gcc/langhooks.c

   1 /* Default language-specific hooks.
   2    Copyright (C) 2001-2015 Free Software Foundation, Inc.
   3    Contributed by Alexandre Oliva  <aoliva@redhat.com>
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #include "config.h"
  22 #include "system.h"
  23 #include "coretypes.h"
  24 #include "intl.h"
  25 #include "tm.h"
  26 #include "toplev.h"
  27 #include "alias.h"
  28 #include "symtab.h"
  29 #include "tree.h"
  30 #include "stringpool.h"
  31 #include "attribs.h"
  32 #include "tree-inline.h"
  33 #include "gimplify.h"
  34 #include "rtl.h"
  35 #include "insn-config.h"
  36 #include "flags.h"
  37 #include "langhooks.h"
  38 #include "target.h"
  39 #include "langhooks-def.h"
  40 #include "diagnostic.h"
  41 #include "tree-diagnostic.h"
  42 #include "plugin-api.h"
  43 #include "hard-reg-set.h"
  44 #include "function.h"
  45 #include "ipa-ref.h"
  46 #include "cgraph.h"
  47 #include "timevar.h"
  48 #include "output.h"
  49
  50 /* Do nothing; in many cases the default hook.  */
  51
  52 void
  53 lhd_do_nothing (void)
  54 {
  55 }
  56
  57 /* Do nothing (tree).  */
  58
  59 void
  60 lhd_do_nothing_t (tree ARG_UNUSED (t))
  61 {
  62 }
  63
  64 /* Pass through (tree).  */
  65 tree
  66 lhd_pass_through_t (tree t)
  67 {
  68   return t;
  69 }
  70
  71 /* Do nothing (int, int, int).  Return NULL_TREE.  */
  72
  73 tree
  74 lhd_do_nothing_iii_return_null_tree (int ARG_UNUSED (i),
  75                                      int ARG_UNUSED (j),
  76                                      int ARG_UNUSED (k))
  77 {
  78   return NULL_TREE;
  79 }
  80
  81 /* Do nothing (function).  */
  82
  83 void
  84 lhd_do_nothing_f (struct function * ARG_UNUSED (f))
  85 {
  86 }
  87
  88 /* Do nothing (return NULL_TREE).  */
  89
  90 tree
  91 lhd_return_null_tree_v (void)
  92 {
  93   return NULL_TREE;
  94 }
  95
  96 /* Do nothing (return NULL_TREE).  */
  97
  98 tree
  99 lhd_return_null_tree (tree ARG_UNUSED (t))
 100 {
 101   return NULL_TREE;
 102 }
 103
 104 /* Do nothing (return NULL_TREE).  */
 105
 106 tree
 107 lhd_return_null_const_tree (const_tree ARG_UNUSED (t))
 108 {
 109   return NULL_TREE;
 110 }
 111
 112 /* The default post options hook.  */
 113
 114 bool
 115 lhd_post_options (const char ** ARG_UNUSED (pfilename))
 116 {
 117   /* Excess precision other than "fast" requires front-end
 118      support.  */
 119   flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
 120   return false;
 121 }
 122
 123 /* Called from by print-tree.c.  */
 124
 125 void
 126 lhd_print_tree_nothing (FILE * ARG_UNUSED (file),
 127                         tree ARG_UNUSED (node),
 128                         int ARG_UNUSED (indent))
 129 {
 130 }
 131
 132 /* Called from check_global_declaration.  */
 133
 134 bool
 135 lhd_warn_unused_global_decl (const_tree decl)
 136 {
 137   /* This is what used to exist in check_global_declaration.  Probably
 138      not many of these actually apply to non-C languages.  */
 139
 140   if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl))
 141     return false;
 142   if (TREE_CODE (decl) == VAR_DECL && TREE_READONLY (decl))
 143     return false;
 144   if (DECL_IN_SYSTEM_HEADER (decl))
 145     return false;
 146
 147   return true;
 148 }
 149
 150 /* Set the DECL_ASSEMBLER_NAME for DECL.  */
 151 void
 152 lhd_set_decl_assembler_name (tree decl)
 153 {
 154   tree id;
 155
 156   /* set_decl_assembler_name may be called on TYPE_DECL to record ODR
 157      name for C++ types.  By default types have no ODR names.  */
 158   if (TREE_CODE (decl) == TYPE_DECL)
 159     return;
 160
 161   /* The language-independent code should never use the
 162      DECL_ASSEMBLER_NAME for lots of DECLs.  Only FUNCTION_DECLs and
 163      VAR_DECLs for variables with static storage duration need a real
 164      DECL_ASSEMBLER_NAME.  */
 165   gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
 166               || (TREE_CODE (decl) == VAR_DECL
 167                   && (TREE_STATIC (decl)
 168                       || DECL_EXTERNAL (decl)
 169                       || TREE_PUBLIC (decl))));
 170
 171   /* By default, assume the name to use in assembly code is the same
 172      as that used in the source language.  (That's correct for C, and
 173      GCC used to set DECL_ASSEMBLER_NAME to the same value as
 174      DECL_NAME in build_decl, so this choice provides backwards
 175      compatibility with existing front-ends.  This assumption is wrapped
 176      in a target hook, to allow for target-specific modification of the
 177      identifier.
 178
 179      Can't use just the variable's own name for a variable whose scope
 180      is less than the whole compilation.  Concatenate a distinguishing
 181      number - we use the DECL_UID.  */
 182
 183   if (TREE_PUBLIC (decl) || DECL_FILE_SCOPE_P (decl))
 184     id = targetm.mangle_decl_assembler_name (decl, DECL_NAME (decl));
 185   else
 186     {
 187       const char *name = IDENTIFIER_POINTER (DECL_NAME (decl));
 188       char *label;
 189
 190       ASM_FORMAT_PRIVATE_NAME (label, name, DECL_UID (decl));
 191       id = get_identifier (label);
 192     }
 193   SET_DECL_ASSEMBLER_NAME (decl, id);
 194
 195 }
 196
 197 /* Type promotion for variable arguments.  */
 198 tree
 199 lhd_type_promotes_to (tree ARG_UNUSED (type))
 200 {
 201   gcc_unreachable ();
 202 }
 203
 204 /* Registration of machine- or os-specific builtin types.  */
 205 void
 206 lhd_register_builtin_type (tree ARG_UNUSED (type),
 207                            const char * ARG_UNUSED (name))
 208 {
 209 }
 210
 211 /* Invalid use of an incomplete type.  */
 212 void
 213 lhd_incomplete_type_error (const_tree ARG_UNUSED (value), const_tree type)
 214 {
 215   gcc_assert (TREE_CODE (type) == ERROR_MARK);
 216   return;
 217 }
 218
 219 /* Provide a default routine for alias sets that always returns -1.  This
 220    is used by languages that don't need to do anything special.  */
 221
 222 alias_set_type
 223 lhd_get_alias_set (tree ARG_UNUSED (t))
 224 {
 225   return -1;
 226 }
 227
 228 /* This is the default decl_printable_name function.  */
 229
 230 const char *
 231 lhd_decl_printable_name (tree decl, int ARG_UNUSED (verbosity))
 232 {
 233   gcc_assert (decl && DECL_NAME (decl));
 234   return IDENTIFIER_POINTER (DECL_NAME (decl));
 235 }
 236
 237 /* This is the default dwarf_name function.  */
 238
 239 const char *
 240 lhd_dwarf_name (tree t, int verbosity)
 241 {
 242   gcc_assert (DECL_P (t));
 243
 244   return lang_hooks.decl_printable_name (t, verbosity);
 245 }
 246
 247 /* This compares two types for equivalence ("compatible" in C-based languages).
 248    This routine should only return 1 if it is sure.  It should not be used
 249    in contexts where erroneously returning 0 causes problems.  */
 250
 251 int
 252 lhd_types_compatible_p (tree x, tree y)
 253 {
 254   return TYPE_MAIN_VARIANT (x) == TYPE_MAIN_VARIANT (y);
 255 }
 256
 257 /* lang_hooks.tree_dump.dump_tree:  Dump language-specific parts of tree
 258    nodes.  Returns nonzero if it does not want the usual dumping of the
 259    second argument.  */
 260
 261 bool
 262 lhd_tree_dump_dump_tree (void *di ATTRIBUTE_UNUSED, tree t ATTRIBUTE_UNUSED)
 263 {
 264   return false;
 265 }
 266
 267 /* lang_hooks.tree_dump.type_qual:  Determine type qualifiers in a
 268    language-specific way.  */
 269
 270 int
 271 lhd_tree_dump_type_quals (const_tree t)
 272 {
 273   return TYPE_QUALS (t);
 274 }
 275
 276 /* lang_hooks.gimplify_expr re-writes *EXPR_P into GIMPLE form.  */
 277
 278 int
 279 lhd_gimplify_expr (tree *expr_p ATTRIBUTE_UNUSED,
 280                    gimple_seq *pre_p ATTRIBUTE_UNUSED,
 281                    gimple_seq *post_p ATTRIBUTE_UNUSED)
 282 {
 283   return GS_UNHANDLED;
 284 }
 285
 286 /* lang_hooks.tree_size: Determine the size of a tree with code C,
 287    which is a language-specific tree code in category tcc_constant or
 288    tcc_exceptional.  The default expects never to be called.  */
 289 size_t
 290 lhd_tree_size (enum tree_code c ATTRIBUTE_UNUSED)
 291 {
 292   gcc_unreachable ();
 293 }
 294
 295 /* Return true if decl, which is a function decl, may be called by a
 296    sibcall.  */
 297
 298 bool
 299 lhd_decl_ok_for_sibcall (const_tree decl ATTRIBUTE_UNUSED)
 300 {
 301   return true;
 302 }
 303
 304 /* Generic global declaration processing.  This is meant to be called
 305    by the front-ends at the end of parsing.  C/C++ do their own thing,
 306    but other front-ends may call this.  */
 307
 308 void
 309 global_decl_processing (void)
 310 {
 311   tree globals, decl, *vec;
 312   int len, i;
 313
 314   timevar_stop (TV_PHASE_PARSING);
 315   timevar_start (TV_PHASE_DEFERRED);
 316   /* Really define vars that have had only a tentative definition.
 317      Really output inline functions that must actually be callable
 318      and have not been output so far.  */
 319
 320   globals = lang_hooks.decls.getdecls ();
 321   len = list_length (globals);
 322   vec = XNEWVEC (tree, len);
 323
 324   /* Process the decls in reverse order--earliest first.
 325      Put them into VEC from back to front, then take out from front.  */
 326
 327   for (i = 0, decl = globals; i < len; i++, decl = DECL_CHAIN (decl))
 328     vec[len - i - 1] = decl;
 329
 330   wrapup_global_declarations (vec, len);
 331   timevar_stop (TV_PHASE_DEFERRED);
 332
 333   timevar_start (TV_PHASE_PARSING);
 334   free (vec);
 335 }
 336
 337 /* Called to perform language-specific initialization of CTX.  */
 338 void
 339 lhd_initialize_diagnostics (diagnostic_context *ctx ATTRIBUTE_UNUSED)
 340 {
 341 }
 342
 343 /* Called to perform language-specific options initialization.  */
 344 void
 345 lhd_init_options (unsigned int decoded_options_count ATTRIBUTE_UNUSED,
 346                   struct cl_decoded_option *decoded_options ATTRIBUTE_UNUSED)
 347 {
 348 }
 349
 350 /* By default, always complain about options for the wrong language.  */
 351 bool
 352 lhd_complain_wrong_lang_p (const struct cl_option *option ATTRIBUTE_UNUSED)
 353 {
 354   return true;
 355 }
 356
 357 /* By default, no language-specific options are valid.  */
 358 bool
 359 lhd_handle_option (size_t code ATTRIBUTE_UNUSED,
 360                    const char *arg ATTRIBUTE_UNUSED,
 361                    int value ATTRIBUTE_UNUSED, int kind ATTRIBUTE_UNUSED,
 362                    location_t loc ATTRIBUTE_UNUSED,
 363                    const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
 364 {
 365   return false;
 366 }
 367
 368 /* The default function to print out name of current function that caused
 369    an error.  */
 370 void
 371 lhd_print_error_function (diagnostic_context *context, const char *file,
 372                           diagnostic_info *diagnostic)
 373 {
 374   if (diagnostic_last_function_changed (context, diagnostic))
 375     {
 376       const char *old_prefix = context->printer->prefix;
 377       tree abstract_origin = diagnostic_abstract_origin (diagnostic);
 378       char *new_prefix = (file && abstract_origin == NULL)
 379                          ? file_name_as_prefix (context, file) : NULL;
 380
 381       pp_set_prefix (context->printer, new_prefix);
 382
 383       if (current_function_decl == NULL)
 384         pp_printf (context->printer, _("At top level:"));
 385       else
 386         {
 387           tree fndecl, ao;
 388
 389           if (abstract_origin)
 390             {
 391               ao = BLOCK_ABSTRACT_ORIGIN (abstract_origin);
 392               while (TREE_CODE (ao) == BLOCK
 393                      && BLOCK_ABSTRACT_ORIGIN (ao)
 394                      && BLOCK_ABSTRACT_ORIGIN (ao) != ao)
 395                 ao = BLOCK_ABSTRACT_ORIGIN (ao);
 396               gcc_assert (TREE_CODE (ao) == FUNCTION_DECL);
 397               fndecl = ao;
 398             }
 399           else
 400             fndecl = current_function_decl;
 401
 402           if (TREE_CODE (TREE_TYPE (fndecl)) == METHOD_TYPE)
 403             pp_printf
 404               (context->printer, _("In member function %qs"),
 405                identifier_to_locale (lang_hooks.decl_printable_name (fndecl, 2)));
 406           else
 407             pp_printf
 408               (context->printer, _("In function %qs"),
 409                identifier_to_locale (lang_hooks.decl_printable_name (fndecl, 2)));
 410
 411           while (abstract_origin)
 412             {
 413               location_t *locus;
 414               tree block = abstract_origin;
 415
 416               locus = &BLOCK_SOURCE_LOCATION (block);
 417               fndecl = NULL;
 418               block = BLOCK_SUPERCONTEXT (block);
 419               while (block && TREE_CODE (block) == BLOCK
 420                      && BLOCK_ABSTRACT_ORIGIN (block))
 421                 {
 422                   ao = BLOCK_ABSTRACT_ORIGIN (block);
 423
 424                   while (TREE_CODE (ao) == BLOCK
 425                          && BLOCK_ABSTRACT_ORIGIN (ao)
 426                          && BLOCK_ABSTRACT_ORIGIN (ao) != ao)
 427                     ao = BLOCK_ABSTRACT_ORIGIN (ao);
 428
 429                   if (TREE_CODE (ao) == FUNCTION_DECL)
 430                     {
 431                       fndecl = ao;
 432                       break;
 433                     }
 434                   else if (TREE_CODE (ao) != BLOCK)
 435                     break;
 436
 437                   block = BLOCK_SUPERCONTEXT (block);
 438                 }
 439               if (fndecl)
 440                 abstract_origin = block;
 441               else
 442                 {
 443                   while (block && TREE_CODE (block) == BLOCK)
 444                     block = BLOCK_SUPERCONTEXT (block);
 445
 446                   if (block && TREE_CODE (block) == FUNCTION_DECL)
 447                     fndecl = block;
 448                   abstract_origin = NULL;
 449                 }
 450               if (fndecl)
 451                 {
 452                   expanded_location s = expand_location (*locus);
 453                   pp_comma (context->printer);
 454                   pp_newline (context->printer);
 455                   if (s.file != NULL)
 456                     {
 457                       if (context->show_column)
 458                         pp_printf (context->printer,
 459                                    _("    inlined from %qs at %r%s:%d:%d%R"),
 460                                    identifier_to_locale (lang_hooks.decl_printable_name (fndecl, 2)),
 461                                    "locus", s.file, s.line, s.column);
 462                       else
 463                         pp_printf (context->printer,
 464                                    _("    inlined from %qs at %r%s:%d%R"),
 465                                    identifier_to_locale (lang_hooks.decl_printable_name (fndecl, 2)),
 466                                    "locus", s.file, s.line);
 467
 468                     }
 469                   else
 470                     pp_printf (context->printer, _("    inlined from %qs"),
 471                                identifier_to_locale (lang_hooks.decl_printable_name (fndecl, 2)));
 472                 }
 473             }
 474           pp_colon (context->printer);
 475         }
 476
 477       diagnostic_set_last_function (context, diagnostic);
 478       pp_newline_and_flush (context->printer);
 479       context->printer->prefix = old_prefix;
 480       free ((char*) new_prefix);
 481     }
 482 }
 483
 484 tree
 485 lhd_make_node (enum tree_code code)
 486 {
 487   return make_node (code);
 488 }
 489
 490 HOST_WIDE_INT
 491 lhd_to_target_charset (HOST_WIDE_INT c)
 492 {
 493   return c;
 494 }
 495
 496 tree
 497 lhd_expr_to_decl (tree expr, bool *tc ATTRIBUTE_UNUSED, bool *se ATTRIBUTE_UNUSED)
 498 {
 499   return expr;
 500 }
 501
 502 /* Return sharing kind if OpenMP sharing attribute of DECL is
 503    predetermined, OMP_CLAUSE_DEFAULT_UNSPECIFIED otherwise.  */
 504
 505 enum omp_clause_default_kind
 506 lhd_omp_predetermined_sharing (tree decl ATTRIBUTE_UNUSED)
 507 {
 508   if (DECL_ARTIFICIAL (decl))
 509     return OMP_CLAUSE_DEFAULT_SHARED;
 510   return OMP_CLAUSE_DEFAULT_UNSPECIFIED;
 511 }
 512
 513 /* Generate code to copy SRC to DST.  */
 514
 515 tree
 516 lhd_omp_assignment (tree clause ATTRIBUTE_UNUSED, tree dst, tree src)
 517 {
 518   return build2 (MODIFY_EXPR, TREE_TYPE (dst), dst, src);
 519 }
 520
 521 /* Finalize clause C.  */
 522
 523 void
 524 lhd_omp_finish_clause (tree, gimple_seq *)
 525 {
 526 }
 527
 528 /* Register language specific type size variables as potentially OpenMP
 529    firstprivate variables.  */
 530
 531 void
 532 lhd_omp_firstprivatize_type_sizes (struct gimplify_omp_ctx *c ATTRIBUTE_UNUSED,
 533                                    tree t ATTRIBUTE_UNUSED)
 534 {
 535 }
 536
 537 /* Return true if TYPE is an OpenMP mappable type.  */
 538
 539 bool
 540 lhd_omp_mappable_type (tree type)
 541 {
 542   /* Mappable type has to be complete.  */
 543   if (type == error_mark_node || !COMPLETE_TYPE_P (type))
 544     return false;
 545   return true;
 546 }
 547
 548 /* Common function for add_builtin_function and
 549    add_builtin_function_ext_scope.  */
 550 static tree
 551 add_builtin_function_common (const char *name,
 552                              tree type,
 553                              int function_code,
 554                              enum built_in_class cl,
 555                              const char *library_name,
 556                              tree attrs,
 557                              tree (*hook) (tree))
 558 {
 559   tree   id = get_identifier (name);
 560   tree decl = build_decl (BUILTINS_LOCATION, FUNCTION_DECL, id, type);
 561
 562   TREE_PUBLIC (decl)         = 1;
 563   DECL_EXTERNAL (decl)       = 1;
 564   DECL_BUILT_IN_CLASS (decl) = cl;
 565
 566   DECL_FUNCTION_CODE (decl)  = (enum built_in_function) function_code;
 567
 568   /* DECL_FUNCTION_CODE is a bitfield; verify that the value fits.  */
 569   gcc_assert (DECL_FUNCTION_CODE (decl) == function_code);
 570
 571   if (library_name)
 572     {
 573       tree libname = get_identifier (library_name);
 574       SET_DECL_ASSEMBLER_NAME (decl, libname);
 575     }
 576
 577   /* Possibly apply some default attributes to this built-in function.  */
 578   if (attrs)
 579     decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
 580   else
 581     decl_attributes (&decl, NULL_TREE, 0);
 582
 583   return hook (decl);
 584
 585 }
 586
 587 /* Create a builtin function.  */
 588
 589 tree
 590 add_builtin_function (const char *name,
 591                       tree type,
 592                       int function_code,
 593                       enum built_in_class cl,
 594                       const char *library_name,
 595                       tree attrs)
 596 {
 597   return add_builtin_function_common (name, type, function_code, cl,
 598                                       library_name, attrs,
 599                                       lang_hooks.builtin_function);
 600 }
 601
 602 /* Like add_builtin_function, but make sure the scope is the external scope.
 603    This is used to delay putting in back end builtin functions until the ISA
 604    that defines the builtin is declared via function specific target options,
 605    which can save memory for machines like the x86_64 that have multiple ISAs.
 606    If this points to the same function as builtin_function, the backend must
 607    add all of the builtins at program initialization time.  */
 608
 609 tree
 610 add_builtin_function_ext_scope (const char *name,
 611                                 tree type,
 612                                 int function_code,
 613                                 enum built_in_class cl,
 614                                 const char *library_name,
 615                                 tree attrs)
 616 {
 617   return add_builtin_function_common (name, type, function_code, cl,
 618                                       library_name, attrs,
 619                                       lang_hooks.builtin_function_ext_scope);
 620 }
 621
 622 tree
 623 lhd_builtin_function (tree decl)
 624 {
 625   lang_hooks.decls.pushdecl (decl);
 626   return decl;
 627 }
 628
 629 /* Create a builtin type.  */
 630
 631 tree
 632 add_builtin_type (const char *name, tree type)
 633 {
 634   tree   id = get_identifier (name);
 635   tree decl = build_decl (BUILTINS_LOCATION, TYPE_DECL, id, type);
 636   return lang_hooks.decls.pushdecl (decl);
 637 }
 638
 639 /* LTO hooks.  */
 640
 641 /* Used to save and restore any previously active section.  */
 642 static section *saved_section;
 643
 644
 645 /* Begin a new LTO output section named NAME.  This default implementation
 646    saves the old section and emits assembly code to switch to the new
 647    section.  */
 648
 649 void
 650 lhd_begin_section (const char *name)
 651 {
 652   section *section;
 653
 654   /* Save the old section so we can restore it in lto_end_asm_section.  */
 655   gcc_assert (!saved_section);
 656   saved_section = in_section;
 657   if (!saved_section)
 658     saved_section = text_section;
 659
 660   /* Create a new section and switch to it.  */
 661   section = get_section (name, SECTION_DEBUG | SECTION_EXCLUDE, NULL);
 662   switch_to_section (section);
 663 }
 664
 665
 666 /* Write DATA of length LEN to the current LTO output section.  This default
 667    implementation just calls assemble_string.  */
 668
 669 void
 670 lhd_append_data (const void *data, size_t len, void *)
 671 {
 672   if (data)
 673     assemble_string ((const char *)data, len);
 674 }
 675
 676
 677 /* Finish the current LTO output section.  This default implementation emits
 678    assembly code to switch to any section previously saved by
 679    lhd_begin_section.  */
 680
 681 void
 682 lhd_end_section (void)
 683 {
 684   if (saved_section)
 685     {
 686       switch_to_section (saved_section);
 687       saved_section = NULL;
 688     }
 689 }
 690
 691 /* Default implementation of enum_underlying_base_type using type_for_size.  */
 692
 693 tree
 694 lhd_enum_underlying_base_type (const_tree enum_type)
 695 {
 696   return lang_hooks.types.type_for_size (TYPE_PRECISION (enum_type),
 697                                          TYPE_UNSIGNED (enum_type));
 698 }
 699
 700 /* Returns true if the current lang_hooks represents the GNU C frontend.  */
 701
 702 bool
 703 lang_GNU_C (void)
 704 {
 705   return (strncmp (lang_hooks.name, "GNU C", 5) == 0
 706           && (lang_hooks.name[5] == '\0' || ISDIGIT (lang_hooks.name[5])));
 707 }
 708
 709 /* Returns true if the current lang_hooks represents the GNU C++ frontend.  */
 710
 711 bool
 712 lang_GNU_CXX (void)
 713 {
 714   return strncmp (lang_hooks.name, "GNU C++", 7) == 0;
 715 }
 716
 717 /* Returns true if the current lang_hooks represents the GNU Fortran frontend.  */
 718
 719 bool
 720 lang_GNU_Fortran (void)
 721 {
 722   return strncmp (lang_hooks.name, "GNU Fortran", 11) == 0;
 723 }