Example #1
0
  @Override
  public boolean isNotNull(DfaValue dfaVar) {
    if (dfaVar instanceof DfaConstValue) return ((DfaConstValue) dfaVar).getValue() != null;
    if (dfaVar instanceof DfaBoxedValue) return true;
    if (dfaVar instanceof DfaTypeValue) return ((DfaTypeValue) dfaVar).isNotNull();
    if (dfaVar instanceof DfaVariableValue) {
      if (getVariableState((DfaVariableValue) dfaVar).isNotNull()) return true;

      DfaConstValue constantValue = getConstantValue((DfaVariableValue) dfaVar);
      if (constantValue != null && constantValue.getValue() != null) return true;
    }

    DfaConstValue dfaNull = myFactory.getConstFactory().getNull();
    int c1Index = getEqClassIndex(dfaVar);
    int c2Index = getEqClassIndex(dfaNull);
    if (c1Index < 0 || c2Index < 0) {
      return false;
    }

    long[] pairs = myDistinctClasses.toArray();
    for (long pair : pairs) {
      if (c1Index == low(pair) && c2Index == high(pair)
          || c1Index == high(pair) && c2Index == low(pair)) {
        return true;
      }
    }

    return false;
  }
Example #2
0
  LinkedHashSet<UnorderedPair<EqClass>> getDistinctClassPairs() {
    if (myCachedDistinctClassPairs != null) return myCachedDistinctClassPairs;

    LinkedHashSet<UnorderedPair<EqClass>> result = ContainerUtil.newLinkedHashSet();
    for (long encodedPair : myDistinctClasses.toArray()) {
      result.add(
          new UnorderedPair<>(
              myEqClasses.get(low(encodedPair)), myEqClasses.get(high(encodedPair))));
    }
    return myCachedDistinctClassPairs = result;
  }
Example #3
0
  private boolean applyRelation(
      @NotNull final DfaValue dfaLeft, @NotNull final DfaValue dfaRight, boolean isNegated) {
    if (isUnknownState(dfaLeft) || isUnknownState(dfaRight)) {
      return true;
    }

    // DfaConstValue || DfaVariableValue
    Integer c1Index = getOrCreateEqClassIndex(dfaLeft);
    Integer c2Index = getOrCreateEqClassIndex(dfaRight);
    if (c1Index == null || c2Index == null) {
      return true;
    }

    if (!isNegated) { // Equals
      if (c1Index.equals(c2Index) || areCompatibleConstants(c1Index, c2Index)) return true;
      if (!uniteClasses(c1Index, c2Index)) return false;

      for (long encodedPair : myDistinctClasses.toArray()) {
        EqClass c1 = myEqClasses.get(low(encodedPair));
        EqClass c2 = myEqClasses.get(high(encodedPair));
        DfaConstValue const1 = (DfaConstValue) c1.findConstant(false);
        DfaConstValue const2 = (DfaConstValue) c2.findConstant(false);
        if (const1 != null
            && const2 != null
            && !preserveConstantDistinction(const1.getValue(), const2.getValue())) {
          myDistinctClasses.remove(encodedPair);
        }
      }
      myCachedDistinctClassPairs = null;
      myCachedNonTrivialEqClasses = null;
      myCachedHash = null;
    } else { // Not Equals
      if (c1Index.equals(c2Index) || areCompatibleConstants(c1Index, c2Index)) return false;
      if (isNull(dfaLeft) && isPrimitive(dfaRight) || isNull(dfaRight) && isPrimitive(dfaLeft))
        return true;
      makeClassesDistinct(c1Index, c2Index);
      myCachedDistinctClassPairs = null;
      myCachedHash = null;
    }

    return true;
  }
Example #4
0
  private boolean uniteClasses(int c1Index, int c2Index) {
    EqClass c1 = myEqClasses.get(c1Index);
    EqClass c2 = myEqClasses.get(c2Index);

    Set<DfaVariableValue> vars = ContainerUtil.newTroveSet();
    Set<DfaVariableValue> negatedVars = ContainerUtil.newTroveSet();
    int[] cs = new int[c1.size() + c2.size()];
    c1.set(0, cs, 0, c1.size());
    c2.set(0, cs, c1.size(), c2.size());

    int nConst = 0;
    for (int c : cs) {
      DfaValue dfaValue = unwrap(myFactory.getValue(c));
      if (dfaValue instanceof DfaConstValue) nConst++;
      if (dfaValue instanceof DfaVariableValue) {
        DfaVariableValue variableValue = (DfaVariableValue) dfaValue;
        if (variableValue.isNegated()) {
          negatedVars.add(variableValue.createNegated());
        } else {
          vars.add(variableValue);
        }
      }
      if (nConst > 1) return false;
    }
    if (ContainerUtil.intersects(vars, negatedVars)) return false;

    TLongArrayList c2Pairs = new TLongArrayList();
    long[] distincts = myDistinctClasses.toArray();
    for (long distinct : distincts) {
      int pc1 = low(distinct);
      int pc2 = high(distinct);
      boolean addedToC1 = false;

      if (pc1 == c1Index || pc2 == c1Index) {
        addedToC1 = true;
      }

      if (pc1 == c2Index || pc2 == c2Index) {
        if (addedToC1) return false;
        c2Pairs.add(distinct);
      }
    }

    EqClass newClass = new EqClass(c1);

    myEqClasses.set(c1Index, newClass);
    for (int i = 0; i < c2.size(); i++) {
      int c = c2.get(i);
      newClass.add(c);
      removeFromMap(c, c2Index);
      addToMap(c, c1Index);
    }

    for (int i = 0; i < c2Pairs.size(); i++) {
      long c = c2Pairs.get(i);
      myDistinctClasses.remove(c);
      myDistinctClasses.add(createPair(c1Index, low(c) == c2Index ? high(c) : low(c)));
    }
    myEqClasses.set(c2Index, null);

    return true;
  }