1 /* Default language-specific hooks.
2 Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
3 Free Software Foundation, Inc.
4 Contributed by Alexandre Oliva <aoliva@redhat.com>
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
24 #include "coretypes.h"
29 #include "tree-inline.h"
32 #include "insn-config.h"
33 #include "integrate.h"
35 #include "langhooks.h"
37 #include "langhooks-def.h"
39 #include "diagnostic.h"
40 #include "tree-diagnostic.h"
44 /* Do nothing; in many cases the default hook. */
51 /* Do nothing (tree). */
54 lhd_do_nothing_t (tree ARG_UNUSED (t))
58 /* Pass through (tree). */
60 lhd_pass_through_t (tree t)
65 /* Do nothing (int). */
68 lhd_do_nothing_i (int ARG_UNUSED (i))
72 /* Do nothing (int, int, int). Return NULL_TREE. */
75 lhd_do_nothing_iii_return_null_tree (int ARG_UNUSED (i),
82 /* Do nothing (function). */
85 lhd_do_nothing_f (struct function * ARG_UNUSED (f))
89 /* Do nothing (return NULL_TREE). */
92 lhd_return_null_tree_v (void)
97 /* Do nothing (return NULL_TREE). */
100 lhd_return_null_tree (tree ARG_UNUSED (t))
105 /* Do nothing (return NULL_TREE). */
108 lhd_return_null_const_tree (const_tree ARG_UNUSED (t))
113 /* The default post options hook. */
116 lhd_post_options (const char ** ARG_UNUSED (pfilename))
118 /* Excess precision other than "fast" requires front-end
120 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
124 /* Called from by print-tree.c. */
127 lhd_print_tree_nothing (FILE * ARG_UNUSED (file),
128 tree ARG_UNUSED (node),
129 int ARG_UNUSED (indent))
133 /* Called from check_global_declarations. */
136 lhd_warn_unused_global_decl (const_tree decl)
138 /* This is what used to exist in check_global_declarations. Probably
139 not many of these actually apply to non-C languages. */
141 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl))
143 if (TREE_CODE (decl) == VAR_DECL && TREE_READONLY (decl))
145 if (DECL_IN_SYSTEM_HEADER (decl))
151 /* Set the DECL_ASSEMBLER_NAME for DECL. */
153 lhd_set_decl_assembler_name (tree decl)
157 /* The language-independent code should never use the
158 DECL_ASSEMBLER_NAME for lots of DECLs. Only FUNCTION_DECLs and
159 VAR_DECLs for variables with static storage duration need a real
160 DECL_ASSEMBLER_NAME. */
161 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
162 || (TREE_CODE (decl) == VAR_DECL
163 && (TREE_STATIC (decl)
164 || DECL_EXTERNAL (decl)
165 || TREE_PUBLIC (decl))));
167 /* By default, assume the name to use in assembly code is the same
168 as that used in the source language. (That's correct for C, and
169 GCC used to set DECL_ASSEMBLER_NAME to the same value as
170 DECL_NAME in build_decl, so this choice provides backwards
171 compatibility with existing front-ends. This assumption is wrapped
172 in a target hook, to allow for target-specific modification of the
175 Can't use just the variable's own name for a variable whose scope
176 is less than the whole compilation. Concatenate a distinguishing
177 number - we use the DECL_UID. */
179 if (TREE_PUBLIC (decl) || DECL_FILE_SCOPE_P (decl))
180 id = targetm.mangle_decl_assembler_name (decl, DECL_NAME (decl));
183 const char *name = IDENTIFIER_POINTER (DECL_NAME (decl));
186 ASM_FORMAT_PRIVATE_NAME (label, name, DECL_UID (decl));
187 id = get_identifier (label);
189 SET_DECL_ASSEMBLER_NAME (decl, id);
193 /* Type promotion for variable arguments. */
195 lhd_type_promotes_to (tree ARG_UNUSED (type))
200 /* Registration of machine- or os-specific builtin types. */
202 lhd_register_builtin_type (tree ARG_UNUSED (type),
203 const char * ARG_UNUSED (name))
207 /* Invalid use of an incomplete type. */
209 lhd_incomplete_type_error (const_tree ARG_UNUSED (value), const_tree type)
211 gcc_assert (TREE_CODE (type) == ERROR_MARK);
215 /* Provide a default routine for alias sets that always returns -1. This
216 is used by languages that don't need to do anything special. */
219 lhd_get_alias_set (tree ARG_UNUSED (t))
224 /* This is the default decl_printable_name function. */
227 lhd_decl_printable_name (tree decl, int ARG_UNUSED (verbosity))
229 gcc_assert (decl && DECL_NAME (decl));
230 return IDENTIFIER_POINTER (DECL_NAME (decl));
233 /* This is the default dwarf_name function. */
236 lhd_dwarf_name (tree t, int verbosity)
238 gcc_assert (DECL_P (t));
240 return lang_hooks.decl_printable_name (t, verbosity);
243 /* This compares two types for equivalence ("compatible" in C-based languages).
244 This routine should only return 1 if it is sure. It should not be used
245 in contexts where erroneously returning 0 causes problems. */
248 lhd_types_compatible_p (tree x, tree y)
250 return TYPE_MAIN_VARIANT (x) == TYPE_MAIN_VARIANT (y);
253 /* lang_hooks.tree_dump.dump_tree: Dump language-specific parts of tree
254 nodes. Returns nonzero if it does not want the usual dumping of the
258 lhd_tree_dump_dump_tree (void *di ATTRIBUTE_UNUSED, tree t ATTRIBUTE_UNUSED)
263 /* lang_hooks.tree_dump.type_qual: Determine type qualifiers in a
264 language-specific way. */
267 lhd_tree_dump_type_quals (const_tree t)
269 return TYPE_QUALS (t);
272 /* lang_hooks.gimplify_expr re-writes *EXPR_P into GIMPLE form. */
275 lhd_gimplify_expr (tree *expr_p ATTRIBUTE_UNUSED,
276 gimple_seq *pre_p ATTRIBUTE_UNUSED,
277 gimple_seq *post_p ATTRIBUTE_UNUSED)
282 /* lang_hooks.tree_size: Determine the size of a tree with code C,
283 which is a language-specific tree code in category tcc_constant or
284 tcc_exceptional. The default expects never to be called. */
286 lhd_tree_size (enum tree_code c ATTRIBUTE_UNUSED)
291 /* Return true if decl, which is a function decl, may be called by a
295 lhd_decl_ok_for_sibcall (const_tree decl ATTRIBUTE_UNUSED)
300 /* lang_hooks.decls.final_write_globals: perform final processing on
303 write_global_declarations (void)
305 tree globals, decl, *vec;
308 /* This lang hook is dual-purposed, and also finalizes the
310 cgraph_finalize_compilation_unit ();
312 /* Really define vars that have had only a tentative definition.
313 Really output inline functions that must actually be callable
314 and have not been output so far. */
316 globals = lang_hooks.decls.getdecls ();
317 len = list_length (globals);
318 vec = XNEWVEC (tree, len);
320 /* Process the decls in reverse order--earliest first.
321 Put them into VEC from back to front, then take out from front. */
323 for (i = 0, decl = globals; i < len; i++, decl = DECL_CHAIN (decl))
324 vec[len - i - 1] = decl;
326 wrapup_global_declarations (vec, len);
327 check_global_declarations (vec, len);
328 emit_debug_global_declarations (vec, len);
334 /* Called to perform language-specific initialization of CTX. */
336 lhd_initialize_diagnostics (diagnostic_context *ctx ATTRIBUTE_UNUSED)
340 /* Called to perform language-specific options initialization of OPTS. */
342 lhd_init_options_struct (struct gcc_options *opts 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 const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
370 /* The default function to print out name of current function that caused
373 lhd_print_error_function (diagnostic_context *context, const char *file,
374 diagnostic_info *diagnostic)
376 if (diagnostic_last_function_changed (context, diagnostic))
378 const char *old_prefix = context->printer->prefix;
379 tree abstract_origin = diagnostic_abstract_origin (diagnostic);
380 char *new_prefix = (file && abstract_origin == NULL)
381 ? file_name_as_prefix (file) : NULL;
383 pp_set_prefix (context->printer, new_prefix);
385 if (current_function_decl == NULL)
386 pp_printf (context->printer, _("At top level:"));
393 ao = BLOCK_ABSTRACT_ORIGIN (abstract_origin);
394 while (TREE_CODE (ao) == BLOCK
395 && BLOCK_ABSTRACT_ORIGIN (ao)
396 && BLOCK_ABSTRACT_ORIGIN (ao) != ao)
397 ao = BLOCK_ABSTRACT_ORIGIN (ao);
398 gcc_assert (TREE_CODE (ao) == FUNCTION_DECL);
402 fndecl = current_function_decl;
404 if (TREE_CODE (TREE_TYPE (fndecl)) == METHOD_TYPE)
406 (context->printer, _("In member function %qs"),
407 identifier_to_locale (lang_hooks.decl_printable_name (fndecl, 2)));
410 (context->printer, _("In function %qs"),
411 identifier_to_locale (lang_hooks.decl_printable_name (fndecl, 2)));
413 while (abstract_origin)
416 tree block = abstract_origin;
418 locus = &BLOCK_SOURCE_LOCATION (block);
420 block = BLOCK_SUPERCONTEXT (block);
421 while (block && TREE_CODE (block) == BLOCK
422 && BLOCK_ABSTRACT_ORIGIN (block))
424 ao = BLOCK_ABSTRACT_ORIGIN (block);
426 while (TREE_CODE (ao) == BLOCK
427 && BLOCK_ABSTRACT_ORIGIN (ao)
428 && BLOCK_ABSTRACT_ORIGIN (ao) != ao)
429 ao = BLOCK_ABSTRACT_ORIGIN (ao);
431 if (TREE_CODE (ao) == FUNCTION_DECL)
436 else if (TREE_CODE (ao) != BLOCK)
439 block = BLOCK_SUPERCONTEXT (block);
442 abstract_origin = block;
445 while (block && TREE_CODE (block) == BLOCK)
446 block = BLOCK_SUPERCONTEXT (block);
448 if (block && TREE_CODE (block) == FUNCTION_DECL)
450 abstract_origin = NULL;
454 expanded_location s = expand_location (*locus);
455 pp_character (context->printer, ',');
456 pp_newline (context->printer);
459 if (context->show_column)
460 pp_printf (context->printer,
461 _(" inlined from %qs at %s:%d:%d"),
462 identifier_to_locale (lang_hooks.decl_printable_name (fndecl, 2)),
463 s.file, s.line, s.column);
465 pp_printf (context->printer,
466 _(" inlined from %qs at %s:%d"),
467 identifier_to_locale (lang_hooks.decl_printable_name (fndecl, 2)),
472 pp_printf (context->printer, _(" inlined from %qs"),
473 identifier_to_locale (lang_hooks.decl_printable_name (fndecl, 2)));
476 pp_character (context->printer, ':');
479 diagnostic_set_last_function (context, diagnostic);
480 pp_flush (context->printer);
481 context->printer->prefix = old_prefix;
482 free ((char*) new_prefix);
487 lhd_callgraph_analyze_expr (tree *tp ATTRIBUTE_UNUSED,
488 int *walk_subtrees ATTRIBUTE_UNUSED)
494 lhd_make_node (enum tree_code code)
496 return make_node (code);
500 lhd_to_target_charset (HOST_WIDE_INT c)
506 lhd_expr_to_decl (tree expr, bool *tc ATTRIBUTE_UNUSED, bool *se ATTRIBUTE_UNUSED)
511 /* Return sharing kind if OpenMP sharing attribute of DECL is
512 predetermined, OMP_CLAUSE_DEFAULT_UNSPECIFIED otherwise. */
514 enum omp_clause_default_kind
515 lhd_omp_predetermined_sharing (tree decl ATTRIBUTE_UNUSED)
517 if (DECL_ARTIFICIAL (decl))
518 return OMP_CLAUSE_DEFAULT_SHARED;
519 return OMP_CLAUSE_DEFAULT_UNSPECIFIED;
522 /* Generate code to copy SRC to DST. */
525 lhd_omp_assignment (tree clause ATTRIBUTE_UNUSED, tree dst, tree src)
527 return build2 (MODIFY_EXPR, TREE_TYPE (dst), dst, src);
530 /* Register language specific type size variables as potentially OpenMP
531 firstprivate variables. */
534 lhd_omp_firstprivatize_type_sizes (struct gimplify_omp_ctx *c ATTRIBUTE_UNUSED,
535 tree t ATTRIBUTE_UNUSED)
539 /* Common function for add_builtin_function and
540 add_builtin_function_ext_scope. */
542 add_builtin_function_common (const char *name,
545 enum built_in_class cl,
546 const char *library_name,
550 tree id = get_identifier (name);
551 tree decl = build_decl (BUILTINS_LOCATION, FUNCTION_DECL, id, type);
553 TREE_PUBLIC (decl) = 1;
554 DECL_EXTERNAL (decl) = 1;
555 DECL_BUILT_IN_CLASS (decl) = cl;
557 DECL_FUNCTION_CODE (decl) = (enum built_in_function) function_code;
559 /* DECL_FUNCTION_CODE is a bitfield; verify that the value fits. */
560 gcc_assert (DECL_FUNCTION_CODE (decl) == function_code);
564 tree libname = get_identifier (library_name);
565 SET_DECL_ASSEMBLER_NAME (decl, libname);
568 /* Possibly apply some default attributes to this built-in function. */
570 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
572 decl_attributes (&decl, NULL_TREE, 0);
578 /* Create a builtin function. */
581 add_builtin_function (const char *name,
584 enum built_in_class cl,
585 const char *library_name,
588 return add_builtin_function_common (name, type, function_code, cl,
590 lang_hooks.builtin_function);
593 /* Like add_builtin_function, but make sure the scope is the external scope.
594 This is used to delay putting in back end builtin functions until the ISA
595 that defines the builtin is declared via function specific target options,
596 which can save memory for machines like the x86_64 that have multiple ISAs.
597 If this points to the same function as builtin_function, the backend must
598 add all of the builtins at program initialization time. */
601 add_builtin_function_ext_scope (const char *name,
604 enum built_in_class cl,
605 const char *library_name,
608 return add_builtin_function_common (name, type, function_code, cl,
610 lang_hooks.builtin_function_ext_scope);
614 lhd_builtin_function (tree decl)
616 lang_hooks.decls.pushdecl (decl);
622 /* Used to save and restore any previously active section. */
623 static section *saved_section;
626 /* Begin a new LTO output section named NAME. This default implementation
627 saves the old section and emits assembly code to switch to the new
631 lhd_begin_section (const char *name)
635 /* Save the old section so we can restore it in lto_end_asm_section. */
636 gcc_assert (!saved_section);
637 saved_section = in_section;
639 saved_section = text_section;
641 /* Create a new section and switch to it. */
642 section = get_section (name, SECTION_DEBUG, NULL);
643 switch_to_section (section);
647 /* Write DATA of length LEN to the current LTO output section. This default
648 implementation just calls assemble_string and frees BLOCK. */
651 lhd_append_data (const void *data, size_t len, void *block)
654 assemble_string ((const char *)data, len);
659 /* Finish the current LTO output section. This default implementation emits
660 assembly code to switch to any section previously saved by
661 lhd_begin_section. */
664 lhd_end_section (void)
668 switch_to_section (saved_section);
669 saved_section = NULL;