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 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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  22
  23
  24 #include <stdio.h>
  25 #include "hconfig.h"
  26 #include "rtl.h"
  27 #include "obstack.h"
  28
  29 static struct obstack obstack;
  30 struct obstack *rtl_obstack = &obstack;
  31
  32 #define obstack_chunk_alloc xmalloc
  33 #define obstack_chunk_free free
  34
  35 extern void free ();
  36 extern rtx read_rtx ();
  37
  38 char *xmalloc ();
  39 static void fatal ();
  40 void fancy_abort ();
  41
  42 static int insn_code_number;
  43
  44 static void
  45 gen_insn (insn)
  46      rtx insn;
  47 {
  48   /* Don't mention instructions whose names are the null string.
  49      They are in the machine description just to be recognized.  */
  50   if (strlen (XSTR (insn, 0)) != 0)
  51     printf ("  CODE_FOR_%s = %d,\n", XSTR (insn, 0),
  52             insn_code_number);
  53 }
  54
  55 char *
  56 xmalloc (size)
  57      unsigned size;
  58 {
  59   register char *val = (char *) malloc (size);
  60
  61   if (val == 0)
  62     fatal ("virtual memory exhausted");
  63   return val;
  64 }
  65
  66 char *
  67 xrealloc (ptr, size)
  68      char *ptr;
  69      unsigned size;
  70 {
  71   char *result = (char *) realloc (ptr, size);
  72   if (!result)
  73     fatal ("virtual memory exhausted");
  74   return result;
  75 }
  76
  77 static void
  78 fatal (s, a1, a2)
  79      char *s;
  80 {
  81   fprintf (stderr, "gencodes: ");
  82   fprintf (stderr, s, a1, a2);
  83   fprintf (stderr, "\n");
  84   exit (FATAL_EXIT_CODE);
  85 }
  86
  87 /* More 'friendly' abort that prints the line and file.
  88    config.h can #define abort fancy_abort if you like that sort of thing.  */
  89
  90 void
  91 fancy_abort ()
  92 {
  93   fatal ("Internal gcc abort.");
  94 }
  95 \f
  96 int
  97 main (argc, argv)
  98      int argc;
  99      char **argv;
 100 {
 101   rtx desc;
 102   FILE *infile;
 103   register int c;
 104
 105   obstack_init (rtl_obstack);
 106
 107   if (argc <= 1)
 108     fatal ("No input file name.");
 109
 110   infile = fopen (argv[1], "r");
 111   if (infile == 0)
 112     {
 113       perror (argv[1]);
 114       exit (FATAL_EXIT_CODE);
 115     }
 116
 117   init_rtl ();
 118
 119   printf ("/* Generated automatically by the program `gencodes'\n\
 120 from the machine description file `md'.  */\n\n");
 121
 122   printf ("#ifndef MAX_INSN_CODE\n\n");
 123
 124   /* Read the machine description.  */
 125
 126   insn_code_number = 0;
 127   printf ("enum insn_code {\n");
 128
 129   while (1)
 130     {
 131       c = read_skip_spaces (infile);
 132       if (c == EOF)
 133         break;
 134       ungetc (c, infile);
 135
 136       desc = read_rtx (infile);
 137       if (GET_CODE (desc) == DEFINE_INSN || GET_CODE (desc) == DEFINE_EXPAND)
 138         {
 139           gen_insn (desc);
 140           insn_code_number++;
 141         }
 142       if (GET_CODE (desc) == DEFINE_PEEPHOLE
 143           || GET_CODE (desc) == DEFINE_SPLIT)
 144         {
 145           insn_code_number++;
 146         }
 147     }
 148
 149   printf ("  CODE_FOR_nothing };\n");
 150
 151   printf ("\n#define MAX_INSN_CODE ((int) CODE_FOR_nothing)\n");
 152
 153   printf ("#endif /* MAX_INSN_CODE */\n");
 154
 155   fflush (stdout);
 156   exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
 157   /* NOTREACHED */
 158   return 0;
 159 }