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b84d4347 | 1 | /* Interprocedural semantic function equality pass |
8d9254fc | 2 | Copyright (C) 2014-2020 Free Software Foundation, Inc. |
b84d4347 ML |
3 | |
4 | Contributed by Jan Hubicka <hubicka@ucw.cz> and Martin Liska <mliska@suse.cz> | |
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 | ||
22 | namespace ipa_icf { | |
23 | class sem_item; | |
24 | ||
25 | /* Congruence class encompasses a collection of either functions or | |
26 | read-only variables. These items are considered to be equivalent | |
956d615d | 27 | if not proved the opposite. */ |
b84d4347 ML |
28 | class congruence_class |
29 | { | |
30 | public: | |
31 | /* Congruence class constructor for a new class with _ID. */ | |
c3af5442 ML |
32 | congruence_class (unsigned int _id): in_worklist (false), id (_id), |
33 | referenced_by_count (0) | |
b84d4347 ML |
34 | { |
35 | } | |
36 | ||
37 | /* Destructor. */ | |
38 | ~congruence_class () | |
39 | { | |
40 | } | |
41 | ||
42 | /* Dump function prints all class members to a FILE with an INDENT. */ | |
43 | void dump (FILE *file, unsigned int indent = 0) const; | |
44 | ||
45 | /* Returns true if there's a member that is used from another group. */ | |
46 | bool is_class_used (void); | |
47 | ||
48 | /* Flag is used in case we want to remove a class from worklist and | |
49 | delete operation is quite expensive for | |
50 | the data structure (linked list). */ | |
51 | bool in_worklist; | |
52 | ||
53 | /* Vector of all group members. */ | |
54 | auto_vec <sem_item *> members; | |
55 | ||
56 | /* Global unique class identifier. */ | |
57 | unsigned int id; | |
c3af5442 ML |
58 | |
59 | /* Total number of references to items of this class. */ | |
60 | unsigned referenced_by_count; | |
b84d4347 ML |
61 | }; |
62 | ||
63 | /* Semantic item type enum. */ | |
64 | enum sem_item_type | |
65 | { | |
66 | FUNC, | |
67 | VAR | |
68 | }; | |
69 | ||
5ebd0e61 ML |
70 | /* Class is container for address references for a symtab_node. */ |
71 | ||
72 | class symbol_compare_collection | |
73 | { | |
74 | public: | |
75 | /* Constructor. */ | |
76 | symbol_compare_collection (symtab_node *node); | |
77 | ||
78 | /* Destructor. */ | |
79 | ~symbol_compare_collection () | |
80 | { | |
81 | m_references.release (); | |
82 | m_interposables.release (); | |
83 | } | |
84 | ||
85 | /* Vector of address references. */ | |
86 | vec<symtab_node *> m_references; | |
87 | ||
88 | /* Vector of interposable references. */ | |
89 | vec<symtab_node *> m_interposables; | |
90 | }; | |
91 | ||
92 | /* Hash traits for symbol_compare_collection map. */ | |
93 | ||
9654754b | 94 | struct symbol_compare_hash : nofree_ptr_hash <symbol_compare_collection> |
5ebd0e61 ML |
95 | { |
96 | static hashval_t | |
9654754b | 97 | hash (value_type v) |
5ebd0e61 ML |
98 | { |
99 | inchash::hash hstate; | |
100 | hstate.add_int (v->m_references.length ()); | |
101 | ||
102 | for (unsigned i = 0; i < v->m_references.length (); i++) | |
69f6b1f4 | 103 | hstate.add_int (v->m_references[i]->ultimate_alias_target ()->order); |
5ebd0e61 ML |
104 | |
105 | hstate.add_int (v->m_interposables.length ()); | |
106 | ||
107 | for (unsigned i = 0; i < v->m_interposables.length (); i++) | |
69f6b1f4 | 108 | hstate.add_int (v->m_interposables[i]->ultimate_alias_target ()->order); |
5ebd0e61 ML |
109 | |
110 | return hstate.end (); | |
111 | } | |
112 | ||
113 | static bool | |
9654754b | 114 | equal (value_type a, value_type b) |
5ebd0e61 | 115 | { |
b94097dc ML |
116 | if (a->m_references.length () != b->m_references.length () |
117 | || a->m_interposables.length () != b->m_interposables.length ()) | |
5ebd0e61 ML |
118 | return false; |
119 | ||
120 | for (unsigned i = 0; i < a->m_references.length (); i++) | |
121 | if (a->m_references[i]->equal_address_to (b->m_references[i]) != 1) | |
122 | return false; | |
123 | ||
124 | for (unsigned i = 0; i < a->m_interposables.length (); i++) | |
125 | if (!a->m_interposables[i]->semantically_equivalent_p | |
126 | (b->m_interposables[i])) | |
127 | return false; | |
128 | ||
129 | return true; | |
130 | } | |
131 | }; | |
132 | ||
b84d4347 ML |
133 | /* Semantic item usage pair. */ |
134 | class sem_usage_pair | |
135 | { | |
136 | public: | |
137 | /* Constructor for key value pair, where _ITEM is key and _INDEX is a target. */ | |
138 | sem_usage_pair (sem_item *_item, unsigned int _index); | |
139 | ||
140 | /* Target semantic item where an item is used. */ | |
141 | sem_item *item; | |
142 | ||
143 | /* Index of usage of such an item. */ | |
144 | unsigned int index; | |
145 | }; | |
146 | ||
a9fae4b4 ML |
147 | struct sem_usage_pair_hash : pointer_hash <sem_usage_pair> |
148 | { | |
149 | static inline hashval_t hash (sem_usage_pair *); | |
150 | static inline bool equal (sem_usage_pair *, sem_usage_pair *); | |
151 | }; | |
152 | ||
153 | inline hashval_t | |
154 | sem_usage_pair_hash::hash (sem_usage_pair *pair) | |
155 | { | |
156 | inchash::hash hstate; | |
157 | ||
158 | hstate.add_ptr (pair->item); | |
159 | hstate.add_int (pair->index); | |
160 | ||
161 | return hstate.end (); | |
162 | } | |
163 | ||
164 | inline bool | |
165 | sem_usage_pair_hash::equal (sem_usage_pair *p1, sem_usage_pair *p2) | |
166 | { | |
167 | return p1->item == p2->item && p1->index == p2->index; | |
168 | } | |
169 | ||
170 | struct sem_usage_hash : sem_usage_pair_hash, typed_delete_remove <sem_usage_pair> {}; | |
171 | typedef hash_map<sem_usage_hash, auto_vec<sem_item *> > ref_map; | |
172 | ||
0dbacfcf ML |
173 | typedef std::pair<symtab_node *, symtab_node *> symtab_pair; |
174 | ||
b84d4347 ML |
175 | /* Semantic item is a base class that encapsulates all shared functionality |
176 | for both semantic function and variable items. */ | |
177 | class sem_item | |
178 | { | |
179 | public: | |
180 | /* Semantic item constructor for a node of _TYPE, where STACK is used | |
181 | for bitmap memory allocation. */ | |
182 | sem_item (sem_item_type _type, bitmap_obstack *stack); | |
183 | ||
184 | /* Semantic item constructor for a node of _TYPE, where STACK is used | |
fedf2718 ML |
185 | for bitmap memory allocation. The item is based on symtab node _NODE. */ |
186 | sem_item (sem_item_type _type, symtab_node *_node, bitmap_obstack *stack); | |
b84d4347 ML |
187 | |
188 | virtual ~sem_item (); | |
189 | ||
190 | /* Dump function for debugging purpose. */ | |
191 | DEBUG_FUNCTION void dump (void); | |
192 | ||
b84d4347 | 193 | /* Semantic item initialization function. */ |
a37f58f5 | 194 | virtual void init (ipa_icf_gimple::func_checker *) = 0; |
b84d4347 ML |
195 | |
196 | /* Add reference to a semantic TARGET. */ | |
a9fae4b4 | 197 | void add_reference (ref_map *map, sem_item *target); |
b84d4347 | 198 | |
b84d4347 ML |
199 | /* Fast equality function based on knowledge known in WPA. */ |
200 | virtual bool equals_wpa (sem_item *item, | |
201 | hash_map <symtab_node *, sem_item *> &ignored_nodes) = 0; | |
202 | ||
956d615d | 203 | /* Returns true if the item equals to ITEM given as argument. */ |
b84d4347 ML |
204 | virtual bool equals (sem_item *item, |
205 | hash_map <symtab_node *, sem_item *> &ignored_nodes) = 0; | |
206 | ||
207 | /* References independent hash function. */ | |
208 | virtual hashval_t get_hash (void) = 0; | |
209 | ||
808b6bb7 ML |
210 | /* Set new hash value of the item. */ |
211 | void set_hash (hashval_t hash); | |
212 | ||
b84d4347 ML |
213 | /* Merges instance with an ALIAS_ITEM, where alias, thunk or redirection can |
214 | be applied. */ | |
215 | virtual bool merge (sem_item *alias_item) = 0; | |
216 | ||
217 | /* Dump symbol to FILE. */ | |
218 | virtual void dump_to_file (FILE *file) = 0; | |
219 | ||
3ab93359 ML |
220 | /* Update hash by address sensitive references. */ |
221 | void update_hash_by_addr_refs (hash_map <symtab_node *, | |
222 | sem_item *> &m_symtab_node_map); | |
223 | ||
224 | /* Update hash by computed local hash values taken from different | |
225 | semantic items. */ | |
226 | void update_hash_by_local_refs (hash_map <symtab_node *, | |
227 | sem_item *> &m_symtab_node_map); | |
228 | ||
b84d4347 ML |
229 | /* Return base tree that can be used for compatible_types_p and |
230 | contains_polymorphic_type_p comparison. */ | |
b84d4347 ML |
231 | static bool get_base_types (tree *t1, tree *t2); |
232 | ||
f657d665 ML |
233 | /* Return true if target supports alias symbols. */ |
234 | bool target_supports_symbol_aliases_p (void); | |
235 | ||
b84d4347 ML |
236 | /* Item type. */ |
237 | sem_item_type type; | |
238 | ||
239 | /* Symtab node. */ | |
240 | symtab_node *node; | |
241 | ||
242 | /* Declaration tree node. */ | |
243 | tree decl; | |
244 | ||
a9fae4b4 ML |
245 | /* Number of references to a semantic symbols (function calls, |
246 | variable references). */ | |
247 | unsigned reference_count; | |
b84d4347 ML |
248 | |
249 | /* Pointer to a congruence class the item belongs to. */ | |
250 | congruence_class *cls; | |
251 | ||
252 | /* Index of the item in a class belonging to. */ | |
253 | unsigned int index_in_class; | |
254 | ||
b84d4347 ML |
255 | /* A bitmap with indices of all classes referencing this item. */ |
256 | bitmap usage_index_bitmap; | |
257 | ||
258 | /* List of tree references (either FUNC_DECL or VAR_DECL). */ | |
259 | vec <tree> tree_refs; | |
260 | ||
261 | /* A set with symbol table references. */ | |
262 | hash_set <symtab_node *> refs_set; | |
263 | ||
3ab93359 ML |
264 | /* Temporary hash used where hash values of references are added. */ |
265 | hashval_t global_hash; | |
a9fae4b4 ML |
266 | |
267 | /* Number of references to this symbol. */ | |
268 | unsigned referenced_by_count; | |
b84d4347 ML |
269 | protected: |
270 | /* Cached, once calculated hash for the item. */ | |
46305737 | 271 | |
977b01e3 JH |
272 | /* Compare properties of symbol that does not affect semantics of symbol |
273 | itself but affects semantics of its references. | |
274 | If ADDRESS is true, do extra checking needed for IPA_REF_ADDR. */ | |
275 | static bool compare_referenced_symbol_properties (symtab_node *used_by, | |
276 | symtab_node *n1, | |
277 | symtab_node *n2, | |
278 | bool address); | |
279 | ||
280 | /* Hash properties compared by compare_referenced_symbol_properties. */ | |
281 | void hash_referenced_symbol_properties (symtab_node *ref, | |
282 | inchash::hash &hstate, | |
283 | bool address); | |
284 | ||
46305737 JH |
285 | /* For a given symbol table nodes N1 and N2, we check that FUNCTION_DECLs |
286 | point to a same function. Comparison can be skipped if IGNORED_NODES | |
287 | contains these nodes. ADDRESS indicate if address is taken. */ | |
977b01e3 | 288 | bool compare_symbol_references (hash_map <symtab_node *, sem_item *> |
46305737 JH |
289 | &ignored_nodes, |
290 | symtab_node *n1, symtab_node *n2, | |
291 | bool address); | |
808b6bb7 ML |
292 | protected: |
293 | /* Hash of item. */ | |
294 | hashval_t m_hash; | |
46305737 | 295 | |
fedf2718 ML |
296 | /* Indicated whether a hash value has been set or not. */ |
297 | bool m_hash_set; | |
298 | ||
b84d4347 ML |
299 | private: |
300 | /* Initialize internal data structures. Bitmap STACK is used for | |
301 | bitmap memory allocation process. */ | |
302 | void setup (bitmap_obstack *stack); | |
6c72e55d ML |
303 | |
304 | /* Because types can be arbitrarily large, avoid quadratic bottleneck. */ | |
305 | static hash_map<const_tree, hashval_t> m_type_hash_cache; | |
b84d4347 ML |
306 | }; // class sem_item |
307 | ||
308 | class sem_function: public sem_item | |
309 | { | |
310 | public: | |
311 | /* Semantic function constructor that uses STACK as bitmap memory stack. */ | |
312 | sem_function (bitmap_obstack *stack); | |
313 | ||
fedf2718 | 314 | /* Constructor based on callgraph node _NODE. |
b84d4347 | 315 | Bitmap STACK is used for memory allocation. */ |
fedf2718 | 316 | sem_function (cgraph_node *_node, bitmap_obstack *stack); |
b84d4347 ML |
317 | |
318 | ~sem_function (); | |
319 | ||
a37f58f5 | 320 | virtual void init (ipa_icf_gimple::func_checker *); |
b84d4347 ML |
321 | virtual bool equals_wpa (sem_item *item, |
322 | hash_map <symtab_node *, sem_item *> &ignored_nodes); | |
323 | virtual hashval_t get_hash (void); | |
324 | virtual bool equals (sem_item *item, | |
325 | hash_map <symtab_node *, sem_item *> &ignored_nodes); | |
326 | virtual bool merge (sem_item *alias_item); | |
327 | ||
328 | /* Dump symbol to FILE. */ | |
329 | virtual void dump_to_file (FILE *file) | |
330 | { | |
331 | gcc_assert (file); | |
332 | dump_function_to_file (decl, file, TDF_DETAILS); | |
333 | } | |
334 | ||
b84d4347 ML |
335 | /* Returns cgraph_node. */ |
336 | inline cgraph_node *get_node (void) | |
337 | { | |
338 | return dyn_cast <cgraph_node *> (node); | |
339 | } | |
340 | ||
341 | /* Improve accumulated hash for HSTATE based on a gimple statement STMT. */ | |
355fe088 | 342 | void hash_stmt (gimple *stmt, inchash::hash &inchash); |
b84d4347 ML |
343 | |
344 | /* Return true if polymorphic comparison must be processed. */ | |
345 | bool compare_polymorphic_p (void); | |
346 | ||
347 | /* For a given call graph NODE, the function constructs new | |
348 | semantic function item. */ | |
a37f58f5 ML |
349 | static sem_function *parse (cgraph_node *node, bitmap_obstack *stack, |
350 | ipa_icf_gimple::func_checker *checker); | |
b84d4347 | 351 | |
1628e36b | 352 | /* Perform additional checks needed to match types of used function |
956d615d | 353 | parameters. */ |
1628e36b JH |
354 | bool compatible_parm_types_p (tree, tree); |
355 | ||
b84d4347 ML |
356 | /* Exception handling region tree. */ |
357 | eh_region region_tree; | |
358 | ||
b84d4347 ML |
359 | /* Number of function arguments. */ |
360 | unsigned int arg_count; | |
361 | ||
362 | /* Total amount of edges in the function. */ | |
363 | unsigned int edge_count; | |
364 | ||
365 | /* Vector of sizes of all basic blocks. */ | |
366 | vec <unsigned int> bb_sizes; | |
367 | ||
368 | /* Control flow graph checksum. */ | |
369 | hashval_t cfg_checksum; | |
370 | ||
371 | /* GIMPLE codes hash value. */ | |
372 | hashval_t gcode_hash; | |
373 | ||
374 | /* Total number of SSA names used in the function. */ | |
375 | unsigned ssa_names_size; | |
376 | ||
377 | /* Array of structures for all basic blocks. */ | |
378 | vec <ipa_icf_gimple::sem_bb *> bb_sorted; | |
b3587b99 JH |
379 | |
380 | /* Return true if parameter I may be used. */ | |
381 | bool param_used_p (unsigned int i); | |
b84d4347 ML |
382 | |
383 | private: | |
384 | /* Calculates hash value based on a BASIC_BLOCK. */ | |
385 | hashval_t get_bb_hash (const ipa_icf_gimple::sem_bb *basic_block); | |
386 | ||
387 | /* For given basic blocks BB1 and BB2 (from functions FUNC1 and FUNC), | |
388 | true value is returned if phi nodes are semantically | |
389 | equivalent in these blocks . */ | |
390 | bool compare_phi_node (basic_block bb1, basic_block bb2); | |
391 | ||
392 | /* Basic blocks dictionary BB_DICT returns true if SOURCE index BB | |
393 | corresponds to TARGET. */ | |
1216ea72 | 394 | bool bb_dict_test (vec<int> *bb_dict, int source, int target); |
b84d4347 | 395 | |
b84d4347 ML |
396 | /* If cgraph edges E1 and E2 are indirect calls, verify that |
397 | ICF flags are the same. */ | |
398 | bool compare_edge_flags (cgraph_edge *e1, cgraph_edge *e2); | |
399 | ||
b84d4347 | 400 | /* Processes function equality comparison. */ |
fb5c322e | 401 | bool equals_private (sem_item *item); |
b84d4347 | 402 | |
b84d4347 ML |
403 | /* Function checker stores binding between functions. */ |
404 | ipa_icf_gimple::func_checker *m_checker; | |
405 | ||
406 | /* COMPARED_FUNC is a function that we compare to. */ | |
407 | sem_function *m_compared_func; | |
408 | }; // class sem_function | |
409 | ||
410 | class sem_variable: public sem_item | |
411 | { | |
412 | public: | |
413 | /* Semantic variable constructor that uses STACK as bitmap memory stack. */ | |
414 | sem_variable (bitmap_obstack *stack); | |
415 | ||
fedf2718 | 416 | /* Constructor based on callgraph node _NODE. |
b84d4347 ML |
417 | Bitmap STACK is used for memory allocation. */ |
418 | ||
fedf2718 | 419 | sem_variable (varpool_node *_node, bitmap_obstack *stack); |
b84d4347 | 420 | |
b84d4347 | 421 | /* Semantic variable initialization function. */ |
a37f58f5 | 422 | virtual void init (ipa_icf_gimple::func_checker *); |
b84d4347 ML |
423 | |
424 | virtual hashval_t get_hash (void); | |
425 | virtual bool merge (sem_item *alias_item); | |
426 | virtual void dump_to_file (FILE *file); | |
427 | virtual bool equals (sem_item *item, | |
428 | hash_map <symtab_node *, sem_item *> &ignored_nodes); | |
429 | ||
430 | /* Fast equality variable based on knowledge known in WPA. */ | |
46305737 JH |
431 | virtual bool equals_wpa (sem_item *item, |
432 | hash_map <symtab_node *, sem_item *> &ignored_nodes); | |
b84d4347 ML |
433 | |
434 | /* Returns varpool_node. */ | |
435 | inline varpool_node *get_node (void) | |
436 | { | |
437 | return dyn_cast <varpool_node *> (node); | |
438 | } | |
439 | ||
440 | /* Parser function that visits a varpool NODE. */ | |
a37f58f5 ML |
441 | static sem_variable *parse (varpool_node *node, bitmap_obstack *stack, |
442 | ipa_icf_gimple::func_checker *checker); | |
b84d4347 | 443 | |
b84d4347 | 444 | private: |
b84d4347 ML |
445 | /* Compares trees T1 and T2 for semantic equality. */ |
446 | static bool equals (tree t1, tree t2); | |
b84d4347 ML |
447 | }; // class sem_variable |
448 | ||
449 | class sem_item_optimizer; | |
450 | ||
451 | struct congruence_class_group | |
452 | { | |
453 | hashval_t hash; | |
454 | sem_item_type type; | |
455 | vec <congruence_class *> classes; | |
456 | }; | |
457 | ||
458 | /* Congruence class set structure. */ | |
3746a4b2 | 459 | struct congruence_class_hash : nofree_ptr_hash <congruence_class_group> |
b84d4347 | 460 | { |
67f58944 | 461 | static inline hashval_t hash (const congruence_class_group *item) |
b84d4347 ML |
462 | { |
463 | return item->hash; | |
464 | } | |
465 | ||
67f58944 TS |
466 | static inline int equal (const congruence_class_group *item1, |
467 | const congruence_class_group *item2) | |
b84d4347 ML |
468 | { |
469 | return item1->hash == item2->hash && item1->type == item2->type; | |
470 | } | |
471 | }; | |
472 | ||
473 | struct traverse_split_pair | |
474 | { | |
475 | sem_item_optimizer *optimizer; | |
476 | class congruence_class *cls; | |
477 | }; | |
478 | ||
479 | /* Semantic item optimizer includes all top-level logic | |
480 | related to semantic equality comparison. */ | |
481 | class sem_item_optimizer | |
482 | { | |
483 | public: | |
484 | sem_item_optimizer (); | |
485 | ~sem_item_optimizer (); | |
486 | ||
487 | /* Function responsible for visiting all potential functions and | |
488 | read-only variables that can be merged. */ | |
489 | void parse_funcs_and_vars (void); | |
490 | ||
bd31fe14 ML |
491 | /* Optimizer entry point which returns true in case it processes |
492 | a merge operation. True is returned if there's a merge operation | |
493 | processed. */ | |
494 | bool execute (void); | |
b84d4347 ML |
495 | |
496 | /* Dump function. */ | |
497 | void dump (void); | |
498 | ||
499 | /* Verify congruence classes if checking is enabled. */ | |
b2b29377 MM |
500 | void checking_verify_classes (void); |
501 | ||
502 | /* Verify congruence classes. */ | |
b84d4347 ML |
503 | void verify_classes (void); |
504 | ||
505 | /* Write IPA ICF summary for symbols. */ | |
506 | void write_summary (void); | |
507 | ||
026c3cfd | 508 | /* Read IPA ICF summary for symbols. */ |
b84d4347 ML |
509 | void read_summary (void); |
510 | ||
511 | /* Callgraph removal hook called for a NODE with a custom DATA. */ | |
512 | static void cgraph_removal_hook (cgraph_node *node, void *data); | |
513 | ||
514 | /* Varpool removal hook called for a NODE with a custom DATA. */ | |
515 | static void varpool_removal_hook (varpool_node *node, void *data); | |
516 | ||
517 | /* Worklist of congruence classes that can potentially | |
518 | refine classes of congruence. */ | |
c3af5442 | 519 | fibonacci_heap<unsigned, congruence_class> worklist; |
b84d4347 ML |
520 | |
521 | /* Remove semantic ITEM and release memory. */ | |
522 | void remove_item (sem_item *item); | |
523 | ||
524 | /* Remove symtab NODE triggered by symtab removal hooks. */ | |
525 | void remove_symtab_node (symtab_node *node); | |
526 | ||
527 | /* Register callgraph and varpool hooks. */ | |
528 | void register_hooks (void); | |
529 | ||
530 | /* Unregister callgraph and varpool hooks. */ | |
531 | void unregister_hooks (void); | |
532 | ||
533 | /* Adds a CLS to hashtable associated by hash value. */ | |
534 | void add_class (congruence_class *cls); | |
535 | ||
536 | /* Gets a congruence class group based on given HASH value and TYPE. */ | |
537 | congruence_class_group *get_group_by_hash (hashval_t hash, | |
538 | sem_item_type type); | |
b84d4347 ML |
539 | private: |
540 | ||
3ab93359 ML |
541 | /* For each semantic item, append hash values of references. */ |
542 | void update_hash_by_addr_refs (); | |
543 | ||
b84d4347 ML |
544 | /* Congruence classes are built by hash value. */ |
545 | void build_hash_based_classes (void); | |
546 | ||
547 | /* Semantic items in classes having more than one element and initialized. | |
548 | In case of WPA, we load function body. */ | |
5d97670f | 549 | unsigned int parse_nonsingleton_classes (void); |
b84d4347 ML |
550 | |
551 | /* Equality function for semantic items is used to subdivide existing | |
552 | classes. If IN_WPA, fast equality function is invoked. */ | |
553 | void subdivide_classes_by_equality (bool in_wpa = false); | |
554 | ||
5ebd0e61 ML |
555 | /* Subdivide classes by address and interposable references |
556 | that members of the class reference. | |
557 | Example can be a pair of functions that have an address | |
558 | taken from a function. If these addresses are different the class | |
559 | is split. */ | |
560 | unsigned subdivide_classes_by_sensitive_refs(); | |
561 | ||
b84d4347 ML |
562 | /* Debug function prints all informations about congruence classes. */ |
563 | void dump_cong_classes (void); | |
564 | ||
565 | /* Build references according to call graph. */ | |
566 | void build_graph (void); | |
567 | ||
568 | /* Iterative congruence reduction function. */ | |
569 | void process_cong_reduction (void); | |
570 | ||
571 | /* After reduction is done, we can declare all items in a group | |
572 | to be equal. PREV_CLASS_COUNT is start number of classes | |
bd31fe14 | 573 | before reduction. True is returned if there's a merge operation |
5d97670f ML |
574 | processed. LOADED_SYMBOLS is number of symbols that were loaded |
575 | in WPA. */ | |
576 | bool merge_classes (unsigned int prev_class_count, | |
577 | unsigned int loaded_symbols); | |
b84d4347 | 578 | |
0dbacfcf ML |
579 | /* Fixup points to analysis info. */ |
580 | void fixup_points_to_sets (void); | |
581 | ||
582 | /* Fixup points to set PT. */ | |
583 | void fixup_pt_set (struct pt_solution *pt); | |
584 | ||
b84d4347 ML |
585 | /* Adds a newly created congruence class CLS to worklist. */ |
586 | void worklist_push (congruence_class *cls); | |
587 | ||
588 | /* Pops a class from worklist. */ | |
589 | congruence_class *worklist_pop (); | |
590 | ||
591 | /* Every usage of a congruence class CLS is a candidate that can split the | |
592 | collection of classes. Bitmap stack BMSTACK is used for bitmap | |
593 | allocation. */ | |
594 | void do_congruence_step (congruence_class *cls); | |
595 | ||
596 | /* Tests if a class CLS used as INDEXth splits any congruence classes. | |
597 | Bitmap stack BMSTACK is used for bitmap allocation. */ | |
a9fae4b4 | 598 | bool do_congruence_step_for_index (congruence_class *cls, unsigned int index); |
b84d4347 ML |
599 | |
600 | /* Makes pairing between a congruence class CLS and semantic ITEM. */ | |
601 | static void add_item_to_class (congruence_class *cls, sem_item *item); | |
602 | ||
603 | /* Disposes split map traverse function. CLS is congruence | |
604 | class, BSLOT is bitmap slot we want to release. DATA is mandatory, | |
605 | but unused argument. */ | |
606 | static bool release_split_map (congruence_class * const &cls, bitmap const &b, | |
607 | traverse_split_pair *pair); | |
608 | ||
956d615d | 609 | /* Process split operation for a congruence class CLS, |
b84d4347 ML |
610 | where bitmap B splits congruence class members. DATA is used |
611 | as argument of split pair. */ | |
612 | static bool traverse_congruence_split (congruence_class * const &cls, | |
613 | bitmap const &b, | |
614 | traverse_split_pair *pair); | |
615 | ||
9e1f4e00 RB |
616 | /* Compare function for sorting pairs in do_congruence_step_f. */ |
617 | static int sort_congruence_split (const void *, const void *); | |
618 | ||
b84d4347 ML |
619 | /* Reads a section from LTO stream file FILE_DATA. Input block for DATA |
620 | contains LEN bytes. */ | |
621 | void read_section (lto_file_decl_data *file_data, const char *data, | |
622 | size_t len); | |
623 | ||
624 | /* Removes all callgraph and varpool nodes that are marked by symtab | |
625 | as deleted. */ | |
626 | void filter_removed_items (void); | |
627 | ||
628 | /* Vector of semantic items. */ | |
629 | vec <sem_item *> m_items; | |
630 | ||
631 | /* A set containing all items removed by hooks. */ | |
632 | hash_set <symtab_node *> m_removed_items_set; | |
633 | ||
df8391b4 | 634 | /* Hashtable of congruence classes. */ |
3746a4b2 | 635 | hash_table <congruence_class_hash> m_classes; |
df8391b4 | 636 | |
b84d4347 ML |
637 | /* Count of congruence classes. */ |
638 | unsigned int m_classes_count; | |
639 | ||
640 | /* Map data structure maps symtab nodes to semantic items. */ | |
641 | hash_map <symtab_node *, sem_item *> m_symtab_node_map; | |
642 | ||
643 | /* Set to true if a splitter class is removed. */ | |
644 | bool splitter_class_removed; | |
645 | ||
646 | /* Global unique class id counter. */ | |
647 | static unsigned int class_id; | |
648 | ||
649 | /* Callgraph node removal hook holder. */ | |
650 | cgraph_node_hook_list *m_cgraph_node_hooks; | |
651 | ||
652 | /* Varpool node removal hook holder. */ | |
653 | varpool_node_hook_list *m_varpool_node_hooks; | |
654 | ||
655 | /* Bitmap stack. */ | |
656 | bitmap_obstack m_bmstack; | |
0dbacfcf ML |
657 | |
658 | /* Vector of merged variables. Needed for fixup of points-to-analysis | |
659 | info. */ | |
660 | vec <symtab_pair> m_merged_variables; | |
a9fae4b4 ML |
661 | |
662 | /* Hash map will all references. */ | |
663 | ref_map m_references; | |
b84d4347 ML |
664 | }; // class sem_item_optimizer |
665 | ||
666 | } // ipa_icf namespace |