1 /* Default language-specific hooks.
2 Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007
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"
30 #include "tree-gimple.h"
32 #include "insn-config.h"
33 #include "integrate.h"
35 #include "langhooks.h"
37 #include "langhooks-def.h"
39 #include "diagnostic.h"
41 /* Do nothing; in many cases the default hook. */
48 /* Do nothing (tree). */
51 lhd_do_nothing_t (tree ARG_UNUSED (t))
55 /* Do nothing (int). */
58 lhd_do_nothing_i (int ARG_UNUSED (i))
62 /* Do nothing (int, int, int). Return NULL_TREE. */
65 lhd_do_nothing_iii_return_null_tree (int ARG_UNUSED (i),
72 /* Do nothing (function). */
75 lhd_do_nothing_f (struct function * ARG_UNUSED (f))
79 /* Do nothing (return the tree node passed). */
82 lhd_return_tree (tree t)
87 /* Do nothing (return NULL_TREE). */
90 lhd_return_null_tree_v (void)
95 /* Do nothing (return NULL_TREE). */
98 lhd_return_null_tree (tree ARG_UNUSED (t))
103 /* The default post options hook. */
106 lhd_post_options (const char ** ARG_UNUSED (pfilename))
111 /* Called from by print-tree.c. */
114 lhd_print_tree_nothing (FILE * ARG_UNUSED (file),
115 tree ARG_UNUSED (node),
116 int ARG_UNUSED (indent))
120 /* Called from staticp. */
123 lhd_staticp (tree ARG_UNUSED (exp))
128 /* Called from check_global_declarations. */
131 lhd_warn_unused_global_decl (tree decl)
133 /* This is what used to exist in check_global_declarations. Probably
134 not many of these actually apply to non-C languages. */
136 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
138 if (TREE_CODE (decl) == VAR_DECL && TREE_READONLY (decl))
140 if (DECL_IN_SYSTEM_HEADER (decl))
146 /* Set the DECL_ASSEMBLER_NAME for DECL. */
148 lhd_set_decl_assembler_name (tree decl)
152 /* The language-independent code should never use the
153 DECL_ASSEMBLER_NAME for lots of DECLs. Only FUNCTION_DECLs and
154 VAR_DECLs for variables with static storage duration need a real
155 DECL_ASSEMBLER_NAME. */
156 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
157 || (TREE_CODE (decl) == VAR_DECL
158 && (TREE_STATIC (decl)
159 || DECL_EXTERNAL (decl)
160 || TREE_PUBLIC (decl))));
162 /* By default, assume the name to use in assembly code is the same
163 as that used in the source language. (That's correct for C, and
164 GCC used to set DECL_ASSEMBLER_NAME to the same value as
165 DECL_NAME in build_decl, so this choice provides backwards
166 compatibility with existing front-ends. This assumption is wrapped
167 in a target hook, to allow for target-specific modification of the
170 Can't use just the variable's own name for a variable whose scope
171 is less than the whole compilation. Concatenate a distinguishing
172 number - we use the DECL_UID. */
174 if (TREE_PUBLIC (decl) || DECL_CONTEXT (decl) == NULL_TREE)
175 id = targetm.mangle_decl_assembler_name (decl, DECL_NAME (decl));
178 const char *name = IDENTIFIER_POINTER (DECL_NAME (decl));
181 ASM_FORMAT_PRIVATE_NAME (label, name, DECL_UID (decl));
182 id = get_identifier (label);
184 SET_DECL_ASSEMBLER_NAME (decl, id);
188 /* Type promotion for variable arguments. */
190 lhd_type_promotes_to (tree ARG_UNUSED (type))
195 /* Registration of machine- or os-specific builtin types. */
197 lhd_register_builtin_type (tree ARG_UNUSED (type),
198 const char * ARG_UNUSED (name))
202 /* Invalid use of an incomplete type. */
204 lhd_incomplete_type_error (tree ARG_UNUSED (value), tree type)
206 gcc_assert (TREE_CODE (type) == ERROR_MARK);
210 /* Provide a default routine for alias sets that always returns -1. This
211 is used by languages that don't need to do anything special. */
214 lhd_get_alias_set (tree ARG_UNUSED (t))
219 /* This is the default expand_expr function. */
222 lhd_expand_expr (tree ARG_UNUSED (t), rtx ARG_UNUSED (r),
223 enum machine_mode ARG_UNUSED (mm),
225 rtx * ARG_UNUSED (a))
230 /* The default language-specific function for expanding a decl. After
231 the language-independent cases are handled, this function will be
232 called. If this function is not defined, it is assumed that
233 declarations other than those for variables and labels do not require
234 any RTL generation. */
237 lhd_expand_decl (tree ARG_UNUSED (t))
242 /* This is the default decl_printable_name function. */
245 lhd_decl_printable_name (tree decl, int ARG_UNUSED (verbosity))
247 gcc_assert (decl && DECL_NAME (decl));
248 return IDENTIFIER_POINTER (DECL_NAME (decl));
251 /* This is the default dwarf_name function. */
254 lhd_dwarf_name (tree t, int verbosity)
256 gcc_assert (DECL_P (t));
258 return lang_hooks.decl_printable_name (t, verbosity);
261 /* This compares two types for equivalence ("compatible" in C-based languages).
262 This routine should only return 1 if it is sure. It should not be used
263 in contexts where erroneously returning 0 causes problems. */
266 lhd_types_compatible_p (tree x, tree y)
268 return TYPE_MAIN_VARIANT (x) == TYPE_MAIN_VARIANT (y);
271 /* lang_hooks.tree_inlining.walk_subtrees is called by walk_tree()
272 after handling common cases, but before walking code-specific
273 sub-trees. If this hook is overridden for a language, it should
274 handle language-specific tree codes, as well as language-specific
275 information associated to common tree codes. If a tree node is
276 completely handled within this function, it should set *SUBTREES to
277 0, so that generic handling isn't attempted. The generic handling
278 cannot deal with language-specific tree codes, so make sure it is
279 set properly. Both SUBTREES and *SUBTREES is guaranteed to be
280 nonzero when the function is called. */
283 lhd_tree_inlining_walk_subtrees (tree *tp ATTRIBUTE_UNUSED,
284 int *subtrees ATTRIBUTE_UNUSED,
285 walk_tree_fn func ATTRIBUTE_UNUSED,
286 void *data ATTRIBUTE_UNUSED,
287 struct pointer_set_t *pset ATTRIBUTE_UNUSED)
292 /* lang_hooks.tree_inlining.cannot_inline_tree_fn is called to
293 determine whether there are language-specific reasons for not
294 inlining a given function. */
297 lhd_tree_inlining_cannot_inline_tree_fn (tree *fnp)
299 if (flag_really_no_inline
300 && lookup_attribute ("always_inline", DECL_ATTRIBUTES (*fnp)) == NULL)
306 /* lang_hooks.tree_inlining.disregard_inline_limits is called to
307 determine whether a function should be considered for inlining even
308 if it would exceed inlining limits. */
311 lhd_tree_inlining_disregard_inline_limits (tree fn)
313 if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)) != NULL)
319 /* lang_hooks.tree_inlining.auto_var_in_fn_p is called to determine
320 whether VT is an automatic variable defined in function FT. */
323 lhd_tree_inlining_auto_var_in_fn_p (tree var, tree fn)
325 return (DECL_P (var) && DECL_CONTEXT (var) == fn
326 && (((TREE_CODE (var) == VAR_DECL || TREE_CODE (var) == PARM_DECL)
327 && ! TREE_STATIC (var))
328 || TREE_CODE (var) == LABEL_DECL
329 || TREE_CODE (var) == RESULT_DECL));
332 /* lang_hooks.tree_dump.dump_tree: Dump language-specific parts of tree
333 nodes. Returns nonzero if it does not want the usual dumping of the
337 lhd_tree_dump_dump_tree (void *di ATTRIBUTE_UNUSED, tree t ATTRIBUTE_UNUSED)
342 /* lang_hooks.tree_dump.type_qual: Determine type qualifiers in a
343 language-specific way. */
346 lhd_tree_dump_type_quals (tree t)
348 return TYPE_QUALS (t);
351 /* lang_hooks.expr_size: Determine the size of the value of an expression T
352 in a language-specific way. Returns a tree for the size in bytes. */
355 lhd_expr_size (tree exp)
358 && DECL_SIZE_UNIT (exp) != 0)
359 return DECL_SIZE_UNIT (exp);
361 return size_in_bytes (TREE_TYPE (exp));
364 /* lang_hooks.gimplify_expr re-writes *EXPR_P into GIMPLE form. */
367 lhd_gimplify_expr (tree *expr_p ATTRIBUTE_UNUSED, tree *pre_p ATTRIBUTE_UNUSED,
368 tree *post_p ATTRIBUTE_UNUSED)
373 /* lang_hooks.tree_size: Determine the size of a tree with code C,
374 which is a language-specific tree code in category tcc_constant or
375 tcc_exceptional. The default expects never to be called. */
377 lhd_tree_size (enum tree_code c ATTRIBUTE_UNUSED)
382 /* Return true if decl, which is a function decl, may be called by a
386 lhd_decl_ok_for_sibcall (tree decl ATTRIBUTE_UNUSED)
391 /* Return the COMDAT group into which DECL should be placed. */
394 lhd_comdat_group (tree decl)
396 return IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
399 /* lang_hooks.decls.final_write_globals: perform final processing on
402 write_global_declarations (void)
404 /* Really define vars that have had only a tentative definition.
405 Really output inline functions that must actually be callable
406 and have not been output so far. */
408 tree globals = lang_hooks.decls.getdecls ();
409 int len = list_length (globals);
410 tree *vec = XNEWVEC (tree, len);
414 /* Process the decls in reverse order--earliest first.
415 Put them into VEC from back to front, then take out from front. */
417 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
418 vec[len - i - 1] = decl;
420 wrapup_global_declarations (vec, len);
421 check_global_declarations (vec, len);
422 emit_debug_global_declarations (vec, len);
428 /* Called to perform language-specific initialization of CTX. */
430 lhd_initialize_diagnostics (struct diagnostic_context *ctx ATTRIBUTE_UNUSED)
434 /* The default function to print out name of current function that caused
437 lhd_print_error_function (diagnostic_context *context, const char *file)
439 if (diagnostic_last_function_changed (context))
441 const char *old_prefix = context->printer->prefix;
442 char *new_prefix = file ? file_name_as_prefix (file) : NULL;
444 pp_set_prefix (context->printer, new_prefix);
446 if (current_function_decl == NULL)
447 pp_printf (context->printer, _("At top level:"));
450 if (TREE_CODE (TREE_TYPE (current_function_decl)) == METHOD_TYPE)
452 (context->printer, _("In member function %qs:"),
453 lang_hooks.decl_printable_name (current_function_decl, 2));
456 (context->printer, _("In function %qs:"),
457 lang_hooks.decl_printable_name (current_function_decl, 2));
460 diagnostic_set_last_function (context);
461 pp_flush (context->printer);
462 context->printer->prefix = old_prefix;
463 free ((char*) new_prefix);
468 lhd_callgraph_analyze_expr (tree *tp ATTRIBUTE_UNUSED,
469 int *walk_subtrees ATTRIBUTE_UNUSED,
470 tree decl ATTRIBUTE_UNUSED)
476 lhd_make_node (enum tree_code code)
478 return make_node (code);
482 lhd_to_target_charset (HOST_WIDE_INT c)
488 lhd_expr_to_decl (tree expr, bool *tc ATTRIBUTE_UNUSED,
489 bool *ti ATTRIBUTE_UNUSED, bool *se ATTRIBUTE_UNUSED)
494 /* Return sharing kind if OpenMP sharing attribute of DECL is
495 predetermined, OMP_CLAUSE_DEFAULT_UNSPECIFIED otherwise. */
497 enum omp_clause_default_kind
498 lhd_omp_predetermined_sharing (tree decl ATTRIBUTE_UNUSED)
500 if (DECL_ARTIFICIAL (decl))
501 return OMP_CLAUSE_DEFAULT_SHARED;
502 return OMP_CLAUSE_DEFAULT_UNSPECIFIED;
505 /* Generate code to copy SRC to DST. */
508 lhd_omp_assignment (tree clause ATTRIBUTE_UNUSED, tree dst, tree src)
510 return build_gimple_modify_stmt (dst, src);
513 /* Register language specific type size variables as potentially OpenMP
514 firstprivate variables. */
517 lhd_omp_firstprivatize_type_sizes (struct gimplify_omp_ctx *c ATTRIBUTE_UNUSED,
518 tree t ATTRIBUTE_UNUSED)
523 add_builtin_function (const char *name,
526 enum built_in_class cl,
527 const char *library_name,
530 tree id = get_identifier (name);
531 tree decl = build_decl (FUNCTION_DECL, id, type);
533 TREE_PUBLIC (decl) = 1;
534 DECL_EXTERNAL (decl) = 1;
535 DECL_BUILT_IN_CLASS (decl) = cl;
536 DECL_FUNCTION_CODE (decl) = function_code;
540 tree libname = get_identifier (library_name);
541 SET_DECL_ASSEMBLER_NAME (decl, libname);
544 /* Possibly apply some default attributes to this built-in function. */
546 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
548 decl_attributes (&decl, NULL_TREE, 0);
550 return lang_hooks.builtin_function (decl);
555 lhd_builtin_function (tree decl)
557 lang_hooks.decls.pushdecl (decl);