CommandLine.h revision a460beb5cdc1cf05da3b22a39fd2b3107ea2e2fe
1//===- llvm/Support/CommandLine.h - Command line handler --------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 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. 13// 14// Note that rather than trying to figure out what this code does, you should 15// read the library documentation located in docs/CommandLine.html or looks at 16// the many example usages in tools/*/*.cpp 17// 18//===----------------------------------------------------------------------===// 19 20#ifndef LLVM_SUPPORT_COMMANDLINE_H 21#define LLVM_SUPPORT_COMMANDLINE_H 22 23#include "llvm/Support/type_traits.h" 24#include "llvm/Support/Compiler.h" 25#include "llvm/ADT/SmallVector.h" 26#include "llvm/ADT/Twine.h" 27#include <cassert> 28#include <climits> 29#include <cstdarg> 30#include <utility> 31#include <vector> 32 33namespace llvm { 34 35/// cl Namespace - This namespace contains all of the command line option 36/// processing machinery. It is intentionally a short name to make qualified 37/// usage concise. 38namespace cl { 39 40//===----------------------------------------------------------------------===// 41// ParseCommandLineOptions - Command line option processing entry point. 42// 43void ParseCommandLineOptions(int argc, char **argv, 44 const char *Overview = 0, 45 bool ReadResponseFiles = false); 46 47//===----------------------------------------------------------------------===// 48// ParseEnvironmentOptions - Environment variable option processing alternate 49// entry point. 50// 51void ParseEnvironmentOptions(const char *progName, const char *envvar, 52 const char *Overview = 0, 53 bool ReadResponseFiles = false); 54 55///===---------------------------------------------------------------------===// 56/// SetVersionPrinter - Override the default (LLVM specific) version printer 57/// used to print out the version when --version is given 58/// on the command line. This allows other systems using the 59/// CommandLine utilities to print their own version string. 60void SetVersionPrinter(void (*func)()); 61 62 63// MarkOptionsChanged - Internal helper function. 64void MarkOptionsChanged(); 65 66//===----------------------------------------------------------------------===// 67// Flags permitted to be passed to command line arguments 68// 69 70enum NumOccurrences { // Flags for the number of occurrences allowed 71 Optional = 0x01, // Zero or One occurrence 72 ZeroOrMore = 0x02, // Zero or more occurrences allowed 73 Required = 0x03, // One occurrence required 74 OneOrMore = 0x04, // One or more occurrences required 75 76 // ConsumeAfter - Indicates that this option is fed anything that follows the 77 // last positional argument required by the application (it is an error if 78 // there are zero positional arguments, and a ConsumeAfter option is used). 79 // Thus, for example, all arguments to LLI are processed until a filename is 80 // found. Once a filename is found, all of the succeeding arguments are 81 // passed, unprocessed, to the ConsumeAfter option. 82 // 83 ConsumeAfter = 0x05, 84 85 OccurrencesMask = 0x07 86}; 87 88enum ValueExpected { // Is a value required for the option? 89 ValueOptional = 0x08, // The value can appear... or not 90 ValueRequired = 0x10, // The value is required to appear! 91 ValueDisallowed = 0x18, // A value may not be specified (for flags) 92 ValueMask = 0x18 93}; 94 95enum OptionHidden { // Control whether -help shows this option 96 NotHidden = 0x20, // Option included in --help & --help-hidden 97 Hidden = 0x40, // -help doesn't, but --help-hidden does 98 ReallyHidden = 0x60, // Neither --help nor --help-hidden show this arg 99 HiddenMask = 0x60 100}; 101 102// Formatting flags - This controls special features that the option might have 103// that cause it to be parsed differently... 104// 105// Prefix - This option allows arguments that are otherwise unrecognized to be 106// matched by options that are a prefix of the actual value. This is useful for 107// cases like a linker, where options are typically of the form '-lfoo' or 108// '-L../../include' where -l or -L are the actual flags. When prefix is 109// enabled, and used, the value for the flag comes from the suffix of the 110// argument. 111// 112// Grouping - With this option enabled, multiple letter options are allowed to 113// bunch together with only a single hyphen for the whole group. This allows 114// emulation of the behavior that ls uses for example: ls -la === ls -l -a 115// 116 117enum FormattingFlags { 118 NormalFormatting = 0x000, // Nothing special 119 Positional = 0x080, // Is a positional argument, no '-' required 120 Prefix = 0x100, // Can this option directly prefix its value? 121 Grouping = 0x180, // Can this option group with other options? 122 FormattingMask = 0x180 // Union of the above flags. 123}; 124 125enum MiscFlags { // Miscellaneous flags to adjust argument 126 CommaSeparated = 0x200, // Should this cl::list split between commas? 127 PositionalEatsArgs = 0x400, // Should this positional cl::list eat -args? 128 Sink = 0x800, // Should this cl::list eat all unknown options? 129 MiscMask = 0xE00 // Union of the above flags. 130}; 131 132 133 134//===----------------------------------------------------------------------===// 135// Option Base class 136// 137class alias; 138class Option { 139 friend class alias; 140 141 // handleOccurrences - Overriden by subclasses to handle the value passed into 142 // an argument. Should return true if there was an error processing the 143 // argument and the program should exit. 144 // 145 virtual bool handleOccurrence(unsigned pos, const char *ArgName, 146 StringRef Arg) = 0; 147 148 virtual enum ValueExpected getValueExpectedFlagDefault() const { 149 return ValueOptional; 150 } 151 152 // Out of line virtual function to provide home for the class. 153 virtual void anchor(); 154 155 int NumOccurrences; // The number of times specified 156 int Flags; // Flags for the argument 157 unsigned Position; // Position of last occurrence of the option 158 unsigned AdditionalVals;// Greater than 0 for multi-valued option. 159 Option *NextRegistered; // Singly linked list of registered options. 160public: 161 const char *ArgStr; // The argument string itself (ex: "help", "o") 162 const char *HelpStr; // The descriptive text message for --help 163 const char *ValueStr; // String describing what the value of this option is 164 165 inline enum NumOccurrences getNumOccurrencesFlag() const { 166 return static_cast<enum NumOccurrences>(Flags & OccurrencesMask); 167 } 168 inline enum ValueExpected getValueExpectedFlag() const { 169 int VE = Flags & ValueMask; 170 return VE ? static_cast<enum ValueExpected>(VE) 171 : getValueExpectedFlagDefault(); 172 } 173 inline enum OptionHidden getOptionHiddenFlag() const { 174 return static_cast<enum OptionHidden>(Flags & HiddenMask); 175 } 176 inline enum FormattingFlags getFormattingFlag() const { 177 return static_cast<enum FormattingFlags>(Flags & FormattingMask); 178 } 179 inline unsigned getMiscFlags() const { 180 return Flags & MiscMask; 181 } 182 inline unsigned getPosition() const { return Position; } 183 inline unsigned getNumAdditionalVals() const { return AdditionalVals; } 184 185 // hasArgStr - Return true if the argstr != "" 186 bool hasArgStr() const { return ArgStr[0] != 0; } 187 188 //-------------------------------------------------------------------------=== 189 // Accessor functions set by OptionModifiers 190 // 191 void setArgStr(const char *S) { ArgStr = S; } 192 void setDescription(const char *S) { HelpStr = S; } 193 void setValueStr(const char *S) { ValueStr = S; } 194 195 void setFlag(unsigned Flag, unsigned FlagMask) { 196 Flags &= ~FlagMask; 197 Flags |= Flag; 198 } 199 200 void setNumOccurrencesFlag(enum NumOccurrences Val) { 201 setFlag(Val, OccurrencesMask); 202 } 203 void setValueExpectedFlag(enum ValueExpected Val) { setFlag(Val, ValueMask); } 204 void setHiddenFlag(enum OptionHidden Val) { setFlag(Val, HiddenMask); } 205 void setFormattingFlag(enum FormattingFlags V) { setFlag(V, FormattingMask); } 206 void setMiscFlag(enum MiscFlags M) { setFlag(M, M); } 207 void setPosition(unsigned pos) { Position = pos; } 208protected: 209 explicit Option(unsigned DefaultFlags) 210 : NumOccurrences(0), Flags(DefaultFlags | NormalFormatting), Position(0), 211 AdditionalVals(0), NextRegistered(0), 212 ArgStr(""), HelpStr(""), ValueStr("") { 213 assert(getNumOccurrencesFlag() != 0 && 214 getOptionHiddenFlag() != 0 && "Not all default flags specified!"); 215 } 216 217 inline void setNumAdditionalVals(unsigned n) { AdditionalVals = n; } 218public: 219 // addArgument - Register this argument with the commandline system. 220 // 221 void addArgument(); 222 223 Option *getNextRegisteredOption() const { return NextRegistered; } 224 225 // Return the width of the option tag for printing... 226 virtual size_t getOptionWidth() const = 0; 227 228 // printOptionInfo - Print out information about this option. The 229 // to-be-maintained width is specified. 230 // 231 virtual void printOptionInfo(size_t GlobalWidth) const = 0; 232 233 virtual void getExtraOptionNames(std::vector<const char*> &) {} 234 235 // addOccurrence - Wrapper around handleOccurrence that enforces Flags 236 // 237 bool addOccurrence(unsigned pos, const char *ArgName, 238 StringRef Value, bool MultiArg = false); 239 240 // Prints option name followed by message. Always returns true. 241 bool error(const Twine &Message, const char *ArgName = 0); 242 243public: 244 inline int getNumOccurrences() const { return NumOccurrences; } 245 virtual ~Option() {} 246}; 247 248 249//===----------------------------------------------------------------------===// 250// Command line option modifiers that can be used to modify the behavior of 251// command line option parsers... 252// 253 254// desc - Modifier to set the description shown in the --help output... 255struct desc { 256 const char *Desc; 257 desc(const char *Str) : Desc(Str) {} 258 void apply(Option &O) const { O.setDescription(Desc); } 259}; 260 261// value_desc - Modifier to set the value description shown in the --help 262// output... 263struct value_desc { 264 const char *Desc; 265 value_desc(const char *Str) : Desc(Str) {} 266 void apply(Option &O) const { O.setValueStr(Desc); } 267}; 268 269// init - Specify a default (initial) value for the command line argument, if 270// the default constructor for the argument type does not give you what you 271// want. This is only valid on "opt" arguments, not on "list" arguments. 272// 273template<class Ty> 274struct initializer { 275 const Ty &Init; 276 initializer(const Ty &Val) : Init(Val) {} 277 278 template<class Opt> 279 void apply(Opt &O) const { O.setInitialValue(Init); } 280}; 281 282template<class Ty> 283initializer<Ty> init(const Ty &Val) { 284 return initializer<Ty>(Val); 285} 286 287 288// location - Allow the user to specify which external variable they want to 289// store the results of the command line argument processing into, if they don't 290// want to store it in the option itself. 291// 292template<class Ty> 293struct LocationClass { 294 Ty &Loc; 295 LocationClass(Ty &L) : Loc(L) {} 296 297 template<class Opt> 298 void apply(Opt &O) const { O.setLocation(O, Loc); } 299}; 300 301template<class Ty> 302LocationClass<Ty> location(Ty &L) { return LocationClass<Ty>(L); } 303 304 305//===----------------------------------------------------------------------===// 306// Enum valued command line option 307// 308#define clEnumVal(ENUMVAL, DESC) #ENUMVAL, int(ENUMVAL), DESC 309#define clEnumValN(ENUMVAL, FLAGNAME, DESC) FLAGNAME, int(ENUMVAL), DESC 310#define clEnumValEnd (reinterpret_cast<void*>(0)) 311 312// values - For custom data types, allow specifying a group of values together 313// as the values that go into the mapping that the option handler uses. Note 314// that the values list must always have a 0 at the end of the list to indicate 315// that the list has ended. 316// 317template<class DataType> 318class ValuesClass { 319 // Use a vector instead of a map, because the lists should be short, 320 // the overhead is less, and most importantly, it keeps them in the order 321 // inserted so we can print our option out nicely. 322 SmallVector<std::pair<const char *, std::pair<int, const char *> >,4> Values; 323 void processValues(va_list Vals); 324public: 325 ValuesClass(const char *EnumName, DataType Val, const char *Desc, 326 va_list ValueArgs) { 327 // Insert the first value, which is required. 328 Values.push_back(std::make_pair(EnumName, std::make_pair(Val, Desc))); 329 330 // Process the varargs portion of the values... 331 while (const char *enumName = va_arg(ValueArgs, const char *)) { 332 DataType EnumVal = static_cast<DataType>(va_arg(ValueArgs, int)); 333 const char *EnumDesc = va_arg(ValueArgs, const char *); 334 Values.push_back(std::make_pair(enumName, // Add value to value map 335 std::make_pair(EnumVal, EnumDesc))); 336 } 337 } 338 339 template<class Opt> 340 void apply(Opt &O) const { 341 for (unsigned i = 0, e = static_cast<unsigned>(Values.size()); 342 i != e; ++i) 343 O.getParser().addLiteralOption(Values[i].first, Values[i].second.first, 344 Values[i].second.second); 345 } 346}; 347 348template<class DataType> 349ValuesClass<DataType> END_WITH_NULL values(const char *Arg, DataType Val, 350 const char *Desc, ...) { 351 va_list ValueArgs; 352 va_start(ValueArgs, Desc); 353 ValuesClass<DataType> Vals(Arg, Val, Desc, ValueArgs); 354 va_end(ValueArgs); 355 return Vals; 356} 357 358 359//===----------------------------------------------------------------------===// 360// parser class - Parameterizable parser for different data types. By default, 361// known data types (string, int, bool) have specialized parsers, that do what 362// you would expect. The default parser, used for data types that are not 363// built-in, uses a mapping table to map specific options to values, which is 364// used, among other things, to handle enum types. 365 366//-------------------------------------------------- 367// generic_parser_base - This class holds all the non-generic code that we do 368// not need replicated for every instance of the generic parser. This also 369// allows us to put stuff into CommandLine.cpp 370// 371struct generic_parser_base { 372 virtual ~generic_parser_base() {} // Base class should have virtual-dtor 373 374 // getNumOptions - Virtual function implemented by generic subclass to 375 // indicate how many entries are in Values. 376 // 377 virtual unsigned getNumOptions() const = 0; 378 379 // getOption - Return option name N. 380 virtual const char *getOption(unsigned N) const = 0; 381 382 // getDescription - Return description N 383 virtual const char *getDescription(unsigned N) const = 0; 384 385 // Return the width of the option tag for printing... 386 virtual size_t getOptionWidth(const Option &O) const; 387 388 // printOptionInfo - Print out information about this option. The 389 // to-be-maintained width is specified. 390 // 391 virtual void printOptionInfo(const Option &O, size_t GlobalWidth) const; 392 393 void initialize(Option &O) { 394 // All of the modifiers for the option have been processed by now, so the 395 // argstr field should be stable, copy it down now. 396 // 397 hasArgStr = O.hasArgStr(); 398 } 399 400 void getExtraOptionNames(std::vector<const char*> &OptionNames) { 401 // If there has been no argstr specified, that means that we need to add an 402 // argument for every possible option. This ensures that our options are 403 // vectored to us. 404 if (!hasArgStr) 405 for (unsigned i = 0, e = getNumOptions(); i != e; ++i) 406 OptionNames.push_back(getOption(i)); 407 } 408 409 410 enum ValueExpected getValueExpectedFlagDefault() const { 411 // If there is an ArgStr specified, then we are of the form: 412 // 413 // -opt=O2 or -opt O2 or -optO2 414 // 415 // In which case, the value is required. Otherwise if an arg str has not 416 // been specified, we are of the form: 417 // 418 // -O2 or O2 or -la (where -l and -a are separate options) 419 // 420 // If this is the case, we cannot allow a value. 421 // 422 if (hasArgStr) 423 return ValueRequired; 424 else 425 return ValueDisallowed; 426 } 427 428 // findOption - Return the option number corresponding to the specified 429 // argument string. If the option is not found, getNumOptions() is returned. 430 // 431 unsigned findOption(const char *Name); 432 433protected: 434 bool hasArgStr; 435}; 436 437// Default parser implementation - This implementation depends on having a 438// mapping of recognized options to values of some sort. In addition to this, 439// each entry in the mapping also tracks a help message that is printed with the 440// command line option for --help. Because this is a simple mapping parser, the 441// data type can be any unsupported type. 442// 443template <class DataType> 444class parser : public generic_parser_base { 445protected: 446 SmallVector<std::pair<const char *, 447 std::pair<DataType, const char *> >, 8> Values; 448public: 449 typedef DataType parser_data_type; 450 451 // Implement virtual functions needed by generic_parser_base 452 unsigned getNumOptions() const { return unsigned(Values.size()); } 453 const char *getOption(unsigned N) const { return Values[N].first; } 454 const char *getDescription(unsigned N) const { 455 return Values[N].second.second; 456 } 457 458 // parse - Return true on error. 459 bool parse(Option &O, const char *ArgName, StringRef Arg, DataType &V) { 460 StringRef ArgVal; 461 if (hasArgStr) 462 ArgVal = Arg; 463 else 464 ArgVal = ArgName; 465 466 for (unsigned i = 0, e = static_cast<unsigned>(Values.size()); 467 i != e; ++i) 468 if (Values[i].first == ArgVal) { 469 V = Values[i].second.first; 470 return false; 471 } 472 473 return O.error("Cannot find option named '" + ArgVal + "'!"); 474 } 475 476 /// addLiteralOption - Add an entry to the mapping table. 477 /// 478 template <class DT> 479 void addLiteralOption(const char *Name, const DT &V, const char *HelpStr) { 480 assert(findOption(Name) == Values.size() && "Option already exists!"); 481 Values.push_back(std::make_pair(Name, 482 std::make_pair(static_cast<DataType>(V),HelpStr))); 483 MarkOptionsChanged(); 484 } 485 486 /// removeLiteralOption - Remove the specified option. 487 /// 488 void removeLiteralOption(const char *Name) { 489 unsigned N = findOption(Name); 490 assert(N != Values.size() && "Option not found!"); 491 Values.erase(Values.begin()+N); 492 } 493}; 494 495//-------------------------------------------------- 496// basic_parser - Super class of parsers to provide boilerplate code 497// 498struct basic_parser_impl { // non-template implementation of basic_parser<t> 499 virtual ~basic_parser_impl() {} 500 501 enum ValueExpected getValueExpectedFlagDefault() const { 502 return ValueRequired; 503 } 504 505 void getExtraOptionNames(std::vector<const char*> &) {} 506 507 void initialize(Option &) {} 508 509 // Return the width of the option tag for printing... 510 size_t getOptionWidth(const Option &O) const; 511 512 // printOptionInfo - Print out information about this option. The 513 // to-be-maintained width is specified. 514 // 515 void printOptionInfo(const Option &O, size_t GlobalWidth) const; 516 517 // getValueName - Overload in subclass to provide a better default value. 518 virtual const char *getValueName() const { return "value"; } 519 520 // An out-of-line virtual method to provide a 'home' for this class. 521 virtual void anchor(); 522}; 523 524// basic_parser - The real basic parser is just a template wrapper that provides 525// a typedef for the provided data type. 526// 527template<class DataType> 528struct basic_parser : public basic_parser_impl { 529 typedef DataType parser_data_type; 530}; 531 532//-------------------------------------------------- 533// parser<bool> 534// 535template<> 536class parser<bool> : public basic_parser<bool> { 537 const char *ArgStr; 538public: 539 540 // parse - Return true on error. 541 bool parse(Option &O, const char *ArgName, StringRef Arg, bool &Val); 542 543 template <class Opt> 544 void initialize(Opt &O) { 545 ArgStr = O.ArgStr; 546 } 547 548 enum ValueExpected getValueExpectedFlagDefault() const { 549 return ValueOptional; 550 } 551 552 // getValueName - Do not print =<value> at all. 553 virtual const char *getValueName() const { return 0; } 554 555 // An out-of-line virtual method to provide a 'home' for this class. 556 virtual void anchor(); 557}; 558 559EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<bool>); 560 561//-------------------------------------------------- 562// parser<boolOrDefault> 563enum boolOrDefault { BOU_UNSET, BOU_TRUE, BOU_FALSE }; 564template<> 565class parser<boolOrDefault> : public basic_parser<boolOrDefault> { 566public: 567 // parse - Return true on error. 568 bool parse(Option &O, const char *ArgName, StringRef Arg, boolOrDefault &Val); 569 570 enum ValueExpected getValueExpectedFlagDefault() const { 571 return ValueOptional; 572 } 573 574 // getValueName - Do not print =<value> at all. 575 virtual const char *getValueName() const { return 0; } 576 577 // An out-of-line virtual method to provide a 'home' for this class. 578 virtual void anchor(); 579}; 580 581EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<boolOrDefault>); 582 583//-------------------------------------------------- 584// parser<int> 585// 586template<> 587class parser<int> : public basic_parser<int> { 588public: 589 // parse - Return true on error. 590 bool parse(Option &O, const char *ArgName, StringRef Arg, int &Val); 591 592 // getValueName - Overload in subclass to provide a better default value. 593 virtual const char *getValueName() const { return "int"; } 594 595 // An out-of-line virtual method to provide a 'home' for this class. 596 virtual void anchor(); 597}; 598 599EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<int>); 600 601 602//-------------------------------------------------- 603// parser<unsigned> 604// 605template<> 606class parser<unsigned> : public basic_parser<unsigned> { 607public: 608 // parse - Return true on error. 609 bool parse(Option &O, const char *AN, StringRef Arg, unsigned &Val); 610 611 // getValueName - Overload in subclass to provide a better default value. 612 virtual const char *getValueName() const { return "uint"; } 613 614 // An out-of-line virtual method to provide a 'home' for this class. 615 virtual void anchor(); 616}; 617 618EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<unsigned>); 619 620//-------------------------------------------------- 621// parser<double> 622// 623template<> 624class parser<double> : public basic_parser<double> { 625public: 626 // parse - Return true on error. 627 bool parse(Option &O, const char *AN, StringRef Arg, double &Val); 628 629 // getValueName - Overload in subclass to provide a better default value. 630 virtual const char *getValueName() const { return "number"; } 631 632 // An out-of-line virtual method to provide a 'home' for this class. 633 virtual void anchor(); 634}; 635 636EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<double>); 637 638//-------------------------------------------------- 639// parser<float> 640// 641template<> 642class parser<float> : public basic_parser<float> { 643public: 644 // parse - Return true on error. 645 bool parse(Option &O, const char *AN, StringRef Arg, float &Val); 646 647 // getValueName - Overload in subclass to provide a better default value. 648 virtual const char *getValueName() const { return "number"; } 649 650 // An out-of-line virtual method to provide a 'home' for this class. 651 virtual void anchor(); 652}; 653 654EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<float>); 655 656//-------------------------------------------------- 657// parser<std::string> 658// 659template<> 660class parser<std::string> : public basic_parser<std::string> { 661public: 662 // parse - Return true on error. 663 bool parse(Option &, const char *, StringRef Arg, std::string &Value) { 664 Value = Arg.str(); 665 return false; 666 } 667 668 // getValueName - Overload in subclass to provide a better default value. 669 virtual const char *getValueName() const { return "string"; } 670 671 // An out-of-line virtual method to provide a 'home' for this class. 672 virtual void anchor(); 673}; 674 675EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<std::string>); 676 677//-------------------------------------------------- 678// parser<char> 679// 680template<> 681class parser<char> : public basic_parser<char> { 682public: 683 // parse - Return true on error. 684 bool parse(Option &, const char *, StringRef Arg, char &Value) { 685 Value = Arg[0]; 686 return false; 687 } 688 689 // getValueName - Overload in subclass to provide a better default value. 690 virtual const char *getValueName() const { return "char"; } 691 692 // An out-of-line virtual method to provide a 'home' for this class. 693 virtual void anchor(); 694}; 695 696EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<char>); 697 698//===----------------------------------------------------------------------===// 699// applicator class - This class is used because we must use partial 700// specialization to handle literal string arguments specially (const char* does 701// not correctly respond to the apply method). Because the syntax to use this 702// is a pain, we have the 'apply' method below to handle the nastiness... 703// 704template<class Mod> struct applicator { 705 template<class Opt> 706 static void opt(const Mod &M, Opt &O) { M.apply(O); } 707}; 708 709// Handle const char* as a special case... 710template<unsigned n> struct applicator<char[n]> { 711 template<class Opt> 712 static void opt(const char *Str, Opt &O) { O.setArgStr(Str); } 713}; 714template<unsigned n> struct applicator<const char[n]> { 715 template<class Opt> 716 static void opt(const char *Str, Opt &O) { O.setArgStr(Str); } 717}; 718template<> struct applicator<const char*> { 719 template<class Opt> 720 static void opt(const char *Str, Opt &O) { O.setArgStr(Str); } 721}; 722 723template<> struct applicator<NumOccurrences> { 724 static void opt(NumOccurrences NO, Option &O) { O.setNumOccurrencesFlag(NO); } 725}; 726template<> struct applicator<ValueExpected> { 727 static void opt(ValueExpected VE, Option &O) { O.setValueExpectedFlag(VE); } 728}; 729template<> struct applicator<OptionHidden> { 730 static void opt(OptionHidden OH, Option &O) { O.setHiddenFlag(OH); } 731}; 732template<> struct applicator<FormattingFlags> { 733 static void opt(FormattingFlags FF, Option &O) { O.setFormattingFlag(FF); } 734}; 735template<> struct applicator<MiscFlags> { 736 static void opt(MiscFlags MF, Option &O) { O.setMiscFlag(MF); } 737}; 738 739// apply method - Apply a modifier to an option in a type safe way. 740template<class Mod, class Opt> 741void apply(const Mod &M, Opt *O) { 742 applicator<Mod>::opt(M, *O); 743} 744 745 746//===----------------------------------------------------------------------===// 747// opt_storage class 748 749// Default storage class definition: external storage. This implementation 750// assumes the user will specify a variable to store the data into with the 751// cl::location(x) modifier. 752// 753template<class DataType, bool ExternalStorage, bool isClass> 754class opt_storage { 755 DataType *Location; // Where to store the object... 756 757 void check() const { 758 assert(Location != 0 && "cl::location(...) not specified for a command " 759 "line option with external storage, " 760 "or cl::init specified before cl::location()!!"); 761 } 762public: 763 opt_storage() : Location(0) {} 764 765 bool setLocation(Option &O, DataType &L) { 766 if (Location) 767 return O.error("cl::location(x) specified more than once!"); 768 Location = &L; 769 return false; 770 } 771 772 template<class T> 773 void setValue(const T &V) { 774 check(); 775 *Location = V; 776 } 777 778 DataType &getValue() { check(); return *Location; } 779 const DataType &getValue() const { check(); return *Location; } 780}; 781 782 783// Define how to hold a class type object, such as a string. Since we can 784// inherit from a class, we do so. This makes us exactly compatible with the 785// object in all cases that it is used. 786// 787template<class DataType> 788class opt_storage<DataType,false,true> : public DataType { 789public: 790 template<class T> 791 void setValue(const T &V) { DataType::operator=(V); } 792 793 DataType &getValue() { return *this; } 794 const DataType &getValue() const { return *this; } 795}; 796 797// Define a partial specialization to handle things we cannot inherit from. In 798// this case, we store an instance through containment, and overload operators 799// to get at the value. 800// 801template<class DataType> 802class opt_storage<DataType, false, false> { 803public: 804 DataType Value; 805 806 // Make sure we initialize the value with the default constructor for the 807 // type. 808 opt_storage() : Value(DataType()) {} 809 810 template<class T> 811 void setValue(const T &V) { Value = V; } 812 DataType &getValue() { return Value; } 813 DataType getValue() const { return Value; } 814 815 // If the datatype is a pointer, support -> on it. 816 DataType operator->() const { return Value; } 817}; 818 819 820//===----------------------------------------------------------------------===// 821// opt - A scalar command line option. 822// 823template <class DataType, bool ExternalStorage = false, 824 class ParserClass = parser<DataType> > 825class opt : public Option, 826 public opt_storage<DataType, ExternalStorage, 827 is_class<DataType>::value> { 828 ParserClass Parser; 829 830 virtual bool handleOccurrence(unsigned pos, const char *ArgName, 831 StringRef Arg) { 832 typename ParserClass::parser_data_type Val = 833 typename ParserClass::parser_data_type(); 834 if (Parser.parse(*this, ArgName, Arg, Val)) 835 return true; // Parse error! 836 this->setValue(Val); 837 this->setPosition(pos); 838 return false; 839 } 840 841 virtual enum ValueExpected getValueExpectedFlagDefault() const { 842 return Parser.getValueExpectedFlagDefault(); 843 } 844 virtual void getExtraOptionNames(std::vector<const char*> &OptionNames) { 845 return Parser.getExtraOptionNames(OptionNames); 846 } 847 848 // Forward printing stuff to the parser... 849 virtual size_t getOptionWidth() const {return Parser.getOptionWidth(*this);} 850 virtual void printOptionInfo(size_t GlobalWidth) const { 851 Parser.printOptionInfo(*this, GlobalWidth); 852 } 853 854 void done() { 855 addArgument(); 856 Parser.initialize(*this); 857 } 858public: 859 // setInitialValue - Used by the cl::init modifier... 860 void setInitialValue(const DataType &V) { this->setValue(V); } 861 862 ParserClass &getParser() { return Parser; } 863 864 operator DataType() const { return this->getValue(); } 865 866 template<class T> 867 DataType &operator=(const T &Val) { 868 this->setValue(Val); 869 return this->getValue(); 870 } 871 872 // One option... 873 template<class M0t> 874 explicit opt(const M0t &M0) : Option(Optional | NotHidden) { 875 apply(M0, this); 876 done(); 877 } 878 879 // Two options... 880 template<class M0t, class M1t> 881 opt(const M0t &M0, const M1t &M1) : Option(Optional | NotHidden) { 882 apply(M0, this); apply(M1, this); 883 done(); 884 } 885 886 // Three options... 887 template<class M0t, class M1t, class M2t> 888 opt(const M0t &M0, const M1t &M1, 889 const M2t &M2) : Option(Optional | NotHidden) { 890 apply(M0, this); apply(M1, this); apply(M2, this); 891 done(); 892 } 893 // Four options... 894 template<class M0t, class M1t, class M2t, class M3t> 895 opt(const M0t &M0, const M1t &M1, const M2t &M2, 896 const M3t &M3) : Option(Optional | NotHidden) { 897 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 898 done(); 899 } 900 // Five options... 901 template<class M0t, class M1t, class M2t, class M3t, class M4t> 902 opt(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 903 const M4t &M4) : Option(Optional | NotHidden) { 904 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 905 apply(M4, this); 906 done(); 907 } 908 // Six options... 909 template<class M0t, class M1t, class M2t, class M3t, 910 class M4t, class M5t> 911 opt(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 912 const M4t &M4, const M5t &M5) : Option(Optional | NotHidden) { 913 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 914 apply(M4, this); apply(M5, this); 915 done(); 916 } 917 // Seven options... 918 template<class M0t, class M1t, class M2t, class M3t, 919 class M4t, class M5t, class M6t> 920 opt(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 921 const M4t &M4, const M5t &M5, 922 const M6t &M6) : Option(Optional | NotHidden) { 923 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 924 apply(M4, this); apply(M5, this); apply(M6, this); 925 done(); 926 } 927 // Eight options... 928 template<class M0t, class M1t, class M2t, class M3t, 929 class M4t, class M5t, class M6t, class M7t> 930 opt(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 931 const M4t &M4, const M5t &M5, const M6t &M6, 932 const M7t &M7) : Option(Optional | NotHidden) { 933 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 934 apply(M4, this); apply(M5, this); apply(M6, this); apply(M7, this); 935 done(); 936 } 937}; 938 939EXTERN_TEMPLATE_INSTANTIATION(class opt<unsigned>); 940EXTERN_TEMPLATE_INSTANTIATION(class opt<int>); 941EXTERN_TEMPLATE_INSTANTIATION(class opt<std::string>); 942EXTERN_TEMPLATE_INSTANTIATION(class opt<char>); 943EXTERN_TEMPLATE_INSTANTIATION(class opt<bool>); 944 945//===----------------------------------------------------------------------===// 946// list_storage class 947 948// Default storage class definition: external storage. This implementation 949// assumes the user will specify a variable to store the data into with the 950// cl::location(x) modifier. 951// 952template<class DataType, class StorageClass> 953class list_storage { 954 StorageClass *Location; // Where to store the object... 955 956public: 957 list_storage() : Location(0) {} 958 959 bool setLocation(Option &O, StorageClass &L) { 960 if (Location) 961 return O.error("cl::location(x) specified more than once!"); 962 Location = &L; 963 return false; 964 } 965 966 template<class T> 967 void addValue(const T &V) { 968 assert(Location != 0 && "cl::location(...) not specified for a command " 969 "line option with external storage!"); 970 Location->push_back(V); 971 } 972}; 973 974 975// Define how to hold a class type object, such as a string. Since we can 976// inherit from a class, we do so. This makes us exactly compatible with the 977// object in all cases that it is used. 978// 979template<class DataType> 980class list_storage<DataType, bool> : public std::vector<DataType> { 981public: 982 template<class T> 983 void addValue(const T &V) { push_back(V); } 984}; 985 986 987//===----------------------------------------------------------------------===// 988// list - A list of command line options. 989// 990template <class DataType, class Storage = bool, 991 class ParserClass = parser<DataType> > 992class list : public Option, public list_storage<DataType, Storage> { 993 std::vector<unsigned> Positions; 994 ParserClass Parser; 995 996 virtual enum ValueExpected getValueExpectedFlagDefault() const { 997 return Parser.getValueExpectedFlagDefault(); 998 } 999 virtual void getExtraOptionNames(std::vector<const char*> &OptionNames) { 1000 return Parser.getExtraOptionNames(OptionNames); 1001 } 1002 1003 virtual bool handleOccurrence(unsigned pos, const char *ArgName, 1004 StringRef Arg) { 1005 typename ParserClass::parser_data_type Val = 1006 typename ParserClass::parser_data_type(); 1007 if (Parser.parse(*this, ArgName, Arg, Val)) 1008 return true; // Parse Error! 1009 addValue(Val); 1010 setPosition(pos); 1011 Positions.push_back(pos); 1012 return false; 1013 } 1014 1015 // Forward printing stuff to the parser... 1016 virtual size_t getOptionWidth() const {return Parser.getOptionWidth(*this);} 1017 virtual void printOptionInfo(size_t GlobalWidth) const { 1018 Parser.printOptionInfo(*this, GlobalWidth); 1019 } 1020 1021 void done() { 1022 addArgument(); 1023 Parser.initialize(*this); 1024 } 1025public: 1026 ParserClass &getParser() { return Parser; } 1027 1028 unsigned getPosition(unsigned optnum) const { 1029 assert(optnum < this->size() && "Invalid option index"); 1030 return Positions[optnum]; 1031 } 1032 1033 void setNumAdditionalVals(unsigned n) { 1034 Option::setNumAdditionalVals(n); 1035 } 1036 1037 // One option... 1038 template<class M0t> 1039 explicit list(const M0t &M0) : Option(ZeroOrMore | NotHidden) { 1040 apply(M0, this); 1041 done(); 1042 } 1043 // Two options... 1044 template<class M0t, class M1t> 1045 list(const M0t &M0, const M1t &M1) : Option(ZeroOrMore | NotHidden) { 1046 apply(M0, this); apply(M1, this); 1047 done(); 1048 } 1049 // Three options... 1050 template<class M0t, class M1t, class M2t> 1051 list(const M0t &M0, const M1t &M1, const M2t &M2) 1052 : Option(ZeroOrMore | NotHidden) { 1053 apply(M0, this); apply(M1, this); apply(M2, this); 1054 done(); 1055 } 1056 // Four options... 1057 template<class M0t, class M1t, class M2t, class M3t> 1058 list(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3) 1059 : Option(ZeroOrMore | NotHidden) { 1060 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1061 done(); 1062 } 1063 // Five options... 1064 template<class M0t, class M1t, class M2t, class M3t, class M4t> 1065 list(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 1066 const M4t &M4) : Option(ZeroOrMore | NotHidden) { 1067 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1068 apply(M4, this); 1069 done(); 1070 } 1071 // Six options... 1072 template<class M0t, class M1t, class M2t, class M3t, 1073 class M4t, class M5t> 1074 list(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 1075 const M4t &M4, const M5t &M5) : Option(ZeroOrMore | NotHidden) { 1076 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1077 apply(M4, this); apply(M5, this); 1078 done(); 1079 } 1080 // Seven options... 1081 template<class M0t, class M1t, class M2t, class M3t, 1082 class M4t, class M5t, class M6t> 1083 list(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 1084 const M4t &M4, const M5t &M5, const M6t &M6) 1085 : Option(ZeroOrMore | NotHidden) { 1086 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1087 apply(M4, this); apply(M5, this); apply(M6, this); 1088 done(); 1089 } 1090 // Eight options... 1091 template<class M0t, class M1t, class M2t, class M3t, 1092 class M4t, class M5t, class M6t, class M7t> 1093 list(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 1094 const M4t &M4, const M5t &M5, const M6t &M6, 1095 const M7t &M7) : Option(ZeroOrMore | NotHidden) { 1096 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1097 apply(M4, this); apply(M5, this); apply(M6, this); apply(M7, this); 1098 done(); 1099 } 1100}; 1101 1102// multi_val - Modifier to set the number of additional values. 1103struct multi_val { 1104 unsigned AdditionalVals; 1105 explicit multi_val(unsigned N) : AdditionalVals(N) {} 1106 1107 template <typename D, typename S, typename P> 1108 void apply(list<D, S, P> &L) const { L.setNumAdditionalVals(AdditionalVals); } 1109}; 1110 1111 1112//===----------------------------------------------------------------------===// 1113// bits_storage class 1114 1115// Default storage class definition: external storage. This implementation 1116// assumes the user will specify a variable to store the data into with the 1117// cl::location(x) modifier. 1118// 1119template<class DataType, class StorageClass> 1120class bits_storage { 1121 unsigned *Location; // Where to store the bits... 1122 1123 template<class T> 1124 static unsigned Bit(const T &V) { 1125 unsigned BitPos = reinterpret_cast<unsigned>(V); 1126 assert(BitPos < sizeof(unsigned) * CHAR_BIT && 1127 "enum exceeds width of bit vector!"); 1128 return 1 << BitPos; 1129 } 1130 1131public: 1132 bits_storage() : Location(0) {} 1133 1134 bool setLocation(Option &O, unsigned &L) { 1135 if (Location) 1136 return O.error("cl::location(x) specified more than once!"); 1137 Location = &L; 1138 return false; 1139 } 1140 1141 template<class T> 1142 void addValue(const T &V) { 1143 assert(Location != 0 && "cl::location(...) not specified for a command " 1144 "line option with external storage!"); 1145 *Location |= Bit(V); 1146 } 1147 1148 unsigned getBits() { return *Location; } 1149 1150 template<class T> 1151 bool isSet(const T &V) { 1152 return (*Location & Bit(V)) != 0; 1153 } 1154}; 1155 1156 1157// Define how to hold bits. Since we can inherit from a class, we do so. 1158// This makes us exactly compatible with the bits in all cases that it is used. 1159// 1160template<class DataType> 1161class bits_storage<DataType, bool> { 1162 unsigned Bits; // Where to store the bits... 1163 1164 template<class T> 1165 static unsigned Bit(const T &V) { 1166 unsigned BitPos = reinterpret_cast<unsigned>(V); 1167 assert(BitPos < sizeof(unsigned) * CHAR_BIT && 1168 "enum exceeds width of bit vector!"); 1169 return 1 << BitPos; 1170 } 1171 1172public: 1173 template<class T> 1174 void addValue(const T &V) { 1175 Bits |= Bit(V); 1176 } 1177 1178 unsigned getBits() { return Bits; } 1179 1180 template<class T> 1181 bool isSet(const T &V) { 1182 return (Bits & Bit(V)) != 0; 1183 } 1184}; 1185 1186 1187//===----------------------------------------------------------------------===// 1188// bits - A bit vector of command options. 1189// 1190template <class DataType, class Storage = bool, 1191 class ParserClass = parser<DataType> > 1192class bits : public Option, public bits_storage<DataType, Storage> { 1193 std::vector<unsigned> Positions; 1194 ParserClass Parser; 1195 1196 virtual enum ValueExpected getValueExpectedFlagDefault() const { 1197 return Parser.getValueExpectedFlagDefault(); 1198 } 1199 virtual void getExtraOptionNames(std::vector<const char*> &OptionNames) { 1200 return Parser.getExtraOptionNames(OptionNames); 1201 } 1202 1203 virtual bool handleOccurrence(unsigned pos, const char *ArgName, 1204 StringRef Arg) { 1205 typename ParserClass::parser_data_type Val = 1206 typename ParserClass::parser_data_type(); 1207 if (Parser.parse(*this, ArgName, Arg, Val)) 1208 return true; // Parse Error! 1209 addValue(Val); 1210 setPosition(pos); 1211 Positions.push_back(pos); 1212 return false; 1213 } 1214 1215 // Forward printing stuff to the parser... 1216 virtual size_t getOptionWidth() const {return Parser.getOptionWidth(*this);} 1217 virtual void printOptionInfo(size_t GlobalWidth) const { 1218 Parser.printOptionInfo(*this, GlobalWidth); 1219 } 1220 1221 void done() { 1222 addArgument(); 1223 Parser.initialize(*this); 1224 } 1225public: 1226 ParserClass &getParser() { return Parser; } 1227 1228 unsigned getPosition(unsigned optnum) const { 1229 assert(optnum < this->size() && "Invalid option index"); 1230 return Positions[optnum]; 1231 } 1232 1233 // One option... 1234 template<class M0t> 1235 explicit bits(const M0t &M0) : Option(ZeroOrMore | NotHidden) { 1236 apply(M0, this); 1237 done(); 1238 } 1239 // Two options... 1240 template<class M0t, class M1t> 1241 bits(const M0t &M0, const M1t &M1) : Option(ZeroOrMore | NotHidden) { 1242 apply(M0, this); apply(M1, this); 1243 done(); 1244 } 1245 // Three options... 1246 template<class M0t, class M1t, class M2t> 1247 bits(const M0t &M0, const M1t &M1, const M2t &M2) 1248 : Option(ZeroOrMore | NotHidden) { 1249 apply(M0, this); apply(M1, this); apply(M2, this); 1250 done(); 1251 } 1252 // Four options... 1253 template<class M0t, class M1t, class M2t, class M3t> 1254 bits(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3) 1255 : Option(ZeroOrMore | NotHidden) { 1256 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1257 done(); 1258 } 1259 // Five options... 1260 template<class M0t, class M1t, class M2t, class M3t, class M4t> 1261 bits(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 1262 const M4t &M4) : Option(ZeroOrMore | NotHidden) { 1263 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1264 apply(M4, this); 1265 done(); 1266 } 1267 // Six options... 1268 template<class M0t, class M1t, class M2t, class M3t, 1269 class M4t, class M5t> 1270 bits(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 1271 const M4t &M4, const M5t &M5) : Option(ZeroOrMore | NotHidden) { 1272 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1273 apply(M4, this); apply(M5, this); 1274 done(); 1275 } 1276 // Seven options... 1277 template<class M0t, class M1t, class M2t, class M3t, 1278 class M4t, class M5t, class M6t> 1279 bits(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 1280 const M4t &M4, const M5t &M5, const M6t &M6) 1281 : Option(ZeroOrMore | NotHidden) { 1282 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1283 apply(M4, this); apply(M5, this); apply(M6, this); 1284 done(); 1285 } 1286 // Eight options... 1287 template<class M0t, class M1t, class M2t, class M3t, 1288 class M4t, class M5t, class M6t, class M7t> 1289 bits(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 1290 const M4t &M4, const M5t &M5, const M6t &M6, 1291 const M7t &M7) : Option(ZeroOrMore | NotHidden) { 1292 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1293 apply(M4, this); apply(M5, this); apply(M6, this); apply(M7, this); 1294 done(); 1295 } 1296}; 1297 1298//===----------------------------------------------------------------------===// 1299// Aliased command line option (alias this name to a preexisting name) 1300// 1301 1302class alias : public Option { 1303 Option *AliasFor; 1304 virtual bool handleOccurrence(unsigned pos, const char * /*ArgName*/, 1305 StringRef Arg) { 1306 return AliasFor->handleOccurrence(pos, AliasFor->ArgStr, Arg); 1307 } 1308 // Handle printing stuff... 1309 virtual size_t getOptionWidth() const; 1310 virtual void printOptionInfo(size_t GlobalWidth) const; 1311 1312 void done() { 1313 if (!hasArgStr()) 1314 error("cl::alias must have argument name specified!"); 1315 if (AliasFor == 0) 1316 error("cl::alias must have an cl::aliasopt(option) specified!"); 1317 addArgument(); 1318 } 1319public: 1320 void setAliasFor(Option &O) { 1321 if (AliasFor) 1322 error("cl::alias must only have one cl::aliasopt(...) specified!"); 1323 AliasFor = &O; 1324 } 1325 1326 // One option... 1327 template<class M0t> 1328 explicit alias(const M0t &M0) : Option(Optional | Hidden), AliasFor(0) { 1329 apply(M0, this); 1330 done(); 1331 } 1332 // Two options... 1333 template<class M0t, class M1t> 1334 alias(const M0t &M0, const M1t &M1) : Option(Optional | Hidden), AliasFor(0) { 1335 apply(M0, this); apply(M1, this); 1336 done(); 1337 } 1338 // Three options... 1339 template<class M0t, class M1t, class M2t> 1340 alias(const M0t &M0, const M1t &M1, const M2t &M2) 1341 : Option(Optional | Hidden), AliasFor(0) { 1342 apply(M0, this); apply(M1, this); apply(M2, this); 1343 done(); 1344 } 1345 // Four options... 1346 template<class M0t, class M1t, class M2t, class M3t> 1347 alias(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3) 1348 : Option(Optional | Hidden), AliasFor(0) { 1349 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1350 done(); 1351 } 1352}; 1353 1354// aliasfor - Modifier to set the option an alias aliases. 1355struct aliasopt { 1356 Option &Opt; 1357 explicit aliasopt(Option &O) : Opt(O) {} 1358 void apply(alias &A) const { A.setAliasFor(Opt); } 1359}; 1360 1361// extrahelp - provide additional help at the end of the normal help 1362// output. All occurrences of cl::extrahelp will be accumulated and 1363// printed to stderr at the end of the regular help, just before 1364// exit is called. 1365struct extrahelp { 1366 const char * morehelp; 1367 explicit extrahelp(const char* help); 1368}; 1369 1370void PrintVersionMessage(); 1371// This function just prints the help message, exactly the same way as if the 1372// --help option had been given on the command line. 1373// NOTE: THIS FUNCTION TERMINATES THE PROGRAM! 1374void PrintHelpMessage(); 1375 1376} // End namespace cl 1377 1378} // End namespace llvm 1379 1380#endif 1381