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ExecutionContext.h
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1 //===-- ExecutionContext.h --------------------------------------*- C++ -*-===//
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 
9 #ifndef liblldb_ExecutionContext_h_
10 #define liblldb_ExecutionContext_h_
11 
12 #include <mutex>
13 
14 #include "lldb/Target/StackID.h"
15 #include "lldb/lldb-private.h"
16 
17 namespace lldb_private {
18 
19 //===----------------------------------------------------------------------===//
20 /// Execution context objects refer to objects in the execution of the program
21 /// that is being debugged. The consist of one or more of the following
22 /// objects: target, process, thread, and frame. Many objects in the debugger
23 /// need to track different executions contexts. For example, a local function
24 /// variable might have an execution context that refers to a stack frame. A
25 /// global or static variable might refer to a target since a stack frame
26 /// isn't required in order to evaluate a global or static variable (a process
27 /// isn't necessarily needed for a global variable since we might be able to
28 /// read the variable value from a data section in one of the object files in
29 /// a target). There are two types of objects that hold onto execution
30 /// contexts: ExecutionContextRef and ExecutionContext. Both of these objects
31 /// are described below.
32 ///
33 /// Not all objects in an ExecutionContext objects will be valid. If you want
34 /// to refer strongly (ExecutionContext) or weakly (ExecutionContextRef) to a
35 /// process, then only the process and target references will be valid. For
36 /// threads, only the thread, process and target references will be filled in.
37 /// For frames, all of the objects will be filled in.
38 ///
39 /// These classes are designed to be used as baton objects that get passed to
40 /// a wide variety of functions that require execution contexts.
41 //===----------------------------------------------------------------------===//
42 
43 /// \class ExecutionContextRef ExecutionContext.h
44 /// "lldb/Target/ExecutionContext.h"
45 /// A class that holds a weak reference to an execution context.
46 ///
47 /// ExecutionContextRef objects are designed to hold onto an execution context
48 /// that might change over time. For example, if an object wants to refer to a
49 /// stack frame, it should hold onto an ExecutionContextRef to a frame object.
50 /// The backing object that represents the stack frame might change over time
51 /// and instances of this object can track the logical object that refers to a
52 /// frame even if it does change.
53 ///
54 /// These objects also don't keep execution objects around longer than they
55 /// should since they use weak pointers. For example if an object refers to a
56 /// stack frame and a stack frame is no longer in a thread, then a
57 /// ExecutionContextRef object that refers to that frame will not be able to
58 /// get a shared pointer to those objects since they are no longer around.
59 ///
60 /// ExecutionContextRef objects can also be used as objects in classes that
61 /// want to track a "previous execution context". Since the weak references to
62 /// the execution objects (target, process, thread and frame) don't keep these
63 /// objects around, they are safe to keep around.
64 ///
65 /// The general rule of thumb is all long lived objects that want to refer to
66 /// execution contexts should use ExecutionContextRef objects. The
67 /// ExecutionContext class is used to temporarily get shared pointers to any
68 /// execution context objects that are still around so they are guaranteed to
69 /// exist during a function that requires the objects. ExecutionContext
70 /// objects should NOT be used for long term storage since they will keep
71 /// objects alive with extra shared pointer references to these objects.
73 public:
74  /// Default Constructor.
76 
77  /// Copy Constructor.
79 
80  /// Construct using an ExecutionContext object that might be nullptr.
81  ///
82  /// If \a exe_ctx_ptr is valid, then make weak references to any valid
83  /// objects in the ExecutionContext, otherwise no weak references to any
84  /// execution context objects will be made.
85  ExecutionContextRef(const ExecutionContext *exe_ctx_ptr);
86 
87  /// Construct using an ExecutionContext object.
88  ///
89  /// Make weak references to any valid objects in the ExecutionContext.
90  ExecutionContextRef(const ExecutionContext &exe_ctx);
91 
92  /// Construct using the target and all the selected items inside of it (the
93  /// process and its selected thread, and the thread's selected frame). If
94  /// there is no selected thread, default to the first thread If there is no
95  /// selected frame, default to the first frame.
96  ExecutionContextRef(Target *target, bool adopt_selected);
97 
98  /// Construct using an execution context scope.
99  ///
100  /// If the ExecutionContextScope object is valid and refers to a frame, make
101  /// weak references too the frame, thread, process and target. If the
102  /// ExecutionContextScope object is valid and refers to a thread, make weak
103  /// references too the thread, process and target. If the
104  /// ExecutionContextScope object is valid and refers to a process, make weak
105  /// references too the process and target. If the ExecutionContextScope
106  /// object is valid and refers to a target, make weak references too the
107  /// target.
109 
110  /// Construct using an execution context scope.
111  ///
112  /// If the ExecutionContextScope object refers to a frame, make weak
113  /// references too the frame, thread, process and target. If the
114  /// ExecutionContextScope object refers to a thread, make weak references
115  /// too the thread, process and target. If the ExecutionContextScope object
116  /// refers to a process, make weak references too the process and target. If
117  /// the ExecutionContextScope object refers to a target, make weak
118  /// references too the target.
120 
122 
123  /// Assignment operator
124  ///
125  /// Copy all weak references in \a rhs.
127 
128  /// Assignment operator from a ExecutionContext
129  ///
130  /// Make weak references to any strongly referenced objects in \a exe_ctx.
132 
133  /// Clear the object's state.
134  ///
135  /// Sets the process and thread to nullptr, and the frame index to an
136  /// invalid value.
137  void Clear();
138 
139  /// Set accessor that creates a weak reference to the target referenced in
140  /// \a target_sp.
141  ///
142  /// If \a target_sp is valid this object will create a weak reference to
143  /// that object, otherwise any previous target weak reference contained in
144  /// this object will be reset.
145  ///
146  /// Only the weak reference to the target will be updated, no other weak
147  /// references will be modified. If you want this execution context to make
148  /// a weak reference to the target's process, use the
149  /// ExecutionContextRef::SetContext() functions.
150  ///
151  /// \see ExecutionContextRef::SetContext(const lldb::TargetSP &, bool)
152  void SetTargetSP(const lldb::TargetSP &target_sp);
153 
154  /// Set accessor that creates a weak reference to the process referenced in
155  /// \a process_sp.
156  ///
157  /// If \a process_sp is valid this object will create a weak reference to
158  /// that object, otherwise any previous process weak reference contained in
159  /// this object will be reset.
160  ///
161  /// Only the weak reference to the process will be updated, no other weak
162  /// references will be modified. If you want this execution context to make
163  /// a weak reference to the target, use the
164  /// ExecutionContextRef::SetContext() functions.
165  ///
166  /// \see ExecutionContextRef::SetContext(const lldb::ProcessSP &)
167  void SetProcessSP(const lldb::ProcessSP &process_sp);
168 
169  /// Set accessor that creates a weak reference to the thread referenced in
170  /// \a thread_sp.
171  ///
172  /// If \a thread_sp is valid this object will create a weak reference to
173  /// that object, otherwise any previous thread weak reference contained in
174  /// this object will be reset.
175  ///
176  /// Only the weak reference to the thread will be updated, no other weak
177  /// references will be modified. If you want this execution context to make
178  /// a weak reference to the thread's process and target, use the
179  /// ExecutionContextRef::SetContext() functions.
180  ///
181  /// \see ExecutionContextRef::SetContext(const lldb::ThreadSP &)
182  void SetThreadSP(const lldb::ThreadSP &thread_sp);
183 
184  /// Set accessor that creates a weak reference to the frame referenced in \a
185  /// frame_sp.
186  ///
187  /// If \a frame_sp is valid this object will create a weak reference to that
188  /// object, otherwise any previous frame weak reference contained in this
189  /// object will be reset.
190  ///
191  /// Only the weak reference to the frame will be updated, no other weak
192  /// references will be modified. If you want this execution context to make
193  /// a weak reference to the frame's thread, process and target, use the
194  /// ExecutionContextRef::SetContext() functions.
195  ///
196  /// \see ExecutionContextRef::SetContext(const lldb::StackFrameSP &)
197  void SetFrameSP(const lldb::StackFrameSP &frame_sp);
198 
199  void SetTargetPtr(Target *target, bool adopt_selected);
200 
201  void SetProcessPtr(Process *process);
202 
203  void SetThreadPtr(Thread *thread);
204 
205  void SetFramePtr(StackFrame *frame);
206 
207  /// Get accessor that creates a strong reference from the weak target
208  /// reference contained in this object.
209  ///
210  /// \returns
211  /// A shared pointer to a target that is not guaranteed to be valid.
212  lldb::TargetSP GetTargetSP() const;
213 
214  /// Get accessor that creates a strong reference from the weak process
215  /// reference contained in this object.
216  ///
217  /// \returns
218  /// A shared pointer to a process that is not guaranteed to be valid.
219  lldb::ProcessSP GetProcessSP() const;
220 
221  /// Get accessor that creates a strong reference from the weak thread
222  /// reference contained in this object.
223  ///
224  /// \returns
225  /// A shared pointer to a thread that is not guaranteed to be valid.
226  lldb::ThreadSP GetThreadSP() const;
227 
228  /// Get accessor that creates a strong reference from the weak frame
229  /// reference contained in this object.
230  ///
231  /// \returns
232  /// A shared pointer to a frame that is not guaranteed to be valid.
233  lldb::StackFrameSP GetFrameSP() const;
234 
235  /// Create an ExecutionContext object from this object.
236  ///
237  /// Create strong references to any execution context objects that are still
238  /// valid. Any of the returned shared pointers in the ExecutionContext
239  /// objects is not guaranteed to be valid. \returns
240  /// An execution context object that has strong references to
241  /// any valid weak references in this object.
242  ExecutionContext Lock(bool thread_and_frame_only_if_stopped) const;
243 
244  /// Returns true if this object has a weak reference to a thread. The return
245  /// value is only an indication of whether this object has a weak reference
246  /// and does not indicate whether the weak reference is valid or not.
247  bool HasThreadRef() const { return m_tid != LLDB_INVALID_THREAD_ID; }
248 
249  /// Returns true if this object has a weak reference to a frame. The return
250  /// value is only an indication of whether this object has a weak reference
251  /// and does not indicate whether the weak reference is valid or not.
252  bool HasFrameRef() const { return m_stack_id.IsValid(); }
253 
254  void ClearThread() {
255  m_thread_wp.reset();
257  }
258 
260 
261 protected:
262  // Member variables
263  lldb::TargetWP m_target_wp; ///< A weak reference to a target
264  lldb::ProcessWP m_process_wp; ///< A weak reference to a process
265  mutable lldb::ThreadWP m_thread_wp; ///< A weak reference to a thread
266  lldb::tid_t m_tid; ///< The thread ID that this object refers to in case the
267  ///backing object changes
268  StackID m_stack_id; ///< The stack ID that this object refers to in case the
269  ///backing object changes
270 };
271 
272 /// \class ExecutionContext ExecutionContext.h
273 /// "lldb/Target/ExecutionContext.h"
274 /// A class that contains an execution context.
275 ///
276 /// This baton object can be passed into any function that requires a context
277 /// that specifies a target, process, thread and frame. These objects are
278 /// designed to be used for short term execution context object storage while
279 /// a function might be trying to evaluate something that requires a thread or
280 /// frame. ExecutionContextRef objects can be used to initialize one of these
281 /// objects to turn the weak execution context object references to the
282 /// target, process, thread and frame into strong references (shared pointers)
283 /// so that functions can guarantee that these objects won't go away in the
284 /// middle of a function.
285 ///
286 /// ExecutionContext objects should be used as short lived objects (typically
287 /// on the stack) in order to lock down an execution context for local use and
288 /// for passing down to other functions that also require specific contexts.
289 /// They should NOT be used for long term storage, for long term storage use
290 /// ExecutionContextRef objects.
292 public:
293  /// Default Constructor.
295 
296  // Copy constructor
298 
299  // Adopt the target and optionally its current context.
300  ExecutionContext(Target *t, bool fill_current_process_thread_frame = true);
301 
302  // Create execution contexts from shared pointers
303  ExecutionContext(const lldb::TargetSP &target_sp, bool get_process);
304  ExecutionContext(const lldb::ProcessSP &process_sp);
305  ExecutionContext(const lldb::ThreadSP &thread_sp);
306  ExecutionContext(const lldb::StackFrameSP &frame_sp);
307 
308  // Create execution contexts from weak pointers
309  ExecutionContext(const lldb::TargetWP &target_wp, bool get_process);
310  ExecutionContext(const lldb::ProcessWP &process_wp);
311  ExecutionContext(const lldb::ThreadWP &thread_wp);
312  ExecutionContext(const lldb::StackFrameWP &frame_wp);
313  ExecutionContext(const ExecutionContextRef &exe_ctx_ref);
314  ExecutionContext(const ExecutionContextRef *exe_ctx_ref,
315  bool thread_and_frame_only_if_stopped = false);
316 
317  // These two variants take in a locker, and grab the target, lock the API
318  // mutex into locker, then fill in the rest of the shared pointers.
319  ExecutionContext(const ExecutionContextRef &exe_ctx_ref,
320  std::unique_lock<std::recursive_mutex> &locker);
321  ExecutionContext(const ExecutionContextRef *exe_ctx_ref,
322  std::unique_lock<std::recursive_mutex> &locker);
323  // Create execution contexts from execution context scopes
326 
327  /// Construct with process, thread, and frame index.
328  ///
329  /// Initialize with process \a p, thread \a t, and frame index \a f.
330  ///
331  /// \param[in] process
332  /// The process for this execution context.
333  ///
334  /// \param[in] thread
335  /// The thread for this execution context.
336  ///
337  /// \param[in] frame
338  /// The frame index for this execution context.
339  ExecutionContext(Process *process, Thread *thread = nullptr,
340  StackFrame *frame = nullptr);
341 
342  ~ExecutionContext();
343 
345 
346  bool operator==(const ExecutionContext &rhs) const;
347 
348  bool operator!=(const ExecutionContext &rhs) const;
349 
350  /// Clear the object's state.
351  ///
352  /// Sets the process and thread to nullptr, and the frame index to an
353  /// invalid value.
354  void Clear();
355 
356  RegisterContext *GetRegisterContext() const;
357 
358  ExecutionContextScope *GetBestExecutionContextScope() const;
359 
360  uint32_t GetAddressByteSize() const;
361 
362  lldb::ByteOrder GetByteOrder() const;
363 
364  /// Returns a pointer to the target object.
365  ///
366  /// The returned pointer might be nullptr. Calling HasTargetScope(),
367  /// HasProcessScope(), HasThreadScope(), or HasFrameScope() can help to pre-
368  /// validate this pointer so that this accessor can freely be used without
369  /// having to check for nullptr each time.
370  ///
371  /// \see ExecutionContext::HasTargetScope() const @see
372  /// ExecutionContext::HasProcessScope() const @see
373  /// ExecutionContext::HasThreadScope() const @see
374  /// ExecutionContext::HasFrameScope() const
375  Target *GetTargetPtr() const;
376 
377  /// Returns a pointer to the process object.
378  ///
379  /// The returned pointer might be nullptr. Calling HasProcessScope(),
380  /// HasThreadScope(), or HasFrameScope() can help to pre-validate this
381  /// pointer so that this accessor can freely be used without having to check
382  /// for nullptr each time.
383  ///
384  /// \see ExecutionContext::HasProcessScope() const @see
385  /// ExecutionContext::HasThreadScope() const @see
386  /// ExecutionContext::HasFrameScope() const
387  Process *GetProcessPtr() const;
388 
389  /// Returns a pointer to the thread object.
390  ///
391  /// The returned pointer might be nullptr. Calling HasThreadScope() or
392  /// HasFrameScope() can help to pre-validate this pointer so that this
393  /// accessor can freely be used without having to check for nullptr each
394  /// time.
395  ///
396  /// \see ExecutionContext::HasThreadScope() const @see
397  /// ExecutionContext::HasFrameScope() const
398  Thread *GetThreadPtr() const { return m_thread_sp.get(); }
399 
400  /// Returns a pointer to the frame object.
401  ///
402  /// The returned pointer might be nullptr. Calling HasFrameScope(), can help
403  /// to pre-validate this pointer so that this accessor can freely be used
404  /// without having to check for nullptr each time.
405  ///
406  /// \see ExecutionContext::HasFrameScope() const
407  StackFrame *GetFramePtr() const { return m_frame_sp.get(); }
408 
409  /// Returns a reference to the target object.
410  ///
411  /// Clients should call HasTargetScope(), HasProcessScope(),
412  /// HasThreadScope(), or HasFrameScope() prior to calling this function to
413  /// ensure that this ExecutionContext object contains a valid target.
414  ///
415  /// \see ExecutionContext::HasTargetScope() const @see
416  /// ExecutionContext::HasProcessScope() const @see
417  /// ExecutionContext::HasThreadScope() const @see
418  /// ExecutionContext::HasFrameScope() const
419  Target &GetTargetRef() const;
420 
421  /// Returns a reference to the process object.
422  ///
423  /// Clients should call HasProcessScope(), HasThreadScope(), or
424  /// HasFrameScope() prior to calling this function to ensure that this
425  /// ExecutionContext object contains a valid target.
426  ///
427  /// \see ExecutionContext::HasProcessScope() const @see
428  /// ExecutionContext::HasThreadScope() const @see
429  /// ExecutionContext::HasFrameScope() const
430  Process &GetProcessRef() const;
431 
432  /// Returns a reference to the thread object.
433  ///
434  /// Clients should call HasThreadScope(), or HasFrameScope() prior to
435  /// calling this function to ensure that this ExecutionContext object
436  /// contains a valid target.
437  ///
438  /// \see ExecutionContext::HasThreadScope() const @see
439  /// ExecutionContext::HasFrameScope() const
440  Thread &GetThreadRef() const;
441 
442  /// Returns a reference to the thread object.
443  ///
444  /// Clients should call HasFrameScope() prior to calling this function to
445  /// ensure that this ExecutionContext object contains a valid target.
446  ///
447  /// \see ExecutionContext::HasFrameScope() const
448  StackFrame &GetFrameRef() const;
449 
450  /// Get accessor to get the target shared pointer.
451  ///
452  /// The returned shared pointer is not guaranteed to be valid.
453  const lldb::TargetSP &GetTargetSP() const { return m_target_sp; }
454 
455  /// Get accessor to get the process shared pointer.
456  ///
457  /// The returned shared pointer is not guaranteed to be valid.
458  const lldb::ProcessSP &GetProcessSP() const { return m_process_sp; }
459 
460  /// Get accessor to get the thread shared pointer.
461  ///
462  /// The returned shared pointer is not guaranteed to be valid.
463  const lldb::ThreadSP &GetThreadSP() const { return m_thread_sp; }
464 
465  /// Get accessor to get the frame shared pointer.
466  ///
467  /// The returned shared pointer is not guaranteed to be valid.
468  const lldb::StackFrameSP &GetFrameSP() const { return m_frame_sp; }
469 
470  /// Set accessor to set only the target shared pointer.
471  void SetTargetSP(const lldb::TargetSP &target_sp);
472 
473  /// Set accessor to set only the process shared pointer.
474  void SetProcessSP(const lldb::ProcessSP &process_sp);
475 
476  /// Set accessor to set only the thread shared pointer.
477  void SetThreadSP(const lldb::ThreadSP &thread_sp);
478 
479  /// Set accessor to set only the frame shared pointer.
480  void SetFrameSP(const lldb::StackFrameSP &frame_sp);
481 
482  /// Set accessor to set only the target shared pointer from a target
483  /// pointer.
484  void SetTargetPtr(Target *target);
485 
486  /// Set accessor to set only the process shared pointer from a process
487  /// pointer.
488  void SetProcessPtr(Process *process);
489 
490  /// Set accessor to set only the thread shared pointer from a thread
491  /// pointer.
492  void SetThreadPtr(Thread *thread);
493 
494  /// Set accessor to set only the frame shared pointer from a frame pointer.
495  void SetFramePtr(StackFrame *frame);
496 
497  // Set the execution context using a target shared pointer.
498  //
499  // If "target_sp" is valid, sets the target context to match and if
500  // "get_process" is true, sets the process shared pointer if the target
501  // currently has a process.
502  void SetContext(const lldb::TargetSP &target_sp, bool get_process);
503 
504  // Set the execution context using a process shared pointer.
505  //
506  // If "process_sp" is valid, then set the process and target in this context.
507  // Thread and frame contexts will be cleared. If "process_sp" is not valid,
508  // all shared pointers are reset.
509  void SetContext(const lldb::ProcessSP &process_sp);
510 
511  // Set the execution context using a thread shared pointer.
512  //
513  // If "thread_sp" is valid, then set the thread, process and target in this
514  // context. The frame context will be cleared. If "thread_sp" is not valid,
515  // all shared pointers are reset.
516  void SetContext(const lldb::ThreadSP &thread_sp);
517 
518  // Set the execution context using a frame shared pointer.
519  //
520  // If "frame_sp" is valid, then set the frame, thread, process and target in
521  // this context If "frame_sp" is not valid, all shared pointers are reset.
522  void SetContext(const lldb::StackFrameSP &frame_sp);
523 
524  /// Returns true the ExecutionContext object contains a valid target.
525  ///
526  /// This function can be called after initializing an ExecutionContext
527  /// object, and if it returns true, calls to GetTargetPtr() and
528  /// GetTargetRef() do not need to be checked for validity.
529  bool HasTargetScope() const;
530 
531  /// Returns true the ExecutionContext object contains a valid target and
532  /// process.
533  ///
534  /// This function can be called after initializing an ExecutionContext
535  /// object, and if it returns true, calls to GetTargetPtr() and
536  /// GetTargetRef(), GetProcessPtr(), and GetProcessRef(), do not need to be
537  /// checked for validity.
538  bool HasProcessScope() const;
539 
540  /// Returns true the ExecutionContext object contains a valid target,
541  /// process, and thread.
542  ///
543  /// This function can be called after initializing an ExecutionContext
544  /// object, and if it returns true, calls to GetTargetPtr(), GetTargetRef(),
545  /// GetProcessPtr(), GetProcessRef(), GetThreadPtr(), and GetThreadRef() do
546  /// not need to be checked for validity.
547  bool HasThreadScope() const;
548 
549  /// Returns true the ExecutionContext object contains a valid target,
550  /// process, thread and frame.
551  ///
552  /// This function can be called after initializing an ExecutionContext
553  /// object, and if it returns true, calls to GetTargetPtr(), GetTargetRef(),
554  /// GetProcessPtr(), GetProcessRef(), GetThreadPtr(), GetThreadRef(),
555  /// GetFramePtr(), and GetFrameRef() do not need to be checked for validity.
556  bool HasFrameScope() const;
557 
558 protected:
559  // Member variables
560  lldb::TargetSP m_target_sp; ///< The target that owns the process/thread/frame
561  lldb::ProcessSP m_process_sp; ///< The process that owns the thread/frame
562  lldb::ThreadSP m_thread_sp; ///< The thread that owns the frame
563  lldb::StackFrameSP m_frame_sp; ///< The stack frame in thread.
564 };
565 
566 } // namespace lldb_private
567 
568 #endif // liblldb_ExecutionContext_h_
lldb::ThreadSP m_thread_sp
The thread that owns the frame.
const lldb::ThreadSP & GetThreadSP() const
Get accessor to get the thread shared pointer.
void Clear()
Clear the object&#39;s state.
Enumerations for broadcasting.
Definition: SBLaunchInfo.h:14
void SetTargetSP(const lldb::TargetSP &target_sp)
Set accessor that creates a weak reference to the target referenced in target_sp. ...
void SetFrameSP(const lldb::StackFrameSP &frame_sp)
Set accessor that creates a weak reference to the frame referenced in frame_sp.
void SetThreadSP(const lldb::ThreadSP &thread_sp)
Set accessor that creates a weak reference to the thread referenced in thread_sp. ...
const lldb::TargetSP & GetTargetSP() const
Get accessor to get the target shared pointer.
lldb::ProcessSP GetProcessSP() const
Get accessor that creates a strong reference from the weak process reference contained in this object...
void SetTargetPtr(Target *target, bool adopt_selected)
"lldb/Target/ExecutionContext.h" A class that contains an execution context.
lldb::ProcessSP m_process_sp
The process that owns the thread/frame.
lldb::TargetWP m_target_wp
A weak reference to a target.
StackFrame * GetFramePtr() const
Returns a pointer to the frame object.
ExecutionContextRef()
Default Constructor.
bool operator==(const Address &lhs, const Address &rhs)
Definition: Address.cpp:973
lldb::ThreadSP GetThreadSP() const
Get accessor that creates a strong reference from the weak thread reference contained in this object...
lldb::TargetSP m_target_sp
The target that owns the process/thread/frame.
void SetProcessSP(const lldb::ProcessSP &process_sp)
Set accessor that creates a weak reference to the process referenced in process_sp.
void SetFramePtr(StackFrame *frame)
ExecutionContextRef & operator=(const ExecutionContextRef &rhs)
Assignment operator.
lldb::ThreadWP m_thread_wp
A weak reference to a thread.
uint64_t tid_t
Definition: lldb-types.h:86
const lldb::StackFrameSP & GetFrameSP() const
Get accessor to get the frame shared pointer.
"lldb/Target/ExecutionContextScope.h" Inherit from this if your object can reconstruct its execution ...
bool HasThreadRef() const
Returns true if this object has a weak reference to a thread.
A plug-in interface definition class for debugging a process.
Definition: Process.h:353
ExecutionContext Lock(bool thread_and_frame_only_if_stopped) const
Create an ExecutionContext object from this object.
lldb::ProcessWP m_process_wp
A weak reference to a process.
const lldb::ProcessSP & GetProcessSP() const
Get accessor to get the process shared pointer.
Execution context objects refer to objects in the execution of the program that is being debugged...
lldb::StackFrameSP m_frame_sp
The stack frame in thread.
bool operator!=(const Address &lhs, const Address &rhs)
Definition: Address.cpp:979
lldb::TargetSP GetTargetSP() const
Get accessor that creates a strong reference from the weak target reference contained in this object...
lldb::tid_t m_tid
The thread ID that this object refers to in case the backing object changes.
#define LLDB_INVALID_THREAD_ID
Definition: lldb-defines.h:93
Thread * GetThreadPtr() const
Returns a pointer to the thread object.
StackID m_stack_id
The stack ID that this object refers to in case the backing object changes.
lldb::StackFrameSP GetFrameSP() const
Get accessor that creates a strong reference from the weak frame reference contained in this object...
bool HasFrameRef() const
Returns true if this object has a weak reference to a frame.
bool IsValid() const
Definition: StackID.h:49
void SetProcessPtr(Process *process)
This base class provides an interface to stack frames.
Definition: StackFrame.h:40