LLDB mainline
ThreadPlanStepOut.cpp
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1//===-- ThreadPlanStepOut.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
11#include "lldb/Core/Value.h"
13#include "lldb/Symbol/Block.h"
15#include "lldb/Symbol/Symbol.h"
16#include "lldb/Symbol/Type.h"
17#include "lldb/Target/ABI.h"
18#include "lldb/Target/Process.h"
21#include "lldb/Target/Target.h"
25#include "lldb/Utility/Log.h"
26
27#include <memory>
28
29using namespace lldb;
30using namespace lldb_private;
31
33
34// ThreadPlanStepOut: Step out of the current frame
36 Thread &thread, SymbolContext *context, bool first_insn, bool stop_others,
37 Vote report_stop_vote, Vote report_run_vote, uint32_t frame_idx,
38 LazyBool step_out_avoids_code_without_debug_info,
39 bool continue_to_next_branch, bool gather_return_value)
40 : ThreadPlan(ThreadPlan::eKindStepOut, "Step out", thread, report_stop_vote,
41 report_run_vote),
42 ThreadPlanShouldStopHere(this), m_step_from_insn(LLDB_INVALID_ADDRESS),
43 m_return_bp_id(LLDB_INVALID_BREAK_ID),
44 m_return_addr(LLDB_INVALID_ADDRESS), m_stop_others(stop_others),
45 m_immediate_step_from_function(nullptr),
46 m_calculate_return_value(gather_return_value) {
47 Log *log = GetLog(LLDBLog::Step);
49 SetupAvoidNoDebug(step_out_avoids_code_without_debug_info);
50
51 m_step_from_insn = thread.GetRegisterContext()->GetPC(0);
52
53 uint32_t return_frame_index = frame_idx + 1;
54 StackFrameSP return_frame_sp(thread.GetStackFrameAtIndex(return_frame_index));
55 StackFrameSP immediate_return_from_sp(thread.GetStackFrameAtIndex(frame_idx));
56
57 if (!return_frame_sp || !immediate_return_from_sp)
58 return; // we can't do anything here. ValidatePlan() will return false.
59
60 // While stepping out, behave as-if artificial frames are not present.
61 while (return_frame_sp->IsArtificial()) {
62 m_stepped_past_frames.push_back(return_frame_sp);
63
64 ++return_frame_index;
65 return_frame_sp = thread.GetStackFrameAtIndex(return_frame_index);
66
67 // We never expect to see an artificial frame without a regular ancestor.
68 // If this happens, log the issue and defensively refuse to step out.
69 if (!return_frame_sp) {
70 LLDB_LOG(log, "Can't step out of frame with artificial ancestors");
71 return;
72 }
73 }
74
75 m_step_out_to_id = return_frame_sp->GetStackID();
76 m_immediate_step_from_id = immediate_return_from_sp->GetStackID();
77
78 // If the frame directly below the one we are returning to is inlined, we
79 // have to be a little more careful. It is non-trivial to determine the real
80 // "return code address" for an inlined frame, so we have to work our way to
81 // that frame and then step out.
82 if (immediate_return_from_sp->IsInlined()) {
83 if (frame_idx > 0) {
84 // First queue a plan that gets us to this inlined frame, and when we get
85 // there we'll queue a second plan that walks us out of this frame.
86 m_step_out_to_inline_plan_sp = std::make_shared<ThreadPlanStepOut>(
87 thread, nullptr, false, stop_others, eVoteNoOpinion, eVoteNoOpinion,
88 frame_idx - 1, eLazyBoolNo, continue_to_next_branch);
90 ->SetShouldStopHereCallbacks(nullptr, nullptr);
91 m_step_out_to_inline_plan_sp->SetPrivate(true);
92 } else {
93 // If we're already at the inlined frame we're stepping through, then
94 // just do that now.
96 }
97 } else {
98 // Find the return address and set a breakpoint there:
99 // FIXME - can we do this more securely if we know first_insn?
100
101 Address return_address(return_frame_sp->GetFrameCodeAddress());
102 if (continue_to_next_branch) {
103 SymbolContext return_address_sc;
104 AddressRange range;
105 Address return_address_decr_pc = return_address;
106 if (return_address_decr_pc.GetOffset() > 0)
107 return_address_decr_pc.Slide(-1);
108
109 return_address_decr_pc.CalculateSymbolContext(
110 &return_address_sc, lldb::eSymbolContextLineEntry);
111 if (return_address_sc.line_entry.IsValid()) {
112 const bool include_inlined_functions = false;
113 range = return_address_sc.line_entry.GetSameLineContiguousAddressRange(
114 include_inlined_functions);
115 if (range.GetByteSize() > 0) {
117 return_address, range);
118 }
119 }
120 }
121 m_return_addr = return_address.GetLoadAddress(&m_process.GetTarget());
122
124 return;
125
126 // Perform some additional validation on the return address.
127 uint32_t permissions = 0;
129 LLDB_LOGF(log, "ThreadPlanStepOut(%p): Return address (0x%" PRIx64
130 ") permissions not found.", static_cast<void *>(this),
132 } else if (!(permissions & ePermissionsExecutable)) {
133 m_constructor_errors.Printf("Return address (0x%" PRIx64
134 ") did not point to executable memory.",
136 LLDB_LOGF(log, "ThreadPlanStepOut(%p): %s", static_cast<void *>(this),
138 return;
139 }
140
141 Breakpoint *return_bp =
142 GetTarget().CreateBreakpoint(m_return_addr, true, false).get();
143
144 if (return_bp != nullptr) {
145 if (return_bp->IsHardware() && !return_bp->HasResolvedLocations())
147 return_bp->SetThreadID(m_tid);
148 m_return_bp_id = return_bp->GetID();
149 return_bp->SetBreakpointKind("step-out");
150 }
151
152 if (immediate_return_from_sp) {
153 const SymbolContext &sc =
154 immediate_return_from_sp->GetSymbolContext(eSymbolContextFunction);
155 if (sc.function) {
157 }
158 }
159 }
160}
161
163 LazyBool step_out_avoids_code_without_debug_info) {
164 bool avoid_nodebug = true;
165 switch (step_out_avoids_code_without_debug_info) {
166 case eLazyBoolYes:
167 avoid_nodebug = true;
168 break;
169 case eLazyBoolNo:
170 avoid_nodebug = false;
171 break;
173 avoid_nodebug = GetThread().GetStepOutAvoidsNoDebug();
174 break;
175 }
176 if (avoid_nodebug)
178 else
180}
181
183 Thread &thread = GetThread();
188}
189
193}
194
197 if (level == lldb::eDescriptionLevelBrief)
198 s->Printf("step out");
199 else {
201 s->Printf("Stepping out to inlined frame so we can walk through it.");
203 s->Printf("Stepping out by stepping through inlined function.");
204 else {
205 s->Printf("Stepping out from ");
206 Address tmp_address;
207 if (tmp_address.SetLoadAddress(m_step_from_insn, &GetTarget())) {
210 } else {
211 s->Printf("address 0x%" PRIx64 "", (uint64_t)m_step_from_insn);
212 }
213
214 // FIXME: find some useful way to present the m_return_id, since there may
215 // be multiple copies of the
216 // same function on the stack.
217
218 s->Printf(" returning to frame at ");
219 if (tmp_address.SetLoadAddress(m_return_addr, &GetTarget())) {
222 } else {
223 s->Printf("address 0x%" PRIx64 "", (uint64_t)m_return_addr);
224 }
225
226 if (level == eDescriptionLevelVerbose)
227 s->Printf(" using breakpoint site %d", m_return_bp_id);
228 }
229 }
230
231 if (m_stepped_past_frames.empty())
232 return;
233
234 s->Printf("\n");
235 for (StackFrameSP frame_sp : m_stepped_past_frames) {
236 s->Printf("Stepped out past: ");
237 frame_sp->DumpUsingSettingsFormat(s);
238 }
239}
240
243 return m_step_out_to_inline_plan_sp->ValidatePlan(error);
244
246 return m_step_through_inline_plan_sp->ValidatePlan(error);
247
249 if (error)
250 error->PutCString(
251 "Could not create hardware breakpoint for thread plan.");
252 return false;
253 }
254
256 if (error) {
257 error->PutCString("Could not create return address breakpoint.");
258 if (m_constructor_errors.GetSize() > 0) {
259 error->PutCString(" ");
260 error->PutCString(m_constructor_errors.GetString());
261 }
262 }
263 return false;
264 }
265
266 return true;
267}
268
270 // If the step out plan is done, then we just need to step through the
271 // inlined frame.
273 return m_step_out_to_inline_plan_sp->MischiefManaged();
275 if (m_step_through_inline_plan_sp->MischiefManaged()) {
278 return true;
279 } else
280 return false;
281 } else if (m_step_out_further_plan_sp) {
282 return m_step_out_further_plan_sp->MischiefManaged();
283 }
284
285 // We don't explain signals or breakpoints (breakpoints that handle stepping
286 // in or out will be handled by a child plan.
287
288 StopInfoSP stop_info_sp = GetPrivateStopInfo();
289 if (stop_info_sp) {
290 StopReason reason = stop_info_sp->GetStopReason();
291 if (reason == eStopReasonBreakpoint) {
292 // If this is OUR breakpoint, we're fine, otherwise we don't know why
293 // this happened...
294 BreakpointSiteSP site_sp(
295 m_process.GetBreakpointSiteList().FindByID(stop_info_sp->GetValue()));
296 if (site_sp && site_sp->IsBreakpointAtThisSite(m_return_bp_id)) {
297 bool done;
298
299 StackID frame_zero_id =
300 GetThread().GetStackFrameAtIndex(0)->GetStackID();
301
302 if (m_step_out_to_id == frame_zero_id)
303 done = true;
304 else if (m_step_out_to_id < frame_zero_id) {
305 // Either we stepped past the breakpoint, or the stack ID calculation
306 // was incorrect and we should probably stop.
307 done = true;
308 } else {
309 done = (m_immediate_step_from_id < frame_zero_id);
310 }
311
312 if (done) {
316 }
317 }
318
319 // If there was only one owner, then we're done. But if we also hit
320 // some user breakpoint on our way out, we should mark ourselves as
321 // done, but also not claim to explain the stop, since it is more
322 // important to report the user breakpoint than the step out
323 // completion.
324
325 if (site_sp->GetNumberOfConstituents() == 1)
326 return true;
327 }
328 return false;
329 } else if (IsUsuallyUnexplainedStopReason(reason))
330 return false;
331 else
332 return true;
333 }
334 return true;
335}
336
338 if (IsPlanComplete())
339 return true;
340
341 bool done = false;
343 if (m_step_out_to_inline_plan_sp->MischiefManaged()) {
344 // Now step through the inlined stack we are in:
345 if (QueueInlinedStepPlan(true)) {
346 // If we can't queue a plan to do this, then just call ourselves done.
348 SetPlanComplete(false);
349 return true;
350 } else
351 done = true;
352 } else
353 return m_step_out_to_inline_plan_sp->ShouldStop(event_ptr);
355 if (m_step_through_inline_plan_sp->MischiefManaged())
356 done = true;
357 else
358 return m_step_through_inline_plan_sp->ShouldStop(event_ptr);
359 } else if (m_step_out_further_plan_sp) {
360 if (m_step_out_further_plan_sp->MischiefManaged())
362 else
363 return m_step_out_further_plan_sp->ShouldStop(event_ptr);
364 }
365
366 if (!done) {
367 StackID frame_zero_id = GetThread().GetStackFrameAtIndex(0)->GetStackID();
368 done = !(frame_zero_id < m_step_out_to_id);
369 }
370
371 // The normal step out computations think we are done, so all we need to do
372 // is consult the ShouldStopHere, and we are done.
373
374 if (done) {
378 } else {
381 done = false;
382 }
383 }
384
385 return done;
386}
387
389
391
393 bool current_plan) {
395 return true;
396
398 return false;
399
400 if (current_plan) {
402 if (return_bp != nullptr)
403 return_bp->SetEnabled(true);
404 }
405 return true;
406}
407
411 if (return_bp != nullptr)
412 return_bp->SetEnabled(false);
413 }
414
415 return true;
416}
417
419 if (IsPlanComplete()) {
420 // Did I reach my breakpoint? If so I'm done.
421 //
422 // I also check the stack depth, since if we've blown past the breakpoint
423 // for some
424 // reason and we're now stopping for some other reason altogether, then
425 // we're done with this step out operation.
426
427 Log *log = GetLog(LLDBLog::Step);
428 if (log)
429 LLDB_LOGF(log, "Completed step out plan.");
433 }
434
436 return true;
437 } else {
438 return false;
439 }
440}
441
443 // Now figure out the range of this inlined block, and set up a "step through
444 // range" plan for that. If we've been provided with a context, then use the
445 // block in that context.
446 Thread &thread = GetThread();
447 StackFrameSP immediate_return_from_sp(thread.GetStackFrameAtIndex(0));
448 if (!immediate_return_from_sp)
449 return false;
450
451 Log *log = GetLog(LLDBLog::Step);
452 if (log) {
453 StreamString s;
454 immediate_return_from_sp->Dump(&s, true, false);
455 LLDB_LOGF(log, "Queuing inlined frame to step past: %s.", s.GetData());
456 }
457
458 Block *from_block = immediate_return_from_sp->GetFrameBlock();
459 if (from_block) {
460 Block *inlined_block = from_block->GetContainingInlinedBlock();
461 if (inlined_block) {
462 size_t num_ranges = inlined_block->GetNumRanges();
463 AddressRange inline_range;
464 if (inlined_block->GetRangeAtIndex(0, inline_range)) {
465 SymbolContext inlined_sc;
466 inlined_block->CalculateSymbolContext(&inlined_sc);
467 inlined_sc.target_sp = GetTarget().shared_from_this();
468 RunMode run_mode =
470 const LazyBool avoid_no_debug = eLazyBoolNo;
471
473 std::make_shared<ThreadPlanStepOverRange>(
474 thread, inline_range, inlined_sc, run_mode, avoid_no_debug);
475 ThreadPlanStepOverRange *step_through_inline_plan_ptr =
476 static_cast<ThreadPlanStepOverRange *>(
478 m_step_through_inline_plan_sp->SetPrivate(true);
479
480 step_through_inline_plan_ptr->SetOkayToDiscard(true);
481 StreamString errors;
482 if (!step_through_inline_plan_ptr->ValidatePlan(&errors)) {
483 // FIXME: Log this failure.
484 delete step_through_inline_plan_ptr;
485 return false;
486 }
487
488 for (size_t i = 1; i < num_ranges; i++) {
489 if (inlined_block->GetRangeAtIndex(i, inline_range))
490 step_through_inline_plan_ptr->AddRange(inline_range);
491 }
492
493 if (queue_now)
495 return true;
496 }
497 }
498 }
499
500 return false;
501}
502
505 return;
506
508 return;
509
510 if (m_immediate_step_from_function != nullptr) {
511 CompilerType return_compiler_type =
514 if (return_compiler_type) {
515 lldb::ABISP abi_sp = m_process.GetABI();
516 if (abi_sp)
518 abi_sp->GetReturnValueObject(GetThread(), return_compiler_type);
519 }
520 }
521}
522
524 // If we are still lower on the stack than the frame we are returning to,
525 // then there's something for us to do. Otherwise, we're stale.
526
527 StackID frame_zero_id = GetThread().GetStackFrameAtIndex(0)->GetStackID();
528 return !(frame_zero_id < m_step_out_to_id);
529}
static llvm::raw_ostream & error(Stream &strm)
#define LLDB_LOG(log,...)
The LLDB_LOG* macros defined below are the way to emit log messages.
Definition: Log.h:359
#define LLDB_LOGF(log,...)
Definition: Log.h:366
A section + offset based address range class.
Definition: AddressRange.h:25
lldb::addr_t GetByteSize() const
Get accessor for the byte size of this range.
Definition: AddressRange.h:223
A section + offset based address class.
Definition: Address.h:62
lldb::addr_t GetLoadAddress(Target *target) const
Get the load address.
Definition: Address.cpp:313
bool SetLoadAddress(lldb::addr_t load_addr, Target *target, bool allow_section_end=false)
Set the address to represent load_addr.
Definition: Address.cpp:1047
uint32_t CalculateSymbolContext(SymbolContext *sc, lldb::SymbolContextItem resolve_scope=lldb::eSymbolContextEverything) const
Reconstruct a symbol context from an address.
Definition: Address.cpp:832
@ DumpStyleResolvedDescription
Display the details about what an address resolves to.
Definition: Address.h:104
@ DumpStyleLoadAddress
Display as the load address (if resolved).
Definition: Address.h:99
bool Slide(int64_t offset)
Definition: Address.h:459
bool Dump(Stream *s, ExecutionContextScope *exe_scope, DumpStyle style, DumpStyle fallback_style=DumpStyleInvalid, uint32_t addr_byte_size=UINT32_MAX, bool all_ranges=false, std::optional< Stream::HighlightSettings > settings=std::nullopt) const
Dump a description of this object to a Stream.
Definition: Address.cpp:408
lldb::addr_t GetOffset() const
Get the section relative offset value.
Definition: Address.h:329
A class that describes a single lexical block.
Definition: Block.h:41
void CalculateSymbolContext(SymbolContext *sc) override
Reconstruct the object's symbol context into sc.
Definition: Block.cpp:136
Block * GetContainingInlinedBlock()
Get the inlined block that contains this block.
Definition: Block.cpp:208
bool GetRangeAtIndex(uint32_t range_idx, AddressRange &range)
Definition: Block.cpp:303
size_t GetNumRanges() const
Definition: Block.h:343
General Outline: A breakpoint has four main parts, a filter, a resolver, the list of breakpoint locat...
Definition: Breakpoint.h:81
void SetBreakpointKind(const char *kind)
Set the "kind" description for a breakpoint.
Definition: Breakpoint.h:452
bool HasResolvedLocations() const
Return whether this breakpoint has any resolved locations.
Definition: Breakpoint.cpp:826
bool IsHardware() const
Definition: Breakpoint.h:520
void SetThreadID(lldb::tid_t thread_id)
Set the valid thread to be checked when the breakpoint is hit.
Definition: Breakpoint.cpp:336
void SetEnabled(bool enable) override
If enable is true, enable the breakpoint, if false disable it.
Definition: Breakpoint.cpp:285
Generic representation of a type in a programming language.
Definition: CompilerType.h:36
CompilerType GetFunctionReturnType() const
ValueType Clear(ValueType mask=~static_cast< ValueType >(0))
Clear one or more flags.
Definition: Flags.h:61
ValueType Set(ValueType mask)
Set one or more flags by logical OR'ing mask with the current flags.
Definition: Flags.h:73
CompilerType GetCompilerType()
Definition: Function.cpp:560
StopPointSiteList< lldb_private::BreakpointSite > & GetBreakpointSiteList()
Definition: Process.cpp:1610
Address AdvanceAddressToNextBranchInstruction(Address default_stop_addr, AddressRange range_bounds)
Find the next branch instruction to set a breakpoint on.
Definition: Process.cpp:6154
virtual bool GetLoadAddressPermissions(lldb::addr_t load_addr, uint32_t &permissions)
Attempt to get the attributes for a region of memory in the process.
Definition: Process.cpp:2573
const lldb::ABISP & GetABI()
Definition: Process.cpp:1531
Target & GetTarget()
Get the target object pointer for this module.
Definition: Process.h:1285
StopPointSiteSP FindByID(typename StopPointSite::SiteID site_id)
Returns a shared pointer to the site with id site_id.
lldb::break_id_t GetID() const
Definition: Stoppoint.cpp:22
const char * GetData() const
Definition: StreamString.h:45
llvm::StringRef GetString() const
A stream class that can stream formatted output to a file.
Definition: Stream.h:28
size_t Printf(const char *format,...) __attribute__((format(printf
Output printf formatted output to the stream.
Definition: Stream.cpp:134
Defines a symbol context baton that can be handed other debug core functions.
Definition: SymbolContext.h:34
Function * function
The Function for a given query.
lldb::TargetSP target_sp
The Target for a given query.
LineEntry line_entry
The LineEntry for a given query.
lldb::BreakpointSP GetBreakpointByID(lldb::break_id_t break_id)
Definition: Target.cpp:329
bool RemoveBreakpointByID(lldb::break_id_t break_id)
Definition: Target.cpp:1005
lldb::BreakpointSP CreateBreakpoint(const FileSpecList *containingModules, const FileSpec &file, uint32_t line_no, uint32_t column, lldb::addr_t offset, LazyBool check_inlines, LazyBool skip_prologue, bool internal, bool request_hardware, LazyBool move_to_nearest_code)
Definition: Target.cpp:396
virtual lldb::ThreadPlanSP QueueStepOutFromHerePlan(Flags &flags, lldb::FrameComparison operation, Status &status)
void SetShouldStopHereCallbacks(const ThreadPlanShouldStopHereCallbacks *callbacks, void *baton)
bool InvokeShouldStopHereCallback(lldb::FrameComparison operation, Status &status)
void GetDescription(Stream *s, lldb::DescriptionLevel level) override
Print a description of this thread to the stream s.
lldb::ValueObjectSP m_return_valobj_sp
std::vector< lldb::StackFrameSP > m_stepped_past_frames
bool QueueInlinedStepPlan(bool queue_now)
lldb::StateType GetPlanRunState() override
lldb::ThreadPlanSP m_step_out_further_plan_sp
bool DoWillResume(lldb::StateType resume_state, bool current_plan) override
void SetupAvoidNoDebug(LazyBool step_out_avoids_code_without_debug_info)
ThreadPlanStepOut(Thread &thread, SymbolContext *addr_context, bool first_insn, bool stop_others, Vote report_stop_vote, Vote report_run_vote, uint32_t frame_idx, LazyBool step_out_avoids_code_without_debug_info, bool continue_to_next_branch=false, bool gather_return_value=true)
bool ValidatePlan(Stream *error) override
Returns whether this plan could be successfully created.
bool DoPlanExplainsStop(Event *event_ptr) override
lldb::ThreadPlanSP m_step_through_inline_plan_sp
bool ShouldStop(Event *event_ptr) override
lldb::ThreadPlanSP m_step_out_to_inline_plan_sp
bool ValidatePlan(Stream *error) override
Returns whether this plan could be successfully created.
void AddRange(const AddressRange &new_range)
bool IsUsuallyUnexplainedStopReason(lldb::StopReason)
Definition: ThreadPlan.cpp:166
void SetPlanComplete(bool success=true)
Definition: ThreadPlan.cpp:66
Thread & GetThread()
Returns the Thread that is using this thread plan.
Definition: ThreadPlan.cpp:42
void SetOkayToDiscard(bool value)
Definition: ThreadPlan.h:412
virtual bool MischiefManaged()
Definition: ThreadPlan.cpp:72
lldb::StopInfoSP GetPrivateStopInfo()
Definition: ThreadPlan.h:525
bool GetStepOutAvoidsNoDebug() const
Definition: Thread.cpp:134
virtual lldb::StackFrameSP GetStackFrameAtIndex(uint32_t idx)
Definition: Thread.h:408
Status QueueThreadPlan(lldb::ThreadPlanSP &plan_sp, bool abort_other_plans)
Queues a generic thread plan.
Definition: Thread.cpp:1167
virtual lldb::RegisterContextSP GetRegisterContext()=0
#define LLDB_INVALID_BREAK_ID
Definition: lldb-defines.h:37
#define LLDB_INVALID_ADDRESS
Definition: lldb-defines.h:82
A class that represents a running process on the host machine.
Log * GetLog(Cat mask)
Retrieve the Log object for the channel associated with the given log enum.
Definition: Log.h:331
Definition: SBAddress.h:15
std::shared_ptr< lldb_private::ABI > ABISP
Definition: lldb-forward.h:315
std::shared_ptr< lldb_private::StackFrame > StackFrameSP
Definition: lldb-forward.h:420
std::shared_ptr< lldb_private::BreakpointSite > BreakpointSiteSP
Definition: lldb-forward.h:321
DescriptionLevel
Description levels for "void GetDescription(Stream *, DescriptionLevel)" calls.
@ eDescriptionLevelBrief
@ eDescriptionLevelVerbose
@ eFrameCompareOlder
StateType
Process and Thread States.
@ eStateRunning
Process or thread is running and can't be examined.
std::shared_ptr< lldb_private::StopInfo > StopInfoSP
Definition: lldb-forward.h:427
StopReason
Thread stop reasons.
@ eStopReasonBreakpoint
RunMode
Thread Run Modes.
AddressRange GetSameLineContiguousAddressRange(bool include_inlined_functions) const
Give the range for this LineEntry + any additional LineEntries for this same source line that are con...
Definition: LineEntry.cpp:182
bool IsValid() const
Check if a line entry object is valid.
Definition: LineEntry.cpp:35