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 "bconfig.h"
  30 #include "system.h"
  31 #include "coretypes.h"
  32 #include "tm.h"
  33 #include "rtl.h"
  34 #include "errors.h"
  35 #include "gensupport.h"
  36
  37 static int print_md_constant PARAMS ((void **, void *));
  38 extern int main PARAMS ((int, char **));
  39
  40 /* Called via traverse_md_constants; emit a #define for
  41    the current constant definition.  */
  42
  43 static int
  44 print_md_constant (slot, info)
  45      void **slot;
  46      void *info;
  47 {
  48   struct md_constant *def = *slot;
  49   FILE *file = info;
  50
  51   fprintf (file, "#define %s %s\n", def->name, def->value);
  52   return 1;
  53 }
  54
  55 int
  56 main (argc, argv)
  57      int argc;
  58      char **argv;
  59 {
  60   int dummy1, dummy2;
  61   rtx desc;
  62
  63   progname = "genconstants";
  64
  65   if (argc <= 1)
  66     fatal ("no input file name");
  67
  68   if (init_md_reader (argv[1]) != SUCCESS_EXIT_CODE)
  69     return (FATAL_EXIT_CODE);
  70
  71   /* Scan and discard the entire file.  This has the side effect
  72      of loading up the constants table that we wish to scan.  */
  73   do
  74     desc = read_md_rtx (&dummy1, &dummy2);
  75   while (desc);
  76
  77   puts ("/* Generated automatically by the program `genconstants'");
  78   puts ("   from the machine description file `md'.  */\n");
  79   puts ("#ifndef GCC_INSN_CONSTANTS_H");
  80   puts ("#define GCC_INSN_CONSTANTS_H\n");
  81
  82   traverse_md_constants (print_md_constant, stdout);
  83
  84   puts ("\n#endif /* GCC_INSN_CONSTANTS_H */");
  85
  86   if (ferror (stdout) || fflush (stdout) || fclose (stdout))
  87     return FATAL_EXIT_CODE;
  88
  89   return SUCCESS_EXIT_CODE;
  90 }
  91