langhooks.c revision 90075
1/* Default language-specific hooks. 2 Copyright 2001 Free Software Foundation, Inc. 3 Contributed by Alexandre Oliva <aoliva@redhat.com> 4 5This file is part of GNU CC. 6 7GNU CC is free software; you can redistribute it and/or modify 8it under the terms of the GNU General Public License as published by 9the Free Software Foundation; either version 2, or (at your option) 10any later version. 11 12GNU CC is distributed in the hope that it will be useful, 13but WITHOUT ANY WARRANTY; without even the implied warranty of 14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15GNU General Public License for more details. 16 17You should have received a copy of the GNU General Public License 18along with GNU CC; see the file COPYING. If not, write to 19the Free Software Foundation, 59 Temple Place - Suite 330, 20Boston, MA 02111-1307, USA. */ 21 22#include "config.h" 23#include "system.h" 24#include "toplev.h" 25#include "tree.h" 26#include "c-tree.h" 27#include "tree-inline.h" 28#include "rtl.h" 29#include "insn-config.h" 30#include "integrate.h" 31#include "langhooks.h" 32#include "langhooks-def.h" 33 34/* Do nothing; in many cases the default hook. */ 35 36void 37lhd_do_nothing () 38{ 39} 40 41/* Do nothing (return the tree node passed). */ 42 43tree 44lhd_return_tree (t) 45 tree t; 46{ 47 return t; 48} 49 50/* Do nothing; the default hook to decode an option. */ 51 52int 53lhd_decode_option (argc, argv) 54 int argc ATTRIBUTE_UNUSED; 55 char **argv ATTRIBUTE_UNUSED; 56{ 57 return 0; 58} 59 60/* Called from by print-tree.c. */ 61 62void 63lhd_print_tree_nothing (file, node, indent) 64 FILE *file ATTRIBUTE_UNUSED; 65 tree node ATTRIBUTE_UNUSED; 66 int indent ATTRIBUTE_UNUSED; 67{ 68} 69 70/* Called from safe_from_p. */ 71 72int 73lhd_safe_from_p (x, exp) 74 rtx x ATTRIBUTE_UNUSED; 75 tree exp ATTRIBUTE_UNUSED; 76{ 77 return 1; 78} 79 80/* Called from staticp. */ 81 82int 83lhd_staticp (exp) 84 tree exp ATTRIBUTE_UNUSED; 85{ 86 return 0; 87} 88 89/* Called when -dy is given on the command line. */ 90 91void 92lhd_set_yydebug (value) 93 int value; 94{ 95 if (value) 96 fprintf (stderr, "warning: no yacc/bison-generated output to debug!\n"); 97} 98 99/* Provide a default routine to clear the binding stack. This is used 100 by languages that don't need to do anything special. */ 101void 102lhd_clear_binding_stack () 103{ 104 while (! global_bindings_p ()) 105 poplevel (0, 0, 0); 106} 107 108/* Provide a default routine for alias sets that always returns -1. This 109 is used by languages that don't need to do anything special. */ 110 111HOST_WIDE_INT 112lhd_get_alias_set (t) 113 tree t ATTRIBUTE_UNUSED; 114{ 115 return -1; 116} 117 118/* Provide a hook routine for alias sets that always returns 0. This is 119 used by languages that haven't deal with alias sets yet. */ 120 121HOST_WIDE_INT 122hook_get_alias_set_0 (t) 123 tree t ATTRIBUTE_UNUSED; 124{ 125 return 0; 126} 127 128/* lang_hooks.tree_inlining.walk_subtrees is called by walk_tree() 129 after handling common cases, but before walking code-specific 130 sub-trees. If this hook is overridden for a language, it should 131 handle language-specific tree codes, as well as language-specific 132 information associated to common tree codes. If a tree node is 133 completely handled within this function, it should set *SUBTREES to 134 0, so that generic handling isn't attempted. For language-specific 135 tree codes, generic handling would abort(), so make sure it is set 136 properly. Both SUBTREES and *SUBTREES is guaranteed to be non-zero 137 when the function is called. */ 138 139tree 140lhd_tree_inlining_walk_subtrees (tp,subtrees,func,data,htab) 141 tree *tp ATTRIBUTE_UNUSED; 142 int *subtrees ATTRIBUTE_UNUSED; 143 walk_tree_fn func ATTRIBUTE_UNUSED; 144 void *data ATTRIBUTE_UNUSED; 145 void *htab ATTRIBUTE_UNUSED; 146{ 147 return NULL_TREE; 148} 149 150/* lang_hooks.tree_inlining.cannot_inline_tree_fn is called to 151 determine whether there are language-specific reasons for not 152 inlining a given function. */ 153 154int 155lhd_tree_inlining_cannot_inline_tree_fn (fnp) 156 tree *fnp ATTRIBUTE_UNUSED; 157{ 158 return 0; 159} 160 161/* lang_hooks.tree_inlining.disregard_inline_limits is called to 162 determine whether a function should be considered for inlining even 163 if it would exceed inlining limits. */ 164 165int 166lhd_tree_inlining_disregard_inline_limits (fn) 167 tree fn ATTRIBUTE_UNUSED; 168{ 169 return 0; 170} 171 172/* lang_hooks.tree_inlining.add_pending_fn_decls is called before 173 starting to inline a function, to push any language-specific 174 functions that should not be inlined into the current function, 175 into VAFNP. PFN is the top of varray, and should be returned if no 176 functions are pushed into VAFNP. The top of the varray should be 177 returned. */ 178 179tree 180lhd_tree_inlining_add_pending_fn_decls (vafnp, pfn) 181 void *vafnp ATTRIBUTE_UNUSED; 182 tree pfn; 183{ 184 return pfn; 185} 186 187/* lang_hooks.tree_inlining.tree_chain_matters_p indicates whether the 188 TREE_CHAIN of a language-specific tree node is relevant, i.e., 189 whether it should be walked, copied and preserved across copies. */ 190 191int 192lhd_tree_inlining_tree_chain_matters_p (t) 193 tree t ATTRIBUTE_UNUSED; 194{ 195 return 0; 196} 197 198/* lang_hooks.tree_inlining.auto_var_in_fn_p is called to determine 199 whether VT is an automatic variable defined in function FT. */ 200 201int 202lhd_tree_inlining_auto_var_in_fn_p (var, fn) 203 tree var, fn; 204{ 205 return (DECL_P (var) && DECL_CONTEXT (var) == fn 206 && (((TREE_CODE (var) == VAR_DECL || TREE_CODE (var) == PARM_DECL) 207 && ! TREE_STATIC (var)) 208 || TREE_CODE (var) == LABEL_DECL 209 || TREE_CODE (var) == RESULT_DECL)); 210} 211 212/* lang_hooks.tree_inlining.copy_res_decl_for_inlining should return a 213 declaration for the result RES of function FN to be inlined into 214 CALLER. NDP points to an integer that should be set in case a new 215 declaration wasn't created (presumably because RES was of aggregate 216 type, such that a TARGET_EXPR is used for the result). TEXPS is a 217 pointer to a varray with the stack of TARGET_EXPRs seen while 218 inlining functions into caller; the top of TEXPS is supposed to 219 match RES. */ 220 221tree 222lhd_tree_inlining_copy_res_decl_for_inlining (res, fn, caller, 223 dm, ndp, texps) 224 tree res, fn, caller; 225 void *dm ATTRIBUTE_UNUSED; 226 int *ndp ATTRIBUTE_UNUSED; 227 void *texps ATTRIBUTE_UNUSED; 228{ 229 return copy_decl_for_inlining (res, fn, caller); 230} 231 232/* lang_hooks.tree_inlining.anon_aggr_type_p determines whether T is a 233 type node representing an anonymous aggregate (union, struct, etc), 234 i.e., one whose members are in the same scope as the union itself. */ 235 236int 237lhd_tree_inlining_anon_aggr_type_p (t) 238 tree t ATTRIBUTE_UNUSED; 239{ 240 return 0; 241} 242 243/* lang_hooks.tree_inlining.start_inlining and end_inlining perform any 244 language-specific bookkeeping necessary for processing 245 FN. start_inlining returns non-zero if inlining should proceed, zero if 246 not. 247 248 For instance, the C++ version keeps track of template instantiations to 249 avoid infinite recursion. */ 250 251int 252lhd_tree_inlining_start_inlining (fn) 253 tree fn ATTRIBUTE_UNUSED; 254{ 255 return 1; 256} 257 258void 259lhd_tree_inlining_end_inlining (fn) 260 tree fn ATTRIBUTE_UNUSED; 261{ 262} 263 264/* lang_hooks.tree_dump.dump_tree: Dump language-specific parts of tree 265 nodes. Returns non-zero if it does not want the usual dumping of the 266 second argument. */ 267 268int 269lhd_tree_dump_dump_tree (di, t) 270 void *di ATTRIBUTE_UNUSED; 271 tree t ATTRIBUTE_UNUSED; 272{ 273 return 0; 274} 275 276/* lang_hooks.tree_dump.type_qual: Determine type qualifiers in a 277 language-specific way. */ 278 279int 280lhd_tree_dump_type_quals (t) 281 tree t; 282{ 283 return TYPE_QUALS (t); 284} 285 286