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8d08fdba MS |
1 | /* Breadth-first and depth-first routines for |
2 | searching multiple-inheritance lattice for GNU C++. | |
59be0cdd | 3 | Copyright (C) 1987, 1989, 1992, 1993, 1995 Free Software Foundation, Inc. |
8d08fdba MS |
4 | Contributed by Michael Tiemann (tiemann@cygnus.com) |
5 | ||
6 | This file is part of GNU CC. | |
7 | ||
8 | GNU CC is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2, or (at your option) | |
11 | any later version. | |
12 | ||
13 | GNU CC is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with GNU CC; see the file COPYING. If not, write to | |
e9fa0c7c RK |
20 | the Free Software Foundation, 59 Temple Place - Suite 330, |
21 | Boston, MA 02111-1307, USA. */ | |
8d08fdba MS |
22 | |
23 | /* High-level class interface. */ | |
24 | ||
25 | #include "config.h" | |
26 | #include "tree.h" | |
27 | #include <stdio.h> | |
28 | #include "cp-tree.h" | |
29 | #include "obstack.h" | |
30 | #include "flags.h" | |
43f2999d | 31 | #include "rtl.h" |
e8abc66f | 32 | #include "output.h" |
8d08fdba MS |
33 | |
34 | #define obstack_chunk_alloc xmalloc | |
35 | #define obstack_chunk_free free | |
36 | ||
37 | void init_search (); | |
38 | extern struct obstack *current_obstack; | |
e8abc66f | 39 | extern tree abort_fndecl; |
8d08fdba MS |
40 | |
41 | #include "stack.h" | |
42 | ||
43 | /* Obstack used for remembering decision points of breadth-first. */ | |
44 | static struct obstack search_obstack; | |
45 | ||
46 | /* Methods for pushing and popping objects to and from obstacks. */ | |
47 | struct stack_level * | |
48 | push_stack_level (obstack, tp, size) | |
49 | struct obstack *obstack; | |
50 | char *tp; /* Sony NewsOS 5.0 compiler doesn't like void * here. */ | |
51 | int size; | |
52 | { | |
53 | struct stack_level *stack; | |
54 | obstack_grow (obstack, tp, size); | |
55 | stack = (struct stack_level *) ((char*)obstack_next_free (obstack) - size); | |
56 | obstack_finish (obstack); | |
57 | stack->obstack = obstack; | |
58 | stack->first = (tree *) obstack_base (obstack); | |
59 | stack->limit = obstack_room (obstack) / sizeof (tree *); | |
60 | return stack; | |
61 | } | |
62 | ||
63 | struct stack_level * | |
64 | pop_stack_level (stack) | |
65 | struct stack_level *stack; | |
66 | { | |
67 | struct stack_level *tem = stack; | |
68 | struct obstack *obstack = tem->obstack; | |
69 | stack = tem->prev; | |
70 | obstack_free (obstack, tem); | |
71 | return stack; | |
72 | } | |
73 | ||
74 | #define search_level stack_level | |
75 | static struct search_level *search_stack; | |
76 | ||
77 | static tree lookup_field_1 (); | |
78 | static int lookup_fnfields_1 (); | |
79 | static void dfs_walk (); | |
80 | static int markedp (); | |
81 | static void dfs_unmark (); | |
82 | static void dfs_init_vbase_pointers (); | |
83 | ||
84 | static tree vbase_types; | |
85 | static tree vbase_decl, vbase_decl_ptr; | |
86 | static tree vbase_decl_ptr_intermediate; | |
87 | static tree vbase_init_result; | |
88 | ||
89 | /* Allocate a level of searching. */ | |
90 | static struct search_level * | |
91 | push_search_level (stack, obstack) | |
92 | struct stack_level *stack; | |
93 | struct obstack *obstack; | |
94 | { | |
95 | struct search_level tem; | |
96 | ||
97 | tem.prev = stack; | |
98 | return push_stack_level (obstack, (char *)&tem, sizeof (tem)); | |
99 | } | |
100 | ||
101 | /* Discard a level of search allocation. */ | |
102 | static struct search_level * | |
103 | pop_search_level (obstack) | |
104 | struct stack_level *obstack; | |
105 | { | |
106 | register struct search_level *stack = pop_stack_level (obstack); | |
107 | ||
108 | return stack; | |
109 | } | |
110 | \f | |
111 | /* Search memoization. */ | |
112 | struct type_level | |
113 | { | |
114 | struct stack_level base; | |
115 | ||
116 | /* First object allocated in obstack of entries. */ | |
117 | char *entries; | |
118 | ||
119 | /* Number of types memoized in this context. */ | |
120 | int len; | |
121 | ||
122 | /* Type being memoized; save this if we are saving | |
123 | memoized contexts. */ | |
124 | tree type; | |
125 | }; | |
126 | ||
127 | /* Obstack used for memoizing member and member function lookup. */ | |
128 | ||
129 | static struct obstack type_obstack, type_obstack_entries; | |
130 | static struct type_level *type_stack; | |
131 | static tree _vptr_name; | |
132 | ||
133 | /* Make things that look like tree nodes, but allocate them | |
134 | on type_obstack_entries. */ | |
135 | static int my_tree_node_counter; | |
136 | static tree my_tree_cons (), my_build_string (); | |
137 | ||
138 | extern int flag_memoize_lookups, flag_save_memoized_contexts; | |
139 | ||
140 | /* Variables for gathering statistics. */ | |
141 | static int my_memoized_entry_counter; | |
142 | static int memoized_fast_finds[2], memoized_adds[2], memoized_fast_rejects[2]; | |
143 | static int memoized_fields_searched[2]; | |
144 | static int n_fields_searched; | |
145 | static int n_calls_lookup_field, n_calls_lookup_field_1; | |
146 | static int n_calls_lookup_fnfields, n_calls_lookup_fnfields_1; | |
147 | static int n_calls_get_base_type; | |
148 | static int n_outer_fields_searched; | |
149 | static int n_contexts_saved; | |
150 | ||
151 | /* Local variables to help save memoization contexts. */ | |
152 | static tree prev_type_memoized; | |
153 | static struct type_level *prev_type_stack; | |
154 | ||
155 | /* This list is used by push_class_decls to know what decls need to | |
156 | be pushed into class scope. */ | |
157 | static tree closed_envelopes = NULL_TREE; | |
158 | ||
159 | /* Allocate a level of type memoization context. */ | |
160 | static struct type_level * | |
161 | push_type_level (stack, obstack) | |
162 | struct stack_level *stack; | |
163 | struct obstack *obstack; | |
164 | { | |
165 | struct type_level tem; | |
166 | ||
167 | tem.base.prev = stack; | |
168 | ||
169 | obstack_finish (&type_obstack_entries); | |
170 | tem.entries = (char *) obstack_base (&type_obstack_entries); | |
171 | tem.len = 0; | |
172 | tem.type = NULL_TREE; | |
173 | ||
174 | return (struct type_level *)push_stack_level (obstack, (char *)&tem, sizeof (tem)); | |
175 | } | |
176 | ||
177 | /* Discard a level of type memoization context. */ | |
178 | ||
179 | static struct type_level * | |
180 | pop_type_level (stack) | |
181 | struct type_level *stack; | |
182 | { | |
183 | obstack_free (&type_obstack_entries, stack->entries); | |
184 | return (struct type_level *)pop_stack_level ((struct stack_level *)stack); | |
185 | } | |
186 | ||
187 | /* Make something that looks like a TREE_LIST, but | |
188 | do it on the type_obstack_entries obstack. */ | |
189 | static tree | |
190 | my_tree_cons (purpose, value, chain) | |
191 | tree purpose, value, chain; | |
192 | { | |
193 | tree p = (tree)obstack_alloc (&type_obstack_entries, sizeof (struct tree_list)); | |
194 | ++my_tree_node_counter; | |
195 | TREE_TYPE (p) = NULL_TREE; | |
196 | ((HOST_WIDE_INT *)p)[3] = 0; | |
197 | TREE_SET_CODE (p, TREE_LIST); | |
198 | TREE_PURPOSE (p) = purpose; | |
199 | TREE_VALUE (p) = value; | |
200 | TREE_CHAIN (p) = chain; | |
201 | return p; | |
202 | } | |
203 | ||
204 | static tree | |
205 | my_build_string (str) | |
206 | char *str; | |
207 | { | |
208 | tree p = (tree)obstack_alloc (&type_obstack_entries, sizeof (struct tree_string)); | |
209 | ++my_tree_node_counter; | |
210 | TREE_TYPE (p) = 0; | |
211 | ((int *)p)[3] = 0; | |
212 | TREE_SET_CODE (p, STRING_CST); | |
213 | TREE_STRING_POINTER (p) = str; | |
214 | TREE_STRING_LENGTH (p) = strlen (str); | |
215 | return p; | |
216 | } | |
217 | \f | |
218 | /* Memoizing machinery to make searches for multiple inheritance | |
219 | reasonably efficient. */ | |
220 | #define MEMOIZE_HASHSIZE 8 | |
221 | typedef struct memoized_entry | |
222 | { | |
223 | struct memoized_entry *chain; | |
224 | int uid; | |
225 | tree data_members[MEMOIZE_HASHSIZE]; | |
226 | tree function_members[MEMOIZE_HASHSIZE]; | |
227 | } *ME; | |
228 | ||
229 | #define MEMOIZED_CHAIN(ENTRY) (((ME)ENTRY)->chain) | |
230 | #define MEMOIZED_UID(ENTRY) (((ME)ENTRY)->uid) | |
231 | #define MEMOIZED_FIELDS(ENTRY,INDEX) (((ME)ENTRY)->data_members[INDEX]) | |
232 | #define MEMOIZED_FNFIELDS(ENTRY,INDEX) (((ME)ENTRY)->function_members[INDEX]) | |
233 | /* The following is probably a lousy hash function. */ | |
234 | #define MEMOIZED_HASH_FN(NODE) (((long)(NODE)>>4)&(MEMOIZE_HASHSIZE - 1)) | |
235 | ||
236 | static struct memoized_entry * | |
237 | my_new_memoized_entry (chain) | |
238 | struct memoized_entry *chain; | |
239 | { | |
240 | struct memoized_entry *p = | |
241 | (struct memoized_entry *)obstack_alloc (&type_obstack_entries, | |
242 | sizeof (struct memoized_entry)); | |
1daa5dd8 | 243 | bzero ((char *) p, sizeof (struct memoized_entry)); |
8d08fdba MS |
244 | MEMOIZED_CHAIN (p) = chain; |
245 | MEMOIZED_UID (p) = ++my_memoized_entry_counter; | |
246 | return p; | |
247 | } | |
248 | ||
249 | /* Make an entry in the memoized table for type TYPE | |
250 | that the entry for NAME is FIELD. */ | |
251 | ||
252 | tree | |
253 | make_memoized_table_entry (type, name, function_p) | |
254 | tree type, name; | |
255 | int function_p; | |
256 | { | |
257 | int index = MEMOIZED_HASH_FN (name); | |
258 | tree entry, *prev_entry; | |
259 | ||
260 | memoized_adds[function_p] += 1; | |
261 | if (CLASSTYPE_MTABLE_ENTRY (type) == 0) | |
262 | { | |
263 | obstack_ptr_grow (&type_obstack, type); | |
264 | obstack_blank (&type_obstack, sizeof (struct memoized_entry *)); | |
265 | CLASSTYPE_MTABLE_ENTRY (type) = (char *)my_new_memoized_entry ((struct memoized_entry *)0); | |
266 | type_stack->len++; | |
267 | if (type_stack->len * 2 >= type_stack->base.limit) | |
268 | my_friendly_abort (88); | |
269 | } | |
270 | if (function_p) | |
271 | prev_entry = &MEMOIZED_FNFIELDS (CLASSTYPE_MTABLE_ENTRY (type), index); | |
272 | else | |
273 | prev_entry = &MEMOIZED_FIELDS (CLASSTYPE_MTABLE_ENTRY (type), index); | |
274 | ||
275 | entry = my_tree_cons (name, NULL_TREE, *prev_entry); | |
276 | *prev_entry = entry; | |
277 | ||
278 | /* Don't know the error message to give yet. */ | |
279 | TREE_TYPE (entry) = error_mark_node; | |
280 | ||
281 | return entry; | |
282 | } | |
283 | ||
284 | /* When a new function or class context is entered, we build | |
285 | a table of types which have been searched for members. | |
286 | The table is an array (obstack) of types. When a type is | |
287 | entered into the obstack, its CLASSTYPE_MTABLE_ENTRY | |
288 | field is set to point to a new record, of type struct memoized_entry. | |
289 | ||
290 | A non-NULL TREE_TYPE of the entry contains an access control error message. | |
291 | ||
292 | The slots for the data members are arrays of tree nodes. | |
293 | These tree nodes are lists, with the TREE_PURPOSE | |
294 | of this list the known member name, and the TREE_VALUE | |
295 | as the FIELD_DECL for the member. | |
296 | ||
297 | For member functions, the TREE_PURPOSE is again the | |
298 | name of the member functions for that class, | |
299 | and the TREE_VALUE of the list is a pairs | |
300 | whose TREE_PURPOSE is a member functions of this name, | |
301 | and whose TREE_VALUE is a list of known argument lists this | |
302 | member function has been called with. The TREE_TYPE of the pair, | |
303 | if non-NULL, is an error message to print. */ | |
304 | ||
305 | /* Tell search machinery that we are entering a new context, and | |
306 | to update tables appropriately. | |
307 | ||
308 | TYPE is the type of the context we are entering, which can | |
309 | be NULL_TREE if we are not in a class's scope. | |
310 | ||
311 | USE_OLD, if nonzero tries to use previous context. */ | |
312 | void | |
313 | push_memoized_context (type, use_old) | |
314 | tree type; | |
315 | int use_old; | |
316 | { | |
317 | int len; | |
318 | tree *tem; | |
319 | ||
320 | if (prev_type_stack) | |
321 | { | |
322 | if (use_old && prev_type_memoized == type) | |
323 | { | |
324 | #ifdef GATHER_STATISTICS | |
325 | n_contexts_saved++; | |
326 | #endif | |
327 | type_stack = prev_type_stack; | |
328 | prev_type_stack = 0; | |
329 | ||
330 | tem = &type_stack->base.first[0]; | |
331 | len = type_stack->len; | |
332 | while (len--) | |
333 | CLASSTYPE_MTABLE_ENTRY (tem[len*2]) = (char *)tem[len*2+1]; | |
334 | return; | |
335 | } | |
336 | /* Otherwise, need to pop old stack here. */ | |
337 | type_stack = pop_type_level (prev_type_stack); | |
338 | prev_type_memoized = 0; | |
339 | prev_type_stack = 0; | |
340 | } | |
341 | ||
342 | type_stack = push_type_level ((struct stack_level *)type_stack, | |
343 | &type_obstack); | |
344 | type_stack->type = type; | |
345 | } | |
346 | ||
347 | /* Tell search machinery that we have left a context. | |
348 | We do not currently save these contexts for later use. | |
349 | If we wanted to, we could not use pop_search_level, since | |
350 | poping that level allows the data we have collected to | |
351 | be clobbered; a stack of obstacks would be needed. */ | |
352 | void | |
353 | pop_memoized_context (use_old) | |
354 | int use_old; | |
355 | { | |
356 | int len; | |
357 | tree *tem = &type_stack->base.first[0]; | |
358 | ||
359 | if (! flag_save_memoized_contexts) | |
360 | use_old = 0; | |
361 | else if (use_old) | |
362 | { | |
363 | len = type_stack->len; | |
364 | while (len--) | |
365 | tem[len*2+1] = (tree)CLASSTYPE_MTABLE_ENTRY (tem[len*2]); | |
366 | ||
367 | prev_type_stack = type_stack; | |
368 | prev_type_memoized = type_stack->type; | |
369 | } | |
370 | ||
371 | if (flag_memoize_lookups) | |
372 | { | |
373 | len = type_stack->len; | |
374 | while (len--) | |
375 | CLASSTYPE_MTABLE_ENTRY (tem[len*2]) | |
376 | = (char *)MEMOIZED_CHAIN (CLASSTYPE_MTABLE_ENTRY (tem[len*2])); | |
377 | } | |
378 | if (! use_old) | |
379 | type_stack = pop_type_level (type_stack); | |
380 | else | |
381 | type_stack = (struct type_level *)type_stack->base.prev; | |
382 | } | |
383 | \f | |
384 | /* This is the newer recursive depth first search routine. */ | |
db5ae43f | 385 | #if 0 /* unused */ |
8d08fdba MS |
386 | /* Return non-zero if PARENT is directly derived from TYPE. By directly |
387 | we mean it's only one step up the inheritance lattice. We check this | |
388 | by walking horizontally across the types that TYPE directly inherits | |
389 | from, to see if PARENT is among them. This is used by get_binfo and | |
390 | by compute_access. */ | |
391 | static int | |
392 | immediately_derived (parent, type) | |
393 | tree parent, type; | |
394 | { | |
395 | if (TYPE_BINFO (type)) | |
396 | { | |
397 | tree binfos = BINFO_BASETYPES (TYPE_BINFO (type)); | |
398 | int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0; | |
399 | ||
400 | for (i = 0; i < n_baselinks; i++) | |
401 | { | |
402 | tree base_binfo = TREE_VEC_ELT (binfos, i); | |
403 | ||
404 | if (parent == BINFO_TYPE (base_binfo)) | |
405 | return 1; | |
406 | } | |
407 | } | |
408 | return 0; | |
409 | } | |
8926095f | 410 | #endif |
8d08fdba MS |
411 | |
412 | /* Check whether the type given in BINFO is derived from PARENT. If | |
413 | it isn't, return 0. If it is, but the derivation is MI-ambiguous | |
414 | AND protect != 0, emit an error message and return error_mark_node. | |
415 | ||
416 | Otherwise, if TYPE is derived from PARENT, return the actual base | |
417 | information, unless a one of the protection violations below | |
418 | occurs, in which case emit an error message and return error_mark_node. | |
419 | ||
420 | If PROTECT is 1, then check if access to a public field of PARENT | |
421 | would be private. Also check for ambiguity. */ | |
422 | ||
423 | tree | |
424 | get_binfo (parent, binfo, protect) | |
425 | register tree parent, binfo; | |
426 | int protect; | |
427 | { | |
428 | tree type; | |
429 | int dist; | |
430 | tree rval = NULL_TREE; | |
431 | ||
432 | if (TREE_CODE (parent) == TREE_VEC) | |
433 | parent = BINFO_TYPE (parent); | |
71851aaa | 434 | else if (! IS_AGGR_TYPE_CODE (TREE_CODE (parent))) |
8d08fdba MS |
435 | my_friendly_abort (89); |
436 | ||
437 | if (TREE_CODE (binfo) == TREE_VEC) | |
438 | type = BINFO_TYPE (binfo); | |
71851aaa | 439 | else if (IS_AGGR_TYPE_CODE (TREE_CODE (binfo))) |
8d08fdba MS |
440 | type = binfo; |
441 | else | |
442 | my_friendly_abort (90); | |
443 | ||
444 | dist = get_base_distance (parent, binfo, protect, &rval); | |
445 | ||
446 | if (dist == -3) | |
447 | { | |
448 | cp_error ("fields of `%T' are inaccessible in `%T' due to private inheritance", | |
449 | parent, type); | |
450 | return error_mark_node; | |
451 | } | |
452 | else if (dist == -2 && protect) | |
453 | { | |
454 | cp_error ("type `%T' is ambiguous base class for type `%T'", parent, | |
455 | type); | |
456 | return error_mark_node; | |
457 | } | |
458 | ||
459 | return rval; | |
460 | } | |
461 | ||
462 | /* This is the newer depth first get_base_distance routine. */ | |
8926095f | 463 | static int |
8d08fdba MS |
464 | get_base_distance_recursive (binfo, depth, is_private, basetype_path, rval, |
465 | rval_private_ptr, new_binfo_ptr, parent, path_ptr, | |
466 | protect, via_virtual_ptr, via_virtual) | |
467 | tree binfo, basetype_path, *new_binfo_ptr, parent, *path_ptr; | |
468 | int *rval_private_ptr, depth, is_private, rval, protect, *via_virtual_ptr, | |
469 | via_virtual; | |
470 | { | |
471 | tree binfos; | |
472 | int i, n_baselinks; | |
473 | ||
474 | if (BINFO_TYPE (binfo) == parent || binfo == parent) | |
475 | { | |
476 | if (rval == -1) | |
477 | { | |
478 | rval = depth; | |
479 | *rval_private_ptr = is_private; | |
480 | *new_binfo_ptr = binfo; | |
481 | *via_virtual_ptr = via_virtual; | |
482 | } | |
483 | else | |
484 | { | |
51c184be MS |
485 | int same_object = (tree_int_cst_equal (BINFO_OFFSET (*new_binfo_ptr), |
486 | BINFO_OFFSET (binfo)) | |
487 | && *via_virtual_ptr && via_virtual); | |
488 | ||
8d08fdba MS |
489 | if (*via_virtual_ptr && via_virtual==0) |
490 | { | |
491 | *rval_private_ptr = is_private; | |
492 | *new_binfo_ptr = binfo; | |
493 | *via_virtual_ptr = via_virtual; | |
494 | } | |
495 | else if (same_object) | |
496 | { | |
497 | if (*rval_private_ptr && ! is_private) | |
498 | { | |
499 | *rval_private_ptr = is_private; | |
500 | *new_binfo_ptr = binfo; | |
501 | *via_virtual_ptr = via_virtual; | |
502 | } | |
503 | return rval; | |
504 | } | |
505 | ||
506 | rval = -2; | |
507 | } | |
508 | return rval; | |
509 | } | |
510 | ||
511 | binfos = BINFO_BASETYPES (binfo); | |
512 | n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0; | |
513 | depth += 1; | |
514 | ||
515 | /* Process base types. */ | |
516 | for (i = 0; i < n_baselinks; i++) | |
517 | { | |
518 | tree base_binfo = TREE_VEC_ELT (binfos, i); | |
519 | ||
520 | /* Find any specific instance of a virtual base, when searching with | |
521 | a binfo... */ | |
522 | if (BINFO_MARKED (base_binfo) == 0 || TREE_CODE (parent) == TREE_VEC) | |
523 | { | |
524 | int via_private | |
525 | = (protect | |
526 | && (is_private | |
527 | || (!TREE_VIA_PUBLIC (base_binfo) | |
528 | && !is_friend (BINFO_TYPE (binfo), current_scope ())))); | |
529 | int this_virtual = via_virtual || TREE_VIA_VIRTUAL (base_binfo); | |
530 | int was; | |
531 | ||
532 | /* When searching for a non-virtual, we cannot mark | |
533 | virtually found binfos. */ | |
534 | if (! this_virtual) | |
535 | SET_BINFO_MARKED (base_binfo); | |
536 | ||
537 | #define WATCH_VALUES(rval, via_private) (rval == -1 ? 3 : via_private) | |
538 | ||
539 | was = WATCH_VALUES (rval, *via_virtual_ptr); | |
540 | rval = get_base_distance_recursive (base_binfo, depth, via_private, | |
541 | binfo, rval, rval_private_ptr, | |
542 | new_binfo_ptr, parent, path_ptr, | |
543 | protect, via_virtual_ptr, | |
544 | this_virtual); | |
545 | /* watch for updates; only update if path is good. */ | |
546 | if (path_ptr && WATCH_VALUES (rval, *via_virtual_ptr) != was) | |
547 | BINFO_INHERITANCE_CHAIN (base_binfo) = binfo; | |
548 | if (rval == -2 && *via_virtual_ptr == 0) | |
549 | return rval; | |
550 | ||
551 | #undef WATCH_VALUES | |
552 | ||
553 | } | |
554 | } | |
555 | ||
556 | return rval; | |
557 | } | |
558 | ||
559 | /* Return the number of levels between type PARENT and the type given | |
560 | in BINFO, following the leftmost path to PARENT not found along a | |
561 | virtual path, if there are no real PARENTs (all come from virtual | |
562 | base classes), then follow the leftmost path to PARENT. | |
563 | ||
564 | Return -1 if TYPE is not derived from PARENT. | |
565 | Return -2 if PARENT is an ambiguous base class of TYPE, and PROTECT is | |
566 | non-negative. | |
567 | Return -3 if PARENT is private to TYPE, and PROTECT is non-zero. | |
568 | ||
569 | If PATH_PTR is non-NULL, then also build the list of types | |
ddd5a7c1 | 570 | from PARENT to TYPE, with TREE_VIA_VIRTUAL and TREE_VIA_PUBLIC |
8d08fdba MS |
571 | set. |
572 | ||
573 | PARENT can also be a binfo, in which case that exact parent is found | |
574 | and no other. convert_pointer_to_real uses this functionality. | |
575 | ||
39211cd5 | 576 | If BINFO is a binfo, its BINFO_INHERITANCE_CHAIN will be left alone. */ |
8d08fdba MS |
577 | |
578 | int | |
579 | get_base_distance (parent, binfo, protect, path_ptr) | |
580 | register tree parent, binfo; | |
581 | int protect; | |
582 | tree *path_ptr; | |
583 | { | |
8d08fdba | 584 | int rval; |
8d08fdba MS |
585 | int rval_private = 0; |
586 | tree type; | |
587 | tree new_binfo = NULL_TREE; | |
588 | int via_virtual; | |
589 | int watch_access = protect; | |
590 | ||
591 | if (TREE_CODE (parent) != TREE_VEC) | |
592 | parent = TYPE_MAIN_VARIANT (parent); | |
593 | ||
594 | if (TREE_CODE (binfo) == TREE_VEC) | |
595 | type = BINFO_TYPE (binfo); | |
f0e01782 | 596 | else if (IS_AGGR_TYPE_CODE (TREE_CODE (binfo))) |
8d08fdba MS |
597 | { |
598 | type = binfo; | |
599 | binfo = TYPE_BINFO (type); | |
600 | ||
601 | if (path_ptr) | |
602 | BINFO_INHERITANCE_CHAIN (binfo) = NULL_TREE; | |
603 | } | |
604 | else | |
605 | my_friendly_abort (92); | |
606 | ||
607 | if (parent == type || parent == binfo) | |
608 | { | |
609 | /* If the distance is 0, then we don't really need | |
610 | a path pointer, but we shouldn't let garbage go back. */ | |
611 | if (path_ptr) | |
612 | *path_ptr = binfo; | |
613 | return 0; | |
614 | } | |
615 | ||
616 | if (path_ptr) | |
617 | watch_access = 1; | |
618 | ||
619 | rval = get_base_distance_recursive (binfo, 0, 0, NULL_TREE, -1, | |
620 | &rval_private, &new_binfo, parent, | |
621 | path_ptr, watch_access, &via_virtual, 0); | |
622 | ||
623 | dfs_walk (binfo, dfs_unmark, markedp); | |
624 | ||
625 | /* Access restrictions don't count if we found an ambiguous basetype. */ | |
626 | if (rval == -2 && protect >= 0) | |
627 | rval_private = 0; | |
628 | ||
629 | if (rval && protect && rval_private) | |
630 | return -3; | |
631 | ||
39211cd5 MS |
632 | /* find real virtual base classes. */ |
633 | if (rval == -1 && TREE_CODE (parent) == TREE_VEC | |
634 | && parent == binfo_member (BINFO_TYPE (parent), | |
635 | CLASSTYPE_VBASECLASSES (type))) | |
636 | { | |
637 | BINFO_INHERITANCE_CHAIN (parent) = binfo; | |
638 | new_binfo = parent; | |
639 | rval = 1; | |
640 | } | |
641 | ||
8d08fdba MS |
642 | if (path_ptr) |
643 | *path_ptr = new_binfo; | |
644 | return rval; | |
645 | } | |
646 | ||
647 | /* Search for a member with name NAME in a multiple inheritance lattice | |
648 | specified by TYPE. If it does not exist, return NULL_TREE. | |
649 | If the member is ambiguously referenced, return `error_mark_node'. | |
650 | Otherwise, return the FIELD_DECL. */ | |
651 | ||
652 | /* Do a 1-level search for NAME as a member of TYPE. The caller must | |
653 | figure out whether it can access this field. (Since it is only one | |
654 | level, this is reasonable.) */ | |
655 | static tree | |
656 | lookup_field_1 (type, name) | |
657 | tree type, name; | |
658 | { | |
659 | register tree field = TYPE_FIELDS (type); | |
660 | ||
661 | #ifdef GATHER_STATISTICS | |
662 | n_calls_lookup_field_1++; | |
663 | #endif | |
664 | while (field) | |
665 | { | |
666 | #ifdef GATHER_STATISTICS | |
667 | n_fields_searched++; | |
668 | #endif | |
669 | if (DECL_NAME (field) == NULL_TREE | |
670 | && TREE_CODE (TREE_TYPE (field)) == UNION_TYPE) | |
671 | { | |
672 | tree temp = lookup_field_1 (TREE_TYPE (field), name); | |
673 | if (temp) | |
674 | return temp; | |
675 | } | |
676 | if (DECL_NAME (field) == name) | |
677 | { | |
678 | if ((TREE_CODE(field) == VAR_DECL || TREE_CODE(field) == CONST_DECL) | |
679 | && DECL_ASSEMBLER_NAME (field) != NULL) | |
680 | GNU_xref_ref(current_function_decl, | |
681 | IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (field))); | |
682 | return field; | |
683 | } | |
684 | field = TREE_CHAIN (field); | |
685 | } | |
686 | /* Not found. */ | |
687 | if (name == _vptr_name) | |
688 | { | |
689 | /* Give the user what s/he thinks s/he wants. */ | |
690 | if (TYPE_VIRTUAL_P (type)) | |
691 | return CLASSTYPE_VFIELD (type); | |
692 | } | |
693 | return NULL_TREE; | |
694 | } | |
695 | ||
7177d104 MS |
696 | /* There are a number of cases we need to be aware of here: |
697 | current_class_type current_function_decl | |
698 | * global NULL NULL | |
699 | * fn-local NULL SET | |
700 | * class-local SET NULL | |
701 | * class->fn SET SET | |
702 | * fn->class SET SET | |
703 | ||
704 | Those last two make life interesting. If we're in a function which is | |
705 | itself inside a class, we need decls to go into the fn's decls (our | |
706 | second case below). But if we're in a class and the class itself is | |
707 | inside a function, we need decls to go into the decls for the class. To | |
708 | achieve this last goal, we must see if, when both current_class_decl and | |
709 | current_function_decl are set, the class was declared inside that | |
710 | function. If so, we know to put the decls into the class's scope. */ | |
711 | ||
8d08fdba MS |
712 | tree |
713 | current_scope () | |
714 | { | |
715 | if (current_function_decl == NULL_TREE) | |
716 | return current_class_type; | |
717 | if (current_class_type == NULL_TREE) | |
718 | return current_function_decl; | |
719 | if (DECL_CLASS_CONTEXT (current_function_decl) == current_class_type) | |
720 | return current_function_decl; | |
721 | ||
722 | return current_class_type; | |
723 | } | |
724 | ||
725 | /* Compute the access of FIELD. This is done by computing | |
726 | the access available to each type in BASETYPES (which comes | |
727 | as a list of [via_public/basetype] in reverse order, namely base | |
728 | class before derived class). The first one which defines a | |
729 | access defines the access for the field. Otherwise, the | |
730 | access of the field is that which occurs normally. | |
731 | ||
732 | Uses global variables CURRENT_CLASS_TYPE and | |
733 | CURRENT_FUNCTION_DECL to use friend relationships | |
734 | if necessary. | |
735 | ||
736 | This will be static when lookup_fnfield comes into this file. | |
737 | ||
738 | access_public means that the field can be accessed by the current lexical | |
739 | scope. | |
740 | ||
741 | access_protected means that the field cannot be accessed by the current | |
742 | lexical scope because it is protected. | |
743 | ||
744 | access_private means that the field cannot be accessed by the current | |
745 | lexical scope because it is private. */ | |
746 | ||
747 | #if 0 | |
748 | #define PUBLIC_RETURN return (DECL_PUBLIC (field) = 1), access_public | |
749 | #define PROTECTED_RETURN return (DECL_PROTECTED (field) = 1), access_protected | |
750 | #define PRIVATE_RETURN return (DECL_PRIVATE (field) = 1), access_private | |
751 | #else | |
752 | #define PUBLIC_RETURN return access_public | |
753 | #define PROTECTED_RETURN return access_protected | |
754 | #define PRIVATE_RETURN return access_private | |
755 | #endif | |
756 | ||
757 | #if 0 | |
758 | /* Disabled with DECL_PUBLIC &c. */ | |
759 | static tree previous_scope = NULL_TREE; | |
760 | #endif | |
761 | ||
762 | enum access_type | |
763 | compute_access (basetype_path, field) | |
764 | tree basetype_path, field; | |
765 | { | |
766 | enum access_type access; | |
767 | tree types; | |
768 | tree context; | |
769 | int protected_ok, via_protected; | |
eae89e04 | 770 | extern int flag_access_control; |
8d08fdba MS |
771 | #if 1 |
772 | /* Replaces static decl above. */ | |
773 | tree previous_scope; | |
774 | #endif | |
39211cd5 MS |
775 | int static_mem = |
776 | ((TREE_CODE (field) == FUNCTION_DECL && DECL_STATIC_FUNCTION_P (field)) | |
777 | || (TREE_CODE (field) != FUNCTION_DECL && TREE_STATIC (field))); | |
8d08fdba | 778 | |
eae89e04 JM |
779 | if (! flag_access_control) |
780 | return access_public; | |
781 | ||
8d08fdba MS |
782 | /* The field lives in the current class. */ |
783 | if (BINFO_TYPE (basetype_path) == current_class_type) | |
784 | return access_public; | |
785 | ||
786 | #if 0 | |
787 | /* Disabled until pushing function scope clears these out. If ever. */ | |
788 | /* Make these special cases fast. */ | |
789 | if (current_scope () == previous_scope) | |
790 | { | |
791 | if (DECL_PUBLIC (field)) | |
792 | return access_public; | |
793 | if (DECL_PROTECTED (field)) | |
794 | return access_protected; | |
795 | if (DECL_PRIVATE (field)) | |
796 | return access_private; | |
797 | } | |
798 | #endif | |
799 | ||
faae18ab MS |
800 | /* We don't currently support access control on nested types. */ |
801 | if (TREE_CODE (field) == TYPE_DECL) | |
802 | return access_public; | |
803 | ||
8d08fdba MS |
804 | previous_scope = current_scope (); |
805 | ||
806 | context = DECL_CLASS_CONTEXT (field); | |
807 | if (context == NULL_TREE) | |
808 | context = DECL_CONTEXT (field); | |
809 | ||
810 | /* Fields coming from nested anonymous unions have their DECL_CLASS_CONTEXT | |
811 | slot set to the union type rather than the record type containing | |
812 | the anonymous union. In this case, DECL_FIELD_CONTEXT is correct. */ | |
813 | if (context && TREE_CODE (context) == UNION_TYPE | |
814 | && ANON_AGGRNAME_P (TYPE_IDENTIFIER (context))) | |
815 | context = DECL_FIELD_CONTEXT (field); | |
816 | ||
817 | /* Virtual function tables are never private. But we should know that | |
818 | we are looking for this, and not even try to hide it. */ | |
819 | if (DECL_NAME (field) && VFIELD_NAME_P (DECL_NAME (field)) == 1) | |
820 | PUBLIC_RETURN; | |
821 | ||
822 | /* Member found immediately within object. */ | |
700f8a87 | 823 | if (BINFO_INHERITANCE_CHAIN (basetype_path) == NULL_TREE) |
8d08fdba MS |
824 | { |
825 | /* Are we (or an enclosing scope) friends with the class that has | |
826 | FIELD? */ | |
827 | if (is_friend (context, previous_scope)) | |
828 | PUBLIC_RETURN; | |
829 | ||
830 | /* If it's private, it's private, you letch. */ | |
831 | if (TREE_PRIVATE (field)) | |
832 | PRIVATE_RETURN; | |
833 | ||
834 | /* ARM $11.5. Member functions of a derived class can access the | |
835 | non-static protected members of a base class only through a | |
836 | pointer to the derived class, a reference to it, or an object | |
837 | of it. Also any subsequently derived classes also have | |
838 | access. */ | |
839 | else if (TREE_PROTECTED (field)) | |
840 | { | |
841 | if (current_class_type | |
39211cd5 | 842 | && static_mem |
8d08fdba MS |
843 | && ACCESSIBLY_DERIVED_FROM_P (context, current_class_type)) |
844 | PUBLIC_RETURN; | |
845 | else | |
846 | PROTECTED_RETURN; | |
847 | } | |
848 | else | |
849 | PUBLIC_RETURN; | |
850 | } | |
851 | ||
852 | /* must reverse more than one element */ | |
853 | basetype_path = reverse_path (basetype_path); | |
854 | types = basetype_path; | |
855 | via_protected = 0; | |
856 | access = access_default; | |
700f8a87 MS |
857 | protected_ok = static_mem && current_class_type |
858 | && ACCESSIBLY_DERIVED_FROM_P (BINFO_TYPE (types), current_class_type); | |
8d08fdba MS |
859 | |
860 | while (1) | |
861 | { | |
862 | tree member; | |
863 | tree binfo = types; | |
864 | tree type = BINFO_TYPE (binfo); | |
865 | int private_ok = 0; | |
866 | ||
867 | /* Friends of a class can see protected members of its bases. | |
868 | Note that classes are their own friends. */ | |
869 | if (is_friend (type, previous_scope)) | |
870 | { | |
871 | protected_ok = 1; | |
872 | private_ok = 1; | |
873 | } | |
874 | ||
875 | member = purpose_member (type, DECL_ACCESS (field)); | |
876 | if (member) | |
877 | { | |
878 | access = (enum access_type) TREE_VALUE (member); | |
879 | break; | |
880 | } | |
881 | ||
882 | types = BINFO_INHERITANCE_CHAIN (types); | |
883 | ||
884 | /* If the next type was VIA_PROTECTED, then fields of all remaining | |
885 | classes past that one are *at least* protected. */ | |
886 | if (types) | |
887 | { | |
888 | if (TREE_VIA_PROTECTED (types)) | |
889 | via_protected = 1; | |
890 | else if (! TREE_VIA_PUBLIC (types) && ! private_ok) | |
891 | { | |
892 | access = access_private; | |
893 | break; | |
894 | } | |
895 | } | |
896 | else | |
897 | break; | |
898 | } | |
899 | reverse_path (basetype_path); | |
900 | ||
901 | /* No special visibilities apply. Use normal rules. */ | |
902 | ||
903 | if (access == access_default) | |
904 | { | |
905 | if (is_friend (context, previous_scope)) | |
906 | access = access_public; | |
907 | else if (TREE_PRIVATE (field)) | |
908 | access = access_private; | |
909 | else if (TREE_PROTECTED (field)) | |
910 | access = access_protected; | |
911 | else | |
912 | access = access_public; | |
913 | } | |
914 | ||
915 | if (access == access_public && via_protected) | |
916 | access = access_protected; | |
917 | ||
918 | if (access == access_protected && protected_ok) | |
919 | access = access_public; | |
920 | ||
921 | #if 0 | |
922 | if (access == access_public) | |
923 | DECL_PUBLIC (field) = 1; | |
924 | else if (access == access_protected) | |
925 | DECL_PROTECTED (field) = 1; | |
926 | else if (access == access_private) | |
927 | DECL_PRIVATE (field) = 1; | |
928 | else my_friendly_abort (96); | |
929 | #endif | |
930 | return access; | |
931 | } | |
932 | ||
933 | /* Routine to see if the sub-object denoted by the binfo PARENT can be | |
934 | found as a base class and sub-object of the object denoted by | |
935 | BINFO. This routine relies upon binfos not being shared, except | |
936 | for binfos for virtual bases. */ | |
937 | static int | |
938 | is_subobject_of_p (parent, binfo) | |
939 | tree parent, binfo; | |
940 | { | |
941 | tree binfos = BINFO_BASETYPES (binfo); | |
942 | int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0; | |
943 | ||
944 | if (parent == binfo) | |
945 | return 1; | |
946 | ||
947 | /* Process and/or queue base types. */ | |
948 | for (i = 0; i < n_baselinks; i++) | |
949 | { | |
950 | tree base_binfo = TREE_VEC_ELT (binfos, i); | |
951 | if (TREE_VIA_VIRTUAL (base_binfo)) | |
952 | base_binfo = TYPE_BINFO (BINFO_TYPE (base_binfo)); | |
953 | if (is_subobject_of_p (parent, base_binfo)) | |
954 | return 1; | |
955 | } | |
956 | return 0; | |
957 | } | |
958 | ||
959 | /* See if a one FIELD_DECL hides another. This routine is meant to | |
960 | correspond to ANSI working paper Sept 17, 1992 10p4. The two | |
961 | binfos given are the binfos corresponding to the particular places | |
962 | the FIELD_DECLs are found. This routine relies upon binfos not | |
963 | being shared, except for virtual bases. */ | |
964 | static int | |
965 | hides (hider_binfo, hidee_binfo) | |
966 | tree hider_binfo, hidee_binfo; | |
967 | { | |
968 | /* hider hides hidee, if hider has hidee as a base class and | |
969 | the instance of hidee is a sub-object of hider. The first | |
970 | part is always true is the second part is true. | |
971 | ||
972 | When hider and hidee are the same (two ways to get to the exact | |
973 | same member) we consider either one as hiding the other. */ | |
974 | return is_subobject_of_p (hidee_binfo, hider_binfo); | |
975 | } | |
976 | ||
977 | /* Very similar to lookup_fnfields_1 but it ensures that at least one | |
978 | function was declared inside the class given by TYPE. It really should | |
979 | only return functions that match the given TYPE. */ | |
980 | static int | |
981 | lookup_fnfields_here (type, name) | |
982 | tree type, name; | |
983 | { | |
984 | int index = lookup_fnfields_1 (type, name); | |
985 | tree fndecls; | |
986 | ||
987 | if (index <= 0) | |
988 | return index; | |
989 | fndecls = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (type), index); | |
990 | while (fndecls) | |
991 | { | |
992 | if (TYPE_MAIN_VARIANT (DECL_CLASS_CONTEXT (fndecls)) | |
993 | == TYPE_MAIN_VARIANT (type)) | |
994 | return index; | |
995 | fndecls = TREE_CHAIN (fndecls); | |
996 | } | |
997 | return -1; | |
998 | } | |
999 | ||
1000 | /* Look for a field named NAME in an inheritance lattice dominated by | |
1001 | XBASETYPE. PROTECT is zero if we can avoid computing access | |
1002 | information, otherwise it is 1. WANT_TYPE is 1 when we should only | |
1003 | return TYPE_DECLs, if no TYPE_DECL can be found return NULL_TREE. | |
1004 | ||
1005 | It was not clear what should happen if WANT_TYPE is set, and an | |
1006 | ambiguity is found. At least one use (lookup_name) to not see | |
1007 | the error. */ | |
1008 | tree | |
1009 | lookup_field (xbasetype, name, protect, want_type) | |
1010 | register tree xbasetype, name; | |
1011 | int protect, want_type; | |
1012 | { | |
1013 | int head = 0, tail = 0; | |
1014 | tree rval, rval_binfo = NULL_TREE, rval_binfo_h; | |
1015 | tree type, basetype_chain, basetype_path; | |
1016 | enum access_type this_v = access_default; | |
1017 | tree entry, binfo, binfo_h; | |
1018 | enum access_type own_access = access_default; | |
1019 | int vbase_name_p = VBASE_NAME_P (name); | |
1020 | ||
1021 | /* rval_binfo is the binfo associated with the found member, note, | |
1022 | this can be set with useful information, even when rval is not | |
1023 | set, because it must deal with ALL members, not just non-function | |
1024 | members. It is used for ambiguity checking and the hidden | |
1025 | checks. Whereas rval is only set if a proper (not hidden) | |
1026 | non-function member is found. */ | |
1027 | ||
1028 | /* rval_binfo_h and binfo_h are binfo values used when we perform the | |
1029 | hiding checks, as virtual base classes may not be shared. The strategy | |
1030 | is we always go into the the binfo hierarchy owned by TYPE_BINFO of | |
1031 | virtual base classes, as we cross virtual base class lines. This way | |
1032 | we know that binfo of a virtual base class will always == itself when | |
1033 | found along any line. (mrs) */ | |
1034 | ||
8d08fdba MS |
1035 | char *errstr = 0; |
1036 | ||
1037 | /* Set this to nonzero if we don't know how to compute | |
1038 | accurate error messages for access control. */ | |
1039 | int index = MEMOIZED_HASH_FN (name); | |
1040 | ||
1041 | /* If we are looking for a constructor in a templated type, use the | |
1042 | unspecialized name, as that is how we store it. */ | |
1043 | if (IDENTIFIER_TEMPLATE (name)) | |
1044 | name = constructor_name (name); | |
1045 | ||
1046 | if (TREE_CODE (xbasetype) == TREE_VEC) | |
1047 | { | |
8d08fdba | 1048 | type = BINFO_TYPE (xbasetype); |
39211cd5 | 1049 | basetype_path = xbasetype; |
8d08fdba MS |
1050 | } |
1051 | else if (IS_AGGR_TYPE_CODE (TREE_CODE (xbasetype))) | |
39211cd5 MS |
1052 | { |
1053 | type = xbasetype; | |
1054 | basetype_path = TYPE_BINFO (xbasetype); | |
1055 | BINFO_VIA_PUBLIC (basetype_path) = 1; | |
1056 | BINFO_INHERITANCE_CHAIN (basetype_path) = NULL_TREE; | |
1057 | } | |
8d08fdba MS |
1058 | else my_friendly_abort (97); |
1059 | ||
1060 | if (CLASSTYPE_MTABLE_ENTRY (type)) | |
1061 | { | |
1062 | tree tem = MEMOIZED_FIELDS (CLASSTYPE_MTABLE_ENTRY (type), index); | |
1063 | ||
1064 | while (tem && TREE_PURPOSE (tem) != name) | |
1065 | { | |
1066 | memoized_fields_searched[0]++; | |
1067 | tem = TREE_CHAIN (tem); | |
1068 | } | |
1069 | if (tem) | |
1070 | { | |
1071 | if (protect && TREE_TYPE (tem)) | |
1072 | { | |
1073 | error (TREE_STRING_POINTER (TREE_TYPE (tem)), | |
1074 | IDENTIFIER_POINTER (name), | |
1075 | TYPE_NAME_STRING (DECL_FIELD_CONTEXT (TREE_VALUE (tem)))); | |
1076 | return error_mark_node; | |
1077 | } | |
1078 | if (TREE_VALUE (tem) == NULL_TREE) | |
1079 | memoized_fast_rejects[0] += 1; | |
1080 | else | |
1081 | memoized_fast_finds[0] += 1; | |
1082 | return TREE_VALUE (tem); | |
1083 | } | |
1084 | } | |
1085 | ||
1086 | #ifdef GATHER_STATISTICS | |
1087 | n_calls_lookup_field++; | |
1088 | #endif | |
1089 | if (protect && flag_memoize_lookups && ! global_bindings_p ()) | |
1090 | entry = make_memoized_table_entry (type, name, 0); | |
1091 | else | |
1092 | entry = 0; | |
1093 | ||
1094 | rval = lookup_field_1 (type, name); | |
8d08fdba | 1095 | |
e1cd6e56 | 1096 | if (rval || lookup_fnfields_here (type, name) >= 0) |
8d08fdba | 1097 | { |
e1cd6e56 MS |
1098 | if (rval) |
1099 | { | |
1100 | if (want_type) | |
1101 | { | |
1102 | if (TREE_CODE (rval) != TYPE_DECL) | |
1103 | { | |
1104 | rval = purpose_member (name, CLASSTYPE_TAGS (type)); | |
1105 | if (rval) | |
1106 | rval = TYPE_MAIN_DECL (TREE_VALUE (rval)); | |
1107 | } | |
1108 | } | |
1109 | else | |
1110 | { | |
1111 | if (TREE_CODE (rval) == TYPE_DECL | |
1112 | && lookup_fnfields_here (type, name) >= 0) | |
1113 | rval = NULL_TREE; | |
1114 | } | |
1115 | } | |
1116 | ||
1117 | if (protect && rval) | |
8d08fdba MS |
1118 | { |
1119 | if (TREE_PRIVATE (rval) | TREE_PROTECTED (rval)) | |
1120 | this_v = compute_access (basetype_path, rval); | |
1121 | if (TREE_CODE (rval) == CONST_DECL) | |
1122 | { | |
1123 | if (this_v == access_private) | |
a28e3c7f | 1124 | errstr = "enum `%D' is a private value of class `%T'"; |
8d08fdba | 1125 | else if (this_v == access_protected) |
a28e3c7f | 1126 | errstr = "enum `%D' is a protected value of class `%T'"; |
8d08fdba MS |
1127 | } |
1128 | else | |
1129 | { | |
1130 | if (this_v == access_private) | |
a28e3c7f | 1131 | errstr = "member `%D' is a private member of class `%T'"; |
8d08fdba | 1132 | else if (this_v == access_protected) |
a28e3c7f | 1133 | errstr = "member `%D' is a protected member of class `%T'"; |
8d08fdba MS |
1134 | } |
1135 | } | |
1136 | ||
1137 | if (entry) | |
1138 | { | |
1139 | if (errstr) | |
1140 | { | |
1141 | /* This depends on behavior of lookup_field_1! */ | |
1142 | tree error_string = my_build_string (errstr); | |
1143 | TREE_TYPE (entry) = error_string; | |
1144 | } | |
1145 | else | |
1146 | { | |
1147 | /* Let entry know there is no problem with this access. */ | |
1148 | TREE_TYPE (entry) = NULL_TREE; | |
1149 | } | |
1150 | TREE_VALUE (entry) = rval; | |
1151 | } | |
1152 | ||
1153 | if (errstr && protect) | |
1154 | { | |
a4443a08 | 1155 | cp_error (errstr, name, type); |
8d08fdba MS |
1156 | return error_mark_node; |
1157 | } | |
1158 | return rval; | |
1159 | } | |
1160 | ||
39211cd5 MS |
1161 | basetype_chain = build_tree_list (NULL_TREE, basetype_path); |
1162 | TREE_VIA_PUBLIC (basetype_chain) = TREE_VIA_PUBLIC (basetype_path); | |
1163 | TREE_VIA_PROTECTED (basetype_chain) = TREE_VIA_PROTECTED (basetype_path); | |
1164 | TREE_VIA_VIRTUAL (basetype_chain) = TREE_VIA_VIRTUAL (basetype_path); | |
8d08fdba MS |
1165 | |
1166 | /* The ambiguity check relies upon breadth first searching. */ | |
1167 | ||
1168 | search_stack = push_search_level (search_stack, &search_obstack); | |
8d08fdba MS |
1169 | binfo = basetype_path; |
1170 | binfo_h = binfo; | |
1171 | ||
1172 | while (1) | |
1173 | { | |
1174 | tree binfos = BINFO_BASETYPES (binfo); | |
1175 | int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0; | |
1176 | tree nval; | |
1177 | ||
1178 | /* Process and/or queue base types. */ | |
1179 | for (i = 0; i < n_baselinks; i++) | |
1180 | { | |
1181 | tree base_binfo = TREE_VEC_ELT (binfos, i); | |
1182 | if (BINFO_FIELDS_MARKED (base_binfo) == 0) | |
1183 | { | |
1184 | tree btypes; | |
1185 | ||
1186 | SET_BINFO_FIELDS_MARKED (base_binfo); | |
1187 | btypes = my_tree_cons (NULL_TREE, base_binfo, basetype_chain); | |
1188 | TREE_VIA_PUBLIC (btypes) = TREE_VIA_PUBLIC (base_binfo); | |
1189 | TREE_VIA_PROTECTED (btypes) = TREE_VIA_PROTECTED (base_binfo); | |
1190 | TREE_VIA_VIRTUAL (btypes) = TREE_VIA_VIRTUAL (base_binfo); | |
1191 | if (TREE_VIA_VIRTUAL (base_binfo)) | |
1192 | btypes = tree_cons (NULL_TREE, | |
1193 | TYPE_BINFO (BINFO_TYPE (TREE_VEC_ELT (BINFO_BASETYPES (binfo_h), i))), | |
1194 | btypes); | |
1195 | else | |
1196 | btypes = tree_cons (NULL_TREE, | |
1197 | TREE_VEC_ELT (BINFO_BASETYPES (binfo_h), i), | |
1198 | btypes); | |
1199 | obstack_ptr_grow (&search_obstack, btypes); | |
1200 | tail += 1; | |
1201 | if (tail >= search_stack->limit) | |
1202 | my_friendly_abort (98); | |
1203 | } | |
1204 | } | |
1205 | ||
1206 | /* Process head of queue, if one exists. */ | |
1207 | if (head >= tail) | |
1208 | break; | |
1209 | ||
1210 | basetype_chain = search_stack->first[head++]; | |
1211 | binfo_h = TREE_VALUE (basetype_chain); | |
1212 | basetype_chain = TREE_CHAIN (basetype_chain); | |
1213 | basetype_path = TREE_VALUE (basetype_chain); | |
1214 | if (TREE_CHAIN (basetype_chain)) | |
1215 | BINFO_INHERITANCE_CHAIN (basetype_path) = TREE_VALUE (TREE_CHAIN (basetype_chain)); | |
1216 | else | |
1217 | BINFO_INHERITANCE_CHAIN (basetype_path) = NULL_TREE; | |
1218 | ||
1219 | binfo = basetype_path; | |
1220 | type = BINFO_TYPE (binfo); | |
1221 | ||
1222 | /* See if we can find NAME in TYPE. If RVAL is nonzero, | |
1223 | and we do find NAME in TYPE, verify that such a second | |
59be0cdd | 1224 | sighting is in fact valid. */ |
8d08fdba MS |
1225 | |
1226 | nval = lookup_field_1 (type, name); | |
1227 | ||
1228 | if (nval || lookup_fnfields_here (type, name)>=0) | |
1229 | { | |
700f8a87 MS |
1230 | if (nval && nval == rval && SHARED_MEMBER_P (nval)) |
1231 | { | |
1232 | /* This is ok, the member found is the same [class.ambig] */ | |
1233 | } | |
1234 | else if (rval_binfo && hides (rval_binfo_h, binfo_h)) | |
8d08fdba MS |
1235 | { |
1236 | /* This is ok, the member found is in rval_binfo, not | |
1237 | here (binfo). */ | |
1238 | } | |
1239 | else if (rval_binfo==NULL_TREE || hides (binfo_h, rval_binfo_h)) | |
1240 | { | |
1241 | /* This is ok, the member found is here (binfo), not in | |
1242 | rval_binfo. */ | |
1243 | if (nval) | |
1244 | { | |
1245 | rval = nval; | |
1246 | if (entry || protect) | |
1247 | this_v = compute_access (basetype_path, rval); | |
1248 | /* These may look ambiguous, but they really are not. */ | |
1249 | if (vbase_name_p) | |
1250 | break; | |
1251 | } | |
1252 | else | |
1253 | { | |
1254 | /* Undo finding it before, as something else hides it. */ | |
1255 | rval = NULL_TREE; | |
1256 | } | |
1257 | rval_binfo = binfo; | |
1258 | rval_binfo_h = binfo_h; | |
1259 | } | |
1260 | else | |
1261 | { | |
1262 | /* This is ambiguous. */ | |
a28e3c7f | 1263 | errstr = "request for member `%D' is ambiguous"; |
8d08fdba MS |
1264 | protect = 2; |
1265 | break; | |
1266 | } | |
1267 | } | |
1268 | } | |
1269 | { | |
1270 | tree *tp = search_stack->first; | |
1271 | tree *search_tail = tp + tail; | |
1272 | ||
1273 | if (entry) | |
1274 | TREE_VALUE (entry) = rval; | |
1275 | ||
e1cd6e56 | 1276 | if (rval_binfo) |
8d08fdba | 1277 | { |
e1cd6e56 MS |
1278 | type = BINFO_TYPE (rval_binfo); |
1279 | ||
1280 | if (rval) | |
1281 | { | |
1282 | if (want_type) | |
1283 | { | |
1284 | if (TREE_CODE (rval) != TYPE_DECL) | |
1285 | { | |
1286 | rval = purpose_member (name, CLASSTYPE_TAGS (type)); | |
1287 | if (rval) | |
1288 | rval = TYPE_MAIN_DECL (TREE_VALUE (rval)); | |
1289 | } | |
1290 | } | |
1291 | else | |
1292 | { | |
1293 | if (TREE_CODE (rval) == TYPE_DECL | |
1294 | && lookup_fnfields_here (type, name) >= 0) | |
1295 | rval = NULL_TREE; | |
1296 | } | |
1297 | } | |
8d08fdba MS |
1298 | } |
1299 | ||
e1cd6e56 MS |
1300 | if (rval == NULL_TREE) |
1301 | errstr = 0; | |
1302 | ||
8d08fdba MS |
1303 | /* If this FIELD_DECL defines its own access level, deal with that. */ |
1304 | if (rval && errstr == 0 | |
1305 | && ((protect&1) || entry) | |
1306 | && DECL_LANG_SPECIFIC (rval) | |
1307 | && DECL_ACCESS (rval)) | |
1308 | { | |
1309 | while (tp < search_tail) | |
1310 | { | |
1311 | /* If is possible for one of the derived types on the path to | |
1312 | have defined special access for this field. Look for such | |
1313 | declarations and report an error if a conflict is found. */ | |
1314 | enum access_type new_v; | |
1315 | ||
1316 | if (this_v != access_default) | |
1317 | new_v = compute_access (TREE_VALUE (TREE_CHAIN (*tp)), rval); | |
1318 | if (this_v != access_default && new_v != this_v) | |
1319 | { | |
a28e3c7f | 1320 | errstr = "conflicting access to member `%D'"; |
8d08fdba MS |
1321 | this_v = access_default; |
1322 | } | |
1323 | own_access = new_v; | |
1324 | CLEAR_BINFO_FIELDS_MARKED (TREE_VALUE (TREE_CHAIN (*tp))); | |
1325 | tp += 1; | |
1326 | } | |
1327 | } | |
1328 | else | |
1329 | { | |
1330 | while (tp < search_tail) | |
1331 | { | |
1332 | CLEAR_BINFO_FIELDS_MARKED (TREE_VALUE (TREE_CHAIN (*tp))); | |
1333 | tp += 1; | |
1334 | } | |
1335 | } | |
1336 | } | |
1337 | search_stack = pop_search_level (search_stack); | |
1338 | ||
1339 | if (errstr == 0) | |
1340 | { | |
1341 | if (own_access == access_private) | |
a28e3c7f | 1342 | errstr = "member `%D' declared private"; |
8d08fdba | 1343 | else if (own_access == access_protected) |
a28e3c7f | 1344 | errstr = "member `%D' declared protected"; |
8d08fdba MS |
1345 | else if (this_v == access_private) |
1346 | errstr = TREE_PRIVATE (rval) | |
a28e3c7f MS |
1347 | ? "member `%D' is private" |
1348 | : "member `%D' is from private base class"; | |
8d08fdba MS |
1349 | else if (this_v == access_protected) |
1350 | errstr = TREE_PROTECTED (rval) | |
a28e3c7f MS |
1351 | ? "member `%D' is protected" |
1352 | : "member `%D' is from protected base class"; | |
8d08fdba MS |
1353 | } |
1354 | ||
1355 | if (entry) | |
1356 | { | |
1357 | if (errstr) | |
1358 | { | |
1359 | tree error_string = my_build_string (errstr); | |
1360 | /* Save error message with entry. */ | |
1361 | TREE_TYPE (entry) = error_string; | |
1362 | } | |
1363 | else | |
1364 | { | |
1365 | /* Mark entry as having no error string. */ | |
1366 | TREE_TYPE (entry) = NULL_TREE; | |
1367 | } | |
1368 | } | |
1369 | ||
1370 | if (errstr && protect) | |
1371 | { | |
a28e3c7f | 1372 | cp_error (errstr, name, type); |
8d08fdba MS |
1373 | rval = error_mark_node; |
1374 | } | |
1375 | return rval; | |
1376 | } | |
1377 | ||
1378 | /* Try to find NAME inside a nested class. */ | |
1379 | tree | |
1380 | lookup_nested_field (name, complain) | |
1381 | tree name; | |
1382 | int complain; | |
1383 | { | |
1384 | register tree t; | |
1385 | ||
1386 | tree id = NULL_TREE; | |
1387 | if (TREE_CHAIN (current_class_type)) | |
1388 | { | |
1389 | /* Climb our way up the nested ladder, seeing if we're trying to | |
1390 | modify a field in an enclosing class. If so, we should only | |
1391 | be able to modify if it's static. */ | |
1392 | for (t = TREE_CHAIN (current_class_type); | |
1393 | t && DECL_CONTEXT (t); | |
1394 | t = TREE_CHAIN (DECL_CONTEXT (t))) | |
1395 | { | |
1396 | if (TREE_CODE (DECL_CONTEXT (t)) != RECORD_TYPE) | |
1397 | break; | |
1398 | ||
1399 | /* N.B.: lookup_field will do the access checking for us */ | |
1400 | id = lookup_field (DECL_CONTEXT (t), name, complain, 0); | |
1401 | if (id == error_mark_node) | |
1402 | { | |
1403 | id = NULL_TREE; | |
1404 | continue; | |
1405 | } | |
1406 | ||
1407 | if (id != NULL_TREE) | |
1408 | { | |
1409 | if (TREE_CODE (id) == FIELD_DECL | |
1410 | && ! TREE_STATIC (id) | |
1411 | && TREE_TYPE (id) != error_mark_node) | |
1412 | { | |
1413 | if (complain) | |
1414 | { | |
1415 | /* At parse time, we don't want to give this error, since | |
1416 | we won't have enough state to make this kind of | |
1417 | decision properly. But there are times (e.g., with | |
1418 | enums in nested classes) when we do need to call | |
1419 | this fn at parse time. So, in those cases, we pass | |
1420 | complain as a 0 and just return a NULL_TREE. */ | |
1421 | error ("assignment to non-static member `%s' of enclosing class `%s'", | |
1422 | lang_printable_name (id), | |
1423 | IDENTIFIER_POINTER (TYPE_IDENTIFIER | |
1424 | (DECL_CONTEXT (t)))); | |
1425 | /* Mark this for do_identifier(). It would otherwise | |
1426 | claim that the variable was undeclared. */ | |
1427 | TREE_TYPE (id) = error_mark_node; | |
1428 | } | |
1429 | else | |
1430 | { | |
1431 | id = NULL_TREE; | |
1432 | continue; | |
1433 | } | |
1434 | } | |
1435 | break; | |
1436 | } | |
1437 | } | |
1438 | } | |
1439 | ||
1440 | return id; | |
1441 | } | |
1442 | ||
1443 | /* TYPE is a class type. Return the index of the fields within | |
1444 | the method vector with name NAME, or -1 is no such field exists. */ | |
1445 | static int | |
1446 | lookup_fnfields_1 (type, name) | |
1447 | tree type, name; | |
1448 | { | |
1449 | register tree method_vec = CLASSTYPE_METHOD_VEC (type); | |
1450 | ||
1451 | if (method_vec != 0) | |
1452 | { | |
1453 | register tree *methods = &TREE_VEC_ELT (method_vec, 0); | |
1454 | register tree *end = TREE_VEC_END (method_vec); | |
1455 | ||
1456 | #ifdef GATHER_STATISTICS | |
1457 | n_calls_lookup_fnfields_1++; | |
1458 | #endif | |
1459 | if (*methods && name == constructor_name (type)) | |
1460 | return 0; | |
1461 | ||
1462 | while (++methods != end) | |
1463 | { | |
1464 | #ifdef GATHER_STATISTICS | |
1465 | n_outer_fields_searched++; | |
1466 | #endif | |
1467 | if (DECL_NAME (*methods) == name) | |
1468 | break; | |
1469 | } | |
1470 | if (methods != end) | |
1471 | return methods - &TREE_VEC_ELT (method_vec, 0); | |
1472 | } | |
1473 | ||
1474 | return -1; | |
1475 | } | |
1476 | ||
1477 | /* Starting from BASETYPE, return a TREE_BASELINK-like object | |
1478 | which gives the following information (in a list): | |
1479 | ||
1480 | TREE_TYPE: list of basetypes needed to get to... | |
1481 | TREE_VALUE: list of all functions in of given type | |
1482 | which have name NAME. | |
1483 | ||
1484 | No access information is computed by this function, | |
1485 | other then to adorn the list of basetypes with | |
1486 | TREE_VIA_PUBLIC. | |
1487 | ||
1488 | If there are two ways to find a name (two members), if COMPLAIN is | |
1489 | non-zero, then error_mark_node is returned, and an error message is | |
1490 | printed, otherwise, just an error_mark_node is returned. | |
1491 | ||
1492 | As a special case, is COMPLAIN is -1, we don't complain, and we | |
1493 | don't return error_mark_node, but rather the complete list of | |
1494 | virtuals. This is used by get_virtuals_named_this. */ | |
1495 | tree | |
1496 | lookup_fnfields (basetype_path, name, complain) | |
1497 | tree basetype_path, name; | |
1498 | int complain; | |
1499 | { | |
1500 | int head = 0, tail = 0; | |
1501 | tree type, rval, rval_binfo = NULL_TREE, rvals = NULL_TREE, rval_binfo_h; | |
1502 | tree entry, binfo, basetype_chain, binfo_h; | |
1503 | int find_all = 0; | |
1504 | ||
1505 | /* rval_binfo is the binfo associated with the found member, note, | |
1506 | this can be set with useful information, even when rval is not | |
1507 | set, because it must deal with ALL members, not just function | |
1508 | members. It is used for ambiguity checking and the hidden | |
1509 | checks. Whereas rval is only set if a proper (not hidden) | |
1510 | function member is found. */ | |
1511 | ||
1512 | /* rval_binfo_h and binfo_h are binfo values used when we perform the | |
1513 | hiding checks, as virtual base classes may not be shared. The strategy | |
1514 | is we always go into the the binfo hierarchy owned by TYPE_BINFO of | |
1515 | virtual base classes, as we cross virtual base class lines. This way | |
1516 | we know that binfo of a virtual base class will always == itself when | |
1517 | found along any line. (mrs) */ | |
1518 | ||
1519 | /* For now, don't try this. */ | |
1520 | int protect = complain; | |
1521 | ||
8d08fdba MS |
1522 | char *errstr = 0; |
1523 | ||
1524 | /* Set this to nonzero if we don't know how to compute | |
1525 | accurate error messages for access control. */ | |
1526 | int index = MEMOIZED_HASH_FN (name); | |
1527 | ||
1528 | if (complain == -1) | |
1529 | { | |
1530 | find_all = 1; | |
1531 | protect = complain = 0; | |
1532 | } | |
1533 | ||
1534 | /* If we are looking for a constructor in a templated type, use the | |
1535 | unspecialized name, as that is how we store it. */ | |
1536 | if (IDENTIFIER_TEMPLATE (name)) | |
1537 | name = constructor_name (name); | |
1538 | ||
1539 | binfo = basetype_path; | |
1540 | binfo_h = binfo; | |
1541 | type = BINFO_TYPE (basetype_path); | |
1542 | ||
1543 | /* The memoization code is in need of maintenance. */ | |
1544 | if (!find_all && CLASSTYPE_MTABLE_ENTRY (type)) | |
1545 | { | |
1546 | tree tem = MEMOIZED_FNFIELDS (CLASSTYPE_MTABLE_ENTRY (type), index); | |
1547 | ||
1548 | while (tem && TREE_PURPOSE (tem) != name) | |
1549 | { | |
1550 | memoized_fields_searched[1]++; | |
1551 | tem = TREE_CHAIN (tem); | |
1552 | } | |
1553 | if (tem) | |
1554 | { | |
1555 | if (protect && TREE_TYPE (tem)) | |
1556 | { | |
1557 | error (TREE_STRING_POINTER (TREE_TYPE (tem)), | |
1558 | IDENTIFIER_POINTER (name), | |
1559 | TYPE_NAME_STRING (DECL_CLASS_CONTEXT (TREE_VALUE (TREE_VALUE (tem))))); | |
1560 | return error_mark_node; | |
1561 | } | |
1562 | if (TREE_VALUE (tem) == NULL_TREE) | |
1563 | { | |
1564 | memoized_fast_rejects[1] += 1; | |
1565 | return NULL_TREE; | |
1566 | } | |
1567 | else | |
1568 | { | |
1569 | /* Want to return this, but we must make sure | |
1570 | that access information is consistent. */ | |
1571 | tree baselink = TREE_VALUE (tem); | |
1572 | tree memoized_basetypes = TREE_PURPOSE (baselink); | |
1573 | tree these_basetypes = basetype_path; | |
1574 | while (memoized_basetypes && these_basetypes) | |
1575 | { | |
1576 | memoized_fields_searched[1]++; | |
1577 | if (TREE_VALUE (memoized_basetypes) != these_basetypes) | |
1578 | break; | |
1579 | memoized_basetypes = TREE_CHAIN (memoized_basetypes); | |
1580 | these_basetypes = BINFO_INHERITANCE_CHAIN (these_basetypes); | |
1581 | } | |
1582 | /* The following statement is true only when both are NULL. */ | |
1583 | if (memoized_basetypes == these_basetypes) | |
1584 | { | |
1585 | memoized_fast_finds[1] += 1; | |
1586 | return TREE_VALUE (tem); | |
1587 | } | |
1588 | /* else, we must re-find this field by hand. */ | |
1589 | baselink = tree_cons (basetype_path, TREE_VALUE (baselink), TREE_CHAIN (baselink)); | |
1590 | return baselink; | |
1591 | } | |
1592 | } | |
1593 | } | |
1594 | ||
1595 | #ifdef GATHER_STATISTICS | |
1596 | n_calls_lookup_fnfields++; | |
1597 | #endif | |
1598 | if (protect && flag_memoize_lookups && ! global_bindings_p ()) | |
1599 | entry = make_memoized_table_entry (type, name, 1); | |
1600 | else | |
1601 | entry = 0; | |
1602 | ||
1603 | index = lookup_fnfields_here (type, name); | |
1604 | if (index >= 0 || lookup_field_1 (type, name)) | |
1605 | { | |
1606 | rval_binfo = basetype_path; | |
1607 | rval_binfo_h = rval_binfo; | |
1608 | } | |
1609 | ||
1610 | if (index >= 0) | |
1611 | { | |
1612 | rval = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (type), index); | |
1613 | rvals = my_tree_cons (basetype_path, rval, rvals); | |
1614 | if (BINFO_BASETYPES (binfo) && CLASSTYPE_BASELINK_VEC (type)) | |
1615 | TREE_TYPE (rvals) = TREE_VEC_ELT (CLASSTYPE_BASELINK_VEC (type), index); | |
1616 | ||
1617 | if (entry) | |
1618 | { | |
1619 | TREE_VALUE (entry) = rvals; | |
1620 | TREE_TYPE (entry) = NULL_TREE; | |
1621 | } | |
1622 | ||
8d08fdba MS |
1623 | return rvals; |
1624 | } | |
1625 | rval = NULL_TREE; | |
1626 | ||
39211cd5 MS |
1627 | if (basetype_path == TYPE_BINFO (type)) |
1628 | { | |
1629 | basetype_chain = CLASSTYPE_BINFO_AS_LIST (type); | |
1630 | TREE_VIA_PUBLIC (basetype_chain) = 1; | |
1631 | BINFO_VIA_PUBLIC (basetype_path) = 1; | |
1632 | BINFO_INHERITANCE_CHAIN (basetype_path) = NULL_TREE; | |
1633 | } | |
1634 | else | |
1635 | { | |
1636 | basetype_chain = build_tree_list (NULL_TREE, basetype_path); | |
1637 | TREE_VIA_PUBLIC (basetype_chain) = TREE_VIA_PUBLIC (basetype_path); | |
1638 | TREE_VIA_PROTECTED (basetype_chain) = TREE_VIA_PROTECTED (basetype_path); | |
1639 | TREE_VIA_VIRTUAL (basetype_chain) = TREE_VIA_VIRTUAL (basetype_path); | |
1640 | } | |
8d08fdba MS |
1641 | |
1642 | /* The ambiguity check relies upon breadth first searching. */ | |
1643 | ||
1644 | search_stack = push_search_level (search_stack, &search_obstack); | |
8d08fdba MS |
1645 | binfo = basetype_path; |
1646 | binfo_h = binfo; | |
1647 | ||
1648 | while (1) | |
1649 | { | |
1650 | tree binfos = BINFO_BASETYPES (binfo); | |
1651 | int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0; | |
1652 | int index; | |
1653 | ||
1654 | /* Process and/or queue base types. */ | |
1655 | for (i = 0; i < n_baselinks; i++) | |
1656 | { | |
1657 | tree base_binfo = TREE_VEC_ELT (binfos, i); | |
1658 | if (BINFO_FIELDS_MARKED (base_binfo) == 0) | |
1659 | { | |
1660 | tree btypes; | |
1661 | ||
1662 | SET_BINFO_FIELDS_MARKED (base_binfo); | |
1663 | btypes = my_tree_cons (NULL_TREE, base_binfo, basetype_chain); | |
1664 | TREE_VIA_PUBLIC (btypes) = TREE_VIA_PUBLIC (base_binfo); | |
1665 | TREE_VIA_PROTECTED (btypes) = TREE_VIA_PROTECTED (base_binfo); | |
1666 | TREE_VIA_VIRTUAL (btypes) = TREE_VIA_VIRTUAL (base_binfo); | |
1667 | if (TREE_VIA_VIRTUAL (base_binfo)) | |
1668 | btypes = tree_cons (NULL_TREE, | |
1669 | TYPE_BINFO (BINFO_TYPE (TREE_VEC_ELT (BINFO_BASETYPES (binfo_h), i))), | |
1670 | btypes); | |
1671 | else | |
1672 | btypes = tree_cons (NULL_TREE, | |
1673 | TREE_VEC_ELT (BINFO_BASETYPES (binfo_h), i), | |
1674 | btypes); | |
1675 | obstack_ptr_grow (&search_obstack, btypes); | |
1676 | tail += 1; | |
1677 | if (tail >= search_stack->limit) | |
1678 | my_friendly_abort (99); | |
1679 | } | |
1680 | } | |
1681 | ||
1682 | /* Process head of queue, if one exists. */ | |
1683 | if (head >= tail) | |
1684 | break; | |
1685 | ||
1686 | basetype_chain = search_stack->first[head++]; | |
1687 | binfo_h = TREE_VALUE (basetype_chain); | |
1688 | basetype_chain = TREE_CHAIN (basetype_chain); | |
1689 | basetype_path = TREE_VALUE (basetype_chain); | |
1690 | if (TREE_CHAIN (basetype_chain)) | |
1691 | BINFO_INHERITANCE_CHAIN (basetype_path) = TREE_VALUE (TREE_CHAIN (basetype_chain)); | |
1692 | else | |
1693 | BINFO_INHERITANCE_CHAIN (basetype_path) = NULL_TREE; | |
1694 | ||
1695 | binfo = basetype_path; | |
1696 | type = BINFO_TYPE (binfo); | |
1697 | ||
1698 | /* See if we can find NAME in TYPE. If RVAL is nonzero, | |
1699 | and we do find NAME in TYPE, verify that such a second | |
59be0cdd | 1700 | sighting is in fact valid. */ |
8d08fdba MS |
1701 | |
1702 | index = lookup_fnfields_here (type, name); | |
1703 | ||
1704 | if (index >= 0 || (lookup_field_1 (type, name)!=NULL_TREE && !find_all)) | |
1705 | { | |
1706 | if (rval_binfo && !find_all && hides (rval_binfo_h, binfo_h)) | |
1707 | { | |
1708 | /* This is ok, the member found is in rval_binfo, not | |
1709 | here (binfo). */ | |
1710 | } | |
1711 | else if (rval_binfo==NULL_TREE || find_all || hides (binfo_h, rval_binfo_h)) | |
1712 | { | |
1713 | /* This is ok, the member found is here (binfo), not in | |
1714 | rval_binfo. */ | |
1715 | if (index >= 0) | |
1716 | { | |
1717 | rval = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (type), index); | |
1718 | /* Note, rvals can only be previously set if find_all is | |
1719 | true. */ | |
1720 | rvals = my_tree_cons (basetype_path, rval, rvals); | |
1721 | if (TYPE_BINFO_BASETYPES (type) | |
1722 | && CLASSTYPE_BASELINK_VEC (type)) | |
1723 | TREE_TYPE (rvals) = TREE_VEC_ELT (CLASSTYPE_BASELINK_VEC (type), index); | |
1724 | } | |
1725 | else | |
1726 | { | |
1727 | /* Undo finding it before, as something else hides it. */ | |
1728 | rval = NULL_TREE; | |
1729 | rvals = NULL_TREE; | |
1730 | } | |
1731 | rval_binfo = binfo; | |
1732 | rval_binfo_h = binfo_h; | |
1733 | } | |
1734 | else | |
1735 | { | |
1736 | /* This is ambiguous. */ | |
700f8a87 | 1737 | errstr = "request for method `%D' is ambiguous"; |
8d08fdba MS |
1738 | rvals = error_mark_node; |
1739 | break; | |
1740 | } | |
1741 | } | |
1742 | } | |
1743 | { | |
1744 | tree *tp = search_stack->first; | |
1745 | tree *search_tail = tp + tail; | |
1746 | ||
1747 | while (tp < search_tail) | |
1748 | { | |
1749 | CLEAR_BINFO_FIELDS_MARKED (TREE_VALUE (TREE_CHAIN (*tp))); | |
1750 | tp += 1; | |
1751 | } | |
1752 | } | |
1753 | search_stack = pop_search_level (search_stack); | |
1754 | ||
1755 | if (entry) | |
1756 | { | |
1757 | if (errstr) | |
1758 | { | |
1759 | tree error_string = my_build_string (errstr); | |
1760 | /* Save error message with entry. */ | |
1761 | TREE_TYPE (entry) = error_string; | |
1762 | } | |
1763 | else | |
1764 | { | |
1765 | /* Mark entry as having no error string. */ | |
1766 | TREE_TYPE (entry) = NULL_TREE; | |
1767 | TREE_VALUE (entry) = rvals; | |
1768 | } | |
1769 | } | |
1770 | ||
1771 | if (errstr && protect) | |
1772 | { | |
700f8a87 | 1773 | cp_error (errstr, name); |
8d08fdba MS |
1774 | rvals = error_mark_node; |
1775 | } | |
1776 | ||
1777 | return rvals; | |
1778 | } | |
1779 | \f | |
1780 | /* BREADTH-FIRST SEARCH ROUTINES. */ | |
1781 | ||
1782 | /* Search a multiple inheritance hierarchy by breadth-first search. | |
1783 | ||
1784 | TYPE is an aggregate type, possibly in a multiple-inheritance hierarchy. | |
1785 | TESTFN is a function, which, if true, means that our condition has been met, | |
1786 | and its return value should be returned. | |
1787 | QFN, if non-NULL, is a predicate dictating whether the type should | |
1788 | even be queued. */ | |
1789 | ||
1790 | HOST_WIDE_INT | |
1791 | breadth_first_search (binfo, testfn, qfn) | |
1792 | tree binfo; | |
1793 | int (*testfn)(); | |
1794 | int (*qfn)(); | |
1795 | { | |
1796 | int head = 0, tail = 0; | |
1797 | int rval = 0; | |
1798 | ||
1799 | search_stack = push_search_level (search_stack, &search_obstack); | |
1800 | ||
1801 | while (1) | |
1802 | { | |
1803 | tree binfos = BINFO_BASETYPES (binfo); | |
1804 | int n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0; | |
1805 | int i; | |
1806 | ||
1807 | /* Process and/or queue base types. */ | |
1808 | for (i = 0; i < n_baselinks; i++) | |
1809 | { | |
1810 | tree base_binfo = TREE_VEC_ELT (binfos, i); | |
1811 | ||
1812 | if (BINFO_MARKED (base_binfo) == 0 | |
1813 | && (qfn == 0 || (*qfn) (binfo, i))) | |
1814 | { | |
1815 | SET_BINFO_MARKED (base_binfo); | |
1816 | obstack_ptr_grow (&search_obstack, binfo); | |
1817 | obstack_ptr_grow (&search_obstack, (HOST_WIDE_INT) i); | |
1818 | tail += 2; | |
1819 | if (tail >= search_stack->limit) | |
1820 | my_friendly_abort (100); | |
1821 | } | |
1822 | } | |
1823 | /* Process head of queue, if one exists. */ | |
1824 | if (head >= tail) | |
1825 | { | |
1826 | rval = 0; | |
1827 | break; | |
1828 | } | |
1829 | ||
1830 | binfo = search_stack->first[head++]; | |
1831 | i = (HOST_WIDE_INT) search_stack->first[head++]; | |
1832 | if (rval = (*testfn) (binfo, i)) | |
1833 | break; | |
1834 | binfo = BINFO_BASETYPE (binfo, i); | |
1835 | } | |
1836 | { | |
1837 | tree *tp = search_stack->first; | |
1838 | tree *search_tail = tp + tail; | |
1839 | while (tp < search_tail) | |
1840 | { | |
1841 | tree binfo = *tp++; | |
1842 | int i = (HOST_WIDE_INT)(*tp++); | |
1843 | CLEAR_BINFO_MARKED (BINFO_BASETYPE (binfo, i)); | |
1844 | } | |
1845 | } | |
1846 | ||
1847 | search_stack = pop_search_level (search_stack); | |
1848 | return rval; | |
1849 | } | |
1850 | ||
1851 | /* Functions to use in breadth first searches. */ | |
1852 | typedef tree (*pft)(); | |
1853 | typedef int (*pfi)(); | |
1854 | ||
1855 | int tree_needs_constructor_p (binfo, i) | |
1856 | tree binfo; | |
1857 | int i; | |
1858 | { | |
1859 | tree basetype; | |
1860 | my_friendly_assert (i != 0, 296); | |
1861 | basetype = BINFO_TYPE (BINFO_BASETYPE (binfo, i)); | |
1862 | return TYPE_NEEDS_CONSTRUCTING (basetype); | |
1863 | } | |
1864 | ||
1865 | static tree declarator; | |
1866 | ||
1867 | static tree | |
1868 | get_virtuals_named_this (binfo) | |
1869 | tree binfo; | |
1870 | { | |
1871 | tree fields; | |
1872 | ||
1873 | fields = lookup_fnfields (binfo, declarator, -1); | |
1874 | /* fields cannot be error_mark_node */ | |
1875 | ||
1876 | if (fields == 0) | |
1877 | return 0; | |
1878 | ||
1879 | /* Get to the function decls, and return the first virtual function | |
1880 | with this name, if there is one. */ | |
1881 | while (fields) | |
1882 | { | |
1883 | tree fndecl; | |
1884 | ||
1885 | for (fndecl = TREE_VALUE (fields); fndecl; fndecl = DECL_CHAIN (fndecl)) | |
1886 | if (DECL_VINDEX (fndecl)) | |
1887 | return fields; | |
1888 | fields = next_baselink (fields); | |
1889 | } | |
1890 | return NULL_TREE; | |
1891 | } | |
1892 | ||
1893 | static tree get_virtual_destructor (binfo, i) | |
1894 | tree binfo; | |
1895 | int i; | |
1896 | { | |
1897 | tree type = BINFO_TYPE (binfo); | |
1898 | if (i >= 0) | |
1899 | type = BINFO_TYPE (TREE_VEC_ELT (BINFO_BASETYPES (binfo), i)); | |
1900 | if (TYPE_HAS_DESTRUCTOR (type) | |
1901 | && DECL_VINDEX (TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (type), 0))) | |
1902 | return TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (type), 0); | |
1903 | return 0; | |
1904 | } | |
1905 | ||
1906 | int tree_has_any_destructor_p (binfo, i) | |
1907 | tree binfo; | |
1908 | int i; | |
1909 | { | |
1910 | tree type = BINFO_TYPE (binfo); | |
1911 | if (i >= 0) | |
1912 | type = BINFO_TYPE (TREE_VEC_ELT (BINFO_BASETYPES (binfo), i)); | |
1913 | return TYPE_NEEDS_DESTRUCTOR (type); | |
1914 | } | |
1915 | ||
7177d104 MS |
1916 | /* Given a class type TYPE, and a function decl FNDECL, look for a |
1917 | virtual function in TYPE's hierarchy which FNDECL could match as a | |
1918 | virtual function. It doesn't matter which one we find. | |
8d08fdba MS |
1919 | |
1920 | DTORP is nonzero if we are looking for a destructor. Destructors | |
1921 | need special treatment because they do not match by name. */ | |
1922 | tree | |
7177d104 | 1923 | get_matching_virtual (binfo, fndecl, dtorp) |
8d08fdba MS |
1924 | tree binfo, fndecl; |
1925 | int dtorp; | |
1926 | { | |
1927 | tree tmp = NULL_TREE; | |
1928 | ||
1929 | /* Breadth first search routines start searching basetypes | |
1930 | of TYPE, so we must perform first ply of search here. */ | |
1931 | if (dtorp) | |
1932 | { | |
1933 | if (tree_has_any_destructor_p (binfo, -1)) | |
1934 | tmp = get_virtual_destructor (binfo, -1); | |
1935 | ||
1936 | if (tmp) | |
7177d104 | 1937 | return tmp; |
8d08fdba MS |
1938 | |
1939 | tmp = (tree) breadth_first_search (binfo, | |
1940 | (pfi) get_virtual_destructor, | |
1941 | tree_has_any_destructor_p); | |
8d08fdba MS |
1942 | return tmp; |
1943 | } | |
1944 | else | |
1945 | { | |
1946 | tree drettype, dtypes, btypes, instptr_type; | |
1947 | tree basetype = DECL_CLASS_CONTEXT (fndecl); | |
1948 | tree baselink, best = NULL_TREE; | |
1949 | tree name = DECL_ASSEMBLER_NAME (fndecl); | |
1950 | ||
1951 | declarator = DECL_NAME (fndecl); | |
1952 | if (IDENTIFIER_VIRTUAL_P (declarator) == 0) | |
1953 | return NULL_TREE; | |
1954 | ||
a292b002 MS |
1955 | baselink = get_virtuals_named_this (binfo); |
1956 | if (baselink == NULL_TREE) | |
1957 | return NULL_TREE; | |
1958 | ||
8d08fdba MS |
1959 | drettype = TREE_TYPE (TREE_TYPE (fndecl)); |
1960 | dtypes = TYPE_ARG_TYPES (TREE_TYPE (fndecl)); | |
1961 | if (DECL_STATIC_FUNCTION_P (fndecl)) | |
1962 | instptr_type = NULL_TREE; | |
1963 | else | |
1964 | instptr_type = TREE_TYPE (TREE_VALUE (dtypes)); | |
1965 | ||
a292b002 | 1966 | for (; baselink; baselink = next_baselink (baselink)) |
8d08fdba MS |
1967 | { |
1968 | for (tmp = TREE_VALUE (baselink); tmp; tmp = DECL_CHAIN (tmp)) | |
1969 | { | |
1970 | if (! DECL_VINDEX (tmp)) | |
1971 | continue; | |
1972 | ||
1973 | btypes = TYPE_ARG_TYPES (TREE_TYPE (tmp)); | |
1974 | if (instptr_type == NULL_TREE) | |
1975 | { | |
1976 | if (compparms (TREE_CHAIN (btypes), dtypes, 3)) | |
1977 | /* Caller knows to give error in this case. */ | |
1978 | return tmp; | |
1979 | return NULL_TREE; | |
1980 | } | |
1981 | ||
1982 | if ((TYPE_READONLY (TREE_TYPE (TREE_VALUE (btypes))) | |
1983 | == TYPE_READONLY (instptr_type)) | |
1984 | && compparms (TREE_CHAIN (btypes), TREE_CHAIN (dtypes), 3)) | |
1985 | { | |
e1cd6e56 MS |
1986 | tree brettype = TREE_TYPE (TREE_TYPE (tmp)); |
1987 | if (comptypes (brettype, drettype, 1)) | |
1988 | /* OK */; | |
1989 | else if | |
1990 | (TREE_CODE (brettype) == TREE_CODE (drettype) | |
1991 | && (TREE_CODE (brettype) == POINTER_TYPE | |
1992 | || TREE_CODE (brettype) == REFERENCE_TYPE) | |
1993 | && comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (brettype)), | |
1994 | TYPE_MAIN_VARIANT (TREE_TYPE (drettype)), | |
1995 | 0)) | |
1996 | /* covariant return type */ | |
1997 | { | |
1998 | tree b = TREE_TYPE (brettype), d = TREE_TYPE (drettype); | |
1999 | if (TYPE_MAIN_VARIANT (b) != TYPE_MAIN_VARIANT (d)) | |
2000 | { | |
2001 | tree binfo = get_binfo (b, d, 1); | |
2002 | if (binfo != error_mark_node | |
2003 | && ! BINFO_OFFSET_ZEROP (binfo)) | |
2004 | sorry ("adjusting pointers for covariant returns"); | |
2005 | } | |
2006 | if (TYPE_READONLY (d) > TYPE_READONLY (b)) | |
2007 | { | |
2008 | cp_error ("return type of `%#D' adds const", fndecl); | |
2009 | cp_error_at (" overriding definition as `%#D'", | |
2010 | tmp); | |
2011 | } | |
2012 | else if (TYPE_VOLATILE (d) > TYPE_VOLATILE (b)) | |
2013 | { | |
2014 | cp_error ("return type of `%#D' adds volatile", | |
2015 | fndecl); | |
2016 | cp_error_at (" overriding definition as `%#D'", | |
2017 | tmp); | |
2018 | } | |
2019 | } | |
2020 | else if (IS_AGGR_TYPE_2 (brettype, drettype) | |
2021 | && comptypes (brettype, drettype, 0)) | |
2022 | { | |
2023 | error ("invalid covariant return type (must use pointer or reference)"); | |
2024 | cp_error_at (" overriding `%#D'", tmp); | |
2025 | cp_error (" with `%#D'", fndecl); | |
2026 | } | |
2027 | else if (IDENTIFIER_ERROR_LOCUS (name) == NULL_TREE) | |
8d08fdba | 2028 | { |
700f8a87 | 2029 | cp_error ("conflicting return type specified for virtual function `%#D'", fndecl); |
e1cd6e56 | 2030 | cp_error_at (" overriding definition as `%#D'", tmp); |
8d08fdba MS |
2031 | SET_IDENTIFIER_ERROR_LOCUS (name, basetype); |
2032 | } | |
2033 | break; | |
2034 | } | |
2035 | } | |
2036 | if (tmp) | |
2037 | { | |
7177d104 MS |
2038 | best = tmp; |
2039 | break; | |
8d08fdba MS |
2040 | } |
2041 | } | |
2042 | if (best == NULL_TREE && warn_overloaded_virtual) | |
2043 | cp_warning_at ("conflicting specification deriving virtual function `%D'", fndecl); | |
2044 | ||
8d08fdba MS |
2045 | return best; |
2046 | } | |
2047 | } | |
2048 | ||
7177d104 MS |
2049 | /* Return the list of virtual functions which are abstract in type |
2050 | TYPE that come from non virtual base classes. See | |
2051 | expand_direct_vtbls_init for the style of search we do. */ | |
8926095f MS |
2052 | static tree |
2053 | get_abstract_virtuals_1 (binfo, do_self, abstract_virtuals) | |
2054 | tree binfo, abstract_virtuals; | |
2055 | int do_self; | |
8d08fdba | 2056 | { |
8926095f MS |
2057 | tree binfos = BINFO_BASETYPES (binfo); |
2058 | int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0; | |
8d08fdba | 2059 | |
8926095f | 2060 | for (i = 0; i < n_baselinks; i++) |
8d08fdba | 2061 | { |
8926095f MS |
2062 | tree base_binfo = TREE_VEC_ELT (binfos, i); |
2063 | int is_not_base_vtable = | |
2064 | i != CLASSTYPE_VFIELD_PARENT (BINFO_TYPE (binfo)); | |
2065 | if (! TREE_VIA_VIRTUAL (base_binfo)) | |
2066 | abstract_virtuals | |
2067 | = get_abstract_virtuals_1 (base_binfo, is_not_base_vtable, | |
2068 | abstract_virtuals); | |
2069 | } | |
2070 | /* Should we use something besides CLASSTYPE_VFIELDS? */ | |
2071 | if (do_self && CLASSTYPE_VFIELDS (BINFO_TYPE (binfo))) | |
2072 | { | |
db5ae43f | 2073 | /* Get around first entry reserved for RTTI. */ |
8926095f | 2074 | tree tmp = TREE_CHAIN (BINFO_VIRTUALS (binfo)); |
8d08fdba | 2075 | |
8d08fdba MS |
2076 | while (tmp) |
2077 | { | |
2078 | tree base_pfn = FNADDR_FROM_VTABLE_ENTRY (TREE_VALUE (tmp)); | |
2079 | tree base_fndecl = TREE_OPERAND (base_pfn, 0); | |
2080 | if (DECL_ABSTRACT_VIRTUAL_P (base_fndecl)) | |
2081 | abstract_virtuals = tree_cons (NULL_TREE, base_fndecl, abstract_virtuals); | |
2082 | tmp = TREE_CHAIN (tmp); | |
2083 | } | |
2084 | } | |
8926095f MS |
2085 | return abstract_virtuals; |
2086 | } | |
2087 | ||
2088 | /* Return the list of virtual functions which are abstract in type TYPE. | |
2089 | This information is cached, and so must be built on a | |
2090 | non-temporary obstack. */ | |
2091 | tree | |
2092 | get_abstract_virtuals (type) | |
2093 | tree type; | |
2094 | { | |
2095 | tree vbases, tmp; | |
2096 | tree abstract_virtuals = CLASSTYPE_ABSTRACT_VIRTUALS (type); | |
2097 | ||
2098 | /* First get all from non-virtual bases. */ | |
2099 | abstract_virtuals | |
2100 | = get_abstract_virtuals_1 (TYPE_BINFO (type), 1, abstract_virtuals); | |
2101 | ||
8d08fdba MS |
2102 | for (vbases = CLASSTYPE_VBASECLASSES (type); vbases; vbases = TREE_CHAIN (vbases)) |
2103 | { | |
2104 | if (! BINFO_VIRTUALS (vbases)) | |
2105 | continue; | |
2106 | ||
2107 | tmp = TREE_CHAIN (BINFO_VIRTUALS (vbases)); | |
2108 | while (tmp) | |
2109 | { | |
2110 | tree base_pfn = FNADDR_FROM_VTABLE_ENTRY (TREE_VALUE (tmp)); | |
2111 | tree base_fndecl = TREE_OPERAND (base_pfn, 0); | |
2112 | if (DECL_ABSTRACT_VIRTUAL_P (base_fndecl)) | |
2113 | abstract_virtuals = tree_cons (NULL_TREE, base_fndecl, abstract_virtuals); | |
2114 | tmp = TREE_CHAIN (tmp); | |
2115 | } | |
2116 | } | |
2117 | return nreverse (abstract_virtuals); | |
2118 | } | |
2119 | ||
2120 | /* For the type TYPE, return a list of member functions available from | |
2121 | base classes with name NAME. The TREE_VALUE of the list is a chain of | |
2122 | member functions with name NAME. The TREE_PURPOSE of the list is a | |
2123 | basetype, or a list of base types (in reverse order) which were | |
2124 | traversed to reach the chain of member functions. If we reach a base | |
2125 | type which provides a member function of name NAME, and which has at | |
2126 | most one base type itself, then we can terminate the search. */ | |
2127 | ||
2128 | tree | |
2129 | get_baselinks (type_as_binfo_list, type, name) | |
2130 | tree type_as_binfo_list; | |
2131 | tree type, name; | |
2132 | { | |
2133 | int head = 0, tail = 0, index; | |
2134 | tree rval = 0, nval = 0; | |
2135 | tree basetypes = type_as_binfo_list; | |
2136 | tree binfo = TYPE_BINFO (type); | |
2137 | ||
2138 | search_stack = push_search_level (search_stack, &search_obstack); | |
2139 | ||
2140 | while (1) | |
2141 | { | |
2142 | tree binfos = BINFO_BASETYPES (binfo); | |
2143 | int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0; | |
2144 | ||
2145 | /* Process and/or queue base types. */ | |
2146 | for (i = 0; i < n_baselinks; i++) | |
2147 | { | |
2148 | tree base_binfo = TREE_VEC_ELT (binfos, i); | |
2149 | tree btypes; | |
2150 | ||
2151 | btypes = hash_tree_cons (TREE_VIA_PUBLIC (base_binfo), | |
2152 | TREE_VIA_VIRTUAL (base_binfo), | |
2153 | TREE_VIA_PROTECTED (base_binfo), | |
2154 | NULL_TREE, base_binfo, | |
2155 | basetypes); | |
2156 | obstack_ptr_grow (&search_obstack, btypes); | |
2157 | search_stack->first = (tree *)obstack_base (&search_obstack); | |
2158 | tail += 1; | |
2159 | } | |
2160 | ||
2161 | dont_queue: | |
2162 | /* Process head of queue, if one exists. */ | |
2163 | if (head >= tail) | |
2164 | break; | |
2165 | ||
2166 | basetypes = search_stack->first[head++]; | |
2167 | binfo = TREE_VALUE (basetypes); | |
2168 | type = BINFO_TYPE (binfo); | |
2169 | index = lookup_fnfields_1 (type, name); | |
2170 | if (index >= 0) | |
2171 | { | |
2172 | nval = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (type), index); | |
2173 | rval = hash_tree_cons (0, 0, 0, basetypes, nval, rval); | |
2174 | if (TYPE_BINFO_BASETYPES (type) == 0) | |
2175 | goto dont_queue; | |
2176 | else if (TREE_VEC_LENGTH (TYPE_BINFO_BASETYPES (type)) == 1) | |
2177 | { | |
2178 | if (CLASSTYPE_BASELINK_VEC (type)) | |
2179 | TREE_TYPE (rval) = TREE_VEC_ELT (CLASSTYPE_BASELINK_VEC (type), index); | |
2180 | goto dont_queue; | |
2181 | } | |
2182 | } | |
2183 | nval = NULL_TREE; | |
2184 | } | |
2185 | ||
2186 | search_stack = pop_search_level (search_stack); | |
2187 | return rval; | |
2188 | } | |
2189 | ||
2190 | tree | |
2191 | next_baselink (baselink) | |
2192 | tree baselink; | |
2193 | { | |
2194 | tree tmp = TREE_TYPE (baselink); | |
2195 | baselink = TREE_CHAIN (baselink); | |
2196 | while (tmp) | |
2197 | { | |
2198 | /* @@ does not yet add previous base types. */ | |
2199 | baselink = tree_cons (TREE_PURPOSE (tmp), TREE_VALUE (tmp), | |
2200 | baselink); | |
2201 | TREE_TYPE (baselink) = TREE_TYPE (tmp); | |
2202 | tmp = TREE_CHAIN (tmp); | |
2203 | } | |
2204 | return baselink; | |
2205 | } | |
2206 | \f | |
2207 | /* DEPTH-FIRST SEARCH ROUTINES. */ | |
2208 | ||
2209 | /* Assign unique numbers to _CLASSTYPE members of the lattice | |
2210 | specified by TYPE. The root nodes are marked first; the nodes | |
2211 | are marked depth-fisrt, left-right. */ | |
2212 | ||
2213 | static int cid; | |
2214 | ||
2215 | /* Matrix implementing a relation from CLASSTYPE X CLASSTYPE => INT. | |
2216 | Relation yields 1 if C1 <= C2, 0 otherwise. */ | |
2217 | typedef char mi_boolean; | |
2218 | static mi_boolean *mi_matrix; | |
2219 | ||
2220 | /* Type for which this matrix is defined. */ | |
2221 | static tree mi_type; | |
2222 | ||
2223 | /* Size of the matrix for indexing purposes. */ | |
2224 | static int mi_size; | |
2225 | ||
2226 | /* Return nonzero if class C2 derives from class C1. */ | |
2227 | #define BINFO_DERIVES_FROM(C1, C2) \ | |
2228 | ((mi_matrix+mi_size*(BINFO_CID (C1)-1))[BINFO_CID (C2)-1]) | |
2229 | #define TYPE_DERIVES_FROM(C1, C2) \ | |
2230 | ((mi_matrix+mi_size*(CLASSTYPE_CID (C1)-1))[CLASSTYPE_CID (C2)-1]) | |
2231 | #define BINFO_DERIVES_FROM_STAR(C) \ | |
2232 | (mi_matrix+(BINFO_CID (C)-1)) | |
2233 | ||
2234 | /* This routine converts a pointer to be a pointer of an immediate | |
2235 | base class. The normal convert_pointer_to routine would diagnose | |
2236 | the conversion as ambiguous, under MI code that has the base class | |
2237 | as an ambiguous base class. */ | |
2238 | static tree | |
2239 | convert_pointer_to_single_level (to_type, expr) | |
2240 | tree to_type, expr; | |
2241 | { | |
2242 | tree binfo_of_derived; | |
2243 | tree last; | |
2244 | ||
2245 | binfo_of_derived = TYPE_BINFO (TREE_TYPE (TREE_TYPE (expr))); | |
2246 | last = get_binfo (to_type, TREE_TYPE (TREE_TYPE (expr)), 0); | |
2247 | BINFO_INHERITANCE_CHAIN (last) = binfo_of_derived; | |
2248 | BINFO_INHERITANCE_CHAIN (binfo_of_derived) = NULL_TREE; | |
2249 | return build_vbase_path (PLUS_EXPR, TYPE_POINTER_TO (to_type), expr, last, 1); | |
2250 | } | |
2251 | ||
2252 | /* The main function which implements depth first search. | |
2253 | ||
2254 | This routine has to remember the path it walked up, when | |
2255 | dfs_init_vbase_pointers is the work function, as otherwise there | |
2256 | would be no record. */ | |
2257 | static void | |
2258 | dfs_walk (binfo, fn, qfn) | |
2259 | tree binfo; | |
2260 | void (*fn)(); | |
2261 | int (*qfn)(); | |
2262 | { | |
2263 | tree binfos = BINFO_BASETYPES (binfo); | |
2264 | int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0; | |
2265 | ||
2266 | for (i = 0; i < n_baselinks; i++) | |
2267 | { | |
2268 | tree base_binfo = TREE_VEC_ELT (binfos, i); | |
2269 | ||
e1cd6e56 | 2270 | if (qfn == 0 || (*qfn)(base_binfo)) |
8d08fdba MS |
2271 | { |
2272 | if (fn == dfs_init_vbase_pointers) | |
2273 | { | |
2274 | /* When traversing an arbitrary MI hierarchy, we need to keep | |
2275 | a record of the path we took to get down to the final base | |
2276 | type, as otherwise there would be no record of it, and just | |
2277 | trying to blindly convert at the bottom would be ambiguous. | |
2278 | ||
2279 | The easiest way is to do the conversions one step at a time, | |
2280 | as we know we want the immediate base class at each step. | |
2281 | ||
2282 | The only special trick to converting one step at a time, | |
2283 | is that when we hit the last virtual base class, we must | |
2284 | use the SLOT value for it, and not use the normal convert | |
2285 | routine. We use the last virtual base class, as in our | |
2286 | implementation, we have pointers to all virtual base | |
2287 | classes in the base object. */ | |
2288 | ||
2289 | tree saved_vbase_decl_ptr_intermediate | |
2290 | = vbase_decl_ptr_intermediate; | |
2291 | ||
2292 | if (TREE_VIA_VIRTUAL (base_binfo)) | |
2293 | { | |
2294 | /* No need for the conversion here, as we know it is the | |
2295 | right type. */ | |
2296 | vbase_decl_ptr_intermediate | |
2297 | = (tree)CLASSTYPE_SEARCH_SLOT (BINFO_TYPE (base_binfo)); | |
2298 | } | |
2299 | else | |
2300 | { | |
2301 | vbase_decl_ptr_intermediate | |
2302 | = convert_pointer_to_single_level (BINFO_TYPE (base_binfo), | |
2303 | vbase_decl_ptr_intermediate); | |
2304 | } | |
2305 | ||
2306 | dfs_walk (base_binfo, fn, qfn); | |
2307 | ||
2308 | vbase_decl_ptr_intermediate = saved_vbase_decl_ptr_intermediate; | |
2309 | } else | |
2310 | dfs_walk (base_binfo, fn, qfn); | |
2311 | } | |
2312 | } | |
2313 | ||
2314 | fn (binfo); | |
2315 | } | |
2316 | ||
2317 | /* Predicate functions which serve for dfs_walk. */ | |
2318 | static int numberedp (binfo) tree binfo; | |
2319 | { return BINFO_CID (binfo); } | |
2320 | static int unnumberedp (binfo) tree binfo; | |
2321 | { return BINFO_CID (binfo) == 0; } | |
2322 | ||
2323 | static int markedp (binfo) tree binfo; | |
2324 | { return BINFO_MARKED (binfo); } | |
2325 | static int bfs_markedp (binfo, i) tree binfo; int i; | |
2326 | { return BINFO_MARKED (BINFO_BASETYPE (binfo, i)); } | |
2327 | static int unmarkedp (binfo) tree binfo; | |
2328 | { return BINFO_MARKED (binfo) == 0; } | |
2329 | static int bfs_unmarkedp (binfo, i) tree binfo; int i; | |
2330 | { return BINFO_MARKED (BINFO_BASETYPE (binfo, i)) == 0; } | |
2331 | static int marked_vtable_pathp (binfo) tree binfo; | |
2332 | { return BINFO_VTABLE_PATH_MARKED (binfo); } | |
2333 | static int bfs_marked_vtable_pathp (binfo, i) tree binfo; int i; | |
2334 | { return BINFO_VTABLE_PATH_MARKED (BINFO_BASETYPE (binfo, i)); } | |
2335 | static int unmarked_vtable_pathp (binfo) tree binfo; | |
2336 | { return BINFO_VTABLE_PATH_MARKED (binfo) == 0; } | |
2337 | static int bfs_unmarked_vtable_pathp (binfo, i) tree binfo; int i; | |
2338 | { return BINFO_VTABLE_PATH_MARKED (BINFO_BASETYPE (binfo, i)) == 0; } | |
2339 | static int marked_new_vtablep (binfo) tree binfo; | |
2340 | { return BINFO_NEW_VTABLE_MARKED (binfo); } | |
2341 | static int bfs_marked_new_vtablep (binfo, i) tree binfo; int i; | |
2342 | { return BINFO_NEW_VTABLE_MARKED (BINFO_BASETYPE (binfo, i)); } | |
2343 | static int unmarked_new_vtablep (binfo) tree binfo; | |
2344 | { return BINFO_NEW_VTABLE_MARKED (binfo) == 0; } | |
2345 | static int bfs_unmarked_new_vtablep (binfo, i) tree binfo; int i; | |
2346 | { return BINFO_NEW_VTABLE_MARKED (BINFO_BASETYPE (binfo, i)) == 0; } | |
2347 | ||
2348 | static int dfs_search_slot_nonempty_p (binfo) tree binfo; | |
2349 | { return CLASSTYPE_SEARCH_SLOT (BINFO_TYPE (binfo)) != 0; } | |
2350 | ||
2351 | static int dfs_debug_unmarkedp (binfo) tree binfo; | |
2352 | { return CLASSTYPE_DEBUG_REQUESTED (BINFO_TYPE (binfo)) == 0; } | |
2353 | ||
2354 | /* The worker functions for `dfs_walk'. These do not need to | |
2355 | test anything (vis a vis marking) if they are paired with | |
2356 | a predicate function (above). */ | |
2357 | ||
2358 | /* Assign each type within the lattice a number which is unique | |
2359 | in the lattice. The first number assigned is 1. */ | |
2360 | ||
2361 | static void | |
2362 | dfs_number (binfo) | |
2363 | tree binfo; | |
2364 | { | |
2365 | BINFO_CID (binfo) = ++cid; | |
2366 | } | |
2367 | ||
2368 | static void | |
2369 | dfs_unnumber (binfo) | |
2370 | tree binfo; | |
2371 | { | |
2372 | BINFO_CID (binfo) = 0; | |
2373 | } | |
2374 | ||
2375 | static void | |
2376 | dfs_mark (binfo) tree binfo; | |
2377 | { SET_BINFO_MARKED (binfo); } | |
2378 | ||
2379 | static void | |
2380 | dfs_unmark (binfo) tree binfo; | |
2381 | { CLEAR_BINFO_MARKED (binfo); } | |
2382 | ||
2383 | static void | |
2384 | dfs_mark_vtable_path (binfo) tree binfo; | |
2385 | { SET_BINFO_VTABLE_PATH_MARKED (binfo); } | |
2386 | ||
2387 | static void | |
2388 | dfs_unmark_vtable_path (binfo) tree binfo; | |
2389 | { CLEAR_BINFO_VTABLE_PATH_MARKED (binfo); } | |
2390 | ||
2391 | static void | |
2392 | dfs_mark_new_vtable (binfo) tree binfo; | |
2393 | { SET_BINFO_NEW_VTABLE_MARKED (binfo); } | |
2394 | ||
2395 | static void | |
2396 | dfs_unmark_new_vtable (binfo) tree binfo; | |
2397 | { CLEAR_BINFO_NEW_VTABLE_MARKED (binfo); } | |
2398 | ||
2399 | static void | |
2400 | dfs_clear_search_slot (binfo) tree binfo; | |
2401 | { CLASSTYPE_SEARCH_SLOT (BINFO_TYPE (binfo)) = 0; } | |
2402 | ||
2403 | static void | |
2404 | dfs_debug_mark (binfo) | |
2405 | tree binfo; | |
2406 | { | |
2407 | tree t = BINFO_TYPE (binfo); | |
2408 | ||
2409 | /* Use heuristic that if there are virtual functions, | |
2410 | ignore until we see a non-inline virtual function. */ | |
2411 | tree methods = CLASSTYPE_METHOD_VEC (t); | |
2412 | ||
2413 | CLASSTYPE_DEBUG_REQUESTED (t) = 1; | |
2414 | ||
2415 | /* If interface info is known, the value of (?@@?) is correct. */ | |
2416 | if (methods == 0 | |
2417 | || CLASSTYPE_INTERFACE_KNOWN (t) | |
2418 | || (write_virtuals == 2 && TYPE_VIRTUAL_P (t))) | |
2419 | return; | |
2420 | ||
2421 | /* If debug info is requested from this context for this type, supply it. | |
2422 | If debug info is requested from another context for this type, | |
2423 | see if some third context can supply it. */ | |
2424 | if (current_function_decl == NULL_TREE | |
2425 | || DECL_CLASS_CONTEXT (current_function_decl) != t) | |
2426 | { | |
2427 | if (TREE_VEC_ELT (methods, 0)) | |
2428 | methods = TREE_VEC_ELT (methods, 0); | |
2429 | else | |
2430 | methods = TREE_VEC_ELT (methods, 1); | |
2431 | while (methods) | |
2432 | { | |
2433 | if (DECL_VINDEX (methods) | |
44a8d0b3 | 2434 | && DECL_THIS_INLINE (methods) == 0 |
8d08fdba MS |
2435 | && DECL_ABSTRACT_VIRTUAL_P (methods) == 0) |
2436 | { | |
2437 | /* Somebody, somewhere is going to have to define this | |
2438 | virtual function. When they do, they will provide | |
2439 | the debugging info. */ | |
2440 | return; | |
2441 | } | |
2442 | methods = TREE_CHAIN (methods); | |
2443 | } | |
2444 | } | |
2445 | /* We cannot rely on some alien method to solve our problems, | |
2446 | so we must write out the debug info ourselves. */ | |
f0e01782 MS |
2447 | TYPE_DECL_SUPPRESS_DEBUG (TYPE_NAME (t)) = 0; |
2448 | rest_of_type_compilation (t, global_bindings_p ()); | |
8d08fdba MS |
2449 | } |
2450 | \f | |
2451 | /* Attach to the type of the virtual base class, the pointer to the | |
7177d104 MS |
2452 | virtual base class, given the global pointer vbase_decl_ptr. |
2453 | ||
2454 | We use the global vbase_types. ICK! */ | |
8d08fdba MS |
2455 | static void |
2456 | dfs_find_vbases (binfo) | |
2457 | tree binfo; | |
2458 | { | |
2459 | tree binfos = BINFO_BASETYPES (binfo); | |
2460 | int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0; | |
2461 | ||
2462 | for (i = n_baselinks-1; i >= 0; i--) | |
2463 | { | |
2464 | tree base_binfo = TREE_VEC_ELT (binfos, i); | |
2465 | ||
2466 | if (TREE_VIA_VIRTUAL (base_binfo) | |
2467 | && CLASSTYPE_SEARCH_SLOT (BINFO_TYPE (base_binfo)) == 0) | |
2468 | { | |
2469 | tree vbase = BINFO_TYPE (base_binfo); | |
2470 | tree binfo = binfo_member (vbase, vbase_types); | |
2471 | ||
2472 | CLASSTYPE_SEARCH_SLOT (vbase) | |
2473 | = (char *) build (PLUS_EXPR, TYPE_POINTER_TO (vbase), | |
2474 | vbase_decl_ptr, BINFO_OFFSET (binfo)); | |
2475 | } | |
2476 | } | |
2477 | SET_BINFO_VTABLE_PATH_MARKED (binfo); | |
2478 | SET_BINFO_NEW_VTABLE_MARKED (binfo); | |
2479 | } | |
2480 | ||
2481 | static void | |
2482 | dfs_init_vbase_pointers (binfo) | |
2483 | tree binfo; | |
2484 | { | |
2485 | tree type = BINFO_TYPE (binfo); | |
2486 | tree fields = TYPE_FIELDS (type); | |
8926095f | 2487 | tree this_vbase_ptr; |
8d08fdba MS |
2488 | |
2489 | CLEAR_BINFO_VTABLE_PATH_MARKED (binfo); | |
2490 | ||
db5ae43f | 2491 | /* If there is a rtti, it is the first field, though perhaps from |
8d08fdba MS |
2492 | the base class. Otherwise, the first fields are virtual base class |
2493 | pointer fields. */ | |
db5ae43f | 2494 | if (CLASSTYPE_RTTI (type) && VFIELD_NAME_P (DECL_NAME (fields))) |
8d08fdba MS |
2495 | /* Get past vtable for the object. */ |
2496 | fields = TREE_CHAIN (fields); | |
2497 | ||
2498 | if (fields == NULL_TREE | |
2499 | || DECL_NAME (fields) == NULL_TREE | |
2500 | || ! VBASE_NAME_P (DECL_NAME (fields))) | |
2501 | return; | |
2502 | ||
2503 | this_vbase_ptr = vbase_decl_ptr_intermediate; | |
2504 | ||
2986ae00 | 2505 | if (TYPE_POINTER_TO (type) != TYPE_MAIN_VARIANT (TREE_TYPE (this_vbase_ptr))) |
8d08fdba MS |
2506 | my_friendly_abort (125); |
2507 | ||
2508 | while (fields && DECL_NAME (fields) | |
2509 | && VBASE_NAME_P (DECL_NAME (fields))) | |
2510 | { | |
2511 | tree ref = build (COMPONENT_REF, TREE_TYPE (fields), | |
2512 | build_indirect_ref (this_vbase_ptr, NULL_PTR), fields); | |
2513 | tree init = (tree)CLASSTYPE_SEARCH_SLOT (TREE_TYPE (TREE_TYPE (fields))); | |
2514 | vbase_init_result = tree_cons (binfo_member (TREE_TYPE (TREE_TYPE (fields)), | |
2515 | vbase_types), | |
2516 | build_modify_expr (ref, NOP_EXPR, init), | |
2517 | vbase_init_result); | |
2518 | fields = TREE_CHAIN (fields); | |
2519 | } | |
2520 | } | |
2521 | ||
2522 | /* Sometimes this needs to clear both VTABLE_PATH and NEW_VTABLE. Other | |
2523 | times, just NEW_VTABLE, but optimizer should make both with equal | |
2524 | efficiency (though it does not currently). */ | |
2525 | static void | |
2526 | dfs_clear_vbase_slots (binfo) | |
2527 | tree binfo; | |
2528 | { | |
2529 | tree type = BINFO_TYPE (binfo); | |
2530 | CLASSTYPE_SEARCH_SLOT (type) = 0; | |
2531 | CLEAR_BINFO_VTABLE_PATH_MARKED (binfo); | |
2532 | CLEAR_BINFO_NEW_VTABLE_MARKED (binfo); | |
2533 | } | |
2534 | ||
2535 | tree | |
2536 | init_vbase_pointers (type, decl_ptr) | |
2537 | tree type; | |
2538 | tree decl_ptr; | |
2539 | { | |
2540 | if (TYPE_USES_VIRTUAL_BASECLASSES (type)) | |
2541 | { | |
2542 | int old_flag = flag_this_is_variable; | |
2543 | tree binfo = TYPE_BINFO (type); | |
2544 | flag_this_is_variable = -2; | |
2545 | vbase_types = CLASSTYPE_VBASECLASSES (type); | |
2546 | vbase_decl_ptr = decl_ptr; | |
2547 | vbase_decl = build_indirect_ref (decl_ptr, NULL_PTR); | |
2548 | vbase_decl_ptr_intermediate = vbase_decl_ptr; | |
2549 | vbase_init_result = NULL_TREE; | |
2550 | dfs_walk (binfo, dfs_find_vbases, unmarked_vtable_pathp); | |
2551 | dfs_walk (binfo, dfs_init_vbase_pointers, marked_vtable_pathp); | |
2552 | dfs_walk (binfo, dfs_clear_vbase_slots, marked_new_vtablep); | |
2553 | flag_this_is_variable = old_flag; | |
2554 | return vbase_init_result; | |
2555 | } | |
2556 | return 0; | |
2557 | } | |
2558 | ||
43f2999d MS |
2559 | /* get the virtual context (the vbase that directly contains the |
2560 | DECL_CLASS_CONTEXT of the FNDECL) that the given FNDECL is declared in, | |
2561 | or NULL_TREE if there is none. | |
2562 | ||
2563 | FNDECL must come from a virtual table from a virtual base to ensure that | |
2564 | there is only one possible DECL_CLASS_CONTEXT. | |
2565 | ||
2566 | We know that if there is more than one place (binfo) the fndecl that the | |
2567 | declared, they all refer to the same binfo. See get_class_offset_1 for | |
2568 | the check that ensures this. */ | |
2569 | static tree | |
2570 | virtual_context (fndecl, t, vbase) | |
2571 | tree fndecl, t, vbase; | |
2572 | { | |
2573 | tree path; | |
2574 | if (get_base_distance (DECL_CLASS_CONTEXT (fndecl), t, 0, &path) < 0) | |
2575 | { | |
2576 | /* This shouldn't happen, I don't want errors! */ | |
2577 | warning ("recoverable compiler error, fixups for virtual function"); | |
2578 | return vbase; | |
2579 | } | |
2580 | while (path) | |
2581 | { | |
2582 | if (TREE_VIA_VIRTUAL (path)) | |
2583 | return binfo_member (BINFO_TYPE (path), CLASSTYPE_VBASECLASSES (t)); | |
2584 | path = BINFO_INHERITANCE_CHAIN (path); | |
2585 | } | |
2586 | return 0; | |
2587 | } | |
2588 | ||
2589 | /* Fixups upcast offsets for one vtable. | |
2590 | Entries may stay within the VBASE given, or | |
2591 | they may upcast into a direct base, or | |
2592 | they may upcast into a different vbase. | |
2593 | ||
2594 | We only need to do fixups in case 2 and 3. | |
2595 | ||
2596 | This routine mirrors fixup_vtable_deltas in functionality, though | |
2597 | this one is runtime based, and the other is compile time based. | |
2598 | Conceivably that routine could be removed entirely, and all fixups | |
2599 | done at runtime. | |
2600 | ||
2601 | VBASE_OFFSETS is an association list of virtual bases that contains | |
2602 | offset information, so the offsets are only calculated once. */ | |
2603 | static void | |
2604 | expand_upcast_fixups (binfo, addr, orig_addr, vbase, t, vbase_offsets) | |
2605 | tree binfo, addr, orig_addr, vbase, t, *vbase_offsets; | |
2606 | { | |
2607 | tree virtuals = BINFO_VIRTUALS (binfo); | |
2608 | tree vc; | |
2609 | tree delta; | |
2610 | unsigned HOST_WIDE_INT n; | |
2611 | ||
2612 | delta = purpose_member (vbase, *vbase_offsets); | |
2613 | if (! delta) | |
2614 | { | |
2615 | delta = (tree)CLASSTYPE_SEARCH_SLOT (BINFO_TYPE (vbase)); | |
2616 | delta = build (MINUS_EXPR, ptrdiff_type_node, delta, addr); | |
2617 | delta = save_expr (delta); | |
2618 | delta = tree_cons (vbase, delta, *vbase_offsets); | |
2619 | *vbase_offsets = delta; | |
2620 | } | |
2621 | ||
2622 | /* Skip RTTI fake object. */ | |
2623 | n = 1; | |
2624 | if (virtuals) | |
2625 | virtuals = TREE_CHAIN (virtuals); | |
2626 | while (virtuals) | |
2627 | { | |
2628 | tree current_fndecl = TREE_VALUE (virtuals); | |
2629 | current_fndecl = FNADDR_FROM_VTABLE_ENTRY (current_fndecl); | |
2630 | current_fndecl = TREE_OPERAND (current_fndecl, 0); | |
2631 | if (current_fndecl | |
e8abc66f | 2632 | && current_fndecl != abort_fndecl |
43f2999d MS |
2633 | && (vc=virtual_context (current_fndecl, t, vbase)) != vbase) |
2634 | { | |
2635 | /* This may in fact need a runtime fixup. */ | |
2636 | tree idx = DECL_VINDEX (current_fndecl); | |
2637 | tree vtbl = BINFO_VTABLE (binfo); | |
2638 | tree nvtbl = lookup_name (DECL_NAME (vtbl), 0); | |
2639 | tree aref, ref, naref; | |
2640 | tree old_delta, new_delta; | |
2641 | tree init; | |
2642 | ||
2643 | if (nvtbl == NULL_TREE | |
2644 | || nvtbl == IDENTIFIER_GLOBAL_VALUE (DECL_NAME (vtbl))) | |
2645 | { | |
2646 | /* Dup it if it isn't in local scope yet. */ | |
2647 | nvtbl = build_decl (VAR_DECL, | |
2648 | DECL_NAME (vtbl), | |
2649 | TYPE_MAIN_VARIANT (TREE_TYPE (BINFO_VTABLE (binfo)))); | |
2650 | DECL_ALIGN (nvtbl) = MAX (TYPE_ALIGN (double_type_node), | |
2651 | DECL_ALIGN (nvtbl)); | |
2652 | TREE_READONLY (nvtbl) = 0; | |
2653 | nvtbl = pushdecl (nvtbl); | |
2654 | init = NULL_TREE; | |
b3417a04 | 2655 | cp_finish_decl (nvtbl, init, NULL_TREE, 0, LOOKUP_ONLYCONVERTING); |
43f2999d MS |
2656 | DECL_VIRTUAL_P (nvtbl) = 1; |
2657 | DECL_CONTEXT (nvtbl) = t; | |
2658 | init = build (MODIFY_EXPR, TREE_TYPE (nvtbl), | |
2659 | nvtbl, vtbl); | |
2660 | TREE_SIDE_EFFECTS (init) = 1; | |
2661 | expand_expr_stmt (init); | |
2662 | /* Update the vtable pointers as necessary. */ | |
2663 | ref = build_vfield_ref (build_indirect_ref (addr, NULL_PTR), DECL_CONTEXT (CLASSTYPE_VFIELD (BINFO_TYPE (binfo)))); | |
2664 | expand_expr_stmt (build_modify_expr (ref, NOP_EXPR, | |
2665 | build_unary_op (ADDR_EXPR, nvtbl, 0))); | |
2666 | } | |
2667 | assemble_external (vtbl); | |
2668 | aref = build_array_ref (vtbl, idx); | |
2669 | naref = build_array_ref (nvtbl, idx); | |
2670 | old_delta = build_component_ref (aref, delta_identifier, 0, 0); | |
2671 | new_delta = build_component_ref (naref, delta_identifier, 0, 0); | |
2672 | old_delta = build_binary_op (PLUS_EXPR, old_delta, | |
2673 | TREE_VALUE (delta), 0); | |
2674 | if (vc) | |
2675 | { | |
2676 | /* If this is set, we need to add in delta adjustments for | |
2677 | the other virtual base. */ | |
2678 | tree vc_delta = purpose_member (vc, *vbase_offsets); | |
2679 | if (! vc_delta) | |
2680 | { | |
2681 | tree vc_addr = convert_pointer_to_real (vc, orig_addr); | |
2682 | vc_delta = (tree)CLASSTYPE_SEARCH_SLOT (BINFO_TYPE (vc)); | |
2683 | vc_delta = build (MINUS_EXPR, ptrdiff_type_node, | |
2684 | vc_addr, vc_delta); | |
2685 | vc_delta = save_expr (vc_delta); | |
2686 | *vbase_offsets = tree_cons (vc, vc_delta, *vbase_offsets); | |
2687 | } | |
2688 | else | |
2689 | vc_delta = TREE_VALUE (vc_delta); | |
2690 | ||
2691 | old_delta = build_binary_op (PLUS_EXPR, old_delta, vc_delta, 0); | |
2692 | } | |
2693 | ||
2694 | TREE_READONLY (new_delta) = 0; | |
2695 | expand_expr_stmt (build_modify_expr (new_delta, NOP_EXPR, | |
2696 | old_delta)); | |
2697 | } | |
2698 | ++n; | |
2699 | virtuals = TREE_CHAIN (virtuals); | |
2700 | } | |
2701 | } | |
2702 | ||
2703 | /* Fixup upcast offsets for all direct vtables. Patterned after | |
2704 | expand_direct_vtbls_init. */ | |
2705 | static void | |
2706 | fixup_virtual_upcast_offsets (real_binfo, binfo, init_self, can_elide, addr, orig_addr, type, vbase, vbase_offsets) | |
2707 | tree real_binfo, binfo, addr, orig_addr, type, vbase, *vbase_offsets; | |
2708 | int init_self, can_elide; | |
2709 | { | |
2710 | tree real_binfos = BINFO_BASETYPES (real_binfo); | |
2711 | tree binfos = BINFO_BASETYPES (binfo); | |
2712 | int i, n_baselinks = real_binfos ? TREE_VEC_LENGTH (real_binfos) : 0; | |
2713 | ||
2714 | for (i = 0; i < n_baselinks; i++) | |
2715 | { | |
2716 | tree real_base_binfo = TREE_VEC_ELT (real_binfos, i); | |
2717 | tree base_binfo = TREE_VEC_ELT (binfos, i); | |
2718 | int is_not_base_vtable = | |
2719 | i != CLASSTYPE_VFIELD_PARENT (BINFO_TYPE (real_binfo)); | |
2720 | if (! TREE_VIA_VIRTUAL (real_base_binfo)) | |
2721 | fixup_virtual_upcast_offsets (real_base_binfo, base_binfo, | |
2722 | is_not_base_vtable, can_elide, addr, | |
2723 | orig_addr, type, vbase, vbase_offsets); | |
2724 | } | |
2725 | #if 0 | |
2726 | /* Before turning this on, make sure it is correct. */ | |
2727 | if (can_elide && ! BINFO_MODIFIED (binfo)) | |
2728 | return; | |
2729 | #endif | |
2730 | /* Should we use something besides CLASSTYPE_VFIELDS? */ | |
2731 | if (init_self && CLASSTYPE_VFIELDS (BINFO_TYPE (real_binfo))) | |
2732 | { | |
2733 | addr = convert_pointer_to_real (binfo, addr); | |
2734 | expand_upcast_fixups (real_binfo, addr, orig_addr, vbase, type, vbase_offsets); | |
2735 | } | |
2736 | } | |
2737 | ||
8d08fdba MS |
2738 | /* Build a COMPOUND_EXPR which when expanded will generate the code |
2739 | needed to initialize all the virtual function table slots of all | |
7177d104 MS |
2740 | the virtual baseclasses. MAIN_BINFO is the binfo which determines |
2741 | the virtual baseclasses to use; TYPE is the type of the object to | |
2742 | which the initialization applies. TRUE_EXP is the true object we | |
2743 | are initializing, and DECL_PTR is the pointer to the sub-object we | |
8d08fdba MS |
2744 | are initializing. |
2745 | ||
2746 | When USE_COMPUTED_OFFSETS is non-zero, we can assume that the | |
ddd5a7c1 | 2747 | object was laid out by a top-level constructor and the computed |
8d08fdba | 2748 | offsets are valid to store vtables. When zero, we must store new |
7177d104 MS |
2749 | vtables through virtual baseclass pointers. |
2750 | ||
2751 | We setup and use the globals: vbase_decl, vbase_decl_ptr, vbase_types | |
2752 | ICK! */ | |
8d08fdba | 2753 | |
8926095f | 2754 | void |
7177d104 MS |
2755 | expand_indirect_vtbls_init (binfo, true_exp, decl_ptr, use_computed_offsets) |
2756 | tree binfo; | |
8d08fdba MS |
2757 | tree true_exp, decl_ptr; |
2758 | int use_computed_offsets; | |
2759 | { | |
8d08fdba MS |
2760 | tree type = BINFO_TYPE (binfo); |
2761 | if (TYPE_USES_VIRTUAL_BASECLASSES (type)) | |
2762 | { | |
43f2999d | 2763 | rtx fixup_insns = NULL_RTX; |
8d08fdba | 2764 | int old_flag = flag_this_is_variable; |
8d08fdba | 2765 | tree vbases = CLASSTYPE_VBASECLASSES (type); |
7177d104 | 2766 | vbase_types = vbases; |
8d08fdba MS |
2767 | vbase_decl_ptr = true_exp ? build_unary_op (ADDR_EXPR, true_exp, 0) : decl_ptr; |
2768 | vbase_decl = true_exp ? true_exp : build_indirect_ref (decl_ptr, NULL_PTR); | |
2769 | ||
2770 | if (use_computed_offsets) | |
2771 | { | |
2772 | /* This is an object of type IN_TYPE, */ | |
2773 | flag_this_is_variable = -2; | |
8d08fdba MS |
2774 | } |
2775 | ||
43f2999d MS |
2776 | dfs_walk (binfo, dfs_find_vbases, unmarked_new_vtablep); |
2777 | ||
8d08fdba | 2778 | /* Initialized with vtables of type TYPE. */ |
39211cd5 | 2779 | for (; vbases; vbases = TREE_CHAIN (vbases)) |
8d08fdba | 2780 | { |
7177d104 MS |
2781 | tree addr; |
2782 | if (use_computed_offsets) | |
2783 | addr = (tree)CLASSTYPE_SEARCH_SLOT (BINFO_TYPE (vbases)); | |
2784 | else | |
2986ae00 MS |
2785 | { |
2786 | tree vbinfo = get_binfo (TREE_TYPE (vbases), | |
2787 | TREE_TYPE (vbase_decl), | |
2788 | 0); | |
2789 | ||
2790 | /* See is we can get lucky. */ | |
2791 | if (TREE_VIA_VIRTUAL (vbinfo)) | |
2792 | addr = convert_pointer_to_real (vbinfo, vbase_decl_ptr); | |
2793 | else | |
2794 | { | |
2795 | /* We go through all these contortions to avoid this | |
2796 | call, as it will fail when the virtual base type | |
2797 | is ambiguous from here. We don't yet have a way | |
2798 | to search for and find just an instance of the | |
2799 | virtual base class. Searching for the binfo in | |
2800 | vbases won't work, as we don't have the vbase | |
2801 | pointer field, for all vbases in the main class, | |
2802 | only direct vbases. */ | |
2803 | addr = convert_pointer_to_real (TREE_TYPE (vbases), | |
2804 | vbase_decl_ptr); | |
2805 | if (addr == error_mark_node) | |
2806 | continue; | |
2807 | } | |
2808 | } | |
8d08fdba | 2809 | |
7177d104 MS |
2810 | /* Do all vtables from this virtual base. */ |
2811 | /* This assumes that virtual bases can never serve as parent | |
2812 | binfos. (in the CLASSTPE_VFIELD_PARENT sense) */ | |
2813 | expand_direct_vtbls_init (vbases, TYPE_BINFO (BINFO_TYPE (vbases)), | |
2814 | 1, 0, addr); | |
43f2999d MS |
2815 | |
2816 | /* If we are using computed offsets we can skip fixups. */ | |
2817 | if (use_computed_offsets) | |
2818 | continue; | |
2819 | ||
2820 | /* Now we adjust the offsets for virtual functions that cross | |
2821 | virtual boundaries on an implicit upcast on vf call so that | |
2822 | the layout of the most complete type is used, instead of | |
2823 | assuming the layout of the virtual bases from our current type. */ | |
2824 | ||
2825 | if (flag_vtable_thunks) | |
2826 | { | |
2827 | /* We don't have dynamic thunks yet! So for now, just fail silently. */ | |
2828 | } | |
2829 | else | |
2830 | { | |
2831 | tree vbase_offsets = NULL_TREE; | |
2832 | push_to_sequence (fixup_insns); | |
2833 | fixup_virtual_upcast_offsets (vbases, | |
2834 | TYPE_BINFO (BINFO_TYPE (vbases)), | |
2835 | 1, 0, addr, vbase_decl_ptr, | |
2836 | type, vbases, &vbase_offsets); | |
2837 | fixup_insns = get_insns (); | |
2838 | end_sequence (); | |
2839 | } | |
2840 | } | |
2841 | ||
2842 | if (fixup_insns) | |
2843 | { | |
2844 | extern tree in_charge_identifier; | |
2845 | tree in_charge_node = lookup_name (in_charge_identifier, 0); | |
2846 | if (! in_charge_node) | |
2847 | { | |
2848 | warning ("recoverable internal compiler error, nobody's in charge!"); | |
2849 | in_charge_node = integer_zero_node; | |
2850 | } | |
2851 | in_charge_node = build_binary_op (EQ_EXPR, in_charge_node, integer_zero_node, 1); | |
2852 | expand_start_cond (in_charge_node, 0); | |
2853 | emit_insns (fixup_insns); | |
2854 | expand_end_cond (); | |
8d08fdba MS |
2855 | } |
2856 | ||
2857 | dfs_walk (binfo, dfs_clear_vbase_slots, marked_new_vtablep); | |
2858 | ||
2859 | flag_this_is_variable = old_flag; | |
8d08fdba | 2860 | } |
8d08fdba MS |
2861 | } |
2862 | ||
2863 | void | |
2864 | clear_search_slots (type) | |
2865 | tree type; | |
2866 | { | |
2867 | dfs_walk (TYPE_BINFO (type), | |
2868 | dfs_clear_search_slot, dfs_search_slot_nonempty_p); | |
2869 | } | |
2870 | ||
2871 | /* get virtual base class types. | |
2872 | This adds type to the vbase_types list in reverse dfs order. | |
2873 | Ordering is very important, so don't change it. */ | |
2874 | ||
2875 | static void | |
2876 | dfs_get_vbase_types (binfo) | |
2877 | tree binfo; | |
2878 | { | |
51c184be | 2879 | if (TREE_VIA_VIRTUAL (binfo) && ! BINFO_VBASE_MARKED (binfo)) |
8d08fdba | 2880 | { |
8926095f | 2881 | vbase_types = make_binfo (integer_zero_node, binfo, |
51c184be MS |
2882 | BINFO_VTABLE (binfo), |
2883 | BINFO_VIRTUALS (binfo), vbase_types); | |
2884 | TREE_VIA_VIRTUAL (vbase_types) = 1; | |
2885 | SET_BINFO_VBASE_MARKED (binfo); | |
8d08fdba MS |
2886 | } |
2887 | SET_BINFO_MARKED (binfo); | |
2888 | } | |
2889 | ||
51c184be | 2890 | /* get a list of virtual base classes in dfs order. */ |
8d08fdba MS |
2891 | tree |
2892 | get_vbase_types (type) | |
2893 | tree type; | |
2894 | { | |
8d08fdba | 2895 | tree vbases; |
51c184be MS |
2896 | tree binfo; |
2897 | ||
2898 | if (TREE_CODE (type) == TREE_VEC) | |
2899 | binfo = type; | |
2900 | else | |
2901 | binfo = TYPE_BINFO (type); | |
8d08fdba MS |
2902 | |
2903 | vbase_types = NULL_TREE; | |
51c184be MS |
2904 | dfs_walk (binfo, dfs_get_vbase_types, unmarkedp); |
2905 | dfs_walk (binfo, dfs_unmark, markedp); | |
8d08fdba MS |
2906 | /* Rely upon the reverse dfs ordering from dfs_get_vbase_types, and now |
2907 | reverse it so that we get normal dfs ordering. */ | |
2908 | vbase_types = nreverse (vbase_types); | |
2909 | ||
51c184be MS |
2910 | /* unmark marked vbases */ |
2911 | for (vbases = vbase_types; vbases; vbases = TREE_CHAIN (vbases)) | |
2912 | CLEAR_BINFO_VBASE_MARKED (vbases); | |
8d08fdba | 2913 | |
51c184be | 2914 | return vbase_types; |
8d08fdba MS |
2915 | } |
2916 | \f | |
2917 | static void | |
2918 | dfs_record_inheritance (binfo) | |
2919 | tree binfo; | |
2920 | { | |
2921 | tree binfos = BINFO_BASETYPES (binfo); | |
2922 | int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0; | |
2923 | mi_boolean *derived_row = BINFO_DERIVES_FROM_STAR (binfo); | |
2924 | ||
2925 | for (i = n_baselinks-1; i >= 0; i--) | |
2926 | { | |
2927 | int j; | |
2928 | tree base_binfo = TREE_VEC_ELT (binfos, i); | |
2929 | tree baseclass = BINFO_TYPE (base_binfo); | |
2930 | mi_boolean *base_row = BINFO_DERIVES_FROM_STAR (base_binfo); | |
2931 | ||
2932 | /* Don't search if there's nothing there! MI_SIZE can be | |
2933 | zero as a result of parse errors. */ | |
2934 | if (TYPE_BINFO_BASETYPES (baseclass) && mi_size > 0) | |
2935 | for (j = mi_size*(CLASSTYPE_CID (baseclass)-1); j >= 0; j -= mi_size) | |
2936 | derived_row[j] |= base_row[j]; | |
2937 | TYPE_DERIVES_FROM (baseclass, BINFO_TYPE (binfo)) = 1; | |
2938 | } | |
2939 | ||
2940 | SET_BINFO_MARKED (binfo); | |
2941 | } | |
2942 | ||
2943 | /* Given a _CLASSTYPE node in a multiple inheritance lattice, | |
2944 | convert the lattice into a simple relation such that, | |
2945 | given to CIDs, C1 and C2, one can determine if C1 <= C2 | |
2946 | or C2 <= C1 or C1 <> C2. | |
2947 | ||
2948 | Once constructed, we walk the lattice depth fisrt, | |
2949 | applying various functions to elements as they are encountered. | |
2950 | ||
2951 | We use xmalloc here, in case we want to randomly free these tables. */ | |
2952 | ||
2953 | #define SAVE_MI_MATRIX | |
2954 | ||
2955 | void | |
2956 | build_mi_matrix (type) | |
2957 | tree type; | |
2958 | { | |
2959 | tree binfo = TYPE_BINFO (type); | |
2960 | cid = 0; | |
2961 | ||
2962 | #ifdef SAVE_MI_MATRIX | |
2963 | if (CLASSTYPE_MI_MATRIX (type)) | |
2964 | { | |
2965 | mi_size = CLASSTYPE_N_SUPERCLASSES (type) + CLASSTYPE_N_VBASECLASSES (type); | |
2966 | mi_matrix = CLASSTYPE_MI_MATRIX (type); | |
2967 | mi_type = type; | |
2968 | dfs_walk (binfo, dfs_number, unnumberedp); | |
2969 | return; | |
2970 | } | |
2971 | #endif | |
2972 | ||
2973 | mi_size = CLASSTYPE_N_SUPERCLASSES (type) + CLASSTYPE_N_VBASECLASSES (type); | |
2974 | mi_matrix = (char *)xmalloc ((mi_size + 1) * (mi_size + 1)); | |
2975 | mi_type = type; | |
2976 | bzero (mi_matrix, (mi_size + 1) * (mi_size + 1)); | |
2977 | dfs_walk (binfo, dfs_number, unnumberedp); | |
2978 | dfs_walk (binfo, dfs_record_inheritance, unmarkedp); | |
2979 | dfs_walk (binfo, dfs_unmark, markedp); | |
2980 | } | |
2981 | ||
2982 | void | |
2983 | free_mi_matrix () | |
2984 | { | |
2985 | dfs_walk (TYPE_BINFO (mi_type), dfs_unnumber, numberedp); | |
2986 | ||
2987 | #ifdef SAVE_MI_MATRIX | |
2988 | CLASSTYPE_MI_MATRIX (mi_type) = mi_matrix; | |
2989 | #else | |
2990 | free (mi_matrix); | |
2991 | mi_size = 0; | |
2992 | cid = 0; | |
2993 | #endif | |
2994 | } | |
2995 | \f | |
2996 | /* If we want debug info for a type TYPE, make sure all its base types | |
2997 | are also marked as being potentially interesting. This avoids | |
2998 | the problem of not writing any debug info for intermediate basetypes | |
a292b002 | 2999 | that have abstract virtual functions. Also mark member types. */ |
8d08fdba MS |
3000 | |
3001 | void | |
3002 | note_debug_info_needed (type) | |
3003 | tree type; | |
3004 | { | |
a292b002 | 3005 | tree field; |
8d08fdba | 3006 | dfs_walk (TYPE_BINFO (type), dfs_debug_mark, dfs_debug_unmarkedp); |
a292b002 MS |
3007 | for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) |
3008 | { | |
3009 | tree ttype; | |
3010 | if (TREE_CODE (field) == FIELD_DECL | |
3011 | && IS_AGGR_TYPE (ttype = target_type (TREE_TYPE (field))) | |
3012 | && dfs_debug_unmarkedp (TYPE_BINFO (ttype))) | |
3013 | note_debug_info_needed (ttype); | |
3014 | } | |
8d08fdba MS |
3015 | } |
3016 | \f | |
3017 | /* Subroutines of push_class_decls (). */ | |
3018 | ||
3019 | /* Add the instance variables which this class contributed to the | |
3020 | current class binding contour. When a redefinition occurs, | |
3021 | if the redefinition is strictly within a single inheritance path, | |
3022 | we just overwrite (in the case of a data field) or | |
3023 | cons (in the case of a member function) the old declaration with | |
3024 | the new. If the fields are not within a single inheritance path, | |
3025 | we must cons them in either case. | |
3026 | ||
3027 | In order to know what decls are new (stemming from the current | |
3028 | invocation of push_class_decls) we enclose them in an "envelope", | |
3029 | which is a TREE_LIST node where the TREE_PURPOSE slot contains the | |
3030 | new decl (or possibly a list of competing ones), the TREE_VALUE slot | |
3031 | points to the old value and the TREE_CHAIN slot chains together all | |
3032 | envelopes which needs to be "opened" in push_class_decls. Opening an | |
3033 | envelope means: push the old value onto the class_shadowed list, | |
3034 | install the new one and if it's a TYPE_DECL do the same to the | |
3035 | IDENTIFIER_TYPE_VALUE. Such an envelope is recognized by seeing that | |
3036 | the TREE_PURPOSE slot is non-null, and that it is not an identifier. | |
3037 | Because if it is, it could be a set of overloaded methods from an | |
3038 | outer scope. */ | |
3039 | ||
3040 | static void | |
3041 | dfs_pushdecls (binfo) | |
3042 | tree binfo; | |
3043 | { | |
3044 | tree type = BINFO_TYPE (binfo); | |
3045 | tree fields, *methods, *end; | |
3046 | tree method_vec; | |
3047 | ||
3048 | for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields)) | |
3049 | { | |
3050 | /* Unmark so that if we are in a constructor, and then find that | |
3051 | this field was initialized by a base initializer, | |
3052 | we can emit an error message. */ | |
3053 | if (TREE_CODE (fields) == FIELD_DECL) | |
3054 | TREE_USED (fields) = 0; | |
3055 | ||
3056 | /* Recurse into anonymous unions. */ | |
3057 | if (DECL_NAME (fields) == NULL_TREE | |
3058 | && TREE_CODE (TREE_TYPE (fields)) == UNION_TYPE) | |
3059 | { | |
3060 | dfs_pushdecls (TYPE_BINFO (TREE_TYPE (fields))); | |
3061 | continue; | |
3062 | } | |
3063 | ||
3064 | #if 0 | |
3065 | if (TREE_CODE (fields) != TYPE_DECL) | |
3066 | { | |
3067 | DECL_PUBLIC (fields) = 0; | |
3068 | DECL_PROTECTED (fields) = 0; | |
3069 | DECL_PRIVATE (fields) = 0; | |
3070 | } | |
3071 | #endif | |
3072 | ||
3073 | if (DECL_NAME (fields)) | |
3074 | { | |
3075 | tree class_value = IDENTIFIER_CLASS_VALUE (DECL_NAME (fields)); | |
3076 | ||
3077 | /* If the class value is an envelope of the kind described in | |
3078 | the comment above, we try to rule out possible ambiguities. | |
3079 | If we can't do that, keep a TREE_LIST with possibly ambiguous | |
3080 | decls in there. */ | |
3081 | if (class_value && TREE_CODE (class_value) == TREE_LIST | |
3082 | && TREE_PURPOSE (class_value) != NULL_TREE | |
3083 | && (TREE_CODE (TREE_PURPOSE (class_value)) | |
3084 | != IDENTIFIER_NODE)) | |
3085 | { | |
3086 | tree value = TREE_PURPOSE (class_value); | |
3087 | tree context; | |
3088 | ||
3089 | /* Possible ambiguity. If its defining type(s) | |
3090 | is (are all) derived from us, no problem. */ | |
3091 | if (TREE_CODE (value) != TREE_LIST) | |
3092 | { | |
3093 | context = (TREE_CODE (value) == FUNCTION_DECL | |
3094 | && DECL_VIRTUAL_P (value)) | |
3095 | ? DECL_CLASS_CONTEXT (value) | |
3096 | : DECL_CONTEXT (value); | |
3097 | ||
e1cd6e56 MS |
3098 | if (context == type) |
3099 | { | |
3100 | if (TREE_CODE (value) == TYPE_DECL | |
3101 | && DECL_ARTIFICIAL (value)) | |
3102 | value = fields; | |
3103 | /* else the old value wins */ | |
3104 | } | |
3105 | else if (context && TYPE_DERIVES_FROM (context, type)) | |
8d08fdba MS |
3106 | value = fields; |
3107 | else | |
3108 | value = tree_cons (NULL_TREE, fields, | |
3109 | build_tree_list (NULL_TREE, value)); | |
3110 | } | |
3111 | else | |
3112 | { | |
3113 | /* All children may derive from us, in which case | |
3114 | there is no problem. Otherwise, we have to | |
3115 | keep lists around of what the ambiguities might be. */ | |
3116 | tree values; | |
3117 | int problem = 0; | |
3118 | ||
3119 | for (values = value; values; values = TREE_CHAIN (values)) | |
3120 | { | |
3121 | tree sub_values = TREE_VALUE (values); | |
3122 | ||
3123 | if (TREE_CODE (sub_values) == TREE_LIST) | |
3124 | { | |
3125 | for (; sub_values; sub_values = TREE_CHAIN (sub_values)) | |
3126 | { | |
3127 | register tree list_mbr = TREE_VALUE (sub_values); | |
3128 | ||
3129 | context = (TREE_CODE (list_mbr) == FUNCTION_DECL | |
3130 | && DECL_VIRTUAL_P (list_mbr)) | |
3131 | ? DECL_CLASS_CONTEXT (list_mbr) | |
3132 | : DECL_CONTEXT (list_mbr); | |
3133 | ||
3134 | if (! TYPE_DERIVES_FROM (context, type)) | |
3135 | { | |
3136 | value = tree_cons (NULL_TREE, TREE_VALUE (values), value); | |
3137 | problem = 1; | |
3138 | break; | |
3139 | } | |
3140 | } | |
3141 | } | |
3142 | else | |
3143 | { | |
3144 | context = (TREE_CODE (sub_values) == FUNCTION_DECL | |
3145 | && DECL_VIRTUAL_P (sub_values)) | |
3146 | ? DECL_CLASS_CONTEXT (sub_values) | |
3147 | : DECL_CONTEXT (sub_values); | |
3148 | ||
3149 | if (context && ! TYPE_DERIVES_FROM (context, type)) | |
3150 | { | |
3151 | value = tree_cons (NULL_TREE, values, value); | |
3152 | problem = 1; | |
3153 | break; | |
3154 | } | |
3155 | } | |
3156 | } | |
3157 | if (! problem) value = fields; | |
3158 | } | |
3159 | ||
3160 | /* Mark this as a potentially ambiguous member. */ | |
3161 | if (TREE_CODE (value) == TREE_LIST) | |
3162 | { | |
3163 | /* Leaving TREE_TYPE blank is intentional. | |
3164 | We cannot use `error_mark_node' (lookup_name) | |
3165 | or `unknown_type_node' (all member functions use this). */ | |
3166 | TREE_NONLOCAL_FLAG (value) = 1; | |
3167 | } | |
3168 | ||
3169 | /* Put the new contents in our envelope. */ | |
3170 | TREE_PURPOSE (class_value) = value; | |
3171 | } | |
3172 | else | |
3173 | { | |
3174 | /* See comment above for a description of envelopes. */ | |
3175 | tree envelope = tree_cons (fields, class_value, | |
3176 | closed_envelopes); | |
3177 | ||
3178 | closed_envelopes = envelope; | |
3179 | IDENTIFIER_CLASS_VALUE (DECL_NAME (fields)) = envelope; | |
3180 | } | |
3181 | } | |
3182 | } | |
3183 | ||
3184 | method_vec = CLASSTYPE_METHOD_VEC (type); | |
3185 | if (method_vec != 0) | |
3186 | { | |
3187 | /* Farm out constructors and destructors. */ | |
3188 | methods = &TREE_VEC_ELT (method_vec, 1); | |
3189 | end = TREE_VEC_END (method_vec); | |
3190 | ||
3191 | /* This does not work for multiple inheritance yet. */ | |
3192 | while (methods != end) | |
3193 | { | |
3194 | /* This will cause lookup_name to return a pointer | |
3195 | to the tree_list of possible methods of this name. | |
3196 | If the order is a problem, we can nreverse them. */ | |
3197 | tree tmp; | |
3198 | tree class_value = IDENTIFIER_CLASS_VALUE (DECL_NAME (*methods)); | |
3199 | ||
3200 | if (class_value && TREE_CODE (class_value) == TREE_LIST | |
3201 | && TREE_PURPOSE (class_value) != NULL_TREE | |
3202 | && TREE_CODE (TREE_PURPOSE (class_value)) != IDENTIFIER_NODE) | |
3203 | { | |
3204 | tree old = TREE_PURPOSE (class_value); | |
3205 | ||
3206 | maybe_push_cache_obstack (); | |
3207 | if (TREE_CODE (old) == TREE_LIST) | |
3208 | tmp = tree_cons (DECL_NAME (*methods), *methods, old); | |
3209 | else | |
3210 | { | |
3211 | /* Only complain if we shadow something we can access. */ | |
3212 | if (old | |
2986ae00 | 3213 | && warn_shadow |
8d08fdba MS |
3214 | && ((DECL_LANG_SPECIFIC (old) |
3215 | && DECL_CLASS_CONTEXT (old) == current_class_type) | |
3216 | || ! TREE_PRIVATE (old))) | |
3217 | /* Should figure out access control more accurately. */ | |
2986ae00 MS |
3218 | { |
3219 | cp_warning_at ("member `%#D' is shadowed", old); | |
3220 | cp_warning_at ("by member function `%#D'", *methods); | |
3221 | warning ("in this context"); | |
3222 | } | |
8d08fdba MS |
3223 | tmp = build_tree_list (DECL_NAME (*methods), *methods); |
3224 | } | |
3225 | pop_obstacks (); | |
3226 | ||
3227 | TREE_TYPE (tmp) = unknown_type_node; | |
3228 | #if 0 | |
3229 | TREE_OVERLOADED (tmp) = DECL_OVERLOADED (*methods); | |
3230 | #endif | |
3231 | TREE_NONLOCAL_FLAG (tmp) = 1; | |
3232 | ||
3233 | /* Put the new contents in our envelope. */ | |
3234 | TREE_PURPOSE (class_value) = tmp; | |
3235 | } | |
3236 | else | |
3237 | { | |
3238 | maybe_push_cache_obstack (); | |
3239 | tmp = build_tree_list (DECL_NAME (*methods), *methods); | |
3240 | pop_obstacks (); | |
3241 | ||
3242 | TREE_TYPE (tmp) = unknown_type_node; | |
3243 | #if 0 | |
3244 | TREE_OVERLOADED (tmp) = DECL_OVERLOADED (*methods); | |
3245 | #endif | |
3246 | TREE_NONLOCAL_FLAG (tmp) = 1; | |
3247 | ||
3248 | /* See comment above for a description of envelopes. */ | |
3249 | closed_envelopes = tree_cons (tmp, class_value, | |
3250 | closed_envelopes); | |
3251 | IDENTIFIER_CLASS_VALUE (DECL_NAME (*methods)) = closed_envelopes; | |
3252 | } | |
3253 | #if 0 | |
3254 | tmp = *methods; | |
3255 | while (tmp != 0) | |
3256 | { | |
3257 | DECL_PUBLIC (tmp) = 0; | |
3258 | DECL_PROTECTED (tmp) = 0; | |
3259 | DECL_PRIVATE (tmp) = 0; | |
3260 | tmp = DECL_CHAIN (tmp); | |
3261 | } | |
3262 | #endif | |
3263 | ||
3264 | methods++; | |
3265 | } | |
3266 | } | |
3267 | SET_BINFO_MARKED (binfo); | |
3268 | } | |
3269 | ||
3270 | /* Consolidate unique (by name) member functions. */ | |
3271 | static void | |
3272 | dfs_compress_decls (binfo) | |
3273 | tree binfo; | |
3274 | { | |
3275 | tree type = BINFO_TYPE (binfo); | |
3276 | tree method_vec = CLASSTYPE_METHOD_VEC (type); | |
3277 | ||
3278 | if (method_vec != 0) | |
3279 | { | |
3280 | /* Farm out constructors and destructors. */ | |
3281 | tree *methods = &TREE_VEC_ELT (method_vec, 1); | |
3282 | tree *end = TREE_VEC_END (method_vec); | |
3283 | ||
3284 | for (; methods != end; methods++) | |
3285 | { | |
3286 | /* This is known to be an envelope of the kind described before | |
3287 | dfs_pushdecls. */ | |
3288 | tree class_value = IDENTIFIER_CLASS_VALUE (DECL_NAME (*methods)); | |
3289 | tree tmp = TREE_PURPOSE (class_value); | |
3290 | ||
3291 | /* This was replaced in scope by somebody else. Just leave it | |
3292 | alone. */ | |
3293 | if (TREE_CODE (tmp) != TREE_LIST) | |
3294 | continue; | |
3295 | ||
3296 | if (TREE_CHAIN (tmp) == NULL_TREE | |
3297 | && TREE_VALUE (tmp) | |
3298 | && DECL_CHAIN (TREE_VALUE (tmp)) == NULL_TREE) | |
3299 | { | |
3300 | TREE_PURPOSE (class_value) = TREE_VALUE (tmp); | |
3301 | } | |
3302 | } | |
3303 | } | |
3304 | CLEAR_BINFO_MARKED (binfo); | |
3305 | } | |
3306 | ||
3307 | /* When entering the scope of a class, we cache all of the | |
3308 | fields that that class provides within its inheritance | |
3309 | lattice. Where ambiguities result, we mark them | |
3310 | with `error_mark_node' so that if they are encountered | |
3311 | without explicit qualification, we can emit an error | |
3312 | message. */ | |
3313 | void | |
3314 | push_class_decls (type) | |
3315 | tree type; | |
3316 | { | |
3317 | tree id; | |
3318 | struct obstack *ambient_obstack = current_obstack; | |
3319 | ||
3320 | #if 0 | |
3321 | tree tags = CLASSTYPE_TAGS (type); | |
3322 | ||
3323 | while (tags) | |
3324 | { | |
3325 | tree code_type_node; | |
3326 | tree tag; | |
3327 | ||
3328 | switch (TREE_CODE (TREE_VALUE (tags))) | |
3329 | { | |
3330 | case ENUMERAL_TYPE: | |
3331 | code_type_node = enum_type_node; | |
3332 | break; | |
3333 | case RECORD_TYPE: | |
3334 | code_type_node = record_type_node; | |
3335 | break; | |
3336 | case CLASS_TYPE: | |
3337 | code_type_node = class_type_node; | |
3338 | break; | |
3339 | case UNION_TYPE: | |
3340 | code_type_node = union_type_node; | |
3341 | break; | |
3342 | default: | |
3343 | my_friendly_abort (297); | |
3344 | } | |
3345 | tag = xref_tag (code_type_node, TREE_PURPOSE (tags), | |
3346 | TYPE_BINFO_BASETYPE (TREE_VALUE (tags), 0), 0); | |
3347 | #if 0 /* not yet, should get fixed properly later */ | |
3348 | pushdecl (make_type_decl (TREE_PURPOSE (tags), TREE_VALUE (tags))); | |
3349 | #else | |
3350 | pushdecl (build_decl (TYPE_DECL, TREE_PURPOSE (tags), TREE_VALUE (tags))); | |
3351 | #endif | |
3352 | } | |
3353 | #endif | |
3354 | ||
3355 | search_stack = push_search_level (search_stack, &search_obstack); | |
3356 | ||
3357 | id = TYPE_IDENTIFIER (type); | |
a28e3c7f | 3358 | #if 0 |
8d08fdba MS |
3359 | if (IDENTIFIER_TEMPLATE (id) != 0) |
3360 | { | |
8d08fdba MS |
3361 | tree tmpl = IDENTIFIER_TEMPLATE (id); |
3362 | push_template_decls (DECL_ARGUMENTS (TREE_PURPOSE (tmpl)), | |
3363 | TREE_VALUE (tmpl), 1); | |
8d08fdba MS |
3364 | overload_template_name (id, 1); |
3365 | } | |
a28e3c7f | 3366 | #endif |
8d08fdba MS |
3367 | |
3368 | /* Push class fields into CLASS_VALUE scope, and mark. */ | |
3369 | dfs_walk (TYPE_BINFO (type), dfs_pushdecls, unmarkedp); | |
3370 | ||
3371 | /* Compress fields which have only a single entry | |
3372 | by a given name, and unmark. */ | |
3373 | dfs_walk (TYPE_BINFO (type), dfs_compress_decls, markedp); | |
3374 | ||
3375 | /* Open up all the closed envelopes and push the contained decls into | |
3376 | class scope. */ | |
3377 | while (closed_envelopes) | |
3378 | { | |
3379 | tree new = TREE_PURPOSE (closed_envelopes); | |
3380 | tree id; | |
3381 | ||
3382 | /* This is messy because the class value may be a *_DECL, or a | |
3383 | TREE_LIST of overloaded *_DECLs or even a TREE_LIST of ambiguous | |
3384 | *_DECLs. The name is stored at different places in these three | |
3385 | cases. */ | |
3386 | if (TREE_CODE (new) == TREE_LIST) | |
3387 | { | |
3388 | if (TREE_PURPOSE (new) != NULL_TREE) | |
3389 | id = TREE_PURPOSE (new); | |
3390 | else | |
3391 | { | |
3392 | tree node = TREE_VALUE (new); | |
3393 | ||
3394 | while (TREE_CODE (node) == TREE_LIST) | |
3395 | node = TREE_VALUE (node); | |
3396 | id = DECL_NAME (node); | |
3397 | } | |
3398 | } | |
3399 | else | |
3400 | id = DECL_NAME (new); | |
3401 | ||
3402 | /* Install the original class value in order to make | |
3403 | pushdecl_class_level work correctly. */ | |
3404 | IDENTIFIER_CLASS_VALUE (id) = TREE_VALUE (closed_envelopes); | |
3405 | if (TREE_CODE (new) == TREE_LIST) | |
3406 | push_class_level_binding (id, new); | |
3407 | else | |
3408 | pushdecl_class_level (new); | |
3409 | closed_envelopes = TREE_CHAIN (closed_envelopes); | |
3410 | } | |
3411 | current_obstack = ambient_obstack; | |
3412 | } | |
3413 | ||
3414 | /* Here's a subroutine we need because C lacks lambdas. */ | |
3415 | static void | |
3416 | dfs_unuse_fields (binfo) | |
3417 | tree binfo; | |
3418 | { | |
3419 | tree type = TREE_TYPE (binfo); | |
3420 | tree fields; | |
3421 | ||
3422 | for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields)) | |
3423 | { | |
3424 | if (TREE_CODE (fields) != FIELD_DECL) | |
3425 | continue; | |
3426 | ||
3427 | TREE_USED (fields) = 0; | |
3428 | if (DECL_NAME (fields) == NULL_TREE | |
3429 | && TREE_CODE (TREE_TYPE (fields)) == UNION_TYPE) | |
3430 | unuse_fields (TREE_TYPE (fields)); | |
3431 | } | |
3432 | } | |
3433 | ||
3434 | void | |
3435 | unuse_fields (type) | |
3436 | tree type; | |
3437 | { | |
3438 | dfs_walk (TYPE_BINFO (type), dfs_unuse_fields, unmarkedp); | |
3439 | } | |
3440 | ||
3441 | void | |
3442 | pop_class_decls (type) | |
3443 | tree type; | |
3444 | { | |
3445 | /* We haven't pushed a search level when dealing with cached classes, | |
3446 | so we'd better not try to pop it. */ | |
3447 | if (search_stack) | |
3448 | search_stack = pop_search_level (search_stack); | |
3449 | } | |
3450 | ||
8d08fdba MS |
3451 | void |
3452 | print_search_statistics () | |
3453 | { | |
3454 | #ifdef GATHER_STATISTICS | |
3455 | if (flag_memoize_lookups) | |
3456 | { | |
3457 | fprintf (stderr, "%d memoized contexts saved\n", | |
3458 | n_contexts_saved); | |
3459 | fprintf (stderr, "%d local tree nodes made\n", my_tree_node_counter); | |
3460 | fprintf (stderr, "%d local hash nodes made\n", my_memoized_entry_counter); | |
3461 | fprintf (stderr, "fields statistics:\n"); | |
3462 | fprintf (stderr, " memoized finds = %d; rejects = %d; (searches = %d)\n", | |
3463 | memoized_fast_finds[0], memoized_fast_rejects[0], | |
3464 | memoized_fields_searched[0]); | |
3465 | fprintf (stderr, " memoized_adds = %d\n", memoized_adds[0]); | |
3466 | fprintf (stderr, "fnfields statistics:\n"); | |
3467 | fprintf (stderr, " memoized finds = %d; rejects = %d; (searches = %d)\n", | |
3468 | memoized_fast_finds[1], memoized_fast_rejects[1], | |
3469 | memoized_fields_searched[1]); | |
3470 | fprintf (stderr, " memoized_adds = %d\n", memoized_adds[1]); | |
3471 | } | |
3472 | fprintf (stderr, "%d fields searched in %d[%d] calls to lookup_field[_1]\n", | |
3473 | n_fields_searched, n_calls_lookup_field, n_calls_lookup_field_1); | |
3474 | fprintf (stderr, "%d fnfields searched in %d calls to lookup_fnfields\n", | |
3475 | n_outer_fields_searched, n_calls_lookup_fnfields); | |
3476 | fprintf (stderr, "%d calls to get_base_type\n", n_calls_get_base_type); | |
3477 | #else | |
3478 | fprintf (stderr, "no search statistics\n"); | |
3479 | #endif | |
3480 | } | |
3481 | ||
3482 | void | |
3483 | init_search_processing () | |
3484 | { | |
3485 | gcc_obstack_init (&search_obstack); | |
3486 | gcc_obstack_init (&type_obstack); | |
3487 | gcc_obstack_init (&type_obstack_entries); | |
3488 | ||
3489 | /* This gives us room to build our chains of basetypes, | |
3490 | whether or not we decide to memoize them. */ | |
3491 | type_stack = push_type_level (0, &type_obstack); | |
3492 | _vptr_name = get_identifier ("_vptr"); | |
3493 | } | |
3494 | ||
3495 | void | |
3496 | reinit_search_statistics () | |
3497 | { | |
3498 | my_memoized_entry_counter = 0; | |
3499 | memoized_fast_finds[0] = 0; | |
3500 | memoized_fast_finds[1] = 0; | |
3501 | memoized_adds[0] = 0; | |
3502 | memoized_adds[1] = 0; | |
3503 | memoized_fast_rejects[0] = 0; | |
3504 | memoized_fast_rejects[1] = 0; | |
3505 | memoized_fields_searched[0] = 0; | |
3506 | memoized_fields_searched[1] = 0; | |
3507 | n_fields_searched = 0; | |
3508 | n_calls_lookup_field = 0, n_calls_lookup_field_1 = 0; | |
3509 | n_calls_lookup_fnfields = 0, n_calls_lookup_fnfields_1 = 0; | |
3510 | n_calls_get_base_type = 0; | |
3511 | n_outer_fields_searched = 0; | |
3512 | n_contexts_saved = 0; | |
3513 | } | |
e1cd6e56 MS |
3514 | |
3515 | static tree conversions; | |
3516 | static void | |
3517 | add_conversions (binfo) | |
3518 | tree binfo; | |
3519 | { | |
3520 | tree tmp = CLASSTYPE_FIRST_CONVERSION (BINFO_TYPE (binfo)); | |
3521 | for (; tmp && IDENTIFIER_TYPENAME_P (DECL_NAME (tmp)); | |
3522 | tmp = TREE_CHAIN (tmp)) | |
3523 | conversions = tree_cons (DECL_NAME (tmp), TREE_TYPE (TREE_TYPE (tmp)), | |
3524 | conversions); | |
3525 | } | |
3526 | ||
3527 | tree | |
3528 | lookup_conversions (type) | |
3529 | tree type; | |
3530 | { | |
3531 | conversions = NULL_TREE; | |
3532 | dfs_walk (TYPE_BINFO (type), add_conversions, 0); | |
3533 | return conversions; | |
3534 | } |