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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 | |
5d69f816 NB |
96 | /* Called from by print-tree.c. */ |
97 | ||
98 | void | |
99 | lhd_print_tree_nothing (file, node, indent) | |
100 | FILE *file ATTRIBUTE_UNUSED; | |
101 | tree node ATTRIBUTE_UNUSED; | |
102 | int indent ATTRIBUTE_UNUSED; | |
103 | { | |
ac79cd5a RK |
104 | } |
105 | ||
106 | /* Called from safe_from_p. */ | |
107 | ||
108 | int | |
109 | lhd_safe_from_p (x, exp) | |
f80230c1 RK |
110 | rtx x ATTRIBUTE_UNUSED; |
111 | tree exp ATTRIBUTE_UNUSED; | |
ac79cd5a RK |
112 | { |
113 | return 1; | |
d062a680 JM |
114 | } |
115 | ||
48a7a235 NB |
116 | /* Called from unsafe_for_reeval. */ |
117 | ||
118 | int | |
119 | lhd_unsafe_for_reeval (t) | |
120 | tree t ATTRIBUTE_UNUSED; | |
121 | { | |
122 | return -1; | |
123 | } | |
124 | ||
d062a680 JM |
125 | /* Called from staticp. */ |
126 | ||
127 | int | |
128 | lhd_staticp (exp) | |
990290e8 | 129 | tree exp ATTRIBUTE_UNUSED; |
d062a680 JM |
130 | { |
131 | return 0; | |
5d69f816 NB |
132 | } |
133 | ||
ef4f94ac RH |
134 | /* Called from check_global_declarations. */ |
135 | ||
136 | bool | |
137 | lhd_warn_unused_global_decl (decl) | |
138 | tree decl; | |
139 | { | |
140 | /* This is what used to exist in check_global_declarations. Probably | |
141 | not many of these actually apply to non-C languages. */ | |
142 | ||
143 | if (TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl)) | |
144 | return false; | |
145 | if (TREE_CODE (decl) == VAR_DECL && TREE_READONLY (decl)) | |
146 | return false; | |
147 | if (DECL_IN_SYSTEM_HEADER (decl)) | |
148 | return false; | |
149 | ||
150 | return true; | |
151 | } | |
152 | ||
599bba86 NB |
153 | /* Set the DECL_ASSEMBLER_NAME for DECL. */ |
154 | void | |
155 | lhd_set_decl_assembler_name (decl) | |
156 | tree decl; | |
157 | { | |
158 | /* The language-independent code should never use the | |
159 | DECL_ASSEMBLER_NAME for lots of DECLs. Only FUNCTION_DECLs and | |
160 | VAR_DECLs for variables with static storage duration need a real | |
161 | DECL_ASSEMBLER_NAME. */ | |
162 | if (TREE_CODE (decl) == FUNCTION_DECL | |
e11e816e KH |
163 | || (TREE_CODE (decl) == VAR_DECL |
164 | && (TREE_STATIC (decl) | |
165 | || DECL_EXTERNAL (decl) | |
599bba86 NB |
166 | || TREE_PUBLIC (decl)))) |
167 | /* By default, assume the name to use in assembly code is the | |
168 | same as that used in the source language. (That's correct | |
169 | for C, and GCC used to set DECL_ASSEMBLER_NAME to the same | |
170 | value as DECL_NAME in build_decl, so this choice provides | |
171 | backwards compatibility with existing front-ends. */ | |
172 | SET_DECL_ASSEMBLER_NAME (decl, DECL_NAME (decl)); | |
173 | else | |
174 | /* Nobody should ever be asking for the DECL_ASSEMBLER_NAME of | |
175 | these DECLs -- unless they're in language-dependent code, in | |
176 | which case set_decl_assembler_name hook should handle things. */ | |
177 | abort (); | |
178 | } | |
179 | ||
57ce46bb TT |
180 | /* By default we always allow bit-field based optimizations. */ |
181 | bool | |
182 | lhd_can_use_bit_fields_p () | |
183 | { | |
184 | return true; | |
185 | } | |
186 | ||
37207ee7 ZW |
187 | /* Provide a default routine to clear the binding stack. This is used |
188 | by languages that don't need to do anything special. */ | |
189 | void | |
d23c55c2 | 190 | lhd_clear_binding_stack () |
37207ee7 | 191 | { |
43577e6b | 192 | while (! (*lang_hooks.decls.global_bindings_p) ()) |
37207ee7 ZW |
193 | poplevel (0, 0, 0); |
194 | } | |
195 | ||
ab393bf1 NB |
196 | /* Type promotion for variable arguments. */ |
197 | tree | |
198 | lhd_type_promotes_to (type) | |
199 | tree type ATTRIBUTE_UNUSED; | |
200 | { | |
201 | abort (); | |
202 | } | |
203 | ||
7a228918 NB |
204 | /* Invalid use of an incomplete type. */ |
205 | void | |
206 | lhd_incomplete_type_error (value, type) | |
207 | tree value ATTRIBUTE_UNUSED, type; | |
208 | { | |
209 | if (TREE_CODE (type) == ERROR_MARK) | |
210 | return; | |
211 | ||
212 | abort (); | |
213 | } | |
214 | ||
37207ee7 ZW |
215 | /* Provide a default routine for alias sets that always returns -1. This |
216 | is used by languages that don't need to do anything special. */ | |
217 | ||
218 | HOST_WIDE_INT | |
d23c55c2 | 219 | lhd_get_alias_set (t) |
37207ee7 ZW |
220 | tree t ATTRIBUTE_UNUSED; |
221 | { | |
222 | return -1; | |
223 | } | |
224 | ||
8ac61af7 RK |
225 | /* Provide a hook routine for alias sets that always returns 0. This is |
226 | used by languages that haven't deal with alias sets yet. */ | |
227 | ||
228 | HOST_WIDE_INT | |
229 | hook_get_alias_set_0 (t) | |
230 | tree t ATTRIBUTE_UNUSED; | |
231 | { | |
232 | return 0; | |
233 | } | |
234 | ||
c9d892a8 NB |
235 | /* This is the default expand_expr function. */ |
236 | ||
237 | rtx | |
238 | lhd_expand_expr (t, r, mm, em) | |
239 | tree t ATTRIBUTE_UNUSED; | |
240 | rtx r ATTRIBUTE_UNUSED; | |
241 | enum machine_mode mm ATTRIBUTE_UNUSED; | |
242 | int em ATTRIBUTE_UNUSED; | |
243 | { | |
244 | abort (); | |
245 | } | |
246 | ||
7afff7cf NB |
247 | /* This is the default decl_printable_name function. */ |
248 | ||
249 | const char * | |
250 | lhd_decl_printable_name (decl, verbosity) | |
251 | tree decl; | |
252 | int verbosity ATTRIBUTE_UNUSED; | |
253 | { | |
254 | return IDENTIFIER_POINTER (DECL_NAME (decl)); | |
255 | } | |
256 | ||
69dcadff AO |
257 | /* lang_hooks.tree_inlining.walk_subtrees is called by walk_tree() |
258 | after handling common cases, but before walking code-specific | |
259 | sub-trees. If this hook is overridden for a language, it should | |
260 | handle language-specific tree codes, as well as language-specific | |
261 | information associated to common tree codes. If a tree node is | |
262 | completely handled within this function, it should set *SUBTREES to | |
263 | 0, so that generic handling isn't attempted. For language-specific | |
264 | tree codes, generic handling would abort(), so make sure it is set | |
cc2902df | 265 | properly. Both SUBTREES and *SUBTREES is guaranteed to be nonzero |
69dcadff AO |
266 | when the function is called. */ |
267 | ||
268 | tree | |
d23c55c2 | 269 | lhd_tree_inlining_walk_subtrees (tp,subtrees,func,data,htab) |
69dcadff AO |
270 | tree *tp ATTRIBUTE_UNUSED; |
271 | int *subtrees ATTRIBUTE_UNUSED; | |
272 | walk_tree_fn func ATTRIBUTE_UNUSED; | |
273 | void *data ATTRIBUTE_UNUSED; | |
274 | void *htab ATTRIBUTE_UNUSED; | |
275 | { | |
276 | return NULL_TREE; | |
277 | } | |
278 | ||
279 | /* lang_hooks.tree_inlining.cannot_inline_tree_fn is called to | |
280 | determine whether there are language-specific reasons for not | |
281 | inlining a given function. */ | |
282 | ||
283 | int | |
d23c55c2 | 284 | lhd_tree_inlining_cannot_inline_tree_fn (fnp) |
6aa77e6c | 285 | tree *fnp; |
69dcadff | 286 | { |
2cb921f4 | 287 | if (flag_really_no_inline |
6aa77e6c AH |
288 | && lookup_attribute ("always_inline", DECL_ATTRIBUTES (*fnp)) == NULL) |
289 | return 1; | |
290 | ||
69dcadff AO |
291 | return 0; |
292 | } | |
293 | ||
294 | /* lang_hooks.tree_inlining.disregard_inline_limits is called to | |
295 | determine whether a function should be considered for inlining even | |
296 | if it would exceed inlining limits. */ | |
297 | ||
298 | int | |
d23c55c2 | 299 | lhd_tree_inlining_disregard_inline_limits (fn) |
6aa77e6c | 300 | tree fn; |
69dcadff | 301 | { |
6aa77e6c AH |
302 | if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)) != NULL) |
303 | return 1; | |
304 | ||
69dcadff AO |
305 | return 0; |
306 | } | |
307 | ||
308 | /* lang_hooks.tree_inlining.add_pending_fn_decls is called before | |
309 | starting to inline a function, to push any language-specific | |
310 | functions that should not be inlined into the current function, | |
311 | into VAFNP. PFN is the top of varray, and should be returned if no | |
312 | functions are pushed into VAFNP. The top of the varray should be | |
313 | returned. */ | |
314 | ||
315 | tree | |
d23c55c2 | 316 | lhd_tree_inlining_add_pending_fn_decls (vafnp, pfn) |
69dcadff AO |
317 | void *vafnp ATTRIBUTE_UNUSED; |
318 | tree pfn; | |
319 | { | |
320 | return pfn; | |
321 | } | |
322 | ||
323 | /* lang_hooks.tree_inlining.tree_chain_matters_p indicates whether the | |
324 | TREE_CHAIN of a language-specific tree node is relevant, i.e., | |
325 | whether it should be walked, copied and preserved across copies. */ | |
326 | ||
327 | int | |
d23c55c2 | 328 | lhd_tree_inlining_tree_chain_matters_p (t) |
69dcadff AO |
329 | tree t ATTRIBUTE_UNUSED; |
330 | { | |
331 | return 0; | |
332 | } | |
333 | ||
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. */ | |
336 | ||
337 | int | |
d23c55c2 | 338 | lhd_tree_inlining_auto_var_in_fn_p (var, fn) |
69dcadff AO |
339 | tree var, fn; |
340 | { | |
341 | return (DECL_P (var) && DECL_CONTEXT (var) == fn | |
342 | && (((TREE_CODE (var) == VAR_DECL || TREE_CODE (var) == PARM_DECL) | |
343 | && ! TREE_STATIC (var)) | |
344 | || TREE_CODE (var) == LABEL_DECL | |
345 | || TREE_CODE (var) == RESULT_DECL)); | |
346 | } | |
347 | ||
348 | /* lang_hooks.tree_inlining.copy_res_decl_for_inlining should return a | |
349 | declaration for the result RES of function FN to be inlined into | |
350 | CALLER. NDP points to an integer that should be set in case a new | |
351 | declaration wasn't created (presumably because RES was of aggregate | |
352 | type, such that a TARGET_EXPR is used for the result). TEXPS is a | |
353 | pointer to a varray with the stack of TARGET_EXPRs seen while | |
354 | inlining functions into caller; the top of TEXPS is supposed to | |
355 | match RES. */ | |
356 | ||
357 | tree | |
d23c55c2 | 358 | lhd_tree_inlining_copy_res_decl_for_inlining (res, fn, caller, |
4977bab6 | 359 | dm, ndp, return_slot_addr) |
69dcadff AO |
360 | tree res, fn, caller; |
361 | void *dm ATTRIBUTE_UNUSED; | |
362 | int *ndp ATTRIBUTE_UNUSED; | |
4977bab6 | 363 | tree return_slot_addr ATTRIBUTE_UNUSED; |
69dcadff | 364 | { |
4977bab6 ZW |
365 | if (return_slot_addr) |
366 | return build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (return_slot_addr)), | |
367 | return_slot_addr); | |
368 | else | |
369 | return copy_decl_for_inlining (res, fn, caller); | |
69dcadff AO |
370 | } |
371 | ||
372 | /* lang_hooks.tree_inlining.anon_aggr_type_p determines whether T is a | |
373 | type node representing an anonymous aggregate (union, struct, etc), | |
374 | i.e., one whose members are in the same scope as the union itself. */ | |
375 | ||
376 | int | |
d23c55c2 | 377 | lhd_tree_inlining_anon_aggr_type_p (t) |
69dcadff AO |
378 | tree t ATTRIBUTE_UNUSED; |
379 | { | |
380 | return 0; | |
381 | } | |
382 | ||
742a37d5 JM |
383 | /* lang_hooks.tree_inlining.start_inlining and end_inlining perform any |
384 | language-specific bookkeeping necessary for processing | |
cc2902df | 385 | FN. start_inlining returns nonzero if inlining should proceed, zero if |
742a37d5 JM |
386 | not. |
387 | ||
388 | For instance, the C++ version keeps track of template instantiations to | |
389 | avoid infinite recursion. */ | |
390 | ||
391 | int | |
392 | lhd_tree_inlining_start_inlining (fn) | |
393 | tree fn ATTRIBUTE_UNUSED; | |
394 | { | |
395 | return 1; | |
396 | } | |
397 | ||
398 | void | |
399 | lhd_tree_inlining_end_inlining (fn) | |
400 | tree fn ATTRIBUTE_UNUSED; | |
401 | { | |
402 | } | |
403 | ||
f735a153 JJ |
404 | /* lang_hooks.tree_inlining.convert_parm_for_inlining performs any |
405 | language-specific conversion before assigning VALUE to PARM. */ | |
406 | ||
407 | tree | |
408 | lhd_tree_inlining_convert_parm_for_inlining (parm, value, fndecl) | |
409 | tree parm ATTRIBUTE_UNUSED; | |
410 | tree value; | |
411 | tree fndecl ATTRIBUTE_UNUSED; | |
412 | { | |
413 | return value; | |
414 | } | |
415 | ||
e11e816e | 416 | /* lang_hooks.tree_dump.dump_tree: Dump language-specific parts of tree |
cc2902df | 417 | nodes. Returns nonzero if it does not want the usual dumping of the |
89d684bb BM |
418 | second argument. */ |
419 | ||
420 | int | |
421 | lhd_tree_dump_dump_tree (di, t) | |
422 | void *di ATTRIBUTE_UNUSED; | |
423 | tree t ATTRIBUTE_UNUSED; | |
424 | { | |
425 | return 0; | |
426 | } | |
427 | ||
e11e816e | 428 | /* lang_hooks.tree_dump.type_qual: Determine type qualifiers in a |
89d684bb BM |
429 | language-specific way. */ |
430 | ||
431 | int | |
432 | lhd_tree_dump_type_quals (t) | |
433 | tree t; | |
434 | { | |
435 | return TYPE_QUALS (t); | |
436 | } | |
a77a9a18 JM |
437 | |
438 | /* lang_hooks.expr_size: Determine the size of the value of an expression T | |
439 | in a language-specific way. Returns a tree for the size in bytes. */ | |
440 | ||
441 | tree | |
442 | lhd_expr_size (exp) | |
443 | tree exp; | |
444 | { | |
445 | if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'd' | |
446 | && DECL_SIZE_UNIT (exp) != 0) | |
447 | return DECL_SIZE_UNIT (exp); | |
448 | else | |
449 | return size_in_bytes (TREE_TYPE (exp)); | |
450 | } |