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 const int, const int) and returns true.  */
  60 bool hook_bool_const_int_const_int_true (const int a ATTRIBUTE_UNUSED,
  61                                          const int b ATTRIBUTE_UNUSED)
  62 {
  63   return true;
  64 }
  65
  66 /* Generic hook that takes (enum machine_mode) and returns false.  */
  67 bool
  68 hook_bool_mode_false (enum machine_mode mode ATTRIBUTE_UNUSED)
  69 {
  70   return false;
  71 }
  72
  73 /* Generic hook that takes (enum machine_mode) and returns true.  */
  74 bool
  75 hook_bool_mode_true (enum machine_mode mode ATTRIBUTE_UNUSED)
  76 {
  77   return true;
  78 }
  79
  80 /* Generic hook that takes (enum machine_mode, rtx) and returns false.  */
  81 bool
  82 hook_bool_mode_const_rtx_false (enum machine_mode mode ATTRIBUTE_UNUSED,
  83                                 const_rtx value ATTRIBUTE_UNUSED)
  84 {
  85   return false;
  86 }
  87
  88 /* Generic hook that takes (enum machine_mode, rtx) and returns true.  */
  89 bool
  90 hook_bool_mode_const_rtx_true (enum machine_mode mode ATTRIBUTE_UNUSED,
  91                                const_rtx value ATTRIBUTE_UNUSED)
  92 {
  93   return true;
  94 }
  95
  96 /* Generic hook that takes (FILE *, const char *) and does nothing.  */
  97 void
  98 hook_void_FILEptr_constcharptr (FILE *a ATTRIBUTE_UNUSED, const char *b ATTRIBUTE_UNUSED)
  99 {
 100 }
 101
 102 /* Used for the TARGET_ASM_CAN_OUTPUT_MI_THUNK hook.  */
 103 bool
 104 hook_bool_const_tree_hwi_hwi_const_tree_false (const_tree a ATTRIBUTE_UNUSED,
 105                                                HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 106                                                HOST_WIDE_INT c ATTRIBUTE_UNUSED,
 107                                                const_tree d ATTRIBUTE_UNUSED)
 108 {
 109   return false;
 110 }
 111
 112 bool
 113 hook_bool_const_tree_hwi_hwi_const_tree_true (const_tree a ATTRIBUTE_UNUSED,
 114                                               HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 115                                               HOST_WIDE_INT c ATTRIBUTE_UNUSED,
 116                                               const_tree d ATTRIBUTE_UNUSED)
 117 {
 118   return true;
 119 }
 120
 121 bool
 122 hook_bool_constcharptr_size_t_false (const char *a ATTRIBUTE_UNUSED,
 123                                      size_t b ATTRIBUTE_UNUSED)
 124 {
 125   return false;
 126 }
 127
 128 bool
 129 hook_bool_size_t_constcharptr_int_true (size_t a ATTRIBUTE_UNUSED,
 130                                         const char *b ATTRIBUTE_UNUSED,
 131                                         int c ATTRIBUTE_UNUSED)
 132 {
 133   return true;
 134 }
 135
 136 bool
 137 default_can_output_mi_thunk_no_vcall (const_tree a ATTRIBUTE_UNUSED,
 138                                       HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 139                                       HOST_WIDE_INT c,
 140                                       const_tree d ATTRIBUTE_UNUSED)
 141 {
 142   return c == 0;
 143 }
 144
 145 int
 146 hook_int_const_tree_0 (const_tree a ATTRIBUTE_UNUSED)
 147 {
 148   return 0;
 149 }
 150
 151 /* ??? Used for comp_type_attributes, which ought to return bool.  */
 152 int
 153 hook_int_const_tree_const_tree_1 (const_tree a ATTRIBUTE_UNUSED, const_tree b ATTRIBUTE_UNUSED)
 154 {
 155   return 1;
 156 }
 157
 158 int
 159 hook_int_rtx_0 (rtx a ATTRIBUTE_UNUSED)
 160 {
 161   return 0;
 162 }
 163
 164 int
 165 hook_int_rtx_bool_0 (rtx a ATTRIBUTE_UNUSED, bool b ATTRIBUTE_UNUSED)
 166 {
 167   return 0;
 168 }
 169
 170 int
 171 hook_int_size_t_constcharptr_int_0 (size_t a ATTRIBUTE_UNUSED,
 172                                     const char *b ATTRIBUTE_UNUSED,
 173                                     int c ATTRIBUTE_UNUSED)
 174 {
 175   return 0;
 176 }
 177
 178 unsigned int
 179 hook_uint_void_0 (void)
 180 {
 181   return 0;
 182 }
 183
 184 void
 185 hook_void_tree (tree a ATTRIBUTE_UNUSED)
 186 {
 187 }
 188
 189 void
 190 hook_void_constcharptr (const char *a ATTRIBUTE_UNUSED)
 191 {
 192 }
 193
 194 void
 195 hook_void_tree_treeptr (tree a ATTRIBUTE_UNUSED, tree *b ATTRIBUTE_UNUSED)
 196 {
 197 }
 198
 199 bool
 200 hook_bool_tree_false (tree a ATTRIBUTE_UNUSED)
 201 {
 202   return false;
 203 }
 204
 205 bool
 206 hook_bool_const_tree_false (const_tree a ATTRIBUTE_UNUSED)
 207 {
 208   return false;
 209 }
 210
 211 bool
 212 hook_bool_tree_true (tree a ATTRIBUTE_UNUSED)
 213 {
 214   return true;
 215 }
 216
 217 bool
 218 hook_bool_const_tree_true (const_tree a ATTRIBUTE_UNUSED)
 219 {
 220   return true;
 221 }
 222
 223 bool
 224 hook_bool_tree_tree_false (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 225 {
 226   return false;
 227 }
 228
 229 bool
 230 hook_bool_tree_tree_true (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 231 {
 232   return true;
 233 }
 234
 235 bool
 236 hook_bool_tree_bool_false (tree a ATTRIBUTE_UNUSED, bool b ATTRIBUTE_UNUSED)
 237 {
 238   return false;
 239 }
 240
 241 bool
 242 hook_bool_rtx_false (rtx a ATTRIBUTE_UNUSED)
 243 {
 244   return false;
 245 }
 246
 247 bool
 248 hook_bool_uintp_uintp_false (unsigned int *a ATTRIBUTE_UNUSED,
 249                              unsigned int *b ATTRIBUTE_UNUSED)
 250 {
 251   return false;
 252 }
 253
 254 bool
 255 hook_bool_rtx_int_int_intp_bool_false (rtx a ATTRIBUTE_UNUSED,
 256                                        int b ATTRIBUTE_UNUSED,
 257                                        int c ATTRIBUTE_UNUSED,
 258                                        int *d ATTRIBUTE_UNUSED,
 259                                        bool speed_p ATTRIBUTE_UNUSED)
 260 {
 261   return false;
 262 }
 263
 264 /* Generic hook that takes an rtx and returns it.  */
 265 rtx
 266 hook_rtx_rtx_identity (rtx x)
 267 {
 268   return x;
 269 }
 270
 271 /* Generic hook that takes an rtx and returns NULL_RTX.  */
 272 rtx
 273 hook_rtx_rtx_null (rtx x ATTRIBUTE_UNUSED)
 274 {
 275   return NULL;
 276 }
 277
 278 /* Generic hook that takes a tree and an int and returns NULL_RTX.  */
 279 rtx
 280 hook_rtx_tree_int_null (tree a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 281 {
 282   return NULL;
 283 }
 284
 285 /* Generic hook that takes three trees and returns the last one as is.  */
 286 tree
 287 hook_tree_tree_tree_tree_3rd_identity (tree a ATTRIBUTE_UNUSED,
 288                                        tree b ATTRIBUTE_UNUSED, tree c)
 289 {
 290   return c;
 291 }
 292
 293 /* Generic hook that takes a tree and returns a NULL string.  */
 294 const char *
 295 hook_constcharptr_const_tree_null (const_tree t ATTRIBUTE_UNUSED)
 296 {
 297   return NULL;
 298 }
 299
 300 tree
 301 hook_tree_tree_int_treep_bool_null (tree t0 ATTRIBUTE_UNUSED,
 302                                     int i ATTRIBUTE_UNUSED,
 303                                     tree *p ATTRIBUTE_UNUSED,
 304                                     bool ignore ATTRIBUTE_UNUSED)
 305 {
 306   return NULL;
 307 }
 308
 309 tree
 310 hook_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED, tree t1 ATTRIBUTE_UNUSED)
 311 {
 312   return NULL;
 313 }
 314
 315 tree
 316 hook_tree_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED,
 317                                tree t1 ATTRIBUTE_UNUSED,
 318                                tree t2 ATTRIBUTE_UNUSED)
 319 {
 320   return NULL;
 321 }
 322
 323 /* Generic hook that takes a rtx and returns a NULL string.  */
 324 const char *
 325 hook_constcharptr_const_rtx_null (const_rtx r ATTRIBUTE_UNUSED)
 326 {
 327   return NULL;
 328 }
 329
 330 const char *
 331 hook_constcharptr_const_tree_const_tree_null (const_tree t0 ATTRIBUTE_UNUSED,
 332                                               const_tree t1 ATTRIBUTE_UNUSED)
 333 {
 334   return NULL;
 335 }
 336
 337 const char *
 338 hook_constcharptr_int_const_tree_null (int i ATTRIBUTE_UNUSED,
 339                                        const_tree t0 ATTRIBUTE_UNUSED)
 340 {
 341   return NULL;
 342 }
 343
 344 const char *
 345 hook_constcharptr_int_const_tree_const_tree_null (int i ATTRIBUTE_UNUSED,
 346                                                   const_tree t0 ATTRIBUTE_UNUSED,
 347                                                   const_tree t1 ATTRIBUTE_UNUSED)
 348 {
 349   return NULL;
 350 }
 351
 352 /* Generic hook that takes a const_tree and returns NULL_TREE.  */
 353 tree
 354 hook_tree_const_tree_null (const_tree t ATTRIBUTE_UNUSED)
 355 {
 356   return NULL;
 357 }