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1 # Copyright (C) 2003, 2004, 2007, 2008 Free Software Foundation, Inc.
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2 # Contributed by Kelley Cook, June 2004.
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3 # Original code from Neil Booth, May 2003.
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4 #
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5 # This program is free software; you can redistribute it and/or modify it
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6 # under the terms of the GNU General Public License as published by the
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7 # Free Software Foundation; either version 3, or (at your option) any
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8 # later version.
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9 #
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10 # This program is distributed in the hope that it will be useful,
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11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 # GNU General Public License for more details.
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14 #
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15 # You should have received a copy of the GNU General Public License
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16 # along with this program; see the file COPYING3. If not see
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17 # <http://www.gnu.org/licenses/>.
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18
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19 # Some common subroutines for use by opt[ch]-gen.awk.
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20
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21 # Return nonzero if FLAGS contains a flag matching REGEX.
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22 function flag_set_p(regex, flags)
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23 {
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24 return (" " flags " ") ~ (" " regex " ")
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25 }
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26
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27 # Return STRING if FLAGS contains a flag matching regexp REGEX,
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28 # otherwise return the empty string.
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29 function test_flag(regex, flags, string)
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30 {
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31 if (flag_set_p(regex, flags))
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32 return string
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33 return ""
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34 }
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35
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36 # If FLAGS contains a "NAME(...argument...)" flag, return the value
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37 # of the argument. Return the empty string otherwise.
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38 function opt_args(name, flags)
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39 {
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40 flags = " " flags
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41 if (flags !~ " " name "\\(")
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42 return ""
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43 sub(".* " name "\\(", "", flags)
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44 sub("\\).*", "", flags)
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45
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46 return flags
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47 }
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48
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49 # Return the Nth comma-separated element of S. Return the empty string
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50 # if S does not contain N elements.
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51 function nth_arg(n, s)
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52 {
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53 while (n-- > 0) {
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54 if (s !~ ",")
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55 return ""
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56 sub("[^,]*, *", "", s)
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57 }
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58 sub(",.*", "", s)
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59 return s
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60 }
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61
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62 # Return a bitmask of CL_* values for option flags FLAGS.
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63 function switch_flags (flags)
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64 {
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65 result = "0"
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66 for (j = 0; j < n_langs; j++) {
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67 regex = langs[j]
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68 gsub ( "\\+", "\\+", regex )
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69 result = result test_flag(regex, flags, " | " macros[j])
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70 }
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71 result = result \
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72 test_flag("Common", flags, " | CL_COMMON") \
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73 test_flag("Target", flags, " | CL_TARGET") \
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74 test_flag("Save", flags, " | CL_SAVE") \
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75 test_flag("Joined", flags, " | CL_JOINED") \
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76 test_flag("JoinedOrMissing", flags, " | CL_JOINED | CL_MISSING_OK") \
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77 test_flag("Separate", flags, " | CL_SEPARATE") \
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78 test_flag("RejectNegative", flags, " | CL_REJECT_NEGATIVE") \
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79 test_flag("UInteger", flags, " | CL_UINTEGER") \
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80 test_flag("Undocumented", flags, " | CL_UNDOCUMENTED") \
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81 test_flag("Warning", flags, " | CL_WARNING") \
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82 test_flag("Optimization", flags, " | CL_OPTIMIZATION") \
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83 test_flag("Report", flags, " | CL_REPORT")
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84 sub( "^0 \\| ", "", result )
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85 return result
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86 }
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87
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88 # If FLAGS includes a Var flag, return the name of the variable it specifies.
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89 # Return the empty string otherwise.
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90 function var_name(flags)
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91 {
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92 return nth_arg(0, opt_args("Var", flags))
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93 }
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94
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95 # Return true if the option described by FLAGS has a globally-visible state.
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96 function global_state_p(flags)
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97 {
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98 return (var_name(flags) != "" \
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99 || opt_args("Mask", flags) != "" \
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100 || opt_args("InverseMask", flags) != "")
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101 }
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102
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103 # Return true if the option described by FLAGS must have some state
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104 # associated with it.
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105 function needs_state_p(flags)
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106 {
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107 return flag_set_p("Target", flags)
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108 }
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109
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110 # If FLAGS describes an option that needs a static state variable,
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111 # return the name of that variable, otherwise return "". NAME is
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112 # the name of the option.
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113 function static_var(name, flags)
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114 {
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115 if (global_state_p(flags) || !needs_state_p(flags))
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116 return ""
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117 gsub ("[^A-Za-z0-9]", "_", name)
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118 return "VAR_" name
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119 }
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120
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121 # Return the type of variable that should be associated with the given flags.
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122 function var_type(flags)
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123 {
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124 if (!flag_set_p("Joined.*", flags))
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125 return "int "
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126 else if (flag_set_p("UInteger", flags))
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127 return "int "
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128 else
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129 return "const char *"
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130 }
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131
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132 # Return the type of variable that should be associated with the given flags
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133 # for use within a structure. Simple variables are changed to unsigned char
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134 # type instead of int to save space.
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135 function var_type_struct(flags)
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136 {
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137 if (flag_set_p("UInteger", flags))
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138 return "int "
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139 else if (!flag_set_p("Joined.*", flags)) {
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140 if (flag_set_p(".*Mask.*", flags))
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141 return "int "
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142 else
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143 return "unsigned char "
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144 }
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145 else
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146 return "const char *"
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147 }
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148
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149 # Given that an option has flags FLAGS, return an initializer for the
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150 # "var_cond" and "var_value" fields of its cl_options[] entry.
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151 function var_set(flags)
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152 {
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153 s = nth_arg(1, opt_args("Var", flags))
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154 if (s != "")
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155 return "CLVC_EQUAL, " s
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156 s = opt_args("Mask", flags);
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157 if (s != "") {
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158 vn = var_name(flags);
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159 if (vn)
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160 return "CLVC_BIT_SET, OPTION_MASK_" s
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161 else
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162 return "CLVC_BIT_SET, MASK_" s
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163 }
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164 s = nth_arg(0, opt_args("InverseMask", flags));
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165 if (s != "") {
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166 vn = var_name(flags);
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167 if (vn)
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168 return "CLVC_BIT_CLEAR, OPTION_MASK_" s
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169 else
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170 return "CLVC_BIT_CLEAR, MASK_" s
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171 }
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172 if (var_type(flags) == "const char *")
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173 return "CLVC_STRING, 0"
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174 return "CLVC_BOOLEAN, 0"
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175 }
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176
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177 # Given that an option called NAME has flags FLAGS, return an initializer
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178 # for the "flag_var" field of its cl_options[] entry.
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179 function var_ref(name, flags)
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180 {
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181 name = var_name(flags) static_var(name, flags)
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182 if (name != "")
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183 return "&" name
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184 if (opt_args("Mask", flags) != "")
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185 return "&target_flags"
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186 if (opt_args("InverseMask", flags) != "")
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187 return "&target_flags"
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188 return "0"
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189 }
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