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 *, rtx) and returns false.  */
 143 bool
 144 hook_bool_FILEptr_rtx_false (FILE *a ATTRIBUTE_UNUSED,
 145                              rtx b ATTRIBUTE_UNUSED)
 146 {
 147   return false;
 148 }
 149
 150 /* Generic hook that takes (gimple_stmt_iterator *) and returns
 151    false.  */
 152 bool
 153 hook_bool_gsiptr_false (gimple_stmt_iterator *a ATTRIBUTE_UNUSED)
 154 {
 155   return false;
 156 }
 157
 158 /* Used for the TARGET_ASM_CAN_OUTPUT_MI_THUNK hook.  */
 159 bool
 160 hook_bool_const_tree_hwi_hwi_const_tree_false (const_tree a ATTRIBUTE_UNUSED,
 161                                                HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 162                                                HOST_WIDE_INT c ATTRIBUTE_UNUSED,
 163                                                const_tree d ATTRIBUTE_UNUSED)
 164 {
 165   return false;
 166 }
 167
 168 bool
 169 hook_bool_const_tree_hwi_hwi_const_tree_true (const_tree a ATTRIBUTE_UNUSED,
 170                                               HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 171                                               HOST_WIDE_INT c ATTRIBUTE_UNUSED,
 172                                               const_tree d ATTRIBUTE_UNUSED)
 173 {
 174   return true;
 175 }
 176
 177 bool
 178 default_can_output_mi_thunk_no_vcall (const_tree a ATTRIBUTE_UNUSED,
 179                                       HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 180                                       HOST_WIDE_INT c,
 181                                       const_tree d ATTRIBUTE_UNUSED)
 182 {
 183   return c == 0;
 184 }
 185
 186 int
 187 hook_int_uint_mode_1 (unsigned int a ATTRIBUTE_UNUSED,
 188                       machine_mode b ATTRIBUTE_UNUSED)
 189 {
 190   return 1;
 191 }
 192
 193 int
 194 hook_int_const_tree_0 (const_tree a ATTRIBUTE_UNUSED)
 195 {
 196   return 0;
 197 }
 198
 199 /* ??? Used for comp_type_attributes, which ought to return bool.  */
 200 int
 201 hook_int_const_tree_const_tree_1 (const_tree a ATTRIBUTE_UNUSED, const_tree b ATTRIBUTE_UNUSED)
 202 {
 203   return 1;
 204 }
 205
 206 int
 207 hook_int_rtx_0 (rtx a ATTRIBUTE_UNUSED)
 208 {
 209   return 0;
 210 }
 211
 212 int
 213 hook_int_rtx_1 (rtx)
 214 {
 215   return 1;
 216 }
 217
 218 int
 219 hook_int_rtx_insn_unreachable (rtx_insn *)
 220 {
 221   gcc_unreachable ();
 222 }
 223
 224 int
 225 hook_int_rtx_bool_0 (rtx a ATTRIBUTE_UNUSED, bool b ATTRIBUTE_UNUSED)
 226 {
 227   return 0;
 228 }
 229
 230 int
 231 hook_int_rtx_mode_as_bool_0 (rtx, machine_mode, addr_space_t, bool)
 232 {
 233   return 0;
 234 }
 235
 236 unsigned int
 237 hook_uint_void_0 (void)
 238 {
 239   return 0;
 240 }
 241
 242 void
 243 hook_void_tree (tree a ATTRIBUTE_UNUSED)
 244 {
 245 }
 246
 247 void
 248 hook_void_constcharptr (const char *a ATTRIBUTE_UNUSED)
 249 {
 250 }
 251
 252 void
 253 hook_void_tree_treeptr (tree a ATTRIBUTE_UNUSED, tree *b ATTRIBUTE_UNUSED)
 254 {
 255 }
 256
 257 void
 258 hook_void_int_int (int a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 259 {
 260 }
 261
 262 bool
 263 hook_bool_tree_false (tree a ATTRIBUTE_UNUSED)
 264 {
 265   return false;
 266 }
 267
 268 bool
 269 hook_bool_const_tree_false (const_tree a ATTRIBUTE_UNUSED)
 270 {
 271   return false;
 272 }
 273
 274 bool
 275 hook_bool_tree_true (tree a ATTRIBUTE_UNUSED)
 276 {
 277   return true;
 278 }
 279
 280 bool
 281 hook_bool_const_tree_true (const_tree a ATTRIBUTE_UNUSED)
 282 {
 283   return true;
 284 }
 285
 286 bool
 287 hook_bool_tree_tree_false (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 288 {
 289   return false;
 290 }
 291
 292 bool
 293 hook_bool_tree_tree_true (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 294 {
 295   return true;
 296 }
 297
 298 bool
 299 hook_bool_tree_bool_false (tree a ATTRIBUTE_UNUSED, bool b ATTRIBUTE_UNUSED)
 300 {
 301   return false;
 302 }
 303
 304 bool
 305 hook_bool_rtx_insn_true (rtx_insn *insn ATTRIBUTE_UNUSED)
 306 {
 307   return true;
 308 }
 309
 310 bool
 311 hook_bool_rtx_false (rtx a ATTRIBUTE_UNUSED)
 312 {
 313   return false;
 314 }
 315
 316 bool
 317 hook_bool_uintp_uintp_false (unsigned int *a ATTRIBUTE_UNUSED,
 318                              unsigned int *b ATTRIBUTE_UNUSED)
 319 {
 320   return false;
 321 }
 322
 323 bool
 324 hook_bool_rtx_int_int_int_intp_bool_false (rtx a ATTRIBUTE_UNUSED,
 325                                            int b ATTRIBUTE_UNUSED,
 326                                            int c ATTRIBUTE_UNUSED,
 327                                            int d ATTRIBUTE_UNUSED,
 328                                            int *e ATTRIBUTE_UNUSED,
 329                                            bool speed_p ATTRIBUTE_UNUSED)
 330 {
 331   return false;
 332 }
 333
 334 bool
 335 hook_bool_wint_wint_uint_bool_true (const widest_int &, const widest_int &,
 336                                     unsigned int, bool)
 337 {
 338   return true;
 339 }
 340
 341 /* Generic hook that takes an rtx and returns it.  */
 342 rtx
 343 hook_rtx_rtx_identity (rtx x)
 344 {
 345   return x;
 346 }
 347
 348 /* Generic hook that takes an rtx and returns NULL_RTX.  */
 349 rtx
 350 hook_rtx_rtx_null (rtx x ATTRIBUTE_UNUSED)
 351 {
 352   return NULL;
 353 }
 354
 355 /* Generic hook that takes a tree and an int and returns NULL_RTX.  */
 356 rtx
 357 hook_rtx_tree_int_null (tree a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 358 {
 359   return NULL;
 360 }
 361
 362 /* Generic hook that takes a machine mode and returns an unsigned int 0.  */
 363 unsigned int
 364 hook_uint_mode_0 (machine_mode m ATTRIBUTE_UNUSED)
 365 {
 366   return 0;
 367 }
 368
 369 /* Generic hook that takes three trees and returns the last one as is.  */
 370 tree
 371 hook_tree_tree_tree_tree_3rd_identity (tree a ATTRIBUTE_UNUSED,
 372                                        tree b ATTRIBUTE_UNUSED, tree c)
 373 {
 374   return c;
 375 }
 376
 377 /* Generic hook that takes no arguments and returns a NULL string.  */
 378 const char *
 379 hook_constcharptr_void_null (void)
 380 {
 381   return NULL;
 382 }
 383
 384 /* Generic hook that takes a tree and returns a NULL string.  */
 385 const char *
 386 hook_constcharptr_const_tree_null (const_tree t ATTRIBUTE_UNUSED)
 387 {
 388   return NULL;
 389 }
 390
 391 tree
 392 hook_tree_tree_int_treep_bool_null (tree t0 ATTRIBUTE_UNUSED,
 393                                     int i ATTRIBUTE_UNUSED,
 394                                     tree *p ATTRIBUTE_UNUSED,
 395                                     bool ignore ATTRIBUTE_UNUSED)
 396 {
 397   return NULL;
 398 }
 399
 400 tree
 401 hook_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED, tree t1 ATTRIBUTE_UNUSED)
 402 {
 403   return NULL;
 404 }
 405
 406 tree
 407 hook_tree_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED,
 408                                tree t1 ATTRIBUTE_UNUSED,
 409                                tree t2 ATTRIBUTE_UNUSED)
 410 {
 411   return NULL;
 412 }
 413
 414 /* Generic hook that takes an rtx_insn *and returns a NULL string.  */
 415 const char *
 416 hook_constcharptr_const_rtx_insn_null (const rtx_insn *insn ATTRIBUTE_UNUSED)
 417 {
 418   return NULL;
 419 }
 420
 421 const char *
 422 hook_constcharptr_const_tree_const_tree_null (const_tree t0 ATTRIBUTE_UNUSED,
 423                                               const_tree t1 ATTRIBUTE_UNUSED)
 424 {
 425   return NULL;
 426 }
 427
 428 const char *
 429 hook_constcharptr_int_const_tree_null (int i ATTRIBUTE_UNUSED,
 430                                        const_tree t0 ATTRIBUTE_UNUSED)
 431 {
 432   return NULL;
 433 }
 434
 435 const char *
 436 hook_constcharptr_int_const_tree_const_tree_null (int i ATTRIBUTE_UNUSED,
 437                                                   const_tree t0 ATTRIBUTE_UNUSED,
 438                                                   const_tree t1 ATTRIBUTE_UNUSED)
 439 {
 440   return NULL;
 441 }
 442
 443 /* Generic hook that takes a const_tree and returns NULL_TREE.  */
 444 tree
 445 hook_tree_const_tree_null (const_tree t ATTRIBUTE_UNUSED)
 446 {
 447   return NULL;
 448 }
 449
 450 /* Generic hook that takes a rtx_insn * and an int and returns a bool.  */
 451
 452 bool
 453 hook_bool_rtx_insn_int_false (rtx_insn *insn ATTRIBUTE_UNUSED,
 454                               int mode ATTRIBUTE_UNUSED)
 455 {
 456   return false;
 457 }
 458
 459 /* Generic hook that takes a rtx_insn * and an int and returns void.  */
 460
 461 void
 462 hook_void_rtx_insn_int (rtx_insn *insn ATTRIBUTE_UNUSED,
 463                         int mode ATTRIBUTE_UNUSED)
 464 {
 465 }
 466
 467 /* Generic hook that takes a struct gcc_options * and returns void.  */
 468
 469 void
 470 hook_void_gcc_optionsp (struct gcc_options *opts ATTRIBUTE_UNUSED)
 471 {
 472 }