Mercurial > hg > CbC > CbC_gcc
comparison gcc/cp/decl2.c @ 111:04ced10e8804
gcc 7
author | kono |
---|---|
date | Fri, 27 Oct 2017 22:46:09 +0900 |
parents | |
children | 84e7813d76e9 |
comparison
equal
deleted
inserted
replaced
68:561a7518be6b | 111:04ced10e8804 |
---|---|
1 /* Process declarations and variables for C++ compiler. | |
2 Copyright (C) 1988-2017 Free Software Foundation, Inc. | |
3 Hacked by Michael Tiemann (tiemann@cygnus.com) | |
4 | |
5 This file is part of GCC. | |
6 | |
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 3, or (at your option) | |
10 any later version. | |
11 | |
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. | |
16 | |
17 You should have received a copy of the GNU General Public License | |
18 along with GCC; see the file COPYING3. If not see | |
19 <http://www.gnu.org/licenses/>. */ | |
20 | |
21 | |
22 /* Process declarations and symbol lookup for C++ front end. | |
23 Also constructs types; the standard scalar types at initialization, | |
24 and structure, union, array and enum types when they are declared. */ | |
25 | |
26 /* ??? not all decl nodes are given the most useful possible | |
27 line numbers. For example, the CONST_DECLs for enum values. */ | |
28 | |
29 #include "config.h" | |
30 #include "system.h" | |
31 #include "coretypes.h" | |
32 #include "memmodel.h" | |
33 #include "target.h" | |
34 #include "cp-tree.h" | |
35 #include "c-family/c-common.h" | |
36 #include "timevar.h" | |
37 #include "stringpool.h" | |
38 #include "cgraph.h" | |
39 #include "varasm.h" | |
40 #include "attribs.h" | |
41 #include "stor-layout.h" | |
42 #include "calls.h" | |
43 #include "decl.h" | |
44 #include "toplev.h" | |
45 #include "c-family/c-objc.h" | |
46 #include "c-family/c-pragma.h" | |
47 #include "dumpfile.h" | |
48 #include "intl.h" | |
49 #include "c-family/c-ada-spec.h" | |
50 #include "asan.h" | |
51 | |
52 /* Id for dumping the raw trees. */ | |
53 int raw_dump_id; | |
54 | |
55 extern cpp_reader *parse_in; | |
56 | |
57 /* This structure contains information about the initializations | |
58 and/or destructions required for a particular priority level. */ | |
59 typedef struct priority_info_s { | |
60 /* Nonzero if there have been any initializations at this priority | |
61 throughout the translation unit. */ | |
62 int initializations_p; | |
63 /* Nonzero if there have been any destructions at this priority | |
64 throughout the translation unit. */ | |
65 int destructions_p; | |
66 } *priority_info; | |
67 | |
68 static void mark_vtable_entries (tree); | |
69 static bool maybe_emit_vtables (tree); | |
70 static tree start_objects (int, int); | |
71 static void finish_objects (int, int, tree); | |
72 static tree start_static_storage_duration_function (unsigned); | |
73 static void finish_static_storage_duration_function (tree); | |
74 static priority_info get_priority_info (int); | |
75 static void do_static_initialization_or_destruction (tree, bool); | |
76 static void one_static_initialization_or_destruction (tree, tree, bool); | |
77 static void generate_ctor_or_dtor_function (bool, int, location_t *); | |
78 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node, | |
79 void *); | |
80 static tree prune_vars_needing_no_initialization (tree *); | |
81 static void write_out_vars (tree); | |
82 static void import_export_class (tree); | |
83 static tree get_guard_bits (tree); | |
84 static void determine_visibility_from_class (tree, tree); | |
85 static bool determine_hidden_inline (tree); | |
86 static void maybe_instantiate_decl (tree); | |
87 | |
88 /* A list of static class variables. This is needed, because a | |
89 static class variable can be declared inside the class without | |
90 an initializer, and then initialized, statically, outside the class. */ | |
91 static GTY(()) vec<tree, va_gc> *pending_statics; | |
92 | |
93 /* A list of functions which were declared inline, but which we | |
94 may need to emit outline anyway. */ | |
95 static GTY(()) vec<tree, va_gc> *deferred_fns; | |
96 | |
97 /* A list of decls that use types with no linkage, which we need to make | |
98 sure are defined. */ | |
99 static GTY(()) vec<tree, va_gc> *no_linkage_decls; | |
100 | |
101 /* A vector of alternating decls and identifiers, where the latter | |
102 is to be an alias for the former if the former is defined. */ | |
103 static GTY(()) vec<tree, va_gc> *mangling_aliases; | |
104 | |
105 /* hash traits for declarations. Hashes single decls via | |
106 DECL_ASSEMBLER_NAME_RAW. */ | |
107 | |
108 struct mangled_decl_hash : ggc_remove <tree> | |
109 { | |
110 typedef tree value_type; /* A DECL. */ | |
111 typedef tree compare_type; /* An identifier. */ | |
112 | |
113 static hashval_t hash (const value_type decl) | |
114 { | |
115 return IDENTIFIER_HASH_VALUE (DECL_ASSEMBLER_NAME_RAW (decl)); | |
116 } | |
117 static bool equal (const value_type existing, compare_type candidate) | |
118 { | |
119 tree name = DECL_ASSEMBLER_NAME_RAW (existing); | |
120 return candidate == name; | |
121 } | |
122 | |
123 static inline void mark_empty (value_type &p) {p = NULL_TREE;} | |
124 static inline bool is_empty (value_type p) {return !p;} | |
125 | |
126 /* Nothing is deletable. Everything is insertable. */ | |
127 static bool is_deleted (value_type) { return false; } | |
128 static void mark_deleted (value_type) { gcc_unreachable (); } | |
129 }; | |
130 | |
131 /* A hash table of decls keyed by mangled name. Used to figure out if | |
132 we need compatibility aliases. */ | |
133 static GTY(()) hash_table<mangled_decl_hash> *mangled_decls; | |
134 | |
135 /* Nonzero if we're done parsing and into end-of-file activities. */ | |
136 | |
137 int at_eof; | |
138 | |
139 /* True if note_mangling_alias should enqueue mangling aliases for | |
140 later generation, rather than emitting them right away. */ | |
141 | |
142 bool defer_mangling_aliases = true; | |
143 | |
144 | |
145 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a | |
146 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers | |
147 that apply to the function). */ | |
148 | |
149 tree | |
150 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals, | |
151 cp_ref_qualifier rqual) | |
152 { | |
153 tree raises; | |
154 tree attrs; | |
155 int type_quals; | |
156 bool late_return_type_p; | |
157 | |
158 if (fntype == error_mark_node || ctype == error_mark_node) | |
159 return error_mark_node; | |
160 | |
161 gcc_assert (TREE_CODE (fntype) == FUNCTION_TYPE | |
162 || TREE_CODE (fntype) == METHOD_TYPE); | |
163 | |
164 type_quals = quals & ~TYPE_QUAL_RESTRICT; | |
165 ctype = cp_build_qualified_type (ctype, type_quals); | |
166 raises = TYPE_RAISES_EXCEPTIONS (fntype); | |
167 attrs = TYPE_ATTRIBUTES (fntype); | |
168 late_return_type_p = TYPE_HAS_LATE_RETURN_TYPE (fntype); | |
169 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype), | |
170 (TREE_CODE (fntype) == METHOD_TYPE | |
171 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype)) | |
172 : TYPE_ARG_TYPES (fntype))); | |
173 if (attrs) | |
174 fntype = cp_build_type_attribute_variant (fntype, attrs); | |
175 if (rqual) | |
176 fntype = build_ref_qualified_type (fntype, rqual); | |
177 if (raises) | |
178 fntype = build_exception_variant (fntype, raises); | |
179 if (late_return_type_p) | |
180 TYPE_HAS_LATE_RETURN_TYPE (fntype) = 1; | |
181 | |
182 return fntype; | |
183 } | |
184 | |
185 /* Return a variant of FNTYPE, a FUNCTION_TYPE or METHOD_TYPE, with its | |
186 return type changed to NEW_RET. */ | |
187 | |
188 tree | |
189 change_return_type (tree new_ret, tree fntype) | |
190 { | |
191 tree newtype; | |
192 tree args = TYPE_ARG_TYPES (fntype); | |
193 tree raises = TYPE_RAISES_EXCEPTIONS (fntype); | |
194 tree attrs = TYPE_ATTRIBUTES (fntype); | |
195 bool late_return_type_p = TYPE_HAS_LATE_RETURN_TYPE (fntype); | |
196 | |
197 if (new_ret == error_mark_node) | |
198 return fntype; | |
199 | |
200 if (same_type_p (new_ret, TREE_TYPE (fntype))) | |
201 return fntype; | |
202 | |
203 if (TREE_CODE (fntype) == FUNCTION_TYPE) | |
204 { | |
205 newtype = build_function_type (new_ret, args); | |
206 newtype = apply_memfn_quals (newtype, | |
207 type_memfn_quals (fntype), | |
208 type_memfn_rqual (fntype)); | |
209 } | |
210 else | |
211 newtype = build_method_type_directly | |
212 (class_of_this_parm (fntype), new_ret, TREE_CHAIN (args)); | |
213 if (FUNCTION_REF_QUALIFIED (fntype)) | |
214 newtype = build_ref_qualified_type (newtype, type_memfn_rqual (fntype)); | |
215 if (raises) | |
216 newtype = build_exception_variant (newtype, raises); | |
217 if (attrs) | |
218 newtype = cp_build_type_attribute_variant (newtype, attrs); | |
219 if (late_return_type_p) | |
220 TYPE_HAS_LATE_RETURN_TYPE (newtype) = 1; | |
221 | |
222 return newtype; | |
223 } | |
224 | |
225 /* Build a PARM_DECL of FN with NAME and TYPE, and set DECL_ARG_TYPE | |
226 appropriately. */ | |
227 | |
228 tree | |
229 cp_build_parm_decl (tree fn, tree name, tree type) | |
230 { | |
231 tree parm = build_decl (input_location, | |
232 PARM_DECL, name, type); | |
233 DECL_CONTEXT (parm) = fn; | |
234 | |
235 /* DECL_ARG_TYPE is only used by the back end and the back end never | |
236 sees templates. */ | |
237 if (!processing_template_decl) | |
238 DECL_ARG_TYPE (parm) = type_passed_as (type); | |
239 | |
240 return parm; | |
241 } | |
242 | |
243 /* Returns a PARM_DECL of FN for a parameter of the indicated TYPE, with the | |
244 indicated NAME. */ | |
245 | |
246 tree | |
247 build_artificial_parm (tree fn, tree name, tree type) | |
248 { | |
249 tree parm = cp_build_parm_decl (fn, name, type); | |
250 DECL_ARTIFICIAL (parm) = 1; | |
251 /* All our artificial parms are implicitly `const'; they cannot be | |
252 assigned to. */ | |
253 TREE_READONLY (parm) = 1; | |
254 return parm; | |
255 } | |
256 | |
257 /* Constructors for types with virtual baseclasses need an "in-charge" flag | |
258 saying whether this constructor is responsible for initialization of | |
259 virtual baseclasses or not. All destructors also need this "in-charge" | |
260 flag, which additionally determines whether or not the destructor should | |
261 free the memory for the object. | |
262 | |
263 This function adds the "in-charge" flag to member function FN if | |
264 appropriate. It is called from grokclassfn and tsubst. | |
265 FN must be either a constructor or destructor. | |
266 | |
267 The in-charge flag follows the 'this' parameter, and is followed by the | |
268 VTT parm (if any), then the user-written parms. */ | |
269 | |
270 void | |
271 maybe_retrofit_in_chrg (tree fn) | |
272 { | |
273 tree basetype, arg_types, parms, parm, fntype; | |
274 | |
275 /* If we've already add the in-charge parameter don't do it again. */ | |
276 if (DECL_HAS_IN_CHARGE_PARM_P (fn)) | |
277 return; | |
278 | |
279 /* When processing templates we can't know, in general, whether or | |
280 not we're going to have virtual baseclasses. */ | |
281 if (processing_template_decl) | |
282 return; | |
283 | |
284 /* We don't need an in-charge parameter for constructors that don't | |
285 have virtual bases. */ | |
286 if (DECL_CONSTRUCTOR_P (fn) | |
287 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn))) | |
288 return; | |
289 | |
290 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn)); | |
291 basetype = TREE_TYPE (TREE_VALUE (arg_types)); | |
292 arg_types = TREE_CHAIN (arg_types); | |
293 | |
294 parms = DECL_CHAIN (DECL_ARGUMENTS (fn)); | |
295 | |
296 /* If this is a subobject constructor or destructor, our caller will | |
297 pass us a pointer to our VTT. */ | |
298 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn))) | |
299 { | |
300 parm = build_artificial_parm (fn, vtt_parm_identifier, vtt_parm_type); | |
301 | |
302 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */ | |
303 DECL_CHAIN (parm) = parms; | |
304 parms = parm; | |
305 | |
306 /* ...and then to TYPE_ARG_TYPES. */ | |
307 arg_types = hash_tree_chain (vtt_parm_type, arg_types); | |
308 | |
309 DECL_HAS_VTT_PARM_P (fn) = 1; | |
310 } | |
311 | |
312 /* Then add the in-charge parm (before the VTT parm). */ | |
313 parm = build_artificial_parm (fn, in_charge_identifier, integer_type_node); | |
314 DECL_CHAIN (parm) = parms; | |
315 parms = parm; | |
316 arg_types = hash_tree_chain (integer_type_node, arg_types); | |
317 | |
318 /* Insert our new parameter(s) into the list. */ | |
319 DECL_CHAIN (DECL_ARGUMENTS (fn)) = parms; | |
320 | |
321 /* And rebuild the function type. */ | |
322 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)), | |
323 arg_types); | |
324 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))) | |
325 fntype = build_exception_variant (fntype, | |
326 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))); | |
327 if (TYPE_ATTRIBUTES (TREE_TYPE (fn))) | |
328 fntype = (cp_build_type_attribute_variant | |
329 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (fn)))); | |
330 TREE_TYPE (fn) = fntype; | |
331 | |
332 /* Now we've got the in-charge parameter. */ | |
333 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1; | |
334 } | |
335 | |
336 /* Classes overload their constituent function names automatically. | |
337 When a function name is declared in a record structure, | |
338 its name is changed to it overloaded name. Since names for | |
339 constructors and destructors can conflict, we place a leading | |
340 '$' for destructors. | |
341 | |
342 CNAME is the name of the class we are grokking for. | |
343 | |
344 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'. | |
345 | |
346 FLAGS contains bits saying what's special about today's | |
347 arguments. DTOR_FLAG == DESTRUCTOR. | |
348 | |
349 If FUNCTION is a destructor, then we must add the `auto-delete' field | |
350 as a second parameter. There is some hair associated with the fact | |
351 that we must "declare" this variable in the manner consistent with the | |
352 way the rest of the arguments were declared. | |
353 | |
354 QUALS are the qualifiers for the this pointer. */ | |
355 | |
356 void | |
357 grokclassfn (tree ctype, tree function, enum overload_flags flags) | |
358 { | |
359 tree fn_name = DECL_NAME (function); | |
360 | |
361 /* Even within an `extern "C"' block, members get C++ linkage. See | |
362 [dcl.link] for details. */ | |
363 SET_DECL_LANGUAGE (function, lang_cplusplus); | |
364 | |
365 if (fn_name == NULL_TREE) | |
366 { | |
367 error ("name missing for member function"); | |
368 fn_name = get_identifier ("<anonymous>"); | |
369 DECL_NAME (function) = fn_name; | |
370 } | |
371 | |
372 DECL_CONTEXT (function) = ctype; | |
373 | |
374 if (flags == DTOR_FLAG) | |
375 DECL_CXX_DESTRUCTOR_P (function) = 1; | |
376 | |
377 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function)) | |
378 maybe_retrofit_in_chrg (function); | |
379 } | |
380 | |
381 /* Create an ARRAY_REF, checking for the user doing things backwards | |
382 along the way. DECLTYPE_P is for N3276, as in the parser. */ | |
383 | |
384 tree | |
385 grok_array_decl (location_t loc, tree array_expr, tree index_exp, | |
386 bool decltype_p) | |
387 { | |
388 tree type; | |
389 tree expr; | |
390 tree orig_array_expr = array_expr; | |
391 tree orig_index_exp = index_exp; | |
392 tree overload = NULL_TREE; | |
393 | |
394 if (error_operand_p (array_expr) || error_operand_p (index_exp)) | |
395 return error_mark_node; | |
396 | |
397 if (processing_template_decl) | |
398 { | |
399 if (type_dependent_expression_p (array_expr) | |
400 || type_dependent_expression_p (index_exp)) | |
401 return build_min_nt_loc (loc, ARRAY_REF, array_expr, index_exp, | |
402 NULL_TREE, NULL_TREE); | |
403 array_expr = build_non_dependent_expr (array_expr); | |
404 index_exp = build_non_dependent_expr (index_exp); | |
405 } | |
406 | |
407 type = TREE_TYPE (array_expr); | |
408 gcc_assert (type); | |
409 type = non_reference (type); | |
410 | |
411 /* If they have an `operator[]', use that. */ | |
412 if (MAYBE_CLASS_TYPE_P (type) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp))) | |
413 { | |
414 tsubst_flags_t complain = tf_warning_or_error; | |
415 if (decltype_p) | |
416 complain |= tf_decltype; | |
417 expr = build_new_op (loc, ARRAY_REF, LOOKUP_NORMAL, array_expr, | |
418 index_exp, NULL_TREE, &overload, complain); | |
419 } | |
420 else | |
421 { | |
422 tree p1, p2, i1, i2; | |
423 | |
424 /* Otherwise, create an ARRAY_REF for a pointer or array type. | |
425 It is a little-known fact that, if `a' is an array and `i' is | |
426 an int, you can write `i[a]', which means the same thing as | |
427 `a[i]'. */ | |
428 if (TREE_CODE (type) == ARRAY_TYPE || VECTOR_TYPE_P (type)) | |
429 p1 = array_expr; | |
430 else | |
431 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false); | |
432 | |
433 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE) | |
434 p2 = index_exp; | |
435 else | |
436 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false); | |
437 | |
438 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr, | |
439 false); | |
440 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp, | |
441 false); | |
442 | |
443 if ((p1 && i2) && (i1 && p2)) | |
444 error ("ambiguous conversion for array subscript"); | |
445 | |
446 if (p1 && i2) | |
447 array_expr = p1, index_exp = i2; | |
448 else if (i1 && p2) | |
449 array_expr = p2, index_exp = i1; | |
450 else | |
451 { | |
452 error ("invalid types %<%T[%T]%> for array subscript", | |
453 type, TREE_TYPE (index_exp)); | |
454 return error_mark_node; | |
455 } | |
456 | |
457 if (array_expr == error_mark_node || index_exp == error_mark_node) | |
458 error ("ambiguous conversion for array subscript"); | |
459 | |
460 if (TREE_CODE (TREE_TYPE (array_expr)) == POINTER_TYPE) | |
461 array_expr = mark_rvalue_use (array_expr); | |
462 else | |
463 array_expr = mark_lvalue_use_nonread (array_expr); | |
464 index_exp = mark_rvalue_use (index_exp); | |
465 expr = build_array_ref (input_location, array_expr, index_exp); | |
466 } | |
467 if (processing_template_decl && expr != error_mark_node) | |
468 { | |
469 if (overload != NULL_TREE) | |
470 return (build_min_non_dep_op_overload | |
471 (ARRAY_REF, expr, overload, orig_array_expr, orig_index_exp)); | |
472 | |
473 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp, | |
474 NULL_TREE, NULL_TREE); | |
475 } | |
476 return expr; | |
477 } | |
478 | |
479 /* Given the cast expression EXP, checking out its validity. Either return | |
480 an error_mark_node if there was an unavoidable error, return a cast to | |
481 void for trying to delete a pointer w/ the value 0, or return the | |
482 call to delete. If DOING_VEC is true, we handle things differently | |
483 for doing an array delete. | |
484 Implements ARM $5.3.4. This is called from the parser. */ | |
485 | |
486 tree | |
487 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete, | |
488 tsubst_flags_t complain) | |
489 { | |
490 tree t, type; | |
491 | |
492 if (exp == error_mark_node) | |
493 return exp; | |
494 | |
495 if (processing_template_decl) | |
496 { | |
497 t = build_min (DELETE_EXPR, void_type_node, exp, size); | |
498 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete; | |
499 DELETE_EXPR_USE_VEC (t) = doing_vec; | |
500 TREE_SIDE_EFFECTS (t) = 1; | |
501 return t; | |
502 } | |
503 | |
504 /* An array can't have been allocated by new, so complain. */ | |
505 if (TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE) | |
506 warning (0, "deleting array %q#E", exp); | |
507 | |
508 t = build_expr_type_conversion (WANT_POINTER, exp, true); | |
509 | |
510 if (t == NULL_TREE || t == error_mark_node) | |
511 { | |
512 error ("type %q#T argument given to %<delete%>, expected pointer", | |
513 TREE_TYPE (exp)); | |
514 return error_mark_node; | |
515 } | |
516 | |
517 type = TREE_TYPE (t); | |
518 | |
519 /* As of Valley Forge, you can delete a pointer to const. */ | |
520 | |
521 /* You can't delete functions. */ | |
522 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE) | |
523 { | |
524 error ("cannot delete a function. Only pointer-to-objects are " | |
525 "valid arguments to %<delete%>"); | |
526 return error_mark_node; | |
527 } | |
528 | |
529 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */ | |
530 if (VOID_TYPE_P (TREE_TYPE (type))) | |
531 { | |
532 warning (OPT_Wdelete_incomplete, "deleting %qT is undefined", type); | |
533 doing_vec = 0; | |
534 } | |
535 | |
536 /* Deleting a pointer with the value zero is valid and has no effect. */ | |
537 if (integer_zerop (t)) | |
538 return build1 (NOP_EXPR, void_type_node, t); | |
539 | |
540 if (doing_vec) | |
541 return build_vec_delete (t, /*maxindex=*/NULL_TREE, | |
542 sfk_deleting_destructor, | |
543 use_global_delete, complain); | |
544 else | |
545 return build_delete (type, t, sfk_deleting_destructor, | |
546 LOOKUP_NORMAL, use_global_delete, | |
547 complain); | |
548 } | |
549 | |
550 /* Report an error if the indicated template declaration is not the | |
551 sort of thing that should be a member template. */ | |
552 | |
553 void | |
554 check_member_template (tree tmpl) | |
555 { | |
556 tree decl; | |
557 | |
558 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL); | |
559 decl = DECL_TEMPLATE_RESULT (tmpl); | |
560 | |
561 if (TREE_CODE (decl) == FUNCTION_DECL | |
562 || DECL_ALIAS_TEMPLATE_P (tmpl) | |
563 || (TREE_CODE (decl) == TYPE_DECL | |
564 && MAYBE_CLASS_TYPE_P (TREE_TYPE (decl)))) | |
565 { | |
566 /* The parser rejects template declarations in local classes | |
567 (with the exception of generic lambdas). */ | |
568 gcc_assert (!current_function_decl || LAMBDA_FUNCTION_P (decl)); | |
569 /* The parser rejects any use of virtual in a function template. */ | |
570 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL | |
571 && DECL_VIRTUAL_P (decl))); | |
572 | |
573 /* The debug-information generating code doesn't know what to do | |
574 with member templates. */ | |
575 DECL_IGNORED_P (tmpl) = 1; | |
576 } | |
577 else if (variable_template_p (tmpl)) | |
578 /* OK */; | |
579 else | |
580 error ("template declaration of %q#D", decl); | |
581 } | |
582 | |
583 /* Sanity check: report error if this function FUNCTION is not | |
584 really a member of the class (CTYPE) it is supposed to belong to. | |
585 TEMPLATE_PARMS is used to specify the template parameters of a member | |
586 template passed as FUNCTION_DECL. If the member template is passed as a | |
587 TEMPLATE_DECL, it can be NULL since the parameters can be extracted | |
588 from the declaration. If the function is not a function template, it | |
589 must be NULL. | |
590 It returns the original declaration for the function, NULL_TREE if | |
591 no declaration was found, error_mark_node if an error was emitted. */ | |
592 | |
593 tree | |
594 check_classfn (tree ctype, tree function, tree template_parms) | |
595 { | |
596 if (DECL_USE_TEMPLATE (function) | |
597 && !(TREE_CODE (function) == TEMPLATE_DECL | |
598 && DECL_TEMPLATE_SPECIALIZATION (function)) | |
599 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function))) | |
600 /* Since this is a specialization of a member template, | |
601 we're not going to find the declaration in the class. | |
602 For example, in: | |
603 | |
604 struct S { template <typename T> void f(T); }; | |
605 template <> void S::f(int); | |
606 | |
607 we're not going to find `S::f(int)', but there's no | |
608 reason we should, either. We let our callers know we didn't | |
609 find the method, but we don't complain. */ | |
610 return NULL_TREE; | |
611 | |
612 /* Basic sanity check: for a template function, the template parameters | |
613 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */ | |
614 if (TREE_CODE (function) == TEMPLATE_DECL) | |
615 { | |
616 if (template_parms | |
617 && !comp_template_parms (template_parms, | |
618 DECL_TEMPLATE_PARMS (function))) | |
619 { | |
620 error ("template parameter lists provided don%'t match the " | |
621 "template parameters of %qD", function); | |
622 return error_mark_node; | |
623 } | |
624 template_parms = DECL_TEMPLATE_PARMS (function); | |
625 } | |
626 | |
627 /* OK, is this a definition of a member template? */ | |
628 bool is_template = (template_parms != NULL_TREE); | |
629 | |
630 /* [temp.mem] | |
631 | |
632 A destructor shall not be a member template. */ | |
633 if (DECL_DESTRUCTOR_P (function) && is_template) | |
634 { | |
635 error ("destructor %qD declared as member template", function); | |
636 return error_mark_node; | |
637 } | |
638 | |
639 /* We must enter the scope here, because conversion operators are | |
640 named by target type, and type equivalence relies on typenames | |
641 resolving within the scope of CTYPE. */ | |
642 tree pushed_scope = push_scope (ctype); | |
643 tree matched = NULL_TREE; | |
644 tree fns = get_class_binding (ctype, DECL_NAME (function)); | |
645 | |
646 for (ovl_iterator iter (fns); !matched && iter; ++iter) | |
647 { | |
648 tree fndecl = *iter; | |
649 | |
650 /* A member template definition only matches a member template | |
651 declaration. */ | |
652 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL)) | |
653 continue; | |
654 | |
655 if (!DECL_DECLARES_FUNCTION_P (fndecl)) | |
656 continue; | |
657 | |
658 tree p1 = TYPE_ARG_TYPES (TREE_TYPE (function)); | |
659 tree p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl)); | |
660 | |
661 /* We cannot simply call decls_match because this doesn't work | |
662 for static member functions that are pretending to be | |
663 methods, and because the name may have been changed by | |
664 asm("new_name"). */ | |
665 | |
666 /* Get rid of the this parameter on functions that become | |
667 static. */ | |
668 if (DECL_STATIC_FUNCTION_P (fndecl) | |
669 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE) | |
670 p1 = TREE_CHAIN (p1); | |
671 | |
672 /* ref-qualifier or absence of same must match. */ | |
673 if (type_memfn_rqual (TREE_TYPE (function)) | |
674 != type_memfn_rqual (TREE_TYPE (fndecl))) | |
675 continue; | |
676 | |
677 // Include constraints in the match. | |
678 tree c1 = get_constraints (function); | |
679 tree c2 = get_constraints (fndecl); | |
680 | |
681 /* While finding a match, same types and params are not enough | |
682 if the function is versioned. Also check version ("target") | |
683 attributes. */ | |
684 if (same_type_p (TREE_TYPE (TREE_TYPE (function)), | |
685 TREE_TYPE (TREE_TYPE (fndecl))) | |
686 && compparms (p1, p2) | |
687 && !targetm.target_option.function_versions (function, fndecl) | |
688 && (!is_template | |
689 || comp_template_parms (template_parms, | |
690 DECL_TEMPLATE_PARMS (fndecl))) | |
691 && equivalent_constraints (c1, c2) | |
692 && (DECL_TEMPLATE_SPECIALIZATION (function) | |
693 == DECL_TEMPLATE_SPECIALIZATION (fndecl)) | |
694 && (!DECL_TEMPLATE_SPECIALIZATION (function) | |
695 || (DECL_TI_TEMPLATE (function) == DECL_TI_TEMPLATE (fndecl)))) | |
696 matched = fndecl; | |
697 } | |
698 | |
699 if (!matched) | |
700 { | |
701 if (!COMPLETE_TYPE_P (ctype)) | |
702 cxx_incomplete_type_error (function, ctype); | |
703 else | |
704 { | |
705 if (DECL_CONV_FN_P (function)) | |
706 fns = get_class_binding (ctype, conv_op_identifier); | |
707 | |
708 error_at (DECL_SOURCE_LOCATION (function), | |
709 "no declaration matches %q#D", function); | |
710 if (fns) | |
711 print_candidates (fns); | |
712 else if (DECL_CONV_FN_P (function)) | |
713 inform (DECL_SOURCE_LOCATION (function), | |
714 "no conversion operators declared"); | |
715 else | |
716 inform (DECL_SOURCE_LOCATION (function), | |
717 "no functions named %qD", function); | |
718 inform (DECL_SOURCE_LOCATION (TYPE_NAME (ctype)), | |
719 "%#qT defined here", ctype); | |
720 } | |
721 matched = error_mark_node; | |
722 } | |
723 | |
724 if (pushed_scope) | |
725 pop_scope (pushed_scope); | |
726 | |
727 return matched; | |
728 } | |
729 | |
730 /* DECL is a function with vague linkage. Remember it so that at the | |
731 end of the translation unit we can decide whether or not to emit | |
732 it. */ | |
733 | |
734 void | |
735 note_vague_linkage_fn (tree decl) | |
736 { | |
737 DECL_DEFER_OUTPUT (decl) = 1; | |
738 vec_safe_push (deferred_fns, decl); | |
739 } | |
740 | |
741 /* As above, but for variable template instantiations. */ | |
742 | |
743 void | |
744 note_variable_template_instantiation (tree decl) | |
745 { | |
746 vec_safe_push (pending_statics, decl); | |
747 } | |
748 | |
749 /* We have just processed the DECL, which is a static data member. | |
750 The other parameters are as for cp_finish_decl. */ | |
751 | |
752 void | |
753 finish_static_data_member_decl (tree decl, | |
754 tree init, bool init_const_expr_p, | |
755 tree asmspec_tree, | |
756 int flags) | |
757 { | |
758 DECL_CONTEXT (decl) = current_class_type; | |
759 | |
760 /* We cannot call pushdecl here, because that would fill in the | |
761 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do | |
762 the right thing, namely, to put this decl out straight away. */ | |
763 | |
764 if (! processing_template_decl) | |
765 vec_safe_push (pending_statics, decl); | |
766 | |
767 if (LOCAL_CLASS_P (current_class_type) | |
768 /* We already complained about the template definition. */ | |
769 && !DECL_TEMPLATE_INSTANTIATION (decl)) | |
770 permerror (input_location, "local class %q#T shall not have static data member %q#D", | |
771 current_class_type, decl); | |
772 else | |
773 for (tree t = current_class_type; TYPE_P (t); | |
774 t = CP_TYPE_CONTEXT (t)) | |
775 if (TYPE_UNNAMED_P (t)) | |
776 { | |
777 if (permerror (DECL_SOURCE_LOCATION (decl), | |
778 "static data member %qD in unnamed class", decl)) | |
779 inform (DECL_SOURCE_LOCATION (TYPE_NAME (t)), | |
780 "unnamed class defined here"); | |
781 break; | |
782 } | |
783 | |
784 DECL_IN_AGGR_P (decl) = 1; | |
785 | |
786 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE | |
787 && TYPE_DOMAIN (TREE_TYPE (decl)) == NULL_TREE) | |
788 SET_VAR_HAD_UNKNOWN_BOUND (decl); | |
789 | |
790 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags); | |
791 } | |
792 | |
793 /* DECLARATOR and DECLSPECS correspond to a class member. The other | |
794 parameters are as for cp_finish_decl. Return the DECL for the | |
795 class member declared. */ | |
796 | |
797 tree | |
798 grokfield (const cp_declarator *declarator, | |
799 cp_decl_specifier_seq *declspecs, | |
800 tree init, bool init_const_expr_p, | |
801 tree asmspec_tree, | |
802 tree attrlist) | |
803 { | |
804 tree value; | |
805 const char *asmspec = 0; | |
806 int flags; | |
807 tree name; | |
808 | |
809 if (init | |
810 && TREE_CODE (init) == TREE_LIST | |
811 && TREE_VALUE (init) == error_mark_node | |
812 && TREE_CHAIN (init) == NULL_TREE) | |
813 init = NULL_TREE; | |
814 | |
815 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist); | |
816 if (! value || value == error_mark_node) | |
817 /* friend or constructor went bad. */ | |
818 return error_mark_node; | |
819 if (TREE_TYPE (value) == error_mark_node) | |
820 return value; | |
821 | |
822 if (TREE_CODE (value) == TYPE_DECL && init) | |
823 { | |
824 error ("typedef %qD is initialized (use decltype instead)", value); | |
825 init = NULL_TREE; | |
826 } | |
827 | |
828 /* Pass friendly classes back. */ | |
829 if (value == void_type_node) | |
830 return value; | |
831 | |
832 | |
833 name = DECL_NAME (value); | |
834 | |
835 if (name != NULL_TREE) | |
836 { | |
837 if (TREE_CODE (name) == TEMPLATE_ID_EXPR) | |
838 { | |
839 error ("explicit template argument list not allowed"); | |
840 return error_mark_node; | |
841 } | |
842 | |
843 if (IDENTIFIER_POINTER (name)[0] == '_' | |
844 && id_equal (name, "_vptr")) | |
845 error ("member %qD conflicts with virtual function table field name", | |
846 value); | |
847 } | |
848 | |
849 /* Stash away type declarations. */ | |
850 if (TREE_CODE (value) == TYPE_DECL) | |
851 { | |
852 DECL_NONLOCAL (value) = 1; | |
853 DECL_CONTEXT (value) = current_class_type; | |
854 | |
855 if (attrlist) | |
856 { | |
857 int attrflags = 0; | |
858 | |
859 /* If this is a typedef that names the class for linkage purposes | |
860 (7.1.3p8), apply any attributes directly to the type. */ | |
861 if (OVERLOAD_TYPE_P (TREE_TYPE (value)) | |
862 && value == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value)))) | |
863 attrflags = ATTR_FLAG_TYPE_IN_PLACE; | |
864 | |
865 cplus_decl_attributes (&value, attrlist, attrflags); | |
866 } | |
867 | |
868 if (decl_spec_seq_has_spec_p (declspecs, ds_typedef) | |
869 && TREE_TYPE (value) != error_mark_node | |
870 && TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))) != value) | |
871 set_underlying_type (value); | |
872 | |
873 /* It's important that push_template_decl below follows | |
874 set_underlying_type above so that the created template | |
875 carries the properly set type of VALUE. */ | |
876 if (processing_template_decl) | |
877 value = push_template_decl (value); | |
878 | |
879 record_locally_defined_typedef (value); | |
880 return value; | |
881 } | |
882 | |
883 int friendp = decl_spec_seq_has_spec_p (declspecs, ds_friend); | |
884 | |
885 if (!friendp && DECL_IN_AGGR_P (value)) | |
886 { | |
887 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value)); | |
888 return void_type_node; | |
889 } | |
890 | |
891 if (asmspec_tree && asmspec_tree != error_mark_node) | |
892 asmspec = TREE_STRING_POINTER (asmspec_tree); | |
893 | |
894 if (init) | |
895 { | |
896 if (TREE_CODE (value) == FUNCTION_DECL) | |
897 { | |
898 if (init == ridpointers[(int)RID_DELETE]) | |
899 { | |
900 DECL_DELETED_FN (value) = 1; | |
901 DECL_DECLARED_INLINE_P (value) = 1; | |
902 DECL_INITIAL (value) = error_mark_node; | |
903 } | |
904 else if (init == ridpointers[(int)RID_DEFAULT]) | |
905 { | |
906 if (defaultable_fn_check (value)) | |
907 { | |
908 DECL_DEFAULTED_FN (value) = 1; | |
909 DECL_INITIALIZED_IN_CLASS_P (value) = 1; | |
910 DECL_DECLARED_INLINE_P (value) = 1; | |
911 } | |
912 } | |
913 else if (TREE_CODE (init) == DEFAULT_ARG) | |
914 error ("invalid initializer for member function %qD", value); | |
915 else if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE) | |
916 { | |
917 if (integer_zerop (init)) | |
918 DECL_PURE_VIRTUAL_P (value) = 1; | |
919 else if (error_operand_p (init)) | |
920 ; /* An error has already been reported. */ | |
921 else | |
922 error ("invalid initializer for member function %qD", | |
923 value); | |
924 } | |
925 else | |
926 { | |
927 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE); | |
928 if (friendp) | |
929 error ("initializer specified for friend function %qD", | |
930 value); | |
931 else | |
932 error ("initializer specified for static member function %qD", | |
933 value); | |
934 } | |
935 } | |
936 else if (TREE_CODE (value) == FIELD_DECL) | |
937 /* C++11 NSDMI, keep going. */; | |
938 else if (!VAR_P (value)) | |
939 gcc_unreachable (); | |
940 } | |
941 | |
942 /* Pass friend decls back. */ | |
943 if ((TREE_CODE (value) == FUNCTION_DECL | |
944 || TREE_CODE (value) == TEMPLATE_DECL) | |
945 && DECL_CONTEXT (value) != current_class_type) | |
946 return value; | |
947 | |
948 /* Need to set this before push_template_decl. */ | |
949 if (VAR_P (value)) | |
950 DECL_CONTEXT (value) = current_class_type; | |
951 | |
952 if (processing_template_decl && VAR_OR_FUNCTION_DECL_P (value)) | |
953 { | |
954 value = push_template_decl (value); | |
955 if (error_operand_p (value)) | |
956 return error_mark_node; | |
957 } | |
958 | |
959 if (attrlist) | |
960 cplus_decl_attributes (&value, attrlist, 0); | |
961 | |
962 if (init && DIRECT_LIST_INIT_P (init)) | |
963 flags = LOOKUP_NORMAL; | |
964 else | |
965 flags = LOOKUP_IMPLICIT; | |
966 | |
967 switch (TREE_CODE (value)) | |
968 { | |
969 case VAR_DECL: | |
970 finish_static_data_member_decl (value, init, init_const_expr_p, | |
971 asmspec_tree, flags); | |
972 return value; | |
973 | |
974 case FIELD_DECL: | |
975 if (asmspec) | |
976 error ("%<asm%> specifiers are not permitted on non-static data members"); | |
977 if (DECL_INITIAL (value) == error_mark_node) | |
978 init = error_mark_node; | |
979 cp_finish_decl (value, init, /*init_const_expr_p=*/false, | |
980 NULL_TREE, flags); | |
981 DECL_IN_AGGR_P (value) = 1; | |
982 return value; | |
983 | |
984 case FUNCTION_DECL: | |
985 if (asmspec) | |
986 set_user_assembler_name (value, asmspec); | |
987 | |
988 cp_finish_decl (value, | |
989 /*init=*/NULL_TREE, | |
990 /*init_const_expr_p=*/false, | |
991 asmspec_tree, flags); | |
992 | |
993 /* Pass friends back this way. */ | |
994 if (DECL_FRIEND_P (value)) | |
995 return void_type_node; | |
996 | |
997 DECL_IN_AGGR_P (value) = 1; | |
998 return value; | |
999 | |
1000 default: | |
1001 gcc_unreachable (); | |
1002 } | |
1003 return NULL_TREE; | |
1004 } | |
1005 | |
1006 /* Like `grokfield', but for bitfields. | |
1007 WIDTH is the width of the bitfield, a constant expression. | |
1008 The other parameters are as for grokfield. */ | |
1009 | |
1010 tree | |
1011 grokbitfield (const cp_declarator *declarator, | |
1012 cp_decl_specifier_seq *declspecs, tree width, tree init, | |
1013 tree attrlist) | |
1014 { | |
1015 tree value = grokdeclarator (declarator, declspecs, BITFIELD, | |
1016 init != NULL_TREE, &attrlist); | |
1017 | |
1018 if (value == error_mark_node) | |
1019 return NULL_TREE; /* friends went bad. */ | |
1020 if (TREE_TYPE (value) == error_mark_node) | |
1021 return value; | |
1022 | |
1023 /* Pass friendly classes back. */ | |
1024 if (VOID_TYPE_P (value)) | |
1025 return void_type_node; | |
1026 | |
1027 if (!INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)) | |
1028 && (POINTER_TYPE_P (value) | |
1029 || !dependent_type_p (TREE_TYPE (value)))) | |
1030 { | |
1031 error ("bit-field %qD with non-integral type", value); | |
1032 return error_mark_node; | |
1033 } | |
1034 | |
1035 if (TREE_CODE (value) == TYPE_DECL) | |
1036 { | |
1037 error ("cannot declare %qD to be a bit-field type", value); | |
1038 return NULL_TREE; | |
1039 } | |
1040 | |
1041 /* Usually, finish_struct_1 catches bitfields with invalid types. | |
1042 But, in the case of bitfields with function type, we confuse | |
1043 ourselves into thinking they are member functions, so we must | |
1044 check here. */ | |
1045 if (TREE_CODE (value) == FUNCTION_DECL) | |
1046 { | |
1047 error ("cannot declare bit-field %qD with function type", | |
1048 DECL_NAME (value)); | |
1049 return NULL_TREE; | |
1050 } | |
1051 | |
1052 if (width && TYPE_WARN_IF_NOT_ALIGN (TREE_TYPE (value))) | |
1053 { | |
1054 error ("cannot declare bit-field %qD with %<warn_if_not_aligned%> type", | |
1055 DECL_NAME (value)); | |
1056 return NULL_TREE; | |
1057 } | |
1058 | |
1059 if (DECL_IN_AGGR_P (value)) | |
1060 { | |
1061 error ("%qD is already defined in the class %qT", value, | |
1062 DECL_CONTEXT (value)); | |
1063 return void_type_node; | |
1064 } | |
1065 | |
1066 if (TREE_STATIC (value)) | |
1067 { | |
1068 error ("static member %qD cannot be a bit-field", value); | |
1069 return NULL_TREE; | |
1070 } | |
1071 | |
1072 int flags = LOOKUP_IMPLICIT; | |
1073 if (init && DIRECT_LIST_INIT_P (init)) | |
1074 flags = LOOKUP_NORMAL; | |
1075 cp_finish_decl (value, init, false, NULL_TREE, flags); | |
1076 | |
1077 if (width != error_mark_node) | |
1078 { | |
1079 /* The width must be an integer type. */ | |
1080 if (!type_dependent_expression_p (width) | |
1081 && !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (width))) | |
1082 error ("width of bit-field %qD has non-integral type %qT", value, | |
1083 TREE_TYPE (width)); | |
1084 else | |
1085 { | |
1086 /* Temporarily stash the width in DECL_BIT_FIELD_REPRESENTATIVE. | |
1087 check_bitfield_decl picks it from there later and sets DECL_SIZE | |
1088 accordingly. */ | |
1089 DECL_BIT_FIELD_REPRESENTATIVE (value) = width; | |
1090 SET_DECL_C_BIT_FIELD (value); | |
1091 } | |
1092 } | |
1093 | |
1094 DECL_IN_AGGR_P (value) = 1; | |
1095 | |
1096 if (attrlist) | |
1097 cplus_decl_attributes (&value, attrlist, /*flags=*/0); | |
1098 | |
1099 return value; | |
1100 } | |
1101 | |
1102 | |
1103 /* Returns true iff ATTR is an attribute which needs to be applied at | |
1104 instantiation time rather than template definition time. */ | |
1105 | |
1106 static bool | |
1107 is_late_template_attribute (tree attr, tree decl) | |
1108 { | |
1109 tree name = get_attribute_name (attr); | |
1110 tree args = TREE_VALUE (attr); | |
1111 const struct attribute_spec *spec = lookup_attribute_spec (name); | |
1112 tree arg; | |
1113 | |
1114 if (!spec) | |
1115 /* Unknown attribute. */ | |
1116 return false; | |
1117 | |
1118 /* Attribute weak handling wants to write out assembly right away. */ | |
1119 if (is_attribute_p ("weak", name)) | |
1120 return true; | |
1121 | |
1122 /* Attributes used and unused are applied directly, as they appertain to | |
1123 decls. */ | |
1124 if (is_attribute_p ("unused", name) | |
1125 || is_attribute_p ("used", name)) | |
1126 return false; | |
1127 | |
1128 /* Attribute tls_model wants to modify the symtab. */ | |
1129 if (is_attribute_p ("tls_model", name)) | |
1130 return true; | |
1131 | |
1132 /* #pragma omp declare simd attribute needs to be always deferred. */ | |
1133 if (flag_openmp | |
1134 && is_attribute_p ("omp declare simd", name)) | |
1135 return true; | |
1136 | |
1137 /* An attribute pack is clearly dependent. */ | |
1138 if (args && PACK_EXPANSION_P (args)) | |
1139 return true; | |
1140 | |
1141 /* If any of the arguments are dependent expressions, we can't evaluate | |
1142 the attribute until instantiation time. */ | |
1143 for (arg = args; arg; arg = TREE_CHAIN (arg)) | |
1144 { | |
1145 tree t = TREE_VALUE (arg); | |
1146 | |
1147 /* If the first attribute argument is an identifier, only consider | |
1148 second and following arguments. Attributes like mode, format, | |
1149 cleanup and several target specific attributes aren't late | |
1150 just because they have an IDENTIFIER_NODE as first argument. */ | |
1151 if (arg == args && attribute_takes_identifier_p (name) | |
1152 && identifier_p (t)) | |
1153 continue; | |
1154 | |
1155 if (value_dependent_expression_p (t) | |
1156 || type_dependent_expression_p (t)) | |
1157 return true; | |
1158 } | |
1159 | |
1160 if (TREE_CODE (decl) == TYPE_DECL | |
1161 || TYPE_P (decl) | |
1162 || spec->type_required) | |
1163 { | |
1164 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl); | |
1165 | |
1166 /* We can't apply any attributes to a completely unknown type until | |
1167 instantiation time. */ | |
1168 enum tree_code code = TREE_CODE (type); | |
1169 if (code == TEMPLATE_TYPE_PARM | |
1170 || code == BOUND_TEMPLATE_TEMPLATE_PARM | |
1171 || code == TYPENAME_TYPE) | |
1172 return true; | |
1173 /* Also defer most attributes on dependent types. This is not | |
1174 necessary in all cases, but is the better default. */ | |
1175 else if (dependent_type_p (type) | |
1176 /* But some attributes specifically apply to templates. */ | |
1177 && !is_attribute_p ("abi_tag", name) | |
1178 && !is_attribute_p ("deprecated", name) | |
1179 && !is_attribute_p ("visibility", name)) | |
1180 return true; | |
1181 else | |
1182 return false; | |
1183 } | |
1184 else | |
1185 return false; | |
1186 } | |
1187 | |
1188 /* ATTR_P is a list of attributes. Remove any attributes which need to be | |
1189 applied at instantiation time and return them. If IS_DEPENDENT is true, | |
1190 the declaration itself is dependent, so all attributes should be applied | |
1191 at instantiation time. */ | |
1192 | |
1193 static tree | |
1194 splice_template_attributes (tree *attr_p, tree decl) | |
1195 { | |
1196 tree *p = attr_p; | |
1197 tree late_attrs = NULL_TREE; | |
1198 tree *q = &late_attrs; | |
1199 | |
1200 if (!p) | |
1201 return NULL_TREE; | |
1202 | |
1203 for (; *p; ) | |
1204 { | |
1205 if (is_late_template_attribute (*p, decl)) | |
1206 { | |
1207 ATTR_IS_DEPENDENT (*p) = 1; | |
1208 *q = *p; | |
1209 *p = TREE_CHAIN (*p); | |
1210 q = &TREE_CHAIN (*q); | |
1211 *q = NULL_TREE; | |
1212 } | |
1213 else | |
1214 p = &TREE_CHAIN (*p); | |
1215 } | |
1216 | |
1217 return late_attrs; | |
1218 } | |
1219 | |
1220 /* Remove any late attributes from the list in ATTR_P and attach them to | |
1221 DECL_P. */ | |
1222 | |
1223 static void | |
1224 save_template_attributes (tree *attr_p, tree *decl_p) | |
1225 { | |
1226 tree *q; | |
1227 | |
1228 if (attr_p && *attr_p == error_mark_node) | |
1229 return; | |
1230 | |
1231 tree late_attrs = splice_template_attributes (attr_p, *decl_p); | |
1232 if (!late_attrs) | |
1233 return; | |
1234 | |
1235 if (DECL_P (*decl_p)) | |
1236 q = &DECL_ATTRIBUTES (*decl_p); | |
1237 else | |
1238 q = &TYPE_ATTRIBUTES (*decl_p); | |
1239 | |
1240 tree old_attrs = *q; | |
1241 | |
1242 /* Merge the late attributes at the beginning with the attribute | |
1243 list. */ | |
1244 late_attrs = merge_attributes (late_attrs, *q); | |
1245 *q = late_attrs; | |
1246 | |
1247 if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p)) | |
1248 { | |
1249 /* We've added new attributes directly to the main variant, so | |
1250 now we need to update all of the other variants to include | |
1251 these new attributes. */ | |
1252 tree variant; | |
1253 for (variant = TYPE_NEXT_VARIANT (*decl_p); variant; | |
1254 variant = TYPE_NEXT_VARIANT (variant)) | |
1255 { | |
1256 gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs); | |
1257 TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p); | |
1258 } | |
1259 } | |
1260 } | |
1261 | |
1262 /* True if ATTRS contains any dependent attributes that affect type | |
1263 identity. */ | |
1264 | |
1265 bool | |
1266 any_dependent_type_attributes_p (tree attrs) | |
1267 { | |
1268 for (tree a = attrs; a; a = TREE_CHAIN (a)) | |
1269 if (ATTR_IS_DEPENDENT (a)) | |
1270 { | |
1271 const attribute_spec *as = lookup_attribute_spec (TREE_PURPOSE (a)); | |
1272 if (as && as->affects_type_identity) | |
1273 return true; | |
1274 } | |
1275 return false; | |
1276 } | |
1277 | |
1278 /* Return true iff ATTRS are acceptable attributes to be applied in-place | |
1279 to a typedef which gives a previously unnamed class or enum a name for | |
1280 linkage purposes. */ | |
1281 | |
1282 bool | |
1283 attributes_naming_typedef_ok (tree attrs) | |
1284 { | |
1285 for (; attrs; attrs = TREE_CHAIN (attrs)) | |
1286 { | |
1287 tree name = get_attribute_name (attrs); | |
1288 if (is_attribute_p ("vector_size", name)) | |
1289 return false; | |
1290 } | |
1291 return true; | |
1292 } | |
1293 | |
1294 /* Like reconstruct_complex_type, but handle also template trees. */ | |
1295 | |
1296 tree | |
1297 cp_reconstruct_complex_type (tree type, tree bottom) | |
1298 { | |
1299 tree inner, outer; | |
1300 bool late_return_type_p = false; | |
1301 | |
1302 if (TYPE_PTR_P (type)) | |
1303 { | |
1304 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom); | |
1305 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type), | |
1306 TYPE_REF_CAN_ALIAS_ALL (type)); | |
1307 } | |
1308 else if (TREE_CODE (type) == REFERENCE_TYPE) | |
1309 { | |
1310 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom); | |
1311 outer = build_reference_type_for_mode (inner, TYPE_MODE (type), | |
1312 TYPE_REF_CAN_ALIAS_ALL (type)); | |
1313 } | |
1314 else if (TREE_CODE (type) == ARRAY_TYPE) | |
1315 { | |
1316 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom); | |
1317 outer = build_cplus_array_type (inner, TYPE_DOMAIN (type)); | |
1318 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the | |
1319 element type qualification will be handled by the recursive | |
1320 cp_reconstruct_complex_type call and cp_build_qualified_type | |
1321 for ARRAY_TYPEs changes the element type. */ | |
1322 return outer; | |
1323 } | |
1324 else if (TREE_CODE (type) == FUNCTION_TYPE) | |
1325 { | |
1326 late_return_type_p = TYPE_HAS_LATE_RETURN_TYPE (type); | |
1327 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom); | |
1328 outer = build_function_type (inner, TYPE_ARG_TYPES (type)); | |
1329 outer = apply_memfn_quals (outer, | |
1330 type_memfn_quals (type), | |
1331 type_memfn_rqual (type)); | |
1332 } | |
1333 else if (TREE_CODE (type) == METHOD_TYPE) | |
1334 { | |
1335 late_return_type_p = TYPE_HAS_LATE_RETURN_TYPE (type); | |
1336 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom); | |
1337 /* The build_method_type_directly() routine prepends 'this' to argument list, | |
1338 so we must compensate by getting rid of it. */ | |
1339 outer | |
1340 = build_method_type_directly | |
1341 (class_of_this_parm (type), inner, | |
1342 TREE_CHAIN (TYPE_ARG_TYPES (type))); | |
1343 } | |
1344 else if (TREE_CODE (type) == OFFSET_TYPE) | |
1345 { | |
1346 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom); | |
1347 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner); | |
1348 } | |
1349 else | |
1350 return bottom; | |
1351 | |
1352 if (TYPE_ATTRIBUTES (type)) | |
1353 outer = cp_build_type_attribute_variant (outer, TYPE_ATTRIBUTES (type)); | |
1354 outer = cp_build_qualified_type (outer, cp_type_quals (type)); | |
1355 | |
1356 if (late_return_type_p) | |
1357 TYPE_HAS_LATE_RETURN_TYPE (outer) = 1; | |
1358 | |
1359 return outer; | |
1360 } | |
1361 | |
1362 /* Replaces any constexpr expression that may be into the attributes | |
1363 arguments with their reduced value. */ | |
1364 | |
1365 static void | |
1366 cp_check_const_attributes (tree attributes) | |
1367 { | |
1368 if (attributes == error_mark_node) | |
1369 return; | |
1370 | |
1371 tree attr; | |
1372 for (attr = attributes; attr; attr = TREE_CHAIN (attr)) | |
1373 { | |
1374 tree arg; | |
1375 for (arg = TREE_VALUE (attr); arg; arg = TREE_CHAIN (arg)) | |
1376 { | |
1377 tree expr = TREE_VALUE (arg); | |
1378 if (EXPR_P (expr)) | |
1379 TREE_VALUE (arg) = maybe_constant_value (expr); | |
1380 } | |
1381 } | |
1382 } | |
1383 | |
1384 /* Return true if TYPE is an OpenMP mappable type. */ | |
1385 bool | |
1386 cp_omp_mappable_type (tree type) | |
1387 { | |
1388 /* Mappable type has to be complete. */ | |
1389 if (type == error_mark_node || !COMPLETE_TYPE_P (type)) | |
1390 return false; | |
1391 /* Arrays have mappable type if the elements have mappable type. */ | |
1392 while (TREE_CODE (type) == ARRAY_TYPE) | |
1393 type = TREE_TYPE (type); | |
1394 /* A mappable type cannot contain virtual members. */ | |
1395 if (CLASS_TYPE_P (type) && CLASSTYPE_VTABLES (type)) | |
1396 return false; | |
1397 /* All data members must be non-static. */ | |
1398 if (CLASS_TYPE_P (type)) | |
1399 { | |
1400 tree field; | |
1401 for (field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field)) | |
1402 if (VAR_P (field)) | |
1403 return false; | |
1404 /* All fields must have mappable types. */ | |
1405 else if (TREE_CODE (field) == FIELD_DECL | |
1406 && !cp_omp_mappable_type (TREE_TYPE (field))) | |
1407 return false; | |
1408 } | |
1409 return true; | |
1410 } | |
1411 | |
1412 /* Like decl_attributes, but handle C++ complexity. */ | |
1413 | |
1414 void | |
1415 cplus_decl_attributes (tree *decl, tree attributes, int flags) | |
1416 { | |
1417 if (*decl == NULL_TREE || *decl == void_type_node | |
1418 || *decl == error_mark_node) | |
1419 return; | |
1420 | |
1421 /* Add implicit "omp declare target" attribute if requested. */ | |
1422 if (scope_chain->omp_declare_target_attribute | |
1423 && ((VAR_P (*decl) | |
1424 && (TREE_STATIC (*decl) || DECL_EXTERNAL (*decl))) | |
1425 || TREE_CODE (*decl) == FUNCTION_DECL)) | |
1426 { | |
1427 if (VAR_P (*decl) | |
1428 && DECL_CLASS_SCOPE_P (*decl)) | |
1429 error ("%q+D static data member inside of declare target directive", | |
1430 *decl); | |
1431 else if (!processing_template_decl | |
1432 && VAR_P (*decl) | |
1433 && !cp_omp_mappable_type (TREE_TYPE (*decl))) | |
1434 error ("%q+D in declare target directive does not have mappable type", | |
1435 *decl); | |
1436 else | |
1437 attributes = tree_cons (get_identifier ("omp declare target"), | |
1438 NULL_TREE, attributes); | |
1439 } | |
1440 | |
1441 if (processing_template_decl) | |
1442 { | |
1443 if (check_for_bare_parameter_packs (attributes)) | |
1444 return; | |
1445 | |
1446 save_template_attributes (&attributes, decl); | |
1447 } | |
1448 | |
1449 cp_check_const_attributes (attributes); | |
1450 | |
1451 if (TREE_CODE (*decl) == TEMPLATE_DECL) | |
1452 decl = &DECL_TEMPLATE_RESULT (*decl); | |
1453 | |
1454 if (TREE_TYPE (*decl) && TYPE_PTRMEMFUNC_P (TREE_TYPE (*decl))) | |
1455 { | |
1456 attributes | |
1457 = decl_attributes (decl, attributes, flags | ATTR_FLAG_FUNCTION_NEXT); | |
1458 decl_attributes (&TYPE_PTRMEMFUNC_FN_TYPE_RAW (TREE_TYPE (*decl)), | |
1459 attributes, flags); | |
1460 } | |
1461 else | |
1462 decl_attributes (decl, attributes, flags); | |
1463 | |
1464 if (TREE_CODE (*decl) == TYPE_DECL) | |
1465 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl)); | |
1466 | |
1467 /* Propagate deprecation out to the template. */ | |
1468 if (TREE_DEPRECATED (*decl)) | |
1469 if (tree ti = get_template_info (*decl)) | |
1470 { | |
1471 tree tmpl = TI_TEMPLATE (ti); | |
1472 tree pattern = (TYPE_P (*decl) ? TREE_TYPE (tmpl) | |
1473 : DECL_TEMPLATE_RESULT (tmpl)); | |
1474 if (*decl == pattern) | |
1475 TREE_DEPRECATED (tmpl) = true; | |
1476 } | |
1477 } | |
1478 | |
1479 /* Walks through the namespace- or function-scope anonymous union | |
1480 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs. | |
1481 Returns one of the fields for use in the mangled name. */ | |
1482 | |
1483 static tree | |
1484 build_anon_union_vars (tree type, tree object) | |
1485 { | |
1486 tree main_decl = NULL_TREE; | |
1487 tree field; | |
1488 | |
1489 /* Rather than write the code to handle the non-union case, | |
1490 just give an error. */ | |
1491 if (TREE_CODE (type) != UNION_TYPE) | |
1492 { | |
1493 error ("anonymous struct not inside named type"); | |
1494 return error_mark_node; | |
1495 } | |
1496 | |
1497 for (field = TYPE_FIELDS (type); | |
1498 field != NULL_TREE; | |
1499 field = DECL_CHAIN (field)) | |
1500 { | |
1501 tree decl; | |
1502 tree ref; | |
1503 | |
1504 if (DECL_ARTIFICIAL (field)) | |
1505 continue; | |
1506 if (TREE_CODE (field) != FIELD_DECL) | |
1507 { | |
1508 permerror (DECL_SOURCE_LOCATION (field), | |
1509 "%q#D invalid; an anonymous union can only " | |
1510 "have non-static data members", field); | |
1511 continue; | |
1512 } | |
1513 | |
1514 if (TREE_PRIVATE (field)) | |
1515 permerror (DECL_SOURCE_LOCATION (field), | |
1516 "private member %q#D in anonymous union", field); | |
1517 else if (TREE_PROTECTED (field)) | |
1518 permerror (DECL_SOURCE_LOCATION (field), | |
1519 "protected member %q#D in anonymous union", field); | |
1520 | |
1521 if (processing_template_decl) | |
1522 ref = build_min_nt_loc (UNKNOWN_LOCATION, COMPONENT_REF, object, | |
1523 DECL_NAME (field), NULL_TREE); | |
1524 else | |
1525 ref = build_class_member_access_expr (object, field, NULL_TREE, | |
1526 false, tf_warning_or_error); | |
1527 | |
1528 if (DECL_NAME (field)) | |
1529 { | |
1530 tree base; | |
1531 | |
1532 decl = build_decl (input_location, | |
1533 VAR_DECL, DECL_NAME (field), TREE_TYPE (field)); | |
1534 DECL_ANON_UNION_VAR_P (decl) = 1; | |
1535 DECL_ARTIFICIAL (decl) = 1; | |
1536 | |
1537 base = get_base_address (object); | |
1538 TREE_PUBLIC (decl) = TREE_PUBLIC (base); | |
1539 TREE_STATIC (decl) = TREE_STATIC (base); | |
1540 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base); | |
1541 | |
1542 SET_DECL_VALUE_EXPR (decl, ref); | |
1543 DECL_HAS_VALUE_EXPR_P (decl) = 1; | |
1544 | |
1545 decl = pushdecl (decl); | |
1546 } | |
1547 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field))) | |
1548 decl = build_anon_union_vars (TREE_TYPE (field), ref); | |
1549 else | |
1550 decl = 0; | |
1551 | |
1552 if (main_decl == NULL_TREE) | |
1553 main_decl = decl; | |
1554 } | |
1555 | |
1556 return main_decl; | |
1557 } | |
1558 | |
1559 /* Finish off the processing of a UNION_TYPE structure. If the union is an | |
1560 anonymous union, then all members must be laid out together. PUBLIC_P | |
1561 is nonzero if this union is not declared static. */ | |
1562 | |
1563 void | |
1564 finish_anon_union (tree anon_union_decl) | |
1565 { | |
1566 tree type; | |
1567 tree main_decl; | |
1568 bool public_p; | |
1569 | |
1570 if (anon_union_decl == error_mark_node) | |
1571 return; | |
1572 | |
1573 type = TREE_TYPE (anon_union_decl); | |
1574 public_p = TREE_PUBLIC (anon_union_decl); | |
1575 | |
1576 /* The VAR_DECL's context is the same as the TYPE's context. */ | |
1577 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type)); | |
1578 | |
1579 if (TYPE_FIELDS (type) == NULL_TREE) | |
1580 return; | |
1581 | |
1582 if (public_p) | |
1583 { | |
1584 error ("namespace-scope anonymous aggregates must be static"); | |
1585 return; | |
1586 } | |
1587 | |
1588 main_decl = build_anon_union_vars (type, anon_union_decl); | |
1589 if (main_decl == error_mark_node) | |
1590 return; | |
1591 if (main_decl == NULL_TREE) | |
1592 { | |
1593 pedwarn (input_location, 0, "anonymous union with no members"); | |
1594 return; | |
1595 } | |
1596 | |
1597 if (!processing_template_decl) | |
1598 { | |
1599 /* Use main_decl to set the mangled name. */ | |
1600 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl); | |
1601 maybe_commonize_var (anon_union_decl); | |
1602 if (TREE_STATIC (anon_union_decl) || DECL_EXTERNAL (anon_union_decl)) | |
1603 mangle_decl (anon_union_decl); | |
1604 DECL_NAME (anon_union_decl) = NULL_TREE; | |
1605 } | |
1606 | |
1607 pushdecl (anon_union_decl); | |
1608 cp_finish_decl (anon_union_decl, NULL_TREE, false, NULL_TREE, 0); | |
1609 } | |
1610 | |
1611 /* Auxiliary functions to make type signatures for | |
1612 `operator new' and `operator delete' correspond to | |
1613 what compiler will be expecting. */ | |
1614 | |
1615 tree | |
1616 coerce_new_type (tree type) | |
1617 { | |
1618 int e = 0; | |
1619 tree args = TYPE_ARG_TYPES (type); | |
1620 | |
1621 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE); | |
1622 | |
1623 if (!same_type_p (TREE_TYPE (type), ptr_type_node)) | |
1624 { | |
1625 e = 1; | |
1626 error ("%<operator new%> must return type %qT", ptr_type_node); | |
1627 } | |
1628 | |
1629 if (args && args != void_list_node) | |
1630 { | |
1631 if (TREE_PURPOSE (args)) | |
1632 { | |
1633 /* [basic.stc.dynamic.allocation] | |
1634 | |
1635 The first parameter shall not have an associated default | |
1636 argument. */ | |
1637 error ("the first parameter of %<operator new%> cannot " | |
1638 "have a default argument"); | |
1639 /* Throw away the default argument. */ | |
1640 TREE_PURPOSE (args) = NULL_TREE; | |
1641 } | |
1642 | |
1643 if (!same_type_p (TREE_VALUE (args), size_type_node)) | |
1644 { | |
1645 e = 2; | |
1646 args = TREE_CHAIN (args); | |
1647 } | |
1648 } | |
1649 else | |
1650 e = 2; | |
1651 | |
1652 if (e == 2) | |
1653 permerror (input_location, "%<operator new%> takes type %<size_t%> (%qT) " | |
1654 "as first parameter", size_type_node); | |
1655 | |
1656 switch (e) | |
1657 { | |
1658 case 2: | |
1659 args = tree_cons (NULL_TREE, size_type_node, args); | |
1660 /* Fall through. */ | |
1661 case 1: | |
1662 type = build_exception_variant | |
1663 (build_function_type (ptr_type_node, args), | |
1664 TYPE_RAISES_EXCEPTIONS (type)); | |
1665 /* Fall through. */ | |
1666 default:; | |
1667 } | |
1668 return type; | |
1669 } | |
1670 | |
1671 tree | |
1672 coerce_delete_type (tree type) | |
1673 { | |
1674 int e = 0; | |
1675 tree args = TYPE_ARG_TYPES (type); | |
1676 | |
1677 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE); | |
1678 | |
1679 if (!same_type_p (TREE_TYPE (type), void_type_node)) | |
1680 { | |
1681 e = 1; | |
1682 error ("%<operator delete%> must return type %qT", void_type_node); | |
1683 } | |
1684 | |
1685 if (!args || args == void_list_node | |
1686 || !same_type_p (TREE_VALUE (args), ptr_type_node)) | |
1687 { | |
1688 e = 2; | |
1689 if (args && args != void_list_node) | |
1690 args = TREE_CHAIN (args); | |
1691 error ("%<operator delete%> takes type %qT as first parameter", | |
1692 ptr_type_node); | |
1693 } | |
1694 switch (e) | |
1695 { | |
1696 case 2: | |
1697 args = tree_cons (NULL_TREE, ptr_type_node, args); | |
1698 /* Fall through. */ | |
1699 case 1: | |
1700 type = build_exception_variant | |
1701 (build_function_type (void_type_node, args), | |
1702 TYPE_RAISES_EXCEPTIONS (type)); | |
1703 /* Fall through. */ | |
1704 default:; | |
1705 } | |
1706 | |
1707 return type; | |
1708 } | |
1709 | |
1710 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable | |
1711 and mark them as needed. */ | |
1712 | |
1713 static void | |
1714 mark_vtable_entries (tree decl) | |
1715 { | |
1716 tree fnaddr; | |
1717 unsigned HOST_WIDE_INT idx; | |
1718 | |
1719 /* It's OK for the vtable to refer to deprecated virtual functions. */ | |
1720 warning_sentinel w(warn_deprecated_decl); | |
1721 | |
1722 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)), | |
1723 idx, fnaddr) | |
1724 { | |
1725 tree fn; | |
1726 | |
1727 STRIP_NOPS (fnaddr); | |
1728 | |
1729 if (TREE_CODE (fnaddr) != ADDR_EXPR | |
1730 && TREE_CODE (fnaddr) != FDESC_EXPR) | |
1731 /* This entry is an offset: a virtual base class offset, a | |
1732 virtual call offset, an RTTI offset, etc. */ | |
1733 continue; | |
1734 | |
1735 fn = TREE_OPERAND (fnaddr, 0); | |
1736 TREE_ADDRESSABLE (fn) = 1; | |
1737 /* When we don't have vcall offsets, we output thunks whenever | |
1738 we output the vtables that contain them. With vcall offsets, | |
1739 we know all the thunks we'll need when we emit a virtual | |
1740 function, so we emit the thunks there instead. */ | |
1741 if (DECL_THUNK_P (fn)) | |
1742 use_thunk (fn, /*emit_p=*/0); | |
1743 mark_used (fn); | |
1744 } | |
1745 } | |
1746 | |
1747 /* Set DECL up to have the closest approximation of "initialized common" | |
1748 linkage available. */ | |
1749 | |
1750 void | |
1751 comdat_linkage (tree decl) | |
1752 { | |
1753 if (flag_weak) | |
1754 make_decl_one_only (decl, cxx_comdat_group (decl)); | |
1755 else if (TREE_CODE (decl) == FUNCTION_DECL | |
1756 || (VAR_P (decl) && DECL_ARTIFICIAL (decl))) | |
1757 /* We can just emit function and compiler-generated variables | |
1758 statically; having multiple copies is (for the most part) only | |
1759 a waste of space. | |
1760 | |
1761 There are two correctness issues, however: the address of a | |
1762 template instantiation with external linkage should be the | |
1763 same, independent of what translation unit asks for the | |
1764 address, and this will not hold when we emit multiple copies of | |
1765 the function. However, there's little else we can do. | |
1766 | |
1767 Also, by default, the typeinfo implementation assumes that | |
1768 there will be only one copy of the string used as the name for | |
1769 each type. Therefore, if weak symbols are unavailable, the | |
1770 run-time library should perform a more conservative check; it | |
1771 should perform a string comparison, rather than an address | |
1772 comparison. */ | |
1773 TREE_PUBLIC (decl) = 0; | |
1774 else | |
1775 { | |
1776 /* Static data member template instantiations, however, cannot | |
1777 have multiple copies. */ | |
1778 if (DECL_INITIAL (decl) == 0 | |
1779 || DECL_INITIAL (decl) == error_mark_node) | |
1780 DECL_COMMON (decl) = 1; | |
1781 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))) | |
1782 { | |
1783 DECL_COMMON (decl) = 1; | |
1784 DECL_INITIAL (decl) = error_mark_node; | |
1785 } | |
1786 else if (!DECL_EXPLICIT_INSTANTIATION (decl)) | |
1787 { | |
1788 /* We can't do anything useful; leave vars for explicit | |
1789 instantiation. */ | |
1790 DECL_EXTERNAL (decl) = 1; | |
1791 DECL_NOT_REALLY_EXTERN (decl) = 0; | |
1792 } | |
1793 } | |
1794 | |
1795 if (TREE_PUBLIC (decl)) | |
1796 DECL_COMDAT (decl) = 1; | |
1797 } | |
1798 | |
1799 /* For win32 we also want to put explicit instantiations in | |
1800 linkonce sections, so that they will be merged with implicit | |
1801 instantiations; otherwise we get duplicate symbol errors. | |
1802 For Darwin we do not want explicit instantiations to be | |
1803 linkonce. */ | |
1804 | |
1805 void | |
1806 maybe_make_one_only (tree decl) | |
1807 { | |
1808 /* We used to say that this was not necessary on targets that support weak | |
1809 symbols, because the implicit instantiations will defer to the explicit | |
1810 one. However, that's not actually the case in SVR4; a strong definition | |
1811 after a weak one is an error. Also, not making explicit | |
1812 instantiations one_only means that we can end up with two copies of | |
1813 some template instantiations. */ | |
1814 if (! flag_weak) | |
1815 return; | |
1816 | |
1817 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think | |
1818 we can get away with not emitting them if they aren't used. We need | |
1819 to for variables so that cp_finish_decl will update their linkage, | |
1820 because their DECL_INITIAL may not have been set properly yet. */ | |
1821 | |
1822 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC | |
1823 || (! DECL_EXPLICIT_INSTANTIATION (decl) | |
1824 && ! DECL_TEMPLATE_SPECIALIZATION (decl))) | |
1825 { | |
1826 make_decl_one_only (decl, cxx_comdat_group (decl)); | |
1827 | |
1828 if (VAR_P (decl)) | |
1829 { | |
1830 varpool_node *node = varpool_node::get_create (decl); | |
1831 DECL_COMDAT (decl) = 1; | |
1832 /* Mark it needed so we don't forget to emit it. */ | |
1833 node->forced_by_abi = true; | |
1834 TREE_USED (decl) = 1; | |
1835 } | |
1836 } | |
1837 } | |
1838 | |
1839 /* Returns true iff DECL, a FUNCTION_DECL or VAR_DECL, has vague linkage. | |
1840 This predicate will give the right answer during parsing of the | |
1841 function, which other tests may not. */ | |
1842 | |
1843 bool | |
1844 vague_linkage_p (tree decl) | |
1845 { | |
1846 if (!TREE_PUBLIC (decl)) | |
1847 { | |
1848 /* maybe_thunk_body clears TREE_PUBLIC on the maybe-in-charge 'tor | |
1849 variants, check one of the "clones" for the real linkage. */ | |
1850 if ((DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl) | |
1851 || DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)) | |
1852 && DECL_CHAIN (decl) | |
1853 && DECL_CLONED_FUNCTION (DECL_CHAIN (decl))) | |
1854 return vague_linkage_p (DECL_CHAIN (decl)); | |
1855 | |
1856 gcc_checking_assert (!DECL_COMDAT (decl)); | |
1857 return false; | |
1858 } | |
1859 /* Unfortunately, import_export_decl has not always been called | |
1860 before the function is processed, so we cannot simply check | |
1861 DECL_COMDAT. */ | |
1862 if (DECL_COMDAT (decl) | |
1863 || (TREE_CODE (decl) == FUNCTION_DECL | |
1864 && DECL_DECLARED_INLINE_P (decl)) | |
1865 || (DECL_LANG_SPECIFIC (decl) | |
1866 && DECL_TEMPLATE_INSTANTIATION (decl)) | |
1867 || (VAR_P (decl) && DECL_INLINE_VAR_P (decl))) | |
1868 return true; | |
1869 else if (DECL_FUNCTION_SCOPE_P (decl)) | |
1870 /* A local static in an inline effectively has vague linkage. */ | |
1871 return (TREE_STATIC (decl) | |
1872 && vague_linkage_p (DECL_CONTEXT (decl))); | |
1873 else | |
1874 return false; | |
1875 } | |
1876 | |
1877 /* Determine whether or not we want to specifically import or export CTYPE, | |
1878 using various heuristics. */ | |
1879 | |
1880 static void | |
1881 import_export_class (tree ctype) | |
1882 { | |
1883 /* -1 for imported, 1 for exported. */ | |
1884 int import_export = 0; | |
1885 | |
1886 /* It only makes sense to call this function at EOF. The reason is | |
1887 that this function looks at whether or not the first non-inline | |
1888 non-abstract virtual member function has been defined in this | |
1889 translation unit. But, we can't possibly know that until we've | |
1890 seen the entire translation unit. */ | |
1891 gcc_assert (at_eof); | |
1892 | |
1893 if (CLASSTYPE_INTERFACE_KNOWN (ctype)) | |
1894 return; | |
1895 | |
1896 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface, | |
1897 we will have CLASSTYPE_INTERFACE_ONLY set but not | |
1898 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this | |
1899 heuristic because someone will supply a #pragma implementation | |
1900 elsewhere, and deducing it here would produce a conflict. */ | |
1901 if (CLASSTYPE_INTERFACE_ONLY (ctype)) | |
1902 return; | |
1903 | |
1904 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype))) | |
1905 import_export = -1; | |
1906 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype))) | |
1907 import_export = 1; | |
1908 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype) | |
1909 && !flag_implicit_templates) | |
1910 /* For a template class, without -fimplicit-templates, check the | |
1911 repository. If the virtual table is assigned to this | |
1912 translation unit, then export the class; otherwise, import | |
1913 it. */ | |
1914 import_export = repo_export_class_p (ctype) ? 1 : -1; | |
1915 else if (TYPE_POLYMORPHIC_P (ctype)) | |
1916 { | |
1917 /* The ABI specifies that the virtual table and associated | |
1918 information are emitted with the key method, if any. */ | |
1919 tree method = CLASSTYPE_KEY_METHOD (ctype); | |
1920 /* If weak symbol support is not available, then we must be | |
1921 careful not to emit the vtable when the key function is | |
1922 inline. An inline function can be defined in multiple | |
1923 translation units. If we were to emit the vtable in each | |
1924 translation unit containing a definition, we would get | |
1925 multiple definition errors at link-time. */ | |
1926 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method))) | |
1927 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1); | |
1928 } | |
1929 | |
1930 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing | |
1931 a definition anywhere else. */ | |
1932 if (MULTIPLE_SYMBOL_SPACES && import_export == -1) | |
1933 import_export = 0; | |
1934 | |
1935 /* Allow back ends the chance to overrule the decision. */ | |
1936 if (targetm.cxx.import_export_class) | |
1937 import_export = targetm.cxx.import_export_class (ctype, import_export); | |
1938 | |
1939 if (import_export) | |
1940 { | |
1941 SET_CLASSTYPE_INTERFACE_KNOWN (ctype); | |
1942 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0); | |
1943 } | |
1944 } | |
1945 | |
1946 /* Return true if VAR has already been provided to the back end; in that | |
1947 case VAR should not be modified further by the front end. */ | |
1948 static bool | |
1949 var_finalized_p (tree var) | |
1950 { | |
1951 return varpool_node::get_create (var)->definition; | |
1952 } | |
1953 | |
1954 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason, | |
1955 must be emitted in this translation unit. Mark it as such. */ | |
1956 | |
1957 void | |
1958 mark_needed (tree decl) | |
1959 { | |
1960 TREE_USED (decl) = 1; | |
1961 if (TREE_CODE (decl) == FUNCTION_DECL) | |
1962 { | |
1963 /* Extern inline functions don't become needed when referenced. | |
1964 If we know a method will be emitted in other TU and no new | |
1965 functions can be marked reachable, just use the external | |
1966 definition. */ | |
1967 struct cgraph_node *node = cgraph_node::get_create (decl); | |
1968 node->forced_by_abi = true; | |
1969 | |
1970 /* #pragma interface and -frepo code can call mark_needed for | |
1971 maybe-in-charge 'tors; mark the clones as well. */ | |
1972 tree clone; | |
1973 FOR_EACH_CLONE (clone, decl) | |
1974 mark_needed (clone); | |
1975 } | |
1976 else if (VAR_P (decl)) | |
1977 { | |
1978 varpool_node *node = varpool_node::get_create (decl); | |
1979 /* C++ frontend use mark_decl_references to force COMDAT variables | |
1980 to be output that might appear dead otherwise. */ | |
1981 node->forced_by_abi = true; | |
1982 } | |
1983 } | |
1984 | |
1985 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function | |
1986 returns true if a definition of this entity should be provided in | |
1987 this object file. Callers use this function to determine whether | |
1988 or not to let the back end know that a definition of DECL is | |
1989 available in this translation unit. */ | |
1990 | |
1991 bool | |
1992 decl_needed_p (tree decl) | |
1993 { | |
1994 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl)); | |
1995 /* This function should only be called at the end of the translation | |
1996 unit. We cannot be sure of whether or not something will be | |
1997 COMDAT until that point. */ | |
1998 gcc_assert (at_eof); | |
1999 | |
2000 /* All entities with external linkage that are not COMDAT/EXTERN should be | |
2001 emitted; they may be referred to from other object files. */ | |
2002 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl) && !DECL_REALLY_EXTERN (decl)) | |
2003 return true; | |
2004 /* Functions marked "dllexport" must be emitted so that they are | |
2005 visible to other DLLs. */ | |
2006 if (flag_keep_inline_dllexport | |
2007 && lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl))) | |
2008 return true; | |
2009 | |
2010 /* When not optimizing, do not bother to produce definitions for extern | |
2011 symbols. */ | |
2012 if (DECL_REALLY_EXTERN (decl) | |
2013 && ((TREE_CODE (decl) != FUNCTION_DECL | |
2014 && !optimize) | |
2015 || (TREE_CODE (decl) == FUNCTION_DECL | |
2016 && !opt_for_fn (decl, optimize))) | |
2017 && !lookup_attribute ("always_inline", decl)) | |
2018 return false; | |
2019 | |
2020 /* If this entity was used, let the back end see it; it will decide | |
2021 whether or not to emit it into the object file. */ | |
2022 if (TREE_USED (decl)) | |
2023 return true; | |
2024 | |
2025 /* Virtual functions might be needed for devirtualization. */ | |
2026 if (flag_devirtualize | |
2027 && TREE_CODE (decl) == FUNCTION_DECL | |
2028 && DECL_VIRTUAL_P (decl)) | |
2029 return true; | |
2030 | |
2031 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent | |
2032 reference to DECL might cause it to be emitted later. */ | |
2033 return false; | |
2034 } | |
2035 | |
2036 /* If necessary, write out the vtables for the dynamic class CTYPE. | |
2037 Returns true if any vtables were emitted. */ | |
2038 | |
2039 static bool | |
2040 maybe_emit_vtables (tree ctype) | |
2041 { | |
2042 tree vtbl; | |
2043 tree primary_vtbl; | |
2044 int needed = 0; | |
2045 varpool_node *current = NULL, *last = NULL; | |
2046 | |
2047 /* If the vtables for this class have already been emitted there is | |
2048 nothing more to do. */ | |
2049 primary_vtbl = CLASSTYPE_VTABLES (ctype); | |
2050 if (var_finalized_p (primary_vtbl)) | |
2051 return false; | |
2052 /* Ignore dummy vtables made by get_vtable_decl. */ | |
2053 if (TREE_TYPE (primary_vtbl) == void_type_node) | |
2054 return false; | |
2055 | |
2056 /* On some targets, we cannot determine the key method until the end | |
2057 of the translation unit -- which is when this function is | |
2058 called. */ | |
2059 if (!targetm.cxx.key_method_may_be_inline ()) | |
2060 determine_key_method (ctype); | |
2061 | |
2062 /* See if any of the vtables are needed. */ | |
2063 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = DECL_CHAIN (vtbl)) | |
2064 { | |
2065 import_export_decl (vtbl); | |
2066 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl)) | |
2067 needed = 1; | |
2068 } | |
2069 if (!needed) | |
2070 { | |
2071 /* If the references to this class' vtables are optimized away, | |
2072 still emit the appropriate debugging information. See | |
2073 dfs_debug_mark. */ | |
2074 if (DECL_COMDAT (primary_vtbl) | |
2075 && CLASSTYPE_DEBUG_REQUESTED (ctype)) | |
2076 note_debug_info_needed (ctype); | |
2077 return false; | |
2078 } | |
2079 | |
2080 /* The ABI requires that we emit all of the vtables if we emit any | |
2081 of them. */ | |
2082 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = DECL_CHAIN (vtbl)) | |
2083 { | |
2084 /* Mark entities references from the virtual table as used. */ | |
2085 mark_vtable_entries (vtbl); | |
2086 | |
2087 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0) | |
2088 { | |
2089 vec<tree, va_gc> *cleanups = NULL; | |
2090 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl), &cleanups, | |
2091 LOOKUP_NORMAL); | |
2092 | |
2093 /* It had better be all done at compile-time. */ | |
2094 gcc_assert (!expr && !cleanups); | |
2095 } | |
2096 | |
2097 /* Write it out. */ | |
2098 DECL_EXTERNAL (vtbl) = 0; | |
2099 rest_of_decl_compilation (vtbl, 1, 1); | |
2100 | |
2101 /* Because we're only doing syntax-checking, we'll never end up | |
2102 actually marking the variable as written. */ | |
2103 if (flag_syntax_only) | |
2104 TREE_ASM_WRITTEN (vtbl) = 1; | |
2105 else if (DECL_ONE_ONLY (vtbl)) | |
2106 { | |
2107 current = varpool_node::get_create (vtbl); | |
2108 if (last) | |
2109 current->add_to_same_comdat_group (last); | |
2110 last = current; | |
2111 } | |
2112 } | |
2113 | |
2114 /* Since we're writing out the vtable here, also write the debug | |
2115 info. */ | |
2116 note_debug_info_needed (ctype); | |
2117 | |
2118 return true; | |
2119 } | |
2120 | |
2121 /* A special return value from type_visibility meaning internal | |
2122 linkage. */ | |
2123 | |
2124 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 }; | |
2125 | |
2126 /* walk_tree helper function for type_visibility. */ | |
2127 | |
2128 static tree | |
2129 min_vis_r (tree *tp, int *walk_subtrees, void *data) | |
2130 { | |
2131 int *vis_p = (int *)data; | |
2132 if (! TYPE_P (*tp)) | |
2133 { | |
2134 *walk_subtrees = 0; | |
2135 } | |
2136 else if (OVERLOAD_TYPE_P (*tp) | |
2137 && !TREE_PUBLIC (TYPE_MAIN_DECL (*tp))) | |
2138 { | |
2139 *vis_p = VISIBILITY_ANON; | |
2140 return *tp; | |
2141 } | |
2142 else if (CLASS_TYPE_P (*tp) | |
2143 && CLASSTYPE_VISIBILITY (*tp) > *vis_p) | |
2144 *vis_p = CLASSTYPE_VISIBILITY (*tp); | |
2145 return NULL; | |
2146 } | |
2147 | |
2148 /* Returns the visibility of TYPE, which is the minimum visibility of its | |
2149 component types. */ | |
2150 | |
2151 static int | |
2152 type_visibility (tree type) | |
2153 { | |
2154 int vis = VISIBILITY_DEFAULT; | |
2155 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis); | |
2156 return vis; | |
2157 } | |
2158 | |
2159 /* Limit the visibility of DECL to VISIBILITY, if not explicitly | |
2160 specified (or if VISIBILITY is static). If TMPL is true, this | |
2161 constraint is for a template argument, and takes precedence | |
2162 over explicitly-specified visibility on the template. */ | |
2163 | |
2164 static void | |
2165 constrain_visibility (tree decl, int visibility, bool tmpl) | |
2166 { | |
2167 if (visibility == VISIBILITY_ANON) | |
2168 { | |
2169 /* extern "C" declarations aren't affected by the anonymous | |
2170 namespace. */ | |
2171 if (!DECL_EXTERN_C_P (decl)) | |
2172 { | |
2173 TREE_PUBLIC (decl) = 0; | |
2174 DECL_WEAK (decl) = 0; | |
2175 DECL_COMMON (decl) = 0; | |
2176 DECL_COMDAT (decl) = false; | |
2177 if (VAR_OR_FUNCTION_DECL_P (decl)) | |
2178 { | |
2179 struct symtab_node *snode = symtab_node::get (decl); | |
2180 | |
2181 if (snode) | |
2182 snode->set_comdat_group (NULL); | |
2183 } | |
2184 DECL_INTERFACE_KNOWN (decl) = 1; | |
2185 if (DECL_LANG_SPECIFIC (decl)) | |
2186 DECL_NOT_REALLY_EXTERN (decl) = 1; | |
2187 } | |
2188 } | |
2189 else if (visibility > DECL_VISIBILITY (decl) | |
2190 && (tmpl || !DECL_VISIBILITY_SPECIFIED (decl))) | |
2191 { | |
2192 DECL_VISIBILITY (decl) = (enum symbol_visibility) visibility; | |
2193 /* This visibility was not specified. */ | |
2194 DECL_VISIBILITY_SPECIFIED (decl) = false; | |
2195 } | |
2196 } | |
2197 | |
2198 /* Constrain the visibility of DECL based on the visibility of its template | |
2199 arguments. */ | |
2200 | |
2201 static void | |
2202 constrain_visibility_for_template (tree decl, tree targs) | |
2203 { | |
2204 /* If this is a template instantiation, check the innermost | |
2205 template args for visibility constraints. The outer template | |
2206 args are covered by the class check. */ | |
2207 tree args = INNERMOST_TEMPLATE_ARGS (targs); | |
2208 int i; | |
2209 for (i = TREE_VEC_LENGTH (args); i > 0; --i) | |
2210 { | |
2211 int vis = 0; | |
2212 | |
2213 tree arg = TREE_VEC_ELT (args, i-1); | |
2214 if (TYPE_P (arg)) | |
2215 vis = type_visibility (arg); | |
2216 else | |
2217 { | |
2218 if (REFERENCE_REF_P (arg)) | |
2219 arg = TREE_OPERAND (arg, 0); | |
2220 if (TREE_TYPE (arg)) | |
2221 STRIP_NOPS (arg); | |
2222 if (TREE_CODE (arg) == ADDR_EXPR) | |
2223 arg = TREE_OPERAND (arg, 0); | |
2224 if (VAR_OR_FUNCTION_DECL_P (arg)) | |
2225 { | |
2226 if (! TREE_PUBLIC (arg)) | |
2227 vis = VISIBILITY_ANON; | |
2228 else | |
2229 vis = DECL_VISIBILITY (arg); | |
2230 } | |
2231 } | |
2232 if (vis) | |
2233 constrain_visibility (decl, vis, true); | |
2234 } | |
2235 } | |
2236 | |
2237 /* Like c_determine_visibility, but with additional C++-specific | |
2238 behavior. | |
2239 | |
2240 Function-scope entities can rely on the function's visibility because | |
2241 it is set in start_preparsed_function. | |
2242 | |
2243 Class-scope entities cannot rely on the class's visibility until the end | |
2244 of the enclosing class definition. | |
2245 | |
2246 Note that because namespaces have multiple independent definitions, | |
2247 namespace visibility is handled elsewhere using the #pragma visibility | |
2248 machinery rather than by decorating the namespace declaration. | |
2249 | |
2250 The goal is for constraints from the type to give a diagnostic, and | |
2251 other constraints to be applied silently. */ | |
2252 | |
2253 void | |
2254 determine_visibility (tree decl) | |
2255 { | |
2256 /* Remember that all decls get VISIBILITY_DEFAULT when built. */ | |
2257 | |
2258 /* Only relevant for names with external linkage. */ | |
2259 if (!TREE_PUBLIC (decl)) | |
2260 return; | |
2261 | |
2262 /* Cloned constructors and destructors get the same visibility as | |
2263 the underlying function. That should be set up in | |
2264 maybe_clone_body. */ | |
2265 gcc_assert (!DECL_CLONED_FUNCTION_P (decl)); | |
2266 | |
2267 bool orig_visibility_specified = DECL_VISIBILITY_SPECIFIED (decl); | |
2268 enum symbol_visibility orig_visibility = DECL_VISIBILITY (decl); | |
2269 | |
2270 /* The decl may be a template instantiation, which could influence | |
2271 visibilty. */ | |
2272 tree template_decl = NULL_TREE; | |
2273 if (TREE_CODE (decl) == TYPE_DECL) | |
2274 { | |
2275 if (CLASS_TYPE_P (TREE_TYPE (decl))) | |
2276 { | |
2277 if (CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl))) | |
2278 template_decl = decl; | |
2279 } | |
2280 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl))) | |
2281 template_decl = decl; | |
2282 } | |
2283 else if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl)) | |
2284 template_decl = decl; | |
2285 | |
2286 /* If DECL is a member of a class, visibility specifiers on the | |
2287 class can influence the visibility of the DECL. */ | |
2288 tree class_type = NULL_TREE; | |
2289 if (DECL_CLASS_SCOPE_P (decl)) | |
2290 class_type = DECL_CONTEXT (decl); | |
2291 else | |
2292 { | |
2293 /* Not a class member. */ | |
2294 | |
2295 /* Virtual tables have DECL_CONTEXT set to their associated class, | |
2296 so they are automatically handled above. */ | |
2297 gcc_assert (!VAR_P (decl) | |
2298 || !DECL_VTABLE_OR_VTT_P (decl)); | |
2299 | |
2300 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl)) | |
2301 { | |
2302 /* Local statics and classes get the visibility of their | |
2303 containing function by default, except that | |
2304 -fvisibility-inlines-hidden doesn't affect them. */ | |
2305 tree fn = DECL_CONTEXT (decl); | |
2306 if (DECL_VISIBILITY_SPECIFIED (fn)) | |
2307 { | |
2308 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn); | |
2309 DECL_VISIBILITY_SPECIFIED (decl) = | |
2310 DECL_VISIBILITY_SPECIFIED (fn); | |
2311 } | |
2312 else | |
2313 { | |
2314 if (DECL_CLASS_SCOPE_P (fn)) | |
2315 determine_visibility_from_class (decl, DECL_CONTEXT (fn)); | |
2316 else if (determine_hidden_inline (fn)) | |
2317 { | |
2318 DECL_VISIBILITY (decl) = default_visibility; | |
2319 DECL_VISIBILITY_SPECIFIED (decl) = | |
2320 visibility_options.inpragma; | |
2321 } | |
2322 else | |
2323 { | |
2324 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn); | |
2325 DECL_VISIBILITY_SPECIFIED (decl) = | |
2326 DECL_VISIBILITY_SPECIFIED (fn); | |
2327 } | |
2328 } | |
2329 | |
2330 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set, | |
2331 but have no TEMPLATE_INFO. Their containing template | |
2332 function does, and the local class could be constrained | |
2333 by that. */ | |
2334 if (template_decl) | |
2335 template_decl = fn; | |
2336 } | |
2337 else if (VAR_P (decl) && DECL_TINFO_P (decl) | |
2338 && flag_visibility_ms_compat) | |
2339 { | |
2340 /* Under -fvisibility-ms-compat, types are visible by default, | |
2341 even though their contents aren't. */ | |
2342 tree underlying_type = TREE_TYPE (DECL_NAME (decl)); | |
2343 int underlying_vis = type_visibility (underlying_type); | |
2344 if (underlying_vis == VISIBILITY_ANON | |
2345 || (CLASS_TYPE_P (underlying_type) | |
2346 && CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type))) | |
2347 constrain_visibility (decl, underlying_vis, false); | |
2348 else | |
2349 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT; | |
2350 } | |
2351 else if (VAR_P (decl) && DECL_TINFO_P (decl)) | |
2352 { | |
2353 /* tinfo visibility is based on the type it's for. */ | |
2354 constrain_visibility | |
2355 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))), false); | |
2356 | |
2357 /* Give the target a chance to override the visibility associated | |
2358 with DECL. */ | |
2359 if (TREE_PUBLIC (decl) | |
2360 && !DECL_REALLY_EXTERN (decl) | |
2361 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl))) | |
2362 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl)))) | |
2363 targetm.cxx.determine_class_data_visibility (decl); | |
2364 } | |
2365 else if (template_decl) | |
2366 /* Template instantiations and specializations get visibility based | |
2367 on their template unless they override it with an attribute. */; | |
2368 else if (! DECL_VISIBILITY_SPECIFIED (decl)) | |
2369 { | |
2370 if (determine_hidden_inline (decl)) | |
2371 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN; | |
2372 else | |
2373 { | |
2374 /* Set default visibility to whatever the user supplied with | |
2375 #pragma GCC visibility or a namespace visibility attribute. */ | |
2376 DECL_VISIBILITY (decl) = default_visibility; | |
2377 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma; | |
2378 } | |
2379 } | |
2380 } | |
2381 | |
2382 if (template_decl) | |
2383 { | |
2384 /* If the specialization doesn't specify visibility, use the | |
2385 visibility from the template. */ | |
2386 tree tinfo = get_template_info (template_decl); | |
2387 tree args = TI_ARGS (tinfo); | |
2388 tree attribs = (TREE_CODE (decl) == TYPE_DECL | |
2389 ? TYPE_ATTRIBUTES (TREE_TYPE (decl)) | |
2390 : DECL_ATTRIBUTES (decl)); | |
2391 | |
2392 if (args != error_mark_node) | |
2393 { | |
2394 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo)); | |
2395 | |
2396 if (!DECL_VISIBILITY_SPECIFIED (decl)) | |
2397 { | |
2398 if (!DECL_VISIBILITY_SPECIFIED (pattern) | |
2399 && determine_hidden_inline (decl)) | |
2400 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN; | |
2401 else | |
2402 { | |
2403 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern); | |
2404 DECL_VISIBILITY_SPECIFIED (decl) | |
2405 = DECL_VISIBILITY_SPECIFIED (pattern); | |
2406 } | |
2407 } | |
2408 | |
2409 if (args | |
2410 /* Template argument visibility outweighs #pragma or namespace | |
2411 visibility, but not an explicit attribute. */ | |
2412 && !lookup_attribute ("visibility", attribs)) | |
2413 { | |
2414 int depth = TMPL_ARGS_DEPTH (args); | |
2415 if (DECL_VISIBILITY_SPECIFIED (decl)) | |
2416 { | |
2417 /* A class template member with explicit visibility | |
2418 overrides the class visibility, so we need to apply | |
2419 all the levels of template args directly. */ | |
2420 int i; | |
2421 for (i = 1; i <= depth; ++i) | |
2422 { | |
2423 tree lev = TMPL_ARGS_LEVEL (args, i); | |
2424 constrain_visibility_for_template (decl, lev); | |
2425 } | |
2426 } | |
2427 else if (PRIMARY_TEMPLATE_P (TI_TEMPLATE (tinfo))) | |
2428 /* Limit visibility based on its template arguments. */ | |
2429 constrain_visibility_for_template (decl, args); | |
2430 } | |
2431 } | |
2432 } | |
2433 | |
2434 if (class_type) | |
2435 determine_visibility_from_class (decl, class_type); | |
2436 | |
2437 if (decl_anon_ns_mem_p (decl)) | |
2438 /* Names in an anonymous namespace get internal linkage. | |
2439 This might change once we implement export. */ | |
2440 constrain_visibility (decl, VISIBILITY_ANON, false); | |
2441 else if (TREE_CODE (decl) != TYPE_DECL) | |
2442 { | |
2443 /* Propagate anonymity from type to decl. */ | |
2444 int tvis = type_visibility (TREE_TYPE (decl)); | |
2445 if (tvis == VISIBILITY_ANON | |
2446 || ! DECL_VISIBILITY_SPECIFIED (decl)) | |
2447 constrain_visibility (decl, tvis, false); | |
2448 } | |
2449 else if (no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/true)) | |
2450 /* DR 757: A type without linkage shall not be used as the type of a | |
2451 variable or function with linkage, unless | |
2452 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or | |
2453 o the variable or function is not used (3.2 [basic.def.odr]) or is | |
2454 defined in the same translation unit. | |
2455 | |
2456 Since non-extern "C" decls need to be defined in the same | |
2457 translation unit, we can make the type internal. */ | |
2458 constrain_visibility (decl, VISIBILITY_ANON, false); | |
2459 | |
2460 /* If visibility changed and DECL already has DECL_RTL, ensure | |
2461 symbol flags are updated. */ | |
2462 if ((DECL_VISIBILITY (decl) != orig_visibility | |
2463 || DECL_VISIBILITY_SPECIFIED (decl) != orig_visibility_specified) | |
2464 && ((VAR_P (decl) && TREE_STATIC (decl)) | |
2465 || TREE_CODE (decl) == FUNCTION_DECL) | |
2466 && DECL_RTL_SET_P (decl)) | |
2467 make_decl_rtl (decl); | |
2468 } | |
2469 | |
2470 /* By default, static data members and function members receive | |
2471 the visibility of their containing class. */ | |
2472 | |
2473 static void | |
2474 determine_visibility_from_class (tree decl, tree class_type) | |
2475 { | |
2476 if (DECL_VISIBILITY_SPECIFIED (decl)) | |
2477 return; | |
2478 | |
2479 if (determine_hidden_inline (decl)) | |
2480 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN; | |
2481 else | |
2482 { | |
2483 /* Default to the class visibility. */ | |
2484 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type); | |
2485 DECL_VISIBILITY_SPECIFIED (decl) | |
2486 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type); | |
2487 } | |
2488 | |
2489 /* Give the target a chance to override the visibility associated | |
2490 with DECL. */ | |
2491 if (VAR_P (decl) | |
2492 && (DECL_TINFO_P (decl) | |
2493 || (DECL_VTABLE_OR_VTT_P (decl) | |
2494 /* Construction virtual tables are not exported because | |
2495 they cannot be referred to from other object files; | |
2496 their name is not standardized by the ABI. */ | |
2497 && !DECL_CONSTRUCTION_VTABLE_P (decl))) | |
2498 && TREE_PUBLIC (decl) | |
2499 && !DECL_REALLY_EXTERN (decl) | |
2500 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type)) | |
2501 targetm.cxx.determine_class_data_visibility (decl); | |
2502 } | |
2503 | |
2504 /* Returns true iff DECL is an inline that should get hidden visibility | |
2505 because of -fvisibility-inlines-hidden. */ | |
2506 | |
2507 static bool | |
2508 determine_hidden_inline (tree decl) | |
2509 { | |
2510 return (visibility_options.inlines_hidden | |
2511 /* Don't do this for inline templates; specializations might not be | |
2512 inline, and we don't want them to inherit the hidden | |
2513 visibility. We'll set it here for all inline instantiations. */ | |
2514 && !processing_template_decl | |
2515 && TREE_CODE (decl) == FUNCTION_DECL | |
2516 && DECL_DECLARED_INLINE_P (decl) | |
2517 && (! DECL_LANG_SPECIFIC (decl) | |
2518 || ! DECL_EXPLICIT_INSTANTIATION (decl))); | |
2519 } | |
2520 | |
2521 /* Constrain the visibility of a class TYPE based on the visibility of its | |
2522 field types. Warn if any fields require lesser visibility. */ | |
2523 | |
2524 void | |
2525 constrain_class_visibility (tree type) | |
2526 { | |
2527 tree binfo; | |
2528 tree t; | |
2529 int i; | |
2530 | |
2531 int vis = type_visibility (type); | |
2532 | |
2533 if (vis == VISIBILITY_ANON | |
2534 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type))) | |
2535 return; | |
2536 | |
2537 /* Don't warn about visibility if the class has explicit visibility. */ | |
2538 if (CLASSTYPE_VISIBILITY_SPECIFIED (type)) | |
2539 vis = VISIBILITY_INTERNAL; | |
2540 | |
2541 for (t = TYPE_FIELDS (type); t; t = DECL_CHAIN (t)) | |
2542 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node) | |
2543 { | |
2544 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t)); | |
2545 int subvis = type_visibility (ftype); | |
2546 | |
2547 if (subvis == VISIBILITY_ANON) | |
2548 { | |
2549 if (!in_main_input_context()) | |
2550 { | |
2551 tree nlt = no_linkage_check (ftype, /*relaxed_p=*/false); | |
2552 if (nlt) | |
2553 { | |
2554 if (same_type_p (TREE_TYPE (t), nlt)) | |
2555 warning (OPT_Wsubobject_linkage, "\ | |
2556 %qT has a field %qD whose type has no linkage", | |
2557 type, t); | |
2558 else | |
2559 warning (OPT_Wsubobject_linkage, "\ | |
2560 %qT has a field %qD whose type depends on the type %qT which has no linkage", | |
2561 type, t, nlt); | |
2562 } | |
2563 else | |
2564 warning (OPT_Wsubobject_linkage, "\ | |
2565 %qT has a field %qD whose type uses the anonymous namespace", | |
2566 type, t); | |
2567 } | |
2568 } | |
2569 else if (MAYBE_CLASS_TYPE_P (ftype) | |
2570 && vis < VISIBILITY_HIDDEN | |
2571 && subvis >= VISIBILITY_HIDDEN) | |
2572 warning (OPT_Wattributes, "\ | |
2573 %qT declared with greater visibility than the type of its field %qD", | |
2574 type, t); | |
2575 } | |
2576 | |
2577 binfo = TYPE_BINFO (type); | |
2578 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i) | |
2579 { | |
2580 int subvis = type_visibility (TREE_TYPE (t)); | |
2581 | |
2582 if (subvis == VISIBILITY_ANON) | |
2583 { | |
2584 if (!in_main_input_context()) | |
2585 { | |
2586 tree nlt = no_linkage_check (TREE_TYPE (t), /*relaxed_p=*/false); | |
2587 if (nlt) | |
2588 { | |
2589 if (same_type_p (TREE_TYPE (t), nlt)) | |
2590 warning (OPT_Wsubobject_linkage, "\ | |
2591 %qT has a base %qT whose type has no linkage", | |
2592 type, TREE_TYPE (t)); | |
2593 else | |
2594 warning (OPT_Wsubobject_linkage, "\ | |
2595 %qT has a base %qT whose type depends on the type %qT which has no linkage", | |
2596 type, TREE_TYPE (t), nlt); | |
2597 } | |
2598 else | |
2599 warning (OPT_Wsubobject_linkage, "\ | |
2600 %qT has a base %qT whose type uses the anonymous namespace", | |
2601 type, TREE_TYPE (t)); | |
2602 } | |
2603 } | |
2604 else if (vis < VISIBILITY_HIDDEN | |
2605 && subvis >= VISIBILITY_HIDDEN) | |
2606 warning (OPT_Wattributes, "\ | |
2607 %qT declared with greater visibility than its base %qT", | |
2608 type, TREE_TYPE (t)); | |
2609 } | |
2610 } | |
2611 | |
2612 /* Functions for adjusting the visibility of a tagged type and its nested | |
2613 types and declarations when it gets a name for linkage purposes from a | |
2614 typedef. */ | |
2615 | |
2616 static void bt_reset_linkage_1 (binding_entry, void *); | |
2617 static void bt_reset_linkage_2 (binding_entry, void *); | |
2618 | |
2619 /* First reset the visibility of all the types. */ | |
2620 | |
2621 static void | |
2622 reset_type_linkage_1 (tree type) | |
2623 { | |
2624 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type)); | |
2625 if (CLASS_TYPE_P (type)) | |
2626 binding_table_foreach (CLASSTYPE_NESTED_UTDS (type), | |
2627 bt_reset_linkage_1, NULL); | |
2628 } | |
2629 static void | |
2630 bt_reset_linkage_1 (binding_entry b, void */*data*/) | |
2631 { | |
2632 reset_type_linkage_1 (b->type); | |
2633 } | |
2634 | |
2635 /* Then reset the visibility of any static data members or member | |
2636 functions that use those types. */ | |
2637 | |
2638 static void | |
2639 reset_decl_linkage (tree decl) | |
2640 { | |
2641 if (TREE_PUBLIC (decl)) | |
2642 return; | |
2643 if (DECL_CLONED_FUNCTION_P (decl)) | |
2644 return; | |
2645 TREE_PUBLIC (decl) = true; | |
2646 DECL_INTERFACE_KNOWN (decl) = false; | |
2647 determine_visibility (decl); | |
2648 tentative_decl_linkage (decl); | |
2649 } | |
2650 | |
2651 static void | |
2652 reset_type_linkage_2 (tree type) | |
2653 { | |
2654 if (CLASS_TYPE_P (type)) | |
2655 { | |
2656 if (tree vt = CLASSTYPE_VTABLES (type)) | |
2657 { | |
2658 tree name = mangle_vtbl_for_type (type); | |
2659 DECL_NAME (vt) = name; | |
2660 SET_DECL_ASSEMBLER_NAME (vt, name); | |
2661 reset_decl_linkage (vt); | |
2662 } | |
2663 if (tree ti = CLASSTYPE_TYPEINFO_VAR (type)) | |
2664 { | |
2665 tree name = mangle_typeinfo_for_type (type); | |
2666 DECL_NAME (ti) = name; | |
2667 SET_DECL_ASSEMBLER_NAME (ti, name); | |
2668 TREE_TYPE (name) = type; | |
2669 reset_decl_linkage (ti); | |
2670 } | |
2671 for (tree m = TYPE_FIELDS (type); m; m = DECL_CHAIN (m)) | |
2672 { | |
2673 tree mem = STRIP_TEMPLATE (m); | |
2674 if (TREE_CODE (mem) == VAR_DECL || TREE_CODE (mem) == FUNCTION_DECL) | |
2675 reset_decl_linkage (mem); | |
2676 } | |
2677 binding_table_foreach (CLASSTYPE_NESTED_UTDS (type), | |
2678 bt_reset_linkage_2, NULL); | |
2679 } | |
2680 } | |
2681 | |
2682 static void | |
2683 bt_reset_linkage_2 (binding_entry b, void */*data*/) | |
2684 { | |
2685 reset_type_linkage_2 (b->type); | |
2686 } | |
2687 void | |
2688 reset_type_linkage (tree type) | |
2689 { | |
2690 reset_type_linkage_1 (type); | |
2691 reset_type_linkage_2 (type); | |
2692 } | |
2693 | |
2694 /* Set up our initial idea of what the linkage of DECL should be. */ | |
2695 | |
2696 void | |
2697 tentative_decl_linkage (tree decl) | |
2698 { | |
2699 if (DECL_INTERFACE_KNOWN (decl)) | |
2700 /* We've already made a decision as to how this function will | |
2701 be handled. */; | |
2702 else if (vague_linkage_p (decl)) | |
2703 { | |
2704 if (TREE_CODE (decl) == FUNCTION_DECL | |
2705 && decl_defined_p (decl)) | |
2706 { | |
2707 DECL_EXTERNAL (decl) = 1; | |
2708 DECL_NOT_REALLY_EXTERN (decl) = 1; | |
2709 note_vague_linkage_fn (decl); | |
2710 /* A non-template inline function with external linkage will | |
2711 always be COMDAT. As we must eventually determine the | |
2712 linkage of all functions, and as that causes writes to | |
2713 the data mapped in from the PCH file, it's advantageous | |
2714 to mark the functions at this point. */ | |
2715 if (DECL_DECLARED_INLINE_P (decl) | |
2716 && (!DECL_IMPLICIT_INSTANTIATION (decl) | |
2717 || DECL_DEFAULTED_FN (decl))) | |
2718 { | |
2719 /* This function must have external linkage, as | |
2720 otherwise DECL_INTERFACE_KNOWN would have been | |
2721 set. */ | |
2722 gcc_assert (TREE_PUBLIC (decl)); | |
2723 comdat_linkage (decl); | |
2724 DECL_INTERFACE_KNOWN (decl) = 1; | |
2725 } | |
2726 } | |
2727 else if (VAR_P (decl)) | |
2728 maybe_commonize_var (decl); | |
2729 } | |
2730 } | |
2731 | |
2732 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage | |
2733 for DECL has not already been determined, do so now by setting | |
2734 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this | |
2735 function is called entities with vague linkage whose definitions | |
2736 are available must have TREE_PUBLIC set. | |
2737 | |
2738 If this function decides to place DECL in COMDAT, it will set | |
2739 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to | |
2740 the caller to decide whether or not to clear DECL_EXTERNAL. Some | |
2741 callers defer that decision until it is clear that DECL is actually | |
2742 required. */ | |
2743 | |
2744 void | |
2745 import_export_decl (tree decl) | |
2746 { | |
2747 int emit_p; | |
2748 bool comdat_p; | |
2749 bool import_p; | |
2750 tree class_type = NULL_TREE; | |
2751 | |
2752 if (DECL_INTERFACE_KNOWN (decl)) | |
2753 return; | |
2754 | |
2755 /* We cannot determine what linkage to give to an entity with vague | |
2756 linkage until the end of the file. For example, a virtual table | |
2757 for a class will be defined if and only if the key method is | |
2758 defined in this translation unit. As a further example, consider | |
2759 that when compiling a translation unit that uses PCH file with | |
2760 "-frepo" it would be incorrect to make decisions about what | |
2761 entities to emit when building the PCH; those decisions must be | |
2762 delayed until the repository information has been processed. */ | |
2763 gcc_assert (at_eof); | |
2764 /* Object file linkage for explicit instantiations is handled in | |
2765 mark_decl_instantiated. For static variables in functions with | |
2766 vague linkage, maybe_commonize_var is used. | |
2767 | |
2768 Therefore, the only declarations that should be provided to this | |
2769 function are those with external linkage that are: | |
2770 | |
2771 * implicit instantiations of function templates | |
2772 | |
2773 * inline function | |
2774 | |
2775 * implicit instantiations of static data members of class | |
2776 templates | |
2777 | |
2778 * virtual tables | |
2779 | |
2780 * typeinfo objects | |
2781 | |
2782 Furthermore, all entities that reach this point must have a | |
2783 definition available in this translation unit. | |
2784 | |
2785 The following assertions check these conditions. */ | |
2786 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl)); | |
2787 /* Any code that creates entities with TREE_PUBLIC cleared should | |
2788 also set DECL_INTERFACE_KNOWN. */ | |
2789 gcc_assert (TREE_PUBLIC (decl)); | |
2790 if (TREE_CODE (decl) == FUNCTION_DECL) | |
2791 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl) | |
2792 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl) | |
2793 || DECL_DECLARED_INLINE_P (decl)); | |
2794 else | |
2795 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl) | |
2796 || DECL_VTABLE_OR_VTT_P (decl) | |
2797 || DECL_TINFO_P (decl)); | |
2798 /* Check that a definition of DECL is available in this translation | |
2799 unit. */ | |
2800 gcc_assert (!DECL_REALLY_EXTERN (decl)); | |
2801 | |
2802 /* Assume that DECL will not have COMDAT linkage. */ | |
2803 comdat_p = false; | |
2804 /* Assume that DECL will not be imported into this translation | |
2805 unit. */ | |
2806 import_p = false; | |
2807 | |
2808 /* See if the repository tells us whether or not to emit DECL in | |
2809 this translation unit. */ | |
2810 emit_p = repo_emit_p (decl); | |
2811 if (emit_p == 0) | |
2812 import_p = true; | |
2813 else if (emit_p == 1) | |
2814 { | |
2815 /* The repository indicates that this entity should be defined | |
2816 here. Make sure the back end honors that request. */ | |
2817 mark_needed (decl); | |
2818 /* Output the definition as an ordinary strong definition. */ | |
2819 DECL_EXTERNAL (decl) = 0; | |
2820 DECL_INTERFACE_KNOWN (decl) = 1; | |
2821 return; | |
2822 } | |
2823 | |
2824 if (import_p) | |
2825 /* We have already decided what to do with this DECL; there is no | |
2826 need to check anything further. */ | |
2827 ; | |
2828 else if (VAR_P (decl) && DECL_VTABLE_OR_VTT_P (decl)) | |
2829 { | |
2830 class_type = DECL_CONTEXT (decl); | |
2831 import_export_class (class_type); | |
2832 if (CLASSTYPE_INTERFACE_KNOWN (class_type) | |
2833 && CLASSTYPE_INTERFACE_ONLY (class_type)) | |
2834 import_p = true; | |
2835 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC) | |
2836 && !CLASSTYPE_USE_TEMPLATE (class_type) | |
2837 && CLASSTYPE_KEY_METHOD (class_type) | |
2838 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))) | |
2839 /* The ABI requires that all virtual tables be emitted with | |
2840 COMDAT linkage. However, on systems where COMDAT symbols | |
2841 don't show up in the table of contents for a static | |
2842 archive, or on systems without weak symbols (where we | |
2843 approximate COMDAT linkage by using internal linkage), the | |
2844 linker will report errors about undefined symbols because | |
2845 it will not see the virtual table definition. Therefore, | |
2846 in the case that we know that the virtual table will be | |
2847 emitted in only one translation unit, we make the virtual | |
2848 table an ordinary definition with external linkage. */ | |
2849 DECL_EXTERNAL (decl) = 0; | |
2850 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)) | |
2851 { | |
2852 /* CLASS_TYPE is being exported from this translation unit, | |
2853 so DECL should be defined here. */ | |
2854 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type)) | |
2855 /* If a class is declared in a header with the "extern | |
2856 template" extension, then it will not be instantiated, | |
2857 even in translation units that would normally require | |
2858 it. Often such classes are explicitly instantiated in | |
2859 one translation unit. Therefore, the explicit | |
2860 instantiation must be made visible to other translation | |
2861 units. */ | |
2862 DECL_EXTERNAL (decl) = 0; | |
2863 else | |
2864 { | |
2865 /* The generic C++ ABI says that class data is always | |
2866 COMDAT, even if there is a key function. Some | |
2867 variants (e.g., the ARM EABI) says that class data | |
2868 only has COMDAT linkage if the class data might be | |
2869 emitted in more than one translation unit. When the | |
2870 key method can be inline and is inline, we still have | |
2871 to arrange for comdat even though | |
2872 class_data_always_comdat is false. */ | |
2873 if (!CLASSTYPE_KEY_METHOD (class_type) | |
2874 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)) | |
2875 || targetm.cxx.class_data_always_comdat ()) | |
2876 { | |
2877 /* The ABI requires COMDAT linkage. Normally, we | |
2878 only emit COMDAT things when they are needed; | |
2879 make sure that we realize that this entity is | |
2880 indeed needed. */ | |
2881 comdat_p = true; | |
2882 mark_needed (decl); | |
2883 } | |
2884 } | |
2885 } | |
2886 else if (!flag_implicit_templates | |
2887 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type)) | |
2888 import_p = true; | |
2889 else | |
2890 comdat_p = true; | |
2891 } | |
2892 else if (VAR_P (decl) && DECL_TINFO_P (decl)) | |
2893 { | |
2894 tree type = TREE_TYPE (DECL_NAME (decl)); | |
2895 if (CLASS_TYPE_P (type)) | |
2896 { | |
2897 class_type = type; | |
2898 import_export_class (type); | |
2899 if (CLASSTYPE_INTERFACE_KNOWN (type) | |
2900 && TYPE_POLYMORPHIC_P (type) | |
2901 && CLASSTYPE_INTERFACE_ONLY (type) | |
2902 /* If -fno-rtti was specified, then we cannot be sure | |
2903 that RTTI information will be emitted with the | |
2904 virtual table of the class, so we must emit it | |
2905 wherever it is used. */ | |
2906 && flag_rtti) | |
2907 import_p = true; | |
2908 else | |
2909 { | |
2910 if (CLASSTYPE_INTERFACE_KNOWN (type) | |
2911 && !CLASSTYPE_INTERFACE_ONLY (type)) | |
2912 { | |
2913 comdat_p = (targetm.cxx.class_data_always_comdat () | |
2914 || (CLASSTYPE_KEY_METHOD (type) | |
2915 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type)))); | |
2916 mark_needed (decl); | |
2917 if (!flag_weak) | |
2918 { | |
2919 comdat_p = false; | |
2920 DECL_EXTERNAL (decl) = 0; | |
2921 } | |
2922 } | |
2923 else | |
2924 comdat_p = true; | |
2925 } | |
2926 } | |
2927 else | |
2928 comdat_p = true; | |
2929 } | |
2930 else if (DECL_TEMPLOID_INSTANTIATION (decl)) | |
2931 { | |
2932 /* DECL is an implicit instantiation of a function or static | |
2933 data member. */ | |
2934 if ((flag_implicit_templates | |
2935 && !flag_use_repository) | |
2936 || (flag_implicit_inline_templates | |
2937 && TREE_CODE (decl) == FUNCTION_DECL | |
2938 && DECL_DECLARED_INLINE_P (decl))) | |
2939 comdat_p = true; | |
2940 else | |
2941 /* If we are not implicitly generating templates, then mark | |
2942 this entity as undefined in this translation unit. */ | |
2943 import_p = true; | |
2944 } | |
2945 else if (DECL_FUNCTION_MEMBER_P (decl)) | |
2946 { | |
2947 if (!DECL_DECLARED_INLINE_P (decl)) | |
2948 { | |
2949 tree ctype = DECL_CONTEXT (decl); | |
2950 import_export_class (ctype); | |
2951 if (CLASSTYPE_INTERFACE_KNOWN (ctype)) | |
2952 { | |
2953 DECL_NOT_REALLY_EXTERN (decl) | |
2954 = ! (CLASSTYPE_INTERFACE_ONLY (ctype) | |
2955 || (DECL_DECLARED_INLINE_P (decl) | |
2956 && ! flag_implement_inlines | |
2957 && !DECL_VINDEX (decl))); | |
2958 | |
2959 if (!DECL_NOT_REALLY_EXTERN (decl)) | |
2960 DECL_EXTERNAL (decl) = 1; | |
2961 | |
2962 /* Always make artificials weak. */ | |
2963 if (DECL_ARTIFICIAL (decl) && flag_weak) | |
2964 comdat_p = true; | |
2965 else | |
2966 maybe_make_one_only (decl); | |
2967 } | |
2968 } | |
2969 else | |
2970 comdat_p = true; | |
2971 } | |
2972 else | |
2973 comdat_p = true; | |
2974 | |
2975 if (import_p) | |
2976 { | |
2977 /* If we are importing DECL into this translation unit, mark is | |
2978 an undefined here. */ | |
2979 DECL_EXTERNAL (decl) = 1; | |
2980 DECL_NOT_REALLY_EXTERN (decl) = 0; | |
2981 } | |
2982 else if (comdat_p) | |
2983 { | |
2984 /* If we decided to put DECL in COMDAT, mark it accordingly at | |
2985 this point. */ | |
2986 comdat_linkage (decl); | |
2987 } | |
2988 | |
2989 DECL_INTERFACE_KNOWN (decl) = 1; | |
2990 } | |
2991 | |
2992 /* Return an expression that performs the destruction of DECL, which | |
2993 must be a VAR_DECL whose type has a non-trivial destructor, or is | |
2994 an array whose (innermost) elements have a non-trivial destructor. */ | |
2995 | |
2996 tree | |
2997 build_cleanup (tree decl) | |
2998 { | |
2999 tree clean = cxx_maybe_build_cleanup (decl, tf_warning_or_error); | |
3000 gcc_assert (clean != NULL_TREE); | |
3001 return clean; | |
3002 } | |
3003 | |
3004 /* Returns the initialization guard variable for the variable DECL, | |
3005 which has static storage duration. */ | |
3006 | |
3007 tree | |
3008 get_guard (tree decl) | |
3009 { | |
3010 tree sname; | |
3011 tree guard; | |
3012 | |
3013 sname = mangle_guard_variable (decl); | |
3014 guard = get_global_binding (sname); | |
3015 if (! guard) | |
3016 { | |
3017 tree guard_type; | |
3018 | |
3019 /* We use a type that is big enough to contain a mutex as well | |
3020 as an integer counter. */ | |
3021 guard_type = targetm.cxx.guard_type (); | |
3022 guard = build_decl (DECL_SOURCE_LOCATION (decl), | |
3023 VAR_DECL, sname, guard_type); | |
3024 | |
3025 /* The guard should have the same linkage as what it guards. */ | |
3026 TREE_PUBLIC (guard) = TREE_PUBLIC (decl); | |
3027 TREE_STATIC (guard) = TREE_STATIC (decl); | |
3028 DECL_COMMON (guard) = DECL_COMMON (decl); | |
3029 DECL_COMDAT (guard) = DECL_COMDAT (decl); | |
3030 CP_DECL_THREAD_LOCAL_P (guard) = CP_DECL_THREAD_LOCAL_P (decl); | |
3031 set_decl_tls_model (guard, DECL_TLS_MODEL (decl)); | |
3032 if (DECL_ONE_ONLY (decl)) | |
3033 make_decl_one_only (guard, cxx_comdat_group (guard)); | |
3034 if (TREE_PUBLIC (decl)) | |
3035 DECL_WEAK (guard) = DECL_WEAK (decl); | |
3036 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl); | |
3037 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl); | |
3038 | |
3039 DECL_ARTIFICIAL (guard) = 1; | |
3040 DECL_IGNORED_P (guard) = 1; | |
3041 TREE_USED (guard) = 1; | |
3042 pushdecl_top_level_and_finish (guard, NULL_TREE); | |
3043 } | |
3044 return guard; | |
3045 } | |
3046 | |
3047 /* Return an atomic load of src with the appropriate memory model. */ | |
3048 | |
3049 static tree | |
3050 build_atomic_load_byte (tree src, HOST_WIDE_INT model) | |
3051 { | |
3052 tree ptr_type = build_pointer_type (char_type_node); | |
3053 tree mem_model = build_int_cst (integer_type_node, model); | |
3054 tree t, addr, val; | |
3055 unsigned int size; | |
3056 int fncode; | |
3057 | |
3058 size = tree_to_uhwi (TYPE_SIZE_UNIT (char_type_node)); | |
3059 | |
3060 fncode = BUILT_IN_ATOMIC_LOAD_N + exact_log2 (size) + 1; | |
3061 t = builtin_decl_implicit ((enum built_in_function) fncode); | |
3062 | |
3063 addr = build1 (ADDR_EXPR, ptr_type, src); | |
3064 val = build_call_expr (t, 2, addr, mem_model); | |
3065 return val; | |
3066 } | |
3067 | |
3068 /* Return those bits of the GUARD variable that should be set when the | |
3069 guarded entity is actually initialized. */ | |
3070 | |
3071 static tree | |
3072 get_guard_bits (tree guard) | |
3073 { | |
3074 if (!targetm.cxx.guard_mask_bit ()) | |
3075 { | |
3076 /* We only set the first byte of the guard, in order to leave room | |
3077 for a mutex in the high-order bits. */ | |
3078 guard = build1 (ADDR_EXPR, | |
3079 build_pointer_type (TREE_TYPE (guard)), | |
3080 guard); | |
3081 guard = build1 (NOP_EXPR, | |
3082 build_pointer_type (char_type_node), | |
3083 guard); | |
3084 guard = build1 (INDIRECT_REF, char_type_node, guard); | |
3085 } | |
3086 | |
3087 return guard; | |
3088 } | |
3089 | |
3090 /* Return an expression which determines whether or not the GUARD | |
3091 variable has already been initialized. */ | |
3092 | |
3093 tree | |
3094 get_guard_cond (tree guard, bool thread_safe) | |
3095 { | |
3096 tree guard_value; | |
3097 | |
3098 if (!thread_safe) | |
3099 guard = get_guard_bits (guard); | |
3100 else | |
3101 guard = build_atomic_load_byte (guard, MEMMODEL_ACQUIRE); | |
3102 | |
3103 /* Mask off all but the low bit. */ | |
3104 if (targetm.cxx.guard_mask_bit ()) | |
3105 { | |
3106 guard_value = integer_one_node; | |
3107 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard))) | |
3108 guard_value = fold_convert (TREE_TYPE (guard), guard_value); | |
3109 guard = cp_build_binary_op (input_location, | |
3110 BIT_AND_EXPR, guard, guard_value, | |
3111 tf_warning_or_error); | |
3112 } | |
3113 | |
3114 guard_value = integer_zero_node; | |
3115 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard))) | |
3116 guard_value = fold_convert (TREE_TYPE (guard), guard_value); | |
3117 return cp_build_binary_op (input_location, | |
3118 EQ_EXPR, guard, guard_value, | |
3119 tf_warning_or_error); | |
3120 } | |
3121 | |
3122 /* Return an expression which sets the GUARD variable, indicating that | |
3123 the variable being guarded has been initialized. */ | |
3124 | |
3125 tree | |
3126 set_guard (tree guard) | |
3127 { | |
3128 tree guard_init; | |
3129 | |
3130 /* Set the GUARD to one. */ | |
3131 guard = get_guard_bits (guard); | |
3132 guard_init = integer_one_node; | |
3133 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard))) | |
3134 guard_init = fold_convert (TREE_TYPE (guard), guard_init); | |
3135 return cp_build_modify_expr (input_location, guard, NOP_EXPR, guard_init, | |
3136 tf_warning_or_error); | |
3137 } | |
3138 | |
3139 /* Returns true iff we can tell that VAR does not have a dynamic | |
3140 initializer. */ | |
3141 | |
3142 static bool | |
3143 var_defined_without_dynamic_init (tree var) | |
3144 { | |
3145 /* If it's defined in another TU, we can't tell. */ | |
3146 if (DECL_EXTERNAL (var)) | |
3147 return false; | |
3148 /* If it has a non-trivial destructor, registering the destructor | |
3149 counts as dynamic initialization. */ | |
3150 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (var))) | |
3151 return false; | |
3152 /* If it's in this TU, its initializer has been processed, unless | |
3153 it's a case of self-initialization, then DECL_INITIALIZED_P is | |
3154 false while the initializer is handled by finish_id_expression. */ | |
3155 if (!DECL_INITIALIZED_P (var)) | |
3156 return false; | |
3157 /* If it has no initializer or a constant one, it's not dynamic. */ | |
3158 return (!DECL_NONTRIVIALLY_INITIALIZED_P (var) | |
3159 || DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (var)); | |
3160 } | |
3161 | |
3162 /* Returns true iff VAR is a variable that needs uses to be | |
3163 wrapped for possible dynamic initialization. */ | |
3164 | |
3165 static bool | |
3166 var_needs_tls_wrapper (tree var) | |
3167 { | |
3168 return (!error_operand_p (var) | |
3169 && CP_DECL_THREAD_LOCAL_P (var) | |
3170 && !DECL_GNU_TLS_P (var) | |
3171 && !DECL_FUNCTION_SCOPE_P (var) | |
3172 && !var_defined_without_dynamic_init (var)); | |
3173 } | |
3174 | |
3175 /* Get the FUNCTION_DECL for the shared TLS init function for this | |
3176 translation unit. */ | |
3177 | |
3178 static tree | |
3179 get_local_tls_init_fn (void) | |
3180 { | |
3181 tree sname = get_identifier ("__tls_init"); | |
3182 tree fn = get_global_binding (sname); | |
3183 if (!fn) | |
3184 { | |
3185 fn = build_lang_decl (FUNCTION_DECL, sname, | |
3186 build_function_type (void_type_node, | |
3187 void_list_node)); | |
3188 SET_DECL_LANGUAGE (fn, lang_c); | |
3189 TREE_PUBLIC (fn) = false; | |
3190 DECL_ARTIFICIAL (fn) = true; | |
3191 mark_used (fn); | |
3192 set_global_binding (fn); | |
3193 } | |
3194 return fn; | |
3195 } | |
3196 | |
3197 /* Get a FUNCTION_DECL for the init function for the thread_local | |
3198 variable VAR. The init function will be an alias to the function | |
3199 that initializes all the non-local TLS variables in the translation | |
3200 unit. The init function is only used by the wrapper function. */ | |
3201 | |
3202 static tree | |
3203 get_tls_init_fn (tree var) | |
3204 { | |
3205 /* Only C++11 TLS vars need this init fn. */ | |
3206 if (!var_needs_tls_wrapper (var)) | |
3207 return NULL_TREE; | |
3208 | |
3209 /* If -fno-extern-tls-init, assume that we don't need to call | |
3210 a tls init function for a variable defined in another TU. */ | |
3211 if (!flag_extern_tls_init && DECL_EXTERNAL (var)) | |
3212 return NULL_TREE; | |
3213 | |
3214 /* If the variable is internal, or if we can't generate aliases, | |
3215 call the local init function directly. */ | |
3216 if (!TREE_PUBLIC (var) || !TARGET_SUPPORTS_ALIASES) | |
3217 return get_local_tls_init_fn (); | |
3218 | |
3219 tree sname = mangle_tls_init_fn (var); | |
3220 tree fn = get_global_binding (sname); | |
3221 if (!fn) | |
3222 { | |
3223 fn = build_lang_decl (FUNCTION_DECL, sname, | |
3224 build_function_type (void_type_node, | |
3225 void_list_node)); | |
3226 SET_DECL_LANGUAGE (fn, lang_c); | |
3227 TREE_PUBLIC (fn) = TREE_PUBLIC (var); | |
3228 DECL_ARTIFICIAL (fn) = true; | |
3229 DECL_COMDAT (fn) = DECL_COMDAT (var); | |
3230 DECL_EXTERNAL (fn) = DECL_EXTERNAL (var); | |
3231 if (DECL_ONE_ONLY (var)) | |
3232 make_decl_one_only (fn, cxx_comdat_group (fn)); | |
3233 if (TREE_PUBLIC (var)) | |
3234 { | |
3235 tree obtype = strip_array_types (non_reference (TREE_TYPE (var))); | |
3236 /* If the variable is defined somewhere else and might have static | |
3237 initialization, make the init function a weak reference. */ | |
3238 if ((!TYPE_NEEDS_CONSTRUCTING (obtype) | |
3239 || TYPE_HAS_CONSTEXPR_CTOR (obtype)) | |
3240 && TYPE_HAS_TRIVIAL_DESTRUCTOR (obtype) | |
3241 && DECL_EXTERNAL (var)) | |
3242 declare_weak (fn); | |
3243 else | |
3244 DECL_WEAK (fn) = DECL_WEAK (var); | |
3245 } | |
3246 DECL_VISIBILITY (fn) = DECL_VISIBILITY (var); | |
3247 DECL_VISIBILITY_SPECIFIED (fn) = DECL_VISIBILITY_SPECIFIED (var); | |
3248 DECL_DLLIMPORT_P (fn) = DECL_DLLIMPORT_P (var); | |
3249 DECL_IGNORED_P (fn) = 1; | |
3250 mark_used (fn); | |
3251 | |
3252 DECL_BEFRIENDING_CLASSES (fn) = var; | |
3253 | |
3254 set_global_binding (fn); | |
3255 } | |
3256 return fn; | |
3257 } | |
3258 | |
3259 /* Get a FUNCTION_DECL for the init wrapper function for the thread_local | |
3260 variable VAR. The wrapper function calls the init function (if any) for | |
3261 VAR and then returns a reference to VAR. The wrapper function is used | |
3262 in place of VAR everywhere VAR is mentioned. */ | |
3263 | |
3264 tree | |
3265 get_tls_wrapper_fn (tree var) | |
3266 { | |
3267 /* Only C++11 TLS vars need this wrapper fn. */ | |
3268 if (!var_needs_tls_wrapper (var)) | |
3269 return NULL_TREE; | |
3270 | |
3271 tree sname = mangle_tls_wrapper_fn (var); | |
3272 tree fn = get_global_binding (sname); | |
3273 if (!fn) | |
3274 { | |
3275 /* A named rvalue reference is an lvalue, so the wrapper should | |
3276 always return an lvalue reference. */ | |
3277 tree type = non_reference (TREE_TYPE (var)); | |
3278 type = build_reference_type (type); | |
3279 tree fntype = build_function_type (type, void_list_node); | |
3280 fn = build_lang_decl (FUNCTION_DECL, sname, fntype); | |
3281 SET_DECL_LANGUAGE (fn, lang_c); | |
3282 TREE_PUBLIC (fn) = TREE_PUBLIC (var); | |
3283 DECL_ARTIFICIAL (fn) = true; | |
3284 DECL_IGNORED_P (fn) = 1; | |
3285 /* The wrapper is inline and emitted everywhere var is used. */ | |
3286 DECL_DECLARED_INLINE_P (fn) = true; | |
3287 if (TREE_PUBLIC (var)) | |
3288 { | |
3289 comdat_linkage (fn); | |
3290 #ifdef HAVE_GAS_HIDDEN | |
3291 /* Make the wrapper bind locally; there's no reason to share | |
3292 the wrapper between multiple shared objects. */ | |
3293 DECL_VISIBILITY (fn) = VISIBILITY_INTERNAL; | |
3294 DECL_VISIBILITY_SPECIFIED (fn) = true; | |
3295 #endif | |
3296 } | |
3297 if (!TREE_PUBLIC (fn)) | |
3298 DECL_INTERFACE_KNOWN (fn) = true; | |
3299 mark_used (fn); | |
3300 note_vague_linkage_fn (fn); | |
3301 | |
3302 #if 0 | |
3303 /* We want CSE to commonize calls to the wrapper, but marking it as | |
3304 pure is unsafe since it has side-effects. I guess we need a new | |
3305 ECF flag even weaker than ECF_PURE. FIXME! */ | |
3306 DECL_PURE_P (fn) = true; | |
3307 #endif | |
3308 | |
3309 DECL_BEFRIENDING_CLASSES (fn) = var; | |
3310 | |
3311 set_global_binding (fn); | |
3312 } | |
3313 return fn; | |
3314 } | |
3315 | |
3316 /* At EOF, generate the definition for the TLS wrapper function FN: | |
3317 | |
3318 T& var_wrapper() { | |
3319 if (init_fn) init_fn(); | |
3320 return var; | |
3321 } */ | |
3322 | |
3323 static void | |
3324 generate_tls_wrapper (tree fn) | |
3325 { | |
3326 tree var = DECL_BEFRIENDING_CLASSES (fn); | |
3327 | |
3328 start_preparsed_function (fn, NULL_TREE, SF_DEFAULT | SF_PRE_PARSED); | |
3329 tree body = begin_function_body (); | |
3330 /* Only call the init fn if there might be one. */ | |
3331 if (tree init_fn = get_tls_init_fn (var)) | |
3332 { | |
3333 tree if_stmt = NULL_TREE; | |
3334 /* If init_fn is a weakref, make sure it exists before calling. */ | |
3335 if (lookup_attribute ("weak", DECL_ATTRIBUTES (init_fn))) | |
3336 { | |
3337 if_stmt = begin_if_stmt (); | |
3338 tree addr = cp_build_addr_expr (init_fn, tf_warning_or_error); | |
3339 tree cond = cp_build_binary_op (DECL_SOURCE_LOCATION (var), | |
3340 NE_EXPR, addr, nullptr_node, | |
3341 tf_warning_or_error); | |
3342 finish_if_stmt_cond (cond, if_stmt); | |
3343 } | |
3344 finish_expr_stmt (build_cxx_call | |
3345 (init_fn, 0, NULL, tf_warning_or_error)); | |
3346 if (if_stmt) | |
3347 { | |
3348 finish_then_clause (if_stmt); | |
3349 finish_if_stmt (if_stmt); | |
3350 } | |
3351 } | |
3352 else | |
3353 /* If there's no initialization, the wrapper is a constant function. */ | |
3354 TREE_READONLY (fn) = true; | |
3355 finish_return_stmt (convert_from_reference (var)); | |
3356 finish_function_body (body); | |
3357 expand_or_defer_fn (finish_function (/*inline_p=*/false)); | |
3358 } | |
3359 | |
3360 /* Start the process of running a particular set of global constructors | |
3361 or destructors. Subroutine of do_[cd]tors. Also called from | |
3362 vtv_start_verification_constructor_init_function. */ | |
3363 | |
3364 static tree | |
3365 start_objects (int method_type, int initp) | |
3366 { | |
3367 tree body; | |
3368 tree fndecl; | |
3369 char type[14]; | |
3370 | |
3371 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */ | |
3372 | |
3373 if (initp != DEFAULT_INIT_PRIORITY) | |
3374 { | |
3375 char joiner; | |
3376 | |
3377 #ifdef JOINER | |
3378 joiner = JOINER; | |
3379 #else | |
3380 joiner = '_'; | |
3381 #endif | |
3382 | |
3383 sprintf (type, "sub_%c%c%.5u", method_type, joiner, initp); | |
3384 } | |
3385 else | |
3386 sprintf (type, "sub_%c", method_type); | |
3387 | |
3388 fndecl = build_lang_decl (FUNCTION_DECL, | |
3389 get_file_function_name (type), | |
3390 build_function_type_list (void_type_node, | |
3391 NULL_TREE)); | |
3392 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED); | |
3393 | |
3394 TREE_PUBLIC (current_function_decl) = 0; | |
3395 | |
3396 /* Mark as artificial because it's not explicitly in the user's | |
3397 source code. */ | |
3398 DECL_ARTIFICIAL (current_function_decl) = 1; | |
3399 | |
3400 /* Mark this declaration as used to avoid spurious warnings. */ | |
3401 TREE_USED (current_function_decl) = 1; | |
3402 | |
3403 /* Mark this function as a global constructor or destructor. */ | |
3404 if (method_type == 'I') | |
3405 DECL_GLOBAL_CTOR_P (current_function_decl) = 1; | |
3406 else | |
3407 DECL_GLOBAL_DTOR_P (current_function_decl) = 1; | |
3408 | |
3409 body = begin_compound_stmt (BCS_FN_BODY); | |
3410 | |
3411 return body; | |
3412 } | |
3413 | |
3414 /* Finish the process of running a particular set of global constructors | |
3415 or destructors. Subroutine of do_[cd]tors. */ | |
3416 | |
3417 static void | |
3418 finish_objects (int method_type, int initp, tree body) | |
3419 { | |
3420 tree fn; | |
3421 | |
3422 /* Finish up. */ | |
3423 finish_compound_stmt (body); | |
3424 fn = finish_function (/*inline_p=*/false); | |
3425 | |
3426 if (method_type == 'I') | |
3427 { | |
3428 DECL_STATIC_CONSTRUCTOR (fn) = 1; | |
3429 decl_init_priority_insert (fn, initp); | |
3430 } | |
3431 else | |
3432 { | |
3433 DECL_STATIC_DESTRUCTOR (fn) = 1; | |
3434 decl_fini_priority_insert (fn, initp); | |
3435 } | |
3436 | |
3437 expand_or_defer_fn (fn); | |
3438 } | |
3439 | |
3440 /* The names of the parameters to the function created to handle | |
3441 initializations and destructions for objects with static storage | |
3442 duration. */ | |
3443 #define INITIALIZE_P_IDENTIFIER "__initialize_p" | |
3444 #define PRIORITY_IDENTIFIER "__priority" | |
3445 | |
3446 /* The name of the function we create to handle initializations and | |
3447 destructions for objects with static storage duration. */ | |
3448 #define SSDF_IDENTIFIER "__static_initialization_and_destruction" | |
3449 | |
3450 /* The declaration for the __INITIALIZE_P argument. */ | |
3451 static GTY(()) tree initialize_p_decl; | |
3452 | |
3453 /* The declaration for the __PRIORITY argument. */ | |
3454 static GTY(()) tree priority_decl; | |
3455 | |
3456 /* The declaration for the static storage duration function. */ | |
3457 static GTY(()) tree ssdf_decl; | |
3458 | |
3459 /* All the static storage duration functions created in this | |
3460 translation unit. */ | |
3461 static GTY(()) vec<tree, va_gc> *ssdf_decls; | |
3462 | |
3463 /* A map from priority levels to information about that priority | |
3464 level. There may be many such levels, so efficient lookup is | |
3465 important. */ | |
3466 static splay_tree priority_info_map; | |
3467 | |
3468 /* Begins the generation of the function that will handle all | |
3469 initialization and destruction of objects with static storage | |
3470 duration. The function generated takes two parameters of type | |
3471 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is | |
3472 nonzero, it performs initializations. Otherwise, it performs | |
3473 destructions. It only performs those initializations or | |
3474 destructions with the indicated __PRIORITY. The generated function | |
3475 returns no value. | |
3476 | |
3477 It is assumed that this function will only be called once per | |
3478 translation unit. */ | |
3479 | |
3480 static tree | |
3481 start_static_storage_duration_function (unsigned count) | |
3482 { | |
3483 tree type; | |
3484 tree body; | |
3485 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32]; | |
3486 | |
3487 /* Create the identifier for this function. It will be of the form | |
3488 SSDF_IDENTIFIER_<number>. */ | |
3489 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count); | |
3490 | |
3491 type = build_function_type_list (void_type_node, | |
3492 integer_type_node, integer_type_node, | |
3493 NULL_TREE); | |
3494 | |
3495 /* Create the FUNCTION_DECL itself. */ | |
3496 ssdf_decl = build_lang_decl (FUNCTION_DECL, | |
3497 get_identifier (id), | |
3498 type); | |
3499 TREE_PUBLIC (ssdf_decl) = 0; | |
3500 DECL_ARTIFICIAL (ssdf_decl) = 1; | |
3501 | |
3502 /* Put this function in the list of functions to be called from the | |
3503 static constructors and destructors. */ | |
3504 if (!ssdf_decls) | |
3505 { | |
3506 vec_alloc (ssdf_decls, 32); | |
3507 | |
3508 /* Take this opportunity to initialize the map from priority | |
3509 numbers to information about that priority level. */ | |
3510 priority_info_map = splay_tree_new (splay_tree_compare_ints, | |
3511 /*delete_key_fn=*/0, | |
3512 /*delete_value_fn=*/ | |
3513 (splay_tree_delete_value_fn) &free); | |
3514 | |
3515 /* We always need to generate functions for the | |
3516 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk | |
3517 priorities later, we'll be sure to find the | |
3518 DEFAULT_INIT_PRIORITY. */ | |
3519 get_priority_info (DEFAULT_INIT_PRIORITY); | |
3520 } | |
3521 | |
3522 vec_safe_push (ssdf_decls, ssdf_decl); | |
3523 | |
3524 /* Create the argument list. */ | |
3525 initialize_p_decl = cp_build_parm_decl | |
3526 (ssdf_decl, get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node); | |
3527 TREE_USED (initialize_p_decl) = 1; | |
3528 priority_decl = cp_build_parm_decl | |
3529 (ssdf_decl, get_identifier (PRIORITY_IDENTIFIER), integer_type_node); | |
3530 TREE_USED (priority_decl) = 1; | |
3531 | |
3532 DECL_CHAIN (initialize_p_decl) = priority_decl; | |
3533 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl; | |
3534 | |
3535 /* Put the function in the global scope. */ | |
3536 pushdecl (ssdf_decl); | |
3537 | |
3538 /* Start the function itself. This is equivalent to declaring the | |
3539 function as: | |
3540 | |
3541 static void __ssdf (int __initialize_p, init __priority_p); | |
3542 | |
3543 It is static because we only need to call this function from the | |
3544 various constructor and destructor functions for this module. */ | |
3545 start_preparsed_function (ssdf_decl, | |
3546 /*attrs=*/NULL_TREE, | |
3547 SF_PRE_PARSED); | |
3548 | |
3549 /* Set up the scope of the outermost block in the function. */ | |
3550 body = begin_compound_stmt (BCS_FN_BODY); | |
3551 | |
3552 return body; | |
3553 } | |
3554 | |
3555 /* Finish the generation of the function which performs initialization | |
3556 and destruction of objects with static storage duration. After | |
3557 this point, no more such objects can be created. */ | |
3558 | |
3559 static void | |
3560 finish_static_storage_duration_function (tree body) | |
3561 { | |
3562 /* Close out the function. */ | |
3563 finish_compound_stmt (body); | |
3564 expand_or_defer_fn (finish_function (/*inline_p=*/false)); | |
3565 } | |
3566 | |
3567 /* Return the information about the indicated PRIORITY level. If no | |
3568 code to handle this level has yet been generated, generate the | |
3569 appropriate prologue. */ | |
3570 | |
3571 static priority_info | |
3572 get_priority_info (int priority) | |
3573 { | |
3574 priority_info pi; | |
3575 splay_tree_node n; | |
3576 | |
3577 n = splay_tree_lookup (priority_info_map, | |
3578 (splay_tree_key) priority); | |
3579 if (!n) | |
3580 { | |
3581 /* Create a new priority information structure, and insert it | |
3582 into the map. */ | |
3583 pi = XNEW (struct priority_info_s); | |
3584 pi->initializations_p = 0; | |
3585 pi->destructions_p = 0; | |
3586 splay_tree_insert (priority_info_map, | |
3587 (splay_tree_key) priority, | |
3588 (splay_tree_value) pi); | |
3589 } | |
3590 else | |
3591 pi = (priority_info) n->value; | |
3592 | |
3593 return pi; | |
3594 } | |
3595 | |
3596 /* The effective initialization priority of a DECL. */ | |
3597 | |
3598 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \ | |
3599 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \ | |
3600 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl)) | |
3601 | |
3602 /* Whether a DECL needs a guard to protect it against multiple | |
3603 initialization. */ | |
3604 | |
3605 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \ | |
3606 || DECL_ONE_ONLY (decl) \ | |
3607 || DECL_WEAK (decl))) | |
3608 | |
3609 /* Called from one_static_initialization_or_destruction(), | |
3610 via walk_tree. | |
3611 Walks the initializer list of a global variable and looks for | |
3612 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0) | |
3613 and that have their DECL_CONTEXT() == NULL. | |
3614 For each such temporary variable, set their DECL_CONTEXT() to | |
3615 the current function. This is necessary because otherwise | |
3616 some optimizers (enabled by -O2 -fprofile-arcs) might crash | |
3617 when trying to refer to a temporary variable that does not have | |
3618 it's DECL_CONTECT() properly set. */ | |
3619 static tree | |
3620 fix_temporary_vars_context_r (tree *node, | |
3621 int * /*unused*/, | |
3622 void * /*unused1*/) | |
3623 { | |
3624 gcc_assert (current_function_decl); | |
3625 | |
3626 if (TREE_CODE (*node) == BIND_EXPR) | |
3627 { | |
3628 tree var; | |
3629 | |
3630 for (var = BIND_EXPR_VARS (*node); var; var = DECL_CHAIN (var)) | |
3631 if (VAR_P (var) | |
3632 && !DECL_NAME (var) | |
3633 && DECL_ARTIFICIAL (var) | |
3634 && !DECL_CONTEXT (var)) | |
3635 DECL_CONTEXT (var) = current_function_decl; | |
3636 } | |
3637 | |
3638 return NULL_TREE; | |
3639 } | |
3640 | |
3641 /* Set up to handle the initialization or destruction of DECL. If | |
3642 INITP is nonzero, we are initializing the variable. Otherwise, we | |
3643 are destroying it. */ | |
3644 | |
3645 static void | |
3646 one_static_initialization_or_destruction (tree decl, tree init, bool initp) | |
3647 { | |
3648 tree guard_if_stmt = NULL_TREE; | |
3649 tree guard; | |
3650 | |
3651 /* If we are supposed to destruct and there's a trivial destructor, | |
3652 nothing has to be done. */ | |
3653 if (!initp | |
3654 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl))) | |
3655 return; | |
3656 | |
3657 /* Trick the compiler into thinking we are at the file and line | |
3658 where DECL was declared so that error-messages make sense, and so | |
3659 that the debugger will show somewhat sensible file and line | |
3660 information. */ | |
3661 input_location = DECL_SOURCE_LOCATION (decl); | |
3662 | |
3663 /* Make sure temporary variables in the initialiser all have | |
3664 their DECL_CONTEXT() set to a value different from NULL_TREE. | |
3665 This can happen when global variables initializers are built. | |
3666 In that case, the DECL_CONTEXT() of the global variables _AND_ of all | |
3667 the temporary variables that might have been generated in the | |
3668 accompanying initializers is NULL_TREE, meaning the variables have been | |
3669 declared in the global namespace. | |
3670 What we want to do here is to fix that and make sure the DECL_CONTEXT() | |
3671 of the temporaries are set to the current function decl. */ | |
3672 cp_walk_tree_without_duplicates (&init, | |
3673 fix_temporary_vars_context_r, | |
3674 NULL); | |
3675 | |
3676 /* Because of: | |
3677 | |
3678 [class.access.spec] | |
3679 | |
3680 Access control for implicit calls to the constructors, | |
3681 the conversion functions, or the destructor called to | |
3682 create and destroy a static data member is performed as | |
3683 if these calls appeared in the scope of the member's | |
3684 class. | |
3685 | |
3686 we pretend we are in a static member function of the class of | |
3687 which the DECL is a member. */ | |
3688 if (member_p (decl)) | |
3689 { | |
3690 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl); | |
3691 DECL_STATIC_FUNCTION_P (current_function_decl) = 1; | |
3692 } | |
3693 | |
3694 /* Assume we don't need a guard. */ | |
3695 guard = NULL_TREE; | |
3696 /* We need a guard if this is an object with external linkage that | |
3697 might be initialized in more than one place. (For example, a | |
3698 static data member of a template, when the data member requires | |
3699 construction.) */ | |
3700 if (NEEDS_GUARD_P (decl)) | |
3701 { | |
3702 tree guard_cond; | |
3703 | |
3704 guard = get_guard (decl); | |
3705 | |
3706 /* When using __cxa_atexit, we just check the GUARD as we would | |
3707 for a local static. */ | |
3708 if (flag_use_cxa_atexit) | |
3709 { | |
3710 /* When using __cxa_atexit, we never try to destroy | |
3711 anything from a static destructor. */ | |
3712 gcc_assert (initp); | |
3713 guard_cond = get_guard_cond (guard, false); | |
3714 } | |
3715 /* If we don't have __cxa_atexit, then we will be running | |
3716 destructors from .fini sections, or their equivalents. So, | |
3717 we need to know how many times we've tried to initialize this | |
3718 object. We do initializations only if the GUARD is zero, | |
3719 i.e., if we are the first to initialize the variable. We do | |
3720 destructions only if the GUARD is one, i.e., if we are the | |
3721 last to destroy the variable. */ | |
3722 else if (initp) | |
3723 guard_cond | |
3724 = cp_build_binary_op (input_location, | |
3725 EQ_EXPR, | |
3726 cp_build_unary_op (PREINCREMENT_EXPR, | |
3727 guard, | |
3728 /*noconvert=*/true, | |
3729 tf_warning_or_error), | |
3730 integer_one_node, | |
3731 tf_warning_or_error); | |
3732 else | |
3733 guard_cond | |
3734 = cp_build_binary_op (input_location, | |
3735 EQ_EXPR, | |
3736 cp_build_unary_op (PREDECREMENT_EXPR, | |
3737 guard, | |
3738 /*noconvert=*/true, | |
3739 tf_warning_or_error), | |
3740 integer_zero_node, | |
3741 tf_warning_or_error); | |
3742 | |
3743 guard_if_stmt = begin_if_stmt (); | |
3744 finish_if_stmt_cond (guard_cond, guard_if_stmt); | |
3745 } | |
3746 | |
3747 | |
3748 /* If we're using __cxa_atexit, we have not already set the GUARD, | |
3749 so we must do so now. */ | |
3750 if (guard && initp && flag_use_cxa_atexit) | |
3751 finish_expr_stmt (set_guard (guard)); | |
3752 | |
3753 /* Perform the initialization or destruction. */ | |
3754 if (initp) | |
3755 { | |
3756 if (init) | |
3757 { | |
3758 finish_expr_stmt (init); | |
3759 if (sanitize_flags_p (SANITIZE_ADDRESS, decl)) | |
3760 { | |
3761 varpool_node *vnode = varpool_node::get (decl); | |
3762 if (vnode) | |
3763 vnode->dynamically_initialized = 1; | |
3764 } | |
3765 } | |
3766 | |
3767 /* If we're using __cxa_atexit, register a function that calls the | |
3768 destructor for the object. */ | |
3769 if (flag_use_cxa_atexit) | |
3770 finish_expr_stmt (register_dtor_fn (decl)); | |
3771 } | |
3772 else | |
3773 finish_expr_stmt (build_cleanup (decl)); | |
3774 | |
3775 /* Finish the guard if-stmt, if necessary. */ | |
3776 if (guard) | |
3777 { | |
3778 finish_then_clause (guard_if_stmt); | |
3779 finish_if_stmt (guard_if_stmt); | |
3780 } | |
3781 | |
3782 /* Now that we're done with DECL we don't need to pretend to be a | |
3783 member of its class any longer. */ | |
3784 DECL_CONTEXT (current_function_decl) = NULL_TREE; | |
3785 DECL_STATIC_FUNCTION_P (current_function_decl) = 0; | |
3786 } | |
3787 | |
3788 /* Generate code to do the initialization or destruction of the decls in VARS, | |
3789 a TREE_LIST of VAR_DECL with static storage duration. | |
3790 Whether initialization or destruction is performed is specified by INITP. */ | |
3791 | |
3792 static void | |
3793 do_static_initialization_or_destruction (tree vars, bool initp) | |
3794 { | |
3795 tree node, init_if_stmt, cond; | |
3796 | |
3797 /* Build the outer if-stmt to check for initialization or destruction. */ | |
3798 init_if_stmt = begin_if_stmt (); | |
3799 cond = initp ? integer_one_node : integer_zero_node; | |
3800 cond = cp_build_binary_op (input_location, | |
3801 EQ_EXPR, | |
3802 initialize_p_decl, | |
3803 cond, | |
3804 tf_warning_or_error); | |
3805 finish_if_stmt_cond (cond, init_if_stmt); | |
3806 | |
3807 /* To make sure dynamic construction doesn't access globals from other | |
3808 compilation units where they might not be yet constructed, for | |
3809 -fsanitize=address insert __asan_before_dynamic_init call that | |
3810 prevents access to either all global variables that need construction | |
3811 in other compilation units, or at least those that haven't been | |
3812 initialized yet. Variables that need dynamic construction in | |
3813 the current compilation unit are kept accessible. */ | |
3814 if (initp && (flag_sanitize & SANITIZE_ADDRESS)) | |
3815 finish_expr_stmt (asan_dynamic_init_call (/*after_p=*/false)); | |
3816 | |
3817 node = vars; | |
3818 do { | |
3819 tree decl = TREE_VALUE (node); | |
3820 tree priority_if_stmt; | |
3821 int priority; | |
3822 priority_info pi; | |
3823 | |
3824 /* If we don't need a destructor, there's nothing to do. Avoid | |
3825 creating a possibly empty if-stmt. */ | |
3826 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl))) | |
3827 { | |
3828 node = TREE_CHAIN (node); | |
3829 continue; | |
3830 } | |
3831 | |
3832 /* Remember that we had an initialization or finalization at this | |
3833 priority. */ | |
3834 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl); | |
3835 pi = get_priority_info (priority); | |
3836 if (initp) | |
3837 pi->initializations_p = 1; | |
3838 else | |
3839 pi->destructions_p = 1; | |
3840 | |
3841 /* Conditionalize this initialization on being in the right priority | |
3842 and being initializing/finalizing appropriately. */ | |
3843 priority_if_stmt = begin_if_stmt (); | |
3844 cond = cp_build_binary_op (input_location, | |
3845 EQ_EXPR, | |
3846 priority_decl, | |
3847 build_int_cst (NULL_TREE, priority), | |
3848 tf_warning_or_error); | |
3849 finish_if_stmt_cond (cond, priority_if_stmt); | |
3850 | |
3851 /* Process initializers with same priority. */ | |
3852 for (; node | |
3853 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority; | |
3854 node = TREE_CHAIN (node)) | |
3855 /* Do one initialization or destruction. */ | |
3856 one_static_initialization_or_destruction (TREE_VALUE (node), | |
3857 TREE_PURPOSE (node), initp); | |
3858 | |
3859 /* Finish up the priority if-stmt body. */ | |
3860 finish_then_clause (priority_if_stmt); | |
3861 finish_if_stmt (priority_if_stmt); | |
3862 | |
3863 } while (node); | |
3864 | |
3865 /* Revert what __asan_before_dynamic_init did by calling | |
3866 __asan_after_dynamic_init. */ | |
3867 if (initp && (flag_sanitize & SANITIZE_ADDRESS)) | |
3868 finish_expr_stmt (asan_dynamic_init_call (/*after_p=*/true)); | |
3869 | |
3870 /* Finish up the init/destruct if-stmt body. */ | |
3871 finish_then_clause (init_if_stmt); | |
3872 finish_if_stmt (init_if_stmt); | |
3873 } | |
3874 | |
3875 /* VARS is a list of variables with static storage duration which may | |
3876 need initialization and/or finalization. Remove those variables | |
3877 that don't really need to be initialized or finalized, and return | |
3878 the resulting list. The order in which the variables appear in | |
3879 VARS is in reverse order of the order in which they should actually | |
3880 be initialized. The list we return is in the unreversed order; | |
3881 i.e., the first variable should be initialized first. */ | |
3882 | |
3883 static tree | |
3884 prune_vars_needing_no_initialization (tree *vars) | |
3885 { | |
3886 tree *var = vars; | |
3887 tree result = NULL_TREE; | |
3888 | |
3889 while (*var) | |
3890 { | |
3891 tree t = *var; | |
3892 tree decl = TREE_VALUE (t); | |
3893 tree init = TREE_PURPOSE (t); | |
3894 | |
3895 /* Deal gracefully with error. */ | |
3896 if (error_operand_p (decl)) | |
3897 { | |
3898 var = &TREE_CHAIN (t); | |
3899 continue; | |
3900 } | |
3901 | |
3902 /* The only things that can be initialized are variables. */ | |
3903 gcc_assert (VAR_P (decl)); | |
3904 | |
3905 /* If this object is not defined, we don't need to do anything | |
3906 here. */ | |
3907 if (DECL_EXTERNAL (decl)) | |
3908 { | |
3909 var = &TREE_CHAIN (t); | |
3910 continue; | |
3911 } | |
3912 | |
3913 /* Also, if the initializer already contains errors, we can bail | |
3914 out now. */ | |
3915 if (init && TREE_CODE (init) == TREE_LIST | |
3916 && value_member (error_mark_node, init)) | |
3917 { | |
3918 var = &TREE_CHAIN (t); | |
3919 continue; | |
3920 } | |
3921 | |
3922 /* This variable is going to need initialization and/or | |
3923 finalization, so we add it to the list. */ | |
3924 *var = TREE_CHAIN (t); | |
3925 TREE_CHAIN (t) = result; | |
3926 result = t; | |
3927 } | |
3928 | |
3929 return result; | |
3930 } | |
3931 | |
3932 /* Make sure we have told the back end about all the variables in | |
3933 VARS. */ | |
3934 | |
3935 static void | |
3936 write_out_vars (tree vars) | |
3937 { | |
3938 tree v; | |
3939 | |
3940 for (v = vars; v; v = TREE_CHAIN (v)) | |
3941 { | |
3942 tree var = TREE_VALUE (v); | |
3943 if (!var_finalized_p (var)) | |
3944 { | |
3945 import_export_decl (var); | |
3946 rest_of_decl_compilation (var, 1, 1); | |
3947 } | |
3948 } | |
3949 } | |
3950 | |
3951 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor | |
3952 (otherwise) that will initialize all global objects with static | |
3953 storage duration having the indicated PRIORITY. */ | |
3954 | |
3955 static void | |
3956 generate_ctor_or_dtor_function (bool constructor_p, int priority, | |
3957 location_t *locus) | |
3958 { | |
3959 char function_key; | |
3960 tree fndecl; | |
3961 tree body; | |
3962 size_t i; | |
3963 | |
3964 input_location = *locus; | |
3965 /* ??? */ | |
3966 /* Was: locus->line++; */ | |
3967 | |
3968 /* We use `I' to indicate initialization and `D' to indicate | |
3969 destruction. */ | |
3970 function_key = constructor_p ? 'I' : 'D'; | |
3971 | |
3972 /* We emit the function lazily, to avoid generating empty | |
3973 global constructors and destructors. */ | |
3974 body = NULL_TREE; | |
3975 | |
3976 /* For Objective-C++, we may need to initialize metadata found in this module. | |
3977 This must be done _before_ any other static initializations. */ | |
3978 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY) | |
3979 && constructor_p && objc_static_init_needed_p ()) | |
3980 { | |
3981 body = start_objects (function_key, priority); | |
3982 objc_generate_static_init_call (NULL_TREE); | |
3983 } | |
3984 | |
3985 /* Call the static storage duration function with appropriate | |
3986 arguments. */ | |
3987 FOR_EACH_VEC_SAFE_ELT (ssdf_decls, i, fndecl) | |
3988 { | |
3989 /* Calls to pure or const functions will expand to nothing. */ | |
3990 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE))) | |
3991 { | |
3992 tree call; | |
3993 | |
3994 if (! body) | |
3995 body = start_objects (function_key, priority); | |
3996 | |
3997 call = cp_build_function_call_nary (fndecl, tf_warning_or_error, | |
3998 build_int_cst (NULL_TREE, | |
3999 constructor_p), | |
4000 build_int_cst (NULL_TREE, | |
4001 priority), | |
4002 NULL_TREE); | |
4003 finish_expr_stmt (call); | |
4004 } | |
4005 } | |
4006 | |
4007 /* Close out the function. */ | |
4008 if (body) | |
4009 finish_objects (function_key, priority, body); | |
4010 } | |
4011 | |
4012 /* Generate constructor and destructor functions for the priority | |
4013 indicated by N. */ | |
4014 | |
4015 static int | |
4016 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data) | |
4017 { | |
4018 location_t *locus = (location_t *) data; | |
4019 int priority = (int) n->key; | |
4020 priority_info pi = (priority_info) n->value; | |
4021 | |
4022 /* Generate the functions themselves, but only if they are really | |
4023 needed. */ | |
4024 if (pi->initializations_p) | |
4025 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus); | |
4026 if (pi->destructions_p) | |
4027 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus); | |
4028 | |
4029 /* Keep iterating. */ | |
4030 return 0; | |
4031 } | |
4032 | |
4033 /* Return C++ property of T, based on given operation OP. */ | |
4034 | |
4035 static int | |
4036 cpp_check (tree t, cpp_operation op) | |
4037 { | |
4038 switch (op) | |
4039 { | |
4040 case HAS_DEPENDENT_TEMPLATE_ARGS: | |
4041 { | |
4042 tree ti = CLASSTYPE_TEMPLATE_INFO (t); | |
4043 if (!ti) | |
4044 return 0; | |
4045 ++processing_template_decl; | |
4046 const bool dep = any_dependent_template_arguments_p (TI_ARGS (ti)); | |
4047 --processing_template_decl; | |
4048 return dep; | |
4049 } | |
4050 case IS_ABSTRACT: | |
4051 return DECL_PURE_VIRTUAL_P (t); | |
4052 case IS_CONSTRUCTOR: | |
4053 return DECL_CONSTRUCTOR_P (t); | |
4054 case IS_DESTRUCTOR: | |
4055 return DECL_DESTRUCTOR_P (t); | |
4056 case IS_COPY_CONSTRUCTOR: | |
4057 return DECL_COPY_CONSTRUCTOR_P (t); | |
4058 case IS_MOVE_CONSTRUCTOR: | |
4059 return DECL_MOVE_CONSTRUCTOR_P (t); | |
4060 case IS_TEMPLATE: | |
4061 return TREE_CODE (t) == TEMPLATE_DECL; | |
4062 case IS_TRIVIAL: | |
4063 return trivial_type_p (t); | |
4064 default: | |
4065 return 0; | |
4066 } | |
4067 } | |
4068 | |
4069 /* Collect source file references recursively, starting from NAMESPC. */ | |
4070 | |
4071 static void | |
4072 collect_source_refs (tree namespc) | |
4073 { | |
4074 /* Iterate over names in this name space. */ | |
4075 for (tree t = NAMESPACE_LEVEL (namespc)->names; t; t = TREE_CHAIN (t)) | |
4076 if (DECL_IS_BUILTIN (t)) | |
4077 ; | |
4078 else if (TREE_CODE (t) == NAMESPACE_DECL && !DECL_NAMESPACE_ALIAS (t)) | |
4079 collect_source_refs (t); | |
4080 else | |
4081 collect_source_ref (DECL_SOURCE_FILE (t)); | |
4082 } | |
4083 | |
4084 /* Collect decls relevant to SOURCE_FILE from all namespaces recursively, | |
4085 starting from NAMESPC. */ | |
4086 | |
4087 static void | |
4088 collect_ada_namespace (tree namespc, const char *source_file) | |
4089 { | |
4090 tree decl = NAMESPACE_LEVEL (namespc)->names; | |
4091 | |
4092 /* Collect decls from this namespace. This will skip | |
4093 NAMESPACE_DECLs (both aliases and regular, it cannot tell). */ | |
4094 collect_ada_nodes (decl, source_file); | |
4095 | |
4096 /* Now scan for namespace children, and dump them. */ | |
4097 for (; decl; decl = TREE_CHAIN (decl)) | |
4098 if (TREE_CODE (decl) == NAMESPACE_DECL && !DECL_NAMESPACE_ALIAS (decl)) | |
4099 collect_ada_namespace (decl, source_file); | |
4100 } | |
4101 | |
4102 /* Returns true iff there is a definition available for variable or | |
4103 function DECL. */ | |
4104 | |
4105 bool | |
4106 decl_defined_p (tree decl) | |
4107 { | |
4108 if (TREE_CODE (decl) == FUNCTION_DECL) | |
4109 return (DECL_INITIAL (decl) != NULL_TREE | |
4110 /* A pending instantiation of a friend temploid is defined. */ | |
4111 || (DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl) | |
4112 && DECL_INITIAL (DECL_TEMPLATE_RESULT | |
4113 (DECL_TI_TEMPLATE (decl))))); | |
4114 else | |
4115 { | |
4116 gcc_assert (VAR_P (decl)); | |
4117 return !DECL_EXTERNAL (decl); | |
4118 } | |
4119 } | |
4120 | |
4121 /* Nonzero for a VAR_DECL whose value can be used in a constant expression. | |
4122 | |
4123 [expr.const] | |
4124 | |
4125 An integral constant-expression can only involve ... const | |
4126 variables of integral or enumeration types initialized with | |
4127 constant expressions ... | |
4128 | |
4129 C++0x also allows constexpr variables and temporaries initialized | |
4130 with constant expressions. We handle the former here, but the latter | |
4131 are just folded away in cxx_eval_constant_expression. | |
4132 | |
4133 The standard does not require that the expression be non-volatile. | |
4134 G++ implements the proposed correction in DR 457. */ | |
4135 | |
4136 bool | |
4137 decl_constant_var_p (tree decl) | |
4138 { | |
4139 if (!decl_maybe_constant_var_p (decl)) | |
4140 return false; | |
4141 | |
4142 /* We don't know if a template static data member is initialized with | |
4143 a constant expression until we instantiate its initializer. Even | |
4144 in the case of a constexpr variable, we can't treat it as a | |
4145 constant until its initializer is complete in case it's used in | |
4146 its own initializer. */ | |
4147 maybe_instantiate_decl (decl); | |
4148 return DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl); | |
4149 } | |
4150 | |
4151 /* Returns true if DECL could be a symbolic constant variable, depending on | |
4152 its initializer. */ | |
4153 | |
4154 bool | |
4155 decl_maybe_constant_var_p (tree decl) | |
4156 { | |
4157 tree type = TREE_TYPE (decl); | |
4158 if (!VAR_P (decl)) | |
4159 return false; | |
4160 if (DECL_DECLARED_CONSTEXPR_P (decl)) | |
4161 return true; | |
4162 if (DECL_HAS_VALUE_EXPR_P (decl)) | |
4163 /* A proxy isn't constant. */ | |
4164 return false; | |
4165 if (TREE_CODE (type) == REFERENCE_TYPE) | |
4166 /* References can be constant. */; | |
4167 else if (CP_TYPE_CONST_NON_VOLATILE_P (type) | |
4168 && INTEGRAL_OR_ENUMERATION_TYPE_P (type)) | |
4169 /* And const integers. */; | |
4170 else | |
4171 return false; | |
4172 | |
4173 if (DECL_INITIAL (decl) | |
4174 && !DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)) | |
4175 /* We know the initializer, and it isn't constant. */ | |
4176 return false; | |
4177 else | |
4178 return true; | |
4179 } | |
4180 | |
4181 /* Complain that DECL uses a type with no linkage. In C++98 mode this is | |
4182 called from grokfndecl and grokvardecl; in all modes it is called from | |
4183 cp_write_global_declarations. */ | |
4184 | |
4185 void | |
4186 no_linkage_error (tree decl) | |
4187 { | |
4188 if (cxx_dialect >= cxx11 && decl_defined_p (decl)) | |
4189 /* In C++11 it's ok if the decl is defined. */ | |
4190 return; | |
4191 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false); | |
4192 if (t == NULL_TREE) | |
4193 /* The type that got us on no_linkage_decls must have gotten a name for | |
4194 linkage purposes. */; | |
4195 else if (CLASS_TYPE_P (t) && TYPE_BEING_DEFINED (t)) | |
4196 /* The type might end up having a typedef name for linkage purposes. */ | |
4197 vec_safe_push (no_linkage_decls, decl); | |
4198 else if (TYPE_UNNAMED_P (t)) | |
4199 { | |
4200 bool d = false; | |
4201 if (cxx_dialect >= cxx11) | |
4202 d = permerror (DECL_SOURCE_LOCATION (decl), "%q#D, declared using " | |
4203 "unnamed type, is used but never defined", decl); | |
4204 else if (DECL_EXTERN_C_P (decl)) | |
4205 /* Allow this; it's pretty common in C. */; | |
4206 else if (VAR_P (decl)) | |
4207 /* DRs 132, 319 and 389 seem to indicate types with | |
4208 no linkage can only be used to declare extern "C" | |
4209 entities. Since it's not always an error in the | |
4210 ISO C++ 90 Standard, we only issue a warning. */ | |
4211 d = warning_at (DECL_SOURCE_LOCATION (decl), 0, "unnamed type " | |
4212 "with no linkage used to declare variable %q#D with " | |
4213 "linkage", decl); | |
4214 else | |
4215 d = permerror (DECL_SOURCE_LOCATION (decl), "unnamed type with no " | |
4216 "linkage used to declare function %q#D with linkage", | |
4217 decl); | |
4218 if (d && is_typedef_decl (TYPE_NAME (t))) | |
4219 inform (DECL_SOURCE_LOCATION (TYPE_NAME (t)), "%q#D does not refer " | |
4220 "to the unqualified type, so it is not used for linkage", | |
4221 TYPE_NAME (t)); | |
4222 } | |
4223 else if (cxx_dialect >= cxx11) | |
4224 { | |
4225 if (VAR_P (decl) || !DECL_PURE_VIRTUAL_P (decl)) | |
4226 permerror (DECL_SOURCE_LOCATION (decl), | |
4227 "%q#D, declared using local type " | |
4228 "%qT, is used but never defined", decl, t); | |
4229 } | |
4230 else if (VAR_P (decl)) | |
4231 warning_at (DECL_SOURCE_LOCATION (decl), 0, "type %qT with no linkage " | |
4232 "used to declare variable %q#D with linkage", t, decl); | |
4233 else | |
4234 permerror (DECL_SOURCE_LOCATION (decl), "type %qT with no linkage used " | |
4235 "to declare function %q#D with linkage", t, decl); | |
4236 } | |
4237 | |
4238 /* Collect declarations from all namespaces relevant to SOURCE_FILE. */ | |
4239 | |
4240 static void | |
4241 collect_all_refs (const char *source_file) | |
4242 { | |
4243 collect_ada_namespace (global_namespace, source_file); | |
4244 } | |
4245 | |
4246 /* Clear DECL_EXTERNAL for NODE. */ | |
4247 | |
4248 static bool | |
4249 clear_decl_external (struct cgraph_node *node, void * /*data*/) | |
4250 { | |
4251 DECL_EXTERNAL (node->decl) = 0; | |
4252 return false; | |
4253 } | |
4254 | |
4255 /* Build up the function to run dynamic initializers for thread_local | |
4256 variables in this translation unit and alias the init functions for the | |
4257 individual variables to it. */ | |
4258 | |
4259 static void | |
4260 handle_tls_init (void) | |
4261 { | |
4262 tree vars = prune_vars_needing_no_initialization (&tls_aggregates); | |
4263 if (vars == NULL_TREE) | |
4264 return; | |
4265 | |
4266 location_t loc = DECL_SOURCE_LOCATION (TREE_VALUE (vars)); | |
4267 | |
4268 write_out_vars (vars); | |
4269 | |
4270 tree guard = build_decl (loc, VAR_DECL, get_identifier ("__tls_guard"), | |
4271 boolean_type_node); | |
4272 TREE_PUBLIC (guard) = false; | |
4273 TREE_STATIC (guard) = true; | |
4274 DECL_ARTIFICIAL (guard) = true; | |
4275 DECL_IGNORED_P (guard) = true; | |
4276 TREE_USED (guard) = true; | |
4277 CP_DECL_THREAD_LOCAL_P (guard) = true; | |
4278 set_decl_tls_model (guard, decl_default_tls_model (guard)); | |
4279 pushdecl_top_level_and_finish (guard, NULL_TREE); | |
4280 | |
4281 tree fn = get_local_tls_init_fn (); | |
4282 start_preparsed_function (fn, NULL_TREE, SF_PRE_PARSED); | |
4283 tree body = begin_function_body (); | |
4284 tree if_stmt = begin_if_stmt (); | |
4285 tree cond = cp_build_unary_op (TRUTH_NOT_EXPR, guard, false, | |
4286 tf_warning_or_error); | |
4287 finish_if_stmt_cond (cond, if_stmt); | |
4288 finish_expr_stmt (cp_build_modify_expr (loc, guard, NOP_EXPR, | |
4289 boolean_true_node, | |
4290 tf_warning_or_error)); | |
4291 for (; vars; vars = TREE_CHAIN (vars)) | |
4292 { | |
4293 tree var = TREE_VALUE (vars); | |
4294 tree init = TREE_PURPOSE (vars); | |
4295 one_static_initialization_or_destruction (var, init, true); | |
4296 | |
4297 /* Output init aliases even with -fno-extern-tls-init. */ | |
4298 if (TARGET_SUPPORTS_ALIASES && TREE_PUBLIC (var)) | |
4299 { | |
4300 tree single_init_fn = get_tls_init_fn (var); | |
4301 if (single_init_fn == NULL_TREE) | |
4302 continue; | |
4303 cgraph_node *alias | |
4304 = cgraph_node::get_create (fn)->create_same_body_alias | |
4305 (single_init_fn, fn); | |
4306 gcc_assert (alias != NULL); | |
4307 } | |
4308 } | |
4309 | |
4310 finish_then_clause (if_stmt); | |
4311 finish_if_stmt (if_stmt); | |
4312 finish_function_body (body); | |
4313 expand_or_defer_fn (finish_function (/*inline_p=*/false)); | |
4314 } | |
4315 | |
4316 /* We're at the end of compilation, so generate any mangling aliases that | |
4317 we've been saving up, if DECL is going to be output and ID2 isn't | |
4318 already taken by another declaration. */ | |
4319 | |
4320 static void | |
4321 generate_mangling_alias (tree decl, tree id2) | |
4322 { | |
4323 struct cgraph_node *n = NULL; | |
4324 | |
4325 if (TREE_CODE (decl) == FUNCTION_DECL) | |
4326 { | |
4327 n = cgraph_node::get (decl); | |
4328 if (!n) | |
4329 /* Don't create an alias to an unreferenced function. */ | |
4330 return; | |
4331 } | |
4332 | |
4333 tree *slot | |
4334 = mangled_decls->find_slot_with_hash (id2, IDENTIFIER_HASH_VALUE (id2), | |
4335 INSERT); | |
4336 | |
4337 /* If there's a declaration already using this mangled name, | |
4338 don't create a compatibility alias that conflicts. */ | |
4339 if (*slot) | |
4340 return; | |
4341 | |
4342 tree alias = make_alias_for (decl, id2); | |
4343 *slot = alias; | |
4344 | |
4345 DECL_IGNORED_P (alias) = 1; | |
4346 TREE_PUBLIC (alias) = TREE_PUBLIC (decl); | |
4347 DECL_VISIBILITY (alias) = DECL_VISIBILITY (decl); | |
4348 if (vague_linkage_p (decl)) | |
4349 DECL_WEAK (alias) = 1; | |
4350 | |
4351 if (n) | |
4352 n->create_same_body_alias (alias, decl); | |
4353 else | |
4354 varpool_node::create_extra_name_alias (alias, decl); | |
4355 } | |
4356 | |
4357 /* Note that we might want to emit an alias with the symbol ID2 for DECL at | |
4358 the end of translation, for compatibility across bugs in the mangling | |
4359 implementation. */ | |
4360 | |
4361 void | |
4362 note_mangling_alias (tree decl, tree id2) | |
4363 { | |
4364 if (TARGET_SUPPORTS_ALIASES) | |
4365 { | |
4366 if (!defer_mangling_aliases) | |
4367 generate_mangling_alias (decl, id2); | |
4368 else | |
4369 { | |
4370 vec_safe_push (mangling_aliases, decl); | |
4371 vec_safe_push (mangling_aliases, id2); | |
4372 } | |
4373 } | |
4374 } | |
4375 | |
4376 /* Emit all mangling aliases that were deferred up to this point. */ | |
4377 | |
4378 void | |
4379 generate_mangling_aliases () | |
4380 { | |
4381 while (!vec_safe_is_empty (mangling_aliases)) | |
4382 { | |
4383 tree id2 = mangling_aliases->pop(); | |
4384 tree decl = mangling_aliases->pop(); | |
4385 generate_mangling_alias (decl, id2); | |
4386 } | |
4387 defer_mangling_aliases = false; | |
4388 } | |
4389 | |
4390 /* Record a mangling of DECL, whose DECL_ASSEMBLER_NAME has just been | |
4391 set. NEED_WARNING is true if we must warn about collisions. We do | |
4392 this to spot changes in mangling that may require compatibility | |
4393 aliases. */ | |
4394 | |
4395 void | |
4396 record_mangling (tree decl, bool need_warning) | |
4397 { | |
4398 if (!mangled_decls) | |
4399 mangled_decls = hash_table<mangled_decl_hash>::create_ggc (499); | |
4400 | |
4401 gcc_checking_assert (DECL_ASSEMBLER_NAME_SET_P (decl)); | |
4402 tree id = DECL_ASSEMBLER_NAME_RAW (decl); | |
4403 tree *slot | |
4404 = mangled_decls->find_slot_with_hash (id, IDENTIFIER_HASH_VALUE (id), | |
4405 INSERT); | |
4406 | |
4407 /* If this is already an alias, remove the alias, because the real | |
4408 decl takes precedence. */ | |
4409 if (*slot && DECL_ARTIFICIAL (*slot) && DECL_IGNORED_P (*slot)) | |
4410 if (symtab_node *n = symtab_node::get (*slot)) | |
4411 if (n->cpp_implicit_alias) | |
4412 { | |
4413 n->remove (); | |
4414 *slot = NULL_TREE; | |
4415 } | |
4416 | |
4417 if (!*slot) | |
4418 *slot = decl; | |
4419 else if (need_warning) | |
4420 { | |
4421 error_at (DECL_SOURCE_LOCATION (decl), | |
4422 "mangling of %q#D as %qE conflicts with a previous mangle", | |
4423 decl, id); | |
4424 inform (DECL_SOURCE_LOCATION (*slot), | |
4425 "previous mangling %q#D", *slot); | |
4426 inform (DECL_SOURCE_LOCATION (decl), | |
4427 "a later -fabi-version= (or =0)" | |
4428 " avoids this error with a change in mangling"); | |
4429 *slot = decl; | |
4430 } | |
4431 } | |
4432 | |
4433 /* The entire file is now complete. If requested, dump everything | |
4434 to a file. */ | |
4435 | |
4436 static void | |
4437 dump_tu (void) | |
4438 { | |
4439 dump_flags_t flags; | |
4440 if (FILE *stream = dump_begin (raw_dump_id, &flags)) | |
4441 { | |
4442 dump_node (global_namespace, flags & ~TDF_SLIM, stream); | |
4443 dump_end (raw_dump_id, stream); | |
4444 } | |
4445 } | |
4446 | |
4447 static location_t locus_at_end_of_parsing; | |
4448 | |
4449 /* Check the deallocation functions for CODE to see if we want to warn that | |
4450 only one was defined. */ | |
4451 | |
4452 static void | |
4453 maybe_warn_sized_delete (enum tree_code code) | |
4454 { | |
4455 tree sized = NULL_TREE; | |
4456 tree unsized = NULL_TREE; | |
4457 | |
4458 for (ovl_iterator iter (get_global_binding (cp_operator_id (code))); | |
4459 iter; ++iter) | |
4460 { | |
4461 tree fn = *iter; | |
4462 /* We're only interested in usual deallocation functions. */ | |
4463 if (!usual_deallocation_fn_p (fn)) | |
4464 continue; | |
4465 if (FUNCTION_ARG_CHAIN (fn) == void_list_node) | |
4466 unsized = fn; | |
4467 else | |
4468 sized = fn; | |
4469 } | |
4470 if (DECL_INITIAL (unsized) && !DECL_INITIAL (sized)) | |
4471 warning_at (DECL_SOURCE_LOCATION (unsized), OPT_Wsized_deallocation, | |
4472 "the program should also define %qD", sized); | |
4473 else if (!DECL_INITIAL (unsized) && DECL_INITIAL (sized)) | |
4474 warning_at (DECL_SOURCE_LOCATION (sized), OPT_Wsized_deallocation, | |
4475 "the program should also define %qD", unsized); | |
4476 } | |
4477 | |
4478 /* Check the global deallocation functions to see if we want to warn about | |
4479 defining unsized without sized (or vice versa). */ | |
4480 | |
4481 static void | |
4482 maybe_warn_sized_delete () | |
4483 { | |
4484 if (!flag_sized_deallocation || !warn_sized_deallocation) | |
4485 return; | |
4486 maybe_warn_sized_delete (DELETE_EXPR); | |
4487 maybe_warn_sized_delete (VEC_DELETE_EXPR); | |
4488 } | |
4489 | |
4490 /* Earlier we left PTRMEM_CST in variable initializers alone so that we could | |
4491 look them up when evaluating non-type template parameters. Now we need to | |
4492 lower them to something the back end can understand. */ | |
4493 | |
4494 static void | |
4495 lower_var_init () | |
4496 { | |
4497 varpool_node *node; | |
4498 FOR_EACH_VARIABLE (node) | |
4499 { | |
4500 tree d = node->decl; | |
4501 if (tree init = DECL_INITIAL (d)) | |
4502 DECL_INITIAL (d) = cplus_expand_constant (init); | |
4503 } | |
4504 } | |
4505 | |
4506 /* This routine is called at the end of compilation. | |
4507 Its job is to create all the code needed to initialize and | |
4508 destroy the global aggregates. We do the destruction | |
4509 first, since that way we only need to reverse the decls once. */ | |
4510 | |
4511 void | |
4512 c_parse_final_cleanups (void) | |
4513 { | |
4514 tree vars; | |
4515 bool reconsider; | |
4516 size_t i; | |
4517 unsigned ssdf_count = 0; | |
4518 int retries = 0; | |
4519 tree decl; | |
4520 | |
4521 locus_at_end_of_parsing = input_location; | |
4522 at_eof = 1; | |
4523 | |
4524 /* Bad parse errors. Just forget about it. */ | |
4525 if (! global_bindings_p () || current_class_type | |
4526 || !vec_safe_is_empty (decl_namespace_list)) | |
4527 return; | |
4528 | |
4529 /* This is the point to write out a PCH if we're doing that. | |
4530 In that case we do not want to do anything else. */ | |
4531 if (pch_file) | |
4532 { | |
4533 /* Mangle all symbols at PCH creation time. */ | |
4534 symtab_node *node; | |
4535 FOR_EACH_SYMBOL (node) | |
4536 if (! is_a <varpool_node *> (node) | |
4537 || ! DECL_HARD_REGISTER (node->decl)) | |
4538 DECL_ASSEMBLER_NAME (node->decl); | |
4539 c_common_write_pch (); | |
4540 dump_tu (); | |
4541 /* Ensure even the callers don't try to finalize the CU. */ | |
4542 flag_syntax_only = 1; | |
4543 return; | |
4544 } | |
4545 | |
4546 timevar_stop (TV_PHASE_PARSING); | |
4547 timevar_start (TV_PHASE_DEFERRED); | |
4548 | |
4549 symtab->process_same_body_aliases (); | |
4550 | |
4551 /* Handle -fdump-ada-spec[-slim] */ | |
4552 if (flag_dump_ada_spec || flag_dump_ada_spec_slim) | |
4553 { | |
4554 if (flag_dump_ada_spec_slim) | |
4555 collect_source_ref (main_input_filename); | |
4556 else | |
4557 collect_source_refs (global_namespace); | |
4558 | |
4559 dump_ada_specs (collect_all_refs, cpp_check); | |
4560 } | |
4561 | |
4562 /* FIXME - huh? was input_line -= 1;*/ | |
4563 | |
4564 /* We now have to write out all the stuff we put off writing out. | |
4565 These include: | |
4566 | |
4567 o Template specializations that we have not yet instantiated, | |
4568 but which are needed. | |
4569 o Initialization and destruction for non-local objects with | |
4570 static storage duration. (Local objects with static storage | |
4571 duration are initialized when their scope is first entered, | |
4572 and are cleaned up via atexit.) | |
4573 o Virtual function tables. | |
4574 | |
4575 All of these may cause others to be needed. For example, | |
4576 instantiating one function may cause another to be needed, and | |
4577 generating the initializer for an object may cause templates to be | |
4578 instantiated, etc., etc. */ | |
4579 | |
4580 emit_support_tinfos (); | |
4581 | |
4582 do | |
4583 { | |
4584 tree t; | |
4585 tree decl; | |
4586 | |
4587 reconsider = false; | |
4588 | |
4589 /* If there are templates that we've put off instantiating, do | |
4590 them now. */ | |
4591 instantiate_pending_templates (retries); | |
4592 ggc_collect (); | |
4593 | |
4594 /* Write out virtual tables as required. Writing out the | |
4595 virtual table for a template class may cause the | |
4596 instantiation of members of that class. If we write out | |
4597 vtables then we remove the class from our list so we don't | |
4598 have to look at it again. */ | |
4599 for (i = keyed_classes->length (); | |
4600 keyed_classes->iterate (--i, &t);) | |
4601 if (maybe_emit_vtables (t)) | |
4602 { | |
4603 reconsider = true; | |
4604 keyed_classes->unordered_remove (i); | |
4605 } | |
4606 | |
4607 /* Write out needed type info variables. We have to be careful | |
4608 looping through unemitted decls, because emit_tinfo_decl may | |
4609 cause other variables to be needed. New elements will be | |
4610 appended, and we remove from the vector those that actually | |
4611 get emitted. */ | |
4612 for (i = unemitted_tinfo_decls->length (); | |
4613 unemitted_tinfo_decls->iterate (--i, &t);) | |
4614 if (emit_tinfo_decl (t)) | |
4615 { | |
4616 reconsider = true; | |
4617 unemitted_tinfo_decls->unordered_remove (i); | |
4618 } | |
4619 | |
4620 /* The list of objects with static storage duration is built up | |
4621 in reverse order. We clear STATIC_AGGREGATES so that any new | |
4622 aggregates added during the initialization of these will be | |
4623 initialized in the correct order when we next come around the | |
4624 loop. */ | |
4625 vars = prune_vars_needing_no_initialization (&static_aggregates); | |
4626 | |
4627 if (vars) | |
4628 { | |
4629 /* We need to start a new initialization function each time | |
4630 through the loop. That's because we need to know which | |
4631 vtables have been referenced, and TREE_SYMBOL_REFERENCED | |
4632 isn't computed until a function is finished, and written | |
4633 out. That's a deficiency in the back end. When this is | |
4634 fixed, these initialization functions could all become | |
4635 inline, with resulting performance improvements. */ | |
4636 tree ssdf_body; | |
4637 | |
4638 /* Set the line and file, so that it is obviously not from | |
4639 the source file. */ | |
4640 input_location = locus_at_end_of_parsing; | |
4641 ssdf_body = start_static_storage_duration_function (ssdf_count); | |
4642 | |
4643 /* Make sure the back end knows about all the variables. */ | |
4644 write_out_vars (vars); | |
4645 | |
4646 /* First generate code to do all the initializations. */ | |
4647 if (vars) | |
4648 do_static_initialization_or_destruction (vars, /*initp=*/true); | |
4649 | |
4650 /* Then, generate code to do all the destructions. Do these | |
4651 in reverse order so that the most recently constructed | |
4652 variable is the first destroyed. If we're using | |
4653 __cxa_atexit, then we don't need to do this; functions | |
4654 were registered at initialization time to destroy the | |
4655 local statics. */ | |
4656 if (!flag_use_cxa_atexit && vars) | |
4657 { | |
4658 vars = nreverse (vars); | |
4659 do_static_initialization_or_destruction (vars, /*initp=*/false); | |
4660 } | |
4661 else | |
4662 vars = NULL_TREE; | |
4663 | |
4664 /* Finish up the static storage duration function for this | |
4665 round. */ | |
4666 input_location = locus_at_end_of_parsing; | |
4667 finish_static_storage_duration_function (ssdf_body); | |
4668 | |
4669 /* All those initializations and finalizations might cause | |
4670 us to need more inline functions, more template | |
4671 instantiations, etc. */ | |
4672 reconsider = true; | |
4673 ssdf_count++; | |
4674 /* ??? was: locus_at_end_of_parsing.line++; */ | |
4675 } | |
4676 | |
4677 /* Now do the same for thread_local variables. */ | |
4678 handle_tls_init (); | |
4679 | |
4680 /* Go through the set of inline functions whose bodies have not | |
4681 been emitted yet. If out-of-line copies of these functions | |
4682 are required, emit them. */ | |
4683 FOR_EACH_VEC_SAFE_ELT (deferred_fns, i, decl) | |
4684 { | |
4685 /* Does it need synthesizing? */ | |
4686 if (DECL_DEFAULTED_FN (decl) && ! DECL_INITIAL (decl) | |
4687 && (! DECL_REALLY_EXTERN (decl) || possibly_inlined_p (decl))) | |
4688 { | |
4689 /* Even though we're already at the top-level, we push | |
4690 there again. That way, when we pop back a few lines | |
4691 hence, all of our state is restored. Otherwise, | |
4692 finish_function doesn't clean things up, and we end | |
4693 up with CURRENT_FUNCTION_DECL set. */ | |
4694 push_to_top_level (); | |
4695 /* The decl's location will mark where it was first | |
4696 needed. Save that so synthesize method can indicate | |
4697 where it was needed from, in case of error */ | |
4698 input_location = DECL_SOURCE_LOCATION (decl); | |
4699 synthesize_method (decl); | |
4700 pop_from_top_level (); | |
4701 reconsider = true; | |
4702 } | |
4703 | |
4704 if (!DECL_INITIAL (decl) && decl_tls_wrapper_p (decl)) | |
4705 generate_tls_wrapper (decl); | |
4706 | |
4707 if (!DECL_SAVED_TREE (decl)) | |
4708 continue; | |
4709 | |
4710 cgraph_node *node = cgraph_node::get_create (decl); | |
4711 | |
4712 /* We lie to the back end, pretending that some functions | |
4713 are not defined when they really are. This keeps these | |
4714 functions from being put out unnecessarily. But, we must | |
4715 stop lying when the functions are referenced, or if they | |
4716 are not comdat since they need to be put out now. If | |
4717 DECL_INTERFACE_KNOWN, then we have already set | |
4718 DECL_EXTERNAL appropriately, so there's no need to check | |
4719 again, and we do not want to clear DECL_EXTERNAL if a | |
4720 previous call to import_export_decl set it. | |
4721 | |
4722 This is done in a separate for cycle, because if some | |
4723 deferred function is contained in another deferred | |
4724 function later in deferred_fns varray, | |
4725 rest_of_compilation would skip this function and we | |
4726 really cannot expand the same function twice. */ | |
4727 import_export_decl (decl); | |
4728 if (DECL_NOT_REALLY_EXTERN (decl) | |
4729 && DECL_INITIAL (decl) | |
4730 && decl_needed_p (decl)) | |
4731 { | |
4732 if (node->cpp_implicit_alias) | |
4733 node = node->get_alias_target (); | |
4734 | |
4735 node->call_for_symbol_thunks_and_aliases (clear_decl_external, | |
4736 NULL, true); | |
4737 /* If we mark !DECL_EXTERNAL one of the symbols in some comdat | |
4738 group, we need to mark all symbols in the same comdat group | |
4739 that way. */ | |
4740 if (node->same_comdat_group) | |
4741 for (cgraph_node *next | |
4742 = dyn_cast<cgraph_node *> (node->same_comdat_group); | |
4743 next != node; | |
4744 next = dyn_cast<cgraph_node *> (next->same_comdat_group)) | |
4745 next->call_for_symbol_thunks_and_aliases (clear_decl_external, | |
4746 NULL, true); | |
4747 } | |
4748 | |
4749 /* If we're going to need to write this function out, and | |
4750 there's already a body for it, create RTL for it now. | |
4751 (There might be no body if this is a method we haven't | |
4752 gotten around to synthesizing yet.) */ | |
4753 if (!DECL_EXTERNAL (decl) | |
4754 && decl_needed_p (decl) | |
4755 && !TREE_ASM_WRITTEN (decl) | |
4756 && !node->definition) | |
4757 { | |
4758 /* We will output the function; no longer consider it in this | |
4759 loop. */ | |
4760 DECL_DEFER_OUTPUT (decl) = 0; | |
4761 /* Generate RTL for this function now that we know we | |
4762 need it. */ | |
4763 expand_or_defer_fn (decl); | |
4764 /* If we're compiling -fsyntax-only pretend that this | |
4765 function has been written out so that we don't try to | |
4766 expand it again. */ | |
4767 if (flag_syntax_only) | |
4768 TREE_ASM_WRITTEN (decl) = 1; | |
4769 reconsider = true; | |
4770 } | |
4771 } | |
4772 | |
4773 if (wrapup_namespace_globals ()) | |
4774 reconsider = true; | |
4775 | |
4776 /* Static data members are just like namespace-scope globals. */ | |
4777 FOR_EACH_VEC_SAFE_ELT (pending_statics, i, decl) | |
4778 { | |
4779 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl) | |
4780 /* Don't write it out if we haven't seen a definition. */ | |
4781 || (DECL_IN_AGGR_P (decl) && !DECL_INLINE_VAR_P (decl))) | |
4782 continue; | |
4783 import_export_decl (decl); | |
4784 /* If this static data member is needed, provide it to the | |
4785 back end. */ | |
4786 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl)) | |
4787 DECL_EXTERNAL (decl) = 0; | |
4788 } | |
4789 if (vec_safe_length (pending_statics) != 0 | |
4790 && wrapup_global_declarations (pending_statics->address (), | |
4791 pending_statics->length ())) | |
4792 reconsider = true; | |
4793 | |
4794 retries++; | |
4795 } | |
4796 while (reconsider); | |
4797 | |
4798 lower_var_init (); | |
4799 | |
4800 generate_mangling_aliases (); | |
4801 | |
4802 /* All used inline functions must have a definition at this point. */ | |
4803 FOR_EACH_VEC_SAFE_ELT (deferred_fns, i, decl) | |
4804 { | |
4805 if (/* Check online inline functions that were actually used. */ | |
4806 DECL_ODR_USED (decl) && DECL_DECLARED_INLINE_P (decl) | |
4807 /* If the definition actually was available here, then the | |
4808 fact that the function was not defined merely represents | |
4809 that for some reason (use of a template repository, | |
4810 #pragma interface, etc.) we decided not to emit the | |
4811 definition here. */ | |
4812 && !DECL_INITIAL (decl) | |
4813 /* Don't complain if the template was defined. */ | |
4814 && !(DECL_TEMPLATE_INSTANTIATION (decl) | |
4815 && DECL_INITIAL (DECL_TEMPLATE_RESULT | |
4816 (template_for_substitution (decl))))) | |
4817 { | |
4818 warning_at (DECL_SOURCE_LOCATION (decl), 0, | |
4819 "inline function %qD used but never defined", decl); | |
4820 /* Avoid a duplicate warning from check_global_declaration. */ | |
4821 TREE_NO_WARNING (decl) = 1; | |
4822 } | |
4823 } | |
4824 | |
4825 /* So must decls that use a type with no linkage. */ | |
4826 FOR_EACH_VEC_SAFE_ELT (no_linkage_decls, i, decl) | |
4827 no_linkage_error (decl); | |
4828 | |
4829 maybe_warn_sized_delete (); | |
4830 | |
4831 /* Then, do the Objective-C stuff. This is where all the | |
4832 Objective-C module stuff gets generated (symtab, | |
4833 class/protocol/selector lists etc). This must be done after C++ | |
4834 templates, destructors etc. so that selectors used in C++ | |
4835 templates are properly allocated. */ | |
4836 if (c_dialect_objc ()) | |
4837 objc_write_global_declarations (); | |
4838 | |
4839 /* We give C linkage to static constructors and destructors. */ | |
4840 push_lang_context (lang_name_c); | |
4841 | |
4842 /* Generate initialization and destruction functions for all | |
4843 priorities for which they are required. */ | |
4844 if (priority_info_map) | |
4845 splay_tree_foreach (priority_info_map, | |
4846 generate_ctor_and_dtor_functions_for_priority, | |
4847 /*data=*/&locus_at_end_of_parsing); | |
4848 else if (c_dialect_objc () && objc_static_init_needed_p ()) | |
4849 /* If this is obj-c++ and we need a static init, call | |
4850 generate_ctor_or_dtor_function. */ | |
4851 generate_ctor_or_dtor_function (/*constructor_p=*/true, | |
4852 DEFAULT_INIT_PRIORITY, | |
4853 &locus_at_end_of_parsing); | |
4854 | |
4855 /* We're done with the splay-tree now. */ | |
4856 if (priority_info_map) | |
4857 splay_tree_delete (priority_info_map); | |
4858 | |
4859 /* Generate any missing aliases. */ | |
4860 maybe_apply_pending_pragma_weaks (); | |
4861 | |
4862 /* We're done with static constructors, so we can go back to "C++" | |
4863 linkage now. */ | |
4864 pop_lang_context (); | |
4865 | |
4866 if (flag_vtable_verify) | |
4867 { | |
4868 vtv_recover_class_info (); | |
4869 vtv_compute_class_hierarchy_transitive_closure (); | |
4870 vtv_build_vtable_verify_fndecl (); | |
4871 } | |
4872 | |
4873 perform_deferred_noexcept_checks (); | |
4874 | |
4875 finish_repo (); | |
4876 fini_constexpr (); | |
4877 | |
4878 /* The entire file is now complete. If requested, dump everything | |
4879 to a file. */ | |
4880 dump_tu (); | |
4881 | |
4882 if (flag_detailed_statistics) | |
4883 { | |
4884 dump_tree_statistics (); | |
4885 dump_time_statistics (); | |
4886 } | |
4887 | |
4888 timevar_stop (TV_PHASE_DEFERRED); | |
4889 timevar_start (TV_PHASE_PARSING); | |
4890 | |
4891 /* Indicate that we're done with front end processing. */ | |
4892 at_eof = 2; | |
4893 } | |
4894 | |
4895 /* Perform any post compilation-proper cleanups for the C++ front-end. | |
4896 This should really go away. No front-end should need to do | |
4897 anything past the compilation process. */ | |
4898 | |
4899 void | |
4900 cxx_post_compilation_parsing_cleanups (void) | |
4901 { | |
4902 timevar_start (TV_PHASE_LATE_PARSING_CLEANUPS); | |
4903 | |
4904 if (flag_vtable_verify) | |
4905 { | |
4906 /* Generate the special constructor initialization function that | |
4907 calls __VLTRegisterPairs, and give it a very high | |
4908 initialization priority. This must be done after | |
4909 finalize_compilation_unit so that we have accurate | |
4910 information about which vtable will actually be emitted. */ | |
4911 vtv_generate_init_routine (); | |
4912 } | |
4913 | |
4914 input_location = locus_at_end_of_parsing; | |
4915 | |
4916 if (flag_checking) | |
4917 validate_conversion_obstack (); | |
4918 | |
4919 timevar_stop (TV_PHASE_LATE_PARSING_CLEANUPS); | |
4920 } | |
4921 | |
4922 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the | |
4923 function to call in parse-tree form; it has not yet been | |
4924 semantically analyzed. ARGS are the arguments to the function. | |
4925 They have already been semantically analyzed. This may change | |
4926 ARGS. */ | |
4927 | |
4928 tree | |
4929 build_offset_ref_call_from_tree (tree fn, vec<tree, va_gc> **args, | |
4930 tsubst_flags_t complain) | |
4931 { | |
4932 tree orig_fn; | |
4933 vec<tree, va_gc> *orig_args = NULL; | |
4934 tree expr; | |
4935 tree object; | |
4936 | |
4937 orig_fn = fn; | |
4938 object = TREE_OPERAND (fn, 0); | |
4939 | |
4940 if (processing_template_decl) | |
4941 { | |
4942 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR | |
4943 || TREE_CODE (fn) == MEMBER_REF); | |
4944 if (type_dependent_expression_p (fn) | |
4945 || any_type_dependent_arguments_p (*args)) | |
4946 return build_min_nt_call_vec (fn, *args); | |
4947 | |
4948 orig_args = make_tree_vector_copy (*args); | |
4949 | |
4950 /* Transform the arguments and add the implicit "this" | |
4951 parameter. That must be done before the FN is transformed | |
4952 because we depend on the form of FN. */ | |
4953 make_args_non_dependent (*args); | |
4954 object = build_non_dependent_expr (object); | |
4955 if (TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE) | |
4956 { | |
4957 if (TREE_CODE (fn) == DOTSTAR_EXPR) | |
4958 object = cp_build_addr_expr (object, complain); | |
4959 vec_safe_insert (*args, 0, object); | |
4960 } | |
4961 /* Now that the arguments are done, transform FN. */ | |
4962 fn = build_non_dependent_expr (fn); | |
4963 } | |
4964 | |
4965 /* A qualified name corresponding to a bound pointer-to-member is | |
4966 represented as an OFFSET_REF: | |
4967 | |
4968 struct B { void g(); }; | |
4969 void (B::*p)(); | |
4970 void B::g() { (this->*p)(); } */ | |
4971 if (TREE_CODE (fn) == OFFSET_REF) | |
4972 { | |
4973 tree object_addr = cp_build_addr_expr (object, complain); | |
4974 fn = TREE_OPERAND (fn, 1); | |
4975 fn = get_member_function_from_ptrfunc (&object_addr, fn, | |
4976 complain); | |
4977 vec_safe_insert (*args, 0, object_addr); | |
4978 } | |
4979 | |
4980 if (CLASS_TYPE_P (TREE_TYPE (fn))) | |
4981 expr = build_op_call (fn, args, complain); | |
4982 else | |
4983 expr = cp_build_function_call_vec (fn, args, complain); | |
4984 if (processing_template_decl && expr != error_mark_node) | |
4985 expr = build_min_non_dep_call_vec (expr, orig_fn, orig_args); | |
4986 | |
4987 if (orig_args != NULL) | |
4988 release_tree_vector (orig_args); | |
4989 | |
4990 return expr; | |
4991 } | |
4992 | |
4993 | |
4994 void | |
4995 check_default_args (tree x) | |
4996 { | |
4997 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x)); | |
4998 bool saw_def = false; | |
4999 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE); | |
5000 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i) | |
5001 { | |
5002 if (TREE_PURPOSE (arg)) | |
5003 saw_def = true; | |
5004 else if (saw_def && !PACK_EXPANSION_P (TREE_VALUE (arg))) | |
5005 { | |
5006 error ("default argument missing for parameter %P of %q+#D", i, x); | |
5007 TREE_PURPOSE (arg) = error_mark_node; | |
5008 } | |
5009 } | |
5010 } | |
5011 | |
5012 /* Return true if function DECL can be inlined. This is used to force | |
5013 instantiation of methods that might be interesting for inlining. */ | |
5014 bool | |
5015 possibly_inlined_p (tree decl) | |
5016 { | |
5017 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL); | |
5018 if (DECL_UNINLINABLE (decl)) | |
5019 return false; | |
5020 if (!optimize) | |
5021 return DECL_DECLARED_INLINE_P (decl); | |
5022 /* When optimizing, we might inline everything when flatten | |
5023 attribute or heuristics inlining for size or autoinlining | |
5024 is used. */ | |
5025 return true; | |
5026 } | |
5027 | |
5028 /* Normally, we can wait until instantiation-time to synthesize DECL. | |
5029 However, if DECL is a static data member initialized with a constant | |
5030 or a constexpr function, we need it right now because a reference to | |
5031 such a data member or a call to such function is not value-dependent. | |
5032 For a function that uses auto in the return type, we need to instantiate | |
5033 it to find out its type. For OpenMP user defined reductions, we need | |
5034 them instantiated for reduction clauses which inline them by hand | |
5035 directly. */ | |
5036 | |
5037 static void | |
5038 maybe_instantiate_decl (tree decl) | |
5039 { | |
5040 if (DECL_LANG_SPECIFIC (decl) | |
5041 && DECL_TEMPLATE_INFO (decl) | |
5042 && (decl_maybe_constant_var_p (decl) | |
5043 || (TREE_CODE (decl) == FUNCTION_DECL | |
5044 && DECL_OMP_DECLARE_REDUCTION_P (decl)) | |
5045 || undeduced_auto_decl (decl)) | |
5046 && !DECL_DECLARED_CONCEPT_P (decl) | |
5047 && !uses_template_parms (DECL_TI_ARGS (decl))) | |
5048 { | |
5049 /* Instantiating a function will result in garbage collection. We | |
5050 must treat this situation as if we were within the body of a | |
5051 function so as to avoid collecting live data only referenced from | |
5052 the stack (such as overload resolution candidates). */ | |
5053 ++function_depth; | |
5054 instantiate_decl (decl, /*defer_ok=*/false, | |
5055 /*expl_inst_class_mem_p=*/false); | |
5056 --function_depth; | |
5057 } | |
5058 } | |
5059 | |
5060 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program. | |
5061 If DECL is a specialization or implicitly declared class member, | |
5062 generate the actual definition. Return false if something goes | |
5063 wrong, true otherwise. */ | |
5064 | |
5065 bool | |
5066 mark_used (tree decl, tsubst_flags_t complain) | |
5067 { | |
5068 /* If DECL is a BASELINK for a single function, then treat it just | |
5069 like the DECL for the function. Otherwise, if the BASELINK is | |
5070 for an overloaded function, we don't know which function was | |
5071 actually used until after overload resolution. */ | |
5072 if (BASELINK_P (decl)) | |
5073 { | |
5074 decl = BASELINK_FUNCTIONS (decl); | |
5075 if (really_overloaded_fn (decl)) | |
5076 return true; | |
5077 decl = OVL_FIRST (decl); | |
5078 } | |
5079 | |
5080 /* Set TREE_USED for the benefit of -Wunused. */ | |
5081 TREE_USED (decl) = 1; | |
5082 /* And for structured bindings also the underlying decl. */ | |
5083 if (DECL_DECOMPOSITION_P (decl) && DECL_DECOMP_BASE (decl)) | |
5084 TREE_USED (DECL_DECOMP_BASE (decl)) = 1; | |
5085 | |
5086 if (TREE_CODE (decl) == TEMPLATE_DECL) | |
5087 return true; | |
5088 | |
5089 if (DECL_CLONED_FUNCTION_P (decl)) | |
5090 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1; | |
5091 | |
5092 /* Mark enumeration types as used. */ | |
5093 if (TREE_CODE (decl) == CONST_DECL) | |
5094 used_types_insert (DECL_CONTEXT (decl)); | |
5095 | |
5096 if (TREE_CODE (decl) == FUNCTION_DECL | |
5097 && !maybe_instantiate_noexcept (decl, complain)) | |
5098 return false; | |
5099 | |
5100 if (TREE_CODE (decl) == FUNCTION_DECL | |
5101 && DECL_DELETED_FN (decl)) | |
5102 { | |
5103 if (DECL_ARTIFICIAL (decl) | |
5104 && DECL_OVERLOADED_OPERATOR_P (decl) == TYPE_EXPR | |
5105 && LAMBDA_TYPE_P (DECL_CONTEXT (decl))) | |
5106 /* We mark a lambda conversion op as deleted if we can't | |
5107 generate it properly; see maybe_add_lambda_conv_op. */ | |
5108 sorry ("converting lambda which uses %<...%> to function pointer"); | |
5109 else if (complain & tf_error) | |
5110 { | |
5111 error ("use of deleted function %qD", decl); | |
5112 if (!maybe_explain_implicit_delete (decl)) | |
5113 inform (DECL_SOURCE_LOCATION (decl), "declared here"); | |
5114 } | |
5115 return false; | |
5116 } | |
5117 | |
5118 if (TREE_DEPRECATED (decl) && (complain & tf_warning) | |
5119 && deprecated_state != DEPRECATED_SUPPRESS) | |
5120 warn_deprecated_use (decl, NULL_TREE); | |
5121 | |
5122 /* We can only check DECL_ODR_USED on variables or functions with | |
5123 DECL_LANG_SPECIFIC set, and these are also the only decls that we | |
5124 might need special handling for. */ | |
5125 if (!VAR_OR_FUNCTION_DECL_P (decl) | |
5126 || DECL_LANG_SPECIFIC (decl) == NULL | |
5127 || DECL_THUNK_P (decl)) | |
5128 { | |
5129 if (!processing_template_decl | |
5130 && !require_deduced_type (decl, complain)) | |
5131 return false; | |
5132 return true; | |
5133 } | |
5134 | |
5135 /* We only want to do this processing once. We don't need to keep trying | |
5136 to instantiate inline templates, because unit-at-a-time will make sure | |
5137 we get them compiled before functions that want to inline them. */ | |
5138 if (DECL_ODR_USED (decl)) | |
5139 return true; | |
5140 | |
5141 /* Normally, we can wait until instantiation-time to synthesize DECL. | |
5142 However, if DECL is a static data member initialized with a constant | |
5143 or a constexpr function, we need it right now because a reference to | |
5144 such a data member or a call to such function is not value-dependent. | |
5145 For a function that uses auto in the return type, we need to instantiate | |
5146 it to find out its type. For OpenMP user defined reductions, we need | |
5147 them instantiated for reduction clauses which inline them by hand | |
5148 directly. */ | |
5149 maybe_instantiate_decl (decl); | |
5150 | |
5151 if (processing_template_decl || in_template_function ()) | |
5152 return true; | |
5153 | |
5154 /* Check this too in case we're within instantiate_non_dependent_expr. */ | |
5155 if (DECL_TEMPLATE_INFO (decl) | |
5156 && uses_template_parms (DECL_TI_ARGS (decl))) | |
5157 return true; | |
5158 | |
5159 if (!require_deduced_type (decl, complain)) | |
5160 return false; | |
5161 | |
5162 if (builtin_pack_fn_p (decl)) | |
5163 { | |
5164 error ("use of built-in parameter pack %qD outside of a template", | |
5165 DECL_NAME (decl)); | |
5166 return false; | |
5167 } | |
5168 | |
5169 /* If we don't need a value, then we don't need to synthesize DECL. */ | |
5170 if (cp_unevaluated_operand || in_discarded_stmt) | |
5171 return true; | |
5172 | |
5173 DECL_ODR_USED (decl) = 1; | |
5174 if (DECL_CLONED_FUNCTION_P (decl)) | |
5175 DECL_ODR_USED (DECL_CLONED_FUNCTION (decl)) = 1; | |
5176 | |
5177 /* DR 757: A type without linkage shall not be used as the type of a | |
5178 variable or function with linkage, unless | |
5179 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or | |
5180 o the variable or function is not used (3.2 [basic.def.odr]) or is | |
5181 defined in the same translation unit. */ | |
5182 if (cxx_dialect > cxx98 | |
5183 && decl_linkage (decl) != lk_none | |
5184 && !DECL_EXTERN_C_P (decl) | |
5185 && !DECL_ARTIFICIAL (decl) | |
5186 && !decl_defined_p (decl) | |
5187 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false)) | |
5188 { | |
5189 if (is_local_extern (decl)) | |
5190 /* There's no way to define a local extern, and adding it to | |
5191 the vector interferes with GC, so give an error now. */ | |
5192 no_linkage_error (decl); | |
5193 else | |
5194 vec_safe_push (no_linkage_decls, decl); | |
5195 } | |
5196 | |
5197 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl) | |
5198 && !DECL_INITIAL (decl) && !DECL_ARTIFICIAL (decl)) | |
5199 /* Remember it, so we can check it was defined. */ | |
5200 note_vague_linkage_fn (decl); | |
5201 | |
5202 /* Is it a synthesized method that needs to be synthesized? */ | |
5203 if (TREE_CODE (decl) == FUNCTION_DECL | |
5204 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl) | |
5205 && DECL_DEFAULTED_FN (decl) | |
5206 /* A function defaulted outside the class is synthesized either by | |
5207 cp_finish_decl or instantiate_decl. */ | |
5208 && !DECL_DEFAULTED_OUTSIDE_CLASS_P (decl) | |
5209 && ! DECL_INITIAL (decl)) | |
5210 { | |
5211 /* Defer virtual destructors so that thunks get the right | |
5212 linkage. */ | |
5213 if (DECL_VIRTUAL_P (decl) && !at_eof) | |
5214 { | |
5215 note_vague_linkage_fn (decl); | |
5216 return true; | |
5217 } | |
5218 | |
5219 /* Remember the current location for a function we will end up | |
5220 synthesizing. Then we can inform the user where it was | |
5221 required in the case of error. */ | |
5222 DECL_SOURCE_LOCATION (decl) = input_location; | |
5223 | |
5224 /* Synthesizing an implicitly defined member function will result in | |
5225 garbage collection. We must treat this situation as if we were | |
5226 within the body of a function so as to avoid collecting live data | |
5227 on the stack (such as overload resolution candidates). | |
5228 | |
5229 We could just let cp_write_global_declarations handle synthesizing | |
5230 this function by adding it to deferred_fns, but doing | |
5231 it at the use site produces better error messages. */ | |
5232 ++function_depth; | |
5233 synthesize_method (decl); | |
5234 --function_depth; | |
5235 /* If this is a synthesized method we don't need to | |
5236 do the instantiation test below. */ | |
5237 } | |
5238 else if (VAR_OR_FUNCTION_DECL_P (decl) | |
5239 && DECL_TEMPLATE_INFO (decl) | |
5240 && !DECL_DECLARED_CONCEPT_P (decl) | |
5241 && (!DECL_EXPLICIT_INSTANTIATION (decl) | |
5242 || always_instantiate_p (decl))) | |
5243 /* If this is a function or variable that is an instance of some | |
5244 template, we now know that we will need to actually do the | |
5245 instantiation. We check that DECL is not an explicit | |
5246 instantiation because that is not checked in instantiate_decl. | |
5247 | |
5248 We put off instantiating functions in order to improve compile | |
5249 times. Maintaining a stack of active functions is expensive, | |
5250 and the inliner knows to instantiate any functions it might | |
5251 need. Therefore, we always try to defer instantiation. */ | |
5252 { | |
5253 ++function_depth; | |
5254 instantiate_decl (decl, /*defer_ok=*/true, | |
5255 /*expl_inst_class_mem_p=*/false); | |
5256 --function_depth; | |
5257 } | |
5258 | |
5259 return true; | |
5260 } | |
5261 | |
5262 bool | |
5263 mark_used (tree decl) | |
5264 { | |
5265 return mark_used (decl, tf_warning_or_error); | |
5266 } | |
5267 | |
5268 tree | |
5269 vtv_start_verification_constructor_init_function (void) | |
5270 { | |
5271 return start_objects ('I', MAX_RESERVED_INIT_PRIORITY - 1); | |
5272 } | |
5273 | |
5274 tree | |
5275 vtv_finish_verification_constructor_init_function (tree function_body) | |
5276 { | |
5277 tree fn; | |
5278 | |
5279 finish_compound_stmt (function_body); | |
5280 fn = finish_function (/*inline_p=*/false); | |
5281 DECL_STATIC_CONSTRUCTOR (fn) = 1; | |
5282 decl_init_priority_insert (fn, MAX_RESERVED_INIT_PRIORITY - 1); | |
5283 | |
5284 return fn; | |
5285 } | |
5286 | |
5287 #include "gt-cp-decl2.h" |