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 (FILE *, const char *) and does nothing.  */
  66 void
  67 hook_void_FILEptr_constcharptr (FILE *a ATTRIBUTE_UNUSED, const char *b ATTRIBUTE_UNUSED)
  68 {
  69 }
  70
  71 /* Used for the TARGET_ASM_CAN_OUTPUT_MI_THUNK hook.  */
  72 bool
  73 hook_bool_tree_hwi_hwi_tree_false (tree a ATTRIBUTE_UNUSED,
  74                                    HOST_WIDE_INT b ATTRIBUTE_UNUSED,
  75                                    HOST_WIDE_INT c ATTRIBUTE_UNUSED,
  76                                    tree d ATTRIBUTE_UNUSED)
  77 {
  78   return false;
  79 }
  80
  81 bool
  82 hook_bool_tree_hwi_hwi_tree_true (tree a ATTRIBUTE_UNUSED,
  83                                   HOST_WIDE_INT b ATTRIBUTE_UNUSED,
  84                                   HOST_WIDE_INT c ATTRIBUTE_UNUSED,
  85                                   tree d ATTRIBUTE_UNUSED)
  86 {
  87   return true;
  88 }
  89
  90 bool
  91 hook_bool_constcharptr_size_t_false (const char *a ATTRIBUTE_UNUSED,
  92                                      size_t b ATTRIBUTE_UNUSED)
  93 {
  94   return false;
  95 }
  96
  97 bool
  98 default_can_output_mi_thunk_no_vcall (tree a ATTRIBUTE_UNUSED,
  99                                       HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 100                                       HOST_WIDE_INT c,
 101                                       tree d ATTRIBUTE_UNUSED)
 102 {
 103   return c == 0;
 104 }
 105
 106 /* ??? Used for comp_type_attributes, which ought to return bool.  */
 107 int
 108 hook_int_tree_tree_1 (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 109 {
 110   return 1;
 111 }
 112
 113 int
 114 hook_int_rtx_0 (rtx a ATTRIBUTE_UNUSED)
 115 {
 116   return 0;
 117 }
 118
 119 int
 120 hook_int_size_t_constcharptr_int_0 (size_t a ATTRIBUTE_UNUSED,
 121                                     const char *b ATTRIBUTE_UNUSED,
 122                                     int c ATTRIBUTE_UNUSED)
 123 {
 124   return 0;
 125 }
 126
 127 unsigned int
 128 hook_uint_uint_constcharptrptr_0 (unsigned int a ATTRIBUTE_UNUSED,
 129                                   const char **b ATTRIBUTE_UNUSED)
 130 {
 131   return 0;
 132 }
 133
 134 void
 135 hook_void_int (int b ATTRIBUTE_UNUSED)
 136 {
 137 }
 138
 139 void
 140 hook_void_tree (tree a ATTRIBUTE_UNUSED)
 141 {
 142 }
 143
 144 void
 145 hook_void_constcharptr (const char *a ATTRIBUTE_UNUSED)
 146 {
 147 }
 148
 149 void
 150 hook_void_tree_treeptr (tree a ATTRIBUTE_UNUSED, tree *b ATTRIBUTE_UNUSED)
 151 {
 152 }
 153
 154 bool
 155 hook_bool_tree_false (tree a ATTRIBUTE_UNUSED)
 156 {
 157   return false;
 158 }
 159
 160 bool
 161 hook_bool_tree_true (tree a ATTRIBUTE_UNUSED)
 162 {
 163   return true;
 164 }
 165
 166 bool
 167 hook_bool_tree_tree_false (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 168 {
 169   return false;
 170 }
 171
 172 bool
 173 hook_bool_rtx_false (rtx a ATTRIBUTE_UNUSED)
 174 {
 175   return false;
 176 }
 177
 178 bool
 179 hook_bool_uintp_uintp_false (unsigned int *a ATTRIBUTE_UNUSED,
 180                              unsigned int *b ATTRIBUTE_UNUSED)
 181 {
 182   return false;
 183 }
 184
 185 bool
 186 hook_bool_rtx_int_int_intp_false (rtx a ATTRIBUTE_UNUSED,
 187                                   int b ATTRIBUTE_UNUSED,
 188                                   int c ATTRIBUTE_UNUSED,
 189                                   int *d ATTRIBUTE_UNUSED)
 190 {
 191   return false;
 192 }
 193
 194 /* Generic hook that takes an rtx and returns it.  */
 195 rtx
 196 hook_rtx_rtx_identity (rtx x)
 197 {
 198   return x;
 199 }
 200
 201 /* Generic hook that takes an rtx and returns NULL_RTX.  */
 202 rtx
 203 hook_rtx_rtx_null (rtx x ATTRIBUTE_UNUSED)
 204 {
 205   return NULL;
 206 }
 207
 208 /* Generic hook that takes a tree and an int and returns NULL_RTX.  */
 209 rtx
 210 hook_rtx_tree_int_null (tree a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 211 {
 212   return NULL;
 213 }
 214
 215 /* Generic hook that takes a tree and returns it as is.  */
 216 tree
 217 hook_tree_tree_identity (tree a)
 218 {
 219   return a;
 220 }
 221
 222 /* Generic hook that takes a tree and returns a NULL string.  */
 223 const char *
 224 hook_constcharptr_tree_null (tree t ATTRIBUTE_UNUSED)
 225 {
 226   return NULL;
 227 }