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InstrumentationRuntimeTSan.cpp
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1 //===-- InstrumentationRuntimeTSan.cpp ------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
10 
13 #include "lldb/Core/Debugger.h"
14 #include "lldb/Core/Module.h"
17 #include "lldb/Core/StreamFile.h"
18 #include "lldb/Core/ValueObject.h"
21 #include "lldb/Symbol/Symbol.h"
23 #include "lldb/Symbol/Variable.h"
27 #include "lldb/Target/StopInfo.h"
28 #include "lldb/Target/Target.h"
29 #include "lldb/Target/Thread.h"
31 #include "lldb/Utility/Stream.h"
32 
33 #include <memory>
34 
35 using namespace lldb;
36 using namespace lldb_private;
37 
39 
40 lldb::InstrumentationRuntimeSP
41 InstrumentationRuntimeTSan::CreateInstance(const lldb::ProcessSP &process_sp) {
42  return InstrumentationRuntimeSP(new InstrumentationRuntimeTSan(process_sp));
43 }
44 
45 void InstrumentationRuntimeTSan::Initialize() {
46  PluginManager::RegisterPlugin(
47  GetPluginNameStatic(), "ThreadSanitizer instrumentation runtime plugin.",
48  CreateInstance, GetTypeStatic);
49 }
50 
51 void InstrumentationRuntimeTSan::Terminate() {
52  PluginManager::UnregisterPlugin(CreateInstance);
53 }
54 
55 lldb::InstrumentationRuntimeType InstrumentationRuntimeTSan::GetTypeStatic() {
57 }
58 
59 InstrumentationRuntimeTSan::~InstrumentationRuntimeTSan() { Deactivate(); }
60 
62 extern "C"
63 {
64  void *__tsan_get_current_report();
65  int __tsan_get_report_data(void *report, const char **description, int *count,
66  int *stack_count, int *mop_count, int *loc_count,
67  int *mutex_count, int *thread_count,
68  int *unique_tid_count, void **sleep_trace,
69  unsigned long trace_size);
70  int __tsan_get_report_stack(void *report, unsigned long idx, void **trace,
71  unsigned long trace_size);
72  int __tsan_get_report_mop(void *report, unsigned long idx, int *tid, void **addr,
73  int *size, int *write, int *atomic, void **trace,
74  unsigned long trace_size);
75  int __tsan_get_report_loc(void *report, unsigned long idx, const char **type,
76  void **addr, unsigned long *start, unsigned long *size, int *tid,
77  int *fd, int *suppressable, void **trace,
78  unsigned long trace_size);
79  int __tsan_get_report_mutex(void *report, unsigned long idx, unsigned long *mutex_id, void **addr,
80  int *destroyed, void **trace, unsigned long trace_size);
81  int __tsan_get_report_thread(void *report, unsigned long idx, int *tid, unsigned long *os_id,
82  int *running, const char **name, int *parent_tid,
83  void **trace, unsigned long trace_size);
84  int __tsan_get_report_unique_tid(void *report, unsigned long idx, int *tid);
85 
86  // TODO: dlsym won't work on Windows.
87  void *dlsym(void* handle, const char* symbol);
88  int (*ptr__tsan_get_report_loc_object_type)(void *report, unsigned long idx, const char **object_type);
89 }
90 
91 const int REPORT_TRACE_SIZE = 128;
92 const int REPORT_ARRAY_SIZE = 4;
93 
94 struct data {
95  void *report;
96  const char *description;
97  int report_count;
98 
99  void *sleep_trace[REPORT_TRACE_SIZE];
100 
101  int stack_count;
102  struct {
103  int idx;
104  void *trace[REPORT_TRACE_SIZE];
105  } stacks[REPORT_ARRAY_SIZE];
106 
107  int mop_count;
108  struct {
109  int idx;
110  int tid;
111  int size;
112  int write;
113  int atomic;
114  void *addr;
115  void *trace[REPORT_TRACE_SIZE];
116  } mops[REPORT_ARRAY_SIZE];
117 
118  int loc_count;
119  struct {
120  int idx;
121  const char *type;
122  void *addr;
123  unsigned long start;
124  unsigned long size;
125  int tid;
126  int fd;
127  int suppressable;
128  void *trace[REPORT_TRACE_SIZE];
129  const char *object_type;
130  } locs[REPORT_ARRAY_SIZE];
131 
132  int mutex_count;
133  struct {
134  int idx;
135  unsigned long mutex_id;
136  void *addr;
137  int destroyed;
138  void *trace[REPORT_TRACE_SIZE];
139  } mutexes[REPORT_ARRAY_SIZE];
140 
141  int thread_count;
142  struct {
143  int idx;
144  int tid;
145  unsigned long os_id;
146  int running;
147  const char *name;
148  int parent_tid;
149  void *trace[REPORT_TRACE_SIZE];
150  } threads[REPORT_ARRAY_SIZE];
151 
152  int unique_tid_count;
153  struct {
154  int idx;
155  int tid;
156  } unique_tids[REPORT_ARRAY_SIZE];
157 };
158 )";
159 
161 data t = {0};
162 
163 ptr__tsan_get_report_loc_object_type = (typeof(ptr__tsan_get_report_loc_object_type))(void *)dlsym((void*)-2 /*RTLD_DEFAULT*/, "__tsan_get_report_loc_object_type");
164 
165 t.report = __tsan_get_current_report();
166 __tsan_get_report_data(t.report, &t.description, &t.report_count, &t.stack_count, &t.mop_count, &t.loc_count, &t.mutex_count, &t.thread_count, &t.unique_tid_count, t.sleep_trace, REPORT_TRACE_SIZE);
167 
168 if (t.stack_count > REPORT_ARRAY_SIZE) t.stack_count = REPORT_ARRAY_SIZE;
169 for (int i = 0; i < t.stack_count; i++) {
170  t.stacks[i].idx = i;
171  __tsan_get_report_stack(t.report, i, t.stacks[i].trace, REPORT_TRACE_SIZE);
172 }
173 
174 if (t.mop_count > REPORT_ARRAY_SIZE) t.mop_count = REPORT_ARRAY_SIZE;
175 for (int i = 0; i < t.mop_count; i++) {
176  t.mops[i].idx = i;
177  __tsan_get_report_mop(t.report, i, &t.mops[i].tid, &t.mops[i].addr, &t.mops[i].size, &t.mops[i].write, &t.mops[i].atomic, t.mops[i].trace, REPORT_TRACE_SIZE);
178 }
179 
180 if (t.loc_count > REPORT_ARRAY_SIZE) t.loc_count = REPORT_ARRAY_SIZE;
181 for (int i = 0; i < t.loc_count; i++) {
182  t.locs[i].idx = i;
183  __tsan_get_report_loc(t.report, i, &t.locs[i].type, &t.locs[i].addr, &t.locs[i].start, &t.locs[i].size, &t.locs[i].tid, &t.locs[i].fd, &t.locs[i].suppressable, t.locs[i].trace, REPORT_TRACE_SIZE);
184  if (ptr__tsan_get_report_loc_object_type)
185  ptr__tsan_get_report_loc_object_type(t.report, i, &t.locs[i].object_type);
186 }
187 
188 if (t.mutex_count > REPORT_ARRAY_SIZE) t.mutex_count = REPORT_ARRAY_SIZE;
189 for (int i = 0; i < t.mutex_count; i++) {
190  t.mutexes[i].idx = i;
191  __tsan_get_report_mutex(t.report, i, &t.mutexes[i].mutex_id, &t.mutexes[i].addr, &t.mutexes[i].destroyed, t.mutexes[i].trace, REPORT_TRACE_SIZE);
192 }
193 
194 if (t.thread_count > REPORT_ARRAY_SIZE) t.thread_count = REPORT_ARRAY_SIZE;
195 for (int i = 0; i < t.thread_count; i++) {
196  t.threads[i].idx = i;
197  __tsan_get_report_thread(t.report, i, &t.threads[i].tid, &t.threads[i].os_id, &t.threads[i].running, &t.threads[i].name, &t.threads[i].parent_tid, t.threads[i].trace, REPORT_TRACE_SIZE);
198 }
199 
200 if (t.unique_tid_count > REPORT_ARRAY_SIZE) t.unique_tid_count = REPORT_ARRAY_SIZE;
201 for (int i = 0; i < t.unique_tid_count; i++) {
202  t.unique_tids[i].idx = i;
203  __tsan_get_report_unique_tid(t.report, i, &t.unique_tids[i].tid);
204 }
205 
206 t;
207 )";
208 
210 CreateStackTrace(ValueObjectSP o,
211  const std::string &trace_item_name = ".trace") {
212  auto trace_sp = std::make_shared<StructuredData::Array>();
213  ValueObjectSP trace_value_object =
214  o->GetValueForExpressionPath(trace_item_name.c_str());
215  size_t count = trace_value_object->GetNumChildren();
216  for (size_t j = 0; j < count; j++) {
217  addr_t trace_addr =
218  trace_value_object->GetChildAtIndex(j, true)->GetValueAsUnsigned(0);
219  if (trace_addr == 0)
220  break;
221  trace_sp->AddItem(std::make_shared<StructuredData::Integer>(trace_addr));
222  }
223  return trace_sp;
224 }
225 
227  ValueObjectSP return_value_sp, const std::string &items_name,
228  const std::string &count_name,
229  std::function<void(const ValueObjectSP &o,
230  const StructuredData::DictionarySP &dict)> const
231  &callback) {
232  auto array_sp = std::make_shared<StructuredData::Array>();
233  unsigned int count =
234  return_value_sp->GetValueForExpressionPath(count_name.c_str())
235  ->GetValueAsUnsigned(0);
236  ValueObjectSP objects =
237  return_value_sp->GetValueForExpressionPath(items_name.c_str());
238  for (unsigned int i = 0; i < count; i++) {
239  ValueObjectSP o = objects->GetChildAtIndex(i, true);
240  auto dict_sp = std::make_shared<StructuredData::Dictionary>();
241 
242  callback(o, dict_sp);
243 
244  array_sp->AddItem(dict_sp);
245  }
246  return array_sp;
247 }
248 
249 static std::string RetrieveString(ValueObjectSP return_value_sp,
250  ProcessSP process_sp,
251  const std::string &expression_path) {
252  addr_t ptr =
253  return_value_sp->GetValueForExpressionPath(expression_path.c_str())
254  ->GetValueAsUnsigned(0);
255  std::string str;
256  Status error;
257  process_sp->ReadCStringFromMemory(ptr, str, error);
258  return str;
259 }
260 
261 static void
262 GetRenumberedThreadIds(ProcessSP process_sp, ValueObjectSP data,
263  std::map<uint64_t, user_id_t> &thread_id_map) {
265  data, ".threads", ".thread_count",
266  [process_sp, &thread_id_map](const ValueObjectSP &o,
267  const StructuredData::DictionarySP &dict) {
268  uint64_t thread_id =
269  o->GetValueForExpressionPath(".tid")->GetValueAsUnsigned(0);
270  uint64_t thread_os_id =
271  o->GetValueForExpressionPath(".os_id")->GetValueAsUnsigned(0);
272  user_id_t lldb_user_id = 0;
273 
274  bool can_update = true;
275  ThreadSP lldb_thread = process_sp->GetThreadList().FindThreadByID(
276  thread_os_id, can_update);
277  if (lldb_thread) {
278  lldb_user_id = lldb_thread->GetIndexID();
279  } else {
280  // This isn't a live thread anymore. Ask process to assign a new
281  // Index ID (or return an old one if we've already seen this
282  // thread_os_id). It will also make sure that no new threads are
283  // assigned this Index ID.
284  lldb_user_id = process_sp->AssignIndexIDToThread(thread_os_id);
285  }
286 
287  thread_id_map[thread_id] = lldb_user_id;
288  });
289 }
290 
291 static user_id_t Renumber(uint64_t id,
292  std::map<uint64_t, user_id_t> &thread_id_map) {
293  auto IT = thread_id_map.find(id);
294  if (IT == thread_id_map.end())
295  return 0;
296 
297  return IT->second;
298 }
299 
300 StructuredData::ObjectSP InstrumentationRuntimeTSan::RetrieveReportData(
301  ExecutionContextRef exe_ctx_ref) {
302  ProcessSP process_sp = GetProcessSP();
303  if (!process_sp)
304  return StructuredData::ObjectSP();
305 
306  ThreadSP thread_sp = exe_ctx_ref.GetThreadSP();
307  StackFrameSP frame_sp = thread_sp->GetSelectedFrame();
308 
309  if (!frame_sp)
310  return StructuredData::ObjectSP();
311 
313  options.SetUnwindOnError(true);
314  options.SetTryAllThreads(true);
315  options.SetStopOthers(true);
316  options.SetIgnoreBreakpoints(true);
317  options.SetTimeout(process_sp->GetUtilityExpressionTimeout());
319  options.SetAutoApplyFixIts(false);
321 
322  ValueObjectSP main_value;
323  ExecutionContext exe_ctx;
324  Status eval_error;
325  frame_sp->CalculateExecutionContext(exe_ctx);
326  ExpressionResults result = UserExpression::Evaluate(
327  exe_ctx, options, thread_sanitizer_retrieve_report_data_command, "",
328  main_value, eval_error);
329  if (result != eExpressionCompleted) {
330  StreamString ss;
331  ss << "cannot evaluate ThreadSanitizer expression:\n";
332  ss << eval_error.AsCString();
333  Debugger::ReportWarning(ss.GetString().str(),
334  process_sp->GetTarget().GetDebugger().GetID());
335  return StructuredData::ObjectSP();
336  }
337 
338  std::map<uint64_t, user_id_t> thread_id_map;
339  GetRenumberedThreadIds(process_sp, main_value, thread_id_map);
340 
341  auto dict = std::make_shared<StructuredData::Dictionary>();
342  dict->AddStringItem("instrumentation_class", "ThreadSanitizer");
343  dict->AddStringItem("issue_type",
344  RetrieveString(main_value, process_sp, ".description"));
345  dict->AddIntegerItem("report_count",
346  main_value->GetValueForExpressionPath(".report_count")
347  ->GetValueAsUnsigned(0));
348  dict->AddItem("sleep_trace", CreateStackTrace(
349  main_value, ".sleep_trace"));
350 
352  main_value, ".stacks", ".stack_count",
353  [thread_sp](const ValueObjectSP &o,
354  const StructuredData::DictionarySP &dict) {
355  dict->AddIntegerItem(
356  "index",
357  o->GetValueForExpressionPath(".idx")->GetValueAsUnsigned(0));
358  dict->AddItem("trace", CreateStackTrace(o));
359  // "stacks" happen on the current thread
360  dict->AddIntegerItem("thread_id", thread_sp->GetIndexID());
361  });
362  dict->AddItem("stacks", stacks);
363 
365  main_value, ".mops", ".mop_count",
366  [&thread_id_map](const ValueObjectSP &o,
367  const StructuredData::DictionarySP &dict) {
368  dict->AddIntegerItem(
369  "index",
370  o->GetValueForExpressionPath(".idx")->GetValueAsUnsigned(0));
371  dict->AddIntegerItem(
372  "thread_id",
373  Renumber(
374  o->GetValueForExpressionPath(".tid")->GetValueAsUnsigned(0),
375  thread_id_map));
376  dict->AddIntegerItem(
377  "size",
378  o->GetValueForExpressionPath(".size")->GetValueAsUnsigned(0));
379  dict->AddBooleanItem(
380  "is_write",
381  o->GetValueForExpressionPath(".write")->GetValueAsUnsigned(0));
382  dict->AddBooleanItem(
383  "is_atomic",
384  o->GetValueForExpressionPath(".atomic")->GetValueAsUnsigned(0));
385  dict->AddIntegerItem(
386  "address",
387  o->GetValueForExpressionPath(".addr")->GetValueAsUnsigned(0));
388  dict->AddItem("trace", CreateStackTrace(o));
389  });
390  dict->AddItem("mops", mops);
391 
393  main_value, ".locs", ".loc_count",
394  [process_sp, &thread_id_map](const ValueObjectSP &o,
395  const StructuredData::DictionarySP &dict) {
396  dict->AddIntegerItem(
397  "index",
398  o->GetValueForExpressionPath(".idx")->GetValueAsUnsigned(0));
399  dict->AddStringItem("type", RetrieveString(o, process_sp, ".type"));
400  dict->AddIntegerItem(
401  "address",
402  o->GetValueForExpressionPath(".addr")->GetValueAsUnsigned(0));
403  dict->AddIntegerItem(
404  "start",
405  o->GetValueForExpressionPath(".start")->GetValueAsUnsigned(0));
406  dict->AddIntegerItem(
407  "size",
408  o->GetValueForExpressionPath(".size")->GetValueAsUnsigned(0));
409  dict->AddIntegerItem(
410  "thread_id",
411  Renumber(
412  o->GetValueForExpressionPath(".tid")->GetValueAsUnsigned(0),
413  thread_id_map));
414  dict->AddIntegerItem(
415  "file_descriptor",
416  o->GetValueForExpressionPath(".fd")->GetValueAsUnsigned(0));
417  dict->AddIntegerItem("suppressable",
418  o->GetValueForExpressionPath(".suppressable")
419  ->GetValueAsUnsigned(0));
420  dict->AddItem("trace", CreateStackTrace(o));
421  dict->AddStringItem("object_type",
422  RetrieveString(o, process_sp, ".object_type"));
423  });
424  dict->AddItem("locs", locs);
425 
427  main_value, ".mutexes", ".mutex_count",
428  [](const ValueObjectSP &o, const StructuredData::DictionarySP &dict) {
429  dict->AddIntegerItem(
430  "index",
431  o->GetValueForExpressionPath(".idx")->GetValueAsUnsigned(0));
432  dict->AddIntegerItem(
433  "mutex_id",
434  o->GetValueForExpressionPath(".mutex_id")->GetValueAsUnsigned(0));
435  dict->AddIntegerItem(
436  "address",
437  o->GetValueForExpressionPath(".addr")->GetValueAsUnsigned(0));
438  dict->AddIntegerItem(
439  "destroyed",
440  o->GetValueForExpressionPath(".destroyed")->GetValueAsUnsigned(0));
441  dict->AddItem("trace", CreateStackTrace(o));
442  });
443  dict->AddItem("mutexes", mutexes);
444 
446  main_value, ".threads", ".thread_count",
447  [process_sp, &thread_id_map](const ValueObjectSP &o,
448  const StructuredData::DictionarySP &dict) {
449  dict->AddIntegerItem(
450  "index",
451  o->GetValueForExpressionPath(".idx")->GetValueAsUnsigned(0));
452  dict->AddIntegerItem(
453  "thread_id",
454  Renumber(
455  o->GetValueForExpressionPath(".tid")->GetValueAsUnsigned(0),
456  thread_id_map));
457  dict->AddIntegerItem(
458  "thread_os_id",
459  o->GetValueForExpressionPath(".os_id")->GetValueAsUnsigned(0));
460  dict->AddIntegerItem(
461  "running",
462  o->GetValueForExpressionPath(".running")->GetValueAsUnsigned(0));
463  dict->AddStringItem("name", RetrieveString(o, process_sp, ".name"));
464  dict->AddIntegerItem(
465  "parent_thread_id",
466  Renumber(o->GetValueForExpressionPath(".parent_tid")
467  ->GetValueAsUnsigned(0),
468  thread_id_map));
469  dict->AddItem("trace", CreateStackTrace(o));
470  });
471  dict->AddItem("threads", threads);
472 
474  main_value, ".unique_tids", ".unique_tid_count",
475  [&thread_id_map](const ValueObjectSP &o,
476  const StructuredData::DictionarySP &dict) {
477  dict->AddIntegerItem(
478  "index",
479  o->GetValueForExpressionPath(".idx")->GetValueAsUnsigned(0));
480  dict->AddIntegerItem(
481  "tid",
482  Renumber(
483  o->GetValueForExpressionPath(".tid")->GetValueAsUnsigned(0),
484  thread_id_map));
485  });
486  dict->AddItem("unique_tids", unique_tids);
487 
488  return dict;
489 }
490 
492 InstrumentationRuntimeTSan::FormatDescription(StructuredData::ObjectSP report) {
493  std::string description = std::string(report->GetAsDictionary()
494  ->GetValueForKey("issue_type")
495  ->GetAsString()
496  ->GetValue());
497 
498  if (description == "data-race") {
499  return "Data race";
500  } else if (description == "data-race-vptr") {
501  return "Data race on C++ virtual pointer";
502  } else if (description == "heap-use-after-free") {
503  return "Use of deallocated memory";
504  } else if (description == "heap-use-after-free-vptr") {
505  return "Use of deallocated C++ virtual pointer";
506  } else if (description == "thread-leak") {
507  return "Thread leak";
508  } else if (description == "locked-mutex-destroy") {
509  return "Destruction of a locked mutex";
510  } else if (description == "mutex-double-lock") {
511  return "Double lock of a mutex";
512  } else if (description == "mutex-invalid-access") {
513  return "Use of an uninitialized or destroyed mutex";
514  } else if (description == "mutex-bad-unlock") {
515  return "Unlock of an unlocked mutex (or by a wrong thread)";
516  } else if (description == "mutex-bad-read-lock") {
517  return "Read lock of a write locked mutex";
518  } else if (description == "mutex-bad-read-unlock") {
519  return "Read unlock of a write locked mutex";
520  } else if (description == "signal-unsafe-call") {
521  return "Signal-unsafe call inside a signal handler";
522  } else if (description == "errno-in-signal-handler") {
523  return "Overwrite of errno in a signal handler";
524  } else if (description == "lock-order-inversion") {
525  return "Lock order inversion (potential deadlock)";
526  } else if (description == "external-race") {
527  return "Race on a library object";
528  } else if (description == "swift-access-race") {
529  return "Swift access race";
530  }
531 
532  // for unknown report codes just show the code
533  return description;
534 }
535 
536 static std::string Sprintf(const char *format, ...) {
537  StreamString s;
538  va_list args;
539  va_start(args, format);
540  s.PrintfVarArg(format, args);
541  va_end(args);
542  return std::string(s.GetString());
543 }
544 
545 static std::string GetSymbolNameFromAddress(ProcessSP process_sp, addr_t addr) {
546  lldb_private::Address so_addr;
547  if (!process_sp->GetTarget().GetSectionLoadList().ResolveLoadAddress(addr,
548  so_addr))
549  return "";
550 
552  if (!symbol)
553  return "";
554 
555  std::string sym_name = symbol->GetName().GetCString();
556  return sym_name;
557 }
558 
559 static void GetSymbolDeclarationFromAddress(ProcessSP process_sp, addr_t addr,
560  Declaration &decl) {
561  lldb_private::Address so_addr;
562  if (!process_sp->GetTarget().GetSectionLoadList().ResolveLoadAddress(addr,
563  so_addr))
564  return;
565 
567  if (!symbol)
568  return;
569 
570  ConstString sym_name = symbol->GetMangled().GetName(Mangled::ePreferMangled);
571 
572  ModuleSP module = symbol->CalculateSymbolContextModule();
573  if (!module)
574  return;
575 
576  VariableList var_list;
577  module->FindGlobalVariables(sym_name, CompilerDeclContext(), 1U, var_list);
578  if (var_list.GetSize() < 1)
579  return;
580 
581  VariableSP var = var_list.GetVariableAtIndex(0);
582  decl = var->GetDeclaration();
583 }
584 
585 addr_t InstrumentationRuntimeTSan::GetFirstNonInternalFramePc(
586  StructuredData::ObjectSP trace, bool skip_one_frame) {
587  ProcessSP process_sp = GetProcessSP();
588  ModuleSP runtime_module_sp = GetRuntimeModuleSP();
589 
590  StructuredData::Array *trace_array = trace->GetAsArray();
591  for (size_t i = 0; i < trace_array->GetSize(); i++) {
592  if (skip_one_frame && i == 0)
593  continue;
594 
595  addr_t addr;
596  if (!trace_array->GetItemAtIndexAsInteger(i, addr))
597  continue;
598 
599  lldb_private::Address so_addr;
600  if (!process_sp->GetTarget().GetSectionLoadList().ResolveLoadAddress(
601  addr, so_addr))
602  continue;
603 
604  if (so_addr.GetModule() == runtime_module_sp)
605  continue;
606 
607  return addr;
608  }
609 
610  return 0;
611 }
612 
614 InstrumentationRuntimeTSan::GenerateSummary(StructuredData::ObjectSP report) {
615  ProcessSP process_sp = GetProcessSP();
616 
617  std::string summary = std::string(report->GetAsDictionary()
618  ->GetValueForKey("description")
619  ->GetAsString()
620  ->GetValue());
621  bool skip_one_frame =
622  report->GetObjectForDotSeparatedPath("issue_type")->GetStringValue() ==
623  "external-race";
624 
625  addr_t pc = 0;
626  if (report->GetAsDictionary()
627  ->GetValueForKey("mops")
628  ->GetAsArray()
629  ->GetSize() > 0)
630  pc = GetFirstNonInternalFramePc(report->GetAsDictionary()
631  ->GetValueForKey("mops")
632  ->GetAsArray()
633  ->GetItemAtIndex(0)
634  ->GetAsDictionary()
635  ->GetValueForKey("trace"),
636  skip_one_frame);
637 
638  if (report->GetAsDictionary()
639  ->GetValueForKey("stacks")
640  ->GetAsArray()
641  ->GetSize() > 0)
642  pc = GetFirstNonInternalFramePc(report->GetAsDictionary()
643  ->GetValueForKey("stacks")
644  ->GetAsArray()
645  ->GetItemAtIndex(0)
646  ->GetAsDictionary()
647  ->GetValueForKey("trace"),
648  skip_one_frame);
649 
650  if (pc != 0) {
651  summary = summary + " in " + GetSymbolNameFromAddress(process_sp, pc);
652  }
653 
654  if (report->GetAsDictionary()
655  ->GetValueForKey("locs")
656  ->GetAsArray()
657  ->GetSize() > 0) {
658  StructuredData::ObjectSP loc = report->GetAsDictionary()
659  ->GetValueForKey("locs")
660  ->GetAsArray()
661  ->GetItemAtIndex(0);
662  std::string object_type = std::string(loc->GetAsDictionary()
663  ->GetValueForKey("object_type")
664  ->GetAsString()
665  ->GetValue());
666  if (!object_type.empty()) {
667  summary = "Race on " + object_type + " object";
668  }
669  addr_t addr = loc->GetAsDictionary()
670  ->GetValueForKey("address")
671  ->GetAsInteger()
672  ->GetValue();
673  if (addr == 0)
674  addr = loc->GetAsDictionary()
675  ->GetValueForKey("start")
676  ->GetAsInteger()
677  ->GetValue();
678 
679  if (addr != 0) {
680  std::string global_name = GetSymbolNameFromAddress(process_sp, addr);
681  if (!global_name.empty()) {
682  summary = summary + " at " + global_name;
683  } else {
684  summary = summary + " at " + Sprintf("0x%llx", addr);
685  }
686  } else {
687  int fd = loc->GetAsDictionary()
688  ->GetValueForKey("file_descriptor")
689  ->GetAsInteger()
690  ->GetValue();
691  if (fd != 0) {
692  summary = summary + " on file descriptor " + Sprintf("%d", fd);
693  }
694  }
695  }
696 
697  return summary;
698 }
699 
700 addr_t InstrumentationRuntimeTSan::GetMainRacyAddress(
701  StructuredData::ObjectSP report) {
702  addr_t result = (addr_t)-1;
703 
704  report->GetObjectForDotSeparatedPath("mops")->GetAsArray()->ForEach(
705  [&result](StructuredData::Object *o) -> bool {
706  addr_t addr =
707  o->GetObjectForDotSeparatedPath("address")->GetIntegerValue();
708  if (addr < result)
709  result = addr;
710  return true;
711  });
712 
713  return (result == (addr_t)-1) ? 0 : result;
714 }
715 
716 std::string InstrumentationRuntimeTSan::GetLocationDescription(
717  StructuredData::ObjectSP report, addr_t &global_addr,
718  std::string &global_name, std::string &filename, uint32_t &line) {
719  std::string result;
720 
721  ProcessSP process_sp = GetProcessSP();
722 
723  if (report->GetAsDictionary()
724  ->GetValueForKey("locs")
725  ->GetAsArray()
726  ->GetSize() > 0) {
727  StructuredData::ObjectSP loc = report->GetAsDictionary()
728  ->GetValueForKey("locs")
729  ->GetAsArray()
730  ->GetItemAtIndex(0);
731  std::string type = std::string(
732  loc->GetAsDictionary()->GetValueForKey("type")->GetStringValue());
733  if (type == "global") {
734  global_addr = loc->GetAsDictionary()
735  ->GetValueForKey("address")
736  ->GetAsInteger()
737  ->GetValue();
738  global_name = GetSymbolNameFromAddress(process_sp, global_addr);
739  if (!global_name.empty()) {
740  result = Sprintf("'%s' is a global variable (0x%llx)",
741  global_name.c_str(), global_addr);
742  } else {
743  result = Sprintf("0x%llx is a global variable", global_addr);
744  }
745 
746  Declaration decl;
747  GetSymbolDeclarationFromAddress(process_sp, global_addr, decl);
748  if (decl.GetFile()) {
749  filename = decl.GetFile().GetPath();
750  line = decl.GetLine();
751  }
752  } else if (type == "heap") {
753  addr_t addr = loc->GetAsDictionary()
754  ->GetValueForKey("start")
755  ->GetAsInteger()
756  ->GetValue();
757  long size = loc->GetAsDictionary()
758  ->GetValueForKey("size")
759  ->GetAsInteger()
760  ->GetValue();
761  std::string object_type = std::string(loc->GetAsDictionary()
762  ->GetValueForKey("object_type")
763  ->GetAsString()
764  ->GetValue());
765  if (!object_type.empty()) {
766  result = Sprintf("Location is a %ld-byte %s object at 0x%llx", size,
767  object_type.c_str(), addr);
768  } else {
769  result =
770  Sprintf("Location is a %ld-byte heap object at 0x%llx", size, addr);
771  }
772  } else if (type == "stack") {
773  int tid = loc->GetAsDictionary()
774  ->GetValueForKey("thread_id")
775  ->GetAsInteger()
776  ->GetValue();
777  result = Sprintf("Location is stack of thread %d", tid);
778  } else if (type == "tls") {
779  int tid = loc->GetAsDictionary()
780  ->GetValueForKey("thread_id")
781  ->GetAsInteger()
782  ->GetValue();
783  result = Sprintf("Location is TLS of thread %d", tid);
784  } else if (type == "fd") {
785  int fd = loc->GetAsDictionary()
786  ->GetValueForKey("file_descriptor")
787  ->GetAsInteger()
788  ->GetValue();
789  result = Sprintf("Location is file descriptor %d", fd);
790  }
791  }
792 
793  return result;
794 }
795 
796 bool InstrumentationRuntimeTSan::NotifyBreakpointHit(
797  void *baton, StoppointCallbackContext *context, user_id_t break_id,
798  user_id_t break_loc_id) {
799  assert(baton && "null baton");
800  if (!baton)
801  return false;
802 
803  InstrumentationRuntimeTSan *const instance =
804  static_cast<InstrumentationRuntimeTSan *>(baton);
805 
806  ProcessSP process_sp = instance->GetProcessSP();
807 
808  if (process_sp->GetModIDRef().IsLastResumeForUserExpression())
809  return false;
810 
811  StructuredData::ObjectSP report =
812  instance->RetrieveReportData(context->exe_ctx_ref);
813  std::string stop_reason_description =
814  "unknown thread sanitizer fault (unable to extract thread sanitizer "
815  "report)";
816  if (report) {
817  std::string issue_description = instance->FormatDescription(report);
818  report->GetAsDictionary()->AddStringItem("description", issue_description);
819  stop_reason_description = issue_description + " detected";
820  report->GetAsDictionary()->AddStringItem("stop_description",
821  stop_reason_description);
822  std::string summary = instance->GenerateSummary(report);
823  report->GetAsDictionary()->AddStringItem("summary", summary);
824  addr_t main_address = instance->GetMainRacyAddress(report);
825  report->GetAsDictionary()->AddIntegerItem("memory_address", main_address);
826 
827  addr_t global_addr = 0;
828  std::string global_name;
829  std::string location_filename;
830  uint32_t location_line = 0;
831  std::string location_description = instance->GetLocationDescription(
832  report, global_addr, global_name, location_filename, location_line);
833  report->GetAsDictionary()->AddStringItem("location_description",
834  location_description);
835  if (global_addr != 0) {
836  report->GetAsDictionary()->AddIntegerItem("global_address", global_addr);
837  }
838  if (!global_name.empty()) {
839  report->GetAsDictionary()->AddStringItem("global_name", global_name);
840  }
841  if (location_filename != "") {
842  report->GetAsDictionary()->AddStringItem("location_filename",
843  location_filename);
844  report->GetAsDictionary()->AddIntegerItem("location_line", location_line);
845  }
846 
847  bool all_addresses_are_same = true;
848  report->GetObjectForDotSeparatedPath("mops")->GetAsArray()->ForEach(
849  [&all_addresses_are_same,
850  main_address](StructuredData::Object *o) -> bool {
851  addr_t addr =
852  o->GetObjectForDotSeparatedPath("address")->GetIntegerValue();
853  if (main_address != addr)
854  all_addresses_are_same = false;
855  return true;
856  });
857  report->GetAsDictionary()->AddBooleanItem("all_addresses_are_same",
858  all_addresses_are_same);
859  }
860 
861  // Make sure this is the right process
862  if (process_sp && process_sp == context->exe_ctx_ref.GetProcessSP()) {
863  ThreadSP thread_sp = context->exe_ctx_ref.GetThreadSP();
864  if (thread_sp)
865  thread_sp->SetStopInfo(
867  CreateStopReasonWithInstrumentationData(
868  *thread_sp, stop_reason_description, report));
869 
870  StreamFile &s = process_sp->GetTarget().GetDebugger().GetOutputStream();
871  s.Printf("ThreadSanitizer report breakpoint hit. Use 'thread "
872  "info -s' to get extended information about the "
873  "report.\n");
874 
875  return true; // Return true to stop the target
876  } else
877  return false; // Let target run
878 }
879 
880 const RegularExpression &
881 InstrumentationRuntimeTSan::GetPatternForRuntimeLibrary() {
882  static RegularExpression regex(llvm::StringRef("libclang_rt.tsan_"));
883  return regex;
884 }
885 
886 bool InstrumentationRuntimeTSan::CheckIfRuntimeIsValid(
887  const lldb::ModuleSP module_sp) {
888  static ConstString g_tsan_get_current_report("__tsan_get_current_report");
889  const Symbol *symbol = module_sp->FindFirstSymbolWithNameAndType(
890  g_tsan_get_current_report, lldb::eSymbolTypeAny);
891  return symbol != nullptr;
892 }
893 
894 void InstrumentationRuntimeTSan::Activate() {
895  if (IsActive())
896  return;
897 
898  ProcessSP process_sp = GetProcessSP();
899  if (!process_sp)
900  return;
901 
902  ConstString symbol_name("__tsan_on_report");
903  const Symbol *symbol = GetRuntimeModuleSP()->FindFirstSymbolWithNameAndType(
904  symbol_name, eSymbolTypeCode);
905 
906  if (symbol == nullptr)
907  return;
908 
909  if (!symbol->ValueIsAddress() || !symbol->GetAddressRef().IsValid())
910  return;
911 
912  Target &target = process_sp->GetTarget();
913  addr_t symbol_address = symbol->GetAddressRef().GetOpcodeLoadAddress(&target);
914 
915  if (symbol_address == LLDB_INVALID_ADDRESS)
916  return;
917 
918  const bool internal = true;
919  const bool hardware = false;
920  const bool sync = false;
921  Breakpoint *breakpoint =
922  process_sp->GetTarget()
923  .CreateBreakpoint(symbol_address, internal, hardware)
924  .get();
925  breakpoint->SetCallback(InstrumentationRuntimeTSan::NotifyBreakpointHit, this,
926  sync);
927  breakpoint->SetBreakpointKind("thread-sanitizer-report");
928  SetBreakpointID(breakpoint->GetID());
929 
930  SetActive(true);
931 }
932 
933 void InstrumentationRuntimeTSan::Deactivate() {
934  if (GetBreakpointID() != LLDB_INVALID_BREAK_ID) {
935  ProcessSP process_sp = GetProcessSP();
936  if (process_sp) {
937  process_sp->GetTarget().RemoveBreakpointByID(GetBreakpointID());
938  SetBreakpointID(LLDB_INVALID_BREAK_ID);
939  }
940  }
941  SetActive(false);
942 }
945  StructuredData::ObjectSP main_info) {
946  std::string result = "additional information";
947 
948  if (path == "mops") {
949  int size = o->GetObjectForDotSeparatedPath("size")->GetIntegerValue();
950  int thread_id =
951  o->GetObjectForDotSeparatedPath("thread_id")->GetIntegerValue();
952  bool is_write =
953  o->GetObjectForDotSeparatedPath("is_write")->GetBooleanValue();
954  bool is_atomic =
955  o->GetObjectForDotSeparatedPath("is_atomic")->GetBooleanValue();
956  addr_t addr = o->GetObjectForDotSeparatedPath("address")->GetIntegerValue();
957 
958  std::string addr_string = Sprintf(" at 0x%llx", addr);
959 
960  if (main_info->GetObjectForDotSeparatedPath("all_addresses_are_same")
961  ->GetBooleanValue()) {
962  addr_string = "";
963  }
964 
965  if (main_info->GetObjectForDotSeparatedPath("issue_type")
966  ->GetStringValue() == "external-race") {
967  result = Sprintf("%s access by thread %d",
968  is_write ? "mutating" : "read-only", thread_id);
969  } else if (main_info->GetObjectForDotSeparatedPath("issue_type")
970  ->GetStringValue() == "swift-access-race") {
971  result = Sprintf("modifying access by thread %d", thread_id);
972  } else {
973  result = Sprintf("%s%s of size %d%s by thread %d",
974  is_atomic ? "atomic " : "", is_write ? "write" : "read",
975  size, addr_string.c_str(), thread_id);
976  }
977  }
978 
979  if (path == "threads") {
980  int thread_id =
981  o->GetObjectForDotSeparatedPath("thread_id")->GetIntegerValue();
982  result = Sprintf("Thread %d created", thread_id);
983  }
984 
985  if (path == "locs") {
986  std::string type = std::string(
987  o->GetAsDictionary()->GetValueForKey("type")->GetStringValue());
988  int thread_id =
989  o->GetObjectForDotSeparatedPath("thread_id")->GetIntegerValue();
990  int fd =
991  o->GetObjectForDotSeparatedPath("file_descriptor")->GetIntegerValue();
992  if (type == "heap") {
993  result = Sprintf("Heap block allocated by thread %d", thread_id);
994  } else if (type == "fd") {
995  result =
996  Sprintf("File descriptor %d created by thread %t", fd, thread_id);
997  }
998  }
999 
1000  if (path == "mutexes") {
1001  int mutex_id =
1002  o->GetObjectForDotSeparatedPath("mutex_id")->GetIntegerValue();
1003 
1004  result = Sprintf("Mutex M%d created", mutex_id);
1005  }
1006 
1007  if (path == "stacks") {
1008  int thread_id =
1009  o->GetObjectForDotSeparatedPath("thread_id")->GetIntegerValue();
1010  result = Sprintf("Thread %d", thread_id);
1011  }
1012 
1013  result[0] = toupper(result[0]);
1014 
1015  return result;
1016 }
1017 
1018 static void AddThreadsForPath(const std::string &path,
1019  ThreadCollectionSP threads, ProcessSP process_sp,
1020  StructuredData::ObjectSP info) {
1021  info->GetObjectForDotSeparatedPath(path)->GetAsArray()->ForEach(
1022  [process_sp, threads, path, info](StructuredData::Object *o) -> bool {
1023  std::vector<lldb::addr_t> pcs;
1024  o->GetObjectForDotSeparatedPath("trace")->GetAsArray()->ForEach(
1025  [&pcs](StructuredData::Object *pc) -> bool {
1026  pcs.push_back(pc->GetAsInteger()->GetValue());
1027  return true;
1028  });
1029 
1030  if (pcs.size() == 0)
1031  return true;
1032 
1033  StructuredData::ObjectSP thread_id_obj =
1034  o->GetObjectForDotSeparatedPath("thread_os_id");
1035  tid_t tid = thread_id_obj ? thread_id_obj->GetIntegerValue() : 0;
1036 
1037  ThreadSP new_thread_sp =
1038  std::make_shared<HistoryThread>(*process_sp, tid, pcs);
1039  new_thread_sp->SetName(GenerateThreadName(path, o, info).c_str());
1040 
1041  // Save this in the Process' ExtendedThreadList so a strong pointer
1042  // retains the object
1043  process_sp->GetExtendedThreadList().AddThread(new_thread_sp);
1044  threads->AddThread(new_thread_sp);
1045 
1046  return true;
1047  });
1048 }
1049 
1050 lldb::ThreadCollectionSP
1051 InstrumentationRuntimeTSan::GetBacktracesFromExtendedStopInfo(
1052  StructuredData::ObjectSP info) {
1053 
1054  ThreadCollectionSP threads = std::make_shared<ThreadCollection>();
1055 
1056  if (info->GetObjectForDotSeparatedPath("instrumentation_class")
1057  ->GetStringValue() != "ThreadSanitizer")
1058  return threads;
1059 
1060  ProcessSP process_sp = GetProcessSP();
1061 
1062  AddThreadsForPath("stacks", threads, process_sp, info);
1063  AddThreadsForPath("mops", threads, process_sp, info);
1064  AddThreadsForPath("locs", threads, process_sp, info);
1065  AddThreadsForPath("mutexes", threads, process_sp, info);
1066  AddThreadsForPath("threads", threads, process_sp, info);
1067 
1068  return threads;
1069 }
RegularExpression.h
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static StructuredData::ArraySP ConvertToStructuredArray(ValueObjectSP return_value_sp, const std::string &items_name, const std::string &count_name, std::function< void(const ValueObjectSP &o, const StructuredData::DictionarySP &dict)> const &callback)
Definition: InstrumentationRuntimeTSan.cpp:226
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Definition: ExecutionContext.h:292
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Definition: RegularExpression.h:18
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General Outline: When we hit a breakpoint we need to package up whatever information is needed to eva...
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@ eSymbolTypeCode
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Definition: Symbol.cpp:117
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Get accessor that creates a strong reference from the weak thread reference contained in this object.
Definition: ExecutionContext.cpp:574
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Set the "kind" description for a breakpoint.
Definition: Breakpoint.h:453
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ExpressionResults
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Definition: lldb-enumerations.h:271
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StoppointCallbackContext.h
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size_t GetSize() const
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Get accessor for file specification.
Definition: Declaration.h:107
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lldb::ModuleSP CalculateSymbolContextModule() override
Definition: Symbol.cpp:391
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Definition: InstrumentationRuntimeTSan.cpp:943
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Definition: InstrumentationRuntimeTSan.cpp:545
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@ pc
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Get the load address as an opcode load address.
Definition: Address.cpp:368
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Definition: InstrumentationRuntimeTSan.cpp:262
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Definition: VariableList.h:18
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Definition: Address.h:59
lldb_private::StructuredData::Object::GetAsDictionary
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Definition: StructuredData.h:91
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Set the callback action invoked when the breakpoint is hit.
Definition: Breakpoint.cpp:418
lldb_private::StructuredData::Array::GetItemAtIndexAsInteger
bool GetItemAtIndexAsInteger(size_t idx, IntType &result) const
Definition: StructuredData.h:202
StopInfo.h
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Definition: InstrumentationRuntimeTSan.cpp:300
PluginManager.h
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#define LLDB_INVALID_ADDRESS
Definition: lldb-defines.h:74
lldb_private::ConstString::GetCString
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Get the string value as a C string.
Definition: ConstString.h:215
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Output printf formatted output to the stream.
Definition: Stream.cpp:107
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Definition: lldb-types.h:84
SymbolContext.h
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Definition: InstrumentationRuntimeTSan.cpp:291
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A class that represents a running process on the host machine.
Definition: SBCommandInterpreterRunOptions.h:16
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Definition: StructuredData.cpp:104
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Definition: InstrumentationRuntimeTSan.cpp:249
lldb_private::Breakpoint::GetTarget
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Accessor for the breakpoint Target.
Definition: Breakpoint.h:464
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Definition: InstrumentationRuntime.h:50
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Definition: StreamFile.h:22
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Get accessor for the module for this address.
Definition: Address.cpp:283
Stream.h
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#define LLDB_PLUGIN_DEFINE(PluginName)
Definition: PluginManager.h:31
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Definition: StructuredData.h:62
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Definition: Target.h:361
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Get accessor that creates a strong reference from the weak process reference contained in this object...
Definition: ExecutionContext.cpp:567
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size_t GetSize() const
Definition: StructuredData.h:186
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Objective-C++.
Definition: lldb-enumerations.h:455
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Definition: InstrumentationRuntimeTSan.cpp:614
Variable.h
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Extract the full path to the file.
Definition: FileSpec.cpp:364
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Definition: Declaration.h:24
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Definition: StructuredData.h:70
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Definition: SBAddress.h:15
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Execution context objects refer to objects in the execution of the program that is being debugged.
Definition: ExecutionContext.h:72
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General Outline: A breakpoint has four main parts, a filter, a resolver, the list of breakpoint locat...
Definition: Breakpoint.h:80
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Definition: lldb-types.h:86
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Definition: lldb-enumerations.h:486
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const char * AsCString(const char *default_error_str="unknown error") const
Get the error string associated with the current error.
Definition: Status.cpp:130
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Definition: Target.h:420