1 /* Default language-specific hooks.
2 Copyright (C) 2001-2014 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"
30 #include "tree-inline.h"
33 #include "insn-config.h"
35 #include "langhooks.h"
37 #include "langhooks-def.h"
38 #include "diagnostic.h"
39 #include "tree-diagnostic.h"
44 /* Do nothing; in many cases the default hook. */
51 /* Do nothing (bool). */
54 lhd_do_nothing_b (bool ARG_UNUSED (b
))
58 /* Do nothing (tree). */
61 lhd_do_nothing_t (tree
ARG_UNUSED (t
))
65 /* Do nothing (tree, tree). */
68 lhd_do_nothing_t_t (tree
ARG_UNUSED (a
),
73 /* Pass through (tree). */
75 lhd_pass_through_t (tree t
)
80 /* Do nothing (int, int, int). Return NULL_TREE. */
83 lhd_do_nothing_iii_return_null_tree (int ARG_UNUSED (i
),
90 /* Do nothing (function). */
93 lhd_do_nothing_f (struct function
* ARG_UNUSED (f
))
97 /* Do nothing (return NULL_TREE). */
100 lhd_return_null_tree_v (void)
105 /* Do nothing (return NULL_TREE). */
108 lhd_return_null_tree (tree
ARG_UNUSED (t
))
113 /* Do nothing (return NULL_TREE). */
116 lhd_return_null_const_tree (const_tree
ARG_UNUSED (t
))
121 /* The default post options hook. */
124 lhd_post_options (const char ** ARG_UNUSED (pfilename
))
126 /* Excess precision other than "fast" requires front-end
128 flag_excess_precision_cmdline
= EXCESS_PRECISION_FAST
;
132 /* Called from by print-tree.c. */
135 lhd_print_tree_nothing (FILE * ARG_UNUSED (file
),
136 tree
ARG_UNUSED (node
),
137 int ARG_UNUSED (indent
))
141 /* Called from check_global_declarations. */
144 lhd_warn_unused_global_decl (const_tree decl
)
146 /* This is what used to exist in check_global_declarations. Probably
147 not many of these actually apply to non-C languages. */
149 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_DECLARED_INLINE_P (decl
))
151 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_READONLY (decl
))
153 if (DECL_IN_SYSTEM_HEADER (decl
))
159 /* Set the DECL_ASSEMBLER_NAME for DECL. */
161 lhd_set_decl_assembler_name (tree decl
)
165 /* The language-independent code should never use the
166 DECL_ASSEMBLER_NAME for lots of DECLs. Only FUNCTION_DECLs and
167 VAR_DECLs for variables with static storage duration need a real
168 DECL_ASSEMBLER_NAME. */
169 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
170 || (TREE_CODE (decl
) == VAR_DECL
171 && (TREE_STATIC (decl
)
172 || DECL_EXTERNAL (decl
)
173 || TREE_PUBLIC (decl
))));
175 /* By default, assume the name to use in assembly code is the same
176 as that used in the source language. (That's correct for C, and
177 GCC used to set DECL_ASSEMBLER_NAME to the same value as
178 DECL_NAME in build_decl, so this choice provides backwards
179 compatibility with existing front-ends. This assumption is wrapped
180 in a target hook, to allow for target-specific modification of the
183 Can't use just the variable's own name for a variable whose scope
184 is less than the whole compilation. Concatenate a distinguishing
185 number - we use the DECL_UID. */
187 if (TREE_PUBLIC (decl
) || DECL_FILE_SCOPE_P (decl
))
188 id
= targetm
.mangle_decl_assembler_name (decl
, DECL_NAME (decl
));
191 const char *name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
194 ASM_FORMAT_PRIVATE_NAME (label
, name
, DECL_UID (decl
));
195 id
= get_identifier (label
);
197 SET_DECL_ASSEMBLER_NAME (decl
, id
);
201 /* Type promotion for variable arguments. */
203 lhd_type_promotes_to (tree
ARG_UNUSED (type
))
208 /* Registration of machine- or os-specific builtin types. */
210 lhd_register_builtin_type (tree
ARG_UNUSED (type
),
211 const char * ARG_UNUSED (name
))
215 /* Invalid use of an incomplete type. */
217 lhd_incomplete_type_error (const_tree
ARG_UNUSED (value
), const_tree type
)
219 gcc_assert (TREE_CODE (type
) == ERROR_MARK
);
223 /* Provide a default routine for alias sets that always returns -1. This
224 is used by languages that don't need to do anything special. */
227 lhd_get_alias_set (tree
ARG_UNUSED (t
))
232 /* This is the default decl_printable_name function. */
235 lhd_decl_printable_name (tree decl
, int ARG_UNUSED (verbosity
))
237 gcc_assert (decl
&& DECL_NAME (decl
));
238 return IDENTIFIER_POINTER (DECL_NAME (decl
));
241 /* This is the default dwarf_name function. */
244 lhd_dwarf_name (tree t
, int verbosity
)
246 gcc_assert (DECL_P (t
));
248 return lang_hooks
.decl_printable_name (t
, verbosity
);
251 /* This compares two types for equivalence ("compatible" in C-based languages).
252 This routine should only return 1 if it is sure. It should not be used
253 in contexts where erroneously returning 0 causes problems. */
256 lhd_types_compatible_p (tree x
, tree y
)
258 return TYPE_MAIN_VARIANT (x
) == TYPE_MAIN_VARIANT (y
);
261 /* lang_hooks.tree_dump.dump_tree: Dump language-specific parts of tree
262 nodes. Returns nonzero if it does not want the usual dumping of the
266 lhd_tree_dump_dump_tree (void *di ATTRIBUTE_UNUSED
, tree t ATTRIBUTE_UNUSED
)
271 /* lang_hooks.tree_dump.type_qual: Determine type qualifiers in a
272 language-specific way. */
275 lhd_tree_dump_type_quals (const_tree t
)
277 return TYPE_QUALS (t
);
280 /* lang_hooks.gimplify_expr re-writes *EXPR_P into GIMPLE form. */
283 lhd_gimplify_expr (tree
*expr_p ATTRIBUTE_UNUSED
,
284 gimple_seq
*pre_p ATTRIBUTE_UNUSED
,
285 gimple_seq
*post_p ATTRIBUTE_UNUSED
)
290 /* lang_hooks.tree_size: Determine the size of a tree with code C,
291 which is a language-specific tree code in category tcc_constant or
292 tcc_exceptional. The default expects never to be called. */
294 lhd_tree_size (enum tree_code c ATTRIBUTE_UNUSED
)
299 /* Return true if decl, which is a function decl, may be called by a
303 lhd_decl_ok_for_sibcall (const_tree decl ATTRIBUTE_UNUSED
)
308 /* lang_hooks.decls.final_write_globals: perform final processing on
311 write_global_declarations (void)
313 tree globals
, decl
, *vec
;
316 timevar_start (TV_PHASE_DEFERRED
);
317 /* Really define vars that have had only a tentative definition.
318 Really output inline functions that must actually be callable
319 and have not been output so far. */
321 globals
= lang_hooks
.decls
.getdecls ();
322 len
= list_length (globals
);
323 vec
= XNEWVEC (tree
, len
);
325 /* Process the decls in reverse order--earliest first.
326 Put them into VEC from back to front, then take out from front. */
328 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= DECL_CHAIN (decl
))
329 vec
[len
- i
- 1] = decl
;
331 wrapup_global_declarations (vec
, len
);
332 check_global_declarations (vec
, len
);
333 timevar_stop (TV_PHASE_DEFERRED
);
335 timevar_start (TV_PHASE_OPT_GEN
);
336 /* This lang hook is dual-purposed, and also finalizes the
338 finalize_compilation_unit ();
339 timevar_stop (TV_PHASE_OPT_GEN
);
341 timevar_start (TV_PHASE_DBGINFO
);
342 emit_debug_global_declarations (vec
, len
);
343 timevar_stop (TV_PHASE_DBGINFO
);
349 /* Called to perform language-specific initialization of CTX. */
351 lhd_initialize_diagnostics (diagnostic_context
*ctx ATTRIBUTE_UNUSED
)
355 /* Called to perform language-specific options initialization. */
357 lhd_init_options (unsigned int decoded_options_count ATTRIBUTE_UNUSED
,
358 struct cl_decoded_option
*decoded_options ATTRIBUTE_UNUSED
)
362 /* By default, always complain about options for the wrong language. */
364 lhd_complain_wrong_lang_p (const struct cl_option
*option ATTRIBUTE_UNUSED
)
369 /* By default, no language-specific options are valid. */
371 lhd_handle_option (size_t code ATTRIBUTE_UNUSED
,
372 const char *arg ATTRIBUTE_UNUSED
,
373 int value ATTRIBUTE_UNUSED
, int kind ATTRIBUTE_UNUSED
,
374 location_t loc ATTRIBUTE_UNUSED
,
375 const struct cl_option_handlers
*handlers ATTRIBUTE_UNUSED
)
380 /* The default function to print out name of current function that caused
383 lhd_print_error_function (diagnostic_context
*context
, const char *file
,
384 diagnostic_info
*diagnostic
)
386 if (diagnostic_last_function_changed (context
, diagnostic
))
388 const char *old_prefix
= context
->printer
->prefix
;
389 tree abstract_origin
= diagnostic_abstract_origin (diagnostic
);
390 char *new_prefix
= (file
&& abstract_origin
== NULL
)
391 ? file_name_as_prefix (context
, file
) : NULL
;
393 pp_set_prefix (context
->printer
, new_prefix
);
395 if (current_function_decl
== NULL
)
396 pp_printf (context
->printer
, _("At top level:"));
403 ao
= BLOCK_ABSTRACT_ORIGIN (abstract_origin
);
404 while (TREE_CODE (ao
) == BLOCK
405 && BLOCK_ABSTRACT_ORIGIN (ao
)
406 && BLOCK_ABSTRACT_ORIGIN (ao
) != ao
)
407 ao
= BLOCK_ABSTRACT_ORIGIN (ao
);
408 gcc_assert (TREE_CODE (ao
) == FUNCTION_DECL
);
412 fndecl
= current_function_decl
;
414 if (TREE_CODE (TREE_TYPE (fndecl
)) == METHOD_TYPE
)
416 (context
->printer
, _("In member function %qs"),
417 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)));
420 (context
->printer
, _("In function %qs"),
421 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)));
423 while (abstract_origin
)
426 tree block
= abstract_origin
;
428 locus
= &BLOCK_SOURCE_LOCATION (block
);
430 block
= BLOCK_SUPERCONTEXT (block
);
431 while (block
&& TREE_CODE (block
) == BLOCK
432 && BLOCK_ABSTRACT_ORIGIN (block
))
434 ao
= BLOCK_ABSTRACT_ORIGIN (block
);
436 while (TREE_CODE (ao
) == BLOCK
437 && BLOCK_ABSTRACT_ORIGIN (ao
)
438 && BLOCK_ABSTRACT_ORIGIN (ao
) != ao
)
439 ao
= BLOCK_ABSTRACT_ORIGIN (ao
);
441 if (TREE_CODE (ao
) == FUNCTION_DECL
)
446 else if (TREE_CODE (ao
) != BLOCK
)
449 block
= BLOCK_SUPERCONTEXT (block
);
452 abstract_origin
= block
;
455 while (block
&& TREE_CODE (block
) == BLOCK
)
456 block
= BLOCK_SUPERCONTEXT (block
);
458 if (block
&& TREE_CODE (block
) == FUNCTION_DECL
)
460 abstract_origin
= NULL
;
464 expanded_location s
= expand_location (*locus
);
465 pp_comma (context
->printer
);
466 pp_newline (context
->printer
);
469 if (context
->show_column
)
470 pp_printf (context
->printer
,
471 _(" inlined from %qs at %r%s:%d:%d%R"),
472 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)),
473 "locus", s
.file
, s
.line
, s
.column
);
475 pp_printf (context
->printer
,
476 _(" inlined from %qs at %r%s:%d%R"),
477 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)),
478 "locus", s
.file
, s
.line
);
482 pp_printf (context
->printer
, _(" inlined from %qs"),
483 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)));
486 pp_colon (context
->printer
);
489 diagnostic_set_last_function (context
, diagnostic
);
490 pp_newline_and_flush (context
->printer
);
491 context
->printer
->prefix
= old_prefix
;
492 free ((char*) new_prefix
);
497 lhd_make_node (enum tree_code code
)
499 return make_node (code
);
503 lhd_to_target_charset (HOST_WIDE_INT c
)
509 lhd_expr_to_decl (tree expr
, bool *tc ATTRIBUTE_UNUSED
, bool *se ATTRIBUTE_UNUSED
)
514 /* Return sharing kind if OpenMP sharing attribute of DECL is
515 predetermined, OMP_CLAUSE_DEFAULT_UNSPECIFIED otherwise. */
517 enum omp_clause_default_kind
518 lhd_omp_predetermined_sharing (tree decl ATTRIBUTE_UNUSED
)
520 if (DECL_ARTIFICIAL (decl
))
521 return OMP_CLAUSE_DEFAULT_SHARED
;
522 return OMP_CLAUSE_DEFAULT_UNSPECIFIED
;
525 /* Generate code to copy SRC to DST. */
528 lhd_omp_assignment (tree clause ATTRIBUTE_UNUSED
, tree dst
, tree src
)
530 return build2 (MODIFY_EXPR
, TREE_TYPE (dst
), dst
, src
);
533 /* Register language specific type size variables as potentially OpenMP
534 firstprivate variables. */
537 lhd_omp_firstprivatize_type_sizes (struct gimplify_omp_ctx
*c ATTRIBUTE_UNUSED
,
538 tree t ATTRIBUTE_UNUSED
)
542 /* Return true if TYPE is an OpenMP mappable type. */
545 lhd_omp_mappable_type (tree type
)
547 /* Mappable type has to be complete. */
548 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
553 /* Common function for add_builtin_function and
554 add_builtin_function_ext_scope. */
556 add_builtin_function_common (const char *name
,
559 enum built_in_class cl
,
560 const char *library_name
,
564 tree id
= get_identifier (name
);
565 tree decl
= build_decl (BUILTINS_LOCATION
, FUNCTION_DECL
, id
, type
);
567 TREE_PUBLIC (decl
) = 1;
568 DECL_EXTERNAL (decl
) = 1;
569 DECL_BUILT_IN_CLASS (decl
) = cl
;
571 DECL_FUNCTION_CODE (decl
) = (enum built_in_function
) function_code
;
573 /* DECL_FUNCTION_CODE is a bitfield; verify that the value fits. */
574 gcc_assert (DECL_FUNCTION_CODE (decl
) == function_code
);
578 tree libname
= get_identifier (library_name
);
579 SET_DECL_ASSEMBLER_NAME (decl
, libname
);
582 /* Possibly apply some default attributes to this built-in function. */
584 decl_attributes (&decl
, attrs
, ATTR_FLAG_BUILT_IN
);
586 decl_attributes (&decl
, NULL_TREE
, 0);
592 /* Create a builtin function. */
595 add_builtin_function (const char *name
,
598 enum built_in_class cl
,
599 const char *library_name
,
602 return add_builtin_function_common (name
, type
, function_code
, cl
,
604 lang_hooks
.builtin_function
);
607 /* Like add_builtin_function, but make sure the scope is the external scope.
608 This is used to delay putting in back end builtin functions until the ISA
609 that defines the builtin is declared via function specific target options,
610 which can save memory for machines like the x86_64 that have multiple ISAs.
611 If this points to the same function as builtin_function, the backend must
612 add all of the builtins at program initialization time. */
615 add_builtin_function_ext_scope (const char *name
,
618 enum built_in_class cl
,
619 const char *library_name
,
622 return add_builtin_function_common (name
, type
, function_code
, cl
,
624 lang_hooks
.builtin_function_ext_scope
);
628 lhd_builtin_function (tree decl
)
630 lang_hooks
.decls
.pushdecl (decl
);
634 /* Create a builtin type. */
637 add_builtin_type (const char *name
, tree type
)
639 tree id
= get_identifier (name
);
640 tree decl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, id
, type
);
641 return lang_hooks
.decls
.pushdecl (decl
);
646 /* Used to save and restore any previously active section. */
647 static section
*saved_section
;
650 /* Begin a new LTO output section named NAME. This default implementation
651 saves the old section and emits assembly code to switch to the new
655 lhd_begin_section (const char *name
)
659 /* Save the old section so we can restore it in lto_end_asm_section. */
660 gcc_assert (!saved_section
);
661 saved_section
= in_section
;
663 saved_section
= text_section
;
665 /* Create a new section and switch to it. */
666 section
= get_section (name
, SECTION_DEBUG
, NULL
);
667 switch_to_section (section
);
671 /* Write DATA of length LEN to the current LTO output section. This default
672 implementation just calls assemble_string and frees BLOCK. */
675 lhd_append_data (const void *data
, size_t len
, void *block
)
678 assemble_string ((const char *)data
, len
);
683 /* Finish the current LTO output section. This default implementation emits
684 assembly code to switch to any section previously saved by
685 lhd_begin_section. */
688 lhd_end_section (void)
692 switch_to_section (saved_section
);
693 saved_section
= NULL
;
697 /* Default implementation of enum_underlying_base_type using type_for_size. */
700 lhd_enum_underlying_base_type (const_tree enum_type
)
702 return lang_hooks
.types
.type_for_size (TYPE_PRECISION (enum_type
),
703 TYPE_UNSIGNED (enum_type
));