gcc/hooks.c

   1 /* General-purpose hooks.
   2    Copyright (C) 2002, 2003, 2004 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 returns 1.  */
  59 int
  60 hook_int_void_1 (void)
  61 {
  62   return 1;
  63 }
  64
  65 /* Generic hook that takes (bool) and returns false.  */
  66 bool
  67 hook_bool_bool_false (bool a ATTRIBUTE_UNUSED)
  68 {
  69   return false;
  70 }
  71
  72 /* Generic hook that takes (enum machine_mode) and returns false.  */
  73 bool
  74 hook_bool_mode_false (enum machine_mode mode ATTRIBUTE_UNUSED)
  75 {
  76   return false;
  77 }
  78
  79 /* Generic hook that takes (FILE *, const char *) and does nothing.  */
  80 void
  81 hook_void_FILEptr_constcharptr (FILE *a ATTRIBUTE_UNUSED, const char *b ATTRIBUTE_UNUSED)
  82 {
  83 }
  84
  85 /* Used for the TARGET_ASM_CAN_OUTPUT_MI_THUNK hook.  */
  86 bool
  87 hook_bool_tree_hwi_hwi_tree_false (tree a ATTRIBUTE_UNUSED,
  88                                    HOST_WIDE_INT b ATTRIBUTE_UNUSED,
  89                                    HOST_WIDE_INT c ATTRIBUTE_UNUSED,
  90                                    tree d ATTRIBUTE_UNUSED)
  91 {
  92   return false;
  93 }
  94
  95 bool
  96 hook_bool_tree_hwi_hwi_tree_true (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 true;
 102 }
 103
 104 bool
 105 hook_bool_constcharptr_size_t_false (const char *a ATTRIBUTE_UNUSED,
 106                                      size_t b ATTRIBUTE_UNUSED)
 107 {
 108   return false;
 109 }
 110
 111 bool
 112 default_can_output_mi_thunk_no_vcall (tree a ATTRIBUTE_UNUSED,
 113                                       HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 114                                       HOST_WIDE_INT c,
 115                                       tree d ATTRIBUTE_UNUSED)
 116 {
 117   return c == 0;
 118 }
 119
 120 int
 121 hook_int_tree_0 (tree a ATTRIBUTE_UNUSED)
 122 {
 123   return 0;
 124 }
 125
 126 /* ??? Used for comp_type_attributes, which ought to return bool.  */
 127 int
 128 hook_int_tree_tree_1 (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 129 {
 130   return 1;
 131 }
 132
 133 int
 134 hook_int_rtx_0 (rtx a ATTRIBUTE_UNUSED)
 135 {
 136   return 0;
 137 }
 138
 139 int
 140 hook_int_size_t_constcharptr_int_0 (size_t a ATTRIBUTE_UNUSED,
 141                                     const char *b ATTRIBUTE_UNUSED,
 142                                     int c ATTRIBUTE_UNUSED)
 143 {
 144   return 0;
 145 }
 146
 147 unsigned int
 148 hook_uint_uint_constcharptrptr_0 (unsigned int a ATTRIBUTE_UNUSED,
 149                                   const char **b ATTRIBUTE_UNUSED)
 150 {
 151   return 0;
 152 }
 153
 154 void
 155 hook_void_int (int b ATTRIBUTE_UNUSED)
 156 {
 157 }
 158
 159 void
 160 hook_void_tree (tree a ATTRIBUTE_UNUSED)
 161 {
 162 }
 163
 164 void
 165 hook_void_constcharptr (const char *a ATTRIBUTE_UNUSED)
 166 {
 167 }
 168
 169 void
 170 hook_void_tree_treeptr (tree a ATTRIBUTE_UNUSED, tree *b ATTRIBUTE_UNUSED)
 171 {
 172 }
 173
 174 bool
 175 hook_bool_tree_false (tree a ATTRIBUTE_UNUSED)
 176 {
 177   return false;
 178 }
 179
 180 bool
 181 hook_bool_tree_true (tree a ATTRIBUTE_UNUSED)
 182 {
 183   return true;
 184 }
 185
 186 bool
 187 hook_bool_tree_tree_false (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 188 {
 189   return false;
 190 }
 191
 192 bool
 193 hook_bool_rtx_false (rtx a ATTRIBUTE_UNUSED)
 194 {
 195   return false;
 196 }
 197
 198 bool
 199 hook_bool_uintp_uintp_false (unsigned int *a ATTRIBUTE_UNUSED,
 200                              unsigned int *b ATTRIBUTE_UNUSED)
 201 {
 202   return false;
 203 }
 204
 205 bool
 206 hook_bool_rtx_int_int_intp_false (rtx a ATTRIBUTE_UNUSED,
 207                                   int b ATTRIBUTE_UNUSED,
 208                                   int c ATTRIBUTE_UNUSED,
 209                                   int *d ATTRIBUTE_UNUSED)
 210 {
 211   return false;
 212 }
 213
 214 /* Generic hook that takes an rtx and returns it.  */
 215 rtx
 216 hook_rtx_rtx_identity (rtx x)
 217 {
 218   return x;
 219 }
 220
 221 /* Generic hook that takes an rtx and returns NULL_RTX.  */
 222 rtx
 223 hook_rtx_rtx_null (rtx x ATTRIBUTE_UNUSED)
 224 {
 225   return NULL;
 226 }
 227
 228 /* Generic hook that takes a tree and an int and returns NULL_RTX.  */
 229 rtx
 230 hook_rtx_tree_int_null (tree a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 231 {
 232   return NULL;
 233 }
 234
 235 /* Generic hook that takes a tree and returns it as is.  */
 236 tree
 237 hook_tree_tree_identity (tree a)
 238 {
 239   return a;
 240 }
 241
 242 /* Generic hook that takes a tree and returns a NULL string.  */
 243 const char *
 244 hook_constcharptr_tree_null (tree t ATTRIBUTE_UNUSED)
 245 {
 246   return NULL;
 247 }
 248
 249 tree
 250 hook_tree_tree_bool_null (tree t ATTRIBUTE_UNUSED, bool ignore ATTRIBUTE_UNUSED)
 251 {
 252   return NULL;
 253 }