Mercurial > hg > truffle
annotate src/share/vm/classfile/systemDictionary.cpp @ 18176:c2270ad35f57
Better construction of data section and data patches.
author | Roland Schatz <roland.schatz@oracle.com> |
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date | Mon, 27 Oct 2014 14:07:49 +0100 |
parents | 52b4284cb496 |
children | 43e2cc9a4fde |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2014, 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 (load_instance_added == true) { |
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841 // clean up placeholder entries for LOAD_INSTANCE success or error |
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842 // This brackets the SystemDictionary updates for both defining |
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843 // and initiating loaders |
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844 MutexLocker mu(SystemDictionary_lock, THREAD); |
10405 | 845 placeholders()->find_and_remove(p_index, p_hash, name, loader_data, PlaceholderTable::LOAD_INSTANCE, THREAD); |
846 SystemDictionary_lock->notify_all(); | |
0 | 847 } |
848 } | |
849 | |
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850 if (HAS_PENDING_EXCEPTION || k.is_null()) { |
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851 return NULL; |
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852 } |
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853 |
10405 | 854 post_class_load_event(class_load_start_time, k, class_loader); |
855 | |
0 | 856 #ifdef ASSERT |
857 { | |
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858 ClassLoaderData* loader_data = k->class_loader_data(); |
0 | 859 MutexLocker mu(SystemDictionary_lock, THREAD); |
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860 Klass* kk = find_class(name, loader_data); |
0 | 861 assert(kk == k(), "should be present in dictionary"); |
862 } | |
863 #endif | |
864 | |
865 // return if the protection domain in NULL | |
866 if (protection_domain() == NULL) return k(); | |
867 | |
868 // Check the protection domain has the right access | |
869 { | |
870 MutexLocker mu(SystemDictionary_lock, THREAD); | |
871 // Note that we have an entry, and entries can be deleted only during GC, | |
872 // so we cannot allow GC to occur while we're holding this entry. | |
873 // We're using a No_Safepoint_Verifier to catch any place where we | |
874 // might potentially do a GC at all. | |
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875 // Dictionary::do_unloading() asserts that classes in SD are only |
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876 // unloaded at a safepoint. Anonymous classes are not in SD. |
0 | 877 No_Safepoint_Verifier nosafepoint; |
878 if (dictionary()->is_valid_protection_domain(d_index, d_hash, name, | |
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879 loader_data, |
0 | 880 protection_domain)) { |
881 return k(); | |
882 } | |
883 } | |
884 | |
885 // Verify protection domain. If it fails an exception is thrown | |
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886 validate_protection_domain(k, class_loader, protection_domain, CHECK_NULL); |
0 | 887 |
888 return k(); | |
889 } | |
890 | |
891 | |
892 // This routine does not lock the system dictionary. | |
893 // | |
894 // Since readers don't hold a lock, we must make sure that system | |
895 // dictionary entries are only removed at a safepoint (when only one | |
896 // thread is running), and are added to in a safe way (all links must | |
897 // be updated in an MT-safe manner). | |
898 // | |
899 // Callers should be aware that an entry could be added just after | |
900 // _dictionary->bucket(index) is read here, so the caller will not see | |
901 // the new entry. | |
902 | |
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903 Klass* SystemDictionary::find(Symbol* class_name, |
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904 Handle class_loader, |
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905 Handle protection_domain, |
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906 TRAPS) { |
0 | 907 |
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908 // UseNewReflection |
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909 // The result of this call should be consistent with the result |
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910 // of the call to resolve_instance_class_or_null(). |
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911 // See evaluation 6790209 and 4474172 for more details. |
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912 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); |
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913 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data_or_null(class_loader()); |
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914 |
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915 if (loader_data == NULL) { |
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916 // If the ClassLoaderData has not been setup, |
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917 // then the class loader has no entries in the dictionary. |
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918 return NULL; |
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919 } |
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920 |
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921 unsigned int d_hash = dictionary()->compute_hash(class_name, loader_data); |
0 | 922 int d_index = dictionary()->hash_to_index(d_hash); |
923 | |
924 { | |
925 // Note that we have an entry, and entries can be deleted only during GC, | |
926 // so we cannot allow GC to occur while we're holding this entry. | |
927 // We're using a No_Safepoint_Verifier to catch any place where we | |
928 // might potentially do a GC at all. | |
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929 // Dictionary::do_unloading() asserts that classes in SD are only |
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930 // unloaded at a safepoint. Anonymous classes are not in SD. |
0 | 931 No_Safepoint_Verifier nosafepoint; |
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932 return dictionary()->find(d_index, d_hash, class_name, loader_data, |
0 | 933 protection_domain, THREAD); |
934 } | |
935 } | |
936 | |
937 | |
938 // Look for a loaded instance or array klass by name. Do not do any loading. | |
939 // return NULL in case of error. | |
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940 Klass* SystemDictionary::find_instance_or_array_klass(Symbol* class_name, |
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941 Handle class_loader, |
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942 Handle protection_domain, |
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943 TRAPS) { |
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944 Klass* k = NULL; |
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945 assert(class_name != NULL, "class name must be non NULL"); |
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946 |
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947 if (FieldType::is_array(class_name)) { |
0 | 948 // The name refers to an array. Parse the name. |
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949 // dimension and object_key in FieldArrayInfo are assigned as a |
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950 // side-effect of this call |
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951 FieldArrayInfo fd; |
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952 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
0 | 953 if (t != T_OBJECT) { |
954 k = Universe::typeArrayKlassObj(t); | |
955 } else { | |
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956 k = SystemDictionary::find(fd.object_key(), class_loader, protection_domain, THREAD); |
0 | 957 } |
958 if (k != NULL) { | |
6983 | 959 k = k->array_klass_or_null(fd.dimension()); |
0 | 960 } |
961 } else { | |
962 k = find(class_name, class_loader, protection_domain, THREAD); | |
963 } | |
964 return k; | |
965 } | |
966 | |
967 // Note: this method is much like resolve_from_stream, but | |
968 // updates no supplemental data structures. | |
969 // TODO consolidate the two methods with a helper routine? | |
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970 Klass* SystemDictionary::parse_stream(Symbol* class_name, |
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971 Handle class_loader, |
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972 Handle protection_domain, |
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973 ClassFileStream* st, |
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974 KlassHandle host_klass, |
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975 GrowableArray<Handle>* cp_patches, |
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976 TRAPS) { |
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977 TempNewSymbol parsed_name = NULL; |
0 | 978 |
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979 Ticks class_load_start_time = Ticks::now(); |
10405 | 980 |
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981 ClassLoaderData* loader_data; |
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982 if (host_klass.not_null()) { |
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983 // Create a new CLD for anonymous class, that uses the same class loader |
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984 // as the host_klass |
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985 assert(EnableInvokeDynamic, ""); |
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986 guarantee(host_klass->class_loader() == class_loader(), "should be the same"); |
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987 loader_data = ClassLoaderData::anonymous_class_loader_data(class_loader(), CHECK_NULL); |
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988 loader_data->record_dependency(host_klass(), CHECK_NULL); |
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989 } else { |
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990 loader_data = ClassLoaderData::class_loader_data(class_loader()); |
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991 } |
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992 |
0 | 993 // Parse the stream. Note that we do this even though this klass might |
994 // already be present in the SystemDictionary, otherwise we would not | |
995 // throw potential ClassFormatErrors. | |
996 // | |
997 // Note: "name" is updated. | |
998 | |
999 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
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1000 loader_data, |
0 | 1001 protection_domain, |
710 | 1002 host_klass, |
1003 cp_patches, | |
0 | 1004 parsed_name, |
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1005 true, |
0 | 1006 THREAD); |
1007 | |
1008 | |
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1009 if (host_klass.not_null() && k.not_null()) { |
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1010 assert(EnableInvokeDynamic, ""); |
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1011 // If it's anonymous, initialize it now, since nobody else will. |
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1012 |
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1013 { |
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1014 MutexLocker mu_r(Compile_lock, THREAD); |
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1015 |
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1016 // Add to class hierarchy, initialize vtables, and do possible |
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1017 // deoptimizations. |
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1018 add_to_hierarchy(k, CHECK_NULL); // No exception, but can block |
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1019 |
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1020 // But, do not add to system dictionary. |
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1021 |
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1022 // compiled code dependencies need to be validated anyway |
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1023 notice_modification(); |
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1024 } |
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1025 |
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1026 // Rewrite and patch constant pool here. |
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1027 k->link_class(CHECK_NULL); |
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1028 if (cp_patches != NULL) { |
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1029 k->constants()->patch_resolved_references(cp_patches); |
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1030 } |
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1031 k->eager_initialize(CHECK_NULL); |
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1032 |
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1033 // notify jvmti |
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1034 if (JvmtiExport::should_post_class_load()) { |
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1035 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); |
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1036 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); |
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1037 } |
10405 | 1038 |
1039 post_class_load_event(class_load_start_time, k, class_loader); | |
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1040 } |
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1041 assert(host_klass.not_null() || cp_patches == NULL, |
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1042 "cp_patches only found with host_klass"); |
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1043 |
0 | 1044 return k(); |
1045 } | |
1046 | |
1047 // Add a klass to the system from a stream (called by jni_DefineClass and | |
1048 // JVM_DefineClass). | |
1049 // Note: class_name can be NULL. In that case we do not know the name of | |
1050 // the class until we have parsed the stream. | |
1051 | |
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1052 Klass* SystemDictionary::resolve_from_stream(Symbol* class_name, |
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1053 Handle class_loader, |
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1054 Handle protection_domain, |
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1055 ClassFileStream* st, |
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1056 bool verify, |
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1057 TRAPS) { |
0 | 1058 |
514 | 1059 // Classloaders that support parallelism, e.g. bootstrap classloader, |
1060 // or all classloaders with UnsyncloadClass do not acquire lock here | |
1061 bool DoObjectLock = true; | |
1062 if (is_parallelCapable(class_loader)) { | |
1063 DoObjectLock = false; | |
1064 } | |
1065 | |
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1066 ClassLoaderData* loader_data = register_loader(class_loader, CHECK_NULL); |
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1067 |
514 | 1068 // Make sure we are synchronized on the class loader before we proceed |
0 | 1069 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); |
1070 check_loader_lock_contention(lockObject, THREAD); | |
514 | 1071 ObjectLocker ol(lockObject, THREAD, DoObjectLock); |
0 | 1072 |
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1073 TempNewSymbol parsed_name = NULL; |
0 | 1074 |
1075 // Parse the stream. Note that we do this even though this klass might | |
1076 // already be present in the SystemDictionary, otherwise we would not | |
1077 // throw potential ClassFormatErrors. | |
1078 // | |
1079 // Note: "name" is updated. | |
1080 | |
1081 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
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1082 loader_data, |
0 | 1083 protection_domain, |
1084 parsed_name, | |
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1085 verify, |
0 | 1086 THREAD); |
1087 | |
1088 const char* pkg = "java/"; | |
1089 if (!HAS_PENDING_EXCEPTION && | |
1090 !class_loader.is_null() && | |
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1091 parsed_name != NULL && |
0 | 1092 !strncmp((const char*)parsed_name->bytes(), pkg, strlen(pkg))) { |
1093 // It is illegal to define classes in the "java." package from | |
1094 // JVM_DefineClass or jni_DefineClass unless you're the bootclassloader | |
1095 ResourceMark rm(THREAD); | |
1096 char* name = parsed_name->as_C_string(); | |
1097 char* index = strrchr(name, '/'); | |
1098 *index = '\0'; // chop to just the package name | |
1099 while ((index = strchr(name, '/')) != NULL) { | |
1100 *index = '.'; // replace '/' with '.' in package name | |
1101 } | |
1102 const char* fmt = "Prohibited package name: %s"; | |
1103 size_t len = strlen(fmt) + strlen(name); | |
1104 char* message = NEW_RESOURCE_ARRAY(char, len); | |
1105 jio_snprintf(message, len, fmt, name); | |
1106 Exceptions::_throw_msg(THREAD_AND_LOCATION, | |
1107 vmSymbols::java_lang_SecurityException(), message); | |
1108 } | |
1109 | |
1110 if (!HAS_PENDING_EXCEPTION) { | |
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1111 assert(parsed_name != NULL, "Sanity"); |
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1112 assert(class_name == NULL || class_name == parsed_name, "name mismatch"); |
0 | 1113 // Verification prevents us from creating names with dots in them, this |
1114 // asserts that that's the case. | |
1115 assert(is_internal_format(parsed_name), | |
1116 "external class name format used internally"); | |
1117 | |
1118 // Add class just loaded | |
514 | 1119 // If a class loader supports parallel classloading handle parallel define requests |
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1120 // find_or_define_instance_class may return a different InstanceKlass |
514 | 1121 if (is_parallelCapable(class_loader)) { |
1122 k = find_or_define_instance_class(class_name, class_loader, k, THREAD); | |
1123 } else { | |
1124 define_instance_class(k, THREAD); | |
1125 } | |
0 | 1126 } |
1127 | |
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1128 // Make sure we have an entry in the SystemDictionary on success |
0 | 1129 debug_only( { |
1130 if (!HAS_PENDING_EXCEPTION) { | |
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1131 assert(parsed_name != NULL, "parsed_name is still null?"); |
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1132 Symbol* h_name = k->name(); |
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1133 ClassLoaderData *defining_loader_data = k->class_loader_data(); |
0 | 1134 |
1135 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1136 | |
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1137 Klass* check = find_class(parsed_name, loader_data); |
0 | 1138 assert(check == k(), "should be present in the dictionary"); |
1139 | |
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1140 Klass* check2 = find_class(h_name, defining_loader_data); |
0 | 1141 assert(check == check2, "name inconsistancy in SystemDictionary"); |
1142 } | |
1143 } ); | |
1144 | |
1145 return k(); | |
1146 } | |
1147 | |
1148 | |
6197 | 1149 void SystemDictionary::set_shared_dictionary(HashtableBucket<mtClass>* t, int length, |
0 | 1150 int number_of_entries) { |
6197 | 1151 assert(length == _nof_buckets * sizeof(HashtableBucket<mtClass>), |
0 | 1152 "bad shared dictionary size."); |
1153 _shared_dictionary = new Dictionary(_nof_buckets, t, number_of_entries); | |
1154 } | |
1155 | |
1156 | |
1157 // If there is a shared dictionary, then find the entry for the | |
1158 // given shared system class, if any. | |
1159 | |
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1160 Klass* SystemDictionary::find_shared_class(Symbol* class_name) { |
0 | 1161 if (shared_dictionary() != NULL) { |
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1162 unsigned int d_hash = shared_dictionary()->compute_hash(class_name, NULL); |
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1163 int d_index = shared_dictionary()->hash_to_index(d_hash); |
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1164 |
0 | 1165 return shared_dictionary()->find_shared_class(d_index, d_hash, class_name); |
1166 } else { | |
1167 return NULL; | |
1168 } | |
1169 } | |
1170 | |
1171 | |
1172 // Load a class from the shared spaces (found through the shared system | |
1173 // dictionary). Force the superclass and all interfaces to be loaded. | |
1174 // Update the class definition to include sibling classes and no | |
1175 // subclasses (yet). [Classes in the shared space are not part of the | |
1176 // object hierarchy until loaded.] | |
1177 | |
1178 instanceKlassHandle SystemDictionary::load_shared_class( | |
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1179 Symbol* class_name, Handle class_loader, TRAPS) { |
0 | 1180 instanceKlassHandle ik (THREAD, find_shared_class(class_name)); |
1181 return load_shared_class(ik, class_loader, THREAD); | |
1182 } | |
1183 | |
1184 instanceKlassHandle SystemDictionary::load_shared_class( | |
1185 instanceKlassHandle ik, Handle class_loader, TRAPS) { | |
1186 assert(class_loader.is_null(), "non-null classloader for shared class?"); | |
1187 if (ik.not_null()) { | |
1188 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1189 Symbol* class_name = ik->name(); |
0 | 1190 |
1191 // Found the class, now load the superclass and interfaces. If they | |
1192 // are shared, add them to the main system dictionary and reset | |
1193 // their hierarchy references (supers, subs, and interfaces). | |
1194 | |
1195 if (ik->super() != NULL) { | |
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1196 Symbol* cn = ik->super()->name(); |
0 | 1197 resolve_super_or_fail(class_name, cn, |
1198 class_loader, Handle(), true, CHECK_(nh)); | |
1199 } | |
1200 | |
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1201 Array<Klass*>* interfaces = ik->local_interfaces(); |
0 | 1202 int num_interfaces = interfaces->length(); |
1203 for (int index = 0; index < num_interfaces; index++) { | |
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1204 Klass* k = interfaces->at(index); |
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1205 |
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1206 // Note: can not use InstanceKlass::cast here because |
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1207 // interfaces' InstanceKlass's C++ vtbls haven't been |
0 | 1208 // reinitialized yet (they will be once the interface classes |
1209 // are loaded) | |
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1210 Symbol* name = k->name(); |
0 | 1211 resolve_super_or_fail(class_name, name, class_loader, Handle(), false, CHECK_(nh)); |
1212 } | |
1213 | |
1214 // Adjust methods to recover missing data. They need addresses for | |
1215 // interpreter entry points and their default native method address | |
1216 // must be reset. | |
1217 | |
1218 // Updating methods must be done under a lock so multiple | |
1219 // threads don't update these in parallel | |
1220 // Shared classes are all currently loaded by the bootstrap | |
1221 // classloader, so this will never cause a deadlock on | |
1222 // a custom class loader lock. | |
1223 | |
1224 { | |
1225 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
1226 check_loader_lock_contention(lockObject, THREAD); | |
1227 ObjectLocker ol(lockObject, THREAD, true); | |
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1228 ik->restore_unshareable_info(CHECK_(nh)); |
0 | 1229 } |
1230 | |
1231 if (TraceClassLoading) { | |
1232 ResourceMark rm; | |
1233 tty->print("[Loaded %s", ik->external_name()); | |
1234 tty->print(" from shared objects file"); | |
1235 tty->print_cr("]"); | |
1236 } | |
1237 // notify a class loaded from shared object | |
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1238 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(ik()), |
0 | 1239 true /* shared class */); |
1240 } | |
1241 return ik; | |
1242 } | |
1243 | |
1244 | |
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1245 instanceKlassHandle SystemDictionary::load_instance_class(Symbol* class_name, Handle class_loader, TRAPS) { |
0 | 1246 instanceKlassHandle nh = instanceKlassHandle(); // null Handle |
1247 if (class_loader.is_null()) { | |
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1248 |
0 | 1249 // Search the shared system dictionary for classes preloaded into the |
1250 // shared spaces. | |
1251 instanceKlassHandle k; | |
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1252 { |
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1253 PerfTraceTime vmtimer(ClassLoader::perf_shared_classload_time()); |
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1254 k = load_shared_class(class_name, class_loader, THREAD); |
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1255 } |
0 | 1256 |
1257 if (k.is_null()) { | |
1258 // Use VM class loader | |
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1259 PerfTraceTime vmtimer(ClassLoader::perf_sys_classload_time()); |
0 | 1260 k = ClassLoader::load_classfile(class_name, CHECK_(nh)); |
1261 } | |
1262 | |
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1263 // find_or_define_instance_class may return a different InstanceKlass |
0 | 1264 if (!k.is_null()) { |
1265 k = find_or_define_instance_class(class_name, class_loader, k, CHECK_(nh)); | |
1266 } | |
1267 return k; | |
1268 } else { | |
1269 // Use user specified class loader to load class. Call loadClass operation on class_loader. | |
1270 ResourceMark rm(THREAD); | |
1271 | |
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1272 assert(THREAD->is_Java_thread(), "must be a JavaThread"); |
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1273 JavaThread* jt = (JavaThread*) THREAD; |
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1274 |
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1275 PerfClassTraceTime vmtimer(ClassLoader::perf_app_classload_time(), |
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1276 ClassLoader::perf_app_classload_selftime(), |
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1277 ClassLoader::perf_app_classload_count(), |
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1278 jt->get_thread_stat()->perf_recursion_counts_addr(), |
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1279 jt->get_thread_stat()->perf_timers_addr(), |
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1280 PerfClassTraceTime::CLASS_LOAD); |
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1281 |
0 | 1282 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nh)); |
1283 // Translate to external class name format, i.e., convert '/' chars to '.' | |
1284 Handle string = java_lang_String::externalize_classname(s, CHECK_(nh)); | |
1285 | |
1286 JavaValue result(T_OBJECT); | |
1287 | |
1142 | 1288 KlassHandle spec_klass (THREAD, SystemDictionary::ClassLoader_klass()); |
0 | 1289 |
514 | 1290 // Call public unsynchronized loadClass(String) directly for all class loaders |
1291 // for parallelCapable class loaders. JDK >=7, loadClass(String, boolean) will | |
1292 // acquire a class-name based lock rather than the class loader object lock. | |
1293 // JDK < 7 already acquire the class loader lock in loadClass(String, boolean), | |
1294 // so the call to loadClassInternal() was not required. | |
1295 // | |
1296 // UnsyncloadClass flag means both call loadClass(String) and do | |
1297 // not acquire the class loader lock even for class loaders that are | |
1298 // not parallelCapable. This was a risky transitional | |
1299 // flag for diagnostic purposes only. It is risky to call | |
0 | 1300 // custom class loaders without synchronization. |
1301 // WARNING If a custom class loader does NOT synchronizer findClass, or callers of | |
514 | 1302 // findClass, the UnsyncloadClass flag risks unexpected timing bugs in the field. |
0 | 1303 // Do NOT assume this will be supported in future releases. |
514 | 1304 // |
1305 // Added MustCallLoadClassInternal in case we discover in the field | |
1306 // a customer that counts on this call | |
1307 if (MustCallLoadClassInternal && has_loadClassInternal()) { | |
0 | 1308 JavaCalls::call_special(&result, |
1309 class_loader, | |
1310 spec_klass, | |
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1311 vmSymbols::loadClassInternal_name(), |
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1312 vmSymbols::string_class_signature(), |
0 | 1313 string, |
1314 CHECK_(nh)); | |
1315 } else { | |
1316 JavaCalls::call_virtual(&result, | |
1317 class_loader, | |
1318 spec_klass, | |
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1319 vmSymbols::loadClass_name(), |
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1320 vmSymbols::string_class_signature(), |
0 | 1321 string, |
1322 CHECK_(nh)); | |
1323 } | |
1324 | |
1325 assert(result.get_type() == T_OBJECT, "just checking"); | |
1326 oop obj = (oop) result.get_jobject(); | |
1327 | |
1328 // Primitive classes return null since forName() can not be | |
1329 // used to obtain any of the Class objects representing primitives or void | |
1330 if ((obj != NULL) && !(java_lang_Class::is_primitive(obj))) { | |
1331 instanceKlassHandle k = | |
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1332 instanceKlassHandle(THREAD, java_lang_Class::as_Klass(obj)); |
0 | 1333 // For user defined Java class loaders, check that the name returned is |
1334 // the same as that requested. This check is done for the bootstrap | |
1335 // loader when parsing the class file. | |
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1336 if (class_name == k->name()) { |
0 | 1337 return k; |
1338 } | |
1339 } | |
1340 // Class is not found or has the wrong name, return NULL | |
1341 return nh; | |
1342 } | |
1343 } | |
1344 | |
1345 void SystemDictionary::define_instance_class(instanceKlassHandle k, TRAPS) { | |
1346 | |
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1347 ClassLoaderData* loader_data = k->class_loader_data(); |
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1348 Handle class_loader_h(THREAD, loader_data->class_loader()); |
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1349 |
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1350 for (uintx it = 0; it < GCExpandToAllocateDelayMillis; it++){} |
0 | 1351 |
514 | 1352 // for bootstrap and other parallel classloaders don't acquire lock, |
1353 // use placeholder token | |
1354 // If a parallelCapable class loader calls define_instance_class instead of | |
1355 // find_or_define_instance_class to get here, we have a timing | |
1356 // hole with systemDictionary updates and check_constraints | |
1357 if (!class_loader_h.is_null() && !is_parallelCapable(class_loader_h)) { | |
0 | 1358 assert(ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, |
1359 compute_loader_lock_object(class_loader_h, THREAD)), | |
1360 "define called without lock"); | |
1361 } | |
1362 | |
1363 // Check class-loading constraints. Throw exception if violation is detected. | |
1364 // Grabs and releases SystemDictionary_lock | |
1365 // The check_constraints/find_class call and update_dictionary sequence | |
1366 // must be "atomic" for a specific class/classloader pair so we never | |
1367 // define two different instanceKlasses for that class/classloader pair. | |
1368 // Existing classloaders will call define_instance_class with the | |
1369 // classloader lock held | |
1370 // Parallel classloaders will call find_or_define_instance_class | |
1371 // which will require a token to perform the define class | |
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1372 Symbol* name_h = k->name(); |
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1373 unsigned int d_hash = dictionary()->compute_hash(name_h, loader_data); |
0 | 1374 int d_index = dictionary()->hash_to_index(d_hash); |
1375 check_constraints(d_index, d_hash, k, class_loader_h, true, CHECK); | |
1376 | |
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1377 // Register class just loaded with class loader (placed in Vector) |
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1378 // Note we do this before updating the dictionary, as this can |
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1379 // fail with an OutOfMemoryError (if it does, we will *not* put this |
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1380 // class in the dictionary and will not update the class hierarchy). |
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1381 // JVMTI FollowReferences needs to find the classes this way. |
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1382 if (k->class_loader() != NULL) { |
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1383 methodHandle m(THREAD, Universe::loader_addClass_method()); |
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1384 JavaValue result(T_VOID); |
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1385 JavaCallArguments args(class_loader_h); |
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1386 args.push_oop(Handle(THREAD, k->java_mirror())); |
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1387 JavaCalls::call(&result, m, &args, CHECK); |
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1388 } |
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1389 |
0 | 1390 // Add the new class. We need recompile lock during update of CHA. |
1391 { | |
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1392 unsigned int p_hash = placeholders()->compute_hash(name_h, loader_data); |
0 | 1393 int p_index = placeholders()->hash_to_index(p_hash); |
1394 | |
1395 MutexLocker mu_r(Compile_lock, THREAD); | |
1396 | |
1397 // Add to class hierarchy, initialize vtables, and do possible | |
1398 // deoptimizations. | |
1399 add_to_hierarchy(k, CHECK); // No exception, but can block | |
1400 | |
1401 // Add to systemDictionary - so other classes can see it. | |
1402 // Grabs and releases SystemDictionary_lock | |
1403 update_dictionary(d_index, d_hash, p_index, p_hash, | |
1404 k, class_loader_h, THREAD); | |
1405 } | |
1406 k->eager_initialize(THREAD); | |
1407 | |
1408 // notify jvmti | |
1409 if (JvmtiExport::should_post_class_load()) { | |
1410 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); | |
1411 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); | |
1412 | |
1413 } | |
10405 | 1414 |
0 | 1415 } |
1416 | |
1417 // Support parallel classloading | |
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1418 // All parallel class loaders, including bootstrap classloader |
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1419 // lock a placeholder entry for this class/class_loader pair |
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1420 // to allow parallel defines of different classes for this class loader |
514 | 1421 // With AllowParallelDefine flag==true, in case they do not synchronize around |
1422 // FindLoadedClass/DefineClass, calls, we check for parallel | |
0 | 1423 // loading for them, wait if a defineClass is in progress |
1424 // and return the initial requestor's results | |
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1425 // This flag does not apply to the bootstrap classloader. |
514 | 1426 // With AllowParallelDefine flag==false, call through to define_instance_class |
1427 // which will throw LinkageError: duplicate class definition. | |
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1428 // False is the requested default. |
0 | 1429 // For better performance, the class loaders should synchronize |
514 | 1430 // findClass(), i.e. FindLoadedClass/DefineClassIfAbsent or they |
0 | 1431 // potentially waste time reading and parsing the bytestream. |
1432 // Note: VM callers should ensure consistency of k/class_name,class_loader | |
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1433 instanceKlassHandle SystemDictionary::find_or_define_instance_class(Symbol* class_name, Handle class_loader, instanceKlassHandle k, TRAPS) { |
0 | 1434 |
1435 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1436 Symbol* name_h = k->name(); // passed in class_name may be null |
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1437 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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1438 |
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1439 unsigned int d_hash = dictionary()->compute_hash(name_h, loader_data); |
0 | 1440 int d_index = dictionary()->hash_to_index(d_hash); |
1441 | |
1442 // Hold SD lock around find_class and placeholder creation for DEFINE_CLASS | |
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1443 unsigned int p_hash = placeholders()->compute_hash(name_h, loader_data); |
0 | 1444 int p_index = placeholders()->hash_to_index(p_hash); |
1445 PlaceholderEntry* probe; | |
1446 | |
1447 { | |
1448 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1449 // First check if class already defined | |
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1450 if (UnsyncloadClass || (is_parallelDefine(class_loader))) { |
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1451 Klass* check = find_class(d_index, d_hash, name_h, loader_data); |
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1452 if (check != NULL) { |
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1453 return(instanceKlassHandle(THREAD, check)); |
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1454 } |
0 | 1455 } |
1456 | |
1457 // Acquire define token for this class/classloader | |
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1458 probe = placeholders()->find_and_add(p_index, p_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, NULL, THREAD); |
514 | 1459 // Wait if another thread defining in parallel |
1460 // All threads wait - even those that will throw duplicate class: otherwise | |
1461 // caller is surprised by LinkageError: duplicate, but findLoadedClass fails | |
1462 // if other thread has not finished updating dictionary | |
1463 while (probe->definer() != NULL) { | |
1464 SystemDictionary_lock->wait(); | |
1465 } | |
1466 // Only special cases allow parallel defines and can use other thread's results | |
1467 // Other cases fall through, and may run into duplicate defines | |
1468 // caught by finding an entry in the SystemDictionary | |
6983 | 1469 if ((UnsyncloadClass || is_parallelDefine(class_loader)) && (probe->instance_klass() != NULL)) { |
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1470 placeholders()->find_and_remove(p_index, p_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, THREAD); |
514 | 1471 SystemDictionary_lock->notify_all(); |
0 | 1472 #ifdef ASSERT |
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1473 Klass* check = find_class(d_index, d_hash, name_h, loader_data); |
514 | 1474 assert(check != NULL, "definer missed recording success"); |
0 | 1475 #endif |
6983 | 1476 return(instanceKlassHandle(THREAD, probe->instance_klass())); |
0 | 1477 } else { |
514 | 1478 // This thread will define the class (even if earlier thread tried and had an error) |
1479 probe->set_definer(THREAD); | |
0 | 1480 } |
1481 } | |
1482 | |
1483 define_instance_class(k, THREAD); | |
1484 | |
1485 Handle linkage_exception = Handle(); // null handle | |
1486 | |
1487 // definer must notify any waiting threads | |
1488 { | |
1489 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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1490 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name_h, loader_data); |
0 | 1491 assert(probe != NULL, "DEFINE_CLASS placeholder lost?"); |
1492 if (probe != NULL) { | |
1493 if (HAS_PENDING_EXCEPTION) { | |
1494 linkage_exception = Handle(THREAD,PENDING_EXCEPTION); | |
1495 CLEAR_PENDING_EXCEPTION; | |
1496 } else { | |
6983 | 1497 probe->set_instance_klass(k()); |
0 | 1498 } |
1499 probe->set_definer(NULL); | |
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1500 placeholders()->find_and_remove(p_index, p_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, THREAD); |
0 | 1501 SystemDictionary_lock->notify_all(); |
1502 } | |
1503 } | |
1504 | |
1505 // Can't throw exception while holding lock due to rank ordering | |
1506 if (linkage_exception() != NULL) { | |
1507 THROW_OOP_(linkage_exception(), nh); // throws exception and returns | |
1508 } | |
1509 | |
1510 return k; | |
1511 } | |
1512 Handle SystemDictionary::compute_loader_lock_object(Handle class_loader, TRAPS) { | |
1513 // If class_loader is NULL we synchronize on _system_loader_lock_obj | |
1514 if (class_loader.is_null()) { | |
1515 return Handle(THREAD, _system_loader_lock_obj); | |
1516 } else { | |
1517 return class_loader; | |
1518 } | |
1519 } | |
1520 | |
1521 // This method is added to check how often we have to wait to grab loader | |
1522 // lock. The results are being recorded in the performance counters defined in | |
1523 // ClassLoader::_sync_systemLoaderLockContentionRate and | |
1524 // ClassLoader::_sync_nonSystemLoaderLockConteionRate. | |
1525 void SystemDictionary::check_loader_lock_contention(Handle loader_lock, TRAPS) { | |
1526 if (!UsePerfData) { | |
1527 return; | |
1528 } | |
1529 | |
1530 assert(!loader_lock.is_null(), "NULL lock object"); | |
1531 | |
1532 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader_lock) | |
1533 == ObjectSynchronizer::owner_other) { | |
1534 // contention will likely happen, so increment the corresponding | |
1535 // contention counter. | |
1536 if (loader_lock() == _system_loader_lock_obj) { | |
1537 ClassLoader::sync_systemLoaderLockContentionRate()->inc(); | |
1538 } else { | |
1539 ClassLoader::sync_nonSystemLoaderLockContentionRate()->inc(); | |
1540 } | |
1541 } | |
1542 } | |
1543 | |
1544 // ---------------------------------------------------------------------------- | |
1545 // Lookup | |
1546 | |
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1547 Klass* SystemDictionary::find_class(int index, unsigned int hash, |
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1548 Symbol* class_name, |
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1549 ClassLoaderData* loader_data) { |
0 | 1550 assert_locked_or_safepoint(SystemDictionary_lock); |
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1551 assert (index == dictionary()->index_for(class_name, loader_data), |
0 | 1552 "incorrect index?"); |
1553 | |
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1554 Klass* k = dictionary()->find_class(index, hash, class_name, loader_data); |
0 | 1555 return k; |
1556 } | |
1557 | |
1558 | |
1559 // Basic find on classes in the midst of being loaded | |
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1560 Symbol* SystemDictionary::find_placeholder(Symbol* class_name, |
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1561 ClassLoaderData* loader_data) { |
0 | 1562 assert_locked_or_safepoint(SystemDictionary_lock); |
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1563 unsigned int p_hash = placeholders()->compute_hash(class_name, loader_data); |
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1564 int p_index = placeholders()->hash_to_index(p_hash); |
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1565 return placeholders()->find_entry(p_index, p_hash, class_name, loader_data); |
0 | 1566 } |
1567 | |
1568 | |
1569 // Used for assertions and verification only | |
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1570 Klass* SystemDictionary::find_class(Symbol* class_name, ClassLoaderData* loader_data) { |
0 | 1571 #ifndef ASSERT |
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|
1572 guarantee(VerifyBeforeGC || |
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|
1573 VerifyDuringGC || |
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|
1574 VerifyBeforeExit || |
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|
1575 VerifyDuringStartup || |
0 | 1576 VerifyAfterGC, "too expensive"); |
1577 #endif | |
1578 assert_locked_or_safepoint(SystemDictionary_lock); | |
1579 | |
1580 // First look in the loaded class array | |
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1581 unsigned int d_hash = dictionary()->compute_hash(class_name, loader_data); |
0 | 1582 int d_index = dictionary()->hash_to_index(d_hash); |
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1583 return find_class(d_index, d_hash, class_name, loader_data); |
0 | 1584 } |
1585 | |
1586 | |
1587 // Get the next class in the diictionary. | |
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1588 Klass* SystemDictionary::try_get_next_class() { |
0 | 1589 return dictionary()->try_get_next_class(); |
1590 } | |
1591 | |
1592 | |
1593 // ---------------------------------------------------------------------------- | |
1594 // Update hierachy. This is done before the new klass has been added to the SystemDictionary. The Recompile_lock | |
1595 // is held, to ensure that the compiler is not using the class hierachy, and that deoptimization will kick in | |
1596 // before a new class is used. | |
1597 | |
1598 void SystemDictionary::add_to_hierarchy(instanceKlassHandle k, TRAPS) { | |
1599 assert(k.not_null(), "just checking"); | |
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1600 assert_locked_or_safepoint(Compile_lock); |
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1601 |
0 | 1602 // Link into hierachy. Make sure the vtables are initialized before linking into |
1603 k->append_to_sibling_list(); // add to superklass/sibling list | |
1604 k->process_interfaces(THREAD); // handle all "implements" declarations | |
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1605 k->set_init_state(InstanceKlass::loaded); |
0 | 1606 // Now flush all code that depended on old class hierarchy. |
1607 // Note: must be done *after* linking k into the hierarchy (was bug 12/9/97) | |
1608 // Also, first reinitialize vtable because it may have gotten out of synch | |
1609 // while the new class wasn't connected to the class hierarchy. | |
1610 Universe::flush_dependents_on(k); | |
1611 } | |
1612 | |
1613 | |
1614 // ---------------------------------------------------------------------------- | |
1615 // GC support | |
1616 | |
1617 // Following roots during mark-sweep is separated in two phases. | |
1618 // | |
1619 // The first phase follows preloaded classes and all other system | |
1620 // classes, since these will never get unloaded anyway. | |
1621 // | |
1622 // The second phase removes (unloads) unreachable classes from the | |
1623 // system dictionary and follows the remaining classes' contents. | |
1624 | |
1625 void SystemDictionary::always_strong_oops_do(OopClosure* blk) { | |
1626 blk->do_oop(&_java_system_loader); | |
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1627 blk->do_oop(&_system_loader_lock_obj); |
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1628 #ifdef GRAAL |
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1629 blk->do_oop(&_graal_loader); |
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1630 #endif |
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1631 |
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1632 dictionary()->always_strong_oops_do(blk); |
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1633 |
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1634 // Visit extra methods |
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1635 invoke_method_table()->oops_do(blk); |
0 | 1636 } |
1637 | |
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1638 void SystemDictionary::always_strong_classes_do(KlassClosure* closure) { |
0 | 1639 // Follow all system classes and temporary placeholders in dictionary |
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1640 dictionary()->always_strong_classes_do(closure); |
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1641 |
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1642 // Placeholders. These represent classes we're actively loading. |
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1643 placeholders()->classes_do(closure); |
0 | 1644 } |
1645 | |
4864
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1646 // Calculate a "good" systemdictionary size based |
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1647 // on predicted or current loaded classes count |
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1648 int SystemDictionary::calculate_systemdictionary_size(int classcount) { |
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1649 int newsize = _old_default_sdsize; |
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1650 if ((classcount > 0) && !DumpSharedSpaces) { |
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1651 int desiredsize = classcount/_average_depth_goal; |
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1652 for (newsize = _primelist[_sdgeneration]; _sdgeneration < _prime_array_size -1; |
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1653 newsize = _primelist[++_sdgeneration]) { |
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1654 if (desiredsize <= newsize) { |
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1655 break; |
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|
1656 } |
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1657 } |
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1658 } |
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1659 return newsize; |
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1660 } |
10405 | 1661 |
12837 | 1662 #ifdef ASSERT |
1663 class VerifySDReachableAndLiveClosure : public OopClosure { | |
1664 private: | |
1665 BoolObjectClosure* _is_alive; | |
1666 | |
1667 template <class T> void do_oop_work(T* p) { | |
1668 oop obj = oopDesc::load_decode_heap_oop(p); | |
1669 guarantee(_is_alive->do_object_b(obj), "Oop in system dictionary must be live"); | |
1670 } | |
1671 | |
1672 public: | |
1673 VerifySDReachableAndLiveClosure(BoolObjectClosure* is_alive) : OopClosure(), _is_alive(is_alive) { } | |
1674 | |
1675 virtual void do_oop(oop* p) { do_oop_work(p); } | |
1676 virtual void do_oop(narrowOop* p) { do_oop_work(p); } | |
1677 }; | |
1678 #endif | |
1679 | |
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1680 // Assumes classes in the SystemDictionary are only unloaded at a safepoint |
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1681 // Note: anonymous classes are not in the SD. |
0 | 1682 bool SystemDictionary::do_unloading(BoolObjectClosure* is_alive) { |
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1683 // First, mark for unload all ClassLoaderData referencing a dead class loader. |
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1684 bool has_dead_loaders = ClassLoaderDataGraph::do_unloading(is_alive); |
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1685 bool unloading_occurred = false; |
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1686 if (has_dead_loaders) { |
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1687 unloading_occurred = dictionary()->do_unloading(); |
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1688 constraints()->purge_loader_constraints(); |
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1689 resolution_errors()->purge_resolution_errors(); |
12837 | 1690 } |
1691 // Oops referenced by the system dictionary may get unreachable independently | |
1692 // of the class loader (eg. cached protection domain oops). So we need to | |
1693 // explicitly unlink them here instead of in Dictionary::do_unloading. | |
1694 dictionary()->unlink(is_alive); | |
1695 #ifdef ASSERT | |
1696 VerifySDReachableAndLiveClosure cl(is_alive); | |
1697 dictionary()->oops_do(&cl); | |
1698 #endif | |
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1699 return unloading_occurred; |
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1700 } |
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1701 |
0 | 1702 void SystemDictionary::oops_do(OopClosure* f) { |
1703 f->do_oop(&_java_system_loader); | |
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1704 f->do_oop(&_system_loader_lock_obj); |
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1705 #ifdef GRAAL |
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1706 f->do_oop(&_graal_loader); |
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1707 #endif |
0 | 1708 |
1709 // Adjust dictionary | |
1710 dictionary()->oops_do(f); | |
1711 | |
710 | 1712 // Visit extra methods |
1903 | 1713 invoke_method_table()->oops_do(f); |
0 | 1714 } |
1715 | |
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1716 // Extended Class redefinition support. |
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1717 // If one of these classes is replaced, we need to replace it in these places. |
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1718 // KlassClosure::do_klass should take the address of a class but we can |
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1719 // change that later. |
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1720 void SystemDictionary::preloaded_classes_do(KlassClosure* f) { |
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1721 for (int k = (int)FIRST_WKID; k < (int)WKID_LIMIT; k++) { |
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1722 f->do_klass(_well_known_klasses[k]); |
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1723 } |
0 | 1724 |
1725 { | |
1726 for (int i = 0; i < T_VOID+1; i++) { | |
1727 if (_box_klasses[i] != NULL) { | |
1728 assert(i >= T_BOOLEAN, "checking"); | |
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1729 f->do_klass(_box_klasses[i]); |
0 | 1730 } |
1731 } | |
1732 } | |
1733 | |
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1734 FilteredFieldsMap::classes_do(f); |
0 | 1735 } |
1736 | |
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1737 void SystemDictionary::lazily_loaded_classes_do(KlassClosure* f) { |
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1738 f->do_klass(_abstract_ownable_synchronizer_klass); |
0 | 1739 } |
1740 | |
1741 // Just the classes from defining class loaders | |
1742 // Don't iterate over placeholders | |
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1743 void SystemDictionary::classes_do(void f(Klass*)) { |
0 | 1744 dictionary()->classes_do(f); |
1745 } | |
1746 | |
1747 // Added for initialize_itable_for_klass | |
1748 // Just the classes from defining class loaders | |
1749 // Don't iterate over placeholders | |
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1750 void SystemDictionary::classes_do(void f(Klass*, TRAPS), TRAPS) { |
0 | 1751 dictionary()->classes_do(f, CHECK); |
1752 } | |
1753 | |
1754 // All classes, and their class loaders | |
1755 // Don't iterate over placeholders | |
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1756 void SystemDictionary::classes_do(void f(Klass*, ClassLoaderData*)) { |
0 | 1757 dictionary()->classes_do(f); |
1758 } | |
1759 | |
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1760 void SystemDictionary::placeholders_do(void f(Symbol*)) { |
0 | 1761 placeholders()->entries_do(f); |
1762 } | |
1763 | |
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1764 void SystemDictionary::methods_do(void f(Method*)) { |
0 | 1765 dictionary()->methods_do(f); |
1903 | 1766 invoke_method_table()->methods_do(f); |
0 | 1767 } |
1768 | |
1769 // ---------------------------------------------------------------------------- | |
1770 // Lazily load klasses | |
1771 | |
1772 void SystemDictionary::load_abstract_ownable_synchronizer_klass(TRAPS) { | |
1773 assert(JDK_Version::is_gte_jdk16x_version(), "Must be JDK 1.6 or later"); | |
1774 | |
1775 // if multiple threads calling this function, only one thread will load | |
1776 // the class. The other threads will find the loaded version once the | |
1777 // class is loaded. | |
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1778 Klass* aos = _abstract_ownable_synchronizer_klass; |
0 | 1779 if (aos == NULL) { |
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1780 Klass* k = resolve_or_fail(vmSymbols::java_util_concurrent_locks_AbstractOwnableSynchronizer(), true, CHECK); |
0 | 1781 // Force a fence to prevent any read before the write completes |
1782 OrderAccess::fence(); | |
1783 _abstract_ownable_synchronizer_klass = k; | |
1784 } | |
1785 } | |
1786 | |
1787 // ---------------------------------------------------------------------------- | |
1788 // Initialization | |
1789 | |
1790 void SystemDictionary::initialize(TRAPS) { | |
1791 // Allocate arrays | |
1792 assert(dictionary() == NULL, | |
1793 "SystemDictionary should only be initialized once"); | |
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1794 _sdgeneration = 0; |
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1795 _dictionary = new Dictionary(calculate_systemdictionary_size(PredictedLoadedClassCount)); |
1903 | 1796 _placeholders = new PlaceholderTable(_nof_buckets); |
0 | 1797 _number_of_modifications = 0; |
1903 | 1798 _loader_constraints = new LoaderConstraintTable(_loader_constraint_size); |
1799 _resolution_errors = new ResolutionErrorTable(_resolution_error_size); | |
1800 _invoke_method_table = new SymbolPropertyTable(_invoke_method_size); | |
0 | 1801 |
1802 // Allocate private object used as system class loader lock | |
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1803 _system_loader_lock_obj = oopFactory::new_intArray(0, CHECK); |
0 | 1804 // Initialize basic classes |
1805 initialize_preloaded_classes(CHECK); | |
1806 } | |
1807 | |
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1808 // Compact table of directions on the initialization of klasses: |
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1809 static const short wk_init_info[] = { |
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1810 #define WK_KLASS_INIT_INFO(name, symbol, option) \ |
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1811 ( ((int)vmSymbols::VM_SYMBOL_ENUM_NAME(symbol) \ |
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1812 << SystemDictionary::CEIL_LG_OPTION_LIMIT) \ |
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1813 | (int)SystemDictionary::option ), |
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1814 WK_KLASSES_DO(WK_KLASS_INIT_INFO) |
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1815 #undef WK_KLASS_INIT_INFO |
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1816 0 |
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1817 }; |
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1818 |
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1819 bool SystemDictionary::initialize_wk_klass(WKID id, int init_opt, TRAPS) { |
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1820 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1821 int info = wk_init_info[id - FIRST_WKID]; |
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1822 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1823 Symbol* symbol = vmSymbols::symbol_at((vmSymbols::SID)sid); |
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1824 Klass** klassp = &_well_known_klasses[id]; |
2460 | 1825 bool must_load = (init_opt < SystemDictionary::Opt); |
7951 | 1826 if ((*klassp) == NULL) { |
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1827 #ifdef GRAAL |
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1828 bool is_graal = init_opt == SystemDictionary::Graal; |
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1829 assert(is_graal == (id >= (int)FIRST_GRAAL_WKID && id <= (int)LAST_GRAAL_WKID), |
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1830 "Graal WKIDs must be contiguous and separate from non-Graal WKIDs"); |
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1831 if (is_graal) { |
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1832 (*klassp) = resolve_or_fail(symbol, _graal_loader, Handle(), true, CHECK_0); // load required Graal class |
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1833 } else |
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1834 #endif |
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1835 if (must_load) { |
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1836 (*klassp) = resolve_or_fail(symbol, true, CHECK_0); // load required class |
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1837 } else { |
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1838 (*klassp) = resolve_or_null(symbol, CHECK_0); // load optional klass |
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1839 } |
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1840 } |
2460 | 1841 return ((*klassp) != NULL); |
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1842 } |
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1843 |
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1844 void SystemDictionary::initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS) { |
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1845 assert((int)start_id <= (int)limit_id, "IDs are out of order!"); |
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1846 for (int id = (int)start_id; id < (int)limit_id; id++) { |
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1847 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1848 int info = wk_init_info[id - FIRST_WKID]; |
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1849 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1850 int opt = (info & right_n_bits(CEIL_LG_OPTION_LIMIT)); |
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1851 |
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1852 initialize_wk_klass((WKID)id, opt, CHECK); |
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1853 } |
710 | 1854 |
1855 // move the starting value forward to the limit: | |
1856 start_id = limit_id; | |
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1857 } |
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1858 |
0 | 1859 void SystemDictionary::initialize_preloaded_classes(TRAPS) { |
1142 | 1860 assert(WK_KLASS(Object_klass) == NULL, "preloaded classes should only be initialized once"); |
0 | 1861 // Preload commonly used klasses |
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1862 WKID scan = FIRST_WKID; |
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1863 // first do Object, then String, Class |
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1864 if (UseSharedSpaces) { |
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1865 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Object_klass), scan, CHECK); |
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1866 // Initialize the constant pool for the Object_class |
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1867 InstanceKlass* ik = InstanceKlass::cast(Object_klass()); |
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1868 ik->constants()->restore_unshareable_info(CHECK); |
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1869 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
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1870 } else { |
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1871 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
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1872 } |
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1873 |
6057 | 1874 // Calculate offsets for String and Class classes since they are loaded and |
1875 // can be used after this point. | |
1876 java_lang_String::compute_offsets(); | |
3938 | 1877 java_lang_Class::compute_offsets(); |
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1878 |
0 | 1879 // Fixup mirrors for classes loaded before java.lang.Class. |
1880 // These calls iterate over the objects currently in the perm gen | |
1881 // so calling them at this point is matters (not before when there | |
1882 // are fewer objects and not later after there are more objects | |
1883 // in the perm gen. | |
1884 Universe::initialize_basic_type_mirrors(CHECK); | |
1885 Universe::fixup_mirrors(CHECK); | |
1886 | |
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1887 // do a bunch more: |
1142 | 1888 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Reference_klass), scan, CHECK); |
0 | 1889 |
1890 // Preload ref klasses and set reference types | |
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1891 InstanceKlass::cast(WK_KLASS(Reference_klass))->set_reference_type(REF_OTHER); |
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1892 InstanceRefKlass::update_nonstatic_oop_maps(WK_KLASS(Reference_klass)); |
0 | 1893 |
1142 | 1894 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(PhantomReference_klass), scan, CHECK); |
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1895 InstanceKlass::cast(WK_KLASS(SoftReference_klass))->set_reference_type(REF_SOFT); |
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1896 InstanceKlass::cast(WK_KLASS(WeakReference_klass))->set_reference_type(REF_WEAK); |
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1897 InstanceKlass::cast(WK_KLASS(FinalReference_klass))->set_reference_type(REF_FINAL); |
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1898 InstanceKlass::cast(WK_KLASS(PhantomReference_klass))->set_reference_type(REF_PHANTOM); |
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1899 |
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1900 // JSR 292 classes |
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1901 WKID jsr292_group_start = WK_KLASS_ENUM_NAME(MethodHandle_klass); |
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1902 WKID jsr292_group_end = WK_KLASS_ENUM_NAME(VolatileCallSite_klass); |
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1903 initialize_wk_klasses_until(jsr292_group_start, scan, CHECK); |
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1904 if (EnableInvokeDynamic) { |
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1905 initialize_wk_klasses_through(jsr292_group_end, scan, CHECK); |
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1906 } else { |
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1907 // Skip the JSR 292 classes, if not enabled. |
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1908 scan = WKID(jsr292_group_end + 1); |
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1909 } |
710 | 1910 |
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1911 initialize_wk_klasses_until(NOT_GRAAL(WKID_LIMIT) GRAAL_ONLY(FIRST_GRAAL_WKID), scan, CHECK); |
0 | 1912 |
1142 | 1913 _box_klasses[T_BOOLEAN] = WK_KLASS(Boolean_klass); |
1914 _box_klasses[T_CHAR] = WK_KLASS(Character_klass); | |
1915 _box_klasses[T_FLOAT] = WK_KLASS(Float_klass); | |
1916 _box_klasses[T_DOUBLE] = WK_KLASS(Double_klass); | |
1917 _box_klasses[T_BYTE] = WK_KLASS(Byte_klass); | |
1918 _box_klasses[T_SHORT] = WK_KLASS(Short_klass); | |
1919 _box_klasses[T_INT] = WK_KLASS(Integer_klass); | |
1920 _box_klasses[T_LONG] = WK_KLASS(Long_klass); | |
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1921 //_box_klasses[T_OBJECT] = WK_KLASS(object_klass); |
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1922 //_box_klasses[T_ARRAY] = WK_KLASS(object_klass); |
0 | 1923 |
1924 { // Compute whether we should use loadClass or loadClassInternal when loading classes. | |
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1925 Method* method = InstanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::loadClassInternal_name(), vmSymbols::string_class_signature()); |
0 | 1926 _has_loadClassInternal = (method != NULL); |
1927 } | |
1928 { // Compute whether we should use checkPackageAccess or NOT | |
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1929 Method* method = InstanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::checkPackageAccess_name(), vmSymbols::class_protectiondomain_signature()); |
0 | 1930 _has_checkPackageAccess = (method != NULL); |
1931 } | |
1932 } | |
1933 | |
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1934 #ifdef GRAAL |
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1935 void SystemDictionary::initialize_preloaded_graal_classes(TRAPS) { |
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1936 assert(WK_KLASS(CompilerThread_klass) == NULL, "preloaded Graal classes should only be initialized once"); |
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1937 if (UseGraalClassLoader) { |
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1938 _graal_loader = GraalRuntime::compute_graal_class_loader(CHECK); |
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1939 } |
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1940 |
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1941 WKID scan = FIRST_GRAAL_WKID; |
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1942 initialize_wk_klasses_through(LAST_GRAAL_WKID, scan, CHECK); |
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1943 } |
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1944 #endif |
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1945 |
0 | 1946 // Tells if a given klass is a box (wrapper class, such as java.lang.Integer). |
1947 // If so, returns the basic type it holds. If not, returns T_OBJECT. | |
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1948 BasicType SystemDictionary::box_klass_type(Klass* k) { |
0 | 1949 assert(k != NULL, ""); |
1950 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { | |
1951 if (_box_klasses[i] == k) | |
1952 return (BasicType)i; | |
1953 } | |
1954 return T_OBJECT; | |
1955 } | |
1956 | |
1957 // Constraints on class loaders. The details of the algorithm can be | |
1958 // found in the OOPSLA'98 paper "Dynamic Class Loading in the Java | |
1959 // Virtual Machine" by Sheng Liang and Gilad Bracha. The basic idea is | |
1960 // that the system dictionary needs to maintain a set of contraints that | |
1961 // must be satisfied by all classes in the dictionary. | |
1962 // if defining is true, then LinkageError if already in systemDictionary | |
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1963 // if initiating loader, then ok if InstanceKlass matches existing entry |
0 | 1964 |
1965 void SystemDictionary::check_constraints(int d_index, unsigned int d_hash, | |
1966 instanceKlassHandle k, | |
1967 Handle class_loader, bool defining, | |
1968 TRAPS) { | |
1969 const char *linkage_error = NULL; | |
1970 { | |
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1971 Symbol* name = k->name(); |
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1972 ClassLoaderData *loader_data = class_loader_data(class_loader); |
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1973 |
0 | 1974 MutexLocker mu(SystemDictionary_lock, THREAD); |
1975 | |
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1976 Klass* check = find_class(d_index, d_hash, name, loader_data); |
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1977 if (check != (Klass*)NULL) { |
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1978 // if different InstanceKlass - duplicate class definition, |
0 | 1979 // else - ok, class loaded by a different thread in parallel, |
1980 // we should only have found it if it was done loading and ok to use | |
1981 // system dictionary only holds instance classes, placeholders | |
1982 // also holds array classes | |
1983 | |
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1984 assert(check->oop_is_instance(), "noninstance in systemdictionary"); |
0 | 1985 if ((defining == true) || (k() != check)) { |
1986 linkage_error = "loader (instance of %s): attempted duplicate class " | |
1987 "definition for name: \"%s\""; | |
1988 } else { | |
1989 return; | |
1990 } | |
1991 } | |
1992 | |
1993 #ifdef ASSERT | |
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1994 Symbol* ph_check = find_placeholder(name, loader_data); |
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1995 assert(ph_check == NULL || ph_check == name, "invalid symbol"); |
0 | 1996 #endif |
1997 | |
1998 if (linkage_error == NULL) { | |
1999 if (constraints()->check_or_update(k, class_loader, name) == false) { | |
2000 linkage_error = "loader constraint violation: loader (instance of %s)" | |
2001 " previously initiated loading for a different type with name \"%s\""; | |
2002 } | |
2003 } | |
2004 } | |
2005 | |
2006 // Throw error now if needed (cannot throw while holding | |
2007 // SystemDictionary_lock because of rank ordering) | |
2008 | |
2009 if (linkage_error) { | |
2010 ResourceMark rm(THREAD); | |
2011 const char* class_loader_name = loader_name(class_loader()); | |
2012 char* type_name = k->name()->as_C_string(); | |
2013 size_t buflen = strlen(linkage_error) + strlen(class_loader_name) + | |
2014 strlen(type_name); | |
2015 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
2016 jio_snprintf(buf, buflen, linkage_error, class_loader_name, type_name); | |
2017 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); | |
2018 } | |
2019 } | |
2020 | |
2021 | |
2022 // Update system dictionary - done after check_constraint and add_to_hierachy | |
2023 // have been called. | |
2024 void SystemDictionary::update_dictionary(int d_index, unsigned int d_hash, | |
2025 int p_index, unsigned int p_hash, | |
2026 instanceKlassHandle k, | |
2027 Handle class_loader, | |
2028 TRAPS) { | |
2029 // Compile_lock prevents systemDictionary updates during compilations | |
2030 assert_locked_or_safepoint(Compile_lock); | |
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2031 Symbol* name = k->name(); |
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2032 ClassLoaderData *loader_data = class_loader_data(class_loader); |
0 | 2033 |
2034 { | |
2035 MutexLocker mu1(SystemDictionary_lock, THREAD); | |
2036 | |
2037 // See whether biased locking is enabled and if so set it for this | |
2038 // klass. | |
2039 // Note that this must be done past the last potential blocking | |
2040 // point / safepoint. We enable biased locking lazily using a | |
2041 // VM_Operation to iterate the SystemDictionary and installing the | |
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2042 // biasable mark word into each InstanceKlass's prototype header. |
0 | 2043 // To avoid race conditions where we accidentally miss enabling the |
2044 // optimization for one class in the process of being added to the | |
2045 // dictionary, we must not safepoint after the test of | |
2046 // BiasedLocking::enabled(). | |
2047 if (UseBiasedLocking && BiasedLocking::enabled()) { | |
2048 // Set biased locking bit for all loaded classes; it will be | |
2049 // cleared if revocation occurs too often for this type | |
2050 // NOTE that we must only do this when the class is initally | |
2051 // defined, not each time it is referenced from a new class loader | |
2052 if (k->class_loader() == class_loader()) { | |
2053 k->set_prototype_header(markOopDesc::biased_locking_prototype()); | |
2054 } | |
2055 } | |
2056 | |
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2057 // Make a new system dictionary entry. |
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2058 Klass* sd_check = find_class(d_index, d_hash, name, loader_data); |
0 | 2059 if (sd_check == NULL) { |
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2060 dictionary()->add_klass(name, loader_data, k); |
0 | 2061 notice_modification(); |
2062 } | |
2063 #ifdef ASSERT | |
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2064 sd_check = find_class(d_index, d_hash, name, loader_data); |
0 | 2065 assert (sd_check != NULL, "should have entry in system dictionary"); |
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2066 // Note: there may be a placeholder entry: for circularity testing |
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2067 // or for parallel defines |
0 | 2068 #endif |
2069 SystemDictionary_lock->notify_all(); | |
2070 } | |
2071 } | |
2072 | |
2073 | |
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2074 // Try to find a class name using the loader constraints. The |
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2075 // loader constraints might know about a class that isn't fully loaded |
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2076 // yet and these will be ignored. |
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2077 Klass* SystemDictionary::find_constrained_instance_or_array_klass( |
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2078 Symbol* class_name, Handle class_loader, TRAPS) { |
0 | 2079 |
2080 // First see if it has been loaded directly. | |
2081 // Force the protection domain to be null. (This removes protection checks.) | |
2082 Handle no_protection_domain; | |
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2083 Klass* klass = find_instance_or_array_klass(class_name, class_loader, |
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2084 no_protection_domain, CHECK_NULL); |
0 | 2085 if (klass != NULL) |
2086 return klass; | |
2087 | |
2088 // Now look to see if it has been loaded elsewhere, and is subject to | |
2089 // a loader constraint that would require this loader to return the | |
2090 // klass that is already loaded. | |
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2091 if (FieldType::is_array(class_name)) { |
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2092 // For array classes, their Klass*s are not kept in the |
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2093 // constraint table. The element Klass*s are. |
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2094 FieldArrayInfo fd; |
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2095 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
0 | 2096 if (t != T_OBJECT) { |
2097 klass = Universe::typeArrayKlassObj(t); | |
2098 } else { | |
2099 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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2100 klass = constraints()->find_constrained_klass(fd.object_key(), class_loader); |
0 | 2101 } |
1336 | 2102 // If element class already loaded, allocate array klass |
0 | 2103 if (klass != NULL) { |
6983 | 2104 klass = klass->array_klass_or_null(fd.dimension()); |
0 | 2105 } |
2106 } else { | |
2107 MutexLocker mu(SystemDictionary_lock, THREAD); | |
2108 // Non-array classes are easy: simply check the constraint table. | |
2109 klass = constraints()->find_constrained_klass(class_name, class_loader); | |
2110 } | |
2111 | |
2112 return klass; | |
2113 } | |
2114 | |
2115 | |
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2116 bool SystemDictionary::add_loader_constraint(Symbol* class_name, |
0 | 2117 Handle class_loader1, |
2118 Handle class_loader2, | |
2119 Thread* THREAD) { | |
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2120 ClassLoaderData* loader_data1 = class_loader_data(class_loader1); |
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2121 ClassLoaderData* loader_data2 = class_loader_data(class_loader2); |
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2122 |
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2123 Symbol* constraint_name = NULL; |
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2124 if (!FieldType::is_array(class_name)) { |
1336 | 2125 constraint_name = class_name; |
2126 } else { | |
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2127 // For array classes, their Klass*s are not kept in the |
1336 | 2128 // constraint table. The element classes are. |
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2129 FieldArrayInfo fd; |
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2130 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(false)); |
1336 | 2131 // primitive types always pass |
2132 if (t != T_OBJECT) { | |
2133 return true; | |
2134 } else { | |
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2135 constraint_name = fd.object_key(); |
1336 | 2136 } |
2137 } | |
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2138 unsigned int d_hash1 = dictionary()->compute_hash(constraint_name, loader_data1); |
0 | 2139 int d_index1 = dictionary()->hash_to_index(d_hash1); |
2140 | |
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2141 unsigned int d_hash2 = dictionary()->compute_hash(constraint_name, loader_data2); |
0 | 2142 int d_index2 = dictionary()->hash_to_index(d_hash2); |
2143 { | |
1336 | 2144 MutexLocker mu_s(SystemDictionary_lock, THREAD); |
0 | 2145 |
1336 | 2146 // Better never do a GC while we're holding these oops |
2147 No_Safepoint_Verifier nosafepoint; | |
0 | 2148 |
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2149 Klass* klass1 = find_class(d_index1, d_hash1, constraint_name, loader_data1); |
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2150 Klass* klass2 = find_class(d_index2, d_hash2, constraint_name, loader_data2); |
1336 | 2151 return constraints()->add_entry(constraint_name, klass1, class_loader1, |
2152 klass2, class_loader2); | |
0 | 2153 } |
2154 } | |
2155 | |
2156 // Add entry to resolution error table to record the error when the first | |
2157 // attempt to resolve a reference to a class has failed. | |
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2158 void SystemDictionary::add_resolution_error(constantPoolHandle pool, int which, Symbol* error) { |
0 | 2159 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
2160 int index = resolution_errors()->hash_to_index(hash); | |
2161 { | |
2162 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
2163 resolution_errors()->add_entry(index, hash, pool, which, error); | |
2164 } | |
2165 } | |
2166 | |
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2167 // Delete a resolution error for RedefineClasses for a constant pool is going away |
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2168 void SystemDictionary::delete_resolution_error(ConstantPool* pool) { |
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2169 resolution_errors()->delete_entry(pool); |
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2170 } |
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2171 |
0 | 2172 // Lookup resolution error table. Returns error if found, otherwise NULL. |
2177
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2173 Symbol* SystemDictionary::find_resolution_error(constantPoolHandle pool, int which) { |
0 | 2174 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
2175 int index = resolution_errors()->hash_to_index(hash); | |
2176 { | |
2177 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
2178 ResolutionErrorEntry* entry = resolution_errors()->find_entry(index, hash, pool, which); | |
2177
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2179 return (entry != NULL) ? entry->error() : (Symbol*)NULL; |
0 | 2180 } |
2181 } | |
2182 | |
2183 | |
665
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2184 // Signature constraints ensure that callers and callees agree about |
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2185 // the meaning of type names in their signatures. This routine is the |
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2186 // intake for constraints. It collects them from several places: |
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2187 // |
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2188 // * LinkResolver::resolve_method (if check_access is true) requires |
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2189 // that the resolving class (the caller) and the defining class of |
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2190 // the resolved method (the callee) agree on each type in the |
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2191 // method's signature. |
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2192 // |
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2193 // * LinkResolver::resolve_interface_method performs exactly the same |
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2194 // checks. |
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2195 // |
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2196 // * LinkResolver::resolve_field requires that the constant pool |
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2197 // attempting to link to a field agree with the field's defining |
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2198 // class about the type of the field signature. |
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2199 // |
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2200 // * klassVtable::initialize_vtable requires that, when a class |
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2201 // overrides a vtable entry allocated by a superclass, that the |
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2202 // overriding method (i.e., the callee) agree with the superclass |
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2203 // on each type in the method's signature. |
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2204 // |
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2205 // * klassItable::initialize_itable requires that, when a class fills |
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2206 // in its itables, for each non-abstract method installed in an |
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2207 // itable, the method (i.e., the callee) agree with the interface |
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2208 // on each type in the method's signature. |
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2209 // |
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2210 // All those methods have a boolean (check_access, checkconstraints) |
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2211 // which turns off the checks. This is used from specialized contexts |
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2212 // such as bootstrapping, dumping, and debugging. |
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2213 // |
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2214 // No direct constraint is placed between the class and its |
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2215 // supertypes. Constraints are only placed along linked relations |
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2216 // between callers and callees. When a method overrides or implements |
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2217 // an abstract method in a supertype (superclass or interface), the |
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2218 // constraints are placed as if the supertype were the caller to the |
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2219 // overriding method. (This works well, since callers to the |
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2220 // supertype have already established agreement between themselves and |
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2221 // the supertype.) As a result of all this, a class can disagree with |
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2222 // its supertype about the meaning of a type name, as long as that |
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2223 // class neither calls a relevant method of the supertype, nor is |
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2224 // called (perhaps via an override) from the supertype. |
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2225 // |
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2226 // |
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2227 // SystemDictionary::check_signature_loaders(sig, l1, l2) |
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2228 // |
0 | 2229 // Make sure all class components (including arrays) in the given |
2230 // signature will be resolved to the same class in both loaders. | |
2231 // Returns the name of the type that failed a loader constraint check, or | |
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2232 // NULL if no constraint failed. No exception except OOME is thrown. |
1336 | 2233 // Arrays are not added to the loader constraint table, their elements are. |
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2234 Symbol* SystemDictionary::check_signature_loaders(Symbol* signature, |
0 | 2235 Handle loader1, Handle loader2, |
2236 bool is_method, TRAPS) { | |
2237 // Nothing to do if loaders are the same. | |
2238 if (loader1() == loader2()) { | |
2239 return NULL; | |
2240 } | |
2241 | |
2242 SignatureStream sig_strm(signature, is_method); | |
2243 while (!sig_strm.is_done()) { | |
2244 if (sig_strm.is_object()) { | |
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2245 Symbol* sig = sig_strm.as_symbol(CHECK_NULL); |
0 | 2246 if (!add_loader_constraint(sig, loader1, loader2, THREAD)) { |
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2247 return sig; |
0 | 2248 } |
2249 } | |
2250 sig_strm.next(); | |
2251 } | |
2252 return NULL; | |
2253 } | |
2254 | |
2255 | |
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2256 methodHandle SystemDictionary::find_method_handle_intrinsic(vmIntrinsics::ID iid, |
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2257 Symbol* signature, |
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2258 TRAPS) { |
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|
2259 methodHandle empty; |
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|
2260 assert(EnableInvokeDynamic, ""); |
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|
2261 assert(MethodHandles::is_signature_polymorphic(iid) && |
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2262 MethodHandles::is_signature_polymorphic_intrinsic(iid) && |
1d7922586cf6
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|
2263 iid != vmIntrinsics::_invokeGeneric, |
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|
2264 err_msg("must be a known MH intrinsic iid=%d: %s", iid, vmIntrinsics::name_at(iid))); |
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2265 |
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2266 unsigned int hash = invoke_method_table()->compute_hash(signature, iid); |
710 | 2267 int index = invoke_method_table()->hash_to_index(hash); |
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2268 SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, iid); |
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2269 methodHandle m; |
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2270 if (spe == NULL || spe->method() == NULL) { |
1508
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6939196: method handle signatures off the boot class path get linkage errors
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|
2271 spe = NULL; |
710 | 2272 // Must create lots of stuff here, but outside of the SystemDictionary lock. |
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2273 m = Method::make_method_handle_intrinsic(iid, signature, CHECK_(empty)); |
6266
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2274 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_highest_tier, |
1d7922586cf6
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2275 methodHandle(), CompileThreshold, "MH", CHECK_(empty)); |
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2276 |
710 | 2277 // Now grab the lock. We might have to throw away the new method, |
2278 // if a racing thread has managed to install one at the same time. | |
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2279 { |
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2280 MutexLocker ml(SystemDictionary_lock, THREAD); |
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2281 spe = invoke_method_table()->find_entry(index, hash, signature, iid); |
710 | 2282 if (spe == NULL) |
6266
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2283 spe = invoke_method_table()->add_entry(index, hash, signature, iid); |
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2284 if (spe->method() == NULL) |
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2285 spe->set_method(m()); |
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2286 } |
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|
2287 } else if (spe->method()->code() == NULL) { |
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|
2288 CompileBroker::compile_method(spe->method(), InvocationEntryBci, CompLevel_highest_tier, |
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|
2289 methodHandle(), CompileThreshold, "MH", CHECK_(empty)); |
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2290 } |
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2291 |
16348
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Gilles Duboscq <duboscq@ssw.jku.at>
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|
2292 guarantee(spe != NULL && spe->method() != NULL && (!UseCompiler || spe->method()->code() != NULL), "Could not compile a method handle intrinsic"); |
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2293 return spe->method(); |
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2294 } |
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2295 |
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2296 // Helper for unpacking the return value from linkMethod and linkCallSite. |
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2297 static methodHandle unpack_method_and_appendix(Handle mname, |
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|
2298 KlassHandle accessing_klass, |
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2299 objArrayHandle appendix_box, |
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2300 Handle* appendix_result, |
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2301 TRAPS) { |
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2302 methodHandle empty; |
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2303 if (mname.not_null()) { |
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|
2304 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); |
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2305 if (vmtarget != NULL && vmtarget->is_method()) { |
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2306 Method* m = (Method*)vmtarget; |
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2307 oop appendix = appendix_box->obj_at(0); |
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2308 if (TraceMethodHandles) { |
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|
2309 #ifndef PRODUCT |
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17883
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|
2310 tty->print("Linked method=" INTPTR_FORMAT ": ", p2i(m)); |
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2311 m->print(); |
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2312 if (appendix != NULL) { tty->print("appendix = "); appendix->print(); } |
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2313 tty->cr(); |
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2314 #endif //PRODUCT |
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6939861: JVM should handle more conversion operations
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2315 } |
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2316 (*appendix_result) = Handle(THREAD, appendix); |
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2317 // the target is stored in the cpCache and if a reference to this |
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2318 // MethodName is dropped we need a way to make sure the |
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2319 // class_loader containing this method is kept alive. |
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2320 // FIXME: the appendix might also preserve this dependency. |
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2321 ClassLoaderData* this_key = InstanceKlass::cast(accessing_klass())->class_loader_data(); |
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2322 this_key->record_dependency(m->method_holder(), CHECK_NULL); // Can throw OOM |
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2323 return methodHandle(THREAD, m); |
710 | 2324 } |
2325 } | |
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2326 THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad value from MethodHandleNatives", empty); |
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2327 return empty; |
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2328 } |
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2329 |
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2330 methodHandle SystemDictionary::find_method_handle_invoker(Symbol* name, |
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2331 Symbol* signature, |
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2332 KlassHandle accessing_klass, |
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2333 Handle *appendix_result, |
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2334 Handle *method_type_result, |
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2335 TRAPS) { |
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2336 methodHandle empty; |
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2337 assert(EnableInvokeDynamic, ""); |
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2338 assert(THREAD->can_call_java() ,""); |
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2339 Handle method_type = |
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2340 SystemDictionary::find_method_handle_type(signature, accessing_klass, CHECK_(empty)); |
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2341 if (false) { // FIXME: Decide if the Java upcall should resolve signatures. |
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2342 method_type = java_lang_String::create_from_symbol(signature, CHECK_(empty)); |
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2343 } |
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2344 |
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2345 KlassHandle mh_klass = SystemDictionary::MethodHandle_klass(); |
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2346 int ref_kind = JVM_REF_invokeVirtual; |
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2347 Handle name_str = StringTable::intern(name, CHECK_(empty)); |
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2348 objArrayHandle appendix_box = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1, CHECK_(empty)); |
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2349 assert(appendix_box->obj_at(0) == NULL, ""); |
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2350 |
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2351 // This should not happen. JDK code should take care of that. |
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2352 if (accessing_klass.is_null() || method_type.is_null()) { |
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2353 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad invokehandle", empty); |
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2354 } |
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2355 |
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2356 // call java.lang.invoke.MethodHandleNatives::linkMethod(... String, MethodType) -> MemberName |
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2357 JavaCallArguments args; |
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2358 args.push_oop(accessing_klass()->java_mirror()); |
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2359 args.push_int(ref_kind); |
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2360 args.push_oop(mh_klass()->java_mirror()); |
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2361 args.push_oop(name_str()); |
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2362 args.push_oop(method_type()); |
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2363 args.push_oop(appendix_box()); |
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2364 JavaValue result(T_OBJECT); |
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2365 JavaCalls::call_static(&result, |
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2366 SystemDictionary::MethodHandleNatives_klass(), |
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2367 vmSymbols::linkMethod_name(), |
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2368 vmSymbols::linkMethod_signature(), |
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|
2369 &args, CHECK_(empty)); |
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2370 Handle mname(THREAD, (oop) result.get_jobject()); |
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2371 (*method_type_result) = method_type; |
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2372 return unpack_method_and_appendix(mname, accessing_klass, appendix_box, appendix_result, THREAD); |
710 | 2373 } |
2374 | |
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2375 |
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2376 // Ask Java code to find or construct a java.lang.invoke.MethodType for the given |
710 | 2377 // signature, as interpreted relative to the given class loader. |
2378 // Because of class loader constraints, all method handle usage must be | |
2379 // consistent with this loader. | |
2177
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2380 Handle SystemDictionary::find_method_handle_type(Symbol* signature, |
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2381 KlassHandle accessing_klass, |
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2382 TRAPS) { |
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2383 Handle empty; |
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2384 vmIntrinsics::ID null_iid = vmIntrinsics::_none; // distinct from all method handle invoker intrinsics |
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2385 unsigned int hash = invoke_method_table()->compute_hash(signature, null_iid); |
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2386 int index = invoke_method_table()->hash_to_index(hash); |
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2387 SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, null_iid); |
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2388 if (spe != NULL && spe->method_type() != NULL) { |
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2389 assert(java_lang_invoke_MethodType::is_instance(spe->method_type()), ""); |
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2390 return Handle(THREAD, spe->method_type()); |
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2391 } else if (!THREAD->can_call_java()) { |
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2392 warning("SystemDictionary::find_method_handle_type called from compiler thread"); // FIXME |
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2393 return Handle(); // do not attempt from within compiler, unless it was cached |
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2394 } |
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2395 |
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2396 Handle class_loader, protection_domain; |
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2397 bool is_on_bcp = true; // keep this true as long as we can materialize from the boot classloader |
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2398 int npts = ArgumentCount(signature).size(); |
1142 | 2399 objArrayHandle pts = oopFactory::new_objArray(SystemDictionary::Class_klass(), npts, CHECK_(empty)); |
710 | 2400 int arg = 0; |
2401 Handle rt; // the return type from the signature | |
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2402 ResourceMark rm(THREAD); |
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2403 for (SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
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2404 oop mirror = NULL; |
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2405 if (is_on_bcp) { |
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2406 // Note: class_loader & protection_domain are both null at this point. |
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2407 mirror = ss.as_java_mirror(class_loader, protection_domain, |
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2408 SignatureStream::ReturnNull, CHECK_(empty)); |
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2409 if (mirror == NULL) { |
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2410 // fall back from BCP to accessing_klass |
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2411 if (accessing_klass.not_null()) { |
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2412 class_loader = Handle(THREAD, InstanceKlass::cast(accessing_klass())->class_loader()); |
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2413 protection_domain = Handle(THREAD, InstanceKlass::cast(accessing_klass())->protection_domain()); |
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2414 } |
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2415 is_on_bcp = false; |
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2416 } |
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2417 } |
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2418 if (!is_on_bcp) { |
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2419 // Resolve, throwing a real error if it doesn't work. |
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2420 mirror = ss.as_java_mirror(class_loader, protection_domain, |
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2421 SignatureStream::NCDFError, CHECK_(empty)); |
710 | 2422 } |
2423 if (ss.at_return_type()) | |
2424 rt = Handle(THREAD, mirror); | |
2425 else | |
2426 pts->obj_at_put(arg++, mirror); | |
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2427 |
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|
2428 // Check accessibility. |
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2429 if (ss.is_object() && accessing_klass.not_null()) { |
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2430 Klass* sel_klass = java_lang_Class::as_Klass(mirror); |
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2431 mirror = NULL; // safety |
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2432 // Emulate ConstantPool::verify_constant_pool_resolve. |
6983 | 2433 if (sel_klass->oop_is_objArray()) |
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2434 sel_klass = ObjArrayKlass::cast(sel_klass)->bottom_klass(); |
6983 | 2435 if (sel_klass->oop_is_instance()) { |
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2436 KlassHandle sel_kh(THREAD, sel_klass); |
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2437 LinkResolver::check_klass_accessability(accessing_klass, sel_kh, CHECK_(empty)); |
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2438 } |
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2439 } |
710 | 2440 } |
2441 assert(arg == npts, ""); | |
2442 | |
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2443 // call java.lang.invoke.MethodHandleNatives::findMethodType(Class rt, Class[] pts) -> MethodType |
710 | 2444 JavaCallArguments args(Handle(THREAD, rt())); |
2445 args.push_oop(pts()); | |
2446 JavaValue result(T_OBJECT); | |
2447 JavaCalls::call_static(&result, | |
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2448 SystemDictionary::MethodHandleNatives_klass(), |
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|
2449 vmSymbols::findMethodHandleType_name(), |
2460 | 2450 vmSymbols::findMethodHandleType_signature(), |
710 | 2451 &args, CHECK_(empty)); |
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2452 Handle method_type(THREAD, (oop) result.get_jobject()); |
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2453 |
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2454 if (is_on_bcp) { |
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2455 // We can cache this MethodType inside the JVM. |
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2456 MutexLocker ml(SystemDictionary_lock, THREAD); |
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2457 spe = invoke_method_table()->find_entry(index, hash, signature, null_iid); |
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2458 if (spe == NULL) |
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2459 spe = invoke_method_table()->add_entry(index, hash, signature, null_iid); |
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2460 if (spe->method_type() == NULL) { |
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2461 spe->set_method_type(method_type()); |
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2462 } |
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|
2463 } |
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|
2464 |
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2465 // report back to the caller with the MethodType |
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2466 return method_type; |
710 | 2467 } |
2468 | |
1602 | 2469 // Ask Java code to find or construct a method handle constant. |
2470 Handle SystemDictionary::link_method_handle_constant(KlassHandle caller, | |
2471 int ref_kind, //e.g., JVM_REF_invokeVirtual | |
2472 KlassHandle callee, | |
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2473 Symbol* name_sym, |
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2474 Symbol* signature, |
1602 | 2475 TRAPS) { |
2476 Handle empty; | |
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2477 Handle name = java_lang_String::create_from_symbol(name_sym, CHECK_(empty)); |
1602 | 2478 Handle type; |
2479 if (signature->utf8_length() > 0 && signature->byte_at(0) == '(') { | |
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2480 type = find_method_handle_type(signature, caller, CHECK_(empty)); |
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2481 } else if (caller.is_null()) { |
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2482 // This should not happen. JDK code should take care of that. |
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2483 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MH constant", empty); |
1602 | 2484 } else { |
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|
2485 ResourceMark rm(THREAD); |
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2486 SignatureStream ss(signature, false); |
1602 | 2487 if (!ss.is_done()) { |
2488 oop mirror = ss.as_java_mirror(caller->class_loader(), caller->protection_domain(), | |
2489 SignatureStream::NCDFError, CHECK_(empty)); | |
2490 type = Handle(THREAD, mirror); | |
2491 ss.next(); | |
2492 if (!ss.is_done()) type = Handle(); // error! | |
2493 } | |
2494 } | |
2495 if (type.is_null()) { | |
2496 THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad signature", empty); | |
2497 } | |
2498 | |
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2499 // call java.lang.invoke.MethodHandleNatives::linkMethodHandleConstant(Class caller, int refKind, Class callee, String name, Object type) -> MethodHandle |
1602 | 2500 JavaCallArguments args; |
2501 args.push_oop(caller->java_mirror()); // the referring class | |
2502 args.push_int(ref_kind); | |
2503 args.push_oop(callee->java_mirror()); // the target class | |
2504 args.push_oop(name()); | |
2505 args.push_oop(type()); | |
2506 JavaValue result(T_OBJECT); | |
2507 JavaCalls::call_static(&result, | |
2508 SystemDictionary::MethodHandleNatives_klass(), | |
2509 vmSymbols::linkMethodHandleConstant_name(), | |
2460 | 2510 vmSymbols::linkMethodHandleConstant_signature(), |
1602 | 2511 &args, CHECK_(empty)); |
2512 return Handle(THREAD, (oop) result.get_jobject()); | |
2513 } | |
710 | 2514 |
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2515 // Ask Java code to find or construct a java.lang.invoke.CallSite for the given |
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2516 // name and signature, as interpreted relative to the given class loader. |
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2517 methodHandle SystemDictionary::find_dynamic_call_site_invoker(KlassHandle caller, |
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2518 Handle bootstrap_specifier, |
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2519 Symbol* name, |
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|
2520 Symbol* type, |
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2521 Handle *appendix_result, |
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2522 Handle *method_type_result, |
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2523 TRAPS) { |
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|
2524 methodHandle empty; |
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|
2525 Handle bsm, info; |
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2526 if (java_lang_invoke_MethodHandle::is_instance(bootstrap_specifier())) { |
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|
2527 bsm = bootstrap_specifier; |
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|
2528 } else { |
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|
2529 assert(bootstrap_specifier->is_objArray(), ""); |
1d7922586cf6
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2530 objArrayHandle args(THREAD, (objArrayOop) bootstrap_specifier()); |
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|
2531 int len = args->length(); |
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|
2532 assert(len >= 1, ""); |
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|
2533 bsm = Handle(THREAD, args->obj_at(0)); |
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2534 if (len > 1) { |
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|
2535 objArrayOop args1 = oopFactory::new_objArray(SystemDictionary::Object_klass(), len-1, CHECK_(empty)); |
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2536 for (int i = 1; i < len; i++) |
1d7922586cf6
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|
2537 args1->obj_at_put(i-1, args->obj_at(i)); |
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|
2538 info = Handle(THREAD, args1); |
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|
2539 } |
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|
2540 } |
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|
2541 guarantee(java_lang_invoke_MethodHandle::is_instance(bsm()), |
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083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
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1602
diff
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|
2542 "caller must supply a valid BSM"); |
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diff
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|
2543 |
6266
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|
2544 Handle method_name = java_lang_String::create_from_symbol(name, CHECK_(empty)); |
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2545 Handle method_type = find_method_handle_type(type, caller, CHECK_(empty)); |
1d7922586cf6
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|
2546 |
12970
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|
2547 // This should not happen. JDK code should take care of that. |
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diff
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|
2548 if (caller.is_null() || method_type.is_null()) { |
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|
2549 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad invokedynamic", empty); |
1c90f0072f0d
8026502: java/lang/invoke/MethodHandleConstants.java fails on all platforms
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12837
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|
2550 } |
1c90f0072f0d
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|
2551 |
6266
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|
2552 objArrayHandle appendix_box = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1, CHECK_(empty)); |
1d7922586cf6
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|
2553 assert(appendix_box->obj_at(0) == NULL, ""); |
1d7922586cf6
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|
2554 |
1d7922586cf6
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|
2555 // call java.lang.invoke.MethodHandleNatives::linkCallSite(caller, bsm, name, mtype, info, &appendix) |
1d7922586cf6
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|
2556 JavaCallArguments args; |
1d7922586cf6
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|
2557 args.push_oop(caller->java_mirror()); |
1d7922586cf6
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6217
diff
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|
2558 args.push_oop(bsm()); |
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|
2559 args.push_oop(method_name()); |
1d7922586cf6
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6217
diff
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|
2560 args.push_oop(method_type()); |
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
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1339
diff
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|
2561 args.push_oop(info()); |
6266
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diff
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|
2562 args.push_oop(appendix_box); |
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6655646: dynamic languages need dynamically linked call sites
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|
2563 JavaValue result(T_OBJECT); |
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|
2564 JavaCalls::call_static(&result, |
1507
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6939134: JSR 292 adjustments to method handle invocation
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diff
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|
2565 SystemDictionary::MethodHandleNatives_klass(), |
6266
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|
2566 vmSymbols::linkCallSite_name(), |
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|
2567 vmSymbols::linkCallSite_signature(), |
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|
2568 &args, CHECK_(empty)); |
6266
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|
2569 Handle mname(THREAD, (oop) result.get_jobject()); |
6822
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|
2570 (*method_type_result) = method_type; |
7185
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6983
diff
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|
2571 return unpack_method_and_appendix(mname, caller, appendix_box, appendix_result, THREAD); |
726
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|
2572 } |
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|
2573 |
0 | 2574 // Since the identity hash code for symbols changes when the symbols are |
2575 // moved from the regular perm gen (hash in the mark word) to the shared | |
2576 // spaces (hash is the address), the classes loaded into the dictionary | |
2577 // may be in the wrong buckets. | |
2578 | |
2579 void SystemDictionary::reorder_dictionary() { | |
2580 dictionary()->reorder_dictionary(); | |
2581 } | |
2582 | |
2583 | |
2584 void SystemDictionary::copy_buckets(char** top, char* end) { | |
2585 dictionary()->copy_buckets(top, end); | |
2586 } | |
2587 | |
2588 | |
2589 void SystemDictionary::copy_table(char** top, char* end) { | |
2590 dictionary()->copy_table(top, end); | |
2591 } | |
2592 | |
2593 | |
2594 void SystemDictionary::reverse() { | |
2595 dictionary()->reverse(); | |
2596 } | |
2597 | |
2598 int SystemDictionary::number_of_classes() { | |
2599 return dictionary()->number_of_entries(); | |
2600 } | |
2601 | |
2602 | |
2603 // ---------------------------------------------------------------------------- | |
2604 #ifndef PRODUCT | |
2605 | |
2606 void SystemDictionary::print() { | |
2607 dictionary()->print(); | |
2608 | |
2609 // Placeholders | |
2610 GCMutexLocker mu(SystemDictionary_lock); | |
2611 placeholders()->print(); | |
2612 | |
2613 // loader constraints - print under SD_lock | |
2614 constraints()->print(); | |
2615 } | |
2616 | |
2617 #endif | |
2618 | |
2619 void SystemDictionary::verify() { | |
2620 guarantee(dictionary() != NULL, "Verify of system dictionary failed"); | |
2621 guarantee(constraints() != NULL, | |
2622 "Verify of loader constraints failed"); | |
2623 guarantee(dictionary()->number_of_entries() >= 0 && | |
2624 placeholders()->number_of_entries() >= 0, | |
2625 "Verify of system dictionary failed"); | |
2626 | |
2627 // Verify dictionary | |
2628 dictionary()->verify(); | |
2629 | |
2630 GCMutexLocker mu(SystemDictionary_lock); | |
2631 placeholders()->verify(); | |
2632 | |
2633 // Verify constraint table | |
2634 guarantee(constraints() != NULL, "Verify of loader constraints failed"); | |
1258
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6920977: G1: guarantee(k == probe->klass(),"klass should be in dictionary") fails
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1142
diff
changeset
|
2635 constraints()->verify(dictionary(), placeholders()); |
0 | 2636 } |
2637 | |
10405 | 2638 // utility function for class load event |
13400
86e6d691f2e1
8028128: Add a type safe alternative for working with counter based data
mgronlun
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12970
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2639 void SystemDictionary::post_class_load_event(const Ticks& start_time, |
10405 | 2640 instanceKlassHandle k, |
2641 Handle initiating_loader) { | |
2642 #if INCLUDE_TRACE | |
2643 EventClassLoad event(UNTIMED); | |
2644 if (event.should_commit()) { | |
2645 event.set_starttime(start_time); | |
2646 event.set_loadedClass(k()); | |
2647 oop defining_class_loader = k->class_loader(); | |
2648 event.set_definingClassLoader(defining_class_loader != NULL ? | |
2649 defining_class_loader->klass() : (Klass*)NULL); | |
2650 oop class_loader = initiating_loader.is_null() ? (oop)NULL : initiating_loader(); | |
2651 event.set_initiatingClassLoader(class_loader != NULL ? | |
2652 class_loader->klass() : (Klass*)NULL); | |
2653 event.commit(); | |
2654 } | |
2655 #endif /* INCLUDE_TRACE */ | |
2656 } | |
2657 | |
0 | 2658 #ifndef PRODUCT |
2659 | |
2660 // statistics code | |
2661 class ClassStatistics: AllStatic { | |
2662 private: | |
2663 static int nclasses; // number of classes | |
2664 static int nmethods; // number of methods | |
2665 static int nmethoddata; // number of methodData | |
2666 static int class_size; // size of class objects in words | |
2667 static int method_size; // size of method objects in words | |
2668 static int debug_size; // size of debug info in methods | |
2669 static int methoddata_size; // size of methodData objects in words | |
2670 | |
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2671 static void do_class(Klass* k) { |
0 | 2672 nclasses++; |
2673 class_size += k->size(); | |
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2674 if (k->oop_is_instance()) { |
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|
2675 InstanceKlass* ik = (InstanceKlass*)k; |
0 | 2676 class_size += ik->methods()->size(); |
2677 class_size += ik->constants()->size(); | |
2678 class_size += ik->local_interfaces()->size(); | |
2679 class_size += ik->transitive_interfaces()->size(); | |
2680 // We do not have to count implementors, since we only store one! | |
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2681 // SSS: How should these be accounted now that they have moved? |
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2682 // class_size += ik->fields()->length(); |
0 | 2683 } |
2684 } | |
2685 | |
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2686 static void do_method(Method* m) { |
0 | 2687 nmethods++; |
2688 method_size += m->size(); | |
2689 // class loader uses same objArray for empty vectors, so don't count these | |
2690 if (m->has_stackmap_table()) { | |
2691 method_size += m->stackmap_data()->size(); | |
2692 } | |
2693 | |
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2694 MethodData* mdo = m->method_data(); |
0 | 2695 if (mdo != NULL) { |
2696 nmethoddata++; | |
2697 methoddata_size += mdo->size(); | |
2698 } | |
2699 } | |
2700 | |
2701 public: | |
2702 static void print() { | |
2703 SystemDictionary::classes_do(do_class); | |
2704 SystemDictionary::methods_do(do_method); | |
2705 tty->print_cr("Class statistics:"); | |
2706 tty->print_cr("%d classes (%d bytes)", nclasses, class_size * oopSize); | |
2707 tty->print_cr("%d methods (%d bytes = %d base + %d debug info)", nmethods, | |
2708 (method_size + debug_size) * oopSize, method_size * oopSize, debug_size * oopSize); | |
2709 tty->print_cr("%d methoddata (%d bytes)", nmethoddata, methoddata_size * oopSize); | |
2710 } | |
2711 }; | |
2712 | |
2713 | |
2714 int ClassStatistics::nclasses = 0; | |
2715 int ClassStatistics::nmethods = 0; | |
2716 int ClassStatistics::nmethoddata = 0; | |
2717 int ClassStatistics::class_size = 0; | |
2718 int ClassStatistics::method_size = 0; | |
2719 int ClassStatistics::debug_size = 0; | |
2720 int ClassStatistics::methoddata_size = 0; | |
2721 | |
2722 void SystemDictionary::print_class_statistics() { | |
2723 ResourceMark rm; | |
2724 ClassStatistics::print(); | |
2725 } | |
2726 | |
2727 | |
2728 class MethodStatistics: AllStatic { | |
2729 public: | |
2730 enum { | |
2731 max_parameter_size = 10 | |
2732 }; | |
2733 private: | |
2734 | |
2735 static int _number_of_methods; | |
2736 static int _number_of_final_methods; | |
2737 static int _number_of_static_methods; | |
2738 static int _number_of_native_methods; | |
2739 static int _number_of_synchronized_methods; | |
2740 static int _number_of_profiled_methods; | |
2741 static int _number_of_bytecodes; | |
2742 static int _parameter_size_profile[max_parameter_size]; | |
2743 static int _bytecodes_profile[Bytecodes::number_of_java_codes]; | |
2744 | |
2745 static void initialize() { | |
2746 _number_of_methods = 0; | |
2747 _number_of_final_methods = 0; | |
2748 _number_of_static_methods = 0; | |
2749 _number_of_native_methods = 0; | |
2750 _number_of_synchronized_methods = 0; | |
2751 _number_of_profiled_methods = 0; | |
2752 _number_of_bytecodes = 0; | |
2753 for (int i = 0; i < max_parameter_size ; i++) _parameter_size_profile[i] = 0; | |
2754 for (int j = 0; j < Bytecodes::number_of_java_codes; j++) _bytecodes_profile [j] = 0; | |
2755 }; | |
2756 | |
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2757 static void do_method(Method* m) { |
0 | 2758 _number_of_methods++; |
2759 // collect flag info | |
2760 if (m->is_final() ) _number_of_final_methods++; | |
2761 if (m->is_static() ) _number_of_static_methods++; | |
2762 if (m->is_native() ) _number_of_native_methods++; | |
2763 if (m->is_synchronized()) _number_of_synchronized_methods++; | |
2764 if (m->method_data() != NULL) _number_of_profiled_methods++; | |
2765 // collect parameter size info (add one for receiver, if any) | |
2766 _parameter_size_profile[MIN2(m->size_of_parameters() + (m->is_static() ? 0 : 1), max_parameter_size - 1)]++; | |
2767 // collect bytecodes info | |
2768 { | |
2769 Thread *thread = Thread::current(); | |
2770 HandleMark hm(thread); | |
2771 BytecodeStream s(methodHandle(thread, m)); | |
2772 Bytecodes::Code c; | |
2773 while ((c = s.next()) >= 0) { | |
2774 _number_of_bytecodes++; | |
2775 _bytecodes_profile[c]++; | |
2776 } | |
2777 } | |
2778 } | |
2779 | |
2780 public: | |
2781 static void print() { | |
2782 initialize(); | |
2783 SystemDictionary::methods_do(do_method); | |
2784 // generate output | |
2785 tty->cr(); | |
2786 tty->print_cr("Method statistics (static):"); | |
2787 // flag distribution | |
2788 tty->cr(); | |
2789 tty->print_cr("%6d final methods %6.1f%%", _number_of_final_methods , _number_of_final_methods * 100.0F / _number_of_methods); | |
2790 tty->print_cr("%6d static methods %6.1f%%", _number_of_static_methods , _number_of_static_methods * 100.0F / _number_of_methods); | |
2791 tty->print_cr("%6d native methods %6.1f%%", _number_of_native_methods , _number_of_native_methods * 100.0F / _number_of_methods); | |
2792 tty->print_cr("%6d synchronized methods %6.1f%%", _number_of_synchronized_methods, _number_of_synchronized_methods * 100.0F / _number_of_methods); | |
2793 tty->print_cr("%6d profiled methods %6.1f%%", _number_of_profiled_methods, _number_of_profiled_methods * 100.0F / _number_of_methods); | |
2794 // parameter size profile | |
2795 tty->cr(); | |
2796 { int tot = 0; | |
2797 int avg = 0; | |
2798 for (int i = 0; i < max_parameter_size; i++) { | |
2799 int n = _parameter_size_profile[i]; | |
2800 tot += n; | |
2801 avg += n*i; | |
2802 tty->print_cr("parameter size = %1d: %6d methods %5.1f%%", i, n, n * 100.0F / _number_of_methods); | |
2803 } | |
2804 assert(tot == _number_of_methods, "should be the same"); | |
2805 tty->print_cr(" %6d methods 100.0%%", _number_of_methods); | |
2806 tty->print_cr("(average parameter size = %3.1f including receiver, if any)", (float)avg / _number_of_methods); | |
2807 } | |
2808 // bytecodes profile | |
2809 tty->cr(); | |
2810 { int tot = 0; | |
2811 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) { | |
2812 if (Bytecodes::is_defined(i)) { | |
2813 Bytecodes::Code c = Bytecodes::cast(i); | |
2814 int n = _bytecodes_profile[c]; | |
2815 tot += n; | |
2816 tty->print_cr("%9d %7.3f%% %s", n, n * 100.0F / _number_of_bytecodes, Bytecodes::name(c)); | |
2817 } | |
2818 } | |
2819 assert(tot == _number_of_bytecodes, "should be the same"); | |
2820 tty->print_cr("%9d 100.000%%", _number_of_bytecodes); | |
2821 } | |
2822 tty->cr(); | |
2823 } | |
2824 }; | |
2825 | |
2826 int MethodStatistics::_number_of_methods; | |
2827 int MethodStatistics::_number_of_final_methods; | |
2828 int MethodStatistics::_number_of_static_methods; | |
2829 int MethodStatistics::_number_of_native_methods; | |
2830 int MethodStatistics::_number_of_synchronized_methods; | |
2831 int MethodStatistics::_number_of_profiled_methods; | |
2832 int MethodStatistics::_number_of_bytecodes; | |
2833 int MethodStatistics::_parameter_size_profile[MethodStatistics::max_parameter_size]; | |
2834 int MethodStatistics::_bytecodes_profile[Bytecodes::number_of_java_codes]; | |
2835 | |
2836 | |
2837 void SystemDictionary::print_method_statistics() { | |
2838 MethodStatistics::print(); | |
2839 } | |
2840 | |
2841 #endif // PRODUCT |