#include "tableentry.h"
#include "table.h"
#include "order.h"
-
+#include "predicate.h"
+#include "orderpair.h"
+#include "set.h"
SATEncoder * allocSATEncoder() {
SATEncoder *This=ourmalloc(sizeof (SATEncoder));
This->varcount=1;
+ This->satSolver = allocIncrementalSolver();
return This;
}
void deleteSATEncoder(SATEncoder *This) {
+ deleteIncrementalSolver(This->satSolver);
ourfree(This);
}
-void initializeConstraintVars(CSolver* csolver, SATEncoder* This){
- /** We really should not walk the free list to generate constraint
- variables...walk the constraint tree instead. Or even better
- yet, just do this as you need to during the encodeAllSATEncoder
- walk. */
-
- FIXME!!!!(); // Make sure Hamed sees comment above
+Constraint * getElementValueConstraint(SATEncoder* encoder,Element* This, uint64_t value) {
+ generateElementEncodingVariables(encoder, getElementEncoding(This));
+ switch(getElementEncoding(This)->type){
+ case ONEHOT:
+ //FIXME
+ ASSERT(0);
+ break;
+ case UNARY:
+ ASSERT(0);
+ break;
+ case BINARYINDEX:
+ return getElementValueBinaryIndexConstraint(This, value);
+ break;
+ case ONEHOTBINARY:
+ ASSERT(0);
+ break;
+ case BINARYVAL:
+ ASSERT(0);
+ break;
+ default:
+ ASSERT(0);
+ break;
+ }
+ return NULL;
+}
+Constraint * getElementValueBinaryIndexConstraint(Element* This, uint64_t value) {
+ ASTNodeType type = GETELEMENTTYPE(This);
+ ASSERT(type == ELEMSET || type == ELEMFUNCRETURN);
+ ElementEncoding* elemEnc = getElementEncoding(This);
+ for(uint i=0; i<elemEnc->encArraySize; i++){
+ if( isinUseElement(elemEnc, i) && elemEnc->encodingArray[i]==value){
+ return generateBinaryConstraint(elemEnc->numVars,
+ elemEnc->variables, i);
+ }
+ }
+ return NULL;
+}
- uint size = getSizeVectorElement(csolver->allElements);
- for(uint i=0; i<size; i++){
- Element* element = getVectorElement(csolver->allElements, i);
- generateElementEncodingVariables(This,getElementEncoding(element));
+void addConstraintToSATSolver(Constraint *c, IncrementalSolver* satSolver) {
+ VectorConstraint* simplified = simplifyConstraint(c);
+ uint size = getSizeVectorConstraint(simplified);
+ for(uint i=0; i<size; i++) {
+ Constraint *simp=getVectorConstraint(simplified, i);
+ if (simp->type==TRUE)
+ continue;
+ ASSERT(simp->type!=FALSE);
+ dumpConstraint(simp, satSolver);
+ freerecConstraint(simp);
}
+ deleteVectorConstraint(simplified);
}
void encodeAllSATEncoder(CSolver *csolver, SATEncoder * This) {
uint size=getSizeVectorBoolean(constraints);
for(uint i=0;i<size;i++) {
Boolean *constraint=getVectorBoolean(constraints, i);
- encodeConstraintSATEncoder(This, constraint);
- }
-
- size = getSizeVectorElement(csolver->allElements);
- for(uint i=0; i<size; i++){
- Element* element = getVectorElement(csolver->allElements, i);
- switch(GETELEMENTTYPE(element)){
- case ELEMFUNCRETURN:
- encodeFunctionElementSATEncoder(This, (ElementFunction*) element);
- break;
- default:
- continue;
- //ElementSets that aren't used in any constraints/functions
- //will be eliminated.
- }
+ Constraint* c= encodeConstraintSATEncoder(This, constraint);
+ printConstraint(c);
+ model_print("\n\n");
+ addConstraintToSATSolver(c, This->satSolver);
+ //FIXME: When do we want to delete constraints? Should we keep an array of them
+ // and delete them later, or it would be better to just delete them right away?
}
}
case L_OR:
return allocArrayConstraint(OR, getSizeArrayBoolean(&constraint->inputs), array);
case L_NOT:
- ASSERT(constraint->numArray==1);
+ ASSERT( getSizeArrayBoolean(&constraint->inputs)==1);
return negateConstraint(array[0]);
case L_XOR: {
- ASSERT(constraint->numArray==2);
+ ASSERT( getSizeArrayBoolean(&constraint->inputs)==2);
Constraint * nleft=negateConstraint(cloneConstraint(array[0]));
Constraint * nright=negateConstraint(cloneConstraint(array[1]));
return allocConstraint(OR,
allocConstraint(AND, nleft, array[1]));
}
case L_IMPLIES:
- ASSERT(constraint->numArray==2);
+ ASSERT( getSizeArrayBoolean( &constraint->inputs)==2);
return allocConstraint(IMPLIES, array[0], array[1]);
default:
model_print("Unhandled case in encodeLogicSATEncoder %u", constraint->op);
}
}
+
Constraint * encodeOrderSATEncoder(SATEncoder *This, BooleanOrder * constraint) {
- if(constraint->var== NULL){
- constraint->var = getNewVarSATEncoder(This);
+ switch( constraint->order->type){
+ case PARTIAL:
+ return encodePartialOrderSATEncoder(This, constraint);
+ case TOTAL:
+ return encodeTotalOrderSATEncoder(This, constraint);
+ default:
+ ASSERT(0);
}
- return constraint->var;
+ return NULL;
}
-Constraint * encodePredicateSATEncoder(SATEncoder * This, BooleanPredicate * constraint) {
- //TO IMPLEMENT
+Constraint * getPairConstraint(SATEncoder *This, HashTableBoolConst * table, OrderPair * pair) {
+ bool negate = false;
+ OrderPair flipped;
+ if (pair->first > pair->second) {
+ negate=true;
+ flipped.first=pair->second;
+ flipped.second=pair->first;
+ pair = &flipped; //FIXME: accessing a local variable from outside of the function?
+ }
+ Constraint * constraint;
+ if (!containsBoolConst(table, pair)) {
+ constraint = getNewVarSATEncoder(This);
+ OrderPair * paircopy = allocOrderPair(pair->first, pair->second, constraint);
+ putBoolConst(table, paircopy, paircopy);
+ } else
+ constraint = getBoolConst(table, pair)->constraint;
+ if (negate)
+ return negateConstraint(constraint);
+ else
+ return constraint;
+}
+
+Constraint * encodeTotalOrderSATEncoder(SATEncoder *This, BooleanOrder * boolOrder){
+ ASSERT(boolOrder->order->type == TOTAL);
+ if(boolOrder->order->boolsToConstraints == NULL){
+ initializeOrderHashTable(boolOrder->order);
+ return createAllTotalOrderConstraintsSATEncoder(This, boolOrder->order);
+ }
+ HashTableBoolConst* boolToConsts = boolOrder->order->boolsToConstraints;
+ OrderPair pair={boolOrder->first, boolOrder->second, NULL};
+ Constraint *constraint = getPairConstraint(This, boolToConsts, & pair);
+ return constraint;
+}
+
+Constraint* createAllTotalOrderConstraintsSATEncoder(SATEncoder* This, Order* order){
+ ASSERT(order->type == TOTAL);
+ VectorInt* mems = order->set->members;
+ HashTableBoolConst* table = order->boolsToConstraints;
+ uint size = getSizeVectorInt(mems);
+ Constraint* constraints [size*size];
+ uint csize =0;
+ for(uint i=0; i<size; i++){
+ uint64_t valueI = getVectorInt(mems, i);
+ for(uint j=i+1; j<size;j++){
+ uint64_t valueJ = getVectorInt(mems, j);
+ OrderPair pairIJ = {valueI, valueJ};
+ Constraint* constIJ=getPairConstraint(This, table, & pairIJ);
+ for(uint k=j+1; k<size; k++){
+ uint64_t valueK = getVectorInt(mems, k);
+ OrderPair pairJK = {valueJ, valueK};
+ OrderPair pairIK = {valueI, valueK};
+ Constraint* constIK = getPairConstraint(This, table, & pairIK);
+ Constraint* constJK = getPairConstraint(This, table, & pairJK);
+ constraints[csize++] = generateTransOrderConstraintSATEncoder(This, constIJ, constJK, constIK);
+ ASSERT(csize < size*size);
+ }
+ }
+ }
+ return allocArrayConstraint(AND, csize, constraints);
+}
+
+Constraint* getOrderConstraint(HashTableBoolConst *table, OrderPair *pair){
+ ASSERT(pair->first!= pair->second);
+ Constraint* constraint= getBoolConst(table, pair)->constraint;
+ if(pair->first > pair->second)
+ return constraint;
+ else
+ return negateConstraint(constraint);
+}
+
+Constraint * generateTransOrderConstraintSATEncoder(SATEncoder *This, Constraint *constIJ,Constraint *constJK,Constraint *constIK){
+ //FIXME: first we should add the the constraint to the satsolver!
+ ASSERT(constIJ!= NULL && constJK != NULL && constIK != NULL);
+ Constraint *carray[] = {constIJ, constJK, negateConstraint(constIK)};
+ Constraint * loop1= allocArrayConstraint(OR, 3, carray);
+ Constraint * carray2[] = {negateConstraint(constIJ), negateConstraint(constJK), constIK};
+ Constraint * loop2= allocArrayConstraint(OR, 3,carray2 );
+ return allocConstraint(AND, loop1, loop2);
+}
+
+Constraint * encodePartialOrderSATEncoder(SATEncoder *This, BooleanOrder * constraint){
+ // FIXME: we can have this implementation for partial order. Basically,
+ // we compute the transitivity between two order constraints specified by the client! (also can be used
+ // when client specify sparse constraints for the total order!)
+ ASSERT(constraint->order->type == PARTIAL);
+/*
+ HashTableBoolConst* boolToConsts = boolOrder->order->boolsToConstraints;
+ if( containsBoolConst(boolToConsts, boolOrder) ){
+ return getBoolConst(boolToConsts, boolOrder);
+ } else {
+ Constraint* constraint = getNewVarSATEncoder(This);
+ putBoolConst(boolToConsts,boolOrder, constraint);
+ VectorBoolean* orderConstrs = &boolOrder->order->constraints;
+ uint size= getSizeVectorBoolean(orderConstrs);
+ for(uint i=0; i<size; i++){
+ ASSERT(GETBOOLEANTYPE( getVectorBoolean(orderConstrs, i)) == ORDERCONST );
+ BooleanOrder* tmp = (BooleanOrder*)getVectorBoolean(orderConstrs, i);
+ BooleanOrder* newBool;
+ Constraint* first, *second;
+ if(tmp->second==boolOrder->first){
+ newBool = (BooleanOrder*)allocBooleanOrder(tmp->order,tmp->first,boolOrder->second);
+ first = encodeTotalOrderSATEncoder(This, tmp);
+ second = constraint;
+
+ }else if (boolOrder->second == tmp->first){
+ newBool = (BooleanOrder*)allocBooleanOrder(tmp->order,boolOrder->first,tmp->second);
+ first = constraint;
+ second = encodeTotalOrderSATEncoder(This, tmp);
+ }else
+ continue;
+ Constraint* transConstr= encodeTotalOrderSATEncoder(This, newBool);
+ generateTransOrderConstraintSATEncoder(This, first, second, transConstr );
+ }
+ return constraint;
+ }
+*/
+ return NULL;
+}
+
+Constraint * encodePredicateSATEncoder(SATEncoder * This, BooleanPredicate * constraint) {
+ switch(GETPREDICATETYPE(constraint->predicate) ){
+ case TABLEPRED:
+ return encodeTablePredicateSATEncoder(This, constraint);
+ case OPERATORPRED:
+ return encodeOperatorPredicateSATEncoder(This, constraint);
+ default:
+ ASSERT(0);
+ }
+ return NULL;
+}
+
+Constraint * encodeTablePredicateSATEncoder(SATEncoder * This, BooleanPredicate * constraint){
+ switch(constraint->encoding.type){
+ case ENUMERATEIMPLICATIONS:
+ case ENUMERATEIMPLICATIONSNEGATE:
+ return encodeEnumTablePredicateSATEncoder(This, constraint);
+ case CIRCUIT:
+ ASSERT(0);
+ break;
+ default:
+ ASSERT(0);
+ }
+ return NULL;
+}
+
+Constraint * encodeEnumTablePredicateSATEncoder(SATEncoder * This, BooleanPredicate * constraint){
+ VectorTableEntry* entries = &(((PredicateTable*)constraint->predicate)->table->entries);
+ FunctionEncodingType encType = constraint->encoding.type;
+ uint size = getSizeVectorTableEntry(entries);
+ Constraint* constraints[size];
+ for(uint i=0; i<size; i++){
+ TableEntry* entry = getVectorTableEntry(entries, i);
+ if(encType==ENUMERATEIMPLICATIONS && entry->output!= true)
+ continue;
+ else if(encType==ENUMERATEIMPLICATIONSNEGATE && entry->output !=false)
+ continue;
+ ArrayElement* inputs = &constraint->inputs;
+ uint inputNum =getSizeArrayElement(inputs);
+ Constraint* carray[inputNum];
+ for(uint j=0; j<inputNum; j++){
+ Element* el = getArrayElement(inputs, j);
+ Constraint* tmpc = getElementValueConstraint(This,el, entry->inputs[j]);
+ ASSERT(tmpc!= NULL);
+ if( GETELEMENTTYPE(el) == ELEMFUNCRETURN){
+ Constraint* func =encodeFunctionElementSATEncoder(This, (ElementFunction*) el);
+ ASSERT(func!=NULL);
+ carray[j] = allocConstraint(AND, func, tmpc);
+ } else {
+ carray[j] = tmpc;
+ }
+ ASSERT(carray[j]!= NULL);
+ }
+ constraints[i]=allocArrayConstraint(AND, inputNum, carray);
+ }
+ Constraint* result= allocArrayConstraint(OR, size, constraints);
+ //FIXME: if it didn't match with any entry
+ return encType==ENUMERATEIMPLICATIONS? result: negateConstraint(result);
+}
+
+Constraint * encodeOperatorPredicateSATEncoder(SATEncoder * This, BooleanPredicate * constraint){
+ switch(constraint->encoding.type){
+ case ENUMERATEIMPLICATIONS:
+ return encodeEnumOperatorPredicateSATEncoder(This, constraint);
+ case CIRCUIT:
+ ASSERT(0);
+ break;
+ default:
+ ASSERT(0);
+ }
return NULL;
}
+Constraint * encodeEnumOperatorPredicateSATEncoder(SATEncoder * This, BooleanPredicate * constraint){
+ ASSERT(GETPREDICATETYPE(constraint->predicate)==OPERATORPRED);
+ PredicateOperator* predicate = (PredicateOperator*)constraint->predicate;
+ ASSERT(predicate->op == EQUALS); //For now, we just only support equals
+ //getting maximum size of in common elements between two sets!
+ uint size=getSizeVectorInt( getArraySet( &predicate->domains, 0)->members);
+ uint64_t commonElements [size];
+ getEqualitySetIntersection(predicate, &size, commonElements);
+ Constraint* carray[size];
+ Element* elem1 = getArrayElement( &constraint->inputs, 0);
+ Constraint *elemc1 = NULL, *elemc2 = NULL;
+ if( GETELEMENTTYPE(elem1) == ELEMFUNCRETURN)
+ elemc1 = encodeFunctionElementSATEncoder(This, (ElementFunction*) elem1);
+ Element* elem2 = getArrayElement( &constraint->inputs, 1);
+ if( GETELEMENTTYPE(elem2) == ELEMFUNCRETURN)
+ elemc2 = encodeFunctionElementSATEncoder(This, (ElementFunction*) elem2);
+ for(uint i=0; i<size; i++){
+ Constraint* arg1 = getElementValueConstraint(This, elem1, commonElements[i]);
+ ASSERT(arg1!=NULL);
+ Constraint* arg2 = getElementValueConstraint(This, elem2, commonElements[i]);
+ ASSERT(arg2 != NULL);
+ carray[i] = allocConstraint(AND, arg1, arg2);
+ }
+ //FIXME: the case when there is no intersection ....
+ Constraint* result = allocArrayConstraint(OR, size, carray);
+ ASSERT(result!= NULL);
+ if(elemc1!= NULL)
+ result = allocConstraint(AND, result, elemc1);
+ if(elemc2 != NULL)
+ result = allocConstraint (AND, result, elemc2);
+ return result;
+}
+
Constraint* encodeFunctionElementSATEncoder(SATEncoder* encoder, ElementFunction *This){
switch(GETFUNCTIONTYPE(This->function)){
case TABLEFUNC:
}
Constraint* encodeOperatorElementFunctionSATEncoder(SATEncoder* encoder, ElementFunction* This){
- //FIXME: for now it just adds/substracts inputs exhustively
- return NULL;
+ ASSERT(GETFUNCTIONTYPE(This->function) == OPERATORFUNC);
+ ASSERT(getSizeArrayElement(&This->inputs)==2 );
+ ElementEncoding* elem1 = getElementEncoding( getArrayElement(&This->inputs,0) );
+ ElementEncoding* elem2 = getElementEncoding( getArrayElement(&This->inputs,1) );
+ Constraint* carray[elem1->encArraySize*elem2->encArraySize];
+ uint size=0;
+ Constraint* overFlowConstraint = ((BooleanVar*) This->overflowstatus)->var;
+ for(uint i=0; i<elem1->encArraySize; i++){
+ if(isinUseElement(elem1, i)){
+ for( uint j=0; j<elem2->encArraySize; j++){
+ if(isinUseElement(elem2, j)){
+ bool isInRange = false;
+ uint64_t result= applyFunctionOperator((FunctionOperator*)This->function,elem1->encodingArray[i],
+ elem2->encodingArray[j], &isInRange);
+ //FIXME: instead of getElementValueConstraint, it might be useful to have another function
+ // that doesn't iterate over encodingArray and treats more efficient ...
+ Constraint* valConstrIn1 = getElementValueConstraint(encoder, elem1->element, elem1->encodingArray[i]);
+ ASSERT(valConstrIn1 != NULL);
+ Constraint* valConstrIn2 = getElementValueConstraint(encoder, elem2->element, elem2->encodingArray[j]);
+ ASSERT(valConstrIn2 != NULL);
+ Constraint* valConstrOut = getElementValueConstraint(encoder, (Element*) This, result);
+ if(valConstrOut == NULL)
+ continue; //FIXME:Should talk to brian about it!
+ Constraint* OpConstraint = allocConstraint(IMPLIES,
+ allocConstraint(AND, valConstrIn1, valConstrIn2) , valConstrOut);
+ switch( ((FunctionOperator*)This->function)->overflowbehavior ){
+ case IGNORE:
+ if(isInRange){
+ carray[size++] = OpConstraint;
+ }
+ break;
+ case WRAPAROUND:
+ carray[size++] = OpConstraint;
+ break;
+ case FLAGFORCESOVERFLOW:
+ if(isInRange){
+ Constraint* const1 = allocConstraint(IMPLIES,
+ allocConstraint(AND, valConstrIn1, valConstrIn2),
+ negateConstraint(overFlowConstraint));
+ carray[size++] = allocConstraint(AND, const1, OpConstraint);
+ }
+ break;
+ case OVERFLOWSETSFLAG:
+ if(isInRange){
+ carray[size++] = OpConstraint;
+ } else{
+ carray[size++] = allocConstraint(IMPLIES,
+ allocConstraint(AND, valConstrIn1, valConstrIn2),
+ overFlowConstraint);
+ }
+ break;
+ case FLAGIFFOVERFLOW:
+ if(isInRange){
+ Constraint* const1 = allocConstraint(IMPLIES,
+ allocConstraint(AND, valConstrIn1, valConstrIn2),
+ negateConstraint(overFlowConstraint));
+ carray[size++] = allocConstraint(AND, const1, OpConstraint);
+ }else{
+ carray[size++] = allocConstraint(IMPLIES,
+ allocConstraint(AND, valConstrIn1, valConstrIn2),
+ overFlowConstraint);
+ }
+ break;
+ case NOOVERFLOW:
+ if(!isInRange){
+ ASSERT(0);
+ }
+ carray[size++] = OpConstraint;
+ break;
+ default:
+ ASSERT(0);
+ }
+
+ }
+ }
+ }
+ }
+ return allocArrayConstraint(AND, size, carray);
}
Constraint* encodeEnumTableElemFunctionSATEncoder(SATEncoder* encoder, ElementFunction* This){
for(uint i=0; i<size; i++){
TableEntry* entry = getVectorTableEntry(&table->entries, i);
uint inputNum =getSizeArrayElement(elements);
- Element* el= getArrayElement(elements, i);
Constraint* carray[inputNum];
for(uint j=0; j<inputNum; j++){
- FIXME!!!!();
- //This next line should not assume a particular encoding type for the element... just a generic element encoding function that should choose the appropriate encoding...
-
- carray[inputNum] = getElementValueBinaryIndexConstraint(el, entry->inputs[j]);
+ Element* el= getArrayElement(elements, j);
+ carray[j] = getElementValueConstraint(encoder, el, entry->inputs[j]);
+ ASSERT(carray[j]!= NULL);
}
- Constraint* row= allocConstraint(IMPLIES, allocArrayConstraint(AND, inputNum, carray),
- getElementValueBinaryIndexConstraint((Element*)This, entry->output));
+ Constraint* output = getElementValueConstraint(encoder, (Element*)This, entry->output);
+ ASSERT(output!= NULL);
+ Constraint* row= allocConstraint(IMPLIES, allocArrayConstraint(AND, inputNum, carray), output);
constraints[i]=row;
}
Constraint* result = allocArrayConstraint(OR, size, constraints);
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