1/* Default language-specific hooks.
2 Copyright (C) 2001-2017 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 3, 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 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
41void
42lhd_do_nothing (void)
43{
44}
45
46/* Do nothing (tree). */
47
48void
49lhd_do_nothing_t (tree ARG_UNUSED (t))
50{
51}
52
53/* Pass through (tree). */
54tree
55lhd_pass_through_t (tree t)
56{
57 return t;
58}
59
60/* Do nothing (int, int, int). Return NULL_TREE. */
61
62tree
63lhd_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
72void
73lhd_do_nothing_f (struct function * ARG_UNUSED (f))
74{
75}
76
77/* Do nothing (return NULL_TREE). */
78
79tree
80lhd_return_null_tree (tree ARG_UNUSED (t))
81{
82 return NULL_TREE;
83}
84
85/* Do nothing (return NULL_TREE). */
86
87tree
88lhd_return_null_const_tree (const_tree ARG_UNUSED (t))
89{
90 return NULL_TREE;
91}
92
93/* The default post options hook. */
94
95bool
96lhd_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
106void
107lhd_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
115bool
116lhd_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. */
132void
133lhd_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. */
179void
180lhd_overwrite_decl_assembler_name (tree decl, tree name)
181{
182 DECL_ASSEMBLER_NAME_RAW (decl) = name;
183}
184
185/* Type promotion for variable arguments. */
186tree
187lhd_type_promotes_to (tree ARG_UNUSED (type))
188{
189 gcc_unreachable ();
190}
191
192/* Registration of machine- or os-specific builtin types. */
193void
194lhd_register_builtin_type (tree ARG_UNUSED (type),
195 const char * ARG_UNUSED (name))
196{
197}
198
199/* Invalid use of an incomplete type. */
200void
201lhd_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
211alias_set_type
212lhd_get_alias_set (tree ARG_UNUSED (t))
213{
214 return -1;
215}
216
217/* This is the default decl_printable_name function. */
218
219const char *
220lhd_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
228const char *
229lhd_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
240int
241lhd_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
250bool
251lhd_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
259int
260lhd_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
267int
268lhd_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. */
278size_t
279lhd_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
287bool
288lhd_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
297void
298global_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. */
327void
328lhd_initialize_diagnostics (diagnostic_context *ctx ATTRIBUTE_UNUSED)
329{
330}
331
332/* Called to register dumps. */
333void
334lhd_register_dumps (gcc::dump_manager *)
335{
336}
337
338/* Called to perform language-specific options initialization. */
339void
340lhd_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. */
346bool
347lhd_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. */
353bool
354lhd_handle_option (size_t code ATTRIBUTE_UNUSED,
355 const char *arg ATTRIBUTE_UNUSED,
356 int value ATTRIBUTE_UNUSED, int kind ATTRIBUTE_UNUSED,
357 location_t loc ATTRIBUTE_UNUSED,
358 const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
359{
360 return false;
361}
362
363/* The default function to print out name of current function that caused
364 an error. */
365void
366lhd_print_error_function (diagnostic_context *context, const char *file,
367 diagnostic_info *diagnostic)
368{
369 if (diagnostic_last_function_changed (context, diagnostic))
370 {
371 const char *old_prefix = context->printer->prefix;
372 tree abstract_origin = diagnostic_abstract_origin (diagnostic);
373 char *new_prefix = (file && abstract_origin == NULL)
374 ? file_name_as_prefix (context, file) : NULL;
375
376 pp_set_prefix (context->printer, new_prefix);
377
378 if (current_function_decl == NULL)
379 pp_printf (context->printer, _("At top level:"));
380 else
381 {
382 tree fndecl, ao;
383
384 if (abstract_origin)
385 {
386 ao = BLOCK_ABSTRACT_ORIGIN (abstract_origin);
387 while (TREE_CODE (ao) == BLOCK
388 && BLOCK_ABSTRACT_ORIGIN (ao)
389 && BLOCK_ABSTRACT_ORIGIN (ao) != ao)
390 ao = BLOCK_ABSTRACT_ORIGIN (ao);
391 gcc_assert (TREE_CODE (ao) == FUNCTION_DECL);
392 fndecl = ao;
393 }
394 else
395 fndecl = current_function_decl;
396
397 if (TREE_CODE (TREE_TYPE (fndecl)) == METHOD_TYPE)
398 pp_printf
399 (context->printer, _("In member function %qs"),
400 identifier_to_locale (lang_hooks.decl_printable_name (fndecl, 2)));
401 else
402 pp_printf
403 (context->printer, _("In function %qs"),
404 identifier_to_locale (lang_hooks.decl_printable_name (fndecl, 2)));
405
406 while (abstract_origin)
407 {
408 location_t *locus;
409 tree block = abstract_origin;
410
411 locus = &BLOCK_SOURCE_LOCATION (block);
412 fndecl = NULL;
413 block = BLOCK_SUPERCONTEXT (block);
414 while (block && TREE_CODE (block) == BLOCK
415 && BLOCK_ABSTRACT_ORIGIN (block))
416 {
417 ao = BLOCK_ABSTRACT_ORIGIN (block);
418
419 while (TREE_CODE (ao) == BLOCK
420 && BLOCK_ABSTRACT_ORIGIN (ao)
421 && BLOCK_ABSTRACT_ORIGIN (ao) != ao)
422 ao = BLOCK_ABSTRACT_ORIGIN (ao);
423
424 if (TREE_CODE (ao) == FUNCTION_DECL)
425 {
426 fndecl = ao;
427 break;
428 }
429 else if (TREE_CODE (ao) != BLOCK)
430 break;
431
432 block = BLOCK_SUPERCONTEXT (block);
433 }
434 if (fndecl)
435 abstract_origin = block;
436 else
437 {
438 while (block && TREE_CODE (block) == BLOCK)
439 block = BLOCK_SUPERCONTEXT (block);
440
441 if (block && TREE_CODE (block) == FUNCTION_DECL)
442 fndecl = block;
443 abstract_origin = NULL;
444 }
445 if (fndecl)
446 {
447 expanded_location s = expand_location (*locus);
448 pp_comma (context->printer);
449 pp_newline (context->printer);
450 if (s.file != NULL)
451 {
452 if (context->show_column)
453 pp_printf (context->printer,
454 _(" inlined from %qs at %r%s:%d:%d%R"),
455 identifier_to_locale (lang_hooks.decl_printable_name (fndecl, 2)),
456 "locus", s.file, s.line, s.column);
457 else
458 pp_printf (context->printer,
459 _(" inlined from %qs at %r%s:%d%R"),
460 identifier_to_locale (lang_hooks.decl_printable_name (fndecl, 2)),
461 "locus", s.file, s.line);
462
463 }
464 else
465 pp_printf (context->printer, _(" inlined from %qs"),
466 identifier_to_locale (lang_hooks.decl_printable_name (fndecl, 2)));
467 }
468 }
469 pp_colon (context->printer);
470 }
471
472 diagnostic_set_last_function (context, diagnostic);
473 pp_newline_and_flush (context->printer);
474 context->printer->prefix = old_prefix;
475 free ((char*) new_prefix);
476 }
477}
478
479tree
480lhd_make_node (enum tree_code code)
481{
482 return make_node (code);
483}
484
485/* Default implementation of LANG_HOOKS_TYPE_FOR_SIZE.
486 Return an integer type with PRECISION bits of precision,
487 that is unsigned if UNSIGNEDP is nonzero, otherwise signed. */
488
489tree
490lhd_type_for_size (unsigned precision, int unsignedp)
491{
492 int i;
493
494 if (precision == TYPE_PRECISION (integer_type_node))
495 return unsignedp ? unsigned_type_node : integer_type_node;
496
497 if (precision == TYPE_PRECISION (signed_char_type_node))
498 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
499
500 if (precision == TYPE_PRECISION (short_integer_type_node))
501 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
502
503 if (precision == TYPE_PRECISION (long_integer_type_node))
504 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
505
506 if (precision == TYPE_PRECISION (long_long_integer_type_node))
507 return unsignedp
508 ? long_long_unsigned_type_node
509 : long_long_integer_type_node;
510
511 for (i = 0; i < NUM_INT_N_ENTS; i ++)
512 if (int_n_enabled_p[i]
513 && precision == int_n_data[i].bitsize)
514 return (unsignedp ? int_n_trees[i].unsigned_type
515 : int_n_trees[i].signed_type);
516
517 if (precision <= TYPE_PRECISION (intQI_type_node))
518 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
519
520 if (precision <= TYPE_PRECISION (intHI_type_node))
521 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
522
523 if (precision <= TYPE_PRECISION (intSI_type_node))
524 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
525
526 if (precision <= TYPE_PRECISION (intDI_type_node))
527 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
528
529 if (precision <= TYPE_PRECISION (intTI_type_node))
530 return unsignedp ? unsigned_intTI_type_node : intTI_type_node;
531
532 return NULL_TREE;
533}
534
535HOST_WIDE_INT
536lhd_to_target_charset (HOST_WIDE_INT c)
537{
538 return c;
539}
540
541tree
542lhd_expr_to_decl (tree expr, bool *tc ATTRIBUTE_UNUSED, bool *se ATTRIBUTE_UNUSED)
543{
544 return expr;
545}
546
547/* Return sharing kind if OpenMP sharing attribute of DECL is
548 predetermined, OMP_CLAUSE_DEFAULT_UNSPECIFIED otherwise. */
549
550enum omp_clause_default_kind
551lhd_omp_predetermined_sharing (tree decl ATTRIBUTE_UNUSED)
552{
553 if (DECL_ARTIFICIAL (decl))
554 return OMP_CLAUSE_DEFAULT_SHARED;
555 return OMP_CLAUSE_DEFAULT_UNSPECIFIED;
556}
557
558/* Generate code to copy SRC to DST. */
559
560tree
561lhd_omp_assignment (tree clause ATTRIBUTE_UNUSED, tree dst, tree src)
562{
563 return build2 (MODIFY_EXPR, TREE_TYPE (dst), dst, src);
564}
565
566/* Finalize clause C. */
567
568void
569lhd_omp_finish_clause (tree, gimple_seq *)
570{
571}
572
573/* Return true if DECL is a scalar variable (for the purpose of
574 implicit firstprivatization). */
575
576bool
577lhd_omp_scalar_p (tree decl)
578{
579 tree type = TREE_TYPE (decl);
580 if (TREE_CODE (type) == REFERENCE_TYPE)
581 type = TREE_TYPE (type);
582 if (TREE_CODE (type) == COMPLEX_TYPE)
583 type = TREE_TYPE (type);
584 if (INTEGRAL_TYPE_P (type)
585 || SCALAR_FLOAT_TYPE_P (type)
586 || TREE_CODE (type) == POINTER_TYPE)
587 return true;
588 return false;
589}
590
591/* Register language specific type size variables as potentially OpenMP
592 firstprivate variables. */
593
594void
595lhd_omp_firstprivatize_type_sizes (struct gimplify_omp_ctx *c ATTRIBUTE_UNUSED,
596 tree t ATTRIBUTE_UNUSED)
597{
598}
599
600/* Return true if TYPE is an OpenMP mappable type. */
601
602bool
603lhd_omp_mappable_type (tree type)
604{
605 /* Mappable type has to be complete. */
606 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
607 return false;
608 return true;
609}
610
611/* Common function for add_builtin_function and
612 add_builtin_function_ext_scope. */
613static tree
614add_builtin_function_common (const char *name,
615 tree type,
616 int function_code,
617 enum built_in_class cl,
618 const char *library_name,
619 tree attrs,
620 tree (*hook) (tree))
621{
622 tree id = get_identifier (name);
623 tree decl = build_decl (BUILTINS_LOCATION, FUNCTION_DECL, id, type);
624
625 TREE_PUBLIC (decl) = 1;
626 DECL_EXTERNAL (decl) = 1;
627 DECL_BUILT_IN_CLASS (decl) = cl;
628
629 DECL_FUNCTION_CODE (decl) = (enum built_in_function) function_code;
630
631 /* DECL_FUNCTION_CODE is a bitfield; verify that the value fits. */
632 gcc_assert (DECL_FUNCTION_CODE (decl) == function_code);
633
634 if (library_name)
635 {
636 tree libname = get_identifier (library_name);
637
638 libname = targetm.mangle_decl_assembler_name (decl, libname);
639 SET_DECL_ASSEMBLER_NAME (decl, libname);
640 }
641
642 /* Possibly apply some default attributes to this built-in function. */
643 if (attrs)
644 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
645 else
646 decl_attributes (&decl, NULL_TREE, 0);
647
648 return hook (decl);
649
650}
651
652/* Create a builtin function. */
653
654tree
655add_builtin_function (const char *name,
656 tree type,
657 int function_code,
658 enum built_in_class cl,
659 const char *library_name,
660 tree attrs)
661{
662 return add_builtin_function_common (name, type, function_code, cl,
663 library_name, attrs,
664 lang_hooks.builtin_function);
665}
666
667/* Like add_builtin_function, but make sure the scope is the external scope.
668 This is used to delay putting in back end builtin functions until the ISA
669 that defines the builtin is declared via function specific target options,
670 which can save memory for machines like the x86_64 that have multiple ISAs.
671 If this points to the same function as builtin_function, the backend must
672 add all of the builtins at program initialization time. */
673
674tree
675add_builtin_function_ext_scope (const char *name,
676 tree type,
677 int function_code,
678 enum built_in_class cl,
679 const char *library_name,
680 tree attrs)
681{
682 return add_builtin_function_common (name, type, function_code, cl,
683 library_name, attrs,
684 lang_hooks.builtin_function_ext_scope);
685}
686
687tree
688lhd_builtin_function (tree decl)
689{
690 lang_hooks.decls.pushdecl (decl);
691 return decl;
692}
693
694/* Create a builtin type. */
695
696tree
697add_builtin_type (const char *name, tree type)
698{
699 tree id = get_identifier (name);
700 tree decl = build_decl (BUILTINS_LOCATION, TYPE_DECL, id, type);
701 return lang_hooks.decls.pushdecl (decl);
702}
703
704/* LTO hooks. */
705
706/* Used to save and restore any previously active section. */
707static section *saved_section;
708
709
710/* Begin a new LTO output section named NAME. This default implementation
711 saves the old section and emits assembly code to switch to the new
712 section. */
713
714void
715lhd_begin_section (const char *name)
716{
717 section *section;
718
719 /* Save the old section so we can restore it in lto_end_asm_section. */
720 gcc_assert (!saved_section);
721 saved_section = in_section;
722 if (!saved_section)
723 saved_section = text_section;
724
725 /* Create a new section and switch to it. */
726 section = get_section (name, SECTION_DEBUG | SECTION_EXCLUDE, NULL);
727 switch_to_section (section);
728}
729
730
731/* Write DATA of length LEN to the current LTO output section. This default
732 implementation just calls assemble_string. */
733
734void
735lhd_append_data (const void *data, size_t len, void *)
736{
737 if (data)
738 {
739 timevar_push (TV_IPA_LTO_OUTPUT);
740 assemble_string ((const char *)data, len);
741 timevar_pop (TV_IPA_LTO_OUTPUT);
742 }
743}
744
745
746/* Finish the current LTO output section. This default implementation emits
747 assembly code to switch to any section previously saved by
748 lhd_begin_section. */
749
750void
751lhd_end_section (void)
752{
753 if (saved_section)
754 {
755 switch_to_section (saved_section);
756 saved_section = NULL;
757 }
758}
759
760/* Default implementation of enum_underlying_base_type using type_for_size. */
761
762tree
763lhd_enum_underlying_base_type (const_tree enum_type)
764{
765 return lang_hooks.types.type_for_size (TYPE_PRECISION (enum_type),
766 TYPE_UNSIGNED (enum_type));
767}
768
769/* Default implementation of LANG_HOOKS_GET_SUBSTRING_LOCATION. */
770
771const char *
772lhd_get_substring_location (const substring_loc &, location_t *)
773{
774 return "unimplemented";
775}
776
777/* Default implementation of LANG_HOOKS_DECL_DWARF_ATTRIBUTE. Don't add
778 any attributes. */
779
780int
781lhd_decl_dwarf_attribute (const_tree, int)
782{
783 return -1;
784}
785
786/* Default implementation of LANG_HOOKS_TYPE_DWARF_ATTRIBUTE. Don't add
787 any attributes. */
788
789int
790lhd_type_dwarf_attribute (const_tree, int)
791{
792 return -1;
793}
794
795/* Default implementation of LANG_HOOKS_UNIT_SIZE_WITHOUT_REUSABLE_PADDING.
796 Just return TYPE_SIZE_UNIT unadjusted. */
797
798tree
799lhd_unit_size_without_reusable_padding (tree t)
800{
801 return TYPE_SIZE_UNIT (t);
802}
803
804/* Returns true if the current lang_hooks represents the GNU C frontend. */
805
806bool
807lang_GNU_C (void)
808{
809 return (strncmp (lang_hooks.name, "GNU C", 5) == 0
810 && (lang_hooks.name[5] == '\0' || ISDIGIT (lang_hooks.name[5])));
811}
812
813/* Returns true if the current lang_hooks represents the GNU C++ frontend. */
814
815bool
816lang_GNU_CXX (void)
817{
818 return strncmp (lang_hooks.name, "GNU C++", 7) == 0;
819}
820
821/* Returns true if the current lang_hooks represents the GNU Fortran frontend. */
822
823bool
824lang_GNU_Fortran (void)
825{
826 return strncmp (lang_hooks.name, "GNU Fortran", 11) == 0;
827}
828
829/* Returns true if the current lang_hooks represents the GNU Objective-C
830 frontend. */
831
832bool
833lang_GNU_OBJC (void)
834{
835 return strncmp (lang_hooks.name, "GNU Objective-C", 15) == 0;
836}
837