gcc/langhooks.c

   1 /* Default language-specific hooks.
   2    Copyright (C) 2001-2018 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 "target.h"
  25 #include "rtl.h"
  26 #include "tree.h"
  27 #include "timevar.h"
  28 #include "stringpool.h"
  29 #include "diagnostic.h"
  30 #include "intl.h"
  31 #include "toplev.h"
  32 #include "attribs.h"
  33 #include "gimplify.h"
  34 #include "langhooks.h"
  35 #include "tree-diagnostic.h"
  36 #include "output.h"
  37 #include "timevar.h"
  38
  39 /* Do nothing; in many cases the default hook.  */
  40
  41 void
  42 lhd_do_nothing (void)
  43 {
  44 }
  45
  46 /* Do nothing (tree).  */
  47
  48 void
  49 lhd_do_nothing_t (tree ARG_UNUSED (t))
  50 {
  51 }
  52
  53 /* Pass through (tree).  */
  54 tree
  55 lhd_pass_through_t (tree t)
  56 {
  57   return t;
  58 }
  59
  60 /* Do nothing (int, int, int).  Return NULL_TREE.  */
  61
  62 tree
  63 lhd_do_nothing_iii_return_null_tree (int ARG_UNUSED (i),
  64                                      int ARG_UNUSED (j),
  65                                      int ARG_UNUSED (k))
  66 {
  67   return NULL_TREE;
  68 }
  69
  70 /* Do nothing (function).  */
  71
  72 void
  73 lhd_do_nothing_f (struct function * ARG_UNUSED (f))
  74 {
  75 }
  76
  77 /* Do nothing (return NULL_TREE).  */
  78
  79 tree
  80 lhd_return_null_tree (tree ARG_UNUSED (t))
  81 {
  82   return NULL_TREE;
  83 }
  84
  85 /* Do nothing (return NULL_TREE).  */
  86
  87 tree
  88 lhd_return_null_const_tree (const_tree ARG_UNUSED (t))
  89 {
  90   return NULL_TREE;
  91 }
  92
  93 /* The default post options hook.  */
  94
  95 bool
  96 lhd_post_options (const char ** ARG_UNUSED (pfilename))
  97 {
  98   /* Excess precision other than "fast" requires front-end
  99      support.  */
 100   flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
 101   return false;
 102 }
 103
 104 /* Called from by print-tree.c.  */
 105
 106 void
 107 lhd_print_tree_nothing (FILE * ARG_UNUSED (file),
 108                         tree ARG_UNUSED (node),
 109                         int ARG_UNUSED (indent))
 110 {
 111 }
 112
 113 /* Called from check_global_declaration.  */
 114
 115 bool
 116 lhd_warn_unused_global_decl (const_tree decl)
 117 {
 118   /* This is what used to exist in check_global_declaration.  Probably
 119      not many of these actually apply to non-C languages.  */
 120
 121   if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl))
 122     return false;
 123   if (VAR_P (decl) && TREE_READONLY (decl))
 124     return false;
 125   if (DECL_IN_SYSTEM_HEADER (decl))
 126     return false;
 127
 128   return true;
 129 }
 130
 131 /* Set the DECL_ASSEMBLER_NAME for DECL.  */
 132 void
 133 lhd_set_decl_assembler_name (tree decl)
 134 {
 135   tree id;
 136
 137   /* set_decl_assembler_name may be called on TYPE_DECL to record ODR
 138      name for C++ types.  By default types have no ODR names.  */
 139   if (TREE_CODE (decl) == TYPE_DECL)
 140     return;
 141
 142   /* The language-independent code should never use the
 143      DECL_ASSEMBLER_NAME for lots of DECLs.  Only FUNCTION_DECLs and
 144      VAR_DECLs for variables with static storage duration need a real
 145      DECL_ASSEMBLER_NAME.  */
 146   gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
 147               || (VAR_P (decl)
 148                   && (TREE_STATIC (decl)
 149                       || DECL_EXTERNAL (decl)
 150                       || TREE_PUBLIC (decl))));
 151
 152   /* By default, assume the name to use in assembly code is the same
 153      as that used in the source language.  (That's correct for C, and
 154      GCC used to set DECL_ASSEMBLER_NAME to the same value as
 155      DECL_NAME in build_decl, so this choice provides backwards
 156      compatibility with existing front-ends.  This assumption is wrapped
 157      in a target hook, to allow for target-specific modification of the
 158      identifier.
 159
 160      Can't use just the variable's own name for a variable whose scope
 161      is less than the whole compilation.  Concatenate a distinguishing
 162      number - we use the DECL_UID.  */
 163
 164   if (TREE_PUBLIC (decl) || DECL_FILE_SCOPE_P (decl))
 165     id = targetm.mangle_decl_assembler_name (decl, DECL_NAME (decl));
 166   else
 167     {
 168       const char *name = IDENTIFIER_POINTER (DECL_NAME (decl));
 169       char *label;
 170
 171       ASM_FORMAT_PRIVATE_NAME (label, name, DECL_UID (decl));
 172       id = get_identifier (label);
 173     }
 174
 175   SET_DECL_ASSEMBLER_NAME (decl, id);
 176 }
 177
 178 /* Forcibly overwrite the DECL_ASSEMBLER_NAME for DECL to NAME.  */
 179 void
 180 lhd_overwrite_decl_assembler_name (tree decl, tree name)
 181 {
 182   DECL_ASSEMBLER_NAME_RAW (decl) = name;
 183 }
 184
 185 /* Type promotion for variable arguments.  */
 186 tree
 187 lhd_type_promotes_to (tree ARG_UNUSED (type))
 188 {
 189   gcc_unreachable ();
 190 }
 191
 192 /* Registration of machine- or os-specific builtin types.  */
 193 void
 194 lhd_register_builtin_type (tree ARG_UNUSED (type),
 195                            const char * ARG_UNUSED (name))
 196 {
 197 }
 198
 199 /* Invalid use of an incomplete type.  */
 200 void
 201 lhd_incomplete_type_error (location_t ARG_UNUSED (loc),
 202                            const_tree ARG_UNUSED (value), const_tree type)
 203 {
 204   gcc_assert (TREE_CODE (type) == ERROR_MARK);
 205   return;
 206 }
 207
 208 /* Provide a default routine for alias sets that always returns -1.  This
 209    is used by languages that don't need to do anything special.  */
 210
 211 alias_set_type
 212 lhd_get_alias_set (tree ARG_UNUSED (t))
 213 {
 214   return -1;
 215 }
 216
 217 /* This is the default decl_printable_name function.  */
 218
 219 const char *
 220 lhd_decl_printable_name (tree decl, int ARG_UNUSED (verbosity))
 221 {
 222   gcc_assert (decl && DECL_NAME (decl));
 223   return IDENTIFIER_POINTER (DECL_NAME (decl));
 224 }
 225
 226 /* This is the default dwarf_name function.  */
 227
 228 const char *
 229 lhd_dwarf_name (tree t, int verbosity)
 230 {
 231   gcc_assert (DECL_P (t));
 232
 233   return lang_hooks.decl_printable_name (t, verbosity);
 234 }
 235
 236 /* This compares two types for equivalence ("compatible" in C-based languages).
 237    This routine should only return 1 if it is sure.  It should not be used
 238    in contexts where erroneously returning 0 causes problems.  */
 239
 240 int
 241 lhd_types_compatible_p (tree x, tree y)
 242 {
 243   return TYPE_MAIN_VARIANT (x) == TYPE_MAIN_VARIANT (y);
 244 }
 245
 246 /* lang_hooks.tree_dump.dump_tree:  Dump language-specific parts of tree
 247    nodes.  Returns nonzero if it does not want the usual dumping of the
 248    second argument.  */
 249
 250 bool
 251 lhd_tree_dump_dump_tree (void *di ATTRIBUTE_UNUSED, tree t ATTRIBUTE_UNUSED)
 252 {
 253   return false;
 254 }
 255
 256 /* lang_hooks.tree_dump.type_qual:  Determine type qualifiers in a
 257    language-specific way.  */
 258
 259 int
 260 lhd_tree_dump_type_quals (const_tree t)
 261 {
 262   return TYPE_QUALS (t);
 263 }
 264
 265 /* lang_hooks.gimplify_expr re-writes *EXPR_P into GIMPLE form.  */
 266
 267 int
 268 lhd_gimplify_expr (tree *expr_p ATTRIBUTE_UNUSED,
 269                    gimple_seq *pre_p ATTRIBUTE_UNUSED,
 270                    gimple_seq *post_p ATTRIBUTE_UNUSED)
 271 {
 272   return GS_UNHANDLED;
 273 }
 274
 275 /* lang_hooks.tree_size: Determine the size of a tree with code C,
 276    which is a language-specific tree code in category tcc_constant,
 277    tcc_exceptional or tcc_type.  The default expects never to be called.  */
 278 size_t
 279 lhd_tree_size (enum tree_code c ATTRIBUTE_UNUSED)
 280 {
 281   gcc_unreachable ();
 282 }
 283
 284 /* Return true if decl, which is a function decl, may be called by a
 285    sibcall.  */
 286
 287 bool
 288 lhd_decl_ok_for_sibcall (const_tree decl ATTRIBUTE_UNUSED)
 289 {
 290   return true;
 291 }
 292
 293 /* Generic global declaration processing.  This is meant to be called
 294    by the front-ends at the end of parsing.  C/C++ do their own thing,
 295    but other front-ends may call this.  */
 296
 297 void
 298 global_decl_processing (void)
 299 {
 300   tree globals, decl, *vec;
 301   int len, i;
 302
 303   timevar_stop (TV_PHASE_PARSING);
 304   timevar_start (TV_PHASE_DEFERRED);
 305   /* Really define vars that have had only a tentative definition.
 306      Really output inline functions that must actually be callable
 307      and have not been output so far.  */
 308
 309   globals = lang_hooks.decls.getdecls ();
 310   len = list_length (globals);
 311   vec = XNEWVEC (tree, len);
 312
 313   /* Process the decls in reverse order--earliest first.
 314      Put them into VEC from back to front, then take out from front.  */
 315
 316   for (i = 0, decl = globals; i < len; i++, decl = DECL_CHAIN (decl))
 317     vec[len - i - 1] = decl;
 318
 319   wrapup_global_declarations (vec, len);
 320   timevar_stop (TV_PHASE_DEFERRED);
 321
 322   timevar_start (TV_PHASE_PARSING);
 323   free (vec);
 324 }
 325
 326 /* Called to perform language-specific initialization of CTX.  */
 327 void
 328 lhd_initialize_diagnostics (diagnostic_context *ctx ATTRIBUTE_UNUSED)
 329 {
 330 }
 331
 332 /* Called to register dumps.  */
 333 void
 334 lhd_register_dumps (gcc::dump_manager *)
 335 {
 336 }
 337
 338 /* Called to perform language-specific options initialization.  */
 339 void
 340 lhd_init_options (unsigned int decoded_options_count ATTRIBUTE_UNUSED,
 341                   struct cl_decoded_option *decoded_options ATTRIBUTE_UNUSED)
 342 {
 343 }
 344
 345 /* By default, always complain about options for the wrong language.  */
 346 bool
 347 lhd_complain_wrong_lang_p (const struct cl_option *option ATTRIBUTE_UNUSED)
 348 {
 349   return true;
 350 }
 351
 352 /* By default, no language-specific options are valid.  */
 353 bool
 354 lhd_handle_option (size_t code ATTRIBUTE_UNUSED,
 355                    const char *arg ATTRIBUTE_UNUSED,
 356                    HOST_WIDE_INT value ATTRIBUTE_UNUSED,
 357                    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       char *old_prefix = pp_take_prefix (context->printer);
 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 /* Default implementation of LANG_HOOKS_TYPE_FOR_SIZE.
 487    Return an integer type with PRECISION bits of precision,
 488    that is unsigned if UNSIGNEDP is nonzero, otherwise signed.  */
 489
 490 tree
 491 lhd_type_for_size (unsigned precision, int unsignedp)
 492 {
 493   int i;
 494
 495   if (precision == TYPE_PRECISION (integer_type_node))
 496     return unsignedp ? unsigned_type_node : integer_type_node;
 497
 498   if (precision == TYPE_PRECISION (signed_char_type_node))
 499     return unsignedp ? unsigned_char_type_node : signed_char_type_node;
 500
 501   if (precision == TYPE_PRECISION (short_integer_type_node))
 502     return unsignedp ? short_unsigned_type_node : short_integer_type_node;
 503
 504   if (precision == TYPE_PRECISION (long_integer_type_node))
 505     return unsignedp ? long_unsigned_type_node : long_integer_type_node;
 506
 507   if (precision == TYPE_PRECISION (long_long_integer_type_node))
 508     return unsignedp
 509            ? long_long_unsigned_type_node
 510            : long_long_integer_type_node;
 511
 512   for (i = 0; i < NUM_INT_N_ENTS; i ++)
 513     if (int_n_enabled_p[i]
 514         && precision == int_n_data[i].bitsize)
 515       return (unsignedp ? int_n_trees[i].unsigned_type
 516               : int_n_trees[i].signed_type);
 517
 518   if (precision <= TYPE_PRECISION (intQI_type_node))
 519     return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
 520
 521   if (precision <= TYPE_PRECISION (intHI_type_node))
 522     return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
 523
 524   if (precision <= TYPE_PRECISION (intSI_type_node))
 525     return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
 526
 527   if (precision <= TYPE_PRECISION (intDI_type_node))
 528     return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
 529
 530   if (precision <= TYPE_PRECISION (intTI_type_node))
 531     return unsignedp ? unsigned_intTI_type_node : intTI_type_node;
 532
 533   return NULL_TREE;
 534 }
 535
 536 HOST_WIDE_INT
 537 lhd_to_target_charset (HOST_WIDE_INT c)
 538 {
 539   return c;
 540 }
 541
 542 tree
 543 lhd_expr_to_decl (tree expr, bool *tc ATTRIBUTE_UNUSED, bool *se ATTRIBUTE_UNUSED)
 544 {
 545   return expr;
 546 }
 547
 548 /* Return sharing kind if OpenMP sharing attribute of DECL is
 549    predetermined, OMP_CLAUSE_DEFAULT_UNSPECIFIED otherwise.  */
 550
 551 enum omp_clause_default_kind
 552 lhd_omp_predetermined_sharing (tree decl ATTRIBUTE_UNUSED)
 553 {
 554   if (DECL_ARTIFICIAL (decl))
 555     return OMP_CLAUSE_DEFAULT_SHARED;
 556   return OMP_CLAUSE_DEFAULT_UNSPECIFIED;
 557 }
 558
 559 /* Generate code to copy SRC to DST.  */
 560
 561 tree
 562 lhd_omp_assignment (tree clause ATTRIBUTE_UNUSED, tree dst, tree src)
 563 {
 564   return build2 (MODIFY_EXPR, TREE_TYPE (dst), dst, src);
 565 }
 566
 567 /* Finalize clause C.  */
 568
 569 void
 570 lhd_omp_finish_clause (tree, gimple_seq *)
 571 {
 572 }
 573
 574 /* Return true if DECL is a scalar variable (for the purpose of
 575    implicit firstprivatization).  */
 576
 577 bool
 578 lhd_omp_scalar_p (tree decl)
 579 {
 580   tree type = TREE_TYPE (decl);
 581   if (TREE_CODE (type) == REFERENCE_TYPE)
 582     type = TREE_TYPE (type);
 583   if (TREE_CODE (type) == COMPLEX_TYPE)
 584     type = TREE_TYPE (type);
 585   if (INTEGRAL_TYPE_P (type)
 586       || SCALAR_FLOAT_TYPE_P (type)
 587       || TREE_CODE (type) == POINTER_TYPE)
 588     return true;
 589   return false;
 590 }
 591
 592 /* Register language specific type size variables as potentially OpenMP
 593    firstprivate variables.  */
 594
 595 void
 596 lhd_omp_firstprivatize_type_sizes (struct gimplify_omp_ctx *c ATTRIBUTE_UNUSED,
 597                                    tree t ATTRIBUTE_UNUSED)
 598 {
 599 }
 600
 601 /* Return true if TYPE is an OpenMP mappable type.  */
 602
 603 bool
 604 lhd_omp_mappable_type (tree type)
 605 {
 606   /* Mappable type has to be complete.  */
 607   if (type == error_mark_node || !COMPLETE_TYPE_P (type))
 608     return false;
 609   return true;
 610 }
 611
 612 /* Common function for add_builtin_function and
 613    add_builtin_function_ext_scope.  */
 614 static tree
 615 add_builtin_function_common (const char *name,
 616                              tree type,
 617                              int function_code,
 618                              enum built_in_class cl,
 619                              const char *library_name,
 620                              tree attrs,
 621                              tree (*hook) (tree))
 622 {
 623   tree   id = get_identifier (name);
 624   tree decl = build_decl (BUILTINS_LOCATION, FUNCTION_DECL, id, type);
 625
 626   TREE_PUBLIC (decl)         = 1;
 627   DECL_EXTERNAL (decl)       = 1;
 628   DECL_BUILT_IN_CLASS (decl) = cl;
 629
 630   DECL_FUNCTION_CODE (decl)  = (enum built_in_function) function_code;
 631
 632   /* DECL_FUNCTION_CODE is a bitfield; verify that the value fits.  */
 633   gcc_assert (DECL_FUNCTION_CODE (decl) == function_code);
 634
 635   if (library_name)
 636     {
 637       tree libname = get_identifier (library_name);
 638
 639       libname = targetm.mangle_decl_assembler_name (decl, libname);
 640       SET_DECL_ASSEMBLER_NAME (decl, libname);
 641     }
 642
 643   /* Possibly apply some default attributes to this built-in function.  */
 644   if (attrs)
 645     decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
 646   else
 647     decl_attributes (&decl, NULL_TREE, 0);
 648
 649   return hook (decl);
 650
 651 }
 652
 653 /* Create a builtin function.  */
 654
 655 tree
 656 add_builtin_function (const char *name,
 657                       tree type,
 658                       int function_code,
 659                       enum built_in_class cl,
 660                       const char *library_name,
 661                       tree attrs)
 662 {
 663   return add_builtin_function_common (name, type, function_code, cl,
 664                                       library_name, attrs,
 665                                       lang_hooks.builtin_function);
 666 }
 667
 668 /* Like add_builtin_function, but make sure the scope is the external scope.
 669    This is used to delay putting in back end builtin functions until the ISA
 670    that defines the builtin is declared via function specific target options,
 671    which can save memory for machines like the x86_64 that have multiple ISAs.
 672    If this points to the same function as builtin_function, the backend must
 673    add all of the builtins at program initialization time.  */
 674
 675 tree
 676 add_builtin_function_ext_scope (const char *name,
 677                                 tree type,
 678                                 int function_code,
 679                                 enum built_in_class cl,
 680                                 const char *library_name,
 681                                 tree attrs)
 682 {
 683   return add_builtin_function_common (name, type, function_code, cl,
 684                                       library_name, attrs,
 685                                       lang_hooks.builtin_function_ext_scope);
 686 }
 687
 688 tree
 689 lhd_builtin_function (tree decl)
 690 {
 691   lang_hooks.decls.pushdecl (decl);
 692   return decl;
 693 }
 694
 695 /* Create a builtin type.  */
 696
 697 tree
 698 add_builtin_type (const char *name, tree type)
 699 {
 700   tree   id = get_identifier (name);
 701   tree decl = build_decl (BUILTINS_LOCATION, TYPE_DECL, id, type);
 702   return lang_hooks.decls.pushdecl (decl);
 703 }
 704
 705 /* LTO hooks.  */
 706
 707 /* Used to save and restore any previously active section.  */
 708 static section *saved_section;
 709
 710
 711 /* Begin a new LTO output section named NAME.  This default implementation
 712    saves the old section and emits assembly code to switch to the new
 713    section.  */
 714
 715 void
 716 lhd_begin_section (const char *name)
 717 {
 718   section *section;
 719
 720   /* Save the old section so we can restore it in lto_end_asm_section.  */
 721   gcc_assert (!saved_section);
 722   saved_section = in_section;
 723   if (!saved_section)
 724     saved_section = text_section;
 725
 726   /* Create a new section and switch to it.  */
 727   section = get_section (name, SECTION_DEBUG | SECTION_EXCLUDE, NULL);
 728   switch_to_section (section);
 729 }
 730
 731
 732 /* Write DATA of length LEN to the current LTO output section.  This default
 733    implementation just calls assemble_string.  */
 734
 735 void
 736 lhd_append_data (const void *data, size_t len, void *)
 737 {
 738   if (data)
 739     {
 740       timevar_push (TV_IPA_LTO_OUTPUT);
 741       assemble_string ((const char *)data, len);
 742       timevar_pop (TV_IPA_LTO_OUTPUT);
 743     }
 744 }
 745
 746
 747 /* Finish the current LTO output section.  This default implementation emits
 748    assembly code to switch to any section previously saved by
 749    lhd_begin_section.  */
 750
 751 void
 752 lhd_end_section (void)
 753 {
 754   if (saved_section)
 755     {
 756       switch_to_section (saved_section);
 757       saved_section = NULL;
 758     }
 759 }
 760
 761 /* Default implementation of enum_underlying_base_type using type_for_size.  */
 762
 763 tree
 764 lhd_enum_underlying_base_type (const_tree enum_type)
 765 {
 766   return lang_hooks.types.type_for_size (TYPE_PRECISION (enum_type),
 767                                          TYPE_UNSIGNED (enum_type));
 768 }
 769
 770 /* Default implementation of LANG_HOOKS_GET_SUBSTRING_LOCATION.  */
 771
 772 const char *
 773 lhd_get_substring_location (const substring_loc &, location_t *)
 774 {
 775   return "unimplemented";
 776 }
 777
 778 /* Default implementation of LANG_HOOKS_DECL_DWARF_ATTRIBUTE.  Don't add
 779    any attributes.  */
 780
 781 int
 782 lhd_decl_dwarf_attribute (const_tree, int)
 783 {
 784   return -1;
 785 }
 786
 787 /* Default implementation of LANG_HOOKS_TYPE_DWARF_ATTRIBUTE.  Don't add
 788    any attributes.  */
 789
 790 int
 791 lhd_type_dwarf_attribute (const_tree, int)
 792 {
 793   return -1;
 794 }
 795
 796 /* Default implementation of LANG_HOOKS_UNIT_SIZE_WITHOUT_REUSABLE_PADDING.
 797    Just return TYPE_SIZE_UNIT unadjusted.  */
 798
 799 tree
 800 lhd_unit_size_without_reusable_padding (tree t)
 801 {
 802   return TYPE_SIZE_UNIT (t);
 803 }
 804
 805 /* Returns true if the current lang_hooks represents the GNU C frontend.  */
 806
 807 bool
 808 lang_GNU_C (void)
 809 {
 810   return (strncmp (lang_hooks.name, "GNU C", 5) == 0
 811           && (lang_hooks.name[5] == '\0' || ISDIGIT (lang_hooks.name[5])));
 812 }
 813
 814 /* Returns true if the current lang_hooks represents the GNU C++ frontend.  */
 815
 816 bool
 817 lang_GNU_CXX (void)
 818 {
 819   return strncmp (lang_hooks.name, "GNU C++", 7) == 0;
 820 }
 821
 822 /* Returns true if the current lang_hooks represents the GNU Fortran frontend.  */
 823
 824 bool
 825 lang_GNU_Fortran (void)
 826 {
 827   return strncmp (lang_hooks.name, "GNU Fortran", 11) == 0;
 828 }
 829
 830 /* Returns true if the current lang_hooks represents the GNU Objective-C
 831    frontend.  */
 832
 833 bool
 834 lang_GNU_OBJC (void)
 835 {
 836   return strncmp (lang_hooks.name, "GNU Objective-C", 15) == 0;
 837 }