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 (FILE *, const char *) and does nothing. */ 73void 74hook_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. */ 79bool 80hook_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 88bool 89hook_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 97bool 98hook_bool_constcharptr_size_t_false (const char *a ATTRIBUTE_UNUSED, 99 size_t b ATTRIBUTE_UNUSED) 100{ 101 return false; 102} 103 104bool 105hook_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 112bool 113default_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 121int 122hook_int_tree_0 (tree a ATTRIBUTE_UNUSED) 123{ 124 return 0; 125} 126 127/* ??? Used for comp_type_attributes, which ought to return bool. */ 128int 129hook_int_tree_tree_1 (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED) 130{ 131 return 1; 132} 133 134int 135hook_int_rtx_0 (rtx a ATTRIBUTE_UNUSED) 136{ 137 return 0; 138} 139 140int 141hook_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 148unsigned int 149hook_uint_uint_constcharptrptr_0 (unsigned int a ATTRIBUTE_UNUSED, 150 const char **b ATTRIBUTE_UNUSED) 151{ 152 return 0; 153} 154 155void 156hook_void_tree (tree a ATTRIBUTE_UNUSED) 157{ 158} 159 160void 161hook_void_constcharptr (const char *a ATTRIBUTE_UNUSED) 162{ 163} 164 165void 166hook_void_tree_treeptr (tree a ATTRIBUTE_UNUSED, tree *b ATTRIBUTE_UNUSED) 167{ 168} 169 170bool 171hook_bool_tree_false (tree a ATTRIBUTE_UNUSED) 172{ 173 return false; 174} 175 176bool 177hook_bool_tree_true (tree a ATTRIBUTE_UNUSED) 178{ 179 return true; 180} 181 182bool 183hook_bool_tree_tree_false (tree a ATTRIBUTE_UNUSED, tree b ATTRIBUTE_UNUSED) 184{ 185 return false; 186} 187 188bool 189hook_bool_rtx_false (rtx a ATTRIBUTE_UNUSED) 190{ 191 return false; 192} 193 194bool 195hook_bool_rtx_int_false (rtx a ATTRIBUTE_UNUSED, int code ATTRIBUTE_UNUSED) 196{ 197 return false; 198} 199 200bool 201hook_bool_uintp_uintp_false (unsigned int *a ATTRIBUTE_UNUSED, 202 unsigned int *b ATTRIBUTE_UNUSED) 203{ 204 return false; 205} 206 207bool 208hook_bool_rtx_int_int_intp_false (rtx a ATTRIBUTE_UNUSED, 209 int b ATTRIBUTE_UNUSED, 210 int c ATTRIBUTE_UNUSED, 211 int *d ATTRIBUTE_UNUSED) 212{ 213 return false; 214} 215 216/* Generic hook that takes an rtx and returns it. */ 217rtx 218hook_rtx_rtx_identity (rtx x) 219{ 220 return x; 221} 222 223/* Generic hook that takes an rtx and returns NULL_RTX. */ 224rtx 225hook_rtx_rtx_null (rtx x ATTRIBUTE_UNUSED) 226{ 227 return NULL; 228} 229 230/* Generic hook that takes a tree and an int and returns NULL_RTX. */ 231rtx 232hook_rtx_tree_int_null (tree a ATTRIBUTE_UNUSED, int b ATTRIBUTE_UNUSED) 233{ 234 return NULL; 235} 236 237/* Generic hook that takes three trees and returns the last one as is. */ 238tree 239hook_tree_tree_tree_tree_3rd_identity (tree a ATTRIBUTE_UNUSED, 240 tree b ATTRIBUTE_UNUSED, tree c) 241{ 242 return c; 243} 244 245/* Generic hook that takes a tree and returns a NULL string. */ 246const char * 247hook_constcharptr_tree_null (tree t ATTRIBUTE_UNUSED) 248{ 249 return NULL; 250} 251 252tree 253hook_tree_tree_tree_bool_null (tree t0 ATTRIBUTE_UNUSED, tree t1 ATTRIBUTE_UNUSED, 254 bool ignore ATTRIBUTE_UNUSED) 255{ 256 return NULL; 257} 258 259/* Generic hook that takes a rtx and returns a NULL string. */ 260const char * 261hook_constcharptr_rtx_null (rtx r ATTRIBUTE_UNUSED) 262{ 263 return NULL; 264} 265 266const char * 267hook_constcharptr_tree_tree_null (tree t0 ATTRIBUTE_UNUSED, 268 tree t1 ATTRIBUTE_UNUSED) 269{ 270 return NULL; 271} 272 273const char * 274hook_constcharptr_int_tree_null (int i ATTRIBUTE_UNUSED, 275 tree t0 ATTRIBUTE_UNUSED) 276{ 277 return NULL; 278} 279 280const char * 281hook_constcharptr_int_tree_tree_null (int i ATTRIBUTE_UNUSED, 282 tree t0 ATTRIBUTE_UNUSED, 283 tree t1 ATTRIBUTE_UNUSED) 284{ 285 return NULL; 286} 287