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 2, 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 COPYING. If not, write to
20 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
25 #include "coretypes.h"
30 #include "tree-inline.h"
31 #include "tree-gimple.h"
33 #include "insn-config.h"
34 #include "integrate.h"
36 #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)
150 /* The language-independent code should never use the
151 DECL_ASSEMBLER_NAME for lots of DECLs. Only FUNCTION_DECLs and
152 VAR_DECLs for variables with static storage duration need a real
153 DECL_ASSEMBLER_NAME. */
154 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
155 || (TREE_CODE (decl) == VAR_DECL
156 && (TREE_STATIC (decl)
157 || DECL_EXTERNAL (decl)
158 || TREE_PUBLIC (decl))));
160 /* By default, assume the name to use in assembly code is the same
161 as that used in the source language. (That's correct for C, and
162 GCC used to set DECL_ASSEMBLER_NAME to the same value as
163 DECL_NAME in build_decl, so this choice provides backwards
164 compatibility with existing front-ends.
166 Can't use just the variable's own name for a variable whose scope
167 is less than the whole compilation. Concatenate a distinguishing
168 number - we use the DECL_UID. */
169 if (TREE_PUBLIC (decl) || DECL_CONTEXT (decl) == NULL_TREE)
170 SET_DECL_ASSEMBLER_NAME (decl, DECL_NAME (decl));
173 const char *name = IDENTIFIER_POINTER (DECL_NAME (decl));
176 ASM_FORMAT_PRIVATE_NAME (label, name, DECL_UID (decl));
177 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (label));
181 /* Type promotion for variable arguments. */
183 lhd_type_promotes_to (tree ARG_UNUSED (type))
188 /* Registration of machine- or os-specific builtin types. */
190 lhd_register_builtin_type (tree ARG_UNUSED (type),
191 const char * ARG_UNUSED (name))
195 /* Invalid use of an incomplete type. */
197 lhd_incomplete_type_error (tree ARG_UNUSED (value), tree type)
199 gcc_assert (TREE_CODE (type) == ERROR_MARK);
203 /* Provide a default routine for alias sets that always returns -1. This
204 is used by languages that don't need to do anything special. */
207 lhd_get_alias_set (tree ARG_UNUSED (t))
212 /* Provide a hook routine for alias sets that always returns 0. This is
213 used by languages that haven't deal with alias sets yet. */
216 hook_get_alias_set_0 (tree ARG_UNUSED (t))
221 /* This is the default expand_expr function. */
224 lhd_expand_expr (tree ARG_UNUSED (t), rtx ARG_UNUSED (r),
225 enum machine_mode ARG_UNUSED (mm),
227 rtx * ARG_UNUSED (a))
232 /* The default language-specific function for expanding a decl. After
233 the language-independent cases are handled, this function will be
234 called. If this function is not defined, it is assumed that
235 declarations other than those for variables and labels do not require
236 any RTL generation. */
239 lhd_expand_decl (tree ARG_UNUSED (t))
244 /* This is the default decl_printable_name function. */
247 lhd_decl_printable_name (tree decl, int ARG_UNUSED (verbosity))
249 gcc_assert (decl && DECL_NAME (decl));
250 return IDENTIFIER_POINTER (DECL_NAME (decl));
253 /* This is the default dwarf_name function. */
256 lhd_dwarf_name (tree t, int verbosity)
258 gcc_assert (DECL_P (t));
260 return lang_hooks.decl_printable_name (t, verbosity);
263 /* This compares two types for equivalence ("compatible" in C-based languages).
264 This routine should only return 1 if it is sure. It should not be used
265 in contexts where erroneously returning 0 causes problems. */
268 lhd_types_compatible_p (tree x, tree y)
270 return TYPE_MAIN_VARIANT (x) == TYPE_MAIN_VARIANT (y);
273 /* lang_hooks.tree_inlining.walk_subtrees is called by walk_tree()
274 after handling common cases, but before walking code-specific
275 sub-trees. If this hook is overridden for a language, it should
276 handle language-specific tree codes, as well as language-specific
277 information associated to common tree codes. If a tree node is
278 completely handled within this function, it should set *SUBTREES to
279 0, so that generic handling isn't attempted. The generic handling
280 cannot deal with language-specific tree codes, so make sure it is
281 set properly. Both SUBTREES and *SUBTREES is guaranteed to be
282 nonzero when the function is called. */
285 lhd_tree_inlining_walk_subtrees (tree *tp ATTRIBUTE_UNUSED,
286 int *subtrees ATTRIBUTE_UNUSED,
287 walk_tree_fn func ATTRIBUTE_UNUSED,
288 void *data ATTRIBUTE_UNUSED,
289 struct pointer_set_t *pset ATTRIBUTE_UNUSED)
294 /* lang_hooks.tree_inlining.cannot_inline_tree_fn is called to
295 determine whether there are language-specific reasons for not
296 inlining a given function. */
299 lhd_tree_inlining_cannot_inline_tree_fn (tree *fnp)
301 if (flag_really_no_inline
302 && lookup_attribute ("always_inline", DECL_ATTRIBUTES (*fnp)) == NULL)
308 /* lang_hooks.tree_inlining.disregard_inline_limits is called to
309 determine whether a function should be considered for inlining even
310 if it would exceed inlining limits. */
313 lhd_tree_inlining_disregard_inline_limits (tree fn)
315 if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)) != NULL)
321 /* lang_hooks.tree_inlining.add_pending_fn_decls is called before
322 starting to inline a function, to push any language-specific
323 functions that should not be inlined into the current function,
324 into VAFNP. PFN is the top of varray, and should be returned if no
325 functions are pushed into VAFNP. The top of the varray should be
329 lhd_tree_inlining_add_pending_fn_decls (void *vafnp ATTRIBUTE_UNUSED, tree pfn)
334 /* lang_hooks.tree_inlining.auto_var_in_fn_p is called to determine
335 whether VT is an automatic variable defined in function FT. */
338 lhd_tree_inlining_auto_var_in_fn_p (tree var, tree fn)
340 return (DECL_P (var) && DECL_CONTEXT (var) == fn
341 && (((TREE_CODE (var) == VAR_DECL || TREE_CODE (var) == PARM_DECL)
342 && ! TREE_STATIC (var))
343 || TREE_CODE (var) == LABEL_DECL
344 || TREE_CODE (var) == RESULT_DECL));
347 /* lang_hooks.tree_inlining.anon_aggr_type_p determines whether T is a
348 type node representing an anonymous aggregate (union, struct, etc),
349 i.e., one whose members are in the same scope as the union itself. */
352 lhd_tree_inlining_anon_aggr_type_p (tree t ATTRIBUTE_UNUSED)
357 /* lang_hooks.tree_inlining.start_inlining and end_inlining perform any
358 language-specific bookkeeping necessary for processing
359 FN. start_inlining returns nonzero if inlining should proceed, zero if
362 For instance, the C++ version keeps track of template instantiations to
363 avoid infinite recursion. */
366 lhd_tree_inlining_start_inlining (tree fn ATTRIBUTE_UNUSED)
372 lhd_tree_inlining_end_inlining (tree fn ATTRIBUTE_UNUSED)
376 /* lang_hooks.tree_inlining.convert_parm_for_inlining performs any
377 language-specific conversion before assigning VALUE to PARM. */
380 lhd_tree_inlining_convert_parm_for_inlining (tree parm ATTRIBUTE_UNUSED,
382 tree fndecl ATTRIBUTE_UNUSED,
383 int argnum ATTRIBUTE_UNUSED)
388 /* lang_hooks.tree_dump.dump_tree: Dump language-specific parts of tree
389 nodes. Returns nonzero if it does not want the usual dumping of the
393 lhd_tree_dump_dump_tree (void *di ATTRIBUTE_UNUSED, tree t ATTRIBUTE_UNUSED)
398 /* lang_hooks.tree_dump.type_qual: Determine type qualifiers in a
399 language-specific way. */
402 lhd_tree_dump_type_quals (tree t)
404 return TYPE_QUALS (t);
407 /* lang_hooks.expr_size: Determine the size of the value of an expression T
408 in a language-specific way. Returns a tree for the size in bytes. */
411 lhd_expr_size (tree exp)
414 && DECL_SIZE_UNIT (exp) != 0)
415 return DECL_SIZE_UNIT (exp);
417 return size_in_bytes (TREE_TYPE (exp));
420 /* lang_hooks.gimplify_expr re-writes *EXPR_P into GIMPLE form. */
423 lhd_gimplify_expr (tree *expr_p ATTRIBUTE_UNUSED, tree *pre_p ATTRIBUTE_UNUSED,
424 tree *post_p ATTRIBUTE_UNUSED)
429 /* lang_hooks.tree_size: Determine the size of a tree with code C,
430 which is a language-specific tree code in category tcc_constant or
431 tcc_exceptional. The default expects never to be called. */
433 lhd_tree_size (enum tree_code c ATTRIBUTE_UNUSED)
438 /* Return true if decl, which is a function decl, may be called by a
442 lhd_decl_ok_for_sibcall (tree decl ATTRIBUTE_UNUSED)
447 /* Return the COMDAT group into which DECL should be placed. */
450 lhd_comdat_group (tree decl)
452 return IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
455 /* lang_hooks.decls.final_write_globals: perform final processing on
458 write_global_declarations (void)
460 /* Really define vars that have had only a tentative definition.
461 Really output inline functions that must actually be callable
462 and have not been output so far. */
464 tree globals = lang_hooks.decls.getdecls ();
465 int len = list_length (globals);
466 tree *vec = XNEWVEC (tree, len);
470 /* Process the decls in reverse order--earliest first.
471 Put them into VEC from back to front, then take out from front. */
473 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
474 vec[len - i - 1] = decl;
476 wrapup_global_declarations (vec, len);
477 check_global_declarations (vec, len);
478 emit_debug_global_declarations (vec, len);
484 /* Called to perform language-specific initialization of CTX. */
486 lhd_initialize_diagnostics (struct diagnostic_context *ctx ATTRIBUTE_UNUSED)
490 /* The default function to print out name of current function that caused
493 lhd_print_error_function (diagnostic_context *context, const char *file)
495 if (diagnostic_last_function_changed (context))
497 const char *old_prefix = context->printer->prefix;
498 char *new_prefix = file ? file_name_as_prefix (file) : NULL;
500 pp_set_prefix (context->printer, new_prefix);
502 if (current_function_decl == NULL)
503 pp_printf (context->printer, _("At top level:"));
506 if (TREE_CODE (TREE_TYPE (current_function_decl)) == METHOD_TYPE)
508 (context->printer, _("In member function %qs:"),
509 lang_hooks.decl_printable_name (current_function_decl, 2));
512 (context->printer, _("In function %qs:"),
513 lang_hooks.decl_printable_name (current_function_decl, 2));
516 diagnostic_set_last_function (context);
517 pp_flush (context->printer);
518 context->printer->prefix = old_prefix;
519 free ((char*) new_prefix);
524 lhd_callgraph_analyze_expr (tree *tp ATTRIBUTE_UNUSED,
525 int *walk_subtrees ATTRIBUTE_UNUSED,
526 tree decl ATTRIBUTE_UNUSED)
532 lhd_make_node (enum tree_code code)
534 return make_node (code);
538 lhd_to_target_charset (HOST_WIDE_INT c)
544 lhd_expr_to_decl (tree expr, bool *tc ATTRIBUTE_UNUSED,
545 bool *ti ATTRIBUTE_UNUSED, bool *se ATTRIBUTE_UNUSED)
550 /* Return sharing kind if OpenMP sharing attribute of DECL is
551 predetermined, OMP_CLAUSE_DEFAULT_UNSPECIFIED otherwise. */
553 enum omp_clause_default_kind
554 lhd_omp_predetermined_sharing (tree decl ATTRIBUTE_UNUSED)
556 if (DECL_ARTIFICIAL (decl))
557 return OMP_CLAUSE_DEFAULT_SHARED;
558 return OMP_CLAUSE_DEFAULT_UNSPECIFIED;
561 /* Generate code to copy SRC to DST. */
564 lhd_omp_assignment (tree clause ATTRIBUTE_UNUSED, tree dst, tree src)
566 return build_gimple_modify_stmt (dst, src);
569 /* Register language specific type size variables as potentially OpenMP
570 firstprivate variables. */
573 lhd_omp_firstprivatize_type_sizes (struct gimplify_omp_ctx *c ATTRIBUTE_UNUSED,
574 tree t ATTRIBUTE_UNUSED)
579 add_builtin_function (const char *name,
582 enum built_in_class cl,
583 const char *library_name,
586 tree id = get_identifier (name);
587 tree decl = build_decl (FUNCTION_DECL, id, type);
589 TREE_PUBLIC (decl) = 1;
590 DECL_EXTERNAL (decl) = 1;
591 DECL_BUILT_IN_CLASS (decl) = cl;
592 DECL_FUNCTION_CODE (decl) = function_code;
596 tree libname = get_identifier (library_name);
597 SET_DECL_ASSEMBLER_NAME (decl, libname);
600 /* Possibly apply some default attributes to this built-in function. */
602 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
604 decl_attributes (&decl, NULL_TREE, 0);
606 return lang_hooks.builtin_function (decl);
611 lhd_builtin_function (tree decl)
613 lang_hooks.decls.pushdecl (decl);
617 /* If TYPE is an integral type, return an equivalent type which is
618 unsigned iff UNSIGNEDP is true. If TYPE is not an integral type,
619 return TYPE itself. */
622 get_signed_or_unsigned_type (int unsignedp, tree type)
624 if (!INTEGRAL_TYPE_P (type) || TYPE_UNSIGNED (type) == unsignedp)
627 return lang_hooks.types.signed_or_unsigned_type(unsignedp, type);
630 /* Default implementation of the signed_or_unsigned_type language hook */
633 lhd_signed_or_unsigned_type (int unsignedp, tree type)
635 return lang_hooks.types.type_for_size (TYPE_PRECISION (type), unsignedp);