gcc/genopinit.c

   1 /* Generate code to initialize optabs from machine description.
   2    Copyright (C) 1993-2017 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 int
 108 main (int argc, const char **argv)
 109 {
 110   FILE *h_file, *s_file;
 111   unsigned int i, j, n, last_kind[5];
 112   optab_pattern *p;
 113
 114   progname = "genopinit";
 115
 116   if (NUM_OPTABS > 0xffff || MAX_MACHINE_MODE >= 0xff)
 117     fatal ("genopinit range assumptions invalid");
 118
 119   if (!init_rtx_reader_args_cb (argc, argv, handle_arg))
 120     return (FATAL_EXIT_CODE);
 121
 122   h_file = open_outfile (header_file_name);
 123   s_file = open_outfile (source_file_name);
 124
 125   /* Read the machine description.  */
 126   md_rtx_info info;
 127   while (read_md_rtx (&info))
 128     switch (GET_CODE (info.def))
 129       {
 130       case DEFINE_INSN:
 131       case DEFINE_EXPAND:
 132         gen_insn (&info);
 133         break;
 134
 135       default:
 136         break;
 137       }
 138
 139   /* Sort the collected patterns.  */
 140   patterns.qsort (pattern_cmp);
 141
 142   /* Now that we've handled the "extra" patterns, eliminate them from
 143      the optabs array.  That way they don't get in the way below.  */
 144   n = num_optabs;
 145   for (i = 0; i < n; )
 146     if (optabs[i].base == NULL)
 147       optabs[i] = optabs[--n];
 148     else
 149       ++i;
 150
 151   /* Sort the (real) optabs.  Better than forcing the optabs.def file to
 152      remain sorted by kind.  We also scrogged any real ordering with the
 153      purging of the X patterns above.  */
 154   qsort (optabs, n, sizeof (optab_def), optab_kind_cmp);
 155
 156   fprintf (h_file, "#ifndef GCC_INSN_OPINIT_H\n");
 157   fprintf (h_file, "#define GCC_INSN_OPINIT_H 1\n");
 158
 159   /* Emit the optab enumeration for the header file.  */
 160   fprintf (h_file, "enum optab_tag {\n");
 161   for (i = j = 0; i < n; ++i)
 162     {
 163       optabs[i].op = i;
 164       fprintf (h_file, "  %s,\n", optabs[i].name);
 165       if (optabs[i].kind != j)
 166         last_kind[j++] = i - 1;
 167     }
 168   fprintf (h_file, "  FIRST_CONV_OPTAB = %s,\n", optabs[last_kind[0]+1].name);
 169   fprintf (h_file, "  LAST_CONVLIB_OPTAB = %s,\n", optabs[last_kind[1]].name);
 170   fprintf (h_file, "  LAST_CONV_OPTAB = %s,\n", optabs[last_kind[2]].name);
 171   fprintf (h_file, "  FIRST_NORM_OPTAB = %s,\n", optabs[last_kind[2]+1].name);
 172   fprintf (h_file, "  LAST_NORMLIB_OPTAB = %s,\n", optabs[last_kind[3]].name);
 173   fprintf (h_file, "  LAST_NORM_OPTAB = %s\n", optabs[i-1].name);
 174   fprintf (h_file, "};\n\n");
 175
 176   fprintf (h_file, "#define NUM_OPTABS          %u\n", n);
 177   fprintf (h_file, "#define NUM_CONVLIB_OPTABS  %u\n",
 178            last_kind[1] - last_kind[0]);
 179   fprintf (h_file, "#define NUM_NORMLIB_OPTABS  %u\n",
 180            last_kind[3] - last_kind[2]);
 181   fprintf (h_file, "#define NUM_OPTAB_PATTERNS  %u\n",
 182            (unsigned) patterns.length ());
 183
 184   fprintf (h_file,
 185            "typedef enum optab_tag optab;\n"
 186            "typedef enum optab_tag convert_optab;\n"
 187            "typedef enum optab_tag direct_optab;\n"
 188            "\n"
 189            "struct optab_libcall_d\n"
 190            "{\n"
 191            "  char libcall_suffix;\n"
 192            "  const char *libcall_basename;\n"
 193            "  void (*libcall_gen) (optab, const char *name,\n"
 194            "                   char suffix, machine_mode);\n"
 195            "};\n"
 196            "\n"
 197            "struct convert_optab_libcall_d\n"
 198            "{\n"
 199            "  const char *libcall_basename;\n"
 200            "  void (*libcall_gen) (convert_optab, const char *name,\n"
 201            "                   machine_mode, machine_mode);\n"
 202            "};\n"
 203            "\n"
 204            "/* Given an enum insn_code, access the function to construct\n"
 205            "   the body of that kind of insn.  */\n"
 206            "#define GEN_FCN(CODE) (insn_data[CODE].genfun)\n"
 207            "\n"
 208            "#ifdef NUM_RTX_CODE\n"
 209            "/* Contains the optab used for each rtx code, and vice-versa.  */\n"
 210            "extern const optab code_to_optab_[NUM_RTX_CODE];\n"
 211            "extern const enum rtx_code optab_to_code_[NUM_OPTABS];\n"
 212            "\n"
 213            "static inline optab\n"
 214            "code_to_optab (enum rtx_code code)\n"
 215            "{\n"
 216            "  return code_to_optab_[code];\n"
 217            "}\n"
 218            "\n"
 219            "static inline enum rtx_code\n"
 220            "optab_to_code (optab op)\n"
 221            "{\n"
 222            "  return optab_to_code_[op];\n"
 223            "}\n"
 224            "#endif\n"
 225            "\n"
 226            "extern const struct convert_optab_libcall_d convlib_def[NUM_CONVLIB_OPTABS];\n"
 227            "extern const struct optab_libcall_d normlib_def[NUM_NORMLIB_OPTABS];\n"
 228            "\n"
 229            "/* Returns the active icode for the given (encoded) optab.  */\n"
 230            "extern enum insn_code raw_optab_handler (unsigned);\n"
 231            "extern bool swap_optab_enable (optab, machine_mode, bool);\n"
 232            "\n"
 233            "/* Target-dependent globals.  */\n"
 234            "struct target_optabs {\n"
 235            "  /* Patterns that are used by optabs that are enabled for this target.  */\n"
 236            "  bool pat_enable[NUM_OPTAB_PATTERNS];\n"
 237            "};\n"
 238            "extern void init_all_optabs (struct target_optabs *);\n"
 239            "\n"
 240            "extern struct target_optabs default_target_optabs;\n"
 241            "extern struct target_optabs *this_fn_optabs;\n"
 242            "#if SWITCHABLE_TARGET\n"
 243            "extern struct target_optabs *this_target_optabs;\n"
 244            "#else\n"
 245            "#define this_target_optabs (&default_target_optabs)\n"
 246            "#endif\n");
 247
 248   fprintf (s_file,
 249            "#include \"config.h\"\n"
 250            "#include \"system.h\"\n"
 251            "#include \"coretypes.h\"\n"
 252            "#include \"backend.h\"\n"
 253            "#include \"predict.h\"\n"
 254            "#include \"tree.h\"\n"
 255            "#include \"rtl.h\"\n"
 256            "#include \"alias.h\"\n"
 257            "#include \"varasm.h\"\n"
 258            "#include \"stor-layout.h\"\n"
 259            "#include \"calls.h\"\n"
 260            "#include \"memmodel.h\"\n"
 261            "#include \"tm_p.h\"\n"
 262            "#include \"flags.h\"\n"
 263            "#include \"insn-config.h\"\n"
 264            "#include \"expmed.h\"\n"
 265            "#include \"dojump.h\"\n"
 266            "#include \"explow.h\"\n"
 267            "#include \"emit-rtl.h\"\n"
 268            "#include \"stmt.h\"\n"
 269            "#include \"expr.h\"\n"
 270            "#include \"insn-codes.h\"\n"
 271            "#include \"optabs.h\"\n"
 272            "\n"
 273            "struct optab_pat {\n"
 274            "  unsigned scode;\n"
 275            "  enum insn_code icode;\n"
 276            "};\n\n");
 277
 278   fprintf (s_file,
 279            "static const struct optab_pat pats[NUM_OPTAB_PATTERNS] = {\n");
 280   for (i = 0; patterns.iterate (i, &p); ++i)
 281     fprintf (s_file, "  { %#08x, CODE_FOR_%s },\n", p->sort_num, p->name);
 282   fprintf (s_file, "};\n\n");
 283
 284   fprintf (s_file, "void\ninit_all_optabs (struct target_optabs *optabs)\n{\n");
 285   fprintf (s_file, "  bool *ena = optabs->pat_enable;\n");
 286   for (i = 0; patterns.iterate (i, &p); ++i)
 287     fprintf (s_file, "  ena[%u] = HAVE_%s;\n", i, p->name);
 288   fprintf (s_file, "}\n\n");
 289
 290   /* Perform a binary search on a pre-encoded optab+mode*2.  */
 291   /* ??? Perhaps even better to generate a minimal perfect hash.
 292      Using gperf directly is awkward since it's so geared to working
 293      with strings.  Plus we have no visibility into the ordering of
 294      the hash entries, which complicates the pat_enable array.  */
 295   fprintf (s_file,
 296            "static int\n"
 297            "lookup_handler (unsigned scode)\n"
 298            "{\n"
 299            "  int l = 0, h = ARRAY_SIZE (pats), m;\n"
 300            "  while (h > l)\n"
 301            "    {\n"
 302            "      m = (h + l) / 2;\n"
 303            "      if (scode == pats[m].scode)\n"
 304            "        return m;\n"
 305            "      else if (scode < pats[m].scode)\n"
 306            "        h = m;\n"
 307            "      else\n"
 308            "        l = m + 1;\n"
 309            "    }\n"
 310            "  return -1;\n"
 311            "}\n\n");
 312
 313   fprintf (s_file,
 314            "enum insn_code\n"
 315            "raw_optab_handler (unsigned scode)\n"
 316            "{\n"
 317            "  int i = lookup_handler (scode);\n"
 318            "  return (i >= 0 && this_fn_optabs->pat_enable[i]\n"
 319            "          ? pats[i].icode : CODE_FOR_nothing);\n"
 320            "}\n\n");
 321
 322   fprintf (s_file,
 323            "bool\n"
 324            "swap_optab_enable (optab op, machine_mode m, bool set)\n"
 325            "{\n"
 326            "  unsigned scode = (op << 16) | m;\n"
 327            "  int i = lookup_handler (scode);\n"
 328            "  if (i >= 0)\n"
 329            "    {\n"
 330            "      bool ret = this_fn_optabs->pat_enable[i];\n"
 331            "      this_fn_optabs->pat_enable[i] = set;\n"
 332            "      return ret;\n"
 333            "    }\n"
 334            "  else\n"
 335            "    {\n"
 336            "      gcc_assert (!set);\n"
 337            "      return false;\n"
 338            "    }\n"
 339            "}\n\n");
 340
 341   /* C++ (even G++) does not support (non-trivial) designated initializers.
 342      To work around that, generate these arrays programatically rather than
 343      by our traditional multiple inclusion of def files.  */
 344
 345   fprintf (s_file,
 346            "const struct convert_optab_libcall_d "
 347            "convlib_def[NUM_CONVLIB_OPTABS] = {\n");
 348   for (i = last_kind[0] + 1; i <= last_kind[1]; ++i)
 349     fprintf (s_file, "  { %s, %s },\n", optabs[i].base, optabs[i].libcall);
 350   fprintf (s_file, "};\n\n");
 351
 352   fprintf (s_file,
 353            "const struct optab_libcall_d "
 354            "normlib_def[NUM_NORMLIB_OPTABS] = {\n");
 355   for (i = last_kind[2] + 1; i <= last_kind[3]; ++i)
 356     fprintf (s_file, "  { %s, %s, %s },\n",
 357              optabs[i].suffix, optabs[i].base, optabs[i].libcall);
 358   fprintf (s_file, "};\n\n");
 359
 360   fprintf (s_file, "enum rtx_code const optab_to_code_[NUM_OPTABS] = {\n");
 361   for (i = 0; i < n; ++i)
 362     fprintf (s_file, "  %s,\n", rtx_upname[optabs[i].fcode]);
 363   fprintf (s_file, "};\n\n");
 364
 365   qsort (optabs, n, sizeof (optab_def), optab_rcode_cmp);
 366
 367   fprintf (s_file, "const optab code_to_optab_[NUM_RTX_CODE] = {\n");
 368   for (j = 0; optabs[j].rcode == UNKNOWN; ++j)
 369     continue;
 370   for (i = 0; i < NON_GENERATOR_NUM_RTX_CODE; ++i)
 371     {
 372       if (j < n && optabs[j].rcode == i)
 373         fprintf (s_file, "  %s,\n", optabs[j++].name);
 374       else
 375         fprintf (s_file, "  unknown_optab,\n");
 376     }
 377   fprintf (s_file, "};\n\n");
 378
 379   fprintf (h_file, "#endif\n");
 380   return (fclose (h_file) == 0 && fclose (s_file) == 0
 381           ? SUCCESS_EXIT_CODE : FATAL_EXIT_CODE);
 382 }