gcc/hooks.c

   1 /* General-purpose hooks.
   2    Copyright (C) 2002-2014 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify it
   5    under the terms of the GNU General Public License as published by the
   6    Free Software Foundation; either version 3, or (at your option) any
   7    later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; see the file COPYING3.  If not see
  16    <http://www.gnu.org/licenses/>.
  17
  18    In other words, you are welcome to use, share and improve this program.
  19    You are forbidden to forbid anyone else to use, share and improve
  20    what you give them.   Help stamp out software-hoarding!  */
  21
  22 /* This file contains generic hooks that can be used as defaults for
  23    target or language-dependent hook initializers.  */
  24
  25 #include "config.h"
  26 #include "system.h"
  27 #include "coretypes.h"
  28 #include "tm.h"
  29 #include "hooks.h"
  30
  31 /* Generic hook that does absolutely zappo.  */
  32 void
  33 hook_void_void (void)
  34 {
  35 }
  36
  37 /* Generic hook that takes no arguments and returns false.  */
  38 bool
  39 hook_bool_void_false (void)
  40 {
  41   return false;
  42 }
  43
  44 /* Generic hook that takes no arguments and returns true.  */
  45 bool
  46 hook_bool_void_true (void)
  47 {
  48   return true;
  49 }
  50
  51 /* Generic hook that takes (bool) and returns false.  */
  52 bool
  53 hook_bool_bool_false (bool a ATTRIBUTE_UNUSED)
  54 {
  55   return false;
  56 }
  57
  58 /* Generic hook that takes (bool, struct gcc_options *) and returns false.  */
  59 bool
  60 hook_bool_bool_gcc_optionsp_false (bool a ATTRIBUTE_UNUSED,
  61                                    struct gcc_options *opts ATTRIBUTE_UNUSED)
  62 {
  63   return false;
  64 }
  65
  66 /* Generic hook that takes const int, const int) and returns true.  */
  67 bool hook_bool_const_int_const_int_true (const int a ATTRIBUTE_UNUSED,
  68                                          const int b ATTRIBUTE_UNUSED)
  69 {
  70   return true;
  71 }
  72
  73 /* Generic hook that takes (machine_mode) and returns false.  */
  74 bool
  75 hook_bool_mode_false (machine_mode mode ATTRIBUTE_UNUSED)
  76 {
  77   return false;
  78 }
  79
  80 /* Generic hook that takes (machine_mode) and returns true.  */
  81 bool
  82 hook_bool_mode_true (machine_mode mode ATTRIBUTE_UNUSED)
  83 {
  84   return true;
  85 }
  86
  87 /* Generic hook that takes (machine_mode, const_rtx) and returns false.  */
  88 bool
  89 hook_bool_mode_const_rtx_false (machine_mode mode ATTRIBUTE_UNUSED,
  90                                 const_rtx value ATTRIBUTE_UNUSED)
  91 {
  92   return false;
  93 }
  94
  95 /* Generic hook that takes (machine_mode, const_rtx) and returns true.  */
  96 bool
  97 hook_bool_mode_const_rtx_true (machine_mode mode ATTRIBUTE_UNUSED,
  98                                const_rtx value ATTRIBUTE_UNUSED)
  99 {
 100   return true;
 101 }
 102
 103 /* Generic hook that takes (machine_mode, rtx) and returns false.  */
 104 bool
 105 hook_bool_mode_rtx_false (machine_mode mode ATTRIBUTE_UNUSED,
 106                           rtx value ATTRIBUTE_UNUSED)
 107 {
 108   return false;
 109 }
 110
 111 /* Generic hook that takes (machine_mode, rtx) and returns true.  */
 112 bool
 113 hook_bool_mode_rtx_true (machine_mode mode ATTRIBUTE_UNUSED,
 114                          rtx value ATTRIBUTE_UNUSED)
 115 {
 116   return true;
 117 }
 118
 119 /* Generic hook that takes (const rtx_insn *, const rtx_insn *) and returns true.  */
 120 bool
 121 hook_bool_const_rtx_insn_const_rtx_insn_true (const rtx_insn *follower ATTRIBUTE_UNUSED,
 122                                               const rtx_insn *followee ATTRIBUTE_UNUSED)
 123 {
 124   return true;
 125 }
 126
 127 /* Generic hook that takes (machine_mode, unsigned HOST_WIDE_INT)
 128    and returns false.  */
 129 bool
 130 hook_bool_mode_uhwi_false (machine_mode mode ATTRIBUTE_UNUSED,
 131                            unsigned HOST_WIDE_INT value ATTRIBUTE_UNUSED)
 132 {
 133   return false;
 134 }
 135
 136 /* Generic hook that takes (FILE *, const char *) and does nothing.  */
 137 void
 138 hook_void_FILEptr_constcharptr (FILE *a ATTRIBUTE_UNUSED, const char *b ATTRIBUTE_UNUSED)
 139 {
 140 }
 141
 142 /* Generic hook that takes (FILE *, const char *, constr_tree *) and does
 143    nothing.  */
 144 void
 145 hook_void_FILEptr_constcharptr_const_tree (FILE *, const char *, const_tree)
 146 {
 147 }
 148
 149 /* Generic hook that takes (FILE *, rtx) and returns false.  */
 150 bool
 151 hook_bool_FILEptr_rtx_false (FILE *a ATTRIBUTE_UNUSED,
 152                              rtx b ATTRIBUTE_UNUSED)
 153 {
 154   return false;
 155 }
 156
 157 /* Generic hook that takes (gimple_stmt_iterator *) and returns
 158    false.  */
 159 bool
 160 hook_bool_gsiptr_false (gimple_stmt_iterator *a ATTRIBUTE_UNUSED)
 161 {
 162   return false;
 163 }
 164
 165 /* Used for the TARGET_ASM_CAN_OUTPUT_MI_THUNK hook.  */
 166 bool
 167 hook_bool_const_tree_hwi_hwi_const_tree_false (const_tree a ATTRIBUTE_UNUSED,
 168                                                HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 169                                                HOST_WIDE_INT c ATTRIBUTE_UNUSED,
 170                                                const_tree d ATTRIBUTE_UNUSED)
 171 {
 172   return false;
 173 }
 174
 175 bool
 176 hook_bool_const_tree_hwi_hwi_const_tree_true (const_tree a ATTRIBUTE_UNUSED,
 177                                               HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 178                                               HOST_WIDE_INT c ATTRIBUTE_UNUSED,
 179                                               const_tree d ATTRIBUTE_UNUSED)
 180 {
 181   return true;
 182 }
 183
 184 bool
 185 default_can_output_mi_thunk_no_vcall (const_tree a ATTRIBUTE_UNUSED,
 186                                       HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 187                                       HOST_WIDE_INT c,
 188                                       const_tree d ATTRIBUTE_UNUSED)
 189 {
 190   return c == 0;
 191 }
 192
 193 int
 194 hook_int_uint_mode_1 (unsigned int a ATTRIBUTE_UNUSED,
 195                       machine_mode b ATTRIBUTE_UNUSED)
 196 {
 197   return 1;
 198 }
 199
 200 int
 201 hook_int_const_tree_0 (const_tree a ATTRIBUTE_UNUSED)
 202 {
 203   return 0;
 204 }
 205
 206 /* ??? Used for comp_type_attributes, which ought to return bool.  */
 207 int
 208 hook_int_const_tree_const_tree_1 (const_tree a ATTRIBUTE_UNUSED, const_tree b ATTRIBUTE_UNUSED)
 209 {
 210   return 1;
 211 }
 212
 213 int
 214 hook_int_rtx_0 (rtx a ATTRIBUTE_UNUSED)
 215 {
 216   return 0;
 217 }
 218
 219 int
 220 hook_int_rtx_1 (rtx)
 221 {
 222   return 1;
 223 }
 224
 225 int
 226 hook_int_rtx_insn_unreachable (rtx_insn *)
 227 {
 228   gcc_unreachable ();
 229 }
 230
 231 int
 232 hook_int_rtx_bool_0 (rtx a ATTRIBUTE_UNUSED, bool b ATTRIBUTE_UNUSED)
 233 {
 234   return 0;
 235 }
 236
 237 int
 238 hook_int_rtx_mode_as_bool_0 (rtx, machine_mode, addr_space_t, bool)
 239 {
 240   return 0;
 241 }
 242
 243 unsigned int
 244 hook_uint_void_0 (void)
 245 {
 246   return 0;
 247 }
 248
 249 void
 250 hook_void_tree (tree a ATTRIBUTE_UNUSED)
 251 {
 252 }
 253
 254 void
 255 hook_void_rtx_tree (rtx, tree)
 256 {
 257 }
 258
 259 void
 260 hook_void_constcharptr (const char *a ATTRIBUTE_UNUSED)
 261 {
 262 }
 263
 264 void
 265 hook_void_tree_treeptr (tree a ATTRIBUTE_UNUSED, tree *b ATTRIBUTE_UNUSED)
 266 {
 267 }
 268
 269 void
 270 hook_void_int_int (int a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 271 {
 272 }
 273
 274 bool
 275 hook_bool_tree_false (tree a ATTRIBUTE_UNUSED)
 276 {
 277   return false;
 278 }
 279
 280 bool
 281 hook_bool_const_tree_false (const_tree a ATTRIBUTE_UNUSED)
 282 {
 283   return false;
 284 }
 285
 286 bool
 287 hook_bool_tree_true (tree a ATTRIBUTE_UNUSED)
 288 {
 289   return true;
 290 }
 291
 292 bool
 293 hook_bool_const_tree_true (const_tree a ATTRIBUTE_UNUSED)
 294 {
 295   return true;
 296 }
 297
 298 bool
 299 hook_bool_tree_tree_false (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 300 {
 301   return false;
 302 }
 303
 304 bool
 305 hook_bool_tree_tree_true (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 306 {
 307   return true;
 308 }
 309
 310 bool
 311 hook_bool_tree_bool_false (tree a ATTRIBUTE_UNUSED, bool b ATTRIBUTE_UNUSED)
 312 {
 313   return false;
 314 }
 315
 316 bool
 317 hook_bool_rtx_insn_true (rtx_insn *insn ATTRIBUTE_UNUSED)
 318 {
 319   return true;
 320 }
 321
 322 bool
 323 hook_bool_rtx_false (rtx a ATTRIBUTE_UNUSED)
 324 {
 325   return false;
 326 }
 327
 328 bool
 329 hook_bool_uintp_uintp_false (unsigned int *a ATTRIBUTE_UNUSED,
 330                              unsigned int *b ATTRIBUTE_UNUSED)
 331 {
 332   return false;
 333 }
 334
 335 bool
 336 hook_bool_rtx_int_int_int_intp_bool_false (rtx a ATTRIBUTE_UNUSED,
 337                                            int b ATTRIBUTE_UNUSED,
 338                                            int c ATTRIBUTE_UNUSED,
 339                                            int d ATTRIBUTE_UNUSED,
 340                                            int *e ATTRIBUTE_UNUSED,
 341                                            bool speed_p ATTRIBUTE_UNUSED)
 342 {
 343   return false;
 344 }
 345
 346 bool
 347 hook_bool_wint_wint_uint_bool_true (const widest_int &, const widest_int &,
 348                                     unsigned int, bool)
 349 {
 350   return true;
 351 }
 352
 353 /* Generic hook that takes an rtx and returns it.  */
 354 rtx
 355 hook_rtx_rtx_identity (rtx x)
 356 {
 357   return x;
 358 }
 359
 360 /* Generic hook that takes an rtx and returns NULL_RTX.  */
 361 rtx
 362 hook_rtx_rtx_null (rtx x ATTRIBUTE_UNUSED)
 363 {
 364   return NULL;
 365 }
 366
 367 /* Generic hook that takes a tree and an int and returns NULL_RTX.  */
 368 rtx
 369 hook_rtx_tree_int_null (tree a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 370 {
 371   return NULL;
 372 }
 373
 374 /* Generic hook that takes a machine mode and returns an unsigned int 0.  */
 375 unsigned int
 376 hook_uint_mode_0 (machine_mode m ATTRIBUTE_UNUSED)
 377 {
 378   return 0;
 379 }
 380
 381 /* Generic hook that takes three trees and returns the last one as is.  */
 382 tree
 383 hook_tree_tree_tree_tree_3rd_identity (tree a ATTRIBUTE_UNUSED,
 384                                        tree b ATTRIBUTE_UNUSED, tree c)
 385 {
 386   return c;
 387 }
 388
 389 /* Generic hook that takes no arguments and returns a NULL const string.  */
 390 const char *
 391 hook_constcharptr_void_null (void)
 392 {
 393   return NULL;
 394 }
 395
 396 /* Generic hook that takes no arguments and returns a NULL string.  */
 397 char *
 398 hook_charptr_void_null (void)
 399 {
 400   return NULL;
 401 }
 402
 403 /* Generic hook that takes a tree and returns a NULL string.  */
 404 const char *
 405 hook_constcharptr_const_tree_null (const_tree t ATTRIBUTE_UNUSED)
 406 {
 407   return NULL;
 408 }
 409
 410 tree
 411 hook_tree_tree_int_treep_bool_null (tree t0 ATTRIBUTE_UNUSED,
 412                                     int i ATTRIBUTE_UNUSED,
 413                                     tree *p ATTRIBUTE_UNUSED,
 414                                     bool ignore ATTRIBUTE_UNUSED)
 415 {
 416   return NULL;
 417 }
 418
 419 tree
 420 hook_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED, tree t1 ATTRIBUTE_UNUSED)
 421 {
 422   return NULL;
 423 }
 424
 425 tree
 426 hook_tree_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED,
 427                                tree t1 ATTRIBUTE_UNUSED,
 428                                tree t2 ATTRIBUTE_UNUSED)
 429 {
 430   return NULL;
 431 }
 432
 433 /* Generic hook that takes an rtx_insn *and returns a NULL string.  */
 434 const char *
 435 hook_constcharptr_const_rtx_insn_null (const rtx_insn *insn ATTRIBUTE_UNUSED)
 436 {
 437   return NULL;
 438 }
 439
 440 const char *
 441 hook_constcharptr_const_tree_const_tree_null (const_tree t0 ATTRIBUTE_UNUSED,
 442                                               const_tree t1 ATTRIBUTE_UNUSED)
 443 {
 444   return NULL;
 445 }
 446
 447 const char *
 448 hook_constcharptr_int_const_tree_null (int i ATTRIBUTE_UNUSED,
 449                                        const_tree t0 ATTRIBUTE_UNUSED)
 450 {
 451   return NULL;
 452 }
 453
 454 const char *
 455 hook_constcharptr_int_const_tree_const_tree_null (int i ATTRIBUTE_UNUSED,
 456                                                   const_tree t0 ATTRIBUTE_UNUSED,
 457                                                   const_tree t1 ATTRIBUTE_UNUSED)
 458 {
 459   return NULL;
 460 }
 461
 462 /* Generic hook that takes a const_tree and returns NULL_TREE.  */
 463 tree
 464 hook_tree_const_tree_null (const_tree t ATTRIBUTE_UNUSED)
 465 {
 466   return NULL;
 467 }
 468
 469 /* Generic hook that takes a rtx_insn * and an int and returns a bool.  */
 470
 471 bool
 472 hook_bool_rtx_insn_int_false (rtx_insn *insn ATTRIBUTE_UNUSED,
 473                               int mode ATTRIBUTE_UNUSED)
 474 {
 475   return false;
 476 }
 477
 478 /* Generic hook that takes a rtx_insn * and an int and returns void.  */
 479
 480 void
 481 hook_void_rtx_insn_int (rtx_insn *insn ATTRIBUTE_UNUSED,
 482                         int mode ATTRIBUTE_UNUSED)
 483 {
 484 }
 485
 486 /* Generic hook that takes a struct gcc_options * and returns void.  */
 487
 488 void
 489 hook_void_gcc_optionsp (struct gcc_options *opts ATTRIBUTE_UNUSED)
 490 {
 491 }