1 /* Default language-specific hooks.
2 Copyright 2001, 2002, 2003, 2004 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 2, 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 COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
24 #include "coretypes.h"
28 #include "tree-inline.h"
29 #include "tree-gimple.h"
31 #include "insn-config.h"
32 #include "integrate.h"
34 #include "langhooks.h"
35 #include "langhooks-def.h"
37 #include "diagnostic.h"
39 /* Do nothing; in many cases the default hook. */
46 /* Do nothing (tree). */
49 lhd_do_nothing_t (tree t ATTRIBUTE_UNUSED
)
53 /* Do nothing (int). */
56 lhd_do_nothing_i (int i ATTRIBUTE_UNUSED
)
60 /* Do nothing (int, int, int). Return NULL_TREE. */
63 lhd_do_nothing_iii_return_null_tree (int i ATTRIBUTE_UNUSED
,
64 int j ATTRIBUTE_UNUSED
,
65 int k ATTRIBUTE_UNUSED
)
70 /* Do nothing (function). */
73 lhd_do_nothing_f (struct function
*f ATTRIBUTE_UNUSED
)
77 /* Do nothing (return the tree node passed). */
80 lhd_return_tree (tree t
)
85 /* Do nothing (return NULL_TREE). */
88 lhd_return_null_tree_v (void)
93 /* Do nothing (return NULL_TREE). */
96 lhd_return_null_tree (tree t ATTRIBUTE_UNUSED
)
101 /* The default post options hook. */
104 lhd_post_options (const char **pfilename ATTRIBUTE_UNUSED
)
109 /* Called from by print-tree.c. */
112 lhd_print_tree_nothing (FILE *file ATTRIBUTE_UNUSED
,
113 tree node ATTRIBUTE_UNUSED
,
114 int indent ATTRIBUTE_UNUSED
)
118 /* Called from safe_from_p. */
121 lhd_safe_from_p (rtx x ATTRIBUTE_UNUSED
, tree exp ATTRIBUTE_UNUSED
)
126 /* Called from unsafe_for_reeval. */
129 lhd_unsafe_for_reeval (tree t ATTRIBUTE_UNUSED
)
134 /* Called from staticp. */
137 lhd_staticp (tree exp ATTRIBUTE_UNUSED
)
142 /* Called from check_global_declarations. */
145 lhd_warn_unused_global_decl (tree decl
)
147 /* This is what used to exist in check_global_declarations. Probably
148 not many of these actually apply to non-C languages. */
150 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_INLINE (decl
))
152 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_READONLY (decl
))
154 if (DECL_IN_SYSTEM_HEADER (decl
))
160 /* Number for making the label on the next
161 static variable internal to a function. */
163 static GTY(()) int var_labelno
;
165 /* Set the DECL_ASSEMBLER_NAME for DECL. */
167 lhd_set_decl_assembler_name (tree decl
)
169 /* The language-independent code should never use the
170 DECL_ASSEMBLER_NAME for lots of DECLs. Only FUNCTION_DECLs and
171 VAR_DECLs for variables with static storage duration need a real
172 DECL_ASSEMBLER_NAME. */
173 if (TREE_CODE (decl
) == FUNCTION_DECL
174 || (TREE_CODE (decl
) == VAR_DECL
175 && (TREE_STATIC (decl
)
176 || DECL_EXTERNAL (decl
)
177 || TREE_PUBLIC (decl
))))
179 /* By default, assume the name to use in assembly code is the
180 same as that used in the source language. (That's correct
181 for C, and GCC used to set DECL_ASSEMBLER_NAME to the same
182 value as DECL_NAME in build_decl, so this choice provides
183 backwards compatibility with existing front-ends.
185 Can't use just the variable's own name for a variable whose
186 scope is less than the whole compilation. Concatenate a
187 distinguishing number. */
188 if (!TREE_PUBLIC (decl
) && DECL_CONTEXT (decl
))
190 const char *name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
193 ASM_FORMAT_PRIVATE_NAME (label
, name
, var_labelno
);
195 SET_DECL_ASSEMBLER_NAME (decl
, get_identifier (label
));
198 SET_DECL_ASSEMBLER_NAME (decl
, DECL_NAME (decl
));
201 /* Nobody should ever be asking for the DECL_ASSEMBLER_NAME of
202 these DECLs -- unless they're in language-dependent code, in
203 which case set_decl_assembler_name hook should handle things. */
207 /* By default we always allow bit-field based optimizations. */
209 lhd_can_use_bit_fields_p (void)
214 /* Provide a default routine to clear the binding stack. This is used
215 by languages that don't need to do anything special. */
217 lhd_clear_binding_stack (void)
219 while (! lang_hooks
.decls
.global_bindings_p ())
220 lang_hooks
.decls
.poplevel (0, 0, 0);
223 /* Type promotion for variable arguments. */
225 lhd_type_promotes_to (tree type ATTRIBUTE_UNUSED
)
230 /* Registration of machine- or os-specific builtin types. */
232 lhd_register_builtin_type (tree type ATTRIBUTE_UNUSED
,
233 const char* name ATTRIBUTE_UNUSED
)
237 /* Invalid use of an incomplete type. */
239 lhd_incomplete_type_error (tree value ATTRIBUTE_UNUSED
, tree type
)
241 if (TREE_CODE (type
) == ERROR_MARK
)
247 /* Provide a default routine for alias sets that always returns -1. This
248 is used by languages that don't need to do anything special. */
251 lhd_get_alias_set (tree t ATTRIBUTE_UNUSED
)
256 /* Provide a hook routine for alias sets that always returns 0. This is
257 used by languages that haven't deal with alias sets yet. */
260 hook_get_alias_set_0 (tree t ATTRIBUTE_UNUSED
)
265 /* This is the default expand_expr function. */
268 lhd_expand_expr (tree t ATTRIBUTE_UNUSED
, rtx r ATTRIBUTE_UNUSED
,
269 enum machine_mode mm ATTRIBUTE_UNUSED
,
270 int em ATTRIBUTE_UNUSED
,
271 rtx
*a ATTRIBUTE_UNUSED
)
276 /* This is the default expand_decl function. */
277 /* The default language-specific function for expanding a DECL_STMT. After
278 the language-independent cases are handled, this function will be
279 called. If this function is not defined, it is assumed that
280 declarations other than those for variables and labels do not require
281 any RTL generation. */
284 lhd_expand_decl (tree t ATTRIBUTE_UNUSED
)
289 /* This is the default decl_printable_name function. */
292 lhd_decl_printable_name (tree decl
, int verbosity ATTRIBUTE_UNUSED
)
294 return IDENTIFIER_POINTER (DECL_NAME (decl
));
297 /* This compares two types for equivalence ("compatible" in C-based languages).
298 This routine should only return 1 if it is sure. It should not be used
299 in contexts where erroneously returning 0 causes problems. */
302 lhd_types_compatible_p (tree x
, tree y
)
304 return TYPE_MAIN_VARIANT (x
) == TYPE_MAIN_VARIANT (y
);
307 /* lang_hooks.tree_inlining.walk_subtrees is called by walk_tree()
308 after handling common cases, but before walking code-specific
309 sub-trees. If this hook is overridden for a language, it should
310 handle language-specific tree codes, as well as language-specific
311 information associated to common tree codes. If a tree node is
312 completely handled within this function, it should set *SUBTREES to
313 0, so that generic handling isn't attempted. For language-specific
314 tree codes, generic handling would abort(), so make sure it is set
315 properly. Both SUBTREES and *SUBTREES is guaranteed to be nonzero
316 when the function is called. */
319 lhd_tree_inlining_walk_subtrees (tree
*tp ATTRIBUTE_UNUSED
,
320 int *subtrees ATTRIBUTE_UNUSED
,
321 walk_tree_fn func ATTRIBUTE_UNUSED
,
322 void *data ATTRIBUTE_UNUSED
,
323 void *htab ATTRIBUTE_UNUSED
)
328 /* lang_hooks.tree_inlining.cannot_inline_tree_fn is called to
329 determine whether there are language-specific reasons for not
330 inlining a given function. */
333 lhd_tree_inlining_cannot_inline_tree_fn (tree
*fnp
)
335 if (flag_really_no_inline
336 && lookup_attribute ("always_inline", DECL_ATTRIBUTES (*fnp
)) == NULL
)
342 /* lang_hooks.tree_inlining.disregard_inline_limits is called to
343 determine whether a function should be considered for inlining even
344 if it would exceed inlining limits. */
347 lhd_tree_inlining_disregard_inline_limits (tree fn
)
349 if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn
)) != NULL
)
355 /* lang_hooks.tree_inlining.add_pending_fn_decls is called before
356 starting to inline a function, to push any language-specific
357 functions that should not be inlined into the current function,
358 into VAFNP. PFN is the top of varray, and should be returned if no
359 functions are pushed into VAFNP. The top of the varray should be
363 lhd_tree_inlining_add_pending_fn_decls (void *vafnp ATTRIBUTE_UNUSED
, tree pfn
)
368 /* lang_hooks.tree_inlining.auto_var_in_fn_p is called to determine
369 whether VT is an automatic variable defined in function FT. */
372 lhd_tree_inlining_auto_var_in_fn_p (tree var
, tree fn
)
374 return (DECL_P (var
) && DECL_CONTEXT (var
) == fn
375 && (((TREE_CODE (var
) == VAR_DECL
|| TREE_CODE (var
) == PARM_DECL
)
376 && ! TREE_STATIC (var
))
377 || TREE_CODE (var
) == LABEL_DECL
378 || TREE_CODE (var
) == RESULT_DECL
));
381 /* lang_hooks.tree_inlining.copy_res_decl_for_inlining should return a
382 declaration for the result RES of function FN to be inlined into
383 CALLER. NDP points to an integer that should be set in case a new
384 declaration wasn't created (presumably because RES was of aggregate
385 type, such that a TARGET_EXPR is used for the result). TEXPS is a
386 pointer to a varray with the stack of TARGET_EXPRs seen while
387 inlining functions into caller; the top of TEXPS is supposed to
391 lhd_tree_inlining_copy_res_decl_for_inlining (tree res
, tree fn
, tree caller
,
392 void *dm ATTRIBUTE_UNUSED
,
393 int *ndp ATTRIBUTE_UNUSED
,
394 tree return_slot_addr ATTRIBUTE_UNUSED
)
396 if (return_slot_addr
)
397 return build1 (INDIRECT_REF
, TREE_TYPE (TREE_TYPE (return_slot_addr
)),
400 return copy_decl_for_inlining (res
, fn
, caller
);
403 /* lang_hooks.tree_inlining.anon_aggr_type_p determines whether T is a
404 type node representing an anonymous aggregate (union, struct, etc),
405 i.e., one whose members are in the same scope as the union itself. */
408 lhd_tree_inlining_anon_aggr_type_p (tree t ATTRIBUTE_UNUSED
)
413 /* lang_hooks.tree_inlining.start_inlining and end_inlining perform any
414 language-specific bookkeeping necessary for processing
415 FN. start_inlining returns nonzero if inlining should proceed, zero if
418 For instance, the C++ version keeps track of template instantiations to
419 avoid infinite recursion. */
422 lhd_tree_inlining_start_inlining (tree fn ATTRIBUTE_UNUSED
)
428 lhd_tree_inlining_end_inlining (tree fn ATTRIBUTE_UNUSED
)
432 /* lang_hooks.tree_inlining.convert_parm_for_inlining performs any
433 language-specific conversion before assigning VALUE to PARM. */
436 lhd_tree_inlining_convert_parm_for_inlining (tree parm ATTRIBUTE_UNUSED
,
438 tree fndecl ATTRIBUTE_UNUSED
,
439 int argnum ATTRIBUTE_UNUSED
)
444 /* lang_hooks.tree_dump.dump_tree: Dump language-specific parts of tree
445 nodes. Returns nonzero if it does not want the usual dumping of the
449 lhd_tree_dump_dump_tree (void *di ATTRIBUTE_UNUSED
, tree t ATTRIBUTE_UNUSED
)
454 /* lang_hooks.tree_dump.type_qual: Determine type qualifiers in a
455 language-specific way. */
458 lhd_tree_dump_type_quals (tree t
)
460 return TYPE_QUALS (t
);
463 /* lang_hooks.expr_size: Determine the size of the value of an expression T
464 in a language-specific way. Returns a tree for the size in bytes. */
467 lhd_expr_size (tree exp
)
469 if (TREE_CODE_CLASS (TREE_CODE (exp
)) == 'd'
470 && DECL_SIZE_UNIT (exp
) != 0)
471 return DECL_SIZE_UNIT (exp
);
473 return size_in_bytes (TREE_TYPE (exp
));
476 /* lang_hooks.gimplify_expr re-writes *EXPR_P into GIMPLE form. */
479 lhd_gimplify_expr (tree
*expr_p ATTRIBUTE_UNUSED
, tree
*pre_p ATTRIBUTE_UNUSED
,
480 tree
*post_p ATTRIBUTE_UNUSED
)
485 /* lang_hooks.tree_size: Determine the size of a tree with code C,
486 which is a language-specific tree code in category 'x'. The
487 default expects never to be called. */
489 lhd_tree_size (enum tree_code c ATTRIBUTE_UNUSED
)
495 /* Return true if decl, which is a function decl, may be called by a
499 lhd_decl_ok_for_sibcall (tree decl ATTRIBUTE_UNUSED
)
504 /* lang_hooks.decls.final_write_globals: perform final processing on
507 write_global_declarations (void)
509 /* Really define vars that have had only a tentative definition.
510 Really output inline functions that must actually be callable
511 and have not been output so far. */
513 tree globals
= lang_hooks
.decls
.getdecls ();
514 int len
= list_length (globals
);
515 tree
*vec
= xmalloc (sizeof (tree
) * len
);
519 /* Process the decls in reverse order--earliest first.
520 Put them into VEC from back to front, then take out from front. */
522 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
523 vec
[len
- i
- 1] = decl
;
525 wrapup_global_declarations (vec
, len
);
527 check_global_declarations (vec
, len
);
533 /* Called to perform language-specific initialization of CTX. */
535 lhd_initialize_diagnostics (struct diagnostic_context
*ctx ATTRIBUTE_UNUSED
)
539 /* The default function to print out name of current function that caused
542 lhd_print_error_function (diagnostic_context
*context
, const char *file
)
544 if (diagnostic_last_function_changed (context
))
546 const char *old_prefix
= context
->printer
->prefix
;
547 char *new_prefix
= file
? file_name_as_prefix (file
) : NULL
;
549 pp_set_prefix (context
->printer
, new_prefix
);
551 if (current_function_decl
== NULL
)
552 pp_printf (context
->printer
, "At top level:");
555 if (TREE_CODE (TREE_TYPE (current_function_decl
)) == METHOD_TYPE
)
557 (context
->printer
, "In member function `%s':",
558 lang_hooks
.decl_printable_name (current_function_decl
, 2));
561 (context
->printer
, "In function `%s':",
562 lang_hooks
.decl_printable_name (current_function_decl
, 2));
565 diagnostic_set_last_function (context
);
566 pp_flush (context
->printer
);
567 context
->printer
->prefix
= old_prefix
;
568 free ((char*) new_prefix
);
573 lhd_callgraph_analyze_expr (tree
*tp ATTRIBUTE_UNUSED
,
574 int *walk_subtrees ATTRIBUTE_UNUSED
,
575 tree decl ATTRIBUTE_UNUSED
)
581 lhd_make_node (enum tree_code code
)
583 return make_node (code
);
586 #include "gt-langhooks.h"