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annotate include/llvm/Option/OptTable.h @ 92:8a1cd0ffee6e

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Create prototype declaration automatically if prototype was not found when parsing continuation arguments.
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Fri, 17 Apr 2015 13:54:34 +0900
parents 95c75e76d11b
children afa8332a0e37
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1 //===--- OptTable.h - Option Table ------------------------------*- C++ -*-===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9
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10 #ifndef LLVM_OPTION_OPTTABLE_H
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11 #define LLVM_OPTION_OPTTABLE_H
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12
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13 #include "llvm/ADT/StringSet.h"
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14 #include "llvm/Option/OptSpecifier.h"
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15
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16 namespace llvm {
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17 class raw_ostream;
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18 namespace opt {
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19 class Arg;
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20 class ArgList;
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21 class InputArgList;
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22 class Option;
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23
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24 /// \brief Provide access to the Option info table.
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25 ///
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26 /// The OptTable class provides a layer of indirection which allows Option
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27 /// instance to be created lazily. In the common case, only a few options will
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28 /// be needed at runtime; the OptTable class maintains enough information to
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29 /// parse command lines without instantiating Options, while letting other
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30 /// parts of the driver still use Option instances where convenient.
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31 class OptTable {
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32 public:
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33 /// \brief Entry for a single option instance in the option data table.
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34 struct Info {
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35 /// A null terminated array of prefix strings to apply to name while
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36 /// matching.
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37 const char *const *Prefixes;
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38 const char *Name;
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39 const char *HelpText;
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40 const char *MetaVar;
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41 unsigned ID;
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42 unsigned char Kind;
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43 unsigned char Param;
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44 unsigned short Flags;
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45 unsigned short GroupID;
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46 unsigned short AliasID;
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47 const char *AliasArgs;
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48 };
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49
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50 private:
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51 /// \brief The static option information table.
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52 const Info *OptionInfos;
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53 unsigned NumOptionInfos;
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54 bool IgnoreCase;
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55
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56 unsigned TheInputOptionID;
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57 unsigned TheUnknownOptionID;
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58
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59 /// The index of the first option which can be parsed (i.e., is not a
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60 /// special option like 'input' or 'unknown', and is not an option group).
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61 unsigned FirstSearchableIndex;
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62
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63 /// The union of all option prefixes. If an argument does not begin with
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64 /// one of these, it is an input.
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65 StringSet<> PrefixesUnion;
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66 std::string PrefixChars;
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67
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68 private:
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69 const Info &getInfo(OptSpecifier Opt) const {
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70 unsigned id = Opt.getID();
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71 assert(id > 0 && id - 1 < getNumOptions() && "Invalid Option ID.");
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72 return OptionInfos[id - 1];
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73 }
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74
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75 protected:
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76 OptTable(const Info *_OptionInfos, unsigned _NumOptionInfos,
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77 bool _IgnoreCase = false);
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78 public:
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79 ~OptTable();
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80
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81 /// \brief Return the total number of option classes.
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82 unsigned getNumOptions() const { return NumOptionInfos; }
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83
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84 /// \brief Get the given Opt's Option instance, lazily creating it
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85 /// if necessary.
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86 ///
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87 /// \return The option, or null for the INVALID option id.
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88 const Option getOption(OptSpecifier Opt) const;
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89
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90 /// \brief Lookup the name of the given option.
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91 const char *getOptionName(OptSpecifier id) const {
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92 return getInfo(id).Name;
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93 }
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94
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95 /// \brief Get the kind of the given option.
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96 unsigned getOptionKind(OptSpecifier id) const {
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97 return getInfo(id).Kind;
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98 }
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99
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100 /// \brief Get the group id for the given option.
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101 unsigned getOptionGroupID(OptSpecifier id) const {
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102 return getInfo(id).GroupID;
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103 }
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104
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105 /// \brief Get the help text to use to describe this option.
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106 const char *getOptionHelpText(OptSpecifier id) const {
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107 return getInfo(id).HelpText;
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108 }
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109
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110 /// \brief Get the meta-variable name to use when describing
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111 /// this options values in the help text.
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112 const char *getOptionMetaVar(OptSpecifier id) const {
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113 return getInfo(id).MetaVar;
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114 }
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115
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116 /// \brief Parse a single argument; returning the new argument and
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117 /// updating Index.
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118 ///
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119 /// \param [in,out] Index - The current parsing position in the argument
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120 /// string list; on return this will be the index of the next argument
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121 /// string to parse.
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122 /// \param [in] FlagsToInclude - Only parse options with any of these flags.
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123 /// Zero is the default which includes all flags.
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124 /// \param [in] FlagsToExclude - Don't parse options with this flag. Zero
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125 /// is the default and means exclude nothing.
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126 ///
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127 /// \return The parsed argument, or 0 if the argument is missing values
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128 /// (in which case Index still points at the conceptual next argument string
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129 /// to parse).
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130 Arg *ParseOneArg(const ArgList &Args, unsigned &Index,
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131 unsigned FlagsToInclude = 0,
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132 unsigned FlagsToExclude = 0) const;
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133
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134 /// \brief Parse an list of arguments into an InputArgList.
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135 ///
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136 /// The resulting InputArgList will reference the strings in [\p ArgBegin,
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137 /// \p ArgEnd), and their lifetime should extend past that of the returned
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138 /// InputArgList.
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139 ///
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140 /// The only error that can occur in this routine is if an argument is
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141 /// missing values; in this case \p MissingArgCount will be non-zero.
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142 ///
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143 /// \param ArgBegin - The beginning of the argument vector.
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144 /// \param ArgEnd - The end of the argument vector.
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145 /// \param MissingArgIndex - On error, the index of the option which could
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146 /// not be parsed.
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147 /// \param MissingArgCount - On error, the number of missing options.
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148 /// \param FlagsToInclude - Only parse options with any of these flags.
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149 /// Zero is the default which includes all flags.
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150 /// \param FlagsToExclude - Don't parse options with this flag. Zero
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151 /// is the default and means exclude nothing.
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152 /// \return An InputArgList; on error this will contain all the options
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153 /// which could be parsed.
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154 InputArgList *ParseArgs(const char* const *ArgBegin,
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155 const char* const *ArgEnd,
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156 unsigned &MissingArgIndex,
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157 unsigned &MissingArgCount,
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158 unsigned FlagsToInclude = 0,
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159 unsigned FlagsToExclude = 0) const;
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160
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161 /// \brief Render the help text for an option table.
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162 ///
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163 /// \param OS - The stream to write the help text to.
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164 /// \param Name - The name to use in the usage line.
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165 /// \param Title - The title to use in the usage line.
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166 /// \param FlagsToInclude - If non-zero, only include options with any
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167 /// of these flags set.
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168 /// \param FlagsToExclude - Exclude options with any of these flags set.
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169 void PrintHelp(raw_ostream &OS, const char *Name,
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170 const char *Title, unsigned FlagsToInclude,
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171 unsigned FlagsToExclude) const;
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172
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173 void PrintHelp(raw_ostream &OS, const char *Name,
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174 const char *Title, bool ShowHidden = false) const;
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175 };
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176 } // end namespace opt
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177 } // end namespace llvm
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178
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179 #endif