gcc/hooks.c

   1 /* General-purpose hooks.
   2    Copyright (C) 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011, 2012
   3    Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify it
   6    under the terms of the GNU General Public License as published by the
   7    Free Software Foundation; either version 3, or (at your option) any
   8    later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; see the file COPYING3.  If not see
  17    <http://www.gnu.org/licenses/>.
  18
  19    In other words, you are welcome to use, share and improve this program.
  20    You are forbidden to forbid anyone else to use, share and improve
  21    what you give them.   Help stamp out software-hoarding!  */
  22
  23 /* This file contains generic hooks that can be used as defaults for
  24    target or language-dependent hook initializers.  */
  25
  26 #include "config.h"
  27 #include "system.h"
  28 #include "coretypes.h"
  29 #include "tm.h"
  30 #include "hooks.h"
  31
  32 /* Generic hook that does absolutely zappo.  */
  33 void
  34 hook_void_void (void)
  35 {
  36 }
  37
  38 /* Generic hook that takes no arguments and returns false.  */
  39 bool
  40 hook_bool_void_false (void)
  41 {
  42   return false;
  43 }
  44
  45 /* Generic hook that takes no arguments and returns true.  */
  46 bool
  47 hook_bool_void_true (void)
  48 {
  49   return true;
  50 }
  51
  52 /* Generic hook that takes (bool) and returns false.  */
  53 bool
  54 hook_bool_bool_false (bool a ATTRIBUTE_UNUSED)
  55 {
  56   return false;
  57 }
  58
  59 /* Generic hook that takes (bool, struct gcc_options *) and returns false.  */
  60 bool
  61 hook_bool_bool_gcc_optionsp_false (bool a ATTRIBUTE_UNUSED,
  62                                    struct gcc_options *opts ATTRIBUTE_UNUSED)
  63 {
  64   return false;
  65 }
  66
  67 /* Generic hook that takes const int, const int) and returns true.  */
  68 bool hook_bool_const_int_const_int_true (const int a ATTRIBUTE_UNUSED,
  69                                          const int b ATTRIBUTE_UNUSED)
  70 {
  71   return true;
  72 }
  73
  74 /* Generic hook that takes (enum machine_mode) and returns false.  */
  75 bool
  76 hook_bool_mode_false (enum machine_mode mode ATTRIBUTE_UNUSED)
  77 {
  78   return false;
  79 }
  80
  81 /* Generic hook that takes (enum machine_mode) and returns true.  */
  82 bool
  83 hook_bool_mode_true (enum machine_mode mode ATTRIBUTE_UNUSED)
  84 {
  85   return true;
  86 }
  87
  88 /* Generic hook that takes (enum machine_mode, const_rtx) and returns false.  */
  89 bool
  90 hook_bool_mode_const_rtx_false (enum machine_mode mode ATTRIBUTE_UNUSED,
  91                                 const_rtx value ATTRIBUTE_UNUSED)
  92 {
  93   return false;
  94 }
  95
  96 /* Generic hook that takes (enum machine_mode, const_rtx) and returns true.  */
  97 bool
  98 hook_bool_mode_const_rtx_true (enum machine_mode mode ATTRIBUTE_UNUSED,
  99                                const_rtx value ATTRIBUTE_UNUSED)
 100 {
 101   return true;
 102 }
 103
 104 /* Generic hook that takes (enum machine_mode, rtx) and returns false.  */
 105 bool
 106 hook_bool_mode_rtx_false (enum machine_mode mode ATTRIBUTE_UNUSED,
 107                           rtx value ATTRIBUTE_UNUSED)
 108 {
 109   return false;
 110 }
 111
 112 /* Generic hook that takes (enum machine_mode, rtx) and returns true.  */
 113 bool
 114 hook_bool_mode_rtx_true (enum machine_mode mode ATTRIBUTE_UNUSED,
 115                          rtx value ATTRIBUTE_UNUSED)
 116 {
 117   return true;
 118 }
 119
 120 /* Generic hook that takes (rtx, rtx) and returns true.  */
 121 bool
 122 hook_bool_const_rtx_const_rtx_true (const_rtx follower ATTRIBUTE_UNUSED,
 123                                     const_rtx followee ATTRIBUTE_UNUSED)
 124 {
 125   return true;
 126 }
 127
 128 /* Generic hook that takes (enum machine_mode, unsigned HOST_WIDE_INT)
 129    and returns false.  */
 130 bool
 131 hook_bool_mode_uhwi_false (enum machine_mode mode ATTRIBUTE_UNUSED,
 132                            unsigned HOST_WIDE_INT value ATTRIBUTE_UNUSED)
 133 {
 134   return false;
 135 }
 136
 137 /* Generic hook that takes (FILE *, const char *) and does nothing.  */
 138 void
 139 hook_void_FILEptr_constcharptr (FILE *a ATTRIBUTE_UNUSED, const char *b ATTRIBUTE_UNUSED)
 140 {
 141 }
 142
 143 /* Generic hook that takes (FILE *, rtx) and returns false.  */
 144 bool
 145 hook_bool_FILEptr_rtx_false (FILE *a ATTRIBUTE_UNUSED,
 146                              rtx b ATTRIBUTE_UNUSED)
 147 {
 148   return false;
 149 }
 150
 151 /* Used for the TARGET_ASM_CAN_OUTPUT_MI_THUNK hook.  */
 152 bool
 153 hook_bool_const_tree_hwi_hwi_const_tree_false (const_tree a ATTRIBUTE_UNUSED,
 154                                                HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 155                                                HOST_WIDE_INT c ATTRIBUTE_UNUSED,
 156                                                const_tree d ATTRIBUTE_UNUSED)
 157 {
 158   return false;
 159 }
 160
 161 bool
 162 hook_bool_const_tree_hwi_hwi_const_tree_true (const_tree a ATTRIBUTE_UNUSED,
 163                                               HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 164                                               HOST_WIDE_INT c ATTRIBUTE_UNUSED,
 165                                               const_tree d ATTRIBUTE_UNUSED)
 166 {
 167   return true;
 168 }
 169
 170 bool
 171 default_can_output_mi_thunk_no_vcall (const_tree a ATTRIBUTE_UNUSED,
 172                                       HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 173                                       HOST_WIDE_INT c,
 174                                       const_tree d ATTRIBUTE_UNUSED)
 175 {
 176   return c == 0;
 177 }
 178
 179 int
 180 hook_int_uint_mode_1 (unsigned int a ATTRIBUTE_UNUSED,
 181                       enum machine_mode b ATTRIBUTE_UNUSED)
 182 {
 183   return 1;
 184 }
 185
 186 int
 187 hook_int_const_tree_0 (const_tree a ATTRIBUTE_UNUSED)
 188 {
 189   return 0;
 190 }
 191
 192 /* ??? Used for comp_type_attributes, which ought to return bool.  */
 193 int
 194 hook_int_const_tree_const_tree_1 (const_tree a ATTRIBUTE_UNUSED, const_tree b ATTRIBUTE_UNUSED)
 195 {
 196   return 1;
 197 }
 198
 199 int
 200 hook_int_rtx_0 (rtx a ATTRIBUTE_UNUSED)
 201 {
 202   return 0;
 203 }
 204
 205 int
 206 hook_int_rtx_1 (rtx)
 207 {
 208   return 1;
 209 }
 210
 211 int
 212 hook_int_rtx_unreachable (rtx)
 213 {
 214   gcc_unreachable ();
 215 }
 216
 217 int
 218 hook_int_rtx_bool_0 (rtx a ATTRIBUTE_UNUSED, bool b ATTRIBUTE_UNUSED)
 219 {
 220   return 0;
 221 }
 222
 223 int
 224 hook_int_rtx_mode_as_bool_0 (rtx, enum machine_mode, addr_space_t, bool)
 225 {
 226   return 0;
 227 }
 228
 229 unsigned int
 230 hook_uint_void_0 (void)
 231 {
 232   return 0;
 233 }
 234
 235 void
 236 hook_void_tree (tree a ATTRIBUTE_UNUSED)
 237 {
 238 }
 239
 240 void
 241 hook_void_constcharptr (const char *a ATTRIBUTE_UNUSED)
 242 {
 243 }
 244
 245 void
 246 hook_void_tree_treeptr (tree a ATTRIBUTE_UNUSED, tree *b ATTRIBUTE_UNUSED)
 247 {
 248 }
 249
 250 void
 251 hook_void_int_int (int a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 252 {
 253 }
 254
 255 bool
 256 hook_bool_tree_false (tree a ATTRIBUTE_UNUSED)
 257 {
 258   return false;
 259 }
 260
 261 bool
 262 hook_bool_const_tree_false (const_tree a ATTRIBUTE_UNUSED)
 263 {
 264   return false;
 265 }
 266
 267 bool
 268 hook_bool_tree_true (tree a ATTRIBUTE_UNUSED)
 269 {
 270   return true;
 271 }
 272
 273 bool
 274 hook_bool_const_tree_true (const_tree a ATTRIBUTE_UNUSED)
 275 {
 276   return true;
 277 }
 278
 279 bool
 280 hook_bool_tree_tree_false (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 281 {
 282   return false;
 283 }
 284
 285 bool
 286 hook_bool_tree_tree_true (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 287 {
 288   return true;
 289 }
 290
 291 bool
 292 hook_bool_tree_bool_false (tree a ATTRIBUTE_UNUSED, bool b ATTRIBUTE_UNUSED)
 293 {
 294   return false;
 295 }
 296
 297 bool
 298 hook_bool_rtx_true (rtx a ATTRIBUTE_UNUSED)
 299 {
 300   return true;
 301 }
 302
 303 bool
 304 hook_bool_rtx_false (rtx a ATTRIBUTE_UNUSED)
 305 {
 306   return false;
 307 }
 308
 309 bool
 310 hook_bool_uintp_uintp_false (unsigned int *a ATTRIBUTE_UNUSED,
 311                              unsigned int *b ATTRIBUTE_UNUSED)
 312 {
 313   return false;
 314 }
 315
 316 bool
 317 hook_bool_rtx_int_int_int_intp_bool_false (rtx a ATTRIBUTE_UNUSED,
 318                                            int b ATTRIBUTE_UNUSED,
 319                                            int c ATTRIBUTE_UNUSED,
 320                                            int d ATTRIBUTE_UNUSED,
 321                                            int *e ATTRIBUTE_UNUSED,
 322                                            bool speed_p ATTRIBUTE_UNUSED)
 323 {
 324   return false;
 325 }
 326
 327 /* Generic hook that takes an rtx and returns it.  */
 328 rtx
 329 hook_rtx_rtx_identity (rtx x)
 330 {
 331   return x;
 332 }
 333
 334 /* Generic hook that takes an rtx and returns NULL_RTX.  */
 335 rtx
 336 hook_rtx_rtx_null (rtx x ATTRIBUTE_UNUSED)
 337 {
 338   return NULL;
 339 }
 340
 341 /* Generic hook that takes a tree and an int and returns NULL_RTX.  */
 342 rtx
 343 hook_rtx_tree_int_null (tree a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 344 {
 345   return NULL;
 346 }
 347
 348 /* Generic hook that takes three trees and returns the last one as is.  */
 349 tree
 350 hook_tree_tree_tree_tree_3rd_identity (tree a ATTRIBUTE_UNUSED,
 351                                        tree b ATTRIBUTE_UNUSED, tree c)
 352 {
 353   return c;
 354 }
 355
 356 /* Generic hook that takes no arguments and returns a NULL string.  */
 357 const char *
 358 hook_constcharptr_void_null (void)
 359 {
 360   return NULL;
 361 }
 362
 363 /* Generic hook that takes a tree and returns a NULL string.  */
 364 const char *
 365 hook_constcharptr_const_tree_null (const_tree t ATTRIBUTE_UNUSED)
 366 {
 367   return NULL;
 368 }
 369
 370 tree
 371 hook_tree_tree_int_treep_bool_null (tree t0 ATTRIBUTE_UNUSED,
 372                                     int i ATTRIBUTE_UNUSED,
 373                                     tree *p ATTRIBUTE_UNUSED,
 374                                     bool ignore ATTRIBUTE_UNUSED)
 375 {
 376   return NULL;
 377 }
 378
 379 tree
 380 hook_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED, tree t1 ATTRIBUTE_UNUSED)
 381 {
 382   return NULL;
 383 }
 384
 385 tree
 386 hook_tree_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED,
 387                                tree t1 ATTRIBUTE_UNUSED,
 388                                tree t2 ATTRIBUTE_UNUSED)
 389 {
 390   return NULL;
 391 }
 392
 393 /* Generic hook that takes a rtx and returns a NULL string.  */
 394 const char *
 395 hook_constcharptr_const_rtx_null (const_rtx r ATTRIBUTE_UNUSED)
 396 {
 397   return NULL;
 398 }
 399
 400 const char *
 401 hook_constcharptr_const_tree_const_tree_null (const_tree t0 ATTRIBUTE_UNUSED,
 402                                               const_tree t1 ATTRIBUTE_UNUSED)
 403 {
 404   return NULL;
 405 }
 406
 407 const char *
 408 hook_constcharptr_int_const_tree_null (int i ATTRIBUTE_UNUSED,
 409                                        const_tree t0 ATTRIBUTE_UNUSED)
 410 {
 411   return NULL;
 412 }
 413
 414 const char *
 415 hook_constcharptr_int_const_tree_const_tree_null (int i ATTRIBUTE_UNUSED,
 416                                                   const_tree t0 ATTRIBUTE_UNUSED,
 417                                                   const_tree t1 ATTRIBUTE_UNUSED)
 418 {
 419   return NULL;
 420 }
 421
 422 /* Generic hook that takes a const_tree and returns NULL_TREE.  */
 423 tree
 424 hook_tree_const_tree_null (const_tree t ATTRIBUTE_UNUSED)
 425 {
 426   return NULL;
 427 }
 428
 429 /* Generic hook that takes a rtx and an int and returns a bool.  */
 430
 431 bool
 432 hook_bool_rtx_int_false (rtx insn ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
 433 {
 434   return false;
 435 }
 436
 437 /* Generic hook that takes a rtx and an int and returns void.  */
 438
 439 void
 440 hook_void_rtx_int (rtx insn ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
 441 {
 442 }
 443
 444 /* Generic hook that takes a struct gcc_options * and returns void.  */
 445
 446 void
 447 hook_void_gcc_optionsp (struct gcc_options *opts ATTRIBUTE_UNUSED)
 448 {
 449 }