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//===--- OptTable.h - Option Table ------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef CLANG_DRIVER_OPTTABLE_H
#define CLANG_DRIVER_OPTTABLE_H
#include "clang/Basic/LLVM.h"
#include "clang/Driver/OptSpecifier.h"
namespace clang {
namespace driver {
class Arg;
class ArgList;
class InputArgList;
class Option;
/// \brief Provide access to the Option info table.
///
/// The OptTable class provides a layer of indirection which allows Option
/// instance to be created lazily. In the common case, only a few options will
/// be needed at runtime; the OptTable class maintains enough information to
/// parse command lines without instantiating Options, while letting other
/// parts of the driver still use Option instances where convenient.
class OptTable {
public:
/// \brief Entry for a single option instance in the option data table.
struct Info {
const char *Name;
const char *HelpText;
const char *MetaVar;
unsigned ID;
unsigned char Kind;
unsigned char Param;
unsigned short Flags;
unsigned short GroupID;
unsigned short AliasID;
};
private:
/// \brief The static option information table.
const Info *OptionInfos;
unsigned NumOptionInfos;
unsigned TheInputOptionID;
unsigned TheUnknownOptionID;
/// The index of the first option which can be parsed (i.e., is not a
/// special option like 'input' or 'unknown', and is not an option group).
unsigned FirstSearchableIndex;
private:
const Info &getInfo(OptSpecifier Opt) const {
unsigned id = Opt.getID();
assert(id > 0 && id - 1 < getNumOptions() && "Invalid Option ID.");
return OptionInfos[id - 1];
}
protected:
OptTable(const Info *_OptionInfos, unsigned _NumOptionInfos);
public:
~OptTable();
/// \brief Return the total number of option classes.
unsigned getNumOptions() const { return NumOptionInfos; }
/// \brief Get the given Opt's Option instance, lazily creating it
/// if necessary.
///
/// \return The option, or null for the INVALID option id.
const Option getOption(OptSpecifier Opt) const;
/// \brief Lookup the name of the given option.
const char *getOptionName(OptSpecifier id) const {
return getInfo(id).Name;
}
/// \brief Get the kind of the given option.
unsigned getOptionKind(OptSpecifier id) const {
return getInfo(id).Kind;
}
/// \brief Get the group id for the given option.
unsigned getOptionGroupID(OptSpecifier id) const {
return getInfo(id).GroupID;
}
/// \brief Should the help for the given option be hidden by default.
bool isOptionHelpHidden(OptSpecifier id) const;
/// \brief Get the help text to use to describe this option.
const char *getOptionHelpText(OptSpecifier id) const {
return getInfo(id).HelpText;
}
/// \brief Get the meta-variable name to use when describing
/// this options values in the help text.
const char *getOptionMetaVar(OptSpecifier id) const {
return getInfo(id).MetaVar;
}
/// \brief Parse a single argument; returning the new argument and
/// updating Index.
///
/// \param [in,out] Index - The current parsing position in the argument
/// string list; on return this will be the index of the next argument
/// string to parse.
///
/// \return The parsed argument, or 0 if the argument is missing values
/// (in which case Index still points at the conceptual next argument string
/// to parse).
Arg *ParseOneArg(const ArgList &Args, unsigned &Index) const;
/// \brief Parse an list of arguments into an InputArgList.
///
/// The resulting InputArgList will reference the strings in [\p ArgBegin,
/// \p ArgEnd), and their lifetime should extend past that of the returned
/// InputArgList.
///
/// The only error that can occur in this routine is if an argument is
/// missing values; in this case \p MissingArgCount will be non-zero.
///
/// \param ArgBegin - The beginning of the argument vector.
/// \param ArgEnd - The end of the argument vector.
/// \param MissingArgIndex - On error, the index of the option which could
/// not be parsed.
/// \param MissingArgCount - On error, the number of missing options.
/// \return An InputArgList; on error this will contain all the options
/// which could be parsed.
InputArgList *ParseArgs(const char* const *ArgBegin,
const char* const *ArgEnd,
unsigned &MissingArgIndex,
unsigned &MissingArgCount) const;
/// \brief Render the help text for an option table.
///
/// \param OS - The stream to write the help text to.
/// \param Name - The name to use in the usage line.
/// \param Title - The title to use in the usage line.
/// \param ShowHidden - Whether help-hidden arguments should be shown.
void PrintHelp(raw_ostream &OS, const char *Name,
const char *Title, bool ShowHidden = false) const;
};
}
}
#endif
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