1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
/********************* */
/*! \file minisat.cpp
** \verbatim
** Original author: dejan
** Major contributors:
** Minor contributors (to current version):
** This file is part of the CVC4 prototype.
** Copyright (c) 2009, 2010, 2011 The Analysis of Computer Systems Group (ACSys)
** Courant Institute of Mathematical Sciences
** New York University
** See the file COPYING in the top-level source directory for licensing
** information.\endverbatim
**
** \brief SAT Solver.
**
** Implementation of the minisat for cvc4.
**/
#include "prop/minisat/minisat.h"
#include "prop/minisat/simp/SimpSolver.h"
using namespace CVC4;
using namespace CVC4::prop;
//// DPllMinisatSatSolver
MinisatSatSolver::MinisatSatSolver() :
d_minisat(NULL),
d_theoryProxy(NULL),
d_context(NULL)
{}
MinisatSatSolver::~MinisatSatSolver() {
delete d_minisat;
}
SatVariable MinisatSatSolver::toSatVariable(Minisat::Var var) {
if (var == var_Undef) {
return undefSatVariable;
}
return SatVariable(var);
}
Minisat::Lit MinisatSatSolver::toMinisatLit(SatLiteral lit) {
if (lit == undefSatLiteral) {
return Minisat::lit_Undef;
}
return Minisat::mkLit(lit.getSatVariable(), lit.isNegated());
}
SatLiteral MinisatSatSolver::toSatLiteral(Minisat::Lit lit) {
if (lit == Minisat::lit_Undef) {
return undefSatLiteral;
}
return SatLiteral(SatVariable(Minisat::var(lit)),
Minisat::sign(lit));
}
SatValue MinisatSatSolver::toSatLiteralValue(bool res) {
if(res) return SAT_VALUE_TRUE;
else return SAT_VALUE_FALSE;
}
SatValue MinisatSatSolver::toSatLiteralValue(Minisat::lbool res) {
if(res == (Minisat::lbool((uint8_t)0))) return SAT_VALUE_TRUE;
if(res == (Minisat::lbool((uint8_t)2))) return SAT_VALUE_UNKNOWN;
Assert(res == (Minisat::lbool((uint8_t)1)));
return SAT_VALUE_FALSE;
}
void MinisatSatSolver::toMinisatClause(SatClause& clause,
Minisat::vec<Minisat::Lit>& minisat_clause) {
for (unsigned i = 0; i < clause.size(); ++i) {
minisat_clause.push(toMinisatLit(clause[i]));
}
Assert(clause.size() == (unsigned)minisat_clause.size());
}
void MinisatSatSolver::toSatClause(Minisat::vec<Minisat::Lit>& clause,
SatClause& sat_clause) {
for (int i = 0; i < clause.size(); ++i) {
sat_clause.push_back(toSatLiteral(clause[i]));
}
Assert((unsigned)clause.size() == sat_clause.size());
}
void MinisatSatSolver::initialize(context::Context* context, TheoryProxy* theoryProxy)
{
d_context = context;
// Create the solver
d_minisat = new Minisat::SimpSolver(theoryProxy, d_context,
Options::current()->incrementalSolving ||
Options::current()->decisionMode == Options::DECISION_STRATEGY_JUSTIFICATION );
// Setup the verbosity
d_minisat->verbosity = (Options::current()->verbosity > 0) ? 1 : -1;
// Setup the random decision parameters
d_minisat->random_var_freq = Options::current()->satRandomFreq;
d_minisat->random_seed = Options::current()->satRandomSeed;
// Give access to all possible options in the sat solver
d_minisat->var_decay = Options::current()->satVarDecay;
d_minisat->clause_decay = Options::current()->satClauseDecay;
d_minisat->restart_first = Options::current()->satRestartFirst;
d_minisat->restart_inc = Options::current()->satRestartInc;
d_statistics.init(d_minisat);
}
void MinisatSatSolver::addClause(SatClause& clause, bool removable) {
Minisat::vec<Minisat::Lit> minisat_clause;
toMinisatClause(clause, minisat_clause);
d_minisat->addClause(minisat_clause, removable);
}
SatVariable MinisatSatSolver::newVar(bool theoryAtom) {
return d_minisat->newVar(true, true, theoryAtom);
}
SatValue MinisatSatSolver::solve(unsigned long& resource) {
Trace("limit") << "SatSolver::solve(): have limit of " << resource << " conflicts" << std::endl;
if(resource == 0) {
d_minisat->budgetOff();
} else {
d_minisat->setConfBudget(resource);
}
Minisat::vec<Minisat::Lit> empty;
unsigned long conflictsBefore = d_minisat->conflicts;
SatValue result = toSatLiteralValue(d_minisat->solveLimited(empty));
d_minisat->clearInterrupt();
resource = d_minisat->conflicts - conflictsBefore;
Trace("limit") << "SatSolver::solve(): it took " << resource << " conflicts" << std::endl;
return result;
}
SatValue MinisatSatSolver::solve() {
d_minisat->budgetOff();
return toSatLiteralValue(d_minisat->solve());
}
void MinisatSatSolver::interrupt() {
d_minisat->interrupt();
}
SatValue MinisatSatSolver::value(SatLiteral l) {
return toSatLiteralValue(d_minisat->value(toMinisatLit(l)));
}
SatValue MinisatSatSolver::modelValue(SatLiteral l){
return toSatLiteralValue(d_minisat->modelValue(toMinisatLit(l)));
}
bool MinisatSatSolver::properExplanation(SatLiteral lit, SatLiteral expl) const {
return true;
}
/** Incremental interface */
unsigned MinisatSatSolver::getAssertionLevel() const {
return d_minisat->getAssertionLevel();
}
void MinisatSatSolver::push() {
d_minisat->push();
}
void MinisatSatSolver::pop(){
d_minisat->pop();
}
void MinisatSatSolver::unregisterVar(SatLiteral lit) {
d_minisat->unregisterVar(toMinisatLit(lit));
}
void MinisatSatSolver::renewVar(SatLiteral lit, int level) {
d_minisat->renewVar(toMinisatLit(lit), level);
}
/// Statistics for MinisatSatSolver
MinisatSatSolver::Statistics::Statistics() :
d_statStarts("sat::starts"),
d_statDecisions("sat::decisions"),
d_statRndDecisions("sat::rnd_decisions"),
d_statPropagations("sat::propagations"),
d_statConflicts("sat::conflicts"),
d_statClausesLiterals("sat::clauses_literals"),
d_statLearntsLiterals("sat::learnts_literals"),
d_statMaxLiterals("sat::max_literals"),
d_statTotLiterals("sat::tot_literals")
{
StatisticsRegistry::registerStat(&d_statStarts);
StatisticsRegistry::registerStat(&d_statDecisions);
StatisticsRegistry::registerStat(&d_statRndDecisions);
StatisticsRegistry::registerStat(&d_statPropagations);
StatisticsRegistry::registerStat(&d_statConflicts);
StatisticsRegistry::registerStat(&d_statClausesLiterals);
StatisticsRegistry::registerStat(&d_statLearntsLiterals);
StatisticsRegistry::registerStat(&d_statMaxLiterals);
StatisticsRegistry::registerStat(&d_statTotLiterals);
}
MinisatSatSolver::Statistics::~Statistics() {
StatisticsRegistry::unregisterStat(&d_statStarts);
StatisticsRegistry::unregisterStat(&d_statDecisions);
StatisticsRegistry::unregisterStat(&d_statRndDecisions);
StatisticsRegistry::unregisterStat(&d_statPropagations);
StatisticsRegistry::unregisterStat(&d_statConflicts);
StatisticsRegistry::unregisterStat(&d_statClausesLiterals);
StatisticsRegistry::unregisterStat(&d_statLearntsLiterals);
StatisticsRegistry::unregisterStat(&d_statMaxLiterals);
StatisticsRegistry::unregisterStat(&d_statTotLiterals);
}
void MinisatSatSolver::Statistics::init(Minisat::SimpSolver* d_minisat){
d_statStarts.setData(d_minisat->starts);
d_statDecisions.setData(d_minisat->decisions);
d_statRndDecisions.setData(d_minisat->rnd_decisions);
d_statPropagations.setData(d_minisat->propagations);
d_statConflicts.setData(d_minisat->conflicts);
d_statClausesLiterals.setData(d_minisat->clauses_literals);
d_statLearntsLiterals.setData(d_minisat->learnts_literals);
d_statMaxLiterals.setData(d_minisat->max_literals);
d_statTotLiterals.setData(d_minisat->tot_literals);
}
|
