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 takes (bool) and returns false.  */
  52 bool
  53 hook_bool_bool_false (bool a ATTRIBUTE_UNUSED)
  54 {
  55   return false;
  56 }
  57
  58 /* Generic hook that takes (FILE *, const char *) and does nothing.  */
  59 void
  60 hook_void_FILEptr_constcharptr (FILE *a ATTRIBUTE_UNUSED, const char *b ATTRIBUTE_UNUSED)
  61 {
  62 }
  63
  64 /* Used for the TARGET_ASM_CAN_OUTPUT_MI_THUNK hook.  */
  65 bool
  66 hook_bool_tree_hwi_hwi_tree_false (tree a ATTRIBUTE_UNUSED,
  67                                    HOST_WIDE_INT b ATTRIBUTE_UNUSED,
  68                                    HOST_WIDE_INT c ATTRIBUTE_UNUSED,
  69                                    tree d ATTRIBUTE_UNUSED)
  70 {
  71   return false;
  72 }
  73
  74 bool
  75 hook_bool_tree_hwi_hwi_tree_true (tree a ATTRIBUTE_UNUSED,
  76                                   HOST_WIDE_INT b ATTRIBUTE_UNUSED,
  77                                   HOST_WIDE_INT c ATTRIBUTE_UNUSED,
  78                                   tree d ATTRIBUTE_UNUSED)
  79 {
  80   return true;
  81 }
  82
  83 bool
  84 hook_bool_constcharptr_size_t_false (const char *a ATTRIBUTE_UNUSED,
  85                                      size_t b ATTRIBUTE_UNUSED)
  86 {
  87   return false;
  88 }
  89
  90 bool
  91 default_can_output_mi_thunk_no_vcall (tree a ATTRIBUTE_UNUSED,
  92                                       HOST_WIDE_INT b ATTRIBUTE_UNUSED,
  93                                       HOST_WIDE_INT c,
  94                                       tree d ATTRIBUTE_UNUSED)
  95 {
  96   return c == 0;
  97 }
  98
  99 /* ??? Used for comp_type_attributes, which ought to return bool.  */
 100 int
 101 hook_int_tree_tree_1 (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 102 {
 103   return 1;
 104 }
 105
 106 int
 107 hook_int_rtx_0 (rtx a ATTRIBUTE_UNUSED)
 108 {
 109   return 0;
 110 }
 111
 112 int
 113 hook_int_size_t_constcharptr_int_0 (size_t a ATTRIBUTE_UNUSED,
 114                                     const char *b ATTRIBUTE_UNUSED,
 115                                     int c ATTRIBUTE_UNUSED)
 116 {
 117   return 0;
 118 }
 119
 120 unsigned int
 121 hook_uint_uint_constcharptrptr_0 (unsigned int a ATTRIBUTE_UNUSED,
 122                                   const char **b ATTRIBUTE_UNUSED)
 123 {
 124   return 0;
 125 }
 126
 127 void
 128 hook_void_int (int b ATTRIBUTE_UNUSED)
 129 {
 130 }
 131
 132 void
 133 hook_void_tree (tree a ATTRIBUTE_UNUSED)
 134 {
 135 }
 136
 137 void
 138 hook_void_charptr (char *a ATTRIBUTE_UNUSED)
 139 {
 140 }
 141
 142 void
 143 hook_void_tree_treeptr (tree a ATTRIBUTE_UNUSED, tree *b ATTRIBUTE_UNUSED)
 144 {
 145 }
 146
 147 bool
 148 hook_bool_tree_false (tree a ATTRIBUTE_UNUSED)
 149 {
 150   return false;
 151 }
 152
 153 bool
 154 hook_bool_tree_true (tree a ATTRIBUTE_UNUSED)
 155 {
 156   return true;
 157 }
 158
 159 bool
 160 hook_bool_tree_tree_false (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 161 {
 162   return false;
 163 }
 164
 165 bool
 166 hook_bool_rtx_false (rtx a ATTRIBUTE_UNUSED)
 167 {
 168   return false;
 169 }
 170
 171 bool
 172 hook_bool_uintp_uintp_false (unsigned int *a ATTRIBUTE_UNUSED,
 173                              unsigned int *b ATTRIBUTE_UNUSED)
 174 {
 175   return false;
 176 }
 177
 178 bool
 179 hook_bool_rtx_int_int_intp_false (rtx a ATTRIBUTE_UNUSED,
 180                                   int b ATTRIBUTE_UNUSED,
 181                                   int c ATTRIBUTE_UNUSED,
 182                                   int *d ATTRIBUTE_UNUSED)
 183 {
 184   return false;
 185 }
 186
 187 /* Generic hook that takes an rtx and returns it.  */
 188 rtx
 189 hook_rtx_rtx_identity (rtx x)
 190 {
 191   return x;
 192 }
 193
 194 /* Generic hook that takes an rtx and returns NULL_RTX.  */
 195 rtx
 196 hook_rtx_rtx_null (rtx x ATTRIBUTE_UNUSED)
 197 {
 198   return NULL;
 199 }
 200
 201 /* Generic hook that takes a tree and an int and returns NULL_RTX.  */
 202 rtx
 203 hook_rtx_tree_int_null (tree a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 204 {
 205   return NULL;
 206 }
 207
 208 /* Generic hook that takes a tree and returns it as is.  */
 209 tree
 210 hook_tree_tree_identity (tree a)
 211 {
 212   return a;
 213 }
 214
 215 /* Generic hook that takes a tree and returns a NULL string.  */
 216 const char *
 217 hook_constcharptr_tree_null (tree t ATTRIBUTE_UNUSED)
 218 {
 219   return NULL;
 220 }