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b84d4347 | 1 | /* Interprocedural semantic function equality pass |
85ec4feb | 2 | Copyright (C) 2014-2018 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 | |
27 | if not proved the oposite. */ | |
28 | class congruence_class | |
29 | { | |
30 | public: | |
31 | /* Congruence class constructor for a new class with _ID. */ | |
32 | congruence_class (unsigned int _id): in_worklist (false), id(_id) | |
33 | { | |
34 | } | |
35 | ||
36 | /* Destructor. */ | |
37 | ~congruence_class () | |
38 | { | |
39 | } | |
40 | ||
41 | /* Dump function prints all class members to a FILE with an INDENT. */ | |
42 | void dump (FILE *file, unsigned int indent = 0) const; | |
43 | ||
44 | /* Returns true if there's a member that is used from another group. */ | |
45 | bool is_class_used (void); | |
46 | ||
47 | /* Flag is used in case we want to remove a class from worklist and | |
48 | delete operation is quite expensive for | |
49 | the data structure (linked list). */ | |
50 | bool in_worklist; | |
51 | ||
52 | /* Vector of all group members. */ | |
53 | auto_vec <sem_item *> members; | |
54 | ||
55 | /* Global unique class identifier. */ | |
56 | unsigned int id; | |
57 | }; | |
58 | ||
59 | /* Semantic item type enum. */ | |
60 | enum sem_item_type | |
61 | { | |
62 | FUNC, | |
63 | VAR | |
64 | }; | |
65 | ||
5ebd0e61 ML |
66 | /* Class is container for address references for a symtab_node. */ |
67 | ||
68 | class symbol_compare_collection | |
69 | { | |
70 | public: | |
71 | /* Constructor. */ | |
72 | symbol_compare_collection (symtab_node *node); | |
73 | ||
74 | /* Destructor. */ | |
75 | ~symbol_compare_collection () | |
76 | { | |
77 | m_references.release (); | |
78 | m_interposables.release (); | |
79 | } | |
80 | ||
81 | /* Vector of address references. */ | |
82 | vec<symtab_node *> m_references; | |
83 | ||
84 | /* Vector of interposable references. */ | |
85 | vec<symtab_node *> m_interposables; | |
86 | }; | |
87 | ||
88 | /* Hash traits for symbol_compare_collection map. */ | |
89 | ||
9654754b | 90 | struct symbol_compare_hash : nofree_ptr_hash <symbol_compare_collection> |
5ebd0e61 ML |
91 | { |
92 | static hashval_t | |
9654754b | 93 | hash (value_type v) |
5ebd0e61 ML |
94 | { |
95 | inchash::hash hstate; | |
96 | hstate.add_int (v->m_references.length ()); | |
97 | ||
98 | for (unsigned i = 0; i < v->m_references.length (); i++) | |
69f6b1f4 | 99 | hstate.add_int (v->m_references[i]->ultimate_alias_target ()->order); |
5ebd0e61 ML |
100 | |
101 | hstate.add_int (v->m_interposables.length ()); | |
102 | ||
103 | for (unsigned i = 0; i < v->m_interposables.length (); i++) | |
69f6b1f4 | 104 | hstate.add_int (v->m_interposables[i]->ultimate_alias_target ()->order); |
5ebd0e61 ML |
105 | |
106 | return hstate.end (); | |
107 | } | |
108 | ||
109 | static bool | |
9654754b | 110 | equal (value_type a, value_type b) |
5ebd0e61 | 111 | { |
b94097dc ML |
112 | if (a->m_references.length () != b->m_references.length () |
113 | || a->m_interposables.length () != b->m_interposables.length ()) | |
5ebd0e61 ML |
114 | return false; |
115 | ||
116 | for (unsigned i = 0; i < a->m_references.length (); i++) | |
117 | if (a->m_references[i]->equal_address_to (b->m_references[i]) != 1) | |
118 | return false; | |
119 | ||
120 | for (unsigned i = 0; i < a->m_interposables.length (); i++) | |
121 | if (!a->m_interposables[i]->semantically_equivalent_p | |
122 | (b->m_interposables[i])) | |
123 | return false; | |
124 | ||
125 | return true; | |
126 | } | |
127 | }; | |
128 | ||
129 | ||
b84d4347 ML |
130 | /* Semantic item usage pair. */ |
131 | class sem_usage_pair | |
132 | { | |
133 | public: | |
134 | /* Constructor for key value pair, where _ITEM is key and _INDEX is a target. */ | |
135 | sem_usage_pair (sem_item *_item, unsigned int _index); | |
136 | ||
137 | /* Target semantic item where an item is used. */ | |
138 | sem_item *item; | |
139 | ||
140 | /* Index of usage of such an item. */ | |
141 | unsigned int index; | |
142 | }; | |
143 | ||
144 | /* Semantic item is a base class that encapsulates all shared functionality | |
145 | for both semantic function and variable items. */ | |
146 | class sem_item | |
147 | { | |
148 | public: | |
149 | /* Semantic item constructor for a node of _TYPE, where STACK is used | |
150 | for bitmap memory allocation. */ | |
151 | sem_item (sem_item_type _type, bitmap_obstack *stack); | |
152 | ||
153 | /* Semantic item constructor for a node of _TYPE, where STACK is used | |
fedf2718 ML |
154 | for bitmap memory allocation. The item is based on symtab node _NODE. */ |
155 | sem_item (sem_item_type _type, symtab_node *_node, bitmap_obstack *stack); | |
b84d4347 ML |
156 | |
157 | virtual ~sem_item (); | |
158 | ||
159 | /* Dump function for debugging purpose. */ | |
160 | DEBUG_FUNCTION void dump (void); | |
161 | ||
162 | /* Initialize semantic item by info reachable during LTO WPA phase. */ | |
163 | virtual void init_wpa (void) = 0; | |
164 | ||
165 | /* Semantic item initialization function. */ | |
166 | virtual void init (void) = 0; | |
167 | ||
168 | /* Add reference to a semantic TARGET. */ | |
169 | void add_reference (sem_item *target); | |
170 | ||
b84d4347 ML |
171 | /* Fast equality function based on knowledge known in WPA. */ |
172 | virtual bool equals_wpa (sem_item *item, | |
173 | hash_map <symtab_node *, sem_item *> &ignored_nodes) = 0; | |
174 | ||
175 | /* Returns true if the item equals to ITEM given as arguemnt. */ | |
176 | virtual bool equals (sem_item *item, | |
177 | hash_map <symtab_node *, sem_item *> &ignored_nodes) = 0; | |
178 | ||
179 | /* References independent hash function. */ | |
180 | virtual hashval_t get_hash (void) = 0; | |
181 | ||
808b6bb7 ML |
182 | /* Set new hash value of the item. */ |
183 | void set_hash (hashval_t hash); | |
184 | ||
b84d4347 ML |
185 | /* Merges instance with an ALIAS_ITEM, where alias, thunk or redirection can |
186 | be applied. */ | |
187 | virtual bool merge (sem_item *alias_item) = 0; | |
188 | ||
189 | /* Dump symbol to FILE. */ | |
190 | virtual void dump_to_file (FILE *file) = 0; | |
191 | ||
3ab93359 ML |
192 | /* Update hash by address sensitive references. */ |
193 | void update_hash_by_addr_refs (hash_map <symtab_node *, | |
194 | sem_item *> &m_symtab_node_map); | |
195 | ||
196 | /* Update hash by computed local hash values taken from different | |
197 | semantic items. */ | |
198 | void update_hash_by_local_refs (hash_map <symtab_node *, | |
199 | sem_item *> &m_symtab_node_map); | |
200 | ||
b84d4347 ML |
201 | /* Return base tree that can be used for compatible_types_p and |
202 | contains_polymorphic_type_p comparison. */ | |
b84d4347 ML |
203 | static bool get_base_types (tree *t1, tree *t2); |
204 | ||
f657d665 ML |
205 | /* Return true if target supports alias symbols. */ |
206 | bool target_supports_symbol_aliases_p (void); | |
207 | ||
b84d4347 ML |
208 | /* Item type. */ |
209 | sem_item_type type; | |
210 | ||
211 | /* Symtab node. */ | |
212 | symtab_node *node; | |
213 | ||
214 | /* Declaration tree node. */ | |
215 | tree decl; | |
216 | ||
217 | /* Semantic references used that generate congruence groups. */ | |
218 | vec <sem_item *> refs; | |
219 | ||
220 | /* Pointer to a congruence class the item belongs to. */ | |
221 | congruence_class *cls; | |
222 | ||
223 | /* Index of the item in a class belonging to. */ | |
224 | unsigned int index_in_class; | |
225 | ||
226 | /* List of semantic items where the instance is used. */ | |
227 | vec <sem_usage_pair *> usages; | |
228 | ||
229 | /* A bitmap with indices of all classes referencing this item. */ | |
230 | bitmap usage_index_bitmap; | |
231 | ||
232 | /* List of tree references (either FUNC_DECL or VAR_DECL). */ | |
233 | vec <tree> tree_refs; | |
234 | ||
235 | /* A set with symbol table references. */ | |
236 | hash_set <symtab_node *> refs_set; | |
237 | ||
3ab93359 ML |
238 | /* Temporary hash used where hash values of references are added. */ |
239 | hashval_t global_hash; | |
b84d4347 ML |
240 | protected: |
241 | /* Cached, once calculated hash for the item. */ | |
46305737 | 242 | |
69f6b1f4 | 243 | /* Accumulate to HSTATE a hash of expression EXP. */ |
a8d93817 | 244 | static void add_expr (const_tree exp, inchash::hash &hstate); |
69f6b1f4 JH |
245 | /* Accumulate to HSTATE a hash of type T. */ |
246 | static void add_type (const_tree t, inchash::hash &hstate); | |
b84d4347 | 247 | |
977b01e3 JH |
248 | /* Compare properties of symbol that does not affect semantics of symbol |
249 | itself but affects semantics of its references. | |
250 | If ADDRESS is true, do extra checking needed for IPA_REF_ADDR. */ | |
251 | static bool compare_referenced_symbol_properties (symtab_node *used_by, | |
252 | symtab_node *n1, | |
253 | symtab_node *n2, | |
254 | bool address); | |
255 | ||
b3587b99 JH |
256 | /* Compare two attribute lists. */ |
257 | static bool compare_attributes (const_tree list1, const_tree list2); | |
258 | ||
977b01e3 JH |
259 | /* Hash properties compared by compare_referenced_symbol_properties. */ |
260 | void hash_referenced_symbol_properties (symtab_node *ref, | |
261 | inchash::hash &hstate, | |
262 | bool address); | |
263 | ||
46305737 JH |
264 | /* For a given symbol table nodes N1 and N2, we check that FUNCTION_DECLs |
265 | point to a same function. Comparison can be skipped if IGNORED_NODES | |
266 | contains these nodes. ADDRESS indicate if address is taken. */ | |
977b01e3 | 267 | bool compare_symbol_references (hash_map <symtab_node *, sem_item *> |
46305737 JH |
268 | &ignored_nodes, |
269 | symtab_node *n1, symtab_node *n2, | |
270 | bool address); | |
808b6bb7 ML |
271 | protected: |
272 | /* Hash of item. */ | |
273 | hashval_t m_hash; | |
46305737 | 274 | |
fedf2718 ML |
275 | /* Indicated whether a hash value has been set or not. */ |
276 | bool m_hash_set; | |
277 | ||
b84d4347 ML |
278 | private: |
279 | /* Initialize internal data structures. Bitmap STACK is used for | |
280 | bitmap memory allocation process. */ | |
281 | void setup (bitmap_obstack *stack); | |
282 | }; // class sem_item | |
283 | ||
284 | class sem_function: public sem_item | |
285 | { | |
286 | public: | |
287 | /* Semantic function constructor that uses STACK as bitmap memory stack. */ | |
288 | sem_function (bitmap_obstack *stack); | |
289 | ||
fedf2718 | 290 | /* Constructor based on callgraph node _NODE. |
b84d4347 | 291 | Bitmap STACK is used for memory allocation. */ |
fedf2718 | 292 | sem_function (cgraph_node *_node, bitmap_obstack *stack); |
b84d4347 ML |
293 | |
294 | ~sem_function (); | |
295 | ||
296 | inline virtual void init_wpa (void) | |
297 | { | |
b84d4347 ML |
298 | } |
299 | ||
300 | virtual void init (void); | |
301 | virtual bool equals_wpa (sem_item *item, | |
302 | hash_map <symtab_node *, sem_item *> &ignored_nodes); | |
303 | virtual hashval_t get_hash (void); | |
304 | virtual bool equals (sem_item *item, | |
305 | hash_map <symtab_node *, sem_item *> &ignored_nodes); | |
306 | virtual bool merge (sem_item *alias_item); | |
307 | ||
308 | /* Dump symbol to FILE. */ | |
309 | virtual void dump_to_file (FILE *file) | |
310 | { | |
311 | gcc_assert (file); | |
312 | dump_function_to_file (decl, file, TDF_DETAILS); | |
313 | } | |
314 | ||
b84d4347 ML |
315 | /* Returns cgraph_node. */ |
316 | inline cgraph_node *get_node (void) | |
317 | { | |
318 | return dyn_cast <cgraph_node *> (node); | |
319 | } | |
320 | ||
321 | /* Improve accumulated hash for HSTATE based on a gimple statement STMT. */ | |
355fe088 | 322 | void hash_stmt (gimple *stmt, inchash::hash &inchash); |
b84d4347 ML |
323 | |
324 | /* Return true if polymorphic comparison must be processed. */ | |
325 | bool compare_polymorphic_p (void); | |
326 | ||
327 | /* For a given call graph NODE, the function constructs new | |
328 | semantic function item. */ | |
329 | static sem_function *parse (cgraph_node *node, bitmap_obstack *stack); | |
330 | ||
1628e36b JH |
331 | /* Perform additional checks needed to match types of used function |
332 | paramters. */ | |
333 | bool compatible_parm_types_p (tree, tree); | |
334 | ||
b84d4347 ML |
335 | /* Exception handling region tree. */ |
336 | eh_region region_tree; | |
337 | ||
b84d4347 ML |
338 | /* Number of function arguments. */ |
339 | unsigned int arg_count; | |
340 | ||
341 | /* Total amount of edges in the function. */ | |
342 | unsigned int edge_count; | |
343 | ||
344 | /* Vector of sizes of all basic blocks. */ | |
345 | vec <unsigned int> bb_sizes; | |
346 | ||
347 | /* Control flow graph checksum. */ | |
348 | hashval_t cfg_checksum; | |
349 | ||
350 | /* GIMPLE codes hash value. */ | |
351 | hashval_t gcode_hash; | |
352 | ||
353 | /* Total number of SSA names used in the function. */ | |
354 | unsigned ssa_names_size; | |
355 | ||
356 | /* Array of structures for all basic blocks. */ | |
357 | vec <ipa_icf_gimple::sem_bb *> bb_sorted; | |
b3587b99 JH |
358 | |
359 | /* Return true if parameter I may be used. */ | |
360 | bool param_used_p (unsigned int i); | |
b84d4347 ML |
361 | |
362 | private: | |
363 | /* Calculates hash value based on a BASIC_BLOCK. */ | |
364 | hashval_t get_bb_hash (const ipa_icf_gimple::sem_bb *basic_block); | |
365 | ||
366 | /* For given basic blocks BB1 and BB2 (from functions FUNC1 and FUNC), | |
367 | true value is returned if phi nodes are semantically | |
368 | equivalent in these blocks . */ | |
369 | bool compare_phi_node (basic_block bb1, basic_block bb2); | |
370 | ||
371 | /* Basic blocks dictionary BB_DICT returns true if SOURCE index BB | |
372 | corresponds to TARGET. */ | |
1216ea72 | 373 | bool bb_dict_test (vec<int> *bb_dict, int source, int target); |
b84d4347 | 374 | |
b84d4347 ML |
375 | /* If cgraph edges E1 and E2 are indirect calls, verify that |
376 | ICF flags are the same. */ | |
377 | bool compare_edge_flags (cgraph_edge *e1, cgraph_edge *e2); | |
378 | ||
b84d4347 | 379 | /* Processes function equality comparison. */ |
fb5c322e | 380 | bool equals_private (sem_item *item); |
b84d4347 ML |
381 | |
382 | /* Returns true if tree T can be compared as a handled component. */ | |
383 | static bool icf_handled_component_p (tree t); | |
384 | ||
385 | /* Function checker stores binding between functions. */ | |
386 | ipa_icf_gimple::func_checker *m_checker; | |
387 | ||
388 | /* COMPARED_FUNC is a function that we compare to. */ | |
389 | sem_function *m_compared_func; | |
390 | }; // class sem_function | |
391 | ||
392 | class sem_variable: public sem_item | |
393 | { | |
394 | public: | |
395 | /* Semantic variable constructor that uses STACK as bitmap memory stack. */ | |
396 | sem_variable (bitmap_obstack *stack); | |
397 | ||
fedf2718 | 398 | /* Constructor based on callgraph node _NODE. |
b84d4347 ML |
399 | Bitmap STACK is used for memory allocation. */ |
400 | ||
fedf2718 | 401 | sem_variable (varpool_node *_node, bitmap_obstack *stack); |
b84d4347 ML |
402 | |
403 | inline virtual void init_wpa (void) {} | |
404 | ||
405 | /* Semantic variable initialization function. */ | |
406 | inline virtual void init (void) | |
407 | { | |
408 | decl = get_node ()->decl; | |
b84d4347 ML |
409 | } |
410 | ||
411 | virtual hashval_t get_hash (void); | |
412 | virtual bool merge (sem_item *alias_item); | |
413 | virtual void dump_to_file (FILE *file); | |
414 | virtual bool equals (sem_item *item, | |
415 | hash_map <symtab_node *, sem_item *> &ignored_nodes); | |
416 | ||
417 | /* Fast equality variable based on knowledge known in WPA. */ | |
46305737 JH |
418 | virtual bool equals_wpa (sem_item *item, |
419 | hash_map <symtab_node *, sem_item *> &ignored_nodes); | |
b84d4347 ML |
420 | |
421 | /* Returns varpool_node. */ | |
422 | inline varpool_node *get_node (void) | |
423 | { | |
424 | return dyn_cast <varpool_node *> (node); | |
425 | } | |
426 | ||
427 | /* Parser function that visits a varpool NODE. */ | |
428 | static sem_variable *parse (varpool_node *node, bitmap_obstack *stack); | |
429 | ||
b84d4347 | 430 | private: |
b84d4347 ML |
431 | /* Compares trees T1 and T2 for semantic equality. */ |
432 | static bool equals (tree t1, tree t2); | |
b84d4347 ML |
433 | }; // class sem_variable |
434 | ||
435 | class sem_item_optimizer; | |
436 | ||
437 | struct congruence_class_group | |
438 | { | |
439 | hashval_t hash; | |
440 | sem_item_type type; | |
441 | vec <congruence_class *> classes; | |
442 | }; | |
443 | ||
444 | /* Congruence class set structure. */ | |
3746a4b2 | 445 | struct congruence_class_hash : nofree_ptr_hash <congruence_class_group> |
b84d4347 | 446 | { |
67f58944 | 447 | static inline hashval_t hash (const congruence_class_group *item) |
b84d4347 ML |
448 | { |
449 | return item->hash; | |
450 | } | |
451 | ||
67f58944 TS |
452 | static inline int equal (const congruence_class_group *item1, |
453 | const congruence_class_group *item2) | |
b84d4347 ML |
454 | { |
455 | return item1->hash == item2->hash && item1->type == item2->type; | |
456 | } | |
457 | }; | |
458 | ||
459 | struct traverse_split_pair | |
460 | { | |
461 | sem_item_optimizer *optimizer; | |
462 | class congruence_class *cls; | |
463 | }; | |
464 | ||
465 | /* Semantic item optimizer includes all top-level logic | |
466 | related to semantic equality comparison. */ | |
467 | class sem_item_optimizer | |
468 | { | |
469 | public: | |
470 | sem_item_optimizer (); | |
471 | ~sem_item_optimizer (); | |
472 | ||
473 | /* Function responsible for visiting all potential functions and | |
474 | read-only variables that can be merged. */ | |
475 | void parse_funcs_and_vars (void); | |
476 | ||
bd31fe14 ML |
477 | /* Optimizer entry point which returns true in case it processes |
478 | a merge operation. True is returned if there's a merge operation | |
479 | processed. */ | |
480 | bool execute (void); | |
b84d4347 ML |
481 | |
482 | /* Dump function. */ | |
483 | void dump (void); | |
484 | ||
485 | /* Verify congruence classes if checking is enabled. */ | |
b2b29377 MM |
486 | void checking_verify_classes (void); |
487 | ||
488 | /* Verify congruence classes. */ | |
b84d4347 ML |
489 | void verify_classes (void); |
490 | ||
491 | /* Write IPA ICF summary for symbols. */ | |
492 | void write_summary (void); | |
493 | ||
026c3cfd | 494 | /* Read IPA ICF summary for symbols. */ |
b84d4347 ML |
495 | void read_summary (void); |
496 | ||
497 | /* Callgraph removal hook called for a NODE with a custom DATA. */ | |
498 | static void cgraph_removal_hook (cgraph_node *node, void *data); | |
499 | ||
500 | /* Varpool removal hook called for a NODE with a custom DATA. */ | |
501 | static void varpool_removal_hook (varpool_node *node, void *data); | |
502 | ||
503 | /* Worklist of congruence classes that can potentially | |
504 | refine classes of congruence. */ | |
505 | std::list<congruence_class *> worklist; | |
506 | ||
507 | /* Remove semantic ITEM and release memory. */ | |
508 | void remove_item (sem_item *item); | |
509 | ||
510 | /* Remove symtab NODE triggered by symtab removal hooks. */ | |
511 | void remove_symtab_node (symtab_node *node); | |
512 | ||
513 | /* Register callgraph and varpool hooks. */ | |
514 | void register_hooks (void); | |
515 | ||
516 | /* Unregister callgraph and varpool hooks. */ | |
517 | void unregister_hooks (void); | |
518 | ||
519 | /* Adds a CLS to hashtable associated by hash value. */ | |
520 | void add_class (congruence_class *cls); | |
521 | ||
522 | /* Gets a congruence class group based on given HASH value and TYPE. */ | |
523 | congruence_class_group *get_group_by_hash (hashval_t hash, | |
524 | sem_item_type type); | |
525 | ||
69f6b1f4 JH |
526 | /* Because types can be arbitrarily large, avoid quadratic bottleneck. */ |
527 | hash_map<const_tree, hashval_t> m_type_hash_cache; | |
b84d4347 ML |
528 | private: |
529 | ||
3ab93359 ML |
530 | /* For each semantic item, append hash values of references. */ |
531 | void update_hash_by_addr_refs (); | |
532 | ||
b84d4347 ML |
533 | /* Congruence classes are built by hash value. */ |
534 | void build_hash_based_classes (void); | |
535 | ||
536 | /* Semantic items in classes having more than one element and initialized. | |
537 | In case of WPA, we load function body. */ | |
538 | void parse_nonsingleton_classes (void); | |
539 | ||
540 | /* Equality function for semantic items is used to subdivide existing | |
541 | classes. If IN_WPA, fast equality function is invoked. */ | |
542 | void subdivide_classes_by_equality (bool in_wpa = false); | |
543 | ||
5ebd0e61 ML |
544 | /* Subdivide classes by address and interposable references |
545 | that members of the class reference. | |
546 | Example can be a pair of functions that have an address | |
547 | taken from a function. If these addresses are different the class | |
548 | is split. */ | |
549 | unsigned subdivide_classes_by_sensitive_refs(); | |
550 | ||
b84d4347 ML |
551 | /* Debug function prints all informations about congruence classes. */ |
552 | void dump_cong_classes (void); | |
553 | ||
554 | /* Build references according to call graph. */ | |
555 | void build_graph (void); | |
556 | ||
557 | /* Iterative congruence reduction function. */ | |
558 | void process_cong_reduction (void); | |
559 | ||
560 | /* After reduction is done, we can declare all items in a group | |
561 | to be equal. PREV_CLASS_COUNT is start number of classes | |
bd31fe14 ML |
562 | before reduction. True is returned if there's a merge operation |
563 | processed. */ | |
564 | bool merge_classes (unsigned int prev_class_count); | |
b84d4347 ML |
565 | |
566 | /* Adds a newly created congruence class CLS to worklist. */ | |
567 | void worklist_push (congruence_class *cls); | |
568 | ||
569 | /* Pops a class from worklist. */ | |
570 | congruence_class *worklist_pop (); | |
571 | ||
572 | /* Every usage of a congruence class CLS is a candidate that can split the | |
573 | collection of classes. Bitmap stack BMSTACK is used for bitmap | |
574 | allocation. */ | |
575 | void do_congruence_step (congruence_class *cls); | |
576 | ||
577 | /* Tests if a class CLS used as INDEXth splits any congruence classes. | |
578 | Bitmap stack BMSTACK is used for bitmap allocation. */ | |
579 | void do_congruence_step_for_index (congruence_class *cls, unsigned int index); | |
580 | ||
581 | /* Makes pairing between a congruence class CLS and semantic ITEM. */ | |
582 | static void add_item_to_class (congruence_class *cls, sem_item *item); | |
583 | ||
584 | /* Disposes split map traverse function. CLS is congruence | |
585 | class, BSLOT is bitmap slot we want to release. DATA is mandatory, | |
586 | but unused argument. */ | |
587 | static bool release_split_map (congruence_class * const &cls, bitmap const &b, | |
588 | traverse_split_pair *pair); | |
589 | ||
590 | /* Process split operation for a cognruence class CLS, | |
591 | where bitmap B splits congruence class members. DATA is used | |
592 | as argument of split pair. */ | |
593 | static bool traverse_congruence_split (congruence_class * const &cls, | |
594 | bitmap const &b, | |
595 | traverse_split_pair *pair); | |
596 | ||
597 | /* Reads a section from LTO stream file FILE_DATA. Input block for DATA | |
598 | contains LEN bytes. */ | |
599 | void read_section (lto_file_decl_data *file_data, const char *data, | |
600 | size_t len); | |
601 | ||
602 | /* Removes all callgraph and varpool nodes that are marked by symtab | |
603 | as deleted. */ | |
604 | void filter_removed_items (void); | |
605 | ||
606 | /* Vector of semantic items. */ | |
607 | vec <sem_item *> m_items; | |
608 | ||
609 | /* A set containing all items removed by hooks. */ | |
610 | hash_set <symtab_node *> m_removed_items_set; | |
611 | ||
df8391b4 | 612 | /* Hashtable of congruence classes. */ |
3746a4b2 | 613 | hash_table <congruence_class_hash> m_classes; |
df8391b4 | 614 | |
b84d4347 ML |
615 | /* Count of congruence classes. */ |
616 | unsigned int m_classes_count; | |
617 | ||
618 | /* Map data structure maps symtab nodes to semantic items. */ | |
619 | hash_map <symtab_node *, sem_item *> m_symtab_node_map; | |
620 | ||
621 | /* Set to true if a splitter class is removed. */ | |
622 | bool splitter_class_removed; | |
623 | ||
624 | /* Global unique class id counter. */ | |
625 | static unsigned int class_id; | |
626 | ||
627 | /* Callgraph node removal hook holder. */ | |
628 | cgraph_node_hook_list *m_cgraph_node_hooks; | |
629 | ||
630 | /* Varpool node removal hook holder. */ | |
631 | varpool_node_hook_list *m_varpool_node_hooks; | |
632 | ||
633 | /* Bitmap stack. */ | |
634 | bitmap_obstack m_bmstack; | |
635 | }; // class sem_item_optimizer | |
636 | ||
637 | } // ipa_icf namespace |