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 /* ??? Used for comp_type_attributes, which ought to return bool.  */
 121 int
 122 hook_int_tree_tree_1 (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 123 {
 124   return 1;
 125 }
 126
 127 int
 128 hook_int_rtx_0 (rtx a ATTRIBUTE_UNUSED)
 129 {
 130   return 0;
 131 }
 132
 133 int
 134 hook_int_size_t_constcharptr_int_0 (size_t a ATTRIBUTE_UNUSED,
 135                                     const char *b ATTRIBUTE_UNUSED,
 136                                     int c ATTRIBUTE_UNUSED)
 137 {
 138   return 0;
 139 }
 140
 141 unsigned int
 142 hook_uint_uint_constcharptrptr_0 (unsigned int a ATTRIBUTE_UNUSED,
 143                                   const char **b ATTRIBUTE_UNUSED)
 144 {
 145   return 0;
 146 }
 147
 148 void
 149 hook_void_int (int b ATTRIBUTE_UNUSED)
 150 {
 151 }
 152
 153 void
 154 hook_void_tree (tree a ATTRIBUTE_UNUSED)
 155 {
 156 }
 157
 158 void
 159 hook_void_constcharptr (const char *a ATTRIBUTE_UNUSED)
 160 {
 161 }
 162
 163 void
 164 hook_void_tree_treeptr (tree a ATTRIBUTE_UNUSED, tree *b ATTRIBUTE_UNUSED)
 165 {
 166 }
 167
 168 bool
 169 hook_bool_tree_false (tree a ATTRIBUTE_UNUSED)
 170 {
 171   return false;
 172 }
 173
 174 bool
 175 hook_bool_tree_true (tree a ATTRIBUTE_UNUSED)
 176 {
 177   return true;
 178 }
 179
 180 bool
 181 hook_bool_tree_tree_false (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 182 {
 183   return false;
 184 }
 185
 186 bool
 187 hook_bool_rtx_false (rtx a ATTRIBUTE_UNUSED)
 188 {
 189   return false;
 190 }
 191
 192 bool
 193 hook_bool_uintp_uintp_false (unsigned int *a ATTRIBUTE_UNUSED,
 194                              unsigned int *b ATTRIBUTE_UNUSED)
 195 {
 196   return false;
 197 }
 198
 199 bool
 200 hook_bool_rtx_int_int_intp_false (rtx a ATTRIBUTE_UNUSED,
 201                                   int b ATTRIBUTE_UNUSED,
 202                                   int c ATTRIBUTE_UNUSED,
 203                                   int *d ATTRIBUTE_UNUSED)
 204 {
 205   return false;
 206 }
 207
 208 /* Generic hook that takes an rtx and returns it.  */
 209 rtx
 210 hook_rtx_rtx_identity (rtx x)
 211 {
 212   return x;
 213 }
 214
 215 /* Generic hook that takes an rtx and returns NULL_RTX.  */
 216 rtx
 217 hook_rtx_rtx_null (rtx x ATTRIBUTE_UNUSED)
 218 {
 219   return NULL;
 220 }
 221
 222 /* Generic hook that takes a tree and an int and returns NULL_RTX.  */
 223 rtx
 224 hook_rtx_tree_int_null (tree a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 225 {
 226   return NULL;
 227 }
 228
 229 /* Generic hook that takes a tree and returns it as is.  */
 230 tree
 231 hook_tree_tree_identity (tree a)
 232 {
 233   return a;
 234 }
 235
 236 /* Generic hook that takes a tree and returns a NULL string.  */
 237 const char *
 238 hook_constcharptr_tree_null (tree t ATTRIBUTE_UNUSED)
 239 {
 240   return NULL;
 241 }