gcc/gentarget-def.c

   1 /* Generate insn-target-def.h, an automatically-generated part of targetm.
   2    Copyright (C) 1987-2021 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 #include "bconfig.h"
  21 #include "system.h"
  22 #include "coretypes.h"
  23 #include "tm.h"
  24 #include "rtl.h"
  25 #include "errors.h"
  26 #include "read-md.h"
  27 #include "gensupport.h"
  28 #include "hash-table.h"
  29
  30 /* This class hashes define_insns and define_expands by name.  */
  31 struct insn_hasher : nofree_ptr_hash <rtx_def>
  32 {
  33   typedef rtx value_type;
  34   typedef const char *compare_type;
  35
  36   static inline hashval_t hash (rtx);
  37   static inline bool equal (rtx, const char *);
  38 };
  39
  40 hashval_t
  41 insn_hasher::hash (rtx x)
  42 {
  43   return htab_hash_string (XSTR (x, 0));
  44 }
  45
  46 bool
  47 insn_hasher::equal (rtx x, const char *y)
  48 {
  49   return strcmp (XSTR (x, 0), y) == 0;
  50 }
  51
  52 /* All define_insns and define_expands, hashed by name.  */
  53 static hash_table <insn_hasher> *insns;
  54
  55 /* Records the prototype suffix X for each invalid_X stub that has been
  56    generated.  */
  57 static hash_table <nofree_string_hash> *stubs;
  58
  59 /* Records which C conditions have been wrapped in functions, as a mapping
  60    from the C condition to the function name.  */
  61 static hash_map <nofree_string_hash, const char *> *have_funcs;
  62
  63 /* Return true if the part of the prototype at P is for an argument
  64    name.  If so, point *END_OUT to the first character after the name.
  65    If OPNO_OUT is nonnull, set *OPNO_OUT to the number of the associated
  66    operand.  If REQUIRED_OUT is nonnull, set *REQUIRED_OUT to whether the
  67    .md pattern is required to match the operand.  */
  68
  69 static bool
  70 parse_argument (const char *p, const char **end_out,
  71                 unsigned int *opno_out = 0,
  72                 bool *required_out = 0)
  73 {
  74   while (ISSPACE (*p))
  75     p++;
  76   if (p[0] == 'x' && ISDIGIT (p[1]))
  77     {
  78       p += 1;
  79       if (required_out)
  80         *required_out = true;
  81     }
  82   else if (p[0] == 'o' && p[1] == 'p' && p[2] == 't' && ISDIGIT (p[3]))
  83     {
  84       p += 3;
  85       if (required_out)
  86         *required_out = false;
  87     }
  88   else
  89     return false;
  90
  91   char *endptr;
  92   unsigned int opno = strtol (p, &endptr, 10);
  93   if (opno_out)
  94     *opno_out = opno;
  95   *end_out = endptr;
  96   return true;
  97 }
  98
  99
 100 /* Output hook definitions for pattern NAME, which has target-insns.def
 101    prototype PROTOTYPE.  */
 102
 103 static void
 104 def_target_insn (const char *name, const char *prototype)
 105 {
 106   /* Get an upper-case form of NAME.  */
 107   unsigned int i;
 108   char *upper_name = XALLOCAVEC (char, strlen (name) + 1);
 109   for (i = 0; name[i]; ++i)
 110     upper_name[i] = TOUPPER (name[i]);
 111   upper_name[i] = 0;
 112
 113   /* Check that the prototype is valid and concatenate the types
 114      together to get a suffix.  */
 115   char *suffix = XALLOCAVEC (char, strlen (prototype) + 1);
 116   i = 0;
 117   unsigned int opno = 0;
 118   unsigned int required_ops = 0;
 119   unsigned int this_opno;
 120   bool required_p;
 121   for (const char *p = prototype; *p; ++p)
 122     if (parse_argument (p, &p, &this_opno, &required_p))
 123       {
 124         if (this_opno != opno || (*p != ',' && *p != ')'))
 125           {
 126             error ("invalid prototype for '%s'", name);
 127             exit (FATAL_EXIT_CODE);
 128           }
 129         if (required_p && required_ops < opno)
 130           {
 131             error ("prototype for '%s' has required operands after"
 132                    " optional operands", name);
 133             exit (FATAL_EXIT_CODE);
 134           }
 135         opno += 1;
 136         if (required_p)
 137           required_ops = opno;
 138         /* Skip over ')'s.  */
 139         if (*p == ',')
 140           suffix[i++] = '_';
 141       }
 142     else if (*p == ')' || *p == ',')
 143       {
 144         /* We found the end of a parameter without finding a
 145            parameter name.  */
 146         if (strcmp (prototype, "(void)") != 0)
 147           {
 148             error ("argument %d of '%s' did not have the expected name",
 149                    opno, name);
 150             exit (FATAL_EXIT_CODE);
 151           }
 152       }
 153     else if (*p != '(' && !ISSPACE (*p))
 154       suffix[i++] = *p;
 155   suffix[i] = 0;
 156
 157   /* See whether we have an implementation of this pattern.  */
 158   hashval_t hash = htab_hash_string (name);
 159   int truth = 0;
 160   const char *have_name = name;
 161   if (rtx insn = insns->find_with_hash (name, hash))
 162     {
 163       pattern_stats stats;
 164       get_pattern_stats (&stats, XVEC (insn, 1));
 165       unsigned int actual_ops = stats.num_generator_args;
 166       if (opno == required_ops && opno != actual_ops)
 167         error_at (get_file_location (insn),
 168                   "'%s' must have %d operands (excluding match_dups)",
 169                   name, required_ops);
 170       else if (actual_ops < required_ops)
 171         error_at (get_file_location (insn),
 172                   "'%s' must have at least %d operands (excluding match_dups)",
 173                   name, required_ops);
 174       else if (actual_ops > opno)
 175         error_at (get_file_location (insn),
 176                   "'%s' must have no more than %d operands"
 177                   " (excluding match_dups)", name, opno);
 178
 179       const char *test = XSTR (insn, 2);
 180       truth = maybe_eval_c_test (test);
 181       gcc_assert (truth != 0);
 182       if (truth < 0)
 183         {
 184           /* Try to reuse an existing function that performs the same test.  */
 185           bool existed;
 186           const char *&entry = have_funcs->get_or_insert (test, &existed);
 187           if (!existed)
 188             {
 189               entry = name;
 190               printf ("\nstatic bool\n");
 191               printf ("target_have_%s (void)\n", name);
 192               printf ("{\n");
 193               printf ("  return ");
 194               rtx_reader_ptr->print_c_condition (test);
 195               printf (";\n");
 196               printf ("}\n");
 197             }
 198           have_name = entry;
 199         }
 200       printf ("\nstatic rtx_insn *\n");
 201       printf ("target_gen_%s ", name);
 202       /* Print the prototype with the argument names after ACTUAL_OPS
 203          removed.  */
 204       const char *p = prototype, *end;
 205       while (*p)
 206         if (parse_argument (p, &end, &this_opno) && this_opno >= actual_ops)
 207           p = end;
 208         else
 209           fputc (*p++, stdout);
 210
 211       printf ("\n{\n");
 212       if (truth < 0)
 213         printf ("  gcc_checking_assert (targetm.have_%s ());\n", name);
 214       printf ("  return insnify (gen_%s (", name);
 215       for (i = 0; i < actual_ops; ++i)
 216         printf ("%s%s%d", i == 0 ? "" : ", ",
 217                 i < required_ops ? "x" : "opt", i);
 218       printf ("));\n");
 219       printf ("}\n");
 220     }
 221   else
 222     {
 223       const char **slot = stubs->find_slot (suffix, INSERT);
 224       if (!*slot)
 225         {
 226           *slot = xstrdup (suffix);
 227           printf ("\nstatic rtx_insn *\n");
 228           printf ("invalid_%s ", suffix);
 229           /* Print the prototype with the argument names removed.  */
 230           const char *p = prototype;
 231           while (*p)
 232             if (!parse_argument (p, &p))
 233               fputc (*p++, stdout);
 234           printf ("\n{\n");
 235           printf ("  gcc_unreachable ();\n");
 236           printf ("}\n");
 237         }
 238     }
 239   printf ("\n#undef TARGET_HAVE_%s\n", upper_name);
 240   printf ("#define TARGET_HAVE_%s ", upper_name);
 241   if (truth == 0)
 242     printf ("hook_bool_void_false\n");
 243   else if (truth == 1)
 244     printf ("hook_bool_void_true\n");
 245   else
 246     printf ("target_have_%s\n", have_name);
 247
 248   printf ("#undef TARGET_GEN_%s\n", upper_name);
 249   printf ("#define TARGET_GEN_%s ", upper_name);
 250   if (truth == 0)
 251     printf ("invalid_%s\n", suffix);
 252   else
 253     printf ("target_gen_%s\n", name);
 254
 255   printf ("#undef TARGET_CODE_FOR_%s\n", upper_name);
 256   printf ("#define TARGET_CODE_FOR_%s ", upper_name);
 257   if (truth == 0)
 258     printf ("CODE_FOR_nothing\n");
 259   else
 260     printf ("CODE_FOR_%s\n", name);
 261 }
 262
 263 /* Record the DEFINE_INSN or DEFINE_EXPAND described by INFO.  */
 264
 265 static void
 266 add_insn (md_rtx_info *info)
 267 {
 268   rtx def = info->def;
 269   const char *name = XSTR (def, 0);
 270   if (name[0] == 0 || name[0] == '*')
 271     return;
 272
 273   hashval_t hash = htab_hash_string (name);
 274   rtx *slot = insns->find_slot_with_hash (name, hash, INSERT);
 275   if (*slot)
 276     error_at (info->loc, "duplicate definition of '%s'", name);
 277   else
 278     *slot = def;
 279 }
 280
 281 int
 282 main (int argc, const char **argv)
 283 {
 284   progname = "gentarget-def";
 285
 286   if (!init_rtx_reader_args (argc, argv))
 287     return (FATAL_EXIT_CODE);
 288
 289   insns = new hash_table <insn_hasher> (31);
 290   stubs = new hash_table <nofree_string_hash> (31);
 291   have_funcs = new hash_map <nofree_string_hash, const char *>;
 292
 293   md_rtx_info info;
 294   while (read_md_rtx (&info))
 295     switch (GET_CODE (info.def))
 296       {
 297       case DEFINE_INSN:
 298       case DEFINE_EXPAND:
 299         add_insn (&info);
 300         break;
 301
 302       default:
 303         break;
 304       }
 305
 306   printf ("/* Generated automatically by the program `gentarget-def'.  */\n");
 307   printf ("#ifndef GCC_INSN_TARGET_DEF_H\n");
 308   printf ("#define GCC_INSN_TARGET_DEF_H\n");
 309
 310   /* Output a routine to convert an rtx to an rtx_insn sequence.
 311      ??? At some point the gen_* functions themselves should return
 312          rtx_insns.  */
 313   printf ("\nstatic inline rtx_insn *\n");
 314   printf ("insnify (rtx x)\n");
 315   printf ("{\n");
 316   printf ("  if (!x)\n");
 317   printf ("    return NULL;\n");
 318   printf ("  if (rtx_insn *insn = dyn_cast <rtx_insn *> (x))\n");
 319   printf ("    return insn;\n");
 320   printf ("  start_sequence ();\n");
 321   printf ("  emit (x, false);\n");
 322   printf ("  rtx_insn *res = get_insns ();\n");
 323   printf ("  end_sequence ();\n");
 324   printf ("  return res;\n");
 325   printf ("}\n");
 326
 327 #define DEF_TARGET_INSN(INSN, ARGS) \
 328   def_target_insn (#INSN, #ARGS);
 329 #include "target-insns.def"
 330 #undef DEF_TARGET_INSN
 331
 332   printf ("\n#endif /* GCC_INSN_TARGET_DEF_H */\n");
 333
 334   if (have_error || ferror (stdout) || fflush (stdout) || fclose (stdout))
 335     return FATAL_EXIT_CODE;
 336
 337   return SUCCESS_EXIT_CODE;
 338 }