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, 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      or begin with '*'.  They are in the machine description just
  50      to be recognized.  */
  51   if (XSTR (insn, 0)[0] != 0 && XSTR (insn, 0)[0] != '*')
  52     printf ("  CODE_FOR_%s = %d,\n", XSTR (insn, 0),
  53             insn_code_number);
  54 }
  55
  56 char *
  57 xmalloc (size)
  58      unsigned size;
  59 {
  60   register char *val = (char *) malloc (size);
  61
  62   if (val == 0)
  63     fatal ("virtual memory exhausted");
  64   return val;
  65 }
  66
  67 char *
  68 xrealloc (ptr, size)
  69      char *ptr;
  70      unsigned size;
  71 {
  72   char *result = (char *) realloc (ptr, size);
  73   if (!result)
  74     fatal ("virtual memory exhausted");
  75   return result;
  76 }
  77
  78 static void
  79 fatal (s, a1, a2)
  80      char *s;
  81 {
  82   fprintf (stderr, "gencodes: ");
  83   fprintf (stderr, s, a1, a2);
  84   fprintf (stderr, "\n");
  85   exit (FATAL_EXIT_CODE);
  86 }
  87
  88 /* More 'friendly' abort that prints the line and file.
  89    config.h can #define abort fancy_abort if you like that sort of thing.  */
  90
  91 void
  92 fancy_abort ()
  93 {
  94   fatal ("Internal gcc abort.");
  95 }
  96 \f
  97 int
  98 main (argc, argv)
  99      int argc;
 100      char **argv;
 101 {
 102   rtx desc;
 103   FILE *infile;
 104   register int c;
 105
 106   obstack_init (rtl_obstack);
 107
 108   if (argc <= 1)
 109     fatal ("No input file name.");
 110
 111   infile = fopen (argv[1], "r");
 112   if (infile == 0)
 113     {
 114       perror (argv[1]);
 115       exit (FATAL_EXIT_CODE);
 116     }
 117
 118   init_rtl ();
 119
 120   printf ("/* Generated automatically by the program `gencodes'\n\
 121 from the machine description file `md'.  */\n\n");
 122
 123   printf ("#ifndef MAX_INSN_CODE\n\n");
 124
 125   /* Read the machine description.  */
 126
 127   insn_code_number = 0;
 128   printf ("enum insn_code {\n");
 129
 130   while (1)
 131     {
 132       c = read_skip_spaces (infile);
 133       if (c == EOF)
 134         break;
 135       ungetc (c, infile);
 136
 137       desc = read_rtx (infile);
 138       if (GET_CODE (desc) == DEFINE_INSN || GET_CODE (desc) == DEFINE_EXPAND)
 139         {
 140           gen_insn (desc);
 141           insn_code_number++;
 142         }
 143       if (GET_CODE (desc) == DEFINE_PEEPHOLE
 144           || GET_CODE (desc) == DEFINE_SPLIT)
 145         {
 146           insn_code_number++;
 147         }
 148     }
 149
 150   printf ("  CODE_FOR_nothing };\n");
 151
 152   printf ("\n#define MAX_INSN_CODE ((int) CODE_FOR_nothing)\n");
 153
 154   printf ("#endif /* MAX_INSN_CODE */\n");
 155
 156   fflush (stdout);
 157   exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
 158   /* NOTREACHED */
 159   return 0;
 160 }