//===- llvm/Support/CommandLine.h - Command line handler --------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This class implements a command line argument processor that is useful when
// creating a tool. It provides a simple, minimalistic interface that is easily
// extensible and supports nonlocal (library) command line options.
//
// Note that rather than trying to figure out what this code does, you should
// read the library documentation located in docs/CommandLine.html or looks at
// the many example usages in tools/*/*.cpp
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_COMMANDLINE_H
#define LLVM_SUPPORT_COMMANDLINE_H
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Twine.h"
#include "llvm/ADT/iterator_range.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/ManagedStatic.h"
#include <cassert>
#include <climits>
#include <cstddef>
#include <functional>
#include <initializer_list>
#include <string>
#include <type_traits>
#include <vector>
namespace llvm {
class StringSaver;
class raw_ostream;
/// cl Namespace - This namespace contains all of the command line option
/// processing machinery. It is intentionally a short name to make qualified
/// usage concise.
namespace cl {
//===----------------------------------------------------------------------===//
// ParseCommandLineOptions - Command line option processing entry point.
//
// Returns true on success. Otherwise, this will print the error message to
// stderr and exit if \p Errs is not set (nullptr by default), or print the
// error message to \p Errs and return false if \p Errs is provided.
bool ParseCommandLineOptions(int argc, const char *const *argv,
StringRef Overview = "",
raw_ostream *Errs = nullptr);
//===----------------------------------------------------------------------===//
// ParseEnvironmentOptions - Environment variable option processing alternate
// entry point.
//
void ParseEnvironmentOptions(const char *progName, const char *envvar,
const char *Overview = "");
// Function pointer type for printing version information.
using VersionPrinterTy = std::function<void(raw_ostream &)>;
///===---------------------------------------------------------------------===//
/// SetVersionPrinter - Override the default (LLVM specific) version printer
/// used to print out the version when --version is given
/// on the command line. This allows other systems using the
/// CommandLine utilities to print their own version string.
void SetVersionPrinter(VersionPrinterTy func);
///===---------------------------------------------------------------------===//
/// AddExtraVersionPrinter - Add an extra printer to use in addition to the
/// default one. This can be called multiple times,
/// and each time it adds a new function to the list
/// which will be called after the basic LLVM version
/// printing is complete. Each can then add additional
/// information specific to the tool.
void AddExtraVersionPrinter(VersionPrinterTy func);
// PrintOptionValues - Print option values.
// With -print-options print the difference between option values and defaults.
// With -print-all-options print all option values.
// (Currently not perfect, but best-effort.)
void PrintOptionValues();
// Forward declaration - AddLiteralOption needs to be up here to make gcc happy.
class Option;
/// \brief Adds a new option for parsing and provides the option it refers to.
///
/// \param O pointer to the option
/// \param Name the string name for the option to handle during parsing
///
/// Literal options are used by some parsers to register special option values.
/// This is how the PassNameParser registers pass names for opt.
void AddLiteralOption(Option &O, StringRef Name);
//===----------------------------------------------------------------------===//
// Flags permitted to be passed to command line arguments
//
enum NumOccurrencesFlag { // Flags for the number of occurrences allowed
Optional = 0x00, // Zero or One occurrence
ZeroOrMore = 0x01, // Zero or more occurrences allowed
Required = 0x02, // One occurrence required
OneOrMore = 0x03, // One or more occurrences required
// ConsumeAfter - Indicates that this option is fed anything that follows the
// last positional argument required by the application (it is an error if
// there are zero positional arguments, and a ConsumeAfter option is used).
// Thus, for example, all arguments to LLI are processed until a filename is
// found. Once a filename is found, all of the succeeding arguments are
// passed, unprocessed, to the ConsumeAfter option.
//
ConsumeAfter = 0x04
};
enum ValueExpected { // Is a value required for the option?
// zero reserved for the unspecified value
ValueOptional = 0x01, // The value can appear... or not
ValueRequired = 0x02, // The value is required to appear!
ValueDisallowed = 0x03 // A value may not be specified (for flags)
};
enum OptionHidden { // Control whether -help shows this option
NotHidden = 0x00, // Option included in -help & -help-hidden
Hidden = 0x01, // -help doesn't, but -help-hidden does
ReallyHidden = 0x02 // Neither -help nor -help-hidden show this arg
};
// Formatting flags - This controls special features that the option might have
// that cause it to be parsed differently...
//
// Prefix - This option allows arguments that are otherwise unrecognized to be
// matched by options that are a prefix of the actual value. This is useful for
// cases like a linker, where options are typically of the form '-lfoo' or
// '-L../../include' where -l or -L are the actual flags. When prefix is
// enabled, and used, the value for the flag comes from the suffix of the
// argument.
//
// Grouping - With this option enabled, multiple letter options are allowed to
// bunch together with only a single hyphen for the whole group. This allows
// emulation of the behavior that ls uses for example: ls -la === ls -l -a
//
enum FormattingFlags {
NormalFormatting = 0x00, // Nothing special
Positional = 0x01, // Is a positional argument, no '-' required
Prefix = 0x02, // Can this option directly prefix its value?
Grouping = 0x03 // Can this option group with other options?
};
enum MiscFlags { // Miscellaneous flags to adjust argument
CommaSeparated = 0x01, // Should this cl::list split between commas?
PositionalEatsArgs = 0x02, // Should this positional cl::list eat -args?
Sink = 0x04 // Should this cl::list eat all unknown options?
};
//===----------------------------------------------------------------------===//
// Option Category class
//
class OptionCategory {
private:
StringRef const Name;
StringRef const Description;
void registerCategory();
public:
OptionCategory(StringRef const Name,
StringRef const Description = "")
: Name(Name), Description(Description) {
registerCategory();
}
StringRef getName() const { return Name; }
StringRef getDescription() const { return Description; }
};
// The general Option Category (used as default category).
extern OptionCategory GeneralCategory;
//===----------------------------------------------------------------------===//
// SubCommand class
//
class SubCommand {
private:
StringRef Name;
StringRef Description;
protected:
void registerSubCommand();
void unregisterSubCommand();
public:
SubCommand(StringRef Name, StringRef Description = "")
: Name(Name), Description(Description) {
registerSubCommand();
}
SubCommand() = default;
void reset();
explicit operator bool() const;
StringRef getName() const { return Name; }
StringRef getDescription() const { return Description; }
SmallVector<Option *, 4> PositionalOpts;
SmallVector<Option *, 4> SinkOpts;
StringMap<Option *> OptionsMap;
Option *ConsumeAfterOpt = nullptr; // The ConsumeAfter option if it exists.
};
// A special subcommand representing no subcommand
extern ManagedStatic<SubCommand> TopLevelSubCommand;
// A special subcommand that can be used to put an option into all subcommands.
extern ManagedStatic<SubCommand> AllSubCommands;
//===----------------------------------------------------------------------===//
// Option Base class
//
class Option {
friend class alias;
// handleOccurrences - Overriden by subclasses to handle the value passed into
// an argument. Should return true if there was an error processing the
// argument and the program should exit.
//
virtual bool handleOccurrence(unsigned pos, StringRef ArgName,
StringRef Arg) = 0;
virtual enum ValueExpected getValueExpectedFlagDefault() const {
return ValueOptional;
}
// Out of line virtual function to provide home for the class.
virtual void anchor();
int NumOccurrences = 0; // The number of times specified
// Occurrences, HiddenFlag, and Formatting are all enum types but to avoid
// problems with signed enums in bitfields.
unsigned Occurrences : 3; // enum NumOccurrencesFlag
// not using the enum type for 'Value' because zero is an implementation
// detail representing the non-value
unsigned Value : 2;
unsigned HiddenFlag : 2; // enum OptionHidden
unsigned Formatting : 2; // enum FormattingFlags
unsigned Misc : 3;
unsigned Position = 0; // Position of last occurrence of the option
unsigned AdditionalVals = 0; // Greater than 0 for multi-valued option.
public:
StringRef ArgStr; // The argument string itself (ex: "help", "o")
StringRef HelpStr; // The descriptive text message for -help
StringRef ValueStr; // String describing what the value of this option is
OptionCategory *Category; // The Category this option belongs to
SmallPtrSet<SubCommand *, 4> Subs; // The subcommands this option belongs to.
bool FullyInitialized = false; // Has addArguemnt been called?
inline enum NumOccurrencesFlag getNumOccurrencesFlag() const {
return (enum NumOccurrencesFlag)Occurrences;
}
inline enum ValueExpected getValueExpectedFlag() const {
return Value ? ((enum ValueExpected)Value) : getValueExpectedFlagDefault();
}
inline enum OptionHidden getOptionHiddenFlag() const {
return (enum OptionHidden)HiddenFlag;
}
inline enum FormattingFlags getFormattingFlag() const {
return (enum FormattingFlags)Formatting;
}
inline unsigned getMiscFlags() const { return Misc; }
inline unsigned getPosition() const { return Position; }
inline unsigned getNumAdditionalVals() const { return AdditionalVals; }
// hasArgStr - Return true if the argstr != ""
bool hasArgStr() const { return !ArgStr.empty(); }
bool isPositional() const { return getFormattingFlag() == cl::Positional; }
bool isSink() const { return getMiscFlags() & cl::Sink; }
bool isConsumeAfter() const {
return getNumOccurrencesFlag() == cl::ConsumeAfter;
}
bool isInAllSubCommands() const {
return any_of(Subs, [](const SubCommand *SC) {
return SC == &*AllSubCommands;
});
}
//-------------------------------------------------------------------------===
// Accessor functions set by OptionModifiers
//
void setArgStr(StringRef S);
void setDescription(StringRef S) { HelpStr = S; }
void setValueStr(StringRef S) { ValueStr = S; }
void setNumOccurrencesFlag(enum NumOccurrencesFlag Val) { Occurrences = Val; }
void setValueExpectedFlag(enum ValueExpected Val) { Value = Val; }
void setHiddenFlag(enum OptionHidden Val) { HiddenFlag = Val; }
void setFormattingFlag(enum FormattingFlags V) { Formatting = V; }
void setMiscFlag(enum MiscFlags M) { Misc |= M; }
void setPosition(unsigned pos) { Position = pos; }
void setCategory(OptionCategory &C) { Category = &C; }
void addSubCommand(SubCommand &S) { Subs.insert(&S); }
protected:
explicit Option(enum NumOccurrencesFlag OccurrencesFlag,
enum OptionHidden Hidden)
: Occurrences(OccurrencesFlag), Value(0), HiddenFlag(Hidden),
Formatting(NormalFormatting), Misc(0), Category(&GeneralCategory) {}
inline void setNumAdditionalVals(unsigned n) { AdditionalVals = n; }
public:
virtual ~Option() = default;
// addArgument - Register this argument with the commandline system.
//
void addArgument();
/// Unregisters this option from the CommandLine system.
///
/// This option must have been the last option registered.
/// For testing purposes only.
void removeArgument();
// Return the width of the option tag for printing...
virtual size_t getOptionWidth() const = 0;
// printOptionInfo - Print out information about this option. The
// to-be-maintained width is specified.
//
virtual void printOptionInfo(size_t GlobalWidth) const = 0;
virtual void printOptionValue(size_t GlobalWidth, bool Force) const = 0;
static void printHelpStr(StringRef HelpStr, size_t Indent,
size_t FirstLineIndentedBy);
virtual void getExtraOptionNames(SmallVectorImpl<StringRef> &) {}
// addOccurrence - Wrapper around handleOccurrence that enforces Flags.
//
virtual bool addOccurrence(unsigned pos, StringRef ArgName, StringRef Value,
bool MultiArg = false);
// Prints option name followed by message. Always returns true.
bool error(const Twine &Message, StringRef ArgName = StringRef());
inline int getNumOccurrences() const { return NumOccurrences; }
inline void reset() { NumOccurrences = 0; }
};
//===----------------------------------------------------------------------===//
// Command line option modifiers that can be used to modify the behavior of
// command line option parsers...
//
// desc - Modifier to set the description shown in the -help output...
struct desc {
StringRef Desc;
desc(StringRef Str) : Desc(Str) {}
void apply(Option &O) const { O.setDescription(Desc); }
};
// value_desc - Modifier to set the value description shown in the -help
// output...
struct value_desc {
StringRef Desc;
value_desc(StringRef Str) : Desc(Str) {}
void apply(Option &O) const { O.setValueStr(Desc); }
};
// init - Specify a default (initial) value for the command line argument, if
// the default constructor for the argument type does not give you what you
// want. This is only valid on "opt" arguments, not on "list" arguments.
//
template <class Ty> struct initializer {
const Ty &Init;
initializer(const Ty &Val) : Init(Val) {}
template <class Opt> void apply(Opt &O) const { O.setInitialValue(Init); }
};
template <class Ty> initializer<Ty> init(const Ty &Val) {
return initializer<Ty>(Val);
}
// location - Allow the user to specify which external variable they want to
// store the results of the command line argument processing into, if they don't
// want to store it in the option itself.
//
template <class Ty> struct LocationClass {
Ty &Loc;
LocationClass(Ty &L) : Loc(L) {}
template <class Opt> void apply(Opt &O) const { O.setLocation(O, Loc); }
};
template <class Ty> LocationClass<Ty> location(Ty &L) {
return LocationClass<Ty>(L);
}
// cat - Specifiy the Option category for the command line argument to belong
// to.
struct cat {
OptionCategory &Category;
cat(OptionCategory &c) : Category(c) {}
template <class Opt> void apply(Opt &O) const { O.setCategory(Category); }
};
// sub - Specify the subcommand that this option belongs to.
struct sub {
SubCommand ⋐
sub(SubCommand &S) : Sub(S) {}
template <class Opt> void apply(Opt &O) const { O.addSubCommand(Sub); }
};
//===----------------------------------------------------------------------===//
// OptionValue class
// Support value comparison outside the template.
struct GenericOptionValue {
virtual bool compare(const GenericOptionValue &V) const = 0;
protected:
GenericOptionValue() = default;
GenericOptionValue(const GenericOptionValue&) = default;
GenericOptionValue &operator=(const GenericOptionValue &) = default;
~GenericOptionValue() = default;
private:
virtual void anchor();
};
template <class DataType> struct OptionValue;
// The default value safely does nothing. Option value printing is only
// best-effort.
template <class DataType, bool isClass>
struct OptionValueBase : public GenericOptionValue {
// Temporary storage for argument passing.
using WrapperType = OptionValue<DataType>;
bool hasValue() const { return false; }
const DataType &getValue() const { llvm_unreachable("no default value"); }
// Some options may take their value from a different data type.
template <class DT> void setValue(const DT & /*V*/) {}
bool compare(const DataType & /*V*/) const { return false; }
bool compare(const GenericOptionValue & /*V*/) const override {
return false;
}
protected:
~OptionValueBase() = default;
};
// Simple copy of the option value.
template <class DataType> class OptionValueCopy : public GenericOptionValue {
DataType Value;
bool Valid = false;
protected:
OptionValueCopy(const OptionValueCopy&) = default;
OptionValueCopy &operator=(const OptionValueCopy &) = default;
~OptionValueCopy() = default;
public:
OptionValueCopy() = default;
bool hasValue() const { return Valid; }
const DataType &getValue() const {
assert(Valid && "invalid option value");
return Value;
}
void setValue(const DataType &V) {
Valid = true;
Value = V;
}
bool compare(const DataType &V) const { return Valid && (Value != V); }
bool compare(const GenericOptionValue &V) const override {
const OptionValueCopy<DataType> &VC =
static_cast<const OptionValueCopy<DataType> &>(V);
if (!VC.hasValue())
return false;
return compare(VC.getValue());
}
};
// Non-class option values.
template <class DataType>
struct OptionValueBase<DataType, false> : OptionValueCopy<DataType> {
using WrapperType = DataType;
protected:
OptionValueBase() = default;
OptionValueBase(const OptionValueBase&) = default;
OptionValueBase &operator=(const OptionValueBase &) = default;
~OptionValueBase() = default;
};
// Top-level option class.
template <class DataType>
struct OptionValue final
: OptionValueBase<DataType, std::is_class<DataType>::value> {
OptionValue() = default;
OptionValue(const DataType &V) { this->setValue(V); }
// Some options may take their value from a different data type.
template <class DT> OptionValue<DataType> &operator=(const DT &V) {
this->setValue(V);
return *this;
}
};
// Other safe-to-copy-by-value common option types.
enum boolOrDefault { BOU_UNSET, BOU_TRUE, BOU_FALSE };
template <>
struct OptionValue<cl::boolOrDefault> final
: OptionValueCopy<cl::boolOrDefault> {
using WrapperType = cl::boolOrDefault;
OptionValue() = default;
OptionValue(const cl::boolOrDefault &V) { this->setValue(V); }
OptionValue<cl::boolOrDefault> &operator=(const cl::boolOrDefault &V) {
setValue(V);
return *this;
}
private:
void anchor() override;
};
template <>
struct OptionValue<std::string> final : OptionValueCopy<std::string> {
using WrapperType = StringRef;
OptionValue() = default;
OptionValue(const std::string &V) { this->setValue(V); }
OptionValue<std::string> &operator=(const std::string &V) {
setValue(V);
return *this;
}
private:
void anchor() override;
};
//===----------------------------------------------------------------------===//
// Enum valued command line option
//
// This represents a single enum value, using "int" as the underlying type.
struct OptionEnumValue {
StringRef Name;
int Value;
StringRef Description;
};
#define clEnumVal(ENUMVAL, DESC) \
llvm::cl::OptionEnumValue { #ENUMVAL, int(ENUMVAL), DESC }
#define clEnumValN(ENUMVAL, FLAGNAME, DESC) \
llvm::cl::OptionEnumValue { FLAGNAME, int(ENUMVAL), DESC }
// values - For custom data types, allow specifying a group of values together
// as the values that go into the mapping that the option handler uses.
//
class ValuesClass {
// Use a vector instead of a map, because the lists should be short,
// the overhead is less, and most importantly, it keeps them in the order
// inserted so we can print our option out nicely.
SmallVector<OptionEnumValue, 4> Values;
public:
ValuesClass(std::initializer_list<OptionEnumValue> Options)
: Values(Options) {}
template <class Opt> void apply(Opt &O) const {
for (auto Value : Values)
O.getParser().addLiteralOption(Value.Name, Value.Value,
Value.Description);
}
};
/// Helper to build a ValuesClass by forwarding a variable number of arguments
/// as an initializer list to the ValuesClass constructor.
template <typename... OptsTy> ValuesClass values(OptsTy... Options) {
return ValuesClass({Options...});
}
//===----------------------------------------------------------------------===//
// parser class - Parameterizable parser for different data types. By default,
// known data types (string, int, bool) have specialized parsers, that do what
// you would expect. The default parser, used for data types that are not
// built-in, uses a mapping table to map specific options to values, which is
// used, among other things, to handle enum types.
//--------------------------------------------------
// generic_parser_base - This class holds all the non-generic code that we do
// not need replicated for every instance of the generic parser. This also
// allows us to put stuff into CommandLine.cpp
//
class generic_parser_base {
protected:
class GenericOptionInfo {
public:
GenericOptionInfo(StringRef name, StringRef helpStr)
: Name(name), HelpStr(helpStr) {}
StringRef Name;
StringRef HelpStr;
};
public:
generic_parser_base(Option &O) : Owner(O) {}
virtual ~generic_parser_base() = default;
// Base class should have virtual-destructor
// getNumOptions - Virtual function implemented by generic subclass to
// indicate how many entries are in Values.
//
virtual unsigned getNumOptions() const = 0;
// getOption - Return option name N.
virtual StringRef getOption(unsigned N) const = 0;
// getDescription - Return description N
virtual StringRef getDescription(unsigned N) const = 0;
// Return the width of the option tag for printing...
virtual size_t getOptionWidth(const Option &O) const;
virtual const GenericOptionValue &getOptionValue(unsigned N) const = 0;
// printOptionInfo - Print out information about this option. The
// to-be-maintained width is specified.
//
virtual void printOptionInfo(const Option &O, size_t GlobalWidth) const;
void printGenericOptionDiff(const Option &O, const GenericOptionValue &V,
const GenericOptionValue &Default,
size_t GlobalWidth) const;
// printOptionDiff - print the value of an option and it's default.
//
// Template definition ensures that the option and default have the same
// DataType (via the same AnyOptionValue).
template <class AnyOptionValue>
void printOptionDiff(const Option &O, const AnyOptionValue &V,
const AnyOptionValue &Default,
size_t GlobalWidth) const {
printGenericOptionDiff(O, V, Default, GlobalWidth);
}
void initialize() {}
void getExtraOptionNames(SmallVectorImpl<StringRef> &OptionNames) {
// If there has been no argstr specified, that means that we need to add an
// argument for every possible option. This ensures that our options are
// vectored to us.
if (!Owner.hasArgStr())
for (unsigned i = 0, e = getNumOptions(); i != e; ++i)
OptionNames.push_back(getOption(i));
}
enum ValueExpected getValueExpectedFlagDefault() const {
// If there is an ArgStr specified, then we are of the form:
//
// -opt=O2 or -opt O2 or -optO2
//
// In which case, the value is required. Otherwise if an arg str has not
// been specified, we are of the form:
//
// -O2 or O2 or -la (where -l and -a are separate options)
//
// If this is the case, we cannot allow a value.
//
if (Owner.hasArgStr())
return ValueRequired;
else
return ValueDisallowed;
}
// findOption - Return the option number corresponding to the specified
// argument string. If the option is not found, getNumOptions() is returned.
//
unsigned findOption(StringRef Name);
protected:
Option &Owner;
};
// Default parser implementation - This implementation depends on having a
// mapping of recognized options to values of some sort. In addition to this,
// each entry in the mapping also tracks a help message that is printed with the
// command line option for -help. Because this is a simple mapping parser, the
// data type can be any unsupported type.
//
template <class DataType> class parser : public generic_parser_base {
protected:
class OptionInfo : public GenericOptionInfo {
public:
OptionInfo(StringRef name, DataType v, StringRef helpStr)
: GenericOptionInfo(name, helpStr), V(v) {}
OptionValue<DataType> V;
};
SmallVector<OptionInfo, 8> Values;
public:
parser(Option &O) : generic_parser_base(O) {}
using parser_data_type = DataType;
// Implement virtual functions needed by generic_parser_base
unsigned getNumOptions() const override { return unsigned(Values.size()); }
StringRef getOption(unsigned N) const override { return Values[N].Name; }
StringRef getDescription(unsigned N) const override {
return Values[N].HelpStr;
}
// getOptionValue - Return the value of option name N.
const GenericOptionValue &getOptionValue(unsigned N) const override {
return Values[N].V;
}
// parse - Return true on error.
bool parse(Option &O, StringRef ArgName, StringRef Arg, DataType &V) {
StringRef ArgVal;
if (Owner.hasArgStr())
ArgVal = Arg;
else
ArgVal = ArgName;
for (size_t i = 0, e = Values.size(); i != e; ++i)
if (Values[i].Name == ArgVal) {
V = Values[i].V.getValue();
return false;
}
return O.error("Cannot find option named '" + ArgVal + "'!");
}
/// addLiteralOption - Add an entry to the mapping table.
///
template <class DT>
void addLiteralOption(StringRef Name, const DT &V, StringRef HelpStr) {
assert(findOption(Name) == Values.size() && "Option already exists!");
OptionInfo X(Name, static_cast<DataType>(V), HelpStr);
Values.push_back(X);
AddLiteralOption(Owner, Name);
}
/// removeLiteralOption - Remove the specified option.
///
void removeLiteralOption(StringRef Name) {
unsigned N = findOption(Name);
assert(N != Values.size() && "Option not found!");
Values.erase(Values.begin() + N);
}
};
//--------------------------------------------------
// basic_parser - Super class of parsers to provide boilerplate code
//
class basic_parser_impl { // non-template implementation of basic_parser<t>
public:
basic_parser_impl(Option &) {}
enum ValueExpected getValueExpectedFlagDefault() const {
return ValueRequired;
}
void getExtraOptionNames(SmallVectorImpl<StringRef> &) {}
void initialize() {}
// Return the width of the option tag for printing...
size_t getOptionWidth(const Option &O) const;
// printOptionInfo - Print out information about this option. The
// to-be-maintained width is specified.
//
void printOptionInfo(const Option &O, size_t GlobalWidth) const;
// printOptionNoValue - Print a placeholder for options that don't yet support
// printOptionDiff().
void printOptionNoValue(const Option &O, size_t GlobalWidth) const;
// getValueName - Overload in subclass to provide a better default value.
virtual StringRef getValueName() const { return "value"; }
// An out-of-line virtual method to provide a 'home' for this class.
virtual void anchor();
protected:
~basic_parser_impl() = default;
// A helper for basic_parser::printOptionDiff.
void printOptionName(const Option &O, size_t GlobalWidth) const;
};
// basic_parser - The real basic parser is just a template wrapper that provides
// a typedef for the provided data type.
//
template <class DataType> class basic_parser : public basic_parser_impl {
public:
using parser_data_type = DataType;
using OptVal = OptionValue<DataType>;
basic_parser(Option &O) : basic_parser_impl(O) {}
protected:
~basic_parser() = default;
};
//--------------------------------------------------
// parser<bool>
//
template <> class parser<bool> final : public basic_parser<bool> {
public:
parser(Option &O) : basic_parser(O) {}
// parse - Return true on error.
bool parse(Option &O, StringRef ArgName, StringRef Arg, bool &Val);
void initialize() {}
enum ValueExpected getValueExpectedFlagDefault() const {
return ValueOptional;
}
// getValueName - Do not print =<value> at all.
StringRef getValueName() const override { return StringRef(); }
void printOptionDiff(const Option &O, bool V, OptVal Default,
size_t GlobalWidth) const;
// An out-of-line virtual method to provide a 'home' for this class.
void anchor() override;
};
extern template class basic_parser<bool>;
//--------------------------------------------------
// parser<boolOrDefault>
template <>
class parser<boolOrDefault> final : public basic_parser<boolOrDefault> {
public:
parser(Option &O) : basic_parser(O) {}
// parse - Return true on error.
bool parse(Option &O, StringRef ArgName, StringRef Arg, boolOrDefault &Val);
enum ValueExpected getValueExpectedFlagDefault() const {
return ValueOptional;
}
// getValueName - Do not print =<value> at all.
StringRef getValueName() const override { return StringRef(); }
void printOptionDiff(const Option &O, boolOrDefault V, OptVal Default,
size_t GlobalWidth) const;
// An out-of-line virtual method to provide a 'home' for this class.
void anchor() override;
};
extern template class basic_parser<boolOrDefault>;
//--------------------------------------------------
// parser<int>
//
template <> class parser<int> final : public basic_parser<int> {
public:
parser(Option &O) : basic_parser(O) {}
// parse - Return true on error.
bool parse(Option &O, StringRef ArgName, StringRef Arg, int &Val);
// getValueName - Overload in subclass to provide a better default value.
StringRef getValueName() const override { return "int"; }
void printOptionDiff(const Option &O, int V, OptVal Default,
size_t GlobalWidth) const;
// An out-of-line virtual method to provide a 'home' for this class.
void anchor() override;
};
extern template class basic_parser<int>;
//--------------------------------------------------
// parser<unsigned>
//
template <> class parser<unsigned> final : public basic_parser<unsigned> {
public:
parser(Option &O) : basic_parser(O) {}
// parse - Return true on error.
bool parse(Option &O, StringRef ArgName, StringRef Arg, unsigned &Val);
// getValueName - Overload in subclass to provide a better default value.
StringRef getValueName() const override { return "uint"; }
void printOptionDiff(const Option &O, unsigned V, OptVal Default,
size_t GlobalWidth) const;
// An out-of-line virtual method to provide a 'home' for this class.
void anchor() override;
};
extern template class basic_parser<unsigned>;
//--------------------------------------------------
// parser<unsigned long long>
//
template <>
class parser<unsigned long long> final
: public basic_parser<unsigned long long> {
public:
parser(Option &O) : basic_parser(O) {}
// parse - Return true on error.
bool parse(Option &O, StringRef ArgName, StringRef Arg,
unsigned long long &Val);
// getValueName - Overload in subclass to provide a better default value.
StringRef getValueName() const override { return "uint"; }
void printOptionDiff(const Option &O, unsigned long long V, OptVal Default,
size_t GlobalWidth) const;
// An out-of-line virtual method to provide a 'home' for this class.
void anchor() override;
};
extern template class basic_parser<unsigned long long>;
//--------------------------------------------------
// parser<double>
//
template <> class parser<double> final : public basic_parser<double> {
public:
parser(Option &O) : basic_parser(O) {}
// parse - Return true on error.
bool parse(Option &O, StringRef ArgName, StringRef Arg, double &Val);
// getValueName - Overload in subclass to provide a better default value.
StringRef getValueName() const override { return "number"; }
void printOptionDiff(const Option &O, double V, OptVal Default,
size_t GlobalWidth) const;
// An out-of-line virtual method to provide a 'home' for this class.
void anchor() override;
};
extern template class basic_parser<double>;
//--------------------------------------------------
// parser<float>
//
template <> class parser<float> final : public basic_parser<float> {
public:
parser(Option &O) : basic_parser(O) {}
// parse - Return true on error.
bool parse(Option &O, StringRef ArgName, StringRef Arg, float &Val);
// getValueName - Overload in subclass to provide a better default value.
StringRef getValueName() const override { return "number"; }
void printOptionDiff(const Option &O, float V, OptVal Default,
size_t GlobalWidth) const;
// An out-of-line virtual method to provide a 'home' for this class.
void anchor() override;
};
extern template class basic_parser<float>;
//--------------------------------------------------
// parser<std::string>
//
template <> class parser<std::string> final : public basic_parser<std::string> {
public:
parser(Option &O) : basic_parser(O) {}
// parse - Return true on error.
bool parse(Option &, StringRef, StringRef Arg, std::string &Value) {
Value = Arg.str();
return false;
}
// getValueName - Overload in subclass to provide a better default value.
StringRef getValueName() const override { return "string"; }
void printOptionDiff(const Option &O, StringRef V, const OptVal &Default,
size_t GlobalWidth) const;
// An out-of-line virtual method to provide a 'home' for this class.
void anchor() override;
};
extern template class basic_parser<std::string>;
//--------------------------------------------------
// parser<char>
//
template <> class parser<char> final : public basic_parser<char> {
public:
parser(Option &O) : basic_parser(O) {}
// parse - Return true on error.
bool parse(Option &, StringRef, StringRef Arg, char &Value) {
Value = Arg[0];
return false;
}
// getValueName - Overload in subclass to provide a better default value.
StringRef getValueName() const override { return "char"; }
void printOptionDiff(const Option &O, char V, OptVal Default,
size_t GlobalWidth) const;
// An out-of-line virtual method to provide a 'home' for this class.
void anchor() override;
};
extern template class basic_parser<char>;
//--------------------------------------------------
// PrintOptionDiff
//
// This collection of wrappers is the intermediary between class opt and class
// parser to handle all the template nastiness.
// This overloaded function is selected by the generic parser.
template <class ParserClass, class DT>
void printOptionDiff(const Option &O, const generic_parser_base &P, const DT &V,
const OptionValue<DT> &Default, size_t GlobalWidth) {
OptionValue<DT> OV = V;
P.printOptionDiff(O, OV, Default, GlobalWidth);
}
// This is instantiated for basic parsers when the parsed value has a different
// type than the option value. e.g. HelpPrinter.
template <class ParserDT, class ValDT> struct OptionDiffPrinter {
void print(const Option &O, const parser<ParserDT> &P, const ValDT & /*V*/,
const OptionValue<ValDT> & /*Default*/, size_t GlobalWidth) {
P.printOptionNoValue(O, GlobalWidth);
}
};
// This is instantiated for basic parsers when the parsed value has the same
// type as the option value.
template <class DT> struct OptionDiffPrinter<DT, DT> {
void print(const Option &O, const parser<DT> &P, const DT &V,
const OptionValue<DT> &Default, size_t GlobalWidth) {
P.printOptionDiff(O, V, Default, GlobalWidth);
}
};
// This overloaded function is selected by the basic parser, which may parse a
// different type than the option type.
template <class ParserClass, class ValDT>
void printOptionDiff(
const Option &O,
const basic_parser<typename ParserClass::parser_data_type> &P,
const ValDT &V, const OptionValue<ValDT> &Default, size_t GlobalWidth) {
OptionDiffPrinter<typename ParserClass::parser_data_type, ValDT> printer;
printer.print(O, static_cast<const ParserClass &>(P), V, Default,
GlobalWidth);
}
//===----------------------------------------------------------------------===//
// applicator class - This class is used because we must use partial
// specialization to handle literal string arguments specially (const char* does
// not correctly respond to the apply method). Because the syntax to use this
// is a pain, we have the 'apply' method below to handle the nastiness...
//
template <class Mod> struct applicator {
template <class Opt> static void opt(const Mod &M, Opt &O) { M.apply(O); }
};
// Handle const char* as a special case...
template <unsigned n> struct applicator<char[n]> {
template <class Opt> static void opt(StringRef Str, Opt &O) {
O.setArgStr(Str);
}
};
template <unsigned n> struct applicator<const char[n]> {
template <class Opt> static void opt(StringRef Str, Opt &O) {
O.setArgStr(Str);
}
};
template <> struct applicator<StringRef > {
template <class Opt> static void opt(StringRef Str, Opt &O) {
O.setArgStr(Str);
}
};
template <> struct applicator<NumOccurrencesFlag> {
static void opt(NumOccurrencesFlag N, Option &O) {
O.setNumOccurrencesFlag(N);
}
};
template <> struct applicator<ValueExpected> {
static void opt(ValueExpected VE, Option &O) { O.setValueExpectedFlag(VE); }
};
template <> struct applicator<OptionHidden> {
static void opt(OptionHidden OH, Option &O) { O.setHiddenFlag(OH); }
};
template <> struct applicator<FormattingFlags> {
static void opt(FormattingFlags FF, Option &O) { O.setFormattingFlag(FF); }
};
template <> struct applicator<MiscFlags> {
static void opt(MiscFlags MF, Option &O) { O.setMiscFlag(MF); }
};
// apply method - Apply modifiers to an option in a type safe way.
template <class Opt, class Mod, class... Mods>
void apply(Opt *O, const Mod &M, const Mods &... Ms) {
applicator<Mod>::opt(M, *O);
apply(O, Ms...);
}
template <class Opt, class Mod> void apply(Opt *O, const Mod &M) {
applicator<Mod>::opt(M, *O);
}
//===----------------------------------------------------------------------===//
// opt_storage class
// Default storage class definition: external storage. This implementation
// assumes the user will specify a variable to store the data into with the
// cl::location(x) modifier.
//
template <class DataType, bool ExternalStorage, bool isClass>
class opt_storage {
DataType *Location = nullptr; // Where to store the object...
OptionValue<DataType> Default;
void check_location() const {
assert(Location && "cl::location(...) not specified for a command "
"line option with external storage, "
"or cl::init specified before cl::location()!!");
}
public:
opt_storage() = default;
bool setLocation(Option &O, DataType &L) {
if (Location)
return O.error("cl::location(x) specified more than once!");
Location = &L;
Default = L;
return false;
}
template <class T> void setValue(const T &V, bool initial = false) {
check_location();
*Location = V;
if (initial)
Default = V;
}
DataType &getValue() {
check_location();
return *Location;
}
const DataType &getValue() const {
check_location();
return *Location;
}
operator DataType() const { return this->getValue(); }
const OptionValue<DataType> &getDefault() const { return Default; }
};
// Define how to hold a class type object, such as a string. Since we can
// inherit from a class, we do so. This makes us exactly compatible with the
// object in all cases that it is used.
//
template <class DataType>
class opt_storage<DataType, false, true> : public DataType {
public:
OptionValue<DataType> Default;
template <class T> void setValue(const T &V, bool initial = false) {
DataType::operator=(V);
if (initial)
Default = V;
}
DataType &getValue() { return *this; }
const DataType &getValue() const { return *this; }
const OptionValue<DataType> &getDefault() const { return Default; }
};
// Define a partial specialization to handle things we cannot inherit from. In
// this case, we store an instance through containment, and overload operators
// to get at the value.
//
template <class DataType> class opt_storage<DataType, false, false> {
public:
DataType Value;
OptionValue<DataType> Default;
// Make sure we initialize the value with the default constructor for the
// type.
opt_storage() : Value(DataType()), Default(DataType()) {}
template <class T> void setValue(const T &V, bool initial = false) {
Value = V;
if (initial)
Default = V;
}
DataType &getValue() { return Value; }
DataType getValue() const { return Value; }
const OptionValue<DataType> &getDefault() const { return Default; }
operator DataType() const { return getValue(); }
// If the datatype is a pointer, support -> on it.
DataType operator->() const { return Value; }
};
//===----------------------------------------------------------------------===//
// opt - A scalar command line option.
//
template <class DataType, bool ExternalStorage = false,
class ParserClass = parser<DataType>>
class opt : public Option,
public opt_storage<DataType, ExternalStorage,
std::is_class<DataType>::value> {
ParserClass Parser;
bool handleOccurrence(unsigned pos, StringRef ArgName,
StringRef Arg) override {
typename ParserClass::parser_data_type Val =
typename ParserClass::parser_data_type();
if (Parser.parse(*this, ArgName, Arg, Val))
return true; // Parse error!
this->setValue(Val);
this->setPosition(pos);
return false;
}
enum ValueExpected getValueExpectedFlagDefault() const override {
return Parser.getValueExpectedFlagDefault();
}
void getExtraOptionNames(SmallVectorImpl<StringRef> &OptionNames) override {
return Parser.getExtraOptionNames(OptionNames);
}
// Forward printing stuff to the parser...
size_t getOptionWidth() const override {
return Parser.getOptionWidth(*this);
}
void printOptionInfo(size_t GlobalWidth) const override {
Parser.printOptionInfo(*this, GlobalWidth);
}
void printOptionValue(size_t GlobalWidth, bool Force) const override {
if (Force || this->getDefault().compare(this->getValue())) {
cl::printOptionDiff<ParserClass>(*this, Parser, this->getValue(),
this->getDefault(), GlobalWidth);
}
}
void done() {
addArgument();
Parser.initialize();
}
public:
// Command line options should not be copyable
opt(const opt &) = delete;
opt &operator=(const opt &) = delete;
// setInitialValue - Used by the cl::init modifier...
void setInitialValue(const DataType &V) { this->setValue(V, true); }
ParserClass &getParser() { return Parser; }
template <class T> DataType &operator=(const T &Val) {
this->setValue(Val);
return this->getValue();
}
template <class... Mods>
explicit opt(const Mods &... Ms)
: Option(Optional, NotHidden), Parser(*this) {
apply(this, Ms...);
done();
}
};
extern template class opt<unsigned>;
extern template class opt<int>;
extern template class opt<std::string>;
extern template class opt<char>;
extern template class opt<bool>;
//===----------------------------------------------------------------------===//
// list_storage class
// Default storage class definition: external storage. This implementation
// assumes the user will specify a variable to store the data into with the
// cl::location(x) modifier.
//
template <class DataType, class StorageClass> class list_storage {
StorageClass *Location = nullptr; // Where to store the object...
public:
list_storage() = default;
bool setLocation(Option &O, StorageClass &L) {
if (Location)
return O.error("cl::location(x) specified more than once!");
Location = &L;
return false;
}
template <class T> void addValue(const T &V) {
assert(Location != 0 && "cl::location(...) not specified for a command "
"line option with external storage!");
Location->push_back(V);
}
};
// Define how to hold a class type object, such as a string.
// Originally this code inherited from std::vector. In transitioning to a new
// API for command line options we should change this. The new implementation
// of this list_storage specialization implements the minimum subset of the
// std::vector API required for all the current clients.
//
// FIXME: Reduce this API to a more narrow subset of std::vector
//
template <class DataType> class list_storage<DataType, bool> {
std::vector<DataType> Storage;
public:
using iterator = typename std::vector<DataType>::iterator;
iterator begin() { return Storage.begin(); }
iterator end() { return Storage.end(); }
using const_iterator = typename std::vector<DataType>::const_iterator;
const_iterator begin() const { return Storage.begin(); }
const_iterator end() const { return Storage.end(); }
using size_type = typename std::vector<DataType>::size_type;
size_type size() const { return Storage.size(); }
bool empty() const { return Storage.empty(); }
void push_back(const DataType &value) { Storage.push_back(value); }
void push_back(DataType &&value) { Storage.push_back(value); }
using reference = typename std::vector<DataType>::reference;
using const_reference = typename std::vector<DataType>::const_reference;
reference operator[](size_type pos) { return Storage[pos]; }
const_reference operator[](size_type pos) const { return Storage[pos]; }
iterator erase(const_iterator pos) { return Storage.erase(pos); }
iterator erase(const_iterator first, const_iterator last) {
return Storage.erase(first, last);
}
iterator erase(iterator pos) { return Storage.erase(pos); }
iterator erase(iterator first, iterator last) {
return Storage.erase(first, last);
}
iterator insert(const_iterator pos, const DataType &value) {
return Storage.insert(pos, value);
}
iterator insert(const_iterator pos, DataType &&value) {
return Storage.insert(pos, value);
}
iterator insert(iterator pos, const DataType &value) {
return Storage.insert(pos, value);
}
iterator insert(iterator pos, DataType &&value) {
return Storage.insert(pos, value);
}
reference front() { return Storage.front(); }
const_reference front() const { return Storage.front(); }
operator std::vector<DataType>&() { return Storage; }
operator ArrayRef<DataType>() { return Storage; }
std::vector<DataType> *operator&() { return &Storage; }
const std::vector<DataType> *operator&() const { return &Storage; }
template <class T> void addValue(const T &V) { Storage.push_back(V); }
};
//===----------------------------------------------------------------------===//
// list - A list of command line options.
//
template <class DataType, class StorageClass = bool,
class ParserClass = parser<DataType>>
class list : public Option, public list_storage<DataType, StorageClass> {
std::vector<unsigned> Positions;
ParserClass Parser;
enum ValueExpected getValueExpectedFlagDefault() const override {
return Parser.getValueExpectedFlagDefault();
}
void getExtraOptionNames(SmallVectorImpl<StringRef> &OptionNames) override {
return Parser.getExtraOptionNames(OptionNames);
}
bool handleOccurrence(unsigned pos, StringRef ArgName,
StringRef Arg) override {
typename ParserClass::parser_data_type Val =
typename ParserClass::parser_data_type();
if (Parser.parse(*this, ArgName, Arg, Val))
return true; // Parse Error!
list_storage<DataType, StorageClass>::addValue(Val);
setPosition(pos);
Positions.push_back(pos);
return false;
}
// Forward printing stuff to the parser...
size_t getOptionWidth() const override {
return Parser.getOptionWidth(*this);
}
void printOptionInfo(size_t GlobalWidth) const override {
Parser.printOptionInfo(*this, GlobalWidth);
}
// Unimplemented: list options don't currently store their default value.
void printOptionValue(size_t /*GlobalWidth*/, bool /*Force*/) const override {
}
void done() {
addArgument();
Parser.initialize();
}
public:
// Command line options should not be copyable
list(const list &) = delete;
list &operator=(const list &) = delete;
ParserClass &getParser() { return Parser; }
unsigned getPosition(unsigned optnum) const {
assert(optnum < this->size() && "Invalid option index");
return Positions[optnum];
}
void setNumAdditionalVals(unsigned n) { Option::setNumAdditionalVals(n); }
template <class... Mods>
explicit list(const Mods &... Ms)
: Option(ZeroOrMore, NotHidden), Parser(*this) {
apply(this, Ms...);
done();
}
};
// multi_val - Modifier to set the number of additional values.
struct multi_val {
unsigned AdditionalVals;
explicit multi_val(unsigned N) : AdditionalVals(N) {}
template <typename D, typename S, typename P>
void apply(list<D, S, P> &L) const {
L.setNumAdditionalVals(AdditionalVals);
}
};
//===----------------------------------------------------------------------===//
// bits_storage class
// Default storage class definition: external storage. This implementation
// assumes the user will specify a variable to store the data into with the
// cl::location(x) modifier.
//
template <class DataType, class StorageClass> class bits_storage {
unsigned *Location = nullptr; // Where to store the bits...
template <class T> static unsigned Bit(const T &V) {
unsigned BitPos = reinterpret_cast<unsigned>(V);
assert(BitPos < sizeof(unsigned) * CHAR_BIT &&
"enum exceeds width of bit vector!");
return 1 << BitPos;
}
public:
bits_storage() = default;
bool setLocation(Option &O, unsigned &L) {
if (Location)
return O.error("cl::location(x) specified more than once!");
Location = &L;
return false;
}
template <class T> void addValue(const T &V) {
assert(Location != 0 && "cl::location(...) not specified for a command "
"line option with external storage!");
*Location |= Bit(V);
}
unsigned getBits() { return *Location; }
template <class T> bool isSet(const T &V) {
return (*Location & Bit(V)) != 0;
}
};
// Define how to hold bits. Since we can inherit from a class, we do so.
// This makes us exactly compatible with the bits in all cases that it is used.
//
template <class DataType> class bits_storage<DataType, bool> {
unsigned Bits; // Where to store the bits...
template <class T> static unsigned Bit(const T &V) {
unsigned BitPos = (unsigned)V;
assert(BitPos < sizeof(unsigned) * CHAR_BIT &&
"enum exceeds width of bit vector!");
return 1 << BitPos;
}
public:
template <class T> void addValue(const T &V) { Bits |= Bit(V); }
unsigned getBits() { return Bits; }
template <class T> bool isSet(const T &V) { return (Bits & Bit(V)) != 0; }
};
//===----------------------------------------------------------------------===//
// bits - A bit vector of command options.
//
template <class DataType, class Storage = bool,
class ParserClass = parser<DataType>>
class bits : public Option, public bits_storage<DataType, Storage> {
std::vector<unsigned> Positions;
ParserClass Parser;
enum ValueExpected getValueExpectedFlagDefault() const override {
return Parser.getValueExpectedFlagDefault();
}
void getExtraOptionNames(SmallVectorImpl<StringRef> &OptionNames) override {
return Parser.getExtraOptionNames(OptionNames);
}
bool handleOccurrence(unsigned pos, StringRef ArgName,
StringRef Arg) override {
typename ParserClass::parser_data_type Val =
typename ParserClass::parser_data_type();
if (Parser.parse(*this, ArgName, Arg, Val))
return true; // Parse Error!
this->addValue(Val);
setPosition(pos);
Positions.push_back(pos);
return false;
}
// Forward printing stuff to the parser...
size_t getOptionWidth() const override {
return Parser.getOptionWidth(*this);
}
void printOptionInfo(size_t GlobalWidth) const override {
Parser.printOptionInfo(*this, GlobalWidth);
}
// Unimplemented: bits options don't currently store their default values.
void printOptionValue(size_t /*GlobalWidth*/, bool /*Force*/) const override {
}
void done() {
addArgument();
Parser.initialize();
}
public:
// Command line options should not be copyable
bits(const bits &) = delete;
bits &operator=(const bits &) = delete;
ParserClass &getParser() { return Parser; }
unsigned getPosition(unsigned optnum) const {
assert(optnum < this->size() && "Invalid option index");
return Positions[optnum];
}
template <class... Mods>
explicit bits(const Mods &... Ms)
: Option(ZeroOrMore, NotHidden), Parser(*this) {
apply(this, Ms...);
done();
}
};
//===----------------------------------------------------------------------===//
// Aliased command line option (alias this name to a preexisting name)
//
class alias : public Option {
Option *AliasFor;
bool handleOccurrence(unsigned pos, StringRef /*ArgName*/,
StringRef Arg) override {
return AliasFor->handleOccurrence(pos, AliasFor->ArgStr, Arg);
}
bool addOccurrence(unsigned pos, StringRef /*ArgName*/, StringRef Value,
bool MultiArg = false) override {
return AliasFor->addOccurrence(pos, AliasFor->ArgStr, Value, MultiArg);
}
// Handle printing stuff...
size_t getOptionWidth() const override;
void printOptionInfo(size_t GlobalWidth) const override;
// Aliases do not need to print their values.
void printOptionValue(size_t /*GlobalWidth*/, bool /*Force*/) const override {
}
ValueExpected getValueExpectedFlagDefault() const override {
return AliasFor->getValueExpectedFlag();
}
void done() {
if (!hasArgStr())
error("cl::alias must have argument name specified!");
if (!AliasFor)
error("cl::alias must have an cl::aliasopt(option) specified!");
Subs = AliasFor->Subs;
addArgument();
}
public:
// Command line options should not be copyable
alias(const alias &) = delete;
alias &operator=(const alias &) = delete;
void setAliasFor(Option &O) {
if (AliasFor)
error("cl::alias must only have one cl::aliasopt(...) specified!");
AliasFor = &O;
}
template <class... Mods>
explicit alias(const Mods &... Ms)
: Option(Optional, Hidden), AliasFor(nullptr) {
apply(this, Ms...);
done();
}
};
// aliasfor - Modifier to set the option an alias aliases.
struct aliasopt {
Option &Opt;
explicit aliasopt(Option &O) : Opt(O) {}
void apply(alias &A) const { A.setAliasFor(Opt); }
};
// extrahelp - provide additional help at the end of the normal help
// output. All occurrences of cl::extrahelp will be accumulated and
// printed to stderr at the end of the regular help, just before
// exit is called.
struct extrahelp {
StringRef morehelp;
explicit extrahelp(StringRef help);
};
void PrintVersionMessage();
/// This function just prints the help message, exactly the same way as if the
/// -help or -help-hidden option had been given on the command line.
///
/// NOTE: THIS FUNCTION TERMINATES THE PROGRAM!
///
/// \param Hidden if true will print hidden options
/// \param Categorized if true print options in categories
void PrintHelpMessage(bool Hidden = false, bool Categorized = false);
//===----------------------------------------------------------------------===//
// Public interface for accessing registered options.
//
/// \brief Use this to get a StringMap to all registered named options
/// (e.g. -help). Note \p Map Should be an empty StringMap.
///
/// \return A reference to the StringMap used by the cl APIs to parse options.
///
/// Access to unnamed arguments (i.e. positional) are not provided because
/// it is expected that the client already has access to these.
///
/// Typical usage:
/// \code
/// main(int argc,char* argv[]) {
/// StringMap<llvm::cl::Option*> &opts = llvm::cl::getRegisteredOptions();
/// assert(opts.count("help") == 1)
/// opts["help"]->setDescription("Show alphabetical help information")
/// // More code
/// llvm::cl::ParseCommandLineOptions(argc,argv);
/// //More code
/// }
/// \endcode
///
/// This interface is useful for modifying options in libraries that are out of
/// the control of the client. The options should be modified before calling
/// llvm::cl::ParseCommandLineOptions().
///
/// Hopefully this API can be deprecated soon. Any situation where options need
/// to be modified by tools or libraries should be handled by sane APIs rather
/// than just handing around a global list.
StringMap<Option *> &getRegisteredOptions(SubCommand &Sub = *TopLevelSubCommand);
/// \brief Use this to get all registered SubCommands from the provided parser.
///
/// \return A range of all SubCommand pointers registered with the parser.
///
/// Typical usage:
/// \code
/// main(int argc, char* argv[]) {
/// llvm::cl::ParseCommandLineOptions(argc, argv);
/// for (auto* S : llvm::cl::getRegisteredSubcommands()) {
/// if (*S) {
/// std::cout << "Executing subcommand: " << S->getName() << std::endl;
/// // Execute some function based on the name...
/// }
/// }
/// }
/// \endcode
///
/// This interface is useful for defining subcommands in libraries and
/// the dispatch from a single point (like in the main function).
iterator_range<typename SmallPtrSet<SubCommand *, 4>::iterator>
getRegisteredSubcommands();
//===----------------------------------------------------------------------===//
// Standalone command line processing utilities.
//
/// \brief Tokenizes a command line that can contain escapes and quotes.
//
/// The quoting rules match those used by GCC and other tools that use
/// libiberty's buildargv() or expandargv() utilities, and do not match bash.
/// They differ from buildargv() on treatment of backslashes that do not escape
/// a special character to make it possible to accept most Windows file paths.
///
/// \param [in] Source The string to be split on whitespace with quotes.
/// \param [in] Saver Delegates back to the caller for saving parsed strings.
/// \param [in] MarkEOLs true if tokenizing a response file and you want end of
/// lines and end of the response file to be marked with a nullptr string.
/// \param [out] NewArgv All parsed strings are appended to NewArgv.
void TokenizeGNUCommandLine(StringRef Source, StringSaver &Saver,
SmallVectorImpl<const char *> &NewArgv,
bool MarkEOLs = false);
/// \brief Tokenizes a Windows command line which may contain quotes and escaped
/// quotes.
///
/// See MSDN docs for CommandLineToArgvW for information on the quoting rules.
/// http://msdn.microsoft.com/en-us/library/windows/desktop/17w5ykft(v=vs.85).aspx
///
/// \param [in] Source The string to be split on whitespace with quotes.
/// \param [in] Saver Delegates back to the caller for saving parsed strings.
/// \param [in] MarkEOLs true if tokenizing a response file and you want end of
/// lines and end of the response file to be marked with a nullptr string.
/// \param [out] NewArgv All parsed strings are appended to NewArgv.
void TokenizeWindowsCommandLine(StringRef Source, StringSaver &Saver,
SmallVectorImpl<const char *> &NewArgv,
bool MarkEOLs = false);
/// \brief String tokenization function type. Should be compatible with either
/// Windows or Unix command line tokenizers.
using TokenizerCallback = void (*)(StringRef Source, StringSaver &Saver,
SmallVectorImpl<const char *> &NewArgv,
bool MarkEOLs);
/// \brief Expand response files on a command line recursively using the given
/// StringSaver and tokenization strategy. Argv should contain the command line
/// before expansion and will be modified in place. If requested, Argv will
/// also be populated with nullptrs indicating where each response file line
/// ends, which is useful for the "/link" argument that needs to consume all
/// remaining arguments only until the next end of line, when in a response
/// file.
///
/// \param [in] Saver Delegates back to the caller for saving parsed strings.
/// \param [in] Tokenizer Tokenization strategy. Typically Unix or Windows.
/// \param [in,out] Argv Command line into which to expand response files.
/// \param [in] MarkEOLs Mark end of lines and the end of the response file
/// with nullptrs in the Argv vector.
/// \param [in] RelativeNames true if names of nested response files must be
/// resolved relative to including file.
/// \return true if all @files were expanded successfully or there were none.
bool ExpandResponseFiles(StringSaver &Saver, TokenizerCallback Tokenizer,
SmallVectorImpl<const char *> &Argv,
bool MarkEOLs = false, bool RelativeNames = false);
/// \brief Mark all options not part of this category as cl::ReallyHidden.
///
/// \param Category the category of options to keep displaying
///
/// Some tools (like clang-format) like to be able to hide all options that are
/// not specific to the tool. This function allows a tool to specify a single
/// option category to display in the -help output.
void HideUnrelatedOptions(cl::OptionCategory &Category,
SubCommand &Sub = *TopLevelSubCommand);
/// \brief Mark all options not part of the categories as cl::ReallyHidden.
///
/// \param Categories the categories of options to keep displaying.
///
/// Some tools (like clang-format) like to be able to hide all options that are
/// not specific to the tool. This function allows a tool to specify a single
/// option category to display in the -help output.
void HideUnrelatedOptions(ArrayRef<const cl::OptionCategory *> Categories,
SubCommand &Sub = *TopLevelSubCommand);
/// \brief Reset all command line options to a state that looks as if they have
/// never appeared on the command line. This is useful for being able to parse
/// a command line multiple times (especially useful for writing tests).
void ResetAllOptionOccurrences();
/// \brief Reset the command line parser back to its initial state. This
/// removes
/// all options, categories, and subcommands and returns the parser to a state
/// where no options are supported.
void ResetCommandLineParser();
} // end namespace cl
} // end namespace llvm
#endif // LLVM_SUPPORT_COMMANDLINE_H