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1 | /* Classes for modeling the state of memory. |
2 | Copyright (C) 2019-2020 Free Software Foundation, Inc. | |
3 | Contributed by David Malcolm <dmalcolm@redhat.com>. | |
4 | ||
5 | This file is part of GCC. | |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3, or (at your option) | |
10 | any later version. | |
11 | ||
12 | GCC is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GCC; see the file COPYING3. If not see | |
19 | <http://www.gnu.org/licenses/>. */ | |
20 | ||
21 | #include "config.h" | |
22 | #include "system.h" | |
23 | #include "coretypes.h" | |
24 | #include "tree.h" | |
25 | #include "function.h" | |
26 | #include "basic-block.h" | |
27 | #include "gimple.h" | |
28 | #include "gimple-iterator.h" | |
29 | #include "graphviz.h" | |
30 | #include "options.h" | |
31 | #include "cgraph.h" | |
32 | #include "tree-dfa.h" | |
33 | #include "stringpool.h" | |
34 | #include "convert.h" | |
35 | #include "target.h" | |
36 | #include "fold-const.h" | |
37 | #include "tree-pretty-print.h" | |
38 | #include "diagnostic-color.h" | |
39 | #include "diagnostic-metadata.h" | |
40 | #include "diagnostic-core.h" | |
41 | #include "tristate.h" | |
42 | #include "selftest.h" | |
43 | #include "function.h" | |
44 | #include "analyzer/analyzer.h" | |
45 | #include "analyzer/analyzer-logging.h" | |
46 | #include "ordered-hash-map.h" | |
47 | #include "options.h" | |
48 | #include "cgraph.h" | |
49 | #include "cfg.h" | |
50 | #include "digraph.h" | |
51 | #include "analyzer/supergraph.h" | |
52 | #include "sbitmap.h" | |
53 | #include "analyzer/region-model.h" | |
54 | #include "analyzer/constraint-manager.h" | |
55 | #include "diagnostic-event-id.h" | |
56 | #include "analyzer/sm.h" | |
57 | #include "diagnostic-event-id.h" | |
58 | #include "analyzer/sm.h" | |
59 | #include "analyzer/pending-diagnostic.h" | |
60 | #include "analyzer/analyzer-selftests.h" | |
61 | ||
62 | #if ENABLE_ANALYZER | |
63 | ||
64 | /* Dump T to PP in language-independent form, for debugging/logging/dumping | |
65 | purposes. */ | |
66 | ||
67 | static void | |
68 | dump_tree (pretty_printer *pp, tree t) | |
69 | { | |
70 | dump_generic_node (pp, t, 0, TDF_SLIM, 0); | |
71 | } | |
72 | ||
73 | /* Dump this path_var to PP (which must support %E for trees). | |
74 | ||
75 | Express the stack depth using an "@DEPTH" suffix, so e.g. given | |
76 | void foo (int j); | |
77 | void bar (int i) | |
78 | { | |
79 | foo (i); | |
80 | } | |
81 | then: | |
82 | - the "i" in "bar" would be "(i @ 0)" | |
83 | - the "j" in "foo" would be "(j @ 1)". */ | |
84 | ||
85 | void | |
86 | path_var::dump (pretty_printer *pp) const | |
87 | { | |
88 | PUSH_IGNORE_WFORMAT | |
89 | if (m_tree == NULL_TREE) | |
90 | pp_string (pp, "NULL"); | |
91 | if (CONSTANT_CLASS_P (m_tree)) | |
92 | pp_printf (pp, "%qE", m_tree); | |
93 | else | |
94 | pp_printf (pp, "(%qE @ %i)", m_tree, m_stack_depth); | |
95 | POP_IGNORE_WFORMAT | |
96 | } | |
97 | ||
98 | /* For use in printing a comma-separated list. */ | |
99 | ||
100 | static void | |
101 | dump_separator (pretty_printer *pp, bool *is_first) | |
102 | { | |
103 | if (!*is_first) | |
104 | pp_string (pp, ", "); | |
105 | *is_first = false; | |
106 | } | |
107 | ||
108 | /* Concrete subclass of constraint_manager that wires it up to a region_model | |
109 | (whilst allowing the constraint_manager and region_model to be somewhat | |
110 | at arms length). | |
111 | TODO: revisit this; maybe put the region_model * into the constraint_manager | |
112 | base class. */ | |
113 | ||
114 | class impl_constraint_manager : public constraint_manager | |
115 | { | |
116 | public: | |
117 | impl_constraint_manager (region_model *model) | |
118 | : constraint_manager (), | |
119 | m_model (model) | |
120 | {} | |
121 | ||
122 | impl_constraint_manager (const impl_constraint_manager &other, | |
123 | region_model *model) | |
124 | : constraint_manager (other), | |
125 | m_model (model) | |
126 | {} | |
127 | ||
128 | constraint_manager *clone (region_model *model) const | |
129 | { | |
130 | return new impl_constraint_manager (*this, model); | |
131 | } | |
132 | ||
133 | tree maybe_get_constant (svalue_id sid) const FINAL OVERRIDE | |
134 | { | |
135 | svalue *svalue = m_model->get_svalue (sid); | |
136 | return svalue->maybe_get_constant (); | |
137 | } | |
138 | ||
139 | svalue_id get_sid_for_constant (tree cst) const FINAL OVERRIDE | |
140 | { | |
141 | gcc_assert (CONSTANT_CLASS_P (cst)); | |
142 | return m_model->get_rvalue (cst, NULL); | |
143 | } | |
144 | ||
145 | int get_num_svalues () const FINAL OVERRIDE | |
146 | { | |
147 | return m_model->get_num_svalues (); | |
148 | } | |
149 | ||
150 | private: | |
151 | region_model *m_model; | |
152 | }; | |
153 | ||
154 | /* class svalue_id. */ | |
155 | ||
156 | /* Print this svalue_id to PP. */ | |
157 | ||
158 | void | |
159 | svalue_id::print (pretty_printer *pp) const | |
160 | { | |
161 | if (null_p ()) | |
162 | pp_printf (pp, "null"); | |
163 | else | |
164 | pp_printf (pp, "sv%i", m_idx); | |
165 | } | |
166 | ||
167 | /* Print this svalue_id in .dot format to PP. */ | |
168 | ||
169 | void | |
170 | svalue_id::dump_node_name_to_pp (pretty_printer *pp) const | |
171 | { | |
172 | gcc_assert (!null_p ()); | |
173 | pp_printf (pp, "svalue_%i", m_idx); | |
174 | } | |
175 | ||
176 | /* Assert that this object is valid (w.r.t. MODEL). */ | |
177 | ||
178 | void | |
179 | svalue_id::validate (const region_model &model) const | |
180 | { | |
181 | gcc_assert (null_p () || m_idx < (int)model.get_num_svalues ()); | |
182 | } | |
183 | ||
184 | /* class region_id. */ | |
185 | ||
186 | /* Print this region_id to PP. */ | |
187 | ||
188 | void | |
189 | region_id::print (pretty_printer *pp) const | |
190 | { | |
191 | if (null_p ()) | |
192 | pp_printf (pp, "null"); | |
193 | else | |
194 | pp_printf (pp, "r%i", m_idx); | |
195 | } | |
196 | ||
197 | /* Print this region_id in .dot format to PP. */ | |
198 | ||
199 | void | |
200 | region_id::dump_node_name_to_pp (pretty_printer *pp) const | |
201 | { | |
202 | gcc_assert (!null_p ()); | |
203 | pp_printf (pp, "region_%i", m_idx); | |
204 | } | |
205 | ||
206 | /* Assert that this object is valid (w.r.t. MODEL). */ | |
207 | ||
208 | void | |
209 | region_id::validate (const region_model &model) const | |
210 | { | |
211 | gcc_assert (null_p () || m_idx < (int)model.get_num_regions ()); | |
212 | } | |
213 | ||
214 | /* class id_set. */ | |
215 | ||
216 | /* id_set<region_id>'s ctor. */ | |
217 | ||
218 | template<> | |
219 | id_set<region_id>::id_set (const region_model *model) | |
220 | : m_bitmap (model->get_num_regions ()) | |
221 | { | |
222 | bitmap_clear (m_bitmap); | |
223 | } | |
224 | ||
225 | /* class svalue and its various subclasses. */ | |
226 | ||
227 | /* class svalue. */ | |
228 | ||
229 | /* svalue's equality operator. Most of the work is done by the | |
230 | a "compare_fields" implementation on each subclass. */ | |
231 | ||
232 | bool | |
233 | svalue::operator== (const svalue &other) const | |
234 | { | |
235 | enum svalue_kind this_kind = get_kind (); | |
236 | enum svalue_kind other_kind = other.get_kind (); | |
237 | if (this_kind != other_kind) | |
238 | return false; | |
239 | ||
240 | if (m_type != other.m_type) | |
241 | return false; | |
242 | ||
243 | switch (this_kind) | |
244 | { | |
245 | default: | |
246 | gcc_unreachable (); | |
247 | case SK_REGION: | |
248 | { | |
249 | const region_svalue &this_sub | |
250 | = (const region_svalue &)*this; | |
251 | const region_svalue &other_sub | |
252 | = (const region_svalue &)other; | |
253 | return this_sub.compare_fields (other_sub); | |
254 | } | |
255 | break; | |
256 | case SK_CONSTANT: | |
257 | { | |
258 | const constant_svalue &this_sub | |
259 | = (const constant_svalue &)*this; | |
260 | const constant_svalue &other_sub | |
261 | = (const constant_svalue &)other; | |
262 | return this_sub.compare_fields (other_sub); | |
263 | } | |
264 | break; | |
265 | case SK_UNKNOWN: | |
266 | { | |
267 | const unknown_svalue &this_sub | |
268 | = (const unknown_svalue &)*this; | |
269 | const unknown_svalue &other_sub | |
270 | = (const unknown_svalue &)other; | |
271 | return this_sub.compare_fields (other_sub); | |
272 | } | |
273 | break; | |
274 | case SK_POISONED: | |
275 | { | |
276 | const poisoned_svalue &this_sub | |
277 | = (const poisoned_svalue &)*this; | |
278 | const poisoned_svalue &other_sub | |
279 | = (const poisoned_svalue &)other; | |
280 | return this_sub.compare_fields (other_sub); | |
281 | } | |
282 | break; | |
283 | case SK_SETJMP: | |
284 | { | |
285 | const setjmp_svalue &this_sub | |
286 | = (const setjmp_svalue &)*this; | |
287 | const setjmp_svalue &other_sub | |
288 | = (const setjmp_svalue &)other; | |
289 | return this_sub.compare_fields (other_sub); | |
290 | } | |
291 | break; | |
292 | } | |
293 | } | |
294 | ||
295 | /* Generate a hash value for this svalue. Most of the work is done by the | |
296 | add_to_hash vfunc. */ | |
297 | ||
298 | hashval_t | |
299 | svalue::hash () const | |
300 | { | |
301 | inchash::hash hstate; | |
302 | if (m_type) | |
303 | hstate.add_int (TYPE_UID (m_type)); | |
304 | add_to_hash (hstate); | |
305 | return hstate.end (); | |
306 | } | |
307 | ||
308 | /* Print this svalue and its ID to PP. */ | |
309 | ||
310 | void | |
311 | svalue::print (const region_model &model, | |
312 | svalue_id this_sid, | |
313 | pretty_printer *pp) const | |
314 | { | |
315 | this_sid.print (pp); | |
316 | pp_string (pp, ": {"); | |
317 | ||
318 | PUSH_IGNORE_WFORMAT | |
319 | if (m_type) | |
320 | { | |
321 | gcc_assert (TYPE_P (m_type)); | |
322 | pp_printf (pp, "type: %qT, ", m_type); | |
323 | } | |
324 | POP_IGNORE_WFORMAT | |
325 | ||
326 | /* vfunc. */ | |
327 | print_details (model, this_sid, pp); | |
328 | ||
329 | pp_string (pp, "}"); | |
330 | } | |
331 | ||
332 | /* Dump this svalue in the form of a .dot record to PP. */ | |
333 | ||
334 | void | |
335 | svalue::dump_dot_to_pp (const region_model &model, | |
336 | svalue_id this_sid, | |
337 | pretty_printer *pp) const | |
338 | { | |
339 | this_sid.dump_node_name_to_pp (pp); | |
340 | pp_printf (pp, " [label=\""); | |
341 | pp_write_text_to_stream (pp); | |
342 | this_sid.print (pp); | |
343 | pp_string (pp, ": {"); | |
344 | print (model, this_sid, pp); | |
345 | pp_write_text_as_dot_label_to_stream (pp, /*for_record=*/false); | |
346 | pp_string (pp, "}\"];"); | |
347 | pp_newline (pp); | |
348 | } | |
349 | ||
350 | /* Base implementation of svalue::remap_region_ids vfunc. */ | |
351 | ||
352 | void | |
353 | svalue::remap_region_ids (const region_id_map &) | |
354 | { | |
355 | /* Empty. */ | |
356 | } | |
357 | ||
358 | /* Base implementation of svalue::walk_for_canonicalization vfunc. */ | |
359 | ||
360 | void | |
361 | svalue::walk_for_canonicalization (canonicalization *) const | |
362 | { | |
363 | /* Empty. */ | |
364 | } | |
365 | ||
366 | /* Base implementation of svalue::get_child_sid vfunc. */ | |
367 | ||
368 | svalue_id | |
369 | svalue::get_child_sid (region *parent ATTRIBUTE_UNUSED, | |
370 | region *child, | |
371 | region_model &model, | |
372 | region_model_context *ctxt ATTRIBUTE_UNUSED) | |
373 | { | |
374 | svalue *new_child_value = clone (); | |
375 | if (child->get_type ()) | |
376 | new_child_value->m_type = child->get_type (); | |
377 | svalue_id new_child_sid = model.add_svalue (new_child_value); | |
378 | return new_child_sid; | |
379 | } | |
380 | ||
381 | /* If this svalue is a constant_svalue, return the underlying tree constant. | |
382 | Otherwise return NULL_TREE. */ | |
383 | ||
384 | tree | |
385 | svalue::maybe_get_constant () const | |
386 | { | |
387 | if (const constant_svalue *cst_sval = dyn_cast_constant_svalue ()) | |
388 | return cst_sval->get_constant (); | |
389 | else | |
390 | return NULL_TREE; | |
391 | } | |
392 | ||
393 | /* class region_svalue : public svalue. */ | |
394 | ||
395 | /* Compare the fields of this region_svalue with OTHER, returning true | |
396 | if they are equal. | |
397 | For use by svalue::operator==. */ | |
398 | ||
399 | bool | |
400 | region_svalue::compare_fields (const region_svalue &other) const | |
401 | { | |
402 | return m_rid == other.m_rid; | |
403 | } | |
404 | ||
405 | /* Implementation of svalue::add_to_hash vfunc for region_svalue. */ | |
406 | ||
407 | void | |
408 | region_svalue::add_to_hash (inchash::hash &hstate) const | |
409 | { | |
410 | inchash::add (m_rid, hstate); | |
411 | } | |
412 | ||
413 | /* Implementation of svalue::print_details vfunc for region_svalue. */ | |
414 | ||
415 | void | |
416 | region_svalue::print_details (const region_model &model ATTRIBUTE_UNUSED, | |
417 | svalue_id this_sid ATTRIBUTE_UNUSED, | |
418 | pretty_printer *pp) const | |
419 | { | |
420 | if (m_rid.null_p ()) | |
421 | pp_string (pp, "NULL"); | |
422 | else | |
423 | { | |
424 | pp_string (pp, "&"); | |
425 | m_rid.print (pp); | |
426 | } | |
427 | } | |
428 | ||
429 | /* Implementation of svalue::dump_dot_to_pp for region_svalue. */ | |
430 | ||
431 | void | |
432 | region_svalue::dump_dot_to_pp (const region_model &model, | |
433 | svalue_id this_sid, | |
434 | pretty_printer *pp) const | |
435 | { | |
436 | svalue::dump_dot_to_pp (model, this_sid, pp); | |
437 | ||
438 | /* If non-NULL, add an edge to the pointed-to region. */ | |
439 | if (!m_rid.null_p ()) | |
440 | { | |
441 | this_sid.dump_node_name_to_pp (pp); | |
442 | pp_string (pp, " -> "); | |
443 | m_rid.dump_node_name_to_pp (pp); | |
444 | pp_string (pp, ";"); | |
445 | pp_newline (pp); | |
446 | } | |
447 | } | |
448 | ||
449 | /* Implementation of svalue::remap_region_ids vfunc for region_svalue. */ | |
450 | ||
451 | void | |
452 | region_svalue::remap_region_ids (const region_id_map &map) | |
453 | { | |
454 | map.update (&m_rid); | |
455 | } | |
456 | ||
457 | /* Merge REGION_SVAL_A and REGION_SVAL_B using MERGER, writing the result | |
458 | into *MERGED_SID. */ | |
459 | ||
460 | void | |
461 | region_svalue::merge_values (const region_svalue ®ion_sval_a, | |
462 | const region_svalue ®ion_sval_b, | |
463 | svalue_id *merged_sid, | |
464 | tree type, | |
465 | model_merger *merger) | |
466 | { | |
467 | region_id a_rid = region_sval_a.get_pointee (); | |
468 | region_id b_rid = region_sval_b.get_pointee (); | |
469 | ||
470 | /* Both are non-NULL. */ | |
471 | gcc_assert (!a_rid.null_p () && !b_rid.null_p ()); | |
472 | ||
473 | /* Have these ptr-values already been merged? */ | |
474 | ||
475 | region_id a_rid_in_m | |
476 | = merger->m_map_regions_from_a_to_m.get_dst_for_src (a_rid); | |
477 | region_id b_rid_in_m | |
478 | = merger->m_map_regions_from_b_to_m.get_dst_for_src (b_rid); | |
479 | ||
480 | /* "null_p" here means "we haven't seen this ptr-value before". | |
481 | If we've seen one but not the other, or we have different | |
482 | regions, then the merged ptr has to be "unknown". */ | |
483 | if (a_rid_in_m != b_rid_in_m) | |
484 | { | |
485 | svalue *merged_sval = new unknown_svalue (type); | |
486 | *merged_sid = merger->m_merged_model->add_svalue (merged_sval); | |
487 | return; | |
488 | } | |
489 | ||
490 | /* Have we seen this yet? If so, reuse the value. */ | |
491 | if (!a_rid_in_m.null_p ()) | |
492 | { | |
493 | *merged_sid | |
494 | = merger->m_merged_model->get_or_create_ptr_svalue (type, a_rid_in_m); | |
495 | return; | |
496 | } | |
497 | ||
498 | /* Otherwise we have A/B regions that haven't been referenced yet. */ | |
499 | ||
500 | /* Are the regions the "same", when seen from the tree point-of-view. | |
501 | If so, create a merged pointer to it. */ | |
502 | path_var pv_a = merger->m_model_a->get_representative_path_var (a_rid); | |
503 | path_var pv_b = merger->m_model_b->get_representative_path_var (b_rid); | |
504 | if (pv_a.m_tree | |
505 | && pv_a == pv_b) | |
506 | { | |
507 | region_id merged_pointee_rid | |
508 | = merger->m_merged_model->get_lvalue (pv_a, NULL); | |
509 | *merged_sid | |
510 | = merger->m_merged_model->get_or_create_ptr_svalue (type, | |
511 | merged_pointee_rid); | |
512 | merger->record_regions (a_rid, b_rid, merged_pointee_rid); | |
513 | return; | |
514 | } | |
515 | ||
516 | /* Handle an A/B pair of ptrs that both point at heap regions. | |
517 | If they both have a heap region in the merger model, merge them. */ | |
518 | region *region_a = merger->m_model_a->get_region (a_rid); | |
519 | region *region_b = merger->m_model_b->get_region (b_rid); | |
520 | region_id a_parent_rid = region_a->get_parent (); | |
521 | region_id b_parent_rid = region_b->get_parent (); | |
522 | region *parent_region_a = merger->m_model_a->get_region (a_parent_rid); | |
523 | region *parent_region_b = merger->m_model_b->get_region (b_parent_rid); | |
524 | if (parent_region_a | |
525 | && parent_region_b | |
526 | && parent_region_a->get_kind () == RK_HEAP | |
527 | && parent_region_b->get_kind () == RK_HEAP) | |
528 | { | |
529 | /* We have an A/B pair of ptrs that both point at heap regions. */ | |
530 | /* presumably we want to see if each A/B heap region already | |
531 | has a merged region, and, if so, is it the same one. */ | |
532 | // This check is above | |
533 | ||
534 | region_id merged_pointee_rid | |
535 | = merger->m_merged_model->add_new_malloc_region (); | |
536 | *merged_sid | |
537 | = merger->m_merged_model->get_or_create_ptr_svalue | |
538 | (type, merged_pointee_rid); | |
539 | merger->record_regions (a_rid, b_rid, merged_pointee_rid); | |
540 | return; | |
541 | } | |
542 | ||
543 | /* Two different non-NULL pointers? Merge to unknown. */ | |
544 | svalue *merged_sval = new unknown_svalue (type); | |
545 | *merged_sid = merger->m_merged_model->add_svalue (merged_sval); | |
546 | return; | |
547 | } | |
548 | ||
549 | /* Implementation of svalue::walk_for_canonicalization vfunc for | |
550 | region_svalue. */ | |
551 | ||
552 | void | |
553 | region_svalue::walk_for_canonicalization (canonicalization *c) const | |
554 | { | |
555 | c->walk_rid (m_rid); | |
556 | } | |
557 | ||
558 | /* Evaluate the condition LHS OP RHS. | |
559 | Subroutine of region_model::eval_condition for when we have a pair of | |
560 | pointers. */ | |
561 | ||
562 | tristate | |
563 | region_svalue::eval_condition (region_svalue *lhs, | |
564 | enum tree_code op, | |
565 | region_svalue *rhs) | |
566 | { | |
567 | /* See if they point to the same region. */ | |
568 | /* TODO: what about child regions where the child is the first child | |
569 | (or descendent)? */ | |
570 | region_id lhs_rid = lhs->get_pointee (); | |
571 | region_id rhs_rid = rhs->get_pointee (); | |
572 | switch (op) | |
573 | { | |
574 | default: | |
575 | gcc_unreachable (); | |
576 | ||
577 | case EQ_EXPR: | |
578 | if (lhs_rid == rhs_rid) | |
579 | return tristate::TS_TRUE; | |
580 | else | |
581 | return tristate::TS_FALSE; | |
582 | break; | |
583 | ||
584 | case NE_EXPR: | |
585 | if (lhs_rid != rhs_rid) | |
586 | return tristate::TS_TRUE; | |
587 | else | |
588 | return tristate::TS_FALSE; | |
589 | break; | |
590 | ||
591 | case GE_EXPR: | |
592 | case LE_EXPR: | |
593 | if (lhs_rid == rhs_rid) | |
594 | return tristate::TS_TRUE; | |
595 | break; | |
596 | ||
597 | case GT_EXPR: | |
598 | case LT_EXPR: | |
599 | if (lhs_rid == rhs_rid) | |
600 | return tristate::TS_FALSE; | |
601 | break; | |
602 | } | |
603 | ||
604 | return tristate::TS_UNKNOWN; | |
605 | } | |
606 | ||
607 | /* class constant_svalue : public svalue. */ | |
608 | ||
609 | /* Compare the fields of this constant_svalue with OTHER, returning true | |
610 | if they are equal. | |
611 | For use by svalue::operator==. */ | |
612 | ||
613 | bool | |
614 | constant_svalue::compare_fields (const constant_svalue &other) const | |
615 | { | |
616 | return m_cst_expr == other.m_cst_expr; | |
617 | } | |
618 | ||
619 | /* Implementation of svalue::add_to_hash vfunc for constant_svalue. */ | |
620 | ||
621 | void | |
622 | constant_svalue::add_to_hash (inchash::hash &hstate) const | |
623 | { | |
624 | inchash::add_expr (m_cst_expr, hstate); | |
625 | } | |
626 | ||
627 | /* Merge the CST_SVAL_A and CST_SVAL_B using MERGER, writing the id of | |
628 | the resulting svalue into *MERGED_SID. */ | |
629 | ||
630 | void | |
631 | constant_svalue::merge_values (const constant_svalue &cst_sval_a, | |
632 | const constant_svalue &cst_sval_b, | |
633 | svalue_id *merged_sid, | |
634 | model_merger *merger) | |
635 | { | |
636 | tree cst_a = cst_sval_a.get_constant (); | |
637 | tree cst_b = cst_sval_b.get_constant (); | |
638 | svalue *merged_sval; | |
639 | if (cst_a == cst_b) | |
640 | { | |
641 | /* If they are the same constant, merge as that constant value. */ | |
642 | merged_sval = new constant_svalue (cst_a); | |
643 | } | |
644 | else | |
645 | { | |
646 | /* Otherwise, we have two different constant values. | |
647 | Merge as an unknown value. | |
648 | TODO: impose constraints on the value? | |
649 | (maybe just based on A, to avoid infinite chains) */ | |
650 | merged_sval = new unknown_svalue (TREE_TYPE (cst_a)); | |
651 | } | |
652 | *merged_sid = merger->m_merged_model->add_svalue (merged_sval); | |
653 | } | |
654 | ||
655 | /* Evaluate the condition LHS OP RHS. | |
656 | Subroutine of region_model::eval_condition for when we have a pair of | |
657 | constants. */ | |
658 | ||
659 | tristate | |
660 | constant_svalue::eval_condition (constant_svalue *lhs, | |
661 | enum tree_code op, | |
662 | constant_svalue *rhs) | |
663 | { | |
664 | tree lhs_const = lhs->get_constant (); | |
665 | tree rhs_const = rhs->get_constant (); | |
666 | ||
667 | gcc_assert (CONSTANT_CLASS_P (lhs_const)); | |
668 | gcc_assert (CONSTANT_CLASS_P (rhs_const)); | |
669 | ||
670 | tree comparison | |
671 | = fold_build2 (op, boolean_type_node, lhs_const, rhs_const); | |
672 | if (comparison == boolean_true_node) | |
673 | return tristate (tristate::TS_TRUE); | |
674 | if (comparison == boolean_false_node) | |
675 | return tristate (tristate::TS_FALSE); | |
676 | return tristate::TS_UNKNOWN; | |
677 | } | |
678 | ||
679 | /* Implementation of svalue::print_details vfunc for constant_svalue. */ | |
680 | ||
681 | void | |
682 | constant_svalue::print_details (const region_model &model ATTRIBUTE_UNUSED, | |
683 | svalue_id this_sid ATTRIBUTE_UNUSED, | |
684 | pretty_printer *pp) const | |
685 | { | |
686 | PUSH_IGNORE_WFORMAT | |
687 | pp_printf (pp, "%qE", m_cst_expr); | |
688 | POP_IGNORE_WFORMAT | |
689 | } | |
690 | ||
691 | /* Implementation of svalue::get_child_sid vfunc for constant_svalue. */ | |
692 | ||
693 | svalue_id | |
694 | constant_svalue::get_child_sid (region *parent ATTRIBUTE_UNUSED, | |
695 | region *child, | |
696 | region_model &model, | |
697 | region_model_context *ctxt ATTRIBUTE_UNUSED) | |
698 | { | |
699 | /* TODO: handle the all-zeroes case by returning an all-zeroes of the | |
700 | child type. */ | |
701 | ||
702 | /* Otherwise, we don't have a good way to get a child value out of a | |
703 | constant. | |
704 | ||
705 | Handle this case by using an unknown value. */ | |
706 | svalue *unknown_sval = new unknown_svalue (child->get_type ()); | |
707 | return model.add_svalue (unknown_sval); | |
708 | } | |
709 | ||
710 | /* class unknown_svalue : public svalue. */ | |
711 | ||
712 | /* Compare the fields of this unknown_svalue with OTHER, returning true | |
713 | if they are equal. | |
714 | For use by svalue::operator==. */ | |
715 | ||
716 | bool | |
717 | unknown_svalue::compare_fields (const unknown_svalue &) const | |
718 | { | |
719 | /* I *think* we want to return true here, in that when comparing | |
720 | two region models, we want two peer unknown_svalue instances | |
721 | to be the "same". */ | |
722 | return true; | |
723 | } | |
724 | ||
725 | /* Implementation of svalue::add_to_hash vfunc for unknown_svalue. */ | |
726 | ||
727 | void | |
728 | unknown_svalue::add_to_hash (inchash::hash &) const | |
729 | { | |
730 | /* Empty. */ | |
731 | } | |
732 | ||
733 | /* Implementation of svalue::print_details vfunc for unknown_svalue. */ | |
734 | ||
735 | void | |
736 | unknown_svalue::print_details (const region_model &model ATTRIBUTE_UNUSED, | |
737 | svalue_id this_sid ATTRIBUTE_UNUSED, | |
738 | pretty_printer *pp) const | |
739 | { | |
740 | pp_string (pp, "unknown"); | |
741 | } | |
742 | ||
743 | /* Get a string for KIND for use in debug dumps. */ | |
744 | ||
745 | const char * | |
746 | poison_kind_to_str (enum poison_kind kind) | |
747 | { | |
748 | switch (kind) | |
749 | { | |
750 | default: | |
751 | gcc_unreachable (); | |
752 | case POISON_KIND_UNINIT: | |
753 | return "uninit"; | |
754 | case POISON_KIND_FREED: | |
755 | return "freed"; | |
756 | case POISON_KIND_POPPED_STACK: | |
757 | return "popped stack"; | |
758 | } | |
759 | } | |
760 | ||
761 | /* class poisoned_svalue : public svalue. */ | |
762 | ||
763 | /* Compare the fields of this poisoned_svalue with OTHER, returning true | |
764 | if they are equal. | |
765 | For use by svalue::operator==. */ | |
766 | ||
767 | bool | |
768 | poisoned_svalue::compare_fields (const poisoned_svalue &other) const | |
769 | { | |
770 | return m_kind == other.m_kind; | |
771 | } | |
772 | ||
773 | /* Implementation of svalue::add_to_hash vfunc for poisoned_svalue. */ | |
774 | ||
775 | void | |
776 | poisoned_svalue::add_to_hash (inchash::hash &hstate) const | |
777 | { | |
778 | hstate.add_int (m_kind); | |
779 | } | |
780 | ||
781 | /* Implementation of svalue::print_details vfunc for poisoned_svalue. */ | |
782 | ||
783 | void | |
784 | poisoned_svalue::print_details (const region_model &model ATTRIBUTE_UNUSED, | |
785 | svalue_id this_sid ATTRIBUTE_UNUSED, | |
786 | pretty_printer *pp) const | |
787 | { | |
788 | pp_printf (pp, "poisoned: %s", poison_kind_to_str (m_kind)); | |
789 | } | |
790 | ||
791 | /* class setjmp_svalue's implementation is in engine.cc, so that it can use | |
792 | the declaration of exploded_node. */ | |
793 | ||
794 | /* class region and its various subclasses. */ | |
795 | ||
796 | /* Get a string for KIND for use in debug dumps. */ | |
797 | ||
798 | const char * | |
799 | region_kind_to_str (enum region_kind kind) | |
800 | { | |
801 | switch (kind) | |
802 | { | |
803 | default: | |
804 | gcc_unreachable (); | |
805 | case RK_PRIMITIVE: | |
806 | return "primitive"; | |
807 | case RK_STRUCT: | |
808 | return "struct"; | |
809 | case RK_UNION: | |
810 | return "union"; | |
811 | case RK_ARRAY: | |
812 | return "array"; | |
813 | case RK_FRAME: | |
814 | return "frame"; | |
815 | case RK_GLOBALS: | |
816 | return "globals"; | |
817 | case RK_CODE: | |
818 | return "code"; | |
819 | case RK_FUNCTION: | |
820 | return "function"; | |
821 | case RK_STACK: | |
822 | return "stack"; | |
823 | case RK_HEAP: | |
824 | return "heap"; | |
825 | case RK_ROOT: | |
826 | return "root"; | |
827 | case RK_SYMBOLIC: | |
828 | return "symbolic"; | |
829 | } | |
830 | } | |
831 | ||
832 | /* class region. */ | |
833 | ||
834 | /* Equality operator for region. | |
835 | After comparing base class fields and kind, the rest of the | |
836 | comparison is handled off to a "compare_fields" member function | |
837 | specific to the appropriate subclass. */ | |
838 | ||
839 | bool | |
840 | region::operator== (const region &other) const | |
841 | { | |
842 | if (m_parent_rid != other.m_parent_rid) | |
843 | return false; | |
844 | if (m_sval_id != other.m_sval_id) | |
845 | return false; | |
846 | if (m_type != other.m_type) | |
847 | return false; | |
848 | ||
849 | enum region_kind this_kind = get_kind (); | |
850 | enum region_kind other_kind = other.get_kind (); | |
851 | if (this_kind != other_kind) | |
852 | return false; | |
853 | ||
854 | /* Compare views. */ | |
855 | if (m_view_rids.length () != other.m_view_rids.length ()) | |
856 | return false; | |
857 | int i; | |
858 | region_id *rid; | |
859 | FOR_EACH_VEC_ELT (m_view_rids, i, rid) | |
860 | if (! (*rid == other.m_view_rids[i])) | |
861 | return false; | |
862 | ||
863 | switch (this_kind) | |
864 | { | |
865 | default: | |
866 | gcc_unreachable (); | |
867 | case RK_PRIMITIVE: | |
868 | { | |
869 | #if 1 | |
870 | return true; | |
871 | #else | |
872 | const primitive_region &this_sub | |
873 | = (const primitive_region &)*this; | |
874 | const primitive_region &other_sub | |
875 | = (const primitive_region &)other; | |
876 | return this_sub.compare_fields (other_sub); | |
877 | #endif | |
878 | } | |
879 | case RK_STRUCT: | |
880 | { | |
881 | const struct_region &this_sub | |
882 | = (const struct_region &)*this; | |
883 | const struct_region &other_sub | |
884 | = (const struct_region &)other; | |
885 | return this_sub.compare_fields (other_sub); | |
886 | } | |
887 | case RK_UNION: | |
888 | { | |
889 | const union_region &this_sub | |
890 | = (const union_region &)*this; | |
891 | const union_region &other_sub | |
892 | = (const union_region &)other; | |
893 | return this_sub.compare_fields (other_sub); | |
894 | } | |
895 | case RK_ARRAY: | |
896 | { | |
897 | const array_region &this_sub | |
898 | = (const array_region &)*this; | |
899 | const array_region &other_sub | |
900 | = (const array_region &)other; | |
901 | return this_sub.compare_fields (other_sub); | |
902 | } | |
903 | case RK_FRAME: | |
904 | { | |
905 | const frame_region &this_sub | |
906 | = (const frame_region &)*this; | |
907 | const frame_region &other_sub | |
908 | = (const frame_region &)other; | |
909 | return this_sub.compare_fields (other_sub); | |
910 | } | |
911 | case RK_GLOBALS: | |
912 | { | |
913 | const globals_region &this_sub | |
914 | = (const globals_region &)*this; | |
915 | const globals_region &other_sub | |
916 | = (const globals_region &)other; | |
917 | return this_sub.compare_fields (other_sub); | |
918 | } | |
919 | case RK_CODE: | |
920 | { | |
921 | const code_region &this_sub | |
922 | = (const code_region &)*this; | |
923 | const code_region &other_sub | |
924 | = (const code_region &)other; | |
925 | return this_sub.compare_fields (other_sub); | |
926 | } | |
927 | case RK_FUNCTION: | |
928 | { | |
929 | const function_region &this_sub | |
930 | = (const function_region &)*this; | |
931 | const function_region &other_sub | |
932 | = (const function_region &)other; | |
933 | return this_sub.compare_fields (other_sub); | |
934 | } | |
935 | case RK_STACK: | |
936 | { | |
937 | const stack_region &this_sub | |
938 | = (const stack_region &)*this; | |
939 | const stack_region &other_sub | |
940 | = (const stack_region &)other; | |
941 | return this_sub.compare_fields (other_sub); | |
942 | } | |
943 | case RK_ROOT: | |
944 | { | |
945 | const root_region &this_sub | |
946 | = (const root_region &)*this; | |
947 | const root_region &other_sub | |
948 | = (const root_region &)other; | |
949 | return this_sub.compare_fields (other_sub); | |
950 | } | |
951 | case RK_SYMBOLIC: | |
952 | { | |
953 | const symbolic_region &this_sub | |
954 | = (const symbolic_region &)*this; | |
955 | const symbolic_region &other_sub | |
956 | = (const symbolic_region &)other; | |
957 | return this_sub.compare_fields (other_sub); | |
958 | } | |
959 | case RK_HEAP: | |
960 | { | |
961 | const heap_region &this_sub | |
962 | = (const heap_region &)*this; | |
963 | const heap_region &other_sub | |
964 | = (const heap_region &)other; | |
965 | return this_sub.compare_fields (other_sub); | |
966 | } | |
967 | } | |
968 | } | |
969 | ||
970 | /* Get the parent region of this region. */ | |
971 | ||
972 | region * | |
973 | region::get_parent_region (const region_model &model) const | |
974 | { | |
975 | return model.get_region (m_parent_rid); | |
976 | } | |
977 | ||
978 | /* Set this region's value to RHS_SID (or potentially a variant of it, | |
979 | for some kinds of casts). */ | |
980 | ||
981 | void | |
982 | region::set_value (region_model &model, region_id this_rid, svalue_id rhs_sid, | |
983 | region_model_context *ctxt) | |
984 | { | |
985 | /* Handle some kinds of casting. */ | |
986 | if (m_type) | |
987 | { | |
988 | svalue *sval = model.get_svalue (rhs_sid); | |
989 | if (sval->get_type ()) | |
990 | rhs_sid = model.maybe_cast (m_type, rhs_sid, ctxt); | |
991 | ||
992 | sval = model.get_svalue (rhs_sid); | |
993 | if (sval->get_type ()) | |
994 | gcc_assert (m_type == sval->get_type ()); | |
995 | } | |
996 | ||
997 | m_sval_id = rhs_sid; | |
998 | ||
999 | /* Update views. | |
1000 | If this is a view, it becomes its parent's active view. | |
1001 | If there was already an active views, invalidate its value; otherwise | |
1002 | if the parent itself had a value, invalidate it. | |
1003 | If it's not a view, then deactivate any view that is active on this | |
1004 | region. */ | |
1005 | { | |
1006 | if (m_is_view) | |
1007 | become_active_view (model, this_rid); | |
1008 | else | |
1009 | { | |
1010 | deactivate_any_active_view (model); | |
1011 | gcc_assert (m_active_view_rid.null_p ()); | |
1012 | } | |
1013 | } | |
1014 | } | |
1015 | ||
1016 | /* Make this region (with id THIS_RID) the "active" view of its parent. | |
1017 | Any other active view has its value set to "unknown" and descendent values | |
1018 | cleared. | |
1019 | If there wasn't an active view, then set the parent's value to unknown, and | |
1020 | clear its descendent values (apart from this view). */ | |
1021 | ||
1022 | void | |
1023 | region::become_active_view (region_model &model, region_id this_rid) | |
1024 | { | |
1025 | gcc_assert (m_is_view); | |
1026 | ||
1027 | region *parent_reg = model.get_region (m_parent_rid); | |
1028 | gcc_assert (parent_reg); | |
1029 | ||
1030 | region_id old_active_view_rid = parent_reg->m_active_view_rid; | |
1031 | ||
1032 | if (old_active_view_rid == this_rid) | |
1033 | { | |
1034 | /* Already the active view: do nothing. */ | |
1035 | return; | |
1036 | } | |
1037 | ||
1038 | /* We have a change of active view. */ | |
1039 | parent_reg->m_active_view_rid = this_rid; | |
1040 | ||
1041 | if (old_active_view_rid.null_p ()) | |
1042 | { | |
1043 | /* No previous active view, but the parent and its other children | |
1044 | might have values. | |
1045 | If so, invalidate those values - but not that of the new view. */ | |
1046 | region_id_set below_region (&model); | |
1047 | model.get_descendents (m_parent_rid, &below_region, this_rid); | |
1048 | for (unsigned i = 0; i < model.get_num_regions (); i++) | |
1049 | { | |
1050 | region_id rid (region_id::from_int (i)); | |
1051 | if (below_region.region_p (rid)) | |
1052 | { | |
1053 | region *other_reg = model.get_region (rid); | |
1054 | other_reg->m_sval_id = svalue_id::null (); | |
1055 | } | |
1056 | } | |
1057 | region *parent = model.get_region (m_parent_rid); | |
1058 | parent->m_sval_id | |
1059 | = model.add_svalue (new unknown_svalue (parent->get_type ())); | |
1060 | } | |
1061 | else | |
1062 | { | |
1063 | /* If there was an active view, invalidate it. */ | |
1064 | region *old_active_view = model.get_region (old_active_view_rid); | |
1065 | old_active_view->deactivate_view (model, old_active_view_rid); | |
1066 | } | |
1067 | } | |
1068 | ||
1069 | /* If this region (with id THIS_RID) has an active view, deactivate it, | |
1070 | clearing m_active_view_rid. */ | |
1071 | ||
1072 | void | |
1073 | region::deactivate_any_active_view (region_model &model) | |
1074 | { | |
1075 | if (m_active_view_rid.null_p ()) | |
1076 | return; | |
1077 | region *view = model.get_region (m_active_view_rid); | |
1078 | view->deactivate_view (model, m_active_view_rid); | |
1079 | m_active_view_rid = region_id::null (); | |
1080 | } | |
1081 | ||
1082 | /* Clear any values for regions below THIS_RID. | |
1083 | Set the view's value to unknown. */ | |
1084 | ||
1085 | void | |
1086 | region::deactivate_view (region_model &model, region_id this_view_rid) | |
1087 | { | |
1088 | gcc_assert (is_view_p ()); | |
1089 | ||
1090 | /* Purge values from old_active_this_view_rid and all its | |
1091 | descendents. Potentially we could use a poison value | |
1092 | for this, but let's use unknown for now. */ | |
1093 | region_id_set below_view (&model); | |
1094 | model.get_descendents (this_view_rid, &below_view, region_id::null ()); | |
1095 | ||
1096 | for (unsigned i = 0; i < model.get_num_regions (); i++) | |
1097 | { | |
1098 | region_id rid (region_id::from_int (i)); | |
1099 | if (below_view.region_p (rid)) | |
1100 | { | |
1101 | region *other_reg = model.get_region (rid); | |
1102 | other_reg->m_sval_id = svalue_id::null (); | |
1103 | } | |
1104 | } | |
1105 | ||
1106 | m_sval_id = model.add_svalue (new unknown_svalue (get_type ())); | |
1107 | } | |
1108 | ||
1109 | /* Get a value for this region, either its value if it has one, | |
1110 | or, failing that, "inherit" a value from first ancestor with a | |
1111 | non-null value. | |
1112 | ||
1113 | For example, when getting the value for a local variable within | |
1114 | a stack frame that doesn't have one, the frame doesn't have a value | |
1115 | either, but the stack as a whole will have an "uninitialized" poison | |
1116 | value, so inherit that. */ | |
1117 | ||
1118 | svalue_id | |
1119 | region::get_value (region_model &model, bool non_null, | |
1120 | region_model_context *ctxt) | |
1121 | { | |
1122 | /* If this region has a value, use it. */ | |
1123 | if (!m_sval_id.null_p ()) | |
1124 | return m_sval_id; | |
1125 | ||
1126 | /* Otherwise, "inherit" value from first ancestor with a | |
1127 | non-null value. */ | |
1128 | ||
1129 | region *parent = model.get_region (m_parent_rid); | |
1130 | if (parent) | |
1131 | { | |
1132 | svalue_id inherited_sid | |
1133 | = parent->get_inherited_child_sid (this, model, ctxt); | |
1134 | if (!inherited_sid.null_p ()) | |
1135 | return inherited_sid; | |
1136 | } | |
1137 | ||
1138 | /* If a non-null value has been requested, then generate | |
1139 | a new unknown value. Store it, so that repeated reads from this | |
1140 | region will yield the same unknown value. */ | |
1141 | if (non_null) | |
1142 | { | |
1143 | svalue_id unknown_sid = model.add_svalue (new unknown_svalue (m_type)); | |
1144 | m_sval_id = unknown_sid; | |
1145 | return unknown_sid; | |
1146 | } | |
1147 | ||
1148 | return svalue_id::null (); | |
1149 | } | |
1150 | ||
1151 | /* Get a value for CHILD, inheriting from this region. | |
1152 | ||
1153 | Recurse, so this region will inherit a value if it doesn't already | |
1154 | have one. */ | |
1155 | ||
1156 | svalue_id | |
1157 | region::get_inherited_child_sid (region *child, | |
1158 | region_model &model, | |
1159 | region_model_context *ctxt) | |
1160 | { | |
1161 | if (m_sval_id.null_p ()) | |
1162 | { | |
1163 | /* Recurse. */ | |
1164 | if (!m_parent_rid.null_p ()) | |
1165 | { | |
1166 | region *parent = model.get_region (m_parent_rid); | |
1167 | m_sval_id = parent->get_inherited_child_sid (this, model, ctxt); | |
1168 | } | |
1169 | } | |
1170 | ||
1171 | if (!m_sval_id.null_p ()) | |
1172 | { | |
1173 | /* Clone the parent's value, so that attempts to update it | |
1174 | (e.g giving a specific value to an inherited "uninitialized" | |
1175 | value) touch the child, and not the parent. */ | |
1176 | svalue *this_value = model.get_svalue (m_sval_id); | |
1177 | svalue_id new_child_sid | |
1178 | = this_value->get_child_sid (this, child, model, ctxt); | |
1179 | if (ctxt) | |
1180 | ctxt->on_inherited_svalue (m_sval_id, new_child_sid); | |
1181 | child->m_sval_id = new_child_sid; | |
1182 | return new_child_sid; | |
1183 | } | |
1184 | ||
1185 | return svalue_id::null (); | |
1186 | } | |
1187 | ||
1188 | /* Generate a hash value for this region. The work is done by the | |
1189 | add_to_hash vfunc. */ | |
1190 | ||
1191 | hashval_t | |
1192 | region::hash () const | |
1193 | { | |
1194 | inchash::hash hstate; | |
1195 | add_to_hash (hstate); | |
1196 | return hstate.end (); | |
1197 | } | |
1198 | ||
1199 | /* Print a one-liner representation of this region to PP, assuming | |
1200 | that this region is within MODEL and its id is THIS_RID. */ | |
1201 | ||
1202 | void | |
1203 | region::print (const region_model &model, | |
1204 | region_id this_rid, | |
1205 | pretty_printer *pp) const | |
1206 | { | |
1207 | this_rid.print (pp); | |
1208 | pp_string (pp, ": {"); | |
1209 | ||
1210 | /* vfunc. */ | |
1211 | print_fields (model, this_rid, pp); | |
1212 | ||
1213 | pp_string (pp, "}"); | |
1214 | } | |
1215 | ||
1216 | /* Base class implementation of region::dump_dot_to_pp vfunc. */ | |
1217 | ||
1218 | void | |
1219 | region::dump_dot_to_pp (const region_model &model, | |
1220 | region_id this_rid, | |
1221 | pretty_printer *pp) const | |
1222 | { | |
1223 | this_rid.dump_node_name_to_pp (pp); | |
1224 | pp_printf (pp, " [shape=none,margin=0,style=filled,fillcolor=%s,label=\"", | |
1225 | "lightgrey"); | |
1226 | pp_write_text_to_stream (pp); | |
1227 | print (model, this_rid, pp); | |
1228 | pp_write_text_as_dot_label_to_stream (pp, /*for_record=*/false); | |
1229 | pp_string (pp, "\"];"); | |
1230 | pp_newline (pp); | |
1231 | ||
1232 | /* Add edge to svalue. */ | |
1233 | if (!m_sval_id.null_p ()) | |
1234 | { | |
1235 | this_rid.dump_node_name_to_pp (pp); | |
1236 | pp_string (pp, " -> "); | |
1237 | m_sval_id.dump_node_name_to_pp (pp); | |
1238 | pp_string (pp, ";"); | |
1239 | pp_newline (pp); | |
1240 | } | |
1241 | ||
1242 | /* Add edge to parent. */ | |
1243 | if (!m_parent_rid.null_p ()) | |
1244 | { | |
1245 | this_rid.dump_node_name_to_pp (pp); | |
1246 | pp_string (pp, " -> "); | |
1247 | m_parent_rid.dump_node_name_to_pp (pp); | |
1248 | pp_string (pp, ";"); | |
1249 | pp_newline (pp); | |
1250 | } | |
1251 | } | |
1252 | ||
1253 | /* Dump a tree-like ASCII-art representation of this region to PP. */ | |
1254 | ||
1255 | void | |
1256 | region::dump_to_pp (const region_model &model, | |
1257 | region_id this_rid, | |
1258 | pretty_printer *pp, | |
1259 | const char *prefix, | |
1260 | bool is_last_child) const | |
1261 | { | |
1262 | print (model, this_rid, pp); | |
1263 | pp_newline (pp); | |
1264 | ||
1265 | const char *new_prefix; | |
1266 | if (!m_parent_rid.null_p ()) | |
1267 | new_prefix = ACONCAT ((prefix, is_last_child ? " " : "| ", NULL)); | |
1268 | else | |
1269 | new_prefix = prefix; | |
1270 | ||
1271 | const char *begin_color = colorize_start (pp_show_color (pp), "note"); | |
1272 | const char *end_color = colorize_stop (pp_show_color (pp)); | |
1273 | char *field_prefix | |
1274 | = ACONCAT ((begin_color, new_prefix, "|:", end_color, NULL)); | |
1275 | ||
1276 | if (!m_sval_id.null_p ()) | |
1277 | { | |
1278 | pp_printf (pp, "%s sval: ", field_prefix); | |
1279 | model.get_svalue (m_sval_id)->print (model, m_sval_id, pp); | |
1280 | pp_newline (pp); | |
1281 | } | |
1282 | if (m_type) | |
1283 | { | |
1284 | PUSH_IGNORE_WFORMAT | |
1285 | pp_printf (pp, "%s type: %qT", field_prefix, m_type); | |
1286 | POP_IGNORE_WFORMAT | |
1287 | pp_newline (pp); | |
1288 | } | |
1289 | ||
1290 | /* Find the children. */ | |
1291 | ||
1292 | auto_vec<region_id> child_rids; | |
1293 | unsigned i; | |
1294 | for (unsigned i = 0; i < model.get_num_regions (); ++i) | |
1295 | { | |
1296 | region_id rid = region_id::from_int (i); | |
1297 | region *child = model.get_region (rid); | |
1298 | if (child->m_parent_rid == this_rid) | |
1299 | child_rids.safe_push (rid); | |
1300 | } | |
1301 | ||
1302 | /* Print the children, using dump_child_label to label them. */ | |
1303 | ||
1304 | region_id *child_rid; | |
1305 | FOR_EACH_VEC_ELT (child_rids, i, child_rid) | |
1306 | { | |
1307 | is_last_child = (i == child_rids.length () - 1); | |
1308 | if (!this_rid.null_p ()) | |
1309 | { | |
1310 | const char *tail = is_last_child ? "`-" : "|-"; | |
1311 | pp_printf (pp, "%r%s%s%R", "note", new_prefix, tail); | |
1312 | } | |
1313 | dump_child_label (model, this_rid, *child_rid, pp); | |
1314 | model.get_region (*child_rid)->dump_to_pp (model, *child_rid, pp, | |
1315 | new_prefix, | |
1316 | is_last_child); | |
1317 | } | |
1318 | } | |
1319 | ||
1320 | /* Base implementation of region::dump_child_label vfunc. */ | |
1321 | ||
1322 | void | |
1323 | region::dump_child_label (const region_model &model, | |
1324 | region_id this_rid ATTRIBUTE_UNUSED, | |
1325 | region_id child_rid, | |
1326 | pretty_printer *pp) const | |
1327 | { | |
1328 | region *child = model.get_region (child_rid); | |
1329 | if (child->m_is_view) | |
1330 | { | |
1331 | gcc_assert (TYPE_P (child->get_type ())); | |
1332 | if (m_active_view_rid == child_rid) | |
1333 | pp_string (pp, "active "); | |
1334 | else | |
1335 | pp_string (pp, "inactive "); | |
1336 | PUSH_IGNORE_WFORMAT | |
1337 | pp_printf (pp, "view as %qT: ", child->get_type ()); | |
1338 | POP_IGNORE_WFORMAT | |
1339 | } | |
1340 | } | |
1341 | ||
1342 | /* Assert that this object is valid. */ | |
1343 | ||
1344 | void | |
1345 | region::validate (const region_model *model) const | |
1346 | { | |
1347 | m_parent_rid.validate (*model); | |
1348 | m_sval_id.validate (*model); | |
1349 | unsigned i; | |
1350 | region_id *view_rid; | |
1351 | FOR_EACH_VEC_ELT (m_view_rids, i, view_rid) | |
1352 | { | |
1353 | gcc_assert (!view_rid->null_p ()); | |
1354 | view_rid->validate (*model); | |
1355 | } | |
1356 | m_active_view_rid.validate (*model); | |
1357 | } | |
1358 | ||
1359 | /* Apply MAP to svalue_ids to this region. This updates the value | |
1360 | for the region (if any). */ | |
1361 | ||
1362 | void | |
1363 | region::remap_svalue_ids (const svalue_id_map &map) | |
1364 | { | |
1365 | map.update (&m_sval_id); | |
1366 | } | |
1367 | ||
1368 | /* Base implementation of region::remap_region_ids vfunc; subclasses should | |
1369 | chain up to this, updating any region_id data. */ | |
1370 | ||
1371 | void | |
1372 | region::remap_region_ids (const region_id_map &map) | |
1373 | { | |
1374 | map.update (&m_parent_rid); | |
1375 | unsigned i; | |
1376 | region_id *view_rid; | |
1377 | FOR_EACH_VEC_ELT (m_view_rids, i, view_rid) | |
1378 | map.update (view_rid); | |
1379 | map.update (&m_active_view_rid); | |
1380 | } | |
1381 | ||
1382 | /* Add a new region with id VIEW_RID as a view of this region. */ | |
1383 | ||
1384 | void | |
1385 | region::add_view (region_id view_rid, region_model *model) | |
1386 | { | |
1387 | gcc_assert (!view_rid.null_p ()); | |
1388 | region *new_view = model->get_region (view_rid); | |
1389 | new_view->m_is_view = true; | |
1390 | gcc_assert (!new_view->m_parent_rid.null_p ()); | |
1391 | gcc_assert (new_view->m_sval_id.null_p ()); | |
1392 | ||
1393 | //gcc_assert (new_view->get_type () != NULL_TREE); | |
1394 | // TODO: this can sometimes be NULL, when viewing through a (void *) | |
1395 | ||
1396 | // TODO: the type ought to not be present yet | |
1397 | ||
1398 | m_view_rids.safe_push (view_rid); | |
1399 | } | |
1400 | ||
1401 | /* Look for a view of type TYPE of this region, returning its id if found, | |
1402 | or null otherwise. */ | |
1403 | ||
1404 | region_id | |
1405 | region::get_view (tree type, region_model *model) const | |
1406 | { | |
1407 | unsigned i; | |
1408 | region_id *view_rid; | |
1409 | FOR_EACH_VEC_ELT (m_view_rids, i, view_rid) | |
1410 | { | |
1411 | region *view = model->get_region (*view_rid); | |
1412 | gcc_assert (view->m_is_view); | |
1413 | if (view->get_type () == type) | |
1414 | return *view_rid; | |
1415 | } | |
1416 | return region_id::null (); | |
1417 | } | |
1418 | ||
1419 | /* region's ctor. */ | |
1420 | ||
1421 | region::region (region_id parent_rid, svalue_id sval_id, tree type) | |
1422 | : m_parent_rid (parent_rid), m_sval_id (sval_id), m_type (type), | |
1423 | m_view_rids (), m_is_view (false), m_active_view_rid (region_id::null ()) | |
1424 | { | |
1425 | gcc_assert (type == NULL_TREE || TYPE_P (type)); | |
1426 | } | |
1427 | ||
1428 | /* region's copy ctor. */ | |
1429 | ||
1430 | region::region (const region &other) | |
1431 | : m_parent_rid (other.m_parent_rid), m_sval_id (other.m_sval_id), | |
1432 | m_type (other.m_type), m_view_rids (other.m_view_rids.length ()), | |
1433 | m_is_view (other.m_is_view), m_active_view_rid (other.m_active_view_rid) | |
1434 | { | |
1435 | int i; | |
1436 | region_id *rid; | |
1437 | FOR_EACH_VEC_ELT (other.m_view_rids, i, rid) | |
1438 | m_view_rids.quick_push (*rid); | |
1439 | } | |
1440 | ||
1441 | /* Base implementation of region::add_to_hash vfunc; subclasses should | |
1442 | chain up to this. */ | |
1443 | ||
1444 | void | |
1445 | region::add_to_hash (inchash::hash &hstate) const | |
1446 | { | |
1447 | inchash::add (m_parent_rid, hstate); | |
1448 | inchash::add (m_sval_id, hstate); | |
1449 | hstate.add_ptr (m_type); | |
1450 | // TODO: views | |
1451 | } | |
1452 | ||
1453 | /* Base implementation of region::print_fields vfunc. */ | |
1454 | ||
1455 | void | |
1456 | region::print_fields (const region_model &model ATTRIBUTE_UNUSED, | |
1457 | region_id this_rid ATTRIBUTE_UNUSED, | |
1458 | pretty_printer *pp) const | |
1459 | { | |
1460 | pp_printf (pp, "kind: %qs", region_kind_to_str (get_kind ())); | |
1461 | ||
1462 | pp_string (pp, ", parent: "); | |
1463 | m_parent_rid.print (pp); | |
1464 | ||
1465 | pp_printf (pp, ", sval: "); | |
1466 | m_sval_id.print (pp); | |
1467 | ||
1468 | PUSH_IGNORE_WFORMAT | |
1469 | if (m_type) | |
1470 | pp_printf (pp, ", type: %qT", m_type); | |
1471 | POP_IGNORE_WFORMAT | |
1472 | } | |
1473 | ||
1474 | /* Determine if a pointer to this region must be non-NULL. | |
1475 | ||
1476 | Generally, pointers to regions must be non-NULL, but pointers | |
1477 | to symbolic_regions might, in fact, be NULL. | |
1478 | ||
1479 | This allows us to simulate functions like malloc and calloc with: | |
1480 | - only one "outcome" from each statement, | |
1481 | - the idea that the pointer is on the heap if non-NULL | |
1482 | - the possibility that the pointer could be NULL | |
1483 | - the idea that successive values returned from malloc are non-equal | |
1484 | - to be able to zero-fill for calloc. */ | |
1485 | ||
1486 | bool | |
1487 | region::non_null_p (const region_model &model) const | |
1488 | { | |
1489 | /* Look through views to get at the underlying region. */ | |
1490 | if (is_view_p ()) | |
1491 | return model.get_region (m_parent_rid)->non_null_p (model); | |
1492 | ||
1493 | /* Are we within a symbolic_region? If so, it could be NULL. */ | |
1494 | if (const symbolic_region *sym_reg = dyn_cast_symbolic_region ()) | |
1495 | { | |
1496 | if (sym_reg->m_possibly_null) | |
1497 | return false; | |
1498 | } | |
1499 | ||
1500 | return true; | |
1501 | } | |
1502 | ||
1503 | /* class primitive_region : public region. */ | |
1504 | ||
1505 | /* Implementation of region::clone vfunc for primitive_region. */ | |
1506 | ||
1507 | region * | |
1508 | primitive_region::clone () const | |
1509 | { | |
1510 | return new primitive_region (*this); | |
1511 | } | |
1512 | ||
1513 | /* Implementation of region::walk_for_canonicalization vfunc for | |
1514 | primitive_region. */ | |
1515 | ||
1516 | void | |
1517 | primitive_region::walk_for_canonicalization (canonicalization *) const | |
1518 | { | |
1519 | /* Empty. */ | |
1520 | } | |
1521 | ||
1522 | /* class map_region : public region. */ | |
1523 | ||
1524 | /* map_region's copy ctor. */ | |
1525 | ||
1526 | map_region::map_region (const map_region &other) | |
1527 | : region (other), | |
1528 | m_map (other.m_map) | |
1529 | { | |
1530 | } | |
1531 | ||
1532 | /* Compare the fields of this map_region with OTHER, returning true | |
1533 | if they are equal. | |
1534 | For use by region::operator==. */ | |
1535 | ||
1536 | bool | |
1537 | map_region::compare_fields (const map_region &other) const | |
1538 | { | |
1539 | if (m_map.elements () != other.m_map.elements ()) | |
1540 | return false; | |
1541 | ||
1542 | for (map_t::iterator iter = m_map.begin (); | |
1543 | iter != m_map.end (); | |
1544 | ++iter) | |
1545 | { | |
1546 | tree key = (*iter).first; | |
1547 | region_id e = (*iter).second; | |
1548 | region_id *other_slot = const_cast <map_t &> (other.m_map).get (key); | |
1549 | if (other_slot == NULL) | |
1550 | return false; | |
1551 | if (e != *other_slot) | |
1552 | return false; | |
1553 | } | |
1554 | return true; | |
1555 | } | |
1556 | ||
1557 | /* Implementation of region::print_fields vfunc for map_region. */ | |
1558 | ||
1559 | void | |
1560 | map_region::print_fields (const region_model &model, | |
1561 | region_id this_rid, | |
1562 | pretty_printer *pp) const | |
1563 | { | |
1564 | region::print_fields (model, this_rid, pp); | |
1565 | pp_string (pp, ", map: {"); | |
1566 | for (map_t::iterator iter = m_map.begin (); | |
1567 | iter != m_map.end (); | |
1568 | ++iter) | |
1569 | { | |
1570 | if (iter != m_map.begin ()) | |
1571 | pp_string (pp, ", "); | |
1572 | tree expr = (*iter).first; | |
1573 | region_id child_rid = (*iter).second; | |
1574 | PUSH_IGNORE_WFORMAT | |
1575 | pp_printf (pp, "%qE: ", expr); | |
1576 | POP_IGNORE_WFORMAT | |
1577 | child_rid.print (pp); | |
1578 | } | |
1579 | pp_string (pp, "}"); | |
1580 | } | |
1581 | ||
1582 | /* Implementation of region::dump_dot_to_pp vfunc for map_region. */ | |
1583 | ||
1584 | void | |
1585 | map_region::dump_dot_to_pp (const region_model &model, | |
1586 | region_id this_rid, | |
1587 | pretty_printer *pp) const | |
1588 | { | |
1589 | region::dump_dot_to_pp (model, this_rid, pp); | |
1590 | for (map_t::iterator iter = m_map.begin (); | |
1591 | iter != m_map.end (); | |
1592 | ++iter) | |
1593 | { | |
1594 | // TODO: add nodes/edges to label things | |
1595 | ||
1596 | tree expr = (*iter).first; | |
1597 | region_id child_rid = (*iter).second; | |
1598 | ||
1599 | pp_printf (pp, "rid_label_%i [label=\"", child_rid.as_int ()); | |
1600 | pp_write_text_to_stream (pp); | |
1601 | PUSH_IGNORE_WFORMAT | |
1602 | pp_printf (pp, "%qE", expr); | |
1603 | POP_IGNORE_WFORMAT | |
1604 | pp_write_text_as_dot_label_to_stream (pp, /*for_record=*/false); | |
1605 | pp_string (pp, "\"];"); | |
1606 | pp_newline (pp); | |
1607 | ||
1608 | pp_printf (pp, "rid_label_%i", child_rid.as_int ()); | |
1609 | pp_string (pp, " -> "); | |
1610 | child_rid.dump_node_name_to_pp (pp); | |
1611 | pp_string (pp, ";"); | |
1612 | pp_newline (pp); | |
1613 | } | |
1614 | } | |
1615 | ||
1616 | /* Implementation of region::dump_child_label vfunc for map_region. */ | |
1617 | ||
1618 | void | |
1619 | map_region::dump_child_label (const region_model &model, | |
1620 | region_id this_rid, | |
1621 | region_id child_rid, | |
1622 | pretty_printer *pp) const | |
1623 | { | |
1624 | region::dump_child_label (model, this_rid, child_rid, pp); | |
1625 | ||
1626 | for (map_t::iterator iter = m_map.begin (); | |
1627 | iter != m_map.end (); | |
1628 | ++iter) | |
1629 | { | |
1630 | if (child_rid == (*iter).second) | |
1631 | { | |
1632 | tree key = (*iter).first; | |
1633 | PUSH_IGNORE_WFORMAT | |
1634 | if (DECL_P (key)) | |
1635 | pp_printf (pp, "%qD: ", key); | |
1636 | else | |
1637 | pp_printf (pp, "%qE: ", key); | |
1638 | POP_IGNORE_WFORMAT | |
1639 | } | |
1640 | } | |
1641 | } | |
1642 | ||
1643 | /* Look for a child region for KEY within this map_region. | |
1644 | If it doesn't already exist, create a child map_region, using TYPE for | |
1645 | its type. | |
1646 | Return the region_id of the child (whether pre-existing, or | |
1647 | newly-created). */ | |
1648 | ||
1649 | region_id | |
1650 | map_region::get_or_create (region_model *model, | |
1651 | region_id this_rid, | |
1652 | tree key, | |
1653 | tree type) | |
1654 | { | |
1655 | gcc_assert (key); | |
1656 | gcc_assert (valid_key_p (key)); | |
1657 | region_id *slot = m_map.get (key); | |
1658 | if (slot) | |
1659 | return *slot; | |
1660 | region_id child_rid = model->add_region_for_type (this_rid, type); | |
1661 | m_map.put (key, child_rid); | |
1662 | return child_rid; | |
1663 | } | |
1664 | ||
1665 | /* Get the region_id for the child region for KEY within this | |
1666 | MAP_REGION, or NULL if there is no such child region. */ | |
1667 | ||
1668 | region_id * | |
1669 | map_region::get (tree key) | |
1670 | { | |
1671 | gcc_assert (key); | |
1672 | gcc_assert (valid_key_p (key)); | |
1673 | region_id *slot = m_map.get (key); | |
1674 | return slot; | |
1675 | } | |
1676 | ||
1677 | /* Implementation of region::add_to_hash vfunc for map_region. */ | |
1678 | ||
1679 | void | |
1680 | map_region::add_to_hash (inchash::hash &hstate) const | |
1681 | { | |
1682 | region::add_to_hash (hstate); | |
1683 | // TODO | |
1684 | } | |
1685 | ||
1686 | /* Implementation of region::remap_region_ids vfunc for map_region. */ | |
1687 | ||
1688 | void | |
1689 | map_region::remap_region_ids (const region_id_map &map) | |
1690 | { | |
1691 | region::remap_region_ids (map); | |
1692 | ||
1693 | /* Remap the region ids within the map entries. */ | |
1694 | for (map_t::iterator iter = m_map.begin (); | |
1695 | iter != m_map.end (); ++iter) | |
1696 | map.update (&(*iter).second); | |
1697 | } | |
1698 | ||
1699 | /* Remove the binding of KEY to its child region (but not the | |
1700 | child region itself). | |
1701 | For use when purging unneeded SSA names. */ | |
1702 | ||
1703 | void | |
1704 | map_region::unbind (tree key) | |
1705 | { | |
1706 | gcc_assert (key); | |
1707 | gcc_assert (valid_key_p (key)); | |
1708 | m_map.remove (key); | |
1709 | } | |
1710 | ||
1711 | /* Look for a child region with id CHILD_RID within this map_region. | |
1712 | If one is found, return its tree key, otherwise return NULL_TREE. */ | |
1713 | ||
1714 | tree | |
1715 | map_region::get_tree_for_child_region (region_id child_rid) const | |
1716 | { | |
1717 | // TODO: do we want to store an inverse map? | |
1718 | for (map_t::iterator iter = m_map.begin (); | |
1719 | iter != m_map.end (); | |
1720 | ++iter) | |
1721 | { | |
1722 | tree key = (*iter).first; | |
1723 | region_id r = (*iter).second; | |
1724 | if (r == child_rid) | |
1725 | return key; | |
1726 | } | |
1727 | ||
1728 | return NULL_TREE; | |
1729 | } | |
1730 | ||
1731 | /* Look for a child region CHILD within this map_region. | |
1732 | If one is found, return its tree key, otherwise return NULL_TREE. */ | |
1733 | ||
1734 | tree | |
1735 | map_region::get_tree_for_child_region (region *child, | |
1736 | const region_model &model) const | |
1737 | { | |
1738 | // TODO: do we want to store an inverse map? | |
1739 | for (map_t::iterator iter = m_map.begin (); | |
1740 | iter != m_map.end (); | |
1741 | ++iter) | |
1742 | { | |
1743 | tree key = (*iter).first; | |
1744 | region_id r = (*iter).second; | |
1745 | if (model.get_region (r) == child) | |
1746 | return key; | |
1747 | } | |
1748 | ||
1749 | return NULL_TREE; | |
1750 | } | |
1751 | ||
1752 | /* Comparator for trees to impose a deterministic ordering on | |
1753 | T1 and T2. */ | |
1754 | ||
1755 | static int | |
1756 | tree_cmp (const_tree t1, const_tree t2) | |
1757 | { | |
1758 | gcc_assert (t1); | |
1759 | gcc_assert (t2); | |
1760 | ||
1761 | /* Test tree codes first. */ | |
1762 | if (TREE_CODE (t1) != TREE_CODE (t2)) | |
1763 | return TREE_CODE (t1) - TREE_CODE (t2); | |
1764 | ||
1765 | /* From this point on, we know T1 and T2 have the same tree code. */ | |
1766 | ||
1767 | if (DECL_P (t1)) | |
1768 | { | |
1769 | if (DECL_NAME (t1) && DECL_NAME (t2)) | |
1770 | return strcmp (IDENTIFIER_POINTER (DECL_NAME (t1)), | |
1771 | IDENTIFIER_POINTER (DECL_NAME (t2))); | |
1772 | else | |
1773 | { | |
1774 | if (DECL_NAME (t1)) | |
1775 | return -1; | |
1776 | else if (DECL_NAME (t2)) | |
1777 | return 1; | |
1778 | else | |
1779 | return DECL_UID (t1) - DECL_UID (t2); | |
1780 | } | |
1781 | } | |
1782 | ||
1783 | switch (TREE_CODE (t1)) | |
1784 | { | |
1785 | case SSA_NAME: | |
1786 | { | |
1787 | if (SSA_NAME_VAR (t1) && SSA_NAME_VAR (t2)) | |
1788 | { | |
1789 | int var_cmp = tree_cmp (SSA_NAME_VAR (t1), SSA_NAME_VAR (t2)); | |
1790 | if (var_cmp) | |
1791 | return var_cmp; | |
1792 | return SSA_NAME_VERSION (t1) - SSA_NAME_VERSION (t2); | |
1793 | } | |
1794 | else | |
1795 | { | |
1796 | if (SSA_NAME_VAR (t1)) | |
1797 | return -1; | |
1798 | else if (SSA_NAME_VAR (t2)) | |
1799 | return 1; | |
1800 | else | |
1801 | return SSA_NAME_VERSION (t1) - SSA_NAME_VERSION (t2); | |
1802 | } | |
1803 | } | |
1804 | break; | |
1805 | ||
1806 | case INTEGER_CST: | |
1807 | return tree_int_cst_compare (t1, t2); | |
1808 | ||
1809 | case REAL_CST: | |
1810 | { | |
1811 | real_value *rv1 = TREE_REAL_CST_PTR (t1); | |
1812 | real_value *rv2 = TREE_REAL_CST_PTR (t2); | |
1813 | if (real_compare (LT_EXPR, rv1, rv2)) | |
1814 | return -1; | |
1815 | if (real_compare (LT_EXPR, rv2, rv1)) | |
1816 | return 1; | |
1817 | return 0; | |
1818 | } | |
1819 | ||
1820 | case STRING_CST: | |
1821 | return strcmp (TREE_STRING_POINTER (t1), | |
1822 | TREE_STRING_POINTER (t2)); | |
1823 | ||
1824 | default: | |
1825 | gcc_unreachable (); | |
1826 | break; | |
1827 | } | |
1828 | ||
1829 | gcc_unreachable (); | |
1830 | ||
1831 | return 0; | |
1832 | } | |
1833 | ||
1834 | /* qsort comparator for trees to impose a deterministic ordering on | |
1835 | P1 and P2. */ | |
1836 | ||
1837 | static int | |
1838 | tree_cmp (const void *p1, const void *p2) | |
1839 | { | |
1840 | const_tree t1 = *(const_tree const *)p1; | |
1841 | const_tree t2 = *(const_tree const *)p2; | |
1842 | ||
1843 | int result = tree_cmp (t1, t2); | |
1844 | ||
1845 | /* Check that the ordering is symmetric */ | |
1846 | #if CHECKING_P | |
1847 | int reversed = tree_cmp (t2, t1); | |
1848 | gcc_assert (reversed == -result); | |
1849 | #endif | |
1850 | ||
1851 | /* We should only have 0 for equal pairs. */ | |
1852 | #if 0 | |
1853 | gcc_assert (result != 0 | |
1854 | || t1 == t2); | |
1855 | #endif | |
1856 | ||
1857 | return result; | |
1858 | } | |
1859 | ||
1860 | /* Attempt to merge MAP_REGION_A and MAP_REGION_B into MERGED_MAP_REGION, | |
1861 | which has region_id MERGED_RID, using MERGER. | |
1862 | Return true if the merger is possible, false otherwise. */ | |
1863 | ||
1864 | bool | |
1865 | map_region::can_merge_p (const map_region *map_region_a, | |
1866 | const map_region *map_region_b, | |
1867 | map_region *merged_map_region, | |
1868 | region_id merged_rid, | |
1869 | model_merger *merger) | |
1870 | { | |
1871 | for (map_t::iterator iter = map_region_a->m_map.begin (); | |
1872 | iter != map_region_a->m_map.end (); | |
1873 | ++iter) | |
1874 | { | |
1875 | tree key_a = (*iter).first; | |
1876 | region_id rid_a = (*iter).second; | |
1877 | ||
1878 | if (const region_id *slot_b | |
1879 | = const_cast<map_region *>(map_region_b)->m_map.get (key_a)) | |
1880 | { | |
1881 | region_id rid_b = *slot_b; | |
1882 | ||
1883 | region *child_region_a = merger->get_region_a <region> (rid_a); | |
1884 | region *child_region_b = merger->get_region_b <region> (rid_b); | |
1885 | ||
1886 | gcc_assert (child_region_a->get_type () | |
1887 | == child_region_b->get_type ()); | |
1888 | ||
1889 | gcc_assert (child_region_a->get_kind () | |
1890 | == child_region_b->get_kind ()); | |
1891 | ||
1892 | region_id child_merged_rid | |
1893 | = merged_map_region->get_or_create (merger->m_merged_model, | |
1894 | merged_rid, | |
1895 | key_a, | |
1896 | child_region_a->get_type ()); | |
1897 | ||
1898 | region *child_merged_region | |
1899 | = merger->m_merged_model->get_region (child_merged_rid); | |
1900 | ||
1901 | /* Consider values. */ | |
1902 | svalue_id child_a_sid = child_region_a->get_value_direct (); | |
1903 | svalue_id child_b_sid = child_region_b->get_value_direct (); | |
1904 | svalue_id child_merged_sid; | |
1905 | if (!merger->can_merge_values_p (child_a_sid, child_b_sid, | |
1906 | &child_merged_sid)) | |
1907 | return false; | |
1908 | if (!child_merged_sid.null_p ()) | |
1909 | child_merged_region->set_value (*merger->m_merged_model, | |
1910 | child_merged_rid, | |
1911 | child_merged_sid, | |
1912 | NULL); | |
1913 | ||
1914 | if (map_region *map_region_a = child_region_a->dyn_cast_map_region ()) | |
1915 | { | |
1916 | /* Recurse. */ | |
1917 | if (!can_merge_p (map_region_a, | |
1918 | as_a <map_region *> (child_region_b), | |
1919 | as_a <map_region *> (child_merged_region), | |
1920 | child_merged_rid, | |
1921 | merger)) | |
1922 | return false; | |
1923 | } | |
1924 | ||
1925 | } | |
1926 | else | |
1927 | { | |
1928 | /* TODO: region is present in A, but absent in B. */ | |
1929 | } | |
1930 | } | |
1931 | ||
1932 | /* TODO: check for keys in B that aren't in A. */ | |
1933 | ||
1934 | return true; | |
1935 | } | |
1936 | ||
1937 | ||
1938 | /* Implementation of region::walk_for_canonicalization vfunc for | |
1939 | map_region. */ | |
1940 | ||
1941 | void | |
1942 | map_region::walk_for_canonicalization (canonicalization *c) const | |
1943 | { | |
1944 | auto_vec<tree> keys (m_map.elements ()); | |
1945 | for (map_t::iterator iter = m_map.begin (); | |
1946 | iter != m_map.end (); | |
1947 | ++iter) | |
1948 | { | |
1949 | tree key_a = (*iter).first; | |
1950 | keys.quick_push (key_a); | |
1951 | } | |
1952 | keys.qsort (tree_cmp); | |
1953 | ||
1954 | unsigned i; | |
1955 | tree key; | |
1956 | FOR_EACH_VEC_ELT (keys, i, key) | |
1957 | { | |
1958 | region_id rid = *const_cast<map_region *>(this)->m_map.get (key); | |
1959 | c->walk_rid (rid); | |
1960 | } | |
1961 | } | |
1962 | ||
1963 | /* For debugging purposes: look for a child region for a decl named | |
1964 | IDENTIFIER (or an SSA_NAME for such a decl), returning its value, | |
1965 | or svalue_id::null if none are found. */ | |
1966 | ||
1967 | svalue_id | |
1968 | map_region::get_value_by_name (tree identifier, | |
1969 | const region_model &model) const | |
1970 | { | |
1971 | for (map_t::iterator iter = m_map.begin (); | |
1972 | iter != m_map.end (); | |
1973 | ++iter) | |
1974 | { | |
1975 | tree key = (*iter).first; | |
1976 | if (TREE_CODE (key) == SSA_NAME) | |
1977 | if (SSA_NAME_VAR (key)) | |
1978 | key = SSA_NAME_VAR (key); | |
1979 | if (DECL_P (key)) | |
1980 | if (DECL_NAME (key) == identifier) | |
1981 | { | |
1982 | region_id rid = (*iter).second; | |
1983 | region *region = model.get_region (rid); | |
1984 | return region->get_value (const_cast<region_model &>(model), | |
1985 | false, NULL); | |
1986 | } | |
1987 | } | |
1988 | return svalue_id::null (); | |
1989 | } | |
1990 | ||
1991 | /* class struct_or_union_region : public map_region. */ | |
1992 | ||
1993 | /* Implementation of map_region::valid_key_p vfunc for | |
1994 | struct_or_union_region. */ | |
1995 | ||
1996 | bool | |
1997 | struct_or_union_region::valid_key_p (tree key) const | |
1998 | { | |
1999 | return TREE_CODE (key) == FIELD_DECL; | |
2000 | } | |
2001 | ||
2002 | /* Compare the fields of this struct_or_union_region with OTHER, returning | |
2003 | true if they are equal. | |
2004 | For use by region::operator==. */ | |
2005 | ||
2006 | bool | |
2007 | struct_or_union_region::compare_fields (const struct_or_union_region &other) | |
2008 | const | |
2009 | { | |
2010 | return map_region::compare_fields (other); | |
2011 | } | |
2012 | ||
2013 | /* class struct_region : public struct_or_union_region. */ | |
2014 | ||
2015 | /* Implementation of region::clone vfunc for struct_region. */ | |
2016 | ||
2017 | region * | |
2018 | struct_region::clone () const | |
2019 | { | |
2020 | return new struct_region (*this); | |
2021 | } | |
2022 | ||
2023 | /* Compare the fields of this struct_region with OTHER, returning true | |
2024 | if they are equal. | |
2025 | For use by region::operator==. */ | |
2026 | ||
2027 | bool | |
2028 | struct_region::compare_fields (const struct_region &other) const | |
2029 | { | |
2030 | return struct_or_union_region::compare_fields (other); | |
2031 | } | |
2032 | ||
2033 | /* class union_region : public struct_or_union_region. */ | |
2034 | ||
2035 | /* Implementation of region::clone vfunc for union_region. */ | |
2036 | ||
2037 | region * | |
2038 | union_region::clone () const | |
2039 | { | |
2040 | return new union_region (*this); | |
2041 | } | |
2042 | ||
2043 | /* Compare the fields of this union_region with OTHER, returning true | |
2044 | if they are equal. | |
2045 | For use by region::operator==. */ | |
2046 | ||
2047 | bool | |
2048 | union_region::compare_fields (const union_region &other) const | |
2049 | { | |
2050 | return struct_or_union_region::compare_fields (other); | |
2051 | } | |
2052 | ||
2053 | /* class frame_region : public map_region. */ | |
2054 | ||
2055 | /* Compare the fields of this frame_region with OTHER, returning true | |
2056 | if they are equal. | |
2057 | For use by region::operator==. */ | |
2058 | ||
2059 | bool | |
2060 | frame_region::compare_fields (const frame_region &other) const | |
2061 | { | |
2062 | if (!map_region::compare_fields (other)) | |
2063 | return false; | |
2064 | if (m_fun != other.m_fun) | |
2065 | return false; | |
2066 | if (m_depth != other.m_depth) | |
2067 | return false; | |
2068 | return true; | |
2069 | } | |
2070 | ||
2071 | /* Implementation of region::clone vfunc for frame_region. */ | |
2072 | ||
2073 | region * | |
2074 | frame_region::clone () const | |
2075 | { | |
2076 | return new frame_region (*this); | |
2077 | } | |
2078 | ||
2079 | /* Implementation of map_region::valid_key_p vfunc for frame_region. */ | |
2080 | ||
2081 | bool | |
2082 | frame_region::valid_key_p (tree key) const | |
2083 | { | |
2084 | // TODO: could also check that VAR_DECLs are locals | |
2085 | return (TREE_CODE (key) == PARM_DECL | |
2086 | || TREE_CODE (key) == VAR_DECL | |
2087 | || TREE_CODE (key) == SSA_NAME | |
2088 | || TREE_CODE (key) == RESULT_DECL); | |
2089 | } | |
2090 | ||
2091 | /* Implementation of region::print_fields vfunc for frame_region. */ | |
2092 | ||
2093 | void | |
2094 | frame_region::print_fields (const region_model &model, | |
2095 | region_id this_rid, | |
2096 | pretty_printer *pp) const | |
2097 | { | |
2098 | map_region::print_fields (model, this_rid, pp); | |
2099 | pp_printf (pp, ", function: %qs, depth: %i", function_name (m_fun), m_depth); | |
2100 | } | |
2101 | ||
2102 | /* Implementation of region::add_to_hash vfunc for frame_region. */ | |
2103 | ||
2104 | void | |
2105 | frame_region::add_to_hash (inchash::hash &hstate) const | |
2106 | { | |
2107 | map_region::add_to_hash (hstate); | |
2108 | hstate.add_ptr (m_fun); | |
2109 | hstate.add_int (m_depth); | |
2110 | } | |
2111 | ||
2112 | /* class globals_region : public scope_region. */ | |
2113 | ||
2114 | /* Compare the fields of this globals_region with OTHER, returning true | |
2115 | if they are equal. | |
2116 | For use by region::operator==. */ | |
2117 | ||
2118 | bool | |
2119 | globals_region::compare_fields (const globals_region &other) const | |
2120 | { | |
2121 | return map_region::compare_fields (other); | |
2122 | } | |
2123 | ||
2124 | /* Implementation of region::clone vfunc for globals_region. */ | |
2125 | ||
2126 | region * | |
2127 | globals_region::clone () const | |
2128 | { | |
2129 | return new globals_region (*this); | |
2130 | } | |
2131 | ||
2132 | /* Implementation of map_region::valid_key_p vfunc for globals_region. */ | |
2133 | ||
2134 | bool | |
2135 | globals_region::valid_key_p (tree key) const | |
2136 | { | |
2137 | return TREE_CODE (key) == VAR_DECL; | |
2138 | } | |
2139 | ||
2140 | /* class code_region : public map_region. */ | |
2141 | ||
2142 | /* Compare the fields of this code_region with OTHER, returning true | |
2143 | if they are equal. | |
2144 | For use by region::operator==. */ | |
2145 | ||
2146 | bool | |
2147 | code_region::compare_fields (const code_region &other) const | |
2148 | { | |
2149 | return map_region::compare_fields (other); | |
2150 | } | |
2151 | ||
2152 | /* Implementation of region::clone vfunc for code_region. */ | |
2153 | ||
2154 | region * | |
2155 | code_region::clone () const | |
2156 | { | |
2157 | return new code_region (*this); | |
2158 | } | |
2159 | ||
2160 | /* Implementation of map_region::valid_key_p vfunc for code_region. */ | |
2161 | ||
2162 | bool | |
2163 | code_region::valid_key_p (tree key) const | |
2164 | { | |
2165 | return TREE_CODE (key) == FUNCTION_DECL; | |
2166 | } | |
2167 | ||
2168 | /* class array_region : public region. */ | |
2169 | ||
2170 | /* array_region's copy ctor. */ | |
2171 | ||
2172 | array_region::array_region (const array_region &other) | |
2173 | : region (other), | |
2174 | m_map (other.m_map) | |
2175 | { | |
2176 | } | |
2177 | ||
2178 | /* Get a child region for the element with index INDEX_SID. */ | |
2179 | ||
2180 | region_id | |
2181 | array_region::get_element (region_model *model, | |
2182 | region_id this_rid, | |
2183 | svalue_id index_sid, | |
2184 | region_model_context *ctxt ATTRIBUTE_UNUSED) | |
2185 | { | |
2186 | tree element_type = TREE_TYPE (get_type ()); | |
2187 | svalue *index_sval = model->get_svalue (index_sid); | |
2188 | if (tree cst_index = index_sval->maybe_get_constant ()) | |
2189 | { | |
2190 | key_t key = key_from_constant (cst_index); | |
2191 | region_id element_rid | |
2192 | = get_or_create (model, this_rid, key, element_type); | |
2193 | return element_rid; | |
2194 | } | |
2195 | ||
2196 | return model->get_or_create_view (this_rid, element_type); | |
2197 | } | |
2198 | ||
2199 | /* Implementation of region::clone vfunc for array_region. */ | |
2200 | ||
2201 | region * | |
2202 | array_region::clone () const | |
2203 | { | |
2204 | return new array_region (*this); | |
2205 | } | |
2206 | ||
2207 | /* Compare the fields of this array_region with OTHER, returning true | |
2208 | if they are equal. | |
2209 | For use by region::operator==. */ | |
2210 | ||
2211 | bool | |
2212 | array_region::compare_fields (const array_region &other) const | |
2213 | { | |
2214 | if (m_map.elements () != other.m_map.elements ()) | |
2215 | return false; | |
2216 | ||
2217 | for (map_t::iterator iter = m_map.begin (); | |
2218 | iter != m_map.end (); | |
2219 | ++iter) | |
2220 | { | |
2221 | int key = (*iter).first; | |
2222 | region_id e = (*iter).second; | |
2223 | region_id *other_slot = const_cast <map_t &> (other.m_map).get (key); | |
2224 | if (other_slot == NULL) | |
2225 | return false; | |
2226 | if (e != *other_slot) | |
2227 | return false; | |
2228 | } | |
2229 | return true; | |
2230 | } | |
2231 | ||
2232 | /* Implementation of region::print_fields vfunc for array_region. */ | |
2233 | ||
2234 | void | |
2235 | array_region::print_fields (const region_model &model, | |
2236 | region_id this_rid, | |
2237 | pretty_printer *pp) const | |
2238 | { | |
2239 | region::print_fields (model, this_rid, pp); | |
2240 | pp_string (pp, ", array: {"); | |
2241 | for (map_t::iterator iter = m_map.begin (); | |
2242 | iter != m_map.end (); | |
2243 | ++iter) | |
2244 | { | |
2245 | if (iter != m_map.begin ()) | |
2246 | pp_string (pp, ", "); | |
2247 | int key = (*iter).first; | |
2248 | region_id child_rid = (*iter).second; | |
2249 | PUSH_IGNORE_WFORMAT | |
2250 | pp_printf (pp, "[%i]: ", key); | |
2251 | POP_IGNORE_WFORMAT | |
2252 | child_rid.print (pp); | |
2253 | } | |
2254 | pp_string (pp, "}"); | |
2255 | } | |
2256 | ||
2257 | /* Implementation of region::dump_dot_to_pp vfunc for array_region. */ | |
2258 | ||
2259 | void | |
2260 | array_region::dump_dot_to_pp (const region_model &model, | |
2261 | region_id this_rid, | |
2262 | pretty_printer *pp) const | |
2263 | { | |
2264 | region::dump_dot_to_pp (model, this_rid, pp); | |
2265 | for (map_t::iterator iter = m_map.begin (); | |
2266 | iter != m_map.end (); | |
2267 | ++iter) | |
2268 | { | |
2269 | // TODO: add nodes/edges to label things | |
2270 | ||
2271 | int key = (*iter).first; | |
2272 | region_id child_rid = (*iter).second; | |
2273 | ||
2274 | pp_printf (pp, "rid_label_%i [label=\"", child_rid.as_int ()); | |
2275 | pp_write_text_to_stream (pp); | |
2276 | PUSH_IGNORE_WFORMAT | |
2277 | pp_printf (pp, "%qi", key); | |
2278 | POP_IGNORE_WFORMAT | |
2279 | pp_write_text_as_dot_label_to_stream (pp, /*for_record=*/false); | |
2280 | pp_string (pp, "\"];"); | |
2281 | pp_newline (pp); | |
2282 | ||
2283 | pp_printf (pp, "rid_label_%i", child_rid.as_int ()); | |
2284 | pp_string (pp, " -> "); | |
2285 | child_rid.dump_node_name_to_pp (pp); | |
2286 | pp_string (pp, ";"); | |
2287 | pp_newline (pp); | |
2288 | } | |
2289 | } | |
2290 | ||
2291 | /* Implementation of region::dump_child_label vfunc for array_region. */ | |
2292 | ||
2293 | void | |
2294 | array_region::dump_child_label (const region_model &model, | |
2295 | region_id this_rid, | |
2296 | region_id child_rid, | |
2297 | pretty_printer *pp) const | |
2298 | { | |
2299 | region::dump_child_label (model, this_rid, child_rid, pp); | |
2300 | ||
2301 | for (map_t::iterator iter = m_map.begin (); | |
2302 | iter != m_map.end (); | |
2303 | ++iter) | |
2304 | { | |
2305 | if (child_rid == (*iter).second) | |
2306 | { | |
2307 | int key = (*iter).first; | |
2308 | pp_printf (pp, "[%i]: ", key); | |
2309 | } | |
2310 | } | |
2311 | } | |
2312 | ||
2313 | /* Look for a child region for KEY within this array_region. | |
2314 | If it doesn't already exist, create a child array_region, using TYPE for | |
2315 | its type. | |
2316 | Return the region_id of the child (whether pre-existing, or | |
2317 | newly-created). */ | |
2318 | ||
2319 | region_id | |
2320 | array_region::get_or_create (region_model *model, | |
2321 | region_id this_rid, | |
2322 | key_t key, | |
2323 | tree type) | |
2324 | { | |
2325 | region_id *slot = m_map.get (key); | |
2326 | if (slot) | |
2327 | return *slot; | |
2328 | region_id child_rid = model->add_region_for_type (this_rid, type); | |
2329 | m_map.put (key, child_rid); | |
2330 | return child_rid; | |
2331 | } | |
2332 | ||
2333 | /* Get the region_id for the child region for KEY within this | |
2334 | ARRAY_REGION, or NULL if there is no such child region. */ | |
2335 | ||
2336 | region_id * | |
2337 | array_region::get (key_t key) | |
2338 | { | |
2339 | region_id *slot = m_map.get (key); | |
2340 | return slot; | |
2341 | } | |
2342 | ||
2343 | /* Implementation of region::add_to_hash vfunc for array_region. */ | |
2344 | ||
2345 | void | |
2346 | array_region::add_to_hash (inchash::hash &hstate) const | |
2347 | { | |
2348 | region::add_to_hash (hstate); | |
2349 | // TODO | |
2350 | } | |
2351 | ||
2352 | /* Implementation of region::remap_region_ids vfunc for array_region. */ | |
2353 | ||
2354 | void | |
2355 | array_region::remap_region_ids (const region_id_map &map) | |
2356 | { | |
2357 | region::remap_region_ids (map); | |
2358 | ||
2359 | /* Remap the region ids within the map entries. */ | |
2360 | for (map_t::iterator iter = m_map.begin (); | |
2361 | iter != m_map.end (); ++iter) | |
2362 | map.update (&(*iter).second); | |
2363 | } | |
2364 | ||
2365 | /* Look for a child region with id CHILD_RID within this array_region. | |
2366 | If one is found, write its key to *OUT and return true, | |
2367 | otherwise return false. */ | |
2368 | ||
2369 | bool | |
2370 | array_region::get_key_for_child_region (region_id child_rid, key_t *out) const | |
2371 | { | |
2372 | // TODO: do we want to store an inverse map? | |
2373 | for (map_t::iterator iter = m_map.begin (); | |
2374 | iter != m_map.end (); | |
2375 | ++iter) | |
2376 | { | |
2377 | key_t key = (*iter).first; | |
2378 | region_id r = (*iter).second; | |
2379 | if (r == child_rid) | |
2380 | { | |
2381 | *out = key; | |
2382 | return true; | |
2383 | } | |
2384 | } | |
2385 | ||
2386 | return false; | |
2387 | } | |
2388 | ||
2389 | /* qsort comparator for int. */ | |
2390 | ||
2391 | static int | |
2392 | int_cmp (const void *p1, const void *p2) | |
2393 | { | |
2394 | int i1 = *(const int *)p1; | |
2395 | int i2 = *(const int *)p2; | |
2396 | ||
2397 | return i1 - i2; | |
2398 | } | |
2399 | ||
2400 | /* Implementation of region::walk_for_canonicalization vfunc for | |
2401 | array_region. */ | |
2402 | ||
2403 | void | |
2404 | array_region::walk_for_canonicalization (canonicalization *c) const | |
2405 | { | |
2406 | auto_vec<int> keys (m_map.elements ()); | |
2407 | for (map_t::iterator iter = m_map.begin (); | |
2408 | iter != m_map.end (); | |
2409 | ++iter) | |
2410 | { | |
2411 | int key_a = (*iter).first; | |
2412 | keys.quick_push (key_a); | |
2413 | } | |
2414 | keys.qsort (int_cmp); | |
2415 | ||
2416 | unsigned i; | |
2417 | int key; | |
2418 | FOR_EACH_VEC_ELT (keys, i, key) | |
2419 | { | |
2420 | region_id rid = *const_cast<array_region *>(this)->m_map.get (key); | |
2421 | c->walk_rid (rid); | |
2422 | } | |
2423 | } | |
2424 | ||
2425 | /* Convert constant CST into an array_region::key_t. */ | |
2426 | ||
2427 | array_region::key_t | |
2428 | array_region::key_from_constant (tree cst) | |
2429 | { | |
2430 | gcc_assert (CONSTANT_CLASS_P (cst)); | |
2431 | wide_int w = wi::to_wide (cst); | |
2432 | key_t result = w.to_shwi (); | |
2433 | return result; | |
2434 | } | |
2435 | ||
2436 | /* class function_region : public map_region. */ | |
2437 | ||
2438 | /* Compare the fields of this function_region with OTHER, returning true | |
2439 | if they are equal. | |
2440 | For use by region::operator==. */ | |
2441 | ||
2442 | bool | |
2443 | function_region::compare_fields (const function_region &other) const | |
2444 | { | |
2445 | return map_region::compare_fields (other); | |
2446 | } | |
2447 | ||
2448 | /* Implementation of region::clone vfunc for function_region. */ | |
2449 | ||
2450 | region * | |
2451 | function_region::clone () const | |
2452 | { | |
2453 | return new function_region (*this); | |
2454 | } | |
2455 | ||
2456 | /* Implementation of map_region::valid_key_p vfunc for function_region. */ | |
2457 | ||
2458 | bool | |
2459 | function_region::valid_key_p (tree key) const | |
2460 | { | |
2461 | return TREE_CODE (key) == LABEL_DECL; | |
2462 | } | |
2463 | ||
2464 | /* class stack_region : public region. */ | |
2465 | ||
2466 | /* stack_region's copy ctor. */ | |
2467 | ||
2468 | stack_region::stack_region (const stack_region &other) | |
2469 | : region (other), | |
2470 | m_frame_rids (other.m_frame_rids.length ()) | |
2471 | { | |
2472 | int i; | |
2473 | region_id *frame_rid; | |
2474 | FOR_EACH_VEC_ELT (other.m_frame_rids, i, frame_rid) | |
2475 | m_frame_rids.quick_push (*frame_rid); | |
2476 | } | |
2477 | ||
2478 | /* Compare the fields of this stack_region with OTHER, returning true | |
2479 | if they are equal. | |
2480 | For use by region::operator==. */ | |
2481 | ||
2482 | bool | |
2483 | stack_region::compare_fields (const stack_region &other) const | |
2484 | { | |
2485 | if (m_frame_rids.length () != other.m_frame_rids.length ()) | |
2486 | return false; | |
2487 | ||
2488 | int i; | |
2489 | region_id *frame_rid; | |
2490 | FOR_EACH_VEC_ELT (m_frame_rids, i, frame_rid) | |
2491 | if (m_frame_rids[i] != other.m_frame_rids[i]) | |
2492 | return false; | |
2493 | ||
2494 | return true; | |
2495 | } | |
2496 | ||
2497 | /* Implementation of region::clone vfunc for stack_region. */ | |
2498 | ||
2499 | region * | |
2500 | stack_region::clone () const | |
2501 | { | |
2502 | return new stack_region (*this); | |
2503 | } | |
2504 | ||
2505 | /* Implementation of region::print_fields vfunc for stack_region. */ | |
2506 | ||
2507 | void | |
2508 | stack_region::print_fields (const region_model &model, | |
2509 | region_id this_rid, | |
2510 | pretty_printer *pp) const | |
2511 | { | |
2512 | region::print_fields (model, this_rid, pp); | |
2513 | // TODO | |
2514 | } | |
2515 | ||
2516 | /* Implementation of region::dump_child_label vfunc for stack_region. */ | |
2517 | ||
2518 | void | |
2519 | stack_region::dump_child_label (const region_model &model, | |
2520 | region_id this_rid ATTRIBUTE_UNUSED, | |
2521 | region_id child_rid, | |
2522 | pretty_printer *pp) const | |
2523 | { | |
2524 | function *fun = model.get_region<frame_region> (child_rid)->get_function (); | |
2525 | pp_printf (pp, "frame for %qs: ", function_name (fun)); | |
2526 | } | |
2527 | ||
2528 | /* Push FRAME_RID (for a frame_region) onto this stack. */ | |
2529 | ||
2530 | void | |
2531 | stack_region::push_frame (region_id frame_rid) | |
2532 | { | |
2533 | m_frame_rids.safe_push (frame_rid); | |
2534 | } | |
2535 | ||
2536 | /* Get the region_id of the top-most frame in this stack, if any. */ | |
2537 | ||
2538 | region_id | |
2539 | stack_region::get_current_frame_id () const | |
2540 | { | |
2541 | if (m_frame_rids.length () > 0) | |
2542 | return m_frame_rids[m_frame_rids.length () - 1]; | |
2543 | else | |
2544 | return region_id::null (); | |
2545 | } | |
2546 | ||
2547 | /* Pop the topmost frame_region from this stack. | |
2548 | ||
2549 | Purge the frame region and all its descendent regions. | |
2550 | Convert any pointers that point into such regions into | |
2551 | POISON_KIND_POPPED_STACK svalues. | |
2552 | ||
2553 | Return the ID of any return value from the frame. | |
2554 | ||
2555 | If PURGE, then purge all unused svalues, with the exception of any | |
2556 | return value for the frame, which is temporarily | |
2557 | preserved in case no regions reference it, so it can | |
2558 | be written into a region in the caller. | |
2559 | ||
2560 | Accumulate stats on purged entities into STATS. */ | |
2561 | ||
2562 | svalue_id | |
2563 | stack_region::pop_frame (region_model *model, bool purge, purge_stats *stats, | |
2564 | region_model_context *ctxt) | |
2565 | { | |
2566 | gcc_assert (m_frame_rids.length () > 0); | |
2567 | ||
2568 | region_id frame_rid = get_current_frame_id (); | |
2569 | frame_region *frame = model->get_region<frame_region> (frame_rid); | |
2570 | ||
2571 | /* Evaluate the result, within the callee frame. */ | |
2572 | svalue_id result_sid; | |
2573 | tree fndecl = frame->get_function ()->decl; | |
2574 | tree result = DECL_RESULT (fndecl); | |
2575 | if (result && TREE_TYPE (result) != void_type_node) | |
2576 | result_sid = model->get_rvalue (result, ctxt); | |
2577 | ||
2578 | /* Pop the frame RID. */ | |
2579 | m_frame_rids.pop (); | |
2580 | ||
2581 | model->delete_region_and_descendents (frame_rid, | |
2582 | POISON_KIND_POPPED_STACK, | |
2583 | stats, | |
2584 | ctxt ? ctxt->get_logger () : NULL); | |
2585 | ||
2586 | /* Delete unused svalues, but don't delete the return value. */ | |
2587 | if (purge) | |
2588 | model->purge_unused_svalues (stats, ctxt, &result_sid); | |
2589 | ||
2590 | model->validate (); | |
2591 | ||
2592 | return result_sid; | |
2593 | } | |
2594 | ||
2595 | /* Implementation of region::add_to_hash vfunc for stack_region. */ | |
2596 | ||
2597 | void | |
2598 | stack_region::add_to_hash (inchash::hash &hstate) const | |
2599 | { | |
2600 | region::add_to_hash (hstate); | |
2601 | ||
2602 | int i; | |
2603 | region_id *frame_rid; | |
2604 | FOR_EACH_VEC_ELT (m_frame_rids, i, frame_rid) | |
2605 | inchash::add (*frame_rid, hstate); | |
2606 | } | |
2607 | ||
2608 | /* Implementation of region::remap_region_ids vfunc for stack_region. */ | |
2609 | ||
2610 | void | |
2611 | stack_region::remap_region_ids (const region_id_map &map) | |
2612 | { | |
2613 | region::remap_region_ids (map); | |
2614 | int i; | |
2615 | region_id *frame_rid; | |
2616 | FOR_EACH_VEC_ELT (m_frame_rids, i, frame_rid) | |
2617 | map.update (&m_frame_rids[i]); | |
2618 | } | |
2619 | ||
2620 | /* Attempt to merge STACK_REGION_A and STACK_REGION_B using MERGER. | |
2621 | Return true if the merger is possible, false otherwise. */ | |
2622 | ||
2623 | bool | |
2624 | stack_region::can_merge_p (const stack_region *stack_region_a, | |
2625 | const stack_region *stack_region_b, | |
2626 | model_merger *merger) | |
2627 | { | |
2628 | if (stack_region_a->get_num_frames () | |
2629 | != stack_region_b->get_num_frames ()) | |
2630 | return false; | |
2631 | ||
2632 | region_model *merged_model = merger->m_merged_model; | |
2633 | ||
2634 | region_id rid_merged_stack | |
2635 | = merged_model->get_root_region ()->ensure_stack_region (merged_model); | |
2636 | ||
2637 | stack_region *merged_stack | |
2638 | = merged_model->get_region <stack_region> (rid_merged_stack); | |
2639 | ||
2640 | for (unsigned i = 0; i < stack_region_a->get_num_frames (); i++) | |
2641 | { | |
2642 | region_id rid_a = stack_region_a->get_frame_rid (i); | |
2643 | frame_region *frame_a = merger->get_region_a <frame_region> (rid_a); | |
2644 | ||
2645 | region_id rid_b = stack_region_b->get_frame_rid (i); | |
2646 | frame_region *frame_b = merger->get_region_b <frame_region> (rid_b); | |
2647 | ||
2648 | if (frame_a->get_function () != frame_b->get_function ()) | |
2649 | return false; | |
2650 | frame_region *merged_frame = new frame_region (rid_merged_stack, | |
2651 | frame_a->get_function (), | |
2652 | frame_a->get_depth ()); | |
2653 | region_id rid_merged_frame = merged_model->add_region (merged_frame); | |
2654 | merged_stack->push_frame (rid_merged_frame); | |
2655 | ||
2656 | if (!map_region::can_merge_p (frame_a, frame_b, | |
2657 | merged_frame, rid_merged_frame, | |
2658 | merger)) | |
2659 | return false; | |
2660 | } | |
2661 | ||
2662 | return true; | |
2663 | } | |
2664 | ||
2665 | /* Implementation of region::walk_for_canonicalization vfunc for | |
2666 | stack_region. */ | |
2667 | ||
2668 | void | |
2669 | stack_region::walk_for_canonicalization (canonicalization *c) const | |
2670 | { | |
2671 | int i; | |
2672 | region_id *frame_rid; | |
2673 | FOR_EACH_VEC_ELT (m_frame_rids, i, frame_rid) | |
2674 | c->walk_rid (*frame_rid); | |
2675 | } | |
2676 | ||
2677 | /* For debugging purposes: look for a grandchild region within one of | |
2678 | the child frame regions, where the grandchild is for a decl named | |
2679 | IDENTIFIER (or an SSA_NAME for such a decl): | |
2680 | ||
2681 | stack_region | |
2682 | `-frame_region | |
2683 | `-region for decl named IDENTIFIER | |
2684 | ||
2685 | returning its value, or svalue_id::null if none are found. */ | |
2686 | ||
2687 | svalue_id | |
2688 | stack_region::get_value_by_name (tree identifier, | |
2689 | const region_model &model) const | |
2690 | { | |
2691 | int i; | |
2692 | region_id *frame_rid; | |
2693 | FOR_EACH_VEC_ELT (m_frame_rids, i, frame_rid) | |
2694 | { | |
2695 | frame_region *frame = model.get_region<frame_region> (*frame_rid); | |
2696 | svalue_id sid = frame->get_value_by_name (identifier, model); | |
2697 | if (!sid.null_p ()) | |
2698 | return sid; | |
2699 | } | |
2700 | ||
2701 | return svalue_id::null (); | |
2702 | } | |
2703 | ||
2704 | /* class heap_region : public region. */ | |
2705 | ||
2706 | /* heap_region's copy ctor. */ | |
2707 | ||
2708 | heap_region::heap_region (const heap_region &other) | |
2709 | : region (other) | |
2710 | { | |
2711 | } | |
2712 | ||
2713 | /* Compare the fields of this heap_region with OTHER, returning true | |
2714 | if they are equal. | |
2715 | For use by region::operator==. */ | |
2716 | ||
2717 | bool | |
2718 | heap_region::compare_fields (const heap_region &) const | |
2719 | { | |
2720 | /* Empty. */ | |
2721 | return true; | |
2722 | } | |
2723 | ||
2724 | /* Implementation of region::clone vfunc for heap_region. */ | |
2725 | ||
2726 | region * | |
2727 | heap_region::clone () const | |
2728 | { | |
2729 | return new heap_region (*this); | |
2730 | } | |
2731 | ||
2732 | /* Implementation of region::walk_for_canonicalization vfunc for | |
2733 | heap_region. */ | |
2734 | ||
2735 | void | |
2736 | heap_region::walk_for_canonicalization (canonicalization *) const | |
2737 | { | |
2738 | /* Empty. */ | |
2739 | } | |
2740 | ||
2741 | /* class root_region : public region. */ | |
2742 | ||
2743 | /* root_region's default ctor. */ | |
2744 | ||
2745 | root_region::root_region () | |
2746 | : region (region_id::null (), | |
2747 | svalue_id::null (), | |
2748 | NULL_TREE) | |
2749 | { | |
2750 | } | |
2751 | ||
2752 | /* root_region's copy ctor. */ | |
2753 | ||
2754 | root_region::root_region (const root_region &other) | |
2755 | : region (other), | |
2756 | m_stack_rid (other.m_stack_rid), | |
2757 | m_globals_rid (other.m_globals_rid), | |
2758 | m_code_rid (other.m_code_rid), | |
2759 | m_heap_rid (other.m_heap_rid) | |
2760 | { | |
2761 | } | |
2762 | ||
2763 | /* Compare the fields of this root_region with OTHER, returning true | |
2764 | if they are equal. | |
2765 | For use by region::operator==. */ | |
2766 | ||
2767 | bool | |
2768 | root_region::compare_fields (const root_region &other) const | |
2769 | { | |
2770 | if (m_stack_rid != other.m_stack_rid) | |
2771 | return false; | |
2772 | if (m_globals_rid != other.m_globals_rid) | |
2773 | return false; | |
2774 | if (m_code_rid != other.m_code_rid) | |
2775 | return false; | |
2776 | if (m_heap_rid != other.m_heap_rid) | |
2777 | return false; | |
2778 | return true; | |
2779 | } | |
2780 | ||
2781 | /* Implementation of region::clone vfunc for root_region. */ | |
2782 | ||
2783 | region * | |
2784 | root_region::clone () const | |
2785 | { | |
2786 | return new root_region (*this); | |
2787 | } | |
2788 | ||
2789 | /* Implementation of region::print_fields vfunc for root_region. */ | |
2790 | ||
2791 | void | |
2792 | root_region::print_fields (const region_model &model, | |
2793 | region_id this_rid, | |
2794 | pretty_printer *pp) const | |
2795 | { | |
2796 | region::print_fields (model, this_rid, pp); | |
2797 | // TODO | |
2798 | } | |
2799 | ||
2800 | /* Implementation of region::dump_child_label vfunc for root_region. */ | |
2801 | ||
2802 | void | |
2803 | root_region::dump_child_label (const region_model &model ATTRIBUTE_UNUSED, | |
2804 | region_id this_rid ATTRIBUTE_UNUSED, | |
2805 | region_id child_rid, | |
2806 | pretty_printer *pp) const | |
2807 | { | |
2808 | if (child_rid == m_stack_rid) | |
2809 | pp_printf (pp, "stack: "); | |
2810 | else if (child_rid == m_globals_rid) | |
2811 | pp_printf (pp, "globals: "); | |
2812 | else if (child_rid == m_code_rid) | |
2813 | pp_printf (pp, "code: "); | |
2814 | else if (child_rid == m_heap_rid) | |
2815 | pp_printf (pp, "heap: "); | |
2816 | } | |
2817 | ||
2818 | /* Create a new frame_region for a call to FUN and push it onto | |
2819 | the stack. | |
2820 | ||
2821 | If ARG_SIDS is non-NULL, use it to populate the parameters | |
2822 | in the new frame. | |
2823 | Otherwise, populate them with unknown values. | |
2824 | ||
2825 | Return the region_id of the new frame. */ | |
2826 | ||
2827 | region_id | |
2828 | root_region::push_frame (region_model *model, function *fun, | |
2829 | vec<svalue_id> *arg_sids, | |
2830 | region_model_context *ctxt) | |
2831 | { | |
2832 | gcc_assert (fun); | |
2833 | /* arg_sids can be NULL. */ | |
2834 | ||
2835 | ensure_stack_region (model); | |
2836 | stack_region *stack = model->get_region <stack_region> (m_stack_rid); | |
2837 | ||
2838 | frame_region *region = new frame_region (m_stack_rid, fun, | |
2839 | stack->get_num_frames ()); | |
2840 | region_id frame_rid = model->add_region (region); | |
2841 | ||
2842 | // TODO: unify these cases by building a vec of unknown? | |
2843 | ||
2844 | if (arg_sids) | |
2845 | { | |
2846 | /* Arguments supplied from a caller frame. */ | |
2847 | ||
2848 | tree fndecl = fun->decl; | |
2849 | unsigned idx = 0; | |
2850 | for (tree iter_parm = DECL_ARGUMENTS (fndecl); iter_parm; | |
2851 | iter_parm = DECL_CHAIN (iter_parm), ++idx) | |
2852 | { | |
2853 | /* If there's a mismatching declaration, the call stmt might | |
2854 | not have enough args. Handle this case by leaving the | |
2855 | rest of the params as uninitialized. */ | |
2856 | if (idx >= arg_sids->length ()) | |
2857 | break; | |
2858 | svalue_id arg_sid = (*arg_sids)[idx]; | |
2859 | region_id parm_rid | |
2860 | = region->get_or_create (model, frame_rid, iter_parm, | |
2861 | TREE_TYPE (iter_parm)); | |
2862 | model->set_value (parm_rid, arg_sid, ctxt); | |
2863 | ||
2864 | /* Also do it for default SSA name (sharing the same unknown | |
2865 | value). */ | |
2866 | tree parm_default_ssa = ssa_default_def (fun, iter_parm); | |
2867 | if (parm_default_ssa) | |
2868 | { | |
2869 | region_id defssa_rid | |
2870 | = region->get_or_create (model, frame_rid, parm_default_ssa, | |
2871 | TREE_TYPE (iter_parm)); | |
2872 | model->set_value (defssa_rid, arg_sid, ctxt); | |
2873 | } | |
2874 | } | |
2875 | } | |
2876 | else | |
2877 | { | |
2878 | /* No known arguments (a top-level call within the analysis). */ | |
2879 | ||
2880 | /* Params have a defined, unknown value; they should not inherit | |
2881 | from the poisoned uninit value. */ | |
2882 | tree fndecl = fun->decl; | |
2883 | for (tree iter_parm = DECL_ARGUMENTS (fndecl); iter_parm; | |
2884 | iter_parm = DECL_CHAIN (iter_parm)) | |
2885 | { | |
2886 | region_id parm_rid | |
2887 | = region->get_or_create (model, frame_rid, iter_parm, | |
2888 | TREE_TYPE (iter_parm)); | |
2889 | svalue_id parm_sid | |
2890 | = model->set_to_new_unknown_value (parm_rid, TREE_TYPE (iter_parm), | |
2891 | ctxt); | |
2892 | ||
2893 | /* Also do it for default SSA name (sharing the same unknown | |
2894 | value). */ | |
2895 | tree parm_default_ssa = ssa_default_def (fun, iter_parm); | |
2896 | if (parm_default_ssa) | |
2897 | { | |
2898 | region_id defssa_rid | |
2899 | = region->get_or_create (model, frame_rid, parm_default_ssa, | |
2900 | TREE_TYPE (iter_parm)); | |
2901 | model->get_region (defssa_rid)->set_value (*model, defssa_rid, | |
2902 | parm_sid, ctxt); | |
2903 | } | |
2904 | } | |
2905 | } | |
2906 | ||
2907 | stack->push_frame (frame_rid); | |
2908 | ||
2909 | return frame_rid; | |
2910 | } | |
2911 | ||
2912 | /* Get the region_id of the top-most frame in this root_region's stack, | |
2913 | if any. */ | |
2914 | ||
2915 | region_id | |
2916 | root_region::get_current_frame_id (const region_model &model) const | |
2917 | { | |
2918 | stack_region *stack = model.get_region <stack_region> (m_stack_rid); | |
2919 | if (stack) | |
2920 | return stack->get_current_frame_id (); | |
2921 | else | |
2922 | return region_id::null (); | |
2923 | } | |
2924 | ||
2925 | /* Pop the topmost frame_region from this root_region's stack; | |
2926 | see the comment for stack_region::pop_frame. */ | |
2927 | ||
2928 | svalue_id | |
2929 | root_region::pop_frame (region_model *model, bool purge, purge_stats *out, | |
2930 | region_model_context *ctxt) | |
2931 | { | |
2932 | stack_region *stack = model->get_region <stack_region> (m_stack_rid); | |
2933 | return stack->pop_frame (model, purge, out, ctxt); | |
2934 | } | |
2935 | ||
2936 | /* Return the region_id of the stack region, creating it if doesn't | |
2937 | already exist. */ | |
2938 | ||
2939 | region_id | |
2940 | root_region::ensure_stack_region (region_model *model) | |
2941 | { | |
2942 | if (m_stack_rid.null_p ()) | |
2943 | { | |
2944 | svalue_id uninit_sid | |
2945 | = model->add_svalue (new poisoned_svalue (POISON_KIND_UNINIT, | |
2946 | NULL_TREE)); | |
2947 | m_stack_rid | |
2948 | = model->add_region (new stack_region (model->get_root_rid (), | |
2949 | uninit_sid)); | |
2950 | } | |
2951 | return m_stack_rid; | |
2952 | } | |
2953 | ||
2954 | /* Return the stack region (which could be NULL). */ | |
2955 | ||
2956 | stack_region * | |
2957 | root_region::get_stack_region (const region_model *model) const | |
2958 | { | |
2959 | return model->get_region <stack_region> (m_stack_rid); | |
2960 | } | |
2961 | ||
2962 | /* Return the region_id of the globals region, creating it if doesn't | |
2963 | already exist. */ | |
2964 | ||
2965 | region_id | |
2966 | root_region::ensure_globals_region (region_model *model) | |
2967 | { | |
2968 | if (m_globals_rid.null_p ()) | |
2969 | m_globals_rid | |
2970 | = model->add_region (new globals_region (model->get_root_rid ())); | |
2971 | return m_globals_rid; | |
2972 | } | |
2973 | ||
2974 | /* Return the code region (which could be NULL). */ | |
2975 | ||
2976 | code_region * | |
2977 | root_region::get_code_region (const region_model *model) const | |
2978 | { | |
2979 | return model->get_region <code_region> (m_code_rid); | |
2980 | } | |
2981 | ||
2982 | /* Return the region_id of the code region, creating it if doesn't | |
2983 | already exist. */ | |
2984 | ||
2985 | region_id | |
2986 | root_region::ensure_code_region (region_model *model) | |
2987 | { | |
2988 | if (m_code_rid.null_p ()) | |
2989 | m_code_rid | |
2990 | = model->add_region (new code_region (model->get_root_rid ())); | |
2991 | return m_code_rid; | |
2992 | } | |
2993 | ||
2994 | /* Return the globals region (which could be NULL). */ | |
2995 | ||
2996 | globals_region * | |
2997 | root_region::get_globals_region (const region_model *model) const | |
2998 | { | |
2999 | return model->get_region <globals_region> (m_globals_rid); | |
3000 | } | |
3001 | ||
3002 | /* Return the region_id of the heap region, creating it if doesn't | |
3003 | already exist. */ | |
3004 | ||
3005 | region_id | |
3006 | root_region::ensure_heap_region (region_model *model) | |
3007 | { | |
3008 | if (m_heap_rid.null_p ()) | |
3009 | { | |
3010 | svalue_id uninit_sid | |
3011 | = model->add_svalue (new poisoned_svalue (POISON_KIND_UNINIT, | |
3012 | NULL_TREE)); | |
3013 | m_heap_rid | |
3014 | = model->add_region (new heap_region (model->get_root_rid (), | |
3015 | uninit_sid)); | |
3016 | } | |
3017 | return m_heap_rid; | |
3018 | } | |
3019 | ||
3020 | /* Return the heap region (which could be NULL). */ | |
3021 | ||
3022 | heap_region * | |
3023 | root_region::get_heap_region (const region_model *model) const | |
3024 | { | |
3025 | return model->get_region <heap_region> (m_heap_rid); | |
3026 | } | |
3027 | ||
3028 | /* Implementation of region::remap_region_ids vfunc for root_region. */ | |
3029 | ||
3030 | void | |
3031 | root_region::remap_region_ids (const region_id_map &map) | |
3032 | { | |
3033 | map.update (&m_stack_rid); | |
3034 | map.update (&m_globals_rid); | |
3035 | map.update (&m_code_rid); | |
3036 | map.update (&m_heap_rid); | |
3037 | } | |
3038 | ||
3039 | /* Attempt to merge ROOT_REGION_A and ROOT_REGION_B into | |
3040 | MERGED_ROOT_REGION using MERGER. | |
3041 | Return true if the merger is possible, false otherwise. */ | |
3042 | ||
3043 | bool | |
3044 | root_region::can_merge_p (const root_region *root_region_a, | |
3045 | const root_region *root_region_b, | |
3046 | root_region *merged_root_region, | |
3047 | model_merger *merger) | |
3048 | { | |
3049 | /* We can only merge if the stacks are sufficiently similar. */ | |
3050 | stack_region *stack_a = root_region_a->get_stack_region (merger->m_model_a); | |
3051 | stack_region *stack_b = root_region_b->get_stack_region (merger->m_model_b); | |
3052 | if (stack_a && stack_b) | |
3053 | { | |
3054 | /* If the two models both have a stack, attempt to merge them. */ | |
3055 | merged_root_region->ensure_stack_region (merger->m_merged_model); | |
3056 | if (!stack_region::can_merge_p (stack_a, stack_b, merger)) | |
3057 | return false; | |
3058 | } | |
3059 | else if (stack_a || stack_b) | |
3060 | /* Don't attempt to merge if one model has a stack and the other | |
3061 | doesn't. */ | |
3062 | return false; | |
3063 | ||
3064 | map_region *globals_a = root_region_a->get_globals_region (merger->m_model_a); | |
3065 | map_region *globals_b = root_region_b->get_globals_region (merger->m_model_b); | |
3066 | if (globals_a && globals_b) | |
3067 | { | |
3068 | /* If both models have globals regions, attempt to merge them. */ | |
3069 | region_id merged_globals_rid | |
3070 | = merged_root_region->ensure_globals_region (merger->m_merged_model); | |
3071 | map_region *merged_globals | |
3072 | = merged_root_region->get_globals_region (merger->m_merged_model); | |
3073 | if (!map_region::can_merge_p (globals_a, globals_b, | |
3074 | merged_globals, merged_globals_rid, | |
3075 | merger)) | |
3076 | return false; | |
3077 | } | |
3078 | /* otherwise, merge as "no globals". */ | |
3079 | ||
3080 | map_region *code_a = root_region_a->get_code_region (merger->m_model_a); | |
3081 | map_region *code_b = root_region_b->get_code_region (merger->m_model_b); | |
3082 | if (code_a && code_b) | |
3083 | { | |
3084 | /* If both models have code regions, attempt to merge them. */ | |
3085 | region_id merged_code_rid | |
3086 | = merged_root_region->ensure_code_region (merger->m_merged_model); | |
3087 | map_region *merged_code | |
3088 | = merged_root_region->get_code_region (merger->m_merged_model); | |
3089 | if (!map_region::can_merge_p (code_a, code_b, | |
3090 | merged_code, merged_code_rid, | |
3091 | merger)) | |
3092 | return false; | |
3093 | } | |
3094 | /* otherwise, merge as "no code". */ | |
3095 | ||
3096 | heap_region *heap_a = root_region_a->get_heap_region (merger->m_model_a); | |
3097 | heap_region *heap_b = root_region_b->get_heap_region (merger->m_model_b); | |
3098 | if (heap_a && heap_b) | |
3099 | { | |
3100 | /* If both have a heap, create a "merged" heap. | |
3101 | Actually merging the heap contents happens via the region_svalue | |
3102 | instances, as needed, when seeing pairs of region_svalue instances. */ | |
3103 | merged_root_region->ensure_heap_region (merger->m_merged_model); | |
3104 | } | |
3105 | /* otherwise, merge as "no heap". */ | |
3106 | ||
3107 | return true; | |
3108 | } | |
3109 | ||
3110 | /* Implementation of region::add_to_hash vfunc for root_region. */ | |
3111 | ||
3112 | void | |
3113 | root_region::add_to_hash (inchash::hash &hstate) const | |
3114 | { | |
3115 | region::add_to_hash (hstate); | |
3116 | inchash::add (m_stack_rid, hstate); | |
3117 | inchash::add (m_globals_rid, hstate); | |
3118 | inchash::add (m_code_rid, hstate); | |
3119 | inchash::add (m_heap_rid, hstate); | |
3120 | } | |
3121 | ||
3122 | /* Implementation of region::walk_for_canonicalization vfunc for | |
3123 | root_region. */ | |
3124 | ||
3125 | void | |
3126 | root_region::walk_for_canonicalization (canonicalization *c) const | |
3127 | { | |
3128 | c->walk_rid (m_stack_rid); | |
3129 | c->walk_rid (m_globals_rid); | |
3130 | c->walk_rid (m_code_rid); | |
3131 | c->walk_rid (m_heap_rid); | |
3132 | } | |
3133 | ||
3134 | /* For debugging purposes: look for a descendant region for a local | |
3135 | or global decl named IDENTIFIER (or an SSA_NAME for such a decl), | |
3136 | returning its value, or svalue_id::null if none are found. */ | |
3137 | ||
3138 | svalue_id | |
3139 | root_region::get_value_by_name (tree identifier, | |
3140 | const region_model &model) const | |
3141 | { | |
3142 | if (stack_region *stack = get_stack_region (&model)) | |
3143 | { | |
3144 | svalue_id sid = stack->get_value_by_name (identifier, model); | |
3145 | if (!sid.null_p ()) | |
3146 | return sid; | |
3147 | } | |
3148 | if (map_region *globals = get_globals_region (&model)) | |
3149 | { | |
3150 | svalue_id sid = globals->get_value_by_name (identifier, model); | |
3151 | if (!sid.null_p ()) | |
3152 | return sid; | |
3153 | } | |
3154 | return svalue_id::null (); | |
3155 | } | |
3156 | ||
3157 | /* class symbolic_region : public map_region. */ | |
3158 | ||
3159 | /* symbolic_region's copy ctor. */ | |
3160 | ||
3161 | symbolic_region::symbolic_region (const symbolic_region &other) | |
3162 | : region (other), | |
3163 | m_possibly_null (other.m_possibly_null) | |
3164 | { | |
3165 | } | |
3166 | ||
3167 | /* Compare the fields of this symbolic_region with OTHER, returning true | |
3168 | if they are equal. | |
3169 | For use by region::operator==. */ | |
3170 | ||
3171 | bool | |
3172 | symbolic_region::compare_fields (const symbolic_region &other) const | |
3173 | { | |
3174 | return m_possibly_null == other.m_possibly_null; | |
3175 | } | |
3176 | ||
3177 | /* Implementation of region::clone vfunc for symbolic_region. */ | |
3178 | ||
3179 | region * | |
3180 | symbolic_region::clone () const | |
3181 | { | |
3182 | return new symbolic_region (*this); | |
3183 | } | |
3184 | ||
3185 | /* Implementation of region::walk_for_canonicalization vfunc for | |
3186 | symbolic_region. */ | |
3187 | ||
3188 | void | |
3189 | symbolic_region::walk_for_canonicalization (canonicalization *) const | |
3190 | { | |
3191 | /* Empty. */ | |
3192 | } | |
3193 | ||
3194 | /* class region_model. */ | |
3195 | ||
3196 | /* region_model's default ctor. */ | |
3197 | ||
3198 | region_model::region_model () | |
3199 | { | |
3200 | m_root_rid = add_region (new root_region ()); | |
3201 | m_constraints = new impl_constraint_manager (this); | |
3202 | // TODO | |
3203 | } | |
3204 | ||
3205 | /* region_model's copy ctor. */ | |
3206 | ||
3207 | region_model::region_model (const region_model &other) | |
3208 | : m_svalues (other.m_svalues.length ()), | |
3209 | m_regions (other.m_regions.length ()), | |
3210 | m_root_rid (other.m_root_rid) | |
3211 | { | |
3212 | /* Clone the svalues and regions. */ | |
3213 | int i; | |
3214 | ||
3215 | svalue *svalue; | |
3216 | FOR_EACH_VEC_ELT (other.m_svalues, i, svalue) | |
3217 | m_svalues.quick_push (svalue->clone ()); | |
3218 | ||
3219 | region *region; | |
3220 | FOR_EACH_VEC_ELT (other.m_regions, i, region) | |
3221 | m_regions.quick_push (region->clone ()); | |
3222 | ||
3223 | m_constraints = other.m_constraints->clone (this); | |
3224 | } | |
3225 | ||
3226 | /* region_model's dtor. */ | |
3227 | ||
3228 | region_model::~region_model () | |
3229 | { | |
3230 | delete m_constraints; | |
3231 | } | |
3232 | ||
3233 | /* region_model's assignment operator. */ | |
3234 | ||
3235 | region_model & | |
3236 | region_model::operator= (const region_model &other) | |
3237 | { | |
3238 | unsigned i; | |
3239 | svalue *svalue; | |
3240 | region *region; | |
3241 | ||
3242 | /* Delete existing content. */ | |
3243 | FOR_EACH_VEC_ELT (m_svalues, i, svalue) | |
3244 | delete svalue; | |
3245 | m_svalues.truncate (0); | |
3246 | ||
3247 | FOR_EACH_VEC_ELT (m_regions, i, region) | |
3248 | delete region; | |
3249 | m_regions.truncate (0); | |
3250 | ||
3251 | delete m_constraints; | |
3252 | ||
3253 | /* Clone the svalues and regions. */ | |
3254 | m_svalues.reserve (other.m_svalues.length (), true); | |
3255 | FOR_EACH_VEC_ELT (other.m_svalues, i, svalue) | |
3256 | m_svalues.quick_push (svalue->clone ()); | |
3257 | ||
3258 | m_regions.reserve (other.m_regions.length (), true); | |
3259 | FOR_EACH_VEC_ELT (other.m_regions, i, region) | |
3260 | m_regions.quick_push (region->clone ()); | |
3261 | ||
3262 | m_root_rid = other.m_root_rid; | |
3263 | ||
3264 | m_constraints = other.m_constraints->clone (this); | |
3265 | ||
3266 | return *this; | |
3267 | } | |
3268 | ||
3269 | /* Equality operator for region_model. | |
3270 | ||
3271 | Amongst other things this directly compares the svalue and region | |
3272 | vectors and so for this to be meaningful both this and OTHER should | |
3273 | have been canonicalized. */ | |
3274 | ||
3275 | bool | |
3276 | region_model::operator== (const region_model &other) const | |
3277 | { | |
3278 | if (m_root_rid != other.m_root_rid) | |
3279 | return false; | |
3280 | ||
3281 | if (m_svalues.length () != other.m_svalues.length ()) | |
3282 | return false; | |
3283 | ||
3284 | if (m_regions.length () != other.m_regions.length ()) | |
3285 | return false; | |
3286 | ||
3287 | if (*m_constraints != *other.m_constraints) | |
3288 | return false; | |
3289 | ||
3290 | unsigned i; | |
3291 | svalue *svalue; | |
3292 | FOR_EACH_VEC_ELT (other.m_svalues, i, svalue) | |
3293 | if (!(*m_svalues[i] == *other.m_svalues[i])) | |
3294 | return false; | |
3295 | ||
3296 | region *region; | |
3297 | FOR_EACH_VEC_ELT (other.m_regions, i, region) | |
3298 | if (!(*m_regions[i] == *other.m_regions[i])) | |
3299 | return false; | |
3300 | ||
3301 | gcc_checking_assert (hash () == other.hash ()); | |
3302 | ||
3303 | return true; | |
3304 | } | |
3305 | ||
3306 | /* Generate a hash value for this region_model. */ | |
3307 | ||
3308 | hashval_t | |
3309 | region_model::hash () const | |
3310 | { | |
3311 | hashval_t result = 0; | |
3312 | int i; | |
3313 | ||
3314 | svalue *svalue; | |
3315 | FOR_EACH_VEC_ELT (m_svalues, i, svalue) | |
3316 | result ^= svalue->hash (); | |
3317 | ||
3318 | region *region; | |
3319 | FOR_EACH_VEC_ELT (m_regions, i, region) | |
3320 | result ^= region->hash (); | |
3321 | ||
3322 | result ^= m_constraints->hash (); | |
3323 | ||
3324 | return result; | |
3325 | } | |
3326 | ||
3327 | /* Print an all-on-one-line representation of this region_model to PP, | |
3328 | which must support %E for trees. */ | |
3329 | ||
3330 | void | |
3331 | region_model::print (pretty_printer *pp) const | |
3332 | { | |
3333 | int i; | |
3334 | ||
3335 | pp_string (pp, "svalues: ["); | |
3336 | svalue *svalue; | |
3337 | FOR_EACH_VEC_ELT (m_svalues, i, svalue) | |
3338 | { | |
3339 | if (i > 0) | |
3340 | pp_string (pp, ", "); | |
3341 | print_svalue (svalue_id::from_int (i), pp); | |
3342 | } | |
3343 | ||
3344 | pp_string (pp, "], regions: ["); | |
3345 | ||
3346 | region *region; | |
3347 | FOR_EACH_VEC_ELT (m_regions, i, region) | |
3348 | { | |
3349 | if (i > 0) | |
3350 | pp_string (pp, ", "); | |
3351 | region->print (*this, region_id::from_int (i), pp); | |
3352 | } | |
3353 | ||
3354 | pp_string (pp, "], constraints: "); | |
3355 | ||
3356 | m_constraints->print (pp); | |
3357 | } | |
3358 | ||
3359 | /* Print the svalue with id SID to PP. */ | |
3360 | ||
3361 | void | |
3362 | region_model::print_svalue (svalue_id sid, pretty_printer *pp) const | |
3363 | { | |
3364 | get_svalue (sid)->print (*this, sid, pp); | |
3365 | } | |
3366 | ||
3367 | /* Dump a .dot representation of this region_model to PP, showing | |
3368 | the values and the hierarchy of regions. */ | |
3369 | ||
3370 | void | |
3371 | region_model::dump_dot_to_pp (pretty_printer *pp) const | |
3372 | { | |
3373 | graphviz_out gv (pp); | |
3374 | ||
3375 | pp_string (pp, "digraph \""); | |
3376 | pp_write_text_to_stream (pp); | |
3377 | pp_write_text_as_dot_label_to_stream (pp, /*for_record=*/false); | |
3378 | pp_string (pp, "\" {\n"); | |
3379 | ||
3380 | gv.indent (); | |
3381 | ||
3382 | pp_string (pp, "overlap=false;\n"); | |
3383 | pp_string (pp, "compound=true;\n"); | |
3384 | ||
3385 | int i; | |
3386 | ||
3387 | svalue *svalue; | |
3388 | FOR_EACH_VEC_ELT (m_svalues, i, svalue) | |
3389 | svalue->dump_dot_to_pp (*this, svalue_id::from_int (i), pp); | |
3390 | ||
3391 | region *region; | |
3392 | FOR_EACH_VEC_ELT (m_regions, i, region) | |
3393 | region->dump_dot_to_pp (*this, region_id::from_int (i), pp); | |
3394 | ||
3395 | /* TODO: constraints. */ | |
3396 | ||
3397 | /* Terminate "digraph" */ | |
3398 | gv.outdent (); | |
3399 | pp_string (pp, "}"); | |
3400 | pp_newline (pp); | |
3401 | } | |
3402 | ||
3403 | /* Dump a .dot representation of this region_model to FP. */ | |
3404 | ||
3405 | void | |
3406 | region_model::dump_dot_to_file (FILE *fp) const | |
3407 | { | |
3408 | pretty_printer pp; | |
3409 | pp_format_decoder (&pp) = default_tree_printer; | |
3410 | pp.buffer->stream = fp; | |
3411 | dump_dot_to_pp (&pp); | |
3412 | pp_flush (&pp); | |
3413 | } | |
3414 | ||
3415 | /* Dump a .dot representation of this region_model to PATH. */ | |
3416 | ||
3417 | void | |
3418 | region_model::dump_dot (const char *path) const | |
3419 | { | |
3420 | FILE *fp = fopen (path, "w"); | |
3421 | dump_dot_to_file (fp); | |
3422 | fclose (fp); | |
3423 | } | |
3424 | ||
3425 | /* Dump a multiline representation of this model to PP, showing the | |
3426 | region hierarchy, the svalues, and any constraints. | |
3427 | ||
3428 | If SUMMARIZE is true, show only the most pertient information, | |
3429 | in a form that attempts to be less verbose. | |
3430 | Otherwise, show all information. */ | |
3431 | ||
3432 | void | |
3433 | region_model::dump_to_pp (pretty_printer *pp, bool summarize) const | |
3434 | { | |
3435 | if (summarize) | |
3436 | { | |
3437 | bool is_first = true; | |
3438 | region_id frame_id = get_current_frame_id (); | |
3439 | frame_region *frame = get_region <frame_region> (frame_id); | |
3440 | if (frame) | |
3441 | dump_summary_of_map (pp, frame, &is_first); | |
3442 | ||
3443 | region_id globals_id = get_globals_region_id (); | |
3444 | map_region *globals = get_region <map_region> (globals_id); | |
3445 | if (globals) | |
3446 | dump_summary_of_map (pp, globals, &is_first); | |
3447 | ||
3448 | unsigned i; | |
3449 | ||
3450 | equiv_class *ec; | |
3451 | FOR_EACH_VEC_ELT (m_constraints->m_equiv_classes, i, ec) | |
3452 | { | |
3453 | for (unsigned j = 0; j < ec->m_vars.length (); j++) | |
3454 | { | |
3455 | svalue_id lhs_sid = ec->m_vars[j]; | |
3456 | tree lhs_tree = get_representative_tree (lhs_sid); | |
3457 | if (lhs_tree == NULL_TREE) | |
3458 | continue; | |
3459 | for (unsigned k = j + 1; k < ec->m_vars.length (); k++) | |
3460 | { | |
3461 | svalue_id rhs_sid = ec->m_vars[k]; | |
3462 | tree rhs_tree = get_representative_tree (rhs_sid); | |
3463 | if (rhs_tree | |
3464 | && !(CONSTANT_CLASS_P (lhs_tree) | |
3465 | && CONSTANT_CLASS_P (rhs_tree))) | |
3466 | { | |
3467 | dump_separator (pp, &is_first); | |
3468 | dump_tree (pp, lhs_tree); | |
3469 | pp_string (pp, " == "); | |
3470 | dump_tree (pp, rhs_tree); | |
3471 | } | |
3472 | } | |
3473 | } | |
3474 | } | |
3475 | ||
3476 | constraint *c; | |
3477 | FOR_EACH_VEC_ELT (m_constraints->m_constraints, i, c) | |
3478 | { | |
3479 | const equiv_class &lhs = c->m_lhs.get_obj (*m_constraints); | |
3480 | const equiv_class &rhs = c->m_rhs.get_obj (*m_constraints); | |
3481 | svalue_id lhs_sid = lhs.get_representative (); | |
3482 | svalue_id rhs_sid = rhs.get_representative (); | |
3483 | tree lhs_tree = get_representative_tree (lhs_sid); | |
3484 | tree rhs_tree = get_representative_tree (rhs_sid); | |
3485 | if (lhs_tree && rhs_tree | |
3486 | && !(CONSTANT_CLASS_P (lhs_tree) && CONSTANT_CLASS_P (rhs_tree))) | |
3487 | { | |
3488 | dump_separator (pp, &is_first); | |
3489 | dump_tree (pp, lhs_tree); | |
3490 | pp_printf (pp, " %s ", constraint_op_code (c->m_op)); | |
3491 | dump_tree (pp, rhs_tree); | |
3492 | } | |
3493 | } | |
3494 | ||
3495 | return; | |
3496 | } | |
3497 | ||
3498 | get_region (m_root_rid)->dump_to_pp (*this, m_root_rid, pp, "", true); | |
3499 | ||
3500 | pp_string (pp, "svalues:"); | |
3501 | pp_newline (pp); | |
3502 | int i; | |
3503 | svalue *svalue; | |
3504 | FOR_EACH_VEC_ELT (m_svalues, i, svalue) | |
3505 | { | |
3506 | pp_string (pp, " "); | |
3507 | svalue_id sid = svalue_id::from_int (i); | |
3508 | print_svalue (sid, pp); | |
3509 | pp_newline (pp); | |
3510 | } | |
3511 | ||
3512 | pp_string (pp, "constraint manager:"); | |
3513 | pp_newline (pp); | |
3514 | m_constraints->dump_to_pp (pp); | |
3515 | } | |
3516 | ||
3517 | /* Dump a multiline representation of this model to FILE. */ | |
3518 | ||
3519 | void | |
3520 | region_model::dump (FILE *fp, bool summarize) const | |
3521 | { | |
3522 | pretty_printer pp; | |
3523 | pp_format_decoder (&pp) = default_tree_printer; | |
3524 | pp_show_color (&pp) = pp_show_color (global_dc->printer); | |
3525 | pp.buffer->stream = fp; | |
3526 | dump_to_pp (&pp, summarize); | |
3527 | pp_flush (&pp); | |
3528 | } | |
3529 | ||
3530 | /* Dump a multiline representation of this model to stderr. */ | |
3531 | ||
3532 | DEBUG_FUNCTION void | |
3533 | region_model::dump (bool summarize) const | |
3534 | { | |
3535 | dump (stderr, summarize); | |
3536 | } | |
3537 | ||
3538 | /* Dump RMODEL fully to stderr (i.e. without summarization). */ | |
3539 | ||
3540 | DEBUG_FUNCTION void | |
3541 | region_model::debug () const | |
3542 | { | |
3543 | dump (false); | |
3544 | } | |
3545 | ||
3546 | /* Dump VEC to PP, in the form "{VEC elements}: LABEL". */ | |
3547 | ||
3548 | static void | |
3549 | dump_vec_of_tree (pretty_printer *pp, | |
3550 | bool *is_first, | |
3551 | const auto_vec<tree> &vec, | |
3552 | const char *label) | |
3553 | { | |
3554 | if (vec.length () == 0) | |
3555 | return; | |
3556 | ||
3557 | dump_separator (pp, is_first); | |
3558 | pp_printf (pp, "{"); | |
3559 | unsigned i; | |
3560 | tree key; | |
3561 | FOR_EACH_VEC_ELT (vec, i, key) | |
3562 | { | |
3563 | if (i > 0) | |
3564 | pp_string (pp, ", "); | |
3565 | dump_tree (pp, key); | |
3566 | } | |
3567 | pp_printf (pp, "}: %s", label); | |
3568 | } | |
3569 | ||
3570 | /* Dump *MAP_REGION to PP in compact form, updating *IS_FIRST. | |
3571 | Subroutine of region_model::dump_to_pp for use on stack frames and for | |
3572 | the "globals" region. */ | |
3573 | ||
3574 | void | |
3575 | region_model::dump_summary_of_map (pretty_printer *pp, | |
3576 | map_region *map_region, | |
3577 | bool *is_first) const | |
3578 | { | |
3579 | /* Get the keys, sorted by tree_cmp. In particular, this ought | |
3580 | to alphabetize any decls. */ | |
3581 | auto_vec<tree> keys (map_region->elements ()); | |
3582 | for (map_region::iterator_t iter = map_region->begin (); | |
3583 | iter != map_region->end (); | |
3584 | ++iter) | |
3585 | { | |
3586 | tree key_a = (*iter).first; | |
3587 | keys.quick_push (key_a); | |
3588 | } | |
3589 | keys.qsort (tree_cmp); | |
3590 | ||
3591 | /* Print pointers, constants, and poisoned values that aren't "uninit"; | |
3592 | gather keys for unknown and uninit values. */ | |
3593 | unsigned i; | |
3594 | tree key; | |
3595 | auto_vec<tree> unknown_keys; | |
3596 | auto_vec<tree> uninit_keys; | |
3597 | FOR_EACH_VEC_ELT (keys, i, key) | |
3598 | { | |
3599 | region_id child_rid = *map_region->get (key); | |
3600 | ||
3601 | region *child_region = get_region (child_rid); | |
3602 | if (!child_region) | |
3603 | continue; | |
3604 | svalue_id sid = child_region->get_value_direct (); | |
3605 | if (sid.null_p ()) | |
3606 | continue; | |
3607 | svalue *sval = get_svalue (sid); | |
3608 | switch (sval->get_kind ()) | |
3609 | { | |
3610 | default: | |
3611 | gcc_unreachable (); | |
3612 | case SK_REGION: | |
3613 | { | |
3614 | region_svalue *region_sval = as_a <region_svalue *> (sval); | |
3615 | region_id pointee_rid = region_sval->get_pointee (); | |
3616 | tree pointee = get_representative_path_var (pointee_rid).m_tree; | |
3617 | dump_separator (pp, is_first); | |
3618 | dump_tree (pp, key); | |
3619 | pp_string (pp, ": "); | |
3620 | if (pointee) | |
3621 | { | |
3622 | pp_character (pp, '&'); | |
3623 | dump_tree (pp, pointee); | |
3624 | } | |
3625 | else | |
3626 | pp_string (pp, "NULL"); | |
3627 | } | |
3628 | break; | |
3629 | case SK_CONSTANT: | |
3630 | dump_separator (pp, is_first); | |
3631 | dump_tree (pp, key); | |
3632 | pp_string (pp, ": "); | |
3633 | dump_tree (pp, sval->dyn_cast_constant_svalue ()->get_constant ()); | |
3634 | break; | |
3635 | case SK_UNKNOWN: | |
3636 | unknown_keys.safe_push (key); | |
3637 | break; | |
3638 | case SK_POISONED: | |
3639 | { | |
3640 | poisoned_svalue *poisoned_sval = as_a <poisoned_svalue *> (sval); | |
3641 | enum poison_kind pkind = poisoned_sval->get_poison_kind (); | |
3642 | if (pkind == POISON_KIND_UNINIT) | |
3643 | uninit_keys.safe_push (key); | |
3644 | else | |
3645 | { | |
3646 | dump_separator (pp, is_first); | |
3647 | dump_tree (pp, key); | |
3648 | pp_printf (pp, ": %s", poison_kind_to_str (pkind)); | |
3649 | } | |
3650 | } | |
3651 | break; | |
3652 | case SK_SETJMP: | |
3653 | dump_separator (pp, is_first); | |
3654 | pp_printf (pp, "setjmp: EN: %i", | |
3655 | sval->dyn_cast_setjmp_svalue ()->get_index ()); | |
3656 | break; | |
3657 | } | |
3658 | } | |
3659 | ||
3660 | /* Print unknown and uninitialized values in consolidated form. */ | |
3661 | dump_vec_of_tree (pp, is_first, unknown_keys, "unknown"); | |
3662 | dump_vec_of_tree (pp, is_first, uninit_keys, "uninit"); | |
3663 | } | |
3664 | ||
3665 | /* Assert that this object is valid. */ | |
3666 | ||
3667 | void | |
3668 | region_model::validate () const | |
3669 | { | |
3670 | /* Skip this in a release build. */ | |
3671 | #if !CHECKING_P | |
3672 | return; | |
3673 | #endif | |
3674 | ||
3675 | m_constraints->validate (); | |
3676 | ||
3677 | unsigned i; | |
3678 | region *r; | |
3679 | FOR_EACH_VEC_ELT (m_regions, i, r) | |
3680 | r->validate (this); | |
3681 | ||
3682 | // TODO: anything else? | |
3683 | ||
3684 | /* Verify that the stack region (if any) has an "uninitialized" value. */ | |
3685 | region *stack_region = get_root_region ()->get_stack_region (this); | |
3686 | if (stack_region) | |
3687 | { | |
3688 | svalue_id stack_value_sid = stack_region->get_value_direct (); | |
3689 | svalue *stack_value = get_svalue (stack_value_sid); | |
3690 | gcc_assert (stack_value->get_kind () == SK_POISONED); | |
3691 | poisoned_svalue *subclass = stack_value->dyn_cast_poisoned_svalue (); | |
3692 | gcc_assert (subclass); | |
3693 | gcc_assert (subclass->get_poison_kind () == POISON_KIND_UNINIT); | |
3694 | } | |
3695 | } | |
3696 | ||
3697 | /* Global data for use by svalue_id_cmp_by_constant_svalue. */ | |
3698 | ||
3699 | static region_model *svalue_id_cmp_by_constant_svalue_model = NULL; | |
3700 | ||
3701 | /* Comparator for use by region_model::canonicalize. */ | |
3702 | ||
3703 | static int | |
3704 | svalue_id_cmp_by_constant_svalue (const void *p1, const void *p2) | |
3705 | { | |
3706 | const svalue_id *sid1 = (const svalue_id *)p1; | |
3707 | const svalue_id *sid2 = (const svalue_id *)p2; | |
3708 | gcc_assert (!sid1->null_p ()); | |
3709 | gcc_assert (!sid2->null_p ()); | |
3710 | gcc_assert (svalue_id_cmp_by_constant_svalue_model); | |
3711 | const svalue &sval1 | |
3712 | = *svalue_id_cmp_by_constant_svalue_model->get_svalue (*sid1); | |
3713 | const svalue &sval2 | |
3714 | = *svalue_id_cmp_by_constant_svalue_model->get_svalue (*sid2); | |
3715 | gcc_assert (sval1.get_kind () == SK_CONSTANT); | |
3716 | gcc_assert (sval2.get_kind () == SK_CONSTANT); | |
3717 | ||
3718 | tree cst1 = ((const constant_svalue &)sval1).get_constant (); | |
3719 | tree cst2 = ((const constant_svalue &)sval2).get_constant (); | |
3720 | return tree_cmp (cst1, cst2); | |
3721 | } | |
3722 | ||
3723 | /* Reorder the regions and svalues into a deterministic "canonical" order, | |
3724 | to maximize the chance of equality. | |
3725 | If non-NULL, notify CTXT about the svalue id remapping. */ | |
3726 | ||
3727 | void | |
3728 | region_model::canonicalize (region_model_context *ctxt) | |
3729 | { | |
3730 | /* Walk all regions and values in a deterministic order, visiting | |
3731 | rids and sids, generating a rid and sid map. */ | |
3732 | canonicalization c (*this); | |
3733 | ||
3734 | /* (1): Walk all svalues, putting constants first, sorting the constants | |
3735 | (thus imposing an ordering on any constants that are purely referenced | |
3736 | by constraints). | |
3737 | Ignore other svalues for now. */ | |
3738 | { | |
3739 | unsigned i; | |
3740 | auto_vec<svalue_id> sids; | |
3741 | svalue *sval; | |
3742 | FOR_EACH_VEC_ELT (m_svalues, i, sval) | |
3743 | { | |
3744 | if (sval->get_kind () == SK_CONSTANT) | |
3745 | sids.safe_push (svalue_id::from_int (i)); | |
3746 | } | |
3747 | svalue_id_cmp_by_constant_svalue_model = this; | |
3748 | sids.qsort (svalue_id_cmp_by_constant_svalue); | |
3749 | svalue_id_cmp_by_constant_svalue_model = NULL; | |
3750 | svalue_id *sid; | |
3751 | FOR_EACH_VEC_ELT (sids, i, sid) | |
3752 | c.walk_sid (*sid); | |
3753 | } | |
3754 | ||
3755 | /* (2): Walk all regions (and thus their values) in a deterministic | |
3756 | order. */ | |
3757 | c.walk_rid (m_root_rid); | |
3758 | ||
3759 | /* (3): Ensure we've visited everything, as we don't want to purge | |
3760 | at this stage. Anything we visit for the first time here has | |
3761 | arbitrary order. */ | |
3762 | { | |
3763 | unsigned i; | |
3764 | region *region; | |
3765 | FOR_EACH_VEC_ELT (m_regions, i, region) | |
3766 | c.walk_rid (region_id::from_int (i)); | |
3767 | svalue *sval; | |
3768 | FOR_EACH_VEC_ELT (m_svalues, i, sval) | |
3769 | c.walk_sid (svalue_id::from_int (i)); | |
3770 | } | |
3771 | ||
3772 | /* (4): We now have a reordering of the regions and values. | |
3773 | Apply it. */ | |
3774 | remap_svalue_ids (c.m_sid_map); | |
3775 | remap_region_ids (c.m_rid_map); | |
3776 | if (ctxt) | |
3777 | ctxt->remap_svalue_ids (c.m_sid_map); | |
3778 | ||
3779 | /* (5): Canonicalize the constraint_manager (it has already had its | |
3780 | svalue_ids remapped above). This makes use of the new svalue_id | |
3781 | values, and so must happen last. */ | |
3782 | m_constraints->canonicalize (get_num_svalues ()); | |
3783 | ||
3784 | validate (); | |
3785 | } | |
3786 | ||
3787 | /* Return true if this region_model is in canonical form. */ | |
3788 | ||
3789 | bool | |
3790 | region_model::canonicalized_p () const | |
3791 | { | |
3792 | region_model copy (*this); | |
3793 | copy.canonicalize (NULL); | |
3794 | return *this == copy; | |
3795 | } | |
3796 | ||
3797 | /* A subclass of pending_diagnostic for complaining about uses of | |
3798 | poisoned values. */ | |
3799 | ||
3800 | class poisoned_value_diagnostic | |
3801 | : public pending_diagnostic_subclass<poisoned_value_diagnostic> | |
3802 | { | |
3803 | public: | |
3804 | poisoned_value_diagnostic (tree expr, enum poison_kind pkind) | |
3805 | : m_expr (expr), m_pkind (pkind) | |
3806 | {} | |
3807 | ||
3808 | const char *get_kind () const FINAL OVERRIDE { return "poisoned_value_diagnostic"; } | |
3809 | ||
3810 | bool operator== (const poisoned_value_diagnostic &other) const | |
3811 | { | |
3812 | return m_expr == other.m_expr; | |
3813 | } | |
3814 | ||
3815 | bool emit (rich_location *rich_loc) FINAL OVERRIDE | |
3816 | { | |
3817 | switch (m_pkind) | |
3818 | { | |
3819 | default: | |
3820 | gcc_unreachable (); | |
3821 | case POISON_KIND_UNINIT: | |
3822 | { | |
3823 | diagnostic_metadata m; | |
3824 | m.add_cwe (457); /* "CWE-457: Use of Uninitialized Variable". */ | |
3825 | return warning_at (rich_loc, m, | |
3826 | OPT_Wanalyzer_use_of_uninitialized_value, | |
3827 | "use of uninitialized value %qE", | |
3828 | m_expr); | |
3829 | } | |
3830 | break; | |
3831 | case POISON_KIND_FREED: | |
3832 | { | |
3833 | diagnostic_metadata m; | |
3834 | m.add_cwe (416); /* "CWE-416: Use After Free". */ | |
3835 | return warning_at (rich_loc, m, | |
3836 | OPT_Wanalyzer_use_after_free, | |
3837 | "use after %<free%> of %qE", | |
3838 | m_expr); | |
3839 | } | |
3840 | break; | |
3841 | case POISON_KIND_POPPED_STACK: | |
3842 | { | |
3843 | diagnostic_metadata m; | |
3844 | /* TODO: which CWE? */ | |
3845 | return warning_at (rich_loc, m, | |
3846 | OPT_Wanalyzer_use_of_pointer_in_stale_stack_frame, | |
3847 | "use of pointer %qE within stale stack frame", | |
3848 | m_expr); | |
3849 | } | |
3850 | break; | |
3851 | } | |
3852 | } | |
3853 | ||
3854 | label_text describe_final_event (const evdesc::final_event &ev) FINAL OVERRIDE | |
3855 | { | |
3856 | switch (m_pkind) | |
3857 | { | |
3858 | default: | |
3859 | gcc_unreachable (); | |
3860 | case POISON_KIND_UNINIT: | |
3861 | return ev.formatted_print ("use of uninitialized value %qE here", | |
3862 | m_expr); | |
3863 | case POISON_KIND_FREED: | |
3864 | return ev.formatted_print ("use after %<free%> of %qE here", | |
3865 | m_expr); | |
3866 | case POISON_KIND_POPPED_STACK: | |
3867 | return ev.formatted_print | |
3868 | ("use of pointer %qE within stale stack frame here", | |
3869 | m_expr); | |
3870 | } | |
3871 | } | |
3872 | ||
3873 | private: | |
3874 | tree m_expr; | |
3875 | enum poison_kind m_pkind; | |
3876 | }; | |
3877 | ||
3878 | /* Determine if EXPR is poisoned, and if so, queue a diagnostic to CTXT. */ | |
3879 | ||
3880 | void | |
3881 | region_model::check_for_poison (tree expr, region_model_context *ctxt) | |
3882 | { | |
3883 | if (!ctxt) | |
3884 | return; | |
3885 | ||
3886 | // TODO: this is disabled for now (too many false positives) | |
3887 | return; | |
3888 | ||
3889 | svalue_id expr_sid = get_rvalue (expr, ctxt); | |
3890 | gcc_assert (!expr_sid.null_p ()); | |
3891 | svalue *expr_svalue = get_svalue (expr_sid); | |
3892 | gcc_assert (expr_svalue); | |
3893 | if (const poisoned_svalue *poisoned_sval | |
3894 | = expr_svalue->dyn_cast_poisoned_svalue ()) | |
3895 | { | |
3896 | enum poison_kind pkind = poisoned_sval->get_poison_kind (); | |
3897 | ctxt->warn (new poisoned_value_diagnostic (expr, pkind)); | |
3898 | } | |
3899 | } | |
3900 | ||
3901 | /* Update this model for the ASSIGN stmt, using CTXT to report any | |
3902 | diagnostics. */ | |
3903 | ||
3904 | void | |
3905 | region_model::on_assignment (const gassign *assign, region_model_context *ctxt) | |
3906 | { | |
3907 | tree lhs = gimple_assign_lhs (assign); | |
3908 | tree rhs1 = gimple_assign_rhs1 (assign); | |
3909 | ||
3910 | region_id lhs_rid = get_lvalue (lhs, ctxt); | |
3911 | ||
3912 | /* Check for uses of poisoned values. */ | |
3913 | switch (get_gimple_rhs_class (gimple_expr_code (assign))) | |
3914 | { | |
3915 | case GIMPLE_INVALID_RHS: | |
3916 | gcc_unreachable (); | |
3917 | break; | |
3918 | case GIMPLE_TERNARY_RHS: | |
3919 | check_for_poison (gimple_assign_rhs3 (assign), ctxt); | |
3920 | /* Fallthru */ | |
3921 | case GIMPLE_BINARY_RHS: | |
3922 | check_for_poison (gimple_assign_rhs2 (assign), ctxt); | |
3923 | /* Fallthru */ | |
3924 | case GIMPLE_UNARY_RHS: | |
3925 | case GIMPLE_SINGLE_RHS: | |
3926 | check_for_poison (gimple_assign_rhs1 (assign), ctxt); | |
3927 | } | |
3928 | ||
3929 | if (lhs_rid.null_p ()) | |
3930 | return; | |
3931 | // TODO: issue a warning for this case | |
3932 | ||
3933 | enum tree_code op = gimple_assign_rhs_code (assign); | |
3934 | switch (op) | |
3935 | { | |
3936 | default: | |
3937 | { | |
3938 | if (0) | |
3939 | sorry_at (assign->location, "unhandled assignment op: %qs", | |
3940 | get_tree_code_name (op)); | |
3941 | set_to_new_unknown_value (lhs_rid, TREE_TYPE (lhs), ctxt); | |
3942 | } | |
3943 | break; | |
3944 | ||
3945 | case BIT_FIELD_REF: | |
3946 | { | |
3947 | // TODO | |
3948 | } | |
3949 | break; | |
3950 | ||
3951 | case CONSTRUCTOR: | |
3952 | { | |
3953 | /* e.g. "x ={v} {CLOBBER};" */ | |
3954 | // TODO | |
3955 | } | |
3956 | break; | |
3957 | ||
3958 | case POINTER_PLUS_EXPR: | |
3959 | { | |
3960 | /* e.g. "_1 = a_10(D) + 12;" */ | |
3961 | tree ptr = rhs1; | |
3962 | tree offset = gimple_assign_rhs2 (assign); | |
3963 | ||
3964 | svalue_id ptr_sid = get_rvalue (ptr, ctxt); | |
3965 | svalue_id offset_sid = get_rvalue (offset, ctxt); | |
3966 | region_id element_rid | |
3967 | = get_or_create_pointer_plus_expr (TREE_TYPE (TREE_TYPE (ptr)), | |
3968 | ptr_sid, offset_sid, | |
3969 | ctxt); | |
3970 | svalue_id element_ptr_sid | |
3971 | = get_or_create_ptr_svalue (TREE_TYPE (ptr), element_rid); | |
3972 | set_value (lhs_rid, element_ptr_sid, ctxt); | |
3973 | } | |
3974 | break; | |
3975 | ||
3976 | case POINTER_DIFF_EXPR: | |
3977 | { | |
3978 | /* e.g. "_1 = p_2(D) - q_3(D);". */ | |
3979 | ||
3980 | /* TODO. */ | |
3981 | ||
3982 | set_to_new_unknown_value (lhs_rid, TREE_TYPE (lhs), ctxt); | |
3983 | } | |
3984 | break; | |
3985 | ||
3986 | case ADDR_EXPR: | |
3987 | { | |
3988 | /* LHS = &RHS; */ | |
3989 | svalue_id ptr_sid = get_rvalue (rhs1, ctxt); | |
3990 | set_value (lhs_rid, ptr_sid, ctxt); | |
3991 | } | |
3992 | break; | |
3993 | ||
3994 | case MEM_REF: | |
3995 | { | |
3996 | region_id rhs_rid = get_lvalue (rhs1, ctxt); | |
3997 | svalue_id rhs_sid | |
3998 | = get_region (rhs_rid)->get_value (*this, true, ctxt); | |
3999 | set_value (lhs_rid, rhs_sid, ctxt); | |
4000 | } | |
4001 | break; | |
4002 | ||
4003 | case REAL_CST: | |
4004 | case INTEGER_CST: | |
4005 | case ARRAY_REF: | |
4006 | { | |
4007 | /* LHS = RHS; */ | |
4008 | svalue_id cst_sid = get_rvalue (rhs1, ctxt); | |
4009 | set_value (lhs_rid, cst_sid, ctxt); | |
4010 | } | |
4011 | break; | |
4012 | ||
4013 | case FIX_TRUNC_EXPR: | |
4014 | case FLOAT_EXPR: | |
4015 | case NOP_EXPR: | |
4016 | // cast: TODO | |
4017 | // fall though for now | |
4018 | case SSA_NAME: | |
4019 | case VAR_DECL: | |
4020 | case PARM_DECL: | |
4021 | { | |
4022 | /* LHS = VAR; */ | |
4023 | svalue_id var_sid = get_rvalue (rhs1, ctxt); | |
4024 | set_value (lhs_rid, var_sid, ctxt); | |
4025 | } | |
4026 | break; | |
4027 | ||
4028 | case EQ_EXPR: | |
4029 | case GE_EXPR: | |
4030 | case LE_EXPR: | |
4031 | case NE_EXPR: | |
4032 | case GT_EXPR: | |
4033 | case LT_EXPR: | |
4034 | { | |
4035 | tree rhs2 = gimple_assign_rhs2 (assign); | |
4036 | ||
4037 | // TODO: constraints between svalues | |
4038 | svalue_id rhs1_sid = get_rvalue (rhs1, ctxt); | |
4039 | svalue_id rhs2_sid = get_rvalue (rhs2, ctxt); | |
4040 | ||
4041 | tristate t = eval_condition (rhs1_sid, op, rhs2_sid); | |
4042 | if (t.is_known ()) | |
4043 | set_value (lhs_rid, | |
4044 | get_rvalue (t.is_true () | |
4045 | ? boolean_true_node | |
4046 | : boolean_false_node, | |
4047 | ctxt), | |
4048 | ctxt); | |
4049 | else | |
4050 | set_to_new_unknown_value (lhs_rid, TREE_TYPE (lhs), ctxt); | |
4051 | } | |
4052 | break; | |
4053 | ||
4054 | case NEGATE_EXPR: | |
4055 | case BIT_NOT_EXPR: | |
4056 | { | |
4057 | // TODO: unary ops | |
4058 | ||
4059 | // TODO: constant? | |
4060 | ||
4061 | set_to_new_unknown_value (lhs_rid, TREE_TYPE (lhs), ctxt); | |
4062 | } | |
4063 | break; | |
4064 | ||
4065 | case PLUS_EXPR: | |
4066 | case MINUS_EXPR: | |
4067 | case MULT_EXPR: | |
4068 | case TRUNC_DIV_EXPR: | |
4069 | case TRUNC_MOD_EXPR: | |
4070 | case LSHIFT_EXPR: | |
4071 | case RSHIFT_EXPR: | |
4072 | case BIT_IOR_EXPR: | |
4073 | case BIT_XOR_EXPR: | |
4074 | case BIT_AND_EXPR: | |
4075 | case MIN_EXPR: | |
4076 | case MAX_EXPR: | |
4077 | { | |
4078 | /* Binary ops. */ | |
4079 | tree rhs2 = gimple_assign_rhs2 (assign); | |
4080 | ||
4081 | svalue_id rhs1_sid = get_rvalue (rhs1, ctxt); | |
4082 | svalue_id rhs2_sid = get_rvalue (rhs2, ctxt); | |
4083 | ||
4084 | if (tree rhs1_cst = maybe_get_constant (rhs1_sid)) | |
4085 | if (tree rhs2_cst = maybe_get_constant (rhs2_sid)) | |
4086 | { | |
4087 | tree result = fold_build2 (op, TREE_TYPE (lhs), | |
4088 | rhs1_cst, rhs2_cst); | |
4089 | if (CONSTANT_CLASS_P (result)) | |
4090 | { | |
4091 | svalue_id result_sid | |
4092 | = get_or_create_constant_svalue (result); | |
4093 | set_value (lhs_rid, result_sid, ctxt); | |
4094 | return; | |
4095 | } | |
4096 | } | |
4097 | set_to_new_unknown_value (lhs_rid, TREE_TYPE (lhs), ctxt); | |
4098 | } | |
4099 | break; | |
4100 | ||
4101 | case COMPONENT_REF: | |
4102 | { | |
4103 | /* LHS = op0.op1; */ | |
4104 | region_id child_rid = get_lvalue (rhs1, ctxt); | |
4105 | svalue_id child_sid | |
4106 | = get_region (child_rid)->get_value (*this, true, ctxt); | |
4107 | set_value (lhs_rid, child_sid, ctxt); | |
4108 | } | |
4109 | break; | |
4110 | } | |
4111 | } | |
4112 | ||
4113 | /* Update this model for the CALL stmt, using CTXT to report any | |
4114 | diagnostics - the first half. | |
4115 | ||
4116 | Updates to the region_model that should be made *before* sm-states | |
4117 | are updated are done here; other updates to the region_model are done | |
4118 | in region_model::on_call_post. */ | |
4119 | ||
4120 | void | |
4121 | region_model::on_call_pre (const gcall *call, region_model_context *ctxt) | |
4122 | { | |
4123 | region_id lhs_rid; | |
4124 | tree lhs_type = NULL_TREE; | |
4125 | if (tree lhs = gimple_call_lhs (call)) | |
4126 | { | |
4127 | lhs_rid = get_lvalue (lhs, ctxt); | |
4128 | lhs_type = TREE_TYPE (lhs); | |
4129 | } | |
4130 | ||
4131 | /* Check for uses of poisoned values. | |
4132 | For now, special-case "free", to avoid warning about "use-after-free" | |
4133 | when "double free" would be more precise. */ | |
4134 | if (!is_special_named_call_p (call, "free", 1)) | |
4135 | for (unsigned i = 0; i < gimple_call_num_args (call); i++) | |
4136 | check_for_poison (gimple_call_arg (call, i), ctxt); | |
4137 | ||
4138 | if (tree callee_fndecl = get_fndecl_for_call (call, ctxt)) | |
4139 | { | |
4140 | if (is_named_call_p (callee_fndecl, "malloc", call, 1)) | |
4141 | { | |
4142 | // TODO: capture size as a svalue? | |
4143 | region_id new_rid = add_new_malloc_region (); | |
4144 | if (!lhs_rid.null_p ()) | |
4145 | { | |
4146 | svalue_id ptr_sid | |
4147 | = get_or_create_ptr_svalue (lhs_type, new_rid); | |
4148 | set_value (lhs_rid, ptr_sid, ctxt); | |
4149 | } | |
4150 | return; | |
4151 | } | |
4152 | else if (is_named_call_p (callee_fndecl, "__builtin_alloca", call, 1)) | |
4153 | { | |
4154 | region_id frame_rid = get_current_frame_id (); | |
4155 | region_id new_rid | |
4156 | = add_region (new symbolic_region (frame_rid, false)); | |
4157 | if (!lhs_rid.null_p ()) | |
4158 | { | |
4159 | svalue_id ptr_sid | |
4160 | = get_or_create_ptr_svalue (lhs_type, new_rid); | |
4161 | set_value (lhs_rid, ptr_sid, ctxt); | |
4162 | } | |
4163 | return; | |
4164 | } | |
4165 | else if (is_named_call_p (callee_fndecl, "strlen", call, 1)) | |
4166 | { | |
4167 | region_id buf_rid = deref_rvalue (gimple_call_arg (call, 0), ctxt); | |
4168 | svalue_id buf_sid | |
4169 | = get_region (buf_rid)->get_value (*this, true, ctxt); | |
4170 | if (tree cst_expr = maybe_get_constant (buf_sid)) | |
4171 | { | |
4172 | if (TREE_CODE (cst_expr) == STRING_CST | |
4173 | && !lhs_rid.null_p ()) | |
4174 | { | |
4175 | /* TREE_STRING_LENGTH is sizeof, not strlen. */ | |
4176 | int sizeof_cst = TREE_STRING_LENGTH (cst_expr); | |
4177 | int strlen_cst = sizeof_cst - 1; | |
4178 | tree t_cst = build_int_cst (lhs_type, strlen_cst); | |
4179 | svalue_id result_sid | |
4180 | = get_or_create_constant_svalue (t_cst); | |
4181 | set_value (lhs_rid, result_sid, ctxt); | |
4182 | return; | |
4183 | } | |
4184 | } | |
4185 | /* Otherwise an unknown value. */ | |
4186 | } | |
4187 | else if (is_named_call_p (callee_fndecl, | |
4188 | "__analyzer_dump_num_heap_regions", call, 0)) | |
4189 | { | |
4190 | /* Handle the builtin "__analyzer_dump_num_heap_regions" by emitting | |
4191 | a warning (for use in DejaGnu tests). */ | |
4192 | int num_heap_regions = 0; | |
4193 | region_id heap_rid = get_root_region ()->ensure_heap_region (this); | |
4194 | unsigned i; | |
4195 | region *region; | |
4196 | FOR_EACH_VEC_ELT (m_regions, i, region) | |
4197 | if (region->get_parent () == heap_rid) | |
4198 | num_heap_regions++; | |
4199 | /* Use quotes to ensure the output isn't truncated. */ | |
4200 | warning_at (call->location, 0, | |
4201 | "num heap regions: %qi", num_heap_regions); | |
4202 | } | |
4203 | } | |
4204 | ||
4205 | /* Unrecognized call. */ | |
4206 | ||
4207 | /* Unknown return value. */ | |
4208 | if (!lhs_rid.null_p ()) | |
4209 | set_to_new_unknown_value (lhs_rid, lhs_type, ctxt); | |
4210 | ||
4211 | /* TODO: also, any pointer arguments might have been written through, | |
4212 | or the things they point to (implying a graph traversal, which | |
4213 | presumably we need to do before overwriting the old value). */ | |
4214 | } | |
4215 | ||
4216 | /* Update this model for the CALL stmt, using CTXT to report any | |
4217 | diagnostics - the second half. | |
4218 | ||
4219 | Updates to the region_model that should be made *after* sm-states | |
4220 | are updated are done here; other updates to the region_model are done | |
4221 | in region_model::on_call_pre. */ | |
4222 | ||
4223 | void | |
4224 | region_model::on_call_post (const gcall *call, region_model_context *ctxt) | |
4225 | { | |
4226 | /* Update for "free" here, after sm-handling. | |
4227 | ||
4228 | If the ptr points to an underlying heap region, delete the region, | |
4229 | poisoning pointers to it and regions within it. | |
4230 | ||
4231 | We delay this until after sm-state has been updated so that the | |
4232 | sm-handling can transition all of the various casts of the pointer | |
4233 | to a "freed" state *before* we delete the related region here. | |
4234 | ||
4235 | This has to be done here so that the sm-handling can use the fact | |
4236 | that they point to the same region to establish that they are equal | |
4237 | (in region_model::eval_condition_without_cm), and thus transition | |
4238 | all pointers to the region to the "freed" state together, regardless | |
4239 | of casts. */ | |
4240 | if (tree callee_fndecl = get_fndecl_for_call (call, ctxt)) | |
4241 | if (is_named_call_p (callee_fndecl, "free", call, 1)) | |
4242 | { | |
4243 | tree ptr = gimple_call_arg (call, 0); | |
4244 | svalue_id ptr_sid = get_rvalue (ptr, ctxt); | |
4245 | svalue *ptr_sval = get_svalue (ptr_sid); | |
4246 | if (region_svalue *ptr_to_region_sval | |
4247 | = ptr_sval->dyn_cast_region_svalue ()) | |
4248 | { | |
4249 | /* If the ptr points to an underlying heap region, delete it, | |
4250 | poisoning pointers. */ | |
4251 | region_id pointee_rid = ptr_to_region_sval->get_pointee (); | |
4252 | region_id heap_rid = get_root_region ()->ensure_heap_region (this); | |
4253 | if (!pointee_rid.null_p () | |
4254 | && get_region (pointee_rid)->get_parent () == heap_rid) | |
4255 | { | |
4256 | purge_stats stats; | |
4257 | delete_region_and_descendents (pointee_rid, | |
4258 | POISON_KIND_FREED, | |
4259 | &stats, ctxt->get_logger ()); | |
4260 | purge_unused_svalues (&stats, ctxt); | |
4261 | validate (); | |
4262 | // TODO: do anything with stats? | |
4263 | } | |
4264 | } | |
4265 | return; | |
4266 | } | |
4267 | } | |
4268 | ||
4269 | /* Update this model for the RETURN_STMT, using CTXT to report any | |
4270 | diagnostics. */ | |
4271 | ||
4272 | void | |
4273 | region_model::on_return (const greturn *return_stmt, region_model_context *ctxt) | |
4274 | { | |
4275 | tree callee = get_current_function ()->decl; | |
4276 | tree lhs = DECL_RESULT (callee); | |
4277 | tree rhs = gimple_return_retval (return_stmt); | |
4278 | ||
4279 | if (lhs && rhs) | |
4280 | set_value (get_lvalue (lhs, ctxt), get_rvalue (rhs, ctxt), ctxt); | |
4281 | } | |
4282 | ||
4283 | /* Update this model for a call and return of "setjmp" at CALL within ENODE, | |
4284 | using CTXT to report any diagnostics. | |
4285 | ||
4286 | This is for the initial direct invocation of setjmp (which returns 0), | |
4287 | as opposed to any second return due to longjmp. */ | |
4288 | ||
4289 | void | |
4290 | region_model::on_setjmp (const gcall *call, const exploded_node *enode, | |
4291 | region_model_context *ctxt) | |
4292 | { | |
4293 | region_id buf_rid = deref_rvalue (gimple_call_arg (call, 0), ctxt); | |
4294 | region *buf = get_region (buf_rid); | |
4295 | ||
4296 | /* Create a setjmp_svalue for ENODE and store it in BUF_RID's region. */ | |
4297 | if (buf) | |
4298 | { | |
4299 | svalue *sval = new setjmp_svalue (enode, buf->get_type ()); | |
4300 | svalue_id new_sid = add_svalue (sval); | |
4301 | set_value (buf_rid, new_sid, ctxt); | |
4302 | } | |
4303 | ||
4304 | /* Direct calls to setjmp return 0. */ | |
4305 | if (tree lhs = gimple_call_lhs (call)) | |
4306 | { | |
4307 | tree zero = build_int_cst (TREE_TYPE (lhs), 0); | |
4308 | svalue_id new_sid = get_or_create_constant_svalue (zero); | |
4309 | region_id lhs_rid = get_lvalue (lhs, ctxt); | |
4310 | set_value (lhs_rid, new_sid, ctxt); | |
4311 | } | |
4312 | } | |
4313 | ||
4314 | /* Update this region_model for rewinding from a "longjmp" at LONGJMP_CALL | |
4315 | to a "setjmp" at SETJMP_CALL where the final stack depth should be | |
4316 | SETJMP_STACK_DEPTH. Purge any stack frames, potentially reporting on | |
4317 | leaks to CTXT. */ | |
4318 | ||
4319 | void | |
4320 | region_model::on_longjmp (const gcall *longjmp_call, const gcall *setjmp_call, | |
4321 | int setjmp_stack_depth, | |
4322 | region_model_context *ctxt) | |
4323 | { | |
4324 | /* Evaluate the val, using the frame of the "longjmp". */ | |
4325 | tree fake_retval = gimple_call_arg (longjmp_call, 1); | |
4326 | svalue_id fake_retval_sid = get_rvalue (fake_retval, ctxt); | |
4327 | ||
4328 | /* Pop any frames until we reach the stack depth of the function where | |
4329 | setjmp was called. */ | |
4330 | gcc_assert (get_stack_depth () >= setjmp_stack_depth); | |
4331 | while (get_stack_depth () > setjmp_stack_depth) | |
4332 | { | |
4333 | /* Don't purge unused svalues yet, as we're using fake_retval_sid. */ | |
4334 | pop_frame (false, NULL, ctxt); | |
4335 | } | |
4336 | ||
4337 | gcc_assert (get_stack_depth () == setjmp_stack_depth); | |
4338 | ||
4339 | /* Assign to LHS of "setjmp" in new_state. */ | |
4340 | if (tree lhs = gimple_call_lhs (setjmp_call)) | |
4341 | { | |
4342 | /* Passing 0 as the val to longjmp leads to setjmp returning 1. */ | |
4343 | tree t_zero = build_int_cst (TREE_TYPE (fake_retval), 0); | |
4344 | svalue_id zero_sid = get_or_create_constant_svalue (t_zero); | |
4345 | tristate eq_zero = eval_condition (fake_retval_sid, EQ_EXPR, zero_sid); | |
4346 | /* If we have 0, use 1. */ | |
4347 | if (eq_zero.is_true ()) | |
4348 | { | |
4349 | tree t_one = build_int_cst (TREE_TYPE (fake_retval), 1); | |
4350 | svalue_id one_sid = get_or_create_constant_svalue (t_one); | |
4351 | fake_retval_sid = one_sid; | |
4352 | } | |
4353 | else | |
4354 | { | |
4355 | /* Otherwise note that the value is nonzero. */ | |
4356 | m_constraints->add_constraint (fake_retval_sid, NE_EXPR, zero_sid); | |
4357 | } | |
4358 | ||
4359 | region_id lhs_rid = get_lvalue (lhs, ctxt); | |
4360 | set_value (lhs_rid, fake_retval_sid, ctxt); | |
4361 | } | |
4362 | ||
4363 | /* Now that we've assigned the fake_retval, we can purge the unused | |
4364 | svalues, which could detect leaks. */ | |
4365 | purge_unused_svalues (NULL, ctxt, NULL); | |
4366 | validate (); | |
4367 | } | |
4368 | ||
4369 | /* Update this region_model for a phi stmt of the form | |
4370 | LHS = PHI <...RHS...>. | |
4371 | where RHS is for the appropriate edge. */ | |
4372 | ||
4373 | void | |
4374 | region_model::handle_phi (tree lhs, tree rhs, bool is_back_edge, | |
4375 | region_model_context *ctxt) | |
4376 | { | |
4377 | /* For now, don't bother tracking the .MEM SSA names. */ | |
4378 | if (tree var = SSA_NAME_VAR (lhs)) | |
4379 | if (TREE_CODE (var) == VAR_DECL) | |
4380 | if (VAR_DECL_IS_VIRTUAL_OPERAND (var)) | |
4381 | return; | |
4382 | ||
4383 | svalue_id rhs_sid = get_rvalue (rhs, ctxt); | |
4384 | ||
4385 | if (is_back_edge && get_svalue (rhs_sid)->get_kind () != SK_UNKNOWN) | |
4386 | { | |
4387 | /* If we have a back edge, we probably have a loop. | |
4388 | Use an unknown value, to avoid effectively unrolling the | |
4389 | loop. | |
4390 | To terminate, we need to avoid generating a series of | |
4391 | models with an unbounded monotonically increasing number of | |
4392 | redundant unknown values; hence we need to purge svalues | |
4393 | before inserting the state into the exploded graph, to | |
4394 | collect unused svalues. */ | |
4395 | set_to_new_unknown_value (get_lvalue (lhs, ctxt), TREE_TYPE (lhs), ctxt); | |
4396 | } | |
4397 | else | |
4398 | set_value (get_lvalue (lhs, ctxt), rhs_sid, ctxt); | |
4399 | } | |
4400 | ||
4401 | /* Implementation of region_model::get_lvalue; the latter adds type-checking. | |
4402 | ||
4403 | Get the id of the region for PV within this region_model, | |
4404 | emitting any diagnostics to CTXT. */ | |
4405 | ||
4406 | region_id | |
4407 | region_model::get_lvalue_1 (path_var pv, region_model_context *ctxt) | |
4408 | { | |
4409 | tree expr = pv.m_tree; | |
4410 | ||
4411 | gcc_assert (expr); | |
4412 | ||
4413 | switch (TREE_CODE (expr)) | |
4414 | { | |
4415 | default: | |
4416 | gcc_unreachable (); | |
4417 | ||
4418 | case ARRAY_REF: | |
4419 | { | |
4420 | tree array = TREE_OPERAND (expr, 0); | |
4421 | tree index = TREE_OPERAND (expr, 1); | |
4422 | #if 0 | |
4423 | // TODO: operands 2 and 3, if present: | |
4424 | gcc_assert (TREE_OPERAND (expr, 2) == NULL_TREE); | |
4425 | gcc_assert (TREE_OPERAND (expr, 3) == NULL_TREE); | |
4426 | #endif | |
4427 | ||
4428 | region_id array_rid = get_lvalue (array, ctxt); | |
4429 | svalue_id index_sid = get_rvalue (index, ctxt); | |
4430 | array_region *array_reg = get_region<array_region> (array_rid); | |
4431 | return array_reg->get_element (this, array_rid, index_sid, ctxt); | |
4432 | } | |
4433 | break; | |
4434 | ||
4435 | case MEM_REF: | |
4436 | { | |
4437 | tree ptr = TREE_OPERAND (expr, 0); | |
4438 | tree offset = TREE_OPERAND (expr, 1); | |
4439 | svalue_id ptr_sid = get_rvalue (ptr, ctxt); | |
4440 | svalue_id offset_sid = get_rvalue (offset, ctxt); | |
4441 | return get_or_create_mem_ref (TREE_TYPE (expr), ptr_sid, | |
4442 | offset_sid, ctxt); | |
4443 | } | |
4444 | break; | |
4445 | ||
4446 | case VAR_DECL: | |
4447 | /* Handle globals. */ | |
4448 | if (is_global_var (expr)) | |
4449 | { | |
4450 | region_id globals_rid | |
4451 | = get_root_region ()->ensure_globals_region (this); | |
4452 | map_region *globals = get_region<map_region> (globals_rid); | |
4453 | region_id var_rid = globals->get_or_create (this, globals_rid, expr, | |
4454 | TREE_TYPE (expr)); | |
4455 | return var_rid; | |
4456 | } | |
4457 | ||
4458 | /* Fall through. */ | |
4459 | ||
4460 | case SSA_NAME: | |
4461 | case PARM_DECL: | |
4462 | case RESULT_DECL: | |
4463 | { | |
4464 | gcc_assert (TREE_CODE (expr) == SSA_NAME | |
4465 | || TREE_CODE (expr) == PARM_DECL | |
4466 | || TREE_CODE (expr) == VAR_DECL | |
4467 | || TREE_CODE (expr) == RESULT_DECL); | |
4468 | ||
4469 | int stack_depth = pv.m_stack_depth; | |
4470 | stack_region *stack = get_root_region ()->get_stack_region (this); | |
4471 | gcc_assert (stack); | |
4472 | region_id frame_rid = stack->get_frame_rid (stack_depth); | |
4473 | frame_region *frame = get_region <frame_region> (frame_rid); | |
4474 | gcc_assert (frame); | |
4475 | region_id child_rid = frame->get_or_create (this, frame_rid, expr, | |
4476 | TREE_TYPE (expr)); | |
4477 | return child_rid; | |
4478 | } | |
4479 | ||
4480 | case COMPONENT_REF: | |
4481 | { | |
4482 | /* obj.field */ | |
4483 | tree obj = TREE_OPERAND (expr, 0); | |
4484 | tree field = TREE_OPERAND (expr, 1); | |
4485 | region_id obj_rid = get_lvalue (obj, ctxt); | |
4486 | region_id struct_or_union_rid | |
4487 | = get_or_create_view (obj_rid, TREE_TYPE (obj)); | |
4488 | return get_field_region (struct_or_union_rid, field); | |
4489 | } | |
4490 | break; | |
4491 | ||
4492 | case STRING_CST: | |
4493 | { | |
4494 | tree cst_type = TREE_TYPE (expr); | |
4495 | array_region *cst_region = new array_region (m_root_rid, cst_type); | |
4496 | region_id cst_rid = add_region (cst_region); | |
4497 | svalue_id cst_sid = get_or_create_constant_svalue (expr); | |
4498 | cst_region->set_value (*this, cst_rid, cst_sid, ctxt); | |
4499 | return cst_rid; | |
4500 | } | |
4501 | break; | |
4502 | } | |
4503 | } | |
4504 | ||
4505 | /* Assert that SRC_TYPE can be converted to DST_TYPE as a no-op. */ | |
4506 | ||
4507 | #define ASSERT_COMPAT_TYPES(SRC_TYPE, DST_TYPE) \ | |
4508 | gcc_checking_assert (useless_type_conversion_p ((SRC_TYPE), (DST_TYPE))) | |
4509 | ||
4510 | /* Get the id of the region for PV within this region_model, | |
4511 | emitting any diagnostics to CTXT. */ | |
4512 | ||
4513 | region_id | |
4514 | region_model::get_lvalue (path_var pv, region_model_context *ctxt) | |
4515 | { | |
4516 | if (pv.m_tree == NULL_TREE) | |
4517 | return region_id::null (); | |
4518 | ||
4519 | region_id result_rid = get_lvalue_1 (pv, ctxt); | |
4520 | ASSERT_COMPAT_TYPES (get_region (result_rid)->get_type (), | |
4521 | TREE_TYPE (pv.m_tree)); | |
4522 | return result_rid; | |
4523 | } | |
4524 | ||
4525 | /* Get the region_id for EXPR within this region_model (assuming the most | |
4526 | recent stack frame if it's a local). */ | |
4527 | ||
4528 | region_id | |
4529 | region_model::get_lvalue (tree expr, region_model_context *ctxt) | |
4530 | { | |
4531 | return get_lvalue (path_var (expr, get_stack_depth () - 1), ctxt); | |
4532 | } | |
4533 | ||
4534 | /* Implementation of region_model::get_rvalue; the latter adds type-checking. | |
4535 | ||
4536 | Get the value of PV within this region_model, | |
4537 | emitting any diagnostics to CTXT. */ | |
4538 | ||
4539 | svalue_id | |
4540 | region_model::get_rvalue_1 (path_var pv, region_model_context *ctxt) | |
4541 | { | |
4542 | gcc_assert (pv.m_tree); | |
4543 | ||
4544 | switch (TREE_CODE (pv.m_tree)) | |
4545 | { | |
4546 | default: | |
4547 | { | |
4548 | svalue *unknown_sval = new unknown_svalue (TREE_TYPE (pv.m_tree)); | |
4549 | return add_svalue (unknown_sval); | |
4550 | } | |
4551 | break; | |
4552 | ||
4553 | case ADDR_EXPR: | |
4554 | { | |
4555 | /* "&EXPR". */ | |
4556 | tree expr = pv.m_tree; | |
4557 | tree op0 = TREE_OPERAND (expr, 0); | |
4558 | if (TREE_CODE (op0) == FUNCTION_DECL) | |
4559 | return get_svalue_for_fndecl (TREE_TYPE (expr), op0); | |
4560 | else if (TREE_CODE (op0) == LABEL_DECL) | |
4561 | return get_svalue_for_label (TREE_TYPE (expr), op0); | |
4562 | region_id expr_rid = get_lvalue (op0, ctxt); | |
4563 | return get_or_create_ptr_svalue (TREE_TYPE (expr), expr_rid); | |
4564 | } | |
4565 | break; | |
4566 | ||
4567 | case ARRAY_REF: | |
4568 | { | |
4569 | region_id element_rid = get_lvalue (pv, ctxt); | |
4570 | return get_region (element_rid)->get_value (*this, true, ctxt); | |
4571 | } | |
4572 | ||
4573 | case INTEGER_CST: | |
4574 | case REAL_CST: | |
4575 | case STRING_CST: | |
4576 | return get_or_create_constant_svalue (pv.m_tree); | |
4577 | ||
4578 | case COMPONENT_REF: | |
4579 | case MEM_REF: | |
4580 | case SSA_NAME: | |
4581 | case VAR_DECL: | |
4582 | case PARM_DECL: | |
4583 | case RESULT_DECL: | |
4584 | { | |
4585 | region_id var_rid = get_lvalue (pv, ctxt); | |
4586 | return get_region (var_rid)->get_value (*this, true, ctxt); | |
4587 | } | |
4588 | } | |
4589 | } | |
4590 | ||
4591 | /* Get the value of PV within this region_model, | |
4592 | emitting any diagnostics to CTXT. */ | |
4593 | ||
4594 | svalue_id | |
4595 | region_model::get_rvalue (path_var pv, region_model_context *ctxt) | |
4596 | { | |
4597 | if (pv.m_tree == NULL_TREE) | |
4598 | return svalue_id::null (); | |
4599 | svalue_id result_sid = get_rvalue_1 (pv, ctxt); | |
4600 | ||
4601 | ASSERT_COMPAT_TYPES (get_svalue (result_sid)->get_type (), | |
4602 | TREE_TYPE (pv.m_tree)); | |
4603 | ||
4604 | return result_sid; | |
4605 | } | |
4606 | ||
4607 | /* Get the value of EXPR within this region_model (assuming the most | |
4608 | recent stack frame if it's a local). */ | |
4609 | ||
4610 | svalue_id | |
4611 | region_model::get_rvalue (tree expr, region_model_context *ctxt) | |
4612 | { | |
4613 | return get_rvalue (path_var (expr, get_stack_depth () - 1), ctxt); | |
4614 | } | |
4615 | ||
4616 | /* Return an svalue_id for a pointer to RID of type PTR_TYPE, reusing | |
4617 | existing pointer values if one is available. */ | |
4618 | ||
4619 | svalue_id | |
4620 | region_model::get_or_create_ptr_svalue (tree ptr_type, region_id rid) | |
4621 | { | |
4622 | /* Reuse existing region_svalue, if one of the right type is | |
4623 | available. */ | |
4624 | /* In theory we could stash a svalue_id in "region", but differing | |
4625 | pointer types muddles things. | |
4626 | For now, just do a linear search through all existing svalues. */ | |
4627 | int i; | |
4628 | svalue *svalue; | |
4629 | FOR_EACH_VEC_ELT (m_svalues, i, svalue) | |
4630 | if (region_svalue *ptr_svalue = svalue->dyn_cast_region_svalue ()) | |
4631 | if (ptr_svalue->get_pointee () == rid | |
4632 | && ptr_svalue->get_type () == ptr_type) | |
4633 | return svalue_id::from_int (i); | |
4634 | ||
4635 | return add_svalue (new region_svalue (ptr_type, rid)); | |
4636 | } | |
4637 | ||
4638 | /* Return an svalue_id for a constant_svalue for CST_EXPR, | |
4639 | creating the constant_svalue if necessary. | |
4640 | The constant_svalue instances are reused, based on pointer equality | |
4641 | of trees */ | |
4642 | ||
4643 | svalue_id | |
4644 | region_model::get_or_create_constant_svalue (tree cst_expr) | |
4645 | { | |
4646 | gcc_assert (cst_expr); | |
4647 | ||
4648 | /* Reuse one if it already exists. */ | |
4649 | // TODO: maybe store a map, rather than do linear search? | |
4650 | int i; | |
4651 | svalue *svalue; | |
4652 | FOR_EACH_VEC_ELT (m_svalues, i, svalue) | |
4653 | if (svalue->maybe_get_constant () == cst_expr) | |
4654 | return svalue_id::from_int (i); | |
4655 | ||
4656 | svalue_id cst_sid = add_svalue (new constant_svalue (cst_expr)); | |
4657 | return cst_sid; | |
4658 | } | |
4659 | ||
4660 | /* Return an svalue_id for a region_svalue for FNDECL, | |
4661 | creating the function_region if necessary. */ | |
4662 | ||
4663 | svalue_id | |
4664 | region_model::get_svalue_for_fndecl (tree ptr_type, tree fndecl) | |
4665 | { | |
4666 | gcc_assert (TREE_CODE (fndecl) == FUNCTION_DECL); | |
4667 | region_id function_rid = get_region_for_fndecl (fndecl); | |
4668 | return get_or_create_ptr_svalue (ptr_type, function_rid); | |
4669 | } | |
4670 | ||
4671 | /* Return a region_id for a function_region for FNDECL, | |
4672 | creating it if necessary. */ | |
4673 | ||
4674 | region_id | |
4675 | region_model::get_region_for_fndecl (tree fndecl) | |
4676 | { | |
4677 | gcc_assert (TREE_CODE (fndecl) == FUNCTION_DECL); | |
4678 | ||
4679 | region_id code_rid = get_root_region ()->ensure_code_region (this); | |
4680 | code_region *code = get_root_region ()->get_code_region (this); | |
4681 | ||
4682 | return code->get_or_create (this, code_rid, fndecl, TREE_TYPE (fndecl)); | |
4683 | } | |
4684 | ||
4685 | /* Return an svalue_id for a region_svalue for LABEL, | |
4686 | creating the label_region if necessary. */ | |
4687 | ||
4688 | svalue_id | |
4689 | region_model::get_svalue_for_label (tree ptr_type, tree label) | |
4690 | { | |
4691 | gcc_assert (TREE_CODE (label) == LABEL_DECL); | |
4692 | region_id label_rid = get_region_for_label (label); | |
4693 | return get_or_create_ptr_svalue (ptr_type, label_rid); | |
4694 | } | |
4695 | ||
4696 | /* Return a region_id for a label_region for LABEL, | |
4697 | creating it if necessary. */ | |
4698 | ||
4699 | region_id | |
4700 | region_model::get_region_for_label (tree label) | |
4701 | { | |
4702 | gcc_assert (TREE_CODE (label) == LABEL_DECL); | |
4703 | ||
4704 | tree fndecl = DECL_CONTEXT (label); | |
4705 | gcc_assert (fndecl && TREE_CODE (fndecl) == FUNCTION_DECL); | |
4706 | ||
4707 | region_id func_rid = get_region_for_fndecl (fndecl); | |
4708 | function_region *func_reg = get_region <function_region> (func_rid); | |
4709 | return func_reg->get_or_create (this, func_rid, label, TREE_TYPE (label)); | |
4710 | } | |
4711 | ||
4712 | /* Build a cast of SRC_EXPR to DST_TYPE, or return NULL_TREE. | |
4713 | ||
4714 | Adapted from gcc::jit::playback::context::build_cast, which in turn is | |
4715 | adapted from | |
4716 | - c/c-typeck.c:build_c_cast | |
4717 | - c/c-convert.c: convert | |
4718 | - convert.h | |
4719 | Only some kinds of cast are currently supported here. */ | |
4720 | ||
4721 | static tree | |
4722 | build_cast (tree dst_type, tree src_expr) | |
4723 | { | |
4724 | tree result = targetm.convert_to_type (dst_type, src_expr); | |
4725 | if (result) | |
4726 | return result; | |
4727 | enum tree_code dst_code = TREE_CODE (dst_type); | |
4728 | switch (dst_code) | |
4729 | { | |
4730 | case INTEGER_TYPE: | |
4731 | case ENUMERAL_TYPE: | |
4732 | result = convert_to_integer (dst_type, src_expr); | |
4733 | goto maybe_fold; | |
4734 | ||
4735 | case BOOLEAN_TYPE: | |
4736 | /* Compare with c_objc_common_truthvalue_conversion and | |
4737 | c_common_truthvalue_conversion. */ | |
4738 | /* For now, convert to: (src_expr != 0) */ | |
4739 | result = build2 (NE_EXPR, dst_type, | |
4740 | src_expr, | |
4741 | build_int_cst (TREE_TYPE (src_expr), 0)); | |
4742 | goto maybe_fold; | |
4743 | ||
4744 | case REAL_TYPE: | |
4745 | result = convert_to_real (dst_type, src_expr); | |
4746 | goto maybe_fold; | |
4747 | ||
4748 | case POINTER_TYPE: | |
4749 | result = build1 (NOP_EXPR, dst_type, src_expr); | |
4750 | goto maybe_fold; | |
4751 | ||
4752 | default: | |
4753 | return NULL_TREE; | |
4754 | ||
4755 | maybe_fold: | |
4756 | if (TREE_CODE (result) != C_MAYBE_CONST_EXPR) | |
4757 | result = fold (result); | |
4758 | return result; | |
4759 | } | |
4760 | } | |
4761 | ||
4762 | /* If the type of SID's underlying value is DST_TYPE, return SID. | |
4763 | Otherwise, attempt to create (or reuse) an svalue representing an access | |
4764 | of SID as a DST_TYPE and return that value's svalue_id. */ | |
4765 | ||
4766 | svalue_id | |
4767 | region_model::maybe_cast_1 (tree dst_type, svalue_id sid) | |
4768 | { | |
4769 | svalue *sval = get_svalue (sid); | |
4770 | tree src_type = sval->get_type (); | |
4771 | if (src_type == dst_type) | |
4772 | return sid; | |
4773 | ||
4774 | if (POINTER_TYPE_P (dst_type) | |
4775 | && POINTER_TYPE_P (src_type)) | |
4776 | { | |
4777 | /* Pointer to region. */ | |
4778 | if (region_svalue *ptr_sval = sval->dyn_cast_region_svalue ()) | |
4779 | return get_or_create_ptr_svalue (dst_type, ptr_sval->get_pointee ()); | |
4780 | ||
4781 | /* Unknown pointer? Get or create a new unknown pointer of the | |
4782 | correct type, preserving the equality between the pointers. */ | |
4783 | if (sval->dyn_cast_unknown_svalue ()) | |
4784 | { | |
4785 | equiv_class &ec = m_constraints->get_equiv_class (sid); | |
4786 | ||
4787 | /* Look for an existing pointer of the correct type within the EC. */ | |
4788 | int i; | |
4789 | svalue_id *equiv_sid; | |
4790 | FOR_EACH_VEC_ELT (ec.m_vars, i, equiv_sid) | |
4791 | { | |
4792 | svalue *equiv_val = get_svalue (*equiv_sid); | |
4793 | if (equiv_val->get_type () == dst_type) | |
4794 | return *equiv_sid; | |
4795 | } | |
4796 | ||
4797 | /* Otherwise, create a new unknown pointer of the correct type. */ | |
4798 | svalue *unknown_sval = new unknown_svalue (dst_type); | |
4799 | svalue_id new_ptr_sid = add_svalue (unknown_sval); | |
4800 | m_constraints->add_constraint (sid, EQ_EXPR, new_ptr_sid); | |
4801 | return new_ptr_sid; | |
4802 | } | |
4803 | } | |
4804 | ||
4805 | /* Attempt to cast constants. */ | |
4806 | if (tree src_cst = sval->maybe_get_constant ()) | |
4807 | { | |
4808 | tree dst = build_cast (dst_type, src_cst); | |
4809 | gcc_assert (dst != NULL_TREE); | |
4810 | if (CONSTANT_CLASS_P (dst)) | |
4811 | return get_or_create_constant_svalue (dst); | |
4812 | } | |
4813 | ||
4814 | /* Otherwise, return a new unknown value. */ | |
4815 | svalue *unknown_sval = new unknown_svalue (dst_type); | |
4816 | return add_svalue (unknown_sval); | |
4817 | } | |
4818 | ||
4819 | /* If the type of SID's underlying value is DST_TYPE, return SID. | |
4820 | Otherwise, attempt to create (or reuse) an svalue representing an access | |
4821 | of SID as a DST_TYPE and return that value's svalue_id. | |
4822 | ||
4823 | If the result != SID, then call CTXT's on_cast vfunc (if CTXT is non-NULL), | |
4824 | so that sm-state can be propagated from SID to the result. */ | |
4825 | ||
4826 | svalue_id | |
4827 | region_model::maybe_cast (tree dst_type, svalue_id sid, | |
4828 | region_model_context *ctxt) | |
4829 | { | |
4830 | svalue_id result = maybe_cast_1 (dst_type, sid); | |
4831 | if (result != sid) | |
4832 | if (ctxt) | |
4833 | { | |
4834 | /* Notify ctxt about a cast, so any sm-state can be copied. */ | |
4835 | ctxt->on_cast (sid, result); | |
4836 | } | |
4837 | return result; | |
4838 | } | |
4839 | ||
4840 | /* Ensure that the region for OBJ_RID has a child region for FIELD; | |
4841 | return the child region's region_id. */ | |
4842 | ||
4843 | region_id | |
4844 | region_model::get_field_region (region_id struct_or_union_rid, tree field) | |
4845 | { | |
4846 | struct_or_union_region *sou_reg | |
4847 | = get_region<struct_or_union_region> (struct_or_union_rid); | |
4848 | ||
4849 | /* Inherit constness from parent type. */ | |
4850 | const int qual_mask = TYPE_QUAL_CONST; | |
4851 | int sou_quals = TYPE_QUALS (sou_reg->get_type ()) & qual_mask; | |
4852 | tree field_type = TREE_TYPE (field); | |
4853 | tree field_type_with_quals = build_qualified_type (field_type, sou_quals); | |
4854 | ||
4855 | // TODO: maybe convert to a vfunc? | |
4856 | if (sou_reg->get_kind () == RK_UNION) | |
4857 | { | |
4858 | /* Union. | |
4859 | Get a view of the union as a whole, with the type of the field. */ | |
4860 | region_id view_rid | |
4861 | = get_or_create_view (struct_or_union_rid, field_type_with_quals); | |
4862 | return view_rid; | |
4863 | } | |
4864 | else | |
4865 | { | |
4866 | /* Struct. */ | |
4867 | region_id child_rid | |
4868 | = sou_reg->get_or_create (this, struct_or_union_rid, field, | |
4869 | field_type_with_quals); | |
4870 | return child_rid; | |
4871 | } | |
4872 | } | |
4873 | ||
4874 | /* Get a region_id for referencing PTR_SID, creating a region if need be, and | |
4875 | potentially generating warnings via CTXT. */ | |
4876 | ||
4877 | region_id | |
4878 | region_model::deref_rvalue (svalue_id ptr_sid, region_model_context *ctxt) | |
4879 | { | |
4880 | gcc_assert (!ptr_sid.null_p ()); | |
4881 | svalue *ptr_svalue = get_svalue (ptr_sid); | |
4882 | gcc_assert (ptr_svalue); | |
4883 | ||
4884 | switch (ptr_svalue->get_kind ()) | |
4885 | { | |
4886 | case SK_REGION: | |
4887 | { | |
4888 | region_svalue *region_sval = as_a <region_svalue *> (ptr_svalue); | |
4889 | return region_sval->get_pointee (); | |
4890 | } | |
4891 | ||
4892 | case SK_CONSTANT: | |
4893 | goto create_symbolic_region; | |
4894 | ||
4895 | case SK_POISONED: | |
4896 | { | |
4897 | if (ctxt) | |
4898 | if (tree ptr = get_representative_tree (ptr_sid)) | |
4899 | { | |
4900 | poisoned_svalue *poisoned_sval | |
4901 | = as_a <poisoned_svalue *> (ptr_svalue); | |
4902 | enum poison_kind pkind = poisoned_sval->get_poison_kind (); | |
4903 | ctxt->warn (new poisoned_value_diagnostic (ptr, pkind)); | |
4904 | } | |
4905 | goto create_symbolic_region; | |
4906 | } | |
4907 | ||
4908 | case SK_UNKNOWN: | |
4909 | { | |
4910 | create_symbolic_region: | |
4911 | /* We need a symbolic_region to represent this unknown region. | |
4912 | We don't know if it on the heap, stack, or a global, | |
4913 | so use the root region as parent. */ | |
4914 | region_id new_rid | |
4915 | = add_region (new symbolic_region (m_root_rid, false)); | |
4916 | ||
4917 | /* We need to write the region back into the pointer, | |
4918 | or we'll get a new, different region each time. | |
4919 | We do this by changing the meaning of ptr_sid, replacing | |
4920 | the unknown value with the ptr to the new region. | |
4921 | We replace the meaning of the ID rather than simply writing | |
4922 | to PTR's lvalue since there could be several places sharing | |
4923 | the same unknown ptr value. */ | |
4924 | svalue *ptr_val | |
4925 | = new region_svalue (ptr_svalue->get_type (), new_rid); | |
4926 | replace_svalue (ptr_sid, ptr_val); | |
4927 | ||
4928 | return new_rid; | |
4929 | } | |
4930 | ||
4931 | case SK_SETJMP: | |
4932 | goto create_symbolic_region; | |
4933 | } | |
4934 | ||
4935 | gcc_unreachable (); | |
4936 | } | |
4937 | ||
4938 | /* Get a region_id for referencing PTR, creating a region if need be, and | |
4939 | potentially generating warnings via CTXT. */ | |
4940 | ||
4941 | region_id | |
4942 | region_model::deref_rvalue (tree ptr, region_model_context *ctxt) | |
4943 | { | |
4944 | svalue_id ptr_sid = get_rvalue (ptr, ctxt); | |
4945 | return deref_rvalue (ptr_sid, ctxt); | |
4946 | } | |
4947 | ||
4948 | /* Set the value of the region given by LHS_RID to the value given | |
4949 | by RHS_SID. */ | |
4950 | ||
4951 | void | |
4952 | region_model::set_value (region_id lhs_rid, svalue_id rhs_sid, | |
4953 | region_model_context *ctxt) | |
4954 | { | |
4955 | gcc_assert (!lhs_rid.null_p ()); | |
4956 | gcc_assert (!rhs_sid.null_p ()); | |
4957 | get_region (lhs_rid)->set_value (*this, lhs_rid, rhs_sid, ctxt); | |
4958 | } | |
4959 | ||
4960 | /* Determine what is known about the condition "LHS_SID OP RHS_SID" within | |
4961 | this model. */ | |
4962 | ||
4963 | tristate | |
4964 | region_model::eval_condition (svalue_id lhs_sid, | |
4965 | enum tree_code op, | |
4966 | svalue_id rhs_sid) const | |
4967 | { | |
4968 | tristate ts = eval_condition_without_cm (lhs_sid, op, rhs_sid); | |
4969 | ||
4970 | if (ts.is_known ()) | |
4971 | return ts; | |
4972 | ||
4973 | /* Otherwise, try constraints. */ | |
4974 | return m_constraints->eval_condition (lhs_sid, op, rhs_sid); | |
4975 | } | |
4976 | ||
4977 | /* Determine what is known about the condition "LHS_SID OP RHS_SID" within | |
4978 | this model, without resorting to the constraint_manager. | |
4979 | ||
4980 | This is exposed so that impl_region_model_context::on_state_leak can | |
4981 | check for equality part-way through region_model::purge_unused_svalues | |
4982 | without risking creating new ECs. */ | |
4983 | ||
4984 | tristate | |
4985 | region_model::eval_condition_without_cm (svalue_id lhs_sid, | |
4986 | enum tree_code op, | |
4987 | svalue_id rhs_sid) const | |
4988 | { | |
4989 | svalue *lhs = get_svalue (lhs_sid); | |
4990 | svalue *rhs = get_svalue (rhs_sid); | |
4991 | gcc_assert (lhs); | |
4992 | gcc_assert (rhs); | |
4993 | ||
4994 | /* See what we know based on the values. */ | |
4995 | if (lhs && rhs) | |
4996 | { | |
4997 | if (lhs == rhs) | |
4998 | { | |
4999 | /* If we have the same svalue, then we have equality. | |
5000 | TODO: should this definitely be the case for poisoned values? */ | |
5001 | switch (op) | |
5002 | { | |
5003 | default: | |
5004 | gcc_unreachable (); | |
5005 | ||
5006 | case EQ_EXPR: | |
5007 | case GE_EXPR: | |
5008 | case LE_EXPR: | |
5009 | return tristate::TS_TRUE; | |
5010 | ||
5011 | case NE_EXPR: | |
5012 | case GT_EXPR: | |
5013 | case LT_EXPR: | |
5014 | return tristate::TS_FALSE; | |
5015 | } | |
5016 | } | |
5017 | ||
5018 | /* If we have a pair of region_svalues, compare them. */ | |
5019 | if (region_svalue *lhs_ptr = lhs->dyn_cast_region_svalue ()) | |
5020 | if (region_svalue *rhs_ptr = rhs->dyn_cast_region_svalue ()) | |
5021 | { | |
5022 | tristate res = region_svalue::eval_condition (lhs_ptr, op, rhs_ptr); | |
5023 | if (res.is_known ()) | |
5024 | return res; | |
5025 | /* Otherwise, only known through constraints. */ | |
5026 | } | |
5027 | ||
5028 | /* If we have a pair of constants, compare them. */ | |
5029 | if (constant_svalue *cst_lhs = lhs->dyn_cast_constant_svalue ()) | |
5030 | if (constant_svalue *cst_rhs = rhs->dyn_cast_constant_svalue ()) | |
5031 | return constant_svalue::eval_condition (cst_lhs, op, cst_rhs); | |
5032 | ||
5033 | /* Handle comparison of a region_svalue against zero. */ | |
5034 | if (region_svalue *ptr = lhs->dyn_cast_region_svalue ()) | |
5035 | if (constant_svalue *cst_rhs = rhs->dyn_cast_constant_svalue ()) | |
5036 | if (zerop (cst_rhs->get_constant ())) | |
5037 | { | |
5038 | /* A region_svalue is a non-NULL pointer, except in certain | |
5039 | special cases (see the comment for region::non_null_p. */ | |
5040 | region *pointee = get_region (ptr->get_pointee ()); | |
5041 | if (pointee->non_null_p (*this)) | |
5042 | { | |
5043 | switch (op) | |
5044 | { | |
5045 | default: | |
5046 | gcc_unreachable (); | |
5047 | ||
5048 | case EQ_EXPR: | |
5049 | case GE_EXPR: | |
5050 | case LE_EXPR: | |
5051 | return tristate::TS_FALSE; | |
5052 | ||
5053 | case NE_EXPR: | |
5054 | case GT_EXPR: | |
5055 | case LT_EXPR: | |
5056 | return tristate::TS_TRUE; | |
5057 | } | |
5058 | } | |
5059 | } | |
5060 | } | |
5061 | ||
5062 | return tristate::TS_UNKNOWN; | |
5063 | } | |
5064 | ||
5065 | /* Attempt to add the constraint "LHS OP RHS" to this region_model. | |
5066 | If it is consistent with existing constraints, add it, and return true. | |
5067 | Return false if it contradicts existing constraints. | |
5068 | Use CTXT for reporting any diagnostics associated with the accesses. */ | |
5069 | ||
5070 | bool | |
5071 | region_model::add_constraint (tree lhs, enum tree_code op, tree rhs, | |
5072 | region_model_context *ctxt) | |
5073 | { | |
5074 | svalue_id lhs_sid = get_rvalue (lhs, ctxt); | |
5075 | svalue_id rhs_sid = get_rvalue (rhs, ctxt); | |
5076 | ||
5077 | tristate t_cond = eval_condition (lhs_sid, op, rhs_sid); | |
5078 | ||
5079 | /* If we already have the condition, do nothing. */ | |
5080 | if (t_cond.is_true ()) | |
5081 | return true; | |
5082 | ||
5083 | /* Reject a constraint that would contradict existing knowledge, as | |
5084 | unsatisfiable. */ | |
5085 | if (t_cond.is_false ()) | |
5086 | return false; | |
5087 | ||
5088 | /* Store the constraint. */ | |
5089 | m_constraints->add_constraint (lhs_sid, op, rhs_sid); | |
5090 | ||
5091 | add_any_constraints_from_ssa_def_stmt (lhs, op, rhs, ctxt); | |
5092 | ||
5093 | /* Notify the context, if any. This exists so that the state machines | |
5094 | in a program_state can be notified about the condition, and so can | |
5095 | set sm-state for e.g. unchecked->checked, both for cfg-edges, and | |
5096 | when synthesizing constraints as above. */ | |
5097 | if (ctxt) | |
5098 | ctxt->on_condition (lhs, op, rhs); | |
5099 | ||
5100 | return true; | |
5101 | } | |
5102 | ||
5103 | /* Subroutine of region_model::add_constraint for handling optimized | |
5104 | && and || conditionals. | |
5105 | ||
5106 | If we have an SSA_NAME for a boolean compared against 0, | |
5107 | look at anything implied by the def stmt and call add_constraint | |
5108 | for it (which could recurse). | |
5109 | ||
5110 | For example, if we have | |
5111 | _1 = p_6 == 0B; | |
5112 | _2 = p_8 == 0B | |
5113 | _3 = _1 | _2 | |
5114 | and add the constraint | |
5115 | (_3 == 0), | |
5116 | then the def stmt for _3 implies that _1 and _2 are both false, | |
5117 | and hence we can add the constraints: | |
5118 | p_6 != 0B | |
5119 | p_8 != 0B. */ | |
5120 | ||
5121 | void | |
5122 | region_model::add_any_constraints_from_ssa_def_stmt (tree lhs, | |
5123 | enum tree_code op, | |
5124 | tree rhs, | |
5125 | region_model_context *ctxt) | |
5126 | { | |
5127 | if (TREE_CODE (lhs) != SSA_NAME) | |
5128 | return; | |
5129 | ||
5130 | if (rhs != boolean_false_node) | |
5131 | return; | |
5132 | ||
5133 | if (op != NE_EXPR && op != EQ_EXPR) | |
5134 | return; | |
5135 | ||
5136 | /* We have either | |
5137 | - "LHS != false" (i.e. LHS is true), or | |
5138 | - "LHS == false" (i.e. LHS is false). */ | |
5139 | bool is_true = op == NE_EXPR; | |
5140 | ||
5141 | gimple *def_stmt = SSA_NAME_DEF_STMT (lhs); | |
5142 | gassign *assign = dyn_cast<gassign *> (def_stmt); | |
5143 | if (!assign) | |
5144 | return; | |
5145 | ||
5146 | enum tree_code rhs_code = gimple_assign_rhs_code (assign); | |
5147 | ||
5148 | switch (rhs_code) | |
5149 | { | |
5150 | default: | |
5151 | break; | |
5152 | case BIT_AND_EXPR: | |
5153 | { | |
5154 | if (is_true) | |
5155 | { | |
5156 | /* ...and "LHS == (rhs1 & rhs2) i.e. "(rhs1 & rhs2)" is true | |
5157 | then both rhs1 and rhs2 must be true. */ | |
5158 | tree rhs1 = gimple_assign_rhs1 (assign); | |
5159 | tree rhs2 = gimple_assign_rhs2 (assign); | |
5160 | add_constraint (rhs1, NE_EXPR, boolean_false_node, ctxt); | |
5161 | add_constraint (rhs2, NE_EXPR, boolean_false_node, ctxt); | |
5162 | } | |
5163 | } | |
5164 | break; | |
5165 | ||
5166 | case BIT_IOR_EXPR: | |
5167 | { | |
5168 | if (!is_true) | |
5169 | { | |
5170 | /* ...and "LHS == (rhs1 | rhs2) | |
5171 | i.e. "(rhs1 | rhs2)" is false | |
5172 | then both rhs1 and rhs2 must be false. */ | |
5173 | tree rhs1 = gimple_assign_rhs1 (assign); | |
5174 | tree rhs2 = gimple_assign_rhs2 (assign); | |
5175 | add_constraint (rhs1, EQ_EXPR, boolean_false_node, ctxt); | |
5176 | add_constraint (rhs2, EQ_EXPR, boolean_false_node, ctxt); | |
5177 | } | |
5178 | } | |
5179 | break; | |
5180 | ||
5181 | case EQ_EXPR: | |
5182 | case NE_EXPR: | |
5183 | { | |
5184 | /* ...and "LHS == (rhs1 OP rhs2)" | |
5185 | then rhs1 OP rhs2 must have the same logical value as LHS. */ | |
5186 | tree rhs1 = gimple_assign_rhs1 (assign); | |
5187 | tree rhs2 = gimple_assign_rhs2 (assign); | |
5188 | if (!is_true) | |
5189 | rhs_code | |
5190 | = invert_tree_comparison (rhs_code, false /* honor_nans */); | |
5191 | add_constraint (rhs1, rhs_code, rhs2, ctxt); | |
5192 | } | |
5193 | break; | |
5194 | } | |
5195 | } | |
5196 | ||
5197 | /* Determine what is known about the condition "LHS OP RHS" within | |
5198 | this model. | |
5199 | Use CTXT for reporting any diagnostics associated with the accesses. */ | |
5200 | ||
5201 | tristate | |
5202 | region_model::eval_condition (tree lhs, | |
5203 | enum tree_code op, | |
5204 | tree rhs, | |
5205 | region_model_context *ctxt) | |
5206 | { | |
5207 | return eval_condition (get_rvalue (lhs, ctxt), op, get_rvalue (rhs, ctxt)); | |
5208 | } | |
5209 | ||
5210 | /* If SID is a constant value, return the underlying tree constant. | |
5211 | Otherwise, return NULL_TREE. */ | |
5212 | ||
5213 | tree | |
5214 | region_model::maybe_get_constant (svalue_id sid) const | |
5215 | { | |
5216 | gcc_assert (!sid.null_p ()); | |
5217 | svalue *sval = get_svalue (sid); | |
5218 | return sval->maybe_get_constant (); | |
5219 | } | |
5220 | ||
5221 | /* Create a new child region of the heap (creating the heap region if | |
5222 | necessary). | |
5223 | Return the region_id of the new child region. */ | |
5224 | ||
5225 | region_id | |
5226 | region_model::add_new_malloc_region () | |
5227 | { | |
5228 | region_id heap_rid | |
5229 | = get_root_region ()->ensure_heap_region (this); | |
5230 | return add_region (new symbolic_region (heap_rid, true)); | |
5231 | } | |
5232 | ||
5233 | /* Attempt to return a tree that represents SID, or return NULL_TREE. | |
5234 | Find the first region that stores the value (e.g. a local) and | |
5235 | generate a representative tree for it. */ | |
5236 | ||
5237 | tree | |
5238 | region_model::get_representative_tree (svalue_id sid) const | |
5239 | { | |
5240 | if (sid.null_p ()) | |
5241 | return NULL_TREE; | |
5242 | ||
5243 | unsigned i; | |
5244 | region *region; | |
5245 | FOR_EACH_VEC_ELT (m_regions, i, region) | |
5246 | if (sid == region->get_value_direct ()) | |
5247 | { | |
5248 | path_var pv = get_representative_path_var (region_id::from_int (i)); | |
5249 | if (pv.m_tree) | |
5250 | return pv.m_tree; | |
5251 | } | |
5252 | ||
5253 | return maybe_get_constant (sid); | |
5254 | } | |
5255 | ||
5256 | /* Attempt to return a path_var that represents the region, or return | |
5257 | the NULL path_var. | |
5258 | For example, a region for a field of a local would be a path_var | |
5259 | wrapping a COMPONENT_REF. */ | |
5260 | ||
5261 | path_var | |
5262 | region_model::get_representative_path_var (region_id rid) const | |
5263 | { | |
5264 | region *reg = get_region (rid); | |
5265 | region *parent_region = get_region (reg->get_parent ()); | |
5266 | region_id stack_rid = get_stack_region_id (); | |
5267 | if (!stack_rid.null_p ()) | |
5268 | if (parent_region->get_parent () == stack_rid) | |
5269 | { | |
5270 | frame_region *parent_frame = (frame_region *)parent_region; | |
5271 | tree t = parent_frame->get_tree_for_child_region (rid); | |
5272 | return path_var (t, parent_frame->get_depth ()); | |
5273 | } | |
5274 | if (reg->get_parent () == get_globals_region_id ()) | |
5275 | { | |
5276 | map_region *globals = get_root_region ()->get_globals_region (this); | |
5277 | if (globals) | |
5278 | return path_var (globals->get_tree_for_child_region (rid), -1); | |
5279 | } | |
5280 | ||
5281 | /* Handle e.g. fields of a local by recursing. */ | |
5282 | region_id parent_rid = reg->get_parent (); | |
5283 | region *parent_reg = get_region (parent_rid); | |
5284 | if (parent_reg) | |
5285 | { | |
5286 | if (parent_reg->get_kind () == RK_STRUCT) | |
5287 | { | |
5288 | map_region *parent_map_region = (map_region *)parent_reg; | |
5289 | /* This can fail if we have a view, rather than a field. */ | |
5290 | if (tree child_key | |
5291 | = parent_map_region->get_tree_for_child_region (rid)) | |
5292 | { | |
5293 | path_var parent_pv = get_representative_path_var (parent_rid); | |
5294 | if (parent_pv.m_tree && TREE_CODE (child_key) == FIELD_DECL) | |
5295 | return path_var (build3 (COMPONENT_REF, | |
5296 | TREE_TYPE (child_key), | |
5297 | parent_pv.m_tree, child_key, | |
5298 | NULL_TREE), | |
5299 | parent_pv.m_stack_depth); | |
5300 | } | |
5301 | } | |
5302 | } | |
5303 | ||
5304 | return path_var (NULL_TREE, 0); | |
5305 | } | |
5306 | ||
5307 | /* Locate all regions that directly have value SID and append representative | |
5308 | path_var instances for them into *OUT. */ | |
5309 | ||
5310 | void | |
5311 | region_model::get_path_vars_for_svalue (svalue_id sid, vec<path_var> *out) const | |
5312 | { | |
5313 | unsigned i; | |
5314 | region *region; | |
5315 | FOR_EACH_VEC_ELT (m_regions, i, region) | |
5316 | if (sid == region->get_value_direct ()) | |
5317 | { | |
5318 | path_var pv = get_representative_path_var (region_id::from_int (i)); | |
5319 | if (pv.m_tree) | |
5320 | out->safe_push (pv); | |
5321 | } | |
5322 | } | |
5323 | ||
5324 | /* Set DST_RID value to be a new unknown value of type TYPE. */ | |
5325 | ||
5326 | svalue_id | |
5327 | region_model::set_to_new_unknown_value (region_id dst_rid, tree type, | |
5328 | region_model_context *ctxt) | |
5329 | { | |
5330 | gcc_assert (!dst_rid.null_p ()); | |
5331 | svalue_id new_sid = add_svalue (new unknown_svalue (type)); | |
5332 | set_value (dst_rid, new_sid, ctxt); | |
5333 | ||
5334 | // TODO: presumably purge all child regions too (but do this in set_value?) | |
5335 | ||
5336 | return new_sid; | |
5337 | } | |
5338 | ||
5339 | /* Update this model for any phis in SNODE, assuming we came from | |
5340 | LAST_CFG_SUPEREDGE. */ | |
5341 | ||
5342 | void | |
5343 | region_model::update_for_phis (const supernode *snode, | |
5344 | const cfg_superedge *last_cfg_superedge, | |
5345 | region_model_context *ctxt) | |
5346 | { | |
5347 | gcc_assert (last_cfg_superedge); | |
5348 | ||
5349 | for (gphi_iterator gpi = const_cast<supernode *>(snode)->start_phis (); | |
5350 | !gsi_end_p (gpi); gsi_next (&gpi)) | |
5351 | { | |
5352 | gphi *phi = gpi.phi (); | |
5353 | ||
5354 | tree src = last_cfg_superedge->get_phi_arg (phi); | |
5355 | tree lhs = gimple_phi_result (phi); | |
5356 | ||
5357 | /* Update next_state based on phi. */ | |
5358 | bool is_back_edge = last_cfg_superedge->back_edge_p (); | |
5359 | handle_phi (lhs, src, is_back_edge, ctxt); | |
5360 | } | |
5361 | } | |
5362 | ||
5363 | /* Attempt to update this model for taking EDGE (where the last statement | |
5364 | was LAST_STMT), returning true if the edge can be taken, false | |
5365 | otherwise. | |
5366 | ||
5367 | For CFG superedges where LAST_STMT is a conditional or a switch | |
5368 | statement, attempt to add the relevant conditions for EDGE to this | |
5369 | model, returning true if they are feasible, or false if they are | |
5370 | impossible. | |
5371 | ||
5372 | For call superedges, push frame information and store arguments | |
5373 | into parameters. | |
5374 | ||
5375 | For return superedges, pop frame information and store return | |
5376 | values into any lhs. | |
5377 | ||
5378 | Rejection of call/return superedges happens elsewhere, in | |
5379 | program_point::on_edge (i.e. based on program point, rather | |
5380 | than program state). */ | |
5381 | ||
5382 | bool | |
5383 | region_model::maybe_update_for_edge (const superedge &edge, | |
5384 | const gimple *last_stmt, | |
5385 | region_model_context *ctxt) | |
5386 | { | |
5387 | /* Handle frame updates for interprocedural edges. */ | |
5388 | switch (edge.m_kind) | |
5389 | { | |
5390 | default: | |
5391 | break; | |
5392 | ||
5393 | case SUPEREDGE_CALL: | |
5394 | { | |
5395 | const call_superedge *call_edge = as_a <const call_superedge *> (&edge); | |
5396 | update_for_call_superedge (*call_edge, ctxt); | |
5397 | } | |
5398 | break; | |
5399 | ||
5400 | case SUPEREDGE_RETURN: | |
5401 | { | |
5402 | const return_superedge *return_edge | |
5403 | = as_a <const return_superedge *> (&edge); | |
5404 | update_for_return_superedge (*return_edge, ctxt); | |
5405 | } | |
5406 | break; | |
5407 | ||
5408 | case SUPEREDGE_INTRAPROCEDURAL_CALL: | |
5409 | { | |
5410 | const callgraph_superedge *cg_sedge | |
5411 | = as_a <const callgraph_superedge *> (&edge); | |
5412 | update_for_call_summary (*cg_sedge, ctxt); | |
5413 | } | |
5414 | break; | |
5415 | } | |
5416 | ||
5417 | if (last_stmt == NULL) | |
5418 | return true; | |
5419 | ||
5420 | /* Apply any constraints for conditionals/switch statements. */ | |
5421 | ||
5422 | if (const gcond *cond_stmt = dyn_cast <const gcond *> (last_stmt)) | |
5423 | { | |
5424 | const cfg_superedge *cfg_sedge = as_a <const cfg_superedge *> (&edge); | |
5425 | return apply_constraints_for_gcond (*cfg_sedge, cond_stmt, ctxt); | |
5426 | } | |
5427 | ||
5428 | if (const gswitch *switch_stmt = dyn_cast <const gswitch *> (last_stmt)) | |
5429 | { | |
5430 | const switch_cfg_superedge *switch_sedge | |
5431 | = as_a <const switch_cfg_superedge *> (&edge); | |
5432 | return apply_constraints_for_gswitch (*switch_sedge, switch_stmt, ctxt); | |
5433 | } | |
5434 | ||
5435 | return true; | |
5436 | } | |
5437 | ||
5438 | /* Push a new frame_region on to the stack region. | |
5439 | Populate the frame_region with child regions for the function call's | |
5440 | parameters, using values from the arguments at the callsite in the | |
5441 | caller's frame. */ | |
5442 | ||
5443 | void | |
5444 | region_model::update_for_call_superedge (const call_superedge &call_edge, | |
5445 | region_model_context *ctxt) | |
5446 | { | |
5447 | /* Build a vec of argument svalue_id, using the current top | |
5448 | frame for resolving tree expressions. */ | |
5449 | const gcall *call_stmt = call_edge.get_call_stmt (); | |
5450 | auto_vec<svalue_id> arg_sids (gimple_call_num_args (call_stmt)); | |
5451 | ||
5452 | for (unsigned i = 0; i < gimple_call_num_args (call_stmt); i++) | |
5453 | { | |
5454 | tree arg = gimple_call_arg (call_stmt, i); | |
5455 | arg_sids.quick_push (get_rvalue (arg, ctxt)); | |
5456 | } | |
5457 | ||
5458 | push_frame (call_edge.get_callee_function (), &arg_sids, ctxt); | |
5459 | } | |
5460 | ||
5461 | /* Pop the top-most frame_region from the stack, and store the svalue | |
5462 | for any returned value into the region for the lvalue of the LHS of | |
5463 | the call (if any). */ | |
5464 | ||
5465 | void | |
5466 | region_model::update_for_return_superedge (const return_superedge &return_edge, | |
5467 | region_model_context *ctxt) | |
5468 | { | |
5469 | purge_stats stats; | |
5470 | svalue_id result_sid = pop_frame (true, &stats, ctxt); | |
5471 | // TODO: do something with the stats? | |
5472 | ||
5473 | /* Set the result of the call, within the caller frame. */ | |
5474 | const gcall *call_stmt = return_edge.get_call_stmt (); | |
5475 | tree lhs = gimple_call_lhs (call_stmt); | |
5476 | if (lhs) | |
5477 | set_value (get_lvalue (lhs, ctxt), result_sid, ctxt); | |
5478 | else if (!result_sid.null_p ()) | |
5479 | { | |
5480 | /* This could be a leak; try purging again, but this time, | |
5481 | don't special-case the result_sid. */ | |
5482 | purge_stats stats; | |
5483 | purge_unused_svalues (&stats, ctxt); | |
5484 | } | |
5485 | } | |
5486 | ||
5487 | /* Update this region_model with a summary of the effect of calling | |
5488 | and returning from CG_SEDGE. | |
5489 | ||
5490 | TODO: Currently this is extremely simplistic: we merely set the | |
5491 | return value to "unknown". A proper implementation would e.g. update | |
5492 | sm-state, and presumably be reworked to support multiple outcomes. */ | |
5493 | ||
5494 | void | |
5495 | region_model::update_for_call_summary (const callgraph_superedge &cg_sedge, | |
5496 | region_model_context *ctxt) | |
5497 | { | |
5498 | /* For now, set any return value to "unknown". */ | |
5499 | const gcall *call_stmt = cg_sedge.get_call_stmt (); | |
5500 | tree lhs = gimple_call_lhs (call_stmt); | |
5501 | if (lhs) | |
5502 | set_to_new_unknown_value (get_lvalue (lhs, ctxt), TREE_TYPE (lhs), ctxt); | |
5503 | ||
5504 | // TODO: actually implement some kind of summary here | |
5505 | } | |
5506 | ||
5507 | /* Given a true or false edge guarded by conditional statement COND_STMT, | |
5508 | determine appropriate constraints for the edge to be taken. | |
5509 | ||
5510 | If they are feasible, add the constraints and return true. | |
5511 | ||
5512 | Return false if the constraints contradict existing knowledge | |
5513 | (and so the edge should not be taken). */ | |
5514 | ||
5515 | bool | |
5516 | region_model::apply_constraints_for_gcond (const cfg_superedge &sedge, | |
5517 | const gcond *cond_stmt, | |
5518 | region_model_context *ctxt) | |
5519 | { | |
5520 | ::edge cfg_edge = sedge.get_cfg_edge (); | |
5521 | gcc_assert (cfg_edge != NULL); | |
5522 | gcc_assert (cfg_edge->flags & (EDGE_TRUE_VALUE | EDGE_FALSE_VALUE)); | |
5523 | ||
5524 | enum tree_code op = gimple_cond_code (cond_stmt); | |
5525 | tree lhs = gimple_cond_lhs (cond_stmt); | |
5526 | tree rhs = gimple_cond_rhs (cond_stmt); | |
5527 | if (cfg_edge->flags & EDGE_FALSE_VALUE) | |
5528 | op = invert_tree_comparison (op, false /* honor_nans */); | |
5529 | return add_constraint (lhs, op, rhs, ctxt); | |
5530 | } | |
5531 | ||
5532 | /* Given an EDGE guarded by SWITCH_STMT, determine appropriate constraints | |
5533 | for the edge to be taken. | |
5534 | ||
5535 | If they are feasible, add the constraints and return true. | |
5536 | ||
5537 | Return false if the constraints contradict existing knowledge | |
5538 | (and so the edge should not be taken). */ | |
5539 | ||
5540 | bool | |
5541 | region_model::apply_constraints_for_gswitch (const switch_cfg_superedge &edge, | |
5542 | const gswitch *switch_stmt, | |
5543 | region_model_context *ctxt) | |
5544 | { | |
5545 | tree index = gimple_switch_index (switch_stmt); | |
5546 | tree case_label = edge.get_case_label (); | |
5547 | gcc_assert (TREE_CODE (case_label) == CASE_LABEL_EXPR); | |
5548 | tree lower_bound = CASE_LOW (case_label); | |
5549 | tree upper_bound = CASE_HIGH (case_label); | |
5550 | if (lower_bound) | |
5551 | { | |
5552 | if (upper_bound) | |
5553 | { | |
5554 | /* Range. */ | |
5555 | if (!add_constraint (index, GE_EXPR, lower_bound, ctxt)) | |
5556 | return false; | |
5557 | return add_constraint (index, LE_EXPR, upper_bound, ctxt); | |
5558 | } | |
5559 | else | |
5560 | /* Single-value. */ | |
5561 | return add_constraint (index, EQ_EXPR, lower_bound, ctxt); | |
5562 | } | |
5563 | else | |
5564 | { | |
5565 | /* The default case. | |
5566 | Add exclusions based on the other cases. */ | |
5567 | for (unsigned other_idx = 1; | |
5568 | other_idx < gimple_switch_num_labels (switch_stmt); | |
5569 | other_idx++) | |
5570 | { | |
5571 | tree other_label = gimple_switch_label (switch_stmt, | |
5572 | other_idx); | |
5573 | tree other_lower_bound = CASE_LOW (other_label); | |
5574 | tree other_upper_bound = CASE_HIGH (other_label); | |
5575 | gcc_assert (other_lower_bound); | |
5576 | if (other_upper_bound) | |
5577 | { | |
5578 | /* Exclude this range-valued case. | |
5579 | For now, we just exclude the boundary values. | |
5580 | TODO: exclude the values within the region. */ | |
5581 | if (!add_constraint (index, NE_EXPR, other_lower_bound, ctxt)) | |
5582 | return false; | |
5583 | if (!add_constraint (index, NE_EXPR, other_upper_bound, ctxt)) | |
5584 | return false; | |
5585 | } | |
5586 | else | |
5587 | /* Exclude this single-valued case. */ | |
5588 | if (!add_constraint (index, NE_EXPR, other_lower_bound, ctxt)) | |
5589 | return false; | |
5590 | } | |
5591 | return true; | |
5592 | } | |
5593 | } | |
5594 | ||
5595 | /* Get the root_region within this model (guaranteed to be non-null). */ | |
5596 | ||
5597 | root_region * | |
5598 | region_model::get_root_region () const | |
5599 | { | |
5600 | return get_region<root_region> (m_root_rid); | |
5601 | } | |
5602 | ||
5603 | /* Get the region_id of this model's stack region (if any). */ | |
5604 | ||
5605 | region_id | |
5606 | region_model::get_stack_region_id () const | |
5607 | { | |
5608 | return get_root_region ()->get_stack_region_id (); | |
5609 | } | |
5610 | ||
5611 | /* Create a new frame_region for a call to FUN and push it onto | |
5612 | the stack. | |
5613 | ||
5614 | If ARG_SIDS is non-NULL, use it to populate the parameters | |
5615 | in the new frame. | |
5616 | Otherwise, populate them with unknown values. | |
5617 | ||
5618 | Return the region_id of the new frame_region. */ | |
5619 | ||
5620 | region_id | |
5621 | region_model::push_frame (function *fun, vec<svalue_id> *arg_sids, | |
5622 | region_model_context *ctxt) | |
5623 | { | |
5624 | return get_root_region ()->push_frame (this, fun, arg_sids, ctxt); | |
5625 | } | |
5626 | ||
5627 | /* Get the region_id of the top-most frame in this region_model's stack, | |
5628 | if any. */ | |
5629 | ||
5630 | region_id | |
5631 | region_model::get_current_frame_id () const | |
5632 | { | |
5633 | return get_root_region ()->get_current_frame_id (*this); | |
5634 | } | |
5635 | ||
5636 | /* Get the function of the top-most frame in this region_model's stack. | |
5637 | There must be such a frame. */ | |
5638 | ||
5639 | function * | |
5640 | region_model::get_current_function () const | |
5641 | { | |
5642 | region_id frame_id = get_current_frame_id (); | |
5643 | frame_region *frame = get_region<frame_region> (frame_id); | |
5644 | return frame->get_function (); | |
5645 | } | |
5646 | ||
5647 | /* Pop the topmost frame_region from this region_model's stack; | |
5648 | see the comment for stack_region::pop_frame. */ | |
5649 | ||
5650 | svalue_id | |
5651 | region_model::pop_frame (bool purge, purge_stats *out, | |
5652 | region_model_context *ctxt) | |
5653 | { | |
5654 | return get_root_region ()->pop_frame (this, purge, out, ctxt); | |
5655 | } | |
5656 | ||
5657 | /* Get the number of frames in this region_model's stack. */ | |
5658 | ||
5659 | int | |
5660 | region_model::get_stack_depth () const | |
5661 | { | |
5662 | stack_region *stack = get_root_region ()->get_stack_region (this); | |
5663 | if (stack) | |
5664 | return stack->get_num_frames (); | |
5665 | else | |
5666 | return 0; | |
5667 | } | |
5668 | ||
5669 | /* Get the function * at DEPTH within the call stack. */ | |
5670 | ||
5671 | function * | |
5672 | region_model::get_function_at_depth (unsigned depth) const | |
5673 | { | |
5674 | stack_region *stack = get_root_region ()->get_stack_region (this); | |
5675 | gcc_assert (stack); | |
5676 | region_id frame_rid = stack->get_frame_rid (depth); | |
5677 | frame_region *frame = get_region <frame_region> (frame_rid); | |
5678 | return frame->get_function (); | |
5679 | } | |
5680 | ||
5681 | /* Get the region_id of this model's globals region (if any). */ | |
5682 | ||
5683 | region_id | |
5684 | region_model::get_globals_region_id () const | |
5685 | { | |
5686 | return get_root_region ()->get_globals_region_id (); | |
5687 | } | |
5688 | ||
5689 | /* Add SVAL to this model, taking ownership, and returning its new | |
5690 | svalue_id. */ | |
5691 | ||
5692 | svalue_id | |
5693 | region_model::add_svalue (svalue *sval) | |
5694 | { | |
5695 | gcc_assert (sval); | |
5696 | m_svalues.safe_push (sval); | |
5697 | return svalue_id::from_int (m_svalues.length () - 1); | |
5698 | } | |
5699 | ||
5700 | /* Change the meaning of SID to be NEW_SVAL | |
5701 | (e.g. when deferencing an unknown pointer, the pointer | |
5702 | becomes a pointer to a symbolic region, so that all users | |
5703 | of the former unknown pointer are now effectively pointing | |
5704 | at the same region). */ | |
5705 | ||
5706 | void | |
5707 | region_model::replace_svalue (svalue_id sid, svalue *new_sval) | |
5708 | { | |
5709 | gcc_assert (!sid.null_p ()); | |
5710 | int idx = sid.as_int (); | |
5711 | ||
5712 | gcc_assert (m_svalues[idx]); | |
5713 | gcc_assert (m_svalues[idx]->get_type () == new_sval->get_type ()); | |
5714 | delete m_svalues[idx]; | |
5715 | ||
5716 | m_svalues[idx] = new_sval; | |
5717 | } | |
5718 | ||
5719 | /* Add region R to this model, taking ownership, and returning its new | |
5720 | region_id. */ | |
5721 | ||
5722 | region_id | |
5723 | region_model::add_region (region *r) | |
5724 | { | |
5725 | gcc_assert (r); | |
5726 | m_regions.safe_push (r); | |
5727 | return region_id::from_int (m_regions.length () - 1); | |
5728 | } | |
5729 | ||
5730 | /* Return the svalue with id SVAL_ID, or NULL for a null id. */ | |
5731 | ||
5732 | svalue * | |
5733 | region_model::get_svalue (svalue_id sval_id) const | |
5734 | { | |
5735 | if (sval_id.null_p ()) | |
5736 | return NULL; | |
5737 | return m_svalues[sval_id.as_int ()]; | |
5738 | } | |
5739 | ||
5740 | /* Return the region with id RID, or NULL for a null id. */ | |
5741 | ||
5742 | region * | |
5743 | region_model::get_region (region_id rid) const | |
5744 | { | |
5745 | if (rid.null_p ()) | |
5746 | return NULL; | |
5747 | return m_regions[rid.as_int ()]; | |
5748 | } | |
5749 | ||
5750 | /* Make a region of an appropriate subclass for TYPE, | |
5751 | with parent PARENT_RID. */ | |
5752 | ||
5753 | static region * | |
5754 | make_region_for_type (region_id parent_rid, tree type) | |
5755 | { | |
5756 | gcc_assert (TYPE_P (type)); | |
5757 | ||
5758 | if (INTEGRAL_TYPE_P (type) | |
5759 | || SCALAR_FLOAT_TYPE_P (type) | |
5760 | || POINTER_TYPE_P (type) | |
5761 | || TREE_CODE (type) == COMPLEX_TYPE) | |
5762 | return new primitive_region (parent_rid, type); | |
5763 | ||
5764 | if (TREE_CODE (type) == RECORD_TYPE) | |
5765 | return new struct_region (parent_rid, type); | |
5766 | ||
5767 | if (TREE_CODE (type) == ARRAY_TYPE) | |
5768 | return new array_region (parent_rid, type); | |
5769 | ||
5770 | if (TREE_CODE (type) == UNION_TYPE) | |
5771 | return new union_region (parent_rid, type); | |
5772 | ||
5773 | if (TREE_CODE (type) == FUNCTION_TYPE) | |
5774 | return new function_region (parent_rid, type); | |
5775 | ||
5776 | /* If we have a void *, make a new symbolic region. */ | |
5777 | if (type == void_type_node) | |
5778 | return new symbolic_region (parent_rid, false); | |
5779 | ||
5780 | gcc_unreachable (); | |
5781 | } | |
5782 | ||
5783 | /* Add a region with type TYPE and parent PARENT_RID. */ | |
5784 | ||
5785 | region_id | |
5786 | region_model::add_region_for_type (region_id parent_rid, tree type) | |
5787 | { | |
5788 | gcc_assert (TYPE_P (type)); | |
5789 | ||
5790 | region *new_region = make_region_for_type (parent_rid, type); | |
5791 | return add_region (new_region); | |
5792 | } | |
5793 | ||
5794 | /* Helper class for region_model::purge_unused_svalues. */ | |
5795 | ||
5796 | class restrict_to_used_svalues : public purge_criteria | |
5797 | { | |
5798 | public: | |
5799 | restrict_to_used_svalues (const auto_sbitmap &used) : m_used (used) {} | |
5800 | ||
5801 | bool should_purge_p (svalue_id sid) const FINAL OVERRIDE | |
5802 | { | |
5803 | gcc_assert (!sid.null_p ()); | |
5804 | return !bitmap_bit_p (m_used, sid.as_int ()); | |
5805 | } | |
5806 | ||
5807 | private: | |
5808 | const auto_sbitmap &m_used; | |
5809 | }; | |
5810 | ||
5811 | /* Remove unused svalues from this model, accumulating stats into STATS. | |
5812 | Unused svalues are deleted. Doing so could reorder the svalues, and | |
5813 | thus change the meaning of svalue_ids. | |
5814 | ||
5815 | If CTXT is non-NULL, then it is notified about svalue_id remappings, | |
5816 | and about svalue_ids that are about to be deleted. This allows e.g. | |
5817 | for warning about resource leaks, for the case where the svalue | |
5818 | represents a resource handle in the user code (e.g. a FILE * or a malloc | |
5819 | buffer). | |
5820 | ||
5821 | Amongst other things, removing unused svalues is important for ensuring | |
5822 | that the analysis of loops terminates. Otherwise, we could generate a | |
5823 | succession of models with unreferenced "unknown" values, where the | |
5824 | number of redundant unknown values could grow without bounds, and each | |
5825 | such model would be treated as distinct. | |
5826 | ||
5827 | If KNOWN_USED is non-NULL, treat *KNOWN_USED as used (this is for | |
5828 | handling values being returned from functions as their frame is popped, | |
5829 | since otherwise we'd have to simultaneously determine both the rvalue | |
5830 | of the return expr in the callee frame and the lvalue for the gcall's | |
5831 | assignment in the caller frame, and it seems cleaner to express all | |
5832 | lvalue and rvalue lookups implicitly relative to a "current" frame). */ | |
5833 | ||
5834 | void | |
5835 | region_model::purge_unused_svalues (purge_stats *stats, | |
5836 | region_model_context *ctxt, | |
5837 | svalue_id *known_used_sid) | |
5838 | { | |
5839 | // TODO: might want to avoid a vfunc call just to do logging here: | |
5840 | logger *logger = ctxt ? ctxt->get_logger () : NULL; | |
5841 | ||
5842 | LOG_SCOPE (logger); | |
5843 | ||
5844 | auto_sbitmap used (m_svalues.length ()); | |
5845 | bitmap_clear (used); | |
5846 | ||
5847 | if (known_used_sid) | |
5848 | if (!known_used_sid->null_p ()) | |
5849 | bitmap_set_bit (used, known_used_sid->as_int ()); | |
5850 | ||
5851 | /* Walk the regions, marking sids that are used. */ | |
5852 | unsigned i; | |
5853 | region *r; | |
5854 | FOR_EACH_VEC_ELT (m_regions, i, r) | |
5855 | { | |
5856 | svalue_id sid = r->get_value_direct (); | |
5857 | if (!sid.null_p ()) | |
5858 | bitmap_set_bit (used, sid.as_int ()); | |
5859 | } | |
5860 | ||
5861 | /* Now purge any constraints involving svalues we don't care about. */ | |
5862 | restrict_to_used_svalues criterion (used); | |
5863 | m_constraints->purge (criterion, stats); | |
5864 | ||
5865 | /* Mark any sids that are in constraints that survived. */ | |
5866 | { | |
5867 | equiv_class *ec; | |
5868 | FOR_EACH_VEC_ELT (m_constraints->m_equiv_classes, i, ec) | |
5869 | { | |
5870 | int j; | |
5871 | svalue_id *sid; | |
5872 | FOR_EACH_VEC_ELT (ec->m_vars, j, sid) | |
5873 | { | |
5874 | gcc_assert (!sid->null_p ()); | |
5875 | bitmap_set_bit (used, sid->as_int ()); | |
5876 | } | |
5877 | } | |
5878 | } | |
5879 | ||
5880 | /* Build a mapping from old-sid to new-sid so that we can preserve | |
5881 | order of the used IDs and move all redundant ones to the end. | |
5882 | Iterate though svalue IDs, adding used ones to the front of | |
5883 | the new list, and unused ones to the back. */ | |
5884 | svalue_id_map map (m_svalues.length ()); | |
5885 | int next_used_new_sid = 0; | |
5886 | int after_next_unused_new_sid = m_svalues.length (); | |
5887 | for (unsigned i = 0; i < m_svalues.length (); i++) | |
5888 | { | |
5889 | svalue_id src (svalue_id::from_int (i)); | |
5890 | if (bitmap_bit_p (used, i)) | |
5891 | { | |
5892 | if (logger) | |
5893 | logger->log ("sv%i is used", i); | |
5894 | map.put (src, svalue_id::from_int (next_used_new_sid++)); | |
5895 | } | |
5896 | else | |
5897 | { | |
5898 | if (logger) | |
5899 | logger->log ("sv%i is unused", i); | |
5900 | map.put (src, svalue_id::from_int (--after_next_unused_new_sid)); | |
5901 | } | |
5902 | } | |
5903 | /* The two insertion points should have met. */ | |
5904 | gcc_assert (next_used_new_sid == after_next_unused_new_sid); | |
5905 | ||
5906 | /* Now walk the regions and the constraints, remapping sids, | |
5907 | so that all the redundant svalues are at the end. */ | |
5908 | remap_svalue_ids (map); | |
5909 | ||
5910 | if (logger) | |
5911 | { | |
5912 | logger->start_log_line (); | |
5913 | logger->log_partial ("map: "); | |
5914 | map.dump_to_pp (logger->get_printer ()); | |
5915 | logger->end_log_line (); | |
5916 | } | |
5917 | ||
5918 | /* Notify any client about the remapping and pending deletion. | |
5919 | Potentially this could trigger leak warnings. */ | |
5920 | if (ctxt) | |
5921 | { | |
5922 | ctxt->remap_svalue_ids (map); | |
5923 | int num_client_items_purged | |
5924 | = ctxt->on_svalue_purge (svalue_id::from_int (next_used_new_sid), map); | |
5925 | if (stats) | |
5926 | stats->m_num_client_items += num_client_items_purged; | |
5927 | } | |
5928 | ||
5929 | /* Drop the redundant svalues from the end of the vector. */ | |
5930 | while ((signed)m_svalues.length () > next_used_new_sid) | |
5931 | { | |
5932 | if (logger) | |
5933 | { | |
5934 | svalue_id victim = svalue_id::from_int (m_svalues.length () - 1); | |
5935 | logger->log ("deleting sv%i (was sv%i)", | |
5936 | victim.as_int (), | |
5937 | map.get_src_for_dst (victim).as_int ()); | |
5938 | } | |
5939 | delete m_svalues.pop (); | |
5940 | if (stats) | |
5941 | stats->m_num_svalues++; | |
5942 | } | |
5943 | ||
5944 | if (known_used_sid) | |
5945 | map.update (known_used_sid); | |
5946 | ||
5947 | validate (); | |
5948 | } | |
5949 | ||
5950 | /* Renumber the svalues within this model according to MAP. */ | |
5951 | ||
5952 | void | |
5953 | region_model::remap_svalue_ids (const svalue_id_map &map) | |
5954 | { | |
5955 | /* Update IDs within regions. */ | |
5956 | unsigned i; | |
5957 | region *r; | |
5958 | FOR_EACH_VEC_ELT (m_regions, i, r) | |
5959 | r->remap_svalue_ids (map); | |
5960 | ||
5961 | /* Update IDs within ECs within constraints. */ | |
5962 | m_constraints->remap_svalue_ids (map); | |
5963 | ||
5964 | /* Build a reordered svalues vector. */ | |
5965 | auto_vec<svalue *> new_svalues (m_svalues.length ()); | |
5966 | for (unsigned i = 0; i < m_svalues.length (); i++) | |
5967 | { | |
5968 | svalue_id dst (svalue_id::from_int (i)); | |
5969 | svalue_id src = map.get_src_for_dst (dst); | |
5970 | new_svalues.quick_push (get_svalue (src)); | |
5971 | } | |
5972 | ||
5973 | /* Copy over the reordered vec to m_svalues. */ | |
5974 | m_svalues.truncate (0); | |
5975 | gcc_assert (m_svalues.space (new_svalues.length ())); | |
5976 | svalue *sval; | |
5977 | FOR_EACH_VEC_ELT (new_svalues, i, sval) | |
5978 | m_svalues.quick_push (sval); | |
5979 | } | |
5980 | ||
5981 | /* Renumber the regions within this model according to MAP. */ | |
5982 | ||
5983 | void | |
5984 | region_model::remap_region_ids (const region_id_map &map) | |
5985 | { | |
5986 | /* Update IDs within regions. */ | |
5987 | unsigned i; | |
5988 | region *r; | |
5989 | FOR_EACH_VEC_ELT (m_regions, i, r) | |
5990 | r->remap_region_ids (map); | |
5991 | ||
5992 | /* Update IDs within svalues. */ | |
5993 | svalue *sval; | |
5994 | FOR_EACH_VEC_ELT (m_svalues, i, sval) | |
5995 | sval->remap_region_ids (map); | |
5996 | ||
5997 | /* Build a reordered regions vector. */ | |
5998 | auto_vec<region *> new_regions (m_regions.length ()); | |
5999 | for (unsigned i = 0; i < m_regions.length (); i++) | |
6000 | { | |
6001 | region_id dst (region_id::from_int (i)); | |
6002 | region_id src = map.get_src_for_dst (dst); | |
6003 | new_regions.quick_push (get_region (src)); | |
6004 | } | |
6005 | ||
6006 | /* Copy over the reordered vec to m_regions. */ | |
6007 | m_regions.truncate (0); | |
6008 | gcc_assert (m_regions.space (new_regions.length ())); | |
6009 | FOR_EACH_VEC_ELT (new_regions, i, r) | |
6010 | m_regions.quick_push (r); | |
6011 | } | |
6012 | ||
6013 | /* Delete all regions within SET_TO_PURGE, remapping region IDs for | |
6014 | other regions. It's required that there are no uses of the | |
6015 | regions within the set (or the region IDs will become invalid). | |
6016 | ||
6017 | Accumulate stats to STATS. */ | |
6018 | ||
6019 | void | |
6020 | region_model::purge_regions (const region_id_set &set_to_purge, | |
6021 | purge_stats *stats, | |
6022 | logger *) | |
6023 | { | |
6024 | /* Build a mapping from old-rid to new-rid so that we can preserve | |
6025 | order of the used IDs and move all redundant ones to the end. | |
6026 | Iterate though region IDs, adding used ones to the front of | |
6027 | the new list, and unused ones to the back. */ | |
6028 | region_id_map map (m_regions.length ()); | |
6029 | int next_used_new_rid = 0; | |
6030 | int after_next_unused_new_rid = m_regions.length (); | |
6031 | for (unsigned i = 0; i < m_regions.length (); i++) | |
6032 | { | |
6033 | region_id src (region_id::from_int (i)); | |
6034 | if (set_to_purge.region_p (src)) | |
6035 | map.put (src, region_id::from_int (--after_next_unused_new_rid)); | |
6036 | else | |
6037 | map.put (src, region_id::from_int (next_used_new_rid++)); | |
6038 | } | |
6039 | /* The two insertion points should have met. */ | |
6040 | gcc_assert (next_used_new_rid == after_next_unused_new_rid); | |
6041 | ||
6042 | /* Now walk the regions and svalues, remapping rids, | |
6043 | so that all the redundant regions are at the end. */ | |
6044 | remap_region_ids (map); | |
6045 | ||
6046 | /* Drop the redundant regions from the end of the vector. */ | |
6047 | while ((signed)m_regions.length () > next_used_new_rid) | |
6048 | { | |
6049 | delete m_regions.pop (); | |
6050 | if (stats) | |
6051 | stats->m_num_regions++; | |
6052 | } | |
6053 | } | |
6054 | ||
6055 | /* Populate *OUT with RID and all of its descendents. | |
6056 | If EXCLUDE_RID is non-null, then don't add it or its descendents. */ | |
6057 | ||
6058 | void | |
6059 | region_model::get_descendents (region_id rid, region_id_set *out, | |
6060 | region_id exclude_rid) const | |
6061 | { | |
6062 | out->add_region (rid); | |
6063 | ||
6064 | bool changed = true; | |
6065 | while (changed) | |
6066 | { | |
6067 | changed = false; | |
6068 | unsigned i; | |
6069 | region *r; | |
6070 | FOR_EACH_VEC_ELT (m_regions, i, r) | |
6071 | { | |
6072 | region_id iter_rid = region_id::from_int (i); | |
6073 | if (iter_rid == exclude_rid) | |
6074 | continue; | |
6075 | if (!out->region_p (iter_rid)) | |
6076 | { | |
6077 | region_id parent_rid = r->get_parent (); | |
6078 | if (!parent_rid.null_p ()) | |
6079 | if (out->region_p (parent_rid)) | |
6080 | { | |
6081 | out->add_region (iter_rid); | |
6082 | changed = true; | |
6083 | } | |
6084 | } | |
6085 | } | |
6086 | } | |
6087 | } | |
6088 | ||
6089 | /* Delete RID and all descendent regions. | |
6090 | Find any pointers to such regions; convert convert them to | |
6091 | poisoned values of kind PKIND. | |
6092 | Accumulate stats on purged entities into STATS. */ | |
6093 | ||
6094 | void | |
6095 | region_model::delete_region_and_descendents (region_id rid, | |
6096 | enum poison_kind pkind, | |
6097 | purge_stats *stats, | |
6098 | logger *logger) | |
6099 | { | |
6100 | /* Find all child and descendent regions. */ | |
6101 | region_id_set descendents (this); | |
6102 | get_descendents (rid, &descendents, region_id::null ()); | |
6103 | ||
6104 | /* Find any pointers to such regions; convert to poisoned. */ | |
6105 | poison_any_pointers_to_bad_regions (descendents, pkind); | |
6106 | ||
6107 | /* Delete all such regions. */ | |
6108 | purge_regions (descendents, stats, logger); | |
6109 | } | |
6110 | ||
6111 | /* Find any pointers to regions within BAD_REGIONS; convert them to | |
6112 | poisoned values of kind PKIND. */ | |
6113 | ||
6114 | void | |
6115 | region_model::poison_any_pointers_to_bad_regions (const region_id_set & | |
6116 | bad_regions, | |
6117 | enum poison_kind pkind) | |
6118 | { | |
6119 | int i; | |
6120 | svalue *sval; | |
6121 | FOR_EACH_VEC_ELT (m_svalues, i, sval) | |
6122 | if (region_svalue *ptr_sval = sval->dyn_cast_region_svalue ()) | |
6123 | { | |
6124 | region_id ptr_dst = ptr_sval->get_pointee (); | |
6125 | if (!ptr_dst.null_p ()) | |
6126 | if (bad_regions.region_p (ptr_dst)) | |
6127 | replace_svalue | |
6128 | (svalue_id::from_int (i), | |
6129 | new poisoned_svalue (pkind, sval->get_type ())); | |
6130 | } | |
6131 | } | |
6132 | ||
6133 | /* Attempt to merge THIS with OTHER_MODEL, writing the result | |
6134 | to OUT_MODEL, and populating SID_MAPPING. */ | |
6135 | ||
6136 | bool | |
6137 | region_model::can_merge_with_p (const region_model &other_model, | |
6138 | region_model *out_model, | |
6139 | svalue_id_merger_mapping *sid_mapping) const | |
6140 | { | |
6141 | gcc_assert (m_root_rid == other_model.m_root_rid); | |
6142 | gcc_assert (m_root_rid.as_int () == 0); | |
6143 | gcc_assert (sid_mapping); | |
6144 | gcc_assert (out_model); | |
6145 | ||
6146 | model_merger merger (this, &other_model, out_model, sid_mapping); | |
6147 | ||
6148 | if (!root_region::can_merge_p (get_root_region (), | |
6149 | other_model.get_root_region (), | |
6150 | out_model->get_root_region (), | |
6151 | &merger)) | |
6152 | return false; | |
6153 | ||
6154 | /* Merge constraints. */ | |
6155 | constraint_manager::merge (*m_constraints, | |
6156 | *other_model.m_constraints, | |
6157 | out_model->m_constraints, | |
6158 | merger); | |
6159 | ||
6160 | out_model->validate (); | |
6161 | ||
6162 | /* The merged model should be simpler (or as simple) as the inputs. */ | |
6163 | #if 0 | |
6164 | gcc_assert (out_model->m_svalues.length () <= m_svalues.length ()); | |
6165 | gcc_assert (out_model->m_svalues.length () | |
6166 | <= other_model.m_svalues.length ()); | |
6167 | #endif | |
6168 | gcc_assert (out_model->m_regions.length () <= m_regions.length ()); | |
6169 | gcc_assert (out_model->m_regions.length () | |
6170 | <= other_model.m_regions.length ()); | |
6171 | // TODO: same, for constraints | |
6172 | ||
6173 | return true; | |
6174 | } | |
6175 | ||
6176 | /* As above, but supply a placeholder svalue_id_merger_mapping | |
6177 | instance to be used and receive output. For use in selftests. */ | |
6178 | ||
6179 | bool | |
6180 | region_model::can_merge_with_p (const region_model &other_model, | |
6181 | region_model *out_model) const | |
6182 | { | |
6183 | svalue_id_merger_mapping sid_mapping (*this, other_model); | |
6184 | return can_merge_with_p (other_model, out_model, &sid_mapping); | |
6185 | } | |
6186 | ||
6187 | /* For debugging purposes: look for a region within this region_model | |
6188 | for a decl named NAME (or an SSA_NAME for such a decl), | |
6189 | returning its value, or svalue_id::null if none are found. */ | |
6190 | ||
6191 | svalue_id | |
6192 | region_model::get_value_by_name (const char *name) const | |
6193 | { | |
6194 | gcc_assert (name); | |
6195 | tree identifier = get_identifier (name); | |
6196 | return get_root_region ()->get_value_by_name (identifier, *this); | |
6197 | } | |
6198 | ||
6199 | /* Generate or reuse an svalue_id within this model for an index | |
6200 | into an array of type PTR_TYPE, based on OFFSET_SID. */ | |
6201 | ||
6202 | svalue_id | |
6203 | region_model::convert_byte_offset_to_array_index (tree ptr_type, | |
6204 | svalue_id offset_sid) | |
6205 | { | |
6206 | gcc_assert (POINTER_TYPE_P (ptr_type)); | |
6207 | ||
6208 | if (tree offset_cst = maybe_get_constant (offset_sid)) | |
6209 | { | |
6210 | tree elem_type = TREE_TYPE (ptr_type); | |
6211 | ||
6212 | /* Arithmetic on void-pointers is a GNU C extension, treating the size | |
6213 | of a void as 1. | |
6214 | https://gcc.gnu.org/onlinedocs/gcc/Pointer-Arith.html | |
6215 | ||
6216 | Returning early for this case avoids a diagnostic from within the | |
6217 | call to size_in_bytes. */ | |
6218 | if (TREE_CODE (elem_type) == VOID_TYPE) | |
6219 | return offset_sid; | |
6220 | ||
6221 | /* This might not be a constant. */ | |
6222 | tree byte_size = size_in_bytes (elem_type); | |
6223 | ||
6224 | tree index | |
6225 | = fold_build2 (TRUNC_DIV_EXPR, integer_type_node, | |
6226 | offset_cst, byte_size); | |
6227 | ||
6228 | if (CONSTANT_CLASS_P (index)) | |
6229 | return get_or_create_constant_svalue (index); | |
6230 | } | |
6231 | ||
6232 | /* Otherwise, we don't know the array index; generate a new unknown value. | |
6233 | TODO: do we need to capture the relationship between two unknown | |
6234 | values (the offset and the index)? */ | |
6235 | return add_svalue (new unknown_svalue (integer_type_node)); | |
6236 | } | |
6237 | ||
6238 | /* Get a region of type TYPE for PTR_SID[OFFSET_SID/sizeof (*PTR_SID)]. | |
6239 | ||
6240 | If OFFSET_SID is known to be zero, then dereference PTR_SID. | |
6241 | Otherwise, impose a view of "typeof(*PTR_SID)[]" on *PTR_SID, | |
6242 | and then get a view of type TYPE on the relevant array element. */ | |
6243 | ||
6244 | region_id | |
6245 | region_model::get_or_create_mem_ref (tree type, | |
6246 | svalue_id ptr_sid, | |
6247 | svalue_id offset_sid, | |
6248 | region_model_context *ctxt) | |
6249 | { | |
6250 | svalue *ptr_sval = get_svalue (ptr_sid); | |
6251 | tree ptr_type = ptr_sval->get_type (); | |
6252 | gcc_assert (ptr_type); | |
6253 | ||
6254 | region_id raw_rid = deref_rvalue (ptr_sid, ctxt); | |
6255 | ||
6256 | svalue *offset_sval = get_svalue (offset_sid); | |
6257 | tree offset_type = offset_sval->get_type (); | |
6258 | gcc_assert (offset_type); | |
6259 | ||
6260 | if (constant_svalue *cst_sval = offset_sval->dyn_cast_constant_svalue ()) | |
6261 | { | |
6262 | if (zerop (cst_sval->get_constant ())) | |
6263 | { | |
6264 | /* Handle the zero offset case. */ | |
6265 | return get_or_create_view (raw_rid, type); | |
6266 | } | |
6267 | ||
6268 | /* If we're already within an array of the correct type, | |
6269 | then we want to reuse that array, rather than starting | |
6270 | a new view. | |
6271 | If so, figure out our raw_rid's offset from its parent, | |
6272 | if we can, and use that to offset OFFSET_SID, and create | |
6273 | the element within the parent region. */ | |
6274 | region *raw_reg = get_region (raw_rid); | |
6275 | region_id parent_rid = raw_reg->get_parent (); | |
6276 | tree parent_type = get_region (parent_rid)->get_type (); | |
6277 | if (parent_type | |
6278 | && TREE_CODE (parent_type) == ARRAY_TYPE) | |
6279 | { | |
6280 | // TODO: check we have the correct parent type | |
6281 | array_region *parent_array = get_region <array_region> (parent_rid); | |
6282 | array_region::key_t key_for_raw_rid; | |
6283 | if (parent_array->get_key_for_child_region (raw_rid, | |
6284 | &key_for_raw_rid)) | |
6285 | { | |
6286 | /* Convert from offset to index. */ | |
6287 | svalue_id index_sid | |
6288 | = convert_byte_offset_to_array_index (ptr_type, offset_sid); | |
6289 | if (tree index_cst | |
6290 | = get_svalue (index_sid)->maybe_get_constant ()) | |
6291 | { | |
6292 | array_region::key_t index_offset | |
6293 | = array_region::key_from_constant (index_cst); | |
6294 | array_region::key_t index_rel_to_parent | |
6295 | = key_for_raw_rid + index_offset; | |
6296 | tree index_rel_to_parent_cst | |
6297 | = wide_int_to_tree (integer_type_node, | |
6298 | index_rel_to_parent); | |
6299 | svalue_id index_sid | |
6300 | = get_or_create_constant_svalue (index_rel_to_parent_cst); | |
6301 | ||
6302 | /* Carry on, using the parent region and adjusted index. */ | |
6303 | region_id element_rid | |
6304 | = parent_array->get_element (this, raw_rid, index_sid, | |
6305 | ctxt); | |
6306 | return get_or_create_view (element_rid, type); | |
6307 | } | |
6308 | } | |
6309 | } | |
6310 | } | |
6311 | ||
6312 | tree array_type = build_array_type (TREE_TYPE (ptr_type), | |
6313 | integer_type_node); | |
6314 | region_id array_view_rid = get_or_create_view (raw_rid, array_type); | |
6315 | array_region *array_reg = get_region <array_region> (array_view_rid); | |
6316 | ||
6317 | svalue_id index_sid | |
6318 | = convert_byte_offset_to_array_index (ptr_type, offset_sid); | |
6319 | ||
6320 | region_id element_rid | |
6321 | = array_reg->get_element (this, array_view_rid, index_sid, ctxt); | |
6322 | ||
6323 | return get_or_create_view (element_rid, type); | |
6324 | } | |
6325 | ||
6326 | /* Get a region of type TYPE for PTR_SID + OFFSET_SID. | |
6327 | ||
6328 | If OFFSET_SID is known to be zero, then dereference PTR_SID. | |
6329 | Otherwise, impose a view of "typeof(*PTR_SID)[]" on *PTR_SID, | |
6330 | and then get a view of type TYPE on the relevant array element. */ | |
6331 | ||
6332 | region_id | |
6333 | region_model::get_or_create_pointer_plus_expr (tree type, | |
6334 | svalue_id ptr_sid, | |
6335 | svalue_id offset_in_bytes_sid, | |
6336 | region_model_context *ctxt) | |
6337 | { | |
6338 | return get_or_create_mem_ref (type, | |
6339 | ptr_sid, | |
6340 | offset_in_bytes_sid, | |
6341 | ctxt); | |
6342 | } | |
6343 | ||
6344 | /* Get or create a view of type TYPE of the region with id RAW_ID. | |
6345 | Return the id of the view (or RAW_ID if it of the same type). */ | |
6346 | ||
6347 | region_id | |
6348 | region_model::get_or_create_view (region_id raw_rid, tree type) | |
6349 | { | |
6350 | region *raw_region = get_region (raw_rid); | |
6351 | ||
6352 | gcc_assert (TYPE_P (type)); | |
6353 | if (type != raw_region->get_type ()) | |
6354 | { | |
6355 | /* If the region already has a view of the requested type, | |
6356 | reuse it. */ | |
6357 | region_id existing_view_rid = raw_region->get_view (type, this); | |
6358 | if (!existing_view_rid.null_p ()) | |
6359 | return existing_view_rid; | |
6360 | ||
6361 | /* Otherwise, make one (adding it to the region_model and | |
6362 | to the viewed region). */ | |
6363 | region_id view_rid = add_region_for_type (raw_rid, type); | |
6364 | raw_region->add_view (view_rid, this); | |
6365 | // TODO: something to signify that this is a "view" | |
6366 | return view_rid; | |
6367 | } | |
6368 | ||
6369 | return raw_rid; | |
6370 | } | |
6371 | ||
6372 | /* Attempt to get the fndecl used at CALL, if known, or NULL_TREE | |
6373 | otherwise. */ | |
6374 | ||
6375 | tree | |
6376 | region_model::get_fndecl_for_call (const gcall *call, | |
6377 | region_model_context *ctxt) | |
6378 | { | |
6379 | tree fn_ptr = gimple_call_fn (call); | |
6380 | if (fn_ptr == NULL_TREE) | |
6381 | return NULL_TREE; | |
6382 | svalue_id fn_ptr_sid = get_rvalue (fn_ptr, ctxt); | |
6383 | svalue *fn_ptr_sval = get_svalue (fn_ptr_sid); | |
6384 | if (region_svalue *fn_ptr_ptr = fn_ptr_sval->dyn_cast_region_svalue ()) | |
6385 | { | |
6386 | region_id fn_rid = fn_ptr_ptr->get_pointee (); | |
6387 | code_region *code = get_root_region ()->get_code_region (this); | |
6388 | if (code) | |
6389 | { | |
6390 | tree fn_decl = code->get_tree_for_child_region (fn_rid); | |
6391 | return fn_decl; | |
6392 | } | |
6393 | } | |
6394 | ||
6395 | return NULL_TREE; | |
6396 | } | |
6397 | ||
6398 | /* struct model_merger. */ | |
6399 | ||
6400 | /* Dump a multiline representation of this merger to PP. */ | |
6401 | ||
6402 | void | |
6403 | model_merger::dump_to_pp (pretty_printer *pp) const | |
6404 | { | |
6405 | pp_string (pp, "model A:"); | |
6406 | pp_newline (pp); | |
6407 | m_model_a->dump_to_pp (pp, false); | |
6408 | pp_newline (pp); | |
6409 | ||
6410 | pp_string (pp, "model B:"); | |
6411 | pp_newline (pp); | |
6412 | m_model_b->dump_to_pp (pp, false); | |
6413 | pp_newline (pp); | |
6414 | ||
6415 | pp_string (pp, "merged model:"); | |
6416 | pp_newline (pp); | |
6417 | m_merged_model->dump_to_pp (pp, false); | |
6418 | pp_newline (pp); | |
6419 | ||
6420 | pp_string (pp, "region map: model A to merged model:"); | |
6421 | pp_newline (pp); | |
6422 | m_map_regions_from_a_to_m.dump_to_pp (pp); | |
6423 | pp_newline (pp); | |
6424 | ||
6425 | pp_string (pp, "region map: model B to merged model:"); | |
6426 | pp_newline (pp); | |
6427 | m_map_regions_from_b_to_m.dump_to_pp (pp); | |
6428 | pp_newline (pp); | |
6429 | ||
6430 | m_sid_mapping->dump_to_pp (pp); | |
6431 | } | |
6432 | ||
6433 | /* Dump a multiline representation of this merger to FILE. */ | |
6434 | ||
6435 | void | |
6436 | model_merger::dump (FILE *fp) const | |
6437 | { | |
6438 | pretty_printer pp; | |
6439 | pp_format_decoder (&pp) = default_tree_printer; | |
6440 | pp_show_color (&pp) = pp_show_color (global_dc->printer); | |
6441 | pp.buffer->stream = fp; | |
6442 | dump_to_pp (&pp); | |
6443 | pp_flush (&pp); | |
6444 | } | |
6445 | ||
6446 | /* Dump a multiline representation of this merger to stderr. */ | |
6447 | ||
6448 | DEBUG_FUNCTION void | |
6449 | model_merger::dump () const | |
6450 | { | |
6451 | dump (stderr); | |
6452 | } | |
6453 | ||
6454 | /* Attempt to merge the svalues of SID_A and SID_B (from their | |
6455 | respective models), writing the id of the resulting svalue | |
6456 | into *MERGED_SID. | |
6457 | Return true if the merger is possible, false otherwise. */ | |
6458 | ||
6459 | bool | |
6460 | model_merger::can_merge_values_p (svalue_id sid_a, | |
6461 | svalue_id sid_b, | |
6462 | svalue_id *merged_sid) | |
6463 | { | |
6464 | gcc_assert (merged_sid); | |
6465 | svalue *sval_a = m_model_a->get_svalue (sid_a); | |
6466 | svalue *sval_b = m_model_b->get_svalue (sid_b); | |
6467 | ||
6468 | /* If both are NULL, then the "values" are trivially mergeable. */ | |
6469 | if (!sval_a && !sval_b) | |
6470 | return true; | |
6471 | ||
6472 | /* If one is NULL and the other non-NULL, then the "values" | |
6473 | are not mergeable. */ | |
6474 | if (!(sval_a && sval_b)) | |
6475 | return false; | |
6476 | ||
6477 | /* Have they both already been mapped to the same new svalue_id? | |
6478 | If so, use it. */ | |
6479 | svalue_id sid_a_in_m | |
6480 | = m_sid_mapping->m_map_from_a_to_m.get_dst_for_src (sid_a); | |
6481 | svalue_id sid_b_in_m | |
6482 | = m_sid_mapping->m_map_from_b_to_m.get_dst_for_src (sid_b); | |
6483 | if (!sid_a_in_m.null_p () | |
6484 | && !sid_b_in_m.null_p () | |
6485 | && sid_a_in_m == sid_b_in_m) | |
6486 | { | |
6487 | *merged_sid = sid_a_in_m; | |
6488 | return true; | |
6489 | } | |
6490 | ||
6491 | tree type = sval_a->get_type (); | |
6492 | if (type == NULL_TREE) | |
6493 | type = sval_b->get_type (); | |
6494 | ||
6495 | /* If the values have different kinds, or are both unknown, | |
6496 | then merge as "unknown". */ | |
6497 | if (sval_a->get_kind () != sval_b->get_kind () | |
6498 | || sval_a->get_kind () == SK_UNKNOWN) | |
6499 | { | |
6500 | svalue *merged_sval = new unknown_svalue (type); | |
6501 | *merged_sid = m_merged_model->add_svalue (merged_sval); | |
6502 | record_svalues (sid_a, sid_b, *merged_sid); | |
6503 | return true; | |
6504 | } | |
6505 | ||
6506 | gcc_assert (sval_a->get_kind () == sval_b->get_kind ()); | |
6507 | ||
6508 | switch (sval_a->get_kind ()) | |
6509 | { | |
6510 | default: | |
6511 | case SK_UNKNOWN: /* SK_UNKNOWN handled above. */ | |
6512 | gcc_unreachable (); | |
6513 | ||
6514 | case SK_REGION: | |
6515 | { | |
6516 | /* If we have two region pointers, then we can merge (possibly to | |
6517 | "unknown"). */ | |
6518 | const region_svalue ®ion_sval_a = *as_a <region_svalue *> (sval_a); | |
6519 | const region_svalue ®ion_sval_b = *as_a <region_svalue *> (sval_b); | |
6520 | region_svalue::merge_values (region_sval_a, region_sval_b, | |
6521 | merged_sid, type, | |
6522 | this); | |
6523 | record_svalues (sid_a, sid_b, *merged_sid); | |
6524 | return true; | |
6525 | } | |
6526 | break; | |
6527 | case SK_CONSTANT: | |
6528 | { | |
6529 | /* If we have two constants, then we can merge. */ | |
6530 | const constant_svalue &cst_sval_a = *as_a <constant_svalue *> (sval_a); | |
6531 | const constant_svalue &cst_sval_b = *as_a <constant_svalue *> (sval_b); | |
6532 | constant_svalue::merge_values (cst_sval_a, cst_sval_b, | |
6533 | merged_sid, this); | |
6534 | record_svalues (sid_a, sid_b, *merged_sid); | |
6535 | return true; | |
6536 | } | |
6537 | break; | |
6538 | ||
6539 | case SK_POISONED: | |
6540 | case SK_SETJMP: | |
6541 | return false; | |
6542 | } | |
6543 | } | |
6544 | ||
6545 | /* Record that A_RID in model A and B_RID in model B | |
6546 | correspond to MERGED_RID in the merged model, so | |
6547 | that pointers can be accurately merged. */ | |
6548 | ||
6549 | void | |
6550 | model_merger::record_regions (region_id a_rid, | |
6551 | region_id b_rid, | |
6552 | region_id merged_rid) | |
6553 | { | |
6554 | m_map_regions_from_a_to_m.put (a_rid, merged_rid); | |
6555 | m_map_regions_from_b_to_m.put (b_rid, merged_rid); | |
6556 | } | |
6557 | ||
6558 | /* Record that A_SID in model A and B_SID in model B | |
6559 | correspond to MERGED_SID in the merged model. */ | |
6560 | ||
6561 | void | |
6562 | model_merger::record_svalues (svalue_id a_sid, | |
6563 | svalue_id b_sid, | |
6564 | svalue_id merged_sid) | |
6565 | { | |
6566 | gcc_assert (m_sid_mapping); | |
6567 | m_sid_mapping->m_map_from_a_to_m.put (a_sid, merged_sid); | |
6568 | m_sid_mapping->m_map_from_b_to_m.put (b_sid, merged_sid); | |
6569 | } | |
6570 | ||
6571 | /* struct svalue_id_merger_mapping. */ | |
6572 | ||
6573 | /* svalue_id_merger_mapping's ctor. */ | |
6574 | ||
6575 | svalue_id_merger_mapping::svalue_id_merger_mapping (const region_model &a, | |
6576 | const region_model &b) | |
6577 | : m_map_from_a_to_m (a.get_num_svalues ()), | |
6578 | m_map_from_b_to_m (b.get_num_svalues ()) | |
6579 | { | |
6580 | } | |
6581 | ||
6582 | /* Dump a multiline representation of this to PP. */ | |
6583 | ||
6584 | void | |
6585 | svalue_id_merger_mapping::dump_to_pp (pretty_printer *pp) const | |
6586 | { | |
6587 | pp_string (pp, "svalue_id map: model A to merged model:"); | |
6588 | pp_newline (pp); | |
6589 | m_map_from_a_to_m.dump_to_pp (pp); | |
6590 | pp_newline (pp); | |
6591 | ||
6592 | pp_string (pp, "svalue_id map: model B to merged model:"); | |
6593 | pp_newline (pp); | |
6594 | m_map_from_b_to_m.dump_to_pp (pp); | |
6595 | pp_newline (pp); | |
6596 | } | |
6597 | ||
6598 | /* Dump a multiline representation of this to FILE. */ | |
6599 | ||
6600 | void | |
6601 | svalue_id_merger_mapping::dump (FILE *fp) const | |
6602 | { | |
6603 | pretty_printer pp; | |
6604 | pp_format_decoder (&pp) = default_tree_printer; | |
6605 | pp_show_color (&pp) = pp_show_color (global_dc->printer); | |
6606 | pp.buffer->stream = fp; | |
6607 | dump_to_pp (&pp); | |
6608 | pp_flush (&pp); | |
6609 | } | |
6610 | ||
6611 | /* Dump a multiline representation of this to stderr. */ | |
6612 | ||
6613 | DEBUG_FUNCTION void | |
6614 | svalue_id_merger_mapping::dump () const | |
6615 | { | |
6616 | dump (stderr); | |
6617 | } | |
6618 | ||
6619 | /* struct canonicalization. */ | |
6620 | ||
6621 | /* canonicalization's ctor. */ | |
6622 | ||
6623 | canonicalization::canonicalization (const region_model &model) | |
6624 | : m_model (model), | |
6625 | m_rid_map (model.get_num_regions ()), | |
6626 | m_sid_map (model.get_num_svalues ()), | |
6627 | m_next_rid_int (0), | |
6628 | m_next_sid_int (0) | |
6629 | { | |
6630 | } | |
6631 | ||
6632 | /* If we've not seen RID yet, assign it a canonicalized region_id, | |
6633 | and walk the region's svalue and then the region. */ | |
6634 | ||
6635 | void | |
6636 | canonicalization::walk_rid (region_id rid) | |
6637 | { | |
6638 | /* Stop if we've already seen RID. */ | |
6639 | if (!m_rid_map.get_dst_for_src (rid).null_p ()) | |
6640 | return; | |
6641 | ||
6642 | region *region = m_model.get_region (rid); | |
6643 | if (region) | |
6644 | { | |
6645 | m_rid_map.put (rid, region_id::from_int (m_next_rid_int++)); | |
6646 | walk_sid (region->get_value_direct ()); | |
6647 | region->walk_for_canonicalization (this); | |
6648 | } | |
6649 | } | |
6650 | ||
6651 | /* If we've not seen SID yet, assign it a canonicalized svalue_id, | |
6652 | and walk the svalue (and potentially regions e.g. for ptr values). */ | |
6653 | ||
6654 | void | |
6655 | canonicalization::walk_sid (svalue_id sid) | |
6656 | { | |
6657 | /* Stop if we've already seen SID. */ | |
6658 | if (!m_sid_map.get_dst_for_src (sid).null_p ()) | |
6659 | return; | |
6660 | ||
6661 | svalue *sval = m_model.get_svalue (sid); | |
6662 | if (sval) | |
6663 | { | |
6664 | m_sid_map.put (sid, svalue_id::from_int (m_next_sid_int++)); | |
6665 | /* Potentially walk regions e.g. for ptrs. */ | |
6666 | sval->walk_for_canonicalization (this); | |
6667 | } | |
6668 | } | |
6669 | ||
6670 | /* Dump a multiline representation of this to PP. */ | |
6671 | ||
6672 | void | |
6673 | canonicalization::dump_to_pp (pretty_printer *pp) const | |
6674 | { | |
6675 | pp_string (pp, "region_id map:"); | |
6676 | pp_newline (pp); | |
6677 | m_rid_map.dump_to_pp (pp); | |
6678 | pp_newline (pp); | |
6679 | ||
6680 | pp_string (pp, "svalue_id map:"); | |
6681 | pp_newline (pp); | |
6682 | m_sid_map.dump_to_pp (pp); | |
6683 | pp_newline (pp); | |
6684 | } | |
6685 | ||
6686 | /* Dump a multiline representation of this to FILE. */ | |
6687 | ||
6688 | void | |
6689 | canonicalization::dump (FILE *fp) const | |
6690 | { | |
6691 | pretty_printer pp; | |
6692 | pp_format_decoder (&pp) = default_tree_printer; | |
6693 | pp_show_color (&pp) = pp_show_color (global_dc->printer); | |
6694 | pp.buffer->stream = fp; | |
6695 | dump_to_pp (&pp); | |
6696 | pp_flush (&pp); | |
6697 | } | |
6698 | ||
6699 | /* Dump a multiline representation of this to stderr. */ | |
6700 | ||
6701 | DEBUG_FUNCTION void | |
6702 | canonicalization::dump () const | |
6703 | { | |
6704 | dump (stderr); | |
6705 | } | |
6706 | ||
6707 | /* Update HSTATE with a hash of SID. */ | |
6708 | ||
6709 | void | |
6710 | inchash::add (svalue_id sid, inchash::hash &hstate) | |
6711 | { | |
6712 | hstate.add_int (sid.as_int ()); | |
6713 | } | |
6714 | ||
6715 | /* Update HSTATE with a hash of RID. */ | |
6716 | ||
6717 | void | |
6718 | inchash::add (region_id rid, inchash::hash &hstate) | |
6719 | { | |
6720 | hstate.add_int (rid.as_int ()); | |
6721 | } | |
6722 | ||
6723 | /* Dump RMODEL fully to stderr (i.e. without summarization). */ | |
6724 | ||
6725 | DEBUG_FUNCTION void | |
6726 | debug (const region_model &rmodel) | |
6727 | { | |
6728 | rmodel.dump (false); | |
6729 | } | |
6730 | ||
6731 | #if CHECKING_P | |
6732 | ||
6733 | namespace selftest { | |
6734 | ||
6735 | /* Implementation detail of the ASSERT_CONDITION_* macros. */ | |
6736 | ||
6737 | void | |
6738 | assert_condition (const location &loc, | |
6739 | region_model &model, | |
6740 | tree lhs, tree_code op, tree rhs, | |
6741 | tristate expected) | |
6742 | { | |
6743 | tristate actual = model.eval_condition (lhs, op, rhs, NULL); | |
6744 | ASSERT_EQ_AT (loc, actual, expected); | |
6745 | } | |
6746 | ||
6747 | /* Implementation detail of ASSERT_DUMP_EQ. */ | |
6748 | ||
6749 | static void | |
6750 | assert_dump_eq (const location &loc, | |
6751 | const region_model &model, | |
6752 | bool summarize, | |
6753 | const char *expected) | |
6754 | { | |
6755 | auto_fix_quotes sentinel; | |
6756 | pretty_printer pp; | |
6757 | pp_format_decoder (&pp) = default_tree_printer; | |
6758 | model.dump_to_pp (&pp, summarize); | |
6759 | ASSERT_STREQ_AT (loc, pp_formatted_text (&pp), expected); | |
6760 | } | |
6761 | ||
6762 | /* Assert that MODEL.dump_to_pp (SUMMARIZE) is EXPECTED. */ | |
6763 | ||
6764 | #define ASSERT_DUMP_EQ(MODEL, SUMMARIZE, EXPECTED) \ | |
6765 | SELFTEST_BEGIN_STMT \ | |
6766 | assert_dump_eq ((SELFTEST_LOCATION), (MODEL), (SUMMARIZE), (EXPECTED)); \ | |
6767 | SELFTEST_END_STMT | |
6768 | ||
6769 | /* Smoketest for region_model::dump_to_pp. */ | |
6770 | ||
6771 | static void | |
6772 | test_dump () | |
6773 | { | |
6774 | region_model model; | |
6775 | model.get_root_region ()->ensure_stack_region (&model); | |
6776 | model.get_root_region ()->ensure_globals_region (&model); | |
6777 | model.get_root_region ()->ensure_heap_region (&model); | |
6778 | ||
6779 | ASSERT_DUMP_EQ (model, false, | |
6780 | "r0: {kind: `root', parent: null, sval: null}\n" | |
6781 | "|-stack: r1: {kind: `stack', parent: r0, sval: sv0}\n" | |
6782 | "| |: sval: sv0: {poisoned: uninit}\n" | |
6783 | "|-globals: r2: {kind: `globals', parent: r0, sval: null, map: {}}\n" | |
6784 | "`-heap: r3: {kind: `heap', parent: r0, sval: sv1}\n" | |
6785 | " |: sval: sv1: {poisoned: uninit}\n" | |
6786 | "svalues:\n" | |
6787 | " sv0: {poisoned: uninit}\n" | |
6788 | " sv1: {poisoned: uninit}\n" | |
6789 | "constraint manager:\n" | |
6790 | " equiv classes:\n" | |
6791 | " constraints:\n"); | |
6792 | ASSERT_DUMP_EQ (model, true, ""); | |
6793 | } | |
6794 | ||
6795 | /* Verify that calling region_model::get_rvalue repeatedly on the same | |
6796 | tree constant retrieves the same svalue_id. */ | |
6797 | ||
6798 | static void | |
6799 | test_unique_constants () | |
6800 | { | |
6801 | tree int_0 = build_int_cst (integer_type_node, 0); | |
6802 | tree int_42 = build_int_cst (integer_type_node, 42); | |
6803 | ||
6804 | test_region_model_context ctxt; | |
6805 | region_model model; | |
6806 | ASSERT_EQ (model.get_rvalue (int_0, &ctxt), model.get_rvalue (int_0, &ctxt)); | |
6807 | ASSERT_EQ (model.get_rvalue (int_42, &ctxt), | |
6808 | model.get_rvalue (int_42, &ctxt)); | |
6809 | ASSERT_NE (model.get_rvalue (int_0, &ctxt), model.get_rvalue (int_42, &ctxt)); | |
6810 | ASSERT_EQ (ctxt.get_num_diagnostics (), 0); | |
6811 | } | |
6812 | ||
6813 | /* Check that operator== and hashing works as expected for the | |
6814 | various svalue subclasses. */ | |
6815 | ||
6816 | static void | |
6817 | test_svalue_equality () | |
6818 | { | |
6819 | tree int_42 = build_int_cst (integer_type_node, 42); | |
6820 | tree int_0 = build_int_cst (integer_type_node, 0); | |
6821 | ||
6822 | /* Create pairs instances of the various subclasses of svalue, | |
6823 | testing for hash and equality between (this, this) and | |
6824 | (this, other of same subclass). */ | |
6825 | svalue *ptr_to_r0 | |
6826 | = new region_svalue (ptr_type_node, region_id::from_int (0)); | |
6827 | svalue *ptr_to_r1 | |
6828 | = new region_svalue (ptr_type_node, region_id::from_int (1)); | |
6829 | ||
6830 | ASSERT_EQ (ptr_to_r0->hash (), ptr_to_r0->hash ()); | |
6831 | ASSERT_EQ (*ptr_to_r0, *ptr_to_r0); | |
6832 | ||
6833 | ASSERT_NE (ptr_to_r0->hash (), ptr_to_r1->hash ()); | |
6834 | ASSERT_NE (*ptr_to_r0, *ptr_to_r1); | |
6835 | ||
6836 | svalue *cst_int_42 = new constant_svalue (int_42); | |
6837 | svalue *cst_int_0 = new constant_svalue (int_0); | |
6838 | ||
6839 | ASSERT_EQ (cst_int_42->hash (), cst_int_42->hash ()); | |
6840 | ASSERT_EQ (*cst_int_42, *cst_int_42); | |
6841 | ||
6842 | ASSERT_NE (cst_int_42->hash (), cst_int_0->hash ()); | |
6843 | ASSERT_NE (*cst_int_42, *cst_int_0); | |
6844 | ||
6845 | svalue *uninit = new poisoned_svalue (POISON_KIND_UNINIT, NULL_TREE); | |
6846 | svalue *freed = new poisoned_svalue (POISON_KIND_FREED, NULL_TREE); | |
6847 | ||
6848 | ASSERT_EQ (uninit->hash (), uninit->hash ()); | |
6849 | ASSERT_EQ (*uninit, *uninit); | |
6850 | ||
6851 | ASSERT_NE (uninit->hash (), freed->hash ()); | |
6852 | ASSERT_NE (*uninit, *freed); | |
6853 | ||
6854 | svalue *unknown_0 = new unknown_svalue (ptr_type_node); | |
6855 | svalue *unknown_1 = new unknown_svalue (ptr_type_node); | |
6856 | ASSERT_EQ (unknown_0->hash (), unknown_0->hash ()); | |
6857 | ASSERT_EQ (*unknown_0, *unknown_0); | |
6858 | ASSERT_EQ (*unknown_1, *unknown_1); | |
6859 | ||
6860 | /* Comparisons between different kinds of svalue. */ | |
6861 | ASSERT_NE (*ptr_to_r0, *cst_int_42); | |
6862 | ASSERT_NE (*ptr_to_r0, *uninit); | |
6863 | ASSERT_NE (*ptr_to_r0, *unknown_0); | |
6864 | ASSERT_NE (*cst_int_42, *ptr_to_r0); | |
6865 | ASSERT_NE (*cst_int_42, *uninit); | |
6866 | ASSERT_NE (*cst_int_42, *unknown_0); | |
6867 | ASSERT_NE (*uninit, *ptr_to_r0); | |
6868 | ASSERT_NE (*uninit, *cst_int_42); | |
6869 | ASSERT_NE (*uninit, *unknown_0); | |
6870 | ASSERT_NE (*unknown_0, *ptr_to_r0); | |
6871 | ASSERT_NE (*unknown_0, *cst_int_42); | |
6872 | ASSERT_NE (*unknown_0, *uninit); | |
6873 | ||
6874 | delete ptr_to_r0; | |
6875 | delete ptr_to_r1; | |
6876 | delete cst_int_42; | |
6877 | delete cst_int_0; | |
6878 | delete uninit; | |
6879 | delete freed; | |
6880 | delete unknown_0; | |
6881 | delete unknown_1; | |
6882 | } | |
6883 | ||
6884 | /* Check that operator== and hashing works as expected for the | |
6885 | various region subclasses. */ | |
6886 | ||
6887 | static void | |
6888 | test_region_equality () | |
6889 | { | |
6890 | region *r0 | |
6891 | = new primitive_region (region_id::from_int (3), integer_type_node); | |
6892 | region *r1 | |
6893 | = new primitive_region (region_id::from_int (4), integer_type_node); | |
6894 | ||
6895 | ASSERT_EQ (*r0, *r0); | |
6896 | ASSERT_EQ (r0->hash (), r0->hash ()); | |
6897 | ASSERT_NE (*r0, *r1); | |
6898 | ASSERT_NE (r0->hash (), r1->hash ()); | |
6899 | ||
6900 | delete r0; | |
6901 | delete r1; | |
6902 | ||
6903 | // TODO: test coverage for the map within a map_region | |
6904 | } | |
6905 | ||
6906 | /* A subclass of purge_criteria for selftests: purge all svalue_id instances. */ | |
6907 | ||
6908 | class purge_all_svalue_ids : public purge_criteria | |
6909 | { | |
6910 | public: | |
6911 | bool should_purge_p (svalue_id) const FINAL OVERRIDE | |
6912 | { | |
6913 | return true; | |
6914 | } | |
6915 | }; | |
6916 | ||
6917 | /* A subclass of purge_criteria: purge a specific svalue_id. */ | |
6918 | ||
6919 | class purge_one_svalue_id : public purge_criteria | |
6920 | { | |
6921 | public: | |
6922 | purge_one_svalue_id (svalue_id victim) : m_victim (victim) {} | |
6923 | ||
6924 | purge_one_svalue_id (region_model model, tree expr) | |
6925 | : m_victim (model.get_rvalue (expr, NULL)) {} | |
6926 | ||
6927 | bool should_purge_p (svalue_id sid) const FINAL OVERRIDE | |
6928 | { | |
6929 | return sid == m_victim; | |
6930 | } | |
6931 | ||
6932 | private: | |
6933 | svalue_id m_victim; | |
6934 | }; | |
6935 | ||
6936 | /* Check that constraint_manager::purge works for individual svalue_ids. */ | |
6937 | ||
6938 | static void | |
6939 | test_purging_by_criteria () | |
6940 | { | |
6941 | tree int_42 = build_int_cst (integer_type_node, 42); | |
6942 | tree int_0 = build_int_cst (integer_type_node, 0); | |
6943 | ||
6944 | tree x = build_global_decl ("x", integer_type_node); | |
6945 | tree y = build_global_decl ("y", integer_type_node); | |
6946 | ||
6947 | { | |
6948 | region_model model0; | |
6949 | region_model model1; | |
6950 | ||
6951 | ADD_SAT_CONSTRAINT (model1, x, EQ_EXPR, y); | |
6952 | ASSERT_NE (model0, model1); | |
6953 | ||
6954 | purge_stats stats_for_px; | |
6955 | purge_one_svalue_id px (model1, x); | |
6956 | model1.get_constraints ()->purge (px, &stats_for_px); | |
6957 | ASSERT_EQ (stats_for_px.m_num_equiv_classes, 0); | |
6958 | ||
6959 | purge_stats stats_for_py; | |
6960 | purge_one_svalue_id py (model1.get_rvalue (y, NULL)); | |
6961 | model1.get_constraints ()->purge (py, &stats_for_py); | |
6962 | ASSERT_EQ (stats_for_py.m_num_equiv_classes, 1); | |
6963 | ||
6964 | ASSERT_EQ (*model0.get_constraints (), *model1.get_constraints ()); | |
6965 | } | |
6966 | ||
6967 | { | |
6968 | region_model model0; | |
6969 | region_model model1; | |
6970 | ||
6971 | ADD_SAT_CONSTRAINT (model1, x, EQ_EXPR, int_42); | |
6972 | ASSERT_NE (model0, model1); | |
6973 | ASSERT_CONDITION_TRUE (model1, x, EQ_EXPR, int_42); | |
6974 | ||
6975 | purge_stats stats; | |
6976 | model1.get_constraints ()->purge (purge_one_svalue_id (model1, x), &stats); | |
6977 | ||
6978 | ASSERT_CONDITION_UNKNOWN (model1, x, EQ_EXPR, int_42); | |
6979 | } | |
6980 | ||
6981 | { | |
6982 | region_model model0; | |
6983 | region_model model1; | |
6984 | ||
6985 | ADD_SAT_CONSTRAINT (model1, x, GE_EXPR, int_0); | |
6986 | ADD_SAT_CONSTRAINT (model1, x, LE_EXPR, int_42); | |
6987 | ASSERT_NE (model0, model1); | |
6988 | ||
6989 | ASSERT_CONDITION_TRUE (model1, x, GE_EXPR, int_0); | |
6990 | ASSERT_CONDITION_TRUE (model1, x, LE_EXPR, int_42); | |
6991 | ||
6992 | purge_stats stats; | |
6993 | model1.get_constraints ()->purge (purge_one_svalue_id (model1, x), &stats); | |
6994 | ||
6995 | ASSERT_CONDITION_UNKNOWN (model1, x, GE_EXPR, int_0); | |
6996 | ASSERT_CONDITION_UNKNOWN (model1, x, LE_EXPR, int_42); | |
6997 | } | |
6998 | ||
6999 | { | |
7000 | region_model model0; | |
7001 | region_model model1; | |
7002 | ||
7003 | ADD_SAT_CONSTRAINT (model1, x, NE_EXPR, int_42); | |
7004 | ADD_SAT_CONSTRAINT (model1, y, NE_EXPR, int_0); | |
7005 | ASSERT_NE (model0, model1); | |
7006 | ASSERT_CONDITION_TRUE (model1, x, NE_EXPR, int_42); | |
7007 | ASSERT_CONDITION_TRUE (model1, y, NE_EXPR, int_0); | |
7008 | ||
7009 | purge_stats stats; | |
7010 | model1.get_constraints ()->purge (purge_one_svalue_id (model1, x), &stats); | |
7011 | ASSERT_NE (model0, model1); | |
7012 | ||
7013 | ASSERT_CONDITION_UNKNOWN (model1, x, NE_EXPR, int_42); | |
7014 | ASSERT_CONDITION_TRUE (model1, y, NE_EXPR, int_0); | |
7015 | } | |
7016 | ||
7017 | { | |
7018 | region_model model0; | |
7019 | region_model model1; | |
7020 | ||
7021 | ADD_SAT_CONSTRAINT (model1, x, NE_EXPR, int_42); | |
7022 | ADD_SAT_CONSTRAINT (model1, y, NE_EXPR, int_0); | |
7023 | ASSERT_NE (model0, model1); | |
7024 | ASSERT_CONDITION_TRUE (model1, x, NE_EXPR, int_42); | |
7025 | ASSERT_CONDITION_TRUE (model1, y, NE_EXPR, int_0); | |
7026 | ||
7027 | purge_stats stats; | |
7028 | model1.get_constraints ()->purge (purge_all_svalue_ids (), &stats); | |
7029 | ASSERT_CONDITION_UNKNOWN (model1, x, NE_EXPR, int_42); | |
7030 | ASSERT_CONDITION_UNKNOWN (model1, y, NE_EXPR, int_0); | |
7031 | } | |
7032 | ||
7033 | } | |
7034 | ||
7035 | /* Test that region_model::purge_unused_svalues works as expected. */ | |
7036 | ||
7037 | static void | |
7038 | test_purge_unused_svalues () | |
7039 | { | |
7040 | tree int_42 = build_int_cst (integer_type_node, 42); | |
7041 | tree int_0 = build_int_cst (integer_type_node, 0); | |
7042 | tree x = build_global_decl ("x", integer_type_node); | |
7043 | tree y = build_global_decl ("y", integer_type_node); | |
7044 | ||
7045 | test_region_model_context ctxt; | |
7046 | region_model model; | |
7047 | model.set_to_new_unknown_value (model.get_lvalue (x, &ctxt), TREE_TYPE (x), | |
7048 | &ctxt); | |
7049 | model.set_to_new_unknown_value (model.get_lvalue (x, &ctxt), TREE_TYPE (x), | |
7050 | &ctxt); | |
7051 | model.set_to_new_unknown_value (model.get_lvalue (x, &ctxt), TREE_TYPE (x), | |
7052 | &ctxt); | |
7053 | model.add_constraint (x, NE_EXPR, int_42, &ctxt); | |
7054 | ||
7055 | model.set_value (model.get_lvalue (x, &ctxt), | |
7056 | model.get_rvalue (int_42, &ctxt), | |
7057 | &ctxt); | |
7058 | model.add_constraint (y, GT_EXPR, int_0, &ctxt); | |
7059 | ||
7060 | /* The redundant unknown values should have been purged. */ | |
7061 | purge_stats purged; | |
7062 | model.purge_unused_svalues (&purged, NULL); | |
7063 | ASSERT_EQ (purged.m_num_svalues, 3); | |
7064 | ||
7065 | /* and the redundant constraint on an old, unknown value for x should | |
7066 | have been purged. */ | |
7067 | ASSERT_EQ (purged.m_num_equiv_classes, 1); | |
7068 | ASSERT_EQ (purged.m_num_constraints, 1); | |
7069 | ASSERT_EQ (model.get_constraints ()->m_constraints.length (), 2); | |
7070 | ||
7071 | /* ...but we should still have x == 42. */ | |
7072 | ASSERT_EQ (model.eval_condition (x, EQ_EXPR, int_42, &ctxt), | |
7073 | tristate::TS_TRUE); | |
7074 | ||
7075 | /* ...and we should still have the constraint on y. */ | |
7076 | ASSERT_EQ (model.eval_condition (y, GT_EXPR, int_0, &ctxt), | |
7077 | tristate::TS_TRUE); | |
7078 | ||
7079 | ASSERT_EQ (ctxt.get_num_diagnostics (), 0); | |
7080 | } | |
7081 | ||
7082 | /* Verify that simple assignments work as expected. */ | |
7083 | ||
7084 | static void | |
7085 | test_assignment () | |
7086 | { | |
7087 | tree int_0 = build_int_cst (integer_type_node, 0); | |
7088 | tree x = build_global_decl ("x", integer_type_node); | |
7089 | tree y = build_global_decl ("y", integer_type_node); | |
7090 | ||
7091 | /* "x == 0", then use of y, then "y = 0;". */ | |
7092 | region_model model; | |
7093 | ADD_SAT_CONSTRAINT (model, x, EQ_EXPR, int_0); | |
7094 | ASSERT_CONDITION_UNKNOWN (model, y, EQ_EXPR, int_0); | |
7095 | model.set_value (model.get_lvalue (y, NULL), | |
7096 | model.get_rvalue (int_0, NULL), | |
7097 | NULL); | |
7098 | ASSERT_CONDITION_TRUE (model, y, EQ_EXPR, int_0); | |
7099 | ASSERT_CONDITION_TRUE (model, y, EQ_EXPR, x); | |
7100 | ||
7101 | ASSERT_DUMP_EQ (model, true, "y: 0, {x}: unknown, x == y"); | |
7102 | } | |
7103 | ||
7104 | /* Verify the details of pushing and popping stack frames. */ | |
7105 | ||
7106 | static void | |
7107 | test_stack_frames () | |
7108 | { | |
7109 | tree int_42 = build_int_cst (integer_type_node, 42); | |
7110 | tree int_10 = build_int_cst (integer_type_node, 10); | |
7111 | tree int_5 = build_int_cst (integer_type_node, 5); | |
7112 | tree int_0 = build_int_cst (integer_type_node, 0); | |
7113 | ||
7114 | auto_vec <tree> param_types; | |
7115 | tree parent_fndecl = make_fndecl (integer_type_node, | |
7116 | "parent_fn", | |
7117 | param_types); | |
7118 | allocate_struct_function (parent_fndecl, true); | |
7119 | ||
7120 | tree child_fndecl = make_fndecl (integer_type_node, | |
7121 | "child_fn", | |
7122 | param_types); | |
7123 | allocate_struct_function (child_fndecl, true); | |
7124 | ||
7125 | /* "a" and "b" in the parent frame. */ | |
7126 | tree a = build_decl (UNKNOWN_LOCATION, PARM_DECL, | |
7127 | get_identifier ("a"), | |
7128 | integer_type_node); | |
7129 | tree b = build_decl (UNKNOWN_LOCATION, PARM_DECL, | |
7130 | get_identifier ("b"), | |
7131 | integer_type_node); | |
7132 | /* "x" and "y" in a child frame. */ | |
7133 | tree x = build_decl (UNKNOWN_LOCATION, PARM_DECL, | |
7134 | get_identifier ("x"), | |
7135 | integer_type_node); | |
7136 | tree y = build_decl (UNKNOWN_LOCATION, PARM_DECL, | |
7137 | get_identifier ("y"), | |
7138 | integer_type_node); | |
7139 | ||
7140 | /* "p" global. */ | |
7141 | tree p = build_global_decl ("p", ptr_type_node); | |
7142 | ||
7143 | /* "q" global. */ | |
7144 | tree q = build_global_decl ("q", ptr_type_node); | |
7145 | ||
7146 | test_region_model_context ctxt; | |
7147 | region_model model; | |
7148 | ||
7149 | /* Push stack frame for "parent_fn". */ | |
7150 | region_id parent_frame_rid | |
7151 | = model.push_frame (DECL_STRUCT_FUNCTION (parent_fndecl), NULL, &ctxt); | |
7152 | ASSERT_EQ (model.get_current_frame_id (), parent_frame_rid); | |
7153 | region_id a_in_parent_rid = model.get_lvalue (a, &ctxt); | |
7154 | model.set_value (a_in_parent_rid, model.get_rvalue (int_42, &ctxt), &ctxt); | |
7155 | model.set_to_new_unknown_value (model.get_lvalue (b, &ctxt), | |
7156 | integer_type_node, &ctxt); | |
7157 | model.add_constraint (b, LT_EXPR, int_10, &ctxt); | |
7158 | ASSERT_EQ (model.eval_condition (b, LT_EXPR, int_10, &ctxt), | |
7159 | tristate (tristate::TS_TRUE)); | |
7160 | ||
7161 | /* Push stack frame for "child_fn". */ | |
7162 | region_id child_frame_rid | |
7163 | = model.push_frame (DECL_STRUCT_FUNCTION (child_fndecl), NULL, &ctxt); | |
7164 | ASSERT_EQ (model.get_current_frame_id (), child_frame_rid); | |
7165 | region_id x_in_child_rid = model.get_lvalue (x, &ctxt); | |
7166 | model.set_value (x_in_child_rid, model.get_rvalue (int_0, &ctxt), &ctxt); | |
7167 | model.set_to_new_unknown_value (model.get_lvalue (y, &ctxt), | |
7168 | integer_type_node, &ctxt); | |
7169 | model.add_constraint (y, NE_EXPR, int_5, &ctxt); | |
7170 | ASSERT_EQ (model.eval_condition (y, NE_EXPR, int_5, &ctxt), | |
7171 | tristate (tristate::TS_TRUE)); | |
7172 | ||
7173 | /* Point a global pointer at a local in the child frame: p = &x. */ | |
7174 | region_id p_in_globals_rid = model.get_lvalue (p, &ctxt); | |
7175 | model.set_value (p_in_globals_rid, | |
7176 | model.get_or_create_ptr_svalue (ptr_type_node, | |
7177 | x_in_child_rid), | |
7178 | &ctxt); | |
7179 | ||
7180 | /* Point another global pointer at p: q = &p. */ | |
7181 | region_id q_in_globals_rid = model.get_lvalue (q, &ctxt); | |
7182 | model.set_value (q_in_globals_rid, | |
7183 | model.get_or_create_ptr_svalue (ptr_type_node, | |
7184 | p_in_globals_rid), | |
7185 | &ctxt); | |
7186 | ||
7187 | /* Test get_descendents. */ | |
7188 | region_id_set descendents (&model); | |
7189 | model.get_descendents (child_frame_rid, &descendents, region_id::null ()); | |
7190 | ASSERT_TRUE (descendents.region_p (child_frame_rid)); | |
7191 | ASSERT_TRUE (descendents.region_p (x_in_child_rid)); | |
7192 | ASSERT_FALSE (descendents.region_p (a_in_parent_rid)); | |
7193 | ASSERT_EQ (descendents.num_regions (), 3); | |
7194 | #if 0 | |
7195 | auto_vec<region_id> test_vec; | |
7196 | for (region_id_set::iterator_t iter = descendents.begin (); | |
7197 | iter != descendents.end (); | |
7198 | ++iter) | |
7199 | test_vec.safe_push (*iter); | |
7200 | gcc_unreachable (); // TODO | |
7201 | //ASSERT_EQ (); | |
7202 | #endif | |
7203 | ||
7204 | ASSERT_DUMP_EQ (model, true, | |
7205 | "x: 0, {y}: unknown, p: &x, q: &p, b < 10, y != 5"); | |
7206 | ||
7207 | /* Pop the "child_fn" frame from the stack. */ | |
7208 | purge_stats purged; | |
7209 | model.pop_frame (true, &purged, &ctxt); | |
7210 | ||
7211 | /* We should have purged the unknown values for x and y. */ | |
7212 | ASSERT_EQ (purged.m_num_svalues, 2); | |
7213 | ||
7214 | /* We should have purged the frame region and the regions for x and y. */ | |
7215 | ASSERT_EQ (purged.m_num_regions, 3); | |
7216 | ||
7217 | /* We should have purged the constraint on y. */ | |
7218 | ASSERT_EQ (purged.m_num_equiv_classes, 1); | |
7219 | ASSERT_EQ (purged.m_num_constraints, 1); | |
7220 | ||
7221 | /* Verify that p (which was pointing at the local "x" in the popped | |
7222 | frame) has been poisoned. */ | |
7223 | svalue *new_p_sval = model.get_svalue (model.get_rvalue (p, &ctxt)); | |
7224 | ASSERT_EQ (new_p_sval->get_kind (), SK_POISONED); | |
7225 | ASSERT_EQ (new_p_sval->dyn_cast_poisoned_svalue ()->get_poison_kind (), | |
7226 | POISON_KIND_POPPED_STACK); | |
7227 | ||
7228 | /* Verify that q still points to p, in spite of the region | |
7229 | renumbering. */ | |
7230 | svalue *new_q_sval = model.get_svalue (model.get_rvalue (q, &ctxt)); | |
7231 | ASSERT_EQ (new_q_sval->get_kind (), SK_REGION); | |
7232 | ASSERT_EQ (new_q_sval->dyn_cast_region_svalue ()->get_pointee (), | |
7233 | model.get_lvalue (p, &ctxt)); | |
7234 | ||
7235 | /* Verify that top of stack has been updated. */ | |
7236 | ASSERT_EQ (model.get_current_frame_id (), parent_frame_rid); | |
7237 | ||
7238 | /* Verify locals in parent frame. */ | |
7239 | /* Verify "a" still has its value. */ | |
7240 | svalue *new_a_sval = model.get_svalue (model.get_rvalue (a, &ctxt)); | |
7241 | ASSERT_EQ (new_a_sval->get_kind (), SK_CONSTANT); | |
7242 | ASSERT_EQ (new_a_sval->dyn_cast_constant_svalue ()->get_constant (), | |
7243 | int_42); | |
7244 | /* Verify "b" still has its constraint. */ | |
7245 | ASSERT_EQ (model.eval_condition (b, LT_EXPR, int_10, &ctxt), | |
7246 | tristate (tristate::TS_TRUE)); | |
7247 | } | |
7248 | ||
7249 | /* Verify that get_representative_path_var works as expected, that | |
7250 | we can map from region ids to parms and back within a recursive call | |
7251 | stack. */ | |
7252 | ||
7253 | static void | |
7254 | test_get_representative_path_var () | |
7255 | { | |
7256 | auto_vec <tree> param_types; | |
7257 | tree fndecl = make_fndecl (integer_type_node, | |
7258 | "factorial", | |
7259 | param_types); | |
7260 | allocate_struct_function (fndecl, true); | |
7261 | ||
7262 | /* Parm "n". */ | |
7263 | tree n = build_decl (UNKNOWN_LOCATION, PARM_DECL, | |
7264 | get_identifier ("n"), | |
7265 | integer_type_node); | |
7266 | ||
7267 | region_model model; | |
7268 | ||
7269 | /* Push 5 stack frames for "factorial", each with a param */ | |
7270 | auto_vec<region_id> parm_rids; | |
7271 | auto_vec<svalue_id> parm_sids; | |
7272 | for (int depth = 0; depth < 5; depth++) | |
7273 | { | |
7274 | region_id frame_rid | |
7275 | = model.push_frame (DECL_STRUCT_FUNCTION (fndecl), NULL, NULL); | |
7276 | region_id rid_n = model.get_lvalue (path_var (n, depth), NULL); | |
7277 | parm_rids.safe_push (rid_n); | |
7278 | ||
7279 | ASSERT_EQ (model.get_region (rid_n)->get_parent (), frame_rid); | |
7280 | ||
7281 | svalue_id sid_n | |
7282 | = model.set_to_new_unknown_value (rid_n, integer_type_node, NULL); | |
7283 | parm_sids.safe_push (sid_n); | |
7284 | } | |
7285 | ||
7286 | /* Verify that we can recognize that the regions are the parms, | |
7287 | at every depth. */ | |
7288 | for (int depth = 0; depth < 5; depth++) | |
7289 | { | |
7290 | ASSERT_EQ (model.get_representative_path_var (parm_rids[depth]), | |
7291 | path_var (n, depth)); | |
7292 | /* ...and that we can lookup lvalues for locals for all frames, | |
7293 | not just the top. */ | |
7294 | ASSERT_EQ (model.get_lvalue (path_var (n, depth), NULL), | |
7295 | parm_rids[depth]); | |
7296 | /* ...and that we can locate the svalues. */ | |
7297 | auto_vec<path_var> pvs; | |
7298 | model.get_path_vars_for_svalue (parm_sids[depth], &pvs); | |
7299 | ASSERT_EQ (pvs.length (), 1); | |
7300 | ASSERT_EQ (pvs[0], path_var (n, depth)); | |
7301 | } | |
7302 | } | |
7303 | ||
7304 | /* Verify that the core regions within a region_model are in a consistent | |
7305 | order after canonicalization. */ | |
7306 | ||
7307 | static void | |
7308 | test_canonicalization_1 () | |
7309 | { | |
7310 | region_model model0; | |
7311 | model0.get_root_region ()->ensure_stack_region (&model0); | |
7312 | model0.get_root_region ()->ensure_globals_region (&model0); | |
7313 | ||
7314 | region_model model1; | |
7315 | model1.get_root_region ()->ensure_globals_region (&model1); | |
7316 | model1.get_root_region ()->ensure_stack_region (&model1); | |
7317 | ||
7318 | model0.canonicalize (NULL); | |
7319 | model1.canonicalize (NULL); | |
7320 | ASSERT_EQ (model0, model1); | |
7321 | } | |
7322 | ||
7323 | /* Verify that region models for | |
7324 | x = 42; y = 113; | |
7325 | and | |
7326 | y = 113; x = 42; | |
7327 | are equal after canonicalization. */ | |
7328 | ||
7329 | static void | |
7330 | test_canonicalization_2 () | |
7331 | { | |
7332 | tree int_42 = build_int_cst (integer_type_node, 42); | |
7333 | tree int_113 = build_int_cst (integer_type_node, 113); | |
7334 | tree x = build_global_decl ("x", integer_type_node); | |
7335 | tree y = build_global_decl ("y", integer_type_node); | |
7336 | ||
7337 | region_model model0; | |
7338 | model0.set_value (model0.get_lvalue (x, NULL), | |
7339 | model0.get_rvalue (int_42, NULL), | |
7340 | NULL); | |
7341 | model0.set_value (model0.get_lvalue (y, NULL), | |
7342 | model0.get_rvalue (int_113, NULL), | |
7343 | NULL); | |
7344 | ||
7345 | region_model model1; | |
7346 | model1.set_value (model1.get_lvalue (y, NULL), | |
7347 | model1.get_rvalue (int_113, NULL), | |
7348 | NULL); | |
7349 | model1.set_value (model1.get_lvalue (x, NULL), | |
7350 | model1.get_rvalue (int_42, NULL), | |
7351 | NULL); | |
7352 | ||
7353 | model0.canonicalize (NULL); | |
7354 | model1.canonicalize (NULL); | |
7355 | ASSERT_EQ (model0, model1); | |
7356 | } | |
7357 | ||
7358 | /* Verify that constraints for | |
7359 | x > 3 && y > 42 | |
7360 | and | |
7361 | y > 42 && x > 3 | |
7362 | are equal after canonicalization. */ | |
7363 | ||
7364 | static void | |
7365 | test_canonicalization_3 () | |
7366 | { | |
7367 | tree int_3 = build_int_cst (integer_type_node, 3); | |
7368 | tree int_42 = build_int_cst (integer_type_node, 42); | |
7369 | tree x = build_global_decl ("x", integer_type_node); | |
7370 | tree y = build_global_decl ("y", integer_type_node); | |
7371 | ||
7372 | region_model model0; | |
7373 | model0.add_constraint (x, GT_EXPR, int_3, NULL); | |
7374 | model0.add_constraint (y, GT_EXPR, int_42, NULL); | |
7375 | ||
7376 | region_model model1; | |
7377 | model1.add_constraint (y, GT_EXPR, int_42, NULL); | |
7378 | model1.add_constraint (x, GT_EXPR, int_3, NULL); | |
7379 | ||
7380 | model0.canonicalize (NULL); | |
7381 | model1.canonicalize (NULL); | |
7382 | ASSERT_EQ (model0, model1); | |
7383 | } | |
7384 | ||
7385 | /* Assert that if we have two region_model instances | |
7386 | with values VAL_A and VAL_B for EXPR that they are | |
7387 | mergable. Write the merged model to *OUT_MERGED_MODEL, | |
7388 | and the merged svalue ptr to *OUT_MERGED_SVALUE. | |
7389 | If VAL_A or VAL_B are NULL_TREE, don't populate EXPR | |
7390 | for that region_model. */ | |
7391 | ||
7392 | static void | |
7393 | assert_region_models_merge (tree expr, tree val_a, tree val_b, | |
7394 | region_model *out_merged_model, | |
7395 | svalue **out_merged_svalue) | |
7396 | { | |
7397 | test_region_model_context ctxt; | |
7398 | region_model model0; | |
7399 | region_model model1; | |
7400 | if (val_a) | |
7401 | model0.set_value (model0.get_lvalue (expr, &ctxt), | |
7402 | model0.get_rvalue (val_a, &ctxt), | |
7403 | &ctxt); | |
7404 | if (val_b) | |
7405 | model1.set_value (model1.get_lvalue (expr, &ctxt), | |
7406 | model1.get_rvalue (val_b, &ctxt), | |
7407 | &ctxt); | |
7408 | ||
7409 | /* They should be mergeable. */ | |
7410 | ASSERT_TRUE (model0.can_merge_with_p (model1, out_merged_model)); | |
7411 | ||
7412 | svalue_id merged_svalue_sid = out_merged_model->get_rvalue (expr, &ctxt); | |
7413 | *out_merged_svalue = out_merged_model->get_svalue (merged_svalue_sid); | |
7414 | } | |
7415 | ||
7416 | /* Verify that we can merge region_model instances. */ | |
7417 | ||
7418 | static void | |
7419 | test_state_merging () | |
7420 | { | |
7421 | tree int_42 = build_int_cst (integer_type_node, 42); | |
7422 | tree int_113 = build_int_cst (integer_type_node, 113); | |
7423 | tree x = build_global_decl ("x", integer_type_node); | |
7424 | tree y = build_global_decl ("y", integer_type_node); | |
7425 | tree z = build_global_decl ("z", integer_type_node); | |
7426 | tree p = build_global_decl ("p", ptr_type_node); | |
7427 | ||
7428 | tree addr_of_y = build1 (ADDR_EXPR, ptr_type_node, y); | |
7429 | tree addr_of_z = build1 (ADDR_EXPR, ptr_type_node, z); | |
7430 | ||
7431 | auto_vec <tree> param_types; | |
7432 | tree test_fndecl = make_fndecl (integer_type_node, "test_fn", param_types); | |
7433 | allocate_struct_function (test_fndecl, true); | |
7434 | ||
7435 | /* Param "a". */ | |
7436 | tree a = build_decl (UNKNOWN_LOCATION, PARM_DECL, | |
7437 | get_identifier ("a"), | |
7438 | integer_type_node); | |
7439 | tree addr_of_a = build1 (ADDR_EXPR, ptr_type_node, a); | |
7440 | ||
7441 | { | |
7442 | region_model model0; | |
7443 | region_model model1; | |
7444 | region_model merged; | |
7445 | /* Verify empty models can be merged. */ | |
7446 | ASSERT_TRUE (model0.can_merge_with_p (model1, &merged)); | |
7447 | ASSERT_EQ (model0, merged); | |
7448 | } | |
7449 | ||
7450 | /* Verify that we can merge two contradictory constraints on the | |
7451 | value for a global. */ | |
7452 | /* TODO: verify that the merged model doesn't have a value for | |
7453 | the global */ | |
7454 | { | |
7455 | region_model model0; | |
7456 | region_model model1; | |
7457 | region_model merged; | |
7458 | test_region_model_context ctxt; | |
7459 | model0.add_constraint (x, EQ_EXPR, int_42, &ctxt); | |
7460 | model1.add_constraint (x, EQ_EXPR, int_113, &ctxt); | |
7461 | ASSERT_TRUE (model0.can_merge_with_p (model1, &merged)); | |
7462 | ASSERT_NE (model0, merged); | |
7463 | ASSERT_NE (model1, merged); | |
7464 | } | |
7465 | ||
7466 | /* Verify handling of a PARM_DECL. */ | |
7467 | { | |
7468 | test_region_model_context ctxt; | |
7469 | region_model model0; | |
7470 | region_model model1; | |
7471 | ASSERT_EQ (model0.get_stack_depth (), 0); | |
7472 | model0.push_frame (DECL_STRUCT_FUNCTION (test_fndecl), NULL, &ctxt); | |
7473 | ASSERT_EQ (model0.get_stack_depth (), 1); | |
7474 | ASSERT_EQ (model0.get_function_at_depth (0), | |
7475 | DECL_STRUCT_FUNCTION (test_fndecl)); | |
7476 | model1.push_frame (DECL_STRUCT_FUNCTION (test_fndecl), NULL, &ctxt); | |
7477 | ||
7478 | svalue_id sid_a | |
7479 | = model0.set_to_new_unknown_value (model0.get_lvalue (a, &ctxt), | |
7480 | integer_type_node, &ctxt); | |
7481 | model1.set_to_new_unknown_value (model1.get_lvalue (a, &ctxt), | |
7482 | integer_type_node, &ctxt); | |
7483 | ASSERT_EQ (model0, model1); | |
7484 | ||
7485 | /* Check that get_value_by_name works for locals. */ | |
7486 | ASSERT_EQ (model0.get_value_by_name ("a"), sid_a); | |
7487 | ||
7488 | /* They should be mergeable, and the result should be the same. */ | |
7489 | region_model merged; | |
7490 | ASSERT_TRUE (model0.can_merge_with_p (model1, &merged)); | |
7491 | ASSERT_EQ (model0, merged); | |
7492 | /* In particular, there should be an unknown value for "a". */ | |
7493 | svalue *merged_a_sval = merged.get_svalue (merged.get_rvalue (a, &ctxt)); | |
7494 | ASSERT_EQ (merged_a_sval->get_kind (), SK_UNKNOWN); | |
7495 | } | |
7496 | ||
7497 | /* Verify handling of a global. */ | |
7498 | { | |
7499 | test_region_model_context ctxt; | |
7500 | region_model model0; | |
7501 | region_model model1; | |
7502 | svalue_id sid_x | |
7503 | = model0.set_to_new_unknown_value (model0.get_lvalue (x, &ctxt), | |
7504 | integer_type_node, &ctxt); | |
7505 | model1.set_to_new_unknown_value (model1.get_lvalue (x, &ctxt), | |
7506 | integer_type_node, &ctxt); | |
7507 | ASSERT_EQ (model0, model1); | |
7508 | ||
7509 | /* Check that get_value_by_name works for globals. */ | |
7510 | ASSERT_EQ (model0.get_value_by_name ("x"), sid_x); | |
7511 | ||
7512 | /* They should be mergeable, and the result should be the same. */ | |
7513 | region_model merged; | |
7514 | ASSERT_TRUE (model0.can_merge_with_p (model1, &merged)); | |
7515 | ASSERT_EQ (model0, merged); | |
7516 | /* In particular, there should be an unknown value for "x". */ | |
7517 | svalue *merged_x_sval = merged.get_svalue (merged.get_rvalue (x, &ctxt)); | |
7518 | ASSERT_EQ (merged_x_sval->get_kind (), SK_UNKNOWN); | |
7519 | } | |
7520 | ||
7521 | /* Use global-handling to verify various combinations of values. */ | |
7522 | ||
7523 | /* Two equal constant values. */ | |
7524 | { | |
7525 | region_model merged; | |
7526 | svalue *merged_x_sval; | |
7527 | assert_region_models_merge (x, int_42, int_42, &merged, &merged_x_sval); | |
7528 | ||
7529 | /* In particular, there should be a constant value for "x". */ | |
7530 | ASSERT_EQ (merged_x_sval->get_kind (), SK_CONSTANT); | |
7531 | ASSERT_EQ (merged_x_sval->dyn_cast_constant_svalue ()->get_constant (), | |
7532 | int_42); | |
7533 | } | |
7534 | ||
7535 | /* Two non-equal constant values. */ | |
7536 | { | |
7537 | region_model merged; | |
7538 | svalue *merged_x_sval; | |
7539 | assert_region_models_merge (x, int_42, int_113, &merged, &merged_x_sval); | |
7540 | ||
7541 | /* In particular, there should be an unknown value for "x". */ | |
7542 | ASSERT_EQ (merged_x_sval->get_kind (), SK_UNKNOWN); | |
7543 | } | |
7544 | ||
7545 | /* Uninit and constant. */ | |
7546 | { | |
7547 | region_model merged; | |
7548 | svalue *merged_x_sval; | |
7549 | assert_region_models_merge (x, NULL_TREE, int_113, &merged, &merged_x_sval); | |
7550 | ||
7551 | /* In particular, there should be an unknown value for "x". */ | |
7552 | ASSERT_EQ (merged_x_sval->get_kind (), SK_UNKNOWN); | |
7553 | } | |
7554 | ||
7555 | /* Constant and uninit. */ | |
7556 | { | |
7557 | region_model merged; | |
7558 | svalue *merged_x_sval; | |
7559 | assert_region_models_merge (x, int_42, NULL_TREE, &merged, &merged_x_sval); | |
7560 | ||
7561 | /* In particular, there should be an unknown value for "x". */ | |
7562 | ASSERT_EQ (merged_x_sval->get_kind (), SK_UNKNOWN); | |
7563 | } | |
7564 | ||
7565 | /* Unknown and constant. */ | |
7566 | // TODO | |
7567 | ||
7568 | /* Pointers: NULL and NULL. */ | |
7569 | // TODO | |
7570 | ||
7571 | /* Pointers: NULL and non-NULL. */ | |
7572 | // TODO | |
7573 | ||
7574 | /* Pointers: non-NULL and non-NULL: ptr to a local. */ | |
7575 | { | |
7576 | region_model model0; | |
7577 | model0.push_frame (DECL_STRUCT_FUNCTION (test_fndecl), NULL, NULL); | |
7578 | model0.set_to_new_unknown_value (model0.get_lvalue (a, NULL), | |
7579 | integer_type_node, NULL); | |
7580 | model0.set_value (model0.get_lvalue (p, NULL), | |
7581 | model0.get_rvalue (addr_of_a, NULL), NULL); | |
7582 | ||
7583 | region_model model1 (model0); | |
7584 | ASSERT_EQ (model0, model1); | |
7585 | ||
7586 | /* They should be mergeable, and the result should be the same. */ | |
7587 | region_model merged; | |
7588 | ASSERT_TRUE (model0.can_merge_with_p (model1, &merged)); | |
7589 | ASSERT_EQ (model0, merged); | |
7590 | } | |
7591 | ||
7592 | /* Pointers: non-NULL and non-NULL: ptr to a global. */ | |
7593 | { | |
7594 | region_model merged; | |
7595 | /* p == &y in both input models. */ | |
7596 | svalue *merged_p_sval; | |
7597 | assert_region_models_merge (p, addr_of_y, addr_of_y, &merged, | |
7598 | &merged_p_sval); | |
7599 | ||
7600 | /* We should get p == &y in the merged model. */ | |
7601 | ASSERT_EQ (merged_p_sval->get_kind (), SK_REGION); | |
7602 | region_svalue *merged_p_ptr = merged_p_sval->dyn_cast_region_svalue (); | |
7603 | region_id merged_p_star_rid = merged_p_ptr->get_pointee (); | |
7604 | ASSERT_EQ (merged_p_star_rid, merged.get_lvalue (y, NULL)); | |
7605 | } | |
7606 | ||
7607 | /* Pointers: non-NULL ptrs to different globals: should be unknown. */ | |
7608 | { | |
7609 | region_model merged; | |
7610 | /* x == &y vs x == &z in the input models. */ | |
7611 | svalue *merged_x_sval; | |
7612 | assert_region_models_merge (x, addr_of_y, addr_of_z, &merged, | |
7613 | &merged_x_sval); | |
7614 | ||
7615 | /* We should get x == unknown in the merged model. */ | |
7616 | ASSERT_EQ (merged_x_sval->get_kind (), SK_UNKNOWN); | |
7617 | } | |
7618 | ||
7619 | /* Pointers: non-NULL and non-NULL: ptr to a heap region. */ | |
7620 | { | |
7621 | test_region_model_context ctxt; | |
7622 | region_model model0; | |
7623 | region_id new_rid = model0.add_new_malloc_region (); | |
7624 | svalue_id ptr_sid | |
7625 | = model0.get_or_create_ptr_svalue (ptr_type_node, new_rid); | |
7626 | model0.set_value (model0.get_lvalue (p, &ctxt), | |
7627 | ptr_sid, &ctxt); | |
7628 | model0.canonicalize (&ctxt); | |
7629 | ||
7630 | region_model model1 (model0); | |
7631 | ||
7632 | ASSERT_EQ (model0, model1); | |
7633 | ||
7634 | region_model merged; | |
7635 | ASSERT_TRUE (model0.can_merge_with_p (model1, &merged)); | |
7636 | ||
7637 | merged.canonicalize (&ctxt); | |
7638 | ||
7639 | /* The merged model ought to be identical (after canonicalization, | |
7640 | at least). */ | |
7641 | ASSERT_EQ (model0, merged); | |
7642 | } | |
7643 | ||
7644 | /* Two regions sharing the same unknown svalue should continue sharing | |
7645 | an unknown svalue after self-merger. */ | |
7646 | { | |
7647 | test_region_model_context ctxt; | |
7648 | region_model model0; | |
7649 | svalue_id sid | |
7650 | = model0.set_to_new_unknown_value (model0.get_lvalue (x, &ctxt), | |
7651 | integer_type_node, &ctxt); | |
7652 | model0.set_value (model0.get_lvalue (y, &ctxt), sid, &ctxt); | |
7653 | region_model model1 (model0); | |
7654 | ||
7655 | /* They should be mergeable, and the result should be the same. */ | |
7656 | region_model merged; | |
7657 | ASSERT_TRUE (model0.can_merge_with_p (model1, &merged)); | |
7658 | ASSERT_EQ (model0, merged); | |
7659 | ||
7660 | /* In particular, we should have x == y. */ | |
7661 | ASSERT_EQ (merged.eval_condition (x, EQ_EXPR, y, &ctxt), | |
7662 | tristate (tristate::TS_TRUE)); | |
7663 | } | |
7664 | ||
7665 | #if 0 | |
7666 | { | |
7667 | region_model model0; | |
7668 | region_model model1; | |
7669 | test_region_model_context ctxt; | |
7670 | model0.add_constraint (x, EQ_EXPR, int_42, &ctxt); | |
7671 | model1.add_constraint (x, NE_EXPR, int_42, &ctxt); | |
7672 | ASSERT_TRUE (model0.can_merge_with_p (model1)); | |
7673 | } | |
7674 | ||
7675 | { | |
7676 | region_model model0; | |
7677 | region_model model1; | |
7678 | test_region_model_context ctxt; | |
7679 | model0.add_constraint (x, EQ_EXPR, int_42, &ctxt); | |
7680 | model1.add_constraint (x, NE_EXPR, int_42, &ctxt); | |
7681 | model1.add_constraint (x, EQ_EXPR, int_113, &ctxt); | |
7682 | ASSERT_TRUE (model0.can_merge_with_p (model1)); | |
7683 | } | |
7684 | #endif | |
7685 | ||
7686 | // TODO: what can't we merge? need at least one such test | |
7687 | ||
7688 | /* TODO: various things | |
7689 | - heap regions | |
7690 | - value merging: | |
7691 | - every combination, but in particular | |
7692 | - pairs of regions | |
7693 | */ | |
7694 | ||
7695 | /* Views. */ | |
7696 | { | |
7697 | test_region_model_context ctxt; | |
7698 | region_model model0; | |
7699 | ||
7700 | region_id x_rid = model0.get_lvalue (x, &ctxt); | |
7701 | region_id x_as_ptr = model0.get_or_create_view (x_rid, ptr_type_node); | |
7702 | model0.set_value (x_as_ptr, model0.get_rvalue (addr_of_y, &ctxt), &ctxt); | |
7703 | ||
7704 | region_model model1 (model0); | |
7705 | ASSERT_EQ (model1, model0); | |
7706 | ||
7707 | /* They should be mergeable, and the result should be the same. */ | |
7708 | region_model merged; | |
7709 | ASSERT_TRUE (model0.can_merge_with_p (model1, &merged)); | |
7710 | } | |
7711 | } | |
7712 | ||
7713 | /* Verify that constraints are correctly merged when merging region_model | |
7714 | instances. */ | |
7715 | ||
7716 | static void | |
7717 | test_constraint_merging () | |
7718 | { | |
7719 | tree int_0 = build_int_cst (integer_type_node, 0); | |
7720 | tree int_5 = build_int_cst (integer_type_node, 5); | |
7721 | tree x = build_global_decl ("x", integer_type_node); | |
7722 | tree y = build_global_decl ("y", integer_type_node); | |
7723 | tree z = build_global_decl ("z", integer_type_node); | |
7724 | tree n = build_global_decl ("n", integer_type_node); | |
7725 | ||
7726 | test_region_model_context ctxt; | |
7727 | ||
7728 | /* model0: 0 <= (x == y) < n. */ | |
7729 | region_model model0; | |
7730 | model0.set_to_new_unknown_value (model0.get_lvalue (x, &ctxt), | |
7731 | integer_type_node, &ctxt); | |
7732 | model0.add_constraint (x, EQ_EXPR, y, &ctxt); | |
7733 | model0.add_constraint (x, GE_EXPR, int_0, NULL); | |
7734 | model0.add_constraint (x, LT_EXPR, n, NULL); | |
7735 | ||
7736 | /* model1: z != 5 && (0 <= x < n). */ | |
7737 | region_model model1; | |
7738 | model1.set_to_new_unknown_value (model1.get_lvalue (x, &ctxt), | |
7739 | integer_type_node, &ctxt); | |
7740 | model1.add_constraint (z, NE_EXPR, int_5, NULL); | |
7741 | model1.add_constraint (x, GE_EXPR, int_0, NULL); | |
7742 | model1.add_constraint (x, LT_EXPR, n, NULL); | |
7743 | ||
7744 | /* They should be mergeable; the merged constraints should | |
7745 | be: (0 <= x < n). */ | |
7746 | region_model merged; | |
7747 | ASSERT_TRUE (model0.can_merge_with_p (model1, &merged)); | |
7748 | ||
7749 | ASSERT_EQ (merged.eval_condition (x, GE_EXPR, int_0, &ctxt), | |
7750 | tristate (tristate::TS_TRUE)); | |
7751 | ASSERT_EQ (merged.eval_condition (x, LT_EXPR, n, &ctxt), | |
7752 | tristate (tristate::TS_TRUE)); | |
7753 | ||
7754 | ASSERT_EQ (merged.eval_condition (z, NE_EXPR, int_5, &ctxt), | |
7755 | tristate (tristate::TS_UNKNOWN)); | |
7756 | ASSERT_EQ (merged.eval_condition (x, LT_EXPR, y, &ctxt), | |
7757 | tristate (tristate::TS_UNKNOWN)); | |
7758 | } | |
7759 | ||
7760 | /* Run all of the selftests within this file. */ | |
7761 | ||
7762 | void | |
7763 | analyzer_region_model_cc_tests () | |
7764 | { | |
7765 | test_dump (); | |
7766 | test_unique_constants (); | |
7767 | test_svalue_equality (); | |
7768 | test_region_equality (); | |
7769 | test_purging_by_criteria (); | |
7770 | test_purge_unused_svalues (); | |
7771 | test_assignment (); | |
7772 | test_stack_frames (); | |
7773 | test_get_representative_path_var (); | |
7774 | test_canonicalization_1 (); | |
7775 | test_canonicalization_2 (); | |
7776 | test_canonicalization_3 (); | |
7777 | test_state_merging (); | |
7778 | test_constraint_merging (); | |
7779 | } | |
7780 | ||
7781 | } // namespace selftest | |
7782 | ||
7783 | #endif /* CHECKING_P */ | |
7784 | ||
7785 | #endif /* #if ENABLE_ANALYZER */ |