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_uint_mode_1 (unsigned int a ATTRIBUTE_UNUSED,
 165                       enum machine_mode b ATTRIBUTE_UNUSED)
 166 {
 167   return 1;
 168 }
 169
 170 int
 171 hook_int_const_tree_0 (const_tree a ATTRIBUTE_UNUSED)
 172 {
 173   return 0;
 174 }
 175
 176 /* ??? Used for comp_type_attributes, which ought to return bool.  */
 177 int
 178 hook_int_const_tree_const_tree_1 (const_tree a ATTRIBUTE_UNUSED, const_tree b ATTRIBUTE_UNUSED)
 179 {
 180   return 1;
 181 }
 182
 183 int
 184 hook_int_rtx_0 (rtx a ATTRIBUTE_UNUSED)
 185 {
 186   return 0;
 187 }
 188
 189 int
 190 hook_int_rtx_bool_0 (rtx a ATTRIBUTE_UNUSED, bool b ATTRIBUTE_UNUSED)
 191 {
 192   return 0;
 193 }
 194
 195 unsigned int
 196 hook_uint_void_0 (void)
 197 {
 198   return 0;
 199 }
 200
 201 void
 202 hook_void_tree (tree a ATTRIBUTE_UNUSED)
 203 {
 204 }
 205
 206 void
 207 hook_void_constcharptr (const char *a ATTRIBUTE_UNUSED)
 208 {
 209 }
 210
 211 void
 212 hook_void_tree_treeptr (tree a ATTRIBUTE_UNUSED, tree *b ATTRIBUTE_UNUSED)
 213 {
 214 }
 215
 216 void
 217 hook_void_int_int (int a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 218 {
 219 }
 220
 221 bool
 222 hook_bool_tree_false (tree a ATTRIBUTE_UNUSED)
 223 {
 224   return false;
 225 }
 226
 227 bool
 228 hook_bool_const_tree_false (const_tree a ATTRIBUTE_UNUSED)
 229 {
 230   return false;
 231 }
 232
 233 bool
 234 hook_bool_tree_true (tree a ATTRIBUTE_UNUSED)
 235 {
 236   return true;
 237 }
 238
 239 bool
 240 hook_bool_const_tree_true (const_tree a ATTRIBUTE_UNUSED)
 241 {
 242   return true;
 243 }
 244
 245 bool
 246 hook_bool_tree_tree_false (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 247 {
 248   return false;
 249 }
 250
 251 bool
 252 hook_bool_tree_tree_true (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 253 {
 254   return true;
 255 }
 256
 257 bool
 258 hook_bool_tree_bool_false (tree a ATTRIBUTE_UNUSED, bool b ATTRIBUTE_UNUSED)
 259 {
 260   return false;
 261 }
 262
 263 bool
 264 hook_bool_rtx_false (rtx a ATTRIBUTE_UNUSED)
 265 {
 266   return false;
 267 }
 268
 269 bool
 270 hook_bool_uintp_uintp_false (unsigned int *a ATTRIBUTE_UNUSED,
 271                              unsigned int *b ATTRIBUTE_UNUSED)
 272 {
 273   return false;
 274 }
 275
 276 bool
 277 hook_bool_rtx_int_int_int_intp_bool_false (rtx a ATTRIBUTE_UNUSED,
 278                                            int b ATTRIBUTE_UNUSED,
 279                                            int c ATTRIBUTE_UNUSED,
 280                                            int d ATTRIBUTE_UNUSED,
 281                                            int *e ATTRIBUTE_UNUSED,
 282                                            bool speed_p ATTRIBUTE_UNUSED)
 283 {
 284   return false;
 285 }
 286
 287 /* Generic hook that takes an rtx and returns it.  */
 288 rtx
 289 hook_rtx_rtx_identity (rtx x)
 290 {
 291   return x;
 292 }
 293
 294 /* Generic hook that takes an rtx and returns NULL_RTX.  */
 295 rtx
 296 hook_rtx_rtx_null (rtx x ATTRIBUTE_UNUSED)
 297 {
 298   return NULL;
 299 }
 300
 301 /* Generic hook that takes a tree and an int and returns NULL_RTX.  */
 302 rtx
 303 hook_rtx_tree_int_null (tree a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 304 {
 305   return NULL;
 306 }
 307
 308 /* Generic hook that takes three trees and returns the last one as is.  */
 309 tree
 310 hook_tree_tree_tree_tree_3rd_identity (tree a ATTRIBUTE_UNUSED,
 311                                        tree b ATTRIBUTE_UNUSED, tree c)
 312 {
 313   return c;
 314 }
 315
 316 /* Generic hook that takes a tree and returns a NULL string.  */
 317 const char *
 318 hook_constcharptr_const_tree_null (const_tree t ATTRIBUTE_UNUSED)
 319 {
 320   return NULL;
 321 }
 322
 323 tree
 324 hook_tree_tree_int_treep_bool_null (tree t0 ATTRIBUTE_UNUSED,
 325                                     int i ATTRIBUTE_UNUSED,
 326                                     tree *p ATTRIBUTE_UNUSED,
 327                                     bool ignore ATTRIBUTE_UNUSED)
 328 {
 329   return NULL;
 330 }
 331
 332 tree
 333 hook_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED, tree t1 ATTRIBUTE_UNUSED)
 334 {
 335   return NULL;
 336 }
 337
 338 tree
 339 hook_tree_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED,
 340                                tree t1 ATTRIBUTE_UNUSED,
 341                                tree t2 ATTRIBUTE_UNUSED)
 342 {
 343   return NULL;
 344 }
 345
 346 /* Generic hook that takes a rtx and returns a NULL string.  */
 347 const char *
 348 hook_constcharptr_const_rtx_null (const_rtx r ATTRIBUTE_UNUSED)
 349 {
 350   return NULL;
 351 }
 352
 353 const char *
 354 hook_constcharptr_const_tree_const_tree_null (const_tree t0 ATTRIBUTE_UNUSED,
 355                                               const_tree t1 ATTRIBUTE_UNUSED)
 356 {
 357   return NULL;
 358 }
 359
 360 const char *
 361 hook_constcharptr_int_const_tree_null (int i ATTRIBUTE_UNUSED,
 362                                        const_tree t0 ATTRIBUTE_UNUSED)
 363 {
 364   return NULL;
 365 }
 366
 367 const char *
 368 hook_constcharptr_int_const_tree_const_tree_null (int i ATTRIBUTE_UNUSED,
 369                                                   const_tree t0 ATTRIBUTE_UNUSED,
 370                                                   const_tree t1 ATTRIBUTE_UNUSED)
 371 {
 372   return NULL;
 373 }
 374
 375 /* Generic hook that takes a const_tree and returns NULL_TREE.  */
 376 tree
 377 hook_tree_const_tree_null (const_tree t ATTRIBUTE_UNUSED)
 378 {
 379   return NULL;
 380 }
 381
 382 /* Generic hook that takes a rtx and an int and returns a bool.  */
 383
 384 bool
 385 hook_bool_rtx_int_false (rtx insn ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
 386 {
 387   return false;
 388 }
 389
 390 /* Generic hook that takes a rtx and an int and returns void.  */
 391
 392 void
 393 hook_void_rtx_int (rtx insn ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
 394 {
 395 }
 396
 397 /* Generic hook that takes a struct gcc_options * and returns void.  */
 398
 399 void
 400 hook_void_gcc_optionsp (struct gcc_options *opts ATTRIBUTE_UNUSED)
 401 {
 402 }