src/ASTAnalyses/Polarity/polarityassignment.cc

   1 #include "polarityassignment.h"
   2 #include "csolver.h"
   3
   4 void computePolarities(CSolver *This) {
   5         SetIteratorBooleanEdge *iterator = This->getConstraints();
   6         while (iterator->hasNext()) {
   7                 BooleanEdge boolean = iterator->next();
   8                 Boolean *b = boolean.getBoolean();
   9                 bool isNegated = boolean.isNegated();
  10                 computePolarity(b, isNegated ? P_FALSE : P_TRUE);
  11         }
  12         delete iterator;
  13 }
  14
  15 bool updatePolarity(Boolean *This, Polarity polarity) {
  16         Polarity oldpolarity = This->polarity;
  17         Polarity newpolarity = (Polarity) (This->polarity | polarity);
  18         This->polarity = newpolarity;
  19         return newpolarity != oldpolarity;
  20 }
  21
  22 void updateMustValue(Boolean *This, BooleanValue value) {
  23         This->boolVal = (BooleanValue) (This->boolVal | value);
  24 }
  25
  26 void computePolarity(Boolean *This, Polarity polarity) {
  27         if (updatePolarity(This, polarity)) {
  28                 switch (This->type) {
  29                 case BOOLEANVAR:
  30                 case ORDERCONST:
  31                         return;
  32                 case PREDICATEOP:
  33                         return computePredicatePolarity((BooleanPredicate *)This);
  34                 case LOGICOP:
  35                         return computeLogicOpPolarity((BooleanLogic *)This);
  36                 default:
  37                         ASSERT(0);
  38                 }
  39         }
  40 }
  41
  42 void computePredicatePolarity(BooleanPredicate *This) {
  43         if (This->undefStatus) {
  44                 computePolarity(This->undefStatus.getBoolean(), P_BOTHTRUEFALSE);
  45         }
  46 }
  47
  48 void computeLogicOpPolarity(BooleanLogic *This) {
  49         Polarity child = computeLogicOpPolarityChildren(This);
  50         uint size = This->inputs.getSize();
  51         for (uint i = 0; i < size; i++) {
  52                 BooleanEdge b = This->inputs.get(i);
  53                 computePolarity(b.getBoolean(), b.isNegated() ? negatePolarity(child) : child);
  54         }
  55 }
  56
  57 Polarity negatePolarity(Polarity This) {
  58         switch (This) {
  59         case P_UNDEFINED:
  60         case P_BOTHTRUEFALSE:
  61                 return This;
  62         case P_TRUE:
  63                 return P_FALSE;
  64         case P_FALSE:
  65                 return P_TRUE;
  66         default:
  67                 ASSERT(0);
  68         }
  69 }
  70
  71 BooleanValue negateBooleanValue(BooleanValue This) {
  72         switch (This) {
  73         case BV_UNDEFINED:
  74         case BV_UNSAT:
  75                 return This;
  76         case BV_MUSTBETRUE:
  77                 return BV_MUSTBEFALSE;
  78         case BV_MUSTBEFALSE:
  79                 return BV_MUSTBETRUE;
  80         default:
  81                 ASSERT(0);
  82         }
  83 }
  84
  85 Polarity computeLogicOpPolarityChildren(BooleanLogic *This) {
  86         switch (This->op) {
  87         case SATC_AND: {
  88                 return This->polarity;
  89         }
  90         case SATC_IFF: {
  91                 return P_BOTHTRUEFALSE;
  92         }
  93         default:
  94                 ASSERT(0);
  95         }
  96 }