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() {
36 void SATEncoder::encodeAllSATEncoder(CSolver *csolver) {
37 SetIteratorBooleanEdge *iterator = csolver->getConstraints();
38 while (iterator->hasNext()) {
39 BooleanEdge constraint = iterator->next();
40 model_print("**********************************************************\n");
43 Edge c = encodeConstraintSATEncoder(constraint);
44 model_print("&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&\n");
47 addConstraintCNF(cnf, c);
52 Edge SATEncoder::encodeConstraintSATEncoder(BooleanEdge c) {
54 Boolean *constraint = c.getBoolean();
56 if (booledgeMap.contains(constraint)) {
57 Edge e = {(Node *) booledgeMap.get(constraint)};
58 return c.isNegated() ? constraintNegate(e) : e;
61 switch (constraint->type) {
63 result = encodeOrderSATEncoder((BooleanOrder *) constraint);
66 result = encodeVarSATEncoder((BooleanVar *) constraint);
69 result = encodeLogicSATEncoder((BooleanLogic *) constraint);
72 result = encodePredicateSATEncoder((BooleanPredicate *) constraint);
75 result = ((BooleanConst *) constraint)->isTrue() ? E_True : E_False;
78 model_print("Unhandled case in encodeConstraintSATEncoder %u", constraint->type);
81 Polarity p = constraint->polarity;
82 uint pSize = constraint->parents.getSize();
84 if ( !edgeIsVarConst(result) && pSize > (uint)solver->getTuner()->getTunable(PROXYVARIABLE, &proxyparameter) ) {
85 Edge e = getNewVarSATEncoder();
86 generateProxy(cnf, result, e, p);
87 booledgeMap.put(constraint, e.node_ptr);
91 return c.isNegated() ? constraintNegate(result) : result;
94 void SATEncoder::getArrayNewVarsSATEncoder(uint num, Edge *carray) {
95 for (uint i = 0; i < num; i++)
96 carray[i] = getNewVarSATEncoder();
99 Edge SATEncoder::getNewVarSATEncoder() {
100 return constraintNewVar(cnf);
103 Edge SATEncoder::encodeVarSATEncoder(BooleanVar *constraint) {
104 if (edgeIsNull(constraint->var)) {
105 constraint->var = getNewVarSATEncoder();
107 return constraint->var;
110 Edge SATEncoder::encodeLogicSATEncoder(BooleanLogic *constraint) {
111 Edge array[constraint->inputs.getSize()];
112 for (uint i = 0; i < constraint->inputs.getSize(); i++)
113 array[i] = encodeConstraintSATEncoder(constraint->inputs.get(i));
115 switch (constraint->op) {
117 return constraintAND(cnf, constraint->inputs.getSize(), array);
119 return constraintNegate(array[0]);
121 ASSERT(constraint->inputs.getSize() == 2);
122 return constraintIFF(cnf, array[0], array[1]);
126 //Don't handle, translate these away...
128 model_print("Unhandled case in encodeLogicSATEncoder %u", constraint->op);
133 Edge SATEncoder::encodePredicateSATEncoder(BooleanPredicate *constraint) {
134 switch (constraint->predicate->type) {
136 return encodeTablePredicateSATEncoder(constraint);
138 return encodeOperatorPredicateSATEncoder(constraint);
145 Edge SATEncoder::encodeTablePredicateSATEncoder(BooleanPredicate *constraint) {
146 switch (constraint->encoding.type) {
147 case ENUMERATEIMPLICATIONS:
148 case ENUMERATEIMPLICATIONSNEGATE:
149 return encodeEnumTablePredicateSATEncoder(constraint);
159 void SATEncoder::encodeElementSATEncoder(Element *element) {
160 /* Check to see if we have already encoded this element. */
161 if (element->getElementEncoding()->variables != NULL)
164 /* Need to encode. */
165 switch ( element->type) {
167 generateElementEncoding(element);
168 encodeElementFunctionSATEncoder((ElementFunction *) element);
171 generateElementEncoding(element);
180 void SATEncoder::encodeElementFunctionSATEncoder(ElementFunction *function) {
181 switch (function->getFunction()->type) {
183 encodeTableElementFunctionSATEncoder(function);
186 encodeOperatorElementFunctionSATEncoder(function);
193 void SATEncoder::encodeTableElementFunctionSATEncoder(ElementFunction *function) {
194 switch (function->getElementFunctionEncoding()->type) {
195 case ENUMERATEIMPLICATIONS:
196 encodeEnumTableElemFunctionSATEncoder(function);