass); | |
185 // can return a null klass | |
186 klass = handle_resolution_exception(class_name, class_loader, protection_domain, throw_error, k_h, THREAD); | |
187 } | |
188 return klass; | |
189 } | |
190 | |
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191 Klass* SystemDictionary::handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS) { |
0 | 192 if (HAS_PENDING_EXCEPTION) { |
193 // If we have a pending exception we forward it to the caller, unless throw_error is true, | |
194 // in which case we have to check whether the pending exception is a ClassNotFoundException, | |
195 // and if so convert it to a NoClassDefFoundError | |
196 // And chain the original ClassNotFoundException | |
1142 | 197 if (throw_error && PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass())) { |
0 | 198 ResourceMark rm(THREAD); |
199 assert(klass_h() == NULL, "Should not have result with exception pending"); | |
200 Handle e(THREAD, PENDING_EXCEPTION); | |
201 CLEAR_PENDING_EXCEPTION; | |
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202 THROW_MSG_CAUSE_NULL(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string(), e); |
0 | 203 } else { |
204 return NULL; | |
205 } | |
206 } | |
207 // Class not found, throw appropriate error or exception depending on value of throw_error | |
208 if (klass_h() == NULL) { | |
209 ResourceMark rm(THREAD); | |
210 if (throw_error) { | |
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211 THROW_MSG_NULL(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string()); |
0 | 212 } else { |
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213 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), class_name->as_C_string()); |
0 | 214 } |
215 } | |
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216 return (Klass*)klass_h(); |
0 | 217 } |
218 | |
219 | |
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220 Klass* SystemDictionary::resolve_or_fail(Symbol* class_name, |
0 | 221 bool throw_error, TRAPS) |
222 { | |
223 return resolve_or_fail(class_name, Handle(), Handle(), throw_error, THREAD); | |
224 } | |
225 | |
226 | |
227 // Forwards to resolve_instance_class_or_null | |
228 | |
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229 Klass* SystemDictionary::resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS) { |
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230 assert(THREAD->can_call_java(), |
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231 err_msg("can not load classes with compiler thread: class=%s, classloader=%s", |
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232 class_name->as_C_string(), |
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233 class_loader.is_null() ? "null" : class_loader->klass()->name()->as_C_string())); |
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234 if (FieldType::is_array(class_name)) { |
0 | 235 return resolve_array_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); |
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236 } else if (FieldType::is_obj(class_name)) { |
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237 ResourceMark rm(THREAD); |
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238 // Ignore wrapping L and ;. |
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239 TempNewSymbol name = SymbolTable::new_symbol(class_name->as_C_string() + 1, |
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240 class_name->utf8_length() - 2, CHECK_NULL); |
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241 return resolve_instance_class_or_null(name, class_loader, protection_domain, CHECK_NULL); |
0 | 242 } else { |
243 return resolve_instance_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); | |
244 } | |
245 } | |
246 | |
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247 Klass* SystemDictionary::resolve_or_null(Symbol* class_name, TRAPS) { |
0 | 248 return resolve_or_null(class_name, Handle(), Handle(), THREAD); |
249 } | |
250 | |
251 // Forwards to resolve_instance_class_or_null | |
252 | |
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253 Klass* SystemDictionary::resolve_array_class_or_null(Symbol* class_name, |
0 | 254 Handle class_loader, |
255 Handle protection_domain, | |
256 TRAPS) { | |
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257 assert(FieldType::is_array(class_name), "must be array"); |
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258 Klass* k = NULL; |
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259 FieldArrayInfo fd; |
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260 // dimension and object_key in FieldArrayInfo are assigned as a side-effect |
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261 // of this call |
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262 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_NULL); |
0 | 263 if (t == T_OBJECT) { |
264 // naked oop "k" is OK here -- we assign back into it | |
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265 k = SystemDictionary::resolve_instance_class_or_null(fd.object_key(), |
0 | 266 class_loader, |
267 protection_domain, | |
268 CHECK_NULL); | |
269 if (k != NULL) { | |
6983 | 270 k = k->array_klass(fd.dimension(), CHECK_NULL); |
0 | 271 } |
272 } else { | |
273 k = Universe::typeArrayKlassObj(t); | |
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274 k = TypeArrayKlass::cast(k)->array_klass(fd.dimension(), CHECK_NULL); |
0 | 275 } |
276 return k; | |
277 } | |
278 | |
279 | |
280 // Must be called for any super-class or super-interface resolution | |
281 // during class definition to allow class circularity checking | |
282 // super-interface callers: | |
283 // parse_interfaces - for defineClass & jvmtiRedefineClasses | |
284 // super-class callers: | |
285 // ClassFileParser - for defineClass & jvmtiRedefineClasses | |
286 // load_shared_class - while loading a class from shared archive | |
514 | 287 // resolve_instance_class_or_null: |
288 // via: handle_parallel_super_load | |
0 | 289 // when resolving a class that has an existing placeholder with |
290 // a saved superclass [i.e. a defineClass is currently in progress] | |
291 // if another thread is trying to resolve the class, it must do | |
292 // super-class checks on its own thread to catch class circularity | |
293 // This last call is critical in class circularity checking for cases | |
294 // where classloading is delegated to different threads and the | |
295 // classloader lock is released. | |
296 // Take the case: Base->Super->Base | |
297 // 1. If thread T1 tries to do a defineClass of class Base | |
298 // resolve_super_or_fail creates placeholder: T1, Base (super Super) | |
299 // 2. resolve_instance_class_or_null does not find SD or placeholder for Super | |
300 // so it tries to load Super | |
301 // 3. If we load the class internally, or user classloader uses same thread | |
302 // loadClassFromxxx or defineClass via parseClassFile Super ... | |
303 // 3.1 resolve_super_or_fail creates placeholder: T1, Super (super Base) | |
304 // 3.3 resolve_instance_class_or_null Base, finds placeholder for Base | |
305 // 3.4 calls resolve_super_or_fail Base | |
306 // 3.5 finds T1,Base -> throws class circularity | |
307 //OR 4. If T2 tries to resolve Super via defineClass Super ... | |
308 // 4.1 resolve_super_or_fail creates placeholder: T2, Super (super Base) | |
309 // 4.2 resolve_instance_class_or_null Base, finds placeholder for Base (super Super) | |
310 // 4.3 calls resolve_super_or_fail Super in parallel on own thread T2 | |
311 // 4.4 finds T2, Super -> throws class circularity | |
312 // Must be called, even if superclass is null, since this is | |
313 // where the placeholder entry is created which claims this | |
314 // thread is loading this class/classloader. | |
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315 Klass* SystemDictionary::resolve_super_or_fail(Symbol* child_name, |
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316 Symbol* class_name, |
0 | 317 Handle class_loader, |
318 Handle protection_domain, | |
319 bool is_superclass, | |
320 TRAPS) { | |
321 // Double-check, if child class is already loaded, just return super-class,interface | |
322 // Don't add a placedholder if already loaded, i.e. already in system dictionary | |
323 // Make sure there's a placeholder for the *child* before resolving. | |
324 // Used as a claim that this thread is currently loading superclass/classloader | |
325 // Used here for ClassCircularity checks and also for heap verification | |
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326 // (every InstanceKlass in the heap needs to be in the system dictionary |
0 | 327 // or have a placeholder). |
328 // Must check ClassCircularity before checking if super class is already loaded | |
329 // | |
330 // We might not already have a placeholder if this child_name was | |
331 // first seen via resolve_from_stream (jni_DefineClass or JVM_DefineClass); | |
332 // the name of the class might not be known until the stream is actually | |
333 // parsed. | |
334 // Bugs 4643874, 4715493 | |
335 // compute_hash can have a safepoint | |
336 | |
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337 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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338 unsigned int d_hash = dictionary()->compute_hash(child_name, loader_data); |
0 | 339 int d_index = dictionary()->hash_to_index(d_hash); |
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340 unsigned int p_hash = placeholders()->compute_hash(child_name, loader_data); |
0 | 341 int p_index = placeholders()->hash_to_index(p_hash); |
342 // can't throw error holding a lock | |
343 bool child_already_loaded = false; | |
344 bool throw_circularity_error = false; | |
345 { | |
346 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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347 Klass* childk = find_class(d_index, d_hash, child_name, loader_data); |
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348 Klass* quicksuperk; |
0 | 349 // to support // loading: if child done loading, just return superclass |
350 // if class_name, & class_loader don't match: | |
351 // if initial define, SD update will give LinkageError | |
352 // if redefine: compare_class_versions will give HIERARCHY_CHANGED | |
353 // so we don't throw an exception here. | |
354 // see: nsk redefclass014 & java.lang.instrument Instrument032 | |
355 if ((childk != NULL ) && (is_superclass) && | |
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356 ((quicksuperk = InstanceKlass::cast(childk)->super()) != NULL) && |
0 | 357 |
6983 | 358 ((quicksuperk->name() == class_name) && |
359 (quicksuperk->class_loader() == class_loader()))) { | |
0 | 360 return quicksuperk; |
361 } else { | |
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362 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, loader_data); |
0 | 363 if (probe && probe->check_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER)) { |
364 throw_circularity_error = true; | |
365 } | |
514 | 366 } |
367 if (!throw_circularity_error) { | |
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368 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, child_name, loader_data, PlaceholderTable::LOAD_SUPER, class_name, THREAD); |
0 | 369 } |
370 } | |
371 if (throw_circularity_error) { | |
372 ResourceMark rm(THREAD); | |
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373 THROW_MSG_NULL(vmSymbols::java_lang_ClassCircularityError(), child_name->as_C_string()); |
0 | 374 } |
375 | |
376 // java.lang.Object should have been found above | |
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377 assert(class_name != NULL, "null super class for resolving"); |
0 | 378 // Resolve the super class or interface, check results on return |
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379 Klass* superk = SystemDictionary::resolve_or_null(class_name, |
0 | 380 class_loader, |
381 protection_domain, | |
382 THREAD); | |
383 | |
384 KlassHandle superk_h(THREAD, superk); | |
385 | |
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386 // Clean up of placeholders moved so that each classloadAction registrar self-cleans up |
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387 // It is no longer necessary to keep the placeholder table alive until update_dictionary |
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388 // or error. GC used to walk the placeholder table as strong roots. |
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389 // The instanceKlass is kept alive because the class loader is on the stack, |
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390 // which keeps the loader_data alive, as well as all instanceKlasses in |
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391 // the loader_data. parseClassFile adds the instanceKlass to loader_data. |
0 | 392 { |
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393 MutexLocker mu(SystemDictionary_lock, THREAD); |
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394 placeholders()->find_and_remove(p_index, p_hash, child_name, loader_data, PlaceholderTable::LOAD_SUPER, THREAD); |
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395 SystemDictionary_lock->notify_all(); |
0 | 396 } |
397 if (HAS_PENDING_EXCEPTION || superk_h() == NULL) { | |
398 // can null superk | |
399 superk_h = KlassHandle(THREAD, handle_resolution_exception(class_name, class_loader, protection_domain, true, superk_h, THREAD)); | |
400 } | |
401 | |
402 return superk_h(); | |
403 } | |
404 | |
405 void SystemDictionary::validate_protection_domain(instanceKlassHandle klass, | |
406 Handle class_loader, | |
407 Handle protection_domain, | |
408 TRAPS) { | |
409 if(!has_checkPackageAccess()) return; | |
410 | |
411 // Now we have to call back to java to check if the initating class has access | |
412 JavaValue result(T_VOID); | |
413 if (TraceProtectionDomainVerification) { | |
414 // Print out trace information | |
415 tty->print_cr("Checking package access"); | |
416 tty->print(" - class loader: "); class_loader()->print_value_on(tty); tty->cr(); | |
417 tty->print(" - protection domain: "); protection_domain()->print_value_on(tty); tty->cr(); | |
418 tty->print(" - loading: "); klass()->print_value_on(tty); tty->cr(); | |
419 } | |
420 | |
1142 | 421 KlassHandle system_loader(THREAD, SystemDictionary::ClassLoader_klass()); |
0 | 422 JavaCalls::call_special(&result, |
423 class_loader, | |
424 system_loader, | |
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425 vmSymbols::checkPackageAccess_name(), |
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426 vmSymbols::class_protectiondomain_signature(), |
0 | 427 Handle(THREAD, klass->java_mirror()), |
428 protection_domain, | |
429 THREAD); | |
430 | |
431 if (TraceProtectionDomainVerification) { | |
432 if (HAS_PENDING_EXCEPTION) { | |
433 tty->print_cr(" -> DENIED !!!!!!!!!!!!!!!!!!!!!"); | |
434 } else { | |
435 tty->print_cr(" -> granted"); | |
436 } | |
437 tty->cr(); | |
438 } | |
439 | |
440 if (HAS_PENDING_EXCEPTION) return; | |
441 | |
442 // If no exception has been thrown, we have validated the protection domain | |
443 // Insert the protection domain of the initiating class into the set. | |
444 { | |
445 // We recalculate the entry here -- we've called out to java since | |
446 // the last time it was calculated. | |
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447 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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448 |
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449 Symbol* kn = klass->name(); |
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450 unsigned int d_hash = dictionary()->compute_hash(kn, loader_data); |
0 | 451 int d_index = dictionary()->hash_to_index(d_hash); |
452 | |
453 MutexLocker mu(SystemDictionary_lock, THREAD); | |
454 { | |
455 // Note that we have an entry, and entries can be deleted only during GC, | |
456 // so we cannot allow GC to occur while we're holding this entry. | |
457 | |
458 // We're using a No_Safepoint_Verifier to catch any place where we | |
459 // might potentially do a GC at all. | |
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460 // Dictionary::do_unloading() asserts that classes in SD are only |
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461 // unloaded at a safepoint. Anonymous classes are not in SD. |
0 | 462 No_Safepoint_Verifier nosafepoint; |
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463 dictionary()->add_protection_domain(d_index, d_hash, klass, loader_data, |
0 | 464 protection_domain, THREAD); |
465 } | |
466 } | |
467 } | |
468 | |
469 // We only get here if this thread finds that another thread | |
470 // has already claimed the placeholder token for the current operation, | |
471 // but that other thread either never owned or gave up the | |
472 // object lock | |
473 // Waits on SystemDictionary_lock to indicate placeholder table updated | |
474 // On return, caller must recheck placeholder table state | |
475 // | |
476 // We only get here if | |
477 // 1) custom classLoader, i.e. not bootstrap classloader | |
478 // 2) UnsyncloadClass not set | |
479 // 3) custom classLoader has broken the class loader objectLock | |
480 // so another thread got here in parallel | |
481 // | |
482 // lockObject must be held. | |
483 // Complicated dance due to lock ordering: | |
484 // Must first release the classloader object lock to | |
485 // allow initial definer to complete the class definition | |
486 // and to avoid deadlock | |
487 // Reclaim classloader lock object with same original recursion count | |
488 // Must release SystemDictionary_lock after notify, since | |
489 // class loader lock must be claimed before SystemDictionary_lock | |
490 // to prevent deadlocks | |
491 // | |
492 // The notify allows applications that did an untimed wait() on | |
493 // the classloader object lock to not hang. | |
494 void SystemDictionary::double_lock_wait(Handle lockObject, TRAPS) { | |
495 assert_lock_strong(SystemDictionary_lock); | |
496 | |
497 bool calledholdinglock | |
498 = ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, lockObject); | |
499 assert(calledholdinglock,"must hold lock for notify"); | |
514 | 500 assert((!(lockObject() == _system_loader_lock_obj) && !is_parallelCapable(lockObject)), "unexpected double_lock_wait"); |
0 | 501 ObjectSynchronizer::notifyall(lockObject, THREAD); |
502 intptr_t recursions = ObjectSynchronizer::complete_exit(lockObject, THREAD); | |
503 SystemDictionary_lock->wait(); | |
504 SystemDictionary_lock->unlock(); | |
505 ObjectSynchronizer::reenter(lockObject, recursions, THREAD); | |
506 SystemDictionary_lock->lock(); | |
507 } | |
508 | |
509 // If the class in is in the placeholder table, class loading is in progress | |
510 // For cases where the application changes threads to load classes, it | |
511 // is critical to ClassCircularity detection that we try loading | |
512 // the superclass on the same thread internally, so we do parallel | |
513 // super class loading here. | |
514 // This also is critical in cases where the original thread gets stalled | |
515 // even in non-circularity situations. | |
516 // Note: must call resolve_super_or_fail even if null super - | |
514 | 517 // to force placeholder entry creation for this class for circularity detection |
0 | 518 // Caller must check for pending exception |
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519 // Returns non-null Klass* if other thread has completed load |
0 | 520 // and we are done, |
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521 // If return null Klass* and no pending exception, the caller must load the class |
0 | 522 instanceKlassHandle SystemDictionary::handle_parallel_super_load( |
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523 Symbol* name, Symbol* superclassname, Handle class_loader, |
0 | 524 Handle protection_domain, Handle lockObject, TRAPS) { |
525 | |
526 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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527 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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528 unsigned int d_hash = dictionary()->compute_hash(name, loader_data); |
0 | 529 int d_index = dictionary()->hash_to_index(d_hash); |
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530 unsigned int p_hash = placeholders()->compute_hash(name, loader_data); |
0 | 531 int p_index = placeholders()->hash_to_index(p_hash); |
532 | |
533 // superk is not used, resolve_super called for circularity check only | |
534 // This code is reached in two situations. One if this thread | |
535 // is loading the same class twice (e.g. ClassCircularity, or | |
536 // java.lang.instrument). | |
537 // The second is if another thread started the resolve_super first | |
538 // and has not yet finished. | |
539 // In both cases the original caller will clean up the placeholder | |
540 // entry on error. | |
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541 Klass* superk = SystemDictionary::resolve_super_or_fail(name, |
0 | 542 superclassname, |
543 class_loader, | |
544 protection_domain, | |
545 true, | |
546 CHECK_(nh)); | |
547 | |
514 | 548 // parallelCapable class loaders do NOT wait for parallel superclass loads to complete |
549 // Serial class loaders and bootstrap classloader do wait for superclass loads | |
550 if (!class_loader.is_null() && is_parallelCapable(class_loader)) { | |
0 | 551 MutexLocker mu(SystemDictionary_lock, THREAD); |
552 // Check if classloading completed while we were loading superclass or waiting | |
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553 Klass* check = find_class(d_index, d_hash, name, loader_data); |
0 | 554 if (check != NULL) { |
555 // Klass is already loaded, so just return it | |
556 return(instanceKlassHandle(THREAD, check)); | |
557 } else { | |
558 return nh; | |
559 } | |
560 } | |
561 | |
562 // must loop to both handle other placeholder updates | |
563 // and spurious notifications | |
564 bool super_load_in_progress = true; | |
565 PlaceholderEntry* placeholder; | |
566 while (super_load_in_progress) { | |
567 MutexLocker mu(SystemDictionary_lock, THREAD); | |
568 // Check if classloading completed while we were loading superclass or waiting | |
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569 Klass* check = find_class(d_index, d_hash, name, loader_data); |
0 | 570 if (check != NULL) { |
571 // Klass is already loaded, so just return it | |
572 return(instanceKlassHandle(THREAD, check)); | |
573 } else { | |
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574 placeholder = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
0 | 575 if (placeholder && placeholder->super_load_in_progress() ){ |
576 // Before UnsyncloadClass: | |
577 // We only get here if the application has released the | |
578 // classloader lock when another thread was in the middle of loading a | |
579 // superclass/superinterface for this class, and now | |
580 // this thread is also trying to load this class. | |
581 // To minimize surprises, the first thread that started to | |
582 // load a class should be the one to complete the loading | |
583 // with the classfile it initially expected. | |
584 // This logic has the current thread wait once it has done | |
585 // all the superclass/superinterface loading it can, until | |
586 // the original thread completes the class loading or fails | |
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587 // If it completes we will use the resulting InstanceKlass |
0 | 588 // which we will find below in the systemDictionary. |
589 // We also get here for parallel bootstrap classloader | |
590 if (class_loader.is_null()) { | |
591 SystemDictionary_lock->wait(); | |
592 } else { | |
593 double_lock_wait(lockObject, THREAD); | |
594 } | |
595 } else { | |
596 // If not in SD and not in PH, other thread's load must have failed | |
597 super_load_in_progress = false; | |
598 } | |
599 } | |
600 } | |
601 return (nh); | |
602 } | |
603 | |
604 | |
10405 | 605 Klass* SystemDictionary::resolve_instance_class_or_null(Symbol* name, |
606 Handle class_loader, | |
607 Handle protection_domain, | |
608 TRAPS) { | |
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609 assert(name != NULL && !FieldType::is_array(name) && |
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610 !FieldType::is_obj(name), "invalid class name"); |
0 | 611 |
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612 Ticks class_load_start_time = Ticks::now(); |
10405 | 613 |
0 | 614 // UseNewReflection |
615 // Fix for 4474172; see evaluation for more details | |
616 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); | |
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617 ClassLoaderData *loader_data = register_loader(class_loader, CHECK_NULL); |
0 | 618 |
619 // Do lookup to see if class already exist and the protection domain | |
620 // has the right access | |
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621 // This call uses find which checks protection domain already matches |
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622 // All subsequent calls use find_class, and set has_loaded_class so that |
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623 // before we return a result we call out to java to check for valid protection domain |
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624 // to allow returning the Klass* and add it to the pd_set if it is valid |
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625 unsigned int d_hash = dictionary()->compute_hash(name, loader_data); |
0 | 626 int d_index = dictionary()->hash_to_index(d_hash); |
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627 Klass* probe = dictionary()->find(d_index, d_hash, name, loader_data, |
0 | 628 protection_domain, THREAD); |
629 if (probe != NULL) return probe; | |
630 | |
631 | |
632 // Non-bootstrap class loaders will call out to class loader and | |
633 // define via jvm/jni_DefineClass which will acquire the | |
634 // class loader object lock to protect against multiple threads | |
635 // defining the class in parallel by accident. | |
636 // This lock must be acquired here so the waiter will find | |
637 // any successful result in the SystemDictionary and not attempt | |
638 // the define | |
514 | 639 // ParallelCapable Classloaders and the bootstrap classloader, |
0 | 640 // or all classloaders with UnsyncloadClass do not acquire lock here |
641 bool DoObjectLock = true; | |
514 | 642 if (is_parallelCapable(class_loader)) { |
0 | 643 DoObjectLock = false; |
644 } | |
645 | |
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646 unsigned int p_hash = placeholders()->compute_hash(name, loader_data); |
0 | 647 int p_index = placeholders()->hash_to_index(p_hash); |
648 | |
649 // Class is not in SystemDictionary so we have to do loading. | |
650 // Make sure we are synchronized on the class loader before we proceed | |
651 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
652 check_loader_lock_contention(lockObject, THREAD); | |
653 ObjectLocker ol(lockObject, THREAD, DoObjectLock); | |
654 | |
655 // Check again (after locking) if class already exist in SystemDictionary | |
656 bool class_has_been_loaded = false; | |
657 bool super_load_in_progress = false; | |
658 bool havesupername = false; | |
659 instanceKlassHandle k; | |
660 PlaceholderEntry* placeholder; | |
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661 Symbol* superclassname = NULL; |
0 | 662 |
663 { | |
664 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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665 Klass* check = find_class(d_index, d_hash, name, loader_data); |
0 | 666 if (check != NULL) { |
667 // Klass is already loaded, so just return it | |
668 class_has_been_loaded = true; | |
669 k = instanceKlassHandle(THREAD, check); | |
670 } else { | |
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671 placeholder = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
0 | 672 if (placeholder && placeholder->super_load_in_progress()) { |
673 super_load_in_progress = true; | |
674 if (placeholder->havesupername() == true) { | |
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675 superclassname = placeholder->supername(); |
0 | 676 havesupername = true; |
677 } | |
678 } | |
679 } | |
680 } | |
681 | |
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682 // If the class is in the placeholder table, class loading is in progress |
0 | 683 if (super_load_in_progress && havesupername==true) { |
684 k = SystemDictionary::handle_parallel_super_load(name, superclassname, | |
685 class_loader, protection_domain, lockObject, THREAD); | |
686 if (HAS_PENDING_EXCEPTION) { | |
687 return NULL; | |
688 } | |
689 if (!k.is_null()) { | |
690 class_has_been_loaded = true; | |
691 } | |
692 } | |
693 | |
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694 bool throw_circularity_error = false; |
0 | 695 if (!class_has_been_loaded) { |
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696 bool load_instance_added = false; |
0 | 697 |
698 // add placeholder entry to record loading instance class | |
699 // Five cases: | |
700 // All cases need to prevent modifying bootclasssearchpath | |
701 // in parallel with a classload of same classname | |
514 | 702 // Redefineclasses uses existence of the placeholder for the duration |
703 // of the class load to prevent concurrent redefinition of not completely | |
704 // defined classes. | |
0 | 705 // case 1. traditional classloaders that rely on the classloader object lock |
706 // - no other need for LOAD_INSTANCE | |
707 // case 2. traditional classloaders that break the classloader object lock | |
708 // as a deadlock workaround. Detection of this case requires that | |
709 // this check is done while holding the classloader object lock, | |
710 // and that lock is still held when calling classloader's loadClass. | |
711 // For these classloaders, we ensure that the first requestor | |
712 // completes the load and other requestors wait for completion. | |
713 // case 3. UnsyncloadClass - don't use objectLocker | |
714 // With this flag, we allow parallel classloading of a | |
715 // class/classloader pair | |
716 // case4. Bootstrap classloader - don't own objectLocker | |
717 // This classloader supports parallelism at the classloader level, | |
718 // but only allows a single load of a class/classloader pair. | |
719 // No performance benefit and no deadlock issues. | |
514 | 720 // case 5. parallelCapable user level classloaders - without objectLocker |
721 // Allow parallel classloading of a class/classloader pair | |
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722 |
0 | 723 { |
724 MutexLocker mu(SystemDictionary_lock, THREAD); | |
514 | 725 if (class_loader.is_null() || !is_parallelCapable(class_loader)) { |
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726 PlaceholderEntry* oldprobe = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
0 | 727 if (oldprobe) { |
728 // only need check_seen_thread once, not on each loop | |
729 // 6341374 java/lang/Instrument with -Xcomp | |
730 if (oldprobe->check_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE)) { | |
731 throw_circularity_error = true; | |
732 } else { | |
733 // case 1: traditional: should never see load_in_progress. | |
734 while (!class_has_been_loaded && oldprobe && oldprobe->instance_load_in_progress()) { | |
735 | |
736 // case 4: bootstrap classloader: prevent futile classloading, | |
737 // wait on first requestor | |
738 if (class_loader.is_null()) { | |
739 SystemDictionary_lock->wait(); | |
740 } else { | |
741 // case 2: traditional with broken classloader lock. wait on first | |
742 // requestor. | |
743 double_lock_wait(lockObject, THREAD); | |
744 } | |
745 // Check if classloading completed while we were waiting | |
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746 Klass* check = find_class(d_index, d_hash, name, loader_data); |
0 | 747 if (check != NULL) { |
748 // Klass is already loaded, so just return it | |
749 k = instanceKlassHandle(THREAD, check); | |
750 class_has_been_loaded = true; | |
751 } | |
752 // check if other thread failed to load and cleaned up | |
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753 oldprobe = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
0 | 754 } |
755 } | |
756 } | |
757 } | |
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758 // All cases: add LOAD_INSTANCE holding SystemDictionary_lock |
514 | 759 // case 3: UnsyncloadClass || case 5: parallelCapable: allow competing threads to try |
0 | 760 // LOAD_INSTANCE in parallel |
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761 |
514 | 762 if (!throw_circularity_error && !class_has_been_loaded) { |
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763 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, name, loader_data, PlaceholderTable::LOAD_INSTANCE, NULL, THREAD); |
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764 load_instance_added = true; |
0 | 765 // For class loaders that do not acquire the classloader object lock, |
766 // if they did not catch another thread holding LOAD_INSTANCE, | |
767 // need a check analogous to the acquire ObjectLocker/find_class | |
768 // i.e. now that we hold the LOAD_INSTANCE token on loading this class/CL | |
769 // one final check if the load has already completed | |
514 | 770 // class loaders holding the ObjectLock shouldn't find the class here |
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771 Klass* check = find_class(d_index, d_hash, name, loader_data); |
0 | 772 if (check != NULL) { |
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773 // Klass is already loaded, so return it after checking/adding protection domain |
0 | 774 k = instanceKlassHandle(THREAD, check); |
775 class_has_been_loaded = true; | |
776 } | |
777 } | |
778 } | |
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779 |
0 | 780 // must throw error outside of owning lock |
781 if (throw_circularity_error) { | |
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782 assert(!HAS_PENDING_EXCEPTION && load_instance_added == false,"circularity error cleanup"); |
0 | 783 ResourceMark rm(THREAD); |
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784 THROW_MSG_NULL(vmSymbols::java_lang_ClassCircularityError(), name->as_C_string()); |
0 | 785 } |
786 | |
787 if (!class_has_been_loaded) { | |
788 | |
789 // Do actual loading | |
790 k = load_instance_class(name, class_loader, THREAD); | |
791 | |
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792 // For UnsyncloadClass only |
0 | 793 // If they got a linkageError, check if a parallel class load succeeded. |
794 // If it did, then for bytecode resolution the specification requires | |
795 // that we return the same result we did for the other thread, i.e. the | |
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796 // successfully loaded InstanceKlass |
0 | 797 // Should not get here for classloaders that support parallelism |
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798 // with the new cleaner mechanism, even with AllowParallelDefineClass |
514 | 799 // Bootstrap goes through here to allow for an extra guarantee check |
0 | 800 if (UnsyncloadClass || (class_loader.is_null())) { |
801 if (k.is_null() && HAS_PENDING_EXCEPTION | |
1142 | 802 && PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { |
0 | 803 MutexLocker mu(SystemDictionary_lock, THREAD); |
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804 Klass* check = find_class(d_index, d_hash, name, loader_data); |
0 | 805 if (check != NULL) { |
806 // Klass is already loaded, so just use it | |
807 k = instanceKlassHandle(THREAD, check); | |
808 CLEAR_PENDING_EXCEPTION; | |
809 guarantee((!class_loader.is_null()), "dup definition for bootstrap loader?"); | |
810 } | |
811 } | |
812 } | |
813 | |
814 // If everything was OK (no exceptions, no null return value), and | |
815 // class_loader is NOT the defining loader, do a little more bookkeeping. | |
816 if (!HAS_PENDING_EXCEPTION && !k.is_null() && | |
817 k->class_loader() != class_loader()) { | |
818 | |
819 check_constraints(d_index, d_hash, k, class_loader, false, THREAD); | |
820 | |
821 // Need to check for a PENDING_EXCEPTION again; check_constraints | |
822 // can throw and doesn't use the CHECK macro. | |
823 if (!HAS_PENDING_EXCEPTION) { | |
824 { // Grabbing the Compile_lock prevents systemDictionary updates | |
825 // during compilations. | |
826 MutexLocker mu(Compile_lock, THREAD); | |
827 update_dictionary(d_index, d_hash, p_index, p_hash, | |
10405 | 828 k, class_loader, THREAD); |
0 | 829 } |
10405 | 830 |
0 | 831 if (JvmtiExport::should_post_class_load()) { |
832 Thread *thread = THREAD; | |
833 assert(thread->is_Java_thread(), "thread->is_Java_thread()"); | |
834 JvmtiExport::post_class_load((JavaThread *) thread, k()); | |
835 } | |
836 } | |
837 } | |
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838 } // load_instance_class loop |
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839 |
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840 if (HAS_PENDING_EXCEPTION) { |
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841 // An exception, such as OOM could have happened at various places inside |
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842 // load_instance_class. We might have partially initialized a shared class |
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843 // and need to clean it up. |
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844 if (class_loader.is_null()) { |
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845 // In some cases k may be null. Let's find the shared class again. |
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846 instanceKlassHandle ik(THREAD, find_shared_class(name)); |
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847 if (ik.not_null()) { |
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848 if (ik->class_loader_data() == NULL) { |
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849 // We didn't go as far as Klass::restore_unshareable_info(), |
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850 // so nothing to clean up. |
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851 } else { |
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852 Klass *kk; |
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853 { |
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854 MutexLocker mu(SystemDictionary_lock, THREAD); |
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855 kk = find_class(d_index, d_hash, name, ik->class_loader_data()); |
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856 } |
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857 if (kk != NULL) { |
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858 // No clean up is needed if the shared class has been entered |
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859 // into system dictionary, as load_shared_class() won't be called |
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860 // again. |
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861 } else { |
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862 // This must be done outside of the SystemDictionary_lock to |
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863 // avoid deadlock. |
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864 // |
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865 // Note that Klass::restore_unshareable_info (called via |
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866 // load_instance_class above) is also called outside |
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867 // of SystemDictionary_lock. Other threads are blocked from |
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868 // loading this class because they are waiting on the |
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869 // SystemDictionary_lock until this thread removes |
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870 // the placeholder below. |
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871 // |
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872 // This need to be re-thought when parallel-capable non-boot |
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873 // classloaders are supported by CDS (today they're not). |
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874 clean_up_shared_class(ik, class_loader, THREAD); |
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875 } |
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876 } |
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877 } |
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878 } |
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879 } |
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880 |
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881 if (load_instance_added == true) { |
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882 // clean up placeholder entries for LOAD_INSTANCE success or error |
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883 // This brackets the SystemDictionary updates for both defining |
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884 // and initiating loaders |
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885 MutexLocker mu(SystemDictionary_lock, THREAD); |
10405 | 886 placeholders()->find_and_remove(p_index, p_hash, name, loader_data, PlaceholderTable::LOAD_INSTANCE, THREAD); |
887 SystemDictionary_lock->notify_all(); | |
0 | 888 } |
889 } | |
890 | |
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891 if (HAS_PENDING_EXCEPTION || k.is_null()) { |
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892 return NULL; |
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893 } |
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894 |
10405 | 895 post_class_load_event(class_load_start_time, k, class_loader); |
896 | |
0 | 897 #ifdef ASSERT |
898 { | |
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899 ClassLoaderData* loader_data = k->class_loader_data(); |
0 | 900 MutexLocker mu(SystemDictionary_lock, THREAD); |
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901 Klass* kk = find_class(name, loader_data); |
0 | 902 assert(kk == k(), "should be present in dictionary"); |
903 } | |
904 #endif | |
905 | |
906 // return if the protection domain in NULL | |
907 if (protection_domain() == NULL) return k(); | |
908 | |
909 // Check the protection domain has the right access | |
910 { | |
911 MutexLocker mu(SystemDictionary_lock, THREAD); | |
912 // Note that we have an entry, and entries can be deleted only during GC, | |
913 // so we cannot allow GC to occur while we're holding this entry. | |
914 // We're using a No_Safepoint_Verifier to catch any place where we | |
915 // might potentially do a GC at all. | |
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916 // Dictionary::do_unloading() asserts that classes in SD are only |
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917 // unloaded at a safepoint. Anonymous classes are not in SD. |
0 | 918 No_Safepoint_Verifier nosafepoint; |
919 if (dictionary()->is_valid_protection_domain(d_index, d_hash, name, | |
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920 loader_data, |
0 | 921 protection_domain)) { |
922 return k(); | |
923 } | |
924 } | |
925 | |
926 // Verify protection domain. If it fails an exception is thrown | |
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927 validate_protection_domain(k, class_loader, protection_domain, CHECK_NULL); |
0 | 928 |
929 return k(); | |
930 } | |
931 | |
932 | |
933 // This routine does not lock the system dictionary. | |
934 // | |
935 // Since readers don't hold a lock, we must make sure that system | |
936 // dictionary entries are only removed at a safepoint (when only one | |
937 // thread is running), and are added to in a safe way (all links must | |
938 // be updated in an MT-safe manner). | |
939 // | |
940 // Callers should be aware that an entry could be added just after | |
941 // _dictionary->bucket(index) is read here, so the caller will not see | |
942 // the new entry. | |
943 | |
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944 Klass* SystemDictionary::find(Symbol* class_name, |
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945 Handle class_loader, |
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946 Handle protection_domain, |
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947 TRAPS) { |
0 | 948 |
556
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949 // UseNewReflection |
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950 // The result of this call should be consistent with the result |
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951 // of the call to resolve_instance_class_or_null(). |
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952 // See evaluation 6790209 and 4474172 for more details. |
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953 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); |
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954 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data_or_null(class_loader()); |
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955 |
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956 if (loader_data == NULL) { |
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957 // If the ClassLoaderData has not been setup, |
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958 // then the class loader has no entries in the dictionary. |
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959 return NULL; |
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960 } |
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961 |
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962 unsigned int d_hash = dictionary()->compute_hash(class_name, loader_data); |
0 | 963 int d_index = dictionary()->hash_to_index(d_hash); |
964 | |
965 { | |
966 // Note that we have an entry, and entries can be deleted only during GC, | |
967 // so we cannot allow GC to occur while we're holding this entry. | |
968 // We're using a No_Safepoint_Verifier to catch any place where we | |
969 // might potentially do a GC at all. | |
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970 // Dictionary::do_unloading() asserts that classes in SD are only |
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971 // unloaded at a safepoint. Anonymous classes are not in SD. |
0 | 972 No_Safepoint_Verifier nosafepoint; |
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973 return dictionary()->find(d_index, d_hash, class_name, loader_data, |
0 | 974 protection_domain, THREAD); |
975 } | |
976 } | |
977 | |
978 | |
979 // Look for a loaded instance or array klass by name. Do not do any loading. | |
980 // return NULL in case of error. | |
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981 Klass* SystemDictionary::find_instance_or_array_klass(Symbol* class_name, |
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982 Handle class_loader, |
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983 Handle protection_domain, |
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984 TRAPS) { |
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985 Klass* k = NULL; |
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986 assert(class_name != NULL, "class name must be non NULL"); |
132
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987 |
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988 if (FieldType::is_array(class_name)) { |
0 | 989 // The name refers to an array. Parse the name. |
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990 // dimension and object_key in FieldArrayInfo are assigned as a |
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991 // side-effect of this call |
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992 FieldArrayInfo fd; |
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993 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
0 | 994 if (t != T_OBJECT) { |
995 k = Universe::typeArrayKlassObj(t); | |
996 } else { | |
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997 k = SystemDictionary::find(fd.object_key(), class_loader, protection_domain, THREAD); |
0 | 998 } |
999 if (k != NULL) { | |
6983 | 1000 k = k->array_klass_or_null(fd.dimension()); |
0 | 1001 } |
1002 } else { | |
1003 k = find(class_name, class_loader, protection_domain, THREAD); | |
1004 } | |
1005 return k; | |
1006 } | |
1007 | |
1008 // Note: this method is much like resolve_from_stream, but | |
1009 // updates no supplemental data structures. | |
1010 // TODO consolidate the two methods with a helper routine? | |
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1011 Klass* SystemDictionary::parse_stream(Symbol* class_name, |
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1012 Handle class_loader, |
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1013 Handle protection_domain, |
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1014 ClassFileStream* st, |
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1015 KlassHandle host_klass, |
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1016 GrowableArray<Handle>* cp_patches, |
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1017 TRAPS) { |
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1018 TempNewSymbol parsed_name = NULL; |
0 | 1019 |
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1020 Ticks class_load_start_time = Ticks::now(); |
10405 | 1021 |
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1022 ClassLoaderData* loader_data; |
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1023 if (host_klass.not_null()) { |
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1024 // Create a new CLD for anonymous class, that uses the same class loader |
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1025 // as the host_klass |
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1026 assert(EnableInvokeDynamic, ""); |
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1027 guarantee(host_klass->class_loader() == class_loader(), "should be the same"); |
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1028 loader_data = ClassLoaderData::anonymous_class_loader_data(class_loader(), CHECK_NULL); |
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1029 loader_data->record_dependency(host_klass(), CHECK_NULL); |
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1030 } else { |
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1031 loader_data = ClassLoaderData::class_loader_data(class_loader()); |
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1032 } |
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1033 |
0 | 1034 // Parse the stream. Note that we do this even though this klass might |
1035 // already be present in the SystemDictionary, otherwise we would not | |
1036 // throw potential ClassFormatErrors. | |
1037 // | |
1038 // Note: "name" is updated. | |
1039 | |
1040 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
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1041 loader_data, |
0 | 1042 protection_domain, |
710 | 1043 host_klass, |
1044 cp_patches, | |
0 | 1045 parsed_name, |
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1046 true, |
0 | 1047 THREAD); |
1048 | |
1049 | |
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1050 if (host_klass.not_null() && k.not_null()) { |
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1051 assert(EnableInvokeDynamic, ""); |
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1052 k->set_host_klass(host_klass()); |
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1053 // If it's anonymous, initialize it now, since nobody else will. |
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1054 |
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1055 { |
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1056 MutexLocker mu_r(Compile_lock, THREAD); |
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1057 |
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1058 // Add to class hierarchy, initialize vtables, and do possible |
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1059 // deoptimizations. |
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1060 add_to_hierarchy(k, CHECK_NULL); // No exception, but can block |
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1061 |
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1062 // But, do not add to system dictionary. That normally takes |
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1063 // care of updating _number_of_modifications so do it here. |
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1064 notice_modification(); |
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1065 } |
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1066 |
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1067 // Rewrite and patch constant pool here. |
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1068 k->link_class(CHECK_NULL); |
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1069 if (cp_patches != NULL) { |
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1070 k->constants()->patch_resolved_references(cp_patches); |
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1071 } |
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1072 k->eager_initialize(CHECK_NULL); |
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1073 |
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1074 // notify jvmti |
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1075 if (JvmtiExport::should_post_class_load()) { |
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1076 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); |
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1077 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); |
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1078 } |
10405 | 1079 |
1080 post_class_load_event(class_load_start_time, k, class_loader); | |
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1081 } |
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1082 assert(host_klass.not_null() || cp_patches == NULL, |
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1083 "cp_patches only found with host_klass"); |
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1084 |
0 | 1085 return k(); |
1086 } | |
1087 | |
1088 // Add a klass to the system from a stream (called by jni_DefineClass and | |
1089 // JVM_DefineClass). | |
1090 // Note: class_name can be NULL. In that case we do not know the name of | |
1091 // the class until we have parsed the stream. | |
1092 | |
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1093 Klass* SystemDictionary::resolve_from_stream(Symbol* class_name, |
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1094 Handle class_loader, |
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1095 Handle protection_domain, |
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1096 ClassFileStream* st, |
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1097 bool verify, |
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1098 TRAPS) { |
0 | 1099 |
514 | 1100 // Classloaders that support parallelism, e.g. bootstrap classloader, |
1101 // or all classloaders with UnsyncloadClass do not acquire lock here | |
1102 bool DoObjectLock = true; | |
1103 if (is_parallelCapable(class_loader)) { | |
1104 DoObjectLock = false; | |
1105 } | |
1106 | |
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1107 ClassLoaderData* loader_data = register_loader(class_loader, CHECK_NULL); |
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1108 |
514 | 1109 // Make sure we are synchronized on the class loader before we proceed |
0 | 1110 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); |
1111 check_loader_lock_contention(lockObject, THREAD); | |
514 | 1112 ObjectLocker ol(lockObject, THREAD, DoObjectLock); |
0 | 1113 |
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1114 TempNewSymbol parsed_name = NULL; |
0 | 1115 |
1116 // Parse the stream. Note that we do this even though this klass might | |
1117 // already be present in the SystemDictionary, otherwise we would not | |
1118 // throw potential ClassFormatErrors. | |
1119 // | |
1120 // Note: "name" is updated. | |
1121 | |
1122 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
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1123 loader_data, |
0 | 1124 protection_domain, |
1125 parsed_name, | |
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1126 verify, |
0 | 1127 THREAD); |
1128 | |
1129 const char* pkg = "java/"; | |
1130 if (!HAS_PENDING_EXCEPTION && | |
1131 !class_loader.is_null() && | |
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1132 parsed_name != NULL && |
0 | 1133 !strncmp((const char*)parsed_name->bytes(), pkg, strlen(pkg))) { |
1134 // It is illegal to define classes in the "java." package from | |
1135 // JVM_DefineClass or jni_DefineClass unless you're the bootclassloader | |
1136 ResourceMark rm(THREAD); | |
1137 char* name = parsed_name->as_C_string(); | |
1138 char* index = strrchr(name, '/'); | |
1139 *index = '\0'; // chop to just the package name | |
1140 while ((index = strchr(name, '/')) != NULL) { | |
1141 *index = '.'; // replace '/' with '.' in package name | |
1142 } | |
1143 const char* fmt = "Prohibited package name: %s"; | |
1144 size_t len = strlen(fmt) + strlen(name); | |
1145 char* message = NEW_RESOURCE_ARRAY(char, len); | |
1146 jio_snprintf(message, len, fmt, name); | |
1147 Exceptions::_throw_msg(THREAD_AND_LOCATION, | |
1148 vmSymbols::java_lang_SecurityException(), message); | |
1149 } | |
1150 | |
1151 if (!HAS_PENDING_EXCEPTION) { | |
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1152 assert(parsed_name != NULL, "Sanity"); |
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1153 assert(class_name == NULL || class_name == parsed_name, "name mismatch"); |
0 | 1154 // Verification prevents us from creating names with dots in them, this |
1155 // asserts that that's the case. | |
1156 assert(is_internal_format(parsed_name), | |
1157 "external class name format used internally"); | |
1158 | |
1159 // Add class just loaded | |
514 | 1160 // If a class loader supports parallel classloading handle parallel define requests |
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1161 // find_or_define_instance_class may return a different InstanceKlass |
514 | 1162 if (is_parallelCapable(class_loader)) { |
1163 k = find_or_define_instance_class(class_name, class_loader, k, THREAD); | |
1164 } else { | |
1165 define_instance_class(k, THREAD); | |
1166 } | |
0 | 1167 } |
1168 | |
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1169 // Make sure we have an entry in the SystemDictionary on success |
0 | 1170 debug_only( { |
1171 if (!HAS_PENDING_EXCEPTION) { | |
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1172 assert(parsed_name != NULL, "parsed_name is still null?"); |
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1173 Symbol* h_name = k->name(); |
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1174 ClassLoaderData *defining_loader_data = k->class_loader_data(); |
0 | 1175 |
1176 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1177 | |
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1178 Klass* check = find_class(parsed_name, loader_data); |
0 | 1179 assert(check == k(), "should be present in the dictionary"); |
1180 | |
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1181 Klass* check2 = find_class(h_name, defining_loader_data); |
0 | 1182 assert(check == check2, "name inconsistancy in SystemDictionary"); |
1183 } | |
1184 } ); | |
1185 | |
1186 return k(); | |
1187 } | |
1188 | |
1189 | |
6197 | 1190 void SystemDictionary::set_shared_dictionary(HashtableBucket<mtClass>* t, int length, |
0 | 1191 int number_of_entries) { |
6197 | 1192 assert(length == _nof_buckets * sizeof(HashtableBucket<mtClass>), |
0 | 1193 "bad shared dictionary size."); |
1194 _shared_dictionary = new Dictionary(_nof_buckets, t, number_of_entries); | |
1195 } | |
1196 | |
1197 | |
1198 // If there is a shared dictionary, then find the entry for the | |
1199 // given shared system class, if any. | |
1200 | |
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1201 Klass* SystemDictionary::find_shared_class(Symbol* class_name) { |
0 | 1202 if (shared_dictionary() != NULL) { |
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1203 unsigned int d_hash = shared_dictionary()->compute_hash(class_name, NULL); |
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1204 int d_index = shared_dictionary()->hash_to_index(d_hash); |
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1205 |
0 | 1206 return shared_dictionary()->find_shared_class(d_index, d_hash, class_name); |
1207 } else { | |
1208 return NULL; | |
1209 } | |
1210 } | |
1211 | |
1212 | |
1213 // Load a class from the shared spaces (found through the shared system | |
1214 // dictionary). Force the superclass and all interfaces to be loaded. | |
1215 // Update the class definition to include sibling classes and no | |
1216 // subclasses (yet). [Classes in the shared space are not part of the | |
1217 // object hierarchy until loaded.] | |
1218 | |
1219 instanceKlassHandle SystemDictionary::load_shared_class( | |
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1220 Symbol* class_name, Handle class_loader, TRAPS) { |
0 | 1221 instanceKlassHandle ik (THREAD, find_shared_class(class_name)); |
1222 return load_shared_class(ik, class_loader, THREAD); | |
1223 } | |
1224 | |
1225 instanceKlassHandle SystemDictionary::load_shared_class( | |
1226 instanceKlassHandle ik, Handle class_loader, TRAPS) { | |
1227 assert(class_loader.is_null(), "non-null classloader for shared class?"); | |
1228 if (ik.not_null()) { | |
1229 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1230 Symbol* class_name = ik->name(); |
0 | 1231 |
1232 // Found the class, now load the superclass and interfaces. If they | |
1233 // are shared, add them to the main system dictionary and reset | |
1234 // their hierarchy references (supers, subs, and interfaces). | |
1235 | |
1236 if (ik->super() != NULL) { | |
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1237 Symbol* cn = ik->super()->name(); |
0 | 1238 resolve_super_or_fail(class_name, cn, |
1239 class_loader, Handle(), true, CHECK_(nh)); | |
1240 } | |
1241 | |
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1242 Array<Klass*>* interfaces = ik->local_interfaces(); |
0 | 1243 int num_interfaces = interfaces->length(); |
1244 for (int index = 0; index < num_interfaces; index++) { | |
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1245 Klass* k = interfaces->at(index); |
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1246 |
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1247 // Note: can not use InstanceKlass::cast here because |
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1248 // interfaces' InstanceKlass's C++ vtbls haven't been |
0 | 1249 // reinitialized yet (they will be once the interface classes |
1250 // are loaded) | |
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1251 Symbol* name = k->name(); |
0 | 1252 resolve_super_or_fail(class_name, name, class_loader, Handle(), false, CHECK_(nh)); |
1253 } | |
1254 | |
1255 // Adjust methods to recover missing data. They need addresses for | |
1256 // interpreter entry points and their default native method address | |
1257 // must be reset. | |
1258 | |
1259 // Updating methods must be done under a lock so multiple | |
1260 // threads don't update these in parallel | |
1261 // Shared classes are all currently loaded by the bootstrap | |
1262 // classloader, so this will never cause a deadlock on | |
1263 // a custom class loader lock. | |
1264 | |
1265 { | |
1266 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
1267 check_loader_lock_contention(lockObject, THREAD); | |
1268 ObjectLocker ol(lockObject, THREAD, true); | |
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1269 ik->restore_unshareable_info(CHECK_(nh)); |
0 | 1270 } |
1271 | |
1272 if (TraceClassLoading) { | |
1273 ResourceMark rm; | |
1274 tty->print("[Loaded %s", ik->external_name()); | |
1275 tty->print(" from shared objects file"); | |
1276 tty->print_cr("]"); | |
1277 } | |
1278 // notify a class loaded from shared object | |
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1279 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(ik()), |
0 | 1280 true /* shared class */); |
1281 } | |
1282 return ik; | |
1283 } | |
1284 | |
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1285 void SystemDictionary::clean_up_shared_class(instanceKlassHandle ik, Handle class_loader, TRAPS) { |
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1286 // Updating methods must be done under a lock so multiple |
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1287 // threads don't update these in parallel |
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1288 // Shared classes are all currently loaded by the bootstrap |
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1289 // classloader, so this will never cause a deadlock on |
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1290 // a custom class loader lock. |
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1291 { |
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1292 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); |
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1293 check_loader_lock_contention(lockObject, THREAD); |
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1294 ObjectLocker ol(lockObject, THREAD, true); |
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1295 ik->remove_unshareable_info(); |
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1296 } |
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1297 } |
0 | 1298 |
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1299 instanceKlassHandle SystemDictionary::load_instance_class(Symbol* class_name, Handle class_loader, TRAPS) { |
0 | 1300 instanceKlassHandle nh = instanceKlassHandle(); // null Handle |
1301 if (class_loader.is_null()) { | |
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1302 |
0 | 1303 // Search the shared system dictionary for classes preloaded into the |
1304 // shared spaces. | |
1305 instanceKlassHandle k; | |
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1306 { |
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1307 PerfTraceTime vmtimer(ClassLoader::perf_shared_classload_time()); |
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1308 k = load_shared_class(class_name, class_loader, THREAD); |
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1309 } |
0 | 1310 |
1311 if (k.is_null()) { | |
1312 // Use VM class loader | |
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1313 PerfTraceTime vmtimer(ClassLoader::perf_sys_classload_time()); |
0 | 1314 k = ClassLoader::load_classfile(class_name, CHECK_(nh)); |
1315 } | |
1316 | |
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1317 // find_or_define_instance_class may return a different InstanceKlass |
0 | 1318 if (!k.is_null()) { |
1319 k = find_or_define_instance_class(class_name, class_loader, k, CHECK_(nh)); | |
1320 } | |
1321 return k; | |
1322 } else { | |
1323 // Use user specified class loader to load class. Call loadClass operation on class_loader. | |
1324 ResourceMark rm(THREAD); | |
1325 | |
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1326 assert(THREAD->is_Java_thread(), "must be a JavaThread"); |
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1327 JavaThread* jt = (JavaThread*) THREAD; |
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1328 |
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1329 PerfClassTraceTime vmtimer(ClassLoader::perf_app_classload_time(), |
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1330 ClassLoader::perf_app_classload_selftime(), |
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1331 ClassLoader::perf_app_classload_count(), |
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1332 jt->get_thread_stat()->perf_recursion_counts_addr(), |
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1333 jt->get_thread_stat()->perf_timers_addr(), |
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1334 PerfClassTraceTime::CLASS_LOAD); |
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1335 |
0 | 1336 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nh)); |
1337 // Translate to external class name format, i.e., convert '/' chars to '.' | |
1338 Handle string = java_lang_String::externalize_classname(s, CHECK_(nh)); | |
1339 | |
1340 JavaValue result(T_OBJECT); | |
1341 | |
1142 | 1342 KlassHandle spec_klass (THREAD, SystemDictionary::ClassLoader_klass()); |
0 | 1343 |
514 | 1344 // Call public unsynchronized loadClass(String) directly for all class loaders |
1345 // for parallelCapable class loaders. JDK >=7, loadClass(String, boolean) will | |
1346 // acquire a class-name based lock rather than the class loader object lock. | |
1347 // JDK < 7 already acquire the class loader lock in loadClass(String, boolean), | |
1348 // so the call to loadClassInternal() was not required. | |
1349 // | |
1350 // UnsyncloadClass flag means both call loadClass(String) and do | |
1351 // not acquire the class loader lock even for class loaders that are | |
1352 // not parallelCapable. This was a risky transitional | |
1353 // flag for diagnostic purposes only. It is risky to call | |
0 | 1354 // custom class loaders without synchronization. |
1355 // WARNING If a custom class loader does NOT synchronizer findClass, or callers of | |
514 | 1356 // findClass, the UnsyncloadClass flag risks unexpected timing bugs in the field. |
0 | 1357 // Do NOT assume this will be supported in future releases. |
514 | 1358 // |
1359 // Added MustCallLoadClassInternal in case we discover in the field | |
1360 // a customer that counts on this call | |
1361 if (MustCallLoadClassInternal && has_loadClassInternal()) { | |
0 | 1362 JavaCalls::call_special(&result, |
1363 class_loader, | |
1364 spec_klass, | |
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1365 vmSymbols::loadClassInternal_name(), |
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1366 vmSymbols::string_class_signature(), |
0 | 1367 string, |
1368 CHECK_(nh)); | |
1369 } else { | |
1370 JavaCalls::call_virtual(&result, | |
1371 class_loader, | |
1372 spec_klass, | |
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1373 vmSymbols::loadClass_name(), |
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1374 vmSymbols::string_class_signature(), |
0 | 1375 string, |
1376 CHECK_(nh)); | |
1377 } | |
1378 | |
1379 assert(result.get_type() == T_OBJECT, "just checking"); | |
1380 oop obj = (oop) result.get_jobject(); | |
1381 | |
1382 // Primitive classes return null since forName() can not be | |
1383 // used to obtain any of the Class objects representing primitives or void | |
1384 if ((obj != NULL) && !(java_lang_Class::is_primitive(obj))) { | |
1385 instanceKlassHandle k = | |
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1386 instanceKlassHandle(THREAD, java_lang_Class::as_Klass(obj)); |
0 | 1387 // For user defined Java class loaders, check that the name returned is |
1388 // the same as that requested. This check is done for the bootstrap | |
1389 // loader when parsing the class file. | |
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1390 if (class_name == k->name()) { |
0 | 1391 return k; |
1392 } | |
1393 } | |
1394 // Class is not found or has the wrong name, return NULL | |
1395 return nh; | |
1396 } | |
1397 } | |
1398 | |
1399 void SystemDictionary::define_instance_class(instanceKlassHandle k, TRAPS) { | |
1400 | |
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1401 ClassLoaderData* loader_data = k->class_loader_data(); |
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1402 Handle class_loader_h(THREAD, loader_data->class_loader()); |
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1403 |
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1404 for (uintx it = 0; it < GCExpandToAllocateDelayMillis; it++){} |
0 | 1405 |
514 | 1406 // for bootstrap and other parallel classloaders don't acquire lock, |
1407 // use placeholder token | |
1408 // If a parallelCapable class loader calls define_instance_class instead of | |
1409 // find_or_define_instance_class to get here, we have a timing | |
1410 // hole with systemDictionary updates and check_constraints | |
1411 if (!class_loader_h.is_null() && !is_parallelCapable(class_loader_h)) { | |
0 | 1412 assert(ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, |
1413 compute_loader_lock_object(class_loader_h, THREAD)), | |
1414 "define called without lock"); | |
1415 } | |
1416 | |
1417 // Check class-loading constraints. Throw exception if violation is detected. | |
1418 // Grabs and releases SystemDictionary_lock | |
1419 // The check_constraints/find_class call and update_dictionary sequence | |
1420 // must be "atomic" for a specific class/classloader pair so we never | |
1421 // define two different instanceKlasses for that class/classloader pair. | |
1422 // Existing classloaders will call define_instance_class with the | |
1423 // classloader lock held | |
1424 // Parallel classloaders will call find_or_define_instance_class | |
1425 // which will require a token to perform the define class | |
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1426 Symbol* name_h = k->name(); |
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1427 unsigned int d_hash = dictionary()->compute_hash(name_h, loader_data); |
0 | 1428 int d_index = dictionary()->hash_to_index(d_hash); |
1429 check_constraints(d_index, d_hash, k, class_loader_h, true, CHECK); | |
1430 | |
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1431 // Register class just loaded with class loader (placed in Vector) |
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1432 // Note we do this before updating the dictionary, as this can |
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1433 // fail with an OutOfMemoryError (if it does, we will *not* put this |
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1434 // class in the dictionary and will not update the class hierarchy). |
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1435 // JVMTI FollowReferences needs to find the classes this way. |
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1436 if (k->class_loader() != NULL) { |
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1437 methodHandle m(THREAD, Universe::loader_addClass_method()); |
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1438 JavaValue result(T_VOID); |
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1439 JavaCallArguments args(class_loader_h); |
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1440 args.push_oop(Handle(THREAD, k->java_mirror())); |
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1441 JavaCalls::call(&result, m, &args, CHECK); |
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1442 } |
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1443 |
0 | 1444 // Add the new class. We need recompile lock during update of CHA. |
1445 { | |
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1446 unsigned int p_hash = placeholders()->compute_hash(name_h, loader_data); |
0 | 1447 int p_index = placeholders()->hash_to_index(p_hash); |
1448 | |
1449 MutexLocker mu_r(Compile_lock, THREAD); | |
1450 | |
1451 // Add to class hierarchy, initialize vtables, and do possible | |
1452 // deoptimizations. | |
1453 add_to_hierarchy(k, CHECK); // No exception, but can block | |
1454 | |
1455 // Add to systemDictionary - so other classes can see it. | |
1456 // Grabs and releases SystemDictionary_lock | |
1457 update_dictionary(d_index, d_hash, p_index, p_hash, | |
1458 k, class_loader_h, THREAD); | |
1459 } | |
1460 k->eager_initialize(THREAD); | |
1461 | |
1462 // notify jvmti | |
1463 if (JvmtiExport::should_post_class_load()) { | |
1464 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); | |
1465 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); | |
1466 | |
1467 } | |
10405 | 1468 |
0 | 1469 } |
1470 | |
1471 // Support parallel classloading | |
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1472 // All parallel class loaders, including bootstrap classloader |
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1473 // lock a placeholder entry for this class/class_loader pair |
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1474 // to allow parallel defines of different classes for this class loader |
514 | 1475 // With AllowParallelDefine flag==true, in case they do not synchronize around |
1476 // FindLoadedClass/DefineClass, calls, we check for parallel | |
0 | 1477 // loading for them, wait if a defineClass is in progress |
1478 // and return the initial requestor's results | |
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1479 // This flag does not apply to the bootstrap classloader. |
514 | 1480 // With AllowParallelDefine flag==false, call through to define_instance_class |
1481 // which will throw LinkageError: duplicate class definition. | |
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1482 // False is the requested default. |
0 | 1483 // For better performance, the class loaders should synchronize |
514 | 1484 // findClass(), i.e. FindLoadedClass/DefineClassIfAbsent or they |
0 | 1485 // potentially waste time reading and parsing the bytestream. |
1486 // Note: VM callers should ensure consistency of k/class_name,class_loader | |
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1487 instanceKlassHandle SystemDictionary::find_or_define_instance_class(Symbol* class_name, Handle class_loader, instanceKlassHandle k, TRAPS) { |
0 | 1488 |
1489 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1490 Symbol* name_h = k->name(); // passed in class_name may be null |
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1491 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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1492 |
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1493 unsigned int d_hash = dictionary()->compute_hash(name_h, loader_data); |
0 | 1494 int d_index = dictionary()->hash_to_index(d_hash); |
1495 | |
1496 // Hold SD lock around find_class and placeholder creation for DEFINE_CLASS | |
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1497 unsigned int p_hash = placeholders()->compute_hash(name_h, loader_data); |
0 | 1498 int p_index = placeholders()->hash_to_index(p_hash); |
1499 PlaceholderEntry* probe; | |
1500 | |
1501 { | |
1502 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1503 // First check if class already defined | |
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1504 if (UnsyncloadClass || (is_parallelDefine(class_loader))) { |
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1505 Klass* check = find_class(d_index, d_hash, name_h, loader_data); |
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1506 if (check != NULL) { |
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1507 return(instanceKlassHandle(THREAD, check)); |
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1508 } |
0 | 1509 } |
1510 | |
1511 // Acquire define token for this class/classloader | |
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1512 probe = placeholders()->find_and_add(p_index, p_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, NULL, THREAD); |
514 | 1513 // Wait if another thread defining in parallel |
1514 // All threads wait - even those that will throw duplicate class: otherwise | |
1515 // caller is surprised by LinkageError: duplicate, but findLoadedClass fails | |
1516 // if other thread has not finished updating dictionary | |
1517 while (probe->definer() != NULL) { | |
1518 SystemDictionary_lock->wait(); | |
1519 } | |
1520 // Only special cases allow parallel defines and can use other thread's results | |
1521 // Other cases fall through, and may run into duplicate defines | |
1522 // caught by finding an entry in the SystemDictionary | |
6983 | 1523 if ((UnsyncloadClass || is_parallelDefine(class_loader)) && (probe->instance_klass() != NULL)) { |
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1524 placeholders()->find_and_remove(p_index, p_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, THREAD); |
514 | 1525 SystemDictionary_lock->notify_all(); |
0 | 1526 #ifdef ASSERT |
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1527 Klass* check = find_class(d_index, d_hash, name_h, loader_data); |
514 | 1528 assert(check != NULL, "definer missed recording success"); |
0 | 1529 #endif |
6983 | 1530 return(instanceKlassHandle(THREAD, probe->instance_klass())); |
0 | 1531 } else { |
514 | 1532 // This thread will define the class (even if earlier thread tried and had an error) |
1533 probe->set_definer(THREAD); | |
0 | 1534 } |
1535 } | |
1536 | |
1537 define_instance_class(k, THREAD); | |
1538 | |
1539 Handle linkage_exception = Handle(); // null handle | |
1540 | |
1541 // definer must notify any waiting threads | |
1542 { | |
1543 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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1544 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name_h, loader_data); |
0 | 1545 assert(probe != NULL, "DEFINE_CLASS placeholder lost?"); |
1546 if (probe != NULL) { | |
1547 if (HAS_PENDING_EXCEPTION) { | |
1548 linkage_exception = Handle(THREAD,PENDING_EXCEPTION); | |
1549 CLEAR_PENDING_EXCEPTION; | |
1550 } else { | |
6983 | 1551 probe->set_instance_klass(k()); |
0 | 1552 } |
1553 probe->set_definer(NULL); | |
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1554 placeholders()->find_and_remove(p_index, p_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, THREAD); |
0 | 1555 SystemDictionary_lock->notify_all(); |
1556 } | |
1557 } | |
1558 | |
1559 // Can't throw exception while holding lock due to rank ordering | |
1560 if (linkage_exception() != NULL) { | |
1561 THROW_OOP_(linkage_exception(), nh); // throws exception and returns | |
1562 } | |
1563 | |
1564 return k; | |
1565 } | |
1566 Handle SystemDictionary::compute_loader_lock_object(Handle class_loader, TRAPS) { | |
1567 // If class_loader is NULL we synchronize on _system_loader_lock_obj | |
1568 if (class_loader.is_null()) { | |
1569 return Handle(THREAD, _system_loader_lock_obj); | |
1570 } else { | |
1571 return class_loader; | |
1572 } | |
1573 } | |
1574 | |
1575 // This method is added to check how often we have to wait to grab loader | |
1576 // lock. The results are being recorded in the performance counters defined in | |
1577 // ClassLoader::_sync_systemLoaderLockContentionRate and | |
1578 // ClassLoader::_sync_nonSystemLoaderLockConteionRate. | |
1579 void SystemDictionary::check_loader_lock_contention(Handle loader_lock, TRAPS) { | |
1580 if (!UsePerfData) { | |
1581 return; | |
1582 } | |
1583 | |
1584 assert(!loader_lock.is_null(), "NULL lock object"); | |
1585 | |
1586 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader_lock) | |
1587 == ObjectSynchronizer::owner_other) { | |
1588 // contention will likely happen, so increment the corresponding | |
1589 // contention counter. | |
1590 if (loader_lock() == _system_loader_lock_obj) { | |
1591 ClassLoader::sync_systemLoaderLockContentionRate()->inc(); | |
1592 } else { | |
1593 ClassLoader::sync_nonSystemLoaderLockContentionRate()->inc(); | |
1594 } | |
1595 } | |
1596 } | |
1597 | |
1598 // ---------------------------------------------------------------------------- | |
1599 // Lookup | |
1600 | |
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1601 Klass* SystemDictionary::find_class(int index, unsigned int hash, |
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1602 Symbol* class_name, |
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1603 ClassLoaderData* loader_data) { |
0 | 1604 assert_locked_or_safepoint(SystemDictionary_lock); |
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1605 assert (index == dictionary()->index_for(class_name, loader_data), |
0 | 1606 "incorrect index?"); |
1607 | |
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1608 Klass* k = dictionary()->find_class(index, hash, class_name, loader_data); |
0 | 1609 return k; |
1610 } | |
1611 | |
1612 | |
1613 // Basic find on classes in the midst of being loaded | |
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1614 Symbol* SystemDictionary::find_placeholder(Symbol* class_name, |
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1615 ClassLoaderData* loader_data) { |
0 | 1616 assert_locked_or_safepoint(SystemDictionary_lock); |
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1617 unsigned int p_hash = placeholders()->compute_hash(class_name, loader_data); |
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1618 int p_index = placeholders()->hash_to_index(p_hash); |
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1619 return placeholders()->find_entry(p_index, p_hash, class_name, loader_data); |
0 | 1620 } |
1621 | |
1622 | |
1623 // Used for assertions and verification only | |
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1624 Klass* SystemDictionary::find_class(Symbol* class_name, ClassLoaderData* loader_data) { |
0 | 1625 #ifndef ASSERT |
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1626 guarantee(VerifyBeforeGC || |
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1627 VerifyDuringGC || |
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1628 VerifyBeforeExit || |
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1629 VerifyDuringStartup || |
0 | 1630 VerifyAfterGC, "too expensive"); |
1631 #endif | |
1632 assert_locked_or_safepoint(SystemDictionary_lock); | |
1633 | |
1634 // First look in the loaded class array | |
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1635 unsigned int d_hash = dictionary()->compute_hash(class_name, loader_data); |
0 | 1636 int d_index = dictionary()->hash_to_index(d_hash); |
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1637 return find_class(d_index, d_hash, class_name, loader_data); |
0 | 1638 } |
1639 | |
1640 | |
1641 // Get the next class in the diictionary. | |
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1642 Klass* SystemDictionary::try_get_next_class() { |
0 | 1643 return dictionary()->try_get_next_class(); |
1644 } | |
1645 | |
1646 | |
1647 // ---------------------------------------------------------------------------- | |
1648 // Update hierachy. This is done before the new klass has been added to the SystemDictionary. The Recompile_lock | |
1649 // is held, to ensure that the compiler is not using the class hierachy, and that deoptimization will kick in | |
1650 // before a new class is used. | |
1651 | |
1652 void SystemDictionary::add_to_hierarchy(instanceKlassHandle k, TRAPS) { | |
1653 assert(k.not_null(), "just checking"); | |
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1654 assert_locked_or_safepoint(Compile_lock); |
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1655 |
0 | 1656 // Link into hierachy. Make sure the vtables are initialized before linking into |
1657 k->append_to_sibling_list(); // add to superklass/sibling list | |
1658 k->process_interfaces(THREAD); // handle all "implements" declarations | |
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1659 k->set_init_state(InstanceKlass::loaded); |
0 | 1660 // Now flush all code that depended on old class hierarchy. |
1661 // Note: must be done *after* linking k into the hierarchy (was bug 12/9/97) | |
1662 // Also, first reinitialize vtable because it may have gotten out of synch | |
1663 // while the new class wasn't connected to the class hierarchy. | |
1664 Universe::flush_dependents_on(k); | |
1665 } | |
1666 | |
1667 | |
1668 // ---------------------------------------------------------------------------- | |
1669 // GC support | |
1670 | |
1671 // Following roots during mark-sweep is separated in two phases. | |
1672 // | |
1673 // The first phase follows preloaded classes and all other system | |
1674 // classes, since these will never get unloaded anyway. | |
1675 // | |
1676 // The second phase removes (unloads) unreachable classes from the | |
1677 // system dictionary and follows the remaining classes' contents. | |
1678 | |
1679 void SystemDictionary::always_strong_oops_do(OopClosure* blk) { | |
1680 blk->do_oop(&_java_system_loader); | |
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1681 blk->do_oop(&_system_loader_lock_obj); |
16395
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1682 #ifdef GRAAL |
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1683 blk->do_oop(&_graal_loader); |
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1684 #endif |
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1685 |
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1686 dictionary()->always_strong_oops_do(blk); |
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1687 |
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1688 // Visit extra methods |
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1689 invoke_method_table()->oops_do(blk); |
0 | 1690 } |
1691 | |
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1692 void SystemDictionary::always_strong_classes_do(KlassClosure* closure) { |
0 | 1693 // Follow all system classes and temporary placeholders in dictionary |
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1694 dictionary()->always_strong_classes_do(closure); |
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1695 |
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1696 // Placeholders. These represent classes we're actively loading. |
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1697 placeholders()->classes_do(closure); |
0 | 1698 } |
1699 | |
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1700 // Calculate a "good" systemdictionary size based |
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1701 // on predicted or current loaded classes count |
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1702 int SystemDictionary::calculate_systemdictionary_size(int classcount) { |
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1703 int newsize = _old_default_sdsize; |
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1704 if ((classcount > 0) && !DumpSharedSpaces) { |
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1705 int desiredsize = classcount/_average_depth_goal; |
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1706 for (newsize = _primelist[_sdgeneration]; _sdgeneration < _prime_array_size -1; |
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1707 newsize = _primelist[++_sdgeneration]) { |
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1708 if (desiredsize <= newsize) { |
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1709 break; |
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1710 } |
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1711 } |
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1712 } |
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1713 return newsize; |
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1714 } |
10405 | 1715 |
12837 | 1716 #ifdef ASSERT |
1717 class VerifySDReachableAndLiveClosure : public OopClosure { | |
1718 private: | |
1719 BoolObjectClosure* _is_alive; | |
1720 | |
1721 template <class T> void do_oop_work(T* p) { | |
1722 oop obj = oopDesc::load_decode_heap_oop(p); | |
1723 guarantee(_is_alive->do_object_b(obj), "Oop in system dictionary must be live"); | |
1724 } | |
1725 | |
1726 public: | |
1727 VerifySDReachableAndLiveClosure(BoolObjectClosure* is_alive) : OopClosure(), _is_alive(is_alive) { } | |
1728 | |
1729 virtual void do_oop(oop* p) { do_oop_work(p); } | |
1730 virtual void do_oop(narrowOop* p) { do_oop_work(p); } | |
1731 }; | |
1732 #endif | |
1733 | |
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1734 // Assumes classes in the SystemDictionary are only unloaded at a safepoint |
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1735 // Note: anonymous classes are not in the SD. |
0 | 1736 bool SystemDictionary::do_unloading(BoolObjectClosure* is_alive) { |
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1737 // First, mark for unload all ClassLoaderData referencing a dead class loader. |
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1738 bool has_dead_loaders = ClassLoaderDataGraph::do_unloading(is_alive); |
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1739 bool unloading_occurred = false; |
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1740 if (has_dead_loaders) { |
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1741 unloading_occurred = dictionary()->do_unloading(); |
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1742 constraints()->purge_loader_constraints(); |
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1743 resolution_errors()->purge_resolution_errors(); |
12837 | 1744 } |
1745 // Oops referenced by the system dictionary may get unreachable independently | |
1746 // of the class loader (eg. cached protection domain oops). So we need to | |
1747 // explicitly unlink them here instead of in Dictionary::do_unloading. | |
1748 dictionary()->unlink(is_alive); | |
1749 #ifdef ASSERT | |
1750 VerifySDReachableAndLiveClosure cl(is_alive); | |
1751 dictionary()->oops_do(&cl); | |
1752 #endif | |
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1753 return unloading_occurred; |
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1754 } |
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1755 |
0 | 1756 void SystemDictionary::oops_do(OopClosure* f) { |
1757 f->do_oop(&_java_system_loader); | |
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1758 f->do_oop(&_system_loader_lock_obj); |
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1759 #ifdef GRAAL |
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1760 f->do_oop(&_graal_loader); |
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1761 #endif |
0 | 1762 |
1763 // Adjust dictionary | |
1764 dictionary()->oops_do(f); | |
1765 | |
710 | 1766 // Visit extra methods |
1903 | 1767 invoke_method_table()->oops_do(f); |
0 | 1768 } |
1769 | |
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1770 // Extended Class redefinition support. |
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1771 // If one of these classes is replaced, we need to replace it in these places. |
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1772 // KlassClosure::do_klass should take the address of a class but we can |
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1773 // change that later. |
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1774 void SystemDictionary::preloaded_classes_do(KlassClosure* f) { |
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1775 for (int k = (int)FIRST_WKID; k < (int)WKID_LIMIT; k++) { |
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1776 f->do_klass(_well_known_klasses[k]); |
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1777 } |
0 | 1778 |
1779 { | |
1780 for (int i = 0; i < T_VOID+1; i++) { | |
1781 if (_box_klasses[i] != NULL) { | |
1782 assert(i >= T_BOOLEAN, "checking"); | |
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1783 f->do_klass(_box_klasses[i]); |
0 | 1784 } |
1785 } | |
1786 } | |
1787 | |
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1788 FilteredFieldsMap::classes_do(f); |
0 | 1789 } |
1790 | |
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1791 void SystemDictionary::lazily_loaded_classes_do(KlassClosure* f) { |
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1792 f->do_klass(_abstract_ownable_synchronizer_klass); |
0 | 1793 } |
1794 | |
1795 // Just the classes from defining class loaders | |
1796 // Don't iterate over placeholders | |
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1797 void SystemDictionary::classes_do(void f(Klass*)) { |
0 | 1798 dictionary()->classes_do(f); |
1799 } | |
1800 | |
1801 // Added for initialize_itable_for_klass | |
1802 // Just the classes from defining class loaders | |
1803 // Don't iterate over placeholders | |
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1804 void SystemDictionary::classes_do(void f(Klass*, TRAPS), TRAPS) { |
0 | 1805 dictionary()->classes_do(f, CHECK); |
1806 } | |
1807 | |
1808 // All classes, and their class loaders | |
1809 // Don't iterate over placeholders | |
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1810 void SystemDictionary::classes_do(void f(Klass*, ClassLoaderData*)) { |
0 | 1811 dictionary()->classes_do(f); |
1812 } | |
1813 | |
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1814 void SystemDictionary::placeholders_do(void f(Symbol*)) { |
0 | 1815 placeholders()->entries_do(f); |
1816 } | |
1817 | |
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1818 void SystemDictionary::methods_do(void f(Method*)) { |
0 | 1819 dictionary()->methods_do(f); |
1903 | 1820 invoke_method_table()->methods_do(f); |
0 | 1821 } |
1822 | |
1823 // ---------------------------------------------------------------------------- | |
1824 // Lazily load klasses | |
1825 | |
1826 void SystemDictionary::load_abstract_ownable_synchronizer_klass(TRAPS) { | |
1827 assert(JDK_Version::is_gte_jdk16x_version(), "Must be JDK 1.6 or later"); | |
1828 | |
1829 // if multiple threads calling this function, only one thread will load | |
1830 // the class. The other threads will find the loaded version once the | |
1831 // class is loaded. | |
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1832 Klass* aos = _abstract_ownable_synchronizer_klass; |
0 | 1833 if (aos == NULL) { |
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1834 Klass* k = resolve_or_fail(vmSymbols::java_util_concurrent_locks_AbstractOwnableSynchronizer(), true, CHECK); |
0 | 1835 // Force a fence to prevent any read before the write completes |
1836 OrderAccess::fence(); | |
1837 _abstract_ownable_synchronizer_klass = k; | |
1838 } | |
1839 } | |
1840 | |
1841 // ---------------------------------------------------------------------------- | |
1842 // Initialization | |
1843 | |
1844 void SystemDictionary::initialize(TRAPS) { | |
1845 // Allocate arrays | |
1846 assert(dictionary() == NULL, | |
1847 "SystemDictionary should only be initialized once"); | |
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1848 _sdgeneration = 0; |
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1849 _dictionary = new Dictionary(calculate_systemdictionary_size(PredictedLoadedClassCount)); |
1903 | 1850 _placeholders = new PlaceholderTable(_nof_buckets); |
0 | 1851 _number_of_modifications = 0; |
1903 | 1852 _loader_constraints = new LoaderConstraintTable(_loader_constraint_size); |
1853 _resolution_errors = new ResolutionErrorTable(_resolution_error_size); | |
1854 _invoke_method_table = new SymbolPropertyTable(_invoke_method_size); | |
0 | 1855 |
1856 // Allocate private object used as system class loader lock | |
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1857 _system_loader_lock_obj = oopFactory::new_intArray(0, CHECK); |
0 | 1858 // Initialize basic classes |
1859 initialize_preloaded_classes(CHECK); | |
1860 } | |
1861 | |
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1862 // Compact table of directions on the initialization of klasses: |
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1863 static const short wk_init_info[] = { |
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1864 #define WK_KLASS_INIT_INFO(name, symbol, option) \ |
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1865 ( ((int)vmSymbols::VM_SYMBOL_ENUM_NAME(symbol) \ |
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1866 << SystemDictionary::CEIL_LG_OPTION_LIMIT) \ |
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1867 | (int)SystemDictionary::option ), |
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1868 WK_KLASSES_DO(WK_KLASS_INIT_INFO) |
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1869 #undef WK_KLASS_INIT_INFO |
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1870 0 |
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1871 }; |
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1872 |
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1873 bool SystemDictionary::initialize_wk_klass(WKID id, int init_opt, TRAPS) { |
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1874 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1875 int info = wk_init_info[id - FIRST_WKID]; |
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1876 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
2177
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1877 Symbol* symbol = vmSymbols::symbol_at((vmSymbols::SID)sid); |
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1878 Klass** klassp = &_well_known_klasses[id]; |
2460 | 1879 bool must_load = (init_opt < SystemDictionary::Opt); |
7951 | 1880 if ((*klassp) == NULL) { |
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1881 #ifdef GRAAL |
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1882 bool is_graal = init_opt == SystemDictionary::Graal; |
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1883 assert(is_graal == (id >= (int)FIRST_GRAAL_WKID && id <= (int)LAST_GRAAL_WKID), |
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1884 "Graal WKIDs must be contiguous and separate from non-Graal WKIDs"); |
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1885 if (is_graal) { |
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1886 (*klassp) = resolve_or_fail(symbol, _graal_loader, Handle(), true, CHECK_0); // load required Graal class |
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1887 } else |
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1888 #endif |
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1889 if (must_load) { |
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1890 (*klassp) = resolve_or_fail(symbol, true, CHECK_0); // load required class |
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1891 } else { |
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1892 (*klassp) = resolve_or_null(symbol, CHECK_0); // load optional klass |
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1893 } |
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1894 } |
2460 | 1895 return ((*klassp) != NULL); |
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1896 } |
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1897 |
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1898 void SystemDictionary::initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS) { |
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1899 assert((int)start_id <= (int)limit_id, "IDs are out of order!"); |
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1900 for (int id = (int)start_id; id < (int)limit_id; id++) { |
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1901 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1902 int info = wk_init_info[id - FIRST_WKID]; |
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1903 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1904 int opt = (info & right_n_bits(CEIL_LG_OPTION_LIMIT)); |
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1905 |
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1906 initialize_wk_klass((WKID)id, opt, CHECK); |
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1907 } |
710 | 1908 |
1909 // move the starting value forward to the limit: | |
1910 start_id = limit_id; | |
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1911 } |
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1912 |
0 | 1913 void SystemDictionary::initialize_preloaded_classes(TRAPS) { |
1142 | 1914 assert(WK_KLASS(Object_klass) == NULL, "preloaded classes should only be initialized once"); |
0 | 1915 // Preload commonly used klasses |
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1916 WKID scan = FIRST_WKID; |
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1917 // first do Object, then String, Class |
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1918 if (UseSharedSpaces) { |
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1919 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Object_klass), scan, CHECK); |
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1920 // Initialize the constant pool for the Object_class |
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1921 InstanceKlass* ik = InstanceKlass::cast(Object_klass()); |
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1922 ik->constants()->restore_unshareable_info(CHECK); |
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1923 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
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1924 } else { |
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1925 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
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1926 } |
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1927 |
6057 | 1928 // Calculate offsets for String and Class classes since they are loaded and |
1929 // can be used after this point. | |
1930 java_lang_String::compute_offsets(); | |
3938 | 1931 java_lang_Class::compute_offsets(); |
132
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1932 |
0 | 1933 // Fixup mirrors for classes loaded before java.lang.Class. |
1934 // These calls iterate over the objects currently in the perm gen | |
1935 // so calling them at this point is matters (not before when there | |
1936 // are fewer objects and not later after there are more objects | |
1937 // in the perm gen. | |
1938 Universe::initialize_basic_type_mirrors(CHECK); | |
1939 Universe::fixup_mirrors(CHECK); | |
1940 | |
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1941 // do a bunch more: |
1142 | 1942 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Reference_klass), scan, CHECK); |
0 | 1943 |
1944 // Preload ref klasses and set reference types | |
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1945 InstanceKlass::cast(WK_KLASS(Reference_klass))->set_reference_type(REF_OTHER); |
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1946 InstanceRefKlass::update_nonstatic_oop_maps(WK_KLASS(Reference_klass)); |
0 | 1947 |
1142 | 1948 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(PhantomReference_klass), scan, CHECK); |
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1949 InstanceKlass::cast(WK_KLASS(SoftReference_klass))->set_reference_type(REF_SOFT); |
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1950 InstanceKlass::cast(WK_KLASS(WeakReference_klass))->set_reference_type(REF_WEAK); |
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1951 InstanceKlass::cast(WK_KLASS(FinalReference_klass))->set_reference_type(REF_FINAL); |
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1952 InstanceKlass::cast(WK_KLASS(PhantomReference_klass))->set_reference_type(REF_PHANTOM); |
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1953 |
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1954 // JSR 292 classes |
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1955 WKID jsr292_group_start = WK_KLASS_ENUM_NAME(MethodHandle_klass); |
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1956 WKID jsr292_group_end = WK_KLASS_ENUM_NAME(VolatileCallSite_klass); |
2416
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1957 initialize_wk_klasses_until(jsr292_group_start, scan, CHECK); |
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1958 if (EnableInvokeDynamic) { |
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1959 initialize_wk_klasses_through(jsr292_group_end, scan, CHECK); |
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1960 } else { |
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1961 // Skip the JSR 292 classes, if not enabled. |
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1962 scan = WKID(jsr292_group_end + 1); |
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1963 } |
710 | 1964 |
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1965 initialize_wk_klasses_until(NOT_GRAAL(WKID_LIMIT) GRAAL_ONLY(FIRST_GRAAL_WKID), scan, CHECK); |
0 | 1966 |
1142 | 1967 _box_klasses[T_BOOLEAN] = WK_KLASS(Boolean_klass); |
1968 _box_klasses[T_CHAR] = WK_KLASS(Character_klass); | |
1969 _box_klasses[T_FLOAT] = WK_KLASS(Float_klass); | |
1970 _box_klasses[T_DOUBLE] = WK_KLASS(Double_klass); | |
1971 _box_klasses[T_BYTE] = WK_KLASS(Byte_klass); | |
1972 _box_klasses[T_SHORT] = WK_KLASS(Short_klass); | |
1973 _box_klasses[T_INT] = WK_KLASS(Integer_klass); | |
1974 _box_klasses[T_LONG] = WK_KLASS(Long_klass); | |
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1975 //_box_klasses[T_OBJECT] = WK_KLASS(object_klass); |
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1976 //_box_klasses[T_ARRAY] = WK_KLASS(object_klass); |
0 | 1977 |
1978 { // Compute whether we should use loadClass or loadClassInternal when loading classes. | |
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1979 Method* method = InstanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::loadClassInternal_name(), vmSymbols::string_class_signature()); |
0 | 1980 _has_loadClassInternal = (method != NULL); |
1981 } | |
1982 { // Compute whether we should use checkPackageAccess or NOT | |
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1983 Method* method = InstanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::checkPackageAccess_name(), vmSymbols::class_protectiondomain_signature()); |
0 | 1984 _has_checkPackageAccess = (method != NULL); |
1985 } | |
1986 } | |
1987 | |
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1988 #ifdef GRAAL |
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1989 void SystemDictionary::initialize_preloaded_graal_classes(TRAPS) { |
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1990 assert(WK_KLASS(CompilerThread_klass) == NULL, "preloaded Graal classes should only be initialized once"); |
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1991 if (UseGraalClassLoader) { |
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1992 _graal_loader = GraalRuntime::compute_graal_class_loader(CHECK); |
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1993 } |
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1994 |
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1995 WKID scan = FIRST_GRAAL_WKID; |
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1996 initialize_wk_klasses_through(LAST_GRAAL_WKID, scan, CHECK); |
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1997 } |
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1998 #endif |
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1999 |
0 | 2000 // Tells if a given klass is a box (wrapper class, such as java.lang.Integer). |
2001 // If so, returns the basic type it holds. If not, returns T_OBJECT. | |
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2002 BasicType SystemDictionary::box_klass_type(Klass* k) { |
0 | 2003 assert(k != NULL, ""); |
2004 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { | |
2005 if (_box_klasses[i] == k) | |
2006 return (BasicType)i; | |
2007 } | |
2008 return T_OBJECT; | |
2009 } | |
2010 | |
2011 // Constraints on class loaders. The details of the algorithm can be | |
2012 // found in the OOPSLA'98 paper "Dynamic Class Loading in the Java | |
2013 // Virtual Machine" by Sheng Liang and Gilad Bracha. The basic idea is | |
2014 // that the system dictionary needs to maintain a set of contraints that | |
2015 // must be satisfied by all classes in the dictionary. | |
2016 // if defining is true, then LinkageError if already in systemDictionary | |
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2017 // if initiating loader, then ok if InstanceKlass matches existing entry |
0 | 2018 |
2019 void SystemDictionary::check_constraints(int d_index, unsigned int d_hash, | |
2020 instanceKlassHandle k, | |
2021 Handle class_loader, bool defining, | |
2022 TRAPS) { | |
2023 const char *linkage_error = NULL; | |
2024 { | |
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2025 Symbol* name = k->name(); |
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2026 ClassLoaderData *loader_data = class_loader_data(class_loader); |
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2027 |
0 | 2028 MutexLocker mu(SystemDictionary_lock, THREAD); |
2029 | |
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2030 Klass* check = find_class(d_index, d_hash, name, loader_data); |
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2031 if (check != (Klass*)NULL) { |
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2032 // if different InstanceKlass - duplicate class definition, |
0 | 2033 // else - ok, class loaded by a different thread in parallel, |
2034 // we should only have found it if it was done loading and ok to use | |
2035 // system dictionary only holds instance classes, placeholders | |
2036 // also holds array classes | |
2037 | |
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2038 assert(check->oop_is_instance(), "noninstance in systemdictionary"); |
0 | 2039 if ((defining == true) || (k() != check)) { |
2040 linkage_error = "loader (instance of %s): attempted duplicate class " | |
2041 "definition for name: \"%s\""; | |
2042 } else { | |
2043 return; | |
2044 } | |
2045 } | |
2046 | |
2047 #ifdef ASSERT | |
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2048 Symbol* ph_check = find_placeholder(name, loader_data); |
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2049 assert(ph_check == NULL || ph_check == name, "invalid symbol"); |
0 | 2050 #endif |
2051 | |
2052 if (linkage_error == NULL) { | |
2053 if (constraints()->check_or_update(k, class_loader, name) == false) { | |
2054 linkage_error = "loader constraint violation: loader (instance of %s)" | |
2055 " previously initiated loading for a different type with name \"%s\""; | |
2056 } | |
2057 } | |
2058 } | |
2059 | |
2060 // Throw error now if needed (cannot throw while holding | |
2061 // SystemDictionary_lock because of rank ordering) | |
2062 | |
2063 if (linkage_error) { | |
2064 ResourceMark rm(THREAD); | |
2065 const char* class_loader_name = loader_name(class_loader()); | |
2066 char* type_name = k->name()->as_C_string(); | |
2067 size_t buflen = strlen(linkage_error) + strlen(class_loader_name) + | |
2068 strlen(type_name); | |
2069 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
2070 jio_snprintf(buf, buflen, linkage_error, class_loader_name, type_name); | |
2071 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); | |
2072 } | |
2073 } | |
2074 | |
2075 | |
2076 // Update system dictionary - done after check_constraint and add_to_hierachy | |
2077 // have been called. | |
2078 void SystemDictionary::update_dictionary(int d_index, unsigned int d_hash, | |
2079 int p_index, unsigned int p_hash, | |
2080 instanceKlassHandle k, | |
2081 Handle class_loader, | |
2082 TRAPS) { | |
2083 // Compile_lock prevents systemDictionary updates during compilations | |
2084 assert_locked_or_safepoint(Compile_lock); | |
2177
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2085 Symbol* name = k->name(); |
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2086 ClassLoaderData *loader_data = class_loader_data(class_loader); |
0 | 2087 |
2088 { | |
2089 MutexLocker mu1(SystemDictionary_lock, THREAD); | |
2090 | |
2091 // See whether biased locking is enabled and if so set it for this | |
2092 // klass. | |
2093 // Note that this must be done past the last potential blocking | |
2094 // point / safepoint. We enable biased locking lazily using a | |
2095 // VM_Operation to iterate the SystemDictionary and installing the | |
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2096 // biasable mark word into each InstanceKlass's prototype header. |
0 | 2097 // To avoid race conditions where we accidentally miss enabling the |
2098 // optimization for one class in the process of being added to the | |
2099 // dictionary, we must not safepoint after the test of | |
2100 // BiasedLocking::enabled(). | |
2101 if (UseBiasedLocking && BiasedLocking::enabled()) { | |
2102 // Set biased locking bit for all loaded classes; it will be | |
2103 // cleared if revocation occurs too often for this type | |
2104 // NOTE that we must only do this when the class is initally | |
2105 // defined, not each time it is referenced from a new class loader | |
2106 if (k->class_loader() == class_loader()) { | |
2107 k->set_prototype_header(markOopDesc::biased_locking_prototype()); | |
2108 } | |
2109 } | |
2110 | |
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2111 // Make a new system dictionary entry. |
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2112 Klass* sd_check = find_class(d_index, d_hash, name, loader_data); |
0 | 2113 if (sd_check == NULL) { |
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2114 dictionary()->add_klass(name, loader_data, k); |
0 | 2115 notice_modification(); |
2116 } | |
2117 #ifdef ASSERT | |
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2118 sd_check = find_class(d_index, d_hash, name, loader_data); |
0 | 2119 assert (sd_check != NULL, "should have entry in system dictionary"); |
7582
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2120 // Note: there may be a placeholder entry: for circularity testing |
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2121 // or for parallel defines |
0 | 2122 #endif |
2123 SystemDictionary_lock->notify_all(); | |
2124 } | |
2125 } | |
2126 | |
2127 | |
2244
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2128 // Try to find a class name using the loader constraints. The |
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2129 // loader constraints might know about a class that isn't fully loaded |
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2130 // yet and these will be ignored. |
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2131 Klass* SystemDictionary::find_constrained_instance_or_array_klass( |
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2132 Symbol* class_name, Handle class_loader, TRAPS) { |
0 | 2133 |
2134 // First see if it has been loaded directly. | |
2135 // Force the protection domain to be null. (This removes protection checks.) | |
2136 Handle no_protection_domain; | |
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2137 Klass* klass = find_instance_or_array_klass(class_name, class_loader, |
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2138 no_protection_domain, CHECK_NULL); |
0 | 2139 if (klass != NULL) |
2140 return klass; | |
2141 | |
2142 // Now look to see if it has been loaded elsewhere, and is subject to | |
2143 // a loader constraint that would require this loader to return the | |
2144 // klass that is already loaded. | |
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2145 if (FieldType::is_array(class_name)) { |
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2146 // For array classes, their Klass*s are not kept in the |
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2147 // constraint table. The element Klass*s are. |
2177
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2148 FieldArrayInfo fd; |
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2149 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
0 | 2150 if (t != T_OBJECT) { |
2151 klass = Universe::typeArrayKlassObj(t); | |
2152 } else { | |
2153 MutexLocker mu(SystemDictionary_lock, THREAD); | |
2177
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2154 klass = constraints()->find_constrained_klass(fd.object_key(), class_loader); |
0 | 2155 } |
1336 | 2156 // If element class already loaded, allocate array klass |
0 | 2157 if (klass != NULL) { |
6983 | 2158 klass = klass->array_klass_or_null(fd.dimension()); |
0 | 2159 } |
2160 } else { | |
2161 MutexLocker mu(SystemDictionary_lock, THREAD); | |
2162 // Non-array classes are easy: simply check the constraint table. | |
2163 klass = constraints()->find_constrained_klass(class_name, class_loader); | |
2164 } | |
2165 | |
2166 return klass; | |
2167 } | |
2168 | |
2169 | |
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2170 bool SystemDictionary::add_loader_constraint(Symbol* class_name, |
0 | 2171 Handle class_loader1, |
2172 Handle class_loader2, | |
2173 Thread* THREAD) { | |
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2174 ClassLoaderData* loader_data1 = class_loader_data(class_loader1); |
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2175 ClassLoaderData* loader_data2 = class_loader_data(class_loader2); |
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2176 |
2177
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2177 Symbol* constraint_name = NULL; |
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2178 if (!FieldType::is_array(class_name)) { |
1336 | 2179 constraint_name = class_name; |
2180 } else { | |
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2181 // For array classes, their Klass*s are not kept in the |
1336 | 2182 // constraint table. The element classes are. |
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2183 FieldArrayInfo fd; |
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2184 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(false)); |
1336 | 2185 // primitive types always pass |
2186 if (t != T_OBJECT) { | |
2187 return true; | |
2188 } else { | |
2177
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2189 constraint_name = fd.object_key(); |
1336 | 2190 } |
2191 } | |
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2192 unsigned int d_hash1 = dictionary()->compute_hash(constraint_name, loader_data1); |
0 | 2193 int d_index1 = dictionary()->hash_to_index(d_hash1); |
2194 | |
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2195 unsigned int d_hash2 = dictionary()->compute_hash(constraint_name, loader_data2); |
0 | 2196 int d_index2 = dictionary()->hash_to_index(d_hash2); |
2197 { | |
1336 | 2198 MutexLocker mu_s(SystemDictionary_lock, THREAD); |
0 | 2199 |
1336 | 2200 // Better never do a GC while we're holding these oops |
2201 No_Safepoint_Verifier nosafepoint; | |
0 | 2202 |
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2203 Klass* klass1 = find_class(d_index1, d_hash1, constraint_name, loader_data1); |
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2204 Klass* klass2 = find_class(d_index2, d_hash2, constraint_name, loader_data2); |
1336 | 2205 return constraints()->add_entry(constraint_name, klass1, class_loader1, |
2206 klass2, class_loader2); | |
0 | 2207 } |
2208 } | |
2209 | |
2210 // Add entry to resolution error table to record the error when the first | |
2211 // attempt to resolve a reference to a class has failed. | |
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2212 void SystemDictionary::add_resolution_error(constantPoolHandle pool, int which, Symbol* error) { |
0 | 2213 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
2214 int index = resolution_errors()->hash_to_index(hash); | |
2215 { | |
2216 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
2217 resolution_errors()->add_entry(index, hash, pool, which, error); | |
2218 } | |
2219 } | |
2220 | |
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2221 // Delete a resolution error for RedefineClasses for a constant pool is going away |
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2222 void SystemDictionary::delete_resolution_error(ConstantPool* pool) { |
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2223 resolution_errors()->delete_entry(pool); |
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2224 } |
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2225 |
0 | 2226 // Lookup resolution error table. Returns error if found, otherwise NULL. |
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2227 Symbol* SystemDictionary::find_resolution_error(constantPoolHandle pool, int which) { |
0 | 2228 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
2229 int index = resolution_errors()->hash_to_index(hash); | |
2230 { | |
2231 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
2232 ResolutionErrorEntry* entry = resolution_errors()->find_entry(index, hash, pool, which); | |
2177
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2233 return (entry != NULL) ? entry->error() : (Symbol*)NULL; |
0 | 2234 } |
2235 } | |
2236 | |
2237 | |
665
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2238 // Signature constraints ensure that callers and callees agree about |
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2239 // the meaning of type names in their signatures. This routine is the |
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2240 // intake for constraints. It collects them from several places: |
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2241 // |
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2242 // * LinkResolver::resolve_method (if check_access is true) requires |
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2243 // that the resolving class (the caller) and the defining class of |
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2244 // the resolved method (the callee) agree on each type in the |
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2245 // method's signature. |
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2246 // |
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2247 // * LinkResolver::resolve_interface_method performs exactly the same |
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2248 // checks. |
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2249 // |
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2250 // * LinkResolver::resolve_field requires that the constant pool |
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2251 // attempting to link to a field agree with the field's defining |
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2252 // class about the type of the field signature. |
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2253 // |
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2254 // * klassVtable::initialize_vtable requires that, when a class |
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2255 // overrides a vtable entry allocated by a superclass, that the |
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2256 // overriding method (i.e., the callee) agree with the superclass |
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2257 // on each type in the method's signature. |
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2258 // |
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2259 // * klassItable::initialize_itable requires that, when a class fills |
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2260 // in its itables, for each non-abstract method installed in an |
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2261 // itable, the method (i.e., the callee) agree with the interface |
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2262 // on each type in the method's signature. |
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2263 // |
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2264 // All those methods have a boolean (check_access, checkconstraints) |
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2265 // which turns off the checks. This is used from specialized contexts |
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2266 // such as bootstrapping, dumping, and debugging. |
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2267 // |
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2268 // No direct constraint is placed between the class and its |
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2269 // supertypes. Constraints are only placed along linked relations |
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2270 // between callers and callees. When a method overrides or implements |
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2271 // an abstract method in a supertype (superclass or interface), the |
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2272 // constraints are placed as if the supertype were the caller to the |
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2273 // overriding method. (This works well, since callers to the |
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2274 // supertype have already established agreement between themselves and |
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2275 // the supertype.) As a result of all this, a class can disagree with |
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2276 // its supertype about the meaning of a type name, as long as that |
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2277 // class neither calls a relevant method of the supertype, nor is |
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2278 // called (perhaps via an override) from the supertype. |
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2279 // |
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2280 // |
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2281 // SystemDictionary::check_signature_loaders(sig, l1, l2) |
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2282 // |
0 | 2283 // Make sure all class components (including arrays) in the given |
2284 // signature will be resolved to the same class in both loaders. | |
2285 // Returns the name of the type that failed a loader constraint check, or | |
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2286 // NULL if no constraint failed. No exception except OOME is thrown. |
1336 | 2287 // Arrays are not added to the loader constraint table, their elements are. |
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2288 Symbol* SystemDictionary::check_signature_loaders(Symbol* signature, |
0 | 2289 Handle loader1, Handle loader2, |
2290 bool is_method, TRAPS) { | |
2291 // Nothing to do if loaders are the same. | |
2292 if (loader1() == loader2()) { | |
2293 return NULL; | |
2294 } | |
2295 | |
2296 SignatureStream sig_strm(signature, is_method); | |
2297 while (!sig_strm.is_done()) { | |
2298 if (sig_strm.is_object()) { | |
8840
cd3089a56438
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acorn
parents:
8751
diff
changeset
|
2299 Symbol* sig = sig_strm.as_symbol(CHECK_NULL); |
0 | 2300 if (!add_loader_constraint(sig, loader1, loader2, THREAD)) { |
8840
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8751
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|
2301 return sig; |
0 | 2302 } |
2303 } | |
2304 sig_strm.next(); | |
2305 } | |
2306 return NULL; | |
2307 } | |
2308 | |
2309 | |
6266
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|
2310 methodHandle SystemDictionary::find_method_handle_intrinsic(vmIntrinsics::ID iid, |
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|
2311 Symbol* signature, |
1d7922586cf6
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|
2312 TRAPS) { |
1d7922586cf6
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|
2313 methodHandle empty; |
1d7922586cf6
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|
2314 assert(EnableInvokeDynamic, ""); |
1d7922586cf6
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|
2315 assert(MethodHandles::is_signature_polymorphic(iid) && |
1d7922586cf6
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|
2316 MethodHandles::is_signature_polymorphic_intrinsic(iid) && |
1d7922586cf6
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|
2317 iid != vmIntrinsics::_invokeGeneric, |
1d7922586cf6
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|
2318 err_msg("must be a known MH intrinsic iid=%d: %s", iid, vmIntrinsics::name_at(iid))); |
1d7922586cf6
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|
2319 |
1d7922586cf6
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|
2320 unsigned int hash = invoke_method_table()->compute_hash(signature, iid); |
710 | 2321 int index = invoke_method_table()->hash_to_index(hash); |
6266
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2322 SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, iid); |
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|
2323 methodHandle m; |
6725
da91efe96a93
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|
2324 if (spe == NULL || spe->method() == NULL) { |
1508
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2325 spe = NULL; |
710 | 2326 // Must create lots of stuff here, but outside of the SystemDictionary lock. |
6725
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6964458: Reimplement class meta-data storage to use native memory
coleenp
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|
2327 m = Method::make_method_handle_intrinsic(iid, signature, CHECK_(empty)); |
16348
fefb82b01d6f
Make find_method_handle_intrinsic work in Xint mode
Gilles Duboscq <duboscq@ssw.jku.at>
parents:
16139
diff
changeset
|
2328 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_highest_tier, |
6266
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|
2329 methodHandle(), CompileThreshold, "MH", CHECK_(empty)); |
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|
2330 |
710 | 2331 // Now grab the lock. We might have to throw away the new method, |
2332 // if a racing thread has managed to install one at the same time. | |
6266
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|
2333 { |
1d7922586cf6
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|
2334 MutexLocker ml(SystemDictionary_lock, THREAD); |
1d7922586cf6
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|
2335 spe = invoke_method_table()->find_entry(index, hash, signature, iid); |
710 | 2336 if (spe == NULL) |
6266
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2337 spe = invoke_method_table()->add_entry(index, hash, signature, iid); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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2338 if (spe->method() == NULL) |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
2339 spe->set_method(m()); |
6266
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|
2340 } |
16139
b7a1ece4f07b
Make sure that there is always a nmethod available for the method handle intrinsics.
Gilles Duboscq <duboscq@ssw.jku.at>
parents:
15463
diff
changeset
|
2341 } else if (spe->method()->code() == NULL) { |
16348
fefb82b01d6f
Make find_method_handle_intrinsic work in Xint mode
Gilles Duboscq <duboscq@ssw.jku.at>
parents:
16139
diff
changeset
|
2342 CompileBroker::compile_method(spe->method(), InvocationEntryBci, CompLevel_highest_tier, |
16139
b7a1ece4f07b
Make sure that there is always a nmethod available for the method handle intrinsics.
Gilles Duboscq <duboscq@ssw.jku.at>
parents:
15463
diff
changeset
|
2343 methodHandle(), CompileThreshold, "MH", CHECK_(empty)); |
6266
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|
2344 } |
1d7922586cf6
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|
2345 |
16348
fefb82b01d6f
Make find_method_handle_intrinsic work in Xint mode
Gilles Duboscq <duboscq@ssw.jku.at>
parents:
16139
diff
changeset
|
2346 guarantee(spe != NULL && spe->method() != NULL && (!UseCompiler || spe->method()->code() != NULL), "Could not compile a method handle intrinsic"); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6266
diff
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|
2347 return spe->method(); |
6266
1d7922586cf6
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parents:
6217
diff
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|
2348 } |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2349 |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
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parents:
6217
diff
changeset
|
2350 // Helper for unpacking the return value from linkMethod and linkCallSite. |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2351 static methodHandle unpack_method_and_appendix(Handle mname, |
7185
90273fc0a981
8000662: NPG: nashorn ant clean test262 out-of-memory with Java heap
coleenp
parents:
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diff
changeset
|
2352 KlassHandle accessing_klass, |
6266
1d7922586cf6
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diff
changeset
|
2353 objArrayHandle appendix_box, |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
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6217
diff
changeset
|
2354 Handle* appendix_result, |
1d7922586cf6
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twisti
parents:
6217
diff
changeset
|
2355 TRAPS) { |
1d7922586cf6
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parents:
6217
diff
changeset
|
2356 methodHandle empty; |
1d7922586cf6
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parents:
6217
diff
changeset
|
2357 if (mname.not_null()) { |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
2358 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); |
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
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parents:
6217
diff
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|
2359 if (vmtarget != NULL && vmtarget->is_method()) { |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6266
diff
changeset
|
2360 Method* m = (Method*)vmtarget; |
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
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6217
diff
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|
2361 oop appendix = appendix_box->obj_at(0); |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2362 if (TraceMethodHandles) { |
1d7922586cf6
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twisti
parents:
6217
diff
changeset
|
2363 #ifndef PRODUCT |
1d7922586cf6
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twisti
parents:
6217
diff
changeset
|
2364 tty->print("Linked method="INTPTR_FORMAT": ", m); |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2365 m->print(); |
1d7922586cf6
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twisti
parents:
6217
diff
changeset
|
2366 if (appendix != NULL) { tty->print("appendix = "); appendix->print(); } |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
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|
2367 tty->cr(); |
1d7922586cf6
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twisti
parents:
6217
diff
changeset
|
2368 #endif //PRODUCT |
3363
167b70ff3abc
6939861: JVM should handle more conversion operations
never
parents:
3245
diff
changeset
|
2369 } |
6266
1d7922586cf6
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|
2370 (*appendix_result) = Handle(THREAD, appendix); |
7185
90273fc0a981
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coleenp
parents:
6983
diff
changeset
|
2371 // the target is stored in the cpCache and if a reference to this |
90273fc0a981
8000662: NPG: nashorn ant clean test262 out-of-memory with Java heap
coleenp
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|
2372 // MethodName is dropped we need a way to make sure the |
90273fc0a981
8000662: NPG: nashorn ant clean test262 out-of-memory with Java heap
coleenp
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changeset
|
2373 // class_loader containing this method is kept alive. |
90273fc0a981
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coleenp
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|
2374 // FIXME: the appendix might also preserve this dependency. |
90273fc0a981
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coleenp
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|
2375 ClassLoaderData* this_key = InstanceKlass::cast(accessing_klass())->class_loader_data(); |
90273fc0a981
8000662: NPG: nashorn ant clean test262 out-of-memory with Java heap
coleenp
parents:
6983
diff
changeset
|
2376 this_key->record_dependency(m->method_holder(), CHECK_NULL); // Can throw OOM |
6266
1d7922586cf6
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|
2377 return methodHandle(THREAD, m); |
710 | 2378 } |
2379 } | |
6266
1d7922586cf6
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|
2380 THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad value from MethodHandleNatives", empty); |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
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6217
diff
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|
2381 return empty; |
1d7922586cf6
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twisti
parents:
6217
diff
changeset
|
2382 } |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
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6217
diff
changeset
|
2383 |
1d7922586cf6
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6217
diff
changeset
|
2384 methodHandle SystemDictionary::find_method_handle_invoker(Symbol* name, |
1d7922586cf6
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twisti
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6217
diff
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|
2385 Symbol* signature, |
1d7922586cf6
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parents:
6217
diff
changeset
|
2386 KlassHandle accessing_klass, |
6822
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7200949: JSR 292: rubybench/bench/time/bench_base64.rb fails with jruby.jar not on boot class path
twisti
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diff
changeset
|
2387 Handle *appendix_result, |
f6b0eb4e44cf
7200949: JSR 292: rubybench/bench/time/bench_base64.rb fails with jruby.jar not on boot class path
twisti
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diff
changeset
|
2388 Handle *method_type_result, |
6266
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diff
changeset
|
2389 TRAPS) { |
1d7922586cf6
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parents:
6217
diff
changeset
|
2390 methodHandle empty; |
1d7922586cf6
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6217
diff
changeset
|
2391 assert(EnableInvokeDynamic, ""); |
15463
a20be10ad437
made Graal work with the HotSpot compiler queue and compiler threads, enabled by -XX:-UseGraalCompilationQueue
Doug Simon <doug.simon@oracle.com>
parents:
14909
diff
changeset
|
2392 assert(THREAD->can_call_java() ,""); |
6266
1d7922586cf6
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|
2393 Handle method_type = |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
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6217
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changeset
|
2394 SystemDictionary::find_method_handle_type(signature, accessing_klass, CHECK_(empty)); |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
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parents:
6217
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changeset
|
2395 if (false) { // FIXME: Decide if the Java upcall should resolve signatures. |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
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parents:
6217
diff
changeset
|
2396 method_type = java_lang_String::create_from_symbol(signature, CHECK_(empty)); |
1508
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
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|
2397 } |
6266
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|
2398 |
6725
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|
2399 KlassHandle mh_klass = SystemDictionary::MethodHandle_klass(); |
6266
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|
2400 int ref_kind = JVM_REF_invokeVirtual; |
1d7922586cf6
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twisti
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|
2401 Handle name_str = StringTable::intern(name, CHECK_(empty)); |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
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|
2402 objArrayHandle appendix_box = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1, CHECK_(empty)); |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
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|
2403 assert(appendix_box->obj_at(0) == NULL, ""); |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
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|
2404 |
12970
1c90f0072f0d
8026502: java/lang/invoke/MethodHandleConstants.java fails on all platforms
twisti
parents:
12837
diff
changeset
|
2405 // This should not happen. JDK code should take care of that. |
1c90f0072f0d
8026502: java/lang/invoke/MethodHandleConstants.java fails on all platforms
twisti
parents:
12837
diff
changeset
|
2406 if (accessing_klass.is_null() || method_type.is_null()) { |
1c90f0072f0d
8026502: java/lang/invoke/MethodHandleConstants.java fails on all platforms
twisti
parents:
12837
diff
changeset
|
2407 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad invokehandle", empty); |
1c90f0072f0d
8026502: java/lang/invoke/MethodHandleConstants.java fails on all platforms
twisti
parents:
12837
diff
changeset
|
2408 } |
1c90f0072f0d
8026502: java/lang/invoke/MethodHandleConstants.java fails on all platforms
twisti
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12837
diff
changeset
|
2409 |
6266
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|
2410 // call java.lang.invoke.MethodHandleNatives::linkMethod(... String, MethodType) -> MemberName |
1d7922586cf6
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parents:
6217
diff
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|
2411 JavaCallArguments args; |
1d7922586cf6
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parents:
6217
diff
changeset
|
2412 args.push_oop(accessing_klass()->java_mirror()); |
1d7922586cf6
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diff
changeset
|
2413 args.push_int(ref_kind); |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
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diff
changeset
|
2414 args.push_oop(mh_klass()->java_mirror()); |
1d7922586cf6
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6217
diff
changeset
|
2415 args.push_oop(name_str()); |
1d7922586cf6
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6217
diff
changeset
|
2416 args.push_oop(method_type()); |
1d7922586cf6
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diff
changeset
|
2417 args.push_oop(appendix_box()); |
1d7922586cf6
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diff
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|
2418 JavaValue result(T_OBJECT); |
1d7922586cf6
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parents:
6217
diff
changeset
|
2419 JavaCalls::call_static(&result, |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
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6217
diff
changeset
|
2420 SystemDictionary::MethodHandleNatives_klass(), |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2421 vmSymbols::linkMethod_name(), |
1d7922586cf6
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twisti
parents:
6217
diff
changeset
|
2422 vmSymbols::linkMethod_signature(), |
1d7922586cf6
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twisti
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6217
diff
changeset
|
2423 &args, CHECK_(empty)); |
1d7922586cf6
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twisti
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6217
diff
changeset
|
2424 Handle mname(THREAD, (oop) result.get_jobject()); |
6822
f6b0eb4e44cf
7200949: JSR 292: rubybench/bench/time/bench_base64.rb fails with jruby.jar not on boot class path
twisti
parents:
6751
diff
changeset
|
2425 (*method_type_result) = method_type; |
7185
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coleenp
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6983
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changeset
|
2426 return unpack_method_and_appendix(mname, accessing_klass, appendix_box, appendix_result, THREAD); |
710 | 2427 } |
2428 | |
6266
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changeset
|
2429 |
2357
8033953d67ff
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|
2430 // Ask Java code to find or construct a java.lang.invoke.MethodType for the given |
710 | 2431 // signature, as interpreted relative to the given class loader. |
2432 // Because of class loader constraints, all method handle usage must be | |
2433 // consistent with this loader. | |
2177
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diff
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|
2434 Handle SystemDictionary::find_method_handle_type(Symbol* signature, |
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|
2435 KlassHandle accessing_klass, |
1507
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jrose
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|
2436 TRAPS) { |
6266
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|
2437 Handle empty; |
1d7922586cf6
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|
2438 vmIntrinsics::ID null_iid = vmIntrinsics::_none; // distinct from all method handle invoker intrinsics |
1d7922586cf6
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|
2439 unsigned int hash = invoke_method_table()->compute_hash(signature, null_iid); |
1d7922586cf6
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2440 int index = invoke_method_table()->hash_to_index(hash); |
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2441 SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, null_iid); |
6725
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2442 if (spe != NULL && spe->method_type() != NULL) { |
da91efe96a93
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|
2443 assert(java_lang_invoke_MethodType::is_instance(spe->method_type()), ""); |
da91efe96a93
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|
2444 return Handle(THREAD, spe->method_type()); |
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a20be10ad437
made Graal work with the HotSpot compiler queue and compiler threads, enabled by -XX:-UseGraalCompilationQueue
Doug Simon <doug.simon@oracle.com>
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14909
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|
2445 } else if (!THREAD->can_call_java()) { |
6266
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2446 warning("SystemDictionary::find_method_handle_type called from compiler thread"); // FIXME |
1d7922586cf6
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2447 return Handle(); // do not attempt from within compiler, unless it was cached |
1d7922586cf6
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|
2448 } |
1d7922586cf6
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|
2449 |
1508
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jrose
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|
2450 Handle class_loader, protection_domain; |
2ffde6cfe049
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|
2451 bool is_on_bcp = true; // keep this true as long as we can materialize from the boot classloader |
2177
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2001
diff
changeset
|
2452 int npts = ArgumentCount(signature).size(); |
1142 | 2453 objArrayHandle pts = oopFactory::new_objArray(SystemDictionary::Class_klass(), npts, CHECK_(empty)); |
710 | 2454 int arg = 0; |
2455 Handle rt; // the return type from the signature | |
2177
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diff
changeset
|
2456 ResourceMark rm(THREAD); |
3582bf76420e
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|
2457 for (SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
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|
2458 oop mirror = NULL; |
2ffde6cfe049
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|
2459 if (is_on_bcp) { |
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|
2460 // Note: class_loader & protection_domain are both null at this point. |
1508
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jrose
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diff
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|
2461 mirror = ss.as_java_mirror(class_loader, protection_domain, |
2ffde6cfe049
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jrose
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changeset
|
2462 SignatureStream::ReturnNull, CHECK_(empty)); |
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diff
changeset
|
2463 if (mirror == NULL) { |
2ffde6cfe049
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diff
changeset
|
2464 // fall back from BCP to accessing_klass |
2ffde6cfe049
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jrose
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|
2465 if (accessing_klass.not_null()) { |
6725
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coleenp
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|
2466 class_loader = Handle(THREAD, InstanceKlass::cast(accessing_klass())->class_loader()); |
da91efe96a93
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diff
changeset
|
2467 protection_domain = Handle(THREAD, InstanceKlass::cast(accessing_klass())->protection_domain()); |
1508
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changeset
|
2468 } |
2ffde6cfe049
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diff
changeset
|
2469 is_on_bcp = false; |
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diff
changeset
|
2470 } |
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diff
changeset
|
2471 } |
2ffde6cfe049
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changeset
|
2472 if (!is_on_bcp) { |
2ffde6cfe049
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jrose
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1507
diff
changeset
|
2473 // Resolve, throwing a real error if it doesn't work. |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2474 mirror = ss.as_java_mirror(class_loader, protection_domain, |
2ffde6cfe049
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jrose
parents:
1507
diff
changeset
|
2475 SignatureStream::NCDFError, CHECK_(empty)); |
710 | 2476 } |
2477 if (ss.at_return_type()) | |
2478 rt = Handle(THREAD, mirror); | |
2479 else | |
2480 pts->obj_at_put(arg++, mirror); | |
6266
1d7922586cf6
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|
2481 |
1508
2ffde6cfe049
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jrose
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1507
diff
changeset
|
2482 // Check accessibility. |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2483 if (ss.is_object() && accessing_klass.not_null()) { |
6725
da91efe96a93
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coleenp
parents:
6266
diff
changeset
|
2484 Klass* sel_klass = java_lang_Class::as_Klass(mirror); |
6266
1d7922586cf6
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6217
diff
changeset
|
2485 mirror = NULL; // safety |
6725
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coleenp
parents:
6266
diff
changeset
|
2486 // Emulate ConstantPool::verify_constant_pool_resolve. |
6983 | 2487 if (sel_klass->oop_is_objArray()) |
6831
d8ce2825b193
8000213: NPG: Should have renamed arrayKlass and typeArrayKlass
coleenp
parents:
6751
diff
changeset
|
2488 sel_klass = ObjArrayKlass::cast(sel_klass)->bottom_klass(); |
6983 | 2489 if (sel_klass->oop_is_instance()) { |
1508
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2490 KlassHandle sel_kh(THREAD, sel_klass); |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2491 LinkResolver::check_klass_accessability(accessing_klass, sel_kh, CHECK_(empty)); |
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2492 } |
2ffde6cfe049
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jrose
parents:
1507
diff
changeset
|
2493 } |
710 | 2494 } |
2495 assert(arg == npts, ""); | |
2496 | |
2357
8033953d67ff
7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents:
2356
diff
changeset
|
2497 // call java.lang.invoke.MethodHandleNatives::findMethodType(Class rt, Class[] pts) -> MethodType |
710 | 2498 JavaCallArguments args(Handle(THREAD, rt())); |
2499 args.push_oop(pts()); | |
2500 JavaValue result(T_OBJECT); | |
2501 JavaCalls::call_static(&result, | |
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2502 SystemDictionary::MethodHandleNatives_klass(), |
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2503 vmSymbols::findMethodHandleType_name(), |
2460 | 2504 vmSymbols::findMethodHandleType_signature(), |
710 | 2505 &args, CHECK_(empty)); |
1793
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
changeset
|
2506 Handle method_type(THREAD, (oop) result.get_jobject()); |
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
changeset
|
2507 |
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
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6217
diff
changeset
|
2508 if (is_on_bcp) { |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2509 // We can cache this MethodType inside the JVM. |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2510 MutexLocker ml(SystemDictionary_lock, THREAD); |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2511 spe = invoke_method_table()->find_entry(index, hash, signature, null_iid); |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2512 if (spe == NULL) |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2513 spe = invoke_method_table()->add_entry(index, hash, signature, null_iid); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
2514 if (spe->method_type() == NULL) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
2515 spe->set_method_type(method_type()); |
1793
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
changeset
|
2516 } |
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
changeset
|
2517 } |
1508
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2518 |
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2519 // report back to the caller with the MethodType |
1793
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
changeset
|
2520 return method_type; |
710 | 2521 } |
2522 | |
1602 | 2523 // Ask Java code to find or construct a method handle constant. |
2524 Handle SystemDictionary::link_method_handle_constant(KlassHandle caller, | |
2525 int ref_kind, //e.g., JVM_REF_invokeVirtual | |
2526 KlassHandle callee, | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2527 Symbol* name_sym, |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2528 Symbol* signature, |
1602 | 2529 TRAPS) { |
2530 Handle empty; | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2531 Handle name = java_lang_String::create_from_symbol(name_sym, CHECK_(empty)); |
1602 | 2532 Handle type; |
2533 if (signature->utf8_length() > 0 && signature->byte_at(0) == '(') { | |
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2534 type = find_method_handle_type(signature, caller, CHECK_(empty)); |
12970
1c90f0072f0d
8026502: java/lang/invoke/MethodHandleConstants.java fails on all platforms
twisti
parents:
12837
diff
changeset
|
2535 } else if (caller.is_null()) { |
1c90f0072f0d
8026502: java/lang/invoke/MethodHandleConstants.java fails on all platforms
twisti
parents:
12837
diff
changeset
|
2536 // This should not happen. JDK code should take care of that. |
1c90f0072f0d
8026502: java/lang/invoke/MethodHandleConstants.java fails on all platforms
twisti
parents:
12837
diff
changeset
|
2537 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MH constant", empty); |
1602 | 2538 } else { |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2539 ResourceMark rm(THREAD); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2540 SignatureStream ss(signature, false); |
1602 | 2541 if (!ss.is_done()) { |
2542 oop mirror = ss.as_java_mirror(caller->class_loader(), caller->protection_domain(), | |
2543 SignatureStream::NCDFError, CHECK_(empty)); | |
2544 type = Handle(THREAD, mirror); | |
2545 ss.next(); | |
2546 if (!ss.is_done()) type = Handle(); // error! | |
2547 } | |
2548 } | |
2549 if (type.is_null()) { | |
2550 THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad signature", empty); | |
2551 } | |
2552 | |
2357
8033953d67ff
7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents:
2356
diff
changeset
|
2553 // call java.lang.invoke.MethodHandleNatives::linkMethodHandleConstant(Class caller, int refKind, Class callee, String name, Object type) -> MethodHandle |
1602 | 2554 JavaCallArguments args; |
2555 args.push_oop(caller->java_mirror()); // the referring class | |
2556 args.push_int(ref_kind); | |
2557 args.push_oop(callee->java_mirror()); // the target class | |
2558 args.push_oop(name()); | |
2559 args.push_oop(type()); | |
2560 JavaValue result(T_OBJECT); | |
2561 JavaCalls::call_static(&result, | |
2562 SystemDictionary::MethodHandleNatives_klass(), | |
2563 vmSymbols::linkMethodHandleConstant_name(), | |
2460 | 2564 vmSymbols::linkMethodHandleConstant_signature(), |
1602 | 2565 &args, CHECK_(empty)); |
2566 return Handle(THREAD, (oop) result.get_jobject()); | |
2567 } | |
710 | 2568 |
2357
8033953d67ff
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jrose
parents:
2356
diff
changeset
|
2569 // Ask Java code to find or construct a java.lang.invoke.CallSite for the given |
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2570 // name and signature, as interpreted relative to the given class loader. |
6266
1d7922586cf6
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6217
diff
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|
2571 methodHandle SystemDictionary::find_dynamic_call_site_invoker(KlassHandle caller, |
1d7922586cf6
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6217
diff
changeset
|
2572 Handle bootstrap_specifier, |
1d7922586cf6
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6217
diff
changeset
|
2573 Symbol* name, |
1d7922586cf6
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twisti
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6217
diff
changeset
|
2574 Symbol* type, |
6822
f6b0eb4e44cf
7200949: JSR 292: rubybench/bench/time/bench_base64.rb fails with jruby.jar not on boot class path
twisti
parents:
6751
diff
changeset
|
2575 Handle *appendix_result, |
f6b0eb4e44cf
7200949: JSR 292: rubybench/bench/time/bench_base64.rb fails with jruby.jar not on boot class path
twisti
parents:
6751
diff
changeset
|
2576 Handle *method_type_result, |
6266
1d7922586cf6
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parents:
6217
diff
changeset
|
2577 TRAPS) { |
1d7922586cf6
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twisti
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6217
diff
changeset
|
2578 methodHandle empty; |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
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6217
diff
changeset
|
2579 Handle bsm, info; |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
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6217
diff
changeset
|
2580 if (java_lang_invoke_MethodHandle::is_instance(bootstrap_specifier())) { |
1d7922586cf6
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twisti
parents:
6217
diff
changeset
|
2581 bsm = bootstrap_specifier; |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
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6217
diff
changeset
|
2582 } else { |
1d7922586cf6
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twisti
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6217
diff
changeset
|
2583 assert(bootstrap_specifier->is_objArray(), ""); |
1d7922586cf6
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twisti
parents:
6217
diff
changeset
|
2584 objArrayHandle args(THREAD, (objArrayOop) bootstrap_specifier()); |
1d7922586cf6
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twisti
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6217
diff
changeset
|
2585 int len = args->length(); |
1d7922586cf6
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twisti
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6217
diff
changeset
|
2586 assert(len >= 1, ""); |
1d7922586cf6
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6217
diff
changeset
|
2587 bsm = Handle(THREAD, args->obj_at(0)); |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
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6217
diff
changeset
|
2588 if (len > 1) { |
1d7922586cf6
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twisti
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6217
diff
changeset
|
2589 objArrayOop args1 = oopFactory::new_objArray(SystemDictionary::Object_klass(), len-1, CHECK_(empty)); |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
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6217
diff
changeset
|
2590 for (int i = 1; i < len; i++) |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
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6217
diff
changeset
|
2591 args1->obj_at_put(i-1, args->obj_at(i)); |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2592 info = Handle(THREAD, args1); |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2593 } |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
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6217
diff
changeset
|
2594 } |
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2595 guarantee(java_lang_invoke_MethodHandle::is_instance(bsm()), |
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2596 "caller must supply a valid BSM"); |
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2597 |
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2598 Handle method_name = java_lang_String::create_from_symbol(name, CHECK_(empty)); |
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2599 Handle method_type = find_method_handle_type(type, caller, CHECK_(empty)); |
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2600 |
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2601 // This should not happen. JDK code should take care of that. |
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2602 if (caller.is_null() || method_type.is_null()) { |
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2603 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad invokedynamic", empty); |
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2604 } |
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2605 |
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2606 objArrayHandle appendix_box = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1, CHECK_(empty)); |
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2607 assert(appendix_box->obj_at(0) == NULL, ""); |
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2608 |
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2609 // call java.lang.invoke.MethodHandleNatives::linkCallSite(caller, bsm, name, mtype, info, &appendix) |
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2610 JavaCallArguments args; |
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2611 args.push_oop(caller->java_mirror()); |
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2612 args.push_oop(bsm()); |
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2613 args.push_oop(method_name()); |
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2614 args.push_oop(method_type()); |
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2615 args.push_oop(info()); |
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2616 args.push_oop(appendix_box); |
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2617 JavaValue result(T_OBJECT); |
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2618 JavaCalls::call_static(&result, |
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2619 SystemDictionary::MethodHandleNatives_klass(), |
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2620 vmSymbols::linkCallSite_name(), |
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2621 vmSymbols::linkCallSite_signature(), |
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2622 &args, CHECK_(empty)); |
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2623 Handle mname(THREAD, (oop) result.get_jobject()); |
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2624 (*method_type_result) = method_type; |
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2625 return unpack_method_and_appendix(mname, caller, appendix_box, appendix_result, THREAD); |
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2626 } |
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2627 |
0 | 2628 // Since the identity hash code for symbols changes when the symbols are |
2629 // moved from the regular perm gen (hash in the mark word) to the shared | |
2630 // spaces (hash is the address), the classes loaded into the dictionary | |
2631 // may be in the wrong buckets. | |
2632 | |
2633 void SystemDictionary::reorder_dictionary() { | |
2634 dictionary()->reorder_dictionary(); | |
2635 } | |
2636 | |
2637 | |
2638 void SystemDictionary::copy_buckets(char** top, char* end) { | |
2639 dictionary()->copy_buckets(top, end); | |
2640 } | |
2641 | |
2642 | |
2643 void SystemDictionary::copy_table(char** top, char* end) { | |
2644 dictionary()->copy_table(top, end); | |
2645 } | |
2646 | |
2647 | |
2648 void SystemDictionary::reverse() { | |
2649 dictionary()->reverse(); | |
2650 } | |
2651 | |
2652 int SystemDictionary::number_of_classes() { | |
2653 return dictionary()->number_of_entries(); | |
2654 } | |
2655 | |
2656 | |
2657 // ---------------------------------------------------------------------------- | |
2658 #ifndef PRODUCT | |
2659 | |
2660 void SystemDictionary::print() { | |
2661 dictionary()->print(); | |
2662 | |
2663 // Placeholders | |
2664 GCMutexLocker mu(SystemDictionary_lock); | |
2665 placeholders()->print(); | |
2666 | |
2667 // loader constraints - print under SD_lock | |
2668 constraints()->print(); | |
2669 } | |
2670 | |
2671 #endif | |
2672 | |
2673 void SystemDictionary::verify() { | |
2674 guarantee(dictionary() != NULL, "Verify of system dictionary failed"); | |
2675 guarantee(constraints() != NULL, | |
2676 "Verify of loader constraints failed"); | |
2677 guarantee(dictionary()->number_of_entries() >= 0 && | |
2678 placeholders()->number_of_entries() >= 0, | |
2679 "Verify of system dictionary failed"); | |
2680 | |
2681 // Verify dictionary | |
2682 dictionary()->verify(); | |
2683 | |
2684 GCMutexLocker mu(SystemDictionary_lock); | |
2685 placeholders()->verify(); | |
2686 | |
2687 // Verify constraint table | |
2688 guarantee(constraints() != NULL, "Verify of loader constraints failed"); | |
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2689 constraints()->verify(dictionary(), placeholders()); |
0 | 2690 } |
2691 | |
14909 | 2692 |
2693 void SystemDictionary::verify_obj_klass_present(Symbol* class_name, | |
2694 ClassLoaderData* loader_data) { | |
2695 GCMutexLocker mu(SystemDictionary_lock); | |
2696 Symbol* name; | |
2697 | |
2698 Klass* probe = find_class(class_name, loader_data); | |
2699 if (probe == NULL) { | |
2700 probe = SystemDictionary::find_shared_class(class_name); | |
2701 if (probe == NULL) { | |
2702 name = find_placeholder(class_name, loader_data); | |
2703 } | |
2704 } | |
2705 guarantee(probe != NULL || name != NULL, | |
2706 "Loaded klasses should be in SystemDictionary"); | |
2707 } | |
2708 | |
10405 | 2709 // utility function for class load event |
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2710 void SystemDictionary::post_class_load_event(const Ticks& start_time, |
10405 | 2711 instanceKlassHandle k, |
2712 Handle initiating_loader) { | |
2713 #if INCLUDE_TRACE | |
2714 EventClassLoad event(UNTIMED); | |
2715 if (event.should_commit()) { | |
2716 event.set_starttime(start_time); | |
2717 event.set_loadedClass(k()); | |
2718 oop defining_class_loader = k->class_loader(); | |
2719 event.set_definingClassLoader(defining_class_loader != NULL ? | |
2720 defining_class_loader->klass() : (Klass*)NULL); | |
2721 oop class_loader = initiating_loader.is_null() ? (oop)NULL : initiating_loader(); | |
2722 event.set_initiatingClassLoader(class_loader != NULL ? | |
2723 class_loader->klass() : (Klass*)NULL); | |
2724 event.commit(); | |
2725 } | |
2726 #endif /* INCLUDE_TRACE */ | |
2727 } | |
2728 | |
0 | 2729 #ifndef PRODUCT |
2730 | |
2731 // statistics code | |
2732 class ClassStatistics: AllStatic { | |
2733 private: | |
2734 static int nclasses; // number of classes | |
2735 static int nmethods; // number of methods | |
2736 static int nmethoddata; // number of methodData | |
2737 static int class_size; // size of class objects in words | |
2738 static int method_size; // size of method objects in words | |
2739 static int debug_size; // size of debug info in methods | |
2740 static int methoddata_size; // size of methodData objects in words | |
2741 | |
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2742 static void do_class(Klass* k) { |
0 | 2743 nclasses++; |
2744 class_size += k->size(); | |
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2745 if (k->oop_is_instance()) { |
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2746 InstanceKlass* ik = (InstanceKlass*)k; |
0 | 2747 class_size += ik->methods()->size(); |
2748 class_size += ik->constants()->size(); | |
2749 class_size += ik->local_interfaces()->size(); | |
2750 class_size += ik->transitive_interfaces()->size(); | |
2751 // We do not have to count implementors, since we only store one! | |
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2752 // SSS: How should these be accounted now that they have moved? |
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2753 // class_size += ik->fields()->length(); |
0 | 2754 } |
2755 } | |
2756 | |
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2757 static void do_method(Method* m) { |
0 | 2758 nmethods++; |
2759 method_size += m->size(); | |
2760 // class loader uses same objArray for empty vectors, so don't count these | |
2761 if (m->has_stackmap_table()) { | |
2762 method_size += m->stackmap_data()->size(); | |
2763 } | |
2764 | |
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2765 MethodData* mdo = m->method_data(); |
0 | 2766 if (mdo != NULL) { |
2767 nmethoddata++; | |
2768 methoddata_size += mdo->size(); | |
2769 } | |
2770 } | |
2771 | |
2772 public: | |
2773 static void print() { | |
2774 SystemDictionary::classes_do(do_class); | |
2775 SystemDictionary::methods_do(do_method); | |
2776 tty->print_cr("Class statistics:"); | |
2777 tty->print_cr("%d classes (%d bytes)", nclasses, class_size * oopSize); | |
2778 tty->print_cr("%d methods (%d bytes = %d base + %d debug info)", nmethods, | |
2779 (method_size + debug_size) * oopSize, method_size * oopSize, debug_size * oopSize); | |
2780 tty->print_cr("%d methoddata (%d bytes)", nmethoddata, methoddata_size * oopSize); | |
2781 } | |
2782 }; | |
2783 | |
2784 | |
2785 int ClassStatistics::nclasses = 0; | |
2786 int ClassStatistics::nmethods = 0; | |
2787 int ClassStatistics::nmethoddata = 0; | |
2788 int ClassStatistics::class_size = 0; | |
2789 int ClassStatistics::method_size = 0; | |
2790 int ClassStatistics::debug_size = 0; | |
2791 int ClassStatistics::methoddata_size = 0; | |
2792 | |
2793 void SystemDictionary::print_class_statistics() { | |
2794 ResourceMark rm; | |
2795 ClassStatistics::print(); | |
2796 } | |
2797 | |
2798 | |
2799 class MethodStatistics: AllStatic { | |
2800 public: | |
2801 enum { | |
2802 max_parameter_size = 10 | |
2803 }; | |
2804 private: | |
2805 | |
2806 static int _number_of_methods; | |
2807 static int _number_of_final_methods; | |
2808 static int _number_of_static_methods; | |
2809 static int _number_of_native_methods; | |
2810 static int _number_of_synchronized_methods; | |
2811 static int _number_of_profiled_methods; | |
2812 static int _number_of_bytecodes; | |
2813 static int _parameter_size_profile[max_parameter_size]; | |
2814 static int _bytecodes_profile[Bytecodes::number_of_java_codes]; | |
2815 | |
2816 static void initialize() { | |
2817 _number_of_methods = 0; | |
2818 _number_of_final_methods = 0; | |
2819 _number_of_static_methods = 0; | |
2820 _number_of_native_methods = 0; | |
2821 _number_of_synchronized_methods = 0; | |
2822 _number_of_profiled_methods = 0; | |
2823 _number_of_bytecodes = 0; | |
2824 for (int i = 0; i < max_parameter_size ; i++) _parameter_size_profile[i] = 0; | |
2825 for (int j = 0; j < Bytecodes::number_of_java_codes; j++) _bytecodes_profile [j] = 0; | |
2826 }; | |
2827 | |
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2828 static void do_method(Method* m) { |
0 | 2829 _number_of_methods++; |
2830 // collect flag info | |
2831 if (m->is_final() ) _number_of_final_methods++; | |
2832 if (m->is_static() ) _number_of_static_methods++; | |
2833 if (m->is_native() ) _number_of_native_methods++; | |
2834 if (m->is_synchronized()) _number_of_synchronized_methods++; | |
2835 if (m->method_data() != NULL) _number_of_profiled_methods++; | |
2836 // collect parameter size info (add one for receiver, if any) | |
2837 _parameter_size_profile[MIN2(m->size_of_parameters() + (m->is_static() ? 0 : 1), max_parameter_size - 1)]++; | |
2838 // collect bytecodes info | |
2839 { | |
2840 Thread *thread = Thread::current(); | |
2841 HandleMark hm(thread); | |
2842 BytecodeStream s(methodHandle(thread, m)); | |
2843 Bytecodes::Code c; | |
2844 while ((c = s.next()) >= 0) { | |
2845 _number_of_bytecodes++; | |
2846 _bytecodes_profile[c]++; | |
2847 } | |
2848 } | |
2849 } | |
2850 | |
2851 public: | |
2852 static void print() { | |
2853 initialize(); | |
2854 SystemDictionary::methods_do(do_method); | |
2855 // generate output | |
2856 tty->cr(); | |
2857 tty->print_cr("Method statistics (static):"); | |
2858 // flag distribution | |
2859 tty->cr(); | |
2860 tty->print_cr("%6d final methods %6.1f%%", _number_of_final_methods , _number_of_final_methods * 100.0F / _number_of_methods); | |
2861 tty->print_cr("%6d static methods %6.1f%%", _number_of_static_methods , _number_of_static_methods * 100.0F / _number_of_methods); | |
2862 tty->print_cr("%6d native methods %6.1f%%", _number_of_native_methods , _number_of_native_methods * 100.0F / _number_of_methods); | |
2863 tty->print_cr("%6d synchronized methods %6.1f%%", _number_of_synchronized_methods, _number_of_synchronized_methods * 100.0F / _number_of_methods); | |
2864 tty->print_cr("%6d profiled methods %6.1f%%", _number_of_profiled_methods, _number_of_profiled_methods * 100.0F / _number_of_methods); | |
2865 // parameter size profile | |
2866 tty->cr(); | |
2867 { int tot = 0; | |
2868 int avg = 0; | |
2869 for (int i = 0; i < max_parameter_size; i++) { | |
2870 int n = _parameter_size_profile[i]; | |
2871 tot += n; | |
2872 avg += n*i; | |
2873 tty->print_cr("parameter size = %1d: %6d methods %5.1f%%", i, n, n * 100.0F / _number_of_methods); | |
2874 } | |
2875 assert(tot == _number_of_methods, "should be the same"); | |
2876 tty->print_cr(" %6d methods 100.0%%", _number_of_methods); | |
2877 tty->print_cr("(average parameter size = %3.1f including receiver, if any)", (float)avg / _number_of_methods); | |
2878 } | |
2879 // bytecodes profile | |
2880 tty->cr(); | |
2881 { int tot = 0; | |
2882 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) { | |
2883 if (Bytecodes::is_defined(i)) { | |
2884 Bytecodes::Code c = Bytecodes::cast(i); | |
2885 int n = _bytecodes_profile[c]; | |
2886 tot += n; | |
2887 tty->print_cr("%9d %7.3f%% %s", n, n * 100.0F / _number_of_bytecodes, Bytecodes::name(c)); | |
2888 } | |
2889 } | |
2890 assert(tot == _number_of_bytecodes, "should be the same"); | |
2891 tty->print_cr("%9d 100.000%%", _number_of_bytecodes); | |
2892 } | |
2893 tty->cr(); | |
2894 } | |
2895 }; | |
2896 | |
2897 int MethodStatistics::_number_of_methods; | |
2898 int MethodStatistics::_number_of_final_methods; | |
2899 int MethodStatistics::_number_of_static_methods; | |
2900 int MethodStatistics::_number_of_native_methods; | |
2901 int MethodStatistics::_number_of_synchronized_methods; | |
2902 int MethodStatistics::_number_of_profiled_methods; | |
2903 int MethodStatistics::_number_of_bytecodes; | |
2904 int MethodStatistics::_parameter_size_profile[MethodStatistics::max_parameter_size]; | |
2905 int MethodStatistics::_bytecodes_profile[Bytecodes::number_of_java_codes]; | |
2906 | |
2907 | |
2908 void SystemDictionary::print_method_statistics() { | |
2909 MethodStatistics::print(); | |
2910 } | |
2911 | |
2912 #endif // PRODUCT |