gcc/hooks.c

   1 /* General-purpose hooks.
   2    Copyright (C) 2002, 2003 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 ()
  34 {
  35 }
  36
  37 /* Generic hook that takes no arguments and returns false.  */
  38 bool
  39 hook_bool_void_false ()
  40 {
  41   return false;
  42 }
  43
  44 /* Generic hook that takes (tree, int) and does nothing.  */
  45 void
  46 hook_void_tree_int (a, b)
  47      tree a ATTRIBUTE_UNUSED;
  48      int b ATTRIBUTE_UNUSED;
  49 {
  50 }
  51
  52 /* Generic hook that takes (FILE *, const char *) and does nothing.  */
  53 void
  54 hook_void_FILEptr_constcharptr (a, b)
  55      FILE *a ATTRIBUTE_UNUSED;
  56      const char *b ATTRIBUTE_UNUSED;
  57 {
  58 }
  59
  60 /* Used for the TARGET_ASM_CAN_OUTPUT_MI_THUNK hook.  */
  61 bool
  62 hook_bool_tree_hwi_hwi_tree_false (a, b, c, d)
  63      tree a ATTRIBUTE_UNUSED;
  64      HOST_WIDE_INT b ATTRIBUTE_UNUSED;
  65      HOST_WIDE_INT c ATTRIBUTE_UNUSED;
  66      tree d ATTRIBUTE_UNUSED;
  67 {
  68   return false;
  69 }
  70
  71 bool
  72 hook_bool_tree_hwi_hwi_tree_true (a, b, c, d)
  73      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 true;
  79 }
  80
  81 bool
  82 default_can_output_mi_thunk_no_vcall (a, b, c, d)
  83      tree a ATTRIBUTE_UNUSED;
  84      HOST_WIDE_INT b ATTRIBUTE_UNUSED;
  85      HOST_WIDE_INT c;
  86      tree d ATTRIBUTE_UNUSED;
  87 {
  88   return c == 0;
  89 }
  90
  91 /* ??? Used for comp_type_attributes, which ought to return bool.  */
  92 int
  93 hook_int_tree_tree_1 (a, b)
  94      tree a ATTRIBUTE_UNUSED;
  95      tree b ATTRIBUTE_UNUSED;
  96 {
  97   return 1;
  98 }
  99
 100 int
 101 hook_int_rtx_0 (a)
 102      rtx a ATTRIBUTE_UNUSED;
 103 {
 104   return 0;
 105 }
 106
 107 void
 108 hook_void_tree (a)
 109      tree a ATTRIBUTE_UNUSED;
 110 {
 111 }
 112
 113 void
 114 hook_void_tree_treeptr (a, b)
 115      tree a ATTRIBUTE_UNUSED;
 116      tree *b ATTRIBUTE_UNUSED;
 117 {
 118 }
 119
 120 bool
 121 hook_bool_tree_false (a)
 122      tree a ATTRIBUTE_UNUSED;
 123 {
 124   return false;
 125 }
 126
 127 bool
 128 hook_bool_tree_tree_false (a, b)
 129      tree a ATTRIBUTE_UNUSED;
 130      tree b ATTRIBUTE_UNUSED;
 131 {
 132   return false;
 133 }
 134
 135 bool
 136 hook_bool_rtx_false (a)
 137      rtx a ATTRIBUTE_UNUSED;
 138 {
 139   return false;
 140 }
 141
 142 bool
 143 hook_bool_rtx_int_int_intp_false (a, b, c, d)
 144      rtx a ATTRIBUTE_UNUSED;
 145      int b ATTRIBUTE_UNUSED;
 146      int c ATTRIBUTE_UNUSED;
 147      int *d ATTRIBUTE_UNUSED;
 148 {
 149   return false;
 150 }
 151
 152 /* Generic hook that takes an rtx and returns it.  */
 153 rtx
 154 hook_rtx_rtx_identity (x)
 155      rtx x;
 156 {
 157   return x;
 158 }
 159
 160 /* Generic hook that takes an rtx and returns NULL_RTX.  */
 161 rtx
 162 hook_rtx_rtx_null (x)
 163      rtx x ATTRIBUTE_UNUSED;
 164 {
 165   return 0;
 166 }