gcc/hooks.c

   1 /* General-purpose hooks.
   2    Copyright (C) 2002, 2003, 2004, 2005 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 2, 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; if not, write to the Free Software
  16 Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  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_rtx_false (enum machine_mode mode ATTRIBUTE_UNUSED,
  75                           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_rtx_true (enum machine_mode mode ATTRIBUTE_UNUSED,
  83                          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_tree_hwi_hwi_tree_false (tree a ATTRIBUTE_UNUSED,
  97                                    HOST_WIDE_INT b ATTRIBUTE_UNUSED,
  98                                    HOST_WIDE_INT c ATTRIBUTE_UNUSED,
  99                                    tree d ATTRIBUTE_UNUSED)
 100 {
 101   return false;
 102 }
 103
 104 bool
 105 hook_bool_tree_hwi_hwi_tree_true (tree a ATTRIBUTE_UNUSED,
 106                                   HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 107                                   HOST_WIDE_INT c ATTRIBUTE_UNUSED,
 108                                   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 (tree a ATTRIBUTE_UNUSED,
 130                                       HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 131                                       HOST_WIDE_INT c,
 132                                       tree d ATTRIBUTE_UNUSED)
 133 {
 134   return c == 0;
 135 }
 136
 137 int
 138 hook_int_tree_0 (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_tree_tree_1 (tree a ATTRIBUTE_UNUSED, 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_tree_true (tree a ATTRIBUTE_UNUSED)
 194 {
 195   return true;
 196 }
 197
 198 bool
 199 hook_bool_tree_tree_false (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 200 {
 201   return false;
 202 }
 203
 204 bool
 205 hook_bool_tree_bool_false (tree a ATTRIBUTE_UNUSED, bool b ATTRIBUTE_UNUSED)
 206 {
 207   return false;
 208 }
 209
 210 bool
 211 hook_bool_rtx_false (rtx a ATTRIBUTE_UNUSED)
 212 {
 213   return false;
 214 }
 215
 216 bool
 217 hook_bool_uintp_uintp_false (unsigned int *a ATTRIBUTE_UNUSED,
 218                              unsigned int *b ATTRIBUTE_UNUSED)
 219 {
 220   return false;
 221 }
 222
 223 bool
 224 hook_bool_rtx_int_int_intp_false (rtx a ATTRIBUTE_UNUSED,
 225                                   int b ATTRIBUTE_UNUSED,
 226                                   int c ATTRIBUTE_UNUSED,
 227                                   int *d ATTRIBUTE_UNUSED)
 228 {
 229   return false;
 230 }
 231
 232 /* Generic hook that takes an rtx and returns it.  */
 233 rtx
 234 hook_rtx_rtx_identity (rtx x)
 235 {
 236   return x;
 237 }
 238
 239 /* Generic hook that takes an rtx and returns NULL_RTX.  */
 240 rtx
 241 hook_rtx_rtx_null (rtx x ATTRIBUTE_UNUSED)
 242 {
 243   return NULL;
 244 }
 245
 246 /* Generic hook that takes a tree and an int and returns NULL_RTX.  */
 247 rtx
 248 hook_rtx_tree_int_null (tree a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 249 {
 250   return NULL;
 251 }
 252
 253 /* Generic hook that takes three trees and returns the last one as is.  */
 254 tree
 255 hook_tree_tree_tree_tree_3rd_identity (tree a ATTRIBUTE_UNUSED,
 256                                        tree b ATTRIBUTE_UNUSED, tree c)
 257 {
 258   return c;
 259 }
 260
 261 /* Generic hook that takes a tree and returns a NULL string.  */
 262 const char *
 263 hook_constcharptr_tree_null (tree t ATTRIBUTE_UNUSED)
 264 {
 265   return NULL;
 266 }
 267
 268 tree
 269 hook_tree_tree_tree_bool_null (tree t0 ATTRIBUTE_UNUSED,
 270                                tree t1 ATTRIBUTE_UNUSED,
 271                                bool ignore ATTRIBUTE_UNUSED)
 272 {
 273   return NULL;
 274 }
 275
 276 tree
 277 hook_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED, tree t1 ATTRIBUTE_UNUSED)
 278 {
 279   return NULL;
 280 }
 281
 282 /* Generic hook that takes a rtx and returns a NULL string.  */
 283 const char *
 284 hook_constcharptr_rtx_null (rtx r ATTRIBUTE_UNUSED)
 285 {
 286   return NULL;
 287 }
 288
 289 const char *
 290 hook_constcharptr_tree_tree_null (tree t0 ATTRIBUTE_UNUSED,
 291                                   tree t1 ATTRIBUTE_UNUSED)
 292 {
 293   return NULL;
 294 }
 295
 296 const char *
 297 hook_constcharptr_int_tree_null (int i ATTRIBUTE_UNUSED,
 298                                  tree t0 ATTRIBUTE_UNUSED)
 299 {
 300   return NULL;
 301 }
 302
 303 const char *
 304 hook_constcharptr_int_tree_tree_null (int i ATTRIBUTE_UNUSED,
 305                                       tree t0 ATTRIBUTE_UNUSED,
 306                                       tree t1 ATTRIBUTE_UNUSED)
 307 {
 308   return NULL;
 309 }