gcc/genflags.c

   1 /* Generate from machine description:
   2
   3    - some flags HAVE_... saying which simple standard instructions are
   4    available for this machine.
   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 "config.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
  37 char *xmalloc ();
  38 static void fatal ();
  39 void fancy_abort ();
  40
  41 static void
  42 gen_insn (insn)
  43      rtx insn;
  44 {
  45   char *p;
  46
  47   /* Don't mention instructions whose names are the null string.
  48      They are in the machine description just to be recognized.  */
  49   if (strlen (XSTR (insn, 0)) == 0)
  50     return;
  51
  52   printf ("#define HAVE_%s ", XSTR (insn, 0));
  53   if (strlen (XSTR (insn, 2)) == 0)
  54     printf ("1\n");
  55   else
  56     {
  57       /* Write the macro definition, putting \'s at the end of each line,
  58          if more than one.  */
  59       printf ("(");
  60       for (p = XSTR (insn, 2); *p; p++)
  61         {
  62           if (*p == '\n')
  63             printf (" \\\n");
  64           else
  65             printf ("%c", *p);
  66         }
  67       printf (")\n");
  68     }
  69
  70   printf ("extern rtx gen_%s ();\n", XSTR (insn, 0));
  71 }
  72 \f
  73 char *
  74 xmalloc (size)
  75      unsigned size;
  76 {
  77   register char *val = (char *) malloc (size);
  78
  79   if (val == 0)
  80     fatal ("virtual memory exhausted");
  81
  82   return val;
  83 }
  84
  85 char *
  86 xrealloc (ptr, size)
  87      char *ptr;
  88      unsigned size;
  89 {
  90   char *result = (char *) realloc (ptr, size);
  91   if (!result)
  92     fatal ("virtual memory exhausted");
  93   return result;
  94 }
  95
  96 static void
  97 fatal (s, a1, a2)
  98      char *s;
  99 {
 100   fprintf (stderr, "genflags: ");
 101   fprintf (stderr, s, a1, a2);
 102   fprintf (stderr, "\n");
 103   exit (FATAL_EXIT_CODE);
 104 }
 105
 106 /* More 'friendly' abort that prints the line and file.
 107    config.h can #define abort fancy_abort if you like that sort of thing.  */
 108
 109 void
 110 fancy_abort ()
 111 {
 112   fatal ("Internal gcc abort.");
 113 }
 114 \f
 115 int
 116 main (argc, argv)
 117      int argc;
 118      char **argv;
 119 {
 120   rtx desc;
 121   FILE *infile;
 122   extern rtx read_rtx ();
 123   register int c;
 124
 125   obstack_init (rtl_obstack);
 126
 127   if (argc <= 1)
 128     fatal ("No input file name.");
 129
 130   infile = fopen (argv[1], "r");
 131   if (infile == 0)
 132     {
 133       perror (argv[1]);
 134       exit (FATAL_EXIT_CODE);
 135     }
 136
 137   init_rtl ();
 138
 139   printf ("/* Generated automatically by the program `genflags'\n\
 140 from the machine description file `md'.  */\n\n");
 141
 142   /* Read the machine description.  */
 143
 144   while (1)
 145     {
 146       c = read_skip_spaces (infile);
 147       if (c == EOF)
 148         break;
 149       ungetc (c, infile);
 150
 151       desc = read_rtx (infile);
 152       if (GET_CODE (desc) == DEFINE_INSN || GET_CODE (desc) == DEFINE_EXPAND)
 153         gen_insn (desc);
 154     }
 155
 156   fflush (stdout);
 157   exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
 158   /* NOTREACHED */
 159   return 0;
 160 }