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