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 /* The same, but formally returning NO_REGS.  */
  45 int
  46 hook_int_void_no_regs (void)
  47 {
  48   return NO_REGS;
  49 }
  50
  51 /* Generic hook that returns 1.  */
  52 int
  53 hook_int_void_1 (void)
  54 {
  55   return 1;
  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 /* ??? Used for comp_type_attributes, which ought to return bool.  */
 114 int
 115 hook_int_tree_tree_1 (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 116 {
 117   return 1;
 118 }
 119
 120 int
 121 hook_int_rtx_0 (rtx a ATTRIBUTE_UNUSED)
 122 {
 123   return 0;
 124 }
 125
 126 int
 127 hook_int_size_t_constcharptr_int_0 (size_t a ATTRIBUTE_UNUSED,
 128                                     const char *b ATTRIBUTE_UNUSED,
 129                                     int c ATTRIBUTE_UNUSED)
 130 {
 131   return 0;
 132 }
 133
 134 unsigned int
 135 hook_uint_uint_constcharptrptr_0 (unsigned int a ATTRIBUTE_UNUSED,
 136                                   const char **b ATTRIBUTE_UNUSED)
 137 {
 138   return 0;
 139 }
 140
 141 void
 142 hook_void_int (int b ATTRIBUTE_UNUSED)
 143 {
 144 }
 145
 146 void
 147 hook_void_tree (tree a ATTRIBUTE_UNUSED)
 148 {
 149 }
 150
 151 void
 152 hook_void_constcharptr (const char *a ATTRIBUTE_UNUSED)
 153 {
 154 }
 155
 156 void
 157 hook_void_tree_treeptr (tree a ATTRIBUTE_UNUSED, tree *b ATTRIBUTE_UNUSED)
 158 {
 159 }
 160
 161 bool
 162 hook_bool_tree_false (tree a ATTRIBUTE_UNUSED)
 163 {
 164   return false;
 165 }
 166
 167 bool
 168 hook_bool_tree_true (tree a ATTRIBUTE_UNUSED)
 169 {
 170   return true;
 171 }
 172
 173 bool
 174 hook_bool_tree_tree_false (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 175 {
 176   return false;
 177 }
 178
 179 bool
 180 hook_bool_rtx_false (rtx a ATTRIBUTE_UNUSED)
 181 {
 182   return false;
 183 }
 184
 185 bool
 186 hook_bool_uintp_uintp_false (unsigned int *a ATTRIBUTE_UNUSED,
 187                              unsigned int *b ATTRIBUTE_UNUSED)
 188 {
 189   return false;
 190 }
 191
 192 bool
 193 hook_bool_rtx_int_int_intp_false (rtx a ATTRIBUTE_UNUSED,
 194                                   int b ATTRIBUTE_UNUSED,
 195                                   int c ATTRIBUTE_UNUSED,
 196                                   int *d ATTRIBUTE_UNUSED)
 197 {
 198   return false;
 199 }
 200
 201 /* Generic hook that takes an rtx and returns it.  */
 202 rtx
 203 hook_rtx_rtx_identity (rtx x)
 204 {
 205   return x;
 206 }
 207
 208 /* Generic hook that takes an rtx and returns NULL_RTX.  */
 209 rtx
 210 hook_rtx_rtx_null (rtx x ATTRIBUTE_UNUSED)
 211 {
 212   return NULL;
 213 }
 214
 215 /* Generic hook that takes a tree and an int and returns NULL_RTX.  */
 216 rtx
 217 hook_rtx_tree_int_null (tree a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 218 {
 219   return NULL;
 220 }
 221
 222 /* Generic hook that takes a tree and returns it as is.  */
 223 tree
 224 hook_tree_tree_identity (tree a)
 225 {
 226   return a;
 227 }
 228
 229 /* Generic hook that takes a tree and returns a NULL string.  */
 230 const char *
 231 hook_constcharptr_tree_null (tree t ATTRIBUTE_UNUSED)
 232 {
 233   return NULL;
 234 }