cprover
satcheck_cadical.cpp
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1 /*******************************************************************\
2 
3 Module:
4 
5 Author: Michael Tautschnig
6 
7 \*******************************************************************/
8 
9 #include "satcheck_cadical.h"
10 
11 #include <util/exception_utils.h>
12 #include <util/invariant.h>
13 #include <util/threeval.h>
14 
15 #ifdef HAVE_CADICAL
16 
17 #include <cadical.hpp>
18 
20 {
21  if(a.is_constant())
22  return tvt(a.sign());
23 
24  tvt result;
25 
26  if(a.var_no() > static_cast<unsigned>(solver->max()))
28 
29  const int val = solver->val(a.dimacs());
30  if(val>0)
31  result = tvt(true);
32  else if(val<0)
33  result = tvt(false);
34  else
36 
37  return result;
38 }
39 
40 const std::string satcheck_cadicalt::solver_text()
41 {
42  return std::string("CaDiCaL ") + solver->version();
43 }
44 
45 void satcheck_cadicalt::lcnf(const bvt &bv)
46 {
47  for(const auto &lit : bv)
48  {
49  if(lit.is_true())
50  return;
51  else if(!lit.is_false())
52  INVARIANT(lit.var_no() < no_variables(), "reject out of bound variables");
53  }
54 
55  for(const auto &lit : bv)
56  {
57  if(!lit.is_false())
58  {
59  // add literal with correct sign
60  solver->add(lit.dimacs());
61  }
62  }
63  solver->add(0); // terminate clause
64 
66 }
67 
69 {
70  INVARIANT(status != statust::ERROR, "there cannot be an error");
71 
72  messaget::status() << (no_variables() - 1) << " variables, " << clause_counter
73  << " clauses" << eom;
74 
75  if(status == statust::UNSAT)
76  {
77  messaget::status() << "SAT checker inconsistent: instance is UNSATISFIABLE"
78  << eom;
79  }
80  else
81  {
82  switch(solver->solve())
83  {
84  case 10:
85  messaget::status() << "SAT checker: instance is SATISFIABLE" << eom;
88  case 20:
89  messaget::status() << "SAT checker: instance is UNSATISFIABLE" << eom;
90  break;
91  default:
92  messaget::status() << "SAT checker: solving returned without solution"
93  << eom;
94  throw analysis_exceptiont(
95  "solving inside CaDiCaL SAT solver has been interrupted");
96  }
97  }
98 
101 }
102 
104 {
105  INVARIANT(!a.is_constant(), "cannot set an assignment for a constant");
106  INVARIANT(false, "method not supported");
107 }
108 
110  solver(new CaDiCaL::Solver())
111 {
112  solver->set("quiet", 1);
113 }
114 
116 {
117  delete solver;
118 }
119 
121 {
122  INVARIANT(false, "method not supported");
123 }
124 
126 {
127  INVARIANT(false, "method not supported");
128  return false;
129 }
130 
131 #endif
virtual void set_assumptions(const bvt &_assumptions) override
size_t clause_counter
Definition: cnf.h:81
int dimacs() const
Definition: literal.h:116
virtual ~satcheck_cadicalt()
virtual const std::string solver_text() override
virtual resultt prop_solve() override
CaDiCaL::Solver * solver
virtual void lcnf(const bvt &bv) override
int solver(std::istream &in)
virtual tvt l_get(literalt a) const override
Definition: threeval.h:19
var_not var_no() const
Definition: literal.h:82
Thrown when an unexpected error occurs during the analysis (e.g., when the SAT solver returns an erro...
resultt
Definition: prop.h:96
static eomt eom
Definition: message.h:284
mstreamt & result() const
Definition: message.h:396
mstreamt & status() const
Definition: message.h:401
bool is_constant() const
Definition: literal.h:165
virtual void set_assignment(literalt a, bool value) override
bool sign() const
Definition: literal.h:87
virtual bool is_in_conflict(literalt a) const override
Returns true if an assumption is in the final conflict.
virtual size_t no_variables() const override
Definition: cnf.h:38
std::vector< literalt > bvt
Definition: literal.h:200