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 (enum machine_mode) and returns false.  */
  74 bool
  75 hook_bool_mode_false (enum machine_mode mode ATTRIBUTE_UNUSED)
  76 {
  77   return false;
  78 }
  79
  80 /* Generic hook that takes (enum machine_mode) and returns true.  */
  81 bool
  82 hook_bool_mode_true (enum machine_mode mode ATTRIBUTE_UNUSED)
  83 {
  84   return true;
  85 }
  86
  87 /* Generic hook that takes (enum machine_mode, const_rtx) and returns false.  */
  88 bool
  89 hook_bool_mode_const_rtx_false (enum machine_mode mode ATTRIBUTE_UNUSED,
  90                                 const_rtx value ATTRIBUTE_UNUSED)
  91 {
  92   return false;
  93 }
  94
  95 /* Generic hook that takes (enum machine_mode, const_rtx) and returns true.  */
  96 bool
  97 hook_bool_mode_const_rtx_true (enum machine_mode mode ATTRIBUTE_UNUSED,
  98                                const_rtx value ATTRIBUTE_UNUSED)
  99 {
 100   return true;
 101 }
 102
 103 /* Generic hook that takes (enum machine_mode, rtx) and returns false.  */
 104 bool
 105 hook_bool_mode_rtx_false (enum machine_mode mode ATTRIBUTE_UNUSED,
 106                           rtx value ATTRIBUTE_UNUSED)
 107 {
 108   return false;
 109 }
 110
 111 /* Generic hook that takes (enum machine_mode, rtx) and returns true.  */
 112 bool
 113 hook_bool_mode_rtx_true (enum machine_mode mode ATTRIBUTE_UNUSED,
 114                          rtx value ATTRIBUTE_UNUSED)
 115 {
 116   return true;
 117 }
 118
 119 /* Generic hook that takes (rtx, rtx) and returns true.  */
 120 bool
 121 hook_bool_const_rtx_const_rtx_true (const_rtx follower ATTRIBUTE_UNUSED,
 122                                     const_rtx followee ATTRIBUTE_UNUSED)
 123 {
 124   return true;
 125 }
 126
 127 /* Generic hook that takes (enum machine_mode, unsigned HOST_WIDE_INT)
 128    and returns false.  */
 129 bool
 130 hook_bool_mode_uhwi_false (enum 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                       enum 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_unreachable (rtx)
 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, enum 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_true (rtx a 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_dint_dint_uint_bool_true (double_int, double_int, unsigned int, bool)
 336 {
 337   return true;
 338 }
 339
 340 /* Generic hook that takes an rtx and returns it.  */
 341 rtx
 342 hook_rtx_rtx_identity (rtx x)
 343 {
 344   return x;
 345 }
 346
 347 /* Generic hook that takes an rtx and returns NULL_RTX.  */
 348 rtx
 349 hook_rtx_rtx_null (rtx x ATTRIBUTE_UNUSED)
 350 {
 351   return NULL;
 352 }
 353
 354 /* Generic hook that takes a tree and an int and returns NULL_RTX.  */
 355 rtx
 356 hook_rtx_tree_int_null (tree a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 357 {
 358   return NULL;
 359 }
 360
 361 /* Generic hook that takes a machine mode and returns an unsigned int 0.  */
 362 unsigned int
 363 hook_uint_mode_0 (enum machine_mode m ATTRIBUTE_UNUSED)
 364 {
 365   return 0;
 366 }
 367
 368 /* Generic hook that takes three trees and returns the last one as is.  */
 369 tree
 370 hook_tree_tree_tree_tree_3rd_identity (tree a ATTRIBUTE_UNUSED,
 371                                        tree b ATTRIBUTE_UNUSED, tree c)
 372 {
 373   return c;
 374 }
 375
 376 /* Generic hook that takes no arguments and returns a NULL string.  */
 377 const char *
 378 hook_constcharptr_void_null (void)
 379 {
 380   return NULL;
 381 }
 382
 383 /* Generic hook that takes a tree and returns a NULL string.  */
 384 const char *
 385 hook_constcharptr_const_tree_null (const_tree t ATTRIBUTE_UNUSED)
 386 {
 387   return NULL;
 388 }
 389
 390 tree
 391 hook_tree_tree_int_treep_bool_null (tree t0 ATTRIBUTE_UNUSED,
 392                                     int i ATTRIBUTE_UNUSED,
 393                                     tree *p ATTRIBUTE_UNUSED,
 394                                     bool ignore ATTRIBUTE_UNUSED)
 395 {
 396   return NULL;
 397 }
 398
 399 tree
 400 hook_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED, tree t1 ATTRIBUTE_UNUSED)
 401 {
 402   return NULL;
 403 }
 404
 405 tree
 406 hook_tree_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED,
 407                                tree t1 ATTRIBUTE_UNUSED,
 408                                tree t2 ATTRIBUTE_UNUSED)
 409 {
 410   return NULL;
 411 }
 412
 413 /* Generic hook that takes a rtx and returns a NULL string.  */
 414 const char *
 415 hook_constcharptr_const_rtx_null (const_rtx r ATTRIBUTE_UNUSED)
 416 {
 417   return NULL;
 418 }
 419
 420 const char *
 421 hook_constcharptr_const_tree_const_tree_null (const_tree t0 ATTRIBUTE_UNUSED,
 422                                               const_tree t1 ATTRIBUTE_UNUSED)
 423 {
 424   return NULL;
 425 }
 426
 427 const char *
 428 hook_constcharptr_int_const_tree_null (int i ATTRIBUTE_UNUSED,
 429                                        const_tree t0 ATTRIBUTE_UNUSED)
 430 {
 431   return NULL;
 432 }
 433
 434 const char *
 435 hook_constcharptr_int_const_tree_const_tree_null (int i ATTRIBUTE_UNUSED,
 436                                                   const_tree t0 ATTRIBUTE_UNUSED,
 437                                                   const_tree t1 ATTRIBUTE_UNUSED)
 438 {
 439   return NULL;
 440 }
 441
 442 /* Generic hook that takes a const_tree and returns NULL_TREE.  */
 443 tree
 444 hook_tree_const_tree_null (const_tree t ATTRIBUTE_UNUSED)
 445 {
 446   return NULL;
 447 }
 448
 449 /* Generic hook that takes a rtx and an int and returns a bool.  */
 450
 451 bool
 452 hook_bool_rtx_int_false (rtx insn ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
 453 {
 454   return false;
 455 }
 456
 457 /* Generic hook that takes a rtx and an int and returns void.  */
 458
 459 void
 460 hook_void_rtx_int (rtx insn ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
 461 {
 462 }
 463
 464 /* Generic hook that takes a struct gcc_options * and returns void.  */
 465
 466 void
 467 hook_void_gcc_optionsp (struct gcc_options *opts ATTRIBUTE_UNUSED)
 468 {
 469 }