gcc/opt-functions.awk

   1 #  Copyright (C) 2003, 2004, 2007, 2008 Free Software Foundation, Inc.
   2 #  Contributed by Kelley Cook, June 2004.
   3 #  Original code from Neil Booth, May 2003.
   4 #
   5 # This program is free software; you can redistribute it and/or modify it
   6 # under the terms of the GNU General Public License as published by the
   7 # Free Software Foundation; either version 3, or (at your option) any
   8 # later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program; see the file COPYING3.  If not see
  17 # <http://www.gnu.org/licenses/>.
  18
  19 # Some common subroutines for use by opt[ch]-gen.awk.
  20
  21 # Return nonzero if FLAGS contains a flag matching REGEX.
  22 function flag_set_p(regex, flags)
  23 {
  24         return (" " flags " ") ~ (" " regex " ")
  25 }
  26
  27 # Return STRING if FLAGS contains a flag matching regexp REGEX,
  28 # otherwise return the empty string.
  29 function test_flag(regex, flags, string)
  30 {
  31         if (flag_set_p(regex, flags))
  32                 return string
  33         return ""
  34 }
  35
  36 # If FLAGS contains a "NAME(...argument...)" flag, return the value
  37 # of the argument.  Return the empty string otherwise.
  38 function opt_args(name, flags)
  39 {
  40         flags = " " flags
  41         if (flags !~ " " name "\\(")
  42                 return ""
  43         sub(".* " name "\\(", "", flags)
  44         if (flags ~ "^{")
  45         {
  46                 sub ("^{", "", flags)
  47                 sub("}\\).*", "", flags)
  48         }
  49         else
  50                 sub("\\).*", "", flags)
  51
  52         return flags
  53 }
  54
  55 # Return the Nth comma-separated element of S.  Return the empty string
  56 # if S does not contain N elements.
  57 function nth_arg(n, s)
  58 {
  59         while (n-- > 0) {
  60                 if (s !~ ",")
  61                         return ""
  62                 sub("[^,]*, *", "", s)
  63         }
  64         sub(",.*", "", s)
  65         return s
  66 }
  67
  68 # Return a bitmask of CL_* values for option flags FLAGS.
  69 function switch_flags (flags)
  70 {
  71         result = "0"
  72         for (j = 0; j < n_langs; j++) {
  73                 regex = langs[j]
  74                 gsub ( "\\+", "\\+", regex )
  75                 result = result test_flag(regex, flags, " | " macros[j])
  76         }
  77         result = result \
  78           test_flag("Common", flags, " | CL_COMMON") \
  79           test_flag("Target", flags, " | CL_TARGET") \
  80           test_flag("Save", flags, " | CL_SAVE") \
  81           test_flag("Joined", flags, " | CL_JOINED") \
  82           test_flag("JoinedOrMissing", flags, " | CL_JOINED | CL_MISSING_OK") \
  83           test_flag("Separate", flags, " | CL_SEPARATE") \
  84           test_flag("RejectNegative", flags, " | CL_REJECT_NEGATIVE") \
  85           test_flag("UInteger", flags, " | CL_UINTEGER") \
  86           test_flag("Undocumented", flags,  " | CL_UNDOCUMENTED") \
  87           test_flag("Warning", flags,  " | CL_WARNING") \
  88           test_flag("Optimization", flags,  " | CL_OPTIMIZATION") \
  89           test_flag("Report", flags, " | CL_REPORT")
  90         sub( "^0 \\| ", "", result )
  91         return result
  92 }
  93
  94 # If FLAGS includes a Var flag, return the name of the variable it specifies.
  95 # Return the empty string otherwise.
  96 function var_name(flags)
  97 {
  98         return nth_arg(0, opt_args("Var", flags))
  99 }
 100
 101 # Return true if the option described by FLAGS has a globally-visible state.
 102 function global_state_p(flags)
 103 {
 104         return (var_name(flags) != "" \
 105                 || opt_args("Mask", flags) != "" \
 106                 || opt_args("InverseMask", flags) != "")
 107 }
 108
 109 # Return true if the option described by FLAGS must have some state
 110 # associated with it.
 111 function needs_state_p(flags)
 112 {
 113         return flag_set_p("Target", flags)
 114 }
 115
 116 # If FLAGS describes an option that needs a static state variable,
 117 # return the name of that variable, otherwise return "".  NAME is
 118 # the name of the option.
 119 function static_var(name, flags)
 120 {
 121         if (global_state_p(flags) || !needs_state_p(flags))
 122                 return ""
 123         gsub ("[^A-Za-z0-9]", "_", name)
 124         return "VAR_" name
 125 }
 126
 127 # Return the type of variable that should be associated with the given flags.
 128 function var_type(flags)
 129 {
 130         if (!flag_set_p("Joined.*", flags))
 131                 return "int "
 132         else if (flag_set_p("UInteger", flags))
 133                 return "int "
 134         else
 135                 return "const char *"
 136 }
 137
 138 # Return the type of variable that should be associated with the given flags
 139 # for use within a structure.  Simple variables are changed to unsigned char
 140 # type instead of int to save space.
 141 function var_type_struct(flags)
 142 {
 143         if (flag_set_p("UInteger", flags))
 144                 return "int "
 145         else if (!flag_set_p("Joined.*", flags)) {
 146                 if (flag_set_p(".*Mask.*", flags))
 147                         return "int "
 148                 else
 149                         return "unsigned char "
 150         }
 151         else
 152                 return "const char *"
 153 }
 154
 155 # Given that an option has flags FLAGS, return an initializer for the
 156 # "var_cond" and "var_value" fields of its cl_options[] entry.
 157 function var_set(flags)
 158 {
 159         s = nth_arg(1, opt_args("Var", flags))
 160         if (s != "")
 161                 return "CLVC_EQUAL, " s
 162         s = opt_args("Mask", flags);
 163         if (s != "") {
 164                 vn = var_name(flags);
 165                 if (vn)
 166                         return "CLVC_BIT_SET, OPTION_MASK_" s
 167                 else
 168                         return "CLVC_BIT_SET, MASK_" s
 169         }
 170         s = nth_arg(0, opt_args("InverseMask", flags));
 171         if (s != "") {
 172                 vn = var_name(flags);
 173                 if (vn)
 174                         return "CLVC_BIT_CLEAR, OPTION_MASK_" s
 175                 else
 176                         return "CLVC_BIT_CLEAR, MASK_" s
 177         }
 178         if (var_type(flags) == "const char *")
 179                 return "CLVC_STRING, 0"
 180         return "CLVC_BOOLEAN, 0"
 181 }
 182
 183 # Given that an option called NAME has flags FLAGS, return an initializer
 184 # for the "flag_var" field of its cl_options[] entry.
 185 function var_ref(name, flags)
 186 {
 187         name = var_name(flags) static_var(name, flags)
 188         if (name != "")
 189                 return "&" name
 190         if (opt_args("Mask", flags) != "")
 191                 return "&target_flags"
 192         if (opt_args("InverseMask", flags) != "")
 193                 return "&target_flags"
 194         return "0"
 195 }