Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiImpl.cpp @ 2195:bf8517f4e4d0
6766644: Redefinition of compiled method fails with assertion "Can not load classes with the Compiler thread"
Summary: Defer posting events from the compiler thread: use service thread
Reviewed-by: coleenp, dholmes, never, dcubed
| author | kamg |
|---|---|
| date | Wed, 02 Feb 2011 14:38:01 -0500 |
| parents | 3582bf76420e |
| children | f91db74a6810 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/systemDictionary.hpp" | |
| 27 #include "interpreter/interpreter.hpp" | |
| 28 #include "jvmtifiles/jvmtiEnv.hpp" | |
| 29 #include "memory/resourceArea.hpp" | |
| 30 #include "oops/instanceKlass.hpp" | |
| 31 #include "prims/jvmtiAgentThread.hpp" | |
| 32 #include "prims/jvmtiEventController.inline.hpp" | |
| 33 #include "prims/jvmtiImpl.hpp" | |
| 34 #include "prims/jvmtiRedefineClasses.hpp" | |
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35 #include "runtime/atomic.hpp" |
| 1972 | 36 #include "runtime/deoptimization.hpp" |
| 37 #include "runtime/handles.hpp" | |
| 38 #include "runtime/handles.inline.hpp" | |
| 39 #include "runtime/interfaceSupport.hpp" | |
| 40 #include "runtime/javaCalls.hpp" | |
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41 #include "runtime/serviceThread.hpp" |
| 1972 | 42 #include "runtime/signature.hpp" |
| 43 #include "runtime/vframe.hpp" | |
| 44 #include "runtime/vframe_hp.hpp" | |
| 45 #include "runtime/vm_operations.hpp" | |
| 46 #include "utilities/exceptions.hpp" | |
| 47 #ifdef TARGET_OS_FAMILY_linux | |
| 48 # include "thread_linux.inline.hpp" | |
| 49 #endif | |
| 50 #ifdef TARGET_OS_FAMILY_solaris | |
| 51 # include "thread_solaris.inline.hpp" | |
| 52 #endif | |
| 53 #ifdef TARGET_OS_FAMILY_windows | |
| 54 # include "thread_windows.inline.hpp" | |
| 55 #endif | |
| 0 | 56 |
| 57 // | |
| 58 // class JvmtiAgentThread | |
| 59 // | |
| 60 // JavaThread used to wrap a thread started by an agent | |
| 61 // using the JVMTI method RunAgentThread. | |
| 62 // | |
| 63 | |
| 64 JvmtiAgentThread::JvmtiAgentThread(JvmtiEnv* env, jvmtiStartFunction start_fn, const void *start_arg) | |
| 65 : JavaThread(start_function_wrapper) { | |
| 66 _env = env; | |
| 67 _start_fn = start_fn; | |
| 68 _start_arg = start_arg; | |
| 69 } | |
| 70 | |
| 71 void | |
| 72 JvmtiAgentThread::start_function_wrapper(JavaThread *thread, TRAPS) { | |
| 73 // It is expected that any Agent threads will be created as | |
| 74 // Java Threads. If this is the case, notification of the creation | |
| 75 // of the thread is given in JavaThread::thread_main(). | |
| 76 assert(thread->is_Java_thread(), "debugger thread should be a Java Thread"); | |
| 77 assert(thread == JavaThread::current(), "sanity check"); | |
| 78 | |
| 79 JvmtiAgentThread *dthread = (JvmtiAgentThread *)thread; | |
| 80 dthread->call_start_function(); | |
| 81 } | |
| 82 | |
| 83 void | |
| 84 JvmtiAgentThread::call_start_function() { | |
| 85 ThreadToNativeFromVM transition(this); | |
| 86 _start_fn(_env->jvmti_external(), jni_environment(), (void*)_start_arg); | |
| 87 } | |
| 88 | |
| 89 | |
| 90 // | |
| 91 // class GrowableCache - private methods | |
| 92 // | |
| 93 | |
| 94 void GrowableCache::recache() { | |
| 95 int len = _elements->length(); | |
| 96 | |
| 97 FREE_C_HEAP_ARRAY(address, _cache); | |
| 98 _cache = NEW_C_HEAP_ARRAY(address,len+1); | |
| 99 | |
| 100 for (int i=0; i<len; i++) { | |
| 101 _cache[i] = _elements->at(i)->getCacheValue(); | |
| 102 // | |
| 103 // The cache entry has gone bad. Without a valid frame pointer | |
| 104 // value, the entry is useless so we simply delete it in product | |
| 105 // mode. The call to remove() will rebuild the cache again | |
| 106 // without the bad entry. | |
| 107 // | |
| 108 if (_cache[i] == NULL) { | |
| 109 assert(false, "cannot recache NULL elements"); | |
| 110 remove(i); | |
| 111 return; | |
| 112 } | |
| 113 } | |
| 114 _cache[len] = NULL; | |
| 115 | |
| 116 _listener_fun(_this_obj,_cache); | |
| 117 } | |
| 118 | |
| 119 bool GrowableCache::equals(void* v, GrowableElement *e2) { | |
| 120 GrowableElement *e1 = (GrowableElement *) v; | |
| 121 assert(e1 != NULL, "e1 != NULL"); | |
| 122 assert(e2 != NULL, "e2 != NULL"); | |
| 123 | |
| 124 return e1->equals(e2); | |
| 125 } | |
| 126 | |
| 127 // | |
| 128 // class GrowableCache - public methods | |
| 129 // | |
| 130 | |
| 131 GrowableCache::GrowableCache() { | |
| 132 _this_obj = NULL; | |
| 133 _listener_fun = NULL; | |
| 134 _elements = NULL; | |
| 135 _cache = NULL; | |
| 136 } | |
| 137 | |
| 138 GrowableCache::~GrowableCache() { | |
| 139 clear(); | |
| 140 delete _elements; | |
| 141 FREE_C_HEAP_ARRAY(address, _cache); | |
| 142 } | |
| 143 | |
| 144 void GrowableCache::initialize(void *this_obj, void listener_fun(void *, address*) ) { | |
| 145 _this_obj = this_obj; | |
| 146 _listener_fun = listener_fun; | |
| 147 _elements = new (ResourceObj::C_HEAP) GrowableArray<GrowableElement*>(5,true); | |
| 148 recache(); | |
| 149 } | |
| 150 | |
| 151 // number of elements in the collection | |
| 152 int GrowableCache::length() { | |
| 153 return _elements->length(); | |
| 154 } | |
| 155 | |
| 156 // get the value of the index element in the collection | |
| 157 GrowableElement* GrowableCache::at(int index) { | |
| 158 GrowableElement *e = (GrowableElement *) _elements->at(index); | |
| 159 assert(e != NULL, "e != NULL"); | |
| 160 return e; | |
| 161 } | |
| 162 | |
| 163 int GrowableCache::find(GrowableElement* e) { | |
| 164 return _elements->find(e, GrowableCache::equals); | |
| 165 } | |
| 166 | |
| 167 // append a copy of the element to the end of the collection | |
| 168 void GrowableCache::append(GrowableElement* e) { | |
| 169 GrowableElement *new_e = e->clone(); | |
| 170 _elements->append(new_e); | |
| 171 recache(); | |
| 172 } | |
| 173 | |
| 174 // insert a copy of the element using lessthan() | |
| 175 void GrowableCache::insert(GrowableElement* e) { | |
| 176 GrowableElement *new_e = e->clone(); | |
| 177 _elements->append(new_e); | |
| 178 | |
| 179 int n = length()-2; | |
| 180 for (int i=n; i>=0; i--) { | |
| 181 GrowableElement *e1 = _elements->at(i); | |
| 182 GrowableElement *e2 = _elements->at(i+1); | |
| 183 if (e2->lessThan(e1)) { | |
| 184 _elements->at_put(i+1, e1); | |
| 185 _elements->at_put(i, e2); | |
| 186 } | |
| 187 } | |
| 188 | |
| 189 recache(); | |
| 190 } | |
| 191 | |
| 192 // remove the element at index | |
| 193 void GrowableCache::remove (int index) { | |
| 194 GrowableElement *e = _elements->at(index); | |
| 195 assert(e != NULL, "e != NULL"); | |
| 196 _elements->remove(e); | |
| 197 delete e; | |
| 198 recache(); | |
| 199 } | |
| 200 | |
| 201 // clear out all elements, release all heap space and | |
| 202 // let our listener know that things have changed. | |
| 203 void GrowableCache::clear() { | |
| 204 int len = _elements->length(); | |
| 205 for (int i=0; i<len; i++) { | |
| 206 delete _elements->at(i); | |
| 207 } | |
| 208 _elements->clear(); | |
| 209 recache(); | |
| 210 } | |
| 211 | |
| 212 void GrowableCache::oops_do(OopClosure* f) { | |
| 213 int len = _elements->length(); | |
| 214 for (int i=0; i<len; i++) { | |
| 215 GrowableElement *e = _elements->at(i); | |
| 216 e->oops_do(f); | |
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217 } |
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218 } |
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219 |
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220 void GrowableCache::gc_epilogue() { |
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221 int len = _elements->length(); |
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222 for (int i=0; i<len; i++) { |
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223 _cache[i] = _elements->at(i)->getCacheValue(); |
| 0 | 224 } |
| 225 } | |
| 226 | |
| 227 // | |
| 228 // class JvmtiBreakpoint | |
| 229 // | |
| 230 | |
| 231 JvmtiBreakpoint::JvmtiBreakpoint() { | |
| 232 _method = NULL; | |
| 233 _bci = 0; | |
| 234 #ifdef CHECK_UNHANDLED_OOPS | |
| 235 // This one is always allocated with new, but check it just in case. | |
| 236 Thread *thread = Thread::current(); | |
| 237 if (thread->is_in_stack((address)&_method)) { | |
| 238 thread->allow_unhandled_oop((oop*)&_method); | |
| 239 } | |
| 240 #endif // CHECK_UNHANDLED_OOPS | |
| 241 } | |
| 242 | |
| 243 JvmtiBreakpoint::JvmtiBreakpoint(methodOop m_method, jlocation location) { | |
| 244 _method = m_method; | |
| 245 assert(_method != NULL, "_method != NULL"); | |
| 246 _bci = (int) location; | |
| 247 #ifdef CHECK_UNHANDLED_OOPS | |
| 248 // Could be allocated with new and wouldn't be on the unhandled oop list. | |
| 249 Thread *thread = Thread::current(); | |
| 250 if (thread->is_in_stack((address)&_method)) { | |
| 251 thread->allow_unhandled_oop(&_method); | |
| 252 } | |
| 253 #endif // CHECK_UNHANDLED_OOPS | |
| 254 | |
| 255 assert(_bci >= 0, "_bci >= 0"); | |
| 256 } | |
| 257 | |
| 258 void JvmtiBreakpoint::copy(JvmtiBreakpoint& bp) { | |
| 259 _method = bp._method; | |
| 260 _bci = bp._bci; | |
| 261 } | |
| 262 | |
| 263 bool JvmtiBreakpoint::lessThan(JvmtiBreakpoint& bp) { | |
| 264 Unimplemented(); | |
| 265 return false; | |
| 266 } | |
| 267 | |
| 268 bool JvmtiBreakpoint::equals(JvmtiBreakpoint& bp) { | |
| 269 return _method == bp._method | |
| 270 && _bci == bp._bci; | |
| 271 } | |
| 272 | |
| 273 bool JvmtiBreakpoint::is_valid() { | |
| 274 return _method != NULL && | |
| 275 _bci >= 0; | |
| 276 } | |
| 277 | |
| 278 address JvmtiBreakpoint::getBcp() { | |
| 279 return _method->bcp_from(_bci); | |
| 280 } | |
| 281 | |
| 282 void JvmtiBreakpoint::each_method_version_do(method_action meth_act) { | |
| 283 ((methodOopDesc*)_method->*meth_act)(_bci); | |
| 284 | |
| 285 // add/remove breakpoint to/from versions of the method that | |
| 286 // are EMCP. Directly or transitively obsolete methods are | |
| 287 // not saved in the PreviousVersionInfo. | |
| 288 Thread *thread = Thread::current(); | |
| 289 instanceKlassHandle ikh = instanceKlassHandle(thread, _method->method_holder()); | |
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290 Symbol* m_name = _method->name(); |
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291 Symbol* m_signature = _method->signature(); |
| 0 | 292 |
| 293 { | |
| 294 ResourceMark rm(thread); | |
| 295 // PreviousVersionInfo objects returned via PreviousVersionWalker | |
| 296 // contain a GrowableArray of handles. We have to clean up the | |
| 297 // GrowableArray _after_ the PreviousVersionWalker destructor | |
| 298 // has destroyed the handles. | |
| 299 { | |
| 300 // search previous versions if they exist | |
| 301 PreviousVersionWalker pvw((instanceKlass *)ikh()->klass_part()); | |
| 302 for (PreviousVersionInfo * pv_info = pvw.next_previous_version(); | |
| 303 pv_info != NULL; pv_info = pvw.next_previous_version()) { | |
| 304 GrowableArray<methodHandle>* methods = | |
| 305 pv_info->prev_EMCP_method_handles(); | |
| 306 | |
| 307 if (methods == NULL) { | |
| 308 // We have run into a PreviousVersion generation where | |
| 309 // all methods were made obsolete during that generation's | |
| 310 // RedefineClasses() operation. At the time of that | |
| 311 // operation, all EMCP methods were flushed so we don't | |
| 312 // have to go back any further. | |
| 313 // | |
| 314 // A NULL methods array is different than an empty methods | |
| 315 // array. We cannot infer any optimizations about older | |
| 316 // generations from an empty methods array for the current | |
| 317 // generation. | |
| 318 break; | |
| 319 } | |
| 320 | |
| 321 for (int i = methods->length() - 1; i >= 0; i--) { | |
| 322 methodHandle method = methods->at(i); | |
| 323 if (method->name() == m_name && method->signature() == m_signature) { | |
| 324 RC_TRACE(0x00000800, ("%sing breakpoint in %s(%s)", | |
| 325 meth_act == &methodOopDesc::set_breakpoint ? "sett" : "clear", | |
| 326 method->name()->as_C_string(), | |
| 327 method->signature()->as_C_string())); | |
| 328 assert(!method->is_obsolete(), "only EMCP methods here"); | |
| 329 | |
| 330 ((methodOopDesc*)method()->*meth_act)(_bci); | |
| 331 break; | |
| 332 } | |
| 333 } | |
| 334 } | |
| 335 } // pvw is cleaned up | |
| 336 } // rm is cleaned up | |
| 337 } | |
| 338 | |
| 339 void JvmtiBreakpoint::set() { | |
| 340 each_method_version_do(&methodOopDesc::set_breakpoint); | |
| 341 } | |
| 342 | |
| 343 void JvmtiBreakpoint::clear() { | |
| 344 each_method_version_do(&methodOopDesc::clear_breakpoint); | |
| 345 } | |
| 346 | |
| 347 void JvmtiBreakpoint::print() { | |
| 348 #ifndef PRODUCT | |
| 349 const char *class_name = (_method == NULL) ? "NULL" : _method->klass_name()->as_C_string(); | |
| 350 const char *method_name = (_method == NULL) ? "NULL" : _method->name()->as_C_string(); | |
| 351 | |
| 352 tty->print("Breakpoint(%s,%s,%d,%p)",class_name, method_name, _bci, getBcp()); | |
| 353 #endif | |
| 354 } | |
| 355 | |
| 356 | |
| 357 // | |
| 358 // class VM_ChangeBreakpoints | |
| 359 // | |
| 360 // Modify the Breakpoints data structure at a safepoint | |
| 361 // | |
| 362 | |
| 363 void VM_ChangeBreakpoints::doit() { | |
| 364 switch (_operation) { | |
| 365 case SET_BREAKPOINT: | |
| 366 _breakpoints->set_at_safepoint(*_bp); | |
| 367 break; | |
| 368 case CLEAR_BREAKPOINT: | |
| 369 _breakpoints->clear_at_safepoint(*_bp); | |
| 370 break; | |
| 371 case CLEAR_ALL_BREAKPOINT: | |
| 372 _breakpoints->clearall_at_safepoint(); | |
| 373 break; | |
| 374 default: | |
| 375 assert(false, "Unknown operation"); | |
| 376 } | |
| 377 } | |
| 378 | |
| 379 void VM_ChangeBreakpoints::oops_do(OopClosure* f) { | |
| 380 // This operation keeps breakpoints alive | |
| 381 if (_breakpoints != NULL) { | |
| 382 _breakpoints->oops_do(f); | |
| 383 } | |
| 384 if (_bp != NULL) { | |
| 385 _bp->oops_do(f); | |
| 386 } | |
| 387 } | |
| 388 | |
| 389 // | |
| 390 // class JvmtiBreakpoints | |
| 391 // | |
| 392 // a JVMTI internal collection of JvmtiBreakpoint | |
| 393 // | |
| 394 | |
| 395 JvmtiBreakpoints::JvmtiBreakpoints(void listener_fun(void *,address *)) { | |
| 396 _bps.initialize(this,listener_fun); | |
| 397 } | |
| 398 | |
| 399 JvmtiBreakpoints:: ~JvmtiBreakpoints() {} | |
| 400 | |
| 401 void JvmtiBreakpoints::oops_do(OopClosure* f) { | |
| 402 _bps.oops_do(f); | |
| 403 } | |
| 404 | |
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405 void JvmtiBreakpoints::gc_epilogue() { |
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406 _bps.gc_epilogue(); |
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407 } |
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408 |
| 0 | 409 void JvmtiBreakpoints::print() { |
| 410 #ifndef PRODUCT | |
| 411 ResourceMark rm; | |
| 412 | |
| 413 int n = _bps.length(); | |
| 414 for (int i=0; i<n; i++) { | |
| 415 JvmtiBreakpoint& bp = _bps.at(i); | |
| 416 tty->print("%d: ", i); | |
| 417 bp.print(); | |
| 418 tty->print_cr(""); | |
| 419 } | |
| 420 #endif | |
| 421 } | |
| 422 | |
| 423 | |
| 424 void JvmtiBreakpoints::set_at_safepoint(JvmtiBreakpoint& bp) { | |
| 425 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
| 426 | |
| 427 int i = _bps.find(bp); | |
| 428 if (i == -1) { | |
| 429 _bps.append(bp); | |
| 430 bp.set(); | |
| 431 } | |
| 432 } | |
| 433 | |
| 434 void JvmtiBreakpoints::clear_at_safepoint(JvmtiBreakpoint& bp) { | |
| 435 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
| 436 | |
| 437 int i = _bps.find(bp); | |
| 438 if (i != -1) { | |
| 439 _bps.remove(i); | |
| 440 bp.clear(); | |
| 441 } | |
| 442 } | |
| 443 | |
| 444 void JvmtiBreakpoints::clearall_at_safepoint() { | |
| 445 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
| 446 | |
| 447 int len = _bps.length(); | |
| 448 for (int i=0; i<len; i++) { | |
| 449 _bps.at(i).clear(); | |
| 450 } | |
| 451 _bps.clear(); | |
| 452 } | |
| 453 | |
| 454 int JvmtiBreakpoints::length() { return _bps.length(); } | |
| 455 | |
| 456 int JvmtiBreakpoints::set(JvmtiBreakpoint& bp) { | |
| 457 if ( _bps.find(bp) != -1) { | |
| 458 return JVMTI_ERROR_DUPLICATE; | |
| 459 } | |
| 460 VM_ChangeBreakpoints set_breakpoint(this,VM_ChangeBreakpoints::SET_BREAKPOINT, &bp); | |
| 461 VMThread::execute(&set_breakpoint); | |
| 462 return JVMTI_ERROR_NONE; | |
| 463 } | |
| 464 | |
| 465 int JvmtiBreakpoints::clear(JvmtiBreakpoint& bp) { | |
| 466 if ( _bps.find(bp) == -1) { | |
| 467 return JVMTI_ERROR_NOT_FOUND; | |
| 468 } | |
| 469 | |
| 470 VM_ChangeBreakpoints clear_breakpoint(this,VM_ChangeBreakpoints::CLEAR_BREAKPOINT, &bp); | |
| 471 VMThread::execute(&clear_breakpoint); | |
| 472 return JVMTI_ERROR_NONE; | |
| 473 } | |
| 474 | |
| 475 void JvmtiBreakpoints::clearall_in_class_at_safepoint(klassOop klass) { | |
| 476 bool changed = true; | |
| 477 // We are going to run thru the list of bkpts | |
| 478 // and delete some. This deletion probably alters | |
| 479 // the list in some implementation defined way such | |
| 480 // that when we delete entry i, the next entry might | |
| 481 // no longer be at i+1. To be safe, each time we delete | |
| 482 // an entry, we'll just start again from the beginning. | |
| 483 // We'll stop when we make a pass thru the whole list without | |
| 484 // deleting anything. | |
| 485 while (changed) { | |
| 486 int len = _bps.length(); | |
| 487 changed = false; | |
| 488 for (int i = 0; i < len; i++) { | |
| 489 JvmtiBreakpoint& bp = _bps.at(i); | |
| 490 if (bp.method()->method_holder() == klass) { | |
| 491 bp.clear(); | |
| 492 _bps.remove(i); | |
| 493 // This changed 'i' so we have to start over. | |
| 494 changed = true; | |
| 495 break; | |
| 496 } | |
| 497 } | |
| 498 } | |
| 499 } | |
| 500 | |
| 501 void JvmtiBreakpoints::clearall() { | |
| 502 VM_ChangeBreakpoints clearall_breakpoint(this,VM_ChangeBreakpoints::CLEAR_ALL_BREAKPOINT); | |
| 503 VMThread::execute(&clearall_breakpoint); | |
| 504 } | |
| 505 | |
| 506 // | |
| 507 // class JvmtiCurrentBreakpoints | |
| 508 // | |
| 509 | |
| 510 JvmtiBreakpoints *JvmtiCurrentBreakpoints::_jvmti_breakpoints = NULL; | |
| 511 address * JvmtiCurrentBreakpoints::_breakpoint_list = NULL; | |
| 512 | |
| 513 | |
| 514 JvmtiBreakpoints& JvmtiCurrentBreakpoints::get_jvmti_breakpoints() { | |
| 515 if (_jvmti_breakpoints != NULL) return (*_jvmti_breakpoints); | |
| 516 _jvmti_breakpoints = new JvmtiBreakpoints(listener_fun); | |
| 517 assert(_jvmti_breakpoints != NULL, "_jvmti_breakpoints != NULL"); | |
| 518 return (*_jvmti_breakpoints); | |
| 519 } | |
| 520 | |
| 521 void JvmtiCurrentBreakpoints::listener_fun(void *this_obj, address *cache) { | |
| 522 JvmtiBreakpoints *this_jvmti = (JvmtiBreakpoints *) this_obj; | |
| 523 assert(this_jvmti != NULL, "this_jvmti != NULL"); | |
| 524 | |
| 525 debug_only(int n = this_jvmti->length();); | |
| 526 assert(cache[n] == NULL, "cache must be NULL terminated"); | |
| 527 | |
| 528 set_breakpoint_list(cache); | |
| 529 } | |
| 530 | |
| 531 | |
| 532 void JvmtiCurrentBreakpoints::oops_do(OopClosure* f) { | |
| 533 if (_jvmti_breakpoints != NULL) { | |
| 534 _jvmti_breakpoints->oops_do(f); | |
| 535 } | |
| 536 } | |
| 537 | |
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538 void JvmtiCurrentBreakpoints::gc_epilogue() { |
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539 if (_jvmti_breakpoints != NULL) { |
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540 _jvmti_breakpoints->gc_epilogue(); |
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541 } |
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542 } |
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543 |
| 0 | 544 /////////////////////////////////////////////////////////////// |
| 545 // | |
| 546 // class VM_GetOrSetLocal | |
| 547 // | |
| 548 | |
| 549 // Constructor for non-object getter | |
| 550 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type) | |
| 551 : _thread(thread) | |
| 552 , _calling_thread(NULL) | |
| 553 , _depth(depth) | |
| 554 , _index(index) | |
| 555 , _type(type) | |
| 556 , _set(false) | |
| 557 , _jvf(NULL) | |
| 558 , _result(JVMTI_ERROR_NONE) | |
| 559 { | |
| 560 } | |
| 561 | |
| 562 // Constructor for object or non-object setter | |
| 563 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type, jvalue value) | |
| 564 : _thread(thread) | |
| 565 , _calling_thread(NULL) | |
| 566 , _depth(depth) | |
| 567 , _index(index) | |
| 568 , _type(type) | |
| 569 , _value(value) | |
| 570 , _set(true) | |
| 571 , _jvf(NULL) | |
| 572 , _result(JVMTI_ERROR_NONE) | |
| 573 { | |
| 574 } | |
| 575 | |
| 576 // Constructor for object getter | |
| 577 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, JavaThread* calling_thread, jint depth, int index) | |
| 578 : _thread(thread) | |
| 579 , _calling_thread(calling_thread) | |
| 580 , _depth(depth) | |
| 581 , _index(index) | |
| 582 , _type(T_OBJECT) | |
| 583 , _set(false) | |
| 584 , _jvf(NULL) | |
| 585 , _result(JVMTI_ERROR_NONE) | |
| 586 { | |
| 587 } | |
| 588 | |
| 589 vframe *VM_GetOrSetLocal::get_vframe() { | |
| 590 if (!_thread->has_last_Java_frame()) { | |
| 591 return NULL; | |
| 592 } | |
| 593 RegisterMap reg_map(_thread); | |
| 594 vframe *vf = _thread->last_java_vframe(®_map); | |
| 595 int d = 0; | |
| 596 while ((vf != NULL) && (d < _depth)) { | |
| 597 vf = vf->java_sender(); | |
| 598 d++; | |
| 599 } | |
| 600 return vf; | |
| 601 } | |
| 602 | |
| 603 javaVFrame *VM_GetOrSetLocal::get_java_vframe() { | |
| 604 vframe* vf = get_vframe(); | |
| 605 if (vf == NULL) { | |
| 606 _result = JVMTI_ERROR_NO_MORE_FRAMES; | |
| 607 return NULL; | |
| 608 } | |
| 609 javaVFrame *jvf = (javaVFrame*)vf; | |
| 610 | |
| 2019 | 611 if (!vf->is_java_frame()) { |
| 0 | 612 _result = JVMTI_ERROR_OPAQUE_FRAME; |
| 613 return NULL; | |
| 614 } | |
| 615 return jvf; | |
| 616 } | |
| 617 | |
| 618 // Check that the klass is assignable to a type with the given signature. | |
| 619 // Another solution could be to use the function Klass::is_subtype_of(type). | |
| 620 // But the type class can be forced to load/initialize eagerly in such a case. | |
| 621 // This may cause unexpected consequences like CFLH or class-init JVMTI events. | |
| 622 // It is better to avoid such a behavior. | |
| 623 bool VM_GetOrSetLocal::is_assignable(const char* ty_sign, Klass* klass, Thread* thread) { | |
| 624 assert(ty_sign != NULL, "type signature must not be NULL"); | |
| 625 assert(thread != NULL, "thread must not be NULL"); | |
| 626 assert(klass != NULL, "klass must not be NULL"); | |
| 627 | |
| 628 int len = (int) strlen(ty_sign); | |
| 629 if (ty_sign[0] == 'L' && ty_sign[len-1] == ';') { // Need pure class/interface name | |
| 630 ty_sign++; | |
| 631 len -= 2; | |
| 632 } | |
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633 TempNewSymbol ty_sym = SymbolTable::new_symbol(ty_sign, len, thread); |
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634 if (klass->name() == ty_sym) { |
| 0 | 635 return true; |
| 636 } | |
| 637 // Compare primary supers | |
| 638 int super_depth = klass->super_depth(); | |
| 639 int idx; | |
| 640 for (idx = 0; idx < super_depth; idx++) { | |
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641 if (Klass::cast(klass->primary_super_of_depth(idx))->name() == ty_sym) { |
| 0 | 642 return true; |
| 643 } | |
| 644 } | |
| 645 // Compare secondary supers | |
| 646 objArrayOop sec_supers = klass->secondary_supers(); | |
| 647 for (idx = 0; idx < sec_supers->length(); idx++) { | |
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648 if (Klass::cast((klassOop) sec_supers->obj_at(idx))->name() == ty_sym) { |
| 0 | 649 return true; |
| 650 } | |
| 651 } | |
| 652 return false; | |
| 653 } | |
| 654 | |
| 655 // Checks error conditions: | |
| 656 // JVMTI_ERROR_INVALID_SLOT | |
| 657 // JVMTI_ERROR_TYPE_MISMATCH | |
| 658 // Returns: 'true' - everything is Ok, 'false' - error code | |
| 659 | |
| 660 bool VM_GetOrSetLocal::check_slot_type(javaVFrame* jvf) { | |
| 661 methodOop method_oop = jvf->method(); | |
| 662 if (!method_oop->has_localvariable_table()) { | |
| 663 // Just to check index boundaries | |
| 664 jint extra_slot = (_type == T_LONG || _type == T_DOUBLE) ? 1 : 0; | |
| 665 if (_index < 0 || _index + extra_slot >= method_oop->max_locals()) { | |
| 666 _result = JVMTI_ERROR_INVALID_SLOT; | |
| 667 return false; | |
| 668 } | |
| 669 return true; | |
| 670 } | |
| 671 | |
| 672 jint num_entries = method_oop->localvariable_table_length(); | |
| 673 if (num_entries == 0) { | |
| 674 _result = JVMTI_ERROR_INVALID_SLOT; | |
| 675 return false; // There are no slots | |
| 676 } | |
| 677 int signature_idx = -1; | |
| 678 int vf_bci = jvf->bci(); | |
| 679 LocalVariableTableElement* table = method_oop->localvariable_table_start(); | |
| 680 for (int i = 0; i < num_entries; i++) { | |
| 681 int start_bci = table[i].start_bci; | |
| 682 int end_bci = start_bci + table[i].length; | |
| 683 | |
| 684 // Here we assume that locations of LVT entries | |
| 685 // with the same slot number cannot be overlapped | |
| 686 if (_index == (jint) table[i].slot && start_bci <= vf_bci && vf_bci <= end_bci) { | |
| 687 signature_idx = (int) table[i].descriptor_cp_index; | |
| 688 break; | |
| 689 } | |
| 690 } | |
| 691 if (signature_idx == -1) { | |
| 692 _result = JVMTI_ERROR_INVALID_SLOT; | |
| 693 return false; // Incorrect slot index | |
| 694 } | |
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695 Symbol* sign_sym = method_oop->constants()->symbol_at(signature_idx); |
| 0 | 696 const char* signature = (const char *) sign_sym->as_utf8(); |
| 697 BasicType slot_type = char2type(signature[0]); | |
| 698 | |
| 699 switch (slot_type) { | |
| 700 case T_BYTE: | |
| 701 case T_SHORT: | |
| 702 case T_CHAR: | |
| 703 case T_BOOLEAN: | |
| 704 slot_type = T_INT; | |
| 705 break; | |
| 706 case T_ARRAY: | |
| 707 slot_type = T_OBJECT; | |
| 708 break; | |
| 709 }; | |
| 710 if (_type != slot_type) { | |
| 711 _result = JVMTI_ERROR_TYPE_MISMATCH; | |
| 712 return false; | |
| 713 } | |
| 714 | |
| 715 jobject jobj = _value.l; | |
| 716 if (_set && slot_type == T_OBJECT && jobj != NULL) { // NULL reference is allowed | |
| 717 // Check that the jobject class matches the return type signature. | |
| 718 JavaThread* cur_thread = JavaThread::current(); | |
| 719 HandleMark hm(cur_thread); | |
| 720 | |
| 721 Handle obj = Handle(cur_thread, JNIHandles::resolve_external_guard(jobj)); | |
| 722 NULL_CHECK(obj, (_result = JVMTI_ERROR_INVALID_OBJECT, false)); | |
| 723 KlassHandle ob_kh = KlassHandle(cur_thread, obj->klass()); | |
| 724 NULL_CHECK(ob_kh, (_result = JVMTI_ERROR_INVALID_OBJECT, false)); | |
| 725 | |
| 726 if (!is_assignable(signature, Klass::cast(ob_kh()), cur_thread)) { | |
| 727 _result = JVMTI_ERROR_TYPE_MISMATCH; | |
| 728 return false; | |
| 729 } | |
| 730 } | |
| 731 return true; | |
| 732 } | |
| 733 | |
| 734 static bool can_be_deoptimized(vframe* vf) { | |
| 735 return (vf->is_compiled_frame() && vf->fr().can_be_deoptimized()); | |
| 736 } | |
| 737 | |
| 738 bool VM_GetOrSetLocal::doit_prologue() { | |
| 739 _jvf = get_java_vframe(); | |
| 740 NULL_CHECK(_jvf, false); | |
| 741 | |
| 2019 | 742 if (_jvf->method()->is_native()) { |
| 743 if (getting_receiver() && !_jvf->method()->is_static()) { | |
| 744 return true; | |
| 745 } else { | |
| 746 _result = JVMTI_ERROR_OPAQUE_FRAME; | |
| 747 return false; | |
| 748 } | |
| 749 } | |
| 750 | |
| 0 | 751 if (!check_slot_type(_jvf)) { |
| 752 return false; | |
| 753 } | |
| 754 return true; | |
| 755 } | |
| 756 | |
| 757 void VM_GetOrSetLocal::doit() { | |
| 758 if (_set) { | |
| 759 // Force deoptimization of frame if compiled because it's | |
| 760 // possible the compiler emitted some locals as constant values, | |
| 761 // meaning they are not mutable. | |
| 762 if (can_be_deoptimized(_jvf)) { | |
| 763 | |
| 764 // Schedule deoptimization so that eventually the local | |
| 765 // update will be written to an interpreter frame. | |
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766 Deoptimization::deoptimize_frame(_jvf->thread(), _jvf->fr().id()); |
| 0 | 767 |
| 768 // Now store a new value for the local which will be applied | |
| 769 // once deoptimization occurs. Note however that while this | |
| 770 // write is deferred until deoptimization actually happens | |
| 771 // can vframe created after this point will have its locals | |
| 772 // reflecting this update so as far as anyone can see the | |
| 773 // write has already taken place. | |
| 774 | |
| 775 // If we are updating an oop then get the oop from the handle | |
| 776 // since the handle will be long gone by the time the deopt | |
| 777 // happens. The oop stored in the deferred local will be | |
| 778 // gc'd on its own. | |
| 779 if (_type == T_OBJECT) { | |
| 780 _value.l = (jobject) (JNIHandles::resolve_external_guard(_value.l)); | |
| 781 } | |
| 782 // Re-read the vframe so we can see that it is deoptimized | |
| 783 // [ Only need because of assert in update_local() ] | |
| 784 _jvf = get_java_vframe(); | |
| 785 ((compiledVFrame*)_jvf)->update_local(_type, _index, _value); | |
| 786 return; | |
| 787 } | |
| 788 StackValueCollection *locals = _jvf->locals(); | |
| 789 HandleMark hm; | |
| 790 | |
| 791 switch (_type) { | |
| 2019 | 792 case T_INT: locals->set_int_at (_index, _value.i); break; |
| 793 case T_LONG: locals->set_long_at (_index, _value.j); break; | |
| 794 case T_FLOAT: locals->set_float_at (_index, _value.f); break; | |
| 795 case T_DOUBLE: locals->set_double_at(_index, _value.d); break; | |
| 796 case T_OBJECT: { | |
| 797 Handle ob_h(JNIHandles::resolve_external_guard(_value.l)); | |
| 798 locals->set_obj_at (_index, ob_h); | |
| 799 break; | |
| 800 } | |
| 801 default: ShouldNotReachHere(); | |
| 0 | 802 } |
| 803 _jvf->set_locals(locals); | |
| 804 } else { | |
| 2019 | 805 if (_jvf->method()->is_native() && _jvf->is_compiled_frame()) { |
| 806 assert(getting_receiver(), "Can only get here when getting receiver"); | |
| 807 oop receiver = _jvf->fr().get_native_receiver(); | |
| 808 _value.l = JNIHandles::make_local(_calling_thread, receiver); | |
| 809 } else { | |
| 810 StackValueCollection *locals = _jvf->locals(); | |
| 0 | 811 |
| 2019 | 812 if (locals->at(_index)->type() == T_CONFLICT) { |
| 813 memset(&_value, 0, sizeof(_value)); | |
| 814 _value.l = NULL; | |
| 815 return; | |
| 816 } | |
| 0 | 817 |
| 2019 | 818 switch (_type) { |
| 819 case T_INT: _value.i = locals->int_at (_index); break; | |
| 820 case T_LONG: _value.j = locals->long_at (_index); break; | |
| 821 case T_FLOAT: _value.f = locals->float_at (_index); break; | |
| 822 case T_DOUBLE: _value.d = locals->double_at(_index); break; | |
| 823 case T_OBJECT: { | |
| 824 // Wrap the oop to be returned in a local JNI handle since | |
| 825 // oops_do() no longer applies after doit() is finished. | |
| 826 oop obj = locals->obj_at(_index)(); | |
| 827 _value.l = JNIHandles::make_local(_calling_thread, obj); | |
| 828 break; | |
| 829 } | |
| 830 default: ShouldNotReachHere(); | |
| 831 } | |
| 0 | 832 } |
| 833 } | |
| 834 } | |
| 835 | |
| 836 | |
| 837 bool VM_GetOrSetLocal::allow_nested_vm_operations() const { | |
| 838 return true; // May need to deoptimize | |
| 839 } | |
| 840 | |
| 841 | |
| 2019 | 842 VM_GetReceiver::VM_GetReceiver( |
| 843 JavaThread* thread, JavaThread* caller_thread, jint depth) | |
| 844 : VM_GetOrSetLocal(thread, caller_thread, depth, 0) {} | |
| 845 | |
| 0 | 846 ///////////////////////////////////////////////////////////////////////////////////////// |
| 847 | |
| 848 // | |
| 849 // class JvmtiSuspendControl - see comments in jvmtiImpl.hpp | |
| 850 // | |
| 851 | |
| 852 bool JvmtiSuspendControl::suspend(JavaThread *java_thread) { | |
| 853 // external suspend should have caught suspending a thread twice | |
| 854 | |
| 855 // Immediate suspension required for JPDA back-end so JVMTI agent threads do | |
| 856 // not deadlock due to later suspension on transitions while holding | |
| 857 // raw monitors. Passing true causes the immediate suspension. | |
| 858 // java_suspend() will catch threads in the process of exiting | |
| 859 // and will ignore them. | |
| 860 java_thread->java_suspend(); | |
| 861 | |
| 862 // It would be nice to have the following assertion in all the time, | |
| 863 // but it is possible for a racing resume request to have resumed | |
| 864 // this thread right after we suspended it. Temporarily enable this | |
| 865 // assertion if you are chasing a different kind of bug. | |
| 866 // | |
| 867 // assert(java_lang_Thread::thread(java_thread->threadObj()) == NULL || | |
| 868 // java_thread->is_being_ext_suspended(), "thread is not suspended"); | |
| 869 | |
| 870 if (java_lang_Thread::thread(java_thread->threadObj()) == NULL) { | |
| 871 // check again because we can get delayed in java_suspend(): | |
| 872 // the thread is in process of exiting. | |
| 873 return false; | |
| 874 } | |
| 875 | |
| 876 return true; | |
| 877 } | |
| 878 | |
| 879 bool JvmtiSuspendControl::resume(JavaThread *java_thread) { | |
| 880 // external suspend should have caught resuming a thread twice | |
| 881 assert(java_thread->is_being_ext_suspended(), "thread should be suspended"); | |
| 882 | |
| 883 // resume thread | |
| 884 { | |
| 885 // must always grab Threads_lock, see JVM_SuspendThread | |
| 886 MutexLocker ml(Threads_lock); | |
| 887 java_thread->java_resume(); | |
| 888 } | |
| 889 | |
| 890 return true; | |
| 891 } | |
| 892 | |
| 893 | |
| 894 void JvmtiSuspendControl::print() { | |
| 895 #ifndef PRODUCT | |
| 896 MutexLocker mu(Threads_lock); | |
| 897 ResourceMark rm; | |
| 898 | |
| 899 tty->print("Suspended Threads: ["); | |
| 900 for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) { | |
| 901 #if JVMTI_TRACE | |
| 902 const char *name = JvmtiTrace::safe_get_thread_name(thread); | |
| 903 #else | |
| 904 const char *name = ""; | |
| 905 #endif /*JVMTI_TRACE */ | |
| 906 tty->print("%s(%c ", name, thread->is_being_ext_suspended() ? 'S' : '_'); | |
| 907 if (!thread->has_last_Java_frame()) { | |
| 908 tty->print("no stack"); | |
| 909 } | |
| 910 tty->print(") "); | |
| 911 } | |
| 912 tty->print_cr("]"); | |
| 913 #endif | |
| 914 } | |
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915 |
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916 #ifndef KERNEL |
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917 |
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918 JvmtiDeferredEvent JvmtiDeferredEvent::compiled_method_load_event( |
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919 nmethod* nm) { |
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920 JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_COMPILED_METHOD_LOAD); |
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921 event.set_compiled_method_load(nm); |
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922 nmethodLocker::lock_nmethod(nm); // will be unlocked when posted |
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923 return event; |
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924 } |
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925 |
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926 JvmtiDeferredEvent JvmtiDeferredEvent::compiled_method_unload_event( |
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927 jmethodID id, const void* code) { |
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928 JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_COMPILED_METHOD_UNLOAD); |
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929 event.set_compiled_method_unload(id, code); |
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930 return event; |
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931 } |
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932 |
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933 void JvmtiDeferredEvent::post() { |
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934 switch(_type) { |
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935 case TYPE_COMPILED_METHOD_LOAD: |
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936 JvmtiExport::post_compiled_method_load(compiled_method_load()); |
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937 nmethodLocker::unlock_nmethod(compiled_method_load()); |
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938 break; |
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939 case TYPE_COMPILED_METHOD_UNLOAD: |
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940 JvmtiExport::post_compiled_method_unload( |
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941 compiled_method_unload_method_id(), |
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942 compiled_method_unload_code_begin()); |
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943 break; |
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944 case TYPE_FLUSH: |
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945 JvmtiDeferredEventQueue::flush_complete(flush_state_addr()); |
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946 break; |
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947 default: |
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948 ShouldNotReachHere(); |
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949 } |
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950 } |
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951 |
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952 JvmtiDeferredEventQueue::QueueNode* JvmtiDeferredEventQueue::_queue_tail = NULL; |
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953 JvmtiDeferredEventQueue::QueueNode* JvmtiDeferredEventQueue::_queue_head = NULL; |
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954 |
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955 volatile JvmtiDeferredEventQueue::QueueNode* |
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956 JvmtiDeferredEventQueue::_pending_list = NULL; |
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957 |
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958 bool JvmtiDeferredEventQueue::has_events() { |
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959 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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960 return _queue_head != NULL || _pending_list != NULL; |
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961 } |
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962 |
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963 void JvmtiDeferredEventQueue::enqueue(const JvmtiDeferredEvent& event) { |
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964 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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965 |
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966 process_pending_events(); |
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967 |
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968 // Events get added to the end of the queue (and are pulled off the front). |
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969 QueueNode* node = new QueueNode(event); |
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970 if (_queue_tail == NULL) { |
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971 _queue_tail = _queue_head = node; |
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972 } else { |
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973 assert(_queue_tail->next() == NULL, "Must be the last element in the list"); |
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974 _queue_tail->set_next(node); |
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975 _queue_tail = node; |
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976 } |
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977 |
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978 Service_lock->notify_all(); |
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979 assert((_queue_head == NULL) == (_queue_tail == NULL), |
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980 "Inconsistent queue markers"); |
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981 } |
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982 |
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983 JvmtiDeferredEvent JvmtiDeferredEventQueue::dequeue() { |
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984 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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985 |
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986 process_pending_events(); |
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987 |
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988 assert(_queue_head != NULL, "Nothing to dequeue"); |
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989 |
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990 if (_queue_head == NULL) { |
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991 // Just in case this happens in product; it shouldn't but let's not crash |
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992 return JvmtiDeferredEvent(); |
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993 } |
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994 |
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995 QueueNode* node = _queue_head; |
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996 _queue_head = _queue_head->next(); |
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997 if (_queue_head == NULL) { |
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998 _queue_tail = NULL; |
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999 } |
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1000 |
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1001 assert((_queue_head == NULL) == (_queue_tail == NULL), |
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1002 "Inconsistent queue markers"); |
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1003 |
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1004 JvmtiDeferredEvent event = node->event(); |
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1005 delete node; |
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1006 return event; |
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1007 } |
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1008 |
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1009 void JvmtiDeferredEventQueue::add_pending_event( |
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1010 const JvmtiDeferredEvent& event) { |
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1011 |
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1012 QueueNode* node = new QueueNode(event); |
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1013 |
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1014 bool success = false; |
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1015 QueueNode* prev_value = (QueueNode*)_pending_list; |
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1016 do { |
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1017 node->set_next(prev_value); |
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1018 prev_value = (QueueNode*)Atomic::cmpxchg_ptr( |
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1019 (void*)node, (volatile void*)&_pending_list, (void*)node->next()); |
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1020 } while (prev_value != node->next()); |
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1021 } |
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1022 |
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1023 // This method transfers any events that were added by someone NOT holding |
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1024 // the lock into the mainline queue. |
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1025 void JvmtiDeferredEventQueue::process_pending_events() { |
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1026 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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1027 |
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1028 if (_pending_list != NULL) { |
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1029 QueueNode* head = |
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1030 (QueueNode*)Atomic::xchg_ptr(NULL, (volatile void*)&_pending_list); |
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1031 |
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1032 assert((_queue_head == NULL) == (_queue_tail == NULL), |
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1033 "Inconsistent queue markers"); |
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1034 |
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1035 if (head != NULL) { |
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1036 // Since we've treated the pending list as a stack (with newer |
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1037 // events at the beginning), we need to join the bottom of the stack |
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1038 // with the 'tail' of the queue in order to get the events in the |
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1039 // right order. We do this by reversing the pending list and appending |
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1040 // it to the queue. |
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1041 |
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1042 QueueNode* new_tail = head; |
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1043 QueueNode* new_head = NULL; |
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1044 |
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1045 // This reverses the list |
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1046 QueueNode* prev = new_tail; |
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1047 QueueNode* node = new_tail->next(); |
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1048 new_tail->set_next(NULL); |
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1049 while (node != NULL) { |
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1050 QueueNode* next = node->next(); |
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1051 node->set_next(prev); |
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1052 prev = node; |
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1053 node = next; |
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1054 } |
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1055 new_head = prev; |
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1056 |
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1057 // Now append the new list to the queue |
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1058 if (_queue_tail != NULL) { |
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1059 _queue_tail->set_next(new_head); |
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1060 } else { // _queue_head == NULL |
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1061 _queue_head = new_head; |
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1062 } |
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1063 _queue_tail = new_tail; |
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1064 } |
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1065 } |
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1066 } |
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1067 |
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1068 enum { |
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1069 // Random - used for debugging |
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1070 FLUSHING = 0x50403020, |
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1071 FLUSHED = 0x09080706 |
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1072 }; |
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1073 |
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1074 void JvmtiDeferredEventQueue::flush_queue(Thread* thread) { |
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1075 |
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1076 volatile int flush_state = FLUSHING; |
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1077 |
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1078 JvmtiDeferredEvent flush(JvmtiDeferredEvent::TYPE_FLUSH); |
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1079 flush.set_flush_state_addr((int*)&flush_state); |
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1080 |
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1081 if (ServiceThread::is_service_thread(thread)) { |
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1082 // If we are the service thread we have to post all preceding events |
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1083 // Use the flush event as a token to indicate when we can stop |
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1084 JvmtiDeferredEvent event; |
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1085 { |
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1086 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); |
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1087 enqueue(flush); |
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1088 event = dequeue(); |
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1089 } |
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1090 while (!event.is_flush_event() || |
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1091 event.flush_state_addr() != &flush_state) { |
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1092 event.post(); |
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1093 { |
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1094 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); |
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1095 event = dequeue(); |
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1096 } |
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1097 } |
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1098 } else { |
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1099 // Wake up the service thread so it will process events. When it gets |
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1100 // to the flush event it will set 'flush_complete' and notify us. |
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1101 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); |
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1102 enqueue(flush); |
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1103 while (flush_state != FLUSHED) { |
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1104 assert(flush_state == FLUSHING || flush_state == FLUSHED, |
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1105 "only valid values for this"); |
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1106 Service_lock->wait(Mutex::_no_safepoint_check_flag); |
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1107 } |
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1108 } |
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1109 } |
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1110 |
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1111 void JvmtiDeferredEventQueue::flush_complete(int* state_addr) { |
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1112 assert(state_addr != NULL && *state_addr == FLUSHING, "must be"); |
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1113 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); |
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1114 *state_addr = FLUSHED; |
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1115 Service_lock->notify_all(); |
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1116 } |
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1117 |
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1118 #endif // ndef KERNEL |