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