gcc/genopinit.c

   1 /* Generate code to initialize optabs from machine description.
   2    Copyright (C) 1993-2021 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20
  21 #include "bconfig.h"
  22 #include "system.h"
  23 #include "coretypes.h"
  24 #include "tm.h"
  25 #include "rtl.h"
  26 #include "errors.h"
  27 #include "gensupport.h"
  28
  29
  30 #define DEF_RTL_EXPR(V, N, X, C) #V,
  31
  32 static const char * const rtx_upname[] = {
  33 #include "rtl.def"
  34 };
  35
  36 #undef DEF_RTL_EXPR
  37
  38 /* Vector in which to collect insns that match.  */
  39 static vec<optab_pattern> patterns;
  40
  41 static void
  42 gen_insn (md_rtx_info *info)
  43 {
  44   optab_pattern p;
  45   if (find_optab (&p, XSTR (info->def, 0)))
  46     patterns.safe_push (p);
  47 }
  48
  49 static int
  50 pattern_cmp (const void *va, const void *vb)
  51 {
  52   const optab_pattern *a = (const optab_pattern *)va;
  53   const optab_pattern *b = (const optab_pattern *)vb;
  54   return a->sort_num - b->sort_num;
  55 }
  56
  57 static int
  58 optab_kind_cmp (const void *va, const void *vb)
  59 {
  60   const optab_def *a = (const optab_def *)va;
  61   const optab_def *b = (const optab_def *)vb;
  62   int diff = a->kind - b->kind;
  63   if (diff == 0)
  64     diff = a->op - b->op;
  65   return diff;
  66 }
  67
  68 static int
  69 optab_rcode_cmp (const void *va, const void *vb)
  70 {
  71   const optab_def *a = (const optab_def *)va;
  72   const optab_def *b = (const optab_def *)vb;
  73   return a->rcode - b->rcode;
  74 }
  75
  76 static const char *header_file_name = "init-opinit.h";
  77 static const char *source_file_name = "init-opinit.c";
  78
  79 static bool
  80 handle_arg (const char *arg)
  81 {
  82   switch (arg[1])
  83     {
  84     case 'h':
  85       header_file_name = &arg[2];
  86       return true;
  87     case 'c':
  88       source_file_name = &arg[2];
  89       return true;
  90     default:
  91       return false;
  92     }
  93 }
  94
  95 static FILE *
  96 open_outfile (const char *file_name)
  97 {
  98   FILE *f = fopen (file_name, "w");
  99   if (!f)
 100     fatal ("cannot open file %s: %s", file_name, xstrerror (errno));
 101   fprintf (f,
 102            "/* Generated automatically by the program `genopinit'\n"
 103            "   from the machine description file `md'.  */\n\n");
 104   return f;
 105 }
 106
 107 /* Declare the maybe_code_for_* function for ONAME, and provide
 108    an inline definition of the assserting code_for_* wrapper.  */
 109
 110 static void
 111 handle_overloaded_code_for (FILE *file, overloaded_name *oname)
 112 {
 113   fprintf (file, "\nextern insn_code maybe_code_for_%s (", oname->name);
 114   for (unsigned int i = 0; i < oname->arg_types.length (); ++i)
 115     fprintf (file, "%s%s", i == 0 ? "" : ", ", oname->arg_types[i]);
 116   fprintf (file, ");\n");
 117
 118   fprintf (file, "inline insn_code\ncode_for_%s (", oname->name);
 119   for (unsigned int i = 0; i < oname->arg_types.length (); ++i)
 120     fprintf (file, "%s%s arg%d", i == 0 ? "" : ", ", oname->arg_types[i], i);
 121   fprintf (file, ")\n{\n  insn_code code = maybe_code_for_%s (", oname->name);
 122   for (unsigned int i = 0; i < oname->arg_types.length (); ++i)
 123     fprintf (file, "%sarg%d", i == 0 ? "" : ", ", i);
 124   fprintf (file,
 125            ");\n"
 126            "  gcc_assert (code != CODE_FOR_nothing);\n"
 127            "  return code;\n"
 128            "}\n");
 129 }
 130
 131 /* Declare the maybe_gen_* function for ONAME, and provide
 132    an inline definition of the assserting gen_* wrapper.  */
 133
 134 static void
 135 handle_overloaded_gen (FILE *file, overloaded_name *oname)
 136 {
 137   unsigned HOST_WIDE_INT seen = 0;
 138   for (overloaded_instance *instance = oname->first_instance->next;
 139        instance; instance = instance->next)
 140     {
 141       pattern_stats stats;
 142       get_pattern_stats (&stats, XVEC (instance->insn, 1));
 143       unsigned HOST_WIDE_INT mask
 144         = HOST_WIDE_INT_1U << stats.num_generator_args;
 145       if (seen & mask)
 146         continue;
 147
 148       seen |= mask;
 149
 150       fprintf (file, "\nextern rtx maybe_gen_%s (", oname->name);
 151       for (unsigned int i = 0; i < oname->arg_types.length (); ++i)
 152         fprintf (file, "%s%s", i == 0 ? "" : ", ", oname->arg_types[i]);
 153       for (int i = 0; i < stats.num_generator_args; ++i)
 154         fprintf (file, ", rtx");
 155       fprintf (file, ");\n");
 156
 157       fprintf (file, "inline rtx\ngen_%s (", oname->name);
 158       for (unsigned int i = 0; i < oname->arg_types.length (); ++i)
 159         fprintf (file, "%s%s arg%d", i == 0 ? "" : ", ",
 160                  oname->arg_types[i], i);
 161       for (int i = 0; i < stats.num_generator_args; ++i)
 162         fprintf (file, ", rtx x%d", i);
 163       fprintf (file, ")\n{\n  rtx res = maybe_gen_%s (", oname->name);
 164       for (unsigned int i = 0; i < oname->arg_types.length (); ++i)
 165         fprintf (file, "%sarg%d", i == 0 ? "" : ", ", i);
 166       for (int i = 0; i < stats.num_generator_args; ++i)
 167         fprintf (file, ", x%d", i);
 168       fprintf (file,
 169                ");\n"
 170                "  gcc_assert (res);\n"
 171                "  return res;\n"
 172                "}\n");
 173     }
 174 }
 175
 176 int
 177 main (int argc, const char **argv)
 178 {
 179   FILE *h_file, *s_file;
 180   unsigned int i, j, n, last_kind[5];
 181   optab_pattern *p;
 182
 183   progname = "genopinit";
 184
 185   if (NUM_OPTABS > 0xffff || MAX_MACHINE_MODE >= 0xff)
 186     fatal ("genopinit range assumptions invalid");
 187
 188   if (!init_rtx_reader_args_cb (argc, argv, handle_arg))
 189     return (FATAL_EXIT_CODE);
 190
 191   h_file = open_outfile (header_file_name);
 192   s_file = open_outfile (source_file_name);
 193
 194   /* Read the machine description.  */
 195   md_rtx_info info;
 196   while (read_md_rtx (&info))
 197     switch (GET_CODE (info.def))
 198       {
 199       case DEFINE_INSN:
 200       case DEFINE_EXPAND:
 201         gen_insn (&info);
 202         break;
 203
 204       default:
 205         break;
 206       }
 207
 208   /* Sort the collected patterns.  */
 209   patterns.qsort (pattern_cmp);
 210
 211   /* Now that we've handled the "extra" patterns, eliminate them from
 212      the optabs array.  That way they don't get in the way below.  */
 213   n = num_optabs;
 214   for (i = 0; i < n; )
 215     if (optabs[i].base == NULL)
 216       optabs[i] = optabs[--n];
 217     else
 218       ++i;
 219
 220   /* Sort the (real) optabs.  Better than forcing the optabs.def file to
 221      remain sorted by kind.  We also scrogged any real ordering with the
 222      purging of the X patterns above.  */
 223   qsort (optabs, n, sizeof (optab_def), optab_kind_cmp);
 224
 225   fprintf (h_file, "#ifndef GCC_INSN_OPINIT_H\n");
 226   fprintf (h_file, "#define GCC_INSN_OPINIT_H 1\n");
 227
 228   /* Emit the optab enumeration for the header file.  */
 229   fprintf (h_file, "enum optab_tag {\n");
 230   for (i = j = 0; i < n; ++i)
 231     {
 232       optabs[i].op = i;
 233       fprintf (h_file, "  %s,\n", optabs[i].name);
 234       if (optabs[i].kind != j)
 235         last_kind[j++] = i - 1;
 236     }
 237   fprintf (h_file, "  FIRST_CONV_OPTAB = %s,\n", optabs[last_kind[0]+1].name);
 238   fprintf (h_file, "  LAST_CONVLIB_OPTAB = %s,\n", optabs[last_kind[1]].name);
 239   fprintf (h_file, "  LAST_CONV_OPTAB = %s,\n", optabs[last_kind[2]].name);
 240   fprintf (h_file, "  FIRST_NORM_OPTAB = %s,\n", optabs[last_kind[2]+1].name);
 241   fprintf (h_file, "  LAST_NORMLIB_OPTAB = %s,\n", optabs[last_kind[3]].name);
 242   fprintf (h_file, "  LAST_NORM_OPTAB = %s\n", optabs[i-1].name);
 243   fprintf (h_file, "};\n\n");
 244
 245   fprintf (h_file, "#define NUM_OPTABS          %u\n", n);
 246   fprintf (h_file, "#define NUM_CONVLIB_OPTABS  %u\n",
 247            last_kind[1] - last_kind[0]);
 248   fprintf (h_file, "#define NUM_NORMLIB_OPTABS  %u\n",
 249            last_kind[3] - last_kind[2]);
 250   fprintf (h_file, "#define NUM_OPTAB_PATTERNS  %u\n",
 251            (unsigned) patterns.length ());
 252
 253   fprintf (h_file,
 254            "typedef enum optab_tag optab;\n"
 255            "typedef enum optab_tag convert_optab;\n"
 256            "typedef enum optab_tag direct_optab;\n"
 257            "\n"
 258            "struct optab_libcall_d\n"
 259            "{\n"
 260            "  char libcall_suffix;\n"
 261            "  const char *libcall_basename;\n"
 262            "  void (*libcall_gen) (optab, const char *name,\n"
 263            "                   char suffix, machine_mode);\n"
 264            "};\n"
 265            "\n"
 266            "struct convert_optab_libcall_d\n"
 267            "{\n"
 268            "  const char *libcall_basename;\n"
 269            "  void (*libcall_gen) (convert_optab, const char *name,\n"
 270            "                   machine_mode, machine_mode);\n"
 271            "};\n"
 272            "\n"
 273            "/* Given an enum insn_code, access the function to construct\n"
 274            "   the body of that kind of insn.  */\n"
 275            "#define GEN_FCN(CODE) (insn_data[CODE].genfun)\n"
 276            "\n"
 277            "#ifdef NUM_RTX_CODE\n"
 278            "/* Contains the optab used for each rtx code, and vice-versa.  */\n"
 279            "extern const optab code_to_optab_[NUM_RTX_CODE];\n"
 280            "extern const enum rtx_code optab_to_code_[NUM_OPTABS];\n"
 281            "\n"
 282            "static inline optab\n"
 283            "code_to_optab (enum rtx_code code)\n"
 284            "{\n"
 285            "  return code_to_optab_[code];\n"
 286            "}\n"
 287            "\n"
 288            "static inline enum rtx_code\n"
 289            "optab_to_code (optab op)\n"
 290            "{\n"
 291            "  return optab_to_code_[op];\n"
 292            "}\n");
 293
 294   for (overloaded_name *oname = rtx_reader_ptr->get_overloads ();
 295        oname; oname = oname->next)
 296     {
 297       handle_overloaded_code_for (h_file, oname);
 298       handle_overloaded_gen (h_file, oname);
 299     }
 300
 301   fprintf (h_file,
 302            "#endif\n"
 303            "\n"
 304            "extern const struct convert_optab_libcall_d convlib_def[NUM_CONVLIB_OPTABS];\n"
 305            "extern const struct optab_libcall_d normlib_def[NUM_NORMLIB_OPTABS];\n"
 306            "\n"
 307            "/* Returns the active icode for the given (encoded) optab.  */\n"
 308            "extern enum insn_code raw_optab_handler (unsigned);\n"
 309            "extern bool swap_optab_enable (optab, machine_mode, bool);\n"
 310            "\n"
 311            "/* Target-dependent globals.  */\n"
 312            "struct target_optabs {\n"
 313            "  /* Patterns that are used by optabs that are enabled for this target.  */\n"
 314            "  bool pat_enable[NUM_OPTAB_PATTERNS];\n"
 315            "\n"
 316            "  /* Cache if the target supports vec_gather_load for at least one vector\n"
 317            "     mode.  */\n"
 318            "  bool supports_vec_gather_load;\n"
 319            "  bool supports_vec_gather_load_cached;\n"
 320            "  bool supports_vec_scatter_store;\n"
 321            "  bool supports_vec_scatter_store_cached;\n"
 322            "};\n"
 323            "extern void init_all_optabs (struct target_optabs *);\n"
 324            "\n"
 325            "extern struct target_optabs default_target_optabs;\n"
 326            "extern struct target_optabs *this_fn_optabs;\n"
 327            "#if SWITCHABLE_TARGET\n"
 328            "extern struct target_optabs *this_target_optabs;\n"
 329            "#else\n"
 330            "#define this_target_optabs (&default_target_optabs)\n"
 331            "#endif\n");
 332
 333   fprintf (s_file,
 334            "#define IN_TARGET_CODE 1\n"
 335            "#include \"config.h\"\n"
 336            "#include \"system.h\"\n"
 337            "#include \"coretypes.h\"\n"
 338            "#include \"backend.h\"\n"
 339            "#include \"predict.h\"\n"
 340            "#include \"tree.h\"\n"
 341            "#include \"rtl.h\"\n"
 342            "#include \"alias.h\"\n"
 343            "#include \"varasm.h\"\n"
 344            "#include \"stor-layout.h\"\n"
 345            "#include \"calls.h\"\n"
 346            "#include \"memmodel.h\"\n"
 347            "#include \"tm_p.h\"\n"
 348            "#include \"flags.h\"\n"
 349            "#include \"insn-config.h\"\n"
 350            "#include \"expmed.h\"\n"
 351            "#include \"dojump.h\"\n"
 352            "#include \"explow.h\"\n"
 353            "#include \"emit-rtl.h\"\n"
 354            "#include \"stmt.h\"\n"
 355            "#include \"expr.h\"\n"
 356            "#include \"insn-codes.h\"\n"
 357            "#include \"optabs.h\"\n"
 358            "\n"
 359            "struct optab_pat {\n"
 360            "  unsigned scode;\n"
 361            "  enum insn_code icode;\n"
 362            "};\n\n");
 363
 364   fprintf (s_file,
 365            "static const struct optab_pat pats[NUM_OPTAB_PATTERNS] = {\n");
 366   for (i = 0; patterns.iterate (i, &p); ++i)
 367     fprintf (s_file, "  { %#08x, CODE_FOR_%s },\n", p->sort_num, p->name);
 368   fprintf (s_file, "};\n\n");
 369
 370   fprintf (s_file, "void\ninit_all_optabs (struct target_optabs *optabs)\n{\n");
 371   fprintf (s_file, "  bool *ena = optabs->pat_enable;\n");
 372   for (i = 0; patterns.iterate (i, &p); ++i)
 373     fprintf (s_file, "  ena[%u] = HAVE_%s;\n", i, p->name);
 374   fprintf (s_file, "}\n\n");
 375
 376   /* Perform a binary search on a pre-encoded optab+mode*2.  */
 377   /* ??? Perhaps even better to generate a minimal perfect hash.
 378      Using gperf directly is awkward since it's so geared to working
 379      with strings.  Plus we have no visibility into the ordering of
 380      the hash entries, which complicates the pat_enable array.  */
 381   fprintf (s_file,
 382            "static int\n"
 383            "lookup_handler (unsigned scode)\n"
 384            "{\n"
 385            "  int l = 0, h = ARRAY_SIZE (pats), m;\n"
 386            "  while (h > l)\n"
 387            "    {\n"
 388            "      m = (h + l) / 2;\n"
 389            "      if (scode == pats[m].scode)\n"
 390            "        return m;\n"
 391            "      else if (scode < pats[m].scode)\n"
 392            "        h = m;\n"
 393            "      else\n"
 394            "        l = m + 1;\n"
 395            "    }\n"
 396            "  return -1;\n"
 397            "}\n\n");
 398
 399   fprintf (s_file,
 400            "enum insn_code\n"
 401            "raw_optab_handler (unsigned scode)\n"
 402            "{\n"
 403            "  int i = lookup_handler (scode);\n"
 404            "  return (i >= 0 && this_fn_optabs->pat_enable[i]\n"
 405            "          ? pats[i].icode : CODE_FOR_nothing);\n"
 406            "}\n\n");
 407
 408   fprintf (s_file,
 409            "bool\n"
 410            "swap_optab_enable (optab op, machine_mode m, bool set)\n"
 411            "{\n"
 412            "  unsigned scode = (op << 16) | m;\n"
 413            "  int i = lookup_handler (scode);\n"
 414            "  if (i >= 0)\n"
 415            "    {\n"
 416            "      bool ret = this_fn_optabs->pat_enable[i];\n"
 417            "      this_fn_optabs->pat_enable[i] = set;\n"
 418            "      return ret;\n"
 419            "    }\n"
 420            "  else\n"
 421            "    {\n"
 422            "      gcc_assert (!set);\n"
 423            "      return false;\n"
 424            "    }\n"
 425            "}\n\n");
 426
 427   /* C++ (even G++) does not support (non-trivial) designated initializers.
 428      To work around that, generate these arrays programatically rather than
 429      by our traditional multiple inclusion of def files.  */
 430
 431   fprintf (s_file,
 432            "const struct convert_optab_libcall_d "
 433            "convlib_def[NUM_CONVLIB_OPTABS] = {\n");
 434   for (i = last_kind[0] + 1; i <= last_kind[1]; ++i)
 435     fprintf (s_file, "  { %s, %s },\n", optabs[i].base, optabs[i].libcall);
 436   fprintf (s_file, "};\n\n");
 437
 438   fprintf (s_file,
 439            "const struct optab_libcall_d "
 440            "normlib_def[NUM_NORMLIB_OPTABS] = {\n");
 441   for (i = last_kind[2] + 1; i <= last_kind[3]; ++i)
 442     fprintf (s_file, "  { %s, %s, %s },\n",
 443              optabs[i].suffix, optabs[i].base, optabs[i].libcall);
 444   fprintf (s_file, "};\n\n");
 445
 446   fprintf (s_file, "enum rtx_code const optab_to_code_[NUM_OPTABS] = {\n");
 447   for (i = 0; i < n; ++i)
 448     fprintf (s_file, "  %s,\n", rtx_upname[optabs[i].fcode]);
 449   fprintf (s_file, "};\n\n");
 450
 451   qsort (optabs, n, sizeof (optab_def), optab_rcode_cmp);
 452
 453   fprintf (s_file, "const optab code_to_optab_[NUM_RTX_CODE] = {\n");
 454   for (j = 0; optabs[j].rcode == UNKNOWN; ++j)
 455     continue;
 456   for (i = 0; i < NON_GENERATOR_NUM_RTX_CODE; ++i)
 457     {
 458       if (j < n && optabs[j].rcode == i)
 459         fprintf (s_file, "  %s,\n", optabs[j++].name);
 460       else
 461         fprintf (s_file, "  unknown_optab,\n");
 462     }
 463   fprintf (s_file, "};\n\n");
 464
 465   fprintf (h_file, "#endif\n");
 466   return (fclose (h_file) == 0 && fclose (s_file) == 0
 467           ? SUCCESS_EXIT_CODE : FATAL_EXIT_CODE);
 468 }