1 //===-- StopInfo.cpp ---------------------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #include "lldb/lldb-python.h" 11 12 #include "lldb/Target/StopInfo.h" 13 14 // C Includes 15 // C++ Includes 16 #include <string> 17 18 // Other libraries and framework includes 19 // Project includes 20 #include "lldb/Core/Log.h" 21 #include "lldb/Breakpoint/Breakpoint.h" 22 #include "lldb/Breakpoint/BreakpointLocation.h" 23 #include "lldb/Breakpoint/StoppointCallbackContext.h" 24 #include "lldb/Breakpoint/Watchpoint.h" 25 #include "lldb/Core/Debugger.h" 26 #include "lldb/Core/StreamString.h" 27 #include "lldb/Expression/ClangUserExpression.h" 28 #include "lldb/Target/Target.h" 29 #include "lldb/Target/Thread.h" 30 #include "lldb/Target/ThreadPlan.h" 31 #include "lldb/Target/Process.h" 32 #include "lldb/Target/UnixSignals.h" 33 34 using namespace lldb; 35 using namespace lldb_private; 36 37 StopInfo::StopInfo (Thread &thread, uint64_t value) : 38 m_thread_wp (thread.shared_from_this()), 39 m_stop_id (thread.GetProcess()->GetStopID()), 40 m_resume_id (thread.GetProcess()->GetResumeID()), 41 m_value (value), 42 m_override_set(false), 43 m_override_value(true) 44 { 45 } 46 47 bool 48 StopInfo::IsValid () const 49 { 50 ThreadSP thread_sp (m_thread_wp.lock()); 51 if (thread_sp) 52 return thread_sp->GetProcess()->GetStopID() == m_stop_id; 53 return false; 54 } 55 56 void 57 StopInfo::MakeStopInfoValid () 58 { 59 ThreadSP thread_sp (m_thread_wp.lock()); 60 if (thread_sp) 61 { 62 m_stop_id = thread_sp->GetProcess()->GetStopID(); 63 m_resume_id = thread_sp->GetProcess()->GetResumeID(); 64 } 65 } 66 67 bool 68 StopInfo::HasTargetRunSinceMe () 69 { 70 ThreadSP thread_sp (m_thread_wp.lock()); 71 72 if (thread_sp) 73 { 74 lldb::StateType ret_type = thread_sp->GetProcess()->GetPrivateState(); 75 if (ret_type == eStateRunning) 76 { 77 return true; 78 } 79 else if (ret_type == eStateStopped) 80 { 81 // This is a little tricky. We want to count "run and stopped again before you could 82 // ask this question as a "TRUE" answer to HasTargetRunSinceMe. But we don't want to 83 // include any running of the target done for expressions. So we track both resumes, 84 // and resumes caused by expressions, and check if there are any resumes NOT caused 85 // by expressions. 86 87 uint32_t curr_resume_id = thread_sp->GetProcess()->GetResumeID(); 88 uint32_t last_user_expression_id = thread_sp->GetProcess()->GetLastUserExpressionResumeID (); 89 if (curr_resume_id == m_resume_id) 90 { 91 return false; 92 } 93 else if (curr_resume_id > last_user_expression_id) 94 { 95 return true; 96 } 97 } 98 } 99 return false; 100 } 101 102 //---------------------------------------------------------------------- 103 // StopInfoBreakpoint 104 //---------------------------------------------------------------------- 105 106 namespace lldb_private 107 { 108 class StopInfoBreakpoint : public StopInfo 109 { 110 public: 111 112 StopInfoBreakpoint (Thread &thread, break_id_t break_id) : 113 StopInfo (thread, break_id), 114 m_description(), 115 m_should_stop (false), 116 m_should_stop_is_valid (false), 117 m_should_perform_action (true), 118 m_address (LLDB_INVALID_ADDRESS), 119 m_break_id(LLDB_INVALID_BREAK_ID), 120 m_was_one_shot (false) 121 { 122 StoreBPInfo(); 123 } 124 125 StopInfoBreakpoint (Thread &thread, break_id_t break_id, bool should_stop) : 126 StopInfo (thread, break_id), 127 m_description(), 128 m_should_stop (should_stop), 129 m_should_stop_is_valid (true), 130 m_should_perform_action (true), 131 m_address (LLDB_INVALID_ADDRESS), 132 m_break_id(LLDB_INVALID_BREAK_ID), 133 m_was_one_shot (false) 134 { 135 StoreBPInfo(); 136 } 137 138 void 139 StoreBPInfo () 140 { 141 ThreadSP thread_sp (m_thread_wp.lock()); 142 if (thread_sp) 143 { 144 BreakpointSiteSP bp_site_sp (thread_sp->GetProcess()->GetBreakpointSiteList().FindByID (m_value)); 145 if (bp_site_sp) 146 { 147 if (bp_site_sp->GetNumberOfOwners() == 1) 148 { 149 BreakpointLocationSP bp_loc_sp = bp_site_sp->GetOwnerAtIndex(0); 150 if (bp_loc_sp) 151 { 152 m_break_id = bp_loc_sp->GetBreakpoint().GetID(); 153 m_was_one_shot = bp_loc_sp->GetBreakpoint().IsOneShot(); 154 } 155 } 156 m_address = bp_site_sp->GetLoadAddress(); 157 } 158 } 159 } 160 161 virtual ~StopInfoBreakpoint () 162 { 163 } 164 165 virtual StopReason 166 GetStopReason () const 167 { 168 return eStopReasonBreakpoint; 169 } 170 171 virtual bool 172 ShouldStopSynchronous (Event *event_ptr) 173 { 174 ThreadSP thread_sp (m_thread_wp.lock()); 175 if (thread_sp) 176 { 177 if (!m_should_stop_is_valid) 178 { 179 // Only check once if we should stop at a breakpoint 180 BreakpointSiteSP bp_site_sp (thread_sp->GetProcess()->GetBreakpointSiteList().FindByID (m_value)); 181 if (bp_site_sp) 182 { 183 ExecutionContext exe_ctx (thread_sp->GetStackFrameAtIndex(0)); 184 StoppointCallbackContext context (event_ptr, exe_ctx, true); 185 m_should_stop = bp_site_sp->ShouldStop (&context); 186 } 187 else 188 { 189 Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_PROCESS)); 190 191 if (log) 192 log->Printf ("Process::%s could not find breakpoint site id: %" PRId64 "...", __FUNCTION__, m_value); 193 194 m_should_stop = true; 195 } 196 m_should_stop_is_valid = true; 197 } 198 return m_should_stop; 199 } 200 return false; 201 } 202 203 virtual bool 204 ShouldNotify (Event *event_ptr) 205 { 206 ThreadSP thread_sp (m_thread_wp.lock()); 207 if (thread_sp) 208 { 209 BreakpointSiteSP bp_site_sp (thread_sp->GetProcess()->GetBreakpointSiteList().FindByID (m_value)); 210 if (bp_site_sp) 211 { 212 bool all_internal = true; 213 214 for (uint32_t i = 0; i < bp_site_sp->GetNumberOfOwners(); i++) 215 { 216 if (!bp_site_sp->GetOwnerAtIndex(i)->GetBreakpoint().IsInternal()) 217 { 218 all_internal = false; 219 break; 220 } 221 } 222 return all_internal == false; 223 } 224 } 225 return true; 226 } 227 228 virtual const char * 229 GetDescription () 230 { 231 if (m_description.empty()) 232 { 233 ThreadSP thread_sp (m_thread_wp.lock()); 234 if (thread_sp) 235 { 236 BreakpointSiteSP bp_site_sp (thread_sp->GetProcess()->GetBreakpointSiteList().FindByID (m_value)); 237 if (bp_site_sp) 238 { 239 StreamString strm; 240 // If we have just hit an internal breakpoint, and it has a kind description, print that instead of the 241 // full breakpoint printing: 242 if (bp_site_sp->IsInternal()) 243 { 244 size_t num_owners = bp_site_sp->GetNumberOfOwners(); 245 for (size_t idx = 0; idx < num_owners; idx++) 246 { 247 const char *kind = bp_site_sp->GetOwnerAtIndex(idx)->GetBreakpoint().GetBreakpointKind(); 248 if (kind != NULL) 249 { 250 m_description.assign (kind); 251 return kind; 252 } 253 } 254 } 255 256 strm.Printf("breakpoint "); 257 bp_site_sp->GetDescription(&strm, eDescriptionLevelBrief); 258 m_description.swap (strm.GetString()); 259 } 260 else 261 { 262 StreamString strm; 263 if (m_break_id != LLDB_INVALID_BREAK_ID) 264 { 265 BreakpointSP break_sp = thread_sp->GetProcess()->GetTarget().GetBreakpointByID(m_break_id); 266 if (break_sp) 267 { 268 if (break_sp->IsInternal()) 269 { 270 const char *kind = break_sp->GetBreakpointKind(); 271 if (kind) 272 strm.Printf ("internal %s breakpoint(%d).", kind, m_break_id); 273 else 274 strm.Printf ("internal breakpoint(%d).", m_break_id); 275 } 276 else 277 { 278 strm.Printf ("breakpoint %d.", m_break_id); 279 } 280 } 281 else 282 { 283 if (m_was_one_shot) 284 strm.Printf ("one-shot breakpoint %d", m_break_id); 285 else 286 strm.Printf ("breakpoint %d which has been deleted.", m_break_id); 287 } 288 } 289 else if (m_address == LLDB_INVALID_ADDRESS) 290 strm.Printf("breakpoint site %" PRIi64 " which has been deleted - unknown address", m_value); 291 else 292 strm.Printf("breakpoint site %" PRIi64 " which has been deleted - was at 0x%" PRIx64, m_value, m_address); 293 294 m_description.swap (strm.GetString()); 295 } 296 } 297 } 298 return m_description.c_str(); 299 } 300 301 protected: 302 bool 303 ShouldStop (Event *event_ptr) 304 { 305 // This just reports the work done by PerformAction or the synchronous stop. It should 306 // only ever get called after they have had a chance to run. 307 assert (m_should_stop_is_valid); 308 return m_should_stop; 309 } 310 311 virtual void 312 PerformAction (Event *event_ptr) 313 { 314 if (!m_should_perform_action) 315 return; 316 m_should_perform_action = false; 317 318 ThreadSP thread_sp (m_thread_wp.lock()); 319 320 if (thread_sp) 321 { 322 Log *log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_BREAKPOINTS); 323 324 if (!thread_sp->IsValid()) 325 { 326 // This shouldn't ever happen, but just in case, don't do more harm. 327 log->Printf ("PerformAction got called with an invalid thread."); 328 m_should_stop = true; 329 m_should_stop_is_valid = true; 330 return; 331 } 332 333 BreakpointSiteSP bp_site_sp (thread_sp->GetProcess()->GetBreakpointSiteList().FindByID (m_value)); 334 335 if (bp_site_sp) 336 { 337 size_t num_owners = bp_site_sp->GetNumberOfOwners(); 338 339 if (num_owners == 0) 340 { 341 m_should_stop = true; 342 } 343 else 344 { 345 // We go through each location, and test first its condition. If the condition says to stop, 346 // then we run the callback for that location. If that callback says to stop as well, then 347 // we set m_should_stop to true; we are going to stop. 348 // But we still want to give all the breakpoints whose conditions say we are going to stop a 349 // chance to run their callbacks. 350 // Of course if any callback restarts the target by putting "continue" in the callback, then 351 // we're going to restart, without running the rest of the callbacks. And in this case we will 352 // end up not stopping even if another location said we should stop. But that's better than not 353 // running all the callbacks. 354 355 m_should_stop = false; 356 357 ExecutionContext exe_ctx (thread_sp->GetStackFrameAtIndex(0)); 358 Process *process = exe_ctx.GetProcessPtr(); 359 if (process->GetModIDRef().IsLastResumeForUserExpression()) 360 { 361 // If we are in the middle of evaluating an expression, don't run asynchronous breakpoint commands or 362 // expressions. That could lead to infinite recursion if the command or condition re-calls the function 363 // with this breakpoint. 364 // TODO: We can keep a list of the breakpoints we've seen while running expressions in the nested 365 // PerformAction calls that can arise when the action runs a function that hits another breakpoint, 366 // and only stop running commands when we see the same breakpoint hit a second time. 367 368 m_should_stop_is_valid = true; 369 if (log) 370 log->Printf ("StopInfoBreakpoint::PerformAction - Hit a breakpoint while running an expression," 371 " not running commands to avoid recursion."); 372 bool ignoring_breakpoints = process->GetIgnoreBreakpointsInExpressions(); 373 if (ignoring_breakpoints) 374 { 375 m_should_stop = false; 376 // Internal breakpoints will always stop. 377 for (size_t j = 0; j < num_owners; j++) 378 { 379 lldb::BreakpointLocationSP bp_loc_sp = bp_site_sp->GetOwnerAtIndex(j); 380 if (bp_loc_sp->GetBreakpoint().IsInternal()) 381 { 382 m_should_stop = true; 383 break; 384 } 385 } 386 } 387 else 388 { 389 m_should_stop = true; 390 } 391 if (log) 392 log->Printf ("StopInfoBreakpoint::PerformAction - in expression, continuing: %s.", 393 m_should_stop ? "true" : "false"); 394 process->GetTarget().GetDebugger().GetAsyncOutputStream()->Printf("Warning: hit breakpoint while " 395 "running function, skipping commands and conditions to prevent recursion."); 396 return; 397 } 398 399 StoppointCallbackContext context (event_ptr, exe_ctx, false); 400 401 // Let's copy the breakpoint locations out of the site and store them in a local list. That way if 402 // one of the breakpoint actions changes the site, then we won't be operating on a bad list. 403 404 BreakpointLocationCollection site_locations; 405 for (size_t j = 0; j < num_owners; j++) 406 site_locations.Add(bp_site_sp->GetOwnerAtIndex(j)); 407 408 for (size_t j = 0; j < num_owners; j++) 409 { 410 lldb::BreakpointLocationSP bp_loc_sp = site_locations.GetByIndex(j); 411 412 // If another action disabled this breakpoint or its location, then don't run the actions. 413 if (!bp_loc_sp->IsEnabled() || !bp_loc_sp->GetBreakpoint().IsEnabled()) 414 continue; 415 416 // The breakpoint site may have many locations associated with it, not all of them valid for 417 // this thread. Skip the ones that aren't: 418 if (!bp_loc_sp->ValidForThisThread(thread_sp.get())) 419 continue; 420 421 // First run the condition for the breakpoint. If that says we should stop, then we'll run 422 // the callback for the breakpoint. If the callback says we shouldn't stop that will win. 423 424 if (bp_loc_sp->GetConditionText() != NULL) 425 { 426 Error condition_error; 427 bool condition_says_stop = bp_loc_sp->ConditionSaysStop(exe_ctx, condition_error); 428 429 if (!condition_error.Success()) 430 { 431 Debugger &debugger = exe_ctx.GetTargetRef().GetDebugger(); 432 StreamSP error_sp = debugger.GetAsyncErrorStream (); 433 error_sp->Printf ("Stopped due to an error evaluating condition of breakpoint "); 434 bp_loc_sp->GetDescription (error_sp.get(), eDescriptionLevelBrief); 435 error_sp->Printf (": \"%s\"", 436 bp_loc_sp->GetConditionText()); 437 error_sp->EOL(); 438 const char *err_str = condition_error.AsCString("<Unknown Error>"); 439 if (log) 440 log->Printf("Error evaluating condition: \"%s\"\n", err_str); 441 442 error_sp->PutCString (err_str); 443 error_sp->EOL(); 444 error_sp->Flush(); 445 // If the condition fails to be parsed or run, we should stop. 446 condition_says_stop = true; 447 } 448 else 449 { 450 if (!condition_says_stop) 451 continue; 452 } 453 } 454 455 bool callback_says_stop; 456 457 // FIXME: For now the callbacks have to run in async mode - the first time we restart we need 458 // to get out of there. So set it here. 459 // When we figure out how to nest breakpoint hits then this will change. 460 461 Debugger &debugger = thread_sp->CalculateTarget()->GetDebugger(); 462 bool old_async = debugger.GetAsyncExecution(); 463 debugger.SetAsyncExecution (true); 464 465 callback_says_stop = bp_loc_sp->InvokeCallback (&context); 466 467 debugger.SetAsyncExecution (old_async); 468 469 if (callback_says_stop) 470 m_should_stop = true; 471 472 // If we are going to stop for this breakpoint, then remove the breakpoint. 473 if (callback_says_stop && bp_loc_sp && bp_loc_sp->GetBreakpoint().IsOneShot()) 474 { 475 thread_sp->GetProcess()->GetTarget().RemoveBreakpointByID (bp_loc_sp->GetBreakpoint().GetID()); 476 } 477 478 // Also make sure that the callback hasn't continued the target. 479 // If it did, when we'll set m_should_start to false and get out of here. 480 if (HasTargetRunSinceMe ()) 481 { 482 m_should_stop = false; 483 break; 484 } 485 } 486 } 487 // We've figured out what this stop wants to do, so mark it as valid so we don't compute it again. 488 m_should_stop_is_valid = true; 489 490 } 491 else 492 { 493 m_should_stop = true; 494 m_should_stop_is_valid = true; 495 Log * log_process(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_PROCESS)); 496 497 if (log_process) 498 log_process->Printf ("Process::%s could not find breakpoint site id: %" PRId64 "...", __FUNCTION__, m_value); 499 } 500 if (log) 501 log->Printf ("Process::%s returning from action with m_should_stop: %d.", __FUNCTION__, m_should_stop); 502 } 503 } 504 505 private: 506 std::string m_description; 507 bool m_should_stop; 508 bool m_should_stop_is_valid; 509 bool m_should_perform_action; // Since we are trying to preserve the "state" of the system even if we run functions 510 // etc. behind the users backs, we need to make sure we only REALLY perform the action once. 511 lldb::addr_t m_address; // We use this to capture the breakpoint site address when we create the StopInfo, 512 // in case somebody deletes it between the time the StopInfo is made and the 513 // description is asked for. 514 lldb::break_id_t m_break_id; 515 bool m_was_one_shot; 516 }; 517 518 519 //---------------------------------------------------------------------- 520 // StopInfoWatchpoint 521 //---------------------------------------------------------------------- 522 523 class StopInfoWatchpoint : public StopInfo 524 { 525 public: 526 // Make sure watchpoint is properly disabled and subsequently enabled while performing watchpoint actions. 527 class WatchpointSentry { 528 public: 529 WatchpointSentry(Process *p, Watchpoint *w): 530 process(p), 531 watchpoint(w) 532 { 533 if (process && watchpoint) 534 { 535 const bool notify = false; 536 watchpoint->TurnOnEphemeralMode(); 537 process->DisableWatchpoint(watchpoint, notify); 538 } 539 } 540 ~WatchpointSentry() 541 { 542 if (process && watchpoint) 543 { 544 if (!watchpoint->IsDisabledDuringEphemeralMode()) 545 { 546 const bool notify = false; 547 process->EnableWatchpoint(watchpoint, notify); 548 } 549 watchpoint->TurnOffEphemeralMode(); 550 } 551 } 552 private: 553 Process *process; 554 Watchpoint *watchpoint; 555 }; 556 557 StopInfoWatchpoint (Thread &thread, break_id_t watch_id) : 558 StopInfo(thread, watch_id), 559 m_description(), 560 m_should_stop(false), 561 m_should_stop_is_valid(false) 562 { 563 } 564 565 virtual ~StopInfoWatchpoint () 566 { 567 } 568 569 virtual StopReason 570 GetStopReason () const 571 { 572 return eStopReasonWatchpoint; 573 } 574 575 virtual const char * 576 GetDescription () 577 { 578 if (m_description.empty()) 579 { 580 StreamString strm; 581 strm.Printf("watchpoint %" PRIi64, m_value); 582 m_description.swap (strm.GetString()); 583 } 584 return m_description.c_str(); 585 } 586 587 protected: 588 virtual bool 589 ShouldStopSynchronous (Event *event_ptr) 590 { 591 // ShouldStop() method is idempotent and should not affect hit count. 592 // See Process::RunPrivateStateThread()->Process()->HandlePrivateEvent() 593 // -->Process()::ShouldBroadcastEvent()->ThreadList::ShouldStop()-> 594 // Thread::ShouldStop()->ThreadPlanBase::ShouldStop()-> 595 // StopInfoWatchpoint::ShouldStop() and 596 // Event::DoOnRemoval()->Process::ProcessEventData::DoOnRemoval()-> 597 // StopInfoWatchpoint::PerformAction(). 598 if (m_should_stop_is_valid) 599 return m_should_stop; 600 601 ThreadSP thread_sp (m_thread_wp.lock()); 602 if (thread_sp) 603 { 604 WatchpointSP wp_sp (thread_sp->CalculateTarget()->GetWatchpointList().FindByID(GetValue())); 605 if (wp_sp) 606 { 607 // Check if we should stop at a watchpoint. 608 ExecutionContext exe_ctx (thread_sp->GetStackFrameAtIndex(0)); 609 StoppointCallbackContext context (event_ptr, exe_ctx, true); 610 m_should_stop = wp_sp->ShouldStop (&context); 611 } 612 else 613 { 614 Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_PROCESS)); 615 616 if (log) 617 log->Printf ("Process::%s could not find watchpoint location id: %" PRId64 "...", 618 __FUNCTION__, GetValue()); 619 620 m_should_stop = true; 621 } 622 } 623 m_should_stop_is_valid = true; 624 return m_should_stop; 625 } 626 627 bool 628 ShouldStop (Event *event_ptr) 629 { 630 // This just reports the work done by PerformAction or the synchronous stop. It should 631 // only ever get called after they have had a chance to run. 632 assert (m_should_stop_is_valid); 633 return m_should_stop; 634 } 635 636 virtual void 637 PerformAction (Event *event_ptr) 638 { 639 Log *log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_WATCHPOINTS); 640 // We're going to calculate if we should stop or not in some way during the course of 641 // this code. Also by default we're going to stop, so set that here. 642 m_should_stop = true; 643 644 ThreadSP thread_sp (m_thread_wp.lock()); 645 if (thread_sp) 646 { 647 648 WatchpointSP wp_sp (thread_sp->CalculateTarget()->GetWatchpointList().FindByID(GetValue())); 649 if (wp_sp) 650 { 651 ExecutionContext exe_ctx (thread_sp->GetStackFrameAtIndex(0)); 652 Process* process = exe_ctx.GetProcessPtr(); 653 654 // This sentry object makes sure the current watchpoint is disabled while performing watchpoint actions, 655 // and it is then enabled after we are finished. 656 WatchpointSentry sentry(process, wp_sp.get()); 657 658 { 659 // check if this process is running on an architecture where watchpoints trigger 660 // before the associated instruction runs. if so, disable the WP, single-step and then 661 // re-enable the watchpoint 662 if (process) 663 { 664 uint32_t num; bool wp_triggers_after; 665 if (process->GetWatchpointSupportInfo(num, wp_triggers_after).Success()) 666 { 667 if (!wp_triggers_after) 668 { 669 ThreadPlan *new_plan = thread_sp->QueueThreadPlanForStepSingleInstruction(false, // step-over 670 false, // abort_other_plans 671 true); // stop_other_threads 672 new_plan->SetIsMasterPlan (true); 673 new_plan->SetOkayToDiscard (false); 674 process->GetThreadList().SetSelectedThreadByID (thread_sp->GetID()); 675 process->Resume (); 676 process->WaitForProcessToStop (NULL); 677 process->GetThreadList().SetSelectedThreadByID (thread_sp->GetID()); 678 MakeStopInfoValid(); // make sure we do not fail to stop because of the single-step taken above 679 } 680 } 681 } 682 } 683 684 if (m_should_stop && wp_sp->GetConditionText() != NULL) 685 { 686 // We need to make sure the user sees any parse errors in their condition, so we'll hook the 687 // constructor errors up to the debugger's Async I/O. 688 ExecutionResults result_code; 689 ValueObjectSP result_value_sp; 690 const bool unwind_on_error = true; 691 const bool ignore_breakpoints = true; 692 Error error; 693 result_code = ClangUserExpression::EvaluateWithError (exe_ctx, 694 eExecutionPolicyOnlyWhenNeeded, 695 lldb::eLanguageTypeUnknown, 696 ClangUserExpression::eResultTypeAny, 697 unwind_on_error, 698 ignore_breakpoints, 699 wp_sp->GetConditionText(), 700 NULL, 701 result_value_sp, 702 error, 703 true, 704 ClangUserExpression::kDefaultTimeout); 705 if (result_code == eExecutionCompleted) 706 { 707 if (result_value_sp) 708 { 709 Scalar scalar_value; 710 if (result_value_sp->ResolveValue (scalar_value)) 711 { 712 if (scalar_value.ULongLong(1) == 0) 713 { 714 // We have been vetoed. This takes precedence over querying 715 // the watchpoint whether it should stop (aka ignore count and 716 // friends). See also StopInfoWatchpoint::ShouldStop() as well 717 // as Process::ProcessEventData::DoOnRemoval(). 718 m_should_stop = false; 719 } 720 else 721 m_should_stop = true; 722 if (log) 723 log->Printf("Condition successfully evaluated, result is %s.\n", 724 m_should_stop ? "true" : "false"); 725 } 726 else 727 { 728 m_should_stop = true; 729 if (log) 730 log->Printf("Failed to get an integer result from the expression."); 731 } 732 } 733 } 734 else 735 { 736 Debugger &debugger = exe_ctx.GetTargetRef().GetDebugger(); 737 StreamSP error_sp = debugger.GetAsyncErrorStream (); 738 error_sp->Printf ("Stopped due to an error evaluating condition of watchpoint "); 739 wp_sp->GetDescription (error_sp.get(), eDescriptionLevelBrief); 740 error_sp->Printf (": \"%s\"", 741 wp_sp->GetConditionText()); 742 error_sp->EOL(); 743 const char *err_str = error.AsCString("<Unknown Error>"); 744 if (log) 745 log->Printf("Error evaluating condition: \"%s\"\n", err_str); 746 747 error_sp->PutCString (err_str); 748 error_sp->EOL(); 749 error_sp->Flush(); 750 // If the condition fails to be parsed or run, we should stop. 751 m_should_stop = true; 752 } 753 } 754 755 // If the condition says to stop, we run the callback to further decide whether to stop. 756 if (m_should_stop) 757 { 758 StoppointCallbackContext context (event_ptr, exe_ctx, false); 759 bool stop_requested = wp_sp->InvokeCallback (&context); 760 // Also make sure that the callback hasn't continued the target. 761 // If it did, when we'll set m_should_stop to false and get out of here. 762 if (HasTargetRunSinceMe ()) 763 m_should_stop = false; 764 765 if (m_should_stop && !stop_requested) 766 { 767 // We have been vetoed by the callback mechanism. 768 m_should_stop = false; 769 } 770 } 771 // Finally, if we are going to stop, print out the new & old values: 772 if (m_should_stop) 773 { 774 wp_sp->CaptureWatchedValue(exe_ctx); 775 776 Debugger &debugger = exe_ctx.GetTargetRef().GetDebugger(); 777 StreamSP output_sp = debugger.GetAsyncOutputStream (); 778 wp_sp->DumpSnapshots(output_sp.get()); 779 output_sp->EOL(); 780 output_sp->Flush(); 781 } 782 783 } 784 else 785 { 786 Log * log_process(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_PROCESS)); 787 788 if (log_process) 789 log_process->Printf ("Process::%s could not find watchpoint id: %" PRId64 "...", __FUNCTION__, m_value); 790 } 791 if (log) 792 log->Printf ("Process::%s returning from action with m_should_stop: %d.", __FUNCTION__, m_should_stop); 793 794 m_should_stop_is_valid = true; 795 } 796 } 797 798 private: 799 std::string m_description; 800 bool m_should_stop; 801 bool m_should_stop_is_valid; 802 }; 803 804 805 806 //---------------------------------------------------------------------- 807 // StopInfoUnixSignal 808 //---------------------------------------------------------------------- 809 810 class StopInfoUnixSignal : public StopInfo 811 { 812 public: 813 814 StopInfoUnixSignal (Thread &thread, int signo) : 815 StopInfo (thread, signo) 816 { 817 } 818 819 virtual ~StopInfoUnixSignal () 820 { 821 } 822 823 824 virtual StopReason 825 GetStopReason () const 826 { 827 return eStopReasonSignal; 828 } 829 830 virtual bool 831 ShouldStopSynchronous (Event *event_ptr) 832 { 833 ThreadSP thread_sp (m_thread_wp.lock()); 834 if (thread_sp) 835 return thread_sp->GetProcess()->GetUnixSignals().GetShouldStop (m_value); 836 return false; 837 } 838 839 virtual bool 840 ShouldStop (Event *event_ptr) 841 { 842 ThreadSP thread_sp (m_thread_wp.lock()); 843 if (thread_sp) 844 return thread_sp->GetProcess()->GetUnixSignals().GetShouldStop (m_value); 845 return false; 846 } 847 848 849 // If should stop returns false, check if we should notify of this event 850 virtual bool 851 ShouldNotify (Event *event_ptr) 852 { 853 ThreadSP thread_sp (m_thread_wp.lock()); 854 if (thread_sp) 855 { 856 bool should_notify = thread_sp->GetProcess()->GetUnixSignals().GetShouldNotify (m_value); 857 if (should_notify) 858 { 859 StreamString strm; 860 strm.Printf ("thread %d received signal: %s", 861 thread_sp->GetIndexID(), 862 thread_sp->GetProcess()->GetUnixSignals().GetSignalAsCString (m_value)); 863 Process::ProcessEventData::AddRestartedReason(event_ptr, strm.GetData()); 864 } 865 return should_notify; 866 } 867 return true; 868 } 869 870 871 virtual void 872 WillResume (lldb::StateType resume_state) 873 { 874 ThreadSP thread_sp (m_thread_wp.lock()); 875 if (thread_sp) 876 { 877 if (thread_sp->GetProcess()->GetUnixSignals().GetShouldSuppress(m_value) == false) 878 thread_sp->SetResumeSignal(m_value); 879 } 880 } 881 882 virtual const char * 883 GetDescription () 884 { 885 if (m_description.empty()) 886 { 887 ThreadSP thread_sp (m_thread_wp.lock()); 888 if (thread_sp) 889 { 890 StreamString strm; 891 const char *signal_name = thread_sp->GetProcess()->GetUnixSignals().GetSignalAsCString (m_value); 892 if (signal_name) 893 strm.Printf("signal %s", signal_name); 894 else 895 strm.Printf("signal %" PRIi64, m_value); 896 m_description.swap (strm.GetString()); 897 } 898 } 899 return m_description.c_str(); 900 } 901 }; 902 903 //---------------------------------------------------------------------- 904 // StopInfoTrace 905 //---------------------------------------------------------------------- 906 907 class StopInfoTrace : public StopInfo 908 { 909 public: 910 911 StopInfoTrace (Thread &thread) : 912 StopInfo (thread, LLDB_INVALID_UID) 913 { 914 } 915 916 virtual ~StopInfoTrace () 917 { 918 } 919 920 virtual StopReason 921 GetStopReason () const 922 { 923 return eStopReasonTrace; 924 } 925 926 virtual const char * 927 GetDescription () 928 { 929 if (m_description.empty()) 930 return "trace"; 931 else 932 return m_description.c_str(); 933 } 934 }; 935 936 937 //---------------------------------------------------------------------- 938 // StopInfoException 939 //---------------------------------------------------------------------- 940 941 class StopInfoException : public StopInfo 942 { 943 public: 944 945 StopInfoException (Thread &thread, const char *description) : 946 StopInfo (thread, LLDB_INVALID_UID) 947 { 948 if (description) 949 SetDescription (description); 950 } 951 952 virtual 953 ~StopInfoException () 954 { 955 } 956 957 virtual StopReason 958 GetStopReason () const 959 { 960 return eStopReasonException; 961 } 962 963 virtual const char * 964 GetDescription () 965 { 966 if (m_description.empty()) 967 return "exception"; 968 else 969 return m_description.c_str(); 970 } 971 }; 972 973 974 //---------------------------------------------------------------------- 975 // StopInfoThreadPlan 976 //---------------------------------------------------------------------- 977 978 class StopInfoThreadPlan : public StopInfo 979 { 980 public: 981 982 StopInfoThreadPlan (ThreadPlanSP &plan_sp, ValueObjectSP &return_valobj_sp) : 983 StopInfo (plan_sp->GetThread(), LLDB_INVALID_UID), 984 m_plan_sp (plan_sp), 985 m_return_valobj_sp (return_valobj_sp) 986 { 987 } 988 989 virtual ~StopInfoThreadPlan () 990 { 991 } 992 993 virtual StopReason 994 GetStopReason () const 995 { 996 return eStopReasonPlanComplete; 997 } 998 999 virtual const char * 1000 GetDescription () 1001 { 1002 if (m_description.empty()) 1003 { 1004 StreamString strm; 1005 m_plan_sp->GetDescription (&strm, eDescriptionLevelBrief); 1006 m_description.swap (strm.GetString()); 1007 } 1008 return m_description.c_str(); 1009 } 1010 1011 ValueObjectSP 1012 GetReturnValueObject() 1013 { 1014 return m_return_valobj_sp; 1015 } 1016 1017 protected: 1018 virtual bool 1019 ShouldStop (Event *event_ptr) 1020 { 1021 if (m_plan_sp) 1022 return m_plan_sp->ShouldStop(event_ptr); 1023 else 1024 return StopInfo::ShouldStop(event_ptr); 1025 } 1026 1027 private: 1028 ThreadPlanSP m_plan_sp; 1029 ValueObjectSP m_return_valobj_sp; 1030 }; 1031 1032 class StopInfoExec : public StopInfo 1033 { 1034 public: 1035 1036 StopInfoExec (Thread &thread) : 1037 StopInfo (thread, LLDB_INVALID_UID), 1038 m_performed_action (false) 1039 { 1040 } 1041 1042 virtual 1043 ~StopInfoExec () 1044 { 1045 } 1046 1047 virtual StopReason 1048 GetStopReason () const 1049 { 1050 return eStopReasonExec; 1051 } 1052 1053 virtual const char * 1054 GetDescription () 1055 { 1056 return "exec"; 1057 } 1058 protected: 1059 1060 virtual void 1061 PerformAction (Event *event_ptr) 1062 { 1063 // Only perform the action once 1064 if (m_performed_action) 1065 return; 1066 m_performed_action = true; 1067 ThreadSP thread_sp (m_thread_wp.lock()); 1068 if (thread_sp) 1069 thread_sp->GetProcess()->DidExec(); 1070 } 1071 1072 bool m_performed_action; 1073 }; 1074 1075 } // namespace lldb_private 1076 1077 StopInfoSP 1078 StopInfo::CreateStopReasonWithBreakpointSiteID (Thread &thread, break_id_t break_id) 1079 { 1080 return StopInfoSP (new StopInfoBreakpoint (thread, break_id)); 1081 } 1082 1083 StopInfoSP 1084 StopInfo::CreateStopReasonWithBreakpointSiteID (Thread &thread, break_id_t break_id, bool should_stop) 1085 { 1086 return StopInfoSP (new StopInfoBreakpoint (thread, break_id, should_stop)); 1087 } 1088 1089 StopInfoSP 1090 StopInfo::CreateStopReasonWithWatchpointID (Thread &thread, break_id_t watch_id) 1091 { 1092 return StopInfoSP (new StopInfoWatchpoint (thread, watch_id)); 1093 } 1094 1095 StopInfoSP 1096 StopInfo::CreateStopReasonWithSignal (Thread &thread, int signo) 1097 { 1098 return StopInfoSP (new StopInfoUnixSignal (thread, signo)); 1099 } 1100 1101 StopInfoSP 1102 StopInfo::CreateStopReasonToTrace (Thread &thread) 1103 { 1104 return StopInfoSP (new StopInfoTrace (thread)); 1105 } 1106 1107 StopInfoSP 1108 StopInfo::CreateStopReasonWithPlan (ThreadPlanSP &plan_sp, ValueObjectSP return_valobj_sp) 1109 { 1110 return StopInfoSP (new StopInfoThreadPlan (plan_sp, return_valobj_sp)); 1111 } 1112 1113 StopInfoSP 1114 StopInfo::CreateStopReasonWithException (Thread &thread, const char *description) 1115 { 1116 return StopInfoSP (new StopInfoException (thread, description)); 1117 } 1118 1119 StopInfoSP 1120 StopInfo::CreateStopReasonWithExec (Thread &thread) 1121 { 1122 return StopInfoSP (new StopInfoExec (thread)); 1123 } 1124 1125 ValueObjectSP 1126 StopInfo::GetReturnValueObject(StopInfoSP &stop_info_sp) 1127 { 1128 if (stop_info_sp && stop_info_sp->GetStopReason() == eStopReasonPlanComplete) 1129 { 1130 StopInfoThreadPlan *plan_stop_info = static_cast<StopInfoThreadPlan *>(stop_info_sp.get()); 1131 return plan_stop_info->GetReturnValueObject(); 1132 } 1133 else 1134 return ValueObjectSP(); 1135 } 1136