gcc/genattr.c

   1 /* Generate attribute information (insn-attr.h) from machine description.
   2    Copyright (C) 1991, 1994, 1996, 1998 Free Software Foundation, Inc.
   3    Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu)
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22
  23 #include "hconfig.h"
  24 #include "system.h"
  25 #include "rtl.h"
  26 #include "obstack.h"
  27
  28 static struct obstack obstack;
  29 struct obstack *rtl_obstack = &obstack;
  30
  31 #define obstack_chunk_alloc xmalloc
  32 #define obstack_chunk_free free
  33
  34 char *xmalloc PROTO((unsigned));
  35 static void fatal PVPROTO ((char *, ...)) ATTRIBUTE_PRINTF_1;
  36 void fancy_abort PROTO((void));
  37
  38 /* Define this so we can link with print-rtl.o to get debug_rtx function.  */
  39 char **insn_name_ptr = 0;
  40
  41 /* A range of values.  */
  42
  43 struct range
  44 {
  45   int min;
  46   int max;
  47 };
  48
  49 /* Record information about each function unit mentioned in a
  50    DEFINE_FUNCTION_UNIT.  */
  51
  52 struct function_unit
  53 {
  54   char *name;                   /* Function unit name.  */
  55   struct function_unit *next;   /* Next function unit.  */
  56   int multiplicity;             /* Number of units of this type.  */
  57   int simultaneity;             /* Maximum number of simultaneous insns
  58                                    on this function unit or 0 if unlimited.  */
  59   struct range ready_cost;      /* Range of ready cost values.  */
  60   struct range issue_delay;     /* Range of issue delay values.  */
  61 };
  62
  63 static void extend_range PROTO((struct range *, int, int));
  64 static void init_range PROTO((struct range *));
  65 static void write_upcase PROTO((char *));
  66 static void gen_attr PROTO((rtx));
  67 static void write_units PROTO((int, struct range *, struct range *,
  68                                struct range *, struct range *,
  69                                struct range *));
  70 static void
  71 extend_range (range, min, max)
  72      struct range *range;
  73      int min;
  74      int max;
  75 {
  76   if (range->min > min) range->min = min;
  77   if (range->max < max) range->max = max;
  78 }
  79
  80 static void
  81 init_range (range)
  82      struct range *range;
  83 {
  84   range->min = 100000;
  85   range->max = -1;
  86 }
  87
  88 static void
  89 write_upcase (str)
  90     char *str;
  91 {
  92   for (; *str; str++)
  93     if (*str >= 'a' && *str <= 'z')
  94       printf ("%c", *str - 'a' + 'A');
  95     else
  96       printf ("%c", *str);
  97 }
  98
  99 static void
 100 gen_attr (attr)
 101      rtx attr;
 102 {
 103   char *p;
 104
 105   printf ("#define HAVE_ATTR_%s\n", XSTR (attr, 0));
 106
 107   /* If numeric attribute, don't need to write an enum.  */
 108   if (*XSTR (attr, 1) == '\0')
 109     printf ("extern int get_attr_%s ();\n", XSTR (attr, 0));
 110   else
 111     {
 112       printf ("enum attr_%s {", XSTR (attr, 0));
 113       write_upcase (XSTR (attr, 0));
 114       printf ("_");
 115
 116       for (p = XSTR (attr, 1); *p != '\0'; p++)
 117         {
 118           if (*p == ',')
 119             {
 120               printf (", ");
 121               write_upcase (XSTR (attr, 0));
 122               printf ("_");
 123             }
 124           else if (*p >= 'a' && *p <= 'z')
 125             printf ("%c", *p - 'a' + 'A');
 126           else
 127             printf ("%c", *p);
 128         }
 129
 130       printf ("};\n");
 131       printf ("extern enum attr_%s get_attr_%s ();\n\n",
 132               XSTR (attr, 0), XSTR (attr, 0));
 133     }
 134
 135   /* If `length' attribute, write additional function definitions and define
 136      variables used by `insn_current_length'.  */
 137   if (! strcmp (XSTR (attr, 0), "length"))
 138     {
 139       printf ("extern void init_lengths ();\n");
 140       printf ("extern void shorten_branches PROTO((rtx));\n");
 141       printf ("extern int insn_default_length PROTO((rtx));\n");
 142       printf ("extern int insn_variable_length_p PROTO((rtx));\n");
 143       printf ("extern int insn_current_length PROTO((rtx));\n\n");
 144       printf ("extern int *insn_addresses;\n");
 145       printf ("extern int insn_current_address;\n\n");
 146     }
 147 }
 148
 149 static void
 150 write_units (num_units, multiplicity, simultaneity,
 151              ready_cost, issue_delay, blockage)
 152      int num_units;
 153      struct range *multiplicity;
 154      struct range *simultaneity;
 155      struct range *ready_cost;
 156      struct range *issue_delay;
 157      struct range *blockage;
 158 {
 159   int i, q_size;
 160
 161   printf ("#define INSN_SCHEDULING\n\n");
 162   printf ("extern int result_ready_cost PROTO((rtx));\n");
 163   printf ("extern int function_units_used PROTO((rtx));\n\n");
 164   printf ("extern struct function_unit_desc\n");
 165   printf ("{\n");
 166   printf ("  char *name;\n");
 167   printf ("  int bitmask;\n");
 168   printf ("  int multiplicity;\n");
 169   printf ("  int simultaneity;\n");
 170   printf ("  int default_cost;\n");
 171   printf ("  int max_issue_delay;\n");
 172   printf ("  int (*ready_cost_function) ();\n");
 173   printf ("  int (*conflict_cost_function) ();\n");
 174   printf ("  int max_blockage;\n");
 175   printf ("  unsigned int (*blockage_range_function) ();\n");
 176   printf ("  int (*blockage_function) ();\n");
 177   printf ("} function_units[];\n\n");
 178   printf ("#define FUNCTION_UNITS_SIZE %d\n", num_units);
 179   printf ("#define MIN_MULTIPLICITY %d\n", multiplicity->min);
 180   printf ("#define MAX_MULTIPLICITY %d\n", multiplicity->max);
 181   printf ("#define MIN_SIMULTANEITY %d\n", simultaneity->min);
 182   printf ("#define MAX_SIMULTANEITY %d\n", simultaneity->max);
 183   printf ("#define MIN_READY_COST %d\n", ready_cost->min);
 184   printf ("#define MAX_READY_COST %d\n", ready_cost->max);
 185   printf ("#define MIN_ISSUE_DELAY %d\n", issue_delay->min);
 186   printf ("#define MAX_ISSUE_DELAY %d\n", issue_delay->max);
 187   printf ("#define MIN_BLOCKAGE %d\n", blockage->min);
 188   printf ("#define MAX_BLOCKAGE %d\n", blockage->max);
 189   for (i = 0; (1 << i) < blockage->max; i++)
 190     ;
 191   printf ("#define BLOCKAGE_BITS %d\n", i + 1);
 192
 193   /* INSN_QUEUE_SIZE is a power of two larger than MAX_BLOCKAGE and
 194      MAX_READY_COST.  This is the longest time an isnsn may be queued.  */
 195   i = MAX (blockage->max, ready_cost->max);
 196   for (q_size = 1; q_size <= i; q_size <<= 1)
 197     ;
 198   printf ("#define INSN_QUEUE_SIZE %d\n", q_size);
 199 }
 200
 201 char *
 202 xmalloc (size)
 203      unsigned size;
 204 {
 205   register char *val = (char *) malloc (size);
 206
 207   if (val == 0)
 208     fatal ("virtual memory exhausted");
 209   return val;
 210 }
 211
 212 char *
 213 xrealloc (ptr, size)
 214      char *ptr;
 215      unsigned size;
 216 {
 217   char * result = (char *) realloc (ptr, size);
 218   if (!result)
 219     fatal ("virtual memory exhausted");
 220   return result;
 221 }
 222
 223 static void
 224 fatal VPROTO ((char *format, ...))
 225 {
 226 #ifndef __STDC__
 227   char *format;
 228 #endif
 229   va_list ap;
 230
 231   VA_START (ap, format);
 232
 233 #ifndef __STDC__
 234   format = va_arg (ap, char *);
 235 #endif
 236
 237   fprintf (stderr, "genattr: ");
 238   vfprintf (stderr, format, ap);
 239   va_end (ap);
 240   fprintf (stderr, "\n");
 241   exit (FATAL_EXIT_CODE);
 242 }
 243
 244 /* More 'friendly' abort that prints the line and file.
 245    config.h can #define abort fancy_abort if you like that sort of thing.  */
 246
 247 void
 248 fancy_abort ()
 249 {
 250   fatal ("Internal gcc abort.");
 251 }
 252 \f
 253 int
 254 main (argc, argv)
 255      int argc;
 256      char **argv;
 257 {
 258   rtx desc;
 259   FILE *infile;
 260   register int c;
 261   int have_delay = 0;
 262   int have_annul_true = 0;
 263   int have_annul_false = 0;
 264   int num_units = 0;
 265   struct range all_simultaneity, all_multiplicity;
 266   struct range all_ready_cost, all_issue_delay, all_blockage;
 267   struct function_unit *units = 0, *unit;
 268   int i;
 269
 270   init_range (&all_multiplicity);
 271   init_range (&all_simultaneity);
 272   init_range (&all_ready_cost);
 273   init_range (&all_issue_delay);
 274   init_range (&all_blockage);
 275
 276   obstack_init (rtl_obstack);
 277
 278   if (argc <= 1)
 279     fatal ("No input file name.");
 280
 281   infile = fopen (argv[1], "r");
 282   if (infile == 0)
 283     {
 284       perror (argv[1]);
 285       exit (FATAL_EXIT_CODE);
 286     }
 287
 288   init_rtl ();
 289
 290   printf ("/* Generated automatically by the program `genattr'\n\
 291 from the machine description file `md'.  */\n\n");
 292
 293   /* For compatibility, define the attribute `alternative', which is just
 294      a reference to the variable `which_alternative'.  */
 295
 296   printf ("#define HAVE_ATTR_alternative\n");
 297   printf ("#define get_attr_alternative(insn) which_alternative\n");
 298
 299   /* Read the machine description.  */
 300
 301   while (1)
 302     {
 303       c = read_skip_spaces (infile);
 304       if (c == EOF)
 305         break;
 306       ungetc (c, infile);
 307
 308       desc = read_rtx (infile);
 309       if (GET_CODE (desc) == DEFINE_ATTR)
 310         gen_attr (desc);
 311
 312       else if (GET_CODE (desc) == DEFINE_DELAY)
 313         {
 314           if (! have_delay)
 315             {
 316               printf ("#define DELAY_SLOTS\n");
 317               printf ("extern int num_delay_slots PROTO((rtx));\n");
 318               printf ("extern int eligible_for_delay PROTO((rtx, int, rtx, int));\n\n");
 319               printf ("extern int const_num_delay_slots PROTO((rtx));\n\n");
 320               have_delay = 1;
 321             }
 322
 323           for (i = 0; i < XVECLEN (desc, 1); i += 3)
 324             {
 325               if (XVECEXP (desc, 1, i + 1) && ! have_annul_true)
 326                 {
 327                   printf ("#define ANNUL_IFTRUE_SLOTS\n");
 328                   printf ("extern int eligible_for_annul_true ();\n");
 329                   have_annul_true = 1;
 330                 }
 331
 332               if (XVECEXP (desc, 1, i + 2) && ! have_annul_false)
 333                 {
 334                   printf ("#define ANNUL_IFFALSE_SLOTS\n");
 335                   printf ("extern int eligible_for_annul_false ();\n");
 336                   have_annul_false = 1;
 337                 }
 338             }
 339         }
 340
 341       else if (GET_CODE (desc) == DEFINE_FUNCTION_UNIT)
 342         {
 343           char *name = XSTR (desc, 0);
 344           int multiplicity = XINT (desc, 1);
 345           int simultaneity = XINT (desc, 2);
 346           int ready_cost = MAX (XINT (desc, 4), 1);
 347           int issue_delay = MAX (XINT (desc, 5), 1);
 348           int issueexp_p = (XVEC (desc, 6) != 0);
 349
 350           for (unit = units; unit; unit = unit->next)
 351             if (strcmp (unit->name, name) == 0)
 352               break;
 353
 354           if (unit == 0)
 355             {
 356               int len = strlen (name) + 1;
 357               unit = (struct function_unit *)
 358                 alloca (sizeof (struct function_unit));
 359               unit->name = (char *) alloca (len);
 360               bcopy (name, unit->name, len);
 361               unit->multiplicity = multiplicity;
 362               unit->simultaneity = simultaneity;
 363               unit->ready_cost.min = unit->ready_cost.max = ready_cost;
 364               unit->issue_delay.min = unit->issue_delay.max = issue_delay;
 365               unit->next = units;
 366               units = unit;
 367               num_units++;
 368
 369               extend_range (&all_multiplicity, multiplicity, multiplicity);
 370               extend_range (&all_simultaneity, simultaneity, simultaneity);
 371             }
 372           else if (unit->multiplicity != multiplicity
 373                    || unit->simultaneity != simultaneity)
 374             fatal ("Differing specifications given for `%s' function unit.",
 375                    unit->name);
 376
 377           extend_range (&unit->ready_cost, ready_cost, ready_cost);
 378           extend_range (&unit->issue_delay,
 379                         issueexp_p ? 1 : issue_delay, issue_delay);
 380           extend_range (&all_ready_cost,
 381                         unit->ready_cost.min, unit->ready_cost.max);
 382           extend_range (&all_issue_delay,
 383                         unit->issue_delay.min, unit->issue_delay.max);
 384         }
 385     }
 386
 387   if (num_units > 0)
 388     {
 389       /* Compute the range of blockage cost values.  See genattrtab.c
 390          for the derivation.  BLOCKAGE (E,C) when SIMULTANEITY is zero is
 391
 392              MAX (ISSUE-DELAY (E,C),
 393                   READY-COST (E) - (READY-COST (C) - 1))
 394
 395          and otherwise
 396
 397              MAX (ISSUE-DELAY (E,C),
 398                   READY-COST (E) - (READY-COST (C) - 1),
 399                   READY-COST (E) - FILL-TIME)  */
 400
 401       for (unit = units; unit; unit = unit->next)
 402         {
 403           struct range blockage;
 404
 405           blockage = unit->issue_delay;
 406           blockage.max = MAX (unit->ready_cost.max
 407                               - (unit->ready_cost.min - 1),
 408                               blockage.max);
 409           blockage.min = MAX (1, blockage.min);
 410
 411           if (unit->simultaneity != 0)
 412             {
 413               int fill_time = ((unit->simultaneity - 1)
 414                                * unit->issue_delay.min);
 415               blockage.min = MAX (unit->ready_cost.min - fill_time,
 416                                   blockage.min);
 417               blockage.max = MAX (unit->ready_cost.max - fill_time,
 418                                   blockage.max);
 419             }
 420           extend_range (&all_blockage, blockage.min, blockage.max);
 421         }
 422
 423       write_units (num_units, &all_multiplicity, &all_simultaneity,
 424                    &all_ready_cost, &all_issue_delay, &all_blockage);
 425     }
 426
 427   /* Output flag masks for use by reorg.
 428
 429      Flags are used to hold branch direction and prediction information
 430      for use by eligible_for_...  */
 431   printf("\n#define ATTR_FLAG_forward\t0x1\n");
 432   printf("#define ATTR_FLAG_backward\t0x2\n");
 433   printf("#define ATTR_FLAG_likely\t0x4\n");
 434   printf("#define ATTR_FLAG_very_likely\t0x8\n");
 435   printf("#define ATTR_FLAG_unlikely\t0x10\n");
 436   printf("#define ATTR_FLAG_very_unlikely\t0x20\n");
 437
 438   fflush (stdout);
 439   exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
 440   /* NOTREACHED */
 441   return 0;
 442 }