gcc/hooks.c

   1 /* General-purpose hooks.
   2    Copyright (C) 2002, 2003, 2004, 2005 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 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 hook_bool_size_t_constcharptr_int_true (size_t a ATTRIBUTE_UNUSED,
 106                                         const char *b ATTRIBUTE_UNUSED,
 107                                         int c ATTRIBUTE_UNUSED)
 108 {
 109   return true;
 110 }
 111
 112 bool
 113 default_can_output_mi_thunk_no_vcall (tree a ATTRIBUTE_UNUSED,
 114                                       HOST_WIDE_INT b ATTRIBUTE_UNUSED,
 115                                       HOST_WIDE_INT c,
 116                                       tree d ATTRIBUTE_UNUSED)
 117 {
 118   return c == 0;
 119 }
 120
 121 int
 122 hook_int_tree_0 (tree a ATTRIBUTE_UNUSED)
 123 {
 124   return 0;
 125 }
 126
 127 /* ??? Used for comp_type_attributes, which ought to return bool.  */
 128 int
 129 hook_int_tree_tree_1 (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 130 {
 131   return 1;
 132 }
 133
 134 int
 135 hook_int_rtx_0 (rtx a ATTRIBUTE_UNUSED)
 136 {
 137   return 0;
 138 }
 139
 140 int
 141 hook_int_size_t_constcharptr_int_0 (size_t a ATTRIBUTE_UNUSED,
 142                                     const char *b ATTRIBUTE_UNUSED,
 143                                     int c ATTRIBUTE_UNUSED)
 144 {
 145   return 0;
 146 }
 147
 148 unsigned int
 149 hook_uint_uint_constcharptrptr_0 (unsigned int a ATTRIBUTE_UNUSED,
 150                                   const char **b ATTRIBUTE_UNUSED)
 151 {
 152   return 0;
 153 }
 154
 155 void
 156 hook_void_tree (tree a ATTRIBUTE_UNUSED)
 157 {
 158 }
 159
 160 void
 161 hook_void_constcharptr (const char *a ATTRIBUTE_UNUSED)
 162 {
 163 }
 164
 165 void
 166 hook_void_tree_treeptr (tree a ATTRIBUTE_UNUSED, tree *b ATTRIBUTE_UNUSED)
 167 {
 168 }
 169
 170 bool
 171 hook_bool_tree_false (tree a ATTRIBUTE_UNUSED)
 172 {
 173   return false;
 174 }
 175
 176 bool
 177 hook_bool_tree_true (tree a ATTRIBUTE_UNUSED)
 178 {
 179   return true;
 180 }
 181
 182 bool
 183 hook_bool_tree_tree_false (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED)
 184 {
 185   return false;
 186 }
 187
 188 bool
 189 hook_bool_rtx_false (rtx a ATTRIBUTE_UNUSED)
 190 {
 191   return false;
 192 }
 193
 194 bool
 195 hook_bool_uintp_uintp_false (unsigned int *a ATTRIBUTE_UNUSED,
 196                              unsigned int *b ATTRIBUTE_UNUSED)
 197 {
 198   return false;
 199 }
 200
 201 bool
 202 hook_bool_rtx_int_int_intp_false (rtx a ATTRIBUTE_UNUSED,
 203                                   int b ATTRIBUTE_UNUSED,
 204                                   int c ATTRIBUTE_UNUSED,
 205                                   int *d ATTRIBUTE_UNUSED)
 206 {
 207   return false;
 208 }
 209
 210 /* Generic hook that takes an rtx and returns it.  */
 211 rtx
 212 hook_rtx_rtx_identity (rtx x)
 213 {
 214   return x;
 215 }
 216
 217 /* Generic hook that takes an rtx and returns NULL_RTX.  */
 218 rtx
 219 hook_rtx_rtx_null (rtx x ATTRIBUTE_UNUSED)
 220 {
 221   return NULL;
 222 }
 223
 224 /* Generic hook that takes a tree and an int and returns NULL_RTX.  */
 225 rtx
 226 hook_rtx_tree_int_null (tree a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED)
 227 {
 228   return NULL;
 229 }
 230
 231 /* Generic hook that takes three trees and returns the last one as is.  */
 232 tree
 233 hook_tree_tree_tree_tree_3rd_identity (tree a ATTRIBUTE_UNUSED,
 234                                        tree b ATTRIBUTE_UNUSED, tree c)
 235 {
 236   return c;
 237 }
 238
 239 /* Generic hook that takes a tree and returns a NULL string.  */
 240 const char *
 241 hook_constcharptr_tree_null (tree t ATTRIBUTE_UNUSED)
 242 {
 243   return NULL;
 244 }
 245
 246 tree
 247 hook_tree_tree_tree_bool_null (tree t0 ATTRIBUTE_UNUSED, tree t1 ATTRIBUTE_UNUSED,
 248                                bool ignore ATTRIBUTE_UNUSED)
 249 {
 250   return NULL;
 251 }