Mercurial > hg > graal-compiler
annotate src/share/vm/oops/instanceKlass.cpp @ 875:6a93908f268f
6857194: Add hotspot perf counters to aid class loading performance measurement
Summary: Add new jvmstat counters to measure detailed class loading time
Reviewed-by: acorn, kamg
| author | mchung |
|---|---|
| date | Fri, 10 Jul 2009 11:10:00 -0700 |
| parents | d3676b4cb78c |
| children | 1413494da700 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_instanceKlass.cpp.incl" | |
| 27 | |
| 28 bool instanceKlass::should_be_initialized() const { | |
| 29 return !is_initialized(); | |
| 30 } | |
| 31 | |
| 32 klassVtable* instanceKlass::vtable() const { | |
| 33 return new klassVtable(as_klassOop(), start_of_vtable(), vtable_length() / vtableEntry::size()); | |
| 34 } | |
| 35 | |
| 36 klassItable* instanceKlass::itable() const { | |
| 37 return new klassItable(as_klassOop()); | |
| 38 } | |
| 39 | |
| 40 void instanceKlass::eager_initialize(Thread *thread) { | |
| 41 if (!EagerInitialization) return; | |
| 42 | |
| 43 if (this->is_not_initialized()) { | |
| 44 // abort if the the class has a class initializer | |
| 45 if (this->class_initializer() != NULL) return; | |
| 46 | |
| 47 // abort if it is java.lang.Object (initialization is handled in genesis) | |
| 48 klassOop super = this->super(); | |
| 49 if (super == NULL) return; | |
| 50 | |
| 51 // abort if the super class should be initialized | |
| 52 if (!instanceKlass::cast(super)->is_initialized()) return; | |
| 53 | |
| 54 // call body to expose the this pointer | |
| 55 instanceKlassHandle this_oop(thread, this->as_klassOop()); | |
| 56 eager_initialize_impl(this_oop); | |
| 57 } | |
| 58 } | |
| 59 | |
| 60 | |
| 61 void instanceKlass::eager_initialize_impl(instanceKlassHandle this_oop) { | |
| 62 EXCEPTION_MARK; | |
| 63 ObjectLocker ol(this_oop, THREAD); | |
| 64 | |
| 65 // abort if someone beat us to the initialization | |
| 66 if (!this_oop->is_not_initialized()) return; // note: not equivalent to is_initialized() | |
| 67 | |
| 68 ClassState old_state = this_oop->_init_state; | |
| 69 link_class_impl(this_oop, true, THREAD); | |
| 70 if (HAS_PENDING_EXCEPTION) { | |
| 71 CLEAR_PENDING_EXCEPTION; | |
| 72 // Abort if linking the class throws an exception. | |
| 73 | |
| 74 // Use a test to avoid redundantly resetting the state if there's | |
| 75 // no change. Set_init_state() asserts that state changes make | |
| 76 // progress, whereas here we might just be spinning in place. | |
| 77 if( old_state != this_oop->_init_state ) | |
| 78 this_oop->set_init_state (old_state); | |
| 79 } else { | |
| 80 // linking successfull, mark class as initialized | |
| 81 this_oop->set_init_state (fully_initialized); | |
| 82 // trace | |
| 83 if (TraceClassInitialization) { | |
| 84 ResourceMark rm(THREAD); | |
| 85 tty->print_cr("[Initialized %s without side effects]", this_oop->external_name()); | |
| 86 } | |
| 87 } | |
| 88 } | |
| 89 | |
| 90 | |
| 91 // See "The Virtual Machine Specification" section 2.16.5 for a detailed explanation of the class initialization | |
| 92 // process. The step comments refers to the procedure described in that section. | |
| 93 // Note: implementation moved to static method to expose the this pointer. | |
| 94 void instanceKlass::initialize(TRAPS) { | |
| 95 if (this->should_be_initialized()) { | |
| 96 HandleMark hm(THREAD); | |
| 97 instanceKlassHandle this_oop(THREAD, this->as_klassOop()); | |
| 98 initialize_impl(this_oop, CHECK); | |
| 99 // Note: at this point the class may be initialized | |
| 100 // OR it may be in the state of being initialized | |
| 101 // in case of recursive initialization! | |
| 102 } else { | |
| 103 assert(is_initialized(), "sanity check"); | |
| 104 } | |
| 105 } | |
| 106 | |
| 107 | |
| 108 bool instanceKlass::verify_code( | |
| 109 instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS) { | |
| 110 // 1) Verify the bytecodes | |
| 111 Verifier::Mode mode = | |
| 112 throw_verifyerror ? Verifier::ThrowException : Verifier::NoException; | |
| 113 return Verifier::verify(this_oop, mode, CHECK_false); | |
| 114 } | |
| 115 | |
| 116 | |
| 117 // Used exclusively by the shared spaces dump mechanism to prevent | |
| 118 // classes mapped into the shared regions in new VMs from appearing linked. | |
| 119 | |
| 120 void instanceKlass::unlink_class() { | |
| 121 assert(is_linked(), "must be linked"); | |
| 122 _init_state = loaded; | |
| 123 } | |
| 124 | |
| 125 void instanceKlass::link_class(TRAPS) { | |
| 126 assert(is_loaded(), "must be loaded"); | |
| 127 if (!is_linked()) { | |
| 128 instanceKlassHandle this_oop(THREAD, this->as_klassOop()); | |
| 129 link_class_impl(this_oop, true, CHECK); | |
| 130 } | |
| 131 } | |
| 132 | |
| 133 // Called to verify that a class can link during initialization, without | |
| 134 // throwing a VerifyError. | |
| 135 bool instanceKlass::link_class_or_fail(TRAPS) { | |
| 136 assert(is_loaded(), "must be loaded"); | |
| 137 if (!is_linked()) { | |
| 138 instanceKlassHandle this_oop(THREAD, this->as_klassOop()); | |
| 139 link_class_impl(this_oop, false, CHECK_false); | |
| 140 } | |
| 141 return is_linked(); | |
| 142 } | |
| 143 | |
| 144 bool instanceKlass::link_class_impl( | |
| 145 instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS) { | |
| 146 // check for error state | |
| 147 if (this_oop->is_in_error_state()) { | |
| 148 ResourceMark rm(THREAD); | |
| 149 THROW_MSG_(vmSymbols::java_lang_NoClassDefFoundError(), | |
| 150 this_oop->external_name(), false); | |
| 151 } | |
| 152 // return if already verified | |
| 153 if (this_oop->is_linked()) { | |
| 154 return true; | |
| 155 } | |
| 156 | |
| 157 // Timing | |
| 158 // timer handles recursion | |
| 159 assert(THREAD->is_Java_thread(), "non-JavaThread in link_class_impl"); | |
| 160 JavaThread* jt = (JavaThread*)THREAD; | |
| 161 | |
| 162 // link super class before linking this class | |
| 163 instanceKlassHandle super(THREAD, this_oop->super()); | |
| 164 if (super.not_null()) { | |
| 165 if (super->is_interface()) { // check if super class is an interface | |
| 166 ResourceMark rm(THREAD); | |
| 167 Exceptions::fthrow( | |
| 168 THREAD_AND_LOCATION, | |
| 169 vmSymbolHandles::java_lang_IncompatibleClassChangeError(), | |
| 170 "class %s has interface %s as super class", | |
| 171 this_oop->external_name(), | |
| 172 super->external_name() | |
| 173 ); | |
| 174 return false; | |
| 175 } | |
| 176 | |
| 177 link_class_impl(super, throw_verifyerror, CHECK_false); | |
| 178 } | |
| 179 | |
| 180 // link all interfaces implemented by this class before linking this class | |
| 181 objArrayHandle interfaces (THREAD, this_oop->local_interfaces()); | |
| 182 int num_interfaces = interfaces->length(); | |
| 183 for (int index = 0; index < num_interfaces; index++) { | |
| 184 HandleMark hm(THREAD); | |
| 185 instanceKlassHandle ih(THREAD, klassOop(interfaces->obj_at(index))); | |
| 186 link_class_impl(ih, throw_verifyerror, CHECK_false); | |
| 187 } | |
| 188 | |
| 189 // in case the class is linked in the process of linking its superclasses | |
| 190 if (this_oop->is_linked()) { | |
| 191 return true; | |
| 192 } | |
| 193 | |
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194 // trace only the link time for this klass that includes |
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195 // the verification time |
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196 PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(), |
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197 ClassLoader::perf_class_link_selftime(), |
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198 ClassLoader::perf_classes_linked(), |
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199 jt->get_thread_stat()->perf_recursion_counts_addr(), |
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200 jt->get_thread_stat()->perf_timers_addr(), |
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201 PerfClassTraceTime::CLASS_LINK); |
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202 |
| 0 | 203 // verification & rewriting |
| 204 { | |
| 205 ObjectLocker ol(this_oop, THREAD); | |
| 206 // rewritten will have been set if loader constraint error found | |
| 207 // on an earlier link attempt | |
| 208 // don't verify or rewrite if already rewritten | |
| 209 if (!this_oop->is_linked()) { | |
| 210 if (!this_oop->is_rewritten()) { | |
| 211 { | |
| 212 // Timer includes any side effects of class verification (resolution, | |
| 213 // etc), but not recursive entry into verify_code(). | |
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214 PerfClassTraceTime timer(ClassLoader::perf_class_verify_time(), |
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215 ClassLoader::perf_class_verify_selftime(), |
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216 ClassLoader::perf_classes_verified(), |
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217 jt->get_thread_stat()->perf_recursion_counts_addr(), |
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218 jt->get_thread_stat()->perf_timers_addr(), |
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219 PerfClassTraceTime::CLASS_VERIFY); |
| 0 | 220 bool verify_ok = verify_code(this_oop, throw_verifyerror, THREAD); |
| 221 if (!verify_ok) { | |
| 222 return false; | |
| 223 } | |
| 224 } | |
| 225 | |
| 226 // Just in case a side-effect of verify linked this class already | |
| 227 // (which can sometimes happen since the verifier loads classes | |
| 228 // using custom class loaders, which are free to initialize things) | |
| 229 if (this_oop->is_linked()) { | |
| 230 return true; | |
| 231 } | |
| 232 | |
| 233 // also sets rewritten | |
| 234 this_oop->rewrite_class(CHECK_false); | |
| 235 } | |
| 236 | |
| 237 // Initialize the vtable and interface table after | |
| 238 // methods have been rewritten since rewrite may | |
| 239 // fabricate new methodOops. | |
| 240 // also does loader constraint checking | |
| 241 if (!this_oop()->is_shared()) { | |
| 242 ResourceMark rm(THREAD); | |
| 243 this_oop->vtable()->initialize_vtable(true, CHECK_false); | |
| 244 this_oop->itable()->initialize_itable(true, CHECK_false); | |
| 245 } | |
| 246 #ifdef ASSERT | |
| 247 else { | |
| 248 ResourceMark rm(THREAD); | |
| 249 this_oop->vtable()->verify(tty, true); | |
| 250 // In case itable verification is ever added. | |
| 251 // this_oop->itable()->verify(tty, true); | |
| 252 } | |
| 253 #endif | |
| 254 this_oop->set_init_state(linked); | |
| 255 if (JvmtiExport::should_post_class_prepare()) { | |
| 256 Thread *thread = THREAD; | |
| 257 assert(thread->is_Java_thread(), "thread->is_Java_thread()"); | |
| 258 JvmtiExport::post_class_prepare((JavaThread *) thread, this_oop()); | |
| 259 } | |
| 260 } | |
| 261 } | |
| 262 return true; | |
| 263 } | |
| 264 | |
| 265 | |
| 266 // Rewrite the byte codes of all of the methods of a class. | |
| 267 // Three cases: | |
| 268 // During the link of a newly loaded class. | |
| 269 // During the preloading of classes to be written to the shared spaces. | |
| 270 // - Rewrite the methods and update the method entry points. | |
| 271 // | |
| 272 // During the link of a class in the shared spaces. | |
| 273 // - The methods were already rewritten, update the metho entry points. | |
| 274 // | |
| 275 // The rewriter must be called exactly once. Rewriting must happen after | |
| 276 // verification but before the first method of the class is executed. | |
| 277 | |
| 278 void instanceKlass::rewrite_class(TRAPS) { | |
| 279 assert(is_loaded(), "must be loaded"); | |
| 280 instanceKlassHandle this_oop(THREAD, this->as_klassOop()); | |
| 281 if (this_oop->is_rewritten()) { | |
| 282 assert(this_oop()->is_shared(), "rewriting an unshared class?"); | |
| 283 return; | |
| 284 } | |
| 285 Rewriter::rewrite(this_oop, CHECK); // No exception can happen here | |
| 286 this_oop->set_rewritten(); | |
| 287 } | |
| 288 | |
| 289 | |
| 290 void instanceKlass::initialize_impl(instanceKlassHandle this_oop, TRAPS) { | |
| 291 // Make sure klass is linked (verified) before initialization | |
| 292 // A class could already be verified, since it has been reflected upon. | |
| 293 this_oop->link_class(CHECK); | |
| 294 | |
| 295 // refer to the JVM book page 47 for description of steps | |
| 296 // Step 1 | |
| 297 { ObjectLocker ol(this_oop, THREAD); | |
| 298 | |
| 299 Thread *self = THREAD; // it's passed the current thread | |
| 300 | |
| 301 // Step 2 | |
| 302 // If we were to use wait() instead of waitInterruptibly() then | |
| 303 // we might end up throwing IE from link/symbol resolution sites | |
| 304 // that aren't expected to throw. This would wreak havoc. See 6320309. | |
| 305 while(this_oop->is_being_initialized() && !this_oop->is_reentrant_initialization(self)) { | |
| 306 ol.waitUninterruptibly(CHECK); | |
| 307 } | |
| 308 | |
| 309 // Step 3 | |
| 310 if (this_oop->is_being_initialized() && this_oop->is_reentrant_initialization(self)) | |
| 311 return; | |
| 312 | |
| 313 // Step 4 | |
| 314 if (this_oop->is_initialized()) | |
| 315 return; | |
| 316 | |
| 317 // Step 5 | |
| 318 if (this_oop->is_in_error_state()) { | |
| 319 ResourceMark rm(THREAD); | |
| 320 const char* desc = "Could not initialize class "; | |
| 321 const char* className = this_oop->external_name(); | |
| 322 size_t msglen = strlen(desc) + strlen(className) + 1; | |
| 323 char* message = NEW_C_HEAP_ARRAY(char, msglen); | |
| 324 if (NULL == message) { | |
| 325 // Out of memory: can't create detailed error message | |
| 326 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), className); | |
| 327 } else { | |
| 328 jio_snprintf(message, msglen, "%s%s", desc, className); | |
| 329 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), message); | |
| 330 } | |
| 331 } | |
| 332 | |
| 333 // Step 6 | |
| 334 this_oop->set_init_state(being_initialized); | |
| 335 this_oop->set_init_thread(self); | |
| 336 } | |
| 337 | |
| 338 // Step 7 | |
| 339 klassOop super_klass = this_oop->super(); | |
| 340 if (super_klass != NULL && !this_oop->is_interface() && Klass::cast(super_klass)->should_be_initialized()) { | |
| 341 Klass::cast(super_klass)->initialize(THREAD); | |
| 342 | |
| 343 if (HAS_PENDING_EXCEPTION) { | |
| 344 Handle e(THREAD, PENDING_EXCEPTION); | |
| 345 CLEAR_PENDING_EXCEPTION; | |
| 346 { | |
| 347 EXCEPTION_MARK; | |
| 348 this_oop->set_initialization_state_and_notify(initialization_error, THREAD); // Locks object, set state, and notify all waiting threads | |
| 349 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, superclass initialization error is thrown below | |
| 350 } | |
| 351 THROW_OOP(e()); | |
| 352 } | |
| 353 } | |
| 354 | |
| 355 // Step 8 | |
| 356 { | |
| 357 assert(THREAD->is_Java_thread(), "non-JavaThread in initialize_impl"); | |
| 358 JavaThread* jt = (JavaThread*)THREAD; | |
| 359 // Timer includes any side effects of class initialization (resolution, | |
| 360 // etc), but not recursive entry into call_class_initializer(). | |
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361 PerfClassTraceTime timer(ClassLoader::perf_class_init_time(), |
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362 ClassLoader::perf_class_init_selftime(), |
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363 ClassLoader::perf_classes_inited(), |
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364 jt->get_thread_stat()->perf_recursion_counts_addr(), |
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365 jt->get_thread_stat()->perf_timers_addr(), |
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366 PerfClassTraceTime::CLASS_CLINIT); |
| 0 | 367 this_oop->call_class_initializer(THREAD); |
| 368 } | |
| 369 | |
| 370 // Step 9 | |
| 371 if (!HAS_PENDING_EXCEPTION) { | |
| 372 this_oop->set_initialization_state_and_notify(fully_initialized, CHECK); | |
| 373 { ResourceMark rm(THREAD); | |
| 374 debug_only(this_oop->vtable()->verify(tty, true);) | |
| 375 } | |
| 376 } | |
| 377 else { | |
| 378 // Step 10 and 11 | |
| 379 Handle e(THREAD, PENDING_EXCEPTION); | |
| 380 CLEAR_PENDING_EXCEPTION; | |
| 381 { | |
| 382 EXCEPTION_MARK; | |
| 383 this_oop->set_initialization_state_and_notify(initialization_error, THREAD); | |
| 384 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, class initialization error is thrown below | |
| 385 } | |
| 386 if (e->is_a(SystemDictionary::error_klass())) { | |
| 387 THROW_OOP(e()); | |
| 388 } else { | |
| 389 JavaCallArguments args(e); | |
| 390 THROW_ARG(vmSymbolHandles::java_lang_ExceptionInInitializerError(), | |
| 391 vmSymbolHandles::throwable_void_signature(), | |
| 392 &args); | |
| 393 } | |
| 394 } | |
| 395 } | |
| 396 | |
| 397 | |
| 398 // Note: implementation moved to static method to expose the this pointer. | |
| 399 void instanceKlass::set_initialization_state_and_notify(ClassState state, TRAPS) { | |
| 400 instanceKlassHandle kh(THREAD, this->as_klassOop()); | |
| 401 set_initialization_state_and_notify_impl(kh, state, CHECK); | |
| 402 } | |
| 403 | |
| 404 void instanceKlass::set_initialization_state_and_notify_impl(instanceKlassHandle this_oop, ClassState state, TRAPS) { | |
| 405 ObjectLocker ol(this_oop, THREAD); | |
| 406 this_oop->set_init_state(state); | |
| 407 ol.notify_all(CHECK); | |
| 408 } | |
| 409 | |
| 410 void instanceKlass::add_implementor(klassOop k) { | |
| 411 assert(Compile_lock->owned_by_self(), ""); | |
| 412 // Filter out my subinterfaces. | |
| 413 // (Note: Interfaces are never on the subklass list.) | |
| 414 if (instanceKlass::cast(k)->is_interface()) return; | |
| 415 | |
| 416 // Filter out subclasses whose supers already implement me. | |
| 417 // (Note: CHA must walk subclasses of direct implementors | |
| 418 // in order to locate indirect implementors.) | |
| 419 klassOop sk = instanceKlass::cast(k)->super(); | |
| 420 if (sk != NULL && instanceKlass::cast(sk)->implements_interface(as_klassOop())) | |
| 421 // We only need to check one immediate superclass, since the | |
| 422 // implements_interface query looks at transitive_interfaces. | |
| 423 // Any supers of the super have the same (or fewer) transitive_interfaces. | |
| 424 return; | |
| 425 | |
| 426 // Update number of implementors | |
| 427 int i = _nof_implementors++; | |
| 428 | |
| 429 // Record this implementor, if there are not too many already | |
| 430 if (i < implementors_limit) { | |
| 431 assert(_implementors[i] == NULL, "should be exactly one implementor"); | |
| 432 oop_store_without_check((oop*)&_implementors[i], k); | |
| 433 } else if (i == implementors_limit) { | |
| 434 // clear out the list on first overflow | |
| 435 for (int i2 = 0; i2 < implementors_limit; i2++) | |
| 436 oop_store_without_check((oop*)&_implementors[i2], NULL); | |
| 437 } | |
| 438 | |
| 439 // The implementor also implements the transitive_interfaces | |
| 440 for (int index = 0; index < local_interfaces()->length(); index++) { | |
| 441 instanceKlass::cast(klassOop(local_interfaces()->obj_at(index)))->add_implementor(k); | |
| 442 } | |
| 443 } | |
| 444 | |
| 445 void instanceKlass::init_implementor() { | |
| 446 for (int i = 0; i < implementors_limit; i++) | |
| 447 oop_store_without_check((oop*)&_implementors[i], NULL); | |
| 448 _nof_implementors = 0; | |
| 449 } | |
| 450 | |
| 451 | |
| 452 void instanceKlass::process_interfaces(Thread *thread) { | |
| 453 // link this class into the implementors list of every interface it implements | |
| 454 KlassHandle this_as_oop (thread, this->as_klassOop()); | |
| 455 for (int i = local_interfaces()->length() - 1; i >= 0; i--) { | |
| 456 assert(local_interfaces()->obj_at(i)->is_klass(), "must be a klass"); | |
| 457 instanceKlass* interf = instanceKlass::cast(klassOop(local_interfaces()->obj_at(i))); | |
| 458 assert(interf->is_interface(), "expected interface"); | |
| 459 interf->add_implementor(this_as_oop()); | |
| 460 } | |
| 461 } | |
| 462 | |
| 463 bool instanceKlass::can_be_primary_super_slow() const { | |
| 464 if (is_interface()) | |
| 465 return false; | |
| 466 else | |
| 467 return Klass::can_be_primary_super_slow(); | |
| 468 } | |
| 469 | |
| 470 objArrayOop instanceKlass::compute_secondary_supers(int num_extra_slots, TRAPS) { | |
| 471 // The secondaries are the implemented interfaces. | |
| 472 instanceKlass* ik = instanceKlass::cast(as_klassOop()); | |
| 473 objArrayHandle interfaces (THREAD, ik->transitive_interfaces()); | |
| 474 int num_secondaries = num_extra_slots + interfaces->length(); | |
| 475 if (num_secondaries == 0) { | |
| 476 return Universe::the_empty_system_obj_array(); | |
| 477 } else if (num_extra_slots == 0) { | |
| 478 return interfaces(); | |
| 479 } else { | |
| 480 // a mix of both | |
| 481 objArrayOop secondaries = oopFactory::new_system_objArray(num_secondaries, CHECK_NULL); | |
| 482 for (int i = 0; i < interfaces->length(); i++) { | |
| 483 secondaries->obj_at_put(num_extra_slots+i, interfaces->obj_at(i)); | |
| 484 } | |
| 485 return secondaries; | |
| 486 } | |
| 487 } | |
| 488 | |
| 489 bool instanceKlass::compute_is_subtype_of(klassOop k) { | |
| 490 if (Klass::cast(k)->is_interface()) { | |
| 491 return implements_interface(k); | |
| 492 } else { | |
| 493 return Klass::compute_is_subtype_of(k); | |
| 494 } | |
| 495 } | |
| 496 | |
| 497 bool instanceKlass::implements_interface(klassOop k) const { | |
| 498 if (as_klassOop() == k) return true; | |
| 499 assert(Klass::cast(k)->is_interface(), "should be an interface class"); | |
| 500 for (int i = 0; i < transitive_interfaces()->length(); i++) { | |
| 501 if (transitive_interfaces()->obj_at(i) == k) { | |
| 502 return true; | |
| 503 } | |
| 504 } | |
| 505 return false; | |
| 506 } | |
| 507 | |
| 508 objArrayOop instanceKlass::allocate_objArray(int n, int length, TRAPS) { | |
| 509 if (length < 0) THROW_0(vmSymbols::java_lang_NegativeArraySizeException()); | |
| 510 if (length > arrayOopDesc::max_array_length(T_OBJECT)) { | |
| 511 THROW_OOP_0(Universe::out_of_memory_error_array_size()); | |
| 512 } | |
| 513 int size = objArrayOopDesc::object_size(length); | |
| 514 klassOop ak = array_klass(n, CHECK_NULL); | |
| 515 KlassHandle h_ak (THREAD, ak); | |
| 516 objArrayOop o = | |
| 517 (objArrayOop)CollectedHeap::array_allocate(h_ak, size, length, CHECK_NULL); | |
| 518 return o; | |
| 519 } | |
| 520 | |
| 521 instanceOop instanceKlass::register_finalizer(instanceOop i, TRAPS) { | |
| 522 if (TraceFinalizerRegistration) { | |
| 523 tty->print("Registered "); | |
| 524 i->print_value_on(tty); | |
| 525 tty->print_cr(" (" INTPTR_FORMAT ") as finalizable", (address)i); | |
| 526 } | |
| 527 instanceHandle h_i(THREAD, i); | |
| 528 // Pass the handle as argument, JavaCalls::call expects oop as jobjects | |
| 529 JavaValue result(T_VOID); | |
| 530 JavaCallArguments args(h_i); | |
| 531 methodHandle mh (THREAD, Universe::finalizer_register_method()); | |
| 532 JavaCalls::call(&result, mh, &args, CHECK_NULL); | |
| 533 return h_i(); | |
| 534 } | |
| 535 | |
| 536 instanceOop instanceKlass::allocate_instance(TRAPS) { | |
| 537 bool has_finalizer_flag = has_finalizer(); // Query before possible GC | |
| 538 int size = size_helper(); // Query before forming handle. | |
| 539 | |
| 540 KlassHandle h_k(THREAD, as_klassOop()); | |
| 541 | |
| 542 instanceOop i; | |
| 543 | |
| 544 i = (instanceOop)CollectedHeap::obj_allocate(h_k, size, CHECK_NULL); | |
| 545 if (has_finalizer_flag && !RegisterFinalizersAtInit) { | |
| 546 i = register_finalizer(i, CHECK_NULL); | |
| 547 } | |
| 548 return i; | |
| 549 } | |
| 550 | |
| 551 instanceOop instanceKlass::allocate_permanent_instance(TRAPS) { | |
| 552 // Finalizer registration occurs in the Object.<init> constructor | |
| 553 // and constructors normally aren't run when allocating perm | |
| 554 // instances so simply disallow finalizable perm objects. This can | |
| 555 // be relaxed if a need for it is found. | |
| 556 assert(!has_finalizer(), "perm objects not allowed to have finalizers"); | |
| 557 int size = size_helper(); // Query before forming handle. | |
| 558 KlassHandle h_k(THREAD, as_klassOop()); | |
| 559 instanceOop i = (instanceOop) | |
| 560 CollectedHeap::permanent_obj_allocate(h_k, size, CHECK_NULL); | |
| 561 return i; | |
| 562 } | |
| 563 | |
| 564 void instanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) { | |
| 565 if (is_interface() || is_abstract()) { | |
| 566 ResourceMark rm(THREAD); | |
| 567 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError() | |
| 568 : vmSymbols::java_lang_InstantiationException(), external_name()); | |
| 569 } | |
| 570 if (as_klassOop() == SystemDictionary::class_klass()) { | |
| 571 ResourceMark rm(THREAD); | |
| 572 THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError() | |
| 573 : vmSymbols::java_lang_IllegalAccessException(), external_name()); | |
| 574 } | |
| 575 } | |
| 576 | |
| 577 klassOop instanceKlass::array_klass_impl(bool or_null, int n, TRAPS) { | |
| 578 instanceKlassHandle this_oop(THREAD, as_klassOop()); | |
| 579 return array_klass_impl(this_oop, or_null, n, THREAD); | |
| 580 } | |
| 581 | |
| 582 klassOop instanceKlass::array_klass_impl(instanceKlassHandle this_oop, bool or_null, int n, TRAPS) { | |
| 583 if (this_oop->array_klasses() == NULL) { | |
| 584 if (or_null) return NULL; | |
| 585 | |
| 586 ResourceMark rm; | |
| 587 JavaThread *jt = (JavaThread *)THREAD; | |
| 588 { | |
| 589 // Atomic creation of array_klasses | |
| 590 MutexLocker mc(Compile_lock, THREAD); // for vtables | |
| 591 MutexLocker ma(MultiArray_lock, THREAD); | |
| 592 | |
| 593 // Check if update has already taken place | |
| 594 if (this_oop->array_klasses() == NULL) { | |
| 595 objArrayKlassKlass* oakk = | |
| 596 (objArrayKlassKlass*)Universe::objArrayKlassKlassObj()->klass_part(); | |
| 597 | |
| 598 klassOop k = oakk->allocate_objArray_klass(1, this_oop, CHECK_NULL); | |
| 599 this_oop->set_array_klasses(k); | |
| 600 } | |
| 601 } | |
| 602 } | |
| 603 // _this will always be set at this point | |
| 604 objArrayKlass* oak = (objArrayKlass*)this_oop->array_klasses()->klass_part(); | |
| 605 if (or_null) { | |
| 606 return oak->array_klass_or_null(n); | |
| 607 } | |
| 608 return oak->array_klass(n, CHECK_NULL); | |
| 609 } | |
| 610 | |
| 611 klassOop instanceKlass::array_klass_impl(bool or_null, TRAPS) { | |
| 612 return array_klass_impl(or_null, 1, THREAD); | |
| 613 } | |
| 614 | |
| 615 void instanceKlass::call_class_initializer(TRAPS) { | |
| 616 instanceKlassHandle ik (THREAD, as_klassOop()); | |
| 617 call_class_initializer_impl(ik, THREAD); | |
| 618 } | |
| 619 | |
| 620 static int call_class_initializer_impl_counter = 0; // for debugging | |
| 621 | |
| 622 methodOop instanceKlass::class_initializer() { | |
| 623 return find_method(vmSymbols::class_initializer_name(), vmSymbols::void_method_signature()); | |
| 624 } | |
| 625 | |
| 626 void instanceKlass::call_class_initializer_impl(instanceKlassHandle this_oop, TRAPS) { | |
| 627 methodHandle h_method(THREAD, this_oop->class_initializer()); | |
| 628 assert(!this_oop->is_initialized(), "we cannot initialize twice"); | |
| 629 if (TraceClassInitialization) { | |
| 630 tty->print("%d Initializing ", call_class_initializer_impl_counter++); | |
| 631 this_oop->name()->print_value(); | |
| 632 tty->print_cr("%s (" INTPTR_FORMAT ")", h_method() == NULL ? "(no method)" : "", (address)this_oop()); | |
| 633 } | |
| 634 if (h_method() != NULL) { | |
| 635 JavaCallArguments args; // No arguments | |
| 636 JavaValue result(T_VOID); | |
| 637 JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args) | |
| 638 } | |
| 639 } | |
| 640 | |
| 641 | |
| 642 void instanceKlass::mask_for(methodHandle method, int bci, | |
| 643 InterpreterOopMap* entry_for) { | |
| 644 // Dirty read, then double-check under a lock. | |
| 645 if (_oop_map_cache == NULL) { | |
| 646 // Otherwise, allocate a new one. | |
| 647 MutexLocker x(OopMapCacheAlloc_lock); | |
| 648 // First time use. Allocate a cache in C heap | |
| 649 if (_oop_map_cache == NULL) { | |
| 650 _oop_map_cache = new OopMapCache(); | |
| 651 } | |
| 652 } | |
| 653 // _oop_map_cache is constant after init; lookup below does is own locking. | |
| 654 _oop_map_cache->lookup(method, bci, entry_for); | |
| 655 } | |
| 656 | |
| 657 | |
| 658 bool instanceKlass::find_local_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const { | |
| 659 const int n = fields()->length(); | |
| 660 for (int i = 0; i < n; i += next_offset ) { | |
| 661 int name_index = fields()->ushort_at(i + name_index_offset); | |
| 662 int sig_index = fields()->ushort_at(i + signature_index_offset); | |
| 663 symbolOop f_name = constants()->symbol_at(name_index); | |
| 664 symbolOop f_sig = constants()->symbol_at(sig_index); | |
| 665 if (f_name == name && f_sig == sig) { | |
| 666 fd->initialize(as_klassOop(), i); | |
| 667 return true; | |
| 668 } | |
| 669 } | |
| 670 return false; | |
| 671 } | |
| 672 | |
| 673 | |
| 674 void instanceKlass::field_names_and_sigs_iterate(OopClosure* closure) { | |
| 675 const int n = fields()->length(); | |
| 676 for (int i = 0; i < n; i += next_offset ) { | |
| 677 int name_index = fields()->ushort_at(i + name_index_offset); | |
| 678 symbolOop name = constants()->symbol_at(name_index); | |
| 679 closure->do_oop((oop*)&name); | |
| 680 | |
| 681 int sig_index = fields()->ushort_at(i + signature_index_offset); | |
| 682 symbolOop sig = constants()->symbol_at(sig_index); | |
| 683 closure->do_oop((oop*)&sig); | |
| 684 } | |
| 685 } | |
| 686 | |
| 687 | |
| 688 klassOop instanceKlass::find_interface_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const { | |
| 689 const int n = local_interfaces()->length(); | |
| 690 for (int i = 0; i < n; i++) { | |
| 691 klassOop intf1 = klassOop(local_interfaces()->obj_at(i)); | |
| 692 assert(Klass::cast(intf1)->is_interface(), "just checking type"); | |
| 693 // search for field in current interface | |
| 694 if (instanceKlass::cast(intf1)->find_local_field(name, sig, fd)) { | |
| 695 assert(fd->is_static(), "interface field must be static"); | |
| 696 return intf1; | |
| 697 } | |
| 698 // search for field in direct superinterfaces | |
| 699 klassOop intf2 = instanceKlass::cast(intf1)->find_interface_field(name, sig, fd); | |
| 700 if (intf2 != NULL) return intf2; | |
| 701 } | |
| 702 // otherwise field lookup fails | |
| 703 return NULL; | |
| 704 } | |
| 705 | |
| 706 | |
| 707 klassOop instanceKlass::find_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const { | |
| 708 // search order according to newest JVM spec (5.4.3.2, p.167). | |
| 709 // 1) search for field in current klass | |
| 710 if (find_local_field(name, sig, fd)) { | |
| 711 return as_klassOop(); | |
| 712 } | |
| 713 // 2) search for field recursively in direct superinterfaces | |
| 714 { klassOop intf = find_interface_field(name, sig, fd); | |
| 715 if (intf != NULL) return intf; | |
| 716 } | |
| 717 // 3) apply field lookup recursively if superclass exists | |
| 718 { klassOop supr = super(); | |
| 719 if (supr != NULL) return instanceKlass::cast(supr)->find_field(name, sig, fd); | |
| 720 } | |
| 721 // 4) otherwise field lookup fails | |
| 722 return NULL; | |
| 723 } | |
| 724 | |
| 725 | |
| 726 klassOop instanceKlass::find_field(symbolOop name, symbolOop sig, bool is_static, fieldDescriptor* fd) const { | |
| 727 // search order according to newest JVM spec (5.4.3.2, p.167). | |
| 728 // 1) search for field in current klass | |
| 729 if (find_local_field(name, sig, fd)) { | |
| 730 if (fd->is_static() == is_static) return as_klassOop(); | |
| 731 } | |
| 732 // 2) search for field recursively in direct superinterfaces | |
| 733 if (is_static) { | |
| 734 klassOop intf = find_interface_field(name, sig, fd); | |
| 735 if (intf != NULL) return intf; | |
| 736 } | |
| 737 // 3) apply field lookup recursively if superclass exists | |
| 738 { klassOop supr = super(); | |
| 739 if (supr != NULL) return instanceKlass::cast(supr)->find_field(name, sig, is_static, fd); | |
| 740 } | |
| 741 // 4) otherwise field lookup fails | |
| 742 return NULL; | |
| 743 } | |
| 744 | |
| 745 | |
| 746 bool instanceKlass::find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const { | |
| 747 int length = fields()->length(); | |
| 748 for (int i = 0; i < length; i += next_offset) { | |
| 749 if (offset_from_fields( i ) == offset) { | |
| 750 fd->initialize(as_klassOop(), i); | |
| 751 if (fd->is_static() == is_static) return true; | |
| 752 } | |
| 753 } | |
| 754 return false; | |
| 755 } | |
| 756 | |
| 757 | |
| 758 bool instanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const { | |
| 759 klassOop klass = as_klassOop(); | |
| 760 while (klass != NULL) { | |
| 761 if (instanceKlass::cast(klass)->find_local_field_from_offset(offset, is_static, fd)) { | |
| 762 return true; | |
| 763 } | |
| 764 klass = Klass::cast(klass)->super(); | |
| 765 } | |
| 766 return false; | |
| 767 } | |
| 768 | |
| 769 | |
| 770 void instanceKlass::methods_do(void f(methodOop method)) { | |
| 771 int len = methods()->length(); | |
| 772 for (int index = 0; index < len; index++) { | |
| 773 methodOop m = methodOop(methods()->obj_at(index)); | |
| 774 assert(m->is_method(), "must be method"); | |
| 775 f(m); | |
| 776 } | |
| 777 } | |
| 778 | |
| 779 void instanceKlass::do_local_static_fields(FieldClosure* cl) { | |
| 780 fieldDescriptor fd; | |
| 781 int length = fields()->length(); | |
| 782 for (int i = 0; i < length; i += next_offset) { | |
| 783 fd.initialize(as_klassOop(), i); | |
| 784 if (fd.is_static()) cl->do_field(&fd); | |
| 785 } | |
| 786 } | |
| 787 | |
| 788 | |
| 789 void instanceKlass::do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS) { | |
| 790 instanceKlassHandle h_this(THREAD, as_klassOop()); | |
| 791 do_local_static_fields_impl(h_this, f, CHECK); | |
| 792 } | |
| 793 | |
| 794 | |
| 795 void instanceKlass::do_local_static_fields_impl(instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS) { | |
| 796 fieldDescriptor fd; | |
| 797 int length = this_oop->fields()->length(); | |
| 798 for (int i = 0; i < length; i += next_offset) { | |
| 799 fd.initialize(this_oop(), i); | |
| 800 if (fd.is_static()) { f(&fd, CHECK); } // Do NOT remove {}! (CHECK macro expands into several statements) | |
| 801 } | |
| 802 } | |
| 803 | |
| 804 | |
|
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805 static int compare_fields_by_offset(int* a, int* b) { |
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806 return a[0] - b[0]; |
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807 } |
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808 |
| 0 | 809 void instanceKlass::do_nonstatic_fields(FieldClosure* cl) { |
| 810 instanceKlass* super = superklass(); | |
| 811 if (super != NULL) { | |
| 812 super->do_nonstatic_fields(cl); | |
| 813 } | |
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814 fieldDescriptor fd; |
| 0 | 815 int length = fields()->length(); |
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816 // In DebugInfo nonstatic fields are sorted by offset. |
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817 int* fields_sorted = NEW_C_HEAP_ARRAY(int, 2*(length+1)); |
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818 int j = 0; |
| 0 | 819 for (int i = 0; i < length; i += next_offset) { |
| 820 fd.initialize(as_klassOop(), i); | |
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821 if (!fd.is_static()) { |
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822 fields_sorted[j + 0] = fd.offset(); |
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823 fields_sorted[j + 1] = i; |
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824 j += 2; |
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825 } |
| 0 | 826 } |
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827 if (j > 0) { |
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828 length = j; |
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829 // _sort_Fn is defined in growableArray.hpp. |
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830 qsort(fields_sorted, length/2, 2*sizeof(int), (_sort_Fn)compare_fields_by_offset); |
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831 for (int i = 0; i < length; i += 2) { |
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832 fd.initialize(as_klassOop(), fields_sorted[i + 1]); |
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833 assert(!fd.is_static() && fd.offset() == fields_sorted[i], "only nonstatic fields"); |
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834 cl->do_field(&fd); |
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835 } |
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836 } |
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837 FREE_C_HEAP_ARRAY(int, fields_sorted); |
| 0 | 838 } |
| 839 | |
| 840 | |
| 841 void instanceKlass::array_klasses_do(void f(klassOop k)) { | |
| 842 if (array_klasses() != NULL) | |
| 843 arrayKlass::cast(array_klasses())->array_klasses_do(f); | |
| 844 } | |
| 845 | |
| 846 | |
| 847 void instanceKlass::with_array_klasses_do(void f(klassOop k)) { | |
| 848 f(as_klassOop()); | |
| 849 array_klasses_do(f); | |
| 850 } | |
| 851 | |
| 852 #ifdef ASSERT | |
| 853 static int linear_search(objArrayOop methods, symbolOop name, symbolOop signature) { | |
| 854 int len = methods->length(); | |
| 855 for (int index = 0; index < len; index++) { | |
| 856 methodOop m = (methodOop)(methods->obj_at(index)); | |
| 857 assert(m->is_method(), "must be method"); | |
| 858 if (m->signature() == signature && m->name() == name) { | |
| 859 return index; | |
| 860 } | |
| 861 } | |
| 862 return -1; | |
| 863 } | |
| 864 #endif | |
| 865 | |
| 866 methodOop instanceKlass::find_method(symbolOop name, symbolOop signature) const { | |
| 867 return instanceKlass::find_method(methods(), name, signature); | |
| 868 } | |
| 869 | |
| 870 methodOop instanceKlass::find_method(objArrayOop methods, symbolOop name, symbolOop signature) { | |
| 871 int len = methods->length(); | |
| 872 // methods are sorted, so do binary search | |
| 873 int l = 0; | |
| 874 int h = len - 1; | |
| 875 while (l <= h) { | |
| 876 int mid = (l + h) >> 1; | |
| 877 methodOop m = (methodOop)methods->obj_at(mid); | |
| 878 assert(m->is_method(), "must be method"); | |
| 879 int res = m->name()->fast_compare(name); | |
| 880 if (res == 0) { | |
| 881 // found matching name; do linear search to find matching signature | |
| 882 // first, quick check for common case | |
| 883 if (m->signature() == signature) return m; | |
| 884 // search downwards through overloaded methods | |
| 885 int i; | |
| 886 for (i = mid - 1; i >= l; i--) { | |
| 887 methodOop m = (methodOop)methods->obj_at(i); | |
| 888 assert(m->is_method(), "must be method"); | |
| 889 if (m->name() != name) break; | |
| 890 if (m->signature() == signature) return m; | |
| 891 } | |
| 892 // search upwards | |
| 893 for (i = mid + 1; i <= h; i++) { | |
| 894 methodOop m = (methodOop)methods->obj_at(i); | |
| 895 assert(m->is_method(), "must be method"); | |
| 896 if (m->name() != name) break; | |
| 897 if (m->signature() == signature) return m; | |
| 898 } | |
| 899 // not found | |
| 900 #ifdef ASSERT | |
| 901 int index = linear_search(methods, name, signature); | |
| 902 if (index != -1) fatal1("binary search bug: should have found entry %d", index); | |
| 903 #endif | |
| 904 return NULL; | |
| 905 } else if (res < 0) { | |
| 906 l = mid + 1; | |
| 907 } else { | |
| 908 h = mid - 1; | |
| 909 } | |
| 910 } | |
| 911 #ifdef ASSERT | |
| 912 int index = linear_search(methods, name, signature); | |
| 913 if (index != -1) fatal1("binary search bug: should have found entry %d", index); | |
| 914 #endif | |
| 915 return NULL; | |
| 916 } | |
| 917 | |
| 918 methodOop instanceKlass::uncached_lookup_method(symbolOop name, symbolOop signature) const { | |
| 919 klassOop klass = as_klassOop(); | |
| 920 while (klass != NULL) { | |
| 921 methodOop method = instanceKlass::cast(klass)->find_method(name, signature); | |
| 922 if (method != NULL) return method; | |
| 923 klass = instanceKlass::cast(klass)->super(); | |
| 924 } | |
| 925 return NULL; | |
| 926 } | |
| 927 | |
| 928 // lookup a method in all the interfaces that this class implements | |
| 929 methodOop instanceKlass::lookup_method_in_all_interfaces(symbolOop name, | |
| 930 symbolOop signature) const { | |
| 931 objArrayOop all_ifs = instanceKlass::cast(as_klassOop())->transitive_interfaces(); | |
| 932 int num_ifs = all_ifs->length(); | |
| 933 instanceKlass *ik = NULL; | |
| 934 for (int i = 0; i < num_ifs; i++) { | |
| 935 ik = instanceKlass::cast(klassOop(all_ifs->obj_at(i))); | |
| 936 methodOop m = ik->lookup_method(name, signature); | |
| 937 if (m != NULL) { | |
| 938 return m; | |
| 939 } | |
| 940 } | |
| 941 return NULL; | |
| 942 } | |
| 943 | |
| 944 /* jni_id_for_impl for jfieldIds only */ | |
| 945 JNIid* instanceKlass::jni_id_for_impl(instanceKlassHandle this_oop, int offset) { | |
| 946 MutexLocker ml(JfieldIdCreation_lock); | |
| 947 // Retry lookup after we got the lock | |
| 948 JNIid* probe = this_oop->jni_ids() == NULL ? NULL : this_oop->jni_ids()->find(offset); | |
| 949 if (probe == NULL) { | |
| 950 // Slow case, allocate new static field identifier | |
| 951 probe = new JNIid(this_oop->as_klassOop(), offset, this_oop->jni_ids()); | |
| 952 this_oop->set_jni_ids(probe); | |
| 953 } | |
| 954 return probe; | |
| 955 } | |
| 956 | |
| 957 | |
| 958 /* jni_id_for for jfieldIds only */ | |
| 959 JNIid* instanceKlass::jni_id_for(int offset) { | |
| 960 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset); | |
| 961 if (probe == NULL) { | |
| 962 probe = jni_id_for_impl(this->as_klassOop(), offset); | |
| 963 } | |
| 964 return probe; | |
| 965 } | |
| 966 | |
| 967 | |
| 968 // Lookup or create a jmethodID. | |
| 969 // This code can be called by the VM thread. For this reason it is critical that | |
| 970 // there are no blocking operations (safepoints) while the lock is held -- or a | |
| 971 // deadlock can occur. | |
| 972 jmethodID instanceKlass::jmethod_id_for_impl(instanceKlassHandle ik_h, methodHandle method_h) { | |
| 973 size_t idnum = (size_t)method_h->method_idnum(); | |
| 974 jmethodID* jmeths = ik_h->methods_jmethod_ids_acquire(); | |
| 975 size_t length = 0; | |
| 976 jmethodID id = NULL; | |
| 977 // array length stored in first element, other elements offset by one | |
| 978 if (jmeths == NULL || // If there is no jmethodID array, | |
| 979 (length = (size_t)jmeths[0]) <= idnum || // or if it is too short, | |
| 980 (id = jmeths[idnum+1]) == NULL) { // or if this jmethodID isn't allocated | |
| 981 | |
| 982 // Do all the safepointing things (allocations) before grabbing the lock. | |
| 983 // These allocations will have to be freed if they are unused. | |
| 984 | |
| 985 // Allocate a new array of methods. | |
| 986 jmethodID* new_jmeths = NULL; | |
| 987 if (length <= idnum) { | |
| 988 // A new array will be needed (unless some other thread beats us to it) | |
| 989 size_t size = MAX2(idnum+1, (size_t)ik_h->idnum_allocated_count()); | |
| 990 new_jmeths = NEW_C_HEAP_ARRAY(jmethodID, size+1); | |
| 991 memset(new_jmeths, 0, (size+1)*sizeof(jmethodID)); | |
| 992 new_jmeths[0] =(jmethodID)size; // array size held in the first element | |
| 993 } | |
| 994 | |
| 995 // Allocate a new method ID. | |
| 996 jmethodID new_id = NULL; | |
| 997 if (method_h->is_old() && !method_h->is_obsolete()) { | |
| 998 // The method passed in is old (but not obsolete), we need to use the current version | |
| 999 methodOop current_method = ik_h->method_with_idnum((int)idnum); | |
| 1000 assert(current_method != NULL, "old and but not obsolete, so should exist"); | |
| 1001 methodHandle current_method_h(current_method == NULL? method_h() : current_method); | |
| 1002 new_id = JNIHandles::make_jmethod_id(current_method_h); | |
| 1003 } else { | |
| 1004 // It is the current version of the method or an obsolete method, | |
| 1005 // use the version passed in | |
| 1006 new_id = JNIHandles::make_jmethod_id(method_h); | |
| 1007 } | |
| 1008 | |
|
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1009 if (Threads::number_of_threads() == 0 || SafepointSynchronize::is_at_safepoint()) { |
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1010 // No need and unsafe to lock the JmethodIdCreation_lock at safepoint. |
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1011 id = get_jmethod_id(ik_h, idnum, new_id, new_jmeths); |
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1012 } else { |
| 0 | 1013 MutexLocker ml(JmethodIdCreation_lock); |
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1014 id = get_jmethod_id(ik_h, idnum, new_id, new_jmeths); |
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1015 } |
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1016 } |
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1017 return id; |
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1018 } |
| 0 | 1019 |
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1020 |
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1021 jmethodID instanceKlass::get_jmethod_id(instanceKlassHandle ik_h, size_t idnum, |
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1022 jmethodID new_id, jmethodID* new_jmeths) { |
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1023 // Retry lookup after we got the lock or ensured we are at safepoint |
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1024 jmethodID* jmeths = ik_h->methods_jmethod_ids_acquire(); |
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1025 jmethodID id = NULL; |
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1026 jmethodID to_dealloc_id = NULL; |
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1027 jmethodID* to_dealloc_jmeths = NULL; |
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1028 size_t length; |
| 0 | 1029 |
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1030 if (jmeths == NULL || (length = (size_t)jmeths[0]) <= idnum) { |
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1031 if (jmeths != NULL) { |
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1032 // We have grown the array: copy the existing entries, and delete the old array |
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1033 for (size_t index = 0; index < length; index++) { |
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1034 new_jmeths[index+1] = jmeths[index+1]; |
| 0 | 1035 } |
|
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1036 to_dealloc_jmeths = jmeths; // using the new jmeths, deallocate the old one |
| 0 | 1037 } |
|
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1038 ik_h->release_set_methods_jmethod_ids(jmeths = new_jmeths); |
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1039 } else { |
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1040 id = jmeths[idnum+1]; |
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1041 to_dealloc_jmeths = new_jmeths; // using the old jmeths, deallocate the new one |
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1042 } |
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1043 if (id == NULL) { |
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1044 id = new_id; |
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1045 jmeths[idnum+1] = id; // install the new method ID |
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1046 } else { |
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1047 to_dealloc_id = new_id; // the new id wasn't used, mark it for deallocation |
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1048 } |
| 0 | 1049 |
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1050 // Free up unneeded or no longer needed resources |
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1051 FreeHeap(to_dealloc_jmeths); |
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1052 if (to_dealloc_id != NULL) { |
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1053 JNIHandles::destroy_jmethod_id(to_dealloc_id); |
| 0 | 1054 } |
| 1055 return id; | |
| 1056 } | |
| 1057 | |
| 1058 | |
| 1059 // Lookup a jmethodID, NULL if not found. Do no blocking, no allocations, no handles | |
| 1060 jmethodID instanceKlass::jmethod_id_or_null(methodOop method) { | |
| 1061 size_t idnum = (size_t)method->method_idnum(); | |
| 1062 jmethodID* jmeths = methods_jmethod_ids_acquire(); | |
| 1063 size_t length; // length assigned as debugging crumb | |
| 1064 jmethodID id = NULL; | |
| 1065 if (jmeths != NULL && // If there is a jmethodID array, | |
| 1066 (length = (size_t)jmeths[0]) > idnum) { // and if it is long enough, | |
| 1067 id = jmeths[idnum+1]; // Look up the id (may be NULL) | |
| 1068 } | |
| 1069 return id; | |
| 1070 } | |
| 1071 | |
| 1072 | |
| 1073 // Cache an itable index | |
| 1074 void instanceKlass::set_cached_itable_index(size_t idnum, int index) { | |
| 1075 int* indices = methods_cached_itable_indices_acquire(); | |
| 1076 if (indices == NULL || // If there is no index array, | |
| 1077 ((size_t)indices[0]) <= idnum) { // or if it is too short | |
| 1078 // Lock before we allocate the array so we don't leak | |
| 1079 MutexLocker ml(JNICachedItableIndex_lock); | |
| 1080 // Retry lookup after we got the lock | |
| 1081 indices = methods_cached_itable_indices_acquire(); | |
| 1082 size_t length = 0; | |
| 1083 // array length stored in first element, other elements offset by one | |
| 1084 if (indices == NULL || (length = (size_t)indices[0]) <= idnum) { | |
| 1085 size_t size = MAX2(idnum+1, (size_t)idnum_allocated_count()); | |
| 1086 int* new_indices = NEW_C_HEAP_ARRAY(int, size+1); | |
| 1087 // Copy the existing entries, if any | |
| 1088 size_t i; | |
| 1089 for (i = 0; i < length; i++) { | |
| 1090 new_indices[i+1] = indices[i+1]; | |
| 1091 } | |
| 1092 // Set all the rest to -1 | |
| 1093 for (i = length; i < size; i++) { | |
| 1094 new_indices[i+1] = -1; | |
| 1095 } | |
| 1096 if (indices != NULL) { | |
| 1097 FreeHeap(indices); // delete any old indices | |
| 1098 } | |
| 1099 release_set_methods_cached_itable_indices(indices = new_indices); | |
| 1100 } | |
| 1101 } else { | |
| 1102 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); | |
| 1103 } | |
| 1104 // This is a cache, if there is a race to set it, it doesn't matter | |
| 1105 indices[idnum+1] = index; | |
| 1106 } | |
| 1107 | |
| 1108 | |
| 1109 // Retrieve a cached itable index | |
| 1110 int instanceKlass::cached_itable_index(size_t idnum) { | |
| 1111 int* indices = methods_cached_itable_indices_acquire(); | |
| 1112 if (indices != NULL && ((size_t)indices[0]) > idnum) { | |
| 1113 // indices exist and are long enough, retrieve possible cached | |
| 1114 return indices[idnum+1]; | |
| 1115 } | |
| 1116 return -1; | |
| 1117 } | |
| 1118 | |
| 1119 | |
| 1120 // | |
| 1121 // nmethodBucket is used to record dependent nmethods for | |
| 1122 // deoptimization. nmethod dependencies are actually <klass, method> | |
| 1123 // pairs but we really only care about the klass part for purposes of | |
| 1124 // finding nmethods which might need to be deoptimized. Instead of | |
| 1125 // recording the method, a count of how many times a particular nmethod | |
| 1126 // was recorded is kept. This ensures that any recording errors are | |
| 1127 // noticed since an nmethod should be removed as many times are it's | |
| 1128 // added. | |
| 1129 // | |
| 1130 class nmethodBucket { | |
| 1131 private: | |
| 1132 nmethod* _nmethod; | |
| 1133 int _count; | |
| 1134 nmethodBucket* _next; | |
| 1135 | |
| 1136 public: | |
| 1137 nmethodBucket(nmethod* nmethod, nmethodBucket* next) { | |
| 1138 _nmethod = nmethod; | |
| 1139 _next = next; | |
| 1140 _count = 1; | |
| 1141 } | |
| 1142 int count() { return _count; } | |
| 1143 int increment() { _count += 1; return _count; } | |
| 1144 int decrement() { _count -= 1; assert(_count >= 0, "don't underflow"); return _count; } | |
| 1145 nmethodBucket* next() { return _next; } | |
| 1146 void set_next(nmethodBucket* b) { _next = b; } | |
| 1147 nmethod* get_nmethod() { return _nmethod; } | |
| 1148 }; | |
| 1149 | |
| 1150 | |
| 1151 // | |
| 1152 // Walk the list of dependent nmethods searching for nmethods which | |
| 1153 // are dependent on the klassOop that was passed in and mark them for | |
| 1154 // deoptimization. Returns the number of nmethods found. | |
| 1155 // | |
| 1156 int instanceKlass::mark_dependent_nmethods(DepChange& changes) { | |
| 1157 assert_locked_or_safepoint(CodeCache_lock); | |
| 1158 int found = 0; | |
| 1159 nmethodBucket* b = _dependencies; | |
| 1160 while (b != NULL) { | |
| 1161 nmethod* nm = b->get_nmethod(); | |
| 1162 // since dependencies aren't removed until an nmethod becomes a zombie, | |
| 1163 // the dependency list may contain nmethods which aren't alive. | |
| 1164 if (nm->is_alive() && !nm->is_marked_for_deoptimization() && nm->check_dependency_on(changes)) { | |
| 1165 if (TraceDependencies) { | |
| 1166 ResourceMark rm; | |
| 1167 tty->print_cr("Marked for deoptimization"); | |
| 1168 tty->print_cr(" context = %s", this->external_name()); | |
| 1169 changes.print(); | |
| 1170 nm->print(); | |
| 1171 nm->print_dependencies(); | |
| 1172 } | |
| 1173 nm->mark_for_deoptimization(); | |
| 1174 found++; | |
| 1175 } | |
| 1176 b = b->next(); | |
| 1177 } | |
| 1178 return found; | |
| 1179 } | |
| 1180 | |
| 1181 | |
| 1182 // | |
| 1183 // Add an nmethodBucket to the list of dependencies for this nmethod. | |
| 1184 // It's possible that an nmethod has multiple dependencies on this klass | |
| 1185 // so a count is kept for each bucket to guarantee that creation and | |
| 1186 // deletion of dependencies is consistent. | |
| 1187 // | |
| 1188 void instanceKlass::add_dependent_nmethod(nmethod* nm) { | |
| 1189 assert_locked_or_safepoint(CodeCache_lock); | |
| 1190 nmethodBucket* b = _dependencies; | |
| 1191 nmethodBucket* last = NULL; | |
| 1192 while (b != NULL) { | |
| 1193 if (nm == b->get_nmethod()) { | |
| 1194 b->increment(); | |
| 1195 return; | |
| 1196 } | |
| 1197 b = b->next(); | |
| 1198 } | |
| 1199 _dependencies = new nmethodBucket(nm, _dependencies); | |
| 1200 } | |
| 1201 | |
| 1202 | |
| 1203 // | |
| 1204 // Decrement count of the nmethod in the dependency list and remove | |
| 1205 // the bucket competely when the count goes to 0. This method must | |
| 1206 // find a corresponding bucket otherwise there's a bug in the | |
| 1207 // recording of dependecies. | |
| 1208 // | |
| 1209 void instanceKlass::remove_dependent_nmethod(nmethod* nm) { | |
| 1210 assert_locked_or_safepoint(CodeCache_lock); | |
| 1211 nmethodBucket* b = _dependencies; | |
| 1212 nmethodBucket* last = NULL; | |
| 1213 while (b != NULL) { | |
| 1214 if (nm == b->get_nmethod()) { | |
| 1215 if (b->decrement() == 0) { | |
| 1216 if (last == NULL) { | |
| 1217 _dependencies = b->next(); | |
| 1218 } else { | |
| 1219 last->set_next(b->next()); | |
| 1220 } | |
| 1221 delete b; | |
| 1222 } | |
| 1223 return; | |
| 1224 } | |
| 1225 last = b; | |
| 1226 b = b->next(); | |
| 1227 } | |
| 1228 #ifdef ASSERT | |
| 1229 tty->print_cr("### %s can't find dependent nmethod:", this->external_name()); | |
| 1230 nm->print(); | |
| 1231 #endif // ASSERT | |
| 1232 ShouldNotReachHere(); | |
| 1233 } | |
| 1234 | |
| 1235 | |
| 1236 #ifndef PRODUCT | |
| 1237 void instanceKlass::print_dependent_nmethods(bool verbose) { | |
| 1238 nmethodBucket* b = _dependencies; | |
| 1239 int idx = 0; | |
| 1240 while (b != NULL) { | |
| 1241 nmethod* nm = b->get_nmethod(); | |
| 1242 tty->print("[%d] count=%d { ", idx++, b->count()); | |
| 1243 if (!verbose) { | |
| 1244 nm->print_on(tty, "nmethod"); | |
| 1245 tty->print_cr(" } "); | |
| 1246 } else { | |
| 1247 nm->print(); | |
| 1248 nm->print_dependencies(); | |
| 1249 tty->print_cr("--- } "); | |
| 1250 } | |
| 1251 b = b->next(); | |
| 1252 } | |
| 1253 } | |
| 1254 | |
| 1255 | |
| 1256 bool instanceKlass::is_dependent_nmethod(nmethod* nm) { | |
| 1257 nmethodBucket* b = _dependencies; | |
| 1258 while (b != NULL) { | |
| 1259 if (nm == b->get_nmethod()) { | |
| 1260 return true; | |
| 1261 } | |
| 1262 b = b->next(); | |
| 1263 } | |
| 1264 return false; | |
| 1265 } | |
| 1266 #endif //PRODUCT | |
| 1267 | |
| 1268 | |
|
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1269 #ifdef ASSERT |
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1270 template <class T> void assert_is_in(T *p) { |
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1271 T heap_oop = oopDesc::load_heap_oop(p); |
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1272 if (!oopDesc::is_null(heap_oop)) { |
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1273 oop o = oopDesc::decode_heap_oop_not_null(heap_oop); |
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1274 assert(Universe::heap()->is_in(o), "should be in heap"); |
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1275 } |
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1276 } |
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1277 template <class T> void assert_is_in_closed_subset(T *p) { |
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1278 T heap_oop = oopDesc::load_heap_oop(p); |
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1279 if (!oopDesc::is_null(heap_oop)) { |
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1280 oop o = oopDesc::decode_heap_oop_not_null(heap_oop); |
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1281 assert(Universe::heap()->is_in_closed_subset(o), "should be in closed"); |
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1282 } |
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1283 } |
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1284 template <class T> void assert_is_in_reserved(T *p) { |
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1285 T heap_oop = oopDesc::load_heap_oop(p); |
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1286 if (!oopDesc::is_null(heap_oop)) { |
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1287 oop o = oopDesc::decode_heap_oop_not_null(heap_oop); |
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1288 assert(Universe::heap()->is_in_reserved(o), "should be in reserved"); |
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1289 } |
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1290 } |
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1291 template <class T> void assert_nothing(T *p) {} |
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1292 |
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1293 #else |
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1294 template <class T> void assert_is_in(T *p) {} |
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1295 template <class T> void assert_is_in_closed_subset(T *p) {} |
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1296 template <class T> void assert_is_in_reserved(T *p) {} |
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1297 template <class T> void assert_nothing(T *p) {} |
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1298 #endif // ASSERT |
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1299 |
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1300 // |
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1301 // Macros that iterate over areas of oops which are specialized on type of |
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1302 // oop pointer either narrow or wide, depending on UseCompressedOops |
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1303 // |
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1304 // Parameters are: |
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1305 // T - type of oop to point to (either oop or narrowOop) |
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1306 // start_p - starting pointer for region to iterate over |
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1307 // count - number of oops or narrowOops to iterate over |
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1308 // do_oop - action to perform on each oop (it's arbitrary C code which |
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1309 // makes it more efficient to put in a macro rather than making |
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1310 // it a template function) |
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1311 // assert_fn - assert function which is template function because performance |
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1312 // doesn't matter when enabled. |
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1313 #define InstanceKlass_SPECIALIZED_OOP_ITERATE( \ |
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1314 T, start_p, count, do_oop, \ |
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1315 assert_fn) \ |
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1316 { \ |
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1317 T* p = (T*)(start_p); \ |
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1318 T* const end = p + (count); \ |
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1319 while (p < end) { \ |
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1320 (assert_fn)(p); \ |
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1321 do_oop; \ |
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1322 ++p; \ |
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1323 } \ |
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1324 } |
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1325 |
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1326 #define InstanceKlass_SPECIALIZED_OOP_REVERSE_ITERATE( \ |
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1327 T, start_p, count, do_oop, \ |
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1328 assert_fn) \ |
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1329 { \ |
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1330 T* const start = (T*)(start_p); \ |
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1331 T* p = start + (count); \ |
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1332 while (start < p) { \ |
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1333 --p; \ |
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1334 (assert_fn)(p); \ |
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1335 do_oop; \ |
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1336 } \ |
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1337 } |
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1338 |
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1339 #define InstanceKlass_SPECIALIZED_BOUNDED_OOP_ITERATE( \ |
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1340 T, start_p, count, low, high, \ |
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1341 do_oop, assert_fn) \ |
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1342 { \ |
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1343 T* const l = (T*)(low); \ |
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1344 T* const h = (T*)(high); \ |
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1345 assert(mask_bits((intptr_t)l, sizeof(T)-1) == 0 && \ |
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1346 mask_bits((intptr_t)h, sizeof(T)-1) == 0, \ |
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1347 "bounded region must be properly aligned"); \ |
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1348 T* p = (T*)(start_p); \ |
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1349 T* end = p + (count); \ |
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1350 if (p < l) p = l; \ |
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1351 if (end > h) end = h; \ |
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1352 while (p < end) { \ |
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1353 (assert_fn)(p); \ |
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1354 do_oop; \ |
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1355 ++p; \ |
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1356 } \ |
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1357 } |
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1358 |
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1359 |
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1360 // The following macros call specialized macros, passing either oop or |
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1361 // narrowOop as the specialization type. These test the UseCompressedOops |
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1362 // flag. |
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1363 #define InstanceKlass_OOP_ITERATE(start_p, count, \ |
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1364 do_oop, assert_fn) \ |
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1365 { \ |
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1366 if (UseCompressedOops) { \ |
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1367 InstanceKlass_SPECIALIZED_OOP_ITERATE(narrowOop, \ |
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1368 start_p, count, \ |
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1369 do_oop, assert_fn) \ |
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1370 } else { \ |
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1371 InstanceKlass_SPECIALIZED_OOP_ITERATE(oop, \ |
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1372 start_p, count, \ |
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1373 do_oop, assert_fn) \ |
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1374 } \ |
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1375 } |
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1376 |
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1377 #define InstanceKlass_BOUNDED_OOP_ITERATE(start_p, count, low, high, \ |
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1378 do_oop, assert_fn) \ |
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1379 { \ |
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1380 if (UseCompressedOops) { \ |
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1381 InstanceKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(narrowOop, \ |
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1382 start_p, count, \ |
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1383 low, high, \ |
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1384 do_oop, assert_fn) \ |
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1385 } else { \ |
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1386 InstanceKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(oop, \ |
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1387 start_p, count, \ |
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1388 low, high, \ |
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1389 do_oop, assert_fn) \ |
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1390 } \ |
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1391 } |
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1392 |
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1393 #define InstanceKlass_OOP_MAP_ITERATE(obj, do_oop, assert_fn) \ |
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1394 { \ |
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1395 /* Compute oopmap block range. The common case \ |
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1396 is nonstatic_oop_map_size == 1. */ \ |
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1397 OopMapBlock* map = start_of_nonstatic_oop_maps(); \ |
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1398 OopMapBlock* const end_map = map + nonstatic_oop_map_size(); \ |
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1399 if (UseCompressedOops) { \ |
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1400 while (map < end_map) { \ |
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1401 InstanceKlass_SPECIALIZED_OOP_ITERATE(narrowOop, \ |
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1402 obj->obj_field_addr<narrowOop>(map->offset()), map->length(), \ |
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1403 do_oop, assert_fn) \ |
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1404 ++map; \ |
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1405 } \ |
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1406 } else { \ |
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1407 while (map < end_map) { \ |
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1408 InstanceKlass_SPECIALIZED_OOP_ITERATE(oop, \ |
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1409 obj->obj_field_addr<oop>(map->offset()), map->length(), \ |
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1410 do_oop, assert_fn) \ |
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1411 ++map; \ |
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1412 } \ |
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1413 } \ |
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1414 } |
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1415 |
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1416 #define InstanceKlass_OOP_MAP_REVERSE_ITERATE(obj, do_oop, assert_fn) \ |
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1417 { \ |
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1418 OopMapBlock* const start_map = start_of_nonstatic_oop_maps(); \ |
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1419 OopMapBlock* map = start_map + nonstatic_oop_map_size(); \ |
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1420 if (UseCompressedOops) { \ |
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1421 while (start_map < map) { \ |
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1422 --map; \ |
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1423 InstanceKlass_SPECIALIZED_OOP_REVERSE_ITERATE(narrowOop, \ |
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1424 obj->obj_field_addr<narrowOop>(map->offset()), map->length(), \ |
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1425 do_oop, assert_fn) \ |
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1426 } \ |
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1427 } else { \ |
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1428 while (start_map < map) { \ |
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1429 --map; \ |
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1430 InstanceKlass_SPECIALIZED_OOP_REVERSE_ITERATE(oop, \ |
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1431 obj->obj_field_addr<oop>(map->offset()), map->length(), \ |
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1432 do_oop, assert_fn) \ |
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1433 } \ |
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1434 } \ |
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1435 } |
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1436 |
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1437 #define InstanceKlass_BOUNDED_OOP_MAP_ITERATE(obj, low, high, do_oop, \ |
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1438 assert_fn) \ |
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1439 { \ |
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1440 /* Compute oopmap block range. The common case is \ |
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1441 nonstatic_oop_map_size == 1, so we accept the \ |
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1442 usually non-existent extra overhead of examining \ |
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1443 all the maps. */ \ |
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1444 OopMapBlock* map = start_of_nonstatic_oop_maps(); \ |
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1445 OopMapBlock* const end_map = map + nonstatic_oop_map_size(); \ |
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1446 if (UseCompressedOops) { \ |
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1447 while (map < end_map) { \ |
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1448 InstanceKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(narrowOop, \ |
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1449 obj->obj_field_addr<narrowOop>(map->offset()), map->length(), \ |
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1450 low, high, \ |
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1451 do_oop, assert_fn) \ |
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1452 ++map; \ |
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1453 } \ |
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1454 } else { \ |
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1455 while (map < end_map) { \ |
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1456 InstanceKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(oop, \ |
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1457 obj->obj_field_addr<oop>(map->offset()), map->length(), \ |
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1458 low, high, \ |
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1459 do_oop, assert_fn) \ |
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1460 ++map; \ |
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1461 } \ |
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1462 } \ |
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1463 } |
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1464 |
| 0 | 1465 void instanceKlass::follow_static_fields() { |
|
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1466 InstanceKlass_OOP_ITERATE( \ |
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1467 start_of_static_fields(), static_oop_field_size(), \ |
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1468 MarkSweep::mark_and_push(p), \ |
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1469 assert_is_in_closed_subset) |
| 0 | 1470 } |
| 1471 | |
| 1472 #ifndef SERIALGC | |
| 1473 void instanceKlass::follow_static_fields(ParCompactionManager* cm) { | |
|
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1474 InstanceKlass_OOP_ITERATE( \ |
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1475 start_of_static_fields(), static_oop_field_size(), \ |
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1476 PSParallelCompact::mark_and_push(cm, p), \ |
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1477 assert_is_in) |
| 0 | 1478 } |
| 1479 #endif // SERIALGC | |
| 1480 | |
| 1481 void instanceKlass::adjust_static_fields() { | |
|
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1482 InstanceKlass_OOP_ITERATE( \ |
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1483 start_of_static_fields(), static_oop_field_size(), \ |
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1484 MarkSweep::adjust_pointer(p), \ |
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1485 assert_nothing) |
| 0 | 1486 } |
| 1487 | |
| 1488 #ifndef SERIALGC | |
| 1489 void instanceKlass::update_static_fields() { | |
|
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1490 InstanceKlass_OOP_ITERATE( \ |
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1491 start_of_static_fields(), static_oop_field_size(), \ |
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1492 PSParallelCompact::adjust_pointer(p), \ |
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1493 assert_nothing) |
| 0 | 1494 } |
| 1495 | |
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1496 void instanceKlass::update_static_fields(HeapWord* beg_addr, HeapWord* end_addr) { |
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1497 InstanceKlass_BOUNDED_OOP_ITERATE( \ |
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1498 start_of_static_fields(), static_oop_field_size(), \ |
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1499 beg_addr, end_addr, \ |
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1500 PSParallelCompact::adjust_pointer(p), \ |
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1501 assert_nothing ) |
| 0 | 1502 } |
| 1503 #endif // SERIALGC | |
| 1504 | |
| 1505 void instanceKlass::oop_follow_contents(oop obj) { | |
|
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1506 assert(obj != NULL, "can't follow the content of NULL object"); |
| 0 | 1507 obj->follow_header(); |
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1508 InstanceKlass_OOP_MAP_ITERATE( \ |
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1509 obj, \ |
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1510 MarkSweep::mark_and_push(p), \ |
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1511 assert_is_in_closed_subset) |
| 0 | 1512 } |
| 1513 | |
| 1514 #ifndef SERIALGC | |
| 1515 void instanceKlass::oop_follow_contents(ParCompactionManager* cm, | |
| 1516 oop obj) { | |
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1517 assert(obj != NULL, "can't follow the content of NULL object"); |
| 0 | 1518 obj->follow_header(cm); |
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1519 InstanceKlass_OOP_MAP_ITERATE( \ |
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1520 obj, \ |
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1521 PSParallelCompact::mark_and_push(cm, p), \ |
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1522 assert_is_in) |
| 0 | 1523 } |
| 1524 #endif // SERIALGC | |
| 1525 | |
| 1526 // closure's do_header() method dicates whether the given closure should be | |
| 1527 // applied to the klass ptr in the object header. | |
| 1528 | |
|
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1529 #define InstanceKlass_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \ |
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1530 \ |
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1531 int instanceKlass::oop_oop_iterate##nv_suffix(oop obj, OopClosureType* closure) { \ |
|
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1532 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::ik);\ |
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1533 /* header */ \ |
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1534 if (closure->do_header()) { \ |
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1535 obj->oop_iterate_header(closure); \ |
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1536 } \ |
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1537 InstanceKlass_OOP_MAP_ITERATE( \ |
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1538 obj, \ |
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1539 SpecializationStats:: \ |
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1540 record_do_oop_call##nv_suffix(SpecializationStats::ik); \ |
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1541 (closure)->do_oop##nv_suffix(p), \ |
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1542 assert_is_in_closed_subset) \ |
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1543 return size_helper(); \ |
| 0 | 1544 } |
| 1545 | |
|
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1546 #ifndef SERIALGC |
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1547 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix) \ |
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1548 \ |
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1549 int instanceKlass::oop_oop_iterate_backwards##nv_suffix(oop obj, \ |
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1550 OopClosureType* closure) { \ |
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1551 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::ik); \ |
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1552 /* header */ \ |
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1553 if (closure->do_header()) { \ |
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1554 obj->oop_iterate_header(closure); \ |
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1555 } \ |
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1556 /* instance variables */ \ |
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1557 InstanceKlass_OOP_MAP_REVERSE_ITERATE( \ |
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1558 obj, \ |
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1559 SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::ik);\ |
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1560 (closure)->do_oop##nv_suffix(p), \ |
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1561 assert_is_in_closed_subset) \ |
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1562 return size_helper(); \ |
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1563 } |
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1564 #endif // !SERIALGC |
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1565 |
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1566 #define InstanceKlass_OOP_OOP_ITERATE_DEFN_m(OopClosureType, nv_suffix) \ |
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1567 \ |
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1568 int instanceKlass::oop_oop_iterate##nv_suffix##_m(oop obj, \ |
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1569 OopClosureType* closure, \ |
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1570 MemRegion mr) { \ |
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1571 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::ik);\ |
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1572 if (closure->do_header()) { \ |
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1573 obj->oop_iterate_header(closure, mr); \ |
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1574 } \ |
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1575 InstanceKlass_BOUNDED_OOP_MAP_ITERATE( \ |
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1576 obj, mr.start(), mr.end(), \ |
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1577 (closure)->do_oop##nv_suffix(p), \ |
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1578 assert_is_in_closed_subset) \ |
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1579 return size_helper(); \ |
| 0 | 1580 } |
| 1581 | |
| 1582 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DEFN) | |
|
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1583 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DEFN) |
| 0 | 1584 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DEFN_m) |
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1585 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DEFN_m) |
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1586 #ifndef SERIALGC |
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1587 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN) |
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1588 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN) |
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1589 #endif // !SERIALGC |
| 0 | 1590 |
| 1591 void instanceKlass::iterate_static_fields(OopClosure* closure) { | |
|
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1592 InstanceKlass_OOP_ITERATE( \ |
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1593 start_of_static_fields(), static_oop_field_size(), \ |
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1594 closure->do_oop(p), \ |
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1595 assert_is_in_reserved) |
| 0 | 1596 } |
| 1597 | |
| 1598 void instanceKlass::iterate_static_fields(OopClosure* closure, | |
| 1599 MemRegion mr) { | |
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1600 InstanceKlass_BOUNDED_OOP_ITERATE( \ |
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1601 start_of_static_fields(), static_oop_field_size(), \ |
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1602 mr.start(), mr.end(), \ |
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1603 (closure)->do_oop_v(p), \ |
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1604 assert_is_in_closed_subset) |
| 0 | 1605 } |
| 1606 | |
| 1607 int instanceKlass::oop_adjust_pointers(oop obj) { | |
| 1608 int size = size_helper(); | |
|
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1609 InstanceKlass_OOP_MAP_ITERATE( \ |
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1610 obj, \ |
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1611 MarkSweep::adjust_pointer(p), \ |
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1612 assert_is_in) |
| 0 | 1613 obj->adjust_header(); |
| 1614 return size; | |
| 1615 } | |
| 1616 | |
| 1617 #ifndef SERIALGC | |
| 1618 void instanceKlass::oop_copy_contents(PSPromotionManager* pm, oop obj) { | |
| 1619 assert(!pm->depth_first(), "invariant"); | |
|
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1620 InstanceKlass_OOP_MAP_REVERSE_ITERATE( \ |
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1621 obj, \ |
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1622 if (PSScavenge::should_scavenge(p)) { \ |
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1623 pm->claim_or_forward_breadth(p); \ |
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1624 }, \ |
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1625 assert_nothing ) |
| 0 | 1626 } |
| 1627 | |
| 1628 void instanceKlass::oop_push_contents(PSPromotionManager* pm, oop obj) { | |
| 1629 assert(pm->depth_first(), "invariant"); | |
|
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1630 InstanceKlass_OOP_MAP_REVERSE_ITERATE( \ |
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1631 obj, \ |
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1632 if (PSScavenge::should_scavenge(p)) { \ |
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1633 pm->claim_or_forward_depth(p); \ |
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1634 }, \ |
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1635 assert_nothing ) |
| 0 | 1636 } |
| 1637 | |
| 1638 int instanceKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) { | |
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1639 InstanceKlass_OOP_MAP_ITERATE( \ |
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1640 obj, \ |
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1641 PSParallelCompact::adjust_pointer(p), \ |
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1642 assert_nothing) |
| 0 | 1643 return size_helper(); |
| 1644 } | |
| 1645 | |
| 1646 int instanceKlass::oop_update_pointers(ParCompactionManager* cm, oop obj, | |
| 1647 HeapWord* beg_addr, HeapWord* end_addr) { | |
|
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1648 InstanceKlass_BOUNDED_OOP_MAP_ITERATE( \ |
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1649 obj, beg_addr, end_addr, \ |
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1650 PSParallelCompact::adjust_pointer(p), \ |
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1651 assert_nothing) |
| 0 | 1652 return size_helper(); |
| 1653 } | |
| 1654 | |
| 1655 void instanceKlass::copy_static_fields(PSPromotionManager* pm) { | |
| 1656 assert(!pm->depth_first(), "invariant"); | |
|
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1657 InstanceKlass_OOP_ITERATE( \ |
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1658 start_of_static_fields(), static_oop_field_size(), \ |
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1659 if (PSScavenge::should_scavenge(p)) { \ |
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1660 pm->claim_or_forward_breadth(p); \ |
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1661 }, \ |
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1662 assert_nothing ) |
| 0 | 1663 } |
| 1664 | |
| 1665 void instanceKlass::push_static_fields(PSPromotionManager* pm) { | |
| 1666 assert(pm->depth_first(), "invariant"); | |
|
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1667 InstanceKlass_OOP_ITERATE( \ |
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1668 start_of_static_fields(), static_oop_field_size(), \ |
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1669 if (PSScavenge::should_scavenge(p)) { \ |
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1670 pm->claim_or_forward_depth(p); \ |
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1671 }, \ |
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1672 assert_nothing ) |
| 0 | 1673 } |
| 1674 | |
| 1675 void instanceKlass::copy_static_fields(ParCompactionManager* cm) { | |
|
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1676 InstanceKlass_OOP_ITERATE( \ |
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1677 start_of_static_fields(), static_oop_field_size(), \ |
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1678 PSParallelCompact::adjust_pointer(p), \ |
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1679 assert_is_in) |
| 0 | 1680 } |
| 1681 #endif // SERIALGC | |
| 1682 | |
| 1683 // This klass is alive but the implementor link is not followed/updated. | |
| 1684 // Subklass and sibling links are handled by Klass::follow_weak_klass_links | |
| 1685 | |
| 1686 void instanceKlass::follow_weak_klass_links( | |
| 1687 BoolObjectClosure* is_alive, OopClosure* keep_alive) { | |
| 1688 assert(is_alive->do_object_b(as_klassOop()), "this oop should be live"); | |
| 1689 if (ClassUnloading) { | |
| 1690 for (int i = 0; i < implementors_limit; i++) { | |
| 1691 klassOop impl = _implementors[i]; | |
| 1692 if (impl == NULL) break; // no more in the list | |
| 1693 if (!is_alive->do_object_b(impl)) { | |
| 1694 // remove this guy from the list by overwriting him with the tail | |
| 1695 int lasti = --_nof_implementors; | |
| 1696 assert(lasti >= i && lasti < implementors_limit, "just checking"); | |
| 1697 _implementors[i] = _implementors[lasti]; | |
| 1698 _implementors[lasti] = NULL; | |
| 1699 --i; // rerun the loop at this index | |
| 1700 } | |
| 1701 } | |
| 1702 } else { | |
| 1703 for (int i = 0; i < implementors_limit; i++) { | |
| 1704 keep_alive->do_oop(&adr_implementors()[i]); | |
| 1705 } | |
| 1706 } | |
| 1707 Klass::follow_weak_klass_links(is_alive, keep_alive); | |
| 1708 } | |
| 1709 | |
| 1710 void instanceKlass::remove_unshareable_info() { | |
| 1711 Klass::remove_unshareable_info(); | |
| 1712 init_implementor(); | |
| 1713 } | |
| 1714 | |
| 1715 static void clear_all_breakpoints(methodOop m) { | |
| 1716 m->clear_all_breakpoints(); | |
| 1717 } | |
| 1718 | |
| 1719 void instanceKlass::release_C_heap_structures() { | |
| 1720 // Deallocate oop map cache | |
| 1721 if (_oop_map_cache != NULL) { | |
| 1722 delete _oop_map_cache; | |
| 1723 _oop_map_cache = NULL; | |
| 1724 } | |
| 1725 | |
| 1726 // Deallocate JNI identifiers for jfieldIDs | |
| 1727 JNIid::deallocate(jni_ids()); | |
| 1728 set_jni_ids(NULL); | |
| 1729 | |
| 1730 jmethodID* jmeths = methods_jmethod_ids_acquire(); | |
| 1731 if (jmeths != (jmethodID*)NULL) { | |
| 1732 release_set_methods_jmethod_ids(NULL); | |
| 1733 FreeHeap(jmeths); | |
| 1734 } | |
| 1735 | |
| 1736 int* indices = methods_cached_itable_indices_acquire(); | |
| 1737 if (indices != (int*)NULL) { | |
| 1738 release_set_methods_cached_itable_indices(NULL); | |
| 1739 FreeHeap(indices); | |
| 1740 } | |
| 1741 | |
| 1742 // release dependencies | |
| 1743 nmethodBucket* b = _dependencies; | |
| 1744 _dependencies = NULL; | |
| 1745 while (b != NULL) { | |
| 1746 nmethodBucket* next = b->next(); | |
| 1747 delete b; | |
| 1748 b = next; | |
| 1749 } | |
| 1750 | |
| 1751 // Deallocate breakpoint records | |
| 1752 if (breakpoints() != 0x0) { | |
| 1753 methods_do(clear_all_breakpoints); | |
| 1754 assert(breakpoints() == 0x0, "should have cleared breakpoints"); | |
| 1755 } | |
| 1756 | |
| 1757 // deallocate information about previous versions | |
| 1758 if (_previous_versions != NULL) { | |
| 1759 for (int i = _previous_versions->length() - 1; i >= 0; i--) { | |
| 1760 PreviousVersionNode * pv_node = _previous_versions->at(i); | |
| 1761 delete pv_node; | |
| 1762 } | |
| 1763 delete _previous_versions; | |
| 1764 _previous_versions = NULL; | |
| 1765 } | |
| 1766 | |
| 1767 // deallocate the cached class file | |
| 1768 if (_cached_class_file_bytes != NULL) { | |
| 1769 os::free(_cached_class_file_bytes); | |
| 1770 _cached_class_file_bytes = NULL; | |
| 1771 _cached_class_file_len = 0; | |
| 1772 } | |
| 1773 } | |
| 1774 | |
| 1775 char* instanceKlass::signature_name() const { | |
| 1776 const char* src = (const char*) (name()->as_C_string()); | |
| 1777 const int src_length = (int)strlen(src); | |
| 1778 char* dest = NEW_RESOURCE_ARRAY(char, src_length + 3); | |
| 1779 int src_index = 0; | |
| 1780 int dest_index = 0; | |
| 1781 dest[dest_index++] = 'L'; | |
| 1782 while (src_index < src_length) { | |
| 1783 dest[dest_index++] = src[src_index++]; | |
| 1784 } | |
| 1785 dest[dest_index++] = ';'; | |
| 1786 dest[dest_index] = '\0'; | |
| 1787 return dest; | |
| 1788 } | |
| 1789 | |
| 1790 // different verisons of is_same_class_package | |
| 1791 bool instanceKlass::is_same_class_package(klassOop class2) { | |
| 1792 klassOop class1 = as_klassOop(); | |
| 1793 oop classloader1 = instanceKlass::cast(class1)->class_loader(); | |
| 1794 symbolOop classname1 = Klass::cast(class1)->name(); | |
| 1795 | |
| 1796 if (Klass::cast(class2)->oop_is_objArray()) { | |
| 1797 class2 = objArrayKlass::cast(class2)->bottom_klass(); | |
| 1798 } | |
| 1799 oop classloader2; | |
| 1800 if (Klass::cast(class2)->oop_is_instance()) { | |
| 1801 classloader2 = instanceKlass::cast(class2)->class_loader(); | |
| 1802 } else { | |
| 1803 assert(Klass::cast(class2)->oop_is_typeArray(), "should be type array"); | |
| 1804 classloader2 = NULL; | |
| 1805 } | |
| 1806 symbolOop classname2 = Klass::cast(class2)->name(); | |
| 1807 | |
| 1808 return instanceKlass::is_same_class_package(classloader1, classname1, | |
| 1809 classloader2, classname2); | |
| 1810 } | |
| 1811 | |
| 1812 bool instanceKlass::is_same_class_package(oop classloader2, symbolOop classname2) { | |
| 1813 klassOop class1 = as_klassOop(); | |
| 1814 oop classloader1 = instanceKlass::cast(class1)->class_loader(); | |
| 1815 symbolOop classname1 = Klass::cast(class1)->name(); | |
| 1816 | |
| 1817 return instanceKlass::is_same_class_package(classloader1, classname1, | |
| 1818 classloader2, classname2); | |
| 1819 } | |
| 1820 | |
| 1821 // return true if two classes are in the same package, classloader | |
| 1822 // and classname information is enough to determine a class's package | |
| 1823 bool instanceKlass::is_same_class_package(oop class_loader1, symbolOop class_name1, | |
| 1824 oop class_loader2, symbolOop class_name2) { | |
| 1825 if (class_loader1 != class_loader2) { | |
| 1826 return false; | |
|
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1827 } else if (class_name1 == class_name2) { |
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1828 return true; // skip painful bytewise comparison |
| 0 | 1829 } else { |
| 1830 ResourceMark rm; | |
| 1831 | |
| 1832 // The symbolOop's are in UTF8 encoding. Since we only need to check explicitly | |
| 1833 // for ASCII characters ('/', 'L', '['), we can keep them in UTF8 encoding. | |
| 1834 // Otherwise, we just compare jbyte values between the strings. | |
| 1835 jbyte *name1 = class_name1->base(); | |
| 1836 jbyte *name2 = class_name2->base(); | |
| 1837 | |
| 1838 jbyte *last_slash1 = UTF8::strrchr(name1, class_name1->utf8_length(), '/'); | |
| 1839 jbyte *last_slash2 = UTF8::strrchr(name2, class_name2->utf8_length(), '/'); | |
| 1840 | |
| 1841 if ((last_slash1 == NULL) || (last_slash2 == NULL)) { | |
| 1842 // One of the two doesn't have a package. Only return true | |
| 1843 // if the other one also doesn't have a package. | |
| 1844 return last_slash1 == last_slash2; | |
| 1845 } else { | |
| 1846 // Skip over '['s | |
| 1847 if (*name1 == '[') { | |
| 1848 do { | |
| 1849 name1++; | |
| 1850 } while (*name1 == '['); | |
| 1851 if (*name1 != 'L') { | |
| 1852 // Something is terribly wrong. Shouldn't be here. | |
| 1853 return false; | |
| 1854 } | |
| 1855 } | |
| 1856 if (*name2 == '[') { | |
| 1857 do { | |
| 1858 name2++; | |
| 1859 } while (*name2 == '['); | |
| 1860 if (*name2 != 'L') { | |
| 1861 // Something is terribly wrong. Shouldn't be here. | |
| 1862 return false; | |
| 1863 } | |
| 1864 } | |
| 1865 | |
| 1866 // Check that package part is identical | |
| 1867 int length1 = last_slash1 - name1; | |
| 1868 int length2 = last_slash2 - name2; | |
| 1869 | |
| 1870 return UTF8::equal(name1, length1, name2, length2); | |
| 1871 } | |
| 1872 } | |
| 1873 } | |
| 1874 | |
|
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1875 // Returns true iff super_method can be overridden by a method in targetclassname |
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1876 // See JSL 3rd edition 8.4.6.1 |
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1877 // Assumes name-signature match |
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1878 // "this" is instanceKlass of super_method which must exist |
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1879 // note that the instanceKlass of the method in the targetclassname has not always been created yet |
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1880 bool instanceKlass::is_override(methodHandle super_method, Handle targetclassloader, symbolHandle targetclassname, TRAPS) { |
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1881 // Private methods can not be overridden |
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1882 if (super_method->is_private()) { |
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1883 return false; |
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1884 } |
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1885 // If super method is accessible, then override |
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1886 if ((super_method->is_protected()) || |
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1887 (super_method->is_public())) { |
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1888 return true; |
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1889 } |
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1890 // Package-private methods are not inherited outside of package |
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1891 assert(super_method->is_package_private(), "must be package private"); |
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1892 return(is_same_class_package(targetclassloader(), targetclassname())); |
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1893 } |
| 0 | 1894 |
|
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1895 /* defined for now in jvm.cpp, for historical reasons *-- |
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1896 klassOop instanceKlass::compute_enclosing_class_impl(instanceKlassHandle self, |
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1897 symbolOop& simple_name_result, TRAPS) { |
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1898 ... |
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1899 } |
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1900 */ |
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1901 |
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1902 // tell if two classes have the same enclosing class (at package level) |
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1903 bool instanceKlass::is_same_package_member_impl(instanceKlassHandle class1, |
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1904 klassOop class2_oop, TRAPS) { |
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1905 if (class2_oop == class1->as_klassOop()) return true; |
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1906 if (!Klass::cast(class2_oop)->oop_is_instance()) return false; |
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1907 instanceKlassHandle class2(THREAD, class2_oop); |
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1908 |
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1909 // must be in same package before we try anything else |
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1910 if (!class1->is_same_class_package(class2->class_loader(), class2->name())) |
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1911 return false; |
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1912 |
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1913 // As long as there is an outer1.getEnclosingClass, |
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1914 // shift the search outward. |
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1915 instanceKlassHandle outer1 = class1; |
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1916 for (;;) { |
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1917 // As we walk along, look for equalities between outer1 and class2. |
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1918 // Eventually, the walks will terminate as outer1 stops |
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1919 // at the top-level class around the original class. |
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1920 symbolOop ignore_name; |
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1921 klassOop next = outer1->compute_enclosing_class(ignore_name, CHECK_false); |
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1922 if (next == NULL) break; |
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1923 if (next == class2()) return true; |
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1924 outer1 = instanceKlassHandle(THREAD, next); |
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1925 } |
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1926 |
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1927 // Now do the same for class2. |
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1928 instanceKlassHandle outer2 = class2; |
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1929 for (;;) { |
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1930 symbolOop ignore_name; |
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1931 klassOop next = outer2->compute_enclosing_class(ignore_name, CHECK_false); |
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1932 if (next == NULL) break; |
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1933 // Might as well check the new outer against all available values. |
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1934 if (next == class1()) return true; |
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1935 if (next == outer1()) return true; |
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1936 outer2 = instanceKlassHandle(THREAD, next); |
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1937 } |
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1938 |
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1939 // If by this point we have not found an equality between the |
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1940 // two classes, we know they are in separate package members. |
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1941 return false; |
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1942 } |
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1943 |
| 0 | 1944 |
| 1945 jint instanceKlass::compute_modifier_flags(TRAPS) const { | |
| 1946 klassOop k = as_klassOop(); | |
| 1947 jint access = access_flags().as_int(); | |
| 1948 | |
| 1949 // But check if it happens to be member class. | |
| 1950 typeArrayOop inner_class_list = inner_classes(); | |
| 1951 int length = (inner_class_list == NULL) ? 0 : inner_class_list->length(); | |
| 1952 assert (length % instanceKlass::inner_class_next_offset == 0, "just checking"); | |
| 1953 if (length > 0) { | |
| 1954 typeArrayHandle inner_class_list_h(THREAD, inner_class_list); | |
| 1955 instanceKlassHandle ik(THREAD, k); | |
| 1956 for (int i = 0; i < length; i += instanceKlass::inner_class_next_offset) { | |
| 1957 int ioff = inner_class_list_h->ushort_at( | |
| 1958 i + instanceKlass::inner_class_inner_class_info_offset); | |
| 1959 | |
| 1960 // Inner class attribute can be zero, skip it. | |
| 1961 // Strange but true: JVM spec. allows null inner class refs. | |
| 1962 if (ioff == 0) continue; | |
| 1963 | |
| 1964 // only look at classes that are already loaded | |
| 1965 // since we are looking for the flags for our self. | |
| 1966 symbolOop inner_name = ik->constants()->klass_name_at(ioff); | |
| 1967 if ((ik->name() == inner_name)) { | |
| 1968 // This is really a member class. | |
| 1969 access = inner_class_list_h->ushort_at(i + instanceKlass::inner_class_access_flags_offset); | |
| 1970 break; | |
| 1971 } | |
| 1972 } | |
| 1973 } | |
| 1974 // Remember to strip ACC_SUPER bit | |
| 1975 return (access & (~JVM_ACC_SUPER)) & JVM_ACC_WRITTEN_FLAGS; | |
| 1976 } | |
| 1977 | |
| 1978 jint instanceKlass::jvmti_class_status() const { | |
| 1979 jint result = 0; | |
| 1980 | |
| 1981 if (is_linked()) { | |
| 1982 result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED; | |
| 1983 } | |
| 1984 | |
| 1985 if (is_initialized()) { | |
| 1986 assert(is_linked(), "Class status is not consistent"); | |
| 1987 result |= JVMTI_CLASS_STATUS_INITIALIZED; | |
| 1988 } | |
| 1989 if (is_in_error_state()) { | |
| 1990 result |= JVMTI_CLASS_STATUS_ERROR; | |
| 1991 } | |
| 1992 return result; | |
| 1993 } | |
| 1994 | |
| 1995 methodOop instanceKlass::method_at_itable(klassOop holder, int index, TRAPS) { | |
| 1996 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable(); | |
| 1997 int method_table_offset_in_words = ioe->offset()/wordSize; | |
| 1998 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words()) | |
| 1999 / itableOffsetEntry::size(); | |
| 2000 | |
| 2001 for (int cnt = 0 ; ; cnt ++, ioe ++) { | |
| 605 | 2002 // If the interface isn't implemented by the receiver class, |
| 0 | 2003 // the VM should throw IncompatibleClassChangeError. |
| 2004 if (cnt >= nof_interfaces) { | |
| 2005 THROW_OOP_0(vmSymbols::java_lang_IncompatibleClassChangeError()); | |
| 2006 } | |
| 2007 | |
| 2008 klassOop ik = ioe->interface_klass(); | |
| 2009 if (ik == holder) break; | |
| 2010 } | |
| 2011 | |
| 2012 itableMethodEntry* ime = ioe->first_method_entry(as_klassOop()); | |
| 2013 methodOop m = ime[index].method(); | |
| 2014 if (m == NULL) { | |
| 2015 THROW_OOP_0(vmSymbols::java_lang_AbstractMethodError()); | |
| 2016 } | |
| 2017 return m; | |
| 2018 } | |
| 2019 | |
| 2020 // On-stack replacement stuff | |
| 2021 void instanceKlass::add_osr_nmethod(nmethod* n) { | |
| 2022 // only one compilation can be active | |
| 2023 NEEDS_CLEANUP | |
| 2024 // This is a short non-blocking critical region, so the no safepoint check is ok. | |
| 2025 OsrList_lock->lock_without_safepoint_check(); | |
| 2026 assert(n->is_osr_method(), "wrong kind of nmethod"); | |
| 2027 n->set_link(osr_nmethods_head()); | |
| 2028 set_osr_nmethods_head(n); | |
| 2029 // Remember to unlock again | |
| 2030 OsrList_lock->unlock(); | |
| 2031 } | |
| 2032 | |
| 2033 | |
| 2034 void instanceKlass::remove_osr_nmethod(nmethod* n) { | |
| 2035 // This is a short non-blocking critical region, so the no safepoint check is ok. | |
| 2036 OsrList_lock->lock_without_safepoint_check(); | |
| 2037 assert(n->is_osr_method(), "wrong kind of nmethod"); | |
| 2038 nmethod* last = NULL; | |
| 2039 nmethod* cur = osr_nmethods_head(); | |
| 2040 // Search for match | |
| 2041 while(cur != NULL && cur != n) { | |
| 2042 last = cur; | |
| 2043 cur = cur->link(); | |
| 2044 } | |
| 2045 if (cur == n) { | |
| 2046 if (last == NULL) { | |
| 2047 // Remove first element | |
| 2048 set_osr_nmethods_head(osr_nmethods_head()->link()); | |
| 2049 } else { | |
| 2050 last->set_link(cur->link()); | |
| 2051 } | |
| 2052 } | |
| 2053 n->set_link(NULL); | |
| 2054 // Remember to unlock again | |
| 2055 OsrList_lock->unlock(); | |
| 2056 } | |
| 2057 | |
| 2058 nmethod* instanceKlass::lookup_osr_nmethod(const methodOop m, int bci) const { | |
| 2059 // This is a short non-blocking critical region, so the no safepoint check is ok. | |
| 2060 OsrList_lock->lock_without_safepoint_check(); | |
| 2061 nmethod* osr = osr_nmethods_head(); | |
| 2062 while (osr != NULL) { | |
| 2063 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain"); | |
| 2064 if (osr->method() == m && | |
| 2065 (bci == InvocationEntryBci || osr->osr_entry_bci() == bci)) { | |
| 2066 // Found a match - return it. | |
| 2067 OsrList_lock->unlock(); | |
| 2068 return osr; | |
| 2069 } | |
| 2070 osr = osr->link(); | |
| 2071 } | |
| 2072 OsrList_lock->unlock(); | |
| 2073 return NULL; | |
| 2074 } | |
| 2075 | |
| 2076 // ----------------------------------------------------------------------------------------------------- | |
| 2077 #ifndef PRODUCT | |
| 2078 | |
| 2079 // Printing | |
| 2080 | |
|
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2081 #define BULLET " - " |
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2082 |
| 0 | 2083 void FieldPrinter::do_field(fieldDescriptor* fd) { |
|
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2084 _st->print(BULLET); |
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2085 if (fd->is_static() || (_obj == NULL)) { |
| 0 | 2086 fd->print_on(_st); |
| 2087 _st->cr(); | |
| 2088 } else { | |
| 2089 fd->print_on_for(_st, _obj); | |
| 2090 _st->cr(); | |
| 2091 } | |
| 2092 } | |
| 2093 | |
| 2094 | |
| 2095 void instanceKlass::oop_print_on(oop obj, outputStream* st) { | |
| 2096 Klass::oop_print_on(obj, st); | |
| 2097 | |
| 2098 if (as_klassOop() == SystemDictionary::string_klass()) { | |
| 2099 typeArrayOop value = java_lang_String::value(obj); | |
| 2100 juint offset = java_lang_String::offset(obj); | |
| 2101 juint length = java_lang_String::length(obj); | |
| 2102 if (value != NULL && | |
| 2103 value->is_typeArray() && | |
| 2104 offset <= (juint) value->length() && | |
| 2105 offset + length <= (juint) value->length()) { | |
|
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2106 st->print(BULLET"string: "); |
| 0 | 2107 Handle h_obj(obj); |
| 2108 java_lang_String::print(h_obj, st); | |
| 2109 st->cr(); | |
| 2110 if (!WizardMode) return; // that is enough | |
| 2111 } | |
| 2112 } | |
| 2113 | |
|
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2114 st->print_cr(BULLET"---- fields (total size %d words):", oop_size(obj)); |
| 0 | 2115 FieldPrinter print_nonstatic_field(st, obj); |
| 2116 do_nonstatic_fields(&print_nonstatic_field); | |
| 2117 | |
| 2118 if (as_klassOop() == SystemDictionary::class_klass()) { | |
|
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2119 st->print(BULLET"signature: "); |
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2120 java_lang_Class::print_signature(obj, st); |
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2121 st->cr(); |
| 0 | 2122 klassOop mirrored_klass = java_lang_Class::as_klassOop(obj); |
|
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2123 st->print(BULLET"fake entry for mirror: "); |
| 0 | 2124 mirrored_klass->print_value_on(st); |
| 2125 st->cr(); | |
|
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2126 st->print(BULLET"fake entry resolved_constructor: "); |
| 0 | 2127 methodOop ctor = java_lang_Class::resolved_constructor(obj); |
| 2128 ctor->print_value_on(st); | |
| 2129 klassOop array_klass = java_lang_Class::array_klass(obj); | |
|
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2130 st->cr(); |
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2131 st->print(BULLET"fake entry for array: "); |
| 0 | 2132 array_klass->print_value_on(st); |
| 2133 st->cr(); | |
| 2134 } | |
| 2135 } | |
| 2136 | |
| 2137 void instanceKlass::oop_print_value_on(oop obj, outputStream* st) { | |
| 2138 st->print("a "); | |
| 2139 name()->print_value_on(st); | |
| 2140 obj->print_address_on(st); | |
|
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2141 if (as_klassOop() == SystemDictionary::string_klass() |
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2142 && java_lang_String::value(obj) != NULL) { |
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2143 ResourceMark rm; |
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2144 int len = java_lang_String::length(obj); |
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2145 int plen = (len < 24 ? len : 12); |
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2146 char* str = java_lang_String::as_utf8_string(obj, 0, plen); |
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2147 st->print(" = \"%s\"", str); |
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2148 if (len > plen) |
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2149 st->print("...[%d]", len); |
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2150 } else if (as_klassOop() == SystemDictionary::class_klass()) { |
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2151 klassOop k = java_lang_Class::as_klassOop(obj); |
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2152 st->print(" = "); |
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2153 if (k != NULL) { |
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2154 k->print_value_on(st); |
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2155 } else { |
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2156 const char* tname = type2name(java_lang_Class::primitive_type(obj)); |
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2157 st->print("%s", tname ? tname : "type?"); |
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2158 } |
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2159 } else if (java_lang_boxing_object::is_instance(obj)) { |
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2160 st->print(" = "); |
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2161 java_lang_boxing_object::print(obj, st); |
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2162 } |
| 0 | 2163 } |
| 2164 | |
|
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2165 #endif // ndef PRODUCT |
| 0 | 2166 |
| 2167 const char* instanceKlass::internal_name() const { | |
| 2168 return external_name(); | |
| 2169 } | |
| 2170 | |
| 2171 // Verification | |
| 2172 | |
| 2173 class VerifyFieldClosure: public OopClosure { | |
|
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2174 protected: |
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2175 template <class T> void do_oop_work(T* p) { |
| 0 | 2176 guarantee(Universe::heap()->is_in_closed_subset(p), "should be in heap"); |
|
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2177 oop obj = oopDesc::load_decode_heap_oop(p); |
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2178 if (!obj->is_oop_or_null()) { |
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2179 tty->print_cr("Failed: " PTR_FORMAT " -> " PTR_FORMAT, p, (address)obj); |
| 0 | 2180 Universe::print(); |
| 2181 guarantee(false, "boom"); | |
| 2182 } | |
| 2183 } | |
|
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2184 public: |
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2185 virtual void do_oop(oop* p) { VerifyFieldClosure::do_oop_work(p); } |
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2186 virtual void do_oop(narrowOop* p) { VerifyFieldClosure::do_oop_work(p); } |
| 0 | 2187 }; |
| 2188 | |
| 2189 void instanceKlass::oop_verify_on(oop obj, outputStream* st) { | |
| 2190 Klass::oop_verify_on(obj, st); | |
| 2191 VerifyFieldClosure blk; | |
| 2192 oop_oop_iterate(obj, &blk); | |
| 2193 } | |
| 2194 | |
| 2195 #ifndef PRODUCT | |
| 2196 | |
| 2197 void instanceKlass::verify_class_klass_nonstatic_oop_maps(klassOop k) { | |
| 2198 // This verification code is disabled. JDK_Version::is_gte_jdk14x_version() | |
| 2199 // cannot be called since this function is called before the VM is | |
| 2200 // able to determine what JDK version is running with. | |
| 2201 // The check below always is false since 1.4. | |
| 2202 return; | |
| 2203 | |
| 2204 // This verification code temporarily disabled for the 1.4 | |
| 2205 // reflection implementation since java.lang.Class now has | |
| 2206 // Java-level instance fields. Should rewrite this to handle this | |
| 2207 // case. | |
| 2208 if (!(JDK_Version::is_gte_jdk14x_version() && UseNewReflection)) { | |
| 2209 // Verify that java.lang.Class instances have a fake oop field added. | |
| 2210 instanceKlass* ik = instanceKlass::cast(k); | |
| 2211 | |
| 2212 // Check that we have the right class | |
| 2213 static bool first_time = true; | |
| 2214 guarantee(k == SystemDictionary::class_klass() && first_time, "Invalid verify of maps"); | |
| 2215 first_time = false; | |
| 2216 const int extra = java_lang_Class::number_of_fake_oop_fields; | |
| 2217 guarantee(ik->nonstatic_field_size() == extra, "just checking"); | |
| 2218 guarantee(ik->nonstatic_oop_map_size() == 1, "just checking"); | |
| 2219 guarantee(ik->size_helper() == align_object_size(instanceOopDesc::header_size() + extra), "just checking"); | |
| 2220 | |
| 2221 // Check that the map is (2,extra) | |
| 2222 int offset = java_lang_Class::klass_offset; | |
| 2223 | |
| 2224 OopMapBlock* map = ik->start_of_nonstatic_oop_maps(); | |
| 2225 guarantee(map->offset() == offset && map->length() == extra, "just checking"); | |
| 2226 } | |
| 2227 } | |
| 2228 | |
|
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2229 #endif // ndef PRODUCT |
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2230 |
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2231 // JNIid class for jfieldIDs only |
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2232 // Note to reviewers: |
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2233 // These JNI functions are just moved over to column 1 and not changed |
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2234 // in the compressed oops workspace. |
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2235 JNIid::JNIid(klassOop holder, int offset, JNIid* next) { |
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2236 _holder = holder; |
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2237 _offset = offset; |
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2238 _next = next; |
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2239 debug_only(_is_static_field_id = false;) |
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2240 } |
| 0 | 2241 |
| 2242 | |
|
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2243 JNIid* JNIid::find(int offset) { |
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2244 JNIid* current = this; |
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2245 while (current != NULL) { |
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2246 if (current->offset() == offset) return current; |
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2247 current = current->next(); |
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2248 } |
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2249 return NULL; |
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2250 } |
| 0 | 2251 |
| 2252 void JNIid::oops_do(OopClosure* f) { | |
| 2253 for (JNIid* cur = this; cur != NULL; cur = cur->next()) { | |
| 2254 f->do_oop(cur->holder_addr()); | |
| 2255 } | |
| 2256 } | |
| 2257 | |
| 2258 void JNIid::deallocate(JNIid* current) { | |
|
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2259 while (current != NULL) { |
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2260 JNIid* next = current->next(); |
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2261 delete current; |
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2262 current = next; |
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2263 } |
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2264 } |
| 0 | 2265 |
| 2266 | |
|
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2267 void JNIid::verify(klassOop holder) { |
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2268 int first_field_offset = instanceKlass::cast(holder)->offset_of_static_fields(); |
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2269 int end_field_offset; |
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2270 end_field_offset = first_field_offset + (instanceKlass::cast(holder)->static_field_size() * wordSize); |
| 0 | 2271 |
|
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2272 JNIid* current = this; |
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2273 while (current != NULL) { |
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2274 guarantee(current->holder() == holder, "Invalid klass in JNIid"); |
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2275 #ifdef ASSERT |
|
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2276 int o = current->offset(); |
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2277 if (current->is_static_field_id()) { |
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2278 guarantee(o >= first_field_offset && o < end_field_offset, "Invalid static field offset in JNIid"); |
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2279 } |
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2280 #endif |
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2281 current = current->next(); |
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2282 } |
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2283 } |
| 0 | 2284 |
| 2285 | |
| 2286 #ifdef ASSERT | |
|
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2287 void instanceKlass::set_init_state(ClassState state) { |
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2288 bool good_state = as_klassOop()->is_shared() ? (_init_state <= state) |
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2289 : (_init_state < state); |
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2290 assert(good_state || state == allocated, "illegal state transition"); |
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2291 _init_state = state; |
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2292 } |
| 0 | 2293 #endif |
| 2294 | |
| 2295 | |
| 2296 // RedefineClasses() support for previous versions: | |
| 2297 | |
| 2298 // Add an information node that contains weak references to the | |
| 2299 // interesting parts of the previous version of the_class. | |
| 2300 void instanceKlass::add_previous_version(instanceKlassHandle ikh, | |
|
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2301 BitMap* emcp_methods, int emcp_method_count) { |
| 0 | 2302 assert(Thread::current()->is_VM_thread(), |
|
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2303 "only VMThread can add previous versions"); |
| 0 | 2304 |
| 2305 if (_previous_versions == NULL) { | |
| 2306 // This is the first previous version so make some space. | |
| 2307 // Start with 2 elements under the assumption that the class | |
| 2308 // won't be redefined much. | |
| 2309 _previous_versions = new (ResourceObj::C_HEAP) | |
| 2310 GrowableArray<PreviousVersionNode *>(2, true); | |
| 2311 } | |
| 2312 | |
| 2313 // RC_TRACE macro has an embedded ResourceMark | |
| 2314 RC_TRACE(0x00000100, ("adding previous version ref for %s @%d, EMCP_cnt=%d", | |
| 2315 ikh->external_name(), _previous_versions->length(), emcp_method_count)); | |
| 2316 constantPoolHandle cp_h(ikh->constants()); | |
|
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|
2317 jobject cp_ref; |
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2318 if (cp_h->is_shared()) { |
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2319 // a shared ConstantPool requires a regular reference; a weak |
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2320 // reference would be collectible |
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2321 cp_ref = JNIHandles::make_global(cp_h); |
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2322 } else { |
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2323 cp_ref = JNIHandles::make_weak_global(cp_h); |
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2324 } |
| 0 | 2325 PreviousVersionNode * pv_node = NULL; |
| 2326 objArrayOop old_methods = ikh->methods(); | |
| 2327 | |
| 2328 if (emcp_method_count == 0) { | |
|
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2329 // non-shared ConstantPool gets a weak reference |
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2330 pv_node = new PreviousVersionNode(cp_ref, !cp_h->is_shared(), NULL); |
| 0 | 2331 RC_TRACE(0x00000400, |
| 2332 ("add: all methods are obsolete; flushing any EMCP weak refs")); | |
| 2333 } else { | |
| 2334 int local_count = 0; | |
| 2335 GrowableArray<jweak>* method_refs = new (ResourceObj::C_HEAP) | |
| 2336 GrowableArray<jweak>(emcp_method_count, true); | |
| 2337 for (int i = 0; i < old_methods->length(); i++) { | |
| 2338 if (emcp_methods->at(i)) { | |
| 2339 // this old method is EMCP so save a weak ref | |
| 2340 methodOop old_method = (methodOop) old_methods->obj_at(i); | |
| 2341 methodHandle old_method_h(old_method); | |
| 2342 jweak method_ref = JNIHandles::make_weak_global(old_method_h); | |
| 2343 method_refs->append(method_ref); | |
| 2344 if (++local_count >= emcp_method_count) { | |
| 2345 // no more EMCP methods so bail out now | |
| 2346 break; | |
| 2347 } | |
| 2348 } | |
| 2349 } | |
|
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2350 // non-shared ConstantPool gets a weak reference |
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2351 pv_node = new PreviousVersionNode(cp_ref, !cp_h->is_shared(), method_refs); |
| 0 | 2352 } |
| 2353 | |
| 2354 _previous_versions->append(pv_node); | |
| 2355 | |
| 2356 // Using weak references allows the interesting parts of previous | |
| 2357 // classes to be GC'ed when they are no longer needed. Since the | |
| 2358 // caller is the VMThread and we are at a safepoint, this is a good | |
| 2359 // time to clear out unused weak references. | |
| 2360 | |
| 2361 RC_TRACE(0x00000400, ("add: previous version length=%d", | |
| 2362 _previous_versions->length())); | |
| 2363 | |
| 2364 // skip the last entry since we just added it | |
| 2365 for (int i = _previous_versions->length() - 2; i >= 0; i--) { | |
| 2366 // check the previous versions array for a GC'ed weak refs | |
| 2367 pv_node = _previous_versions->at(i); | |
| 2368 cp_ref = pv_node->prev_constant_pool(); | |
|
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2369 assert(cp_ref != NULL, "cp ref was unexpectedly cleared"); |
| 0 | 2370 if (cp_ref == NULL) { |
| 2371 delete pv_node; | |
| 2372 _previous_versions->remove_at(i); | |
| 2373 // Since we are traversing the array backwards, we don't have to | |
| 2374 // do anything special with the index. | |
| 2375 continue; // robustness | |
| 2376 } | |
| 2377 | |
| 2378 constantPoolOop cp = (constantPoolOop)JNIHandles::resolve(cp_ref); | |
| 2379 if (cp == NULL) { | |
| 2380 // this entry has been GC'ed so remove it | |
| 2381 delete pv_node; | |
| 2382 _previous_versions->remove_at(i); | |
| 2383 // Since we are traversing the array backwards, we don't have to | |
| 2384 // do anything special with the index. | |
| 2385 continue; | |
| 2386 } else { | |
| 2387 RC_TRACE(0x00000400, ("add: previous version @%d is alive", i)); | |
| 2388 } | |
| 2389 | |
| 2390 GrowableArray<jweak>* method_refs = pv_node->prev_EMCP_methods(); | |
| 2391 if (method_refs != NULL) { | |
| 2392 RC_TRACE(0x00000400, ("add: previous methods length=%d", | |
| 2393 method_refs->length())); | |
| 2394 for (int j = method_refs->length() - 1; j >= 0; j--) { | |
| 2395 jweak method_ref = method_refs->at(j); | |
| 2396 assert(method_ref != NULL, "weak method ref was unexpectedly cleared"); | |
| 2397 if (method_ref == NULL) { | |
| 2398 method_refs->remove_at(j); | |
| 2399 // Since we are traversing the array backwards, we don't have to | |
| 2400 // do anything special with the index. | |
| 2401 continue; // robustness | |
| 2402 } | |
| 2403 | |
| 2404 methodOop method = (methodOop)JNIHandles::resolve(method_ref); | |
| 2405 if (method == NULL || emcp_method_count == 0) { | |
| 2406 // This method entry has been GC'ed or the current | |
| 2407 // RedefineClasses() call has made all methods obsolete | |
| 2408 // so remove it. | |
| 2409 JNIHandles::destroy_weak_global(method_ref); | |
| 2410 method_refs->remove_at(j); | |
| 2411 } else { | |
| 2412 // RC_TRACE macro has an embedded ResourceMark | |
| 2413 RC_TRACE(0x00000400, | |
| 2414 ("add: %s(%s): previous method @%d in version @%d is alive", | |
| 2415 method->name()->as_C_string(), method->signature()->as_C_string(), | |
| 2416 j, i)); | |
| 2417 } | |
| 2418 } | |
| 2419 } | |
| 2420 } | |
| 2421 | |
| 2422 int obsolete_method_count = old_methods->length() - emcp_method_count; | |
| 2423 | |
| 2424 if (emcp_method_count != 0 && obsolete_method_count != 0 && | |
| 2425 _previous_versions->length() > 1) { | |
| 2426 // We have a mix of obsolete and EMCP methods. If there is more | |
| 2427 // than the previous version that we just added, then we have to | |
| 2428 // clear out any matching EMCP method entries the hard way. | |
| 2429 int local_count = 0; | |
| 2430 for (int i = 0; i < old_methods->length(); i++) { | |
| 2431 if (!emcp_methods->at(i)) { | |
| 2432 // only obsolete methods are interesting | |
| 2433 methodOop old_method = (methodOop) old_methods->obj_at(i); | |
| 2434 symbolOop m_name = old_method->name(); | |
| 2435 symbolOop m_signature = old_method->signature(); | |
| 2436 | |
| 2437 // skip the last entry since we just added it | |
| 2438 for (int j = _previous_versions->length() - 2; j >= 0; j--) { | |
| 2439 // check the previous versions array for a GC'ed weak refs | |
| 2440 pv_node = _previous_versions->at(j); | |
| 2441 cp_ref = pv_node->prev_constant_pool(); | |
|
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2442 assert(cp_ref != NULL, "cp ref was unexpectedly cleared"); |
| 0 | 2443 if (cp_ref == NULL) { |
| 2444 delete pv_node; | |
| 2445 _previous_versions->remove_at(j); | |
| 2446 // Since we are traversing the array backwards, we don't have to | |
| 2447 // do anything special with the index. | |
| 2448 continue; // robustness | |
| 2449 } | |
| 2450 | |
| 2451 constantPoolOop cp = (constantPoolOop)JNIHandles::resolve(cp_ref); | |
| 2452 if (cp == NULL) { | |
| 2453 // this entry has been GC'ed so remove it | |
| 2454 delete pv_node; | |
| 2455 _previous_versions->remove_at(j); | |
| 2456 // Since we are traversing the array backwards, we don't have to | |
| 2457 // do anything special with the index. | |
| 2458 continue; | |
| 2459 } | |
| 2460 | |
| 2461 GrowableArray<jweak>* method_refs = pv_node->prev_EMCP_methods(); | |
| 2462 if (method_refs == NULL) { | |
| 2463 // We have run into a PreviousVersion generation where | |
| 2464 // all methods were made obsolete during that generation's | |
| 2465 // RedefineClasses() operation. At the time of that | |
| 2466 // operation, all EMCP methods were flushed so we don't | |
| 2467 // have to go back any further. | |
| 2468 // | |
| 2469 // A NULL method_refs is different than an empty method_refs. | |
| 2470 // We cannot infer any optimizations about older generations | |
| 2471 // from an empty method_refs for the current generation. | |
| 2472 break; | |
| 2473 } | |
| 2474 | |
| 2475 for (int k = method_refs->length() - 1; k >= 0; k--) { | |
| 2476 jweak method_ref = method_refs->at(k); | |
| 2477 assert(method_ref != NULL, | |
| 2478 "weak method ref was unexpectedly cleared"); | |
| 2479 if (method_ref == NULL) { | |
| 2480 method_refs->remove_at(k); | |
| 2481 // Since we are traversing the array backwards, we don't | |
| 2482 // have to do anything special with the index. | |
| 2483 continue; // robustness | |
| 2484 } | |
| 2485 | |
| 2486 methodOop method = (methodOop)JNIHandles::resolve(method_ref); | |
| 2487 if (method == NULL) { | |
| 2488 // this method entry has been GC'ed so skip it | |
| 2489 JNIHandles::destroy_weak_global(method_ref); | |
| 2490 method_refs->remove_at(k); | |
| 2491 continue; | |
| 2492 } | |
| 2493 | |
| 2494 if (method->name() == m_name && | |
| 2495 method->signature() == m_signature) { | |
| 2496 // The current RedefineClasses() call has made all EMCP | |
| 2497 // versions of this method obsolete so mark it as obsolete | |
| 2498 // and remove the weak ref. | |
| 2499 RC_TRACE(0x00000400, | |
| 2500 ("add: %s(%s): flush obsolete method @%d in version @%d", | |
| 2501 m_name->as_C_string(), m_signature->as_C_string(), k, j)); | |
| 2502 | |
| 2503 method->set_is_obsolete(); | |
| 2504 JNIHandles::destroy_weak_global(method_ref); | |
| 2505 method_refs->remove_at(k); | |
| 2506 break; | |
| 2507 } | |
| 2508 } | |
| 2509 | |
| 2510 // The previous loop may not find a matching EMCP method, but | |
| 2511 // that doesn't mean that we can optimize and not go any | |
| 2512 // further back in the PreviousVersion generations. The EMCP | |
| 2513 // method for this generation could have already been GC'ed, | |
| 2514 // but there still may be an older EMCP method that has not | |
| 2515 // been GC'ed. | |
| 2516 } | |
| 2517 | |
| 2518 if (++local_count >= obsolete_method_count) { | |
| 2519 // no more obsolete methods so bail out now | |
| 2520 break; | |
| 2521 } | |
| 2522 } | |
| 2523 } | |
| 2524 } | |
| 2525 } // end add_previous_version() | |
| 2526 | |
| 2527 | |
| 2528 // Determine if instanceKlass has a previous version. | |
| 2529 bool instanceKlass::has_previous_version() const { | |
| 2530 if (_previous_versions == NULL) { | |
| 2531 // no previous versions array so answer is easy | |
| 2532 return false; | |
| 2533 } | |
| 2534 | |
| 2535 for (int i = _previous_versions->length() - 1; i >= 0; i--) { | |
| 2536 // Check the previous versions array for an info node that hasn't | |
| 2537 // been GC'ed | |
| 2538 PreviousVersionNode * pv_node = _previous_versions->at(i); | |
| 2539 | |
|
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2540 jobject cp_ref = pv_node->prev_constant_pool(); |
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2541 assert(cp_ref != NULL, "cp reference was unexpectedly cleared"); |
| 0 | 2542 if (cp_ref == NULL) { |
| 2543 continue; // robustness | |
| 2544 } | |
| 2545 | |
| 2546 constantPoolOop cp = (constantPoolOop)JNIHandles::resolve(cp_ref); | |
| 2547 if (cp != NULL) { | |
| 2548 // we have at least one previous version | |
| 2549 return true; | |
| 2550 } | |
| 2551 | |
| 2552 // We don't have to check the method refs. If the constant pool has | |
| 2553 // been GC'ed then so have the methods. | |
| 2554 } | |
| 2555 | |
| 2556 // all of the underlying nodes' info has been GC'ed | |
| 2557 return false; | |
| 2558 } // end has_previous_version() | |
| 2559 | |
| 2560 methodOop instanceKlass::method_with_idnum(int idnum) { | |
| 2561 methodOop m = NULL; | |
| 2562 if (idnum < methods()->length()) { | |
| 2563 m = (methodOop) methods()->obj_at(idnum); | |
| 2564 } | |
| 2565 if (m == NULL || m->method_idnum() != idnum) { | |
| 2566 for (int index = 0; index < methods()->length(); ++index) { | |
| 2567 m = (methodOop) methods()->obj_at(index); | |
| 2568 if (m->method_idnum() == idnum) { | |
| 2569 return m; | |
| 2570 } | |
| 2571 } | |
| 2572 } | |
| 2573 return m; | |
| 2574 } | |
| 2575 | |
| 2576 | |
| 2577 // Set the annotation at 'idnum' to 'anno'. | |
| 2578 // We don't want to create or extend the array if 'anno' is NULL, since that is the | |
| 2579 // default value. However, if the array exists and is long enough, we must set NULL values. | |
| 2580 void instanceKlass::set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p) { | |
| 2581 objArrayOop md = *md_p; | |
| 2582 if (md != NULL && md->length() > idnum) { | |
| 2583 md->obj_at_put(idnum, anno); | |
| 2584 } else if (anno != NULL) { | |
| 2585 // create the array | |
| 2586 int length = MAX2(idnum+1, (int)_idnum_allocated_count); | |
| 2587 md = oopFactory::new_system_objArray(length, Thread::current()); | |
| 2588 if (*md_p != NULL) { | |
| 2589 // copy the existing entries | |
| 2590 for (int index = 0; index < (*md_p)->length(); index++) { | |
| 2591 md->obj_at_put(index, (*md_p)->obj_at(index)); | |
| 2592 } | |
| 2593 } | |
| 2594 set_annotations(md, md_p); | |
| 2595 md->obj_at_put(idnum, anno); | |
| 2596 } // if no array and idnum isn't included there is nothing to do | |
| 2597 } | |
| 2598 | |
| 2599 // Construct a PreviousVersionNode entry for the array hung off | |
| 2600 // the instanceKlass. | |
|
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2601 PreviousVersionNode::PreviousVersionNode(jobject prev_constant_pool, |
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2602 bool prev_cp_is_weak, GrowableArray<jweak>* prev_EMCP_methods) { |
| 0 | 2603 |
| 2604 _prev_constant_pool = prev_constant_pool; | |
|
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2605 _prev_cp_is_weak = prev_cp_is_weak; |
| 0 | 2606 _prev_EMCP_methods = prev_EMCP_methods; |
| 2607 } | |
| 2608 | |
| 2609 | |
| 2610 // Destroy a PreviousVersionNode | |
| 2611 PreviousVersionNode::~PreviousVersionNode() { | |
| 2612 if (_prev_constant_pool != NULL) { | |
|
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2613 if (_prev_cp_is_weak) { |
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2614 JNIHandles::destroy_weak_global(_prev_constant_pool); |
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2615 } else { |
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2616 JNIHandles::destroy_global(_prev_constant_pool); |
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2617 } |
| 0 | 2618 } |
| 2619 | |
| 2620 if (_prev_EMCP_methods != NULL) { | |
| 2621 for (int i = _prev_EMCP_methods->length() - 1; i >= 0; i--) { | |
| 2622 jweak method_ref = _prev_EMCP_methods->at(i); | |
| 2623 if (method_ref != NULL) { | |
| 2624 JNIHandles::destroy_weak_global(method_ref); | |
| 2625 } | |
| 2626 } | |
| 2627 delete _prev_EMCP_methods; | |
| 2628 } | |
| 2629 } | |
| 2630 | |
| 2631 | |
| 2632 // Construct a PreviousVersionInfo entry | |
| 2633 PreviousVersionInfo::PreviousVersionInfo(PreviousVersionNode *pv_node) { | |
| 2634 _prev_constant_pool_handle = constantPoolHandle(); // NULL handle | |
| 2635 _prev_EMCP_method_handles = NULL; | |
| 2636 | |
|
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2637 jobject cp_ref = pv_node->prev_constant_pool(); |
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2638 assert(cp_ref != NULL, "constant pool ref was unexpectedly cleared"); |
| 0 | 2639 if (cp_ref == NULL) { |
| 2640 return; // robustness | |
| 2641 } | |
| 2642 | |
| 2643 constantPoolOop cp = (constantPoolOop)JNIHandles::resolve(cp_ref); | |
| 2644 if (cp == NULL) { | |
| 2645 // Weak reference has been GC'ed. Since the constant pool has been | |
| 2646 // GC'ed, the methods have also been GC'ed. | |
| 2647 return; | |
| 2648 } | |
| 2649 | |
| 2650 // make the constantPoolOop safe to return | |
| 2651 _prev_constant_pool_handle = constantPoolHandle(cp); | |
| 2652 | |
| 2653 GrowableArray<jweak>* method_refs = pv_node->prev_EMCP_methods(); | |
| 2654 if (method_refs == NULL) { | |
| 2655 // the instanceKlass did not have any EMCP methods | |
| 2656 return; | |
| 2657 } | |
| 2658 | |
| 2659 _prev_EMCP_method_handles = new GrowableArray<methodHandle>(10); | |
| 2660 | |
| 2661 int n_methods = method_refs->length(); | |
| 2662 for (int i = 0; i < n_methods; i++) { | |
| 2663 jweak method_ref = method_refs->at(i); | |
| 2664 assert(method_ref != NULL, "weak method ref was unexpectedly cleared"); | |
| 2665 if (method_ref == NULL) { | |
| 2666 continue; // robustness | |
| 2667 } | |
| 2668 | |
| 2669 methodOop method = (methodOop)JNIHandles::resolve(method_ref); | |
| 2670 if (method == NULL) { | |
| 2671 // this entry has been GC'ed so skip it | |
| 2672 continue; | |
| 2673 } | |
| 2674 | |
| 2675 // make the methodOop safe to return | |
| 2676 _prev_EMCP_method_handles->append(methodHandle(method)); | |
| 2677 } | |
| 2678 } | |
| 2679 | |
| 2680 | |
| 2681 // Destroy a PreviousVersionInfo | |
| 2682 PreviousVersionInfo::~PreviousVersionInfo() { | |
| 2683 // Since _prev_EMCP_method_handles is not C-heap allocated, we | |
| 2684 // don't have to delete it. | |
| 2685 } | |
| 2686 | |
| 2687 | |
| 2688 // Construct a helper for walking the previous versions array | |
| 2689 PreviousVersionWalker::PreviousVersionWalker(instanceKlass *ik) { | |
| 2690 _previous_versions = ik->previous_versions(); | |
| 2691 _current_index = 0; | |
| 2692 // _hm needs no initialization | |
| 2693 _current_p = NULL; | |
| 2694 } | |
| 2695 | |
| 2696 | |
| 2697 // Destroy a PreviousVersionWalker | |
| 2698 PreviousVersionWalker::~PreviousVersionWalker() { | |
| 2699 // Delete the current info just in case the caller didn't walk to | |
| 2700 // the end of the previous versions list. No harm if _current_p is | |
| 2701 // already NULL. | |
| 2702 delete _current_p; | |
| 2703 | |
| 2704 // When _hm is destroyed, all the Handles returned in | |
| 2705 // PreviousVersionInfo objects will be destroyed. | |
| 2706 // Also, after this destructor is finished it will be | |
| 2707 // safe to delete the GrowableArray allocated in the | |
| 2708 // PreviousVersionInfo objects. | |
| 2709 } | |
| 2710 | |
| 2711 | |
| 2712 // Return the interesting information for the next previous version | |
| 2713 // of the klass. Returns NULL if there are no more previous versions. | |
| 2714 PreviousVersionInfo* PreviousVersionWalker::next_previous_version() { | |
| 2715 if (_previous_versions == NULL) { | |
| 2716 // no previous versions so nothing to return | |
| 2717 return NULL; | |
| 2718 } | |
| 2719 | |
| 2720 delete _current_p; // cleanup the previous info for the caller | |
| 2721 _current_p = NULL; // reset to NULL so we don't delete same object twice | |
| 2722 | |
| 2723 int length = _previous_versions->length(); | |
| 2724 | |
| 2725 while (_current_index < length) { | |
| 2726 PreviousVersionNode * pv_node = _previous_versions->at(_current_index++); | |
| 2727 PreviousVersionInfo * pv_info = new (ResourceObj::C_HEAP) | |
| 2728 PreviousVersionInfo(pv_node); | |
| 2729 | |
| 2730 constantPoolHandle cp_h = pv_info->prev_constant_pool_handle(); | |
| 2731 if (cp_h.is_null()) { | |
| 2732 delete pv_info; | |
| 2733 | |
| 2734 // The underlying node's info has been GC'ed so try the next one. | |
| 2735 // We don't have to check the methods. If the constant pool has | |
| 2736 // GC'ed then so have the methods. | |
| 2737 continue; | |
| 2738 } | |
| 2739 | |
| 2740 // Found a node with non GC'ed info so return it. The caller will | |
| 2741 // need to delete pv_info when they are done with it. | |
| 2742 _current_p = pv_info; | |
| 2743 return pv_info; | |
| 2744 } | |
| 2745 | |
| 2746 // all of the underlying nodes' info has been GC'ed | |
| 2747 return NULL; | |
| 2748 } // end next_previous_version() |