1 /* Default language-specific hooks.
2 Copyright 2001, 2002 Free Software Foundation, Inc.
3 Contributed by Alexandre Oliva <aoliva@redhat.com>
4
5 This file is part of GNU CC.
6
7 GNU CC 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)
10 any later version.
11
12 GNU CC 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.
16
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
21
22 #include "config.h"
23 #include "system.h"
24 #include "toplev.h"
25 #include "tree.h"
26 #include "c-tree.h"
27 #include "tree-inline.h"
28 #include "rtl.h"
29 #include "insn-config.h"
30 #include "integrate.h"
31 #include "flags.h"
32 #include "langhooks.h"
33 #include "langhooks-def.h"
34
35 /* Do nothing; in many cases the default hook. */
36
37 void
lhd_do_nothing()38 lhd_do_nothing ()
39 {
40 }
41
42 /* Do nothing (tree). */
43
44 void
lhd_do_nothing_t(t)45 lhd_do_nothing_t (t)
46 tree t ATTRIBUTE_UNUSED;
47 {
48 }
49
50 /* Do nothing (int). */
51
52 void
lhd_do_nothing_i(i)53 lhd_do_nothing_i (i)
54 int i ATTRIBUTE_UNUSED;
55 {
56 }
57
58 /* Do nothing (function). */
59
60 void
lhd_do_nothing_f(f)61 lhd_do_nothing_f (f)
62 struct function *f ATTRIBUTE_UNUSED;
63 {
64 }
65
66 /* Do nothing (return the tree node passed). */
67
68 tree
lhd_return_tree(t)69 lhd_return_tree (t)
70 tree t;
71 {
72 return t;
73 }
74
75 /* Do nothing (return NULL_TREE). */
76
77 tree
lhd_return_null_tree(t)78 lhd_return_null_tree (t)
79 tree t ATTRIBUTE_UNUSED;
80 {
81 return NULL_TREE;
82 }
83
84 /* Do nothing; the default hook to decode an option. */
85
86 int
lhd_decode_option(argc,argv)87 lhd_decode_option (argc, argv)
88 int argc ATTRIBUTE_UNUSED;
89 char **argv ATTRIBUTE_UNUSED;
90 {
91 return 0;
92 }
93
94 /* Called from by print-tree.c. */
95
96 void
lhd_print_tree_nothing(file,node,indent)97 lhd_print_tree_nothing (file, node, indent)
98 FILE *file ATTRIBUTE_UNUSED;
99 tree node ATTRIBUTE_UNUSED;
100 int indent ATTRIBUTE_UNUSED;
101 {
102 }
103
104 /* Called from safe_from_p. */
105
106 int
lhd_safe_from_p(x,exp)107 lhd_safe_from_p (x, exp)
108 rtx x ATTRIBUTE_UNUSED;
109 tree exp ATTRIBUTE_UNUSED;
110 {
111 return 1;
112 }
113
114 /* Called from unsafe_for_reeval. */
115
116 int
lhd_unsafe_for_reeval(t)117 lhd_unsafe_for_reeval (t)
118 tree t ATTRIBUTE_UNUSED;
119 {
120 return -1;
121 }
122
123 /* Called from staticp. */
124
125 int
lhd_staticp(exp)126 lhd_staticp (exp)
127 tree exp ATTRIBUTE_UNUSED;
128 {
129 return 0;
130 }
131
132 /* Called from check_global_declarations. */
133
134 bool
lhd_warn_unused_global_decl(decl)135 lhd_warn_unused_global_decl (decl)
136 tree decl;
137 {
138 /* This is what used to exist in check_global_declarations. Probably
139 not many of these actually apply to non-C languages. */
140
141 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
142 return false;
143 if (TREE_CODE (decl) == VAR_DECL && TREE_READONLY (decl))
144 return false;
145 if (DECL_IN_SYSTEM_HEADER (decl))
146 return false;
147
148 return true;
149 }
150
151 /* Set the DECL_ASSEMBLER_NAME for DECL. */
152 void
lhd_set_decl_assembler_name(decl)153 lhd_set_decl_assembler_name (decl)
154 tree decl;
155 {
156 /* The language-independent code should never use the
157 DECL_ASSEMBLER_NAME for lots of DECLs. Only FUNCTION_DECLs and
158 VAR_DECLs for variables with static storage duration need a real
159 DECL_ASSEMBLER_NAME. */
160 if (TREE_CODE (decl) == FUNCTION_DECL
161 || (TREE_CODE (decl) == VAR_DECL
162 && (TREE_STATIC (decl)
163 || DECL_EXTERNAL (decl)
164 || TREE_PUBLIC (decl))))
165 /* By default, assume the name to use in assembly code is the
166 same as that used in the source language. (That's correct
167 for C, and GCC used to set DECL_ASSEMBLER_NAME to the same
168 value as DECL_NAME in build_decl, so this choice provides
169 backwards compatibility with existing front-ends. */
170 SET_DECL_ASSEMBLER_NAME (decl, DECL_NAME (decl));
171 else
172 /* Nobody should ever be asking for the DECL_ASSEMBLER_NAME of
173 these DECLs -- unless they're in language-dependent code, in
174 which case set_decl_assembler_name hook should handle things. */
175 abort ();
176 }
177
178 /* By default we always allow bit-field based optimizations. */
179 bool
lhd_can_use_bit_fields_p()180 lhd_can_use_bit_fields_p ()
181 {
182 return true;
183 }
184
185 /* Provide a default routine to clear the binding stack. This is used
186 by languages that don't need to do anything special. */
187 void
lhd_clear_binding_stack()188 lhd_clear_binding_stack ()
189 {
190 while (! (*lang_hooks.decls.global_bindings_p) ())
191 poplevel (0, 0, 0);
192 }
193
194 /* Type promotion for variable arguments. */
195 tree
lhd_type_promotes_to(type)196 lhd_type_promotes_to (type)
197 tree type ATTRIBUTE_UNUSED;
198 {
199 abort ();
200 }
201
202 /* Invalid use of an incomplete type. */
203 void
lhd_incomplete_type_error(value,type)204 lhd_incomplete_type_error (value, type)
205 tree value ATTRIBUTE_UNUSED, type;
206 {
207 if (TREE_CODE (type) == ERROR_MARK)
208 return;
209
210 abort ();
211 }
212
213 /* Provide a default routine for alias sets that always returns -1. This
214 is used by languages that don't need to do anything special. */
215
216 HOST_WIDE_INT
lhd_get_alias_set(t)217 lhd_get_alias_set (t)
218 tree t ATTRIBUTE_UNUSED;
219 {
220 return -1;
221 }
222
223 /* Provide a hook routine for alias sets that always returns 0. This is
224 used by languages that haven't deal with alias sets yet. */
225
226 HOST_WIDE_INT
hook_get_alias_set_0(t)227 hook_get_alias_set_0 (t)
228 tree t ATTRIBUTE_UNUSED;
229 {
230 return 0;
231 }
232
233 /* This is the default expand_expr function. */
234
235 rtx
lhd_expand_expr(t,r,mm,em)236 lhd_expand_expr (t, r, mm, em)
237 tree t ATTRIBUTE_UNUSED;
238 rtx r ATTRIBUTE_UNUSED;
239 enum machine_mode mm ATTRIBUTE_UNUSED;
240 int em ATTRIBUTE_UNUSED;
241 {
242 abort ();
243 }
244
245 /* This is the default decl_printable_name function. */
246
247 const char *
lhd_decl_printable_name(decl,verbosity)248 lhd_decl_printable_name (decl, verbosity)
249 tree decl;
250 int verbosity ATTRIBUTE_UNUSED;
251 {
252 return IDENTIFIER_POINTER (DECL_NAME (decl));
253 }
254
255 /* lang_hooks.tree_inlining.walk_subtrees is called by walk_tree()
256 after handling common cases, but before walking code-specific
257 sub-trees. If this hook is overridden for a language, it should
258 handle language-specific tree codes, as well as language-specific
259 information associated to common tree codes. If a tree node is
260 completely handled within this function, it should set *SUBTREES to
261 0, so that generic handling isn't attempted. For language-specific
262 tree codes, generic handling would abort(), so make sure it is set
263 properly. Both SUBTREES and *SUBTREES is guaranteed to be nonzero
264 when the function is called. */
265
266 tree
lhd_tree_inlining_walk_subtrees(tp,subtrees,func,data,htab)267 lhd_tree_inlining_walk_subtrees (tp,subtrees,func,data,htab)
268 tree *tp ATTRIBUTE_UNUSED;
269 int *subtrees ATTRIBUTE_UNUSED;
270 walk_tree_fn func ATTRIBUTE_UNUSED;
271 void *data ATTRIBUTE_UNUSED;
272 void *htab ATTRIBUTE_UNUSED;
273 {
274 return NULL_TREE;
275 }
276
277 /* lang_hooks.tree_inlining.cannot_inline_tree_fn is called to
278 determine whether there are language-specific reasons for not
279 inlining a given function. */
280
281 int
lhd_tree_inlining_cannot_inline_tree_fn(fnp)282 lhd_tree_inlining_cannot_inline_tree_fn (fnp)
283 tree *fnp;
284 {
285 if (flag_really_no_inline
286 && lookup_attribute ("always_inline", DECL_ATTRIBUTES (*fnp)) == NULL)
287 return 1;
288
289 return 0;
290 }
291
292 /* lang_hooks.tree_inlining.disregard_inline_limits is called to
293 determine whether a function should be considered for inlining even
294 if it would exceed inlining limits. */
295
296 int
lhd_tree_inlining_disregard_inline_limits(fn)297 lhd_tree_inlining_disregard_inline_limits (fn)
298 tree fn;
299 {
300 if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)) != NULL)
301 return 1;
302
303 return 0;
304 }
305
306 /* lang_hooks.tree_inlining.add_pending_fn_decls is called before
307 starting to inline a function, to push any language-specific
308 functions that should not be inlined into the current function,
309 into VAFNP. PFN is the top of varray, and should be returned if no
310 functions are pushed into VAFNP. The top of the varray should be
311 returned. */
312
313 tree
lhd_tree_inlining_add_pending_fn_decls(vafnp,pfn)314 lhd_tree_inlining_add_pending_fn_decls (vafnp, pfn)
315 void *vafnp ATTRIBUTE_UNUSED;
316 tree pfn;
317 {
318 return pfn;
319 }
320
321 /* lang_hooks.tree_inlining.tree_chain_matters_p indicates whether the
322 TREE_CHAIN of a language-specific tree node is relevant, i.e.,
323 whether it should be walked, copied and preserved across copies. */
324
325 int
lhd_tree_inlining_tree_chain_matters_p(t)326 lhd_tree_inlining_tree_chain_matters_p (t)
327 tree t ATTRIBUTE_UNUSED;
328 {
329 return 0;
330 }
331
332 /* lang_hooks.tree_inlining.auto_var_in_fn_p is called to determine
333 whether VT is an automatic variable defined in function FT. */
334
335 int
lhd_tree_inlining_auto_var_in_fn_p(var,fn)336 lhd_tree_inlining_auto_var_in_fn_p (var, fn)
337 tree var, fn;
338 {
339 return (DECL_P (var) && DECL_CONTEXT (var) == fn
340 && (((TREE_CODE (var) == VAR_DECL || TREE_CODE (var) == PARM_DECL)
341 && ! TREE_STATIC (var))
342 || TREE_CODE (var) == LABEL_DECL
343 || TREE_CODE (var) == RESULT_DECL));
344 }
345
346 /* lang_hooks.tree_inlining.copy_res_decl_for_inlining should return a
347 declaration for the result RES of function FN to be inlined into
348 CALLER. NDP points to an integer that should be set in case a new
349 declaration wasn't created (presumably because RES was of aggregate
350 type, such that a TARGET_EXPR is used for the result). TEXPS is a
351 pointer to a varray with the stack of TARGET_EXPRs seen while
352 inlining functions into caller; the top of TEXPS is supposed to
353 match RES. */
354
355 tree
lhd_tree_inlining_copy_res_decl_for_inlining(res,fn,caller,dm,ndp,texps)356 lhd_tree_inlining_copy_res_decl_for_inlining (res, fn, caller,
357 dm, ndp, texps)
358 tree res, fn, caller;
359 void *dm ATTRIBUTE_UNUSED;
360 int *ndp ATTRIBUTE_UNUSED;
361 void *texps ATTRIBUTE_UNUSED;
362 {
363 return copy_decl_for_inlining (res, fn, caller);
364 }
365
366 /* lang_hooks.tree_inlining.anon_aggr_type_p determines whether T is a
367 type node representing an anonymous aggregate (union, struct, etc),
368 i.e., one whose members are in the same scope as the union itself. */
369
370 int
lhd_tree_inlining_anon_aggr_type_p(t)371 lhd_tree_inlining_anon_aggr_type_p (t)
372 tree t ATTRIBUTE_UNUSED;
373 {
374 return 0;
375 }
376
377 /* lang_hooks.tree_inlining.start_inlining and end_inlining perform any
378 language-specific bookkeeping necessary for processing
379 FN. start_inlining returns nonzero if inlining should proceed, zero if
380 not.
381
382 For instance, the C++ version keeps track of template instantiations to
383 avoid infinite recursion. */
384
385 int
lhd_tree_inlining_start_inlining(fn)386 lhd_tree_inlining_start_inlining (fn)
387 tree fn ATTRIBUTE_UNUSED;
388 {
389 return 1;
390 }
391
392 void
lhd_tree_inlining_end_inlining(fn)393 lhd_tree_inlining_end_inlining (fn)
394 tree fn ATTRIBUTE_UNUSED;
395 {
396 }
397
398 /* lang_hooks.tree_inlining.convert_parm_for_inlining performs any
399 language-specific conversion before assigning VALUE to PARM. */
400
401 tree
lhd_tree_inlining_convert_parm_for_inlining(parm,value,fndecl)402 lhd_tree_inlining_convert_parm_for_inlining (parm, value, fndecl)
403 tree parm ATTRIBUTE_UNUSED;
404 tree value;
405 tree fndecl ATTRIBUTE_UNUSED;
406 {
407 return value;
408 }
409
410 /* lang_hooks.tree_dump.dump_tree: Dump language-specific parts of tree
411 nodes. Returns nonzero if it does not want the usual dumping of the
412 second argument. */
413
414 int
lhd_tree_dump_dump_tree(di,t)415 lhd_tree_dump_dump_tree (di, t)
416 void *di ATTRIBUTE_UNUSED;
417 tree t ATTRIBUTE_UNUSED;
418 {
419 return 0;
420 }
421
422 /* lang_hooks.tree_dump.type_qual: Determine type qualifiers in a
423 language-specific way. */
424
425 int
lhd_tree_dump_type_quals(t)426 lhd_tree_dump_type_quals (t)
427 tree t;
428 {
429 return TYPE_QUALS (t);
430 }
431
432 /* lang_hooks.expr_size: Determine the size of the value of an expression T
433 in a language-specific way. Returns a tree for the size in bytes. */
434
435 tree
lhd_expr_size(exp)436 lhd_expr_size (exp)
437 tree exp;
438 {
439 if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'd'
440 && DECL_SIZE_UNIT (exp) != 0)
441 return DECL_SIZE_UNIT (exp);
442 else
443 return size_in_bytes (TREE_TYPE (exp));
444 }
445
446 /* Return true if decl, which is a function decl, may be called by a
447 sibcall. */
448
449 bool
lhd_decl_ok_for_sibcall(decl)450 lhd_decl_ok_for_sibcall (decl)
451 tree decl ATTRIBUTE_UNUSED;
452 {
453 return true;
454 }
455
456 /* lang_hooks.decls.final_write_globals: perform final processing on
457 global variables. */
458 void
write_global_declarations()459 write_global_declarations ()
460 {
461 /* Really define vars that have had only a tentative definition.
462 Really output inline functions that must actually be callable
463 and have not been output so far. */
464
465 tree globals = (*lang_hooks.decls.getdecls) ();
466 int len = list_length (globals);
467 tree *vec = (tree *) xmalloc (sizeof (tree) * len);
468 int i;
469 tree decl;
470
471 /* Process the decls in reverse order--earliest first.
472 Put them into VEC from back to front, then take out from front. */
473
474 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
475 vec[len - i - 1] = decl;
476
477 wrapup_global_declarations (vec, len);
478
479 check_global_declarations (vec, len);
480
481 /* Clean up. */
482 free (vec);
483 }
484