gcc/hooks.c

   1 /* General-purpose hooks.
   2    Copyright (C) 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010
   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, 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, 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 (FILE *, const char *) and does nothing.  */
 105 void
 106 hook_void_FILEptr_constcharptr (FILE *a ATTRIBUTE_UNUSED, const char *b ATTRIBUTE_UNUSED)
 107 {
 108 }
 109
 110 /* Used for the TARGET_ASM_CAN_OUTPUT_MI_THUNK hook.  */
 111 bool
 112 hook_bool_const_tree_hwi_hwi_const_tree_false (const_tree a ATTRIBUTE_UNUSED,
 113                                                HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 114                                                HOST_WIDE_INT c ATTRIBUTE_UNUSED,
 115                                                const_tree d ATTRIBUTE_UNUSED)
 116 {
 117   return false;
 118 }
 119
 120 bool
 121 hook_bool_const_tree_hwi_hwi_const_tree_true (const_tree a ATTRIBUTE_UNUSED,
 122                                               HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 123                                               HOST_WIDE_INT c ATTRIBUTE_UNUSED,
 124                                               const_tree d ATTRIBUTE_UNUSED)
 125 {
 126   return true;
 127 }
 128
 129 bool
 130 hook_bool_size_t_constcharptr_int_true (size_t a ATTRIBUTE_UNUSED,
 131                                         const char *b ATTRIBUTE_UNUSED,
 132                                         int c ATTRIBUTE_UNUSED)
 133 {
 134   return true;
 135 }
 136
 137 bool
 138 default_can_output_mi_thunk_no_vcall (const_tree a ATTRIBUTE_UNUSED,
 139                                       HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 140                                       HOST_WIDE_INT c,
 141                                       const_tree d ATTRIBUTE_UNUSED)
 142 {
 143   return c == 0;
 144 }
 145
 146 int
 147 hook_int_const_tree_0 (const_tree a ATTRIBUTE_UNUSED)
 148 {
 149   return 0;
 150 }
 151
 152 /* ??? Used for comp_type_attributes, which ought to return bool.  */
 153 int
 154 hook_int_const_tree_const_tree_1 (const_tree a ATTRIBUTE_UNUSED, const_tree b ATTRIBUTE_UNUSED)
 155 {
 156   return 1;
 157 }
 158
 159 int
 160 hook_int_rtx_0 (rtx a ATTRIBUTE_UNUSED)
 161 {
 162   return 0;
 163 }
 164
 165 int
 166 hook_int_rtx_bool_0 (rtx a ATTRIBUTE_UNUSED, bool b ATTRIBUTE_UNUSED)
 167 {
 168   return 0;
 169 }
 170
 171 unsigned int
 172 hook_uint_void_0 (void)
 173 {
 174   return 0;
 175 }
 176
 177 void
 178 hook_void_tree (tree a ATTRIBUTE_UNUSED)
 179 {
 180 }
 181
 182 void
 183 hook_void_constcharptr (const char *a ATTRIBUTE_UNUSED)
 184 {
 185 }
 186
 187 void
 188 hook_void_tree_treeptr (tree a ATTRIBUTE_UNUSED, tree *b ATTRIBUTE_UNUSED)
 189 {
 190 }
 191
 192 void
 193 hook_void_int_int (int a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 194 {
 195 }
 196
 197 bool
 198 hook_bool_tree_false (tree a ATTRIBUTE_UNUSED)
 199 {
 200   return false;
 201 }
 202
 203 bool
 204 hook_bool_const_tree_false (const_tree a ATTRIBUTE_UNUSED)
 205 {
 206   return false;
 207 }
 208
 209 bool
 210 hook_bool_tree_true (tree a ATTRIBUTE_UNUSED)
 211 {
 212   return true;
 213 }
 214
 215 bool
 216 hook_bool_const_tree_true (const_tree a ATTRIBUTE_UNUSED)
 217 {
 218   return true;
 219 }
 220
 221 bool
 222 hook_bool_tree_tree_false (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 223 {
 224   return false;
 225 }
 226
 227 bool
 228 hook_bool_tree_tree_true (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 229 {
 230   return true;
 231 }
 232
 233 bool
 234 hook_bool_tree_bool_false (tree a ATTRIBUTE_UNUSED, bool b ATTRIBUTE_UNUSED)
 235 {
 236   return false;
 237 }
 238
 239 bool
 240 hook_bool_rtx_false (rtx a ATTRIBUTE_UNUSED)
 241 {
 242   return false;
 243 }
 244
 245 bool
 246 hook_bool_uintp_uintp_false (unsigned int *a ATTRIBUTE_UNUSED,
 247                              unsigned int *b ATTRIBUTE_UNUSED)
 248 {
 249   return false;
 250 }
 251
 252 bool
 253 hook_bool_rtx_int_int_intp_bool_false (rtx a ATTRIBUTE_UNUSED,
 254                                        int b ATTRIBUTE_UNUSED,
 255                                        int c ATTRIBUTE_UNUSED,
 256                                        int *d ATTRIBUTE_UNUSED,
 257                                        bool speed_p ATTRIBUTE_UNUSED)
 258 {
 259   return false;
 260 }
 261
 262 /* Generic hook that takes an rtx and returns it.  */
 263 rtx
 264 hook_rtx_rtx_identity (rtx x)
 265 {
 266   return x;
 267 }
 268
 269 /* Generic hook that takes an rtx and returns NULL_RTX.  */
 270 rtx
 271 hook_rtx_rtx_null (rtx x ATTRIBUTE_UNUSED)
 272 {
 273   return NULL;
 274 }
 275
 276 /* Generic hook that takes a tree and an int and returns NULL_RTX.  */
 277 rtx
 278 hook_rtx_tree_int_null (tree a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 279 {
 280   return NULL;
 281 }
 282
 283 /* Generic hook that takes three trees and returns the last one as is.  */
 284 tree
 285 hook_tree_tree_tree_tree_3rd_identity (tree a ATTRIBUTE_UNUSED,
 286                                        tree b ATTRIBUTE_UNUSED, tree c)
 287 {
 288   return c;
 289 }
 290
 291 /* Generic hook that takes a tree and returns a NULL string.  */
 292 const char *
 293 hook_constcharptr_const_tree_null (const_tree t ATTRIBUTE_UNUSED)
 294 {
 295   return NULL;
 296 }
 297
 298 tree
 299 hook_tree_tree_int_treep_bool_null (tree t0 ATTRIBUTE_UNUSED,
 300                                     int i ATTRIBUTE_UNUSED,
 301                                     tree *p ATTRIBUTE_UNUSED,
 302                                     bool ignore ATTRIBUTE_UNUSED)
 303 {
 304   return NULL;
 305 }
 306
 307 tree
 308 hook_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED, tree t1 ATTRIBUTE_UNUSED)
 309 {
 310   return NULL;
 311 }
 312
 313 tree
 314 hook_tree_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED,
 315                                tree t1 ATTRIBUTE_UNUSED,
 316                                tree t2 ATTRIBUTE_UNUSED)
 317 {
 318   return NULL;
 319 }
 320
 321 /* Generic hook that takes a rtx and returns a NULL string.  */
 322 const char *
 323 hook_constcharptr_const_rtx_null (const_rtx r ATTRIBUTE_UNUSED)
 324 {
 325   return NULL;
 326 }
 327
 328 const char *
 329 hook_constcharptr_const_tree_const_tree_null (const_tree t0 ATTRIBUTE_UNUSED,
 330                                               const_tree t1 ATTRIBUTE_UNUSED)
 331 {
 332   return NULL;
 333 }
 334
 335 const char *
 336 hook_constcharptr_int_const_tree_null (int i ATTRIBUTE_UNUSED,
 337                                        const_tree t0 ATTRIBUTE_UNUSED)
 338 {
 339   return NULL;
 340 }
 341
 342 const char *
 343 hook_constcharptr_int_const_tree_const_tree_null (int i ATTRIBUTE_UNUSED,
 344                                                   const_tree t0 ATTRIBUTE_UNUSED,
 345                                                   const_tree t1 ATTRIBUTE_UNUSED)
 346 {
 347   return NULL;
 348 }
 349
 350 /* Generic hook that takes a const_tree and returns NULL_TREE.  */
 351 tree
 352 hook_tree_const_tree_null (const_tree t ATTRIBUTE_UNUSED)
 353 {
 354   return NULL;
 355 }
 356
 357 /* Generic hook that takes a rtx and an int and returns a bool.  */
 358
 359 bool
 360 hook_bool_rtx_int_false (rtx insn ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
 361 {
 362   return false;
 363 }
 364
 365 /* Generic hook that takes a rtx and an int and returns void.  */
 366
 367 void
 368 hook_void_rtx_int (rtx insn ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
 369 {
 370 }
 371
 372 /* Generic hook that takes a struct gcc_options * and returns void.  */
 373
 374 void
 375 hook_void_gcc_optionsp (struct gcc_options *opts ATTRIBUTE_UNUSED)
 376 {
 377 }