Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiImpl.cpp @ 6275:957c266d8bc5
Merge with http://hg.openjdk.java.net/hsx/hsx24/hotspot/
| author | Doug Simon <doug.simon@oracle.com> |
|---|---|
| date | Tue, 21 Aug 2012 10:39:19 +0200 |
| parents | 0ebca2e35ca5 d2a62e0f25eb |
| children | e522a00b91aa |
| 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/os.hpp" |
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42 #include "runtime/serviceThread.hpp" |
| 1972 | 43 #include "runtime/signature.hpp" |
| 44 #include "runtime/vframe.hpp" | |
| 45 #include "runtime/vframe_hp.hpp" | |
| 46 #include "runtime/vm_operations.hpp" | |
| 47 #include "utilities/exceptions.hpp" | |
| 48 #ifdef TARGET_OS_FAMILY_linux | |
| 49 # include "thread_linux.inline.hpp" | |
| 50 #endif | |
| 51 #ifdef TARGET_OS_FAMILY_solaris | |
| 52 # include "thread_solaris.inline.hpp" | |
| 53 #endif | |
| 54 #ifdef TARGET_OS_FAMILY_windows | |
| 55 # include "thread_windows.inline.hpp" | |
| 56 #endif | |
| 3960 | 57 #ifdef TARGET_OS_FAMILY_bsd |
| 58 # include "thread_bsd.inline.hpp" | |
| 59 #endif | |
| 0 | 60 |
| 61 // | |
| 62 // class JvmtiAgentThread | |
| 63 // | |
| 64 // JavaThread used to wrap a thread started by an agent | |
| 65 // using the JVMTI method RunAgentThread. | |
| 66 // | |
| 67 | |
| 68 JvmtiAgentThread::JvmtiAgentThread(JvmtiEnv* env, jvmtiStartFunction start_fn, const void *start_arg) | |
| 69 : JavaThread(start_function_wrapper) { | |
| 70 _env = env; | |
| 71 _start_fn = start_fn; | |
| 72 _start_arg = start_arg; | |
| 73 } | |
| 74 | |
| 75 void | |
| 76 JvmtiAgentThread::start_function_wrapper(JavaThread *thread, TRAPS) { | |
| 77 // It is expected that any Agent threads will be created as | |
| 78 // Java Threads. If this is the case, notification of the creation | |
| 79 // of the thread is given in JavaThread::thread_main(). | |
| 80 assert(thread->is_Java_thread(), "debugger thread should be a Java Thread"); | |
| 81 assert(thread == JavaThread::current(), "sanity check"); | |
| 82 | |
| 83 JvmtiAgentThread *dthread = (JvmtiAgentThread *)thread; | |
| 84 dthread->call_start_function(); | |
| 85 } | |
| 86 | |
| 87 void | |
| 88 JvmtiAgentThread::call_start_function() { | |
| 89 ThreadToNativeFromVM transition(this); | |
| 90 _start_fn(_env->jvmti_external(), jni_environment(), (void*)_start_arg); | |
| 91 } | |
| 92 | |
| 93 | |
| 94 // | |
| 95 // class GrowableCache - private methods | |
| 96 // | |
| 97 | |
| 98 void GrowableCache::recache() { | |
| 99 int len = _elements->length(); | |
| 100 | |
| 6197 | 101 FREE_C_HEAP_ARRAY(address, _cache, mtInternal); |
| 102 _cache = NEW_C_HEAP_ARRAY(address,len+1, mtInternal); | |
| 0 | 103 |
| 104 for (int i=0; i<len; i++) { | |
| 105 _cache[i] = _elements->at(i)->getCacheValue(); | |
| 106 // | |
| 107 // The cache entry has gone bad. Without a valid frame pointer | |
| 108 // value, the entry is useless so we simply delete it in product | |
| 109 // mode. The call to remove() will rebuild the cache again | |
| 110 // without the bad entry. | |
| 111 // | |
| 112 if (_cache[i] == NULL) { | |
| 113 assert(false, "cannot recache NULL elements"); | |
| 114 remove(i); | |
| 115 return; | |
| 116 } | |
| 117 } | |
| 118 _cache[len] = NULL; | |
| 119 | |
| 120 _listener_fun(_this_obj,_cache); | |
| 121 } | |
| 122 | |
| 123 bool GrowableCache::equals(void* v, GrowableElement *e2) { | |
| 124 GrowableElement *e1 = (GrowableElement *) v; | |
| 125 assert(e1 != NULL, "e1 != NULL"); | |
| 126 assert(e2 != NULL, "e2 != NULL"); | |
| 127 | |
| 128 return e1->equals(e2); | |
| 129 } | |
| 130 | |
| 131 // | |
| 132 // class GrowableCache - public methods | |
| 133 // | |
| 134 | |
| 135 GrowableCache::GrowableCache() { | |
| 136 _this_obj = NULL; | |
| 137 _listener_fun = NULL; | |
| 138 _elements = NULL; | |
| 139 _cache = NULL; | |
| 140 } | |
| 141 | |
| 142 GrowableCache::~GrowableCache() { | |
| 143 clear(); | |
| 144 delete _elements; | |
| 6197 | 145 FREE_C_HEAP_ARRAY(address, _cache, mtInternal); |
| 0 | 146 } |
| 147 | |
| 148 void GrowableCache::initialize(void *this_obj, void listener_fun(void *, address*) ) { | |
| 149 _this_obj = this_obj; | |
| 150 _listener_fun = listener_fun; | |
| 6197 | 151 _elements = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<GrowableElement*>(5,true); |
| 0 | 152 recache(); |
| 153 } | |
| 154 | |
| 155 // number of elements in the collection | |
| 156 int GrowableCache::length() { | |
| 157 return _elements->length(); | |
| 158 } | |
| 159 | |
| 160 // get the value of the index element in the collection | |
| 161 GrowableElement* GrowableCache::at(int index) { | |
| 162 GrowableElement *e = (GrowableElement *) _elements->at(index); | |
| 163 assert(e != NULL, "e != NULL"); | |
| 164 return e; | |
| 165 } | |
| 166 | |
| 167 int GrowableCache::find(GrowableElement* e) { | |
| 168 return _elements->find(e, GrowableCache::equals); | |
| 169 } | |
| 170 | |
| 171 // append a copy of the element to the end of the collection | |
| 172 void GrowableCache::append(GrowableElement* e) { | |
| 173 GrowableElement *new_e = e->clone(); | |
| 174 _elements->append(new_e); | |
| 175 recache(); | |
| 176 } | |
| 177 | |
| 178 // insert a copy of the element using lessthan() | |
| 179 void GrowableCache::insert(GrowableElement* e) { | |
| 180 GrowableElement *new_e = e->clone(); | |
| 181 _elements->append(new_e); | |
| 182 | |
| 183 int n = length()-2; | |
| 184 for (int i=n; i>=0; i--) { | |
| 185 GrowableElement *e1 = _elements->at(i); | |
| 186 GrowableElement *e2 = _elements->at(i+1); | |
| 187 if (e2->lessThan(e1)) { | |
| 188 _elements->at_put(i+1, e1); | |
| 189 _elements->at_put(i, e2); | |
| 190 } | |
| 191 } | |
| 192 | |
| 193 recache(); | |
| 194 } | |
| 195 | |
| 196 // remove the element at index | |
| 197 void GrowableCache::remove (int index) { | |
| 198 GrowableElement *e = _elements->at(index); | |
| 199 assert(e != NULL, "e != NULL"); | |
| 200 _elements->remove(e); | |
| 201 delete e; | |
| 202 recache(); | |
| 203 } | |
| 204 | |
| 205 // clear out all elements, release all heap space and | |
| 206 // let our listener know that things have changed. | |
| 207 void GrowableCache::clear() { | |
| 208 int len = _elements->length(); | |
| 209 for (int i=0; i<len; i++) { | |
| 210 delete _elements->at(i); | |
| 211 } | |
| 212 _elements->clear(); | |
| 213 recache(); | |
| 214 } | |
| 215 | |
| 216 void GrowableCache::oops_do(OopClosure* f) { | |
| 217 int len = _elements->length(); | |
| 218 for (int i=0; i<len; i++) { | |
| 219 GrowableElement *e = _elements->at(i); | |
| 220 e->oops_do(f); | |
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221 } |
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222 } |
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223 |
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224 void GrowableCache::gc_epilogue() { |
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225 int len = _elements->length(); |
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226 for (int i=0; i<len; i++) { |
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227 _cache[i] = _elements->at(i)->getCacheValue(); |
| 0 | 228 } |
| 229 } | |
| 230 | |
| 231 // | |
| 232 // class JvmtiBreakpoint | |
| 233 // | |
| 234 | |
| 235 JvmtiBreakpoint::JvmtiBreakpoint() { | |
| 236 _method = NULL; | |
| 237 _bci = 0; | |
| 238 #ifdef CHECK_UNHANDLED_OOPS | |
| 239 // This one is always allocated with new, but check it just in case. | |
| 240 Thread *thread = Thread::current(); | |
| 241 if (thread->is_in_stack((address)&_method)) { | |
| 242 thread->allow_unhandled_oop((oop*)&_method); | |
| 243 } | |
| 244 #endif // CHECK_UNHANDLED_OOPS | |
| 245 } | |
| 246 | |
| 247 JvmtiBreakpoint::JvmtiBreakpoint(methodOop m_method, jlocation location) { | |
| 248 _method = m_method; | |
| 249 assert(_method != NULL, "_method != NULL"); | |
| 250 _bci = (int) location; | |
| 251 #ifdef CHECK_UNHANDLED_OOPS | |
| 252 // Could be allocated with new and wouldn't be on the unhandled oop list. | |
| 253 Thread *thread = Thread::current(); | |
| 254 if (thread->is_in_stack((address)&_method)) { | |
| 255 thread->allow_unhandled_oop(&_method); | |
| 256 } | |
| 257 #endif // CHECK_UNHANDLED_OOPS | |
| 258 | |
| 259 assert(_bci >= 0, "_bci >= 0"); | |
| 260 } | |
| 261 | |
| 262 void JvmtiBreakpoint::copy(JvmtiBreakpoint& bp) { | |
| 263 _method = bp._method; | |
| 264 _bci = bp._bci; | |
| 265 } | |
| 266 | |
| 267 bool JvmtiBreakpoint::lessThan(JvmtiBreakpoint& bp) { | |
| 268 Unimplemented(); | |
| 269 return false; | |
| 270 } | |
| 271 | |
| 272 bool JvmtiBreakpoint::equals(JvmtiBreakpoint& bp) { | |
| 273 return _method == bp._method | |
| 274 && _bci == bp._bci; | |
| 275 } | |
| 276 | |
| 277 bool JvmtiBreakpoint::is_valid() { | |
| 278 return _method != NULL && | |
| 279 _bci >= 0; | |
| 280 } | |
| 281 | |
| 282 address JvmtiBreakpoint::getBcp() { | |
| 283 return _method->bcp_from(_bci); | |
| 284 } | |
| 285 | |
| 286 void JvmtiBreakpoint::each_method_version_do(method_action meth_act) { | |
| 287 ((methodOopDesc*)_method->*meth_act)(_bci); | |
| 288 | |
| 289 // add/remove breakpoint to/from versions of the method that | |
| 290 // are EMCP. Directly or transitively obsolete methods are | |
| 291 // not saved in the PreviousVersionInfo. | |
| 292 Thread *thread = Thread::current(); | |
| 293 instanceKlassHandle ikh = instanceKlassHandle(thread, _method->method_holder()); | |
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294 Symbol* m_name = _method->name(); |
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295 Symbol* m_signature = _method->signature(); |
| 0 | 296 |
| 297 { | |
| 298 ResourceMark rm(thread); | |
| 299 // PreviousVersionInfo objects returned via PreviousVersionWalker | |
| 300 // contain a GrowableArray of handles. We have to clean up the | |
| 301 // GrowableArray _after_ the PreviousVersionWalker destructor | |
| 302 // has destroyed the handles. | |
| 303 { | |
| 304 // search previous versions if they exist | |
| 305 PreviousVersionWalker pvw((instanceKlass *)ikh()->klass_part()); | |
| 306 for (PreviousVersionInfo * pv_info = pvw.next_previous_version(); | |
| 307 pv_info != NULL; pv_info = pvw.next_previous_version()) { | |
| 308 GrowableArray<methodHandle>* methods = | |
| 309 pv_info->prev_EMCP_method_handles(); | |
| 310 | |
| 311 if (methods == NULL) { | |
| 312 // We have run into a PreviousVersion generation where | |
| 313 // all methods were made obsolete during that generation's | |
| 314 // RedefineClasses() operation. At the time of that | |
| 315 // operation, all EMCP methods were flushed so we don't | |
| 316 // have to go back any further. | |
| 317 // | |
| 318 // A NULL methods array is different than an empty methods | |
| 319 // array. We cannot infer any optimizations about older | |
| 320 // generations from an empty methods array for the current | |
| 321 // generation. | |
| 322 break; | |
| 323 } | |
| 324 | |
| 325 for (int i = methods->length() - 1; i >= 0; i--) { | |
| 326 methodHandle method = methods->at(i); | |
| 327 if (method->name() == m_name && method->signature() == m_signature) { | |
| 328 RC_TRACE(0x00000800, ("%sing breakpoint in %s(%s)", | |
| 329 meth_act == &methodOopDesc::set_breakpoint ? "sett" : "clear", | |
| 330 method->name()->as_C_string(), | |
| 331 method->signature()->as_C_string())); | |
| 332 assert(!method->is_obsolete(), "only EMCP methods here"); | |
| 333 | |
| 334 ((methodOopDesc*)method()->*meth_act)(_bci); | |
| 335 break; | |
| 336 } | |
| 337 } | |
| 338 } | |
| 339 } // pvw is cleaned up | |
| 340 } // rm is cleaned up | |
| 341 } | |
| 342 | |
| 343 void JvmtiBreakpoint::set() { | |
| 344 each_method_version_do(&methodOopDesc::set_breakpoint); | |
| 345 } | |
| 346 | |
| 347 void JvmtiBreakpoint::clear() { | |
| 348 each_method_version_do(&methodOopDesc::clear_breakpoint); | |
| 349 } | |
| 350 | |
| 351 void JvmtiBreakpoint::print() { | |
| 352 #ifndef PRODUCT | |
| 353 const char *class_name = (_method == NULL) ? "NULL" : _method->klass_name()->as_C_string(); | |
| 354 const char *method_name = (_method == NULL) ? "NULL" : _method->name()->as_C_string(); | |
| 355 | |
| 356 tty->print("Breakpoint(%s,%s,%d,%p)",class_name, method_name, _bci, getBcp()); | |
| 357 #endif | |
| 358 } | |
| 359 | |
| 360 | |
| 361 // | |
| 362 // class VM_ChangeBreakpoints | |
| 363 // | |
| 364 // Modify the Breakpoints data structure at a safepoint | |
| 365 // | |
| 366 | |
| 367 void VM_ChangeBreakpoints::doit() { | |
| 368 switch (_operation) { | |
| 369 case SET_BREAKPOINT: | |
| 370 _breakpoints->set_at_safepoint(*_bp); | |
| 371 break; | |
| 372 case CLEAR_BREAKPOINT: | |
| 373 _breakpoints->clear_at_safepoint(*_bp); | |
| 374 break; | |
| 375 case CLEAR_ALL_BREAKPOINT: | |
| 376 _breakpoints->clearall_at_safepoint(); | |
| 377 break; | |
| 378 default: | |
| 379 assert(false, "Unknown operation"); | |
| 380 } | |
| 381 } | |
| 382 | |
| 383 void VM_ChangeBreakpoints::oops_do(OopClosure* f) { | |
| 384 // This operation keeps breakpoints alive | |
| 385 if (_breakpoints != NULL) { | |
| 386 _breakpoints->oops_do(f); | |
| 387 } | |
| 388 if (_bp != NULL) { | |
| 389 _bp->oops_do(f); | |
| 390 } | |
| 391 } | |
| 392 | |
| 393 // | |
| 394 // class JvmtiBreakpoints | |
| 395 // | |
| 396 // a JVMTI internal collection of JvmtiBreakpoint | |
| 397 // | |
| 398 | |
| 399 JvmtiBreakpoints::JvmtiBreakpoints(void listener_fun(void *,address *)) { | |
| 400 _bps.initialize(this,listener_fun); | |
| 401 } | |
| 402 | |
| 403 JvmtiBreakpoints:: ~JvmtiBreakpoints() {} | |
| 404 | |
| 405 void JvmtiBreakpoints::oops_do(OopClosure* f) { | |
| 406 _bps.oops_do(f); | |
| 407 } | |
| 408 | |
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409 void JvmtiBreakpoints::gc_epilogue() { |
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410 _bps.gc_epilogue(); |
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411 } |
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412 |
| 0 | 413 void JvmtiBreakpoints::print() { |
| 414 #ifndef PRODUCT | |
| 415 ResourceMark rm; | |
| 416 | |
| 417 int n = _bps.length(); | |
| 418 for (int i=0; i<n; i++) { | |
| 419 JvmtiBreakpoint& bp = _bps.at(i); | |
| 420 tty->print("%d: ", i); | |
| 421 bp.print(); | |
| 422 tty->print_cr(""); | |
| 423 } | |
| 424 #endif | |
| 425 } | |
| 426 | |
| 427 | |
| 428 void JvmtiBreakpoints::set_at_safepoint(JvmtiBreakpoint& bp) { | |
| 429 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
| 430 | |
| 431 int i = _bps.find(bp); | |
| 432 if (i == -1) { | |
| 433 _bps.append(bp); | |
| 434 bp.set(); | |
| 435 } | |
| 436 } | |
| 437 | |
| 438 void JvmtiBreakpoints::clear_at_safepoint(JvmtiBreakpoint& bp) { | |
| 439 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
| 440 | |
| 441 int i = _bps.find(bp); | |
| 442 if (i != -1) { | |
| 443 _bps.remove(i); | |
| 444 bp.clear(); | |
| 445 } | |
| 446 } | |
| 447 | |
| 448 void JvmtiBreakpoints::clearall_at_safepoint() { | |
| 449 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
| 450 | |
| 451 int len = _bps.length(); | |
| 452 for (int i=0; i<len; i++) { | |
| 453 _bps.at(i).clear(); | |
| 454 } | |
| 455 _bps.clear(); | |
| 456 } | |
| 457 | |
| 458 int JvmtiBreakpoints::length() { return _bps.length(); } | |
| 459 | |
| 460 int JvmtiBreakpoints::set(JvmtiBreakpoint& bp) { | |
| 461 if ( _bps.find(bp) != -1) { | |
| 462 return JVMTI_ERROR_DUPLICATE; | |
| 463 } | |
| 464 VM_ChangeBreakpoints set_breakpoint(this,VM_ChangeBreakpoints::SET_BREAKPOINT, &bp); | |
| 465 VMThread::execute(&set_breakpoint); | |
| 466 return JVMTI_ERROR_NONE; | |
| 467 } | |
| 468 | |
| 469 int JvmtiBreakpoints::clear(JvmtiBreakpoint& bp) { | |
| 470 if ( _bps.find(bp) == -1) { | |
| 471 return JVMTI_ERROR_NOT_FOUND; | |
| 472 } | |
| 473 | |
| 474 VM_ChangeBreakpoints clear_breakpoint(this,VM_ChangeBreakpoints::CLEAR_BREAKPOINT, &bp); | |
| 475 VMThread::execute(&clear_breakpoint); | |
| 476 return JVMTI_ERROR_NONE; | |
| 477 } | |
| 478 | |
| 479 void JvmtiBreakpoints::clearall_in_class_at_safepoint(klassOop klass) { | |
| 480 bool changed = true; | |
| 481 // We are going to run thru the list of bkpts | |
| 482 // and delete some. This deletion probably alters | |
| 483 // the list in some implementation defined way such | |
| 484 // that when we delete entry i, the next entry might | |
| 485 // no longer be at i+1. To be safe, each time we delete | |
| 486 // an entry, we'll just start again from the beginning. | |
| 487 // We'll stop when we make a pass thru the whole list without | |
| 488 // deleting anything. | |
| 489 while (changed) { | |
| 490 int len = _bps.length(); | |
| 491 changed = false; | |
| 492 for (int i = 0; i < len; i++) { | |
| 493 JvmtiBreakpoint& bp = _bps.at(i); | |
| 494 if (bp.method()->method_holder() == klass) { | |
| 495 bp.clear(); | |
| 496 _bps.remove(i); | |
| 497 // This changed 'i' so we have to start over. | |
| 498 changed = true; | |
| 499 break; | |
| 500 } | |
| 501 } | |
| 502 } | |
| 503 } | |
| 504 | |
| 505 void JvmtiBreakpoints::clearall() { | |
| 506 VM_ChangeBreakpoints clearall_breakpoint(this,VM_ChangeBreakpoints::CLEAR_ALL_BREAKPOINT); | |
| 507 VMThread::execute(&clearall_breakpoint); | |
| 508 } | |
| 509 | |
| 510 // | |
| 511 // class JvmtiCurrentBreakpoints | |
| 512 // | |
| 513 | |
| 514 JvmtiBreakpoints *JvmtiCurrentBreakpoints::_jvmti_breakpoints = NULL; | |
| 515 address * JvmtiCurrentBreakpoints::_breakpoint_list = NULL; | |
| 516 | |
| 517 | |
| 518 JvmtiBreakpoints& JvmtiCurrentBreakpoints::get_jvmti_breakpoints() { | |
| 519 if (_jvmti_breakpoints != NULL) return (*_jvmti_breakpoints); | |
| 520 _jvmti_breakpoints = new JvmtiBreakpoints(listener_fun); | |
| 521 assert(_jvmti_breakpoints != NULL, "_jvmti_breakpoints != NULL"); | |
| 522 return (*_jvmti_breakpoints); | |
| 523 } | |
| 524 | |
| 525 void JvmtiCurrentBreakpoints::listener_fun(void *this_obj, address *cache) { | |
| 526 JvmtiBreakpoints *this_jvmti = (JvmtiBreakpoints *) this_obj; | |
| 527 assert(this_jvmti != NULL, "this_jvmti != NULL"); | |
| 528 | |
| 529 debug_only(int n = this_jvmti->length();); | |
| 530 assert(cache[n] == NULL, "cache must be NULL terminated"); | |
| 531 | |
| 532 set_breakpoint_list(cache); | |
| 533 } | |
| 534 | |
| 535 | |
| 536 void JvmtiCurrentBreakpoints::oops_do(OopClosure* f) { | |
| 537 if (_jvmti_breakpoints != NULL) { | |
| 538 _jvmti_breakpoints->oops_do(f); | |
| 539 } | |
| 540 } | |
| 541 | |
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542 void JvmtiCurrentBreakpoints::gc_epilogue() { |
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543 if (_jvmti_breakpoints != NULL) { |
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544 _jvmti_breakpoints->gc_epilogue(); |
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545 } |
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546 } |
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547 |
| 0 | 548 /////////////////////////////////////////////////////////////// |
| 549 // | |
| 550 // class VM_GetOrSetLocal | |
| 551 // | |
| 552 | |
| 553 // Constructor for non-object getter | |
| 554 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type) | |
| 555 : _thread(thread) | |
| 556 , _calling_thread(NULL) | |
| 557 , _depth(depth) | |
| 558 , _index(index) | |
| 559 , _type(type) | |
| 560 , _set(false) | |
| 561 , _jvf(NULL) | |
| 562 , _result(JVMTI_ERROR_NONE) | |
| 563 { | |
| 564 } | |
| 565 | |
| 566 // Constructor for object or non-object setter | |
| 567 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type, jvalue value) | |
| 568 : _thread(thread) | |
| 569 , _calling_thread(NULL) | |
| 570 , _depth(depth) | |
| 571 , _index(index) | |
| 572 , _type(type) | |
| 573 , _value(value) | |
| 574 , _set(true) | |
| 575 , _jvf(NULL) | |
| 576 , _result(JVMTI_ERROR_NONE) | |
| 577 { | |
| 578 } | |
| 579 | |
| 580 // Constructor for object getter | |
| 581 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, JavaThread* calling_thread, jint depth, int index) | |
| 582 : _thread(thread) | |
| 583 , _calling_thread(calling_thread) | |
| 584 , _depth(depth) | |
| 585 , _index(index) | |
| 586 , _type(T_OBJECT) | |
| 587 , _set(false) | |
| 588 , _jvf(NULL) | |
| 589 , _result(JVMTI_ERROR_NONE) | |
| 590 { | |
| 591 } | |
| 592 | |
| 593 vframe *VM_GetOrSetLocal::get_vframe() { | |
| 594 if (!_thread->has_last_Java_frame()) { | |
| 595 return NULL; | |
| 596 } | |
| 597 RegisterMap reg_map(_thread); | |
| 598 vframe *vf = _thread->last_java_vframe(®_map); | |
| 599 int d = 0; | |
| 600 while ((vf != NULL) && (d < _depth)) { | |
| 601 vf = vf->java_sender(); | |
| 602 d++; | |
| 603 } | |
| 604 return vf; | |
| 605 } | |
| 606 | |
| 607 javaVFrame *VM_GetOrSetLocal::get_java_vframe() { | |
| 608 vframe* vf = get_vframe(); | |
| 609 if (vf == NULL) { | |
| 610 _result = JVMTI_ERROR_NO_MORE_FRAMES; | |
| 611 return NULL; | |
| 612 } | |
| 613 javaVFrame *jvf = (javaVFrame*)vf; | |
| 614 | |
| 2019 | 615 if (!vf->is_java_frame()) { |
| 0 | 616 _result = JVMTI_ERROR_OPAQUE_FRAME; |
| 617 return NULL; | |
| 618 } | |
| 619 return jvf; | |
| 620 } | |
| 621 | |
| 622 // Check that the klass is assignable to a type with the given signature. | |
| 623 // Another solution could be to use the function Klass::is_subtype_of(type). | |
| 624 // But the type class can be forced to load/initialize eagerly in such a case. | |
| 625 // This may cause unexpected consequences like CFLH or class-init JVMTI events. | |
| 626 // It is better to avoid such a behavior. | |
| 627 bool VM_GetOrSetLocal::is_assignable(const char* ty_sign, Klass* klass, Thread* thread) { | |
| 628 assert(ty_sign != NULL, "type signature must not be NULL"); | |
| 629 assert(thread != NULL, "thread must not be NULL"); | |
| 630 assert(klass != NULL, "klass must not be NULL"); | |
| 631 | |
| 632 int len = (int) strlen(ty_sign); | |
| 633 if (ty_sign[0] == 'L' && ty_sign[len-1] == ';') { // Need pure class/interface name | |
| 634 ty_sign++; | |
| 635 len -= 2; | |
| 636 } | |
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637 TempNewSymbol ty_sym = SymbolTable::new_symbol(ty_sign, len, thread); |
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638 if (klass->name() == ty_sym) { |
| 0 | 639 return true; |
| 640 } | |
| 641 // Compare primary supers | |
| 642 int super_depth = klass->super_depth(); | |
| 643 int idx; | |
| 644 for (idx = 0; idx < super_depth; idx++) { | |
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645 if (Klass::cast(klass->primary_super_of_depth(idx))->name() == ty_sym) { |
| 0 | 646 return true; |
| 647 } | |
| 648 } | |
| 649 // Compare secondary supers | |
| 650 objArrayOop sec_supers = klass->secondary_supers(); | |
| 651 for (idx = 0; idx < sec_supers->length(); idx++) { | |
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652 if (Klass::cast((klassOop) sec_supers->obj_at(idx))->name() == ty_sym) { |
| 0 | 653 return true; |
| 654 } | |
| 655 } | |
| 656 return false; | |
| 657 } | |
| 658 | |
| 659 // Checks error conditions: | |
| 660 // JVMTI_ERROR_INVALID_SLOT | |
| 661 // JVMTI_ERROR_TYPE_MISMATCH | |
| 662 // Returns: 'true' - everything is Ok, 'false' - error code | |
| 663 | |
| 664 bool VM_GetOrSetLocal::check_slot_type(javaVFrame* jvf) { | |
| 665 methodOop method_oop = jvf->method(); | |
| 666 if (!method_oop->has_localvariable_table()) { | |
| 667 // Just to check index boundaries | |
| 668 jint extra_slot = (_type == T_LONG || _type == T_DOUBLE) ? 1 : 0; | |
| 669 if (_index < 0 || _index + extra_slot >= method_oop->max_locals()) { | |
| 670 _result = JVMTI_ERROR_INVALID_SLOT; | |
| 671 return false; | |
| 672 } | |
| 673 return true; | |
| 674 } | |
| 675 | |
| 676 jint num_entries = method_oop->localvariable_table_length(); | |
| 677 if (num_entries == 0) { | |
| 678 _result = JVMTI_ERROR_INVALID_SLOT; | |
| 679 return false; // There are no slots | |
| 680 } | |
| 681 int signature_idx = -1; | |
| 682 int vf_bci = jvf->bci(); | |
| 683 LocalVariableTableElement* table = method_oop->localvariable_table_start(); | |
| 684 for (int i = 0; i < num_entries; i++) { | |
| 685 int start_bci = table[i].start_bci; | |
| 686 int end_bci = start_bci + table[i].length; | |
| 687 | |
| 688 // Here we assume that locations of LVT entries | |
| 689 // with the same slot number cannot be overlapped | |
| 690 if (_index == (jint) table[i].slot && start_bci <= vf_bci && vf_bci <= end_bci) { | |
| 691 signature_idx = (int) table[i].descriptor_cp_index; | |
| 692 break; | |
| 693 } | |
| 694 } | |
| 695 if (signature_idx == -1) { | |
| 696 _result = JVMTI_ERROR_INVALID_SLOT; | |
| 697 return false; // Incorrect slot index | |
| 698 } | |
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699 Symbol* sign_sym = method_oop->constants()->symbol_at(signature_idx); |
| 0 | 700 const char* signature = (const char *) sign_sym->as_utf8(); |
| 701 BasicType slot_type = char2type(signature[0]); | |
| 702 | |
| 703 switch (slot_type) { | |
| 704 case T_BYTE: | |
| 705 case T_SHORT: | |
| 706 case T_CHAR: | |
| 707 case T_BOOLEAN: | |
| 708 slot_type = T_INT; | |
| 709 break; | |
| 710 case T_ARRAY: | |
| 711 slot_type = T_OBJECT; | |
| 712 break; | |
| 713 }; | |
| 714 if (_type != slot_type) { | |
| 715 _result = JVMTI_ERROR_TYPE_MISMATCH; | |
| 716 return false; | |
| 717 } | |
| 718 | |
| 719 jobject jobj = _value.l; | |
| 720 if (_set && slot_type == T_OBJECT && jobj != NULL) { // NULL reference is allowed | |
| 721 // Check that the jobject class matches the return type signature. | |
| 722 JavaThread* cur_thread = JavaThread::current(); | |
| 723 HandleMark hm(cur_thread); | |
| 724 | |
| 725 Handle obj = Handle(cur_thread, JNIHandles::resolve_external_guard(jobj)); | |
| 726 NULL_CHECK(obj, (_result = JVMTI_ERROR_INVALID_OBJECT, false)); | |
| 727 KlassHandle ob_kh = KlassHandle(cur_thread, obj->klass()); | |
| 728 NULL_CHECK(ob_kh, (_result = JVMTI_ERROR_INVALID_OBJECT, false)); | |
| 729 | |
| 730 if (!is_assignable(signature, Klass::cast(ob_kh()), cur_thread)) { | |
| 731 _result = JVMTI_ERROR_TYPE_MISMATCH; | |
| 732 return false; | |
| 733 } | |
| 734 } | |
| 735 return true; | |
| 736 } | |
| 737 | |
| 738 static bool can_be_deoptimized(vframe* vf) { | |
| 739 return (vf->is_compiled_frame() && vf->fr().can_be_deoptimized()); | |
| 740 } | |
| 741 | |
| 742 bool VM_GetOrSetLocal::doit_prologue() { | |
| 743 _jvf = get_java_vframe(); | |
| 744 NULL_CHECK(_jvf, false); | |
| 745 | |
| 2019 | 746 if (_jvf->method()->is_native()) { |
| 747 if (getting_receiver() && !_jvf->method()->is_static()) { | |
| 748 return true; | |
| 749 } else { | |
| 750 _result = JVMTI_ERROR_OPAQUE_FRAME; | |
| 751 return false; | |
| 752 } | |
| 753 } | |
| 754 | |
| 0 | 755 if (!check_slot_type(_jvf)) { |
| 756 return false; | |
| 757 } | |
| 758 return true; | |
| 759 } | |
| 760 | |
| 761 void VM_GetOrSetLocal::doit() { | |
| 762 if (_set) { | |
| 763 // Force deoptimization of frame if compiled because it's | |
| 764 // possible the compiler emitted some locals as constant values, | |
| 765 // meaning they are not mutable. | |
| 766 if (can_be_deoptimized(_jvf)) { | |
| 767 | |
| 768 // Schedule deoptimization so that eventually the local | |
| 769 // update will be written to an interpreter frame. | |
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770 Deoptimization::deoptimize_frame(_jvf->thread(), _jvf->fr().id(), Deoptimization::Reason_constraint); |
| 0 | 771 |
| 772 // Now store a new value for the local which will be applied | |
| 773 // once deoptimization occurs. Note however that while this | |
| 774 // write is deferred until deoptimization actually happens | |
| 775 // can vframe created after this point will have its locals | |
| 776 // reflecting this update so as far as anyone can see the | |
| 777 // write has already taken place. | |
| 778 | |
| 779 // If we are updating an oop then get the oop from the handle | |
| 780 // since the handle will be long gone by the time the deopt | |
| 781 // happens. The oop stored in the deferred local will be | |
| 782 // gc'd on its own. | |
| 783 if (_type == T_OBJECT) { | |
| 784 _value.l = (jobject) (JNIHandles::resolve_external_guard(_value.l)); | |
| 785 } | |
| 786 // Re-read the vframe so we can see that it is deoptimized | |
| 787 // [ Only need because of assert in update_local() ] | |
| 788 _jvf = get_java_vframe(); | |
| 789 ((compiledVFrame*)_jvf)->update_local(_type, _index, _value); | |
| 790 return; | |
| 791 } | |
| 792 StackValueCollection *locals = _jvf->locals(); | |
| 793 HandleMark hm; | |
| 794 | |
| 795 switch (_type) { | |
| 2019 | 796 case T_INT: locals->set_int_at (_index, _value.i); break; |
| 797 case T_LONG: locals->set_long_at (_index, _value.j); break; | |
| 798 case T_FLOAT: locals->set_float_at (_index, _value.f); break; | |
| 799 case T_DOUBLE: locals->set_double_at(_index, _value.d); break; | |
| 800 case T_OBJECT: { | |
| 801 Handle ob_h(JNIHandles::resolve_external_guard(_value.l)); | |
| 802 locals->set_obj_at (_index, ob_h); | |
| 803 break; | |
| 804 } | |
| 805 default: ShouldNotReachHere(); | |
| 0 | 806 } |
| 807 _jvf->set_locals(locals); | |
| 808 } else { | |
| 2019 | 809 if (_jvf->method()->is_native() && _jvf->is_compiled_frame()) { |
| 810 assert(getting_receiver(), "Can only get here when getting receiver"); | |
| 811 oop receiver = _jvf->fr().get_native_receiver(); | |
| 812 _value.l = JNIHandles::make_local(_calling_thread, receiver); | |
| 813 } else { | |
| 814 StackValueCollection *locals = _jvf->locals(); | |
| 0 | 815 |
| 2019 | 816 if (locals->at(_index)->type() == T_CONFLICT) { |
| 817 memset(&_value, 0, sizeof(_value)); | |
| 818 _value.l = NULL; | |
| 819 return; | |
| 820 } | |
| 0 | 821 |
| 2019 | 822 switch (_type) { |
| 823 case T_INT: _value.i = locals->int_at (_index); break; | |
| 824 case T_LONG: _value.j = locals->long_at (_index); break; | |
| 825 case T_FLOAT: _value.f = locals->float_at (_index); break; | |
| 826 case T_DOUBLE: _value.d = locals->double_at(_index); break; | |
| 827 case T_OBJECT: { | |
| 828 // Wrap the oop to be returned in a local JNI handle since | |
| 829 // oops_do() no longer applies after doit() is finished. | |
| 830 oop obj = locals->obj_at(_index)(); | |
| 831 _value.l = JNIHandles::make_local(_calling_thread, obj); | |
| 832 break; | |
| 833 } | |
| 834 default: ShouldNotReachHere(); | |
| 835 } | |
| 0 | 836 } |
| 837 } | |
| 838 } | |
| 839 | |
| 840 | |
| 841 bool VM_GetOrSetLocal::allow_nested_vm_operations() const { | |
| 842 return true; // May need to deoptimize | |
| 843 } | |
| 844 | |
| 845 | |
| 2019 | 846 VM_GetReceiver::VM_GetReceiver( |
| 847 JavaThread* thread, JavaThread* caller_thread, jint depth) | |
| 848 : VM_GetOrSetLocal(thread, caller_thread, depth, 0) {} | |
| 849 | |
| 0 | 850 ///////////////////////////////////////////////////////////////////////////////////////// |
| 851 | |
| 852 // | |
| 853 // class JvmtiSuspendControl - see comments in jvmtiImpl.hpp | |
| 854 // | |
| 855 | |
| 856 bool JvmtiSuspendControl::suspend(JavaThread *java_thread) { | |
| 857 // external suspend should have caught suspending a thread twice | |
| 858 | |
| 859 // Immediate suspension required for JPDA back-end so JVMTI agent threads do | |
| 860 // not deadlock due to later suspension on transitions while holding | |
| 861 // raw monitors. Passing true causes the immediate suspension. | |
| 862 // java_suspend() will catch threads in the process of exiting | |
| 863 // and will ignore them. | |
| 864 java_thread->java_suspend(); | |
| 865 | |
| 866 // It would be nice to have the following assertion in all the time, | |
| 867 // but it is possible for a racing resume request to have resumed | |
| 868 // this thread right after we suspended it. Temporarily enable this | |
| 869 // assertion if you are chasing a different kind of bug. | |
| 870 // | |
| 871 // assert(java_lang_Thread::thread(java_thread->threadObj()) == NULL || | |
| 872 // java_thread->is_being_ext_suspended(), "thread is not suspended"); | |
| 873 | |
| 874 if (java_lang_Thread::thread(java_thread->threadObj()) == NULL) { | |
| 875 // check again because we can get delayed in java_suspend(): | |
| 876 // the thread is in process of exiting. | |
| 877 return false; | |
| 878 } | |
| 879 | |
| 880 return true; | |
| 881 } | |
| 882 | |
| 883 bool JvmtiSuspendControl::resume(JavaThread *java_thread) { | |
| 884 // external suspend should have caught resuming a thread twice | |
| 885 assert(java_thread->is_being_ext_suspended(), "thread should be suspended"); | |
| 886 | |
| 887 // resume thread | |
| 888 { | |
| 889 // must always grab Threads_lock, see JVM_SuspendThread | |
| 890 MutexLocker ml(Threads_lock); | |
| 891 java_thread->java_resume(); | |
| 892 } | |
| 893 | |
| 894 return true; | |
| 895 } | |
| 896 | |
| 897 | |
| 898 void JvmtiSuspendControl::print() { | |
| 899 #ifndef PRODUCT | |
| 900 MutexLocker mu(Threads_lock); | |
| 901 ResourceMark rm; | |
| 902 | |
| 903 tty->print("Suspended Threads: ["); | |
| 904 for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) { | |
| 905 #if JVMTI_TRACE | |
| 906 const char *name = JvmtiTrace::safe_get_thread_name(thread); | |
| 907 #else | |
| 908 const char *name = ""; | |
| 909 #endif /*JVMTI_TRACE */ | |
| 910 tty->print("%s(%c ", name, thread->is_being_ext_suspended() ? 'S' : '_'); | |
| 911 if (!thread->has_last_Java_frame()) { | |
| 912 tty->print("no stack"); | |
| 913 } | |
| 914 tty->print(") "); | |
| 915 } | |
| 916 tty->print_cr("]"); | |
| 917 #endif | |
| 918 } | |
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920 #ifndef KERNEL |
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921 |
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922 JvmtiDeferredEvent JvmtiDeferredEvent::compiled_method_load_event( |
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923 nmethod* nm) { |
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924 JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_COMPILED_METHOD_LOAD); |
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925 event._event_data.compiled_method_load = nm; |
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926 // Keep the nmethod alive until the ServiceThread can process |
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927 // this deferred event. |
|
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|
928 nmethodLocker::lock_nmethod(nm); |
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929 return event; |
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930 } |
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931 |
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932 JvmtiDeferredEvent JvmtiDeferredEvent::compiled_method_unload_event( |
|
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933 nmethod* nm, jmethodID id, const void* code) { |
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934 JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_COMPILED_METHOD_UNLOAD); |
|
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935 event._event_data.compiled_method_unload.nm = nm; |
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936 event._event_data.compiled_method_unload.method_id = id; |
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937 event._event_data.compiled_method_unload.code_begin = code; |
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938 // Keep the nmethod alive until the ServiceThread can process |
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939 // this deferred event. This will keep the memory for the |
|
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940 // generated code from being reused too early. We pass |
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941 // zombie_ok == true here so that our nmethod that was just |
|
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942 // made into a zombie can be locked. |
|
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943 nmethodLocker::lock_nmethod(nm, true /* zombie_ok */); |
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944 return event; |
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945 } |
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946 |
|
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947 JvmtiDeferredEvent JvmtiDeferredEvent::dynamic_code_generated_event( |
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948 const char* name, const void* code_begin, const void* code_end) { |
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949 JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_DYNAMIC_CODE_GENERATED); |
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950 // Need to make a copy of the name since we don't know how long |
|
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951 // the event poster will keep it around after we enqueue the |
|
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952 // deferred event and return. strdup() failure is handled in |
|
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953 // the post() routine below. |
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954 event._event_data.dynamic_code_generated.name = os::strdup(name); |
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955 event._event_data.dynamic_code_generated.code_begin = code_begin; |
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956 event._event_data.dynamic_code_generated.code_end = code_end; |
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957 return event; |
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958 } |
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959 |
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960 void JvmtiDeferredEvent::post() { |
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961 assert(ServiceThread::is_service_thread(Thread::current()), |
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962 "Service thread must post enqueued events"); |
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963 switch(_type) { |
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964 case TYPE_COMPILED_METHOD_LOAD: { |
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965 nmethod* nm = _event_data.compiled_method_load; |
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966 JvmtiExport::post_compiled_method_load(nm); |
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967 // done with the deferred event so unlock the nmethod |
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968 nmethodLocker::unlock_nmethod(nm); |
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969 break; |
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970 } |
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971 case TYPE_COMPILED_METHOD_UNLOAD: { |
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972 nmethod* nm = _event_data.compiled_method_unload.nm; |
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973 JvmtiExport::post_compiled_method_unload( |
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974 _event_data.compiled_method_unload.method_id, |
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975 _event_data.compiled_method_unload.code_begin); |
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976 // done with the deferred event so unlock the nmethod |
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977 nmethodLocker::unlock_nmethod(nm); |
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978 break; |
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979 } |
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980 case TYPE_DYNAMIC_CODE_GENERATED: { |
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|
981 JvmtiExport::post_dynamic_code_generated_internal( |
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982 // if strdup failed give the event a default name |
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983 (_event_data.dynamic_code_generated.name == NULL) |
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984 ? "unknown_code" : _event_data.dynamic_code_generated.name, |
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985 _event_data.dynamic_code_generated.code_begin, |
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986 _event_data.dynamic_code_generated.code_end); |
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987 if (_event_data.dynamic_code_generated.name != NULL) { |
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988 // release our copy |
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989 os::free((void *)_event_data.dynamic_code_generated.name); |
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990 } |
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|
991 break; |
|
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992 } |
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993 default: |
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994 ShouldNotReachHere(); |
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995 } |
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|
996 } |
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|
997 |
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998 JvmtiDeferredEventQueue::QueueNode* JvmtiDeferredEventQueue::_queue_tail = NULL; |
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999 JvmtiDeferredEventQueue::QueueNode* JvmtiDeferredEventQueue::_queue_head = NULL; |
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1000 |
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1001 volatile JvmtiDeferredEventQueue::QueueNode* |
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1002 JvmtiDeferredEventQueue::_pending_list = NULL; |
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1003 |
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1004 bool JvmtiDeferredEventQueue::has_events() { |
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1005 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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1006 return _queue_head != NULL || _pending_list != NULL; |
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|
1007 } |
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|
1008 |
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1009 void JvmtiDeferredEventQueue::enqueue(const JvmtiDeferredEvent& event) { |
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1010 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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|
1011 |
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1012 process_pending_events(); |
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1013 |
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1014 // Events get added to the end of the queue (and are pulled off the front). |
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1015 QueueNode* node = new QueueNode(event); |
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1016 if (_queue_tail == NULL) { |
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1017 _queue_tail = _queue_head = node; |
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1018 } else { |
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1019 assert(_queue_tail->next() == NULL, "Must be the last element in the list"); |
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1020 _queue_tail->set_next(node); |
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1021 _queue_tail = node; |
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1022 } |
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|
1023 |
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1024 Service_lock->notify_all(); |
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1025 assert((_queue_head == NULL) == (_queue_tail == NULL), |
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1026 "Inconsistent queue markers"); |
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1027 } |
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1028 |
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1029 JvmtiDeferredEvent JvmtiDeferredEventQueue::dequeue() { |
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1030 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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1031 |
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1032 process_pending_events(); |
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1033 |
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1034 assert(_queue_head != NULL, "Nothing to dequeue"); |
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1035 |
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1036 if (_queue_head == NULL) { |
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1037 // Just in case this happens in product; it shouldn't but let's not crash |
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1038 return JvmtiDeferredEvent(); |
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1039 } |
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1040 |
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1041 QueueNode* node = _queue_head; |
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1042 _queue_head = _queue_head->next(); |
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1043 if (_queue_head == NULL) { |
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1044 _queue_tail = NULL; |
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1045 } |
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1046 |
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1047 assert((_queue_head == NULL) == (_queue_tail == NULL), |
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1048 "Inconsistent queue markers"); |
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1049 |
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1050 JvmtiDeferredEvent event = node->event(); |
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1051 delete node; |
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1052 return event; |
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1053 } |
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1054 |
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1055 void JvmtiDeferredEventQueue::add_pending_event( |
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1056 const JvmtiDeferredEvent& event) { |
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1057 |
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1058 QueueNode* node = new QueueNode(event); |
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1059 |
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1060 bool success = false; |
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1061 QueueNode* prev_value = (QueueNode*)_pending_list; |
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1062 do { |
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1063 node->set_next(prev_value); |
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1064 prev_value = (QueueNode*)Atomic::cmpxchg_ptr( |
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1065 (void*)node, (volatile void*)&_pending_list, (void*)node->next()); |
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1066 } while (prev_value != node->next()); |
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1067 } |
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1068 |
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1069 // This method transfers any events that were added by someone NOT holding |
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1070 // the lock into the mainline queue. |
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1071 void JvmtiDeferredEventQueue::process_pending_events() { |
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1072 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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1073 |
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1074 if (_pending_list != NULL) { |
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1075 QueueNode* head = |
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1076 (QueueNode*)Atomic::xchg_ptr(NULL, (volatile void*)&_pending_list); |
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1077 |
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1078 assert((_queue_head == NULL) == (_queue_tail == NULL), |
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1079 "Inconsistent queue markers"); |
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1080 |
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1081 if (head != NULL) { |
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1082 // Since we've treated the pending list as a stack (with newer |
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1083 // events at the beginning), we need to join the bottom of the stack |
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1084 // with the 'tail' of the queue in order to get the events in the |
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1085 // right order. We do this by reversing the pending list and appending |
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1086 // it to the queue. |
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1087 |
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1088 QueueNode* new_tail = head; |
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1089 QueueNode* new_head = NULL; |
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1090 |
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1091 // This reverses the list |
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1092 QueueNode* prev = new_tail; |
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1093 QueueNode* node = new_tail->next(); |
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1094 new_tail->set_next(NULL); |
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1095 while (node != NULL) { |
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1096 QueueNode* next = node->next(); |
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1097 node->set_next(prev); |
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1098 prev = node; |
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1099 node = next; |
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1100 } |
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1101 new_head = prev; |
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1102 |
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1103 // Now append the new list to the queue |
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1104 if (_queue_tail != NULL) { |
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1105 _queue_tail->set_next(new_head); |
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1106 } else { // _queue_head == NULL |
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1107 _queue_head = new_head; |
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1108 } |
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1109 _queue_tail = new_tail; |
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1110 } |
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1111 } |
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1112 } |
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1113 |
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1114 #endif // ndef KERNEL |