1 /* Default language-specific hooks.
2 Copyright (C) 2001-2017 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 register dumps. */
327 lhd_register_dumps (gcc::dump_manager
*)
331 /* Called to perform language-specific options initialization. */
333 lhd_init_options (unsigned int decoded_options_count ATTRIBUTE_UNUSED
,
334 struct cl_decoded_option
*decoded_options ATTRIBUTE_UNUSED
)
338 /* By default, always complain about options for the wrong language. */
340 lhd_complain_wrong_lang_p (const struct cl_option
*option ATTRIBUTE_UNUSED
)
345 /* By default, no language-specific options are valid. */
347 lhd_handle_option (size_t code ATTRIBUTE_UNUSED
,
348 const char *arg ATTRIBUTE_UNUSED
,
349 int value ATTRIBUTE_UNUSED
, int kind ATTRIBUTE_UNUSED
,
350 location_t loc ATTRIBUTE_UNUSED
,
351 const struct cl_option_handlers
*handlers ATTRIBUTE_UNUSED
)
356 /* The default function to print out name of current function that caused
359 lhd_print_error_function (diagnostic_context
*context
, const char *file
,
360 diagnostic_info
*diagnostic
)
362 if (diagnostic_last_function_changed (context
, diagnostic
))
364 const char *old_prefix
= context
->printer
->prefix
;
365 tree abstract_origin
= diagnostic_abstract_origin (diagnostic
);
366 char *new_prefix
= (file
&& abstract_origin
== NULL
)
367 ? file_name_as_prefix (context
, file
) : NULL
;
369 pp_set_prefix (context
->printer
, new_prefix
);
371 if (current_function_decl
== NULL
)
372 pp_printf (context
->printer
, _("At top level:"));
379 ao
= BLOCK_ABSTRACT_ORIGIN (abstract_origin
);
380 while (TREE_CODE (ao
) == BLOCK
381 && BLOCK_ABSTRACT_ORIGIN (ao
)
382 && BLOCK_ABSTRACT_ORIGIN (ao
) != ao
)
383 ao
= BLOCK_ABSTRACT_ORIGIN (ao
);
384 gcc_assert (TREE_CODE (ao
) == FUNCTION_DECL
);
388 fndecl
= current_function_decl
;
390 if (TREE_CODE (TREE_TYPE (fndecl
)) == METHOD_TYPE
)
392 (context
->printer
, _("In member function %qs"),
393 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)));
396 (context
->printer
, _("In function %qs"),
397 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)));
399 while (abstract_origin
)
402 tree block
= abstract_origin
;
404 locus
= &BLOCK_SOURCE_LOCATION (block
);
406 block
= BLOCK_SUPERCONTEXT (block
);
407 while (block
&& TREE_CODE (block
) == BLOCK
408 && BLOCK_ABSTRACT_ORIGIN (block
))
410 ao
= BLOCK_ABSTRACT_ORIGIN (block
);
412 while (TREE_CODE (ao
) == BLOCK
413 && BLOCK_ABSTRACT_ORIGIN (ao
)
414 && BLOCK_ABSTRACT_ORIGIN (ao
) != ao
)
415 ao
= BLOCK_ABSTRACT_ORIGIN (ao
);
417 if (TREE_CODE (ao
) == FUNCTION_DECL
)
422 else if (TREE_CODE (ao
) != BLOCK
)
425 block
= BLOCK_SUPERCONTEXT (block
);
428 abstract_origin
= block
;
431 while (block
&& TREE_CODE (block
) == BLOCK
)
432 block
= BLOCK_SUPERCONTEXT (block
);
434 if (block
&& TREE_CODE (block
) == FUNCTION_DECL
)
436 abstract_origin
= NULL
;
440 expanded_location s
= expand_location (*locus
);
441 pp_comma (context
->printer
);
442 pp_newline (context
->printer
);
445 if (context
->show_column
)
446 pp_printf (context
->printer
,
447 _(" inlined from %qs at %r%s:%d:%d%R"),
448 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)),
449 "locus", s
.file
, s
.line
, s
.column
);
451 pp_printf (context
->printer
,
452 _(" inlined from %qs at %r%s:%d%R"),
453 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)),
454 "locus", s
.file
, s
.line
);
458 pp_printf (context
->printer
, _(" inlined from %qs"),
459 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)));
462 pp_colon (context
->printer
);
465 diagnostic_set_last_function (context
, diagnostic
);
466 pp_newline_and_flush (context
->printer
);
467 context
->printer
->prefix
= old_prefix
;
468 free ((char*) new_prefix
);
473 lhd_make_node (enum tree_code code
)
475 return make_node (code
);
478 /* Default implementation of LANG_HOOKS_TYPE_FOR_SIZE.
479 Return an integer type with PRECISION bits of precision,
480 that is unsigned if UNSIGNEDP is nonzero, otherwise signed. */
483 lhd_type_for_size (unsigned precision
, int unsignedp
)
487 if (precision
== TYPE_PRECISION (integer_type_node
))
488 return unsignedp
? unsigned_type_node
: integer_type_node
;
490 if (precision
== TYPE_PRECISION (signed_char_type_node
))
491 return unsignedp
? unsigned_char_type_node
: signed_char_type_node
;
493 if (precision
== TYPE_PRECISION (short_integer_type_node
))
494 return unsignedp
? short_unsigned_type_node
: short_integer_type_node
;
496 if (precision
== TYPE_PRECISION (long_integer_type_node
))
497 return unsignedp
? long_unsigned_type_node
: long_integer_type_node
;
499 if (precision
== TYPE_PRECISION (long_long_integer_type_node
))
501 ? long_long_unsigned_type_node
502 : long_long_integer_type_node
;
504 for (i
= 0; i
< NUM_INT_N_ENTS
; i
++)
505 if (int_n_enabled_p
[i
]
506 && precision
== int_n_data
[i
].bitsize
)
507 return (unsignedp
? int_n_trees
[i
].unsigned_type
508 : int_n_trees
[i
].signed_type
);
510 if (precision
<= TYPE_PRECISION (intQI_type_node
))
511 return unsignedp
? unsigned_intQI_type_node
: intQI_type_node
;
513 if (precision
<= TYPE_PRECISION (intHI_type_node
))
514 return unsignedp
? unsigned_intHI_type_node
: intHI_type_node
;
516 if (precision
<= TYPE_PRECISION (intSI_type_node
))
517 return unsignedp
? unsigned_intSI_type_node
: intSI_type_node
;
519 if (precision
<= TYPE_PRECISION (intDI_type_node
))
520 return unsignedp
? unsigned_intDI_type_node
: intDI_type_node
;
522 if (precision
<= TYPE_PRECISION (intTI_type_node
))
523 return unsignedp
? unsigned_intTI_type_node
: intTI_type_node
;
529 lhd_to_target_charset (HOST_WIDE_INT c
)
535 lhd_expr_to_decl (tree expr
, bool *tc ATTRIBUTE_UNUSED
, bool *se ATTRIBUTE_UNUSED
)
540 /* Return sharing kind if OpenMP sharing attribute of DECL is
541 predetermined, OMP_CLAUSE_DEFAULT_UNSPECIFIED otherwise. */
543 enum omp_clause_default_kind
544 lhd_omp_predetermined_sharing (tree decl ATTRIBUTE_UNUSED
)
546 if (DECL_ARTIFICIAL (decl
))
547 return OMP_CLAUSE_DEFAULT_SHARED
;
548 return OMP_CLAUSE_DEFAULT_UNSPECIFIED
;
551 /* Generate code to copy SRC to DST. */
554 lhd_omp_assignment (tree clause ATTRIBUTE_UNUSED
, tree dst
, tree src
)
556 return build2 (MODIFY_EXPR
, TREE_TYPE (dst
), dst
, src
);
559 /* Finalize clause C. */
562 lhd_omp_finish_clause (tree
, gimple_seq
*)
566 /* Return true if DECL is a scalar variable (for the purpose of
567 implicit firstprivatization). */
570 lhd_omp_scalar_p (tree decl
)
572 tree type
= TREE_TYPE (decl
);
573 if (TREE_CODE (type
) == REFERENCE_TYPE
)
574 type
= TREE_TYPE (type
);
575 if (TREE_CODE (type
) == COMPLEX_TYPE
)
576 type
= TREE_TYPE (type
);
577 if (INTEGRAL_TYPE_P (type
)
578 || SCALAR_FLOAT_TYPE_P (type
)
579 || TREE_CODE (type
) == POINTER_TYPE
)
584 /* Register language specific type size variables as potentially OpenMP
585 firstprivate variables. */
588 lhd_omp_firstprivatize_type_sizes (struct gimplify_omp_ctx
*c ATTRIBUTE_UNUSED
,
589 tree t ATTRIBUTE_UNUSED
)
593 /* Return true if TYPE is an OpenMP mappable type. */
596 lhd_omp_mappable_type (tree type
)
598 /* Mappable type has to be complete. */
599 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
604 /* Common function for add_builtin_function and
605 add_builtin_function_ext_scope. */
607 add_builtin_function_common (const char *name
,
610 enum built_in_class cl
,
611 const char *library_name
,
615 tree id
= get_identifier (name
);
616 tree decl
= build_decl (BUILTINS_LOCATION
, FUNCTION_DECL
, id
, type
);
618 TREE_PUBLIC (decl
) = 1;
619 DECL_EXTERNAL (decl
) = 1;
620 DECL_BUILT_IN_CLASS (decl
) = cl
;
622 DECL_FUNCTION_CODE (decl
) = (enum built_in_function
) function_code
;
624 /* DECL_FUNCTION_CODE is a bitfield; verify that the value fits. */
625 gcc_assert (DECL_FUNCTION_CODE (decl
) == function_code
);
629 tree libname
= get_identifier (library_name
);
631 libname
= targetm
.mangle_decl_assembler_name (decl
, libname
);
632 SET_DECL_ASSEMBLER_NAME (decl
, libname
);
635 /* Possibly apply some default attributes to this built-in function. */
637 decl_attributes (&decl
, attrs
, ATTR_FLAG_BUILT_IN
);
639 decl_attributes (&decl
, NULL_TREE
, 0);
645 /* Create a builtin function. */
648 add_builtin_function (const char *name
,
651 enum built_in_class cl
,
652 const char *library_name
,
655 return add_builtin_function_common (name
, type
, function_code
, cl
,
657 lang_hooks
.builtin_function
);
660 /* Like add_builtin_function, but make sure the scope is the external scope.
661 This is used to delay putting in back end builtin functions until the ISA
662 that defines the builtin is declared via function specific target options,
663 which can save memory for machines like the x86_64 that have multiple ISAs.
664 If this points to the same function as builtin_function, the backend must
665 add all of the builtins at program initialization time. */
668 add_builtin_function_ext_scope (const char *name
,
671 enum built_in_class cl
,
672 const char *library_name
,
675 return add_builtin_function_common (name
, type
, function_code
, cl
,
677 lang_hooks
.builtin_function_ext_scope
);
681 lhd_builtin_function (tree decl
)
683 lang_hooks
.decls
.pushdecl (decl
);
687 /* Create a builtin type. */
690 add_builtin_type (const char *name
, tree type
)
692 tree id
= get_identifier (name
);
693 tree decl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, id
, type
);
694 return lang_hooks
.decls
.pushdecl (decl
);
699 /* Used to save and restore any previously active section. */
700 static section
*saved_section
;
703 /* Begin a new LTO output section named NAME. This default implementation
704 saves the old section and emits assembly code to switch to the new
708 lhd_begin_section (const char *name
)
712 /* Save the old section so we can restore it in lto_end_asm_section. */
713 gcc_assert (!saved_section
);
714 saved_section
= in_section
;
716 saved_section
= text_section
;
718 /* Create a new section and switch to it. */
719 section
= get_section (name
, SECTION_DEBUG
| SECTION_EXCLUDE
, NULL
);
720 switch_to_section (section
);
724 /* Write DATA of length LEN to the current LTO output section. This default
725 implementation just calls assemble_string. */
728 lhd_append_data (const void *data
, size_t len
, void *)
732 timevar_push (TV_IPA_LTO_OUTPUT
);
733 assemble_string ((const char *)data
, len
);
734 timevar_pop (TV_IPA_LTO_OUTPUT
);
739 /* Finish the current LTO output section. This default implementation emits
740 assembly code to switch to any section previously saved by
741 lhd_begin_section. */
744 lhd_end_section (void)
748 switch_to_section (saved_section
);
749 saved_section
= NULL
;
753 /* Default implementation of enum_underlying_base_type using type_for_size. */
756 lhd_enum_underlying_base_type (const_tree enum_type
)
758 return lang_hooks
.types
.type_for_size (TYPE_PRECISION (enum_type
),
759 TYPE_UNSIGNED (enum_type
));
762 /* Default implementation of LANG_HOOKS_GET_SUBSTRING_LOCATION. */
765 lhd_get_substring_location (const substring_loc
&, location_t
*)
767 return "unimplemented";
770 /* Default implementation of LANG_HOOKS_DECL_DWARF_ATTRIBUTE. Don't add
774 lhd_decl_dwarf_attribute (const_tree
, int)
779 /* Default implementation of LANG_HOOKS_TYPE_DWARF_ATTRIBUTE. Don't add
783 lhd_type_dwarf_attribute (const_tree
, int)
788 /* Default implementation of LANG_HOOKS_UNIT_SIZE_WITHOUT_REUSABLE_PADDING.
789 Just return TYPE_SIZE_UNIT unadjusted. */
792 lhd_unit_size_without_reusable_padding (tree t
)
794 return TYPE_SIZE_UNIT (t
);
797 /* Returns true if the current lang_hooks represents the GNU C frontend. */
802 return (strncmp (lang_hooks
.name
, "GNU C", 5) == 0
803 && (lang_hooks
.name
[5] == '\0' || ISDIGIT (lang_hooks
.name
[5])));
806 /* Returns true if the current lang_hooks represents the GNU C++ frontend. */
811 return strncmp (lang_hooks
.name
, "GNU C++", 7) == 0;
814 /* Returns true if the current lang_hooks represents the GNU Fortran frontend. */
817 lang_GNU_Fortran (void)
819 return strncmp (lang_hooks
.name
, "GNU Fortran", 11) == 0;
822 /* Returns true if the current lang_hooks represents the GNU Objective-C
828 return strncmp (lang_hooks
.name
, "GNU Objective-C", 15) == 0;