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 if (log) 328 { 329 log->Printf ("PerformAction got called with an invalid thread."); 330 } 331 m_should_stop = true; 332 m_should_stop_is_valid = true; 333 return; 334 } 335 336 BreakpointSiteSP bp_site_sp (thread_sp->GetProcess()->GetBreakpointSiteList().FindByID (m_value)); 337 338 if (bp_site_sp) 339 { 340 size_t num_owners = bp_site_sp->GetNumberOfOwners(); 341 342 if (num_owners == 0) 343 { 344 m_should_stop = true; 345 } 346 else 347 { 348 // We go through each location, and test first its condition. If the condition says to stop, 349 // then we run the callback for that location. If that callback says to stop as well, then 350 // we set m_should_stop to true; we are going to stop. 351 // But we still want to give all the breakpoints whose conditions say we are going to stop a 352 // chance to run their callbacks. 353 // Of course if any callback restarts the target by putting "continue" in the callback, then 354 // we're going to restart, without running the rest of the callbacks. And in this case we will 355 // end up not stopping even if another location said we should stop. But that's better than not 356 // running all the callbacks. 357 358 m_should_stop = false; 359 360 ExecutionContext exe_ctx (thread_sp->GetStackFrameAtIndex(0)); 361 Process *process = exe_ctx.GetProcessPtr(); 362 if (process->GetModIDRef().IsLastResumeForUserExpression()) 363 { 364 // If we are in the middle of evaluating an expression, don't run asynchronous breakpoint commands or 365 // expressions. That could lead to infinite recursion if the command or condition re-calls the function 366 // with this breakpoint. 367 // TODO: We can keep a list of the breakpoints we've seen while running expressions in the nested 368 // PerformAction calls that can arise when the action runs a function that hits another breakpoint, 369 // and only stop running commands when we see the same breakpoint hit a second time. 370 371 m_should_stop_is_valid = true; 372 if (log) 373 log->Printf ("StopInfoBreakpoint::PerformAction - Hit a breakpoint while running an expression," 374 " not running commands to avoid recursion."); 375 bool ignoring_breakpoints = process->GetIgnoreBreakpointsInExpressions(); 376 if (ignoring_breakpoints) 377 { 378 m_should_stop = false; 379 // Internal breakpoints will always stop. 380 for (size_t j = 0; j < num_owners; j++) 381 { 382 lldb::BreakpointLocationSP bp_loc_sp = bp_site_sp->GetOwnerAtIndex(j); 383 if (bp_loc_sp->GetBreakpoint().IsInternal()) 384 { 385 m_should_stop = true; 386 break; 387 } 388 } 389 } 390 else 391 { 392 m_should_stop = true; 393 } 394 if (log) 395 log->Printf ("StopInfoBreakpoint::PerformAction - in expression, continuing: %s.", 396 m_should_stop ? "true" : "false"); 397 process->GetTarget().GetDebugger().GetAsyncOutputStream()->Printf("Warning: hit breakpoint while " 398 "running function, skipping commands and conditions to prevent recursion."); 399 return; 400 } 401 402 StoppointCallbackContext context (event_ptr, exe_ctx, false); 403 404 // Let's copy the breakpoint locations out of the site and store them in a local list. That way if 405 // one of the breakpoint actions changes the site, then we won't be operating on a bad list. 406 407 BreakpointLocationCollection site_locations; 408 for (size_t j = 0; j < num_owners; j++) 409 site_locations.Add(bp_site_sp->GetOwnerAtIndex(j)); 410 411 for (size_t j = 0; j < num_owners; j++) 412 { 413 lldb::BreakpointLocationSP bp_loc_sp = site_locations.GetByIndex(j); 414 415 // If another action disabled this breakpoint or its location, then don't run the actions. 416 if (!bp_loc_sp->IsEnabled() || !bp_loc_sp->GetBreakpoint().IsEnabled()) 417 continue; 418 419 // The breakpoint site may have many locations associated with it, not all of them valid for 420 // this thread. Skip the ones that aren't: 421 if (!bp_loc_sp->ValidForThisThread(thread_sp.get())) 422 continue; 423 424 // First run the condition for the breakpoint. If that says we should stop, then we'll run 425 // the callback for the breakpoint. If the callback says we shouldn't stop that will win. 426 427 if (bp_loc_sp->GetConditionText() != NULL) 428 { 429 Error condition_error; 430 bool condition_says_stop = bp_loc_sp->ConditionSaysStop(exe_ctx, condition_error); 431 432 if (!condition_error.Success()) 433 { 434 Debugger &debugger = exe_ctx.GetTargetRef().GetDebugger(); 435 StreamSP error_sp = debugger.GetAsyncErrorStream (); 436 error_sp->Printf ("Stopped due to an error evaluating condition of breakpoint "); 437 bp_loc_sp->GetDescription (error_sp.get(), eDescriptionLevelBrief); 438 error_sp->Printf (": \"%s\"", 439 bp_loc_sp->GetConditionText()); 440 error_sp->EOL(); 441 const char *err_str = condition_error.AsCString("<Unknown Error>"); 442 if (log) 443 log->Printf("Error evaluating condition: \"%s\"\n", err_str); 444 445 error_sp->PutCString (err_str); 446 error_sp->EOL(); 447 error_sp->Flush(); 448 // If the condition fails to be parsed or run, we should stop. 449 condition_says_stop = true; 450 } 451 else 452 { 453 if (!condition_says_stop) 454 continue; 455 } 456 } 457 458 bool callback_says_stop; 459 460 // FIXME: For now the callbacks have to run in async mode - the first time we restart we need 461 // to get out of there. So set it here. 462 // When we figure out how to nest breakpoint hits then this will change. 463 464 Debugger &debugger = thread_sp->CalculateTarget()->GetDebugger(); 465 bool old_async = debugger.GetAsyncExecution(); 466 debugger.SetAsyncExecution (true); 467 468 callback_says_stop = bp_loc_sp->InvokeCallback (&context); 469 470 debugger.SetAsyncExecution (old_async); 471 472 if (callback_says_stop) 473 m_should_stop = true; 474 475 // If we are going to stop for this breakpoint, then remove the breakpoint. 476 if (callback_says_stop && bp_loc_sp && bp_loc_sp->GetBreakpoint().IsOneShot()) 477 { 478 thread_sp->GetProcess()->GetTarget().RemoveBreakpointByID (bp_loc_sp->GetBreakpoint().GetID()); 479 } 480 481 // Also make sure that the callback hasn't continued the target. 482 // If it did, when we'll set m_should_start to false and get out of here. 483 if (HasTargetRunSinceMe ()) 484 { 485 m_should_stop = false; 486 break; 487 } 488 } 489 } 490 // We've figured out what this stop wants to do, so mark it as valid so we don't compute it again. 491 m_should_stop_is_valid = true; 492 493 } 494 else 495 { 496 m_should_stop = true; 497 m_should_stop_is_valid = true; 498 Log * log_process(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_PROCESS)); 499 500 if (log_process) 501 log_process->Printf ("Process::%s could not find breakpoint site id: %" PRId64 "...", __FUNCTION__, m_value); 502 } 503 if (log) 504 log->Printf ("Process::%s returning from action with m_should_stop: %d.", __FUNCTION__, m_should_stop); 505 } 506 } 507 508 private: 509 std::string m_description; 510 bool m_should_stop; 511 bool m_should_stop_is_valid; 512 bool m_should_perform_action; // Since we are trying to preserve the "state" of the system even if we run functions 513 // etc. behind the users backs, we need to make sure we only REALLY perform the action once. 514 lldb::addr_t m_address; // We use this to capture the breakpoint site address when we create the StopInfo, 515 // in case somebody deletes it between the time the StopInfo is made and the 516 // description is asked for. 517 lldb::break_id_t m_break_id; 518 bool m_was_one_shot; 519 }; 520 521 522 //---------------------------------------------------------------------- 523 // StopInfoWatchpoint 524 //---------------------------------------------------------------------- 525 526 class StopInfoWatchpoint : public StopInfo 527 { 528 public: 529 // Make sure watchpoint is properly disabled and subsequently enabled while performing watchpoint actions. 530 class WatchpointSentry { 531 public: 532 WatchpointSentry(Process *p, Watchpoint *w): 533 process(p), 534 watchpoint(w) 535 { 536 if (process && watchpoint) 537 { 538 const bool notify = false; 539 watchpoint->TurnOnEphemeralMode(); 540 process->DisableWatchpoint(watchpoint, notify); 541 } 542 } 543 ~WatchpointSentry() 544 { 545 if (process && watchpoint) 546 { 547 if (!watchpoint->IsDisabledDuringEphemeralMode()) 548 { 549 const bool notify = false; 550 process->EnableWatchpoint(watchpoint, notify); 551 } 552 watchpoint->TurnOffEphemeralMode(); 553 } 554 } 555 private: 556 Process *process; 557 Watchpoint *watchpoint; 558 }; 559 560 StopInfoWatchpoint (Thread &thread, break_id_t watch_id) : 561 StopInfo(thread, watch_id), 562 m_description(), 563 m_should_stop(false), 564 m_should_stop_is_valid(false) 565 { 566 } 567 568 virtual ~StopInfoWatchpoint () 569 { 570 } 571 572 virtual StopReason 573 GetStopReason () const 574 { 575 return eStopReasonWatchpoint; 576 } 577 578 virtual const char * 579 GetDescription () 580 { 581 if (m_description.empty()) 582 { 583 StreamString strm; 584 strm.Printf("watchpoint %" PRIi64, m_value); 585 m_description.swap (strm.GetString()); 586 } 587 return m_description.c_str(); 588 } 589 590 protected: 591 virtual bool 592 ShouldStopSynchronous (Event *event_ptr) 593 { 594 // ShouldStop() method is idempotent and should not affect hit count. 595 // See Process::RunPrivateStateThread()->Process()->HandlePrivateEvent() 596 // -->Process()::ShouldBroadcastEvent()->ThreadList::ShouldStop()-> 597 // Thread::ShouldStop()->ThreadPlanBase::ShouldStop()-> 598 // StopInfoWatchpoint::ShouldStop() and 599 // Event::DoOnRemoval()->Process::ProcessEventData::DoOnRemoval()-> 600 // StopInfoWatchpoint::PerformAction(). 601 if (m_should_stop_is_valid) 602 return m_should_stop; 603 604 ThreadSP thread_sp (m_thread_wp.lock()); 605 if (thread_sp) 606 { 607 WatchpointSP wp_sp (thread_sp->CalculateTarget()->GetWatchpointList().FindByID(GetValue())); 608 if (wp_sp) 609 { 610 // Check if we should stop at a watchpoint. 611 ExecutionContext exe_ctx (thread_sp->GetStackFrameAtIndex(0)); 612 StoppointCallbackContext context (event_ptr, exe_ctx, true); 613 m_should_stop = wp_sp->ShouldStop (&context); 614 } 615 else 616 { 617 Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_PROCESS)); 618 619 if (log) 620 log->Printf ("Process::%s could not find watchpoint location id: %" PRId64 "...", 621 __FUNCTION__, GetValue()); 622 623 m_should_stop = true; 624 } 625 } 626 m_should_stop_is_valid = true; 627 return m_should_stop; 628 } 629 630 bool 631 ShouldStop (Event *event_ptr) 632 { 633 // This just reports the work done by PerformAction or the synchronous stop. It should 634 // only ever get called after they have had a chance to run. 635 assert (m_should_stop_is_valid); 636 return m_should_stop; 637 } 638 639 virtual void 640 PerformAction (Event *event_ptr) 641 { 642 Log *log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_WATCHPOINTS); 643 // We're going to calculate if we should stop or not in some way during the course of 644 // this code. Also by default we're going to stop, so set that here. 645 m_should_stop = true; 646 647 ThreadSP thread_sp (m_thread_wp.lock()); 648 if (thread_sp) 649 { 650 651 WatchpointSP wp_sp (thread_sp->CalculateTarget()->GetWatchpointList().FindByID(GetValue())); 652 if (wp_sp) 653 { 654 ExecutionContext exe_ctx (thread_sp->GetStackFrameAtIndex(0)); 655 Process* process = exe_ctx.GetProcessPtr(); 656 657 // This sentry object makes sure the current watchpoint is disabled while performing watchpoint actions, 658 // and it is then enabled after we are finished. 659 WatchpointSentry sentry(process, wp_sp.get()); 660 661 { 662 // check if this process is running on an architecture where watchpoints trigger 663 // before the associated instruction runs. if so, disable the WP, single-step and then 664 // re-enable the watchpoint 665 if (process) 666 { 667 uint32_t num; 668 bool wp_triggers_after; 669 if (process->GetWatchpointSupportInfo(num, wp_triggers_after).Success()) 670 { 671 if (!wp_triggers_after) 672 { 673 StopInfoSP stored_stop_info_sp = thread_sp->GetStopInfo(); 674 assert (stored_stop_info_sp.get() == this); 675 676 ThreadPlanSP new_plan_sp(thread_sp->QueueThreadPlanForStepSingleInstruction(false, // step-over 677 false, // abort_other_plans 678 true)); // stop_other_threads 679 new_plan_sp->SetIsMasterPlan (true); 680 new_plan_sp->SetOkayToDiscard (false); 681 new_plan_sp->SetPrivate (true); 682 process->GetThreadList().SetSelectedThreadByID (thread_sp->GetID()); 683 process->Resume (); 684 process->WaitForProcessToStop (NULL); 685 process->GetThreadList().SetSelectedThreadByID (thread_sp->GetID()); 686 thread_sp->SetStopInfo(stored_stop_info_sp); 687 } 688 } 689 } 690 } 691 692 if (m_should_stop && wp_sp->GetConditionText() != NULL) 693 { 694 // We need to make sure the user sees any parse errors in their condition, so we'll hook the 695 // constructor errors up to the debugger's Async I/O. 696 ExecutionResults result_code; 697 ValueObjectSP result_value_sp; 698 const bool unwind_on_error = true; 699 const bool ignore_breakpoints = true; 700 Error error; 701 result_code = ClangUserExpression::EvaluateWithError (exe_ctx, 702 eExecutionPolicyOnlyWhenNeeded, 703 lldb::eLanguageTypeUnknown, 704 ClangUserExpression::eResultTypeAny, 705 unwind_on_error, 706 ignore_breakpoints, 707 wp_sp->GetConditionText(), 708 NULL, 709 result_value_sp, 710 error, 711 true, 712 ClangUserExpression::kDefaultTimeout); 713 if (result_code == eExecutionCompleted) 714 { 715 if (result_value_sp) 716 { 717 Scalar scalar_value; 718 if (result_value_sp->ResolveValue (scalar_value)) 719 { 720 if (scalar_value.ULongLong(1) == 0) 721 { 722 // We have been vetoed. This takes precedence over querying 723 // the watchpoint whether it should stop (aka ignore count and 724 // friends). See also StopInfoWatchpoint::ShouldStop() as well 725 // as Process::ProcessEventData::DoOnRemoval(). 726 m_should_stop = false; 727 } 728 else 729 m_should_stop = true; 730 if (log) 731 log->Printf("Condition successfully evaluated, result is %s.\n", 732 m_should_stop ? "true" : "false"); 733 } 734 else 735 { 736 m_should_stop = true; 737 if (log) 738 log->Printf("Failed to get an integer result from the expression."); 739 } 740 } 741 } 742 else 743 { 744 Debugger &debugger = exe_ctx.GetTargetRef().GetDebugger(); 745 StreamSP error_sp = debugger.GetAsyncErrorStream (); 746 error_sp->Printf ("Stopped due to an error evaluating condition of watchpoint "); 747 wp_sp->GetDescription (error_sp.get(), eDescriptionLevelBrief); 748 error_sp->Printf (": \"%s\"", 749 wp_sp->GetConditionText()); 750 error_sp->EOL(); 751 const char *err_str = error.AsCString("<Unknown Error>"); 752 if (log) 753 log->Printf("Error evaluating condition: \"%s\"\n", err_str); 754 755 error_sp->PutCString (err_str); 756 error_sp->EOL(); 757 error_sp->Flush(); 758 // If the condition fails to be parsed or run, we should stop. 759 m_should_stop = true; 760 } 761 } 762 763 // If the condition says to stop, we run the callback to further decide whether to stop. 764 if (m_should_stop) 765 { 766 StoppointCallbackContext context (event_ptr, exe_ctx, false); 767 bool stop_requested = wp_sp->InvokeCallback (&context); 768 // Also make sure that the callback hasn't continued the target. 769 // If it did, when we'll set m_should_stop to false and get out of here. 770 if (HasTargetRunSinceMe ()) 771 m_should_stop = false; 772 773 if (m_should_stop && !stop_requested) 774 { 775 // We have been vetoed by the callback mechanism. 776 m_should_stop = false; 777 } 778 } 779 // Finally, if we are going to stop, print out the new & old values: 780 if (m_should_stop) 781 { 782 wp_sp->CaptureWatchedValue(exe_ctx); 783 784 Debugger &debugger = exe_ctx.GetTargetRef().GetDebugger(); 785 StreamSP output_sp = debugger.GetAsyncOutputStream (); 786 wp_sp->DumpSnapshots(output_sp.get()); 787 output_sp->EOL(); 788 output_sp->Flush(); 789 } 790 791 } 792 else 793 { 794 Log * log_process(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_PROCESS)); 795 796 if (log_process) 797 log_process->Printf ("Process::%s could not find watchpoint id: %" PRId64 "...", __FUNCTION__, m_value); 798 } 799 if (log) 800 log->Printf ("Process::%s returning from action with m_should_stop: %d.", __FUNCTION__, m_should_stop); 801 802 m_should_stop_is_valid = true; 803 } 804 } 805 806 private: 807 std::string m_description; 808 bool m_should_stop; 809 bool m_should_stop_is_valid; 810 }; 811 812 813 814 //---------------------------------------------------------------------- 815 // StopInfoUnixSignal 816 //---------------------------------------------------------------------- 817 818 class StopInfoUnixSignal : public StopInfo 819 { 820 public: 821 822 StopInfoUnixSignal (Thread &thread, int signo) : 823 StopInfo (thread, signo) 824 { 825 } 826 827 virtual ~StopInfoUnixSignal () 828 { 829 } 830 831 832 virtual StopReason 833 GetStopReason () const 834 { 835 return eStopReasonSignal; 836 } 837 838 virtual bool 839 ShouldStopSynchronous (Event *event_ptr) 840 { 841 ThreadSP thread_sp (m_thread_wp.lock()); 842 if (thread_sp) 843 return thread_sp->GetProcess()->GetUnixSignals().GetShouldStop (m_value); 844 return false; 845 } 846 847 virtual bool 848 ShouldStop (Event *event_ptr) 849 { 850 ThreadSP thread_sp (m_thread_wp.lock()); 851 if (thread_sp) 852 return thread_sp->GetProcess()->GetUnixSignals().GetShouldStop (m_value); 853 return false; 854 } 855 856 857 // If should stop returns false, check if we should notify of this event 858 virtual bool 859 DoShouldNotify (Event *event_ptr) 860 { 861 ThreadSP thread_sp (m_thread_wp.lock()); 862 if (thread_sp) 863 { 864 bool should_notify = thread_sp->GetProcess()->GetUnixSignals().GetShouldNotify (m_value); 865 if (should_notify) 866 { 867 StreamString strm; 868 strm.Printf ("thread %d received signal: %s", 869 thread_sp->GetIndexID(), 870 thread_sp->GetProcess()->GetUnixSignals().GetSignalAsCString (m_value)); 871 Process::ProcessEventData::AddRestartedReason(event_ptr, strm.GetData()); 872 } 873 return should_notify; 874 } 875 return true; 876 } 877 878 879 virtual void 880 WillResume (lldb::StateType resume_state) 881 { 882 ThreadSP thread_sp (m_thread_wp.lock()); 883 if (thread_sp) 884 { 885 if (thread_sp->GetProcess()->GetUnixSignals().GetShouldSuppress(m_value) == false) 886 thread_sp->SetResumeSignal(m_value); 887 } 888 } 889 890 virtual const char * 891 GetDescription () 892 { 893 if (m_description.empty()) 894 { 895 ThreadSP thread_sp (m_thread_wp.lock()); 896 if (thread_sp) 897 { 898 StreamString strm; 899 const char *signal_name = thread_sp->GetProcess()->GetUnixSignals().GetSignalAsCString (m_value); 900 if (signal_name) 901 strm.Printf("signal %s", signal_name); 902 else 903 strm.Printf("signal %" PRIi64, m_value); 904 m_description.swap (strm.GetString()); 905 } 906 } 907 return m_description.c_str(); 908 } 909 }; 910 911 //---------------------------------------------------------------------- 912 // StopInfoTrace 913 //---------------------------------------------------------------------- 914 915 class StopInfoTrace : public StopInfo 916 { 917 public: 918 919 StopInfoTrace (Thread &thread) : 920 StopInfo (thread, LLDB_INVALID_UID) 921 { 922 } 923 924 virtual ~StopInfoTrace () 925 { 926 } 927 928 virtual StopReason 929 GetStopReason () const 930 { 931 return eStopReasonTrace; 932 } 933 934 virtual const char * 935 GetDescription () 936 { 937 if (m_description.empty()) 938 return "trace"; 939 else 940 return m_description.c_str(); 941 } 942 }; 943 944 945 //---------------------------------------------------------------------- 946 // StopInfoException 947 //---------------------------------------------------------------------- 948 949 class StopInfoException : public StopInfo 950 { 951 public: 952 953 StopInfoException (Thread &thread, const char *description) : 954 StopInfo (thread, LLDB_INVALID_UID) 955 { 956 if (description) 957 SetDescription (description); 958 } 959 960 virtual 961 ~StopInfoException () 962 { 963 } 964 965 virtual StopReason 966 GetStopReason () const 967 { 968 return eStopReasonException; 969 } 970 971 virtual const char * 972 GetDescription () 973 { 974 if (m_description.empty()) 975 return "exception"; 976 else 977 return m_description.c_str(); 978 } 979 }; 980 981 982 //---------------------------------------------------------------------- 983 // StopInfoThreadPlan 984 //---------------------------------------------------------------------- 985 986 class StopInfoThreadPlan : public StopInfo 987 { 988 public: 989 990 StopInfoThreadPlan (ThreadPlanSP &plan_sp, ValueObjectSP &return_valobj_sp) : 991 StopInfo (plan_sp->GetThread(), LLDB_INVALID_UID), 992 m_plan_sp (plan_sp), 993 m_return_valobj_sp (return_valobj_sp) 994 { 995 } 996 997 virtual ~StopInfoThreadPlan () 998 { 999 } 1000 1001 virtual StopReason 1002 GetStopReason () const 1003 { 1004 return eStopReasonPlanComplete; 1005 } 1006 1007 virtual const char * 1008 GetDescription () 1009 { 1010 if (m_description.empty()) 1011 { 1012 StreamString strm; 1013 m_plan_sp->GetDescription (&strm, eDescriptionLevelBrief); 1014 m_description.swap (strm.GetString()); 1015 } 1016 return m_description.c_str(); 1017 } 1018 1019 ValueObjectSP 1020 GetReturnValueObject() 1021 { 1022 return m_return_valobj_sp; 1023 } 1024 1025 protected: 1026 virtual bool 1027 ShouldStop (Event *event_ptr) 1028 { 1029 if (m_plan_sp) 1030 return m_plan_sp->ShouldStop(event_ptr); 1031 else 1032 return StopInfo::ShouldStop(event_ptr); 1033 } 1034 1035 private: 1036 ThreadPlanSP m_plan_sp; 1037 ValueObjectSP m_return_valobj_sp; 1038 }; 1039 1040 class StopInfoExec : public StopInfo 1041 { 1042 public: 1043 1044 StopInfoExec (Thread &thread) : 1045 StopInfo (thread, LLDB_INVALID_UID), 1046 m_performed_action (false) 1047 { 1048 } 1049 1050 virtual 1051 ~StopInfoExec () 1052 { 1053 } 1054 1055 virtual StopReason 1056 GetStopReason () const 1057 { 1058 return eStopReasonExec; 1059 } 1060 1061 virtual const char * 1062 GetDescription () 1063 { 1064 return "exec"; 1065 } 1066 protected: 1067 1068 virtual void 1069 PerformAction (Event *event_ptr) 1070 { 1071 // Only perform the action once 1072 if (m_performed_action) 1073 return; 1074 m_performed_action = true; 1075 ThreadSP thread_sp (m_thread_wp.lock()); 1076 if (thread_sp) 1077 thread_sp->GetProcess()->DidExec(); 1078 } 1079 1080 bool m_performed_action; 1081 }; 1082 1083 } // namespace lldb_private 1084 1085 StopInfoSP 1086 StopInfo::CreateStopReasonWithBreakpointSiteID (Thread &thread, break_id_t break_id) 1087 { 1088 return StopInfoSP (new StopInfoBreakpoint (thread, break_id)); 1089 } 1090 1091 StopInfoSP 1092 StopInfo::CreateStopReasonWithBreakpointSiteID (Thread &thread, break_id_t break_id, bool should_stop) 1093 { 1094 return StopInfoSP (new StopInfoBreakpoint (thread, break_id, should_stop)); 1095 } 1096 1097 StopInfoSP 1098 StopInfo::CreateStopReasonWithWatchpointID (Thread &thread, break_id_t watch_id) 1099 { 1100 return StopInfoSP (new StopInfoWatchpoint (thread, watch_id)); 1101 } 1102 1103 StopInfoSP 1104 StopInfo::CreateStopReasonWithSignal (Thread &thread, int signo) 1105 { 1106 return StopInfoSP (new StopInfoUnixSignal (thread, signo)); 1107 } 1108 1109 StopInfoSP 1110 StopInfo::CreateStopReasonToTrace (Thread &thread) 1111 { 1112 return StopInfoSP (new StopInfoTrace (thread)); 1113 } 1114 1115 StopInfoSP 1116 StopInfo::CreateStopReasonWithPlan (ThreadPlanSP &plan_sp, ValueObjectSP return_valobj_sp) 1117 { 1118 return StopInfoSP (new StopInfoThreadPlan (plan_sp, return_valobj_sp)); 1119 } 1120 1121 StopInfoSP 1122 StopInfo::CreateStopReasonWithException (Thread &thread, const char *description) 1123 { 1124 return StopInfoSP (new StopInfoException (thread, description)); 1125 } 1126 1127 StopInfoSP 1128 StopInfo::CreateStopReasonWithExec (Thread &thread) 1129 { 1130 return StopInfoSP (new StopInfoExec (thread)); 1131 } 1132 1133 ValueObjectSP 1134 StopInfo::GetReturnValueObject(StopInfoSP &stop_info_sp) 1135 { 1136 if (stop_info_sp && stop_info_sp->GetStopReason() == eStopReasonPlanComplete) 1137 { 1138 StopInfoThreadPlan *plan_stop_info = static_cast<StopInfoThreadPlan *>(stop_info_sp.get()); 1139 return plan_stop_info->GetReturnValueObject(); 1140 } 1141 else 1142 return ValueObjectSP(); 1143 } 1144
