gcc/genflags.c

   1 /* Generate from machine description:
   2    - some flags HAVE_... saying which simple standard instructions are
   3    available for this machine.
   4    Copyright (C) 1987, 91, 95, 98, 99, 2000 Free Software Foundation, Inc.
   5
   6 This file is part of GNU CC.
   7
   8 GNU CC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2, or (at your option)
  11 any later version.
  12
  13 GNU CC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GNU CC; see the file COPYING.  If not, write to
  20 the Free Software Foundation, 59 Temple Place - Suite 330,
  21 Boston, MA 02111-1307, USA.  */
  22
  23
  24 #include "hconfig.h"
  25 #include "system.h"
  26 #include "rtl.h"
  27 #include "obstack.h"
  28 #include "errors.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 /* Obstacks to remember normal, and call insns.  */
  37 static struct obstack call_obstack, normal_obstack;
  38
  39 /* Max size of names encountered.  */
  40 static int max_id_len;
  41
  42 /* Max operand encountered in a scan over some insn.  */
  43 static int max_opno;
  44
  45 static void max_operand_1       PARAMS ((rtx));
  46 static int num_operands         PARAMS ((rtx));
  47 static void gen_proto           PARAMS ((rtx));
  48 static void gen_nonproto        PARAMS ((rtx));
  49 static void gen_insn            PARAMS ((rtx));
  50
  51 /* Count the number of match_operand's found.  */
  52
  53 static void
  54 max_operand_1 (x)
  55      rtx x;
  56 {
  57   register RTX_CODE code;
  58   register int i;
  59   register int len;
  60   register const char *fmt;
  61
  62   if (x == 0)
  63     return;
  64
  65   code = GET_CODE (x);
  66
  67   if (code == MATCH_OPERAND || code == MATCH_OPERATOR
  68       || code == MATCH_PARALLEL)
  69     max_opno = MAX (max_opno, XINT (x, 0));
  70
  71   fmt = GET_RTX_FORMAT (code);
  72   len = GET_RTX_LENGTH (code);
  73   for (i = 0; i < len; i++)
  74     {
  75       if (fmt[i] == 'e' || fmt[i] == 'u')
  76         max_operand_1 (XEXP (x, i));
  77       else if (fmt[i] == 'E')
  78         {
  79           int j;
  80           for (j = 0; j < XVECLEN (x, i); j++)
  81             max_operand_1 (XVECEXP (x, i, j));
  82         }
  83     }
  84 }
  85
  86 static int
  87 num_operands (insn)
  88      rtx insn;
  89 {
  90   register int len = XVECLEN (insn, 1);
  91   register int i;
  92
  93   max_opno = -1;
  94
  95   for (i = 0; i < len; i++)
  96     max_operand_1 (XVECEXP (insn, 1, i));
  97
  98   return max_opno + 1;
  99 }
 100
 101 /* Print out prototype information for a function.  */
 102
 103 static void
 104 gen_proto (insn)
 105      rtx insn;
 106 {
 107   int num = num_operands (insn);
 108   printf ("extern rtx gen_%-*s PARAMS ((", max_id_len, XSTR (insn, 0));
 109
 110   if (num == 0)
 111     printf ("void");
 112   else
 113     {
 114       while (num-- > 1)
 115         printf ("rtx, ");
 116
 117       printf ("rtx");
 118     }
 119
 120   printf ("));\n");
 121 }
 122
 123 /* Print out a function declaration without a prototype.  */
 124
 125 static void
 126 gen_nonproto (insn)
 127      rtx insn;
 128 {
 129   printf ("extern rtx gen_%s ();\n", XSTR (insn, 0));
 130 }
 131
 132 static void
 133 gen_insn (insn)
 134      rtx insn;
 135 {
 136   char *name = XSTR (insn, 0);
 137   char *p;
 138   struct obstack *obstack_ptr;
 139   int len;
 140
 141   /* Don't mention instructions whose names are the null string
 142      or begin with '*'.  They are in the machine description just
 143      to be recognized.  */
 144   if (name[0] == 0 || name[0] == '*')
 145     return;
 146
 147   len = strlen (name);
 148
 149   if (len > max_id_len)
 150     max_id_len = len;
 151
 152   printf ("#define HAVE_%s ", name);
 153   if (strlen (XSTR (insn, 2)) == 0)
 154     printf ("1\n");
 155   else
 156     {
 157       /* Write the macro definition, putting \'s at the end of each line,
 158          if more than one.  */
 159       printf ("(");
 160       for (p = XSTR (insn, 2); *p; p++)
 161         {
 162           if (*p == '\n')
 163             printf (" \\\n");
 164           else
 165             printf ("%c", *p);
 166         }
 167       printf (")\n");
 168     }
 169
 170   /* Save the current insn, so that we can later put out appropriate
 171      prototypes.  At present, most md files have the wrong number of
 172      arguments for the call insns (call, call_value, call_pop,
 173      call_value_pop) ignoring the extra arguments that are passed for
 174      some machines, so by default, turn off the prototype.  */
 175
 176   obstack_ptr = (name[0] == 'c'
 177                  && (!strcmp (name, "call")
 178                      || !strcmp (name, "call_value")
 179                      || !strcmp (name, "call_pop")
 180                      || !strcmp (name, "call_value_pop")))
 181     ? &call_obstack : &normal_obstack;
 182
 183   obstack_grow (obstack_ptr, &insn, sizeof (rtx));
 184 }
 185 \f
 186 PTR
 187 xmalloc (size)
 188   size_t size;
 189 {
 190   register PTR val = (PTR) malloc (size);
 191
 192   if (val == 0)
 193     fatal ("virtual memory exhausted");
 194
 195   return val;
 196 }
 197
 198 PTR
 199 xrealloc (old, size)
 200   PTR old;
 201   size_t size;
 202 {
 203   register PTR ptr;
 204   if (old)
 205     ptr = (PTR) realloc (old, size);
 206   else
 207     ptr = (PTR) malloc (size);
 208   if (!ptr)
 209     fatal ("virtual memory exhausted");
 210   return ptr;
 211 }
 212
 213 extern int main PARAMS ((int, char **));
 214
 215 int
 216 main (argc, argv)
 217      int argc;
 218      char **argv;
 219 {
 220   rtx desc;
 221   rtx dummy;
 222   rtx *call_insns;
 223   rtx *normal_insns;
 224   rtx *insn_ptr;
 225   FILE *infile;
 226   register int c;
 227
 228   progname = "genflags";
 229   obstack_init (rtl_obstack);
 230   obstack_init (&call_obstack);
 231   obstack_init (&normal_obstack);
 232
 233   if (argc <= 1)
 234     fatal ("No input file name.");
 235
 236   infile = fopen (argv[1], "r");
 237   if (infile == 0)
 238     {
 239       perror (argv[1]);
 240       return (FATAL_EXIT_CODE);
 241     }
 242   read_rtx_filename = argv[1];
 243
 244   printf ("/* Generated automatically by the program `genflags'\n\
 245 from the machine description file `md'.  */\n\n");
 246
 247   /* Read the machine description.  */
 248
 249   while (1)
 250     {
 251       c = read_skip_spaces (infile);
 252       if (c == EOF)
 253         break;
 254       ungetc (c, infile);
 255
 256       desc = read_rtx (infile);
 257       if (GET_CODE (desc) == DEFINE_INSN || GET_CODE (desc) == DEFINE_EXPAND)
 258         gen_insn (desc);
 259     }
 260
 261   /* Print out the prototypes now.  */
 262   dummy = (rtx) 0;
 263   obstack_grow (&call_obstack, &dummy, sizeof (rtx));
 264   call_insns = (rtx *) obstack_finish (&call_obstack);
 265
 266   obstack_grow (&normal_obstack, &dummy, sizeof (rtx));
 267   normal_insns = (rtx *) obstack_finish (&normal_obstack);
 268
 269   for (insn_ptr = normal_insns; *insn_ptr; insn_ptr++)
 270     gen_proto (*insn_ptr);
 271
 272   printf ("\n#ifdef MD_CALL_PROTOTYPES\n");
 273   for (insn_ptr = call_insns; *insn_ptr; insn_ptr++)
 274     gen_proto (*insn_ptr);
 275
 276   printf ("\n#else /* !MD_CALL_PROTOTYPES */\n");
 277   for (insn_ptr = call_insns; *insn_ptr; insn_ptr++)
 278     gen_nonproto (*insn_ptr);
 279
 280   printf ("#endif /* !MD_CALL_PROTOTYPES */\n");
 281
 282   fflush (stdout);
 283   return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
 284 }
 285
 286 /* Define this so we can link with print-rtl.o to get debug_rtx function.  */
 287 const char *
 288 get_insn_name (code)
 289      int code ATTRIBUTE_UNUSED;
 290 {
 291   return NULL;
 292 }