1 /* Default language-specific hooks.
2 Copyright (C) 2001-2016 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"
28 #include "stringpool.h"
29 #include "diagnostic.h"
34 #include "langhooks.h"
35 #include "tree-diagnostic.h"
39 /* Do nothing; in many cases the default hook. */
46 /* Do nothing (tree). */
49 lhd_do_nothing_t (tree
ARG_UNUSED (t
))
53 /* Pass through (tree). */
55 lhd_pass_through_t (tree t
)
60 /* Do nothing (int, int, int). Return NULL_TREE. */
63 lhd_do_nothing_iii_return_null_tree (int ARG_UNUSED (i
),
70 /* Do nothing (function). */
73 lhd_do_nothing_f (struct function
* ARG_UNUSED (f
))
77 /* Do nothing (return NULL_TREE). */
80 lhd_return_null_tree (tree
ARG_UNUSED (t
))
85 /* Do nothing (return NULL_TREE). */
88 lhd_return_null_const_tree (const_tree
ARG_UNUSED (t
))
93 /* The default post options hook. */
96 lhd_post_options (const char ** ARG_UNUSED (pfilename
))
98 /* Excess precision other than "fast" requires front-end
100 flag_excess_precision_cmdline
= EXCESS_PRECISION_FAST
;
104 /* Called from by print-tree.c. */
107 lhd_print_tree_nothing (FILE * ARG_UNUSED (file
),
108 tree
ARG_UNUSED (node
),
109 int ARG_UNUSED (indent
))
113 /* Called from check_global_declaration. */
116 lhd_warn_unused_global_decl (const_tree decl
)
118 /* This is what used to exist in check_global_declaration. Probably
119 not many of these actually apply to non-C languages. */
121 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_DECLARED_INLINE_P (decl
))
123 if (VAR_P (decl
) && TREE_READONLY (decl
))
125 if (DECL_IN_SYSTEM_HEADER (decl
))
131 /* Set the DECL_ASSEMBLER_NAME for DECL. */
133 lhd_set_decl_assembler_name (tree decl
)
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
)
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
148 && (TREE_STATIC (decl
)
149 || DECL_EXTERNAL (decl
)
150 || TREE_PUBLIC (decl
))));
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
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. */
164 if (TREE_PUBLIC (decl
) || DECL_FILE_SCOPE_P (decl
))
165 id
= targetm
.mangle_decl_assembler_name (decl
, DECL_NAME (decl
));
168 const char *name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
171 ASM_FORMAT_PRIVATE_NAME (label
, name
, DECL_UID (decl
));
172 id
= get_identifier (label
);
174 SET_DECL_ASSEMBLER_NAME (decl
, id
);
178 /* Type promotion for variable arguments. */
180 lhd_type_promotes_to (tree
ARG_UNUSED (type
))
185 /* Registration of machine- or os-specific builtin types. */
187 lhd_register_builtin_type (tree
ARG_UNUSED (type
),
188 const char * ARG_UNUSED (name
))
192 /* Invalid use of an incomplete type. */
194 lhd_incomplete_type_error (location_t
ARG_UNUSED (loc
),
195 const_tree
ARG_UNUSED (value
), const_tree type
)
197 gcc_assert (TREE_CODE (type
) == ERROR_MARK
);
201 /* Provide a default routine for alias sets that always returns -1. This
202 is used by languages that don't need to do anything special. */
205 lhd_get_alias_set (tree
ARG_UNUSED (t
))
210 /* This is the default decl_printable_name function. */
213 lhd_decl_printable_name (tree decl
, int ARG_UNUSED (verbosity
))
215 gcc_assert (decl
&& DECL_NAME (decl
));
216 return IDENTIFIER_POINTER (DECL_NAME (decl
));
219 /* This is the default dwarf_name function. */
222 lhd_dwarf_name (tree t
, int verbosity
)
224 gcc_assert (DECL_P (t
));
226 return lang_hooks
.decl_printable_name (t
, verbosity
);
229 /* This compares two types for equivalence ("compatible" in C-based languages).
230 This routine should only return 1 if it is sure. It should not be used
231 in contexts where erroneously returning 0 causes problems. */
234 lhd_types_compatible_p (tree x
, tree y
)
236 return TYPE_MAIN_VARIANT (x
) == TYPE_MAIN_VARIANT (y
);
239 /* lang_hooks.tree_dump.dump_tree: Dump language-specific parts of tree
240 nodes. Returns nonzero if it does not want the usual dumping of the
244 lhd_tree_dump_dump_tree (void *di ATTRIBUTE_UNUSED
, tree t ATTRIBUTE_UNUSED
)
249 /* lang_hooks.tree_dump.type_qual: Determine type qualifiers in a
250 language-specific way. */
253 lhd_tree_dump_type_quals (const_tree t
)
255 return TYPE_QUALS (t
);
258 /* lang_hooks.gimplify_expr re-writes *EXPR_P into GIMPLE form. */
261 lhd_gimplify_expr (tree
*expr_p ATTRIBUTE_UNUSED
,
262 gimple_seq
*pre_p ATTRIBUTE_UNUSED
,
263 gimple_seq
*post_p ATTRIBUTE_UNUSED
)
268 /* lang_hooks.tree_size: Determine the size of a tree with code C,
269 which is a language-specific tree code in category tcc_constant or
270 tcc_exceptional. The default expects never to be called. */
272 lhd_tree_size (enum tree_code c ATTRIBUTE_UNUSED
)
277 /* Return true if decl, which is a function decl, may be called by a
281 lhd_decl_ok_for_sibcall (const_tree decl ATTRIBUTE_UNUSED
)
286 /* Generic global declaration processing. This is meant to be called
287 by the front-ends at the end of parsing. C/C++ do their own thing,
288 but other front-ends may call this. */
291 global_decl_processing (void)
293 tree globals
, decl
, *vec
;
296 timevar_stop (TV_PHASE_PARSING
);
297 timevar_start (TV_PHASE_DEFERRED
);
298 /* Really define vars that have had only a tentative definition.
299 Really output inline functions that must actually be callable
300 and have not been output so far. */
302 globals
= lang_hooks
.decls
.getdecls ();
303 len
= list_length (globals
);
304 vec
= XNEWVEC (tree
, len
);
306 /* Process the decls in reverse order--earliest first.
307 Put them into VEC from back to front, then take out from front. */
309 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= DECL_CHAIN (decl
))
310 vec
[len
- i
- 1] = decl
;
312 wrapup_global_declarations (vec
, len
);
313 timevar_stop (TV_PHASE_DEFERRED
);
315 timevar_start (TV_PHASE_PARSING
);
319 /* Called to perform language-specific initialization of CTX. */
321 lhd_initialize_diagnostics (diagnostic_context
*ctx ATTRIBUTE_UNUSED
)
325 /* Called to perform language-specific options initialization. */
327 lhd_init_options (unsigned int decoded_options_count ATTRIBUTE_UNUSED
,
328 struct cl_decoded_option
*decoded_options ATTRIBUTE_UNUSED
)
332 /* By default, always complain about options for the wrong language. */
334 lhd_complain_wrong_lang_p (const struct cl_option
*option ATTRIBUTE_UNUSED
)
339 /* By default, no language-specific options are valid. */
341 lhd_handle_option (size_t code ATTRIBUTE_UNUSED
,
342 const char *arg ATTRIBUTE_UNUSED
,
343 int value ATTRIBUTE_UNUSED
, int kind ATTRIBUTE_UNUSED
,
344 location_t loc ATTRIBUTE_UNUSED
,
345 const struct cl_option_handlers
*handlers ATTRIBUTE_UNUSED
)
350 /* The default function to print out name of current function that caused
353 lhd_print_error_function (diagnostic_context
*context
, const char *file
,
354 diagnostic_info
*diagnostic
)
356 if (diagnostic_last_function_changed (context
, diagnostic
))
358 const char *old_prefix
= context
->printer
->prefix
;
359 tree abstract_origin
= diagnostic_abstract_origin (diagnostic
);
360 char *new_prefix
= (file
&& abstract_origin
== NULL
)
361 ? file_name_as_prefix (context
, file
) : NULL
;
363 pp_set_prefix (context
->printer
, new_prefix
);
365 if (current_function_decl
== NULL
)
366 pp_printf (context
->printer
, _("At top level:"));
373 ao
= BLOCK_ABSTRACT_ORIGIN (abstract_origin
);
374 while (TREE_CODE (ao
) == BLOCK
375 && BLOCK_ABSTRACT_ORIGIN (ao
)
376 && BLOCK_ABSTRACT_ORIGIN (ao
) != ao
)
377 ao
= BLOCK_ABSTRACT_ORIGIN (ao
);
378 gcc_assert (TREE_CODE (ao
) == FUNCTION_DECL
);
382 fndecl
= current_function_decl
;
384 if (TREE_CODE (TREE_TYPE (fndecl
)) == METHOD_TYPE
)
386 (context
->printer
, _("In member function %qs"),
387 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)));
390 (context
->printer
, _("In function %qs"),
391 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)));
393 while (abstract_origin
)
396 tree block
= abstract_origin
;
398 locus
= &BLOCK_SOURCE_LOCATION (block
);
400 block
= BLOCK_SUPERCONTEXT (block
);
401 while (block
&& TREE_CODE (block
) == BLOCK
402 && BLOCK_ABSTRACT_ORIGIN (block
))
404 ao
= BLOCK_ABSTRACT_ORIGIN (block
);
406 while (TREE_CODE (ao
) == BLOCK
407 && BLOCK_ABSTRACT_ORIGIN (ao
)
408 && BLOCK_ABSTRACT_ORIGIN (ao
) != ao
)
409 ao
= BLOCK_ABSTRACT_ORIGIN (ao
);
411 if (TREE_CODE (ao
) == FUNCTION_DECL
)
416 else if (TREE_CODE (ao
) != BLOCK
)
419 block
= BLOCK_SUPERCONTEXT (block
);
422 abstract_origin
= block
;
425 while (block
&& TREE_CODE (block
) == BLOCK
)
426 block
= BLOCK_SUPERCONTEXT (block
);
428 if (block
&& TREE_CODE (block
) == FUNCTION_DECL
)
430 abstract_origin
= NULL
;
434 expanded_location s
= expand_location (*locus
);
435 pp_comma (context
->printer
);
436 pp_newline (context
->printer
);
439 if (context
->show_column
)
440 pp_printf (context
->printer
,
441 _(" inlined from %qs at %r%s:%d:%d%R"),
442 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)),
443 "locus", s
.file
, s
.line
, s
.column
);
445 pp_printf (context
->printer
,
446 _(" inlined from %qs at %r%s:%d%R"),
447 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)),
448 "locus", s
.file
, s
.line
);
452 pp_printf (context
->printer
, _(" inlined from %qs"),
453 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)));
456 pp_colon (context
->printer
);
459 diagnostic_set_last_function (context
, diagnostic
);
460 pp_newline_and_flush (context
->printer
);
461 context
->printer
->prefix
= old_prefix
;
462 free ((char*) new_prefix
);
467 lhd_make_node (enum tree_code code
)
469 return make_node (code
);
473 lhd_to_target_charset (HOST_WIDE_INT c
)
479 lhd_expr_to_decl (tree expr
, bool *tc ATTRIBUTE_UNUSED
, bool *se ATTRIBUTE_UNUSED
)
484 /* Return sharing kind if OpenMP sharing attribute of DECL is
485 predetermined, OMP_CLAUSE_DEFAULT_UNSPECIFIED otherwise. */
487 enum omp_clause_default_kind
488 lhd_omp_predetermined_sharing (tree decl ATTRIBUTE_UNUSED
)
490 if (DECL_ARTIFICIAL (decl
))
491 return OMP_CLAUSE_DEFAULT_SHARED
;
492 return OMP_CLAUSE_DEFAULT_UNSPECIFIED
;
495 /* Generate code to copy SRC to DST. */
498 lhd_omp_assignment (tree clause ATTRIBUTE_UNUSED
, tree dst
, tree src
)
500 return build2 (MODIFY_EXPR
, TREE_TYPE (dst
), dst
, src
);
503 /* Finalize clause C. */
506 lhd_omp_finish_clause (tree
, gimple_seq
*)
510 /* Register language specific type size variables as potentially OpenMP
511 firstprivate variables. */
514 lhd_omp_firstprivatize_type_sizes (struct gimplify_omp_ctx
*c ATTRIBUTE_UNUSED
,
515 tree t ATTRIBUTE_UNUSED
)
519 /* Return true if TYPE is an OpenMP mappable type. */
522 lhd_omp_mappable_type (tree type
)
524 /* Mappable type has to be complete. */
525 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
530 /* Common function for add_builtin_function and
531 add_builtin_function_ext_scope. */
533 add_builtin_function_common (const char *name
,
536 enum built_in_class cl
,
537 const char *library_name
,
541 tree id
= get_identifier (name
);
542 tree decl
= build_decl (BUILTINS_LOCATION
, FUNCTION_DECL
, id
, type
);
544 TREE_PUBLIC (decl
) = 1;
545 DECL_EXTERNAL (decl
) = 1;
546 DECL_BUILT_IN_CLASS (decl
) = cl
;
548 DECL_FUNCTION_CODE (decl
) = (enum built_in_function
) function_code
;
550 /* DECL_FUNCTION_CODE is a bitfield; verify that the value fits. */
551 gcc_assert (DECL_FUNCTION_CODE (decl
) == function_code
);
555 tree libname
= get_identifier (library_name
);
557 libname
= targetm
.mangle_decl_assembler_name (decl
, libname
);
558 SET_DECL_ASSEMBLER_NAME (decl
, libname
);
561 /* Possibly apply some default attributes to this built-in function. */
563 decl_attributes (&decl
, attrs
, ATTR_FLAG_BUILT_IN
);
565 decl_attributes (&decl
, NULL_TREE
, 0);
571 /* Create a builtin function. */
574 add_builtin_function (const char *name
,
577 enum built_in_class cl
,
578 const char *library_name
,
581 return add_builtin_function_common (name
, type
, function_code
, cl
,
583 lang_hooks
.builtin_function
);
586 /* Like add_builtin_function, but make sure the scope is the external scope.
587 This is used to delay putting in back end builtin functions until the ISA
588 that defines the builtin is declared via function specific target options,
589 which can save memory for machines like the x86_64 that have multiple ISAs.
590 If this points to the same function as builtin_function, the backend must
591 add all of the builtins at program initialization time. */
594 add_builtin_function_ext_scope (const char *name
,
597 enum built_in_class cl
,
598 const char *library_name
,
601 return add_builtin_function_common (name
, type
, function_code
, cl
,
603 lang_hooks
.builtin_function_ext_scope
);
607 lhd_builtin_function (tree decl
)
609 lang_hooks
.decls
.pushdecl (decl
);
613 /* Create a builtin type. */
616 add_builtin_type (const char *name
, tree type
)
618 tree id
= get_identifier (name
);
619 tree decl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, id
, type
);
620 return lang_hooks
.decls
.pushdecl (decl
);
625 /* Used to save and restore any previously active section. */
626 static section
*saved_section
;
629 /* Begin a new LTO output section named NAME. This default implementation
630 saves the old section and emits assembly code to switch to the new
634 lhd_begin_section (const char *name
)
638 /* Save the old section so we can restore it in lto_end_asm_section. */
639 gcc_assert (!saved_section
);
640 saved_section
= in_section
;
642 saved_section
= text_section
;
644 /* Create a new section and switch to it. */
645 section
= get_section (name
, SECTION_DEBUG
| SECTION_EXCLUDE
, NULL
);
646 switch_to_section (section
);
650 /* Write DATA of length LEN to the current LTO output section. This default
651 implementation just calls assemble_string. */
654 lhd_append_data (const void *data
, size_t len
, void *)
658 timevar_push (TV_IPA_LTO_OUTPUT
);
659 assemble_string ((const char *)data
, len
);
660 timevar_pop (TV_IPA_LTO_OUTPUT
);
665 /* Finish the current LTO output section. This default implementation emits
666 assembly code to switch to any section previously saved by
667 lhd_begin_section. */
670 lhd_end_section (void)
674 switch_to_section (saved_section
);
675 saved_section
= NULL
;
679 /* Default implementation of enum_underlying_base_type using type_for_size. */
682 lhd_enum_underlying_base_type (const_tree enum_type
)
684 return lang_hooks
.types
.type_for_size (TYPE_PRECISION (enum_type
),
685 TYPE_UNSIGNED (enum_type
));
688 /* Default implementation of LANG_HOOKS_GET_SUBSTRING_LOCATION. */
691 lhd_get_substring_location (const substring_loc
&, location_t
*)
693 return "unimplemented";
696 /* Default implementation of LANG_HOOKS_DECL_DWARF_ATTRIBUTE. Don't add
700 lhd_decl_dwarf_attribute (const_tree
, int)
705 /* Default implementation of LANG_HOOKS_TYPE_DWARF_ATTRIBUTE. Don't add
709 lhd_type_dwarf_attribute (const_tree
, int)
714 /* Returns true if the current lang_hooks represents the GNU C frontend. */
719 return (strncmp (lang_hooks
.name
, "GNU C", 5) == 0
720 && (lang_hooks
.name
[5] == '\0' || ISDIGIT (lang_hooks
.name
[5])));
723 /* Returns true if the current lang_hooks represents the GNU C++ frontend. */
728 return strncmp (lang_hooks
.name
, "GNU C++", 7) == 0;
731 /* Returns true if the current lang_hooks represents the GNU Fortran frontend. */
734 lang_GNU_Fortran (void)
736 return strncmp (lang_hooks
.name
, "GNU Fortran", 11) == 0;
739 /* Returns true if the current lang_hooks represents the GNU Objective-C
745 return strncmp (lang_hooks
.name
, "GNU Objective-C", 15) == 0;