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"
31 #include "stringpool.h"
33 #include "tree-inline.h"
36 #include "insn-config.h"
38 #include "langhooks.h"
40 #include "langhooks-def.h"
41 #include "diagnostic.h"
42 #include "tree-diagnostic.h"
44 #include "plugin-api.h"
45 #include "hard-reg-set.h"
53 /* Do nothing; in many cases the default hook. */
60 /* Do nothing (tree). */
63 lhd_do_nothing_t (tree
ARG_UNUSED (t
))
67 /* Pass through (tree). */
69 lhd_pass_through_t (tree t
)
74 /* Do nothing (int, int, int). Return NULL_TREE. */
77 lhd_do_nothing_iii_return_null_tree (int ARG_UNUSED (i
),
84 /* Do nothing (function). */
87 lhd_do_nothing_f (struct function
* ARG_UNUSED (f
))
91 /* Do nothing (return NULL_TREE). */
94 lhd_return_null_tree_v (void)
99 /* Do nothing (return NULL_TREE). */
102 lhd_return_null_tree (tree
ARG_UNUSED (t
))
107 /* Do nothing (return NULL_TREE). */
110 lhd_return_null_const_tree (const_tree
ARG_UNUSED (t
))
115 /* The default post options hook. */
118 lhd_post_options (const char ** ARG_UNUSED (pfilename
))
120 /* Excess precision other than "fast" requires front-end
122 flag_excess_precision_cmdline
= EXCESS_PRECISION_FAST
;
126 /* Called from by print-tree.c. */
129 lhd_print_tree_nothing (FILE * ARG_UNUSED (file
),
130 tree
ARG_UNUSED (node
),
131 int ARG_UNUSED (indent
))
135 /* Called from check_global_declaration. */
138 lhd_warn_unused_global_decl (const_tree decl
)
140 /* This is what used to exist in check_global_declaration. Probably
141 not many of these actually apply to non-C languages. */
143 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_DECLARED_INLINE_P (decl
))
145 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_READONLY (decl
))
147 if (DECL_IN_SYSTEM_HEADER (decl
))
153 /* Set the DECL_ASSEMBLER_NAME for DECL. */
155 lhd_set_decl_assembler_name (tree decl
)
159 /* set_decl_assembler_name may be called on TYPE_DECL to record ODR
160 name for C++ types. By default types have no ODR names. */
161 if (TREE_CODE (decl
) == TYPE_DECL
)
164 /* The language-independent code should never use the
165 DECL_ASSEMBLER_NAME for lots of DECLs. Only FUNCTION_DECLs and
166 VAR_DECLs for variables with static storage duration need a real
167 DECL_ASSEMBLER_NAME. */
168 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
169 || (TREE_CODE (decl
) == VAR_DECL
170 && (TREE_STATIC (decl
)
171 || DECL_EXTERNAL (decl
)
172 || TREE_PUBLIC (decl
))));
174 /* By default, assume the name to use in assembly code is the same
175 as that used in the source language. (That's correct for C, and
176 GCC used to set DECL_ASSEMBLER_NAME to the same value as
177 DECL_NAME in build_decl, so this choice provides backwards
178 compatibility with existing front-ends. This assumption is wrapped
179 in a target hook, to allow for target-specific modification of the
182 Can't use just the variable's own name for a variable whose scope
183 is less than the whole compilation. Concatenate a distinguishing
184 number - we use the DECL_UID. */
186 if (TREE_PUBLIC (decl
) || DECL_FILE_SCOPE_P (decl
))
187 id
= targetm
.mangle_decl_assembler_name (decl
, DECL_NAME (decl
));
190 const char *name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
193 ASM_FORMAT_PRIVATE_NAME (label
, name
, DECL_UID (decl
));
194 id
= get_identifier (label
);
196 SET_DECL_ASSEMBLER_NAME (decl
, id
);
200 /* Type promotion for variable arguments. */
202 lhd_type_promotes_to (tree
ARG_UNUSED (type
))
207 /* Registration of machine- or os-specific builtin types. */
209 lhd_register_builtin_type (tree
ARG_UNUSED (type
),
210 const char * ARG_UNUSED (name
))
214 /* Invalid use of an incomplete type. */
216 lhd_incomplete_type_error (const_tree
ARG_UNUSED (value
), const_tree type
)
218 gcc_assert (TREE_CODE (type
) == ERROR_MARK
);
222 /* Provide a default routine for alias sets that always returns -1. This
223 is used by languages that don't need to do anything special. */
226 lhd_get_alias_set (tree
ARG_UNUSED (t
))
231 /* This is the default decl_printable_name function. */
234 lhd_decl_printable_name (tree decl
, int ARG_UNUSED (verbosity
))
236 gcc_assert (decl
&& DECL_NAME (decl
));
237 return IDENTIFIER_POINTER (DECL_NAME (decl
));
240 /* This is the default dwarf_name function. */
243 lhd_dwarf_name (tree t
, int verbosity
)
245 gcc_assert (DECL_P (t
));
247 return lang_hooks
.decl_printable_name (t
, verbosity
);
250 /* This compares two types for equivalence ("compatible" in C-based languages).
251 This routine should only return 1 if it is sure. It should not be used
252 in contexts where erroneously returning 0 causes problems. */
255 lhd_types_compatible_p (tree x
, tree y
)
257 return TYPE_MAIN_VARIANT (x
) == TYPE_MAIN_VARIANT (y
);
260 /* lang_hooks.tree_dump.dump_tree: Dump language-specific parts of tree
261 nodes. Returns nonzero if it does not want the usual dumping of the
265 lhd_tree_dump_dump_tree (void *di ATTRIBUTE_UNUSED
, tree t ATTRIBUTE_UNUSED
)
270 /* lang_hooks.tree_dump.type_qual: Determine type qualifiers in a
271 language-specific way. */
274 lhd_tree_dump_type_quals (const_tree t
)
276 return TYPE_QUALS (t
);
279 /* lang_hooks.gimplify_expr re-writes *EXPR_P into GIMPLE form. */
282 lhd_gimplify_expr (tree
*expr_p ATTRIBUTE_UNUSED
,
283 gimple_seq
*pre_p ATTRIBUTE_UNUSED
,
284 gimple_seq
*post_p ATTRIBUTE_UNUSED
)
289 /* lang_hooks.tree_size: Determine the size of a tree with code C,
290 which is a language-specific tree code in category tcc_constant or
291 tcc_exceptional. The default expects never to be called. */
293 lhd_tree_size (enum tree_code c ATTRIBUTE_UNUSED
)
298 /* Return true if decl, which is a function decl, may be called by a
302 lhd_decl_ok_for_sibcall (const_tree decl ATTRIBUTE_UNUSED
)
307 /* Generic global declaration processing. This is meant to be called
308 by the front-ends at the end of parsing. C/C++ do their own thing,
309 but other front-ends may call this. */
312 global_decl_processing (void)
314 tree globals
, decl
, *vec
;
317 timevar_stop (TV_PHASE_PARSING
);
318 timevar_start (TV_PHASE_DEFERRED
);
319 /* Really define vars that have had only a tentative definition.
320 Really output inline functions that must actually be callable
321 and have not been output so far. */
323 globals
= lang_hooks
.decls
.getdecls ();
324 len
= list_length (globals
);
325 vec
= XNEWVEC (tree
, len
);
327 /* Process the decls in reverse order--earliest first.
328 Put them into VEC from back to front, then take out from front. */
330 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= DECL_CHAIN (decl
))
331 vec
[len
- i
- 1] = decl
;
333 wrapup_global_declarations (vec
, len
);
334 timevar_stop (TV_PHASE_DEFERRED
);
336 timevar_start (TV_PHASE_PARSING
);
340 /* Called to perform language-specific initialization of CTX. */
342 lhd_initialize_diagnostics (diagnostic_context
*ctx ATTRIBUTE_UNUSED
)
346 /* Called to perform language-specific options initialization. */
348 lhd_init_options (unsigned int decoded_options_count ATTRIBUTE_UNUSED
,
349 struct cl_decoded_option
*decoded_options ATTRIBUTE_UNUSED
)
353 /* By default, always complain about options for the wrong language. */
355 lhd_complain_wrong_lang_p (const struct cl_option
*option ATTRIBUTE_UNUSED
)
360 /* By default, no language-specific options are valid. */
362 lhd_handle_option (size_t code ATTRIBUTE_UNUSED
,
363 const char *arg ATTRIBUTE_UNUSED
,
364 int value ATTRIBUTE_UNUSED
, int kind ATTRIBUTE_UNUSED
,
365 location_t loc ATTRIBUTE_UNUSED
,
366 const struct cl_option_handlers
*handlers ATTRIBUTE_UNUSED
)
371 /* The default function to print out name of current function that caused
374 lhd_print_error_function (diagnostic_context
*context
, const char *file
,
375 diagnostic_info
*diagnostic
)
377 if (diagnostic_last_function_changed (context
, diagnostic
))
379 const char *old_prefix
= context
->printer
->prefix
;
380 tree abstract_origin
= diagnostic_abstract_origin (diagnostic
);
381 char *new_prefix
= (file
&& abstract_origin
== NULL
)
382 ? file_name_as_prefix (context
, file
) : NULL
;
384 pp_set_prefix (context
->printer
, new_prefix
);
386 if (current_function_decl
== NULL
)
387 pp_printf (context
->printer
, _("At top level:"));
394 ao
= BLOCK_ABSTRACT_ORIGIN (abstract_origin
);
395 while (TREE_CODE (ao
) == BLOCK
396 && BLOCK_ABSTRACT_ORIGIN (ao
)
397 && BLOCK_ABSTRACT_ORIGIN (ao
) != ao
)
398 ao
= BLOCK_ABSTRACT_ORIGIN (ao
);
399 gcc_assert (TREE_CODE (ao
) == FUNCTION_DECL
);
403 fndecl
= current_function_decl
;
405 if (TREE_CODE (TREE_TYPE (fndecl
)) == METHOD_TYPE
)
407 (context
->printer
, _("In member function %qs"),
408 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)));
411 (context
->printer
, _("In function %qs"),
412 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)));
414 while (abstract_origin
)
417 tree block
= abstract_origin
;
419 locus
= &BLOCK_SOURCE_LOCATION (block
);
421 block
= BLOCK_SUPERCONTEXT (block
);
422 while (block
&& TREE_CODE (block
) == BLOCK
423 && BLOCK_ABSTRACT_ORIGIN (block
))
425 ao
= BLOCK_ABSTRACT_ORIGIN (block
);
427 while (TREE_CODE (ao
) == BLOCK
428 && BLOCK_ABSTRACT_ORIGIN (ao
)
429 && BLOCK_ABSTRACT_ORIGIN (ao
) != ao
)
430 ao
= BLOCK_ABSTRACT_ORIGIN (ao
);
432 if (TREE_CODE (ao
) == FUNCTION_DECL
)
437 else if (TREE_CODE (ao
) != BLOCK
)
440 block
= BLOCK_SUPERCONTEXT (block
);
443 abstract_origin
= block
;
446 while (block
&& TREE_CODE (block
) == BLOCK
)
447 block
= BLOCK_SUPERCONTEXT (block
);
449 if (block
&& TREE_CODE (block
) == FUNCTION_DECL
)
451 abstract_origin
= NULL
;
455 expanded_location s
= expand_location (*locus
);
456 pp_comma (context
->printer
);
457 pp_newline (context
->printer
);
460 if (context
->show_column
)
461 pp_printf (context
->printer
,
462 _(" inlined from %qs at %r%s:%d:%d%R"),
463 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)),
464 "locus", s
.file
, s
.line
, s
.column
);
466 pp_printf (context
->printer
,
467 _(" inlined from %qs at %r%s:%d%R"),
468 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)),
469 "locus", s
.file
, s
.line
);
473 pp_printf (context
->printer
, _(" inlined from %qs"),
474 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)));
477 pp_colon (context
->printer
);
480 diagnostic_set_last_function (context
, diagnostic
);
481 pp_newline_and_flush (context
->printer
);
482 context
->printer
->prefix
= old_prefix
;
483 free ((char*) new_prefix
);
488 lhd_make_node (enum tree_code code
)
490 return make_node (code
);
494 lhd_to_target_charset (HOST_WIDE_INT c
)
500 lhd_expr_to_decl (tree expr
, bool *tc ATTRIBUTE_UNUSED
, bool *se ATTRIBUTE_UNUSED
)
505 /* Return sharing kind if OpenMP sharing attribute of DECL is
506 predetermined, OMP_CLAUSE_DEFAULT_UNSPECIFIED otherwise. */
508 enum omp_clause_default_kind
509 lhd_omp_predetermined_sharing (tree decl ATTRIBUTE_UNUSED
)
511 if (DECL_ARTIFICIAL (decl
))
512 return OMP_CLAUSE_DEFAULT_SHARED
;
513 return OMP_CLAUSE_DEFAULT_UNSPECIFIED
;
516 /* Generate code to copy SRC to DST. */
519 lhd_omp_assignment (tree clause ATTRIBUTE_UNUSED
, tree dst
, tree src
)
521 return build2 (MODIFY_EXPR
, TREE_TYPE (dst
), dst
, src
);
524 /* Finalize clause C. */
527 lhd_omp_finish_clause (tree
, gimple_seq
*)
531 /* Register language specific type size variables as potentially OpenMP
532 firstprivate variables. */
535 lhd_omp_firstprivatize_type_sizes (struct gimplify_omp_ctx
*c ATTRIBUTE_UNUSED
,
536 tree t ATTRIBUTE_UNUSED
)
540 /* Return true if TYPE is an OpenMP mappable type. */
543 lhd_omp_mappable_type (tree type
)
545 /* Mappable type has to be complete. */
546 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
551 /* Common function for add_builtin_function and
552 add_builtin_function_ext_scope. */
554 add_builtin_function_common (const char *name
,
557 enum built_in_class cl
,
558 const char *library_name
,
562 tree id
= get_identifier (name
);
563 tree decl
= build_decl (BUILTINS_LOCATION
, FUNCTION_DECL
, id
, type
);
565 TREE_PUBLIC (decl
) = 1;
566 DECL_EXTERNAL (decl
) = 1;
567 DECL_BUILT_IN_CLASS (decl
) = cl
;
569 DECL_FUNCTION_CODE (decl
) = (enum built_in_function
) function_code
;
571 /* DECL_FUNCTION_CODE is a bitfield; verify that the value fits. */
572 gcc_assert (DECL_FUNCTION_CODE (decl
) == function_code
);
576 tree libname
= get_identifier (library_name
);
577 SET_DECL_ASSEMBLER_NAME (decl
, libname
);
580 /* Possibly apply some default attributes to this built-in function. */
582 decl_attributes (&decl
, attrs
, ATTR_FLAG_BUILT_IN
);
584 decl_attributes (&decl
, NULL_TREE
, 0);
590 /* Create a builtin function. */
593 add_builtin_function (const char *name
,
596 enum built_in_class cl
,
597 const char *library_name
,
600 return add_builtin_function_common (name
, type
, function_code
, cl
,
602 lang_hooks
.builtin_function
);
605 /* Like add_builtin_function, but make sure the scope is the external scope.
606 This is used to delay putting in back end builtin functions until the ISA
607 that defines the builtin is declared via function specific target options,
608 which can save memory for machines like the x86_64 that have multiple ISAs.
609 If this points to the same function as builtin_function, the backend must
610 add all of the builtins at program initialization time. */
613 add_builtin_function_ext_scope (const char *name
,
616 enum built_in_class cl
,
617 const char *library_name
,
620 return add_builtin_function_common (name
, type
, function_code
, cl
,
622 lang_hooks
.builtin_function_ext_scope
);
626 lhd_builtin_function (tree decl
)
628 lang_hooks
.decls
.pushdecl (decl
);
632 /* Create a builtin type. */
635 add_builtin_type (const char *name
, tree type
)
637 tree id
= get_identifier (name
);
638 tree decl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, id
, type
);
639 return lang_hooks
.decls
.pushdecl (decl
);
644 /* Used to save and restore any previously active section. */
645 static section
*saved_section
;
648 /* Begin a new LTO output section named NAME. This default implementation
649 saves the old section and emits assembly code to switch to the new
653 lhd_begin_section (const char *name
)
657 /* Save the old section so we can restore it in lto_end_asm_section. */
658 gcc_assert (!saved_section
);
659 saved_section
= in_section
;
661 saved_section
= text_section
;
663 /* Create a new section and switch to it. */
664 section
= get_section (name
, SECTION_DEBUG
| SECTION_EXCLUDE
, NULL
);
665 switch_to_section (section
);
669 /* Write DATA of length LEN to the current LTO output section. This default
670 implementation just calls assemble_string. */
673 lhd_append_data (const void *data
, size_t len
, void *)
676 assemble_string ((const char *)data
, len
);
680 /* Finish the current LTO output section. This default implementation emits
681 assembly code to switch to any section previously saved by
682 lhd_begin_section. */
685 lhd_end_section (void)
689 switch_to_section (saved_section
);
690 saved_section
= NULL
;
694 /* Default implementation of enum_underlying_base_type using type_for_size. */
697 lhd_enum_underlying_base_type (const_tree enum_type
)
699 return lang_hooks
.types
.type_for_size (TYPE_PRECISION (enum_type
),
700 TYPE_UNSIGNED (enum_type
));
703 /* Returns true if the current lang_hooks represents the GNU C frontend. */
708 return (strncmp (lang_hooks
.name
, "GNU C", 5) == 0
709 && (lang_hooks
.name
[5] == '\0' || ISDIGIT (lang_hooks
.name
[5])));
712 /* Returns true if the current lang_hooks represents the GNU C++ frontend. */
717 return strncmp (lang_hooks
.name
, "GNU C++", 7) == 0;
720 /* Returns true if the current lang_hooks represents the GNU Fortran frontend. */
723 lang_GNU_Fortran (void)
725 return strncmp (lang_hooks
.name
, "GNU Fortran", 11) == 0;