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 (enum machine_mode) and returns false.  */
  60 bool
  61 hook_bool_mode_false (enum machine_mode mode ATTRIBUTE_UNUSED)
  62 {
  63   return false;
  64 }
  65
  66 /* Generic hook that takes (enum machine_mode, rtx) and returns false.  */
  67 bool
  68 hook_bool_mode_const_rtx_false (enum machine_mode mode ATTRIBUTE_UNUSED,
  69                                 const_rtx value ATTRIBUTE_UNUSED)
  70 {
  71   return false;
  72 }
  73
  74 /* Generic hook that takes (enum machine_mode, rtx) and returns true.  */
  75 bool
  76 hook_bool_mode_const_rtx_true (enum machine_mode mode ATTRIBUTE_UNUSED,
  77                                const_rtx value ATTRIBUTE_UNUSED)
  78 {
  79   return true;
  80 }
  81
  82 /* Generic hook that takes (FILE *, const char *) and does nothing.  */
  83 void
  84 hook_void_FILEptr_constcharptr (FILE *a ATTRIBUTE_UNUSED, const char *b ATTRIBUTE_UNUSED)
  85 {
  86 }
  87
  88 /* Used for the TARGET_ASM_CAN_OUTPUT_MI_THUNK hook.  */
  89 bool
  90 hook_bool_const_tree_hwi_hwi_const_tree_false (const_tree a ATTRIBUTE_UNUSED,
  91                                                HOST_WIDE_INT b ATTRIBUTE_UNUSED,
  92                                                HOST_WIDE_INT c ATTRIBUTE_UNUSED,
  93                                                const_tree d ATTRIBUTE_UNUSED)
  94 {
  95   return false;
  96 }
  97
  98 bool
  99 hook_bool_const_tree_hwi_hwi_const_tree_true (const_tree a ATTRIBUTE_UNUSED,
 100                                               HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 101                                               HOST_WIDE_INT c ATTRIBUTE_UNUSED,
 102                                               const_tree d ATTRIBUTE_UNUSED)
 103 {
 104   return true;
 105 }
 106
 107 bool
 108 hook_bool_constcharptr_size_t_false (const char *a ATTRIBUTE_UNUSED,
 109                                      size_t b ATTRIBUTE_UNUSED)
 110 {
 111   return false;
 112 }
 113
 114 bool
 115 hook_bool_size_t_constcharptr_int_true (size_t a ATTRIBUTE_UNUSED,
 116                                         const char *b ATTRIBUTE_UNUSED,
 117                                         int c ATTRIBUTE_UNUSED)
 118 {
 119   return true;
 120 }
 121
 122 bool
 123 default_can_output_mi_thunk_no_vcall (const_tree a ATTRIBUTE_UNUSED,
 124                                       HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 125                                       HOST_WIDE_INT c,
 126                                       const_tree d ATTRIBUTE_UNUSED)
 127 {
 128   return c == 0;
 129 }
 130
 131 int
 132 hook_int_const_tree_0 (const_tree a ATTRIBUTE_UNUSED)
 133 {
 134   return 0;
 135 }
 136
 137 /* ??? Used for comp_type_attributes, which ought to return bool.  */
 138 int
 139 hook_int_const_tree_const_tree_1 (const_tree a ATTRIBUTE_UNUSED, const_tree b ATTRIBUTE_UNUSED)
 140 {
 141   return 1;
 142 }
 143
 144 int
 145 hook_int_rtx_0 (rtx a ATTRIBUTE_UNUSED)
 146 {
 147   return 0;
 148 }
 149
 150 int
 151 hook_int_rtx_bool_0 (rtx a ATTRIBUTE_UNUSED, bool b ATTRIBUTE_UNUSED)
 152 {
 153   return 0;
 154 }
 155
 156 int
 157 hook_int_size_t_constcharptr_int_0 (size_t a ATTRIBUTE_UNUSED,
 158                                     const char *b ATTRIBUTE_UNUSED,
 159                                     int c ATTRIBUTE_UNUSED)
 160 {
 161   return 0;
 162 }
 163
 164 unsigned int
 165 hook_uint_uint_constcharptrptr_0 (unsigned int a ATTRIBUTE_UNUSED,
 166                                   const char **b ATTRIBUTE_UNUSED)
 167 {
 168   return 0;
 169 }
 170
 171 void
 172 hook_void_tree (tree a ATTRIBUTE_UNUSED)
 173 {
 174 }
 175
 176 void
 177 hook_void_constcharptr (const char *a ATTRIBUTE_UNUSED)
 178 {
 179 }
 180
 181 void
 182 hook_void_tree_treeptr (tree a ATTRIBUTE_UNUSED, tree *b ATTRIBUTE_UNUSED)
 183 {
 184 }
 185
 186 bool
 187 hook_bool_tree_false (tree a ATTRIBUTE_UNUSED)
 188 {
 189   return false;
 190 }
 191
 192 bool
 193 hook_bool_const_tree_false (const_tree a ATTRIBUTE_UNUSED)
 194 {
 195   return false;
 196 }
 197
 198 bool
 199 hook_bool_tree_true (tree a ATTRIBUTE_UNUSED)
 200 {
 201   return true;
 202 }
 203
 204 bool
 205 hook_bool_const_tree_true (const_tree a ATTRIBUTE_UNUSED)
 206 {
 207   return true;
 208 }
 209
 210 bool
 211 hook_bool_tree_tree_false (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 212 {
 213   return false;
 214 }
 215
 216 bool
 217 hook_bool_tree_bool_false (tree a ATTRIBUTE_UNUSED, bool b ATTRIBUTE_UNUSED)
 218 {
 219   return false;
 220 }
 221
 222 bool
 223 hook_bool_rtx_false (rtx a ATTRIBUTE_UNUSED)
 224 {
 225   return false;
 226 }
 227
 228 bool
 229 hook_bool_uintp_uintp_false (unsigned int *a ATTRIBUTE_UNUSED,
 230                              unsigned int *b ATTRIBUTE_UNUSED)
 231 {
 232   return false;
 233 }
 234
 235 bool
 236 hook_bool_rtx_int_int_intp_bool_false (rtx a ATTRIBUTE_UNUSED,
 237                                        int b ATTRIBUTE_UNUSED,
 238                                        int c ATTRIBUTE_UNUSED,
 239                                        int *d ATTRIBUTE_UNUSED,
 240                                        bool speed_p ATTRIBUTE_UNUSED)
 241 {
 242   return false;
 243 }
 244
 245 /* Generic hook that takes an rtx and returns it.  */
 246 rtx
 247 hook_rtx_rtx_identity (rtx x)
 248 {
 249   return x;
 250 }
 251
 252 /* Generic hook that takes an rtx and returns NULL_RTX.  */
 253 rtx
 254 hook_rtx_rtx_null (rtx x ATTRIBUTE_UNUSED)
 255 {
 256   return NULL;
 257 }
 258
 259 /* Generic hook that takes a tree and an int and returns NULL_RTX.  */
 260 rtx
 261 hook_rtx_tree_int_null (tree a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 262 {
 263   return NULL;
 264 }
 265
 266 /* Generic hook that takes three trees and returns the last one as is.  */
 267 tree
 268 hook_tree_tree_tree_tree_3rd_identity (tree a ATTRIBUTE_UNUSED,
 269                                        tree b ATTRIBUTE_UNUSED, tree c)
 270 {
 271   return c;
 272 }
 273
 274 /* Generic hook that takes a tree and returns a NULL string.  */
 275 const char *
 276 hook_constcharptr_const_tree_null (const_tree t ATTRIBUTE_UNUSED)
 277 {
 278   return NULL;
 279 }
 280
 281 tree
 282 hook_tree_tree_tree_bool_null (tree t0 ATTRIBUTE_UNUSED,
 283                                tree t1 ATTRIBUTE_UNUSED,
 284                                bool ignore ATTRIBUTE_UNUSED)
 285 {
 286   return NULL;
 287 }
 288
 289 tree
 290 hook_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED, tree t1 ATTRIBUTE_UNUSED)
 291 {
 292   return NULL;
 293 }
 294
 295 tree
 296 hook_tree_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED,
 297                                tree t1 ATTRIBUTE_UNUSED,
 298                                tree t2 ATTRIBUTE_UNUSED)
 299 {
 300   return NULL;
 301 }
 302
 303 /* Generic hook that takes a rtx and returns a NULL string.  */
 304 const char *
 305 hook_constcharptr_const_rtx_null (const_rtx r ATTRIBUTE_UNUSED)
 306 {
 307   return NULL;
 308 }
 309
 310 const char *
 311 hook_constcharptr_const_tree_const_tree_null (const_tree t0 ATTRIBUTE_UNUSED,
 312                                               const_tree t1 ATTRIBUTE_UNUSED)
 313 {
 314   return NULL;
 315 }
 316
 317 const char *
 318 hook_constcharptr_int_const_tree_null (int i ATTRIBUTE_UNUSED,
 319                                        const_tree t0 ATTRIBUTE_UNUSED)
 320 {
 321   return NULL;
 322 }
 323
 324 const char *
 325 hook_constcharptr_int_const_tree_const_tree_null (int i ATTRIBUTE_UNUSED,
 326                                                   const_tree t0 ATTRIBUTE_UNUSED,
 327                                                   const_tree t1 ATTRIBUTE_UNUSED)
 328 {
 329   return NULL;
 330 }
 331
 332 /* Generic hook that takes a const_tree and returns NULL_TREE.  */
 333 tree
 334 hook_tree_const_tree_null (const_tree t ATTRIBUTE_UNUSED)
 335 {
 336   return NULL;
 337 }