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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 | |
64 | BINFO_VTABLE of base binfos (that differs of BINFO_VTABLE of | |
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 JH |
90 | represented at all, though it may be easy to add this. |
91 | ||
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 |
d6ae9a6d | 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 | |
275 | the function is COMDAT and shared in between units. | |
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 | ||
eefe9a99 JH |
302 | /* One Definition Rule hashtable helpers. */ |
303 | ||
304 | struct odr_hasher | |
305 | { | |
306 | typedef odr_type_d value_type; | |
307 | typedef union tree_node compare_type; | |
308 | static inline hashval_t hash (const value_type *); | |
309 | static inline bool equal (const value_type *, const compare_type *); | |
310 | static inline void remove (value_type *); | |
311 | }; | |
312 | ||
549bcbd1 JH |
313 | /* Return type that was declared with T's name so that T is an |
314 | qualified variant of it. */ | |
315 | ||
316 | static inline tree | |
317 | main_odr_variant (const_tree t) | |
318 | { | |
319 | if (TYPE_NAME (t) && TREE_CODE (TYPE_NAME (t)) == TYPE_DECL) | |
320 | return TREE_TYPE (TYPE_NAME (t)); | |
321 | /* Unnamed types and non-C++ produced types can be compared by variants. */ | |
322 | else | |
323 | return TYPE_MAIN_VARIANT (t); | |
324 | } | |
325 | ||
eefe9a99 JH |
326 | /* Produce hash based on type name. */ |
327 | ||
549bcbd1 | 328 | static hashval_t |
eefe9a99 JH |
329 | hash_type_name (tree t) |
330 | { | |
549bcbd1 | 331 | gcc_checking_assert (main_odr_variant (t) == t); |
eefe9a99 JH |
332 | |
333 | /* If not in LTO, all main variants are unique, so we can do | |
334 | pointer hash. */ | |
335 | if (!in_lto_p) | |
336 | return htab_hash_pointer (t); | |
337 | ||
338 | /* Anonymous types are unique. */ | |
339 | if (type_in_anonymous_namespace_p (t)) | |
340 | return htab_hash_pointer (t); | |
341 | ||
1ee85ee1 JH |
342 | /* ODR types have name specified. */ |
343 | if (TYPE_NAME (t) | |
344 | && DECL_ASSEMBLER_NAME_SET_P (TYPE_NAME (t))) | |
345 | return IDENTIFIER_HASH_VALUE (DECL_ASSEMBLER_NAME (TYPE_NAME (t))); | |
346 | ||
347 | /* For polymorphic types that was compiled with -fno-lto-odr-type-merging | |
348 | we can simply hash the virtual table. */ | |
549bcbd1 JH |
349 | if (TREE_CODE (t) == RECORD_TYPE |
350 | && TYPE_BINFO (t) && BINFO_VTABLE (TYPE_BINFO (t))) | |
61a74079 JH |
351 | { |
352 | tree v = BINFO_VTABLE (TYPE_BINFO (t)); | |
353 | hashval_t hash = 0; | |
354 | ||
355 | if (TREE_CODE (v) == POINTER_PLUS_EXPR) | |
356 | { | |
357 | hash = TREE_INT_CST_LOW (TREE_OPERAND (v, 1)); | |
358 | v = TREE_OPERAND (TREE_OPERAND (v, 0), 0); | |
359 | } | |
360 | ||
361 | v = DECL_ASSEMBLER_NAME (v); | |
61a74079 JH |
362 | hash = iterative_hash_hashval_t (hash, htab_hash_pointer (v)); |
363 | return hash; | |
364 | } | |
365 | ||
1ee85ee1 JH |
366 | /* Builtin types may appear as main variants of ODR types and are unique. |
367 | Sanity check we do not get anything that looks non-builtin. */ | |
368 | gcc_checking_assert (TREE_CODE (t) == INTEGER_TYPE | |
369 | || TREE_CODE (t) == VOID_TYPE | |
370 | || TREE_CODE (t) == COMPLEX_TYPE | |
371 | || TREE_CODE (t) == REAL_TYPE | |
372 | || TREE_CODE (t) == POINTER_TYPE); | |
373 | return htab_hash_pointer (t); | |
eefe9a99 JH |
374 | } |
375 | ||
376 | /* Return the computed hashcode for ODR_TYPE. */ | |
377 | ||
378 | inline hashval_t | |
379 | odr_hasher::hash (const value_type *odr_type) | |
380 | { | |
381 | return hash_type_name (odr_type->type); | |
382 | } | |
383 | ||
549bcbd1 JH |
384 | /* For languages with One Definition Rule, work out if |
385 | types are the same based on their name. | |
386 | ||
d6ae9a6d | 387 | This is non-trivial for LTO where minor differences in |
549bcbd1 JH |
388 | the type representation may have prevented type merging |
389 | to merge two copies of otherwise equivalent type. | |
390 | ||
391 | Until we start streaming mangled type names, this function works | |
392 | only for polymorphic types. */ | |
393 | ||
394 | bool | |
395 | types_same_for_odr (const_tree type1, const_tree type2) | |
396 | { | |
397 | gcc_checking_assert (TYPE_P (type1) && TYPE_P (type2)); | |
398 | ||
399 | type1 = main_odr_variant (type1); | |
400 | type2 = main_odr_variant (type2); | |
401 | ||
402 | if (type1 == type2) | |
403 | return true; | |
404 | ||
405 | if (!in_lto_p) | |
406 | return false; | |
407 | ||
408 | /* Check for anonymous namespaces. Those have !TREE_PUBLIC | |
409 | on the corresponding TYPE_STUB_DECL. */ | |
410 | if (type_in_anonymous_namespace_p (type1) | |
411 | || type_in_anonymous_namespace_p (type2)) | |
412 | return false; | |
413 | ||
01a92e70 | 414 | |
1ee85ee1 JH |
415 | /* ODR name of the type is set in DECL_ASSEMBLER_NAME of its TYPE_NAME. |
416 | ||
d6ae9a6d | 417 | Ideally we should never need types without ODR names here. It can however |
1ee85ee1 | 418 | happen in two cases: |
549bcbd1 | 419 | |
1ee85ee1 JH |
420 | 1) for builtin types that are not streamed but rebuilt in lto/lto-lang.c |
421 | Here testing for equivalence is safe, since their MAIN_VARIANTs are | |
422 | unique. | |
423 | 2) for units streamed with -fno-lto-odr-type-merging. Here we can't | |
424 | establish precise ODR equivalency, but for correctness we care only | |
425 | about equivalency on complete polymorphic types. For these we can | |
426 | compare assembler names of their virtual tables. */ | |
427 | if ((!TYPE_NAME (type1) || !DECL_ASSEMBLER_NAME_SET_P (TYPE_NAME (type1))) | |
428 | || (!TYPE_NAME (type2) || !DECL_ASSEMBLER_NAME_SET_P (TYPE_NAME (type2)))) | |
549bcbd1 | 429 | { |
d6ae9a6d SL |
430 | /* See if types are obviously different (i.e. different codes |
431 | or polymorphic wrt non-polymorphic). This is not strictly correct | |
1ee85ee1 JH |
432 | for ODR violating programs, but we can't do better without streaming |
433 | ODR names. */ | |
434 | if (TREE_CODE (type1) != TREE_CODE (type2)) | |
435 | return false; | |
436 | if (TREE_CODE (type1) == RECORD_TYPE | |
437 | && (TYPE_BINFO (type1) == NULL_TREE) != (TYPE_BINFO (type1) == NULL_TREE)) | |
438 | return false; | |
439 | if (TREE_CODE (type1) == RECORD_TYPE && TYPE_BINFO (type1) | |
440 | && (BINFO_VTABLE (TYPE_BINFO (type1)) == NULL_TREE) | |
441 | != (BINFO_VTABLE (TYPE_BINFO (type2)) == NULL_TREE)) | |
442 | return false; | |
443 | ||
d6ae9a6d SL |
444 | /* At the moment we have no way to establish ODR equivalence at LTO |
445 | other than comparing virtual table pointers of polymorphic types. | |
1ee85ee1 JH |
446 | Eventually we should start saving mangled names in TYPE_NAME. |
447 | Then this condition will become non-trivial. */ | |
448 | ||
449 | if (TREE_CODE (type1) == RECORD_TYPE | |
450 | && TYPE_BINFO (type1) && TYPE_BINFO (type2) | |
451 | && BINFO_VTABLE (TYPE_BINFO (type1)) | |
452 | && BINFO_VTABLE (TYPE_BINFO (type2))) | |
453 | { | |
454 | tree v1 = BINFO_VTABLE (TYPE_BINFO (type1)); | |
455 | tree v2 = BINFO_VTABLE (TYPE_BINFO (type2)); | |
456 | gcc_assert (TREE_CODE (v1) == POINTER_PLUS_EXPR | |
457 | && TREE_CODE (v2) == POINTER_PLUS_EXPR); | |
458 | return (operand_equal_p (TREE_OPERAND (v1, 1), | |
459 | TREE_OPERAND (v2, 1), 0) | |
460 | && DECL_ASSEMBLER_NAME | |
461 | (TREE_OPERAND (TREE_OPERAND (v1, 0), 0)) | |
462 | == DECL_ASSEMBLER_NAME | |
463 | (TREE_OPERAND (TREE_OPERAND (v2, 0), 0))); | |
464 | } | |
465 | gcc_unreachable (); | |
549bcbd1 | 466 | } |
1ee85ee1 JH |
467 | return (DECL_ASSEMBLER_NAME (TYPE_NAME (type1)) |
468 | == DECL_ASSEMBLER_NAME (TYPE_NAME (type2))); | |
549bcbd1 JH |
469 | } |
470 | ||
a1981458 JH |
471 | /* Return true if we can decide on ODR equivalency. |
472 | ||
473 | In non-LTO it is always decide, in LTO however it depends in the type has | |
474 | ODR info attached. */ | |
475 | ||
aa803cc7 | 476 | bool |
a1981458 JH |
477 | types_odr_comparable (tree t1, tree t2) |
478 | { | |
479 | return (!in_lto_p | |
480 | || main_odr_variant (t1) == main_odr_variant (t2) | |
481 | || (odr_type_p (t1) && odr_type_p (t2)) | |
482 | || (TREE_CODE (t1) == RECORD_TYPE && TREE_CODE (t2) == RECORD_TYPE | |
483 | && TYPE_BINFO (t1) && TYPE_BINFO (t2) | |
484 | && polymorphic_type_binfo_p (TYPE_BINFO (t1)) | |
485 | && polymorphic_type_binfo_p (TYPE_BINFO (t2)))); | |
486 | } | |
487 | ||
488 | /* Return true if T1 and T2 are ODR equivalent. If ODR equivalency is not | |
489 | known, be conservative and return false. */ | |
490 | ||
aa803cc7 | 491 | bool |
a1981458 JH |
492 | types_must_be_same_for_odr (tree t1, tree t2) |
493 | { | |
494 | if (types_odr_comparable (t1, t2)) | |
495 | return types_same_for_odr (t1, t2); | |
496 | else | |
497 | return main_odr_variant (t1) == main_odr_variant (t2); | |
498 | } | |
549bcbd1 | 499 | |
0e1474e5 | 500 | /* Compare types T1 and T2 and return true if they are |
eefe9a99 JH |
501 | equivalent. */ |
502 | ||
503 | inline bool | |
504 | odr_hasher::equal (const value_type *t1, const compare_type *ct2) | |
505 | { | |
506 | tree t2 = const_cast <tree> (ct2); | |
507 | ||
549bcbd1 | 508 | gcc_checking_assert (main_odr_variant (t2) == t2); |
eefe9a99 JH |
509 | if (t1->type == t2) |
510 | return true; | |
511 | if (!in_lto_p) | |
512 | return false; | |
513 | return types_same_for_odr (t1->type, t2); | |
514 | } | |
515 | ||
0e1474e5 | 516 | /* Free ODR type V. */ |
eefe9a99 JH |
517 | |
518 | inline void | |
519 | odr_hasher::remove (value_type *v) | |
520 | { | |
521 | v->bases.release (); | |
522 | v->derived_types.release (); | |
61a74079 | 523 | if (v->types_set) |
6e2830c3 | 524 | delete v->types_set; |
eefe9a99 JH |
525 | ggc_free (v); |
526 | } | |
527 | ||
d6ae9a6d | 528 | /* ODR type hash used to look up ODR type based on tree type node. */ |
eefe9a99 | 529 | |
c203e8a7 TS |
530 | typedef hash_table<odr_hasher> odr_hash_type; |
531 | static odr_hash_type *odr_hash; | |
eefe9a99 JH |
532 | |
533 | /* ODR types are also stored into ODR_TYPE vector to allow consistent | |
534 | walking. Bases appear before derived types. Vector is garbage collected | |
535 | so we won't end up visiting empty types. */ | |
536 | ||
537 | static GTY(()) vec <odr_type, va_gc> *odr_types_ptr; | |
538 | #define odr_types (*odr_types_ptr) | |
539 | ||
c7e1befa JH |
540 | /* Set TYPE_BINFO of TYPE and its variants to BINFO. */ |
541 | void | |
542 | set_type_binfo (tree type, tree binfo) | |
543 | { | |
544 | for (; type; type = TYPE_NEXT_VARIANT (type)) | |
545 | if (COMPLETE_TYPE_P (type)) | |
546 | TYPE_BINFO (type) = binfo; | |
547 | else | |
548 | gcc_assert (!TYPE_BINFO (type)); | |
549 | } | |
550 | ||
c59f7203 JH |
551 | /* Compare T2 and T2 based on name or structure. */ |
552 | ||
553 | static bool | |
2c132d34 | 554 | odr_subtypes_equivalent_p (tree t1, tree t2, hash_set<type_pair,pair_traits> *visited) |
c59f7203 JH |
555 | { |
556 | bool an1, an2; | |
557 | ||
558 | /* This can happen in incomplete types that should be handled earlier. */ | |
559 | gcc_assert (t1 && t2); | |
560 | ||
561 | t1 = main_odr_variant (t1); | |
562 | t2 = main_odr_variant (t2); | |
563 | if (t1 == t2) | |
564 | return true; | |
c59f7203 JH |
565 | |
566 | /* Anonymous namespace types must match exactly. */ | |
567 | an1 = type_in_anonymous_namespace_p (t1); | |
568 | an2 = type_in_anonymous_namespace_p (t2); | |
569 | if (an1 != an2 || an1) | |
570 | return false; | |
571 | ||
9d8fc086 JH |
572 | /* For ODR types be sure to compare their names. |
573 | To support -wno-odr-type-merging we allow one type to be non-ODR | |
574 | and other ODR even though it is a violation. */ | |
a1981458 | 575 | if (types_odr_comparable (t1, t2)) |
c59f7203 | 576 | { |
2c132d34 JH |
577 | if (!types_same_for_odr (t1, t2)) |
578 | return false; | |
579 | /* Limit recursion: If subtypes are ODR types and we know | |
580 | that they are same, be happy. */ | |
581 | if (!get_odr_type (t1, true)->odr_violated) | |
582 | return true; | |
c59f7203 | 583 | } |
1ee85ee1 | 584 | |
d6ae9a6d | 585 | /* Component types, builtins and possibly violating ODR types |
2c132d34 JH |
586 | have to be compared structurally. */ |
587 | if (TREE_CODE (t1) != TREE_CODE (t2)) | |
588 | return false; | |
589 | if ((TYPE_NAME (t1) == NULL_TREE) != (TYPE_NAME (t2) == NULL_TREE)) | |
590 | return false; | |
591 | if (TYPE_NAME (t1) && DECL_NAME (TYPE_NAME (t1)) != DECL_NAME (TYPE_NAME (t2))) | |
592 | return false; | |
593 | ||
594 | type_pair pair={t1,t2}; | |
595 | if (TYPE_UID (t1) > TYPE_UID (t2)) | |
596 | { | |
597 | pair.first = t2; | |
598 | pair.second = t1; | |
599 | } | |
600 | if (visited->add (pair)) | |
601 | return true; | |
602 | return odr_types_equivalent_p (t1, t2, false, NULL, visited); | |
c59f7203 JH |
603 | } |
604 | ||
56b1f114 | 605 | /* Compare two virtual tables, PREVAILING and VTABLE and output ODR |
d6ae9a6d | 606 | violation warnings. */ |
56b1f114 JH |
607 | |
608 | void | |
609 | compare_virtual_tables (varpool_node *prevailing, varpool_node *vtable) | |
610 | { | |
611 | int n1, n2; | |
612 | if (DECL_VIRTUAL_P (prevailing->decl) != DECL_VIRTUAL_P (vtable->decl)) | |
613 | { | |
614 | odr_violation_reported = true; | |
615 | if (DECL_VIRTUAL_P (prevailing->decl)) | |
616 | { | |
617 | varpool_node *tmp = prevailing; | |
618 | prevailing = vtable; | |
619 | vtable = tmp; | |
620 | } | |
621 | if (warning_at (DECL_SOURCE_LOCATION (TYPE_NAME (DECL_CONTEXT (vtable->decl))), | |
622 | OPT_Wodr, | |
623 | "virtual table of type %qD violates one definition rule", | |
624 | DECL_CONTEXT (vtable->decl))) | |
625 | inform (DECL_SOURCE_LOCATION (prevailing->decl), | |
626 | "variable of same assembler name as the virtual table is " | |
627 | "defined in another translation unit"); | |
628 | return; | |
629 | } | |
630 | if (!prevailing->definition || !vtable->definition) | |
631 | return; | |
632 | for (n1 = 0, n2 = 0; true; n1++, n2++) | |
633 | { | |
634 | struct ipa_ref *ref1, *ref2; | |
635 | bool end1, end2; | |
636 | end1 = !prevailing->iterate_reference (n1, ref1); | |
637 | end2 = !vtable->iterate_reference (n2, ref2); | |
638 | if (end1 && end2) | |
639 | return; | |
640 | if (!end1 && !end2 | |
641 | && DECL_ASSEMBLER_NAME (ref1->referred->decl) | |
642 | != DECL_ASSEMBLER_NAME (ref2->referred->decl) | |
643 | && !n2 | |
644 | && !DECL_VIRTUAL_P (ref2->referred->decl) | |
645 | && DECL_VIRTUAL_P (ref1->referred->decl)) | |
646 | { | |
647 | if (warning_at (DECL_SOURCE_LOCATION (TYPE_NAME (DECL_CONTEXT (vtable->decl))), 0, | |
648 | "virtual table of type %qD contains RTTI information", | |
649 | DECL_CONTEXT (vtable->decl))) | |
650 | { | |
651 | inform (DECL_SOURCE_LOCATION (TYPE_NAME (DECL_CONTEXT (prevailing->decl))), | |
652 | "but is prevailed by one without from other translation unit"); | |
653 | inform (DECL_SOURCE_LOCATION (TYPE_NAME (DECL_CONTEXT (prevailing->decl))), | |
654 | "RTTI will not work on this type"); | |
655 | } | |
656 | n2++; | |
657 | end2 = !vtable->iterate_reference (n2, ref2); | |
658 | } | |
659 | if (!end1 && !end2 | |
660 | && DECL_ASSEMBLER_NAME (ref1->referred->decl) | |
661 | != DECL_ASSEMBLER_NAME (ref2->referred->decl) | |
662 | && !n1 | |
663 | && !DECL_VIRTUAL_P (ref1->referred->decl) | |
664 | && DECL_VIRTUAL_P (ref2->referred->decl)) | |
665 | { | |
666 | n1++; | |
667 | end1 = !vtable->iterate_reference (n1, ref1); | |
668 | } | |
669 | if (end1 || end2) | |
670 | { | |
671 | if (end1) | |
672 | { | |
673 | varpool_node *tmp = prevailing; | |
674 | prevailing = vtable; | |
675 | vtable = tmp; | |
676 | ref1 = ref2; | |
677 | } | |
678 | if (warning_at (DECL_SOURCE_LOCATION | |
679 | (TYPE_NAME (DECL_CONTEXT (vtable->decl))), 0, | |
680 | "virtual table of type %qD violates " | |
681 | "one definition rule", | |
682 | DECL_CONTEXT (vtable->decl))) | |
683 | { | |
684 | inform (DECL_SOURCE_LOCATION | |
685 | (TYPE_NAME (DECL_CONTEXT (prevailing->decl))), | |
686 | "the conflicting type defined in another translation " | |
687 | "unit"); | |
688 | inform (DECL_SOURCE_LOCATION | |
689 | (TYPE_NAME (DECL_CONTEXT (ref1->referring->decl))), | |
690 | "contains additional virtual method %qD", | |
691 | ref1->referred->decl); | |
692 | } | |
693 | return; | |
694 | } | |
695 | if (DECL_ASSEMBLER_NAME (ref1->referred->decl) | |
696 | != DECL_ASSEMBLER_NAME (ref2->referred->decl)) | |
697 | { | |
698 | if (warning_at (DECL_SOURCE_LOCATION | |
699 | (TYPE_NAME (DECL_CONTEXT (vtable->decl))), 0, | |
700 | "virtual table of type %qD violates " | |
701 | "one definition rule ", | |
702 | DECL_CONTEXT (vtable->decl))) | |
703 | { | |
704 | inform (DECL_SOURCE_LOCATION | |
705 | (TYPE_NAME (DECL_CONTEXT (prevailing->decl))), | |
706 | "the conflicting type defined in another translation " | |
707 | "unit"); | |
708 | inform (DECL_SOURCE_LOCATION (ref1->referred->decl), | |
709 | "virtual method %qD", ref1->referred->decl); | |
710 | inform (DECL_SOURCE_LOCATION (ref2->referred->decl), | |
711 | "ought to match virtual method %qD but does not", | |
712 | ref2->referred->decl); | |
713 | return; | |
714 | } | |
715 | } | |
716 | } | |
717 | } | |
718 | ||
c59f7203 JH |
719 | /* Output ODR violation warning about T1 and T2 with REASON. |
720 | Display location of ST1 and ST2 if REASON speaks about field or | |
721 | method of the type. | |
722 | If WARN is false, do nothing. Set WARNED if warning was indeed | |
723 | output. */ | |
724 | ||
725 | void | |
726 | warn_odr (tree t1, tree t2, tree st1, tree st2, | |
727 | bool warn, bool *warned, const char *reason) | |
728 | { | |
729 | tree decl2 = TYPE_NAME (t2); | |
730 | ||
731 | if (!warn) | |
732 | return; | |
733 | if (!warning_at (DECL_SOURCE_LOCATION (TYPE_NAME (t1)), OPT_Wodr, | |
734 | "type %qT violates one definition rule", | |
735 | t1)) | |
736 | return; | |
2c132d34 | 737 | if (!st1 && !st2) |
c59f7203 | 738 | ; |
2c132d34 JH |
739 | /* For FIELD_DECL support also case where one of fields is |
740 | NULL - this is used when the structures have mismatching number of | |
741 | elements. */ | |
742 | else if (!st1 || TREE_CODE (st1) == FIELD_DECL) | |
c59f7203 JH |
743 | { |
744 | inform (DECL_SOURCE_LOCATION (decl2), | |
745 | "a different type is defined in another translation unit"); | |
2c132d34 JH |
746 | if (!st1) |
747 | { | |
748 | st1 = st2; | |
749 | st2 = NULL; | |
750 | } | |
c59f7203 JH |
751 | inform (DECL_SOURCE_LOCATION (st1), |
752 | "the first difference of corresponding definitions is field %qD", | |
753 | st1); | |
2c132d34 JH |
754 | if (st2) |
755 | decl2 = st2; | |
c59f7203 JH |
756 | } |
757 | else if (TREE_CODE (st1) == FUNCTION_DECL) | |
758 | { | |
759 | inform (DECL_SOURCE_LOCATION (decl2), | |
760 | "a different type is defined in another translation unit"); | |
761 | inform (DECL_SOURCE_LOCATION (st1), | |
762 | "the first difference of corresponding definitions is method %qD", | |
763 | st1); | |
764 | decl2 = st2; | |
765 | } | |
766 | else | |
767 | return; | |
768 | inform (DECL_SOURCE_LOCATION (decl2), reason); | |
769 | ||
770 | if (warned) | |
771 | *warned = true; | |
772 | } | |
773 | ||
774 | /* We already warned about ODR mismatch. T1 and T2 ought to be equivalent | |
775 | because they are used on same place in ODR matching types. | |
776 | They are not; inform the user. */ | |
777 | ||
778 | void | |
779 | warn_types_mismatch (tree t1, tree t2) | |
780 | { | |
781 | if (!TYPE_NAME (t1) || !TYPE_NAME (t2)) | |
782 | return; | |
783 | /* In Firefox it is a common bug to have same types but in | |
784 | different namespaces. Be a bit more informative on | |
785 | this. */ | |
786 | if (TYPE_CONTEXT (t1) && TYPE_CONTEXT (t2) | |
787 | && (((TREE_CODE (TYPE_CONTEXT (t1)) == NAMESPACE_DECL) | |
788 | != (TREE_CODE (TYPE_CONTEXT (t2)) == NAMESPACE_DECL)) | |
789 | || (TREE_CODE (TYPE_CONTEXT (t1)) == NAMESPACE_DECL | |
790 | && (DECL_NAME (TYPE_CONTEXT (t1)) != | |
791 | DECL_NAME (TYPE_CONTEXT (t2)))))) | |
792 | inform (DECL_SOURCE_LOCATION (TYPE_NAME (t1)), | |
793 | "type %qT should match type %qT but is defined " | |
794 | "in different namespace ", | |
795 | t1, t2); | |
796 | else | |
797 | inform (DECL_SOURCE_LOCATION (TYPE_NAME (t1)), | |
798 | "type %qT should match type %qT", | |
799 | t1, t2); | |
800 | inform (DECL_SOURCE_LOCATION (TYPE_NAME (t2)), | |
801 | "the incompatible type is defined here"); | |
802 | } | |
803 | ||
804 | /* Compare T1 and T2, report ODR violations if WARN is true and set | |
805 | WARNED to true if anything is reported. Return true if types match. | |
806 | If true is returned, the types are also compatible in the sense of | |
807 | gimple_canonical_types_compatible_p. */ | |
808 | ||
809 | static bool | |
2c132d34 | 810 | odr_types_equivalent_p (tree t1, tree t2, bool warn, bool *warned, hash_set<type_pair,pair_traits> *visited) |
c59f7203 JH |
811 | { |
812 | /* Check first for the obvious case of pointer identity. */ | |
813 | if (t1 == t2) | |
814 | return true; | |
815 | gcc_assert (!type_in_anonymous_namespace_p (t1)); | |
816 | gcc_assert (!type_in_anonymous_namespace_p (t2)); | |
817 | ||
818 | /* Can't be the same type if the types don't have the same code. */ | |
819 | if (TREE_CODE (t1) != TREE_CODE (t2)) | |
820 | { | |
821 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
822 | G_("a different type is defined in another translation unit")); | |
823 | return false; | |
824 | } | |
825 | ||
826 | if (TYPE_QUALS (t1) != TYPE_QUALS (t2)) | |
827 | { | |
828 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
829 | G_("a type with different qualifiers is defined in another " | |
830 | "translation unit")); | |
831 | return false; | |
832 | } | |
833 | ||
834 | if (comp_type_attributes (t1, t2) != 1) | |
835 | { | |
836 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
837 | G_("a type with attributes " | |
838 | "is defined in another translation unit")); | |
839 | return false; | |
840 | } | |
841 | ||
842 | if (TREE_CODE (t1) == ENUMERAL_TYPE) | |
843 | { | |
844 | tree v1, v2; | |
845 | for (v1 = TYPE_VALUES (t1), v2 = TYPE_VALUES (t2); | |
846 | v1 && v2 ; v1 = TREE_CHAIN (v1), v2 = TREE_CHAIN (v2)) | |
847 | { | |
848 | if (TREE_PURPOSE (v1) != TREE_PURPOSE (v2)) | |
849 | { | |
850 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
851 | G_("an enum with different value name" | |
852 | " is defined in another translation unit")); | |
853 | return false; | |
854 | } | |
855 | if (TREE_VALUE (v1) != TREE_VALUE (v2) | |
856 | && !operand_equal_p (DECL_INITIAL (TREE_VALUE (v1)), | |
857 | DECL_INITIAL (TREE_VALUE (v2)), 0)) | |
858 | { | |
859 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
860 | G_("an enum with different values is defined" | |
861 | " in another translation unit")); | |
862 | return false; | |
863 | } | |
864 | } | |
865 | if (v1 || v2) | |
866 | { | |
867 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
868 | G_("an enum with mismatching number of values " | |
869 | "is defined in another translation unit")); | |
870 | return false; | |
871 | } | |
872 | } | |
873 | ||
874 | /* Non-aggregate types can be handled cheaply. */ | |
875 | if (INTEGRAL_TYPE_P (t1) | |
876 | || SCALAR_FLOAT_TYPE_P (t1) | |
877 | || FIXED_POINT_TYPE_P (t1) | |
878 | || TREE_CODE (t1) == VECTOR_TYPE | |
879 | || TREE_CODE (t1) == COMPLEX_TYPE | |
880 | || TREE_CODE (t1) == OFFSET_TYPE | |
881 | || POINTER_TYPE_P (t1)) | |
882 | { | |
883 | if (TYPE_PRECISION (t1) != TYPE_PRECISION (t2)) | |
884 | { | |
885 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
886 | G_("a type with different precision is defined " | |
887 | "in another translation unit")); | |
888 | return false; | |
889 | } | |
890 | if (TYPE_UNSIGNED (t1) != TYPE_UNSIGNED (t2)) | |
891 | { | |
892 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
893 | G_("a type with different signedness is defined " | |
894 | "in another translation unit")); | |
895 | return false; | |
896 | } | |
897 | ||
898 | if (TREE_CODE (t1) == INTEGER_TYPE | |
899 | && TYPE_STRING_FLAG (t1) != TYPE_STRING_FLAG (t2)) | |
900 | { | |
901 | /* char WRT uint_8? */ | |
902 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
903 | G_("a different type is defined in another " | |
904 | "translation unit")); | |
905 | return false; | |
906 | } | |
907 | ||
908 | /* For canonical type comparisons we do not want to build SCCs | |
909 | so we cannot compare pointed-to types. But we can, for now, | |
910 | require the same pointed-to type kind and match what | |
911 | useless_type_conversion_p would do. */ | |
912 | if (POINTER_TYPE_P (t1)) | |
913 | { | |
914 | if (TYPE_ADDR_SPACE (TREE_TYPE (t1)) | |
915 | != TYPE_ADDR_SPACE (TREE_TYPE (t2))) | |
916 | { | |
917 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
918 | G_("it is defined as a pointer in different address " | |
919 | "space in another translation unit")); | |
920 | return false; | |
921 | } | |
922 | ||
923 | if (!odr_subtypes_equivalent_p (TREE_TYPE (t1), TREE_TYPE (t2), visited)) | |
924 | { | |
925 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
926 | G_("it is defined as a pointer to different type " | |
927 | "in another translation unit")); | |
928 | if (warn && warned) | |
929 | warn_types_mismatch (TREE_TYPE (t1), TREE_TYPE (t2)); | |
930 | return false; | |
931 | } | |
932 | } | |
933 | ||
c59f7203 JH |
934 | if ((TREE_CODE (t1) == VECTOR_TYPE || TREE_CODE (t1) == COMPLEX_TYPE) |
935 | && !odr_subtypes_equivalent_p (TREE_TYPE (t1), TREE_TYPE (t2), visited)) | |
936 | { | |
937 | /* Probably specific enough. */ | |
938 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
939 | G_("a different type is defined " | |
940 | "in another translation unit")); | |
941 | if (warn && warned) | |
942 | warn_types_mismatch (TREE_TYPE (t1), TREE_TYPE (t2)); | |
943 | return false; | |
944 | } | |
c59f7203 | 945 | } |
c59f7203 | 946 | /* Do type-specific comparisons. */ |
2c132d34 | 947 | else switch (TREE_CODE (t1)) |
c59f7203 JH |
948 | { |
949 | case ARRAY_TYPE: | |
950 | { | |
951 | /* Array types are the same if the element types are the same and | |
952 | the number of elements are the same. */ | |
953 | if (!odr_subtypes_equivalent_p (TREE_TYPE (t1), TREE_TYPE (t2), visited)) | |
954 | { | |
955 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
956 | G_("a different type is defined in another " | |
957 | "translation unit")); | |
958 | if (warn && warned) | |
959 | warn_types_mismatch (TREE_TYPE (t1), TREE_TYPE (t2)); | |
960 | } | |
961 | gcc_assert (TYPE_STRING_FLAG (t1) == TYPE_STRING_FLAG (t2)); | |
962 | gcc_assert (TYPE_NONALIASED_COMPONENT (t1) | |
963 | == TYPE_NONALIASED_COMPONENT (t2)); | |
964 | ||
965 | tree i1 = TYPE_DOMAIN (t1); | |
966 | tree i2 = TYPE_DOMAIN (t2); | |
967 | ||
968 | /* For an incomplete external array, the type domain can be | |
969 | NULL_TREE. Check this condition also. */ | |
970 | if (i1 == NULL_TREE || i2 == NULL_TREE) | |
971 | return true; | |
972 | ||
973 | tree min1 = TYPE_MIN_VALUE (i1); | |
974 | tree min2 = TYPE_MIN_VALUE (i2); | |
975 | tree max1 = TYPE_MAX_VALUE (i1); | |
976 | tree max2 = TYPE_MAX_VALUE (i2); | |
977 | ||
978 | /* In C++, minimums should be always 0. */ | |
979 | gcc_assert (min1 == min2); | |
980 | if (!operand_equal_p (max1, max2, 0)) | |
981 | { | |
982 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
983 | G_("an array of different size is defined " | |
984 | "in another translation unit")); | |
985 | return false; | |
986 | } | |
c59f7203 | 987 | } |
2c132d34 | 988 | break; |
c59f7203 JH |
989 | |
990 | case METHOD_TYPE: | |
991 | case FUNCTION_TYPE: | |
992 | /* Function types are the same if the return type and arguments types | |
993 | are the same. */ | |
994 | if (!odr_subtypes_equivalent_p (TREE_TYPE (t1), TREE_TYPE (t2), visited)) | |
995 | { | |
996 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
997 | G_("has different return value " | |
998 | "in another translation unit")); | |
999 | if (warn && warned) | |
1000 | warn_types_mismatch (TREE_TYPE (t1), TREE_TYPE (t2)); | |
1001 | return false; | |
1002 | } | |
1003 | ||
1004 | if (TYPE_ARG_TYPES (t1) == TYPE_ARG_TYPES (t2)) | |
1005 | return true; | |
1006 | else | |
1007 | { | |
1008 | tree parms1, parms2; | |
1009 | ||
1010 | for (parms1 = TYPE_ARG_TYPES (t1), parms2 = TYPE_ARG_TYPES (t2); | |
1011 | parms1 && parms2; | |
1012 | parms1 = TREE_CHAIN (parms1), parms2 = TREE_CHAIN (parms2)) | |
1013 | { | |
1014 | if (!odr_subtypes_equivalent_p | |
1015 | (TREE_VALUE (parms1), TREE_VALUE (parms2), visited)) | |
1016 | { | |
1017 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1018 | G_("has different parameters in another " | |
1019 | "translation unit")); | |
1020 | if (warn && warned) | |
1021 | warn_types_mismatch (TREE_VALUE (parms1), | |
1022 | TREE_VALUE (parms2)); | |
1023 | return false; | |
1024 | } | |
1025 | } | |
1026 | ||
1027 | if (parms1 || parms2) | |
1028 | { | |
1029 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1030 | G_("has different parameters " | |
1031 | "in another translation unit")); | |
1032 | return false; | |
1033 | } | |
1034 | ||
1035 | return true; | |
1036 | } | |
1037 | ||
1038 | case RECORD_TYPE: | |
1039 | case UNION_TYPE: | |
1040 | case QUAL_UNION_TYPE: | |
1041 | { | |
1042 | tree f1, f2; | |
1043 | ||
1044 | /* For aggregate types, all the fields must be the same. */ | |
1045 | if (COMPLETE_TYPE_P (t1) && COMPLETE_TYPE_P (t2)) | |
1046 | { | |
1047 | for (f1 = TYPE_FIELDS (t1), f2 = TYPE_FIELDS (t2); | |
1048 | f1 || f2; | |
1049 | f1 = TREE_CHAIN (f1), f2 = TREE_CHAIN (f2)) | |
1050 | { | |
1051 | /* Skip non-fields. */ | |
1052 | while (f1 && TREE_CODE (f1) != FIELD_DECL) | |
1053 | f1 = TREE_CHAIN (f1); | |
1054 | while (f2 && TREE_CODE (f2) != FIELD_DECL) | |
1055 | f2 = TREE_CHAIN (f2); | |
1056 | if (!f1 || !f2) | |
1057 | break; | |
1058 | if (DECL_ARTIFICIAL (f1) != DECL_ARTIFICIAL (f2)) | |
1059 | break; | |
1060 | if (DECL_NAME (f1) != DECL_NAME (f2) | |
1061 | && !DECL_ARTIFICIAL (f1)) | |
1062 | { | |
1063 | warn_odr (t1, t2, f1, f2, warn, warned, | |
1064 | G_("a field with different name is defined " | |
1065 | "in another translation unit")); | |
1066 | return false; | |
1067 | } | |
1068 | if (!odr_subtypes_equivalent_p (TREE_TYPE (f1), TREE_TYPE (f2), visited)) | |
1069 | { | |
1070 | /* Do not warn about artificial fields and just go into generic | |
1071 | field mismatch warning. */ | |
1072 | if (DECL_ARTIFICIAL (f1)) | |
1073 | break; | |
1074 | ||
1075 | warn_odr (t1, t2, f1, f2, warn, warned, | |
1076 | G_("a field of same name but different type " | |
1077 | "is defined in another translation unit")); | |
1078 | if (warn && warned) | |
1079 | warn_types_mismatch (TREE_TYPE (f1), TREE_TYPE (f2)); | |
1080 | return false; | |
1081 | } | |
1082 | if (!gimple_compare_field_offset (f1, f2)) | |
1083 | { | |
1084 | /* Do not warn about artificial fields and just go into generic | |
1085 | field mismatch warning. */ | |
1086 | if (DECL_ARTIFICIAL (f1)) | |
1087 | break; | |
1088 | warn_odr (t1, t2, t1, t2, warn, warned, | |
1089 | G_("fields has different layout " | |
1090 | "in another translation unit")); | |
1091 | return false; | |
1092 | } | |
1093 | gcc_assert (DECL_NONADDRESSABLE_P (f1) | |
1094 | == DECL_NONADDRESSABLE_P (f2)); | |
1095 | } | |
1096 | ||
1097 | /* If one aggregate has more fields than the other, they | |
1098 | are not the same. */ | |
1099 | if (f1 || f2) | |
1100 | { | |
2c132d34 JH |
1101 | if (f1 && DECL_ARTIFICIAL (f1)) |
1102 | f1 = NULL; | |
1103 | if (f2 && DECL_ARTIFICIAL (f2)) | |
1104 | f2 = NULL; | |
1105 | if (f1 || f2) | |
1106 | warn_odr (t1, t2, f1, f2, warn, warned, | |
1107 | G_("a type with different number of fields " | |
1108 | "is defined in another translation unit")); | |
1109 | /* Ideally we should never get this generic message. */ | |
1110 | else | |
1111 | warn_odr (t1, t2, f1, f2, warn, warned, | |
1112 | G_("a type with different memory representation " | |
1113 | "is defined in another translation unit")); | |
1114 | ||
c59f7203 JH |
1115 | return false; |
1116 | } | |
1117 | if ((TYPE_MAIN_VARIANT (t1) == t1 || TYPE_MAIN_VARIANT (t2) == t2) | |
1118 | && (TYPE_METHODS (TYPE_MAIN_VARIANT (t1)) | |
1119 | != TYPE_METHODS (TYPE_MAIN_VARIANT (t2)))) | |
1120 | { | |
1121 | for (f1 = TYPE_METHODS (TYPE_MAIN_VARIANT (t1)), | |
1122 | f2 = TYPE_METHODS (TYPE_MAIN_VARIANT (t2)); | |
1123 | f1 && f2 ; f1 = DECL_CHAIN (f1), f2 = DECL_CHAIN (f2)) | |
1124 | { | |
1125 | if (DECL_ASSEMBLER_NAME (f1) != DECL_ASSEMBLER_NAME (f2)) | |
1126 | { | |
1127 | warn_odr (t1, t2, f1, f2, warn, warned, | |
1128 | G_("a different method of same type " | |
1129 | "is defined in another translation unit")); | |
1130 | return false; | |
1131 | } | |
1132 | if (DECL_VIRTUAL_P (f1) != DECL_VIRTUAL_P (f2)) | |
1133 | { | |
1134 | warn_odr (t1, t2, f1, f2, warn, warned, | |
1135 | G_("s definition that differs by virtual " | |
1136 | "keyword in another translation unit")); | |
1137 | return false; | |
1138 | } | |
1139 | if (DECL_VINDEX (f1) != DECL_VINDEX (f2)) | |
1140 | { | |
1141 | warn_odr (t1, t2, f1, f2, warn, warned, | |
1142 | G_("virtual table layout differs in another " | |
1143 | "translation unit")); | |
1144 | return false; | |
1145 | } | |
1146 | if (odr_subtypes_equivalent_p (TREE_TYPE (f1), TREE_TYPE (f2), visited)) | |
1147 | { | |
1148 | warn_odr (t1, t2, f1, f2, warn, warned, | |
1149 | G_("method with incompatible type is defined " | |
1150 | "in another translation unit")); | |
1151 | return false; | |
1152 | } | |
1153 | } | |
1154 | if (f1 || f2) | |
1155 | { | |
1156 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1157 | G_("a type with different number of methods " | |
1158 | "is defined in another translation unit")); | |
1159 | return false; | |
1160 | } | |
1161 | } | |
c59f7203 | 1162 | } |
2c132d34 | 1163 | break; |
c59f7203 | 1164 | } |
2c132d34 JH |
1165 | case VOID_TYPE: |
1166 | break; | |
c59f7203 JH |
1167 | |
1168 | default: | |
2c132d34 | 1169 | debug_tree (t1); |
c59f7203 JH |
1170 | gcc_unreachable (); |
1171 | } | |
2c132d34 JH |
1172 | |
1173 | /* Those are better to come last as they are utterly uninformative. */ | |
1174 | if (TYPE_SIZE (t1) && TYPE_SIZE (t2) | |
1175 | && !operand_equal_p (TYPE_SIZE (t1), TYPE_SIZE (t2), 0)) | |
1176 | { | |
1177 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1178 | G_("a type with different size " | |
1179 | "is defined in another translation unit")); | |
1180 | return false; | |
1181 | } | |
1182 | if (COMPLETE_TYPE_P (t1) && COMPLETE_TYPE_P (t2) | |
1183 | && TYPE_ALIGN (t1) != TYPE_ALIGN (t2)) | |
1184 | { | |
1185 | warn_odr (t1, t2, NULL, NULL, warn, warned, | |
1186 | G_("a type with different alignment " | |
1187 | "is defined in another translation unit")); | |
1188 | return false; | |
1189 | } | |
1190 | gcc_assert (!TYPE_SIZE_UNIT (t1) || !TYPE_SIZE_UNIT (t2) | |
1191 | || operand_equal_p (TYPE_SIZE_UNIT (t1), | |
1192 | TYPE_SIZE_UNIT (t2), 0)); | |
1193 | return true; | |
c59f7203 JH |
1194 | } |
1195 | ||
61a74079 JH |
1196 | /* TYPE is equivalent to VAL by ODR, but its tree representation differs |
1197 | from VAL->type. This may happen in LTO where tree merging did not merge | |
1198 | all variants of the same type. It may or may not mean the ODR violation. | |
1199 | Add it to the list of duplicates and warn on some violations. */ | |
1200 | ||
549bcbd1 | 1201 | static bool |
61a74079 JH |
1202 | add_type_duplicate (odr_type val, tree type) |
1203 | { | |
549bcbd1 | 1204 | bool build_bases = false; |
61a74079 | 1205 | if (!val->types_set) |
6e2830c3 | 1206 | val->types_set = new hash_set<tree>; |
61a74079 | 1207 | |
549bcbd1 JH |
1208 | /* Always prefer complete type to be the leader. */ |
1209 | if (!COMPLETE_TYPE_P (val->type) | |
1210 | && COMPLETE_TYPE_P (type)) | |
1211 | { | |
1212 | tree tmp = type; | |
1213 | ||
1214 | build_bases = true; | |
1215 | type = val->type; | |
1216 | val->type = tmp; | |
1217 | } | |
1218 | ||
61a74079 | 1219 | /* See if this duplicate is new. */ |
6e2830c3 | 1220 | if (!val->types_set->add (type)) |
61a74079 JH |
1221 | { |
1222 | bool merge = true; | |
1223 | bool base_mismatch = false; | |
549bcbd1 | 1224 | unsigned int i,j; |
c59f7203 | 1225 | bool warned = false; |
2c132d34 | 1226 | hash_set<type_pair,pair_traits> visited; |
549bcbd1 | 1227 | |
61a74079 JH |
1228 | gcc_assert (in_lto_p); |
1229 | vec_safe_push (val->types, type); | |
61a74079 JH |
1230 | |
1231 | /* First we compare memory layout. */ | |
c59f7203 | 1232 | if (!odr_types_equivalent_p (val->type, type, !flag_ltrans && !val->odr_violated, |
6e2830c3 | 1233 | &warned, &visited)) |
61a74079 JH |
1234 | { |
1235 | merge = false; | |
ec77d61f | 1236 | odr_violation_reported = true; |
549bcbd1 | 1237 | val->odr_violated = true; |
3dafb85c | 1238 | if (symtab->dump_file) |
61a74079 | 1239 | { |
3dafb85c | 1240 | fprintf (symtab->dump_file, "ODR violation\n"); |
61a74079 | 1241 | |
3dafb85c ML |
1242 | print_node (symtab->dump_file, "", val->type, 0); |
1243 | putc ('\n',symtab->dump_file); | |
1244 | print_node (symtab->dump_file, "", type, 0); | |
1245 | putc ('\n',symtab->dump_file); | |
61a74079 JH |
1246 | } |
1247 | } | |
1248 | ||
1249 | /* Next sanity check that bases are the same. If not, we will end | |
1250 | up producing wrong answers. */ | |
549bcbd1 JH |
1251 | if (COMPLETE_TYPE_P (type) && COMPLETE_TYPE_P (val->type) |
1252 | && TREE_CODE (val->type) == RECORD_TYPE | |
1253 | && TREE_CODE (type) == RECORD_TYPE | |
1254 | && TYPE_BINFO (val->type) && TYPE_BINFO (type)) | |
61a74079 | 1255 | { |
549bcbd1 JH |
1256 | for (j = 0, i = 0; i < BINFO_N_BASE_BINFOS (TYPE_BINFO (type)); i++) |
1257 | if (polymorphic_type_binfo_p (BINFO_BASE_BINFO (TYPE_BINFO (type), i))) | |
1258 | { | |
1259 | odr_type base = get_odr_type | |
1260 | (BINFO_TYPE | |
1261 | (BINFO_BASE_BINFO (TYPE_BINFO (type), | |
1262 | i)), | |
1263 | true); | |
1264 | if (val->bases.length () <= j || val->bases[j] != base) | |
1265 | base_mismatch = true; | |
1266 | j++; | |
1267 | } | |
1268 | if (base_mismatch) | |
61a74079 | 1269 | { |
549bcbd1 JH |
1270 | merge = false; |
1271 | odr_violation_reported = true; | |
1272 | ||
c59f7203 JH |
1273 | if (!warned && !val->odr_violated) |
1274 | warn_odr (type, val->type, NULL, NULL, !warned, &warned, | |
1275 | "a type with the same name but different bases is " | |
1276 | "defined in another translation unit"); | |
549bcbd1 | 1277 | val->odr_violated = true; |
3dafb85c | 1278 | if (symtab->dump_file) |
549bcbd1 | 1279 | { |
3dafb85c | 1280 | fprintf (symtab->dump_file, "ODR bse violation or merging bug?\n"); |
549bcbd1 | 1281 | |
3dafb85c ML |
1282 | print_node (symtab->dump_file, "", val->type, 0); |
1283 | putc ('\n',symtab->dump_file); | |
1284 | print_node (symtab->dump_file, "", type, 0); | |
1285 | putc ('\n',symtab->dump_file); | |
549bcbd1 | 1286 | } |
61a74079 JH |
1287 | } |
1288 | } | |
1289 | ||
1290 | /* Regularize things a little. During LTO same types may come with | |
1291 | different BINFOs. Either because their virtual table was | |
1292 | not merged by tree merging and only later at decl merging or | |
1293 | because one type comes with external vtable, while other | |
1294 | with internal. We want to merge equivalent binfos to conserve | |
1295 | memory and streaming overhead. | |
1296 | ||
1297 | The external vtables are more harmful: they contain references | |
1298 | to external declarations of methods that may be defined in the | |
1299 | merged LTO unit. For this reason we absolutely need to remove | |
1300 | them and replace by internal variants. Not doing so will lead | |
1ee85ee1 JH |
1301 | to incomplete answers from possible_polymorphic_call_targets. |
1302 | ||
1303 | FIXME: disable for now; because ODR types are now build during | |
1304 | streaming in, the variants do not need to be linked to the type, | |
1305 | yet. We need to do the merging in cleanup pass to be implemented | |
1306 | soon. */ | |
549bcbd1 | 1307 | if (!flag_ltrans && merge |
1ee85ee1 | 1308 | && 0 |
549bcbd1 JH |
1309 | && TREE_CODE (val->type) == RECORD_TYPE |
1310 | && TREE_CODE (type) == RECORD_TYPE | |
1311 | && TYPE_BINFO (val->type) && TYPE_BINFO (type) | |
1312 | && TYPE_MAIN_VARIANT (type) == type | |
1313 | && TYPE_MAIN_VARIANT (val->type) == val->type | |
1314 | && BINFO_VTABLE (TYPE_BINFO (val->type)) | |
1315 | && BINFO_VTABLE (TYPE_BINFO (type))) | |
61a74079 JH |
1316 | { |
1317 | tree master_binfo = TYPE_BINFO (val->type); | |
1318 | tree v1 = BINFO_VTABLE (master_binfo); | |
1319 | tree v2 = BINFO_VTABLE (TYPE_BINFO (type)); | |
1320 | ||
1321 | if (TREE_CODE (v1) == POINTER_PLUS_EXPR) | |
1322 | { | |
1323 | gcc_assert (TREE_CODE (v2) == POINTER_PLUS_EXPR | |
1324 | && operand_equal_p (TREE_OPERAND (v1, 1), | |
1325 | TREE_OPERAND (v2, 1), 0)); | |
1326 | v1 = TREE_OPERAND (TREE_OPERAND (v1, 0), 0); | |
1327 | v2 = TREE_OPERAND (TREE_OPERAND (v2, 0), 0); | |
1328 | } | |
1329 | gcc_assert (DECL_ASSEMBLER_NAME (v1) | |
1330 | == DECL_ASSEMBLER_NAME (v2)); | |
1331 | ||
1332 | if (DECL_EXTERNAL (v1) && !DECL_EXTERNAL (v2)) | |
1333 | { | |
1334 | unsigned int i; | |
1335 | ||
c7e1befa | 1336 | set_type_binfo (val->type, TYPE_BINFO (type)); |
c3284718 | 1337 | for (i = 0; i < val->types->length (); i++) |
61a74079 JH |
1338 | { |
1339 | if (TYPE_BINFO ((*val->types)[i]) | |
1340 | == master_binfo) | |
c7e1befa | 1341 | set_type_binfo ((*val->types)[i], TYPE_BINFO (type)); |
61a74079 | 1342 | } |
c7e1befa | 1343 | BINFO_TYPE (TYPE_BINFO (type)) = val->type; |
61a74079 JH |
1344 | } |
1345 | else | |
c7e1befa | 1346 | set_type_binfo (type, master_binfo); |
61a74079 JH |
1347 | } |
1348 | } | |
549bcbd1 | 1349 | return build_bases; |
61a74079 JH |
1350 | } |
1351 | ||
eefe9a99 JH |
1352 | /* Get ODR type hash entry for TYPE. If INSERT is true, create |
1353 | possibly new entry. */ | |
1354 | ||
1355 | odr_type | |
1356 | get_odr_type (tree type, bool insert) | |
1357 | { | |
1358 | odr_type_d **slot; | |
1359 | odr_type val; | |
1360 | hashval_t hash; | |
549bcbd1 JH |
1361 | bool build_bases = false; |
1362 | bool insert_to_odr_array = false; | |
1363 | int base_id = -1; | |
1364 | ||
1365 | type = main_odr_variant (type); | |
eefe9a99 | 1366 | |
eefe9a99 | 1367 | hash = hash_type_name (type); |
a1981458 JH |
1368 | slot = odr_hash->find_slot_with_hash (type, hash, |
1369 | insert ? INSERT : NO_INSERT); | |
eefe9a99 JH |
1370 | if (!slot) |
1371 | return NULL; | |
1372 | ||
1373 | /* See if we already have entry for type. */ | |
1374 | if (*slot) | |
1375 | { | |
1376 | val = *slot; | |
1377 | ||
61a74079 JH |
1378 | /* With LTO we need to support multiple tree representation of |
1379 | the same ODR type. */ | |
1380 | if (val->type != type) | |
549bcbd1 | 1381 | build_bases = add_type_duplicate (val, type); |
eefe9a99 JH |
1382 | } |
1383 | else | |
1384 | { | |
766090c2 | 1385 | val = ggc_cleared_alloc<odr_type_d> (); |
eefe9a99 JH |
1386 | val->type = type; |
1387 | val->bases = vNULL; | |
1388 | val->derived_types = vNULL; | |
0e1474e5 | 1389 | val->anonymous_namespace = type_in_anonymous_namespace_p (type); |
549bcbd1 JH |
1390 | build_bases = COMPLETE_TYPE_P (val->type); |
1391 | insert_to_odr_array = true; | |
1392 | } | |
1393 | ||
1394 | if (build_bases && TREE_CODE (type) == RECORD_TYPE && TYPE_BINFO (type) | |
1395 | && type == TYPE_MAIN_VARIANT (type)) | |
1396 | { | |
1397 | tree binfo = TYPE_BINFO (type); | |
1398 | unsigned int i; | |
1399 | ||
1400 | gcc_assert (BINFO_TYPE (TYPE_BINFO (val->type)) = type); | |
1401 | ||
2d1644bf | 1402 | val->all_derivations_known = type_all_derivations_known_p (type); |
eefe9a99 JH |
1403 | *slot = val; |
1404 | for (i = 0; i < BINFO_N_BASE_BINFOS (binfo); i++) | |
1405 | /* For now record only polymorphic types. other are | |
1406 | pointless for devirtualization and we can not precisely | |
1407 | determine ODR equivalency of these during LTO. */ | |
1408 | if (polymorphic_type_binfo_p (BINFO_BASE_BINFO (binfo, i))) | |
1409 | { | |
1410 | odr_type base = get_odr_type (BINFO_TYPE (BINFO_BASE_BINFO (binfo, | |
1411 | i)), | |
1412 | true); | |
549bcbd1 | 1413 | gcc_assert (TYPE_MAIN_VARIANT (base->type) == base->type); |
eefe9a99 JH |
1414 | base->derived_types.safe_push (val); |
1415 | val->bases.safe_push (base); | |
549bcbd1 JH |
1416 | if (base->id > base_id) |
1417 | base_id = base->id; | |
eefe9a99 | 1418 | } |
549bcbd1 JH |
1419 | } |
1420 | /* Ensure that type always appears after bases. */ | |
1421 | if (insert_to_odr_array) | |
1422 | { | |
eefe9a99 | 1423 | if (odr_types_ptr) |
c3284718 | 1424 | val->id = odr_types.length (); |
eefe9a99 JH |
1425 | vec_safe_push (odr_types_ptr, val); |
1426 | } | |
549bcbd1 JH |
1427 | else if (base_id > val->id) |
1428 | { | |
1429 | odr_types[val->id] = 0; | |
1430 | /* Be sure we did not recorded any derived types; these may need | |
1431 | renumbering too. */ | |
1432 | gcc_assert (val->derived_types.length() == 0); | |
1433 | if (odr_types_ptr) | |
1434 | val->id = odr_types.length (); | |
1435 | vec_safe_push (odr_types_ptr, val); | |
1436 | } | |
eefe9a99 JH |
1437 | return val; |
1438 | } | |
1439 | ||
1ee85ee1 JH |
1440 | /* Add TYPE od ODR type hash. */ |
1441 | ||
1442 | void | |
1443 | register_odr_type (tree type) | |
1444 | { | |
1445 | if (!odr_hash) | |
1446 | odr_hash = new odr_hash_type (23); | |
1447 | /* Arrange things to be nicer and insert main variants first. */ | |
1448 | if (odr_type_p (TYPE_MAIN_VARIANT (type))) | |
1449 | get_odr_type (TYPE_MAIN_VARIANT (type), true); | |
1450 | if (TYPE_MAIN_VARIANT (type) != type) | |
1451 | get_odr_type (type, true); | |
1452 | } | |
1453 | ||
aa803cc7 JH |
1454 | /* Return true if type is known to have no derivations. */ |
1455 | ||
1456 | bool | |
1457 | type_known_to_have_no_deriavations_p (tree t) | |
1458 | { | |
1459 | return (type_all_derivations_known_p (t) | |
1460 | && (TYPE_FINAL_P (t) | |
1461 | || (odr_hash | |
1462 | && !get_odr_type (t, true)->derived_types.length()))); | |
1463 | } | |
1464 | ||
d6ae9a6d SL |
1465 | /* Dump ODR type T and all its derived types. INDENT specifies indentation for |
1466 | recursive printing. */ | |
eefe9a99 JH |
1467 | |
1468 | static void | |
1469 | dump_odr_type (FILE *f, odr_type t, int indent=0) | |
1470 | { | |
1471 | unsigned int i; | |
1472 | fprintf (f, "%*s type %i: ", indent * 2, "", t->id); | |
1473 | print_generic_expr (f, t->type, TDF_SLIM); | |
2d1644bf JH |
1474 | fprintf (f, "%s", t->anonymous_namespace ? " (anonymous namespace)":""); |
1475 | fprintf (f, "%s\n", t->all_derivations_known ? " (derivations known)":""); | |
eefe9a99 JH |
1476 | if (TYPE_NAME (t->type)) |
1477 | { | |
1478 | fprintf (f, "%*s defined at: %s:%i\n", indent * 2, "", | |
1479 | DECL_SOURCE_FILE (TYPE_NAME (t->type)), | |
1480 | DECL_SOURCE_LINE (TYPE_NAME (t->type))); | |
1481 | } | |
c3284718 | 1482 | if (t->bases.length ()) |
eefe9a99 JH |
1483 | { |
1484 | fprintf (f, "%*s base odr type ids: ", indent * 2, ""); | |
c3284718 | 1485 | for (i = 0; i < t->bases.length (); i++) |
eefe9a99 JH |
1486 | fprintf (f, " %i", t->bases[i]->id); |
1487 | fprintf (f, "\n"); | |
1488 | } | |
c3284718 | 1489 | if (t->derived_types.length ()) |
eefe9a99 JH |
1490 | { |
1491 | fprintf (f, "%*s derived types:\n", indent * 2, ""); | |
c3284718 | 1492 | for (i = 0; i < t->derived_types.length (); i++) |
eefe9a99 JH |
1493 | dump_odr_type (f, t->derived_types[i], indent + 1); |
1494 | } | |
1495 | fprintf (f, "\n"); | |
1496 | } | |
1497 | ||
1498 | /* Dump the type inheritance graph. */ | |
1499 | ||
1500 | static void | |
1501 | dump_type_inheritance_graph (FILE *f) | |
1502 | { | |
1503 | unsigned int i; | |
0e1474e5 JH |
1504 | if (!odr_types_ptr) |
1505 | return; | |
eefe9a99 | 1506 | fprintf (f, "\n\nType inheritance graph:\n"); |
c3284718 | 1507 | for (i = 0; i < odr_types.length (); i++) |
eefe9a99 | 1508 | { |
549bcbd1 | 1509 | if (odr_types[i] && odr_types[i]->bases.length () == 0) |
eefe9a99 JH |
1510 | dump_odr_type (f, odr_types[i]); |
1511 | } | |
c3284718 | 1512 | for (i = 0; i < odr_types.length (); i++) |
61a74079 | 1513 | { |
549bcbd1 | 1514 | if (odr_types[i] && odr_types[i]->types && odr_types[i]->types->length ()) |
61a74079 JH |
1515 | { |
1516 | unsigned int j; | |
1517 | fprintf (f, "Duplicate tree types for odr type %i\n", i); | |
1518 | print_node (f, "", odr_types[i]->type, 0); | |
c3284718 | 1519 | for (j = 0; j < odr_types[i]->types->length (); j++) |
61a74079 JH |
1520 | { |
1521 | tree t; | |
1522 | fprintf (f, "duplicate #%i\n", j); | |
1523 | print_node (f, "", (*odr_types[i]->types)[j], 0); | |
1524 | t = (*odr_types[i]->types)[j]; | |
1525 | while (TYPE_P (t) && TYPE_CONTEXT (t)) | |
1526 | { | |
1527 | t = TYPE_CONTEXT (t); | |
1528 | print_node (f, "", t, 0); | |
1529 | } | |
1530 | putc ('\n',f); | |
1531 | } | |
1532 | } | |
1533 | } | |
eefe9a99 JH |
1534 | } |
1535 | ||
1536 | /* Given method type T, return type of class it belongs to. | |
d6ae9a6d | 1537 | Look up this pointer and get its type. */ |
eefe9a99 | 1538 | |
64cbf23d | 1539 | tree |
d570d364 | 1540 | method_class_type (const_tree t) |
eefe9a99 JH |
1541 | { |
1542 | tree first_parm_type = TREE_VALUE (TYPE_ARG_TYPES (t)); | |
68377e53 | 1543 | gcc_assert (TREE_CODE (t) == METHOD_TYPE); |
eefe9a99 JH |
1544 | |
1545 | return TREE_TYPE (first_parm_type); | |
1546 | } | |
1547 | ||
1548 | /* Initialize IPA devirt and build inheritance tree graph. */ | |
1549 | ||
1550 | void | |
1551 | build_type_inheritance_graph (void) | |
1552 | { | |
b270b096 | 1553 | struct symtab_node *n; |
eefe9a99 JH |
1554 | FILE *inheritance_dump_file; |
1555 | int flags; | |
1556 | ||
c203e8a7 | 1557 | if (odr_hash) |
eefe9a99 JH |
1558 | return; |
1559 | timevar_push (TV_IPA_INHERITANCE); | |
1560 | inheritance_dump_file = dump_begin (TDI_inheritance, &flags); | |
c203e8a7 | 1561 | odr_hash = new odr_hash_type (23); |
eefe9a99 JH |
1562 | |
1563 | /* We reconstruct the graph starting of types of all methods seen in the | |
1564 | the unit. */ | |
b270b096 | 1565 | FOR_EACH_SYMBOL (n) |
7de90a6c | 1566 | if (is_a <cgraph_node *> (n) |
b270b096 | 1567 | && DECL_VIRTUAL_P (n->decl) |
d52f5295 | 1568 | && n->real_symbol_p ()) |
549bcbd1 JH |
1569 | get_odr_type (TYPE_MAIN_VARIANT (method_class_type (TREE_TYPE (n->decl))), |
1570 | true); | |
b270b096 JH |
1571 | |
1572 | /* Look also for virtual tables of types that do not define any methods. | |
1573 | ||
1574 | We need it in a case where class B has virtual base of class A | |
1575 | re-defining its virtual method and there is class C with no virtual | |
1576 | methods with B as virtual base. | |
1577 | ||
1578 | Here we output B's virtual method in two variant - for non-virtual | |
1579 | and virtual inheritance. B's virtual table has non-virtual version, | |
1580 | while C's has virtual. | |
1581 | ||
1582 | For this reason we need to know about C in order to include both | |
1583 | variants of B. More correctly, record_target_from_binfo should | |
1584 | add both variants of the method when walking B, but we have no | |
1585 | link in between them. | |
1586 | ||
1587 | We rely on fact that either the method is exported and thus we | |
1588 | assume it is called externally or C is in anonymous namespace and | |
1589 | thus we will see the vtable. */ | |
1590 | ||
7de90a6c | 1591 | else if (is_a <varpool_node *> (n) |
b270b096 JH |
1592 | && DECL_VIRTUAL_P (n->decl) |
1593 | && TREE_CODE (DECL_CONTEXT (n->decl)) == RECORD_TYPE | |
1594 | && TYPE_BINFO (DECL_CONTEXT (n->decl)) | |
1595 | && polymorphic_type_binfo_p (TYPE_BINFO (DECL_CONTEXT (n->decl)))) | |
549bcbd1 | 1596 | get_odr_type (TYPE_MAIN_VARIANT (DECL_CONTEXT (n->decl)), true); |
eefe9a99 JH |
1597 | if (inheritance_dump_file) |
1598 | { | |
1599 | dump_type_inheritance_graph (inheritance_dump_file); | |
1600 | dump_end (TDI_inheritance, inheritance_dump_file); | |
1601 | } | |
1602 | timevar_pop (TV_IPA_INHERITANCE); | |
1603 | } | |
1604 | ||
ccb05ef2 JH |
1605 | /* Return true if N has reference from live virtual table |
1606 | (and thus can be a destination of polymorphic call). | |
1607 | Be conservatively correct when callgraph is not built or | |
1608 | if the method may be referred externally. */ | |
1609 | ||
1610 | static bool | |
1611 | referenced_from_vtable_p (struct cgraph_node *node) | |
1612 | { | |
1613 | int i; | |
1614 | struct ipa_ref *ref; | |
1615 | bool found = false; | |
1616 | ||
1617 | if (node->externally_visible | |
7d0aa05b | 1618 | || DECL_EXTERNAL (node->decl) |
ccb05ef2 JH |
1619 | || node->used_from_other_partition) |
1620 | return true; | |
1621 | ||
1622 | /* Keep this test constant time. | |
1623 | It is unlikely this can happen except for the case where speculative | |
1624 | devirtualization introduced many speculative edges to this node. | |
1625 | In this case the target is very likely alive anyway. */ | |
1626 | if (node->ref_list.referring.length () > 100) | |
1627 | return true; | |
1628 | ||
1629 | /* We need references built. */ | |
3dafb85c | 1630 | if (symtab->state <= CONSTRUCTION) |
ccb05ef2 JH |
1631 | return true; |
1632 | ||
d122681a | 1633 | for (i = 0; node->iterate_referring (i, ref); i++) |
ccb05ef2 JH |
1634 | |
1635 | if ((ref->use == IPA_REF_ALIAS | |
d52f5295 | 1636 | && referenced_from_vtable_p (dyn_cast<cgraph_node *> (ref->referring))) |
ccb05ef2 JH |
1637 | || (ref->use == IPA_REF_ADDR |
1638 | && TREE_CODE (ref->referring->decl) == VAR_DECL | |
1639 | && DECL_VIRTUAL_P (ref->referring->decl))) | |
1640 | { | |
1641 | found = true; | |
1642 | break; | |
1643 | } | |
1644 | return found; | |
1645 | } | |
1646 | ||
68377e53 | 1647 | /* If TARGET has associated node, record it in the NODES array. |
ec77d61f JH |
1648 | CAN_REFER specify if program can refer to the target directly. |
1649 | if TARGET is unknown (NULL) or it can not be inserted (for example because | |
1650 | its body was already removed and there is no way to refer to it), clear | |
1651 | COMPLETEP. */ | |
eefe9a99 JH |
1652 | |
1653 | static void | |
1654 | maybe_record_node (vec <cgraph_node *> &nodes, | |
6e2830c3 | 1655 | tree target, hash_set<tree> *inserted, |
ec77d61f | 1656 | bool can_refer, |
68377e53 | 1657 | bool *completep) |
eefe9a99 | 1658 | { |
958c1d61 JH |
1659 | struct cgraph_node *target_node, *alias_target; |
1660 | enum availability avail; | |
88f592e3 JH |
1661 | |
1662 | /* cxa_pure_virtual and __builtin_unreachable do not need to be added into | |
1663 | list of targets; the runtime effect of calling them is undefined. | |
1664 | Only "real" virtual methods should be accounted. */ | |
1665 | if (target && TREE_CODE (TREE_TYPE (target)) != METHOD_TYPE) | |
1666 | return; | |
eefe9a99 | 1667 | |
ec77d61f JH |
1668 | if (!can_refer) |
1669 | { | |
1670 | /* The only case when method of anonymous namespace becomes unreferable | |
1671 | is when we completely optimized it out. */ | |
1672 | if (flag_ltrans | |
1673 | || !target | |
88f592e3 | 1674 | || !type_in_anonymous_namespace_p (DECL_CONTEXT (target))) |
ec77d61f JH |
1675 | *completep = false; |
1676 | return; | |
1677 | } | |
1678 | ||
88f592e3 | 1679 | if (!target) |
68377e53 JH |
1680 | return; |
1681 | ||
d52f5295 | 1682 | target_node = cgraph_node::get (target); |
68377e53 | 1683 | |
d6ae9a6d | 1684 | /* Prefer alias target over aliases, so we do not get confused by |
958c1d61 JH |
1685 | fake duplicates. */ |
1686 | if (target_node) | |
1687 | { | |
d52f5295 | 1688 | alias_target = target_node->ultimate_alias_target (&avail); |
958c1d61 JH |
1689 | if (target_node != alias_target |
1690 | && avail >= AVAIL_AVAILABLE | |
d52f5295 | 1691 | && target_node->get_availability ()) |
958c1d61 JH |
1692 | target_node = alias_target; |
1693 | } | |
1694 | ||
ccb05ef2 | 1695 | /* Method can only be called by polymorphic call if any |
d6ae9a6d | 1696 | of vtables referring to it are alive. |
ccb05ef2 JH |
1697 | |
1698 | While this holds for non-anonymous functions, too, there are | |
1699 | cases where we want to keep them in the list; for example | |
1700 | inline functions with -fno-weak are static, but we still | |
1701 | may devirtualize them when instance comes from other unit. | |
1702 | The same holds for LTO. | |
1703 | ||
1704 | Currently we ignore these functions in speculative devirtualization. | |
1705 | ??? Maybe it would make sense to be more aggressive for LTO even | |
d6ae9a6d | 1706 | elsewhere. */ |
ccb05ef2 JH |
1707 | if (!flag_ltrans |
1708 | && type_in_anonymous_namespace_p (DECL_CONTEXT (target)) | |
1709 | && (!target_node | |
1710 | || !referenced_from_vtable_p (target_node))) | |
1711 | ; | |
1712 | /* See if TARGET is useful function we can deal with. */ | |
1713 | else if (target_node != NULL | |
1714 | && (TREE_PUBLIC (target) | |
1715 | || DECL_EXTERNAL (target) | |
1716 | || target_node->definition) | |
d52f5295 | 1717 | && target_node->real_symbol_p ()) |
0e1474e5 | 1718 | { |
68377e53 | 1719 | gcc_assert (!target_node->global.inlined_to); |
d52f5295 | 1720 | gcc_assert (target_node->real_symbol_p ()); |
6e2830c3 | 1721 | if (!inserted->add (target)) |
68377e53 | 1722 | { |
6e2830c3 | 1723 | cached_polymorphic_call_targets->add (target_node); |
68377e53 JH |
1724 | nodes.safe_push (target_node); |
1725 | } | |
0e1474e5 | 1726 | } |
68377e53 | 1727 | else if (completep |
2d1644bf JH |
1728 | && (!type_in_anonymous_namespace_p |
1729 | (DECL_CONTEXT (target)) | |
1730 | || flag_ltrans)) | |
0439a947 | 1731 | *completep = false; |
eefe9a99 JH |
1732 | } |
1733 | ||
d6ae9a6d | 1734 | /* See if BINFO's type matches OUTER_TYPE. If so, look up |
68377e53 | 1735 | BINFO of subtype of OTR_TYPE at OFFSET and in that BINFO find |
2d1644bf JH |
1736 | method in vtable and insert method to NODES array |
1737 | or BASES_TO_CONSIDER if this array is non-NULL. | |
eefe9a99 | 1738 | Otherwise recurse to base BINFOs. |
d6ae9a6d | 1739 | This matches what get_binfo_at_offset does, but with offset |
eefe9a99 JH |
1740 | being unknown. |
1741 | ||
a3788dde JH |
1742 | TYPE_BINFOS is a stack of BINFOS of types with defined |
1743 | virtual table seen on way from class type to BINFO. | |
eefe9a99 JH |
1744 | |
1745 | MATCHED_VTABLES tracks virtual tables we already did lookup | |
68377e53 JH |
1746 | for virtual function in. INSERTED tracks nodes we already |
1747 | inserted. | |
3462aa02 JH |
1748 | |
1749 | ANONYMOUS is true if BINFO is part of anonymous namespace. | |
ec77d61f JH |
1750 | |
1751 | Clear COMPLETEP when we hit unreferable target. | |
eefe9a99 JH |
1752 | */ |
1753 | ||
1754 | static void | |
68377e53 | 1755 | record_target_from_binfo (vec <cgraph_node *> &nodes, |
2d1644bf | 1756 | vec <tree> *bases_to_consider, |
68377e53 JH |
1757 | tree binfo, |
1758 | tree otr_type, | |
a3788dde | 1759 | vec <tree> &type_binfos, |
68377e53 JH |
1760 | HOST_WIDE_INT otr_token, |
1761 | tree outer_type, | |
1762 | HOST_WIDE_INT offset, | |
6e2830c3 TS |
1763 | hash_set<tree> *inserted, |
1764 | hash_set<tree> *matched_vtables, | |
ec77d61f JH |
1765 | bool anonymous, |
1766 | bool *completep) | |
eefe9a99 JH |
1767 | { |
1768 | tree type = BINFO_TYPE (binfo); | |
1769 | int i; | |
1770 | tree base_binfo; | |
1771 | ||
eefe9a99 | 1772 | |
a3788dde JH |
1773 | if (BINFO_VTABLE (binfo)) |
1774 | type_binfos.safe_push (binfo); | |
68377e53 | 1775 | if (types_same_for_odr (type, outer_type)) |
eefe9a99 | 1776 | { |
a3788dde JH |
1777 | int i; |
1778 | tree type_binfo = NULL; | |
1779 | ||
d6ae9a6d | 1780 | /* Look up BINFO with virtual table. For normal types it is always last |
a3788dde JH |
1781 | binfo on stack. */ |
1782 | for (i = type_binfos.length () - 1; i >= 0; i--) | |
1783 | if (BINFO_OFFSET (type_binfos[i]) == BINFO_OFFSET (binfo)) | |
1784 | { | |
1785 | type_binfo = type_binfos[i]; | |
1786 | break; | |
1787 | } | |
1788 | if (BINFO_VTABLE (binfo)) | |
1789 | type_binfos.pop (); | |
1790 | /* If this is duplicated BINFO for base shared by virtual inheritance, | |
1791 | we may not have its associated vtable. This is not a problem, since | |
1792 | we will walk it on the other path. */ | |
1793 | if (!type_binfo) | |
6d6af792 | 1794 | return; |
68377e53 JH |
1795 | tree inner_binfo = get_binfo_at_offset (type_binfo, |
1796 | offset, otr_type); | |
ec77d61f JH |
1797 | if (!inner_binfo) |
1798 | { | |
1799 | gcc_assert (odr_violation_reported); | |
1800 | return; | |
1801 | } | |
3462aa02 JH |
1802 | /* For types in anonymous namespace first check if the respective vtable |
1803 | is alive. If not, we know the type can't be called. */ | |
1804 | if (!flag_ltrans && anonymous) | |
1805 | { | |
68377e53 | 1806 | tree vtable = BINFO_VTABLE (inner_binfo); |
2c8326a5 | 1807 | varpool_node *vnode; |
3462aa02 JH |
1808 | |
1809 | if (TREE_CODE (vtable) == POINTER_PLUS_EXPR) | |
1810 | vtable = TREE_OPERAND (TREE_OPERAND (vtable, 0), 0); | |
9041d2e6 | 1811 | vnode = varpool_node::get (vtable); |
67348ccc | 1812 | if (!vnode || !vnode->definition) |
3462aa02 JH |
1813 | return; |
1814 | } | |
68377e53 | 1815 | gcc_assert (inner_binfo); |
2d1644bf | 1816 | if (bases_to_consider |
6e2830c3 TS |
1817 | ? !matched_vtables->contains (BINFO_VTABLE (inner_binfo)) |
1818 | : !matched_vtables->add (BINFO_VTABLE (inner_binfo))) | |
68377e53 | 1819 | { |
ec77d61f JH |
1820 | bool can_refer; |
1821 | tree target = gimple_get_virt_method_for_binfo (otr_token, | |
1822 | inner_binfo, | |
1823 | &can_refer); | |
2d1644bf JH |
1824 | if (!bases_to_consider) |
1825 | maybe_record_node (nodes, target, inserted, can_refer, completep); | |
1826 | /* Destructors are never called via construction vtables. */ | |
1827 | else if (!target || !DECL_CXX_DESTRUCTOR_P (target)) | |
1828 | bases_to_consider->safe_push (target); | |
68377e53 | 1829 | } |
eefe9a99 JH |
1830 | return; |
1831 | } | |
1832 | ||
1833 | /* Walk bases. */ | |
1834 | for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++) | |
d6ae9a6d | 1835 | /* Walking bases that have no virtual method is pointless exercise. */ |
eefe9a99 | 1836 | if (polymorphic_type_binfo_p (base_binfo)) |
2d1644bf | 1837 | record_target_from_binfo (nodes, bases_to_consider, base_binfo, otr_type, |
a3788dde | 1838 | type_binfos, |
68377e53 | 1839 | otr_token, outer_type, offset, inserted, |
ec77d61f | 1840 | matched_vtables, anonymous, completep); |
a3788dde JH |
1841 | if (BINFO_VTABLE (binfo)) |
1842 | type_binfos.pop (); | |
eefe9a99 JH |
1843 | } |
1844 | ||
d6ae9a6d | 1845 | /* Look up virtual methods matching OTR_TYPE (with OFFSET and OTR_TOKEN) |
eefe9a99 JH |
1846 | of TYPE, insert them to NODES, recurse into derived nodes. |
1847 | INSERTED is used to avoid duplicate insertions of methods into NODES. | |
ec77d61f | 1848 | MATCHED_VTABLES are used to avoid duplicate walking vtables. |
2d1644bf JH |
1849 | Clear COMPLETEP if unreferable target is found. |
1850 | ||
d6ae9a6d | 1851 | If CONSIDER_CONSTRUCTION is true, record to BASES_TO_CONSIDER |
2d1644bf JH |
1852 | all cases where BASE_SKIPPED is true (because the base is abstract |
1853 | class). */ | |
eefe9a99 JH |
1854 | |
1855 | static void | |
1856 | possible_polymorphic_call_targets_1 (vec <cgraph_node *> &nodes, | |
6e2830c3 TS |
1857 | hash_set<tree> *inserted, |
1858 | hash_set<tree> *matched_vtables, | |
eefe9a99 JH |
1859 | tree otr_type, |
1860 | odr_type type, | |
68377e53 JH |
1861 | HOST_WIDE_INT otr_token, |
1862 | tree outer_type, | |
ec77d61f | 1863 | HOST_WIDE_INT offset, |
2d1644bf JH |
1864 | bool *completep, |
1865 | vec <tree> &bases_to_consider, | |
1866 | bool consider_construction) | |
eefe9a99 JH |
1867 | { |
1868 | tree binfo = TYPE_BINFO (type->type); | |
1869 | unsigned int i; | |
1be0e58d | 1870 | auto_vec <tree, 8> type_binfos; |
2d1644bf JH |
1871 | bool possibly_instantiated = type_possibly_instantiated_p (type->type); |
1872 | ||
1873 | /* We may need to consider types w/o instances because of possible derived | |
1874 | types using their methods either directly or via construction vtables. | |
1875 | We are safe to skip them when all derivations are known, since we will | |
1876 | handle them later. | |
1877 | This is done by recording them to BASES_TO_CONSIDER array. */ | |
1878 | if (possibly_instantiated || consider_construction) | |
1879 | { | |
1880 | record_target_from_binfo (nodes, | |
1881 | (!possibly_instantiated | |
1882 | && type_all_derivations_known_p (type->type)) | |
1883 | ? &bases_to_consider : NULL, | |
1884 | binfo, otr_type, type_binfos, otr_token, | |
1885 | outer_type, offset, | |
1886 | inserted, matched_vtables, | |
1887 | type->anonymous_namespace, completep); | |
1888 | } | |
c3284718 | 1889 | for (i = 0; i < type->derived_types.length (); i++) |
eefe9a99 JH |
1890 | possible_polymorphic_call_targets_1 (nodes, inserted, |
1891 | matched_vtables, | |
1892 | otr_type, | |
1893 | type->derived_types[i], | |
2d1644bf JH |
1894 | otr_token, outer_type, offset, completep, |
1895 | bases_to_consider, consider_construction); | |
eefe9a99 JH |
1896 | } |
1897 | ||
1898 | /* Cache of queries for polymorphic call targets. | |
1899 | ||
1900 | Enumerating all call targets may get expensive when there are many | |
1901 | polymorphic calls in the program, so we memoize all the previous | |
1902 | queries and avoid duplicated work. */ | |
1903 | ||
1904 | struct polymorphic_call_target_d | |
1905 | { | |
eefe9a99 | 1906 | HOST_WIDE_INT otr_token; |
68377e53 JH |
1907 | ipa_polymorphic_call_context context; |
1908 | odr_type type; | |
eefe9a99 | 1909 | vec <cgraph_node *> targets; |
91bc34a9 | 1910 | tree decl_warning; |
2f28755f JH |
1911 | int type_warning; |
1912 | bool complete; | |
1913 | bool speculative; | |
eefe9a99 JH |
1914 | }; |
1915 | ||
1916 | /* Polymorphic call target cache helpers. */ | |
1917 | ||
1918 | struct polymorphic_call_target_hasher | |
1919 | { | |
1920 | typedef polymorphic_call_target_d value_type; | |
1921 | typedef polymorphic_call_target_d compare_type; | |
1922 | static inline hashval_t hash (const value_type *); | |
1923 | static inline bool equal (const value_type *, const compare_type *); | |
1924 | static inline void remove (value_type *); | |
1925 | }; | |
1926 | ||
1927 | /* Return the computed hashcode for ODR_QUERY. */ | |
1928 | ||
1929 | inline hashval_t | |
1930 | polymorphic_call_target_hasher::hash (const value_type *odr_query) | |
1931 | { | |
d313d45f AK |
1932 | inchash::hash hstate (odr_query->otr_token); |
1933 | ||
1934 | hstate.add_wide_int (odr_query->type->id); | |
1935 | hstate.merge_hash (TYPE_UID (odr_query->context.outer_type)); | |
1936 | hstate.add_wide_int (odr_query->context.offset); | |
68377e53 | 1937 | |
3339f0bc JH |
1938 | if (odr_query->context.speculative_outer_type) |
1939 | { | |
d313d45f AK |
1940 | hstate.merge_hash (TYPE_UID (odr_query->context.speculative_outer_type)); |
1941 | hstate.add_wide_int (odr_query->context.speculative_offset); | |
3339f0bc | 1942 | } |
2f28755f | 1943 | hstate.add_flag (odr_query->speculative); |
d313d45f AK |
1944 | hstate.add_flag (odr_query->context.maybe_in_construction); |
1945 | hstate.add_flag (odr_query->context.maybe_derived_type); | |
1946 | hstate.add_flag (odr_query->context.speculative_maybe_derived_type); | |
1947 | hstate.commit_flag (); | |
1948 | return hstate.end (); | |
eefe9a99 JH |
1949 | } |
1950 | ||
1951 | /* Compare cache entries T1 and T2. */ | |
1952 | ||
1953 | inline bool | |
1954 | polymorphic_call_target_hasher::equal (const value_type *t1, | |
1955 | const compare_type *t2) | |
1956 | { | |
68377e53 | 1957 | return (t1->type == t2->type && t1->otr_token == t2->otr_token |
2f28755f | 1958 | && t1->speculative == t2->speculative |
68377e53 | 1959 | && t1->context.offset == t2->context.offset |
3339f0bc | 1960 | && t1->context.speculative_offset == t2->context.speculative_offset |
68377e53 | 1961 | && t1->context.outer_type == t2->context.outer_type |
3339f0bc | 1962 | && t1->context.speculative_outer_type == t2->context.speculative_outer_type |
68377e53 JH |
1963 | && t1->context.maybe_in_construction |
1964 | == t2->context.maybe_in_construction | |
3339f0bc JH |
1965 | && t1->context.maybe_derived_type == t2->context.maybe_derived_type |
1966 | && (t1->context.speculative_maybe_derived_type | |
1967 | == t2->context.speculative_maybe_derived_type)); | |
eefe9a99 JH |
1968 | } |
1969 | ||
1970 | /* Remove entry in polymorphic call target cache hash. */ | |
1971 | ||
1972 | inline void | |
1973 | polymorphic_call_target_hasher::remove (value_type *v) | |
1974 | { | |
1975 | v->targets.release (); | |
1976 | free (v); | |
1977 | } | |
1978 | ||
1979 | /* Polymorphic call target query cache. */ | |
1980 | ||
c203e8a7 | 1981 | typedef hash_table<polymorphic_call_target_hasher> |
eefe9a99 | 1982 | polymorphic_call_target_hash_type; |
c203e8a7 | 1983 | static polymorphic_call_target_hash_type *polymorphic_call_target_hash; |
eefe9a99 JH |
1984 | |
1985 | /* Destroy polymorphic call target query cache. */ | |
1986 | ||
1987 | static void | |
1988 | free_polymorphic_call_targets_hash () | |
1989 | { | |
0e1474e5 JH |
1990 | if (cached_polymorphic_call_targets) |
1991 | { | |
c203e8a7 TS |
1992 | delete polymorphic_call_target_hash; |
1993 | polymorphic_call_target_hash = NULL; | |
6e2830c3 | 1994 | delete cached_polymorphic_call_targets; |
0e1474e5 JH |
1995 | cached_polymorphic_call_targets = NULL; |
1996 | } | |
eefe9a99 JH |
1997 | } |
1998 | ||
1999 | /* When virtual function is removed, we may need to flush the cache. */ | |
2000 | ||
2001 | static void | |
2002 | devirt_node_removal_hook (struct cgraph_node *n, void *d ATTRIBUTE_UNUSED) | |
2003 | { | |
0e1474e5 | 2004 | if (cached_polymorphic_call_targets |
6e2830c3 | 2005 | && cached_polymorphic_call_targets->contains (n)) |
eefe9a99 JH |
2006 | free_polymorphic_call_targets_hash (); |
2007 | } | |
2008 | ||
d6ae9a6d | 2009 | /* Look up base of BINFO that has virtual table VTABLE with OFFSET. */ |
390675c8 | 2010 | |
aa803cc7 | 2011 | tree |
85942f45 JH |
2012 | subbinfo_with_vtable_at_offset (tree binfo, unsigned HOST_WIDE_INT offset, |
2013 | tree vtable) | |
390675c8 JH |
2014 | { |
2015 | tree v = BINFO_VTABLE (binfo); | |
2016 | int i; | |
2017 | tree base_binfo; | |
85942f45 | 2018 | unsigned HOST_WIDE_INT this_offset; |
390675c8 | 2019 | |
85942f45 JH |
2020 | if (v) |
2021 | { | |
2022 | if (!vtable_pointer_value_to_vtable (v, &v, &this_offset)) | |
2023 | gcc_unreachable (); | |
2024 | ||
2025 | if (offset == this_offset | |
2026 | && DECL_ASSEMBLER_NAME (v) == DECL_ASSEMBLER_NAME (vtable)) | |
2027 | return binfo; | |
2028 | } | |
390675c8 | 2029 | |
390675c8 JH |
2030 | for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++) |
2031 | if (polymorphic_type_binfo_p (base_binfo)) | |
2032 | { | |
2033 | base_binfo = subbinfo_with_vtable_at_offset (base_binfo, offset, vtable); | |
2034 | if (base_binfo) | |
2035 | return base_binfo; | |
2036 | } | |
2037 | return NULL; | |
2038 | } | |
2039 | ||
85942f45 JH |
2040 | /* T is known constant value of virtual table pointer. |
2041 | Store virtual table to V and its offset to OFFSET. | |
2042 | Return false if T does not look like virtual table reference. */ | |
390675c8 | 2043 | |
85942f45 | 2044 | bool |
d570d364 JH |
2045 | vtable_pointer_value_to_vtable (const_tree t, tree *v, |
2046 | unsigned HOST_WIDE_INT *offset) | |
390675c8 JH |
2047 | { |
2048 | /* We expect &MEM[(void *)&virtual_table + 16B]. | |
2049 | We obtain object's BINFO from the context of the virtual table. | |
2050 | This one contains pointer to virtual table represented via | |
d6ae9a6d | 2051 | POINTER_PLUS_EXPR. Verify that this pointer matches what |
390675c8 JH |
2052 | we propagated through. |
2053 | ||
2054 | In the case of virtual inheritance, the virtual tables may | |
2055 | be nested, i.e. the offset may be different from 16 and we may | |
2056 | need to dive into the type representation. */ | |
85942f45 | 2057 | if (TREE_CODE (t) == ADDR_EXPR |
390675c8 JH |
2058 | && TREE_CODE (TREE_OPERAND (t, 0)) == MEM_REF |
2059 | && TREE_CODE (TREE_OPERAND (TREE_OPERAND (t, 0), 0)) == ADDR_EXPR | |
2060 | && TREE_CODE (TREE_OPERAND (TREE_OPERAND (t, 0), 1)) == INTEGER_CST | |
2061 | && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (t, 0), 0), 0)) | |
2062 | == VAR_DECL) | |
2063 | && DECL_VIRTUAL_P (TREE_OPERAND (TREE_OPERAND | |
2064 | (TREE_OPERAND (t, 0), 0), 0))) | |
2065 | { | |
85942f45 JH |
2066 | *v = TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (t, 0), 0), 0); |
2067 | *offset = tree_to_uhwi (TREE_OPERAND (TREE_OPERAND (t, 0), 1)); | |
2068 | return true; | |
390675c8 | 2069 | } |
85942f45 JH |
2070 | |
2071 | /* Alternative representation, used by C++ frontend is POINTER_PLUS_EXPR. | |
2072 | We need to handle it when T comes from static variable initializer or | |
2073 | BINFO. */ | |
2074 | if (TREE_CODE (t) == POINTER_PLUS_EXPR) | |
2075 | { | |
2076 | *offset = tree_to_uhwi (TREE_OPERAND (t, 1)); | |
2077 | t = TREE_OPERAND (t, 0); | |
2078 | } | |
2079 | else | |
2080 | *offset = 0; | |
2081 | ||
2082 | if (TREE_CODE (t) != ADDR_EXPR) | |
2083 | return false; | |
2084 | *v = TREE_OPERAND (t, 0); | |
2085 | return true; | |
2086 | } | |
2087 | ||
2088 | /* T is known constant value of virtual table pointer. Return BINFO of the | |
2089 | instance type. */ | |
2090 | ||
2091 | tree | |
d570d364 | 2092 | vtable_pointer_value_to_binfo (const_tree t) |
85942f45 JH |
2093 | { |
2094 | tree vtable; | |
2095 | unsigned HOST_WIDE_INT offset; | |
2096 | ||
2097 | if (!vtable_pointer_value_to_vtable (t, &vtable, &offset)) | |
2098 | return NULL_TREE; | |
2099 | ||
2100 | /* FIXME: for stores of construction vtables we return NULL, | |
2101 | because we do not have BINFO for those. Eventually we should fix | |
2102 | our representation to allow this case to be handled, too. | |
2103 | In the case we see store of BINFO we however may assume | |
d6ae9a6d | 2104 | that standard folding will be able to cope with it. */ |
85942f45 JH |
2105 | return subbinfo_with_vtable_at_offset (TYPE_BINFO (DECL_CONTEXT (vtable)), |
2106 | offset, vtable); | |
390675c8 JH |
2107 | } |
2108 | ||
68377e53 | 2109 | /* Walk bases of OUTER_TYPE that contain OTR_TYPE at OFFSET. |
d6ae9a6d SL |
2110 | Look up their respective virtual methods for OTR_TOKEN and OTR_TYPE |
2111 | and insert them in NODES. | |
68377e53 JH |
2112 | |
2113 | MATCHED_VTABLES and INSERTED is used to avoid duplicated work. */ | |
2114 | ||
2115 | static void | |
2116 | record_targets_from_bases (tree otr_type, | |
2117 | HOST_WIDE_INT otr_token, | |
2118 | tree outer_type, | |
2119 | HOST_WIDE_INT offset, | |
ec77d61f | 2120 | vec <cgraph_node *> &nodes, |
6e2830c3 TS |
2121 | hash_set<tree> *inserted, |
2122 | hash_set<tree> *matched_vtables, | |
68377e53 JH |
2123 | bool *completep) |
2124 | { | |
2125 | while (true) | |
2126 | { | |
2127 | HOST_WIDE_INT pos, size; | |
2128 | tree base_binfo; | |
2129 | tree fld; | |
2130 | ||
2131 | if (types_same_for_odr (outer_type, otr_type)) | |
2132 | return; | |
2133 | ||
2134 | for (fld = TYPE_FIELDS (outer_type); fld; fld = DECL_CHAIN (fld)) | |
2135 | { | |
2136 | if (TREE_CODE (fld) != FIELD_DECL) | |
2137 | continue; | |
2138 | ||
2139 | pos = int_bit_position (fld); | |
2140 | size = tree_to_shwi (DECL_SIZE (fld)); | |
ec77d61f JH |
2141 | if (pos <= offset && (pos + size) > offset |
2142 | /* Do not get confused by zero sized bases. */ | |
2143 | && polymorphic_type_binfo_p (TYPE_BINFO (TREE_TYPE (fld)))) | |
68377e53 JH |
2144 | break; |
2145 | } | |
d6ae9a6d | 2146 | /* Within a class type we should always find corresponding fields. */ |
68377e53 JH |
2147 | gcc_assert (fld && TREE_CODE (TREE_TYPE (fld)) == RECORD_TYPE); |
2148 | ||
d6ae9a6d | 2149 | /* Nonbase types should have been stripped by outer_class_type. */ |
68377e53 JH |
2150 | gcc_assert (DECL_ARTIFICIAL (fld)); |
2151 | ||
2152 | outer_type = TREE_TYPE (fld); | |
2153 | offset -= pos; | |
2154 | ||
2155 | base_binfo = get_binfo_at_offset (TYPE_BINFO (outer_type), | |
2156 | offset, otr_type); | |
ec77d61f JH |
2157 | if (!base_binfo) |
2158 | { | |
2159 | gcc_assert (odr_violation_reported); | |
2160 | return; | |
2161 | } | |
68377e53 | 2162 | gcc_assert (base_binfo); |
6e2830c3 | 2163 | if (!matched_vtables->add (BINFO_VTABLE (base_binfo))) |
68377e53 | 2164 | { |
ec77d61f JH |
2165 | bool can_refer; |
2166 | tree target = gimple_get_virt_method_for_binfo (otr_token, | |
2167 | base_binfo, | |
2168 | &can_refer); | |
2d1644bf JH |
2169 | if (!target || ! DECL_CXX_DESTRUCTOR_P (target)) |
2170 | maybe_record_node (nodes, target, inserted, can_refer, completep); | |
6e2830c3 | 2171 | matched_vtables->add (BINFO_VTABLE (base_binfo)); |
68377e53 JH |
2172 | } |
2173 | } | |
2174 | } | |
2175 | ||
3462aa02 JH |
2176 | /* When virtual table is removed, we may need to flush the cache. */ |
2177 | ||
2178 | static void | |
2c8326a5 | 2179 | devirt_variable_node_removal_hook (varpool_node *n, |
3462aa02 JH |
2180 | void *d ATTRIBUTE_UNUSED) |
2181 | { | |
2182 | if (cached_polymorphic_call_targets | |
67348ccc DM |
2183 | && DECL_VIRTUAL_P (n->decl) |
2184 | && type_in_anonymous_namespace_p (DECL_CONTEXT (n->decl))) | |
3462aa02 JH |
2185 | free_polymorphic_call_targets_hash (); |
2186 | } | |
2187 | ||
91bc34a9 | 2188 | /* Record about how many calls would benefit from given type to be final. */ |
7d0aa05b | 2189 | |
91bc34a9 JH |
2190 | struct odr_type_warn_count |
2191 | { | |
9716cc3e | 2192 | tree type; |
91bc34a9 JH |
2193 | int count; |
2194 | gcov_type dyn_count; | |
2195 | }; | |
2196 | ||
2197 | /* Record about how many calls would benefit from given method to be final. */ | |
7d0aa05b | 2198 | |
91bc34a9 JH |
2199 | struct decl_warn_count |
2200 | { | |
2201 | tree decl; | |
2202 | int count; | |
2203 | gcov_type dyn_count; | |
2204 | }; | |
2205 | ||
2206 | /* Information about type and decl warnings. */ | |
7d0aa05b | 2207 | |
91bc34a9 JH |
2208 | struct final_warning_record |
2209 | { | |
2210 | gcov_type dyn_count; | |
2211 | vec<odr_type_warn_count> type_warnings; | |
2212 | hash_map<tree, decl_warn_count> decl_warnings; | |
2213 | }; | |
2214 | struct final_warning_record *final_warning_records; | |
2215 | ||
eefe9a99 | 2216 | /* Return vector containing possible targets of polymorphic call of type |
d6ae9a6d SL |
2217 | OTR_TYPE calling method OTR_TOKEN within type of OTR_OUTER_TYPE and OFFSET. |
2218 | If INCLUDE_BASES is true, walk also base types of OUTER_TYPES containing | |
68377e53 JH |
2219 | OTR_TYPE and include their virtual method. This is useful for types |
2220 | possibly in construction or destruction where the virtual table may | |
2221 | temporarily change to one of base types. INCLUDE_DERIVER_TYPES make | |
2222 | us to walk the inheritance graph for all derivations. | |
2223 | ||
add5c763 | 2224 | If COMPLETEP is non-NULL, store true if the list is complete. |
eefe9a99 JH |
2225 | CACHE_TOKEN (if non-NULL) will get stored to an unique ID of entry |
2226 | in the target cache. If user needs to visit every target list | |
2227 | just once, it can memoize them. | |
2228 | ||
2f28755f JH |
2229 | If SPECULATIVE is set, the list will not contain targets that |
2230 | are not speculatively taken. | |
ec77d61f | 2231 | |
eefe9a99 JH |
2232 | Returned vector is placed into cache. It is NOT caller's responsibility |
2233 | to free it. The vector can be freed on cgraph_remove_node call if | |
2234 | the particular node is a virtual function present in the cache. */ | |
2235 | ||
2236 | vec <cgraph_node *> | |
2237 | possible_polymorphic_call_targets (tree otr_type, | |
2238 | HOST_WIDE_INT otr_token, | |
68377e53 JH |
2239 | ipa_polymorphic_call_context context, |
2240 | bool *completep, | |
ec77d61f | 2241 | void **cache_token, |
2f28755f | 2242 | bool speculative) |
eefe9a99 JH |
2243 | { |
2244 | static struct cgraph_node_hook_list *node_removal_hook_holder; | |
add5c763 | 2245 | vec <cgraph_node *> nodes = vNULL; |
1be0e58d | 2246 | auto_vec <tree, 8> bases_to_consider; |
68377e53 | 2247 | odr_type type, outer_type; |
eefe9a99 JH |
2248 | polymorphic_call_target_d key; |
2249 | polymorphic_call_target_d **slot; | |
2250 | unsigned int i; | |
2251 | tree binfo, target; | |
ec77d61f | 2252 | bool complete; |
b2d82f2d | 2253 | bool can_refer = false; |
2d1644bf | 2254 | bool skipped = false; |
eefe9a99 | 2255 | |
c7e1befa JH |
2256 | otr_type = TYPE_MAIN_VARIANT (otr_type); |
2257 | ||
d6ae9a6d | 2258 | /* If ODR is not initialized or the context is invalid, return empty |
6f8091fc | 2259 | incomplete list. */ |
b41e0d29 | 2260 | if (!odr_hash || context.invalid || !TYPE_BINFO (otr_type)) |
3e86c6a8 JH |
2261 | { |
2262 | if (completep) | |
6f8091fc | 2263 | *completep = context.invalid; |
beb683ab MJ |
2264 | if (cache_token) |
2265 | *cache_token = NULL; | |
3e86c6a8 JH |
2266 | return nodes; |
2267 | } | |
2268 | ||
91bc34a9 | 2269 | /* Do not bother to compute speculative info when user do not asks for it. */ |
2f28755f | 2270 | if (!speculative || !context.speculative_outer_type) |
4d7cf10d | 2271 | context.clear_speculation (); |
91bc34a9 | 2272 | |
68377e53 | 2273 | type = get_odr_type (otr_type, true); |
eefe9a99 | 2274 | |
d6ae9a6d | 2275 | /* Recording type variants would waste results cache. */ |
c7e1befa JH |
2276 | gcc_assert (!context.outer_type |
2277 | || TYPE_MAIN_VARIANT (context.outer_type) == context.outer_type); | |
2278 | ||
d6ae9a6d | 2279 | /* Look up the outer class type we want to walk. |
a1981458 | 2280 | If we fail to do so, the context is invalid. */ |
a0fd3373 | 2281 | if ((context.outer_type || context.speculative_outer_type) |
4d7cf10d | 2282 | && !context.restrict_to_inner_class (otr_type)) |
3e86c6a8 JH |
2283 | { |
2284 | if (completep) | |
a1981458 | 2285 | *completep = true; |
beb683ab MJ |
2286 | if (cache_token) |
2287 | *cache_token = NULL; | |
3e86c6a8 JH |
2288 | return nodes; |
2289 | } | |
a1981458 | 2290 | gcc_assert (!context.invalid); |
eefe9a99 | 2291 | |
4d7cf10d | 2292 | /* Check that restrict_to_inner_class kept the main variant. */ |
c7e1befa JH |
2293 | gcc_assert (!context.outer_type |
2294 | || TYPE_MAIN_VARIANT (context.outer_type) == context.outer_type); | |
2295 | ||
79c7de84 | 2296 | /* We canonicalize our query, so we do not need extra hashtable entries. */ |
68377e53 JH |
2297 | |
2298 | /* Without outer type, we have no use for offset. Just do the | |
d6ae9a6d | 2299 | basic search from inner type. */ |
68377e53 | 2300 | if (!context.outer_type) |
6ff65dd7 | 2301 | context.clear_outer_type (otr_type); |
d6ae9a6d | 2302 | /* We need to update our hierarchy if the type does not exist. */ |
68377e53 | 2303 | outer_type = get_odr_type (context.outer_type, true); |
ec77d61f | 2304 | /* If the type is complete, there are no derivations. */ |
68377e53 JH |
2305 | if (TYPE_FINAL_P (outer_type->type)) |
2306 | context.maybe_derived_type = false; | |
eefe9a99 JH |
2307 | |
2308 | /* Initialize query cache. */ | |
2309 | if (!cached_polymorphic_call_targets) | |
2310 | { | |
6e2830c3 | 2311 | cached_polymorphic_call_targets = new hash_set<cgraph_node *>; |
c203e8a7 TS |
2312 | polymorphic_call_target_hash |
2313 | = new polymorphic_call_target_hash_type (23); | |
eefe9a99 | 2314 | if (!node_removal_hook_holder) |
3462aa02 JH |
2315 | { |
2316 | node_removal_hook_holder = | |
3dafb85c ML |
2317 | symtab->add_cgraph_removal_hook (&devirt_node_removal_hook, NULL); |
2318 | symtab->add_varpool_removal_hook (&devirt_variable_node_removal_hook, | |
3462aa02 JH |
2319 | NULL); |
2320 | } | |
eefe9a99 JH |
2321 | } |
2322 | ||
21a9ce6e JH |
2323 | if (in_lto_p) |
2324 | { | |
2325 | if (context.outer_type != otr_type) | |
2326 | context.outer_type | |
2327 | = get_odr_type (context.outer_type, true)->type; | |
2328 | if (context.speculative_outer_type) | |
2329 | context.speculative_outer_type | |
2330 | = get_odr_type (context.speculative_outer_type, true)->type; | |
2331 | } | |
2332 | ||
d6ae9a6d | 2333 | /* Look up cached answer. */ |
eefe9a99 JH |
2334 | key.type = type; |
2335 | key.otr_token = otr_token; | |
2f28755f | 2336 | key.speculative = speculative; |
68377e53 | 2337 | key.context = context; |
c203e8a7 | 2338 | slot = polymorphic_call_target_hash->find_slot (&key, INSERT); |
eefe9a99 JH |
2339 | if (cache_token) |
2340 | *cache_token = (void *)*slot; | |
2341 | if (*slot) | |
68377e53 JH |
2342 | { |
2343 | if (completep) | |
ec77d61f | 2344 | *completep = (*slot)->complete; |
91bc34a9 JH |
2345 | if ((*slot)->type_warning && final_warning_records) |
2346 | { | |
2347 | final_warning_records->type_warnings[(*slot)->type_warning - 1].count++; | |
2348 | final_warning_records->type_warnings[(*slot)->type_warning - 1].dyn_count | |
2349 | += final_warning_records->dyn_count; | |
2350 | } | |
2f28755f | 2351 | if (!speculative && (*slot)->decl_warning && final_warning_records) |
91bc34a9 JH |
2352 | { |
2353 | struct decl_warn_count *c = | |
2354 | final_warning_records->decl_warnings.get ((*slot)->decl_warning); | |
2355 | c->count++; | |
2356 | c->dyn_count += final_warning_records->dyn_count; | |
2357 | } | |
68377e53 JH |
2358 | return (*slot)->targets; |
2359 | } | |
2360 | ||
ec77d61f | 2361 | complete = true; |
eefe9a99 JH |
2362 | |
2363 | /* Do actual search. */ | |
2364 | timevar_push (TV_IPA_VIRTUAL_CALL); | |
2365 | *slot = XCNEW (polymorphic_call_target_d); | |
2366 | if (cache_token) | |
68377e53 | 2367 | *cache_token = (void *)*slot; |
eefe9a99 JH |
2368 | (*slot)->type = type; |
2369 | (*slot)->otr_token = otr_token; | |
68377e53 | 2370 | (*slot)->context = context; |
2f28755f | 2371 | (*slot)->speculative = speculative; |
eefe9a99 | 2372 | |
6e2830c3 TS |
2373 | hash_set<tree> inserted; |
2374 | hash_set<tree> matched_vtables; | |
eefe9a99 | 2375 | |
91bc34a9 | 2376 | /* First insert targets we speculatively identified as likely. */ |
a0fd3373 JH |
2377 | if (context.speculative_outer_type) |
2378 | { | |
2379 | odr_type speculative_outer_type; | |
91bc34a9 JH |
2380 | bool speculation_complete = true; |
2381 | ||
d6ae9a6d SL |
2382 | /* First insert target from type itself and check if it may have |
2383 | derived types. */ | |
a0fd3373 JH |
2384 | speculative_outer_type = get_odr_type (context.speculative_outer_type, true); |
2385 | if (TYPE_FINAL_P (speculative_outer_type->type)) | |
2386 | context.speculative_maybe_derived_type = false; | |
2387 | binfo = get_binfo_at_offset (TYPE_BINFO (speculative_outer_type->type), | |
2388 | context.speculative_offset, otr_type); | |
2389 | if (binfo) | |
2390 | target = gimple_get_virt_method_for_binfo (otr_token, binfo, | |
2391 | &can_refer); | |
2392 | else | |
2393 | target = NULL; | |
2394 | ||
91bc34a9 JH |
2395 | /* In the case we get complete method, we don't need |
2396 | to walk derivations. */ | |
2397 | if (target && DECL_FINAL_P (target)) | |
2398 | context.speculative_maybe_derived_type = false; | |
a0fd3373 | 2399 | if (type_possibly_instantiated_p (speculative_outer_type->type)) |
91bc34a9 | 2400 | maybe_record_node (nodes, target, &inserted, can_refer, &speculation_complete); |
a0fd3373 | 2401 | if (binfo) |
6e2830c3 | 2402 | matched_vtables.add (BINFO_VTABLE (binfo)); |
91bc34a9 | 2403 | |
9716cc3e | 2404 | |
a0fd3373 JH |
2405 | /* Next walk recursively all derived types. */ |
2406 | if (context.speculative_maybe_derived_type) | |
91bc34a9 JH |
2407 | for (i = 0; i < speculative_outer_type->derived_types.length(); i++) |
2408 | possible_polymorphic_call_targets_1 (nodes, &inserted, | |
2409 | &matched_vtables, | |
2410 | otr_type, | |
2411 | speculative_outer_type->derived_types[i], | |
2412 | otr_token, speculative_outer_type->type, | |
2413 | context.speculative_offset, | |
2414 | &speculation_complete, | |
2415 | bases_to_consider, | |
2416 | false); | |
a0fd3373 JH |
2417 | } |
2418 | ||
2f28755f | 2419 | if (!speculative || !nodes.length ()) |
68377e53 | 2420 | { |
2f28755f JH |
2421 | /* First see virtual method of type itself. */ |
2422 | binfo = get_binfo_at_offset (TYPE_BINFO (outer_type->type), | |
2423 | context.offset, otr_type); | |
2424 | if (binfo) | |
2425 | target = gimple_get_virt_method_for_binfo (otr_token, binfo, | |
2426 | &can_refer); | |
2427 | else | |
2428 | { | |
2429 | gcc_assert (odr_violation_reported); | |
2430 | target = NULL; | |
2431 | } | |
68377e53 | 2432 | |
2f28755f JH |
2433 | /* Destructors are never called through construction virtual tables, |
2434 | because the type is always known. */ | |
2435 | if (target && DECL_CXX_DESTRUCTOR_P (target)) | |
2436 | context.maybe_in_construction = false; | |
ec77d61f | 2437 | |
2f28755f JH |
2438 | if (target) |
2439 | { | |
2440 | /* In the case we get complete method, we don't need | |
2441 | to walk derivations. */ | |
2442 | if (DECL_FINAL_P (target)) | |
2443 | context.maybe_derived_type = false; | |
2444 | } | |
2d1644bf | 2445 | |
2f28755f JH |
2446 | /* If OUTER_TYPE is abstract, we know we are not seeing its instance. */ |
2447 | if (type_possibly_instantiated_p (outer_type->type)) | |
2448 | maybe_record_node (nodes, target, &inserted, can_refer, &complete); | |
2449 | else | |
2450 | skipped = true; | |
79c7de84 | 2451 | |
2f28755f JH |
2452 | if (binfo) |
2453 | matched_vtables.add (BINFO_VTABLE (binfo)); | |
eefe9a99 | 2454 | |
2f28755f JH |
2455 | /* Next walk recursively all derived types. */ |
2456 | if (context.maybe_derived_type) | |
91bc34a9 | 2457 | { |
2f28755f JH |
2458 | for (i = 0; i < outer_type->derived_types.length(); i++) |
2459 | possible_polymorphic_call_targets_1 (nodes, &inserted, | |
2460 | &matched_vtables, | |
2461 | otr_type, | |
2462 | outer_type->derived_types[i], | |
2463 | otr_token, outer_type->type, | |
2464 | context.offset, &complete, | |
2465 | bases_to_consider, | |
2466 | context.maybe_in_construction); | |
2467 | ||
2468 | if (!outer_type->all_derivations_known) | |
91bc34a9 | 2469 | { |
2f28755f | 2470 | if (!speculative && final_warning_records) |
91bc34a9 | 2471 | { |
2f28755f JH |
2472 | if (complete |
2473 | && nodes.length () == 1 | |
2474 | && warn_suggest_final_types | |
2475 | && !outer_type->derived_types.length ()) | |
91bc34a9 | 2476 | { |
2f28755f JH |
2477 | if (outer_type->id >= (int)final_warning_records->type_warnings.length ()) |
2478 | final_warning_records->type_warnings.safe_grow_cleared | |
2479 | (odr_types.length ()); | |
2480 | final_warning_records->type_warnings[outer_type->id].count++; | |
2481 | final_warning_records->type_warnings[outer_type->id].dyn_count | |
2482 | += final_warning_records->dyn_count; | |
2483 | final_warning_records->type_warnings[outer_type->id].type | |
2484 | = outer_type->type; | |
2485 | (*slot)->type_warning = outer_type->id + 1; | |
91bc34a9 | 2486 | } |
2f28755f JH |
2487 | if (complete |
2488 | && warn_suggest_final_methods | |
2489 | && nodes.length () == 1 | |
2490 | && types_same_for_odr (DECL_CONTEXT (nodes[0]->decl), | |
2491 | outer_type->type)) | |
91bc34a9 | 2492 | { |
2f28755f JH |
2493 | bool existed; |
2494 | struct decl_warn_count &c = | |
2495 | final_warning_records->decl_warnings.get_or_insert | |
2496 | (nodes[0]->decl, &existed); | |
2497 | ||
2498 | if (existed) | |
2499 | { | |
2500 | c.count++; | |
2501 | c.dyn_count += final_warning_records->dyn_count; | |
2502 | } | |
2503 | else | |
2504 | { | |
2505 | c.count = 1; | |
2506 | c.dyn_count = final_warning_records->dyn_count; | |
2507 | c.decl = nodes[0]->decl; | |
2508 | } | |
2509 | (*slot)->decl_warning = nodes[0]->decl; | |
91bc34a9 | 2510 | } |
91bc34a9 | 2511 | } |
2f28755f | 2512 | complete = false; |
91bc34a9 | 2513 | } |
91bc34a9 | 2514 | } |
2d1644bf | 2515 | |
2f28755f JH |
2516 | if (!speculative) |
2517 | { | |
2518 | /* Destructors are never called through construction virtual tables, | |
d6ae9a6d SL |
2519 | because the type is always known. One of entries may be |
2520 | cxa_pure_virtual so look to at least two of them. */ | |
2f28755f JH |
2521 | if (context.maybe_in_construction) |
2522 | for (i =0 ; i < MIN (nodes.length (), 2); i++) | |
2523 | if (DECL_CXX_DESTRUCTOR_P (nodes[i]->decl)) | |
2524 | context.maybe_in_construction = false; | |
2525 | if (context.maybe_in_construction) | |
2526 | { | |
2527 | if (type != outer_type | |
2528 | && (!skipped | |
2529 | || (context.maybe_derived_type | |
2530 | && !type_all_derivations_known_p (outer_type->type)))) | |
2531 | record_targets_from_bases (otr_type, otr_token, outer_type->type, | |
2532 | context.offset, nodes, &inserted, | |
2533 | &matched_vtables, &complete); | |
2534 | if (skipped) | |
2535 | maybe_record_node (nodes, target, &inserted, can_refer, &complete); | |
2536 | for (i = 0; i < bases_to_consider.length(); i++) | |
2537 | maybe_record_node (nodes, bases_to_consider[i], &inserted, can_refer, &complete); | |
2538 | } | |
2539 | } | |
2d1644bf | 2540 | } |
ec77d61f | 2541 | |
eefe9a99 | 2542 | (*slot)->targets = nodes; |
ec77d61f | 2543 | (*slot)->complete = complete; |
68377e53 | 2544 | if (completep) |
ec77d61f | 2545 | *completep = complete; |
eefe9a99 | 2546 | |
eefe9a99 JH |
2547 | timevar_pop (TV_IPA_VIRTUAL_CALL); |
2548 | return nodes; | |
2549 | } | |
2550 | ||
91bc34a9 JH |
2551 | bool |
2552 | add_decl_warning (const tree &key ATTRIBUTE_UNUSED, const decl_warn_count &value, | |
2553 | vec<const decl_warn_count*> *vec) | |
2554 | { | |
2555 | vec->safe_push (&value); | |
2556 | return true; | |
2557 | } | |
2558 | ||
2f28755f JH |
2559 | /* Dump target list TARGETS into FILE. */ |
2560 | ||
2561 | static void | |
2562 | dump_targets (FILE *f, vec <cgraph_node *> targets) | |
2563 | { | |
2564 | unsigned int i; | |
2565 | ||
2566 | for (i = 0; i < targets.length (); i++) | |
2567 | { | |
2568 | char *name = NULL; | |
2569 | if (in_lto_p) | |
2570 | name = cplus_demangle_v3 (targets[i]->asm_name (), 0); | |
2571 | fprintf (f, " %s/%i", name ? name : targets[i]->name (), targets[i]->order); | |
2572 | if (in_lto_p) | |
2573 | free (name); | |
2574 | if (!targets[i]->definition) | |
2575 | fprintf (f, " (no definition%s)", | |
2576 | DECL_DECLARED_INLINE_P (targets[i]->decl) | |
2577 | ? " inline" : ""); | |
2578 | } | |
2579 | fprintf (f, "\n"); | |
2580 | } | |
2581 | ||
eefe9a99 JH |
2582 | /* Dump all possible targets of a polymorphic call. */ |
2583 | ||
2584 | void | |
2585 | dump_possible_polymorphic_call_targets (FILE *f, | |
68377e53 JH |
2586 | tree otr_type, |
2587 | HOST_WIDE_INT otr_token, | |
2588 | const ipa_polymorphic_call_context &ctx) | |
eefe9a99 JH |
2589 | { |
2590 | vec <cgraph_node *> targets; | |
2591 | bool final; | |
549bcbd1 | 2592 | odr_type type = get_odr_type (TYPE_MAIN_VARIANT (otr_type), false); |
2f28755f | 2593 | unsigned int len; |
eefe9a99 JH |
2594 | |
2595 | if (!type) | |
2596 | return; | |
2597 | targets = possible_polymorphic_call_targets (otr_type, otr_token, | |
68377e53 | 2598 | ctx, |
2f28755f | 2599 | &final, NULL, false); |
68377e53 | 2600 | fprintf (f, " Targets of polymorphic call of type %i:", type->id); |
eefe9a99 | 2601 | print_generic_expr (f, type->type, TDF_SLIM); |
ec77d61f | 2602 | fprintf (f, " token %i\n", (int)otr_token); |
a1981458 JH |
2603 | |
2604 | ctx.dump (f); | |
ec77d61f | 2605 | |
a0fd3373 | 2606 | fprintf (f, " %s%s%s%s\n ", |
ec77d61f | 2607 | final ? "This is a complete list." : |
68377e53 JH |
2608 | "This is partial list; extra targets may be defined in other units.", |
2609 | ctx.maybe_in_construction ? " (base types included)" : "", | |
a0fd3373 JH |
2610 | ctx.maybe_derived_type ? " (derived types included)" : "", |
2611 | ctx.speculative_maybe_derived_type ? " (speculative derived types included)" : ""); | |
2f28755f JH |
2612 | len = targets.length (); |
2613 | dump_targets (f, targets); | |
2614 | ||
2615 | targets = possible_polymorphic_call_targets (otr_type, otr_token, | |
2616 | ctx, | |
2617 | &final, NULL, true); | |
2618 | gcc_assert (targets.length () <= len); | |
2619 | if (targets.length () != len) | |
ec77d61f | 2620 | { |
2f28755f JH |
2621 | fprintf (f, " Speculative targets:"); |
2622 | dump_targets (f, targets); | |
ec77d61f | 2623 | } |
2f28755f | 2624 | fprintf (f, "\n"); |
eefe9a99 JH |
2625 | } |
2626 | ||
0e1474e5 JH |
2627 | |
2628 | /* Return true if N can be possibly target of a polymorphic call of | |
2629 | OTR_TYPE/OTR_TOKEN. */ | |
2630 | ||
2631 | bool | |
2632 | possible_polymorphic_call_target_p (tree otr_type, | |
2633 | HOST_WIDE_INT otr_token, | |
68377e53 | 2634 | const ipa_polymorphic_call_context &ctx, |
0e1474e5 JH |
2635 | struct cgraph_node *n) |
2636 | { | |
2637 | vec <cgraph_node *> targets; | |
2638 | unsigned int i; | |
68377e53 | 2639 | enum built_in_function fcode; |
450ad0cd | 2640 | bool final; |
0e1474e5 | 2641 | |
68377e53 JH |
2642 | if (TREE_CODE (TREE_TYPE (n->decl)) == FUNCTION_TYPE |
2643 | && ((fcode = DECL_FUNCTION_CODE (n->decl)) | |
2644 | == BUILT_IN_UNREACHABLE | |
2645 | || fcode == BUILT_IN_TRAP)) | |
2646 | return true; | |
2647 | ||
c203e8a7 | 2648 | if (!odr_hash) |
0e1474e5 | 2649 | return true; |
68377e53 | 2650 | targets = possible_polymorphic_call_targets (otr_type, otr_token, ctx, &final); |
0e1474e5 | 2651 | for (i = 0; i < targets.length (); i++) |
d52f5295 | 2652 | if (n->semantically_equivalent_p (targets[i])) |
0e1474e5 | 2653 | return true; |
450ad0cd JH |
2654 | |
2655 | /* At a moment we allow middle end to dig out new external declarations | |
2656 | as a targets of polymorphic calls. */ | |
67348ccc | 2657 | if (!final && !n->definition) |
450ad0cd | 2658 | return true; |
0e1474e5 JH |
2659 | return false; |
2660 | } | |
2661 | ||
2662 | ||
6f8091fc JH |
2663 | |
2664 | /* Return true if N can be possibly target of a polymorphic call of | |
2665 | OBJ_TYPE_REF expression REF in STMT. */ | |
2666 | ||
2667 | bool | |
2668 | possible_polymorphic_call_target_p (tree ref, | |
2669 | gimple stmt, | |
2670 | struct cgraph_node *n) | |
2671 | { | |
2672 | ipa_polymorphic_call_context context (current_function_decl, ref, stmt); | |
2673 | tree call_fn = gimple_call_fn (stmt); | |
2674 | ||
2675 | return possible_polymorphic_call_target_p (obj_type_ref_class (call_fn), | |
2676 | tree_to_uhwi | |
2677 | (OBJ_TYPE_REF_TOKEN (call_fn)), | |
2678 | context, | |
2679 | n); | |
2680 | } | |
2681 | ||
2682 | ||
0e1474e5 JH |
2683 | /* After callgraph construction new external nodes may appear. |
2684 | Add them into the graph. */ | |
2685 | ||
2686 | void | |
2687 | update_type_inheritance_graph (void) | |
2688 | { | |
2689 | struct cgraph_node *n; | |
2690 | ||
c203e8a7 | 2691 | if (!odr_hash) |
0e1474e5 JH |
2692 | return; |
2693 | free_polymorphic_call_targets_hash (); | |
2694 | timevar_push (TV_IPA_INHERITANCE); | |
68377e53 | 2695 | /* We reconstruct the graph starting from types of all methods seen in the |
0e1474e5 JH |
2696 | the unit. */ |
2697 | FOR_EACH_FUNCTION (n) | |
67348ccc DM |
2698 | if (DECL_VIRTUAL_P (n->decl) |
2699 | && !n->definition | |
d52f5295 | 2700 | && n->real_symbol_p ()) |
549bcbd1 JH |
2701 | get_odr_type (method_class_type (TYPE_MAIN_VARIANT (TREE_TYPE (n->decl))), |
2702 | true); | |
0e1474e5 JH |
2703 | timevar_pop (TV_IPA_INHERITANCE); |
2704 | } | |
bbc9396b JH |
2705 | |
2706 | ||
2707 | /* Return true if N looks like likely target of a polymorphic call. | |
2708 | Rule out cxa_pure_virtual, noreturns, function declared cold and | |
2709 | other obvious cases. */ | |
2710 | ||
2711 | bool | |
2712 | likely_target_p (struct cgraph_node *n) | |
2713 | { | |
2714 | int flags; | |
2715 | /* cxa_pure_virtual and similar things are not likely. */ | |
67348ccc | 2716 | if (TREE_CODE (TREE_TYPE (n->decl)) != METHOD_TYPE) |
bbc9396b | 2717 | return false; |
67348ccc | 2718 | flags = flags_from_decl_or_type (n->decl); |
bbc9396b JH |
2719 | if (flags & ECF_NORETURN) |
2720 | return false; | |
2721 | if (lookup_attribute ("cold", | |
67348ccc | 2722 | DECL_ATTRIBUTES (n->decl))) |
bbc9396b JH |
2723 | return false; |
2724 | if (n->frequency < NODE_FREQUENCY_NORMAL) | |
2725 | return false; | |
d6ae9a6d SL |
2726 | /* If there are no live virtual tables referring the target, |
2727 | the only way the target can be called is an instance coming from other | |
2728 | compilation unit; speculative devirtualization is built around an | |
ccb05ef2 JH |
2729 | assumption that won't happen. */ |
2730 | if (!referenced_from_vtable_p (n)) | |
2731 | return false; | |
bbc9396b JH |
2732 | return true; |
2733 | } | |
2734 | ||
d6ae9a6d | 2735 | /* Compare type warning records P1 and P2 and choose one with larger count; |
91bc34a9 JH |
2736 | helper for qsort. */ |
2737 | ||
2738 | int | |
2739 | type_warning_cmp (const void *p1, const void *p2) | |
2740 | { | |
2741 | const odr_type_warn_count *t1 = (const odr_type_warn_count *)p1; | |
2742 | const odr_type_warn_count *t2 = (const odr_type_warn_count *)p2; | |
2743 | ||
2744 | if (t1->dyn_count < t2->dyn_count) | |
2745 | return 1; | |
2746 | if (t1->dyn_count > t2->dyn_count) | |
2747 | return -1; | |
2748 | return t2->count - t1->count; | |
2749 | } | |
2750 | ||
d6ae9a6d | 2751 | /* Compare decl warning records P1 and P2 and choose one with larger count; |
91bc34a9 JH |
2752 | helper for qsort. */ |
2753 | ||
2754 | int | |
2755 | decl_warning_cmp (const void *p1, const void *p2) | |
2756 | { | |
2757 | const decl_warn_count *t1 = *(const decl_warn_count * const *)p1; | |
2758 | const decl_warn_count *t2 = *(const decl_warn_count * const *)p2; | |
2759 | ||
2760 | if (t1->dyn_count < t2->dyn_count) | |
2761 | return 1; | |
2762 | if (t1->dyn_count > t2->dyn_count) | |
2763 | return -1; | |
2764 | return t2->count - t1->count; | |
2765 | } | |
2766 | ||
5ce97055 | 2767 | |
d6ae9a6d | 2768 | /* Try to speculatively devirtualize call to OTR_TYPE with OTR_TOKEN with |
5ce97055 JH |
2769 | context CTX. */ |
2770 | ||
2771 | struct cgraph_node * | |
2772 | try_speculative_devirtualization (tree otr_type, HOST_WIDE_INT otr_token, | |
2773 | ipa_polymorphic_call_context ctx) | |
2774 | { | |
2775 | vec <cgraph_node *>targets | |
2776 | = possible_polymorphic_call_targets | |
2777 | (otr_type, otr_token, ctx, NULL, NULL, true); | |
2778 | unsigned int i; | |
2779 | struct cgraph_node *likely_target = NULL; | |
2780 | ||
2781 | for (i = 0; i < targets.length (); i++) | |
2782 | if (likely_target_p (targets[i])) | |
2783 | { | |
2784 | if (likely_target) | |
2785 | return NULL; | |
2786 | likely_target = targets[i]; | |
2787 | } | |
2788 | if (!likely_target | |
2789 | ||!likely_target->definition | |
2790 | || DECL_EXTERNAL (likely_target->decl)) | |
2791 | return NULL; | |
2792 | ||
2793 | /* Don't use an implicitly-declared destructor (c++/58678). */ | |
2794 | struct cgraph_node *non_thunk_target | |
2795 | = likely_target->function_symbol (); | |
2796 | if (DECL_ARTIFICIAL (non_thunk_target->decl)) | |
2797 | return NULL; | |
2798 | if (likely_target->get_availability () <= AVAIL_INTERPOSABLE | |
2799 | && likely_target->can_be_discarded_p ()) | |
2800 | return NULL; | |
2801 | return likely_target; | |
2802 | } | |
2803 | ||
bbc9396b | 2804 | /* The ipa-devirt pass. |
3462aa02 | 2805 | When polymorphic call has only one likely target in the unit, |
d6ae9a6d | 2806 | turn it into a speculative call. */ |
bbc9396b JH |
2807 | |
2808 | static unsigned int | |
2809 | ipa_devirt (void) | |
2810 | { | |
2811 | struct cgraph_node *n; | |
6e2830c3 | 2812 | hash_set<void *> bad_call_targets; |
bbc9396b JH |
2813 | struct cgraph_edge *e; |
2814 | ||
2815 | int npolymorphic = 0, nspeculated = 0, nconverted = 0, ncold = 0; | |
2816 | int nmultiple = 0, noverwritable = 0, ndevirtualized = 0, nnotdefined = 0; | |
570215f9 | 2817 | int nwrong = 0, nok = 0, nexternal = 0, nartificial = 0; |
bbc9396b | 2818 | |
4cd5658b MT |
2819 | if (!odr_types_ptr) |
2820 | return 0; | |
2821 | ||
91bc34a9 JH |
2822 | /* We can output -Wsuggest-final-methods and -Wsuggest-final-types warnings. |
2823 | This is implemented by setting up final_warning_records that are updated | |
2824 | by get_polymorphic_call_targets. | |
2825 | We need to clear cache in this case to trigger recomputation of all | |
2826 | entries. */ | |
2827 | if (warn_suggest_final_methods || warn_suggest_final_types) | |
2828 | { | |
2829 | final_warning_records = new (final_warning_record); | |
2830 | final_warning_records->type_warnings = vNULL; | |
2831 | final_warning_records->type_warnings.safe_grow_cleared (odr_types.length ()); | |
2832 | free_polymorphic_call_targets_hash (); | |
2833 | } | |
2834 | ||
bbc9396b JH |
2835 | FOR_EACH_DEFINED_FUNCTION (n) |
2836 | { | |
2837 | bool update = false; | |
2bf86c84 JH |
2838 | if (!opt_for_fn (n->decl, flag_devirtualize)) |
2839 | continue; | |
bbc9396b JH |
2840 | if (dump_file && n->indirect_calls) |
2841 | fprintf (dump_file, "\n\nProcesing function %s/%i\n", | |
fec39fa6 | 2842 | n->name (), n->order); |
bbc9396b JH |
2843 | for (e = n->indirect_calls; e; e = e->next_callee) |
2844 | if (e->indirect_info->polymorphic) | |
2845 | { | |
2846 | struct cgraph_node *likely_target = NULL; | |
2847 | void *cache_token; | |
2848 | bool final; | |
91bc34a9 JH |
2849 | |
2850 | if (final_warning_records) | |
2851 | final_warning_records->dyn_count = e->count; | |
2852 | ||
bbc9396b JH |
2853 | vec <cgraph_node *>targets |
2854 | = possible_polymorphic_call_targets | |
2f28755f | 2855 | (e, &final, &cache_token, true); |
bbc9396b JH |
2856 | unsigned int i; |
2857 | ||
2f28755f JH |
2858 | /* Trigger warnings by calculating non-speculative targets. */ |
2859 | if (warn_suggest_final_methods || warn_suggest_final_types) | |
2860 | possible_polymorphic_call_targets (e); | |
2861 | ||
bbc9396b JH |
2862 | if (dump_file) |
2863 | dump_possible_polymorphic_call_targets | |
2864 | (dump_file, e); | |
3462aa02 | 2865 | |
bbc9396b JH |
2866 | npolymorphic++; |
2867 | ||
2bf86c84 | 2868 | if (!opt_for_fn (n->decl, flag_devirtualize_speculatively)) |
91bc34a9 JH |
2869 | continue; |
2870 | ||
3dafb85c | 2871 | if (!e->maybe_hot_p ()) |
bbc9396b JH |
2872 | { |
2873 | if (dump_file) | |
ec77d61f | 2874 | fprintf (dump_file, "Call is cold\n\n"); |
bbc9396b JH |
2875 | ncold++; |
2876 | continue; | |
2877 | } | |
2878 | if (e->speculative) | |
2879 | { | |
2880 | if (dump_file) | |
d6ae9a6d | 2881 | fprintf (dump_file, "Call is already speculated\n\n"); |
bbc9396b JH |
2882 | nspeculated++; |
2883 | ||
2884 | /* When dumping see if we agree with speculation. */ | |
2885 | if (!dump_file) | |
2886 | continue; | |
2887 | } | |
6e2830c3 | 2888 | if (bad_call_targets.contains (cache_token)) |
bbc9396b JH |
2889 | { |
2890 | if (dump_file) | |
ec77d61f | 2891 | fprintf (dump_file, "Target list is known to be useless\n\n"); |
bbc9396b JH |
2892 | nmultiple++; |
2893 | continue; | |
2894 | } | |
c3284718 | 2895 | for (i = 0; i < targets.length (); i++) |
bbc9396b JH |
2896 | if (likely_target_p (targets[i])) |
2897 | { | |
2898 | if (likely_target) | |
2899 | { | |
2f28755f JH |
2900 | likely_target = NULL; |
2901 | if (dump_file) | |
2902 | fprintf (dump_file, "More than one likely target\n\n"); | |
2903 | nmultiple++; | |
bbc9396b JH |
2904 | break; |
2905 | } | |
2906 | likely_target = targets[i]; | |
2907 | } | |
2908 | if (!likely_target) | |
2909 | { | |
6e2830c3 | 2910 | bad_call_targets.add (cache_token); |
bbc9396b JH |
2911 | continue; |
2912 | } | |
2913 | /* This is reached only when dumping; check if we agree or disagree | |
2914 | with the speculation. */ | |
2915 | if (e->speculative) | |
2916 | { | |
2917 | struct cgraph_edge *e2; | |
2918 | struct ipa_ref *ref; | |
3dafb85c | 2919 | e->speculative_call_info (e2, e, ref); |
d52f5295 ML |
2920 | if (e2->callee->ultimate_alias_target () |
2921 | == likely_target->ultimate_alias_target ()) | |
bbc9396b | 2922 | { |
ec77d61f | 2923 | fprintf (dump_file, "We agree with speculation\n\n"); |
bbc9396b JH |
2924 | nok++; |
2925 | } | |
2926 | else | |
2927 | { | |
ec77d61f | 2928 | fprintf (dump_file, "We disagree with speculation\n\n"); |
bbc9396b JH |
2929 | nwrong++; |
2930 | } | |
2931 | continue; | |
2932 | } | |
67348ccc | 2933 | if (!likely_target->definition) |
bbc9396b JH |
2934 | { |
2935 | if (dump_file) | |
d6ae9a6d | 2936 | fprintf (dump_file, "Target is not a definition\n\n"); |
bbc9396b JH |
2937 | nnotdefined++; |
2938 | continue; | |
2939 | } | |
2940 | /* Do not introduce new references to external symbols. While we | |
2941 | can handle these just well, it is common for programs to | |
2942 | incorrectly with headers defining methods they are linked | |
2943 | with. */ | |
67348ccc | 2944 | if (DECL_EXTERNAL (likely_target->decl)) |
bbc9396b JH |
2945 | { |
2946 | if (dump_file) | |
ec77d61f | 2947 | fprintf (dump_file, "Target is external\n\n"); |
bbc9396b JH |
2948 | nexternal++; |
2949 | continue; | |
2950 | } | |
570215f9 JM |
2951 | /* Don't use an implicitly-declared destructor (c++/58678). */ |
2952 | struct cgraph_node *non_thunk_target | |
d52f5295 | 2953 | = likely_target->function_symbol (); |
89632536 | 2954 | if (DECL_ARTIFICIAL (non_thunk_target->decl)) |
570215f9 JM |
2955 | { |
2956 | if (dump_file) | |
2957 | fprintf (dump_file, "Target is artificial\n\n"); | |
2958 | nartificial++; | |
2959 | continue; | |
2960 | } | |
d52f5295 ML |
2961 | if (likely_target->get_availability () <= AVAIL_INTERPOSABLE |
2962 | && likely_target->can_be_discarded_p ()) | |
bbc9396b JH |
2963 | { |
2964 | if (dump_file) | |
ec77d61f | 2965 | fprintf (dump_file, "Target is overwritable\n\n"); |
bbc9396b JH |
2966 | noverwritable++; |
2967 | continue; | |
2968 | } | |
2b5f0895 | 2969 | else if (dbg_cnt (devirt)) |
bbc9396b | 2970 | { |
2b5f0895 XDL |
2971 | if (dump_enabled_p ()) |
2972 | { | |
807b7d62 | 2973 | location_t locus = gimple_location_safe (e->call_stmt); |
2b5f0895 XDL |
2974 | dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, locus, |
2975 | "speculatively devirtualizing call in %s/%i to %s/%i\n", | |
2976 | n->name (), n->order, | |
2977 | likely_target->name (), | |
2978 | likely_target->order); | |
2979 | } | |
d52f5295 | 2980 | if (!likely_target->can_be_discarded_p ()) |
5b79657a JH |
2981 | { |
2982 | cgraph_node *alias; | |
d52f5295 | 2983 | alias = dyn_cast<cgraph_node *> (likely_target->noninterposable_alias ()); |
5b79657a JH |
2984 | if (alias) |
2985 | likely_target = alias; | |
2986 | } | |
bbc9396b JH |
2987 | nconverted++; |
2988 | update = true; | |
3dafb85c ML |
2989 | e->make_speculative |
2990 | (likely_target, e->count * 8 / 10, e->frequency * 8 / 10); | |
bbc9396b JH |
2991 | } |
2992 | } | |
2993 | if (update) | |
2994 | inline_update_overall_summary (n); | |
2995 | } | |
91bc34a9 JH |
2996 | if (warn_suggest_final_methods || warn_suggest_final_types) |
2997 | { | |
2998 | if (warn_suggest_final_types) | |
2999 | { | |
3000 | final_warning_records->type_warnings.qsort (type_warning_cmp); | |
3001 | for (unsigned int i = 0; | |
3002 | i < final_warning_records->type_warnings.length (); i++) | |
3003 | if (final_warning_records->type_warnings[i].count) | |
3004 | { | |
9716cc3e | 3005 | tree type = final_warning_records->type_warnings[i].type; |
26e82579 JH |
3006 | int count = final_warning_records->type_warnings[i].count; |
3007 | long long dyn_count | |
3008 | = final_warning_records->type_warnings[i].dyn_count; | |
3009 | ||
3010 | if (!dyn_count) | |
3011 | warning_n (DECL_SOURCE_LOCATION (TYPE_NAME (type)), | |
3012 | OPT_Wsuggest_final_types, count, | |
3013 | "Declaring type %qD final " | |
3014 | "would enable devirtualization of %i call", | |
3015 | "Declaring type %qD final " | |
3016 | "would enable devirtualization of %i calls", | |
3017 | type, | |
3018 | count); | |
3019 | else | |
3020 | warning_n (DECL_SOURCE_LOCATION (TYPE_NAME (type)), | |
3021 | OPT_Wsuggest_final_types, count, | |
3022 | "Declaring type %qD final " | |
3023 | "would enable devirtualization of %i call " | |
3024 | "executed %lli times", | |
3025 | "Declaring type %qD final " | |
3026 | "would enable devirtualization of %i calls " | |
3027 | "executed %lli times", | |
3028 | type, | |
3029 | count, | |
3030 | dyn_count); | |
91bc34a9 JH |
3031 | } |
3032 | } | |
3033 | ||
3034 | if (warn_suggest_final_methods) | |
3035 | { | |
3036 | vec<const decl_warn_count*> decl_warnings_vec = vNULL; | |
3037 | ||
3038 | final_warning_records->decl_warnings.traverse | |
3039 | <vec<const decl_warn_count *> *, add_decl_warning> (&decl_warnings_vec); | |
3040 | decl_warnings_vec.qsort (decl_warning_cmp); | |
3041 | for (unsigned int i = 0; i < decl_warnings_vec.length (); i++) | |
3042 | { | |
3043 | tree decl = decl_warnings_vec[i]->decl; | |
3044 | int count = decl_warnings_vec[i]->count; | |
26e82579 JH |
3045 | long long dyn_count = decl_warnings_vec[i]->dyn_count; |
3046 | ||
3047 | if (!dyn_count) | |
3048 | if (DECL_CXX_DESTRUCTOR_P (decl)) | |
3049 | warning_n (DECL_SOURCE_LOCATION (decl), | |
3050 | OPT_Wsuggest_final_methods, count, | |
3051 | "Declaring virtual destructor of %qD final " | |
3052 | "would enable devirtualization of %i call", | |
3053 | "Declaring virtual destructor of %qD final " | |
3054 | "would enable devirtualization of %i calls", | |
3055 | DECL_CONTEXT (decl), count); | |
3056 | else | |
3057 | warning_n (DECL_SOURCE_LOCATION (decl), | |
3058 | OPT_Wsuggest_final_methods, count, | |
3059 | "Declaring method %qD final " | |
3060 | "would enable devirtualization of %i call", | |
3061 | "Declaring method %qD final " | |
3062 | "would enable devirtualization of %i calls", | |
3063 | decl, count); | |
3064 | else if (DECL_CXX_DESTRUCTOR_P (decl)) | |
3065 | warning_n (DECL_SOURCE_LOCATION (decl), | |
3066 | OPT_Wsuggest_final_methods, count, | |
3067 | "Declaring virtual destructor of %qD final " | |
3068 | "would enable devirtualization of %i call " | |
3069 | "executed %lli times", | |
3070 | "Declaring virtual destructor of %qD final " | |
3071 | "would enable devirtualization of %i calls " | |
3072 | "executed %lli times", | |
3073 | DECL_CONTEXT (decl), count, dyn_count); | |
3074 | else | |
3075 | warning_n (DECL_SOURCE_LOCATION (decl), | |
3076 | OPT_Wsuggest_final_methods, count, | |
3077 | "Declaring method %qD final " | |
3078 | "would enable devirtualization of %i call " | |
3079 | "executed %lli times", | |
3080 | "Declaring method %qD final " | |
3081 | "would enable devirtualization of %i calls " | |
3082 | "executed %lli times", | |
3083 | decl, count, dyn_count); | |
91bc34a9 JH |
3084 | } |
3085 | } | |
3086 | ||
3087 | delete (final_warning_records); | |
3088 | final_warning_records = 0; | |
3089 | } | |
bbc9396b JH |
3090 | |
3091 | if (dump_file) | |
3092 | fprintf (dump_file, | |
3093 | "%i polymorphic calls, %i devirtualized," | |
3094 | " %i speculatively devirtualized, %i cold\n" | |
3095 | "%i have multiple targets, %i overwritable," | |
3096 | " %i already speculated (%i agree, %i disagree)," | |
570215f9 | 3097 | " %i external, %i not defined, %i artificial\n", |
bbc9396b JH |
3098 | npolymorphic, ndevirtualized, nconverted, ncold, |
3099 | nmultiple, noverwritable, nspeculated, nok, nwrong, | |
570215f9 | 3100 | nexternal, nnotdefined, nartificial); |
bbc9396b JH |
3101 | return ndevirtualized ? TODO_remove_functions : 0; |
3102 | } | |
3103 | ||
bbc9396b JH |
3104 | namespace { |
3105 | ||
3106 | const pass_data pass_data_ipa_devirt = | |
3107 | { | |
3108 | IPA_PASS, /* type */ | |
3109 | "devirt", /* name */ | |
3110 | OPTGROUP_NONE, /* optinfo_flags */ | |
bbc9396b JH |
3111 | TV_IPA_DEVIRT, /* tv_id */ |
3112 | 0, /* properties_required */ | |
3113 | 0, /* properties_provided */ | |
3114 | 0, /* properties_destroyed */ | |
3115 | 0, /* todo_flags_start */ | |
3116 | ( TODO_dump_symtab ), /* todo_flags_finish */ | |
3117 | }; | |
3118 | ||
3119 | class pass_ipa_devirt : public ipa_opt_pass_d | |
3120 | { | |
3121 | public: | |
c3284718 RS |
3122 | pass_ipa_devirt (gcc::context *ctxt) |
3123 | : ipa_opt_pass_d (pass_data_ipa_devirt, ctxt, | |
3124 | NULL, /* generate_summary */ | |
3125 | NULL, /* write_summary */ | |
3126 | NULL, /* read_summary */ | |
3127 | NULL, /* write_optimization_summary */ | |
3128 | NULL, /* read_optimization_summary */ | |
3129 | NULL, /* stmt_fixup */ | |
3130 | 0, /* function_transform_todo_flags_start */ | |
3131 | NULL, /* function_transform */ | |
3132 | NULL) /* variable_transform */ | |
bbc9396b JH |
3133 | {} |
3134 | ||
3135 | /* opt_pass methods: */ | |
1a3d085c TS |
3136 | virtual bool gate (function *) |
3137 | { | |
2bf86c84 JH |
3138 | /* In LTO, always run the IPA passes and decide on function basis if the |
3139 | pass is enabled. */ | |
3140 | if (in_lto_p) | |
3141 | return true; | |
1a3d085c | 3142 | return (flag_devirtualize |
91bc34a9 JH |
3143 | && (flag_devirtualize_speculatively |
3144 | || (warn_suggest_final_methods | |
3145 | || warn_suggest_final_types)) | |
1a3d085c TS |
3146 | && optimize); |
3147 | } | |
3148 | ||
be55bfe6 | 3149 | virtual unsigned int execute (function *) { return ipa_devirt (); } |
bbc9396b JH |
3150 | |
3151 | }; // class pass_ipa_devirt | |
3152 | ||
3153 | } // anon namespace | |
3154 | ||
3155 | ipa_opt_pass_d * | |
3156 | make_pass_ipa_devirt (gcc::context *ctxt) | |
3157 | { | |
3158 | return new pass_ipa_devirt (ctxt); | |
3159 | } | |
3160 | ||
eefe9a99 | 3161 | #include "gt-ipa-devirt.h" |