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
|
/********************* */
/*! \file theory_quantifiers.cpp
** \verbatim
** Original author: ajreynol
** Major contributors: none
** Minor contributors (to current version): none
** 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 Implementation of the theory of quantifiers
**
** Implementation of the theory of quantifiers.
**/
#include "theory/quantifiers/theory_quantifiers.h"
#include "theory/valuation.h"
#include "theory/quantifiers_engine.h"
#include "theory/quantifiers/instantiation_engine.h"
#include "theory/quantifiers/model_engine.h"
#include "expr/kind.h"
#include "util/Assert.h"
#include <map>
#include <time.h>
#include "theory/quantifiers/theory_quantifiers_instantiator.h"
#include "theory/quantifiers/options.h"
#include "theory/quantifiers/term_database.h"
using namespace std;
using namespace CVC4;
using namespace CVC4::kind;
using namespace CVC4::context;
using namespace CVC4::theory;
using namespace CVC4::theory::quantifiers;
TheoryQuantifiers::TheoryQuantifiers(Context* c, context::UserContext* u, OutputChannel& out, Valuation valuation, const LogicInfo& logicInfo, QuantifiersEngine* qe) :
Theory(THEORY_QUANTIFIERS, c, u, out, valuation, logicInfo, qe),
d_numRestarts(0){
d_numInstantiations = 0;
d_baseDecLevel = -1;
}
TheoryQuantifiers::~TheoryQuantifiers() {
}
void TheoryQuantifiers::addSharedTerm(TNode t) {
Debug("quantifiers-other") << "TheoryQuantifiers::addSharedTerm(): "
<< t << endl;
}
void TheoryQuantifiers::notifyEq(TNode lhs, TNode rhs) {
Debug("quantifiers-other") << "TheoryQuantifiers::notifyEq(): "
<< lhs << " = " << rhs << endl;
}
void TheoryQuantifiers::preRegisterTerm(TNode n) {
Debug("quantifiers-prereg") << "TheoryQuantifiers::preRegisterTerm() " << n << endl;
if( n.getKind()==FORALL && !n.hasAttribute(InstConstantAttribute()) ){
getQuantifiersEngine()->registerQuantifier( n );
}
}
void TheoryQuantifiers::presolve() {
Debug("quantifiers-presolve") << "TheoryQuantifiers::presolve()" << endl;
}
Node TheoryQuantifiers::getValue(TNode n) {
//NodeManager* nodeManager = NodeManager::currentNM();
switch(n.getKind()) {
case FORALL:
case EXISTS:
bool value;
if( d_valuation.hasSatValue( n, value ) ){
return NodeManager::currentNM()->mkConst(value);
}else{
return NodeManager::currentNM()->mkConst(false); //FIX_THIS?
}
break;
default:
Unhandled(n.getKind());
}
}
void TheoryQuantifiers::collectModelInfo( TheoryModel* m ){
}
void TheoryQuantifiers::check(Effort e) {
CodeTimer codeTimer(d_theoryTime);
Debug("quantifiers-check") << "quantifiers::check(" << e << ")" << std::endl;
while(!done()) {
Node assertion = get();
Debug("quantifiers-assert") << "quantifiers::assert(): " << assertion << std::endl;
switch(assertion.getKind()) {
case kind::FORALL:
assertUniversal( assertion );
break;
case kind::NOT:
{
switch( assertion[0].getKind()) {
case kind::FORALL:
assertExistential( assertion );
break;
default:
Unhandled(assertion[0].getKind());
break;
}
}
break;
default:
Unhandled(assertion.getKind());
break;
}
}
// call the quantifiers engine to check
getQuantifiersEngine()->check( e );
}
void TheoryQuantifiers::propagate(Effort level){
CodeTimer codeTimer(d_theoryTime);
getQuantifiersEngine()->propagate( level );
}
void TheoryQuantifiers::assertUniversal( Node n ){
Assert( n.getKind()==FORALL );
if( !n.hasAttribute(InstConstantAttribute()) ){
getQuantifiersEngine()->registerQuantifier( n );
getQuantifiersEngine()->assertNode( n );
}
}
void TheoryQuantifiers::assertExistential( Node n ){
Assert( n.getKind()== NOT && n[0].getKind()==FORALL );
if( !n[0].hasAttribute(InstConstantAttribute()) ){
if( d_skolemized.find( n )==d_skolemized.end() ){
Node body = getQuantifiersEngine()->getTermDatabase()->getSkolemizedBody( n[0] );
NodeBuilder<> nb(kind::OR);
nb << n[0] << body.notNode();
Node lem = nb;
Debug("quantifiers-sk") << "Skolemize lemma : " << lem << std::endl;
d_out->lemma( lem );
d_skolemized[n] = true;
}
}
}
bool TheoryQuantifiers::flipDecision(){
//Debug("quantifiers-flip") << "No instantiation given, flip decision, level = " << d_valuation.getDecisionLevel() << std::endl;
//for( int i=1; i<=(int)d_valuation.getDecisionLevel(); i++ ){
// Debug("quantifiers-flip") << " " << d_valuation.getDecision( i ) << std::endl;
//}
//if( d_valuation.getDecisionLevel()>0 ){
// double r = double(rand())/double(RAND_MAX);
// unsigned decisionLevel = (unsigned)(r*d_valuation.getDecisionLevel());
// d_out->flipDecision( decisionLevel );
// return true;
//}else{
// return false;
//}
if( !d_out->flipDecision() ){
return restart();
}
return true;
}
bool TheoryQuantifiers::restart(){
static const int restartLimit = 0;
if( d_numRestarts==restartLimit ){
Debug("quantifiers-flip") << "No more restarts." << std::endl;
return false;
}else{
d_numRestarts++;
Debug("quantifiers-flip") << "Do restart." << std::endl;
return true;
}
}
void TheoryQuantifiers::performCheck(Effort e){
getQuantifiersEngine()->check( e );
}
|
