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757bf1df | 1 | /* Classes for modeling the state of memory. |
83ffe9cd | 2 | Copyright (C) 2019-2023 Free Software Foundation, Inc. |
757bf1df DM |
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" | |
c81b60b8 | 22 | #define INCLUDE_MEMORY |
757bf1df DM |
23 | #include "system.h" |
24 | #include "coretypes.h" | |
6341f14e | 25 | #include "make-unique.h" |
757bf1df DM |
26 | #include "tree.h" |
27 | #include "function.h" | |
28 | #include "basic-block.h" | |
29 | #include "gimple.h" | |
30 | #include "gimple-iterator.h" | |
7892ff37 | 31 | #include "diagnostic-core.h" |
757bf1df DM |
32 | #include "graphviz.h" |
33 | #include "options.h" | |
34 | #include "cgraph.h" | |
35 | #include "tree-dfa.h" | |
36 | #include "stringpool.h" | |
37 | #include "convert.h" | |
38 | #include "target.h" | |
39 | #include "fold-const.h" | |
40 | #include "tree-pretty-print.h" | |
41 | #include "diagnostic-color.h" | |
42 | #include "diagnostic-metadata.h" | |
ef7827b0 | 43 | #include "bitmap.h" |
757bf1df | 44 | #include "selftest.h" |
757bf1df DM |
45 | #include "analyzer/analyzer.h" |
46 | #include "analyzer/analyzer-logging.h" | |
47 | #include "ordered-hash-map.h" | |
48 | #include "options.h" | |
49 | #include "cgraph.h" | |
50 | #include "cfg.h" | |
757bf1df DM |
51 | #include "analyzer/supergraph.h" |
52 | #include "sbitmap.h" | |
808f4dfe DM |
53 | #include "analyzer/call-string.h" |
54 | #include "analyzer/program-point.h" | |
55 | #include "analyzer/store.h" | |
757bf1df DM |
56 | #include "analyzer/region-model.h" |
57 | #include "analyzer/constraint-manager.h" | |
58 | #include "diagnostic-event-id.h" | |
59 | #include "analyzer/sm.h" | |
60 | #include "diagnostic-event-id.h" | |
61 | #include "analyzer/sm.h" | |
62 | #include "analyzer/pending-diagnostic.h" | |
808f4dfe | 63 | #include "analyzer/region-model-reachability.h" |
757bf1df | 64 | #include "analyzer/analyzer-selftests.h" |
f573d351 | 65 | #include "analyzer/program-state.h" |
bfca9505 | 66 | #include "analyzer/call-summary.h" |
884d9141 | 67 | #include "stor-layout.h" |
c7e276b8 | 68 | #include "attribs.h" |
9a2c9579 | 69 | #include "tree-object-size.h" |
1e2fe671 DM |
70 | #include "gimple-ssa.h" |
71 | #include "tree-phinodes.h" | |
72 | #include "tree-ssa-operands.h" | |
73 | #include "ssa-iterators.h" | |
5fbcbcaf | 74 | #include "calls.h" |
e6c3bb37 | 75 | #include "is-a.h" |
c81b60b8 | 76 | #include "gcc-rich-location.h" |
f5758fe5 DM |
77 | #include "analyzer/checker-event.h" |
78 | #include "analyzer/checker-path.h" | |
b03a10b0 | 79 | #include "analyzer/feasible-graph.h" |
757bf1df DM |
80 | |
81 | #if ENABLE_ANALYZER | |
82 | ||
75038aa6 DM |
83 | namespace ana { |
84 | ||
757bf1df DM |
85 | /* Dump T to PP in language-independent form, for debugging/logging/dumping |
86 | purposes. */ | |
87 | ||
757bf1df | 88 | void |
808f4dfe | 89 | dump_tree (pretty_printer *pp, tree t) |
757bf1df | 90 | { |
808f4dfe | 91 | dump_generic_node (pp, t, 0, TDF_SLIM, 0); |
757bf1df DM |
92 | } |
93 | ||
808f4dfe DM |
94 | /* Dump T to PP in language-independent form in quotes, for |
95 | debugging/logging/dumping purposes. */ | |
757bf1df DM |
96 | |
97 | void | |
808f4dfe | 98 | dump_quoted_tree (pretty_printer *pp, tree t) |
757bf1df | 99 | { |
808f4dfe DM |
100 | pp_begin_quote (pp, pp_show_color (pp)); |
101 | dump_tree (pp, t); | |
102 | pp_end_quote (pp, pp_show_color (pp)); | |
757bf1df DM |
103 | } |
104 | ||
808f4dfe DM |
105 | /* Equivalent to pp_printf (pp, "%qT", t), to avoid nesting pp_printf |
106 | calls within other pp_printf calls. | |
757bf1df | 107 | |
808f4dfe DM |
108 | default_tree_printer handles 'T' and some other codes by calling |
109 | dump_generic_node (pp, t, 0, TDF_SLIM, 0); | |
110 | dump_generic_node calls pp_printf in various places, leading to | |
111 | garbled output. | |
757bf1df | 112 | |
808f4dfe DM |
113 | Ideally pp_printf could be made to be reentrant, but in the meantime |
114 | this function provides a workaround. */ | |
6969ac30 DM |
115 | |
116 | void | |
808f4dfe | 117 | print_quoted_type (pretty_printer *pp, tree t) |
6969ac30 | 118 | { |
808f4dfe DM |
119 | pp_begin_quote (pp, pp_show_color (pp)); |
120 | dump_generic_node (pp, t, 0, TDF_SLIM, 0); | |
121 | pp_end_quote (pp, pp_show_color (pp)); | |
6969ac30 DM |
122 | } |
123 | ||
d726a57b DM |
124 | /* class region_to_value_map. */ |
125 | ||
126 | /* Assignment operator for region_to_value_map. */ | |
127 | ||
128 | region_to_value_map & | |
129 | region_to_value_map::operator= (const region_to_value_map &other) | |
130 | { | |
131 | m_hash_map.empty (); | |
132 | for (auto iter : other.m_hash_map) | |
133 | { | |
134 | const region *reg = iter.first; | |
135 | const svalue *sval = iter.second; | |
136 | m_hash_map.put (reg, sval); | |
137 | } | |
138 | return *this; | |
139 | } | |
140 | ||
141 | /* Equality operator for region_to_value_map. */ | |
142 | ||
143 | bool | |
144 | region_to_value_map::operator== (const region_to_value_map &other) const | |
145 | { | |
146 | if (m_hash_map.elements () != other.m_hash_map.elements ()) | |
147 | return false; | |
148 | ||
149 | for (auto iter : *this) | |
150 | { | |
151 | const region *reg = iter.first; | |
152 | const svalue *sval = iter.second; | |
153 | const svalue * const *other_slot = other.get (reg); | |
154 | if (other_slot == NULL) | |
155 | return false; | |
156 | if (sval != *other_slot) | |
157 | return false; | |
158 | } | |
159 | ||
160 | return true; | |
161 | } | |
162 | ||
163 | /* Dump this object to PP. */ | |
164 | ||
165 | void | |
166 | region_to_value_map::dump_to_pp (pretty_printer *pp, bool simple, | |
167 | bool multiline) const | |
168 | { | |
169 | auto_vec<const region *> regs; | |
170 | for (iterator iter = begin (); iter != end (); ++iter) | |
171 | regs.safe_push ((*iter).first); | |
172 | regs.qsort (region::cmp_ptr_ptr); | |
173 | if (multiline) | |
174 | pp_newline (pp); | |
175 | else | |
176 | pp_string (pp, " {"); | |
177 | unsigned i; | |
178 | const region *reg; | |
179 | FOR_EACH_VEC_ELT (regs, i, reg) | |
180 | { | |
181 | if (multiline) | |
182 | pp_string (pp, " "); | |
183 | else if (i > 0) | |
184 | pp_string (pp, ", "); | |
185 | reg->dump_to_pp (pp, simple); | |
186 | pp_string (pp, ": "); | |
187 | const svalue *sval = *get (reg); | |
188 | sval->dump_to_pp (pp, true); | |
189 | if (multiline) | |
190 | pp_newline (pp); | |
191 | } | |
192 | if (!multiline) | |
193 | pp_string (pp, "}"); | |
194 | } | |
195 | ||
196 | /* Dump this object to stderr. */ | |
197 | ||
198 | DEBUG_FUNCTION void | |
199 | region_to_value_map::dump (bool simple) const | |
200 | { | |
201 | pretty_printer pp; | |
202 | pp_format_decoder (&pp) = default_tree_printer; | |
203 | pp_show_color (&pp) = pp_show_color (global_dc->printer); | |
204 | pp.buffer->stream = stderr; | |
205 | dump_to_pp (&pp, simple, true); | |
206 | pp_newline (&pp); | |
207 | pp_flush (&pp); | |
208 | } | |
209 | ||
210 | ||
211 | /* Attempt to merge THIS with OTHER, writing the result | |
212 | to OUT. | |
213 | ||
214 | For now, write (region, value) mappings that are in common between THIS | |
ce917b04 DM |
215 | and OTHER to OUT, effectively taking the intersection. |
216 | ||
217 | Reject merger of different values. */ | |
d726a57b DM |
218 | |
219 | bool | |
220 | region_to_value_map::can_merge_with_p (const region_to_value_map &other, | |
221 | region_to_value_map *out) const | |
222 | { | |
223 | for (auto iter : *this) | |
224 | { | |
225 | const region *iter_reg = iter.first; | |
226 | const svalue *iter_sval = iter.second; | |
227 | const svalue * const * other_slot = other.get (iter_reg); | |
228 | if (other_slot) | |
ce917b04 DM |
229 | { |
230 | if (iter_sval == *other_slot) | |
231 | out->put (iter_reg, iter_sval); | |
232 | else | |
233 | return false; | |
234 | } | |
d726a57b DM |
235 | } |
236 | return true; | |
237 | } | |
238 | ||
33255ad3 DM |
239 | /* Purge any state involving SVAL. */ |
240 | ||
241 | void | |
242 | region_to_value_map::purge_state_involving (const svalue *sval) | |
243 | { | |
244 | auto_vec<const region *> to_purge; | |
245 | for (auto iter : *this) | |
246 | { | |
247 | const region *iter_reg = iter.first; | |
248 | const svalue *iter_sval = iter.second; | |
249 | if (iter_reg->involves_p (sval) || iter_sval->involves_p (sval)) | |
250 | to_purge.safe_push (iter_reg); | |
251 | } | |
252 | for (auto iter : to_purge) | |
253 | m_hash_map.remove (iter); | |
254 | } | |
255 | ||
757bf1df DM |
256 | /* class region_model. */ |
257 | ||
808f4dfe | 258 | /* Ctor for region_model: construct an "empty" model. */ |
757bf1df | 259 | |
808f4dfe | 260 | region_model::region_model (region_model_manager *mgr) |
9a2c9579 DM |
261 | : m_mgr (mgr), m_store (), m_current_frame (NULL), |
262 | m_dynamic_extents () | |
757bf1df | 263 | { |
808f4dfe | 264 | m_constraints = new constraint_manager (mgr); |
757bf1df DM |
265 | } |
266 | ||
267 | /* region_model's copy ctor. */ | |
268 | ||
269 | region_model::region_model (const region_model &other) | |
808f4dfe DM |
270 | : m_mgr (other.m_mgr), m_store (other.m_store), |
271 | m_constraints (new constraint_manager (*other.m_constraints)), | |
9a2c9579 DM |
272 | m_current_frame (other.m_current_frame), |
273 | m_dynamic_extents (other.m_dynamic_extents) | |
757bf1df | 274 | { |
757bf1df DM |
275 | } |
276 | ||
277 | /* region_model's dtor. */ | |
278 | ||
279 | region_model::~region_model () | |
280 | { | |
281 | delete m_constraints; | |
282 | } | |
283 | ||
284 | /* region_model's assignment operator. */ | |
285 | ||
286 | region_model & | |
287 | region_model::operator= (const region_model &other) | |
288 | { | |
808f4dfe DM |
289 | /* m_mgr is const. */ |
290 | gcc_assert (m_mgr == other.m_mgr); | |
757bf1df | 291 | |
808f4dfe | 292 | m_store = other.m_store; |
757bf1df DM |
293 | |
294 | delete m_constraints; | |
808f4dfe | 295 | m_constraints = new constraint_manager (*other.m_constraints); |
757bf1df | 296 | |
808f4dfe | 297 | m_current_frame = other.m_current_frame; |
757bf1df | 298 | |
9a2c9579 DM |
299 | m_dynamic_extents = other.m_dynamic_extents; |
300 | ||
757bf1df DM |
301 | return *this; |
302 | } | |
303 | ||
304 | /* Equality operator for region_model. | |
305 | ||
808f4dfe DM |
306 | Amongst other things this directly compares the stores and the constraint |
307 | managers, so for this to be meaningful both this and OTHER should | |
757bf1df DM |
308 | have been canonicalized. */ |
309 | ||
310 | bool | |
311 | region_model::operator== (const region_model &other) const | |
312 | { | |
808f4dfe DM |
313 | /* We can only compare instances that use the same manager. */ |
314 | gcc_assert (m_mgr == other.m_mgr); | |
757bf1df | 315 | |
808f4dfe | 316 | if (m_store != other.m_store) |
757bf1df DM |
317 | return false; |
318 | ||
319 | if (*m_constraints != *other.m_constraints) | |
320 | return false; | |
321 | ||
808f4dfe DM |
322 | if (m_current_frame != other.m_current_frame) |
323 | return false; | |
757bf1df | 324 | |
9a2c9579 DM |
325 | if (m_dynamic_extents != other.m_dynamic_extents) |
326 | return false; | |
327 | ||
757bf1df DM |
328 | gcc_checking_assert (hash () == other.hash ()); |
329 | ||
330 | return true; | |
331 | } | |
332 | ||
333 | /* Generate a hash value for this region_model. */ | |
334 | ||
335 | hashval_t | |
808f4dfe DM |
336 | region_model::hash () const |
337 | { | |
338 | hashval_t result = m_store.hash (); | |
339 | result ^= m_constraints->hash (); | |
340 | return result; | |
757bf1df DM |
341 | } |
342 | ||
808f4dfe DM |
343 | /* Dump a representation of this model to PP, showing the |
344 | stack, the store, and any constraints. | |
345 | Use SIMPLE to control how svalues and regions are printed. */ | |
757bf1df DM |
346 | |
347 | void | |
808f4dfe DM |
348 | region_model::dump_to_pp (pretty_printer *pp, bool simple, |
349 | bool multiline) const | |
757bf1df | 350 | { |
808f4dfe DM |
351 | /* Dump stack. */ |
352 | pp_printf (pp, "stack depth: %i", get_stack_depth ()); | |
353 | if (multiline) | |
354 | pp_newline (pp); | |
355 | else | |
356 | pp_string (pp, " {"); | |
357 | for (const frame_region *iter_frame = m_current_frame; iter_frame; | |
358 | iter_frame = iter_frame->get_calling_frame ()) | |
359 | { | |
360 | if (multiline) | |
361 | pp_string (pp, " "); | |
362 | else if (iter_frame != m_current_frame) | |
363 | pp_string (pp, ", "); | |
364 | pp_printf (pp, "frame (index %i): ", iter_frame->get_index ()); | |
365 | iter_frame->dump_to_pp (pp, simple); | |
366 | if (multiline) | |
367 | pp_newline (pp); | |
368 | } | |
369 | if (!multiline) | |
370 | pp_string (pp, "}"); | |
371 | ||
372 | /* Dump store. */ | |
373 | if (!multiline) | |
374 | pp_string (pp, ", {"); | |
375 | m_store.dump_to_pp (pp, simple, multiline, | |
376 | m_mgr->get_store_manager ()); | |
377 | if (!multiline) | |
378 | pp_string (pp, "}"); | |
379 | ||
380 | /* Dump constraints. */ | |
381 | pp_string (pp, "constraint_manager:"); | |
382 | if (multiline) | |
383 | pp_newline (pp); | |
384 | else | |
385 | pp_string (pp, " {"); | |
386 | m_constraints->dump_to_pp (pp, multiline); | |
387 | if (!multiline) | |
388 | pp_string (pp, "}"); | |
9a2c9579 DM |
389 | |
390 | /* Dump sizes of dynamic regions, if any are known. */ | |
391 | if (!m_dynamic_extents.is_empty ()) | |
392 | { | |
393 | pp_string (pp, "dynamic_extents:"); | |
394 | m_dynamic_extents.dump_to_pp (pp, simple, multiline); | |
395 | } | |
808f4dfe | 396 | } |
757bf1df | 397 | |
808f4dfe | 398 | /* Dump a representation of this model to FILE. */ |
757bf1df | 399 | |
808f4dfe DM |
400 | void |
401 | region_model::dump (FILE *fp, bool simple, bool multiline) const | |
402 | { | |
403 | pretty_printer pp; | |
404 | pp_format_decoder (&pp) = default_tree_printer; | |
405 | pp_show_color (&pp) = pp_show_color (global_dc->printer); | |
406 | pp.buffer->stream = fp; | |
407 | dump_to_pp (&pp, simple, multiline); | |
408 | pp_newline (&pp); | |
409 | pp_flush (&pp); | |
757bf1df DM |
410 | } |
411 | ||
808f4dfe | 412 | /* Dump a multiline representation of this model to stderr. */ |
757bf1df | 413 | |
808f4dfe DM |
414 | DEBUG_FUNCTION void |
415 | region_model::dump (bool simple) const | |
416 | { | |
417 | dump (stderr, simple, true); | |
418 | } | |
757bf1df | 419 | |
808f4dfe | 420 | /* Dump a multiline representation of this model to stderr. */ |
757bf1df | 421 | |
808f4dfe DM |
422 | DEBUG_FUNCTION void |
423 | region_model::debug () const | |
757bf1df | 424 | { |
808f4dfe | 425 | dump (true); |
757bf1df DM |
426 | } |
427 | ||
e61ffa20 DM |
428 | /* Assert that this object is valid. */ |
429 | ||
430 | void | |
431 | region_model::validate () const | |
432 | { | |
433 | m_store.validate (); | |
434 | } | |
435 | ||
808f4dfe DM |
436 | /* Canonicalize the store and constraints, to maximize the chance of |
437 | equality between region_model instances. */ | |
757bf1df DM |
438 | |
439 | void | |
808f4dfe | 440 | region_model::canonicalize () |
757bf1df | 441 | { |
808f4dfe DM |
442 | m_store.canonicalize (m_mgr->get_store_manager ()); |
443 | m_constraints->canonicalize (); | |
757bf1df DM |
444 | } |
445 | ||
446 | /* Return true if this region_model is in canonical form. */ | |
447 | ||
448 | bool | |
449 | region_model::canonicalized_p () const | |
450 | { | |
451 | region_model copy (*this); | |
808f4dfe | 452 | copy.canonicalize (); |
757bf1df DM |
453 | return *this == copy; |
454 | } | |
455 | ||
808f4dfe DM |
456 | /* See the comment for store::loop_replay_fixup. */ |
457 | ||
458 | void | |
459 | region_model::loop_replay_fixup (const region_model *dst_state) | |
460 | { | |
461 | m_store.loop_replay_fixup (dst_state->get_store (), m_mgr); | |
462 | } | |
463 | ||
757bf1df DM |
464 | /* A subclass of pending_diagnostic for complaining about uses of |
465 | poisoned values. */ | |
466 | ||
467 | class poisoned_value_diagnostic | |
468 | : public pending_diagnostic_subclass<poisoned_value_diagnostic> | |
469 | { | |
470 | public: | |
00e7d024 | 471 | poisoned_value_diagnostic (tree expr, enum poison_kind pkind, |
b03a10b0 DM |
472 | const region *src_region, |
473 | tree check_expr) | |
00e7d024 | 474 | : m_expr (expr), m_pkind (pkind), |
b03a10b0 DM |
475 | m_src_region (src_region), |
476 | m_check_expr (check_expr) | |
757bf1df DM |
477 | {} |
478 | ||
ff171cb1 | 479 | const char *get_kind () const final override { return "poisoned_value_diagnostic"; } |
757bf1df | 480 | |
ff171cb1 | 481 | bool use_of_uninit_p () const final override |
33255ad3 DM |
482 | { |
483 | return m_pkind == POISON_KIND_UNINIT; | |
484 | } | |
485 | ||
757bf1df DM |
486 | bool operator== (const poisoned_value_diagnostic &other) const |
487 | { | |
00e7d024 DM |
488 | return (m_expr == other.m_expr |
489 | && m_pkind == other.m_pkind | |
490 | && m_src_region == other.m_src_region); | |
757bf1df DM |
491 | } |
492 | ||
ff171cb1 | 493 | int get_controlling_option () const final override |
7fd6e36e DM |
494 | { |
495 | switch (m_pkind) | |
496 | { | |
497 | default: | |
498 | gcc_unreachable (); | |
499 | case POISON_KIND_UNINIT: | |
500 | return OPT_Wanalyzer_use_of_uninitialized_value; | |
501 | case POISON_KIND_FREED: | |
502 | return OPT_Wanalyzer_use_after_free; | |
503 | case POISON_KIND_POPPED_STACK: | |
504 | return OPT_Wanalyzer_use_of_pointer_in_stale_stack_frame; | |
505 | } | |
506 | } | |
507 | ||
8f636915 DM |
508 | bool terminate_path_p () const final override { return true; } |
509 | ||
0e466e97 | 510 | bool emit (rich_location *rich_loc, logger *) final override |
757bf1df DM |
511 | { |
512 | switch (m_pkind) | |
513 | { | |
514 | default: | |
515 | gcc_unreachable (); | |
33255ad3 DM |
516 | case POISON_KIND_UNINIT: |
517 | { | |
518 | diagnostic_metadata m; | |
519 | m.add_cwe (457); /* "CWE-457: Use of Uninitialized Variable". */ | |
7fd6e36e | 520 | return warning_meta (rich_loc, m, get_controlling_option (), |
33255ad3 DM |
521 | "use of uninitialized value %qE", |
522 | m_expr); | |
523 | } | |
524 | break; | |
757bf1df DM |
525 | case POISON_KIND_FREED: |
526 | { | |
527 | diagnostic_metadata m; | |
528 | m.add_cwe (416); /* "CWE-416: Use After Free". */ | |
7fd6e36e | 529 | return warning_meta (rich_loc, m, get_controlling_option (), |
6c8e5844 DM |
530 | "use after %<free%> of %qE", |
531 | m_expr); | |
757bf1df DM |
532 | } |
533 | break; | |
534 | case POISON_KIND_POPPED_STACK: | |
535 | { | |
757bf1df | 536 | /* TODO: which CWE? */ |
808f4dfe | 537 | return warning_at |
7fd6e36e | 538 | (rich_loc, get_controlling_option (), |
808f4dfe DM |
539 | "dereferencing pointer %qE to within stale stack frame", |
540 | m_expr); | |
757bf1df DM |
541 | } |
542 | break; | |
543 | } | |
544 | } | |
545 | ||
ff171cb1 | 546 | label_text describe_final_event (const evdesc::final_event &ev) final override |
757bf1df DM |
547 | { |
548 | switch (m_pkind) | |
549 | { | |
550 | default: | |
551 | gcc_unreachable (); | |
33255ad3 DM |
552 | case POISON_KIND_UNINIT: |
553 | return ev.formatted_print ("use of uninitialized value %qE here", | |
554 | m_expr); | |
757bf1df DM |
555 | case POISON_KIND_FREED: |
556 | return ev.formatted_print ("use after %<free%> of %qE here", | |
557 | m_expr); | |
558 | case POISON_KIND_POPPED_STACK: | |
559 | return ev.formatted_print | |
808f4dfe | 560 | ("dereferencing pointer %qE to within stale stack frame", |
757bf1df DM |
561 | m_expr); |
562 | } | |
563 | } | |
564 | ||
ff171cb1 | 565 | void mark_interesting_stuff (interesting_t *interest) final override |
00e7d024 DM |
566 | { |
567 | if (m_src_region) | |
568 | interest->add_region_creation (m_src_region); | |
569 | } | |
570 | ||
b03a10b0 DM |
571 | /* Attempt to suppress false positives. |
572 | Reject paths where the value of the underlying region isn't poisoned. | |
573 | This can happen due to state merging when exploring the exploded graph, | |
574 | where the more precise analysis during feasibility analysis finds that | |
575 | the region is in fact valid. | |
576 | To do this we need to get the value from the fgraph. Unfortunately | |
577 | we can't simply query the state of m_src_region (from the enode), | |
578 | since it might be a different region in the fnode state (e.g. with | |
579 | heap-allocated regions, the numbering could be different). | |
580 | Hence we access m_check_expr, if available. */ | |
581 | ||
582 | bool check_valid_fpath_p (const feasible_node &fnode, | |
583 | const gimple *emission_stmt) | |
584 | const final override | |
585 | { | |
586 | if (!m_check_expr) | |
587 | return true; | |
588 | ||
589 | /* We've reached the enode, but not necessarily the right function_point. | |
590 | Try to get the state at the correct stmt. */ | |
591 | region_model emission_model (fnode.get_model ().get_manager()); | |
592 | if (!fnode.get_state_at_stmt (emission_stmt, &emission_model)) | |
593 | /* Couldn't get state; accept this diagnostic. */ | |
594 | return true; | |
595 | ||
596 | const svalue *fsval = emission_model.get_rvalue (m_check_expr, NULL); | |
597 | /* Check to see if the expr is also poisoned in FNODE (and in the | |
598 | same way). */ | |
599 | const poisoned_svalue * fspval = fsval->dyn_cast_poisoned_svalue (); | |
600 | if (!fspval) | |
601 | return false; | |
602 | if (fspval->get_poison_kind () != m_pkind) | |
603 | return false; | |
604 | return true; | |
605 | } | |
606 | ||
757bf1df DM |
607 | private: |
608 | tree m_expr; | |
609 | enum poison_kind m_pkind; | |
00e7d024 | 610 | const region *m_src_region; |
b03a10b0 | 611 | tree m_check_expr; |
757bf1df DM |
612 | }; |
613 | ||
5e00ad3f DM |
614 | /* A subclass of pending_diagnostic for complaining about shifts |
615 | by negative counts. */ | |
616 | ||
617 | class shift_count_negative_diagnostic | |
618 | : public pending_diagnostic_subclass<shift_count_negative_diagnostic> | |
619 | { | |
620 | public: | |
621 | shift_count_negative_diagnostic (const gassign *assign, tree count_cst) | |
622 | : m_assign (assign), m_count_cst (count_cst) | |
623 | {} | |
624 | ||
ff171cb1 | 625 | const char *get_kind () const final override |
5e00ad3f DM |
626 | { |
627 | return "shift_count_negative_diagnostic"; | |
628 | } | |
629 | ||
630 | bool operator== (const shift_count_negative_diagnostic &other) const | |
631 | { | |
632 | return (m_assign == other.m_assign | |
633 | && same_tree_p (m_count_cst, other.m_count_cst)); | |
634 | } | |
635 | ||
ff171cb1 | 636 | int get_controlling_option () const final override |
7fd6e36e DM |
637 | { |
638 | return OPT_Wanalyzer_shift_count_negative; | |
639 | } | |
640 | ||
0e466e97 | 641 | bool emit (rich_location *rich_loc, logger *) final override |
5e00ad3f | 642 | { |
7fd6e36e | 643 | return warning_at (rich_loc, get_controlling_option (), |
5e00ad3f DM |
644 | "shift by negative count (%qE)", m_count_cst); |
645 | } | |
646 | ||
ff171cb1 | 647 | label_text describe_final_event (const evdesc::final_event &ev) final override |
5e00ad3f DM |
648 | { |
649 | return ev.formatted_print ("shift by negative amount here (%qE)", m_count_cst); | |
650 | } | |
651 | ||
652 | private: | |
653 | const gassign *m_assign; | |
654 | tree m_count_cst; | |
655 | }; | |
656 | ||
657 | /* A subclass of pending_diagnostic for complaining about shifts | |
658 | by counts >= the width of the operand type. */ | |
659 | ||
660 | class shift_count_overflow_diagnostic | |
661 | : public pending_diagnostic_subclass<shift_count_overflow_diagnostic> | |
662 | { | |
663 | public: | |
664 | shift_count_overflow_diagnostic (const gassign *assign, | |
665 | int operand_precision, | |
666 | tree count_cst) | |
667 | : m_assign (assign), m_operand_precision (operand_precision), | |
668 | m_count_cst (count_cst) | |
669 | {} | |
670 | ||
ff171cb1 | 671 | const char *get_kind () const final override |
5e00ad3f DM |
672 | { |
673 | return "shift_count_overflow_diagnostic"; | |
674 | } | |
675 | ||
676 | bool operator== (const shift_count_overflow_diagnostic &other) const | |
677 | { | |
678 | return (m_assign == other.m_assign | |
679 | && m_operand_precision == other.m_operand_precision | |
680 | && same_tree_p (m_count_cst, other.m_count_cst)); | |
681 | } | |
682 | ||
ff171cb1 | 683 | int get_controlling_option () const final override |
7fd6e36e DM |
684 | { |
685 | return OPT_Wanalyzer_shift_count_overflow; | |
686 | } | |
687 | ||
0e466e97 | 688 | bool emit (rich_location *rich_loc, logger *) final override |
5e00ad3f | 689 | { |
7fd6e36e | 690 | return warning_at (rich_loc, get_controlling_option (), |
5e00ad3f DM |
691 | "shift by count (%qE) >= precision of type (%qi)", |
692 | m_count_cst, m_operand_precision); | |
693 | } | |
694 | ||
ff171cb1 | 695 | label_text describe_final_event (const evdesc::final_event &ev) final override |
5e00ad3f DM |
696 | { |
697 | return ev.formatted_print ("shift by count %qE here", m_count_cst); | |
698 | } | |
699 | ||
700 | private: | |
701 | const gassign *m_assign; | |
702 | int m_operand_precision; | |
703 | tree m_count_cst; | |
704 | }; | |
705 | ||
808f4dfe DM |
706 | /* If ASSIGN is a stmt that can be modelled via |
707 | set_value (lhs_reg, SVALUE, CTXT) | |
708 | for some SVALUE, get the SVALUE. | |
709 | Otherwise return NULL. */ | |
757bf1df | 710 | |
808f4dfe DM |
711 | const svalue * |
712 | region_model::get_gassign_result (const gassign *assign, | |
713 | region_model_context *ctxt) | |
757bf1df DM |
714 | { |
715 | tree lhs = gimple_assign_lhs (assign); | |
716 | tree rhs1 = gimple_assign_rhs1 (assign); | |
757bf1df DM |
717 | enum tree_code op = gimple_assign_rhs_code (assign); |
718 | switch (op) | |
719 | { | |
720 | default: | |
808f4dfe | 721 | return NULL; |
757bf1df DM |
722 | |
723 | case POINTER_PLUS_EXPR: | |
724 | { | |
725 | /* e.g. "_1 = a_10(D) + 12;" */ | |
726 | tree ptr = rhs1; | |
727 | tree offset = gimple_assign_rhs2 (assign); | |
728 | ||
808f4dfe DM |
729 | const svalue *ptr_sval = get_rvalue (ptr, ctxt); |
730 | const svalue *offset_sval = get_rvalue (offset, ctxt); | |
731 | /* Quoting tree.def, "the second operand [of a POINTER_PLUS_EXPR] | |
732 | is an integer of type sizetype". */ | |
733 | offset_sval = m_mgr->get_or_create_cast (size_type_node, offset_sval); | |
734 | ||
735 | const svalue *sval_binop | |
736 | = m_mgr->get_or_create_binop (TREE_TYPE (lhs), op, | |
737 | ptr_sval, offset_sval); | |
738 | return sval_binop; | |
757bf1df DM |
739 | } |
740 | break; | |
741 | ||
742 | case POINTER_DIFF_EXPR: | |
743 | { | |
744 | /* e.g. "_1 = p_2(D) - q_3(D);". */ | |
808f4dfe DM |
745 | tree rhs2 = gimple_assign_rhs2 (assign); |
746 | const svalue *rhs1_sval = get_rvalue (rhs1, ctxt); | |
747 | const svalue *rhs2_sval = get_rvalue (rhs2, ctxt); | |
757bf1df | 748 | |
808f4dfe | 749 | // TODO: perhaps fold to zero if they're known to be equal? |
757bf1df | 750 | |
808f4dfe DM |
751 | const svalue *sval_binop |
752 | = m_mgr->get_or_create_binop (TREE_TYPE (lhs), op, | |
753 | rhs1_sval, rhs2_sval); | |
754 | return sval_binop; | |
757bf1df DM |
755 | } |
756 | break; | |
757 | ||
808f4dfe DM |
758 | /* Assignments of the form |
759 | set_value (lvalue (LHS), rvalue (EXPR)) | |
760 | for various EXPR. | |
761 | We already have the lvalue for the LHS above, as "lhs_reg". */ | |
762 | case ADDR_EXPR: /* LHS = &RHS; */ | |
763 | case BIT_FIELD_REF: | |
764 | case COMPONENT_REF: /* LHS = op0.op1; */ | |
757bf1df | 765 | case MEM_REF: |
757bf1df | 766 | case REAL_CST: |
808f4dfe DM |
767 | case COMPLEX_CST: |
768 | case VECTOR_CST: | |
757bf1df DM |
769 | case INTEGER_CST: |
770 | case ARRAY_REF: | |
808f4dfe DM |
771 | case SSA_NAME: /* LHS = VAR; */ |
772 | case VAR_DECL: /* LHS = VAR; */ | |
773 | case PARM_DECL:/* LHS = VAR; */ | |
774 | case REALPART_EXPR: | |
775 | case IMAGPART_EXPR: | |
776 | return get_rvalue (rhs1, ctxt); | |
777 | ||
778 | case ABS_EXPR: | |
779 | case ABSU_EXPR: | |
780 | case CONJ_EXPR: | |
781 | case BIT_NOT_EXPR: | |
757bf1df DM |
782 | case FIX_TRUNC_EXPR: |
783 | case FLOAT_EXPR: | |
808f4dfe | 784 | case NEGATE_EXPR: |
757bf1df | 785 | case NOP_EXPR: |
808f4dfe | 786 | case VIEW_CONVERT_EXPR: |
757bf1df | 787 | { |
808f4dfe DM |
788 | /* Unary ops. */ |
789 | const svalue *rhs_sval = get_rvalue (rhs1, ctxt); | |
790 | const svalue *sval_unaryop | |
791 | = m_mgr->get_or_create_unaryop (TREE_TYPE (lhs), op, rhs_sval); | |
792 | return sval_unaryop; | |
757bf1df | 793 | } |
757bf1df DM |
794 | |
795 | case EQ_EXPR: | |
796 | case GE_EXPR: | |
797 | case LE_EXPR: | |
798 | case NE_EXPR: | |
799 | case GT_EXPR: | |
800 | case LT_EXPR: | |
808f4dfe DM |
801 | case UNORDERED_EXPR: |
802 | case ORDERED_EXPR: | |
757bf1df DM |
803 | { |
804 | tree rhs2 = gimple_assign_rhs2 (assign); | |
805 | ||
808f4dfe DM |
806 | const svalue *rhs1_sval = get_rvalue (rhs1, ctxt); |
807 | const svalue *rhs2_sval = get_rvalue (rhs2, ctxt); | |
757bf1df | 808 | |
2f5951bd | 809 | if (TREE_TYPE (lhs) == boolean_type_node) |
808f4dfe | 810 | { |
2f5951bd DM |
811 | /* Consider constraints between svalues. */ |
812 | tristate t = eval_condition (rhs1_sval, op, rhs2_sval); | |
813 | if (t.is_known ()) | |
814 | return m_mgr->get_or_create_constant_svalue | |
815 | (t.is_true () ? boolean_true_node : boolean_false_node); | |
808f4dfe | 816 | } |
2f5951bd DM |
817 | |
818 | /* Otherwise, generate a symbolic binary op. */ | |
819 | const svalue *sval_binop | |
820 | = m_mgr->get_or_create_binop (TREE_TYPE (lhs), op, | |
821 | rhs1_sval, rhs2_sval); | |
822 | return sval_binop; | |
757bf1df DM |
823 | } |
824 | break; | |
825 | ||
826 | case PLUS_EXPR: | |
827 | case MINUS_EXPR: | |
828 | case MULT_EXPR: | |
808f4dfe | 829 | case MULT_HIGHPART_EXPR: |
757bf1df | 830 | case TRUNC_DIV_EXPR: |
808f4dfe DM |
831 | case CEIL_DIV_EXPR: |
832 | case FLOOR_DIV_EXPR: | |
833 | case ROUND_DIV_EXPR: | |
757bf1df | 834 | case TRUNC_MOD_EXPR: |
808f4dfe DM |
835 | case CEIL_MOD_EXPR: |
836 | case FLOOR_MOD_EXPR: | |
837 | case ROUND_MOD_EXPR: | |
838 | case RDIV_EXPR: | |
839 | case EXACT_DIV_EXPR: | |
757bf1df DM |
840 | case LSHIFT_EXPR: |
841 | case RSHIFT_EXPR: | |
808f4dfe DM |
842 | case LROTATE_EXPR: |
843 | case RROTATE_EXPR: | |
757bf1df DM |
844 | case BIT_IOR_EXPR: |
845 | case BIT_XOR_EXPR: | |
846 | case BIT_AND_EXPR: | |
847 | case MIN_EXPR: | |
848 | case MAX_EXPR: | |
808f4dfe | 849 | case COMPLEX_EXPR: |
757bf1df DM |
850 | { |
851 | /* Binary ops. */ | |
852 | tree rhs2 = gimple_assign_rhs2 (assign); | |
853 | ||
808f4dfe DM |
854 | const svalue *rhs1_sval = get_rvalue (rhs1, ctxt); |
855 | const svalue *rhs2_sval = get_rvalue (rhs2, ctxt); | |
757bf1df | 856 | |
5e00ad3f DM |
857 | if (ctxt && (op == LSHIFT_EXPR || op == RSHIFT_EXPR)) |
858 | { | |
859 | /* "INT34-C. Do not shift an expression by a negative number of bits | |
860 | or by greater than or equal to the number of bits that exist in | |
861 | the operand." */ | |
862 | if (const tree rhs2_cst = rhs2_sval->maybe_get_constant ()) | |
a4913a19 DM |
863 | if (TREE_CODE (rhs2_cst) == INTEGER_CST |
864 | && INTEGRAL_TYPE_P (TREE_TYPE (rhs1))) | |
5e00ad3f DM |
865 | { |
866 | if (tree_int_cst_sgn (rhs2_cst) < 0) | |
6341f14e DM |
867 | ctxt->warn |
868 | (make_unique<shift_count_negative_diagnostic> | |
869 | (assign, rhs2_cst)); | |
5e00ad3f DM |
870 | else if (compare_tree_int (rhs2_cst, |
871 | TYPE_PRECISION (TREE_TYPE (rhs1))) | |
872 | >= 0) | |
6341f14e DM |
873 | ctxt->warn |
874 | (make_unique<shift_count_overflow_diagnostic> | |
875 | (assign, | |
876 | int (TYPE_PRECISION (TREE_TYPE (rhs1))), | |
877 | rhs2_cst)); | |
5e00ad3f DM |
878 | } |
879 | } | |
880 | ||
808f4dfe DM |
881 | const svalue *sval_binop |
882 | = m_mgr->get_or_create_binop (TREE_TYPE (lhs), op, | |
883 | rhs1_sval, rhs2_sval); | |
884 | return sval_binop; | |
885 | } | |
886 | ||
887 | /* Vector expressions. In theory we could implement these elementwise, | |
888 | but for now, simply return unknown values. */ | |
889 | case VEC_DUPLICATE_EXPR: | |
890 | case VEC_SERIES_EXPR: | |
891 | case VEC_COND_EXPR: | |
892 | case VEC_PERM_EXPR: | |
1b0be822 DM |
893 | case VEC_WIDEN_MULT_HI_EXPR: |
894 | case VEC_WIDEN_MULT_LO_EXPR: | |
895 | case VEC_WIDEN_MULT_EVEN_EXPR: | |
896 | case VEC_WIDEN_MULT_ODD_EXPR: | |
897 | case VEC_UNPACK_HI_EXPR: | |
898 | case VEC_UNPACK_LO_EXPR: | |
899 | case VEC_UNPACK_FLOAT_HI_EXPR: | |
900 | case VEC_UNPACK_FLOAT_LO_EXPR: | |
901 | case VEC_UNPACK_FIX_TRUNC_HI_EXPR: | |
902 | case VEC_UNPACK_FIX_TRUNC_LO_EXPR: | |
903 | case VEC_PACK_TRUNC_EXPR: | |
904 | case VEC_PACK_SAT_EXPR: | |
905 | case VEC_PACK_FIX_TRUNC_EXPR: | |
906 | case VEC_PACK_FLOAT_EXPR: | |
907 | case VEC_WIDEN_LSHIFT_HI_EXPR: | |
908 | case VEC_WIDEN_LSHIFT_LO_EXPR: | |
808f4dfe DM |
909 | return m_mgr->get_or_create_unknown_svalue (TREE_TYPE (lhs)); |
910 | } | |
911 | } | |
912 | ||
1e2fe671 DM |
913 | /* Workaround for discarding certain false positives from |
914 | -Wanalyzer-use-of-uninitialized-value | |
915 | of the form: | |
916 | ((A OR-IF B) OR-IF C) | |
917 | and: | |
918 | ((A AND-IF B) AND-IF C) | |
919 | where evaluating B is redundant, but could involve simple accesses of | |
920 | uninitialized locals. | |
921 | ||
922 | When optimization is turned on the FE can immediately fold compound | |
923 | conditionals. Specifically, c_parser_condition parses this condition: | |
924 | ((A OR-IF B) OR-IF C) | |
925 | and calls c_fully_fold on the condition. | |
926 | Within c_fully_fold, fold_truth_andor is called, which bails when | |
927 | optimization is off, but if any optimization is turned on can convert the | |
928 | ((A OR-IF B) OR-IF C) | |
929 | into: | |
930 | ((A OR B) OR_IF C) | |
931 | for sufficiently simple B | |
932 | i.e. the inner OR-IF becomes an OR. | |
933 | At gimplification time the inner OR becomes BIT_IOR_EXPR (in gimplify_expr), | |
934 | giving this for the inner condition: | |
935 | tmp = A | B; | |
936 | if (tmp) | |
937 | thus effectively synthesizing a redundant access of B when optimization | |
938 | is turned on, when compared to: | |
939 | if (A) goto L1; else goto L4; | |
940 | L1: if (B) goto L2; else goto L4; | |
941 | L2: if (C) goto L3; else goto L4; | |
942 | for the unoptimized case. | |
943 | ||
944 | Return true if CTXT appears to be handling such a short-circuitable stmt, | |
945 | such as the def-stmt for B for the: | |
946 | tmp = A | B; | |
947 | case above, for the case where A is true and thus B would have been | |
948 | short-circuited without optimization, using MODEL for the value of A. */ | |
949 | ||
950 | static bool | |
951 | within_short_circuited_stmt_p (const region_model *model, | |
b33dd787 | 952 | const gassign *assign_stmt) |
1e2fe671 | 953 | { |
1e2fe671 | 954 | /* We must have an assignment to a temporary of _Bool type. */ |
1e2fe671 DM |
955 | tree lhs = gimple_assign_lhs (assign_stmt); |
956 | if (TREE_TYPE (lhs) != boolean_type_node) | |
957 | return false; | |
958 | if (TREE_CODE (lhs) != SSA_NAME) | |
959 | return false; | |
960 | if (SSA_NAME_VAR (lhs) != NULL_TREE) | |
961 | return false; | |
962 | ||
963 | /* The temporary bool must be used exactly once: as the second arg of | |
964 | a BIT_IOR_EXPR or BIT_AND_EXPR. */ | |
965 | use_operand_p use_op; | |
966 | gimple *use_stmt; | |
967 | if (!single_imm_use (lhs, &use_op, &use_stmt)) | |
968 | return false; | |
969 | const gassign *use_assign = dyn_cast <const gassign *> (use_stmt); | |
970 | if (!use_assign) | |
971 | return false; | |
972 | enum tree_code op = gimple_assign_rhs_code (use_assign); | |
973 | if (!(op == BIT_IOR_EXPR ||op == BIT_AND_EXPR)) | |
974 | return false; | |
975 | if (!(gimple_assign_rhs1 (use_assign) != lhs | |
976 | && gimple_assign_rhs2 (use_assign) == lhs)) | |
977 | return false; | |
978 | ||
979 | /* The first arg of the bitwise stmt must have a known value in MODEL | |
980 | that implies that the value of the second arg doesn't matter, i.e. | |
981 | 1 for bitwise or, 0 for bitwise and. */ | |
982 | tree other_arg = gimple_assign_rhs1 (use_assign); | |
983 | /* Use a NULL ctxt here to avoid generating warnings. */ | |
984 | const svalue *other_arg_sval = model->get_rvalue (other_arg, NULL); | |
985 | tree other_arg_cst = other_arg_sval->maybe_get_constant (); | |
986 | if (!other_arg_cst) | |
987 | return false; | |
988 | switch (op) | |
989 | { | |
990 | default: | |
991 | gcc_unreachable (); | |
992 | case BIT_IOR_EXPR: | |
993 | if (zerop (other_arg_cst)) | |
994 | return false; | |
995 | break; | |
996 | case BIT_AND_EXPR: | |
997 | if (!zerop (other_arg_cst)) | |
998 | return false; | |
999 | break; | |
1000 | } | |
1001 | ||
1002 | /* All tests passed. We appear to be in a stmt that generates a boolean | |
1003 | temporary with a value that won't matter. */ | |
1004 | return true; | |
1005 | } | |
1006 | ||
b33dd787 DM |
1007 | /* Workaround for discarding certain false positives from |
1008 | -Wanalyzer-use-of-uninitialized-value | |
1009 | seen with -ftrivial-auto-var-init=. | |
1010 | ||
1011 | -ftrivial-auto-var-init= will generate calls to IFN_DEFERRED_INIT. | |
1012 | ||
1013 | If the address of the var is taken, gimplification will give us | |
1014 | something like: | |
1015 | ||
1016 | _1 = .DEFERRED_INIT (4, 2, &"len"[0]); | |
1017 | len = _1; | |
1018 | ||
1019 | The result of DEFERRED_INIT will be an uninit value; we don't | |
1020 | want to emit a false positive for "len = _1;" | |
1021 | ||
1022 | Return true if ASSIGN_STMT is such a stmt. */ | |
1023 | ||
1024 | static bool | |
1025 | due_to_ifn_deferred_init_p (const gassign *assign_stmt) | |
1026 | ||
1027 | { | |
1028 | /* We must have an assignment to a decl from an SSA name that's the | |
1029 | result of a IFN_DEFERRED_INIT call. */ | |
1030 | if (gimple_assign_rhs_code (assign_stmt) != SSA_NAME) | |
1031 | return false; | |
1032 | tree lhs = gimple_assign_lhs (assign_stmt); | |
1033 | if (TREE_CODE (lhs) != VAR_DECL) | |
1034 | return false; | |
1035 | tree rhs = gimple_assign_rhs1 (assign_stmt); | |
1036 | if (TREE_CODE (rhs) != SSA_NAME) | |
1037 | return false; | |
1038 | const gimple *def_stmt = SSA_NAME_DEF_STMT (rhs); | |
1039 | const gcall *call = dyn_cast <const gcall *> (def_stmt); | |
1040 | if (!call) | |
1041 | return false; | |
1042 | if (gimple_call_internal_p (call) | |
1043 | && gimple_call_internal_fn (call) == IFN_DEFERRED_INIT) | |
1044 | return true; | |
1045 | return false; | |
1046 | } | |
1047 | ||
33255ad3 DM |
1048 | /* Check for SVAL being poisoned, adding a warning to CTXT. |
1049 | Return SVAL, or, if a warning is added, another value, to avoid | |
2fdc8546 DM |
1050 | repeatedly complaining about the same poisoned value in followup code. |
1051 | SRC_REGION is a hint about where SVAL came from, and can be NULL. */ | |
33255ad3 DM |
1052 | |
1053 | const svalue * | |
1054 | region_model::check_for_poison (const svalue *sval, | |
1055 | tree expr, | |
2fdc8546 | 1056 | const region *src_region, |
33255ad3 DM |
1057 | region_model_context *ctxt) const |
1058 | { | |
1059 | if (!ctxt) | |
1060 | return sval; | |
1061 | ||
1062 | if (const poisoned_svalue *poisoned_sval = sval->dyn_cast_poisoned_svalue ()) | |
1063 | { | |
cc68ad87 DM |
1064 | enum poison_kind pkind = poisoned_sval->get_poison_kind (); |
1065 | ||
1066 | /* Ignore uninitialized uses of empty types; there's nothing | |
1067 | to initialize. */ | |
1068 | if (pkind == POISON_KIND_UNINIT | |
1069 | && sval->get_type () | |
1070 | && is_empty_type (sval->get_type ())) | |
1071 | return sval; | |
1072 | ||
b33dd787 DM |
1073 | if (pkind == POISON_KIND_UNINIT) |
1074 | if (const gimple *curr_stmt = ctxt->get_stmt ()) | |
1075 | if (const gassign *assign_stmt | |
1076 | = dyn_cast <const gassign *> (curr_stmt)) | |
1077 | { | |
1078 | /* Special case to avoid certain false positives. */ | |
1079 | if (within_short_circuited_stmt_p (this, assign_stmt)) | |
1080 | return sval; | |
1081 | ||
1082 | /* Special case to avoid false positive on | |
1083 | -ftrivial-auto-var-init=. */ | |
1084 | if (due_to_ifn_deferred_init_p (assign_stmt)) | |
1085 | return sval; | |
1086 | } | |
1e2fe671 | 1087 | |
33255ad3 DM |
1088 | /* If we have an SSA name for a temporary, we don't want to print |
1089 | '<unknown>'. | |
1090 | Poisoned values are shared by type, and so we can't reconstruct | |
1091 | the tree other than via the def stmts, using | |
1092 | fixup_tree_for_diagnostic. */ | |
1093 | tree diag_arg = fixup_tree_for_diagnostic (expr); | |
2fdc8546 | 1094 | if (src_region == NULL && pkind == POISON_KIND_UNINIT) |
00e7d024 | 1095 | src_region = get_region_for_poisoned_expr (expr); |
b03a10b0 DM |
1096 | |
1097 | /* Can we reliably get the poisoned value from "expr"? | |
1098 | This is for use by poisoned_value_diagnostic::check_valid_fpath_p. | |
1099 | Unfortunately, we might not have a reliable value for EXPR. | |
1100 | Hence we only query its value now, and only use it if we get the | |
1101 | poisoned value back again. */ | |
1102 | tree check_expr = expr; | |
1103 | const svalue *foo_sval = get_rvalue (expr, NULL); | |
1104 | if (foo_sval == sval) | |
1105 | check_expr = expr; | |
1106 | else | |
1107 | check_expr = NULL; | |
6341f14e DM |
1108 | if (ctxt->warn (make_unique<poisoned_value_diagnostic> (diag_arg, |
1109 | pkind, | |
b03a10b0 DM |
1110 | src_region, |
1111 | check_expr))) | |
33255ad3 DM |
1112 | { |
1113 | /* We only want to report use of a poisoned value at the first | |
1114 | place it gets used; return an unknown value to avoid generating | |
1115 | a chain of followup warnings. */ | |
1116 | sval = m_mgr->get_or_create_unknown_svalue (sval->get_type ()); | |
1117 | } | |
1118 | ||
1119 | return sval; | |
1120 | } | |
1121 | ||
1122 | return sval; | |
1123 | } | |
1124 | ||
00e7d024 DM |
1125 | /* Attempt to get a region for describing EXPR, the source of region of |
1126 | a poisoned_svalue for use in a poisoned_value_diagnostic. | |
1127 | Return NULL if there is no good region to use. */ | |
1128 | ||
1129 | const region * | |
1130 | region_model::get_region_for_poisoned_expr (tree expr) const | |
1131 | { | |
1132 | if (TREE_CODE (expr) == SSA_NAME) | |
1133 | { | |
1134 | tree decl = SSA_NAME_VAR (expr); | |
1135 | if (decl && DECL_P (decl)) | |
1136 | expr = decl; | |
1137 | else | |
1138 | return NULL; | |
1139 | } | |
1140 | return get_lvalue (expr, NULL); | |
1141 | } | |
1142 | ||
808f4dfe DM |
1143 | /* Update this model for the ASSIGN stmt, using CTXT to report any |
1144 | diagnostics. */ | |
1145 | ||
1146 | void | |
1147 | region_model::on_assignment (const gassign *assign, region_model_context *ctxt) | |
1148 | { | |
1149 | tree lhs = gimple_assign_lhs (assign); | |
1150 | tree rhs1 = gimple_assign_rhs1 (assign); | |
1151 | ||
1152 | const region *lhs_reg = get_lvalue (lhs, ctxt); | |
1153 | ||
1154 | /* Most assignments are handled by: | |
1155 | set_value (lhs_reg, SVALUE, CTXT) | |
1156 | for some SVALUE. */ | |
1157 | if (const svalue *sval = get_gassign_result (assign, ctxt)) | |
1158 | { | |
33255ad3 | 1159 | tree expr = get_diagnostic_tree_for_gassign (assign); |
2fdc8546 | 1160 | check_for_poison (sval, expr, NULL, ctxt); |
808f4dfe DM |
1161 | set_value (lhs_reg, sval, ctxt); |
1162 | return; | |
1163 | } | |
1164 | ||
1165 | enum tree_code op = gimple_assign_rhs_code (assign); | |
1166 | switch (op) | |
1167 | { | |
1168 | default: | |
1169 | { | |
1b0be822 | 1170 | if (0) |
808f4dfe DM |
1171 | sorry_at (assign->location, "unhandled assignment op: %qs", |
1172 | get_tree_code_name (op)); | |
1b0be822 DM |
1173 | const svalue *unknown_sval |
1174 | = m_mgr->get_or_create_unknown_svalue (TREE_TYPE (lhs)); | |
1175 | set_value (lhs_reg, unknown_sval, ctxt); | |
757bf1df DM |
1176 | } |
1177 | break; | |
1178 | ||
808f4dfe DM |
1179 | case CONSTRUCTOR: |
1180 | { | |
1181 | if (TREE_CLOBBER_P (rhs1)) | |
1182 | { | |
1183 | /* e.g. "x ={v} {CLOBBER};" */ | |
1184 | clobber_region (lhs_reg); | |
1185 | } | |
1186 | else | |
1187 | { | |
1188 | /* Any CONSTRUCTOR that survives to this point is either | |
1189 | just a zero-init of everything, or a vector. */ | |
1190 | if (!CONSTRUCTOR_NO_CLEARING (rhs1)) | |
1191 | zero_fill_region (lhs_reg); | |
1192 | unsigned ix; | |
1193 | tree index; | |
1194 | tree val; | |
1195 | FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (rhs1), ix, index, val) | |
1196 | { | |
1197 | gcc_assert (TREE_CODE (TREE_TYPE (rhs1)) == VECTOR_TYPE); | |
1198 | if (!index) | |
1199 | index = build_int_cst (integer_type_node, ix); | |
1200 | gcc_assert (TREE_CODE (index) == INTEGER_CST); | |
1201 | const svalue *index_sval | |
1202 | = m_mgr->get_or_create_constant_svalue (index); | |
1203 | gcc_assert (index_sval); | |
1204 | const region *sub_reg | |
1205 | = m_mgr->get_element_region (lhs_reg, | |
1206 | TREE_TYPE (val), | |
1207 | index_sval); | |
1208 | const svalue *val_sval = get_rvalue (val, ctxt); | |
1209 | set_value (sub_reg, val_sval, ctxt); | |
1210 | } | |
1211 | } | |
1212 | } | |
1213 | break; | |
1214 | ||
1215 | case STRING_CST: | |
757bf1df | 1216 | { |
808f4dfe | 1217 | /* e.g. "struct s2 x = {{'A', 'B', 'C', 'D'}};". */ |
808f4dfe DM |
1218 | const svalue *rhs_sval = get_rvalue (rhs1, ctxt); |
1219 | m_store.set_value (m_mgr->get_store_manager(), lhs_reg, rhs_sval, | |
e61ffa20 | 1220 | ctxt ? ctxt->get_uncertainty () : NULL); |
757bf1df DM |
1221 | } |
1222 | break; | |
1223 | } | |
1224 | } | |
1225 | ||
33255ad3 | 1226 | /* Handle the pre-sm-state part of STMT, modifying this object in-place. |
33255ad3 DM |
1227 | Write true to *OUT_UNKNOWN_SIDE_EFFECTS if the stmt has unknown |
1228 | side effects. */ | |
1229 | ||
1230 | void | |
1231 | region_model::on_stmt_pre (const gimple *stmt, | |
33255ad3 DM |
1232 | bool *out_unknown_side_effects, |
1233 | region_model_context *ctxt) | |
1234 | { | |
1235 | switch (gimple_code (stmt)) | |
1236 | { | |
1237 | default: | |
1238 | /* No-op for now. */ | |
1239 | break; | |
1240 | ||
1241 | case GIMPLE_ASSIGN: | |
1242 | { | |
1243 | const gassign *assign = as_a <const gassign *> (stmt); | |
1244 | on_assignment (assign, ctxt); | |
1245 | } | |
1246 | break; | |
1247 | ||
1248 | case GIMPLE_ASM: | |
ded2c2c0 DM |
1249 | { |
1250 | const gasm *asm_stmt = as_a <const gasm *> (stmt); | |
1251 | on_asm_stmt (asm_stmt, ctxt); | |
1252 | } | |
33255ad3 DM |
1253 | break; |
1254 | ||
1255 | case GIMPLE_CALL: | |
1256 | { | |
1257 | /* Track whether we have a gcall to a function that's not recognized by | |
1258 | anything, for which we don't have a function body, or for which we | |
1259 | don't know the fndecl. */ | |
1260 | const gcall *call = as_a <const gcall *> (stmt); | |
6bd31b33 | 1261 | *out_unknown_side_effects = on_call_pre (call, ctxt); |
33255ad3 DM |
1262 | } |
1263 | break; | |
1264 | ||
1265 | case GIMPLE_RETURN: | |
1266 | { | |
1267 | const greturn *return_ = as_a <const greturn *> (stmt); | |
1268 | on_return (return_, ctxt); | |
1269 | } | |
1270 | break; | |
1271 | } | |
1272 | } | |
1273 | ||
3b691e01 DM |
1274 | /* Given a call CD with function attribute FORMAT_ATTR, check that the |
1275 | format arg to the call is a valid null-terminated string. */ | |
1276 | ||
1277 | void | |
1278 | region_model::check_call_format_attr (const call_details &cd, | |
1279 | tree format_attr) const | |
1280 | { | |
1281 | /* We assume that FORMAT_ATTR has already been validated. */ | |
1282 | ||
1283 | /* arg0 of the attribute should be kind of format strings | |
1284 | that this function expects (e.g. "printf"). */ | |
1285 | const tree arg0_tree_list = TREE_VALUE (format_attr); | |
1286 | if (!arg0_tree_list) | |
1287 | return; | |
1288 | ||
1289 | /* arg1 of the attribute should be the 1-based parameter index | |
1290 | to treat as the format string. */ | |
1291 | const tree arg1_tree_list = TREE_CHAIN (arg0_tree_list); | |
1292 | if (!arg1_tree_list) | |
1293 | return; | |
1294 | const tree arg1_value = TREE_VALUE (arg1_tree_list); | |
1295 | if (!arg1_value) | |
1296 | return; | |
1297 | ||
1298 | unsigned format_arg_idx = TREE_INT_CST_LOW (arg1_value) - 1; | |
1299 | if (cd.num_args () <= format_arg_idx) | |
1300 | return; | |
1301 | ||
1302 | /* Subclass of annotating_context that | |
1303 | adds a note about the format attr to any saved diagnostics. */ | |
1304 | class annotating_ctxt : public annotating_context | |
1305 | { | |
1306 | public: | |
1307 | annotating_ctxt (const call_details &cd, | |
1308 | unsigned fmt_param_idx) | |
1309 | : annotating_context (cd.get_ctxt ()), | |
1310 | m_cd (cd), | |
1311 | m_fmt_param_idx (fmt_param_idx) | |
1312 | { | |
1313 | } | |
1314 | void add_annotations () final override | |
1315 | { | |
1316 | class reason_format_attr | |
1317 | : public pending_note_subclass<reason_format_attr> | |
1318 | { | |
1319 | public: | |
1320 | reason_format_attr (const call_arg_details &arg_details) | |
1321 | : m_arg_details (arg_details) | |
1322 | { | |
1323 | } | |
1324 | ||
1325 | const char *get_kind () const final override | |
1326 | { | |
1327 | return "reason_format_attr"; | |
1328 | } | |
1329 | ||
1330 | void emit () const final override | |
1331 | { | |
1332 | inform (DECL_SOURCE_LOCATION (m_arg_details.m_called_fndecl), | |
1333 | "parameter %i of %qD marked as a format string" | |
1334 | " via %qs attribute", | |
1335 | m_arg_details.m_arg_idx + 1, m_arg_details.m_called_fndecl, | |
1336 | "format"); | |
1337 | } | |
1338 | ||
1339 | bool operator== (const reason_format_attr &other) const | |
1340 | { | |
1341 | return m_arg_details == other.m_arg_details; | |
1342 | } | |
1343 | ||
1344 | private: | |
1345 | call_arg_details m_arg_details; | |
1346 | }; | |
1347 | ||
1348 | call_arg_details arg_details (m_cd, m_fmt_param_idx); | |
1349 | add_note (make_unique<reason_format_attr> (arg_details)); | |
1350 | } | |
1351 | private: | |
1352 | const call_details &m_cd; | |
1353 | unsigned m_fmt_param_idx; | |
1354 | }; | |
1355 | ||
1356 | annotating_ctxt my_ctxt (cd, format_arg_idx); | |
1357 | call_details my_cd (cd, &my_ctxt); | |
1358 | my_cd.check_for_null_terminated_string_arg (format_arg_idx); | |
1359 | } | |
1360 | ||
9ff3e236 | 1361 | /* Ensure that all arguments at the call described by CD are checked |
3b691e01 DM |
1362 | for poisoned values, by calling get_rvalue on each argument. |
1363 | ||
1364 | Check that calls to functions with "format" attribute have valid | |
1365 | null-terminated strings for their format argument. */ | |
9ff3e236 DM |
1366 | |
1367 | void | |
1368 | region_model::check_call_args (const call_details &cd) const | |
1369 | { | |
1370 | for (unsigned arg_idx = 0; arg_idx < cd.num_args (); arg_idx++) | |
1371 | cd.get_arg_svalue (arg_idx); | |
3b691e01 DM |
1372 | |
1373 | /* Handle attribute "format". */ | |
1374 | if (tree format_attr = cd.lookup_function_attribute ("format")) | |
1375 | check_call_format_attr (cd, format_attr); | |
9ff3e236 DM |
1376 | } |
1377 | ||
792f039f DM |
1378 | /* Update this model for an outcome of a call that returns a specific |
1379 | integer constant. | |
07e30160 DM |
1380 | If UNMERGEABLE, then make the result unmergeable, e.g. to prevent |
1381 | the state-merger code from merging success and failure outcomes. */ | |
1382 | ||
1383 | void | |
792f039f DM |
1384 | region_model::update_for_int_cst_return (const call_details &cd, |
1385 | int retval, | |
1386 | bool unmergeable) | |
07e30160 DM |
1387 | { |
1388 | if (!cd.get_lhs_type ()) | |
1389 | return; | |
4e4e45a4 DM |
1390 | if (TREE_CODE (cd.get_lhs_type ()) != INTEGER_TYPE) |
1391 | return; | |
07e30160 | 1392 | const svalue *result |
792f039f | 1393 | = m_mgr->get_or_create_int_cst (cd.get_lhs_type (), retval); |
07e30160 DM |
1394 | if (unmergeable) |
1395 | result = m_mgr->get_or_create_unmergeable (result); | |
1396 | set_value (cd.get_lhs_region (), result, cd.get_ctxt ()); | |
1397 | } | |
1398 | ||
792f039f DM |
1399 | /* Update this model for an outcome of a call that returns zero. |
1400 | If UNMERGEABLE, then make the result unmergeable, e.g. to prevent | |
1401 | the state-merger code from merging success and failure outcomes. */ | |
1402 | ||
1403 | void | |
1404 | region_model::update_for_zero_return (const call_details &cd, | |
1405 | bool unmergeable) | |
1406 | { | |
1407 | update_for_int_cst_return (cd, 0, unmergeable); | |
1408 | } | |
1409 | ||
73da34a5 DM |
1410 | /* Update this model for an outcome of a call that returns non-zero. |
1411 | Specifically, assign an svalue to the LHS, and add a constraint that | |
1412 | that svalue is non-zero. */ | |
07e30160 DM |
1413 | |
1414 | void | |
1415 | region_model::update_for_nonzero_return (const call_details &cd) | |
1416 | { | |
1417 | if (!cd.get_lhs_type ()) | |
1418 | return; | |
4e4e45a4 DM |
1419 | if (TREE_CODE (cd.get_lhs_type ()) != INTEGER_TYPE) |
1420 | return; | |
73da34a5 | 1421 | cd.set_any_lhs_with_defaults (); |
07e30160 DM |
1422 | const svalue *zero |
1423 | = m_mgr->get_or_create_int_cst (cd.get_lhs_type (), 0); | |
1424 | const svalue *result | |
1425 | = get_store_value (cd.get_lhs_region (), cd.get_ctxt ()); | |
1426 | add_constraint (result, NE_EXPR, zero, cd.get_ctxt ()); | |
1427 | } | |
1428 | ||
1429 | /* Subroutine of region_model::maybe_get_copy_bounds. | |
1430 | The Linux kernel commonly uses | |
1431 | min_t([unsigned] long, VAR, sizeof(T)); | |
1432 | to set an upper bound on the size of a copy_to_user. | |
1433 | Attempt to simplify such sizes by trying to get the upper bound as a | |
1434 | constant. | |
1435 | Return the simplified svalue if possible, or NULL otherwise. */ | |
1436 | ||
1437 | static const svalue * | |
1438 | maybe_simplify_upper_bound (const svalue *num_bytes_sval, | |
1439 | region_model_manager *mgr) | |
1440 | { | |
1441 | tree type = num_bytes_sval->get_type (); | |
1442 | while (const svalue *raw = num_bytes_sval->maybe_undo_cast ()) | |
1443 | num_bytes_sval = raw; | |
1444 | if (const binop_svalue *binop_sval = num_bytes_sval->dyn_cast_binop_svalue ()) | |
1445 | if (binop_sval->get_op () == MIN_EXPR) | |
1446 | if (binop_sval->get_arg1 ()->get_kind () == SK_CONSTANT) | |
1447 | { | |
1448 | return mgr->get_or_create_cast (type, binop_sval->get_arg1 ()); | |
1449 | /* TODO: we might want to also capture the constraint | |
1450 | when recording the diagnostic, or note that we're using | |
1451 | the upper bound. */ | |
1452 | } | |
1453 | return NULL; | |
1454 | } | |
1455 | ||
1456 | /* Attempt to get an upper bound for the size of a copy when simulating a | |
1457 | copy function. | |
1458 | ||
1459 | NUM_BYTES_SVAL is the symbolic value for the size of the copy. | |
1460 | Use it if it's constant, otherwise try to simplify it. Failing | |
1461 | that, use the size of SRC_REG if constant. | |
1462 | ||
1463 | Return a symbolic value for an upper limit on the number of bytes | |
1464 | copied, or NULL if no such value could be determined. */ | |
1465 | ||
1466 | const svalue * | |
1467 | region_model::maybe_get_copy_bounds (const region *src_reg, | |
1468 | const svalue *num_bytes_sval) | |
1469 | { | |
1470 | if (num_bytes_sval->maybe_get_constant ()) | |
1471 | return num_bytes_sval; | |
1472 | ||
1473 | if (const svalue *simplified | |
1474 | = maybe_simplify_upper_bound (num_bytes_sval, m_mgr)) | |
1475 | num_bytes_sval = simplified; | |
1476 | ||
1477 | if (num_bytes_sval->maybe_get_constant ()) | |
1478 | return num_bytes_sval; | |
1479 | ||
1480 | /* For now, try just guessing the size as the capacity of the | |
1481 | base region of the src. | |
1482 | This is a hack; we might get too large a value. */ | |
1483 | const region *src_base_reg = src_reg->get_base_region (); | |
1484 | num_bytes_sval = get_capacity (src_base_reg); | |
1485 | ||
1486 | if (num_bytes_sval->maybe_get_constant ()) | |
1487 | return num_bytes_sval; | |
1488 | ||
1489 | /* Non-constant: give up. */ | |
1490 | return NULL; | |
1491 | } | |
1492 | ||
6bd31b33 DM |
1493 | /* Get any known_function for FNDECL for call CD. |
1494 | ||
1495 | The call must match all assumptions made by the known_function (such as | |
1496 | e.g. "argument 1's type must be a pointer type"). | |
1497 | ||
1498 | Return NULL if no known_function is found, or it does not match the | |
1499 | assumption(s). */ | |
1500 | ||
1501 | const known_function * | |
1502 | region_model::get_known_function (tree fndecl, const call_details &cd) const | |
1503 | { | |
1504 | known_function_manager *known_fn_mgr = m_mgr->get_known_function_manager (); | |
1505 | return known_fn_mgr->get_match (fndecl, cd); | |
1506 | } | |
1507 | ||
1508 | /* Get any known_function for IFN, or NULL. */ | |
07e30160 DM |
1509 | |
1510 | const known_function * | |
6bd31b33 | 1511 | region_model::get_known_function (enum internal_fn ifn) const |
07e30160 DM |
1512 | { |
1513 | known_function_manager *known_fn_mgr = m_mgr->get_known_function_manager (); | |
6bd31b33 | 1514 | return known_fn_mgr->get_internal_fn (ifn); |
07e30160 DM |
1515 | } |
1516 | ||
757bf1df DM |
1517 | /* Update this model for the CALL stmt, using CTXT to report any |
1518 | diagnostics - the first half. | |
1519 | ||
1520 | Updates to the region_model that should be made *before* sm-states | |
1521 | are updated are done here; other updates to the region_model are done | |
ef7827b0 | 1522 | in region_model::on_call_post. |
757bf1df | 1523 | |
ef7827b0 DM |
1524 | Return true if the function call has unknown side effects (it wasn't |
1525 | recognized and we don't have a body for it, or are unable to tell which | |
6bd31b33 | 1526 | fndecl it is). */ |
ef7827b0 DM |
1527 | |
1528 | bool | |
6bd31b33 | 1529 | region_model::on_call_pre (const gcall *call, region_model_context *ctxt) |
757bf1df | 1530 | { |
48e8a7a6 DM |
1531 | call_details cd (call, this, ctxt); |
1532 | ||
9b4eee5f DM |
1533 | /* Special-case for IFN_DEFERRED_INIT. |
1534 | We want to report uninitialized variables with -fanalyzer (treating | |
1535 | -ftrivial-auto-var-init= as purely a mitigation feature). | |
1536 | Handle IFN_DEFERRED_INIT by treating it as no-op: don't touch the | |
1537 | lhs of the call, so that it is still uninitialized from the point of | |
1538 | view of the analyzer. */ | |
1539 | if (gimple_call_internal_p (call) | |
1540 | && gimple_call_internal_fn (call) == IFN_DEFERRED_INIT) | |
24ebc540 | 1541 | return false; /* No side effects. */ |
9b4eee5f | 1542 | |
bddd8d86 DM |
1543 | /* Get svalues for all of the arguments at the callsite, to ensure that we |
1544 | complain about any uninitialized arguments. This might lead to | |
1545 | duplicates if any of the handling below also looks up the svalues, | |
1546 | but the deduplication code should deal with that. */ | |
1547 | if (ctxt) | |
ca123e01 | 1548 | check_call_args (cd); |
bddd8d86 | 1549 | |
688fc162 DM |
1550 | tree callee_fndecl = get_fndecl_for_call (call, ctxt); |
1551 | ||
48e8a7a6 | 1552 | if (gimple_call_internal_p (call)) |
6bd31b33 DM |
1553 | if (const known_function *kf |
1554 | = get_known_function (gimple_call_internal_fn (call))) | |
1555 | { | |
1556 | kf->impl_call_pre (cd); | |
24ebc540 | 1557 | return false; /* No further side effects. */ |
6bd31b33 | 1558 | } |
808f4dfe | 1559 | |
24ebc540 | 1560 | if (!callee_fndecl) |
73da34a5 DM |
1561 | { |
1562 | cd.set_any_lhs_with_defaults (); | |
1563 | return true; /* Unknown side effects. */ | |
1564 | } | |
ee7bfbe5 | 1565 | |
24ebc540 DM |
1566 | if (const known_function *kf = get_known_function (callee_fndecl, cd)) |
1567 | { | |
1568 | kf->impl_call_pre (cd); | |
1569 | return false; /* No further side effects. */ | |
757bf1df | 1570 | } |
757bf1df | 1571 | |
73da34a5 DM |
1572 | cd.set_any_lhs_with_defaults (); |
1573 | ||
24ebc540 DM |
1574 | const int callee_fndecl_flags = flags_from_decl_or_type (callee_fndecl); |
1575 | if (callee_fndecl_flags & (ECF_CONST | ECF_PURE)) | |
1576 | return false; /* No side effects. */ | |
1577 | ||
1578 | if (fndecl_built_in_p (callee_fndecl)) | |
1579 | return true; /* Unknown side effects. */ | |
1580 | ||
1581 | if (!fndecl_has_gimple_body_p (callee_fndecl)) | |
1582 | return true; /* Unknown side effects. */ | |
1583 | ||
1584 | return false; /* No side effects. */ | |
757bf1df DM |
1585 | } |
1586 | ||
1587 | /* Update this model for the CALL stmt, using CTXT to report any | |
1588 | diagnostics - the second half. | |
1589 | ||
1590 | Updates to the region_model that should be made *after* sm-states | |
1591 | are updated are done here; other updates to the region_model are done | |
ef7827b0 DM |
1592 | in region_model::on_call_pre. |
1593 | ||
1594 | If UNKNOWN_SIDE_EFFECTS is true, also call handle_unrecognized_call | |
1595 | to purge state. */ | |
757bf1df DM |
1596 | |
1597 | void | |
ef7827b0 DM |
1598 | region_model::on_call_post (const gcall *call, |
1599 | bool unknown_side_effects, | |
1600 | region_model_context *ctxt) | |
757bf1df | 1601 | { |
757bf1df | 1602 | if (tree callee_fndecl = get_fndecl_for_call (call, ctxt)) |
1690a839 | 1603 | { |
eafa9d96 | 1604 | call_details cd (call, this, ctxt); |
6bd31b33 | 1605 | if (const known_function *kf = get_known_function (callee_fndecl, cd)) |
55e04240 | 1606 | { |
6bd31b33 | 1607 | kf->impl_call_post (cd); |
55e04240 DM |
1608 | return; |
1609 | } | |
c7e276b8 DM |
1610 | /* Was this fndecl referenced by |
1611 | __attribute__((malloc(FOO)))? */ | |
1612 | if (lookup_attribute ("*dealloc", DECL_ATTRIBUTES (callee_fndecl))) | |
1613 | { | |
c7e276b8 DM |
1614 | impl_deallocation_call (cd); |
1615 | return; | |
1616 | } | |
1690a839 | 1617 | } |
ef7827b0 DM |
1618 | |
1619 | if (unknown_side_effects) | |
1620 | handle_unrecognized_call (call, ctxt); | |
1621 | } | |
1622 | ||
33255ad3 DM |
1623 | /* Purge state involving SVAL from this region_model, using CTXT |
1624 | (if non-NULL) to purge other state in a program_state. | |
1625 | ||
1626 | For example, if we're at the def-stmt of an SSA name, then we need to | |
1627 | purge any state for svalues that involve that SSA name. This avoids | |
1628 | false positives in loops, since a symbolic value referring to the | |
1629 | SSA name will be referring to the previous value of that SSA name. | |
1630 | ||
1631 | For example, in: | |
1632 | while ((e = hashmap_iter_next(&iter))) { | |
1633 | struct oid2strbuf *e_strbuf = (struct oid2strbuf *)e; | |
1634 | free (e_strbuf->value); | |
1635 | } | |
1636 | at the def-stmt of e_8: | |
1637 | e_8 = hashmap_iter_next (&iter); | |
1638 | we should purge the "freed" state of: | |
1639 | INIT_VAL(CAST_REG(‘struct oid2strbuf’, (*INIT_VAL(e_8))).value) | |
1640 | which is the "e_strbuf->value" value from the previous iteration, | |
1641 | or we will erroneously report a double-free - the "e_8" within it | |
1642 | refers to the previous value. */ | |
1643 | ||
1644 | void | |
1645 | region_model::purge_state_involving (const svalue *sval, | |
1646 | region_model_context *ctxt) | |
1647 | { | |
a113b143 DM |
1648 | if (!sval->can_have_associated_state_p ()) |
1649 | return; | |
33255ad3 DM |
1650 | m_store.purge_state_involving (sval, m_mgr); |
1651 | m_constraints->purge_state_involving (sval); | |
1652 | m_dynamic_extents.purge_state_involving (sval); | |
1653 | if (ctxt) | |
1654 | ctxt->purge_state_involving (sval); | |
1655 | } | |
1656 | ||
c65d3c7f DM |
1657 | /* A pending_note subclass for adding a note about an |
1658 | __attribute__((access, ...)) to a diagnostic. */ | |
1659 | ||
1660 | class reason_attr_access : public pending_note_subclass<reason_attr_access> | |
1661 | { | |
1662 | public: | |
1663 | reason_attr_access (tree callee_fndecl, const attr_access &access) | |
1664 | : m_callee_fndecl (callee_fndecl), | |
1665 | m_ptr_argno (access.ptrarg), | |
1666 | m_access_str (TREE_STRING_POINTER (access.to_external_string ())) | |
1667 | { | |
1668 | } | |
1669 | ||
ff171cb1 | 1670 | const char *get_kind () const final override { return "reason_attr_access"; } |
c65d3c7f | 1671 | |
2ac1459f | 1672 | void emit () const final override |
c65d3c7f DM |
1673 | { |
1674 | inform (DECL_SOURCE_LOCATION (m_callee_fndecl), | |
1675 | "parameter %i of %qD marked with attribute %qs", | |
1676 | m_ptr_argno + 1, m_callee_fndecl, m_access_str); | |
1677 | } | |
1678 | ||
1679 | bool operator== (const reason_attr_access &other) const | |
1680 | { | |
1681 | return (m_callee_fndecl == other.m_callee_fndecl | |
1682 | && m_ptr_argno == other.m_ptr_argno | |
1683 | && !strcmp (m_access_str, other.m_access_str)); | |
1684 | } | |
1685 | ||
1686 | private: | |
1687 | tree m_callee_fndecl; | |
1688 | unsigned m_ptr_argno; | |
1689 | const char *m_access_str; | |
1690 | }; | |
1691 | ||
b6eaf90c DM |
1692 | /* Check CALL a call to external function CALLEE_FNDECL based on |
1693 | any __attribute__ ((access, ....) on the latter, complaining to | |
1694 | CTXT about any issues. | |
1695 | ||
1696 | Currently we merely call check_region_for_write on any regions | |
1697 | pointed to by arguments marked with a "write_only" or "read_write" | |
1698 | attribute. */ | |
1699 | ||
1700 | void | |
1701 | region_model:: | |
1702 | check_external_function_for_access_attr (const gcall *call, | |
1703 | tree callee_fndecl, | |
1704 | region_model_context *ctxt) const | |
1705 | { | |
1706 | gcc_assert (call); | |
1707 | gcc_assert (callee_fndecl); | |
1708 | gcc_assert (ctxt); | |
1709 | ||
1710 | tree fntype = TREE_TYPE (callee_fndecl); | |
1711 | if (!fntype) | |
1712 | return; | |
1713 | ||
1714 | if (!TYPE_ATTRIBUTES (fntype)) | |
1715 | return; | |
1716 | ||
1717 | /* Initialize a map of attribute access specifications for arguments | |
1718 | to the function call. */ | |
1719 | rdwr_map rdwr_idx; | |
1720 | init_attr_rdwr_indices (&rdwr_idx, TYPE_ATTRIBUTES (fntype)); | |
1721 | ||
1722 | unsigned argno = 0; | |
1723 | ||
1724 | for (tree iter = TYPE_ARG_TYPES (fntype); iter; | |
1725 | iter = TREE_CHAIN (iter), ++argno) | |
1726 | { | |
1727 | const attr_access* access = rdwr_idx.get (argno); | |
1728 | if (!access) | |
1729 | continue; | |
1730 | ||
1731 | /* Ignore any duplicate entry in the map for the size argument. */ | |
1732 | if (access->ptrarg != argno) | |
1733 | continue; | |
1734 | ||
1735 | if (access->mode == access_write_only | |
1736 | || access->mode == access_read_write) | |
1737 | { | |
e40a935d | 1738 | /* Subclass of annotating_context that |
c65d3c7f | 1739 | adds a note about the attr access to any saved diagnostics. */ |
e40a935d | 1740 | class annotating_ctxt : public annotating_context |
c65d3c7f DM |
1741 | { |
1742 | public: | |
1743 | annotating_ctxt (tree callee_fndecl, | |
1744 | const attr_access &access, | |
1745 | region_model_context *ctxt) | |
e40a935d | 1746 | : annotating_context (ctxt), |
c65d3c7f DM |
1747 | m_callee_fndecl (callee_fndecl), |
1748 | m_access (access) | |
1749 | { | |
1750 | } | |
e40a935d | 1751 | void add_annotations () final override |
c65d3c7f | 1752 | { |
e40a935d DM |
1753 | add_note (make_unique<reason_attr_access> |
1754 | (m_callee_fndecl, m_access)); | |
c65d3c7f DM |
1755 | } |
1756 | private: | |
1757 | tree m_callee_fndecl; | |
1758 | const attr_access &m_access; | |
1759 | }; | |
1760 | ||
1761 | /* Use this ctxt below so that any diagnostics get the | |
1762 | note added to them. */ | |
1763 | annotating_ctxt my_ctxt (callee_fndecl, *access, ctxt); | |
1764 | ||
b6eaf90c | 1765 | tree ptr_tree = gimple_call_arg (call, access->ptrarg); |
c65d3c7f DM |
1766 | const svalue *ptr_sval = get_rvalue (ptr_tree, &my_ctxt); |
1767 | const region *reg = deref_rvalue (ptr_sval, ptr_tree, &my_ctxt); | |
0e466e97 | 1768 | check_region_for_write (reg, nullptr, &my_ctxt); |
b6eaf90c DM |
1769 | /* We don't use the size arg for now. */ |
1770 | } | |
1771 | } | |
1772 | } | |
1773 | ||
ef7827b0 DM |
1774 | /* Handle a call CALL to a function with unknown behavior. |
1775 | ||
1776 | Traverse the regions in this model, determining what regions are | |
1777 | reachable from pointer arguments to CALL and from global variables, | |
1778 | recursively. | |
1779 | ||
1780 | Set all reachable regions to new unknown values and purge sm-state | |
1781 | from their values, and from values that point to them. */ | |
1782 | ||
1783 | void | |
1784 | region_model::handle_unrecognized_call (const gcall *call, | |
1785 | region_model_context *ctxt) | |
1786 | { | |
1787 | tree fndecl = get_fndecl_for_call (call, ctxt); | |
1788 | ||
b6eaf90c DM |
1789 | if (fndecl && ctxt) |
1790 | check_external_function_for_access_attr (call, fndecl, ctxt); | |
1791 | ||
c710051a | 1792 | reachable_regions reachable_regs (this); |
ef7827b0 DM |
1793 | |
1794 | /* Determine the reachable regions and their mutability. */ | |
1795 | { | |
808f4dfe DM |
1796 | /* Add globals and regions that already escaped in previous |
1797 | unknown calls. */ | |
1798 | m_store.for_each_cluster (reachable_regions::init_cluster_cb, | |
1799 | &reachable_regs); | |
ef7827b0 DM |
1800 | |
1801 | /* Params that are pointers. */ | |
1802 | tree iter_param_types = NULL_TREE; | |
1803 | if (fndecl) | |
1804 | iter_param_types = TYPE_ARG_TYPES (TREE_TYPE (fndecl)); | |
1805 | for (unsigned arg_idx = 0; arg_idx < gimple_call_num_args (call); arg_idx++) | |
1806 | { | |
1807 | /* Track expected param type, where available. */ | |
1808 | tree param_type = NULL_TREE; | |
1809 | if (iter_param_types) | |
1810 | { | |
1811 | param_type = TREE_VALUE (iter_param_types); | |
1812 | gcc_assert (param_type); | |
1813 | iter_param_types = TREE_CHAIN (iter_param_types); | |
1814 | } | |
1815 | ||
1816 | tree parm = gimple_call_arg (call, arg_idx); | |
808f4dfe DM |
1817 | const svalue *parm_sval = get_rvalue (parm, ctxt); |
1818 | reachable_regs.handle_parm (parm_sval, param_type); | |
ef7827b0 DM |
1819 | } |
1820 | } | |
1821 | ||
33255ad3 | 1822 | uncertainty_t *uncertainty = ctxt ? ctxt->get_uncertainty () : NULL; |
3a66c289 | 1823 | |
808f4dfe DM |
1824 | /* Purge sm-state for the svalues that were reachable, |
1825 | both in non-mutable and mutable form. */ | |
1826 | for (svalue_set::iterator iter | |
1827 | = reachable_regs.begin_reachable_svals (); | |
1828 | iter != reachable_regs.end_reachable_svals (); ++iter) | |
ef7827b0 | 1829 | { |
808f4dfe | 1830 | const svalue *sval = (*iter); |
33255ad3 DM |
1831 | if (ctxt) |
1832 | ctxt->on_unknown_change (sval, false); | |
808f4dfe DM |
1833 | } |
1834 | for (svalue_set::iterator iter | |
1835 | = reachable_regs.begin_mutable_svals (); | |
1836 | iter != reachable_regs.end_mutable_svals (); ++iter) | |
1837 | { | |
1838 | const svalue *sval = (*iter); | |
33255ad3 DM |
1839 | if (ctxt) |
1840 | ctxt->on_unknown_change (sval, true); | |
3a66c289 DM |
1841 | if (uncertainty) |
1842 | uncertainty->on_mutable_sval_at_unknown_call (sval); | |
808f4dfe | 1843 | } |
ef7827b0 | 1844 | |
808f4dfe | 1845 | /* Mark any clusters that have escaped. */ |
af66094d | 1846 | reachable_regs.mark_escaped_clusters (ctxt); |
ef7827b0 | 1847 | |
808f4dfe DM |
1848 | /* Update bindings for all clusters that have escaped, whether above, |
1849 | or previously. */ | |
3734527d DM |
1850 | m_store.on_unknown_fncall (call, m_mgr->get_store_manager (), |
1851 | conjured_purge (this, ctxt)); | |
9a2c9579 DM |
1852 | |
1853 | /* Purge dynamic extents from any regions that have escaped mutably: | |
1854 | realloc could have been called on them. */ | |
1855 | for (hash_set<const region *>::iterator | |
1856 | iter = reachable_regs.begin_mutable_base_regs (); | |
1857 | iter != reachable_regs.end_mutable_base_regs (); | |
1858 | ++iter) | |
1859 | { | |
1860 | const region *base_reg = (*iter); | |
1861 | unset_dynamic_extents (base_reg); | |
1862 | } | |
808f4dfe | 1863 | } |
ef7827b0 | 1864 | |
808f4dfe DM |
1865 | /* Traverse the regions in this model, determining what regions are |
1866 | reachable from the store and populating *OUT. | |
ef7827b0 | 1867 | |
808f4dfe DM |
1868 | If EXTRA_SVAL is non-NULL, treat it as an additional "root" |
1869 | for reachability (for handling return values from functions when | |
1870 | analyzing return of the only function on the stack). | |
1871 | ||
3a66c289 DM |
1872 | If UNCERTAINTY is non-NULL, treat any svalues that were recorded |
1873 | within it as being maybe-bound as additional "roots" for reachability. | |
1874 | ||
808f4dfe DM |
1875 | Find svalues that haven't leaked. */ |
1876 | ||
1877 | void | |
1878 | region_model::get_reachable_svalues (svalue_set *out, | |
3a66c289 DM |
1879 | const svalue *extra_sval, |
1880 | const uncertainty_t *uncertainty) | |
808f4dfe | 1881 | { |
c710051a | 1882 | reachable_regions reachable_regs (this); |
808f4dfe DM |
1883 | |
1884 | /* Add globals and regions that already escaped in previous | |
1885 | unknown calls. */ | |
1886 | m_store.for_each_cluster (reachable_regions::init_cluster_cb, | |
1887 | &reachable_regs); | |
1888 | ||
1889 | if (extra_sval) | |
1890 | reachable_regs.handle_sval (extra_sval); | |
ef7827b0 | 1891 | |
3a66c289 DM |
1892 | if (uncertainty) |
1893 | for (uncertainty_t::iterator iter | |
1894 | = uncertainty->begin_maybe_bound_svals (); | |
1895 | iter != uncertainty->end_maybe_bound_svals (); ++iter) | |
1896 | reachable_regs.handle_sval (*iter); | |
1897 | ||
808f4dfe DM |
1898 | /* Get regions for locals that have explicitly bound values. */ |
1899 | for (store::cluster_map_t::iterator iter = m_store.begin (); | |
1900 | iter != m_store.end (); ++iter) | |
1901 | { | |
1902 | const region *base_reg = (*iter).first; | |
1903 | if (const region *parent = base_reg->get_parent_region ()) | |
1904 | if (parent->get_kind () == RK_FRAME) | |
1905 | reachable_regs.add (base_reg, false); | |
1906 | } | |
1907 | ||
1908 | /* Populate *OUT based on the values that were reachable. */ | |
1909 | for (svalue_set::iterator iter | |
1910 | = reachable_regs.begin_reachable_svals (); | |
1911 | iter != reachable_regs.end_reachable_svals (); ++iter) | |
1912 | out->add (*iter); | |
757bf1df DM |
1913 | } |
1914 | ||
1915 | /* Update this model for the RETURN_STMT, using CTXT to report any | |
1916 | diagnostics. */ | |
1917 | ||
1918 | void | |
1919 | region_model::on_return (const greturn *return_stmt, region_model_context *ctxt) | |
1920 | { | |
1921 | tree callee = get_current_function ()->decl; | |
1922 | tree lhs = DECL_RESULT (callee); | |
1923 | tree rhs = gimple_return_retval (return_stmt); | |
1924 | ||
1925 | if (lhs && rhs) | |
13ad6d9f DM |
1926 | { |
1927 | const svalue *sval = get_rvalue (rhs, ctxt); | |
1928 | const region *ret_reg = get_lvalue (lhs, ctxt); | |
1929 | set_value (ret_reg, sval, ctxt); | |
1930 | } | |
757bf1df DM |
1931 | } |
1932 | ||
342e14ff DM |
1933 | /* Update this model for a call and return of setjmp/sigsetjmp at CALL within |
1934 | ENODE, using CTXT to report any diagnostics. | |
757bf1df | 1935 | |
342e14ff DM |
1936 | This is for the initial direct invocation of setjmp/sigsetjmp (which returns |
1937 | 0), as opposed to any second return due to longjmp/sigsetjmp. */ | |
757bf1df DM |
1938 | |
1939 | void | |
1940 | region_model::on_setjmp (const gcall *call, const exploded_node *enode, | |
1941 | region_model_context *ctxt) | |
1942 | { | |
808f4dfe DM |
1943 | const svalue *buf_ptr = get_rvalue (gimple_call_arg (call, 0), ctxt); |
1944 | const region *buf_reg = deref_rvalue (buf_ptr, gimple_call_arg (call, 0), | |
1945 | ctxt); | |
757bf1df | 1946 | |
808f4dfe DM |
1947 | /* Create a setjmp_svalue for this call and store it in BUF_REG's |
1948 | region. */ | |
1949 | if (buf_reg) | |
757bf1df | 1950 | { |
fd9982bb | 1951 | setjmp_record r (enode, call); |
808f4dfe DM |
1952 | const svalue *sval |
1953 | = m_mgr->get_or_create_setjmp_svalue (r, buf_reg->get_type ()); | |
1954 | set_value (buf_reg, sval, ctxt); | |
757bf1df DM |
1955 | } |
1956 | ||
1957 | /* Direct calls to setjmp return 0. */ | |
1958 | if (tree lhs = gimple_call_lhs (call)) | |
1959 | { | |
1aff29d4 DM |
1960 | const svalue *new_sval |
1961 | = m_mgr->get_or_create_int_cst (TREE_TYPE (lhs), 0); | |
808f4dfe DM |
1962 | const region *lhs_reg = get_lvalue (lhs, ctxt); |
1963 | set_value (lhs_reg, new_sval, ctxt); | |
757bf1df DM |
1964 | } |
1965 | } | |
1966 | ||
1967 | /* Update this region_model for rewinding from a "longjmp" at LONGJMP_CALL | |
1968 | to a "setjmp" at SETJMP_CALL where the final stack depth should be | |
808f4dfe DM |
1969 | SETJMP_STACK_DEPTH. Pop any stack frames. Leak detection is *not* |
1970 | done, and should be done by the caller. */ | |
757bf1df DM |
1971 | |
1972 | void | |
1973 | region_model::on_longjmp (const gcall *longjmp_call, const gcall *setjmp_call, | |
808f4dfe | 1974 | int setjmp_stack_depth, region_model_context *ctxt) |
757bf1df DM |
1975 | { |
1976 | /* Evaluate the val, using the frame of the "longjmp". */ | |
1977 | tree fake_retval = gimple_call_arg (longjmp_call, 1); | |
808f4dfe | 1978 | const svalue *fake_retval_sval = get_rvalue (fake_retval, ctxt); |
757bf1df DM |
1979 | |
1980 | /* Pop any frames until we reach the stack depth of the function where | |
1981 | setjmp was called. */ | |
1982 | gcc_assert (get_stack_depth () >= setjmp_stack_depth); | |
1983 | while (get_stack_depth () > setjmp_stack_depth) | |
430d7d88 | 1984 | pop_frame (NULL, NULL, ctxt, false); |
757bf1df DM |
1985 | |
1986 | gcc_assert (get_stack_depth () == setjmp_stack_depth); | |
1987 | ||
1988 | /* Assign to LHS of "setjmp" in new_state. */ | |
1989 | if (tree lhs = gimple_call_lhs (setjmp_call)) | |
1990 | { | |
1991 | /* Passing 0 as the val to longjmp leads to setjmp returning 1. */ | |
1aff29d4 DM |
1992 | const svalue *zero_sval |
1993 | = m_mgr->get_or_create_int_cst (TREE_TYPE (fake_retval), 0); | |
808f4dfe | 1994 | tristate eq_zero = eval_condition (fake_retval_sval, EQ_EXPR, zero_sval); |
757bf1df DM |
1995 | /* If we have 0, use 1. */ |
1996 | if (eq_zero.is_true ()) | |
1997 | { | |
808f4dfe | 1998 | const svalue *one_sval |
1aff29d4 | 1999 | = m_mgr->get_or_create_int_cst (TREE_TYPE (fake_retval), 1); |
808f4dfe | 2000 | fake_retval_sval = one_sval; |
757bf1df DM |
2001 | } |
2002 | else | |
2003 | { | |
2004 | /* Otherwise note that the value is nonzero. */ | |
808f4dfe | 2005 | m_constraints->add_constraint (fake_retval_sval, NE_EXPR, zero_sval); |
757bf1df DM |
2006 | } |
2007 | ||
808f4dfe DM |
2008 | /* Decorate the return value from setjmp as being unmergeable, |
2009 | so that we don't attempt to merge states with it as zero | |
2010 | with states in which it's nonzero, leading to a clean distinction | |
2011 | in the exploded_graph betweeen the first return and the second | |
2012 | return. */ | |
2013 | fake_retval_sval = m_mgr->get_or_create_unmergeable (fake_retval_sval); | |
757bf1df | 2014 | |
808f4dfe DM |
2015 | const region *lhs_reg = get_lvalue (lhs, ctxt); |
2016 | set_value (lhs_reg, fake_retval_sval, ctxt); | |
2017 | } | |
757bf1df DM |
2018 | } |
2019 | ||
2020 | /* Update this region_model for a phi stmt of the form | |
2021 | LHS = PHI <...RHS...>. | |
e0a7a675 DM |
2022 | where RHS is for the appropriate edge. |
2023 | Get state from OLD_STATE so that all of the phi stmts for a basic block | |
2024 | are effectively handled simultaneously. */ | |
757bf1df DM |
2025 | |
2026 | void | |
8525d1f5 | 2027 | region_model::handle_phi (const gphi *phi, |
808f4dfe | 2028 | tree lhs, tree rhs, |
e0a7a675 | 2029 | const region_model &old_state, |
757bf1df DM |
2030 | region_model_context *ctxt) |
2031 | { | |
2032 | /* For now, don't bother tracking the .MEM SSA names. */ | |
2033 | if (tree var = SSA_NAME_VAR (lhs)) | |
2034 | if (TREE_CODE (var) == VAR_DECL) | |
2035 | if (VAR_DECL_IS_VIRTUAL_OPERAND (var)) | |
2036 | return; | |
2037 | ||
e0a7a675 DM |
2038 | const svalue *src_sval = old_state.get_rvalue (rhs, ctxt); |
2039 | const region *dst_reg = old_state.get_lvalue (lhs, ctxt); | |
757bf1df | 2040 | |
e0a7a675 | 2041 | set_value (dst_reg, src_sval, ctxt); |
8525d1f5 DM |
2042 | |
2043 | if (ctxt) | |
2044 | ctxt->on_phi (phi, rhs); | |
757bf1df DM |
2045 | } |
2046 | ||
2047 | /* Implementation of region_model::get_lvalue; the latter adds type-checking. | |
2048 | ||
2049 | Get the id of the region for PV within this region_model, | |
2050 | emitting any diagnostics to CTXT. */ | |
2051 | ||
808f4dfe | 2052 | const region * |
53cb324c | 2053 | region_model::get_lvalue_1 (path_var pv, region_model_context *ctxt) const |
757bf1df DM |
2054 | { |
2055 | tree expr = pv.m_tree; | |
2056 | ||
2057 | gcc_assert (expr); | |
2058 | ||
2059 | switch (TREE_CODE (expr)) | |
2060 | { | |
2061 | default: | |
808f4dfe DM |
2062 | return m_mgr->get_region_for_unexpected_tree_code (ctxt, expr, |
2063 | dump_location_t ()); | |
757bf1df DM |
2064 | |
2065 | case ARRAY_REF: | |
2066 | { | |
2067 | tree array = TREE_OPERAND (expr, 0); | |
2068 | tree index = TREE_OPERAND (expr, 1); | |
757bf1df | 2069 | |
808f4dfe DM |
2070 | const region *array_reg = get_lvalue (array, ctxt); |
2071 | const svalue *index_sval = get_rvalue (index, ctxt); | |
2072 | return m_mgr->get_element_region (array_reg, | |
2073 | TREE_TYPE (TREE_TYPE (array)), | |
2074 | index_sval); | |
757bf1df DM |
2075 | } |
2076 | break; | |
2077 | ||
93e759fc DM |
2078 | case BIT_FIELD_REF: |
2079 | { | |
2080 | tree inner_expr = TREE_OPERAND (expr, 0); | |
2081 | const region *inner_reg = get_lvalue (inner_expr, ctxt); | |
2082 | tree num_bits = TREE_OPERAND (expr, 1); | |
2083 | tree first_bit_offset = TREE_OPERAND (expr, 2); | |
2084 | gcc_assert (TREE_CODE (num_bits) == INTEGER_CST); | |
2085 | gcc_assert (TREE_CODE (first_bit_offset) == INTEGER_CST); | |
2086 | bit_range bits (TREE_INT_CST_LOW (first_bit_offset), | |
2087 | TREE_INT_CST_LOW (num_bits)); | |
2088 | return m_mgr->get_bit_range (inner_reg, TREE_TYPE (expr), bits); | |
2089 | } | |
2090 | break; | |
2091 | ||
757bf1df DM |
2092 | case MEM_REF: |
2093 | { | |
2094 | tree ptr = TREE_OPERAND (expr, 0); | |
2095 | tree offset = TREE_OPERAND (expr, 1); | |
808f4dfe DM |
2096 | const svalue *ptr_sval = get_rvalue (ptr, ctxt); |
2097 | const svalue *offset_sval = get_rvalue (offset, ctxt); | |
2098 | const region *star_ptr = deref_rvalue (ptr_sval, ptr, ctxt); | |
2099 | return m_mgr->get_offset_region (star_ptr, | |
2100 | TREE_TYPE (expr), | |
2101 | offset_sval); | |
757bf1df DM |
2102 | } |
2103 | break; | |
2104 | ||
808f4dfe DM |
2105 | case FUNCTION_DECL: |
2106 | return m_mgr->get_region_for_fndecl (expr); | |
2107 | ||
2108 | case LABEL_DECL: | |
2109 | return m_mgr->get_region_for_label (expr); | |
2110 | ||
757bf1df DM |
2111 | case VAR_DECL: |
2112 | /* Handle globals. */ | |
2113 | if (is_global_var (expr)) | |
808f4dfe | 2114 | return m_mgr->get_region_for_global (expr); |
757bf1df DM |
2115 | |
2116 | /* Fall through. */ | |
2117 | ||
2118 | case SSA_NAME: | |
2119 | case PARM_DECL: | |
2120 | case RESULT_DECL: | |
2121 | { | |
2122 | gcc_assert (TREE_CODE (expr) == SSA_NAME | |
2123 | || TREE_CODE (expr) == PARM_DECL | |
778aca1b | 2124 | || VAR_P (expr) |
757bf1df DM |
2125 | || TREE_CODE (expr) == RESULT_DECL); |
2126 | ||
808f4dfe DM |
2127 | int stack_index = pv.m_stack_depth; |
2128 | const frame_region *frame = get_frame_at_index (stack_index); | |
757bf1df | 2129 | gcc_assert (frame); |
4cebae09 | 2130 | return frame->get_region_for_local (m_mgr, expr, ctxt); |
757bf1df DM |
2131 | } |
2132 | ||
2133 | case COMPONENT_REF: | |
2134 | { | |
2135 | /* obj.field */ | |
2136 | tree obj = TREE_OPERAND (expr, 0); | |
2137 | tree field = TREE_OPERAND (expr, 1); | |
808f4dfe DM |
2138 | const region *obj_reg = get_lvalue (obj, ctxt); |
2139 | return m_mgr->get_field_region (obj_reg, field); | |
41a9e940 DM |
2140 | } |
2141 | break; | |
2142 | ||
757bf1df | 2143 | case STRING_CST: |
808f4dfe | 2144 | return m_mgr->get_region_for_string (expr); |
757bf1df DM |
2145 | } |
2146 | } | |
2147 | ||
2148 | /* Assert that SRC_TYPE can be converted to DST_TYPE as a no-op. */ | |
2149 | ||
09bea584 DM |
2150 | static void |
2151 | assert_compat_types (tree src_type, tree dst_type) | |
2152 | { | |
2153 | if (src_type && dst_type && !VOID_TYPE_P (dst_type)) | |
808f4dfe DM |
2154 | { |
2155 | #if CHECKING_P | |
2156 | if (!(useless_type_conversion_p (src_type, dst_type))) | |
2157 | internal_error ("incompatible types: %qT and %qT", src_type, dst_type); | |
2158 | #endif | |
2159 | } | |
09bea584 | 2160 | } |
757bf1df | 2161 | |
ea4e3218 DM |
2162 | /* Return true if SRC_TYPE can be converted to DST_TYPE as a no-op. */ |
2163 | ||
e66b9f67 | 2164 | bool |
ea4e3218 DM |
2165 | compat_types_p (tree src_type, tree dst_type) |
2166 | { | |
2167 | if (src_type && dst_type && !VOID_TYPE_P (dst_type)) | |
2168 | if (!(useless_type_conversion_p (src_type, dst_type))) | |
2169 | return false; | |
2170 | return true; | |
2171 | } | |
2172 | ||
808f4dfe | 2173 | /* Get the region for PV within this region_model, |
757bf1df DM |
2174 | emitting any diagnostics to CTXT. */ |
2175 | ||
808f4dfe | 2176 | const region * |
53cb324c | 2177 | region_model::get_lvalue (path_var pv, region_model_context *ctxt) const |
757bf1df DM |
2178 | { |
2179 | if (pv.m_tree == NULL_TREE) | |
808f4dfe | 2180 | return NULL; |
757bf1df | 2181 | |
808f4dfe DM |
2182 | const region *result_reg = get_lvalue_1 (pv, ctxt); |
2183 | assert_compat_types (result_reg->get_type (), TREE_TYPE (pv.m_tree)); | |
2184 | return result_reg; | |
757bf1df DM |
2185 | } |
2186 | ||
808f4dfe | 2187 | /* Get the region for EXPR within this region_model (assuming the most |
757bf1df DM |
2188 | recent stack frame if it's a local). */ |
2189 | ||
808f4dfe | 2190 | const region * |
53cb324c | 2191 | region_model::get_lvalue (tree expr, region_model_context *ctxt) const |
757bf1df DM |
2192 | { |
2193 | return get_lvalue (path_var (expr, get_stack_depth () - 1), ctxt); | |
2194 | } | |
2195 | ||
2196 | /* Implementation of region_model::get_rvalue; the latter adds type-checking. | |
2197 | ||
2198 | Get the value of PV within this region_model, | |
2199 | emitting any diagnostics to CTXT. */ | |
2200 | ||
808f4dfe | 2201 | const svalue * |
53cb324c | 2202 | region_model::get_rvalue_1 (path_var pv, region_model_context *ctxt) const |
757bf1df DM |
2203 | { |
2204 | gcc_assert (pv.m_tree); | |
2205 | ||
2206 | switch (TREE_CODE (pv.m_tree)) | |
2207 | { | |
2208 | default: | |
2242b975 | 2209 | return m_mgr->get_or_create_unknown_svalue (TREE_TYPE (pv.m_tree)); |
757bf1df DM |
2210 | |
2211 | case ADDR_EXPR: | |
2212 | { | |
2213 | /* "&EXPR". */ | |
2214 | tree expr = pv.m_tree; | |
2215 | tree op0 = TREE_OPERAND (expr, 0); | |
808f4dfe DM |
2216 | const region *expr_reg = get_lvalue (op0, ctxt); |
2217 | return m_mgr->get_ptr_svalue (TREE_TYPE (expr), expr_reg); | |
757bf1df DM |
2218 | } |
2219 | break; | |
2220 | ||
808f4dfe | 2221 | case BIT_FIELD_REF: |
d3b1ef7a DM |
2222 | { |
2223 | tree expr = pv.m_tree; | |
2224 | tree op0 = TREE_OPERAND (expr, 0); | |
2225 | const region *reg = get_lvalue (op0, ctxt); | |
2226 | tree num_bits = TREE_OPERAND (expr, 1); | |
2227 | tree first_bit_offset = TREE_OPERAND (expr, 2); | |
2228 | gcc_assert (TREE_CODE (num_bits) == INTEGER_CST); | |
2229 | gcc_assert (TREE_CODE (first_bit_offset) == INTEGER_CST); | |
2230 | bit_range bits (TREE_INT_CST_LOW (first_bit_offset), | |
2231 | TREE_INT_CST_LOW (num_bits)); | |
9faf8348 | 2232 | return get_rvalue_for_bits (TREE_TYPE (expr), reg, bits, ctxt); |
d3b1ef7a | 2233 | } |
808f4dfe | 2234 | |
808f4dfe | 2235 | case VAR_DECL: |
20bd258d DM |
2236 | if (DECL_HARD_REGISTER (pv.m_tree)) |
2237 | { | |
2238 | /* If it has a hard register, it doesn't have a memory region | |
2239 | and can't be referred to as an lvalue. */ | |
2240 | return m_mgr->get_or_create_unknown_svalue (TREE_TYPE (pv.m_tree)); | |
2241 | } | |
2242 | /* Fall through. */ | |
808f4dfe | 2243 | case PARM_DECL: |
20bd258d | 2244 | case SSA_NAME: |
808f4dfe | 2245 | case RESULT_DECL: |
757bf1df DM |
2246 | case ARRAY_REF: |
2247 | { | |
da7c2773 | 2248 | const region *reg = get_lvalue (pv, ctxt); |
9faf8348 | 2249 | return get_store_value (reg, ctxt); |
757bf1df DM |
2250 | } |
2251 | ||
808f4dfe DM |
2252 | case REALPART_EXPR: |
2253 | case IMAGPART_EXPR: | |
2254 | case VIEW_CONVERT_EXPR: | |
2255 | { | |
2256 | tree expr = pv.m_tree; | |
2257 | tree arg = TREE_OPERAND (expr, 0); | |
2258 | const svalue *arg_sval = get_rvalue (arg, ctxt); | |
2259 | const svalue *sval_unaryop | |
2260 | = m_mgr->get_or_create_unaryop (TREE_TYPE (expr), TREE_CODE (expr), | |
2261 | arg_sval); | |
2262 | return sval_unaryop; | |
2263 | }; | |
2264 | ||
757bf1df DM |
2265 | case INTEGER_CST: |
2266 | case REAL_CST: | |
808f4dfe DM |
2267 | case COMPLEX_CST: |
2268 | case VECTOR_CST: | |
757bf1df | 2269 | case STRING_CST: |
808f4dfe DM |
2270 | return m_mgr->get_or_create_constant_svalue (pv.m_tree); |
2271 | ||
2272 | case POINTER_PLUS_EXPR: | |
2273 | { | |
2274 | tree expr = pv.m_tree; | |
2275 | tree ptr = TREE_OPERAND (expr, 0); | |
2276 | tree offset = TREE_OPERAND (expr, 1); | |
2277 | const svalue *ptr_sval = get_rvalue (ptr, ctxt); | |
2278 | const svalue *offset_sval = get_rvalue (offset, ctxt); | |
2279 | const svalue *sval_binop | |
2280 | = m_mgr->get_or_create_binop (TREE_TYPE (expr), POINTER_PLUS_EXPR, | |
2281 | ptr_sval, offset_sval); | |
2282 | return sval_binop; | |
2283 | } | |
2284 | ||
2285 | /* Binary ops. */ | |
2286 | case PLUS_EXPR: | |
2287 | case MULT_EXPR: | |
4d3b7be2 DM |
2288 | case BIT_AND_EXPR: |
2289 | case BIT_IOR_EXPR: | |
2290 | case BIT_XOR_EXPR: | |
808f4dfe DM |
2291 | { |
2292 | tree expr = pv.m_tree; | |
2293 | tree arg0 = TREE_OPERAND (expr, 0); | |
2294 | tree arg1 = TREE_OPERAND (expr, 1); | |
2295 | const svalue *arg0_sval = get_rvalue (arg0, ctxt); | |
2296 | const svalue *arg1_sval = get_rvalue (arg1, ctxt); | |
2297 | const svalue *sval_binop | |
2298 | = m_mgr->get_or_create_binop (TREE_TYPE (expr), TREE_CODE (expr), | |
2299 | arg0_sval, arg1_sval); | |
2300 | return sval_binop; | |
2301 | } | |
757bf1df DM |
2302 | |
2303 | case COMPONENT_REF: | |
2304 | case MEM_REF: | |
757bf1df | 2305 | { |
808f4dfe | 2306 | const region *ref_reg = get_lvalue (pv, ctxt); |
9faf8348 | 2307 | return get_store_value (ref_reg, ctxt); |
757bf1df | 2308 | } |
1b342485 AS |
2309 | case OBJ_TYPE_REF: |
2310 | { | |
2311 | tree expr = OBJ_TYPE_REF_EXPR (pv.m_tree); | |
2312 | return get_rvalue (expr, ctxt); | |
2313 | } | |
757bf1df DM |
2314 | } |
2315 | } | |
2316 | ||
2317 | /* Get the value of PV within this region_model, | |
2318 | emitting any diagnostics to CTXT. */ | |
2319 | ||
808f4dfe | 2320 | const svalue * |
53cb324c | 2321 | region_model::get_rvalue (path_var pv, region_model_context *ctxt) const |
757bf1df DM |
2322 | { |
2323 | if (pv.m_tree == NULL_TREE) | |
808f4dfe | 2324 | return NULL; |
757bf1df | 2325 | |
808f4dfe | 2326 | const svalue *result_sval = get_rvalue_1 (pv, ctxt); |
757bf1df | 2327 | |
808f4dfe DM |
2328 | assert_compat_types (result_sval->get_type (), TREE_TYPE (pv.m_tree)); |
2329 | ||
2fdc8546 | 2330 | result_sval = check_for_poison (result_sval, pv.m_tree, NULL, ctxt); |
33255ad3 | 2331 | |
808f4dfe | 2332 | return result_sval; |
757bf1df DM |
2333 | } |
2334 | ||
2335 | /* Get the value of EXPR within this region_model (assuming the most | |
2336 | recent stack frame if it's a local). */ | |
2337 | ||
808f4dfe | 2338 | const svalue * |
53cb324c | 2339 | region_model::get_rvalue (tree expr, region_model_context *ctxt) const |
757bf1df DM |
2340 | { |
2341 | return get_rvalue (path_var (expr, get_stack_depth () - 1), ctxt); | |
2342 | } | |
2343 | ||
623bc027 DM |
2344 | /* Return true if this model is on a path with "main" as the entrypoint |
2345 | (as opposed to one in which we're merely analyzing a subset of the | |
2346 | path through the code). */ | |
2347 | ||
2348 | bool | |
2349 | region_model::called_from_main_p () const | |
2350 | { | |
2351 | if (!m_current_frame) | |
2352 | return false; | |
2353 | /* Determine if the oldest stack frame in this model is for "main". */ | |
2354 | const frame_region *frame0 = get_frame_at_index (0); | |
2355 | gcc_assert (frame0); | |
2356 | return id_equal (DECL_NAME (frame0->get_function ()->decl), "main"); | |
2357 | } | |
2358 | ||
2359 | /* Subroutine of region_model::get_store_value for when REG is (or is within) | |
2360 | a global variable that hasn't been touched since the start of this path | |
2361 | (or was implicitly touched due to a call to an unknown function). */ | |
2362 | ||
2363 | const svalue * | |
2364 | region_model::get_initial_value_for_global (const region *reg) const | |
2365 | { | |
2366 | /* Get the decl that REG is for (or is within). */ | |
2367 | const decl_region *base_reg | |
2368 | = reg->get_base_region ()->dyn_cast_decl_region (); | |
2369 | gcc_assert (base_reg); | |
2370 | tree decl = base_reg->get_decl (); | |
2371 | ||
2372 | /* Special-case: to avoid having to explicitly update all previously | |
2373 | untracked globals when calling an unknown fn, they implicitly have | |
2374 | an unknown value if an unknown call has occurred, unless this is | |
2375 | static to-this-TU and hasn't escaped. Globals that have escaped | |
2376 | are explicitly tracked, so we shouldn't hit this case for them. */ | |
af66094d DM |
2377 | if (m_store.called_unknown_fn_p () |
2378 | && TREE_PUBLIC (decl) | |
2379 | && !TREE_READONLY (decl)) | |
623bc027 DM |
2380 | return m_mgr->get_or_create_unknown_svalue (reg->get_type ()); |
2381 | ||
2382 | /* If we are on a path from the entrypoint from "main" and we have a | |
2383 | global decl defined in this TU that hasn't been touched yet, then | |
2384 | the initial value of REG can be taken from the initialization value | |
2385 | of the decl. */ | |
16ad9ae8 | 2386 | if (called_from_main_p () || TREE_READONLY (decl)) |
fe9771b5 | 2387 | return reg->get_initial_value_at_main (m_mgr); |
623bc027 DM |
2388 | |
2389 | /* Otherwise, return INIT_VAL(REG). */ | |
2390 | return m_mgr->get_or_create_initial_value (reg); | |
2391 | } | |
2392 | ||
808f4dfe | 2393 | /* Get a value for REG, looking it up in the store, or otherwise falling |
9faf8348 DM |
2394 | back to "initial" or "unknown" values. |
2395 | Use CTXT to report any warnings associated with reading from REG. */ | |
757bf1df | 2396 | |
808f4dfe | 2397 | const svalue * |
9faf8348 DM |
2398 | region_model::get_store_value (const region *reg, |
2399 | region_model_context *ctxt) const | |
757bf1df | 2400 | { |
dfe2ef7f DM |
2401 | /* Getting the value of an empty region gives an unknown_svalue. */ |
2402 | if (reg->empty_p ()) | |
2403 | return m_mgr->get_or_create_unknown_svalue (reg->get_type ()); | |
2404 | ||
1eb90f46 | 2405 | bool check_poisoned = true; |
9589a46d | 2406 | if (check_region_for_read (reg, ctxt)) |
1eb90f46 | 2407 | check_poisoned = false; |
9faf8348 | 2408 | |
2867118d DM |
2409 | /* Special-case: handle var_decls in the constant pool. */ |
2410 | if (const decl_region *decl_reg = reg->dyn_cast_decl_region ()) | |
2411 | if (const svalue *sval = decl_reg->maybe_get_constant_value (m_mgr)) | |
2412 | return sval; | |
2413 | ||
808f4dfe DM |
2414 | const svalue *sval |
2415 | = m_store.get_any_binding (m_mgr->get_store_manager (), reg); | |
2416 | if (sval) | |
757bf1df | 2417 | { |
808f4dfe DM |
2418 | if (reg->get_type ()) |
2419 | sval = m_mgr->get_or_create_cast (reg->get_type (), sval); | |
2420 | return sval; | |
757bf1df | 2421 | } |
757bf1df | 2422 | |
808f4dfe DM |
2423 | /* Special-case: read at a constant index within a STRING_CST. */ |
2424 | if (const offset_region *offset_reg = reg->dyn_cast_offset_region ()) | |
2425 | if (tree byte_offset_cst | |
2426 | = offset_reg->get_byte_offset ()->maybe_get_constant ()) | |
2427 | if (const string_region *str_reg | |
2428 | = reg->get_parent_region ()->dyn_cast_string_region ()) | |
757bf1df | 2429 | { |
808f4dfe DM |
2430 | tree string_cst = str_reg->get_string_cst (); |
2431 | if (const svalue *char_sval | |
2432 | = m_mgr->maybe_get_char_from_string_cst (string_cst, | |
2433 | byte_offset_cst)) | |
2434 | return m_mgr->get_or_create_cast (reg->get_type (), char_sval); | |
757bf1df | 2435 | } |
757bf1df | 2436 | |
808f4dfe DM |
2437 | /* Special-case: read the initial char of a STRING_CST. */ |
2438 | if (const cast_region *cast_reg = reg->dyn_cast_cast_region ()) | |
2439 | if (const string_region *str_reg | |
2440 | = cast_reg->get_original_region ()->dyn_cast_string_region ()) | |
2441 | { | |
2442 | tree string_cst = str_reg->get_string_cst (); | |
2443 | tree byte_offset_cst = build_int_cst (integer_type_node, 0); | |
2444 | if (const svalue *char_sval | |
2445 | = m_mgr->maybe_get_char_from_string_cst (string_cst, | |
2446 | byte_offset_cst)) | |
2447 | return m_mgr->get_or_create_cast (reg->get_type (), char_sval); | |
2448 | } | |
757bf1df | 2449 | |
808f4dfe DM |
2450 | /* Otherwise we implicitly have the initial value of the region |
2451 | (if the cluster had been touched, binding_cluster::get_any_binding, | |
2452 | would have returned UNKNOWN, and we would already have returned | |
2453 | that above). */ | |
757bf1df | 2454 | |
623bc027 DM |
2455 | /* Handle globals. */ |
2456 | if (reg->get_base_region ()->get_parent_region ()->get_kind () | |
2457 | == RK_GLOBALS) | |
2458 | return get_initial_value_for_global (reg); | |
757bf1df | 2459 | |
1eb90f46 | 2460 | return m_mgr->get_or_create_initial_value (reg, check_poisoned); |
757bf1df DM |
2461 | } |
2462 | ||
808f4dfe DM |
2463 | /* Return false if REG does not exist, true if it may do. |
2464 | This is for detecting regions within the stack that don't exist anymore | |
2465 | after frames are popped. */ | |
757bf1df | 2466 | |
808f4dfe DM |
2467 | bool |
2468 | region_model::region_exists_p (const region *reg) const | |
757bf1df | 2469 | { |
808f4dfe DM |
2470 | /* If within a stack frame, check that the stack frame is live. */ |
2471 | if (const frame_region *enclosing_frame = reg->maybe_get_frame_region ()) | |
757bf1df | 2472 | { |
808f4dfe DM |
2473 | /* Check that the current frame is the enclosing frame, or is called |
2474 | by it. */ | |
2475 | for (const frame_region *iter_frame = get_current_frame (); iter_frame; | |
2476 | iter_frame = iter_frame->get_calling_frame ()) | |
2477 | if (iter_frame == enclosing_frame) | |
2478 | return true; | |
2479 | return false; | |
757bf1df | 2480 | } |
808f4dfe DM |
2481 | |
2482 | return true; | |
757bf1df DM |
2483 | } |
2484 | ||
808f4dfe DM |
2485 | /* Get a region for referencing PTR_SVAL, creating a region if need be, and |
2486 | potentially generating warnings via CTXT. | |
35e3f082 | 2487 | PTR_SVAL must be of pointer type. |
808f4dfe | 2488 | PTR_TREE if non-NULL can be used when emitting diagnostics. */ |
757bf1df | 2489 | |
808f4dfe DM |
2490 | const region * |
2491 | region_model::deref_rvalue (const svalue *ptr_sval, tree ptr_tree, | |
021077b9 DM |
2492 | region_model_context *ctxt, |
2493 | bool add_nonnull_constraint) const | |
757bf1df | 2494 | { |
808f4dfe | 2495 | gcc_assert (ptr_sval); |
35e3f082 | 2496 | gcc_assert (POINTER_TYPE_P (ptr_sval->get_type ())); |
757bf1df | 2497 | |
49bfbf18 DM |
2498 | /* If we're dereferencing PTR_SVAL, assume that it is non-NULL; add this |
2499 | as a constraint. This suppresses false positives from | |
2500 | -Wanalyzer-null-dereference for the case where we later have an | |
2501 | if (PTR_SVAL) that would occur if we considered the false branch | |
2502 | and transitioned the malloc state machine from start->null. */ | |
021077b9 DM |
2503 | if (add_nonnull_constraint) |
2504 | { | |
2505 | tree null_ptr_cst = build_int_cst (ptr_sval->get_type (), 0); | |
2506 | const svalue *null_ptr | |
2507 | = m_mgr->get_or_create_constant_svalue (null_ptr_cst); | |
2508 | m_constraints->add_constraint (ptr_sval, NE_EXPR, null_ptr); | |
2509 | } | |
49bfbf18 | 2510 | |
808f4dfe | 2511 | switch (ptr_sval->get_kind ()) |
757bf1df | 2512 | { |
808f4dfe | 2513 | default: |
23ebfda0 | 2514 | break; |
808f4dfe | 2515 | |
757bf1df DM |
2516 | case SK_REGION: |
2517 | { | |
808f4dfe DM |
2518 | const region_svalue *region_sval |
2519 | = as_a <const region_svalue *> (ptr_sval); | |
757bf1df DM |
2520 | return region_sval->get_pointee (); |
2521 | } | |
2522 | ||
808f4dfe DM |
2523 | case SK_BINOP: |
2524 | { | |
2525 | const binop_svalue *binop_sval | |
2526 | = as_a <const binop_svalue *> (ptr_sval); | |
2527 | switch (binop_sval->get_op ()) | |
2528 | { | |
2529 | case POINTER_PLUS_EXPR: | |
2530 | { | |
2531 | /* If we have a symbolic value expressing pointer arithmentic, | |
2532 | try to convert it to a suitable region. */ | |
2533 | const region *parent_region | |
2534 | = deref_rvalue (binop_sval->get_arg0 (), NULL_TREE, ctxt); | |
2535 | const svalue *offset = binop_sval->get_arg1 (); | |
2536 | tree type= TREE_TYPE (ptr_sval->get_type ()); | |
2537 | return m_mgr->get_offset_region (parent_region, type, offset); | |
2538 | } | |
2539 | default: | |
23ebfda0 | 2540 | break; |
808f4dfe DM |
2541 | } |
2542 | } | |
23ebfda0 | 2543 | break; |
757bf1df DM |
2544 | |
2545 | case SK_POISONED: | |
2546 | { | |
2547 | if (ctxt) | |
808f4dfe DM |
2548 | { |
2549 | tree ptr = get_representative_tree (ptr_sval); | |
2550 | /* If we can't get a representative tree for PTR_SVAL | |
2551 | (e.g. if it hasn't been bound into the store), then | |
2552 | fall back on PTR_TREE, if non-NULL. */ | |
2553 | if (!ptr) | |
2554 | ptr = ptr_tree; | |
2555 | if (ptr) | |
2556 | { | |
2557 | const poisoned_svalue *poisoned_sval | |
2558 | = as_a <const poisoned_svalue *> (ptr_sval); | |
2559 | enum poison_kind pkind = poisoned_sval->get_poison_kind (); | |
0e466e97 DM |
2560 | ctxt->warn (::make_unique<poisoned_value_diagnostic> |
2561 | (ptr, pkind, nullptr, nullptr)); | |
808f4dfe DM |
2562 | } |
2563 | } | |
757bf1df | 2564 | } |
23ebfda0 | 2565 | break; |
757bf1df DM |
2566 | } |
2567 | ||
23ebfda0 | 2568 | return m_mgr->get_symbolic_region (ptr_sval); |
757bf1df DM |
2569 | } |
2570 | ||
d3b1ef7a DM |
2571 | /* Attempt to get BITS within any value of REG, as TYPE. |
2572 | In particular, extract values from compound_svalues for the case | |
2573 | where there's a concrete binding at BITS. | |
9faf8348 DM |
2574 | Return an unknown svalue if we can't handle the given case. |
2575 | Use CTXT to report any warnings associated with reading from REG. */ | |
d3b1ef7a DM |
2576 | |
2577 | const svalue * | |
2578 | region_model::get_rvalue_for_bits (tree type, | |
2579 | const region *reg, | |
9faf8348 DM |
2580 | const bit_range &bits, |
2581 | region_model_context *ctxt) const | |
d3b1ef7a | 2582 | { |
9faf8348 | 2583 | const svalue *sval = get_store_value (reg, ctxt); |
e61ffa20 | 2584 | return m_mgr->get_or_create_bits_within (type, bits, sval); |
d3b1ef7a DM |
2585 | } |
2586 | ||
3175d40f DM |
2587 | /* A subclass of pending_diagnostic for complaining about writes to |
2588 | constant regions of memory. */ | |
2589 | ||
2590 | class write_to_const_diagnostic | |
2591 | : public pending_diagnostic_subclass<write_to_const_diagnostic> | |
2592 | { | |
2593 | public: | |
2594 | write_to_const_diagnostic (const region *reg, tree decl) | |
2595 | : m_reg (reg), m_decl (decl) | |
2596 | {} | |
2597 | ||
ff171cb1 | 2598 | const char *get_kind () const final override |
3175d40f DM |
2599 | { |
2600 | return "write_to_const_diagnostic"; | |
2601 | } | |
2602 | ||
2603 | bool operator== (const write_to_const_diagnostic &other) const | |
2604 | { | |
2605 | return (m_reg == other.m_reg | |
2606 | && m_decl == other.m_decl); | |
2607 | } | |
2608 | ||
ff171cb1 | 2609 | int get_controlling_option () const final override |
7fd6e36e DM |
2610 | { |
2611 | return OPT_Wanalyzer_write_to_const; | |
2612 | } | |
2613 | ||
0e466e97 | 2614 | bool emit (rich_location *rich_loc, logger *) final override |
3175d40f | 2615 | { |
111fd515 DM |
2616 | auto_diagnostic_group d; |
2617 | bool warned; | |
2618 | switch (m_reg->get_kind ()) | |
2619 | { | |
2620 | default: | |
7fd6e36e | 2621 | warned = warning_at (rich_loc, get_controlling_option (), |
111fd515 DM |
2622 | "write to %<const%> object %qE", m_decl); |
2623 | break; | |
2624 | case RK_FUNCTION: | |
7fd6e36e | 2625 | warned = warning_at (rich_loc, get_controlling_option (), |
111fd515 DM |
2626 | "write to function %qE", m_decl); |
2627 | break; | |
2628 | case RK_LABEL: | |
7fd6e36e | 2629 | warned = warning_at (rich_loc, get_controlling_option (), |
111fd515 DM |
2630 | "write to label %qE", m_decl); |
2631 | break; | |
2632 | } | |
3175d40f DM |
2633 | if (warned) |
2634 | inform (DECL_SOURCE_LOCATION (m_decl), "declared here"); | |
2635 | return warned; | |
2636 | } | |
2637 | ||
ff171cb1 | 2638 | label_text describe_final_event (const evdesc::final_event &ev) final override |
3175d40f | 2639 | { |
111fd515 DM |
2640 | switch (m_reg->get_kind ()) |
2641 | { | |
2642 | default: | |
2643 | return ev.formatted_print ("write to %<const%> object %qE here", m_decl); | |
2644 | case RK_FUNCTION: | |
2645 | return ev.formatted_print ("write to function %qE here", m_decl); | |
2646 | case RK_LABEL: | |
2647 | return ev.formatted_print ("write to label %qE here", m_decl); | |
2648 | } | |
3175d40f DM |
2649 | } |
2650 | ||
2651 | private: | |
2652 | const region *m_reg; | |
2653 | tree m_decl; | |
2654 | }; | |
2655 | ||
2656 | /* A subclass of pending_diagnostic for complaining about writes to | |
2657 | string literals. */ | |
2658 | ||
2659 | class write_to_string_literal_diagnostic | |
2660 | : public pending_diagnostic_subclass<write_to_string_literal_diagnostic> | |
2661 | { | |
2662 | public: | |
2663 | write_to_string_literal_diagnostic (const region *reg) | |
2664 | : m_reg (reg) | |
2665 | {} | |
2666 | ||
ff171cb1 | 2667 | const char *get_kind () const final override |
3175d40f DM |
2668 | { |
2669 | return "write_to_string_literal_diagnostic"; | |
2670 | } | |
2671 | ||
2672 | bool operator== (const write_to_string_literal_diagnostic &other) const | |
2673 | { | |
2674 | return m_reg == other.m_reg; | |
2675 | } | |
2676 | ||
ff171cb1 | 2677 | int get_controlling_option () const final override |
7fd6e36e DM |
2678 | { |
2679 | return OPT_Wanalyzer_write_to_string_literal; | |
2680 | } | |
2681 | ||
0e466e97 | 2682 | bool emit (rich_location *rich_loc, logger *) final override |
3175d40f | 2683 | { |
7fd6e36e | 2684 | return warning_at (rich_loc, get_controlling_option (), |
3175d40f DM |
2685 | "write to string literal"); |
2686 | /* Ideally we would show the location of the STRING_CST as well, | |
2687 | but it is not available at this point. */ | |
2688 | } | |
2689 | ||
ff171cb1 | 2690 | label_text describe_final_event (const evdesc::final_event &ev) final override |
3175d40f DM |
2691 | { |
2692 | return ev.formatted_print ("write to string literal here"); | |
2693 | } | |
2694 | ||
2695 | private: | |
2696 | const region *m_reg; | |
2697 | }; | |
2698 | ||
2699 | /* Use CTXT to warn If DEST_REG is a region that shouldn't be written to. */ | |
2700 | ||
2701 | void | |
2702 | region_model::check_for_writable_region (const region* dest_reg, | |
2703 | region_model_context *ctxt) const | |
2704 | { | |
2705 | /* Fail gracefully if CTXT is NULL. */ | |
2706 | if (!ctxt) | |
2707 | return; | |
2708 | ||
2709 | const region *base_reg = dest_reg->get_base_region (); | |
2710 | switch (base_reg->get_kind ()) | |
2711 | { | |
2712 | default: | |
2713 | break; | |
111fd515 DM |
2714 | case RK_FUNCTION: |
2715 | { | |
2716 | const function_region *func_reg = as_a <const function_region *> (base_reg); | |
2717 | tree fndecl = func_reg->get_fndecl (); | |
6341f14e DM |
2718 | ctxt->warn (make_unique<write_to_const_diagnostic> |
2719 | (func_reg, fndecl)); | |
111fd515 DM |
2720 | } |
2721 | break; | |
2722 | case RK_LABEL: | |
2723 | { | |
2724 | const label_region *label_reg = as_a <const label_region *> (base_reg); | |
2725 | tree label = label_reg->get_label (); | |
6341f14e DM |
2726 | ctxt->warn (make_unique<write_to_const_diagnostic> |
2727 | (label_reg, label)); | |
111fd515 DM |
2728 | } |
2729 | break; | |
3175d40f DM |
2730 | case RK_DECL: |
2731 | { | |
2732 | const decl_region *decl_reg = as_a <const decl_region *> (base_reg); | |
2733 | tree decl = decl_reg->get_decl (); | |
2734 | /* Warn about writes to const globals. | |
2735 | Don't warn for writes to const locals, and params in particular, | |
2736 | since we would warn in push_frame when setting them up (e.g the | |
2737 | "this" param is "T* const"). */ | |
2738 | if (TREE_READONLY (decl) | |
2739 | && is_global_var (decl)) | |
6341f14e | 2740 | ctxt->warn (make_unique<write_to_const_diagnostic> (dest_reg, decl)); |
3175d40f DM |
2741 | } |
2742 | break; | |
2743 | case RK_STRING: | |
6341f14e | 2744 | ctxt->warn (make_unique<write_to_string_literal_diagnostic> (dest_reg)); |
3175d40f DM |
2745 | break; |
2746 | } | |
2747 | } | |
2748 | ||
9a2c9579 DM |
2749 | /* Get the capacity of REG in bytes. */ |
2750 | ||
2751 | const svalue * | |
2752 | region_model::get_capacity (const region *reg) const | |
2753 | { | |
2754 | switch (reg->get_kind ()) | |
2755 | { | |
2756 | default: | |
2757 | break; | |
2758 | case RK_DECL: | |
2759 | { | |
2760 | const decl_region *decl_reg = as_a <const decl_region *> (reg); | |
2761 | tree decl = decl_reg->get_decl (); | |
2762 | if (TREE_CODE (decl) == SSA_NAME) | |
2763 | { | |
2764 | tree type = TREE_TYPE (decl); | |
2765 | tree size = TYPE_SIZE (type); | |
2766 | return get_rvalue (size, NULL); | |
2767 | } | |
2768 | else | |
2769 | { | |
2770 | tree size = decl_init_size (decl, false); | |
2771 | if (size) | |
2772 | return get_rvalue (size, NULL); | |
2773 | } | |
2774 | } | |
2775 | break; | |
e61ffa20 DM |
2776 | case RK_SIZED: |
2777 | /* Look through sized regions to get at the capacity | |
2778 | of the underlying regions. */ | |
2779 | return get_capacity (reg->get_parent_region ()); | |
0e466e97 DM |
2780 | case RK_STRING: |
2781 | { | |
2782 | /* "Capacity" here means "size". */ | |
2783 | const string_region *string_reg = as_a <const string_region *> (reg); | |
2784 | tree string_cst = string_reg->get_string_cst (); | |
2785 | return m_mgr->get_or_create_int_cst (size_type_node, | |
2786 | TREE_STRING_LENGTH (string_cst)); | |
2787 | } | |
2788 | break; | |
9a2c9579 DM |
2789 | } |
2790 | ||
2791 | if (const svalue *recorded = get_dynamic_extents (reg)) | |
2792 | return recorded; | |
2793 | ||
2794 | return m_mgr->get_or_create_unknown_svalue (sizetype); | |
2795 | } | |
2796 | ||
0a9c0d4a TL |
2797 | /* Return the string size, including the 0-terminator, if SVAL is a |
2798 | constant_svalue holding a string. Otherwise, return an unknown_svalue. */ | |
2799 | ||
2800 | const svalue * | |
2801 | region_model::get_string_size (const svalue *sval) const | |
2802 | { | |
2803 | tree cst = sval->maybe_get_constant (); | |
2804 | if (!cst || TREE_CODE (cst) != STRING_CST) | |
2805 | return m_mgr->get_or_create_unknown_svalue (size_type_node); | |
2806 | ||
2807 | tree out = build_int_cst (size_type_node, TREE_STRING_LENGTH (cst)); | |
2808 | return m_mgr->get_or_create_constant_svalue (out); | |
2809 | } | |
2810 | ||
2811 | /* Return the string size, including the 0-terminator, if REG is a | |
2812 | string_region. Otherwise, return an unknown_svalue. */ | |
2813 | ||
2814 | const svalue * | |
2815 | region_model::get_string_size (const region *reg) const | |
2816 | { | |
2817 | const string_region *str_reg = dyn_cast <const string_region *> (reg); | |
2818 | if (!str_reg) | |
2819 | return m_mgr->get_or_create_unknown_svalue (size_type_node); | |
2820 | ||
2821 | tree cst = str_reg->get_string_cst (); | |
2822 | tree out = build_int_cst (size_type_node, TREE_STRING_LENGTH (cst)); | |
2823 | return m_mgr->get_or_create_constant_svalue (out); | |
2824 | } | |
2825 | ||
9faf8348 | 2826 | /* If CTXT is non-NULL, use it to warn about any problems accessing REG, |
9589a46d | 2827 | using DIR to determine if this access is a read or write. |
1eb90f46 | 2828 | Return TRUE if an OOB access was detected. |
0e466e97 DM |
2829 | If SVAL_HINT is non-NULL, use it as a hint in diagnostics |
2830 | about the value that would be written to REG. */ | |
9faf8348 | 2831 | |
9589a46d | 2832 | bool |
9faf8348 DM |
2833 | region_model::check_region_access (const region *reg, |
2834 | enum access_direction dir, | |
0e466e97 | 2835 | const svalue *sval_hint, |
9faf8348 DM |
2836 | region_model_context *ctxt) const |
2837 | { | |
2838 | /* Fail gracefully if CTXT is NULL. */ | |
2839 | if (!ctxt) | |
9589a46d | 2840 | return false; |
9faf8348 | 2841 | |
1eb90f46 | 2842 | bool oob_access_detected = false; |
b9365b93 | 2843 | check_region_for_taint (reg, dir, ctxt); |
0e466e97 | 2844 | if (!check_region_bounds (reg, dir, sval_hint, ctxt)) |
1eb90f46 | 2845 | oob_access_detected = true; |
b9365b93 | 2846 | |
9faf8348 DM |
2847 | switch (dir) |
2848 | { | |
2849 | default: | |
2850 | gcc_unreachable (); | |
2851 | case DIR_READ: | |
2852 | /* Currently a no-op. */ | |
2853 | break; | |
2854 | case DIR_WRITE: | |
2855 | check_for_writable_region (reg, ctxt); | |
2856 | break; | |
2857 | } | |
1eb90f46 | 2858 | return oob_access_detected; |
9faf8348 DM |
2859 | } |
2860 | ||
2861 | /* If CTXT is non-NULL, use it to warn about any problems writing to REG. */ | |
2862 | ||
2863 | void | |
2864 | region_model::check_region_for_write (const region *dest_reg, | |
0e466e97 | 2865 | const svalue *sval_hint, |
9faf8348 DM |
2866 | region_model_context *ctxt) const |
2867 | { | |
0e466e97 | 2868 | check_region_access (dest_reg, DIR_WRITE, sval_hint, ctxt); |
9faf8348 DM |
2869 | } |
2870 | ||
9589a46d | 2871 | /* If CTXT is non-NULL, use it to warn about any problems reading from REG. |
1eb90f46 | 2872 | Returns TRUE if an OOB read was detected. */ |
9faf8348 | 2873 | |
9589a46d | 2874 | bool |
9faf8348 DM |
2875 | region_model::check_region_for_read (const region *src_reg, |
2876 | region_model_context *ctxt) const | |
2877 | { | |
0e466e97 | 2878 | return check_region_access (src_reg, DIR_READ, NULL, ctxt); |
9faf8348 DM |
2879 | } |
2880 | ||
e6c3bb37 TL |
2881 | /* Concrete subclass for casts of pointers that lead to trailing bytes. */ |
2882 | ||
2883 | class dubious_allocation_size | |
2884 | : public pending_diagnostic_subclass<dubious_allocation_size> | |
2885 | { | |
2886 | public: | |
021077b9 DM |
2887 | dubious_allocation_size (const region *lhs, const region *rhs, |
2888 | const gimple *stmt) | |
2889 | : m_lhs (lhs), m_rhs (rhs), m_expr (NULL_TREE), m_stmt (stmt), | |
f5758fe5 | 2890 | m_has_allocation_event (false) |
e6c3bb37 TL |
2891 | {} |
2892 | ||
2893 | dubious_allocation_size (const region *lhs, const region *rhs, | |
021077b9 DM |
2894 | tree expr, const gimple *stmt) |
2895 | : m_lhs (lhs), m_rhs (rhs), m_expr (expr), m_stmt (stmt), | |
f5758fe5 | 2896 | m_has_allocation_event (false) |
e6c3bb37 TL |
2897 | {} |
2898 | ||
2899 | const char *get_kind () const final override | |
2900 | { | |
2901 | return "dubious_allocation_size"; | |
2902 | } | |
2903 | ||
2904 | bool operator== (const dubious_allocation_size &other) const | |
2905 | { | |
021077b9 DM |
2906 | return (m_stmt == other.m_stmt |
2907 | && pending_diagnostic::same_tree_p (m_expr, other.m_expr)); | |
e6c3bb37 TL |
2908 | } |
2909 | ||
2910 | int get_controlling_option () const final override | |
2911 | { | |
2912 | return OPT_Wanalyzer_allocation_size; | |
2913 | } | |
2914 | ||
0e466e97 | 2915 | bool emit (rich_location *rich_loc, logger *) final override |
e6c3bb37 TL |
2916 | { |
2917 | diagnostic_metadata m; | |
2918 | m.add_cwe (131); | |
2919 | ||
2920 | return warning_meta (rich_loc, m, get_controlling_option (), | |
c83e9731 TL |
2921 | "allocated buffer size is not a multiple" |
2922 | " of the pointee's size"); | |
e6c3bb37 TL |
2923 | } |
2924 | ||
e6c3bb37 TL |
2925 | label_text describe_final_event (const evdesc::final_event &ev) final |
2926 | override | |
2927 | { | |
2928 | tree pointee_type = TREE_TYPE (m_lhs->get_type ()); | |
f5758fe5 | 2929 | if (m_has_allocation_event) |
e6c3bb37 TL |
2930 | return ev.formatted_print ("assigned to %qT here;" |
2931 | " %<sizeof (%T)%> is %qE", | |
2932 | m_lhs->get_type (), pointee_type, | |
2933 | size_in_bytes (pointee_type)); | |
f5758fe5 DM |
2934 | /* Fallback: Typically, we should always see an allocation_event |
2935 | before. */ | |
e6c3bb37 TL |
2936 | if (m_expr) |
2937 | { | |
2938 | if (TREE_CODE (m_expr) == INTEGER_CST) | |
2939 | return ev.formatted_print ("allocated %E bytes and assigned to" | |
2940 | " %qT here; %<sizeof (%T)%> is %qE", | |
2941 | m_expr, m_lhs->get_type (), pointee_type, | |
2942 | size_in_bytes (pointee_type)); | |
2943 | else | |
2944 | return ev.formatted_print ("allocated %qE bytes and assigned to" | |
2945 | " %qT here; %<sizeof (%T)%> is %qE", | |
2946 | m_expr, m_lhs->get_type (), pointee_type, | |
2947 | size_in_bytes (pointee_type)); | |
2948 | } | |
2949 | ||
2950 | return ev.formatted_print ("allocated and assigned to %qT here;" | |
2951 | " %<sizeof (%T)%> is %qE", | |
2952 | m_lhs->get_type (), pointee_type, | |
2953 | size_in_bytes (pointee_type)); | |
2954 | } | |
2955 | ||
f5758fe5 DM |
2956 | void |
2957 | add_region_creation_events (const region *, | |
2958 | tree capacity, | |
e24fe128 | 2959 | const event_loc_info &loc_info, |
f5758fe5 DM |
2960 | checker_path &emission_path) final override |
2961 | { | |
2962 | emission_path.add_event | |
e24fe128 | 2963 | (make_unique<region_creation_event_allocation_size> (capacity, loc_info)); |
f5758fe5 DM |
2964 | |
2965 | m_has_allocation_event = true; | |
2966 | } | |
2967 | ||
e6c3bb37 TL |
2968 | void mark_interesting_stuff (interesting_t *interest) final override |
2969 | { | |
2970 | interest->add_region_creation (m_rhs); | |
2971 | } | |
2972 | ||
2973 | private: | |
2974 | const region *m_lhs; | |
2975 | const region *m_rhs; | |
2976 | const tree m_expr; | |
021077b9 | 2977 | const gimple *m_stmt; |
f5758fe5 | 2978 | bool m_has_allocation_event; |
e6c3bb37 TL |
2979 | }; |
2980 | ||
2981 | /* Return true on dubious allocation sizes for constant sizes. */ | |
2982 | ||
2983 | static bool | |
2984 | capacity_compatible_with_type (tree cst, tree pointee_size_tree, | |
2985 | bool is_struct) | |
2986 | { | |
2987 | gcc_assert (TREE_CODE (cst) == INTEGER_CST); | |
2988 | gcc_assert (TREE_CODE (pointee_size_tree) == INTEGER_CST); | |
2989 | ||
2990 | unsigned HOST_WIDE_INT pointee_size = TREE_INT_CST_LOW (pointee_size_tree); | |
2991 | unsigned HOST_WIDE_INT alloc_size = TREE_INT_CST_LOW (cst); | |
2992 | ||
2993 | if (is_struct) | |
b4cc945c | 2994 | return alloc_size == 0 || alloc_size >= pointee_size; |
e6c3bb37 TL |
2995 | return alloc_size % pointee_size == 0; |
2996 | } | |
2997 | ||
2998 | static bool | |
2999 | capacity_compatible_with_type (tree cst, tree pointee_size_tree) | |
3000 | { | |
3001 | return capacity_compatible_with_type (cst, pointee_size_tree, false); | |
3002 | } | |
3003 | ||
3004 | /* Checks whether SVAL could be a multiple of SIZE_CST. | |
3005 | ||
3006 | It works by visiting all svalues inside SVAL until it reaches | |
3007 | atomic nodes. From those, it goes back up again and adds each | |
1d57a223 | 3008 | node that is not a multiple of SIZE_CST to the RESULT_SET. */ |
e6c3bb37 TL |
3009 | |
3010 | class size_visitor : public visitor | |
3011 | { | |
3012 | public: | |
c83e9731 TL |
3013 | size_visitor (tree size_cst, const svalue *root_sval, constraint_manager *cm) |
3014 | : m_size_cst (size_cst), m_root_sval (root_sval), m_cm (cm) | |
e6c3bb37 | 3015 | { |
c83e9731 | 3016 | m_root_sval->accept (this); |
e6c3bb37 TL |
3017 | } |
3018 | ||
1d57a223 | 3019 | bool is_dubious_capacity () |
e6c3bb37 | 3020 | { |
c83e9731 | 3021 | return result_set.contains (m_root_sval); |
e6c3bb37 TL |
3022 | } |
3023 | ||
3024 | void visit_constant_svalue (const constant_svalue *sval) final override | |
3025 | { | |
c83e9731 | 3026 | check_constant (sval->get_constant (), sval); |
e6c3bb37 TL |
3027 | } |
3028 | ||
bdd385b2 | 3029 | void visit_unaryop_svalue (const unaryop_svalue *sval) final override |
e6c3bb37 | 3030 | { |
1d57a223 TL |
3031 | if (CONVERT_EXPR_CODE_P (sval->get_op ()) |
3032 | && result_set.contains (sval->get_arg ())) | |
e6c3bb37 TL |
3033 | result_set.add (sval); |
3034 | } | |
3035 | ||
3036 | void visit_binop_svalue (const binop_svalue *sval) final override | |
3037 | { | |
3038 | const svalue *arg0 = sval->get_arg0 (); | |
3039 | const svalue *arg1 = sval->get_arg1 (); | |
3040 | ||
1d57a223 | 3041 | switch (sval->get_op ()) |
e6c3bb37 | 3042 | { |
1d57a223 TL |
3043 | case MULT_EXPR: |
3044 | if (result_set.contains (arg0) && result_set.contains (arg1)) | |
3045 | result_set.add (sval); | |
3046 | break; | |
3047 | case PLUS_EXPR: | |
3048 | case MINUS_EXPR: | |
3049 | if (result_set.contains (arg0) || result_set.contains (arg1)) | |
3050 | result_set.add (sval); | |
3051 | break; | |
3052 | default: | |
3053 | break; | |
e6c3bb37 TL |
3054 | } |
3055 | } | |
3056 | ||
e6c3bb37 TL |
3057 | void visit_unmergeable_svalue (const unmergeable_svalue *sval) final override |
3058 | { | |
e6c3bb37 TL |
3059 | if (result_set.contains (sval->get_arg ())) |
3060 | result_set.add (sval); | |
3061 | } | |
3062 | ||
3063 | void visit_widening_svalue (const widening_svalue *sval) final override | |
3064 | { | |
3065 | const svalue *base = sval->get_base_svalue (); | |
3066 | const svalue *iter = sval->get_iter_svalue (); | |
3067 | ||
1d57a223 | 3068 | if (result_set.contains (base) || result_set.contains (iter)) |
e6c3bb37 TL |
3069 | result_set.add (sval); |
3070 | } | |
3071 | ||
1d57a223 | 3072 | void visit_initial_svalue (const initial_svalue *sval) final override |
e6c3bb37 | 3073 | { |
1d57a223 | 3074 | equiv_class_id id = equiv_class_id::null (); |
e6c3bb37 TL |
3075 | if (m_cm->get_equiv_class_by_svalue (sval, &id)) |
3076 | { | |
c83e9731 TL |
3077 | if (tree cst = id.get_obj (*m_cm).get_any_constant ()) |
3078 | check_constant (cst, sval); | |
1d57a223 TL |
3079 | } |
3080 | else if (!m_cm->sval_constrained_p (sval)) | |
3081 | { | |
3082 | result_set.add (sval); | |
e6c3bb37 TL |
3083 | } |
3084 | } | |
3085 | ||
1d57a223 | 3086 | void visit_conjured_svalue (const conjured_svalue *sval) final override |
e6c3bb37 | 3087 | { |
1d57a223 TL |
3088 | equiv_class_id id = equiv_class_id::null (); |
3089 | if (m_cm->get_equiv_class_by_svalue (sval, &id)) | |
3090 | if (tree cst = id.get_obj (*m_cm).get_any_constant ()) | |
3091 | check_constant (cst, sval); | |
e6c3bb37 TL |
3092 | } |
3093 | ||
3094 | private: | |
c83e9731 TL |
3095 | void check_constant (tree cst, const svalue *sval) |
3096 | { | |
3097 | switch (TREE_CODE (cst)) | |
3098 | { | |
3099 | default: | |
3100 | /* Assume all unhandled operands are compatible. */ | |
c83e9731 TL |
3101 | break; |
3102 | case INTEGER_CST: | |
1d57a223 | 3103 | if (!capacity_compatible_with_type (cst, m_size_cst)) |
c83e9731 TL |
3104 | result_set.add (sval); |
3105 | break; | |
3106 | } | |
3107 | } | |
3108 | ||
e6c3bb37 | 3109 | tree m_size_cst; |
c83e9731 | 3110 | const svalue *m_root_sval; |
e6c3bb37 TL |
3111 | constraint_manager *m_cm; |
3112 | svalue_set result_set; /* Used as a mapping of svalue*->bool. */ | |
3113 | }; | |
3114 | ||
3115 | /* Return true if a struct or union either uses the inheritance pattern, | |
3116 | where the first field is a base struct, or the flexible array member | |
3117 | pattern, where the last field is an array without a specified size. */ | |
3118 | ||
3119 | static bool | |
3120 | struct_or_union_with_inheritance_p (tree struc) | |
3121 | { | |
3122 | tree iter = TYPE_FIELDS (struc); | |
3123 | if (iter == NULL_TREE) | |
3124 | return false; | |
3125 | if (RECORD_OR_UNION_TYPE_P (TREE_TYPE (iter))) | |
3126 | return true; | |
3127 | ||
3128 | tree last_field; | |
3129 | while (iter != NULL_TREE) | |
3130 | { | |
3131 | last_field = iter; | |
3132 | iter = DECL_CHAIN (iter); | |
3133 | } | |
3134 | ||
3135 | if (last_field != NULL_TREE | |
3136 | && TREE_CODE (TREE_TYPE (last_field)) == ARRAY_TYPE) | |
3137 | return true; | |
3138 | ||
3139 | return false; | |
3140 | } | |
3141 | ||
3142 | /* Return true if the lhs and rhs of an assignment have different types. */ | |
3143 | ||
3144 | static bool | |
3145 | is_any_cast_p (const gimple *stmt) | |
3146 | { | |
c83e9731 | 3147 | if (const gassign *assign = dyn_cast <const gassign *> (stmt)) |
e6c3bb37 TL |
3148 | return gimple_assign_cast_p (assign) |
3149 | || !pending_diagnostic::same_tree_p ( | |
3150 | TREE_TYPE (gimple_assign_lhs (assign)), | |
3151 | TREE_TYPE (gimple_assign_rhs1 (assign))); | |
c83e9731 | 3152 | else if (const gcall *call = dyn_cast <const gcall *> (stmt)) |
e6c3bb37 TL |
3153 | { |
3154 | tree lhs = gimple_call_lhs (call); | |
3155 | return lhs != NULL_TREE && !pending_diagnostic::same_tree_p ( | |
3156 | TREE_TYPE (gimple_call_lhs (call)), | |
3157 | gimple_call_return_type (call)); | |
3158 | } | |
3159 | ||
3160 | return false; | |
3161 | } | |
3162 | ||
3163 | /* On pointer assignments, check whether the buffer size of | |
3164 | RHS_SVAL is compatible with the type of the LHS_REG. | |
3165 | Use a non-null CTXT to report allocation size warnings. */ | |
3166 | ||
3167 | void | |
3168 | region_model::check_region_size (const region *lhs_reg, const svalue *rhs_sval, | |
3169 | region_model_context *ctxt) const | |
3170 | { | |
3171 | if (!ctxt || ctxt->get_stmt () == NULL) | |
3172 | return; | |
3173 | /* Only report warnings on assignments that actually change the type. */ | |
3174 | if (!is_any_cast_p (ctxt->get_stmt ())) | |
3175 | return; | |
3176 | ||
e6c3bb37 TL |
3177 | tree pointer_type = lhs_reg->get_type (); |
3178 | if (pointer_type == NULL_TREE || !POINTER_TYPE_P (pointer_type)) | |
3179 | return; | |
3180 | ||
3181 | tree pointee_type = TREE_TYPE (pointer_type); | |
3182 | /* Make sure that the type on the left-hand size actually has a size. */ | |
3183 | if (pointee_type == NULL_TREE || VOID_TYPE_P (pointee_type) | |
3184 | || TYPE_SIZE_UNIT (pointee_type) == NULL_TREE) | |
3185 | return; | |
3186 | ||
3187 | /* Bail out early on pointers to structs where we can | |
3188 | not deduce whether the buffer size is compatible. */ | |
3189 | bool is_struct = RECORD_OR_UNION_TYPE_P (pointee_type); | |
3190 | if (is_struct && struct_or_union_with_inheritance_p (pointee_type)) | |
3191 | return; | |
3192 | ||
3193 | tree pointee_size_tree = size_in_bytes (pointee_type); | |
3194 | /* We give up if the type size is not known at compile-time or the | |
3195 | type size is always compatible regardless of the buffer size. */ | |
3196 | if (TREE_CODE (pointee_size_tree) != INTEGER_CST | |
3197 | || integer_zerop (pointee_size_tree) | |
3198 | || integer_onep (pointee_size_tree)) | |
3199 | return; | |
3200 | ||
021077b9 | 3201 | const region *rhs_reg = deref_rvalue (rhs_sval, NULL_TREE, ctxt, false); |
e6c3bb37 TL |
3202 | const svalue *capacity = get_capacity (rhs_reg); |
3203 | switch (capacity->get_kind ()) | |
3204 | { | |
3205 | case svalue_kind::SK_CONSTANT: | |
3206 | { | |
3207 | const constant_svalue *cst_cap_sval | |
c83e9731 | 3208 | = as_a <const constant_svalue *> (capacity); |
e6c3bb37 | 3209 | tree cst_cap = cst_cap_sval->get_constant (); |
c83e9731 TL |
3210 | if (TREE_CODE (cst_cap) == INTEGER_CST |
3211 | && !capacity_compatible_with_type (cst_cap, pointee_size_tree, | |
3212 | is_struct)) | |
6341f14e | 3213 | ctxt->warn (make_unique <dubious_allocation_size> (lhs_reg, rhs_reg, |
021077b9 DM |
3214 | cst_cap, |
3215 | ctxt->get_stmt ())); | |
e6c3bb37 TL |
3216 | } |
3217 | break; | |
3218 | default: | |
3219 | { | |
3220 | if (!is_struct) | |
3221 | { | |
3222 | size_visitor v (pointee_size_tree, capacity, m_constraints); | |
1d57a223 | 3223 | if (v.is_dubious_capacity ()) |
e6c3bb37 TL |
3224 | { |
3225 | tree expr = get_representative_tree (capacity); | |
6341f14e DM |
3226 | ctxt->warn (make_unique <dubious_allocation_size> (lhs_reg, |
3227 | rhs_reg, | |
021077b9 DM |
3228 | expr, |
3229 | ctxt->get_stmt ())); | |
e6c3bb37 TL |
3230 | } |
3231 | } | |
3232 | break; | |
3233 | } | |
3234 | } | |
3235 | } | |
3236 | ||
808f4dfe | 3237 | /* Set the value of the region given by LHS_REG to the value given |
9faf8348 DM |
3238 | by RHS_SVAL. |
3239 | Use CTXT to report any warnings associated with writing to LHS_REG. */ | |
757bf1df | 3240 | |
808f4dfe DM |
3241 | void |
3242 | region_model::set_value (const region *lhs_reg, const svalue *rhs_sval, | |
3175d40f | 3243 | region_model_context *ctxt) |
757bf1df | 3244 | { |
808f4dfe DM |
3245 | gcc_assert (lhs_reg); |
3246 | gcc_assert (rhs_sval); | |
3247 | ||
dfe2ef7f DM |
3248 | /* Setting the value of an empty region is a no-op. */ |
3249 | if (lhs_reg->empty_p ()) | |
3250 | return; | |
3251 | ||
e6c3bb37 TL |
3252 | check_region_size (lhs_reg, rhs_sval, ctxt); |
3253 | ||
0e466e97 | 3254 | check_region_for_write (lhs_reg, rhs_sval, ctxt); |
3175d40f | 3255 | |
808f4dfe | 3256 | m_store.set_value (m_mgr->get_store_manager(), lhs_reg, rhs_sval, |
e61ffa20 | 3257 | ctxt ? ctxt->get_uncertainty () : NULL); |
757bf1df DM |
3258 | } |
3259 | ||
808f4dfe | 3260 | /* Set the value of the region given by LHS to the value given by RHS. */ |
757bf1df DM |
3261 | |
3262 | void | |
808f4dfe | 3263 | region_model::set_value (tree lhs, tree rhs, region_model_context *ctxt) |
757bf1df | 3264 | { |
808f4dfe DM |
3265 | const region *lhs_reg = get_lvalue (lhs, ctxt); |
3266 | const svalue *rhs_sval = get_rvalue (rhs, ctxt); | |
3267 | gcc_assert (lhs_reg); | |
3268 | gcc_assert (rhs_sval); | |
3269 | set_value (lhs_reg, rhs_sval, ctxt); | |
757bf1df DM |
3270 | } |
3271 | ||
325f9e88 DM |
3272 | /* Issue a note specifying that a particular function parameter is expected |
3273 | to be a valid null-terminated string. */ | |
3274 | ||
3275 | static void | |
3276 | inform_about_expected_null_terminated_string_arg (const call_arg_details &ad) | |
3277 | { | |
3278 | // TODO: ideally we'd underline the param here | |
3279 | inform (DECL_SOURCE_LOCATION (ad.m_called_fndecl), | |
3280 | "argument %d of %qD must be a pointer to a null-terminated string", | |
3281 | ad.m_arg_idx + 1, ad.m_called_fndecl); | |
3282 | } | |
3283 | ||
fe97f09a | 3284 | /* A binding of a specific svalue at a concrete byte range. */ |
325f9e88 | 3285 | |
fe97f09a | 3286 | struct fragment |
325f9e88 | 3287 | { |
fe97f09a DM |
3288 | fragment () |
3289 | : m_byte_range (0, 0), m_sval (nullptr) | |
325f9e88 | 3290 | { |
325f9e88 DM |
3291 | } |
3292 | ||
fe97f09a DM |
3293 | fragment (const byte_range &bytes, const svalue *sval) |
3294 | : m_byte_range (bytes), m_sval (sval) | |
325f9e88 | 3295 | { |
325f9e88 DM |
3296 | } |
3297 | ||
fe97f09a | 3298 | static int cmp_ptrs (const void *p1, const void *p2) |
325f9e88 | 3299 | { |
fe97f09a DM |
3300 | const fragment *f1 = (const fragment *)p1; |
3301 | const fragment *f2 = (const fragment *)p2; | |
3302 | return byte_range::cmp (f1->m_byte_range, f2->m_byte_range); | |
325f9e88 DM |
3303 | } |
3304 | ||
fe97f09a DM |
3305 | /* Determine if there is a zero terminator somewhere in the |
3306 | bytes of this fragment, starting at START_READ_OFFSET (which | |
3307 | is absolute to the start of the cluster as a whole), and stopping | |
3308 | at the end of this fragment. | |
3309 | ||
3310 | Return a tristate: | |
3311 | - true if there definitely is a zero byte, writing to *OUT_BYTES_READ | |
3312 | the number of bytes from that would be read, including the zero byte. | |
3313 | - false if there definitely isn't a zero byte | |
3314 | - unknown if we don't know. */ | |
3315 | tristate has_null_terminator (byte_offset_t start_read_offset, | |
3316 | byte_offset_t *out_bytes_read) const | |
325f9e88 | 3317 | { |
fe97f09a DM |
3318 | byte_offset_t rel_start_read_offset |
3319 | = start_read_offset - m_byte_range.get_start_byte_offset (); | |
3320 | gcc_assert (rel_start_read_offset >= 0); | |
3321 | byte_offset_t available_bytes | |
3322 | = (m_byte_range.get_next_byte_offset () - start_read_offset); | |
3323 | gcc_assert (available_bytes >= 0); | |
3324 | ||
3325 | if (rel_start_read_offset > INT_MAX) | |
3326 | return tristate::TS_UNKNOWN; | |
3327 | HOST_WIDE_INT rel_start_read_offset_hwi = rel_start_read_offset.slow (); | |
3328 | ||
3329 | if (available_bytes > INT_MAX) | |
3330 | return tristate::TS_UNKNOWN; | |
3331 | HOST_WIDE_INT available_bytes_hwi = available_bytes.slow (); | |
3332 | ||
3333 | switch (m_sval->get_kind ()) | |
3334 | { | |
3335 | case SK_CONSTANT: | |
3336 | { | |
3337 | tree cst | |
3338 | = as_a <const constant_svalue *> (m_sval)->get_constant (); | |
3339 | switch (TREE_CODE (cst)) | |
3340 | { | |
3341 | case STRING_CST: | |
3342 | { | |
3343 | /* Look for the first 0 byte within STRING_CST | |
3344 | from START_READ_OFFSET onwards. */ | |
3345 | const HOST_WIDE_INT num_bytes_to_search | |
3346 | = std::min<HOST_WIDE_INT> ((TREE_STRING_LENGTH (cst) | |
3347 | - rel_start_read_offset_hwi), | |
3348 | available_bytes_hwi); | |
3349 | const char *start = (TREE_STRING_POINTER (cst) | |
3350 | + rel_start_read_offset_hwi); | |
3351 | if (num_bytes_to_search >= 0) | |
3352 | if (const void *p = memchr (start, 0, | |
3353 | num_bytes_to_search)) | |
3354 | { | |
3355 | *out_bytes_read = (const char *)p - start + 1; | |
3356 | return tristate (true); | |
3357 | } | |
3358 | ||
3359 | *out_bytes_read = available_bytes; | |
3360 | return tristate (false); | |
3361 | } | |
3362 | break; | |
3363 | case INTEGER_CST: | |
3364 | if (rel_start_read_offset_hwi == 0 | |
3365 | && integer_onep (TYPE_SIZE_UNIT (TREE_TYPE (cst)))) | |
3366 | { | |
3367 | /* Model accesses to the initial byte of a 1-byte | |
3368 | INTEGER_CST. */ | |
3369 | if (zerop (cst)) | |
3370 | { | |
3371 | *out_bytes_read = 1; | |
3372 | return tristate (true); | |
3373 | } | |
3374 | else | |
3375 | { | |
3376 | *out_bytes_read = available_bytes; | |
3377 | return tristate (false); | |
3378 | } | |
3379 | } | |
3380 | /* Treat any other access to an INTEGER_CST as unknown. */ | |
3381 | return tristate::TS_UNKNOWN; | |
3382 | ||
3383 | default: | |
3384 | gcc_unreachable (); | |
3385 | break; | |
3386 | } | |
3387 | } | |
3388 | break; | |
3389 | default: | |
3390 | // TODO: it may be possible to handle other cases here. | |
3391 | return tristate::TS_UNKNOWN; | |
3392 | } | |
325f9e88 DM |
3393 | } |
3394 | ||
fe97f09a DM |
3395 | byte_range m_byte_range; |
3396 | const svalue *m_sval; | |
3397 | }; | |
3398 | ||
3399 | /* A frozen copy of a single base region's binding_cluster within a store, | |
3400 | optimized for traversal of the concrete parts in byte order. | |
3401 | This only captures concrete bindings, and is an implementation detail | |
3402 | of region_model::scan_for_null_terminator. */ | |
3403 | ||
3404 | class iterable_cluster | |
3405 | { | |
3406 | public: | |
3407 | iterable_cluster (const binding_cluster *cluster) | |
325f9e88 | 3408 | { |
fe97f09a DM |
3409 | if (!cluster) |
3410 | return; | |
3411 | for (auto iter : *cluster) | |
3412 | { | |
3413 | const binding_key *key = iter.first; | |
3414 | const svalue *sval = iter.second; | |
3415 | ||
3416 | if (const concrete_binding *concrete_key | |
3417 | = key->dyn_cast_concrete_binding ()) | |
3418 | { | |
3419 | byte_range fragment_bytes (0, 0); | |
3420 | if (concrete_key->get_byte_range (&fragment_bytes)) | |
3421 | m_fragments.safe_push (fragment (fragment_bytes, sval)); | |
3422 | } | |
3423 | } | |
3424 | m_fragments.qsort (fragment::cmp_ptrs); | |
325f9e88 DM |
3425 | } |
3426 | ||
fe97f09a DM |
3427 | bool |
3428 | get_fragment_for_byte (byte_offset_t byte, fragment *out_frag) const | |
325f9e88 | 3429 | { |
fe97f09a DM |
3430 | /* TODO: binary search rather than linear. */ |
3431 | unsigned iter_idx; | |
3432 | for (iter_idx = 0; iter_idx < m_fragments.length (); iter_idx++) | |
3433 | { | |
3434 | if (m_fragments[iter_idx].m_byte_range.contains_p (byte)) | |
3435 | { | |
3436 | *out_frag = m_fragments[iter_idx]; | |
3437 | return true; | |
3438 | } | |
3439 | } | |
3440 | return false; | |
325f9e88 DM |
3441 | } |
3442 | ||
3443 | private: | |
fe97f09a | 3444 | auto_vec<fragment> m_fragments; |
325f9e88 DM |
3445 | }; |
3446 | ||
fe97f09a DM |
3447 | /* Simulate reading the bytes at BYTES from BASE_REG. |
3448 | Complain to CTXT about any issues with the read e.g. out-of-bounds. */ | |
3449 | ||
3450 | const svalue * | |
3451 | region_model::get_store_bytes (const region *base_reg, | |
3452 | const byte_range &bytes, | |
3453 | region_model_context *ctxt) const | |
3454 | { | |
3455 | const svalue *index_sval | |
3456 | = m_mgr->get_or_create_int_cst (size_type_node, | |
3457 | bytes.get_start_byte_offset ()); | |
3458 | const region *offset_reg = m_mgr->get_offset_region (base_reg, | |
3459 | NULL_TREE, | |
3460 | index_sval); | |
3461 | const svalue *byte_size_sval | |
3462 | = m_mgr->get_or_create_int_cst (size_type_node, bytes.m_size_in_bytes); | |
3463 | const region *read_reg = m_mgr->get_sized_region (offset_reg, | |
3464 | NULL_TREE, | |
3465 | byte_size_sval); | |
3466 | ||
3467 | /* Simulate reading those bytes from the store. */ | |
3468 | const svalue *sval = get_store_value (read_reg, ctxt); | |
3469 | return sval; | |
3470 | } | |
3471 | ||
3472 | static tree | |
3473 | get_tree_for_byte_offset (tree ptr_expr, byte_offset_t byte_offset) | |
3474 | { | |
3475 | gcc_assert (ptr_expr); | |
3476 | return fold_build2 (MEM_REF, | |
3477 | char_type_node, | |
3478 | ptr_expr, wide_int_to_tree (size_type_node, byte_offset)); | |
3479 | } | |
3480 | ||
3481 | /* Simulate a series of reads of REG until we find a 0 byte | |
3482 | (equivalent to calling strlen). | |
3483 | ||
3484 | Complain to CTXT and return NULL if: | |
3485 | - the buffer pointed to isn't null-terminated | |
3486 | - the buffer pointed to has any uninitalized bytes before any 0-terminator | |
3487 | - any of the reads aren't within the bounds of the underlying base region | |
3488 | ||
3489 | Otherwise, return a svalue for the number of bytes read (strlen + 1), | |
3490 | and, if OUT_SVAL is non-NULL, write to *OUT_SVAL with an svalue | |
3491 | representing the content of REG up to and including the terminator. | |
3492 | ||
3493 | Algorithm | |
3494 | ========= | |
3495 | ||
3496 | Get offset for first byte to read. | |
3497 | Find the binding (if any) that contains it. | |
3498 | Find the size in bits of that binding. | |
3499 | Round to the nearest byte (which way???) | |
3500 | Or maybe give up if we have a partial binding there. | |
3501 | Get the svalue from the binding. | |
3502 | Determine the strlen (if any) of that svalue. | |
3503 | Does it have a 0-terminator within it? | |
3504 | If so, we have a partial read up to and including that terminator | |
3505 | Read those bytes from the store; add to the result in the correct place. | |
3506 | Finish | |
3507 | If not, we have a full read of that svalue | |
3508 | Read those bytes from the store; add to the result in the correct place. | |
3509 | Update read/write offsets | |
3510 | Continue | |
3511 | If unknown: | |
3512 | Result is unknown | |
3513 | Finish | |
3514 | */ | |
3515 | ||
3516 | const svalue * | |
3517 | region_model::scan_for_null_terminator (const region *reg, | |
3518 | tree expr, | |
3519 | const svalue **out_sval, | |
3520 | region_model_context *ctxt) const | |
3521 | { | |
3522 | store_manager *store_mgr = m_mgr->get_store_manager (); | |
3523 | ||
3524 | region_offset offset = reg->get_offset (m_mgr); | |
3525 | if (offset.symbolic_p ()) | |
3526 | { | |
3527 | if (out_sval) | |
3528 | *out_sval = m_mgr->get_or_create_unknown_svalue (NULL_TREE); | |
3529 | return m_mgr->get_or_create_unknown_svalue (size_type_node); | |
3530 | } | |
3531 | byte_offset_t src_byte_offset; | |
3532 | if (!offset.get_concrete_byte_offset (&src_byte_offset)) | |
3533 | { | |
3534 | if (out_sval) | |
3535 | *out_sval = m_mgr->get_or_create_unknown_svalue (NULL_TREE); | |
3536 | return m_mgr->get_or_create_unknown_svalue (size_type_node); | |
3537 | } | |
3538 | const byte_offset_t initial_src_byte_offset = src_byte_offset; | |
3539 | byte_offset_t dst_byte_offset = 0; | |
3540 | ||
3541 | const region *base_reg = reg->get_base_region (); | |
3542 | ||
3543 | if (const string_region *str_reg = base_reg->dyn_cast_string_region ()) | |
3544 | { | |
3545 | tree string_cst = str_reg->get_string_cst (); | |
3546 | if (const void *p = memchr (TREE_STRING_POINTER (string_cst), | |
3547 | 0, | |
3548 | TREE_STRING_LENGTH (string_cst))) | |
3549 | { | |
3550 | size_t num_bytes_read | |
3551 | = (const char *)p - TREE_STRING_POINTER (string_cst) + 1; | |
3552 | /* Simulate the read. */ | |
3553 | byte_range bytes_to_read (0, num_bytes_read); | |
3554 | const svalue *sval = get_store_bytes (reg, bytes_to_read, ctxt); | |
3555 | if (out_sval) | |
3556 | *out_sval = sval; | |
3557 | return m_mgr->get_or_create_int_cst (size_type_node, | |
3558 | num_bytes_read); | |
3559 | } | |
3560 | } | |
3561 | ||
3562 | const binding_cluster *cluster = m_store.get_cluster (base_reg); | |
3563 | iterable_cluster c (cluster); | |
3564 | binding_map result; | |
3565 | ||
3566 | while (1) | |
3567 | { | |
3568 | fragment f; | |
3569 | if (c.get_fragment_for_byte (src_byte_offset, &f)) | |
3570 | { | |
3571 | byte_offset_t fragment_bytes_read; | |
3572 | tristate is_terminated | |
3573 | = f.has_null_terminator (src_byte_offset, &fragment_bytes_read); | |
3574 | if (is_terminated.is_unknown ()) | |
3575 | { | |
3576 | if (out_sval) | |
3577 | *out_sval = m_mgr->get_or_create_unknown_svalue (NULL_TREE); | |
3578 | return m_mgr->get_or_create_unknown_svalue (size_type_node); | |
3579 | } | |
3580 | ||
3581 | /* Simulate reading those bytes from the store. */ | |
3582 | byte_range bytes_to_read (src_byte_offset, fragment_bytes_read); | |
3583 | const svalue *sval = get_store_bytes (base_reg, bytes_to_read, ctxt); | |
3584 | check_for_poison (sval, expr, nullptr, ctxt); | |
3585 | ||
3586 | if (out_sval) | |
3587 | { | |
3588 | byte_range bytes_to_write (dst_byte_offset, fragment_bytes_read); | |
3589 | const binding_key *key | |
3590 | = store_mgr->get_concrete_binding (bytes_to_write); | |
3591 | result.put (key, sval); | |
3592 | } | |
3593 | ||
3594 | src_byte_offset += fragment_bytes_read; | |
3595 | dst_byte_offset += fragment_bytes_read; | |
3596 | ||
3597 | if (is_terminated.is_true ()) | |
3598 | { | |
3599 | if (out_sval) | |
3600 | *out_sval = m_mgr->get_or_create_compound_svalue (NULL_TREE, | |
3601 | result); | |
3602 | return m_mgr->get_or_create_int_cst (size_type_node, | |
3603 | dst_byte_offset); | |
3604 | } | |
3605 | } | |
3606 | else | |
3607 | break; | |
3608 | } | |
3609 | ||
3610 | /* No binding for this base_region, or no binding at src_byte_offset | |
3611 | (or a symbolic binding). */ | |
3612 | ||
3613 | /* TODO: the various special-cases seen in | |
3614 | region_model::get_store_value. */ | |
3615 | ||
3616 | /* Simulate reading from this byte, then give up. */ | |
3617 | byte_range bytes_to_read (src_byte_offset, 1); | |
3618 | const svalue *sval = get_store_bytes (base_reg, bytes_to_read, ctxt); | |
3619 | tree byte_expr | |
3620 | = get_tree_for_byte_offset (expr, | |
3621 | src_byte_offset - initial_src_byte_offset); | |
3622 | check_for_poison (sval, byte_expr, nullptr, ctxt); | |
3623 | if (base_reg->can_have_initial_svalue_p ()) | |
3624 | { | |
3625 | if (out_sval) | |
3626 | *out_sval = m_mgr->get_or_create_unknown_svalue (NULL_TREE); | |
3627 | return m_mgr->get_or_create_unknown_svalue (size_type_node); | |
3628 | } | |
3629 | else | |
3630 | return nullptr; | |
3631 | } | |
3632 | ||
325f9e88 DM |
3633 | /* Check that argument ARG_IDX (0-based) to the call described by CD |
3634 | is a pointer to a valid null-terminated string. | |
3635 | ||
fe97f09a DM |
3636 | Simulate scanning through the buffer, reading until we find a 0 byte |
3637 | (equivalent to calling strlen). | |
325f9e88 | 3638 | |
fe97f09a DM |
3639 | Complain and return NULL if: |
3640 | - the buffer pointed to isn't null-terminated | |
3641 | - the buffer pointed to has any uninitalized bytes before any 0-terminator | |
3642 | - any of the reads aren't within the bounds of the underlying base region | |
325f9e88 | 3643 | |
fe97f09a DM |
3644 | Otherwise, return a svalue for the number of bytes read (strlen + 1), |
3645 | and, if OUT_SVAL is non-NULL, write to *OUT_SVAL with an svalue | |
3646 | representing the content of the buffer up to and including the terminator. | |
325f9e88 | 3647 | |
fe97f09a DM |
3648 | TODO: we should also complain if: |
3649 | - the pointer is NULL (or could be). */ | |
3650 | ||
3651 | const svalue * | |
325f9e88 | 3652 | region_model::check_for_null_terminated_string_arg (const call_details &cd, |
fe97f09a DM |
3653 | unsigned arg_idx, |
3654 | const svalue **out_sval) | |
325f9e88 | 3655 | { |
fe97f09a DM |
3656 | class null_terminator_check_event : public custom_event |
3657 | { | |
3658 | public: | |
3659 | null_terminator_check_event (const event_loc_info &loc_info, | |
3660 | const call_arg_details &arg_details) | |
3661 | : custom_event (loc_info), | |
3662 | m_arg_details (arg_details) | |
3663 | { | |
3664 | } | |
3665 | ||
3666 | label_text get_desc (bool can_colorize) const final override | |
3667 | { | |
3668 | if (m_arg_details.m_arg_expr) | |
3669 | return make_label_text (can_colorize, | |
3670 | "while looking for null terminator" | |
3671 | " for argument %i (%qE) of %qD...", | |
3672 | m_arg_details.m_arg_idx + 1, | |
3673 | m_arg_details.m_arg_expr, | |
3674 | m_arg_details.m_called_fndecl); | |
3675 | else | |
3676 | return make_label_text (can_colorize, | |
3677 | "while looking for null terminator" | |
3678 | " for argument %i of %qD...", | |
3679 | m_arg_details.m_arg_idx + 1, | |
3680 | m_arg_details.m_called_fndecl); | |
3681 | } | |
3682 | ||
3683 | private: | |
3684 | const call_arg_details m_arg_details; | |
3685 | }; | |
3686 | ||
3687 | class null_terminator_check_decl_note | |
3688 | : public pending_note_subclass<null_terminator_check_decl_note> | |
3689 | { | |
3690 | public: | |
3691 | null_terminator_check_decl_note (const call_arg_details &arg_details) | |
3692 | : m_arg_details (arg_details) | |
3693 | { | |
3694 | } | |
3695 | ||
3696 | const char *get_kind () const final override | |
3697 | { | |
3698 | return "null_terminator_check_decl_note"; | |
3699 | } | |
3700 | ||
3701 | void emit () const final override | |
3702 | { | |
3703 | inform_about_expected_null_terminated_string_arg (m_arg_details); | |
3704 | } | |
3705 | ||
3706 | bool operator== (const null_terminator_check_decl_note &other) const | |
3707 | { | |
3708 | return m_arg_details == other.m_arg_details; | |
3709 | } | |
3710 | ||
3711 | private: | |
3712 | const call_arg_details m_arg_details; | |
3713 | }; | |
3714 | ||
3715 | /* Subclass of decorated_region_model_context that | |
3716 | adds the above event and note to any saved diagnostics. */ | |
3717 | class annotating_ctxt : public annotating_context | |
3718 | { | |
3719 | public: | |
3720 | annotating_ctxt (const call_details &cd, | |
3721 | unsigned arg_idx) | |
3722 | : annotating_context (cd.get_ctxt ()), | |
3723 | m_cd (cd), | |
3724 | m_arg_idx (arg_idx) | |
3725 | { | |
3726 | } | |
3727 | void add_annotations () final override | |
3728 | { | |
3729 | call_arg_details arg_details (m_cd, m_arg_idx); | |
3730 | event_loc_info loc_info (m_cd.get_location (), | |
3731 | m_cd.get_model ()->get_current_function ()->decl, | |
3732 | m_cd.get_model ()->get_stack_depth ()); | |
3733 | ||
3734 | add_event (make_unique<null_terminator_check_event> (loc_info, | |
3735 | arg_details)); | |
3736 | add_note (make_unique <null_terminator_check_decl_note> (arg_details)); | |
3737 | } | |
3738 | private: | |
3739 | const call_details &m_cd; | |
3740 | unsigned m_arg_idx; | |
3741 | }; | |
3742 | ||
3743 | /* Use this ctxt below so that any diagnostics that get added | |
3744 | get annotated. */ | |
3745 | annotating_ctxt my_ctxt (cd, arg_idx); | |
325f9e88 DM |
3746 | |
3747 | const svalue *arg_sval = cd.get_arg_svalue (arg_idx); | |
3748 | const region *buf_reg | |
fe97f09a | 3749 | = deref_rvalue (arg_sval, cd.get_arg_tree (arg_idx), &my_ctxt); |
325f9e88 | 3750 | |
fe97f09a DM |
3751 | return scan_for_null_terminator (buf_reg, |
3752 | cd.get_arg_tree (arg_idx), | |
3753 | out_sval, | |
3754 | &my_ctxt); | |
325f9e88 DM |
3755 | } |
3756 | ||
808f4dfe | 3757 | /* Remove all bindings overlapping REG within the store. */ |
884d9141 DM |
3758 | |
3759 | void | |
808f4dfe DM |
3760 | region_model::clobber_region (const region *reg) |
3761 | { | |
3762 | m_store.clobber_region (m_mgr->get_store_manager(), reg); | |
3763 | } | |
3764 | ||
3765 | /* Remove any bindings for REG within the store. */ | |
3766 | ||
3767 | void | |
3768 | region_model::purge_region (const region *reg) | |
3769 | { | |
3770 | m_store.purge_region (m_mgr->get_store_manager(), reg); | |
3771 | } | |
3772 | ||
e61ffa20 DM |
3773 | /* Fill REG with SVAL. */ |
3774 | ||
3775 | void | |
3776 | region_model::fill_region (const region *reg, const svalue *sval) | |
3777 | { | |
3778 | m_store.fill_region (m_mgr->get_store_manager(), reg, sval); | |
3779 | } | |
3780 | ||
808f4dfe DM |
3781 | /* Zero-fill REG. */ |
3782 | ||
3783 | void | |
3784 | region_model::zero_fill_region (const region *reg) | |
3785 | { | |
3786 | m_store.zero_fill_region (m_mgr->get_store_manager(), reg); | |
3787 | } | |
3788 | ||
3789 | /* Mark REG as having unknown content. */ | |
3790 | ||
3791 | void | |
3a66c289 DM |
3792 | region_model::mark_region_as_unknown (const region *reg, |
3793 | uncertainty_t *uncertainty) | |
884d9141 | 3794 | { |
14f5e56a | 3795 | svalue_set maybe_live_values; |
3a66c289 | 3796 | m_store.mark_region_as_unknown (m_mgr->get_store_manager(), reg, |
14f5e56a DM |
3797 | uncertainty, &maybe_live_values); |
3798 | m_store.on_maybe_live_values (maybe_live_values); | |
884d9141 DM |
3799 | } |
3800 | ||
808f4dfe | 3801 | /* Determine what is known about the condition "LHS_SVAL OP RHS_SVAL" within |
757bf1df DM |
3802 | this model. */ |
3803 | ||
3804 | tristate | |
808f4dfe DM |
3805 | region_model::eval_condition (const svalue *lhs, |
3806 | enum tree_code op, | |
3807 | const svalue *rhs) const | |
757bf1df | 3808 | { |
757bf1df DM |
3809 | gcc_assert (lhs); |
3810 | gcc_assert (rhs); | |
3811 | ||
808f4dfe DM |
3812 | /* For now, make no attempt to capture constraints on floating-point |
3813 | values. */ | |
3814 | if ((lhs->get_type () && FLOAT_TYPE_P (lhs->get_type ())) | |
3815 | || (rhs->get_type () && FLOAT_TYPE_P (rhs->get_type ()))) | |
3816 | return tristate::unknown (); | |
3817 | ||
9bbcee45 DM |
3818 | /* See what we know based on the values. */ |
3819 | ||
808f4dfe DM |
3820 | /* Unwrap any unmergeable values. */ |
3821 | lhs = lhs->unwrap_any_unmergeable (); | |
3822 | rhs = rhs->unwrap_any_unmergeable (); | |
3823 | ||
3824 | if (lhs == rhs) | |
757bf1df | 3825 | { |
808f4dfe DM |
3826 | /* If we have the same svalue, then we have equality |
3827 | (apart from NaN-handling). | |
3828 | TODO: should this definitely be the case for poisoned values? */ | |
3829 | /* Poisoned and unknown values are "unknowable". */ | |
3830 | if (lhs->get_kind () == SK_POISONED | |
3831 | || lhs->get_kind () == SK_UNKNOWN) | |
3832 | return tristate::TS_UNKNOWN; | |
e978955d | 3833 | |
808f4dfe | 3834 | switch (op) |
757bf1df | 3835 | { |
808f4dfe DM |
3836 | case EQ_EXPR: |
3837 | case GE_EXPR: | |
3838 | case LE_EXPR: | |
3839 | return tristate::TS_TRUE; | |
07c86323 | 3840 | |
808f4dfe DM |
3841 | case NE_EXPR: |
3842 | case GT_EXPR: | |
3843 | case LT_EXPR: | |
3844 | return tristate::TS_FALSE; | |
3845 | ||
3846 | default: | |
3847 | /* For other ops, use the logic below. */ | |
3848 | break; | |
757bf1df | 3849 | } |
808f4dfe | 3850 | } |
757bf1df | 3851 | |
808f4dfe DM |
3852 | /* If we have a pair of region_svalues, compare them. */ |
3853 | if (const region_svalue *lhs_ptr = lhs->dyn_cast_region_svalue ()) | |
3854 | if (const region_svalue *rhs_ptr = rhs->dyn_cast_region_svalue ()) | |
3855 | { | |
3856 | tristate res = region_svalue::eval_condition (lhs_ptr, op, rhs_ptr); | |
3857 | if (res.is_known ()) | |
3858 | return res; | |
3859 | /* Otherwise, only known through constraints. */ | |
3860 | } | |
757bf1df | 3861 | |
808f4dfe | 3862 | if (const constant_svalue *cst_lhs = lhs->dyn_cast_constant_svalue ()) |
18faaeb3 DM |
3863 | { |
3864 | /* If we have a pair of constants, compare them. */ | |
3865 | if (const constant_svalue *cst_rhs = rhs->dyn_cast_constant_svalue ()) | |
3866 | return constant_svalue::eval_condition (cst_lhs, op, cst_rhs); | |
3867 | else | |
3868 | { | |
3869 | /* When we have one constant, put it on the RHS. */ | |
3870 | std::swap (lhs, rhs); | |
3871 | op = swap_tree_comparison (op); | |
3872 | } | |
3873 | } | |
3874 | gcc_assert (lhs->get_kind () != SK_CONSTANT); | |
757bf1df | 3875 | |
e82e0f14 DM |
3876 | /* Handle comparison against zero. */ |
3877 | if (const constant_svalue *cst_rhs = rhs->dyn_cast_constant_svalue ()) | |
3878 | if (zerop (cst_rhs->get_constant ())) | |
3879 | { | |
3880 | if (const region_svalue *ptr = lhs->dyn_cast_region_svalue ()) | |
3881 | { | |
3882 | /* A region_svalue is a non-NULL pointer, except in certain | |
3883 | special cases (see the comment for region::non_null_p). */ | |
3884 | const region *pointee = ptr->get_pointee (); | |
3885 | if (pointee->non_null_p ()) | |
3886 | { | |
3887 | switch (op) | |
3888 | { | |
3889 | default: | |
3890 | gcc_unreachable (); | |
3891 | ||
3892 | case EQ_EXPR: | |
3893 | case GE_EXPR: | |
3894 | case LE_EXPR: | |
3895 | return tristate::TS_FALSE; | |
3896 | ||
3897 | case NE_EXPR: | |
3898 | case GT_EXPR: | |
3899 | case LT_EXPR: | |
3900 | return tristate::TS_TRUE; | |
3901 | } | |
3902 | } | |
3903 | } | |
3904 | else if (const binop_svalue *binop = lhs->dyn_cast_binop_svalue ()) | |
3905 | { | |
3906 | /* Treat offsets from a non-NULL pointer as being non-NULL. This | |
3907 | isn't strictly true, in that eventually ptr++ will wrap | |
3908 | around and be NULL, but it won't occur in practise and thus | |
3909 | can be used to suppress effectively false positives that we | |
3910 | shouldn't warn for. */ | |
3911 | if (binop->get_op () == POINTER_PLUS_EXPR) | |
3912 | { | |
9bbcee45 | 3913 | tristate lhs_ts = eval_condition (binop->get_arg0 (), op, rhs); |
e82e0f14 DM |
3914 | if (lhs_ts.is_known ()) |
3915 | return lhs_ts; | |
3916 | } | |
3917 | } | |
0b737090 DM |
3918 | else if (const unaryop_svalue *unaryop |
3919 | = lhs->dyn_cast_unaryop_svalue ()) | |
3920 | { | |
3921 | if (unaryop->get_op () == NEGATE_EXPR) | |
3922 | { | |
3923 | /* e.g. "-X <= 0" is equivalent to X >= 0". */ | |
3924 | tristate lhs_ts = eval_condition (unaryop->get_arg (), | |
3925 | swap_tree_comparison (op), | |
3926 | rhs); | |
3927 | if (lhs_ts.is_known ()) | |
3928 | return lhs_ts; | |
3929 | } | |
3930 | } | |
e82e0f14 | 3931 | } |
808f4dfe DM |
3932 | |
3933 | /* Handle rejection of equality for comparisons of the initial values of | |
3934 | "external" values (such as params) with the address of locals. */ | |
3935 | if (const initial_svalue *init_lhs = lhs->dyn_cast_initial_svalue ()) | |
3936 | if (const region_svalue *rhs_ptr = rhs->dyn_cast_region_svalue ()) | |
3937 | { | |
3938 | tristate res = compare_initial_and_pointer (init_lhs, rhs_ptr); | |
3939 | if (res.is_known ()) | |
3940 | return res; | |
3941 | } | |
3942 | if (const initial_svalue *init_rhs = rhs->dyn_cast_initial_svalue ()) | |
3943 | if (const region_svalue *lhs_ptr = lhs->dyn_cast_region_svalue ()) | |
3944 | { | |
3945 | tristate res = compare_initial_and_pointer (init_rhs, lhs_ptr); | |
3946 | if (res.is_known ()) | |
3947 | return res; | |
3948 | } | |
3949 | ||
3950 | if (const widening_svalue *widen_lhs = lhs->dyn_cast_widening_svalue ()) | |
3951 | if (tree rhs_cst = rhs->maybe_get_constant ()) | |
3952 | { | |
3953 | tristate res = widen_lhs->eval_condition_without_cm (op, rhs_cst); | |
3954 | if (res.is_known ()) | |
3955 | return res; | |
3956 | } | |
3957 | ||
7a6564c9 | 3958 | /* Handle comparisons between two svalues with more than one operand. */ |
9bbcee45 | 3959 | if (const binop_svalue *binop = lhs->dyn_cast_binop_svalue ()) |
7a6564c9 TL |
3960 | { |
3961 | switch (op) | |
3962 | { | |
3963 | default: | |
3964 | break; | |
3965 | case EQ_EXPR: | |
3966 | { | |
3967 | /* TODO: binops can be equal even if they are not structurally | |
3968 | equal in case of commutative operators. */ | |
3969 | tristate res = structural_equality (lhs, rhs); | |
3970 | if (res.is_true ()) | |
3971 | return res; | |
3972 | } | |
3973 | break; | |
3974 | case LE_EXPR: | |
3975 | { | |
3976 | tristate res = structural_equality (lhs, rhs); | |
3977 | if (res.is_true ()) | |
3978 | return res; | |
3979 | } | |
3980 | break; | |
3981 | case GE_EXPR: | |
3982 | { | |
3983 | tristate res = structural_equality (lhs, rhs); | |
3984 | if (res.is_true ()) | |
3985 | return res; | |
3986 | res = symbolic_greater_than (binop, rhs); | |
3987 | if (res.is_true ()) | |
3988 | return res; | |
3989 | } | |
3990 | break; | |
3991 | case GT_EXPR: | |
3992 | { | |
3993 | tristate res = symbolic_greater_than (binop, rhs); | |
3994 | if (res.is_true ()) | |
3995 | return res; | |
3996 | } | |
3997 | break; | |
3998 | } | |
3999 | } | |
4000 | ||
9bbcee45 DM |
4001 | /* Otherwise, try constraints. |
4002 | Cast to const to ensure we don't change the constraint_manager as we | |
4003 | do this (e.g. by creating equivalence classes). */ | |
4004 | const constraint_manager *constraints = m_constraints; | |
4005 | return constraints->eval_condition (lhs, op, rhs); | |
808f4dfe DM |
4006 | } |
4007 | ||
9bbcee45 | 4008 | /* Subroutine of region_model::eval_condition, for rejecting |
808f4dfe DM |
4009 | equality of INIT_VAL(PARM) with &LOCAL. */ |
4010 | ||
4011 | tristate | |
4012 | region_model::compare_initial_and_pointer (const initial_svalue *init, | |
4013 | const region_svalue *ptr) const | |
4014 | { | |
4015 | const region *pointee = ptr->get_pointee (); | |
4016 | ||
4017 | /* If we have a pointer to something within a stack frame, it can't be the | |
4018 | initial value of a param. */ | |
4019 | if (pointee->maybe_get_frame_region ()) | |
e0139b2a DM |
4020 | if (init->initial_value_of_param_p ()) |
4021 | return tristate::TS_FALSE; | |
757bf1df DM |
4022 | |
4023 | return tristate::TS_UNKNOWN; | |
4024 | } | |
4025 | ||
7a6564c9 TL |
4026 | /* Return true if SVAL is definitely positive. */ |
4027 | ||
4028 | static bool | |
4029 | is_positive_svalue (const svalue *sval) | |
4030 | { | |
4031 | if (tree cst = sval->maybe_get_constant ()) | |
4032 | return !zerop (cst) && get_range_pos_neg (cst) == 1; | |
4033 | tree type = sval->get_type (); | |
4034 | if (!type) | |
4035 | return false; | |
4036 | /* Consider a binary operation size_t + int. The analyzer wraps the int in | |
4037 | an unaryop_svalue, converting it to a size_t, but in the dynamic execution | |
4038 | the result is smaller than the first operand. Thus, we have to look if | |
4039 | the argument of the unaryop_svalue is also positive. */ | |
4040 | if (const unaryop_svalue *un_op = dyn_cast <const unaryop_svalue *> (sval)) | |
4041 | return CONVERT_EXPR_CODE_P (un_op->get_op ()) && TYPE_UNSIGNED (type) | |
4042 | && is_positive_svalue (un_op->get_arg ()); | |
4043 | return TYPE_UNSIGNED (type); | |
4044 | } | |
4045 | ||
4046 | /* Return true if A is definitely larger than B. | |
4047 | ||
4048 | Limitation: does not account for integer overflows and does not try to | |
4049 | return false, so it can not be used negated. */ | |
4050 | ||
4051 | tristate | |
4052 | region_model::symbolic_greater_than (const binop_svalue *bin_a, | |
4053 | const svalue *b) const | |
4054 | { | |
4055 | if (bin_a->get_op () == PLUS_EXPR || bin_a->get_op () == MULT_EXPR) | |
4056 | { | |
4057 | /* Eliminate the right-hand side of both svalues. */ | |
4058 | if (const binop_svalue *bin_b = dyn_cast <const binop_svalue *> (b)) | |
4059 | if (bin_a->get_op () == bin_b->get_op () | |
9bbcee45 DM |
4060 | && eval_condition (bin_a->get_arg1 (), |
4061 | GT_EXPR, | |
4062 | bin_b->get_arg1 ()).is_true () | |
4063 | && eval_condition (bin_a->get_arg0 (), | |
4064 | GE_EXPR, | |
4065 | bin_b->get_arg0 ()).is_true ()) | |
7a6564c9 TL |
4066 | return tristate (tristate::TS_TRUE); |
4067 | ||
4068 | /* Otherwise, try to remove a positive offset or factor from BIN_A. */ | |
4069 | if (is_positive_svalue (bin_a->get_arg1 ()) | |
9bbcee45 DM |
4070 | && eval_condition (bin_a->get_arg0 (), |
4071 | GE_EXPR, b).is_true ()) | |
7a6564c9 TL |
4072 | return tristate (tristate::TS_TRUE); |
4073 | } | |
4074 | return tristate::unknown (); | |
4075 | } | |
4076 | ||
4077 | /* Return true if A and B are equal structurally. | |
4078 | ||
4079 | Structural equality means that A and B are equal if the svalues A and B have | |
4080 | the same nodes at the same positions in the tree and the leafs are equal. | |
4081 | Equality for conjured_svalues and initial_svalues is determined by comparing | |
4082 | the pointers while constants are compared by value. That behavior is useful | |
4083 | to check for binaryop_svlaues that evaluate to the same concrete value but | |
4084 | might use one operand with a different type but the same constant value. | |
4085 | ||
4086 | For example, | |
4087 | binop_svalue (mult_expr, | |
4088 | initial_svalue (‘size_t’, decl_region (..., 'some_var')), | |
4089 | constant_svalue (‘size_t’, 4)) | |
4090 | and | |
4091 | binop_svalue (mult_expr, | |
4092 | initial_svalue (‘size_t’, decl_region (..., 'some_var'), | |
4093 | constant_svalue (‘sizetype’, 4)) | |
4094 | are structurally equal. A concrete C code example, where this occurs, can | |
4095 | be found in test7 of out-of-bounds-5.c. */ | |
4096 | ||
4097 | tristate | |
4098 | region_model::structural_equality (const svalue *a, const svalue *b) const | |
4099 | { | |
4100 | /* If A and B are referentially equal, they are also structurally equal. */ | |
4101 | if (a == b) | |
4102 | return tristate (tristate::TS_TRUE); | |
4103 | ||
4104 | switch (a->get_kind ()) | |
4105 | { | |
4106 | default: | |
4107 | return tristate::unknown (); | |
4108 | /* SK_CONJURED and SK_INITIAL are already handled | |
4109 | by the referential equality above. */ | |
4110 | case SK_CONSTANT: | |
4111 | { | |
4112 | tree a_cst = a->maybe_get_constant (); | |
4113 | tree b_cst = b->maybe_get_constant (); | |
4114 | if (a_cst && b_cst) | |
4115 | return tristate (tree_int_cst_equal (a_cst, b_cst)); | |
4116 | } | |
4117 | return tristate (tristate::TS_FALSE); | |
4118 | case SK_UNARYOP: | |
4119 | { | |
4120 | const unaryop_svalue *un_a = as_a <const unaryop_svalue *> (a); | |
4121 | if (const unaryop_svalue *un_b = dyn_cast <const unaryop_svalue *> (b)) | |
4122 | return tristate (pending_diagnostic::same_tree_p (un_a->get_type (), | |
4123 | un_b->get_type ()) | |
4124 | && un_a->get_op () == un_b->get_op () | |
4125 | && structural_equality (un_a->get_arg (), | |
4126 | un_b->get_arg ())); | |
4127 | } | |
4128 | return tristate (tristate::TS_FALSE); | |
4129 | case SK_BINOP: | |
4130 | { | |
4131 | const binop_svalue *bin_a = as_a <const binop_svalue *> (a); | |
4132 | if (const binop_svalue *bin_b = dyn_cast <const binop_svalue *> (b)) | |
4133 | return tristate (bin_a->get_op () == bin_b->get_op () | |
4134 | && structural_equality (bin_a->get_arg0 (), | |
4135 | bin_b->get_arg0 ()) | |
4136 | && structural_equality (bin_a->get_arg1 (), | |
4137 | bin_b->get_arg1 ())); | |
4138 | } | |
4139 | return tristate (tristate::TS_FALSE); | |
4140 | } | |
4141 | } | |
4142 | ||
48e8a7a6 DM |
4143 | /* Handle various constraints of the form: |
4144 | LHS: ((bool)INNER_LHS INNER_OP INNER_RHS)) | |
4145 | OP : == or != | |
4146 | RHS: zero | |
4147 | and (with a cast): | |
4148 | LHS: CAST([long]int, ((bool)INNER_LHS INNER_OP INNER_RHS)) | |
4149 | OP : == or != | |
4150 | RHS: zero | |
4151 | by adding constraints for INNER_LHS INNEROP INNER_RHS. | |
4152 | ||
4153 | Return true if this function can fully handle the constraint; if | |
4154 | so, add the implied constraint(s) and write true to *OUT if they | |
4155 | are consistent with existing constraints, or write false to *OUT | |
4156 | if they contradicts existing constraints. | |
4157 | ||
4158 | Return false for cases that this function doeesn't know how to handle. | |
4159 | ||
4160 | For example, if we're checking a stored conditional, we'll have | |
4161 | something like: | |
4162 | LHS: CAST(long int, (&HEAP_ALLOCATED_REGION(8)!=(int *)0B)) | |
4163 | OP : NE_EXPR | |
4164 | RHS: zero | |
4165 | which this function can turn into an add_constraint of: | |
4166 | (&HEAP_ALLOCATED_REGION(8) != (int *)0B) | |
4167 | ||
4168 | Similarly, optimized && and || conditionals lead to e.g. | |
4169 | if (p && q) | |
4170 | becoming gimple like this: | |
4171 | _1 = p_6 == 0B; | |
4172 | _2 = q_8 == 0B | |
4173 | _3 = _1 | _2 | |
4174 | On the "_3 is false" branch we can have constraints of the form: | |
4175 | ((&HEAP_ALLOCATED_REGION(8)!=(int *)0B) | |
4176 | | (&HEAP_ALLOCATED_REGION(10)!=(int *)0B)) | |
4177 | == 0 | |
4178 | which implies that both _1 and _2 are false, | |
4179 | which this function can turn into a pair of add_constraints of | |
4180 | (&HEAP_ALLOCATED_REGION(8)!=(int *)0B) | |
4181 | and: | |
4182 | (&HEAP_ALLOCATED_REGION(10)!=(int *)0B). */ | |
4183 | ||
4184 | bool | |
4185 | region_model::add_constraints_from_binop (const svalue *outer_lhs, | |
4186 | enum tree_code outer_op, | |
4187 | const svalue *outer_rhs, | |
4188 | bool *out, | |
4189 | region_model_context *ctxt) | |
4190 | { | |
4191 | while (const svalue *cast = outer_lhs->maybe_undo_cast ()) | |
4192 | outer_lhs = cast; | |
4193 | const binop_svalue *binop_sval = outer_lhs->dyn_cast_binop_svalue (); | |
4194 | if (!binop_sval) | |
4195 | return false; | |
4196 | if (!outer_rhs->all_zeroes_p ()) | |
4197 | return false; | |
4198 | ||
4199 | const svalue *inner_lhs = binop_sval->get_arg0 (); | |
4200 | enum tree_code inner_op = binop_sval->get_op (); | |
4201 | const svalue *inner_rhs = binop_sval->get_arg1 (); | |
4202 | ||
4203 | if (outer_op != NE_EXPR && outer_op != EQ_EXPR) | |
4204 | return false; | |
4205 | ||
4206 | /* We have either | |
4207 | - "OUTER_LHS != false" (i.e. OUTER is true), or | |
4208 | - "OUTER_LHS == false" (i.e. OUTER is false). */ | |
4209 | bool is_true = outer_op == NE_EXPR; | |
4210 | ||
4211 | switch (inner_op) | |
4212 | { | |
4213 | default: | |
4214 | return false; | |
4215 | ||
4216 | case EQ_EXPR: | |
4217 | case NE_EXPR: | |
4218 | { | |
4219 | /* ...and "(inner_lhs OP inner_rhs) == 0" | |
4220 | then (inner_lhs OP inner_rhs) must have the same | |
4221 | logical value as LHS. */ | |
4222 | if (!is_true) | |
4223 | inner_op = invert_tree_comparison (inner_op, false /* honor_nans */); | |
4224 | *out = add_constraint (inner_lhs, inner_op, inner_rhs, ctxt); | |
4225 | return true; | |
4226 | } | |
4227 | break; | |
4228 | ||
4229 | case BIT_AND_EXPR: | |
4230 | if (is_true) | |
4231 | { | |
4232 | /* ...and "(inner_lhs & inner_rhs) != 0" | |
4233 | then both inner_lhs and inner_rhs must be true. */ | |
4234 | const svalue *false_sval | |
4235 | = m_mgr->get_or_create_constant_svalue (boolean_false_node); | |
4236 | bool sat1 = add_constraint (inner_lhs, NE_EXPR, false_sval, ctxt); | |
4237 | bool sat2 = add_constraint (inner_rhs, NE_EXPR, false_sval, ctxt); | |
4238 | *out = sat1 && sat2; | |
4239 | return true; | |
4240 | } | |
4241 | return false; | |
4242 | ||
4243 | case BIT_IOR_EXPR: | |
4244 | if (!is_true) | |
4245 | { | |
4246 | /* ...and "(inner_lhs | inner_rhs) == 0" | |
4247 | i.e. "(inner_lhs | inner_rhs)" is false | |
4248 | then both inner_lhs and inner_rhs must be false. */ | |
4249 | const svalue *false_sval | |
4250 | = m_mgr->get_or_create_constant_svalue (boolean_false_node); | |
4251 | bool sat1 = add_constraint (inner_lhs, EQ_EXPR, false_sval, ctxt); | |
4252 | bool sat2 = add_constraint (inner_rhs, EQ_EXPR, false_sval, ctxt); | |
4253 | *out = sat1 && sat2; | |
4254 | return true; | |
4255 | } | |
4256 | return false; | |
4257 | } | |
4258 | } | |
4259 | ||
757bf1df DM |
4260 | /* Attempt to add the constraint "LHS OP RHS" to this region_model. |
4261 | If it is consistent with existing constraints, add it, and return true. | |
4262 | Return false if it contradicts existing constraints. | |
4263 | Use CTXT for reporting any diagnostics associated with the accesses. */ | |
4264 | ||
4265 | bool | |
4266 | region_model::add_constraint (tree lhs, enum tree_code op, tree rhs, | |
4267 | region_model_context *ctxt) | |
4268 | { | |
e978955d DM |
4269 | /* For now, make no attempt to capture constraints on floating-point |
4270 | values. */ | |
4271 | if (FLOAT_TYPE_P (TREE_TYPE (lhs)) || FLOAT_TYPE_P (TREE_TYPE (rhs))) | |
4272 | return true; | |
4273 | ||
808f4dfe DM |
4274 | const svalue *lhs_sval = get_rvalue (lhs, ctxt); |
4275 | const svalue *rhs_sval = get_rvalue (rhs, ctxt); | |
757bf1df | 4276 | |
48e8a7a6 DM |
4277 | return add_constraint (lhs_sval, op, rhs_sval, ctxt); |
4278 | } | |
4279 | ||
4280 | /* Attempt to add the constraint "LHS OP RHS" to this region_model. | |
4281 | If it is consistent with existing constraints, add it, and return true. | |
4282 | Return false if it contradicts existing constraints. | |
4283 | Use CTXT for reporting any diagnostics associated with the accesses. */ | |
4284 | ||
4285 | bool | |
4286 | region_model::add_constraint (const svalue *lhs, | |
4287 | enum tree_code op, | |
4288 | const svalue *rhs, | |
4289 | region_model_context *ctxt) | |
4290 | { | |
4291 | tristate t_cond = eval_condition (lhs, op, rhs); | |
757bf1df DM |
4292 | |
4293 | /* If we already have the condition, do nothing. */ | |
4294 | if (t_cond.is_true ()) | |
4295 | return true; | |
4296 | ||
4297 | /* Reject a constraint that would contradict existing knowledge, as | |
4298 | unsatisfiable. */ | |
4299 | if (t_cond.is_false ()) | |
4300 | return false; | |
4301 | ||
48e8a7a6 DM |
4302 | bool out; |
4303 | if (add_constraints_from_binop (lhs, op, rhs, &out, ctxt)) | |
4304 | return out; | |
757bf1df | 4305 | |
c4b8f373 DM |
4306 | /* Attempt to store the constraint. */ |
4307 | if (!m_constraints->add_constraint (lhs, op, rhs)) | |
4308 | return false; | |
757bf1df DM |
4309 | |
4310 | /* Notify the context, if any. This exists so that the state machines | |
4311 | in a program_state can be notified about the condition, and so can | |
4312 | set sm-state for e.g. unchecked->checked, both for cfg-edges, and | |
4313 | when synthesizing constraints as above. */ | |
4314 | if (ctxt) | |
4315 | ctxt->on_condition (lhs, op, rhs); | |
4316 | ||
9a2c9579 DM |
4317 | /* If we have ®ION == NULL, then drop dynamic extents for REGION (for |
4318 | the case where REGION is heap-allocated and thus could be NULL). */ | |
48e8a7a6 DM |
4319 | if (tree rhs_cst = rhs->maybe_get_constant ()) |
4320 | if (op == EQ_EXPR && zerop (rhs_cst)) | |
4321 | if (const region_svalue *region_sval = lhs->dyn_cast_region_svalue ()) | |
4322 | unset_dynamic_extents (region_sval->get_pointee ()); | |
9a2c9579 | 4323 | |
757bf1df DM |
4324 | return true; |
4325 | } | |
4326 | ||
84fb3546 DM |
4327 | /* As above, but when returning false, if OUT is non-NULL, write a |
4328 | new rejected_constraint to *OUT. */ | |
4329 | ||
4330 | bool | |
4331 | region_model::add_constraint (tree lhs, enum tree_code op, tree rhs, | |
4332 | region_model_context *ctxt, | |
4333 | rejected_constraint **out) | |
4334 | { | |
4335 | bool sat = add_constraint (lhs, op, rhs, ctxt); | |
4336 | if (!sat && out) | |
8ca7fa84 | 4337 | *out = new rejected_op_constraint (*this, lhs, op, rhs); |
84fb3546 DM |
4338 | return sat; |
4339 | } | |
4340 | ||
757bf1df DM |
4341 | /* Determine what is known about the condition "LHS OP RHS" within |
4342 | this model. | |
4343 | Use CTXT for reporting any diagnostics associated with the accesses. */ | |
4344 | ||
4345 | tristate | |
4346 | region_model::eval_condition (tree lhs, | |
4347 | enum tree_code op, | |
4348 | tree rhs, | |
5c6546ca | 4349 | region_model_context *ctxt) const |
757bf1df | 4350 | { |
e978955d DM |
4351 | /* For now, make no attempt to model constraints on floating-point |
4352 | values. */ | |
4353 | if (FLOAT_TYPE_P (TREE_TYPE (lhs)) || FLOAT_TYPE_P (TREE_TYPE (rhs))) | |
4354 | return tristate::unknown (); | |
4355 | ||
757bf1df DM |
4356 | return eval_condition (get_rvalue (lhs, ctxt), op, get_rvalue (rhs, ctxt)); |
4357 | } | |
4358 | ||
467a4820 DM |
4359 | /* Implementation of region_model::get_representative_path_var. |
4360 | Attempt to return a path_var that represents SVAL, or return NULL_TREE. | |
808f4dfe DM |
4361 | Use VISITED to prevent infinite mutual recursion with the overload for |
4362 | regions. */ | |
757bf1df | 4363 | |
808f4dfe | 4364 | path_var |
467a4820 DM |
4365 | region_model::get_representative_path_var_1 (const svalue *sval, |
4366 | svalue_set *visited) const | |
757bf1df | 4367 | { |
467a4820 | 4368 | gcc_assert (sval); |
757bf1df | 4369 | |
808f4dfe DM |
4370 | /* Prevent infinite recursion. */ |
4371 | if (visited->contains (sval)) | |
0e466e97 DM |
4372 | { |
4373 | if (sval->get_kind () == SK_CONSTANT) | |
4374 | return path_var (sval->maybe_get_constant (), 0); | |
4375 | else | |
4376 | return path_var (NULL_TREE, 0); | |
4377 | } | |
808f4dfe | 4378 | visited->add (sval); |
757bf1df | 4379 | |
467a4820 DM |
4380 | /* Handle casts by recursion into get_representative_path_var. */ |
4381 | if (const svalue *cast_sval = sval->maybe_undo_cast ()) | |
4382 | { | |
4383 | path_var result = get_representative_path_var (cast_sval, visited); | |
4384 | tree orig_type = sval->get_type (); | |
4385 | /* If necessary, wrap the result in a cast. */ | |
4386 | if (result.m_tree && orig_type) | |
4387 | result.m_tree = build1 (NOP_EXPR, orig_type, result.m_tree); | |
4388 | return result; | |
4389 | } | |
4390 | ||
808f4dfe DM |
4391 | auto_vec<path_var> pvs; |
4392 | m_store.get_representative_path_vars (this, visited, sval, &pvs); | |
757bf1df | 4393 | |
808f4dfe DM |
4394 | if (tree cst = sval->maybe_get_constant ()) |
4395 | pvs.safe_push (path_var (cst, 0)); | |
757bf1df | 4396 | |
90f7c300 | 4397 | /* Handle string literals and various other pointers. */ |
808f4dfe DM |
4398 | if (const region_svalue *ptr_sval = sval->dyn_cast_region_svalue ()) |
4399 | { | |
4400 | const region *reg = ptr_sval->get_pointee (); | |
4401 | if (path_var pv = get_representative_path_var (reg, visited)) | |
4402 | return path_var (build1 (ADDR_EXPR, | |
467a4820 | 4403 | sval->get_type (), |
808f4dfe DM |
4404 | pv.m_tree), |
4405 | pv.m_stack_depth); | |
4406 | } | |
4407 | ||
4408 | /* If we have a sub_svalue, look for ways to represent the parent. */ | |
4409 | if (const sub_svalue *sub_sval = sval->dyn_cast_sub_svalue ()) | |
90f7c300 | 4410 | { |
808f4dfe DM |
4411 | const svalue *parent_sval = sub_sval->get_parent (); |
4412 | const region *subreg = sub_sval->get_subregion (); | |
4413 | if (path_var parent_pv | |
4414 | = get_representative_path_var (parent_sval, visited)) | |
4415 | if (const field_region *field_reg = subreg->dyn_cast_field_region ()) | |
4416 | return path_var (build3 (COMPONENT_REF, | |
4417 | sval->get_type (), | |
4418 | parent_pv.m_tree, | |
4419 | field_reg->get_field (), | |
4420 | NULL_TREE), | |
4421 | parent_pv.m_stack_depth); | |
90f7c300 DM |
4422 | } |
4423 | ||
b9365b93 DM |
4424 | /* Handle binops. */ |
4425 | if (const binop_svalue *binop_sval = sval->dyn_cast_binop_svalue ()) | |
4426 | if (path_var lhs_pv | |
4427 | = get_representative_path_var (binop_sval->get_arg0 (), visited)) | |
4428 | if (path_var rhs_pv | |
4429 | = get_representative_path_var (binop_sval->get_arg1 (), visited)) | |
4430 | return path_var (build2 (binop_sval->get_op (), | |
4431 | sval->get_type (), | |
4432 | lhs_pv.m_tree, rhs_pv.m_tree), | |
4433 | lhs_pv.m_stack_depth); | |
4434 | ||
808f4dfe DM |
4435 | if (pvs.length () < 1) |
4436 | return path_var (NULL_TREE, 0); | |
4437 | ||
4438 | pvs.qsort (readability_comparator); | |
4439 | return pvs[0]; | |
757bf1df DM |
4440 | } |
4441 | ||
467a4820 DM |
4442 | /* Attempt to return a path_var that represents SVAL, or return NULL_TREE. |
4443 | Use VISITED to prevent infinite mutual recursion with the overload for | |
4444 | regions | |
4445 | ||
4446 | This function defers to get_representative_path_var_1 to do the work; | |
4447 | it adds verification that get_representative_path_var_1 returned a tree | |
4448 | of the correct type. */ | |
4449 | ||
4450 | path_var | |
4451 | region_model::get_representative_path_var (const svalue *sval, | |
4452 | svalue_set *visited) const | |
4453 | { | |
4454 | if (sval == NULL) | |
4455 | return path_var (NULL_TREE, 0); | |
4456 | ||
4457 | tree orig_type = sval->get_type (); | |
4458 | ||
4459 | path_var result = get_representative_path_var_1 (sval, visited); | |
4460 | ||
4461 | /* Verify that the result has the same type as SVAL, if any. */ | |
4462 | if (result.m_tree && orig_type) | |
4463 | gcc_assert (TREE_TYPE (result.m_tree) == orig_type); | |
4464 | ||
4465 | return result; | |
4466 | } | |
4467 | ||
4468 | /* Attempt to return a tree that represents SVAL, or return NULL_TREE. | |
4469 | ||
4470 | Strip off any top-level cast, to avoid messages like | |
4471 | double-free of '(void *)ptr' | |
4472 | from analyzer diagnostics. */ | |
757bf1df | 4473 | |
808f4dfe DM |
4474 | tree |
4475 | region_model::get_representative_tree (const svalue *sval) const | |
757bf1df | 4476 | { |
808f4dfe | 4477 | svalue_set visited; |
467a4820 DM |
4478 | tree expr = get_representative_path_var (sval, &visited).m_tree; |
4479 | ||
4480 | /* Strip off any top-level cast. */ | |
7e3b45be TL |
4481 | if (expr && TREE_CODE (expr) == NOP_EXPR) |
4482 | expr = TREE_OPERAND (expr, 0); | |
4483 | ||
4484 | return fixup_tree_for_diagnostic (expr); | |
4485 | } | |
4486 | ||
4487 | tree | |
4488 | region_model::get_representative_tree (const region *reg) const | |
4489 | { | |
4490 | svalue_set visited; | |
4491 | tree expr = get_representative_path_var (reg, &visited).m_tree; | |
4492 | ||
4493 | /* Strip off any top-level cast. */ | |
467a4820 | 4494 | if (expr && TREE_CODE (expr) == NOP_EXPR) |
e4bb1bd6 | 4495 | expr = TREE_OPERAND (expr, 0); |
467a4820 | 4496 | |
e4bb1bd6 | 4497 | return fixup_tree_for_diagnostic (expr); |
808f4dfe DM |
4498 | } |
4499 | ||
467a4820 DM |
4500 | /* Implementation of region_model::get_representative_path_var. |
4501 | ||
4502 | Attempt to return a path_var that represents REG, or return | |
808f4dfe DM |
4503 | the NULL path_var. |
4504 | For example, a region for a field of a local would be a path_var | |
4505 | wrapping a COMPONENT_REF. | |
4506 | Use VISITED to prevent infinite mutual recursion with the overload for | |
4507 | svalues. */ | |
757bf1df | 4508 | |
808f4dfe | 4509 | path_var |
467a4820 DM |
4510 | region_model::get_representative_path_var_1 (const region *reg, |
4511 | svalue_set *visited) const | |
808f4dfe DM |
4512 | { |
4513 | switch (reg->get_kind ()) | |
757bf1df | 4514 | { |
808f4dfe DM |
4515 | default: |
4516 | gcc_unreachable (); | |
e516294a | 4517 | |
808f4dfe DM |
4518 | case RK_FRAME: |
4519 | case RK_GLOBALS: | |
4520 | case RK_CODE: | |
4521 | case RK_HEAP: | |
4522 | case RK_STACK: | |
358dab90 | 4523 | case RK_THREAD_LOCAL: |
808f4dfe DM |
4524 | case RK_ROOT: |
4525 | /* Regions that represent memory spaces are not expressible as trees. */ | |
4526 | return path_var (NULL_TREE, 0); | |
757bf1df | 4527 | |
808f4dfe | 4528 | case RK_FUNCTION: |
884d9141 | 4529 | { |
808f4dfe DM |
4530 | const function_region *function_reg |
4531 | = as_a <const function_region *> (reg); | |
4532 | return path_var (function_reg->get_fndecl (), 0); | |
884d9141 | 4533 | } |
808f4dfe | 4534 | case RK_LABEL: |
9e78634c DM |
4535 | { |
4536 | const label_region *label_reg = as_a <const label_region *> (reg); | |
4537 | return path_var (label_reg->get_label (), 0); | |
4538 | } | |
90f7c300 | 4539 | |
808f4dfe DM |
4540 | case RK_SYMBOLIC: |
4541 | { | |
4542 | const symbolic_region *symbolic_reg | |
4543 | = as_a <const symbolic_region *> (reg); | |
4544 | const svalue *pointer = symbolic_reg->get_pointer (); | |
4545 | path_var pointer_pv = get_representative_path_var (pointer, visited); | |
4546 | if (!pointer_pv) | |
4547 | return path_var (NULL_TREE, 0); | |
4548 | tree offset = build_int_cst (pointer->get_type (), 0); | |
4549 | return path_var (build2 (MEM_REF, | |
4550 | reg->get_type (), | |
4551 | pointer_pv.m_tree, | |
4552 | offset), | |
4553 | pointer_pv.m_stack_depth); | |
4554 | } | |
4555 | case RK_DECL: | |
4556 | { | |
4557 | const decl_region *decl_reg = as_a <const decl_region *> (reg); | |
4558 | return path_var (decl_reg->get_decl (), decl_reg->get_stack_depth ()); | |
4559 | } | |
4560 | case RK_FIELD: | |
4561 | { | |
4562 | const field_region *field_reg = as_a <const field_region *> (reg); | |
4563 | path_var parent_pv | |
4564 | = get_representative_path_var (reg->get_parent_region (), visited); | |
4565 | if (!parent_pv) | |
4566 | return path_var (NULL_TREE, 0); | |
4567 | return path_var (build3 (COMPONENT_REF, | |
4568 | reg->get_type (), | |
4569 | parent_pv.m_tree, | |
4570 | field_reg->get_field (), | |
4571 | NULL_TREE), | |
4572 | parent_pv.m_stack_depth); | |
4573 | } | |
757bf1df | 4574 | |
808f4dfe DM |
4575 | case RK_ELEMENT: |
4576 | { | |
4577 | const element_region *element_reg | |
4578 | = as_a <const element_region *> (reg); | |
4579 | path_var parent_pv | |
4580 | = get_representative_path_var (reg->get_parent_region (), visited); | |
4581 | if (!parent_pv) | |
4582 | return path_var (NULL_TREE, 0); | |
4583 | path_var index_pv | |
4584 | = get_representative_path_var (element_reg->get_index (), visited); | |
4585 | if (!index_pv) | |
4586 | return path_var (NULL_TREE, 0); | |
4587 | return path_var (build4 (ARRAY_REF, | |
4588 | reg->get_type (), | |
4589 | parent_pv.m_tree, index_pv.m_tree, | |
4590 | NULL_TREE, NULL_TREE), | |
4591 | parent_pv.m_stack_depth); | |
4592 | } | |
757bf1df | 4593 | |
808f4dfe | 4594 | case RK_OFFSET: |
757bf1df | 4595 | { |
808f4dfe DM |
4596 | const offset_region *offset_reg |
4597 | = as_a <const offset_region *> (reg); | |
4598 | path_var parent_pv | |
4599 | = get_representative_path_var (reg->get_parent_region (), visited); | |
4600 | if (!parent_pv) | |
4601 | return path_var (NULL_TREE, 0); | |
4602 | path_var offset_pv | |
4603 | = get_representative_path_var (offset_reg->get_byte_offset (), | |
4604 | visited); | |
29f5db8e | 4605 | if (!offset_pv || TREE_CODE (offset_pv.m_tree) != INTEGER_CST) |
808f4dfe | 4606 | return path_var (NULL_TREE, 0); |
29f5db8e DM |
4607 | tree addr_parent = build1 (ADDR_EXPR, |
4608 | build_pointer_type (reg->get_type ()), | |
4609 | parent_pv.m_tree); | |
808f4dfe DM |
4610 | return path_var (build2 (MEM_REF, |
4611 | reg->get_type (), | |
29f5db8e | 4612 | addr_parent, offset_pv.m_tree), |
808f4dfe | 4613 | parent_pv.m_stack_depth); |
757bf1df | 4614 | } |
757bf1df | 4615 | |
e61ffa20 DM |
4616 | case RK_SIZED: |
4617 | return path_var (NULL_TREE, 0); | |
4618 | ||
808f4dfe DM |
4619 | case RK_CAST: |
4620 | { | |
4621 | path_var parent_pv | |
4622 | = get_representative_path_var (reg->get_parent_region (), visited); | |
4623 | if (!parent_pv) | |
4624 | return path_var (NULL_TREE, 0); | |
4625 | return path_var (build1 (NOP_EXPR, | |
4626 | reg->get_type (), | |
4627 | parent_pv.m_tree), | |
4628 | parent_pv.m_stack_depth); | |
4629 | } | |
757bf1df | 4630 | |
808f4dfe DM |
4631 | case RK_HEAP_ALLOCATED: |
4632 | case RK_ALLOCA: | |
4633 | /* No good way to express heap-allocated/alloca regions as trees. */ | |
4634 | return path_var (NULL_TREE, 0); | |
757bf1df | 4635 | |
808f4dfe DM |
4636 | case RK_STRING: |
4637 | { | |
4638 | const string_region *string_reg = as_a <const string_region *> (reg); | |
4639 | return path_var (string_reg->get_string_cst (), 0); | |
4640 | } | |
757bf1df | 4641 | |
2402dc6b | 4642 | case RK_VAR_ARG: |
358dab90 | 4643 | case RK_ERRNO: |
808f4dfe DM |
4644 | case RK_UNKNOWN: |
4645 | return path_var (NULL_TREE, 0); | |
4646 | } | |
757bf1df DM |
4647 | } |
4648 | ||
467a4820 DM |
4649 | /* Attempt to return a path_var that represents REG, or return |
4650 | the NULL path_var. | |
4651 | For example, a region for a field of a local would be a path_var | |
4652 | wrapping a COMPONENT_REF. | |
4653 | Use VISITED to prevent infinite mutual recursion with the overload for | |
4654 | svalues. | |
4655 | ||
4656 | This function defers to get_representative_path_var_1 to do the work; | |
4657 | it adds verification that get_representative_path_var_1 returned a tree | |
4658 | of the correct type. */ | |
4659 | ||
4660 | path_var | |
4661 | region_model::get_representative_path_var (const region *reg, | |
4662 | svalue_set *visited) const | |
4663 | { | |
4664 | path_var result = get_representative_path_var_1 (reg, visited); | |
4665 | ||
4666 | /* Verify that the result has the same type as REG, if any. */ | |
4667 | if (result.m_tree && reg->get_type ()) | |
4668 | gcc_assert (TREE_TYPE (result.m_tree) == reg->get_type ()); | |
4669 | ||
4670 | return result; | |
4671 | } | |
4672 | ||
757bf1df DM |
4673 | /* Update this model for any phis in SNODE, assuming we came from |
4674 | LAST_CFG_SUPEREDGE. */ | |
4675 | ||
4676 | void | |
4677 | region_model::update_for_phis (const supernode *snode, | |
4678 | const cfg_superedge *last_cfg_superedge, | |
4679 | region_model_context *ctxt) | |
4680 | { | |
4681 | gcc_assert (last_cfg_superedge); | |
4682 | ||
e0a7a675 DM |
4683 | /* Copy this state and pass it to handle_phi so that all of the phi stmts |
4684 | are effectively handled simultaneously. */ | |
4685 | const region_model old_state (*this); | |
4686 | ||
757bf1df DM |
4687 | for (gphi_iterator gpi = const_cast<supernode *>(snode)->start_phis (); |
4688 | !gsi_end_p (gpi); gsi_next (&gpi)) | |
4689 | { | |
4690 | gphi *phi = gpi.phi (); | |
4691 | ||
4692 | tree src = last_cfg_superedge->get_phi_arg (phi); | |
4693 | tree lhs = gimple_phi_result (phi); | |
4694 | ||
e0a7a675 DM |
4695 | /* Update next_state based on phi and old_state. */ |
4696 | handle_phi (phi, lhs, src, old_state, ctxt); | |
757bf1df DM |
4697 | } |
4698 | } | |
4699 | ||
4700 | /* Attempt to update this model for taking EDGE (where the last statement | |
4701 | was LAST_STMT), returning true if the edge can be taken, false | |
4702 | otherwise. | |
84fb3546 DM |
4703 | When returning false, if OUT is non-NULL, write a new rejected_constraint |
4704 | to it. | |
757bf1df DM |
4705 | |
4706 | For CFG superedges where LAST_STMT is a conditional or a switch | |
4707 | statement, attempt to add the relevant conditions for EDGE to this | |
4708 | model, returning true if they are feasible, or false if they are | |
4709 | impossible. | |
4710 | ||
4711 | For call superedges, push frame information and store arguments | |
4712 | into parameters. | |
4713 | ||
4714 | For return superedges, pop frame information and store return | |
4715 | values into any lhs. | |
4716 | ||
4717 | Rejection of call/return superedges happens elsewhere, in | |
4718 | program_point::on_edge (i.e. based on program point, rather | |
4719 | than program state). */ | |
4720 | ||
4721 | bool | |
4722 | region_model::maybe_update_for_edge (const superedge &edge, | |
4723 | const gimple *last_stmt, | |
84fb3546 DM |
4724 | region_model_context *ctxt, |
4725 | rejected_constraint **out) | |
757bf1df DM |
4726 | { |
4727 | /* Handle frame updates for interprocedural edges. */ | |
4728 | switch (edge.m_kind) | |
4729 | { | |
4730 | default: | |
4731 | break; | |
4732 | ||
4733 | case SUPEREDGE_CALL: | |
4734 | { | |
4735 | const call_superedge *call_edge = as_a <const call_superedge *> (&edge); | |
4736 | update_for_call_superedge (*call_edge, ctxt); | |
4737 | } | |
4738 | break; | |
4739 | ||
4740 | case SUPEREDGE_RETURN: | |
4741 | { | |
4742 | const return_superedge *return_edge | |
4743 | = as_a <const return_superedge *> (&edge); | |
4744 | update_for_return_superedge (*return_edge, ctxt); | |
4745 | } | |
4746 | break; | |
4747 | ||
4748 | case SUPEREDGE_INTRAPROCEDURAL_CALL: | |
bfca9505 DM |
4749 | /* This is a no-op for call summaries; we should already |
4750 | have handled the effect of the call summary at the call stmt. */ | |
757bf1df DM |
4751 | break; |
4752 | } | |
4753 | ||
4754 | if (last_stmt == NULL) | |
4755 | return true; | |
4756 | ||
4757 | /* Apply any constraints for conditionals/switch statements. */ | |
4758 | ||
4759 | if (const gcond *cond_stmt = dyn_cast <const gcond *> (last_stmt)) | |
4760 | { | |
4761 | const cfg_superedge *cfg_sedge = as_a <const cfg_superedge *> (&edge); | |
84fb3546 | 4762 | return apply_constraints_for_gcond (*cfg_sedge, cond_stmt, ctxt, out); |
757bf1df DM |
4763 | } |
4764 | ||
4765 | if (const gswitch *switch_stmt = dyn_cast <const gswitch *> (last_stmt)) | |
4766 | { | |
4767 | const switch_cfg_superedge *switch_sedge | |
4768 | = as_a <const switch_cfg_superedge *> (&edge); | |
84fb3546 DM |
4769 | return apply_constraints_for_gswitch (*switch_sedge, switch_stmt, |
4770 | ctxt, out); | |
757bf1df DM |
4771 | } |
4772 | ||
1690a839 DM |
4773 | /* Apply any constraints due to an exception being thrown. */ |
4774 | if (const cfg_superedge *cfg_sedge = dyn_cast <const cfg_superedge *> (&edge)) | |
4775 | if (cfg_sedge->get_flags () & EDGE_EH) | |
84fb3546 | 4776 | return apply_constraints_for_exception (last_stmt, ctxt, out); |
1690a839 | 4777 | |
757bf1df DM |
4778 | return true; |
4779 | } | |
4780 | ||
4781 | /* Push a new frame_region on to the stack region. | |
4782 | Populate the frame_region with child regions for the function call's | |
4783 | parameters, using values from the arguments at the callsite in the | |
4784 | caller's frame. */ | |
4785 | ||
4786 | void | |
aef703cf | 4787 | region_model::update_for_gcall (const gcall *call_stmt, |
e92d0ff6 AS |
4788 | region_model_context *ctxt, |
4789 | function *callee) | |
757bf1df | 4790 | { |
808f4dfe | 4791 | /* Build a vec of argument svalues, using the current top |
757bf1df | 4792 | frame for resolving tree expressions. */ |
808f4dfe | 4793 | auto_vec<const svalue *> arg_svals (gimple_call_num_args (call_stmt)); |
757bf1df DM |
4794 | |
4795 | for (unsigned i = 0; i < gimple_call_num_args (call_stmt); i++) | |
4796 | { | |
4797 | tree arg = gimple_call_arg (call_stmt, i); | |
808f4dfe | 4798 | arg_svals.quick_push (get_rvalue (arg, ctxt)); |
757bf1df DM |
4799 | } |
4800 | ||
e92d0ff6 AS |
4801 | if(!callee) |
4802 | { | |
4803 | /* Get the function * from the gcall. */ | |
4804 | tree fn_decl = get_fndecl_for_call (call_stmt,ctxt); | |
4805 | callee = DECL_STRUCT_FUNCTION (fn_decl); | |
4806 | } | |
4807 | ||
4808 | push_frame (callee, &arg_svals, ctxt); | |
757bf1df DM |
4809 | } |
4810 | ||
a96f1c38 DM |
4811 | /* Pop the top-most frame_region from the stack, and copy the return |
4812 | region's values (if any) into the region for the lvalue of the LHS of | |
757bf1df | 4813 | the call (if any). */ |
aef703cf | 4814 | |
757bf1df | 4815 | void |
aef703cf AS |
4816 | region_model::update_for_return_gcall (const gcall *call_stmt, |
4817 | region_model_context *ctxt) | |
757bf1df | 4818 | { |
4cebae09 DM |
4819 | /* Get the lvalue for the result of the call, passing it to pop_frame, |
4820 | so that pop_frame can determine the region with respect to the | |
4821 | *caller* frame. */ | |
757bf1df | 4822 | tree lhs = gimple_call_lhs (call_stmt); |
4cebae09 | 4823 | pop_frame (lhs, NULL, ctxt); |
757bf1df DM |
4824 | } |
4825 | ||
aef703cf AS |
4826 | /* Extract calling information from the superedge and update the model for the |
4827 | call */ | |
4828 | ||
4829 | void | |
4830 | region_model::update_for_call_superedge (const call_superedge &call_edge, | |
4831 | region_model_context *ctxt) | |
4832 | { | |
4833 | const gcall *call_stmt = call_edge.get_call_stmt (); | |
e92d0ff6 | 4834 | update_for_gcall (call_stmt, ctxt, call_edge.get_callee_function ()); |
aef703cf AS |
4835 | } |
4836 | ||
4837 | /* Extract calling information from the return superedge and update the model | |
4838 | for the returning call */ | |
4839 | ||
4840 | void | |
4841 | region_model::update_for_return_superedge (const return_superedge &return_edge, | |
4842 | region_model_context *ctxt) | |
4843 | { | |
4844 | const gcall *call_stmt = return_edge.get_call_stmt (); | |
4845 | update_for_return_gcall (call_stmt, ctxt); | |
4846 | } | |
4847 | ||
bfca9505 DM |
4848 | /* Attempt to to use R to replay SUMMARY into this object. |
4849 | Return true if it is possible. */ | |
757bf1df | 4850 | |
bfca9505 DM |
4851 | bool |
4852 | region_model::replay_call_summary (call_summary_replay &r, | |
4853 | const region_model &summary) | |
757bf1df | 4854 | { |
bfca9505 DM |
4855 | gcc_assert (summary.get_stack_depth () == 1); |
4856 | ||
4857 | m_store.replay_call_summary (r, summary.m_store); | |
757bf1df | 4858 | |
bfca9505 DM |
4859 | if (!m_constraints->replay_call_summary (r, *summary.m_constraints)) |
4860 | return false; | |
4861 | ||
4862 | for (auto kv : summary.m_dynamic_extents) | |
4863 | { | |
4864 | const region *summary_reg = kv.first; | |
4865 | const region *caller_reg = r.convert_region_from_summary (summary_reg); | |
4866 | if (!caller_reg) | |
4867 | continue; | |
4868 | const svalue *summary_sval = kv.second; | |
4869 | const svalue *caller_sval = r.convert_svalue_from_summary (summary_sval); | |
4870 | if (!caller_sval) | |
4871 | continue; | |
4872 | m_dynamic_extents.put (caller_reg, caller_sval); | |
4873 | } | |
4874 | ||
4875 | return true; | |
757bf1df DM |
4876 | } |
4877 | ||
4878 | /* Given a true or false edge guarded by conditional statement COND_STMT, | |
4879 | determine appropriate constraints for the edge to be taken. | |
4880 | ||
4881 | If they are feasible, add the constraints and return true. | |
4882 | ||
4883 | Return false if the constraints contradict existing knowledge | |
84fb3546 DM |
4884 | (and so the edge should not be taken). |
4885 | When returning false, if OUT is non-NULL, write a new rejected_constraint | |
4886 | to it. */ | |
757bf1df DM |
4887 | |
4888 | bool | |
4889 | region_model::apply_constraints_for_gcond (const cfg_superedge &sedge, | |
4890 | const gcond *cond_stmt, | |
84fb3546 DM |
4891 | region_model_context *ctxt, |
4892 | rejected_constraint **out) | |
757bf1df DM |
4893 | { |
4894 | ::edge cfg_edge = sedge.get_cfg_edge (); | |
4895 | gcc_assert (cfg_edge != NULL); | |
4896 | gcc_assert (cfg_edge->flags & (EDGE_TRUE_VALUE | EDGE_FALSE_VALUE)); | |
4897 | ||
4898 | enum tree_code op = gimple_cond_code (cond_stmt); | |
4899 | tree lhs = gimple_cond_lhs (cond_stmt); | |
4900 | tree rhs = gimple_cond_rhs (cond_stmt); | |
4901 | if (cfg_edge->flags & EDGE_FALSE_VALUE) | |
4902 | op = invert_tree_comparison (op, false /* honor_nans */); | |
84fb3546 | 4903 | return add_constraint (lhs, op, rhs, ctxt, out); |
757bf1df DM |
4904 | } |
4905 | ||
ccd4df81 DM |
4906 | /* Return true iff SWITCH_STMT has a non-default label that contains |
4907 | INT_CST. */ | |
4908 | ||
4909 | static bool | |
4910 | has_nondefault_case_for_value_p (const gswitch *switch_stmt, tree int_cst) | |
4911 | { | |
4912 | /* We expect the initial label to be the default; skip it. */ | |
4913 | gcc_assert (CASE_LOW (gimple_switch_label (switch_stmt, 0)) == NULL); | |
4914 | unsigned min_idx = 1; | |
4915 | unsigned max_idx = gimple_switch_num_labels (switch_stmt) - 1; | |
4916 | ||
4917 | /* Binary search: try to find the label containing INT_CST. | |
4918 | This requires the cases to be sorted by CASE_LOW (done by the | |
4919 | gimplifier). */ | |
4920 | while (max_idx >= min_idx) | |
4921 | { | |
4922 | unsigned case_idx = (min_idx + max_idx) / 2; | |
4923 | tree label = gimple_switch_label (switch_stmt, case_idx); | |
4924 | tree low = CASE_LOW (label); | |
4925 | gcc_assert (low); | |
4926 | tree high = CASE_HIGH (label); | |
4927 | if (!high) | |
4928 | high = low; | |
4929 | if (tree_int_cst_compare (int_cst, low) < 0) | |
4930 | { | |
4931 | /* INT_CST is below the range of this label. */ | |
4932 | gcc_assert (case_idx > 0); | |
4933 | max_idx = case_idx - 1; | |
4934 | } | |
4935 | else if (tree_int_cst_compare (int_cst, high) > 0) | |
4936 | { | |
4937 | /* INT_CST is above the range of this case. */ | |
4938 | min_idx = case_idx + 1; | |
4939 | } | |
4940 | else | |
4941 | /* This case contains INT_CST. */ | |
4942 | return true; | |
4943 | } | |
4944 | /* Not found. */ | |
4945 | return false; | |
4946 | } | |
4947 | ||
4948 | /* Return true iff SWITCH_STMT (which must be on an enum value) | |
4949 | has nondefault cases handling all values in the enum. */ | |
4950 | ||
4951 | static bool | |
4952 | has_nondefault_cases_for_all_enum_values_p (const gswitch *switch_stmt) | |
4953 | { | |
4954 | gcc_assert (switch_stmt); | |
4955 | tree type = TREE_TYPE (gimple_switch_index (switch_stmt)); | |
4956 | gcc_assert (TREE_CODE (type) == ENUMERAL_TYPE); | |
4957 | ||
4958 | for (tree enum_val_iter = TYPE_VALUES (type); | |
4959 | enum_val_iter; | |
4960 | enum_val_iter = TREE_CHAIN (enum_val_iter)) | |
4961 | { | |
4962 | tree enum_val = TREE_VALUE (enum_val_iter); | |
4963 | gcc_assert (TREE_CODE (enum_val) == CONST_DECL); | |
4964 | gcc_assert (TREE_CODE (DECL_INITIAL (enum_val)) == INTEGER_CST); | |
4965 | if (!has_nondefault_case_for_value_p (switch_stmt, | |
4966 | DECL_INITIAL (enum_val))) | |
4967 | return false; | |
4968 | } | |
4969 | return true; | |
4970 | } | |
4971 | ||
757bf1df DM |
4972 | /* Given an EDGE guarded by SWITCH_STMT, determine appropriate constraints |
4973 | for the edge to be taken. | |
4974 | ||
4975 | If they are feasible, add the constraints and return true. | |
4976 | ||
4977 | Return false if the constraints contradict existing knowledge | |
84fb3546 DM |
4978 | (and so the edge should not be taken). |
4979 | When returning false, if OUT is non-NULL, write a new rejected_constraint | |
4980 | to it. */ | |
757bf1df DM |
4981 | |
4982 | bool | |
4983 | region_model::apply_constraints_for_gswitch (const switch_cfg_superedge &edge, | |
4984 | const gswitch *switch_stmt, | |
84fb3546 DM |
4985 | region_model_context *ctxt, |
4986 | rejected_constraint **out) | |
757bf1df | 4987 | { |
ccd4df81 DM |
4988 | tree index = gimple_switch_index (switch_stmt); |
4989 | const svalue *index_sval = get_rvalue (index, ctxt); | |
4990 | ||
4991 | /* If we're switching based on an enum type, assume that the user is only | |
4992 | working with values from the enum. Hence if this is an | |
4993 | implicitly-created "default", assume it doesn't get followed. | |
4994 | This fixes numerous "uninitialized" false positives where we otherwise | |
4995 | consider jumping past the initialization cases. */ | |
4996 | ||
4997 | if (/* Don't check during feasibility-checking (when ctxt is NULL). */ | |
4998 | ctxt | |
4999 | /* Must be an enum value. */ | |
5000 | && index_sval->get_type () | |
5001 | && TREE_CODE (TREE_TYPE (index)) == ENUMERAL_TYPE | |
5002 | && TREE_CODE (index_sval->get_type ()) == ENUMERAL_TYPE | |
5003 | /* If we have a constant, then we can check it directly. */ | |
5004 | && index_sval->get_kind () != SK_CONSTANT | |
5005 | && edge.implicitly_created_default_p () | |
5006 | && has_nondefault_cases_for_all_enum_values_p (switch_stmt) | |
5007 | /* Don't do this if there's a chance that the index is | |
5008 | attacker-controlled. */ | |
5009 | && !ctxt->possibly_tainted_p (index_sval)) | |
5010 | { | |
5011 | if (out) | |
5012 | *out = new rejected_default_case (*this); | |
5013 | return false; | |
5014 | } | |
5015 | ||
8ca7fa84 DM |
5016 | bounded_ranges_manager *ranges_mgr = get_range_manager (); |
5017 | const bounded_ranges *all_cases_ranges | |
5018 | = ranges_mgr->get_or_create_ranges_for_switch (&edge, switch_stmt); | |
8ca7fa84 DM |
5019 | bool sat = m_constraints->add_bounded_ranges (index_sval, all_cases_ranges); |
5020 | if (!sat && out) | |
5021 | *out = new rejected_ranges_constraint (*this, index, all_cases_ranges); | |
2c044ff1 DM |
5022 | if (sat && ctxt && !all_cases_ranges->empty_p ()) |
5023 | ctxt->on_bounded_ranges (*index_sval, *all_cases_ranges); | |
8ca7fa84 | 5024 | return sat; |
757bf1df DM |
5025 | } |
5026 | ||
1690a839 DM |
5027 | /* Apply any constraints due to an exception being thrown at LAST_STMT. |
5028 | ||
5029 | If they are feasible, add the constraints and return true. | |
5030 | ||
5031 | Return false if the constraints contradict existing knowledge | |
84fb3546 DM |
5032 | (and so the edge should not be taken). |
5033 | When returning false, if OUT is non-NULL, write a new rejected_constraint | |
5034 | to it. */ | |
1690a839 DM |
5035 | |
5036 | bool | |
5037 | region_model::apply_constraints_for_exception (const gimple *last_stmt, | |
84fb3546 DM |
5038 | region_model_context *ctxt, |
5039 | rejected_constraint **out) | |
1690a839 DM |
5040 | { |
5041 | gcc_assert (last_stmt); | |
5042 | if (const gcall *call = dyn_cast <const gcall *> (last_stmt)) | |
5043 | if (tree callee_fndecl = get_fndecl_for_call (call, ctxt)) | |
5044 | if (is_named_call_p (callee_fndecl, "operator new", call, 1) | |
5045 | || is_named_call_p (callee_fndecl, "operator new []", call, 1)) | |
5046 | { | |
5047 | /* We have an exception thrown from operator new. | |
5048 | Add a constraint that the result was NULL, to avoid a false | |
5049 | leak report due to the result being lost when following | |
5050 | the EH edge. */ | |
5051 | if (tree lhs = gimple_call_lhs (call)) | |
84fb3546 | 5052 | return add_constraint (lhs, EQ_EXPR, null_pointer_node, ctxt, out); |
1690a839 DM |
5053 | return true; |
5054 | } | |
5055 | return true; | |
5056 | } | |
5057 | ||
808f4dfe DM |
5058 | /* For use with push_frame when handling a top-level call within the analysis. |
5059 | PARAM has a defined but unknown initial value. | |
5060 | Anything it points to has escaped, since the calling context "knows" | |
5061 | the pointer, and thus calls to unknown functions could read/write into | |
dcfc7ac9 DM |
5062 | the region. |
5063 | If NONNULL is true, then assume that PARAM must be non-NULL. */ | |
757bf1df DM |
5064 | |
5065 | void | |
808f4dfe | 5066 | region_model::on_top_level_param (tree param, |
dcfc7ac9 DM |
5067 | bool nonnull, |
5068 | region_model_context *ctxt) | |
757bf1df | 5069 | { |
808f4dfe | 5070 | if (POINTER_TYPE_P (TREE_TYPE (param))) |
5eae0ac7 | 5071 | { |
808f4dfe DM |
5072 | const region *param_reg = get_lvalue (param, ctxt); |
5073 | const svalue *init_ptr_sval | |
5074 | = m_mgr->get_or_create_initial_value (param_reg); | |
5075 | const region *pointee_reg = m_mgr->get_symbolic_region (init_ptr_sval); | |
5076 | m_store.mark_as_escaped (pointee_reg); | |
dcfc7ac9 DM |
5077 | if (nonnull) |
5078 | { | |
5079 | const svalue *null_ptr_sval | |
5080 | = m_mgr->get_or_create_null_ptr (TREE_TYPE (param)); | |
5081 | add_constraint (init_ptr_sval, NE_EXPR, null_ptr_sval, ctxt); | |
5082 | } | |
5eae0ac7 | 5083 | } |
757bf1df DM |
5084 | } |
5085 | ||
808f4dfe DM |
5086 | /* Update this region_model to reflect pushing a frame onto the stack |
5087 | for a call to FUN. | |
757bf1df | 5088 | |
808f4dfe DM |
5089 | If ARG_SVALS is non-NULL, use it to populate the parameters |
5090 | in the new frame. | |
5091 | Otherwise, the params have their initial_svalues. | |
757bf1df | 5092 | |
808f4dfe | 5093 | Return the frame_region for the new frame. */ |
757bf1df | 5094 | |
808f4dfe DM |
5095 | const region * |
5096 | region_model::push_frame (function *fun, const vec<const svalue *> *arg_svals, | |
5097 | region_model_context *ctxt) | |
757bf1df | 5098 | { |
808f4dfe DM |
5099 | m_current_frame = m_mgr->get_frame_region (m_current_frame, fun); |
5100 | if (arg_svals) | |
757bf1df | 5101 | { |
808f4dfe DM |
5102 | /* Arguments supplied from a caller frame. */ |
5103 | tree fndecl = fun->decl; | |
5104 | unsigned idx = 0; | |
5105 | for (tree iter_parm = DECL_ARGUMENTS (fndecl); iter_parm; | |
5106 | iter_parm = DECL_CHAIN (iter_parm), ++idx) | |
757bf1df | 5107 | { |
808f4dfe DM |
5108 | /* If there's a mismatching declaration, the call stmt might |
5109 | not have enough args. Handle this case by leaving the | |
5110 | rest of the params as uninitialized. */ | |
5111 | if (idx >= arg_svals->length ()) | |
5112 | break; | |
294b6da2 DM |
5113 | tree parm_lval = iter_parm; |
5114 | if (tree parm_default_ssa = ssa_default_def (fun, iter_parm)) | |
5115 | parm_lval = parm_default_ssa; | |
5116 | const region *parm_reg = get_lvalue (parm_lval, ctxt); | |
808f4dfe | 5117 | const svalue *arg_sval = (*arg_svals)[idx]; |
808f4dfe | 5118 | set_value (parm_reg, arg_sval, ctxt); |
757bf1df | 5119 | } |
2402dc6b DM |
5120 | |
5121 | /* Handle any variadic args. */ | |
5122 | unsigned va_arg_idx = 0; | |
5123 | for (; idx < arg_svals->length (); idx++, va_arg_idx++) | |
5124 | { | |
5125 | const svalue *arg_sval = (*arg_svals)[idx]; | |
5126 | const region *var_arg_reg | |
5127 | = m_mgr->get_var_arg_region (m_current_frame, | |
5128 | va_arg_idx); | |
5129 | set_value (var_arg_reg, arg_sval, ctxt); | |
5130 | } | |
757bf1df | 5131 | } |
808f4dfe | 5132 | else |
757bf1df | 5133 | { |
808f4dfe DM |
5134 | /* Otherwise we have a top-level call within the analysis. The params |
5135 | have defined but unknown initial values. | |
5136 | Anything they point to has escaped. */ | |
5137 | tree fndecl = fun->decl; | |
dcfc7ac9 DM |
5138 | |
5139 | /* Handle "__attribute__((nonnull))". */ | |
5140 | tree fntype = TREE_TYPE (fndecl); | |
5141 | bitmap nonnull_args = get_nonnull_args (fntype); | |
5142 | ||
5143 | unsigned parm_idx = 0; | |
808f4dfe DM |
5144 | for (tree iter_parm = DECL_ARGUMENTS (fndecl); iter_parm; |
5145 | iter_parm = DECL_CHAIN (iter_parm)) | |
757bf1df | 5146 | { |
dcfc7ac9 DM |
5147 | bool non_null = (nonnull_args |
5148 | ? (bitmap_empty_p (nonnull_args) | |
5149 | || bitmap_bit_p (nonnull_args, parm_idx)) | |
5150 | : false); | |
294b6da2 | 5151 | if (tree parm_default_ssa = ssa_default_def (fun, iter_parm)) |
dcfc7ac9 | 5152 | on_top_level_param (parm_default_ssa, non_null, ctxt); |
294b6da2 | 5153 | else |
dcfc7ac9 DM |
5154 | on_top_level_param (iter_parm, non_null, ctxt); |
5155 | parm_idx++; | |
757bf1df | 5156 | } |
dcfc7ac9 DM |
5157 | |
5158 | BITMAP_FREE (nonnull_args); | |
757bf1df | 5159 | } |
757bf1df | 5160 | |
808f4dfe | 5161 | return m_current_frame; |
757bf1df DM |
5162 | } |
5163 | ||
808f4dfe DM |
5164 | /* Get the function of the top-most frame in this region_model's stack. |
5165 | There must be such a frame. */ | |
757bf1df | 5166 | |
808f4dfe DM |
5167 | function * |
5168 | region_model::get_current_function () const | |
757bf1df | 5169 | { |
808f4dfe DM |
5170 | const frame_region *frame = get_current_frame (); |
5171 | gcc_assert (frame); | |
5172 | return frame->get_function (); | |
757bf1df DM |
5173 | } |
5174 | ||
808f4dfe | 5175 | /* Pop the topmost frame_region from this region_model's stack; |
757bf1df | 5176 | |
4cebae09 DM |
5177 | If RESULT_LVALUE is non-null, copy any return value from the frame |
5178 | into the corresponding region (evaluated with respect to the *caller* | |
5179 | frame, rather than the called frame). | |
808f4dfe DM |
5180 | If OUT_RESULT is non-null, copy any return value from the frame |
5181 | into *OUT_RESULT. | |
757bf1df | 5182 | |
430d7d88 DM |
5183 | If EVAL_RETURN_SVALUE is false, then don't evaluate the return value. |
5184 | This is for use when unwinding frames e.g. due to longjmp, to suppress | |
5185 | erroneously reporting uninitialized return values. | |
5186 | ||
808f4dfe DM |
5187 | Purge the frame region and all its descendent regions. |
5188 | Convert any pointers that point into such regions into | |
5189 | POISON_KIND_POPPED_STACK svalues. */ | |
757bf1df | 5190 | |
808f4dfe | 5191 | void |
4cebae09 | 5192 | region_model::pop_frame (tree result_lvalue, |
808f4dfe | 5193 | const svalue **out_result, |
430d7d88 DM |
5194 | region_model_context *ctxt, |
5195 | bool eval_return_svalue) | |
808f4dfe DM |
5196 | { |
5197 | gcc_assert (m_current_frame); | |
757bf1df | 5198 | |
808f4dfe | 5199 | const frame_region *frame_reg = m_current_frame; |
5c6546ca DM |
5200 | |
5201 | /* Notify state machines. */ | |
5202 | if (ctxt) | |
5203 | ctxt->on_pop_frame (frame_reg); | |
5204 | ||
5205 | /* Evaluate the result, within the callee frame. */ | |
808f4dfe DM |
5206 | tree fndecl = m_current_frame->get_function ()->decl; |
5207 | tree result = DECL_RESULT (fndecl); | |
4cebae09 | 5208 | const svalue *retval = NULL; |
430d7d88 DM |
5209 | if (result |
5210 | && TREE_TYPE (result) != void_type_node | |
5211 | && eval_return_svalue) | |
808f4dfe | 5212 | { |
4cebae09 | 5213 | retval = get_rvalue (result, ctxt); |
808f4dfe | 5214 | if (out_result) |
13ad6d9f | 5215 | *out_result = retval; |
808f4dfe | 5216 | } |
757bf1df | 5217 | |
808f4dfe DM |
5218 | /* Pop the frame. */ |
5219 | m_current_frame = m_current_frame->get_calling_frame (); | |
757bf1df | 5220 | |
4cebae09 DM |
5221 | if (result_lvalue && retval) |
5222 | { | |
430d7d88 DM |
5223 | gcc_assert (eval_return_svalue); |
5224 | ||
4cebae09 DM |
5225 | /* Compute result_dst_reg using RESULT_LVALUE *after* popping |
5226 | the frame, but before poisoning pointers into the old frame. */ | |
5227 | const region *result_dst_reg = get_lvalue (result_lvalue, ctxt); | |
5228 | set_value (result_dst_reg, retval, ctxt); | |
5229 | } | |
5230 | ||
808f4dfe | 5231 | unbind_region_and_descendents (frame_reg,POISON_KIND_POPPED_STACK); |
757bf1df DM |
5232 | } |
5233 | ||
808f4dfe | 5234 | /* Get the number of frames in this region_model's stack. */ |
757bf1df | 5235 | |
808f4dfe DM |
5236 | int |
5237 | region_model::get_stack_depth () const | |
757bf1df | 5238 | { |
808f4dfe DM |
5239 | const frame_region *frame = get_current_frame (); |
5240 | if (frame) | |
5241 | return frame->get_stack_depth (); | |
5242 | else | |
5243 | return 0; | |
757bf1df DM |
5244 | } |
5245 | ||
808f4dfe DM |
5246 | /* Get the frame_region with the given index within the stack. |
5247 | The frame_region must exist. */ | |
757bf1df | 5248 | |
808f4dfe DM |
5249 | const frame_region * |
5250 | region_model::get_frame_at_index (int index) const | |
757bf1df | 5251 | { |
808f4dfe DM |
5252 | const frame_region *frame = get_current_frame (); |
5253 | gcc_assert (frame); | |
5254 | gcc_assert (index >= 0); | |
5255 | gcc_assert (index <= frame->get_index ()); | |
5256 | while (index != frame->get_index ()) | |
5257 | { | |
5258 | frame = frame->get_calling_frame (); | |
5259 | gcc_assert (frame); | |
5260 | } | |
5261 | return frame; | |
757bf1df DM |
5262 | } |
5263 | ||
808f4dfe DM |
5264 | /* Unbind svalues for any regions in REG and below. |
5265 | Find any pointers to such regions; convert them to | |
9a2c9579 DM |
5266 | poisoned values of kind PKIND. |
5267 | Also purge any dynamic extents. */ | |
757bf1df | 5268 | |
808f4dfe DM |
5269 | void |
5270 | region_model::unbind_region_and_descendents (const region *reg, | |
5271 | enum poison_kind pkind) | |
757bf1df | 5272 | { |
808f4dfe DM |
5273 | /* Gather a set of base regions to be unbound. */ |
5274 | hash_set<const region *> base_regs; | |
5275 | for (store::cluster_map_t::iterator iter = m_store.begin (); | |
5276 | iter != m_store.end (); ++iter) | |
757bf1df | 5277 | { |
808f4dfe DM |
5278 | const region *iter_base_reg = (*iter).first; |
5279 | if (iter_base_reg->descendent_of_p (reg)) | |
5280 | base_regs.add (iter_base_reg); | |
757bf1df | 5281 | } |
808f4dfe DM |
5282 | for (hash_set<const region *>::iterator iter = base_regs.begin (); |
5283 | iter != base_regs.end (); ++iter) | |
5284 | m_store.purge_cluster (*iter); | |
757bf1df | 5285 | |
808f4dfe DM |
5286 | /* Find any pointers to REG or its descendents; convert to poisoned. */ |
5287 | poison_any_pointers_to_descendents (reg, pkind); | |
9a2c9579 DM |
5288 | |
5289 | /* Purge dynamic extents of any base regions in REG and below | |
5290 | (e.g. VLAs and alloca stack regions). */ | |
5291 | for (auto iter : m_dynamic_extents) | |
5292 | { | |
5293 | const region *iter_reg = iter.first; | |
5294 | if (iter_reg->descendent_of_p (reg)) | |
5295 | unset_dynamic_extents (iter_reg); | |
5296 | } | |
757bf1df DM |
5297 | } |
5298 | ||
808f4dfe DM |
5299 | /* Implementation of BindingVisitor. |
5300 | Update the bound svalues for regions below REG to use poisoned | |
5301 | values instead. */ | |
757bf1df | 5302 | |
808f4dfe | 5303 | struct bad_pointer_finder |
757bf1df | 5304 | { |
808f4dfe DM |
5305 | bad_pointer_finder (const region *reg, enum poison_kind pkind, |
5306 | region_model_manager *mgr) | |
5307 | : m_reg (reg), m_pkind (pkind), m_mgr (mgr), m_count (0) | |
5308 | {} | |
757bf1df | 5309 | |
808f4dfe DM |
5310 | void on_binding (const binding_key *, const svalue *&sval) |
5311 | { | |
5312 | if (const region_svalue *ptr_sval = sval->dyn_cast_region_svalue ()) | |
5313 | { | |
5314 | const region *ptr_dst = ptr_sval->get_pointee (); | |
5315 | /* Poison ptrs to descendents of REG, but not to REG itself, | |
5316 | otherwise double-free detection doesn't work (since sm-state | |
5317 | for "free" is stored on the original ptr svalue). */ | |
5318 | if (ptr_dst->descendent_of_p (m_reg) | |
5319 | && ptr_dst != m_reg) | |
5320 | { | |
5321 | sval = m_mgr->get_or_create_poisoned_svalue (m_pkind, | |
5322 | sval->get_type ()); | |
5323 | ++m_count; | |
5324 | } | |
5325 | } | |
5326 | } | |
757bf1df | 5327 | |
808f4dfe DM |
5328 | const region *m_reg; |
5329 | enum poison_kind m_pkind; | |
5330 | region_model_manager *const m_mgr; | |
5331 | int m_count; | |
5332 | }; | |
757bf1df | 5333 | |
808f4dfe DM |
5334 | /* Find any pointers to REG or its descendents; convert them to |
5335 | poisoned values of kind PKIND. | |
5336 | Return the number of pointers that were poisoned. */ | |
757bf1df | 5337 | |
808f4dfe DM |
5338 | int |
5339 | region_model::poison_any_pointers_to_descendents (const region *reg, | |
5340 | enum poison_kind pkind) | |
5341 | { | |
5342 | bad_pointer_finder bv (reg, pkind, m_mgr); | |
5343 | m_store.for_each_binding (bv); | |
5344 | return bv.m_count; | |
757bf1df DM |
5345 | } |
5346 | ||
808f4dfe DM |
5347 | /* Attempt to merge THIS with OTHER_MODEL, writing the result |
5348 | to OUT_MODEL. Use POINT to distinguish values created as a | |
5349 | result of merging. */ | |
757bf1df | 5350 | |
808f4dfe DM |
5351 | bool |
5352 | region_model::can_merge_with_p (const region_model &other_model, | |
5353 | const program_point &point, | |
f573d351 DM |
5354 | region_model *out_model, |
5355 | const extrinsic_state *ext_state, | |
5356 | const program_state *state_a, | |
5357 | const program_state *state_b) const | |
757bf1df | 5358 | { |
808f4dfe DM |
5359 | gcc_assert (out_model); |
5360 | gcc_assert (m_mgr == other_model.m_mgr); | |
5361 | gcc_assert (m_mgr == out_model->m_mgr); | |
757bf1df | 5362 | |
808f4dfe DM |
5363 | if (m_current_frame != other_model.m_current_frame) |
5364 | return false; | |
5365 | out_model->m_current_frame = m_current_frame; | |
757bf1df | 5366 | |
f573d351 DM |
5367 | model_merger m (this, &other_model, point, out_model, |
5368 | ext_state, state_a, state_b); | |
757bf1df | 5369 | |
808f4dfe DM |
5370 | if (!store::can_merge_p (&m_store, &other_model.m_store, |
5371 | &out_model->m_store, m_mgr->get_store_manager (), | |
5372 | &m)) | |
5373 | return false; | |
5374 | ||
9a2c9579 DM |
5375 | if (!m_dynamic_extents.can_merge_with_p (other_model.m_dynamic_extents, |
5376 | &out_model->m_dynamic_extents)) | |
5377 | return false; | |
5378 | ||
808f4dfe DM |
5379 | /* Merge constraints. */ |
5380 | constraint_manager::merge (*m_constraints, | |
5381 | *other_model.m_constraints, | |
c710051a | 5382 | out_model->m_constraints); |
757bf1df | 5383 | |
808f4dfe | 5384 | return true; |
757bf1df DM |
5385 | } |
5386 | ||
5387 | /* Attempt to get the fndecl used at CALL, if known, or NULL_TREE | |
5388 | otherwise. */ | |
5389 | ||
5390 | tree | |
5391 | region_model::get_fndecl_for_call (const gcall *call, | |
5392 | region_model_context *ctxt) | |
5393 | { | |
5394 | tree fn_ptr = gimple_call_fn (call); | |
5395 | if (fn_ptr == NULL_TREE) | |
5396 | return NULL_TREE; | |
808f4dfe DM |
5397 | const svalue *fn_ptr_sval = get_rvalue (fn_ptr, ctxt); |
5398 | if (const region_svalue *fn_ptr_ptr | |
5399 | = fn_ptr_sval->dyn_cast_region_svalue ()) | |
757bf1df | 5400 | { |
808f4dfe DM |
5401 | const region *reg = fn_ptr_ptr->get_pointee (); |
5402 | if (const function_region *fn_reg = reg->dyn_cast_function_region ()) | |
757bf1df | 5403 | { |
808f4dfe | 5404 | tree fn_decl = fn_reg->get_fndecl (); |
0ba70d1b DM |
5405 | cgraph_node *node = cgraph_node::get (fn_decl); |
5406 | if (!node) | |
5407 | return NULL_TREE; | |
5408 | const cgraph_node *ultimate_node = node->ultimate_alias_target (); | |
91f993b7 DM |
5409 | if (ultimate_node) |
5410 | return ultimate_node->decl; | |
757bf1df DM |
5411 | } |
5412 | } | |
5413 | ||
5414 | return NULL_TREE; | |
5415 | } | |
5416 | ||
808f4dfe | 5417 | /* Would be much simpler to use a lambda here, if it were supported. */ |
757bf1df | 5418 | |
faacafd2 | 5419 | struct append_regions_cb_data |
757bf1df | 5420 | { |
808f4dfe DM |
5421 | const region_model *model; |
5422 | auto_vec<const decl_region *> *out; | |
5423 | }; | |
757bf1df | 5424 | |
faacafd2 | 5425 | /* Populate *OUT with all decl_regions in the current |
808f4dfe | 5426 | frame that have clusters within the store. */ |
757bf1df DM |
5427 | |
5428 | void | |
808f4dfe | 5429 | region_model:: |
faacafd2 | 5430 | get_regions_for_current_frame (auto_vec<const decl_region *> *out) const |
757bf1df | 5431 | { |
faacafd2 | 5432 | append_regions_cb_data data; |
808f4dfe DM |
5433 | data.model = this; |
5434 | data.out = out; | |
faacafd2 | 5435 | m_store.for_each_cluster (append_regions_cb, &data); |
757bf1df DM |
5436 | } |
5437 | ||
faacafd2 | 5438 | /* Implementation detail of get_regions_for_current_frame. */ |
757bf1df | 5439 | |
808f4dfe | 5440 | void |
faacafd2 DM |
5441 | region_model::append_regions_cb (const region *base_reg, |
5442 | append_regions_cb_data *cb_data) | |
757bf1df | 5443 | { |
808f4dfe DM |
5444 | if (base_reg->get_parent_region () != cb_data->model->m_current_frame) |
5445 | return; | |
5446 | if (const decl_region *decl_reg = base_reg->dyn_cast_decl_region ()) | |
faacafd2 | 5447 | cb_data->out->safe_push (decl_reg); |
757bf1df DM |
5448 | } |
5449 | ||
c83e9731 TL |
5450 | |
5451 | /* Abstract class for diagnostics related to the use of | |
5452 | floating-point arithmetic where precision is needed. */ | |
5453 | ||
5454 | class imprecise_floating_point_arithmetic : public pending_diagnostic | |
5455 | { | |
5456 | public: | |
5457 | int get_controlling_option () const final override | |
5458 | { | |
5459 | return OPT_Wanalyzer_imprecise_fp_arithmetic; | |
5460 | } | |
5461 | }; | |
5462 | ||
5463 | /* Concrete diagnostic to complain about uses of floating-point arithmetic | |
5464 | in the size argument of malloc etc. */ | |
5465 | ||
5466 | class float_as_size_arg : public imprecise_floating_point_arithmetic | |
5467 | { | |
5468 | public: | |
5469 | float_as_size_arg (tree arg) : m_arg (arg) | |
5470 | {} | |
5471 | ||
5472 | const char *get_kind () const final override | |
5473 | { | |
5474 | return "float_as_size_arg_diagnostic"; | |
5475 | } | |
5476 | ||
ac9230fb | 5477 | bool subclass_equal_p (const pending_diagnostic &other) const final override |
c83e9731 TL |
5478 | { |
5479 | return same_tree_p (m_arg, ((const float_as_size_arg &) other).m_arg); | |
5480 | } | |
5481 | ||
0e466e97 | 5482 | bool emit (rich_location *rich_loc, logger *) final override |
c83e9731 TL |
5483 | { |
5484 | diagnostic_metadata m; | |
5485 | bool warned = warning_meta (rich_loc, m, get_controlling_option (), | |
5486 | "use of floating-point arithmetic here might" | |
5487 | " yield unexpected results"); | |
5488 | if (warned) | |
5489 | inform (rich_loc->get_loc (), "only use operands of an integer type" | |
5490 | " inside the size argument"); | |
5491 | return warned; | |
5492 | } | |
5493 | ||
5494 | label_text describe_final_event (const evdesc::final_event &ev) final | |
5495 | override | |
5496 | { | |
5497 | if (m_arg) | |
5498 | return ev.formatted_print ("operand %qE is of type %qT", | |
5499 | m_arg, TREE_TYPE (m_arg)); | |
5500 | return ev.formatted_print ("at least one operand of the size argument is" | |
5501 | " of a floating-point type"); | |
5502 | } | |
5503 | ||
5504 | private: | |
5505 | tree m_arg; | |
5506 | }; | |
5507 | ||
5508 | /* Visitor to find uses of floating-point variables/constants in an svalue. */ | |
5509 | ||
5510 | class contains_floating_point_visitor : public visitor | |
5511 | { | |
5512 | public: | |
5513 | contains_floating_point_visitor (const svalue *root_sval) : m_result (NULL) | |
5514 | { | |
5515 | root_sval->accept (this); | |
5516 | } | |
5517 | ||
5518 | const svalue *get_svalue_to_report () | |
5519 | { | |
5520 | return m_result; | |
5521 | } | |
5522 | ||
5523 | void visit_constant_svalue (const constant_svalue *sval) final override | |
5524 | { | |
5525 | /* At the point the analyzer runs, constant integer operands in a floating | |
5526 | point expression are already implictly converted to floating-points. | |
5527 | Thus, we do prefer to report non-constants such that the diagnostic | |
5528 | always reports a floating-point operand. */ | |
5529 | tree type = sval->get_type (); | |
5530 | if (type && FLOAT_TYPE_P (type) && !m_result) | |
5531 | m_result = sval; | |
5532 | } | |
5533 | ||
5534 | void visit_conjured_svalue (const conjured_svalue *sval) final override | |
5535 | { | |
5536 | tree type = sval->get_type (); | |
5537 | if (type && FLOAT_TYPE_P (type)) | |
5538 | m_result = sval; | |
5539 | } | |
5540 | ||
5541 | void visit_initial_svalue (const initial_svalue *sval) final override | |
5542 | { | |
5543 | tree type = sval->get_type (); | |
5544 | if (type && FLOAT_TYPE_P (type)) | |
5545 | m_result = sval; | |
5546 | } | |
5547 | ||
5548 | private: | |
5549 | /* Non-null if at least one floating-point operand was found. */ | |
5550 | const svalue *m_result; | |
5551 | }; | |
5552 | ||
5553 | /* May complain about uses of floating-point operands in SIZE_IN_BYTES. */ | |
5554 | ||
5555 | void | |
5556 | region_model::check_dynamic_size_for_floats (const svalue *size_in_bytes, | |
5557 | region_model_context *ctxt) const | |
5558 | { | |
5559 | gcc_assert (ctxt); | |
5560 | ||
5561 | contains_floating_point_visitor v (size_in_bytes); | |
5562 | if (const svalue *float_sval = v.get_svalue_to_report ()) | |
5563 | { | |
5564 | tree diag_arg = get_representative_tree (float_sval); | |
6341f14e | 5565 | ctxt->warn (make_unique<float_as_size_arg> (diag_arg)); |
c83e9731 TL |
5566 | } |
5567 | } | |
5568 | ||
ce917b04 DM |
5569 | /* Return a region describing a heap-allocated block of memory. |
5570 | Use CTXT to complain about tainted sizes. | |
5571 | ||
5572 | Reuse an existing heap_allocated_region if it's not being referenced by | |
38c00edd EF |
5573 | this region_model; otherwise create a new one. |
5574 | ||
5575 | Optionally (update_state_machine) transitions the pointer pointing to the | |
5576 | heap_allocated_region from start to assumed non-null. */ | |
757bf1df | 5577 | |
808f4dfe | 5578 | const region * |
ce917b04 | 5579 | region_model::get_or_create_region_for_heap_alloc (const svalue *size_in_bytes, |
38c00edd EF |
5580 | region_model_context *ctxt, |
5581 | bool update_state_machine, | |
5582 | const call_details *cd) | |
ce917b04 DM |
5583 | { |
5584 | /* Determine which regions are referenced in this region_model, so that | |
5585 | we can reuse an existing heap_allocated_region if it's not in use on | |
5586 | this path. */ | |
7dc0ecaf | 5587 | auto_bitmap base_regs_in_use; |
ce917b04 | 5588 | get_referenced_base_regions (base_regs_in_use); |
b03a10b0 DM |
5589 | |
5590 | /* Don't reuse regions that are marked as TOUCHED. */ | |
5591 | for (store::cluster_map_t::iterator iter = m_store.begin (); | |
5592 | iter != m_store.end (); ++iter) | |
5593 | if ((*iter).second->touched_p ()) | |
5594 | { | |
5595 | const region *base_reg = (*iter).first; | |
5596 | bitmap_set_bit (base_regs_in_use, base_reg->get_id ()); | |
5597 | } | |
5598 | ||
ce917b04 DM |
5599 | const region *reg |
5600 | = m_mgr->get_or_create_region_for_heap_alloc (base_regs_in_use); | |
688fc162 DM |
5601 | if (size_in_bytes) |
5602 | if (compat_types_p (size_in_bytes->get_type (), size_type_node)) | |
5603 | set_dynamic_extents (reg, size_in_bytes, ctxt); | |
38c00edd EF |
5604 | |
5605 | if (update_state_machine && cd) | |
5606 | { | |
5607 | const svalue *ptr_sval | |
5608 | = m_mgr->get_ptr_svalue (cd->get_lhs_type (), reg); | |
5609 | transition_ptr_sval_non_null (ctxt, ptr_sval); | |
5610 | } | |
5611 | ||
808f4dfe | 5612 | return reg; |
757bf1df DM |
5613 | } |
5614 | ||
ce917b04 DM |
5615 | /* Populate OUT_IDS with the set of IDs of those base regions which are |
5616 | reachable in this region_model. */ | |
5617 | ||
5618 | void | |
7dc0ecaf | 5619 | region_model::get_referenced_base_regions (auto_bitmap &out_ids) const |
ce917b04 DM |
5620 | { |
5621 | reachable_regions reachable_regs (const_cast<region_model *> (this)); | |
5622 | m_store.for_each_cluster (reachable_regions::init_cluster_cb, | |
5623 | &reachable_regs); | |
5624 | /* Get regions for locals that have explicitly bound values. */ | |
5625 | for (store::cluster_map_t::iterator iter = m_store.begin (); | |
5626 | iter != m_store.end (); ++iter) | |
5627 | { | |
5628 | const region *base_reg = (*iter).first; | |
5629 | if (const region *parent = base_reg->get_parent_region ()) | |
5630 | if (parent->get_kind () == RK_FRAME) | |
5631 | reachable_regs.add (base_reg, false); | |
5632 | } | |
5633 | ||
5634 | bitmap_clear (out_ids); | |
5635 | for (auto iter_reg : reachable_regs) | |
5636 | bitmap_set_bit (out_ids, iter_reg->get_id ()); | |
5637 | } | |
5638 | ||
808f4dfe | 5639 | /* Return a new region describing a block of memory allocated within the |
b9365b93 DM |
5640 | current frame. |
5641 | Use CTXT to complain about tainted sizes. */ | |
757bf1df | 5642 | |
808f4dfe | 5643 | const region * |
b9365b93 DM |
5644 | region_model::create_region_for_alloca (const svalue *size_in_bytes, |
5645 | region_model_context *ctxt) | |
757bf1df | 5646 | { |
808f4dfe | 5647 | const region *reg = m_mgr->create_region_for_alloca (m_current_frame); |
ea4e3218 | 5648 | if (compat_types_p (size_in_bytes->get_type (), size_type_node)) |
b9365b93 | 5649 | set_dynamic_extents (reg, size_in_bytes, ctxt); |
808f4dfe | 5650 | return reg; |
757bf1df DM |
5651 | } |
5652 | ||
b9365b93 DM |
5653 | /* Record that the size of REG is SIZE_IN_BYTES. |
5654 | Use CTXT to complain about tainted sizes. */ | |
757bf1df DM |
5655 | |
5656 | void | |
9a2c9579 | 5657 | region_model::set_dynamic_extents (const region *reg, |
b9365b93 DM |
5658 | const svalue *size_in_bytes, |
5659 | region_model_context *ctxt) | |
9a2c9579 DM |
5660 | { |
5661 | assert_compat_types (size_in_bytes->get_type (), size_type_node); | |
b9365b93 | 5662 | if (ctxt) |
c83e9731 TL |
5663 | { |
5664 | check_dynamic_size_for_taint (reg->get_memory_space (), size_in_bytes, | |
5665 | ctxt); | |
5666 | check_dynamic_size_for_floats (size_in_bytes, ctxt); | |
5667 | } | |
9a2c9579 DM |
5668 | m_dynamic_extents.put (reg, size_in_bytes); |
5669 | } | |
5670 | ||
5671 | /* Get the recording of REG in bytes, or NULL if no dynamic size was | |
5672 | recorded. */ | |
5673 | ||
5674 | const svalue * | |
5675 | region_model::get_dynamic_extents (const region *reg) const | |
757bf1df | 5676 | { |
9a2c9579 DM |
5677 | if (const svalue * const *slot = m_dynamic_extents.get (reg)) |
5678 | return *slot; | |
5679 | return NULL; | |
5680 | } | |
5681 | ||
5682 | /* Unset any recorded dynamic size of REG. */ | |
5683 | ||
5684 | void | |
5685 | region_model::unset_dynamic_extents (const region *reg) | |
5686 | { | |
5687 | m_dynamic_extents.remove (reg); | |
757bf1df DM |
5688 | } |
5689 | ||
c81b60b8 DM |
5690 | /* Information of the layout of a RECORD_TYPE, capturing it as a vector |
5691 | of items, where each item is either a field or padding. */ | |
5692 | ||
5693 | class record_layout | |
5694 | { | |
5695 | public: | |
5696 | /* An item within a record; either a field, or padding after a field. */ | |
5697 | struct item | |
5698 | { | |
5699 | public: | |
5700 | item (const bit_range &br, | |
5701 | tree field, | |
5702 | bool is_padding) | |
5703 | : m_bit_range (br), | |
5704 | m_field (field), | |
5705 | m_is_padding (is_padding) | |
5706 | { | |
5707 | } | |
5708 | ||
5709 | bit_offset_t get_start_bit_offset () const | |
5710 | { | |
5711 | return m_bit_range.get_start_bit_offset (); | |
5712 | } | |
5713 | bit_offset_t get_next_bit_offset () const | |
5714 | { | |
5715 | return m_bit_range.get_next_bit_offset (); | |
5716 | } | |
5717 | ||
5718 | bool contains_p (bit_offset_t offset) const | |
5719 | { | |
5720 | return m_bit_range.contains_p (offset); | |
5721 | } | |
5722 | ||
5723 | void dump_to_pp (pretty_printer *pp) const | |
5724 | { | |
5725 | if (m_is_padding) | |
5726 | pp_printf (pp, "padding after %qD", m_field); | |
5727 | else | |
5728 | pp_printf (pp, "%qD", m_field); | |
5729 | pp_string (pp, ", "); | |
5730 | m_bit_range.dump_to_pp (pp); | |
5731 | } | |
5732 | ||
5733 | bit_range m_bit_range; | |
5734 | tree m_field; | |
5735 | bool m_is_padding; | |
5736 | }; | |
5737 | ||
5738 | record_layout (tree record_type) | |
c81b60b8 DM |
5739 | { |
5740 | gcc_assert (TREE_CODE (record_type) == RECORD_TYPE); | |
5741 | ||
5742 | for (tree iter = TYPE_FIELDS (record_type); iter != NULL_TREE; | |
5743 | iter = DECL_CHAIN (iter)) | |
5744 | { | |
5745 | if (TREE_CODE (iter) == FIELD_DECL) | |
5746 | { | |
5747 | int iter_field_offset = int_bit_position (iter); | |
5748 | bit_size_t size_in_bits; | |
5749 | if (!int_size_in_bits (TREE_TYPE (iter), &size_in_bits)) | |
5750 | size_in_bits = 0; | |
5751 | ||
5752 | maybe_pad_to (iter_field_offset); | |
5753 | ||
5754 | /* Add field. */ | |
5755 | m_items.safe_push (item (bit_range (iter_field_offset, | |
5756 | size_in_bits), | |
5757 | iter, false)); | |
5758 | } | |
5759 | } | |
5760 | ||
5761 | /* Add any trailing padding. */ | |
5762 | bit_size_t size_in_bits; | |
5763 | if (int_size_in_bits (record_type, &size_in_bits)) | |
5764 | maybe_pad_to (size_in_bits); | |
5765 | } | |
5766 | ||
5767 | void dump_to_pp (pretty_printer *pp) const | |
5768 | { | |
5769 | unsigned i; | |
5770 | item *it; | |
5771 | FOR_EACH_VEC_ELT (m_items, i, it) | |
5772 | { | |
5773 | it->dump_to_pp (pp); | |
5774 | pp_newline (pp); | |
5775 | } | |
5776 | } | |
5777 | ||
5778 | DEBUG_FUNCTION void dump () const | |
5779 | { | |
5780 | pretty_printer pp; | |
5781 | pp_format_decoder (&pp) = default_tree_printer; | |
5782 | pp.buffer->stream = stderr; | |
5783 | dump_to_pp (&pp); | |
5784 | pp_flush (&pp); | |
5785 | } | |
5786 | ||
5787 | const record_layout::item *get_item_at (bit_offset_t offset) const | |
5788 | { | |
5789 | unsigned i; | |
5790 | item *it; | |
5791 | FOR_EACH_VEC_ELT (m_items, i, it) | |
5792 | if (it->contains_p (offset)) | |
5793 | return it; | |
5794 | return NULL; | |
5795 | } | |
5796 | ||
5797 | private: | |
5798 | /* Subroutine of ctor. Add padding item to NEXT_OFFSET if necessary. */ | |
5799 | ||
5800 | void maybe_pad_to (bit_offset_t next_offset) | |
5801 | { | |
5802 | if (m_items.length () > 0) | |
5803 | { | |
5804 | const item &last_item = m_items[m_items.length () - 1]; | |
5805 | bit_offset_t offset_after_last_item | |
5806 | = last_item.get_next_bit_offset (); | |
5807 | if (next_offset > offset_after_last_item) | |
5808 | { | |
5809 | bit_size_t padding_size | |
5810 | = next_offset - offset_after_last_item; | |
5811 | m_items.safe_push (item (bit_range (offset_after_last_item, | |
5812 | padding_size), | |
5813 | last_item.m_field, true)); | |
5814 | } | |
5815 | } | |
5816 | } | |
5817 | ||
c81b60b8 DM |
5818 | auto_vec<item> m_items; |
5819 | }; | |
5820 | ||
5821 | /* A subclass of pending_diagnostic for complaining about uninitialized data | |
5822 | being copied across a trust boundary to an untrusted output | |
5823 | (e.g. copy_to_user infoleaks in the Linux kernel). */ | |
5824 | ||
5825 | class exposure_through_uninit_copy | |
5826 | : public pending_diagnostic_subclass<exposure_through_uninit_copy> | |
5827 | { | |
5828 | public: | |
5829 | exposure_through_uninit_copy (const region *src_region, | |
5830 | const region *dest_region, | |
ffaeb9dc | 5831 | const svalue *copied_sval) |
c81b60b8 DM |
5832 | : m_src_region (src_region), |
5833 | m_dest_region (dest_region), | |
ffaeb9dc | 5834 | m_copied_sval (copied_sval) |
c81b60b8 DM |
5835 | { |
5836 | gcc_assert (m_copied_sval->get_kind () == SK_POISONED | |
5837 | || m_copied_sval->get_kind () == SK_COMPOUND); | |
5838 | } | |
5839 | ||
5840 | const char *get_kind () const final override | |
5841 | { | |
5842 | return "exposure_through_uninit_copy"; | |
5843 | } | |
5844 | ||
5845 | bool operator== (const exposure_through_uninit_copy &other) const | |
5846 | { | |
5847 | return (m_src_region == other.m_src_region | |
5848 | && m_dest_region == other.m_dest_region | |
5849 | && m_copied_sval == other.m_copied_sval); | |
5850 | } | |
5851 | ||
5852 | int get_controlling_option () const final override | |
5853 | { | |
5854 | return OPT_Wanalyzer_exposure_through_uninit_copy; | |
5855 | } | |
5856 | ||
0e466e97 | 5857 | bool emit (rich_location *rich_loc, logger *) final override |
c81b60b8 DM |
5858 | { |
5859 | diagnostic_metadata m; | |
5860 | /* CWE-200: Exposure of Sensitive Information to an Unauthorized Actor. */ | |
5861 | m.add_cwe (200); | |
5862 | enum memory_space mem_space = get_src_memory_space (); | |
5863 | bool warned; | |
5864 | switch (mem_space) | |
5865 | { | |
5866 | default: | |
5867 | warned = warning_meta | |
5868 | (rich_loc, m, get_controlling_option (), | |
5869 | "potential exposure of sensitive information" | |
5870 | " by copying uninitialized data across trust boundary"); | |
5871 | break; | |
5872 | case MEMSPACE_STACK: | |
5873 | warned = warning_meta | |
5874 | (rich_loc, m, get_controlling_option (), | |
5875 | "potential exposure of sensitive information" | |
5876 | " by copying uninitialized data from stack across trust boundary"); | |
5877 | break; | |
5878 | case MEMSPACE_HEAP: | |
5879 | warned = warning_meta | |
5880 | (rich_loc, m, get_controlling_option (), | |
5881 | "potential exposure of sensitive information" | |
5882 | " by copying uninitialized data from heap across trust boundary"); | |
5883 | break; | |
5884 | } | |
5885 | if (warned) | |
5886 | { | |
5887 | location_t loc = rich_loc->get_loc (); | |
5888 | inform_number_of_uninit_bits (loc); | |
5889 | complain_about_uninit_ranges (loc); | |
5890 | ||
5891 | if (mem_space == MEMSPACE_STACK) | |
5892 | maybe_emit_fixit_hint (); | |
5893 | } | |
5894 | return warned; | |
5895 | } | |
5896 | ||
5897 | label_text describe_final_event (const evdesc::final_event &) final override | |
5898 | { | |
5899 | enum memory_space mem_space = get_src_memory_space (); | |
5900 | switch (mem_space) | |
5901 | { | |
5902 | default: | |
5903 | return label_text::borrow ("uninitialized data copied here"); | |
5904 | ||
5905 | case MEMSPACE_STACK: | |
5906 | return label_text::borrow ("uninitialized data copied from stack here"); | |
5907 | ||
5908 | case MEMSPACE_HEAP: | |
5909 | return label_text::borrow ("uninitialized data copied from heap here"); | |
5910 | } | |
5911 | } | |
5912 | ||
5913 | void mark_interesting_stuff (interesting_t *interest) final override | |
5914 | { | |
5915 | if (m_src_region) | |
5916 | interest->add_region_creation (m_src_region); | |
5917 | } | |
5918 | ||
5919 | private: | |
5920 | enum memory_space get_src_memory_space () const | |
5921 | { | |
5922 | return m_src_region ? m_src_region->get_memory_space () : MEMSPACE_UNKNOWN; | |
5923 | } | |
5924 | ||
5925 | bit_size_t calc_num_uninit_bits () const | |
5926 | { | |
5927 | switch (m_copied_sval->get_kind ()) | |
5928 | { | |
5929 | default: | |
5930 | gcc_unreachable (); | |
5931 | break; | |
5932 | case SK_POISONED: | |
5933 | { | |
5934 | const poisoned_svalue *poisoned_sval | |
5935 | = as_a <const poisoned_svalue *> (m_copied_sval); | |
5936 | gcc_assert (poisoned_sval->get_poison_kind () == POISON_KIND_UNINIT); | |
5937 | ||
5938 | /* Give up if don't have type information. */ | |
5939 | if (m_copied_sval->get_type () == NULL_TREE) | |
5940 | return 0; | |
5941 | ||
5942 | bit_size_t size_in_bits; | |
5943 | if (int_size_in_bits (m_copied_sval->get_type (), &size_in_bits)) | |
5944 | return size_in_bits; | |
5945 | ||
5946 | /* Give up if we can't get the size of the type. */ | |
5947 | return 0; | |
5948 | } | |
5949 | break; | |
5950 | case SK_COMPOUND: | |
5951 | { | |
5952 | const compound_svalue *compound_sval | |
5953 | = as_a <const compound_svalue *> (m_copied_sval); | |
5954 | bit_size_t result = 0; | |
5955 | /* Find keys for uninit svals. */ | |
5956 | for (auto iter : *compound_sval) | |
5957 | { | |
5958 | const svalue *sval = iter.second; | |
5959 | if (const poisoned_svalue *psval | |
5960 | = sval->dyn_cast_poisoned_svalue ()) | |
5961 | if (psval->get_poison_kind () == POISON_KIND_UNINIT) | |
5962 | { | |
5963 | const binding_key *key = iter.first; | |
5964 | const concrete_binding *ckey | |
5965 | = key->dyn_cast_concrete_binding (); | |
5966 | gcc_assert (ckey); | |
5967 | result += ckey->get_size_in_bits (); | |
5968 | } | |
5969 | } | |
5970 | return result; | |
5971 | } | |
5972 | } | |
5973 | } | |
5974 | ||
5975 | void inform_number_of_uninit_bits (location_t loc) const | |
5976 | { | |
5977 | bit_size_t num_uninit_bits = calc_num_uninit_bits (); | |
5978 | if (num_uninit_bits <= 0) | |
5979 | return; | |
5980 | if (num_uninit_bits % BITS_PER_UNIT == 0) | |
5981 | { | |
5982 | /* Express in bytes. */ | |
5983 | byte_size_t num_uninit_bytes = num_uninit_bits / BITS_PER_UNIT; | |
5984 | if (num_uninit_bytes == 1) | |
5985 | inform (loc, "1 byte is uninitialized"); | |
5986 | else | |
5987 | inform (loc, | |
5988 | "%wu bytes are uninitialized", num_uninit_bytes.to_uhwi ()); | |
5989 | } | |
5990 | else | |
5991 | { | |
5992 | /* Express in bits. */ | |
5993 | if (num_uninit_bits == 1) | |
5994 | inform (loc, "1 bit is uninitialized"); | |
5995 | else | |
5996 | inform (loc, | |
5997 | "%wu bits are uninitialized", num_uninit_bits.to_uhwi ()); | |
5998 | } | |
5999 | } | |
6000 | ||
6001 | void complain_about_uninit_ranges (location_t loc) const | |
6002 | { | |
6003 | if (const compound_svalue *compound_sval | |
6004 | = m_copied_sval->dyn_cast_compound_svalue ()) | |
6005 | { | |
6006 | /* Find keys for uninit svals. */ | |
6007 | auto_vec<const concrete_binding *> uninit_keys; | |
6008 | for (auto iter : *compound_sval) | |
6009 | { | |
6010 | const svalue *sval = iter.second; | |
6011 | if (const poisoned_svalue *psval | |
6012 | = sval->dyn_cast_poisoned_svalue ()) | |
6013 | if (psval->get_poison_kind () == POISON_KIND_UNINIT) | |
6014 | { | |
6015 | const binding_key *key = iter.first; | |
6016 | const concrete_binding *ckey | |
6017 | = key->dyn_cast_concrete_binding (); | |
6018 | gcc_assert (ckey); | |
6019 | uninit_keys.safe_push (ckey); | |
6020 | } | |
6021 | } | |
6022 | /* Complain about them in sorted order. */ | |
6023 | uninit_keys.qsort (concrete_binding::cmp_ptr_ptr); | |
6024 | ||
6025 | std::unique_ptr<record_layout> layout; | |
6026 | ||
6027 | tree type = m_copied_sval->get_type (); | |
6028 | if (type && TREE_CODE (type) == RECORD_TYPE) | |
6029 | { | |
6030 | // (std::make_unique is C++14) | |
6031 | layout = std::unique_ptr<record_layout> (new record_layout (type)); | |
6032 | ||
6033 | if (0) | |
6034 | layout->dump (); | |
6035 | } | |
6036 | ||
6037 | unsigned i; | |
6038 | const concrete_binding *ckey; | |
6039 | FOR_EACH_VEC_ELT (uninit_keys, i, ckey) | |
6040 | { | |
6041 | bit_offset_t start_bit = ckey->get_start_bit_offset (); | |
6042 | bit_offset_t next_bit = ckey->get_next_bit_offset (); | |
6043 | complain_about_uninit_range (loc, start_bit, next_bit, | |
6044 | layout.get ()); | |
6045 | } | |
6046 | } | |
6047 | } | |
6048 | ||
6049 | void complain_about_uninit_range (location_t loc, | |
6050 | bit_offset_t start_bit, | |
6051 | bit_offset_t next_bit, | |
6052 | const record_layout *layout) const | |
6053 | { | |
6054 | if (layout) | |
6055 | { | |
6056 | while (start_bit < next_bit) | |
6057 | { | |
6058 | if (const record_layout::item *item | |
6059 | = layout->get_item_at (start_bit)) | |
6060 | { | |
6061 | gcc_assert (start_bit >= item->get_start_bit_offset ()); | |
6062 | gcc_assert (start_bit < item->get_next_bit_offset ()); | |
6063 | if (item->get_start_bit_offset () == start_bit | |
6064 | && item->get_next_bit_offset () <= next_bit) | |
6065 | complain_about_fully_uninit_item (*item); | |
6066 | else | |
6067 | complain_about_partially_uninit_item (*item); | |
6068 | start_bit = item->get_next_bit_offset (); | |
6069 | continue; | |
6070 | } | |
6071 | else | |
6072 | break; | |
6073 | } | |
6074 | } | |
6075 | ||
6076 | if (start_bit >= next_bit) | |
6077 | return; | |
6078 | ||
6079 | if (start_bit % 8 == 0 && next_bit % 8 == 0) | |
6080 | { | |
6081 | /* Express in bytes. */ | |
6082 | byte_offset_t start_byte = start_bit / 8; | |
6083 | byte_offset_t last_byte = (next_bit / 8) - 1; | |
6084 | if (last_byte == start_byte) | |
6085 | inform (loc, | |
6086 | "byte %wu is uninitialized", | |
6087 | start_byte.to_uhwi ()); | |
6088 | else | |
6089 | inform (loc, | |
6090 | "bytes %wu - %wu are uninitialized", | |
6091 | start_byte.to_uhwi (), | |
6092 | last_byte.to_uhwi ()); | |
6093 | } | |
6094 | else | |
6095 | { | |
6096 | /* Express in bits. */ | |
6097 | bit_offset_t last_bit = next_bit - 1; | |
6098 | if (last_bit == start_bit) | |
6099 | inform (loc, | |
6100 | "bit %wu is uninitialized", | |
6101 | start_bit.to_uhwi ()); | |
6102 | else | |
6103 | inform (loc, | |
6104 | "bits %wu - %wu are uninitialized", | |
6105 | start_bit.to_uhwi (), | |
6106 | last_bit.to_uhwi ()); | |
6107 | } | |
6108 | } | |
6109 | ||
6110 | static void | |
6111 | complain_about_fully_uninit_item (const record_layout::item &item) | |
6112 | { | |
6113 | tree field = item.m_field; | |
6114 | bit_size_t num_bits = item.m_bit_range.m_size_in_bits; | |
6115 | if (item.m_is_padding) | |
6116 | { | |
6117 | if (num_bits % 8 == 0) | |
6118 | { | |
6119 | /* Express in bytes. */ | |
6120 | byte_size_t num_bytes = num_bits / BITS_PER_UNIT; | |
6121 | if (num_bytes == 1) | |
6122 | inform (DECL_SOURCE_LOCATION (field), | |
6123 | "padding after field %qD is uninitialized (1 byte)", | |
6124 | field); | |
6125 | else | |
6126 | inform (DECL_SOURCE_LOCATION (field), | |
6127 | "padding after field %qD is uninitialized (%wu bytes)", | |
6128 | field, num_bytes.to_uhwi ()); | |
6129 | } | |
6130 | else | |
6131 | { | |
6132 | /* Express in bits. */ | |
6133 | if (num_bits == 1) | |
6134 | inform (DECL_SOURCE_LOCATION (field), | |
6135 | "padding after field %qD is uninitialized (1 bit)", | |
6136 | field); | |
6137 | else | |
6138 | inform (DECL_SOURCE_LOCATION (field), | |
6139 | "padding after field %qD is uninitialized (%wu bits)", | |
6140 | field, num_bits.to_uhwi ()); | |
6141 | } | |
6142 | } | |
6143 | else | |
6144 | { | |
6145 | if (num_bits % 8 == 0) | |
6146 | { | |
6147 | /* Express in bytes. */ | |
6148 | byte_size_t num_bytes = num_bits / BITS_PER_UNIT; | |
6149 | if (num_bytes == 1) | |
6150 | inform (DECL_SOURCE_LOCATION (field), | |
6151 | "field %qD is uninitialized (1 byte)", field); | |
6152 | else | |
6153 | inform (DECL_SOURCE_LOCATION (field), | |
6154 | "field %qD is uninitialized (%wu bytes)", | |
6155 | field, num_bytes.to_uhwi ()); | |
6156 | } | |
6157 | else | |
6158 | { | |
6159 | /* Express in bits. */ | |
6160 | if (num_bits == 1) | |
6161 | inform (DECL_SOURCE_LOCATION (field), | |
6162 | "field %qD is uninitialized (1 bit)", field); | |
6163 | else | |
6164 | inform (DECL_SOURCE_LOCATION (field), | |
6165 | "field %qD is uninitialized (%wu bits)", | |
6166 | field, num_bits.to_uhwi ()); | |
6167 | } | |
6168 | } | |
6169 | } | |
6170 | ||
6171 | static void | |
6172 | complain_about_partially_uninit_item (const record_layout::item &item) | |
6173 | { | |
6174 | tree field = item.m_field; | |
6175 | if (item.m_is_padding) | |
6176 | inform (DECL_SOURCE_LOCATION (field), | |
6177 | "padding after field %qD is partially uninitialized", | |
6178 | field); | |
6179 | else | |
6180 | inform (DECL_SOURCE_LOCATION (field), | |
6181 | "field %qD is partially uninitialized", | |
6182 | field); | |
6183 | /* TODO: ideally we'd describe what parts are uninitialized. */ | |
6184 | } | |
6185 | ||
6186 | void maybe_emit_fixit_hint () const | |
6187 | { | |
6188 | if (tree decl = m_src_region->maybe_get_decl ()) | |
6189 | { | |
6190 | gcc_rich_location hint_richloc (DECL_SOURCE_LOCATION (decl)); | |
6191 | hint_richloc.add_fixit_insert_after (" = {0}"); | |
6192 | inform (&hint_richloc, | |
6193 | "suggest forcing zero-initialization by" | |
6194 | " providing a %<{0}%> initializer"); | |
6195 | } | |
6196 | } | |
6197 | ||
6198 | private: | |
6199 | const region *m_src_region; | |
6200 | const region *m_dest_region; | |
6201 | const svalue *m_copied_sval; | |
c81b60b8 DM |
6202 | }; |
6203 | ||
6204 | /* Return true if any part of SVAL is uninitialized. */ | |
6205 | ||
6206 | static bool | |
6207 | contains_uninit_p (const svalue *sval) | |
6208 | { | |
6209 | struct uninit_finder : public visitor | |
6210 | { | |
6211 | public: | |
6212 | uninit_finder () : m_found_uninit (false) {} | |
6213 | void visit_poisoned_svalue (const poisoned_svalue *sval) | |
6214 | { | |
6215 | if (sval->get_poison_kind () == POISON_KIND_UNINIT) | |
6216 | m_found_uninit = true; | |
6217 | } | |
6218 | bool m_found_uninit; | |
6219 | }; | |
6220 | ||
6221 | uninit_finder v; | |
6222 | sval->accept (&v); | |
6223 | ||
6224 | return v.m_found_uninit; | |
6225 | } | |
6226 | ||
6227 | /* Function for use by plugins when simulating writing data through a | |
6228 | pointer to an "untrusted" region DST_REG (and thus crossing a security | |
6229 | boundary), such as copying data to user space in an OS kernel. | |
6230 | ||
6231 | Check that COPIED_SVAL is fully initialized. If not, complain about | |
6232 | an infoleak to CTXT. | |
6233 | ||
6234 | SRC_REG can be NULL; if non-NULL it is used as a hint in the diagnostic | |
6235 | as to where COPIED_SVAL came from. */ | |
6236 | ||
6237 | void | |
6238 | region_model::maybe_complain_about_infoleak (const region *dst_reg, | |
6239 | const svalue *copied_sval, | |
6240 | const region *src_reg, | |
6241 | region_model_context *ctxt) | |
6242 | { | |
6243 | /* Check for exposure. */ | |
6244 | if (contains_uninit_p (copied_sval)) | |
6341f14e DM |
6245 | ctxt->warn (make_unique<exposure_through_uninit_copy> (src_reg, |
6246 | dst_reg, | |
6247 | copied_sval)); | |
c81b60b8 DM |
6248 | } |
6249 | ||
3d2d04cd DM |
6250 | /* Set errno to a positive symbolic int, as if some error has occurred. */ |
6251 | ||
6252 | void | |
6253 | region_model::set_errno (const call_details &cd) | |
6254 | { | |
6255 | const region *errno_reg = m_mgr->get_errno_region (); | |
6256 | conjured_purge p (this, cd.get_ctxt ()); | |
6257 | const svalue *new_errno_sval | |
6258 | = m_mgr->get_or_create_conjured_svalue (integer_type_node, | |
6259 | cd.get_call_stmt (), | |
6260 | errno_reg, p); | |
6261 | const svalue *zero | |
6262 | = m_mgr->get_or_create_int_cst (integer_type_node, 0); | |
6263 | add_constraint (new_errno_sval, GT_EXPR, zero, cd.get_ctxt ()); | |
6264 | set_value (errno_reg, new_errno_sval, cd.get_ctxt ()); | |
6265 | } | |
6266 | ||
eafa9d96 DM |
6267 | /* class noop_region_model_context : public region_model_context. */ |
6268 | ||
c65d3c7f | 6269 | void |
6341f14e | 6270 | noop_region_model_context::add_note (std::unique_ptr<pending_note>) |
c65d3c7f | 6271 | { |
c65d3c7f DM |
6272 | } |
6273 | ||
2503dd59 DM |
6274 | void |
6275 | noop_region_model_context::add_event (std::unique_ptr<checker_event>) | |
6276 | { | |
6277 | } | |
6278 | ||
eafa9d96 | 6279 | void |
accece8c | 6280 | noop_region_model_context::bifurcate (std::unique_ptr<custom_edge_info>) |
eafa9d96 | 6281 | { |
eafa9d96 DM |
6282 | } |
6283 | ||
6284 | void | |
6285 | noop_region_model_context::terminate_path () | |
6286 | { | |
6287 | } | |
6288 | ||
2503dd59 DM |
6289 | /* class region_model_context_decorator : public region_model_context. */ |
6290 | ||
6291 | void | |
6292 | region_model_context_decorator::add_event (std::unique_ptr<checker_event> event) | |
6293 | { | |
1e7b0a5d DM |
6294 | if (m_inner) |
6295 | m_inner->add_event (std::move (event)); | |
2503dd59 DM |
6296 | } |
6297 | ||
808f4dfe | 6298 | /* struct model_merger. */ |
757bf1df | 6299 | |
808f4dfe | 6300 | /* Dump a multiline representation of this merger to PP. */ |
757bf1df DM |
6301 | |
6302 | void | |
808f4dfe | 6303 | model_merger::dump_to_pp (pretty_printer *pp, bool simple) const |
757bf1df | 6304 | { |
808f4dfe DM |
6305 | pp_string (pp, "model A:"); |
6306 | pp_newline (pp); | |
6307 | m_model_a->dump_to_pp (pp, simple, true); | |
6308 | pp_newline (pp); | |
757bf1df | 6309 | |
808f4dfe | 6310 | pp_string (pp, "model B:"); |
757bf1df | 6311 | pp_newline (pp); |
808f4dfe | 6312 | m_model_b->dump_to_pp (pp, simple, true); |
757bf1df DM |
6313 | pp_newline (pp); |
6314 | ||
808f4dfe | 6315 | pp_string (pp, "merged model:"); |
757bf1df | 6316 | pp_newline (pp); |
808f4dfe | 6317 | m_merged_model->dump_to_pp (pp, simple, true); |
757bf1df DM |
6318 | pp_newline (pp); |
6319 | } | |
6320 | ||
808f4dfe | 6321 | /* Dump a multiline representation of this merger to FILE. */ |
757bf1df DM |
6322 | |
6323 | void | |
808f4dfe | 6324 | model_merger::dump (FILE *fp, bool simple) const |
757bf1df DM |
6325 | { |
6326 | pretty_printer pp; | |
6327 | pp_format_decoder (&pp) = default_tree_printer; | |
6328 | pp_show_color (&pp) = pp_show_color (global_dc->printer); | |
6329 | pp.buffer->stream = fp; | |
808f4dfe | 6330 | dump_to_pp (&pp, simple); |
757bf1df DM |
6331 | pp_flush (&pp); |
6332 | } | |
6333 | ||
808f4dfe | 6334 | /* Dump a multiline representation of this merger to stderr. */ |
757bf1df DM |
6335 | |
6336 | DEBUG_FUNCTION void | |
808f4dfe | 6337 | model_merger::dump (bool simple) const |
757bf1df | 6338 | { |
808f4dfe | 6339 | dump (stderr, simple); |
757bf1df DM |
6340 | } |
6341 | ||
f573d351 DM |
6342 | /* Return true if it's OK to merge SVAL with other svalues. */ |
6343 | ||
6344 | bool | |
6345 | model_merger::mergeable_svalue_p (const svalue *sval) const | |
6346 | { | |
6347 | if (m_ext_state) | |
6348 | { | |
6349 | /* Reject merging svalues that have non-purgable sm-state, | |
6350 | to avoid falsely reporting memory leaks by merging them | |
6351 | with something else. For example, given a local var "p", | |
6352 | reject the merger of a: | |
6353 | store_a mapping "p" to a malloc-ed ptr | |
6354 | with: | |
6355 | store_b mapping "p" to a NULL ptr. */ | |
6356 | if (m_state_a) | |
6357 | if (!m_state_a->can_purge_p (*m_ext_state, sval)) | |
6358 | return false; | |
6359 | if (m_state_b) | |
6360 | if (!m_state_b->can_purge_p (*m_ext_state, sval)) | |
6361 | return false; | |
6362 | } | |
6363 | return true; | |
6364 | } | |
6365 | ||
75038aa6 DM |
6366 | } // namespace ana |
6367 | ||
808f4dfe | 6368 | /* Dump RMODEL fully to stderr (i.e. without summarization). */ |
757bf1df | 6369 | |
808f4dfe DM |
6370 | DEBUG_FUNCTION void |
6371 | debug (const region_model &rmodel) | |
757bf1df | 6372 | { |
808f4dfe | 6373 | rmodel.dump (false); |
757bf1df DM |
6374 | } |
6375 | ||
8ca7fa84 | 6376 | /* class rejected_op_constraint : public rejected_constraint. */ |
84fb3546 DM |
6377 | |
6378 | void | |
8ca7fa84 | 6379 | rejected_op_constraint::dump_to_pp (pretty_printer *pp) const |
84fb3546 DM |
6380 | { |
6381 | region_model m (m_model); | |
6382 | const svalue *lhs_sval = m.get_rvalue (m_lhs, NULL); | |
6383 | const svalue *rhs_sval = m.get_rvalue (m_rhs, NULL); | |
6384 | lhs_sval->dump_to_pp (pp, true); | |
6385 | pp_printf (pp, " %s ", op_symbol_code (m_op)); | |
6386 | rhs_sval->dump_to_pp (pp, true); | |
6387 | } | |
6388 | ||
ccd4df81 DM |
6389 | /* class rejected_default_case : public rejected_constraint. */ |
6390 | ||
6391 | void | |
6392 | rejected_default_case::dump_to_pp (pretty_printer *pp) const | |
6393 | { | |
6394 | pp_string (pp, "implicit default for enum"); | |
6395 | } | |
6396 | ||
8ca7fa84 DM |
6397 | /* class rejected_ranges_constraint : public rejected_constraint. */ |
6398 | ||
6399 | void | |
6400 | rejected_ranges_constraint::dump_to_pp (pretty_printer *pp) const | |
6401 | { | |
6402 | region_model m (m_model); | |
6403 | const svalue *sval = m.get_rvalue (m_expr, NULL); | |
6404 | sval->dump_to_pp (pp, true); | |
6405 | pp_string (pp, " in "); | |
6406 | m_ranges->dump_to_pp (pp, true); | |
6407 | } | |
6408 | ||
808f4dfe | 6409 | /* class engine. */ |
757bf1df | 6410 | |
11a2ff8d DM |
6411 | /* engine's ctor. */ |
6412 | ||
4cebae09 DM |
6413 | engine::engine (const supergraph *sg, logger *logger) |
6414 | : m_sg (sg), m_mgr (logger) | |
11a2ff8d DM |
6415 | { |
6416 | } | |
6417 | ||
808f4dfe | 6418 | /* Dump the managed objects by class to LOGGER, and the per-class totals. */ |
757bf1df | 6419 | |
808f4dfe DM |
6420 | void |
6421 | engine::log_stats (logger *logger) const | |
757bf1df | 6422 | { |
808f4dfe | 6423 | m_mgr.log_stats (logger, true); |
757bf1df DM |
6424 | } |
6425 | ||
75038aa6 DM |
6426 | namespace ana { |
6427 | ||
757bf1df DM |
6428 | #if CHECKING_P |
6429 | ||
6430 | namespace selftest { | |
6431 | ||
8c08c983 DM |
6432 | /* Build a constant tree of the given type from STR. */ |
6433 | ||
6434 | static tree | |
6435 | build_real_cst_from_string (tree type, const char *str) | |
6436 | { | |
6437 | REAL_VALUE_TYPE real; | |
6438 | real_from_string (&real, str); | |
6439 | return build_real (type, real); | |
6440 | } | |
6441 | ||
6442 | /* Append various "interesting" constants to OUT (e.g. NaN). */ | |
6443 | ||
6444 | static void | |
6445 | append_interesting_constants (auto_vec<tree> *out) | |
6446 | { | |
6447 | out->safe_push (build_int_cst (integer_type_node, 0)); | |
6448 | out->safe_push (build_int_cst (integer_type_node, 42)); | |
6449 | out->safe_push (build_int_cst (unsigned_type_node, 0)); | |
6450 | out->safe_push (build_int_cst (unsigned_type_node, 42)); | |
6451 | out->safe_push (build_real_cst_from_string (float_type_node, "QNaN")); | |
6452 | out->safe_push (build_real_cst_from_string (float_type_node, "-QNaN")); | |
6453 | out->safe_push (build_real_cst_from_string (float_type_node, "SNaN")); | |
6454 | out->safe_push (build_real_cst_from_string (float_type_node, "-SNaN")); | |
6455 | out->safe_push (build_real_cst_from_string (float_type_node, "0.0")); | |
6456 | out->safe_push (build_real_cst_from_string (float_type_node, "-0.0")); | |
6457 | out->safe_push (build_real_cst_from_string (float_type_node, "Inf")); | |
6458 | out->safe_push (build_real_cst_from_string (float_type_node, "-Inf")); | |
6459 | } | |
6460 | ||
6461 | /* Verify that tree_cmp is a well-behaved comparator for qsort, even | |
6462 | if the underlying constants aren't comparable. */ | |
6463 | ||
6464 | static void | |
6465 | test_tree_cmp_on_constants () | |
6466 | { | |
6467 | auto_vec<tree> csts; | |
6468 | append_interesting_constants (&csts); | |
6469 | ||
6470 | /* Try sorting every triple. */ | |
6471 | const unsigned num = csts.length (); | |
6472 | for (unsigned i = 0; i < num; i++) | |
6473 | for (unsigned j = 0; j < num; j++) | |
6474 | for (unsigned k = 0; k < num; k++) | |
6475 | { | |
6476 | auto_vec<tree> v (3); | |
6477 | v.quick_push (csts[i]); | |
6478 | v.quick_push (csts[j]); | |
6479 | v.quick_push (csts[k]); | |
6480 | v.qsort (tree_cmp); | |
6481 | } | |
6482 | } | |
6483 | ||
757bf1df DM |
6484 | /* Implementation detail of the ASSERT_CONDITION_* macros. */ |
6485 | ||
808f4dfe DM |
6486 | void |
6487 | assert_condition (const location &loc, | |
6488 | region_model &model, | |
6489 | const svalue *lhs, tree_code op, const svalue *rhs, | |
6490 | tristate expected) | |
6491 | { | |
6492 | tristate actual = model.eval_condition (lhs, op, rhs); | |
6493 | ASSERT_EQ_AT (loc, actual, expected); | |
6494 | } | |
6495 | ||
6496 | /* Implementation detail of the ASSERT_CONDITION_* macros. */ | |
6497 | ||
757bf1df DM |
6498 | void |
6499 | assert_condition (const location &loc, | |
6500 | region_model &model, | |
6501 | tree lhs, tree_code op, tree rhs, | |
6502 | tristate expected) | |
6503 | { | |
6504 | tristate actual = model.eval_condition (lhs, op, rhs, NULL); | |
6505 | ASSERT_EQ_AT (loc, actual, expected); | |
6506 | } | |
6507 | ||
90f7c300 DM |
6508 | /* Implementation detail of ASSERT_DUMP_TREE_EQ. */ |
6509 | ||
6510 | static void | |
6511 | assert_dump_tree_eq (const location &loc, tree t, const char *expected) | |
6512 | { | |
6513 | auto_fix_quotes sentinel; | |
6514 | pretty_printer pp; | |
6515 | pp_format_decoder (&pp) = default_tree_printer; | |
6516 | dump_tree (&pp, t); | |
6517 | ASSERT_STREQ_AT (loc, pp_formatted_text (&pp), expected); | |
6518 | } | |
6519 | ||
6520 | /* Assert that dump_tree (T) is EXPECTED. */ | |
6521 | ||
6522 | #define ASSERT_DUMP_TREE_EQ(T, EXPECTED) \ | |
6523 | SELFTEST_BEGIN_STMT \ | |
6524 | assert_dump_tree_eq ((SELFTEST_LOCATION), (T), (EXPECTED)); \ | |
6525 | SELFTEST_END_STMT | |
6526 | ||
757bf1df DM |
6527 | /* Implementation detail of ASSERT_DUMP_EQ. */ |
6528 | ||
6529 | static void | |
6530 | assert_dump_eq (const location &loc, | |
6531 | const region_model &model, | |
6532 | bool summarize, | |
6533 | const char *expected) | |
6534 | { | |
6535 | auto_fix_quotes sentinel; | |
6536 | pretty_printer pp; | |
6537 | pp_format_decoder (&pp) = default_tree_printer; | |
808f4dfe DM |
6538 | |
6539 | model.dump_to_pp (&pp, summarize, true); | |
757bf1df DM |
6540 | ASSERT_STREQ_AT (loc, pp_formatted_text (&pp), expected); |
6541 | } | |
6542 | ||
6543 | /* Assert that MODEL.dump_to_pp (SUMMARIZE) is EXPECTED. */ | |
6544 | ||
6545 | #define ASSERT_DUMP_EQ(MODEL, SUMMARIZE, EXPECTED) \ | |
6546 | SELFTEST_BEGIN_STMT \ | |
6547 | assert_dump_eq ((SELFTEST_LOCATION), (MODEL), (SUMMARIZE), (EXPECTED)); \ | |
6548 | SELFTEST_END_STMT | |
6549 | ||
6550 | /* Smoketest for region_model::dump_to_pp. */ | |
6551 | ||
6552 | static void | |
6553 | test_dump () | |
6554 | { | |
808f4dfe DM |
6555 | region_model_manager mgr; |
6556 | region_model model (&mgr); | |
757bf1df DM |
6557 | |
6558 | ASSERT_DUMP_EQ (model, false, | |
808f4dfe DM |
6559 | "stack depth: 0\n" |
6560 | "m_called_unknown_fn: FALSE\n" | |
6561 | "constraint_manager:\n" | |
6562 | " equiv classes:\n" | |
6563 | " constraints:\n"); | |
6564 | ASSERT_DUMP_EQ (model, true, | |
6565 | "stack depth: 0\n" | |
6566 | "m_called_unknown_fn: FALSE\n" | |
6567 | "constraint_manager:\n" | |
757bf1df DM |
6568 | " equiv classes:\n" |
6569 | " constraints:\n"); | |
757bf1df DM |
6570 | } |
6571 | ||
884d9141 DM |
6572 | /* Helper function for selftests. Create a struct or union type named NAME, |
6573 | with the fields given by the FIELD_DECLS in FIELDS. | |
6574 | If IS_STRUCT is true create a RECORD_TYPE (aka a struct), otherwise | |
6575 | create a UNION_TYPE. */ | |
6576 | ||
6577 | static tree | |
6578 | make_test_compound_type (const char *name, bool is_struct, | |
6579 | const auto_vec<tree> *fields) | |
6580 | { | |
6581 | tree t = make_node (is_struct ? RECORD_TYPE : UNION_TYPE); | |
6582 | TYPE_NAME (t) = get_identifier (name); | |
6583 | TYPE_SIZE (t) = 0; | |
6584 | ||
6585 | tree fieldlist = NULL; | |
6586 | int i; | |
6587 | tree field; | |
6588 | FOR_EACH_VEC_ELT (*fields, i, field) | |
6589 | { | |
6590 | gcc_assert (TREE_CODE (field) == FIELD_DECL); | |
6591 | DECL_CONTEXT (field) = t; | |
6592 | fieldlist = chainon (field, fieldlist); | |
6593 | } | |
6594 | fieldlist = nreverse (fieldlist); | |
6595 | TYPE_FIELDS (t) = fieldlist; | |
6596 | ||
6597 | layout_type (t); | |
6598 | return t; | |
6599 | } | |
6600 | ||
a96f1c38 DM |
6601 | /* Selftest fixture for creating the type "struct coord {int x; int y; };". */ |
6602 | ||
6603 | struct coord_test | |
6604 | { | |
6605 | coord_test () | |
6606 | { | |
6607 | auto_vec<tree> fields; | |
6608 | m_x_field = build_decl (UNKNOWN_LOCATION, FIELD_DECL, | |
6609 | get_identifier ("x"), integer_type_node); | |
6610 | fields.safe_push (m_x_field); | |
6611 | m_y_field = build_decl (UNKNOWN_LOCATION, FIELD_DECL, | |
6612 | get_identifier ("y"), integer_type_node); | |
6613 | fields.safe_push (m_y_field); | |
6614 | m_coord_type = make_test_compound_type ("coord", true, &fields); | |
6615 | } | |
6616 | ||
6617 | tree m_x_field; | |
6618 | tree m_y_field; | |
6619 | tree m_coord_type; | |
6620 | }; | |
6621 | ||
808f4dfe | 6622 | /* Verify usage of a struct. */ |
884d9141 DM |
6623 | |
6624 | static void | |
808f4dfe | 6625 | test_struct () |
884d9141 | 6626 | { |
a96f1c38 DM |
6627 | coord_test ct; |
6628 | ||
6629 | tree c = build_global_decl ("c", ct.m_coord_type); | |
6630 | tree c_x = build3 (COMPONENT_REF, TREE_TYPE (ct.m_x_field), | |
6631 | c, ct.m_x_field, NULL_TREE); | |
6632 | tree c_y = build3 (COMPONENT_REF, TREE_TYPE (ct.m_y_field), | |
6633 | c, ct.m_y_field, NULL_TREE); | |
884d9141 DM |
6634 | |
6635 | tree int_17 = build_int_cst (integer_type_node, 17); | |
6636 | tree int_m3 = build_int_cst (integer_type_node, -3); | |
6637 | ||
808f4dfe DM |
6638 | region_model_manager mgr; |
6639 | region_model model (&mgr); | |
884d9141 DM |
6640 | model.set_value (c_x, int_17, NULL); |
6641 | model.set_value (c_y, int_m3, NULL); | |
6642 | ||
808f4dfe DM |
6643 | /* Verify get_offset for "c.x". */ |
6644 | { | |
6645 | const region *c_x_reg = model.get_lvalue (c_x, NULL); | |
7a6564c9 | 6646 | region_offset offset = c_x_reg->get_offset (&mgr); |
808f4dfe DM |
6647 | ASSERT_EQ (offset.get_base_region (), model.get_lvalue (c, NULL)); |
6648 | ASSERT_EQ (offset.get_bit_offset (), 0); | |
6649 | } | |
6650 | ||
6651 | /* Verify get_offset for "c.y". */ | |
6652 | { | |
6653 | const region *c_y_reg = model.get_lvalue (c_y, NULL); | |
7a6564c9 | 6654 | region_offset offset = c_y_reg->get_offset (&mgr); |
808f4dfe DM |
6655 | ASSERT_EQ (offset.get_base_region (), model.get_lvalue (c, NULL)); |
6656 | ASSERT_EQ (offset.get_bit_offset (), INT_TYPE_SIZE); | |
6657 | } | |
884d9141 DM |
6658 | } |
6659 | ||
808f4dfe | 6660 | /* Verify usage of an array element. */ |
884d9141 DM |
6661 | |
6662 | static void | |
808f4dfe | 6663 | test_array_1 () |
884d9141 DM |
6664 | { |
6665 | tree tlen = size_int (10); | |
6666 | tree arr_type = build_array_type (char_type_node, build_index_type (tlen)); | |
6667 | ||
6668 | tree a = build_global_decl ("a", arr_type); | |
6669 | ||
808f4dfe DM |
6670 | region_model_manager mgr; |
6671 | region_model model (&mgr); | |
884d9141 DM |
6672 | tree int_0 = build_int_cst (integer_type_node, 0); |
6673 | tree a_0 = build4 (ARRAY_REF, char_type_node, | |
6674 | a, int_0, NULL_TREE, NULL_TREE); | |
6675 | tree char_A = build_int_cst (char_type_node, 'A'); | |
6676 | model.set_value (a_0, char_A, NULL); | |
884d9141 DM |
6677 | } |
6678 | ||
90f7c300 DM |
6679 | /* Verify that region_model::get_representative_tree works as expected. */ |
6680 | ||
6681 | static void | |
6682 | test_get_representative_tree () | |
6683 | { | |
808f4dfe DM |
6684 | region_model_manager mgr; |
6685 | ||
90f7c300 DM |
6686 | /* STRING_CST. */ |
6687 | { | |
6688 | tree string_cst = build_string (4, "foo"); | |
808f4dfe DM |
6689 | region_model m (&mgr); |
6690 | const svalue *str_sval = m.get_rvalue (string_cst, NULL); | |
6691 | tree rep = m.get_representative_tree (str_sval); | |
90f7c300 DM |
6692 | ASSERT_EQ (rep, string_cst); |
6693 | } | |
6694 | ||
6695 | /* String literal. */ | |
6696 | { | |
6697 | tree string_cst_ptr = build_string_literal (4, "foo"); | |
808f4dfe DM |
6698 | region_model m (&mgr); |
6699 | const svalue *str_sval = m.get_rvalue (string_cst_ptr, NULL); | |
6700 | tree rep = m.get_representative_tree (str_sval); | |
90f7c300 DM |
6701 | ASSERT_DUMP_TREE_EQ (rep, "&\"foo\"[0]"); |
6702 | } | |
808f4dfe DM |
6703 | |
6704 | /* Value of an element within an array. */ | |
6705 | { | |
6706 | tree tlen = size_int (10); | |
6707 | tree arr_type = build_array_type (char_type_node, build_index_type (tlen)); | |
6708 | tree a = build_global_decl ("a", arr_type); | |
9d804f9b DM |
6709 | placeholder_svalue test_sval (mgr.alloc_symbol_id (), |
6710 | char_type_node, "test value"); | |
808f4dfe DM |
6711 | |
6712 | /* Value of a[3]. */ | |
6713 | { | |
6714 | test_region_model_context ctxt; | |
6715 | region_model model (&mgr); | |
6716 | tree int_3 = build_int_cst (integer_type_node, 3); | |
6717 | tree a_3 = build4 (ARRAY_REF, char_type_node, | |
6718 | a, int_3, NULL_TREE, NULL_TREE); | |
6719 | const region *a_3_reg = model.get_lvalue (a_3, &ctxt); | |
6720 | model.set_value (a_3_reg, &test_sval, &ctxt); | |
6721 | tree rep = model.get_representative_tree (&test_sval); | |
6722 | ASSERT_DUMP_TREE_EQ (rep, "a[3]"); | |
6723 | } | |
6724 | ||
6725 | /* Value of a[0]. */ | |
6726 | { | |
6727 | test_region_model_context ctxt; | |
6728 | region_model model (&mgr); | |
6729 | tree idx = build_int_cst (integer_type_node, 0); | |
6730 | tree a_0 = build4 (ARRAY_REF, char_type_node, | |
6731 | a, idx, NULL_TREE, NULL_TREE); | |
6732 | const region *a_0_reg = model.get_lvalue (a_0, &ctxt); | |
6733 | model.set_value (a_0_reg, &test_sval, &ctxt); | |
6734 | tree rep = model.get_representative_tree (&test_sval); | |
6735 | ASSERT_DUMP_TREE_EQ (rep, "a[0]"); | |
6736 | } | |
6737 | } | |
6738 | ||
6739 | /* Value of a field within a struct. */ | |
6740 | { | |
6741 | coord_test ct; | |
6742 | ||
6743 | tree c = build_global_decl ("c", ct.m_coord_type); | |
6744 | tree c_x = build3 (COMPONENT_REF, TREE_TYPE (ct.m_x_field), | |
6745 | c, ct.m_x_field, NULL_TREE); | |
6746 | tree c_y = build3 (COMPONENT_REF, TREE_TYPE (ct.m_y_field), | |
6747 | c, ct.m_y_field, NULL_TREE); | |
6748 | ||
6749 | test_region_model_context ctxt; | |
6750 | ||
6751 | /* Value of initial field. */ | |
6752 | { | |
6753 | region_model m (&mgr); | |
6754 | const region *c_x_reg = m.get_lvalue (c_x, &ctxt); | |
9d804f9b DM |
6755 | placeholder_svalue test_sval_x (mgr.alloc_symbol_id (), |
6756 | integer_type_node, "test x val"); | |
808f4dfe DM |
6757 | m.set_value (c_x_reg, &test_sval_x, &ctxt); |
6758 | tree rep = m.get_representative_tree (&test_sval_x); | |
6759 | ASSERT_DUMP_TREE_EQ (rep, "c.x"); | |
6760 | } | |
6761 | ||
6762 | /* Value of non-initial field. */ | |
6763 | { | |
6764 | region_model m (&mgr); | |
6765 | const region *c_y_reg = m.get_lvalue (c_y, &ctxt); | |
9d804f9b DM |
6766 | placeholder_svalue test_sval_y (mgr.alloc_symbol_id (), |
6767 | integer_type_node, "test y val"); | |
808f4dfe DM |
6768 | m.set_value (c_y_reg, &test_sval_y, &ctxt); |
6769 | tree rep = m.get_representative_tree (&test_sval_y); | |
6770 | ASSERT_DUMP_TREE_EQ (rep, "c.y"); | |
6771 | } | |
6772 | } | |
90f7c300 DM |
6773 | } |
6774 | ||
757bf1df | 6775 | /* Verify that calling region_model::get_rvalue repeatedly on the same |
808f4dfe | 6776 | tree constant retrieves the same svalue *. */ |
757bf1df DM |
6777 | |
6778 | static void | |
6779 | test_unique_constants () | |
6780 | { | |
6781 | tree int_0 = build_int_cst (integer_type_node, 0); | |
6782 | tree int_42 = build_int_cst (integer_type_node, 42); | |
6783 | ||
6784 | test_region_model_context ctxt; | |
808f4dfe DM |
6785 | region_model_manager mgr; |
6786 | region_model model (&mgr); | |
757bf1df DM |
6787 | ASSERT_EQ (model.get_rvalue (int_0, &ctxt), model.get_rvalue (int_0, &ctxt)); |
6788 | ASSERT_EQ (model.get_rvalue (int_42, &ctxt), | |
6789 | model.get_rvalue (int_42, &ctxt)); | |
6790 | ASSERT_NE (model.get_rvalue (int_0, &ctxt), model.get_rvalue (int_42, &ctxt)); | |
6791 | ASSERT_EQ (ctxt.get_num_diagnostics (), 0); | |
757bf1df | 6792 | |
808f4dfe DM |
6793 | /* A "(const int)42" will be a different tree from "(int)42)"... */ |
6794 | tree const_int_type_node | |
6795 | = build_qualified_type (integer_type_node, TYPE_QUAL_CONST); | |
6796 | tree const_int_42 = build_int_cst (const_int_type_node, 42); | |
6797 | ASSERT_NE (int_42, const_int_42); | |
6798 | /* It should have a different const_svalue. */ | |
6799 | const svalue *int_42_sval = model.get_rvalue (int_42, &ctxt); | |
6800 | const svalue *const_int_42_sval = model.get_rvalue (const_int_42, &ctxt); | |
6801 | ASSERT_NE (int_42_sval, const_int_42_sval); | |
6802 | /* But they should compare as equal. */ | |
6803 | ASSERT_CONDITION_TRUE (model, int_42_sval, EQ_EXPR, const_int_42_sval); | |
6804 | ASSERT_CONDITION_FALSE (model, int_42_sval, NE_EXPR, const_int_42_sval); | |
757bf1df DM |
6805 | } |
6806 | ||
808f4dfe DM |
6807 | /* Verify that each type gets its own singleton unknown_svalue within a |
6808 | region_model_manager, and that NULL_TREE gets its own singleton. */ | |
757bf1df DM |
6809 | |
6810 | static void | |
808f4dfe | 6811 | test_unique_unknowns () |
757bf1df | 6812 | { |
808f4dfe DM |
6813 | region_model_manager mgr; |
6814 | const svalue *unknown_int | |
6815 | = mgr.get_or_create_unknown_svalue (integer_type_node); | |
6816 | /* Repeated calls with the same type should get the same "unknown" | |
6817 | svalue. */ | |
6818 | const svalue *unknown_int_2 | |
6819 | = mgr.get_or_create_unknown_svalue (integer_type_node); | |
6820 | ASSERT_EQ (unknown_int, unknown_int_2); | |
757bf1df | 6821 | |
808f4dfe DM |
6822 | /* Different types (or the NULL type) should have different |
6823 | unknown_svalues. */ | |
6824 | const svalue *unknown_NULL_type = mgr.get_or_create_unknown_svalue (NULL); | |
6825 | ASSERT_NE (unknown_NULL_type, unknown_int); | |
757bf1df | 6826 | |
808f4dfe DM |
6827 | /* Repeated calls with NULL for the type should get the same "unknown" |
6828 | svalue. */ | |
6829 | const svalue *unknown_NULL_type_2 = mgr.get_or_create_unknown_svalue (NULL); | |
6830 | ASSERT_EQ (unknown_NULL_type, unknown_NULL_type_2); | |
757bf1df DM |
6831 | } |
6832 | ||
808f4dfe | 6833 | /* Verify that initial_svalue are handled as expected. */ |
757bf1df | 6834 | |
808f4dfe DM |
6835 | static void |
6836 | test_initial_svalue_folding () | |
757bf1df | 6837 | { |
808f4dfe DM |
6838 | region_model_manager mgr; |
6839 | tree x = build_global_decl ("x", integer_type_node); | |
6840 | tree y = build_global_decl ("y", integer_type_node); | |
757bf1df | 6841 | |
808f4dfe DM |
6842 | test_region_model_context ctxt; |
6843 | region_model model (&mgr); | |
6844 | const svalue *x_init = model.get_rvalue (x, &ctxt); | |
6845 | const svalue *y_init = model.get_rvalue (y, &ctxt); | |
6846 | ASSERT_NE (x_init, y_init); | |
6847 | const region *x_reg = model.get_lvalue (x, &ctxt); | |
6848 | ASSERT_EQ (x_init, mgr.get_or_create_initial_value (x_reg)); | |
757bf1df | 6849 | |
808f4dfe | 6850 | } |
757bf1df | 6851 | |
808f4dfe | 6852 | /* Verify that unary ops are folded as expected. */ |
757bf1df DM |
6853 | |
6854 | static void | |
808f4dfe | 6855 | test_unaryop_svalue_folding () |
757bf1df | 6856 | { |
808f4dfe | 6857 | region_model_manager mgr; |
757bf1df DM |
6858 | tree x = build_global_decl ("x", integer_type_node); |
6859 | tree y = build_global_decl ("y", integer_type_node); | |
6860 | ||
808f4dfe DM |
6861 | test_region_model_context ctxt; |
6862 | region_model model (&mgr); | |
6863 | const svalue *x_init = model.get_rvalue (x, &ctxt); | |
6864 | const svalue *y_init = model.get_rvalue (y, &ctxt); | |
6865 | const region *x_reg = model.get_lvalue (x, &ctxt); | |
6866 | ASSERT_EQ (x_init, mgr.get_or_create_initial_value (x_reg)); | |
6867 | ||
6868 | /* "(int)x" -> "x". */ | |
6869 | ASSERT_EQ (x_init, mgr.get_or_create_cast (integer_type_node, x_init)); | |
6870 | ||
6871 | /* "(void *)x" -> something other than "x". */ | |
6872 | ASSERT_NE (x_init, mgr.get_or_create_cast (ptr_type_node, x_init)); | |
6873 | ||
6874 | /* "!(x == y)" -> "x != y". */ | |
6875 | ASSERT_EQ (mgr.get_or_create_unaryop | |
6876 | (boolean_type_node, TRUTH_NOT_EXPR, | |
6877 | mgr.get_or_create_binop (boolean_type_node, EQ_EXPR, | |
6878 | x_init, y_init)), | |
6879 | mgr.get_or_create_binop (boolean_type_node, NE_EXPR, | |
6880 | x_init, y_init)); | |
6881 | /* "!(x > y)" -> "x <= y". */ | |
6882 | ASSERT_EQ (mgr.get_or_create_unaryop | |
6883 | (boolean_type_node, TRUTH_NOT_EXPR, | |
6884 | mgr.get_or_create_binop (boolean_type_node, GT_EXPR, | |
6885 | x_init, y_init)), | |
6886 | mgr.get_or_create_binop (boolean_type_node, LE_EXPR, | |
6887 | x_init, y_init)); | |
6888 | } | |
6889 | ||
6890 | /* Verify that binops on constant svalues are folded. */ | |
757bf1df | 6891 | |
808f4dfe DM |
6892 | static void |
6893 | test_binop_svalue_folding () | |
6894 | { | |
6895 | #define NUM_CSTS 10 | |
6896 | tree cst_int[NUM_CSTS]; | |
6897 | region_model_manager mgr; | |
6898 | const svalue *cst_sval[NUM_CSTS]; | |
6899 | for (int i = 0; i < NUM_CSTS; i++) | |
6900 | { | |
6901 | cst_int[i] = build_int_cst (integer_type_node, i); | |
6902 | cst_sval[i] = mgr.get_or_create_constant_svalue (cst_int[i]); | |
6903 | ASSERT_EQ (cst_sval[i]->get_kind (), SK_CONSTANT); | |
6904 | ASSERT_EQ (cst_sval[i]->maybe_get_constant (), cst_int[i]); | |
6905 | } | |
757bf1df | 6906 | |
808f4dfe DM |
6907 | for (int i = 0; i < NUM_CSTS; i++) |
6908 | for (int j = 0; j < NUM_CSTS; j++) | |
6909 | { | |
6910 | if (i != j) | |
6911 | ASSERT_NE (cst_sval[i], cst_sval[j]); | |
6912 | if (i + j < NUM_CSTS) | |
6913 | { | |
6914 | const svalue *sum | |
6915 | = mgr.get_or_create_binop (integer_type_node, PLUS_EXPR, | |
6916 | cst_sval[i], cst_sval[j]); | |
6917 | ASSERT_EQ (sum, cst_sval[i + j]); | |
6918 | } | |
6919 | if (i - j >= 0) | |
6920 | { | |
6921 | const svalue *difference | |
6922 | = mgr.get_or_create_binop (integer_type_node, MINUS_EXPR, | |
6923 | cst_sval[i], cst_sval[j]); | |
6924 | ASSERT_EQ (difference, cst_sval[i - j]); | |
6925 | } | |
6926 | if (i * j < NUM_CSTS) | |
6927 | { | |
6928 | const svalue *product | |
6929 | = mgr.get_or_create_binop (integer_type_node, MULT_EXPR, | |
6930 | cst_sval[i], cst_sval[j]); | |
6931 | ASSERT_EQ (product, cst_sval[i * j]); | |
6932 | } | |
6933 | const svalue *eq = mgr.get_or_create_binop (integer_type_node, EQ_EXPR, | |
6934 | cst_sval[i], cst_sval[j]); | |
6935 | ASSERT_EQ (eq, i == j ? cst_sval[1] : cst_sval [0]); | |
6936 | const svalue *neq = mgr.get_or_create_binop (integer_type_node, NE_EXPR, | |
6937 | cst_sval[i], cst_sval[j]); | |
6938 | ASSERT_EQ (neq, i != j ? cst_sval[1] : cst_sval [0]); | |
6939 | // etc | |
6940 | } | |
757bf1df | 6941 | |
808f4dfe | 6942 | tree x = build_global_decl ("x", integer_type_node); |
757bf1df | 6943 | |
808f4dfe DM |
6944 | test_region_model_context ctxt; |
6945 | region_model model (&mgr); | |
6946 | const svalue *x_init = model.get_rvalue (x, &ctxt); | |
6947 | ||
6948 | /* PLUS_EXPR folding. */ | |
6949 | const svalue *x_init_plus_zero | |
6950 | = mgr.get_or_create_binop (integer_type_node, PLUS_EXPR, | |
6951 | x_init, cst_sval[0]); | |
6952 | ASSERT_EQ (x_init_plus_zero, x_init); | |
6953 | const svalue *zero_plus_x_init | |
6954 | = mgr.get_or_create_binop (integer_type_node, PLUS_EXPR, | |
6955 | cst_sval[0], x_init); | |
6956 | ASSERT_EQ (zero_plus_x_init, x_init); | |
6957 | ||
6958 | /* MULT_EXPR folding. */ | |
6959 | const svalue *x_init_times_zero | |
6960 | = mgr.get_or_create_binop (integer_type_node, MULT_EXPR, | |
6961 | x_init, cst_sval[0]); | |
6962 | ASSERT_EQ (x_init_times_zero, cst_sval[0]); | |
6963 | const svalue *zero_times_x_init | |
6964 | = mgr.get_or_create_binop (integer_type_node, MULT_EXPR, | |
6965 | cst_sval[0], x_init); | |
6966 | ASSERT_EQ (zero_times_x_init, cst_sval[0]); | |
6967 | ||
6968 | const svalue *x_init_times_one | |
6969 | = mgr.get_or_create_binop (integer_type_node, MULT_EXPR, | |
6970 | x_init, cst_sval[1]); | |
6971 | ASSERT_EQ (x_init_times_one, x_init); | |
6972 | const svalue *one_times_x_init | |
6973 | = mgr.get_or_create_binop (integer_type_node, MULT_EXPR, | |
6974 | cst_sval[1], x_init); | |
6975 | ASSERT_EQ (one_times_x_init, x_init); | |
6976 | ||
6977 | // etc | |
6978 | // TODO: do we want to use the match-and-simplify DSL for this? | |
6979 | ||
6980 | /* Verify that binops put any constants on the RHS. */ | |
6981 | const svalue *four_times_x_init | |
6982 | = mgr.get_or_create_binop (integer_type_node, MULT_EXPR, | |
6983 | cst_sval[4], x_init); | |
6984 | const svalue *x_init_times_four | |
6985 | = mgr.get_or_create_binop (integer_type_node, MULT_EXPR, | |
6986 | x_init, cst_sval[4]); | |
6987 | ASSERT_EQ (four_times_x_init, x_init_times_four); | |
6988 | const binop_svalue *binop = four_times_x_init->dyn_cast_binop_svalue (); | |
6989 | ASSERT_EQ (binop->get_op (), MULT_EXPR); | |
6990 | ASSERT_EQ (binop->get_arg0 (), x_init); | |
6991 | ASSERT_EQ (binop->get_arg1 (), cst_sval[4]); | |
6992 | ||
6993 | /* Verify that ((x + 1) + 1) == (x + 2). */ | |
6994 | const svalue *x_init_plus_one | |
6995 | = mgr.get_or_create_binop (integer_type_node, PLUS_EXPR, | |
6996 | x_init, cst_sval[1]); | |
6997 | const svalue *x_init_plus_two | |
6998 | = mgr.get_or_create_binop (integer_type_node, PLUS_EXPR, | |
6999 | x_init, cst_sval[2]); | |
7000 | const svalue *x_init_plus_one_plus_one | |
7001 | = mgr.get_or_create_binop (integer_type_node, PLUS_EXPR, | |
7002 | x_init_plus_one, cst_sval[1]); | |
7003 | ASSERT_EQ (x_init_plus_one_plus_one, x_init_plus_two); | |
4f34f8cc DM |
7004 | |
7005 | /* Verify various binops on booleans. */ | |
7006 | { | |
7007 | const svalue *sval_true = mgr.get_or_create_int_cst (boolean_type_node, 1); | |
7008 | const svalue *sval_false = mgr.get_or_create_int_cst (boolean_type_node, 0); | |
7009 | const svalue *sval_unknown | |
7010 | = mgr.get_or_create_unknown_svalue (boolean_type_node); | |
9d804f9b DM |
7011 | const placeholder_svalue sval_placeholder (mgr.alloc_symbol_id (), |
7012 | boolean_type_node, "v"); | |
4f34f8cc DM |
7013 | for (auto op : {BIT_IOR_EXPR, TRUTH_OR_EXPR}) |
7014 | { | |
7015 | ASSERT_EQ (mgr.get_or_create_binop (boolean_type_node, op, | |
7016 | sval_true, sval_unknown), | |
7017 | sval_true); | |
7018 | ASSERT_EQ (mgr.get_or_create_binop (boolean_type_node, op, | |
7019 | sval_false, sval_unknown), | |
7020 | sval_unknown); | |
7021 | ASSERT_EQ (mgr.get_or_create_binop (boolean_type_node, op, | |
7022 | sval_false, &sval_placeholder), | |
7023 | &sval_placeholder); | |
7024 | } | |
7025 | for (auto op : {BIT_AND_EXPR, TRUTH_AND_EXPR}) | |
7026 | { | |
7027 | ASSERT_EQ (mgr.get_or_create_binop (boolean_type_node, op, | |
7028 | sval_false, sval_unknown), | |
7029 | sval_false); | |
7030 | ASSERT_EQ (mgr.get_or_create_binop (boolean_type_node, op, | |
7031 | sval_true, sval_unknown), | |
7032 | sval_unknown); | |
7033 | ASSERT_EQ (mgr.get_or_create_binop (boolean_type_node, op, | |
7034 | sval_true, &sval_placeholder), | |
7035 | &sval_placeholder); | |
7036 | } | |
7037 | } | |
808f4dfe DM |
7038 | } |
7039 | ||
7040 | /* Verify that sub_svalues are folded as expected. */ | |
757bf1df | 7041 | |
808f4dfe DM |
7042 | static void |
7043 | test_sub_svalue_folding () | |
7044 | { | |
7045 | coord_test ct; | |
7046 | tree c = build_global_decl ("c", ct.m_coord_type); | |
7047 | tree c_x = build3 (COMPONENT_REF, TREE_TYPE (ct.m_x_field), | |
7048 | c, ct.m_x_field, NULL_TREE); | |
757bf1df | 7049 | |
808f4dfe DM |
7050 | region_model_manager mgr; |
7051 | region_model model (&mgr); | |
7052 | test_region_model_context ctxt; | |
7053 | const region *c_x_reg = model.get_lvalue (c_x, &ctxt); | |
757bf1df | 7054 | |
808f4dfe DM |
7055 | /* Verify that sub_svalue of "unknown" simply |
7056 | yields an unknown. */ | |
757bf1df | 7057 | |
808f4dfe DM |
7058 | const svalue *unknown = mgr.get_or_create_unknown_svalue (ct.m_coord_type); |
7059 | const svalue *sub = mgr.get_or_create_sub_svalue (TREE_TYPE (ct.m_x_field), | |
7060 | unknown, c_x_reg); | |
7061 | ASSERT_EQ (sub->get_kind (), SK_UNKNOWN); | |
7062 | ASSERT_EQ (sub->get_type (), TREE_TYPE (ct.m_x_field)); | |
757bf1df DM |
7063 | } |
7064 | ||
f09b9955 DM |
7065 | /* Get BIT within VAL as a symbolic value within MGR. */ |
7066 | ||
7067 | static const svalue * | |
7068 | get_bit (region_model_manager *mgr, | |
7069 | bit_offset_t bit, | |
7070 | unsigned HOST_WIDE_INT val) | |
7071 | { | |
7072 | const svalue *inner_svalue | |
7073 | = mgr->get_or_create_int_cst (unsigned_type_node, val); | |
7074 | return mgr->get_or_create_bits_within (boolean_type_node, | |
7075 | bit_range (bit, 1), | |
7076 | inner_svalue); | |
7077 | } | |
7078 | ||
7079 | /* Verify that bits_within_svalues are folded as expected. */ | |
7080 | ||
7081 | static void | |
7082 | test_bits_within_svalue_folding () | |
7083 | { | |
7084 | region_model_manager mgr; | |
7085 | ||
7086 | const svalue *zero = mgr.get_or_create_int_cst (boolean_type_node, 0); | |
7087 | const svalue *one = mgr.get_or_create_int_cst (boolean_type_node, 1); | |
7088 | ||
7089 | { | |
7090 | const unsigned val = 0x0000; | |
7091 | for (unsigned bit = 0; bit < 16; bit++) | |
7092 | ASSERT_EQ (get_bit (&mgr, bit, val), zero); | |
7093 | } | |
7094 | ||
7095 | { | |
7096 | const unsigned val = 0x0001; | |
7097 | ASSERT_EQ (get_bit (&mgr, 0, val), one); | |
7098 | for (unsigned bit = 1; bit < 16; bit++) | |
7099 | ASSERT_EQ (get_bit (&mgr, bit, val), zero); | |
7100 | } | |
7101 | ||
7102 | { | |
7103 | const unsigned val = 0x8000; | |
7104 | for (unsigned bit = 0; bit < 15; bit++) | |
7105 | ASSERT_EQ (get_bit (&mgr, bit, val), zero); | |
7106 | ASSERT_EQ (get_bit (&mgr, 15, val), one); | |
7107 | } | |
7108 | ||
7109 | { | |
7110 | const unsigned val = 0xFFFF; | |
7111 | for (unsigned bit = 0; bit < 16; bit++) | |
7112 | ASSERT_EQ (get_bit (&mgr, bit, val), one); | |
7113 | } | |
7114 | } | |
7115 | ||
808f4dfe | 7116 | /* Test that region::descendent_of_p works as expected. */ |
757bf1df DM |
7117 | |
7118 | static void | |
808f4dfe | 7119 | test_descendent_of_p () |
757bf1df | 7120 | { |
808f4dfe DM |
7121 | region_model_manager mgr; |
7122 | const region *stack = mgr.get_stack_region (); | |
7123 | const region *heap = mgr.get_heap_region (); | |
7124 | const region *code = mgr.get_code_region (); | |
7125 | const region *globals = mgr.get_globals_region (); | |
757bf1df | 7126 | |
808f4dfe DM |
7127 | /* descendent_of_p should return true when used on the region itself. */ |
7128 | ASSERT_TRUE (stack->descendent_of_p (stack)); | |
7129 | ASSERT_FALSE (stack->descendent_of_p (heap)); | |
7130 | ASSERT_FALSE (stack->descendent_of_p (code)); | |
7131 | ASSERT_FALSE (stack->descendent_of_p (globals)); | |
757bf1df | 7132 | |
808f4dfe DM |
7133 | tree x = build_global_decl ("x", integer_type_node); |
7134 | const region *x_reg = mgr.get_region_for_global (x); | |
7135 | ASSERT_TRUE (x_reg->descendent_of_p (globals)); | |
757bf1df | 7136 | |
808f4dfe DM |
7137 | /* A cast_region should be a descendent of the original region. */ |
7138 | const region *cast_reg = mgr.get_cast_region (x_reg, ptr_type_node); | |
7139 | ASSERT_TRUE (cast_reg->descendent_of_p (x_reg)); | |
757bf1df DM |
7140 | } |
7141 | ||
391512ad DM |
7142 | /* Verify that bit_range_region works as expected. */ |
7143 | ||
7144 | static void | |
7145 | test_bit_range_regions () | |
7146 | { | |
7147 | tree x = build_global_decl ("x", integer_type_node); | |
7148 | region_model_manager mgr; | |
7149 | const region *x_reg = mgr.get_region_for_global (x); | |
7150 | const region *byte0 | |
7151 | = mgr.get_bit_range (x_reg, char_type_node, bit_range (0, 8)); | |
7152 | const region *byte1 | |
7153 | = mgr.get_bit_range (x_reg, char_type_node, bit_range (8, 8)); | |
7154 | ASSERT_TRUE (byte0->descendent_of_p (x_reg)); | |
7155 | ASSERT_TRUE (byte1->descendent_of_p (x_reg)); | |
7156 | ASSERT_NE (byte0, byte1); | |
7157 | } | |
7158 | ||
757bf1df DM |
7159 | /* Verify that simple assignments work as expected. */ |
7160 | ||
7161 | static void | |
7162 | test_assignment () | |
7163 | { | |
7164 | tree int_0 = build_int_cst (integer_type_node, 0); | |
7165 | tree x = build_global_decl ("x", integer_type_node); | |
7166 | tree y = build_global_decl ("y", integer_type_node); | |
7167 | ||
7168 | /* "x == 0", then use of y, then "y = 0;". */ | |
808f4dfe DM |
7169 | region_model_manager mgr; |
7170 | region_model model (&mgr); | |
757bf1df DM |
7171 | ADD_SAT_CONSTRAINT (model, x, EQ_EXPR, int_0); |
7172 | ASSERT_CONDITION_UNKNOWN (model, y, EQ_EXPR, int_0); | |
7173 | model.set_value (model.get_lvalue (y, NULL), | |
7174 | model.get_rvalue (int_0, NULL), | |
7175 | NULL); | |
7176 | ASSERT_CONDITION_TRUE (model, y, EQ_EXPR, int_0); | |
7177 | ASSERT_CONDITION_TRUE (model, y, EQ_EXPR, x); | |
757bf1df DM |
7178 | } |
7179 | ||
a96f1c38 DM |
7180 | /* Verify that compound assignments work as expected. */ |
7181 | ||
7182 | static void | |
7183 | test_compound_assignment () | |
7184 | { | |
7185 | coord_test ct; | |
7186 | ||
7187 | tree c = build_global_decl ("c", ct.m_coord_type); | |
7188 | tree c_x = build3 (COMPONENT_REF, TREE_TYPE (ct.m_x_field), | |
7189 | c, ct.m_x_field, NULL_TREE); | |
7190 | tree c_y = build3 (COMPONENT_REF, TREE_TYPE (ct.m_y_field), | |
7191 | c, ct.m_y_field, NULL_TREE); | |
7192 | tree d = build_global_decl ("d", ct.m_coord_type); | |
7193 | tree d_x = build3 (COMPONENT_REF, TREE_TYPE (ct.m_x_field), | |
7194 | d, ct.m_x_field, NULL_TREE); | |
7195 | tree d_y = build3 (COMPONENT_REF, TREE_TYPE (ct.m_y_field), | |
7196 | d, ct.m_y_field, NULL_TREE); | |
7197 | ||
7198 | tree int_17 = build_int_cst (integer_type_node, 17); | |
7199 | tree int_m3 = build_int_cst (integer_type_node, -3); | |
7200 | ||
808f4dfe DM |
7201 | region_model_manager mgr; |
7202 | region_model model (&mgr); | |
a96f1c38 DM |
7203 | model.set_value (c_x, int_17, NULL); |
7204 | model.set_value (c_y, int_m3, NULL); | |
7205 | ||
a96f1c38 | 7206 | /* Copy c to d. */ |
13ad6d9f DM |
7207 | const svalue *sval = model.get_rvalue (c, NULL); |
7208 | model.set_value (model.get_lvalue (d, NULL), sval, NULL); | |
7209 | ||
a96f1c38 DM |
7210 | /* Check that the fields have the same svalues. */ |
7211 | ASSERT_EQ (model.get_rvalue (c_x, NULL), model.get_rvalue (d_x, NULL)); | |
7212 | ASSERT_EQ (model.get_rvalue (c_y, NULL), model.get_rvalue (d_y, NULL)); | |
7213 | } | |
7214 | ||
757bf1df DM |
7215 | /* Verify the details of pushing and popping stack frames. */ |
7216 | ||
7217 | static void | |
7218 | test_stack_frames () | |
7219 | { | |
7220 | tree int_42 = build_int_cst (integer_type_node, 42); | |
7221 | tree int_10 = build_int_cst (integer_type_node, 10); | |
7222 | tree int_5 = build_int_cst (integer_type_node, 5); | |
7223 | tree int_0 = build_int_cst (integer_type_node, 0); | |
7224 | ||
7225 | auto_vec <tree> param_types; | |
7226 | tree parent_fndecl = make_fndecl (integer_type_node, | |
7227 | "parent_fn", | |
7228 | param_types); | |
7229 | allocate_struct_function (parent_fndecl, true); | |
7230 | ||
7231 | tree child_fndecl = make_fndecl (integer_type_node, | |
7232 | "child_fn", | |
7233 | param_types); | |
7234 | allocate_struct_function (child_fndecl, true); | |
7235 | ||
7236 | /* "a" and "b" in the parent frame. */ | |
7237 | tree a = build_decl (UNKNOWN_LOCATION, PARM_DECL, | |
7238 | get_identifier ("a"), | |
7239 | integer_type_node); | |
4cebae09 | 7240 | DECL_CONTEXT (a) = parent_fndecl; |
757bf1df DM |
7241 | tree b = build_decl (UNKNOWN_LOCATION, PARM_DECL, |
7242 | get_identifier ("b"), | |
7243 | integer_type_node); | |
4cebae09 | 7244 | DECL_CONTEXT (b) = parent_fndecl; |
757bf1df DM |
7245 | /* "x" and "y" in a child frame. */ |
7246 | tree x = build_decl (UNKNOWN_LOCATION, PARM_DECL, | |
7247 | get_identifier ("x"), | |
7248 | integer_type_node); | |
4cebae09 | 7249 | DECL_CONTEXT (x) = child_fndecl; |
757bf1df DM |
7250 | tree y = build_decl (UNKNOWN_LOCATION, PARM_DECL, |
7251 | get_identifier ("y"), | |
7252 | integer_type_node); | |
4cebae09 | 7253 | DECL_CONTEXT (y) = child_fndecl; |
757bf1df DM |
7254 | |
7255 | /* "p" global. */ | |
7256 | tree p = build_global_decl ("p", ptr_type_node); | |
7257 | ||
7258 | /* "q" global. */ | |
7259 | tree q = build_global_decl ("q", ptr_type_node); | |
7260 | ||
808f4dfe | 7261 | region_model_manager mgr; |
757bf1df | 7262 | test_region_model_context ctxt; |
808f4dfe | 7263 | region_model model (&mgr); |
757bf1df DM |
7264 | |
7265 | /* Push stack frame for "parent_fn". */ | |
808f4dfe DM |
7266 | const region *parent_frame_reg |
7267 | = model.push_frame (DECL_STRUCT_FUNCTION (parent_fndecl), | |
7268 | NULL, &ctxt); | |
7269 | ASSERT_EQ (model.get_current_frame (), parent_frame_reg); | |
7270 | ASSERT_TRUE (model.region_exists_p (parent_frame_reg)); | |
7271 | const region *a_in_parent_reg = model.get_lvalue (a, &ctxt); | |
7272 | model.set_value (a_in_parent_reg, | |
7273 | model.get_rvalue (int_42, &ctxt), | |
7274 | &ctxt); | |
7275 | ASSERT_EQ (a_in_parent_reg->maybe_get_frame_region (), parent_frame_reg); | |
7276 | ||
757bf1df DM |
7277 | model.add_constraint (b, LT_EXPR, int_10, &ctxt); |
7278 | ASSERT_EQ (model.eval_condition (b, LT_EXPR, int_10, &ctxt), | |
7279 | tristate (tristate::TS_TRUE)); | |
7280 | ||
7281 | /* Push stack frame for "child_fn". */ | |
808f4dfe | 7282 | const region *child_frame_reg |
757bf1df | 7283 | = model.push_frame (DECL_STRUCT_FUNCTION (child_fndecl), NULL, &ctxt); |
808f4dfe DM |
7284 | ASSERT_EQ (model.get_current_frame (), child_frame_reg); |
7285 | ASSERT_TRUE (model.region_exists_p (child_frame_reg)); | |
7286 | const region *x_in_child_reg = model.get_lvalue (x, &ctxt); | |
7287 | model.set_value (x_in_child_reg, | |
7288 | model.get_rvalue (int_0, &ctxt), | |
7289 | &ctxt); | |
7290 | ASSERT_EQ (x_in_child_reg->maybe_get_frame_region (), child_frame_reg); | |
7291 | ||
757bf1df DM |
7292 | model.add_constraint (y, NE_EXPR, int_5, &ctxt); |
7293 | ASSERT_EQ (model.eval_condition (y, NE_EXPR, int_5, &ctxt), | |
7294 | tristate (tristate::TS_TRUE)); | |
7295 | ||
7296 | /* Point a global pointer at a local in the child frame: p = &x. */ | |
808f4dfe DM |
7297 | const region *p_in_globals_reg = model.get_lvalue (p, &ctxt); |
7298 | model.set_value (p_in_globals_reg, | |
7299 | mgr.get_ptr_svalue (ptr_type_node, x_in_child_reg), | |
757bf1df | 7300 | &ctxt); |
808f4dfe | 7301 | ASSERT_EQ (p_in_globals_reg->maybe_get_frame_region (), NULL); |
757bf1df DM |
7302 | |
7303 | /* Point another global pointer at p: q = &p. */ | |
808f4dfe DM |
7304 | const region *q_in_globals_reg = model.get_lvalue (q, &ctxt); |
7305 | model.set_value (q_in_globals_reg, | |
7306 | mgr.get_ptr_svalue (ptr_type_node, p_in_globals_reg), | |
757bf1df DM |
7307 | &ctxt); |
7308 | ||
808f4dfe DM |
7309 | /* Test region::descendent_of_p. */ |
7310 | ASSERT_TRUE (child_frame_reg->descendent_of_p (child_frame_reg)); | |
7311 | ASSERT_TRUE (x_in_child_reg->descendent_of_p (child_frame_reg)); | |
7312 | ASSERT_FALSE (a_in_parent_reg->descendent_of_p (child_frame_reg)); | |
757bf1df DM |
7313 | |
7314 | /* Pop the "child_fn" frame from the stack. */ | |
808f4dfe DM |
7315 | model.pop_frame (NULL, NULL, &ctxt); |
7316 | ASSERT_FALSE (model.region_exists_p (child_frame_reg)); | |
7317 | ASSERT_TRUE (model.region_exists_p (parent_frame_reg)); | |
757bf1df DM |
7318 | |
7319 | /* Verify that p (which was pointing at the local "x" in the popped | |
7320 | frame) has been poisoned. */ | |
33255ad3 | 7321 | const svalue *new_p_sval = model.get_rvalue (p, NULL); |
757bf1df DM |
7322 | ASSERT_EQ (new_p_sval->get_kind (), SK_POISONED); |
7323 | ASSERT_EQ (new_p_sval->dyn_cast_poisoned_svalue ()->get_poison_kind (), | |
7324 | POISON_KIND_POPPED_STACK); | |
7325 | ||
7326 | /* Verify that q still points to p, in spite of the region | |
7327 | renumbering. */ | |
808f4dfe | 7328 | const svalue *new_q_sval = model.get_rvalue (q, &ctxt); |
757bf1df | 7329 | ASSERT_EQ (new_q_sval->get_kind (), SK_REGION); |
5932dd35 | 7330 | ASSERT_EQ (new_q_sval->maybe_get_region (), |
757bf1df DM |
7331 | model.get_lvalue (p, &ctxt)); |
7332 | ||
7333 | /* Verify that top of stack has been updated. */ | |
808f4dfe | 7334 | ASSERT_EQ (model.get_current_frame (), parent_frame_reg); |
757bf1df DM |
7335 | |
7336 | /* Verify locals in parent frame. */ | |
7337 | /* Verify "a" still has its value. */ | |
808f4dfe | 7338 | const svalue *new_a_sval = model.get_rvalue (a, &ctxt); |
757bf1df DM |
7339 | ASSERT_EQ (new_a_sval->get_kind (), SK_CONSTANT); |
7340 | ASSERT_EQ (new_a_sval->dyn_cast_constant_svalue ()->get_constant (), | |
7341 | int_42); | |
7342 | /* Verify "b" still has its constraint. */ | |
7343 | ASSERT_EQ (model.eval_condition (b, LT_EXPR, int_10, &ctxt), | |
7344 | tristate (tristate::TS_TRUE)); | |
7345 | } | |
7346 | ||
7347 | /* Verify that get_representative_path_var works as expected, that | |
808f4dfe | 7348 | we can map from regions to parms and back within a recursive call |
757bf1df DM |
7349 | stack. */ |
7350 | ||
7351 | static void | |
7352 | test_get_representative_path_var () | |
7353 | { | |
7354 | auto_vec <tree> param_types; | |
7355 | tree fndecl = make_fndecl (integer_type_node, | |
7356 | "factorial", | |
7357 | param_types); | |
7358 | allocate_struct_function (fndecl, true); | |
7359 | ||
7360 | /* Parm "n". */ | |
7361 | tree n = build_decl (UNKNOWN_LOCATION, PARM_DECL, | |
7362 | get_identifier ("n"), | |
7363 | integer_type_node); | |
4cebae09 | 7364 | DECL_CONTEXT (n) = fndecl; |
757bf1df | 7365 | |
808f4dfe DM |
7366 | region_model_manager mgr; |
7367 | test_region_model_context ctxt; | |
7368 | region_model model (&mgr); | |
757bf1df DM |
7369 | |
7370 | /* Push 5 stack frames for "factorial", each with a param */ | |
808f4dfe DM |
7371 | auto_vec<const region *> parm_regs; |
7372 | auto_vec<const svalue *> parm_svals; | |
757bf1df DM |
7373 | for (int depth = 0; depth < 5; depth++) |
7374 | { | |
808f4dfe DM |
7375 | const region *frame_n_reg |
7376 | = model.push_frame (DECL_STRUCT_FUNCTION (fndecl), NULL, &ctxt); | |
7377 | const region *parm_n_reg = model.get_lvalue (path_var (n, depth), &ctxt); | |
7378 | parm_regs.safe_push (parm_n_reg); | |
757bf1df | 7379 | |
808f4dfe DM |
7380 | ASSERT_EQ (parm_n_reg->get_parent_region (), frame_n_reg); |
7381 | const svalue *sval_n = mgr.get_or_create_initial_value (parm_n_reg); | |
7382 | parm_svals.safe_push (sval_n); | |
757bf1df DM |
7383 | } |
7384 | ||
7385 | /* Verify that we can recognize that the regions are the parms, | |
7386 | at every depth. */ | |
7387 | for (int depth = 0; depth < 5; depth++) | |
7388 | { | |
808f4dfe DM |
7389 | { |
7390 | svalue_set visited; | |
7391 | ASSERT_EQ (model.get_representative_path_var (parm_regs[depth], | |
7392 | &visited), | |
7393 | path_var (n, depth + 1)); | |
7394 | } | |
757bf1df DM |
7395 | /* ...and that we can lookup lvalues for locals for all frames, |
7396 | not just the top. */ | |
7397 | ASSERT_EQ (model.get_lvalue (path_var (n, depth), NULL), | |
808f4dfe | 7398 | parm_regs[depth]); |
757bf1df | 7399 | /* ...and that we can locate the svalues. */ |
808f4dfe DM |
7400 | { |
7401 | svalue_set visited; | |
7402 | ASSERT_EQ (model.get_representative_path_var (parm_svals[depth], | |
7403 | &visited), | |
7404 | path_var (n, depth + 1)); | |
7405 | } | |
757bf1df DM |
7406 | } |
7407 | } | |
7408 | ||
808f4dfe | 7409 | /* Ensure that region_model::operator== works as expected. */ |
757bf1df DM |
7410 | |
7411 | static void | |
808f4dfe | 7412 | test_equality_1 () |
757bf1df | 7413 | { |
808f4dfe DM |
7414 | tree int_42 = build_int_cst (integer_type_node, 42); |
7415 | tree int_17 = build_int_cst (integer_type_node, 17); | |
757bf1df | 7416 | |
808f4dfe DM |
7417 | /* Verify that "empty" region_model instances are equal to each other. */ |
7418 | region_model_manager mgr; | |
7419 | region_model model0 (&mgr); | |
7420 | region_model model1 (&mgr); | |
757bf1df | 7421 | ASSERT_EQ (model0, model1); |
808f4dfe DM |
7422 | |
7423 | /* Verify that setting state in model1 makes the models non-equal. */ | |
7424 | tree x = build_global_decl ("x", integer_type_node); | |
7425 | model0.set_value (x, int_42, NULL); | |
7426 | ASSERT_EQ (model0.get_rvalue (x, NULL)->maybe_get_constant (), int_42); | |
7427 | ASSERT_NE (model0, model1); | |
7428 | ||
7429 | /* Verify the copy-ctor. */ | |
7430 | region_model model2 (model0); | |
7431 | ASSERT_EQ (model0, model2); | |
7432 | ASSERT_EQ (model2.get_rvalue (x, NULL)->maybe_get_constant (), int_42); | |
7433 | ASSERT_NE (model1, model2); | |
7434 | ||
7435 | /* Verify that models obtained from copy-ctor are independently editable | |
7436 | w/o affecting the original model. */ | |
7437 | model2.set_value (x, int_17, NULL); | |
7438 | ASSERT_NE (model0, model2); | |
7439 | ASSERT_EQ (model2.get_rvalue (x, NULL)->maybe_get_constant (), int_17); | |
7440 | ASSERT_EQ (model0.get_rvalue (x, NULL)->maybe_get_constant (), int_42); | |
757bf1df DM |
7441 | } |
7442 | ||
7443 | /* Verify that region models for | |
7444 | x = 42; y = 113; | |
7445 | and | |
7446 | y = 113; x = 42; | |
808f4dfe | 7447 | are equal. */ |
757bf1df DM |
7448 | |
7449 | static void | |
7450 | test_canonicalization_2 () | |
7451 | { | |
7452 | tree int_42 = build_int_cst (integer_type_node, 42); | |
7453 | tree int_113 = build_int_cst (integer_type_node, 113); | |
7454 | tree x = build_global_decl ("x", integer_type_node); | |
7455 | tree y = build_global_decl ("y", integer_type_node); | |
7456 | ||
808f4dfe DM |
7457 | region_model_manager mgr; |
7458 | region_model model0 (&mgr); | |
757bf1df DM |
7459 | model0.set_value (model0.get_lvalue (x, NULL), |
7460 | model0.get_rvalue (int_42, NULL), | |
7461 | NULL); | |
7462 | model0.set_value (model0.get_lvalue (y, NULL), | |
7463 | model0.get_rvalue (int_113, NULL), | |
7464 | NULL); | |
7465 | ||
808f4dfe | 7466 | region_model model1 (&mgr); |
757bf1df DM |
7467 | model1.set_value (model1.get_lvalue (y, NULL), |
7468 | model1.get_rvalue (int_113, NULL), | |
7469 | NULL); | |
7470 | model1.set_value (model1.get_lvalue (x, NULL), | |
7471 | model1.get_rvalue (int_42, NULL), | |
7472 | NULL); | |
7473 | ||
757bf1df DM |
7474 | ASSERT_EQ (model0, model1); |
7475 | } | |
7476 | ||
7477 | /* Verify that constraints for | |
7478 | x > 3 && y > 42 | |
7479 | and | |
7480 | y > 42 && x > 3 | |
7481 | are equal after canonicalization. */ | |
7482 | ||
7483 | static void | |
7484 | test_canonicalization_3 () | |
7485 | { | |
7486 | tree int_3 = build_int_cst (integer_type_node, 3); | |
7487 | tree int_42 = build_int_cst (integer_type_node, 42); | |
7488 | tree x = build_global_decl ("x", integer_type_node); | |
7489 | tree y = build_global_decl ("y", integer_type_node); | |
7490 | ||
808f4dfe DM |
7491 | region_model_manager mgr; |
7492 | region_model model0 (&mgr); | |
757bf1df DM |
7493 | model0.add_constraint (x, GT_EXPR, int_3, NULL); |
7494 | model0.add_constraint (y, GT_EXPR, int_42, NULL); | |
7495 | ||
808f4dfe | 7496 | region_model model1 (&mgr); |
757bf1df DM |
7497 | model1.add_constraint (y, GT_EXPR, int_42, NULL); |
7498 | model1.add_constraint (x, GT_EXPR, int_3, NULL); | |
7499 | ||
808f4dfe DM |
7500 | model0.canonicalize (); |
7501 | model1.canonicalize (); | |
757bf1df DM |
7502 | ASSERT_EQ (model0, model1); |
7503 | } | |
7504 | ||
8c08c983 DM |
7505 | /* Verify that we can canonicalize a model containing NaN and other real |
7506 | constants. */ | |
7507 | ||
7508 | static void | |
7509 | test_canonicalization_4 () | |
7510 | { | |
7511 | auto_vec<tree> csts; | |
7512 | append_interesting_constants (&csts); | |
7513 | ||
808f4dfe DM |
7514 | region_model_manager mgr; |
7515 | region_model model (&mgr); | |
8c08c983 | 7516 | |
3f207ab3 | 7517 | for (tree cst : csts) |
8c08c983 DM |
7518 | model.get_rvalue (cst, NULL); |
7519 | ||
808f4dfe | 7520 | model.canonicalize (); |
8c08c983 DM |
7521 | } |
7522 | ||
757bf1df DM |
7523 | /* Assert that if we have two region_model instances |
7524 | with values VAL_A and VAL_B for EXPR that they are | |
7525 | mergable. Write the merged model to *OUT_MERGED_MODEL, | |
7526 | and the merged svalue ptr to *OUT_MERGED_SVALUE. | |
7527 | If VAL_A or VAL_B are NULL_TREE, don't populate EXPR | |
7528 | for that region_model. */ | |
7529 | ||
7530 | static void | |
7531 | assert_region_models_merge (tree expr, tree val_a, tree val_b, | |
808f4dfe DM |
7532 | region_model *out_merged_model, |
7533 | const svalue **out_merged_svalue) | |
757bf1df | 7534 | { |
808f4dfe | 7535 | region_model_manager *mgr = out_merged_model->get_manager (); |
bb8e93eb DM |
7536 | program_point point (program_point::origin (*mgr)); |
7537 | test_region_model_context ctxt; | |
808f4dfe DM |
7538 | region_model model0 (mgr); |
7539 | region_model model1 (mgr); | |
757bf1df DM |
7540 | if (val_a) |
7541 | model0.set_value (model0.get_lvalue (expr, &ctxt), | |
7542 | model0.get_rvalue (val_a, &ctxt), | |
7543 | &ctxt); | |
7544 | if (val_b) | |
7545 | model1.set_value (model1.get_lvalue (expr, &ctxt), | |
7546 | model1.get_rvalue (val_b, &ctxt), | |
7547 | &ctxt); | |
7548 | ||
7549 | /* They should be mergeable. */ | |
808f4dfe DM |
7550 | ASSERT_TRUE (model0.can_merge_with_p (model1, point, out_merged_model)); |
7551 | *out_merged_svalue = out_merged_model->get_rvalue (expr, &ctxt); | |
757bf1df DM |
7552 | } |
7553 | ||
7554 | /* Verify that we can merge region_model instances. */ | |
7555 | ||
7556 | static void | |
7557 | test_state_merging () | |
7558 | { | |
7559 | tree int_42 = build_int_cst (integer_type_node, 42); | |
7560 | tree int_113 = build_int_cst (integer_type_node, 113); | |
7561 | tree x = build_global_decl ("x", integer_type_node); | |
7562 | tree y = build_global_decl ("y", integer_type_node); | |
7563 | tree z = build_global_decl ("z", integer_type_node); | |
7564 | tree p = build_global_decl ("p", ptr_type_node); | |
7565 | ||
7566 | tree addr_of_y = build1 (ADDR_EXPR, ptr_type_node, y); | |
7567 | tree addr_of_z = build1 (ADDR_EXPR, ptr_type_node, z); | |
7568 | ||
7569 | auto_vec <tree> param_types; | |
7570 | tree test_fndecl = make_fndecl (integer_type_node, "test_fn", param_types); | |
7571 | allocate_struct_function (test_fndecl, true); | |
7572 | ||
7573 | /* Param "a". */ | |
7574 | tree a = build_decl (UNKNOWN_LOCATION, PARM_DECL, | |
7575 | get_identifier ("a"), | |
7576 | integer_type_node); | |
4cebae09 | 7577 | DECL_CONTEXT (a) = test_fndecl; |
757bf1df DM |
7578 | tree addr_of_a = build1 (ADDR_EXPR, ptr_type_node, a); |
7579 | ||
455f58ec DM |
7580 | /* Param "q", a pointer. */ |
7581 | tree q = build_decl (UNKNOWN_LOCATION, PARM_DECL, | |
7582 | get_identifier ("q"), | |
7583 | ptr_type_node); | |
4cebae09 | 7584 | DECL_CONTEXT (q) = test_fndecl; |
455f58ec | 7585 | |
808f4dfe | 7586 | region_model_manager mgr; |
bb8e93eb | 7587 | program_point point (program_point::origin (mgr)); |
808f4dfe | 7588 | |
757bf1df | 7589 | { |
808f4dfe DM |
7590 | region_model model0 (&mgr); |
7591 | region_model model1 (&mgr); | |
7592 | region_model merged (&mgr); | |
757bf1df | 7593 | /* Verify empty models can be merged. */ |
808f4dfe | 7594 | ASSERT_TRUE (model0.can_merge_with_p (model1, point, &merged)); |
757bf1df DM |
7595 | ASSERT_EQ (model0, merged); |
7596 | } | |
7597 | ||
7598 | /* Verify that we can merge two contradictory constraints on the | |
7599 | value for a global. */ | |
7600 | /* TODO: verify that the merged model doesn't have a value for | |
7601 | the global */ | |
7602 | { | |
808f4dfe DM |
7603 | region_model model0 (&mgr); |
7604 | region_model model1 (&mgr); | |
7605 | region_model merged (&mgr); | |
757bf1df DM |
7606 | test_region_model_context ctxt; |
7607 | model0.add_constraint (x, EQ_EXPR, int_42, &ctxt); | |
7608 | model1.add_constraint (x, EQ_EXPR, int_113, &ctxt); | |
808f4dfe | 7609 | ASSERT_TRUE (model0.can_merge_with_p (model1, point, &merged)); |
757bf1df DM |
7610 | ASSERT_NE (model0, merged); |
7611 | ASSERT_NE (model1, merged); | |
7612 | } | |
7613 | ||
7614 | /* Verify handling of a PARM_DECL. */ | |
7615 | { | |
7616 | test_region_model_context ctxt; | |
808f4dfe DM |
7617 | region_model model0 (&mgr); |
7618 | region_model model1 (&mgr); | |
757bf1df DM |
7619 | ASSERT_EQ (model0.get_stack_depth (), 0); |
7620 | model0.push_frame (DECL_STRUCT_FUNCTION (test_fndecl), NULL, &ctxt); | |
7621 | ASSERT_EQ (model0.get_stack_depth (), 1); | |
757bf1df DM |
7622 | model1.push_frame (DECL_STRUCT_FUNCTION (test_fndecl), NULL, &ctxt); |
7623 | ||
9d804f9b DM |
7624 | placeholder_svalue test_sval (mgr.alloc_symbol_id (), |
7625 | integer_type_node, "test sval"); | |
808f4dfe DM |
7626 | model0.set_value (model0.get_lvalue (a, &ctxt), &test_sval, &ctxt); |
7627 | model1.set_value (model1.get_lvalue (a, &ctxt), &test_sval, &ctxt); | |
757bf1df DM |
7628 | ASSERT_EQ (model0, model1); |
7629 | ||
757bf1df | 7630 | /* They should be mergeable, and the result should be the same. */ |
808f4dfe DM |
7631 | region_model merged (&mgr); |
7632 | ASSERT_TRUE (model0.can_merge_with_p (model1, point, &merged)); | |
757bf1df | 7633 | ASSERT_EQ (model0, merged); |
808f4dfe DM |
7634 | /* In particular, "a" should have the placeholder value. */ |
7635 | ASSERT_EQ (merged.get_rvalue (a, &ctxt), &test_sval); | |
757bf1df DM |
7636 | } |
7637 | ||
7638 | /* Verify handling of a global. */ | |
7639 | { | |
7640 | test_region_model_context ctxt; | |
808f4dfe DM |
7641 | region_model model0 (&mgr); |
7642 | region_model model1 (&mgr); | |
757bf1df | 7643 | |
9d804f9b DM |
7644 | placeholder_svalue test_sval (mgr.alloc_symbol_id (), |
7645 | integer_type_node, "test sval"); | |
808f4dfe DM |
7646 | model0.set_value (model0.get_lvalue (x, &ctxt), &test_sval, &ctxt); |
7647 | model1.set_value (model1.get_lvalue (x, &ctxt), &test_sval, &ctxt); | |
7648 | ASSERT_EQ (model0, model1); | |
757bf1df DM |
7649 | |
7650 | /* They should be mergeable, and the result should be the same. */ | |
808f4dfe DM |
7651 | region_model merged (&mgr); |
7652 | ASSERT_TRUE (model0.can_merge_with_p (model1, point, &merged)); | |
757bf1df | 7653 | ASSERT_EQ (model0, merged); |
808f4dfe DM |
7654 | /* In particular, "x" should have the placeholder value. */ |
7655 | ASSERT_EQ (merged.get_rvalue (x, &ctxt), &test_sval); | |
757bf1df DM |
7656 | } |
7657 | ||
7658 | /* Use global-handling to verify various combinations of values. */ | |
7659 | ||
7660 | /* Two equal constant values. */ | |
7661 | { | |
808f4dfe DM |
7662 | region_model merged (&mgr); |
7663 | const svalue *merged_x_sval; | |
757bf1df DM |
7664 | assert_region_models_merge (x, int_42, int_42, &merged, &merged_x_sval); |
7665 | ||
7666 | /* In particular, there should be a constant value for "x". */ | |
7667 | ASSERT_EQ (merged_x_sval->get_kind (), SK_CONSTANT); | |
7668 | ASSERT_EQ (merged_x_sval->dyn_cast_constant_svalue ()->get_constant (), | |
7669 | int_42); | |
7670 | } | |
7671 | ||
7672 | /* Two non-equal constant values. */ | |
7673 | { | |
808f4dfe DM |
7674 | region_model merged (&mgr); |
7675 | const svalue *merged_x_sval; | |
757bf1df DM |
7676 | assert_region_models_merge (x, int_42, int_113, &merged, &merged_x_sval); |
7677 | ||
808f4dfe DM |
7678 | /* In particular, there should be a "widening" value for "x". */ |
7679 | ASSERT_EQ (merged_x_sval->get_kind (), SK_WIDENING); | |
757bf1df DM |
7680 | } |
7681 | ||
808f4dfe | 7682 | /* Initial and constant. */ |
757bf1df | 7683 | { |
808f4dfe DM |
7684 | region_model merged (&mgr); |
7685 | const svalue *merged_x_sval; | |
757bf1df DM |
7686 | assert_region_models_merge (x, NULL_TREE, int_113, &merged, &merged_x_sval); |
7687 | ||
7688 | /* In particular, there should be an unknown value for "x". */ | |
7689 | ASSERT_EQ (merged_x_sval->get_kind (), SK_UNKNOWN); | |
7690 | } | |
7691 | ||
808f4dfe | 7692 | /* Constant and initial. */ |
757bf1df | 7693 | { |
808f4dfe DM |
7694 | region_model merged (&mgr); |
7695 | const svalue *merged_x_sval; | |
757bf1df DM |
7696 | assert_region_models_merge (x, int_42, NULL_TREE, &merged, &merged_x_sval); |
7697 | ||
7698 | /* In particular, there should be an unknown value for "x". */ | |
7699 | ASSERT_EQ (merged_x_sval->get_kind (), SK_UNKNOWN); | |
7700 | } | |
7701 | ||
7702 | /* Unknown and constant. */ | |
7703 | // TODO | |
7704 | ||
7705 | /* Pointers: NULL and NULL. */ | |
7706 | // TODO | |
7707 | ||
7708 | /* Pointers: NULL and non-NULL. */ | |
7709 | // TODO | |
7710 | ||
7711 | /* Pointers: non-NULL and non-NULL: ptr to a local. */ | |
7712 | { | |
808f4dfe | 7713 | region_model model0 (&mgr); |
757bf1df | 7714 | model0.push_frame (DECL_STRUCT_FUNCTION (test_fndecl), NULL, NULL); |
757bf1df DM |
7715 | model0.set_value (model0.get_lvalue (p, NULL), |
7716 | model0.get_rvalue (addr_of_a, NULL), NULL); | |
7717 | ||
7718 | region_model model1 (model0); | |
7719 | ASSERT_EQ (model0, model1); | |
7720 | ||
7721 | /* They should be mergeable, and the result should be the same. */ | |
808f4dfe DM |
7722 | region_model merged (&mgr); |
7723 | ASSERT_TRUE (model0.can_merge_with_p (model1, point, &merged)); | |
757bf1df DM |
7724 | ASSERT_EQ (model0, merged); |
7725 | } | |
7726 | ||
7727 | /* Pointers: non-NULL and non-NULL: ptr to a global. */ | |
7728 | { | |
808f4dfe | 7729 | region_model merged (&mgr); |
757bf1df | 7730 | /* p == &y in both input models. */ |
808f4dfe | 7731 | const svalue *merged_p_sval; |
757bf1df DM |
7732 | assert_region_models_merge (p, addr_of_y, addr_of_y, &merged, |
7733 | &merged_p_sval); | |
7734 | ||
7735 | /* We should get p == &y in the merged model. */ | |
7736 | ASSERT_EQ (merged_p_sval->get_kind (), SK_REGION); | |
808f4dfe DM |
7737 | const region_svalue *merged_p_ptr |
7738 | = merged_p_sval->dyn_cast_region_svalue (); | |
7739 | const region *merged_p_star_reg = merged_p_ptr->get_pointee (); | |
7740 | ASSERT_EQ (merged_p_star_reg, merged.get_lvalue (y, NULL)); | |
757bf1df DM |
7741 | } |
7742 | ||
7743 | /* Pointers: non-NULL ptrs to different globals: should be unknown. */ | |
7744 | { | |
808f4dfe DM |
7745 | region_model merged (&mgr); |
7746 | /* x == &y vs x == &z in the input models; these are actually casts | |
7747 | of the ptrs to "int". */ | |
7748 | const svalue *merged_x_sval; | |
7749 | // TODO: | |
757bf1df DM |
7750 | assert_region_models_merge (x, addr_of_y, addr_of_z, &merged, |
7751 | &merged_x_sval); | |
7752 | ||
7753 | /* We should get x == unknown in the merged model. */ | |
7754 | ASSERT_EQ (merged_x_sval->get_kind (), SK_UNKNOWN); | |
7755 | } | |
7756 | ||
7757 | /* Pointers: non-NULL and non-NULL: ptr to a heap region. */ | |
7758 | { | |
7759 | test_region_model_context ctxt; | |
808f4dfe | 7760 | region_model model0 (&mgr); |
9a2c9579 | 7761 | tree size = build_int_cst (size_type_node, 1024); |
808f4dfe | 7762 | const svalue *size_sval = mgr.get_or_create_constant_svalue (size); |
b9365b93 | 7763 | const region *new_reg |
ce917b04 | 7764 | = model0.get_or_create_region_for_heap_alloc (size_sval, &ctxt); |
808f4dfe | 7765 | const svalue *ptr_sval = mgr.get_ptr_svalue (ptr_type_node, new_reg); |
757bf1df | 7766 | model0.set_value (model0.get_lvalue (p, &ctxt), |
808f4dfe | 7767 | ptr_sval, &ctxt); |
757bf1df DM |
7768 | |
7769 | region_model model1 (model0); | |
7770 | ||
7771 | ASSERT_EQ (model0, model1); | |
7772 | ||
808f4dfe DM |
7773 | region_model merged (&mgr); |
7774 | ASSERT_TRUE (model0.can_merge_with_p (model1, point, &merged)); | |
757bf1df | 7775 | |
808f4dfe | 7776 | /* The merged model ought to be identical. */ |
757bf1df DM |
7777 | ASSERT_EQ (model0, merged); |
7778 | } | |
7779 | ||
808f4dfe DM |
7780 | /* Two regions sharing the same placeholder svalue should continue sharing |
7781 | it after self-merger. */ | |
757bf1df DM |
7782 | { |
7783 | test_region_model_context ctxt; | |
808f4dfe | 7784 | region_model model0 (&mgr); |
9d804f9b DM |
7785 | placeholder_svalue placeholder_sval (mgr.alloc_symbol_id (), |
7786 | integer_type_node, "test"); | |
808f4dfe DM |
7787 | model0.set_value (model0.get_lvalue (x, &ctxt), |
7788 | &placeholder_sval, &ctxt); | |
7789 | model0.set_value (model0.get_lvalue (y, &ctxt), &placeholder_sval, &ctxt); | |
757bf1df DM |
7790 | region_model model1 (model0); |
7791 | ||
7792 | /* They should be mergeable, and the result should be the same. */ | |
808f4dfe DM |
7793 | region_model merged (&mgr); |
7794 | ASSERT_TRUE (model0.can_merge_with_p (model1, point, &merged)); | |
757bf1df DM |
7795 | ASSERT_EQ (model0, merged); |
7796 | ||
7797 | /* In particular, we should have x == y. */ | |
7798 | ASSERT_EQ (merged.eval_condition (x, EQ_EXPR, y, &ctxt), | |
7799 | tristate (tristate::TS_TRUE)); | |
7800 | } | |
7801 | ||
757bf1df | 7802 | { |
808f4dfe DM |
7803 | region_model model0 (&mgr); |
7804 | region_model model1 (&mgr); | |
757bf1df DM |
7805 | test_region_model_context ctxt; |
7806 | model0.add_constraint (x, EQ_EXPR, int_42, &ctxt); | |
7807 | model1.add_constraint (x, NE_EXPR, int_42, &ctxt); | |
808f4dfe DM |
7808 | region_model merged (&mgr); |
7809 | ASSERT_TRUE (model0.can_merge_with_p (model1, point, &merged)); | |
757bf1df DM |
7810 | } |
7811 | ||
7812 | { | |
808f4dfe DM |
7813 | region_model model0 (&mgr); |
7814 | region_model model1 (&mgr); | |
757bf1df DM |
7815 | test_region_model_context ctxt; |
7816 | model0.add_constraint (x, EQ_EXPR, int_42, &ctxt); | |
7817 | model1.add_constraint (x, NE_EXPR, int_42, &ctxt); | |
7818 | model1.add_constraint (x, EQ_EXPR, int_113, &ctxt); | |
808f4dfe DM |
7819 | region_model merged (&mgr); |
7820 | ASSERT_TRUE (model0.can_merge_with_p (model1, point, &merged)); | |
757bf1df | 7821 | } |
757bf1df DM |
7822 | |
7823 | // TODO: what can't we merge? need at least one such test | |
7824 | ||
7825 | /* TODO: various things | |
7826 | - heap regions | |
7827 | - value merging: | |
7828 | - every combination, but in particular | |
808f4dfe | 7829 | - pairs of regions |
757bf1df DM |
7830 | */ |
7831 | ||
7832 | /* Views. */ | |
7833 | { | |
7834 | test_region_model_context ctxt; | |
808f4dfe | 7835 | region_model model0 (&mgr); |
757bf1df | 7836 | |
808f4dfe DM |
7837 | const region *x_reg = model0.get_lvalue (x, &ctxt); |
7838 | const region *x_as_ptr = mgr.get_cast_region (x_reg, ptr_type_node); | |
757bf1df DM |
7839 | model0.set_value (x_as_ptr, model0.get_rvalue (addr_of_y, &ctxt), &ctxt); |
7840 | ||
7841 | region_model model1 (model0); | |
7842 | ASSERT_EQ (model1, model0); | |
7843 | ||
7844 | /* They should be mergeable, and the result should be the same. */ | |
808f4dfe DM |
7845 | region_model merged (&mgr); |
7846 | ASSERT_TRUE (model0.can_merge_with_p (model1, point, &merged)); | |
757bf1df | 7847 | } |
455f58ec DM |
7848 | |
7849 | /* Verify that we can merge a model in which a local in an older stack | |
7850 | frame points to a local in a more recent stack frame. */ | |
7851 | { | |
808f4dfe | 7852 | region_model model0 (&mgr); |
455f58ec | 7853 | model0.push_frame (DECL_STRUCT_FUNCTION (test_fndecl), NULL, NULL); |
808f4dfe | 7854 | const region *q_in_first_frame = model0.get_lvalue (q, NULL); |
455f58ec DM |
7855 | |
7856 | /* Push a second frame. */ | |
808f4dfe | 7857 | const region *reg_2nd_frame |
455f58ec DM |
7858 | = model0.push_frame (DECL_STRUCT_FUNCTION (test_fndecl), NULL, NULL); |
7859 | ||
7860 | /* Have a pointer in the older frame point to a local in the | |
7861 | more recent frame. */ | |
808f4dfe DM |
7862 | const svalue *sval_ptr = model0.get_rvalue (addr_of_a, NULL); |
7863 | model0.set_value (q_in_first_frame, sval_ptr, NULL); | |
455f58ec DM |
7864 | |
7865 | /* Verify that it's pointing at the newer frame. */ | |
5932dd35 | 7866 | const region *reg_pointee = sval_ptr->maybe_get_region (); |
808f4dfe | 7867 | ASSERT_EQ (reg_pointee->get_parent_region (), reg_2nd_frame); |
455f58ec | 7868 | |
808f4dfe | 7869 | model0.canonicalize (); |
455f58ec DM |
7870 | |
7871 | region_model model1 (model0); | |
7872 | ASSERT_EQ (model0, model1); | |
7873 | ||
7874 | /* They should be mergeable, and the result should be the same | |
7875 | (after canonicalization, at least). */ | |
808f4dfe DM |
7876 | region_model merged (&mgr); |
7877 | ASSERT_TRUE (model0.can_merge_with_p (model1, point, &merged)); | |
7878 | merged.canonicalize (); | |
455f58ec DM |
7879 | ASSERT_EQ (model0, merged); |
7880 | } | |
7881 | ||
7882 | /* Verify that we can merge a model in which a local points to a global. */ | |
7883 | { | |
808f4dfe | 7884 | region_model model0 (&mgr); |
455f58ec DM |
7885 | model0.push_frame (DECL_STRUCT_FUNCTION (test_fndecl), NULL, NULL); |
7886 | model0.set_value (model0.get_lvalue (q, NULL), | |
7887 | model0.get_rvalue (addr_of_y, NULL), NULL); | |
7888 | ||
455f58ec DM |
7889 | region_model model1 (model0); |
7890 | ASSERT_EQ (model0, model1); | |
7891 | ||
7892 | /* They should be mergeable, and the result should be the same | |
7893 | (after canonicalization, at least). */ | |
808f4dfe DM |
7894 | region_model merged (&mgr); |
7895 | ASSERT_TRUE (model0.can_merge_with_p (model1, point, &merged)); | |
455f58ec DM |
7896 | ASSERT_EQ (model0, merged); |
7897 | } | |
757bf1df DM |
7898 | } |
7899 | ||
7900 | /* Verify that constraints are correctly merged when merging region_model | |
7901 | instances. */ | |
7902 | ||
7903 | static void | |
7904 | test_constraint_merging () | |
7905 | { | |
7906 | tree int_0 = build_int_cst (integer_type_node, 0); | |
7907 | tree int_5 = build_int_cst (integer_type_node, 5); | |
7908 | tree x = build_global_decl ("x", integer_type_node); | |
7909 | tree y = build_global_decl ("y", integer_type_node); | |
7910 | tree z = build_global_decl ("z", integer_type_node); | |
7911 | tree n = build_global_decl ("n", integer_type_node); | |
7912 | ||
808f4dfe | 7913 | region_model_manager mgr; |
757bf1df DM |
7914 | test_region_model_context ctxt; |
7915 | ||
7916 | /* model0: 0 <= (x == y) < n. */ | |
808f4dfe | 7917 | region_model model0 (&mgr); |
757bf1df DM |
7918 | model0.add_constraint (x, EQ_EXPR, y, &ctxt); |
7919 | model0.add_constraint (x, GE_EXPR, int_0, NULL); | |
7920 | model0.add_constraint (x, LT_EXPR, n, NULL); | |
7921 | ||
7922 | /* model1: z != 5 && (0 <= x < n). */ | |
808f4dfe | 7923 | region_model model1 (&mgr); |
757bf1df DM |
7924 | model1.add_constraint (z, NE_EXPR, int_5, NULL); |
7925 | model1.add_constraint (x, GE_EXPR, int_0, NULL); | |
7926 | model1.add_constraint (x, LT_EXPR, n, NULL); | |
7927 | ||
7928 | /* They should be mergeable; the merged constraints should | |
7929 | be: (0 <= x < n). */ | |
bb8e93eb | 7930 | program_point point (program_point::origin (mgr)); |
808f4dfe DM |
7931 | region_model merged (&mgr); |
7932 | ASSERT_TRUE (model0.can_merge_with_p (model1, point, &merged)); | |
757bf1df DM |
7933 | |
7934 | ASSERT_EQ (merged.eval_condition (x, GE_EXPR, int_0, &ctxt), | |
7935 | tristate (tristate::TS_TRUE)); | |
7936 | ASSERT_EQ (merged.eval_condition (x, LT_EXPR, n, &ctxt), | |
7937 | tristate (tristate::TS_TRUE)); | |
7938 | ||
7939 | ASSERT_EQ (merged.eval_condition (z, NE_EXPR, int_5, &ctxt), | |
7940 | tristate (tristate::TS_UNKNOWN)); | |
7941 | ASSERT_EQ (merged.eval_condition (x, LT_EXPR, y, &ctxt), | |
7942 | tristate (tristate::TS_UNKNOWN)); | |
7943 | } | |
7944 | ||
808f4dfe DM |
7945 | /* Verify that widening_svalue::eval_condition_without_cm works as |
7946 | expected. */ | |
7947 | ||
7948 | static void | |
7949 | test_widening_constraints () | |
7950 | { | |
bb8e93eb | 7951 | region_model_manager mgr; |
e6fe02d8 | 7952 | function_point point (program_point::origin (mgr).get_function_point ()); |
808f4dfe DM |
7953 | tree int_0 = build_int_cst (integer_type_node, 0); |
7954 | tree int_m1 = build_int_cst (integer_type_node, -1); | |
7955 | tree int_1 = build_int_cst (integer_type_node, 1); | |
7956 | tree int_256 = build_int_cst (integer_type_node, 256); | |
808f4dfe DM |
7957 | test_region_model_context ctxt; |
7958 | const svalue *int_0_sval = mgr.get_or_create_constant_svalue (int_0); | |
7959 | const svalue *int_1_sval = mgr.get_or_create_constant_svalue (int_1); | |
7960 | const svalue *w_zero_then_one_sval | |
7961 | = mgr.get_or_create_widening_svalue (integer_type_node, point, | |
7962 | int_0_sval, int_1_sval); | |
7963 | const widening_svalue *w_zero_then_one | |
7964 | = w_zero_then_one_sval->dyn_cast_widening_svalue (); | |
7965 | ASSERT_EQ (w_zero_then_one->get_direction (), | |
7966 | widening_svalue::DIR_ASCENDING); | |
7967 | ASSERT_EQ (w_zero_then_one->eval_condition_without_cm (LT_EXPR, int_m1), | |
7968 | tristate::TS_FALSE); | |
7969 | ASSERT_EQ (w_zero_then_one->eval_condition_without_cm (LT_EXPR, int_0), | |
7970 | tristate::TS_FALSE); | |
7971 | ASSERT_EQ (w_zero_then_one->eval_condition_without_cm (LT_EXPR, int_1), | |
7972 | tristate::TS_UNKNOWN); | |
7973 | ASSERT_EQ (w_zero_then_one->eval_condition_without_cm (LT_EXPR, int_256), | |
7974 | tristate::TS_UNKNOWN); | |
7975 | ||
7976 | ASSERT_EQ (w_zero_then_one->eval_condition_without_cm (LE_EXPR, int_m1), | |
7977 | tristate::TS_FALSE); | |
7978 | ASSERT_EQ (w_zero_then_one->eval_condition_without_cm (LE_EXPR, int_0), | |
7979 | tristate::TS_UNKNOWN); | |
7980 | ASSERT_EQ (w_zero_then_one->eval_condition_without_cm (LE_EXPR, int_1), | |
7981 | tristate::TS_UNKNOWN); | |
7982 | ASSERT_EQ (w_zero_then_one->eval_condition_without_cm (LE_EXPR, int_256), | |
7983 | tristate::TS_UNKNOWN); | |
7984 | ||
7985 | ASSERT_EQ (w_zero_then_one->eval_condition_without_cm (GT_EXPR, int_m1), | |
7986 | tristate::TS_TRUE); | |
7987 | ASSERT_EQ (w_zero_then_one->eval_condition_without_cm (GT_EXPR, int_0), | |
7988 | tristate::TS_UNKNOWN); | |
7989 | ASSERT_EQ (w_zero_then_one->eval_condition_without_cm (GT_EXPR, int_1), | |
7990 | tristate::TS_UNKNOWN); | |
7991 | ASSERT_EQ (w_zero_then_one->eval_condition_without_cm (GT_EXPR, int_256), | |
7992 | tristate::TS_UNKNOWN); | |
7993 | ||
7994 | ASSERT_EQ (w_zero_then_one->eval_condition_without_cm (GE_EXPR, int_m1), | |
7995 | tristate::TS_TRUE); | |
7996 | ASSERT_EQ (w_zero_then_one->eval_condition_without_cm (GE_EXPR, int_0), | |
7997 | tristate::TS_TRUE); | |
7998 | ASSERT_EQ (w_zero_then_one->eval_condition_without_cm (GE_EXPR, int_1), | |
7999 | tristate::TS_UNKNOWN); | |
8000 | ASSERT_EQ (w_zero_then_one->eval_condition_without_cm (GE_EXPR, int_256), | |
8001 | tristate::TS_UNKNOWN); | |
8002 | ||
8003 | ASSERT_EQ (w_zero_then_one->eval_condition_without_cm (EQ_EXPR, int_m1), | |
8004 | tristate::TS_FALSE); | |
8005 | ASSERT_EQ (w_zero_then_one->eval_condition_without_cm (EQ_EXPR, int_0), | |
8006 | tristate::TS_UNKNOWN); | |
8007 | ASSERT_EQ (w_zero_then_one->eval_condition_without_cm (EQ_EXPR, int_1), | |
8008 | tristate::TS_UNKNOWN); | |
8009 | ASSERT_EQ (w_zero_then_one->eval_condition_without_cm (EQ_EXPR, int_256), | |
8010 | tristate::TS_UNKNOWN); | |
8011 | ||
8012 | ASSERT_EQ (w_zero_then_one->eval_condition_without_cm (NE_EXPR, int_m1), | |
8013 | tristate::TS_TRUE); | |
8014 | ASSERT_EQ (w_zero_then_one->eval_condition_without_cm (NE_EXPR, int_0), | |
8015 | tristate::TS_UNKNOWN); | |
8016 | ASSERT_EQ (w_zero_then_one->eval_condition_without_cm (NE_EXPR, int_1), | |
8017 | tristate::TS_UNKNOWN); | |
8018 | ASSERT_EQ (w_zero_then_one->eval_condition_without_cm (NE_EXPR, int_256), | |
8019 | tristate::TS_UNKNOWN); | |
8020 | } | |
8021 | ||
8022 | /* Verify merging constraints for states simulating successive iterations | |
8023 | of a loop. | |
8024 | Simulate: | |
8025 | for (i = 0; i < 256; i++) | |
8026 | [...body...] | |
8027 | i.e. this gimple:. | |
8028 | i_15 = 0; | |
8029 | goto <bb 4>; | |
8030 | ||
8031 | <bb 4> : | |
8032 | i_11 = PHI <i_15(2), i_23(3)> | |
8033 | if (i_11 <= 255) | |
8034 | goto <bb 3>; | |
8035 | else | |
8036 | goto [AFTER LOOP] | |
8037 | ||
8038 | <bb 3> : | |
8039 | [LOOP BODY] | |
8040 | i_23 = i_11 + 1; | |
8041 | ||
8042 | and thus these ops (and resultant states): | |
8043 | i_11 = PHI() | |
8044 | {i_11: 0} | |
8045 | add_constraint (i_11 <= 255) [for the true edge] | |
8046 | {i_11: 0} [constraint was a no-op] | |
8047 | i_23 = i_11 + 1; | |
8048 | {i_22: 1} | |
8049 | i_11 = PHI() | |
8050 | {i_11: WIDENED (at phi, 0, 1)} | |
8051 | add_constraint (i_11 <= 255) [for the true edge] | |
8052 | {i_11: WIDENED (at phi, 0, 1); WIDENED <= 255} | |
8053 | i_23 = i_11 + 1; | |
8054 | {i_23: (WIDENED (at phi, 0, 1) + 1); WIDENED <= 255} | |
8055 | i_11 = PHI(); merge with state at phi above | |
8056 | {i_11: WIDENED (at phi, 0, 1); WIDENED <= 256} | |
8057 | [changing meaning of "WIDENED" here] | |
8058 | if (i_11 <= 255) | |
8059 | T: {i_11: WIDENED (at phi, 0, 1); WIDENED <= 255}; cache hit | |
8060 | F: {i_11: 256} | |
8061 | */ | |
8062 | ||
8063 | static void | |
8064 | test_iteration_1 () | |
8065 | { | |
bb8e93eb DM |
8066 | region_model_manager mgr; |
8067 | program_point point (program_point::origin (mgr)); | |
808f4dfe DM |
8068 | |
8069 | tree int_0 = build_int_cst (integer_type_node, 0); | |
8070 | tree int_1 = build_int_cst (integer_type_node, 1); | |
8071 | tree int_256 = build_int_cst (integer_type_node, 256); | |
8072 | tree int_257 = build_int_cst (integer_type_node, 257); | |
8073 | tree i = build_global_decl ("i", integer_type_node); | |
8074 | ||
808f4dfe DM |
8075 | test_region_model_context ctxt; |
8076 | ||
8077 | /* model0: i: 0. */ | |
8078 | region_model model0 (&mgr); | |
8079 | model0.set_value (i, int_0, &ctxt); | |
8080 | ||
8081 | /* model1: i: 1. */ | |
8082 | region_model model1 (&mgr); | |
8083 | model1.set_value (i, int_1, &ctxt); | |
8084 | ||
8085 | /* Should merge "i" to a widened value. */ | |
8086 | region_model model2 (&mgr); | |
8087 | ASSERT_TRUE (model1.can_merge_with_p (model0, point, &model2)); | |
8088 | const svalue *merged_i = model2.get_rvalue (i, &ctxt); | |
8089 | ASSERT_EQ (merged_i->get_kind (), SK_WIDENING); | |
8090 | const widening_svalue *w = merged_i->dyn_cast_widening_svalue (); | |
8091 | ASSERT_EQ (w->get_direction (), widening_svalue::DIR_ASCENDING); | |
8092 | ||
8093 | /* Add constraint: i < 256 */ | |
8094 | model2.add_constraint (i, LT_EXPR, int_256, &ctxt); | |
8095 | ASSERT_EQ (model2.eval_condition (i, LT_EXPR, int_256, &ctxt), | |
8096 | tristate (tristate::TS_TRUE)); | |
8097 | ASSERT_EQ (model2.eval_condition (i, GE_EXPR, int_0, &ctxt), | |
8098 | tristate (tristate::TS_TRUE)); | |
8099 | ||
8100 | /* Try merging with the initial state. */ | |
8101 | region_model model3 (&mgr); | |
8102 | ASSERT_TRUE (model2.can_merge_with_p (model0, point, &model3)); | |
8103 | /* Merging the merged value with the initial value should be idempotent, | |
8104 | so that the analysis converges. */ | |
8105 | ASSERT_EQ (model3.get_rvalue (i, &ctxt), merged_i); | |
8106 | /* Merger of 0 and a widening value with constraint < CST | |
8107 | should retain the constraint, even though it was implicit | |
8108 | for the 0 case. */ | |
8109 | ASSERT_EQ (model3.eval_condition (i, LT_EXPR, int_256, &ctxt), | |
8110 | tristate (tristate::TS_TRUE)); | |
8111 | /* ...and we should have equality: the analysis should have converged. */ | |
8112 | ASSERT_EQ (model3, model2); | |
8113 | ||
8114 | /* "i_23 = i_11 + 1;" */ | |
8115 | region_model model4 (model3); | |
8116 | ASSERT_EQ (model4, model2); | |
8117 | model4.set_value (i, build2 (PLUS_EXPR, integer_type_node, i, int_1), &ctxt); | |
8118 | const svalue *plus_one = model4.get_rvalue (i, &ctxt); | |
8119 | ASSERT_EQ (plus_one->get_kind (), SK_BINOP); | |
8120 | ||
8121 | /* Try merging with the "i: 1" state. */ | |
8122 | region_model model5 (&mgr); | |
8123 | ASSERT_TRUE (model4.can_merge_with_p (model1, point, &model5)); | |
8124 | ASSERT_EQ (model5.get_rvalue (i, &ctxt), plus_one); | |
8125 | ASSERT_EQ (model5, model4); | |
8126 | ||
8127 | /* "i_11 = PHI();" merge with state at phi above. | |
8128 | For i, we should have a merger of WIDENING with WIDENING + 1, | |
8129 | and this should be WIDENING again. */ | |
8130 | region_model model6 (&mgr); | |
8131 | ASSERT_TRUE (model5.can_merge_with_p (model2, point, &model6)); | |
8132 | const svalue *merged_widening = model6.get_rvalue (i, &ctxt); | |
8133 | ASSERT_EQ (merged_widening->get_kind (), SK_WIDENING); | |
8134 | ||
8135 | ASSERT_CONDITION_TRUE (model6, i, LT_EXPR, int_257); | |
8136 | } | |
8137 | ||
6969ac30 DM |
8138 | /* Verify that if we mark a pointer to a malloc-ed region as non-NULL, |
8139 | all cast pointers to that region are also known to be non-NULL. */ | |
8140 | ||
8141 | static void | |
8142 | test_malloc_constraints () | |
8143 | { | |
808f4dfe DM |
8144 | region_model_manager mgr; |
8145 | region_model model (&mgr); | |
6969ac30 DM |
8146 | tree p = build_global_decl ("p", ptr_type_node); |
8147 | tree char_star = build_pointer_type (char_type_node); | |
8148 | tree q = build_global_decl ("q", char_star); | |
8149 | tree null_ptr = build_int_cst (ptr_type_node, 0); | |
8150 | ||
808f4dfe | 8151 | const svalue *size_in_bytes |
9a2c9579 | 8152 | = mgr.get_or_create_unknown_svalue (size_type_node); |
ce917b04 DM |
8153 | const region *reg |
8154 | = model.get_or_create_region_for_heap_alloc (size_in_bytes, NULL); | |
808f4dfe DM |
8155 | const svalue *sval = mgr.get_ptr_svalue (ptr_type_node, reg); |
8156 | model.set_value (model.get_lvalue (p, NULL), sval, NULL); | |
6969ac30 DM |
8157 | model.set_value (q, p, NULL); |
8158 | ||
6969ac30 DM |
8159 | ASSERT_CONDITION_UNKNOWN (model, p, NE_EXPR, null_ptr); |
8160 | ASSERT_CONDITION_UNKNOWN (model, p, EQ_EXPR, null_ptr); | |
8161 | ASSERT_CONDITION_UNKNOWN (model, q, NE_EXPR, null_ptr); | |
8162 | ASSERT_CONDITION_UNKNOWN (model, q, EQ_EXPR, null_ptr); | |
8163 | ||
8164 | model.add_constraint (p, NE_EXPR, null_ptr, NULL); | |
8165 | ||
6969ac30 DM |
8166 | ASSERT_CONDITION_TRUE (model, p, NE_EXPR, null_ptr); |
8167 | ASSERT_CONDITION_FALSE (model, p, EQ_EXPR, null_ptr); | |
8168 | ASSERT_CONDITION_TRUE (model, q, NE_EXPR, null_ptr); | |
8169 | ASSERT_CONDITION_FALSE (model, q, EQ_EXPR, null_ptr); | |
8170 | } | |
8171 | ||
808f4dfe DM |
8172 | /* Smoketest of getting and setting the value of a variable. */ |
8173 | ||
8174 | static void | |
8175 | test_var () | |
8176 | { | |
8177 | /* "int i;" */ | |
8178 | tree i = build_global_decl ("i", integer_type_node); | |
8179 | ||
8180 | tree int_17 = build_int_cst (integer_type_node, 17); | |
8181 | tree int_m3 = build_int_cst (integer_type_node, -3); | |
8182 | ||
8183 | region_model_manager mgr; | |
8184 | region_model model (&mgr); | |
8185 | ||
8186 | const region *i_reg = model.get_lvalue (i, NULL); | |
8187 | ASSERT_EQ (i_reg->get_kind (), RK_DECL); | |
8188 | ||
8189 | /* Reading "i" should give a symbolic "initial value". */ | |
8190 | const svalue *sval_init = model.get_rvalue (i, NULL); | |
8191 | ASSERT_EQ (sval_init->get_kind (), SK_INITIAL); | |
8192 | ASSERT_EQ (sval_init->dyn_cast_initial_svalue ()->get_region (), i_reg); | |
8193 | /* ..and doing it again should give the same "initial value". */ | |
8194 | ASSERT_EQ (model.get_rvalue (i, NULL), sval_init); | |
8195 | ||
8196 | /* "i = 17;". */ | |
8197 | model.set_value (i, int_17, NULL); | |
8198 | ASSERT_EQ (model.get_rvalue (i, NULL), | |
8199 | model.get_rvalue (int_17, NULL)); | |
8200 | ||
8201 | /* "i = -3;". */ | |
8202 | model.set_value (i, int_m3, NULL); | |
8203 | ASSERT_EQ (model.get_rvalue (i, NULL), | |
8204 | model.get_rvalue (int_m3, NULL)); | |
8205 | ||
8206 | /* Verify get_offset for "i". */ | |
8207 | { | |
7a6564c9 | 8208 | region_offset offset = i_reg->get_offset (&mgr); |
808f4dfe DM |
8209 | ASSERT_EQ (offset.get_base_region (), i_reg); |
8210 | ASSERT_EQ (offset.get_bit_offset (), 0); | |
8211 | } | |
8212 | } | |
8213 | ||
8214 | static void | |
8215 | test_array_2 () | |
8216 | { | |
8217 | /* "int arr[10];" */ | |
8218 | tree tlen = size_int (10); | |
8219 | tree arr_type | |
8220 | = build_array_type (integer_type_node, build_index_type (tlen)); | |
8221 | tree arr = build_global_decl ("arr", arr_type); | |
8222 | ||
8223 | /* "int i;" */ | |
8224 | tree i = build_global_decl ("i", integer_type_node); | |
8225 | ||
8226 | tree int_0 = build_int_cst (integer_type_node, 0); | |
8227 | tree int_1 = build_int_cst (integer_type_node, 1); | |
8228 | ||
8229 | tree arr_0 = build4 (ARRAY_REF, integer_type_node, | |
8230 | arr, int_0, NULL_TREE, NULL_TREE); | |
8231 | tree arr_1 = build4 (ARRAY_REF, integer_type_node, | |
8232 | arr, int_1, NULL_TREE, NULL_TREE); | |
8233 | tree arr_i = build4 (ARRAY_REF, integer_type_node, | |
8234 | arr, i, NULL_TREE, NULL_TREE); | |
8235 | ||
8236 | tree int_17 = build_int_cst (integer_type_node, 17); | |
8237 | tree int_42 = build_int_cst (integer_type_node, 42); | |
8238 | tree int_m3 = build_int_cst (integer_type_node, -3); | |
8239 | ||
8240 | region_model_manager mgr; | |
8241 | region_model model (&mgr); | |
8242 | /* "arr[0] = 17;". */ | |
8243 | model.set_value (arr_0, int_17, NULL); | |
8244 | /* "arr[1] = -3;". */ | |
8245 | model.set_value (arr_1, int_m3, NULL); | |
8246 | ||
8247 | ASSERT_EQ (model.get_rvalue (arr_0, NULL), model.get_rvalue (int_17, NULL)); | |
8248 | ASSERT_EQ (model.get_rvalue (arr_1, NULL), model.get_rvalue (int_m3, NULL)); | |
8249 | ||
8250 | /* Overwrite a pre-existing binding: "arr[1] = 42;". */ | |
8251 | model.set_value (arr_1, int_42, NULL); | |
8252 | ASSERT_EQ (model.get_rvalue (arr_1, NULL), model.get_rvalue (int_42, NULL)); | |
8253 | ||
8254 | /* Verify get_offset for "arr[0]". */ | |
8255 | { | |
8256 | const region *arr_0_reg = model.get_lvalue (arr_0, NULL); | |
7a6564c9 | 8257 | region_offset offset = arr_0_reg->get_offset (&mgr); |
808f4dfe DM |
8258 | ASSERT_EQ (offset.get_base_region (), model.get_lvalue (arr, NULL)); |
8259 | ASSERT_EQ (offset.get_bit_offset (), 0); | |
8260 | } | |
8261 | ||
8262 | /* Verify get_offset for "arr[1]". */ | |
8263 | { | |
8264 | const region *arr_1_reg = model.get_lvalue (arr_1, NULL); | |
7a6564c9 | 8265 | region_offset offset = arr_1_reg->get_offset (&mgr); |
808f4dfe DM |
8266 | ASSERT_EQ (offset.get_base_region (), model.get_lvalue (arr, NULL)); |
8267 | ASSERT_EQ (offset.get_bit_offset (), INT_TYPE_SIZE); | |
8268 | } | |
8269 | ||
7a6564c9 TL |
8270 | /* Verify get_offset for "arr[i]". */ |
8271 | { | |
8272 | const region *arr_i_reg = model.get_lvalue (arr_i, NULL); | |
8273 | region_offset offset = arr_i_reg->get_offset (&mgr); | |
8274 | ASSERT_EQ (offset.get_base_region (), model.get_lvalue (arr, NULL)); | |
8275 | ASSERT_EQ (offset.get_symbolic_byte_offset ()->get_kind (), SK_BINOP); | |
8276 | } | |
8277 | ||
808f4dfe DM |
8278 | /* "arr[i] = i;" - this should remove the earlier bindings. */ |
8279 | model.set_value (arr_i, i, NULL); | |
8280 | ASSERT_EQ (model.get_rvalue (arr_i, NULL), model.get_rvalue (i, NULL)); | |
8281 | ASSERT_EQ (model.get_rvalue (arr_0, NULL)->get_kind (), SK_UNKNOWN); | |
8282 | ||
8283 | /* "arr[0] = 17;" - this should remove the arr[i] binding. */ | |
8284 | model.set_value (arr_0, int_17, NULL); | |
8285 | ASSERT_EQ (model.get_rvalue (arr_0, NULL), model.get_rvalue (int_17, NULL)); | |
8286 | ASSERT_EQ (model.get_rvalue (arr_i, NULL)->get_kind (), SK_UNKNOWN); | |
8287 | } | |
8288 | ||
8289 | /* Smoketest of dereferencing a pointer via MEM_REF. */ | |
8290 | ||
8291 | static void | |
8292 | test_mem_ref () | |
8293 | { | |
8294 | /* | |
8295 | x = 17; | |
8296 | p = &x; | |
8297 | *p; | |
8298 | */ | |
8299 | tree x = build_global_decl ("x", integer_type_node); | |
8300 | tree int_star = build_pointer_type (integer_type_node); | |
8301 | tree p = build_global_decl ("p", int_star); | |
8302 | ||
8303 | tree int_17 = build_int_cst (integer_type_node, 17); | |
8304 | tree addr_of_x = build1 (ADDR_EXPR, int_star, x); | |
8305 | tree offset_0 = build_int_cst (integer_type_node, 0); | |
8306 | tree star_p = build2 (MEM_REF, integer_type_node, p, offset_0); | |
8307 | ||
8308 | region_model_manager mgr; | |
8309 | region_model model (&mgr); | |
8310 | ||
8311 | /* "x = 17;". */ | |
8312 | model.set_value (x, int_17, NULL); | |
8313 | ||
8314 | /* "p = &x;". */ | |
8315 | model.set_value (p, addr_of_x, NULL); | |
8316 | ||
8317 | const svalue *sval = model.get_rvalue (star_p, NULL); | |
8318 | ASSERT_EQ (sval->maybe_get_constant (), int_17); | |
8319 | } | |
8320 | ||
8321 | /* Test for a POINTER_PLUS_EXPR followed by a MEM_REF. | |
8322 | Analogous to this code: | |
8323 | void test_6 (int a[10]) | |
8324 | { | |
8325 | __analyzer_eval (a[3] == 42); [should be UNKNOWN] | |
8326 | a[3] = 42; | |
8327 | __analyzer_eval (a[3] == 42); [should be TRUE] | |
8328 | } | |
8329 | from data-model-1.c, which looks like this at the gimple level: | |
8330 | # __analyzer_eval (a[3] == 42); [should be UNKNOWN] | |
8331 | int *_1 = a_10(D) + 12; # POINTER_PLUS_EXPR | |
8332 | int _2 = *_1; # MEM_REF | |
8333 | _Bool _3 = _2 == 42; | |
8334 | int _4 = (int) _3; | |
8335 | __analyzer_eval (_4); | |
8336 | ||
8337 | # a[3] = 42; | |
8338 | int *_5 = a_10(D) + 12; # POINTER_PLUS_EXPR | |
8339 | *_5 = 42; # MEM_REF | |
8340 | ||
8341 | # __analyzer_eval (a[3] == 42); [should be TRUE] | |
8342 | int *_6 = a_10(D) + 12; # POINTER_PLUS_EXPR | |
8343 | int _7 = *_6; # MEM_REF | |
8344 | _Bool _8 = _7 == 42; | |
8345 | int _9 = (int) _8; | |
8346 | __analyzer_eval (_9); */ | |
8347 | ||
8348 | static void | |
8349 | test_POINTER_PLUS_EXPR_then_MEM_REF () | |
8350 | { | |
8351 | tree int_star = build_pointer_type (integer_type_node); | |
8352 | tree a = build_global_decl ("a", int_star); | |
8353 | tree offset_12 = build_int_cst (size_type_node, 12); | |
8354 | tree pointer_plus_expr = build2 (POINTER_PLUS_EXPR, int_star, a, offset_12); | |
8355 | tree offset_0 = build_int_cst (integer_type_node, 0); | |
8356 | tree mem_ref = build2 (MEM_REF, integer_type_node, | |
8357 | pointer_plus_expr, offset_0); | |
8358 | region_model_manager mgr; | |
8359 | region_model m (&mgr); | |
8360 | ||
8361 | tree int_42 = build_int_cst (integer_type_node, 42); | |
8362 | m.set_value (mem_ref, int_42, NULL); | |
8363 | ASSERT_EQ (m.get_rvalue (mem_ref, NULL)->maybe_get_constant (), int_42); | |
8364 | } | |
8365 | ||
8366 | /* Verify that malloc works. */ | |
8367 | ||
8368 | static void | |
8369 | test_malloc () | |
8370 | { | |
8371 | tree int_star = build_pointer_type (integer_type_node); | |
8372 | tree p = build_global_decl ("p", int_star); | |
8373 | tree n = build_global_decl ("n", integer_type_node); | |
8374 | tree n_times_4 = build2 (MULT_EXPR, size_type_node, | |
8375 | n, build_int_cst (size_type_node, 4)); | |
8376 | ||
8377 | region_model_manager mgr; | |
8378 | test_region_model_context ctxt; | |
8379 | region_model model (&mgr); | |
8380 | ||
8381 | /* "p = malloc (n * 4);". */ | |
8382 | const svalue *size_sval = model.get_rvalue (n_times_4, &ctxt); | |
ce917b04 DM |
8383 | const region *reg |
8384 | = model.get_or_create_region_for_heap_alloc (size_sval, &ctxt); | |
808f4dfe DM |
8385 | const svalue *ptr = mgr.get_ptr_svalue (int_star, reg); |
8386 | model.set_value (model.get_lvalue (p, &ctxt), ptr, &ctxt); | |
9a2c9579 | 8387 | ASSERT_EQ (model.get_capacity (reg), size_sval); |
808f4dfe DM |
8388 | } |
8389 | ||
8390 | /* Verify that alloca works. */ | |
8391 | ||
8392 | static void | |
8393 | test_alloca () | |
8394 | { | |
8395 | auto_vec <tree> param_types; | |
8396 | tree fndecl = make_fndecl (integer_type_node, | |
8397 | "test_fn", | |
8398 | param_types); | |
8399 | allocate_struct_function (fndecl, true); | |
8400 | ||
8401 | ||
8402 | tree int_star = build_pointer_type (integer_type_node); | |
8403 | tree p = build_global_decl ("p", int_star); | |
8404 | tree n = build_global_decl ("n", integer_type_node); | |
8405 | tree n_times_4 = build2 (MULT_EXPR, size_type_node, | |
8406 | n, build_int_cst (size_type_node, 4)); | |
8407 | ||
8408 | region_model_manager mgr; | |
8409 | test_region_model_context ctxt; | |
8410 | region_model model (&mgr); | |
8411 | ||
8412 | /* Push stack frame. */ | |
8413 | const region *frame_reg | |
8414 | = model.push_frame (DECL_STRUCT_FUNCTION (fndecl), | |
8415 | NULL, &ctxt); | |
8416 | /* "p = alloca (n * 4);". */ | |
8417 | const svalue *size_sval = model.get_rvalue (n_times_4, &ctxt); | |
b9365b93 | 8418 | const region *reg = model.create_region_for_alloca (size_sval, &ctxt); |
808f4dfe DM |
8419 | ASSERT_EQ (reg->get_parent_region (), frame_reg); |
8420 | const svalue *ptr = mgr.get_ptr_svalue (int_star, reg); | |
8421 | model.set_value (model.get_lvalue (p, &ctxt), ptr, &ctxt); | |
9a2c9579 | 8422 | ASSERT_EQ (model.get_capacity (reg), size_sval); |
808f4dfe DM |
8423 | |
8424 | /* Verify that the pointers to the alloca region are replaced by | |
8425 | poisoned values when the frame is popped. */ | |
8426 | model.pop_frame (NULL, NULL, &ctxt); | |
33255ad3 | 8427 | ASSERT_EQ (model.get_rvalue (p, NULL)->get_kind (), SK_POISONED); |
808f4dfe DM |
8428 | } |
8429 | ||
71fc4655 DM |
8430 | /* Verify that svalue::involves_p works. */ |
8431 | ||
8432 | static void | |
8433 | test_involves_p () | |
8434 | { | |
8435 | region_model_manager mgr; | |
8436 | tree int_star = build_pointer_type (integer_type_node); | |
8437 | tree p = build_global_decl ("p", int_star); | |
8438 | tree q = build_global_decl ("q", int_star); | |
8439 | ||
8440 | test_region_model_context ctxt; | |
8441 | region_model model (&mgr); | |
8442 | const svalue *p_init = model.get_rvalue (p, &ctxt); | |
8443 | const svalue *q_init = model.get_rvalue (q, &ctxt); | |
8444 | ||
8445 | ASSERT_TRUE (p_init->involves_p (p_init)); | |
8446 | ASSERT_FALSE (p_init->involves_p (q_init)); | |
8447 | ||
8448 | const region *star_p_reg = mgr.get_symbolic_region (p_init); | |
8449 | const region *star_q_reg = mgr.get_symbolic_region (q_init); | |
8450 | ||
8451 | const svalue *init_star_p = mgr.get_or_create_initial_value (star_p_reg); | |
8452 | const svalue *init_star_q = mgr.get_or_create_initial_value (star_q_reg); | |
8453 | ||
8454 | ASSERT_TRUE (init_star_p->involves_p (p_init)); | |
8455 | ASSERT_FALSE (p_init->involves_p (init_star_p)); | |
8456 | ASSERT_FALSE (init_star_p->involves_p (q_init)); | |
8457 | ASSERT_TRUE (init_star_q->involves_p (q_init)); | |
8458 | ASSERT_FALSE (init_star_q->involves_p (p_init)); | |
8459 | } | |
8460 | ||
757bf1df DM |
8461 | /* Run all of the selftests within this file. */ |
8462 | ||
8463 | void | |
8464 | analyzer_region_model_cc_tests () | |
8465 | { | |
8c08c983 | 8466 | test_tree_cmp_on_constants (); |
757bf1df | 8467 | test_dump (); |
808f4dfe DM |
8468 | test_struct (); |
8469 | test_array_1 (); | |
90f7c300 | 8470 | test_get_representative_tree (); |
757bf1df | 8471 | test_unique_constants (); |
808f4dfe DM |
8472 | test_unique_unknowns (); |
8473 | test_initial_svalue_folding (); | |
8474 | test_unaryop_svalue_folding (); | |
8475 | test_binop_svalue_folding (); | |
8476 | test_sub_svalue_folding (); | |
f09b9955 | 8477 | test_bits_within_svalue_folding (); |
808f4dfe | 8478 | test_descendent_of_p (); |
391512ad | 8479 | test_bit_range_regions (); |
757bf1df | 8480 | test_assignment (); |
a96f1c38 | 8481 | test_compound_assignment (); |
757bf1df DM |
8482 | test_stack_frames (); |
8483 | test_get_representative_path_var (); | |
808f4dfe | 8484 | test_equality_1 (); |
757bf1df DM |
8485 | test_canonicalization_2 (); |
8486 | test_canonicalization_3 (); | |
8c08c983 | 8487 | test_canonicalization_4 (); |
757bf1df DM |
8488 | test_state_merging (); |
8489 | test_constraint_merging (); | |
808f4dfe DM |
8490 | test_widening_constraints (); |
8491 | test_iteration_1 (); | |
6969ac30 | 8492 | test_malloc_constraints (); |
808f4dfe DM |
8493 | test_var (); |
8494 | test_array_2 (); | |
8495 | test_mem_ref (); | |
8496 | test_POINTER_PLUS_EXPR_then_MEM_REF (); | |
8497 | test_malloc (); | |
8498 | test_alloca (); | |
71fc4655 | 8499 | test_involves_p (); |
757bf1df DM |
8500 | } |
8501 | ||
8502 | } // namespace selftest | |
8503 | ||
8504 | #endif /* CHECKING_P */ | |
8505 | ||
75038aa6 DM |
8506 | } // namespace ana |
8507 | ||
757bf1df | 8508 | #endif /* #if ENABLE_ANALYZER */ |