1 //===--- OptTable.h - Option Table ------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef LLVM_OPTION_OPTTABLE_H
11 #define LLVM_OPTION_OPTTABLE_H
13 #include "llvm/ADT/StringSet.h"
14 #include "llvm/Option/OptSpecifier.h"
24 /// \brief Provide access to the Option info table.
26 /// The OptTable class provides a layer of indirection which allows Option
27 /// instance to be created lazily. In the common case, only a few options will
28 /// be needed at runtime; the OptTable class maintains enough information to
29 /// parse command lines without instantiating Options, while letting other
30 /// parts of the driver still use Option instances where convenient.
33 /// \brief Entry for a single option instance in the option data table.
35 /// A null terminated array of prefix strings to apply to name while
37 const char *const *Prefixes;
45 unsigned short GroupID;
46 unsigned short AliasID;
50 /// \brief The static option information table.
51 const Info *OptionInfos;
52 unsigned NumOptionInfos;
54 unsigned TheInputOptionID;
55 unsigned TheUnknownOptionID;
57 /// The index of the first option which can be parsed (i.e., is not a
58 /// special option like 'input' or 'unknown', and is not an option group).
59 unsigned FirstSearchableIndex;
61 /// The union of all option prefixes. If an argument does not begin with
62 /// one of these, it is an input.
63 StringSet<> PrefixesUnion;
64 std::string PrefixChars;
67 const Info &getInfo(OptSpecifier Opt) const {
68 unsigned id = Opt.getID();
69 assert(id > 0 && id - 1 < getNumOptions() && "Invalid Option ID.");
70 return OptionInfos[id - 1];
74 OptTable(const Info *_OptionInfos, unsigned _NumOptionInfos);
78 /// \brief Return the total number of option classes.
79 unsigned getNumOptions() const { return NumOptionInfos; }
81 /// \brief Get the given Opt's Option instance, lazily creating it
84 /// \return The option, or null for the INVALID option id.
85 const Option getOption(OptSpecifier Opt) const;
87 /// \brief Lookup the name of the given option.
88 const char *getOptionName(OptSpecifier id) const {
89 return getInfo(id).Name;
92 /// \brief Get the kind of the given option.
93 unsigned getOptionKind(OptSpecifier id) const {
94 return getInfo(id).Kind;
97 /// \brief Get the group id for the given option.
98 unsigned getOptionGroupID(OptSpecifier id) const {
99 return getInfo(id).GroupID;
102 /// \brief Should the help for the given option be hidden by default.
103 bool isOptionHelpHidden(OptSpecifier id) const;
105 /// \brief Get the help text to use to describe this option.
106 const char *getOptionHelpText(OptSpecifier id) const {
107 return getInfo(id).HelpText;
110 /// \brief Get the meta-variable name to use when describing
111 /// this options values in the help text.
112 const char *getOptionMetaVar(OptSpecifier id) const {
113 return getInfo(id).MetaVar;
116 /// \brief Parse a single argument; returning the new argument and
119 /// \param [in,out] Index - The current parsing position in the argument
120 /// string list; on return this will be the index of the next argument
123 /// \return The parsed argument, or 0 if the argument is missing values
124 /// (in which case Index still points at the conceptual next argument string
126 Arg *ParseOneArg(const ArgList &Args, unsigned &Index) const;
128 /// \brief Parse an list of arguments into an InputArgList.
130 /// The resulting InputArgList will reference the strings in [\p ArgBegin,
131 /// \p ArgEnd), and their lifetime should extend past that of the returned
134 /// The only error that can occur in this routine is if an argument is
135 /// missing values; in this case \p MissingArgCount will be non-zero.
137 /// \param ArgBegin - The beginning of the argument vector.
138 /// \param ArgEnd - The end of the argument vector.
139 /// \param MissingArgIndex - On error, the index of the option which could
141 /// \param MissingArgCount - On error, the number of missing options.
142 /// \return An InputArgList; on error this will contain all the options
143 /// which could be parsed.
144 InputArgList *ParseArgs(const char* const *ArgBegin,
145 const char* const *ArgEnd,
146 unsigned &MissingArgIndex,
147 unsigned &MissingArgCount) const;
149 /// \brief Render the help text for an option table.
151 /// \param OS - The stream to write the help text to.
152 /// \param Name - The name to use in the usage line.
153 /// \param Title - The title to use in the usage line.
154 /// \param ShowHidden - Whether help-hidden arguments should be shown.
155 void PrintHelp(raw_ostream &OS, const char *Name,
156 const char *Title, bool ShowHidden = false) const;
158 } // end namespace opt
159 } // end namespace llvm