1 /* Default language-specific hooks.
2 Copyright (C) 2001-2013 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 "tree-inline.h"
31 #include "insn-config.h"
33 #include "langhooks.h"
35 #include "langhooks-def.h"
37 #include "diagnostic.h"
38 #include "tree-diagnostic.h"
43 /* Do nothing; in many cases the default hook. */
50 /* Do nothing (tree). */
53 lhd_do_nothing_t (tree
ARG_UNUSED (t
))
57 /* Pass through (tree). */
59 lhd_pass_through_t (tree t
)
64 /* Do nothing (int, int, int). Return NULL_TREE. */
67 lhd_do_nothing_iii_return_null_tree (int ARG_UNUSED (i
),
74 /* Do nothing (function). */
77 lhd_do_nothing_f (struct function
* ARG_UNUSED (f
))
81 /* Do nothing (return NULL_TREE). */
84 lhd_return_null_tree_v (void)
89 /* Do nothing (return NULL_TREE). */
92 lhd_return_null_tree (tree
ARG_UNUSED (t
))
97 /* Do nothing (return NULL_TREE). */
100 lhd_return_null_const_tree (const_tree
ARG_UNUSED (t
))
106 lhd_do_nothing_u (unsigned ARG_UNUSED (t
))
111 lhd_do_nothing_t_return_int (tree
ARG_UNUSED (t
))
117 lhd_do_nothing_t_return_bool (tree
ARG_UNUSED (t
))
124 lhd_do_nothing_t_t (tree
ARG_UNUSED (t
), tree
ARG_UNUSED (t2
))
129 lhd_do_nothing_t_t_return_int (tree
ARG_UNUSED (t
), tree
ARG_UNUSED (t2
))
135 lhd_do_nothing_t_vp_return_bool (tree
ARG_UNUSED (t
), void * ARG_UNUSED (t2
))
140 /* Do nothing (tree, tree). Return NULL_TREE. */
142 lhd_do_nothing_t_t_return_null_tree (tree
ARG_UNUSED (t
), tree
ARG_UNUSED (t2
))
147 /* The default post options hook. */
150 lhd_post_options (const char ** ARG_UNUSED (pfilename
))
152 /* Excess precision other than "fast" requires front-end
154 flag_excess_precision_cmdline
= EXCESS_PRECISION_FAST
;
158 /* Called from by print-tree.c. */
161 lhd_print_tree_nothing (FILE * ARG_UNUSED (file
),
162 tree
ARG_UNUSED (node
),
163 int ARG_UNUSED (indent
))
167 /* Called from check_global_declarations. */
170 lhd_warn_unused_global_decl (const_tree decl
)
172 /* This is what used to exist in check_global_declarations. Probably
173 not many of these actually apply to non-C languages. */
175 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_DECLARED_INLINE_P (decl
))
177 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_READONLY (decl
))
179 if (DECL_IN_SYSTEM_HEADER (decl
))
185 /* Set the DECL_ASSEMBLER_NAME for DECL. */
187 lhd_set_decl_assembler_name (tree decl
)
191 /* The language-independent code should never use the
192 DECL_ASSEMBLER_NAME for lots of DECLs. Only FUNCTION_DECLs and
193 VAR_DECLs for variables with static storage duration need a real
194 DECL_ASSEMBLER_NAME. */
195 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
196 || (TREE_CODE (decl
) == VAR_DECL
197 && (TREE_STATIC (decl
)
198 || DECL_EXTERNAL (decl
)
199 || TREE_PUBLIC (decl
))));
201 /* By default, assume the name to use in assembly code is the same
202 as that used in the source language. (That's correct for C, and
203 GCC used to set DECL_ASSEMBLER_NAME to the same value as
204 DECL_NAME in build_decl, so this choice provides backwards
205 compatibility with existing front-ends. This assumption is wrapped
206 in a target hook, to allow for target-specific modification of the
209 Can't use just the variable's own name for a variable whose scope
210 is less than the whole compilation. Concatenate a distinguishing
211 number - we use the DECL_UID. */
213 if (TREE_PUBLIC (decl
) || DECL_FILE_SCOPE_P (decl
))
214 id
= targetm
.mangle_decl_assembler_name (decl
, DECL_NAME (decl
));
217 const char *name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
220 ASM_FORMAT_PRIVATE_NAME (label
, name
, DECL_UID (decl
));
221 id
= get_identifier (label
);
223 SET_DECL_ASSEMBLER_NAME (decl
, id
);
227 /* Type promotion for variable arguments. */
229 lhd_type_promotes_to (tree
ARG_UNUSED (type
))
234 /* Registration of machine- or os-specific builtin types. */
236 lhd_register_builtin_type (tree
ARG_UNUSED (type
),
237 const char * ARG_UNUSED (name
))
241 /* Invalid use of an incomplete type. */
243 lhd_incomplete_type_error (const_tree
ARG_UNUSED (value
), const_tree type
)
245 gcc_assert (TREE_CODE (type
) == ERROR_MARK
);
249 /* Provide a default routine for alias sets that always returns -1. This
250 is used by languages that don't need to do anything special. */
253 lhd_get_alias_set (tree
ARG_UNUSED (t
))
258 /* This is the default decl_printable_name function. */
261 lhd_decl_printable_name (tree decl
, int ARG_UNUSED (verbosity
))
263 gcc_assert (decl
&& DECL_NAME (decl
));
264 return IDENTIFIER_POINTER (DECL_NAME (decl
));
267 /* This is the default dwarf_name function. */
270 lhd_dwarf_name (tree t
, int verbosity
)
272 gcc_assert (DECL_P (t
));
274 return lang_hooks
.decl_printable_name (t
, verbosity
);
277 /* This compares two types for equivalence ("compatible" in C-based languages).
278 This routine should only return 1 if it is sure. It should not be used
279 in contexts where erroneously returning 0 causes problems. */
282 lhd_types_compatible_p (tree x
, tree y
)
284 return TYPE_MAIN_VARIANT (x
) == TYPE_MAIN_VARIANT (y
);
287 /* lang_hooks.tree_dump.dump_tree: Dump language-specific parts of tree
288 nodes. Returns nonzero if it does not want the usual dumping of the
292 lhd_tree_dump_dump_tree (void *di ATTRIBUTE_UNUSED
, tree t ATTRIBUTE_UNUSED
)
297 /* lang_hooks.tree_dump.type_qual: Determine type qualifiers in a
298 language-specific way. */
301 lhd_tree_dump_type_quals (const_tree t
)
303 return TYPE_QUALS (t
);
306 /* lang_hooks.gimplify_expr re-writes *EXPR_P into GIMPLE form. */
309 lhd_gimplify_expr (tree
*expr_p ATTRIBUTE_UNUSED
,
310 gimple_seq
*pre_p ATTRIBUTE_UNUSED
,
311 gimple_seq
*post_p ATTRIBUTE_UNUSED
)
316 /* lang_hooks.tree_size: Determine the size of a tree with code C,
317 which is a language-specific tree code in category tcc_constant or
318 tcc_exceptional. The default expects never to be called. */
320 lhd_tree_size (enum tree_code c ATTRIBUTE_UNUSED
)
325 /* Return true if decl, which is a function decl, may be called by a
329 lhd_decl_ok_for_sibcall (const_tree decl ATTRIBUTE_UNUSED
)
334 /* lang_hooks.decls.final_write_globals: perform final processing on
337 write_global_declarations (void)
339 tree globals
, decl
, *vec
;
342 timevar_start (TV_PHASE_DEFERRED
);
343 /* Really define vars that have had only a tentative definition.
344 Really output inline functions that must actually be callable
345 and have not been output so far. */
347 globals
= lang_hooks
.decls
.getdecls ();
348 len
= list_length (globals
);
349 vec
= XNEWVEC (tree
, len
);
351 /* Process the decls in reverse order--earliest first.
352 Put them into VEC from back to front, then take out from front. */
354 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= DECL_CHAIN (decl
))
355 vec
[len
- i
- 1] = decl
;
357 wrapup_global_declarations (vec
, len
);
358 check_global_declarations (vec
, len
);
359 timevar_stop (TV_PHASE_DEFERRED
);
361 timevar_start (TV_PHASE_OPT_GEN
);
362 /* This lang hook is dual-purposed, and also finalizes the
364 finalize_compilation_unit ();
365 timevar_stop (TV_PHASE_OPT_GEN
);
367 timevar_start (TV_PHASE_DBGINFO
);
368 emit_debug_global_declarations (vec
, len
);
369 timevar_stop (TV_PHASE_DBGINFO
);
375 /* Called to perform language-specific initialization of CTX. */
377 lhd_initialize_diagnostics (diagnostic_context
*ctx ATTRIBUTE_UNUSED
)
381 /* Called to perform language-specific options initialization. */
383 lhd_init_options (unsigned int decoded_options_count ATTRIBUTE_UNUSED
,
384 struct cl_decoded_option
*decoded_options ATTRIBUTE_UNUSED
)
388 /* By default, always complain about options for the wrong language. */
390 lhd_complain_wrong_lang_p (const struct cl_option
*option ATTRIBUTE_UNUSED
)
395 /* By default, no language-specific options are valid. */
397 lhd_handle_option (size_t code ATTRIBUTE_UNUSED
,
398 const char *arg ATTRIBUTE_UNUSED
,
399 int value ATTRIBUTE_UNUSED
, int kind ATTRIBUTE_UNUSED
,
400 location_t loc ATTRIBUTE_UNUSED
,
401 const struct cl_option_handlers
*handlers ATTRIBUTE_UNUSED
)
406 /* The default function to print out name of current function that caused
409 lhd_print_error_function (diagnostic_context
*context
, const char *file
,
410 diagnostic_info
*diagnostic
)
412 if (diagnostic_last_function_changed (context
, diagnostic
))
414 const char *old_prefix
= context
->printer
->prefix
;
415 tree abstract_origin
= diagnostic_abstract_origin (diagnostic
);
416 char *new_prefix
= (file
&& abstract_origin
== NULL
)
417 ? file_name_as_prefix (file
) : NULL
;
419 pp_set_prefix (context
->printer
, new_prefix
);
421 if (current_function_decl
== NULL
)
422 pp_printf (context
->printer
, _("At top level:"));
429 ao
= BLOCK_ABSTRACT_ORIGIN (abstract_origin
);
430 while (TREE_CODE (ao
) == BLOCK
431 && BLOCK_ABSTRACT_ORIGIN (ao
)
432 && BLOCK_ABSTRACT_ORIGIN (ao
) != ao
)
433 ao
= BLOCK_ABSTRACT_ORIGIN (ao
);
434 gcc_assert (TREE_CODE (ao
) == FUNCTION_DECL
);
438 fndecl
= current_function_decl
;
440 if (TREE_CODE (TREE_TYPE (fndecl
)) == METHOD_TYPE
)
442 (context
->printer
, _("In member function %qs"),
443 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)));
446 (context
->printer
, _("In function %qs"),
447 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)));
449 while (abstract_origin
)
452 tree block
= abstract_origin
;
454 locus
= &BLOCK_SOURCE_LOCATION (block
);
456 block
= BLOCK_SUPERCONTEXT (block
);
457 while (block
&& TREE_CODE (block
) == BLOCK
458 && BLOCK_ABSTRACT_ORIGIN (block
))
460 ao
= BLOCK_ABSTRACT_ORIGIN (block
);
462 while (TREE_CODE (ao
) == BLOCK
463 && BLOCK_ABSTRACT_ORIGIN (ao
)
464 && BLOCK_ABSTRACT_ORIGIN (ao
) != ao
)
465 ao
= BLOCK_ABSTRACT_ORIGIN (ao
);
467 if (TREE_CODE (ao
) == FUNCTION_DECL
)
472 else if (TREE_CODE (ao
) != BLOCK
)
475 block
= BLOCK_SUPERCONTEXT (block
);
478 abstract_origin
= block
;
481 while (block
&& TREE_CODE (block
) == BLOCK
)
482 block
= BLOCK_SUPERCONTEXT (block
);
484 if (block
&& TREE_CODE (block
) == FUNCTION_DECL
)
486 abstract_origin
= NULL
;
490 expanded_location s
= expand_location (*locus
);
491 pp_character (context
->printer
, ',');
492 pp_newline (context
->printer
);
495 if (context
->show_column
)
496 pp_printf (context
->printer
,
497 _(" inlined from %qs at %s:%d:%d"),
498 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)),
499 s
.file
, s
.line
, s
.column
);
501 pp_printf (context
->printer
,
502 _(" inlined from %qs at %s:%d"),
503 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)),
508 pp_printf (context
->printer
, _(" inlined from %qs"),
509 identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 2)));
512 pp_character (context
->printer
, ':');
515 diagnostic_set_last_function (context
, diagnostic
);
516 pp_newline_and_flush (context
->printer
);
517 context
->printer
->prefix
= old_prefix
;
518 free ((char*) new_prefix
);
523 lhd_make_node (enum tree_code code
)
525 return make_node (code
);
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 /* Register language specific type size variables as potentially OpenMP
560 firstprivate variables. */
563 lhd_omp_firstprivatize_type_sizes (struct gimplify_omp_ctx
*c ATTRIBUTE_UNUSED
,
564 tree t ATTRIBUTE_UNUSED
)
568 /* Common function for add_builtin_function and
569 add_builtin_function_ext_scope. */
571 add_builtin_function_common (const char *name
,
574 enum built_in_class cl
,
575 const char *library_name
,
579 tree id
= get_identifier (name
);
580 tree decl
= build_decl (BUILTINS_LOCATION
, FUNCTION_DECL
, id
, type
);
582 TREE_PUBLIC (decl
) = 1;
583 DECL_EXTERNAL (decl
) = 1;
584 DECL_BUILT_IN_CLASS (decl
) = cl
;
586 DECL_FUNCTION_CODE (decl
) = (enum built_in_function
) function_code
;
588 /* DECL_FUNCTION_CODE is a bitfield; verify that the value fits. */
589 gcc_assert (DECL_FUNCTION_CODE (decl
) == function_code
);
593 tree libname
= get_identifier (library_name
);
594 SET_DECL_ASSEMBLER_NAME (decl
, libname
);
597 /* Possibly apply some default attributes to this built-in function. */
599 decl_attributes (&decl
, attrs
, ATTR_FLAG_BUILT_IN
);
601 decl_attributes (&decl
, NULL_TREE
, 0);
607 /* Create a builtin function. */
610 add_builtin_function (const char *name
,
613 enum built_in_class cl
,
614 const char *library_name
,
617 return add_builtin_function_common (name
, type
, function_code
, cl
,
619 lang_hooks
.builtin_function
);
622 /* Like add_builtin_function, but make sure the scope is the external scope.
623 This is used to delay putting in back end builtin functions until the ISA
624 that defines the builtin is declared via function specific target options,
625 which can save memory for machines like the x86_64 that have multiple ISAs.
626 If this points to the same function as builtin_function, the backend must
627 add all of the builtins at program initialization time. */
630 add_builtin_function_ext_scope (const char *name
,
633 enum built_in_class cl
,
634 const char *library_name
,
637 return add_builtin_function_common (name
, type
, function_code
, cl
,
639 lang_hooks
.builtin_function_ext_scope
);
643 lhd_builtin_function (tree decl
)
645 lang_hooks
.decls
.pushdecl (decl
);
650 lhd_user_conv_function_p (tree decl ATTRIBUTE_UNUSED
)
655 /* Create a builtin type. */
658 add_builtin_type (const char *name
, tree type
)
660 tree id
= get_identifier (name
);
661 tree decl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, id
, type
);
662 return lang_hooks
.decls
.pushdecl (decl
);
667 /* Used to save and restore any previously active section. */
668 static section
*saved_section
;
671 /* Begin a new LTO output section named NAME. This default implementation
672 saves the old section and emits assembly code to switch to the new
676 lhd_begin_section (const char *name
)
680 /* Save the old section so we can restore it in lto_end_asm_section. */
681 gcc_assert (!saved_section
);
682 saved_section
= in_section
;
684 saved_section
= text_section
;
686 /* Create a new section and switch to it. */
687 section
= get_section (name
, SECTION_DEBUG
, NULL
);
688 switch_to_section (section
);
692 /* Write DATA of length LEN to the current LTO output section. This default
693 implementation just calls assemble_string and frees BLOCK. */
696 lhd_append_data (const void *data
, size_t len
, void *block
)
699 assemble_string ((const char *)data
, len
);
704 /* Finish the current LTO output section. This default implementation emits
705 assembly code to switch to any section previously saved by
706 lhd_begin_section. */
709 lhd_end_section (void)
713 switch_to_section (saved_section
);
714 saved_section
= NULL
;