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b84d4347 | 1 | /* Interprocedural Identical Code Folding pass |
cbe34bb5 | 2 | Copyright (C) 2014-2017 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 | /* Interprocedural Identical Code Folding for functions and | |
23 | read-only variables. | |
24 | ||
25 | The goal of this transformation is to discover functions and read-only | |
26 | variables which do have exactly the same semantics. | |
27 | ||
28 | In case of functions, | |
29 | we could either create a virtual clone or do a simple function wrapper | |
30 | that will call equivalent function. If the function is just locally visible, | |
31 | all function calls can be redirected. For read-only variables, we create | |
32 | aliases if possible. | |
33 | ||
34 | Optimization pass arranges as follows: | |
35 | 1) All functions and read-only variables are visited and internal | |
36 | data structure, either sem_function or sem_variables is created. | |
37 | 2) For every symbol from the previous step, VAR_DECL and FUNCTION_DECL are | |
38 | saved and matched to corresponding sem_items. | |
39 | 3) These declaration are ignored for equality check and are solved | |
40 | by Value Numbering algorithm published by Alpert, Zadeck in 1992. | |
41 | 4) We compute hash value for each symbol. | |
42 | 5) Congruence classes are created based on hash value. If hash value are | |
43 | equal, equals function is called and symbols are deeply compared. | |
44 | We must prove that all SSA names, declarations and other items | |
45 | correspond. | |
46 | 6) Value Numbering is executed for these classes. At the end of the process | |
47 | all symbol members in remaining classes can be merged. | |
48 | 7) Merge operation creates alias in case of read-only variables. For | |
49 | callgraph node, we must decide if we can redirect local calls, | |
50 | create an alias or a thunk. | |
51 | ||
52 | */ | |
53 | ||
54 | #include "config.h" | |
2c384ad8 | 55 | #define INCLUDE_LIST |
b84d4347 ML |
56 | #include "system.h" |
57 | #include "coretypes.h" | |
c7131fb2 | 58 | #include "backend.h" |
957060b5 AM |
59 | #include "target.h" |
60 | #include "rtl.h" | |
40e23961 | 61 | #include "tree.h" |
b84d4347 | 62 | #include "gimple.h" |
957060b5 AM |
63 | #include "alloc-pool.h" |
64 | #include "tree-pass.h" | |
c7131fb2 | 65 | #include "ssa.h" |
957060b5 AM |
66 | #include "cgraph.h" |
67 | #include "coverage.h" | |
68 | #include "gimple-pretty-print.h" | |
69 | #include "data-streamer.h" | |
c7131fb2 | 70 | #include "fold-const.h" |
36566b39 | 71 | #include "calls.h" |
36566b39 | 72 | #include "varasm.h" |
b84d4347 | 73 | #include "gimple-iterator.h" |
b84d4347 | 74 | #include "tree-cfg.h" |
dd912cb8 | 75 | #include "symbol-summary.h" |
c582198b | 76 | #include "ipa-prop.h" |
27d020cf | 77 | #include "ipa-fnsummary.h" |
b84d4347 | 78 | #include "except.h" |
b84d4347 ML |
79 | #include "attribs.h" |
80 | #include "print-tree.h" | |
b84d4347 | 81 | #include "ipa-utils.h" |
b84d4347 ML |
82 | #include "ipa-icf-gimple.h" |
83 | #include "ipa-icf.h" | |
46305737 | 84 | #include "stor-layout.h" |
7aeb92b4 | 85 | #include "dbgcnt.h" |
b84d4347 ML |
86 | |
87 | using namespace ipa_icf_gimple; | |
88 | ||
89 | namespace ipa_icf { | |
5ebd0e61 | 90 | |
69f6b1f4 JH |
91 | /* Initialization and computation of symtab node hash, there data |
92 | are propagated later on. */ | |
93 | ||
94 | static sem_item_optimizer *optimizer = NULL; | |
95 | ||
5ebd0e61 ML |
96 | /* Constructor. */ |
97 | ||
98 | symbol_compare_collection::symbol_compare_collection (symtab_node *node) | |
99 | { | |
100 | m_references.create (0); | |
101 | m_interposables.create (0); | |
102 | ||
103 | ipa_ref *ref; | |
104 | ||
105 | if (is_a <varpool_node *> (node) && DECL_VIRTUAL_P (node->decl)) | |
106 | return; | |
107 | ||
977b01e3 | 108 | for (unsigned i = 0; node->iterate_reference (i, ref); i++) |
5ebd0e61 | 109 | { |
5ebd0e61 ML |
110 | if (ref->address_matters_p ()) |
111 | m_references.safe_push (ref->referred); | |
112 | ||
113 | if (ref->referred->get_availability () <= AVAIL_INTERPOSABLE) | |
114 | { | |
0a7246ee | 115 | if (ref->address_matters_p ()) |
5ebd0e61 ML |
116 | m_references.safe_push (ref->referred); |
117 | else | |
118 | m_interposables.safe_push (ref->referred); | |
119 | } | |
120 | } | |
121 | ||
122 | if (is_a <cgraph_node *> (node)) | |
123 | { | |
124 | cgraph_node *cnode = dyn_cast <cgraph_node *> (node); | |
125 | ||
126 | for (cgraph_edge *e = cnode->callees; e; e = e->next_callee) | |
127 | if (e->callee->get_availability () <= AVAIL_INTERPOSABLE) | |
128 | m_interposables.safe_push (e->callee); | |
129 | } | |
130 | } | |
131 | ||
b84d4347 ML |
132 | /* Constructor for key value pair, where _ITEM is key and _INDEX is a target. */ |
133 | ||
fedf2718 ML |
134 | sem_usage_pair::sem_usage_pair (sem_item *_item, unsigned int _index) |
135 | : item (_item), index (_index) | |
b84d4347 ML |
136 | { |
137 | } | |
138 | ||
fedf2718 ML |
139 | sem_item::sem_item (sem_item_type _type, bitmap_obstack *stack) |
140 | : type (_type), m_hash (-1), m_hash_set (false) | |
b84d4347 ML |
141 | { |
142 | setup (stack); | |
143 | } | |
144 | ||
b84d4347 | 145 | sem_item::sem_item (sem_item_type _type, symtab_node *_node, |
fedf2718 ML |
146 | bitmap_obstack *stack) |
147 | : type (_type), node (_node), m_hash (-1), m_hash_set (false) | |
b84d4347 ML |
148 | { |
149 | decl = node->decl; | |
150 | setup (stack); | |
151 | } | |
152 | ||
153 | /* Add reference to a semantic TARGET. */ | |
154 | ||
155 | void | |
156 | sem_item::add_reference (sem_item *target) | |
157 | { | |
158 | refs.safe_push (target); | |
159 | unsigned index = refs.length (); | |
160 | target->usages.safe_push (new sem_usage_pair(this, index)); | |
161 | bitmap_set_bit (target->usage_index_bitmap, index); | |
162 | refs_set.add (target->node); | |
163 | } | |
164 | ||
165 | /* Initialize internal data structures. Bitmap STACK is used for | |
166 | bitmap memory allocation process. */ | |
167 | ||
168 | void | |
169 | sem_item::setup (bitmap_obstack *stack) | |
170 | { | |
171 | gcc_checking_assert (node); | |
172 | ||
173 | refs.create (0); | |
174 | tree_refs.create (0); | |
175 | usages.create (0); | |
176 | usage_index_bitmap = BITMAP_ALLOC (stack); | |
177 | } | |
178 | ||
179 | sem_item::~sem_item () | |
180 | { | |
181 | for (unsigned i = 0; i < usages.length (); i++) | |
182 | delete usages[i]; | |
183 | ||
184 | refs.release (); | |
185 | tree_refs.release (); | |
186 | usages.release (); | |
187 | ||
188 | BITMAP_FREE (usage_index_bitmap); | |
189 | } | |
190 | ||
191 | /* Dump function for debugging purpose. */ | |
192 | ||
193 | DEBUG_FUNCTION void | |
194 | sem_item::dump (void) | |
195 | { | |
196 | if (dump_file) | |
197 | { | |
198 | fprintf (dump_file, "[%s] %s (%u) (tree:%p)\n", type == FUNC ? "func" : "var", | |
1aec2ecc | 199 | node->name(), node->order, (void *) node->decl); |
b84d4347 ML |
200 | fprintf (dump_file, " hash: %u\n", get_hash ()); |
201 | fprintf (dump_file, " references: "); | |
202 | ||
203 | for (unsigned i = 0; i < refs.length (); i++) | |
1aec2ecc | 204 | fprintf (dump_file, "%s%s ", refs[i]->node->name (), |
b84d4347 ML |
205 | i < refs.length() - 1 ? "," : ""); |
206 | ||
207 | fprintf (dump_file, "\n"); | |
208 | } | |
209 | } | |
210 | ||
f657d665 ML |
211 | /* Return true if target supports alias symbols. */ |
212 | ||
213 | bool | |
214 | sem_item::target_supports_symbol_aliases_p (void) | |
215 | { | |
216 | #if !defined (ASM_OUTPUT_DEF) || (!defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)) | |
217 | return false; | |
218 | #else | |
219 | return true; | |
220 | #endif | |
221 | } | |
222 | ||
808b6bb7 ML |
223 | void sem_item::set_hash (hashval_t hash) |
224 | { | |
225 | m_hash = hash; | |
fedf2718 | 226 | m_hash_set = true; |
808b6bb7 ML |
227 | } |
228 | ||
b84d4347 ML |
229 | /* Semantic function constructor that uses STACK as bitmap memory stack. */ |
230 | ||
fedf2718 ML |
231 | sem_function::sem_function (bitmap_obstack *stack) |
232 | : sem_item (FUNC, stack), m_checker (NULL), m_compared_func (NULL) | |
b84d4347 | 233 | { |
b84d4347 ML |
234 | bb_sizes.create (0); |
235 | bb_sorted.create (0); | |
236 | } | |
237 | ||
fedf2718 ML |
238 | sem_function::sem_function (cgraph_node *node, bitmap_obstack *stack) |
239 | : sem_item (FUNC, node, stack), m_checker (NULL), m_compared_func (NULL) | |
b84d4347 | 240 | { |
b84d4347 ML |
241 | bb_sizes.create (0); |
242 | bb_sorted.create (0); | |
243 | } | |
244 | ||
245 | sem_function::~sem_function () | |
246 | { | |
247 | for (unsigned i = 0; i < bb_sorted.length (); i++) | |
e27d328a | 248 | delete (bb_sorted[i]); |
b84d4347 | 249 | |
b84d4347 ML |
250 | bb_sizes.release (); |
251 | bb_sorted.release (); | |
252 | } | |
253 | ||
254 | /* Calculates hash value based on a BASIC_BLOCK. */ | |
255 | ||
256 | hashval_t | |
257 | sem_function::get_bb_hash (const sem_bb *basic_block) | |
258 | { | |
259 | inchash::hash hstate; | |
260 | ||
261 | hstate.add_int (basic_block->nondbg_stmt_count); | |
262 | hstate.add_int (basic_block->edge_count); | |
263 | ||
264 | return hstate.end (); | |
265 | } | |
266 | ||
267 | /* References independent hash function. */ | |
268 | ||
269 | hashval_t | |
270 | sem_function::get_hash (void) | |
271 | { | |
fedf2718 | 272 | if (!m_hash_set) |
b84d4347 ML |
273 | { |
274 | inchash::hash hstate; | |
275 | hstate.add_int (177454); /* Random number for function type. */ | |
276 | ||
277 | hstate.add_int (arg_count); | |
278 | hstate.add_int (cfg_checksum); | |
279 | hstate.add_int (gcode_hash); | |
280 | ||
281 | for (unsigned i = 0; i < bb_sorted.length (); i++) | |
282 | hstate.merge_hash (get_bb_hash (bb_sorted[i])); | |
283 | ||
284 | for (unsigned i = 0; i < bb_sizes.length (); i++) | |
285 | hstate.add_int (bb_sizes[i]); | |
286 | ||
69f6b1f4 JH |
287 | /* Add common features of declaration itself. */ |
288 | if (DECL_FUNCTION_SPECIFIC_TARGET (decl)) | |
289 | hstate.add_wide_int | |
290 | (cl_target_option_hash | |
291 | (TREE_TARGET_OPTION (DECL_FUNCTION_SPECIFIC_TARGET (decl)))); | |
292 | if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (decl)) | |
b93ee1bb | 293 | hstate.add_wide_int |
69f6b1f4 JH |
294 | (cl_optimization_hash |
295 | (TREE_OPTIMIZATION (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (decl)))); | |
69f6b1f4 JH |
296 | hstate.add_flag (DECL_CXX_CONSTRUCTOR_P (decl)); |
297 | hstate.add_flag (DECL_CXX_DESTRUCTOR_P (decl)); | |
298 | ||
808b6bb7 | 299 | set_hash (hstate.end ()); |
b84d4347 ML |
300 | } |
301 | ||
808b6bb7 | 302 | return m_hash; |
b84d4347 ML |
303 | } |
304 | ||
b3587b99 JH |
305 | /* Return ture if A1 and A2 represent equivalent function attribute lists. |
306 | Based on comp_type_attributes. */ | |
307 | ||
308 | bool | |
309 | sem_item::compare_attributes (const_tree a1, const_tree a2) | |
310 | { | |
311 | const_tree a; | |
312 | if (a1 == a2) | |
313 | return true; | |
314 | for (a = a1; a != NULL_TREE; a = TREE_CHAIN (a)) | |
315 | { | |
316 | const struct attribute_spec *as; | |
317 | const_tree attr; | |
318 | ||
319 | as = lookup_attribute_spec (get_attribute_name (a)); | |
320 | /* TODO: We can introduce as->affects_decl_identity | |
321 | and as->affects_decl_reference_identity if attribute mismatch | |
322 | gets a common reason to give up on merging. It may not be worth | |
323 | the effort. | |
324 | For example returns_nonnull affects only references, while | |
325 | optimize attribute can be ignored because it is already lowered | |
326 | into flags representation and compared separately. */ | |
327 | if (!as) | |
328 | continue; | |
329 | ||
330 | attr = lookup_attribute (as->name, CONST_CAST_TREE (a2)); | |
331 | if (!attr || !attribute_value_equal (a, attr)) | |
332 | break; | |
333 | } | |
334 | if (!a) | |
335 | { | |
336 | for (a = a2; a != NULL_TREE; a = TREE_CHAIN (a)) | |
337 | { | |
338 | const struct attribute_spec *as; | |
339 | ||
340 | as = lookup_attribute_spec (get_attribute_name (a)); | |
341 | if (!as) | |
342 | continue; | |
343 | ||
344 | if (!lookup_attribute (as->name, CONST_CAST_TREE (a1))) | |
345 | break; | |
346 | /* We don't need to compare trees again, as we did this | |
347 | already in first loop. */ | |
348 | } | |
349 | if (!a) | |
350 | return true; | |
351 | } | |
352 | /* TODO: As in comp_type_attributes we may want to introduce target hook. */ | |
353 | return false; | |
354 | } | |
355 | ||
977b01e3 JH |
356 | /* Compare properties of symbols N1 and N2 that does not affect semantics of |
357 | symbol itself but affects semantics of its references from USED_BY (which | |
358 | may be NULL if it is unknown). If comparsion is false, symbols | |
359 | can still be merged but any symbols referring them can't. | |
360 | ||
361 | If ADDRESS is true, do extra checking needed for IPA_REF_ADDR. | |
362 | ||
363 | TODO: We can also split attributes to those that determine codegen of | |
364 | a function body/variable constructor itself and those that are used when | |
365 | referring to it. */ | |
366 | ||
367 | bool | |
368 | sem_item::compare_referenced_symbol_properties (symtab_node *used_by, | |
369 | symtab_node *n1, | |
370 | symtab_node *n2, | |
371 | bool address) | |
372 | { | |
373 | if (is_a <cgraph_node *> (n1)) | |
374 | { | |
375 | /* Inline properties matters: we do now want to merge uses of inline | |
376 | function to uses of normal function because inline hint would be lost. | |
377 | We however can merge inline function to noinline because the alias | |
378 | will keep its DECL_DECLARED_INLINE flag. | |
379 | ||
380 | Also ignore inline flag when optimizing for size or when function | |
381 | is known to not be inlinable. | |
382 | ||
383 | TODO: the optimize_size checks can also be assumed to be true if | |
384 | unit has no !optimize_size functions. */ | |
385 | ||
386 | if ((!used_by || address || !is_a <cgraph_node *> (used_by) | |
387 | || !opt_for_fn (used_by->decl, optimize_size)) | |
388 | && !opt_for_fn (n1->decl, optimize_size) | |
389 | && n1->get_availability () > AVAIL_INTERPOSABLE | |
390 | && (!DECL_UNINLINABLE (n1->decl) || !DECL_UNINLINABLE (n2->decl))) | |
391 | { | |
392 | if (DECL_DISREGARD_INLINE_LIMITS (n1->decl) | |
393 | != DECL_DISREGARD_INLINE_LIMITS (n2->decl)) | |
394 | return return_false_with_msg | |
395 | ("DECL_DISREGARD_INLINE_LIMITS are different"); | |
396 | ||
397 | if (DECL_DECLARED_INLINE_P (n1->decl) | |
398 | != DECL_DECLARED_INLINE_P (n2->decl)) | |
399 | return return_false_with_msg ("inline attributes are different"); | |
400 | } | |
401 | ||
402 | if (DECL_IS_OPERATOR_NEW (n1->decl) | |
403 | != DECL_IS_OPERATOR_NEW (n2->decl)) | |
404 | return return_false_with_msg ("operator new flags are different"); | |
405 | } | |
406 | ||
407 | /* Merging two definitions with a reference to equivalent vtables, but | |
408 | belonging to a different type may result in ipa-polymorphic-call analysis | |
409 | giving a wrong answer about the dynamic type of instance. */ | |
410 | if (is_a <varpool_node *> (n1)) | |
411 | { | |
412 | if ((DECL_VIRTUAL_P (n1->decl) || DECL_VIRTUAL_P (n2->decl)) | |
413 | && (DECL_VIRTUAL_P (n1->decl) != DECL_VIRTUAL_P (n2->decl) | |
414 | || !types_must_be_same_for_odr (DECL_CONTEXT (n1->decl), | |
415 | DECL_CONTEXT (n2->decl))) | |
416 | && (!used_by || !is_a <cgraph_node *> (used_by) || address | |
417 | || opt_for_fn (used_by->decl, flag_devirtualize))) | |
418 | return return_false_with_msg | |
419 | ("references to virtual tables can not be merged"); | |
b3587b99 JH |
420 | |
421 | if (address && DECL_ALIGN (n1->decl) != DECL_ALIGN (n2->decl)) | |
422 | return return_false_with_msg ("alignment mismatch"); | |
423 | ||
424 | /* For functions we compare attributes in equals_wpa, because we do | |
425 | not know what attributes may cause codegen differences, but for | |
426 | variables just compare attributes for references - the codegen | |
427 | for constructors is affected only by those attributes that we lower | |
428 | to explicit representation (such as DECL_ALIGN or DECL_SECTION). */ | |
429 | if (!compare_attributes (DECL_ATTRIBUTES (n1->decl), | |
430 | DECL_ATTRIBUTES (n2->decl))) | |
431 | return return_false_with_msg ("different var decl attributes"); | |
432 | if (comp_type_attributes (TREE_TYPE (n1->decl), | |
433 | TREE_TYPE (n2->decl)) != 1) | |
434 | return return_false_with_msg ("different var type attributes"); | |
977b01e3 JH |
435 | } |
436 | ||
437 | /* When matching virtual tables, be sure to also match information | |
438 | relevant for polymorphic call analysis. */ | |
439 | if (used_by && is_a <varpool_node *> (used_by) | |
440 | && DECL_VIRTUAL_P (used_by->decl)) | |
441 | { | |
442 | if (DECL_VIRTUAL_P (n1->decl) != DECL_VIRTUAL_P (n2->decl)) | |
443 | return return_false_with_msg ("virtual flag mismatch"); | |
444 | if (DECL_VIRTUAL_P (n1->decl) && is_a <cgraph_node *> (n1) | |
445 | && (DECL_FINAL_P (n1->decl) != DECL_FINAL_P (n2->decl))) | |
446 | return return_false_with_msg ("final flag mismatch"); | |
447 | } | |
448 | return true; | |
449 | } | |
450 | ||
451 | /* Hash properties that are compared by compare_referenced_symbol_properties. */ | |
452 | ||
453 | void | |
454 | sem_item::hash_referenced_symbol_properties (symtab_node *ref, | |
455 | inchash::hash &hstate, | |
456 | bool address) | |
457 | { | |
458 | if (is_a <cgraph_node *> (ref)) | |
459 | { | |
d57c9945 | 460 | if ((type != FUNC || address || !opt_for_fn (decl, optimize_size)) |
977b01e3 JH |
461 | && !opt_for_fn (ref->decl, optimize_size) |
462 | && !DECL_UNINLINABLE (ref->decl)) | |
463 | { | |
464 | hstate.add_flag (DECL_DISREGARD_INLINE_LIMITS (ref->decl)); | |
465 | hstate.add_flag (DECL_DECLARED_INLINE_P (ref->decl)); | |
466 | } | |
467 | hstate.add_flag (DECL_IS_OPERATOR_NEW (ref->decl)); | |
468 | } | |
469 | else if (is_a <varpool_node *> (ref)) | |
470 | { | |
471 | hstate.add_flag (DECL_VIRTUAL_P (ref->decl)); | |
b3587b99 JH |
472 | if (address) |
473 | hstate.add_int (DECL_ALIGN (ref->decl)); | |
977b01e3 JH |
474 | } |
475 | } | |
476 | ||
477 | ||
b84d4347 ML |
478 | /* For a given symbol table nodes N1 and N2, we check that FUNCTION_DECLs |
479 | point to a same function. Comparison can be skipped if IGNORED_NODES | |
b6cddc7f | 480 | contains these nodes. ADDRESS indicate if address is taken. */ |
b84d4347 ML |
481 | |
482 | bool | |
977b01e3 | 483 | sem_item::compare_symbol_references ( |
b6cddc7f ML |
484 | hash_map <symtab_node *, sem_item *> &ignored_nodes, |
485 | symtab_node *n1, symtab_node *n2, bool address) | |
b84d4347 | 486 | { |
b6cddc7f ML |
487 | enum availability avail1, avail2; |
488 | ||
fe75bd20 JH |
489 | if (n1 == n2) |
490 | return true; | |
491 | ||
523f0450 JH |
492 | /* Never match variable and function. */ |
493 | if (is_a <varpool_node *> (n1) != is_a <varpool_node *> (n2)) | |
494 | return false; | |
495 | ||
977b01e3 JH |
496 | if (!compare_referenced_symbol_properties (node, n1, n2, address)) |
497 | return false; | |
b6cddc7f ML |
498 | if (address && n1->equal_address_to (n2) == 1) |
499 | return true; | |
500 | if (!address && n1->semantically_equivalent_p (n2)) | |
b84d4347 ML |
501 | return true; |
502 | ||
b6cddc7f ML |
503 | n1 = n1->ultimate_alias_target (&avail1); |
504 | n2 = n2->ultimate_alias_target (&avail2); | |
505 | ||
d7e2ff72 JH |
506 | if (avail1 > AVAIL_INTERPOSABLE && ignored_nodes.get (n1) |
507 | && avail2 > AVAIL_INTERPOSABLE && ignored_nodes.get (n2)) | |
b6cddc7f | 508 | return true; |
b84d4347 ML |
509 | |
510 | return return_false_with_msg ("different references"); | |
511 | } | |
512 | ||
513 | /* If cgraph edges E1 and E2 are indirect calls, verify that | |
514 | ECF flags are the same. */ | |
515 | ||
516 | bool sem_function::compare_edge_flags (cgraph_edge *e1, cgraph_edge *e2) | |
517 | { | |
518 | if (e1->indirect_info && e2->indirect_info) | |
519 | { | |
520 | int e1_flags = e1->indirect_info->ecf_flags; | |
521 | int e2_flags = e2->indirect_info->ecf_flags; | |
522 | ||
523 | if (e1_flags != e2_flags) | |
524 | return return_false_with_msg ("ICF flags are different"); | |
525 | } | |
526 | else if (e1->indirect_info || e2->indirect_info) | |
527 | return false; | |
528 | ||
529 | return true; | |
530 | } | |
531 | ||
b3587b99 JH |
532 | /* Return true if parameter I may be used. */ |
533 | ||
534 | bool | |
535 | sem_function::param_used_p (unsigned int i) | |
536 | { | |
537 | if (ipa_node_params_sum == NULL) | |
b0187578 | 538 | return true; |
b3587b99 JH |
539 | |
540 | struct ipa_node_params *parms_info = IPA_NODE_REF (get_node ()); | |
541 | ||
f65f1ae3 MJ |
542 | if (vec_safe_length (parms_info->descriptors) <= i) |
543 | return true; | |
b3587b99 JH |
544 | |
545 | return ipa_is_param_used (IPA_NODE_REF (get_node ()), i); | |
546 | } | |
547 | ||
1628e36b JH |
548 | /* Perform additional check needed to match types function parameters that are |
549 | used. Unlike for normal decls it matters if type is TYPE_RESTRICT and we | |
550 | make an assumption that REFERENCE_TYPE parameters are always non-NULL. */ | |
551 | ||
552 | bool | |
553 | sem_function::compatible_parm_types_p (tree parm1, tree parm2) | |
554 | { | |
555 | /* Be sure that parameters are TBAA compatible. */ | |
556 | if (!func_checker::compatible_types_p (parm1, parm2)) | |
557 | return return_false_with_msg ("parameter type is not compatible"); | |
558 | ||
559 | if (POINTER_TYPE_P (parm1) | |
560 | && (TYPE_RESTRICT (parm1) != TYPE_RESTRICT (parm2))) | |
561 | return return_false_with_msg ("argument restrict flag mismatch"); | |
562 | ||
563 | /* nonnull_arg_p implies non-zero range to REFERENCE types. */ | |
564 | if (POINTER_TYPE_P (parm1) | |
565 | && TREE_CODE (parm1) != TREE_CODE (parm2) | |
566 | && opt_for_fn (decl, flag_delete_null_pointer_checks)) | |
567 | return return_false_with_msg ("pointer wrt reference mismatch"); | |
568 | ||
569 | return true; | |
570 | } | |
571 | ||
b84d4347 ML |
572 | /* Fast equality function based on knowledge known in WPA. */ |
573 | ||
574 | bool | |
575 | sem_function::equals_wpa (sem_item *item, | |
576 | hash_map <symtab_node *, sem_item *> &ignored_nodes) | |
577 | { | |
578 | gcc_assert (item->type == FUNC); | |
fb5c322e JH |
579 | cgraph_node *cnode = dyn_cast <cgraph_node *> (node); |
580 | cgraph_node *cnode2 = dyn_cast <cgraph_node *> (item->node); | |
b84d4347 ML |
581 | |
582 | m_compared_func = static_cast<sem_function *> (item); | |
583 | ||
fb5c322e JH |
584 | if (cnode->thunk.thunk_p != cnode2->thunk.thunk_p) |
585 | return return_false_with_msg ("thunk_p mismatch"); | |
586 | ||
587 | if (cnode->thunk.thunk_p) | |
588 | { | |
589 | if (cnode->thunk.fixed_offset != cnode2->thunk.fixed_offset) | |
590 | return return_false_with_msg ("thunk fixed_offset mismatch"); | |
591 | if (cnode->thunk.virtual_value != cnode2->thunk.virtual_value) | |
592 | return return_false_with_msg ("thunk virtual_value mismatch"); | |
593 | if (cnode->thunk.this_adjusting != cnode2->thunk.this_adjusting) | |
594 | return return_false_with_msg ("thunk this_adjusting mismatch"); | |
595 | if (cnode->thunk.virtual_offset_p != cnode2->thunk.virtual_offset_p) | |
596 | return return_false_with_msg ("thunk virtual_offset_p mismatch"); | |
597 | if (cnode->thunk.add_pointer_bounds_args | |
598 | != cnode2->thunk.add_pointer_bounds_args) | |
599 | return return_false_with_msg ("thunk add_pointer_bounds_args mismatch"); | |
600 | } | |
601 | ||
c4234544 JH |
602 | /* Compare special function DECL attributes. */ |
603 | if (DECL_FUNCTION_PERSONALITY (decl) | |
604 | != DECL_FUNCTION_PERSONALITY (item->decl)) | |
605 | return return_false_with_msg ("function personalities are different"); | |
606 | ||
c4234544 JH |
607 | if (DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (decl) |
608 | != DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (item->decl)) | |
609 | return return_false_with_msg ("intrument function entry exit " | |
610 | "attributes are different"); | |
611 | ||
612 | if (DECL_NO_LIMIT_STACK (decl) != DECL_NO_LIMIT_STACK (item->decl)) | |
613 | return return_false_with_msg ("no stack limit attributes are different"); | |
614 | ||
060cfff4 | 615 | if (DECL_CXX_CONSTRUCTOR_P (decl) != DECL_CXX_CONSTRUCTOR_P (item->decl)) |
69f6b1f4 | 616 | return return_false_with_msg ("DECL_CXX_CONSTRUCTOR mismatch"); |
060cfff4 JH |
617 | |
618 | if (DECL_CXX_DESTRUCTOR_P (decl) != DECL_CXX_DESTRUCTOR_P (item->decl)) | |
69f6b1f4 | 619 | return return_false_with_msg ("DECL_CXX_DESTRUCTOR mismatch"); |
060cfff4 | 620 | |
b3587b99 JH |
621 | /* TODO: pure/const flags mostly matters only for references, except for |
622 | the fact that codegen takes LOOPING flag as a hint that loops are | |
623 | finite. We may arrange the code to always pick leader that has least | |
624 | specified flags and then this can go into comparing symbol properties. */ | |
c4234544 JH |
625 | if (flags_from_decl_or_type (decl) != flags_from_decl_or_type (item->decl)) |
626 | return return_false_with_msg ("decl_or_type flags are different"); | |
627 | ||
060cfff4 JH |
628 | /* Do not match polymorphic constructors of different types. They calls |
629 | type memory location for ipa-polymorphic-call and we do not want | |
630 | it to get confused by wrong type. */ | |
631 | if (DECL_CXX_CONSTRUCTOR_P (decl) | |
632 | && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE) | |
633 | { | |
634 | if (TREE_CODE (TREE_TYPE (item->decl)) != METHOD_TYPE) | |
635 | return return_false_with_msg ("DECL_CXX_CONSTURCTOR type mismatch"); | |
636 | else if (!func_checker::compatible_polymorphic_types_p | |
70e7f2a2 JH |
637 | (TYPE_METHOD_BASETYPE (TREE_TYPE (decl)), |
638 | TYPE_METHOD_BASETYPE (TREE_TYPE (item->decl)), false)) | |
060cfff4 JH |
639 | return return_false_with_msg ("ctor polymorphic type mismatch"); |
640 | } | |
641 | ||
c4234544 JH |
642 | /* Checking function TARGET and OPTIMIZATION flags. */ |
643 | cl_target_option *tar1 = target_opts_for_fn (decl); | |
644 | cl_target_option *tar2 = target_opts_for_fn (item->decl); | |
645 | ||
646 | if (tar1 != tar2 && !cl_target_option_eq (tar1, tar2)) | |
647 | { | |
648 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
649 | { | |
650 | fprintf (dump_file, "target flags difference"); | |
651 | cl_target_option_print_diff (dump_file, 2, tar1, tar2); | |
652 | } | |
653 | ||
654 | return return_false_with_msg ("Target flags are different"); | |
655 | } | |
656 | ||
657 | cl_optimization *opt1 = opts_for_fn (decl); | |
658 | cl_optimization *opt2 = opts_for_fn (item->decl); | |
659 | ||
660 | if (opt1 != opt2 && memcmp (opt1, opt2, sizeof(cl_optimization))) | |
661 | { | |
662 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
663 | { | |
664 | fprintf (dump_file, "optimization flags difference"); | |
665 | cl_optimization_print_diff (dump_file, 2, opt1, opt2); | |
666 | } | |
667 | ||
668 | return return_false_with_msg ("optimization flags are different"); | |
669 | } | |
670 | ||
671 | /* Result type checking. */ | |
1628e36b JH |
672 | if (!func_checker::compatible_types_p |
673 | (TREE_TYPE (TREE_TYPE (decl)), | |
674 | TREE_TYPE (TREE_TYPE (m_compared_func->decl)))) | |
c4234544 JH |
675 | return return_false_with_msg ("result types are different"); |
676 | ||
b84d4347 | 677 | /* Checking types of arguments. */ |
1628e36b JH |
678 | tree list1 = TYPE_ARG_TYPES (TREE_TYPE (decl)), |
679 | list2 = TYPE_ARG_TYPES (TREE_TYPE (m_compared_func->decl)); | |
680 | for (unsigned i = 0; list1 && list2; | |
681 | list1 = TREE_CHAIN (list1), list2 = TREE_CHAIN (list2), i++) | |
b84d4347 | 682 | { |
1628e36b JH |
683 | tree parm1 = TREE_VALUE (list1); |
684 | tree parm2 = TREE_VALUE (list2); | |
685 | ||
b84d4347 | 686 | /* This guard is here for function pointer with attributes (pr59927.c). */ |
1628e36b | 687 | if (!parm1 || !parm2) |
b84d4347 ML |
688 | return return_false_with_msg ("NULL argument type"); |
689 | ||
1628e36b JH |
690 | /* Verify that types are compatible to ensure that both functions |
691 | have same calling conventions. */ | |
692 | if (!types_compatible_p (parm1, parm2)) | |
693 | return return_false_with_msg ("parameter types are not compatible"); | |
b3587b99 | 694 | |
b3587b99 JH |
695 | if (!param_used_p (i)) |
696 | continue; | |
1628e36b JH |
697 | |
698 | /* Perform additional checks for used parameters. */ | |
699 | if (!compatible_parm_types_p (parm1, parm2)) | |
700 | return false; | |
b84d4347 ML |
701 | } |
702 | ||
1628e36b JH |
703 | if (list1 || list2) |
704 | return return_false_with_msg ("Mismatched number of parameters"); | |
705 | ||
b84d4347 ML |
706 | if (node->num_references () != item->node->num_references ()) |
707 | return return_false_with_msg ("different number of references"); | |
708 | ||
b3587b99 JH |
709 | /* Checking function attributes. |
710 | This is quadratic in number of attributes */ | |
fe75bd20 JH |
711 | if (comp_type_attributes (TREE_TYPE (decl), |
712 | TREE_TYPE (item->decl)) != 1) | |
713 | return return_false_with_msg ("different type attributes"); | |
b3587b99 JH |
714 | if (!compare_attributes (DECL_ATTRIBUTES (decl), |
715 | DECL_ATTRIBUTES (item->decl))) | |
716 | return return_false_with_msg ("different decl attributes"); | |
fe75bd20 | 717 | |
060cfff4 JH |
718 | /* The type of THIS pointer type memory location for |
719 | ipa-polymorphic-call-analysis. */ | |
720 | if (opt_for_fn (decl, flag_devirtualize) | |
721 | && (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE | |
722 | || TREE_CODE (TREE_TYPE (item->decl)) == METHOD_TYPE) | |
b3587b99 | 723 | && param_used_p (0) |
060cfff4 JH |
724 | && compare_polymorphic_p ()) |
725 | { | |
726 | if (TREE_CODE (TREE_TYPE (decl)) != TREE_CODE (TREE_TYPE (item->decl))) | |
727 | return return_false_with_msg ("METHOD_TYPE and FUNCTION_TYPE mismatch"); | |
728 | if (!func_checker::compatible_polymorphic_types_p | |
70e7f2a2 JH |
729 | (TYPE_METHOD_BASETYPE (TREE_TYPE (decl)), |
730 | TYPE_METHOD_BASETYPE (TREE_TYPE (item->decl)), false)) | |
060cfff4 JH |
731 | return return_false_with_msg ("THIS pointer ODR type mismatch"); |
732 | } | |
733 | ||
b84d4347 ML |
734 | ipa_ref *ref = NULL, *ref2 = NULL; |
735 | for (unsigned i = 0; node->iterate_reference (i, ref); i++) | |
736 | { | |
737 | item->node->iterate_reference (i, ref2); | |
738 | ||
b3587b99 JH |
739 | if (ref->use != ref2->use) |
740 | return return_false_with_msg ("reference use mismatch"); | |
741 | ||
977b01e3 | 742 | if (!compare_symbol_references (ignored_nodes, ref->referred, |
b6cddc7f ML |
743 | ref2->referred, |
744 | ref->address_matters_p ())) | |
b84d4347 ML |
745 | return false; |
746 | } | |
747 | ||
748 | cgraph_edge *e1 = dyn_cast <cgraph_node *> (node)->callees; | |
749 | cgraph_edge *e2 = dyn_cast <cgraph_node *> (item->node)->callees; | |
750 | ||
751 | while (e1 && e2) | |
752 | { | |
977b01e3 | 753 | if (!compare_symbol_references (ignored_nodes, e1->callee, |
b6cddc7f | 754 | e2->callee, false)) |
b84d4347 | 755 | return false; |
b3587b99 JH |
756 | if (!compare_edge_flags (e1, e2)) |
757 | return false; | |
b84d4347 ML |
758 | |
759 | e1 = e1->next_callee; | |
760 | e2 = e2->next_callee; | |
761 | } | |
762 | ||
763 | if (e1 || e2) | |
b3587b99 JH |
764 | return return_false_with_msg ("different number of calls"); |
765 | ||
766 | e1 = dyn_cast <cgraph_node *> (node)->indirect_calls; | |
767 | e2 = dyn_cast <cgraph_node *> (item->node)->indirect_calls; | |
768 | ||
769 | while (e1 && e2) | |
770 | { | |
771 | if (!compare_edge_flags (e1, e2)) | |
772 | return false; | |
773 | ||
774 | e1 = e1->next_callee; | |
775 | e2 = e2->next_callee; | |
776 | } | |
777 | ||
778 | if (e1 || e2) | |
779 | return return_false_with_msg ("different number of indirect calls"); | |
b84d4347 ML |
780 | |
781 | return true; | |
782 | } | |
783 | ||
3ab93359 ML |
784 | /* Update hash by address sensitive references. We iterate over all |
785 | sensitive references (address_matters_p) and we hash ultime alias | |
786 | target of these nodes, which can improve a semantic item hash. | |
977b01e3 JH |
787 | |
788 | Also hash in referenced symbols properties. This can be done at any time | |
789 | (as the properties should not change), but it is convenient to do it here | |
790 | while we walk the references anyway. */ | |
3ab93359 ML |
791 | |
792 | void | |
793 | sem_item::update_hash_by_addr_refs (hash_map <symtab_node *, | |
794 | sem_item *> &m_symtab_node_map) | |
795 | { | |
3ab93359 | 796 | ipa_ref* ref; |
808b6bb7 | 797 | inchash::hash hstate (get_hash ()); |
977b01e3 JH |
798 | |
799 | for (unsigned i = 0; node->iterate_reference (i, ref); i++) | |
3ab93359 | 800 | { |
b3587b99 | 801 | hstate.add_int (ref->use); |
977b01e3 JH |
802 | hash_referenced_symbol_properties (ref->referred, hstate, |
803 | ref->use == IPA_REF_ADDR); | |
3ab93359 | 804 | if (ref->address_matters_p () || !m_symtab_node_map.get (ref->referred)) |
f45be077 | 805 | hstate.add_int (ref->referred->ultimate_alias_target ()->order); |
3ab93359 ML |
806 | } |
807 | ||
808 | if (is_a <cgraph_node *> (node)) | |
809 | { | |
810 | for (cgraph_edge *e = dyn_cast <cgraph_node *> (node)->callers; e; | |
811 | e = e->next_caller) | |
812 | { | |
813 | sem_item **result = m_symtab_node_map.get (e->callee); | |
977b01e3 | 814 | hash_referenced_symbol_properties (e->callee, hstate, false); |
3ab93359 | 815 | if (!result) |
f45be077 | 816 | hstate.add_int (e->callee->ultimate_alias_target ()->order); |
3ab93359 ML |
817 | } |
818 | } | |
819 | ||
808b6bb7 | 820 | set_hash (hstate.end ()); |
3ab93359 ML |
821 | } |
822 | ||
823 | /* Update hash by computed local hash values taken from different | |
977b01e3 JH |
824 | semantic items. |
825 | TODO: stronger SCC based hashing would be desirable here. */ | |
3ab93359 ML |
826 | |
827 | void | |
828 | sem_item::update_hash_by_local_refs (hash_map <symtab_node *, | |
829 | sem_item *> &m_symtab_node_map) | |
830 | { | |
977b01e3 | 831 | ipa_ref* ref; |
808b6bb7 | 832 | inchash::hash state (get_hash ()); |
977b01e3 JH |
833 | |
834 | for (unsigned j = 0; node->iterate_reference (j, ref); j++) | |
3ab93359 | 835 | { |
3ab93359 ML |
836 | sem_item **result = m_symtab_node_map.get (ref->referring); |
837 | if (result) | |
808b6bb7 | 838 | state.merge_hash ((*result)->get_hash ()); |
3ab93359 ML |
839 | } |
840 | ||
841 | if (type == FUNC) | |
842 | { | |
843 | for (cgraph_edge *e = dyn_cast <cgraph_node *> (node)->callees; e; | |
844 | e = e->next_callee) | |
845 | { | |
846 | sem_item **result = m_symtab_node_map.get (e->caller); | |
847 | if (result) | |
808b6bb7 | 848 | state.merge_hash ((*result)->get_hash ()); |
3ab93359 ML |
849 | } |
850 | } | |
851 | ||
852 | global_hash = state.end (); | |
853 | } | |
854 | ||
b84d4347 ML |
855 | /* Returns true if the item equals to ITEM given as argument. */ |
856 | ||
857 | bool | |
858 | sem_function::equals (sem_item *item, | |
fb5c322e | 859 | hash_map <symtab_node *, sem_item *> &) |
b84d4347 ML |
860 | { |
861 | gcc_assert (item->type == FUNC); | |
fb5c322e | 862 | bool eq = equals_private (item); |
b84d4347 ML |
863 | |
864 | if (m_checker != NULL) | |
865 | { | |
866 | delete m_checker; | |
867 | m_checker = NULL; | |
868 | } | |
869 | ||
870 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
871 | fprintf (dump_file, | |
872 | "Equals called for:%s:%s (%u:%u) (%s:%s) with result: %s\n\n", | |
1aec2ecc ML |
873 | xstrdup_for_dump (node->name()), |
874 | xstrdup_for_dump (item->node->name ()), | |
875 | node->order, | |
876 | item->node->order, | |
877 | xstrdup_for_dump (node->asm_name ()), | |
878 | xstrdup_for_dump (item->node->asm_name ()), | |
879 | eq ? "true" : "false"); | |
b84d4347 ML |
880 | |
881 | return eq; | |
882 | } | |
883 | ||
884 | /* Processes function equality comparison. */ | |
885 | ||
886 | bool | |
fb5c322e | 887 | sem_function::equals_private (sem_item *item) |
b84d4347 ML |
888 | { |
889 | if (item->type != FUNC) | |
890 | return false; | |
891 | ||
892 | basic_block bb1, bb2; | |
893 | edge e1, e2; | |
894 | edge_iterator ei1, ei2; | |
b84d4347 ML |
895 | bool result = true; |
896 | tree arg1, arg2; | |
897 | ||
898 | m_compared_func = static_cast<sem_function *> (item); | |
899 | ||
900 | gcc_assert (decl != item->decl); | |
901 | ||
902 | if (bb_sorted.length () != m_compared_func->bb_sorted.length () | |
903 | || edge_count != m_compared_func->edge_count | |
904 | || cfg_checksum != m_compared_func->cfg_checksum) | |
905 | return return_false (); | |
906 | ||
b84d4347 ML |
907 | m_checker = new func_checker (decl, m_compared_func->decl, |
908 | compare_polymorphic_p (), | |
909 | false, | |
910 | &refs_set, | |
911 | &m_compared_func->refs_set); | |
1628e36b JH |
912 | arg1 = DECL_ARGUMENTS (decl); |
913 | arg2 = DECL_ARGUMENTS (m_compared_func->decl); | |
914 | for (unsigned i = 0; | |
915 | arg1 && arg2; arg1 = DECL_CHAIN (arg1), arg2 = DECL_CHAIN (arg2), i++) | |
916 | { | |
917 | if (!types_compatible_p (TREE_TYPE (arg1), TREE_TYPE (arg2))) | |
918 | return return_false_with_msg ("argument types are not compatible"); | |
919 | if (!param_used_p (i)) | |
920 | continue; | |
921 | /* Perform additional checks for used parameters. */ | |
922 | if (!compatible_parm_types_p (TREE_TYPE (arg1), TREE_TYPE (arg2))) | |
923 | return false; | |
924 | if (!m_checker->compare_decl (arg1, arg2)) | |
925 | return return_false (); | |
926 | } | |
927 | if (arg1 || arg2) | |
928 | return return_false_with_msg ("Mismatched number of arguments"); | |
b84d4347 | 929 | |
fb5c322e JH |
930 | if (!dyn_cast <cgraph_node *> (node)->has_gimple_body_p ()) |
931 | return true; | |
932 | ||
b84d4347 ML |
933 | /* Fill-up label dictionary. */ |
934 | for (unsigned i = 0; i < bb_sorted.length (); ++i) | |
935 | { | |
936 | m_checker->parse_labels (bb_sorted[i]); | |
937 | m_checker->parse_labels (m_compared_func->bb_sorted[i]); | |
938 | } | |
939 | ||
940 | /* Checking all basic blocks. */ | |
941 | for (unsigned i = 0; i < bb_sorted.length (); ++i) | |
942 | if(!m_checker->compare_bb (bb_sorted[i], m_compared_func->bb_sorted[i])) | |
943 | return return_false(); | |
944 | ||
945 | dump_message ("All BBs are equal\n"); | |
946 | ||
c190efcc ML |
947 | auto_vec <int> bb_dict; |
948 | ||
b84d4347 ML |
949 | /* Basic block edges check. */ |
950 | for (unsigned i = 0; i < bb_sorted.length (); ++i) | |
951 | { | |
b84d4347 ML |
952 | bb1 = bb_sorted[i]->bb; |
953 | bb2 = m_compared_func->bb_sorted[i]->bb; | |
954 | ||
955 | ei2 = ei_start (bb2->preds); | |
956 | ||
957 | for (ei1 = ei_start (bb1->preds); ei_cond (ei1, &e1); ei_next (&ei1)) | |
958 | { | |
959 | ei_cond (ei2, &e2); | |
960 | ||
961 | if (e1->flags != e2->flags) | |
962 | return return_false_with_msg ("flags comparison returns false"); | |
963 | ||
1216ea72 | 964 | if (!bb_dict_test (&bb_dict, e1->src->index, e2->src->index)) |
b84d4347 ML |
965 | return return_false_with_msg ("edge comparison returns false"); |
966 | ||
1216ea72 | 967 | if (!bb_dict_test (&bb_dict, e1->dest->index, e2->dest->index)) |
b84d4347 ML |
968 | return return_false_with_msg ("BB comparison returns false"); |
969 | ||
970 | if (!m_checker->compare_edge (e1, e2)) | |
971 | return return_false_with_msg ("edge comparison returns false"); | |
972 | ||
973 | ei_next (&ei2); | |
974 | } | |
975 | } | |
976 | ||
977 | /* Basic block PHI nodes comparison. */ | |
978 | for (unsigned i = 0; i < bb_sorted.length (); i++) | |
979 | if (!compare_phi_node (bb_sorted[i]->bb, m_compared_func->bb_sorted[i]->bb)) | |
980 | return return_false_with_msg ("PHI node comparison returns false"); | |
981 | ||
982 | return result; | |
983 | } | |
984 | ||
106b5466 JH |
985 | /* Set LOCAL_P of NODE to true if DATA is non-NULL. |
986 | Helper for call_for_symbol_thunks_and_aliases. */ | |
987 | ||
988 | static bool | |
989 | set_local (cgraph_node *node, void *data) | |
990 | { | |
991 | node->local.local = data != NULL; | |
992 | return false; | |
993 | } | |
994 | ||
412049de | 995 | /* TREE_ADDRESSABLE of NODE to true. |
0a7246ee JH |
996 | Helper for call_for_symbol_thunks_and_aliases. */ |
997 | ||
998 | static bool | |
999 | set_addressable (varpool_node *node, void *) | |
1000 | { | |
1001 | TREE_ADDRESSABLE (node->decl) = 1; | |
1002 | return false; | |
1003 | } | |
1004 | ||
412049de JH |
1005 | /* Clear DECL_RTL of NODE. |
1006 | Helper for call_for_symbol_thunks_and_aliases. */ | |
1007 | ||
1008 | static bool | |
1009 | clear_decl_rtl (symtab_node *node, void *) | |
1010 | { | |
1011 | SET_DECL_RTL (node->decl, NULL); | |
1012 | return false; | |
1013 | } | |
1014 | ||
0a7246ee JH |
1015 | /* Redirect all callers of N and its aliases to TO. Remove aliases if |
1016 | possible. Return number of redirections made. */ | |
1017 | ||
1018 | static int | |
1019 | redirect_all_callers (cgraph_node *n, cgraph_node *to) | |
1020 | { | |
1021 | int nredirected = 0; | |
1022 | ipa_ref *ref; | |
17d1bf76 | 1023 | cgraph_edge *e = n->callers; |
0a7246ee | 1024 | |
17d1bf76 | 1025 | while (e) |
0a7246ee | 1026 | { |
17d1bf76 ML |
1027 | /* Redirecting thunks to interposable symbols or symbols in other sections |
1028 | may not be supported by target output code. Play safe for now and | |
1029 | punt on redirection. */ | |
1030 | if (!e->caller->thunk.thunk_p) | |
1031 | { | |
1032 | struct cgraph_edge *nexte = e->next_caller; | |
1033 | e->redirect_callee (to); | |
1034 | e = nexte; | |
1035 | nredirected++; | |
1036 | } | |
1037 | else | |
1038 | e = e->next_callee; | |
0a7246ee JH |
1039 | } |
1040 | for (unsigned i = 0; n->iterate_direct_aliases (i, ref);) | |
1041 | { | |
1042 | bool removed = false; | |
1043 | cgraph_node *n_alias = dyn_cast <cgraph_node *> (ref->referring); | |
1044 | ||
1045 | if ((DECL_COMDAT_GROUP (n->decl) | |
1046 | && (DECL_COMDAT_GROUP (n->decl) | |
1047 | == DECL_COMDAT_GROUP (n_alias->decl))) | |
1048 | || (n_alias->get_availability () > AVAIL_INTERPOSABLE | |
1049 | && n->get_availability () > AVAIL_INTERPOSABLE)) | |
1050 | { | |
1051 | nredirected += redirect_all_callers (n_alias, to); | |
1052 | if (n_alias->can_remove_if_no_direct_calls_p () | |
17d1bf76 ML |
1053 | && !n_alias->call_for_symbol_and_aliases (cgraph_node::has_thunk_p, |
1054 | NULL, true) | |
0a7246ee JH |
1055 | && !n_alias->has_aliases_p ()) |
1056 | n_alias->remove (); | |
1057 | } | |
1058 | if (!removed) | |
1059 | i++; | |
1060 | } | |
1061 | return nredirected; | |
1062 | } | |
1063 | ||
b84d4347 ML |
1064 | /* Merges instance with an ALIAS_ITEM, where alias, thunk or redirection can |
1065 | be applied. */ | |
0a7246ee | 1066 | |
b84d4347 ML |
1067 | bool |
1068 | sem_function::merge (sem_item *alias_item) | |
1069 | { | |
1070 | gcc_assert (alias_item->type == FUNC); | |
1071 | ||
1072 | sem_function *alias_func = static_cast<sem_function *> (alias_item); | |
1073 | ||
1074 | cgraph_node *original = get_node (); | |
0a7246ee | 1075 | cgraph_node *local_original = NULL; |
b84d4347 | 1076 | cgraph_node *alias = alias_func->get_node (); |
b84d4347 | 1077 | |
0a7246ee | 1078 | bool create_wrapper = false; |
b84d4347 ML |
1079 | bool create_alias = false; |
1080 | bool redirect_callers = false; | |
0a7246ee JH |
1081 | bool remove = false; |
1082 | ||
b84d4347 | 1083 | bool original_discardable = false; |
c7a06bc1 | 1084 | bool original_discarded = false; |
b84d4347 | 1085 | |
0a7246ee JH |
1086 | bool original_address_matters = original->address_matters_p (); |
1087 | bool alias_address_matters = alias->address_matters_p (); | |
1088 | ||
257291fc JH |
1089 | if (DECL_EXTERNAL (alias->decl)) |
1090 | { | |
1091 | if (dump_file) | |
1092 | fprintf (dump_file, "Not unifying; alias is external.\n\n"); | |
1093 | return false; | |
1094 | } | |
1095 | ||
0a7246ee JH |
1096 | if (DECL_NO_INLINE_WARNING_P (original->decl) |
1097 | != DECL_NO_INLINE_WARNING_P (alias->decl)) | |
1098 | { | |
1099 | if (dump_file) | |
1100 | fprintf (dump_file, | |
1101 | "Not unifying; " | |
1102 | "DECL_NO_INLINE_WARNING mismatch.\n\n"); | |
1103 | return false; | |
1104 | } | |
1105 | ||
b84d4347 ML |
1106 | /* Do not attempt to mix functions from different user sections; |
1107 | we do not know what user intends with those. */ | |
1108 | if (((DECL_SECTION_NAME (original->decl) && !original->implicit_section) | |
1109 | || (DECL_SECTION_NAME (alias->decl) && !alias->implicit_section)) | |
1110 | && DECL_SECTION_NAME (original->decl) != DECL_SECTION_NAME (alias->decl)) | |
1111 | { | |
1112 | if (dump_file) | |
1113 | fprintf (dump_file, | |
0a7246ee JH |
1114 | "Not unifying; " |
1115 | "original and alias are in different sections.\n\n"); | |
b84d4347 ML |
1116 | return false; |
1117 | } | |
1118 | ||
1119 | /* See if original is in a section that can be discarded if the main | |
c7a06bc1 | 1120 | symbol is not used. */ |
0a7246ee | 1121 | |
c7a06bc1 JH |
1122 | if (original->can_be_discarded_p ()) |
1123 | original_discardable = true; | |
1124 | /* Also consider case where we have resolution info and we know that | |
0a7246ee JH |
1125 | original's definition is not going to be used. In this case we can not |
1126 | create alias to original. */ | |
c7a06bc1 JH |
1127 | if (node->resolution != LDPR_UNKNOWN |
1128 | && !decl_binds_to_current_def_p (node->decl)) | |
1129 | original_discardable = original_discarded = true; | |
b84d4347 | 1130 | |
0a7246ee JH |
1131 | /* Creating a symtab alias is the optimal way to merge. |
1132 | It however can not be used in the following cases: | |
1133 | ||
1134 | 1) if ORIGINAL and ALIAS may be possibly compared for address equality. | |
1135 | 2) if ORIGINAL is in a section that may be discarded by linker or if | |
1136 | it is an external functions where we can not create an alias | |
1137 | (ORIGINAL_DISCARDABLE) | |
1138 | 3) if target do not support symbol aliases. | |
bbcdfb93 | 1139 | 4) original and alias lie in different comdat groups. |
0a7246ee JH |
1140 | |
1141 | If we can not produce alias, we will turn ALIAS into WRAPPER of ORIGINAL | |
1142 | and/or redirect all callers from ALIAS to ORIGINAL. */ | |
1143 | if ((original_address_matters && alias_address_matters) | |
bbcdfb93 JH |
1144 | || (original_discardable |
1145 | && (!DECL_COMDAT_GROUP (alias->decl) | |
1146 | || (DECL_COMDAT_GROUP (alias->decl) | |
1147 | != DECL_COMDAT_GROUP (original->decl)))) | |
c7a06bc1 | 1148 | || original_discarded |
bbcdfb93 JH |
1149 | || !sem_item::target_supports_symbol_aliases_p () |
1150 | || DECL_COMDAT_GROUP (alias->decl) != DECL_COMDAT_GROUP (original->decl)) | |
b84d4347 | 1151 | { |
0a7246ee JH |
1152 | /* First see if we can produce wrapper. */ |
1153 | ||
977b01e3 JH |
1154 | /* Symbol properties that matter for references must be preserved. |
1155 | TODO: We can produce wrapper, but we need to produce alias of ORIGINAL | |
1156 | with proper properties. */ | |
1157 | if (!sem_item::compare_referenced_symbol_properties (NULL, original, alias, | |
1158 | alias->address_taken)) | |
1159 | { | |
1160 | if (dump_file) | |
1161 | fprintf (dump_file, | |
1162 | "Wrapper cannot be created because referenced symbol " | |
1163 | "properties mismatch\n"); | |
1164 | } | |
0a7246ee JH |
1165 | /* Do not turn function in one comdat group into wrapper to another |
1166 | comdat group. Other compiler producing the body of the | |
1167 | another comdat group may make opossite decision and with unfortunate | |
1168 | linker choices this may close a loop. */ | |
977b01e3 JH |
1169 | else if (DECL_COMDAT_GROUP (original->decl) |
1170 | && DECL_COMDAT_GROUP (alias->decl) | |
1171 | && (DECL_COMDAT_GROUP (alias->decl) | |
1172 | != DECL_COMDAT_GROUP (original->decl))) | |
0a7246ee JH |
1173 | { |
1174 | if (dump_file) | |
1175 | fprintf (dump_file, | |
1176 | "Wrapper cannot be created because of COMDAT\n"); | |
1177 | } | |
4ebd491f EB |
1178 | else if (DECL_STATIC_CHAIN (alias->decl) |
1179 | || DECL_STATIC_CHAIN (original->decl)) | |
0a7246ee JH |
1180 | { |
1181 | if (dump_file) | |
1182 | fprintf (dump_file, | |
4ebd491f | 1183 | "Cannot create wrapper of nested function.\n"); |
0a7246ee JH |
1184 | } |
1185 | /* TODO: We can also deal with variadic functions never calling | |
1186 | VA_START. */ | |
1187 | else if (stdarg_p (TREE_TYPE (alias->decl))) | |
1188 | { | |
1189 | if (dump_file) | |
1190 | fprintf (dump_file, | |
1191 | "can not create wrapper of stdarg function.\n"); | |
1192 | } | |
0bceb671 JH |
1193 | else if (ipa_fn_summaries |
1194 | && ipa_fn_summaries->get (alias)->self_size <= 2) | |
0a7246ee JH |
1195 | { |
1196 | if (dump_file) | |
1197 | fprintf (dump_file, "Wrapper creation is not " | |
1198 | "profitable (function is too small).\n"); | |
1199 | } | |
1200 | /* If user paid attention to mark function noinline, assume it is | |
1201 | somewhat special and do not try to turn it into a wrapper that can | |
1202 | not be undone by inliner. */ | |
1203 | else if (lookup_attribute ("noinline", DECL_ATTRIBUTES (alias->decl))) | |
1204 | { | |
1205 | if (dump_file) | |
1206 | fprintf (dump_file, "Wrappers are not created for noinline.\n"); | |
1207 | } | |
1208 | else | |
1209 | create_wrapper = true; | |
1210 | ||
1211 | /* We can redirect local calls in the case both alias and orignal | |
1212 | are not interposable. */ | |
b84d4347 | 1213 | redirect_callers |
0a7246ee JH |
1214 | = alias->get_availability () > AVAIL_INTERPOSABLE |
1215 | && original->get_availability () > AVAIL_INTERPOSABLE | |
1216 | && !alias->instrumented_version; | |
977b01e3 JH |
1217 | /* TODO: We can redirect, but we need to produce alias of ORIGINAL |
1218 | with proper properties. */ | |
1219 | if (!sem_item::compare_referenced_symbol_properties (NULL, original, alias, | |
1220 | alias->address_taken)) | |
1221 | redirect_callers = false; | |
b84d4347 | 1222 | |
0a7246ee JH |
1223 | if (!redirect_callers && !create_wrapper) |
1224 | { | |
1225 | if (dump_file) | |
1226 | fprintf (dump_file, "Not unifying; can not redirect callers nor " | |
1227 | "produce wrapper\n\n"); | |
1228 | return false; | |
1229 | } | |
1230 | ||
1231 | /* Work out the symbol the wrapper should call. | |
1232 | If ORIGINAL is interposable, we need to call a local alias. | |
c7a06bc1 JH |
1233 | Also produce local alias (if possible) as an optimization. |
1234 | ||
1235 | Local aliases can not be created inside comdat groups because that | |
1236 | prevents inlining. */ | |
1237 | if (!original_discardable && !original->get_comdat_group ()) | |
0a7246ee JH |
1238 | { |
1239 | local_original | |
1240 | = dyn_cast <cgraph_node *> (original->noninterposable_alias ()); | |
1241 | if (!local_original | |
1242 | && original->get_availability () > AVAIL_INTERPOSABLE) | |
1243 | local_original = original; | |
0a7246ee JH |
1244 | } |
1245 | /* If we can not use local alias, fallback to the original | |
1246 | when possible. */ | |
1247 | else if (original->get_availability () > AVAIL_INTERPOSABLE) | |
1248 | local_original = original; | |
c7a06bc1 JH |
1249 | |
1250 | /* If original is COMDAT local, we can not really redirect calls outside | |
1251 | of its comdat group to it. */ | |
1252 | if (original->comdat_local_p ()) | |
1253 | redirect_callers = false; | |
0a7246ee JH |
1254 | if (!local_original) |
1255 | { | |
1256 | if (dump_file) | |
1257 | fprintf (dump_file, "Not unifying; " | |
1258 | "can not produce local alias.\n\n"); | |
1259 | return false; | |
1260 | } | |
f657d665 | 1261 | |
0a7246ee JH |
1262 | if (!redirect_callers && !create_wrapper) |
1263 | { | |
1264 | if (dump_file) | |
1265 | fprintf (dump_file, "Not unifying; " | |
1266 | "can not redirect callers nor produce a wrapper\n\n"); | |
1267 | return false; | |
1268 | } | |
1269 | if (!create_wrapper | |
17d1bf76 ML |
1270 | && !alias->call_for_symbol_and_aliases (cgraph_node::has_thunk_p, |
1271 | NULL, true) | |
0a7246ee JH |
1272 | && !alias->can_remove_if_no_direct_calls_p ()) |
1273 | { | |
1274 | if (dump_file) | |
1275 | fprintf (dump_file, "Not unifying; can not make wrapper and " | |
1276 | "function has other uses than direct calls\n\n"); | |
1277 | return false; | |
1278 | } | |
544dafa6 | 1279 | } |
0a7246ee JH |
1280 | else |
1281 | create_alias = true; | |
544dafa6 | 1282 | |
b84d4347 ML |
1283 | if (redirect_callers) |
1284 | { | |
0a7246ee | 1285 | int nredirected = redirect_all_callers (alias, local_original); |
b84d4347 | 1286 | |
0a7246ee JH |
1287 | if (nredirected) |
1288 | { | |
1289 | alias->icf_merged = true; | |
1290 | local_original->icf_merged = true; | |
b84d4347 | 1291 | |
0a7246ee JH |
1292 | if (dump_file && nredirected) |
1293 | fprintf (dump_file, "%i local calls have been " | |
1294 | "redirected.\n", nredirected); | |
b84d4347 ML |
1295 | } |
1296 | ||
0a7246ee JH |
1297 | /* If all callers was redirected, do not produce wrapper. */ |
1298 | if (alias->can_remove_if_no_direct_calls_p () | |
824ca15e | 1299 | && !DECL_VIRTUAL_P (alias->decl) |
0a7246ee JH |
1300 | && !alias->has_aliases_p ()) |
1301 | { | |
1302 | create_wrapper = false; | |
1303 | remove = true; | |
1304 | } | |
1305 | gcc_assert (!create_alias); | |
b84d4347 | 1306 | } |
b84d4347 ML |
1307 | else if (create_alias) |
1308 | { | |
1309 | alias->icf_merged = true; | |
1310 | ||
1311 | /* Remove the function's body. */ | |
1312 | ipa_merge_profiles (original, alias); | |
1313 | alias->release_body (true); | |
1314 | alias->reset (); | |
412049de JH |
1315 | /* Notice global symbol possibly produced RTL. */ |
1316 | ((symtab_node *)alias)->call_for_symbol_and_aliases (clear_decl_rtl, | |
1317 | NULL, true); | |
b84d4347 ML |
1318 | |
1319 | /* Create the alias. */ | |
1320 | cgraph_node::create_alias (alias_func->decl, decl); | |
1321 | alias->resolve_alias (original); | |
1322 | ||
106b5466 JH |
1323 | original->call_for_symbol_thunks_and_aliases |
1324 | (set_local, (void *)(size_t) original->local_p (), true); | |
9d4ded75 | 1325 | |
b84d4347 | 1326 | if (dump_file) |
0a7246ee | 1327 | fprintf (dump_file, "Unified; Function alias has been created.\n\n"); |
b84d4347 | 1328 | } |
0a7246ee | 1329 | if (create_wrapper) |
b84d4347 | 1330 | { |
0a7246ee JH |
1331 | gcc_assert (!create_alias); |
1332 | alias->icf_merged = true; | |
1333 | local_original->icf_merged = true; | |
b84d4347 | 1334 | |
0a7246ee JH |
1335 | ipa_merge_profiles (local_original, alias, true); |
1336 | alias->create_wrapper (local_original); | |
b84d4347 | 1337 | |
0a7246ee JH |
1338 | if (dump_file) |
1339 | fprintf (dump_file, "Unified; Wrapper has been created.\n\n"); | |
1340 | } | |
17d1bf76 ML |
1341 | |
1342 | /* It's possible that redirection can hit thunks that block | |
1343 | redirection opportunities. */ | |
1344 | gcc_assert (alias->icf_merged || remove || redirect_callers); | |
0a7246ee | 1345 | original->icf_merged = true; |
34b42fb0 | 1346 | |
88636b62 JH |
1347 | /* We use merged flag to track cases where COMDAT function is known to be |
1348 | compatible its callers. If we merged in non-COMDAT, we need to give up | |
1349 | on this optimization. */ | |
1350 | if (original->merged_comdat && !alias->merged_comdat) | |
1351 | { | |
1352 | if (dump_file) | |
1353 | fprintf (dump_file, "Dropping merged_comdat flag.\n\n"); | |
e9e70798 JH |
1354 | if (local_original) |
1355 | local_original->merged_comdat = false; | |
1356 | original->merged_comdat = false; | |
88636b62 | 1357 | } |
34b42fb0 | 1358 | |
0a7246ee JH |
1359 | if (remove) |
1360 | { | |
1361 | ipa_merge_profiles (original, alias); | |
1362 | alias->release_body (); | |
1363 | alias->reset (); | |
1364 | alias->body_removed = true; | |
b84d4347 | 1365 | alias->icf_merged = true; |
b84d4347 | 1366 | if (dump_file) |
0a7246ee | 1367 | fprintf (dump_file, "Unified; Function body was removed.\n"); |
b84d4347 | 1368 | } |
b84d4347 ML |
1369 | |
1370 | return true; | |
1371 | } | |
1372 | ||
1373 | /* Semantic item initialization function. */ | |
1374 | ||
1375 | void | |
1376 | sem_function::init (void) | |
1377 | { | |
1378 | if (in_lto_p) | |
70486010 | 1379 | get_node ()->get_untransformed_body (); |
b84d4347 ML |
1380 | |
1381 | tree fndecl = node->decl; | |
1382 | function *func = DECL_STRUCT_FUNCTION (fndecl); | |
1383 | ||
1384 | gcc_assert (func); | |
1385 | gcc_assert (SSANAMES (func)); | |
1386 | ||
1387 | ssa_names_size = SSANAMES (func)->length (); | |
1388 | node = node; | |
1389 | ||
1390 | decl = fndecl; | |
1391 | region_tree = func->eh->region_tree; | |
1392 | ||
1393 | /* iterating all function arguments. */ | |
1394 | arg_count = count_formal_params (fndecl); | |
1395 | ||
1396 | edge_count = n_edges_for_fn (func); | |
fb5c322e JH |
1397 | cgraph_node *cnode = dyn_cast <cgraph_node *> (node); |
1398 | if (!cnode->thunk.thunk_p) | |
1399 | { | |
1400 | cfg_checksum = coverage_compute_cfg_checksum (func); | |
b84d4347 | 1401 | |
fb5c322e | 1402 | inchash::hash hstate; |
b84d4347 | 1403 | |
fb5c322e JH |
1404 | basic_block bb; |
1405 | FOR_EACH_BB_FN (bb, func) | |
b84d4347 | 1406 | { |
fb5c322e | 1407 | unsigned nondbg_stmt_count = 0; |
b84d4347 | 1408 | |
fb5c322e JH |
1409 | edge e; |
1410 | for (edge_iterator ei = ei_start (bb->preds); ei_cond (ei, &e); | |
1411 | ei_next (&ei)) | |
1412 | cfg_checksum = iterative_hash_host_wide_int (e->flags, | |
1413 | cfg_checksum); | |
1414 | ||
1415 | for (gimple_stmt_iterator gsi = gsi_start_bb (bb); !gsi_end_p (gsi); | |
1416 | gsi_next (&gsi)) | |
b84d4347 | 1417 | { |
355fe088 | 1418 | gimple *stmt = gsi_stmt (gsi); |
fb5c322e JH |
1419 | |
1420 | if (gimple_code (stmt) != GIMPLE_DEBUG | |
1421 | && gimple_code (stmt) != GIMPLE_PREDICT) | |
1422 | { | |
1423 | hash_stmt (stmt, hstate); | |
1424 | nondbg_stmt_count++; | |
1425 | } | |
b84d4347 | 1426 | } |
b84d4347 | 1427 | |
fb5c322e JH |
1428 | gcode_hash = hstate.end (); |
1429 | bb_sizes.safe_push (nondbg_stmt_count); | |
b84d4347 | 1430 | |
fb5c322e JH |
1431 | /* Inserting basic block to hash table. */ |
1432 | sem_bb *semantic_bb = new sem_bb (bb, nondbg_stmt_count, | |
1433 | EDGE_COUNT (bb->preds) | |
1434 | + EDGE_COUNT (bb->succs)); | |
b84d4347 | 1435 | |
fb5c322e JH |
1436 | bb_sorted.safe_push (semantic_bb); |
1437 | } | |
1438 | } | |
1439 | else | |
1440 | { | |
1441 | cfg_checksum = 0; | |
1442 | inchash::hash hstate; | |
1443 | hstate.add_wide_int (cnode->thunk.fixed_offset); | |
1444 | hstate.add_wide_int (cnode->thunk.virtual_value); | |
1445 | hstate.add_flag (cnode->thunk.this_adjusting); | |
1446 | hstate.add_flag (cnode->thunk.virtual_offset_p); | |
1447 | hstate.add_flag (cnode->thunk.add_pointer_bounds_args); | |
1448 | gcode_hash = hstate.end (); | |
1449 | } | |
b84d4347 ML |
1450 | } |
1451 | ||
a8d93817 JH |
1452 | /* Accumulate to HSTATE a hash of expression EXP. |
1453 | Identical to inchash::add_expr, but guaranteed to be stable across LTO | |
1454 | and DECL equality classes. */ | |
1455 | ||
1456 | void | |
1457 | sem_item::add_expr (const_tree exp, inchash::hash &hstate) | |
1458 | { | |
1459 | if (exp == NULL_TREE) | |
1460 | { | |
1461 | hstate.merge_hash (0); | |
1462 | return; | |
1463 | } | |
1464 | ||
1465 | /* Handled component can be matched in a cureful way proving equivalence | |
1466 | even if they syntactically differ. Just skip them. */ | |
1467 | STRIP_NOPS (exp); | |
1468 | while (handled_component_p (exp)) | |
1469 | exp = TREE_OPERAND (exp, 0); | |
1470 | ||
1471 | enum tree_code code = TREE_CODE (exp); | |
1472 | hstate.add_int (code); | |
1473 | ||
1474 | switch (code) | |
1475 | { | |
1476 | /* Use inchash::add_expr for everything that is LTO stable. */ | |
1477 | case VOID_CST: | |
1478 | case INTEGER_CST: | |
1479 | case REAL_CST: | |
1480 | case FIXED_CST: | |
1481 | case STRING_CST: | |
1482 | case COMPLEX_CST: | |
1483 | case VECTOR_CST: | |
1484 | inchash::add_expr (exp, hstate); | |
1485 | break; | |
1486 | case CONSTRUCTOR: | |
1487 | { | |
1488 | unsigned HOST_WIDE_INT idx; | |
1489 | tree value; | |
1490 | ||
1491 | hstate.add_wide_int (int_size_in_bytes (TREE_TYPE (exp))); | |
1492 | ||
1493 | FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value) | |
1494 | if (value) | |
1495 | add_expr (value, hstate); | |
1496 | break; | |
1497 | } | |
1498 | case ADDR_EXPR: | |
1499 | case FDESC_EXPR: | |
1500 | add_expr (get_base_address (TREE_OPERAND (exp, 0)), hstate); | |
1501 | break; | |
1502 | case SSA_NAME: | |
1503 | case VAR_DECL: | |
1504 | case CONST_DECL: | |
1505 | case PARM_DECL: | |
1506 | hstate.add_wide_int (int_size_in_bytes (TREE_TYPE (exp))); | |
1507 | break; | |
1508 | case MEM_REF: | |
1509 | case POINTER_PLUS_EXPR: | |
1510 | case MINUS_EXPR: | |
1511 | case RANGE_EXPR: | |
1512 | add_expr (TREE_OPERAND (exp, 0), hstate); | |
1513 | add_expr (TREE_OPERAND (exp, 1), hstate); | |
1514 | break; | |
1515 | case PLUS_EXPR: | |
1516 | { | |
1517 | inchash::hash one, two; | |
1518 | add_expr (TREE_OPERAND (exp, 0), one); | |
1519 | add_expr (TREE_OPERAND (exp, 1), two); | |
1520 | hstate.add_commutative (one, two); | |
1521 | } | |
1522 | break; | |
1523 | CASE_CONVERT: | |
1524 | hstate.add_wide_int (int_size_in_bytes (TREE_TYPE (exp))); | |
1525 | return add_expr (TREE_OPERAND (exp, 0), hstate); | |
1526 | default: | |
1527 | break; | |
1528 | } | |
1529 | } | |
1530 | ||
69f6b1f4 JH |
1531 | /* Accumulate to HSTATE a hash of type t. |
1532 | TYpes that may end up being compatible after LTO type merging needs to have | |
1533 | the same hash. */ | |
1534 | ||
1535 | void | |
1536 | sem_item::add_type (const_tree type, inchash::hash &hstate) | |
1537 | { | |
1538 | if (type == NULL_TREE) | |
1539 | { | |
1540 | hstate.merge_hash (0); | |
1541 | return; | |
1542 | } | |
1543 | ||
1544 | type = TYPE_MAIN_VARIANT (type); | |
69f6b1f4 | 1545 | |
5e83f17d | 1546 | hstate.add_int (TYPE_MODE (type)); |
69f6b1f4 JH |
1547 | |
1548 | if (TREE_CODE (type) == COMPLEX_TYPE) | |
1549 | { | |
1550 | hstate.add_int (COMPLEX_TYPE); | |
1551 | sem_item::add_type (TREE_TYPE (type), hstate); | |
1552 | } | |
1553 | else if (INTEGRAL_TYPE_P (type)) | |
1554 | { | |
1555 | hstate.add_int (INTEGER_TYPE); | |
1556 | hstate.add_flag (TYPE_UNSIGNED (type)); | |
1557 | hstate.add_int (TYPE_PRECISION (type)); | |
1558 | } | |
1559 | else if (VECTOR_TYPE_P (type)) | |
1560 | { | |
1561 | hstate.add_int (VECTOR_TYPE); | |
1562 | hstate.add_int (TYPE_PRECISION (type)); | |
1563 | sem_item::add_type (TREE_TYPE (type), hstate); | |
1564 | } | |
1565 | else if (TREE_CODE (type) == ARRAY_TYPE) | |
1566 | { | |
1567 | hstate.add_int (ARRAY_TYPE); | |
1568 | /* Do not hash size, so complete and incomplete types can match. */ | |
1569 | sem_item::add_type (TREE_TYPE (type), hstate); | |
1570 | } | |
1571 | else if (RECORD_OR_UNION_TYPE_P (type)) | |
1572 | { | |
5e83f17d | 1573 | gcc_checking_assert (COMPLETE_TYPE_P (type)); |
69f6b1f4 JH |
1574 | hashval_t *val = optimizer->m_type_hash_cache.get (type); |
1575 | ||
1576 | if (!val) | |
1577 | { | |
1578 | inchash::hash hstate2; | |
1579 | unsigned nf; | |
1580 | tree f; | |
1581 | hashval_t hash; | |
1582 | ||
1583 | hstate2.add_int (RECORD_TYPE); | |
1584 | gcc_assert (COMPLETE_TYPE_P (type)); | |
1585 | ||
1586 | for (f = TYPE_FIELDS (type), nf = 0; f; f = TREE_CHAIN (f)) | |
1587 | if (TREE_CODE (f) == FIELD_DECL) | |
1588 | { | |
1589 | add_type (TREE_TYPE (f), hstate2); | |
1590 | nf++; | |
1591 | } | |
1592 | ||
1593 | hstate2.add_int (nf); | |
1594 | hash = hstate2.end (); | |
1595 | hstate.add_wide_int (hash); | |
1596 | optimizer->m_type_hash_cache.put (type, hash); | |
1597 | } | |
1598 | else | |
1599 | hstate.add_wide_int (*val); | |
1600 | } | |
1601 | } | |
1602 | ||
b84d4347 ML |
1603 | /* Improve accumulated hash for HSTATE based on a gimple statement STMT. */ |
1604 | ||
1605 | void | |
355fe088 | 1606 | sem_function::hash_stmt (gimple *stmt, inchash::hash &hstate) |
b84d4347 ML |
1607 | { |
1608 | enum gimple_code code = gimple_code (stmt); | |
1609 | ||
a8d93817 | 1610 | hstate.add_int (code); |
b84d4347 | 1611 | |
a8d93817 | 1612 | switch (code) |
b84d4347 | 1613 | { |
69f6b1f4 JH |
1614 | case GIMPLE_SWITCH: |
1615 | add_expr (gimple_switch_index (as_a <gswitch *> (stmt)), hstate); | |
1616 | break; | |
a8d93817 | 1617 | case GIMPLE_ASSIGN: |
69f6b1f4 | 1618 | hstate.add_int (gimple_assign_rhs_code (stmt)); |
a8d93817 JH |
1619 | if (commutative_tree_code (gimple_assign_rhs_code (stmt)) |
1620 | || commutative_ternary_tree_code (gimple_assign_rhs_code (stmt))) | |
b84d4347 | 1621 | { |
a8d93817 | 1622 | inchash::hash one, two; |
b84d4347 | 1623 | |
a8d93817 | 1624 | add_expr (gimple_assign_rhs1 (stmt), one); |
69f6b1f4 | 1625 | add_type (TREE_TYPE (gimple_assign_rhs1 (stmt)), one); |
a8d93817 JH |
1626 | add_expr (gimple_assign_rhs2 (stmt), two); |
1627 | hstate.add_commutative (one, two); | |
69f6b1f4 JH |
1628 | if (commutative_ternary_tree_code (gimple_assign_rhs_code (stmt))) |
1629 | { | |
1630 | add_expr (gimple_assign_rhs3 (stmt), hstate); | |
1631 | add_type (TREE_TYPE (gimple_assign_rhs3 (stmt)), hstate); | |
1632 | } | |
a8d93817 | 1633 | add_expr (gimple_assign_lhs (stmt), hstate); |
69f6b1f4 | 1634 | add_type (TREE_TYPE (gimple_assign_lhs (stmt)), two); |
a8d93817 | 1635 | break; |
b84d4347 | 1636 | } |
191816a3 | 1637 | /* fall through */ |
a8d93817 JH |
1638 | case GIMPLE_CALL: |
1639 | case GIMPLE_ASM: | |
1640 | case GIMPLE_COND: | |
1641 | case GIMPLE_GOTO: | |
1642 | case GIMPLE_RETURN: | |
1643 | /* All these statements are equivalent if their operands are. */ | |
1644 | for (unsigned i = 0; i < gimple_num_ops (stmt); ++i) | |
69f6b1f4 JH |
1645 | { |
1646 | add_expr (gimple_op (stmt, i), hstate); | |
1647 | if (gimple_op (stmt, i)) | |
1648 | add_type (TREE_TYPE (gimple_op (stmt, i)), hstate); | |
1649 | } | |
a8d93817 JH |
1650 | default: |
1651 | break; | |
b84d4347 ML |
1652 | } |
1653 | } | |
1654 | ||
1655 | ||
1656 | /* Return true if polymorphic comparison must be processed. */ | |
1657 | ||
1658 | bool | |
1659 | sem_function::compare_polymorphic_p (void) | |
1660 | { | |
060cfff4 JH |
1661 | struct cgraph_edge *e; |
1662 | ||
69f6b1f4 | 1663 | if (!opt_for_fn (get_node ()->decl, flag_devirtualize)) |
060cfff4 | 1664 | return false; |
69f6b1f4 | 1665 | if (get_node ()->indirect_calls != NULL) |
060cfff4 JH |
1666 | return true; |
1667 | /* TODO: We can do simple propagation determining what calls may lead to | |
1668 | a polymorphic call. */ | |
69f6b1f4 | 1669 | for (e = get_node ()->callees; e; e = e->next_callee) |
060cfff4 JH |
1670 | if (e->callee->definition |
1671 | && opt_for_fn (e->callee->decl, flag_devirtualize)) | |
1672 | return true; | |
1673 | return false; | |
b84d4347 ML |
1674 | } |
1675 | ||
1676 | /* For a given call graph NODE, the function constructs new | |
1677 | semantic function item. */ | |
1678 | ||
1679 | sem_function * | |
1680 | sem_function::parse (cgraph_node *node, bitmap_obstack *stack) | |
1681 | { | |
1682 | tree fndecl = node->decl; | |
1683 | function *func = DECL_STRUCT_FUNCTION (fndecl); | |
1684 | ||
fb5c322e | 1685 | if (!func || (!node->has_gimple_body_p () && !node->thunk.thunk_p)) |
b84d4347 ML |
1686 | return NULL; |
1687 | ||
1688 | if (lookup_attribute_by_prefix ("omp ", DECL_ATTRIBUTES (node->decl)) != NULL) | |
1689 | return NULL; | |
1690 | ||
97ad3aef CP |
1691 | if (lookup_attribute_by_prefix ("oacc ", |
1692 | DECL_ATTRIBUTES (node->decl)) != NULL) | |
1693 | return NULL; | |
1694 | ||
2a85ddbb ML |
1695 | /* PR ipa/70306. */ |
1696 | if (DECL_STATIC_CONSTRUCTOR (node->decl) | |
1697 | || DECL_STATIC_DESTRUCTOR (node->decl)) | |
1698 | return NULL; | |
1699 | ||
fedf2718 | 1700 | sem_function *f = new sem_function (node, stack); |
b84d4347 ML |
1701 | |
1702 | f->init (); | |
1703 | ||
1704 | return f; | |
1705 | } | |
1706 | ||
b84d4347 ML |
1707 | /* For given basic blocks BB1 and BB2 (from functions FUNC1 and FUNC), |
1708 | return true if phi nodes are semantically equivalent in these blocks . */ | |
1709 | ||
1710 | bool | |
1711 | sem_function::compare_phi_node (basic_block bb1, basic_block bb2) | |
1712 | { | |
538dd0b7 DM |
1713 | gphi_iterator si1, si2; |
1714 | gphi *phi1, *phi2; | |
b84d4347 ML |
1715 | unsigned size1, size2, i; |
1716 | tree t1, t2; | |
1717 | edge e1, e2; | |
1718 | ||
1719 | gcc_assert (bb1 != NULL); | |
1720 | gcc_assert (bb2 != NULL); | |
1721 | ||
1722 | si2 = gsi_start_phis (bb2); | |
1723 | for (si1 = gsi_start_phis (bb1); !gsi_end_p (si1); | |
1724 | gsi_next (&si1)) | |
1725 | { | |
1726 | gsi_next_nonvirtual_phi (&si1); | |
1727 | gsi_next_nonvirtual_phi (&si2); | |
1728 | ||
1729 | if (gsi_end_p (si1) && gsi_end_p (si2)) | |
1730 | break; | |
1731 | ||
1732 | if (gsi_end_p (si1) || gsi_end_p (si2)) | |
1733 | return return_false(); | |
1734 | ||
538dd0b7 DM |
1735 | phi1 = si1.phi (); |
1736 | phi2 = si2.phi (); | |
b84d4347 | 1737 | |
59f084e0 ML |
1738 | tree phi_result1 = gimple_phi_result (phi1); |
1739 | tree phi_result2 = gimple_phi_result (phi2); | |
1740 | ||
1741 | if (!m_checker->compare_operand (phi_result1, phi_result2)) | |
1742 | return return_false_with_msg ("PHI results are different"); | |
1743 | ||
b84d4347 ML |
1744 | size1 = gimple_phi_num_args (phi1); |
1745 | size2 = gimple_phi_num_args (phi2); | |
1746 | ||
1747 | if (size1 != size2) | |
1748 | return return_false (); | |
1749 | ||
1750 | for (i = 0; i < size1; ++i) | |
1751 | { | |
1752 | t1 = gimple_phi_arg (phi1, i)->def; | |
1753 | t2 = gimple_phi_arg (phi2, i)->def; | |
1754 | ||
1755 | if (!m_checker->compare_operand (t1, t2)) | |
1756 | return return_false (); | |
1757 | ||
1758 | e1 = gimple_phi_arg_edge (phi1, i); | |
1759 | e2 = gimple_phi_arg_edge (phi2, i); | |
1760 | ||
1761 | if (!m_checker->compare_edge (e1, e2)) | |
1762 | return return_false (); | |
1763 | } | |
1764 | ||
1765 | gsi_next (&si2); | |
1766 | } | |
1767 | ||
1768 | return true; | |
1769 | } | |
1770 | ||
1771 | /* Returns true if tree T can be compared as a handled component. */ | |
1772 | ||
1773 | bool | |
1774 | sem_function::icf_handled_component_p (tree t) | |
1775 | { | |
1776 | tree_code tc = TREE_CODE (t); | |
1777 | ||
e5115cf9 EB |
1778 | return (handled_component_p (t) |
1779 | || tc == ADDR_EXPR || tc == MEM_REF || tc == OBJ_TYPE_REF); | |
b84d4347 ML |
1780 | } |
1781 | ||
1782 | /* Basic blocks dictionary BB_DICT returns true if SOURCE index BB | |
1783 | corresponds to TARGET. */ | |
1784 | ||
1785 | bool | |
1216ea72 | 1786 | sem_function::bb_dict_test (vec<int> *bb_dict, int source, int target) |
b84d4347 | 1787 | { |
c190efcc ML |
1788 | source++; |
1789 | target++; | |
1790 | ||
1216ea72 TS |
1791 | if (bb_dict->length () <= (unsigned)source) |
1792 | bb_dict->safe_grow_cleared (source + 1); | |
c190efcc | 1793 | |
1216ea72 | 1794 | if ((*bb_dict)[source] == 0) |
b84d4347 | 1795 | { |
1216ea72 | 1796 | (*bb_dict)[source] = target; |
b84d4347 ML |
1797 | return true; |
1798 | } | |
1799 | else | |
1216ea72 | 1800 | return (*bb_dict)[source] == target; |
b84d4347 ML |
1801 | } |
1802 | ||
b84d4347 ML |
1803 | sem_variable::sem_variable (bitmap_obstack *stack): sem_item (VAR, stack) |
1804 | { | |
1805 | } | |
1806 | ||
fedf2718 ML |
1807 | sem_variable::sem_variable (varpool_node *node, bitmap_obstack *stack) |
1808 | : sem_item (VAR, node, stack) | |
b84d4347 ML |
1809 | { |
1810 | gcc_checking_assert (node); | |
1811 | gcc_checking_assert (get_node ()); | |
1812 | } | |
1813 | ||
46305737 JH |
1814 | /* Fast equality function based on knowledge known in WPA. */ |
1815 | ||
1816 | bool | |
1817 | sem_variable::equals_wpa (sem_item *item, | |
1818 | hash_map <symtab_node *, sem_item *> &ignored_nodes) | |
1819 | { | |
1820 | gcc_assert (item->type == VAR); | |
1821 | ||
1822 | if (node->num_references () != item->node->num_references ()) | |
1823 | return return_false_with_msg ("different number of references"); | |
1824 | ||
1825 | if (DECL_TLS_MODEL (decl) || DECL_TLS_MODEL (item->decl)) | |
1826 | return return_false_with_msg ("TLS model"); | |
1827 | ||
b3587b99 JH |
1828 | /* DECL_ALIGN is safe to merge, because we will always chose the largest |
1829 | alignment out of all aliases. */ | |
46305737 JH |
1830 | |
1831 | if (DECL_VIRTUAL_P (decl) != DECL_VIRTUAL_P (item->decl)) | |
1832 | return return_false_with_msg ("Virtual flag mismatch"); | |
1833 | ||
1834 | if (DECL_SIZE (decl) != DECL_SIZE (item->decl) | |
1835 | && ((!DECL_SIZE (decl) || !DECL_SIZE (item->decl)) | |
1836 | || !operand_equal_p (DECL_SIZE (decl), | |
1837 | DECL_SIZE (item->decl), OEP_ONLY_CONST))) | |
1838 | return return_false_with_msg ("size mismatch"); | |
1839 | ||
1840 | /* Do not attempt to mix data from different user sections; | |
1841 | we do not know what user intends with those. */ | |
1842 | if (((DECL_SECTION_NAME (decl) && !node->implicit_section) | |
1843 | || (DECL_SECTION_NAME (item->decl) && !item->node->implicit_section)) | |
1844 | && DECL_SECTION_NAME (decl) != DECL_SECTION_NAME (item->decl)) | |
1845 | return return_false_with_msg ("user section mismatch"); | |
1846 | ||
1847 | if (DECL_IN_TEXT_SECTION (decl) != DECL_IN_TEXT_SECTION (item->decl)) | |
1848 | return return_false_with_msg ("text section"); | |
1849 | ||
1850 | ipa_ref *ref = NULL, *ref2 = NULL; | |
1851 | for (unsigned i = 0; node->iterate_reference (i, ref); i++) | |
1852 | { | |
1853 | item->node->iterate_reference (i, ref2); | |
1854 | ||
b3587b99 JH |
1855 | if (ref->use != ref2->use) |
1856 | return return_false_with_msg ("reference use mismatch"); | |
1857 | ||
977b01e3 | 1858 | if (!compare_symbol_references (ignored_nodes, |
46305737 JH |
1859 | ref->referred, ref2->referred, |
1860 | ref->address_matters_p ())) | |
1861 | return false; | |
1862 | } | |
1863 | ||
1864 | return true; | |
1865 | } | |
1866 | ||
b84d4347 | 1867 | /* Returns true if the item equals to ITEM given as argument. */ |
c4c0f336 | 1868 | |
b84d4347 ML |
1869 | bool |
1870 | sem_variable::equals (sem_item *item, | |
c4c0f336 | 1871 | hash_map <symtab_node *, sem_item *> &) |
b84d4347 ML |
1872 | { |
1873 | gcc_assert (item->type == VAR); | |
c4c0f336 | 1874 | bool ret; |
b84d4347 | 1875 | |
c4c0f336 ML |
1876 | if (DECL_INITIAL (decl) == error_mark_node && in_lto_p) |
1877 | dyn_cast <varpool_node *>(node)->get_constructor (); | |
1878 | if (DECL_INITIAL (item->decl) == error_mark_node && in_lto_p) | |
1879 | dyn_cast <varpool_node *>(item->node)->get_constructor (); | |
b84d4347 | 1880 | |
9374ef82 ML |
1881 | /* As seen in PR ipa/65303 we have to compare variables types. */ |
1882 | if (!func_checker::compatible_types_p (TREE_TYPE (decl), | |
1883 | TREE_TYPE (item->decl))) | |
1884 | return return_false_with_msg ("variables types are different"); | |
1885 | ||
c4c0f336 ML |
1886 | ret = sem_variable::equals (DECL_INITIAL (decl), |
1887 | DECL_INITIAL (item->node->decl)); | |
1888 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
1889 | fprintf (dump_file, | |
1890 | "Equals called for vars:%s:%s (%u:%u) (%s:%s) with result: %s\n\n", | |
1aec2ecc ML |
1891 | xstrdup_for_dump (node->name()), |
1892 | xstrdup_for_dump (item->node->name ()), | |
1893 | node->order, item->node->order, | |
1894 | xstrdup_for_dump (node->asm_name ()), | |
1895 | xstrdup_for_dump (item->node->asm_name ()), ret ? "true" : "false"); | |
b84d4347 | 1896 | |
c4c0f336 | 1897 | return ret; |
b84d4347 ML |
1898 | } |
1899 | ||
1900 | /* Compares trees T1 and T2 for semantic equality. */ | |
1901 | ||
1902 | bool | |
1903 | sem_variable::equals (tree t1, tree t2) | |
1904 | { | |
46305737 JH |
1905 | if (!t1 || !t2) |
1906 | return return_with_debug (t1 == t2); | |
1907 | if (t1 == t2) | |
1908 | return true; | |
b84d4347 ML |
1909 | tree_code tc1 = TREE_CODE (t1); |
1910 | tree_code tc2 = TREE_CODE (t2); | |
1911 | ||
1912 | if (tc1 != tc2) | |
46305737 | 1913 | return return_false_with_msg ("TREE_CODE mismatch"); |
b84d4347 ML |
1914 | |
1915 | switch (tc1) | |
1916 | { | |
1917 | case CONSTRUCTOR: | |
1918 | { | |
46305737 JH |
1919 | vec<constructor_elt, va_gc> *v1, *v2; |
1920 | unsigned HOST_WIDE_INT idx; | |
b84d4347 | 1921 | |
46305737 JH |
1922 | enum tree_code typecode = TREE_CODE (TREE_TYPE (t1)); |
1923 | if (typecode != TREE_CODE (TREE_TYPE (t2))) | |
1924 | return return_false_with_msg ("constructor type mismatch"); | |
b84d4347 | 1925 | |
46305737 JH |
1926 | if (typecode == ARRAY_TYPE) |
1927 | { | |
1928 | HOST_WIDE_INT size_1 = int_size_in_bytes (TREE_TYPE (t1)); | |
1929 | /* For arrays, check that the sizes all match. */ | |
1930 | if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)) | |
1931 | || size_1 == -1 | |
1932 | || size_1 != int_size_in_bytes (TREE_TYPE (t2))) | |
1933 | return return_false_with_msg ("constructor array size mismatch"); | |
1934 | } | |
1935 | else if (!func_checker::compatible_types_p (TREE_TYPE (t1), | |
1936 | TREE_TYPE (t2))) | |
1937 | return return_false_with_msg ("constructor type incompatible"); | |
b84d4347 | 1938 | |
46305737 JH |
1939 | v1 = CONSTRUCTOR_ELTS (t1); |
1940 | v2 = CONSTRUCTOR_ELTS (t2); | |
1941 | if (vec_safe_length (v1) != vec_safe_length (v2)) | |
1942 | return return_false_with_msg ("constructor number of elts mismatch"); | |
1943 | ||
1944 | for (idx = 0; idx < vec_safe_length (v1); ++idx) | |
1945 | { | |
1946 | constructor_elt *c1 = &(*v1)[idx]; | |
1947 | constructor_elt *c2 = &(*v2)[idx]; | |
1948 | ||
1949 | /* Check that each value is the same... */ | |
1950 | if (!sem_variable::equals (c1->value, c2->value)) | |
1951 | return false; | |
1952 | /* ... and that they apply to the same fields! */ | |
1953 | if (!sem_variable::equals (c1->index, c2->index)) | |
1954 | return false; | |
1955 | } | |
b84d4347 ML |
1956 | return true; |
1957 | } | |
1958 | case MEM_REF: | |
1959 | { | |
1960 | tree x1 = TREE_OPERAND (t1, 0); | |
1961 | tree x2 = TREE_OPERAND (t2, 0); | |
1962 | tree y1 = TREE_OPERAND (t1, 1); | |
1963 | tree y2 = TREE_OPERAND (t2, 1); | |
1964 | ||
060cfff4 | 1965 | if (!func_checker::compatible_types_p (TREE_TYPE (x1), TREE_TYPE (x2))) |
b84d4347 ML |
1966 | return return_false (); |
1967 | ||
1968 | /* Type of the offset on MEM_REF does not matter. */ | |
46305737 JH |
1969 | return return_with_debug (sem_variable::equals (x1, x2) |
1970 | && wi::to_offset (y1) | |
1971 | == wi::to_offset (y2)); | |
b84d4347 | 1972 | } |
b84d4347 | 1973 | case ADDR_EXPR: |
46305737 | 1974 | case FDESC_EXPR: |
b84d4347 ML |
1975 | { |
1976 | tree op1 = TREE_OPERAND (t1, 0); | |
1977 | tree op2 = TREE_OPERAND (t2, 0); | |
1978 | return sem_variable::equals (op1, op2); | |
1979 | } | |
46305737 | 1980 | /* References to other vars/decls are compared using ipa-ref. */ |
b84d4347 ML |
1981 | case FUNCTION_DECL: |
1982 | case VAR_DECL: | |
46305737 JH |
1983 | if (decl_in_symtab_p (t1) && decl_in_symtab_p (t2)) |
1984 | return true; | |
1985 | return return_false_with_msg ("Declaration mismatch"); | |
1986 | case CONST_DECL: | |
1987 | /* TODO: We can check CONST_DECL by its DECL_INITIAL, but for that we | |
1988 | need to process its VAR/FUNCTION references without relying on ipa-ref | |
1989 | compare. */ | |
b84d4347 ML |
1990 | case FIELD_DECL: |
1991 | case LABEL_DECL: | |
46305737 | 1992 | return return_false_with_msg ("Declaration mismatch"); |
b84d4347 | 1993 | case INTEGER_CST: |
46305737 JH |
1994 | /* Integer constants are the same only if the same width of type. */ |
1995 | if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2))) | |
1996 | return return_false_with_msg ("INTEGER_CST precision mismatch"); | |
1997 | if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2))) | |
1998 | return return_false_with_msg ("INTEGER_CST mode mismatch"); | |
1999 | return return_with_debug (tree_int_cst_equal (t1, t2)); | |
b84d4347 | 2000 | case STRING_CST: |
46305737 JH |
2001 | if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2))) |
2002 | return return_false_with_msg ("STRING_CST mode mismatch"); | |
2003 | if (TREE_STRING_LENGTH (t1) != TREE_STRING_LENGTH (t2)) | |
2004 | return return_false_with_msg ("STRING_CST length mismatch"); | |
2005 | if (memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2), | |
2006 | TREE_STRING_LENGTH (t1))) | |
2007 | return return_false_with_msg ("STRING_CST mismatch"); | |
2008 | return true; | |
2009 | case FIXED_CST: | |
2010 | /* Fixed constants are the same only if the same width of type. */ | |
2011 | if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2))) | |
2012 | return return_false_with_msg ("FIXED_CST precision mismatch"); | |
2013 | ||
2014 | return return_with_debug (FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1), | |
2015 | TREE_FIXED_CST (t2))); | |
b84d4347 | 2016 | case COMPLEX_CST: |
46305737 JH |
2017 | return (sem_variable::equals (TREE_REALPART (t1), TREE_REALPART (t2)) |
2018 | && sem_variable::equals (TREE_IMAGPART (t1), TREE_IMAGPART (t2))); | |
2019 | case REAL_CST: | |
2020 | /* Real constants are the same only if the same width of type. */ | |
2021 | if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2))) | |
2022 | return return_false_with_msg ("REAL_CST precision mismatch"); | |
1a25c6b1 RS |
2023 | return return_with_debug (real_identical (&TREE_REAL_CST (t1), |
2024 | &TREE_REAL_CST (t2))); | |
46305737 JH |
2025 | case VECTOR_CST: |
2026 | { | |
2027 | unsigned i; | |
2028 | ||
2029 | if (VECTOR_CST_NELTS (t1) != VECTOR_CST_NELTS (t2)) | |
2030 | return return_false_with_msg ("VECTOR_CST nelts mismatch"); | |
2031 | ||
2032 | for (i = 0; i < VECTOR_CST_NELTS (t1); ++i) | |
2033 | if (!sem_variable::equals (VECTOR_CST_ELT (t1, i), | |
2034 | VECTOR_CST_ELT (t2, i))) | |
2035 | return 0; | |
2036 | ||
2037 | return 1; | |
2038 | } | |
b84d4347 | 2039 | case ARRAY_REF: |
46305737 JH |
2040 | case ARRAY_RANGE_REF: |
2041 | { | |
2042 | tree x1 = TREE_OPERAND (t1, 0); | |
2043 | tree x2 = TREE_OPERAND (t2, 0); | |
2044 | tree y1 = TREE_OPERAND (t1, 1); | |
2045 | tree y2 = TREE_OPERAND (t2, 1); | |
2046 | ||
3c031cbe | 2047 | if (!sem_variable::equals (x1, x2) || !sem_variable::equals (y1, y2)) |
46305737 JH |
2048 | return false; |
2049 | if (!sem_variable::equals (array_ref_low_bound (t1), | |
2050 | array_ref_low_bound (t2))) | |
2051 | return false; | |
2052 | if (!sem_variable::equals (array_ref_element_size (t1), | |
2053 | array_ref_element_size (t2))) | |
2054 | return false; | |
2055 | return true; | |
2056 | } | |
2057 | ||
2058 | case COMPONENT_REF: | |
b84d4347 | 2059 | case POINTER_PLUS_EXPR: |
46305737 JH |
2060 | case PLUS_EXPR: |
2061 | case MINUS_EXPR: | |
2062 | case RANGE_EXPR: | |
b84d4347 ML |
2063 | { |
2064 | tree x1 = TREE_OPERAND (t1, 0); | |
2065 | tree x2 = TREE_OPERAND (t2, 0); | |
2066 | tree y1 = TREE_OPERAND (t1, 1); | |
2067 | tree y2 = TREE_OPERAND (t2, 1); | |
2068 | ||
2069 | return sem_variable::equals (x1, x2) && sem_variable::equals (y1, y2); | |
2070 | } | |
46305737 JH |
2071 | |
2072 | CASE_CONVERT: | |
2073 | case VIEW_CONVERT_EXPR: | |
060cfff4 | 2074 | if (!func_checker::compatible_types_p (TREE_TYPE (t1), TREE_TYPE (t2))) |
46305737 JH |
2075 | return return_false (); |
2076 | return sem_variable::equals (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0)); | |
b84d4347 ML |
2077 | case ERROR_MARK: |
2078 | return return_false_with_msg ("ERROR_MARK"); | |
2079 | default: | |
2080 | return return_false_with_msg ("Unknown TREE code reached"); | |
2081 | } | |
2082 | } | |
2083 | ||
2084 | /* Parser function that visits a varpool NODE. */ | |
2085 | ||
2086 | sem_variable * | |
2087 | sem_variable::parse (varpool_node *node, bitmap_obstack *stack) | |
2088 | { | |
6fb12821 ML |
2089 | if (TREE_THIS_VOLATILE (node->decl) || DECL_HARD_REGISTER (node->decl) |
2090 | || node->alias) | |
b84d4347 ML |
2091 | return NULL; |
2092 | ||
fedf2718 | 2093 | sem_variable *v = new sem_variable (node, stack); |
b84d4347 ML |
2094 | |
2095 | v->init (); | |
2096 | ||
2097 | return v; | |
2098 | } | |
2099 | ||
2100 | /* References independent hash function. */ | |
2101 | ||
2102 | hashval_t | |
2103 | sem_variable::get_hash (void) | |
2104 | { | |
fedf2718 | 2105 | if (m_hash_set) |
808b6bb7 | 2106 | return m_hash; |
3ab93359 | 2107 | |
a8d93817 JH |
2108 | /* All WPA streamed in symbols should have their hashes computed at compile |
2109 | time. At this point, the constructor may not be in memory at all. | |
2110 | DECL_INITIAL (decl) would be error_mark_node in that case. */ | |
2111 | gcc_assert (!node->lto_file_data); | |
2112 | tree ctor = DECL_INITIAL (decl); | |
b84d4347 ML |
2113 | inchash::hash hstate; |
2114 | ||
2115 | hstate.add_int (456346417); | |
a8d93817 JH |
2116 | if (DECL_SIZE (decl) && tree_fits_shwi_p (DECL_SIZE (decl))) |
2117 | hstate.add_wide_int (tree_to_shwi (DECL_SIZE (decl))); | |
2118 | add_expr (ctor, hstate); | |
808b6bb7 | 2119 | set_hash (hstate.end ()); |
b84d4347 | 2120 | |
808b6bb7 | 2121 | return m_hash; |
b84d4347 ML |
2122 | } |
2123 | ||
5560d026 CLT |
2124 | /* Set all points-to UIDs of aliases pointing to node N as UID. */ |
2125 | ||
2126 | static void | |
2127 | set_alias_uids (symtab_node *n, int uid) | |
2128 | { | |
2129 | ipa_ref *ref; | |
2130 | FOR_EACH_ALIAS (n, ref) | |
2131 | { | |
2132 | if (dump_file) | |
2133 | fprintf (dump_file, " Setting points-to UID of [%s] as %d\n", | |
2134 | xstrdup_for_dump (ref->referring->asm_name ()), uid); | |
2135 | ||
2136 | SET_DECL_PT_UID (ref->referring->decl, uid); | |
2137 | set_alias_uids (ref->referring, uid); | |
2138 | } | |
2139 | } | |
2140 | ||
b84d4347 ML |
2141 | /* Merges instance with an ALIAS_ITEM, where alias, thunk or redirection can |
2142 | be applied. */ | |
2143 | ||
2144 | bool | |
2145 | sem_variable::merge (sem_item *alias_item) | |
2146 | { | |
2147 | gcc_assert (alias_item->type == VAR); | |
2148 | ||
f657d665 ML |
2149 | if (!sem_item::target_supports_symbol_aliases_p ()) |
2150 | { | |
2151 | if (dump_file) | |
0a7246ee JH |
2152 | fprintf (dump_file, "Not unifying; " |
2153 | "Symbol aliases are not supported by target\n\n"); | |
f657d665 ML |
2154 | return false; |
2155 | } | |
2156 | ||
257291fc JH |
2157 | if (DECL_EXTERNAL (alias_item->decl)) |
2158 | { | |
2159 | if (dump_file) | |
2160 | fprintf (dump_file, "Not unifying; alias is external.\n\n"); | |
2161 | return false; | |
2162 | } | |
2163 | ||
b84d4347 ML |
2164 | sem_variable *alias_var = static_cast<sem_variable *> (alias_item); |
2165 | ||
2166 | varpool_node *original = get_node (); | |
2167 | varpool_node *alias = alias_var->get_node (); | |
2168 | bool original_discardable = false; | |
2169 | ||
0a7246ee JH |
2170 | bool alias_address_matters = alias->address_matters_p (); |
2171 | ||
b84d4347 | 2172 | /* See if original is in a section that can be discarded if the main |
0a7246ee JH |
2173 | symbol is not used. |
2174 | Also consider case where we have resolution info and we know that | |
2175 | original's definition is not going to be used. In this case we can not | |
2176 | create alias to original. */ | |
2177 | if (original->can_be_discarded_p () | |
2178 | || (node->resolution != LDPR_UNKNOWN | |
2179 | && !decl_binds_to_current_def_p (node->decl))) | |
b84d4347 ML |
2180 | original_discardable = true; |
2181 | ||
2182 | gcc_assert (!TREE_ASM_WRITTEN (alias->decl)); | |
2183 | ||
0a7246ee JH |
2184 | /* Constant pool machinery is not quite ready for aliases. |
2185 | TODO: varasm code contains logic for merging DECL_IN_CONSTANT_POOL. | |
2186 | For LTO merging does not happen that is an important missing feature. | |
2187 | We can enable merging with LTO if the DECL_IN_CONSTANT_POOL | |
2188 | flag is dropped and non-local symbol name is assigned. */ | |
2189 | if (DECL_IN_CONSTANT_POOL (alias->decl) | |
2190 | || DECL_IN_CONSTANT_POOL (original->decl)) | |
b84d4347 ML |
2191 | { |
2192 | if (dump_file) | |
0a7246ee JH |
2193 | fprintf (dump_file, |
2194 | "Not unifying; constant pool variables.\n\n"); | |
2195 | return false; | |
2196 | } | |
b84d4347 | 2197 | |
0a7246ee JH |
2198 | /* Do not attempt to mix functions from different user sections; |
2199 | we do not know what user intends with those. */ | |
2200 | if (((DECL_SECTION_NAME (original->decl) && !original->implicit_section) | |
2201 | || (DECL_SECTION_NAME (alias->decl) && !alias->implicit_section)) | |
2202 | && DECL_SECTION_NAME (original->decl) != DECL_SECTION_NAME (alias->decl)) | |
2203 | { | |
2204 | if (dump_file) | |
2205 | fprintf (dump_file, | |
2206 | "Not unifying; " | |
2207 | "original and alias are in different sections.\n\n"); | |
b84d4347 ML |
2208 | return false; |
2209 | } | |
0a7246ee JH |
2210 | |
2211 | /* We can not merge if address comparsion metters. */ | |
a13f439f | 2212 | if (alias_address_matters && flag_merge_constants < 2) |
b84d4347 | 2213 | { |
0a7246ee JH |
2214 | if (dump_file) |
2215 | fprintf (dump_file, | |
fcbc975b | 2216 | "Not unifying; address of original may be compared.\n\n"); |
0a7246ee JH |
2217 | return false; |
2218 | } | |
90a7a40b AM |
2219 | |
2220 | if (DECL_ALIGN (original->decl) < DECL_ALIGN (alias->decl)) | |
2221 | { | |
2222 | if (dump_file) | |
2223 | fprintf (dump_file, "Not unifying; " | |
2224 | "original and alias have incompatible alignments\n\n"); | |
2225 | ||
2226 | return false; | |
2227 | } | |
2228 | ||
c7a06bc1 JH |
2229 | if (DECL_COMDAT_GROUP (original->decl) != DECL_COMDAT_GROUP (alias->decl)) |
2230 | { | |
2231 | if (dump_file) | |
2232 | fprintf (dump_file, "Not unifying; alias cannot be created; " | |
2233 | "across comdat group boundary\n\n"); | |
2234 | ||
2235 | return false; | |
2236 | } | |
b84d4347 | 2237 | |
c7a06bc1 | 2238 | if (original_discardable) |
0a7246ee JH |
2239 | { |
2240 | if (dump_file) | |
2241 | fprintf (dump_file, "Not unifying; alias cannot be created; " | |
2242 | "target is discardable\n\n"); | |
b84d4347 | 2243 | |
0a7246ee JH |
2244 | return false; |
2245 | } | |
2246 | else | |
2247 | { | |
2248 | gcc_assert (!original->alias); | |
2249 | gcc_assert (!alias->alias); | |
b84d4347 ML |
2250 | |
2251 | alias->analyzed = false; | |
2252 | ||
2253 | DECL_INITIAL (alias->decl) = NULL; | |
412049de JH |
2254 | ((symtab_node *)alias)->call_for_symbol_and_aliases (clear_decl_rtl, |
2255 | NULL, true); | |
d5e254e1 | 2256 | alias->need_bounds_init = false; |
b84d4347 | 2257 | alias->remove_all_references (); |
0a7246ee JH |
2258 | if (TREE_ADDRESSABLE (alias->decl)) |
2259 | original->call_for_symbol_and_aliases (set_addressable, NULL, true); | |
b84d4347 ML |
2260 | |
2261 | varpool_node::create_alias (alias_var->decl, decl); | |
2262 | alias->resolve_alias (original); | |
2263 | ||
2264 | if (dump_file) | |
5560d026 | 2265 | fprintf (dump_file, "Unified; Variable alias has been created.\n"); |
b84d4347 | 2266 | |
5560d026 | 2267 | set_alias_uids (original, DECL_UID (original->decl)); |
b84d4347 ML |
2268 | return true; |
2269 | } | |
2270 | } | |
2271 | ||
b84d4347 ML |
2272 | /* Dump symbol to FILE. */ |
2273 | ||
2274 | void | |
2275 | sem_variable::dump_to_file (FILE *file) | |
2276 | { | |
2277 | gcc_assert (file); | |
2278 | ||
2279 | print_node (file, "", decl, 0); | |
2280 | fprintf (file, "\n\n"); | |
2281 | } | |
2282 | ||
b84d4347 ML |
2283 | unsigned int sem_item_optimizer::class_id = 0; |
2284 | ||
fedf2718 ML |
2285 | sem_item_optimizer::sem_item_optimizer () |
2286 | : worklist (0), m_classes (0), m_classes_count (0), m_cgraph_node_hooks (NULL), | |
2287 | m_varpool_node_hooks (NULL) | |
b84d4347 ML |
2288 | { |
2289 | m_items.create (0); | |
2290 | bitmap_obstack_initialize (&m_bmstack); | |
2291 | } | |
2292 | ||
2293 | sem_item_optimizer::~sem_item_optimizer () | |
2294 | { | |
2295 | for (unsigned int i = 0; i < m_items.length (); i++) | |
2296 | delete m_items[i]; | |
2297 | ||
3746a4b2 ML |
2298 | |
2299 | for (hash_table<congruence_class_hash>::iterator it = m_classes.begin (); | |
2300 | it != m_classes.end (); ++it) | |
b84d4347 | 2301 | { |
3746a4b2 ML |
2302 | for (unsigned int i = 0; i < (*it)->classes.length (); i++) |
2303 | delete (*it)->classes[i]; | |
b84d4347 | 2304 | |
3746a4b2 ML |
2305 | (*it)->classes.release (); |
2306 | free (*it); | |
b84d4347 ML |
2307 | } |
2308 | ||
2309 | m_items.release (); | |
2310 | ||
2311 | bitmap_obstack_release (&m_bmstack); | |
2312 | } | |
2313 | ||
2314 | /* Write IPA ICF summary for symbols. */ | |
2315 | ||
2316 | void | |
2317 | sem_item_optimizer::write_summary (void) | |
2318 | { | |
2319 | unsigned int count = 0; | |
2320 | ||
2321 | output_block *ob = create_output_block (LTO_section_ipa_icf); | |
2322 | lto_symtab_encoder_t encoder = ob->decl_state->symtab_node_encoder; | |
2323 | ob->symbol = NULL; | |
2324 | ||
2325 | /* Calculate number of symbols to be serialized. */ | |
2326 | for (lto_symtab_encoder_iterator lsei = lsei_start_in_partition (encoder); | |
2327 | !lsei_end_p (lsei); | |
2328 | lsei_next_in_partition (&lsei)) | |
2329 | { | |
2330 | symtab_node *node = lsei_node (lsei); | |
2331 | ||
2332 | if (m_symtab_node_map.get (node)) | |
2333 | count++; | |
2334 | } | |
2335 | ||
2336 | streamer_write_uhwi (ob, count); | |
2337 | ||
2338 | /* Process all of the symbols. */ | |
2339 | for (lto_symtab_encoder_iterator lsei = lsei_start_in_partition (encoder); | |
2340 | !lsei_end_p (lsei); | |
2341 | lsei_next_in_partition (&lsei)) | |
2342 | { | |
2343 | symtab_node *node = lsei_node (lsei); | |
2344 | ||
2345 | sem_item **item = m_symtab_node_map.get (node); | |
2346 | ||
2347 | if (item && *item) | |
2348 | { | |
2349 | int node_ref = lto_symtab_encoder_encode (encoder, node); | |
2350 | streamer_write_uhwi_stream (ob->main_stream, node_ref); | |
2351 | ||
2352 | streamer_write_uhwi (ob, (*item)->get_hash ()); | |
2353 | } | |
2354 | } | |
2355 | ||
2356 | streamer_write_char_stream (ob->main_stream, 0); | |
2357 | produce_asm (ob, NULL); | |
2358 | destroy_output_block (ob); | |
2359 | } | |
2360 | ||
2361 | /* Reads a section from LTO stream file FILE_DATA. Input block for DATA | |
2362 | contains LEN bytes. */ | |
2363 | ||
2364 | void | |
2365 | sem_item_optimizer::read_section (lto_file_decl_data *file_data, | |
2366 | const char *data, size_t len) | |
2367 | { | |
df8391b4 JJ |
2368 | const lto_function_header *header |
2369 | = (const lto_function_header *) data; | |
b84d4347 ML |
2370 | const int cfg_offset = sizeof (lto_function_header); |
2371 | const int main_offset = cfg_offset + header->cfg_size; | |
2372 | const int string_offset = main_offset + header->main_size; | |
2373 | data_in *data_in; | |
2374 | unsigned int i; | |
2375 | unsigned int count; | |
2376 | ||
2377 | lto_input_block ib_main ((const char *) data + main_offset, 0, | |
db847fa8 | 2378 | header->main_size, file_data->mode_table); |
b84d4347 | 2379 | |
df8391b4 JJ |
2380 | data_in |
2381 | = lto_data_in_create (file_data, (const char *) data + string_offset, | |
2382 | header->string_size, vNULL); | |
b84d4347 ML |
2383 | |
2384 | count = streamer_read_uhwi (&ib_main); | |
2385 | ||
2386 | for (i = 0; i < count; i++) | |
2387 | { | |
2388 | unsigned int index; | |
2389 | symtab_node *node; | |
2390 | lto_symtab_encoder_t encoder; | |
2391 | ||
2392 | index = streamer_read_uhwi (&ib_main); | |
2393 | encoder = file_data->symtab_node_encoder; | |
2394 | node = lto_symtab_encoder_deref (encoder, index); | |
2395 | ||
2396 | hashval_t hash = streamer_read_uhwi (&ib_main); | |
2397 | ||
2398 | gcc_assert (node->definition); | |
2399 | ||
2400 | if (dump_file) | |
1aec2ecc ML |
2401 | fprintf (dump_file, "Symbol added:%s (tree: %p, uid:%u)\n", |
2402 | node->asm_name (), (void *) node->decl, node->order); | |
b84d4347 ML |
2403 | |
2404 | if (is_a<cgraph_node *> (node)) | |
2405 | { | |
2406 | cgraph_node *cnode = dyn_cast <cgraph_node *> (node); | |
2407 | ||
fedf2718 ML |
2408 | sem_function *fn = new sem_function (cnode, &m_bmstack); |
2409 | fn->set_hash (hash); | |
2410 | m_items.safe_push (fn); | |
b84d4347 ML |
2411 | } |
2412 | else | |
2413 | { | |
2414 | varpool_node *vnode = dyn_cast <varpool_node *> (node); | |
2415 | ||
fedf2718 ML |
2416 | sem_variable *var = new sem_variable (vnode, &m_bmstack); |
2417 | var->set_hash (hash); | |
2418 | m_items.safe_push (var); | |
b84d4347 ML |
2419 | } |
2420 | } | |
2421 | ||
2422 | lto_free_section_data (file_data, LTO_section_ipa_icf, NULL, data, | |
2423 | len); | |
2424 | lto_data_in_delete (data_in); | |
2425 | } | |
2426 | ||
026c3cfd | 2427 | /* Read IPA ICF summary for symbols. */ |
b84d4347 ML |
2428 | |
2429 | void | |
2430 | sem_item_optimizer::read_summary (void) | |
2431 | { | |
2432 | lto_file_decl_data **file_data_vec = lto_get_file_decl_data (); | |
2433 | lto_file_decl_data *file_data; | |
2434 | unsigned int j = 0; | |
2435 | ||
2436 | while ((file_data = file_data_vec[j++])) | |
2437 | { | |
2438 | size_t len; | |
2439 | const char *data = lto_get_section_data (file_data, | |
2440 | LTO_section_ipa_icf, NULL, &len); | |
2441 | ||
2442 | if (data) | |
2443 | read_section (file_data, data, len); | |
2444 | } | |
2445 | } | |
2446 | ||
2447 | /* Register callgraph and varpool hooks. */ | |
2448 | ||
2449 | void | |
2450 | sem_item_optimizer::register_hooks (void) | |
2451 | { | |
e3e968e9 ML |
2452 | if (!m_cgraph_node_hooks) |
2453 | m_cgraph_node_hooks = symtab->add_cgraph_removal_hook | |
2454 | (&sem_item_optimizer::cgraph_removal_hook, this); | |
b84d4347 | 2455 | |
e3e968e9 ML |
2456 | if (!m_varpool_node_hooks) |
2457 | m_varpool_node_hooks = symtab->add_varpool_removal_hook | |
2458 | (&sem_item_optimizer::varpool_removal_hook, this); | |
b84d4347 ML |
2459 | } |
2460 | ||
2461 | /* Unregister callgraph and varpool hooks. */ | |
2462 | ||
2463 | void | |
2464 | sem_item_optimizer::unregister_hooks (void) | |
2465 | { | |
2466 | if (m_cgraph_node_hooks) | |
2467 | symtab->remove_cgraph_removal_hook (m_cgraph_node_hooks); | |
2468 | ||
2469 | if (m_varpool_node_hooks) | |
2470 | symtab->remove_varpool_removal_hook (m_varpool_node_hooks); | |
2471 | } | |
2472 | ||
2473 | /* Adds a CLS to hashtable associated by hash value. */ | |
2474 | ||
2475 | void | |
2476 | sem_item_optimizer::add_class (congruence_class *cls) | |
2477 | { | |
2478 | gcc_assert (cls->members.length ()); | |
2479 | ||
df8391b4 JJ |
2480 | congruence_class_group *group |
2481 | = get_group_by_hash (cls->members[0]->get_hash (), | |
2482 | cls->members[0]->type); | |
b84d4347 ML |
2483 | group->classes.safe_push (cls); |
2484 | } | |
2485 | ||
2486 | /* Gets a congruence class group based on given HASH value and TYPE. */ | |
2487 | ||
2488 | congruence_class_group * | |
2489 | sem_item_optimizer::get_group_by_hash (hashval_t hash, sem_item_type type) | |
2490 | { | |
2491 | congruence_class_group *item = XNEW (congruence_class_group); | |
2492 | item->hash = hash; | |
2493 | item->type = type; | |
2494 | ||
2495 | congruence_class_group **slot = m_classes.find_slot (item, INSERT); | |
2496 | ||
2497 | if (*slot) | |
2498 | free (item); | |
2499 | else | |
2500 | { | |
2501 | item->classes.create (1); | |
2502 | *slot = item; | |
2503 | } | |
2504 | ||
2505 | return *slot; | |
2506 | } | |
2507 | ||
2508 | /* Callgraph removal hook called for a NODE with a custom DATA. */ | |
2509 | ||
2510 | void | |
2511 | sem_item_optimizer::cgraph_removal_hook (cgraph_node *node, void *data) | |
2512 | { | |
2513 | sem_item_optimizer *optimizer = (sem_item_optimizer *) data; | |
2514 | optimizer->remove_symtab_node (node); | |
2515 | } | |
2516 | ||
2517 | /* Varpool removal hook called for a NODE with a custom DATA. */ | |
2518 | ||
2519 | void | |
2520 | sem_item_optimizer::varpool_removal_hook (varpool_node *node, void *data) | |
2521 | { | |
2522 | sem_item_optimizer *optimizer = (sem_item_optimizer *) data; | |
2523 | optimizer->remove_symtab_node (node); | |
2524 | } | |
2525 | ||
2526 | /* Remove symtab NODE triggered by symtab removal hooks. */ | |
2527 | ||
2528 | void | |
2529 | sem_item_optimizer::remove_symtab_node (symtab_node *node) | |
2530 | { | |
df8391b4 | 2531 | gcc_assert (!m_classes.elements ()); |
b84d4347 ML |
2532 | |
2533 | m_removed_items_set.add (node); | |
2534 | } | |
2535 | ||
2536 | void | |
2537 | sem_item_optimizer::remove_item (sem_item *item) | |
2538 | { | |
2539 | if (m_symtab_node_map.get (item->node)) | |
2540 | m_symtab_node_map.remove (item->node); | |
2541 | delete item; | |
2542 | } | |
2543 | ||
2544 | /* Removes all callgraph and varpool nodes that are marked by symtab | |
2545 | as deleted. */ | |
2546 | ||
2547 | void | |
2548 | sem_item_optimizer::filter_removed_items (void) | |
2549 | { | |
2550 | auto_vec <sem_item *> filtered; | |
2551 | ||
2552 | for (unsigned int i = 0; i < m_items.length(); i++) | |
2553 | { | |
2554 | sem_item *item = m_items[i]; | |
2555 | ||
90190bb3 ML |
2556 | if (m_removed_items_set.contains (item->node)) |
2557 | { | |
b84d4347 ML |
2558 | remove_item (item); |
2559 | continue; | |
90190bb3 | 2560 | } |
b84d4347 ML |
2561 | |
2562 | if (item->type == FUNC) | |
90190bb3 | 2563 | { |
b84d4347 ML |
2564 | cgraph_node *cnode = static_cast <sem_function *>(item)->get_node (); |
2565 | ||
060cfff4 | 2566 | if (in_lto_p && (cnode->alias || cnode->body_removed)) |
90190bb3 ML |
2567 | remove_item (item); |
2568 | else | |
2569 | filtered.safe_push (item); | |
2570 | } | |
2571 | else /* VAR. */ | |
2572 | { | |
2573 | if (!flag_ipa_icf_variables) | |
2574 | remove_item (item); | |
2575 | else | |
c4c0f336 ML |
2576 | { |
2577 | /* Filter out non-readonly variables. */ | |
2578 | tree decl = item->decl; | |
2579 | if (TREE_READONLY (decl)) | |
2580 | filtered.safe_push (item); | |
2581 | else | |
2582 | remove_item (item); | |
2583 | } | |
90190bb3 | 2584 | } |
b84d4347 ML |
2585 | } |
2586 | ||
2587 | /* Clean-up of released semantic items. */ | |
2588 | ||
2589 | m_items.release (); | |
2590 | for (unsigned int i = 0; i < filtered.length(); i++) | |
2591 | m_items.safe_push (filtered[i]); | |
2592 | } | |
2593 | ||
bd31fe14 ML |
2594 | /* Optimizer entry point which returns true in case it processes |
2595 | a merge operation. True is returned if there's a merge operation | |
2596 | processed. */ | |
b84d4347 | 2597 | |
bd31fe14 | 2598 | bool |
b84d4347 ML |
2599 | sem_item_optimizer::execute (void) |
2600 | { | |
2601 | filter_removed_items (); | |
8b048701 JJ |
2602 | unregister_hooks (); |
2603 | ||
3ab93359 ML |
2604 | build_graph (); |
2605 | update_hash_by_addr_refs (); | |
b84d4347 ML |
2606 | build_hash_based_classes (); |
2607 | ||
2608 | if (dump_file) | |
2609 | fprintf (dump_file, "Dump after hash based groups\n"); | |
2610 | dump_cong_classes (); | |
2611 | ||
2612 | for (unsigned int i = 0; i < m_items.length(); i++) | |
2613 | m_items[i]->init_wpa (); | |
2614 | ||
b84d4347 ML |
2615 | subdivide_classes_by_equality (true); |
2616 | ||
2617 | if (dump_file) | |
2618 | fprintf (dump_file, "Dump after WPA based types groups\n"); | |
2619 | ||
2620 | dump_cong_classes (); | |
2621 | ||
2622 | process_cong_reduction (); | |
b2b29377 | 2623 | checking_verify_classes (); |
b84d4347 ML |
2624 | |
2625 | if (dump_file) | |
2626 | fprintf (dump_file, "Dump after callgraph-based congruence reduction\n"); | |
2627 | ||
2628 | dump_cong_classes (); | |
2629 | ||
2630 | parse_nonsingleton_classes (); | |
2631 | subdivide_classes_by_equality (); | |
2632 | ||
2633 | if (dump_file) | |
2634 | fprintf (dump_file, "Dump after full equality comparison of groups\n"); | |
2635 | ||
2636 | dump_cong_classes (); | |
2637 | ||
2638 | unsigned int prev_class_count = m_classes_count; | |
2639 | ||
2640 | process_cong_reduction (); | |
2641 | dump_cong_classes (); | |
b2b29377 | 2642 | checking_verify_classes (); |
bd31fe14 | 2643 | bool merged_p = merge_classes (prev_class_count); |
b84d4347 ML |
2644 | |
2645 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
6c52831d | 2646 | symtab->dump (dump_file); |
bd31fe14 ML |
2647 | |
2648 | return merged_p; | |
b84d4347 ML |
2649 | } |
2650 | ||
2651 | /* Function responsible for visiting all potential functions and | |
2652 | read-only variables that can be merged. */ | |
2653 | ||
2654 | void | |
2655 | sem_item_optimizer::parse_funcs_and_vars (void) | |
2656 | { | |
2657 | cgraph_node *cnode; | |
2658 | ||
2659 | if (flag_ipa_icf_functions) | |
2660 | FOR_EACH_DEFINED_FUNCTION (cnode) | |
2661 | { | |
2662 | sem_function *f = sem_function::parse (cnode, &m_bmstack); | |
2663 | if (f) | |
2664 | { | |
2665 | m_items.safe_push (f); | |
2666 | m_symtab_node_map.put (cnode, f); | |
2667 | ||
2668 | if (dump_file) | |
1aec2ecc | 2669 | fprintf (dump_file, "Parsed function:%s\n", f->node->asm_name ()); |
b84d4347 ML |
2670 | |
2671 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
2672 | f->dump_to_file (dump_file); | |
2673 | } | |
2674 | else if (dump_file) | |
2675 | fprintf (dump_file, "Not parsed function:%s\n", cnode->asm_name ()); | |
2676 | } | |
2677 | ||
2678 | varpool_node *vnode; | |
2679 | ||
2680 | if (flag_ipa_icf_variables) | |
2681 | FOR_EACH_DEFINED_VARIABLE (vnode) | |
2682 | { | |
2683 | sem_variable *v = sem_variable::parse (vnode, &m_bmstack); | |
2684 | ||
2685 | if (v) | |
2686 | { | |
2687 | m_items.safe_push (v); | |
2688 | m_symtab_node_map.put (vnode, v); | |
2689 | } | |
2690 | } | |
2691 | } | |
2692 | ||
2693 | /* Makes pairing between a congruence class CLS and semantic ITEM. */ | |
2694 | ||
2695 | void | |
2696 | sem_item_optimizer::add_item_to_class (congruence_class *cls, sem_item *item) | |
2697 | { | |
2698 | item->index_in_class = cls->members.length (); | |
2699 | cls->members.safe_push (item); | |
2700 | item->cls = cls; | |
2701 | } | |
2702 | ||
3ab93359 ML |
2703 | /* For each semantic item, append hash values of references. */ |
2704 | ||
2705 | void | |
2706 | sem_item_optimizer::update_hash_by_addr_refs () | |
2707 | { | |
69f6b1f4 JH |
2708 | /* First, append to hash sensitive references and class type if it need to |
2709 | be matched for ODR. */ | |
3ab93359 | 2710 | for (unsigned i = 0; i < m_items.length (); i++) |
69f6b1f4 JH |
2711 | { |
2712 | m_items[i]->update_hash_by_addr_refs (m_symtab_node_map); | |
2713 | if (m_items[i]->type == FUNC) | |
2714 | { | |
2715 | if (TREE_CODE (TREE_TYPE (m_items[i]->decl)) == METHOD_TYPE | |
2716 | && contains_polymorphic_type_p | |
70e7f2a2 | 2717 | (TYPE_METHOD_BASETYPE (TREE_TYPE (m_items[i]->decl))) |
69f6b1f4 | 2718 | && (DECL_CXX_CONSTRUCTOR_P (m_items[i]->decl) |
b3587b99 | 2719 | || (static_cast<sem_function *> (m_items[i])->param_used_p (0) |
69f6b1f4 JH |
2720 | && static_cast<sem_function *> (m_items[i]) |
2721 | ->compare_polymorphic_p ()))) | |
2722 | { | |
2723 | tree class_type | |
70e7f2a2 | 2724 | = TYPE_METHOD_BASETYPE (TREE_TYPE (m_items[i]->decl)); |
808b6bb7 | 2725 | inchash::hash hstate (m_items[i]->get_hash ()); |
69f6b1f4 JH |
2726 | |
2727 | if (TYPE_NAME (class_type) | |
2728 | && DECL_ASSEMBLER_NAME_SET_P (TYPE_NAME (class_type))) | |
2729 | hstate.add_wide_int | |
2730 | (IDENTIFIER_HASH_VALUE | |
2731 | (DECL_ASSEMBLER_NAME (TYPE_NAME (class_type)))); | |
2732 | ||
808b6bb7 | 2733 | m_items[i]->set_hash (hstate.end ()); |
69f6b1f4 JH |
2734 | } |
2735 | } | |
2736 | } | |
3ab93359 ML |
2737 | |
2738 | /* Once all symbols have enhanced hash value, we can append | |
2739 | hash values of symbols that are seen by IPA ICF and are | |
2740 | references by a semantic item. Newly computed values | |
2741 | are saved to global_hash member variable. */ | |
2742 | for (unsigned i = 0; i < m_items.length (); i++) | |
2743 | m_items[i]->update_hash_by_local_refs (m_symtab_node_map); | |
2744 | ||
2745 | /* Global hash value replace current hash values. */ | |
2746 | for (unsigned i = 0; i < m_items.length (); i++) | |
808b6bb7 | 2747 | m_items[i]->set_hash (m_items[i]->global_hash); |
3ab93359 ML |
2748 | } |
2749 | ||
b84d4347 ML |
2750 | /* Congruence classes are built by hash value. */ |
2751 | ||
2752 | void | |
2753 | sem_item_optimizer::build_hash_based_classes (void) | |
2754 | { | |
2755 | for (unsigned i = 0; i < m_items.length (); i++) | |
2756 | { | |
2757 | sem_item *item = m_items[i]; | |
2758 | ||
df8391b4 JJ |
2759 | congruence_class_group *group |
2760 | = get_group_by_hash (item->get_hash (), item->type); | |
b84d4347 ML |
2761 | |
2762 | if (!group->classes.length ()) | |
2763 | { | |
2764 | m_classes_count++; | |
2765 | group->classes.safe_push (new congruence_class (class_id++)); | |
2766 | } | |
2767 | ||
2768 | add_item_to_class (group->classes[0], item); | |
2769 | } | |
2770 | } | |
2771 | ||
2772 | /* Build references according to call graph. */ | |
2773 | ||
2774 | void | |
2775 | sem_item_optimizer::build_graph (void) | |
2776 | { | |
2777 | for (unsigned i = 0; i < m_items.length (); i++) | |
2778 | { | |
2779 | sem_item *item = m_items[i]; | |
2780 | m_symtab_node_map.put (item->node, item); | |
808b6bb7 ML |
2781 | |
2782 | /* Initialize hash values if we are not in LTO mode. */ | |
2783 | if (!in_lto_p) | |
2784 | item->get_hash (); | |
b84d4347 ML |
2785 | } |
2786 | ||
2787 | for (unsigned i = 0; i < m_items.length (); i++) | |
2788 | { | |
2789 | sem_item *item = m_items[i]; | |
2790 | ||
2791 | if (item->type == FUNC) | |
2792 | { | |
2793 | cgraph_node *cnode = dyn_cast <cgraph_node *> (item->node); | |
2794 | ||
2795 | cgraph_edge *e = cnode->callees; | |
2796 | while (e) | |
2797 | { | |
b6cddc7f ML |
2798 | sem_item **slot = m_symtab_node_map.get |
2799 | (e->callee->ultimate_alias_target ()); | |
b84d4347 ML |
2800 | if (slot) |
2801 | item->add_reference (*slot); | |
2802 | ||
2803 | e = e->next_callee; | |
2804 | } | |
2805 | } | |
2806 | ||
2807 | ipa_ref *ref = NULL; | |
2808 | for (unsigned i = 0; item->node->iterate_reference (i, ref); i++) | |
2809 | { | |
b6cddc7f ML |
2810 | sem_item **slot = m_symtab_node_map.get |
2811 | (ref->referred->ultimate_alias_target ()); | |
b84d4347 ML |
2812 | if (slot) |
2813 | item->add_reference (*slot); | |
2814 | } | |
2815 | } | |
2816 | } | |
2817 | ||
2818 | /* Semantic items in classes having more than one element and initialized. | |
2819 | In case of WPA, we load function body. */ | |
2820 | ||
2821 | void | |
2822 | sem_item_optimizer::parse_nonsingleton_classes (void) | |
2823 | { | |
2824 | unsigned int init_called_count = 0; | |
2825 | ||
2826 | for (unsigned i = 0; i < m_items.length (); i++) | |
2827 | if (m_items[i]->cls->members.length () > 1) | |
2828 | { | |
2829 | m_items[i]->init (); | |
2830 | init_called_count++; | |
2831 | } | |
2832 | ||
2833 | if (dump_file) | |
df8391b4 JJ |
2834 | fprintf (dump_file, "Init called for %u items (%.2f%%).\n", |
2835 | init_called_count, | |
2836 | m_items.length () ? 100.0f * init_called_count / m_items.length () | |
2837 | : 0.0f); | |
b84d4347 ML |
2838 | } |
2839 | ||
2840 | /* Equality function for semantic items is used to subdivide existing | |
2841 | classes. If IN_WPA, fast equality function is invoked. */ | |
2842 | ||
2843 | void | |
2844 | sem_item_optimizer::subdivide_classes_by_equality (bool in_wpa) | |
2845 | { | |
3746a4b2 ML |
2846 | for (hash_table <congruence_class_hash>::iterator it = m_classes.begin (); |
2847 | it != m_classes.end (); ++it) | |
b84d4347 | 2848 | { |
3746a4b2 | 2849 | unsigned int class_count = (*it)->classes.length (); |
b84d4347 ML |
2850 | |
2851 | for (unsigned i = 0; i < class_count; i++) | |
2852 | { | |
3746a4b2 | 2853 | congruence_class *c = (*it)->classes[i]; |
b84d4347 ML |
2854 | |
2855 | if (c->members.length() > 1) | |
2856 | { | |
2857 | auto_vec <sem_item *> new_vector; | |
2858 | ||
2859 | sem_item *first = c->members[0]; | |
2860 | new_vector.safe_push (first); | |
2861 | ||
3746a4b2 | 2862 | unsigned class_split_first = (*it)->classes.length (); |
b84d4347 ML |
2863 | |
2864 | for (unsigned j = 1; j < c->members.length (); j++) | |
2865 | { | |
2866 | sem_item *item = c->members[j]; | |
2867 | ||
df8391b4 JJ |
2868 | bool equals |
2869 | = in_wpa ? first->equals_wpa (item, m_symtab_node_map) | |
2870 | : first->equals (item, m_symtab_node_map); | |
b84d4347 ML |
2871 | |
2872 | if (equals) | |
2873 | new_vector.safe_push (item); | |
2874 | else | |
2875 | { | |
2876 | bool integrated = false; | |
2877 | ||
df8391b4 | 2878 | for (unsigned k = class_split_first; |
3746a4b2 | 2879 | k < (*it)->classes.length (); k++) |
b84d4347 | 2880 | { |
3746a4b2 | 2881 | sem_item *x = (*it)->classes[k]->members[0]; |
df8391b4 JJ |
2882 | bool equals |
2883 | = in_wpa ? x->equals_wpa (item, m_symtab_node_map) | |
2884 | : x->equals (item, m_symtab_node_map); | |
b84d4347 ML |
2885 | |
2886 | if (equals) | |
2887 | { | |
2888 | integrated = true; | |
3746a4b2 | 2889 | add_item_to_class ((*it)->classes[k], item); |
b84d4347 ML |
2890 | |
2891 | break; | |
2892 | } | |
2893 | } | |
2894 | ||
2895 | if (!integrated) | |
2896 | { | |
df8391b4 JJ |
2897 | congruence_class *c |
2898 | = new congruence_class (class_id++); | |
b84d4347 ML |
2899 | m_classes_count++; |
2900 | add_item_to_class (c, item); | |
2901 | ||
3746a4b2 | 2902 | (*it)->classes.safe_push (c); |
b84d4347 ML |
2903 | } |
2904 | } | |
2905 | } | |
2906 | ||
df8391b4 JJ |
2907 | // We replace newly created new_vector for the class we've just |
2908 | // splitted. | |
b84d4347 ML |
2909 | c->members.release (); |
2910 | c->members.create (new_vector.length ()); | |
2911 | ||
2912 | for (unsigned int j = 0; j < new_vector.length (); j++) | |
2913 | add_item_to_class (c, new_vector[j]); | |
2914 | } | |
2915 | } | |
2916 | } | |
2917 | ||
b2b29377 | 2918 | checking_verify_classes (); |
b84d4347 ML |
2919 | } |
2920 | ||
5ebd0e61 ML |
2921 | /* Subdivide classes by address references that members of the class |
2922 | reference. Example can be a pair of functions that have an address | |
2923 | taken from a function. If these addresses are different the class | |
2924 | is split. */ | |
2925 | ||
2926 | unsigned | |
2927 | sem_item_optimizer::subdivide_classes_by_sensitive_refs () | |
2928 | { | |
fb5c464a | 2929 | typedef hash_map <symbol_compare_hash, vec <sem_item *> > subdivide_hash_map; |
bbd08a5d | 2930 | |
5ebd0e61 ML |
2931 | unsigned newly_created_classes = 0; |
2932 | ||
3746a4b2 ML |
2933 | for (hash_table <congruence_class_hash>::iterator it = m_classes.begin (); |
2934 | it != m_classes.end (); ++it) | |
5ebd0e61 | 2935 | { |
3746a4b2 | 2936 | unsigned int class_count = (*it)->classes.length (); |
5ebd0e61 ML |
2937 | auto_vec<congruence_class *> new_classes; |
2938 | ||
2939 | for (unsigned i = 0; i < class_count; i++) | |
2940 | { | |
3746a4b2 | 2941 | congruence_class *c = (*it)->classes[i]; |
5ebd0e61 ML |
2942 | |
2943 | if (c->members.length() > 1) | |
2944 | { | |
bbd08a5d | 2945 | subdivide_hash_map split_map; |
5ebd0e61 ML |
2946 | |
2947 | for (unsigned j = 0; j < c->members.length (); j++) | |
2948 | { | |
2949 | sem_item *source_node = c->members[j]; | |
2950 | ||
df8391b4 JJ |
2951 | symbol_compare_collection *collection |
2952 | = new symbol_compare_collection (source_node->node); | |
5ebd0e61 | 2953 | |
bbd08a5d | 2954 | bool existed; |
df8391b4 JJ |
2955 | vec <sem_item *> *slot |
2956 | = &split_map.get_or_insert (collection, &existed); | |
5ebd0e61 ML |
2957 | gcc_checking_assert (slot); |
2958 | ||
2959 | slot->safe_push (source_node); | |
bbd08a5d ML |
2960 | |
2961 | if (existed) | |
2962 | delete collection; | |
5ebd0e61 ML |
2963 | } |
2964 | ||
df8391b4 JJ |
2965 | /* If the map contains more than one key, we have to split |
2966 | the map appropriately. */ | |
5ebd0e61 ML |
2967 | if (split_map.elements () != 1) |
2968 | { | |
2969 | bool first_class = true; | |
2970 | ||
bbd08a5d ML |
2971 | for (subdivide_hash_map::iterator it2 = split_map.begin (); |
2972 | it2 != split_map.end (); ++it2) | |
5ebd0e61 ML |
2973 | { |
2974 | congruence_class *new_cls; | |
2975 | new_cls = new congruence_class (class_id++); | |
2976 | ||
2977 | for (unsigned k = 0; k < (*it2).second.length (); k++) | |
2978 | add_item_to_class (new_cls, (*it2).second[k]); | |
2979 | ||
2980 | worklist_push (new_cls); | |
2981 | newly_created_classes++; | |
2982 | ||
2983 | if (first_class) | |
2984 | { | |
3746a4b2 | 2985 | (*it)->classes[i] = new_cls; |
5ebd0e61 ML |
2986 | first_class = false; |
2987 | } | |
2988 | else | |
2989 | { | |
2990 | new_classes.safe_push (new_cls); | |
2991 | m_classes_count++; | |
2992 | } | |
2993 | } | |
2994 | } | |
bbd08a5d ML |
2995 | |
2996 | /* Release memory. */ | |
2997 | for (subdivide_hash_map::iterator it2 = split_map.begin (); | |
2998 | it2 != split_map.end (); ++it2) | |
2999 | { | |
3000 | delete (*it2).first; | |
3001 | (*it2).second.release (); | |
3002 | } | |
5ebd0e61 ML |
3003 | } |
3004 | } | |
3005 | ||
3006 | for (unsigned i = 0; i < new_classes.length (); i++) | |
3746a4b2 | 3007 | (*it)->classes.safe_push (new_classes[i]); |
5ebd0e61 ML |
3008 | } |
3009 | ||
3010 | return newly_created_classes; | |
3011 | } | |
3012 | ||
b2b29377 MM |
3013 | /* Verify congruence classes, if checking is enabled. */ |
3014 | ||
3015 | void | |
3016 | sem_item_optimizer::checking_verify_classes (void) | |
3017 | { | |
3018 | if (flag_checking) | |
3019 | verify_classes (); | |
3020 | } | |
3021 | ||
3022 | /* Verify congruence classes. */ | |
b84d4347 ML |
3023 | |
3024 | void | |
3025 | sem_item_optimizer::verify_classes (void) | |
3026 | { | |
3746a4b2 ML |
3027 | for (hash_table<congruence_class_hash>::iterator it = m_classes.begin (); |
3028 | it != m_classes.end (); ++it) | |
b84d4347 | 3029 | { |
3746a4b2 | 3030 | for (unsigned int i = 0; i < (*it)->classes.length (); i++) |
b84d4347 | 3031 | { |
3746a4b2 | 3032 | congruence_class *cls = (*it)->classes[i]; |
b84d4347 | 3033 | |
b2b29377 MM |
3034 | gcc_assert (cls); |
3035 | gcc_assert (cls->members.length () > 0); | |
b84d4347 ML |
3036 | |
3037 | for (unsigned int j = 0; j < cls->members.length (); j++) | |
3038 | { | |
3039 | sem_item *item = cls->members[j]; | |
3040 | ||
b2b29377 MM |
3041 | gcc_assert (item); |
3042 | gcc_assert (item->cls == cls); | |
b84d4347 ML |
3043 | |
3044 | for (unsigned k = 0; k < item->usages.length (); k++) | |
3045 | { | |
3046 | sem_usage_pair *usage = item->usages[k]; | |
df8391b4 JJ |
3047 | gcc_assert (usage->item->index_in_class |
3048 | < usage->item->cls->members.length ()); | |
b84d4347 ML |
3049 | } |
3050 | } | |
3051 | } | |
3052 | } | |
b84d4347 ML |
3053 | } |
3054 | ||
3055 | /* Disposes split map traverse function. CLS_PTR is pointer to congruence | |
3056 | class, BSLOT is bitmap slot we want to release. DATA is mandatory, | |
3057 | but unused argument. */ | |
3058 | ||
3059 | bool | |
3060 | sem_item_optimizer::release_split_map (congruence_class * const &, | |
3061 | bitmap const &b, traverse_split_pair *) | |
3062 | { | |
3063 | bitmap bmp = b; | |
3064 | ||
3065 | BITMAP_FREE (bmp); | |
3066 | ||
3067 | return true; | |
3068 | } | |
3069 | ||
3070 | /* Process split operation for a class given as pointer CLS_PTR, | |
3071 | where bitmap B splits congruence class members. DATA is used | |
3072 | as argument of split pair. */ | |
3073 | ||
3074 | bool | |
3075 | sem_item_optimizer::traverse_congruence_split (congruence_class * const &cls, | |
df8391b4 JJ |
3076 | bitmap const &b, |
3077 | traverse_split_pair *pair) | |
b84d4347 ML |
3078 | { |
3079 | sem_item_optimizer *optimizer = pair->optimizer; | |
3080 | const congruence_class *splitter_cls = pair->cls; | |
3081 | ||
3082 | /* If counted bits are greater than zero and less than the number of members | |
3083 | a group will be splitted. */ | |
3084 | unsigned popcount = bitmap_count_bits (b); | |
3085 | ||
3086 | if (popcount > 0 && popcount < cls->members.length ()) | |
3087 | { | |
c9ab724f ML |
3088 | auto_vec <congruence_class *, 2> newclasses; |
3089 | newclasses.quick_push (new congruence_class (class_id++)); | |
3090 | newclasses.quick_push (new congruence_class (class_id++)); | |
b84d4347 ML |
3091 | |
3092 | for (unsigned int i = 0; i < cls->members.length (); i++) | |
3093 | { | |
3094 | int target = bitmap_bit_p (b, i); | |
3095 | congruence_class *tc = newclasses[target]; | |
3096 | ||
3097 | add_item_to_class (tc, cls->members[i]); | |
3098 | } | |
3099 | ||
b2b29377 MM |
3100 | if (flag_checking) |
3101 | { | |
3102 | for (unsigned int i = 0; i < 2; i++) | |
3103 | gcc_assert (newclasses[i]->members.length ()); | |
3104 | } | |
b84d4347 ML |
3105 | |
3106 | if (splitter_cls == cls) | |
3107 | optimizer->splitter_class_removed = true; | |
3108 | ||
3109 | /* Remove old class from worklist if presented. */ | |
3110 | bool in_worklist = cls->in_worklist; | |
3111 | ||
3112 | if (in_worklist) | |
3113 | cls->in_worklist = false; | |
3114 | ||
3115 | congruence_class_group g; | |
3116 | g.hash = cls->members[0]->get_hash (); | |
3117 | g.type = cls->members[0]->type; | |
3118 | ||
df8391b4 | 3119 | congruence_class_group *slot = optimizer->m_classes.find (&g); |
b84d4347 ML |
3120 | |
3121 | for (unsigned int i = 0; i < slot->classes.length (); i++) | |
3122 | if (slot->classes[i] == cls) | |
3123 | { | |
3124 | slot->classes.ordered_remove (i); | |
3125 | break; | |
3126 | } | |
3127 | ||
3128 | /* New class will be inserted and integrated to work list. */ | |
3129 | for (unsigned int i = 0; i < 2; i++) | |
3130 | optimizer->add_class (newclasses[i]); | |
3131 | ||
3132 | /* Two classes replace one, so that increment just by one. */ | |
3133 | optimizer->m_classes_count++; | |
3134 | ||
3135 | /* If OLD class was presented in the worklist, we remove the class | |
3136 | and replace it will both newly created classes. */ | |
3137 | if (in_worklist) | |
3138 | for (unsigned int i = 0; i < 2; i++) | |
3139 | optimizer->worklist_push (newclasses[i]); | |
3140 | else /* Just smaller class is inserted. */ | |
3141 | { | |
df8391b4 JJ |
3142 | unsigned int smaller_index |
3143 | = (newclasses[0]->members.length () | |
3144 | < newclasses[1]->members.length () | |
3145 | ? 0 : 1); | |
b84d4347 ML |
3146 | optimizer->worklist_push (newclasses[smaller_index]); |
3147 | } | |
3148 | ||
3149 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
3150 | { | |
3151 | fprintf (dump_file, " congruence class splitted:\n"); | |
3152 | cls->dump (dump_file, 4); | |
3153 | ||
3154 | fprintf (dump_file, " newly created groups:\n"); | |
3155 | for (unsigned int i = 0; i < 2; i++) | |
3156 | newclasses[i]->dump (dump_file, 4); | |
3157 | } | |
3158 | ||
3159 | /* Release class if not presented in work list. */ | |
3160 | if (!in_worklist) | |
3161 | delete cls; | |
3162 | } | |
3163 | ||
3164 | ||
3165 | return true; | |
3166 | } | |
3167 | ||
3168 | /* Tests if a class CLS used as INDEXth splits any congruence classes. | |
3169 | Bitmap stack BMSTACK is used for bitmap allocation. */ | |
3170 | ||
3171 | void | |
3172 | sem_item_optimizer::do_congruence_step_for_index (congruence_class *cls, | |
df8391b4 | 3173 | unsigned int index) |
b84d4347 ML |
3174 | { |
3175 | hash_map <congruence_class *, bitmap> split_map; | |
3176 | ||
3177 | for (unsigned int i = 0; i < cls->members.length (); i++) | |
3178 | { | |
3179 | sem_item *item = cls->members[i]; | |
3180 | ||
3181 | /* Iterate all usages that have INDEX as usage of the item. */ | |
3182 | for (unsigned int j = 0; j < item->usages.length (); j++) | |
3183 | { | |
3184 | sem_usage_pair *usage = item->usages[j]; | |
3185 | ||
3186 | if (usage->index != index) | |
3187 | continue; | |
3188 | ||
3189 | bitmap *slot = split_map.get (usage->item->cls); | |
3190 | bitmap b; | |
3191 | ||
3192 | if(!slot) | |
3193 | { | |
3194 | b = BITMAP_ALLOC (&m_bmstack); | |
3195 | split_map.put (usage->item->cls, b); | |
3196 | } | |
3197 | else | |
3198 | b = *slot; | |
3199 | ||
b84d4347 | 3200 | gcc_checking_assert (usage->item->cls); |
df8391b4 JJ |
3201 | gcc_checking_assert (usage->item->index_in_class |
3202 | < usage->item->cls->members.length ()); | |
b84d4347 ML |
3203 | |
3204 | bitmap_set_bit (b, usage->item->index_in_class); | |
3205 | } | |
3206 | } | |
3207 | ||
3208 | traverse_split_pair pair; | |
3209 | pair.optimizer = this; | |
3210 | pair.cls = cls; | |
3211 | ||
3212 | splitter_class_removed = false; | |
df8391b4 JJ |
3213 | split_map.traverse <traverse_split_pair *, |
3214 | sem_item_optimizer::traverse_congruence_split> (&pair); | |
b84d4347 ML |
3215 | |
3216 | /* Bitmap clean-up. */ | |
df8391b4 JJ |
3217 | split_map.traverse <traverse_split_pair *, |
3218 | sem_item_optimizer::release_split_map> (NULL); | |
b84d4347 ML |
3219 | } |
3220 | ||
3221 | /* Every usage of a congruence class CLS is a candidate that can split the | |
3222 | collection of classes. Bitmap stack BMSTACK is used for bitmap | |
3223 | allocation. */ | |
3224 | ||
3225 | void | |
3226 | sem_item_optimizer::do_congruence_step (congruence_class *cls) | |
3227 | { | |
3228 | bitmap_iterator bi; | |
3229 | unsigned int i; | |
3230 | ||
3231 | bitmap usage = BITMAP_ALLOC (&m_bmstack); | |
3232 | ||
3233 | for (unsigned int i = 0; i < cls->members.length (); i++) | |
3234 | bitmap_ior_into (usage, cls->members[i]->usage_index_bitmap); | |
3235 | ||
3236 | EXECUTE_IF_SET_IN_BITMAP (usage, 0, i, bi) | |
3237 | { | |
3238 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
df8391b4 JJ |
3239 | fprintf (dump_file, " processing congruence step for class: %u, " |
3240 | "index: %u\n", cls->id, i); | |
b84d4347 ML |
3241 | |
3242 | do_congruence_step_for_index (cls, i); | |
3243 | ||
3244 | if (splitter_class_removed) | |
3245 | break; | |
3246 | } | |
3247 | ||
3248 | BITMAP_FREE (usage); | |
3249 | } | |
3250 | ||
3251 | /* Adds a newly created congruence class CLS to worklist. */ | |
3252 | ||
3253 | void | |
3254 | sem_item_optimizer::worklist_push (congruence_class *cls) | |
3255 | { | |
3256 | /* Return if the class CLS is already presented in work list. */ | |
3257 | if (cls->in_worklist) | |
3258 | return; | |
3259 | ||
3260 | cls->in_worklist = true; | |
3261 | worklist.push_back (cls); | |
3262 | } | |
3263 | ||
3264 | /* Pops a class from worklist. */ | |
3265 | ||
3266 | congruence_class * | |
3267 | sem_item_optimizer::worklist_pop (void) | |
3268 | { | |
3269 | congruence_class *cls; | |
3270 | ||
3271 | while (!worklist.empty ()) | |
3272 | { | |
3273 | cls = worklist.front (); | |
3274 | worklist.pop_front (); | |
3275 | if (cls->in_worklist) | |
3276 | { | |
3277 | cls->in_worklist = false; | |
3278 | ||
3279 | return cls; | |
3280 | } | |
3281 | else | |
3282 | { | |
3283 | /* Work list item was already intended to be removed. | |
3284 | The only reason for doing it is to split a class. | |
3285 | Thus, the class CLS is deleted. */ | |
3286 | delete cls; | |
3287 | } | |
3288 | } | |
3289 | ||
3290 | return NULL; | |
3291 | } | |
3292 | ||
3293 | /* Iterative congruence reduction function. */ | |
3294 | ||
3295 | void | |
3296 | sem_item_optimizer::process_cong_reduction (void) | |
3297 | { | |
3746a4b2 ML |
3298 | for (hash_table<congruence_class_hash>::iterator it = m_classes.begin (); |
3299 | it != m_classes.end (); ++it) | |
3300 | for (unsigned i = 0; i < (*it)->classes.length (); i++) | |
3301 | if ((*it)->classes[i]->is_class_used ()) | |
3302 | worklist_push ((*it)->classes[i]); | |
b84d4347 ML |
3303 | |
3304 | if (dump_file) | |
3305 | fprintf (dump_file, "Worklist has been filled with: %lu\n", | |
10568163 | 3306 | (unsigned long) worklist.size ()); |
b84d4347 ML |
3307 | |
3308 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
3309 | fprintf (dump_file, "Congruence class reduction\n"); | |
3310 | ||
3311 | congruence_class *cls; | |
5ebd0e61 ML |
3312 | |
3313 | /* Process complete congruence reduction. */ | |
b84d4347 ML |
3314 | while ((cls = worklist_pop ()) != NULL) |
3315 | do_congruence_step (cls); | |
5ebd0e61 ML |
3316 | |
3317 | /* Subdivide newly created classes according to references. */ | |
3318 | unsigned new_classes = subdivide_classes_by_sensitive_refs (); | |
3319 | ||
3320 | if (dump_file) | |
3321 | fprintf (dump_file, "Address reference subdivision created: %u " | |
3322 | "new classes.\n", new_classes); | |
b84d4347 ML |
3323 | } |
3324 | ||
3325 | /* Debug function prints all informations about congruence classes. */ | |
3326 | ||
3327 | void | |
3328 | sem_item_optimizer::dump_cong_classes (void) | |
3329 | { | |
3330 | if (!dump_file) | |
3331 | return; | |
3332 | ||
3333 | fprintf (dump_file, | |
df8391b4 JJ |
3334 | "Congruence classes: %u (unique hash values: %lu), with total: " |
3335 | "%u items\n", m_classes_count, | |
3336 | (unsigned long) m_classes.elements (), m_items.length ()); | |
b84d4347 ML |
3337 | |
3338 | /* Histogram calculation. */ | |
3339 | unsigned int max_index = 0; | |
3340 | unsigned int* histogram = XCNEWVEC (unsigned int, m_items.length () + 1); | |
3341 | ||
3746a4b2 ML |
3342 | for (hash_table<congruence_class_hash>::iterator it = m_classes.begin (); |
3343 | it != m_classes.end (); ++it) | |
3344 | for (unsigned i = 0; i < (*it)->classes.length (); i++) | |
b84d4347 | 3345 | { |
3746a4b2 | 3346 | unsigned int c = (*it)->classes[i]->members.length (); |
b84d4347 ML |
3347 | histogram[c]++; |
3348 | ||
3349 | if (c > max_index) | |
3350 | max_index = c; | |
3351 | } | |
3352 | ||
3353 | fprintf (dump_file, | |
df8391b4 JJ |
3354 | "Class size histogram [num of members]: number of classe number " |
3355 | "of classess\n"); | |
b84d4347 ML |
3356 | |
3357 | for (unsigned int i = 0; i <= max_index; i++) | |
3358 | if (histogram[i]) | |
3359 | fprintf (dump_file, "[%u]: %u classes\n", i, histogram[i]); | |
3360 | ||
3361 | fprintf (dump_file, "\n\n"); | |
3362 | ||
b84d4347 | 3363 | if (dump_flags & TDF_DETAILS) |
3746a4b2 ML |
3364 | for (hash_table<congruence_class_hash>::iterator it = m_classes.begin (); |
3365 | it != m_classes.end (); ++it) | |
b84d4347 | 3366 | { |
df8391b4 | 3367 | fprintf (dump_file, " group: with %u classes:\n", |
3746a4b2 | 3368 | (*it)->classes.length ()); |
b84d4347 | 3369 | |
3746a4b2 | 3370 | for (unsigned i = 0; i < (*it)->classes.length (); i++) |
b84d4347 | 3371 | { |
3746a4b2 | 3372 | (*it)->classes[i]->dump (dump_file, 4); |
b84d4347 | 3373 | |
3746a4b2 | 3374 | if (i < (*it)->classes.length () - 1) |
b84d4347 ML |
3375 | fprintf (dump_file, " "); |
3376 | } | |
3377 | } | |
3378 | ||
3379 | free (histogram); | |
3380 | } | |
3381 | ||
a0843aed ML |
3382 | /* Sort pair of sem_items A and B by DECL_UID. */ |
3383 | ||
3384 | static int | |
3385 | sort_sem_items_by_decl_uid (const void *a, const void *b) | |
3386 | { | |
3387 | const sem_item *i1 = *(const sem_item * const *)a; | |
3388 | const sem_item *i2 = *(const sem_item * const *)b; | |
3389 | ||
3390 | int uid1 = DECL_UID (i1->decl); | |
3391 | int uid2 = DECL_UID (i2->decl); | |
3392 | ||
3393 | if (uid1 < uid2) | |
3394 | return -1; | |
3395 | else if (uid1 > uid2) | |
3396 | return 1; | |
3397 | else | |
3398 | return 0; | |
3399 | } | |
3400 | ||
3401 | /* Sort pair of congruence_classes A and B by DECL_UID of the first member. */ | |
3402 | ||
3403 | static int | |
3404 | sort_congruence_classes_by_decl_uid (const void *a, const void *b) | |
3405 | { | |
3406 | const congruence_class *c1 = *(const congruence_class * const *)a; | |
3407 | const congruence_class *c2 = *(const congruence_class * const *)b; | |
3408 | ||
3409 | int uid1 = DECL_UID (c1->members[0]->decl); | |
3410 | int uid2 = DECL_UID (c2->members[0]->decl); | |
3411 | ||
3412 | if (uid1 < uid2) | |
3413 | return -1; | |
3414 | else if (uid1 > uid2) | |
3415 | return 1; | |
3416 | else | |
3417 | return 0; | |
3418 | } | |
3419 | ||
3420 | /* Sort pair of congruence_class_groups A and B by | |
3421 | DECL_UID of the first member of a first group. */ | |
3422 | ||
3423 | static int | |
3424 | sort_congruence_class_groups_by_decl_uid (const void *a, const void *b) | |
3425 | { | |
3426 | const congruence_class_group *g1 | |
3427 | = *(const congruence_class_group * const *)a; | |
3428 | const congruence_class_group *g2 | |
3429 | = *(const congruence_class_group * const *)b; | |
3430 | ||
3431 | int uid1 = DECL_UID (g1->classes[0]->members[0]->decl); | |
3432 | int uid2 = DECL_UID (g2->classes[0]->members[0]->decl); | |
3433 | ||
3434 | if (uid1 < uid2) | |
3435 | return -1; | |
3436 | else if (uid1 > uid2) | |
3437 | return 1; | |
3438 | else | |
3439 | return 0; | |
3440 | } | |
3441 | ||
b84d4347 ML |
3442 | /* After reduction is done, we can declare all items in a group |
3443 | to be equal. PREV_CLASS_COUNT is start number of classes | |
bd31fe14 ML |
3444 | before reduction. True is returned if there's a merge operation |
3445 | processed. */ | |
b84d4347 | 3446 | |
bd31fe14 | 3447 | bool |
b84d4347 ML |
3448 | sem_item_optimizer::merge_classes (unsigned int prev_class_count) |
3449 | { | |
3450 | unsigned int item_count = m_items.length (); | |
3451 | unsigned int class_count = m_classes_count; | |
3452 | unsigned int equal_items = item_count - class_count; | |
3453 | ||
3454 | unsigned int non_singular_classes_count = 0; | |
3455 | unsigned int non_singular_classes_sum = 0; | |
3456 | ||
bd31fe14 ML |
3457 | bool merged_p = false; |
3458 | ||
a0843aed ML |
3459 | /* PR lto/78211 |
3460 | Sort functions in congruence classes by DECL_UID and do the same | |
3461 | for the classes to not to break -fcompare-debug. */ | |
3462 | ||
3463 | for (hash_table<congruence_class_hash>::iterator it = m_classes.begin (); | |
3464 | it != m_classes.end (); ++it) | |
3465 | { | |
3466 | for (unsigned int i = 0; i < (*it)->classes.length (); i++) | |
3467 | { | |
3468 | congruence_class *c = (*it)->classes[i]; | |
3469 | c->members.qsort (sort_sem_items_by_decl_uid); | |
3470 | } | |
3471 | ||
3472 | (*it)->classes.qsort (sort_congruence_classes_by_decl_uid); | |
3473 | } | |
3474 | ||
3746a4b2 ML |
3475 | for (hash_table<congruence_class_hash>::iterator it = m_classes.begin (); |
3476 | it != m_classes.end (); ++it) | |
3477 | for (unsigned int i = 0; i < (*it)->classes.length (); i++) | |
b84d4347 | 3478 | { |
3746a4b2 | 3479 | congruence_class *c = (*it)->classes[i]; |
b84d4347 ML |
3480 | if (c->members.length () > 1) |
3481 | { | |
3482 | non_singular_classes_count++; | |
3483 | non_singular_classes_sum += c->members.length (); | |
3484 | } | |
3485 | } | |
3486 | ||
a0843aed ML |
3487 | auto_vec <congruence_class_group *> classes (m_classes.elements ()); |
3488 | for (hash_table<congruence_class_hash>::iterator it = m_classes.begin (); | |
3489 | it != m_classes.end (); ++it) | |
3490 | classes.quick_push (*it); | |
3491 | ||
3492 | classes.qsort (sort_congruence_class_groups_by_decl_uid); | |
3493 | ||
b84d4347 ML |
3494 | if (dump_file) |
3495 | { | |
3496 | fprintf (dump_file, "\nItem count: %u\n", item_count); | |
3497 | fprintf (dump_file, "Congruent classes before: %u, after: %u\n", | |
3498 | prev_class_count, class_count); | |
3499 | fprintf (dump_file, "Average class size before: %.2f, after: %.2f\n", | |
f1c859ee ML |
3500 | prev_class_count ? 1.0f * item_count / prev_class_count : 0.0f, |
3501 | class_count ? 1.0f * item_count / class_count : 0.0f); | |
b84d4347 | 3502 | fprintf (dump_file, "Average non-singular class size: %.2f, count: %u\n", |
f1c859ee ML |
3503 | non_singular_classes_count ? 1.0f * non_singular_classes_sum / |
3504 | non_singular_classes_count : 0.0f, | |
b84d4347 ML |
3505 | non_singular_classes_count); |
3506 | fprintf (dump_file, "Equal symbols: %u\n", equal_items); | |
3507 | fprintf (dump_file, "Fraction of visited symbols: %.2f%%\n\n", | |
f1c859ee | 3508 | item_count ? 100.0f * equal_items / item_count : 0.0f); |
b84d4347 ML |
3509 | } |
3510 | ||
a0843aed ML |
3511 | unsigned int l; |
3512 | congruence_class_group *it; | |
3513 | FOR_EACH_VEC_ELT (classes, l, it) | |
3514 | for (unsigned int i = 0; i < it->classes.length (); i++) | |
b84d4347 | 3515 | { |
a0843aed | 3516 | congruence_class *c = it->classes[i]; |
b84d4347 ML |
3517 | |
3518 | if (c->members.length () == 1) | |
3519 | continue; | |
3520 | ||
b84d4347 ML |
3521 | sem_item *source = c->members[0]; |
3522 | ||
78fcec3f JH |
3523 | if (DECL_NAME (source->decl) |
3524 | && MAIN_NAME_P (DECL_NAME (source->decl))) | |
aa398781 NS |
3525 | /* If merge via wrappers, picking main as the target can be |
3526 | problematic. */ | |
3527 | source = c->members[1]; | |
3528 | ||
3529 | for (unsigned int j = 0; j < c->members.length (); j++) | |
b84d4347 ML |
3530 | { |
3531 | sem_item *alias = c->members[j]; | |
b84d4347 | 3532 | |
aa398781 NS |
3533 | if (alias == source) |
3534 | continue; | |
3535 | ||
b84d4347 ML |
3536 | if (dump_file) |
3537 | { | |
3538 | fprintf (dump_file, "Semantic equality hit:%s->%s\n", | |
1aec2ecc ML |
3539 | xstrdup_for_dump (source->node->name ()), |
3540 | xstrdup_for_dump (alias->node->name ())); | |
b84d4347 | 3541 | fprintf (dump_file, "Assembler symbol names:%s->%s\n", |
1aec2ecc ML |
3542 | xstrdup_for_dump (source->node->asm_name ()), |
3543 | xstrdup_for_dump (alias->node->asm_name ())); | |
b84d4347 ML |
3544 | } |
3545 | ||
185c9e56 ML |
3546 | if (lookup_attribute ("no_icf", DECL_ATTRIBUTES (alias->decl))) |
3547 | { | |
3548 | if (dump_file) | |
3549 | fprintf (dump_file, | |
3550 | "Merge operation is skipped due to no_icf " | |
3551 | "attribute.\n\n"); | |
3552 | ||
3553 | continue; | |
3554 | } | |
3555 | ||
b84d4347 ML |
3556 | if (dump_file && (dump_flags & TDF_DETAILS)) |
3557 | { | |
3558 | source->dump_to_file (dump_file); | |
3559 | alias->dump_to_file (dump_file); | |
3560 | } | |
3561 | ||
7aeb92b4 ML |
3562 | if (dbg_cnt (merged_ipa_icf)) |
3563 | merged_p |= source->merge (alias); | |
b84d4347 ML |
3564 | } |
3565 | } | |
bd31fe14 ML |
3566 | |
3567 | return merged_p; | |
b84d4347 ML |
3568 | } |
3569 | ||
3570 | /* Dump function prints all class members to a FILE with an INDENT. */ | |
3571 | ||
3572 | void | |
3573 | congruence_class::dump (FILE *file, unsigned int indent) const | |
3574 | { | |
3575 | FPRINTF_SPACES (file, indent, "class with id: %u, hash: %u, items: %u\n", | |
3576 | id, members[0]->get_hash (), members.length ()); | |
3577 | ||
3578 | FPUTS_SPACES (file, indent + 2, ""); | |
3579 | for (unsigned i = 0; i < members.length (); i++) | |
1aec2ecc ML |
3580 | fprintf (file, "%s(%p/%u) ", members[i]->node->asm_name (), |
3581 | (void *) members[i]->decl, | |
b84d4347 ML |
3582 | members[i]->node->order); |
3583 | ||
3584 | fprintf (file, "\n"); | |
3585 | } | |
3586 | ||
3587 | /* Returns true if there's a member that is used from another group. */ | |
3588 | ||
3589 | bool | |
3590 | congruence_class::is_class_used (void) | |
3591 | { | |
3592 | for (unsigned int i = 0; i < members.length (); i++) | |
3593 | if (members[i]->usages.length ()) | |
3594 | return true; | |
3595 | ||
3596 | return false; | |
3597 | } | |
3598 | ||
b84d4347 ML |
3599 | /* Generate pass summary for IPA ICF pass. */ |
3600 | ||
3601 | static void | |
3602 | ipa_icf_generate_summary (void) | |
3603 | { | |
3604 | if (!optimizer) | |
3605 | optimizer = new sem_item_optimizer (); | |
3606 | ||
e3e968e9 | 3607 | optimizer->register_hooks (); |
b84d4347 ML |
3608 | optimizer->parse_funcs_and_vars (); |
3609 | } | |
3610 | ||
3611 | /* Write pass summary for IPA ICF pass. */ | |
3612 | ||
3613 | static void | |
3614 | ipa_icf_write_summary (void) | |
3615 | { | |
3616 | gcc_assert (optimizer); | |
3617 | ||
3618 | optimizer->write_summary (); | |
3619 | } | |
3620 | ||
3621 | /* Read pass summary for IPA ICF pass. */ | |
3622 | ||
3623 | static void | |
3624 | ipa_icf_read_summary (void) | |
3625 | { | |
3626 | if (!optimizer) | |
3627 | optimizer = new sem_item_optimizer (); | |
3628 | ||
3629 | optimizer->read_summary (); | |
3630 | optimizer->register_hooks (); | |
3631 | } | |
3632 | ||
3633 | /* Semantic equality exection function. */ | |
3634 | ||
3635 | static unsigned int | |
3636 | ipa_icf_driver (void) | |
3637 | { | |
3638 | gcc_assert (optimizer); | |
3639 | ||
bd31fe14 | 3640 | bool merged_p = optimizer->execute (); |
b84d4347 ML |
3641 | |
3642 | delete optimizer; | |
9612a39a | 3643 | optimizer = NULL; |
b84d4347 | 3644 | |
bd31fe14 | 3645 | return merged_p ? TODO_remove_functions : 0; |
b84d4347 ML |
3646 | } |
3647 | ||
3648 | const pass_data pass_data_ipa_icf = | |
3649 | { | |
3650 | IPA_PASS, /* type */ | |
3651 | "icf", /* name */ | |
3652 | OPTGROUP_IPA, /* optinfo_flags */ | |
3653 | TV_IPA_ICF, /* tv_id */ | |
3654 | 0, /* properties_required */ | |
3655 | 0, /* properties_provided */ | |
3656 | 0, /* properties_destroyed */ | |
3657 | 0, /* todo_flags_start */ | |
3658 | 0, /* todo_flags_finish */ | |
3659 | }; | |
3660 | ||
3661 | class pass_ipa_icf : public ipa_opt_pass_d | |
3662 | { | |
3663 | public: | |
3664 | pass_ipa_icf (gcc::context *ctxt) | |
3665 | : ipa_opt_pass_d (pass_data_ipa_icf, ctxt, | |
3666 | ipa_icf_generate_summary, /* generate_summary */ | |
3667 | ipa_icf_write_summary, /* write_summary */ | |
3668 | ipa_icf_read_summary, /* read_summary */ | |
3669 | NULL, /* | |
3670 | write_optimization_summary */ | |
3671 | NULL, /* | |
3672 | read_optimization_summary */ | |
3673 | NULL, /* stmt_fixup */ | |
3674 | 0, /* function_transform_todo_flags_start */ | |
3675 | NULL, /* function_transform */ | |
3676 | NULL) /* variable_transform */ | |
3677 | {} | |
3678 | ||
3679 | /* opt_pass methods: */ | |
3680 | virtual bool gate (function *) | |
3681 | { | |
b16650ac | 3682 | return in_lto_p || flag_ipa_icf_variables || flag_ipa_icf_functions; |
b84d4347 ML |
3683 | } |
3684 | ||
3685 | virtual unsigned int execute (function *) | |
3686 | { | |
3687 | return ipa_icf_driver(); | |
3688 | } | |
3689 | }; // class pass_ipa_icf | |
3690 | ||
3691 | } // ipa_icf namespace | |
3692 | ||
3693 | ipa_opt_pass_d * | |
3694 | make_pass_ipa_icf (gcc::context *ctxt) | |
3695 | { | |
3696 | return new ipa_icf::pass_ipa_icf (ctxt); | |
3697 | } |