1 /* Default language-specific hooks.
2 Copyright (C) 2001-2015 Free Software Foundation, Inc.
3 Contributed by Alexandre Oliva <aoliva@redhat.com>
5 This file is part of GCC.
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)
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.
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/>. */
23 #include "coretypes.h"
29 #include "stringpool.h"
30 #include "insn-config.h"
32 #include "diagnostic.h"
37 #include "tree-inline.h"
40 #include "langhooks.h"
41 #include "langhooks-def.h"
42 #include "tree-diagnostic.h"
45 /* Do nothing; in many cases the default hook. */
52 /* Do nothing (tree). */
55 lhd_do_nothing_t (tree
ARG_UNUSED (t
))
59 /* Pass through (tree). */
61 lhd_pass_through_t (tree t
)
66 /* Do nothing (int, int, int). Return NULL_TREE. */
69 lhd_do_nothing_iii_return_null_tree (int ARG_UNUSED (i
),
76 /* Do nothing (function). */
79 lhd_do_nothing_f (struct function
* ARG_UNUSED (f
))
83 /* Do nothing (return NULL_TREE). */
86 lhd_return_null_tree_v (void)
91 /* Do nothing (return NULL_TREE). */
94 lhd_return_null_tree (tree
ARG_UNUSED (t
))
99 /* Do nothing (return NULL_TREE). */
102 lhd_return_null_const_tree (const_tree
ARG_UNUSED (t
))
107 /* The default post options hook. */
110 lhd_post_options (const char ** ARG_UNUSED (pfilename
))
112 /* Excess precision other than "fast" requires front-end
114 flag_excess_precision_cmdline
= EXCESS_PRECISION_FAST
;
118 /* Called from by print-tree.c. */
121 lhd_print_tree_nothing (FILE * ARG_UNUSED (file
),
122 tree
ARG_UNUSED (node
),
123 int ARG_UNUSED (indent
))
127 /* Called from check_global_declaration. */
130 lhd_warn_unused_global_decl (const_tree decl
)
132 /* This is what used to exist in check_global_declaration. Probably
133 not many of these actually apply to non-C languages. */
135 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_DECLARED_INLINE_P (decl
))
137 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_READONLY (decl
))
139 if (DECL_IN_SYSTEM_HEADER (decl
))
145 /* Set the DECL_ASSEMBLER_NAME for DECL. */
147 lhd_set_decl_assembler_name (tree decl
)
151 /* set_decl_assembler_name may be called on TYPE_DECL to record ODR
152 name for C++ types. By default types have no ODR names. */
153 if (TREE_CODE (decl
) == TYPE_DECL
)
156 /* The language-independent code should never use the
157 DECL_ASSEMBLER_NAME for lots of DECLs. Only FUNCTION_DECLs and
158 VAR_DECLs for variables with static storage duration need a real
159 DECL_ASSEMBLER_NAME. */
160 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
161 || (TREE_CODE (decl
) == VAR_DECL
162 && (TREE_STATIC (decl
)
163 || DECL_EXTERNAL (decl
)
164 || TREE_PUBLIC (decl
))));
166 /* By default, assume the name to use in assembly code is the same
167 as that used in the source language. (That's correct for C, and
168 GCC used to set DECL_ASSEMBLER_NAME to the same value as
169 DECL_NAME in build_decl, so this choice provides backwards
170 compatibility with existing front-ends. This assumption is wrapped
171 in a target hook, to allow for target-specific modification of the
174 Can't use just the variable's own name for a variable whose scope
175 is less than the whole compilation. Concatenate a distinguishing
176 number - we use the DECL_UID. */
178 if (TREE_PUBLIC (decl
) || DECL_FILE_SCOPE_P (decl
))
179 id
= targetm
.mangle_decl_assembler_name (decl
, DECL_NAME (decl
));
182 const char *name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
185 ASM_FORMAT_PRIVATE_NAME (label
, name
, DECL_UID (decl
));
186 id
= get_identifier (label
);
188 SET_DECL_ASSEMBLER_NAME (decl
, id
);
192 /* Type promotion for variable arguments. */
194 lhd_type_promotes_to (tree
ARG_UNUSED (type
))
199 /* Registration of machine- or os-specific builtin types. */
201 lhd_register_builtin_type (tree
ARG_UNUSED (type
),
202 const char * ARG_UNUSED (name
))
206 /* Invalid use of an incomplete type. */
208 lhd_incomplete_type_error (const_tree
ARG_UNUSED (value
), const_tree type
)
210 gcc_assert (TREE_CODE (type
) == ERROR_MARK
);
214 /* Provide a default routine for alias sets that always returns -1. This
215 is used by languages that don't need to do anything special. */
218 lhd_get_alias_set (tree
ARG_UNUSED (t
))
223 /* This is the default decl_printable_name function. */
226 lhd_decl_printable_name (tree decl
, int ARG_UNUSED (verbosity
))
228 gcc_assert (decl
&& DECL_NAME (decl
));
229 return IDENTIFIER_POINTER (DECL_NAME (decl
));
232 /* This is the default dwarf_name function. */
235 lhd_dwarf_name (tree t
, int verbosity
)
237 gcc_assert (DECL_P (t
));
239 return lang_hooks
.decl_printable_name (t
, verbosity
);
242 /* This compares two types for equivalence ("compatible" in C-based languages).
243 This routine should only return 1 if it is sure. It should not be used
244 in contexts where erroneously returning 0 causes problems. */
247 lhd_types_compatible_p (tree x
, tree y
)
249 return TYPE_MAIN_VARIANT (x
) == TYPE_MAIN_VARIANT (y
);
252 /* lang_hooks.tree_dump.dump_tree: Dump language-specific parts of tree
253 nodes. Returns nonzero if it does not want the usual dumping of the
257 lhd_tree_dump_dump_tree (void *di ATTRIBUTE_UNUSED
, tree t ATTRIBUTE_UNUSED
)
262 /* lang_hooks.tree_dump.type_qual: Determine type qualifiers in a
263 language-specific way. */
266 lhd_tree_dump_type_quals (const_tree t
)
268 return TYPE_QUALS (t
);
271 /* lang_hooks.gimplify_expr re-writes *EXPR_P into GIMPLE form. */
274 lhd_gimplify_expr (tree
*expr_p ATTRIBUTE_UNUSED
,
275 gimple_seq
*pre_p ATTRIBUTE_UNUSED
,
276 gimple_seq
*post_p ATTRIBUTE_UNUSED
)
281 /* lang_hooks.tree_size: Determine the size of a tree with code C,
282 which is a language-specific tree code in category tcc_constant or
283 tcc_exceptional. The default expects never to be called. */
285 lhd_tree_size (enum tree_code c ATTRIBUTE_UNUSED
)
290 /* Return true if decl, which is a function decl, may be called by a
294 lhd_decl_ok_for_sibcall (const_tree decl ATTRIBUTE_UNUSED
)
299 /* Generic global declaration processing. This is meant to be called
300 by the front-ends at the end of parsing. C/C++ do their own thing,
301 but other front-ends may call this. */
304 global_decl_processing (void)
306 tree globals
, decl
, *vec
;
309 timevar_stop (TV_PHASE_PARSING
);
310 timevar_start (TV_PHASE_DEFERRED
);
311 /* Really define vars that have had only a tentative definition.
312 Really output inline functions that must actually be callable
313 and have not been output so far. */
315 globals
= lang_hooks
.decls
.getdecls ();
316 len
= list_length (globals
);
317 vec
= XNEWVEC (tree
, len
);
319 /* Process the decls in reverse order--earliest first.
320 Put them into VEC from back to front, then take out from front. */
322 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= DECL_CHAIN (decl
))
323 vec
[len
- i
- 1] = decl
;
325 wrapup_global_declarations (vec
, len
);
326 timevar_stop (TV_PHASE_DEFERRED
);
328 timevar_start (TV_PHASE_PARSING
);
332 /* Called to perform language-specific initialization of CTX. */
334 lhd_initialize_diagnostics (diagnostic_context
*ctx ATTRIBUTE_UNUSED
)
338 /* Called to perform language-specific options initialization. */
340 lhd_init_options (unsigned int decoded_options_count ATTRIBUTE_UNUSED
,
341 struct cl_decoded_option
*decoded_options ATTRIBUTE_UNUSED
)
345 /* By default, always complain about options for the wrong language. */
347 lhd_complain_wrong_lang_p (const struct cl_option
*option ATTRIBUTE_UNUSED
)
352 /* By default, no language-specific options are valid. */
354 lhd_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
)
363 /* The default function to print out name of current function that caused
366 lhd_print_error_function (diagnostic_context
*context
, const char *file
,
367 diagnostic_info
*diagnostic
)
369 if (diagnostic_last_function_changed (context
, diagnostic
))
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
;
376 pp_set_prefix (context
->printer
, new_prefix
);
378 if (current_function_decl
== NULL
)
379 pp_printf (context
->printer
, _("At top level:"));
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
);
395 fndecl
= current_function_decl
;
397 if (TREE_CODE (TREE_TYPE (fndecl
)) == METHOD_TYPE
)
399 (context
->printer
, _("In member function %qs"),
400 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)));
403 (context
->printer
, _("In function %qs"),
404 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)));
406 while (abstract_origin
)
409 tree block
= abstract_origin
;
411 locus
= &BLOCK_SOURCE_LOCATION (block
);
413 block
= BLOCK_SUPERCONTEXT (block
);
414 while (block
&& TREE_CODE (block
) == BLOCK
415 && BLOCK_ABSTRACT_ORIGIN (block
))
417 ao
= BLOCK_ABSTRACT_ORIGIN (block
);
419 while (TREE_CODE (ao
) == BLOCK
420 && BLOCK_ABSTRACT_ORIGIN (ao
)
421 && BLOCK_ABSTRACT_ORIGIN (ao
) != ao
)
422 ao
= BLOCK_ABSTRACT_ORIGIN (ao
);
424 if (TREE_CODE (ao
) == FUNCTION_DECL
)
429 else if (TREE_CODE (ao
) != BLOCK
)
432 block
= BLOCK_SUPERCONTEXT (block
);
435 abstract_origin
= block
;
438 while (block
&& TREE_CODE (block
) == BLOCK
)
439 block
= BLOCK_SUPERCONTEXT (block
);
441 if (block
&& TREE_CODE (block
) == FUNCTION_DECL
)
443 abstract_origin
= NULL
;
447 expanded_location s
= expand_location (*locus
);
448 pp_comma (context
->printer
);
449 pp_newline (context
->printer
);
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
);
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
);
465 pp_printf (context
->printer
, _(" inlined from %qs"),
466 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)));
469 pp_colon (context
->printer
);
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
);
480 lhd_make_node (enum tree_code code
)
482 return make_node (code
);
486 lhd_to_target_charset (HOST_WIDE_INT c
)
492 lhd_expr_to_decl (tree expr
, bool *tc ATTRIBUTE_UNUSED
, bool *se ATTRIBUTE_UNUSED
)
497 /* Return sharing kind if OpenMP sharing attribute of DECL is
498 predetermined, OMP_CLAUSE_DEFAULT_UNSPECIFIED otherwise. */
500 enum omp_clause_default_kind
501 lhd_omp_predetermined_sharing (tree decl ATTRIBUTE_UNUSED
)
503 if (DECL_ARTIFICIAL (decl
))
504 return OMP_CLAUSE_DEFAULT_SHARED
;
505 return OMP_CLAUSE_DEFAULT_UNSPECIFIED
;
508 /* Generate code to copy SRC to DST. */
511 lhd_omp_assignment (tree clause ATTRIBUTE_UNUSED
, tree dst
, tree src
)
513 return build2 (MODIFY_EXPR
, TREE_TYPE (dst
), dst
, src
);
516 /* Finalize clause C. */
519 lhd_omp_finish_clause (tree
, gimple_seq
*)
523 /* Register language specific type size variables as potentially OpenMP
524 firstprivate variables. */
527 lhd_omp_firstprivatize_type_sizes (struct gimplify_omp_ctx
*c ATTRIBUTE_UNUSED
,
528 tree t ATTRIBUTE_UNUSED
)
532 /* Return true if TYPE is an OpenMP mappable type. */
535 lhd_omp_mappable_type (tree type
)
537 /* Mappable type has to be complete. */
538 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
543 /* Common function for add_builtin_function and
544 add_builtin_function_ext_scope. */
546 add_builtin_function_common (const char *name
,
549 enum built_in_class cl
,
550 const char *library_name
,
554 tree id
= get_identifier (name
);
555 tree decl
= build_decl (BUILTINS_LOCATION
, FUNCTION_DECL
, id
, type
);
557 TREE_PUBLIC (decl
) = 1;
558 DECL_EXTERNAL (decl
) = 1;
559 DECL_BUILT_IN_CLASS (decl
) = cl
;
561 DECL_FUNCTION_CODE (decl
) = (enum built_in_function
) function_code
;
563 /* DECL_FUNCTION_CODE is a bitfield; verify that the value fits. */
564 gcc_assert (DECL_FUNCTION_CODE (decl
) == function_code
);
568 tree libname
= get_identifier (library_name
);
569 SET_DECL_ASSEMBLER_NAME (decl
, libname
);
572 /* Possibly apply some default attributes to this built-in function. */
574 decl_attributes (&decl
, attrs
, ATTR_FLAG_BUILT_IN
);
576 decl_attributes (&decl
, NULL_TREE
, 0);
582 /* Create a builtin function. */
585 add_builtin_function (const char *name
,
588 enum built_in_class cl
,
589 const char *library_name
,
592 return add_builtin_function_common (name
, type
, function_code
, cl
,
594 lang_hooks
.builtin_function
);
597 /* Like add_builtin_function, but make sure the scope is the external scope.
598 This is used to delay putting in back end builtin functions until the ISA
599 that defines the builtin is declared via function specific target options,
600 which can save memory for machines like the x86_64 that have multiple ISAs.
601 If this points to the same function as builtin_function, the backend must
602 add all of the builtins at program initialization time. */
605 add_builtin_function_ext_scope (const char *name
,
608 enum built_in_class cl
,
609 const char *library_name
,
612 return add_builtin_function_common (name
, type
, function_code
, cl
,
614 lang_hooks
.builtin_function_ext_scope
);
618 lhd_builtin_function (tree decl
)
620 lang_hooks
.decls
.pushdecl (decl
);
624 /* Create a builtin type. */
627 add_builtin_type (const char *name
, tree type
)
629 tree id
= get_identifier (name
);
630 tree decl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, id
, type
);
631 return lang_hooks
.decls
.pushdecl (decl
);
636 /* Used to save and restore any previously active section. */
637 static section
*saved_section
;
640 /* Begin a new LTO output section named NAME. This default implementation
641 saves the old section and emits assembly code to switch to the new
645 lhd_begin_section (const char *name
)
649 /* Save the old section so we can restore it in lto_end_asm_section. */
650 gcc_assert (!saved_section
);
651 saved_section
= in_section
;
653 saved_section
= text_section
;
655 /* Create a new section and switch to it. */
656 section
= get_section (name
, SECTION_DEBUG
| SECTION_EXCLUDE
, NULL
);
657 switch_to_section (section
);
661 /* Write DATA of length LEN to the current LTO output section. This default
662 implementation just calls assemble_string. */
665 lhd_append_data (const void *data
, size_t len
, void *)
668 assemble_string ((const char *)data
, len
);
672 /* Finish the current LTO output section. This default implementation emits
673 assembly code to switch to any section previously saved by
674 lhd_begin_section. */
677 lhd_end_section (void)
681 switch_to_section (saved_section
);
682 saved_section
= NULL
;
686 /* Default implementation of enum_underlying_base_type using type_for_size. */
689 lhd_enum_underlying_base_type (const_tree enum_type
)
691 return lang_hooks
.types
.type_for_size (TYPE_PRECISION (enum_type
),
692 TYPE_UNSIGNED (enum_type
));
695 /* Returns true if the current lang_hooks represents the GNU C frontend. */
700 return (strncmp (lang_hooks
.name
, "GNU C", 5) == 0
701 && (lang_hooks
.name
[5] == '\0' || ISDIGIT (lang_hooks
.name
[5])));
704 /* Returns true if the current lang_hooks represents the GNU C++ frontend. */
709 return strncmp (lang_hooks
.name
, "GNU C++", 7) == 0;
712 /* Returns true if the current lang_hooks represents the GNU Fortran frontend. */
715 lang_GNU_Fortran (void)
717 return strncmp (lang_hooks
.name
, "GNU Fortran", 11) == 0;