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,
   6    1999, 2000, 2001 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 2, 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 COPYING.  If not, write to
  22 the Free Software Foundation, 59 Temple Place - Suite 330,
  23 Boston, MA 02111-1307, USA.  */
  24
  25 /* This program does not use gensupport.c because it does not need to
  26    look at insn patterns, only (define_constants), and we want to
  27    minimize dependencies.  */
  28
  29 #include "hconfig.h"
  30 #include "system.h"
  31 #include "rtl.h"
  32 #include "errors.h"
  33 #include "gensupport.h"
  34
  35 static int print_md_constant PARAMS ((void **, void *));
  36 extern int main PARAMS ((int, char **));
  37
  38 /* Called via traverse_md_constants; emit a #define for
  39    the current constant definition.  */
  40
  41 static int
  42 print_md_constant (slot, info)
  43      void **slot;
  44      void *info;
  45 {
  46   struct md_constant *def = *slot;
  47   FILE *file = info;
  48
  49   fprintf (file, "#define %s %s\n", def->name, def->value);
  50   return 1;
  51 }
  52
  53 int
  54 main (argc, argv)
  55      int argc;
  56      char **argv;
  57 {
  58   int dummy1, dummy2;
  59   rtx desc;
  60
  61   progname = "genconstants";
  62
  63   if (argc <= 1)
  64     fatal ("no input file name");
  65
  66   if (init_md_reader (argv[1]) != SUCCESS_EXIT_CODE)
  67     return (FATAL_EXIT_CODE);
  68
  69   /* Scan and discard the entire file.  This has the side effect
  70      of loading up the constants table that we wish to scan.  */
  71   do
  72     desc = read_md_rtx (&dummy1, &dummy2);
  73   while (desc);
  74
  75   puts ("/* Generated automatically by the program `genconstants'");
  76   puts ("   from the machine description file `md'.  */\n");
  77   puts ("#ifndef GCC_INSN_CONSTANTS_H");
  78   puts ("#define GCC_INSN_CONSTANTS_H\n");
  79
  80   traverse_md_constants (print_md_constant, stdout);
  81
  82   puts ("\n#endif /* GCC_INSN_CONSTANTS_H */");
  83
  84   if (ferror (stdout) || fflush (stdout) || fclose (stdout))
  85     return FATAL_EXIT_CODE;
  86
  87   return SUCCESS_EXIT_CODE;
  88 }
  89