gcc/genconstants.c

   1 /* Generate from machine description:
   2    a series of #define statements, one for each constant named in
   3    a (define_constants ...) pattern.
   4
   5    Copyright (C) 1987, 1991, 1995, 1998, 1999, 2000, 2001, 2003, 2004,
   6    2007, 2010  Free Software Foundation, Inc.
   7
   8 This file is part of GCC.
   9
  10 GCC is free software; you can redistribute it and/or modify
  11 it under the terms of the GNU General Public License as published by
  12 the Free Software Foundation; either version 3, or (at your option)
  13 any later version.
  14
  15 GCC is distributed in the hope that it will be useful,
  16 but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 GNU General Public License for more details.
  19
  20 You should have received a copy of the GNU General Public License
  21 along with GCC; see the file COPYING3.  If not see
  22 <http://www.gnu.org/licenses/>.  */
  23
  24 /* This program does not use gensupport.c because it does not need to
  25    look at insn patterns, only (define_constants), and we want to
  26    minimize dependencies.  */
  27
  28 #include "bconfig.h"
  29 #include "system.h"
  30 #include "coretypes.h"
  31 #include "errors.h"
  32 #include "read-md.h"
  33
  34 /* Called via traverse_md_constants; emit a #define for
  35    the current constant definition.  */
  36
  37 static int
  38 print_md_constant (void **slot, void *info ATTRIBUTE_UNUSED)
  39 {
  40   struct md_constant *def = (struct md_constant *) *slot;
  41
  42   if (!def->parent_enum)
  43     printf ("#define %s %s\n", def->name, def->value);
  44   return 1;
  45 }
  46
  47 /* Called via traverse_enums.  Emit an enum definition for
  48    enum_type *SLOT.  */
  49
  50 static int
  51 print_enum_type (void **slot, void *info ATTRIBUTE_UNUSED)
  52 {
  53   struct enum_type *def;
  54   struct enum_value *value;
  55   char *value_name;
  56
  57   def = (struct enum_type *) *slot;
  58   printf ("\nenum %s {", def->name);
  59   for (value = def->values; value; value = value->next)
  60     {
  61       printf ("\n  %s = %s", value->def->name, value->def->value);
  62       if (value->next)
  63         putc (',', stdout);
  64     }
  65   printf ("\n};\n");
  66
  67   /* Define NUM_<enum>_VALUES to be the largest enum value + 1.  */
  68   value_name = ACONCAT (("num_", def->name, "_values", NULL));
  69   upcase_string (value_name);
  70   printf ("#define %s %d\n", value_name, def->num_values);
  71
  72   /* Declare the array that is generated by genenum.  */
  73   printf ("extern const char *const %s_strings[];\n", def->name);
  74
  75   return 1;
  76 }
  77
  78 int
  79 main (int argc, char **argv)
  80 {
  81   progname = "genconstants";
  82
  83   if (!read_md_files (argc, argv, NULL, NULL))
  84     return (FATAL_EXIT_CODE);
  85
  86   /* Initializing the MD reader has the side effect of loading up
  87      the constants table that we wish to scan.  */
  88
  89   puts ("/* Generated automatically by the program `genconstants'");
  90   puts ("   from the machine description file `md'.  */\n");
  91   puts ("#ifndef GCC_INSN_CONSTANTS_H");
  92   puts ("#define GCC_INSN_CONSTANTS_H\n");
  93
  94   traverse_md_constants (print_md_constant, 0);
  95   traverse_enum_types (print_enum_type, 0);
  96
  97   puts ("\n#endif /* GCC_INSN_CONSTANTS_H */");
  98
  99   if (ferror (stdout) || fflush (stdout) || fclose (stdout))
 100     return FATAL_EXIT_CODE;
 101
 102   return SUCCESS_EXIT_CODE;
 103 }