gcc/hooks.c

   1 /* General-purpose hooks.
   2    Copyright (C) 2002, 2003, 2004, 2005, 2007, 2008, 2009
   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_uint_constcharptrptr_0 (unsigned int a ATTRIBUTE_UNUSED,
 180                                   const char **b ATTRIBUTE_UNUSED)
 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 bool
 201 hook_bool_tree_false (tree a ATTRIBUTE_UNUSED)
 202 {
 203   return false;
 204 }
 205
 206 bool
 207 hook_bool_const_tree_false (const_tree a ATTRIBUTE_UNUSED)
 208 {
 209   return false;
 210 }
 211
 212 bool
 213 hook_bool_tree_true (tree a ATTRIBUTE_UNUSED)
 214 {
 215   return true;
 216 }
 217
 218 bool
 219 hook_bool_const_tree_true (const_tree a ATTRIBUTE_UNUSED)
 220 {
 221   return true;
 222 }
 223
 224 bool
 225 hook_bool_tree_tree_false (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 226 {
 227   return false;
 228 }
 229
 230 bool
 231 hook_bool_tree_tree_true (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 232 {
 233   return true;
 234 }
 235
 236 bool
 237 hook_bool_tree_bool_false (tree a ATTRIBUTE_UNUSED, bool b ATTRIBUTE_UNUSED)
 238 {
 239   return false;
 240 }
 241
 242 bool
 243 hook_bool_rtx_false (rtx a ATTRIBUTE_UNUSED)
 244 {
 245   return false;
 246 }
 247
 248 bool
 249 hook_bool_uintp_uintp_false (unsigned int *a ATTRIBUTE_UNUSED,
 250                              unsigned int *b ATTRIBUTE_UNUSED)
 251 {
 252   return false;
 253 }
 254
 255 bool
 256 hook_bool_rtx_int_int_intp_bool_false (rtx a ATTRIBUTE_UNUSED,
 257                                        int b ATTRIBUTE_UNUSED,
 258                                        int c ATTRIBUTE_UNUSED,
 259                                        int *d ATTRIBUTE_UNUSED,
 260                                        bool speed_p ATTRIBUTE_UNUSED)
 261 {
 262   return false;
 263 }
 264
 265 /* Generic hook that takes an rtx and returns it.  */
 266 rtx
 267 hook_rtx_rtx_identity (rtx x)
 268 {
 269   return x;
 270 }
 271
 272 /* Generic hook that takes an rtx and returns NULL_RTX.  */
 273 rtx
 274 hook_rtx_rtx_null (rtx x ATTRIBUTE_UNUSED)
 275 {
 276   return NULL;
 277 }
 278
 279 /* Generic hook that takes a tree and an int and returns NULL_RTX.  */
 280 rtx
 281 hook_rtx_tree_int_null (tree a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 282 {
 283   return NULL;
 284 }
 285
 286 /* Generic hook that takes three trees and returns the last one as is.  */
 287 tree
 288 hook_tree_tree_tree_tree_3rd_identity (tree a ATTRIBUTE_UNUSED,
 289                                        tree b ATTRIBUTE_UNUSED, tree c)
 290 {
 291   return c;
 292 }
 293
 294 /* Generic hook that takes a tree and returns a NULL string.  */
 295 const char *
 296 hook_constcharptr_const_tree_null (const_tree t ATTRIBUTE_UNUSED)
 297 {
 298   return NULL;
 299 }
 300
 301 tree
 302 hook_tree_tree_int_treep_bool_null (tree t0 ATTRIBUTE_UNUSED,
 303                                     int i ATTRIBUTE_UNUSED,
 304                                     tree *p ATTRIBUTE_UNUSED,
 305                                     bool ignore ATTRIBUTE_UNUSED)
 306 {
 307   return NULL;
 308 }
 309
 310 tree
 311 hook_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED, tree t1 ATTRIBUTE_UNUSED)
 312 {
 313   return NULL;
 314 }
 315
 316 tree
 317 hook_tree_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED,
 318                                tree t1 ATTRIBUTE_UNUSED,
 319                                tree t2 ATTRIBUTE_UNUSED)
 320 {
 321   return NULL;
 322 }
 323
 324 /* Generic hook that takes a rtx and returns a NULL string.  */
 325 const char *
 326 hook_constcharptr_const_rtx_null (const_rtx r ATTRIBUTE_UNUSED)
 327 {
 328   return NULL;
 329 }
 330
 331 const char *
 332 hook_constcharptr_const_tree_const_tree_null (const_tree t0 ATTRIBUTE_UNUSED,
 333                                               const_tree t1 ATTRIBUTE_UNUSED)
 334 {
 335   return NULL;
 336 }
 337
 338 const char *
 339 hook_constcharptr_int_const_tree_null (int i ATTRIBUTE_UNUSED,
 340                                        const_tree t0 ATTRIBUTE_UNUSED)
 341 {
 342   return NULL;
 343 }
 344
 345 const char *
 346 hook_constcharptr_int_const_tree_const_tree_null (int i ATTRIBUTE_UNUSED,
 347                                                   const_tree t0 ATTRIBUTE_UNUSED,
 348                                                   const_tree t1 ATTRIBUTE_UNUSED)
 349 {
 350   return NULL;
 351 }
 352
 353 /* Generic hook that takes a const_tree and returns NULL_TREE.  */
 354 tree
 355 hook_tree_const_tree_null (const_tree t ATTRIBUTE_UNUSED)
 356 {
 357   return NULL;
 358 }