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