langhooks.c revision 132718
1/* Default language-specific hooks. 2 Copyright 2001, 2002, 2003, 2004 Free Software Foundation, Inc. 3 Contributed by Alexandre Oliva <aoliva@redhat.com> 4 5This file is part of GCC. 6 7GCC 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 12GCC 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 GCC; 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 "coretypes.h" 25#include "tm.h" 26#include "toplev.h" 27#include "tree.h" 28#include "tree-inline.h" 29#include "rtl.h" 30#include "insn-config.h" 31#include "integrate.h" 32#include "flags.h" 33#include "langhooks.h" 34#include "langhooks-def.h" 35#include "ggc.h" 36#include "diagnostic.h" 37 38/* Do nothing; in many cases the default hook. */ 39 40void 41lhd_do_nothing (void) 42{ 43} 44 45/* Do nothing (tree). */ 46 47void 48lhd_do_nothing_t (tree t ATTRIBUTE_UNUSED) 49{ 50} 51 52/* Do nothing (int). */ 53 54void 55lhd_do_nothing_i (int i ATTRIBUTE_UNUSED) 56{ 57} 58 59/* Do nothing (int, int, int). Return NULL_TREE. */ 60 61tree 62lhd_do_nothing_iii_return_null_tree (int i ATTRIBUTE_UNUSED, 63 int j ATTRIBUTE_UNUSED, 64 int k ATTRIBUTE_UNUSED) 65{ 66 return NULL_TREE; 67} 68 69/* Do nothing (function). */ 70 71void 72lhd_do_nothing_f (struct function *f ATTRIBUTE_UNUSED) 73{ 74} 75 76/* Do nothing (return the tree node passed). */ 77 78tree 79lhd_return_tree (tree t) 80{ 81 return t; 82} 83 84/* Do nothing (return NULL_TREE). */ 85 86tree 87lhd_return_null_tree_v (void) 88{ 89 return NULL_TREE; 90} 91 92/* Do nothing (return NULL_TREE). */ 93 94tree 95lhd_return_null_tree (tree t ATTRIBUTE_UNUSED) 96{ 97 return NULL_TREE; 98} 99 100/* The default post options hook. */ 101 102bool 103lhd_post_options (const char **pfilename ATTRIBUTE_UNUSED) 104{ 105 return false; 106} 107 108/* Called from by print-tree.c. */ 109 110void 111lhd_print_tree_nothing (FILE *file ATTRIBUTE_UNUSED, 112 tree node ATTRIBUTE_UNUSED, 113 int indent ATTRIBUTE_UNUSED) 114{ 115} 116 117/* Called from safe_from_p. */ 118 119int 120lhd_safe_from_p (rtx x ATTRIBUTE_UNUSED, tree exp ATTRIBUTE_UNUSED) 121{ 122 return 1; 123} 124 125/* Called from unsafe_for_reeval. */ 126 127int 128lhd_unsafe_for_reeval (tree t ATTRIBUTE_UNUSED) 129{ 130 return -1; 131} 132 133/* Called from staticp. */ 134 135int 136lhd_staticp (tree exp ATTRIBUTE_UNUSED) 137{ 138 return 0; 139} 140 141/* Called from check_global_declarations. */ 142 143bool 144lhd_warn_unused_global_decl (tree decl) 145{ 146 /* This is what used to exist in check_global_declarations. Probably 147 not many of these actually apply to non-C languages. */ 148 149 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl)) 150 return false; 151 if (TREE_CODE (decl) == VAR_DECL && TREE_READONLY (decl)) 152 return false; 153 if (DECL_IN_SYSTEM_HEADER (decl)) 154 return false; 155 156 return true; 157} 158 159/* Number for making the label on the next 160 static variable internal to a function. */ 161 162static GTY(()) int var_labelno; 163 164/* Set the DECL_ASSEMBLER_NAME for DECL. */ 165void 166lhd_set_decl_assembler_name (tree decl) 167{ 168 /* The language-independent code should never use the 169 DECL_ASSEMBLER_NAME for lots of DECLs. Only FUNCTION_DECLs and 170 VAR_DECLs for variables with static storage duration need a real 171 DECL_ASSEMBLER_NAME. */ 172 if (TREE_CODE (decl) == FUNCTION_DECL 173 || (TREE_CODE (decl) == VAR_DECL 174 && (TREE_STATIC (decl) 175 || DECL_EXTERNAL (decl) 176 || TREE_PUBLIC (decl)))) 177 { 178 /* By default, assume the name to use in assembly code is the 179 same as that used in the source language. (That's correct 180 for C, and GCC used to set DECL_ASSEMBLER_NAME to the same 181 value as DECL_NAME in build_decl, so this choice provides 182 backwards compatibility with existing front-ends. 183 184 Can't use just the variable's own name for a variable whose 185 scope is less than the whole compilation. Concatenate a 186 distinguishing number. */ 187 if (!TREE_PUBLIC (decl) && DECL_CONTEXT (decl)) 188 { 189 const char *name = IDENTIFIER_POINTER (DECL_NAME (decl)); 190 char *label; 191 192 ASM_FORMAT_PRIVATE_NAME (label, name, var_labelno); 193 var_labelno++; 194 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (label)); 195 } 196 else 197 SET_DECL_ASSEMBLER_NAME (decl, DECL_NAME (decl)); 198 } 199 else 200 /* Nobody should ever be asking for the DECL_ASSEMBLER_NAME of 201 these DECLs -- unless they're in language-dependent code, in 202 which case set_decl_assembler_name hook should handle things. */ 203 abort (); 204} 205 206/* By default we always allow bit-field based optimizations. */ 207bool 208lhd_can_use_bit_fields_p (void) 209{ 210 return true; 211} 212 213/* Provide a default routine to clear the binding stack. This is used 214 by languages that don't need to do anything special. */ 215void 216lhd_clear_binding_stack (void) 217{ 218 while (! (*lang_hooks.decls.global_bindings_p) ()) 219 poplevel (0, 0, 0); 220} 221 222/* Type promotion for variable arguments. */ 223tree 224lhd_type_promotes_to (tree type ATTRIBUTE_UNUSED) 225{ 226 abort (); 227} 228 229/* Registration of machine- or os-specific builtin types. */ 230void 231lhd_register_builtin_type (tree type ATTRIBUTE_UNUSED, 232 const char* name ATTRIBUTE_UNUSED) 233{ 234} 235 236/* Invalid use of an incomplete type. */ 237void 238lhd_incomplete_type_error (tree value ATTRIBUTE_UNUSED, tree type) 239{ 240 if (TREE_CODE (type) == ERROR_MARK) 241 return; 242 243 abort (); 244} 245 246/* Provide a default routine for alias sets that always returns -1. This 247 is used by languages that don't need to do anything special. */ 248 249HOST_WIDE_INT 250lhd_get_alias_set (tree t ATTRIBUTE_UNUSED) 251{ 252 return -1; 253} 254 255/* Provide a hook routine for alias sets that always returns 0. This is 256 used by languages that haven't deal with alias sets yet. */ 257 258HOST_WIDE_INT 259hook_get_alias_set_0 (tree t ATTRIBUTE_UNUSED) 260{ 261 return 0; 262} 263 264/* This is the default expand_expr function. */ 265 266rtx 267lhd_expand_expr (tree t ATTRIBUTE_UNUSED, rtx r ATTRIBUTE_UNUSED, 268 enum machine_mode mm ATTRIBUTE_UNUSED, 269 int em ATTRIBUTE_UNUSED, 270 rtx *a ATTRIBUTE_UNUSED) 271{ 272 abort (); 273} 274 275/* This is the default decl_printable_name function. */ 276 277const char * 278lhd_decl_printable_name (tree decl, int verbosity ATTRIBUTE_UNUSED) 279{ 280 return IDENTIFIER_POINTER (DECL_NAME (decl)); 281} 282 283/* lang_hooks.tree_inlining.walk_subtrees is called by walk_tree() 284 after handling common cases, but before walking code-specific 285 sub-trees. If this hook is overridden for a language, it should 286 handle language-specific tree codes, as well as language-specific 287 information associated to common tree codes. If a tree node is 288 completely handled within this function, it should set *SUBTREES to 289 0, so that generic handling isn't attempted. For language-specific 290 tree codes, generic handling would abort(), so make sure it is set 291 properly. Both SUBTREES and *SUBTREES is guaranteed to be nonzero 292 when the function is called. */ 293 294tree 295lhd_tree_inlining_walk_subtrees (tree *tp ATTRIBUTE_UNUSED, 296 int *subtrees ATTRIBUTE_UNUSED, 297 walk_tree_fn func ATTRIBUTE_UNUSED, 298 void *data ATTRIBUTE_UNUSED, 299 void *htab ATTRIBUTE_UNUSED) 300{ 301 return NULL_TREE; 302} 303 304/* lang_hooks.tree_inlining.cannot_inline_tree_fn is called to 305 determine whether there are language-specific reasons for not 306 inlining a given function. */ 307 308int 309lhd_tree_inlining_cannot_inline_tree_fn (tree *fnp) 310{ 311 if (flag_really_no_inline 312 && lookup_attribute ("always_inline", DECL_ATTRIBUTES (*fnp)) == NULL) 313 return 1; 314 315 return 0; 316} 317 318/* lang_hooks.tree_inlining.disregard_inline_limits is called to 319 determine whether a function should be considered for inlining even 320 if it would exceed inlining limits. */ 321 322int 323lhd_tree_inlining_disregard_inline_limits (tree fn) 324{ 325 if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)) != NULL) 326 return 1; 327 328 return 0; 329} 330 331/* lang_hooks.tree_inlining.add_pending_fn_decls is called before 332 starting to inline a function, to push any language-specific 333 functions that should not be inlined into the current function, 334 into VAFNP. PFN is the top of varray, and should be returned if no 335 functions are pushed into VAFNP. The top of the varray should be 336 returned. */ 337 338tree 339lhd_tree_inlining_add_pending_fn_decls (void *vafnp ATTRIBUTE_UNUSED, tree pfn) 340{ 341 return pfn; 342} 343 344/* lang_hooks.tree_inlining.tree_chain_matters_p indicates whether the 345 TREE_CHAIN of a language-specific tree node is relevant, i.e., 346 whether it should be walked, copied and preserved across copies. */ 347 348int 349lhd_tree_inlining_tree_chain_matters_p (tree t ATTRIBUTE_UNUSED) 350{ 351 return 0; 352} 353 354/* lang_hooks.tree_inlining.auto_var_in_fn_p is called to determine 355 whether VT is an automatic variable defined in function FT. */ 356 357int 358lhd_tree_inlining_auto_var_in_fn_p (tree var, tree fn) 359{ 360 return (DECL_P (var) && DECL_CONTEXT (var) == fn 361 && (((TREE_CODE (var) == VAR_DECL || TREE_CODE (var) == PARM_DECL) 362 && ! TREE_STATIC (var)) 363 || TREE_CODE (var) == LABEL_DECL 364 || TREE_CODE (var) == RESULT_DECL)); 365} 366 367/* lang_hooks.tree_inlining.copy_res_decl_for_inlining should return a 368 declaration for the result RES of function FN to be inlined into 369 CALLER. NDP points to an integer that should be set in case a new 370 declaration wasn't created (presumably because RES was of aggregate 371 type, such that a TARGET_EXPR is used for the result). TEXPS is a 372 pointer to a varray with the stack of TARGET_EXPRs seen while 373 inlining functions into caller; the top of TEXPS is supposed to 374 match RES. */ 375 376tree 377lhd_tree_inlining_copy_res_decl_for_inlining (tree res, tree fn, tree caller, 378 void *dm ATTRIBUTE_UNUSED, 379 int *ndp ATTRIBUTE_UNUSED, 380 tree return_slot_addr ATTRIBUTE_UNUSED) 381{ 382 if (return_slot_addr) 383 return build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (return_slot_addr)), 384 return_slot_addr); 385 else 386 return copy_decl_for_inlining (res, fn, caller); 387} 388 389/* lang_hooks.tree_inlining.anon_aggr_type_p determines whether T is a 390 type node representing an anonymous aggregate (union, struct, etc), 391 i.e., one whose members are in the same scope as the union itself. */ 392 393int 394lhd_tree_inlining_anon_aggr_type_p (tree t ATTRIBUTE_UNUSED) 395{ 396 return 0; 397} 398 399/* lang_hooks.tree_inlining.start_inlining and end_inlining perform any 400 language-specific bookkeeping necessary for processing 401 FN. start_inlining returns nonzero if inlining should proceed, zero if 402 not. 403 404 For instance, the C++ version keeps track of template instantiations to 405 avoid infinite recursion. */ 406 407int 408lhd_tree_inlining_start_inlining (tree fn ATTRIBUTE_UNUSED) 409{ 410 return 1; 411} 412 413void 414lhd_tree_inlining_end_inlining (tree fn ATTRIBUTE_UNUSED) 415{ 416} 417 418/* lang_hooks.tree_inlining.convert_parm_for_inlining performs any 419 language-specific conversion before assigning VALUE to PARM. */ 420 421tree 422lhd_tree_inlining_convert_parm_for_inlining (tree parm ATTRIBUTE_UNUSED, 423 tree value, 424 tree fndecl ATTRIBUTE_UNUSED, 425 int argnum ATTRIBUTE_UNUSED) 426{ 427 return value; 428} 429 430/* lang_hooks.tree_dump.dump_tree: Dump language-specific parts of tree 431 nodes. Returns nonzero if it does not want the usual dumping of the 432 second argument. */ 433 434bool 435lhd_tree_dump_dump_tree (void *di ATTRIBUTE_UNUSED, tree t ATTRIBUTE_UNUSED) 436{ 437 return false; 438} 439 440/* lang_hooks.tree_dump.type_qual: Determine type qualifiers in a 441 language-specific way. */ 442 443int 444lhd_tree_dump_type_quals (tree t) 445{ 446 return TYPE_QUALS (t); 447} 448 449/* lang_hooks.expr_size: Determine the size of the value of an expression T 450 in a language-specific way. Returns a tree for the size in bytes. */ 451 452tree 453lhd_expr_size (tree exp) 454{ 455 if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'd' 456 && DECL_SIZE_UNIT (exp) != 0) 457 return DECL_SIZE_UNIT (exp); 458 else 459 return size_in_bytes (TREE_TYPE (exp)); 460} 461/* lang_hooks.decl_uninit: Find out if a variable is uninitialized based 462 on DECL_INITIAL. */ 463 464bool 465lhd_decl_uninit (tree t ATTRIBUTE_UNUSED) 466{ 467 return false; 468} 469 470/* lang_hooks.tree_size: Determine the size of a tree with code C, 471 which is a language-specific tree code in category 'x'. The 472 default expects never to be called. */ 473size_t 474lhd_tree_size (enum tree_code c ATTRIBUTE_UNUSED) 475{ 476 abort (); 477 return 0; 478} 479 480/* Return true if decl, which is a function decl, may be called by a 481 sibcall. */ 482 483bool 484lhd_decl_ok_for_sibcall (tree decl ATTRIBUTE_UNUSED) 485{ 486 return true; 487} 488 489/* lang_hooks.decls.final_write_globals: perform final processing on 490 global variables. */ 491void 492write_global_declarations (void) 493{ 494 /* Really define vars that have had only a tentative definition. 495 Really output inline functions that must actually be callable 496 and have not been output so far. */ 497 498 tree globals = (*lang_hooks.decls.getdecls) (); 499 int len = list_length (globals); 500 tree *vec = xmalloc (sizeof (tree) * len); 501 int i; 502 tree decl; 503 504 /* Process the decls in reverse order--earliest first. 505 Put them into VEC from back to front, then take out from front. */ 506 507 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl)) 508 vec[len - i - 1] = decl; 509 510 wrapup_global_declarations (vec, len); 511 512 check_global_declarations (vec, len); 513 514 /* Clean up. */ 515 free (vec); 516} 517 518/* Called to perform language-specific initialization of CTX. */ 519void 520lhd_initialize_diagnostics (struct diagnostic_context *ctx ATTRIBUTE_UNUSED) 521{ 522} 523 524/* The default function to print out name of current function that caused 525 an error. */ 526void 527lhd_print_error_function (diagnostic_context *context, const char *file) 528{ 529 if (diagnostic_last_function_changed (context)) 530 { 531 const char *old_prefix = context->printer->prefix; 532 char *new_prefix = file ? file_name_as_prefix (file) : NULL; 533 534 pp_set_prefix (context->printer, new_prefix); 535 536 if (current_function_decl == NULL) 537 pp_printf (context->printer, "At top level:"); 538 else 539 { 540 if (TREE_CODE (TREE_TYPE (current_function_decl)) == METHOD_TYPE) 541 pp_printf 542 (context->printer, "In member function `%s':", 543 (*lang_hooks.decl_printable_name) (current_function_decl, 2)); 544 else 545 pp_printf 546 (context->printer, "In function `%s':", 547 (*lang_hooks.decl_printable_name) (current_function_decl, 2)); 548 } 549 550 diagnostic_set_last_function (context); 551 pp_flush (context->printer); 552 context->printer->prefix = old_prefix; 553 free ((char*) new_prefix); 554 } 555} 556 557tree 558lhd_callgraph_analyze_expr (tree *tp ATTRIBUTE_UNUSED, 559 int *walk_subtrees ATTRIBUTE_UNUSED, 560 tree decl ATTRIBUTE_UNUSED) 561{ 562 return NULL; 563} 564 565#include "gt-langhooks.h" 566