gcc/hooks.c

   1 /* General-purpose hooks.
   2    Copyright (C) 2002, 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify it
   5    under the terms of the GNU General Public License as published by the
   6    Free Software Foundation; either version 3, or (at your option) any
   7    later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; see the file COPYING3.  If not see
  16    <http://www.gnu.org/licenses/>.
  17
  18    In other words, you are welcome to use, share and improve this program.
  19    You are forbidden to forbid anyone else to use, share and improve
  20    what you give them.   Help stamp out software-hoarding!  */
  21
  22 /* This file contains generic hooks that can be used as defaults for
  23    target or language-dependent hook initializers.  */
  24
  25 #include "config.h"
  26 #include "system.h"
  27 #include "coretypes.h"
  28 #include "tm.h"
  29 #include "hooks.h"
  30
  31 /* Generic hook that does absolutely zappo.  */
  32 void
  33 hook_void_void (void)
  34 {
  35 }
  36
  37 /* Generic hook that takes no arguments and returns false.  */
  38 bool
  39 hook_bool_void_false (void)
  40 {
  41   return false;
  42 }
  43
  44 /* Generic hook that takes no arguments and returns true.  */
  45 bool
  46 hook_bool_void_true (void)
  47 {
  48   return true;
  49 }
  50
  51 /* Generic hook that takes no arguments and returns NO_REGS.  */
  52 int
  53 hook_int_void_no_regs (void)
  54 {
  55   return NO_REGS;
  56 }
  57
  58 /* Generic hook that takes (bool) and returns false.  */
  59 bool
  60 hook_bool_bool_false (bool a ATTRIBUTE_UNUSED)
  61 {
  62   return false;
  63 }
  64
  65 /* Generic hook that takes (enum machine_mode) and returns false.  */
  66 bool
  67 hook_bool_mode_false (enum machine_mode mode ATTRIBUTE_UNUSED)
  68 {
  69   return false;
  70 }
  71
  72 /* Generic hook that takes (enum machine_mode, rtx) and returns false.  */
  73 bool
  74 hook_bool_mode_const_rtx_false (enum machine_mode mode ATTRIBUTE_UNUSED,
  75                                 const_rtx value ATTRIBUTE_UNUSED)
  76 {
  77   return false;
  78 }
  79
  80 /* Generic hook that takes (enum machine_mode, rtx) and returns true.  */
  81 bool
  82 hook_bool_mode_const_rtx_true (enum machine_mode mode ATTRIBUTE_UNUSED,
  83                                const_rtx value ATTRIBUTE_UNUSED)
  84 {
  85   return true;
  86 }
  87
  88 /* Generic hook that takes (FILE *, const char *) and does nothing.  */
  89 void
  90 hook_void_FILEptr_constcharptr (FILE *a ATTRIBUTE_UNUSED, const char *b ATTRIBUTE_UNUSED)
  91 {
  92 }
  93
  94 /* Used for the TARGET_ASM_CAN_OUTPUT_MI_THUNK hook.  */
  95 bool
  96 hook_bool_const_tree_hwi_hwi_const_tree_false (const_tree a ATTRIBUTE_UNUSED,
  97                                                HOST_WIDE_INT b ATTRIBUTE_UNUSED,
  98                                                HOST_WIDE_INT c ATTRIBUTE_UNUSED,
  99                                                const_tree d ATTRIBUTE_UNUSED)
 100 {
 101   return false;
 102 }
 103
 104 bool
 105 hook_bool_const_tree_hwi_hwi_const_tree_true (const_tree a ATTRIBUTE_UNUSED,
 106                                               HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 107                                               HOST_WIDE_INT c ATTRIBUTE_UNUSED,
 108                                               const_tree d ATTRIBUTE_UNUSED)
 109 {
 110   return true;
 111 }
 112
 113 bool
 114 hook_bool_constcharptr_size_t_false (const char *a ATTRIBUTE_UNUSED,
 115                                      size_t b ATTRIBUTE_UNUSED)
 116 {
 117   return false;
 118 }
 119
 120 bool
 121 hook_bool_size_t_constcharptr_int_true (size_t a ATTRIBUTE_UNUSED,
 122                                         const char *b ATTRIBUTE_UNUSED,
 123                                         int c ATTRIBUTE_UNUSED)
 124 {
 125   return true;
 126 }
 127
 128 bool
 129 default_can_output_mi_thunk_no_vcall (const_tree a ATTRIBUTE_UNUSED,
 130                                       HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 131                                       HOST_WIDE_INT c,
 132                                       const_tree d ATTRIBUTE_UNUSED)
 133 {
 134   return c == 0;
 135 }
 136
 137 int
 138 hook_int_const_tree_0 (const_tree a ATTRIBUTE_UNUSED)
 139 {
 140   return 0;
 141 }
 142
 143 /* ??? Used for comp_type_attributes, which ought to return bool.  */
 144 int
 145 hook_int_const_tree_const_tree_1 (const_tree a ATTRIBUTE_UNUSED, const_tree b ATTRIBUTE_UNUSED)
 146 {
 147   return 1;
 148 }
 149
 150 int
 151 hook_int_rtx_0 (rtx a 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_false (rtx a ATTRIBUTE_UNUSED,
 237                                   int b ATTRIBUTE_UNUSED,
 238                                   int c ATTRIBUTE_UNUSED,
 239                                   int *d ATTRIBUTE_UNUSED)
 240 {
 241   return false;
 242 }
 243
 244 /* Generic hook that takes an rtx and returns it.  */
 245 rtx
 246 hook_rtx_rtx_identity (rtx x)
 247 {
 248   return x;
 249 }
 250
 251 /* Generic hook that takes an rtx and returns NULL_RTX.  */
 252 rtx
 253 hook_rtx_rtx_null (rtx x ATTRIBUTE_UNUSED)
 254 {
 255   return NULL;
 256 }
 257
 258 /* Generic hook that takes a tree and an int and returns NULL_RTX.  */
 259 rtx
 260 hook_rtx_tree_int_null (tree a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 261 {
 262   return NULL;
 263 }
 264
 265 /* Generic hook that takes three trees and returns the last one as is.  */
 266 tree
 267 hook_tree_tree_tree_tree_3rd_identity (tree a ATTRIBUTE_UNUSED,
 268                                        tree b ATTRIBUTE_UNUSED, tree c)
 269 {
 270   return c;
 271 }
 272
 273 /* Generic hook that takes a tree and returns a NULL string.  */
 274 const char *
 275 hook_constcharptr_const_tree_null (const_tree t ATTRIBUTE_UNUSED)
 276 {
 277   return NULL;
 278 }
 279
 280 tree
 281 hook_tree_tree_tree_bool_null (tree t0 ATTRIBUTE_UNUSED,
 282                                tree t1 ATTRIBUTE_UNUSED,
 283                                bool ignore ATTRIBUTE_UNUSED)
 284 {
 285   return NULL;
 286 }
 287
 288 tree
 289 hook_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED, tree t1 ATTRIBUTE_UNUSED)
 290 {
 291   return NULL;
 292 }
 293
 294 tree
 295 hook_tree_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED,
 296                                tree t1 ATTRIBUTE_UNUSED,
 297                                tree t2 ATTRIBUTE_UNUSED)
 298 {
 299   return NULL;
 300 }
 301
 302 /* Generic hook that takes a rtx and returns a NULL string.  */
 303 const char *
 304 hook_constcharptr_const_rtx_null (const_rtx r ATTRIBUTE_UNUSED)
 305 {
 306   return NULL;
 307 }
 308
 309 const char *
 310 hook_constcharptr_const_tree_const_tree_null (const_tree t0 ATTRIBUTE_UNUSED,
 311                                               const_tree t1 ATTRIBUTE_UNUSED)
 312 {
 313   return NULL;
 314 }
 315
 316 const char *
 317 hook_constcharptr_int_const_tree_null (int i ATTRIBUTE_UNUSED,
 318                                        const_tree t0 ATTRIBUTE_UNUSED)
 319 {
 320   return NULL;
 321 }
 322
 323 const char *
 324 hook_constcharptr_int_const_tree_const_tree_null (int i ATTRIBUTE_UNUSED,
 325                                                   const_tree t0 ATTRIBUTE_UNUSED,
 326                                                   const_tree t1 ATTRIBUTE_UNUSED)
 327 {
 328   return NULL;
 329 }