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, 1995, 1998, 1999 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 "hconfig.h"
  26 #include "system.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 void fatal PVPROTO ((const char *, ...))
  37   ATTRIBUTE_PRINTF_1 ATTRIBUTE_NORETURN;
  38 void fancy_abort PROTO((void)) ATTRIBUTE_NORETURN;
  39
  40 /* Names for patterns.  Need to allow linking with print-rtl.  */
  41 char **insn_name_ptr;
  42
  43 /* Obstacks to remember normal, and call insns.  */
  44 static struct obstack call_obstack, normal_obstack;
  45
  46 /* Max size of names encountered.  */
  47 static int max_id_len;
  48
  49 static int num_operands PROTO((rtx));
  50 static void gen_proto PROTO((rtx));
  51 static void gen_nonproto PROTO((rtx));
  52 static void gen_insn PROTO((rtx));
  53
  54
  55 /* Count the number of match_operand's found.  */
  56
  57 static int
  58 num_operands (x)
  59      rtx x;
  60 {
  61   int count = 0;
  62   int i, j;
  63   enum rtx_code code = GET_CODE (x);
  64   char *format_ptr = GET_RTX_FORMAT (code);
  65
  66   if (code == MATCH_OPERAND)
  67     return 1;
  68
  69   if (code == MATCH_OPERATOR || code == MATCH_PARALLEL)
  70     count++;
  71
  72   for (i = 0; i < GET_RTX_LENGTH (code); i++)
  73     {
  74       switch (*format_ptr++)
  75         {
  76         case 'u':
  77         case 'e':
  78           count += num_operands (XEXP (x, i));
  79           break;
  80
  81         case 'E':
  82           if (XVEC (x, i) != NULL)
  83             for (j = 0; j < XVECLEN (x, i); j++)
  84               count += num_operands (XVECEXP (x, i, j));
  85
  86           break;
  87         }
  88     }
  89
  90   return count;
  91 }
  92
  93 /* Print out prototype information for a function.  */
  94
  95 static void
  96 gen_proto (insn)
  97      rtx insn;
  98 {
  99   int num = num_operands (insn);
 100   printf ("extern rtx gen_%-*s PROTO((", max_id_len, XSTR (insn, 0));
 101
 102   if (num == 0)
 103     printf ("void");
 104   else
 105     {
 106       while (num-- > 1)
 107         printf ("rtx, ");
 108
 109       printf ("rtx");
 110     }
 111
 112   printf ("));\n");
 113 }
 114
 115 /* Print out a function declaration without a prototype.  */
 116
 117 static void
 118 gen_nonproto (insn)
 119      rtx insn;
 120 {
 121   printf ("extern rtx gen_%s ();\n", XSTR (insn, 0));
 122 }
 123
 124 static void
 125 gen_insn (insn)
 126      rtx insn;
 127 {
 128   char *name = XSTR (insn, 0);
 129   char *p;
 130   struct obstack *obstack_ptr;
 131   int len;
 132
 133   /* Don't mention instructions whose names are the null string
 134      or begin with '*'.  They are in the machine description just
 135      to be recognized.  */
 136   if (name[0] == 0 || name[0] == '*')
 137     return;
 138
 139   len = strlen (name);
 140
 141   if (len > max_id_len)
 142     max_id_len = len;
 143
 144   printf ("#define HAVE_%s ", name);
 145   if (strlen (XSTR (insn, 2)) == 0)
 146     printf ("1\n");
 147   else
 148     {
 149       /* Write the macro definition, putting \'s at the end of each line,
 150          if more than one.  */
 151       printf ("(");
 152       for (p = XSTR (insn, 2); *p; p++)
 153         {
 154           if (*p == '\n')
 155             printf (" \\\n");
 156           else
 157             printf ("%c", *p);
 158         }
 159       printf (")\n");
 160     }
 161
 162   /* Save the current insn, so that we can later put out appropriate
 163      prototypes.  At present, most md files have the wrong number of
 164      arguments for the call insns (call, call_value, call_pop,
 165      call_value_pop) ignoring the extra arguments that are passed for
 166      some machines, so by default, turn off the prototype.  */
 167
 168   obstack_ptr = (name[0] == 'c'
 169                  && (!strcmp (name, "call")
 170                      || !strcmp (name, "call_value")
 171                      || !strcmp (name, "call_pop")
 172                      || !strcmp (name, "call_value_pop")))
 173     ? &call_obstack : &normal_obstack;
 174
 175   obstack_grow (obstack_ptr, &insn, sizeof (rtx));
 176 }
 177 \f
 178 PTR
 179 xmalloc (size)
 180   size_t size;
 181 {
 182   register PTR val = (PTR) malloc (size);
 183
 184   if (val == 0)
 185     fatal ("virtual memory exhausted");
 186
 187   return val;
 188 }
 189
 190 PTR
 191 xrealloc (old, size)
 192   PTR old;
 193   size_t size;
 194 {
 195   register PTR ptr;
 196   if (old)
 197     ptr = (PTR) realloc (old, size);
 198   else
 199     ptr = (PTR) malloc (size);
 200   if (!ptr)
 201     fatal ("virtual memory exhausted");
 202   return ptr;
 203 }
 204
 205 void
 206 fatal VPROTO ((const char *format, ...))
 207 {
 208 #ifndef ANSI_PROTOTYPES
 209   const char *format;
 210 #endif
 211   va_list ap;
 212
 213   VA_START (ap, format);
 214
 215 #ifndef ANSI_PROTOTYPES
 216   format = va_arg (ap, const char *);
 217 #endif
 218
 219   fprintf (stderr, "genflags: ");
 220   vfprintf (stderr, format, ap);
 221   va_end (ap);
 222   fprintf (stderr, "\n");
 223   exit (FATAL_EXIT_CODE);
 224 }
 225
 226 /* More 'friendly' abort that prints the line and file.
 227    config.h can #define abort fancy_abort if you like that sort of thing.  */
 228
 229 void
 230 fancy_abort ()
 231 {
 232   fatal ("Internal gcc abort.");
 233 }
 234 \f
 235 int
 236 main (argc, argv)
 237      int argc;
 238      char **argv;
 239 {
 240   rtx desc;
 241   rtx dummy;
 242   rtx *call_insns;
 243   rtx *normal_insns;
 244   rtx *insn_ptr;
 245   FILE *infile;
 246   register int c;
 247
 248   obstack_init (rtl_obstack);
 249   obstack_init (&call_obstack);
 250   obstack_init (&normal_obstack);
 251
 252   if (argc <= 1)
 253     fatal ("No input file name.");
 254
 255   infile = fopen (argv[1], "r");
 256   if (infile == 0)
 257     {
 258       perror (argv[1]);
 259       exit (FATAL_EXIT_CODE);
 260     }
 261
 262   init_rtl ();
 263
 264   printf ("/* Generated automatically by the program `genflags'\n\
 265 from the machine description file `md'.  */\n\n");
 266
 267   /* Read the machine description.  */
 268
 269   while (1)
 270     {
 271       c = read_skip_spaces (infile);
 272       if (c == EOF)
 273         break;
 274       ungetc (c, infile);
 275
 276       desc = read_rtx (infile);
 277       if (GET_CODE (desc) == DEFINE_INSN || GET_CODE (desc) == DEFINE_EXPAND)
 278         gen_insn (desc);
 279     }
 280
 281   /* Print out the prototypes now.  */
 282   dummy = (rtx) 0;
 283   obstack_grow (&call_obstack, &dummy, sizeof (rtx));
 284   call_insns = (rtx *) obstack_finish (&call_obstack);
 285
 286   obstack_grow (&normal_obstack, &dummy, sizeof (rtx));
 287   normal_insns = (rtx *) obstack_finish (&normal_obstack);
 288
 289   printf ("\n#ifndef NO_MD_PROTOTYPES\n");
 290   for (insn_ptr = normal_insns; *insn_ptr; insn_ptr++)
 291     gen_proto (*insn_ptr);
 292
 293   printf ("\n#ifdef MD_CALL_PROTOTYPES\n");
 294   for (insn_ptr = call_insns; *insn_ptr; insn_ptr++)
 295     gen_proto (*insn_ptr);
 296
 297   printf ("\n#else /* !MD_CALL_PROTOTYPES */\n");
 298   for (insn_ptr = call_insns; *insn_ptr; insn_ptr++)
 299     gen_nonproto (*insn_ptr);
 300
 301   printf ("#endif /* !MD_CALL_PROTOTYPES */\n");
 302   printf ("\n#else  /* NO_MD_PROTOTYPES */\n");
 303   for (insn_ptr = normal_insns; *insn_ptr; insn_ptr++)
 304     gen_nonproto (*insn_ptr);
 305
 306   for (insn_ptr = call_insns; *insn_ptr; insn_ptr++)
 307     gen_nonproto (*insn_ptr);
 308
 309   printf ("#endif  /* NO_MD_PROTOTYPES */\n");
 310
 311   fflush (stdout);
 312   exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
 313   /* NOTREACHED */
 314   return 0;
 315 }