CommandLine.h revision 5c1f715d4b68d4adb54fd0bf37c099039d6849d3
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/DataTypes.h" 25#include "llvm/Support/Compiler.h" 26#include "llvm/ADT/SmallVector.h" 27#include <cassert> 28#include <cstdarg> 29#include <string> 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 AllowInverse = 0x1000, // Can this option take a -Xno- form? 130 MiscMask = 0x1E00 // Union of the above flags. 131}; 132 133 134 135//===----------------------------------------------------------------------===// 136// Option Base class 137// 138class alias; 139class Option { 140 friend class alias; 141 142 // handleOccurrences - Overriden by subclasses to handle the value passed into 143 // an argument. Should return true if there was an error processing the 144 // argument and the program should exit. 145 // 146 virtual bool handleOccurrence(unsigned pos, const char *ArgName, 147 const std::string &Arg) = 0; 148 149 virtual enum ValueExpected getValueExpectedFlagDefault() const { 150 return ValueOptional; 151 } 152 153 // Out of line virtual function to provide home for the class. 154 virtual void anchor(); 155 156 int NumOccurrences; // The number of times specified 157 int Flags; // Flags for the argument 158 unsigned Position; // Position of last occurrence of the option 159 unsigned AdditionalVals;// Greater than 0 for multi-valued option. 160 Option *NextRegistered; // Singly linked list of registered options. 161public: 162 const char *ArgStr; // The argument string itself (ex: "help", "o") 163 const char *HelpStr; // The descriptive text message for --help 164 const char *ValueStr; // String describing what the value of this option is 165 166 inline enum NumOccurrences getNumOccurrencesFlag() const { 167 return static_cast<enum NumOccurrences>(Flags & OccurrencesMask); 168 } 169 inline enum ValueExpected getValueExpectedFlag() const { 170 int VE = Flags & ValueMask; 171 return VE ? static_cast<enum ValueExpected>(VE) 172 : getValueExpectedFlagDefault(); 173 } 174 inline enum OptionHidden getOptionHiddenFlag() const { 175 return static_cast<enum OptionHidden>(Flags & HiddenMask); 176 } 177 inline enum FormattingFlags getFormattingFlag() const { 178 return static_cast<enum FormattingFlags>(Flags & FormattingMask); 179 } 180 inline unsigned getMiscFlags() const { 181 return Flags & MiscMask; 182 } 183 inline unsigned getPosition() const { return Position; } 184 inline unsigned getNumAdditionalVals() const { return AdditionalVals; } 185 186 // hasArgStr - Return true if the argstr != "" 187 bool hasArgStr() const { return ArgStr[0] != 0; } 188 189 //-------------------------------------------------------------------------=== 190 // Accessor functions set by OptionModifiers 191 // 192 void setArgStr(const char *S) { ArgStr = S; } 193 void setDescription(const char *S) { HelpStr = S; } 194 void setValueStr(const char *S) { ValueStr = S; } 195 196 void setFlag(unsigned Flag, unsigned FlagMask) { 197 Flags &= ~FlagMask; 198 Flags |= Flag; 199 } 200 201 void setNumOccurrencesFlag(enum NumOccurrences Val) { 202 setFlag(Val, OccurrencesMask); 203 } 204 void setValueExpectedFlag(enum ValueExpected Val) { setFlag(Val, ValueMask); } 205 void setHiddenFlag(enum OptionHidden Val) { setFlag(Val, HiddenMask); } 206 void setFormattingFlag(enum FormattingFlags V) { setFlag(V, FormattingMask); } 207 void setMiscFlag(enum MiscFlags M) { setFlag(M, M); } 208 void setPosition(unsigned pos) { Position = pos; } 209protected: 210 explicit Option(unsigned DefaultFlags) 211 : NumOccurrences(0), Flags(DefaultFlags | NormalFormatting), Position(0), 212 AdditionalVals(0), NextRegistered(0), 213 ArgStr(""), HelpStr(""), ValueStr("") { 214 assert(getNumOccurrencesFlag() != 0 && 215 getOptionHiddenFlag() != 0 && "Not all default flags specified!"); 216 } 217 218 inline void setNumAdditionalVals(unsigned n) 219 { AdditionalVals = n; } 220public: 221 // addArgument - Register this argument with the commandline system. 222 // 223 void addArgument(); 224 225 Option *getNextRegisteredOption() const { return NextRegistered; } 226 227 // Return the width of the option tag for printing... 228 virtual size_t getOptionWidth() const = 0; 229 230 // printOptionInfo - Print out information about this option. The 231 // to-be-maintained width is specified. 232 // 233 virtual void printOptionInfo(size_t GlobalWidth) const = 0; 234 235 virtual void getExtraOptionNames(std::vector<const char*> &) {} 236 237 // addOccurrence - Wrapper around handleOccurrence that enforces Flags 238 // 239 bool addOccurrence(unsigned pos, const char *ArgName, 240 const std::string &Value, bool MultiArg = false); 241 242 // Prints option name followed by message. Always returns true. 243 bool error(std::string Message, const char *ArgName = 0); 244 245public: 246 inline int getNumOccurrences() const { return NumOccurrences; } 247 virtual ~Option() {} 248}; 249 250 251//===----------------------------------------------------------------------===// 252// Command line option modifiers that can be used to modify the behavior of 253// command line option parsers... 254// 255 256// desc - Modifier to set the description shown in the --help output... 257struct desc { 258 const char *Desc; 259 desc(const char *Str) : Desc(Str) {} 260 void apply(Option &O) const { O.setDescription(Desc); } 261}; 262 263// value_desc - Modifier to set the value description shown in the --help 264// output... 265struct value_desc { 266 const char *Desc; 267 value_desc(const char *Str) : Desc(Str) {} 268 void apply(Option &O) const { O.setValueStr(Desc); } 269}; 270 271// init - Specify a default (initial) value for the command line argument, if 272// the default constructor for the argument type does not give you what you 273// want. This is only valid on "opt" arguments, not on "list" arguments. 274// 275template<class Ty> 276struct initializer { 277 const Ty &Init; 278 initializer(const Ty &Val) : Init(Val) {} 279 280 template<class Opt> 281 void apply(Opt &O) const { O.setInitialValue(Init); } 282}; 283 284template<class Ty> 285initializer<Ty> init(const Ty &Val) { 286 return initializer<Ty>(Val); 287} 288 289 290// location - Allow the user to specify which external variable they want to 291// store the results of the command line argument processing into, if they don't 292// want to store it in the option itself. 293// 294template<class Ty> 295struct LocationClass { 296 Ty &Loc; 297 LocationClass(Ty &L) : Loc(L) {} 298 299 template<class Opt> 300 void apply(Opt &O) const { O.setLocation(O, Loc); } 301}; 302 303template<class Ty> 304LocationClass<Ty> location(Ty &L) { return LocationClass<Ty>(L); } 305 306 307//===----------------------------------------------------------------------===// 308// Enum valued command line option 309// 310#define clEnumVal(ENUMVAL, DESC) #ENUMVAL, int(ENUMVAL), DESC 311#define clEnumValN(ENUMVAL, FLAGNAME, DESC) FLAGNAME, int(ENUMVAL), DESC 312#define clEnumValEnd (reinterpret_cast<void*>(0)) 313 314// values - For custom data types, allow specifying a group of values together 315// as the values that go into the mapping that the option handler uses. Note 316// that the values list must always have a 0 at the end of the list to indicate 317// that the list has ended. 318// 319template<class DataType> 320class ValuesClass { 321 // Use a vector instead of a map, because the lists should be short, 322 // the overhead is less, and most importantly, it keeps them in the order 323 // inserted so we can print our option out nicely. 324 SmallVector<std::pair<const char *, std::pair<int, const char *> >,4> Values; 325 void processValues(va_list Vals); 326public: 327 ValuesClass(const char *EnumName, DataType Val, const char *Desc, 328 va_list ValueArgs) { 329 // Insert the first value, which is required. 330 Values.push_back(std::make_pair(EnumName, std::make_pair(Val, Desc))); 331 332 // Process the varargs portion of the values... 333 while (const char *enumName = va_arg(ValueArgs, const char *)) { 334 DataType EnumVal = static_cast<DataType>(va_arg(ValueArgs, int)); 335 const char *EnumDesc = va_arg(ValueArgs, const char *); 336 Values.push_back(std::make_pair(enumName, // Add value to value map 337 std::make_pair(EnumVal, EnumDesc))); 338 } 339 } 340 341 template<class Opt> 342 void apply(Opt &O) const { 343 for (unsigned i = 0, e = static_cast<unsigned>(Values.size()); 344 i != e; ++i) 345 O.getParser().addLiteralOption(Values[i].first, Values[i].second.first, 346 Values[i].second.second); 347 } 348}; 349 350template<class DataType> 351ValuesClass<DataType> END_WITH_NULL values(const char *Arg, DataType Val, 352 const char *Desc, ...) { 353 va_list ValueArgs; 354 va_start(ValueArgs, Desc); 355 ValuesClass<DataType> Vals(Arg, Val, Desc, ValueArgs); 356 va_end(ValueArgs); 357 return Vals; 358} 359 360 361//===----------------------------------------------------------------------===// 362// parser class - Parameterizable parser for different data types. By default, 363// known data types (string, int, bool) have specialized parsers, that do what 364// you would expect. The default parser, used for data types that are not 365// built-in, uses a mapping table to map specific options to values, which is 366// used, among other things, to handle enum types. 367 368//-------------------------------------------------- 369// generic_parser_base - This class holds all the non-generic code that we do 370// not need replicated for every instance of the generic parser. This also 371// allows us to put stuff into CommandLine.cpp 372// 373struct generic_parser_base { 374 virtual ~generic_parser_base() {} // Base class should have virtual-dtor 375 376 // getNumOptions - Virtual function implemented by generic subclass to 377 // indicate how many entries are in Values. 378 // 379 virtual unsigned getNumOptions() const = 0; 380 381 // getOption - Return option name N. 382 virtual const char *getOption(unsigned N) const = 0; 383 384 // getDescription - Return description N 385 virtual const char *getDescription(unsigned N) const = 0; 386 387 // Return the width of the option tag for printing... 388 virtual size_t getOptionWidth(const Option &O) const; 389 390 // printOptionInfo - Print out information about this option. The 391 // to-be-maintained width is specified. 392 // 393 virtual void printOptionInfo(const Option &O, size_t GlobalWidth) const; 394 395 void initialize(Option &O) { 396 // All of the modifiers for the option have been processed by now, so the 397 // argstr field should be stable, copy it down now. 398 // 399 hasArgStr = O.hasArgStr(); 400 } 401 402 void getExtraOptionNames(std::vector<const char*> &OptionNames) { 403 // If there has been no argstr specified, that means that we need to add an 404 // argument for every possible option. This ensures that our options are 405 // vectored to us. 406 if (!hasArgStr) 407 for (unsigned i = 0, e = getNumOptions(); i != e; ++i) 408 OptionNames.push_back(getOption(i)); 409 } 410 411 412 enum ValueExpected getValueExpectedFlagDefault() const { 413 // If there is an ArgStr specified, then we are of the form: 414 // 415 // -opt=O2 or -opt O2 or -optO2 416 // 417 // In which case, the value is required. Otherwise if an arg str has not 418 // been specified, we are of the form: 419 // 420 // -O2 or O2 or -la (where -l and -a are separate options) 421 // 422 // If this is the case, we cannot allow a value. 423 // 424 if (hasArgStr) 425 return ValueRequired; 426 else 427 return ValueDisallowed; 428 } 429 430 // findOption - Return the option number corresponding to the specified 431 // argument string. If the option is not found, getNumOptions() is returned. 432 // 433 unsigned findOption(const char *Name); 434 435protected: 436 bool hasArgStr; 437}; 438 439// Default parser implementation - This implementation depends on having a 440// mapping of recognized options to values of some sort. In addition to this, 441// each entry in the mapping also tracks a help message that is printed with the 442// command line option for --help. Because this is a simple mapping parser, the 443// data type can be any unsupported type. 444// 445template <class DataType> 446class parser : public generic_parser_base { 447protected: 448 SmallVector<std::pair<const char *, 449 std::pair<DataType, const char *> >, 8> Values; 450public: 451 typedef DataType parser_data_type; 452 453 // Implement virtual functions needed by generic_parser_base 454 unsigned getNumOptions() const { return unsigned(Values.size()); } 455 const char *getOption(unsigned N) const { return Values[N].first; } 456 const char *getDescription(unsigned N) const { 457 return Values[N].second.second; 458 } 459 460 // parse - Return true on error. 461 bool parse(Option &O, const char *ArgName, const std::string &Arg, 462 DataType &V) { 463 std::string ArgVal; 464 if (hasArgStr) 465 ArgVal = Arg; 466 else 467 ArgVal = ArgName; 468 469 for (unsigned i = 0, e = static_cast<unsigned>(Values.size()); 470 i != e; ++i) 471 if (ArgVal == Values[i].first) { 472 V = Values[i].second.first; 473 return false; 474 } 475 476 return O.error(": Cannot find option named '" + ArgVal + "'!"); 477 } 478 479 /// addLiteralOption - Add an entry to the mapping table. 480 /// 481 template <class DT> 482 void addLiteralOption(const char *Name, const DT &V, const char *HelpStr) { 483 assert(findOption(Name) == Values.size() && "Option already exists!"); 484 Values.push_back(std::make_pair(Name, 485 std::make_pair(static_cast<DataType>(V),HelpStr))); 486 MarkOptionsChanged(); 487 } 488 489 /// removeLiteralOption - Remove the specified option. 490 /// 491 void removeLiteralOption(const char *Name) { 492 unsigned N = findOption(Name); 493 assert(N != Values.size() && "Option not found!"); 494 Values.erase(Values.begin()+N); 495 } 496}; 497 498//-------------------------------------------------- 499// basic_parser - Super class of parsers to provide boilerplate code 500// 501struct basic_parser_impl { // non-template implementation of basic_parser<t> 502 virtual ~basic_parser_impl() {} 503 504 enum ValueExpected getValueExpectedFlagDefault() const { 505 return ValueRequired; 506 } 507 508 void getExtraOptionNames(std::vector<const char*> &) {} 509 510 void initialize(Option &) {} 511 512 // Return the width of the option tag for printing... 513 size_t getOptionWidth(const Option &O) const; 514 515 // printOptionInfo - Print out information about this option. The 516 // to-be-maintained width is specified. 517 // 518 void printOptionInfo(const Option &O, size_t GlobalWidth) const; 519 520 // getValueName - Overload in subclass to provide a better default value. 521 virtual const char *getValueName() const { return "value"; } 522 523 // An out-of-line virtual method to provide a 'home' for this class. 524 virtual void anchor(); 525}; 526 527// basic_parser - The real basic parser is just a template wrapper that provides 528// a typedef for the provided data type. 529// 530template<class DataType> 531struct basic_parser : public basic_parser_impl { 532 typedef DataType parser_data_type; 533}; 534 535//-------------------------------------------------- 536// parser<bool> 537// 538template<> 539class parser<bool> : public basic_parser<bool> { 540 bool IsInvertable; // Should we synthezise a -xno- style option? 541 const char *ArgStr; 542public: 543 void getExtraOptionNames(std::vector<const char*> &OptionNames) { 544 if (IsInvertable) { 545 char *s = new char [strlen(ArgStr) + 3 + 1]; 546 s[0] = ArgStr[0]; 547 if (strncmp(ArgStr+1, "no-", 3) == 0) 548 strcpy(&s[1], &ArgStr[4]); 549 else { 550 s[1] = 'n'; 551 s[2] = 'o'; 552 s[3] = '-'; 553 strcpy(&s[4], ArgStr+1); 554 } 555 OptionNames.push_back(s); 556 } 557 } 558 559 // parse - Return true on error. 560 bool parse(Option &O, const char *ArgName, const std::string &Arg, bool &Val); 561 562 template <class Opt> 563 void initialize(Opt &O) { 564 if (O.getMiscFlags() & llvm::cl::AllowInverse) 565 IsInvertable = true; 566 else 567 IsInvertable = false; 568 ArgStr = O.ArgStr; 569 } 570 571 enum ValueExpected getValueExpectedFlagDefault() const { 572 return ValueOptional; 573 } 574 575 // getValueName - Do not print =<value> at all. 576 virtual const char *getValueName() const { return 0; } 577 578 // An out-of-line virtual method to provide a 'home' for this class. 579 virtual void anchor(); 580}; 581 582EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<bool>); 583 584//-------------------------------------------------- 585// parser<boolOrDefault> 586enum boolOrDefault { BOU_UNSET, BOU_TRUE, BOU_FALSE }; 587template<> 588class parser<boolOrDefault> : public basic_parser<boolOrDefault> { 589public: 590 // parse - Return true on error. 591 bool parse(Option &O, const char *ArgName, const std::string &Arg, 592 boolOrDefault &Val); 593 594 enum ValueExpected getValueExpectedFlagDefault() const { 595 return ValueOptional; 596 } 597 598 // getValueName - Do not print =<value> at all. 599 virtual const char *getValueName() const { return 0; } 600 601 // An out-of-line virtual method to provide a 'home' for this class. 602 virtual void anchor(); 603}; 604 605EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<boolOrDefault>); 606 607//-------------------------------------------------- 608// parser<int> 609// 610template<> 611class parser<int> : public basic_parser<int> { 612public: 613 // parse - Return true on error. 614 bool parse(Option &O, const char *ArgName, const std::string &Arg, int &Val); 615 616 // getValueName - Overload in subclass to provide a better default value. 617 virtual const char *getValueName() const { return "int"; } 618 619 // An out-of-line virtual method to provide a 'home' for this class. 620 virtual void anchor(); 621}; 622 623EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<int>); 624 625 626//-------------------------------------------------- 627// parser<unsigned> 628// 629template<> 630class parser<unsigned> : public basic_parser<unsigned> { 631public: 632 // parse - Return true on error. 633 bool parse(Option &O, const char *AN, const std::string &Arg, unsigned &Val); 634 635 // getValueName - Overload in subclass to provide a better default value. 636 virtual const char *getValueName() const { return "uint"; } 637 638 // An out-of-line virtual method to provide a 'home' for this class. 639 virtual void anchor(); 640}; 641 642EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<unsigned>); 643 644//-------------------------------------------------- 645// parser<double> 646// 647template<> 648class parser<double> : public basic_parser<double> { 649public: 650 // parse - Return true on error. 651 bool parse(Option &O, const char *AN, const std::string &Arg, double &Val); 652 653 // getValueName - Overload in subclass to provide a better default value. 654 virtual const char *getValueName() const { return "number"; } 655 656 // An out-of-line virtual method to provide a 'home' for this class. 657 virtual void anchor(); 658}; 659 660EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<double>); 661 662//-------------------------------------------------- 663// parser<float> 664// 665template<> 666class parser<float> : public basic_parser<float> { 667public: 668 // parse - Return true on error. 669 bool parse(Option &O, const char *AN, const std::string &Arg, float &Val); 670 671 // getValueName - Overload in subclass to provide a better default value. 672 virtual const char *getValueName() const { return "number"; } 673 674 // An out-of-line virtual method to provide a 'home' for this class. 675 virtual void anchor(); 676}; 677 678EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<float>); 679 680//-------------------------------------------------- 681// parser<std::string> 682// 683template<> 684class parser<std::string> : public basic_parser<std::string> { 685public: 686 // parse - Return true on error. 687 bool parse(Option &, const char *, const std::string &Arg, 688 std::string &Value) { 689 Value = Arg; 690 return false; 691 } 692 693 // getValueName - Overload in subclass to provide a better default value. 694 virtual const char *getValueName() const { return "string"; } 695 696 // An out-of-line virtual method to provide a 'home' for this class. 697 virtual void anchor(); 698}; 699 700EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<std::string>); 701 702//===----------------------------------------------------------------------===// 703// applicator class - This class is used because we must use partial 704// specialization to handle literal string arguments specially (const char* does 705// not correctly respond to the apply method). Because the syntax to use this 706// is a pain, we have the 'apply' method below to handle the nastiness... 707// 708template<class Mod> struct applicator { 709 template<class Opt> 710 static void opt(const Mod &M, Opt &O) { M.apply(O); } 711}; 712 713// Handle const char* as a special case... 714template<unsigned n> struct applicator<char[n]> { 715 template<class Opt> 716 static void opt(const char *Str, Opt &O) { O.setArgStr(Str); } 717}; 718template<unsigned n> struct applicator<const char[n]> { 719 template<class Opt> 720 static void opt(const char *Str, Opt &O) { O.setArgStr(Str); } 721}; 722template<> struct applicator<const char*> { 723 template<class Opt> 724 static void opt(const char *Str, Opt &O) { O.setArgStr(Str); } 725}; 726 727template<> struct applicator<NumOccurrences> { 728 static void opt(NumOccurrences NO, Option &O) { O.setNumOccurrencesFlag(NO); } 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() { 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}; 785 786 787// Define how to hold a class type object, such as a string. Since we can 788// inherit from a class, we do so. This makes us exactly compatible with the 789// object in all cases that it is used. 790// 791template<class DataType> 792class opt_storage<DataType,false,true> : public DataType { 793public: 794 template<class T> 795 void setValue(const T &V) { DataType::operator=(V); } 796 797 DataType &getValue() { return *this; } 798 const DataType &getValue() const { return *this; } 799}; 800 801// Define a partial specialization to handle things we cannot inherit from. In 802// this case, we store an instance through containment, and overload operators 803// to get at the value. 804// 805template<class DataType> 806class opt_storage<DataType, false, false> { 807public: 808 DataType Value; 809 810 // Make sure we initialize the value with the default constructor for the 811 // type. 812 opt_storage() : Value(DataType()) {} 813 814 template<class T> 815 void setValue(const T &V) { Value = V; } 816 DataType &getValue() { return Value; } 817 DataType getValue() const { return Value; } 818 819 // If the datatype is a pointer, support -> on it. 820 DataType operator->() const { return Value; } 821}; 822 823 824//===----------------------------------------------------------------------===// 825// opt - A scalar command line option. 826// 827template <class DataType, bool ExternalStorage = false, 828 class ParserClass = parser<DataType> > 829class opt : public Option, 830 public opt_storage<DataType, ExternalStorage, 831 is_class<DataType>::value> { 832 ParserClass Parser; 833 834 virtual bool handleOccurrence(unsigned pos, const char *ArgName, 835 const std::string &Arg) { 836 typename ParserClass::parser_data_type Val = 837 typename ParserClass::parser_data_type(); 838 if (Parser.parse(*this, ArgName, Arg, Val)) 839 return true; // Parse error! 840 this->setValue(Val); 841 this->setPosition(pos); 842 return false; 843 } 844 845 virtual enum ValueExpected getValueExpectedFlagDefault() const { 846 return Parser.getValueExpectedFlagDefault(); 847 } 848 virtual void getExtraOptionNames(std::vector<const char*> &OptionNames) { 849 return Parser.getExtraOptionNames(OptionNames); 850 } 851 852 // Forward printing stuff to the parser... 853 virtual size_t getOptionWidth() const {return Parser.getOptionWidth(*this);} 854 virtual void printOptionInfo(size_t GlobalWidth) const { 855 Parser.printOptionInfo(*this, GlobalWidth); 856 } 857 858 void done() { 859 addArgument(); 860 Parser.initialize(*this); 861 } 862public: 863 // setInitialValue - Used by the cl::init modifier... 864 void setInitialValue(const DataType &V) { this->setValue(V); } 865 866 ParserClass &getParser() { return Parser; } 867 868 operator DataType() const { return this->getValue(); } 869 870 template<class T> 871 DataType &operator=(const T &Val) { 872 this->setValue(Val); 873 return this->getValue(); 874 } 875 876 // One option... 877 template<class M0t> 878 explicit opt(const M0t &M0) : Option(Optional | NotHidden) { 879 apply(M0, this); 880 done(); 881 } 882 883 // Two options... 884 template<class M0t, class M1t> 885 opt(const M0t &M0, const M1t &M1) : Option(Optional | NotHidden) { 886 apply(M0, this); apply(M1, this); 887 done(); 888 } 889 890 // Three options... 891 template<class M0t, class M1t, class M2t> 892 opt(const M0t &M0, const M1t &M1, 893 const M2t &M2) : Option(Optional | NotHidden) { 894 apply(M0, this); apply(M1, this); apply(M2, this); 895 done(); 896 } 897 // Four options... 898 template<class M0t, class M1t, class M2t, class M3t> 899 opt(const M0t &M0, const M1t &M1, const M2t &M2, 900 const M3t &M3) : Option(Optional | NotHidden) { 901 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 902 done(); 903 } 904 // Five options... 905 template<class M0t, class M1t, class M2t, class M3t, class M4t> 906 opt(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 907 const M4t &M4) : Option(Optional | NotHidden) { 908 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 909 apply(M4, this); 910 done(); 911 } 912 // Six options... 913 template<class M0t, class M1t, class M2t, class M3t, 914 class M4t, class M5t> 915 opt(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 916 const M4t &M4, const M5t &M5) : Option(Optional | NotHidden) { 917 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 918 apply(M4, this); apply(M5, this); 919 done(); 920 } 921 // Seven options... 922 template<class M0t, class M1t, class M2t, class M3t, 923 class M4t, class M5t, class M6t> 924 opt(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 925 const M4t &M4, const M5t &M5, 926 const M6t &M6) : Option(Optional | NotHidden) { 927 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 928 apply(M4, this); apply(M5, this); apply(M6, this); 929 done(); 930 } 931 // Eight options... 932 template<class M0t, class M1t, class M2t, class M3t, 933 class M4t, class M5t, class M6t, class M7t> 934 opt(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 935 const M4t &M4, const M5t &M5, const M6t &M6, 936 const M7t &M7) : Option(Optional | NotHidden) { 937 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 938 apply(M4, this); apply(M5, this); apply(M6, this); apply(M7, this); 939 done(); 940 } 941}; 942 943EXTERN_TEMPLATE_INSTANTIATION(class opt<unsigned>); 944EXTERN_TEMPLATE_INSTANTIATION(class opt<int>); 945EXTERN_TEMPLATE_INSTANTIATION(class opt<std::string>); 946EXTERN_TEMPLATE_INSTANTIATION(class opt<bool>); 947 948//===----------------------------------------------------------------------===// 949// list_storage class 950 951// Default storage class definition: external storage. This implementation 952// assumes the user will specify a variable to store the data into with the 953// cl::location(x) modifier. 954// 955template<class DataType, class StorageClass> 956class list_storage { 957 StorageClass *Location; // Where to store the object... 958 959public: 960 list_storage() : Location(0) {} 961 962 bool setLocation(Option &O, StorageClass &L) { 963 if (Location) 964 return O.error(": cl::location(x) specified more than once!"); 965 Location = &L; 966 return false; 967 } 968 969 template<class T> 970 void addValue(const T &V) { 971 assert(Location != 0 && "cl::location(...) not specified for a command " 972 "line option with external storage!"); 973 Location->push_back(V); 974 } 975}; 976 977 978// Define how to hold a class type object, such as a string. Since we can 979// inherit from a class, we do so. This makes us exactly compatible with the 980// object in all cases that it is used. 981// 982template<class DataType> 983class list_storage<DataType, bool> : public std::vector<DataType> { 984public: 985 template<class T> 986 void addValue(const T &V) { push_back(V); } 987}; 988 989 990//===----------------------------------------------------------------------===// 991// list - A list of command line options. 992// 993template <class DataType, class Storage = bool, 994 class ParserClass = parser<DataType> > 995class list : public Option, public list_storage<DataType, Storage> { 996 std::vector<unsigned> Positions; 997 ParserClass Parser; 998 999 virtual enum ValueExpected getValueExpectedFlagDefault() const { 1000 return Parser.getValueExpectedFlagDefault(); 1001 } 1002 virtual void getExtraOptionNames(std::vector<const char*> &OptionNames) { 1003 return Parser.getExtraOptionNames(OptionNames); 1004 } 1005 1006 virtual bool handleOccurrence(unsigned pos, const char *ArgName, 1007 const std::string &Arg) { 1008 typename ParserClass::parser_data_type Val = 1009 typename ParserClass::parser_data_type(); 1010 if (Parser.parse(*this, ArgName, Arg, Val)) 1011 return true; // Parse Error! 1012 addValue(Val); 1013 setPosition(pos); 1014 Positions.push_back(pos); 1015 return false; 1016 } 1017 1018 // Forward printing stuff to the parser... 1019 virtual size_t getOptionWidth() const {return Parser.getOptionWidth(*this);} 1020 virtual void printOptionInfo(size_t GlobalWidth) const { 1021 Parser.printOptionInfo(*this, GlobalWidth); 1022 } 1023 1024 void done() { 1025 addArgument(); 1026 Parser.initialize(*this); 1027 } 1028public: 1029 ParserClass &getParser() { return Parser; } 1030 1031 unsigned getPosition(unsigned optnum) const { 1032 assert(optnum < this->size() && "Invalid option index"); 1033 return Positions[optnum]; 1034 } 1035 1036 void setNumAdditionalVals(unsigned n) { 1037 Option::setNumAdditionalVals(n); 1038 } 1039 1040 // One option... 1041 template<class M0t> 1042 explicit list(const M0t &M0) : Option(ZeroOrMore | NotHidden) { 1043 apply(M0, this); 1044 done(); 1045 } 1046 // Two options... 1047 template<class M0t, class M1t> 1048 list(const M0t &M0, const M1t &M1) : Option(ZeroOrMore | NotHidden) { 1049 apply(M0, this); apply(M1, this); 1050 done(); 1051 } 1052 // Three options... 1053 template<class M0t, class M1t, class M2t> 1054 list(const M0t &M0, const M1t &M1, const M2t &M2) 1055 : Option(ZeroOrMore | NotHidden) { 1056 apply(M0, this); apply(M1, this); apply(M2, this); 1057 done(); 1058 } 1059 // Four options... 1060 template<class M0t, class M1t, class M2t, class M3t> 1061 list(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3) 1062 : Option(ZeroOrMore | NotHidden) { 1063 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1064 done(); 1065 } 1066 // Five options... 1067 template<class M0t, class M1t, class M2t, class M3t, class M4t> 1068 list(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 1069 const M4t &M4) : Option(ZeroOrMore | NotHidden) { 1070 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1071 apply(M4, this); 1072 done(); 1073 } 1074 // Six options... 1075 template<class M0t, class M1t, class M2t, class M3t, 1076 class M4t, class M5t> 1077 list(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 1078 const M4t &M4, const M5t &M5) : Option(ZeroOrMore | NotHidden) { 1079 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1080 apply(M4, this); apply(M5, this); 1081 done(); 1082 } 1083 // Seven options... 1084 template<class M0t, class M1t, class M2t, class M3t, 1085 class M4t, class M5t, class M6t> 1086 list(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 1087 const M4t &M4, const M5t &M5, const M6t &M6) 1088 : Option(ZeroOrMore | NotHidden) { 1089 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1090 apply(M4, this); apply(M5, this); apply(M6, this); 1091 done(); 1092 } 1093 // Eight options... 1094 template<class M0t, class M1t, class M2t, class M3t, 1095 class M4t, class M5t, class M6t, class M7t> 1096 list(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 1097 const M4t &M4, const M5t &M5, const M6t &M6, 1098 const M7t &M7) : Option(ZeroOrMore | NotHidden) { 1099 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1100 apply(M4, this); apply(M5, this); apply(M6, this); apply(M7, this); 1101 done(); 1102 } 1103}; 1104 1105// multi_arg - Modifier to set the number of additional values. 1106struct multi_val { 1107 unsigned AdditionalVals; 1108 explicit multi_val(unsigned N) : AdditionalVals(N) {} 1109 1110 template <typename D, typename S, typename P> 1111 void apply(list<D, S, P> &L) const { L.setNumAdditionalVals(AdditionalVals); } 1112}; 1113 1114 1115//===----------------------------------------------------------------------===// 1116// bits_storage class 1117 1118// Default storage class definition: external storage. This implementation 1119// assumes the user will specify a variable to store the data into with the 1120// cl::location(x) modifier. 1121// 1122template<class DataType, class StorageClass> 1123class bits_storage { 1124 unsigned *Location; // Where to store the bits... 1125 1126 template<class T> 1127 static unsigned Bit(const T &V) { 1128 unsigned BitPos = reinterpret_cast<unsigned>(V); 1129 assert(BitPos < sizeof(unsigned) * 8 && 1130 "enum exceeds width of bit vector!"); 1131 return 1 << BitPos; 1132 } 1133 1134public: 1135 bits_storage() : Location(0) {} 1136 1137 bool setLocation(Option &O, unsigned &L) { 1138 if (Location) 1139 return O.error(": cl::location(x) specified more than once!"); 1140 Location = &L; 1141 return false; 1142 } 1143 1144 template<class T> 1145 void addValue(const T &V) { 1146 assert(Location != 0 && "cl::location(...) not specified for a command " 1147 "line option with external storage!"); 1148 *Location |= Bit(V); 1149 } 1150 1151 unsigned getBits() { return *Location; } 1152 1153 template<class T> 1154 bool isSet(const T &V) { 1155 return (*Location & Bit(V)) != 0; 1156 } 1157}; 1158 1159 1160// Define how to hold bits. Since we can inherit from a class, we do so. 1161// This makes us exactly compatible with the bits in all cases that it is used. 1162// 1163template<class DataType> 1164class bits_storage<DataType, bool> { 1165 unsigned Bits; // Where to store the bits... 1166 1167 template<class T> 1168 static unsigned Bit(const T &V) { 1169 unsigned BitPos = reinterpret_cast<unsigned>(V); 1170 assert(BitPos < sizeof(unsigned) * 8 && 1171 "enum exceeds width of bit vector!"); 1172 return 1 << BitPos; 1173 } 1174 1175public: 1176 template<class T> 1177 void addValue(const T &V) { 1178 Bits |= Bit(V); 1179 } 1180 1181 unsigned getBits() { return Bits; } 1182 1183 template<class T> 1184 bool isSet(const T &V) { 1185 return (Bits & Bit(V)) != 0; 1186 } 1187}; 1188 1189 1190//===----------------------------------------------------------------------===// 1191// bits - A bit vector of command options. 1192// 1193template <class DataType, class Storage = bool, 1194 class ParserClass = parser<DataType> > 1195class bits : public Option, public bits_storage<DataType, Storage> { 1196 std::vector<unsigned> Positions; 1197 ParserClass Parser; 1198 1199 virtual enum ValueExpected getValueExpectedFlagDefault() const { 1200 return Parser.getValueExpectedFlagDefault(); 1201 } 1202 virtual void getExtraOptionNames(std::vector<const char*> &OptionNames) { 1203 return Parser.getExtraOptionNames(OptionNames); 1204 } 1205 1206 virtual bool handleOccurrence(unsigned pos, const char *ArgName, 1207 const std::string &Arg) { 1208 typename ParserClass::parser_data_type Val = 1209 typename ParserClass::parser_data_type(); 1210 if (Parser.parse(*this, ArgName, Arg, Val)) 1211 return true; // Parse Error! 1212 addValue(Val); 1213 setPosition(pos); 1214 Positions.push_back(pos); 1215 return false; 1216 } 1217 1218 // Forward printing stuff to the parser... 1219 virtual size_t getOptionWidth() const {return Parser.getOptionWidth(*this);} 1220 virtual void printOptionInfo(size_t GlobalWidth) const { 1221 Parser.printOptionInfo(*this, GlobalWidth); 1222 } 1223 1224 void done() { 1225 addArgument(); 1226 Parser.initialize(*this); 1227 } 1228public: 1229 ParserClass &getParser() { return Parser; } 1230 1231 unsigned getPosition(unsigned optnum) const { 1232 assert(optnum < this->size() && "Invalid option index"); 1233 return Positions[optnum]; 1234 } 1235 1236 // One option... 1237 template<class M0t> 1238 explicit bits(const M0t &M0) : Option(ZeroOrMore | NotHidden) { 1239 apply(M0, this); 1240 done(); 1241 } 1242 // Two options... 1243 template<class M0t, class M1t> 1244 bits(const M0t &M0, const M1t &M1) : Option(ZeroOrMore | NotHidden) { 1245 apply(M0, this); apply(M1, this); 1246 done(); 1247 } 1248 // Three options... 1249 template<class M0t, class M1t, class M2t> 1250 bits(const M0t &M0, const M1t &M1, const M2t &M2) 1251 : Option(ZeroOrMore | NotHidden) { 1252 apply(M0, this); apply(M1, this); apply(M2, this); 1253 done(); 1254 } 1255 // Four options... 1256 template<class M0t, class M1t, class M2t, class M3t> 1257 bits(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3) 1258 : Option(ZeroOrMore | NotHidden) { 1259 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1260 done(); 1261 } 1262 // Five options... 1263 template<class M0t, class M1t, class M2t, class M3t, class M4t> 1264 bits(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 1265 const M4t &M4) : Option(ZeroOrMore | NotHidden) { 1266 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1267 apply(M4, this); 1268 done(); 1269 } 1270 // Six options... 1271 template<class M0t, class M1t, class M2t, class M3t, 1272 class M4t, class M5t> 1273 bits(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 1274 const M4t &M4, const M5t &M5) : Option(ZeroOrMore | NotHidden) { 1275 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1276 apply(M4, this); apply(M5, this); 1277 done(); 1278 } 1279 // Seven options... 1280 template<class M0t, class M1t, class M2t, class M3t, 1281 class M4t, class M5t, class M6t> 1282 bits(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 1283 const M4t &M4, const M5t &M5, const M6t &M6) 1284 : Option(ZeroOrMore | NotHidden) { 1285 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1286 apply(M4, this); apply(M5, this); apply(M6, this); 1287 done(); 1288 } 1289 // Eight options... 1290 template<class M0t, class M1t, class M2t, class M3t, 1291 class M4t, class M5t, class M6t, class M7t> 1292 bits(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3, 1293 const M4t &M4, const M5t &M5, const M6t &M6, 1294 const M7t &M7) : Option(ZeroOrMore | NotHidden) { 1295 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1296 apply(M4, this); apply(M5, this); apply(M6, this); apply(M7, this); 1297 done(); 1298 } 1299}; 1300 1301//===----------------------------------------------------------------------===// 1302// Aliased command line option (alias this name to a preexisting name) 1303// 1304 1305class alias : public Option { 1306 Option *AliasFor; 1307 virtual bool handleOccurrence(unsigned pos, const char * /*ArgName*/, 1308 const std::string &Arg) { 1309 return AliasFor->handleOccurrence(pos, AliasFor->ArgStr, Arg); 1310 } 1311 // Handle printing stuff... 1312 virtual size_t getOptionWidth() const; 1313 virtual void printOptionInfo(size_t GlobalWidth) const; 1314 1315 void done() { 1316 if (!hasArgStr()) 1317 error(": cl::alias must have argument name specified!"); 1318 if (AliasFor == 0) 1319 error(": cl::alias must have an cl::aliasopt(option) specified!"); 1320 addArgument(); 1321 } 1322public: 1323 void setAliasFor(Option &O) { 1324 if (AliasFor) 1325 error(": cl::alias must only have one cl::aliasopt(...) specified!"); 1326 AliasFor = &O; 1327 } 1328 1329 // One option... 1330 template<class M0t> 1331 explicit alias(const M0t &M0) : Option(Optional | Hidden), AliasFor(0) { 1332 apply(M0, this); 1333 done(); 1334 } 1335 // Two options... 1336 template<class M0t, class M1t> 1337 alias(const M0t &M0, const M1t &M1) : Option(Optional | Hidden), AliasFor(0) { 1338 apply(M0, this); apply(M1, this); 1339 done(); 1340 } 1341 // Three options... 1342 template<class M0t, class M1t, class M2t> 1343 alias(const M0t &M0, const M1t &M1, const M2t &M2) 1344 : Option(Optional | Hidden), AliasFor(0) { 1345 apply(M0, this); apply(M1, this); apply(M2, this); 1346 done(); 1347 } 1348 // Four options... 1349 template<class M0t, class M1t, class M2t, class M3t> 1350 alias(const M0t &M0, const M1t &M1, const M2t &M2, const M3t &M3) 1351 : Option(Optional | Hidden), AliasFor(0) { 1352 apply(M0, this); apply(M1, this); apply(M2, this); apply(M3, this); 1353 done(); 1354 } 1355}; 1356 1357// aliasfor - Modifier to set the option an alias aliases. 1358struct aliasopt { 1359 Option &Opt; 1360 explicit aliasopt(Option &O) : Opt(O) {} 1361 void apply(alias &A) const { A.setAliasFor(Opt); } 1362}; 1363 1364// extrahelp - provide additional help at the end of the normal help 1365// output. All occurrences of cl::extrahelp will be accumulated and 1366// printed to std::cerr at the end of the regular help, just before 1367// exit is called. 1368struct extrahelp { 1369 const char * morehelp; 1370 explicit extrahelp(const char* help); 1371}; 1372 1373void PrintVersionMessage(); 1374// This function just prints the help message, exactly the same way as if the 1375// --help option had been given on the command line. 1376// NOTE: THIS FUNCTION TERMINATES THE PROGRAM! 1377void PrintHelpMessage(); 1378 1379} // End namespace cl 1380 1381} // End namespace llvm 1382 1383#endif 1384