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_should_notify (eLazyBoolCalculate), 43 m_override_should_stop (eLazyBoolCalculate) 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 DoShouldNotify (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; 665 bool wp_triggers_after; 666 if (process->GetWatchpointSupportInfo(num, wp_triggers_after).Success()) 667 { 668 if (!wp_triggers_after) 669 { 670 ThreadPlan *new_plan = thread_sp->QueueThreadPlanForStepSingleInstruction(false, // step-over 671 false, // abort_other_plans 672 true); // stop_other_threads 673 new_plan->SetIsMasterPlan (true); 674 new_plan->SetOkayToDiscard (false); 675 process->GetThreadList().SetSelectedThreadByID (thread_sp->GetID()); 676 process->Resume (); 677 process->WaitForProcessToStop (NULL); 678 process->GetThreadList().SetSelectedThreadByID (thread_sp->GetID()); 679 MakeStopInfoValid(); // make sure we do not fail to stop because of the single-step taken above 680 } 681 } 682 } 683 } 684 685 if (m_should_stop && wp_sp->GetConditionText() != NULL) 686 { 687 // We need to make sure the user sees any parse errors in their condition, so we'll hook the 688 // constructor errors up to the debugger's Async I/O. 689 ExecutionResults result_code; 690 ValueObjectSP result_value_sp; 691 const bool unwind_on_error = true; 692 const bool ignore_breakpoints = true; 693 Error error; 694 result_code = ClangUserExpression::EvaluateWithError (exe_ctx, 695 eExecutionPolicyOnlyWhenNeeded, 696 lldb::eLanguageTypeUnknown, 697 ClangUserExpression::eResultTypeAny, 698 unwind_on_error, 699 ignore_breakpoints, 700 wp_sp->GetConditionText(), 701 NULL, 702 result_value_sp, 703 error, 704 true, 705 ClangUserExpression::kDefaultTimeout); 706 if (result_code == eExecutionCompleted) 707 { 708 if (result_value_sp) 709 { 710 Scalar scalar_value; 711 if (result_value_sp->ResolveValue (scalar_value)) 712 { 713 if (scalar_value.ULongLong(1) == 0) 714 { 715 // We have been vetoed. This takes precedence over querying 716 // the watchpoint whether it should stop (aka ignore count and 717 // friends). See also StopInfoWatchpoint::ShouldStop() as well 718 // as Process::ProcessEventData::DoOnRemoval(). 719 m_should_stop = false; 720 } 721 else 722 m_should_stop = true; 723 if (log) 724 log->Printf("Condition successfully evaluated, result is %s.\n", 725 m_should_stop ? "true" : "false"); 726 } 727 else 728 { 729 m_should_stop = true; 730 if (log) 731 log->Printf("Failed to get an integer result from the expression."); 732 } 733 } 734 } 735 else 736 { 737 Debugger &debugger = exe_ctx.GetTargetRef().GetDebugger(); 738 StreamSP error_sp = debugger.GetAsyncErrorStream (); 739 error_sp->Printf ("Stopped due to an error evaluating condition of watchpoint "); 740 wp_sp->GetDescription (error_sp.get(), eDescriptionLevelBrief); 741 error_sp->Printf (": \"%s\"", 742 wp_sp->GetConditionText()); 743 error_sp->EOL(); 744 const char *err_str = error.AsCString("<Unknown Error>"); 745 if (log) 746 log->Printf("Error evaluating condition: \"%s\"\n", err_str); 747 748 error_sp->PutCString (err_str); 749 error_sp->EOL(); 750 error_sp->Flush(); 751 // If the condition fails to be parsed or run, we should stop. 752 m_should_stop = true; 753 } 754 } 755 756 // If the condition says to stop, we run the callback to further decide whether to stop. 757 if (m_should_stop) 758 { 759 StoppointCallbackContext context (event_ptr, exe_ctx, false); 760 bool stop_requested = wp_sp->InvokeCallback (&context); 761 // Also make sure that the callback hasn't continued the target. 762 // If it did, when we'll set m_should_stop to false and get out of here. 763 if (HasTargetRunSinceMe ()) 764 m_should_stop = false; 765 766 if (m_should_stop && !stop_requested) 767 { 768 // We have been vetoed by the callback mechanism. 769 m_should_stop = false; 770 } 771 } 772 // Finally, if we are going to stop, print out the new & old values: 773 if (m_should_stop) 774 { 775 wp_sp->CaptureWatchedValue(exe_ctx); 776 777 Debugger &debugger = exe_ctx.GetTargetRef().GetDebugger(); 778 StreamSP output_sp = debugger.GetAsyncOutputStream (); 779 wp_sp->DumpSnapshots(output_sp.get()); 780 output_sp->EOL(); 781 output_sp->Flush(); 782 } 783 784 } 785 else 786 { 787 Log * log_process(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_PROCESS)); 788 789 if (log_process) 790 log_process->Printf ("Process::%s could not find watchpoint id: %" PRId64 "...", __FUNCTION__, m_value); 791 } 792 if (log) 793 log->Printf ("Process::%s returning from action with m_should_stop: %d.", __FUNCTION__, m_should_stop); 794 795 m_should_stop_is_valid = true; 796 } 797 } 798 799 private: 800 std::string m_description; 801 bool m_should_stop; 802 bool m_should_stop_is_valid; 803 }; 804 805 806 807 //---------------------------------------------------------------------- 808 // StopInfoUnixSignal 809 //---------------------------------------------------------------------- 810 811 class StopInfoUnixSignal : public StopInfo 812 { 813 public: 814 815 StopInfoUnixSignal (Thread &thread, int signo) : 816 StopInfo (thread, signo) 817 { 818 } 819 820 virtual ~StopInfoUnixSignal () 821 { 822 } 823 824 825 virtual StopReason 826 GetStopReason () const 827 { 828 return eStopReasonSignal; 829 } 830 831 virtual bool 832 ShouldStopSynchronous (Event *event_ptr) 833 { 834 ThreadSP thread_sp (m_thread_wp.lock()); 835 if (thread_sp) 836 return thread_sp->GetProcess()->GetUnixSignals().GetShouldStop (m_value); 837 return false; 838 } 839 840 virtual bool 841 ShouldStop (Event *event_ptr) 842 { 843 ThreadSP thread_sp (m_thread_wp.lock()); 844 if (thread_sp) 845 return thread_sp->GetProcess()->GetUnixSignals().GetShouldStop (m_value); 846 return false; 847 } 848 849 850 // If should stop returns false, check if we should notify of this event 851 virtual bool 852 DoShouldNotify (Event *event_ptr) 853 { 854 ThreadSP thread_sp (m_thread_wp.lock()); 855 if (thread_sp) 856 { 857 bool should_notify = thread_sp->GetProcess()->GetUnixSignals().GetShouldNotify (m_value); 858 if (should_notify) 859 { 860 StreamString strm; 861 strm.Printf ("thread %d received signal: %s", 862 thread_sp->GetIndexID(), 863 thread_sp->GetProcess()->GetUnixSignals().GetSignalAsCString (m_value)); 864 Process::ProcessEventData::AddRestartedReason(event_ptr, strm.GetData()); 865 } 866 return should_notify; 867 } 868 return true; 869 } 870 871 872 virtual void 873 WillResume (lldb::StateType resume_state) 874 { 875 ThreadSP thread_sp (m_thread_wp.lock()); 876 if (thread_sp) 877 { 878 if (thread_sp->GetProcess()->GetUnixSignals().GetShouldSuppress(m_value) == false) 879 thread_sp->SetResumeSignal(m_value); 880 } 881 } 882 883 virtual const char * 884 GetDescription () 885 { 886 if (m_description.empty()) 887 { 888 ThreadSP thread_sp (m_thread_wp.lock()); 889 if (thread_sp) 890 { 891 StreamString strm; 892 const char *signal_name = thread_sp->GetProcess()->GetUnixSignals().GetSignalAsCString (m_value); 893 if (signal_name) 894 strm.Printf("signal %s", signal_name); 895 else 896 strm.Printf("signal %" PRIi64, m_value); 897 m_description.swap (strm.GetString()); 898 } 899 } 900 return m_description.c_str(); 901 } 902 }; 903 904 //---------------------------------------------------------------------- 905 // StopInfoTrace 906 //---------------------------------------------------------------------- 907 908 class StopInfoTrace : public StopInfo 909 { 910 public: 911 912 StopInfoTrace (Thread &thread) : 913 StopInfo (thread, LLDB_INVALID_UID) 914 { 915 } 916 917 virtual ~StopInfoTrace () 918 { 919 } 920 921 virtual StopReason 922 GetStopReason () const 923 { 924 return eStopReasonTrace; 925 } 926 927 virtual const char * 928 GetDescription () 929 { 930 if (m_description.empty()) 931 return "trace"; 932 else 933 return m_description.c_str(); 934 } 935 }; 936 937 938 //---------------------------------------------------------------------- 939 // StopInfoException 940 //---------------------------------------------------------------------- 941 942 class StopInfoException : public StopInfo 943 { 944 public: 945 946 StopInfoException (Thread &thread, const char *description) : 947 StopInfo (thread, LLDB_INVALID_UID) 948 { 949 if (description) 950 SetDescription (description); 951 } 952 953 virtual 954 ~StopInfoException () 955 { 956 } 957 958 virtual StopReason 959 GetStopReason () const 960 { 961 return eStopReasonException; 962 } 963 964 virtual const char * 965 GetDescription () 966 { 967 if (m_description.empty()) 968 return "exception"; 969 else 970 return m_description.c_str(); 971 } 972 }; 973 974 975 //---------------------------------------------------------------------- 976 // StopInfoThreadPlan 977 //---------------------------------------------------------------------- 978 979 class StopInfoThreadPlan : public StopInfo 980 { 981 public: 982 983 StopInfoThreadPlan (ThreadPlanSP &plan_sp, ValueObjectSP &return_valobj_sp) : 984 StopInfo (plan_sp->GetThread(), LLDB_INVALID_UID), 985 m_plan_sp (plan_sp), 986 m_return_valobj_sp (return_valobj_sp) 987 { 988 } 989 990 virtual ~StopInfoThreadPlan () 991 { 992 } 993 994 virtual StopReason 995 GetStopReason () const 996 { 997 return eStopReasonPlanComplete; 998 } 999 1000 virtual const char * 1001 GetDescription () 1002 { 1003 if (m_description.empty()) 1004 { 1005 StreamString strm; 1006 m_plan_sp->GetDescription (&strm, eDescriptionLevelBrief); 1007 m_description.swap (strm.GetString()); 1008 } 1009 return m_description.c_str(); 1010 } 1011 1012 ValueObjectSP 1013 GetReturnValueObject() 1014 { 1015 return m_return_valobj_sp; 1016 } 1017 1018 protected: 1019 virtual bool 1020 ShouldStop (Event *event_ptr) 1021 { 1022 if (m_plan_sp) 1023 return m_plan_sp->ShouldStop(event_ptr); 1024 else 1025 return StopInfo::ShouldStop(event_ptr); 1026 } 1027 1028 private: 1029 ThreadPlanSP m_plan_sp; 1030 ValueObjectSP m_return_valobj_sp; 1031 }; 1032 1033 class StopInfoExec : public StopInfo 1034 { 1035 public: 1036 1037 StopInfoExec (Thread &thread) : 1038 StopInfo (thread, LLDB_INVALID_UID), 1039 m_performed_action (false) 1040 { 1041 } 1042 1043 virtual 1044 ~StopInfoExec () 1045 { 1046 } 1047 1048 virtual StopReason 1049 GetStopReason () const 1050 { 1051 return eStopReasonExec; 1052 } 1053 1054 virtual const char * 1055 GetDescription () 1056 { 1057 return "exec"; 1058 } 1059 protected: 1060 1061 virtual void 1062 PerformAction (Event *event_ptr) 1063 { 1064 // Only perform the action once 1065 if (m_performed_action) 1066 return; 1067 m_performed_action = true; 1068 ThreadSP thread_sp (m_thread_wp.lock()); 1069 if (thread_sp) 1070 thread_sp->GetProcess()->DidExec(); 1071 } 1072 1073 bool m_performed_action; 1074 }; 1075 1076 } // namespace lldb_private 1077 1078 StopInfoSP 1079 StopInfo::CreateStopReasonWithBreakpointSiteID (Thread &thread, break_id_t break_id) 1080 { 1081 return StopInfoSP (new StopInfoBreakpoint (thread, break_id)); 1082 } 1083 1084 StopInfoSP 1085 StopInfo::CreateStopReasonWithBreakpointSiteID (Thread &thread, break_id_t break_id, bool should_stop) 1086 { 1087 return StopInfoSP (new StopInfoBreakpoint (thread, break_id, should_stop)); 1088 } 1089 1090 StopInfoSP 1091 StopInfo::CreateStopReasonWithWatchpointID (Thread &thread, break_id_t watch_id) 1092 { 1093 return StopInfoSP (new StopInfoWatchpoint (thread, watch_id)); 1094 } 1095 1096 StopInfoSP 1097 StopInfo::CreateStopReasonWithSignal (Thread &thread, int signo) 1098 { 1099 return StopInfoSP (new StopInfoUnixSignal (thread, signo)); 1100 } 1101 1102 StopInfoSP 1103 StopInfo::CreateStopReasonToTrace (Thread &thread) 1104 { 1105 return StopInfoSP (new StopInfoTrace (thread)); 1106 } 1107 1108 StopInfoSP 1109 StopInfo::CreateStopReasonWithPlan (ThreadPlanSP &plan_sp, ValueObjectSP return_valobj_sp) 1110 { 1111 return StopInfoSP (new StopInfoThreadPlan (plan_sp, return_valobj_sp)); 1112 } 1113 1114 StopInfoSP 1115 StopInfo::CreateStopReasonWithException (Thread &thread, const char *description) 1116 { 1117 return StopInfoSP (new StopInfoException (thread, description)); 1118 } 1119 1120 StopInfoSP 1121 StopInfo::CreateStopReasonWithExec (Thread &thread) 1122 { 1123 return StopInfoSP (new StopInfoExec (thread)); 1124 } 1125 1126 ValueObjectSP 1127 StopInfo::GetReturnValueObject(StopInfoSP &stop_info_sp) 1128 { 1129 if (stop_info_sp && stop_info_sp->GetStopReason() == eStopReasonPlanComplete) 1130 { 1131 StopInfoThreadPlan *plan_stop_info = static_cast<StopInfoThreadPlan *>(stop_info_sp.get()); 1132 return plan_stop_info->GetReturnValueObject(); 1133 } 1134 else 1135 return ValueObjectSP(); 1136 } 1137