src/Backend/satencoder.c

   1 #include "satencoder.h"
   2 #include "structs.h"
   3 #include "csolver.h"
   4 #include "boolean.h"
   5 #include "constraint.h"
   6 #include "common.h"
   7 #include "element.h"
   8 #include "function.h"
   9 #include "tableentry.h"
  10 #include "table.h"
  11 #include "order.h"
  12 #include "predicate.h"
  13 #include "orderpair.h"
  14 #include "set.h"
  15
  16 SATEncoder * allocSATEncoder() {
  17         SATEncoder *This=ourmalloc(sizeof (SATEncoder));
  18         This->varcount=1;
  19         This->satSolver = allocIncrementalSolver();
  20         return This;
  21 }
  22
  23 void deleteSATEncoder(SATEncoder *This) {
  24         deleteIncrementalSolver(This->satSolver);
  25         ourfree(This);
  26 }
  27
  28 Constraint * getElementValueConstraint(SATEncoder* encoder,Element* This, uint64_t value) {
  29         generateElementEncodingVariables(encoder, getElementEncoding(This));
  30         switch(getElementEncoding(This)->type){
  31                 case ONEHOT:
  32                         //FIXME
  33                         ASSERT(0);
  34                         break;
  35                 case UNARY:
  36                         ASSERT(0);
  37                         break;
  38                 case BINARYINDEX:
  39                         return getElementValueBinaryIndexConstraint(This, value);
  40                         break;
  41                 case ONEHOTBINARY:
  42                         ASSERT(0);
  43                         break;
  44                 case BINARYVAL:
  45                         ASSERT(0);
  46                         break;
  47                 default:
  48                         ASSERT(0);
  49                         break;
  50         }
  51         return NULL;
  52 }
  53 Constraint * getElementValueBinaryIndexConstraint(Element* This, uint64_t value) {
  54         ASTNodeType type = GETELEMENTTYPE(This);
  55         ASSERT(type == ELEMSET || type == ELEMFUNCRETURN);
  56         ElementEncoding* elemEnc = getElementEncoding(This);
  57         for(uint i=0; i<elemEnc->encArraySize; i++){
  58                 if( isinUseElement(elemEnc, i) && elemEnc->encodingArray[i]==value){
  59                         return generateBinaryConstraint(elemEnc->numVars,
  60                                 elemEnc->variables, i);
  61                 }
  62         }
  63         return NULL;
  64 }
  65
  66 void addConstraintToSATSolver(Constraint *c, IncrementalSolver* satSolver) {
  67         VectorConstraint* simplified = simplifyConstraint(c);
  68         uint size = getSizeVectorConstraint(simplified);
  69         for(uint i=0; i<size; i++) {
  70                 Constraint *simp=getVectorConstraint(simplified, i);
  71                 if (simp->type==TRUE)
  72                         continue;
  73                 ASSERT(simp->type!=FALSE);
  74                 dumpConstraint(simp, satSolver);
  75         }
  76         deleteVectorConstraint(simplified);
  77 }
  78
  79 void encodeAllSATEncoder(CSolver *csolver, SATEncoder * This) {
  80         VectorBoolean *constraints=csolver->constraints;
  81         uint size=getSizeVectorBoolean(constraints);
  82         for(uint i=0;i<size;i++) {
  83                 Boolean *constraint=getVectorBoolean(constraints, i);
  84                 Constraint* c= encodeConstraintSATEncoder(This, constraint);
  85                 printConstraint(c);
  86                 model_print("\n\n");
  87                 addConstraintToSATSolver(c, This->satSolver);
  88                 //FIXME: When do we want to delete constraints? Should we keep an array of them
  89                 // and delete them later, or it would be better to just delete them right away?
  90         }
  91 }
  92
  93 Constraint * encodeConstraintSATEncoder(SATEncoder *This, Boolean *constraint) {
  94         switch(GETBOOLEANTYPE(constraint)) {
  95         case ORDERCONST:
  96                 return encodeOrderSATEncoder(This, (BooleanOrder *) constraint);
  97         case BOOLEANVAR:
  98                 return encodeVarSATEncoder(This, (BooleanVar *) constraint);
  99         case LOGICOP:
 100                 return encodeLogicSATEncoder(This, (BooleanLogic *) constraint);
 101         case PREDICATEOP:
 102                 return encodePredicateSATEncoder(This, (BooleanPredicate *) constraint);
 103         default:
 104                 model_print("Unhandled case in encodeConstraintSATEncoder %u", GETBOOLEANTYPE(constraint));
 105                 exit(-1);
 106         }
 107 }
 108
 109 void getArrayNewVarsSATEncoder(SATEncoder* encoder, uint num, Constraint **carray) {
 110         for(uint i=0;i<num;i++)
 111                 carray[i]=getNewVarSATEncoder(encoder);
 112 }
 113
 114 Constraint * getNewVarSATEncoder(SATEncoder *This) {
 115         Constraint * var=allocVarConstraint(VAR, This->varcount);
 116         Constraint * varneg=allocVarConstraint(NOTVAR, This->varcount++);
 117         setNegConstraint(var, varneg);
 118         setNegConstraint(varneg, var);
 119         return var;
 120 }
 121
 122 Constraint * encodeVarSATEncoder(SATEncoder *This, BooleanVar * constraint) {
 123         if (constraint->var == NULL) {
 124                 constraint->var=getNewVarSATEncoder(This);
 125         }
 126         return constraint->var;
 127 }
 128
 129 Constraint * encodeLogicSATEncoder(SATEncoder *This, BooleanLogic * constraint) {
 130         Constraint * array[getSizeArrayBoolean(&constraint->inputs)];
 131         for(uint i=0;i<getSizeArrayBoolean(&constraint->inputs);i++)
 132                 array[i]=encodeConstraintSATEncoder(This, getArrayBoolean(&constraint->inputs, i));
 133
 134         switch(constraint->op) {
 135         case L_AND:
 136                 return allocArrayConstraint(AND, getSizeArrayBoolean(&constraint->inputs), array);
 137         case L_OR:
 138                 return allocArrayConstraint(OR, getSizeArrayBoolean(&constraint->inputs), array);
 139         case L_NOT:
 140                 ASSERT( getSizeArrayBoolean(&constraint->inputs)==1);
 141                 return negateConstraint(array[0]);
 142         case L_XOR: {
 143                 ASSERT( getSizeArrayBoolean(&constraint->inputs)==2);
 144                 Constraint * nleft=negateConstraint(cloneConstraint(array[0]));
 145                 Constraint * nright=negateConstraint(cloneConstraint(array[1]));
 146                 return allocConstraint(OR,
 147                                                                                                          allocConstraint(AND, array[0], nright),
 148                                                                                                          allocConstraint(AND, nleft, array[1]));
 149         }
 150         case L_IMPLIES:
 151                 ASSERT( getSizeArrayBoolean( &constraint->inputs)==2);
 152                 return allocConstraint(IMPLIES, array[0], array[1]);
 153         default:
 154                 model_print("Unhandled case in encodeLogicSATEncoder %u", constraint->op);
 155                 exit(-1);
 156         }
 157 }
 158
 159
 160 Constraint * encodeOrderSATEncoder(SATEncoder *This, BooleanOrder * constraint) {
 161         switch( constraint->order->type){
 162                 case PARTIAL:
 163                         return encodePartialOrderSATEncoder(This, constraint);
 164                 case TOTAL:
 165                         return encodeTotalOrderSATEncoder(This, constraint);
 166                 default:
 167                         ASSERT(0);
 168         }
 169         return NULL;
 170 }
 171
 172 Constraint * getPairConstraint(SATEncoder *This, HashTableBoolConst * table, OrderPair * pair) {
 173         bool negate = false;
 174         OrderPair flipped;
 175         if (pair->first > pair->second) {
 176                 negate=true;
 177                 flipped.first=pair->second;
 178                 flipped.second=pair->first;
 179                 pair = &flipped;        //FIXME: accessing a local variable from outside of the function?
 180         }
 181         Constraint * constraint;
 182         if (!containsBoolConst(table, pair)) {
 183                 constraint = getNewVarSATEncoder(This);
 184                 OrderPair * paircopy = allocOrderPair(pair->first, pair->second);
 185                 putBoolConst(table, paircopy, constraint);
 186         } else
 187                 constraint = getBoolConst(table, pair);
 188         if (negate)
 189                 return negateConstraint(constraint);
 190         else
 191                 return constraint;
 192
 193 }
 194
 195 Constraint * encodeTotalOrderSATEncoder(SATEncoder *This, BooleanOrder * boolOrder){
 196         ASSERT(boolOrder->order->type == TOTAL);
 197         if(boolOrder->order->boolsToConstraints == NULL){
 198                 initializeOrderHashTable(boolOrder->order);
 199                 return createAllTotalOrderConstraintsSATEncoder(This, boolOrder->order);
 200         }
 201         HashTableBoolConst* boolToConsts = boolOrder->order->boolsToConstraints;
 202         OrderPair pair={boolOrder->first, boolOrder->second};
 203         Constraint* constraint = getPairConstraint(This, boolToConsts, & pair);
 204         ASSERT(constraint != NULL);
 205         return constraint;
 206 }
 207
 208 Constraint* createAllTotalOrderConstraintsSATEncoder(SATEncoder* This, Order* order){
 209         ASSERT(order->type == TOTAL);
 210         VectorInt* mems = order->set->members;
 211         HashTableBoolConst* table = order->boolsToConstraints;
 212         uint size = getSizeVectorInt(mems);
 213         Constraint* constraints [size*size];
 214         uint csize =0;
 215         for(uint i=0; i<size; i++){
 216                 uint64_t valueI = getVectorInt(mems, i);
 217                 for(uint j=i+1; j<size;j++){
 218                         uint64_t valueJ = getVectorInt(mems, j);
 219                         OrderPair pairIJ = {valueI, valueJ};
 220                         Constraint* constIJ=getPairConstraint(This, table, & pairIJ);
 221                         for(uint k=j+1; k<size; k++){
 222                                 uint64_t valueK = getVectorInt(mems, k);
 223                                 OrderPair pairJK = {valueJ, valueK};
 224                                 OrderPair pairIK = {valueI, valueK};
 225                                 Constraint* constIK = getPairConstraint(This, table, & pairIK);
 226                                 Constraint* constJK = getPairConstraint(This, table, & pairJK);
 227                                 constraints[csize++] = generateTransOrderConstraintSATEncoder(This, constIJ, constJK, constIK);
 228                                 ASSERT(csize < size*size);
 229                         }
 230                 }
 231         }
 232         return allocArrayConstraint(AND, csize, constraints);
 233 }
 234
 235 Constraint* getOrderConstraint(HashTableBoolConst *table, OrderPair *pair){
 236         ASSERT(pair->first!= pair->second);
 237         Constraint* constraint= getBoolConst(table, pair);
 238         ASSERT(constraint!= NULL);
 239         if(pair->first > pair->second)
 240                 return constraint;
 241         else
 242                 return negateConstraint(constraint);
 243 }
 244
 245 Constraint * generateTransOrderConstraintSATEncoder(SATEncoder *This, Constraint *constIJ,Constraint *constJK,Constraint *constIK){
 246         //FIXME: first we should add the the constraint to the satsolver!
 247         ASSERT(constIJ!= NULL && constJK != NULL && constIK != NULL);
 248         Constraint *carray[] = {constIJ, constJK, negateConstraint(constIK)};
 249         Constraint * loop1= allocArrayConstraint(OR, 3, carray);
 250         Constraint * carray2[] = {negateConstraint(constIJ), negateConstraint(constJK), constIK};
 251         Constraint * loop2= allocArrayConstraint(OR, 3,carray2 );
 252         return allocConstraint(AND, loop1, loop2);
 253 }
 254
 255 Constraint * encodePartialOrderSATEncoder(SATEncoder *This, BooleanOrder * constraint){
 256         // FIXME: we can have this implementation for partial order. Basically,
 257         // we compute the transitivity between two order constraints specified by the client! (also can be used
 258         // when client specify sparse constraints for the total order!)
 259         ASSERT(constraint->order->type == PARTIAL);
 260 /*
 261         HashTableBoolConst* boolToConsts = boolOrder->order->boolsToConstraints;
 262         if( containsBoolConst(boolToConsts, boolOrder) ){
 263                 return getBoolConst(boolToConsts, boolOrder);
 264         } else {
 265                 Constraint* constraint = getNewVarSATEncoder(This);
 266                 putBoolConst(boolToConsts,boolOrder, constraint);
 267                 VectorBoolean* orderConstrs = &boolOrder->order->constraints;
 268                 uint size= getSizeVectorBoolean(orderConstrs);
 269                 for(uint i=0; i<size; i++){
 270                         ASSERT(GETBOOLEANTYPE( getVectorBoolean(orderConstrs, i)) == ORDERCONST );
 271                         BooleanOrder* tmp = (BooleanOrder*)getVectorBoolean(orderConstrs, i);
 272                         BooleanOrder* newBool;
 273                         Constraint* first, *second;
 274                         if(tmp->second==boolOrder->first){
 275                                 newBool = (BooleanOrder*)allocBooleanOrder(tmp->order,tmp->first,boolOrder->second);
 276                                 first = encodeTotalOrderSATEncoder(This, tmp);
 277                                 second = constraint;
 278
 279                         }else if (boolOrder->second == tmp->first){
 280                                 newBool = (BooleanOrder*)allocBooleanOrder(tmp->order,boolOrder->first,tmp->second);
 281                                 first = constraint;
 282                                 second = encodeTotalOrderSATEncoder(This, tmp);
 283                         }else
 284                                 continue;
 285                         Constraint* transConstr= encodeTotalOrderSATEncoder(This, newBool);
 286                         generateTransOrderConstraintSATEncoder(This, first, second, transConstr );
 287                 }
 288                 return constraint;
 289         }
 290 */
 291         return NULL;
 292 }
 293
 294 Constraint * encodePredicateSATEncoder(SATEncoder * This, BooleanPredicate * constraint) {
 295         switch(GETPREDICATETYPE(constraint->predicate) ){
 296                 case TABLEPRED:
 297                         return encodeTablePredicateSATEncoder(This, constraint);
 298                 case OPERATORPRED:
 299                         return encodeOperatorPredicateSATEncoder(This, constraint);
 300                 default:
 301                         ASSERT(0);
 302         }
 303         return NULL;
 304 }
 305
 306 Constraint * encodeTablePredicateSATEncoder(SATEncoder * This, BooleanPredicate * constraint){
 307         switch(constraint->encoding.type){
 308                 case ENUMERATEIMPLICATIONS:
 309                 case ENUMERATEIMPLICATIONSNEGATE:
 310                         return encodeEnumTablePredicateSATEncoder(This, constraint);
 311                 case CIRCUIT:
 312                         ASSERT(0);
 313                         break;
 314                 default:
 315                         ASSERT(0);
 316         }
 317         return NULL;
 318 }
 319
 320 Constraint * encodeEnumTablePredicateSATEncoder(SATEncoder * This, BooleanPredicate * constraint){
 321         VectorTableEntry* entries = &(((PredicateTable*)constraint->predicate)->table->entries);
 322         FunctionEncodingType encType = constraint->encoding.type;
 323         uint size = getSizeVectorTableEntry(entries);
 324         Constraint* constraints[size];
 325         for(uint i=0; i<size; i++){
 326                 TableEntry* entry = getVectorTableEntry(entries, i);
 327                 if(encType==ENUMERATEIMPLICATIONS && entry->output!= true)
 328                         continue;
 329                 else if(encType==ENUMERATEIMPLICATIONSNEGATE && entry->output !=false)
 330                         continue;
 331                 ArrayElement* inputs = &constraint->inputs;
 332                 uint inputNum =getSizeArrayElement(inputs);
 333                 Constraint* carray[inputNum];
 334                 for(uint j=0; j<inputNum; j++){
 335                         Element* el = getArrayElement(inputs, j);
 336                         Constraint* tmpc = getElementValueConstraint(This,el, entry->inputs[j]);
 337                         ASSERT(tmpc!= NULL);
 338                         if( GETELEMENTTYPE(el) == ELEMFUNCRETURN){
 339                                 Constraint* func =encodeFunctionElementSATEncoder(This, (ElementFunction*) el);
 340                                 ASSERT(func!=NULL);
 341                                 carray[j] = allocConstraint(AND, func, tmpc);
 342                         } else {
 343                                 carray[j] = tmpc;
 344                         }
 345                         ASSERT(carray[j]!= NULL);
 346                 }
 347                 constraints[i]=allocArrayConstraint(AND, inputNum, carray);
 348         }
 349         Constraint* result= allocArrayConstraint(OR, size, constraints);
 350         //FIXME: if it didn't match with any entry
 351         return encType==ENUMERATEIMPLICATIONS? result: negateConstraint(result);
 352 }
 353
 354 Constraint * encodeOperatorPredicateSATEncoder(SATEncoder * This, BooleanPredicate * constraint){
 355         switch(constraint->encoding.type){
 356                 case ENUMERATEIMPLICATIONS:
 357                         return encodeEnumOperatorPredicateSATEncoder(This, constraint);
 358                 case CIRCUIT:
 359                         ASSERT(0);
 360                         break;
 361                 default:
 362                         ASSERT(0);
 363         }
 364         return NULL;
 365 }
 366
 367 Constraint * encodeEnumOperatorPredicateSATEncoder(SATEncoder * This, BooleanPredicate * constraint){
 368         ASSERT(GETPREDICATETYPE(constraint->predicate)==OPERATORPRED);
 369         PredicateOperator* predicate = (PredicateOperator*)constraint->predicate;
 370         ASSERT(predicate->op == EQUALS); //For now, we just only support equals
 371         //getting maximum size of in common elements between two sets!
 372         uint size=getSizeVectorInt( getArraySet( &predicate->domains, 0)->members);
 373         uint64_t commonElements [size];
 374         getEqualitySetIntersection(predicate, &size, commonElements);
 375         Constraint*  carray[size];
 376         Element* elem1 = getArrayElement( &constraint->inputs, 0);
 377         Constraint *elemc1 = NULL, *elemc2 = NULL;
 378         if( GETELEMENTTYPE(elem1) == ELEMFUNCRETURN)
 379                 elemc1 = encodeFunctionElementSATEncoder(This, (ElementFunction*) elem1);
 380         Element* elem2 = getArrayElement( &constraint->inputs, 1);
 381         if( GETELEMENTTYPE(elem2) == ELEMFUNCRETURN)
 382                 elemc2 = encodeFunctionElementSATEncoder(This, (ElementFunction*) elem2);
 383         for(uint i=0; i<size; i++){
 384                 Constraint* arg1 = getElementValueConstraint(This, elem1, commonElements[i]);
 385                 ASSERT(arg1!=NULL);
 386                 Constraint* arg2 = getElementValueConstraint(This, elem2, commonElements[i]);
 387                 ASSERT(arg2 != NULL);
 388                 carray[i] =  allocConstraint(AND, arg1, arg2);
 389         }
 390         //FIXME: the case when there is no intersection ....
 391         Constraint* result = allocArrayConstraint(OR, size, carray);
 392         ASSERT(result!= NULL);
 393         if(elemc1!= NULL)
 394                 result = allocConstraint(AND, result, elemc1);
 395         if(elemc2 != NULL)
 396                 result = allocConstraint (AND, result, elemc2);
 397         return result;
 398 }
 399
 400 Constraint* encodeFunctionElementSATEncoder(SATEncoder* encoder, ElementFunction *This){
 401         switch(GETFUNCTIONTYPE(This->function)){
 402                 case TABLEFUNC:
 403                         return encodeTableElementFunctionSATEncoder(encoder, This);
 404                 case OPERATORFUNC:
 405                         return encodeOperatorElementFunctionSATEncoder(encoder, This);
 406                 default:
 407                         ASSERT(0);
 408         }
 409         return NULL;
 410 }
 411
 412 Constraint* encodeTableElementFunctionSATEncoder(SATEncoder* encoder, ElementFunction* This){
 413         switch(getElementFunctionEncoding(This)->type){
 414                 case ENUMERATEIMPLICATIONS:
 415                         return encodeEnumTableElemFunctionSATEncoder(encoder, This);
 416                         break;
 417                 case CIRCUIT:
 418                         ASSERT(0);
 419                         break;
 420                 default:
 421                         ASSERT(0);
 422         }
 423         return NULL;
 424 }
 425
 426 Constraint* encodeOperatorElementFunctionSATEncoder(SATEncoder* encoder, ElementFunction* This){
 427         ASSERT(GETFUNCTIONTYPE(This->function) == OPERATORFUNC);
 428         ASSERT(getSizeArrayElement(&This->inputs)==2 );
 429         ElementEncoding* elem1 = getElementEncoding( getArrayElement(&This->inputs,0) );
 430         ElementEncoding* elem2 = getElementEncoding( getArrayElement(&This->inputs,1) );
 431         Constraint* carray[elem1->encArraySize*elem2->encArraySize];
 432         uint size=0;
 433         Constraint* overFlowConstraint = ((BooleanVar*) This->overflowstatus)->var;
 434         for(uint i=0; i<elem1->encArraySize; i++){
 435                 if(isinUseElement(elem1, i)){
 436                         for( uint j=0; j<elem2->encArraySize; j++){
 437                                 if(isinUseElement(elem2, j)){
 438                                         bool isInRange = false;
 439                                         uint64_t result= applyFunctionOperator((FunctionOperator*)This->function,elem1->encodingArray[i],
 440                                                 elem2->encodingArray[j], &isInRange);
 441                                         //FIXME: instead of getElementValueConstraint, it might be useful to have another function
 442                                         // that doesn't iterate over encodingArray and treats more efficient ...
 443                                         Constraint* valConstrIn1 = getElementValueConstraint(encoder, elem1->element, elem1->encodingArray[i]);
 444                                         ASSERT(valConstrIn1 != NULL);
 445                                         Constraint* valConstrIn2 = getElementValueConstraint(encoder, elem2->element, elem2->encodingArray[j]);
 446                                         ASSERT(valConstrIn2 != NULL);
 447                                         Constraint* valConstrOut = getElementValueConstraint(encoder, (Element*) This, result);
 448                                         if(valConstrOut == NULL)
 449                                                 continue; //FIXME:Should talk to brian about it!
 450                                         Constraint* OpConstraint = allocConstraint(IMPLIES,
 451                                                 allocConstraint(AND, valConstrIn1, valConstrIn2) , valConstrOut);
 452                                         switch( ((FunctionOperator*)This->function)->overflowbehavior ){
 453                                                 case IGNORE:
 454                                                         if(isInRange){
 455                                                                 carray[size++] = OpConstraint;
 456                                                         }
 457                                                         break;
 458                                                 case WRAPAROUND:
 459                                                         carray[size++] = OpConstraint;
 460                                                         break;
 461                                                 case FLAGFORCESOVERFLOW:
 462                                                         if(isInRange){
 463                                                                 Constraint* const1 = allocConstraint(IMPLIES,
 464                                                                         allocConstraint(AND, valConstrIn1, valConstrIn2),
 465                                                                         negateConstraint(overFlowConstraint));
 466                                                                 carray[size++] = allocConstraint(AND, const1, OpConstraint);
 467                                                         }
 468                                                         break;
 469                                                 case OVERFLOWSETSFLAG:
 470                                                         if(isInRange){
 471                                                                 carray[size++] = OpConstraint;
 472                                                         } else{
 473                                                                 carray[size++] = allocConstraint(IMPLIES,
 474                                                                         allocConstraint(AND, valConstrIn1, valConstrIn2),
 475                                                                         overFlowConstraint);
 476                                                         }
 477                                                         break;
 478                                                 case FLAGIFFOVERFLOW:
 479                                                         if(isInRange){
 480                                                                 Constraint* const1 = allocConstraint(IMPLIES,
 481                                                                         allocConstraint(AND, valConstrIn1, valConstrIn2),
 482                                                                         negateConstraint(overFlowConstraint));
 483                                                                 carray[size++] = allocConstraint(AND, const1, OpConstraint);
 484                                                         }else{
 485                                                                 carray[size++] = allocConstraint(IMPLIES,
 486                                                                         allocConstraint(AND, valConstrIn1, valConstrIn2),
 487                                                                         overFlowConstraint);
 488                                                         }
 489                                                         break;
 490                                                 case NOOVERFLOW:
 491                                                         if(!isInRange){
 492                                                                 ASSERT(0);
 493                                                         }
 494                                                         carray[size++] = OpConstraint;
 495                                                         break;
 496                                                 default:
 497                                                         ASSERT(0);
 498                                         }
 499
 500                                 }
 501                         }
 502                 }
 503         }
 504         return allocArrayConstraint(AND, size, carray);
 505 }
 506
 507 Constraint* encodeEnumTableElemFunctionSATEncoder(SATEncoder* encoder, ElementFunction* This){
 508         ASSERT(GETFUNCTIONTYPE(This->function)==TABLEFUNC);
 509         ArrayElement* elements= &This->inputs;
 510         Table* table = ((FunctionTable*) (This->function))->table;
 511         uint size = getSizeVectorTableEntry(&table->entries);
 512         Constraint* constraints[size]; //FIXME: should add a space for the case that didn't match any entries
 513         for(uint i=0; i<size; i++){
 514                 TableEntry* entry = getVectorTableEntry(&table->entries, i);
 515                 uint inputNum =getSizeArrayElement(elements);
 516                 Constraint* carray[inputNum];
 517                 for(uint j=0; j<inputNum; j++){
 518                         Element* el= getArrayElement(elements, j);
 519                         carray[j] = getElementValueConstraint(encoder, el, entry->inputs[j]);
 520                         ASSERT(carray[j]!= NULL);
 521                 }
 522                 Constraint* output = getElementValueConstraint(encoder, (Element*)This, entry->output);
 523                 ASSERT(output!= NULL);
 524                 Constraint* row= allocConstraint(IMPLIES, allocArrayConstraint(AND, inputNum, carray), output);
 525                 constraints[i]=row;
 526         }
 527         Constraint* result = allocArrayConstraint(OR, size, constraints);
 528         return result;
 529 }