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custom_bitvector_analysis.cpp
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1/*******************************************************************\
2
3Module: Field-insensitive, location-sensitive bitvector analysis
4
5Author: Daniel Kroening, kroening@kroening.com
6
7\*******************************************************************/
8
11
13
14#include <util/expr_util.h>
15#include <util/pointer_expr.h>
16#include <util/simplify_expr.h>
18#include <util/xml_irep.h>
19
21
22#include <iostream>
23
25 const irep_idt &identifier,
26 unsigned bit_nr,
27 modet mode)
28{
29 switch(mode)
30 {
31 case modet::SET_MUST:
32 set_bit(must_bits[identifier], bit_nr);
33 break;
34
36 clear_bit(must_bits[identifier], bit_nr);
37 break;
38
39 case modet::SET_MAY:
40 set_bit(may_bits[identifier], bit_nr);
41 break;
42
44 clear_bit(may_bits[identifier], bit_nr);
45 break;
46 }
47}
48
50 const exprt &lhs,
51 unsigned bit_nr,
52 modet mode)
53{
54 irep_idt id=object2id(lhs);
55 if(!id.empty())
56 set_bit(id, bit_nr, mode);
57}
58
60{
61 if(src.id()==ID_symbol)
62 {
63 return to_symbol_expr(src).get_identifier();
64 }
65 else if(src.id()==ID_dereference)
66 {
67 const exprt &op=to_dereference_expr(src).pointer();
68
69 if(op.id()==ID_address_of)
70 {
71 return object2id(to_address_of_expr(op).object());
72 }
73 else if(op.id()==ID_typecast)
74 {
75 irep_idt op_id=object2id(to_typecast_expr(op).op());
76
77 if(op_id.empty())
78 return irep_idt();
79 else
80 return '*'+id2string(op_id);
81 }
82 else
83 {
84 irep_idt op_id=object2id(op);
85
86 if(op_id.empty())
87 return irep_idt();
88 else
89 return '*'+id2string(op_id);
90 }
91 }
92 else if(src.id()==ID_member)
93 {
94 const auto &m=to_member_expr(src);
95 const exprt &op=m.compound();
96
97 irep_idt op_id=object2id(op);
98
99 if(op_id.empty())
100 return irep_idt();
101 else
102 return id2string(op_id)+'.'+
103 id2string(m.get_component_name());
104 }
105 else if(src.id()==ID_typecast)
106 return object2id(to_typecast_expr(src).op());
107 else
108 return irep_idt();
109}
110
112 const exprt &lhs,
113 const vectorst &vectors)
114{
115 irep_idt id=object2id(lhs);
116 if(!id.empty())
117 assign_lhs(id, vectors);
118}
119
121 const irep_idt &identifier,
122 const vectorst &vectors)
123{
124 // we erase blank ones to avoid noise
125
126 if(vectors.must_bits==0)
127 must_bits.erase(identifier);
128 else
129 must_bits[identifier]=vectors.must_bits;
130
131 if(vectors.may_bits==0)
132 may_bits.erase(identifier);
133 else
134 may_bits[identifier]=vectors.may_bits;
135}
136
139{
140 vectorst vectors;
141
142 bitst::const_iterator may_it=may_bits.find(identifier);
143 if(may_it!=may_bits.end())
144 vectors.may_bits=may_it->second;
145
146 bitst::const_iterator must_it=must_bits.find(identifier);
147 if(must_it!=must_bits.end())
148 vectors.must_bits=must_it->second;
149
150 return vectors;
151}
152
155{
156 if(rhs.id()==ID_symbol ||
157 rhs.id()==ID_dereference)
158 {
159 const irep_idt identifier=object2id(rhs);
160 return get_rhs(identifier);
161 }
162 else if(rhs.id()==ID_typecast)
163 {
164 return get_rhs(to_typecast_expr(rhs).op());
165 }
166 else if(rhs.id()==ID_if)
167 {
168 // need to merge both
169 vectorst v_true=get_rhs(to_if_expr(rhs).true_case());
170 vectorst v_false=get_rhs(to_if_expr(rhs).false_case());
171 return merge(v_true, v_false);
172 }
173
174 return vectorst();
175}
176
178 const exprt &string_expr)
179{
180 if(string_expr.id()==ID_typecast)
181 return get_bit_nr(to_typecast_expr(string_expr).op());
182 else if(string_expr.id()==ID_address_of)
183 return get_bit_nr(to_address_of_expr(string_expr).object());
184 else if(string_expr.id()==ID_index)
185 return get_bit_nr(to_index_expr(string_expr).array());
186 else if(string_expr.id()==ID_string_constant)
187 return bits.number(to_string_constant(string_expr).get_value());
188 else
189 return bits.number("(unknown)");
190}
191
193 const exprt &src,
194 locationt loc)
195{
196 if(src.id()==ID_symbol)
197 {
198 std::set<exprt> result;
199 result.insert(src);
200 return result;
201 }
202 else if(src.id()==ID_dereference)
203 {
204 exprt pointer=to_dereference_expr(src).pointer();
205
206 const std::set<exprt> alias_set =
207 local_may_alias_factory(loc).get(loc, pointer);
208
209 std::set<exprt> result;
210
211 for(const auto &alias : alias_set)
212 if(alias.type().id() == ID_pointer)
213 result.insert(dereference_exprt(alias));
214
215 result.insert(src);
216
217 return result;
218 }
219 else if(src.id()==ID_typecast)
220 {
221 return aliases(to_typecast_expr(src).op(), loc);
222 }
223 else
224 return std::set<exprt>();
225}
226
228 locationt from,
229 const exprt &lhs,
230 const exprt &rhs,
232 const namespacet &ns)
233{
234 if(lhs.type().id() == ID_struct || lhs.type().id() == ID_struct_tag)
235 {
236 const struct_typet &struct_type=
237 to_struct_type(ns.follow(lhs.type()));
238
239 // assign member-by-member
240 for(const auto &c : struct_type.components())
241 {
242 member_exprt lhs_member(lhs, c),
243 rhs_member(rhs, c);
244 assign_struct_rec(from, lhs_member, rhs_member, cba, ns);
245 }
246 }
247 else
248 {
249 // may alias other stuff
250 std::set<exprt> lhs_set=cba.aliases(lhs, from);
251
252 vectorst rhs_vectors=get_rhs(rhs);
253
254 for(const auto &lhs_alias : lhs_set)
255 {
256 assign_lhs(lhs_alias, rhs_vectors);
257 }
258
259 // is it a pointer?
260 if(lhs.type().id()==ID_pointer)
261 {
262 dereference_exprt lhs_deref(lhs);
263 dereference_exprt rhs_deref(rhs);
264 assign_lhs(lhs_deref, get_rhs(rhs_deref));
265 }
266 }
267}
268
270 const irep_idt &function_from,
271 trace_ptrt trace_from,
272 const irep_idt &function_to,
273 trace_ptrt trace_to,
274 ai_baset &ai,
275 const namespacet &ns)
276{
277 locationt from{trace_from->current_location()};
278 locationt to{trace_to->current_location()};
279
280 // upcast of ai
282 static_cast<custom_bitvector_analysist &>(ai);
283
284 const goto_programt::instructiont &instruction=*from;
285
286 switch(instruction.type())
287 {
288 case ASSIGN:
290 from, instruction.assign_lhs(), instruction.assign_rhs(), cba, ns);
291 break;
292
293 case DECL:
294 {
295 const auto &decl_symbol = instruction.decl_symbol();
296 assign_lhs(decl_symbol, vectorst());
297
298 // is it a pointer?
299 if(decl_symbol.type().id() == ID_pointer)
300 assign_lhs(dereference_exprt(decl_symbol), vectorst());
301 }
302 break;
303
304 case DEAD:
305 assign_lhs(instruction.dead_symbol(), vectorst());
306
307 // is it a pointer?
308 if(instruction.dead_symbol().type().id() == ID_pointer)
310 break;
311
312 case FUNCTION_CALL:
313 {
314 const exprt &function = instruction.call_function();
315
316 if(function.id()==ID_symbol)
317 {
318 const irep_idt &identifier=to_symbol_expr(function).get_identifier();
319
320 if(
321 identifier == CPROVER_PREFIX "set_must" ||
322 identifier == CPROVER_PREFIX "clear_must" ||
323 identifier == CPROVER_PREFIX "set_may" ||
324 identifier == CPROVER_PREFIX "clear_may")
325 {
326 if(instruction.call_arguments().size() == 2)
327 {
328 unsigned bit_nr = cba.get_bit_nr(instruction.call_arguments()[1]);
329
330 // initialize to make Visual Studio happy
331 modet mode = modet::SET_MUST;
332
333 if(identifier == CPROVER_PREFIX "set_must")
334 mode=modet::SET_MUST;
335 else if(identifier == CPROVER_PREFIX "clear_must")
337 else if(identifier == CPROVER_PREFIX "set_may")
338 mode=modet::SET_MAY;
339 else if(identifier == CPROVER_PREFIX "clear_may")
340 mode=modet::CLEAR_MAY;
341 else
343
344 exprt lhs = instruction.call_arguments()[0];
345
346 if(lhs.type().id()==ID_pointer)
347 {
348 if(
349 lhs.is_constant() &&
350 is_null_pointer(to_constant_expr(lhs))) // NULL means all
351 {
352 if(mode==modet::CLEAR_MAY)
353 {
354 for(auto &bit : may_bits)
355 clear_bit(bit.second, bit_nr);
356
357 // erase blank ones
359 }
360 else if(mode==modet::CLEAR_MUST)
361 {
362 for(auto &bit : must_bits)
363 clear_bit(bit.second, bit_nr);
364
365 // erase blank ones
367 }
368 }
369 else
370 {
371 dereference_exprt deref(lhs);
372
373 // may alias other stuff
374 std::set<exprt> lhs_set=cba.aliases(deref, from);
375
376 for(const auto &l : lhs_set)
377 {
378 set_bit(l, bit_nr, mode);
379 }
380 }
381 }
382 }
383 }
384 else if(identifier=="memcpy" ||
385 identifier=="memmove")
386 {
387 if(instruction.call_arguments().size() == 3)
388 {
389 // we copy all tracked bits from op1 to op0
390 // we do not consider any bits attached to the size op2
391 dereference_exprt lhs_deref(instruction.call_arguments()[0]);
392 dereference_exprt rhs_deref(instruction.call_arguments()[1]);
393
394 assign_struct_rec(from, lhs_deref, rhs_deref, cba, ns);
395 }
396 }
397 else
398 {
399 // only if there is an actual call, i.e., we have a body
400 if(function_from != function_to)
401 {
402 const code_typet &code_type=
403 to_code_type(ns.lookup(identifier).type);
404
405 code_function_callt::argumentst::const_iterator arg_it =
406 instruction.call_arguments().begin();
407 for(const auto &param : code_type.parameters())
408 {
409 const irep_idt &p_identifier=param.get_identifier();
410 if(p_identifier.empty())
411 continue;
412
413 // there may be a mismatch in the number of arguments
414 if(arg_it == instruction.call_arguments().end())
415 break;
416
417 // assignments arguments -> parameters
418 symbol_exprt p=ns.lookup(p_identifier).symbol_expr();
419 // may alias other stuff
420 std::set<exprt> lhs_set=cba.aliases(p, from);
421
422 vectorst rhs_vectors=get_rhs(*arg_it);
423
424 for(const auto &lhs : lhs_set)
425 {
426 assign_lhs(lhs, rhs_vectors);
427 }
428
429 // is it a pointer?
430 if(p.type().id()==ID_pointer)
431 {
432 dereference_exprt lhs_deref(p);
433 dereference_exprt rhs_deref(*arg_it);
434 assign_lhs(lhs_deref, get_rhs(rhs_deref));
435 }
436
437 ++arg_it;
438 }
439 }
440 }
441 }
442 }
443 break;
444
445 case OTHER:
446 {
447 const auto &code = instruction.get_other();
448 const irep_idt &statement = code.get_statement();
449
450 if(
451 statement == ID_set_may || statement == ID_set_must ||
452 statement == ID_clear_may || statement == ID_clear_must)
453 {
455 code.operands().size() == 2, "set/clear_may/must has two operands");
456
457 unsigned bit_nr = cba.get_bit_nr(code.op1());
458
459 // initialize to make Visual Studio happy
460 modet mode = modet::SET_MUST;
461
462 if(statement == ID_set_must)
463 mode=modet::SET_MUST;
464 else if(statement == ID_clear_must)
466 else if(statement == ID_set_may)
467 mode=modet::SET_MAY;
468 else if(statement == ID_clear_may)
469 mode=modet::CLEAR_MAY;
470 else
472
473 exprt lhs = code.op0();
474
475 if(lhs.type().id()==ID_pointer)
476 {
477 if(
478 lhs.is_constant() &&
479 is_null_pointer(to_constant_expr(lhs))) // NULL means all
480 {
481 if(mode==modet::CLEAR_MAY)
482 {
483 for(bitst::iterator b_it=may_bits.begin();
484 b_it!=may_bits.end();
485 b_it++)
486 clear_bit(b_it->second, bit_nr);
487
488 // erase blank ones
490 }
491 else if(mode==modet::CLEAR_MUST)
492 {
493 for(bitst::iterator b_it=must_bits.begin();
494 b_it!=must_bits.end();
495 b_it++)
496 clear_bit(b_it->second, bit_nr);
497
498 // erase blank ones
500 }
501 }
502 else
503 {
504 dereference_exprt deref(lhs);
505
506 // may alias other stuff
507 std::set<exprt> lhs_set=cba.aliases(deref, from);
508
509 for(const auto &l : lhs_set)
510 {
511 set_bit(l, bit_nr, mode);
512 }
513 }
514 }
515 }
516 }
517 break;
518
519 case GOTO:
520 if(has_get_must_or_may(instruction.condition()))
521 {
522 exprt guard = instruction.condition();
523
524 // Comparing iterators is safe as the target must be within the same list
525 // of instructions because this is a GOTO.
526 if(to!=from->get_target())
528
529 const exprt result2 = simplify_expr(eval(guard, cba), ns);
530
531 if(result2.is_false())
532 make_bottom();
533 }
534 break;
535
536 case CATCH:
537 case THROW:
538 DATA_INVARIANT(false, "Exceptions must be removed before analysis");
539 break;
540 case SET_RETURN_VALUE:
541 DATA_INVARIANT(false, "SET_RETURN_VALUE must be removed before analysis");
542 break;
543 case ATOMIC_BEGIN: // Ignoring is a valid over-approximation
544 case ATOMIC_END: // Ignoring is a valid over-approximation
545 case END_FUNCTION: // No action required
546 case LOCATION: // No action required
547 case START_THREAD: // Require a concurrent analysis at higher level
548 case END_THREAD: // Require a concurrent analysis at higher level
549 case SKIP: // No action required
550 case ASSERT: // No action required
551 case ASSUME: // Ignoring is a valid over-approximation
552 break;
553 case INCOMPLETE_GOTO:
555 DATA_INVARIANT(false, "Only complete instructions can be analyzed");
556 break;
557 }
558}
559
561 std::ostream &out,
562 const ai_baset &ai,
563 const namespacet &) const
564{
565 if(has_values.is_known())
566 {
567 out << has_values.to_string() << '\n';
568 return;
569 }
570
572 static_cast<const custom_bitvector_analysist &>(ai);
573
574 for(const auto &bit : may_bits)
575 {
576 out << bit.first << " MAY:";
577 bit_vectort b=bit.second;
578
579 for(unsigned i=0; b!=0; i++, b>>=1)
580 if(b&1)
581 {
582 INVARIANT(i < cba.bits.size(), "inconsistent bit widths");
583 out << ' '
584 << cba.bits[i];
585 }
586
587 out << '\n';
588 }
589
590 for(const auto &bit : must_bits)
591 {
592 out << bit.first << " MUST:";
593 bit_vectort b=bit.second;
594
595 for(unsigned i=0; b!=0; i++, b>>=1)
596 if(b&1)
597 {
598 INVARIANT(i < cba.bits.size(), "inconsistent bit widths");
599 out << ' '
600 << cba.bits[i];
601 }
602
603 out << '\n';
604 }
605}
606
611{
612 bool changed=has_values.is_false();
614
615 // first do MAY
616 bitst::iterator it=may_bits.begin();
617 for(const auto &bit : b.may_bits)
618 {
619 while(it!=may_bits.end() && it->first<bit.first)
620 ++it;
621 if(it==may_bits.end() || bit.first<it->first)
622 {
623 may_bits.insert(it, bit);
624 changed=true;
625 }
626 else if(it!=may_bits.end())
627 {
628 bit_vectort &a_bits=it->second;
629 bit_vectort old=a_bits;
630 a_bits|=bit.second;
631 if(old!=a_bits)
632 changed=true;
633
634 ++it;
635 }
636 }
637
638 // now do MUST
639 it=must_bits.begin();
640 for(auto &bit : b.must_bits)
641 {
642 while(it!=must_bits.end() && it->first<bit.first)
643 {
644 it=must_bits.erase(it);
645 changed=true;
646 }
647 if(it==must_bits.end() || bit.first<it->first)
648 {
649 must_bits.insert(it, bit);
650 changed=true;
651 }
652 else if(it!=must_bits.end())
653 {
654 bit_vectort &a_bits=it->second;
655 bit_vectort old=a_bits;
656 a_bits&=bit.second;
657 if(old!=a_bits)
658 changed=true;
659
660 ++it;
661 }
662 }
663
664 // erase blank ones
667
668 return changed;
669}
670
673{
674 for(bitst::iterator a_it=bits.begin();
675 a_it!=bits.end();
676 ) // no a_it++
677 {
678 if(a_it->second==0)
679 a_it=bits.erase(a_it);
680 else
681 a_it++;
682 }
683}
684
686{
687 if(src.id() == ID_get_must || src.id() == ID_get_may)
688 return true;
689
690 for(const auto &op : src.operands())
691 {
692 if(has_get_must_or_may(op))
693 return true;
694 }
695
696 return false;
697}
698
700 const exprt &src,
701 custom_bitvector_analysist &custom_bitvector_analysis) const
702{
703 if(src.id() == ID_get_must || src.id() == ID_get_may)
704 {
705 if(src.operands().size()==2)
706 {
707 unsigned bit_nr =
708 custom_bitvector_analysis.get_bit_nr(to_binary_expr(src).op1());
709
710 exprt pointer = to_binary_expr(src).op0();
711
712 if(pointer.type().id()!=ID_pointer)
713 return src;
714
715 if(
716 pointer.is_constant() &&
717 is_null_pointer(to_constant_expr(pointer))) // NULL means all
718 {
719 if(src.id() == ID_get_may)
720 {
721 for(const auto &bit : may_bits)
722 if(get_bit(bit.second, bit_nr))
723 return true_exprt();
724
725 return false_exprt();
726 }
727 else if(src.id() == ID_get_must)
728 {
729 return false_exprt();
730 }
731 else
732 return src;
733 }
734 else
735 {
737 get_rhs(dereference_exprt(pointer));
738
739 bool value=false;
740
741 if(src.id() == ID_get_must)
742 value=get_bit(v.must_bits, bit_nr);
743 else if(src.id() == ID_get_may)
744 value=get_bit(v.may_bits, bit_nr);
745
746 if(value)
747 return true_exprt();
748 else
749 return false_exprt();
750 }
751 }
752 else
753 return src;
754 }
755 else
756 {
757 exprt tmp=src;
758 Forall_operands(it, tmp)
759 *it=eval(*it, custom_bitvector_analysis);
760
761 return tmp;
762 }
763}
764
768
770 const goto_modelt &goto_model,
771 bool use_xml,
772 std::ostream &out)
773{
774 unsigned pass=0, fail=0, unknown=0;
775
776 for(const auto &gf_entry : goto_model.goto_functions.function_map)
777 {
778 if(!gf_entry.second.body.has_assertion())
779 continue;
780
781 // TODO this is a hard-coded hack
782 if(gf_entry.first == "__actual_thread_spawn")
783 continue;
784
785 if(!use_xml)
786 out << "******** Function " << gf_entry.first << '\n';
787
788 forall_goto_program_instructions(i_it, gf_entry.second.body)
789 {
790 exprt result;
791 irep_idt description;
792
793 if(i_it->is_assert())
794 {
796 {
797 continue;
798 }
799
800 if(operator[](i_it).has_values.is_false())
801 continue;
802
803 exprt tmp = eval(i_it->condition(), i_it);
804 const namespacet ns(goto_model.symbol_table);
805 result = simplify_expr(std::move(tmp), ns);
806
807 description = i_it->source_location().get_comment();
808 }
809 else
810 continue;
811
812 if(use_xml)
813 {
814 out << "<result status=\"";
815 if(result.is_true())
816 out << "SUCCESS";
817 else if(result.is_false())
818 out << "FAILURE";
819 else
820 out << "UNKNOWN";
821 out << "\">\n";
822 out << xml(i_it->source_location());
823 out << "<description>"
824 << description
825 << "</description>\n";
826 out << "</result>\n\n";
827 }
828 else
829 {
830 out << i_it->source_location();
831 if(!description.empty())
832 out << ", " << description;
833 out << ": ";
834 const namespacet ns(goto_model.symbol_table);
835 out << from_expr(ns, gf_entry.first, result);
836 out << '\n';
837 }
838
839 if(result.is_true())
840 pass++;
841 else if(result.is_false())
842 fail++;
843 else
844 unknown++;
845 }
846
847 if(!use_xml)
848 out << '\n';
849 }
850
851 if(!use_xml)
852 out << "SUMMARY: " << pass << " pass, " << fail << " fail, "
853 << unknown << " unknown\n";
854}
static exprt guard(const exprt::operandst &guards, exprt cond)
This is the basic interface of the abstract interpreter with default implementations of the core func...
Definition ai.h:118
goto_programt::const_targett locationt
Definition ai.h:125
ai_history_baset::trace_ptrt trace_ptrt
Definition ai_domain.h:74
goto_programt::const_targett locationt
Definition ai_domain.h:73
exprt & op0()
Definition expr.h:125
Base type of functions.
Definition std_types.h:539
const parameterst & parameters() const
Definition std_types.h:655
std::set< exprt > aliases(const exprt &, locationt loc)
local_may_alias_factoryt local_may_alias_factory
exprt eval(const exprt &src, locationt loc)
void check(const goto_modelt &, bool xml, std::ostream &)
void set_bit(const exprt &, unsigned bit_nr, modet)
bool merge(const custom_bitvector_domaint &b, trace_ptrt from, trace_ptrt to)
std::map< irep_idt, bit_vectort > bitst
static irep_idt object2id(const exprt &)
void assign_struct_rec(locationt from, const exprt &lhs, const exprt &rhs, custom_bitvector_analysist &, const namespacet &)
static bool has_get_must_or_may(const exprt &)
vectorst get_rhs(const exprt &) const
static void clear_bit(bit_vectort &dest, unsigned bit_nr)
void transform(const irep_idt &function_from, trace_ptrt trace_from, const irep_idt &function_to, trace_ptrt trace_to, ai_baset &ai, const namespacet &ns) final override
how function calls are treated: a) there is an edge from each call site to the function head b) there...
void output(std::ostream &out, const ai_baset &ai, const namespacet &ns) const final override
void assign_lhs(const exprt &, const vectorst &)
void erase_blank_vectors(bitst &)
erase blank bitvectors
static bool get_bit(const bit_vectort src, unsigned bit_nr)
void make_bottom() final override
no states
exprt eval(const exprt &src, custom_bitvector_analysist &) const
Operator to dereference a pointer.
dstringt has one field, an unsigned integer no which is an index into a static table of strings.
Definition dstring.h:39
bool empty() const
Definition dstring.h:90
Base class for all expressions.
Definition expr.h:56
bool is_true() const
Return whether the expression is a constant representing true.
Definition expr.cpp:27
bool is_false() const
Return whether the expression is a constant representing false.
Definition expr.cpp:34
exprt & op0()
Definition expr.h:125
bool is_constant() const
Return whether the expression is a constant.
Definition expr.h:204
typet & type()
Return the type of the expression.
Definition expr.h:84
operandst & operands()
Definition expr.h:94
The Boolean constant false.
Definition std_expr.h:3017
A collection of goto functions.
function_mapt function_map
symbol_tablet symbol_table
Symbol table.
Definition goto_model.h:31
goto_functionst goto_functions
GOTO functions.
Definition goto_model.h:34
This class represents an instruction in the GOTO intermediate representation.
const symbol_exprt & dead_symbol() const
Get the symbol for DEAD.
const goto_instruction_codet & get_other() const
Get the statement for OTHER.
const symbol_exprt & decl_symbol() const
Get the declared symbol for DECL.
const exprt::operandst & call_arguments() const
Get the arguments of a FUNCTION_CALL.
const exprt & assign_lhs() const
Get the lhs of the assignment for ASSIGN.
const exprt & assign_rhs() const
Get the rhs of the assignment for ASSIGN.
const exprt & call_function() const
Get the function that is called for FUNCTION_CALL.
const exprt & condition() const
Get the condition of gotos, assume, assert.
goto_program_instruction_typet type() const
What kind of instruction?
const irep_idt & id() const
Definition irep.h:396
std::set< exprt > get(const goto_programt::const_targett t, const exprt &src) const
Extract member of struct or union.
Definition std_expr.h:2794
const typet & follow(const typet &) const
Resolve type symbol to the type it points to.
Definition namespace.cpp:49
A namespacet is essentially one or two symbol tables bound together, to allow for symbol lookups in t...
Definition namespace.h:91
bool lookup(const irep_idt &name, const symbolt *&symbol) const override
See documentation for namespace_baset::lookup().
number_type number(const key_type &a)
Definition numbering.h:37
Structure type, corresponds to C style structs.
Definition std_types.h:231
const componentst & components() const
Definition std_types.h:147
Expression to hold a symbol (variable)
Definition std_expr.h:113
const irep_idt & get_identifier() const
Definition std_expr.h:142
The Boolean constant true.
Definition std_expr.h:3008
bool is_known() const
Definition threeval.h:28
const char * to_string() const
Definition threeval.cpp:13
bool is_false() const
Definition threeval.h:26
static tvt unknown()
Definition threeval.h:33
#define CPROVER_PREFIX
Field-insensitive, location-sensitive bitvector analysis.
#define Forall_operands(it, expr)
Definition expr.h:27
exprt boolean_negate(const exprt &src)
negate a Boolean expression, possibly removing a not_exprt, and swapping false and true
bool is_null_pointer(const constant_exprt &expr)
Returns true if expr has a pointer type and a value NULL; it also returns true when expr has value ze...
Deprecated expression utility functions.
#define forall_goto_program_instructions(it, program)
@ FUNCTION_CALL
@ ATOMIC_END
@ DEAD
@ LOCATION
@ END_FUNCTION
@ ASSIGN
@ ASSERT
@ SET_RETURN_VALUE
@ ATOMIC_BEGIN
@ CATCH
@ END_THREAD
@ SKIP
@ NO_INSTRUCTION_TYPE
@ START_THREAD
@ THROW
@ DECL
@ OTHER
@ GOTO
@ INCOMPLETE_GOTO
@ ASSUME
const std::string & id2string(const irep_idt &d)
Definition irep.h:47
std::string from_expr(const namespacet &ns, const irep_idt &identifier, const exprt &expr)
API to expression classes for Pointers.
const address_of_exprt & to_address_of_expr(const exprt &expr)
Cast an exprt to an address_of_exprt.
const dereference_exprt & to_dereference_expr(const exprt &expr)
Cast an exprt to a dereference_exprt.
xmlt xml(const irep_idt &property_id, const property_infot &property_info)
exprt simplify_expr(exprt src, const namespacet &ns)
#define UNREACHABLE
This should be used to mark dead code.
Definition invariant.h:525
#define DATA_INVARIANT(CONDITION, REASON)
This condition should be used to document that assumptions that are made on goto_functions,...
Definition invariant.h:534
#define INVARIANT(CONDITION, REASON)
This macro uses the wrapper function 'invariant_violated_string'.
Definition invariant.h:423
const index_exprt & to_index_expr(const exprt &expr)
Cast an exprt to an index_exprt.
Definition std_expr.h:1478
const typecast_exprt & to_typecast_expr(const exprt &expr)
Cast an exprt to a typecast_exprt.
Definition std_expr.h:2051
const binary_exprt & to_binary_expr(const exprt &expr)
Cast an exprt to a binary_exprt.
Definition std_expr.h:660
const if_exprt & to_if_expr(const exprt &expr)
Cast an exprt to an if_exprt.
Definition std_expr.h:2403
const member_exprt & to_member_expr(const exprt &expr)
Cast an exprt to a member_exprt.
Definition std_expr.h:2886
const constant_exprt & to_constant_expr(const exprt &expr)
Cast an exprt to a constant_exprt.
Definition std_expr.h:2992
const symbol_exprt & to_symbol_expr(const exprt &expr)
Cast an exprt to a symbol_exprt.
Definition std_expr.h:222
const code_typet & to_code_type(const typet &type)
Cast a typet to a code_typet.
Definition std_types.h:744
const struct_typet & to_struct_type(const typet &type)
Cast a typet to a struct_typet.
Definition std_types.h:308
const string_constantt & to_string_constant(const exprt &expr)
dstringt irep_idt