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69dcadff | 1 | /* Default language-specific hooks. |
43577e6b | 2 | Copyright 2001, 2002 Free Software Foundation, Inc. |
69dcadff AO |
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" | |
4977bab6 ZW |
24 | #include "coretypes.h" |
25 | #include "tm.h" | |
69dcadff AO |
26 | #include "toplev.h" |
27 | #include "tree.h" | |
89d684bb | 28 | #include "c-tree.h" |
69dcadff | 29 | #include "tree-inline.h" |
1affb409 JJ |
30 | #include "rtl.h" |
31 | #include "insn-config.h" | |
32 | #include "integrate.h" | |
29ac78d5 | 33 | #include "flags.h" |
59bee412 | 34 | #include "langhooks.h" |
d23c55c2 | 35 | #include "langhooks-def.h" |
59bee412 | 36 | |
77b1a921 | 37 | /* Do nothing; in many cases the default hook. */ |
8ac61af7 | 38 | |
77b1a921 | 39 | void |
d23c55c2 | 40 | lhd_do_nothing () |
77b1a921 NB |
41 | { |
42 | } | |
43 | ||
b03e38e1 | 44 | /* Do nothing (tree). */ |
63e1b1c4 NB |
45 | |
46 | void | |
47 | lhd_do_nothing_t (t) | |
48 | tree t ATTRIBUTE_UNUSED; | |
49 | { | |
50 | } | |
51 | ||
ff45c01e NB |
52 | /* Do nothing (int). */ |
53 | ||
54 | void | |
55 | lhd_do_nothing_i (i) | |
56 | int i ATTRIBUTE_UNUSED; | |
57 | { | |
58 | } | |
59 | ||
b03e38e1 NB |
60 | /* Do nothing (function). */ |
61 | ||
62 | void | |
63 | lhd_do_nothing_f (f) | |
64 | struct function *f ATTRIBUTE_UNUSED; | |
65 | { | |
66 | } | |
67 | ||
ac79cd5a RK |
68 | /* Do nothing (return the tree node passed). */ |
69 | ||
70 | tree | |
71 | lhd_return_tree (t) | |
72 | tree t; | |
73 | { | |
74 | return t; | |
75 | } | |
76 | ||
c88770e9 NB |
77 | /* Do nothing (return NULL_TREE). */ |
78 | ||
79 | tree | |
80 | lhd_return_null_tree (t) | |
81 | tree t ATTRIBUTE_UNUSED; | |
82 | { | |
83 | return NULL_TREE; | |
84 | } | |
85 | ||
77b1a921 | 86 | /* Do nothing; the default hook to decode an option. */ |
8ac61af7 | 87 | |
77b1a921 | 88 | int |
d23c55c2 | 89 | lhd_decode_option (argc, argv) |
77b1a921 NB |
90 | int argc ATTRIBUTE_UNUSED; |
91 | char **argv ATTRIBUTE_UNUSED; | |
92 | { | |
93 | return 0; | |
94 | } | |
69dcadff | 95 | |
4bfec483 NB |
96 | /* The default post options hook. */ |
97 | ||
98 | bool | |
99 | lhd_post_options (pfilename) | |
100 | const char **pfilename ATTRIBUTE_UNUSED; | |
101 | { | |
102 | return false; | |
103 | } | |
104 | ||
5d69f816 NB |
105 | /* Called from by print-tree.c. */ |
106 | ||
107 | void | |
108 | lhd_print_tree_nothing (file, node, indent) | |
109 | FILE *file ATTRIBUTE_UNUSED; | |
110 | tree node ATTRIBUTE_UNUSED; | |
111 | int indent ATTRIBUTE_UNUSED; | |
112 | { | |
ac79cd5a RK |
113 | } |
114 | ||
115 | /* Called from safe_from_p. */ | |
116 | ||
117 | int | |
118 | lhd_safe_from_p (x, exp) | |
f80230c1 RK |
119 | rtx x ATTRIBUTE_UNUSED; |
120 | tree exp ATTRIBUTE_UNUSED; | |
ac79cd5a RK |
121 | { |
122 | return 1; | |
d062a680 JM |
123 | } |
124 | ||
48a7a235 NB |
125 | /* Called from unsafe_for_reeval. */ |
126 | ||
127 | int | |
128 | lhd_unsafe_for_reeval (t) | |
129 | tree t ATTRIBUTE_UNUSED; | |
130 | { | |
131 | return -1; | |
132 | } | |
133 | ||
d062a680 JM |
134 | /* Called from staticp. */ |
135 | ||
136 | int | |
137 | lhd_staticp (exp) | |
990290e8 | 138 | tree exp ATTRIBUTE_UNUSED; |
d062a680 JM |
139 | { |
140 | return 0; | |
5d69f816 NB |
141 | } |
142 | ||
ef4f94ac RH |
143 | /* Called from check_global_declarations. */ |
144 | ||
145 | bool | |
146 | lhd_warn_unused_global_decl (decl) | |
147 | tree decl; | |
148 | { | |
149 | /* This is what used to exist in check_global_declarations. Probably | |
150 | not many of these actually apply to non-C languages. */ | |
151 | ||
152 | if (TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl)) | |
153 | return false; | |
154 | if (TREE_CODE (decl) == VAR_DECL && TREE_READONLY (decl)) | |
155 | return false; | |
156 | if (DECL_IN_SYSTEM_HEADER (decl)) | |
157 | return false; | |
158 | ||
159 | return true; | |
160 | } | |
161 | ||
599bba86 NB |
162 | /* Set the DECL_ASSEMBLER_NAME for DECL. */ |
163 | void | |
164 | lhd_set_decl_assembler_name (decl) | |
165 | tree decl; | |
166 | { | |
167 | /* The language-independent code should never use the | |
168 | DECL_ASSEMBLER_NAME for lots of DECLs. Only FUNCTION_DECLs and | |
169 | VAR_DECLs for variables with static storage duration need a real | |
170 | DECL_ASSEMBLER_NAME. */ | |
171 | if (TREE_CODE (decl) == FUNCTION_DECL | |
e11e816e KH |
172 | || (TREE_CODE (decl) == VAR_DECL |
173 | && (TREE_STATIC (decl) | |
174 | || DECL_EXTERNAL (decl) | |
599bba86 NB |
175 | || TREE_PUBLIC (decl)))) |
176 | /* By default, assume the name to use in assembly code is the | |
177 | same as that used in the source language. (That's correct | |
178 | for C, and GCC used to set DECL_ASSEMBLER_NAME to the same | |
179 | value as DECL_NAME in build_decl, so this choice provides | |
180 | backwards compatibility with existing front-ends. */ | |
181 | SET_DECL_ASSEMBLER_NAME (decl, DECL_NAME (decl)); | |
182 | else | |
183 | /* Nobody should ever be asking for the DECL_ASSEMBLER_NAME of | |
184 | these DECLs -- unless they're in language-dependent code, in | |
185 | which case set_decl_assembler_name hook should handle things. */ | |
186 | abort (); | |
187 | } | |
188 | ||
57ce46bb TT |
189 | /* By default we always allow bit-field based optimizations. */ |
190 | bool | |
191 | lhd_can_use_bit_fields_p () | |
192 | { | |
193 | return true; | |
194 | } | |
195 | ||
37207ee7 ZW |
196 | /* Provide a default routine to clear the binding stack. This is used |
197 | by languages that don't need to do anything special. */ | |
198 | void | |
d23c55c2 | 199 | lhd_clear_binding_stack () |
37207ee7 | 200 | { |
43577e6b | 201 | while (! (*lang_hooks.decls.global_bindings_p) ()) |
37207ee7 ZW |
202 | poplevel (0, 0, 0); |
203 | } | |
204 | ||
ab393bf1 NB |
205 | /* Type promotion for variable arguments. */ |
206 | tree | |
207 | lhd_type_promotes_to (type) | |
208 | tree type ATTRIBUTE_UNUSED; | |
209 | { | |
210 | abort (); | |
211 | } | |
212 | ||
7a228918 NB |
213 | /* Invalid use of an incomplete type. */ |
214 | void | |
215 | lhd_incomplete_type_error (value, type) | |
216 | tree value ATTRIBUTE_UNUSED, type; | |
217 | { | |
218 | if (TREE_CODE (type) == ERROR_MARK) | |
219 | return; | |
220 | ||
221 | abort (); | |
222 | } | |
223 | ||
37207ee7 ZW |
224 | /* Provide a default routine for alias sets that always returns -1. This |
225 | is used by languages that don't need to do anything special. */ | |
226 | ||
227 | HOST_WIDE_INT | |
d23c55c2 | 228 | lhd_get_alias_set (t) |
37207ee7 ZW |
229 | tree t ATTRIBUTE_UNUSED; |
230 | { | |
231 | return -1; | |
232 | } | |
233 | ||
8ac61af7 RK |
234 | /* Provide a hook routine for alias sets that always returns 0. This is |
235 | used by languages that haven't deal with alias sets yet. */ | |
236 | ||
237 | HOST_WIDE_INT | |
238 | hook_get_alias_set_0 (t) | |
239 | tree t ATTRIBUTE_UNUSED; | |
240 | { | |
241 | return 0; | |
242 | } | |
243 | ||
c9d892a8 NB |
244 | /* This is the default expand_expr function. */ |
245 | ||
246 | rtx | |
247 | lhd_expand_expr (t, r, mm, em) | |
248 | tree t ATTRIBUTE_UNUSED; | |
249 | rtx r ATTRIBUTE_UNUSED; | |
250 | enum machine_mode mm ATTRIBUTE_UNUSED; | |
251 | int em ATTRIBUTE_UNUSED; | |
252 | { | |
253 | abort (); | |
254 | } | |
255 | ||
7afff7cf NB |
256 | /* This is the default decl_printable_name function. */ |
257 | ||
258 | const char * | |
259 | lhd_decl_printable_name (decl, verbosity) | |
260 | tree decl; | |
261 | int verbosity ATTRIBUTE_UNUSED; | |
262 | { | |
263 | return IDENTIFIER_POINTER (DECL_NAME (decl)); | |
264 | } | |
265 | ||
69dcadff AO |
266 | /* lang_hooks.tree_inlining.walk_subtrees is called by walk_tree() |
267 | after handling common cases, but before walking code-specific | |
268 | sub-trees. If this hook is overridden for a language, it should | |
269 | handle language-specific tree codes, as well as language-specific | |
270 | information associated to common tree codes. If a tree node is | |
271 | completely handled within this function, it should set *SUBTREES to | |
272 | 0, so that generic handling isn't attempted. For language-specific | |
273 | tree codes, generic handling would abort(), so make sure it is set | |
cc2902df | 274 | properly. Both SUBTREES and *SUBTREES is guaranteed to be nonzero |
69dcadff AO |
275 | when the function is called. */ |
276 | ||
277 | tree | |
d23c55c2 | 278 | lhd_tree_inlining_walk_subtrees (tp,subtrees,func,data,htab) |
69dcadff AO |
279 | tree *tp ATTRIBUTE_UNUSED; |
280 | int *subtrees ATTRIBUTE_UNUSED; | |
281 | walk_tree_fn func ATTRIBUTE_UNUSED; | |
282 | void *data ATTRIBUTE_UNUSED; | |
283 | void *htab ATTRIBUTE_UNUSED; | |
284 | { | |
285 | return NULL_TREE; | |
286 | } | |
287 | ||
288 | /* lang_hooks.tree_inlining.cannot_inline_tree_fn is called to | |
289 | determine whether there are language-specific reasons for not | |
290 | inlining a given function. */ | |
291 | ||
292 | int | |
d23c55c2 | 293 | lhd_tree_inlining_cannot_inline_tree_fn (fnp) |
6aa77e6c | 294 | tree *fnp; |
69dcadff | 295 | { |
2cb921f4 | 296 | if (flag_really_no_inline |
6aa77e6c AH |
297 | && lookup_attribute ("always_inline", DECL_ATTRIBUTES (*fnp)) == NULL) |
298 | return 1; | |
299 | ||
69dcadff AO |
300 | return 0; |
301 | } | |
302 | ||
303 | /* lang_hooks.tree_inlining.disregard_inline_limits is called to | |
304 | determine whether a function should be considered for inlining even | |
305 | if it would exceed inlining limits. */ | |
306 | ||
307 | int | |
d23c55c2 | 308 | lhd_tree_inlining_disregard_inline_limits (fn) |
6aa77e6c | 309 | tree fn; |
69dcadff | 310 | { |
6aa77e6c AH |
311 | if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)) != NULL) |
312 | return 1; | |
313 | ||
69dcadff AO |
314 | return 0; |
315 | } | |
316 | ||
317 | /* lang_hooks.tree_inlining.add_pending_fn_decls is called before | |
318 | starting to inline a function, to push any language-specific | |
319 | functions that should not be inlined into the current function, | |
320 | into VAFNP. PFN is the top of varray, and should be returned if no | |
321 | functions are pushed into VAFNP. The top of the varray should be | |
322 | returned. */ | |
323 | ||
324 | tree | |
d23c55c2 | 325 | lhd_tree_inlining_add_pending_fn_decls (vafnp, pfn) |
69dcadff AO |
326 | void *vafnp ATTRIBUTE_UNUSED; |
327 | tree pfn; | |
328 | { | |
329 | return pfn; | |
330 | } | |
331 | ||
332 | /* lang_hooks.tree_inlining.tree_chain_matters_p indicates whether the | |
333 | TREE_CHAIN of a language-specific tree node is relevant, i.e., | |
334 | whether it should be walked, copied and preserved across copies. */ | |
335 | ||
336 | int | |
d23c55c2 | 337 | lhd_tree_inlining_tree_chain_matters_p (t) |
69dcadff AO |
338 | tree t ATTRIBUTE_UNUSED; |
339 | { | |
340 | return 0; | |
341 | } | |
342 | ||
343 | /* lang_hooks.tree_inlining.auto_var_in_fn_p is called to determine | |
344 | whether VT is an automatic variable defined in function FT. */ | |
345 | ||
346 | int | |
d23c55c2 | 347 | lhd_tree_inlining_auto_var_in_fn_p (var, fn) |
69dcadff AO |
348 | tree var, fn; |
349 | { | |
350 | return (DECL_P (var) && DECL_CONTEXT (var) == fn | |
351 | && (((TREE_CODE (var) == VAR_DECL || TREE_CODE (var) == PARM_DECL) | |
352 | && ! TREE_STATIC (var)) | |
353 | || TREE_CODE (var) == LABEL_DECL | |
354 | || TREE_CODE (var) == RESULT_DECL)); | |
355 | } | |
356 | ||
357 | /* lang_hooks.tree_inlining.copy_res_decl_for_inlining should return a | |
358 | declaration for the result RES of function FN to be inlined into | |
359 | CALLER. NDP points to an integer that should be set in case a new | |
360 | declaration wasn't created (presumably because RES was of aggregate | |
361 | type, such that a TARGET_EXPR is used for the result). TEXPS is a | |
362 | pointer to a varray with the stack of TARGET_EXPRs seen while | |
363 | inlining functions into caller; the top of TEXPS is supposed to | |
364 | match RES. */ | |
365 | ||
366 | tree | |
d23c55c2 | 367 | lhd_tree_inlining_copy_res_decl_for_inlining (res, fn, caller, |
4977bab6 | 368 | dm, ndp, return_slot_addr) |
69dcadff AO |
369 | tree res, fn, caller; |
370 | void *dm ATTRIBUTE_UNUSED; | |
371 | int *ndp ATTRIBUTE_UNUSED; | |
4977bab6 | 372 | tree return_slot_addr ATTRIBUTE_UNUSED; |
69dcadff | 373 | { |
4977bab6 ZW |
374 | if (return_slot_addr) |
375 | return build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (return_slot_addr)), | |
376 | return_slot_addr); | |
377 | else | |
378 | return copy_decl_for_inlining (res, fn, caller); | |
69dcadff AO |
379 | } |
380 | ||
381 | /* lang_hooks.tree_inlining.anon_aggr_type_p determines whether T is a | |
382 | type node representing an anonymous aggregate (union, struct, etc), | |
383 | i.e., one whose members are in the same scope as the union itself. */ | |
384 | ||
385 | int | |
d23c55c2 | 386 | lhd_tree_inlining_anon_aggr_type_p (t) |
69dcadff AO |
387 | tree t ATTRIBUTE_UNUSED; |
388 | { | |
389 | return 0; | |
390 | } | |
391 | ||
742a37d5 JM |
392 | /* lang_hooks.tree_inlining.start_inlining and end_inlining perform any |
393 | language-specific bookkeeping necessary for processing | |
cc2902df | 394 | FN. start_inlining returns nonzero if inlining should proceed, zero if |
742a37d5 JM |
395 | not. |
396 | ||
397 | For instance, the C++ version keeps track of template instantiations to | |
398 | avoid infinite recursion. */ | |
399 | ||
400 | int | |
401 | lhd_tree_inlining_start_inlining (fn) | |
402 | tree fn ATTRIBUTE_UNUSED; | |
403 | { | |
404 | return 1; | |
405 | } | |
406 | ||
407 | void | |
408 | lhd_tree_inlining_end_inlining (fn) | |
409 | tree fn ATTRIBUTE_UNUSED; | |
410 | { | |
411 | } | |
412 | ||
f735a153 JJ |
413 | /* lang_hooks.tree_inlining.convert_parm_for_inlining performs any |
414 | language-specific conversion before assigning VALUE to PARM. */ | |
415 | ||
416 | tree | |
417 | lhd_tree_inlining_convert_parm_for_inlining (parm, value, fndecl) | |
418 | tree parm ATTRIBUTE_UNUSED; | |
419 | tree value; | |
420 | tree fndecl ATTRIBUTE_UNUSED; | |
421 | { | |
422 | return value; | |
423 | } | |
424 | ||
e11e816e | 425 | /* lang_hooks.tree_dump.dump_tree: Dump language-specific parts of tree |
cc2902df | 426 | nodes. Returns nonzero if it does not want the usual dumping of the |
89d684bb BM |
427 | second argument. */ |
428 | ||
429 | int | |
430 | lhd_tree_dump_dump_tree (di, t) | |
431 | void *di ATTRIBUTE_UNUSED; | |
432 | tree t ATTRIBUTE_UNUSED; | |
433 | { | |
434 | return 0; | |
435 | } | |
436 | ||
e11e816e | 437 | /* lang_hooks.tree_dump.type_qual: Determine type qualifiers in a |
89d684bb BM |
438 | language-specific way. */ |
439 | ||
440 | int | |
441 | lhd_tree_dump_type_quals (t) | |
442 | tree t; | |
443 | { | |
444 | return TYPE_QUALS (t); | |
445 | } | |
a77a9a18 JM |
446 | |
447 | /* lang_hooks.expr_size: Determine the size of the value of an expression T | |
448 | in a language-specific way. Returns a tree for the size in bytes. */ | |
449 | ||
450 | tree | |
451 | lhd_expr_size (exp) | |
452 | tree exp; | |
453 | { | |
454 | if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'd' | |
455 | && DECL_SIZE_UNIT (exp) != 0) | |
456 | return DECL_SIZE_UNIT (exp); | |
457 | else | |
458 | return size_in_bytes (TREE_TYPE (exp)); | |
459 | } | |
2f51bb1d MA |
460 | |
461 | /* lang_hooks.decls.final_write_globals: perform final processing on | |
3dc575ff | 462 | global variables. */ |
2f51bb1d MA |
463 | void |
464 | write_global_declarations () | |
465 | { | |
466 | /* Really define vars that have had only a tentative definition. | |
467 | Really output inline functions that must actually be callable | |
468 | and have not been output so far. */ | |
469 | ||
470 | tree globals = (*lang_hooks.decls.getdecls) (); | |
471 | int len = list_length (globals); | |
472 | tree *vec = (tree *) xmalloc (sizeof (tree) * len); | |
473 | int i; | |
474 | tree decl; | |
475 | ||
476 | /* Process the decls in reverse order--earliest first. | |
477 | Put them into VEC from back to front, then take out from front. */ | |
478 | ||
479 | for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl)) | |
480 | vec[len - i - 1] = decl; | |
481 | ||
482 | wrapup_global_declarations (vec, len); | |
483 | ||
484 | check_global_declarations (vec, len); | |
485 | ||
486 | /* Clean up. */ | |
487 | free (vec); | |
488 | } |