LLDB mainline
CommandObjectWatchpointCommand.cpp
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1//===-- CommandObjectWatchpointCommand.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
9#include <vector>
10
15#include "lldb/Core/IOHandler.h"
21#include "lldb/Target/Target.h"
22
23using namespace lldb;
24using namespace lldb_private;
25
26#define LLDB_OPTIONS_watchpoint_command_add
27#include "CommandOptions.inc"
28
31public:
33 : CommandObjectParsed(interpreter, "add",
34 "Add a set of LLDB commands to a watchpoint, to be "
35 "executed whenever the watchpoint is hit. "
36 "The commands added to the watchpoint replace any "
37 "commands previously added to it.",
38 nullptr, eCommandRequiresTarget),
42 R"(
43General information about entering watchpoint commands
44------------------------------------------------------
45
46)"
47 "This command will prompt for commands to be executed when the specified \
48watchpoint is hit. Each command is typed on its own line following the '> ' \
49prompt until 'DONE' is entered."
50 R"(
51
52)"
53 "Syntactic errors may not be detected when initially entered, and many \
54malformed commands can silently fail when executed. If your watchpoint commands \
55do not appear to be executing, double-check the command syntax."
56 R"(
57
58)"
59 "Note: You may enter any debugger command exactly as you would at the debugger \
60prompt. There is no limit to the number of commands supplied, but do NOT enter \
61more than one command per line."
62 R"(
63
64Special information about PYTHON watchpoint commands
65----------------------------------------------------
66
67)"
68 "You may enter either one or more lines of Python, including function \
69definitions or calls to functions that will have been imported by the time \
70the code executes. Single line watchpoint commands will be interpreted 'as is' \
71when the watchpoint is hit. Multiple lines of Python will be wrapped in a \
72generated function, and a call to the function will be attached to the watchpoint."
73 R"(
74
75This auto-generated function is passed in three arguments:
76
77 frame: an lldb.SBFrame object for the frame which hit the watchpoint.
78
79 wp: the watchpoint that was hit.
80
81)"
82 "When specifying a python function with the --python-function option, you need \
83to supply the function name prepended by the module name:"
84 R"(
85
86 --python-function myutils.watchpoint_callback
87
88The function itself must have the following prototype:
89
90def watchpoint_callback(frame, wp):
91 # Your code goes here
92
93)"
94 "The arguments are the same as the arguments passed to generated functions as \
95described above. Note that the global variable 'lldb.frame' will NOT be updated when \
96this function is called, so be sure to use the 'frame' argument. The 'frame' argument \
97can get you to the thread via frame.GetThread(), the thread can get you to the \
98process via thread.GetProcess(), and the process can get you back to the target \
99via process.GetTarget()."
100 R"(
102)"
103 "Important Note: As Python code gets collected into functions, access to global \
104variables requires explicit scoping using the 'global' keyword. Be sure to use correct \
105Python syntax, including indentation, when entering Python watchpoint commands."
106 R"(
107
108Example Python one-line watchpoint command:
109
110(lldb) watchpoint command add -s python 1
111Enter your Python command(s). Type 'DONE' to end.
112> print "Hit this watchpoint!"
113> DONE
114
115As a convenience, this also works for a short Python one-liner:
116
117(lldb) watchpoint command add -s python 1 -o 'import time; print time.asctime()'
118(lldb) run
119Launching '.../a.out' (x86_64)
120(lldb) Fri Sep 10 12:17:45 2010
121Process 21778 Stopped
122* thread #1: tid = 0x2e03, 0x0000000100000de8 a.out`c + 7 at main.c:39, stop reason = watchpoint 1.1, queue = com.apple.main-thread
123 36
124 37 int c(int val)
125 38 {
126 39 -> return val + 3;
127 40 }
128 41
129 42 int main (int argc, char const *argv[])
131Example multiple line Python watchpoint command, using function definition:
132
133(lldb) watchpoint command add -s python 1
134Enter your Python command(s). Type 'DONE' to end.
135> def watchpoint_output (wp_no):
136> out_string = "Hit watchpoint number " + repr (wp_no)
137> print out_string
138> return True
139> watchpoint_output (1)
140> DONE
141
142Example multiple line Python watchpoint command, using 'loose' Python:
143
144(lldb) watchpoint command add -s p 1
145Enter your Python command(s). Type 'DONE' to end.
146> global wp_count
147> wp_count = wp_count + 1
148> print "Hit this watchpoint " + repr(wp_count) + " times!"
149> DONE
150
151)"
152 "In this case, since there is a reference to a global variable, \
153'wp_count', you will also need to make sure 'wp_count' exists and is \
154initialized:"
155 R"(
156
157(lldb) script
158>>> wp_count = 0
159>>> quit()
160
161)"
162 "Final Note: A warning that no watchpoint command was generated when there \
163are no syntax errors may indicate that a function was declared but never called.");
164
166 CommandArgumentData wp_id_arg;
167
168 // Define the first (and only) variant of this arg.
169 wp_id_arg.arg_type = eArgTypeWatchpointID;
171
172 // There is only one variant this argument could be; put it into the
173 // argument entry.
174 arg.push_back(wp_id_arg);
175
176 // Push the data for the first argument into the m_arguments vector.
177 m_arguments.push_back(arg);
178 }
179
180 ~CommandObjectWatchpointCommandAdd() override = default;
181
182 Options *GetOptions() override { return &m_options; }
183
184 void IOHandlerActivated(IOHandler &io_handler, bool interactive) override {
185 StreamFileSP output_sp(io_handler.GetOutputStreamFileSP());
186 if (output_sp && interactive) {
187 output_sp->PutCString(
188 "Enter your debugger command(s). Type 'DONE' to end.\n");
189 output_sp->Flush();
190 }
191 }
192
193 void IOHandlerInputComplete(IOHandler &io_handler,
194 std::string &line) override {
195 io_handler.SetIsDone(true);
196
197 // The WatchpointOptions object is owned by the watchpoint or watchpoint
198 // location
199 WatchpointOptions *wp_options =
200 (WatchpointOptions *)io_handler.GetUserData();
201 if (wp_options) {
202 std::unique_ptr<WatchpointOptions::CommandData> data_up(
204 if (data_up) {
205 data_up->user_source.SplitIntoLines(line);
206 auto baton_sp = std::make_shared<WatchpointOptions::CommandBaton>(
207 std::move(data_up));
209 }
210 }
211 }
212
214 CommandReturnObject &result) {
216 "> ", // Prompt
217 *this, // IOHandlerDelegate
218 wp_options); // Baton for the "io_handler" that will be passed back into
219 // our IOHandlerDelegate functions
220 }
221
222 /// Set a one-liner as the callback for the watchpoint.
224 const char *oneliner) {
225 std::unique_ptr<WatchpointOptions::CommandData> data_up(
227
228 // It's necessary to set both user_source and script_source to the
229 // oneliner. The former is used to generate callback description (as in
230 // watchpoint command list) while the latter is used for Python to
231 // interpret during the actual callback.
232 data_up->user_source.AppendString(oneliner);
233 data_up->script_source.assign(oneliner);
234 data_up->stop_on_error = m_options.m_stop_on_error;
235
236 auto baton_sp =
237 std::make_shared<WatchpointOptions::CommandBaton>(std::move(data_up));
238 wp_options->SetCallback(WatchpointOptionsCallbackFunction, baton_sp);
239 }
240
241 static bool
244 lldb::user_id_t watch_id) {
245 bool ret_value = true;
246 if (baton == nullptr)
247 return true;
248
251 StringList &commands = data->user_source;
252
253 if (commands.GetSize() > 0) {
254 ExecutionContext exe_ctx(context->exe_ctx_ref);
255 Target *target = exe_ctx.GetTargetPtr();
256 if (target) {
257 Debugger &debugger = target->GetDebugger();
258 CommandReturnObject result(debugger.GetUseColor());
259
260 // Rig up the results secondary output stream to the debugger's, so the
261 // output will come out synchronously if the debugger is set up that
262 // way.
263 StreamSP output_stream(debugger.GetAsyncOutputStream());
264 StreamSP error_stream(debugger.GetAsyncErrorStream());
265 result.SetImmediateOutputStream(output_stream);
266 result.SetImmediateErrorStream(error_stream);
267
269 options.SetStopOnContinue(true);
270 options.SetStopOnError(data->stop_on_error);
271 options.SetEchoCommands(false);
272 options.SetPrintResults(true);
273 options.SetPrintErrors(true);
274 options.SetAddToHistory(false);
276 debugger.GetCommandInterpreter().HandleCommands(commands, exe_ctx,
277 options, result);
278 result.GetImmediateOutputStream()->Flush();
279 result.GetImmediateErrorStream()->Flush();
282 return ret_value;
283 }
284
285 class CommandOptions : public Options {
286 public:
287 CommandOptions() = default;
288
289 ~CommandOptions() override = default;
290
291 Status SetOptionValue(uint32_t option_idx, llvm::StringRef option_arg,
292 ExecutionContext *execution_context) override {
294 const int short_option = m_getopt_table[option_idx].val;
295
296 switch (short_option) {
297 case 'o':
298 m_use_one_liner = true;
299 m_one_liner = std::string(option_arg);
300 break;
301
302 case 's':
304 option_arg, GetDefinitions()[option_idx].enum_values,
306
307 switch (m_script_language) {
311 break;
314 m_use_script_language = false;
315 break;
316 }
317 break;
318
319 case 'e': {
320 bool success = false;
322 OptionArgParser::ToBoolean(option_arg, false, &success);
323 if (!success)
324 error.SetErrorStringWithFormat(
325 "invalid value for stop-on-error: \"%s\"",
326 option_arg.str().c_str());
327 } break;
328
329 case 'F':
330 m_use_one_liner = false;
331 m_function_name.assign(std::string(option_arg));
332 break;
333
334 default:
335 llvm_unreachable("Unimplemented option");
336 }
337 return error;
338 }
339
340 void OptionParsingStarting(ExecutionContext *execution_context) override {
341 m_use_commands = true;
342 m_use_script_language = false;
344
345 m_use_one_liner = false;
346 m_stop_on_error = true;
347 m_one_liner.clear();
348 m_function_name.clear();
349 }
350
351 llvm::ArrayRef<OptionDefinition> GetDefinitions() override {
352 return llvm::ArrayRef(g_watchpoint_command_add_options);
353 }
354
355 // Instance variables to hold the values for command options.
356
357 bool m_use_commands = false;
358 bool m_use_script_language = false;
360
361 // Instance variables to hold the values for one_liner options.
362 bool m_use_one_liner = false;
363 std::string m_one_liner;
364 bool m_stop_on_error;
365 std::string m_function_name;
366 };
367
368protected:
369 bool DoExecute(Args &command, CommandReturnObject &result) override {
370 Target *target = &GetSelectedTarget();
371
372 const WatchpointList &watchpoints = target->GetWatchpointList();
373 size_t num_watchpoints = watchpoints.GetSize();
374
375 if (num_watchpoints == 0) {
376 result.AppendError("No watchpoints exist to have commands added");
377 return false;
378 }
379
380 if (!m_options.m_function_name.empty()) {
384 }
385 }
386
387 std::vector<uint32_t> valid_wp_ids;
389 valid_wp_ids)) {
390 result.AppendError("Invalid watchpoints specification.");
391 return false;
392 }
393
395 const size_t count = valid_wp_ids.size();
396 for (size_t i = 0; i < count; ++i) {
397 uint32_t cur_wp_id = valid_wp_ids.at(i);
398 if (cur_wp_id != LLDB_INVALID_WATCH_ID) {
399 Watchpoint *wp = target->GetWatchpointList().FindByID(cur_wp_id).get();
400 // Sanity check wp first.
401 if (wp == nullptr)
402 continue;
403
404 WatchpointOptions *wp_options = wp->GetOptions();
405 // Skip this watchpoint if wp_options is not good.
406 if (wp_options == nullptr)
407 continue;
408
409 // If we are using script language, get the script interpreter in order
410 // to set or collect command callback. Otherwise, call the methods
411 // associated with this object.
414 /*can_create=*/true, m_options.m_script_language);
415 // Special handling for one-liner specified inline.
417 script_interp->SetWatchpointCommandCallback(
418 wp_options, m_options.m_one_liner.c_str());
419 }
420 // Special handling for using a Python function by name instead of
421 // extending the watchpoint callback data structures, we just
422 // automatize what the user would do manually: make their watchpoint
423 // command be a function call
424 else if (!m_options.m_function_name.empty()) {
425 std::string oneliner(m_options.m_function_name);
426 oneliner += "(frame, wp, internal_dict)";
427 script_interp->SetWatchpointCommandCallback(
428 wp_options, oneliner.c_str());
429 } else {
430 script_interp->CollectDataForWatchpointCommandCallback(wp_options,
431 result);
432 }
433 } else {
434 // Special handling for one-liner specified inline.
437 m_options.m_one_liner.c_str());
438 else
439 CollectDataForWatchpointCommandCallback(wp_options, result);
440 }
441 }
442 }
443
444 return result.Succeeded();
445 }
446
447private:
448 CommandOptions m_options;
449};
450
451// CommandObjectWatchpointCommandDelete
452
454public:
456 : CommandObjectParsed(interpreter, "delete",
457 "Delete the set of commands from a watchpoint.",
458 nullptr, eCommandRequiresTarget) {
460 CommandArgumentData wp_id_arg;
461
462 // Define the first (and only) variant of this arg.
463 wp_id_arg.arg_type = eArgTypeWatchpointID;
465
466 // There is only one variant this argument could be; put it into the
467 // argument entry.
468 arg.push_back(wp_id_arg);
469
470 // Push the data for the first argument into the m_arguments vector.
471 m_arguments.push_back(arg);
472 }
473
475
476protected:
477 bool DoExecute(Args &command, CommandReturnObject &result) override {
478 Target *target = &GetSelectedTarget();
479
480 const WatchpointList &watchpoints = target->GetWatchpointList();
481 size_t num_watchpoints = watchpoints.GetSize();
482
483 if (num_watchpoints == 0) {
484 result.AppendError("No watchpoints exist to have commands deleted");
485 return false;
486 }
487
488 if (command.GetArgumentCount() == 0) {
489 result.AppendError(
490 "No watchpoint specified from which to delete the commands");
491 return false;
492 }
493
494 std::vector<uint32_t> valid_wp_ids;
496 valid_wp_ids)) {
497 result.AppendError("Invalid watchpoints specification.");
498 return false;
499 }
500
502 const size_t count = valid_wp_ids.size();
503 for (size_t i = 0; i < count; ++i) {
504 uint32_t cur_wp_id = valid_wp_ids.at(i);
505 if (cur_wp_id != LLDB_INVALID_WATCH_ID) {
506 Watchpoint *wp = target->GetWatchpointList().FindByID(cur_wp_id).get();
507 if (wp)
508 wp->ClearCallback();
509 } else {
510 result.AppendErrorWithFormat("Invalid watchpoint ID: %u.\n", cur_wp_id);
511 return false;
512 }
513 }
514 return result.Succeeded();
515 }
516};
517
518// CommandObjectWatchpointCommandList
519
521public:
523 : CommandObjectParsed(interpreter, "list",
524 "List the script or set of commands to be executed "
525 "when the watchpoint is hit.",
526 nullptr, eCommandRequiresTarget) {
528 CommandArgumentData wp_id_arg;
529
530 // Define the first (and only) variant of this arg.
531 wp_id_arg.arg_type = eArgTypeWatchpointID;
533
534 // There is only one variant this argument could be; put it into the
535 // argument entry.
536 arg.push_back(wp_id_arg);
537
538 // Push the data for the first argument into the m_arguments vector.
539 m_arguments.push_back(arg);
540 }
541
543
544protected:
545 bool DoExecute(Args &command, CommandReturnObject &result) override {
546 Target *target = &GetSelectedTarget();
547
548 const WatchpointList &watchpoints = target->GetWatchpointList();
549 size_t num_watchpoints = watchpoints.GetSize();
550
551 if (num_watchpoints == 0) {
552 result.AppendError("No watchpoints exist for which to list commands");
553 return false;
554 }
555
556 if (command.GetArgumentCount() == 0) {
557 result.AppendError(
558 "No watchpoint specified for which to list the commands");
559 return false;
560 }
561
562 std::vector<uint32_t> valid_wp_ids;
564 valid_wp_ids)) {
565 result.AppendError("Invalid watchpoints specification.");
566 return false;
567 }
568
570 const size_t count = valid_wp_ids.size();
571 for (size_t i = 0; i < count; ++i) {
572 uint32_t cur_wp_id = valid_wp_ids.at(i);
573 if (cur_wp_id != LLDB_INVALID_WATCH_ID) {
574 Watchpoint *wp = target->GetWatchpointList().FindByID(cur_wp_id).get();
575
576 if (wp) {
577 const WatchpointOptions *wp_options = wp->GetOptions();
578 if (wp_options) {
579 // Get the callback baton associated with the current watchpoint.
580 const Baton *baton = wp_options->GetBaton();
581 if (baton) {
582 result.GetOutputStream().Printf("Watchpoint %u:\n", cur_wp_id);
586 2);
587 } else {
589 "Watchpoint %u does not have an associated command.\n",
590 cur_wp_id);
591 }
592 }
594 } else {
595 result.AppendErrorWithFormat("Invalid watchpoint ID: %u.\n",
596 cur_wp_id);
597 }
598 }
599 }
600
601 return result.Succeeded();
602 }
603};
604
605// CommandObjectWatchpointCommand
606
608 CommandInterpreter &interpreter)
610 interpreter, "command",
611 "Commands for adding, removing and examining LLDB commands "
612 "executed when the watchpoint is hit (watchpoint 'commands').",
613 "command <sub-command> [<sub-command-options>] <watchpoint-id>") {
614 CommandObjectSP add_command_object(
615 new CommandObjectWatchpointCommandAdd(interpreter));
616 CommandObjectSP delete_command_object(
617 new CommandObjectWatchpointCommandDelete(interpreter));
618 CommandObjectSP list_command_object(
619 new CommandObjectWatchpointCommandList(interpreter));
620
621 add_command_object->SetCommandName("watchpoint command add");
622 delete_command_object->SetCommandName("watchpoint command delete");
623 list_command_object->SetCommandName("watchpoint command list");
624
625 LoadSubCommand("add", add_command_object);
626 LoadSubCommand("delete", delete_command_object);
627 LoadSubCommand("list", list_command_object);
628}
629
static llvm::raw_ostream & error(Stream &strm)
void OptionParsingStarting(ExecutionContext *execution_context) override
llvm::ArrayRef< OptionDefinition > GetDefinitions() override
Status SetOptionValue(uint32_t option_idx, llvm::StringRef option_arg, ExecutionContext *execution_context) override
Set the value of an option.
void SetWatchpointCommandCallback(WatchpointOptions *wp_options, const char *oneliner)
Set a one-liner as the callback for the watchpoint.
CommandObjectWatchpointCommandAdd(CommandInterpreter &interpreter)
bool DoExecute(Args &command, CommandReturnObject &result) override
static bool WatchpointOptionsCallbackFunction(void *baton, StoppointCallbackContext *context, lldb::user_id_t watch_id)
~CommandObjectWatchpointCommandAdd() override=default
void IOHandlerActivated(IOHandler &io_handler, bool interactive) override
void IOHandlerInputComplete(IOHandler &io_handler, std::string &line) override
Called when a line or lines have been retrieved.
void CollectDataForWatchpointCommandCallback(WatchpointOptions *wp_options, CommandReturnObject &result)
CommandObjectWatchpointCommandDelete(CommandInterpreter &interpreter)
bool DoExecute(Args &command, CommandReturnObject &result) override
~CommandObjectWatchpointCommandDelete() override=default
CommandObjectWatchpointCommandList(CommandInterpreter &interpreter)
bool DoExecute(Args &command, CommandReturnObject &result) override
~CommandObjectWatchpointCommandList() override=default
A command line argument class.
Definition: Args.h:33
size_t GetArgumentCount() const
Gets the number of arguments left in this command object.
Definition: Args.h:116
A class designed to wrap callback batons so they can cleanup any acquired resources.
Definition: Baton.h:35
virtual void GetDescription(llvm::raw_ostream &s, lldb::DescriptionLevel level, unsigned indentation) const =0
void SetStopOnContinue(bool stop_on_continue)
void GetLLDBCommandsFromIOHandler(const char *prompt, IOHandlerDelegate &delegate, void *baton=nullptr)
void HandleCommands(const StringList &commands, const ExecutionContext &context, const CommandInterpreterRunOptions &options, CommandReturnObject &result)
Execute a list of commands in sequence.
static bool VerifyWatchpointIDs(Target *target, Args &args, std::vector< uint32_t > &wp_ids)
bool LoadSubCommand(llvm::StringRef cmd_name, const lldb::CommandObjectSP &command_obj) override
std::vector< CommandArgumentData > CommandArgumentEntry
virtual void SetHelpLong(llvm::StringRef str)
std::vector< CommandArgumentEntry > m_arguments
CommandInterpreter & m_interpreter
void void AppendError(llvm::StringRef in_string)
void SetStatus(lldb::ReturnStatus status)
void AppendErrorWithFormat(const char *format,...) __attribute__((format(printf
void AppendMessageWithFormat(const char *format,...) __attribute__((format(printf
A class to manage flag bits.
Definition: Debugger.h:77
lldb::StreamSP GetAsyncOutputStream()
Definition: Debugger.cpp:1193
CommandInterpreter & GetCommandInterpreter()
Definition: Debugger.h:170
bool GetUseColor() const
Definition: Debugger.cpp:376
lldb::StreamSP GetAsyncErrorStream()
Definition: Debugger.cpp:1197
lldb::ScriptLanguage GetScriptLanguage() const
Definition: Debugger.cpp:325
ScriptInterpreter * GetScriptInterpreter(bool can_create=true, std::optional< lldb::ScriptLanguage > language={})
Definition: Debugger.cpp:1496
"lldb/Target/ExecutionContext.h" A class that contains an execution context.
A delegate class for use with IOHandler subclasses.
Definition: IOHandler.h:191
lldb::StreamFileSP GetOutputStreamFileSP()
Definition: IOHandler.cpp:105
void SetIsDone(bool b)
Definition: IOHandler.h:87
A command line option parsing protocol class.
Definition: Options.h:57
std::vector< Option > m_getopt_table
Definition: Options.h:197
virtual void SetWatchpointCommandCallback(WatchpointOptions *wp_options, const char *oneliner)
Set a one-liner as the callback for the watchpoint.
virtual void CollectDataForWatchpointCommandCallback(WatchpointOptions *wp_options, CommandReturnObject &result)
An error handling class.
Definition: Status.h:44
General Outline: When we hit a breakpoint we need to package up whatever information is needed to eva...
llvm::raw_ostream & AsRawOstream()
Returns a raw_ostream that forwards the data to this Stream object.
Definition: Stream.h:357
size_t Printf(const char *format,...) __attribute__((format(printf
Output printf formatted output to the stream.
Definition: Stream.cpp:107
unsigned GetIndentLevel() const
Get the current indentation level.
Definition: Stream.cpp:160
size_t GetSize() const
Definition: StringList.cpp:74
Debugger & GetDebugger()
Definition: Target.h:1029
WatchpointList & GetWatchpointList()
Definition: Target.h:740
This class is used by Watchpoint to manage a list of watchpoints,.
lldb::WatchpointSP FindByID(lldb::watch_id_t watchID) const
Returns a shared pointer to the watchpoint with id watchID, const version.
size_t GetSize() const
Returns the number of elements in this watchpoint list.
"lldb/Breakpoint/WatchpointOptions.h" Class that manages the options on a watchpoint.
void SetCallback(WatchpointHitCallback callback, const lldb::BatonSP &baton_sp, bool synchronous=false)
Adds a callback to the watchpoint option set.
Baton * GetBaton()
Fetch the baton from the callback.
WatchpointOptions * GetOptions()
Returns the WatchpointOptions structure set for this watchpoint.
Definition: Watchpoint.h:104
#define LLDB_INVALID_WATCH_ID
Definition: lldb-defines.h:43
A class that represents a running process on the host machine.
Definition: SBAddress.h:15
ScriptLanguage
Script interpreter types.
@ eScriptLanguageUnknown
@ eScriptLanguageLua
@ eScriptLanguageNone
@ eScriptLanguagePython
@ eDescriptionLevelFull
@ eReturnStatusSuccessFinishResult
@ eReturnStatusSuccessFinishNoResult
@ eArgTypeWatchpointID
uint64_t user_id_t
Definition: lldb-types.h:84
Used to build individual command argument lists.
Definition: CommandObject.h:93
static int64_t ToOptionEnum(llvm::StringRef s, const OptionEnumValues &enum_values, int32_t fail_value, Status &error)
static bool ToBoolean(llvm::StringRef s, bool fail_value, bool *success_ptr)