cprover
custom_bitvector_analysis.cpp
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1 /*******************************************************************\
2 
3 Module: Field-insensitive, location-sensitive bitvector analysis
4 
5 Author: 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>
17 #include <util/string_constant.h>
18 #include <util/xml_irep.h>
19 
20 #include <langapi/language_util.h>
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 
35  case modet::CLEAR_MUST:
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 
43  case modet::CLEAR_MAY:
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:
289  {
290  const code_assignt &code_assign = instruction.get_assign();
291  assign_struct_rec(from, code_assign.lhs(), code_assign.rhs(), cba, ns);
292  }
293  break;
294 
295  case DECL:
296  {
297  const auto &decl_symbol = instruction.decl_symbol();
298  assign_lhs(decl_symbol, vectorst());
299 
300  // is it a pointer?
301  if(decl_symbol.type().id() == ID_pointer)
302  assign_lhs(dereference_exprt(decl_symbol), vectorst());
303  }
304  break;
305 
306  case DEAD:
307  assign_lhs(instruction.dead_symbol(), vectorst());
308 
309  // is it a pointer?
310  if(instruction.dead_symbol().type().id() == ID_pointer)
312  break;
313 
314  case FUNCTION_CALL:
315  {
316  const exprt &function = instruction.call_function();
317 
318  if(function.id()==ID_symbol)
319  {
320  const irep_idt &identifier=to_symbol_expr(function).get_identifier();
321 
322  if(
323  identifier == CPROVER_PREFIX "set_must" ||
324  identifier == CPROVER_PREFIX "clear_must" ||
325  identifier == CPROVER_PREFIX "set_may" ||
326  identifier == CPROVER_PREFIX "clear_may")
327  {
328  if(instruction.call_arguments().size() == 2)
329  {
330  unsigned bit_nr = cba.get_bit_nr(instruction.call_arguments()[1]);
331 
332  // initialize to make Visual Studio happy
333  modet mode = modet::SET_MUST;
334 
335  if(identifier == CPROVER_PREFIX "set_must")
336  mode=modet::SET_MUST;
337  else if(identifier == CPROVER_PREFIX "clear_must")
338  mode=modet::CLEAR_MUST;
339  else if(identifier == CPROVER_PREFIX "set_may")
340  mode=modet::SET_MAY;
341  else if(identifier == CPROVER_PREFIX "clear_may")
342  mode=modet::CLEAR_MAY;
343  else
344  UNREACHABLE;
345 
346  exprt lhs = instruction.call_arguments()[0];
347 
348  if(lhs.type().id()==ID_pointer)
349  {
350  if(lhs.is_constant() &&
351  to_constant_expr(lhs).get_value()==ID_NULL) // NULL means all
352  {
353  if(mode==modet::CLEAR_MAY)
354  {
355  for(auto &bit : may_bits)
356  clear_bit(bit.second, bit_nr);
357 
358  // erase blank ones
360  }
361  else if(mode==modet::CLEAR_MUST)
362  {
363  for(auto &bit : must_bits)
364  clear_bit(bit.second, bit_nr);
365 
366  // erase blank ones
368  }
369  }
370  else
371  {
372  dereference_exprt deref(lhs);
373 
374  // may alias other stuff
375  std::set<exprt> lhs_set=cba.aliases(deref, from);
376 
377  for(const auto &l : lhs_set)
378  {
379  set_bit(l, bit_nr, mode);
380  }
381  }
382  }
383  }
384  }
385  else if(identifier=="memcpy" ||
386  identifier=="memmove")
387  {
388  if(instruction.call_arguments().size() == 3)
389  {
390  // we copy all tracked bits from op1 to op0
391  // we do not consider any bits attached to the size op2
392  dereference_exprt lhs_deref(instruction.call_arguments()[0]);
393  dereference_exprt rhs_deref(instruction.call_arguments()[1]);
394 
395  assign_struct_rec(from, lhs_deref, rhs_deref, cba, ns);
396  }
397  }
398  else
399  {
400  // only if there is an actual call, i.e., we have a body
401  if(function_from != function_to)
402  {
403  const code_typet &code_type=
404  to_code_type(ns.lookup(identifier).type);
405 
406  code_function_callt::argumentst::const_iterator arg_it =
407  instruction.call_arguments().begin();
408  for(const auto &param : code_type.parameters())
409  {
410  const irep_idt &p_identifier=param.get_identifier();
411  if(p_identifier.empty())
412  continue;
413 
414  // there may be a mismatch in the number of arguments
415  if(arg_it == instruction.call_arguments().end())
416  break;
417 
418  // assignments arguments -> parameters
419  symbol_exprt p=ns.lookup(p_identifier).symbol_expr();
420  // may alias other stuff
421  std::set<exprt> lhs_set=cba.aliases(p, from);
422 
423  vectorst rhs_vectors=get_rhs(*arg_it);
424 
425  for(const auto &lhs : lhs_set)
426  {
427  assign_lhs(lhs, rhs_vectors);
428  }
429 
430  // is it a pointer?
431  if(p.type().id()==ID_pointer)
432  {
433  dereference_exprt lhs_deref(p);
434  dereference_exprt rhs_deref(*arg_it);
435  assign_lhs(lhs_deref, get_rhs(rhs_deref));
436  }
437 
438  ++arg_it;
439  }
440  }
441  }
442  }
443  }
444  break;
445 
446  case OTHER:
447  {
448  const auto &code = instruction.get_other();
449  const irep_idt &statement = code.get_statement();
450 
451  if(
452  statement == ID_set_may || statement == ID_set_must ||
453  statement == ID_clear_may || statement == ID_clear_must)
454  {
456  code.operands().size() == 2, "set/clear_may/must has two operands");
457 
458  unsigned bit_nr = cba.get_bit_nr(code.op1());
459 
460  // initialize to make Visual Studio happy
461  modet mode = modet::SET_MUST;
462 
463  if(statement == ID_set_must)
464  mode=modet::SET_MUST;
465  else if(statement == ID_clear_must)
466  mode=modet::CLEAR_MUST;
467  else if(statement == ID_set_may)
468  mode=modet::SET_MAY;
469  else if(statement == ID_clear_may)
470  mode=modet::CLEAR_MAY;
471  else
472  UNREACHABLE;
473 
474  exprt lhs = code.op0();
475 
476  if(lhs.type().id()==ID_pointer)
477  {
478  if(lhs.is_constant() &&
479  to_constant_expr(lhs).get_value()==ID_NULL) // 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.get_condition()))
521  {
522  exprt guard = instruction.get_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())
527  guard = boolean_negate(guard);
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:
554  case NO_INSTRUCTION_TYPE:
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 
571  const custom_bitvector_analysist &cba=
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  assert(i<cba.bits.size());
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  assert(i<cba.bits.size());
599  out << ' '
600  << cba.bits[i];
601  }
602 
603  out << '\n';
604  }
605 }
606 
608  const custom_bitvector_domaint &b,
609  trace_ptrt,
610  trace_ptrt)
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  forall_operands(it, src)
691  if(has_get_must_or_may(*it))
692  return true;
693 
694  return false;
695 }
696 
698  const exprt &src,
699  custom_bitvector_analysist &custom_bitvector_analysis) const
700 {
701  if(src.id() == ID_get_must || src.id() == ID_get_may)
702  {
703  if(src.operands().size()==2)
704  {
705  unsigned bit_nr =
706  custom_bitvector_analysis.get_bit_nr(to_binary_expr(src).op1());
707 
708  exprt pointer = to_binary_expr(src).op0();
709 
710  if(pointer.type().id()!=ID_pointer)
711  return src;
712 
713  if(pointer.is_constant() &&
714  to_constant_expr(pointer).get_value()==ID_NULL) // NULL means all
715  {
716  if(src.id() == ID_get_may)
717  {
718  for(const auto &bit : may_bits)
719  if(get_bit(bit.second, bit_nr))
720  return true_exprt();
721 
722  return false_exprt();
723  }
724  else if(src.id() == ID_get_must)
725  {
726  return false_exprt();
727  }
728  else
729  return src;
730  }
731  else
732  {
734  get_rhs(dereference_exprt(pointer));
735 
736  bool value=false;
737 
738  if(src.id() == ID_get_must)
739  value=get_bit(v.must_bits, bit_nr);
740  else if(src.id() == ID_get_may)
741  value=get_bit(v.may_bits, bit_nr);
742 
743  if(value)
744  return true_exprt();
745  else
746  return false_exprt();
747  }
748  }
749  else
750  return src;
751  }
752  else
753  {
754  exprt tmp=src;
755  Forall_operands(it, tmp)
756  *it=eval(*it, custom_bitvector_analysis);
757 
758  return tmp;
759  }
760 }
761 
763 {
764 }
765 
767  const goto_modelt &goto_model,
768  bool use_xml,
769  std::ostream &out)
770 {
771  unsigned pass=0, fail=0, unknown=0;
772 
773  for(const auto &gf_entry : goto_model.goto_functions.function_map)
774  {
775  if(!gf_entry.second.body.has_assertion())
776  continue;
777 
778  // TODO this is a hard-coded hack
779  if(gf_entry.first == "__actual_thread_spawn")
780  continue;
781 
782  if(!use_xml)
783  out << "******** Function " << gf_entry.first << '\n';
784 
785  forall_goto_program_instructions(i_it, gf_entry.second.body)
786  {
787  exprt result;
788  irep_idt description;
789 
790  if(i_it->is_assert())
791  {
793  i_it->get_condition()))
794  {
795  continue;
796  }
797 
798  if(operator[](i_it).has_values.is_false())
799  continue;
800 
801  exprt tmp = eval(i_it->get_condition(), i_it);
802  const namespacet ns(goto_model.symbol_table);
803  result = simplify_expr(std::move(tmp), ns);
804 
805  description=i_it->source_location.get_comment();
806  }
807  else
808  continue;
809 
810  if(use_xml)
811  {
812  out << "<result status=\"";
813  if(result.is_true())
814  out << "SUCCESS";
815  else if(result.is_false())
816  out << "FAILURE";
817  else
818  out << "UNKNOWN";
819  out << "\">\n";
820  out << xml(i_it->source_location);
821  out << "<description>"
822  << description
823  << "</description>\n";
824  out << "</result>\n\n";
825  }
826  else
827  {
828  out << i_it->source_location;
829  if(!description.empty())
830  out << ", " << description;
831  out << ": ";
832  const namespacet ns(goto_model.symbol_table);
833  out << from_expr(ns, gf_entry.first, result);
834  out << '\n';
835  }
836 
837  if(result.is_true())
838  pass++;
839  else if(result.is_false())
840  fail++;
841  else
842  unknown++;
843  }
844 
845  if(!use_xml)
846  out << '\n';
847  }
848 
849  if(!use_xml)
850  out << "SUMMARY: " << pass << " pass, " << fail << " fail, "
851  << unknown << " unknown\n";
852 }
This is the basic interface of the abstract interpreter with default implementations of the core func...
Definition: ai.h:119
goto_programt::const_targett locationt
Definition: ai.h:126
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:99
A codet representing an assignment in the program.
Definition: std_code.h:293
exprt & rhs()
Definition: std_code.h:315
exprt & lhs()
Definition: std_code.h:310
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.
Definition: pointer_expr.h:628
dstringt has one field, an unsigned integer no which is an index into a static table of strings.
Definition: dstring.h:37
bool empty() const
Definition: dstring.h:88
Base class for all expressions.
Definition: expr.h:54
bool is_true() const
Return whether the expression is a constant representing true.
Definition: expr.cpp:33
bool is_false() const
Return whether the expression is a constant representing false.
Definition: expr.cpp:42
typet & type()
Return the type of the expression.
Definition: expr.h:82
bool is_constant() const
Return whether the expression is a constant.
Definition: expr.cpp:26
exprt & op0()
Definition: expr.h:99
operandst & operands()
Definition: expr.h:92
The Boolean constant false.
Definition: std_expr.h:2811
A collection of goto functions.
function_mapt function_map
symbol_tablet symbol_table
Symbol table.
Definition: goto_model.h:30
goto_functionst goto_functions
GOTO functions.
Definition: goto_model.h:33
This class represents an instruction in the GOTO intermediate representation.
Definition: goto_program.h:178
const codet & get_other() const
Get the statement for OTHER.
Definition: goto_program.h:417
const exprt & call_function() const
Get the function that is called for FUNCTION_CALL.
Definition: goto_program.h:361
goto_program_instruction_typet type
What kind of instruction?
Definition: goto_program.h:434
const exprt & get_condition() const
Get the condition of gotos, assume, assert.
Definition: goto_program.h:447
const symbol_exprt & dead_symbol() const
Get the symbol for DEAD.
Definition: goto_program.h:295
const code_assignt & get_assign() const
Get the assignment for ASSIGN.
Definition: goto_program.h:198
const symbol_exprt & decl_symbol() const
Get the declared symbol for DECL.
Definition: goto_program.h:253
const exprt::operandst & call_arguments() const
Get the arguments of a FUNCTION_CALL.
Definition: goto_program.h:389
const irep_idt & id() const
Definition: irep.h:407
std::set< exprt > get(const goto_programt::const_targett t, const exprt &src) const
Extract member of struct or union.
Definition: std_expr.h:2613
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().
Definition: namespace.cpp:138
number_type number(const key_type &a)
Definition: numbering.h:37
size_type size() const
Definition: numbering.h:66
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:80
const irep_idt & get_identifier() const
Definition: std_expr.h:109
The Boolean constant true.
Definition: std_expr.h:2802
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:18
#define Forall_operands(it, expr)
Definition: expr.h:25
exprt boolean_negate(const exprt &src)
negate a Boolean expression, possibly removing a not_exprt, and swapping false and true
Definition: expr_util.cpp:125
Deprecated expression utility functions.
#define forall_goto_program_instructions(it, program)
@ FUNCTION_CALL
Definition: goto_program.h:47
@ ATOMIC_END
Definition: goto_program.h:42
@ DEAD
Definition: goto_program.h:46
@ END_FUNCTION
Definition: goto_program.h:40
@ ASSIGN
Definition: goto_program.h:44
@ ASSERT
Definition: goto_program.h:34
@ SET_RETURN_VALUE
Definition: goto_program.h:43
@ ATOMIC_BEGIN
Definition: goto_program.h:41
@ CATCH
Definition: goto_program.h:49
@ END_THREAD
Definition: goto_program.h:38
@ SKIP
Definition: goto_program.h:36
@ NO_INSTRUCTION_TYPE
Definition: goto_program.h:31
@ START_THREAD
Definition: goto_program.h:37
@ THROW
Definition: goto_program.h:48
@ DECL
Definition: goto_program.h:45
@ OTHER
Definition: goto_program.h:35
@ GOTO
Definition: goto_program.h:32
@ INCOMPLETE_GOTO
Definition: goto_program.h:50
@ ASSUME
Definition: goto_program.h:33
dstringt irep_idt
Definition: irep.h:37
const std::string & id2string(const irep_idt &d)
Definition: irep.h:49
std::string from_expr(const namespacet &ns, const irep_idt &identifier, const exprt &expr)
API to expression classes for Pointers.
const dereference_exprt & to_dereference_expr(const exprt &expr)
Cast an exprt to a dereference_exprt.
Definition: pointer_expr.h:684
const address_of_exprt & to_address_of_expr(const exprt &expr)
Cast an exprt to an address_of_exprt.
Definition: pointer_expr.h:378
xmlt xml(const irep_idt &property_id, const property_infot &property_info)
Definition: properties.cpp:107
exprt simplify_expr(exprt src, const namespacet &ns)
#define UNREACHABLE
This should be used to mark dead code.
Definition: invariant.h:503
#define DATA_INVARIANT(CONDITION, REASON)
This condition should be used to document that assumptions that are made on goto_functions,...
Definition: invariant.h:510
const if_exprt & to_if_expr(const exprt &expr)
Cast an exprt to an if_exprt.
Definition: std_expr.h:2237
const constant_exprt & to_constant_expr(const exprt &expr)
Cast an exprt to a constant_exprt.
Definition: std_expr.h:2786
const symbol_exprt & to_symbol_expr(const exprt &expr)
Cast an exprt to a symbol_exprt.
Definition: std_expr.h:189
const typecast_exprt & to_typecast_expr(const exprt &expr)
Cast an exprt to a typecast_exprt.
Definition: std_expr.h:1900
const binary_exprt & to_binary_expr(const exprt &expr)
Cast an exprt to a binary_exprt.
Definition: std_expr.h:627
const member_exprt & to_member_expr(const exprt &expr)
Cast an exprt to a member_exprt.
Definition: std_expr.h:2697
const index_exprt & to_index_expr(const exprt &expr)
Cast an exprt to an index_exprt.
Definition: std_expr.h:1382
const struct_typet & to_struct_type(const typet &type)
Cast a typet to a struct_typet.
Definition: std_types.h:308
const code_typet & to_code_type(const typet &type)
Cast a typet to a code_typet.
Definition: std_types.h:744
const string_constantt & to_string_constant(const exprt &expr)