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 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 (FILE *, const char *) and does nothing.  */
  73 void
  74 hook_void_FILEptr_constcharptr (FILE *a ATTRIBUTE_UNUSED, const char *b ATTRIBUTE_UNUSED)
  75 {
  76 }
  77
  78 /* Used for the TARGET_ASM_CAN_OUTPUT_MI_THUNK hook.  */
  79 bool
  80 hook_bool_tree_hwi_hwi_tree_false (tree a ATTRIBUTE_UNUSED,
  81                                    HOST_WIDE_INT b ATTRIBUTE_UNUSED,
  82                                    HOST_WIDE_INT c ATTRIBUTE_UNUSED,
  83                                    tree d ATTRIBUTE_UNUSED)
  84 {
  85   return false;
  86 }
  87
  88 bool
  89 hook_bool_tree_hwi_hwi_tree_true (tree a ATTRIBUTE_UNUSED,
  90                                   HOST_WIDE_INT b ATTRIBUTE_UNUSED,
  91                                   HOST_WIDE_INT c ATTRIBUTE_UNUSED,
  92                                   tree d ATTRIBUTE_UNUSED)
  93 {
  94   return true;
  95 }
  96
  97 bool
  98 hook_bool_constcharptr_size_t_false (const char *a ATTRIBUTE_UNUSED,
  99                                      size_t b ATTRIBUTE_UNUSED)
 100 {
 101   return false;
 102 }
 103
 104 bool
 105 default_can_output_mi_thunk_no_vcall (tree a ATTRIBUTE_UNUSED,
 106                                       HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 107                                       HOST_WIDE_INT c,
 108                                       tree d ATTRIBUTE_UNUSED)
 109 {
 110   return c == 0;
 111 }
 112
 113 int
 114 hook_int_tree_0 (tree a ATTRIBUTE_UNUSED)
 115 {
 116   return 0;
 117 }
 118
 119 /* ??? Used for comp_type_attributes, which ought to return bool.  */
 120 int
 121 hook_int_tree_tree_1 (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 122 {
 123   return 1;
 124 }
 125
 126 int
 127 hook_int_rtx_0 (rtx a ATTRIBUTE_UNUSED)
 128 {
 129   return 0;
 130 }
 131
 132 int
 133 hook_int_size_t_constcharptr_int_0 (size_t a ATTRIBUTE_UNUSED,
 134                                     const char *b ATTRIBUTE_UNUSED,
 135                                     int c ATTRIBUTE_UNUSED)
 136 {
 137   return 0;
 138 }
 139
 140 unsigned int
 141 hook_uint_uint_constcharptrptr_0 (unsigned int a ATTRIBUTE_UNUSED,
 142                                   const char **b ATTRIBUTE_UNUSED)
 143 {
 144   return 0;
 145 }
 146
 147 void
 148 hook_void_tree (tree a ATTRIBUTE_UNUSED)
 149 {
 150 }
 151
 152 void
 153 hook_void_constcharptr (const char *a ATTRIBUTE_UNUSED)
 154 {
 155 }
 156
 157 void
 158 hook_void_tree_treeptr (tree a ATTRIBUTE_UNUSED, tree *b ATTRIBUTE_UNUSED)
 159 {
 160 }
 161
 162 bool
 163 hook_bool_tree_false (tree a ATTRIBUTE_UNUSED)
 164 {
 165   return false;
 166 }
 167
 168 bool
 169 hook_bool_tree_true (tree a ATTRIBUTE_UNUSED)
 170 {
 171   return true;
 172 }
 173
 174 bool
 175 hook_bool_tree_tree_false (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 176 {
 177   return false;
 178 }
 179
 180 bool
 181 hook_bool_rtx_false (rtx a ATTRIBUTE_UNUSED)
 182 {
 183   return false;
 184 }
 185
 186 bool
 187 hook_bool_uintp_uintp_false (unsigned int *a ATTRIBUTE_UNUSED,
 188                              unsigned int *b ATTRIBUTE_UNUSED)
 189 {
 190   return false;
 191 }
 192
 193 bool
 194 hook_bool_rtx_int_int_intp_false (rtx a ATTRIBUTE_UNUSED,
 195                                   int b ATTRIBUTE_UNUSED,
 196                                   int c ATTRIBUTE_UNUSED,
 197                                   int *d ATTRIBUTE_UNUSED)
 198 {
 199   return false;
 200 }
 201
 202 /* Generic hook that takes an rtx and returns it.  */
 203 rtx
 204 hook_rtx_rtx_identity (rtx x)
 205 {
 206   return x;
 207 }
 208
 209 /* Generic hook that takes an rtx and returns NULL_RTX.  */
 210 rtx
 211 hook_rtx_rtx_null (rtx x ATTRIBUTE_UNUSED)
 212 {
 213   return NULL;
 214 }
 215
 216 /* Generic hook that takes a tree and an int and returns NULL_RTX.  */
 217 rtx
 218 hook_rtx_tree_int_null (tree a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 219 {
 220   return NULL;
 221 }
 222
 223 /* Generic hook that takes a tree and returns it as is.  */
 224 tree
 225 hook_tree_tree_identity (tree a)
 226 {
 227   return a;
 228 }
 229
 230 /* Generic hook that takes a tree and returns a NULL string.  */
 231 const char *
 232 hook_constcharptr_tree_null (tree t ATTRIBUTE_UNUSED)
 233 {
 234   return NULL;
 235 }
 236
 237 tree
 238 hook_tree_tree_bool_null (tree t ATTRIBUTE_UNUSED, bool ignore ATTRIBUTE_UNUSED)
 239 {
 240   return NULL;
 241 }