1 //===-- CommandLine.cpp - Command line parser implementation --------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This class implements a command line argument processor that is useful when
11 // creating a tool. It provides a simple, minimalistic interface that is easily
12 // extensible and supports nonlocal (library) command line options.
14 // Note that rather than trying to figure out what this code does, you could try
15 // reading the library documentation located in docs/CommandLine.html
17 //===----------------------------------------------------------------------===//
19 #include "llvm/Config/config.h"
20 #include "llvm/Support/CommandLine.h"
21 #include "llvm/System/Path.h"
34 // Globals for name and overview of program
35 static std::string ProgramName ( "<premain>" );
36 static const char *ProgramOverview = 0;
38 // This collects additional help to be printed.
39 static std::vector<const char*> &MoreHelp() {
40 static std::vector<const char*> moreHelp;
44 extrahelp::extrahelp(const char* Help)
46 MoreHelp().push_back(Help);
49 //===----------------------------------------------------------------------===//
50 // Basic, shared command line option processing machinery...
53 // Return the global command line option vector. Making it a function scoped
54 // static ensures that it will be initialized correctly before its first use.
56 static std::map<std::string, Option*> &getOpts() {
57 static std::map<std::string, Option*> CommandLineOptions;
58 return CommandLineOptions;
61 static Option *getOption(const std::string &Str) {
62 std::map<std::string,Option*>::iterator I = getOpts().find(Str);
63 return I != getOpts().end() ? I->second : 0;
66 static std::vector<Option*> &getPositionalOpts() {
67 static std::vector<Option*> Positional;
71 static void AddArgument(const char *ArgName, Option *Opt) {
72 if (getOption(ArgName)) {
73 std::cerr << ProgramName << ": CommandLine Error: Argument '"
74 << ArgName << "' defined more than once!\n";
76 // Add argument to the argument map!
77 getOpts()[ArgName] = Opt;
81 // RemoveArgument - It's possible that the argument is no longer in the map if
82 // options have already been processed and the map has been deleted!
84 static void RemoveArgument(const char *ArgName, Option *Opt) {
85 if(getOpts().empty()) return;
88 // This disgusting HACK is brought to you courtesy of GCC 3.3.2, which ICE's
89 // If we pass ArgName directly into getOption here.
90 std::string Tmp = ArgName;
91 assert(getOption(Tmp) == Opt && "Arg not in map!");
93 getOpts().erase(ArgName);
96 static inline bool ProvideOption(Option *Handler, const char *ArgName,
97 const char *Value, int argc, char **argv,
99 // Enforce value requirements
100 switch (Handler->getValueExpectedFlag()) {
102 if (Value == 0) { // No value specified?
103 if (i+1 < argc) { // Steal the next argument, like for '-o filename'
106 return Handler->error(" requires a value!");
110 case ValueDisallowed:
112 return Handler->error(" does not allow a value! '" +
113 std::string(Value) + "' specified.");
118 std::cerr << ProgramName
119 << ": Bad ValueMask flag! CommandLine usage error:"
120 << Handler->getValueExpectedFlag() << "\n";
125 // Run the handler now!
126 return Handler->addOccurrence(i, ArgName, Value ? Value : "");
129 static bool ProvidePositionalOption(Option *Handler, const std::string &Arg,
132 return ProvideOption(Handler, Handler->ArgStr, Arg.c_str(), 0, 0, Dummy);
136 // Option predicates...
137 static inline bool isGrouping(const Option *O) {
138 return O->getFormattingFlag() == cl::Grouping;
140 static inline bool isPrefixedOrGrouping(const Option *O) {
141 return isGrouping(O) || O->getFormattingFlag() == cl::Prefix;
144 // getOptionPred - Check to see if there are any options that satisfy the
145 // specified predicate with names that are the prefixes in Name. This is
146 // checked by progressively stripping characters off of the name, checking to
147 // see if there options that satisfy the predicate. If we find one, return it,
148 // otherwise return null.
150 static Option *getOptionPred(std::string Name, unsigned &Length,
151 bool (*Pred)(const Option*)) {
153 Option *Op = getOption(Name);
154 if (Op && Pred(Op)) {
155 Length = Name.length();
159 if (Name.size() == 1) return 0;
161 Name.erase(Name.end()-1, Name.end()); // Chop off the last character...
162 Op = getOption(Name);
164 // Loop while we haven't found an option and Name still has at least two
165 // characters in it (so that the next iteration will not be the empty
167 } while ((Op == 0 || !Pred(Op)) && Name.size() > 1);
169 if (Op && Pred(Op)) {
170 Length = Name.length();
171 return Op; // Found one!
173 return 0; // No option found!
176 static bool RequiresValue(const Option *O) {
177 return O->getNumOccurrencesFlag() == cl::Required ||
178 O->getNumOccurrencesFlag() == cl::OneOrMore;
181 static bool EatsUnboundedNumberOfValues(const Option *O) {
182 return O->getNumOccurrencesFlag() == cl::ZeroOrMore ||
183 O->getNumOccurrencesFlag() == cl::OneOrMore;
186 /// ParseCStringVector - Break INPUT up wherever one or more
187 /// whitespace characters are found, and store the resulting tokens in
188 /// OUTPUT. The tokens stored in OUTPUT are dynamically allocated
189 /// using strdup (), so it is the caller's responsibility to free ()
192 static void ParseCStringVector (std::vector<char *> &output,
194 // Characters which will be treated as token separators:
195 static const char *delims = " \v\f\t\r\n";
197 std::string work (input);
198 // Skip past any delims at head of input string.
199 size_t pos = work.find_first_not_of (delims);
200 // If the string consists entirely of delims, then exit early.
201 if (pos == std::string::npos) return;
202 // Otherwise, jump forward to beginning of first word.
203 work = work.substr (pos);
204 // Find position of first delimiter.
205 pos = work.find_first_of (delims);
207 while (!work.empty() && pos != std::string::npos) {
208 // Everything from 0 to POS is the next word to copy.
209 output.push_back (strdup (work.substr (0,pos).c_str ()));
210 // Is there another word in the string?
211 size_t nextpos = work.find_first_not_of (delims, pos + 1);
212 if (nextpos != std::string::npos) {
213 // Yes? Then remove delims from beginning ...
214 work = work.substr (work.find_first_not_of (delims, pos + 1));
215 // and find the end of the word.
216 pos = work.find_first_of (delims);
218 // No? (Remainder of string is delims.) End the loop.
220 pos = std::string::npos;
224 // If `input' ended with non-delim char, then we'll get here with
225 // the last word of `input' in `work'; copy it now.
226 if (!work.empty ()) {
227 output.push_back (strdup (work.c_str ()));
231 /// ParseEnvironmentOptions - An alternative entry point to the
232 /// CommandLine library, which allows you to read the program's name
233 /// from the caller (as PROGNAME) and its command-line arguments from
234 /// an environment variable (whose name is given in ENVVAR).
236 void cl::ParseEnvironmentOptions(const char *progName, const char *envVar,
237 const char *Overview) {
239 assert(progName && "Program name not specified");
240 assert(envVar && "Environment variable name missing");
242 // Get the environment variable they want us to parse options out of.
243 const char *envValue = getenv (envVar);
247 // Get program's "name", which we wouldn't know without the caller
249 std::vector<char *> newArgv;
250 newArgv.push_back (strdup (progName));
252 // Parse the value of the environment variable into a "command line"
253 // and hand it off to ParseCommandLineOptions().
254 ParseCStringVector (newArgv, envValue);
255 int newArgc = newArgv.size ();
256 ParseCommandLineOptions (newArgc, &newArgv[0], Overview);
258 // Free all the strdup()ed strings.
259 for (std::vector<char *>::iterator i = newArgv.begin (), e = newArgv.end ();
265 /// LookupOption - Lookup the option specified by the specified option on the
266 /// command line. If there is a value specified (after an equal sign) return
268 static Option *LookupOption(const char *&Arg, const char *&Value) {
269 while (*Arg == '-') ++Arg; // Eat leading dashes
271 const char *ArgEnd = Arg;
272 while (*ArgEnd && *ArgEnd != '=')
273 ++ArgEnd; // Scan till end of argument name.
275 if (*ArgEnd == '=') // If we have an equals sign...
276 Value = ArgEnd+1; // Get the value, not the equals
279 if (*Arg == 0) return 0;
281 // Look up the option.
282 std::map<std::string, Option*> &Opts = getOpts();
283 std::map<std::string, Option*>::iterator I =
284 Opts.find(std::string(Arg, ArgEnd));
285 return (I != Opts.end()) ? I->second : 0;
288 void cl::ParseCommandLineOptions(int &argc, char **argv,
289 const char *Overview) {
290 assert((!getOpts().empty() || !getPositionalOpts().empty()) &&
291 "No options specified, or ParseCommandLineOptions called more"
293 sys::Path progname(argv[0]);
294 ProgramName = sys::Path(argv[0]).getLast();
295 ProgramOverview = Overview;
296 bool ErrorParsing = false;
298 std::map<std::string, Option*> &Opts = getOpts();
299 std::vector<Option*> &PositionalOpts = getPositionalOpts();
301 // Check out the positional arguments to collect information about them.
302 unsigned NumPositionalRequired = 0;
304 // Determine whether or not there are an unlimited number of positionals
305 bool HasUnlimitedPositionals = false;
307 Option *ConsumeAfterOpt = 0;
308 if (!PositionalOpts.empty()) {
309 if (PositionalOpts[0]->getNumOccurrencesFlag() == cl::ConsumeAfter) {
310 assert(PositionalOpts.size() > 1 &&
311 "Cannot specify cl::ConsumeAfter without a positional argument!");
312 ConsumeAfterOpt = PositionalOpts[0];
315 // Calculate how many positional values are _required_.
316 bool UnboundedFound = false;
317 for (unsigned i = ConsumeAfterOpt != 0, e = PositionalOpts.size();
319 Option *Opt = PositionalOpts[i];
320 if (RequiresValue(Opt))
321 ++NumPositionalRequired;
322 else if (ConsumeAfterOpt) {
323 // ConsumeAfter cannot be combined with "optional" positional options
324 // unless there is only one positional argument...
325 if (PositionalOpts.size() > 2)
327 Opt->error(" error - this positional option will never be matched, "
328 "because it does not Require a value, and a "
329 "cl::ConsumeAfter option is active!");
330 } else if (UnboundedFound && !Opt->ArgStr[0]) {
331 // This option does not "require" a value... Make sure this option is
332 // not specified after an option that eats all extra arguments, or this
333 // one will never get any!
335 ErrorParsing |= Opt->error(" error - option can never match, because "
336 "another positional argument will match an "
337 "unbounded number of values, and this option"
338 " does not require a value!");
340 UnboundedFound |= EatsUnboundedNumberOfValues(Opt);
342 HasUnlimitedPositionals = UnboundedFound || ConsumeAfterOpt;
345 // PositionalVals - A vector of "positional" arguments we accumulate into
346 // the process at the end...
348 std::vector<std::pair<std::string,unsigned> > PositionalVals;
350 // If the program has named positional arguments, and the name has been run
351 // across, keep track of which positional argument was named. Otherwise put
352 // the positional args into the PositionalVals list...
353 Option *ActivePositionalArg = 0;
355 // Loop over all of the arguments... processing them.
356 bool DashDashFound = false; // Have we read '--'?
357 for (int i = 1; i < argc; ++i) {
359 const char *Value = 0;
360 const char *ArgName = "";
362 // Check to see if this is a positional argument. This argument is
363 // considered to be positional if it doesn't start with '-', if it is "-"
364 // itself, or if we have seen "--" already.
366 if (argv[i][0] != '-' || argv[i][1] == 0 || DashDashFound) {
367 // Positional argument!
368 if (ActivePositionalArg) {
369 ProvidePositionalOption(ActivePositionalArg, argv[i], i);
370 continue; // We are done!
371 } else if (!PositionalOpts.empty()) {
372 PositionalVals.push_back(std::make_pair(argv[i],i));
374 // All of the positional arguments have been fulfulled, give the rest to
375 // the consume after option... if it's specified...
377 if (PositionalVals.size() >= NumPositionalRequired &&
378 ConsumeAfterOpt != 0) {
379 for (++i; i < argc; ++i)
380 PositionalVals.push_back(std::make_pair(argv[i],i));
381 break; // Handle outside of the argument processing loop...
384 // Delay processing positional arguments until the end...
387 } else if (argv[i][0] == '-' && argv[i][1] == '-' && argv[i][2] == 0 &&
389 DashDashFound = true; // This is the mythical "--"?
390 continue; // Don't try to process it as an argument itself.
391 } else if (ActivePositionalArg &&
392 (ActivePositionalArg->getMiscFlags() & PositionalEatsArgs)) {
393 // If there is a positional argument eating options, check to see if this
394 // option is another positional argument. If so, treat it as an argument,
395 // otherwise feed it to the eating positional.
397 Handler = LookupOption(ArgName, Value);
398 if (!Handler || Handler->getFormattingFlag() != cl::Positional) {
399 ProvidePositionalOption(ActivePositionalArg, argv[i], i);
400 continue; // We are done!
403 } else { // We start with a '-', must be an argument...
405 Handler = LookupOption(ArgName, Value);
407 // Check to see if this "option" is really a prefixed or grouped argument.
409 std::string RealName(ArgName);
410 if (RealName.size() > 1) {
412 Option *PGOpt = getOptionPred(RealName, Length, isPrefixedOrGrouping);
414 // If the option is a prefixed option, then the value is simply the
415 // rest of the name... so fall through to later processing, by
416 // setting up the argument name flags and value fields.
418 if (PGOpt && PGOpt->getFormattingFlag() == cl::Prefix) {
419 Value = ArgName+Length;
420 assert(Opts.find(std::string(ArgName, Value)) != Opts.end() &&
421 Opts.find(std::string(ArgName, Value))->second == PGOpt);
424 // This must be a grouped option... handle them now.
425 assert(isGrouping(PGOpt) && "Broken getOptionPred!");
428 // Move current arg name out of RealName into RealArgName...
429 std::string RealArgName(RealName.begin(),
430 RealName.begin() + Length);
431 RealName.erase(RealName.begin(), RealName.begin() + Length);
433 // Because ValueRequired is an invalid flag for grouped arguments,
434 // we don't need to pass argc/argv in...
436 assert(PGOpt->getValueExpectedFlag() != cl::ValueRequired &&
437 "Option can not be cl::Grouping AND cl::ValueRequired!");
439 ErrorParsing |= ProvideOption(PGOpt, RealArgName.c_str(),
442 // Get the next grouping option...
443 PGOpt = getOptionPred(RealName, Length, isGrouping);
444 } while (PGOpt && Length != RealName.size());
446 Handler = PGOpt; // Ate all of the options.
453 std::cerr << ProgramName << ": Unknown command line argument '"
454 << argv[i] << "'. Try: '" << argv[0] << " --help'\n";
459 // Check to see if this option accepts a comma separated list of values. If
460 // it does, we have to split up the value into multiple values...
461 if (Value && Handler->getMiscFlags() & CommaSeparated) {
462 std::string Val(Value);
463 std::string::size_type Pos = Val.find(',');
465 while (Pos != std::string::npos) {
466 // Process the portion before the comma...
467 ErrorParsing |= ProvideOption(Handler, ArgName,
468 std::string(Val.begin(),
469 Val.begin()+Pos).c_str(),
471 // Erase the portion before the comma, AND the comma...
472 Val.erase(Val.begin(), Val.begin()+Pos+1);
473 Value += Pos+1; // Increment the original value pointer as well...
475 // Check for another comma...
480 // If this is a named positional argument, just remember that it is the
482 if (Handler->getFormattingFlag() == cl::Positional)
483 ActivePositionalArg = Handler;
485 ErrorParsing |= ProvideOption(Handler, ArgName, Value, argc, argv, i);
488 // Check and handle positional arguments now...
489 if (NumPositionalRequired > PositionalVals.size()) {
490 std::cerr << ProgramName
491 << ": Not enough positional command line arguments specified!\n"
492 << "Must specify at least " << NumPositionalRequired
493 << " positional arguments: See: " << argv[0] << " --help\n";
496 } else if (!HasUnlimitedPositionals
497 && PositionalVals.size() > PositionalOpts.size()) {
498 std::cerr << ProgramName
499 << ": Too many positional arguments specified!\n"
500 << "Can specify at most " << PositionalOpts.size()
501 << " positional arguments: See: " << argv[0] << " --help\n";
504 } else if (ConsumeAfterOpt == 0) {
505 // Positional args have already been handled if ConsumeAfter is specified...
506 unsigned ValNo = 0, NumVals = PositionalVals.size();
507 for (unsigned i = 0, e = PositionalOpts.size(); i != e; ++i) {
508 if (RequiresValue(PositionalOpts[i])) {
509 ProvidePositionalOption(PositionalOpts[i], PositionalVals[ValNo].first,
510 PositionalVals[ValNo].second);
512 --NumPositionalRequired; // We fulfilled our duty...
515 // If we _can_ give this option more arguments, do so now, as long as we
516 // do not give it values that others need. 'Done' controls whether the
517 // option even _WANTS_ any more.
519 bool Done = PositionalOpts[i]->getNumOccurrencesFlag() == cl::Required;
520 while (NumVals-ValNo > NumPositionalRequired && !Done) {
521 switch (PositionalOpts[i]->getNumOccurrencesFlag()) {
523 Done = true; // Optional arguments want _at most_ one value
525 case cl::ZeroOrMore: // Zero or more will take all they can get...
526 case cl::OneOrMore: // One or more will take all they can get...
527 ProvidePositionalOption(PositionalOpts[i],
528 PositionalVals[ValNo].first,
529 PositionalVals[ValNo].second);
533 assert(0 && "Internal error, unexpected NumOccurrences flag in "
534 "positional argument processing!");
539 assert(ConsumeAfterOpt && NumPositionalRequired <= PositionalVals.size());
541 for (unsigned j = 1, e = PositionalOpts.size(); j != e; ++j)
542 if (RequiresValue(PositionalOpts[j])) {
543 ErrorParsing |= ProvidePositionalOption(PositionalOpts[j],
544 PositionalVals[ValNo].first,
545 PositionalVals[ValNo].second);
549 // Handle the case where there is just one positional option, and it's
550 // optional. In this case, we want to give JUST THE FIRST option to the
551 // positional option and keep the rest for the consume after. The above
552 // loop would have assigned no values to positional options in this case.
554 if (PositionalOpts.size() == 2 && ValNo == 0 && !PositionalVals.empty()) {
555 ErrorParsing |= ProvidePositionalOption(PositionalOpts[1],
556 PositionalVals[ValNo].first,
557 PositionalVals[ValNo].second);
561 // Handle over all of the rest of the arguments to the
562 // cl::ConsumeAfter command line option...
563 for (; ValNo != PositionalVals.size(); ++ValNo)
564 ErrorParsing |= ProvidePositionalOption(ConsumeAfterOpt,
565 PositionalVals[ValNo].first,
566 PositionalVals[ValNo].second);
569 // Loop over args and make sure all required args are specified!
570 for (std::map<std::string, Option*>::iterator I = Opts.begin(),
571 E = Opts.end(); I != E; ++I) {
572 switch (I->second->getNumOccurrencesFlag()) {
575 if (I->second->getNumOccurrences() == 0) {
576 I->second->error(" must be specified at least once!");
585 // Free all of the memory allocated to the map. Command line options may only
586 // be processed once!
588 PositionalOpts.clear();
591 // If we had an error processing our arguments, don't let the program execute
592 if (ErrorParsing) exit(1);
595 //===----------------------------------------------------------------------===//
596 // Option Base class implementation
599 // Out of line virtual function to provide home for the class.
600 void Option::anchor() {
603 bool Option::error(std::string Message, const char *ArgName) {
604 if (ArgName == 0) ArgName = ArgStr;
606 std::cerr << HelpStr; // Be nice for positional arguments
608 std::cerr << ProgramName << ": for the -" << ArgName;
610 std::cerr << " option: " << Message << "\n";
614 bool Option::addOccurrence(unsigned pos, const char *ArgName,
615 const std::string &Value) {
616 NumOccurrences++; // Increment the number of times we have been seen
618 switch (getNumOccurrencesFlag()) {
620 if (NumOccurrences > 1)
621 return error(": may only occur zero or one times!", ArgName);
624 if (NumOccurrences > 1)
625 return error(": must occur exactly one time!", ArgName);
629 case ConsumeAfter: break;
630 default: return error(": bad num occurrences flag value!");
633 return handleOccurrence(pos, ArgName, Value);
636 // addArgument - Tell the system that this Option subclass will handle all
637 // occurrences of -ArgStr on the command line.
639 void Option::addArgument(const char *ArgStr) {
641 AddArgument(ArgStr, this);
643 if (getFormattingFlag() == Positional)
644 getPositionalOpts().push_back(this);
645 else if (getNumOccurrencesFlag() == ConsumeAfter) {
646 if (!getPositionalOpts().empty() &&
647 getPositionalOpts().front()->getNumOccurrencesFlag() == ConsumeAfter)
648 error("Cannot specify more than one option with cl::ConsumeAfter!");
649 getPositionalOpts().insert(getPositionalOpts().begin(), this);
653 void Option::removeArgument(const char *ArgStr) {
655 RemoveArgument(ArgStr, this);
657 if (getFormattingFlag() == Positional) {
658 std::vector<Option*>::iterator I =
659 std::find(getPositionalOpts().begin(), getPositionalOpts().end(), this);
660 assert(I != getPositionalOpts().end() && "Arg not registered!");
661 getPositionalOpts().erase(I);
662 } else if (getNumOccurrencesFlag() == ConsumeAfter) {
663 assert(!getPositionalOpts().empty() && getPositionalOpts()[0] == this &&
664 "Arg not registered correctly!");
665 getPositionalOpts().erase(getPositionalOpts().begin());
670 // getValueStr - Get the value description string, using "DefaultMsg" if nothing
671 // has been specified yet.
673 static const char *getValueStr(const Option &O, const char *DefaultMsg) {
674 if (O.ValueStr[0] == 0) return DefaultMsg;
678 //===----------------------------------------------------------------------===//
679 // cl::alias class implementation
682 // Return the width of the option tag for printing...
683 unsigned alias::getOptionWidth() const {
684 return std::strlen(ArgStr)+6;
687 // Print out the option for the alias.
688 void alias::printOptionInfo(unsigned GlobalWidth) const {
689 unsigned L = std::strlen(ArgStr);
690 std::cout << " -" << ArgStr << std::string(GlobalWidth-L-6, ' ') << " - "
696 //===----------------------------------------------------------------------===//
697 // Parser Implementation code...
700 // basic_parser implementation
703 // Return the width of the option tag for printing...
704 unsigned basic_parser_impl::getOptionWidth(const Option &O) const {
705 unsigned Len = std::strlen(O.ArgStr);
706 if (const char *ValName = getValueName())
707 Len += std::strlen(getValueStr(O, ValName))+3;
712 // printOptionInfo - Print out information about this option. The
713 // to-be-maintained width is specified.
715 void basic_parser_impl::printOptionInfo(const Option &O,
716 unsigned GlobalWidth) const {
717 std::cout << " -" << O.ArgStr;
719 if (const char *ValName = getValueName())
720 std::cout << "=<" << getValueStr(O, ValName) << ">";
722 std::cout << std::string(GlobalWidth-getOptionWidth(O), ' ') << " - "
723 << O.HelpStr << "\n";
729 // parser<bool> implementation
731 bool parser<bool>::parse(Option &O, const char *ArgName,
732 const std::string &Arg, bool &Value) {
733 if (Arg == "" || Arg == "true" || Arg == "TRUE" || Arg == "True" ||
736 } else if (Arg == "false" || Arg == "FALSE" || Arg == "False" || Arg == "0") {
739 return O.error(": '" + Arg +
740 "' is invalid value for boolean argument! Try 0 or 1");
745 // parser<int> implementation
747 bool parser<int>::parse(Option &O, const char *ArgName,
748 const std::string &Arg, int &Value) {
750 Value = (int)strtol(Arg.c_str(), &End, 0);
752 return O.error(": '" + Arg + "' value invalid for integer argument!");
756 // parser<unsigned> implementation
758 bool parser<unsigned>::parse(Option &O, const char *ArgName,
759 const std::string &Arg, unsigned &Value) {
762 unsigned long V = strtoul(Arg.c_str(), &End, 0);
764 if (((V == ULONG_MAX) && (errno == ERANGE))
767 return O.error(": '" + Arg + "' value invalid for uint argument!");
771 // parser<double>/parser<float> implementation
773 static bool parseDouble(Option &O, const std::string &Arg, double &Value) {
774 const char *ArgStart = Arg.c_str();
776 Value = strtod(ArgStart, &End);
778 return O.error(": '" +Arg+ "' value invalid for floating point argument!");
782 bool parser<double>::parse(Option &O, const char *AN,
783 const std::string &Arg, double &Val) {
784 return parseDouble(O, Arg, Val);
787 bool parser<float>::parse(Option &O, const char *AN,
788 const std::string &Arg, float &Val) {
790 if (parseDouble(O, Arg, dVal))
798 // generic_parser_base implementation
801 // findOption - Return the option number corresponding to the specified
802 // argument string. If the option is not found, getNumOptions() is returned.
804 unsigned generic_parser_base::findOption(const char *Name) {
805 unsigned i = 0, e = getNumOptions();
809 if (getOption(i) == N)
817 // Return the width of the option tag for printing...
818 unsigned generic_parser_base::getOptionWidth(const Option &O) const {
820 unsigned Size = std::strlen(O.ArgStr)+6;
821 for (unsigned i = 0, e = getNumOptions(); i != e; ++i)
822 Size = std::max(Size, (unsigned)std::strlen(getOption(i))+8);
825 unsigned BaseSize = 0;
826 for (unsigned i = 0, e = getNumOptions(); i != e; ++i)
827 BaseSize = std::max(BaseSize, (unsigned)std::strlen(getOption(i))+8);
832 // printOptionInfo - Print out information about this option. The
833 // to-be-maintained width is specified.
835 void generic_parser_base::printOptionInfo(const Option &O,
836 unsigned GlobalWidth) const {
838 unsigned L = std::strlen(O.ArgStr);
839 std::cout << " -" << O.ArgStr << std::string(GlobalWidth-L-6, ' ')
840 << " - " << O.HelpStr << "\n";
842 for (unsigned i = 0, e = getNumOptions(); i != e; ++i) {
843 unsigned NumSpaces = GlobalWidth-strlen(getOption(i))-8;
844 std::cout << " =" << getOption(i) << std::string(NumSpaces, ' ')
845 << " - " << getDescription(i) << "\n";
849 std::cout << " " << O.HelpStr << "\n";
850 for (unsigned i = 0, e = getNumOptions(); i != e; ++i) {
851 unsigned L = std::strlen(getOption(i));
852 std::cout << " -" << getOption(i) << std::string(GlobalWidth-L-8, ' ')
853 << " - " << getDescription(i) << "\n";
859 //===----------------------------------------------------------------------===//
860 // --help and --help-hidden option implementation
867 const Option *EmptyArg;
868 const bool ShowHidden;
870 // isHidden/isReallyHidden - Predicates to be used to filter down arg lists.
871 inline static bool isHidden(std::pair<std::string, Option *> &OptPair) {
872 return OptPair.second->getOptionHiddenFlag() >= Hidden;
874 inline static bool isReallyHidden(std::pair<std::string, Option *> &OptPair) {
875 return OptPair.second->getOptionHiddenFlag() == ReallyHidden;
879 HelpPrinter(bool showHidden) : ShowHidden(showHidden) {
883 void operator=(bool Value) {
884 if (Value == false) return;
886 // Copy Options into a vector so we can sort them as we like...
887 std::vector<std::pair<std::string, Option*> > Options;
888 copy(getOpts().begin(), getOpts().end(), std::back_inserter(Options));
890 // Eliminate Hidden or ReallyHidden arguments, depending on ShowHidden
891 Options.erase(std::remove_if(Options.begin(), Options.end(),
892 std::ptr_fun(ShowHidden ? isReallyHidden : isHidden)),
895 // Eliminate duplicate entries in table (from enum flags options, f.e.)
896 { // Give OptionSet a scope
897 std::set<Option*> OptionSet;
898 for (unsigned i = 0; i != Options.size(); ++i)
899 if (OptionSet.count(Options[i].second) == 0)
900 OptionSet.insert(Options[i].second); // Add new entry to set
902 Options.erase(Options.begin()+i--); // Erase duplicate
906 std::cout << "OVERVIEW:" << ProgramOverview << "\n";
908 std::cout << "USAGE: " << ProgramName << " [options]";
910 // Print out the positional options...
911 std::vector<Option*> &PosOpts = getPositionalOpts();
912 Option *CAOpt = 0; // The cl::ConsumeAfter option, if it exists...
913 if (!PosOpts.empty() && PosOpts[0]->getNumOccurrencesFlag() == ConsumeAfter)
916 for (unsigned i = CAOpt != 0, e = PosOpts.size(); i != e; ++i) {
917 if (PosOpts[i]->ArgStr[0])
918 std::cout << " --" << PosOpts[i]->ArgStr;
919 std::cout << " " << PosOpts[i]->HelpStr;
922 // Print the consume after option info if it exists...
923 if (CAOpt) std::cout << " " << CAOpt->HelpStr;
927 // Compute the maximum argument length...
929 for (unsigned i = 0, e = Options.size(); i != e; ++i)
930 MaxArgLen = std::max(MaxArgLen, Options[i].second->getOptionWidth());
932 std::cout << "OPTIONS:\n";
933 for (unsigned i = 0, e = Options.size(); i != e; ++i)
934 Options[i].second->printOptionInfo(MaxArgLen);
936 // Print any extra help the user has declared.
937 for (std::vector<const char *>::iterator I = MoreHelp().begin(),
938 E = MoreHelp().end(); I != E; ++I)
942 // Halt the program since help information was printed
943 getOpts().clear(); // Don't bother making option dtors remove from map.
948 // Define the two HelpPrinter instances that are used to print out help, or
951 HelpPrinter NormalPrinter(false);
952 HelpPrinter HiddenPrinter(true);
954 cl::opt<HelpPrinter, true, parser<bool> >
955 HOp("help", cl::desc("Display available options (--help-hidden for more)"),
956 cl::location(NormalPrinter), cl::ValueDisallowed);
958 cl::opt<HelpPrinter, true, parser<bool> >
959 HHOp("help-hidden", cl::desc("Display all available options"),
960 cl::location(HiddenPrinter), cl::Hidden, cl::ValueDisallowed);
962 void (*OverrideVersionPrinter)() = 0;
964 class VersionPrinter {
966 void operator=(bool OptionWasSpecified) {
967 if (OptionWasSpecified) {
968 if (OverrideVersionPrinter == 0) {
969 std::cout << "Low Level Virtual Machine (http://llvm.org/):\n";
970 std::cout << " " << PACKAGE_NAME << " version " << PACKAGE_VERSION;
971 #ifdef LLVM_VERSION_INFO
972 std::cout << LLVM_VERSION_INFO;
976 std::cout << "DEBUG build";
978 std::cout << "Optimized build";
981 std::cout << " with assertions";
984 getOpts().clear(); // Don't bother making option dtors remove from map.
987 (*OverrideVersionPrinter)();
995 // Define the --version option that prints out the LLVM version for the tool
996 VersionPrinter VersionPrinterInstance;
997 cl::opt<VersionPrinter, true, parser<bool> >
998 VersOp("version", cl::desc("Display the version of this program"),
999 cl::location(VersionPrinterInstance), cl::ValueDisallowed);
1002 } // End anonymous namespace
1004 // Utility function for printing the help message.
1005 void cl::PrintHelpMessage() {
1006 // This looks weird, but it actually prints the help message. The
1007 // NormalPrinter variable is a HelpPrinter and the help gets printed when
1008 // its operator= is invoked. That's because the "normal" usages of the
1009 // help printer is to be assigned true/false depending on whether the
1010 // --help option was given or not. Since we're circumventing that we have
1011 // to make it look like --help was given, so we assign true.
1012 NormalPrinter = true;
1015 void cl::SetVersionPrinter(void (*func)()) {
1016 OverrideVersionPrinter = func;