contrib/gcc-3.4/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
  59 /* Generic hook that takes (tree, int) and does nothing.  */
  60 void
  61 hook_void_tree_int (tree a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
  62 {
  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 void
  72 hook_void_constcharptr (const char *a ATTRIBUTE_UNUSED)
  73 {
  74 }
  75
  76 /* Used for the TARGET_ASM_CAN_OUTPUT_MI_THUNK hook.  */
  77 bool
  78 hook_bool_tree_hwi_hwi_tree_false (tree a ATTRIBUTE_UNUSED,
  79                                    HOST_WIDE_INT b ATTRIBUTE_UNUSED,
  80                                    HOST_WIDE_INT c ATTRIBUTE_UNUSED,
  81                                    tree d ATTRIBUTE_UNUSED)
  82 {
  83   return false;
  84 }
  85
  86 bool
  87 hook_bool_tree_hwi_hwi_tree_true (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 true;
  93 }
  94
  95 bool
  96 hook_bool_constcharptr_size_t_false (const char *a ATTRIBUTE_UNUSED,
  97                                      size_t b ATTRIBUTE_UNUSED)
  98 {
  99   return false;
 100 }
 101
 102 bool
 103 default_can_output_mi_thunk_no_vcall (tree a ATTRIBUTE_UNUSED,
 104                                       HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 105                                       HOST_WIDE_INT c,
 106                                       tree d ATTRIBUTE_UNUSED)
 107 {
 108   return c == 0;
 109 }
 110
 111 /* ??? Used for comp_type_attributes, which ought to return bool.  */
 112 int
 113 hook_int_tree_tree_1 (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 114 {
 115   return 1;
 116 }
 117
 118 int
 119 hook_int_rtx_0 (rtx a ATTRIBUTE_UNUSED)
 120 {
 121   return 0;
 122 }
 123
 124 int
 125 hook_int_void_0 (void)
 126 {
 127   return 0;
 128 }
 129
 130 int
 131 hook_int_size_t_constcharptr_int_0 (size_t a ATTRIBUTE_UNUSED,
 132                                     const char *b ATTRIBUTE_UNUSED,
 133                                     int c ATTRIBUTE_UNUSED)
 134 {
 135   return 0;
 136 }
 137
 138 unsigned int
 139 hook_uint_uint_constcharptrptr_0 (unsigned int a ATTRIBUTE_UNUSED,
 140                                   const char **b ATTRIBUTE_UNUSED)
 141 {
 142   return 0;
 143 }
 144
 145 void
 146 hook_void_tree (tree a ATTRIBUTE_UNUSED)
 147 {
 148 }
 149
 150 void
 151 hook_void_tree_treeptr (tree a ATTRIBUTE_UNUSED, tree *b ATTRIBUTE_UNUSED)
 152 {
 153 }
 154
 155 bool
 156 hook_bool_tree_false (tree a ATTRIBUTE_UNUSED)
 157 {
 158   return false;
 159 }
 160
 161 bool
 162 hook_bool_tree_true (tree a ATTRIBUTE_UNUSED)
 163 {
 164   return true;
 165 }
 166
 167 bool
 168 hook_bool_tree_tree_false (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 169 {
 170   return false;
 171 }
 172
 173 bool
 174 hook_bool_rtx_false (rtx a ATTRIBUTE_UNUSED)
 175 {
 176   return false;
 177 }
 178
 179 bool
 180 hook_bool_uintp_uintp_false (unsigned int *a ATTRIBUTE_UNUSED,
 181                              unsigned int *b ATTRIBUTE_UNUSED)
 182 {
 183   return false;
 184 }
 185
 186 bool
 187 hook_bool_rtx_int_int_intp_false (rtx a ATTRIBUTE_UNUSED,
 188                                   int b ATTRIBUTE_UNUSED,
 189                                   int c ATTRIBUTE_UNUSED,
 190                                   int *d ATTRIBUTE_UNUSED)
 191 {
 192   return false;
 193 }
 194
 195 /* Generic hook that takes an rtx and returns it.  */
 196 rtx
 197 hook_rtx_rtx_identity (rtx x)
 198 {
 199   return x;
 200 }
 201
 202 /* Generic hook that takes an rtx and returns NULL_RTX.  */
 203 rtx
 204 hook_rtx_rtx_null (rtx x ATTRIBUTE_UNUSED)
 205 {
 206   return NULL;
 207 }
 208
 209 /* Generic hook that takes a tree and an int and returns NULL_RTX.  */
 210 rtx
 211 hook_rtx_tree_int_null (tree a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 212 {
 213   return NULL;
 214 }
 215
 216 /* Generic hook that takes a tree and returns a NULL string.  */
 217 const char *
 218 hook_constcharptr_tree_null (tree t ATTRIBUTE_UNUSED)
 219 {
 220   return NULL;
 221 }