gcc/genattr.c

   1 /* Generate attribute information (insn-attr.h) from machine description.
   2    Copyright (C) 1991, 1994, 1996 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 <stdio.h>
  24 #include "hconfig.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 extern void free PROTO((void *));
  35 extern rtx read_rtx PROTO((FILE *));
  36
  37 char *xmalloc PROTO((unsigned));
  38 static void fatal ();
  39 void fancy_abort PROTO((void));
  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
  64 extend_range (range, min, max)
  65      struct range *range;
  66      int min;
  67      int max;
  68 {
  69   if (range->min > min) range->min = min;
  70   if (range->max < max) range->max = max;
  71 }
  72
  73 static void
  74 init_range (range)
  75      struct range *range;
  76 {
  77   range->min = 100000;
  78   range->max = -1;
  79 }
  80
  81 static void
  82 write_upcase (str)
  83     char *str;
  84 {
  85   for (; *str; str++)
  86     if (*str >= 'a' && *str <= 'z')
  87       printf ("%c", *str - 'a' + 'A');
  88     else
  89       printf ("%c", *str);
  90 }
  91
  92 static void
  93 gen_attr (attr)
  94      rtx attr;
  95 {
  96   char *p;
  97
  98   printf ("#define HAVE_ATTR_%s\n", XSTR (attr, 0));
  99
 100   /* If numeric attribute, don't need to write an enum.  */
 101   if (*XSTR (attr, 1) == '\0')
 102     printf ("extern int get_attr_%s ();\n", XSTR (attr, 0));
 103   else
 104     {
 105       printf ("enum attr_%s {", XSTR (attr, 0));
 106       write_upcase (XSTR (attr, 0));
 107       printf ("_");
 108
 109       for (p = XSTR (attr, 1); *p != '\0'; p++)
 110         {
 111           if (*p == ',')
 112             {
 113               printf (", ");
 114               write_upcase (XSTR (attr, 0));
 115               printf ("_");
 116             }
 117           else if (*p >= 'a' && *p <= 'z')
 118             printf ("%c", *p - 'a' + 'A');
 119           else
 120             printf ("%c", *p);
 121         }
 122
 123       printf ("};\n");
 124       printf ("extern enum attr_%s get_attr_%s ();\n\n",
 125               XSTR (attr, 0), XSTR (attr, 0));
 126     }
 127
 128   /* If `length' attribute, write additional function definitions and define
 129      variables used by `insn_current_length'.  */
 130   if (! strcmp (XSTR (attr, 0), "length"))
 131     {
 132       printf ("extern void init_lengths ();\n");
 133       printf ("extern void shorten_branches PROTO((rtx));\n");
 134       printf ("extern int insn_default_length PROTO((rtx));\n");
 135       printf ("extern int insn_variable_length_p PROTO((rtx));\n");
 136       printf ("extern int insn_current_length PROTO((rtx));\n\n");
 137       printf ("extern int *insn_addresses;\n");
 138       printf ("extern int insn_current_address;\n\n");
 139     }
 140 }
 141
 142 static void
 143 write_units (num_units, multiplicity, simultaneity,
 144              ready_cost, issue_delay, blockage)
 145      int num_units;
 146      struct range *multiplicity;
 147      struct range *simultaneity;
 148      struct range *ready_cost;
 149      struct range *issue_delay;
 150      struct range *blockage;
 151 {
 152   int i, q_size;
 153
 154   printf ("#define INSN_SCHEDULING\n\n");
 155   printf ("extern int result_ready_cost PROTO((rtx));\n");
 156   printf ("extern int function_units_used PROTO((rtx));\n\n");
 157   printf ("extern struct function_unit_desc\n");
 158   printf ("{\n");
 159   printf ("  char *name;\n");
 160   printf ("  int bitmask;\n");
 161   printf ("  int multiplicity;\n");
 162   printf ("  int simultaneity;\n");
 163   printf ("  int default_cost;\n");
 164   printf ("  int max_issue_delay;\n");
 165   printf ("  int (*ready_cost_function) ();\n");
 166   printf ("  int (*conflict_cost_function) ();\n");
 167   printf ("  int max_blockage;\n");
 168   printf ("  unsigned int (*blockage_range_function) ();\n");
 169   printf ("  int (*blockage_function) ();\n");
 170   printf ("} function_units[];\n\n");
 171   printf ("#define FUNCTION_UNITS_SIZE %d\n", num_units);
 172   printf ("#define MIN_MULTIPLICITY %d\n", multiplicity->min);
 173   printf ("#define MAX_MULTIPLICITY %d\n", multiplicity->max);
 174   printf ("#define MIN_SIMULTANEITY %d\n", simultaneity->min);
 175   printf ("#define MAX_SIMULTANEITY %d\n", simultaneity->max);
 176   printf ("#define MIN_READY_COST %d\n", ready_cost->min);
 177   printf ("#define MAX_READY_COST %d\n", ready_cost->max);
 178   printf ("#define MIN_ISSUE_DELAY %d\n", issue_delay->min);
 179   printf ("#define MAX_ISSUE_DELAY %d\n", issue_delay->max);
 180   printf ("#define MIN_BLOCKAGE %d\n", blockage->min);
 181   printf ("#define MAX_BLOCKAGE %d\n", blockage->max);
 182   for (i = 0; (1 << i) < blockage->max; i++)
 183     ;
 184   printf ("#define BLOCKAGE_BITS %d\n", i + 1);
 185
 186   /* INSN_QUEUE_SIZE is a power of two larger than MAX_BLOCKAGE and
 187      MAX_READY_COST.  This is the longest time an isnsn may be queued.  */
 188   i = MAX (blockage->max, ready_cost->max);
 189   for (q_size = 1; q_size <= i; q_size <<= 1)
 190     ;
 191   printf ("#define INSN_QUEUE_SIZE %d\n", q_size);
 192 }
 193
 194 char *
 195 xmalloc (size)
 196      unsigned size;
 197 {
 198   register char *val = (char *) malloc (size);
 199
 200   if (val == 0)
 201     fatal ("virtual memory exhausted");
 202   return val;
 203 }
 204
 205 char *
 206 xrealloc (ptr, size)
 207      char *ptr;
 208      unsigned size;
 209 {
 210   char * result = (char *) realloc (ptr, size);
 211   if (!result)
 212     fatal ("virtual memory exhausted");
 213   return result;
 214 }
 215
 216 static void
 217 fatal (s, a1, a2)
 218      char *s;
 219 {
 220   fprintf (stderr, "genattr: ");
 221   fprintf (stderr, s, a1, a2);
 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   FILE *infile;
 242   register int c;
 243   int have_delay = 0;
 244   int have_annul_true = 0;
 245   int have_annul_false = 0;
 246   int num_units = 0;
 247   struct range all_simultaneity, all_multiplicity;
 248   struct range all_ready_cost, all_issue_delay, all_blockage;
 249   struct function_unit *units = 0, *unit;
 250   int i;
 251
 252   init_range (&all_multiplicity);
 253   init_range (&all_simultaneity);
 254   init_range (&all_ready_cost);
 255   init_range (&all_issue_delay);
 256   init_range (&all_blockage);
 257
 258   obstack_init (rtl_obstack);
 259
 260   if (argc <= 1)
 261     fatal ("No input file name.");
 262
 263   infile = fopen (argv[1], "r");
 264   if (infile == 0)
 265     {
 266       perror (argv[1]);
 267       exit (FATAL_EXIT_CODE);
 268     }
 269
 270   init_rtl ();
 271
 272   printf ("/* Generated automatically by the program `genattr'\n\
 273 from the machine description file `md'.  */\n\n");
 274
 275   /* For compatibility, define the attribute `alternative', which is just
 276      a reference to the variable `which_alternative'.  */
 277
 278   printf ("#define HAVE_ATTR_alternative\n");
 279   printf ("#define get_attr_alternative(insn) which_alternative\n");
 280
 281   /* Read the machine description.  */
 282
 283   while (1)
 284     {
 285       c = read_skip_spaces (infile);
 286       if (c == EOF)
 287         break;
 288       ungetc (c, infile);
 289
 290       desc = read_rtx (infile);
 291       if (GET_CODE (desc) == DEFINE_ATTR)
 292         gen_attr (desc);
 293
 294       else if (GET_CODE (desc) == DEFINE_DELAY)
 295         {
 296           if (! have_delay)
 297             {
 298               printf ("#define DELAY_SLOTS\n");
 299               printf ("extern int num_delay_slots PROTO((rtx));\n");
 300               printf ("extern int eligible_for_delay PROTO((rtx, int, rtx, int));\n\n");
 301               printf ("extern int const_num_delay_slots PROTO((rtx));\n\n");
 302               have_delay = 1;
 303             }
 304
 305           for (i = 0; i < XVECLEN (desc, 1); i += 3)
 306             {
 307               if (XVECEXP (desc, 1, i + 1) && ! have_annul_true)
 308                 {
 309                   printf ("#define ANNUL_IFTRUE_SLOTS\n");
 310                   printf ("extern int eligible_for_annul_true ();\n");
 311                   have_annul_true = 1;
 312                 }
 313
 314               if (XVECEXP (desc, 1, i + 2) && ! have_annul_false)
 315                 {
 316                   printf ("#define ANNUL_IFFALSE_SLOTS\n");
 317                   printf ("extern int eligible_for_annul_false ();\n");
 318                   have_annul_false = 1;
 319                 }
 320             }
 321         }
 322
 323       else if (GET_CODE (desc) == DEFINE_FUNCTION_UNIT)
 324         {
 325           char *name = XSTR (desc, 0);
 326           int multiplicity = XINT (desc, 1);
 327           int simultaneity = XINT (desc, 2);
 328           int ready_cost = MAX (XINT (desc, 4), 1);
 329           int issue_delay = MAX (XINT (desc, 5), 1);
 330           int issueexp_p = (XVEC (desc, 6) != 0);
 331
 332           for (unit = units; unit; unit = unit->next)
 333             if (strcmp (unit->name, name) == 0)
 334               break;
 335
 336           if (unit == 0)
 337             {
 338               int len = strlen (name) + 1;
 339               unit = (struct function_unit *)
 340                 alloca (sizeof (struct function_unit));
 341               unit->name = (char *) alloca (len);
 342               bcopy (name, unit->name, len);
 343               unit->multiplicity = multiplicity;
 344               unit->simultaneity = simultaneity;
 345               unit->ready_cost.min = unit->ready_cost.max = ready_cost;
 346               unit->issue_delay.min = unit->issue_delay.max = issue_delay;
 347               unit->next = units;
 348               units = unit;
 349               num_units++;
 350
 351               extend_range (&all_multiplicity, multiplicity, multiplicity);
 352               extend_range (&all_simultaneity, simultaneity, simultaneity);
 353             }
 354           else if (unit->multiplicity != multiplicity
 355                    || unit->simultaneity != simultaneity)
 356             fatal ("Differing specifications given for `%s' function unit.",
 357                    unit->name);
 358
 359           extend_range (&unit->ready_cost, ready_cost, ready_cost);
 360           extend_range (&unit->issue_delay,
 361                         issueexp_p ? 1 : issue_delay, issue_delay);
 362           extend_range (&all_ready_cost,
 363                         unit->ready_cost.min, unit->ready_cost.max);
 364           extend_range (&all_issue_delay,
 365                         unit->issue_delay.min, unit->issue_delay.max);
 366         }
 367     }
 368
 369   if (num_units > 0)
 370     {
 371       /* Compute the range of blockage cost values.  See genattrtab.c
 372          for the derivation.  BLOCKAGE (E,C) when SIMULTANEITY is zero is
 373
 374              MAX (ISSUE-DELAY (E,C),
 375                   READY-COST (E) - (READY-COST (C) - 1))
 376
 377          and otherwise
 378
 379              MAX (ISSUE-DELAY (E,C),
 380                   READY-COST (E) - (READY-COST (C) - 1),
 381                   READY-COST (E) - FILL-TIME)  */
 382
 383       for (unit = units; unit; unit = unit->next)
 384         {
 385           struct range blockage;
 386
 387           blockage = unit->issue_delay;
 388           blockage.max = MAX (unit->ready_cost.max
 389                               - (unit->ready_cost.min - 1),
 390                               blockage.max);
 391           blockage.min = MAX (1, blockage.min);
 392
 393           if (unit->simultaneity != 0)
 394             {
 395               int fill_time = ((unit->simultaneity - 1)
 396                                * unit->issue_delay.min);
 397               blockage.min = MAX (unit->ready_cost.min - fill_time,
 398                                   blockage.min);
 399               blockage.max = MAX (unit->ready_cost.max - fill_time,
 400                                   blockage.max);
 401             }
 402           extend_range (&all_blockage, blockage.min, blockage.max);
 403         }
 404
 405       write_units (num_units, &all_multiplicity, &all_simultaneity,
 406                    &all_ready_cost, &all_issue_delay, &all_blockage);
 407     }
 408
 409   /* Output flag masks for use by reorg.
 410
 411      Flags are used to hold branch direction and prediction information
 412      for use by eligible_for_...  */
 413   printf("\n#define ATTR_FLAG_forward\t0x1\n");
 414   printf("#define ATTR_FLAG_backward\t0x2\n");
 415   printf("#define ATTR_FLAG_likely\t0x4\n");
 416   printf("#define ATTR_FLAG_very_likely\t0x8\n");
 417   printf("#define ATTR_FLAG_unlikely\t0x10\n");
 418   printf("#define ATTR_FLAG_very_unlikely\t0x20\n");
 419
 420   fflush (stdout);
 421   exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
 422   /* NOTREACHED */
 423   return 0;
 424 }