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"
34 #include "stringpool.h"
36 #include "tree-inline.h"
39 #include "insn-config.h"
41 #include "langhooks.h"
43 #include "langhooks-def.h"
44 #include "diagnostic.h"
45 #include "tree-diagnostic.h"
48 #include "plugin-api.h"
49 #include "hard-reg-set.h"
57 /* Do nothing; in many cases the default hook. */
64 /* Do nothing (tree). */
67 lhd_do_nothing_t (tree
ARG_UNUSED (t
))
71 /* Pass through (tree). */
73 lhd_pass_through_t (tree t
)
78 /* Do nothing (int, int, int). Return NULL_TREE. */
81 lhd_do_nothing_iii_return_null_tree (int ARG_UNUSED (i
),
88 /* Do nothing (function). */
91 lhd_do_nothing_f (struct function
* ARG_UNUSED (f
))
95 /* Do nothing (return NULL_TREE). */
98 lhd_return_null_tree_v (void)
103 /* Do nothing (return NULL_TREE). */
106 lhd_return_null_tree (tree
ARG_UNUSED (t
))
111 /* Do nothing (return NULL_TREE). */
114 lhd_return_null_const_tree (const_tree
ARG_UNUSED (t
))
119 /* The default post options hook. */
122 lhd_post_options (const char ** ARG_UNUSED (pfilename
))
124 /* Excess precision other than "fast" requires front-end
126 flag_excess_precision_cmdline
= EXCESS_PRECISION_FAST
;
130 /* Called from by print-tree.c. */
133 lhd_print_tree_nothing (FILE * ARG_UNUSED (file
),
134 tree
ARG_UNUSED (node
),
135 int ARG_UNUSED (indent
))
139 /* Called from check_global_declaration. */
142 lhd_warn_unused_global_decl (const_tree decl
)
144 /* This is what used to exist in check_global_declaration. Probably
145 not many of these actually apply to non-C languages. */
147 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_DECLARED_INLINE_P (decl
))
149 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_READONLY (decl
))
151 if (DECL_IN_SYSTEM_HEADER (decl
))
157 /* Set the DECL_ASSEMBLER_NAME for DECL. */
159 lhd_set_decl_assembler_name (tree decl
)
163 /* set_decl_assembler_name may be called on TYPE_DECL to record ODR
164 name for C++ types. By default types have no ODR names. */
165 if (TREE_CODE (decl
) == TYPE_DECL
)
168 /* The language-independent code should never use the
169 DECL_ASSEMBLER_NAME for lots of DECLs. Only FUNCTION_DECLs and
170 VAR_DECLs for variables with static storage duration need a real
171 DECL_ASSEMBLER_NAME. */
172 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
173 || (TREE_CODE (decl
) == VAR_DECL
174 && (TREE_STATIC (decl
)
175 || DECL_EXTERNAL (decl
)
176 || TREE_PUBLIC (decl
))));
178 /* By default, assume the name to use in assembly code is the same
179 as that used in the source language. (That's correct for C, and
180 GCC used to set DECL_ASSEMBLER_NAME to the same value as
181 DECL_NAME in build_decl, so this choice provides backwards
182 compatibility with existing front-ends. This assumption is wrapped
183 in a target hook, to allow for target-specific modification of the
186 Can't use just the variable's own name for a variable whose scope
187 is less than the whole compilation. Concatenate a distinguishing
188 number - we use the DECL_UID. */
190 if (TREE_PUBLIC (decl
) || DECL_FILE_SCOPE_P (decl
))
191 id
= targetm
.mangle_decl_assembler_name (decl
, DECL_NAME (decl
));
194 const char *name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
197 ASM_FORMAT_PRIVATE_NAME (label
, name
, DECL_UID (decl
));
198 id
= get_identifier (label
);
200 SET_DECL_ASSEMBLER_NAME (decl
, id
);
204 /* Type promotion for variable arguments. */
206 lhd_type_promotes_to (tree
ARG_UNUSED (type
))
211 /* Registration of machine- or os-specific builtin types. */
213 lhd_register_builtin_type (tree
ARG_UNUSED (type
),
214 const char * ARG_UNUSED (name
))
218 /* Invalid use of an incomplete type. */
220 lhd_incomplete_type_error (const_tree
ARG_UNUSED (value
), const_tree type
)
222 gcc_assert (TREE_CODE (type
) == ERROR_MARK
);
226 /* Provide a default routine for alias sets that always returns -1. This
227 is used by languages that don't need to do anything special. */
230 lhd_get_alias_set (tree
ARG_UNUSED (t
))
235 /* This is the default decl_printable_name function. */
238 lhd_decl_printable_name (tree decl
, int ARG_UNUSED (verbosity
))
240 gcc_assert (decl
&& DECL_NAME (decl
));
241 return IDENTIFIER_POINTER (DECL_NAME (decl
));
244 /* This is the default dwarf_name function. */
247 lhd_dwarf_name (tree t
, int verbosity
)
249 gcc_assert (DECL_P (t
));
251 return lang_hooks
.decl_printable_name (t
, verbosity
);
254 /* This compares two types for equivalence ("compatible" in C-based languages).
255 This routine should only return 1 if it is sure. It should not be used
256 in contexts where erroneously returning 0 causes problems. */
259 lhd_types_compatible_p (tree x
, tree y
)
261 return TYPE_MAIN_VARIANT (x
) == TYPE_MAIN_VARIANT (y
);
264 /* lang_hooks.tree_dump.dump_tree: Dump language-specific parts of tree
265 nodes. Returns nonzero if it does not want the usual dumping of the
269 lhd_tree_dump_dump_tree (void *di ATTRIBUTE_UNUSED
, tree t ATTRIBUTE_UNUSED
)
274 /* lang_hooks.tree_dump.type_qual: Determine type qualifiers in a
275 language-specific way. */
278 lhd_tree_dump_type_quals (const_tree t
)
280 return TYPE_QUALS (t
);
283 /* lang_hooks.gimplify_expr re-writes *EXPR_P into GIMPLE form. */
286 lhd_gimplify_expr (tree
*expr_p ATTRIBUTE_UNUSED
,
287 gimple_seq
*pre_p ATTRIBUTE_UNUSED
,
288 gimple_seq
*post_p ATTRIBUTE_UNUSED
)
293 /* lang_hooks.tree_size: Determine the size of a tree with code C,
294 which is a language-specific tree code in category tcc_constant or
295 tcc_exceptional. The default expects never to be called. */
297 lhd_tree_size (enum tree_code c ATTRIBUTE_UNUSED
)
302 /* Return true if decl, which is a function decl, may be called by a
306 lhd_decl_ok_for_sibcall (const_tree decl ATTRIBUTE_UNUSED
)
311 /* Generic global declaration processing. This is meant to be called
312 by the front-ends at the end of parsing. C/C++ do their own thing,
313 but other front-ends may call this. */
316 global_decl_processing (void)
318 tree globals
, decl
, *vec
;
321 timevar_stop (TV_PHASE_PARSING
);
322 timevar_start (TV_PHASE_DEFERRED
);
323 /* Really define vars that have had only a tentative definition.
324 Really output inline functions that must actually be callable
325 and have not been output so far. */
327 globals
= lang_hooks
.decls
.getdecls ();
328 len
= list_length (globals
);
329 vec
= XNEWVEC (tree
, len
);
331 /* Process the decls in reverse order--earliest first.
332 Put them into VEC from back to front, then take out from front. */
334 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= DECL_CHAIN (decl
))
335 vec
[len
- i
- 1] = decl
;
337 wrapup_global_declarations (vec
, len
);
338 timevar_stop (TV_PHASE_DEFERRED
);
340 timevar_start (TV_PHASE_PARSING
);
344 /* Called to perform language-specific initialization of CTX. */
346 lhd_initialize_diagnostics (diagnostic_context
*ctx ATTRIBUTE_UNUSED
)
350 /* Called to perform language-specific options initialization. */
352 lhd_init_options (unsigned int decoded_options_count ATTRIBUTE_UNUSED
,
353 struct cl_decoded_option
*decoded_options ATTRIBUTE_UNUSED
)
357 /* By default, always complain about options for the wrong language. */
359 lhd_complain_wrong_lang_p (const struct cl_option
*option ATTRIBUTE_UNUSED
)
364 /* By default, no language-specific options are valid. */
366 lhd_handle_option (size_t code ATTRIBUTE_UNUSED
,
367 const char *arg ATTRIBUTE_UNUSED
,
368 int value ATTRIBUTE_UNUSED
, int kind ATTRIBUTE_UNUSED
,
369 location_t loc ATTRIBUTE_UNUSED
,
370 const struct cl_option_handlers
*handlers ATTRIBUTE_UNUSED
)
375 /* The default function to print out name of current function that caused
378 lhd_print_error_function (diagnostic_context
*context
, const char *file
,
379 diagnostic_info
*diagnostic
)
381 if (diagnostic_last_function_changed (context
, diagnostic
))
383 const char *old_prefix
= context
->printer
->prefix
;
384 tree abstract_origin
= diagnostic_abstract_origin (diagnostic
);
385 char *new_prefix
= (file
&& abstract_origin
== NULL
)
386 ? file_name_as_prefix (context
, file
) : NULL
;
388 pp_set_prefix (context
->printer
, new_prefix
);
390 if (current_function_decl
== NULL
)
391 pp_printf (context
->printer
, _("At top level:"));
398 ao
= BLOCK_ABSTRACT_ORIGIN (abstract_origin
);
399 while (TREE_CODE (ao
) == BLOCK
400 && BLOCK_ABSTRACT_ORIGIN (ao
)
401 && BLOCK_ABSTRACT_ORIGIN (ao
) != ao
)
402 ao
= BLOCK_ABSTRACT_ORIGIN (ao
);
403 gcc_assert (TREE_CODE (ao
) == FUNCTION_DECL
);
407 fndecl
= current_function_decl
;
409 if (TREE_CODE (TREE_TYPE (fndecl
)) == METHOD_TYPE
)
411 (context
->printer
, _("In member function %qs"),
412 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)));
415 (context
->printer
, _("In function %qs"),
416 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)));
418 while (abstract_origin
)
421 tree block
= abstract_origin
;
423 locus
= &BLOCK_SOURCE_LOCATION (block
);
425 block
= BLOCK_SUPERCONTEXT (block
);
426 while (block
&& TREE_CODE (block
) == BLOCK
427 && BLOCK_ABSTRACT_ORIGIN (block
))
429 ao
= BLOCK_ABSTRACT_ORIGIN (block
);
431 while (TREE_CODE (ao
) == BLOCK
432 && BLOCK_ABSTRACT_ORIGIN (ao
)
433 && BLOCK_ABSTRACT_ORIGIN (ao
) != ao
)
434 ao
= BLOCK_ABSTRACT_ORIGIN (ao
);
436 if (TREE_CODE (ao
) == FUNCTION_DECL
)
441 else if (TREE_CODE (ao
) != BLOCK
)
444 block
= BLOCK_SUPERCONTEXT (block
);
447 abstract_origin
= block
;
450 while (block
&& TREE_CODE (block
) == BLOCK
)
451 block
= BLOCK_SUPERCONTEXT (block
);
453 if (block
&& TREE_CODE (block
) == FUNCTION_DECL
)
455 abstract_origin
= NULL
;
459 expanded_location s
= expand_location (*locus
);
460 pp_comma (context
->printer
);
461 pp_newline (context
->printer
);
464 if (context
->show_column
)
465 pp_printf (context
->printer
,
466 _(" inlined from %qs at %r%s:%d:%d%R"),
467 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)),
468 "locus", s
.file
, s
.line
, s
.column
);
470 pp_printf (context
->printer
,
471 _(" inlined from %qs at %r%s:%d%R"),
472 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)),
473 "locus", s
.file
, s
.line
);
477 pp_printf (context
->printer
, _(" inlined from %qs"),
478 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)));
481 pp_colon (context
->printer
);
484 diagnostic_set_last_function (context
, diagnostic
);
485 pp_newline_and_flush (context
->printer
);
486 context
->printer
->prefix
= old_prefix
;
487 free ((char*) new_prefix
);
492 lhd_make_node (enum tree_code code
)
494 return make_node (code
);
498 lhd_to_target_charset (HOST_WIDE_INT c
)
504 lhd_expr_to_decl (tree expr
, bool *tc ATTRIBUTE_UNUSED
, bool *se ATTRIBUTE_UNUSED
)
509 /* Return sharing kind if OpenMP sharing attribute of DECL is
510 predetermined, OMP_CLAUSE_DEFAULT_UNSPECIFIED otherwise. */
512 enum omp_clause_default_kind
513 lhd_omp_predetermined_sharing (tree decl ATTRIBUTE_UNUSED
)
515 if (DECL_ARTIFICIAL (decl
))
516 return OMP_CLAUSE_DEFAULT_SHARED
;
517 return OMP_CLAUSE_DEFAULT_UNSPECIFIED
;
520 /* Generate code to copy SRC to DST. */
523 lhd_omp_assignment (tree clause ATTRIBUTE_UNUSED
, tree dst
, tree src
)
525 return build2 (MODIFY_EXPR
, TREE_TYPE (dst
), dst
, src
);
528 /* Finalize clause C. */
531 lhd_omp_finish_clause (tree
, gimple_seq
*)
535 /* Register language specific type size variables as potentially OpenMP
536 firstprivate variables. */
539 lhd_omp_firstprivatize_type_sizes (struct gimplify_omp_ctx
*c ATTRIBUTE_UNUSED
,
540 tree t ATTRIBUTE_UNUSED
)
544 /* Return true if TYPE is an OpenMP mappable type. */
547 lhd_omp_mappable_type (tree type
)
549 /* Mappable type has to be complete. */
550 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
555 /* Common function for add_builtin_function and
556 add_builtin_function_ext_scope. */
558 add_builtin_function_common (const char *name
,
561 enum built_in_class cl
,
562 const char *library_name
,
566 tree id
= get_identifier (name
);
567 tree decl
= build_decl (BUILTINS_LOCATION
, FUNCTION_DECL
, id
, type
);
569 TREE_PUBLIC (decl
) = 1;
570 DECL_EXTERNAL (decl
) = 1;
571 DECL_BUILT_IN_CLASS (decl
) = cl
;
573 DECL_FUNCTION_CODE (decl
) = (enum built_in_function
) function_code
;
575 /* DECL_FUNCTION_CODE is a bitfield; verify that the value fits. */
576 gcc_assert (DECL_FUNCTION_CODE (decl
) == function_code
);
580 tree libname
= get_identifier (library_name
);
581 SET_DECL_ASSEMBLER_NAME (decl
, libname
);
584 /* Possibly apply some default attributes to this built-in function. */
586 decl_attributes (&decl
, attrs
, ATTR_FLAG_BUILT_IN
);
588 decl_attributes (&decl
, NULL_TREE
, 0);
594 /* Create a builtin function. */
597 add_builtin_function (const char *name
,
600 enum built_in_class cl
,
601 const char *library_name
,
604 return add_builtin_function_common (name
, type
, function_code
, cl
,
606 lang_hooks
.builtin_function
);
609 /* Like add_builtin_function, but make sure the scope is the external scope.
610 This is used to delay putting in back end builtin functions until the ISA
611 that defines the builtin is declared via function specific target options,
612 which can save memory for machines like the x86_64 that have multiple ISAs.
613 If this points to the same function as builtin_function, the backend must
614 add all of the builtins at program initialization time. */
617 add_builtin_function_ext_scope (const char *name
,
620 enum built_in_class cl
,
621 const char *library_name
,
624 return add_builtin_function_common (name
, type
, function_code
, cl
,
626 lang_hooks
.builtin_function_ext_scope
);
630 lhd_builtin_function (tree decl
)
632 lang_hooks
.decls
.pushdecl (decl
);
636 /* Create a builtin type. */
639 add_builtin_type (const char *name
, tree type
)
641 tree id
= get_identifier (name
);
642 tree decl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, id
, type
);
643 return lang_hooks
.decls
.pushdecl (decl
);
648 /* Used to save and restore any previously active section. */
649 static section
*saved_section
;
652 /* Begin a new LTO output section named NAME. This default implementation
653 saves the old section and emits assembly code to switch to the new
657 lhd_begin_section (const char *name
)
661 /* Save the old section so we can restore it in lto_end_asm_section. */
662 gcc_assert (!saved_section
);
663 saved_section
= in_section
;
665 saved_section
= text_section
;
667 /* Create a new section and switch to it. */
668 section
= get_section (name
, SECTION_DEBUG
| SECTION_EXCLUDE
, NULL
);
669 switch_to_section (section
);
673 /* Write DATA of length LEN to the current LTO output section. This default
674 implementation just calls assemble_string. */
677 lhd_append_data (const void *data
, size_t len
, void *)
680 assemble_string ((const char *)data
, len
);
684 /* Finish the current LTO output section. This default implementation emits
685 assembly code to switch to any section previously saved by
686 lhd_begin_section. */
689 lhd_end_section (void)
693 switch_to_section (saved_section
);
694 saved_section
= NULL
;
698 /* Default implementation of enum_underlying_base_type using type_for_size. */
701 lhd_enum_underlying_base_type (const_tree enum_type
)
703 return lang_hooks
.types
.type_for_size (TYPE_PRECISION (enum_type
),
704 TYPE_UNSIGNED (enum_type
));
707 /* Returns true if the current lang_hooks represents the GNU C frontend. */
712 return (strncmp (lang_hooks
.name
, "GNU C", 5) == 0
713 && (lang_hooks
.name
[5] == '\0' || ISDIGIT (lang_hooks
.name
[5])));
716 /* Returns true if the current lang_hooks represents the GNU C++ frontend. */
721 return strncmp (lang_hooks
.name
, "GNU C++", 7) == 0;
724 /* Returns true if the current lang_hooks represents the GNU Fortran frontend. */
727 lang_GNU_Fortran (void)
729 return strncmp (lang_hooks
.name
, "GNU Fortran", 11) == 0;