gcc/hooks.c

   1 /* General-purpose hooks.
   2    Copyright (C) 2002, 2003, 2004, 2005, 2007, 2008
   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 no arguments and returns NO_REGS.  */
  53 int
  54 hook_int_void_no_regs (void)
  55 {
  56   return NO_REGS;
  57 }
  58
  59 /* Generic hook that takes (bool) and returns false.  */
  60 bool
  61 hook_bool_bool_false (bool a ATTRIBUTE_UNUSED)
  62 {
  63   return false;
  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, rtx) and returns false.  */
  74 bool
  75 hook_bool_mode_const_rtx_false (enum machine_mode mode ATTRIBUTE_UNUSED,
  76                                 const_rtx value ATTRIBUTE_UNUSED)
  77 {
  78   return false;
  79 }
  80
  81 /* Generic hook that takes (enum machine_mode, rtx) and returns true.  */
  82 bool
  83 hook_bool_mode_const_rtx_true (enum machine_mode mode ATTRIBUTE_UNUSED,
  84                                const_rtx value ATTRIBUTE_UNUSED)
  85 {
  86   return true;
  87 }
  88
  89 /* Generic hook that takes (FILE *, const char *) and does nothing.  */
  90 void
  91 hook_void_FILEptr_constcharptr (FILE *a ATTRIBUTE_UNUSED, const char *b ATTRIBUTE_UNUSED)
  92 {
  93 }
  94
  95 /* Used for the TARGET_ASM_CAN_OUTPUT_MI_THUNK hook.  */
  96 bool
  97 hook_bool_const_tree_hwi_hwi_const_tree_false (const_tree a ATTRIBUTE_UNUSED,
  98                                                HOST_WIDE_INT b ATTRIBUTE_UNUSED,
  99                                                HOST_WIDE_INT c ATTRIBUTE_UNUSED,
 100                                                const_tree d ATTRIBUTE_UNUSED)
 101 {
 102   return false;
 103 }
 104
 105 bool
 106 hook_bool_const_tree_hwi_hwi_const_tree_true (const_tree a ATTRIBUTE_UNUSED,
 107                                               HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 108                                               HOST_WIDE_INT c ATTRIBUTE_UNUSED,
 109                                               const_tree d ATTRIBUTE_UNUSED)
 110 {
 111   return true;
 112 }
 113
 114 bool
 115 hook_bool_constcharptr_size_t_false (const char *a ATTRIBUTE_UNUSED,
 116                                      size_t b ATTRIBUTE_UNUSED)
 117 {
 118   return false;
 119 }
 120
 121 bool
 122 hook_bool_size_t_constcharptr_int_true (size_t a ATTRIBUTE_UNUSED,
 123                                         const char *b ATTRIBUTE_UNUSED,
 124                                         int c ATTRIBUTE_UNUSED)
 125 {
 126   return true;
 127 }
 128
 129 bool
 130 default_can_output_mi_thunk_no_vcall (const_tree a ATTRIBUTE_UNUSED,
 131                                       HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 132                                       HOST_WIDE_INT c,
 133                                       const_tree d ATTRIBUTE_UNUSED)
 134 {
 135   return c == 0;
 136 }
 137
 138 int
 139 hook_int_const_tree_0 (const_tree a ATTRIBUTE_UNUSED)
 140 {
 141   return 0;
 142 }
 143
 144 /* ??? Used for comp_type_attributes, which ought to return bool.  */
 145 int
 146 hook_int_const_tree_const_tree_1 (const_tree a ATTRIBUTE_UNUSED, const_tree b ATTRIBUTE_UNUSED)
 147 {
 148   return 1;
 149 }
 150
 151 int
 152 hook_int_rtx_0 (rtx a ATTRIBUTE_UNUSED)
 153 {
 154   return 0;
 155 }
 156
 157 int
 158 hook_int_rtx_bool_0 (rtx a ATTRIBUTE_UNUSED, bool b ATTRIBUTE_UNUSED)
 159 {
 160   return 0;
 161 }
 162
 163 int
 164 hook_int_size_t_constcharptr_int_0 (size_t a ATTRIBUTE_UNUSED,
 165                                     const char *b ATTRIBUTE_UNUSED,
 166                                     int c ATTRIBUTE_UNUSED)
 167 {
 168   return 0;
 169 }
 170
 171 unsigned int
 172 hook_uint_uint_constcharptrptr_0 (unsigned int a ATTRIBUTE_UNUSED,
 173                                   const char **b ATTRIBUTE_UNUSED)
 174 {
 175   return 0;
 176 }
 177
 178 void
 179 hook_void_tree (tree a ATTRIBUTE_UNUSED)
 180 {
 181 }
 182
 183 void
 184 hook_void_constcharptr (const char *a ATTRIBUTE_UNUSED)
 185 {
 186 }
 187
 188 void
 189 hook_void_tree_treeptr (tree a ATTRIBUTE_UNUSED, tree *b ATTRIBUTE_UNUSED)
 190 {
 191 }
 192
 193 bool
 194 hook_bool_tree_false (tree a ATTRIBUTE_UNUSED)
 195 {
 196   return false;
 197 }
 198
 199 bool
 200 hook_bool_const_tree_false (const_tree a ATTRIBUTE_UNUSED)
 201 {
 202   return false;
 203 }
 204
 205 bool
 206 hook_bool_tree_true (tree a ATTRIBUTE_UNUSED)
 207 {
 208   return true;
 209 }
 210
 211 bool
 212 hook_bool_const_tree_true (const_tree a ATTRIBUTE_UNUSED)
 213 {
 214   return true;
 215 }
 216
 217 bool
 218 hook_bool_tree_tree_false (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 219 {
 220   return false;
 221 }
 222
 223 bool
 224 hook_bool_tree_bool_false (tree a ATTRIBUTE_UNUSED, bool b ATTRIBUTE_UNUSED)
 225 {
 226   return false;
 227 }
 228
 229 bool
 230 hook_bool_rtx_false (rtx a ATTRIBUTE_UNUSED)
 231 {
 232   return false;
 233 }
 234
 235 bool
 236 hook_bool_uintp_uintp_false (unsigned int *a ATTRIBUTE_UNUSED,
 237                              unsigned int *b ATTRIBUTE_UNUSED)
 238 {
 239   return false;
 240 }
 241
 242 bool
 243 hook_bool_rtx_int_int_intp_bool_false (rtx a ATTRIBUTE_UNUSED,
 244                                        int b ATTRIBUTE_UNUSED,
 245                                        int c ATTRIBUTE_UNUSED,
 246                                        int *d ATTRIBUTE_UNUSED,
 247                                        bool speed_p ATTRIBUTE_UNUSED)
 248 {
 249   return false;
 250 }
 251
 252 /* Generic hook that takes an rtx and returns it.  */
 253 rtx
 254 hook_rtx_rtx_identity (rtx x)
 255 {
 256   return x;
 257 }
 258
 259 /* Generic hook that takes an rtx and returns NULL_RTX.  */
 260 rtx
 261 hook_rtx_rtx_null (rtx x ATTRIBUTE_UNUSED)
 262 {
 263   return NULL;
 264 }
 265
 266 /* Generic hook that takes a tree and an int and returns NULL_RTX.  */
 267 rtx
 268 hook_rtx_tree_int_null (tree a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 269 {
 270   return NULL;
 271 }
 272
 273 /* Generic hook that takes three trees and returns the last one as is.  */
 274 tree
 275 hook_tree_tree_tree_tree_3rd_identity (tree a ATTRIBUTE_UNUSED,
 276                                        tree b ATTRIBUTE_UNUSED, tree c)
 277 {
 278   return c;
 279 }
 280
 281 /* Generic hook that takes a tree and returns a NULL string.  */
 282 const char *
 283 hook_constcharptr_const_tree_null (const_tree t ATTRIBUTE_UNUSED)
 284 {
 285   return NULL;
 286 }
 287
 288 tree
 289 hook_tree_tree_tree_bool_null (tree t0 ATTRIBUTE_UNUSED,
 290                                tree t1 ATTRIBUTE_UNUSED,
 291                                bool ignore ATTRIBUTE_UNUSED)
 292 {
 293   return NULL;
 294 }
 295
 296 tree
 297 hook_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED, tree t1 ATTRIBUTE_UNUSED)
 298 {
 299   return NULL;
 300 }
 301
 302 tree
 303 hook_tree_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED,
 304                                tree t1 ATTRIBUTE_UNUSED,
 305                                tree t2 ATTRIBUTE_UNUSED)
 306 {
 307   return NULL;
 308 }
 309
 310 /* Generic hook that takes a rtx and returns a NULL string.  */
 311 const char *
 312 hook_constcharptr_const_rtx_null (const_rtx r ATTRIBUTE_UNUSED)
 313 {
 314   return NULL;
 315 }
 316
 317 const char *
 318 hook_constcharptr_const_tree_const_tree_null (const_tree t0 ATTRIBUTE_UNUSED,
 319                                               const_tree t1 ATTRIBUTE_UNUSED)
 320 {
 321   return NULL;
 322 }
 323
 324 const char *
 325 hook_constcharptr_int_const_tree_null (int i ATTRIBUTE_UNUSED,
 326                                        const_tree t0 ATTRIBUTE_UNUSED)
 327 {
 328   return NULL;
 329 }
 330
 331 const char *
 332 hook_constcharptr_int_const_tree_const_tree_null (int i ATTRIBUTE_UNUSED,
 333                                                   const_tree t0 ATTRIBUTE_UNUSED,
 334                                                   const_tree t1 ATTRIBUTE_UNUSED)
 335 {
 336   return NULL;
 337 }