1/* General-purpose hooks. 2 Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc. 3 4This program is free software; you can redistribute it and/or modify it 5under the terms of the GNU General Public License as published by the 6Free Software Foundation; either version 2, or (at your option) any 7later version. 8 9This program is distributed in the hope that it will be useful, 10but WITHOUT ANY WARRANTY; without even the implied warranty of 11MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12GNU General Public License for more details. 13 14You should have received a copy of the GNU General Public License 15along with this program; if not, write to the Free Software 16Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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. */ 32void 33hook_void_void (void) 34{ 35} 36 37/* Generic hook that takes no arguments and returns false. */ 38bool 39hook_bool_void_false (void) 40{ 41 return false; 42} 43 44/* Generic hook that takes no arguments and returns true. */ 45bool 46hook_bool_void_true (void) 47{ 48 return true; 49} 50 51/* Generic hook that takes no arguments and returns NO_REGS. */ 52int 53hook_int_void_no_regs (void) 54{ 55 return NO_REGS; 56} 57 58/* Generic hook that takes (bool) and returns false. */ 59bool 60hook_bool_bool_false (bool a ATTRIBUTE_UNUSED) 61{ 62 return false; 63} 64 65/* Generic hook that takes (enum machine_mode) and returns false. */ 66bool 67hook_bool_mode_false (enum machine_mode mode ATTRIBUTE_UNUSED) 68{ 69 return false; 70} 71 72/* Generic hook that takes (enum machine_mode, rtx) and returns false. */ 73bool 74hook_bool_mode_rtx_false (enum machine_mode mode ATTRIBUTE_UNUSED, 75 rtx value ATTRIBUTE_UNUSED) 76{ 77 return false; 78} 79 80/* Generic hook that takes (enum machine_mode, rtx) and returns true. */ 81bool 82hook_bool_mode_rtx_true (enum machine_mode mode ATTRIBUTE_UNUSED, 83 rtx value ATTRIBUTE_UNUSED) 84{ 85 return true; 86} 87 88/* Generic hook that takes (FILE *, const char *) and does nothing. */ 89void 90hook_void_FILEptr_constcharptr (FILE *a ATTRIBUTE_UNUSED, const char *b ATTRIBUTE_UNUSED) 91{ 92} 93 94/* Used for the TARGET_ASM_CAN_OUTPUT_MI_THUNK hook. */ 95bool 96hook_bool_tree_hwi_hwi_tree_false (tree a ATTRIBUTE_UNUSED, 97 HOST_WIDE_INT b ATTRIBUTE_UNUSED, 98 HOST_WIDE_INT c ATTRIBUTE_UNUSED, 99 tree d ATTRIBUTE_UNUSED) 100{ 101 return false; 102} 103 104bool 105hook_bool_tree_hwi_hwi_tree_true (tree a ATTRIBUTE_UNUSED, 106 HOST_WIDE_INT b ATTRIBUTE_UNUSED, 107 HOST_WIDE_INT c ATTRIBUTE_UNUSED, 108 tree d ATTRIBUTE_UNUSED) 109{ 110 return true; 111} 112 113bool 114hook_bool_constcharptr_size_t_false (const char *a ATTRIBUTE_UNUSED, 115 size_t b ATTRIBUTE_UNUSED) 116{ 117 return false; 118} 119 120bool 121hook_bool_size_t_constcharptr_int_true (size_t a ATTRIBUTE_UNUSED, 122 const char *b ATTRIBUTE_UNUSED, 123 int c ATTRIBUTE_UNUSED) 124{ 125 return true; 126} 127 128bool 129default_can_output_mi_thunk_no_vcall (tree a ATTRIBUTE_UNUSED, 130 HOST_WIDE_INT b ATTRIBUTE_UNUSED, 131 HOST_WIDE_INT c, 132 tree d ATTRIBUTE_UNUSED) 133{ 134 return c == 0; 135} 136 137int 138hook_int_tree_0 (tree a ATTRIBUTE_UNUSED) 139{ 140 return 0; 141} 142 143/* ??? Used for comp_type_attributes, which ought to return bool. */ 144int 145hook_int_tree_tree_1 (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED) 146{ 147 return 1; 148} 149 150int 151hook_int_rtx_0 (rtx a ATTRIBUTE_UNUSED) 152{ 153 return 0; 154} 155 156int 157hook_int_size_t_constcharptr_int_0 (size_t a ATTRIBUTE_UNUSED, 158 const char *b ATTRIBUTE_UNUSED, 159 int c ATTRIBUTE_UNUSED) 160{ 161 return 0; 162} 163 164unsigned int 165hook_uint_uint_constcharptrptr_0 (unsigned int a ATTRIBUTE_UNUSED, 166 const char **b ATTRIBUTE_UNUSED) 167{ 168 return 0; 169} 170 171void 172hook_void_tree (tree a ATTRIBUTE_UNUSED) 173{ 174} 175 176void 177hook_void_constcharptr (const char *a ATTRIBUTE_UNUSED) 178{ 179} 180 181void 182hook_void_tree_treeptr (tree a ATTRIBUTE_UNUSED, tree *b ATTRIBUTE_UNUSED) 183{ 184} 185 186bool 187hook_bool_tree_false (tree a ATTRIBUTE_UNUSED) 188{ 189 return false; 190} 191 192bool 193hook_bool_tree_true (tree a ATTRIBUTE_UNUSED) 194{ 195 return true; 196} 197 198bool 199hook_bool_tree_tree_false (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED) 200{ 201 return false; 202} 203 204bool 205hook_bool_tree_bool_false (tree a ATTRIBUTE_UNUSED, bool b ATTRIBUTE_UNUSED) 206{ 207 return false; 208} 209 210bool 211hook_bool_rtx_false (rtx a ATTRIBUTE_UNUSED) 212{ 213 return false; 214} 215 216bool 217hook_bool_uintp_uintp_false (unsigned int *a ATTRIBUTE_UNUSED, 218 unsigned int *b ATTRIBUTE_UNUSED) 219{ 220 return false; 221} 222 223bool 224hook_bool_rtx_int_int_intp_false (rtx a ATTRIBUTE_UNUSED, 225 int b ATTRIBUTE_UNUSED, 226 int c ATTRIBUTE_UNUSED, 227 int *d ATTRIBUTE_UNUSED) 228{ 229 return false; 230} 231 232/* Generic hook that takes an rtx and returns it. */ 233rtx 234hook_rtx_rtx_identity (rtx x) 235{ 236 return x; 237} 238 239/* Generic hook that takes an rtx and returns NULL_RTX. */ 240rtx 241hook_rtx_rtx_null (rtx x ATTRIBUTE_UNUSED) 242{ 243 return NULL; 244} 245 246/* Generic hook that takes a tree and an int and returns NULL_RTX. */ 247rtx 248hook_rtx_tree_int_null (tree a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED) 249{ 250 return NULL; 251} 252 253/* Generic hook that takes three trees and returns the last one as is. */ 254tree 255hook_tree_tree_tree_tree_3rd_identity (tree a ATTRIBUTE_UNUSED, 256 tree b ATTRIBUTE_UNUSED, tree c) 257{ 258 return c; 259} 260 261/* Generic hook that takes a tree and returns a NULL string. */ 262const char * 263hook_constcharptr_tree_null (tree t ATTRIBUTE_UNUSED) 264{ 265 return NULL; 266} 267 268tree 269hook_tree_tree_tree_bool_null (tree t0 ATTRIBUTE_UNUSED, tree t1 ATTRIBUTE_UNUSED, 270 bool ignore ATTRIBUTE_UNUSED) 271{ 272 return NULL; 273} 274 275tree 276hook_tree_tree_tree_null (tree t0 ATTRIBUTE_UNUSED, tree t1 ATTRIBUTE_UNUSED) 277{ 278 return NULL; 279} 280 281/* Generic hook that takes a rtx and returns a NULL string. */ 282const char * 283hook_constcharptr_rtx_null (rtx r ATTRIBUTE_UNUSED) 284{ 285 return NULL; 286} 287 288const char * 289hook_constcharptr_tree_tree_null (tree t0 ATTRIBUTE_UNUSED, 290 tree t1 ATTRIBUTE_UNUSED) 291{ 292 return NULL; 293} 294 295const char * 296hook_constcharptr_int_tree_null (int i ATTRIBUTE_UNUSED, 297 tree t0 ATTRIBUTE_UNUSED) 298{ 299 return NULL; 300} 301 302const char * 303hook_constcharptr_int_tree_tree_null (int i ATTRIBUTE_UNUSED, 304 tree t0 ATTRIBUTE_UNUSED, 305 tree t1 ATTRIBUTE_UNUSED) 306{ 307 return NULL; 308} 309