1 #include "satencoder.h"
5 #include "constraint.h"
9 #include "tableentry.h"
12 #include "predicate.h"
15 SATEncoder::SATEncoder(CSolver *_solver) :
18 vector(allocDefVectorEdge()) {
21 SATEncoder::~SATEncoder() {
23 deleteVectorEdge(vector);
26 void SATEncoder::resetSATEncoder() {
31 int SATEncoder::solve() {
35 void SATEncoder::encodeAllSATEncoder(CSolver *csolver) {
36 SetIteratorBooleanEdge *iterator = csolver->getConstraints();
37 while (iterator->hasNext()) {
38 BooleanEdge constraint = iterator->next();
39 Edge c = encodeConstraintSATEncoder(constraint);
40 addConstraintCNF(cnf, c);
45 Edge SATEncoder::encodeConstraintSATEncoder(BooleanEdge c) {
47 Boolean *constraint = c.getBoolean();
49 if (booledgeMap.contains(constraint)) {
50 Edge e = {(Node *) booledgeMap.get(constraint)};
51 return c.isNegated() ? constraintNegate(e) : e;
54 switch (constraint->type) {
56 result = encodeOrderSATEncoder((BooleanOrder *) constraint);
59 result = encodeVarSATEncoder((BooleanVar *) constraint);
62 result = encodeLogicSATEncoder((BooleanLogic *) constraint);
65 result = encodePredicateSATEncoder((BooleanPredicate *) constraint);
68 model_print("Unhandled case in encodeConstraintSATEncoder %u", constraint->type);
71 Polarity p = constraint->polarity;
72 uint pSize = constraint->parents.getSize();
73 if ((pSize > 1 && p != P_BOTHTRUEFALSE ) || pSize > 2) {
74 Edge e = getNewVarSATEncoder();
75 generateProxy(cnf, result, e, p);
76 booledgeMap.put(constraint, e.node_ptr);
80 return c.isNegated() ? constraintNegate(result) : result;
83 void SATEncoder::getArrayNewVarsSATEncoder(uint num, Edge *carray) {
84 for (uint i = 0; i < num; i++)
85 carray[i] = getNewVarSATEncoder();
88 Edge SATEncoder::getNewVarSATEncoder() {
89 return constraintNewVar(cnf);
92 Edge SATEncoder::encodeVarSATEncoder(BooleanVar *constraint) {
93 if (edgeIsNull(constraint->var)) {
94 constraint->var = getNewVarSATEncoder();
96 return constraint->var;
99 Edge SATEncoder::encodeLogicSATEncoder(BooleanLogic *constraint) {
100 Edge array[constraint->inputs.getSize()];
101 for (uint i = 0; i < constraint->inputs.getSize(); i++)
102 array[i] = encodeConstraintSATEncoder(constraint->inputs.get(i));
104 switch (constraint->op) {
106 return constraintAND(cnf, constraint->inputs.getSize(), array);
108 return constraintNegate(array[0]);
110 ASSERT(constraint->inputs.getSize() == 2);
111 return constraintIFF(cnf, array[0], array[1]);
115 //Don't handle, translate these away...
117 model_print("Unhandled case in encodeLogicSATEncoder %u", constraint->op);
122 Edge SATEncoder::encodePredicateSATEncoder(BooleanPredicate *constraint) {
123 switch (constraint->predicate->type) {
125 return encodeTablePredicateSATEncoder(constraint);
127 return encodeOperatorPredicateSATEncoder(constraint);
134 Edge SATEncoder::encodeTablePredicateSATEncoder(BooleanPredicate *constraint) {
135 switch (constraint->encoding.type) {
136 case ENUMERATEIMPLICATIONS:
137 case ENUMERATEIMPLICATIONSNEGATE:
138 return encodeEnumTablePredicateSATEncoder(constraint);
148 void SATEncoder::encodeElementSATEncoder(Element *element) {
149 /* Check to see if we have already encoded this element. */
150 if (element->getElementEncoding()->variables != NULL)
153 /* Need to encode. */
154 switch ( element->type) {
156 generateElementEncoding(element);
157 encodeElementFunctionSATEncoder((ElementFunction *) element);
160 generateElementEncoding(element);
169 void SATEncoder::encodeElementFunctionSATEncoder(ElementFunction *function) {
170 switch (function->getFunction()->type) {
172 encodeTableElementFunctionSATEncoder(function);
175 encodeOperatorElementFunctionSATEncoder(function);
182 void SATEncoder::encodeTableElementFunctionSATEncoder(ElementFunction *function) {
183 switch (function->getElementFunctionEncoding()->type) {
184 case ENUMERATEIMPLICATIONS:
185 encodeEnumTableElemFunctionSATEncoder(function);