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 /* Generic hook that takes (FILE *, rtx) and returns false.  */
 136 bool
 137 hook_bool_FILEptr_rtx_false (FILE *a ATTRIBUTE_UNUSED,
 138                              rtx b ATTRIBUTE_UNUSED)
 139 {
 140   return false;
 141 }
 142
 143 /* Used for the TARGET_ASM_CAN_OUTPUT_MI_THUNK hook.  */
 144 bool
 145 hook_bool_const_tree_hwi_hwi_const_tree_false (const_tree a ATTRIBUTE_UNUSED,
 146                                                HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 147                                                HOST_WIDE_INT c ATTRIBUTE_UNUSED,
 148                                                const_tree d ATTRIBUTE_UNUSED)
 149 {
 150   return false;
 151 }
 152
 153 bool
 154 hook_bool_const_tree_hwi_hwi_const_tree_true (const_tree a ATTRIBUTE_UNUSED,
 155                                               HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 156                                               HOST_WIDE_INT c ATTRIBUTE_UNUSED,
 157                                               const_tree d ATTRIBUTE_UNUSED)
 158 {
 159   return true;
 160 }
 161
 162 bool
 163 default_can_output_mi_thunk_no_vcall (const_tree a ATTRIBUTE_UNUSED,
 164                                       HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 165                                       HOST_WIDE_INT c,
 166                                       const_tree d ATTRIBUTE_UNUSED)
 167 {
 168   return c == 0;
 169 }
 170
 171 int
 172 hook_int_uint_mode_1 (unsigned int a ATTRIBUTE_UNUSED,
 173                       enum machine_mode b ATTRIBUTE_UNUSED)
 174 {
 175   return 1;
 176 }
 177
 178 int
 179 hook_int_const_tree_0 (const_tree a ATTRIBUTE_UNUSED)
 180 {
 181   return 0;
 182 }
 183
 184 /* ??? Used for comp_type_attributes, which ought to return bool.  */
 185 int
 186 hook_int_const_tree_const_tree_1 (const_tree a ATTRIBUTE_UNUSED, const_tree b ATTRIBUTE_UNUSED)
 187 {
 188   return 1;
 189 }
 190
 191 int
 192 hook_int_rtx_0 (rtx a ATTRIBUTE_UNUSED)
 193 {
 194   return 0;
 195 }
 196
 197 int
 198 hook_int_rtx_bool_0 (rtx a ATTRIBUTE_UNUSED, bool b ATTRIBUTE_UNUSED)
 199 {
 200   return 0;
 201 }
 202
 203 unsigned int
 204 hook_uint_void_0 (void)
 205 {
 206   return 0;
 207 }
 208
 209 void
 210 hook_void_tree (tree a ATTRIBUTE_UNUSED)
 211 {
 212 }
 213
 214 void
 215 hook_void_constcharptr (const char *a ATTRIBUTE_UNUSED)
 216 {
 217 }
 218
 219 void
 220 hook_void_tree_treeptr (tree a ATTRIBUTE_UNUSED, tree *b ATTRIBUTE_UNUSED)
 221 {
 222 }
 223
 224 void
 225 hook_void_int_int (int a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 226 {
 227 }
 228
 229 bool
 230 hook_bool_tree_false (tree a ATTRIBUTE_UNUSED)
 231 {
 232   return false;
 233 }
 234
 235 bool
 236 hook_bool_const_tree_false (const_tree a ATTRIBUTE_UNUSED)
 237 {
 238   return false;
 239 }
 240
 241 bool
 242 hook_bool_tree_true (tree a ATTRIBUTE_UNUSED)
 243 {
 244   return true;
 245 }
 246
 247 bool
 248 hook_bool_const_tree_true (const_tree a ATTRIBUTE_UNUSED)
 249 {
 250   return true;
 251 }
 252
 253 bool
 254 hook_bool_tree_tree_false (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 255 {
 256   return false;
 257 }
 258
 259 bool
 260 hook_bool_tree_tree_true (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 261 {
 262   return true;
 263 }
 264
 265 bool
 266 hook_bool_tree_bool_false (tree a ATTRIBUTE_UNUSED, bool b ATTRIBUTE_UNUSED)
 267 {
 268   return false;
 269 }
 270
 271 bool
 272 hook_bool_rtx_false (rtx a ATTRIBUTE_UNUSED)
 273 {
 274   return false;
 275 }
 276
 277 bool
 278 hook_bool_uintp_uintp_false (unsigned int *a ATTRIBUTE_UNUSED,
 279                              unsigned int *b ATTRIBUTE_UNUSED)
 280 {
 281   return false;
 282 }
 283
 284 bool
 285 hook_bool_rtx_int_int_int_intp_bool_false (rtx a ATTRIBUTE_UNUSED,
 286                                            int b ATTRIBUTE_UNUSED,
 287                                            int c ATTRIBUTE_UNUSED,
 288                                            int d ATTRIBUTE_UNUSED,
 289                                            int *e ATTRIBUTE_UNUSED,
 290                                            bool speed_p ATTRIBUTE_UNUSED)
 291 {
 292   return false;
 293 }
 294
 295 /* Generic hook that takes an rtx and returns it.  */
 296 rtx
 297 hook_rtx_rtx_identity (rtx x)
 298 {
 299   return x;
 300 }
 301
 302 /* Generic hook that takes an rtx and returns NULL_RTX.  */
 303 rtx
 304 hook_rtx_rtx_null (rtx x ATTRIBUTE_UNUSED)
 305 {
 306   return NULL;
 307 }
 308
 309 /* Generic hook that takes a tree and an int and returns NULL_RTX.  */
 310 rtx
 311 hook_rtx_tree_int_null (tree a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 312 {
 313   return NULL;
 314 }
 315
 316 /* Generic hook that takes three trees and returns the last one as is.  */
 317 tree
 318 hook_tree_tree_tree_tree_3rd_identity (tree a ATTRIBUTE_UNUSED,
 319                                        tree b ATTRIBUTE_UNUSED, tree c)
 320 {
 321   return c;
 322 }
 323
 324 /* Generic hook that takes a tree and returns a NULL string.  */
 325 const char *
 326 hook_constcharptr_const_tree_null (const_tree t ATTRIBUTE_UNUSED)
 327 {
 328   return NULL;
 329 }
 330
 331 tree
 332 hook_tree_tree_int_treep_bool_null (tree t0 ATTRIBUTE_UNUSED,
 333                                     int i ATTRIBUTE_UNUSED,
 334                                     tree *p ATTRIBUTE_UNUSED,
 335                                     bool ignore ATTRIBUTE_UNUSED)
 336 {
 337   return NULL;
 338 }
 339
 340 tree
 341 hook_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED, tree t1 ATTRIBUTE_UNUSED)
 342 {
 343   return NULL;
 344 }
 345
 346 tree
 347 hook_tree_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED,
 348                                tree t1 ATTRIBUTE_UNUSED,
 349                                tree t2 ATTRIBUTE_UNUSED)
 350 {
 351   return NULL;
 352 }
 353
 354 /* Generic hook that takes a rtx and returns a NULL string.  */
 355 const char *
 356 hook_constcharptr_const_rtx_null (const_rtx r ATTRIBUTE_UNUSED)
 357 {
 358   return NULL;
 359 }
 360
 361 const char *
 362 hook_constcharptr_const_tree_const_tree_null (const_tree t0 ATTRIBUTE_UNUSED,
 363                                               const_tree t1 ATTRIBUTE_UNUSED)
 364 {
 365   return NULL;
 366 }
 367
 368 const char *
 369 hook_constcharptr_int_const_tree_null (int i ATTRIBUTE_UNUSED,
 370                                        const_tree t0 ATTRIBUTE_UNUSED)
 371 {
 372   return NULL;
 373 }
 374
 375 const char *
 376 hook_constcharptr_int_const_tree_const_tree_null (int i ATTRIBUTE_UNUSED,
 377                                                   const_tree t0 ATTRIBUTE_UNUSED,
 378                                                   const_tree t1 ATTRIBUTE_UNUSED)
 379 {
 380   return NULL;
 381 }
 382
 383 /* Generic hook that takes a const_tree and returns NULL_TREE.  */
 384 tree
 385 hook_tree_const_tree_null (const_tree t ATTRIBUTE_UNUSED)
 386 {
 387   return NULL;
 388 }
 389
 390 /* Generic hook that takes a rtx and an int and returns a bool.  */
 391
 392 bool
 393 hook_bool_rtx_int_false (rtx insn ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
 394 {
 395   return false;
 396 }
 397
 398 /* Generic hook that takes a rtx and an int and returns void.  */
 399
 400 void
 401 hook_void_rtx_int (rtx insn ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
 402 {
 403 }
 404
 405 /* Generic hook that takes a struct gcc_options * and returns void.  */
 406
 407 void
 408 hook_void_gcc_optionsp (struct gcc_options *opts ATTRIBUTE_UNUSED)
 409 {
 410 }