1 /* 2 * Copyright (c) 1998, 2017, Oracle and/or its affiliates. All rights reserved. 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 /* 26 * eventHandler 27 * 28 * This module handles events as they come in directly from JVMTI 29 * and also maps them to JDI events. JDI events are those requested 30 * at the JDI or JDWP level and seen on those levels. Mapping is 31 * one-to-many, a JVMTI event may map to several JDI events, or 32 * to none. Part of that mapping process is filteration, which 33 * eventFilter sub-module handles. A JDI EventRequest corresponds 34 * to a HandlerNode and a JDI filter to the hidden HandlerNode data 35 * used by eventFilter. For example, if at the JDI level the user 36 * executed: 37 * 38 * EventRequestManager erm = vm.eventRequestManager(); 39 * BreakpointRequest bp = erm.createBreakpointRequest(); 40 * bp.enable(); 41 * ClassPrepareRequest req = erm.createClassPrepareRequest(); 42 * req.enable(); 43 * req = erm.createClassPrepareRequest(); 44 * req.addClassFilter("Foo*"); 45 * req.enable(); 46 * 47 * Three handlers would be created, the first with a LocationOnly 48 * filter and the last with a ClassMatch filter. 49 * When a JVMTI class prepare event for "Foobar" 50 * comes in, the second handler will create one JDI event, the 51 * third handler will compare the class signature, and since 52 * it matchs create a second event. There may also be internal 53 * events as there are in this case, one created by the front-end 54 * and one by the back-end. 55 * 56 * Each event kind has a handler chain, which is a doublely linked 57 * list of handlers for that kind of event. 58 */ 59 #include "util.h" 60 #include "eventHandler.h" 61 #include "eventHandlerRestricted.h" 62 #include "eventFilter.h" 63 #include "eventFilterRestricted.h" 64 #include "standardHandlers.h" 65 #include "threadControl.h" 66 #include "eventHelper.h" 67 #include "classTrack.h" 68 #include "commonRef.h" 69 #include "debugLoop.h" 70 71 static HandlerID requestIdCounter; 72 static jbyte currentSessionID; 73 74 /* Counter of active callbacks and flag for vm_death */ 75 static int active_callbacks = 0; 76 static jboolean vm_death_callback_active = JNI_FALSE; 77 static jrawMonitorID callbackLock; 78 static jrawMonitorID callbackBlock; 79 80 /* Macros to surround callback code (non-VM_DEATH callbacks). 81 * Note that this just keeps a count of the non-VM_DEATH callbacks that 82 * are currently active, it does not prevent these callbacks from 83 * operating in parallel. It's the VM_DEATH callback that will wait 84 * for all these callbacks to finish up, so that it can report the 85 * VM_DEATH in a clean state. 86 * If the VM_DEATH callback is active in the BEGIN macro then this 87 * callback just blocks until released by the VM_DEATH callback. 88 * If the VM_DEATH callback is active in the END macro, then this 89 * callback will notify the VM_DEATH callback if it's the last one, 90 * and then block until released by the VM_DEATH callback. 91 * Why block? These threads are often the threads of the Java program, 92 * not blocking might mean that a return would continue execution of 93 * some java thread in the middle of VM_DEATH, this seems troubled. 94 * 95 * WARNING: No not 'return' or 'goto' out of the BEGIN_CALLBACK/END_CALLBACK 96 * block, this will mess up the count. 97 */ 98 99 #define BEGIN_CALLBACK() \ 100 { /* BEGIN OF CALLBACK */ \ 101 jboolean bypass = JNI_TRUE; \ 102 debugMonitorEnter(callbackLock); { \ 103 if (vm_death_callback_active) { \ 104 /* allow VM_DEATH callback to finish */ \ 105 debugMonitorExit(callbackLock); \ 106 /* Now block because VM is about to die */ \ 107 debugMonitorEnter(callbackBlock); \ 108 debugMonitorExit(callbackBlock); \ 109 } else { \ 110 active_callbacks++; \ 111 bypass = JNI_FALSE; \ 112 debugMonitorExit(callbackLock); \ 113 } \ 114 } \ 115 if ( !bypass ) { \ 116 /* BODY OF CALLBACK CODE */ 117 118 #define END_CALLBACK() /* Part of bypass if body */ \ 119 debugMonitorEnter(callbackLock); { \ 120 active_callbacks--; \ 121 if (active_callbacks < 0) { \ 122 EXIT_ERROR(0, "Problems tracking active callbacks"); \ 123 } \ 124 if (vm_death_callback_active) { \ 125 if (active_callbacks == 0) { \ 126 debugMonitorNotifyAll(callbackLock); \ 127 } \ 128 /* allow VM_DEATH callback to finish */ \ 129 debugMonitorExit(callbackLock); \ 130 /* Now block because VM is about to die */ \ 131 debugMonitorEnter(callbackBlock); \ 132 debugMonitorExit(callbackBlock); \ 133 } else { \ 134 debugMonitorExit(callbackLock); \ 135 } \ 136 } \ 137 } \ 138 } /* END OF CALLBACK */ 139 140 /* 141 * We are starting with a very simple locking scheme 142 * for event handling. All readers and writers of data in 143 * the handlers[] chain must own this lock for the duration 144 * of its use. If contention becomes a problem, we can: 145 * 146 * 1) create a lock per event type. 147 * 2) move to a readers/writers approach where multiple threads 148 * can access the chains simultaneously while reading (the 149 * normal activity of an event callback). 150 */ 151 static jrawMonitorID handlerLock; 152 153 typedef struct HandlerChain_ { 154 HandlerNode *first; 155 /* add lock here */ 156 } HandlerChain; 157 158 /* 159 * This array maps event kinds to handler chains. 160 * Protected by handlerLock. 161 */ 162 163 static HandlerChain __handlers[EI_max-EI_min+1]; 164 165 /* Given a HandlerNode, these access our private data. 166 */ 167 #define PRIVATE_DATA(node) \ 168 (&(((EventHandlerRestricted_HandlerNode*)(void*)(node))->private_ehpd)) 169 170 #define NEXT(node) (PRIVATE_DATA(node)->private_next) 171 #define PREV(node) (PRIVATE_DATA(node)->private_prev) 172 #define CHAIN(node) (PRIVATE_DATA(node)->private_chain) 173 #define HANDLER_FUNCTION(node) (PRIVATE_DATA(node)->private_handlerFunction) 174 175 static jclass getObjectClass(jobject object); 176 static jvmtiError freeHandler(HandlerNode *node); 177 178 static jvmtiError freeHandlerChain(HandlerChain *chain); 179 180 static HandlerChain * 181 getHandlerChain(EventIndex i) 182 { 183 if ( i < EI_min || i > EI_max ) { 184 EXIT_ERROR(AGENT_ERROR_INVALID_EVENT_TYPE,"bad index for handler"); 185 } 186 return &(__handlers[i-EI_min]); 187 } 188 189 static void 190 insert(HandlerChain *chain, HandlerNode *node) 191 { 192 HandlerNode *oldHead = chain->first; 193 NEXT(node) = oldHead; 194 PREV(node) = NULL; 195 CHAIN(node) = chain; 196 if (oldHead != NULL) { 197 PREV(oldHead) = node; 198 } 199 chain->first = node; 200 } 201 202 static HandlerNode * 203 findInChain(HandlerChain *chain, HandlerID handlerID) 204 { 205 HandlerNode *node = chain->first; 206 while (node != NULL) { 207 if (node->handlerID == handlerID) { 208 return node; 209 } 210 node = NEXT(node); 211 } 212 return NULL; 213 } 214 215 static HandlerNode * 216 find(EventIndex ei, HandlerID handlerID) 217 { 218 return findInChain(getHandlerChain(ei), handlerID); 219 } 220 221 /** 222 * Deinsert. Safe for non-inserted nodes. 223 */ 224 static void 225 deinsert(HandlerNode *node) 226 { 227 HandlerChain *chain = CHAIN(node); 228 229 if (chain == NULL) { 230 return; 231 } 232 if (chain->first == node) { 233 chain->first = NEXT(node); 234 } 235 if (NEXT(node) != NULL) { 236 PREV(NEXT(node)) = PREV(node); 237 } 238 if (PREV(node) != NULL) { 239 NEXT(PREV(node)) = NEXT(node); 240 } 241 CHAIN(node) = NULL; 242 } 243 244 jboolean 245 eventHandlerRestricted_iterator(EventIndex ei, 246 IteratorFunction func, void *arg) 247 { 248 HandlerChain *chain; 249 HandlerNode *node; 250 JNIEnv *env; 251 252 chain = getHandlerChain(ei); 253 node = chain->first; 254 env = getEnv(); 255 256 if ( func == NULL ) { 257 EXIT_ERROR(AGENT_ERROR_INTERNAL,"iterator function NULL"); 258 } 259 260 while (node != NULL) { 261 if (((func)(env, node, arg))) { 262 return JNI_TRUE; 263 } 264 node = NEXT(node); 265 } 266 return JNI_FALSE; 267 } 268 269 /* BREAKPOINT, METHOD_ENTRY and SINGLE_STEP events are covered by 270 * the co-location of events policy. Of these three co-located 271 * events, METHOD_ENTRY is always reported first and BREAKPOINT 272 * is always reported last. Here are the possible combinations and 273 * their order: 274 * 275 * (p1) METHOD_ENTRY, BREAKPOINT (existing) 276 * (p2) METHOD_ENTRY, BREAKPOINT (new) 277 * (p1) METHOD_ENTRY, SINGLE_STEP 278 * (p1) METHOD_ENTRY, SINGLE_STEP, BREAKPOINT (existing) 279 * (p1/p2) METHOD_ENTRY, SINGLE_STEP, BREAKPOINT (new) 280 * (p1) SINGLE_STEP, BREAKPOINT (existing) 281 * (p2) SINGLE_STEP, BREAKPOINT (new) 282 * 283 * BREAKPOINT (existing) indicates a BREAKPOINT that is set before 284 * the other co-located event is posted. BREAKPOINT (new) indicates 285 * a BREAKPOINT that is set after the other co-located event is 286 * posted and before the thread has resumed execution. 287 * 288 * Co-location of events policy used to be implemented via 289 * temporary BREAKPOINTs along with deferring the reporting of 290 * non-BREAKPOINT co-located events, but the temporary BREAKPOINTs 291 * caused performance problems on VMs where setting or clearing 292 * BREAKPOINTs is expensive, e.g., HotSpot. 293 * 294 * The policy is now implemented in two phases. Phase 1: when a 295 * METHOD_ENTRY or SINGLE_STEP event is received, if there is an 296 * existing co-located BREAKPOINT, then the current event is 297 * deferred. When the BREAKPOINT event is processed, the event 298 * bag will contain the deferred METHOD_ENTRY and/or SINGLE_STEP 299 * events along with the BREAKPOINT event. For a METHOD_ENTRY 300 * event where there is not an existing co-located BREAKPOINT, 301 * if SINGLE_STEP events are also enabled for the thread, then 302 * the METHOD_ENTRY event is deferred. When the SINGLE_STEP event 303 * is processed, the event bag will also contain the deferred 304 * METHOD_ENTRY event. This covers each of the combinations 305 * marked with 'p1' above. 306 * 307 * Phase 2: if there is no existing co-located BREAKPOINT, then the 308 * location information for the METHOD_ENTRY or SINGLE_STEP event 309 * is recorded in the ThreadNode. If the next event for the thread 310 * is a co-located BREAKPOINT, then the first BREAKPOINT event will 311 * be skipped since it cannot be delivered in the same event set. 312 * This covers each of the combinations marked with 'p2' above. 313 * 314 * For the combination marked p1/p2, part of the case is handled 315 * during phase 1 and the rest is handled during phase 2. 316 * 317 * The recording of information in the ThreadNode is handled in 318 * this routine. The special handling of the next event for the 319 * thread is handled in skipEventReport(). 320 */ 321 322 static jboolean 323 deferEventReport(JNIEnv *env, jthread thread, 324 EventIndex ei, jclass clazz, jmethodID method, jlocation location) 325 { 326 jboolean deferring = JNI_FALSE; 327 328 switch (ei) { 329 case EI_METHOD_ENTRY: 330 if (!isMethodNative(method)) { 331 jvmtiError error; 332 jlocation start; 333 jlocation end; 334 error = methodLocation(method, &start, &end); 335 if (error == JVMTI_ERROR_NONE) { 336 deferring = isBreakpointSet(clazz, method, start) || 337 threadControl_getInstructionStepMode(thread) 338 == JVMTI_ENABLE; 339 if (!deferring) { 340 threadControl_saveCLEInfo(env, thread, ei, 341 clazz, method, start); 342 } 343 } 344 } 345 break; 346 case EI_SINGLE_STEP: 347 deferring = isBreakpointSet(clazz, method, location); 348 if (!deferring) { 349 threadControl_saveCLEInfo(env, thread, ei, 350 clazz, method, location); 351 } 352 break; 353 default: 354 break; 355 } 356 /* TO DO: Once JVMTI supports a way to know if we're 357 * at the end of a method, we should check here for 358 * break and step events which precede a method exit 359 * event. 360 */ 361 return deferring; 362 } 363 364 /* Handle phase 2 of the co-located events policy. See detailed 365 * comments in deferEventReport() above. 366 */ 367 static jboolean 368 skipEventReport(JNIEnv *env, jthread thread, EventIndex ei, 369 jclass clazz, jmethodID method, jlocation location) 370 { 371 jboolean skipping = JNI_FALSE; 372 373 if (ei == EI_BREAKPOINT) { 374 if (threadControl_cmpCLEInfo(env, thread, clazz, method, location)) { 375 LOG_MISC(("Co-located breakpoint event found: " 376 "%s,thread=%p,clazz=%p,method=%p,location=%d", 377 eventText(ei), thread, clazz, method, location)); 378 skipping = JNI_TRUE; 379 } 380 } 381 382 threadControl_clearCLEInfo(env, thread); 383 384 return skipping; 385 } 386 387 static void 388 reportEvents(JNIEnv *env, jbyte sessionID, jthread thread, EventIndex ei, 389 jclass clazz, jmethodID method, jlocation location, 390 struct bag *eventBag) 391 { 392 jbyte suspendPolicy; 393 jboolean invoking; 394 395 if (bagSize(eventBag) < 1) { 396 return; 397 } 398 399 /* 400 * Never report events before initialization completes 401 */ 402 if (!debugInit_isInitComplete()) { 403 return; 404 } 405 406 /* 407 * Check to see if we should skip reporting this event due to 408 * co-location of events policy. 409 */ 410 if (thread != NULL && 411 skipEventReport(env, thread, ei, clazz, method, location)) { 412 LOG_MISC(("event report being skipped: " 413 "ei=%s,thread=%p,clazz=%p,method=%p,location=%d", 414 eventText(ei), thread, clazz, method, location)); 415 bagDeleteAll(eventBag); 416 return; 417 } 418 419 /* We delay the reporting of some events so that they can be 420 * properly grouped into event sets with upcoming events. If 421 * the reporting is to be deferred, the event commands remain 422 * in the event bag until a subsequent event occurs. Event is 423 * NULL for synthetic events (e.g. unload). 424 */ 425 if (thread == NULL 426 || !deferEventReport(env, thread, ei, 427 clazz, method, location)) { 428 struct bag *completedBag = bagDup(eventBag); 429 bagDeleteAll(eventBag); 430 if (completedBag == NULL) { 431 /* 432 * TO DO: Report, but don't terminate? 433 */ 434 return; 435 } else { 436 suspendPolicy = eventHelper_reportEvents(sessionID, completedBag); 437 if (thread != NULL && suspendPolicy != JDWP_SUSPEND_POLICY(NONE)) { 438 do { 439 /* The events have been reported and this 440 * thread is about to continue, but it may 441 * have been started up just to perform a 442 * requested method invocation. If so, we do 443 * the invoke now and then stop again waiting 444 * for another continue. By then another 445 * invoke request can be in place, so there is 446 * a loop around this code. 447 */ 448 invoking = invoker_doInvoke(thread); 449 if (invoking) { 450 eventHelper_reportInvokeDone(sessionID, thread); 451 } 452 } while (invoking); 453 } 454 bagDestroyBag(completedBag); 455 } 456 } 457 } 458 459 /* A bagEnumerateFunction. Create a synthetic class unload event 460 * for every class no longer present. Analogous to event_callback 461 * combined with a handler in a unload specific (no event 462 * structure) kind of way. 463 */ 464 static jboolean 465 synthesizeUnloadEvent(void *signatureVoid, void *envVoid) 466 { 467 JNIEnv *env = (JNIEnv *)envVoid; 468 char *signature = *(char **)signatureVoid; 469 char *classname; 470 HandlerNode *node; 471 jbyte eventSessionID = currentSessionID; 472 struct bag *eventBag = eventHelper_createEventBag(); 473 474 /* TO DO: Report null error, but don't die */ 475 JDI_ASSERT(eventBag != NULL); 476 477 /* Signature needs to last, so convert extra copy to 478 * classname 479 */ 480 classname = jvmtiAllocate((int)strlen(signature)+1); 481 (void)strcpy(classname, signature); 482 convertSignatureToClassname(classname); 483 484 debugMonitorEnter(handlerLock); 485 486 node = getHandlerChain(EI_GC_FINISH)->first; 487 while (node != NULL) { 488 /* save next so handlers can remove themselves */ 489 HandlerNode *next = NEXT(node); 490 jboolean shouldDelete; 491 492 if (eventFilterRestricted_passesUnloadFilter(env, classname, 493 node, 494 &shouldDelete)) { 495 /* There may be multiple handlers, the signature will 496 * be freed when the event helper thread has written 497 * it. So each event needs a separate allocation. 498 */ 499 char *durableSignature = jvmtiAllocate((int)strlen(signature)+1); 500 (void)strcpy(durableSignature, signature); 501 502 eventHelper_recordClassUnload(node->handlerID, 503 durableSignature, 504 eventBag); 505 } 506 if (shouldDelete) { 507 /* We can safely free the node now that we are done 508 * using it. 509 */ 510 (void)freeHandler(node); 511 } 512 node = next; 513 } 514 515 debugMonitorExit(handlerLock); 516 517 if (eventBag != NULL) { 518 reportEvents(env, eventSessionID, (jthread)NULL, 0, 519 (jclass)NULL, (jmethodID)NULL, 0, eventBag); 520 521 /* 522 * bag was created locally, destroy it here. 523 */ 524 bagDestroyBag(eventBag); 525 } 526 527 jvmtiDeallocate(signature); 528 jvmtiDeallocate(classname); 529 530 return JNI_TRUE; 531 } 532 533 /* Garbage Collection Happened */ 534 static unsigned int garbageCollected = 0; 535 536 /* The JVMTI generic event callback. Each event is passed to a sequence of 537 * handlers in a chain until the chain ends or one handler 538 * consumes the event. 539 */ 540 static void 541 event_callback(JNIEnv *env, EventInfo *evinfo) 542 { 543 struct bag *eventBag; 544 jbyte eventSessionID = currentSessionID; /* session could change */ 545 jthrowable currentException; 546 jthread thread; 547 548 LOG_MISC(("event_callback(): ei=%s", eventText(evinfo->ei))); 549 log_debugee_location("event_callback()", evinfo->thread, evinfo->method, evinfo->location); 550 551 /* We want to preserve any current exception that might get 552 * wiped out during event handling (e.g. JNI calls). We have 553 * to rely on space for the local reference on the current 554 * frame because doing a PushLocalFrame here might itself 555 * generate an exception. 556 */ 557 currentException = JNI_FUNC_PTR(env,ExceptionOccurred)(env); 558 JNI_FUNC_PTR(env,ExceptionClear)(env); 559 560 /* See if a garbage collection finish event happened earlier. 561 * 562 * Note: The "if" is an optimization to avoid entering the lock on every 563 * event; garbageCollected may be zapped before we enter 564 * the lock but then this just becomes one big no-op. 565 */ 566 if ( garbageCollected > 0 ) { 567 struct bag *unloadedSignatures = NULL; 568 569 /* We want to compact the hash table of all 570 * objects sent to the front end by removing objects that have 571 * been collected. 572 */ 573 commonRef_compact(); 574 575 /* We also need to simulate the class unload events. */ 576 577 debugMonitorEnter(handlerLock); 578 579 /* Clear garbage collection counter */ 580 garbageCollected = 0; 581 582 /* Analyze which class unloads occurred */ 583 unloadedSignatures = classTrack_processUnloads(env); 584 585 debugMonitorExit(handlerLock); 586 587 /* Generate the synthetic class unload events and/or just cleanup. */ 588 if ( unloadedSignatures != NULL ) { 589 (void)bagEnumerateOver(unloadedSignatures, synthesizeUnloadEvent, 590 (void *)env); 591 bagDestroyBag(unloadedSignatures); 592 } 593 } 594 595 thread = evinfo->thread; 596 if (thread != NULL) { 597 /* 598 * Record the fact that we're entering an event 599 * handler so that thread operations (status, interrupt, 600 * stop) can be done correctly and so that thread 601 * resources can be allocated. This must be done before 602 * grabbing any locks. 603 */ 604 eventBag = threadControl_onEventHandlerEntry(eventSessionID, 605 evinfo->ei, thread, currentException); 606 if ( eventBag == NULL ) { 607 jboolean invoking; 608 do { 609 /* The event has been 'handled' and this 610 * thread is about to continue, but it may 611 * have been started up just to perform a 612 * requested method invocation. If so, we do 613 * the invoke now and then stop again waiting 614 * for another continue. By then another 615 * invoke request can be in place, so there is 616 * a loop around this code. 617 */ 618 invoking = invoker_doInvoke(thread); 619 if (invoking) { 620 eventHelper_reportInvokeDone(eventSessionID, thread); 621 } 622 } while (invoking); 623 return; /* Do nothing, event was consumed */ 624 } 625 } else { 626 eventBag = eventHelper_createEventBag(); 627 if (eventBag == NULL) { 628 /* 629 * TO DO: Report, but don't die 630 */ 631 eventBag = NULL; /* to shut up lint */ 632 } 633 } 634 635 debugMonitorEnter(handlerLock); 636 { 637 HandlerNode *node; 638 char *classname; 639 640 /* We must keep track of all classes prepared to know what's unloaded */ 641 if (evinfo->ei == EI_CLASS_PREPARE) { 642 classTrack_addPreparedClass(env, evinfo->clazz); 643 } 644 645 node = getHandlerChain(evinfo->ei)->first; 646 classname = getClassname(evinfo->clazz); 647 648 while (node != NULL) { 649 /* save next so handlers can remove themselves */ 650 HandlerNode *next = NEXT(node); 651 jboolean shouldDelete; 652 653 if (eventFilterRestricted_passesFilter(env, classname, 654 evinfo, node, 655 &shouldDelete)) { 656 HandlerFunction func; 657 658 func = HANDLER_FUNCTION(node); 659 if ( func == NULL ) { 660 EXIT_ERROR(AGENT_ERROR_INTERNAL,"handler function NULL"); 661 } 662 (*func)(env, evinfo, node, eventBag); 663 } 664 if (shouldDelete) { 665 /* We can safely free the node now that we are done 666 * using it. 667 */ 668 (void)freeHandler(node); 669 } 670 node = next; 671 } 672 jvmtiDeallocate(classname); 673 } 674 debugMonitorExit(handlerLock); 675 676 if (eventBag != NULL) { 677 reportEvents(env, eventSessionID, thread, evinfo->ei, 678 evinfo->clazz, evinfo->method, evinfo->location, eventBag); 679 } 680 681 /* we are continuing after VMDeathEvent - now we are dead */ 682 if (evinfo->ei == EI_VM_DEATH) { 683 gdata->vmDead = JNI_TRUE; 684 } 685 686 /* 687 * If the bag was created locally, destroy it here. 688 */ 689 if (thread == NULL) { 690 bagDestroyBag(eventBag); 691 } 692 693 /* Always restore any exception that was set beforehand. If 694 * there is a pending async exception, StopThread will be 695 * called from threadControl_onEventHandlerExit immediately 696 * below. Depending on VM implementation and state, the async 697 * exception might immediately overwrite the currentException, 698 * or it might be delayed until later. */ 699 if (currentException != NULL) { 700 JNI_FUNC_PTR(env,Throw)(env, currentException); 701 } else { 702 JNI_FUNC_PTR(env,ExceptionClear)(env); 703 } 704 705 /* 706 * Release thread resources and perform any delayed operations. 707 */ 708 if (thread != NULL) { 709 threadControl_onEventHandlerExit(evinfo->ei, thread, eventBag); 710 } 711 } 712 713 /* Returns a local ref to the declaring class for an object. */ 714 static jclass 715 getObjectClass(jobject object) 716 { 717 jclass clazz; 718 JNIEnv *env = getEnv(); 719 720 clazz = JNI_FUNC_PTR(env,GetObjectClass)(env, object); 721 722 return clazz; 723 } 724 725 /* Returns a local ref to the declaring class for a method, or NULL. */ 726 jclass 727 getMethodClass(jvmtiEnv *jvmti_env, jmethodID method) 728 { 729 jclass clazz = NULL; 730 jvmtiError error; 731 732 if ( method == NULL ) { 733 return NULL; 734 } 735 error = methodClass(method, &clazz); 736 if ( error != JVMTI_ERROR_NONE ) { 737 EXIT_ERROR(error,"Can't get jclass for a methodID, invalid?"); 738 return NULL; 739 } 740 return clazz; 741 } 742 743 /* Event callback for JVMTI_EVENT_SINGLE_STEP */ 744 static void JNICALL 745 cbSingleStep(jvmtiEnv *jvmti_env, JNIEnv *env, 746 jthread thread, jmethodID method, jlocation location) 747 { 748 EventInfo info; 749 750 LOG_CB(("cbSingleStep: thread=%p", thread)); 751 752 BEGIN_CALLBACK() { 753 (void)memset(&info,0,sizeof(info)); 754 info.ei = EI_SINGLE_STEP; 755 info.thread = thread; 756 info.clazz = getMethodClass(jvmti_env, method); 757 info.method = method; 758 info.location = location; 759 event_callback(env, &info); 760 } END_CALLBACK(); 761 762 LOG_MISC(("END cbSingleStep")); 763 } 764 765 /* Event callback for JVMTI_EVENT_BREAKPOINT */ 766 static void JNICALL 767 cbBreakpoint(jvmtiEnv *jvmti_env, JNIEnv *env, 768 jthread thread, jmethodID method, jlocation location) 769 { 770 EventInfo info; 771 772 LOG_CB(("cbBreakpoint: thread=%p", thread)); 773 774 BEGIN_CALLBACK() { 775 (void)memset(&info,0,sizeof(info)); 776 info.ei = EI_BREAKPOINT; 777 info.thread = thread; 778 info.clazz = getMethodClass(jvmti_env, method); 779 info.method = method; 780 info.location = location; 781 event_callback(env, &info); 782 } END_CALLBACK(); 783 784 LOG_MISC(("END cbBreakpoint")); 785 } 786 787 /* Event callback for JVMTI_EVENT_FRAME_POP */ 788 static void JNICALL 789 cbFramePop(jvmtiEnv *jvmti_env, JNIEnv *env, 790 jthread thread, jmethodID method, 791 jboolean wasPoppedByException) 792 { 793 EventInfo info; 794 795 /* JDWP does not return these events when popped due to an exception. */ 796 if ( wasPoppedByException ) { 797 return; 798 } 799 800 LOG_CB(("cbFramePop: thread=%p", thread)); 801 802 BEGIN_CALLBACK() { 803 (void)memset(&info,0,sizeof(info)); 804 info.ei = EI_FRAME_POP; 805 info.thread = thread; 806 info.clazz = getMethodClass(jvmti_env, method); 807 info.method = method; 808 event_callback(env, &info); 809 } END_CALLBACK(); 810 811 LOG_MISC(("END cbFramePop")); 812 } 813 814 /* Event callback for JVMTI_EVENT_EXCEPTION */ 815 static void JNICALL 816 cbException(jvmtiEnv *jvmti_env, JNIEnv *env, 817 jthread thread, jmethodID method, 818 jlocation location, jobject exception, 819 jmethodID catch_method, jlocation catch_location) 820 { 821 EventInfo info; 822 823 LOG_CB(("cbException: thread=%p", thread)); 824 825 BEGIN_CALLBACK() { 826 (void)memset(&info,0,sizeof(info)); 827 info.ei = EI_EXCEPTION; 828 info.thread = thread; 829 info.clazz = getMethodClass(jvmti_env, method); 830 info.method = method; 831 info.location = location; 832 info.object = exception; 833 info.u.exception.catch_clazz = getMethodClass(jvmti_env, catch_method); 834 info.u.exception.catch_method = catch_method; 835 info.u.exception.catch_location = catch_location; 836 event_callback(env, &info); 837 } END_CALLBACK(); 838 839 LOG_MISC(("END cbException")); 840 } 841 842 /* Event callback for JVMTI_EVENT_THREAD_START */ 843 static void JNICALL 844 cbThreadStart(jvmtiEnv *jvmti_env, JNIEnv *env, jthread thread) 845 { 846 EventInfo info; 847 848 LOG_CB(("cbThreadStart: thread=%p", thread)); 849 850 BEGIN_CALLBACK() { 851 (void)memset(&info,0,sizeof(info)); 852 info.ei = EI_THREAD_START; 853 info.thread = thread; 854 event_callback(env, &info); 855 } END_CALLBACK(); 856 857 LOG_MISC(("END cbThreadStart")); 858 } 859 860 /* Event callback for JVMTI_EVENT_THREAD_END */ 861 static void JNICALL 862 cbThreadEnd(jvmtiEnv *jvmti_env, JNIEnv *env, jthread thread) 863 { 864 EventInfo info; 865 866 LOG_CB(("cbThreadEnd: thread=%p", thread)); 867 868 BEGIN_CALLBACK() { 869 (void)memset(&info,0,sizeof(info)); 870 info.ei = EI_THREAD_END; 871 info.thread = thread; 872 event_callback(env, &info); 873 } END_CALLBACK(); 874 875 LOG_MISC(("END cbThreadEnd")); 876 } 877 878 /* Event callback for JVMTI_EVENT_CLASS_PREPARE */ 879 static void JNICALL 880 cbClassPrepare(jvmtiEnv *jvmti_env, JNIEnv *env, 881 jthread thread, jclass klass) 882 { 883 EventInfo info; 884 885 LOG_CB(("cbClassPrepare: thread=%p", thread)); 886 887 BEGIN_CALLBACK() { 888 (void)memset(&info,0,sizeof(info)); 889 info.ei = EI_CLASS_PREPARE; 890 info.thread = thread; 891 info.clazz = klass; 892 event_callback(env, &info); 893 } END_CALLBACK(); 894 895 LOG_MISC(("END cbClassPrepare")); 896 } 897 898 /* Event callback for JVMTI_EVENT_GARBAGE_COLLECTION_FINISH */ 899 static void JNICALL 900 cbGarbageCollectionFinish(jvmtiEnv *jvmti_env) 901 { 902 LOG_CB(("cbGarbageCollectionFinish")); 903 ++garbageCollected; 904 LOG_MISC(("END cbGarbageCollectionFinish")); 905 } 906 907 /* Event callback for JVMTI_EVENT_CLASS_LOAD */ 908 static void JNICALL 909 cbClassLoad(jvmtiEnv *jvmti_env, JNIEnv *env, 910 jthread thread, jclass klass) 911 { 912 EventInfo info; 913 914 LOG_CB(("cbClassLoad: thread=%p", thread)); 915 916 BEGIN_CALLBACK() { 917 (void)memset(&info,0,sizeof(info)); 918 info.ei = EI_CLASS_LOAD; 919 info.thread = thread; 920 info.clazz = klass; 921 event_callback(env, &info); 922 } END_CALLBACK(); 923 924 LOG_MISC(("END cbClassLoad")); 925 } 926 927 /* Event callback for JVMTI_EVENT_FIELD_ACCESS */ 928 static void JNICALL 929 cbFieldAccess(jvmtiEnv *jvmti_env, JNIEnv *env, 930 jthread thread, jmethodID method, 931 jlocation location, jclass field_klass, 932 jobject object, jfieldID field) 933 { 934 EventInfo info; 935 936 LOG_CB(("cbFieldAccess: thread=%p", thread)); 937 938 BEGIN_CALLBACK() { 939 (void)memset(&info,0,sizeof(info)); 940 info.ei = EI_FIELD_ACCESS; 941 info.thread = thread; 942 info.clazz = getMethodClass(jvmti_env, method); 943 info.method = method; 944 info.location = location; 945 info.u.field_access.field_clazz = field_klass; 946 info.object = object; 947 info.u.field_access.field = field; 948 event_callback(env, &info); 949 } END_CALLBACK(); 950 951 LOG_MISC(("END cbFieldAccess")); 952 } 953 954 /* Event callback for JVMTI_EVENT_FIELD_MODIFICATION */ 955 static void JNICALL 956 cbFieldModification(jvmtiEnv *jvmti_env, JNIEnv *env, 957 jthread thread, jmethodID method, 958 jlocation location, jclass field_klass, jobject object, jfieldID field, 959 char signature_type, jvalue new_value) 960 { 961 EventInfo info; 962 963 LOG_CB(("cbFieldModification: thread=%p", thread)); 964 965 BEGIN_CALLBACK() { 966 (void)memset(&info,0,sizeof(info)); 967 info.ei = EI_FIELD_MODIFICATION; 968 info.thread = thread; 969 info.clazz = getMethodClass(jvmti_env, method); 970 info.method = method; 971 info.location = location; 972 info.u.field_modification.field = field; 973 info.u.field_modification.field_clazz = field_klass; 974 info.object = object; 975 info.u.field_modification.signature_type= signature_type; 976 info.u.field_modification.new_value = new_value; 977 event_callback(env, &info); 978 } END_CALLBACK(); 979 980 LOG_MISC(("END cbFieldModification")); 981 } 982 983 /* Event callback for JVMTI_EVENT_EXCEPTION_CATCH */ 984 static void JNICALL 985 cbExceptionCatch(jvmtiEnv *jvmti_env, JNIEnv *env, jthread thread, 986 jmethodID method, jlocation location, jobject exception) 987 { 988 EventInfo info; 989 990 LOG_CB(("cbExceptionCatch: thread=%p", thread)); 991 992 BEGIN_CALLBACK() { 993 (void)memset(&info,0,sizeof(info)); 994 info.ei = EI_EXCEPTION_CATCH; 995 info.thread = thread; 996 info.clazz = getMethodClass(jvmti_env, method); 997 info.method = method; 998 info.location = location; 999 info.object = exception; 1000 event_callback(env, &info); 1001 } END_CALLBACK(); 1002 1003 LOG_MISC(("END cbExceptionCatch")); 1004 } 1005 1006 /* Event callback for JVMTI_EVENT_METHOD_ENTRY */ 1007 static void JNICALL 1008 cbMethodEntry(jvmtiEnv *jvmti_env, JNIEnv *env, 1009 jthread thread, jmethodID method) 1010 { 1011 EventInfo info; 1012 1013 LOG_CB(("cbMethodEntry: thread=%p", thread)); 1014 1015 BEGIN_CALLBACK() { 1016 (void)memset(&info,0,sizeof(info)); 1017 info.ei = EI_METHOD_ENTRY; 1018 info.thread = thread; 1019 info.clazz = getMethodClass(jvmti_env, method); 1020 info.method = method; 1021 event_callback(env, &info); 1022 } END_CALLBACK(); 1023 1024 LOG_MISC(("END cbMethodEntry")); 1025 } 1026 1027 /* Event callback for JVMTI_EVENT_METHOD_EXIT */ 1028 static void JNICALL 1029 cbMethodExit(jvmtiEnv *jvmti_env, JNIEnv *env, 1030 jthread thread, jmethodID method, 1031 jboolean wasPoppedByException, jvalue return_value) 1032 { 1033 EventInfo info; 1034 1035 /* JDWP does not return these events when popped due to an exception. */ 1036 if ( wasPoppedByException ) { 1037 return; 1038 } 1039 1040 LOG_CB(("cbMethodExit: thread=%p", thread)); 1041 1042 BEGIN_CALLBACK() { 1043 (void)memset(&info,0,sizeof(info)); 1044 info.ei = EI_METHOD_EXIT; 1045 info.thread = thread; 1046 info.clazz = getMethodClass(jvmti_env, method); 1047 info.method = method; 1048 info.u.method_exit.return_value = return_value; 1049 event_callback(env, &info); 1050 } END_CALLBACK(); 1051 1052 LOG_MISC(("END cbMethodExit")); 1053 } 1054 1055 /* Event callback for JVMTI_EVENT_MONITOR_CONTENDED_ENTER */ 1056 static void JNICALL 1057 cbMonitorContendedEnter(jvmtiEnv *jvmti_env, JNIEnv *env, 1058 jthread thread, jobject object) 1059 { 1060 EventInfo info; 1061 jvmtiError error; 1062 jmethodID method; 1063 jlocation location; 1064 1065 LOG_CB(("cbMonitorContendedEnter: thread=%p", thread)); 1066 1067 BEGIN_CALLBACK() { 1068 (void)memset(&info,0,sizeof(info)); 1069 info.ei = EI_MONITOR_CONTENDED_ENTER; 1070 info.thread = thread; 1071 info.object = object; 1072 /* get current location of contended monitor enter */ 1073 error = JVMTI_FUNC_PTR(gdata->jvmti,GetFrameLocation) 1074 (gdata->jvmti, thread, 0, &method, &location); 1075 if (error == JVMTI_ERROR_NONE) { 1076 info.location = location; 1077 info.method = method; 1078 info.clazz = getMethodClass(jvmti_env, method); 1079 } else { 1080 info.location = -1; 1081 } 1082 event_callback(env, &info); 1083 } END_CALLBACK(); 1084 1085 LOG_MISC(("END cbMonitorContendedEnter")); 1086 } 1087 1088 /* Event callback for JVMTI_EVENT_MONITOR_CONTENDED_ENTERED */ 1089 static void JNICALL 1090 cbMonitorContendedEntered(jvmtiEnv *jvmti_env, JNIEnv *env, 1091 jthread thread, jobject object) 1092 { 1093 EventInfo info; 1094 jvmtiError error; 1095 jmethodID method; 1096 jlocation location; 1097 1098 LOG_CB(("cbMonitorContendedEntered: thread=%p", thread)); 1099 1100 BEGIN_CALLBACK() { 1101 (void)memset(&info,0,sizeof(info)); 1102 info.ei = EI_MONITOR_CONTENDED_ENTERED; 1103 info.thread = thread; 1104 info.object = object; 1105 /* get current location of contended monitor enter */ 1106 error = JVMTI_FUNC_PTR(gdata->jvmti,GetFrameLocation) 1107 (gdata->jvmti, thread, 0, &method, &location); 1108 if (error == JVMTI_ERROR_NONE) { 1109 info.location = location; 1110 info.method = method; 1111 info.clazz = getMethodClass(jvmti_env, method); 1112 } else { 1113 info.location = -1; 1114 } 1115 event_callback(env, &info); 1116 } END_CALLBACK(); 1117 1118 LOG_MISC(("END cbMonitorContendedEntered")); 1119 } 1120 1121 /* Event callback for JVMTI_EVENT_MONITOR_WAIT */ 1122 static void JNICALL 1123 cbMonitorWait(jvmtiEnv *jvmti_env, JNIEnv *env, 1124 jthread thread, jobject object, 1125 jlong timeout) 1126 { 1127 EventInfo info; 1128 jvmtiError error; 1129 jmethodID method; 1130 jlocation location; 1131 1132 LOG_CB(("cbMonitorWait: thread=%p", thread)); 1133 1134 BEGIN_CALLBACK() { 1135 (void)memset(&info,0,sizeof(info)); 1136 info.ei = EI_MONITOR_WAIT; 1137 info.thread = thread; 1138 info.object = object; 1139 /* The info.clazz is used for both class filtering and for location info. 1140 * For monitor wait event the class filtering is done for class of monitor 1141 * object. So here info.clazz is set to class of monitor object here and it 1142 * is reset to class of method before writing location info. 1143 * See writeMonitorEvent in eventHelper.c 1144 */ 1145 info.clazz = getObjectClass(object); 1146 info.u.monitor.timeout = timeout; 1147 1148 /* get location of monitor wait() method. */ 1149 error = JVMTI_FUNC_PTR(gdata->jvmti,GetFrameLocation) 1150 (gdata->jvmti, thread, 0, &method, &location); 1151 if (error == JVMTI_ERROR_NONE) { 1152 info.location = location; 1153 info.method = method; 1154 } else { 1155 info.location = -1; 1156 } 1157 event_callback(env, &info); 1158 } END_CALLBACK(); 1159 1160 LOG_MISC(("END cbMonitorWait")); 1161 } 1162 1163 /* Event callback for JVMTI_EVENT_MONITOR_WAIT */ 1164 static void JNICALL 1165 cbMonitorWaited(jvmtiEnv *jvmti_env, JNIEnv *env, 1166 jthread thread, jobject object, 1167 jboolean timed_out) 1168 { 1169 EventInfo info; 1170 jvmtiError error; 1171 jmethodID method; 1172 jlocation location; 1173 1174 LOG_CB(("cbMonitorWaited: thread=%p", thread)); 1175 1176 BEGIN_CALLBACK() { 1177 (void)memset(&info,0,sizeof(info)); 1178 info.ei = EI_MONITOR_WAITED; 1179 info.thread = thread; 1180 info.object = object; 1181 /* The info.clazz is used for both class filtering and for location info. 1182 * For monitor waited event the class filtering is done for class of monitor 1183 * object. So here info.clazz is set to class of monitor object here and it 1184 * is reset to class of method before writing location info. 1185 * See writeMonitorEvent in eventHelper.c 1186 */ 1187 info.clazz = getObjectClass(object); 1188 info.u.monitor.timed_out = timed_out; 1189 1190 /* get location of monitor wait() method */ 1191 error = JVMTI_FUNC_PTR(gdata->jvmti,GetFrameLocation) 1192 (gdata->jvmti, thread, 0, &method, &location); 1193 if (error == JVMTI_ERROR_NONE) { 1194 info.location = location; 1195 info.method = method; 1196 } else { 1197 info.location = -1; 1198 } 1199 event_callback(env, &info); 1200 } END_CALLBACK(); 1201 1202 LOG_MISC(("END cbMonitorWaited")); 1203 } 1204 1205 /* Event callback for JVMTI_EVENT_VM_INIT */ 1206 static void JNICALL 1207 cbVMInit(jvmtiEnv *jvmti_env, JNIEnv *env, jthread thread) 1208 { 1209 EventInfo info; 1210 1211 LOG_CB(("cbVMInit")); 1212 1213 BEGIN_CALLBACK() { 1214 (void)memset(&info,0,sizeof(info)); 1215 info.ei = EI_VM_INIT; 1216 info.thread = thread; 1217 event_callback(env, &info); 1218 } END_CALLBACK(); 1219 1220 LOG_MISC(("END cbVMInit")); 1221 } 1222 1223 /* Event callback for JVMTI_EVENT_VM_DEATH */ 1224 static void JNICALL 1225 cbVMDeath(jvmtiEnv *jvmti_env, JNIEnv *env) 1226 { 1227 jvmtiError error; 1228 EventInfo info; 1229 LOG_CB(("cbVMDeath")); 1230 1231 /* Clear out ALL callbacks at this time, we don't want any more. */ 1232 /* This should prevent any new BEGIN_CALLBACK() calls. */ 1233 (void)memset(&(gdata->callbacks),0,sizeof(gdata->callbacks)); 1234 error = JVMTI_FUNC_PTR(gdata->jvmti,SetEventCallbacks) 1235 (gdata->jvmti, &(gdata->callbacks), sizeof(gdata->callbacks)); 1236 if (error != JVMTI_ERROR_NONE) { 1237 EXIT_ERROR(error,"Can't clear event callbacks on vm death"); 1238 } 1239 1240 /* Now that no new callbacks will be made, we need to wait for the ones 1241 * that are still active to complete. 1242 * The BEGIN_CALLBACK/END_CALLBACK macros implement the VM_DEATH 1243 * callback protocol. Once the callback table is cleared (above), 1244 * we can have callback threads in different stages: 1245 * 1) after callback function entry and before BEGIN_CALLBACK 1246 * macro; we catch these threads with callbackBlock in the 1247 * BEGIN_CALLBACK macro 1248 * 2) after BEGIN_CALLBACK macro and before END_CALLBACK macro; we 1249 * catch these threads with callbackBlock in the END_CALLBACK 1250 * macro 1251 * 3) after END_CALLBACK macro; these threads have made it past 1252 * callbackBlock and callbackLock and don't count as active 1253 * 1254 * Since some of the callback threads could be blocked or suspended 1255 * we will resume all threads suspended by the debugger for a short 1256 * time to flush out all callbacks. Note that the callback threads 1257 * will block from returning to the VM in both macros. Some threads 1258 * not associated with callbacks, but suspended by the debugger may 1259 * continue on, but not for long. 1260 * Once the last callback finishes, it will notify this thread and 1261 * we fall out of the loop below and actually process the VM_DEATH 1262 * event. 1263 */ 1264 debugMonitorEnter(callbackBlock); { 1265 debugMonitorEnter(callbackLock); { 1266 vm_death_callback_active = JNI_TRUE; 1267 (void)threadControl_resumeAll(); 1268 while (active_callbacks > 0) { 1269 /* wait for active CALLBACKs to check in (and block) */ 1270 debugMonitorWait(callbackLock); 1271 } 1272 } debugMonitorExit(callbackLock); 1273 1274 /* Only now should we actually process the VM death event */ 1275 (void)memset(&info,0,sizeof(info)); 1276 info.ei = EI_VM_DEATH; 1277 event_callback(env, &info); 1278 1279 /* Here we unblock all the callbacks and let them return to the 1280 * VM. It's not clear this is necessary, but leaving threads 1281 * blocked doesn't seem like a good idea. They don't have much 1282 * life left anyway. 1283 */ 1284 } debugMonitorExit(callbackBlock); 1285 1286 /* 1287 * The VM will die soon after the completion of this callback - 1288 * we synchronize with both the command loop and the debug loop 1289 * for a more orderly shutdown. 1290 */ 1291 commandLoop_sync(); 1292 debugLoop_sync(); 1293 1294 LOG_MISC(("END cbVMDeath")); 1295 } 1296 1297 /** 1298 * Delete this handler (do not delete permanent handlers): 1299 * Deinsert handler from active list, 1300 * make it inactive, and free it's memory 1301 * Assumes handlerLock held. 1302 */ 1303 static jvmtiError 1304 freeHandler(HandlerNode *node) { 1305 jvmtiError error = JVMTI_ERROR_NONE; 1306 1307 /* deinsert the handler node before disableEvents() to make 1308 * sure the event will be disabled when no other event 1309 * handlers are installed. 1310 */ 1311 if (node != NULL && (!node->permanent)) { 1312 deinsert(node); 1313 error = eventFilterRestricted_deinstall(node); 1314 jvmtiDeallocate(node); 1315 } 1316 1317 return error; 1318 } 1319 1320 /** 1321 * Delete all the handlers on this chain (do not delete permanent handlers). 1322 * Assumes handlerLock held. 1323 */ 1324 static jvmtiError 1325 freeHandlerChain(HandlerChain *chain) 1326 { 1327 HandlerNode *node; 1328 jvmtiError error; 1329 1330 error = JVMTI_ERROR_NONE; 1331 node = chain->first; 1332 while ( node != NULL ) { 1333 HandlerNode *next; 1334 jvmtiError singleError; 1335 1336 next = NEXT(node); 1337 singleError = freeHandler(node); 1338 if ( singleError != JVMTI_ERROR_NONE ) { 1339 error = singleError; 1340 } 1341 node = next; 1342 } 1343 return error; 1344 } 1345 1346 /** 1347 * Deinsert and free all memory. Safe for non-inserted nodes. 1348 */ 1349 jvmtiError 1350 eventHandler_free(HandlerNode *node) 1351 { 1352 jvmtiError error; 1353 1354 debugMonitorEnter(handlerLock); 1355 1356 error = freeHandler(node); 1357 1358 debugMonitorExit(handlerLock); 1359 1360 return error; 1361 } 1362 1363 /** 1364 * Free all handlers of this kind created by the JDWP client, 1365 * that is, doesn't free handlers internally created by back-end. 1366 */ 1367 jvmtiError 1368 eventHandler_freeAll(EventIndex ei) 1369 { 1370 jvmtiError error = JVMTI_ERROR_NONE; 1371 HandlerNode *node; 1372 1373 debugMonitorEnter(handlerLock); 1374 node = getHandlerChain(ei)->first; 1375 while (node != NULL) { 1376 HandlerNode *next = NEXT(node); /* allows node removal */ 1377 if (node->handlerID != 0) { /* don't free internal handlers */ 1378 error = freeHandler(node); 1379 if (error != JVMTI_ERROR_NONE) { 1380 break; 1381 } 1382 } 1383 node = next; 1384 } 1385 debugMonitorExit(handlerLock); 1386 return error; 1387 } 1388 1389 /*** 1390 * Delete all breakpoints on "clazz". 1391 */ 1392 void 1393 eventHandler_freeClassBreakpoints(jclass clazz) 1394 { 1395 HandlerNode *node; 1396 JNIEnv *env = getEnv(); 1397 1398 debugMonitorEnter(handlerLock); 1399 node = getHandlerChain(EI_BREAKPOINT)->first; 1400 while (node != NULL) { 1401 HandlerNode *next = NEXT(node); /* allows node removal */ 1402 if (eventFilterRestricted_isBreakpointInClass(env, clazz, 1403 node)) { 1404 (void)freeHandler(node); 1405 } 1406 node = next; 1407 } 1408 debugMonitorExit(handlerLock); 1409 } 1410 1411 jvmtiError 1412 eventHandler_freeByID(EventIndex ei, HandlerID handlerID) 1413 { 1414 jvmtiError error; 1415 HandlerNode *node; 1416 1417 debugMonitorEnter(handlerLock); 1418 node = find(ei, handlerID); 1419 if (node != NULL) { 1420 error = freeHandler(node); 1421 } else { 1422 /* already freed */ 1423 error = JVMTI_ERROR_NONE; 1424 } 1425 debugMonitorExit(handlerLock); 1426 return error; 1427 } 1428 1429 void 1430 eventHandler_initialize(jbyte sessionID) 1431 { 1432 jvmtiError error; 1433 jint i; 1434 1435 requestIdCounter = 1; 1436 currentSessionID = sessionID; 1437 1438 /* This is for BEGIN_CALLBACK/END_CALLBACK handling, make sure this 1439 * is done while none of these callbacks are active. 1440 */ 1441 active_callbacks = 0; 1442 vm_death_callback_active = JNI_FALSE; 1443 callbackLock = debugMonitorCreate("JDWP Callback Lock"); 1444 callbackBlock = debugMonitorCreate("JDWP Callback Block"); 1445 1446 handlerLock = debugMonitorCreate("JDWP Event Handler Lock"); 1447 1448 for (i = EI_min; i <= EI_max; ++i) { 1449 getHandlerChain(i)->first = NULL; 1450 } 1451 1452 /* 1453 * Permanently enabled some events. 1454 */ 1455 error = threadControl_setEventMode(JVMTI_ENABLE, 1456 EI_VM_INIT, NULL); 1457 if (error != JVMTI_ERROR_NONE) { 1458 EXIT_ERROR(error,"Can't enable vm init events"); 1459 } 1460 error = threadControl_setEventMode(JVMTI_ENABLE, 1461 EI_VM_DEATH, NULL); 1462 if (error != JVMTI_ERROR_NONE) { 1463 EXIT_ERROR(error,"Can't enable vm death events"); 1464 } 1465 error = threadControl_setEventMode(JVMTI_ENABLE, 1466 EI_THREAD_START, NULL); 1467 if (error != JVMTI_ERROR_NONE) { 1468 EXIT_ERROR(error,"Can't enable thread start events"); 1469 } 1470 error = threadControl_setEventMode(JVMTI_ENABLE, 1471 EI_THREAD_END, NULL); 1472 if (error != JVMTI_ERROR_NONE) { 1473 EXIT_ERROR(error,"Can't enable thread end events"); 1474 } 1475 error = threadControl_setEventMode(JVMTI_ENABLE, 1476 EI_CLASS_PREPARE, NULL); 1477 if (error != JVMTI_ERROR_NONE) { 1478 EXIT_ERROR(error,"Can't enable class prepare events"); 1479 } 1480 error = threadControl_setEventMode(JVMTI_ENABLE, 1481 EI_GC_FINISH, NULL); 1482 if (error != JVMTI_ERROR_NONE) { 1483 EXIT_ERROR(error,"Can't enable garbage collection finish events"); 1484 } 1485 1486 (void)memset(&(gdata->callbacks),0,sizeof(gdata->callbacks)); 1487 /* Event callback for JVMTI_EVENT_SINGLE_STEP */ 1488 gdata->callbacks.SingleStep = &cbSingleStep; 1489 /* Event callback for JVMTI_EVENT_BREAKPOINT */ 1490 gdata->callbacks.Breakpoint = &cbBreakpoint; 1491 /* Event callback for JVMTI_EVENT_FRAME_POP */ 1492 gdata->callbacks.FramePop = &cbFramePop; 1493 /* Event callback for JVMTI_EVENT_EXCEPTION */ 1494 gdata->callbacks.Exception = &cbException; 1495 /* Event callback for JVMTI_EVENT_THREAD_START */ 1496 gdata->callbacks.ThreadStart = &cbThreadStart; 1497 /* Event callback for JVMTI_EVENT_THREAD_END */ 1498 gdata->callbacks.ThreadEnd = &cbThreadEnd; 1499 /* Event callback for JVMTI_EVENT_CLASS_PREPARE */ 1500 gdata->callbacks.ClassPrepare = &cbClassPrepare; 1501 /* Event callback for JVMTI_EVENT_CLASS_LOAD */ 1502 gdata->callbacks.ClassLoad = &cbClassLoad; 1503 /* Event callback for JVMTI_EVENT_FIELD_ACCESS */ 1504 gdata->callbacks.FieldAccess = &cbFieldAccess; 1505 /* Event callback for JVMTI_EVENT_FIELD_MODIFICATION */ 1506 gdata->callbacks.FieldModification = &cbFieldModification; 1507 /* Event callback for JVMTI_EVENT_EXCEPTION_CATCH */ 1508 gdata->callbacks.ExceptionCatch = &cbExceptionCatch; 1509 /* Event callback for JVMTI_EVENT_METHOD_ENTRY */ 1510 gdata->callbacks.MethodEntry = &cbMethodEntry; 1511 /* Event callback for JVMTI_EVENT_METHOD_EXIT */ 1512 gdata->callbacks.MethodExit = &cbMethodExit; 1513 /* Event callback for JVMTI_EVENT_MONITOR_CONTENDED_ENTER */ 1514 gdata->callbacks.MonitorContendedEnter = &cbMonitorContendedEnter; 1515 /* Event callback for JVMTI_EVENT_MONITOR_CONTENDED_ENTERED */ 1516 gdata->callbacks.MonitorContendedEntered = &cbMonitorContendedEntered; 1517 /* Event callback for JVMTI_EVENT_MONITOR_WAIT */ 1518 gdata->callbacks.MonitorWait = &cbMonitorWait; 1519 /* Event callback for JVMTI_EVENT_MONITOR_WAITED */ 1520 gdata->callbacks.MonitorWaited = &cbMonitorWaited; 1521 /* Event callback for JVMTI_EVENT_VM_INIT */ 1522 gdata->callbacks.VMInit = &cbVMInit; 1523 /* Event callback for JVMTI_EVENT_VM_DEATH */ 1524 gdata->callbacks.VMDeath = &cbVMDeath; 1525 /* Event callback for JVMTI_EVENT_GARBAGE_COLLECTION_FINISH */ 1526 gdata->callbacks.GarbageCollectionFinish = &cbGarbageCollectionFinish; 1527 1528 error = JVMTI_FUNC_PTR(gdata->jvmti,SetEventCallbacks) 1529 (gdata->jvmti, &(gdata->callbacks), sizeof(gdata->callbacks)); 1530 if (error != JVMTI_ERROR_NONE) { 1531 EXIT_ERROR(error,"Can't set event callbacks"); 1532 } 1533 1534 /* Notify other modules that the event callbacks are in place */ 1535 threadControl_onHook(); 1536 1537 /* Get the event helper thread initialized */ 1538 eventHelper_initialize(sessionID); 1539 } 1540 1541 void 1542 eventHandler_reset(jbyte sessionID) 1543 { 1544 int i; 1545 1546 debugMonitorEnter(handlerLock); 1547 1548 /* We must do this first so that if any invokes complete, 1549 * there will be no attempt to send them to the front 1550 * end. Waiting for threadControl_reset leaves a window where 1551 * the invoke completions can sneak through. 1552 */ 1553 threadControl_detachInvokes(); 1554 1555 /* Reset the event helper thread, purging all queued and 1556 * in-process commands. 1557 */ 1558 eventHelper_reset(sessionID); 1559 1560 /* delete all handlers */ 1561 for (i = EI_min; i <= EI_max; i++) { 1562 (void)freeHandlerChain(getHandlerChain(i)); 1563 } 1564 1565 requestIdCounter = 1; 1566 currentSessionID = sessionID; 1567 1568 debugMonitorExit(handlerLock); 1569 } 1570 1571 void 1572 eventHandler_lock(void) 1573 { 1574 debugMonitorEnter(handlerLock); 1575 } 1576 1577 void 1578 eventHandler_unlock(void) 1579 { 1580 debugMonitorExit(handlerLock); 1581 } 1582 1583 /***** handler creation *****/ 1584 1585 HandlerNode * 1586 eventHandler_alloc(jint filterCount, EventIndex ei, jbyte suspendPolicy) 1587 { 1588 HandlerNode *node = eventFilterRestricted_alloc(filterCount); 1589 1590 if (node != NULL) { 1591 node->ei = ei; 1592 node->suspendPolicy = suspendPolicy; 1593 node->permanent = JNI_FALSE; 1594 } 1595 1596 return node; 1597 } 1598 1599 1600 HandlerID 1601 eventHandler_allocHandlerID(void) 1602 { 1603 jint handlerID; 1604 debugMonitorEnter(handlerLock); 1605 handlerID = ++requestIdCounter; 1606 debugMonitorExit(handlerLock); 1607 return handlerID; 1608 } 1609 1610 1611 static jvmtiError 1612 installHandler(HandlerNode *node, 1613 HandlerFunction func, 1614 jboolean external) 1615 { 1616 jvmtiError error; 1617 1618 if ( func == NULL ) { 1619 return AGENT_ERROR_INVALID_EVENT_TYPE; 1620 } 1621 1622 debugMonitorEnter(handlerLock); 1623 1624 HANDLER_FUNCTION(node) = func; 1625 1626 node->handlerID = external? ++requestIdCounter : 0; 1627 error = eventFilterRestricted_install(node); 1628 if (error == JVMTI_ERROR_NONE) { 1629 insert(getHandlerChain(node->ei), node); 1630 } 1631 1632 debugMonitorExit(handlerLock); 1633 1634 return error; 1635 } 1636 1637 static HandlerNode * 1638 createInternal(EventIndex ei, HandlerFunction func, 1639 jthread thread, jclass clazz, jmethodID method, 1640 jlocation location, jboolean permanent) 1641 { 1642 jint index = 0; 1643 jvmtiError error = JVMTI_ERROR_NONE; 1644 HandlerNode *node; 1645 1646 /* 1647 * Start with necessary allocations 1648 */ 1649 node = eventHandler_alloc( 1650 ((thread == NULL)? 0 : 1) + ((clazz == NULL)? 0 : 1), 1651 ei, JDWP_SUSPEND_POLICY(NONE)); 1652 if (node == NULL) { 1653 return NULL; 1654 } 1655 1656 node->permanent = permanent; 1657 1658 if (thread != NULL) { 1659 error = eventFilter_setThreadOnlyFilter(node, index++, thread); 1660 } 1661 1662 if ((error == JVMTI_ERROR_NONE) && (clazz != NULL)) { 1663 error = eventFilter_setLocationOnlyFilter(node, index++, clazz, 1664 method, location); 1665 } 1666 /* 1667 * Create the new handler node 1668 */ 1669 error = installHandler(node, func, JNI_FALSE); 1670 1671 if (error != JVMTI_ERROR_NONE) { 1672 (void)eventHandler_free(node); 1673 node = NULL; 1674 } 1675 return node; 1676 } 1677 1678 HandlerNode * 1679 eventHandler_createPermanentInternal(EventIndex ei, HandlerFunction func) 1680 { 1681 return createInternal(ei, func, NULL, 1682 NULL, NULL, 0, JNI_TRUE); 1683 } 1684 1685 HandlerNode * 1686 eventHandler_createInternalThreadOnly(EventIndex ei, 1687 HandlerFunction func, 1688 jthread thread) 1689 { 1690 return createInternal(ei, func, thread, 1691 NULL, NULL, 0, JNI_FALSE); 1692 } 1693 1694 HandlerNode * 1695 eventHandler_createInternalBreakpoint(HandlerFunction func, 1696 jthread thread, 1697 jclass clazz, 1698 jmethodID method, 1699 jlocation location) 1700 { 1701 return createInternal(EI_BREAKPOINT, func, thread, 1702 clazz, method, location, JNI_FALSE); 1703 } 1704 1705 jvmtiError 1706 eventHandler_installExternal(HandlerNode *node) 1707 { 1708 return installHandler(node, 1709 standardHandlers_defaultHandler(node->ei), 1710 JNI_TRUE); 1711 }