gcc/hooks.c

   1 /* General-purpose hooks.
   2    Copyright (C) 2002-2013 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 /* Generic hook that takes an rtx and returns it.  */
 335 rtx
 336 hook_rtx_rtx_identity (rtx x)
 337 {
 338   return x;
 339 }
 340
 341 /* Generic hook that takes an rtx and returns NULL_RTX.  */
 342 rtx
 343 hook_rtx_rtx_null (rtx x ATTRIBUTE_UNUSED)
 344 {
 345   return NULL;
 346 }
 347
 348 /* Generic hook that takes a tree and an int and returns NULL_RTX.  */
 349 rtx
 350 hook_rtx_tree_int_null (tree a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 351 {
 352   return NULL;
 353 }
 354
 355 /* Generic hook that takes three trees and returns the last one as is.  */
 356 tree
 357 hook_tree_tree_tree_tree_3rd_identity (tree a ATTRIBUTE_UNUSED,
 358                                        tree b ATTRIBUTE_UNUSED, tree c)
 359 {
 360   return c;
 361 }
 362
 363 /* Generic hook that takes no arguments and returns a NULL string.  */
 364 const char *
 365 hook_constcharptr_void_null (void)
 366 {
 367   return NULL;
 368 }
 369
 370 /* Generic hook that takes a tree and returns a NULL string.  */
 371 const char *
 372 hook_constcharptr_const_tree_null (const_tree t ATTRIBUTE_UNUSED)
 373 {
 374   return NULL;
 375 }
 376
 377 tree
 378 hook_tree_tree_int_treep_bool_null (tree t0 ATTRIBUTE_UNUSED,
 379                                     int i ATTRIBUTE_UNUSED,
 380                                     tree *p ATTRIBUTE_UNUSED,
 381                                     bool ignore ATTRIBUTE_UNUSED)
 382 {
 383   return NULL;
 384 }
 385
 386 tree
 387 hook_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED, tree t1 ATTRIBUTE_UNUSED)
 388 {
 389   return NULL;
 390 }
 391
 392 tree
 393 hook_tree_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED,
 394                                tree t1 ATTRIBUTE_UNUSED,
 395                                tree t2 ATTRIBUTE_UNUSED)
 396 {
 397   return NULL;
 398 }
 399
 400 /* Generic hook that takes a rtx and returns a NULL string.  */
 401 const char *
 402 hook_constcharptr_const_rtx_null (const_rtx r ATTRIBUTE_UNUSED)
 403 {
 404   return NULL;
 405 }
 406
 407 const char *
 408 hook_constcharptr_const_tree_const_tree_null (const_tree t0 ATTRIBUTE_UNUSED,
 409                                               const_tree t1 ATTRIBUTE_UNUSED)
 410 {
 411   return NULL;
 412 }
 413
 414 const char *
 415 hook_constcharptr_int_const_tree_null (int i ATTRIBUTE_UNUSED,
 416                                        const_tree t0 ATTRIBUTE_UNUSED)
 417 {
 418   return NULL;
 419 }
 420
 421 const char *
 422 hook_constcharptr_int_const_tree_const_tree_null (int i ATTRIBUTE_UNUSED,
 423                                                   const_tree t0 ATTRIBUTE_UNUSED,
 424                                                   const_tree t1 ATTRIBUTE_UNUSED)
 425 {
 426   return NULL;
 427 }
 428
 429 /* Generic hook that takes a const_tree and returns NULL_TREE.  */
 430 tree
 431 hook_tree_const_tree_null (const_tree t ATTRIBUTE_UNUSED)
 432 {
 433   return NULL;
 434 }
 435
 436 /* Generic hook that takes a rtx and an int and returns a bool.  */
 437
 438 bool
 439 hook_bool_rtx_int_false (rtx insn ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
 440 {
 441   return false;
 442 }
 443
 444 /* Generic hook that takes a rtx and an int and returns void.  */
 445
 446 void
 447 hook_void_rtx_int (rtx insn ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
 448 {
 449 }
 450
 451 /* Generic hook that takes a struct gcc_options * and returns void.  */
 452
 453 void
 454 hook_void_gcc_optionsp (struct gcc_options *opts ATTRIBUTE_UNUSED)
 455 {
 456 }