gcc/gencodes.c

   1 /* Generate from machine description:
   2
   3    - some macros CODE_FOR_... giving the insn_code_number value
   4    for each of the defined standard insn names.
   5    Copyright (C) 1987, 1991, 1995 Free Software Foundation, Inc.
   6
   7 This file is part of GNU CC.
   8
   9 GNU CC is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 2, or (at your option)
  12 any later version.
  13
  14 GNU CC is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GNU CC; see the file COPYING.  If not, write to
  21 the Free Software Foundation, 59 Temple Place - Suite 330,
  22 Boston, MA 02111-1307, USA.  */
  23
  24
  25 #include <stdio.h>
  26 #include "hconfig.h"
  27 #include "rtl.h"
  28 #include "obstack.h"
  29
  30 static struct obstack obstack;
  31 struct obstack *rtl_obstack = &obstack;
  32
  33 #define obstack_chunk_alloc xmalloc
  34 #define obstack_chunk_free free
  35
  36 extern void free ();
  37 extern rtx read_rtx ();
  38
  39 char *xmalloc ();
  40 static void fatal ();
  41 void fancy_abort ();
  42
  43 static int insn_code_number;
  44
  45 static void
  46 gen_insn (insn)
  47      rtx insn;
  48 {
  49   /* Don't mention instructions whose names are the null string
  50      or begin with '*'.  They are in the machine description just
  51      to be recognized.  */
  52   if (XSTR (insn, 0)[0] != 0 && XSTR (insn, 0)[0] != '*')
  53     printf ("  CODE_FOR_%s = %d,\n", XSTR (insn, 0),
  54             insn_code_number);
  55 }
  56
  57 char *
  58 xmalloc (size)
  59      unsigned size;
  60 {
  61   register char *val = (char *) malloc (size);
  62
  63   if (val == 0)
  64     fatal ("virtual memory exhausted");
  65   return val;
  66 }
  67
  68 char *
  69 xrealloc (ptr, size)
  70      char *ptr;
  71      unsigned size;
  72 {
  73   char *result = (char *) realloc (ptr, size);
  74   if (!result)
  75     fatal ("virtual memory exhausted");
  76   return result;
  77 }
  78
  79 static void
  80 fatal (s, a1, a2)
  81      char *s;
  82 {
  83   fprintf (stderr, "gencodes: ");
  84   fprintf (stderr, s, a1, a2);
  85   fprintf (stderr, "\n");
  86   exit (FATAL_EXIT_CODE);
  87 }
  88
  89 /* More 'friendly' abort that prints the line and file.
  90    config.h can #define abort fancy_abort if you like that sort of thing.  */
  91
  92 void
  93 fancy_abort ()
  94 {
  95   fatal ("Internal gcc abort.");
  96 }
  97 \f
  98 int
  99 main (argc, argv)
 100      int argc;
 101      char **argv;
 102 {
 103   rtx desc;
 104   FILE *infile;
 105   register int c;
 106
 107   obstack_init (rtl_obstack);
 108
 109   if (argc <= 1)
 110     fatal ("No input file name.");
 111
 112   infile = fopen (argv[1], "r");
 113   if (infile == 0)
 114     {
 115       perror (argv[1]);
 116       exit (FATAL_EXIT_CODE);
 117     }
 118
 119   init_rtl ();
 120
 121   printf ("/* Generated automatically by the program `gencodes'\n\
 122 from the machine description file `md'.  */\n\n");
 123
 124   printf ("#ifndef MAX_INSN_CODE\n\n");
 125
 126   /* Read the machine description.  */
 127
 128   insn_code_number = 0;
 129   printf ("enum insn_code {\n");
 130
 131   while (1)
 132     {
 133       c = read_skip_spaces (infile);
 134       if (c == EOF)
 135         break;
 136       ungetc (c, infile);
 137
 138       desc = read_rtx (infile);
 139       if (GET_CODE (desc) == DEFINE_INSN || GET_CODE (desc) == DEFINE_EXPAND)
 140         {
 141           gen_insn (desc);
 142           insn_code_number++;
 143         }
 144       if (GET_CODE (desc) == DEFINE_PEEPHOLE
 145           || GET_CODE (desc) == DEFINE_SPLIT)
 146         {
 147           insn_code_number++;
 148         }
 149     }
 150
 151   printf ("  CODE_FOR_nothing };\n");
 152
 153   printf ("\n#define MAX_INSN_CODE ((int) CODE_FOR_nothing)\n");
 154
 155   printf ("#endif /* MAX_INSN_CODE */\n");
 156
 157   fflush (stdout);
 158   exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
 159   /* NOTREACHED */
 160   return 0;
 161 }