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eefe9a99 JH |
1 | /* Basic IPA utilities for type inheritance graph construction and |
2 | devirtualization. | |
5624e564 | 3 | Copyright (C) 2013-2015 Free Software Foundation, Inc. |
eefe9a99 JH |
4 | Contributed by Jan Hubicka |
5 | ||
6 | This file is part of GCC. | |
7 | ||
8 | GCC is free software; you can redistribute it and/or modify it under | |
9 | the terms of the GNU General Public License as published by the Free | |
10 | Software Foundation; either version 3, or (at your option) any later | |
11 | version. | |
12 | ||
13 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 | for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with GCC; see the file COPYING3. If not see | |
20 | <http://www.gnu.org/licenses/>. */ | |
21 | ||
d6ae9a6d | 22 | /* Brief vocabulary: |
eefe9a99 JH |
23 | ODR = One Definition Rule |
24 | In short, the ODR states that: | |
25 | 1 In any translation unit, a template, type, function, or object can | |
26 | have no more than one definition. Some of these can have any number | |
27 | of declarations. A definition provides an instance. | |
28 | 2 In the entire program, an object or non-inline function cannot have | |
29 | more than one definition; if an object or function is used, it must | |
30 | have exactly one definition. You can declare an object or function | |
31 | that is never used, in which case you don't have to provide | |
32 | a definition. In no event can there be more than one definition. | |
33 | 3 Some things, like types, templates, and extern inline functions, can | |
34 | be defined in more than one translation unit. For a given entity, | |
35 | each definition must be the same. Non-extern objects and functions | |
36 | in different translation units are different entities, even if their | |
37 | names and types are the same. | |
38 | ||
39 | OTR = OBJ_TYPE_REF | |
0e1474e5 | 40 | This is the Gimple representation of type information of a polymorphic call. |
eefe9a99 JH |
41 | It contains two parameters: |
42 | otr_type is a type of class whose method is called. | |
0e1474e5 | 43 | otr_token is the index into virtual table where address is taken. |
eefe9a99 JH |
44 | |
45 | BINFO | |
46 | This is the type inheritance information attached to each tree | |
d6ae9a6d | 47 | RECORD_TYPE by the C++ frontend. It provides information about base |
eefe9a99 JH |
48 | types and virtual tables. |
49 | ||
50 | BINFO is linked to the RECORD_TYPE by TYPE_BINFO. | |
51 | BINFO also links to its type by BINFO_TYPE and to the virtual table by | |
52 | BINFO_VTABLE. | |
53 | ||
54 | Base types of a given type are enumerated by BINFO_BASE_BINFO | |
55 | vector. Members of this vectors are not BINFOs associated | |
56 | with a base type. Rather they are new copies of BINFOs | |
57 | (base BINFOs). Their virtual tables may differ from | |
0e1474e5 | 58 | virtual table of the base type. Also BINFO_OFFSET specifies |
eefe9a99 JH |
59 | offset of the base within the type. |
60 | ||
61 | In the case of single inheritance, the virtual table is shared | |
62 | and BINFO_VTABLE of base BINFO is NULL. In the case of multiple | |
63 | inheritance the individual virtual tables are pointer to by | |
609570b4 | 64 | BINFO_VTABLE of base binfos (that differs of BINFO_VTABLE of |
eefe9a99 JH |
65 | binfo associated to the base type). |
66 | ||
67 | BINFO lookup for a given base type and offset can be done by | |
68 | get_binfo_at_offset. It returns proper BINFO whose virtual table | |
69 | can be used for lookup of virtual methods associated with the | |
70 | base type. | |
71 | ||
72 | token | |
73 | This is an index of virtual method in virtual table associated | |
74 | to the type defining it. Token can be looked up from OBJ_TYPE_REF | |
0e1474e5 | 75 | or from DECL_VINDEX of a given virtual table. |
eefe9a99 JH |
76 | |
77 | polymorphic (indirect) call | |
d6ae9a6d | 78 | This is callgraph representation of virtual method call. Every |
eefe9a99 JH |
79 | polymorphic call contains otr_type and otr_token taken from |
80 | original OBJ_TYPE_REF at callgraph construction time. | |
81 | ||
82 | What we do here: | |
83 | ||
84 | build_type_inheritance_graph triggers a construction of the type inheritance | |
85 | graph. | |
86 | ||
87 | We reconstruct it based on types of methods we see in the unit. | |
88 | This means that the graph is not complete. Types with no methods are not | |
0e1474e5 | 89 | inserted into the graph. Also types without virtual methods are not |
eefe9a99 | 90 | represented at all, though it may be easy to add this. |
609570b4 | 91 | |
eefe9a99 JH |
92 | The inheritance graph is represented as follows: |
93 | ||
94 | Vertices are structures odr_type. Every odr_type may correspond | |
95 | to one or more tree type nodes that are equivalent by ODR rule. | |
96 | (the multiple type nodes appear only with linktime optimization) | |
97 | ||
0e1474e5 | 98 | Edges are represented by odr_type->base and odr_type->derived_types. |
eefe9a99 JH |
99 | At the moment we do not track offsets of types for multiple inheritance. |
100 | Adding this is easy. | |
101 | ||
102 | possible_polymorphic_call_targets returns, given an parameters found in | |
103 | indirect polymorphic edge all possible polymorphic call targets of the call. | |
bbc9396b JH |
104 | |
105 | pass_ipa_devirt performs simple speculative devirtualization. | |
eefe9a99 JH |
106 | */ |
107 | ||
108 | #include "config.h" | |
109 | #include "system.h" | |
110 | #include "coretypes.h" | |
111 | #include "tm.h" | |
40e23961 MC |
112 | #include "hash-set.h" |
113 | #include "machmode.h" | |
114 | #include "hash-map.h" | |
115 | #include "vec.h" | |
116 | #include "double-int.h" | |
117 | #include "input.h" | |
118 | #include "alias.h" | |
119 | #include "symtab.h" | |
120 | #include "wide-int.h" | |
121 | #include "inchash.h" | |
4d648807 | 122 | #include "tree.h" |
40e23961 | 123 | #include "fold-const.h" |
d8a2d370 DN |
124 | #include "print-tree.h" |
125 | #include "calls.h" | |
60393bbc AM |
126 | #include "predict.h" |
127 | #include "basic-block.h" | |
c582198b AM |
128 | #include "is-a.h" |
129 | #include "plugin-api.h" | |
c582198b | 130 | #include "hard-reg-set.h" |
c582198b AM |
131 | #include "function.h" |
132 | #include "ipa-ref.h" | |
eefe9a99 | 133 | #include "cgraph.h" |
36566b39 PK |
134 | #include "hashtab.h" |
135 | #include "rtl.h" | |
136 | #include "flags.h" | |
137 | #include "statistics.h" | |
138 | #include "real.h" | |
139 | #include "fixed-value.h" | |
140 | #include "insn-config.h" | |
141 | #include "expmed.h" | |
142 | #include "dojump.h" | |
143 | #include "explow.h" | |
144 | #include "emit-rtl.h" | |
145 | #include "varasm.h" | |
146 | #include "stmt.h" | |
d8a2d370 | 147 | #include "expr.h" |
eefe9a99 | 148 | #include "tree-pass.h" |
eefe9a99 JH |
149 | #include "target.h" |
150 | #include "hash-table.h" | |
151 | #include "tree-pretty-print.h" | |
152 | #include "ipa-utils.h" | |
2fb9a547 AM |
153 | #include "tree-ssa-alias.h" |
154 | #include "internal-fn.h" | |
155 | #include "gimple-fold.h" | |
156 | #include "gimple-expr.h" | |
eefe9a99 | 157 | #include "gimple.h" |
c582198b | 158 | #include "alloc-pool.h" |
dd912cb8 | 159 | #include "symbol-summary.h" |
c582198b | 160 | #include "ipa-prop.h" |
bbc9396b | 161 | #include "ipa-inline.h" |
61a74079 | 162 | #include "diagnostic.h" |
68377e53 | 163 | #include "tree-dfa.h" |
ec77d61f | 164 | #include "demangle.h" |
2b5f0895 | 165 | #include "dbgcnt.h" |
7d0aa05b | 166 | #include "gimple-pretty-print.h" |
c59f7203 JH |
167 | #include "stor-layout.h" |
168 | #include "intl.h" | |
169 | ||
2c132d34 JH |
170 | /* Hash based set of pairs of types. */ |
171 | typedef struct | |
172 | { | |
173 | tree first; | |
174 | tree second; | |
175 | } type_pair; | |
176 | ||
177 | struct pair_traits : default_hashset_traits | |
178 | { | |
179 | static hashval_t | |
180 | hash (type_pair p) | |
181 | { | |
182 | return TYPE_UID (p.first) ^ TYPE_UID (p.second); | |
183 | } | |
184 | static bool | |
185 | is_empty (type_pair p) | |
186 | { | |
187 | return p.first == NULL; | |
188 | } | |
189 | static bool | |
190 | is_deleted (type_pair p ATTRIBUTE_UNUSED) | |
191 | { | |
192 | return false; | |
193 | } | |
194 | static bool | |
195 | equal (const type_pair &a, const type_pair &b) | |
196 | { | |
197 | return a.first==b.first && a.second == b.second; | |
198 | } | |
199 | static void | |
200 | mark_empty (type_pair &e) | |
201 | { | |
202 | e.first = NULL; | |
203 | } | |
204 | }; | |
205 | ||
6e2830c3 | 206 | static bool odr_types_equivalent_p (tree, tree, bool, bool *, |
2c132d34 | 207 | hash_set<type_pair,pair_traits> *); |
ec77d61f JH |
208 | |
209 | static bool odr_violation_reported = false; | |
68377e53 | 210 | |
eefe9a99 | 211 | |
0e1474e5 | 212 | /* Pointer set of all call targets appearing in the cache. */ |
6e2830c3 | 213 | static hash_set<cgraph_node *> *cached_polymorphic_call_targets; |
0e1474e5 | 214 | |
eefe9a99 | 215 | /* The node of type inheritance graph. For each type unique in |
609570b4 | 216 | One Definition Rule (ODR) sense, we produce one node linking all |
eefe9a99 JH |
217 | main variants of types equivalent to it, bases and derived types. */ |
218 | ||
219 | struct GTY(()) odr_type_d | |
220 | { | |
eefe9a99 JH |
221 | /* leader type. */ |
222 | tree type; | |
d6ae9a6d | 223 | /* All bases; built only for main variants of types. */ |
eefe9a99 | 224 | vec<odr_type> GTY((skip)) bases; |
d6ae9a6d SL |
225 | /* All derived types with virtual methods seen in unit; |
226 | built only for main variants of types. */ | |
eefe9a99 | 227 | vec<odr_type> GTY((skip)) derived_types; |
0e1474e5 | 228 | |
61a74079 JH |
229 | /* All equivalent types, if more than one. */ |
230 | vec<tree, va_gc> *types; | |
231 | /* Set of all equivalent types, if NON-NULL. */ | |
6e2830c3 | 232 | hash_set<tree> * GTY((skip)) types_set; |
61a74079 | 233 | |
0e1474e5 JH |
234 | /* Unique ID indexing the type in odr_types array. */ |
235 | int id; | |
eefe9a99 JH |
236 | /* Is it in anonymous namespace? */ |
237 | bool anonymous_namespace; | |
2d1644bf JH |
238 | /* Do we know about all derivations of given type? */ |
239 | bool all_derivations_known; | |
549bcbd1 JH |
240 | /* Did we report ODR violation here? */ |
241 | bool odr_violated; | |
eefe9a99 JH |
242 | }; |
243 | ||
2d1644bf JH |
244 | /* Return TRUE if all derived types of T are known and thus |
245 | we may consider the walk of derived type complete. | |
246 | ||
247 | This is typically true only for final anonymous namespace types and types | |
248 | defined within functions (that may be COMDAT and thus shared across units, | |
249 | but with the same set of derived types). */ | |
250 | ||
aa803cc7 JH |
251 | bool |
252 | type_all_derivations_known_p (const_tree t) | |
2d1644bf JH |
253 | { |
254 | if (TYPE_FINAL_P (t)) | |
255 | return true; | |
256 | if (flag_ltrans) | |
257 | return false; | |
5ce97055 JH |
258 | /* Non-C++ types may have IDENTIFIER_NODE here, do not crash. */ |
259 | if (!TYPE_NAME (t) || TREE_CODE (TYPE_NAME (t)) != TYPE_DECL) | |
260 | return true; | |
2d1644bf JH |
261 | if (type_in_anonymous_namespace_p (t)) |
262 | return true; | |
263 | return (decl_function_context (TYPE_NAME (t)) != NULL); | |
264 | } | |
265 | ||
d6ae9a6d | 266 | /* Return TRUE if type's constructors are all visible. */ |
2d1644bf JH |
267 | |
268 | static bool | |
269 | type_all_ctors_visible_p (tree t) | |
270 | { | |
271 | return !flag_ltrans | |
3dafb85c | 272 | && symtab->state >= CONSTRUCTION |
2d1644bf JH |
273 | /* We can not always use type_all_derivations_known_p. |
274 | For function local types we must assume case where | |
609570b4 | 275 | the function is COMDAT and shared in between units. |
2d1644bf JH |
276 | |
277 | TODO: These cases are quite easy to get, but we need | |
278 | to keep track of C++ privatizing via -Wno-weak | |
279 | as well as the IPA privatizing. */ | |
280 | && type_in_anonymous_namespace_p (t); | |
281 | } | |
282 | ||
283 | /* Return TRUE if type may have instance. */ | |
284 | ||
285 | static bool | |
286 | type_possibly_instantiated_p (tree t) | |
287 | { | |
288 | tree vtable; | |
289 | varpool_node *vnode; | |
290 | ||
291 | /* TODO: Add abstract types here. */ | |
292 | if (!type_all_ctors_visible_p (t)) | |
293 | return true; | |
294 | ||
295 | vtable = BINFO_VTABLE (TYPE_BINFO (t)); | |
296 | if (TREE_CODE (vtable) == POINTER_PLUS_EXPR) | |
297 | vtable = TREE_OPERAND (TREE_OPERAND (vtable, 0), 0); | |
9041d2e6 | 298 | vnode = varpool_node::get (vtable); |
2d1644bf JH |
299 | return vnode && vnode->definition; |
300 | } | |
301 | ||
609570b4 JH |
302 | /* Hash used to unify ODR types based on their mangled name and for anonymous |
303 | namespace types. */ | |
eefe9a99 | 304 | |
609570b4 | 305 | struct odr_name_hasher |
eefe9a99 JH |
306 | { |
307 | typedef odr_type_d value_type; | |
308 | typedef union tree_node compare_type; | |
309 | static inline hashval_t hash (const value_type *); | |
310 | static inline bool equal (const value_type *, const compare_type *); | |
311 | static inline void remove (value_type *); | |
312 | }; | |
313 | ||
609570b4 JH |
314 | /* Has used to unify ODR types based on their associated virtual table. |
315 | This hash is needed to keep -fno-lto-odr-type-merging to work and contains | |
316 | only polymorphic types. Types with mangled names are inserted to both. */ | |
317 | ||
318 | struct odr_vtable_hasher:odr_name_hasher | |
319 | { | |
320 | static inline hashval_t hash (const value_type *); | |
321 | static inline bool equal (const value_type *, const compare_type *); | |
322 | }; | |
323 | ||
549bcbd1 JH |
324 | /* Return type that was declared with T's name so that T is an |
325 | qualified variant of it. */ | |
326 | ||
327 | static inline tree | |
328 | main_odr_variant (const_tree t) | |
329 | { | |
330 | if (TYPE_NAME (t) && TREE_CODE (TYPE_NAME (t)) == TYPE_DECL) | |
331 | return TREE_TYPE (TYPE_NAME (t)); | |
332 | /* Unnamed types and non-C++ produced types can be compared by variants. */ | |
333 | else | |
334 | return TYPE_MAIN_VARIANT (t); | |
335 | } | |
336 | ||
609570b4 JH |
337 | static bool |
338 | can_be_name_hashed_p (tree t) | |
339 | { | |
340 | return (!in_lto_p || type_in_anonymous_namespace_p (t) | |
341 | || (TYPE_NAME (t) && DECL_ASSEMBLER_NAME_SET_P (TYPE_NAME (t)))); | |
342 | } | |
343 | ||
344 | /* Hash type by its ODR name. */ | |
eefe9a99 | 345 | |
549bcbd1 | 346 | static hashval_t |
609570b4 | 347 | hash_odr_name (const_tree t) |
eefe9a99 | 348 | { |
549bcbd1 | 349 | gcc_checking_assert (main_odr_variant (t) == t); |
eefe9a99 JH |
350 | |
351 | /* If not in LTO, all main variants are unique, so we can do | |
352 | pointer hash. */ | |
353 | if (!in_lto_p) | |
354 | return htab_hash_pointer (t); | |
355 | ||
356 | /* Anonymous types are unique. */ | |
357 | if (type_in_anonymous_namespace_p (t)) | |
358 | return htab_hash_pointer (t); | |
359 | ||
609570b4 JH |
360 | gcc_checking_assert (TYPE_NAME (t) |
361 | && DECL_ASSEMBLER_NAME_SET_P (TYPE_NAME (t))); | |
362 | return IDENTIFIER_HASH_VALUE (DECL_ASSEMBLER_NAME (TYPE_NAME (t))); | |
363 | } | |
1ee85ee1 | 364 | |
609570b4 | 365 | /* Return the computed hashcode for ODR_TYPE. */ |
61a74079 | 366 | |
609570b4 JH |
367 | inline hashval_t |
368 | odr_name_hasher::hash (const value_type *odr_type) | |
369 | { | |
370 | return hash_odr_name (odr_type->type); | |
371 | } | |
372 | ||
373 | static bool | |
374 | can_be_vtable_hashed_p (tree t) | |
375 | { | |
376 | /* vtable hashing can distinguish only main variants. */ | |
377 | if (TYPE_MAIN_VARIANT (t) != t) | |
378 | return false; | |
379 | /* Anonymous namespace types are always handled by name hash. */ | |
380 | if (type_in_anonymous_namespace_p (t)) | |
381 | return false; | |
382 | return (TREE_CODE (t) == RECORD_TYPE | |
383 | && TYPE_BINFO (t) && BINFO_VTABLE (TYPE_BINFO (t))); | |
384 | } | |
385 | ||
386 | /* Hash type by assembler name of its vtable. */ | |
387 | ||
388 | static hashval_t | |
389 | hash_odr_vtable (const_tree t) | |
390 | { | |
391 | tree v = BINFO_VTABLE (TYPE_BINFO (TYPE_MAIN_VARIANT (t))); | |
392 | inchash::hash hstate; | |
393 | ||
394 | gcc_checking_assert (in_lto_p); | |
395 | gcc_checking_assert (!type_in_anonymous_namespace_p (t)); | |
396 | gcc_checking_assert (TREE_CODE (t) == RECORD_TYPE | |
397 | && TYPE_BINFO (t) && BINFO_VTABLE (TYPE_BINFO (t))); | |
398 | gcc_checking_assert (main_odr_variant (t) == t); | |
61a74079 | 399 | |
609570b4 JH |
400 | if (TREE_CODE (v) == POINTER_PLUS_EXPR) |
401 | { | |
402 | add_expr (TREE_OPERAND (v, 1), hstate); | |
403 | v = TREE_OPERAND (TREE_OPERAND (v, 0), 0); | |
61a74079 JH |
404 | } |
405 | ||
609570b4 JH |
406 | hstate.add_wide_int (IDENTIFIER_HASH_VALUE (DECL_ASSEMBLER_NAME (v))); |
407 | return hstate.end (); | |
eefe9a99 JH |
408 | } |
409 | ||
410 | /* Return the computed hashcode for ODR_TYPE. */ | |
411 | ||
412 | inline hashval_t | |
609570b4 | 413 | odr_vtable_hasher::hash (const value_type *odr_type) |
eefe9a99 | 414 | { |
609570b4 | 415 | return hash_odr_vtable (odr_type->type); |
eefe9a99 JH |
416 | } |
417 | ||
549bcbd1 JH |
418 | /* For languages with One Definition Rule, work out if |
419 | types are the same based on their name. | |
609570b4 | 420 | |
d6ae9a6d | 421 | This is non-trivial for LTO where minor differences in |
549bcbd1 JH |
422 | the type representation may have prevented type merging |
423 | to merge two copies of otherwise equivalent type. | |
424 | ||
425 | Until we start streaming mangled type names, this function works | |
609570b4 JH |
426 | only for polymorphic types. |
427 | ||
428 | When STRICT is true, we compare types by their names for purposes of | |
429 | ODR violation warnings. When strict is false, we consider variants | |
430 | equivalent, becuase it is all that matters for devirtualization machinery. | |
431 | */ | |
549bcbd1 JH |
432 | |
433 | bool | |
609570b4 | 434 | types_same_for_odr (const_tree type1, const_tree type2, bool strict) |
549bcbd1 JH |
435 | { |
436 | gcc_checking_assert (TYPE_P (type1) && TYPE_P (type2)); | |
437 | ||
438 | type1 = main_odr_variant (type1); | |
439 | type2 = main_odr_variant (type2); | |
609570b4 JH |
440 | if (!strict) |
441 | { | |
442 | type1 = TYPE_MAIN_VARIANT (type1); | |
443 | type2 = TYPE_MAIN_VARIANT (type2); | |
444 | } | |
549bcbd1 JH |
445 | |
446 | if (type1 == type2) | |
447 | return true; | |
448 | ||
449 | if (!in_lto_p) | |
450 | return false; | |
451 | ||
452 | /* Check for anonymous namespaces. Those have !TREE_PUBLIC | |
453 | on the corresponding TYPE_STUB_DECL. */ | |
454 | if (type_in_anonymous_namespace_p (type1) | |
455 | || type_in_anonymous_namespace_p (type2)) | |
456 | return false; | |
457 | ||
01a92e70 | 458 | |
1ee85ee1 JH |
459 | /* ODR name of the type is set in DECL_ASSEMBLER_NAME of its TYPE_NAME. |
460 | ||
d6ae9a6d | 461 | Ideally we should never need types without ODR names here. It can however |
1ee85ee1 | 462 | happen in two cases: |
549bcbd1 | 463 | |
1ee85ee1 JH |
464 | 1) for builtin types that are not streamed but rebuilt in lto/lto-lang.c |
465 | Here testing for equivalence is safe, since their MAIN_VARIANTs are | |
466 | unique. | |
467 | 2) for units streamed with -fno-lto-odr-type-merging. Here we can't | |
468 | establish precise ODR equivalency, but for correctness we care only | |
469 | about equivalency on complete polymorphic types. For these we can | |
470 | compare assembler names of their virtual tables. */ | |
471 | if ((!TYPE_NAME (type1) || !DECL_ASSEMBLER_NAME_SET_P (TYPE_NAME (type1))) | |
472 | || (!TYPE_NAME (type2) || !DECL_ASSEMBLER_NAME_SET_P (TYPE_NAME (type2)))) | |
549bcbd1 | 473 | { |
d6ae9a6d SL |
474 | /* See if types are obviously different (i.e. different codes |
475 | or polymorphic wrt non-polymorphic). This is not strictly correct | |
1ee85ee1 JH |
476 | for ODR violating programs, but we can't do better without streaming |
477 | ODR names. */ | |
478 | if (TREE_CODE (type1) != TREE_CODE (type2)) | |
479 | return false; | |
480 | if (TREE_CODE (type1) == RECORD_TYPE | |
609570b4 JH |
481 | && (TYPE_BINFO (type1) == NULL_TREE) |
482 | != (TYPE_BINFO (type1) == NULL_TREE)) | |
1ee85ee1 JH |
483 | return false; |
484 | if (TREE_CODE (type1) == RECORD_TYPE && TYPE_BINFO (type1) | |
485 | && (BINFO_VTABLE (TYPE_BINFO (type1)) == NULL_TREE) | |
486 | != (BINFO_VTABLE (TYPE_BINFO (type2)) == NULL_TREE)) | |
487 | return false; | |
488 | ||
d6ae9a6d SL |
489 | /* At the moment we have no way to establish ODR equivalence at LTO |
490 | other than comparing virtual table pointers of polymorphic types. | |
1ee85ee1 JH |
491 | Eventually we should start saving mangled names in TYPE_NAME. |
492 | Then this condition will become non-trivial. */ | |
493 | ||
494 | if (TREE_CODE (type1) == RECORD_TYPE | |
495 | && TYPE_BINFO (type1) && TYPE_BINFO (type2) | |
496 | && BINFO_VTABLE (TYPE_BINFO (type1)) | |
497 | && BINFO_VTABLE (TYPE_BINFO (type2))) | |
498 | { | |
499 | tree v1 = BINFO_VTABLE (TYPE_BINFO (type1)); | |
500 | tree v2 = BINFO_VTABLE (TYPE_BINFO (type2)); | |
501 | gcc_assert (TREE_CODE (v1) == POINTER_PLUS_EXPR | |
502 | && TREE_CODE (v2) == POINTER_PLUS_EXPR); | |
503 | return (operand_equal_p (TREE_OPERAND (v1, 1), | |
504 | TREE_OPERAND (v2, 1), 0) | |
505 | && DECL_ASSEMBLER_NAME | |
506 | (TREE_OPERAND (TREE_OPERAND (v1, 0), 0)) | |
507 | == DECL_ASSEMBLER_NAME | |
508 | (TREE_OPERAND (TREE_OPERAND (v2, 0), 0))); | |
509 | } | |
510 | gcc_unreachable (); | |
549bcbd1 | 511 | } |
1ee85ee1 JH |
512 | return (DECL_ASSEMBLER_NAME (TYPE_NAME (type1)) |
513 | == DECL_ASSEMBLER_NAME (TYPE_NAME (type2))); | |
549bcbd1 JH |
514 | } |
515 | ||
a1981458 JH |
516 | /* Return true if we can decide on ODR equivalency. |
517 | ||
518 | In non-LTO it is always decide, in LTO however it depends in the type has | |
609570b4 JH |
519 | ODR info attached. |
520 | ||
521 | When STRICT is false, compare main variants. */ | |
a1981458 | 522 | |
aa803cc7 | 523 | bool |
609570b4 | 524 | types_odr_comparable (tree t1, tree t2, bool strict) |
a1981458 JH |
525 | { |
526 | return (!in_lto_p | |
609570b4 JH |
527 | || (strict ? main_odr_variant (t1) == main_odr_variant (t2) |
528 | : TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2)) | |
a1981458 JH |
529 | || (odr_type_p (t1) && odr_type_p (t2)) |
530 | || (TREE_CODE (t1) == RECORD_TYPE && TREE_CODE (t2) == RECORD_TYPE | |
531 | && TYPE_BINFO (t1) && TYPE_BINFO (t2) | |
532 | && polymorphic_type_binfo_p (TYPE_BINFO (t1)) | |
533 | && polymorphic_type_binfo_p (TYPE_BINFO (t2)))); | |
534 | } | |
535 | ||
536 | /* Return true if T1 and T2 are ODR equivalent. If ODR equivalency is not | |
537 | known, be conservative and return false. */ | |
538 | ||
aa803cc7 | 539 | bool |
a1981458 JH |
540 | types_must_be_same_for_odr (tree t1, tree t2) |
541 | { | |
542 | if (types_odr_comparable (t1, t2)) | |
543 | return types_same_for_odr (t1, t2); | |
544 | else | |
609570b4 | 545 | return TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2); |
a1981458 | 546 | } |
549bcbd1 | 547 | |
0e1474e5 | 548 | /* Compare types T1 and T2 and return true if they are |
eefe9a99 JH |
549 | equivalent. */ |
550 | ||
551 | inline bool | |
609570b4 | 552 | odr_name_hasher::equal (const value_type *o1, const compare_type *t2) |
eefe9a99 | 553 | { |
609570b4 | 554 | tree t1 = o1->type; |
eefe9a99 | 555 | |
549bcbd1 | 556 | gcc_checking_assert (main_odr_variant (t2) == t2); |
609570b4 JH |
557 | gcc_checking_assert (main_odr_variant (t1) == t1); |
558 | if (t1 == t2) | |
eefe9a99 JH |
559 | return true; |
560 | if (!in_lto_p) | |
561 | return false; | |
609570b4 JH |
562 | /* Check for anonymous namespaces. Those have !TREE_PUBLIC |
563 | on the corresponding TYPE_STUB_DECL. */ | |
564 | if (type_in_anonymous_namespace_p (t1) | |
565 | || type_in_anonymous_namespace_p (t2)) | |
566 | return false; | |
567 | gcc_checking_assert (DECL_ASSEMBLER_NAME (TYPE_NAME (t1))); | |
568 | gcc_checking_assert (DECL_ASSEMBLER_NAME (TYPE_NAME (t2))); | |
569 | return (DECL_ASSEMBLER_NAME (TYPE_NAME (t1)) | |
570 | == DECL_ASSEMBLER_NAME (TYPE_NAME (t2))); | |
571 | } | |
572 | ||
573 | /* Compare types T1 and T2 and return true if they are | |
574 | equivalent. */ | |
575 | ||
576 | inline bool | |
577 | odr_vtable_hasher::equal (const value_type *o1, const compare_type *t2) | |
578 | { | |
579 | tree t1 = o1->type; | |
580 | ||
581 | gcc_checking_assert (main_odr_variant (t2) == t2); | |
582 | gcc_checking_assert (main_odr_variant (t1) == t1); | |
583 | gcc_checking_assert (in_lto_p); | |
584 | t1 = TYPE_MAIN_VARIANT (t1); | |
585 | t2 = TYPE_MAIN_VARIANT (t2); | |
586 | if (t1 == t2) | |
587 | return true; | |
588 | tree v1 = BINFO_VTABLE (TYPE_BINFO (t1)); | |
589 | tree v2 = BINFO_VTABLE (TYPE_BINFO (t2)); | |
590 | return (operand_equal_p (TREE_OPERAND (v1, 1), | |
591 | TREE_OPERAND (v2, 1), 0) | |
592 | && DECL_ASSEMBLER_NAME | |
593 | (TREE_OPERAND (TREE_OPERAND (v1, 0), 0)) | |
594 | == DECL_ASSEMBLER_NAME | |
595 | (TREE_OPERAND (TREE_OPERAND (v2, 0), 0))); | |
eefe9a99 JH |
596 | } |
597 | ||
0e1474e5 | 598 | /* Free ODR type V. */ |
eefe9a99 JH |
599 | |
600 | inline void | |
609570b4 | 601 | odr_name_hasher::remove (value_type *v) |
eefe9a99 JH |
602 | { |
603 | v->bases.release (); | |
604 | v->derived_types.release (); | |
61a74079 | 605 | if (v->types_set) |
6e2830c3 | 606 | delete v->types_set; |
eefe9a99 JH |
607 | ggc_free (v); |
608 | } | |
609 | ||
d6ae9a6d | 610 | /* ODR type hash used to look up ODR type based on tree type node. */ |
eefe9a99 | 611 | |
609570b4 | 612 | typedef hash_table<odr_name_hasher> odr_hash_type; |
c203e8a7 | 613 | static odr_hash_type *odr_hash; |
609570b4 JH |
614 | typedef hash_table<odr_vtable_hasher> odr_vtable_hash_type; |
615 | static odr_vtable_hash_type *odr_vtable_hash; | |
eefe9a99 JH |
616 | |
617 | /* ODR types are also stored into ODR_TYPE vector to allow consistent | |
618 | walking. Bases appear before derived types. Vector is garbage collected | |
619 | so we won't end up visiting empty types. */ | |
620 | ||
621 | static GTY(()) vec <odr_type, va_gc> *odr_types_ptr; | |
622 | #define odr_types (*odr_types_ptr) | |
623 | ||
c7e1befa JH |
624 | /* Set TYPE_BINFO of TYPE and its variants to BINFO. */ |
625 | void | |
626 | set_type_binfo (tree type, tree binfo) | |
627 | { | |
628 | for (; type; type = TYPE_NEXT_VARIANT (type)) | |
629 | if (COMPLETE_TYPE_P (type)) | |
630 | TYPE_BINFO (type) = binfo; | |
631 | else | |
632 | gcc_assert (!TYPE_BINFO (type)); | |
633 | } | |
634 | ||
c59f7203 JH |
635 | /* Compare T2 and T2 based on name or structure. */ |
636 | ||
637 | static bool | |
88b16508 JH |
638 | odr_subtypes_equivalent_p (tree t1, tree t2, |
639 | hash_set<type_pair,pair_traits> *visited) | |
c59f7203 JH |
640 | { |
641 | bool an1, an2; | |
642 | ||
643 | /* This can happen in incomplete types that should be handled earlier. */ | |
644 | gcc_assert (t1 && t2); | |
645 | ||
646 | t1 = main_odr_variant (t1); | |
647 | t2 = main_odr_variant (t2); | |
648 | if (t1 == t2) | |
649 | return true; | |
c59f7203 JH |
650 | |
651 | /* Anonymous namespace types must match exactly. */ | |
652 | an1 = type_in_anonymous_namespace_p (t1); | |
653 | an2 = type_in_anonymous_namespace_p (t2); | |
654 | if (an1 != an2 || an1) | |
655 | return false; | |
656 | ||
9d8fc086 JH |
657 | /* For ODR types be sure to compare their names. |
658 | To support -wno-odr-type-merging we allow one type to be non-ODR | |
659 | and other ODR even though it is a violation. */ | |
609570b4 | 660 | if (types_odr_comparable (t1, t2, true)) |
c59f7203 | 661 | { |
609570b4 | 662 | if (!types_same_for_odr (t1, t2, true)) |
2c132d34 JH |
663 | return false; |
664 | /* Limit recursion: If subtypes are ODR types and we know | |
665 | that they are same, be happy. */ | |
666 | if (!get_odr_type (t1, true)->odr_violated) | |
667 | return true; | |
c59f7203 | 668 | } |
1ee85ee1 | 669 | |
d6ae9a6d | 670 | /* Component types, builtins and possibly violating ODR types |
2c132d34 JH |
671 | have to be compared structurally. */ |
672 | if (TREE_CODE (t1) != TREE_CODE (t2)) | |
673 | return false; | |
674 | if ((TYPE_NAME (t1) == NULL_TREE) != (TYPE_NAME (t2) == NULL_TREE)) | |
675 | return false; | |
676 | if (TYPE_NAME (t1) && DECL_NAME (TYPE_NAME (t1)) != DECL_NAME (TYPE_NAME (t2))) | |
677 | return false; | |
678 | ||
679 | type_pair pair={t1,t2}; | |
680 | if (TYPE_UID (t1) > TYPE_UID (t2)) | |
681 | { | |
682 | pair.first = t2; | |
683 | pair.second = t1; | |
684 | } | |
685 | if (visited->add (pair)) | |
686 | return true; | |
687 | return odr_types_equivalent_p (t1, t2, false, NULL, visited); | |
c59f7203 JH |
688 | } |
689 | ||
56b1f114 | 690 | /* Compare two virtual tables, PREVAILING and VTABLE and output ODR |
d6ae9a6d | 691 | violation warnings. */ |
56b1f114 JH |
692 | |
693 | void | |
694 | compare_virtual_tables (varpool_node *prevailing, varpool_node *vtable) | |
695 | { | |
696 | int n1, n2; | |
697 | if (DECL_VIRTUAL_P (prevailing->decl) != DECL_VIRTUAL_P (vtable->decl)) | |
698 | { | |
699 | odr_violation_reported = true; | |
700 | if (DECL_VIRTUAL_P (prevailing->decl)) | |
701 | { | |
702 | varpool_node *tmp = prevailing; | |
703 | prevailing = vtable; | |
704 | vtable = tmp; | |
705 | } | |
88b16508 JH |
706 | if (warning_at (DECL_SOURCE_LOCATION |
707 | (TYPE_NAME (DECL_CONTEXT (vtable->decl))), | |
56b1f114 JH |
708 | OPT_Wodr, |
709 | "virtual table of type %qD violates one definition rule", | |
710 | DECL_CONTEXT (vtable->decl))) | |
711 | inform (DECL_SOURCE_LOCATION (prevailing->decl), | |
712 | "variable of same assembler name as the virtual table is " | |
713 | "defined in another translation unit"); | |
714 | return; | |
715 | } | |
716 | if (!prevailing->definition || !vtable->definition) | |
717 | return; | |
718 | for (n1 = 0, n2 = 0; true; n1++, n2++) | |
719 | { | |
720 | struct ipa_ref *ref1, *ref2; | |
721 | bool end1, end2; | |
88b16508 | 722 | |
56b1f114 JH |
723 | end1 = !prevailing->iterate_reference (n1, ref1); |
724 | end2 = !vtable->iterate_reference (n2, ref2); | |
88b16508 JH |
725 | |
726 | /* !DECL_VIRTUAL_P means RTTI entry; | |
727 | We warn when RTTI is lost because non-RTTI previals; we silently | |
728 | accept the other case. */ | |
729 | while (!end2 | |
730 | && (end1 | |
731 | || (DECL_ASSEMBLER_NAME (ref1->referred->decl) | |
732 | != DECL_ASSEMBLER_NAME (ref2->referred->decl) | |
733 | && DECL_VIRTUAL_P (ref1->referred->decl))) | |
734 | && !DECL_VIRTUAL_P (ref2->referred->decl)) | |
56b1f114 | 735 | { |
88b16508 JH |
736 | if (warning_at (DECL_SOURCE_LOCATION |
737 | (TYPE_NAME (DECL_CONTEXT (vtable->decl))), 0, | |
56b1f114 JH |
738 | "virtual table of type %qD contains RTTI information", |
739 | DECL_CONTEXT (vtable->decl))) | |
740 | { | |
88b16508 JH |
741 | inform (DECL_SOURCE_LOCATION |
742 | (TYPE_NAME (DECL_CONTEXT (prevailing->decl))), | |
743 | "but is prevailed by one without from other translation " | |
744 | "unit"); | |
745 | inform (DECL_SOURCE_LOCATION | |
746 | (TYPE_NAME (DECL_CONTEXT (prevailing->decl))), | |
56b1f114 JH |
747 | "RTTI will not work on this type"); |
748 | } | |
749 | n2++; | |
750 | end2 = !vtable->iterate_reference (n2, ref2); | |
751 | } | |
88b16508 JH |
752 | while (!end1 |
753 | && (end2 | |
754 | || (DECL_ASSEMBLER_NAME (ref2->referred->decl) | |
755 | != DECL_ASSEMBLER_NAME (ref1->referred->decl) | |
756 | && DECL_VIRTUAL_P (ref2->referred->decl))) | |
757 | && !DECL_VIRTUAL_P (ref1->referred->decl)) | |
56b1f114 JH |
758 | { |
759 | n1++; | |
760 | end1 = !vtable->iterate_reference (n1, ref1); | |
761 | } | |
88b16508 JH |
762 | |
763 | /* Finished? */ | |
764 | if (end1 && end2) | |
765 | { | |
766 | /* Extra paranoia; compare the sizes. We do not have information | |
767 | about virtual inheritance offsets, so just be sure that these | |
609570b4 | 768 | match. |
88b16508 JH |
769 | Do this as very last check so the not very informative error |
770 | is not output too often. */ | |
771 | if (DECL_SIZE (prevailing->decl) != DECL_SIZE (vtable->decl)) | |
772 | { | |
773 | if (warning_at (DECL_SOURCE_LOCATION | |
774 | (TYPE_NAME (DECL_CONTEXT (vtable->decl))), 0, | |
775 | "virtual table of type %qD violates " | |
776 | "one definition rule ", | |
777 | DECL_CONTEXT (vtable->decl))) | |
778 | { | |
609570b4 | 779 | inform (DECL_SOURCE_LOCATION |
88b16508 JH |
780 | (TYPE_NAME (DECL_CONTEXT (prevailing->decl))), |
781 | "the conflicting type defined in another translation " | |
782 | "unit has virtual table of different size"); | |
783 | } | |
784 | } | |
785 | return; | |
786 | } | |
787 | ||
788 | if (!end1 && !end2) | |
789 | { | |
790 | if (DECL_ASSEMBLER_NAME (ref1->referred->decl) | |
791 | == DECL_ASSEMBLER_NAME (ref2->referred->decl)) | |
792 | continue; | |
793 | ||
794 | /* If the loops above stopped on non-virtual pointer, we have | |
795 | mismatch in RTTI information mangling. */ | |
796 | if (!DECL_VIRTUAL_P (ref1->referred->decl) | |
797 | && !DECL_VIRTUAL_P (ref2->referred->decl)) | |
798 | { | |
799 | if (warning_at (DECL_SOURCE_LOCATION | |
800 | (TYPE_NAME (DECL_CONTEXT (vtable->decl))), 0, | |
801 | "virtual table of type %qD violates " | |
802 | "one definition rule ", | |
803 | DECL_CONTEXT (vtable->decl))) | |
804 | { | |
609570b4 | 805 | inform (DECL_SOURCE_LOCATION |
88b16508 JH |
806 | (TYPE_NAME (DECL_CONTEXT (prevailing->decl))), |
807 | "the conflicting type defined in another translation " | |
609570b4 | 808 | "unit with different RTTI information"); |
88b16508 JH |
809 | } |
810 | return; | |
811 | } | |
812 | /* At this point both REF1 and REF2 points either to virtual table | |
813 | or virtual method. If one points to virtual table and other to | |
814 | method we can complain the same way as if one table was shorter | |
815 | than other pointing out the extra method. */ | |
816 | gcc_assert (DECL_VIRTUAL_P (ref1->referred->decl) | |
817 | && (TREE_CODE (ref1->referred->decl) == FUNCTION_DECL | |
818 | || TREE_CODE (ref1->referred->decl) == VAR_DECL)); | |
819 | gcc_assert (DECL_VIRTUAL_P (ref2->referred->decl) | |
820 | && (TREE_CODE (ref2->referred->decl) == FUNCTION_DECL | |
821 | || TREE_CODE (ref2->referred->decl) == VAR_DECL)); | |
822 | if (TREE_CODE (ref1->referred->decl) | |
823 | != TREE_CODE (ref2->referred->decl)) | |
824 | { | |
825 | if (TREE_CODE (ref1->referred->decl) == VAR_DECL) | |
826 | end1 = true; | |
827 | else if (TREE_CODE (ref2->referred->decl) == VAR_DECL) | |
828 | end2 = true; | |
829 | } | |
830 | } | |
831 | ||
832 | /* Complain about size mismatch. Either we have too many virutal | |
833 | functions or too many virtual table pointers. */ | |
56b1f114 JH |
834 | if (end1 || end2) |
835 | { | |
836 | if (end1) | |
837 | { | |
838 | varpool_node *tmp = prevailing; | |
839 | prevailing = vtable; | |
840 | vtable = tmp; | |
841 | ref1 = ref2; | |
842 | } | |
843 | if (warning_at (DECL_SOURCE_LOCATION | |
844 | (TYPE_NAME (DECL_CONTEXT (vtable->decl))), 0, | |
845 | "virtual table of type %qD violates " | |
846 | "one definition rule", | |
847 | DECL_CONTEXT (vtable->decl))) | |
848 | { | |
88b16508 JH |
849 | if (TREE_CODE (ref1->referring->decl) == FUNCTION_DECL) |
850 | { | |
851 | inform (DECL_SOURCE_LOCATION | |
852 | (TYPE_NAME (DECL_CONTEXT (prevailing->decl))), | |
853 | "the conflicting type defined in another translation " | |
854 | "unit"); | |
855 | inform (DECL_SOURCE_LOCATION | |
856 | (TYPE_NAME (DECL_CONTEXT (ref1->referring->decl))), | |
857 | "contains additional virtual method %qD", | |
858 | ref1->referred->decl); | |
859 | } | |
860 | else | |
861 | { | |
862 | inform (DECL_SOURCE_LOCATION | |
863 | (TYPE_NAME (DECL_CONTEXT (prevailing->decl))), | |
864 | "the conflicting type defined in another translation " | |
865 | "unit has virtual table table with more entries"); | |
866 | } | |
56b1f114 JH |
867 | } |
868 | return; | |
869 | } | |
88b16508 JH |
870 | |
871 | /* And in the last case we have either mistmatch in between two virtual | |
872 | methods or two virtual table pointers. */ | |
873 | if (warning_at (DECL_SOURCE_LOCATION | |
874 | (TYPE_NAME (DECL_CONTEXT (vtable->decl))), 0, | |
875 | "virtual table of type %qD violates " | |
876 | "one definition rule ", | |
877 | DECL_CONTEXT (vtable->decl))) | |
56b1f114 | 878 | { |
88b16508 | 879 | if (TREE_CODE (ref1->referred->decl) == FUNCTION_DECL) |
56b1f114 | 880 | { |
609570b4 | 881 | inform (DECL_SOURCE_LOCATION |
56b1f114 JH |
882 | (TYPE_NAME (DECL_CONTEXT (prevailing->decl))), |
883 | "the conflicting type defined in another translation " | |
884 | "unit"); | |
88b16508 JH |
885 | gcc_assert (TREE_CODE (ref2->referred->decl) |
886 | == FUNCTION_DECL); | |
56b1f114 JH |
887 | inform (DECL_SOURCE_LOCATION (ref1->referred->decl), |
888 | "virtual method %qD", ref1->referred->decl); | |
889 | inform (DECL_SOURCE_LOCATION (ref2->referred->decl), | |
890 | "ought to match virtual method %qD but does not", | |
891 | ref2->referred->decl); | |
56b1f114 | 892 | } |
88b16508 | 893 | else |
609570b4 | 894 | inform (DECL_SOURCE_LOCATION |
88b16508 JH |
895 | (TYPE_NAME (DECL_CONTEXT (prevailing->decl))), |
896 | "the conflicting type defined in another translation " | |
897 | "unit has virtual table table with different contents"); | |
898 | return; | |
56b1f114 JH |
899 | } |
900 | } | |
901 | } | |
902 | ||
c59f7203 JH |
903 | /* Output ODR violation warning about T1 and T2 with REASON. |
904 | Display location of ST1 and ST2 if REASON speaks about field or | |
905 | method of the type. | |
906 | If WARN is false, do nothing. Set WARNED if warning was indeed | |
907 | output. */ | |
908 | ||
909 | void | |
910 | warn_odr (tree t1, tree t2, tree st1, tree st2, | |
911 | bool warn, bool *warned, const char *reason) | |
912 | { | |
913 | tree decl2 = TYPE_NAME (t2); | |
88b16508 JH |
914 | if (warned) |
915 | *warned = false; | |
c59f7203 JH |
916 | |
917 | if (!warn) | |
918 | return; | |
919 | if (!warning_at (DECL_SOURCE_LOCATION (TYPE_NAME (t1)), OPT_Wodr, | |
920 | "type %qT violates one definition rule", | |
921 | t1)) | |
922 | return; | |
2c132d34 | 923 | if (!st1 && !st2) |
c59f7203 | 924 | ; |
2c132d34 JH |
925 | /* For FIELD_DECL support also case where one of fields is |
926 | NULL - this is used when the structures have mismatching number of | |
927 | elements. */ | |
928 | else if (!st1 || TREE_CODE (st1) == FIELD_DECL) | |
c59f7203 JH |
929 | { |
930 | inform (DECL_SOURCE_LOCATION (decl2), | |
931 | "a different type is defined in another translation unit"); | |
2c132d34 JH |
932 | if (!st1) |
933 | { | |
934 | st1 = st2; | |
935 | st2 = NULL; | |
936 | } | |
c59f7203 JH |
937 | inform (DECL_SOURCE_LOCATION (st1), |
938 | "the first difference of corresponding definitions is field %qD", | |
939 | st1); | |
2c132d34 JH |
940 | if (st2) |
941 | decl2 = st2; | |
c59f7203 JH |
942 | } |
943 | else if (TREE_CODE (st1) == FUNCTION_DECL) | |
944 | { | |
945 | inform (DECL_SOURCE_LOCATION (decl2), | |
946 | "a different type is defined in another translation unit"); | |
947 | inform (DECL_SOURCE_LOCATION (st1), | |
948 | "the first difference of corresponding definitions is method %qD", | |
949 | st1); | |
950 | decl2 = st2; | |
951 | } | |
952 | else | |
953 | return; | |
954 | inform (DECL_SOURCE_LOCATION (decl2), reason); | |
955 | ||
956 | if (warned) | |
957 | *warned = true; | |
958 | } | |
959 | ||
960 | /* We already warned about ODR mismatch. T1 and T2 ought to be equivalent | |
961 | because they are used on same place in ODR matching types. | |
962 | They are not; inform the user. */ | |
963 | ||
964 | void | |
965 | warn_types_mismatch (tree t1, tree t2) | |
966 | { | |
967 | if (!TYPE_NAME (t1) || !TYPE_NAME (t2)) | |
968 | return; | |
969 | /* In Firefox it is a common bug to have same types but in | |
970 | different namespaces. Be a bit more informative on | |
971 | this. */ | |
972 | if (TYPE_CONTEXT (t1) && TYPE_CONTEXT (t2) | |
973 | && (((TREE_CODE (TYPE_CONTEXT (t1)) == NAMESPACE_DECL) | |
974 | != (TREE_CODE (TYPE_CONTEXT (t2)) == NAMESPACE_DECL)) | |
975 | || (TREE_CODE (TYPE_CONTEXT (t1)) == NAMESPACE_DECL | |
976 | && (DECL_NAME (TYPE_CONTEXT (t1)) != | |
977 | DECL_NAME (TYPE_CONTEXT (t2)))))) | |
978 | inform (DECL_SOURCE_LOCATION (TYPE_NAME (t1)), | |
979 | "type %qT should match type %qT but is defined " | |
980 | "in different namespace ", | |
981 | t1, t2); | |
982 | else | |
983 | inform (DECL_SOURCE_LOCATION (TYPE_NAME (t1)), | |
984 | "type %qT should match type %qT", | |
985 | t1, t2); | |
986 | inform (DECL_SOURCE_LOCATION (TYPE_NAME (t2)), | |
987 | "the incompatible type is defined here"); | |
988 | } | |
989 | ||
990 | /* Compare T1 and T2, report ODR violations if WARN is true and set | |
991 | WARNED to true if anything is reported. Return true if types match. | |
992 | If true is returned, the types are also compatible in the sense of | |
993 | gimple_canonical_types_compatible_p. */ | |
994 | ||
995 | static bool | |
7d8adcba JH |
996 | odr_types_equivalent_p (tree t1, tree t2, bool warn, bool *warned, |
997 | hash_set<type_pair,pair_traits> *visited) | |
c59f7203 JH |
998 | { |
999 | /* Check first for the obvious case of pointer identity. */ | |
1000 | if (t1 == t2) | |
1001 | return true; | |
1002 | gcc_assert (!type_in_anonymous_namespace_p (t1)); | |
1003 | gcc_assert (!type_in_anonymous_namespace_p (t2)); | |
1004 | ||
1005 | /* Can't be the same type if the types don't have the same code. */ | |
1006 | if (TREE_CODE (t1) != TREE_CODE (t2)) | |
1007 | { | |
1008 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1009 | G_("a different type is defined in another translation unit")); | |
1010 | return false; | |
1011 | } | |
1012 | ||
1013 | if (TYPE_QUALS (t1) != TYPE_QUALS (t2)) | |
1014 | { | |
1015 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1016 | G_("a type with different qualifiers is defined in another " | |
1017 | "translation unit")); | |
1018 | return false; | |
1019 | } | |
1020 | ||
1021 | if (comp_type_attributes (t1, t2) != 1) | |
1022 | { | |
1023 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1024 | G_("a type with attributes " | |
1025 | "is defined in another translation unit")); | |
1026 | return false; | |
1027 | } | |
1028 | ||
88b16508 JH |
1029 | if (TREE_CODE (t1) == ENUMERAL_TYPE |
1030 | && TYPE_VALUES (t1) && TYPE_VALUES (t2)) | |
c59f7203 JH |
1031 | { |
1032 | tree v1, v2; | |
1033 | for (v1 = TYPE_VALUES (t1), v2 = TYPE_VALUES (t2); | |
1034 | v1 && v2 ; v1 = TREE_CHAIN (v1), v2 = TREE_CHAIN (v2)) | |
1035 | { | |
1036 | if (TREE_PURPOSE (v1) != TREE_PURPOSE (v2)) | |
1037 | { | |
1038 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1039 | G_("an enum with different value name" | |
1040 | " is defined in another translation unit")); | |
1041 | return false; | |
1042 | } | |
1043 | if (TREE_VALUE (v1) != TREE_VALUE (v2) | |
1044 | && !operand_equal_p (DECL_INITIAL (TREE_VALUE (v1)), | |
1045 | DECL_INITIAL (TREE_VALUE (v2)), 0)) | |
1046 | { | |
1047 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1048 | G_("an enum with different values is defined" | |
1049 | " in another translation unit")); | |
1050 | return false; | |
1051 | } | |
1052 | } | |
1053 | if (v1 || v2) | |
1054 | { | |
1055 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1056 | G_("an enum with mismatching number of values " | |
1057 | "is defined in another translation unit")); | |
1058 | return false; | |
1059 | } | |
1060 | } | |
1061 | ||
1062 | /* Non-aggregate types can be handled cheaply. */ | |
1063 | if (INTEGRAL_TYPE_P (t1) | |
1064 | || SCALAR_FLOAT_TYPE_P (t1) | |
1065 | || FIXED_POINT_TYPE_P (t1) | |
1066 | || TREE_CODE (t1) == VECTOR_TYPE | |
1067 | || TREE_CODE (t1) == COMPLEX_TYPE | |
1068 | || TREE_CODE (t1) == OFFSET_TYPE | |
1069 | || POINTER_TYPE_P (t1)) | |
1070 | { | |
1071 | if (TYPE_PRECISION (t1) != TYPE_PRECISION (t2)) | |
1072 | { | |
1073 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1074 | G_("a type with different precision is defined " | |
1075 | "in another translation unit")); | |
1076 | return false; | |
1077 | } | |
1078 | if (TYPE_UNSIGNED (t1) != TYPE_UNSIGNED (t2)) | |
1079 | { | |
1080 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1081 | G_("a type with different signedness is defined " | |
1082 | "in another translation unit")); | |
1083 | return false; | |
1084 | } | |
1085 | ||
1086 | if (TREE_CODE (t1) == INTEGER_TYPE | |
1087 | && TYPE_STRING_FLAG (t1) != TYPE_STRING_FLAG (t2)) | |
1088 | { | |
1089 | /* char WRT uint_8? */ | |
1090 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1091 | G_("a different type is defined in another " | |
1092 | "translation unit")); | |
1093 | return false; | |
1094 | } | |
1095 | ||
1096 | /* For canonical type comparisons we do not want to build SCCs | |
1097 | so we cannot compare pointed-to types. But we can, for now, | |
1098 | require the same pointed-to type kind and match what | |
1099 | useless_type_conversion_p would do. */ | |
1100 | if (POINTER_TYPE_P (t1)) | |
1101 | { | |
1102 | if (TYPE_ADDR_SPACE (TREE_TYPE (t1)) | |
1103 | != TYPE_ADDR_SPACE (TREE_TYPE (t2))) | |
1104 | { | |
1105 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1106 | G_("it is defined as a pointer in different address " | |
1107 | "space in another translation unit")); | |
1108 | return false; | |
1109 | } | |
1110 | ||
1111 | if (!odr_subtypes_equivalent_p (TREE_TYPE (t1), TREE_TYPE (t2), visited)) | |
1112 | { | |
1113 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1114 | G_("it is defined as a pointer to different type " | |
1115 | "in another translation unit")); | |
1116 | if (warn && warned) | |
1117 | warn_types_mismatch (TREE_TYPE (t1), TREE_TYPE (t2)); | |
1118 | return false; | |
1119 | } | |
1120 | } | |
1121 | ||
c59f7203 JH |
1122 | if ((TREE_CODE (t1) == VECTOR_TYPE || TREE_CODE (t1) == COMPLEX_TYPE) |
1123 | && !odr_subtypes_equivalent_p (TREE_TYPE (t1), TREE_TYPE (t2), visited)) | |
1124 | { | |
1125 | /* Probably specific enough. */ | |
1126 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1127 | G_("a different type is defined " | |
1128 | "in another translation unit")); | |
1129 | if (warn && warned) | |
1130 | warn_types_mismatch (TREE_TYPE (t1), TREE_TYPE (t2)); | |
1131 | return false; | |
1132 | } | |
c59f7203 | 1133 | } |
c59f7203 | 1134 | /* Do type-specific comparisons. */ |
2c132d34 | 1135 | else switch (TREE_CODE (t1)) |
c59f7203 JH |
1136 | { |
1137 | case ARRAY_TYPE: | |
1138 | { | |
1139 | /* Array types are the same if the element types are the same and | |
1140 | the number of elements are the same. */ | |
1141 | if (!odr_subtypes_equivalent_p (TREE_TYPE (t1), TREE_TYPE (t2), visited)) | |
1142 | { | |
1143 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1144 | G_("a different type is defined in another " | |
1145 | "translation unit")); | |
1146 | if (warn && warned) | |
1147 | warn_types_mismatch (TREE_TYPE (t1), TREE_TYPE (t2)); | |
1148 | } | |
1149 | gcc_assert (TYPE_STRING_FLAG (t1) == TYPE_STRING_FLAG (t2)); | |
1150 | gcc_assert (TYPE_NONALIASED_COMPONENT (t1) | |
1151 | == TYPE_NONALIASED_COMPONENT (t2)); | |
1152 | ||
1153 | tree i1 = TYPE_DOMAIN (t1); | |
1154 | tree i2 = TYPE_DOMAIN (t2); | |
1155 | ||
1156 | /* For an incomplete external array, the type domain can be | |
1157 | NULL_TREE. Check this condition also. */ | |
1158 | if (i1 == NULL_TREE || i2 == NULL_TREE) | |
1159 | return true; | |
1160 | ||
1161 | tree min1 = TYPE_MIN_VALUE (i1); | |
1162 | tree min2 = TYPE_MIN_VALUE (i2); | |
1163 | tree max1 = TYPE_MAX_VALUE (i1); | |
1164 | tree max2 = TYPE_MAX_VALUE (i2); | |
1165 | ||
1166 | /* In C++, minimums should be always 0. */ | |
1167 | gcc_assert (min1 == min2); | |
1168 | if (!operand_equal_p (max1, max2, 0)) | |
1169 | { | |
1170 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1171 | G_("an array of different size is defined " | |
1172 | "in another translation unit")); | |
1173 | return false; | |
1174 | } | |
c59f7203 | 1175 | } |
2c132d34 | 1176 | break; |
c59f7203 JH |
1177 | |
1178 | case METHOD_TYPE: | |
1179 | case FUNCTION_TYPE: | |
1180 | /* Function types are the same if the return type and arguments types | |
1181 | are the same. */ | |
1182 | if (!odr_subtypes_equivalent_p (TREE_TYPE (t1), TREE_TYPE (t2), visited)) | |
1183 | { | |
1184 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1185 | G_("has different return value " | |
1186 | "in another translation unit")); | |
1187 | if (warn && warned) | |
1188 | warn_types_mismatch (TREE_TYPE (t1), TREE_TYPE (t2)); | |
1189 | return false; | |
1190 | } | |
1191 | ||
1192 | if (TYPE_ARG_TYPES (t1) == TYPE_ARG_TYPES (t2)) | |
1193 | return true; | |
1194 | else | |
1195 | { | |
1196 | tree parms1, parms2; | |
1197 | ||
1198 | for (parms1 = TYPE_ARG_TYPES (t1), parms2 = TYPE_ARG_TYPES (t2); | |
1199 | parms1 && parms2; | |
1200 | parms1 = TREE_CHAIN (parms1), parms2 = TREE_CHAIN (parms2)) | |
1201 | { | |
1202 | if (!odr_subtypes_equivalent_p | |
1203 | (TREE_VALUE (parms1), TREE_VALUE (parms2), visited)) | |
1204 | { | |
1205 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1206 | G_("has different parameters in another " | |
1207 | "translation unit")); | |
1208 | if (warn && warned) | |
1209 | warn_types_mismatch (TREE_VALUE (parms1), | |
1210 | TREE_VALUE (parms2)); | |
1211 | return false; | |
1212 | } | |
1213 | } | |
1214 | ||
1215 | if (parms1 || parms2) | |
1216 | { | |
1217 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1218 | G_("has different parameters " | |
1219 | "in another translation unit")); | |
1220 | return false; | |
1221 | } | |
1222 | ||
1223 | return true; | |
1224 | } | |
1225 | ||
1226 | case RECORD_TYPE: | |
1227 | case UNION_TYPE: | |
1228 | case QUAL_UNION_TYPE: | |
1229 | { | |
1230 | tree f1, f2; | |
1231 | ||
1232 | /* For aggregate types, all the fields must be the same. */ | |
1233 | if (COMPLETE_TYPE_P (t1) && COMPLETE_TYPE_P (t2)) | |
1234 | { | |
1235 | for (f1 = TYPE_FIELDS (t1), f2 = TYPE_FIELDS (t2); | |
1236 | f1 || f2; | |
1237 | f1 = TREE_CHAIN (f1), f2 = TREE_CHAIN (f2)) | |
1238 | { | |
1239 | /* Skip non-fields. */ | |
1240 | while (f1 && TREE_CODE (f1) != FIELD_DECL) | |
1241 | f1 = TREE_CHAIN (f1); | |
1242 | while (f2 && TREE_CODE (f2) != FIELD_DECL) | |
1243 | f2 = TREE_CHAIN (f2); | |
1244 | if (!f1 || !f2) | |
1245 | break; | |
88b16508 JH |
1246 | if (DECL_VIRTUAL_P (f1) != DECL_VIRTUAL_P (f2)) |
1247 | { | |
1248 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1249 | G_("a type with different virtual table pointers" | |
1250 | " is defined in another translation unit")); | |
1251 | return false; | |
1252 | } | |
c59f7203 | 1253 | if (DECL_ARTIFICIAL (f1) != DECL_ARTIFICIAL (f2)) |
88b16508 JH |
1254 | { |
1255 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1256 | G_("a type with different bases is defined " | |
1257 | "in another translation unit")); | |
1258 | return false; | |
1259 | } | |
c59f7203 JH |
1260 | if (DECL_NAME (f1) != DECL_NAME (f2) |
1261 | && !DECL_ARTIFICIAL (f1)) | |
1262 | { | |
1263 | warn_odr (t1, t2, f1, f2, warn, warned, | |
1264 | G_("a field with different name is defined " | |
1265 | "in another translation unit")); | |
1266 | return false; | |
1267 | } | |
88b16508 JH |
1268 | if (!odr_subtypes_equivalent_p (TREE_TYPE (f1), |
1269 | TREE_TYPE (f2), visited)) | |
c59f7203 | 1270 | { |
88b16508 JH |
1271 | /* Do not warn about artificial fields and just go into |
1272 | generic field mismatch warning. */ | |
c59f7203 JH |
1273 | if (DECL_ARTIFICIAL (f1)) |
1274 | break; | |
1275 | ||
1276 | warn_odr (t1, t2, f1, f2, warn, warned, | |
1277 | G_("a field of same name but different type " | |
1278 | "is defined in another translation unit")); | |
1279 | if (warn && warned) | |
1280 | warn_types_mismatch (TREE_TYPE (f1), TREE_TYPE (f2)); | |
1281 | return false; | |
1282 | } | |
1283 | if (!gimple_compare_field_offset (f1, f2)) | |
1284 | { | |
88b16508 JH |
1285 | /* Do not warn about artificial fields and just go into |
1286 | generic field mismatch warning. */ | |
c59f7203 JH |
1287 | if (DECL_ARTIFICIAL (f1)) |
1288 | break; | |
88b16508 | 1289 | warn_odr (t1, t2, f1, f2, warn, warned, |
c59f7203 JH |
1290 | G_("fields has different layout " |
1291 | "in another translation unit")); | |
1292 | return false; | |
1293 | } | |
1294 | gcc_assert (DECL_NONADDRESSABLE_P (f1) | |
1295 | == DECL_NONADDRESSABLE_P (f2)); | |
1296 | } | |
1297 | ||
1298 | /* If one aggregate has more fields than the other, they | |
1299 | are not the same. */ | |
1300 | if (f1 || f2) | |
1301 | { | |
88b16508 JH |
1302 | if ((f1 && DECL_VIRTUAL_P (f1)) || (f2 && DECL_VIRTUAL_P (f2))) |
1303 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1304 | G_("a type with different virtual table pointers" | |
1305 | " is defined in another translation unit")); | |
1306 | if ((f1 && DECL_ARTIFICIAL (f1)) | |
1307 | || (f2 && DECL_ARTIFICIAL (f2))) | |
1308 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1309 | G_("a type with different bases is defined " | |
1310 | "in another translation unit")); | |
2c132d34 JH |
1311 | else |
1312 | warn_odr (t1, t2, f1, f2, warn, warned, | |
88b16508 | 1313 | G_("a type with different number of fields " |
2c132d34 JH |
1314 | "is defined in another translation unit")); |
1315 | ||
c59f7203 JH |
1316 | return false; |
1317 | } | |
1318 | if ((TYPE_MAIN_VARIANT (t1) == t1 || TYPE_MAIN_VARIANT (t2) == t2) | |
1319 | && (TYPE_METHODS (TYPE_MAIN_VARIANT (t1)) | |
1320 | != TYPE_METHODS (TYPE_MAIN_VARIANT (t2)))) | |
1321 | { | |
1322 | for (f1 = TYPE_METHODS (TYPE_MAIN_VARIANT (t1)), | |
1323 | f2 = TYPE_METHODS (TYPE_MAIN_VARIANT (t2)); | |
1324 | f1 && f2 ; f1 = DECL_CHAIN (f1), f2 = DECL_CHAIN (f2)) | |
1325 | { | |
1326 | if (DECL_ASSEMBLER_NAME (f1) != DECL_ASSEMBLER_NAME (f2)) | |
1327 | { | |
1328 | warn_odr (t1, t2, f1, f2, warn, warned, | |
1329 | G_("a different method of same type " | |
1330 | "is defined in another translation unit")); | |
1331 | return false; | |
1332 | } | |
1333 | if (DECL_VIRTUAL_P (f1) != DECL_VIRTUAL_P (f2)) | |
1334 | { | |
1335 | warn_odr (t1, t2, f1, f2, warn, warned, | |
1336 | G_("s definition that differs by virtual " | |
1337 | "keyword in another translation unit")); | |
1338 | return false; | |
1339 | } | |
1340 | if (DECL_VINDEX (f1) != DECL_VINDEX (f2)) | |
1341 | { | |
1342 | warn_odr (t1, t2, f1, f2, warn, warned, | |
1343 | G_("virtual table layout differs in another " | |
1344 | "translation unit")); | |
1345 | return false; | |
1346 | } | |
1347 | if (odr_subtypes_equivalent_p (TREE_TYPE (f1), TREE_TYPE (f2), visited)) | |
1348 | { | |
1349 | warn_odr (t1, t2, f1, f2, warn, warned, | |
1350 | G_("method with incompatible type is defined " | |
1351 | "in another translation unit")); | |
1352 | return false; | |
1353 | } | |
1354 | } | |
1355 | if (f1 || f2) | |
1356 | { | |
1357 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1358 | G_("a type with different number of methods " | |
1359 | "is defined in another translation unit")); | |
1360 | return false; | |
1361 | } | |
1362 | } | |
c59f7203 | 1363 | } |
2c132d34 | 1364 | break; |
c59f7203 | 1365 | } |
2c132d34 JH |
1366 | case VOID_TYPE: |
1367 | break; | |
c59f7203 JH |
1368 | |
1369 | default: | |
2c132d34 | 1370 | debug_tree (t1); |
c59f7203 JH |
1371 | gcc_unreachable (); |
1372 | } | |
2c132d34 JH |
1373 | |
1374 | /* Those are better to come last as they are utterly uninformative. */ | |
1375 | if (TYPE_SIZE (t1) && TYPE_SIZE (t2) | |
1376 | && !operand_equal_p (TYPE_SIZE (t1), TYPE_SIZE (t2), 0)) | |
1377 | { | |
1378 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1379 | G_("a type with different size " | |
1380 | "is defined in another translation unit")); | |
1381 | return false; | |
1382 | } | |
1383 | if (COMPLETE_TYPE_P (t1) && COMPLETE_TYPE_P (t2) | |
1384 | && TYPE_ALIGN (t1) != TYPE_ALIGN (t2)) | |
1385 | { | |
1386 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1387 | G_("a type with different alignment " | |
1388 | "is defined in another translation unit")); | |
1389 | return false; | |
1390 | } | |
1391 | gcc_assert (!TYPE_SIZE_UNIT (t1) || !TYPE_SIZE_UNIT (t2) | |
1392 | || operand_equal_p (TYPE_SIZE_UNIT (t1), | |
1393 | TYPE_SIZE_UNIT (t2), 0)); | |
1394 | return true; | |
c59f7203 JH |
1395 | } |
1396 | ||
61a74079 JH |
1397 | /* TYPE is equivalent to VAL by ODR, but its tree representation differs |
1398 | from VAL->type. This may happen in LTO where tree merging did not merge | |
609570b4 JH |
1399 | all variants of the same type or due to ODR violation. |
1400 | ||
1401 | Analyze and report ODR violations and add type to duplicate list. | |
1402 | If TYPE is more specified than VAL->type, prevail VAL->type. Also if | |
1403 | this is first time we see definition of a class return true so the | |
1404 | base types are analyzed. */ | |
61a74079 | 1405 | |
549bcbd1 | 1406 | static bool |
61a74079 JH |
1407 | add_type_duplicate (odr_type val, tree type) |
1408 | { | |
549bcbd1 | 1409 | bool build_bases = false; |
609570b4 JH |
1410 | bool prevail = false; |
1411 | ||
61a74079 | 1412 | if (!val->types_set) |
6e2830c3 | 1413 | val->types_set = new hash_set<tree>; |
61a74079 | 1414 | |
730c436a JH |
1415 | /* Chose polymorphic type as leader (this happens only in case of ODR |
1416 | violations. */ | |
1417 | if ((TREE_CODE (type) == RECORD_TYPE && TYPE_BINFO (type) | |
1418 | && polymorphic_type_binfo_p (TYPE_BINFO (type))) | |
1419 | && (TREE_CODE (val->type) != RECORD_TYPE || !TYPE_BINFO (val->type) | |
1420 | || !polymorphic_type_binfo_p (TYPE_BINFO (val->type)))) | |
1421 | { | |
1422 | prevail = true; | |
1423 | build_bases = true; | |
1424 | } | |
549bcbd1 | 1425 | /* Always prefer complete type to be the leader. */ |
730c436a | 1426 | else if (!COMPLETE_TYPE_P (val->type) && COMPLETE_TYPE_P (type)) |
609570b4 JH |
1427 | { |
1428 | prevail = true; | |
1429 | build_bases = TYPE_BINFO (type); | |
1430 | } | |
88b16508 JH |
1431 | else if (COMPLETE_TYPE_P (val->type) && !COMPLETE_TYPE_P (type)) |
1432 | ; | |
1433 | else if (TREE_CODE (val->type) == ENUMERAL_TYPE | |
1434 | && TREE_CODE (type) == ENUMERAL_TYPE | |
1435 | && !TYPE_VALUES (val->type) && TYPE_VALUES (type)) | |
609570b4 | 1436 | prevail = true; |
88b16508 JH |
1437 | else if (TREE_CODE (val->type) == RECORD_TYPE |
1438 | && TREE_CODE (type) == RECORD_TYPE | |
1439 | && TYPE_BINFO (type) && !TYPE_BINFO (val->type)) | |
609570b4 JH |
1440 | { |
1441 | gcc_assert (!val->bases.length ()); | |
1442 | build_bases = true; | |
1443 | prevail = true; | |
1444 | } | |
88b16508 | 1445 | |
609570b4 | 1446 | if (prevail) |
549bcbd1 JH |
1447 | { |
1448 | tree tmp = type; | |
1449 | ||
549bcbd1 JH |
1450 | type = val->type; |
1451 | val->type = tmp; | |
1452 | } | |
1453 | ||
609570b4 JH |
1454 | val->types_set->add (type); |
1455 | ||
1456 | /* If we now have a mangled name, be sure to record it to val->type | |
1457 | so ODR hash can work. */ | |
1458 | ||
1459 | if (can_be_name_hashed_p (type) && !can_be_name_hashed_p (val->type)) | |
1460 | SET_DECL_ASSEMBLER_NAME (TYPE_NAME (val->type), | |
1461 | DECL_ASSEMBLER_NAME (TYPE_NAME (type))); | |
1462 | ||
1463 | bool merge = true; | |
1464 | bool base_mismatch = false; | |
1465 | unsigned int i; | |
1466 | bool warned = false; | |
1467 | hash_set<type_pair,pair_traits> visited; | |
1468 | ||
1469 | gcc_assert (in_lto_p); | |
1470 | vec_safe_push (val->types, type); | |
1471 | ||
1472 | /* First we compare memory layout. */ | |
1473 | if (!odr_types_equivalent_p (val->type, type, | |
1474 | !flag_ltrans && !val->odr_violated, | |
1475 | &warned, &visited)) | |
61a74079 | 1476 | { |
609570b4 JH |
1477 | merge = false; |
1478 | odr_violation_reported = true; | |
1479 | val->odr_violated = true; | |
1480 | if (symtab->dump_file) | |
1481 | { | |
1482 | fprintf (symtab->dump_file, "ODR violation\n"); | |
1483 | ||
1484 | print_node (symtab->dump_file, "", val->type, 0); | |
1485 | putc ('\n',symtab->dump_file); | |
1486 | print_node (symtab->dump_file, "", type, 0); | |
1487 | putc ('\n',symtab->dump_file); | |
1488 | } | |
1489 | } | |
1490 | ||
1491 | /* Next sanity check that bases are the same. If not, we will end | |
1492 | up producing wrong answers. */ | |
1493 | if (COMPLETE_TYPE_P (type) && COMPLETE_TYPE_P (val->type) | |
1494 | && TREE_CODE (val->type) == RECORD_TYPE | |
1495 | && TREE_CODE (type) == RECORD_TYPE | |
1496 | && TYPE_BINFO (val->type) && TYPE_BINFO (type)) | |
1497 | { | |
1498 | if (BINFO_N_BASE_BINFOS (TYPE_BINFO (type)) | |
1499 | != BINFO_N_BASE_BINFOS (TYPE_BINFO (val->type))) | |
1500 | { | |
1501 | if (!warned && !val->odr_violated) | |
1502 | { | |
1503 | tree extra_base; | |
1504 | warn_odr (type, val->type, NULL, NULL, !warned, &warned, | |
1505 | "a type with the same name but different " | |
1506 | "number of polymorphic bases is " | |
1507 | "defined in another translation unit"); | |
1508 | if (BINFO_N_BASE_BINFOS (TYPE_BINFO (type)) | |
1509 | > BINFO_N_BASE_BINFOS (TYPE_BINFO (val->type))) | |
1510 | extra_base = BINFO_BASE_BINFO | |
1511 | (TYPE_BINFO (type), | |
1512 | BINFO_N_BASE_BINFOS (TYPE_BINFO (val->type))); | |
1513 | else | |
1514 | extra_base = BINFO_BASE_BINFO | |
1515 | (TYPE_BINFO (val->type), | |
1516 | BINFO_N_BASE_BINFOS (TYPE_BINFO (type))); | |
9112885a JJ |
1517 | tree extra_base_type = BINFO_TYPE (extra_base); |
1518 | inform (DECL_SOURCE_LOCATION (TYPE_NAME (extra_base_type)), | |
1519 | "the extra base is defined here"); | |
609570b4 JH |
1520 | } |
1521 | base_mismatch = true; | |
1522 | } | |
1523 | else | |
1524 | for (i = 0; i < BINFO_N_BASE_BINFOS (TYPE_BINFO (type)); i++) | |
1525 | { | |
1526 | tree base1 = BINFO_BASE_BINFO (TYPE_BINFO (type), i); | |
1527 | tree base2 = BINFO_BASE_BINFO (TYPE_BINFO (val->type), i); | |
1528 | tree type1 = BINFO_TYPE (base1); | |
1529 | tree type2 = BINFO_TYPE (base2); | |
549bcbd1 | 1530 | |
609570b4 JH |
1531 | if (types_odr_comparable (type1, type2)) |
1532 | { | |
1533 | if (!types_same_for_odr (type1, type2)) | |
1534 | base_mismatch = true; | |
1535 | } | |
1536 | else | |
1537 | { | |
1538 | hash_set<type_pair,pair_traits> visited; | |
1539 | if (!odr_types_equivalent_p (type1, type2, false, NULL, | |
1540 | &visited)) | |
1541 | base_mismatch = true; | |
1542 | } | |
1543 | if (base_mismatch) | |
1544 | { | |
1545 | if (!warned && !val->odr_violated) | |
1546 | { | |
1547 | warn_odr (type, val->type, NULL, NULL, | |
1548 | !warned, &warned, | |
1549 | "a type with the same name but different base " | |
1550 | "type is defined in another translation unit"); | |
1551 | if (warned) | |
1552 | warn_types_mismatch (type1, type2); | |
1553 | } | |
1554 | break; | |
1555 | } | |
1556 | if (BINFO_OFFSET (base1) != BINFO_OFFSET (base2)) | |
1557 | { | |
1558 | base_mismatch = true; | |
1559 | if (!warned && !val->odr_violated) | |
1560 | warn_odr (type, val->type, NULL, NULL, | |
1561 | !warned, &warned, | |
1562 | "a type with the same name but different base " | |
1563 | "layout is defined in another translation unit"); | |
1564 | break; | |
1565 | } | |
1566 | /* One of bases is not of complete type. */ | |
1567 | if (!TYPE_BINFO (type1) != !TYPE_BINFO (type2)) | |
1568 | { | |
1569 | /* If we have a polymorphic type info specified for TYPE1 | |
1570 | but not for TYPE2 we possibly missed a base when recording | |
1571 | VAL->type earlier. | |
1572 | Be sure this does not happen. */ | |
1573 | gcc_assert (TYPE_BINFO (type2) | |
1574 | || !polymorphic_type_binfo_p (TYPE_BINFO (type1)) | |
730c436a JH |
1575 | || build_bases |
1576 | || val->odr_violated); | |
609570b4 JH |
1577 | break; |
1578 | } | |
1579 | /* One base is polymorphic and the other not. | |
1580 | This ought to be diagnosed earlier, but do not ICE in the | |
1581 | checking bellow. */ | |
1582 | else if (TYPE_BINFO (type1) | |
1583 | && polymorphic_type_binfo_p (TYPE_BINFO (type1)) | |
1584 | != polymorphic_type_binfo_p (TYPE_BINFO (type2))) | |
1585 | { | |
1586 | gcc_assert (val->odr_violated); | |
1587 | base_mismatch = true; | |
1588 | break; | |
1589 | } | |
1590 | } | |
1591 | #ifdef ENABLE_CHECKING | |
1592 | /* Sanity check that all bases will be build same way again. */ | |
1593 | if (!base_mismatch && val->bases.length ()) | |
1594 | { | |
1595 | unsigned int num_poly_bases = 0; | |
1596 | unsigned int j; | |
61a74079 | 1597 | |
609570b4 JH |
1598 | for (i = 0; i < BINFO_N_BASE_BINFOS (TYPE_BINFO (type)); i++) |
1599 | if (polymorphic_type_binfo_p (BINFO_BASE_BINFO | |
1600 | (TYPE_BINFO (type), i))) | |
1601 | num_poly_bases++; | |
1602 | gcc_assert (num_poly_bases == val->bases.length ()); | |
1603 | for (j = 0, i = 0; i < BINFO_N_BASE_BINFOS (TYPE_BINFO (type)); | |
1604 | i++) | |
1605 | if (polymorphic_type_binfo_p (BINFO_BASE_BINFO | |
1606 | (TYPE_BINFO (type), i))) | |
1607 | { | |
1608 | odr_type base = get_odr_type | |
1609 | (BINFO_TYPE | |
1610 | (BINFO_BASE_BINFO (TYPE_BINFO (type), | |
1611 | i)), | |
1612 | true); | |
1613 | gcc_assert (val->bases[j] == base); | |
1614 | j++; | |
1615 | } | |
1616 | } | |
1617 | #endif | |
1618 | if (base_mismatch) | |
61a74079 JH |
1619 | { |
1620 | merge = false; | |
ec77d61f | 1621 | odr_violation_reported = true; |
549bcbd1 | 1622 | val->odr_violated = true; |
609570b4 | 1623 | |
3dafb85c | 1624 | if (symtab->dump_file) |
61a74079 | 1625 | { |
609570b4 | 1626 | fprintf (symtab->dump_file, "ODR base violation\n"); |
61a74079 | 1627 | |
3dafb85c ML |
1628 | print_node (symtab->dump_file, "", val->type, 0); |
1629 | putc ('\n',symtab->dump_file); | |
1630 | print_node (symtab->dump_file, "", type, 0); | |
1631 | putc ('\n',symtab->dump_file); | |
61a74079 JH |
1632 | } |
1633 | } | |
609570b4 | 1634 | } |
61a74079 | 1635 | |
609570b4 JH |
1636 | /* Regularize things a little. During LTO same types may come with |
1637 | different BINFOs. Either because their virtual table was | |
1638 | not merged by tree merging and only later at decl merging or | |
1639 | because one type comes with external vtable, while other | |
1640 | with internal. We want to merge equivalent binfos to conserve | |
1641 | memory and streaming overhead. | |
1642 | ||
1643 | The external vtables are more harmful: they contain references | |
1644 | to external declarations of methods that may be defined in the | |
1645 | merged LTO unit. For this reason we absolutely need to remove | |
1646 | them and replace by internal variants. Not doing so will lead | |
1647 | to incomplete answers from possible_polymorphic_call_targets. | |
1648 | ||
1649 | FIXME: disable for now; because ODR types are now build during | |
1650 | streaming in, the variants do not need to be linked to the type, | |
1651 | yet. We need to do the merging in cleanup pass to be implemented | |
1652 | soon. */ | |
1653 | if (!flag_ltrans && merge | |
1654 | && 0 | |
1655 | && TREE_CODE (val->type) == RECORD_TYPE | |
1656 | && TREE_CODE (type) == RECORD_TYPE | |
1657 | && TYPE_BINFO (val->type) && TYPE_BINFO (type) | |
1658 | && TYPE_MAIN_VARIANT (type) == type | |
1659 | && TYPE_MAIN_VARIANT (val->type) == val->type | |
1660 | && BINFO_VTABLE (TYPE_BINFO (val->type)) | |
1661 | && BINFO_VTABLE (TYPE_BINFO (type))) | |
1662 | { | |
1663 | tree master_binfo = TYPE_BINFO (val->type); | |
1664 | tree v1 = BINFO_VTABLE (master_binfo); | |
1665 | tree v2 = BINFO_VTABLE (TYPE_BINFO (type)); | |
7d8adcba | 1666 | |
609570b4 JH |
1667 | if (TREE_CODE (v1) == POINTER_PLUS_EXPR) |
1668 | { | |
1669 | gcc_assert (TREE_CODE (v2) == POINTER_PLUS_EXPR | |
1670 | && operand_equal_p (TREE_OPERAND (v1, 1), | |
1671 | TREE_OPERAND (v2, 1), 0)); | |
1672 | v1 = TREE_OPERAND (TREE_OPERAND (v1, 0), 0); | |
1673 | v2 = TREE_OPERAND (TREE_OPERAND (v2, 0), 0); | |
61a74079 | 1674 | } |
609570b4 JH |
1675 | gcc_assert (DECL_ASSEMBLER_NAME (v1) |
1676 | == DECL_ASSEMBLER_NAME (v2)); | |
61a74079 | 1677 | |
609570b4 | 1678 | if (DECL_EXTERNAL (v1) && !DECL_EXTERNAL (v2)) |
61a74079 | 1679 | { |
609570b4 | 1680 | unsigned int i; |
61a74079 | 1681 | |
609570b4 JH |
1682 | set_type_binfo (val->type, TYPE_BINFO (type)); |
1683 | for (i = 0; i < val->types->length (); i++) | |
61a74079 | 1684 | { |
609570b4 JH |
1685 | if (TYPE_BINFO ((*val->types)[i]) |
1686 | == master_binfo) | |
1687 | set_type_binfo ((*val->types)[i], TYPE_BINFO (type)); | |
61a74079 | 1688 | } |
609570b4 | 1689 | BINFO_TYPE (TYPE_BINFO (type)) = val->type; |
61a74079 | 1690 | } |
609570b4 JH |
1691 | else |
1692 | set_type_binfo (type, master_binfo); | |
61a74079 | 1693 | } |
549bcbd1 | 1694 | return build_bases; |
61a74079 JH |
1695 | } |
1696 | ||
eefe9a99 JH |
1697 | /* Get ODR type hash entry for TYPE. If INSERT is true, create |
1698 | possibly new entry. */ | |
1699 | ||
1700 | odr_type | |
1701 | get_odr_type (tree type, bool insert) | |
1702 | { | |
609570b4 JH |
1703 | odr_type_d **slot = NULL; |
1704 | odr_type_d **vtable_slot = NULL; | |
1705 | odr_type val = NULL; | |
eefe9a99 | 1706 | hashval_t hash; |
549bcbd1 JH |
1707 | bool build_bases = false; |
1708 | bool insert_to_odr_array = false; | |
1709 | int base_id = -1; | |
1710 | ||
1711 | type = main_odr_variant (type); | |
eefe9a99 | 1712 | |
609570b4 JH |
1713 | gcc_checking_assert (can_be_name_hashed_p (type) |
1714 | || can_be_vtable_hashed_p (type)); | |
1715 | ||
1716 | /* Lookup entry, first try name hash, fallback to vtable hash. */ | |
1717 | if (can_be_name_hashed_p (type)) | |
1718 | { | |
1719 | hash = hash_odr_name (type); | |
1720 | slot = odr_hash->find_slot_with_hash (type, hash, | |
1721 | insert ? INSERT : NO_INSERT); | |
1722 | } | |
1723 | if ((!slot || !*slot) && in_lto_p && can_be_vtable_hashed_p (type)) | |
1724 | { | |
1725 | hash = hash_odr_vtable (type); | |
1726 | vtable_slot = odr_vtable_hash->find_slot_with_hash (type, hash, | |
1727 | insert ? INSERT : NO_INSERT); | |
1728 | } | |
1729 | ||
1730 | if (!slot && !vtable_slot) | |
eefe9a99 JH |
1731 | return NULL; |
1732 | ||
1733 | /* See if we already have entry for type. */ | |
609570b4 | 1734 | if ((slot && *slot) || (vtable_slot && *vtable_slot)) |
eefe9a99 | 1735 | { |
609570b4 JH |
1736 | if (slot && *slot) |
1737 | { | |
1738 | val = *slot; | |
1739 | #ifdef ENABLE_CHECKING | |
1740 | if (in_lto_p && can_be_vtable_hashed_p (type)) | |
1741 | { | |
1742 | hash = hash_odr_vtable (type); | |
1743 | vtable_slot = odr_vtable_hash->find_slot_with_hash (type, hash, | |
1744 | NO_INSERT); | |
1745 | gcc_assert (!vtable_slot || *vtable_slot == *slot); | |
1746 | vtable_slot = NULL; | |
1747 | } | |
1748 | #endif | |
1749 | } | |
1750 | else if (*vtable_slot) | |
1751 | val = *vtable_slot; | |
eefe9a99 | 1752 | |
609570b4 JH |
1753 | if (val->type != type |
1754 | && (!val->types_set || !val->types_set->add (type))) | |
1755 | { | |
1756 | gcc_assert (insert); | |
1757 | /* We have type duplicate, but it may introduce vtable name or | |
1758 | mangled name; be sure to keep hashes in sync. */ | |
1759 | if (in_lto_p && can_be_vtable_hashed_p (type) | |
1760 | && (!vtable_slot || !*vtable_slot)) | |
1761 | { | |
1762 | if (!vtable_slot) | |
1763 | { | |
1764 | hash = hash_odr_vtable (type); | |
1765 | vtable_slot = odr_vtable_hash->find_slot_with_hash | |
1766 | (type, hash, INSERT); | |
1767 | gcc_checking_assert (!*vtable_slot || *vtable_slot == val); | |
1768 | } | |
1769 | *vtable_slot = val; | |
1770 | } | |
1771 | if (slot && !*slot) | |
1772 | *slot = val; | |
1773 | build_bases = add_type_duplicate (val, type); | |
1774 | } | |
eefe9a99 JH |
1775 | } |
1776 | else | |
1777 | { | |
766090c2 | 1778 | val = ggc_cleared_alloc<odr_type_d> (); |
eefe9a99 JH |
1779 | val->type = type; |
1780 | val->bases = vNULL; | |
1781 | val->derived_types = vNULL; | |
0e1474e5 | 1782 | val->anonymous_namespace = type_in_anonymous_namespace_p (type); |
549bcbd1 JH |
1783 | build_bases = COMPLETE_TYPE_P (val->type); |
1784 | insert_to_odr_array = true; | |
609570b4 JH |
1785 | if (slot) |
1786 | *slot = val; | |
1787 | if (vtable_slot) | |
1788 | *vtable_slot = val; | |
549bcbd1 JH |
1789 | } |
1790 | ||
1791 | if (build_bases && TREE_CODE (type) == RECORD_TYPE && TYPE_BINFO (type) | |
1792 | && type == TYPE_MAIN_VARIANT (type)) | |
1793 | { | |
1794 | tree binfo = TYPE_BINFO (type); | |
1795 | unsigned int i; | |
1796 | ||
1797 | gcc_assert (BINFO_TYPE (TYPE_BINFO (val->type)) = type); | |
1798 | ||
2d1644bf | 1799 | val->all_derivations_known = type_all_derivations_known_p (type); |
eefe9a99 JH |
1800 | for (i = 0; i < BINFO_N_BASE_BINFOS (binfo); i++) |
1801 | /* For now record only polymorphic types. other are | |
1802 | pointless for devirtualization and we can not precisely | |
1803 | determine ODR equivalency of these during LTO. */ | |
1804 | if (polymorphic_type_binfo_p (BINFO_BASE_BINFO (binfo, i))) | |
1805 | { | |
1806 | odr_type base = get_odr_type (BINFO_TYPE (BINFO_BASE_BINFO (binfo, | |
1807 | i)), | |
1808 | true); | |
549bcbd1 | 1809 | gcc_assert (TYPE_MAIN_VARIANT (base->type) == base->type); |
eefe9a99 JH |
1810 | base->derived_types.safe_push (val); |
1811 | val->bases.safe_push (base); | |
549bcbd1 JH |
1812 | if (base->id > base_id) |
1813 | base_id = base->id; | |
eefe9a99 | 1814 | } |
549bcbd1 JH |
1815 | } |
1816 | /* Ensure that type always appears after bases. */ | |
1817 | if (insert_to_odr_array) | |
1818 | { | |
eefe9a99 | 1819 | if (odr_types_ptr) |
c3284718 | 1820 | val->id = odr_types.length (); |
eefe9a99 JH |
1821 | vec_safe_push (odr_types_ptr, val); |
1822 | } | |
549bcbd1 JH |
1823 | else if (base_id > val->id) |
1824 | { | |
1825 | odr_types[val->id] = 0; | |
1826 | /* Be sure we did not recorded any derived types; these may need | |
1827 | renumbering too. */ | |
1828 | gcc_assert (val->derived_types.length() == 0); | |
1829 | if (odr_types_ptr) | |
1830 | val->id = odr_types.length (); | |
1831 | vec_safe_push (odr_types_ptr, val); | |
1832 | } | |
eefe9a99 JH |
1833 | return val; |
1834 | } | |
1835 | ||
1ee85ee1 JH |
1836 | /* Add TYPE od ODR type hash. */ |
1837 | ||
1838 | void | |
1839 | register_odr_type (tree type) | |
1840 | { | |
1841 | if (!odr_hash) | |
609570b4 JH |
1842 | { |
1843 | odr_hash = new odr_hash_type (23); | |
1844 | if (in_lto_p) | |
1845 | odr_vtable_hash = new odr_vtable_hash_type (23); | |
1846 | } | |
1ee85ee1 JH |
1847 | /* Arrange things to be nicer and insert main variants first. */ |
1848 | if (odr_type_p (TYPE_MAIN_VARIANT (type))) | |
1849 | get_odr_type (TYPE_MAIN_VARIANT (type), true); | |
1850 | if (TYPE_MAIN_VARIANT (type) != type) | |
1851 | get_odr_type (type, true); | |
1852 | } | |
1853 | ||
aa803cc7 JH |
1854 | /* Return true if type is known to have no derivations. */ |
1855 | ||
1856 | bool | |
1857 | type_known_to_have_no_deriavations_p (tree t) | |
1858 | { | |
1859 | return (type_all_derivations_known_p (t) | |
1860 | && (TYPE_FINAL_P (t) | |
1861 | || (odr_hash | |
1862 | && !get_odr_type (t, true)->derived_types.length()))); | |
1863 | } | |
1864 | ||
d6ae9a6d SL |
1865 | /* Dump ODR type T and all its derived types. INDENT specifies indentation for |
1866 | recursive printing. */ | |
eefe9a99 JH |
1867 | |
1868 | static void | |
1869 | dump_odr_type (FILE *f, odr_type t, int indent=0) | |
1870 | { | |
1871 | unsigned int i; | |
1872 | fprintf (f, "%*s type %i: ", indent * 2, "", t->id); | |
1873 | print_generic_expr (f, t->type, TDF_SLIM); | |
2d1644bf JH |
1874 | fprintf (f, "%s", t->anonymous_namespace ? " (anonymous namespace)":""); |
1875 | fprintf (f, "%s\n", t->all_derivations_known ? " (derivations known)":""); | |
eefe9a99 JH |
1876 | if (TYPE_NAME (t->type)) |
1877 | { | |
730c436a | 1878 | /*fprintf (f, "%*s defined at: %s:%i\n", indent * 2, "", |
eefe9a99 | 1879 | DECL_SOURCE_FILE (TYPE_NAME (t->type)), |
730c436a | 1880 | DECL_SOURCE_LINE (TYPE_NAME (t->type)));*/ |
88b16508 JH |
1881 | if (DECL_ASSEMBLER_NAME_SET_P (TYPE_NAME (t->type))) |
1882 | fprintf (f, "%*s mangled name: %s\n", indent * 2, "", | |
1883 | IDENTIFIER_POINTER | |
1884 | (DECL_ASSEMBLER_NAME (TYPE_NAME (t->type)))); | |
eefe9a99 | 1885 | } |
c3284718 | 1886 | if (t->bases.length ()) |
eefe9a99 JH |
1887 | { |
1888 | fprintf (f, "%*s base odr type ids: ", indent * 2, ""); | |
c3284718 | 1889 | for (i = 0; i < t->bases.length (); i++) |
eefe9a99 JH |
1890 | fprintf (f, " %i", t->bases[i]->id); |
1891 | fprintf (f, "\n"); | |
1892 | } | |
c3284718 | 1893 | if (t->derived_types.length ()) |
eefe9a99 JH |
1894 | { |
1895 | fprintf (f, "%*s derived types:\n", indent * 2, ""); | |
c3284718 | 1896 | for (i = 0; i < t->derived_types.length (); i++) |
eefe9a99 JH |
1897 | dump_odr_type (f, t->derived_types[i], indent + 1); |
1898 | } | |
1899 | fprintf (f, "\n"); | |
1900 | } | |
1901 | ||
1902 | /* Dump the type inheritance graph. */ | |
1903 | ||
1904 | static void | |
1905 | dump_type_inheritance_graph (FILE *f) | |
1906 | { | |
1907 | unsigned int i; | |
0e1474e5 JH |
1908 | if (!odr_types_ptr) |
1909 | return; | |
eefe9a99 | 1910 | fprintf (f, "\n\nType inheritance graph:\n"); |
c3284718 | 1911 | for (i = 0; i < odr_types.length (); i++) |
eefe9a99 | 1912 | { |
549bcbd1 | 1913 | if (odr_types[i] && odr_types[i]->bases.length () == 0) |
eefe9a99 JH |
1914 | dump_odr_type (f, odr_types[i]); |
1915 | } | |
c3284718 | 1916 | for (i = 0; i < odr_types.length (); i++) |
61a74079 | 1917 | { |
549bcbd1 | 1918 | if (odr_types[i] && odr_types[i]->types && odr_types[i]->types->length ()) |
61a74079 JH |
1919 | { |
1920 | unsigned int j; | |
1921 | fprintf (f, "Duplicate tree types for odr type %i\n", i); | |
1922 | print_node (f, "", odr_types[i]->type, 0); | |
c3284718 | 1923 | for (j = 0; j < odr_types[i]->types->length (); j++) |
61a74079 JH |
1924 | { |
1925 | tree t; | |
1926 | fprintf (f, "duplicate #%i\n", j); | |
1927 | print_node (f, "", (*odr_types[i]->types)[j], 0); | |
1928 | t = (*odr_types[i]->types)[j]; | |
1929 | while (TYPE_P (t) && TYPE_CONTEXT (t)) | |
1930 | { | |
1931 | t = TYPE_CONTEXT (t); | |
1932 | print_node (f, "", t, 0); | |
1933 | } | |
1934 | putc ('\n',f); | |
1935 | } | |
1936 | } | |
1937 | } | |
eefe9a99 JH |
1938 | } |
1939 | ||
1940 | /* Given method type T, return type of class it belongs to. | |
d6ae9a6d | 1941 | Look up this pointer and get its type. */ |
eefe9a99 | 1942 | |
64cbf23d | 1943 | tree |
d570d364 | 1944 | method_class_type (const_tree t) |
eefe9a99 JH |
1945 | { |
1946 | tree first_parm_type = TREE_VALUE (TYPE_ARG_TYPES (t)); | |
68377e53 | 1947 | gcc_assert (TREE_CODE (t) == METHOD_TYPE); |
eefe9a99 JH |
1948 | |
1949 | return TREE_TYPE (first_parm_type); | |
1950 | } | |
1951 | ||
1952 | /* Initialize IPA devirt and build inheritance tree graph. */ | |
1953 | ||
1954 | void | |
1955 | build_type_inheritance_graph (void) | |
1956 | { | |
b270b096 | 1957 | struct symtab_node *n; |
eefe9a99 JH |
1958 | FILE *inheritance_dump_file; |
1959 | int flags; | |
1960 | ||
c203e8a7 | 1961 | if (odr_hash) |
eefe9a99 JH |
1962 | return; |
1963 | timevar_push (TV_IPA_INHERITANCE); | |
1964 | inheritance_dump_file = dump_begin (TDI_inheritance, &flags); | |
c203e8a7 | 1965 | odr_hash = new odr_hash_type (23); |
609570b4 JH |
1966 | if (in_lto_p) |
1967 | odr_vtable_hash = new odr_vtable_hash_type (23); | |
eefe9a99 JH |
1968 | |
1969 | /* We reconstruct the graph starting of types of all methods seen in the | |
1970 | the unit. */ | |
b270b096 | 1971 | FOR_EACH_SYMBOL (n) |
7de90a6c | 1972 | if (is_a <cgraph_node *> (n) |
b270b096 | 1973 | && DECL_VIRTUAL_P (n->decl) |
d52f5295 | 1974 | && n->real_symbol_p ()) |
549bcbd1 JH |
1975 | get_odr_type (TYPE_MAIN_VARIANT (method_class_type (TREE_TYPE (n->decl))), |
1976 | true); | |
b270b096 JH |
1977 | |
1978 | /* Look also for virtual tables of types that do not define any methods. | |
1979 | ||
1980 | We need it in a case where class B has virtual base of class A | |
1981 | re-defining its virtual method and there is class C with no virtual | |
1982 | methods with B as virtual base. | |
1983 | ||
1984 | Here we output B's virtual method in two variant - for non-virtual | |
1985 | and virtual inheritance. B's virtual table has non-virtual version, | |
1986 | while C's has virtual. | |
1987 | ||
1988 | For this reason we need to know about C in order to include both | |
1989 | variants of B. More correctly, record_target_from_binfo should | |
1990 | add both variants of the method when walking B, but we have no | |
1991 | link in between them. | |
1992 | ||
1993 | We rely on fact that either the method is exported and thus we | |
1994 | assume it is called externally or C is in anonymous namespace and | |
1995 | thus we will see the vtable. */ | |
1996 | ||
7de90a6c | 1997 | else if (is_a <varpool_node *> (n) |
b270b096 JH |
1998 | && DECL_VIRTUAL_P (n->decl) |
1999 | && TREE_CODE (DECL_CONTEXT (n->decl)) == RECORD_TYPE | |
2000 | && TYPE_BINFO (DECL_CONTEXT (n->decl)) | |
2001 | && polymorphic_type_binfo_p (TYPE_BINFO (DECL_CONTEXT (n->decl)))) | |
549bcbd1 | 2002 | get_odr_type (TYPE_MAIN_VARIANT (DECL_CONTEXT (n->decl)), true); |
eefe9a99 JH |
2003 | if (inheritance_dump_file) |
2004 | { | |
2005 | dump_type_inheritance_graph (inheritance_dump_file); | |
2006 | dump_end (TDI_inheritance, inheritance_dump_file); | |
2007 | } | |
2008 | timevar_pop (TV_IPA_INHERITANCE); | |
2009 | } | |
2010 | ||
ccb05ef2 JH |
2011 | /* Return true if N has reference from live virtual table |
2012 | (and thus can be a destination of polymorphic call). | |
2013 | Be conservatively correct when callgraph is not built or | |
2014 | if the method may be referred externally. */ | |
2015 | ||
2016 | static bool | |
2017 | referenced_from_vtable_p (struct cgraph_node *node) | |
2018 | { | |
2019 | int i; | |
2020 | struct ipa_ref *ref; | |
2021 | bool found = false; | |
2022 | ||
2023 | if (node->externally_visible | |
7d0aa05b | 2024 | || DECL_EXTERNAL (node->decl) |
ccb05ef2 JH |
2025 | || node->used_from_other_partition) |
2026 | return true; | |
2027 | ||
2028 | /* Keep this test constant time. | |
2029 | It is unlikely this can happen except for the case where speculative | |
2030 | devirtualization introduced many speculative edges to this node. | |
2031 | In this case the target is very likely alive anyway. */ | |
2032 | if (node->ref_list.referring.length () > 100) | |
2033 | return true; | |
2034 | ||
2035 | /* We need references built. */ | |
3dafb85c | 2036 | if (symtab->state <= CONSTRUCTION) |
ccb05ef2 JH |
2037 | return true; |
2038 | ||
d122681a | 2039 | for (i = 0; node->iterate_referring (i, ref); i++) |
ccb05ef2 | 2040 | if ((ref->use == IPA_REF_ALIAS |
d52f5295 | 2041 | && referenced_from_vtable_p (dyn_cast<cgraph_node *> (ref->referring))) |
ccb05ef2 JH |
2042 | || (ref->use == IPA_REF_ADDR |
2043 | && TREE_CODE (ref->referring->decl) == VAR_DECL | |
2044 | && DECL_VIRTUAL_P (ref->referring->decl))) | |
2045 | { | |
2046 | found = true; | |
2047 | break; | |
2048 | } | |
2049 | return found; | |
2050 | } | |
2051 | ||
68377e53 | 2052 | /* If TARGET has associated node, record it in the NODES array. |
ec77d61f JH |
2053 | CAN_REFER specify if program can refer to the target directly. |
2054 | if TARGET is unknown (NULL) or it can not be inserted (for example because | |
2055 | its body was already removed and there is no way to refer to it), clear | |
2056 | COMPLETEP. */ | |
eefe9a99 JH |
2057 | |
2058 | static void | |
2059 | maybe_record_node (vec <cgraph_node *> &nodes, | |
6e2830c3 | 2060 | tree target, hash_set<tree> *inserted, |
ec77d61f | 2061 | bool can_refer, |
68377e53 | 2062 | bool *completep) |
eefe9a99 | 2063 | { |
958c1d61 JH |
2064 | struct cgraph_node *target_node, *alias_target; |
2065 | enum availability avail; | |
88f592e3 JH |
2066 | |
2067 | /* cxa_pure_virtual and __builtin_unreachable do not need to be added into | |
2068 | list of targets; the runtime effect of calling them is undefined. | |
2069 | Only "real" virtual methods should be accounted. */ | |
2070 | if (target && TREE_CODE (TREE_TYPE (target)) != METHOD_TYPE) | |
2071 | return; | |
eefe9a99 | 2072 | |
ec77d61f JH |
2073 | if (!can_refer) |
2074 | { | |
2075 | /* The only case when method of anonymous namespace becomes unreferable | |
2076 | is when we completely optimized it out. */ | |
2077 | if (flag_ltrans | |
2078 | || !target | |
88f592e3 | 2079 | || !type_in_anonymous_namespace_p (DECL_CONTEXT (target))) |
ec77d61f JH |
2080 | *completep = false; |
2081 | return; | |
2082 | } | |
2083 | ||
88f592e3 | 2084 | if (!target) |
68377e53 JH |
2085 | return; |
2086 | ||
d52f5295 | 2087 | target_node = cgraph_node::get (target); |
68377e53 | 2088 | |
d6ae9a6d | 2089 | /* Prefer alias target over aliases, so we do not get confused by |
958c1d61 JH |
2090 | fake duplicates. */ |
2091 | if (target_node) | |
2092 | { | |
d52f5295 | 2093 | alias_target = target_node->ultimate_alias_target (&avail); |
958c1d61 JH |
2094 | if (target_node != alias_target |
2095 | && avail >= AVAIL_AVAILABLE | |
d52f5295 | 2096 | && target_node->get_availability ()) |
958c1d61 JH |
2097 | target_node = alias_target; |
2098 | } | |
2099 | ||
ccb05ef2 | 2100 | /* Method can only be called by polymorphic call if any |
d6ae9a6d | 2101 | of vtables referring to it are alive. |
ccb05ef2 JH |
2102 | |
2103 | While this holds for non-anonymous functions, too, there are | |
2104 | cases where we want to keep them in the list; for example | |
2105 | inline functions with -fno-weak are static, but we still | |
2106 | may devirtualize them when instance comes from other unit. | |
2107 | The same holds for LTO. | |
2108 | ||
2109 | Currently we ignore these functions in speculative devirtualization. | |
2110 | ??? Maybe it would make sense to be more aggressive for LTO even | |
d6ae9a6d | 2111 | elsewhere. */ |
ccb05ef2 JH |
2112 | if (!flag_ltrans |
2113 | && type_in_anonymous_namespace_p (DECL_CONTEXT (target)) | |
2114 | && (!target_node | |
2115 | || !referenced_from_vtable_p (target_node))) | |
2116 | ; | |
2117 | /* See if TARGET is useful function we can deal with. */ | |
2118 | else if (target_node != NULL | |
2119 | && (TREE_PUBLIC (target) | |
2120 | || DECL_EXTERNAL (target) | |
2121 | || target_node->definition) | |
d52f5295 | 2122 | && target_node->real_symbol_p ()) |
0e1474e5 | 2123 | { |
68377e53 | 2124 | gcc_assert (!target_node->global.inlined_to); |
d52f5295 | 2125 | gcc_assert (target_node->real_symbol_p ()); |
6e2830c3 | 2126 | if (!inserted->add (target)) |
68377e53 | 2127 | { |
6e2830c3 | 2128 | cached_polymorphic_call_targets->add (target_node); |
68377e53 JH |
2129 | nodes.safe_push (target_node); |
2130 | } | |
0e1474e5 | 2131 | } |
68377e53 | 2132 | else if (completep |
2d1644bf JH |
2133 | && (!type_in_anonymous_namespace_p |
2134 | (DECL_CONTEXT (target)) | |
2135 | || flag_ltrans)) | |
0439a947 | 2136 | *completep = false; |
eefe9a99 JH |
2137 | } |
2138 | ||
d6ae9a6d | 2139 | /* See if BINFO's type matches OUTER_TYPE. If so, look up |
68377e53 | 2140 | BINFO of subtype of OTR_TYPE at OFFSET and in that BINFO find |
2d1644bf JH |
2141 | method in vtable and insert method to NODES array |
2142 | or BASES_TO_CONSIDER if this array is non-NULL. | |
eefe9a99 | 2143 | Otherwise recurse to base BINFOs. |
d6ae9a6d | 2144 | This matches what get_binfo_at_offset does, but with offset |
eefe9a99 JH |
2145 | being unknown. |
2146 | ||
a3788dde JH |
2147 | TYPE_BINFOS is a stack of BINFOS of types with defined |
2148 | virtual table seen on way from class type to BINFO. | |
eefe9a99 JH |
2149 | |
2150 | MATCHED_VTABLES tracks virtual tables we already did lookup | |
68377e53 JH |
2151 | for virtual function in. INSERTED tracks nodes we already |
2152 | inserted. | |
3462aa02 JH |
2153 | |
2154 | ANONYMOUS is true if BINFO is part of anonymous namespace. | |
ec77d61f JH |
2155 | |
2156 | Clear COMPLETEP when we hit unreferable target. | |
eefe9a99 JH |
2157 | */ |
2158 | ||
2159 | static void | |
68377e53 | 2160 | record_target_from_binfo (vec <cgraph_node *> &nodes, |
2d1644bf | 2161 | vec <tree> *bases_to_consider, |
68377e53 JH |
2162 | tree binfo, |
2163 | tree otr_type, | |
a3788dde | 2164 | vec <tree> &type_binfos, |
68377e53 JH |
2165 | HOST_WIDE_INT otr_token, |
2166 | tree outer_type, | |
2167 | HOST_WIDE_INT offset, | |
6e2830c3 TS |
2168 | hash_set<tree> *inserted, |
2169 | hash_set<tree> *matched_vtables, | |
ec77d61f JH |
2170 | bool anonymous, |
2171 | bool *completep) | |
eefe9a99 JH |
2172 | { |
2173 | tree type = BINFO_TYPE (binfo); | |
2174 | int i; | |
2175 | tree base_binfo; | |
2176 | ||
eefe9a99 | 2177 | |
a3788dde JH |
2178 | if (BINFO_VTABLE (binfo)) |
2179 | type_binfos.safe_push (binfo); | |
68377e53 | 2180 | if (types_same_for_odr (type, outer_type)) |
eefe9a99 | 2181 | { |
a3788dde JH |
2182 | int i; |
2183 | tree type_binfo = NULL; | |
2184 | ||
d6ae9a6d | 2185 | /* Look up BINFO with virtual table. For normal types it is always last |
a3788dde JH |
2186 | binfo on stack. */ |
2187 | for (i = type_binfos.length () - 1; i >= 0; i--) | |
2188 | if (BINFO_OFFSET (type_binfos[i]) == BINFO_OFFSET (binfo)) | |
2189 | { | |
2190 | type_binfo = type_binfos[i]; | |
2191 | break; | |
2192 | } | |
2193 | if (BINFO_VTABLE (binfo)) | |
2194 | type_binfos.pop (); | |
2195 | /* If this is duplicated BINFO for base shared by virtual inheritance, | |
2196 | we may not have its associated vtable. This is not a problem, since | |
2197 | we will walk it on the other path. */ | |
2198 | if (!type_binfo) | |
6d6af792 | 2199 | return; |
68377e53 JH |
2200 | tree inner_binfo = get_binfo_at_offset (type_binfo, |
2201 | offset, otr_type); | |
ec77d61f JH |
2202 | if (!inner_binfo) |
2203 | { | |
2204 | gcc_assert (odr_violation_reported); | |
2205 | return; | |
2206 | } | |
3462aa02 JH |
2207 | /* For types in anonymous namespace first check if the respective vtable |
2208 | is alive. If not, we know the type can't be called. */ | |
2209 | if (!flag_ltrans && anonymous) | |
2210 | { | |
68377e53 | 2211 | tree vtable = BINFO_VTABLE (inner_binfo); |
2c8326a5 | 2212 | varpool_node *vnode; |
3462aa02 JH |
2213 | |
2214 | if (TREE_CODE (vtable) == POINTER_PLUS_EXPR) | |
2215 | vtable = TREE_OPERAND (TREE_OPERAND (vtable, 0), 0); | |
9041d2e6 | 2216 | vnode = varpool_node::get (vtable); |
67348ccc | 2217 | if (!vnode || !vnode->definition) |
3462aa02 JH |
2218 | return; |
2219 | } | |
68377e53 | 2220 | gcc_assert (inner_binfo); |
2d1644bf | 2221 | if (bases_to_consider |
6e2830c3 TS |
2222 | ? !matched_vtables->contains (BINFO_VTABLE (inner_binfo)) |
2223 | : !matched_vtables->add (BINFO_VTABLE (inner_binfo))) | |
68377e53 | 2224 | { |
ec77d61f JH |
2225 | bool can_refer; |
2226 | tree target = gimple_get_virt_method_for_binfo (otr_token, | |
2227 | inner_binfo, | |
2228 | &can_refer); | |
2d1644bf JH |
2229 | if (!bases_to_consider) |
2230 | maybe_record_node (nodes, target, inserted, can_refer, completep); | |
2231 | /* Destructors are never called via construction vtables. */ | |
2232 | else if (!target || !DECL_CXX_DESTRUCTOR_P (target)) | |
2233 | bases_to_consider->safe_push (target); | |
68377e53 | 2234 | } |
eefe9a99 JH |
2235 | return; |
2236 | } | |
2237 | ||
2238 | /* Walk bases. */ | |
2239 | for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++) | |
d6ae9a6d | 2240 | /* Walking bases that have no virtual method is pointless exercise. */ |
eefe9a99 | 2241 | if (polymorphic_type_binfo_p (base_binfo)) |
2d1644bf | 2242 | record_target_from_binfo (nodes, bases_to_consider, base_binfo, otr_type, |
a3788dde | 2243 | type_binfos, |
68377e53 | 2244 | otr_token, outer_type, offset, inserted, |
ec77d61f | 2245 | matched_vtables, anonymous, completep); |
a3788dde JH |
2246 | if (BINFO_VTABLE (binfo)) |
2247 | type_binfos.pop (); | |
eefe9a99 JH |
2248 | } |
2249 | ||
d6ae9a6d | 2250 | /* Look up virtual methods matching OTR_TYPE (with OFFSET and OTR_TOKEN) |
eefe9a99 JH |
2251 | of TYPE, insert them to NODES, recurse into derived nodes. |
2252 | INSERTED is used to avoid duplicate insertions of methods into NODES. | |
ec77d61f | 2253 | MATCHED_VTABLES are used to avoid duplicate walking vtables. |
2d1644bf JH |
2254 | Clear COMPLETEP if unreferable target is found. |
2255 | ||
d6ae9a6d | 2256 | If CONSIDER_CONSTRUCTION is true, record to BASES_TO_CONSIDER |
2d1644bf JH |
2257 | all cases where BASE_SKIPPED is true (because the base is abstract |
2258 | class). */ | |
eefe9a99 JH |
2259 | |
2260 | static void | |
2261 | possible_polymorphic_call_targets_1 (vec <cgraph_node *> &nodes, | |
6e2830c3 TS |
2262 | hash_set<tree> *inserted, |
2263 | hash_set<tree> *matched_vtables, | |
eefe9a99 JH |
2264 | tree otr_type, |
2265 | odr_type type, | |
68377e53 JH |
2266 | HOST_WIDE_INT otr_token, |
2267 | tree outer_type, | |
ec77d61f | 2268 | HOST_WIDE_INT offset, |
2d1644bf JH |
2269 | bool *completep, |
2270 | vec <tree> &bases_to_consider, | |
2271 | bool consider_construction) | |
eefe9a99 JH |
2272 | { |
2273 | tree binfo = TYPE_BINFO (type->type); | |
2274 | unsigned int i; | |
1be0e58d | 2275 | auto_vec <tree, 8> type_binfos; |
2d1644bf JH |
2276 | bool possibly_instantiated = type_possibly_instantiated_p (type->type); |
2277 | ||
2278 | /* We may need to consider types w/o instances because of possible derived | |
2279 | types using their methods either directly or via construction vtables. | |
2280 | We are safe to skip them when all derivations are known, since we will | |
2281 | handle them later. | |
2282 | This is done by recording them to BASES_TO_CONSIDER array. */ | |
2283 | if (possibly_instantiated || consider_construction) | |
2284 | { | |
2285 | record_target_from_binfo (nodes, | |
2286 | (!possibly_instantiated | |
2287 | && type_all_derivations_known_p (type->type)) | |
2288 | ? &bases_to_consider : NULL, | |
2289 | binfo, otr_type, type_binfos, otr_token, | |
2290 | outer_type, offset, | |
2291 | inserted, matched_vtables, | |
2292 | type->anonymous_namespace, completep); | |
2293 | } | |
c3284718 | 2294 | for (i = 0; i < type->derived_types.length (); i++) |
eefe9a99 JH |
2295 | possible_polymorphic_call_targets_1 (nodes, inserted, |
2296 | matched_vtables, | |
2297 | otr_type, | |
2298 | type->derived_types[i], | |
2d1644bf JH |
2299 | otr_token, outer_type, offset, completep, |
2300 | bases_to_consider, consider_construction); | |
eefe9a99 JH |
2301 | } |
2302 | ||
2303 | /* Cache of queries for polymorphic call targets. | |
2304 | ||
2305 | Enumerating all call targets may get expensive when there are many | |
2306 | polymorphic calls in the program, so we memoize all the previous | |
2307 | queries and avoid duplicated work. */ | |
2308 | ||
2309 | struct polymorphic_call_target_d | |
2310 | { | |
eefe9a99 | 2311 | HOST_WIDE_INT otr_token; |
68377e53 JH |
2312 | ipa_polymorphic_call_context context; |
2313 | odr_type type; | |
eefe9a99 | 2314 | vec <cgraph_node *> targets; |
91bc34a9 | 2315 | tree decl_warning; |
2f28755f JH |
2316 | int type_warning; |
2317 | bool complete; | |
2318 | bool speculative; | |
eefe9a99 JH |
2319 | }; |
2320 | ||
2321 | /* Polymorphic call target cache helpers. */ | |
2322 | ||
2323 | struct polymorphic_call_target_hasher | |
2324 | { | |
2325 | typedef polymorphic_call_target_d value_type; | |
2326 | typedef polymorphic_call_target_d compare_type; | |
2327 | static inline hashval_t hash (const value_type *); | |
2328 | static inline bool equal (const value_type *, const compare_type *); | |
2329 | static inline void remove (value_type *); | |
2330 | }; | |
2331 | ||
2332 | /* Return the computed hashcode for ODR_QUERY. */ | |
2333 | ||
2334 | inline hashval_t | |
2335 | polymorphic_call_target_hasher::hash (const value_type *odr_query) | |
2336 | { | |
d313d45f AK |
2337 | inchash::hash hstate (odr_query->otr_token); |
2338 | ||
2339 | hstate.add_wide_int (odr_query->type->id); | |
2340 | hstate.merge_hash (TYPE_UID (odr_query->context.outer_type)); | |
2341 | hstate.add_wide_int (odr_query->context.offset); | |
68377e53 | 2342 | |
3339f0bc JH |
2343 | if (odr_query->context.speculative_outer_type) |
2344 | { | |
d313d45f AK |
2345 | hstate.merge_hash (TYPE_UID (odr_query->context.speculative_outer_type)); |
2346 | hstate.add_wide_int (odr_query->context.speculative_offset); | |
3339f0bc | 2347 | } |
2f28755f | 2348 | hstate.add_flag (odr_query->speculative); |
d313d45f AK |
2349 | hstate.add_flag (odr_query->context.maybe_in_construction); |
2350 | hstate.add_flag (odr_query->context.maybe_derived_type); | |
2351 | hstate.add_flag (odr_query->context.speculative_maybe_derived_type); | |
2352 | hstate.commit_flag (); | |
2353 | return hstate.end (); | |
eefe9a99 JH |
2354 | } |
2355 | ||
2356 | /* Compare cache entries T1 and T2. */ | |
2357 | ||
2358 | inline bool | |
2359 | polymorphic_call_target_hasher::equal (const value_type *t1, | |
2360 | const compare_type *t2) | |
2361 | { | |
68377e53 | 2362 | return (t1->type == t2->type && t1->otr_token == t2->otr_token |
2f28755f | 2363 | && t1->speculative == t2->speculative |
68377e53 | 2364 | && t1->context.offset == t2->context.offset |
3339f0bc | 2365 | && t1->context.speculative_offset == t2->context.speculative_offset |
68377e53 | 2366 | && t1->context.outer_type == t2->context.outer_type |
3339f0bc | 2367 | && t1->context.speculative_outer_type == t2->context.speculative_outer_type |
68377e53 JH |
2368 | && t1->context.maybe_in_construction |
2369 | == t2->context.maybe_in_construction | |
3339f0bc JH |
2370 | && t1->context.maybe_derived_type == t2->context.maybe_derived_type |
2371 | && (t1->context.speculative_maybe_derived_type | |
2372 | == t2->context.speculative_maybe_derived_type)); | |
eefe9a99 JH |
2373 | } |
2374 | ||
2375 | /* Remove entry in polymorphic call target cache hash. */ | |
2376 | ||
2377 | inline void | |
2378 | polymorphic_call_target_hasher::remove (value_type *v) | |
2379 | { | |
2380 | v->targets.release (); | |
2381 | free (v); | |
2382 | } | |
2383 | ||
2384 | /* Polymorphic call target query cache. */ | |
2385 | ||
c203e8a7 | 2386 | typedef hash_table<polymorphic_call_target_hasher> |
eefe9a99 | 2387 | polymorphic_call_target_hash_type; |
c203e8a7 | 2388 | static polymorphic_call_target_hash_type *polymorphic_call_target_hash; |
eefe9a99 JH |
2389 | |
2390 | /* Destroy polymorphic call target query cache. */ | |
2391 | ||
2392 | static void | |
2393 | free_polymorphic_call_targets_hash () | |
2394 | { | |
0e1474e5 JH |
2395 | if (cached_polymorphic_call_targets) |
2396 | { | |
c203e8a7 TS |
2397 | delete polymorphic_call_target_hash; |
2398 | polymorphic_call_target_hash = NULL; | |
6e2830c3 | 2399 | delete cached_polymorphic_call_targets; |
0e1474e5 JH |
2400 | cached_polymorphic_call_targets = NULL; |
2401 | } | |
eefe9a99 JH |
2402 | } |
2403 | ||
2404 | /* When virtual function is removed, we may need to flush the cache. */ | |
2405 | ||
2406 | static void | |
2407 | devirt_node_removal_hook (struct cgraph_node *n, void *d ATTRIBUTE_UNUSED) | |
2408 | { | |
0e1474e5 | 2409 | if (cached_polymorphic_call_targets |
6e2830c3 | 2410 | && cached_polymorphic_call_targets->contains (n)) |
eefe9a99 JH |
2411 | free_polymorphic_call_targets_hash (); |
2412 | } | |
2413 | ||
d6ae9a6d | 2414 | /* Look up base of BINFO that has virtual table VTABLE with OFFSET. */ |
390675c8 | 2415 | |
aa803cc7 | 2416 | tree |
85942f45 JH |
2417 | subbinfo_with_vtable_at_offset (tree binfo, unsigned HOST_WIDE_INT offset, |
2418 | tree vtable) | |
390675c8 JH |
2419 | { |
2420 | tree v = BINFO_VTABLE (binfo); | |
2421 | int i; | |
2422 | tree base_binfo; | |
85942f45 | 2423 | unsigned HOST_WIDE_INT this_offset; |
390675c8 | 2424 | |
85942f45 JH |
2425 | if (v) |
2426 | { | |
2427 | if (!vtable_pointer_value_to_vtable (v, &v, &this_offset)) | |
2428 | gcc_unreachable (); | |
2429 | ||
2430 | if (offset == this_offset | |
2431 | && DECL_ASSEMBLER_NAME (v) == DECL_ASSEMBLER_NAME (vtable)) | |
2432 | return binfo; | |
2433 | } | |
390675c8 | 2434 | |
390675c8 JH |
2435 | for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++) |
2436 | if (polymorphic_type_binfo_p (base_binfo)) | |
2437 | { | |
2438 | base_binfo = subbinfo_with_vtable_at_offset (base_binfo, offset, vtable); | |
2439 | if (base_binfo) | |
2440 | return base_binfo; | |
2441 | } | |
2442 | return NULL; | |
2443 | } | |
2444 | ||
85942f45 JH |
2445 | /* T is known constant value of virtual table pointer. |
2446 | Store virtual table to V and its offset to OFFSET. | |
2447 | Return false if T does not look like virtual table reference. */ | |
390675c8 | 2448 | |
85942f45 | 2449 | bool |
d570d364 JH |
2450 | vtable_pointer_value_to_vtable (const_tree t, tree *v, |
2451 | unsigned HOST_WIDE_INT *offset) | |
390675c8 JH |
2452 | { |
2453 | /* We expect &MEM[(void *)&virtual_table + 16B]. | |
2454 | We obtain object's BINFO from the context of the virtual table. | |
2455 | This one contains pointer to virtual table represented via | |
d6ae9a6d | 2456 | POINTER_PLUS_EXPR. Verify that this pointer matches what |
390675c8 JH |
2457 | we propagated through. |
2458 | ||
2459 | In the case of virtual inheritance, the virtual tables may | |
2460 | be nested, i.e. the offset may be different from 16 and we may | |
2461 | need to dive into the type representation. */ | |
85942f45 | 2462 | if (TREE_CODE (t) == ADDR_EXPR |
390675c8 JH |
2463 | && TREE_CODE (TREE_OPERAND (t, 0)) == MEM_REF |
2464 | && TREE_CODE (TREE_OPERAND (TREE_OPERAND (t, 0), 0)) == ADDR_EXPR | |
2465 | && TREE_CODE (TREE_OPERAND (TREE_OPERAND (t, 0), 1)) == INTEGER_CST | |
2466 | && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (t, 0), 0), 0)) | |
2467 | == VAR_DECL) | |
2468 | && DECL_VIRTUAL_P (TREE_OPERAND (TREE_OPERAND | |
2469 | (TREE_OPERAND (t, 0), 0), 0))) | |
2470 | { | |
85942f45 JH |
2471 | *v = TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (t, 0), 0), 0); |
2472 | *offset = tree_to_uhwi (TREE_OPERAND (TREE_OPERAND (t, 0), 1)); | |
2473 | return true; | |
390675c8 | 2474 | } |
85942f45 JH |
2475 | |
2476 | /* Alternative representation, used by C++ frontend is POINTER_PLUS_EXPR. | |
2477 | We need to handle it when T comes from static variable initializer or | |
2478 | BINFO. */ | |
2479 | if (TREE_CODE (t) == POINTER_PLUS_EXPR) | |
2480 | { | |
2481 | *offset = tree_to_uhwi (TREE_OPERAND (t, 1)); | |
2482 | t = TREE_OPERAND (t, 0); | |
2483 | } | |
2484 | else | |
2485 | *offset = 0; | |
2486 | ||
2487 | if (TREE_CODE (t) != ADDR_EXPR) | |
2488 | return false; | |
2489 | *v = TREE_OPERAND (t, 0); | |
2490 | return true; | |
2491 | } | |
2492 | ||
2493 | /* T is known constant value of virtual table pointer. Return BINFO of the | |
2494 | instance type. */ | |
2495 | ||
2496 | tree | |
d570d364 | 2497 | vtable_pointer_value_to_binfo (const_tree t) |
85942f45 JH |
2498 | { |
2499 | tree vtable; | |
2500 | unsigned HOST_WIDE_INT offset; | |
2501 | ||
2502 | if (!vtable_pointer_value_to_vtable (t, &vtable, &offset)) | |
2503 | return NULL_TREE; | |
2504 | ||
2505 | /* FIXME: for stores of construction vtables we return NULL, | |
2506 | because we do not have BINFO for those. Eventually we should fix | |
2507 | our representation to allow this case to be handled, too. | |
2508 | In the case we see store of BINFO we however may assume | |
d6ae9a6d | 2509 | that standard folding will be able to cope with it. */ |
85942f45 JH |
2510 | return subbinfo_with_vtable_at_offset (TYPE_BINFO (DECL_CONTEXT (vtable)), |
2511 | offset, vtable); | |
390675c8 JH |
2512 | } |
2513 | ||
68377e53 | 2514 | /* Walk bases of OUTER_TYPE that contain OTR_TYPE at OFFSET. |
d6ae9a6d SL |
2515 | Look up their respective virtual methods for OTR_TOKEN and OTR_TYPE |
2516 | and insert them in NODES. | |
68377e53 JH |
2517 | |
2518 | MATCHED_VTABLES and INSERTED is used to avoid duplicated work. */ | |
2519 | ||
2520 | static void | |
2521 | record_targets_from_bases (tree otr_type, | |
2522 | HOST_WIDE_INT otr_token, | |
2523 | tree outer_type, | |
2524 | HOST_WIDE_INT offset, | |
ec77d61f | 2525 | vec <cgraph_node *> &nodes, |
6e2830c3 TS |
2526 | hash_set<tree> *inserted, |
2527 | hash_set<tree> *matched_vtables, | |
68377e53 JH |
2528 | bool *completep) |
2529 | { | |
2530 | while (true) | |
2531 | { | |
2532 | HOST_WIDE_INT pos, size; | |
2533 | tree base_binfo; | |
2534 | tree fld; | |
2535 | ||
2536 | if (types_same_for_odr (outer_type, otr_type)) | |
2537 | return; | |
2538 | ||
2539 | for (fld = TYPE_FIELDS (outer_type); fld; fld = DECL_CHAIN (fld)) | |
2540 | { | |
2541 | if (TREE_CODE (fld) != FIELD_DECL) | |
2542 | continue; | |
2543 | ||
2544 | pos = int_bit_position (fld); | |
2545 | size = tree_to_shwi (DECL_SIZE (fld)); | |
ec77d61f JH |
2546 | if (pos <= offset && (pos + size) > offset |
2547 | /* Do not get confused by zero sized bases. */ | |
2548 | && polymorphic_type_binfo_p (TYPE_BINFO (TREE_TYPE (fld)))) | |
68377e53 JH |
2549 | break; |
2550 | } | |
d6ae9a6d | 2551 | /* Within a class type we should always find corresponding fields. */ |
68377e53 JH |
2552 | gcc_assert (fld && TREE_CODE (TREE_TYPE (fld)) == RECORD_TYPE); |
2553 | ||
d6ae9a6d | 2554 | /* Nonbase types should have been stripped by outer_class_type. */ |
68377e53 JH |
2555 | gcc_assert (DECL_ARTIFICIAL (fld)); |
2556 | ||
2557 | outer_type = TREE_TYPE (fld); | |
2558 | offset -= pos; | |
2559 | ||
2560 | base_binfo = get_binfo_at_offset (TYPE_BINFO (outer_type), | |
2561 | offset, otr_type); | |
ec77d61f JH |
2562 | if (!base_binfo) |
2563 | { | |
2564 | gcc_assert (odr_violation_reported); | |
2565 | return; | |
2566 | } | |
68377e53 | 2567 | gcc_assert (base_binfo); |
6e2830c3 | 2568 | if (!matched_vtables->add (BINFO_VTABLE (base_binfo))) |
68377e53 | 2569 | { |
ec77d61f JH |
2570 | bool can_refer; |
2571 | tree target = gimple_get_virt_method_for_binfo (otr_token, | |
2572 | base_binfo, | |
2573 | &can_refer); | |
2d1644bf JH |
2574 | if (!target || ! DECL_CXX_DESTRUCTOR_P (target)) |
2575 | maybe_record_node (nodes, target, inserted, can_refer, completep); | |
6e2830c3 | 2576 | matched_vtables->add (BINFO_VTABLE (base_binfo)); |
68377e53 JH |
2577 | } |
2578 | } | |
2579 | } | |
2580 | ||
3462aa02 JH |
2581 | /* When virtual table is removed, we may need to flush the cache. */ |
2582 | ||
2583 | static void | |
2c8326a5 | 2584 | devirt_variable_node_removal_hook (varpool_node *n, |
3462aa02 JH |
2585 | void *d ATTRIBUTE_UNUSED) |
2586 | { | |
2587 | if (cached_polymorphic_call_targets | |
67348ccc DM |
2588 | && DECL_VIRTUAL_P (n->decl) |
2589 | && type_in_anonymous_namespace_p (DECL_CONTEXT (n->decl))) | |
3462aa02 JH |
2590 | free_polymorphic_call_targets_hash (); |
2591 | } | |
2592 | ||
91bc34a9 | 2593 | /* Record about how many calls would benefit from given type to be final. */ |
7d0aa05b | 2594 | |
91bc34a9 JH |
2595 | struct odr_type_warn_count |
2596 | { | |
9716cc3e | 2597 | tree type; |
91bc34a9 JH |
2598 | int count; |
2599 | gcov_type dyn_count; | |
2600 | }; | |
2601 | ||
2602 | /* Record about how many calls would benefit from given method to be final. */ | |
7d0aa05b | 2603 | |
91bc34a9 JH |
2604 | struct decl_warn_count |
2605 | { | |
2606 | tree decl; | |
2607 | int count; | |
2608 | gcov_type dyn_count; | |
2609 | }; | |
2610 | ||
2611 | /* Information about type and decl warnings. */ | |
7d0aa05b | 2612 | |
91bc34a9 JH |
2613 | struct final_warning_record |
2614 | { | |
2615 | gcov_type dyn_count; | |
2616 | vec<odr_type_warn_count> type_warnings; | |
2617 | hash_map<tree, decl_warn_count> decl_warnings; | |
2618 | }; | |
2619 | struct final_warning_record *final_warning_records; | |
2620 | ||
eefe9a99 | 2621 | /* Return vector containing possible targets of polymorphic call of type |
d6ae9a6d SL |
2622 | OTR_TYPE calling method OTR_TOKEN within type of OTR_OUTER_TYPE and OFFSET. |
2623 | If INCLUDE_BASES is true, walk also base types of OUTER_TYPES containing | |
68377e53 JH |
2624 | OTR_TYPE and include their virtual method. This is useful for types |
2625 | possibly in construction or destruction where the virtual table may | |
2626 | temporarily change to one of base types. INCLUDE_DERIVER_TYPES make | |
2627 | us to walk the inheritance graph for all derivations. | |
2628 | ||
add5c763 | 2629 | If COMPLETEP is non-NULL, store true if the list is complete. |
eefe9a99 JH |
2630 | CACHE_TOKEN (if non-NULL) will get stored to an unique ID of entry |
2631 | in the target cache. If user needs to visit every target list | |
2632 | just once, it can memoize them. | |
2633 | ||
2f28755f JH |
2634 | If SPECULATIVE is set, the list will not contain targets that |
2635 | are not speculatively taken. | |
ec77d61f | 2636 | |
eefe9a99 JH |
2637 | Returned vector is placed into cache. It is NOT caller's responsibility |
2638 | to free it. The vector can be freed on cgraph_remove_node call if | |
2639 | the particular node is a virtual function present in the cache. */ | |
2640 | ||
2641 | vec <cgraph_node *> | |
2642 | possible_polymorphic_call_targets (tree otr_type, | |
2643 | HOST_WIDE_INT otr_token, | |
68377e53 JH |
2644 | ipa_polymorphic_call_context context, |
2645 | bool *completep, | |
ec77d61f | 2646 | void **cache_token, |
2f28755f | 2647 | bool speculative) |
eefe9a99 JH |
2648 | { |
2649 | static struct cgraph_node_hook_list *node_removal_hook_holder; | |
add5c763 | 2650 | vec <cgraph_node *> nodes = vNULL; |
1be0e58d | 2651 | auto_vec <tree, 8> bases_to_consider; |
68377e53 | 2652 | odr_type type, outer_type; |
eefe9a99 JH |
2653 | polymorphic_call_target_d key; |
2654 | polymorphic_call_target_d **slot; | |
2655 | unsigned int i; | |
2656 | tree binfo, target; | |
ec77d61f | 2657 | bool complete; |
b2d82f2d | 2658 | bool can_refer = false; |
2d1644bf | 2659 | bool skipped = false; |
eefe9a99 | 2660 | |
c7e1befa JH |
2661 | otr_type = TYPE_MAIN_VARIANT (otr_type); |
2662 | ||
d6ae9a6d | 2663 | /* If ODR is not initialized or the context is invalid, return empty |
6f8091fc | 2664 | incomplete list. */ |
b41e0d29 | 2665 | if (!odr_hash || context.invalid || !TYPE_BINFO (otr_type)) |
3e86c6a8 JH |
2666 | { |
2667 | if (completep) | |
6f8091fc | 2668 | *completep = context.invalid; |
beb683ab MJ |
2669 | if (cache_token) |
2670 | *cache_token = NULL; | |
3e86c6a8 JH |
2671 | return nodes; |
2672 | } | |
2673 | ||
91bc34a9 | 2674 | /* Do not bother to compute speculative info when user do not asks for it. */ |
2f28755f | 2675 | if (!speculative || !context.speculative_outer_type) |
4d7cf10d | 2676 | context.clear_speculation (); |
91bc34a9 | 2677 | |
68377e53 | 2678 | type = get_odr_type (otr_type, true); |
eefe9a99 | 2679 | |
d6ae9a6d | 2680 | /* Recording type variants would waste results cache. */ |
c7e1befa JH |
2681 | gcc_assert (!context.outer_type |
2682 | || TYPE_MAIN_VARIANT (context.outer_type) == context.outer_type); | |
2683 | ||
d6ae9a6d | 2684 | /* Look up the outer class type we want to walk. |
a1981458 | 2685 | If we fail to do so, the context is invalid. */ |
a0fd3373 | 2686 | if ((context.outer_type || context.speculative_outer_type) |
4d7cf10d | 2687 | && !context.restrict_to_inner_class (otr_type)) |
3e86c6a8 JH |
2688 | { |
2689 | if (completep) | |
a1981458 | 2690 | *completep = true; |
beb683ab MJ |
2691 | if (cache_token) |
2692 | *cache_token = NULL; | |
3e86c6a8 JH |
2693 | return nodes; |
2694 | } | |
a1981458 | 2695 | gcc_assert (!context.invalid); |
eefe9a99 | 2696 | |
4d7cf10d | 2697 | /* Check that restrict_to_inner_class kept the main variant. */ |
c7e1befa JH |
2698 | gcc_assert (!context.outer_type |
2699 | || TYPE_MAIN_VARIANT (context.outer_type) == context.outer_type); | |
2700 | ||
79c7de84 | 2701 | /* We canonicalize our query, so we do not need extra hashtable entries. */ |
68377e53 JH |
2702 | |
2703 | /* Without outer type, we have no use for offset. Just do the | |
d6ae9a6d | 2704 | basic search from inner type. */ |
68377e53 | 2705 | if (!context.outer_type) |
6ff65dd7 | 2706 | context.clear_outer_type (otr_type); |
d6ae9a6d | 2707 | /* We need to update our hierarchy if the type does not exist. */ |
68377e53 | 2708 | outer_type = get_odr_type (context.outer_type, true); |
ec77d61f | 2709 | /* If the type is complete, there are no derivations. */ |
68377e53 JH |
2710 | if (TYPE_FINAL_P (outer_type->type)) |
2711 | context.maybe_derived_type = false; | |
eefe9a99 JH |
2712 | |
2713 | /* Initialize query cache. */ | |
2714 | if (!cached_polymorphic_call_targets) | |
2715 | { | |
6e2830c3 | 2716 | cached_polymorphic_call_targets = new hash_set<cgraph_node *>; |
c203e8a7 TS |
2717 | polymorphic_call_target_hash |
2718 | = new polymorphic_call_target_hash_type (23); | |
eefe9a99 | 2719 | if (!node_removal_hook_holder) |
3462aa02 JH |
2720 | { |
2721 | node_removal_hook_holder = | |
3dafb85c ML |
2722 | symtab->add_cgraph_removal_hook (&devirt_node_removal_hook, NULL); |
2723 | symtab->add_varpool_removal_hook (&devirt_variable_node_removal_hook, | |
3462aa02 JH |
2724 | NULL); |
2725 | } | |
eefe9a99 JH |
2726 | } |
2727 | ||
21a9ce6e JH |
2728 | if (in_lto_p) |
2729 | { | |
2730 | if (context.outer_type != otr_type) | |
2731 | context.outer_type | |
2732 | = get_odr_type (context.outer_type, true)->type; | |
2733 | if (context.speculative_outer_type) | |
2734 | context.speculative_outer_type | |
2735 | = get_odr_type (context.speculative_outer_type, true)->type; | |
2736 | } | |
2737 | ||
d6ae9a6d | 2738 | /* Look up cached answer. */ |
eefe9a99 JH |
2739 | key.type = type; |
2740 | key.otr_token = otr_token; | |
2f28755f | 2741 | key.speculative = speculative; |
68377e53 | 2742 | key.context = context; |
c203e8a7 | 2743 | slot = polymorphic_call_target_hash->find_slot (&key, INSERT); |
eefe9a99 JH |
2744 | if (cache_token) |
2745 | *cache_token = (void *)*slot; | |
2746 | if (*slot) | |
68377e53 JH |
2747 | { |
2748 | if (completep) | |
ec77d61f | 2749 | *completep = (*slot)->complete; |
91bc34a9 JH |
2750 | if ((*slot)->type_warning && final_warning_records) |
2751 | { | |
2752 | final_warning_records->type_warnings[(*slot)->type_warning - 1].count++; | |
2753 | final_warning_records->type_warnings[(*slot)->type_warning - 1].dyn_count | |
2754 | += final_warning_records->dyn_count; | |
2755 | } | |
2f28755f | 2756 | if (!speculative && (*slot)->decl_warning && final_warning_records) |
91bc34a9 JH |
2757 | { |
2758 | struct decl_warn_count *c = | |
2759 | final_warning_records->decl_warnings.get ((*slot)->decl_warning); | |
2760 | c->count++; | |
2761 | c->dyn_count += final_warning_records->dyn_count; | |
2762 | } | |
68377e53 JH |
2763 | return (*slot)->targets; |
2764 | } | |
2765 | ||
ec77d61f | 2766 | complete = true; |
eefe9a99 JH |
2767 | |
2768 | /* Do actual search. */ | |
2769 | timevar_push (TV_IPA_VIRTUAL_CALL); | |
2770 | *slot = XCNEW (polymorphic_call_target_d); | |
2771 | if (cache_token) | |
68377e53 | 2772 | *cache_token = (void *)*slot; |
eefe9a99 JH |
2773 | (*slot)->type = type; |
2774 | (*slot)->otr_token = otr_token; | |
68377e53 | 2775 | (*slot)->context = context; |
2f28755f | 2776 | (*slot)->speculative = speculative; |
eefe9a99 | 2777 | |
6e2830c3 TS |
2778 | hash_set<tree> inserted; |
2779 | hash_set<tree> matched_vtables; | |
eefe9a99 | 2780 | |
91bc34a9 | 2781 | /* First insert targets we speculatively identified as likely. */ |
a0fd3373 JH |
2782 | if (context.speculative_outer_type) |
2783 | { | |
2784 | odr_type speculative_outer_type; | |
91bc34a9 JH |
2785 | bool speculation_complete = true; |
2786 | ||
d6ae9a6d SL |
2787 | /* First insert target from type itself and check if it may have |
2788 | derived types. */ | |
a0fd3373 JH |
2789 | speculative_outer_type = get_odr_type (context.speculative_outer_type, true); |
2790 | if (TYPE_FINAL_P (speculative_outer_type->type)) | |
2791 | context.speculative_maybe_derived_type = false; | |
2792 | binfo = get_binfo_at_offset (TYPE_BINFO (speculative_outer_type->type), | |
2793 | context.speculative_offset, otr_type); | |
2794 | if (binfo) | |
2795 | target = gimple_get_virt_method_for_binfo (otr_token, binfo, | |
2796 | &can_refer); | |
2797 | else | |
2798 | target = NULL; | |
2799 | ||
91bc34a9 JH |
2800 | /* In the case we get complete method, we don't need |
2801 | to walk derivations. */ | |
2802 | if (target && DECL_FINAL_P (target)) | |
2803 | context.speculative_maybe_derived_type = false; | |
a0fd3373 | 2804 | if (type_possibly_instantiated_p (speculative_outer_type->type)) |
91bc34a9 | 2805 | maybe_record_node (nodes, target, &inserted, can_refer, &speculation_complete); |
a0fd3373 | 2806 | if (binfo) |
6e2830c3 | 2807 | matched_vtables.add (BINFO_VTABLE (binfo)); |
91bc34a9 | 2808 | |
9716cc3e | 2809 | |
a0fd3373 JH |
2810 | /* Next walk recursively all derived types. */ |
2811 | if (context.speculative_maybe_derived_type) | |
91bc34a9 JH |
2812 | for (i = 0; i < speculative_outer_type->derived_types.length(); i++) |
2813 | possible_polymorphic_call_targets_1 (nodes, &inserted, | |
2814 | &matched_vtables, | |
2815 | otr_type, | |
2816 | speculative_outer_type->derived_types[i], | |
2817 | otr_token, speculative_outer_type->type, | |
2818 | context.speculative_offset, | |
2819 | &speculation_complete, | |
2820 | bases_to_consider, | |
2821 | false); | |
a0fd3373 JH |
2822 | } |
2823 | ||
2f28755f | 2824 | if (!speculative || !nodes.length ()) |
68377e53 | 2825 | { |
2f28755f JH |
2826 | /* First see virtual method of type itself. */ |
2827 | binfo = get_binfo_at_offset (TYPE_BINFO (outer_type->type), | |
2828 | context.offset, otr_type); | |
2829 | if (binfo) | |
2830 | target = gimple_get_virt_method_for_binfo (otr_token, binfo, | |
2831 | &can_refer); | |
2832 | else | |
2833 | { | |
2834 | gcc_assert (odr_violation_reported); | |
2835 | target = NULL; | |
2836 | } | |
68377e53 | 2837 | |
2f28755f JH |
2838 | /* Destructors are never called through construction virtual tables, |
2839 | because the type is always known. */ | |
2840 | if (target && DECL_CXX_DESTRUCTOR_P (target)) | |
2841 | context.maybe_in_construction = false; | |
ec77d61f | 2842 | |
2f28755f JH |
2843 | if (target) |
2844 | { | |
2845 | /* In the case we get complete method, we don't need | |
2846 | to walk derivations. */ | |
2847 | if (DECL_FINAL_P (target)) | |
2848 | context.maybe_derived_type = false; | |
2849 | } | |
2d1644bf | 2850 | |
2f28755f JH |
2851 | /* If OUTER_TYPE is abstract, we know we are not seeing its instance. */ |
2852 | if (type_possibly_instantiated_p (outer_type->type)) | |
2853 | maybe_record_node (nodes, target, &inserted, can_refer, &complete); | |
2854 | else | |
2855 | skipped = true; | |
79c7de84 | 2856 | |
2f28755f JH |
2857 | if (binfo) |
2858 | matched_vtables.add (BINFO_VTABLE (binfo)); | |
eefe9a99 | 2859 | |
2f28755f JH |
2860 | /* Next walk recursively all derived types. */ |
2861 | if (context.maybe_derived_type) | |
91bc34a9 | 2862 | { |
2f28755f JH |
2863 | for (i = 0; i < outer_type->derived_types.length(); i++) |
2864 | possible_polymorphic_call_targets_1 (nodes, &inserted, | |
2865 | &matched_vtables, | |
2866 | otr_type, | |
2867 | outer_type->derived_types[i], | |
2868 | otr_token, outer_type->type, | |
2869 | context.offset, &complete, | |
2870 | bases_to_consider, | |
2871 | context.maybe_in_construction); | |
2872 | ||
2873 | if (!outer_type->all_derivations_known) | |
91bc34a9 | 2874 | { |
2f28755f | 2875 | if (!speculative && final_warning_records) |
91bc34a9 | 2876 | { |
2f28755f JH |
2877 | if (complete |
2878 | && nodes.length () == 1 | |
2879 | && warn_suggest_final_types | |
2880 | && !outer_type->derived_types.length ()) | |
91bc34a9 | 2881 | { |
2f28755f JH |
2882 | if (outer_type->id >= (int)final_warning_records->type_warnings.length ()) |
2883 | final_warning_records->type_warnings.safe_grow_cleared | |
2884 | (odr_types.length ()); | |
2885 | final_warning_records->type_warnings[outer_type->id].count++; | |
2886 | final_warning_records->type_warnings[outer_type->id].dyn_count | |
2887 | += final_warning_records->dyn_count; | |
2888 | final_warning_records->type_warnings[outer_type->id].type | |
2889 | = outer_type->type; | |
2890 | (*slot)->type_warning = outer_type->id + 1; | |
91bc34a9 | 2891 | } |
2f28755f JH |
2892 | if (complete |
2893 | && warn_suggest_final_methods | |
2894 | && nodes.length () == 1 | |
2895 | && types_same_for_odr (DECL_CONTEXT (nodes[0]->decl), | |
2896 | outer_type->type)) | |
91bc34a9 | 2897 | { |
2f28755f JH |
2898 | bool existed; |
2899 | struct decl_warn_count &c = | |
2900 | final_warning_records->decl_warnings.get_or_insert | |
2901 | (nodes[0]->decl, &existed); | |
2902 | ||
2903 | if (existed) | |
2904 | { | |
2905 | c.count++; | |
2906 | c.dyn_count += final_warning_records->dyn_count; | |
2907 | } | |
2908 | else | |
2909 | { | |
2910 | c.count = 1; | |
2911 | c.dyn_count = final_warning_records->dyn_count; | |
2912 | c.decl = nodes[0]->decl; | |
2913 | } | |
2914 | (*slot)->decl_warning = nodes[0]->decl; | |
91bc34a9 | 2915 | } |
91bc34a9 | 2916 | } |
2f28755f | 2917 | complete = false; |
91bc34a9 | 2918 | } |
91bc34a9 | 2919 | } |
2d1644bf | 2920 | |
2f28755f JH |
2921 | if (!speculative) |
2922 | { | |
2923 | /* Destructors are never called through construction virtual tables, | |
d6ae9a6d SL |
2924 | because the type is always known. One of entries may be |
2925 | cxa_pure_virtual so look to at least two of them. */ | |
2f28755f JH |
2926 | if (context.maybe_in_construction) |
2927 | for (i =0 ; i < MIN (nodes.length (), 2); i++) | |
2928 | if (DECL_CXX_DESTRUCTOR_P (nodes[i]->decl)) | |
2929 | context.maybe_in_construction = false; | |
2930 | if (context.maybe_in_construction) | |
2931 | { | |
2932 | if (type != outer_type | |
2933 | && (!skipped | |
2934 | || (context.maybe_derived_type | |
2935 | && !type_all_derivations_known_p (outer_type->type)))) | |
2936 | record_targets_from_bases (otr_type, otr_token, outer_type->type, | |
2937 | context.offset, nodes, &inserted, | |
2938 | &matched_vtables, &complete); | |
2939 | if (skipped) | |
2940 | maybe_record_node (nodes, target, &inserted, can_refer, &complete); | |
2941 | for (i = 0; i < bases_to_consider.length(); i++) | |
2942 | maybe_record_node (nodes, bases_to_consider[i], &inserted, can_refer, &complete); | |
2943 | } | |
2944 | } | |
2d1644bf | 2945 | } |
ec77d61f | 2946 | |
eefe9a99 | 2947 | (*slot)->targets = nodes; |
ec77d61f | 2948 | (*slot)->complete = complete; |
68377e53 | 2949 | if (completep) |
ec77d61f | 2950 | *completep = complete; |
eefe9a99 | 2951 | |
eefe9a99 JH |
2952 | timevar_pop (TV_IPA_VIRTUAL_CALL); |
2953 | return nodes; | |
2954 | } | |
2955 | ||
91bc34a9 JH |
2956 | bool |
2957 | add_decl_warning (const tree &key ATTRIBUTE_UNUSED, const decl_warn_count &value, | |
2958 | vec<const decl_warn_count*> *vec) | |
2959 | { | |
2960 | vec->safe_push (&value); | |
2961 | return true; | |
2962 | } | |
2963 | ||
2f28755f JH |
2964 | /* Dump target list TARGETS into FILE. */ |
2965 | ||
2966 | static void | |
2967 | dump_targets (FILE *f, vec <cgraph_node *> targets) | |
2968 | { | |
2969 | unsigned int i; | |
2970 | ||
2971 | for (i = 0; i < targets.length (); i++) | |
2972 | { | |
2973 | char *name = NULL; | |
2974 | if (in_lto_p) | |
2975 | name = cplus_demangle_v3 (targets[i]->asm_name (), 0); | |
2976 | fprintf (f, " %s/%i", name ? name : targets[i]->name (), targets[i]->order); | |
2977 | if (in_lto_p) | |
2978 | free (name); | |
2979 | if (!targets[i]->definition) | |
2980 | fprintf (f, " (no definition%s)", | |
2981 | DECL_DECLARED_INLINE_P (targets[i]->decl) | |
2982 | ? " inline" : ""); | |
2983 | } | |
2984 | fprintf (f, "\n"); | |
2985 | } | |
2986 | ||
eefe9a99 JH |
2987 | /* Dump all possible targets of a polymorphic call. */ |
2988 | ||
2989 | void | |
2990 | dump_possible_polymorphic_call_targets (FILE *f, | |
68377e53 JH |
2991 | tree otr_type, |
2992 | HOST_WIDE_INT otr_token, | |
2993 | const ipa_polymorphic_call_context &ctx) | |
eefe9a99 JH |
2994 | { |
2995 | vec <cgraph_node *> targets; | |
2996 | bool final; | |
549bcbd1 | 2997 | odr_type type = get_odr_type (TYPE_MAIN_VARIANT (otr_type), false); |
2f28755f | 2998 | unsigned int len; |
eefe9a99 JH |
2999 | |
3000 | if (!type) | |
3001 | return; | |
3002 | targets = possible_polymorphic_call_targets (otr_type, otr_token, | |
68377e53 | 3003 | ctx, |
2f28755f | 3004 | &final, NULL, false); |
68377e53 | 3005 | fprintf (f, " Targets of polymorphic call of type %i:", type->id); |
eefe9a99 | 3006 | print_generic_expr (f, type->type, TDF_SLIM); |
ec77d61f | 3007 | fprintf (f, " token %i\n", (int)otr_token); |
a1981458 JH |
3008 | |
3009 | ctx.dump (f); | |
ec77d61f | 3010 | |
a0fd3373 | 3011 | fprintf (f, " %s%s%s%s\n ", |
ec77d61f | 3012 | final ? "This is a complete list." : |
68377e53 JH |
3013 | "This is partial list; extra targets may be defined in other units.", |
3014 | ctx.maybe_in_construction ? " (base types included)" : "", | |
a0fd3373 JH |
3015 | ctx.maybe_derived_type ? " (derived types included)" : "", |
3016 | ctx.speculative_maybe_derived_type ? " (speculative derived types included)" : ""); | |
2f28755f JH |
3017 | len = targets.length (); |
3018 | dump_targets (f, targets); | |
3019 | ||
3020 | targets = possible_polymorphic_call_targets (otr_type, otr_token, | |
3021 | ctx, | |
3022 | &final, NULL, true); | |
2f28755f | 3023 | if (targets.length () != len) |
ec77d61f | 3024 | { |
2f28755f JH |
3025 | fprintf (f, " Speculative targets:"); |
3026 | dump_targets (f, targets); | |
ec77d61f | 3027 | } |
609570b4 | 3028 | gcc_assert (targets.length () <= len); |
2f28755f | 3029 | fprintf (f, "\n"); |
eefe9a99 JH |
3030 | } |
3031 | ||
0e1474e5 JH |
3032 | |
3033 | /* Return true if N can be possibly target of a polymorphic call of | |
3034 | OTR_TYPE/OTR_TOKEN. */ | |
3035 | ||
3036 | bool | |
3037 | possible_polymorphic_call_target_p (tree otr_type, | |
3038 | HOST_WIDE_INT otr_token, | |
68377e53 | 3039 | const ipa_polymorphic_call_context &ctx, |
0e1474e5 JH |
3040 | struct cgraph_node *n) |
3041 | { | |
3042 | vec <cgraph_node *> targets; | |
3043 | unsigned int i; | |
68377e53 | 3044 | enum built_in_function fcode; |
450ad0cd | 3045 | bool final; |
0e1474e5 | 3046 | |
68377e53 JH |
3047 | if (TREE_CODE (TREE_TYPE (n->decl)) == FUNCTION_TYPE |
3048 | && ((fcode = DECL_FUNCTION_CODE (n->decl)) | |
3049 | == BUILT_IN_UNREACHABLE | |
3050 | || fcode == BUILT_IN_TRAP)) | |
3051 | return true; | |
3052 | ||
c203e8a7 | 3053 | if (!odr_hash) |
0e1474e5 | 3054 | return true; |
68377e53 | 3055 | targets = possible_polymorphic_call_targets (otr_type, otr_token, ctx, &final); |
0e1474e5 | 3056 | for (i = 0; i < targets.length (); i++) |
d52f5295 | 3057 | if (n->semantically_equivalent_p (targets[i])) |
0e1474e5 | 3058 | return true; |
450ad0cd JH |
3059 | |
3060 | /* At a moment we allow middle end to dig out new external declarations | |
3061 | as a targets of polymorphic calls. */ | |
67348ccc | 3062 | if (!final && !n->definition) |
450ad0cd | 3063 | return true; |
0e1474e5 JH |
3064 | return false; |
3065 | } | |
3066 | ||
3067 | ||
6f8091fc JH |
3068 | |
3069 | /* Return true if N can be possibly target of a polymorphic call of | |
3070 | OBJ_TYPE_REF expression REF in STMT. */ | |
3071 | ||
3072 | bool | |
3073 | possible_polymorphic_call_target_p (tree ref, | |
3074 | gimple stmt, | |
3075 | struct cgraph_node *n) | |
3076 | { | |
3077 | ipa_polymorphic_call_context context (current_function_decl, ref, stmt); | |
3078 | tree call_fn = gimple_call_fn (stmt); | |
3079 | ||
3080 | return possible_polymorphic_call_target_p (obj_type_ref_class (call_fn), | |
3081 | tree_to_uhwi | |
3082 | (OBJ_TYPE_REF_TOKEN (call_fn)), | |
3083 | context, | |
3084 | n); | |
3085 | } | |
3086 | ||
3087 | ||
0e1474e5 JH |
3088 | /* After callgraph construction new external nodes may appear. |
3089 | Add them into the graph. */ | |
3090 | ||
3091 | void | |
3092 | update_type_inheritance_graph (void) | |
3093 | { | |
3094 | struct cgraph_node *n; | |
3095 | ||
c203e8a7 | 3096 | if (!odr_hash) |
0e1474e5 JH |
3097 | return; |
3098 | free_polymorphic_call_targets_hash (); | |
3099 | timevar_push (TV_IPA_INHERITANCE); | |
68377e53 | 3100 | /* We reconstruct the graph starting from types of all methods seen in the |
0e1474e5 JH |
3101 | the unit. */ |
3102 | FOR_EACH_FUNCTION (n) | |
67348ccc DM |
3103 | if (DECL_VIRTUAL_P (n->decl) |
3104 | && !n->definition | |
d52f5295 | 3105 | && n->real_symbol_p ()) |
549bcbd1 JH |
3106 | get_odr_type (method_class_type (TYPE_MAIN_VARIANT (TREE_TYPE (n->decl))), |
3107 | true); | |
0e1474e5 JH |
3108 | timevar_pop (TV_IPA_INHERITANCE); |
3109 | } | |
bbc9396b JH |
3110 | |
3111 | ||
3112 | /* Return true if N looks like likely target of a polymorphic call. | |
3113 | Rule out cxa_pure_virtual, noreturns, function declared cold and | |
3114 | other obvious cases. */ | |
3115 | ||
3116 | bool | |
3117 | likely_target_p (struct cgraph_node *n) | |
3118 | { | |
3119 | int flags; | |
3120 | /* cxa_pure_virtual and similar things are not likely. */ | |
67348ccc | 3121 | if (TREE_CODE (TREE_TYPE (n->decl)) != METHOD_TYPE) |
bbc9396b | 3122 | return false; |
67348ccc | 3123 | flags = flags_from_decl_or_type (n->decl); |
bbc9396b JH |
3124 | if (flags & ECF_NORETURN) |
3125 | return false; | |
3126 | if (lookup_attribute ("cold", | |
67348ccc | 3127 | DECL_ATTRIBUTES (n->decl))) |
bbc9396b JH |
3128 | return false; |
3129 | if (n->frequency < NODE_FREQUENCY_NORMAL) | |
3130 | return false; | |
d6ae9a6d SL |
3131 | /* If there are no live virtual tables referring the target, |
3132 | the only way the target can be called is an instance coming from other | |
3133 | compilation unit; speculative devirtualization is built around an | |
ccb05ef2 JH |
3134 | assumption that won't happen. */ |
3135 | if (!referenced_from_vtable_p (n)) | |
3136 | return false; | |
bbc9396b JH |
3137 | return true; |
3138 | } | |
3139 | ||
d6ae9a6d | 3140 | /* Compare type warning records P1 and P2 and choose one with larger count; |
91bc34a9 JH |
3141 | helper for qsort. */ |
3142 | ||
3143 | int | |
3144 | type_warning_cmp (const void *p1, const void *p2) | |
3145 | { | |
3146 | const odr_type_warn_count *t1 = (const odr_type_warn_count *)p1; | |
3147 | const odr_type_warn_count *t2 = (const odr_type_warn_count *)p2; | |
3148 | ||
3149 | if (t1->dyn_count < t2->dyn_count) | |
3150 | return 1; | |
3151 | if (t1->dyn_count > t2->dyn_count) | |
3152 | return -1; | |
3153 | return t2->count - t1->count; | |
3154 | } | |
3155 | ||
d6ae9a6d | 3156 | /* Compare decl warning records P1 and P2 and choose one with larger count; |
91bc34a9 JH |
3157 | helper for qsort. */ |
3158 | ||
3159 | int | |
3160 | decl_warning_cmp (const void *p1, const void *p2) | |
3161 | { | |
3162 | const decl_warn_count *t1 = *(const decl_warn_count * const *)p1; | |
3163 | const decl_warn_count *t2 = *(const decl_warn_count * const *)p2; | |
3164 | ||
3165 | if (t1->dyn_count < t2->dyn_count) | |
3166 | return 1; | |
3167 | if (t1->dyn_count > t2->dyn_count) | |
3168 | return -1; | |
3169 | return t2->count - t1->count; | |
3170 | } | |
3171 | ||
5ce97055 | 3172 | |
d6ae9a6d | 3173 | /* Try to speculatively devirtualize call to OTR_TYPE with OTR_TOKEN with |
5ce97055 JH |
3174 | context CTX. */ |
3175 | ||
3176 | struct cgraph_node * | |
3177 | try_speculative_devirtualization (tree otr_type, HOST_WIDE_INT otr_token, | |
3178 | ipa_polymorphic_call_context ctx) | |
3179 | { | |
3180 | vec <cgraph_node *>targets | |
3181 | = possible_polymorphic_call_targets | |
3182 | (otr_type, otr_token, ctx, NULL, NULL, true); | |
3183 | unsigned int i; | |
3184 | struct cgraph_node *likely_target = NULL; | |
3185 | ||
3186 | for (i = 0; i < targets.length (); i++) | |
3187 | if (likely_target_p (targets[i])) | |
3188 | { | |
3189 | if (likely_target) | |
3190 | return NULL; | |
3191 | likely_target = targets[i]; | |
3192 | } | |
3193 | if (!likely_target | |
3194 | ||!likely_target->definition | |
3195 | || DECL_EXTERNAL (likely_target->decl)) | |
3196 | return NULL; | |
3197 | ||
3198 | /* Don't use an implicitly-declared destructor (c++/58678). */ | |
3199 | struct cgraph_node *non_thunk_target | |
3200 | = likely_target->function_symbol (); | |
3201 | if (DECL_ARTIFICIAL (non_thunk_target->decl)) | |
3202 | return NULL; | |
3203 | if (likely_target->get_availability () <= AVAIL_INTERPOSABLE | |
3204 | && likely_target->can_be_discarded_p ()) | |
3205 | return NULL; | |
3206 | return likely_target; | |
3207 | } | |
3208 | ||
bbc9396b | 3209 | /* The ipa-devirt pass. |
3462aa02 | 3210 | When polymorphic call has only one likely target in the unit, |
d6ae9a6d | 3211 | turn it into a speculative call. */ |
bbc9396b JH |
3212 | |
3213 | static unsigned int | |
3214 | ipa_devirt (void) | |
3215 | { | |
3216 | struct cgraph_node *n; | |
6e2830c3 | 3217 | hash_set<void *> bad_call_targets; |
bbc9396b JH |
3218 | struct cgraph_edge *e; |
3219 | ||
3220 | int npolymorphic = 0, nspeculated = 0, nconverted = 0, ncold = 0; | |
3221 | int nmultiple = 0, noverwritable = 0, ndevirtualized = 0, nnotdefined = 0; | |
570215f9 | 3222 | int nwrong = 0, nok = 0, nexternal = 0, nartificial = 0; |
68c9467f | 3223 | int ndropped = 0; |
bbc9396b | 3224 | |
4cd5658b MT |
3225 | if (!odr_types_ptr) |
3226 | return 0; | |
3227 | ||
609570b4 JH |
3228 | if (dump_file) |
3229 | dump_type_inheritance_graph (dump_file); | |
3230 | ||
91bc34a9 JH |
3231 | /* We can output -Wsuggest-final-methods and -Wsuggest-final-types warnings. |
3232 | This is implemented by setting up final_warning_records that are updated | |
3233 | by get_polymorphic_call_targets. | |
3234 | We need to clear cache in this case to trigger recomputation of all | |
3235 | entries. */ | |
3236 | if (warn_suggest_final_methods || warn_suggest_final_types) | |
3237 | { | |
3238 | final_warning_records = new (final_warning_record); | |
3239 | final_warning_records->type_warnings = vNULL; | |
3240 | final_warning_records->type_warnings.safe_grow_cleared (odr_types.length ()); | |
3241 | free_polymorphic_call_targets_hash (); | |
3242 | } | |
3243 | ||
bbc9396b JH |
3244 | FOR_EACH_DEFINED_FUNCTION (n) |
3245 | { | |
3246 | bool update = false; | |
2bf86c84 JH |
3247 | if (!opt_for_fn (n->decl, flag_devirtualize)) |
3248 | continue; | |
bbc9396b JH |
3249 | if (dump_file && n->indirect_calls) |
3250 | fprintf (dump_file, "\n\nProcesing function %s/%i\n", | |
fec39fa6 | 3251 | n->name (), n->order); |
bbc9396b JH |
3252 | for (e = n->indirect_calls; e; e = e->next_callee) |
3253 | if (e->indirect_info->polymorphic) | |
3254 | { | |
3255 | struct cgraph_node *likely_target = NULL; | |
3256 | void *cache_token; | |
3257 | bool final; | |
91bc34a9 JH |
3258 | |
3259 | if (final_warning_records) | |
3260 | final_warning_records->dyn_count = e->count; | |
3261 | ||
bbc9396b JH |
3262 | vec <cgraph_node *>targets |
3263 | = possible_polymorphic_call_targets | |
2f28755f | 3264 | (e, &final, &cache_token, true); |
bbc9396b JH |
3265 | unsigned int i; |
3266 | ||
2f28755f JH |
3267 | /* Trigger warnings by calculating non-speculative targets. */ |
3268 | if (warn_suggest_final_methods || warn_suggest_final_types) | |
3269 | possible_polymorphic_call_targets (e); | |
3270 | ||
bbc9396b JH |
3271 | if (dump_file) |
3272 | dump_possible_polymorphic_call_targets | |
3273 | (dump_file, e); | |
3462aa02 | 3274 | |
bbc9396b JH |
3275 | npolymorphic++; |
3276 | ||
68c9467f JH |
3277 | /* See if the call can be devirtualized by means of ipa-prop's |
3278 | polymorphic call context propagation. If not, we can just | |
3279 | forget about this call being polymorphic and avoid some heavy | |
3280 | lifting in remove_unreachable_nodes that will otherwise try to | |
3281 | keep all possible targets alive until inlining and in the inliner | |
3282 | itself. | |
3283 | ||
3284 | This may need to be revisited once we add further ways to use | |
3285 | the may edges, but it is a resonable thing to do right now. */ | |
3286 | ||
3287 | if ((e->indirect_info->param_index == -1 | |
3288 | || (!opt_for_fn (n->decl, flag_devirtualize_speculatively) | |
3289 | && e->indirect_info->vptr_changed)) | |
3290 | && !flag_ltrans_devirtualize) | |
3291 | { | |
3292 | e->indirect_info->polymorphic = false; | |
3293 | ndropped++; | |
3294 | if (dump_file) | |
3295 | fprintf (dump_file, "Dropping polymorphic call info;" | |
3296 | " it can not be used by ipa-prop\n"); | |
3297 | } | |
3298 | ||
2bf86c84 | 3299 | if (!opt_for_fn (n->decl, flag_devirtualize_speculatively)) |
91bc34a9 JH |
3300 | continue; |
3301 | ||
3dafb85c | 3302 | if (!e->maybe_hot_p ()) |
bbc9396b JH |
3303 | { |
3304 | if (dump_file) | |
ec77d61f | 3305 | fprintf (dump_file, "Call is cold\n\n"); |
bbc9396b JH |
3306 | ncold++; |
3307 | continue; | |
3308 | } | |
3309 | if (e->speculative) | |
3310 | { | |
3311 | if (dump_file) | |
d6ae9a6d | 3312 | fprintf (dump_file, "Call is already speculated\n\n"); |
bbc9396b JH |
3313 | nspeculated++; |
3314 | ||
3315 | /* When dumping see if we agree with speculation. */ | |
3316 | if (!dump_file) | |
3317 | continue; | |
3318 | } | |
6e2830c3 | 3319 | if (bad_call_targets.contains (cache_token)) |
bbc9396b JH |
3320 | { |
3321 | if (dump_file) | |
ec77d61f | 3322 | fprintf (dump_file, "Target list is known to be useless\n\n"); |
bbc9396b JH |
3323 | nmultiple++; |
3324 | continue; | |
3325 | } | |
c3284718 | 3326 | for (i = 0; i < targets.length (); i++) |
bbc9396b JH |
3327 | if (likely_target_p (targets[i])) |
3328 | { | |
3329 | if (likely_target) | |
3330 | { | |
2f28755f JH |
3331 | likely_target = NULL; |
3332 | if (dump_file) | |
3333 | fprintf (dump_file, "More than one likely target\n\n"); | |
3334 | nmultiple++; | |
bbc9396b JH |
3335 | break; |
3336 | } | |
3337 | likely_target = targets[i]; | |
3338 | } | |
3339 | if (!likely_target) | |
3340 | { | |
6e2830c3 | 3341 | bad_call_targets.add (cache_token); |
bbc9396b JH |
3342 | continue; |
3343 | } | |
3344 | /* This is reached only when dumping; check if we agree or disagree | |
3345 | with the speculation. */ | |
3346 | if (e->speculative) | |
3347 | { | |
3348 | struct cgraph_edge *e2; | |
3349 | struct ipa_ref *ref; | |
3dafb85c | 3350 | e->speculative_call_info (e2, e, ref); |
d52f5295 ML |
3351 | if (e2->callee->ultimate_alias_target () |
3352 | == likely_target->ultimate_alias_target ()) | |
bbc9396b | 3353 | { |
ec77d61f | 3354 | fprintf (dump_file, "We agree with speculation\n\n"); |
bbc9396b JH |
3355 | nok++; |
3356 | } | |
3357 | else | |
3358 | { | |
ec77d61f | 3359 | fprintf (dump_file, "We disagree with speculation\n\n"); |
bbc9396b JH |
3360 | nwrong++; |
3361 | } | |
3362 | continue; | |
3363 | } | |
67348ccc | 3364 | if (!likely_target->definition) |
bbc9396b JH |
3365 | { |
3366 | if (dump_file) | |
d6ae9a6d | 3367 | fprintf (dump_file, "Target is not a definition\n\n"); |
bbc9396b JH |
3368 | nnotdefined++; |
3369 | continue; | |
3370 | } | |
3371 | /* Do not introduce new references to external symbols. While we | |
3372 | can handle these just well, it is common for programs to | |
3373 | incorrectly with headers defining methods they are linked | |
3374 | with. */ | |
67348ccc | 3375 | if (DECL_EXTERNAL (likely_target->decl)) |
bbc9396b JH |
3376 | { |
3377 | if (dump_file) | |
ec77d61f | 3378 | fprintf (dump_file, "Target is external\n\n"); |
bbc9396b JH |
3379 | nexternal++; |
3380 | continue; | |
3381 | } | |
570215f9 JM |
3382 | /* Don't use an implicitly-declared destructor (c++/58678). */ |
3383 | struct cgraph_node *non_thunk_target | |
d52f5295 | 3384 | = likely_target->function_symbol (); |
89632536 | 3385 | if (DECL_ARTIFICIAL (non_thunk_target->decl)) |
570215f9 JM |
3386 | { |
3387 | if (dump_file) | |
3388 | fprintf (dump_file, "Target is artificial\n\n"); | |
3389 | nartificial++; | |
3390 | continue; | |
3391 | } | |
d52f5295 ML |
3392 | if (likely_target->get_availability () <= AVAIL_INTERPOSABLE |
3393 | && likely_target->can_be_discarded_p ()) | |
bbc9396b JH |
3394 | { |
3395 | if (dump_file) | |
ec77d61f | 3396 | fprintf (dump_file, "Target is overwritable\n\n"); |
bbc9396b JH |
3397 | noverwritable++; |
3398 | continue; | |
3399 | } | |
2b5f0895 | 3400 | else if (dbg_cnt (devirt)) |
bbc9396b | 3401 | { |
2b5f0895 XDL |
3402 | if (dump_enabled_p ()) |
3403 | { | |
807b7d62 | 3404 | location_t locus = gimple_location_safe (e->call_stmt); |
2b5f0895 XDL |
3405 | dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, locus, |
3406 | "speculatively devirtualizing call in %s/%i to %s/%i\n", | |
3407 | n->name (), n->order, | |
3408 | likely_target->name (), | |
3409 | likely_target->order); | |
3410 | } | |
d52f5295 | 3411 | if (!likely_target->can_be_discarded_p ()) |
5b79657a JH |
3412 | { |
3413 | cgraph_node *alias; | |
d52f5295 | 3414 | alias = dyn_cast<cgraph_node *> (likely_target->noninterposable_alias ()); |
5b79657a JH |
3415 | if (alias) |
3416 | likely_target = alias; | |
3417 | } | |
bbc9396b JH |
3418 | nconverted++; |
3419 | update = true; | |
3dafb85c ML |
3420 | e->make_speculative |
3421 | (likely_target, e->count * 8 / 10, e->frequency * 8 / 10); | |
bbc9396b JH |
3422 | } |
3423 | } | |
3424 | if (update) | |
3425 | inline_update_overall_summary (n); | |
3426 | } | |
91bc34a9 JH |
3427 | if (warn_suggest_final_methods || warn_suggest_final_types) |
3428 | { | |
3429 | if (warn_suggest_final_types) | |
3430 | { | |
3431 | final_warning_records->type_warnings.qsort (type_warning_cmp); | |
3432 | for (unsigned int i = 0; | |
3433 | i < final_warning_records->type_warnings.length (); i++) | |
3434 | if (final_warning_records->type_warnings[i].count) | |
3435 | { | |
9716cc3e | 3436 | tree type = final_warning_records->type_warnings[i].type; |
26e82579 JH |
3437 | int count = final_warning_records->type_warnings[i].count; |
3438 | long long dyn_count | |
3439 | = final_warning_records->type_warnings[i].dyn_count; | |
3440 | ||
3441 | if (!dyn_count) | |
3442 | warning_n (DECL_SOURCE_LOCATION (TYPE_NAME (type)), | |
3443 | OPT_Wsuggest_final_types, count, | |
3444 | "Declaring type %qD final " | |
3445 | "would enable devirtualization of %i call", | |
3446 | "Declaring type %qD final " | |
3447 | "would enable devirtualization of %i calls", | |
3448 | type, | |
3449 | count); | |
3450 | else | |
3451 | warning_n (DECL_SOURCE_LOCATION (TYPE_NAME (type)), | |
3452 | OPT_Wsuggest_final_types, count, | |
3453 | "Declaring type %qD final " | |
3454 | "would enable devirtualization of %i call " | |
3455 | "executed %lli times", | |
3456 | "Declaring type %qD final " | |
3457 | "would enable devirtualization of %i calls " | |
3458 | "executed %lli times", | |
3459 | type, | |
3460 | count, | |
3461 | dyn_count); | |
91bc34a9 JH |
3462 | } |
3463 | } | |
3464 | ||
3465 | if (warn_suggest_final_methods) | |
3466 | { | |
3467 | vec<const decl_warn_count*> decl_warnings_vec = vNULL; | |
3468 | ||
3469 | final_warning_records->decl_warnings.traverse | |
3470 | <vec<const decl_warn_count *> *, add_decl_warning> (&decl_warnings_vec); | |
3471 | decl_warnings_vec.qsort (decl_warning_cmp); | |
3472 | for (unsigned int i = 0; i < decl_warnings_vec.length (); i++) | |
3473 | { | |
3474 | tree decl = decl_warnings_vec[i]->decl; | |
3475 | int count = decl_warnings_vec[i]->count; | |
26e82579 JH |
3476 | long long dyn_count = decl_warnings_vec[i]->dyn_count; |
3477 | ||
3478 | if (!dyn_count) | |
3479 | if (DECL_CXX_DESTRUCTOR_P (decl)) | |
3480 | warning_n (DECL_SOURCE_LOCATION (decl), | |
3481 | OPT_Wsuggest_final_methods, count, | |
3482 | "Declaring virtual destructor of %qD final " | |
3483 | "would enable devirtualization of %i call", | |
3484 | "Declaring virtual destructor of %qD final " | |
3485 | "would enable devirtualization of %i calls", | |
3486 | DECL_CONTEXT (decl), count); | |
3487 | else | |
3488 | warning_n (DECL_SOURCE_LOCATION (decl), | |
3489 | OPT_Wsuggest_final_methods, count, | |
3490 | "Declaring method %qD final " | |
3491 | "would enable devirtualization of %i call", | |
3492 | "Declaring method %qD final " | |
3493 | "would enable devirtualization of %i calls", | |
3494 | decl, count); | |
3495 | else if (DECL_CXX_DESTRUCTOR_P (decl)) | |
3496 | warning_n (DECL_SOURCE_LOCATION (decl), | |
3497 | OPT_Wsuggest_final_methods, count, | |
3498 | "Declaring virtual destructor of %qD final " | |
3499 | "would enable devirtualization of %i call " | |
3500 | "executed %lli times", | |
3501 | "Declaring virtual destructor of %qD final " | |
3502 | "would enable devirtualization of %i calls " | |
3503 | "executed %lli times", | |
3504 | DECL_CONTEXT (decl), count, dyn_count); | |
3505 | else | |
3506 | warning_n (DECL_SOURCE_LOCATION (decl), | |
3507 | OPT_Wsuggest_final_methods, count, | |
3508 | "Declaring method %qD final " | |
3509 | "would enable devirtualization of %i call " | |
3510 | "executed %lli times", | |
3511 | "Declaring method %qD final " | |
3512 | "would enable devirtualization of %i calls " | |
3513 | "executed %lli times", | |
3514 | decl, count, dyn_count); | |
91bc34a9 JH |
3515 | } |
3516 | } | |
3517 | ||
3518 | delete (final_warning_records); | |
3519 | final_warning_records = 0; | |
3520 | } | |
bbc9396b JH |
3521 | |
3522 | if (dump_file) | |
3523 | fprintf (dump_file, | |
3524 | "%i polymorphic calls, %i devirtualized," | |
3525 | " %i speculatively devirtualized, %i cold\n" | |
3526 | "%i have multiple targets, %i overwritable," | |
3527 | " %i already speculated (%i agree, %i disagree)," | |
68c9467f | 3528 | " %i external, %i not defined, %i artificial, %i infos dropped\n", |
bbc9396b JH |
3529 | npolymorphic, ndevirtualized, nconverted, ncold, |
3530 | nmultiple, noverwritable, nspeculated, nok, nwrong, | |
68c9467f JH |
3531 | nexternal, nnotdefined, nartificial, ndropped); |
3532 | return ndevirtualized || ndropped ? TODO_remove_functions : 0; | |
bbc9396b JH |
3533 | } |
3534 | ||
bbc9396b JH |
3535 | namespace { |
3536 | ||
3537 | const pass_data pass_data_ipa_devirt = | |
3538 | { | |
3539 | IPA_PASS, /* type */ | |
3540 | "devirt", /* name */ | |
3541 | OPTGROUP_NONE, /* optinfo_flags */ | |
bbc9396b JH |
3542 | TV_IPA_DEVIRT, /* tv_id */ |
3543 | 0, /* properties_required */ | |
3544 | 0, /* properties_provided */ | |
3545 | 0, /* properties_destroyed */ | |
3546 | 0, /* todo_flags_start */ | |
3547 | ( TODO_dump_symtab ), /* todo_flags_finish */ | |
3548 | }; | |
3549 | ||
3550 | class pass_ipa_devirt : public ipa_opt_pass_d | |
3551 | { | |
3552 | public: | |
c3284718 RS |
3553 | pass_ipa_devirt (gcc::context *ctxt) |
3554 | : ipa_opt_pass_d (pass_data_ipa_devirt, ctxt, | |
3555 | NULL, /* generate_summary */ | |
3556 | NULL, /* write_summary */ | |
3557 | NULL, /* read_summary */ | |
3558 | NULL, /* write_optimization_summary */ | |
3559 | NULL, /* read_optimization_summary */ | |
3560 | NULL, /* stmt_fixup */ | |
3561 | 0, /* function_transform_todo_flags_start */ | |
3562 | NULL, /* function_transform */ | |
3563 | NULL) /* variable_transform */ | |
bbc9396b JH |
3564 | {} |
3565 | ||
3566 | /* opt_pass methods: */ | |
1a3d085c TS |
3567 | virtual bool gate (function *) |
3568 | { | |
2bf86c84 JH |
3569 | /* In LTO, always run the IPA passes and decide on function basis if the |
3570 | pass is enabled. */ | |
3571 | if (in_lto_p) | |
3572 | return true; | |
1a3d085c | 3573 | return (flag_devirtualize |
91bc34a9 JH |
3574 | && (flag_devirtualize_speculatively |
3575 | || (warn_suggest_final_methods | |
3576 | || warn_suggest_final_types)) | |
1a3d085c TS |
3577 | && optimize); |
3578 | } | |
3579 | ||
be55bfe6 | 3580 | virtual unsigned int execute (function *) { return ipa_devirt (); } |
bbc9396b JH |
3581 | |
3582 | }; // class pass_ipa_devirt | |
3583 | ||
3584 | } // anon namespace | |
3585 | ||
3586 | ipa_opt_pass_d * | |
3587 | make_pass_ipa_devirt (gcc::context *ctxt) | |
3588 | { | |
3589 | return new pass_ipa_devirt (ctxt); | |
3590 | } | |
3591 | ||
eefe9a99 | 3592 | #include "gt-ipa-devirt.h" |