1//===- llvm/Support/CommandLine.h - Command line handler --------*- C++ -*-===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8// 9// This class implements a command line argument processor that is useful when 10// creating a tool. It provides a simple, minimalistic interface that is easily 11// extensible and supports nonlocal (library) command line options. 12// 13// Note that rather than trying to figure out what this code does, you should 14// read the library documentation located in docs/CommandLine.html or looks at 15// the many example usages in tools/*/*.cpp 16// 17//===----------------------------------------------------------------------===// 18 19#ifndef LLVM_SUPPORT_COMMANDLINE_H 20#define LLVM_SUPPORT_COMMANDLINE_H 21 22#include "llvm/ADT/ArrayRef.h" 23#include "llvm/ADT/None.h" 24#include "llvm/ADT/Optional.h" 25#include "llvm/ADT/STLExtras.h" 26#include "llvm/ADT/SmallPtrSet.h" 27#include "llvm/ADT/SmallVector.h" 28#include "llvm/ADT/StringMap.h" 29#include "llvm/ADT/StringRef.h" 30#include "llvm/ADT/Twine.h" 31#include "llvm/ADT/iterator_range.h" 32#include "llvm/Support/ErrorHandling.h" 33#include "llvm/Support/ManagedStatic.h" 34#include "llvm/Support/VirtualFileSystem.h" 35#include "llvm/Support/raw_ostream.h" 36#include <cassert> 37#include <climits> 38#include <cstddef> 39#include <functional> 40#include <initializer_list> 41#include <string> 42#include <type_traits> 43#include <vector> 44 45namespace llvm { 46 47class StringSaver; 48class raw_ostream; 49 50/// cl Namespace - This namespace contains all of the command line option 51/// processing machinery. It is intentionally a short name to make qualified 52/// usage concise. 53namespace cl { 54 55//===----------------------------------------------------------------------===// 56// ParseCommandLineOptions - Command line option processing entry point. 57// 58// Returns true on success. Otherwise, this will print the error message to 59// stderr and exit if \p Errs is not set (nullptr by default), or print the 60// error message to \p Errs and return false if \p Errs is provided. 61// 62// If EnvVar is not nullptr, command-line options are also parsed from the 63// environment variable named by EnvVar. Precedence is given to occurrences 64// from argv. This precedence is currently implemented by parsing argv after 65// the environment variable, so it is only implemented correctly for options 66// that give precedence to later occurrences. If your program supports options 67// that give precedence to earlier occurrences, you will need to extend this 68// function to support it correctly. 69bool ParseCommandLineOptions(int argc, const char *const *argv, 70 StringRef Overview = "", 71 raw_ostream *Errs = nullptr, 72 const char *EnvVar = nullptr, 73 bool LongOptionsUseDoubleDash = false); 74 75//===----------------------------------------------------------------------===// 76// ParseEnvironmentOptions - Environment variable option processing alternate 77// entry point. 78// 79void ParseEnvironmentOptions(const char *progName, const char *envvar, 80 const char *Overview = ""); 81 82// Function pointer type for printing version information. 83using VersionPrinterTy = std::function<void(raw_ostream &)>; 84 85///===---------------------------------------------------------------------===// 86/// SetVersionPrinter - Override the default (LLVM specific) version printer 87/// used to print out the version when --version is given 88/// on the command line. This allows other systems using the 89/// CommandLine utilities to print their own version string. 90void SetVersionPrinter(VersionPrinterTy func); 91 92///===---------------------------------------------------------------------===// 93/// AddExtraVersionPrinter - Add an extra printer to use in addition to the 94/// default one. This can be called multiple times, 95/// and each time it adds a new function to the list 96/// which will be called after the basic LLVM version 97/// printing is complete. Each can then add additional 98/// information specific to the tool. 99void AddExtraVersionPrinter(VersionPrinterTy func); 100 101// PrintOptionValues - Print option values. 102// With -print-options print the difference between option values and defaults. 103// With -print-all-options print all option values. 104// (Currently not perfect, but best-effort.) 105void PrintOptionValues(); 106 107// Forward declaration - AddLiteralOption needs to be up here to make gcc happy. 108class Option; 109 110/// Adds a new option for parsing and provides the option it refers to. 111/// 112/// \param O pointer to the option 113/// \param Name the string name for the option to handle during parsing 114/// 115/// Literal options are used by some parsers to register special option values. 116/// This is how the PassNameParser registers pass names for opt. 117void AddLiteralOption(Option &O, StringRef Name); 118 119//===----------------------------------------------------------------------===// 120// Flags permitted to be passed to command line arguments 121// 122 123enum NumOccurrencesFlag { // Flags for the number of occurrences allowed 124 Optional = 0x00, // Zero or One occurrence 125 ZeroOrMore = 0x01, // Zero or more occurrences allowed 126 Required = 0x02, // One occurrence required 127 OneOrMore = 0x03, // One or more occurrences required 128 129 // ConsumeAfter - Indicates that this option is fed anything that follows the 130 // last positional argument required by the application (it is an error if 131 // there are zero positional arguments, and a ConsumeAfter option is used). 132 // Thus, for example, all arguments to LLI are processed until a filename is 133 // found. Once a filename is found, all of the succeeding arguments are 134 // passed, unprocessed, to the ConsumeAfter option. 135 // 136 ConsumeAfter = 0x04 137}; 138 139enum ValueExpected { // Is a value required for the option? 140 // zero reserved for the unspecified value 141 ValueOptional = 0x01, // The value can appear... or not 142 ValueRequired = 0x02, // The value is required to appear! 143 ValueDisallowed = 0x03 // A value may not be specified (for flags) 144}; 145 146enum OptionHidden { // Control whether -help shows this option 147 NotHidden = 0x00, // Option included in -help & -help-hidden 148 Hidden = 0x01, // -help doesn't, but -help-hidden does 149 ReallyHidden = 0x02 // Neither -help nor -help-hidden show this arg 150}; 151 152// Formatting flags - This controls special features that the option might have 153// that cause it to be parsed differently... 154// 155// Prefix - This option allows arguments that are otherwise unrecognized to be 156// matched by options that are a prefix of the actual value. This is useful for 157// cases like a linker, where options are typically of the form '-lfoo' or 158// '-L../../include' where -l or -L are the actual flags. When prefix is 159// enabled, and used, the value for the flag comes from the suffix of the 160// argument. 161// 162// AlwaysPrefix - Only allow the behavior enabled by the Prefix flag and reject 163// the Option=Value form. 164// 165 166enum FormattingFlags { 167 NormalFormatting = 0x00, // Nothing special 168 Positional = 0x01, // Is a positional argument, no '-' required 169 Prefix = 0x02, // Can this option directly prefix its value? 170 AlwaysPrefix = 0x03 // Can this option only directly prefix its value? 171}; 172 173enum MiscFlags { // Miscellaneous flags to adjust argument 174 CommaSeparated = 0x01, // Should this cl::list split between commas? 175 PositionalEatsArgs = 0x02, // Should this positional cl::list eat -args? 176 Sink = 0x04, // Should this cl::list eat all unknown options? 177 178 // Grouping - Can this option group with other options? 179 // If this is enabled, multiple letter options are allowed to bunch together 180 // with only a single hyphen for the whole group. This allows emulation 181 // of the behavior that ls uses for example: ls -la === ls -l -a 182 Grouping = 0x08, 183 184 // Default option 185 DefaultOption = 0x10 186}; 187 188//===----------------------------------------------------------------------===// 189// Option Category class 190// 191class OptionCategory { 192private: 193 StringRef const Name; 194 StringRef const Description; 195 196 void registerCategory(); 197 198public: 199 OptionCategory(StringRef const Name, 200 StringRef const Description = "") 201 : Name(Name), Description(Description) { 202 registerCategory(); 203 } 204 205 StringRef getName() const { return Name; } 206 StringRef getDescription() const { return Description; } 207}; 208 209// The general Option Category (used as default category). 210extern OptionCategory GeneralCategory; 211 212//===----------------------------------------------------------------------===// 213// SubCommand class 214// 215class SubCommand { 216private: 217 StringRef Name; 218 StringRef Description; 219 220protected: 221 void registerSubCommand(); 222 void unregisterSubCommand(); 223 224public: 225 SubCommand(StringRef Name, StringRef Description = "") 226 : Name(Name), Description(Description) { 227 registerSubCommand(); 228 } 229 SubCommand() = default; 230 231 void reset(); 232 233 explicit operator bool() const; 234 235 StringRef getName() const { return Name; } 236 StringRef getDescription() const { return Description; } 237 238 SmallVector<Option *, 4> PositionalOpts; 239 SmallVector<Option *, 4> SinkOpts; 240 StringMap<Option *> OptionsMap; 241 242 Option *ConsumeAfterOpt = nullptr; // The ConsumeAfter option if it exists. 243}; 244 245// A special subcommand representing no subcommand 246extern ManagedStatic<SubCommand> TopLevelSubCommand; 247 248// A special subcommand that can be used to put an option into all subcommands. 249extern ManagedStatic<SubCommand> AllSubCommands; 250 251//===----------------------------------------------------------------------===// 252// Option Base class 253// 254class Option { 255 friend class alias; 256 257 // handleOccurrences - Overriden by subclasses to handle the value passed into 258 // an argument. Should return true if there was an error processing the 259 // argument and the program should exit. 260 // 261 virtual bool handleOccurrence(unsigned pos, StringRef ArgName, 262 StringRef Arg) = 0; 263 264 virtual enum ValueExpected getValueExpectedFlagDefault() const { 265 return ValueOptional; 266 } 267 268 // Out of line virtual function to provide home for the class. 269 virtual void anchor(); 270 271 uint16_t NumOccurrences; // The number of times specified 272 // Occurrences, HiddenFlag, and Formatting are all enum types but to avoid 273 // problems with signed enums in bitfields. 274 uint16_t Occurrences : 3; // enum NumOccurrencesFlag 275 // not using the enum type for 'Value' because zero is an implementation 276 // detail representing the non-value 277 uint16_t Value : 2; 278 uint16_t HiddenFlag : 2; // enum OptionHidden 279 uint16_t Formatting : 2; // enum FormattingFlags 280 uint16_t Misc : 5; 281 uint16_t FullyInitialized : 1; // Has addArgument been called? 282 uint16_t Position; // Position of last occurrence of the option 283 uint16_t AdditionalVals; // Greater than 0 for multi-valued option. 284 285public: 286 StringRef ArgStr; // The argument string itself (ex: "help", "o") 287 StringRef HelpStr; // The descriptive text message for -help 288 StringRef ValueStr; // String describing what the value of this option is 289 SmallVector<OptionCategory *, 1> 290 Categories; // The Categories this option belongs to 291 SmallPtrSet<SubCommand *, 1> Subs; // The subcommands this option belongs to. 292 293 inline enum NumOccurrencesFlag getNumOccurrencesFlag() const { 294 return (enum NumOccurrencesFlag)Occurrences; 295 } 296 297 inline enum ValueExpected getValueExpectedFlag() const { 298 return Value ? ((enum ValueExpected)Value) : getValueExpectedFlagDefault(); 299 } 300 301 inline enum OptionHidden getOptionHiddenFlag() const { 302 return (enum OptionHidden)HiddenFlag; 303 } 304 305 inline enum FormattingFlags getFormattingFlag() const { 306 return (enum FormattingFlags)Formatting; 307 } 308 309 inline unsigned getMiscFlags() const { return Misc; } 310 inline unsigned getPosition() const { return Position; } 311 inline unsigned getNumAdditionalVals() const { return AdditionalVals; } 312 313 // hasArgStr - Return true if the argstr != "" 314 bool hasArgStr() const { return !ArgStr.empty(); } 315 bool isPositional() const { return getFormattingFlag() == cl::Positional; } 316 bool isSink() const { return getMiscFlags() & cl::Sink; } 317 bool isDefaultOption() const { return getMiscFlags() & cl::DefaultOption; } 318 319 bool isConsumeAfter() const { 320 return getNumOccurrencesFlag() == cl::ConsumeAfter; 321 } 322 323 bool isInAllSubCommands() const { 324 return any_of(Subs, [](const SubCommand *SC) { 325 return SC == &*AllSubCommands; 326 }); 327 } 328 329 //-------------------------------------------------------------------------=== 330 // Accessor functions set by OptionModifiers 331 // 332 void setArgStr(StringRef S); 333 void setDescription(StringRef S) { HelpStr = S; } 334 void setValueStr(StringRef S) { ValueStr = S; } 335 void setNumOccurrencesFlag(enum NumOccurrencesFlag Val) { Occurrences = Val; } 336 void setValueExpectedFlag(enum ValueExpected Val) { Value = Val; } 337 void setHiddenFlag(enum OptionHidden Val) { HiddenFlag = Val; } 338 void setFormattingFlag(enum FormattingFlags V) { Formatting = V; } 339 void setMiscFlag(enum MiscFlags M) { Misc |= M; } 340 void setPosition(unsigned pos) { Position = pos; } 341 void addCategory(OptionCategory &C); 342 void addSubCommand(SubCommand &S) { Subs.insert(&S); } 343 344protected: 345 explicit Option(enum NumOccurrencesFlag OccurrencesFlag, 346 enum OptionHidden Hidden) 347 : NumOccurrences(0), Occurrences(OccurrencesFlag), Value(0), 348 HiddenFlag(Hidden), Formatting(NormalFormatting), Misc(0), 349 FullyInitialized(false), Position(0), AdditionalVals(0) { 350 Categories.push_back(&GeneralCategory); 351 } 352 353 inline void setNumAdditionalVals(unsigned n) { AdditionalVals = n; } 354 355public: 356 virtual ~Option() = default; 357 358 // addArgument - Register this argument with the commandline system. 359 // 360 void addArgument(); 361 362 /// Unregisters this option from the CommandLine system. 363 /// 364 /// This option must have been the last option registered. 365 /// For testing purposes only. 366 void removeArgument(); 367 368 // Return the width of the option tag for printing... 369 virtual size_t getOptionWidth() const = 0; 370 371 // printOptionInfo - Print out information about this option. The 372 // to-be-maintained width is specified. 373 // 374 virtual void printOptionInfo(size_t GlobalWidth) const = 0; 375 376 virtual void printOptionValue(size_t GlobalWidth, bool Force) const = 0; 377 378 virtual void setDefault() = 0; 379 380 static void printHelpStr(StringRef HelpStr, size_t Indent, 381 size_t FirstLineIndentedBy); 382 383 virtual void getExtraOptionNames(SmallVectorImpl<StringRef> &) {} 384 385 // addOccurrence - Wrapper around handleOccurrence that enforces Flags. 386 // 387 virtual bool addOccurrence(unsigned pos, StringRef ArgName, StringRef Value, 388 bool MultiArg = false); 389 390 // Prints option name followed by message. Always returns true. 391 bool error(const Twine &Message, StringRef ArgName = StringRef(), raw_ostream &Errs = llvm::errs()); 392 bool error(const Twine &Message, raw_ostream &Errs) { 393 return error(Message, StringRef(), Errs); 394 } 395 396 inline int getNumOccurrences() const { return NumOccurrences; } 397 void reset(); 398}; 399 400//===----------------------------------------------------------------------===// 401// Command line option modifiers that can be used to modify the behavior of 402// command line option parsers... 403// 404 405// desc - Modifier to set the description shown in the -help output... 406struct desc { 407 StringRef Desc; 408 409 desc(StringRef Str) : Desc(Str) {} 410 411 void apply(Option &O) const { O.setDescription(Desc); } 412}; 413 414// value_desc - Modifier to set the value description shown in the -help 415// output... 416struct value_desc { 417 StringRef Desc; 418 419 value_desc(StringRef Str) : Desc(Str) {} 420 421 void apply(Option &O) const { O.setValueStr(Desc); } 422}; 423 424// init - Specify a default (initial) value for the command line argument, if 425// the default constructor for the argument type does not give you what you 426// want. This is only valid on "opt" arguments, not on "list" arguments. 427// 428template <class Ty> struct initializer { 429 const Ty &Init; 430 initializer(const Ty &Val) : Init(Val) {} 431 432 template <class Opt> void apply(Opt &O) const { O.setInitialValue(Init); } 433}; 434 435template <class Ty> initializer<Ty> init(const Ty &Val) { 436 return initializer<Ty>(Val); 437} 438 439// location - Allow the user to specify which external variable they want to 440// store the results of the command line argument processing into, if they don't 441// want to store it in the option itself. 442// 443template <class Ty> struct LocationClass { 444 Ty &Loc; 445 446 LocationClass(Ty &L) : Loc(L) {} 447 448 template <class Opt> void apply(Opt &O) const { O.setLocation(O, Loc); } 449}; 450 451template <class Ty> LocationClass<Ty> location(Ty &L) { 452 return LocationClass<Ty>(L); 453} 454 455// cat - Specifiy the Option category for the command line argument to belong 456// to. 457struct cat { 458 OptionCategory &Category; 459 460 cat(OptionCategory &c) : Category(c) {} 461 462 template <class Opt> void apply(Opt &O) const { O.addCategory(Category); } 463}; 464 465// sub - Specify the subcommand that this option belongs to. 466struct sub { 467 SubCommand ⋐ 468 469 sub(SubCommand &S) : Sub(S) {} 470 471 template <class Opt> void apply(Opt &O) const { O.addSubCommand(Sub); } 472}; 473 474// Specify a callback function to be called when an option is seen. 475// Can be used to set other options automatically. 476template <typename R, typename Ty> struct cb { 477 std::function<R(Ty)> CB; 478 479 cb(std::function<R(Ty)> CB) : CB(CB) {} 480 481 template <typename Opt> void apply(Opt &O) const { O.setCallback(CB); } 482}; 483 484namespace detail { 485template <typename F> 486struct callback_traits : public callback_traits<decltype(&F::operator())> {}; 487 488template <typename R, typename C, typename... Args> 489struct callback_traits<R (C::*)(Args...) const> { 490 using result_type = R; 491 using arg_type = typename std::tuple_element<0, std::tuple<Args...>>::type; 492 static_assert(sizeof...(Args) == 1, "callback function must have one and only one parameter"); 493 static_assert(std::is_same<result_type, void>::value, 494 "callback return type must be void"); 495 static_assert( 496 std::is_lvalue_reference<arg_type>::value && 497 std::is_const<typename std::remove_reference<arg_type>::type>::value, 498 "callback arg_type must be a const lvalue reference"); 499}; 500} // namespace detail 501 502template <typename F> 503cb<typename detail::callback_traits<F>::result_type, 504 typename detail::callback_traits<F>::arg_type> 505callback(F CB) { 506 using result_type = typename detail::callback_traits<F>::result_type; 507 using arg_type = typename detail::callback_traits<F>::arg_type; 508 return cb<result_type, arg_type>(CB); 509} 510 511//===----------------------------------------------------------------------===// 512// OptionValue class 513 514// Support value comparison outside the template. 515struct GenericOptionValue { 516 virtual bool compare(const GenericOptionValue &V) const = 0; 517 518protected: 519 GenericOptionValue() = default; 520 GenericOptionValue(const GenericOptionValue&) = default; 521 GenericOptionValue &operator=(const GenericOptionValue &) = default; 522 ~GenericOptionValue() = default; 523 524private: 525 virtual void anchor(); 526}; 527 528template <class DataType> struct OptionValue; 529 530// The default value safely does nothing. Option value printing is only 531// best-effort. 532template <class DataType, bool isClass> 533struct OptionValueBase : public GenericOptionValue { 534 // Temporary storage for argument passing. 535 using WrapperType = OptionValue<DataType>; 536 537 bool hasValue() const { return false; } 538 539 const DataType &getValue() const { llvm_unreachable("no default value"); } 540 541 // Some options may take their value from a different data type. 542 template <class DT> void setValue(const DT & /*V*/) {} 543 544 bool compare(const DataType & /*V*/) const { return false; } 545 546 bool compare(const GenericOptionValue & /*V*/) const override { 547 return false; 548 } 549 550protected: 551 ~OptionValueBase() = default; 552}; 553 554// Simple copy of the option value. 555template <class DataType> class OptionValueCopy : public GenericOptionValue { 556 DataType Value; 557 bool Valid = false; 558 559protected: 560 OptionValueCopy(const OptionValueCopy&) = default; 561 OptionValueCopy &operator=(const OptionValueCopy &) = default; 562 ~OptionValueCopy() = default; 563 564public: 565 OptionValueCopy() = default; 566 567 bool hasValue() const { return Valid; } 568 569 const DataType &getValue() const { 570 assert(Valid && "invalid option value"); 571 return Value; 572 } 573 574 void setValue(const DataType &V) { 575 Valid = true; 576 Value = V; 577 } 578 579 bool compare(const DataType &V) const { return Valid && (Value != V); } 580 581 bool compare(const GenericOptionValue &V) const override { 582 const OptionValueCopy<DataType> &VC = 583 static_cast<const OptionValueCopy<DataType> &>(V); 584 if (!VC.hasValue()) 585 return false; 586 return compare(VC.getValue()); 587 } 588}; 589 590// Non-class option values. 591template <class DataType> 592struct OptionValueBase<DataType, false> : OptionValueCopy<DataType> { 593 using WrapperType = DataType; 594 595protected: 596 OptionValueBase() = default; 597 OptionValueBase(const OptionValueBase&) = default; 598 OptionValueBase &operator=(const OptionValueBase &) = default; 599 ~OptionValueBase() = default; 600}; 601 602// Top-level option class. 603template <class DataType> 604struct OptionValue final 605 : OptionValueBase<DataType, std::is_class<DataType>::value> { 606 OptionValue() = default; 607 608 OptionValue(const DataType &V) { this->setValue(V); } 609 610 // Some options may take their value from a different data type. 611 template <class DT> OptionValue<DataType> &operator=(const DT &V) { 612 this->setValue(V); 613 return *this; 614 } 615}; 616 617// Other safe-to-copy-by-value common option types. 618enum boolOrDefault { BOU_UNSET, BOU_TRUE, BOU_FALSE }; 619template <> 620struct OptionValue<cl::boolOrDefault> final 621 : OptionValueCopy<cl::boolOrDefault> { 622 using WrapperType = cl::boolOrDefault; 623 624 OptionValue() = default; 625 626 OptionValue(const cl::boolOrDefault &V) { this->setValue(V); } 627 628 OptionValue<cl::boolOrDefault> &operator=(const cl::boolOrDefault &V) { 629 setValue(V); 630 return *this; 631 } 632 633private: 634 void anchor() override; 635}; 636 637template <> 638struct OptionValue<std::string> final : OptionValueCopy<std::string> { 639 using WrapperType = StringRef; 640 641 OptionValue() = default; 642 643 OptionValue(const std::string &V) { this->setValue(V); } 644 645 OptionValue<std::string> &operator=(const std::string &V) { 646 setValue(V); 647 return *this; 648 } 649 650private: 651 void anchor() override; 652}; 653 654//===----------------------------------------------------------------------===// 655// Enum valued command line option 656// 657 658// This represents a single enum value, using "int" as the underlying type. 659struct OptionEnumValue { 660 StringRef Name; 661 int Value; 662 StringRef Description; 663}; 664 665#define clEnumVal(ENUMVAL, DESC) \ 666 llvm::cl::OptionEnumValue { #ENUMVAL, int(ENUMVAL), DESC } 667#define clEnumValN(ENUMVAL, FLAGNAME, DESC) \ 668 llvm::cl::OptionEnumValue { FLAGNAME, int(ENUMVAL), DESC } 669 670// values - For custom data types, allow specifying a group of values together 671// as the values that go into the mapping that the option handler uses. 672// 673class ValuesClass { 674 // Use a vector instead of a map, because the lists should be short, 675 // the overhead is less, and most importantly, it keeps them in the order 676 // inserted so we can print our option out nicely. 677 SmallVector<OptionEnumValue, 4> Values; 678 679public: 680 ValuesClass(std::initializer_list<OptionEnumValue> Options) 681 : Values(Options) {} 682 683 template <class Opt> void apply(Opt &O) const { 684 for (auto Value : Values) 685 O.getParser().addLiteralOption(Value.Name, Value.Value, 686 Value.Description); 687 } 688}; 689 690/// Helper to build a ValuesClass by forwarding a variable number of arguments 691/// as an initializer list to the ValuesClass constructor. 692template <typename... OptsTy> ValuesClass values(OptsTy... Options) { 693 return ValuesClass({Options...}); 694} 695 696//===----------------------------------------------------------------------===// 697// parser class - Parameterizable parser for different data types. By default, 698// known data types (string, int, bool) have specialized parsers, that do what 699// you would expect. The default parser, used for data types that are not 700// built-in, uses a mapping table to map specific options to values, which is 701// used, among other things, to handle enum types. 702 703//-------------------------------------------------- 704// generic_parser_base - This class holds all the non-generic code that we do 705// not need replicated for every instance of the generic parser. This also 706// allows us to put stuff into CommandLine.cpp 707// 708class generic_parser_base { 709protected: 710 class GenericOptionInfo { 711 public: 712 GenericOptionInfo(StringRef name, StringRef helpStr) 713 : Name(name), HelpStr(helpStr) {} 714 StringRef Name; 715 StringRef HelpStr; 716 }; 717 718public: 719 generic_parser_base(Option &O) : Owner(O) {} 720 721 virtual ~generic_parser_base() = default; 722 // Base class should have virtual-destructor 723 724 // getNumOptions - Virtual function implemented by generic subclass to 725 // indicate how many entries are in Values. 726 // 727 virtual unsigned getNumOptions() const = 0; 728 729 // getOption - Return option name N. 730 virtual StringRef getOption(unsigned N) const = 0; 731 732 // getDescription - Return description N 733 virtual StringRef getDescription(unsigned N) const = 0; 734 735 // Return the width of the option tag for printing... 736 virtual size_t getOptionWidth(const Option &O) const; 737 738 virtual const GenericOptionValue &getOptionValue(unsigned N) const = 0; 739 740 // printOptionInfo - Print out information about this option. The 741 // to-be-maintained width is specified. 742 // 743 virtual void printOptionInfo(const Option &O, size_t GlobalWidth) const; 744 745 void printGenericOptionDiff(const Option &O, const GenericOptionValue &V, 746 const GenericOptionValue &Default, 747 size_t GlobalWidth) const; 748 749 // printOptionDiff - print the value of an option and it's default. 750 // 751 // Template definition ensures that the option and default have the same 752 // DataType (via the same AnyOptionValue). 753 template <class AnyOptionValue> 754 void printOptionDiff(const Option &O, const AnyOptionValue &V, 755 const AnyOptionValue &Default, 756 size_t GlobalWidth) const { 757 printGenericOptionDiff(O, V, Default, GlobalWidth); 758 } 759 760 void initialize() {} 761 762 void getExtraOptionNames(SmallVectorImpl<StringRef> &OptionNames) { 763 // If there has been no argstr specified, that means that we need to add an 764 // argument for every possible option. This ensures that our options are 765 // vectored to us. 766 if (!Owner.hasArgStr()) 767 for (unsigned i = 0, e = getNumOptions(); i != e; ++i) 768 OptionNames.push_back(getOption(i)); 769 } 770 771 enum ValueExpected getValueExpectedFlagDefault() const { 772 // If there is an ArgStr specified, then we are of the form: 773 // 774 // -opt=O2 or -opt O2 or -optO2 775 // 776 // In which case, the value is required. Otherwise if an arg str has not 777 // been specified, we are of the form: 778 // 779 // -O2 or O2 or -la (where -l and -a are separate options) 780 // 781 // If this is the case, we cannot allow a value. 782 // 783 if (Owner.hasArgStr()) 784 return ValueRequired; 785 else 786 return ValueDisallowed; 787 } 788 789 // findOption - Return the option number corresponding to the specified 790 // argument string. If the option is not found, getNumOptions() is returned. 791 // 792 unsigned findOption(StringRef Name); 793 794protected: 795 Option &Owner; 796}; 797 798// Default parser implementation - This implementation depends on having a 799// mapping of recognized options to values of some sort. In addition to this, 800// each entry in the mapping also tracks a help message that is printed with the 801// command line option for -help. Because this is a simple mapping parser, the 802// data type can be any unsupported type. 803// 804template <class DataType> class parser : public generic_parser_base { 805protected: 806 class OptionInfo : public GenericOptionInfo { 807 public: 808 OptionInfo(StringRef name, DataType v, StringRef helpStr) 809 : GenericOptionInfo(name, helpStr), V(v) {} 810 811 OptionValue<DataType> V; 812 }; 813 SmallVector<OptionInfo, 8> Values; 814 815public: 816 parser(Option &O) : generic_parser_base(O) {} 817 818 using parser_data_type = DataType; 819 820 // Implement virtual functions needed by generic_parser_base 821 unsigned getNumOptions() const override { return unsigned(Values.size()); } 822 StringRef getOption(unsigned N) const override { return Values[N].Name; } 823 StringRef getDescription(unsigned N) const override { 824 return Values[N].HelpStr; 825 } 826 827 // getOptionValue - Return the value of option name N. 828 const GenericOptionValue &getOptionValue(unsigned N) const override { 829 return Values[N].V; 830 } 831 832 // parse - Return true on error. 833 bool parse(Option &O, StringRef ArgName, StringRef Arg, DataType &V) { 834 StringRef ArgVal; 835 if (Owner.hasArgStr()) 836 ArgVal = Arg; 837 else 838 ArgVal = ArgName; 839 840 for (size_t i = 0, e = Values.size(); i != e; ++i) 841 if (Values[i].Name == ArgVal) { 842 V = Values[i].V.getValue(); 843 return false; 844 } 845 846 return O.error("Cannot find option named '" + ArgVal + "'!"); 847 } 848 849 /// addLiteralOption - Add an entry to the mapping table. 850 /// 851 template <class DT> 852 void addLiteralOption(StringRef Name, const DT &V, StringRef HelpStr) { 853 assert(findOption(Name) == Values.size() && "Option already exists!"); 854 OptionInfo X(Name, static_cast<DataType>(V), HelpStr); 855 Values.push_back(X); 856 AddLiteralOption(Owner, Name); 857 } 858 859 /// removeLiteralOption - Remove the specified option. 860 /// 861 void removeLiteralOption(StringRef Name) { 862 unsigned N = findOption(Name); 863 assert(N != Values.size() && "Option not found!"); 864 Values.erase(Values.begin() + N); 865 } 866}; 867 868//-------------------------------------------------- 869// basic_parser - Super class of parsers to provide boilerplate code 870// 871class basic_parser_impl { // non-template implementation of basic_parser<t> 872public: 873 basic_parser_impl(Option &) {} 874 875 virtual ~basic_parser_impl() {} 876 877 enum ValueExpected getValueExpectedFlagDefault() const { 878 return ValueRequired; 879 } 880 881 void getExtraOptionNames(SmallVectorImpl<StringRef> &) {} 882 883 void initialize() {} 884 885 // Return the width of the option tag for printing... 886 size_t getOptionWidth(const Option &O) const; 887 888 // printOptionInfo - Print out information about this option. The 889 // to-be-maintained width is specified. 890 // 891 void printOptionInfo(const Option &O, size_t GlobalWidth) const; 892 893 // printOptionNoValue - Print a placeholder for options that don't yet support 894 // printOptionDiff(). 895 void printOptionNoValue(const Option &O, size_t GlobalWidth) const; 896 897 // getValueName - Overload in subclass to provide a better default value. 898 virtual StringRef getValueName() const { return "value"; } 899 900 // An out-of-line virtual method to provide a 'home' for this class. 901 virtual void anchor(); 902 903protected: 904 // A helper for basic_parser::printOptionDiff. 905 void printOptionName(const Option &O, size_t GlobalWidth) const; 906}; 907 908// basic_parser - The real basic parser is just a template wrapper that provides 909// a typedef for the provided data type. 910// 911template <class DataType> class basic_parser : public basic_parser_impl { 912public: 913 using parser_data_type = DataType; 914 using OptVal = OptionValue<DataType>; 915 916 basic_parser(Option &O) : basic_parser_impl(O) {} 917}; 918 919//-------------------------------------------------- 920// parser<bool> 921// 922template <> class parser<bool> : public basic_parser<bool> { 923public: 924 parser(Option &O) : basic_parser(O) {} 925 926 // parse - Return true on error. 927 bool parse(Option &O, StringRef ArgName, StringRef Arg, bool &Val); 928 929 void initialize() {} 930 931 enum ValueExpected getValueExpectedFlagDefault() const { 932 return ValueOptional; 933 } 934 935 // getValueName - Do not print =<value> at all. 936 StringRef getValueName() const override { return StringRef(); } 937 938 void printOptionDiff(const Option &O, bool V, OptVal Default, 939 size_t GlobalWidth) const; 940 941 // An out-of-line virtual method to provide a 'home' for this class. 942 void anchor() override; 943}; 944 945extern template class basic_parser<bool>; 946 947//-------------------------------------------------- 948// parser<boolOrDefault> 949template <> class parser<boolOrDefault> : public basic_parser<boolOrDefault> { 950public: 951 parser(Option &O) : basic_parser(O) {} 952 953 // parse - Return true on error. 954 bool parse(Option &O, StringRef ArgName, StringRef Arg, boolOrDefault &Val); 955 956 enum ValueExpected getValueExpectedFlagDefault() const { 957 return ValueOptional; 958 } 959 960 // getValueName - Do not print =<value> at all. 961 StringRef getValueName() const override { return StringRef(); } 962 963 void printOptionDiff(const Option &O, boolOrDefault V, OptVal Default, 964 size_t GlobalWidth) const; 965 966 // An out-of-line virtual method to provide a 'home' for this class. 967 void anchor() override; 968}; 969 970extern template class basic_parser<boolOrDefault>; 971 972//-------------------------------------------------- 973// parser<int> 974// 975template <> class parser<int> : public basic_parser<int> { 976public: 977 parser(Option &O) : basic_parser(O) {} 978 979 // parse - Return true on error. 980 bool parse(Option &O, StringRef ArgName, StringRef Arg, int &Val); 981 982 // getValueName - Overload in subclass to provide a better default value. 983 StringRef getValueName() const override { return "int"; } 984 985 void printOptionDiff(const Option &O, int V, OptVal Default, 986 size_t GlobalWidth) const; 987 988 // An out-of-line virtual method to provide a 'home' for this class. 989 void anchor() override; 990}; 991 992extern template class basic_parser<int>; 993 994//-------------------------------------------------- 995// parser<long> 996// 997template <> class parser<long> final : public basic_parser<long> { 998public: 999 parser(Option &O) : basic_parser(O) {} 1000 1001 // parse - Return true on error. 1002 bool parse(Option &O, StringRef ArgName, StringRef Arg, long &Val); 1003 1004 // getValueName - Overload in subclass to provide a better default value. 1005 StringRef getValueName() const override { return "long"; } 1006 1007 void printOptionDiff(const Option &O, long V, OptVal Default, 1008 size_t GlobalWidth) const; 1009 1010 // An out-of-line virtual method to provide a 'home' for this class. 1011 void anchor() override; 1012}; 1013 1014extern template class basic_parser<long>; 1015 1016//-------------------------------------------------- 1017// parser<long long> 1018// 1019template <> class parser<long long> : public basic_parser<long long> { 1020public: 1021 parser(Option &O) : basic_parser(O) {} 1022 1023 // parse - Return true on error. 1024 bool parse(Option &O, StringRef ArgName, StringRef Arg, long long &Val); 1025 1026 // getValueName - Overload in subclass to provide a better default value. 1027 StringRef getValueName() const override { return "long"; } 1028 1029 void printOptionDiff(const Option &O, long long V, OptVal Default, 1030 size_t GlobalWidth) const; 1031 1032 // An out-of-line virtual method to provide a 'home' for this class. 1033 void anchor() override; 1034}; 1035 1036extern template class basic_parser<long long>; 1037 1038//-------------------------------------------------- 1039// parser<unsigned> 1040// 1041template <> class parser<unsigned> : public basic_parser<unsigned> { 1042public: 1043 parser(Option &O) : basic_parser(O) {} 1044 1045 // parse - Return true on error. 1046 bool parse(Option &O, StringRef ArgName, StringRef Arg, unsigned &Val); 1047 1048 // getValueName - Overload in subclass to provide a better default value. 1049 StringRef getValueName() const override { return "uint"; } 1050 1051 void printOptionDiff(const Option &O, unsigned V, OptVal Default, 1052 size_t GlobalWidth) const; 1053 1054 // An out-of-line virtual method to provide a 'home' for this class. 1055 void anchor() override; 1056}; 1057 1058extern template class basic_parser<unsigned>; 1059 1060//-------------------------------------------------- 1061// parser<unsigned long> 1062// 1063template <> 1064class parser<unsigned long> final : public basic_parser<unsigned long> { 1065public: 1066 parser(Option &O) : basic_parser(O) {} 1067 1068 // parse - Return true on error. 1069 bool parse(Option &O, StringRef ArgName, StringRef Arg, unsigned long &Val); 1070 1071 // getValueName - Overload in subclass to provide a better default value. 1072 StringRef getValueName() const override { return "ulong"; } 1073 1074 void printOptionDiff(const Option &O, unsigned long V, OptVal Default, 1075 size_t GlobalWidth) const; 1076 1077 // An out-of-line virtual method to provide a 'home' for this class. 1078 void anchor() override; 1079}; 1080 1081extern template class basic_parser<unsigned long>; 1082 1083//-------------------------------------------------- 1084// parser<unsigned long long> 1085// 1086template <> 1087class parser<unsigned long long> : public basic_parser<unsigned long long> { 1088public: 1089 parser(Option &O) : basic_parser(O) {} 1090 1091 // parse - Return true on error. 1092 bool parse(Option &O, StringRef ArgName, StringRef Arg, 1093 unsigned long long &Val); 1094 1095 // getValueName - Overload in subclass to provide a better default value. 1096 StringRef getValueName() const override { return "ulong"; } 1097 1098 void printOptionDiff(const Option &O, unsigned long long V, OptVal Default, 1099 size_t GlobalWidth) const; 1100 1101 // An out-of-line virtual method to provide a 'home' for this class. 1102 void anchor() override; 1103}; 1104 1105extern template class basic_parser<unsigned long long>; 1106 1107//-------------------------------------------------- 1108// parser<double> 1109// 1110template <> class parser<double> : public basic_parser<double> { 1111public: 1112 parser(Option &O) : basic_parser(O) {} 1113 1114 // parse - Return true on error. 1115 bool parse(Option &O, StringRef ArgName, StringRef Arg, double &Val); 1116 1117 // getValueName - Overload in subclass to provide a better default value. 1118 StringRef getValueName() const override { return "number"; } 1119 1120 void printOptionDiff(const Option &O, double V, OptVal Default, 1121 size_t GlobalWidth) const; 1122 1123 // An out-of-line virtual method to provide a 'home' for this class. 1124 void anchor() override; 1125}; 1126 1127extern template class basic_parser<double>; 1128 1129//-------------------------------------------------- 1130// parser<float> 1131// 1132template <> class parser<float> : public basic_parser<float> { 1133public: 1134 parser(Option &O) : basic_parser(O) {} 1135 1136 // parse - Return true on error. 1137 bool parse(Option &O, StringRef ArgName, StringRef Arg, float &Val); 1138 1139 // getValueName - Overload in subclass to provide a better default value. 1140 StringRef getValueName() const override { return "number"; } 1141 1142 void printOptionDiff(const Option &O, float V, OptVal Default, 1143 size_t GlobalWidth) const; 1144 1145 // An out-of-line virtual method to provide a 'home' for this class. 1146 void anchor() override; 1147}; 1148 1149extern template class basic_parser<float>; 1150 1151//-------------------------------------------------- 1152// parser<std::string> 1153// 1154template <> class parser<std::string> : public basic_parser<std::string> { 1155public: 1156 parser(Option &O) : basic_parser(O) {} 1157 1158 // parse - Return true on error. 1159 bool parse(Option &, StringRef, StringRef Arg, std::string &Value) { 1160 Value = Arg.str(); 1161 return false; 1162 } 1163 1164 // getValueName - Overload in subclass to provide a better default value. 1165 StringRef getValueName() const override { return "string"; } 1166 1167 void printOptionDiff(const Option &O, StringRef V, const OptVal &Default, 1168 size_t GlobalWidth) const; 1169 1170 // An out-of-line virtual method to provide a 'home' for this class. 1171 void anchor() override; 1172}; 1173 1174extern template class basic_parser<std::string>; 1175 1176//-------------------------------------------------- 1177// parser<char> 1178// 1179template <> class parser<char> : public basic_parser<char> { 1180public: 1181 parser(Option &O) : basic_parser(O) {} 1182 1183 // parse - Return true on error. 1184 bool parse(Option &, StringRef, StringRef Arg, char &Value) { 1185 Value = Arg[0]; 1186 return false; 1187 } 1188 1189 // getValueName - Overload in subclass to provide a better default value. 1190 StringRef getValueName() const override { return "char"; } 1191 1192 void printOptionDiff(const Option &O, char V, OptVal Default, 1193 size_t GlobalWidth) const; 1194 1195 // An out-of-line virtual method to provide a 'home' for this class. 1196 void anchor() override; 1197}; 1198 1199extern template class basic_parser<char>; 1200 1201//-------------------------------------------------- 1202// PrintOptionDiff 1203// 1204// This collection of wrappers is the intermediary between class opt and class 1205// parser to handle all the template nastiness. 1206 1207// This overloaded function is selected by the generic parser. 1208template <class ParserClass, class DT> 1209void printOptionDiff(const Option &O, const generic_parser_base &P, const DT &V, 1210 const OptionValue<DT> &Default, size_t GlobalWidth) { 1211 OptionValue<DT> OV = V; 1212 P.printOptionDiff(O, OV, Default, GlobalWidth); 1213} 1214 1215// This is instantiated for basic parsers when the parsed value has a different 1216// type than the option value. e.g. HelpPrinter. 1217template <class ParserDT, class ValDT> struct OptionDiffPrinter { 1218 void print(const Option &O, const parser<ParserDT> &P, const ValDT & /*V*/, 1219 const OptionValue<ValDT> & /*Default*/, size_t GlobalWidth) { 1220 P.printOptionNoValue(O, GlobalWidth); 1221 } 1222}; 1223 1224// This is instantiated for basic parsers when the parsed value has the same 1225// type as the option value. 1226template <class DT> struct OptionDiffPrinter<DT, DT> { 1227 void print(const Option &O, const parser<DT> &P, const DT &V, 1228 const OptionValue<DT> &Default, size_t GlobalWidth) { 1229 P.printOptionDiff(O, V, Default, GlobalWidth); 1230 } 1231}; 1232 1233// This overloaded function is selected by the basic parser, which may parse a 1234// different type than the option type. 1235template <class ParserClass, class ValDT> 1236void printOptionDiff( 1237 const Option &O, 1238 const basic_parser<typename ParserClass::parser_data_type> &P, 1239 const ValDT &V, const OptionValue<ValDT> &Default, size_t GlobalWidth) { 1240 1241 OptionDiffPrinter<typename ParserClass::parser_data_type, ValDT> printer; 1242 printer.print(O, static_cast<const ParserClass &>(P), V, Default, 1243 GlobalWidth); 1244} 1245 1246//===----------------------------------------------------------------------===// 1247// applicator class - This class is used because we must use partial 1248// specialization to handle literal string arguments specially (const char* does 1249// not correctly respond to the apply method). Because the syntax to use this 1250// is a pain, we have the 'apply' method below to handle the nastiness... 1251// 1252template <class Mod> struct applicator { 1253 template <class Opt> static void opt(const Mod &M, Opt &O) { M.apply(O); } 1254}; 1255 1256// Handle const char* as a special case... 1257template <unsigned n> struct applicator<char[n]> { 1258 template <class Opt> static void opt(StringRef Str, Opt &O) { 1259 O.setArgStr(Str); 1260 } 1261}; 1262template <unsigned n> struct applicator<const char[n]> { 1263 template <class Opt> static void opt(StringRef Str, Opt &O) { 1264 O.setArgStr(Str); 1265 } 1266}; 1267template <> struct applicator<StringRef > { 1268 template <class Opt> static void opt(StringRef Str, Opt &O) { 1269 O.setArgStr(Str); 1270 } 1271}; 1272 1273template <> struct applicator<NumOccurrencesFlag> { 1274 static void opt(NumOccurrencesFlag N, Option &O) { 1275 O.setNumOccurrencesFlag(N); 1276 } 1277}; 1278 1279template <> struct applicator<ValueExpected> { 1280 static void opt(ValueExpected VE, Option &O) { O.setValueExpectedFlag(VE); } 1281}; 1282 1283template <> struct applicator<OptionHidden> { 1284 static void opt(OptionHidden OH, Option &O) { O.setHiddenFlag(OH); } 1285}; 1286 1287template <> struct applicator<FormattingFlags> { 1288 static void opt(FormattingFlags FF, Option &O) { O.setFormattingFlag(FF); } 1289}; 1290 1291template <> struct applicator<MiscFlags> { 1292 static void opt(MiscFlags MF, Option &O) { 1293 assert((MF != Grouping || O.ArgStr.size() == 1) && 1294 "cl::Grouping can only apply to single charater Options."); 1295 O.setMiscFlag(MF); 1296 } 1297}; 1298 1299// apply method - Apply modifiers to an option in a type safe way. 1300template <class Opt, class Mod, class... Mods> 1301void apply(Opt *O, const Mod &M, const Mods &... Ms) { 1302 applicator<Mod>::opt(M, *O); 1303 apply(O, Ms...); 1304} 1305 1306template <class Opt, class Mod> void apply(Opt *O, const Mod &M) { 1307 applicator<Mod>::opt(M, *O); 1308} 1309 1310//===----------------------------------------------------------------------===// 1311// opt_storage class 1312 1313// Default storage class definition: external storage. This implementation 1314// assumes the user will specify a variable to store the data into with the 1315// cl::location(x) modifier. 1316// 1317template <class DataType, bool ExternalStorage, bool isClass> 1318class opt_storage { 1319 DataType *Location = nullptr; // Where to store the object... 1320 OptionValue<DataType> Default; 1321 1322 void check_location() const { 1323 assert(Location && "cl::location(...) not specified for a command " 1324 "line option with external storage, " 1325 "or cl::init specified before cl::location()!!"); 1326 } 1327 1328public: 1329 opt_storage() = default; 1330 1331 bool setLocation(Option &O, DataType &L) { 1332 if (Location) 1333 return O.error("cl::location(x) specified more than once!"); 1334 Location = &L; 1335 Default = L; 1336 return false; 1337 } 1338 1339 template <class T> void setValue(const T &V, bool initial = false) { 1340 check_location(); 1341 *Location = V; 1342 if (initial) 1343 Default = V; 1344 } 1345 1346 DataType &getValue() { 1347 check_location(); 1348 return *Location; 1349 } 1350 const DataType &getValue() const { 1351 check_location(); 1352 return *Location; 1353 } 1354 1355 operator DataType() const { return this->getValue(); } 1356 1357 const OptionValue<DataType> &getDefault() const { return Default; } 1358}; 1359 1360// Define how to hold a class type object, such as a string. Since we can 1361// inherit from a class, we do so. This makes us exactly compatible with the 1362// object in all cases that it is used. 1363// 1364template <class DataType> 1365class opt_storage<DataType, false, true> : public DataType { 1366public: 1367 OptionValue<DataType> Default; 1368 1369 template <class T> void setValue(const T &V, bool initial = false) { 1370 DataType::operator=(V); 1371 if (initial) 1372 Default = V; 1373 } 1374 1375 DataType &getValue() { return *this; } 1376 const DataType &getValue() const { return *this; } 1377 1378 const OptionValue<DataType> &getDefault() const { return Default; } 1379}; 1380 1381// Define a partial specialization to handle things we cannot inherit from. In 1382// this case, we store an instance through containment, and overload operators 1383// to get at the value. 1384// 1385template <class DataType> class opt_storage<DataType, false, false> { 1386public: 1387 DataType Value; 1388 OptionValue<DataType> Default; 1389 1390 // Make sure we initialize the value with the default constructor for the 1391 // type. 1392 opt_storage() : Value(DataType()), Default(DataType()) {} 1393 1394 template <class T> void setValue(const T &V, bool initial = false) { 1395 Value = V; 1396 if (initial) 1397 Default = V; 1398 } 1399 DataType &getValue() { return Value; } 1400 DataType getValue() const { return Value; } 1401 1402 const OptionValue<DataType> &getDefault() const { return Default; } 1403 1404 operator DataType() const { return getValue(); } 1405 1406 // If the datatype is a pointer, support -> on it. 1407 DataType operator->() const { return Value; } 1408}; 1409 1410//===----------------------------------------------------------------------===// 1411// opt - A scalar command line option. 1412// 1413template <class DataType, bool ExternalStorage = false, 1414 class ParserClass = parser<DataType>> 1415class opt : public Option, 1416 public opt_storage<DataType, ExternalStorage, 1417 std::is_class<DataType>::value> { 1418 ParserClass Parser; 1419 1420 bool handleOccurrence(unsigned pos, StringRef ArgName, 1421 StringRef Arg) override { 1422 typename ParserClass::parser_data_type Val = 1423 typename ParserClass::parser_data_type(); 1424 if (Parser.parse(*this, ArgName, Arg, Val)) 1425 return true; // Parse error! 1426 this->setValue(Val); 1427 this->setPosition(pos); 1428 Callback(Val); 1429 return false; 1430 } 1431 1432 enum ValueExpected getValueExpectedFlagDefault() const override { 1433 return Parser.getValueExpectedFlagDefault(); 1434 } 1435 1436 void getExtraOptionNames(SmallVectorImpl<StringRef> &OptionNames) override { 1437 return Parser.getExtraOptionNames(OptionNames); 1438 } 1439 1440 // Forward printing stuff to the parser... 1441 size_t getOptionWidth() const override { 1442 return Parser.getOptionWidth(*this); 1443 } 1444 1445 void printOptionInfo(size_t GlobalWidth) const override { 1446 Parser.printOptionInfo(*this, GlobalWidth); 1447 } 1448 1449 void printOptionValue(size_t GlobalWidth, bool Force) const override { 1450 if (Force || this->getDefault().compare(this->getValue())) { 1451 cl::printOptionDiff<ParserClass>(*this, Parser, this->getValue(), 1452 this->getDefault(), GlobalWidth); 1453 } 1454 } 1455 1456 template <class T, class = typename std::enable_if< 1457 std::is_assignable<T&, T>::value>::type> 1458 void setDefaultImpl() { 1459 const OptionValue<DataType> &V = this->getDefault(); 1460 if (V.hasValue()) 1461 this->setValue(V.getValue()); 1462 } 1463 1464 template <class T, class = typename std::enable_if< 1465 !std::is_assignable<T&, T>::value>::type> 1466 void setDefaultImpl(...) {} 1467 1468 void setDefault() override { setDefaultImpl<DataType>(); } 1469 1470 void done() { 1471 addArgument(); 1472 Parser.initialize(); 1473 } 1474 1475public: 1476 // Command line options should not be copyable 1477 opt(const opt &) = delete; 1478 opt &operator=(const opt &) = delete; 1479 1480 // setInitialValue - Used by the cl::init modifier... 1481 void setInitialValue(const DataType &V) { this->setValue(V, true); } 1482 1483 ParserClass &getParser() { return Parser; } 1484 1485 template <class T> DataType &operator=(const T &Val) { 1486 this->setValue(Val); 1487 Callback(Val); 1488 return this->getValue(); 1489 } 1490 1491 template <class... Mods> 1492 explicit opt(const Mods &... Ms) 1493 : Option(Optional, NotHidden), Parser(*this) { 1494 apply(this, Ms...); 1495 done(); 1496 } 1497 1498 void setCallback( 1499 std::function<void(const typename ParserClass::parser_data_type &)> CB) { 1500 Callback = CB; 1501 } 1502 1503 std::function<void(const typename ParserClass::parser_data_type &)> Callback = 1504 [](const typename ParserClass::parser_data_type &) {}; 1505}; 1506 1507extern template class opt<unsigned>; 1508extern template class opt<int>; 1509extern template class opt<std::string>; 1510extern template class opt<char>; 1511extern template class opt<bool>; 1512 1513//===----------------------------------------------------------------------===// 1514// list_storage class 1515 1516// Default storage class definition: external storage. This implementation 1517// assumes the user will specify a variable to store the data into with the 1518// cl::location(x) modifier. 1519// 1520template <class DataType, class StorageClass> class list_storage { 1521 StorageClass *Location = nullptr; // Where to store the object... 1522 1523public: 1524 list_storage() = default; 1525 1526 void clear() {} 1527 1528 bool setLocation(Option &O, StorageClass &L) { 1529 if (Location) 1530 return O.error("cl::location(x) specified more than once!"); 1531 Location = &L; 1532 return false; 1533 } 1534 1535 template <class T> void addValue(const T &V) { 1536 assert(Location != 0 && "cl::location(...) not specified for a command " 1537 "line option with external storage!"); 1538 Location->push_back(V); 1539 } 1540}; 1541 1542// Define how to hold a class type object, such as a string. 1543// Originally this code inherited from std::vector. In transitioning to a new 1544// API for command line options we should change this. The new implementation 1545// of this list_storage specialization implements the minimum subset of the 1546// std::vector API required for all the current clients. 1547// 1548// FIXME: Reduce this API to a more narrow subset of std::vector 1549// 1550template <class DataType> class list_storage<DataType, bool> { 1551 std::vector<DataType> Storage; 1552 1553public: 1554 using iterator = typename std::vector<DataType>::iterator; 1555 1556 iterator begin() { return Storage.begin(); } 1557 iterator end() { return Storage.end(); } 1558 1559 using const_iterator = typename std::vector<DataType>::const_iterator; 1560 1561 const_iterator begin() const { return Storage.begin(); } 1562 const_iterator end() const { return Storage.end(); } 1563 1564 using size_type = typename std::vector<DataType>::size_type; 1565 1566 size_type size() const { return Storage.size(); } 1567 1568 bool empty() const { return Storage.empty(); } 1569 1570 void push_back(const DataType &value) { Storage.push_back(value); } 1571 void push_back(DataType &&value) { Storage.push_back(value); } 1572 1573 using reference = typename std::vector<DataType>::reference; 1574 using const_reference = typename std::vector<DataType>::const_reference; 1575 1576 reference operator[](size_type pos) { return Storage[pos]; } 1577 const_reference operator[](size_type pos) const { return Storage[pos]; } 1578 1579 void clear() { 1580 Storage.clear(); 1581 } 1582 1583 iterator erase(const_iterator pos) { return Storage.erase(pos); } 1584 iterator erase(const_iterator first, const_iterator last) { 1585 return Storage.erase(first, last); 1586 } 1587 1588 iterator erase(iterator pos) { return Storage.erase(pos); } 1589 iterator erase(iterator first, iterator last) { 1590 return Storage.erase(first, last); 1591 } 1592 1593 iterator insert(const_iterator pos, const DataType &value) { 1594 return Storage.insert(pos, value); 1595 } 1596 iterator insert(const_iterator pos, DataType &&value) { 1597 return Storage.insert(pos, value); 1598 } 1599 1600 iterator insert(iterator pos, const DataType &value) { 1601 return Storage.insert(pos, value); 1602 } 1603 iterator insert(iterator pos, DataType &&value) { 1604 return Storage.insert(pos, value); 1605 } 1606 1607 reference front() { return Storage.front(); } 1608 const_reference front() const { return Storage.front(); } 1609 1610 operator std::vector<DataType>&() { return Storage; } 1611 operator ArrayRef<DataType>() { return Storage; } 1612 std::vector<DataType> *operator&() { return &Storage; } 1613 const std::vector<DataType> *operator&() const { return &Storage; } 1614 1615 template <class T> void addValue(const T &V) { Storage.push_back(V); } 1616}; 1617 1618//===----------------------------------------------------------------------===// 1619// list - A list of command line options. 1620// 1621template <class DataType, class StorageClass = bool, 1622 class ParserClass = parser<DataType>> 1623class list : public Option, public list_storage<DataType, StorageClass> { 1624 std::vector<unsigned> Positions; 1625 ParserClass Parser; 1626 1627 enum ValueExpected getValueExpectedFlagDefault() const override { 1628 return Parser.getValueExpectedFlagDefault(); 1629 } 1630 1631 void getExtraOptionNames(SmallVectorImpl<StringRef> &OptionNames) override { 1632 return Parser.getExtraOptionNames(OptionNames); 1633 } 1634 1635 bool handleOccurrence(unsigned pos, StringRef ArgName, 1636 StringRef Arg) override { 1637 typename ParserClass::parser_data_type Val = 1638 typename ParserClass::parser_data_type(); 1639 if (Parser.parse(*this, ArgName, Arg, Val)) 1640 return true; // Parse Error! 1641 list_storage<DataType, StorageClass>::addValue(Val); 1642 setPosition(pos); 1643 Positions.push_back(pos); 1644 Callback(Val); 1645 return false; 1646 } 1647 1648 // Forward printing stuff to the parser... 1649 size_t getOptionWidth() const override { 1650 return Parser.getOptionWidth(*this); 1651 } 1652 1653 void printOptionInfo(size_t GlobalWidth) const override { 1654 Parser.printOptionInfo(*this, GlobalWidth); 1655 } 1656 1657 // Unimplemented: list options don't currently store their default value. 1658 void printOptionValue(size_t /*GlobalWidth*/, bool /*Force*/) const override { 1659 } 1660 1661 void setDefault() override { 1662 Positions.clear(); 1663 list_storage<DataType, StorageClass>::clear(); 1664 } 1665 1666 void done() { 1667 addArgument(); 1668 Parser.initialize(); 1669 } 1670 1671public: 1672 // Command line options should not be copyable 1673 list(const list &) = delete; 1674 list &operator=(const list &) = delete; 1675 1676 ParserClass &getParser() { return Parser; } 1677 1678 unsigned getPosition(unsigned optnum) const { 1679 assert(optnum < this->size() && "Invalid option index"); 1680 return Positions[optnum]; 1681 } 1682 1683 void setNumAdditionalVals(unsigned n) { Option::setNumAdditionalVals(n); } 1684 1685 template <class... Mods> 1686 explicit list(const Mods &... Ms) 1687 : Option(ZeroOrMore, NotHidden), Parser(*this) { 1688 apply(this, Ms...); 1689 done(); 1690 } 1691 1692 void setCallback( 1693 std::function<void(const typename ParserClass::parser_data_type &)> CB) { 1694 Callback = CB; 1695 } 1696 1697 std::function<void(const typename ParserClass::parser_data_type &)> Callback = 1698 [](const typename ParserClass::parser_data_type &) {}; 1699}; 1700 1701// multi_val - Modifier to set the number of additional values. 1702struct multi_val { 1703 unsigned AdditionalVals; 1704 explicit multi_val(unsigned N) : AdditionalVals(N) {} 1705 1706 template <typename D, typename S, typename P> 1707 void apply(list<D, S, P> &L) const { 1708 L.setNumAdditionalVals(AdditionalVals); 1709 } 1710}; 1711 1712//===----------------------------------------------------------------------===// 1713// bits_storage class 1714 1715// Default storage class definition: external storage. This implementation 1716// assumes the user will specify a variable to store the data into with the 1717// cl::location(x) modifier. 1718// 1719template <class DataType, class StorageClass> class bits_storage { 1720 unsigned *Location = nullptr; // Where to store the bits... 1721 1722 template <class T> static unsigned Bit(const T &V) { 1723 unsigned BitPos = reinterpret_cast<unsigned>(V); 1724 assert(BitPos < sizeof(unsigned) * CHAR_BIT && 1725 "enum exceeds width of bit vector!"); 1726 return 1 << BitPos; 1727 } 1728 1729public: 1730 bits_storage() = default; 1731 1732 bool setLocation(Option &O, unsigned &L) { 1733 if (Location) 1734 return O.error("cl::location(x) specified more than once!"); 1735 Location = &L; 1736 return false; 1737 } 1738 1739 template <class T> void addValue(const T &V) { 1740 assert(Location != 0 && "cl::location(...) not specified for a command " 1741 "line option with external storage!"); 1742 *Location |= Bit(V); 1743 } 1744 1745 unsigned getBits() { return *Location; } 1746 1747 template <class T> bool isSet(const T &V) { 1748 return (*Location & Bit(V)) != 0; 1749 } 1750}; 1751 1752// Define how to hold bits. Since we can inherit from a class, we do so. 1753// This makes us exactly compatible with the bits in all cases that it is used. 1754// 1755template <class DataType> class bits_storage<DataType, bool> { 1756 unsigned Bits; // Where to store the bits... 1757 1758 template <class T> static unsigned Bit(const T &V) { 1759 unsigned BitPos = (unsigned)V; 1760 assert(BitPos < sizeof(unsigned) * CHAR_BIT && 1761 "enum exceeds width of bit vector!"); 1762 return 1 << BitPos; 1763 } 1764 1765public: 1766 template <class T> void addValue(const T &V) { Bits |= Bit(V); } 1767 1768 unsigned getBits() { return Bits; } 1769 1770 template <class T> bool isSet(const T &V) { return (Bits & Bit(V)) != 0; } 1771}; 1772 1773//===----------------------------------------------------------------------===// 1774// bits - A bit vector of command options. 1775// 1776template <class DataType, class Storage = bool, 1777 class ParserClass = parser<DataType>> 1778class bits : public Option, public bits_storage<DataType, Storage> { 1779 std::vector<unsigned> Positions; 1780 ParserClass Parser; 1781 1782 enum ValueExpected getValueExpectedFlagDefault() const override { 1783 return Parser.getValueExpectedFlagDefault(); 1784 } 1785 1786 void getExtraOptionNames(SmallVectorImpl<StringRef> &OptionNames) override { 1787 return Parser.getExtraOptionNames(OptionNames); 1788 } 1789 1790 bool handleOccurrence(unsigned pos, StringRef ArgName, 1791 StringRef Arg) override { 1792 typename ParserClass::parser_data_type Val = 1793 typename ParserClass::parser_data_type(); 1794 if (Parser.parse(*this, ArgName, Arg, Val)) 1795 return true; // Parse Error! 1796 this->addValue(Val); 1797 setPosition(pos); 1798 Positions.push_back(pos); 1799 Callback(Val); 1800 return false; 1801 } 1802 1803 // Forward printing stuff to the parser... 1804 size_t getOptionWidth() const override { 1805 return Parser.getOptionWidth(*this); 1806 } 1807 1808 void printOptionInfo(size_t GlobalWidth) const override { 1809 Parser.printOptionInfo(*this, GlobalWidth); 1810 } 1811 1812 // Unimplemented: bits options don't currently store their default values. 1813 void printOptionValue(size_t /*GlobalWidth*/, bool /*Force*/) const override { 1814 } 1815 1816 void setDefault() override {} 1817 1818 void done() { 1819 addArgument(); 1820 Parser.initialize(); 1821 } 1822 1823public: 1824 // Command line options should not be copyable 1825 bits(const bits &) = delete; 1826 bits &operator=(const bits &) = delete; 1827 1828 ParserClass &getParser() { return Parser; } 1829 1830 unsigned getPosition(unsigned optnum) const { 1831 assert(optnum < this->size() && "Invalid option index"); 1832 return Positions[optnum]; 1833 } 1834 1835 template <class... Mods> 1836 explicit bits(const Mods &... Ms) 1837 : Option(ZeroOrMore, NotHidden), Parser(*this) { 1838 apply(this, Ms...); 1839 done(); 1840 } 1841 1842 void setCallback( 1843 std::function<void(const typename ParserClass::parser_data_type &)> CB) { 1844 Callback = CB; 1845 } 1846 1847 std::function<void(const typename ParserClass::parser_data_type &)> Callback = 1848 [](const typename ParserClass::parser_data_type &) {}; 1849}; 1850 1851//===----------------------------------------------------------------------===// 1852// Aliased command line option (alias this name to a preexisting name) 1853// 1854 1855class alias : public Option { 1856 Option *AliasFor; 1857 1858 bool handleOccurrence(unsigned pos, StringRef /*ArgName*/, 1859 StringRef Arg) override { 1860 return AliasFor->handleOccurrence(pos, AliasFor->ArgStr, Arg); 1861 } 1862 1863 bool addOccurrence(unsigned pos, StringRef /*ArgName*/, StringRef Value, 1864 bool MultiArg = false) override { 1865 return AliasFor->addOccurrence(pos, AliasFor->ArgStr, Value, MultiArg); 1866 } 1867 1868 // Handle printing stuff... 1869 size_t getOptionWidth() const override; 1870 void printOptionInfo(size_t GlobalWidth) const override; 1871 1872 // Aliases do not need to print their values. 1873 void printOptionValue(size_t /*GlobalWidth*/, bool /*Force*/) const override { 1874 } 1875 1876 void setDefault() override { AliasFor->setDefault(); } 1877 1878 ValueExpected getValueExpectedFlagDefault() const override { 1879 return AliasFor->getValueExpectedFlag(); 1880 } 1881 1882 void done() { 1883 if (!hasArgStr()) 1884 error("cl::alias must have argument name specified!"); 1885 if (!AliasFor) 1886 error("cl::alias must have an cl::aliasopt(option) specified!"); 1887 if (!Subs.empty()) 1888 error("cl::alias must not have cl::sub(), aliased option's cl::sub() will be used!"); 1889 Subs = AliasFor->Subs; 1890 Categories = AliasFor->Categories; 1891 addArgument(); 1892 } 1893 1894public: 1895 // Command line options should not be copyable 1896 alias(const alias &) = delete; 1897 alias &operator=(const alias &) = delete; 1898 1899 void setAliasFor(Option &O) { 1900 if (AliasFor) 1901 error("cl::alias must only have one cl::aliasopt(...) specified!"); 1902 AliasFor = &O; 1903 } 1904 1905 template <class... Mods> 1906 explicit alias(const Mods &... Ms) 1907 : Option(Optional, Hidden), AliasFor(nullptr) { 1908 apply(this, Ms...); 1909 done(); 1910 } 1911}; 1912 1913// aliasfor - Modifier to set the option an alias aliases. 1914struct aliasopt { 1915 Option &Opt; 1916 1917 explicit aliasopt(Option &O) : Opt(O) {} 1918 1919 void apply(alias &A) const { A.setAliasFor(Opt); } 1920}; 1921 1922// extrahelp - provide additional help at the end of the normal help 1923// output. All occurrences of cl::extrahelp will be accumulated and 1924// printed to stderr at the end of the regular help, just before 1925// exit is called. 1926struct extrahelp { 1927 StringRef morehelp; 1928 1929 explicit extrahelp(StringRef help); 1930}; 1931 1932void PrintVersionMessage(); 1933 1934/// This function just prints the help message, exactly the same way as if the 1935/// -help or -help-hidden option had been given on the command line. 1936/// 1937/// \param Hidden if true will print hidden options 1938/// \param Categorized if true print options in categories 1939void PrintHelpMessage(bool Hidden = false, bool Categorized = false); 1940 1941//===----------------------------------------------------------------------===// 1942// Public interface for accessing registered options. 1943// 1944 1945/// Use this to get a StringMap to all registered named options 1946/// (e.g. -help). 1947/// 1948/// \return A reference to the StringMap used by the cl APIs to parse options. 1949/// 1950/// Access to unnamed arguments (i.e. positional) are not provided because 1951/// it is expected that the client already has access to these. 1952/// 1953/// Typical usage: 1954/// \code 1955/// main(int argc,char* argv[]) { 1956/// StringMap<llvm::cl::Option*> &opts = llvm::cl::getRegisteredOptions(); 1957/// assert(opts.count("help") == 1) 1958/// opts["help"]->setDescription("Show alphabetical help information") 1959/// // More code 1960/// llvm::cl::ParseCommandLineOptions(argc,argv); 1961/// //More code 1962/// } 1963/// \endcode 1964/// 1965/// This interface is useful for modifying options in libraries that are out of 1966/// the control of the client. The options should be modified before calling 1967/// llvm::cl::ParseCommandLineOptions(). 1968/// 1969/// Hopefully this API can be deprecated soon. Any situation where options need 1970/// to be modified by tools or libraries should be handled by sane APIs rather 1971/// than just handing around a global list. 1972StringMap<Option *> &getRegisteredOptions(SubCommand &Sub = *TopLevelSubCommand); 1973 1974/// Use this to get all registered SubCommands from the provided parser. 1975/// 1976/// \return A range of all SubCommand pointers registered with the parser. 1977/// 1978/// Typical usage: 1979/// \code 1980/// main(int argc, char* argv[]) { 1981/// llvm::cl::ParseCommandLineOptions(argc, argv); 1982/// for (auto* S : llvm::cl::getRegisteredSubcommands()) { 1983/// if (*S) { 1984/// std::cout << "Executing subcommand: " << S->getName() << std::endl; 1985/// // Execute some function based on the name... 1986/// } 1987/// } 1988/// } 1989/// \endcode 1990/// 1991/// This interface is useful for defining subcommands in libraries and 1992/// the dispatch from a single point (like in the main function). 1993iterator_range<typename SmallPtrSet<SubCommand *, 4>::iterator> 1994getRegisteredSubcommands(); 1995 1996//===----------------------------------------------------------------------===// 1997// Standalone command line processing utilities. 1998// 1999 2000/// Tokenizes a command line that can contain escapes and quotes. 2001// 2002/// The quoting rules match those used by GCC and other tools that use 2003/// libiberty's buildargv() or expandargv() utilities, and do not match bash. 2004/// They differ from buildargv() on treatment of backslashes that do not escape 2005/// a special character to make it possible to accept most Windows file paths. 2006/// 2007/// \param [in] Source The string to be split on whitespace with quotes. 2008/// \param [in] Saver Delegates back to the caller for saving parsed strings. 2009/// \param [in] MarkEOLs true if tokenizing a response file and you want end of 2010/// lines and end of the response file to be marked with a nullptr string. 2011/// \param [out] NewArgv All parsed strings are appended to NewArgv. 2012void TokenizeGNUCommandLine(StringRef Source, StringSaver &Saver, 2013 SmallVectorImpl<const char *> &NewArgv, 2014 bool MarkEOLs = false); 2015 2016/// Tokenizes a Windows command line which may contain quotes and escaped 2017/// quotes. 2018/// 2019/// See MSDN docs for CommandLineToArgvW for information on the quoting rules. 2020/// http://msdn.microsoft.com/en-us/library/windows/desktop/17w5ykft(v=vs.85).aspx 2021/// 2022/// \param [in] Source The string to be split on whitespace with quotes. 2023/// \param [in] Saver Delegates back to the caller for saving parsed strings. 2024/// \param [in] MarkEOLs true if tokenizing a response file and you want end of 2025/// lines and end of the response file to be marked with a nullptr string. 2026/// \param [out] NewArgv All parsed strings are appended to NewArgv. 2027void TokenizeWindowsCommandLine(StringRef Source, StringSaver &Saver, 2028 SmallVectorImpl<const char *> &NewArgv, 2029 bool MarkEOLs = false); 2030 2031/// String tokenization function type. Should be compatible with either 2032/// Windows or Unix command line tokenizers. 2033using TokenizerCallback = void (*)(StringRef Source, StringSaver &Saver, 2034 SmallVectorImpl<const char *> &NewArgv, 2035 bool MarkEOLs); 2036 2037/// Tokenizes content of configuration file. 2038/// 2039/// \param [in] Source The string representing content of config file. 2040/// \param [in] Saver Delegates back to the caller for saving parsed strings. 2041/// \param [out] NewArgv All parsed strings are appended to NewArgv. 2042/// \param [in] MarkEOLs Added for compatibility with TokenizerCallback. 2043/// 2044/// It works like TokenizeGNUCommandLine with ability to skip comment lines. 2045/// 2046void tokenizeConfigFile(StringRef Source, StringSaver &Saver, 2047 SmallVectorImpl<const char *> &NewArgv, 2048 bool MarkEOLs = false); 2049 2050/// Reads command line options from the given configuration file. 2051/// 2052/// \param [in] CfgFileName Path to configuration file. 2053/// \param [in] Saver Objects that saves allocated strings. 2054/// \param [out] Argv Array to which the read options are added. 2055/// \return true if the file was successfully read. 2056/// 2057/// It reads content of the specified file, tokenizes it and expands "@file" 2058/// commands resolving file names in them relative to the directory where 2059/// CfgFilename resides. 2060/// 2061bool readConfigFile(StringRef CfgFileName, StringSaver &Saver, 2062 SmallVectorImpl<const char *> &Argv); 2063 2064/// Expand response files on a command line recursively using the given 2065/// StringSaver and tokenization strategy. Argv should contain the command line 2066/// before expansion and will be modified in place. If requested, Argv will 2067/// also be populated with nullptrs indicating where each response file line 2068/// ends, which is useful for the "/link" argument that needs to consume all 2069/// remaining arguments only until the next end of line, when in a response 2070/// file. 2071/// 2072/// \param [in] Saver Delegates back to the caller for saving parsed strings. 2073/// \param [in] Tokenizer Tokenization strategy. Typically Unix or Windows. 2074/// \param [in,out] Argv Command line into which to expand response files. 2075/// \param [in] MarkEOLs Mark end of lines and the end of the response file 2076/// with nullptrs in the Argv vector. 2077/// \param [in] RelativeNames true if names of nested response files must be 2078/// resolved relative to including file. 2079/// \param [in] FS File system used for all file access when running the tool. 2080/// \param [in] CurrentDir Path used to resolve relative rsp files. If set to 2081/// None, process' cwd is used instead. 2082/// \return true if all @files were expanded successfully or there were none. 2083bool ExpandResponseFiles( 2084 StringSaver &Saver, TokenizerCallback Tokenizer, 2085 SmallVectorImpl<const char *> &Argv, bool MarkEOLs = false, 2086 bool RelativeNames = false, 2087 llvm::vfs::FileSystem &FS = *llvm::vfs::getRealFileSystem(), 2088 llvm::Optional<llvm::StringRef> CurrentDir = llvm::None); 2089 2090/// Mark all options not part of this category as cl::ReallyHidden. 2091/// 2092/// \param Category the category of options to keep displaying 2093/// 2094/// Some tools (like clang-format) like to be able to hide all options that are 2095/// not specific to the tool. This function allows a tool to specify a single 2096/// option category to display in the -help output. 2097void HideUnrelatedOptions(cl::OptionCategory &Category, 2098 SubCommand &Sub = *TopLevelSubCommand); 2099 2100/// Mark all options not part of the categories as cl::ReallyHidden. 2101/// 2102/// \param Categories the categories of options to keep displaying. 2103/// 2104/// Some tools (like clang-format) like to be able to hide all options that are 2105/// not specific to the tool. This function allows a tool to specify a single 2106/// option category to display in the -help output. 2107void HideUnrelatedOptions(ArrayRef<const cl::OptionCategory *> Categories, 2108 SubCommand &Sub = *TopLevelSubCommand); 2109 2110/// Reset all command line options to a state that looks as if they have 2111/// never appeared on the command line. This is useful for being able to parse 2112/// a command line multiple times (especially useful for writing tests). 2113void ResetAllOptionOccurrences(); 2114 2115/// Reset the command line parser back to its initial state. This 2116/// removes 2117/// all options, categories, and subcommands and returns the parser to a state 2118/// where no options are supported. 2119void ResetCommandLineParser(); 2120 2121/// Parses `Arg` into the option handler `Handler`. 2122bool ProvidePositionalOption(Option *Handler, StringRef Arg, int i); 2123 2124} // end namespace cl 2125 2126} // end namespace llvm 2127 2128#endif // LLVM_SUPPORT_COMMANDLINE_H 2129