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