CommandLine.h revision 204642
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 NumOccurrencesFlag { // 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, StringRef 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 NumOccurrencesFlag getNumOccurrencesFlag() const { 166 return static_cast<enum NumOccurrencesFlag>(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 NumOccurrencesFlag 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(SmallVectorImpl<const char*> &) {} 234 235 // addOccurrence - Wrapper around handleOccurrence that enforces Flags. 236 // 237 bool addOccurrence(unsigned pos, StringRef ArgName, 238 StringRef Value, bool MultiArg = false); 239 240 // Prints option name followed by message. Always returns true. 241 bool error(const Twine &Message, StringRef ArgName = StringRef()); 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(SmallVectorImpl<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, StringRef 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// 498class basic_parser_impl { // non-template implementation of basic_parser<t> 499public: 500 virtual ~basic_parser_impl() {} 501 502 enum ValueExpected getValueExpectedFlagDefault() const { 503 return ValueRequired; 504 } 505 506 void getExtraOptionNames(SmallVectorImpl<const char*> &) {} 507 508 void initialize(Option &) {} 509 510 // Return the width of the option tag for printing... 511 size_t getOptionWidth(const Option &O) const; 512 513 // printOptionInfo - Print out information about this option. The 514 // to-be-maintained width is specified. 515 // 516 void printOptionInfo(const Option &O, size_t GlobalWidth) const; 517 518 // getValueName - Overload in subclass to provide a better default value. 519 virtual const char *getValueName() const { return "value"; } 520 521 // An out-of-line virtual method to provide a 'home' for this class. 522 virtual void anchor(); 523}; 524 525// basic_parser - The real basic parser is just a template wrapper that provides 526// a typedef for the provided data type. 527// 528template<class DataType> 529class basic_parser : public basic_parser_impl { 530public: 531 typedef DataType parser_data_type; 532}; 533 534//-------------------------------------------------- 535// parser<bool> 536// 537template<> 538class parser<bool> : public basic_parser<bool> { 539 const char *ArgStr; 540public: 541 542 // parse - Return true on error. 543 bool parse(Option &O, StringRef ArgName, StringRef Arg, bool &Val); 544 545 template <class Opt> 546 void initialize(Opt &O) { 547 ArgStr = O.ArgStr; 548 } 549 550 enum ValueExpected getValueExpectedFlagDefault() const { 551 return ValueOptional; 552 } 553 554 // getValueName - Do not print =<value> at all. 555 virtual const char *getValueName() const { return 0; } 556 557 // An out-of-line virtual method to provide a 'home' for this class. 558 virtual void anchor(); 559}; 560 561EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<bool>); 562 563//-------------------------------------------------- 564// parser<boolOrDefault> 565enum boolOrDefault { BOU_UNSET, BOU_TRUE, BOU_FALSE }; 566template<> 567class parser<boolOrDefault> : public basic_parser<boolOrDefault> { 568public: 569 // parse - Return true on error. 570 bool parse(Option &O, StringRef ArgName, StringRef Arg, boolOrDefault &Val); 571 572 enum ValueExpected getValueExpectedFlagDefault() const { 573 return ValueOptional; 574 } 575 576 // getValueName - Do not print =<value> at all. 577 virtual const char *getValueName() const { return 0; } 578 579 // An out-of-line virtual method to provide a 'home' for this class. 580 virtual void anchor(); 581}; 582 583EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<boolOrDefault>); 584 585//-------------------------------------------------- 586// parser<int> 587// 588template<> 589class parser<int> : public basic_parser<int> { 590public: 591 // parse - Return true on error. 592 bool parse(Option &O, StringRef ArgName, StringRef Arg, int &Val); 593 594 // getValueName - Overload in subclass to provide a better default value. 595 virtual const char *getValueName() const { return "int"; } 596 597 // An out-of-line virtual method to provide a 'home' for this class. 598 virtual void anchor(); 599}; 600 601EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<int>); 602 603 604//-------------------------------------------------- 605// parser<unsigned> 606// 607template<> 608class parser<unsigned> : public basic_parser<unsigned> { 609public: 610 // parse - Return true on error. 611 bool parse(Option &O, StringRef ArgName, StringRef Arg, unsigned &Val); 612 613 // getValueName - Overload in subclass to provide a better default value. 614 virtual const char *getValueName() const { return "uint"; } 615 616 // An out-of-line virtual method to provide a 'home' for this class. 617 virtual void anchor(); 618}; 619 620EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<unsigned>); 621 622//-------------------------------------------------- 623// parser<double> 624// 625template<> 626class parser<double> : public basic_parser<double> { 627public: 628 // parse - Return true on error. 629 bool parse(Option &O, StringRef ArgName, StringRef Arg, double &Val); 630 631 // getValueName - Overload in subclass to provide a better default value. 632 virtual const char *getValueName() const { return "number"; } 633 634 // An out-of-line virtual method to provide a 'home' for this class. 635 virtual void anchor(); 636}; 637 638EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<double>); 639 640//-------------------------------------------------- 641// parser<float> 642// 643template<> 644class parser<float> : public basic_parser<float> { 645public: 646 // parse - Return true on error. 647 bool parse(Option &O, StringRef ArgName, StringRef Arg, float &Val); 648 649 // getValueName - Overload in subclass to provide a better default value. 650 virtual const char *getValueName() const { return "number"; } 651 652 // An out-of-line virtual method to provide a 'home' for this class. 653 virtual void anchor(); 654}; 655 656EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<float>); 657 658//-------------------------------------------------- 659// parser<std::string> 660// 661template<> 662class parser<std::string> : public basic_parser<std::string> { 663public: 664 // parse - Return true on error. 665 bool parse(Option &, StringRef, StringRef Arg, std::string &Value) { 666 Value = Arg.str(); 667 return false; 668 } 669 670 // getValueName - Overload in subclass to provide a better default value. 671 virtual const char *getValueName() const { return "string"; } 672 673 // An out-of-line virtual method to provide a 'home' for this class. 674 virtual void anchor(); 675}; 676 677EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<std::string>); 678 679//-------------------------------------------------- 680// parser<char> 681// 682template<> 683class parser<char> : public basic_parser<char> { 684public: 685 // parse - Return true on error. 686 bool parse(Option &, StringRef, StringRef Arg, char &Value) { 687 Value = Arg[0]; 688 return false; 689 } 690 691 // getValueName - Overload in subclass to provide a better default value. 692 virtual const char *getValueName() const { return "char"; } 693 694 // An out-of-line virtual method to provide a 'home' for this class. 695 virtual void anchor(); 696}; 697 698EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<char>); 699 700//===----------------------------------------------------------------------===// 701// applicator class - This class is used because we must use partial 702// specialization to handle literal string arguments specially (const char* does 703// not correctly respond to the apply method). Because the syntax to use this 704// is a pain, we have the 'apply' method below to handle the nastiness... 705// 706template<class Mod> struct applicator { 707 template<class Opt> 708 static void opt(const Mod &M, Opt &O) { M.apply(O); } 709}; 710 711// Handle const char* as a special case... 712template<unsigned n> struct applicator<char[n]> { 713 template<class Opt> 714 static void opt(const char *Str, Opt &O) { O.setArgStr(Str); } 715}; 716template<unsigned n> struct applicator<const char[n]> { 717 template<class Opt> 718 static void opt(const char *Str, Opt &O) { O.setArgStr(Str); } 719}; 720template<> struct applicator<const char*> { 721 template<class Opt> 722 static void opt(const char *Str, Opt &O) { O.setArgStr(Str); } 723}; 724 725template<> struct applicator<NumOccurrencesFlag> { 726 static void opt(NumOccurrencesFlag NO, Option &O) { 727 O.setNumOccurrencesFlag(NO); 728 } 729}; 730template<> struct applicator<ValueExpected> { 731 static void opt(ValueExpected VE, Option &O) { O.setValueExpectedFlag(VE); } 732}; 733template<> struct applicator<OptionHidden> { 734 static void opt(OptionHidden OH, Option &O) { O.setHiddenFlag(OH); } 735}; 736template<> struct applicator<FormattingFlags> { 737 static void opt(FormattingFlags FF, Option &O) { O.setFormattingFlag(FF); } 738}; 739template<> struct applicator<MiscFlags> { 740 static void opt(MiscFlags MF, Option &O) { O.setMiscFlag(MF); } 741}; 742 743// apply method - Apply a modifier to an option in a type safe way. 744template<class Mod, class Opt> 745void apply(const Mod &M, Opt *O) { 746 applicator<Mod>::opt(M, *O); 747} 748 749 750//===----------------------------------------------------------------------===// 751// opt_storage class 752 753// Default storage class definition: external storage. This implementation 754// assumes the user will specify a variable to store the data into with the 755// cl::location(x) modifier. 756// 757template<class DataType, bool ExternalStorage, bool isClass> 758class opt_storage { 759 DataType *Location; // Where to store the object... 760 761 void check() const { 762 assert(Location != 0 && "cl::location(...) not specified for a command " 763 "line option with external storage, " 764 "or cl::init specified before cl::location()!!"); 765 } 766public: 767 opt_storage() : Location(0) {} 768 769 bool setLocation(Option &O, DataType &L) { 770 if (Location) 771 return O.error("cl::location(x) specified more than once!"); 772 Location = &L; 773 return false; 774 } 775 776 template<class T> 777 void setValue(const T &V) { 778 check(); 779 *Location = V; 780 } 781 782 DataType &getValue() { check(); return *Location; } 783 const DataType &getValue() const { check(); return *Location; } 784 785 operator DataType() const { return this->getValue(); } 786}; 787 788 789// Define how to hold a class type object, such as a string. Since we can 790// inherit from a class, we do so. This makes us exactly compatible with the 791// object in all cases that it is used. 792// 793template<class DataType> 794class opt_storage<DataType,false,true> : public DataType { 795public: 796 template<class T> 797 void setValue(const T &V) { DataType::operator=(V); } 798 799 DataType &getValue() { return *this; } 800 const DataType &getValue() const { return *this; } 801}; 802 803// Define a partial specialization to handle things we cannot inherit from. In 804// this case, we store an instance through containment, and overload operators 805// to get at the value. 806// 807template<class DataType> 808class opt_storage<DataType, false, false> { 809public: 810 DataType Value; 811 812 // Make sure we initialize the value with the default constructor for the 813 // type. 814 opt_storage() : Value(DataType()) {} 815 816 template<class T> 817 void setValue(const T &V) { Value = V; } 818 DataType &getValue() { return Value; } 819 DataType getValue() const { return Value; } 820 821 operator DataType() const { return getValue(); } 822 823 // If the datatype is a pointer, support -> on it. 824 DataType operator->() const { return Value; } 825}; 826 827 828//===----------------------------------------------------------------------===// 829// opt - A scalar command line option. 830// 831template <class DataType, bool ExternalStorage = false, 832 class ParserClass = parser<DataType> > 833class opt : public Option, 834 public opt_storage<DataType, ExternalStorage, 835 is_class<DataType>::value> { 836 ParserClass Parser; 837 838 virtual bool handleOccurrence(unsigned pos, StringRef ArgName, 839 StringRef Arg) { 840 typename ParserClass::parser_data_type Val = 841 typename ParserClass::parser_data_type(); 842 if (Parser.parse(*this, ArgName, Arg, Val)) 843 return true; // Parse error! 844 this->setValue(Val); 845 this->setPosition(pos); 846 return false; 847 } 848 849 virtual enum ValueExpected getValueExpectedFlagDefault() const { 850 return Parser.getValueExpectedFlagDefault(); 851 } 852 virtual void getExtraOptionNames(SmallVectorImpl<const char*> &OptionNames) { 853 return Parser.getExtraOptionNames(OptionNames); 854 } 855 856 // Forward printing stuff to the parser... 857 virtual size_t getOptionWidth() const {return Parser.getOptionWidth(*this);} 858 virtual void printOptionInfo(size_t GlobalWidth) const { 859 Parser.printOptionInfo(*this, GlobalWidth); 860 } 861 862 void done() { 863 addArgument(); 864 Parser.initialize(*this); 865 } 866public: 867 // setInitialValue - Used by the cl::init modifier... 868 void setInitialValue(const DataType &V) { this->setValue(V); } 869 870 ParserClass &getParser() { return Parser; } 871 872 template<class T> 873 DataType &operator=(const T &Val) { 874 this->setValue(Val); 875 return this->getValue(); 876 } 877 878 // One option... 879 template<class M0t> 880 explicit opt(const M0t &M0) : Option(Optional | NotHidden) { 881 apply(M0, this); 882 done(); 883 } 884 885 // Two options... 886 template<class M0t, class M1t> 887 opt(const M0t &M0, const M1t &M1) : Option(Optional | NotHidden) { 888 apply(M0, this); apply(M1, this); 889 done(); 890 } 891 892 // Three options... 893 template<class M0t, class M1t, class M2t> 894 opt(const M0t &M0, const M1t &M1, 895 const M2t &M2) : Option(Optional | NotHidden) { 896 apply(M0, this); apply(M1, this); apply(M2, this); 897 done(); 898 } 899 // Four options... 900 template<class M0t, class M1t, class M2t, class M3t> 901 opt(const M0t &M0, const M1t &M1, const M2t &M2, 902 const M3t &M3) : Option(Optional | NotHidden) { 903 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 904 done(); 905 } 906 // Five options... 907 template<class M0t, class M1t, class M2t, class M3t, class M4t> 908 opt(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 909 const M4t &M4) : Option(Optional | NotHidden) { 910 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 911 apply(M4, this); 912 done(); 913 } 914 // Six options... 915 template<class M0t, class M1t, class M2t, class M3t, 916 class M4t, class M5t> 917 opt(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 918 const M4t &M4, const M5t &M5) : Option(Optional | NotHidden) { 919 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 920 apply(M4, this); apply(M5, this); 921 done(); 922 } 923 // Seven options... 924 template<class M0t, class M1t, class M2t, class M3t, 925 class M4t, class M5t, class M6t> 926 opt(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 927 const M4t &M4, const M5t &M5, 928 const M6t &M6) : Option(Optional | NotHidden) { 929 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 930 apply(M4, this); apply(M5, this); apply(M6, this); 931 done(); 932 } 933 // Eight options... 934 template<class M0t, class M1t, class M2t, class M3t, 935 class M4t, class M5t, class M6t, class M7t> 936 opt(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 937 const M4t &M4, const M5t &M5, const M6t &M6, 938 const M7t &M7) : Option(Optional | NotHidden) { 939 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 940 apply(M4, this); apply(M5, this); apply(M6, this); apply(M7, this); 941 done(); 942 } 943}; 944 945EXTERN_TEMPLATE_INSTANTIATION(class opt<unsigned>); 946EXTERN_TEMPLATE_INSTANTIATION(class opt<int>); 947EXTERN_TEMPLATE_INSTANTIATION(class opt<std::string>); 948EXTERN_TEMPLATE_INSTANTIATION(class opt<char>); 949EXTERN_TEMPLATE_INSTANTIATION(class opt<bool>); 950 951//===----------------------------------------------------------------------===// 952// list_storage class 953 954// Default storage class definition: external storage. This implementation 955// assumes the user will specify a variable to store the data into with the 956// cl::location(x) modifier. 957// 958template<class DataType, class StorageClass> 959class list_storage { 960 StorageClass *Location; // Where to store the object... 961 962public: 963 list_storage() : Location(0) {} 964 965 bool setLocation(Option &O, StorageClass &L) { 966 if (Location) 967 return O.error("cl::location(x) specified more than once!"); 968 Location = &L; 969 return false; 970 } 971 972 template<class T> 973 void addValue(const T &V) { 974 assert(Location != 0 && "cl::location(...) not specified for a command " 975 "line option with external storage!"); 976 Location->push_back(V); 977 } 978}; 979 980 981// Define how to hold a class type object, such as a string. Since we can 982// inherit from a class, we do so. This makes us exactly compatible with the 983// object in all cases that it is used. 984// 985template<class DataType> 986class list_storage<DataType, bool> : public std::vector<DataType> { 987public: 988 template<class T> 989 void addValue(const T &V) { std::vector<DataType>::push_back(V); } 990}; 991 992 993//===----------------------------------------------------------------------===// 994// list - A list of command line options. 995// 996template <class DataType, class Storage = bool, 997 class ParserClass = parser<DataType> > 998class list : public Option, public list_storage<DataType, Storage> { 999 std::vector<unsigned> Positions; 1000 ParserClass Parser; 1001 1002 virtual enum ValueExpected getValueExpectedFlagDefault() const { 1003 return Parser.getValueExpectedFlagDefault(); 1004 } 1005 virtual void getExtraOptionNames(SmallVectorImpl<const char*> &OptionNames) { 1006 return Parser.getExtraOptionNames(OptionNames); 1007 } 1008 1009 virtual bool handleOccurrence(unsigned pos, StringRef ArgName, StringRef Arg){ 1010 typename ParserClass::parser_data_type Val = 1011 typename ParserClass::parser_data_type(); 1012 if (Parser.parse(*this, ArgName, Arg, Val)) 1013 return true; // Parse Error! 1014 list_storage<DataType, Storage>::addValue(Val); 1015 setPosition(pos); 1016 Positions.push_back(pos); 1017 return false; 1018 } 1019 1020 // Forward printing stuff to the parser... 1021 virtual size_t getOptionWidth() const {return Parser.getOptionWidth(*this);} 1022 virtual void printOptionInfo(size_t GlobalWidth) const { 1023 Parser.printOptionInfo(*this, GlobalWidth); 1024 } 1025 1026 void done() { 1027 addArgument(); 1028 Parser.initialize(*this); 1029 } 1030public: 1031 ParserClass &getParser() { return Parser; } 1032 1033 unsigned getPosition(unsigned optnum) const { 1034 assert(optnum < this->size() && "Invalid option index"); 1035 return Positions[optnum]; 1036 } 1037 1038 void setNumAdditionalVals(unsigned n) { 1039 Option::setNumAdditionalVals(n); 1040 } 1041 1042 // One option... 1043 template<class M0t> 1044 explicit list(const M0t &M0) : Option(ZeroOrMore | NotHidden) { 1045 apply(M0, this); 1046 done(); 1047 } 1048 // Two options... 1049 template<class M0t, class M1t> 1050 list(const M0t &M0, const M1t &M1) : Option(ZeroOrMore | NotHidden) { 1051 apply(M0, this); apply(M1, this); 1052 done(); 1053 } 1054 // Three options... 1055 template<class M0t, class M1t, class M2t> 1056 list(const M0t &M0, const M1t &M1, const M2t &M2) 1057 : Option(ZeroOrMore | NotHidden) { 1058 apply(M0, this); apply(M1, this); apply(M2, this); 1059 done(); 1060 } 1061 // Four options... 1062 template<class M0t, class M1t, class M2t, class M3t> 1063 list(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3) 1064 : Option(ZeroOrMore | NotHidden) { 1065 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1066 done(); 1067 } 1068 // Five options... 1069 template<class M0t, class M1t, class M2t, class M3t, class M4t> 1070 list(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 1071 const M4t &M4) : Option(ZeroOrMore | NotHidden) { 1072 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1073 apply(M4, this); 1074 done(); 1075 } 1076 // Six options... 1077 template<class M0t, class M1t, class M2t, class M3t, 1078 class M4t, class M5t> 1079 list(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 1080 const M4t &M4, const M5t &M5) : Option(ZeroOrMore | NotHidden) { 1081 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1082 apply(M4, this); apply(M5, this); 1083 done(); 1084 } 1085 // Seven options... 1086 template<class M0t, class M1t, class M2t, class M3t, 1087 class M4t, class M5t, class M6t> 1088 list(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 1089 const M4t &M4, const M5t &M5, const M6t &M6) 1090 : Option(ZeroOrMore | NotHidden) { 1091 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1092 apply(M4, this); apply(M5, this); apply(M6, this); 1093 done(); 1094 } 1095 // Eight options... 1096 template<class M0t, class M1t, class M2t, class M3t, 1097 class M4t, class M5t, class M6t, class M7t> 1098 list(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 1099 const M4t &M4, const M5t &M5, const M6t &M6, 1100 const M7t &M7) : Option(ZeroOrMore | NotHidden) { 1101 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1102 apply(M4, this); apply(M5, this); apply(M6, this); apply(M7, this); 1103 done(); 1104 } 1105}; 1106 1107// multi_val - Modifier to set the number of additional values. 1108struct multi_val { 1109 unsigned AdditionalVals; 1110 explicit multi_val(unsigned N) : AdditionalVals(N) {} 1111 1112 template <typename D, typename S, typename P> 1113 void apply(list<D, S, P> &L) const { L.setNumAdditionalVals(AdditionalVals); } 1114}; 1115 1116 1117//===----------------------------------------------------------------------===// 1118// bits_storage class 1119 1120// Default storage class definition: external storage. This implementation 1121// assumes the user will specify a variable to store the data into with the 1122// cl::location(x) modifier. 1123// 1124template<class DataType, class StorageClass> 1125class bits_storage { 1126 unsigned *Location; // Where to store the bits... 1127 1128 template<class T> 1129 static unsigned Bit(const T &V) { 1130 unsigned BitPos = reinterpret_cast<unsigned>(V); 1131 assert(BitPos < sizeof(unsigned) * CHAR_BIT && 1132 "enum exceeds width of bit vector!"); 1133 return 1 << BitPos; 1134 } 1135 1136public: 1137 bits_storage() : Location(0) {} 1138 1139 bool setLocation(Option &O, unsigned &L) { 1140 if (Location) 1141 return O.error("cl::location(x) specified more than once!"); 1142 Location = &L; 1143 return false; 1144 } 1145 1146 template<class T> 1147 void addValue(const T &V) { 1148 assert(Location != 0 && "cl::location(...) not specified for a command " 1149 "line option with external storage!"); 1150 *Location |= Bit(V); 1151 } 1152 1153 unsigned getBits() { return *Location; } 1154 1155 template<class T> 1156 bool isSet(const T &V) { 1157 return (*Location & Bit(V)) != 0; 1158 } 1159}; 1160 1161 1162// Define how to hold bits. Since we can inherit from a class, we do so. 1163// This makes us exactly compatible with the bits in all cases that it is used. 1164// 1165template<class DataType> 1166class bits_storage<DataType, bool> { 1167 unsigned Bits; // Where to store the bits... 1168 1169 template<class T> 1170 static unsigned Bit(const T &V) { 1171 unsigned BitPos = (unsigned)V; 1172 assert(BitPos < sizeof(unsigned) * CHAR_BIT && 1173 "enum exceeds width of bit vector!"); 1174 return 1 << BitPos; 1175 } 1176 1177public: 1178 template<class T> 1179 void addValue(const T &V) { 1180 Bits |= Bit(V); 1181 } 1182 1183 unsigned getBits() { return Bits; } 1184 1185 template<class T> 1186 bool isSet(const T &V) { 1187 return (Bits & Bit(V)) != 0; 1188 } 1189}; 1190 1191 1192//===----------------------------------------------------------------------===// 1193// bits - A bit vector of command options. 1194// 1195template <class DataType, class Storage = bool, 1196 class ParserClass = parser<DataType> > 1197class bits : public Option, public bits_storage<DataType, Storage> { 1198 std::vector<unsigned> Positions; 1199 ParserClass Parser; 1200 1201 virtual enum ValueExpected getValueExpectedFlagDefault() const { 1202 return Parser.getValueExpectedFlagDefault(); 1203 } 1204 virtual void getExtraOptionNames(SmallVectorImpl<const char*> &OptionNames) { 1205 return Parser.getExtraOptionNames(OptionNames); 1206 } 1207 1208 virtual bool handleOccurrence(unsigned pos, StringRef ArgName, StringRef Arg){ 1209 typename ParserClass::parser_data_type Val = 1210 typename ParserClass::parser_data_type(); 1211 if (Parser.parse(*this, ArgName, Arg, Val)) 1212 return true; // Parse Error! 1213 addValue(Val); 1214 setPosition(pos); 1215 Positions.push_back(pos); 1216 return false; 1217 } 1218 1219 // Forward printing stuff to the parser... 1220 virtual size_t getOptionWidth() const {return Parser.getOptionWidth(*this);} 1221 virtual void printOptionInfo(size_t GlobalWidth) const { 1222 Parser.printOptionInfo(*this, GlobalWidth); 1223 } 1224 1225 void done() { 1226 addArgument(); 1227 Parser.initialize(*this); 1228 } 1229public: 1230 ParserClass &getParser() { return Parser; } 1231 1232 unsigned getPosition(unsigned optnum) const { 1233 assert(optnum < this->size() && "Invalid option index"); 1234 return Positions[optnum]; 1235 } 1236 1237 // One option... 1238 template<class M0t> 1239 explicit bits(const M0t &M0) : Option(ZeroOrMore | NotHidden) { 1240 apply(M0, this); 1241 done(); 1242 } 1243 // Two options... 1244 template<class M0t, class M1t> 1245 bits(const M0t &M0, const M1t &M1) : Option(ZeroOrMore | NotHidden) { 1246 apply(M0, this); apply(M1, this); 1247 done(); 1248 } 1249 // Three options... 1250 template<class M0t, class M1t, class M2t> 1251 bits(const M0t &M0, const M1t &M1, const M2t &M2) 1252 : Option(ZeroOrMore | NotHidden) { 1253 apply(M0, this); apply(M1, this); apply(M2, this); 1254 done(); 1255 } 1256 // Four options... 1257 template<class M0t, class M1t, class M2t, class M3t> 1258 bits(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3) 1259 : Option(ZeroOrMore | NotHidden) { 1260 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1261 done(); 1262 } 1263 // Five options... 1264 template<class M0t, class M1t, class M2t, class M3t, class M4t> 1265 bits(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 1266 const M4t &M4) : Option(ZeroOrMore | NotHidden) { 1267 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1268 apply(M4, this); 1269 done(); 1270 } 1271 // Six options... 1272 template<class M0t, class M1t, class M2t, class M3t, 1273 class M4t, class M5t> 1274 bits(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 1275 const M4t &M4, const M5t &M5) : Option(ZeroOrMore | NotHidden) { 1276 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1277 apply(M4, this); apply(M5, this); 1278 done(); 1279 } 1280 // Seven options... 1281 template<class M0t, class M1t, class M2t, class M3t, 1282 class M4t, class M5t, class M6t> 1283 bits(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 1284 const M4t &M4, const M5t &M5, const M6t &M6) 1285 : Option(ZeroOrMore | NotHidden) { 1286 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1287 apply(M4, this); apply(M5, this); apply(M6, this); 1288 done(); 1289 } 1290 // Eight options... 1291 template<class M0t, class M1t, class M2t, class M3t, 1292 class M4t, class M5t, class M6t, class M7t> 1293 bits(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 1294 const M4t &M4, const M5t &M5, const M6t &M6, 1295 const M7t &M7) : Option(ZeroOrMore | NotHidden) { 1296 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1297 apply(M4, this); apply(M5, this); apply(M6, this); apply(M7, this); 1298 done(); 1299 } 1300}; 1301 1302//===----------------------------------------------------------------------===// 1303// Aliased command line option (alias this name to a preexisting name) 1304// 1305 1306class alias : public Option { 1307 Option *AliasFor; 1308 virtual bool handleOccurrence(unsigned pos, StringRef /*ArgName*/, 1309 StringRef Arg) { 1310 return AliasFor->handleOccurrence(pos, AliasFor->ArgStr, Arg); 1311 } 1312 // Handle printing stuff... 1313 virtual size_t getOptionWidth() const; 1314 virtual void printOptionInfo(size_t GlobalWidth) const; 1315 1316 void done() { 1317 if (!hasArgStr()) 1318 error("cl::alias must have argument name specified!"); 1319 if (AliasFor == 0) 1320 error("cl::alias must have an cl::aliasopt(option) specified!"); 1321 addArgument(); 1322 } 1323public: 1324 void setAliasFor(Option &O) { 1325 if (AliasFor) 1326 error("cl::alias must only have one cl::aliasopt(...) specified!"); 1327 AliasFor = &O; 1328 } 1329 1330 // One option... 1331 template<class M0t> 1332 explicit alias(const M0t &M0) : Option(Optional | Hidden), AliasFor(0) { 1333 apply(M0, this); 1334 done(); 1335 } 1336 // Two options... 1337 template<class M0t, class M1t> 1338 alias(const M0t &M0, const M1t &M1) : Option(Optional | Hidden), AliasFor(0) { 1339 apply(M0, this); apply(M1, this); 1340 done(); 1341 } 1342 // Three options... 1343 template<class M0t, class M1t, class M2t> 1344 alias(const M0t &M0, const M1t &M1, const M2t &M2) 1345 : Option(Optional | Hidden), AliasFor(0) { 1346 apply(M0, this); apply(M1, this); apply(M2, this); 1347 done(); 1348 } 1349 // Four options... 1350 template<class M0t, class M1t, class M2t, class M3t> 1351 alias(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3) 1352 : Option(Optional | Hidden), AliasFor(0) { 1353 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1354 done(); 1355 } 1356}; 1357 1358// aliasfor - Modifier to set the option an alias aliases. 1359struct aliasopt { 1360 Option &Opt; 1361 explicit aliasopt(Option &O) : Opt(O) {} 1362 void apply(alias &A) const { A.setAliasFor(Opt); } 1363}; 1364 1365// extrahelp - provide additional help at the end of the normal help 1366// output. All occurrences of cl::extrahelp will be accumulated and 1367// printed to stderr at the end of the regular help, just before 1368// exit is called. 1369struct extrahelp { 1370 const char * morehelp; 1371 explicit extrahelp(const char* help); 1372}; 1373 1374void PrintVersionMessage(); 1375// This function just prints the help message, exactly the same way as if the 1376// -help option had been given on the command line. 1377// NOTE: THIS FUNCTION TERMINATES THE PROGRAM! 1378void PrintHelpMessage(); 1379 1380} // End namespace cl 1381 1382} // End namespace llvm 1383 1384#endif 1385