LLDB  mainline
ThreadPlanCallFunction.cpp
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1 //===-- ThreadPlanCallFunction.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 
12 #include "lldb/Core/Address.h"
14 #include "lldb/Core/Module.h"
15 #include "lldb/Symbol/ObjectFile.h"
16 #include "lldb/Target/ABI.h"
18 #include "lldb/Target/Process.h"
20 #include "lldb/Target/StopInfo.h"
21 #include "lldb/Target/Target.h"
22 #include "lldb/Target/Thread.h"
24 #include "lldb/Utility/Log.h"
25 #include "lldb/Utility/Stream.h"
26 
27 #include <memory>
28 
29 using namespace lldb;
30 using namespace lldb_private;
31 
32 // ThreadPlanCallFunction: Plan to call a single function
33 bool ThreadPlanCallFunction::ConstructorSetup(
34  Thread &thread, ABI *&abi, lldb::addr_t &start_load_addr,
35  lldb::addr_t &function_load_addr) {
36  SetIsMasterPlan(true);
37  SetOkayToDiscard(false);
38  SetPrivate(true);
39 
40  ProcessSP process_sp(thread.GetProcess());
41  if (!process_sp)
42  return false;
43 
44  abi = process_sp->GetABI().get();
45 
46  if (!abi)
47  return false;
48 
50 
51  SetBreakpoints();
52 
53  m_function_sp = thread.GetRegisterContext()->GetSP() - abi->GetRedZoneSize();
54  // If we can't read memory at the point of the process where we are planning
55  // to put our function, we're not going to get any further...
56  Status error;
57  process_sp->ReadUnsignedIntegerFromMemory(m_function_sp, 4, 0, error);
58  if (!error.Success()) {
59  m_constructor_errors.Printf(
60  "Trying to put the stack in unreadable memory at: 0x%" PRIx64 ".",
61  m_function_sp);
62  LLDB_LOGF(log, "ThreadPlanCallFunction(%p): %s.", static_cast<void *>(this),
63  m_constructor_errors.GetData());
64  return false;
65  }
66 
67  llvm::Expected<Address> start_address = GetTarget().GetEntryPointAddress();
68  if (!start_address) {
69  m_constructor_errors.Printf(
70  "%s", llvm::toString(start_address.takeError()).c_str());
71  LLDB_LOGF(log, "ThreadPlanCallFunction(%p): %s.", static_cast<void *>(this),
72  m_constructor_errors.GetData());
73  return false;
74  }
75 
76  m_start_addr = *start_address;
77  start_load_addr = m_start_addr.GetLoadAddress(&GetTarget());
78 
79  // Checkpoint the thread state so we can restore it later.
80  if (log && log->GetVerbose())
81  ReportRegisterState("About to checkpoint thread before function call. "
82  "Original register state was:");
83 
84  if (!thread.CheckpointThreadState(m_stored_thread_state)) {
85  m_constructor_errors.Printf("Setting up ThreadPlanCallFunction, failed to "
86  "checkpoint thread state.");
87  LLDB_LOGF(log, "ThreadPlanCallFunction(%p): %s.", static_cast<void *>(this),
88  m_constructor_errors.GetData());
89  return false;
90  }
91  function_load_addr = m_function_addr.GetLoadAddress(&GetTarget());
92 
93  return true;
94 }
95 
96 ThreadPlanCallFunction::ThreadPlanCallFunction(
97  Thread &thread, const Address &function, const CompilerType &return_type,
98  llvm::ArrayRef<addr_t> args, const EvaluateExpressionOptions &options)
99  : ThreadPlan(ThreadPlan::eKindCallFunction, "Call function plan", thread,
101  m_valid(false), m_stop_other_threads(options.GetStopOthers()),
102  m_unwind_on_error(options.DoesUnwindOnError()),
103  m_ignore_breakpoints(options.DoesIgnoreBreakpoints()),
104  m_debug_execution(options.GetDebug()),
105  m_trap_exceptions(options.GetTrapExceptions()), m_function_addr(function),
106  m_function_sp(0), m_takedown_done(false),
107  m_should_clear_objc_exception_bp(false),
108  m_should_clear_cxx_exception_bp(false),
109  m_stop_address(LLDB_INVALID_ADDRESS), m_return_type(return_type) {
110  lldb::addr_t start_load_addr = LLDB_INVALID_ADDRESS;
111  lldb::addr_t function_load_addr = LLDB_INVALID_ADDRESS;
112  ABI *abi = nullptr;
113 
114  if (!ConstructorSetup(thread, abi, start_load_addr, function_load_addr))
115  return;
116 
117  if (!abi->PrepareTrivialCall(thread, m_function_sp, function_load_addr,
118  start_load_addr, args))
119  return;
120 
121  ReportRegisterState("Function call was set up. Register state was:");
122 
123  m_valid = true;
124 }
125 
127  Thread &thread, const Address &function,
128  const EvaluateExpressionOptions &options)
129  : ThreadPlan(ThreadPlan::eKindCallFunction, "Call function plan", thread,
131  m_valid(false), m_stop_other_threads(options.GetStopOthers()),
132  m_unwind_on_error(options.DoesUnwindOnError()),
133  m_ignore_breakpoints(options.DoesIgnoreBreakpoints()),
134  m_debug_execution(options.GetDebug()),
135  m_trap_exceptions(options.GetTrapExceptions()), m_function_addr(function),
136  m_function_sp(0), m_takedown_done(false),
137  m_should_clear_objc_exception_bp(false),
138  m_should_clear_cxx_exception_bp(false),
139  m_stop_address(LLDB_INVALID_ADDRESS), m_return_type(CompilerType()) {}
140 
143 }
144 
147  if (log && log->GetVerbose()) {
148  StreamString strm;
149  RegisterContext *reg_ctx = GetThread().GetRegisterContext().get();
150 
151  log->PutCString(message);
152 
153  RegisterValue reg_value;
154 
155  for (uint32_t reg_idx = 0, num_registers = reg_ctx->GetRegisterCount();
156  reg_idx < num_registers; ++reg_idx) {
157  const RegisterInfo *reg_info = reg_ctx->GetRegisterInfoAtIndex(reg_idx);
158  if (reg_ctx->ReadRegister(reg_info, reg_value)) {
159  DumpRegisterValue(reg_value, &strm, reg_info, true, false,
161  strm.EOL();
162  }
163  }
164  log->PutString(strm.GetString());
165  }
166 }
167 
170 
171  if (!m_valid) {
172  // Don't call DoTakedown if we were never valid to begin with.
173  LLDB_LOGF(log,
174  "ThreadPlanCallFunction(%p): Log called on "
175  "ThreadPlanCallFunction that was never valid.",
176  static_cast<void *>(this));
177  return;
178  }
179 
180  if (!m_takedown_done) {
181  Thread &thread = GetThread();
182  if (success) {
183  SetReturnValue();
184  }
185  LLDB_LOGF(log,
186  "ThreadPlanCallFunction(%p): DoTakedown called for thread "
187  "0x%4.4" PRIx64 ", m_valid: %d complete: %d.\n",
188  static_cast<void *>(this), m_tid, m_valid, IsPlanComplete());
189  m_takedown_done = true;
191  thread.GetStackFrameAtIndex(0)->GetRegisterContext()->GetPC();
194  LLDB_LOGF(log,
195  "ThreadPlanCallFunction(%p): DoTakedown failed to restore "
196  "register state",
197  static_cast<void *>(this));
198  }
199  SetPlanComplete(success);
201  if (log && log->GetVerbose())
202  ReportRegisterState("Restoring thread state after function call. "
203  "Restored register state:");
204  } else {
205  LLDB_LOGF(log,
206  "ThreadPlanCallFunction(%p): DoTakedown called as no-op for "
207  "thread 0x%4.4" PRIx64 ", m_valid: %d complete: %d.\n",
208  static_cast<void *>(this), m_tid, m_valid, IsPlanComplete());
209  }
210 }
211 
213 
215  if (level == eDescriptionLevelBrief) {
216  s->Printf("Function call thread plan");
217  } else {
218  s->Printf("Thread plan to call 0x%" PRIx64,
220  }
221 }
222 
224  if (!m_valid) {
225  if (error) {
226  if (m_constructor_errors.GetSize() > 0)
227  error->PutCString(m_constructor_errors.GetString());
228  else
229  error->PutCString("Unknown error");
230  }
231  return false;
232  }
233 
234  return true;
235 }
236 
239  return eVoteYes;
240  else
241  return ThreadPlan::ShouldReportStop(event_ptr);
242 }
243 
248 
249  // If our subplan knows why we stopped, even if it's done (which would
250  // forward the question to us) we answer yes.
251  if (m_subplan_sp && m_subplan_sp->PlanExplainsStop(event_ptr)) {
252  SetPlanComplete();
253  return true;
254  }
255 
256  // Check if the breakpoint is one of ours.
257 
258  StopReason stop_reason;
259  if (!m_real_stop_info_sp)
260  stop_reason = eStopReasonNone;
261  else
262  stop_reason = m_real_stop_info_sp->GetStopReason();
263  LLDB_LOG(log,
264  "ThreadPlanCallFunction::PlanExplainsStop: Got stop reason - {0}.",
265  Thread::StopReasonAsString(stop_reason));
266 
267  if (stop_reason == eStopReasonBreakpoint && BreakpointsExplainStop())
268  return true;
269 
270  // One more quirk here. If this event was from Halt interrupting the target,
271  // then we should not consider ourselves complete. Return true to
272  // acknowledge the stop.
274  LLDB_LOGF(log, "ThreadPlanCallFunction::PlanExplainsStop: The event is an "
275  "Interrupt, returning true.");
276  return true;
277  }
278  // We control breakpoints separately from other "stop reasons." So first,
279  // check the case where we stopped for an internal breakpoint, in that case,
280  // continue on. If it is not an internal breakpoint, consult
281  // m_ignore_breakpoints.
282 
283  if (stop_reason == eStopReasonBreakpoint) {
284  uint64_t break_site_id = m_real_stop_info_sp->GetValue();
285  BreakpointSiteSP bp_site_sp;
286  bp_site_sp = m_process.GetBreakpointSiteList().FindByID(break_site_id);
287  if (bp_site_sp) {
288  uint32_t num_owners = bp_site_sp->GetNumberOfOwners();
289  bool is_internal = true;
290  for (uint32_t i = 0; i < num_owners; i++) {
291  Breakpoint &bp = bp_site_sp->GetOwnerAtIndex(i)->GetBreakpoint();
292  LLDB_LOGF(log,
293  "ThreadPlanCallFunction::PlanExplainsStop: hit "
294  "breakpoint %d while calling function",
295  bp.GetID());
296 
297  if (!bp.IsInternal()) {
298  is_internal = false;
299  break;
300  }
301  }
302  if (is_internal) {
303  LLDB_LOGF(log, "ThreadPlanCallFunction::PlanExplainsStop hit an "
304  "internal breakpoint, not stopping.");
305  return false;
306  }
307  }
308 
309  if (m_ignore_breakpoints) {
310  LLDB_LOGF(log,
311  "ThreadPlanCallFunction::PlanExplainsStop: we are ignoring "
312  "breakpoints, overriding breakpoint stop info ShouldStop, "
313  "returning true");
314  m_real_stop_info_sp->OverrideShouldStop(false);
315  return true;
316  } else {
317  LLDB_LOGF(log, "ThreadPlanCallFunction::PlanExplainsStop: we are not "
318  "ignoring breakpoints, overriding breakpoint stop info "
319  "ShouldStop, returning true");
320  m_real_stop_info_sp->OverrideShouldStop(true);
321  return false;
322  }
323  } else if (!m_unwind_on_error) {
324  // If we don't want to discard this plan, than any stop we don't understand
325  // should be propagated up the stack.
326  return false;
327  } else {
328  // If the subplan is running, any crashes are attributable to us. If we
329  // want to discard the plan, then we say we explain the stop but if we are
330  // going to be discarded, let whoever is above us explain the stop. But
331  // don't discard the plan if the stop would restart itself (for instance if
332  // it is a signal that is set not to stop. Check that here first. We just
333  // say we explain the stop but aren't done and everything will continue on
334  // from there.
335 
336  if (m_real_stop_info_sp &&
337  m_real_stop_info_sp->ShouldStopSynchronous(event_ptr)) {
338  SetPlanComplete(false);
339  return m_subplan_sp ? m_unwind_on_error : false;
340  } else
341  return true;
342  }
343 }
344 
346  // We do some computation in DoPlanExplainsStop that may or may not set the
347  // plan as complete. We need to do that here to make sure our state is
348  // correct.
349  DoPlanExplainsStop(event_ptr);
350 
351  if (IsPlanComplete()) {
352  ReportRegisterState("Function completed. Register state was:");
353  return true;
354  } else {
355  return false;
356  }
357 }
358 
360 
362 
364  //#define SINGLE_STEP_EXPRESSIONS
365 
366  // Now set the thread state to "no reason" so we don't run with whatever
367  // signal was outstanding... Wait till the plan is pushed so we aren't
368  // changing the stop info till we're about to run.
369 
371 
372 #ifndef SINGLE_STEP_EXPRESSIONS
373  Thread &thread = GetThread();
374  m_subplan_sp = std::make_shared<ThreadPlanRunToAddress>(thread, m_start_addr,
376 
377  thread.QueueThreadPlan(m_subplan_sp, false);
378  m_subplan_sp->SetPrivate(true);
379 #endif
380 }
381 
382 bool ThreadPlanCallFunction::WillStop() { return true; }
383 
386 
387  if (IsPlanComplete()) {
388  LLDB_LOGF(log, "ThreadPlanCallFunction(%p): Completed call function plan.",
389  static_cast<void *>(this));
390 
392  return true;
393  } else {
394  return false;
395  }
396 }
397 
399  if (m_trap_exceptions) {
403 
408  }
413  }
414  }
415 }
416 
418  if (m_trap_exceptions) {
423  }
424 }
425 
427  StopInfoSP stop_info_sp = GetPrivateStopInfo();
428 
429  if (m_trap_exceptions) {
430  if ((m_cxx_language_runtime &&
432  stop_info_sp)) ||
435  stop_info_sp))) {
437  LLDB_LOGF(log, "ThreadPlanCallFunction::BreakpointsExplainStop - Hit an "
438  "exception breakpoint, setting plan complete.");
439 
440  SetPlanComplete(false);
441 
442  // If the user has set the ObjC language breakpoint, it would normally
443  // get priority over our internal catcher breakpoint, but in this case we
444  // can't let that happen, so force the ShouldStop here.
445  stop_info_sp->OverrideShouldStop(true);
446  return true;
447  }
448  }
449 
450  return false;
451 }
452 
454  m_subplan_sp->SetStopOthers(new_value);
455 }
456 
459 }
460 
462  const ABI *abi = m_process.GetABI().get();
463  if (abi && m_return_type.IsValid()) {
464  const bool persistent = false;
466  abi->GetReturnValueObject(GetThread(), m_return_type, persistent);
467  }
468 }
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Definition: lldb-enumerations.h:243
lldb_private::Vote
Vote
Definition: lldb-private-enumerations.h:59
LLDB_INVALID_ADDRESS
#define LLDB_INVALID_ADDRESS
Definition: lldb-defines.h:86
LLDB_LOG
#define LLDB_LOG(log,...)
The LLDB_LOG* macros defined below are the way to emit log messages.
Definition: Log.h:242
lldb_private::CompilerType
Generic representation of a type in a programming language.
Definition: CompilerType.h:33
lldb_private::Stream::Printf
size_t Printf(const char *format,...) __attribute__((format(printf
Output printf formatted output to the stream.
Definition: Stream.cpp:107
lldb_private::ThreadPlanCallFunction::m_objc_language_runtime
LanguageRuntime * m_objc_language_runtime
Definition: ThreadPlanCallFunction.h:129
lldb_private::ThreadPlanCallFunction::m_return_valobj_sp
lldb::ValueObjectSP m_return_valobj_sp
Definition: ThreadPlanCallFunction.h:137
LanguageRuntime.h
lldb_private
A class that represents a running process on the host machine.
Definition: SBCommandInterpreterRunOptions.h:16
lldb_private::ThreadPlanCallFunction::SetStopOthers
void SetStopOthers(bool new_value) override
Definition: ThreadPlanCallFunction.cpp:453
lldb_private::ThreadPlanCallFunction::m_stop_other_threads
bool m_stop_other_threads
Definition: ThreadPlanCallFunction.h:119
lldb_private::ABI::PrepareTrivialCall
virtual bool PrepareTrivialCall(lldb_private::Thread &thread, lldb::addr_t sp, lldb::addr_t functionAddress, lldb::addr_t returnAddress, llvm::ArrayRef< lldb::addr_t > args) const =0
lldb_private::ThreadPlanCallFunction::~ThreadPlanCallFunction
~ThreadPlanCallFunction() override
Definition: ThreadPlanCallFunction.cpp:141
Breakpoint.h
LIBLLDB_LOG_STEP
#define LIBLLDB_LOG_STEP
Definition: Logging.h:21
lldb_private::ThreadPlanCallFunction::m_constructor_errors
StreamString m_constructor_errors
Definition: ThreadPlanCallFunction.h:136
lldb_private::ThreadPlan::m_tid
lldb::tid_t m_tid
Definition: ThreadPlan.h:524
lldb_private::ThreadPlan::ShouldReportStop
virtual Vote ShouldReportStop(Event *event_ptr)
Definition: ThreadPlan.cpp:78
lldb_private::Process::GetABI
const lldb::ABISP & GetABI()
Definition: Process.cpp:1475
lldb_private::ThreadPlanCallFunction::m_start_addr
Address m_start_addr
Definition: ThreadPlanCallFunction.h:125
lldb::StateType
StateType
Process and Thread States.
Definition: lldb-enumerations.h:73
Stream.h
lldb_private::Thread::StopReasonAsString
static std::string StopReasonAsString(lldb::StopReason reason)
Definition: Thread.cpp:1664
lldb_private::Log
Definition: Log.h:49
lldb_private::ThreadPlanCallFunction::GetDescription
void GetDescription(Stream *s, lldb::DescriptionLevel level) override
Print a description of this thread to the stream s.
Definition: ThreadPlanCallFunction.cpp:214
lldb_private::Thread::GetStackFrameAtIndex
virtual lldb::StackFrameSP GetStackFrameAtIndex(uint32_t idx)
Definition: Thread.h:399
lldb_private::GetLogIfAnyCategoriesSet
Log * GetLogIfAnyCategoriesSet(uint32_t mask)
Definition: Logging.cpp:62
lldb_private::ThreadPlanCallFunction::m_ignore_breakpoints
bool m_ignore_breakpoints
Definition: ThreadPlanCallFunction.h:121
lldb_private::ThreadPlanCallFunction::m_should_clear_objc_exception_bp
bool m_should_clear_objc_exception_bp
Definition: ThreadPlanCallFunction.h:142
lldb_private::ThreadPlan::GetPrivateStopInfo
lldb::StopInfoSP GetPrivateStopInfo()
Definition: ThreadPlan.h:510
lldb_private::Thread::GetRegisterContext
virtual lldb::RegisterContextSP GetRegisterContext()=0
lldb_private::ABI::GetReturnValueObject
lldb::ValueObjectSP GetReturnValueObject(Thread &thread, CompilerType &type, bool persistent=true) const
Definition: ABI.cpp:69
lldb_private::ThreadPlan::m_process
Process & m_process
Definition: ThreadPlan.h:523
lldb_private::LanguageRuntime::ExceptionBreakpointsAreSet
virtual bool ExceptionBreakpointsAreSet()
Definition: LanguageRuntime.h:105
lldb_private::ThreadPlanCallFunction::ValidatePlan
bool ValidatePlan(Stream *error) override
Returns whether this plan could be successfully created.
Definition: ThreadPlanCallFunction.cpp:223
lldb
Definition: SBAddress.h:15
LIBLLDB_LOG_PROCESS
#define LIBLLDB_LOG_PROCESS
Definition: Logging.h:15
lldb::eStateRunning
@ eStateRunning
Process or thread is running and can't be examined.
Definition: lldb-enumerations.h:85
RegisterContext.h
lldb_private::ThreadPlanCallFunction::SetBreakpoints
void SetBreakpoints()
Definition: ThreadPlanCallFunction.cpp:398
lldb::eFormatDefault
@ eFormatDefault
Definition: lldb-enumerations.h:156
lldb::eDescriptionLevelBrief
@ eDescriptionLevelBrief
Definition: lldb-enumerations.h:208
lldb_private::ThreadPlanCallFunction::m_stored_thread_state
Thread::ThreadStateCheckpoint m_stored_thread_state
Definition: ThreadPlanCallFunction.h:130
lldb::DescriptionLevel
DescriptionLevel
Description levels for "void GetDescription(Stream *, DescriptionLevel)" calls.
Definition: lldb-enumerations.h:207
lldb_private::Breakpoint
General Outline: A breakpoint has four main parts, a filter, a resolver, the list of breakpoint locat...
Definition: Breakpoint.h:79
lldb_private::ThreadPlanCallFunction::DoTakedown
virtual void DoTakedown(bool success)
Definition: ThreadPlanCallFunction.cpp:168
lldb_private::Log::PutCString
void PutCString(const char *cstr)
Definition: Log.cpp:118
lldb::eLanguageTypeC_plus_plus
@ eLanguageTypeC_plus_plus
ISO C++:1998.
Definition: lldb-enumerations.h:441