1 #include "satencoder.h"
5 #include "constraint.h"
9 #include "tableentry.h"
12 #include "predicate.h"
16 SATEncoder::SATEncoder(CSolver *_solver) :
19 vector(allocDefVectorEdge()) {
22 SATEncoder::~SATEncoder() {
24 deleteVectorEdge(vector);
27 void SATEncoder::resetSATEncoder() {
32 int SATEncoder::solve(long timeout) {
33 cnf->solver->timeout = timeout;
37 void SATEncoder::encodeAllSATEncoder(CSolver *csolver) {
38 if (csolver->isUnSAT()) {
41 SetIteratorBooleanEdge *iterator = csolver->getConstraints();
42 while (iterator->hasNext()) {
43 BooleanEdge constraint = iterator->next();
44 Edge c = encodeConstraintSATEncoder(constraint);
45 addConstraintCNF(cnf, c);
50 Edge SATEncoder::encodeConstraintSATEncoder(BooleanEdge c) {
52 Boolean *constraint = c.getBoolean();
54 if (booledgeMap.contains(constraint)) {
55 Edge e = {(Node *) booledgeMap.get(constraint)};
56 return c.isNegated() ? constraintNegate(e) : e;
59 switch (constraint->type) {
61 result = encodeOrderSATEncoder((BooleanOrder *) constraint);
64 result = encodeVarSATEncoder((BooleanVar *) constraint);
67 result = encodeLogicSATEncoder((BooleanLogic *) constraint);
70 result = encodePredicateSATEncoder((BooleanPredicate *) constraint);
73 result = ((BooleanConst *) constraint)->isTrue() ? E_True : E_False;
76 model_print("Unhandled case in encodeConstraintSATEncoder %u", constraint->type);
79 Polarity p = constraint->polarity;
80 uint pSize = constraint->parents.getSize();
82 if ( !edgeIsVarConst(result) && pSize > (uint)solver->getTuner()->getTunable(PROXYVARIABLE, &proxyparameter) ) {
83 Edge e = getNewVarSATEncoder();
84 generateProxy(cnf, result, e, p);
85 booledgeMap.put(constraint, e.node_ptr);
89 return c.isNegated() ? constraintNegate(result) : result;
92 void SATEncoder::getArrayNewVarsSATEncoder(uint num, Edge *carray) {
93 for (uint i = 0; i < num; i++)
94 carray[i] = getNewVarSATEncoder();
97 Edge SATEncoder::getNewVarSATEncoder() {
98 return constraintNewVar(cnf);
101 Edge SATEncoder::encodeVarSATEncoder(BooleanVar *constraint) {
102 if (edgeIsNull(constraint->var)) {
103 constraint->var = getNewVarSATEncoder();
105 return constraint->var;
108 Edge SATEncoder::encodeLogicSATEncoder(BooleanLogic *constraint) {
109 Edge array[constraint->inputs.getSize()];
110 for (uint i = 0; i < constraint->inputs.getSize(); i++)
111 array[i] = encodeConstraintSATEncoder(constraint->inputs.get(i));
113 switch (constraint->op) {
115 return constraintAND(cnf, constraint->inputs.getSize(), array);
117 return constraintNegate(array[0]);
119 ASSERT(constraint->inputs.getSize() == 2);
120 return constraintIFF(cnf, array[0], array[1]);
124 //Don't handle, translate these away...
126 model_print("Unhandled case in encodeLogicSATEncoder %u", constraint->op);
131 Edge SATEncoder::encodePredicateSATEncoder(BooleanPredicate *constraint) {
132 switch (constraint->predicate->type) {
134 return encodeTablePredicateSATEncoder(constraint);
136 return encodeOperatorPredicateSATEncoder(constraint);
143 Edge SATEncoder::encodeTablePredicateSATEncoder(BooleanPredicate *constraint) {
144 switch (constraint->encoding.type) {
145 case ENUMERATEIMPLICATIONS:
146 case ENUMERATEIMPLICATIONSNEGATE:
147 return encodeEnumTablePredicateSATEncoder(constraint);
157 void SATEncoder::encodeElementSATEncoder(Element *element) {
158 /* Check to see if we have already encoded this element. */
159 if (element->getElementEncoding()->variables != NULL)
162 /* Need to encode. */
163 switch ( element->type) {
165 generateElementEncoding(element);
166 encodeElementFunctionSATEncoder((ElementFunction *) element);
169 generateElementEncoding(element);
178 void SATEncoder::encodeElementFunctionSATEncoder(ElementFunction *function) {
179 switch (function->getFunction()->type) {
181 encodeTableElementFunctionSATEncoder(function);
184 encodeOperatorElementFunctionSATEncoder(function);
191 void SATEncoder::encodeTableElementFunctionSATEncoder(ElementFunction *function) {
192 switch (function->getElementFunctionEncoding()->type) {
193 case ENUMERATEIMPLICATIONS:
194 encodeEnumTableElemFunctionSATEncoder(function);