gcc/hooks.c

   1 /* General-purpose hooks.
   2    Copyright (C) 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011
   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 (enum machine_mode, unsigned HOST_WIDE_INT)
 121    and returns false.  */
 122 bool
 123 hook_bool_mode_uhwi_false (enum machine_mode mode ATTRIBUTE_UNUSED,
 124                            unsigned HOST_WIDE_INT value ATTRIBUTE_UNUSED)
 125 {
 126   return false;
 127 }
 128
 129 /* Generic hook that takes (FILE *, const char *) and does nothing.  */
 130 void
 131 hook_void_FILEptr_constcharptr (FILE *a ATTRIBUTE_UNUSED, const char *b ATTRIBUTE_UNUSED)
 132 {
 133 }
 134
 135 /* Used for the TARGET_ASM_CAN_OUTPUT_MI_THUNK hook.  */
 136 bool
 137 hook_bool_const_tree_hwi_hwi_const_tree_false (const_tree a ATTRIBUTE_UNUSED,
 138                                                HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 139                                                HOST_WIDE_INT c ATTRIBUTE_UNUSED,
 140                                                const_tree d ATTRIBUTE_UNUSED)
 141 {
 142   return false;
 143 }
 144
 145 bool
 146 hook_bool_const_tree_hwi_hwi_const_tree_true (const_tree a ATTRIBUTE_UNUSED,
 147                                               HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 148                                               HOST_WIDE_INT c ATTRIBUTE_UNUSED,
 149                                               const_tree d ATTRIBUTE_UNUSED)
 150 {
 151   return true;
 152 }
 153
 154 bool
 155 default_can_output_mi_thunk_no_vcall (const_tree a ATTRIBUTE_UNUSED,
 156                                       HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 157                                       HOST_WIDE_INT c,
 158                                       const_tree d ATTRIBUTE_UNUSED)
 159 {
 160   return c == 0;
 161 }
 162
 163 int
 164 hook_int_const_tree_0 (const_tree a ATTRIBUTE_UNUSED)
 165 {
 166   return 0;
 167 }
 168
 169 /* ??? Used for comp_type_attributes, which ought to return bool.  */
 170 int
 171 hook_int_const_tree_const_tree_1 (const_tree a ATTRIBUTE_UNUSED, const_tree b ATTRIBUTE_UNUSED)
 172 {
 173   return 1;
 174 }
 175
 176 int
 177 hook_int_rtx_0 (rtx a ATTRIBUTE_UNUSED)
 178 {
 179   return 0;
 180 }
 181
 182 int
 183 hook_int_rtx_bool_0 (rtx a ATTRIBUTE_UNUSED, bool b ATTRIBUTE_UNUSED)
 184 {
 185   return 0;
 186 }
 187
 188 unsigned int
 189 hook_uint_void_0 (void)
 190 {
 191   return 0;
 192 }
 193
 194 void
 195 hook_void_tree (tree a ATTRIBUTE_UNUSED)
 196 {
 197 }
 198
 199 void
 200 hook_void_constcharptr (const char *a ATTRIBUTE_UNUSED)
 201 {
 202 }
 203
 204 void
 205 hook_void_tree_treeptr (tree a ATTRIBUTE_UNUSED, tree *b ATTRIBUTE_UNUSED)
 206 {
 207 }
 208
 209 void
 210 hook_void_int_int (int a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 211 {
 212 }
 213
 214 bool
 215 hook_bool_tree_false (tree a ATTRIBUTE_UNUSED)
 216 {
 217   return false;
 218 }
 219
 220 bool
 221 hook_bool_const_tree_false (const_tree a ATTRIBUTE_UNUSED)
 222 {
 223   return false;
 224 }
 225
 226 bool
 227 hook_bool_tree_true (tree a ATTRIBUTE_UNUSED)
 228 {
 229   return true;
 230 }
 231
 232 bool
 233 hook_bool_const_tree_true (const_tree a ATTRIBUTE_UNUSED)
 234 {
 235   return true;
 236 }
 237
 238 bool
 239 hook_bool_tree_tree_false (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 240 {
 241   return false;
 242 }
 243
 244 bool
 245 hook_bool_tree_tree_true (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 246 {
 247   return true;
 248 }
 249
 250 bool
 251 hook_bool_tree_bool_false (tree a ATTRIBUTE_UNUSED, bool b ATTRIBUTE_UNUSED)
 252 {
 253   return false;
 254 }
 255
 256 bool
 257 hook_bool_rtx_false (rtx a ATTRIBUTE_UNUSED)
 258 {
 259   return false;
 260 }
 261
 262 bool
 263 hook_bool_uintp_uintp_false (unsigned int *a ATTRIBUTE_UNUSED,
 264                              unsigned int *b ATTRIBUTE_UNUSED)
 265 {
 266   return false;
 267 }
 268
 269 bool
 270 hook_bool_rtx_int_int_int_intp_bool_false (rtx a ATTRIBUTE_UNUSED,
 271                                            int b ATTRIBUTE_UNUSED,
 272                                            int c ATTRIBUTE_UNUSED,
 273                                            int d ATTRIBUTE_UNUSED,
 274                                            int *e ATTRIBUTE_UNUSED,
 275                                            bool speed_p ATTRIBUTE_UNUSED)
 276 {
 277   return false;
 278 }
 279
 280 /* Generic hook that takes an rtx and returns it.  */
 281 rtx
 282 hook_rtx_rtx_identity (rtx x)
 283 {
 284   return x;
 285 }
 286
 287 /* Generic hook that takes an rtx and returns NULL_RTX.  */
 288 rtx
 289 hook_rtx_rtx_null (rtx x ATTRIBUTE_UNUSED)
 290 {
 291   return NULL;
 292 }
 293
 294 /* Generic hook that takes a tree and an int and returns NULL_RTX.  */
 295 rtx
 296 hook_rtx_tree_int_null (tree a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 297 {
 298   return NULL;
 299 }
 300
 301 /* Generic hook that takes three trees and returns the last one as is.  */
 302 tree
 303 hook_tree_tree_tree_tree_3rd_identity (tree a ATTRIBUTE_UNUSED,
 304                                        tree b ATTRIBUTE_UNUSED, tree c)
 305 {
 306   return c;
 307 }
 308
 309 /* Generic hook that takes a tree and returns a NULL string.  */
 310 const char *
 311 hook_constcharptr_const_tree_null (const_tree t ATTRIBUTE_UNUSED)
 312 {
 313   return NULL;
 314 }
 315
 316 tree
 317 hook_tree_tree_int_treep_bool_null (tree t0 ATTRIBUTE_UNUSED,
 318                                     int i ATTRIBUTE_UNUSED,
 319                                     tree *p ATTRIBUTE_UNUSED,
 320                                     bool ignore ATTRIBUTE_UNUSED)
 321 {
 322   return NULL;
 323 }
 324
 325 tree
 326 hook_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED, tree t1 ATTRIBUTE_UNUSED)
 327 {
 328   return NULL;
 329 }
 330
 331 tree
 332 hook_tree_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED,
 333                                tree t1 ATTRIBUTE_UNUSED,
 334                                tree t2 ATTRIBUTE_UNUSED)
 335 {
 336   return NULL;
 337 }
 338
 339 /* Generic hook that takes a rtx and returns a NULL string.  */
 340 const char *
 341 hook_constcharptr_const_rtx_null (const_rtx r ATTRIBUTE_UNUSED)
 342 {
 343   return NULL;
 344 }
 345
 346 const char *
 347 hook_constcharptr_const_tree_const_tree_null (const_tree t0 ATTRIBUTE_UNUSED,
 348                                               const_tree t1 ATTRIBUTE_UNUSED)
 349 {
 350   return NULL;
 351 }
 352
 353 const char *
 354 hook_constcharptr_int_const_tree_null (int i ATTRIBUTE_UNUSED,
 355                                        const_tree t0 ATTRIBUTE_UNUSED)
 356 {
 357   return NULL;
 358 }
 359
 360 const char *
 361 hook_constcharptr_int_const_tree_const_tree_null (int i ATTRIBUTE_UNUSED,
 362                                                   const_tree t0 ATTRIBUTE_UNUSED,
 363                                                   const_tree t1 ATTRIBUTE_UNUSED)
 364 {
 365   return NULL;
 366 }
 367
 368 /* Generic hook that takes a const_tree and returns NULL_TREE.  */
 369 tree
 370 hook_tree_const_tree_null (const_tree t ATTRIBUTE_UNUSED)
 371 {
 372   return NULL;
 373 }
 374
 375 /* Generic hook that takes a rtx and an int and returns a bool.  */
 376
 377 bool
 378 hook_bool_rtx_int_false (rtx insn ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
 379 {
 380   return false;
 381 }
 382
 383 /* Generic hook that takes a rtx and an int and returns void.  */
 384
 385 void
 386 hook_void_rtx_int (rtx insn ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
 387 {
 388 }
 389
 390 /* Generic hook that takes a struct gcc_options * and returns void.  */
 391
 392 void
 393 hook_void_gcc_optionsp (struct gcc_options *opts ATTRIBUTE_UNUSED)
 394 {
 395 }